A test device for seat belt detection and method of use thereof

Abstract

The application belongs to the technical field of safety belt impact test, and particularly relates to a test device for safety belt detection and a use method thereof, which comprises a double-track accelerating assembly, a telescopic impact assembly, a speed adjusting assembly, a rotary driving assembly, an impact limiting assembly, an impact resetting assembly and a track mounting frame, the double-track accelerating assembly is arranged on the track mounting frame, and the telescopic impact assembly is arranged on the rotary driving assembly. The application proposes an accelerating scheme of extruding an annular track, and prolongs the accelerating path of the load through a circulating track; in order to simplify the mechanism of triggering the impact, the application does not use a sensor to monitor the speed or kinetic energy, and does not design a gear shifting motor, but controls the track switching of the load through the centrifugal force affected by the speed, and when the kinetic energy is accumulated to a certain degree, the load is automatically moved outward to impact the seat and simulate the working condition.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of safety belt impact test, and particularly relates to a test device for safety belt detection and a use method thereof. BACKGROUND

[0002] The safety belt comprises a woven belt and a matched winding and locking structure. Two working conditions exist in actual use of the safety belt. One is a continuous force working condition (mainly the tightening force of the spring during wearing of the safety belt, and the value is small), and the other is a working condition subjected to instantaneous impact (the instantaneous impact of the inertia of a person on the safety belt system during sudden braking or a traffic accident, and the value is large). The instantaneous large impact belongs to an extreme working condition compared with the two, and therefore only the working condition needs to be tested. As long as the strength requirement of the working condition is met, the continuous small load working condition can be inevitably met.

[0003] In order to simulate the instantaneous large impact working condition of the traffic accident, a load needs to be hit against a seat, and the load carries a large amount of kinetic energy and has a suitable weight.

[0004] In the prior art, the acceleration of the load needs time, and the seat needs to be located on the movement path of the load. Therefore, in order to complete the acceleration of the load, a first scheme is to set a long acceleration distance. However, this will occupy a large space and increase the weight and cost of the equipment. A second scheme is to set a large-power acceleration motor. However, this will still cause a large increase in cost. SUMMARY

[0005] In view of the above situation, in order to overcome the defects of the prior art, the application provides a test device for safety belt detection and a use method thereof. In order to take into account both the cost and the space occupation, the application proposes an acceleration scheme of extruding a ring-shaped track, and the acceleration path of the load is prolonged through the circular track. In order to simplify the mechanism of triggering the impact, the application does not use a sensor to monitor the speed or kinetic energy, nor does it design a gear shifting motor. Instead, the track switching of the load is controlled through the centrifugal force affected by the speed. When the kinetic energy is accumulated to a certain degree, the load is automatically moved out to hit the seat and simulate the working condition.

[0006] The technical scheme adopted by the application is as follows: the application provides a test device for safety belt detection, which comprises a double-track acceleration assembly, a telescopic impact assembly, a speed adjusting assembly, a rotary driving assembly, an impact limiting assembly, an impact resetting assembly and a track mounting frame. The double-track acceleration assembly is arranged on the track mounting frame. The telescopic impact assembly is arranged on the rotary driving assembly. The speed adjusting assembly is arranged between the telescopic impact assembly and the rotary driving assembly. The impact resetting assembly is located on the side of the double-track acceleration assembly. The impact limiting assembly is arranged on the impact resetting assembly.

[0007] The double-track acceleration assembly comprises a double-ring track, and a connecting connecting ramp is arranged between the inner ring and the outer ring of the double-ring track.

[0008] When the inertia of the rotating part can overcome the elastic force of the pre-tightening spring, the rotating part has a tendency to switch from the inner ring to the outer ring through the connecting ramp.

[0009] Further, the double-track acceleration assembly further comprises a roller shaft and a rolling wheel, the roller shaft is arranged on the telescopic impact assembly, and the rolling wheel is rotatably arranged on the roller shaft and in rolling contact with the side wall of the double-ring track.

[0010] When the rolling wheel is located in the inner ring of the double-ring track, the impact head and the impact seat will not collide regardless of the number of rotations, so the impact head has sufficient acceleration time to accumulate kinetic energy. Based on this requirement, the device neither needs a large site to extend the acceleration distance nor a large-power motor to speed up quickly. Through the continuous rotation acceleration mode, both the site occupation and the specification of the driving part can be considered.

[0011] Further, the telescopic impact assembly comprises a sliding rod, a sliding sleeve and an impact head, the sliding rod is provided with a support, the support is fixedly connected to the rotating driving assembly, the sliding rod is further provided with a stop ring, the sliding sleeve is slidingly arranged on the sliding rod, and the impact head is fixedly connected to the outer side of the sliding sleeve.

[0012] When the rolling wheel is switched to the outer ring of the double-ring track, the impact head will impact the impact seat, and since the pre-tightening force of the pre-tightening spring is pre-set, the speed at the time of impact is within a certain range regardless of the acceleration time.

[0013] Further, the speed adjusting assembly comprises an adjusting screw rod, an adjusting nut and a pre-tightening spring, the adjusting screw rod is fixedly connected to the rotating driving assembly, the adjusting nut and the adjusting screw rod are in threaded transmission, the sliding sleeve is provided with a lower ear portion, the lower ear portion is sleeved on the adjusting screw rod, and the pre-tightening spring is arranged between the lower ear portion and the adjusting nut.

[0014] By rotating the adjusting nut, the pre-compression amount of the pre-tightening spring can be adjusted, so as to change the required speed when the rolling wheel is switched from the inner ring to the outer ring of the double-ring track, and further change the impact kinetic energy during the test.

[0015] Further, the rotating driving assembly comprises a rotating support shaft, a rotating sleeve and a counterweight, the rotating support shaft is arranged on the track mounting frame, the rotating sleeve is rotatably arranged on the rotating support shaft, and the rotating sleeve is driven to rotate by the motor.

[0016] Preferably, the rotating sleeve is provided with a flange part, the support is fixed to the flange part, the adjusting screw rod is fixed to the rotating sleeve, and the counterweight is arranged at the end of the sliding rod.

[0017] Further, the impact limiting assembly comprises a locking pin box, a lifting locking pin and a locking spring, the locking pin box is arranged on the impact reset assembly, the lifting locking pin is slidingly arranged in the locking pin box, and the locking spring is arranged between the locking pin box and the lifting locking pin.

[0018] Through locking of the lifting locking pin, the seat after impact sliding can be limited, direct rebound of the seat and secondary contact of the impact head are avoided, and rapid stopping of the seat after reaching the limit position can throw the dummy on the seat forward, so that a seat belt triggering scene in a traffic accident is simulated.

[0019] Further, the impact reset assembly comprises a sliding bottom plate, a sliding rail and a seat, the sliding rail is arranged on the sliding bottom plate, the seat is slidingly arranged on the sliding rail, and the sliding rail is provided with an impact seat matched with the impact head.

[0020] Preferably, the locking pin box is arranged on the sliding bottom plate, both ends of the sliding rail are provided with anti-collision blocks, and the seat is further provided with a limiting block, and the limiting block can be clamped and fixed through the lifting locking pin.

[0021] As a further preferred embodiment of the present application, the impact reset assembly further comprises a reset spring arranged between the sliding bottom plate and the seat.

[0022] The present application further provides a use method of the test device for seat belt detection, specifically comprising the following steps:

[0023] Step one: install the dummy on the seat and constrain the dummy through the installed seat belt; in the initial state, the rolling wheel is located in the inner ring of the double-ring track, and at this time, the sliding sleeve abuts against the stop ring;

[0024] Step two: rotate the rotating sleeve through the motor drive, and drive the telescopic impact assembly to rotate, along with the increase of the rotating speed of the rotating sleeve, the tendency of the sliding sleeve to expand outward gradually increases, and in this process, the pressure of the sliding sleeve on the pre-tightening spring gradually increases;

[0025] Step three: until the pressure of the sliding sleeve on the pre-tightening spring and the elastic force of the pre-tightening spring are balanced, the rolling wheel will gradually leave the inner wall of the inner ring of the double-ring track and gradually approach the outer wall of the inner ring of the double-ring track;

[0026] Step four: as the rotation speed of the rotating sleeve continues to increase, the pressure between the rolling wheel and the outer wall of the inner ring of the double-ring track gradually increases, and when the pre-tightening spring is squeezed to a certain extent, the rolling wheel enters the outer ring of the double-ring track through the ramp;

[0027] In this process, the sliding sleeve extends outward with the sliding sleeve, and the impact head rotates to the position of the seat and impacts the impact seat when the impact head rotates to the position of the seat, and the kinetic energy of the impact head is transmitted to the seat;

[0028] Step five: when the seat is impacted, the limit block pushes the lifting lock pin downward through the slope, and after the limit block passes the lifting lock pin, the lifting lock pin is bounced upward under the elastic force of the locking spring, preventing the seat from returning to the original position;

[0029] Step six: after the seat is stopped against the impact block, the dummy on the seat flies forward under the action of inertia, and at this time, the safety belt restrains the dummy, simulating the actual traffic accident and detecting the performance of the safety belt;

[0030] Step seven: since the seat does not automatically rebound after sliding forward, the next impact only needs to restart the motor to drive the rotating sleeve to rotate, and since the initial speed of the rotating sleeve is small, the rolling wheel rotates to another ramp and returns to the inner ring of the double-ring track from the outer ring of the double-ring track.

[0031] The beneficial effects of the application with the above structure are as follows:

[0032] (1) When the inertia of the rotating part can overcome the elastic force of the pre-tightening spring, it has the tendency to pass through the ramp and transfer from the inner ring to the outer ring.

[0033] (2) When the rolling wheel is in the inner ring of the double-ring track, the impact head and the impact seat will not collide regardless of the number of rotations, so the impact head has sufficient acceleration time to accumulate kinetic energy. Based on this requirement, the device does not need a large site to extend the acceleration distance, nor a large power motor to speed up quickly. Through the continuous rotation of the acceleration mode, both the site occupation and the specification of the driving part can be considered.

[0034] (3) When the rolling wheel is transferred to the outer ring of the double-ring track, it will be impacted by the impact head, and since the pre-tightening force of the pre-tightening spring is pre-set, the speed at the time of impact is within a certain range regardless of the acceleration time.

[0035] (4) By rotating the adjusting nut, the pre-compression of the pre-tightening spring can be adjusted, thereby changing the speed required for the rolling wheel to switch from the inner ring to the outer ring of the double-ring track, and thus changing the impact kinetic energy during the test.

[0036] (5) By locking the lifting lock pin, the seat can be limited after the impact and slide, avoiding the seat from rebounding directly and making secondary contact with the impact head. Furthermore, the rapid stop after the seat reaches the limit position can throw the dummy on the seat forward, thereby simulating the seat belt triggering scenario during a traffic accident. Attached Figure Description

[0037] Figure 1 This is a perspective view of a test device for seat belt detection proposed in this invention;

[0038] Figure 2 This is a front view of a test device for seat belt detection proposed in this invention;

[0039] Figure 3 for Figure 2 A cross-sectional view along the cutting line AA;

[0040] Figure 4 for Figure 3 A cross-sectional view along the cutting line BB;

[0041] Figure 5 for Figure 2 A cross-sectional view along the section line CC;

[0042] Figure 6 for Figure 3 A magnified view of a section at point I;

[0043] Figure 7 for Figure 3 Enlarged view of a section at point II;

[0044] Figure 8 for Figure 4 Enlarged view of a section at point III;

[0045] Figure 9 for Figure 5 A magnified view of a section at point IV.

[0046] Wherein, 1, double track acceleration assembly, 2, telescopic impact assembly, 3, speed regulating assembly, 4, rotary drive assembly, 5, impact limiting assembly, 6, impact reset assembly, 7, track mounting frame, 11, double ring track, 12, roller shaft, 13, rolling wheel, 21, sliding rod, 22, sliding sleeve, 23, impact head, 31, adjusting screw, 32, adjusting nut, 33, pre-tightening spring, 41, rotating support shaft, 42, rotating sleeve, 43, counterweight, 51, lock pin box, 52, lifting lock pin, 53, locking spring, 61, sliding base plate, 62, slide rail, 63, seat, 64, reset spring, 211, support, 212, stop ring, 221, lower ear, 421, flange part, 521, slope part, 522, push plate, 621, anti-collision block, 631, impact seat, 632, limiting block.

[0047] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with embodiments of the present application, and do not constitute a limitation on the present application. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0049] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0050] As shown in Figures 1-9 The present application provides a test device for safety belt detection, which comprises a double track acceleration assembly 1, a telescopic impact assembly 2, a speed regulating assembly 3, a rotary drive assembly 4, an impact limiting assembly 5, an impact reset assembly 6 and a track mounting frame 7. The double track acceleration assembly 1 is arranged on the track mounting frame 7, the telescopic impact assembly 2 is arranged on the rotary drive assembly 4, the speed regulating assembly 3 is arranged between the telescopic impact assembly 2 and the rotary drive assembly 4, the impact reset assembly 6 is located on the side of the double track acceleration assembly 1, and the impact limiting assembly 5 is arranged on the impact reset assembly 6.

[0051] The double-track accelerating assembly 1 comprises a double-ring track 11, and a connecting loop is arranged between the inner ring and the outer ring of the double-ring track 11.

[0052] When the inertia of the rotating part can overcome the elastic force of the pre-tightening spring 33, the rotating part has a tendency to switch from the inner ring to the outer ring through the connecting loop.

[0053] The double-track accelerating assembly 1 further comprises a roller shaft 12 and a rolling wheel 13, the roller shaft 12 is arranged on the telescopic impact assembly 2, the rolling wheel 13 is rotatably arranged on the roller shaft 12, and the rolling wheel 13 is in rolling contact with the side wall of the double-ring track 11.

[0054] When the rolling wheel 13 is located in the inner ring of the double-ring track 11, the impact head 23 and the impact seat 631 will not collide regardless of the number of rotations, so the impact head 23 has sufficient acceleration time to accumulate kinetic energy. Based on this requirement, the device neither needs a large site to extend the acceleration distance nor needs a large-power motor to speed up quickly. Through the continuous rotation accelerating mode, both the site occupation and the driving part specification can be considered.

[0055] The telescopic impact assembly 2 comprises a sliding rod 21, a sliding sleeve 22 and an impact head 23, the sliding rod 21 is provided with a support 211, the support 211 is fixedly connected to the rotating driving assembly 4, the sliding rod 21 is further provided with a stop ring 212, the sliding sleeve 22 is slidingly arranged on the sliding rod 21, and the impact head 23 is fixedly connected to the outer side of the sliding sleeve 22.

[0056] When the rolling wheel 13 is switched to the outer ring of the double-ring track 11, the impact head 23 will impact the impact seat 631, and since the pre-tightening force of the pre-tightening spring 33 is pre-set, the speed at the time of impact is within a certain range regardless of the acceleration time.

[0057] The speed adjusting assembly 3 comprises an adjusting screw 31, an adjusting nut 32 and a pre-tightening spring 33, the adjusting screw 31 is fixedly connected to the rotating driving assembly 4, the adjusting nut 32 is in threaded transmission with the adjusting screw 31, the sliding sleeve 22 is provided with a lower ear 221, the lower ear 221 is sleeved on the adjusting screw 31, and the pre-tightening spring 33 is arranged between the lower ear 221 and the adjusting nut 32.

[0058] By rotating the adjusting nut 32, the pre-compression amount of the pre-tightening spring 33 can be adjusted, so as to change the required speed when the rolling wheel 13 is switched from the inner ring to the outer ring of the double-ring track 11, and further change the impact kinetic energy during the test.

[0059] The rotating driving assembly 4 comprises a rotating support shaft 41, a rotating sleeve 42 and a counterweight 43, the rotating support shaft 41 is arranged on the track mounting frame 7, the rotating sleeve 42 is rotatably arranged on the rotating support shaft 41, and the rotating sleeve 42 is driven to rotate by a motor.

[0060] The flange part 421 is arranged on the rotating sleeve 42, the support 211 is fixedly connected to the flange part 421, the adjusting screw 31 is fixedly connected to the rotating sleeve 42, and the counterweight 43 is arranged at the end of the sliding rod 21.

[0061] The impact limiting assembly 5 comprises a locking pin box 51, a lifting locking pin 52 and a locking spring 53. The locking pin box 51 is arranged on the impact reset assembly 6, the lifting locking pin 52 is slidingly arranged in the locking pin box 51, and the locking spring 53 is arranged between the locking pin box 51 and the lifting locking pin 52.

[0062] Through the locking of the lifting locking pin 52, the seat 63 after the impact sliding can be limited, direct rebound and impact of the seat 63 and secondary contact of the impact head 23 are avoided, and the rapid stop of the seat 63 after reaching the limit position can throw the dummy on the seat 63 forward, so as to simulate the safety belt triggering scene in a traffic accident.

[0063] The impact reset assembly 6 comprises a sliding bottom plate 61, a sliding rail 62 and a seat 63. The sliding rail 62 is arranged on the sliding bottom plate 61, the seat 63 is slidingly arranged on the sliding rail 62, and the impact seat 631 matched with the impact head 23 is arranged on the sliding rail 62.

[0064] The locking pin box 51 is arranged on the sliding bottom plate 61, the both ends of the sliding rail 62 are provided with anti-collision blocks 621, and the limiting block 632 is further arranged on the seat 63. The limiting block 632 can be clamped and fixed by the lifting locking pin 52.

[0065] The impact reset assembly 6 further comprises a reset spring 64, which is arranged between the sliding bottom plate 61 and the seat 63.

[0066] In specific use, the dummy is installed on the seat 63, and the dummy is correctly constrained by the installed safety belt. In the initial state, the rolling wheel 13 is located in the inner ring of the double-ring track 11. At this time, since the sliding sleeve 22 has abutted against the stop ring 212, there is no excessive transverse extrusion force between the rolling wheel 13 and the double-ring track 11.

[0067] Then, the rotating sleeve 42 is driven to rotate by the motor, and the telescopic impact assembly 2 is driven to rotate. With the increase of the rotating speed of the rotating sleeve 42, the tendency of the sliding sleeve 22 to expand outward gradually increases. In this process, the pressure of the sliding sleeve 22 on the pre-tightening spring 33 gradually increases.

[0068] Until the pressure of the sliding sleeve 22 on the pre-tightening spring 33 balances with the elastic force of the pre-tightening spring 33, the rolling wheel 13 gradually leaves the inner wall of the inner ring of the double-ring track 11 and gradually approaches the outer wall of the inner ring of the double-ring track 11.

[0069] With the rotation speed of the rotating sleeve 42 continuing to increase, the pressure between the rolling wheel 13 and the outer wall of the inner ring of the double ring track 11 gradually increases, and when the pre-tightening spring 33 is pressed to the extent that allows the rolling wheel 13 to enter the loop from the inner ring of the double ring track 11, the rolling wheel 13 enters the outer ring of the double ring track 11 through the loop.

[0070] In this process, the sliding sleeve 22 extends outward with the sliding sleeve 22, and when the impact head 23 rotates to the position of the seat 63, the impact head 23 impacts the impact seat 631, and the kinetic energy of the impact head 23 is transmitted to the seat 63.

[0071] When the seat 63 is impacted, it first slides forward quickly, and the limiting block 632 pushes the lifting lock pin 52 downward through the slope portion 521. After the limiting block 632 passes the lifting lock pin 52, the lifting lock pin 52 is bounced upward under the elastic force of the locking spring 53, preventing the seat 63 from resetting.

[0072] After the seat 63 abuts against the impact block 621, it stops quickly, and the dummy on the seat 63 flies forward under the action of inertia. At this time, the safety belt restrains the dummy, simulates the actual traffic accident, and can also detect the performance of the safety belt.

[0073] Since the seat 63 does not automatically rebound after sliding forward, the next time the seat 63 is impacted, the motor needs to be started again to drive the rotating sleeve 42 to rotate. Since the initial speed of the rotating sleeve 42 is small, when the rolling wheel 13 rotates to another loop, it returns to the inner ring of the double ring track 11 from the outer ring of the double ring track 11.

[0074] In the subsequent acceleration process, the seat 63 can be reset, and the resetting methods of the seat 63 include but are not limited to the following two methods:

[0075] First, manually press the lever 522 downward to lower the lifting lock pin 52, and the seat 63 is reset under the pulling force of the resetting spring 64.

[0076] Second, an electromagnet is arranged between the lock pin box 51 and the lifting lock pin 52, and the lifting lock pin 52 is lowered under the attraction force of the electromagnet when the electromagnet is energized, and the seat 63 is reset under the pulling force of the resetting spring 64.

[0077] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; thus the use of any

[0078] The above description of the application and its embodiments is not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the application, and the actual structure is not limited thereto. In general, if a person skilled in the art is inspired by it, without departing from the purpose of the application, without creative design, similar structure and embodiments of the technical solution can be designed, which should belong to the protection scope of the application.

Claims

1. A testing device for seat belt detection, characterized in that: The device includes a dual-track acceleration assembly (1), a telescopic impact assembly (2), a speed adjustment assembly (3), a rotary drive assembly (4), an impact limiting assembly (5), an impact reset assembly (6), and a track mounting frame (7). The dual-track acceleration assembly (1) is mounted on the track mounting frame (7), the telescopic impact assembly (2) is mounted on the rotary drive assembly (4), the speed adjustment assembly (3) is located between the telescopic impact assembly (2) and the rotary drive assembly (4), the impact reset assembly (6) is located on the side of the dual-track acceleration assembly (1), and the impact limiting assembly (5) is mounted on the impact reset assembly (6). The dual-track acceleration assembly (1) includes a dual-ring track (11), and a connecting ramp is provided between the inner and outer rings of the dual-ring track (11). The dual-track acceleration assembly (1) also includes a roller shaft (12) and a rolling wheel (13). The roller shaft (12) is mounted on the telescopic impact assembly (2), and the rolling wheel (13) is rotatably mounted on the roller shaft (12). The rolling wheel (13) makes rolling contact with the side wall of the double-ring track (11). The telescopic impact assembly (2) includes a sliding rod (21), a sliding sleeve (22), and an impact head (23). The sliding rod (21) is provided with a support (211), which is fixed to the rotary drive assembly (4). The sliding rod (21) is also provided with a stop ring (212). The sliding sleeve (22) is slidably disposed on the sliding rod (21), and the impact head (23) is fixed to the outside of the sliding sleeve (22). The speed adjustment assembly (3) includes an adjusting screw (31), an adjusting nut (32), and a preload spring (33). The adjusting screw (31) is fixed to the rotary drive assembly (4). The adjusting nut (32) and the adjusting screw (31) are connected by a threaded drive. The sliding sleeve (22) is provided with a lower ear (221). The lower ear (221) is sleeved on the adjusting screw (31). The preload spring (33) is located between the lower ear (221) and the adjusting nut (32). The rotary drive assembly (4) includes a rotary support shaft (41), a rotary sleeve (42), and a counterweight (43). The rotary support shaft (41) is mounted on the track mounting frame (7), and the rotary sleeve (42) is rotatably mounted on the rotary support shaft (41). The rotary sleeve (42) is driven to rotate by a motor. The rotating sleeve (42) is provided with a flange (421), the support (211) is fixed to the flange (421), the adjusting screw (31) is fixed to the rotating sleeve (42), and the counterweight (43) is located at the end of the sliding rod (21).

2. The testing device for seat belt detection according to claim 1, characterized in that: The impact limiting component (5) includes a locking pin box (51), a lifting locking pin (52), and a locking spring (53). The locking pin box (51) is located on the impact reset component (6). The lifting locking pin (52) is engaged and slidably located in the locking pin box (51). The locking spring (53) is located between the locking pin box (51) and the lifting locking pin (52).

3. The testing device for seat belt detection according to claim 2, characterized in that: The impact reset assembly (6) includes a sliding base plate (61), a slide rail (62) and a seat (63). The slide rail (62) is disposed on the sliding base plate (61), and the seat (63) is slidably disposed on the slide rail (62). The slide rail (62) is provided with an impact seat (631) that cooperates with the impact head (23).

4. The testing device for seat belt detection according to claim 3, characterized in that: The locking pin box (51) is located on the sliding base plate (61), and anti-collision blocks (621) are provided at both ends of the slide rail (62). The seat (63) is also provided with a limiting block (632). The limiting block (632) can be locked and fixed by lifting the locking pin (52). The impact reset assembly (6) also includes a reset spring (64) disposed between the sliding base plate (61) and the seat (63).

5. The method of using the testing device for seat belt detection according to claim 4, characterized in that, Includes the following steps: Step 1: Install the dummy on the seat (63) and restrain the dummy with the installed seat belt; in the initial state, the rolling wheel (13) is located in the inner ring of the double ring track (11), and at this time the sliding sleeve (22) abuts against the stop ring (212). Step 2: Drive the rotating sleeve (42) to rotate by the motor, and drive the telescopic impact component (2) to rotate. As the rotation speed of the rotating sleeve (42) increases, the tendency of the sliding sleeve (22) to expand outward gradually increases. During this process, the pressure of the sliding sleeve (22) on the preload spring (33) gradually increases. Step 3: When the pressure of the sliding sleeve (22) on the preload spring (33) is balanced with the elastic force of the preload spring (33), the rolling wheel (13) will gradually move away from the inner wall of the inner ring of the double ring track (11) and gradually approach the outer wall of the inner ring of the double ring track (11). Step 4: As the rotational speed of the rotating sleeve (42) continues to increase, the pressure between the rolling wheel (13) and the outer wall of the inner ring of the double ring track (11) gradually increases. When the preload spring (33) is squeezed to the extent that the rolling wheel (13) is allowed to enter the ramp from the inner ring of the double ring track (11), the rolling wheel (13) will enter the outer ring of the double ring track (11) through the ramp. During this process, the sliding sleeve (22) extends outward with the sliding sleeve (22), and when the extended impact head (23) rotates to the position of the seat (63), it will impact the impact seat (631) and transfer its kinetic energy to the seat (63); Step 5: When the seat (63) is impacted, it will first slide forward quickly. The limit block (632) pushes the lifting lock pin (52) downward through the ramp (521). After the limit block (632) passes the lifting lock pin (52), the lifting lock pin (52) will rebound and rise under the elastic force of the locking spring (53) to prevent the seat (63) from resetting. Step 6: After the seat (63) comes to a stop against the anti-collision block (621), the dummy on the seat (63) will fly forward under the action of inertia. At this time, the seat belt restrains the dummy, simulating the situation of an actual traffic accident, and can also test the performance of the seat belt. Step 7: Since the seat (63) will not automatically rebound after sliding forward, the next time it impacts, you only need to restart the motor to drive the rotating sleeve (42) to rotate. Since the initial speed of the rotating sleeve (42) is small, when the rolling wheel (13) rotates to another ramp, it will return from the outer ring of the double ring track (11) to the inner ring of the double ring track (11).

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