Electro-hydraulic switch machine air cylinder magnetic repulsion centering pressure difference balancing structure
Patent Information
- Application Number
- CN202611316149.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-28
- Publication Date
- 2026-09-25
AI Technical Summary
[0004]然而，现有的电液转辙机启动油缸及配套补偿方案使用时，存在显著技术缺陷：一方面，启动油缸需同时兼顾“电机启动时的小负载精准输出”与“静态时的道岔稳定锁闭”双重需求，而现有主动补偿技术未能从根本上消除缸内压差，仅能对已产生的窜动风险进行事后补救，无法杜绝柱塞非预期移动的根源，不仅可能影响启动时的负载输出精度，还易导致静态锁闭状态下道岔位置偏移；另一方面，系统依赖精密传感元件与复杂控制算法，不仅使启动油缸整体结构复杂、调试难度增加，还大幅提升了制造成本与维护成本，且铁路沿线户外作业环境恶劣，温差大、粉尘多、振动频繁，额外引入的电子元器件易受环境干扰出现故障，可靠性不足，难以长期稳定运行
1.通过设置微通槽结构与同级磁斥力对中机构，使得设备停止工作时，柱塞位于钢筒的中部位置；
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Figure CN122812923A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of hydraulic control systems, and in particular to a magnetic repulsion centering differential pressure balance structure for an electro-hydraulic switch machine's pneumatic cylinder. Background Technology
[0002] A starting cylinder for an electro-hydraulic switch machine provides a controllable small load by moving a plunger at the moment the switch machine motor starts, effectively overcoming the problem of insufficient starting torque of the AC motor, ensuring smooth motor start-up and driving the turnout to complete the switching, while maintaining reliable locking of the turnout after the motor starts.
[0003] Currently, existing electro-hydraulic switch machine starting cylinders typically include a cylinder barrel, plunger, and seals. Their anti-slip-up solutions mainly rely on active compensation technology, requiring additional external sensing and control systems such as temperature sensors, pressure sensors, controllers, and actuators. During operation, when the switch machine motor starts, the hydraulic system adjusts the pressure in the two chambers of the starting cylinder, driving the plunger to move and providing a preset small load to assist the motor in overcoming the problem of insufficient starting torque. After the turnout conversion is completed, the plunger locks to maintain the turnout locked state. When the equipment is in a static holding period, the temperature difference in the outdoor environment causes the hydraulic oil to expand and contract. Due to the different volumes of hydraulic oil on both sides of the plunger in the cylinder, a pressure difference is formed after the hydraulic oil on both sides expands and contracts. Sensors monitor temperature, pressure, or displacement signals in real time and feed them back to the controller. The controller then drives the actuator to perform pressure compensation to suppress the unexpected slippage of the plunger.
[0004] However, the existing electro-hydraulic switch machine starting cylinder and its supporting compensation scheme have significant technical defects: On the one hand, the starting cylinder needs to simultaneously meet the dual requirements of "precise output of small load when the motor starts" and "stable locking of the turnout in static state". However, the existing active compensation technology cannot fundamentally eliminate the pressure difference in the cylinder. It can only remedy the risk of spurious movement after it has occurred. It cannot eliminate the root cause of the plunger's unexpected movement. This may not only affect the accuracy of the load output during startup, but also easily lead to the turnout position deviation in the static locking state. On the other hand, the system relies on precision sensing elements and complex control algorithms, which not only makes the overall structure of the starting cylinder complex and increases the difficulty of debugging, but also significantly increases the manufacturing and maintenance costs. Moreover, the outdoor working environment along the railway is harsh, with large temperature differences, a lot of dust, and frequent vibrations. The additional electronic components are susceptible to environmental interference and failure, resulting in insufficient reliability and difficulty in long-term stable operation. Summary of the Invention
[0005] To overcome the above problems, this application provides a magnetic repulsion centering differential pressure balance structure for the pneumatic cylinder of an electro-hydraulic switch machine.
[0006] This application provides a magnetic repulsion centering pressure difference balance structure for the pneumatic cylinder of an electro-hydraulic switch machine, which adopts the following technical solution: A magnetic repulsion centering differential pressure balance structure for an electro-hydraulic switch machine's pneumatic cylinder includes a device body, a steel cylinder, a microchannel structure, and a magnetic repulsion centering mechanism of the same level. The device body is horizontally positioned and has mounting holes. Two sets of oil circuit systems are provided on the device body. The steel cylinder is located within the mounting holes and connects the two sets of oil circuit systems. A plunger is slidably disposed within the steel cylinder, isolating the two sets of oil circuit systems. The microchannel structure is located in the middle of the steel cylinder; when the plunger is in the middle of the steel cylinder, the microchannel structure connects the two sets of oil circuit systems. The magnetic repulsion centering mechanism of the same level is located on the steel cylinder and drives the plunger to the middle position of the steel cylinder.
[0007] By adopting the above technical solution, in the initial state, the plunger is located in the middle of the steel cylinder. When the temperature difference in the outdoor environment causes the hydraulic oil to expand and contract, the microchannel structure connects the two sets of oil circuit systems. The hydraulic oil on both sides of the plunger flows bidirectionally through the microchannel structure, so that the hydraulic pressure on both sides of the plunger is in the same pressure range. At the same time, the same-level magnetic repulsion centering mechanism drives the plunger to always be in the middle of the steel cylinder. When the electro-hydraulic switch machine is started, the motor on the electro-hydraulic switch machine drives the hydraulic pump station to work. The hydraulic pump station delivers hydraulic oil to the steel cylinder. The pressure of the hydraulic oil in the steel cylinder is greater than the magnetic repulsion of the same-level magnetic repulsion centering mechanism. The hydraulic oil drives the plunger to move and provides load. At the same time, the plunger slides to one end of the steel cylinder. The microchannel structure is located on one side of the plunger. The plunger isolates the two sides of the steel cylinder. The two sets of oil circuit systems work independently, so that the equipment does not require additional sensors and control elements. It changes from passive compensation to active balancing, so that the pressure on both sides of the plunger is equal.
[0008] Optionally, the oil circuit system includes an oil inlet on the equipment body, an oil outlet for the main hydraulic cylinder on the equipment body, a gasket pipe located in the mounting hole, and an oil outlet for the auxiliary hydraulic cylinder on the equipment body; the oil inlet, the oil outlet for the main hydraulic cylinder, and the mounting hole are connected; the gasket pipes are respectively located on one side of the steel cylinder, the gasket pipes are connected to the steel cylinder, and a first connecting hole and a second connecting hole are provided on the side wall of the gasket pipe; the first connecting hole is located at the connection between the mounting hole and the oil inlet; the oil outlet for the auxiliary hydraulic cylinder is connected to the mounting hole, and the connection is located at the second connecting hole; a sealing mechanism is provided on the equipment body, the sealing mechanism is located in the mounting hole, and is used to seal the two sets of gasket pipes.
[0009] By adopting the above technical solution, when the motor on the electro-hydraulic switch machine is working, the motor drives the hydraulic pump station to work, and the hydraulic pump station drives the hydraulic oil in the oil tank to flow into the oil inlet. The hydraulic oil flows into the steel cylinder through the first connecting hole and the gasket pipe, so that when the motor is initially working, the hydraulic oil can easily flow into the steel cylinder, and the plunger can easily slide along the length of the steel cylinder. The oil outlet of the main machine cylinder and the oil outlet of the auxiliary machine cylinder correspond to different working oil circuits, which meets the requirements of the electro-hydraulic switch machine for turnout switching and locking.
[0010] Optionally, the sealing mechanism includes a first screw plug and a second screw plug; the first screw plug is inserted into one end of the mounting hole and is threadedly connected to the device body; the second screw plug is inserted into the end of the mounting hole away from the first screw plug and is threadedly connected to the device body.
[0011] By adopting the above technical solution, when the steel cylinder needs to be disassembled and replaced, the operator can screw on the first and second screw plugs to disengage them from the equipment body, thus making the steel cylinder easy to disassemble and replace.
[0012] Optionally, the microchannel structure includes a spiral channel formed at the middle position of the inner wall of the steel cylinder.
[0013] By adopting the above technical solution, when the plunger is in the middle of the steel cylinder, the spiral structure increases the flow path length of the hydraulic oil, and the hydraulic oil in both oil circuits flows slowly and smoothly in both directions, so that the pressure on both sides of the plunger is the same, thereby achieving pressure difference balance in the steel cylinder; when the plunger is located at one end of the steel cylinder, the spiral guide groove is located on one side of the plunger, and the plunger isolates both sides of the steel cylinder, making it difficult for the hydraulic oil to leak.
[0014] Optionally, the microchannel structure includes a short radial groove formed at the middle position of the inner wall of the steel cylinder.
[0015] By adopting the above technical solution, when the pressure difference between the two sides of the plunger is large, the radial short groove can quickly clear the area with a large local pressure difference in the steel cylinder, so that when the plunger is located in the middle of the steel cylinder, the hydraulic oil in the oil circuit on both sides of the plunger can flow easily.
[0016] Optionally, the same-level magnetic repulsion centering mechanism includes two sets of first permanent magnet rings embedded on the outer wall of the steel cylinder and two sets of second permanent magnet rings embedded on the plunger; the two sets of first permanent magnet rings are respectively located at both ends of the steel cylinder, and the two sets of second permanent magnet rings are respectively arranged corresponding to the two sets of first permanent magnet rings, and the same-level magnetic poles are opposite each other.
[0017] By adopting the above technical solution, the first permanent magnet rings at both ends of the steel cylinder and the second permanent magnet ring on the plunger are set with the same magnetic poles facing each other. The magnetic force of the same poles repelling each other forms a bidirectional repulsive force, so that the plunger is always located in the middle of the steel cylinder. The annular structure of the permanent magnet rings makes the magnetic force distribution uniform, ensuring the force balance of the plunger and avoiding the centering deviation caused by uneven magnetic force.
[0018] Optionally, multiple spiral guide grooves are spaced apart along the circumference of the steel cylinder.
[0019] By adopting the above technical solution, multiple spiral guide grooves are evenly distributed along the circumference of the steel cylinder, making the flow of hydraulic oil more uniform and avoiding local flow obstruction caused by a single groove. Especially when the temperature difference changes greatly and the pressure difference is generated rapidly, the pressure balance on both sides of the plunger can be achieved more quickly, further reducing the risk of plunger movement.
[0020] Optionally, the width of the spiral guide groove is 0.1 mm to 1.0 mm.
[0021] By adopting the above technical solution, the groove width is set in the range of 0.1-1.0 mm, which can ensure that the hydraulic oil has a sufficient flow cross section to achieve pressure difference balance, and can also avoid oil circuit pressure leakage when the motor starts due to excessive groove width, which would affect the load output accuracy of the plunger.
[0022] Optionally, a relief groove is provided on the outer side wall of the steel cylinder, and a leak-proof washer is embedded in the relief groove, the leak-proof washer abutting against the inner side wall of the mounting hole.
[0023] By adopting the above technical solution, the anti-leakage gasket is embedded in the relief groove and closely abuts against the inner wall of the mounting hole to form a reliable sealing structure, preventing hydraulic oil from leaking from the gap between the steel cylinder and the mounting hole, ensuring the sealing performance and stable working pressure of the oil circuit system; the relief groove plays a role in positioning and fixing the anti-leakage gasket, preventing the anti-leakage gasket from shifting or falling off due to vibration during equipment operation, and improving the durability of the seal.
[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting up a microchannel structure and a magnetic repulsion centering mechanism of the same level, the plunger is located in the middle of the steel cylinder when the equipment stops working; 2. By setting up a sealing mechanism, the steel cylinder can be easily disassembled and replaced. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this application; Figure 2 This is a cross-sectional view of Embodiment 1 of this application; Figure 3 This is a cross-sectional view of Embodiment 2 of this application.
[0026] Explanation of reference numerals in the attached drawings: 1. Equipment body; 11. Mounting hole; 12. Oil circuit system; 121. Oil inlet; 122. Main engine cylinder oil outlet; 123. Gasket pipe; 1231. First connecting hole; 1232. Second connecting hole; 124. Auxiliary engine cylinder oil outlet; 2. Steel cylinder; 21. Plunger; 22. Relief groove; 23. Leak-proof washer; 3. Micro-channel structure; 31. Spiral guide groove; 32. Radial short groove; 4. Same-level magnetic repulsion centering mechanism; 41. First permanent magnet ring; 42. Second permanent magnet ring; 5. Sealing mechanism; 51. First screw plug; 52. Second screw plug. Detailed Implementation
[0027] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail. Example 1
[0028] This application discloses a magnetic repulsion centering pressure difference balancing structure for the pneumatic cylinder of an electro-hydraulic switch machine. (Refer to...) Figure 1 and Figure 2 A magnetic repulsion centering differential pressure balance structure for an electro-hydraulic switch machine's pneumatic cylinder includes a device body 1, a steel cylinder 2, a microchannel structure 3, a magnetic repulsion centering mechanism 4 of the same level, and a sealing mechanism 5. The device body 1 is horizontally positioned and has mounting holes 11. Two sets of oil circuit systems 12 are located on both sides of the device body 1. The steel cylinder 2 is located within the mounting holes 11 and connects the two sets of oil circuit systems 12. A plunger 21 is slidably disposed within the steel cylinder 2, isolating the two sets of oil circuit systems 12. The microchannel structure 3 is located in the middle of the steel cylinder 2; when the plunger 21 is in the middle of the steel cylinder 2, the microchannel structure 3 connects the two sets of oil circuit systems 12. The magnetic repulsion centering mechanism 4 is located on the steel cylinder 2 and drives the plunger 21 to the middle position of the steel cylinder 2. The sealing mechanism 5 is located at both ends of the steel cylinder 2 and seals the steel cylinder 2.
[0029] In the initial state, the plunger 21 is located in the middle of the steel cylinder 2. When the temperature difference of the outdoor environment causes the hydraulic oil to expand and contract, the micro-channel structure 3 connects the two sets of oil circuit systems 12. The hydraulic oil on both sides of the plunger 21 flows bidirectionally through the micro-channel structure 3. The hydraulic pressure on both sides of the plunger 21 is in the same pressure range. At the same time, the same-level magnetic repulsion centering mechanism 4 drives the plunger 21 to always be in the middle of the steel cylinder 2.
[0030] When the electro-hydraulic switch machine is started, the motor on the electro-hydraulic switch machine drives the hydraulic pump station to work. The hydraulic pump station delivers hydraulic oil to the steel cylinder 2. The hydraulic pressure in the steel cylinder 2 is greater than the magnetic repulsion force of the same level magnetic repulsion centering mechanism 4. The hydraulic oil drives the plunger 21 to move and provide load. At the same time, the plunger 21 slides to one end of the steel cylinder 2. The micro-channel structure 3 is located on one side of the plunger 21. The plunger 21 isolates the two sides of the steel cylinder 2, and the two sets of oil circuit systems 12 work independently.
[0031] Reference Figure 1 and Figure 2 The mounting hole 11 is circular. The oil circuit system 12 includes an oil inlet 121, a main engine cylinder oil outlet 122, a gasket pipe 123, and an auxiliary engine cylinder oil outlet 124. The oil inlet 121 is located on one side of the equipment body 1, and the main engine cylinder oil outlet 122 is located on one side of the equipment body 1. The oil inlet 121, the main engine cylinder oil outlet 122, and the mounting hole 11 are connected. The gasket pipe 123 is located on one side of the steel cylinder 2. The gasket pipe 123 is circular and is connected to the steel cylinder 2. A first connecting hole 1231 and a second connecting hole 1232 are provided on the side wall of the gasket pipe 123. The first connecting hole 1231 and the second connecting hole 1232 are circular. The first connecting hole 1231 is located at the connection between the mounting hole 11 and the oil inlet 121. The sealing mechanism 5 is used to seal the gasket pipes 123 on both sets of oil circuit systems 12. The oil outlet 124 of the auxiliary machine cylinder is located at the top of the equipment body 1 and is connected to the mounting hole 11. The connection between the oil outlet 124 of the auxiliary machine cylinder and the mounting hole 11 is located at the second connecting hole 1232.
[0032] Reference Figure 2 The steel cylinder 2 is horizontally positioned and is cylindrical in shape. The steel cylinder 2 is slidably connected to the equipment body 1 along the length of the steel cylinder 2. A clearance groove 22 is provided on the outer wall of the steel cylinder 2. The clearance groove 22 is annular in shape. A leak-proof washer 23 is embedded in the clearance groove 22. The leak-proof washer 23 is made of rubber.
[0033] When the motor on the electro-hydraulic switch machine is working, it drives the hydraulic pump station, which in turn drives the hydraulic oil in the tank to flow into the inlet 121. The hydraulic oil at the inlet 121 flows into the steel cylinder 2 through the first connecting hole 1231 and the gasket pipe 123. When the hydraulic oil flows into the steel cylinder 2, the plunger 21 slides along the length of the steel cylinder 2. The oil outlet 122 of the main machine cylinder and the oil outlet 124 of the auxiliary machine cylinder correspond to different working oil circuits, meeting the turnout switching and locking requirements of the electro-hydraulic switch machine. When the steel cylinder 2 needs to be disassembled and replaced, the operator screws the first screw plug 51 and the second screw plug 52, disconnecting the first screw plug 51 and the second screw plug 52 from the equipment body 1. The operator then removes the steel cylinder 2 from the mounting hole 11.
[0034] The microchannel structure 3 includes a spiral guide channel 31. The spiral guide channel 31 is located in the middle of the inner wall of the steel cylinder 2, and the width of the channel ranges from 0.1 mm to 1.0 mm. In the embodiments of this application, multiple sets of spiral guide channels 31 can be arranged circumferentially. Multiple sets of spiral guide channels 31 facilitate the flow of hydraulic oil, thereby making it easier to balance the pressure on both sides of the plunger 21.
[0035] Below are the test results for groove widths of 0.3 mm and 0.5 mm under multiple pressure conditions (3.5 MPa, 7 MPa, 9.5 MPa, 14 MPa).
[0036] When the width of the spiral guide groove 31 is 0.3 mm, the leakage of the steel cylinder 2 is at its optimal level.
[0037] The same-level magnetic repulsion centering mechanism 4 includes two sets of first permanent magnet rings 41 and two sets of second permanent magnet rings 42. The first permanent magnet rings 41 are vertically arranged and circular in shape, and the two sets of first permanent magnet rings 41 are respectively embedded at both ends of the steel cylinder 2. The second permanent magnet rings 42 are vertically arranged and circular in shape, and both sets of second permanent magnet rings 42 are embedded on the plunger 21. The two sets of second permanent magnet rings 42 are respectively arranged corresponding to the two sets of first permanent magnet rings 41, and the same-level magnetic poles are opposite each other.
[0038] Reference Figure 1 and Figure 2 The sealing mechanism 5 includes a first screw plug 51 and a second screw plug 52. The first screw plug 51 is horizontally inserted into one end of the mounting hole 11 and is threadedly connected to the device body 1. The second screw plug 52 is horizontally inserted into the end of the mounting hole 11 away from the first screw plug 51 and is threadedly connected to the device body 1.
[0039] When the temperature difference in the outdoor environment causes the hydraulic oil to expand and contract, the plunger 21 is located in the middle of the steel cylinder 2. The spiral structure increases the flow path length of the hydraulic oil, and the hydraulic oil in both oil circuits flows slowly and smoothly in both directions. The pressure on both sides of the plunger 21 is the same, thereby achieving pressure difference balance in the steel cylinder 2.
[0040] When the hydraulic oil flows from one side of the plunger 21 to the other side of the plunger 21, the first permanent magnet ring 41 at both ends of the steel cylinder 2 and the second permanent magnet ring 42 on the plunger 21 are set with the same magnetic poles facing each other. The magnetic force of the same poles repelling each other forms a bidirectional repulsive force, and the plunger 21 slides to the middle position of the steel cylinder 2.
[0041] When the motor on the electro-hydraulic switch machine is working, the hydraulic oil flows to one side of the steel cylinder 2, and the plunger 21 slides along the length of the steel cylinder 2. When the plunger 21 slides to one end of the steel cylinder 2, the spiral guide groove 31 is located on one side of the plunger 21, and the plunger 21 isolates the two sides of the steel cylinder 2.
[0042] The implementation principle of the magnetic repulsion centering pressure difference balance structure of the pneumatic cylinder of an electro-hydraulic switch machine according to an embodiment of this application is as follows: In the initial state, the plunger 21 is located in the middle of the steel cylinder 2. When the temperature difference of the outdoor environment causes the hydraulic oil to expand and contract, the micro-channel structure 3 connects the two sets of oil circuit systems 12. The hydraulic oil on both sides of the plunger 21 flows bidirectionally through the micro-channel structure 3. The hydraulic pressure on both sides of the plunger 21 is in the same pressure range. At the same time, the same-level magnetic repulsion centering mechanism 4 drives the plunger 21 to always be in the middle of the steel cylinder 2.
[0043] When the temperature difference in the outdoor environment causes the hydraulic oil to expand and contract, the plunger 21 is located in the middle of the steel cylinder 2. The spiral structure increases the flow path length of the hydraulic oil, and the hydraulic oil in both oil circuits flows slowly and smoothly in both directions. The pressure on both sides of the plunger 21 is the same, thereby achieving pressure difference balance in the steel cylinder 2.
[0044] When the hydraulic oil flows from one side of the plunger 21 to the other side of the plunger 21, the first permanent magnet ring 41 at both ends of the steel cylinder 2 and the second permanent magnet ring 42 on the plunger 21 are set with the same magnetic poles facing each other. The magnetic force of the same poles repelling each other forms a bidirectional repulsive force, and the plunger 21 slides to the middle position of the steel cylinder 2.
[0045] When the motor on the electro-hydraulic switch machine is working, it drives the hydraulic pump station to work. The hydraulic pump station drives the hydraulic oil in the oil tank to flow into the oil inlet 121. The hydraulic oil at the oil inlet 121 flows into the steel cylinder 2 through the first connecting hole 1231 and the gasket pipe 123. When the hydraulic oil flows into the steel cylinder 2, the hydraulic pressure inside the steel cylinder 2 is greater than the magnetic repulsion force of the same level magnetic repulsion centering mechanism 4. The hydraulic oil drives the plunger 21 to move and provide load. The plunger 21 slides along the length of the steel cylinder 2. When the plunger 21 slides to one end of the steel cylinder 2, the spiral guide groove 31 is located on one side of the plunger 21. The plunger 21 isolates the two sides of the steel cylinder 2. The oil outlet 122 of the main machine cylinder and the oil outlet 124 of the auxiliary machine cylinder correspond to different working oil circuits, which meet the requirements of the electro-hydraulic switch machine for turnout switching and locking. When the steel cylinder 2 needs to be disassembled and replaced, the operator screws the first screw plug 51 and the second screw plug 52, and the first screw plug 51 and the second screw plug 52 are disconnected from the equipment body 1. The operator then removes the steel cylinder 2 from the mounting hole 11. Example 2
[0046] Reference Figure 3 The difference between this embodiment and the first embodiment is that the microchannel structure 3 adopts a radial short groove 32, which is opened in the middle of the inner wall of the steel cylinder 2 and is in the shape of a rectangular groove.
[0047] The implementation principle of this embodiment 2 is as follows: When the temperature difference in the outdoor environment causes the hydraulic oil to expand and contract, the plunger 21 is located in the middle of the steel cylinder 2. The radial short groove 32 quickly clears the area with a large local pressure difference in the steel cylinder 2. The radial short groove 32 reduces the flow path length of the hydraulic oil, so that when the pressure difference on both sides of the plunger 21 is large, the hydraulic oil in the oil circuit on both sides can flow quickly. The pressure on both sides of the plunger 21 is the same, thereby achieving pressure balance in the steel cylinder 2.
[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A magnetic repulsion centering pressure difference balancing structure for an electro-hydraulic switch machine's pneumatic cylinder, characterized in that: The device includes a main body (1), a steel cylinder (2), a microchannel structure (3), and a magnetic repulsion centering mechanism (4). The main body (1) is horizontally positioned and has an installation hole (11) on it. Two sets of oil circuit systems (12) are provided on the main body (1). The steel cylinder (2) is located inside the installation hole (11) and is used to connect the two sets of oil circuit systems (12). A plunger (21) is slidably disposed inside the steel cylinder (2) and is used to isolate the two sets of oil circuit systems (12). The microchannel structure (3) is located in the middle of the steel cylinder (2). When the plunger (21) is located in the middle of the steel cylinder (2), the microchannel structure (3) connects the two sets of oil circuit systems (12). The magnetic repulsion centering mechanism (4) is located on the steel cylinder (2) and is used to drive the plunger (21) to be located in the middle position of the steel cylinder (2).
2. The magnetic repulsion centering pressure difference balance structure for the pneumatic cylinder of an electro-hydraulic switch machine according to claim 1, characterized in that: The oil circuit system (12) includes an oil inlet (121) on the equipment body (1), an oil outlet (122) on the main cylinder on the equipment body (1), a gasket (123) in the mounting hole (11), and an oil outlet (124) on the auxiliary cylinder on the equipment body (1); the oil inlet (121), the main cylinder oil outlet (122), and the mounting hole (11) are connected; the gasket (123) is located on one side of the steel cylinder (2), and the gasket (123) is connected to the steel cylinder (2). The side wall of the pad tube (123) is provided with a first connecting hole (1231) and a second connecting hole (1232); the first connecting hole (1231) is located at the connection between the mounting hole (11) and the oil inlet (121); the oil outlet (124) of the auxiliary machine cylinder is connected to the mounting hole (11), and the connection is located at the second connecting hole (1232); a sealing mechanism (5) is provided on the equipment body (1), the sealing mechanism (5) is located in the mounting hole (11), and is used to seal the two sets of pad tubes (123).
3. The magnetic repulsion centering pressure difference balance structure for the pneumatic cylinder of an electro-hydraulic switch machine according to claim 2, characterized in that: The sealing mechanism (5) includes a first screw plug (51) and a second screw plug (52); the first screw plug (51) is inserted into one end of the mounting hole (11) and is threadedly connected to the device body (1); the second screw plug (52) is inserted into one end of the mounting hole (11) away from the first screw plug (51) and is threadedly connected to the device body (1).
4. The magnetic repulsion centering pressure difference balance structure for the pneumatic cylinder of an electro-hydraulic switch machine according to claim 1, characterized in that: The microchannel structure (3) includes a spiral channel (31) located in the middle of the inner wall of the steel cylinder (2).
5. The magnetic repulsion centering pressure difference balance structure for the pneumatic cylinder of an electro-hydraulic switch machine according to claim 1, characterized in that: The microchannel structure (3) includes a radial short groove (32) formed in the middle of the inner wall of the steel cylinder (2).
6. The magnetic repulsion centering pressure difference balance structure for the pneumatic cylinder of an electro-hydraulic switch machine according to claim 1, characterized in that: The same-level magnetic repulsion centering mechanism (4) includes two sets of first permanent magnet rings (41) embedded on the outer wall of the steel cylinder (2) and two sets of second permanent magnet rings (42) embedded on the plunger (21); the two sets of first permanent magnet rings (41) are located at both ends of the steel cylinder (2), and the two sets of second permanent magnet rings (42) are respectively arranged corresponding to the two sets of first permanent magnet rings (41), and the same-level magnetic poles are opposite each other.
7. The magnetic repulsion centering pressure difference balance structure for the pneumatic cylinder of an electro-hydraulic switch machine according to claim 4, characterized in that: The spiral guide groove (31) is provided in multiple spaces along the circumference of the steel cylinder (2).
8. The magnetic repulsion centering pressure difference balance structure for the pneumatic cylinder of an electro-hydraulic switch machine according to claim 4, characterized in that: The width of the spiral guide groove (31) is 0.1 mm to 1.0 mm.
9. The magnetic repulsion centering pressure difference balance structure for the pneumatic cylinder of an electro-hydraulic switch machine according to claim 1, characterized in that: The outer side wall of the steel cylinder (2) is provided with a relief groove (22), and a leak-proof washer (23) is embedded in the relief groove (22). The leak-proof washer (23) abuts against the inner side wall of the mounting hole (11).