Anti-snaking shock absorber for rail transit

Abstract

The anti-snaking shock absorber comprises an oil storage cylinder barrel, a guide cover assembly is fixedly installed at the left end of an inner cavity of the oil storage cylinder barrel, an oil channel is formed in the upper end of the right side of the guide cover assembly, an oil return valve is fixedly installed at the middle end of the oil channel, and an air channel is formed in the lower end of the right side of the guide cover assembly. A one-way valve is fixedly installed at the lower end of the air channel. Oil in the oil storage cylinder barrel is communicated with oil in the stretching cavity of the working cylinder barrel through the oil return valve and the oil duct, so that when the anti-snakelike shock absorber is in the compression stage to the stretching stage, oil can be supplemented in time when the oil in the stretching cavity is insufficient, and the service life of the anti-snakelike shock absorber is prolonged. The situation that the piston rod occupies a part of space, so that the volume change between the stretching cavity and the compression cavity is inconsistent, and then the stretching cavity is lack of oil and generates vacuum is effectively avoided, the working reliability of the shock absorber is greatly improved through the design, and the stability and safety of a rail transit vehicle during running are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of shock absorbers, and specifically to an anti-hunting shock absorber for rail transit. Background Art

[0002] As one of the key suspension components to improve the hunting stability of the whole vehicle, the anti-hunting shock absorber can effectively suppress hunting motion, increase the critical speed when hunting vibration occurs. One end of it is connected to the car body and the other end is connected to the bogie frame. By providing effective stiffness and damping, the mechanical energy of vehicle vibration is converted into heat energy to attenuate the hunting motion of the bogie and the car body, so as to achieve the purpose of suppressing the hunting motion of the bogie and ensure the running safety of locomotives and vehicles. The performance stability of the anti-hunting shock absorber is crucial. Once there is a situation of unstable performance or failure, there may be a risk of vehicle derailment, seriously affecting the train operation safety.

[0003] However, there are many problems to be solved urgently in the current anti-hunting shock absorbers. First of all, in the compression stage, the tensile chamber formed between the piston and the guide cover is prone to insufficient oil and vacuum generation; in addition, the contact area between the internal oil and air is relatively large, and the air in the oil storage cylinder is extremely easy to enter the oil and generate bubbles during the oil circulation process. When the oil containing bubbles is sucked into the inside of the working cylinder, it will make the performance of the shock absorber unstable; secondly, when the shock absorber is subjected to high-frequency excitation, the valve system inside the piston is prone to tremor phenomenon, thus affecting the performance of the shock absorber. Summary of the Invention

[0004] The purpose of the present invention is to provide an anti-hunting shock absorber for rail transit, which has the advantages of effectively preventing oil shortage when the shock absorber transfers from compression to tension stage, avoiding the generation of bubbles in the oil, and preventing the valve system from tremoring when the shock absorber is subjected to high-frequency vibration, effectively ensuring the service performance of the shock absorber.

[0005] To achieve the above object, the present invention provides the following technical solution: An anti-hunting shock absorber for rail transit, comprising an oil storage cylinder barrel, a guide cover assembly is fixedly installed at the left end of the inner cavity of the oil storage cylinder barrel, an oil passage is opened at the upper end on the right side of the guide cover assembly, a return oil valve is fixedly installed in the middle of the oil passage, an air passage is opened at the lower end on the right side of the guide cover assembly, a one-way valve is fixedly installed at the lower end of the air passage, a breather steel is fixedly installed at the upper end of the air passage, a piston rod is slidably connected to the middle of the guide cover assembly, a dust cover hanger is fixedly installed on the left side of the piston rod, a piston assembly is fixedly installed on the right end of the piston rod, a tension damping valve is fixedly installed at the upper end of the piston assembly, a compression damping valve is fixedly installed at the lower end of the piston assembly, a working cylinder barrel is fixedly installed between the peripheries on the right side of the guide cover assembly, the surface of the piston assembly is slidably connected to the inner cavity of the working cylinder barrel, a bottom valve assembly is fixedly installed on the right side of the working cylinder barrel, a bottom valve damping valve is fixedly installed in the middle of the bottom valve assembly, an oil hole is opened on the surface of the bottom valve assembly, a valve stop is in contact with the right side of the inner cavity of the bottom valve assembly, and a conical spring is in contact with the left side of the valve stop.

[0006] As a preferred solution, a circlip is clamped at the left end of the inner cavity of the bottom valve assembly, a retaining piece is in contact between the right side of the circlip and the left side of the conical spring, the surface of the retaining piece is sleeved on the left end of the inner cavity of the bottom valve assembly, and the shape of the retaining piece is annular.

[0007] As a preferred solution, a dust cover cylinder is fixedly installed between the peripheries of the dust cover hanger, an external bellows is sleeved between the outer surface of the dust cover cylinder and the outer surface of the oil storage cylinder barrel, and metal hose clamps are sleeved at both ends of the external bellows.

[0008] As a preferred solution, a tension unloading valve is fixedly installed at the upper end of the piston assembly and below the tension damping valve, a compression unloading valve is fixedly installed at the lower end of the piston assembly and above the compression damping valve, the number of the tension damping valve and the compression damping valve is one each, and the number of the tension unloading valve and the compression unloading valve is two each.

[0009] As a preferred solution, a guide oil pipe is fixedly installed at the upper end of the oil passage, and a through hole is opened at the right end of the guide oil pipe.

[0010] As a preferred solution, a first rubber ring is fixedly installed between the peripheries of the guide cover assembly, the surface of the first rubber ring is in contact with the left end of the inner cavity of the oil storage cylinder barrel, a second rubber ring is fixedly installed between the peripheries of the bottom valve assembly, and the surface of the second rubber ring is in contact with the right end of the inner cavity of the working cylinder barrel.

[0011] As a preferred solution, an oil seal is fixedly installed at the middle of the guide cover assembly, and the surface of the piston rod is slidably connected to the surface of the oil seal.

[0012] As a preferred solution, piston rings are fixedly installed at both ends of the piston assembly. The surface of the piston ring is slidably connected to the inner cavity of the working cylinder barrel. A Gleitring is fixedly installed in the middle of the piston assembly, and the surface of the Gleitring is slidably connected to the inner cavity of the working cylinder barrel.

[0013] As a preferred solution, a rubber node one is sleeved at the left end of the dust cover lifting ring, and a first mounting member is fixedly connected to the middle of the rubber node one.

[0014] As a preferred solution, a bottom barrel lifting ring is fixedly installed between the right side of the oil storage cylinder barrel and the right side of the bottom valve assembly. A rubber node two is sleeved at the right end of the bottom barrel lifting ring, and a second mounting member is fixedly connected to the middle of the rubber node two.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention connects the oil in the oil storage cylinder barrel with the oil in the stretching cavity of the working cylinder barrel through an oil return valve and an oil passage, so that when the anti-snake vibration damper transfers from compression to stretching, when the stretching cavity lacks oil, it can make up for the oil in time, effectively avoiding the inconsistent volume change between the stretching cavity and the compression cavity caused by the piston rod occupying part of the space, and further avoiding the situation of lack of oil and vacuum generation in the stretching cavity. This design greatly improves the working reliability of the damper and ensures the smoothness and safety of the rail transit vehicle during operation. Secondly, through the design of connecting the breathable steel and the one-way valve, the air bubbles in the oil in the working cylinder barrel can be discharged, improving the situation that the contact area between the internal oil and air is large in the past, and the air in the oil storage cylinder barrel is easily sucked into the oil to generate bubbles during the oil circulation process, avoiding the unstable overall performance caused by the oil containing bubbles being sucked into the internal of the working cylinder barrel, enabling the anti-snake vibration damper to continuously and stably play the damping role, and effectively preventing the cavitation phenomenon caused by the rupture of air bubbles, protecting the internal structure from damage, extending the overall service life and reducing the maintenance cost. In addition, by improving the valve train structure in the piston assembly and fully optimizing the valve train, the movement path of the valve train can be fixed, restricting the non-axial movement of the valve train, effectively solving the tremor phenomenon that the valve train is prone to generate under high-frequency vibration. This enables the anti-snake vibration damper to maintain good performance under high-frequency excitation conditions, improving the adaptability to complex operating environments, providing more reliable damping protection for the rail transit vehicle at high speed or in complex road conditions, and further improving the safety and comfort of vehicle operation.

[0016] Through the arrangement of the circlip and the retaining plate, the present invention can limit the position between the left side of the conical spring and the inner cavity of the bottom valve assembly, preventing the conical spring from detaching from the inside of the bottom valve assembly. Through the arrangement of the dust cover cylinder and the external bellows, a good dust-proof protection can be formed between the dust cover lifting ring and the periphery of the oil storage cylinder, preventing dust or foreign objects from entering and aggravating the wear of the piston rod, and reducing the probability of oil leakage. Through the arrangement of the metal hose clamp, the two ends of the external bellows can be fixed, preventing the external bellows from falling off during use. Through the arrangement of the tensile unloading valve and the compression unloading valve, when the shock absorber undergoes a tensile stroke or a compression stroke, if the excitation received is too large, the tensile unloading valve or the compression unloading valve on the piston assembly will open for unloading operations, preventing the anti-snake shock absorber from being damaged and extending the overall service life.

[0017] Through the arrangement of the first rubber ring and the second rubber ring, the present invention effectively improves the sealing performance of the contact between the guide cap assembly and the oil storage cylinder, and between the bottom valve assembly and the working cylinder, reducing the probability of oil leakage. Through the arrangement of the oil seal, the sealing performance of the contact between the piston rod and the guide cap assembly during movement is effectively improved, reducing the probability of oil leakage. Through the arrangement of the piston ring and the Gleitring, the sealing performance of the contact between the piston assembly and the working cylinder is effectively improved, preventing oil from leaking through the gaps around the piston assembly during the use of the shock absorber.

[0018] Through the arrangement of the rubber node one, the first mounting member, the rubber node two and the second mounting member, the present invention facilitates the installation and fixation of the shock absorber between the vehicle body and the bogie by personnel using fasteners. Brief Description of the Drawings

[0019] Figure 1 is a perspective view of the present invention; Figure 2 is a front sectional structural schematic diagram of the present invention; Figure 3 is a structural schematic diagram of the piston assembly of the present invention; Figure 4 is a structural schematic diagram of the bottom valve assembly of the present invention; Figure 5 is a sectional structural schematic diagram of the guide cap assembly of the present invention; Figure 6 is a sectional structural schematic diagram of the bottom valve assembly of the present invention.

[0020] In the figure: 1. Dust-proof cover cylinder body; 2. Metal hose clamp; 3. External corrugated pipe; 4. Oil storage cylinder barrel; 5. First mounting part; 6. Dust-proof cover lifting ring; 7. Rubber joint one; 8. Second mounting part; 9. Rubber joint two; 10. Bottom cylinder lifting ring; 11. Piston rod; 12. First rubber ring; 13. Guide cover assembly; 14. Oil guide pipe; 15. Piston ring; 16. Piston assembly; 17. Working cylinder barrel; 18. Second rubber ring; 19. Bottom valve assembly; 20. Tensile damping valve; 21. Tensile unloading valve; 22. Compression unloading valve; 23. Compression damping valve; 24. Bottom valve damping valve; 25. Oil hole; 26. Return oil valve; 27. Oil seal; 28. Check valve; 29. Air passage; 30. Breathable steel; 31. Snap ring; 32. Retaining piece; 33. Conical spring; 34. Valve stopper; 35. Oil passage. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that can be included in at least one implementation manner of the present invention. The "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that excludes other embodiments.

[0023] Embodiment 1, please refer to Figures 1 - 6As shown in the figure, the present invention provides an anti-hunting shock absorber for rail transit, which includes a storage oil cylinder 4. At the left end of the inner cavity of the storage oil cylinder 4, a guide cover assembly 13 is fixedly installed. An oil passage 35 is opened at the upper end on the right side of the guide cover assembly 13. A return oil valve 26 is fixedly installed in the middle of the oil passage 35. An air passage 29 is opened at the lower end on the right side of the guide cover assembly 13. A one-way valve 28 is fixedly installed at the lower end of the air passage 29. A breather steel 30 is fixedly installed at the upper end of the air passage 29. A piston rod 11 is slidably connected to the middle of the guide cover assembly 13. A dust cover hanger 6 is fixedly installed on the left side of the piston rod 11. A piston assembly 16 is fixedly installed at the right end of the piston rod 11. A tension damping valve 20 is fixedly installed at the upper end of the piston assembly 16. A compression damping valve 23 is fixedly installed at the lower end of the piston assembly 16. A working cylinder 17 is fixedly installed between the four sides on the right side of the guide cover assembly 13. The surface of the piston assembly 16 is slidably connected to the inner cavity of the working cylinder 17. A bottom valve assembly 19 is fixedly installed on the right side of the working cylinder 17. A bottom valve damping valve 24 is fixedly installed in the middle of the bottom valve assembly 19. An oil hole 25 is opened on the surface of the bottom valve assembly 19. A valve stop 34 is in contact with the right side of the inner cavity of the bottom valve assembly 19. A conical spring 33 is in contact with the left side of the valve stop 34.

[0024] In this technical solution, the oil in the storage oil cylinder 4 is communicated with the oil in the stretching cavity of the working cylinder 17 through the return oil valve 26 and the oil passage 35. When the anti-hunting shock absorber transfers from compression to stretching, when there is insufficient oil in the stretching cavity, oil can be replenished in time, effectively avoiding the inconsistent volume change between the stretching cavity and the compression cavity caused by the piston rod 11 occupying part of the space, and further avoiding the situation of oil shortage and vacuum generation in the stretching cavity. This design greatly improves the working reliability of the shock absorber and ensures the smoothness and safety of the rail transit vehicle during operation. Secondly, through the design of the breather steel 30 and the one-way valve 28 cooperating with each other, the bubbles in the oil in the working cylinder 17 can be discharged, improving the situation that the contact area between the internal oil and air is large in the past, and air in the storage oil cylinder 4 is easily introduced into the oil to generate bubbles during the oil circulation process, avoiding the situation that the oil containing bubbles is sucked into the internal of the working cylinder 17 and resulting in unstable overall performance, enabling the anti-hunting shock absorber to continuously and stably play the shock absorption role. At the same time, it also effectively prevents the cavitation phenomenon caused by the rupture of bubbles, protects the internal structure from damage, extends the overall service life, and reduces the maintenance cost. In addition, through the improvement of the valve system structure in the piston assembly 16, after the valve system is fully optimized, the movement path of the valve system can be fixed, and the non-axial movement of the valve system can be restricted, effectively solving the tremor phenomenon that the valve system is prone to occur under high-frequency vibration. This enables the anti-hunting shock absorber to maintain good performance under high-frequency excitation conditions, improves the adaptability to complex operating environments, provides more reliable shock absorption guarantee for rail transit vehicles at high speeds or under complex road conditions, and further improves the safety and comfort of vehicle operation.

[0025] Embodiment 2. On the basis of Embodiment 1, as shown in Figure 1 , Figure 2 , Figure 3 and Figure 5 , it is disclosed that a snap ring 31 is clamped at the left end of the inner cavity of the bottom valve assembly 19. A retaining plate 32 is in contact between the right side of the snap ring 31 and the left side of the conical spring 33. The surface of the retaining plate 32 is sleeved on the left end of the inner cavity of the bottom valve assembly 19. The shape of the retaining plate 32 is annular. A dust cover cylinder 1 is fixedly installed between the peripheries of the dust cover suspension rings 6. An external bellows 3 is sleeved between the outer surface of the dust cover cylinder 1 and the outer surface of the oil storage cylinder 4. Metal hose clamps 2 are sleeved at both ends of the external bellows 3. A tension relief valve 21 is fixedly installed above the upper end of the piston assembly 16 and below the tension damping valve 20. A compression relief valve 22 is fixedly installed below the lower end of the piston assembly 16 and above the compression damping valve 23. The number of the tension damping valve 20 and the compression damping valve 23 is one each, and the number of the tension relief valve 21 and the compression relief valve 22 is two each. A guide oil pipe 14 is fixedly installed at the upper end of the oil passage 35, and a through hole is opened at the right end of the guide oil pipe 14.

[0026] In this technical solution, through the arrangement of the snap ring 31 and the retaining plate 32, the left side of the conical spring 33 can be limited with the inner cavity of the bottom valve assembly 19 to prevent the conical spring 33 from disengaging from the inside of the bottom valve assembly 19. Through the arrangement of the dust cover cylinder 1 and the external bellows 3, good dust protection can be formed between the dust cover suspension rings 6 and the periphery of the oil storage cylinder 4, preventing dust or foreign objects from entering and aggravating the wear of the piston rod 11, and reducing the probability of oil leakage. Through the arrangement of the metal hose clamps 2, both ends of the external bellows 3 can be fixed to prevent the external bellows 3 from falling off during use. Through the arrangement of the tension relief valve 21 and the compression relief valve 22, when the shock absorber performs a tensile stroke or a compression stroke, if the excitation received is too large, the tension relief valve 21 or the compression relief valve 22 on the piston assembly 16 will open for unloading operation, preventing the anti-snake shock absorber from being damaged and extending the overall service life.

[0027] Embodiment 3. On the basis of Embodiment 1, as shown in Figures 2 - 6As shown, a first rubber ring 12 is fixedly installed between the peripheries of the guide cover assembly 13, and the surface of the first rubber ring 12 contacts the left end of the inner cavity of the oil storage cylinder barrel 4. A second rubber ring 18 is fixedly installed between the peripheries of the bottom valve assembly 19, and the surface of the second rubber ring 18 contacts the right end of the inner cavity of the working cylinder barrel 17. An oil seal 27 is fixedly installed at the middle end of the guide cover assembly 13, and the surface of the piston rod 11 is slidably connected to the surface of the oil seal 27. Piston rings 15 are fixedly installed at both ends of the piston assembly 16, and the surface of the piston rings 15 is slidably connected to the inner cavity of the working cylinder barrel 17. A Gleitring is fixedly installed at the middle end of the piston assembly 16, and the surface of the Gleitring is slidably connected to the inner cavity of the working cylinder barrel 17.

[0028] In this technical solution, through the arrangement of the first rubber ring 12 and the second rubber ring 18, the sealing performance of the contact between the guide cover assembly 13 and the oil storage cylinder barrel 4, and between the bottom valve assembly 19 and the working cylinder barrel 17 is effectively improved, reducing the probability of oil leakage. Through the arrangement of the oil seal 27, the sealing performance of the contact between the piston rod 11 and the guide cover assembly 13 during the movement of the piston rod 11 is effectively improved, reducing the probability of oil leakage. Through the arrangement of the piston rings 15 and the Gleitring, the sealing performance of the contact between the piston assembly 16 and the working cylinder barrel 17 is effectively improved, preventing oil from leaking through the gaps around the piston assembly 16 during the use of the shock absorber.

[0029] Embodiment 4, on the basis of Embodiment 1, as shown in Figure 1 and Figure 2 As shown, a rubber node one 7 is sleeved on the left end of the dust cover suspension ring 6, a first mounting member 5 is fixedly connected to the middle end of the rubber node one 7, a cylinder bottom suspension ring 10 is fixedly installed between the right side of the oil storage cylinder barrel 4 and the right side of the bottom valve assembly 19, a rubber node two 9 is sleeved on the right end of the cylinder bottom suspension ring 10, and a second mounting member 8 is fixedly connected to the middle end of the rubber node two 9.

[0030] In this technical solution, through the arrangement of the rubber node one 7, the first mounting member 5, the rubber node two 9 and the second mounting member 8, it is convenient for personnel to install and fix this shock absorber between the vehicle body and the bogie using fasteners.

[0031] The working principle of the present invention is as follows: The anti-hunting damper of the present invention is connected between the car body and the bogie. When the anti-hunting damper is in the tensile stroke, the piston rod 11 pulls the piston assembly 16 to move towards the guide cover assembly 13. After the piston assembly 16 moves, a negative pressure is formed in the compression chamber on the right side. And the pressure in the tensile chamber located on the left side of the piston assembly 16 and inside the working cylinder 17 is greater than the pressure in the compression chamber. The pressure in the oil storage cylinder 4 is greater than the pressure in the compression chamber. The oil fluid flows into the compression chamber after throttling through the tensile damping valve 20 on the piston assembly 16. And the piston assembly 16 moves along the tensile direction. The reduced volume of the tensile chamber is smaller than the increased volume of the compression chamber. Therefore, the oil fluid in the oil storage cylinder 4 pushes the valve stopper 34 and the conical spring 33 through the oil hole 25 on the bottom valve assembly 19 under the action of pressure and flows into the compression chamber to supplement a part of the oil fluid to prevent the formation of a compression cavity. In addition, the gas in the tensile chamber will be discharged through the breathable steel 30 and the one-way valve 28 inside the air passage 29. At the same time, by setting the one-way valve 28, it is prevented that the negative pressure formed in the tensile chamber during the compression stage of the product sucks external air back into the working chamber, forming a one-way exhaust path, avoiding the long-term filling of oil fluid with bubbles in the working chamber, reducing the probability of oil fluid emulsification, enabling the anti-hunting damper of the present invention to continuously and stably exert its damping effect. At the same time, it also effectively prevents the cavitation phenomenon caused by the rupture of bubbles, protects the internal structure from damage, extends the overall service life, and reduces the maintenance cost. When the anti-hunting damper is in the compression stroke, the piston assembly 16 moves towards the bottom valve assembly 19. The pressure inside the compression chamber located on the right side of the piston assembly 16 inside the working cylinder 17 is greater than the pressure inside the tensile chamber on the left side of the piston assembly 16 and the pressure in the oil storage cylinder 4. At this time, the valve stopper 34 on the bottom valve assembly 19 is closed. Part of the oil fluid flows into the tensile chamber after throttling through the compression damping valve 23 on the piston assembly 16, and the other part flows into the oil storage cylinder 4 after throttling through the bottom valve damping valve 24 on the bottom valve assembly 19. In addition, during the compression stroke of the anti-hunting damper, it is easy for the oil fluid to flow back to the oil storage cylinder 4 too much, resulting in a vacuum in the tensile chamber due to insufficient oil fluid. And under the action of the oil return valve 26 and the oil passage 35, the oil fluid in the oil storage cylinder 4 can be connected with the oil fluid in the tensile chamber of the working cylinder 17. If there is insufficient oil fluid in the tensile chamber, the oil fluid inside the oil storage cylinder 4 will enter the tensile area of the working cylinder 17.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An anti-snaking shock absorber for rail transit, comprising an oil storage cylinder (4), characterized in that: A guide cover assembly (13) is fixedly mounted on the left end of the inner cavity of the oil storage cylinder (4); an oil passage (35) is provided at the upper end of the right side of the guide cover assembly (13); an oil return valve (26) is fixedly mounted at the middle end of the oil passage (35); an air passage (29) is provided at the lower end of the right side of the guide cover assembly (13); a check valve (28) is fixedly mounted at the lower end of the air passage (29); a breathable steel (30) is fixedly mounted at the upper end of the air passage (29); a piston rod (11) is slidably connected to the middle end of the guide cover assembly (13); a dust cover lifting ring (6) is fixedly mounted on the left side of the piston rod (11); a piston assembly (16) is fixedly mounted on the right end of the piston rod (11); and the piston assembly (16) is fixedly mounted on the right end of the piston rod (11). A tension damping valve (20) is fixedly mounted on the upper end of the piston assembly (16), a compression damping valve (23) is fixedly mounted on the lower end of the piston assembly (16), a working cylinder (17) is fixedly mounted around the right side of the guide cover assembly (13), the surface of the piston assembly (16) is slidably connected to the inner cavity of the working cylinder (17), a bottom valve assembly (19) is fixedly mounted on the right side of the working cylinder (17), a bottom valve damping valve (24) is fixedly mounted on the middle end of the bottom valve assembly (19), an oil hole (25) is provided on the surface of the bottom valve assembly (19), the right side of the inner cavity of the bottom valve assembly (19) contacts a valve stopper (34), and the left side of the valve stopper (34) contacts a conical spring (33).

2. The anti-snaking shock absorber for rail transit according to claim 1, characterized in that: A retaining spring (31) is clamped at the left end of the inner cavity of the bottom valve assembly (19), a baffle (32) is in contact between the right side of the retaining spring (31) and the left side of the conical spring (33), a surface of the baffle (32) is sleeved on the left end of the inner cavity of the bottom valve assembly (19), and the baffle (32) is annular in shape.

3. The anti-snaking shock absorber for rail transit according to claim 1, characterized in that: A dust cover cylinder (1) is fixedly mounted around the dust cover lifting ring (6), an external bellows (3) is sleeved between the outer surface of the dust cover cylinder (1) and the outer surface of the oil storage cylinder (4), and metal hose clamps (2) are sleeved at both ends of the external bellows (3).

4. The anti-snaking shock absorber for rail transit according to claim 1, characterized in that: A tension relief valve (21) is fixedly mounted on the upper end of the piston assembly (16) and located below the tension damping valve (20), and a compression relief valve (22) is fixedly mounted on the lower end of the piston assembly (16) and located above the compression damping valve (23). The number of the tension damping valve (20) and the number of the compression damping valve (23) are both one, and the number of the tension relief valve (21) and the number of the compression relief valve (22) are both two.

5. The anti-snaking shock absorber for rail transit according to claim 1, characterized in that: An oil guide pipe (14) is fixedly mounted on the upper end of the oil passage (35), and a through hole is formed at the right end of the oil guide pipe (14).

6. The anti-snaking shock absorber for rail transit according to claim 1, characterized in that: A first rubber ring (12) is fixedly mounted around the guide cover assembly (13), and a surface of the first rubber ring (12) contacts the left end of the inner cavity of the oil storage cylinder barrel (4). A second rubber ring (18) is fixedly mounted around the bottom valve assembly (19), and a surface of the second rubber ring (18) contacts the right end of the inner cavity of the working cylinder barrel (17).

7. The anti-snaking shock absorber for rail transit according to claim 1, characterized in that: An oil seal (27) is fixedly mounted on the middle end of the guide cover assembly (13), and the surface of the piston rod (11) is slidably connected to the surface of the oil seal (27).

8. The anti-snaking shock absorber for rail transit according to claim 1, characterized in that: Piston rings (15) are fixedly mounted on both ends of the piston assembly (16), and the surface of the piston ring (15) is slidably connected to the inner cavity of the working cylinder barrel (17). A Gly ring is fixedly mounted on the middle end of the piston assembly (16), and the surface of the Gly ring is slidably connected to the inner cavity of the working cylinder barrel (17).

9. The anti-snaking shock absorber for rail transit according to claim 1, characterized in that: The left end of the dust cover lifting ring (6) is sleeved with a rubber node 1 (7), and the middle end of the rubber node 1 (7) is fixedly connected to a first mounting member (5).

10. The anti-snaking shock absorber for rail transit according to claim 1, characterized in that: A cylinder bottom lifting ring (10) is fixedly installed between the right side of the oil storage cylinder (4) and the right side of the bottom valve assembly (19), a rubber node 2 (9) is sleeved on the right end of the cylinder bottom lifting ring (10), and a second mounting member (8) is fixedly connected to the middle end of the rubber node 2 (9).

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