A stiffness testing device for testing automobile seats

Abstract

The present invention discloses a stiffness testing device for automobile seat testing, which relates to the technical field of automobile seat testing; the device comprises a base plate and an impact component, wherein a seat base is fixedly connected above the base plate, a seat back is fixedly connected above the seat base, a marking pump and a belt support frame are fixedly connected above the base plate, stabilizing wheels and stabilizing wheel groups are rotatably connected at both ends of the belt support frame, one end of the stabilizing wheel is transmission-connected with a driving belt, and one side of the driving belt is slidably connected to the belt support frame; when the movable end of the impact component moves, the driving rod is driven to move horizontally through a lever on one side, and the marking pump is driven to spray a straight colored line to a rotating shaft connecting the seat back and the seat base through a spray line assembly, and then the movable end of the impact component hits the seat back, if the connection of the seat back is deformed, the straight line will be broken for easy inspection, and at the same time, ink can be automatically sprayed during the impact without manual line painting, so that the operation is more convenient and the safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile seat testing, in particular to a stiffness testing device for automobile seat testing. Background Art

[0002] Car seats are composed of seat cushions, backrests, side back supports, headrests, etc. They have a certain surface shape. The outer curves of the seat surface and backrest should match the back curve of the human body in a relaxed state. After the occupants are seated, the surface shape of the seat and the body pressure distribution can make the occupants' muscles in the most relaxed state, support the lumbar spine, will not cause limb numbness due to poor blood circulation, and will not easily feel tired after long-term riding. Therefore, car seats are an important part of the safety system for drivers and passengers during driving. In order to ensure riding safety, car seats need to be tested for stiffness during production. Stiffness refers to the ability of a material or structure to resist elastic deformation when subjected to force, and is a representation of the difficulty of elastic deformation of a material or structure. Therefore, it is generally tested by external force impacting the car seat.

[0003] After searching, the Chinese patent publication number CN116465579A discloses a car seat stiffness test device and a method of use, including: a dummy model, an inertial impact mechanism, two sets of reciprocating clamping and falling mechanisms, a vertical traction mechanism, a horizontal traction mechanism and a mounting seat. The dummy model naturally falls back and forth in the seat, the dummy model counterweight is adjustable, the dummy model joints are movable, and the inertial impact mechanism is set at the rear side of the seat and can simulate the rear vehicle collision along the direction of the seat. The above patent has the problem that the deformation of the connection between the seat base and the seat back when receiving an external force collision is often difficult to observe with the naked eye, and needs to be marked before the test. However, because high-speed collisions may cause parts to splash, manual marking during continuous testing requires opening the protective plate, which is cumbersome and unsafe. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a stiffness testing device for testing a car seat.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A stiffness testing device for testing a car seat comprises a base plate and an impact component, wherein a seat base is fixedly connected above the base plate, a seat back is fixedly connected above the seat base, a marking pump and a belt support frame are fixedly connected above the base plate, a stabilizing wheel and a stabilizing wheel group are rotatably connected at both ends of the belt support frame, one end of the stabilizing wheel is transmission-connected with a driving belt, one side of the driving belt is slidably connected to the belt support frame, one side of the impact component is fixedly connected with an adjustment assembly, one side of a movable end of the impact component is fixedly connected with a lever, one side of the lever is slidably connected with a driving rod, one end of the driving rod is fixedly connected with a driving plate, one side of the driving plate is fixedly connected with the driving belt, one end of the stabilizing wheel group is transmission-connected to the marking pump through a transmission belt, and an ink outlet end of the marking pump is rotationally connected with a spray line assembly;

[0007] The adjustment assembly includes a transverse moving bracket, a lifting bracket and a steering motor, one side of the transverse moving bracket is slidably connected to the top of the base plate, the two sides of the lifting bracket are slidably connected to the transverse moving bracket, one side of the lifting bracket is fixedly connected to the steering motor, the power output end of the steering motor is fixedly connected to the impact component, one side of the transverse moving bracket is fixedly connected to the stabilizing bracket, one side of the stabilizing bracket is slidably connected to the limit slider, the inner side of the limit slider is slidably connected to the driving rod, and the driving rod and one end of the limit slider are fixedly connected to a spring;

[0008] The spray line assembly includes a spray pipe and a marking nozzle, one end of the spray pipe is rotatably connected to the marking pump, and one end of the marking nozzle is fixedly connected to the spray pipe;

[0009] A ratchet is fixedly connected to one side of the spray pipe, an angle adjustment rod is fixedly connected to one side of the limit slider, one end of the angle adjustment rod is slidably connected to a ratchet plate, an anti-fall plate is fixedly connected above the ratchet plate, a bevel gear is fixedly connected to one side of the spray pipe, a crown gear is transmission-connected to one side of the bevel gear, a transmission gear one is fixedly connected to one side of the crown gear, and one side of the transmission gear one is rotationally connected to the bottom of the marking pump.

[0010] As a further solution of the present invention: the ink inlet end of the marking pump is rotatably connected to a second transmission gear, one side of the second transmission gear is meshed with the first transmission gear, and a rotary joint is fixedly connected below the second transmission gear.

[0011] On the basis of the above scheme: one side of the marking pump is fixedly connected to a storage tank, a plurality of docking ports are opened above the storage tank, a rotating groove is opened above the docking port, a material extraction joint is slidably connected below the rotating joint, and a spring 2 is fixedly connected to one end of the material extraction joint and the rotating joint.

[0012] On the basis of the above scheme: a clamping motor is fixedly connected inside the base plate, telescopic slots are opened around the base plate, a turntable is fixedly connected to the power output end of the clamping motor, a connecting rod is rotatably connected to one side of the turntable, and the connecting rod is rotatably connected to a clamping rod.

[0013] On the basis of the above scheme: one end of the turntable is rotatably connected to the second connecting rod, one end of the second connecting rod is rotatably connected to the second clamping rod, and the first clamping rod and the second clamping rod are slidably connected in the telescopic slot.

[0014] The beneficial effects of the present invention are as follows: a stiffness testing device for testing automobile seats, when the movable end of the impact component moves, the driving rod is driven to move horizontally through the lever on one side, and the marking pump is driven to spray a straight colored line to the rotating shaft connecting the seat back and the seat base through the spray line assembly, and then the movable end of the impact component hits the seat back. If the connection of the seat back is deformed, the straight line will break for easy inspection, and at the same time, ink can be automatically sprayed during the impact without manual line painting, which makes the operation more convenient and improves safety.

[0015] A stiffness testing device for testing automobile seats, when a limit slider follows an impact component to move in the opposite direction and reset, a ratchet plate can drive a ratchet wheel to drive a marking nozzle to rotate a certain angle, so that the spray lines will not overlap and the recognition is improved.

[0016] A stiffness testing device for testing automobile seats can drive the transmission gear below to rotate when a spray pipe rotates, thereby causing a rotary joint to rotate, so that the rotary joint can drive the material taking joint below to rotate from one docking port to another docking port. Different docking ports are connected to ink cartridges of different colors through pipes below, so that each inkjet has a different color, which is convenient for identifying different times of testing.

[0017] A stiffness testing device for testing automobile seats, wherein a clamping motor rotates clockwise to drive a clamping rod 1 through a connecting rod 1 to clamp a seat base from both sides to the center, and then the clamping motor rotates counterclockwise to move the clamping rod 1 outward, and then the clamping rod 2 moves inward to clamp and center the seat base in another direction, and at the same time, the two clamping rods 1 clamp the seat base to prevent the seat base from sliding when impacted.

[0018] A stiffness testing device for testing automobile seats has the advantage that when an impact component moves in the reverse direction, the impact component can be rotated upward to make a driving rod move upward so that a driving plate does not contact a driving belt, thereby preventing a marking pump from turning over and causing damage to components. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the main structure of a stiffness testing device for testing a car seat proposed by the present invention;

[0020] Figure 2 It is a schematic diagram of the installation structure of a lifting bracket of a stiffness testing device for testing a car seat proposed by the present invention;

[0021] Figure 3 The present invention proposes a rigidity testing device for testing a car seat. Figure 1 A structural diagram;

[0022] Figure 4 The present invention proposes a rigidity testing device for testing a car seat. Figure 1 Schematic diagram of the structure at B;

[0023] Figure 5 It is a schematic diagram of the drive belt installation structure of a stiffness testing device for testing a car seat proposed by the present invention;

[0024] Figure 6 It is a schematic diagram of the structure of a ratchet plate of a stiffness testing device for testing a car seat proposed by the present invention;

[0025] Figure 7 It is a schematic diagram of the installation structure of a marking pump of a stiffness testing device for testing a car seat proposed by the present invention;

[0026] Figure 8 It is a schematic diagram of the partial structure of a spray pipe of a stiffness testing device for testing a car seat proposed by the present invention;

[0027] Fig. 9 It is a schematic diagram of a ratchet wheel of a stiffness testing device for testing a car seat proposed by the present invention;

[0028] Fig.10 The present invention discloses a schematic diagram of the internal structure of a substrate of a stiffness testing device for testing a car seat.

[0029] In the figure: 1, base plate; 2, seat base; 3, seat back; 4, lateral bracket; 5, stabilizing bracket; 6, lifting bracket; 7, impact component; 8, steering motor; 9, lever; 10, driving rod; 11, belt support frame; 12, stabilizing wheel; 13, driving belt; 14, limit slider; 15, spring 1; 16, driving plate; 17, angle adjustment rod; 18, stabilizing wheel set; 19, marking pump; 20, transmission belt; 21, storage tank; 2 2. Ratchet plate; 23. Anti-drop plate; 24. Spray pipe; 25. Marking nozzle; 26. Ratchet; 27. Bevel gear; 28. Crown gear; 29. ​​Transmission gear one; 30. Transmission gear two; 31. Rotary joint; 32. Material removal joint; 33. Spring two; 34. Docking port; 35. Clamping motor; 36. Turntable; 37. Telescopic slot; 38. Connecting rod one; 39. Clamping rod one; 40. Connecting rod two; 41. Clamping rod two; 42. Rotating slot. DETAILED DESCRIPTION

[0030] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention. Example

[0032] A stiffness testing device for testing automobile seats, such as Figure 1-10 As shown, it includes a base plate 1 and an impact component 7, and the impact component 7 is preferably a hydraulic rod. A seat base 2 is fixedly connected to the top of the base plate 1, and a seat back 3 is fixedly connected to the top of the seat base 2. A marking pump 19 and a belt support frame 11 are fixedly connected to the top of the base plate 1. Stabilizing wheels 12 and stabilizing wheel sets 18 are rotatably connected at both ends of the belt support frame 11. One end of the stabilizing wheel 12 is transmission-connected to a driving belt 13, and one side of the driving belt 13 is slidably connected to the belt support frame 11. An adjustment component is fixedly connected to one side of the impact component 7. A shifting rod 9 is fixedly connected to one side of the movable end of the impact component 7, and a driving rod 10 is slidably connected to one side of the shifting rod 9. One end of the driving rod 10 is fixedly connected to a driving plate 16, and one side of the driving plate 16 is fixedly connected to the driving belt 13. One end of the stabilizing wheel set 18 is transmission-connected to the marking pump 19 through a transmission belt 20, and the ink outlet end of the marking pump 19 is rotationally connected to a spray line assembly.

[0033] When the impact component 7 is extended and hits the seat back 3 through the active end to perform a stiffness test on the connection between the seat base 2 and the seat back 3, when the active end of the impact component 7 moves, the driving rod 10 will be driven to move horizontally through the lever 9 on one side. At this time, the driving plate 16 under the driving rod 10 will drive the driving belt 13 to move. When the driving belt 13 moves, it will drive the stabilizing wheel set 18 on one side to rotate. The stabilizing wheel set 18 is composed of two rotating wheels. The rotation of one side can drive the rotating wheel on one side of the marking pump 19 to rotate through the transmission belt 20. The marking pump 19 is preferably a piston pump. When the rotating wheel on one side of the marking pump 19 rotates, a straight colored line can be sprayed to the rotating shaft connecting the seat back 3 and the seat base 2 through the spray line assembly at the ink outlet end. Then the active end of the impact component 7 hits the seat back 3. If the rotating shaft connection between the seat back 3 and the seat base 2 is rotated and deformed, the straight line will be broken for easy inspection. At the same time, ink can be automatically sprayed during the collision without manual line painting, which makes the operation more convenient and improves safety.

[0034] The spray line assembly includes a spray pipe 24 and a marking nozzle 25. One end of the spray pipe 24 is rotatably connected to the marking pump 19, and one end of the marking nozzle 25 is fixedly connected to the spray pipe 24. One end of the marking nozzle 25 is an elongated slot and can spray a straight line.

[0035] In order to solve the problem of adjusting the position of the impact component 7; Figure 1-10As shown, the adjustment assembly includes a transverse moving bracket 4, a lifting bracket 6 and a steering motor 8. One side of the transverse moving bracket 4 is slidably connected to the top of the base plate 1, and both sides of the lifting bracket 6 are slidably connected to the transverse moving bracket 4. One side of the lifting bracket 6 is fixedly connected with a steering motor 8, and the power output end of the steering motor 8 is fixedly connected to the impact component 7. The transverse moving bracket 4 can drive the impact component 7 to move forward and backward. There are electric sliders on both sides of the lifting bracket 6 to drive the impact component 7 to move up and down. The steering motor 8 can drive one end of the impact component 7 to rotate up and down to adjust the angle. When the impact component 7 moves in the opposite direction, the impact component 7 can be rotated upward to make the drive rod 10 move upward. The drive plate 16 does not contact the drive belt 13, thereby preventing the marking pump 19 from flipping over and causing component damage.

[0036] In order to solve the problem of making the driving rod 10 swing and the driving plate 16 close to the driving belt 13 to prevent slipping; Figure 1-10 As shown, one side of the transverse moving bracket 4 is fixedly connected to a stabilizing bracket 5, one side of the stabilizing bracket 5 is slidably connected to a limiting slider 14, the limiting slider 14 is slidably connected to the driving rod 10 on the inner side, and a spring 15 is fixedly connected to one end of the driving rod 10 and the limiting slider 14;

[0037] The limit slider 14 can stabilize the posture of the driving rod 10 when the driving rod 10 moves forward and backward to prevent the driving rod 10 from deflecting. At the same time, the spring 15 can press the driving rod 10 downward so that the driving plate 16 can be close to the driving belt 13 to prevent slipping.

[0038] In order to solve the problem that the angle of the marking nozzle 25 needs to be adjusted for easy identification when spraying multiple times; Figure 1-10 As shown, a ratchet 26 is fixedly connected to one side of the spray pipe 24, an angle adjustment rod 17 is fixedly connected to one side of the limit slider 14, a ratchet plate 22 is slidably connected to one end of the angle adjustment rod 17, and an anti-fall plate 23 is fixedly connected above the ratchet plate 22. When the limit slider 14 moves in the opposite direction and resets following the impact component 7, the ratchet plate 22 can drive the ratchet 26 to drive the marking nozzle 25 to rotate a certain angle, so that the spray lines will not overlap and the recognition will be improved. When the ratchet plate 22 moves forward, the ratchet teeth on one side of the ratchet wheel 26 will contact with each other, which will cause the ratchet plate 22 to move upward without driving the ratchet wheel 26.

[0039] In order to solve the problem that different colors of marks can be sprayed when spraying lines at different times to further improve the recognition; Figure 1-10As shown, one side of the injection pipe 24 is fixedly connected to a bevel gear 27, one side of the bevel gear 27 is transmission-connected to a crown gear 28, one side of the crown gear 28 is fixedly connected to a transmission gear 1 29, one side of the transmission gear 1 29 is rotationally connected to the bottom of the marking pump 19, the ink inlet end of the marking pump 19 is rotationally connected to a transmission gear 2 30, one side of the transmission gear 2 30 is meshed with the transmission gear 1 29, a rotary joint 31 is fixedly connected to the bottom of the transmission gear 2 30, one side of the marking pump 19 is fixedly connected to a storage tank 21, a plurality of docking ports 34 are opened above the storage tank 21, a rotating groove 42 is opened above the docking port 34, a material taking joint 32 is slidably connected to the bottom of the rotary joint 31, and a spring 2 33 is fixedly connected to one end of the material taking joint 32 and the rotary joint 31;

[0040] When the spray pipe 24 rotates, it can drive the transmission gear 29 below to rotate, and then the rotary joint 31 can be rotated, so that the rotary joint 31 can drive the material collection joint 32 below to rotate from one side docking port 34 to another docking port 34. Different docking ports 34 are connected to ink cartridges of different colors through pipes below, so that each inkjet color is different, which is convenient for identifying different times of testing. The ink cartridges in the preferred storage tank 21 store quick-drying ink for inkjet printers and printers, which can dry quickly to prevent flow due to gravity.

[0041] When the present embodiment is in use, the lateral moving bracket 4 can drive the impact component 7 to move forward and backward, the electric sliders on both sides of the lifting bracket 6 can drive the impact component 7 to move up and down, and the steering motor 8 can drive one end of the impact component 7 to rotate up and down to adjust the angle. When the impact component 7 moves in the opposite direction, the impact component 7 can be rotated upward to make the driving rod 10 move upward and the driving plate 16 does not contact the driving belt 13, so as to prevent the marking pump 19 from turning over and causing damage to the components.

[0042] When the impact component 7 is extended and hits the seat back 3 through the active end to perform a stiffness test on the connection between the seat base 2 and the seat back 3, when the active end of the impact component 7 moves, the driving rod 10 will be driven to move horizontally through the lever 9 on one side. At this time, the driving plate 16 under the driving rod 10 will drive the driving belt 13 to move. When the driving belt 13 moves, it will drive the stabilizing wheel set 18 on one side to rotate. The stabilizing wheel set 18 is composed of two rotating wheels. The rotation of one side can drive the rotating wheel on one side of the marking pump 19 to rotate through the transmission belt 20. The marking pump 19 is preferably a piston pump. When the rotating wheel on one side of the marking pump 19 rotates, a straight colored line can be sprayed to the rotating shaft connecting the seat back 3 and the seat base 2 through the spray line assembly at the ink outlet end. Then the active end of the impact component 7 hits the seat back 3. If the rotating shaft connection between the seat back 3 and the seat base 2 is rotated and deformed, the straight line will be broken for easy inspection. At the same time, ink can be automatically sprayed during the collision without manual line painting, which makes the operation more convenient and improves safety.

[0043] The limit slider 14 can stabilize the posture of the driving rod 10 when the driving rod 10 moves forward and backward to prevent the driving rod 10 from deflecting. At the same time, the spring 15 can press the driving rod 10 downward so that the driving plate 16 can be close to the driving belt 13 to prevent slipping;

[0044] When the limit slider 14 moves in the opposite direction following the impact component 7 to reset, the ratchet plate 22 can drive the ratchet 26 to drive the marking nozzle 25 to rotate a certain angle, so that the spray lines will not overlap, thereby improving the recognition. At the same time, the spray pipe 24 can drive the transmission gear 29 below to rotate, and then the rotary joint 31 can be rotated, so that the rotary joint 31 can drive the material taking joint 32 below to rotate from one side docking port 34 to another docking port 34. Different colors of ink cartridges are connected to different docking ports 34 through pipes below, so that the color of each inkjet is different, which is convenient for identifying different times of testing. Example

[0045] A stiffness testing device for testing automobile seats, such as Figure 1-10 As shown, in order to prevent the seat base 2 from sliding when impacted and to facilitate the seat base 2 to be moved to the center for easy installation during installation; this embodiment makes the following improvements on the basis of embodiment 1: a clamping motor 35 is fixedly connected inside the base plate 1, and telescopic grooves 37 are opened around the base plate 1. A turntable 36 is fixedly connected to the power output end of the clamping motor 35, and a connecting rod 1 38 is rotatably connected to one side of the turntable 36, and the connecting rod 1 38 is rotatably connected to a clamping rod 1 39, and one end of the turntable 36 is rotatably connected to a connecting rod 2 40, and one end of the connecting rod 2 40 is rotatably connected to a clamping rod 2 41, and the clamping rod 1 39 and the clamping rod 2 41 are slidably connected in the telescopic groove 37;

[0046] First, place the seat base 2 on the base plate 1, and then the clamping motor 35 rotates clockwise to drive the clamping rod 1 39 to clamp the seat base 2 in the center from both sides through the connecting rod 1 38, and then the clamping motor 35 rotates counterclockwise to make the clamping rod 1 39 move outward, and then the clamping rod 2 41 moves inward to clamp and center the seat base 2 in the other direction. At the same time, the two clamping rods 1 39 clamp the seat base 2 to prevent the seat base 2 from sliding when it is impacted.

[0047] The above is a preferred specific implementation manner of the present invention, and the protection scope of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by any technician familiar with the field within the technical scope disclosed by the present invention in combination with the prior art or public common sense, within the spirit and principle of the present invention, shall be covered by the protection scope of the present invention.

Claims

1. A stiffness testing device for testing a car seat, comprising a base plate (1) and an impact component (7), characterized in that: The base plate (1) is fixedly connected to a seat base (2) above, the seat base (2) is fixedly connected to a seat back (3) above, the base plate (1) is fixedly connected to a marking pump (19) and a belt support frame (11) above, the belt support frame (11) is rotatably connected to a stabilizing wheel (12) and a stabilizing wheel group (18) at both ends, one end of the stabilizing wheel (12) is transmission-connected to a driving belt (13), one side of the driving belt (13) is slidably connected to the belt support frame (11), one side of the impact component (7) is fixedly connected to an adjustment component, one side of the movable end of the impact component (7) is fixedly connected to a lever (9), one side of the lever (9) is slidably connected to a driving rod (10), one end of the driving rod (10) is fixedly connected to a driving plate (16), one side of the driving plate (16) is fixedly connected to the driving belt (13), one end of the stabilizing wheel group (18) is transmission-connected to the marking pump (19) via a transmission belt (20), and the ink outlet end of the marking pump (19) is rotatably connected to a spray line component; The adjustment assembly comprises a transverse moving bracket (4), a lifting bracket (6) and a steering motor (8); one side of the transverse moving bracket (4) is slidably connected to the top of the base plate (1); both sides of the lifting bracket (6) are slidably connected to the transverse moving bracket (4); one side of the lifting bracket (6) is fixedly connected to the steering motor (8); the power output end of the steering motor (8) is fixedly connected to the impact component (7); one side of the transverse moving bracket (4) is fixedly connected to the stabilizing bracket (5); one side of the stabilizing bracket (5) is slidably connected to a limiting slider (14); the inner side of the limiting slider (14) is slidably connected to the driving rod (10); one end of the driving rod (10) and the limiting slider (14) are fixedly connected to a spring 1 (15); The spray line assembly comprises a spray pipe (24) and a marking nozzle (25), one end of the spray pipe (24) is rotatably connected to the marking pump (19), and one end of the marking nozzle (25) is fixedly connected to the spray pipe (24); One side of the injection pipe (24) is fixedly connected to a ratchet wheel (26); one side of the limit slider (14) is fixedly connected to an angle adjustment rod (17); one end of the angle adjustment rod (17) is slidably connected to a ratchet plate (22); an anti-drop plate (23) is fixedly connected above the ratchet plate (22); one side of the injection pipe (24) is fixedly connected to a bevel gear (27); one side of the bevel gear (27) is transmission-connected to a crown gear (28); one side of the crown gear (28) is fixedly connected to a transmission gear 1 (29); one side of the transmission gear 1 (29) is rotationally connected to the bottom of the marking pump (19).

2. A stiffness testing device for testing a car seat according to claim 1, characterized in that: The ink inlet end of the marking pump (19) is rotatably connected to a second transmission gear (30), one side of the second transmission gear (30) is meshed with the first transmission gear (29), and a rotary joint (31) is fixedly connected below the second transmission gear (30).

3. A stiffness testing device for testing a car seat according to claim 2, characterized in that: One side of the marking pump (19) is fixedly connected to a storage tank (21), a plurality of docking ports (34) are provided above the storage tank (21), a rotating groove (42) is provided above the docking ports (34), a material taking joint (32) is slidably connected below the rotating joint (31), and a spring 2 (33) is fixedly connected between the material taking joint (32) and one end of the rotating joint (31).

4. A stiffness testing device for testing a car seat according to claim 3, characterized in that: A clamping motor (35) is fixedly connected inside the base plate (1), telescopic slots (37) are formed around the base plate (1), a turntable (36) is fixedly connected to the power output end of the clamping motor (35), a connecting rod (38) is rotatably connected to one side of the turntable (36), and the connecting rod (38) is rotatably connected to a clamping rod (39).

5. A stiffness testing device for testing a car seat according to claim 4, characterized in that: One end of the rotating disk (36) is rotatably connected to a second connecting rod (40), one end of the second connecting rod (40) is rotatably connected to a second clamping rod (41), and the first clamping rod (39) and the second clamping rod (41) are slidably connected in the telescopic slot (37).

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