Traction protection device for metro vehicle

Abstract

The invention relates to a metro vehicle traction protection device, and belongs to the technical field of rail transit equipment, the metro vehicle traction protection device comprises a machine body and a mounting plate fixed on the left side of the machine body, the mounting plate is provided with a plurality of mounting holes, the right side of the machine body is provided with a traction assembly used for being connected with a carriage, and a limiting seat is fixed in the machine body; a limiting assembly is arranged on the outer side of the end, close to the traction assembly, of the limiting base, and the upper side and the lower side of the limiting base are each provided with a buffering assembly used for limiting the sliding distance. According to the metro vehicle traction protection device, connection is formed between a limiting sliding plate and a machine body through a supporting spring and the limiting sliding plate in the traction assembly, a primary protection structure is formed in the traction process, and a limiting seat is matched with a lifting box and a supporting block to form a secondary protection structure between the limiting sliding plate and a limiting abutting plate; the magnetorheological fluid damper connects the machine body and the limiting abutting plate in the corrugated pipe, a three-time protection structure is formed, and direct impact in the traction process is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of rail transit equipment, in particular to a traction protection device for a subway vehicle. Background Art

[0002] The subway vehicle traction protection device is mainly used to prevent the vehicle from being damaged due to inertia or accidental collision when the subway vehicle is moved by a traction vehicle during subway maintenance, shutdown or shunting operations. It usually absorbs the vehicle's inertia impact through structures such as airbags and springs to avoid direct collision between the traction vehicle and the subway vehicle.

[0003] A Chinese patent with publication number CN221954405U discloses a subway vehicle traction protection device, including a tractor, a clamping structure fixedly installed on the front of the tractor, the clamping structure including a fixed block, a through groove, a threaded tube, an upper baffle, a sealing gasket, a lower baffle and an anti-skid groove, a fixed block fixedly installed on the front of the tractor, a through groove is provided on the upper surface of the fixed block, a threaded tube is fixedly installed inside the through groove, an upper baffle is fixedly installed on one end of the threaded tube, a sealing gasket is movably installed on the upper surface of the upper baffle, a lower baffle is fixedly installed on the other end of the threaded tube, and an anti-skid groove is provided on the lower surface of the lower baffle.

[0004] Although the protective device solves the problem of loose bolts caused by vibration during vehicle traction to a certain extent, the protective device mainly intercepts the subway vehicle through the air pressure inside the airbag, thereby playing a buffering role, and to a certain extent avoids the problem of traditional rigid traction hooks easily causing vehicle collisions. However, this structure that uses springs and airbags to achieve the buffering effect requires frequent replacement of the airbags during long-term use, otherwise the buffering effect will be reduced, and the subsequent maintenance cost will be relatively high. Therefore, a subway vehicle traction protective device is proposed. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a subway vehicle traction protection device, which has the advantages of high stability and good effect, and solves the problems of poor airbag cushioning effect and high maintenance cost of traditional vehicle traction protection devices.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a subway vehicle traction protection device, comprising a body and a mounting plate fixed on the left side of the body, the mounting plate is provided with a plurality of mounting holes, a traction assembly for connecting a carriage is provided on the right side of the body, a limiting seat is fixed inside the body, a limiting assembly is provided on the outer side of the limiting seat near one end of the traction assembly, and a group of buffer assemblies for limiting the sliding distance are provided on the upper and lower sides of the limiting seat.

[0007] Furthermore, the traction assembly includes a connecting frame that passes through the right side of the body and is slidably connected to the body, a traction rod is fixed to the side of the connecting frame located outside the body, a limiting slide is fixed to the side of the connecting frame located inside the body, four hydraulic dampers are fixed to the side of the limiting slide close to the traction rod and are symmetrically distributed up and down, and a support spring is provided on the outside of the hydraulic damper, with both ends respectively fixed to the limiting slide and the body.

[0008] Furthermore, a fixing rod is fixed inside the limit seat, and two limit struts are rotatably connected to the outer side of the fixing rod. A side of the limit seat close to the limit slide is provided with sliding inclined surfaces symmetrically distributed up and down, and through holes are opened on the sliding inclined surfaces. The two limit struts respectively penetrate the corresponding through holes to the outer side of the limit seat.

[0009] Furthermore, the limit assembly includes two lifting boxes slidably connected to the sliding inclined plane, the two lifting boxes are symmetrically distributed up and down with the central axis of the limit seat, the lifting boxes are slidably connected to support blocks, pressure sensors are fixed on the opposite side surfaces of the two support blocks, a telescopic rod is fixed between the two support blocks, and the outer side of the telescopic rod is provided with a contraction spring whose two ends are respectively fixed to the two support blocks.

[0010] Furthermore, the bottom of the lifting box near the limit seat is provided with a chamfer that matches the sliding slope, and an opening that matches the through hole begins on the chamfer. The two limit support rods pass through the upper and lower openings to the outside of the lifting box respectively, and are in contact with the sides opposite to the two support blocks.

[0011] Furthermore, the sides of the lifting box and the support block are slidably connected to the limiting slide, the body is an I-shaped structure and has cavities for limitation inside the upper and lower ends, and the limiting slide is an I-shaped structure embedded in the cavities at the upper and lower ends of the body and is slidably connected to the inner wall of the body.

[0012] Furthermore, an opening is provided on the opposite side of the two lifting boxes, and the opposite ends of the two support blocks pass through the opening to the outside of the lifting box. Sliding grooves for cooperating with the opening are provided on the left and right sides of the support blocks. Through holes are provided on the upper and lower opposite sides of the two lifting boxes, and the telescopic rod and the contraction spring both vertically pass through the through holes.

[0013] Furthermore, the buffer assembly includes three bellows fixed to the inner wall of the left side of the body, and a laterally placed magnetorheological fluid damper is fixed inside the bellows. The upper and lower sides of the limit seat are slidably connected to the limit abutment plate, and the outer side of the bellows is fixed with a spirally distributed coil.

[0014] Furthermore, one end of the three bellows close to the support block is fixedly mounted on the side of the limit stop plate, and the two ends of the magnetorheological fluid damper are respectively fixedly mounted on the left and right inner walls of the bellows.

[0015] Furthermore, the side of the limit stop plate close to the lifting box is slidably connected to the side of the lifting box and the support block respectively, and the opposite sides of the upper and lower limit stop plates are slidably connected to the upper and lower inner walls of the body respectively, and the two ends of the coil are fixedly installed with the limit stop plate and the inner wall of the body respectively.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0017] 1. The subway vehicle traction protection device forms a connection between the limit slide and the body through the support spring and the limit slide inside the traction component, forming a primary protection structure during the traction process. The limit seat cooperates with the lifting box and the support block to form a secondary protection structure between the limit slide and the limit abutment plate to avoid direct impact. The magnetorheological fluid damper connects the body and the limit abutment plate inside the bellows to form a tertiary protection structure, thereby avoiding the problem of direct impact during the traction process to the greatest extent.

[0018] 2. The subway vehicle traction protection device sets a limit seat and a lifting box with a support block between the limit stop plate and the limit slide plate, so that the support block and the lifting box can play different roles in different situations. They can form a protection structure and fill the gaps that appear during the operation to avoid the problem of shaking between parts due to large gaps. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a stereogram of the present invention;

[0020] Figure 2 It is a cross-sectional view of the present invention;

[0021] Figure 3 It is a three-dimensional diagram of the traction assembly of the present invention;

[0022] Figure 4 It is a cross-sectional view of the limiting seat of the present invention;

[0023] Figure 5 This is a connection structure diagram of the limit assembly of the present invention;

[0024] Figure 6 For the present invention Figure 2 A magnified view of the structure in the middle.

[0025] In the figure: 1 body, 2 traction assembly, 21 connecting frame, 22 traction rod, 23 limit slide plate, 24 hydraulic damper, 25 support spring, 3 limit seat, 31 fixing rod, 32 limit support rod, 33 sliding inclined surface, 34 through hole, 4 limit assembly, 41 lifting box, 42 support block, 43 pressure sensor, 44 telescopic rod, 45 contraction spring, 5 buffer assembly, 51 bellows, 52 magnetorheological fluid damper, 53 limit plate, 54 coil, 6 mounting plate. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figures 1 to 2 A subway vehicle traction protection device in this embodiment includes a body 1 and a mounting plate 6 fixed to the left side of the body 1, a plurality of mounting holes are opened on the mounting plate 6, and the mounting plate 6 is fixedly installed on the traction vehicle through nuts or bolts passing through the mounting holes, and a traction component 2 for connecting the carriage is provided on the right side of the body 1, a limiting seat 3 is fixed inside the body 1, and a limiting component 4 is provided on the outer side of the limiting seat 3 close to one end of the traction component 2, and a group of buffer components 5 for limiting the sliding distance are provided on the upper and lower sides of the limiting seat 3.

[0028] See also Figure 3 The traction assembly 2 in this embodiment includes a connecting frame 21 that passes through the right side of the body 1 and is slidably connected to the body 1. The connecting frame 21 can slide on the right side of the body 1 to achieve a telescopic effect. A traction rod 22 is fixed to the side of the connecting frame 21 located outside the body 1. A limiting slide 23 is fixed to the side of the connecting frame 21 located inside the body 1. Four hydraulic dampers 24 symmetrically distributed up and down are fixed to the side of the limiting slide 23 close to the traction rod 22. A support spring 25 is provided on the outer side of the hydraulic damper 24, and two ends are respectively fixedly installed with the limiting slide 23 and the body 1. The hydraulic damper 24 and the support spring 25 form a connection structure to ensure that during the traction process, the traction rod 22 and the body 1 form a synchronous movement.

[0029] It should be noted that a towing hook is connected inside the towing rod 22, and the towing hook is fixed to the front of the vehicle. A connection structure is formed by the towing hook and the towing rod 22, and the locking method of the towing rod 22 and the towing hook is the existing technology.

[0030] See also Figure 4 and 5In order to improve the buffering effect inside the machine body 1, a fixing rod 31 is fixed inside the limiting seat 3 in this embodiment, and two limiting struts 32 are rotatably connected to the outer side of the fixing rod 31. The two limiting struts 32 form an angle with the fixing rod 31 and cooperate with other components respectively. A sliding inclined surface 33 symmetrically distributed up and down is provided on the side of the limiting seat 3 close to the limiting slide plate 23. A through hole 34 is opened on the sliding inclined surface 33. The two limiting struts 32 respectively penetrate the corresponding through holes 34 to the outside of the limiting seat 3, and the limiting struts 32 pass through the limiting seat 3 and the structure inside the limiting component 4 for cooperation.

[0031] In this embodiment, the limiting assembly 4 includes two lifting boxes 41 slidably connected to the sliding inclined surface 33, the two lifting boxes 41 are symmetrically distributed up and down with the central axis of the limiting seat 3, the two lifting boxes 41 form a supporting structure between the limiting seat 3 and the limiting slide plate 23, and a support block 42 is slidably connected to the lifting box 41. The support block 42 fills the interior of the lifting box 41 to improve the pressure bearing capacity of the lifting box 41. Pressure sensors 43 are fixed on the opposite side surfaces of the two support blocks 42. The pressure sensor 43 will squeeze the inner wall of the body 1 after the support block 42 rises a certain distance. A telescopic rod 44 is fixed between the two support blocks 42, and the outer side of the telescopic rod 44 is provided with a contraction spring 45 whose two ends are respectively fixedly installed with the two support blocks 42. The telescopic rod 44 and the contraction spring 45 between the two support blocks 42 limit the distance between the two support blocks 42. At the same time, the support block 42 presses the two lifting boxes 41, so that the lifting box 41 can always be close to the limiting seat 3 under the extrusion of the limiting slide plate 23.

[0032] It should be noted that the inner wall of the lifting box 41 is provided with a buckle for limiting the sliding of the lifting box 41. At the same time, the contact surface between the lifting box 41 and the support block 42 is very smooth and will not affect the mutual movement between the two. In addition, the pressure sensor 43 is connected to the main control module. When the pressure sensor 43 is squeezed by external force, the main control module is activated to control the buffer assembly 5.

[0033] The bottom of the lifting box 41 near the limit seat 3 is provided with a chamfer that matches the sliding inclined surface 33, and an opening that matches the through hole 34 begins to be provided on the chamfer. The two limit struts 32 pass through the upper and lower openings to the outside of the lifting box 41 respectively, and the sides opposite to the two support blocks 42 are both abutted. The top of the limit strut 32 is inserted into the interior of the lifting box 41 through the opening and abuts against the support block 42, so that the limit strut 32 supports the bottom of the support block 42. When the lifting box 41 slides on the sliding inclined surface 33, the side wall of the opening will push the limit strut 32 to rotate, and the rotation of the limit strut 32 can push the support block 42 to move along the inner wall of the lifting box 41, thereby pushing the support block 42 close to the upper and lower side walls of the body 1.

[0034] It should be noted that the opening of the limiting seat 3 will not affect the rotation of the limiting support rod 32 , and the opening side wall of the lifting box 41 will abut against the limiting support rod 32 during the movement, thereby pushing the limiting support rod 32 to rotate.

[0035] The sides of the lifting box 41 and the support block 42 are slidably connected to the limiting slide 23. The body 1 is an I-shaped structure and has cavities for limitation inside the upper and lower ends. The limiting slide 23 is an I-shaped structure embedded in the cavities at the upper and lower ends of the body 1 and is slidably connected to the inner wall of the body 1. The limiting slide 23 of the I-shaped structure slides inside the cavity of the body 1, so that the limiting slide 23 always remains in a vertical state during the sliding process.

[0036] It should be noted that the contact surfaces of the lifting box 41 and the supporting block 42 with the limiting slide plate 23 are smooth, so that they can slide relative to each other smoothly.

[0037] An opening is provided on the opposite side of the two lifting boxes 41, and the opposite ends of the two support blocks 42 pass through the opening to the outside of the lifting box 41. The support block 42 extends to the outside through the opening of the lifting box 41. While the support block 42 supports the lifting box 41 inside the lifting box 41, the support block 42 can move up and down smoothly along the inner wall of the lifting box 41. Sliding grooves that cooperate with the openings are provided on the left and right sides of the support block 42. By setting the sliding grooves to cooperate with the openings of the lifting box 41, the sliding distance of the support block 42 is limited. Through holes are provided on the upper and lower opposite sides of the two lifting boxes 41, and the telescopic rod 44 and the contraction spring 45 both vertically pass through the through holes. The telescopic rod 44 and the contraction spring 45 pass through the two lifting boxes 41 to connect and fix the two support blocks 42 together and limit them to the side of the limit seat 3.

[0038] It should be noted that the limit seat 3 and the limit slide plate 23 respectively support the side of the lifting box 41 on both sides of the lifting box 41, so that the telescopic rod 44 and the contraction spring 45 connect the two support blocks 42, and the inner wall of the sliding groove on the side of the support block 42 will resist the lifting box 41, so that the two lifting boxes 41 are close to the central axis position of the limit seat 3.

[0039] Please refer again Figure 2 and Figure 6 In order to provide lateral support for the limit assembly 4, the buffer assembly 5 in this embodiment includes three bellows 51 fixed to the inner wall of the left side of the body 1. The bellows 51 will shrink when subjected to force. A laterally placed magnetorheological fluid damper 52 is fixed inside the bellows 51. The magnetorheological fluid inside the magnetorheological fluid damper 52 will change its state when subjected to a magnetic field. The upper and lower sides of the limit seat 3 are slidably connected to the limit abutment plate 53. A spirally distributed coil 54 is fixed on the outside of the bellows 51, and the power-on state of the coil 54 is controlled by the main control module.

[0040] It should be noted that the coil 54 is energized under the control of the main control module. The energized coil 54 will form a magnetic field inside the coil 54, so that the magnetorheological fluid inside the magnetorheological fluid damper 52 will change its state under the action of the magnetic field, from a liquid state to a solid state, to prevent the device from further contracting. When the bellows 51 contracts, the coil 54 will contract synchronously and evenly, and will not affect the change in the magnetic field.

[0041] In this embodiment, one end of the three bellows 51 close to the support block 42 is fixedly installed on the side of the limiting plate 53, and the two ends of the magnetorheological fluid damper 52 are respectively fixedly installed on the left and right inner walls of the bellows 51. The bellows 51 and the magnetorheological fluid damper 52 shrink synchronously under the extrusion of the limiting plate 53.

[0042] It should be noted that the expansion and contraction states of the bellows 51 and the magnetorheological fluid damper 52 are synchronized, and the sliding state of the limit stop plate 53 always maintains horizontal movement under the support of the two.

[0043] In this embodiment, the side of the limit plate 53 close to the lifting box 41 is slidably connected to the side of the lifting box 41 and the support block 42 respectively, so that the lifting box 41 and the support block 42 can smoothly slide up and down on the side of the limit plate 53. During the movement of the lifting box 41, the limit plate 53 will be pushed to move horizontally synchronously. The opposite sides of the upper and lower limit plates 53 are slidably connected to the upper and lower inner walls of the body 1 respectively, and the two ends of the coil 54 are fixedly installed with the limit plate 53 and the inner wall of the body 1 respectively.

[0044] It can be understood that during the movement of the limit plate 53, the bellows 51 and the magnetorheological fluid damper 52 will be squeezed to a certain extent. After shrinking to a certain extent, the main control module will energize the coil 54 to adjust the magnetorheological fluid state inside the magnetorheological fluid damper 52 to change in a short period of time, thereby preventing the magnetorheological fluid damper 52 from further shrinking.

[0045] The electrical components appearing in the text are all electrically connected to the controller and the power supply. The control method of the present invention is controlled by the controller. The control circuit of the controller can be implemented by simple programming by technicians in this field. The provision of power supply is also common knowledge in this field. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0046] The working principle of the above embodiment is:

[0047] (1) By connecting the towing rod 22 to the vehicle to be towed, the mounting plate 6 is fixed to the rear of the towing vehicle with bolts. During the operation of the towing vehicle, the vehicle is pulled to move. When the towing vehicle brakes, the speeds of the front and rear vehicles are inconsistent. The vehicle squeezes the towing rod 22 and the connecting frame 21 to squeeze the limit slide 23. When the limit slide 23 is subjected to force, the support spring 25 is pulled to stretch. The hydraulic damper 24 synchronously pulls the body 1 and the limit slide 23 to prevent the limit slide 23 from moving quickly inside the body 1. During the movement of the limit slide 23, the lifting box 41 is squeezed to slide along the sliding slope 33. At this time, the lifting box 41 presses against the limit slide The stop plate 53, after being subjected to force, squeezes the bellows 51 and the magnetorheological fluid damper 52 to shrink. At the same time, the opening on the side of the lifting box 41 presses against the limit support rod 32 to rotate around the fixed rod 31. The rotation of the limit support rod 32 pushes the support block 42 to slide along the inner wall of the lifting box 41. When the support block 42 presses against the upper and lower side walls of the body 1, the pressure sensor 43 monitors the pressure data, and the main control module energizes the coil 54. The state of the magnetorheological fluid inside the magnetorheological fluid damper 52 is changed, and the magnetorheological fluid damper 52 stops shrinking and presses against the limit stop plate 53 to further shrink, thereby reducing the impact force between the vehicle and the tractor, thereby achieving the purpose of protection.

[0048] (2) By installing the device between the tractor and the vehicle, when the tractor accelerates, the speed of the tractor is higher than that of the towed vehicle. Under the pulling of the connecting frame 21, the limit slide plate 23 contracts the support spring 25 and cooperates with the hydraulic damper 24 to respectively press against the body 1 and the limit slide plate 23. The limit slide plate 23 slightly approaches the right inner wall of the body 1. The contraction spring 45 pulls the two support blocks 42 closer to each other along the telescopic rod 44. The approach of the support blocks 42 presses the two lifting boxes 41 to move closer to the center, filling the gap between the limit slide plate 23 and the limit seat 3. The bellows 51 and the magnetorheological fluid damper 52 extend at the same time to push the limit plate 53 to continuously press against the lifting box 41 and the support block 42, thereby preventing the limit slide plate 23 from shaking left and right during the acceleration of the tractor, driving the connecting frame 21 and the traction rod 22 to shake, causing vibration during the traction process.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0050] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A subway vehicle traction protection device, comprising a body (1) and a mounting plate (6) fixed to the left side of the body (1), wherein the mounting plate (6) is provided with a plurality of mounting holes, characterized in that: The right side of the machine body (1) is provided with a traction assembly (2) for connecting to a carriage, a limiting seat (3) is fixed inside the machine body (1), a limiting assembly (4) is arranged on the outer side of the limiting seat (3) close to one end of the traction assembly (2), and a group of buffer assemblies (5) for limiting the sliding distance are arranged on both upper and lower sides of the limiting seat (3).

2. A subway vehicle traction protection device according to claim 1, characterized in that: The traction assembly (2) comprises a connecting frame (21) penetrating the right side of the machine body (1) and slidably connected to the machine body (1); a traction rod (22) is fixed to the side of the connecting frame (21) located outside the machine body (1); a limiting slide plate (23) is fixed to the side of the connecting frame (21) located inside the machine body (1); four hydraulic dampers (24) are fixed to the side of the limiting slide plate (23) close to the traction rod (22) and symmetrically distributed up and down; and a support spring (25) is provided on the outer side of the hydraulic damper (24), with two ends respectively fixedly mounted to the limiting slide plate (23) and the machine body (1).

3. A subway vehicle traction protection device according to claim 2, characterized in that: A fixing rod (31) is fixed inside the limiting seat (3), and two limiting struts (32) are rotatably connected to the outer side of the fixing rod (31). A sliding inclined surface (33) symmetrically distributed up and down is provided on the side of the limiting seat (3) close to the limiting slide plate (23), and a through hole (34) is opened on the sliding inclined surface (33). The two limiting struts (32) respectively penetrate the corresponding through holes (34) to the outer side of the limiting seat (3).

4. A subway vehicle traction protection device according to claim 3, characterized in that: The limit assembly (4) comprises two lifting boxes (41) slidably connected to the sliding inclined surface (33), the two lifting boxes (41) are symmetrically distributed up and down with respect to the central axis of the limit seat (3), the lifting boxes (41) are slidably connected to support blocks (42), the surfaces of the two support blocks (42) opposite to each other are both fixed with pressure sensors (43), a telescopic rod (44) is fixed between the two support blocks (42), and a contraction spring (45) is provided on the outer side of the telescopic rod (44), the two ends of which are respectively fixedly mounted on the two support blocks (42).

5. A subway vehicle traction protection device according to claim 4, characterized in that: The bottom of one side of the lifting box (41) close to the limiting seat (3) is provided with a chamfer that matches the sliding inclined surface (33), and an opening that matches the through hole (34) begins on the chamfer. The two limiting support rods (32) pass through the upper and lower openings to the outside of the lifting box (41) respectively, and the sides opposite to the two support blocks (42) are both in contact.

6. A subway vehicle traction protection device according to claim 5, characterized in that: The sides of the lifting box (41) and the supporting block (42) are slidably connected to the limiting slide plate (23); the machine body (1) is an I-shaped structure and has cavities for limiting inside at both ends; the limiting slide plate (23) is an I-shaped structure embedded in the cavities at the upper and lower ends of the machine body (1) and is slidably connected to the inner wall of the machine body (1).

7. A subway vehicle traction protection device according to claim 6, characterized in that: An opening is provided on the opposite side of the two lifting boxes (41), and the opposite ends of the two support blocks (42) penetrate the opening to the outside of the lifting box (41). The left and right sides of the support blocks (42) are provided with sliding grooves for matching with the opening. The upper and lower opposite sides of the two lifting boxes (41) are both provided with through holes, and the telescopic rod (44) and the contraction spring (45) are both vertically passed through the through holes.

8. A subway vehicle traction protection device according to claim 7, characterized in that: The buffer assembly (5) comprises three bellows (51) fixed to the inner wall of the left side of the machine body (1), each of the bellows (51) having a transversely placed magnetorheological fluid damper (52) fixed therein, the upper and lower sides of the limit seat (3) being slidably connected to a limit stop plate (53), and the outer side of each of the bellows (51) having a spirally distributed coil (54) fixed thereon.

9. A subway vehicle traction protection device according to claim 8, characterized in that: One end of the three bellows (51) close to the support block (42) is fixedly mounted on the side of the limit stop plate (53), and the two ends of the magnetorheological fluid damper (52) are respectively fixedly mounted on the left and right inner side walls of the bellows (51).

10. A subway vehicle traction protection device according to claim 9, characterized in that: The side of the limit stop plate (53) close to the lifting box (41) is slidably connected to the side of the lifting box (41) and the support block (42), and the sides of the upper and lower limit stop plates (53) facing away from each other are slidably connected to the upper and lower inner walls of the machine body (1), respectively. The two ends of the coil (54) are fixedly mounted to the limit stop plate (53) and the inner wall of the machine body (1), respectively.

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