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Jinan rail Transit Line 4 has the largest building volume The main structure of Xingcun station was successfully capped Recently, the main structure of Xingcun Station, Section 11 of the first phase of the Jinan Rail Transit Line 4 project undertaken by Shandong Road and Bridge Group was successfully capped, completing the node target 3 months ahead of the planned construction period. Xingcun Station is the 29th station of Jinan Rail Transit Line 4, located in Licheng District, Jinan City, south of the intersection of Shidong Road and Tangye West Road. The station is a transfer station for Line 4 and Line 8 double island four lines, with a total length of 378.5m, an effective platform length of 140m, a standard section width of 38.3~43.5m, and the widest position of the end well of 46.9m, a total of 2 sets of wind pavilion, 5 entrances and exits. It is the station with the widest pit width and the largest building volume of Jinan Rail Transit Line 4. The top of the main structure of Xingcun Station marks the interconnection of Jinan Metro Line 2, Line 4 and Line 8, which provides a strong guarantee for the smooth opening of Line 4 and Line 8, and also ushered in the first "opening red" of Shandong Road and Bridge Group in the field of subway construction, opening a new chapter of the Group in the development of urban rail transit.

Metal mounting plate features: 1. Good durability: The metal electrical appliance mounting plate is made of metal materials and has good durability and corrosion resistance. 2.2. Strong load-bearing capacity: The metal electrical appliance mounting plate can bear a large weight and is suitable for installing various electrical equipment. 3.3. Flexible and convenient installation: The metal electrical appliance mounting plate has good installation flexibility and convenience, and can be cut, bent, and perforated as needed. 4. Highly standardized design: The design and production of metal electrical installation panels usually comply with certain standards and specifications, ensuring the safety and stability of the equipment. Metal mounting plate classification 1. Galvanized steel plate mounting plate: Made of galvanized steel plate, the surface has good corrosion resistance and durability. 2.2. Stainless steel mounting plate: Made of stainless steel, the surface is not easy to rust and has high corrosion resistance. 3.3. Aluminum alloy mounting plate: made of aluminum alloy material, light weight, high strength, good toughness, good thermal conductivity, but poor corrosion resistance installation method: 1. Select the appropriate installation location: According to the needs of the electrical equipment, select the appropriate installation location and mark it. 2.2. Pre-processing the installation board: cutting, bending, perforating, etc. as needed. 3.3. Fix the mounting plate: Fix the mounting plate in the appropriate position with appropriate fixings such as expansion bolts. 4.4. Install electrical equipment: Install wires, circuit breakers, switches and other equipment on the installation plate as needed. Precautions when using metal mounting plates 1. When selecting a mounting plate, select the appropriate material and size according to the needs of the equipment and the actual situation. 2.2. When installing, confirm whether the size, hole spacing, etc. of the equipment and the mounting plate match. 3.3. When fixing the mounting plate, pay attention to the selection and strength of the fixing parts to ensure the safety and stability of the equipment. 4.4. When installing electrical equipment, wiring must be done correctly as required to ensure the normal operation of the electrical equipment.

On January 11, the Century Park station of the first phase of Shijiazhuang Metro Line 4 passed the acceptance of the construction conditions, marking that the station has fully entered the main construction stage. According to previous reports, the first phase of Shijiazhuang rail transit Line 4 is about 22.43 kilometers long, with a total of 20 stations. The line runs from Yucun South Road station to Dongyuan East Road station, along Huiming Road, HSBC Road, Yuxiang Street, South Second Ring Road, Jianhua Street, Mianhe River and Gao Ying Street. The first phase of Line 4 consists of 6 transfer stations, transferring to planned Line 5 at Hongqi South Street Station, transferring to Operation Line 2 at Liucun Station of Cangfeng Road, transferring to Operation Line 3 at Nanwang Station, transferring to planned Line 6 at Jianhuanan Street Station, transferring to Operation Line 1 at Beisong Station, transferring to planned Line 5 at Guanghua Road Station.

The role of the junction box: In home decoration, the junction box is one of the electrical accessories, because the wires used for decoration pass through the wire tubes, and wiring is used at the joints of the wires (such as the lines are relatively long, or the wire tubes need to be turned). The box is used as a transition, the wire tube is connected to the junction box, and the wires in the wire tube are connected in the junction box to protect the wires and connect the wires. Classification of junction boxes: 1. Plug-in type junction box. Easy to disassemble and assemble, suitable for use in dry and dusty places. 2. Ordinary junction box. The structure is simple and can be used in non-corrosive places. 3. Waterproof junction box. It has good waterproof performance and is suitable for sites with water spray. 4. Explosion-proof junction box. Beautiful appearance, suitable for IIA, IIB and IIC level explosive environments. 5. Splash-proof junction box. It has good splash-proof performance and is suitable for areas with water vapor splash or humid areas. Selection of junction box: 1. Determine the junction box model, name, logo, etc., and try to choose a big brand junction box, so that the quality and other aspects are more guaranteed. 2. Check whether the contact between the junction box and the network cable is even, whether there is an obvious gap, whether the connection is firm, and whether there is looseness. If the contact is poor, it will cause signal strength. Also pay attention to whether the socket socket is flush and whether the edges are No bulges, swelling or other problems. 3. The junction box must have a protective door, and the socket must have a certain width from the edge of the panel to ensure that a single pole of the plug cannot be inserted. Generally, the panel of a good quality junction box has a uniform color, good surface gloss, and no dents and other problems. 4. Pay attention to whether the panel and bottom plate of the junction box are firm and not loose, and whether the panel and bottom plate can be easily disassembled without tightness or difficulty in disassembly and assembly.

China News Sichuan news January 7 (reporter Liu Zhongjun) At present, Chengdu is taking the optimization and adjustment of urban spatial structure, industrial structure, transportation structure and energy structure as an important starting point to vigorously promote the high-quality sustainable development of megacities. At the same time, focusing on the major strategies of serving the construction of Shuangcheng economic circle in Chengdu-Chongqing area and the urban development of Chengdemeizi, we actively promote the "four-network integration" of trunk railway, intercity railway, urban (suburban) railway and urban rail transit, and promote the construction of a multi-level rail network integration and interconnection system. To promote the construction of the fourth phase of Chengdu rail transit and the construction of 302 kilometers of 10 lines of urban (suburban) railway. At the same time, vigorously promote the construction of the "smart city rail" demonstration project, carry out the application of new technologies such as energy saving and consumption reduction, vibration and noise reduction, orderly promote key projects such as green lines, shine the "Civilization 365" national transportation industry model brand, and create all-age friendly facilities such as high-low ticket booths, children's wash basins, and maternal and child rooms on the new lines. In Tianfu Square station and other stations to build a respect for the elderly service area, child friendly stations; Enrich and improve the passenger guide interface, and launch two-dimensional code day tickets and other services. Do excellent and multi-standard transportation connection, and constantly accelerate the efficient connection and convenient transfer with railway, airport, bus and other transportation hubs; Promote the connectivity of QR code with Qingdao, Nanning, Changsha and other cities, so that "Chengdu Metro and life" become the "best solution" and "necessary option" of park city lifestyle. We will push forward the construction of 24 TOD projects, including the TOD of Sichuan Normal University Station, at full speed, and strive to start 1.3 million square meters of new construction, and build no less than 4,500 units of affordable rental housing. High-level promotion of "Vientiane Tiandi", China Sports City, Courtyard Hotel, Kimpton Hotel, intercontinental Hotel, Hilton Hotel and other formats, high standards of opening and operating Shuangfengqiao station Sam's Club, Erjiangsi Station business, high-level appearance of Shuangfengqiao Station "future community", accelerate the demonstration effect of TOD scene, for the park city construction and future community to provide track samples. Further enrich and optimize the "subway commuting scene", promote the construction of commercial demonstration scenes such as Cui Jiadian "Liningli", Xipu Station Life Market, and "Good Life station", the "Good Morning Panda" breakfast project, TOD community canteen and other track happy life, and integrate the development of diversified business formats such as commercial cabins and smart stations; Promote the integration and innovation of rail life services, upgrade the file, launch the rail smart life service platform, realize the "online purchase" of citizens' consumption, the interconnection of ride rights and consumer rights, etc., and "one-stop" meet the life needs of citizens during commuting. In addition, relying on Chengdu's ultra-large scale rail network resources and the development advantages of the whole industrial chain, we will strengthen cooperation with well-known domestic universities and industry leading enterprises such as Southwest Jiaotong University and CRRC, and upgrade the 2025 intelligent automatic driving test platform into a proof of concept center with industry demonstration effect. Promote the research of industrial cutting-edge technologies such as "smart energy system of subway line network" and "vibration and noise reduction technology of municipal railway system", promote the construction of world-class rail transit industrial cluster with Chongqing to go deep and solid, and comprehensively enhance the leading power of rail transit industry "Chengdu Research and Chengdu Made"

Concept: Safety hook (carabiner), also called "main lock", is the most commonly used connection tool for connecting ropes, webbings, anchor points, equipment, etc. Safety shackles must have a locking function. The locking function is divided into two categories: manual locking and automatic locking. The hand turn lock is suitable for use in most environments, but it must be locked immediately after connection, otherwise an accident may occur due to inadvertent equipment collision causing the lock door to open during operation. The unlocked shackle is just like the gate in the open state, and its pulling force (breaking load) is much lower than the locked state. There are two types: ordinary type (rotating type) and spring hook (self-locking type). There are many shapes such as "D" (rescue, military) and "8" shape (engineering, construction). structure type: (1) "8" shaped safety hook. The opening and closing mechanism is a spring tongue automatic return type, and the lock arm is equipped with a self-locking latch composed of a safety pin, a compression spring and a wrench. When opening the hook, lift the wrench with your fingers to disengage the safety pin, and press the lock arm downward to open the lock arm. If the lock arm is released, the lock arm will automatically reset under the elastic force of the return spring. While the self-locking latch closes the hook mouth through the outward elastic force of the opening and closing mechanism, the compression spring will tighten the safety pin and lock the lock arm. . (2) The "D"-shaped safety hook is composed of two parts: the hook body and the lock arm. The opening and closing mechanism is a spring tongue automatic return type. The lock arm part has two safety structure designs: torsion self-locking and threaded hand lock. The self-locking structure lock The arm is equipped with a rotating compression spring, and the arm lock sleeve can automatically reset and lock. There are threads on the lock arm of the hand lock structure. The rotating lock arm sleeve can open and lock the safety hook. Material: The material of the safety hook is usually made of stainless steel, alloy steel or aluminum alloy. Steel safety hooks are harder and heavier and are suitable for connecting anchor points or coming into contact with sharp metal equipment, such as safety slings and descenders. The breaking load of aluminum alloy hooks is not inferior to that of steel products. Aluminum safety hooks are relatively light in weight and are suitable for connecting various personal protective equipment and carrying multiple spares with you. However, aluminum alloy is less resistant to cutting, so avoid hooking it with other sharp metals when using it. Inspection and maintenance: The shape of the safety hook should be checked frequently. If there is deformation or cuts, it should be discarded immediately and no longer used. If there is sand or iron filings intruding into the lock teeth, it should be cleaned immediately. Alloy steel safety hooks should be maintained with anti-rust agents and stored in special containers after use. If the safety hook accidentally falls from a height (more than 2m) to a hard ground, even if its appearance is not damaged, its internal alloy components may be seriously damaged and should be discarded and avoided from being used again.

On the New Year's Day of operation on December 31, 2023, Lanzhou rail transit once again ushered in the hot scene of "people following the crowd", and the daily passenger flow of the line network operation exceeded the 600,000 person-times mark, reaching 641,200 person-times, and the daily passenger flow intensity reached 19,200 person-times/km, once again refreshing the daily passenger flow record. Line 1 had 523,900 passengers on the same day, Line 2 had 117,300 passengers on the same day, and 66,600 passengers were transferred (Line 1 to Line 2 was transferred 32,800 people, and Line 2 to Line 1 was transferred 33,800 people). On the same day, the top three stations of Lanzhou Metro Line 1 in terms of passenger flow were: Cross Station of West Railway Station, Xiguan Station and Matan Station; The top three stations in terms of passenger flow of Lanzhou Metro Line 2 are Wulipu Station, Dongfang Red Square Station and Yanbai Bridge Station. In view of the New Year's Day holiday and New Year's day passenger flow characteristics, Lanzhou Railway Company deployed in advance, scientifically organized, laid out a train operation diagram that is in line with the actual situation, combined with major holiday passenger flow characteristics and real-time passenger flow changes, Lanzhou rail transit network operation time extended for 1 hour for three consecutive days from December 29, 2023 to December 31, 2023. Organize the spare train line in time, adjust the running interval reasonably, and further improve the line capacity. At the same time, according to the "Station Passenger flow Organization Plan" and the arrangement of cultural and folk customs activities during the New Year's Day holiday in Lanzhou City, the stations of the line network focus on timely carrying out passenger flow organization operations before and after New Year's Eve, arranging employees with outstanding business ability to serve as important duty personnel, and increasing station service personnel at the entrances, security checkpoints and exit gates of stations prone to passenger flow congestion. Strengthen the passenger flow organization at the station site, guide passengers to queue through the gate in an orderly manner, disperse the doors to wait for the train, and make every effort to ensure the safe and orderly travel of passengers. In view of the actual situation of operation and service during important festivals, Lanzhou Railway Company organizes the maintenance department of network facilities and equipment to find out hidden safety hazards in advance, rectify the problems found as soon as possible, and implement targeted preventive replacement of weak, vulnerable and consumable parts of facilities and equipment. In response to emergencies during operation, the maintenance department of facilities and equipment uniformly strengthens the presence of centralized stations of facilities and equipment. Make sure problems are dealt with as soon as they are discovered. That night, under the rising intensity of passenger flow, the Municipal Party Committee and the municipal government attached great importance to the mass transit evacuation organization, in the coordination and cooperation of the Municipal Transportation Commission and public security and other departments, the city rail company successfully completed the transportation task of the day, Lanzhou rail transit operation work as a whole stable, safe and orderly.

Advantages: First, the double tube clamp has high precision. The double pipe clamp uses two clamping screws so that the clamping parts can be clamped evenly. This enables the fixture to achieve higher clamping accuracy, ensuring positional and dimensional accuracy of the workpiece. For some processing techniques, such as CNC machine tool processing, parts assembly, etc., the double-tube fixture can provide better accuracy guarantee. Secondly, the double pipe clamp has a large clamping force. The double pipe clamp is reasonably designed and can provide greater clamping force through the dual clamping effect of the two clamping screws. The clamp can hold the workpiece stably and avoid displacement and deformation of the workpiece. This is very advantageous for processing tasks with large workpieces, complex shapes, and high material hardness. Third, the double pipe clamp has good adaptability. The double tube clamp has a flexible design and can be adjusted according to different workpiece shapes and sizes. The clamp is equipped with an adjustable clamping screw that can be adjusted according to the needs of the workpiece and accommodates workpieces of various sizes and shapes. This allows the double-tube fixture to meet the needs of different workpiece processing and improve work efficiency and flexibility. Fourth, the double tube clamp has lower cost. Compared with other clamps, the manufacturing cost of double tube clamps is relatively low. Its structure is simple, the manufacturing process is relatively simple, and it can be manufactured with less materials and parts. This significantly reduces the manufacturing cost of the fixture. At the same time, the double tube clamp can provide higher clamping force and precision, reduce workpiece loss and scrap rate during processing, and further reduce costs. Fifth, the double pipe clamp has high safety. The double tube clamp is equipped with reliable clamping screws and fixing mechanisms, which can clamp the workpiece stably. Workers can work more safely during operation, reducing the risk of injury accidents due to fixture failure. At the same time, the double pipe clamp can apply force evenly during the clamping process, avoiding damage and deformation of the workpiece, further improving work safety. Double tube clamps are easy to maintain and maintain. The structure of the double pipe clamp is relatively simple, without complex parts and mechanical structures. This makes maintenance and upkeep of the fixture simpler. Just check the working status of the screw and fixing mechanism of the clamp regularly, and lubricate and clean them in time. This reduces fixture maintenance costs and man-hours, increasing service life and economic benefits.

Yesterday, the second phase of Metro Line 8 was officially opened for operation, and the dream of citizens and tourists taking the subway to see the sea has become a reality. Photo by Liu Yujie, Shenzhen Special Zone Daily Shenzhen News Network, December 28, 2023 (Shenzhen Special Zone Daily reporter Xu Xingdong) On the morning of December 27, Shenzhen held the opening of the second phase of rail transit Line 8. Mayor Qin Weizhong attended the event and announced the opening. As an important traffic artery of Shenzhen's "East strategy", the second phase of Line 8 is connected to the existing Line 2 and 8 Yantian Road station, and the new Hong Anwei Station, Yantian Xu Station, Dameisha Station and Xiameisha Station, with a total length of 8.01 km and a design speed of 80 km per hour. The cultural tourism resources along the second phase of Line 8 are rich, passing by the Yantian seaside plank Road, Meishawan Park, Dameisha, Xiaomeisha and other coastal tourist attractions. The station design adopts "one station and one scene" to reflect the characteristics of Yantian mountains and sea. After the opening of the line, the operation of Line 2 will shorten the travel time between Meisha area and Luohu, Futian, Nanshan and other central urban areas, further activate the new vitality of cultural tourism economic development in Yantian District, enhance the level of regional development, and accelerate the coordinated and balanced integrated development of the whole city. With the opening of the second phase of Line 8, the operating mileage of Shenzhen urban rail transit has reached 567.1 kilometers, and the radiation capacity, accessibility and convenience of rail transit have been further enhanced. Next, Shenzhen will focus on improving the level of urban rail transit planning, construction and governance, fully promote the construction of the fifth phase of rail transit project, accelerate the construction of people's satisfaction with transportation, and provide a better travel experience.

1. effect: 2. 1. Enhance structural strength: Due to the addition of steel structure reinforcement plates, the strength and bearing capacity of the steel structure can be enhanced, improving its ability to resist wind, earthquakes, and deformation. 3. 2.2. Extend the service life: Reinforcement plates can improve the local stress of the steel structure and make it uniform, thereby reducing the fatigue damage of the structure and extending its service life. 4. 3.3. Temporary support: In some special circumstances, such as the need to dismantle the old structure and reinforce the new structure during the construction process, steel structure reinforcement plates can be used for temporary support to ensure construction safety. 5. 4.4. Seismic reinforcement: When natural disasters such as earthquakes occur, steel structure reinforcement panels can strengthen the building structure against earthquakes, thereby reducing losses and hazards. 1. Reasons for deformation: 2. 1. Material problem. Choosing poor quality materials can cause the metal mounting plate to deform. 3. 2.2. Uneven installation. When installing a metal fixing plate, uneven force may cause deformation. 4. 3.3. Affected by external forces. During use, the metal fixing plate may be affected by external forces, such as wind, rain, etc. 5. 6. Remedies for deformation: 7. 1. Replace materials. If the deformation of the metal fixing plate is caused by material problems, it is recommended to replace it with a better quality material. 8. 2.2. Reinstall. If the metal fixing plate is deformed due to uneven installation, you can try to reinstall it. 9. 3.3. Strengthen support. If the metal fixed plate is affected by external forces, it is recommended to strengthen the support to increase stability. 10. 4.4. Reinforcement welding. If the metal fixing plate is cracked, reinforcement welding can be considered. 11. 5.5. Replace the metal fixing plate. If none of the above measures solve the problem, it is recommended to replace the metal fixing plate.

China new net Chongqing, December 18 (Zhang Xu) On December 18, as the wall of the last tunnel broke, the first phase of the control project of Chongqing Rail Transit Line 15, which was constructed by Chongqing Railway (Group) Co., Ltd. and contracted by China State Construction Co., LTD., successfully completed the tunnel, 10 months ahead of schedule. The tunnel is located in the section from T3 Terminal Building to Longjun Avenue Station of Chongqing Rail Transit Line 15 Phase I, with a total length of 4,039 meters and a planned construction period of 48 months. It adopts a single-hole double-track horseshoe section and is a typical long mountain tunnel in Chongqing. The tunnel has repeatedly passed through the fault fracture zone, water-rich karst area, gas and goaf and other bad geological sections, there are difficulties in construction, high safety risk, long construction period and other problems, and it is a control node project of the whole line. In the face of the complex geological conditions of the project, the participating units, China Construction No. 3 Bureau and China Construction No. 5 Bureau, adhere to the technology first, comprehensively apply TSP advanced geological prediction, geological radar, horizontal advance borehole and other technologies, deeply grasp the geology, hydrology, environment and other conditions along the tunnel, and clarify the key difficulties and risk points of construction at different stages. The project set up an innovation studio and initiated the Chongqing Construction Science and Technology Project, which has produced 14 scientific research achievements and effectively solved the technical problems in the construction of Causeway Mountain Tunnel. In addition, the project customized the "tunnel network" with 360-degree full perspective three-dimensional scene, to realize the dynamic monitoring of tunnel construction man-machine materials, full environment perception monitoring, process safety monitoring, safety measures control and risk data system integration, to break the traditional tunnel construction relying only on two-dimensional drawings prone to "production data clutter", "telephone scheduling", "information island" and other problems. The tunnel construction management has been upgraded from "human control" to "numerical control", improving the efficiency by about 70%. The first phase of Chongqing Rail Transit Line 15 starts at Jiuquhedong Station and ends at Liangjiang Film City Station, with a design speed of 140 km/h. After completion, it will quickly connect the three major Chongqing troughs and valleys, and realize the direct contact of the three major centers of Xiyong, Liangjiang and Longsheng, which is of great significance to promote the integration of external transportation hubs and lead the urban development pattern.

Description of metal mounting brackets for rail cars: 1. The anchor bolts are installed on the lower part of the main frame, and the lower movable mechanism is connected with the two lower plate chains; the lower supporting wheel is connected with the lower plate chain and the lower rail; the upper movable mechanism is installed on the upper part of the main frame. , the upper supporting wheel is connected with the upper rail and the upper plate chain, the upper rail is installed on the upper movable mechanism; the bracket is connected with the guide rail, the left angle iron and the right angle iron are welded on the guide rail, and are fixed by the first Bolt connection, the guide rail is connected to the rail bottom plate, the movable upper frame is connected to the rail bottom plate, the rearward moving lower frame and the movable upper frame are fixed by a second bolt. The rail car bracket adopts a lower movable mechanism and an upper The movable mechanism can not only avoid the damage of the huge impact force to the bracket, but also adjust the deviation phenomenon that occurs in the operation of the upper and lower supporting wheels during long-term work. Composition: The main components include fixed reinforcement plate, T-slot bolts, flat backing plate, adjusting tooth wing, rack pressure plate, hinge shaft, insulating bracket, insulating claw, threaded copper sleeve, bolts and nuts. Working principle: It is mainly fixed on both sides of the rail through the base and supporting columns, and then the guard rail plate is inserted into the supporting columns to firmly fix it above the rail. During the movement of the train, it plays a strong supporting role to ensure the stability of the rails and the ground and avoid track deviation, collapse and other phenomena. At the same time, in the event of wheel derailment, the guardrail bracket can also effectively prevent accidents such as vehicle rollover and collision, and protect the lives and property of passengers. Structure and function: Its structure generally includes components such as base, guard rail plate, support column and fixing bolts. The guard rail plates are made of high-quality steel and have the characteristics of compression resistance, bending resistance, earthquake resistance, and anti-skid, which effectively protect the rails from damage by external factors. The column part is made of cast iron or steel and has anti-corrosion and anti-rust properties. Fixing bolts are one of the connecting parts of the guard rail bracket. They are generally made of high-strength alloy steel to ensure the stability of the entire equipment. Its role is very important in the railway transportation industry. It can protect the rails from interference from external factors, prevent rail deformation or damage, and avoid major safety accidents such as vehicles jumping off the rails. In addition, it can also improve the stability and comfort of driving, reduce the noise and vibration between the wheels and the track, and ensure the safety and comfort of passengers. Definition and function: It is a metal steel structure used to support electronic equipment in the car. It can support various electronic equipment in the car, such as driving recorders, GPS navigation equipment, phones, MP3 players, and antennas. etc. securely in the vehicle and connect them to the vehicle. This bracket supports the installation and fixation of general mobile phones or other small devices. It can provide stable support on the road, eliminate the impact of adverse vibrations, and avoid dangerous mismatches. Description: It belongs to the technical field of rail transit. Its technical solution is: an equipment installation bracket for rail transit, which is characterized in that it includes a top plate, and the top plate is reserved for installation of a signal machine, a signal box box and an axle counter box box. holes; side plates are provided on both sides below the top plate, and vertical plates are provided on the outsides of the two side plates. The side plates are detachably connected to the vertical plates, and the vertical plates are close to the shield. One side of the structure segment is provided with a mounting plate installed on the shield segment, and the mounting plate has reserved through holes for matching with T-shaped bolts. The beneficial effects of the utility model are: it can realize signal machine and signal at the same time. Installation of chassis box and axle counter box.

On December 10, 2023, the Forum on the high-quality development of rail transit in the Yellow River Basin was held in Xuanye Lake, Jinan City. China Railway Wuhan Electrification Bureau was invited to attend as a key co-organizer. The forum invited more than 300 people, including academicians of the Chinese Academy of Engineering, experts and scholars in the field of rail transit, as well as rail transit science and technology workers from all over the country, to participate in high-level discussions and exchanges. With the theme of "Fostering innovation, creating ecology, extending chain integration and cluster development", the forum focused on the key technologies of underground engineering construction of rail transit, risk prevention and control and management of rail transit, and quality and efficiency improvement and high-quality development of rail transit industry. The academic exchange consists of the main forum and the special forum. At the special forum on rail transit Risk Prevention, control and Management, China Railway Wuhan Electrification Bureau shared and exchanged topics on the Application and Prospect of Hydrogen Fuel cell Rail Transit Service Vehicles. From the background that hydrogen energy is an important way to achieve carbon neutrality, hydrogen fuel cells help the field of rail transit to achieve carbon neutrality, and the transformation of energy structure to green and low-carbon has become a trend, the importance of hydrogen energy application is analyzed, and hot topics such as the development of new technology and management innovation of urban rail transit operation are discussed together under the background of dual-carbon. China Railway Wuhan Electrification Bureau takes digital construction and lean management as the starting point, starting from five stages of project calculation, deepening design, construction and production, test and inspection, delivery and operation and maintenance, focusing on digitalization, intelligence, intensification and standardization. Advanced tools such as CP-Ⅱ CATenary parameter measurement integration device, catenary intelligent detection car, simplified wrist arm preassembly platform, digital catenary hanging string preassembly platform have been applied to the field of rail transit construction. As the "main force" in the construction of urban rail transit in China, China Railway Wuhan Electrification Bureau shoulders the enterprise mission of "ingenuity, electrification pioneer", fully implements industrial innovation, accelerates the research of smart city, assembly construction technology, high-speed rail, maglev, urban intelligent transportation frontier technology research. He has participated in the construction of urban rail transit in more than 30 cities such as Beijing, Wuhan and Guangzhou.

Stainless steel hose is a common consumable that can be used to install various equipment and is corrosion-resistant and rust-resistant, while also preventing water leakage. Stainless steel hose is an important structural part. It has the advantages of corrosion resistance, abrasion resistance, acid and alkali resistance, tensile resistance, etc. With the development of society, the demand for stainless steel will continue to increase. The future development prospects are quite good. Stainless steel sleeve is a common consumable that can be used to install various equipment and is corrosion-resistant and rust-proof, and can also prevent water leakage. The stainless steel sleeve is made of stainless steel and has good thermal resistance, pressure resistance, corrosion resistance, wear resistance, acid and alkali resistance, corrosion resistance, stretch resistance and other characteristics, and can be exposed to the air for a long time Not affected. How to install stainless steel sleeve The stainless steel sleeve can be installed by screw installation, welding, crimping, knob installation and other methods. (1) Screw installation: Put the screw into the nut, then put the nut into the sleeve, and finally tighten the nut with a screwdriver. (2) Welding: Put the stainless steel sleeve and other metal materials together, and then use electric welding equipment to weld them together. (3) Crimping: Put the stainless steel sleeve and other metal materials together, and then use crimping equipment to crimp them together. (4) Knob installation: Place the knob inside the stainless steel sleeve, and then tighten the knob with a tool. Precautions for stainless steel sleeves When using stainless steel sleeves, you should pay attention to the following points: (1) When installing the stainless steel sleeve, care should be taken not to damage it. (2) When installing, be careful not to use excessively large screws. (3) When installing the stainless steel sleeve, care should be taken to prevent moisture. (4) When installing stainless steel sleeves, care should be taken to prevent surface contamination. (5) When installing the stainless steel sleeve, pay attention to check whether the fasteners are loose. Advantages of stainless steel sleeves (1) Stainless steel sleeves have good corrosion resistance and can resist erosion by most strong acids and alkalis. (2) The stainless steel sleeve has good rust resistance and can be exposed to the air for a long time without being affected. (3) The stainless steel sleeve has good pressure resistance and can withstand high pressure. (4) The stainless steel sleeve has good wear resistance, corrosion resistance, acid and alkali resistance, tensile resistance and other characteristics, and can be used in various harsh environments. (5) The stainless steel sleeve has good thermal resistance and can effectively prevent heat loss.

On November 30, Jinan Urban and Rural Transport Bureau, Jinan Public Security Bureau and Jinan Rail Transit Group Co., Ltd. jointly carried out the "Jinan Urban Rail Transit Regulations" (hereinafter referred to as the "Regulations") promotion and implementation activities were held at Bajianbao Station of Rail transit Line 2. It is reported that the regulations have been approved and will be formally implemented on December 1. It is understood that considering that spring water is the largest urban characteristics and urban brand of Jinan, in order to strengthen the protection of spring water and spring veins, in the process of deliberation and amendment of the Regulations, the "priority protection of spring water" is taken as an important principle of legislation, and the protection of spring water and spring water will run through all aspects of urban rail transit planning, construction, operation and management. This activity is intended to convey the significance of the Regulations to the public passengers, enhance the concept of the rule of law of the whole people, promote civilized travel, create a strong atmosphere of the whole society to care about and support the development of urban rail transit, and provide a safer and more convenient environment for the whole people to take the subway. The reporter learned that the "Regulations" clearly state that the municipal transportation department is responsible for the supervision and management of urban rail transit planning, construction and operation, and the Jinan public security, natural resources and planning departments do a good job of relevant management in accordance with their respective responsibilities, and the district and county people's governments along the urban rail transit line assist in the relevant work. At the same time, the urban rail transit business units determined by the Jinan Municipal People's Government according to law are specifically responsible for the construction, operation and management of urban rail transit. In addition, the regulation clearly stipulates that citizens, legal persons and other organizations have the right to complain and report to relevant departments for acts that disrupt the management order of urban rail transit and endanger operational safety. During the event, Bajianbao Station Hall attracted a large number of citizens to stop and ask questions by opening an information desk, hanging banners, and distributing promotional materials. The law enforcement personnel of Jinan Transportation Comprehensive Administrative law Enforcement Detachment and the staff of Rail Group professionally and carefully answered the most concerned, most urgent and most difficult problems encountered by the public, and then the public took the initiative to sign on the publicity banner to express their willingness to be law- abiding citizens and help the healthy development of rail transit. On rail transit Line 2, trains loaded with knowledge of the law are shuttling through every corner of the city. The train electronic display screen plays the "Regulations Publicity" video produced by the Jinan Transportation Comprehensive Administrative Law Enforcement Detachment "Quan Xiaohui" law popularizing brand, explaining to the public the laws and regulations that need to be observed when taking rail transit, and bringing a full range of publicity experience to passengers. The promulgation of the Regulations on Jinan Urban Rail Transit is of great significance to standardize and improve the planning, construction, operation and emergency management of Jinan rail transit, ensure the safety of rail transit, improve the quality of operation and service, and safeguard the legitimate rights and interests of all parties, and will also promote the rail transit industry to a new level.

1. The role of the ground wire: 1. Protect personal safety: The role of the grounding wire is to protect personal safety. When static electricity discharges, a large amount of charge is generated, which can easily cause great harm to the electrical appliance itself and the human body. The grounding wire can avoid being damaged by the charge. The grounding wire has an important role in lightning protection. The protective effect can effectively extend the service life of electrical equipment. When electrical equipment leaks or is inductively charged, current can be quickly poured into the earth through the grounding wire so that the equipment shell is no longer charged, thus ensuring the safety of personnel and equipment. Lightning protection: During thunderstorms, many tall buildings are in danger of being struck by lightning. However, after lightning protection measures are taken, the current can flow into the underground buildings along the grounding wire and remain intact. Introduction: In electrical appliances, the ground wire is a line connected to the shell of electrical equipment and other parts to promptly conduct out unsafe charges or leakage currents generated due to various reasons. (1) Function of high-voltage grounding wire: High-voltage grounding wire is used in line and substation construction to prevent electrostatic induction from nearby charged objects and ensure safety when electric shock occurs or when the switch is accidentally closed. (2) High-voltage ground wire structure: The portable high-voltage ground wire consists of an insulated operating rod, wire clamp, short-circuit line, ground wire, ground terminal, bus clamp, and ground clamp. (3) High-voltage ground wire manufacturing process: Excellent manufacturing process - the wire clamp and grounding clamp are made of high-quality aluminum alloy die-casting; the operating rod is made of epoxy resin colored tube, with good insulation performance, high strength, light weight, bright color and beautiful appearance. Smooth; the grounding soft copper wire is made of multiple strands of high-quality soft copper wires and is covered with a soft, high-temperature-resistant transparent insulating sheath, which can prevent wear and tear on the grounding copper wire during use. The copper wire meets the fatigue test requirements. Ensure the safety of workers during operation. (4) Grounding wire specifications: According to ministry regulations, the grounding wire must be made of bare copper soft wire of 25mm 2 or more. The basic components of the grounding method: The components of the grounding method can be divided into two parts: electrical equipment and power distribution systems. 1. Grounded parts of electrical equipment (1) Ground body: A conductor or a group of conductors that is in close contact with the earth and forms an electrical connection with the earth. (2) Exposed conductive parts: conductive parts that can be touched by electrical equipment. It is not energized under normal circumstances, but may be energized during a fault. It is usually the metal casing of electrical equipment. (3) Main grounding terminal board: a combination of various grounding (such as working grounding, protective grounding) terminals and equipotential bonding wire terminals in a building or part of a building. If arranged in a row, it is called the main ground terminal block. (4) Protective wire (PE): A conductor that electrically connects any part of the above-mentioned exposed conductive parts, the main grounding terminal board, the grounding body, and the power supply grounding point (or artificial grounding point). A conductor connecting multiple exposed conductive parts is called a protective trunk. (5) Ground wire: Connect the main ground terminal board or the exposed conductive part directly to the protective wire of the ground body. A ground wire connecting multiple ground terminal boards is called a ground trunk. (6) Equipotential connection: refers to an electrical connection in which the potentials of each exposed conductive part and the conductive part outside the device are substantially equal. Grounded portion of the power distribution system (1) Phase line (L). Conductors that carry electrical energy are not normally grounded. (2) Neutral wire (N). A conductor connected to the neutral point of the system and capable of transmitting electrical energy. (3) Protect the neutral line (PEN). A conductor that functions as both a protective line and a neutral line. (4) Power ground point. Ground the power supply at a point where it can be grounded (usually the neutral point) Classification of grounding: The grounding method of my country's power distribution system has been stipulated by IEC. Its classification is still based on the grounding combination of the power distribution system and electrical equipment, and is generally divided into TN, TT, IT systems, etc. The meaning of the above letters: the first letter indicates the relationship between the power supply ground point and the ground. Among them, T means direct grounding; I means not grounded or grounded through impedance. The second letter indicates the relationship between the exposed conductive parts of the electrical equipment and earth. Among them, T means a separate direct grounding that is not connected to the power supply grounding point; N means it is directly connected to the power supply system grounding point or to a conductor drawn from this point. Depending on whether the neutral line and the protection line are merged, the TN system is divided into TN-C, TN-S and TN-C-S systems. TN-C system: The protection line and neutral line are combined into a PEN line. TN-S system: The protective line and the neutral line are separated. TN-C-S system: The protection line and neutral line in a section near the power supply side are combined into a PEN line, and are divided into protection line and neutral line from a certain point onwards. Resistor requirements: The requirements for the resistance of high-voltage short-circuit grounding wires to ground determine the quality of the grounding wire. Generally, according to the technical regulations of the power industry DL-T879-2004, the resistance of each cross-sectional area of the grounding wire to ground shall not be greater than the following values: Measure the DC resistance between the terminal lugs. For various cross-sections of 16mm2, 25mm2, 35mm2, 50mm2, 70mm2, 95mm2, and 120mm2, the average resistance value per meter should be less than 1.24mΩ, 0.79mΩ, 0.56mΩ, 0.40mΩ, and 0.28mΩ respectively. ,0.21mΩ,0.16mΩ Technical parameters: (1) 10KV high-voltage grounding wire Insulated rod length: 700 mm Handshake length: 300 mm Metal joint length: 50 mm Number of sections: 1 Rod diameter: 30mm Total length (excluding wire clamp): 1050 mm (2) 35KV grounding wire Nominal cross-section: 25mm2 Total number of wires: 810 Average diameter (mm): 0.2mm Calculated cross-section: (mm2): 25.43 Metal joint length: 50 mm Number of sections: 1 Rod diameter: 30mm (3) 110KV high-voltage grounding wire Nominal cross-section: 35mm2 Total number of wires: 1136 Average diameter (mm): 0.2mm Calculated cross-section: (mm2): 35.67 Insulation rod length: 1360 mm Handshake length: 700 mm Metal joint length : 140 mm Number of sections: 2 Rod diameter: 30mm Total length (excluding wire clamp): 2200 mm Instructions for use: (1) When hanging the ground wire: connect the ground clamp first, then the electric clamp; when removing the ground wire, you must first remove the electric clamp and then the ground clamp according to the procedure. (2) Installation: Fix the double-eye copper nose on the grounding soft copper wire at the corresponding position of the power clamp on the ground rod (the power clamp has fixed and movable types), and connect the single-eye copper nose on the ground wire. Fix it on the ground clip or ground pin to form a complete set of ground wires. (3) Verify whether the voltage level of the ground rod is consistent with the voltage level of the operating equipment. (4) Grounding soft copper wires are available in split-phase and combined types, and grounding rods are available in flat-mouth and double-hook type clamps. Use and maintenance: Before using the portable short-circuit grounding wire, you should first check the power to confirm that there is a power outage, and then proceed after confirming that there is no voltage on the equipment. First connect the grounding clamp to the grounding grid or flat iron, and then use a grounding rod to tighten the wire ends to the equipment wires. When removing the short-circuited ground wire, the sequence is exactly the reverse of the above. The distance between the installed short-circuit ground wire and the live equipment, taking into account the influence of the ground wire swing, should be no less than the value newly specified in the "Electrical Safety Work Regulations". It is strictly prohibited to use a wire clamp instead of winding to short-circuit the ground. If there is a grounding point at the suspension point, a grounding clip or a special copper rod should be used for the grounding connection; if there is no fixed grounding point available, a temporary grounding point can be used, and the grounding electrode should be buried underground to a depth of not less than 0.6m. Portable short-circuit ground wires should be kept properly. Before each use, you should carefully check whether it is intact, the soft copper wire is not exposed, and the nut is not loose, otherwise it must not be used. The inspection cycle of the portable short-circuit grounding wire is once every five years, and the inspection items are the same as the factory inspection. After a portable short-circuit grounding wire that has passed the test is subjected to a short-circuit, it should be judged based on the size of the short-circuit current and appearance inspection, and generally should be scrapped.

November 28th Wuhan Optics Valley modern tram L3 Soon to open trial operation! L3 starts from Central China Railway Station in the north, and ends at Tangxunhu Station in the south, with a total of 15 stations, connecting two main roads, Guanshan Avenue and University Park Road, serving about 200,000 people in the surrounding industrial parks and mature communities. After the opening of L3, it takes only 3 minutes to cross the three-ring Line by taking "Optics Valley Quantum" (taking Vanke City Garden Station to Huaxia College Station as an example), which will improve the daily commuting efficiency and ride experience of passengers as a whole. By then, Wuhan University Science Park, Huazhong University of Science and Technology Science Park, Wuhan University of Technology Science and Technology Park, the Great Wall Industrial Park, Optics Valley Science and Technology Port, light grain Port, light storage Industrial Park office workers, as well as Yulong Island, Sunshine Coast, Maodian and other community residents will be more diversified, convenient and comfortable. At the same time, L3 can also be quickly transferred to Metro Line 2 at Central China Railway Station and Guanggu Walking Street Provincial Hospital of Traditional Chinese Medicine Station, respectively, and residents along University Park Road can take rail transit to reach the three towns of Wuhan. Optics Valley tram was put into trial operation in April 2018, running two routes, L1 and L2, with a total length of 32 kilometers and 42 stations. The upcoming L3 will be the third interchange. L3 Ride Guide More information [ First and Last bus time ] Central China Railway Station: 6:09-22:05 Tangxunhu Station: 6:00-21:30 [ Ticket purchase method ] Full fare 2 yuan/person 1, Wuhan pass credit card; 2. "Alipay, wechat, cloud flash payment" travel services Swipe the electronic ride code; 3, platform self-service ticket machine cash Purchase a paper one-way ticket; 4, download the "Optics Valley Cloud ticket" APP code. [ Train identification ] In order to effectively distinguish between the three incoming trains, Convenient for passengers to enter the station and board Avoid taking the wrong bus Before getting on the bus It can be identified in a number of ways: ★ Locomotive distinction: L3 is sky blue L2 is moxa green L1 is Snow White ★ Front and side electronic screen: Fixed display of routing information

Metal Ground Sockets - Standard Sizes type: 1. Pop-up grounding socket: The grounding plug is easy to open using the figure-eight dial. The overall curved panel is very beautiful, and the front and rear screws of the upper cover are more securely fixed. 2. Open-circuit grounded socket: The plug can be inserted together with the socket to cover the upper cover, leaving only the plug wire, which is convenient for passage and cleaning. Side-plugged products are more suitable for strong and weak current installations, which can meet the different needs of customers and are especially suitable for engineering projects. use. 3. Spiral ground socket: A truly waterproof ground socket, it is the best choice for installing weak current modules. It is very convenient to open. It has horizontal fine-tuning and heightening devices. The copper cover on the surface cannot be installed because it is skewed or the bottom box is embedded too deep. 4. Sliding ground socket: push the button down gently, and the upper cover will automatically push forward and pop open. When in use, since the upper cover is open, the feet cannot be mixed, eliminating the risk of accidents. It adopts U series functional parts and is equipped with four-position three-plug Multifunctional, it can also install a six-position computer module. The weak current end at the bottom can be shielded with a stainless steel cover. It is especially ideal for installing strong current and weak current together. 5. Hidden ground socket: It can be opened and closed by gently pressing the small cover in the middle. It is very convenient to use. The thickness is only 1.5mm and can be close to the desktop. The screws on both sides are removable and the support of the functional parts can be removed, which is very convenient for the functional parts. support and replacement. Purpose of grounded socket: 1. When leakage occurs when the phase wire inside the electrical equipment is connected to the outer casing, leakage current will flow through the ground wire, and the line protection device (leakage switch and miniature circuit breaker) will perform tripping protection. 2. Ensure that the potential of the shell of the electrical equipment is 0. Even if there is a leakage, it will not cause an electric shock to the human body. 1: Advantages 1. Easy to use: For example, in the living room, an electric tea tray is installed next to the coffee table, which is easy to use and makes tea more convenient; if a floor plug is installed in the restaurant, there is no need to pull a long plug wire to eat hot pot. The ground plug comes in handy immediately, so you don`t have to worry about messy wiring tripping. 2. Easy installation: The ground plug can adapt to different construction environments, different structures, and floor requirements of different thicknesses, and the pipe grooves are also easy to connect; they can be coordinated with the appearance of the ground. 3. Wear-resistant and corrosion-resistant: The place where the grounding plug is used determines that the material it is produced is more wear-resistant and corrosion-resistant than ordinary switch sockets, and it is also waterproof Installation method: 1. Installation of the bottom box: First, determine the installation location. For ground plug installation, choose a relatively dry space location, connect the bottom box to the metal wire conduit, and pour concrete to fix the bottom box. Second, determine the embedding depth. Generally speaking, in order to ensure that the uppshould er cover can fit perfectly with the ground, the upper end of the bottom box be 3-5 mm lower than the ground, so that it will not protrude too much and cause potential danger, nor will it sink inward and cause Inconvenient to use. . Installation of the upper cover: After the concrete is poured and fixed, remove the protective cover of the bottom box, clean the dust and debris in the box, and clean the gaps. Secondly, apply anti-corrosion coating around the holes in the ground. The concrete material around the holes must be completely dry before installation. Since the ground plug is installed on the ground and is in direct contact with the tiles on the ground, if anti-corrosion treatment is not carried out, the incompletely dried concrete material will cause efflorescence when it comes into contact with the metal, corroding the ground plug cover. After anti-corrosion treatment, connect the ground wire between the bottom box and the upper cover and fix the upper cover.

On November 17, Chongqing Transportation Kaidou Group released a news that the public art design scheme of the interior space of Feixue Temple Station and Huxi Station of Line 7 of Chongqing Rail Transit was announced. Let's see what the future of these two stations looks like! Urban rail facilities are an important part of urban public space, an important window to display urban cultural and artistic taste and spiritual outlook, and also a space scene that ordinary people can directly experience and perceive. Chongqing Transportation Kaitou Group organized a public art design competition for the interior space of Feixuesi Station on Line 7 and Huxi Station on Line 17 of Chongqing Rail Transit. A total of 13,248 votes were received during the public voting of 10 schemes at the two sites. Combined with the public voting and expert review opinions, the selected schemes of the two sites were finally announced. The scheme is based on the characteristics of the surrounding environment of the site to create a unique natural and rustic style of public transportation space. The raw and rough natural stone texture is taken as the main design element, which has great visual tension and spatial texture. Through the contrast of materials and colors, the rough and delicate, dark and light colors are organically combined to enhance the design sense. The ground adopts anti-slip and wear-resistant terrazzo ground, carries forward the traditional construction technology, and controls the cost reasonably. The ceiling is combined with LED lamps and light gray aluminum panels to create a bright, elegant and elegant space atmosphere. Based on the daily life and learning needs of college students and citizens around the site, the program effectively uses the end, corner and other spare Spaces to lay out places for short rest, study and display without affecting normal traffic, organically integrates urban public space with traffic space, and creates a better youth-friendly and cultural atmosphere. The overall space design takes "digital forest" as the theme. Through the combination of lights, walls, columns and other elements, three spatial nodes are created: "Morning Sun Hall" (station hall level), "underwater secret environment" (platform level) and "Butterfly Valley" (escalator passage). Moreover, station intelligent system is used to control lighting brightness and natural sound effect in real time. But you can feel the forest dawn, birds, flowers, butterflies, and sunlight through the water of nature fresh scenery.

Function: 1. In moving parts, the wear of the parts is caused by long-term friction. When the gap between the important official and the hole is worn to a certain extent, the parts must be replaced. Therefore, designers choose materials with lower hardness and better wear resistance as shaft sleeves or bushings during design, which can reduce wear of the shaft and seat. When the shaft sleeve or bushing is worn to a certain extent, it can be replaced, which can save the cost of replacing the shaft or seat. Generally speaking, the bushing and valve seat use an interference fit. However, the clearance fit with the shaft can only extend the service life, because wear and tear cannot be avoided anyway, and shaft parts are relatively easy to process. Some new designers do not like this design and think it increases manufacturing costs. However, after a period of use, such modifications are still needed for maintenance. However, the reason why modifications can easily reduce the accuracy of the equipment is simple. Secondary processing cannot guarantee the position of the center of the seat hole. In some places where the rotation speed is low, the radial load is large, and the clearance requirements are high (such as camshafts), rice is used instead of rolling bearings (in fact, the bushing can be regarded as a sliding bearing). This material requires low hardness and wear resistance. After the inner hole of the shaft sleeve is polished and smoothed, the matching accuracy can be very high. There must be an oil coffin for lubricating oil on the inner wall. The lubrication of the shaft sleeve is very important. If it is dry ground, the shaft and bushing will go very quickly. In order to save material, the wall thickness of the bushing is designed according to the axial load required by the bearing. Generally, cast copper and bearing alloy materials are used. Bushings can be divided into open and non-open, depending on the needs of the structure. The bushing generally cannot bear axial load, or can only bear small axial load. Or thrust bearing. The shaft is usually round. Bushing sleeves are often used as liners. Shafts can come in various shapes, as can bushings. The sleeve can be anti-corrosion with rice to eliminate assembly gaps, etc. And the materials used are the same. The bushing generally plays an axial positioning role, and the end is exposed to compressive stress and comes into contact with gear bearings and other parts. Sometimes the shaft comes into contact with sealing rings, etc. .Not suitable for occasions with high speed and large length. Shaft sleeves can have different uses in different situations. It can be positioned axially, which can reduce wear and vibration, and can also be used to isolate the shaft from harmful media, thereby extending the life and durability of the shaft. 1. Classification of stainless steel shaft sleeves: 2. 1. 304 stainless steel bushing 3. 304 stainless steel bushings are the most common type and are commonly used in bearings, gears, mechanical transmission parts, etc. It has excellent corrosion resistance and high temperature resistance, but low strength, and is often used in some small and medium-sized mechanical equipment. 4. 2. 316 stainless steel bushing 5. 316 stainless steel bushings have stronger corrosion resistance and can withstand the corrosion of some strong acid and alkali media. They are often used in marine equipment, chemical equipment, food processing equipment and other occasions that need to withstand strong acid and alkali media. 6. 3. 420 stainless steel shaft sleeve 420 stainless steel shaft sleeve is a stainless steel material with high hardness. It is often used in power tools, auto parts and other occasions that need to withstand high strength and wear. 7. 4. 430 stainless steel bushing 8. The price of 430 stainless steel bushings is relatively low and is often used in some low-end mechanical equipment, household equipment, etc., but its corrosion resistance and strength are low. The relationship between shaft sleeve and stainless steel: The bushing is a component highly respected by mechanical engineers. It plays an important role in mechanical transmission, light-load rotation and high-speed operation. Stainless steel is a kind of steel with corrosion resistance, high temperature resistance and other characteristics, and can work in harsh environments. Therefore, stainless steel bushings are gradually being widely used in mechanical equipment in various industries.