Rail transit passenger car seat backrest sand bag swing impact test device

Abstract

The invention provides a swing impact test device for a sand bag of a seat backrest of a rail transit passenger car. The swing impact test device comprises a test bed, a support frame, a lifting assembly, a support cross beam and a swing impact assembly, the test bed is used for installing a seat, the lifting assembly is arranged on the supporting frame, the supporting cross beam and the supporting frame are arranged in a sliding mode, and the lifting assembly drives the supporting cross beam to move in a lifting mode; the swing impact assembly comprises a connecting beam, a swing arm, a pendulum bob, a pull rope and a pull driving source. The connecting beam is connected with the supporting cross beam, the swing arm is hinged to the connecting beam, the pendulum bob is connected with one end of the swing arm, and the pull rope is connected with the other end of the swing arm. And the pull driving source pulls the pull rope, so that the pendulum bob impacts the backrest of the seat. According to the invention, impact tests can be conveniently carried out on different heights of the seat backrest.

Description

Technical Field

[0001] The present application relates to the technical field of testing devices, and in particular to a sandbag swing impact testing device for a rail transit coach seat backrest. Background Art

[0002] After the production of rail transit coach seats is completed, they need to undergo a stiffness test, which is designed to evaluate the stability and reliability of the seats under various external forces during actual use. Generally, the test is performed by externally impacting the seat back to evaluate the impact resistance of the seat back.

[0003] At present, the impact performance test of seat backs in related technologies generally adopts the natural falling impact of heavy objects or the impact of pendulums on seat backs. The adjustment for the impact at different heights of seat backs is not flexible enough, resulting in the inability to efficiently complete more comprehensive tests at various heights of seat backs, and the inability to test multiple points quickly and continuously. Summary of the invention

[0004] In order to facilitate impact testing of seat backs at different heights, the present application provides a sandbag swing impact test device for a rail transit coach seat back.

[0005] The present application provides a rail transit passenger car seat back sandbag swing impact test device, which adopts the following technical solution: A rail transit passenger car seat back sandbag swing impact test device, comprising a test bench, a support frame, a lifting assembly, a support beam and a swing impact assembly; the test bench is used to install the seat, the lifting assembly is arranged on the support frame, the support beam is slidably arranged with the support frame, and the lifting assembly drives the support beam to move up and down; The swing impact assembly includes a connecting beam, a swing arm, a pendulum, a pull rope and a pulling drive source; the connecting beam is connected to the supporting crossbeam, the swing arm is hinged to the connecting beam, the pendulum is connected to one end of the swing arm, and the pull rope is connected to the other end of the swing arm; the pulling drive source pulls the pull rope to cause the pendulum to impact the seat back.

[0006] By adopting the above technical solution, the lifting assembly can drive the support beam to move up and down, realizing flexible adjustment of the pendulum impact height, ensuring that comprehensive testing can be performed for different heights of the seat back. Pulling the drive source to pull the pull rope can cause the swing arm to rotate, and the swing arm drives the pendulum to move a certain distance. When the pull rope is released, the pendulum impacts the seat back under the action of gravity. The design of the swing impact assembly enables the pendulum ball to produce a stable and adjustable impact force under the action of the pull rope, effectively improving the test accuracy and efficiency.

[0007] Optionally, the lifting assembly includes: A moving block, wherein the moving block is slidably connected to the support frame, and the supporting crossbeam is connected to the moving block; A screw rod, the screw rod is rotatably connected to the support frame, and the screw rod is threadedly connected to the moving block; A lifting drive source is connected to the support frame, and the lifting drive source drives the screw rod to rotate.

[0008] By adopting the above technical solution, the lifting drive source drives the screw to rotate, the screw causes the moving block to move, and the moving block can drive the supporting beam to move, thereby realizing the lifting and lowering movement of the supporting beam, making the lifting and lowering of the supporting beam more stable and precise, so that the impact height of the pendulum on the seat back can be adjusted, thereby improving the flexibility and comprehensiveness of the test.

[0009] Optionally, two of the moving blocks and the screw rod are provided, the two moving blocks are respectively located at two ends of the supporting crossbeam, and the two screw rods correspond to the two moving blocks one by one; The supporting crossbeam is connected with a first reducer and a second reducer, and a transmission shaft is transmission-connected between the first reducer and the second reducer. Two transmission shafts and two second reducers are each provided, and the two second reducers are transmission-connected with the two screw rods respectively; the lifting drive source is transmission-connected with the first reducer, and the lifting drive source drives the two transmission shafts to rotate through the first reducer, and the transmission shaft drives the screw rod to rotate through the second reducer.

[0010] By adopting the above technical solution, the two moving blocks and the corresponding two screw rod structures enhance the stability of the entire device. Through the use of the first reducer and the two second reducers in conjunction with the transmission shaft, the consistency and synchronization of the lifting action are ensured, thereby improving the overall coordination and reliability of the equipment operation, thereby making the position adjustment of the seat back during impact tests at different heights more accurate and smooth.

[0011] Optionally, the swing impact assembly further includes a mounting frame, a magnetic connector and a pulley; the pulley is rotatably connected to the mounting frame, the pull rope passes around the pulley, and the end of the pull rope is connected to the magnetic connector; The pulling drive source is connected to the mounting frame, and the magnetic connection piece can be connected to or disconnected from the output end of the pulling drive source.

[0012] By adopting the above technical solution, when the magnetic connector is connected to the output end of the pulling drive source, the pulling drive source can pull the pendulum to rotate. When the magnetic connector is disconnected from the output end of the pulling drive source, the pendulum impacts the seat back under the action of gravity.

[0013] Optionally, the moving block is provided with an angle adjustment component, the supporting beam is rotatably connected to the moving block, and the angle adjustment component drives the supporting beam to rotate.

[0014] By adopting the above technical solution, the angle adjustment component drives the supporting beam to rotate, thereby adjusting the pendulum impact angle, thereby improving the flexibility and comprehensiveness of testing different angles of the seat back.

[0015] Optionally, the angle adjustment component includes: A support frame connected to the moving block; an adjustment driving source, wherein the adjustment driving source is connected to the support frame; Transmission member, the adjustment driving source drives the supporting beam to rotate through the transmission member.

[0016] By adopting the above technical solution, the driving source is adjusted to drive the supporting beam to rotate through the transmission member, thereby realizing the angle adjustment of the supporting beam, so that the seat back can be impact tested at different angles, thereby improving the comprehensiveness and flexibility of the test.

[0017] Optionally, the transmission member includes a worm wheel and a worm, the worm is connected to the output end of the adjustment drive source, the worm wheel is rotatably connected to the support frame, the support beam is connected to the worm wheel, and the worm wheel and the worm are meshed.

[0018] By adopting the above technical solution, the cooperation of the worm wheel and the worm gear can realize the adjustment of the driving source to smoothly drive the supporting beam to rotate, thereby accurately adjusting the impact angle of the pendulum on the seat back, and the worm wheel and the worm gear can be self-locking, so that the angle can be locked after adjusting the supporting beam, thereby improving stability.

[0019] Optionally, a translation adjustment component is provided on the support beam, and the translation adjustment component includes a support rail, a support plate and a shift drive source; the support rail is connected to the support beam, and the support plate is slidably connected to the support rail; a plurality of the swing impact components are arranged on the support plate, and the shift drive source drives the support plate to slide along the support rail.

[0020] By adopting the above technical solution, the displacement driving source drives the support plate to slide along the support track, so that the support plate drives the swing impact assembly to move, thereby being able to adjust the impact position of the pendulum on the seat back in the horizontal direction.

[0021] Optionally, a spacing adjustment component is provided on the support plate, and the spacing adjustment component includes a guide rail, a slider, a mobile driving source, a scissor structure and a fixed block; the guide rail is connected to the support plate, the slider is slidably connected to the guide rail, a plurality of sliders and a swing impact component are provided and correspond one to one, and the slider is connected to the connecting beam; The scissor structure is hinged to the plurality of sliders, the fixed block is connected to the support plate, one end of the scissor structure is connected to the fixed block, and the other end of the scissor structure is connected to the mobile driving source, and the mobile driving source drives the scissor structure to telescopically move.

[0022] By adopting the above technical solution, the mobile driving source drives the scissor structure to telescope and move, thereby changing the spacing between multiple sliders and making the spacing between adjacent sliders equal, thereby realizing the adjustment of the spacing between adjacent pendulums in the horizontal direction, which can adapt to seats of different specifications and improve applicability.

[0023] Optionally, a PLC control module is provided on the support frame, and the PLC control module is electrically connected to the lifting assembly and the swing impact assembly respectively.

[0024] By adopting the above technical solution, the PLC control module can control the operation of the lifting assembly and the swing impact assembly respectively, realize precise impact testing of the seat back at different heights and angles, and improve the efficiency and accuracy of the test.

[0025] In summary, the present application includes at least one of the following beneficial effects: 1. The lifting assembly can drive the supporting beam to move up and down, so that the pendulum can impact the seat back at different heights, solving the problem of inconvenient impact position adjustment in traditional methods and improving the comprehensiveness and efficiency of the test; 2. The angle adjustment assembly enables the support beam to rotate, thereby adjusting the pendulum's impact angle on the seat back, further enhancing the flexibility and adaptability of the test equipment; 3. The spacing adjustment component changes the spacing between adjacent pendulums by adjusting the spacing between sliders, thereby achieving rapid and continuous testing of various positions of the seat back, improving the comprehensiveness and accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 1 is a schematic diagram of the overall structure of a sandbag swing impact test device for a rail transit coach seat back according to Example 1 of the present application; Figure 2 It is a schematic diagram of the exploded structure of the support beam and the angle adjustment assembly of Example 1 of the present application; Figure 3 is a schematic structural diagram of a swing impact assembly according to Embodiment 1 of the present application; Figure 4 2 is a schematic diagram of the overall structure of a sandbag swing impact test device for a rail transit coach seat back according to Example 2 of the present application; Figure 5 2 is a schematic diagram of the overall structure of a sandbag swing impact test device for a rail transit coach seat back according to Example 3 of the present application; Figure 6 is a schematic diagram of the structure of the translation adjustment component and the spacing adjustment component of Example 3 of the present application; Figure 7 It is a partial structural schematic diagram of the translation adjustment component and the spacing adjustment component of Example 3 of the present application.

[0027] Explanation of the accompanying drawings: 1. test bench; 2. supporting base plate; 3. supporting frame; 4. lifting assembly; 41. lifting drive source; 42. moving block; 43. screw rod; 44. transmission shaft; 45. first reducer; 46. second reducer; 5. supporting beam; 6. angle adjustment assembly; 61. supporting frame; 62. adjustment drive source; 63. transmission member; 631. worm; 632. worm gear; 7. swing impact assembly; 71. mounting frame; 72. pulling drive source; 73. magnetic connecting member; 74. pulley; 75. pull rope; 76. connecting beam; 77. swing arm; 78. pendulum; 8. translation adjustment assembly; 81. supporting rail; 82. supporting plate; 83. shifting drive source; 9. spacing adjustment assembly; 91. guide rail; 92. slider; 93. moving drive source; 94. scissors structure; 95. fixed block; 10. PLC control module. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-7 This application is described in further detail.

[0029] Embodiment 1: Embodiment 1 of the present application provides a sandbag swing impact test device for a rail transit coach seat backrest.

[0030] refer to Figure 1 The rail transit coach seat back sandbag swing impact test device comprises a test bench 1, a support base plate 2 and a support frame 3. The support base plate 2 is fixedly connected to the ground, the test bench 1 and the support frame 3 are both fixedly connected to the support base plate 2, and the rail transit coach seat is installed on the test bench 1.

[0031] refer to Figure 1, a lifting assembly 4 is provided on the support frame 3, and the lifting assembly 4 includes a lifting drive source 41, a first reducer 45, a second reducer 46 and a transmission shaft 44. In this embodiment, the lifting drive source 41 is specifically a motor, and the support frame 3 is specifically a gantry. The body of the lifting drive source 41 is fixedly connected to the top of the support frame 3, the first reducer 45 is fixedly connected to the support frame 3, and the output shaft of the lifting drive source 41 is fixedly connected to the input shaft of the first reducer 45. The second reducer 46 is fixedly connected to the support frame 3, and the transmission shaft 44 is fixedly connected to the output shaft of the first reducer 45 and the input shaft of the second reducer 46 respectively.

[0032] refer to Figure 1 and Figure 2 The lifting assembly 4 further includes a moving block 42 and a screw rod 43. The moving block 42 is slidably connected to the support frame 3, the screw rod 43 is rotatably connected to the support frame 3, the screw rod 43 passes through the moving block 42 and is threadedly connected to the moving block 42, and the output shaft of the second reducer 46 is fixedly connected to the screw rod 43. When the lifting drive source 41 is started, the lifting drive source 41 drives the transmission shaft 44 to rotate through the first reducer 45, the transmission shaft 44 drives the screw rod 43 to rotate through the second reducer 46, and the screw rod 43 drives the moving block 42 to move up and down.

[0033] refer to Figure 1 In this embodiment, two second reducers 46, transmission shafts 44, screw rods 43 and moving blocks 42 are each provided, the first reducer 45 has two output shafts, the two transmission shafts 44 are respectively fixedly connected to the two output shafts of the first reducer 45, and the lifting drive source 41 can drive the two moving blocks 42 to lift and move at the same time.

[0034] refer to Figure 1 and Figure 2 , the moving block 42 is provided with an angle adjustment assembly 6, which includes a support frame 61, an adjustment drive source 62 and a transmission member 63. The support frame 61 is fixedly connected to the moving block 42, the adjustment drive source 62 is specifically a motor, and the body of the adjustment drive source 62 is fixedly connected to the support frame 61. The transmission member 63 includes a worm 631 and a worm wheel 632, the worm 631 is fixedly connected to the output shaft of the adjustment drive source 62, the worm wheel 632 is rotationally connected to the support frame 61, and the worm 631 and the worm wheel 632 are meshed.

[0035] refer to Figure 1 and Figure 2A support beam 5 is arranged between the two moving blocks 42. The support beam 5 is arranged horizontally. One end of the support beam 5 is fixedly connected to the worm gear 632, and the other end of the support beam 5 is rotatably connected to the moving block 42. When the moving block 42 moves up and down, the moving block 42 can drive the angle adjustment assembly 6 to move up and down, thereby adjusting the height of the support beam 5. The adjustment driving source 62 drives the worm gear 632 to rotate through the worm 631, and the worm gear 632 drives the support beam 5 to rotate, thereby adjusting the angle of the support beam 5.

[0036] refer to Figure 1 and Figure 3 The rail transit coach seat back sandbag swing impact test device also includes a swing impact assembly 7, which includes a connecting beam 76, a swing arm 77 and a pendulum 78. The connecting beam 76 is fixedly connected to the supporting crossbeam 5, the swing arm 77 is hinged to the connecting beam 76, and one end of the swing arm 77 is fixedly connected to the pendulum 78, which is specifically a sandbag.

[0037] refer to Figure 1 and Figure 3 , the swing impact assembly 7 also includes a mounting frame 71, a pulling drive source 72, a magnetic connection member 73, a pulley 74 and a pull rope 75. The mounting frame 71 is fixedly connected to the support base plate 2, the pulling drive source 72 is specifically an electric push rod, and the body of the pulling drive source 72 is fixedly connected to the mounting frame 71. The pulley 74 is rotatably connected to the mounting frame 71, the pull rope 75 is fixedly connected to one end of the swing arm 77 away from the pendulum 78, and the other end of the pull rope 75 is fixedly connected to the magnetic connection member 73 by passing around the pulley 74. In this embodiment, the magnetic connection member 73 is specifically an electromagnet, and the magnetic connection member 73 can be magnetically connected or disconnected with the output end of the pulling drive source 72.

[0038] refer to Figure 1 and Figure 3 When the output end of the pulling drive source 72 extends to contact with the magnetic connecting piece 73, the magnetic connecting piece 73 is magnetically connected to the output end of the pulling drive source 72, and then the pulling drive source 72 pulls the magnetic connecting piece 73 to move downward, and the magnetic connecting piece 73 pulls the swing arm 77 to rotate through the pull rope 75, and the swing arm 77 causes the pendulum 78 to swing. After the pendulum 78 is released, the pendulum 78 can impact the seat back located on the test bench 1.

[0039] refer to Figure 1 A PLC control module 10 is fixedly connected to the support frame 3, and the PLC control module 10 is electrically connected to the lifting drive source 41, the adjusting drive source 62, and the pulling drive source 72, respectively. The PLC control module 10 can control the actions of the lifting drive source 41, the adjusting drive source 62, and the pulling drive source 72. By controlling the actions of the pulling drive source 72 through the PLC control module 10, the angle of the swing arm 77 can be accurately controlled, thereby controlling the impact force of the pendulum 78 on the seat back.

[0040] The implementation principle of the sandbag swing impact test device for the seat back of a rail transit passenger car in Example 1 of the present application is as follows: the lifting drive source 41 can drive the moving block 42 to move up and down, so that the supporting beam 5 can move up and down, so that the pendulum 78 can impact the positions of different heights of the seat back. The adjustment drive source 62 drives the supporting beam 5 to rotate through the transmission member 63, so that the impact angle of the pendulum 78 on the seat back can be adjusted. The PLC control module 10 controls the action of the pulling drive source 72, and the pulling drive source 72 pulls the pull rope 75 to rotate the swing arm 77, so that the PLC control module 10 can accurately control the angle of the swing arm 77, and adjust the drop height of the pendulum 78, so that the pendulum 78 accumulates gravitational potential energy, and the magnetic connection member 73 is disconnected from the pulling drive source 72, so that the pendulum 78 swings, thereby impacting the seat back located on the test bench 1.

[0041] Embodiment 2: Embodiment 2 of the present application provides a sandbag swing impact test device for a rail transit coach seat backrest.

[0042] refer to Figure 4 , the difference between Example 2 of the present application and Example 1 is that: in this embodiment, four groups of swing impact assemblies 7 are provided, and a row of seats on the test bench 1 has four seats. The four groups of swing impact assemblies 7 correspond to the four seats one by one, so that the backrests of the four seats can be impact tested at the same time, thereby improving the test efficiency. In other implementations of this embodiment, the swing impact assemblies 7 are also provided in other quantities, so that the swing impact assemblies 7 correspond to the number of seats of the seats being tested one by one.

[0043] Embodiment 3: Embodiment 3 of the present application provides a sandbag swing impact test device for a rail transit coach seat backrest.

[0044] refer to Figure 5 and Figure 6 , the difference between Example 3 of the present application and Example 2 is that: a translation adjustment component 8 is provided on the support beam 5, and the translation adjustment component 8 includes a support rail 81, a support plate 82 and a shift drive source 83. The support rail 81 is fixedly connected to the support beam 5, the length direction of the support rail 81 is parallel to the length direction of the support beam 5, and the support plate 82 is slidably connected to the support rail 81. The shift drive source 83 specifically adopts an electric push rod, the body of the shift drive source 83 is fixedly connected to the support beam 5, and the output end of the shift drive source 83 is fixedly connected to the support plate 82. When the shift drive source 83 is started, the shift drive source 83 can drive the support plate 82 to slide along the support rail 81.

[0045] refer to Figure 6 and Figure 7 The support plate 82 is provided with a spacing adjustment assembly 9, which includes a guide rail 91, a slider 92, a mobile driving source 93, a scissor structure 94 and a fixed block 95. The guide rail 91 is fixedly connected to the support plate 82, the length direction of the guide rail 91 is parallel to the length direction of the supporting beam 5, and the slider 92 is slidably connected to the guide rail 91. The connecting beam 76 is fixedly connected to the slider 92, and a plurality of sliders 92 are arranged at equal intervals, and the plurality of sliders 92 correspond to the plurality of connecting beams 76 one by one.

[0046] refer to Figure 6 and Figure 7 , the guide rail 91 is mounted on the support plate 82, there is a gap between the guide rail 91 and the support plate 82, and the scissor structure 94 is located between the guide rail 91 and the support plate 82. The hinge points in the middle of the scissor structure 94 are respectively hinged to multiple sliders 92, the fixed block 95 is fixedly connected to the support plate 82, and one end of the scissor structure 94 is hinged to the fixed block 95. The mobile drive source 93 specifically adopts an electric push rod, the body of the mobile drive source 93 is fixedly connected to the support plate 82, and the output end of the mobile drive source 93 is hinged to one end of the scissor structure 94 away from the fixed block 95. It is worth noting that after the slider 92 moves in the horizontal direction, the swing arm 77 will move accordingly. Since the pull rope 75 is flexible, it does not affect the pull drive source 72 to pull the swing arm 77 to rotate through the pull rope 75, and the pendulum 78 can still impact the seat back.

[0047] The implementation principle of the sandbag swing impact test device for the backrest of a rail transit passenger car in Example 3 of the present application is as follows: the displacement drive source 83 drives the support plate 82 to move, which can adjust the horizontal position of the swing impact assembly 7, thereby adjusting the impact position of the pendulum 78 on the seat back in the horizontal direction. The mobile drive source 93 drives the end of the scissor structure 94 to move, and the scissor structure 94 drives multiple sliders 92 to slide, changing the spacing between the sliders 92, thereby adjusting the impact spacing between adjacent pendulums 78, which can adapt to seats of different specifications and improve applicability.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A sandbag swing impact test device for a rail transit coach seat back, characterized in that: The invention comprises a test bench (1), a support frame (3), a lifting assembly (4), a support beam (5) and a swing impact assembly (7); the test bench (1) is used for installing a seat, the lifting assembly (4) is arranged on the support frame (3), the support beam (5) is slidably arranged with the support frame (3), and the lifting assembly (4) drives the support beam (5) to move up and down; The swing impact assembly (7) comprises a connecting beam (76), a swing arm (77), a pendulum (78), a pull rope (75) and a pulling drive source (72); the connecting beam (76) is connected to the supporting cross beam (5), the swing arm (77) is hinged to the connecting beam (76), the pendulum (78) is connected to one end of the swing arm (77), and the pull rope (75) is connected to the other end of the swing arm (77); the pulling drive source (72) pulls the pull rope (75) so that the pendulum (78) impacts the seat back.

2. A rail transit passenger car seat back sandbag swing impact test device according to claim 1, characterized in that: The lifting assembly (4) comprises: A moving block (42), the moving block (42) being slidably connected to the support frame (3), and the supporting crossbeam (5) being connected to the moving block (42); A screw rod (43), the screw rod (43) being rotatably connected to the support frame (3), and the screw rod (43) being threadably connected to the moving block (42); A lifting drive source (41), the lifting drive source (41) is connected to the support frame (3), and the lifting drive source (41) drives the screw rod (43) to rotate.

3. A rail transit passenger car seat back sandbag swing impact test device according to claim 2, characterized in that: Two of each of the moving blocks (42) and the screw rods (43) are provided, the two moving blocks (42) are respectively located at two ends of the supporting crossbeam (5), and the two screw rods (43) correspond one to one with the two moving blocks (42); The supporting crossbeam (5) is connected to a first reducer (45) and a second reducer (46); a transmission shaft (44) is transmission-connected between the first reducer (45) and the second reducer (46); two transmission shafts (44) and two second reducers (46) are provided, and the two second reducers (46) are transmission-connected to the two screw rods (43) respectively; the lifting drive source (41) is transmission-connected to the first reducer (45); the lifting drive source (41) drives the two transmission shafts (44) to rotate through the first reducer (45); and the transmission shaft (44) drives the screw rod (43) to rotate through the second reducer (46).

4. The sandbag swing impact test device for a rail transit coach seat back according to claim 1, characterized in that: The swing impact assembly (7) further comprises a mounting frame (71), a magnetic connection member (73) and a pulley (74); the pulley (74) is rotationally connected to the mounting frame (71), the pull rope (75) passes around the pulley (74), and the end of the pull rope (75) is connected to the magnetic connection member (73); The pulling drive source (72) is connected to the mounting frame (71), and the magnetic connection member (73) can be connected to or disconnected from the output end of the pulling drive source (72).

5. The sandbag swing impact test device for a rail transit coach seat back according to claim 2, characterized in that: An angle adjustment component (6) is provided on the moving block (42), the supporting crossbeam (5) is rotatably connected to the moving block (42), and the angle adjustment component (6) drives the supporting crossbeam (5) to rotate.

6. A rail transit coach seat back sandbag swing impact test device according to claim 5, characterized in that: The angle adjustment component (6) comprises: A support frame (61), the support frame (61) being connected to the moving block (42); an adjusting driving source (62), the adjusting driving source (62) being connected to the supporting frame (61); A transmission member (63), wherein the adjustment drive source (62) drives the supporting crossbeam (5) to rotate via the transmission member (63).

7. A rail transit coach seat back sandbag swing impact test device according to claim 6, characterized in that: The transmission member (63) comprises a worm wheel (632) and a worm (631); the worm (631) is connected to the output end of the adjustment drive source (62); the worm wheel (632) is rotationally connected to the support frame (61); the support crossbeam (5) is connected to the worm wheel (632); and the worm wheel (632) and the worm (631) are meshed.

8. The rail transit coach seat back sandbag swing impact test device according to claim 1, characterized in that: A translation adjustment component (8) is arranged on the support crossbeam (5), and the translation adjustment component (8) comprises a support rail (81), a support plate (82) and a shift drive source (83); the support rail (81) is connected to the support crossbeam (5), and the support plate (82) is slidably connected to the support rail (81); a plurality of the swing impact components (7) are arranged on the support plate (82), and the shift drive source (83) drives the support plate (82) to slide along the support rail (81).

9. A rail transit coach seat back sandbag swing impact test device according to claim 8, characterized in that: The support plate (82) is provided with a spacing adjustment component (9), the spacing adjustment component (9) comprising a guide rail (91), a slider (92), a mobile driving source (93), a scissor structure (94) and a fixed block (95); the guide rail (91) is connected to the support plate (82), the slider (92) is slidably connected to the guide rail (91), a plurality of sliders (92) and the swing impact component (7) are provided and correspond one to one, and the slider (92) is connected to the connecting beam (76); The scissor structure (94) is hinged to the plurality of sliders (92), the fixed block (95) is connected to the support plate (82), one end of the scissor structure (94) is connected to the fixed block (95), and the other end of the scissor structure (94) is connected to the mobile drive source (93), and the mobile drive source (93) drives the scissor structure (94) to telescope and move.

10. The rail transit passenger car seat back sandbag swing impact test device according to claim 1, characterized in that: A PLC control module (10) is provided on the support frame (3), and the PLC control module (10) is electrically connected to the lifting assembly (4) and the swing impact assembly (7) respectively.

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