A device and method for testing the tensile strength of automotive seat belts

Abstract

This invention relates to the field of seat belt testing technology, specifically to a vehicle seat belt tensile testing device and method, comprising: a test platform, and a bracket and guide column fixed on the test platform, a top plate fixed to the top of the bracket, and a clamping assembly disposed on the bracket; a lifting and pulling assembly disposed on the test platform and connected to the guide column, including a counterweight; an energy storage assembly disposed on the guide column and connected to the lifting and pulling assembly, used to provide a thrust to the counterweight toward the test platform through the lifting and pulling assembly; and a multi-stage buffer mechanism disposed on the test platform, wherein a limiting mechanism connected to the multi-stage buffer mechanism is also disposed on the test platform. This application can, through the cooperation of the multi-stage buffer mechanism and the limiting mechanism, disperse the stress concentration caused by the impact of the counterweight when the seat belt breaks due to the impact of the counterweight.

Description

Technical Field

[0001] This invention relates to the field of seat belt testing technology, specifically to a device and method for testing the tensile strength of automotive seat belts. Background Technology

[0002] Car seat belts are one of the most important passive safety devices in a vehicle, effectively reducing the risk of injury to occupants during collisions or sudden braking. Therefore, it is necessary to test the tensile strength of seat belts.

[0003] Seat belt tensile tests can be divided into static tests and dynamic tests. Static tests usually involve fixing both ends of the seat belt and slowly increasing the tension on the seat belt until it breaks. Dynamic tests usually involve simulating an instantaneous impact force on the seat belt and observing whether the seat belt breaks.

[0004] Since seat belts are effective only when the instantaneous force generated during a car collision occurs, dynamic impact is particularly important in seat belt testing. Existing dynamic impact testing methods work by pulling a heavy object to a certain height and converting the gravitational potential energy into impact force, which is then applied to the seat belt.

[0005] If the seatbelt breaks due to impact, the weight will continue to move and impact the test bench, which may damage the test bench.

[0006] To address this, a spring can be installed on the test bench to provide a certain buffering force to the weight, thus protecting the test bench. However, when the weight acts on the spring, stress concentration will occur, and uneven force on the spring can easily lead to unbalanced loading, resulting in uneven contact pressure distribution between the inner wall of the weight and the guide column, forming unilateral friction. Summary of the Invention

[0007] The purpose of this invention is to provide an automotive seatbelt tensile testing device and method to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A device for testing the tensile strength of automotive seat belts, comprising:

[0010] The test stand, and the bracket and guide column fixed on the test stand, with a top plate fixed on the top of the bracket and clamping components on the bracket;

[0011] Also includes:

[0012] A lifting and pulling assembly is mounted on the test bench and connected to the guide column, including a counterweight block;

[0013] An energy storage component, mounted on the guide column and connected to the lifting and pulling component, is used to provide the counterweight block with a thrust toward the test platform via the lifting and pulling component.

[0014] A multi-stage buffer mechanism is installed on a test bench, and the test bench is also equipped with a limiting mechanism connected to the multi-stage buffer mechanism. The limiting mechanism can perform a limiting action on the multi-stage buffer mechanism according to the degree of deformation of the multi-stage buffer mechanism.

[0015] As a further aspect of the present invention: the lifting and pulling assembly includes a winding device rotatably mounted on the test bench, a movable plate fixedly connected to the counterweight block is axially slidable on the guide column, a connecting roller is fixedly mounted on the movable plate, and a steel wire rope fixedly connected to the connecting roller is wound on the winding device.

[0016] As a further embodiment of the present invention: the energy storage component includes a connecting plate fixed to the end of the guide column, a support sleeve fixed on the connecting plate, a support rod axially sliding inside the support sleeve, a limiting wheel fixed at the end of the support rod that abuts against the movable plate, and a first spring sleeved on the support sleeve and the support rod, the two ends of the first spring abutting against the connecting plate and the limiting wheel respectively.

[0017] As a further embodiment of the present invention: the multi-stage buffer mechanism includes a limiting ring fixed on the guide post, a sliding sleeve slidably on the guide post, a support plate fixed on the sliding sleeve, and a second spring sleeved on the guide post, with the two ends of the second spring abutting against the support plate and the limiting ring respectively.

[0018] As a further embodiment of the present invention: the multi-stage buffer mechanism further includes a plurality of hinged sleeves hinged to the support plate and distributed equidistantly in a circle, a receiving rod sliding axially inside the hinged sleeve, a support wheel hinged to the end of the receiving rod and abutting against the guide post, and a third spring sleeved on the hinged sleeve and the receiving rod.

[0019] As a further embodiment of the present invention: a limiting block for limiting the sway angle of the hinged sleeve is fixed on the support plate.

[0020] As a further embodiment of the present invention: the limiting mechanism includes a fixed plate fixed on the test bench, a movable rod slidably mounted on the fixed plate, and a limiting plate fixed to the end of the movable rod.

[0021] As a further embodiment of the present invention: the limiting mechanism further includes a movable ring fixed on the movable rod and in contact with the fixed plate, and a fourth spring is sleeved on the movable rod, with the two ends of the fourth spring abutting against the fixed plate and the limiting plate respectively.

[0022] As a further embodiment of the present invention: the clamping assembly includes a second clamping plate and a cylinder fixed on the bracket, and the telescopic end of the cylinder is fixed with a first clamping plate that cooperates with the second clamping plate.

[0023] A method for testing the tensile strength of a car seatbelt includes the following steps:

[0024] Step 1: Under the action of the clamping component, the two ends of the safety belt to be tested are clamped and fixed. At the same time, under the action of the lifting and pulling component, the height of the counterweight is adjusted and the energy storage component is moved.

[0025] Step 2: When the counterweight reaches the required height, the lifting and pulling assembly releases the counterweight and, under the action of the energy storage assembly, provides the counterweight with a thrust toward the test platform.

[0026] Step 3: When the counterweight impacts the seat belt, the impact force that the seat belt can withstand can be tested;

[0027] Step 4: If the seat belt breaks due to impact, the counterweight will act on the multi-stage buffer mechanism, which works in conjunction with the limiting mechanism to cushion the counterweight.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows: This application can provide sufficient impact force to the seat belt through the dual combination of elastic potential energy and gravity release, and buffer and decompose the impact force of the counterweight when the seat belt breaks, so as to ensure the safe use of the device. Specifically, under the action of the lifting and pulling component, the height of the counterweight is raised. The lifting and pulling component also drives the energy storage component to move, thereby providing elastic potential energy to the counterweight. When the counterweight is raised to the required height, through the dual action of gravitational potential energy and elastic potential energy, the counterweight reaches the required impact force and acts on the seat belt. If the seat belt breaks due to impact, the counterweight will continue to move towards the test platform. The multi-stage buffer mechanism can disperse the impact force of the counterweight into vertical and horizontal directions. The horizontal force impacts the guide column, which can provide a certain support force to the guide column to ensure that the guide column always remains stable. The vertical force is dispersed into multiple smaller forces in a distributed manner, thereby ensuring that the impact force of the counterweight is effectively dispersed and avoiding the problem of stress concentration during impact.

[0029] The greater the compression of the first spring, the greater the thrust it can provide to the counterweight. Therefore, under the combined action of gravitational potential energy and elastic potential energy, the impact force on the seat belt can be changed according to the lifting height of the counterweight, thereby freely adjusting the magnitude of the impact force to meet the testing force required by different seat belts and increasing the range of applications of the device. At the same time, when the lifting height of the counterweight is within a certain range, the change in elastic potential energy can ensure that the impact force provided by the counterweight meets the required requirements, thereby reducing the height and floor space of the entire device.

[0030] By coordinating the second and third springs, the impact force of the counterweight can be decomposed into horizontal and vertical forces to prevent stress concentration during the impact. Furthermore, as the angle between the hinged sleeve and the support plate decreases due to the impact, the vertical force is controlled to decrease, reducing the vertical load on the system. Simultaneously, the horizontal force is gradually increased, increasing the lateral constraint force of the support wheel on the guide column, thus enhancing the stability of the guide column. Similarly, the increased friction between the support wheel and the guide column further absorbs impact energy through frictional energy dissipation, effectively suppressing the vertical displacement of the support wheel and reducing the oscillation amplitude of the entire system. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of one embodiment of a car seatbelt tensile testing device.

[0032] Figure 2 This is a structural schematic diagram of another angle in one embodiment of the automotive seatbelt tensile testing device.

[0033] Figure 3 for Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0034] Figure 4 This is a schematic diagram of the structure of the energy storage component, the movable plate, and the counterweight in one embodiment of the automotive seat belt tensile testing device.

[0035] Figure 5 This is a schematic diagram of the exploded structure of the energy storage component in one embodiment of a car seatbelt tensile testing device.

[0036] Figure 6 This is a schematic diagram of the multi-stage buffer mechanism in one embodiment of an automotive seatbelt tensile testing device.

[0037] Figure 7 This is an exploded structural diagram of a multi-stage buffer mechanism in one embodiment of an automotive seatbelt tensile testing device.

[0038] Figure 8 This is a schematic diagram of the limiting mechanism in one embodiment of an automotive seatbelt tensile testing device.

[0039] Figure 9 This is an exploded structural diagram of the limiting mechanism in one embodiment of an automotive seatbelt tensile testing device.

[0040] Figure 10 This is a schematic diagram of the clamping component in one embodiment of an automotive seatbelt tensile testing device.

[0041] In the diagram: 1. Test bench; 2. Support frame; 3. Top plate; 4. Guide column; 401. Limiting ring; 5. Connecting plate; 6. Winding device; 7. Connecting roller; 8. Steel wire rope; 9. Movable plate; 10. Counterweight; 11. Support sleeve; 12. Support rod; 13. Limiting wheel; 14. First spring; 15. Cylinder; 16. First clamping plate; 17. Second clamping plate; 18. Sliding sleeve; 19. Support plate; 20. Second spring; 21. Hinge sleeve; 2101. Limiting stop; 22. Receiving rod; 23. Supporting wheel; 24. Third spring; 25. Fixed plate; 26. Movable rod; 2601. Movable ring; 27. Limiting plate; 28. Fourth spring. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Furthermore, elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0044] Please see Figures 1-10 In this embodiment of the invention, a vehicle seatbelt tensile testing device includes:

[0045] Test bench 1, and bracket 2 and guide column 4 fixed on test bench 1, top plate 3 fixed on top of bracket 2, and clamping assembly provided on bracket 2;

[0046] Also includes:

[0047] A lifting and pulling assembly is mounted on the test bench 1 and connected to the guide column 4, and includes a counterweight 10.

[0048] An energy storage component is disposed on the guide column 4 and connected to the lifting and pulling component, and is used to provide the counterweight 10 with a thrust toward the test platform 1 through the lifting and pulling component;

[0049] A multi-stage buffer mechanism is provided on a test bench 1. The test bench 1 is also provided with a limiting mechanism connected to the multi-stage buffer mechanism. The limiting mechanism can perform a limiting action on the multi-stage buffer mechanism according to the degree of deformation of the multi-stage buffer mechanism.

[0050] Specifically, when testing the seat belt, the test result can be achieved through the impact of the counterweight 10. This is done by clamping and fixing both ends of the seat belt under the counterweight 10 using a clamping assembly. Simultaneously, the lifting and pulling assembly raises the height of the counterweight 10, continuously increasing its gravitational potential energy. The lifting and pulling assembly also drives the energy storage assembly, which provides elastic potential energy to the counterweight 10. When the counterweight 10 reaches the required height, the lifting and pulling assembly stops providing traction, allowing the counterweight 10 to fall freely under gravity. At the same time, the energy storage assembly provides a thrust towards the test platform 1, increasing the initial velocity of the counterweight 10 and thus increasing its impact force on the seat belt. When the counterweight 10 impacts the seat belt… The maximum impact force that the seat belt can withstand can be recorded. If the seat belt breaks due to the impact, the counterweight 10 will continue to move towards the test platform 1 and act on the multi-stage buffer mechanism through the lifting and pulling components. The multi-stage buffer mechanism can disperse the impact force of the counterweight 10 into the vertical and horizontal directions. The horizontal force impacts the guide post 4. Since this force is evenly distributed in the circumferential direction, it can provide a certain support force to the guide post 4 to ensure that the guide post 4 always remains stable. The vertical force is dispersed into multiple smaller forces in a distributed manner, thereby ensuring that the impact force of the counterweight 10 is effectively dispersed and avoiding the problem of stress concentration during the impact. Under the action of the limiting mechanism, the multi-stage buffer mechanism can be limited when the impact force is too large, so as to ensure that the multi-stage buffer mechanism will not vibrate continuously, which would affect the seat belt test data.

[0051] Please see Figure 1 , Figure 2 , Figure 10 The clamping assembly includes a second clamping plate 17 fixed on the bracket 2 and a cylinder 15. The telescopic end of the cylinder 15 is fixed with a first clamping plate 16 that cooperates with the second clamping plate 17.

[0052] Please see Figure 1 , Figure 2 , Figure 4 The lifting and pulling assembly includes a winding reel 6 rotatably mounted on the test bench 1, a movable plate 9 axially sliding on the guide column 4 and fixedly connected to the counterweight block 10, a connecting roller 7 fixed on the movable plate 9, and a wire rope 8 fixedly connected to the connecting roller 7 wound on the winding reel 6.

[0053] Please see Figure 1 , Figure 2 , Figure 4 , Figure 5 The energy storage component includes a connecting plate 5 fixed to the end of the guide column 4, a support sleeve 11 fixed on the connecting plate 5, a support rod 12 axially sliding inside the support sleeve 11, a limiting wheel 13 fixed at the end of the support rod 12 to abut against the movable plate 9, and a first spring 14 sleeved on the support sleeve 11 and the support rod 12, with the two ends of the first spring 14 abutting against the connecting plate 5 and the limiting wheel 13 respectively.

[0054] In detail, a force sensor is installed on the first clamping plate 16 to measure the force exerted on the seat belt when it is impacted. The clamping surfaces of the first clamping plate 16 and the second clamping plate 17 are provided with multiple wedge-shaped blocks that are evenly distributed. When the cylinder 15 pushes the first clamping plate 16 toward the second clamping plate 17, the seat belt to be tested is clamped under the action of the first clamping plate 16 and the second clamping plate 17. At the same time, the friction force on the seat belt is increased under the action of the wedge-shaped blocks to ensure that the seat belt will not loosen when it is impacted.

[0055] The inner wall of the support sleeve 11 has a locking groove, and the outer wall of the support rod 12 has a locking block that slides and engages with the locking groove. Under the action of the locking groove and the locking block, the support rod 12 will not detach from the support sleeve 11. In the initial state, the movable plate 9 and the limiting wheel 13 are separated, and the support rod 12 is located at the end of its stroke away from the support sleeve 11, so that the distance between the limiting wheel 13 and the connecting plate 5 is the largest. The elongation of the first spring 14 in its natural state is greater than the maximum distance between the limiting wheel 13 and the connecting plate 5. Therefore, the first spring 14 is in a pre-compressed state, so that the limiting wheel 13 always has a thrust in the direction away from the connecting plate 5.

[0056] When the seat belt needs to be tested, the reel 6 works and winds up the wire rope 8, thereby driving the movable plate 9 to slide along the axial direction of the guide column 4 through the connecting roller 7. The movable plate 9 will drive the counterweight 10 to move, so that the height of the counterweight 10 will continuously increase, thereby increasing the gravitational potential energy of the counterweight 10. When the movable plate 9 rises to a certain height, the movable plate 9 will abut against the limit wheel 13, thereby driving the support rod 12 to move into the support sleeve 11. The limit wheel 13 will also compress the first spring 14, so that the elastic potential energy of the first spring 14 will gradually increase.

[0057] Once the counterweight 10 is raised to the required height, the cable reel 6 stops working. At this point, the counterweight 10 can be released. In the initial stage of release, the counterweight 10 will be subjected to both gravitational potential energy and elastic potential energy. Specifically, the first spring 14 is released elastically and pushes the limit wheel 13 to move rapidly away from the connecting plate 5. The limit wheel 13 also drives the support rod 12 to move away from the support sleeve 11. Under the action of the limit wheel 13, the elastic potential energy stored in the first spring 14 is converted into a thrust on the movable plate 9, causing the initial speed of the counterweight 10 to increase rapidly. When the movable plate 9 separates from the limit wheel 13, the counterweight 10 undergoes free fall, causing the impact force of the counterweight 10 to gradually increase. When the counterweight 10 impacts the seat belt, the magnitude of the impact force on the seat belt can be recorded under the action of the force sensor, thereby effectively testing the seat belt.

[0058] Preferably, the greater the compression of the first spring 14, the greater the thrust it can provide to the counterweight 10. In this way, under the dual action of gravitational potential energy and elastic potential energy, the impact force on the seat belt can be changed according to the lifting height of the counterweight 10, thereby freely adjusting the magnitude of the impact force to meet the test force required by different seat belts and increasing the application range of the device. At the same time, when the lifting height of the counterweight 10 is within a certain range, the change in elastic potential energy can ensure that the impact force provided by the counterweight 10 meets the requirements, thereby reducing the height and floor space of the entire device.

[0059] Please see Figures 1-3 , Figure 6 , Figure 7The multi-stage buffer mechanism includes a limiting ring 401 fixed on the guide post 4, a sliding sleeve 18 slidably on the guide post 4, a support plate 19 fixed on the sliding sleeve 18, a second spring 20 sleeved on the guide post 4, the two ends of the second spring 20 abutting against the support plate 19 and the limiting ring 401 respectively, the multi-stage buffer mechanism also includes a plurality of hinged sleeves 21 hinged on the support plate 19 and distributed equidistantly around the circumference, a receiving rod 22 slidably on the hinged sleeve 21, a support wheel 23 hinged at the end of the receiving rod 22 abutting against the guide post 4, a third spring 24 sleeved on the hinged sleeve 21 and the receiving rod 22, and a limiting block 2101 fixed on the support plate 19 for limiting the deflection angle of the hinged sleeve 21.

[0060] Please see Figure 1 , Figure 2 , Figure 8 , Figure 9 The limiting mechanism includes a fixed plate 25 fixed on the test bench 1, a movable rod 26 slidably mounted on the fixed plate 25, a limiting plate 27 fixed at the end of the movable rod 26, and a movable ring 2601 fixed on the movable rod 26 and in contact with the fixed plate 25. A fourth spring 28 is sleeved on the movable rod 26, and the two ends of the fourth spring 28 abut against the fixed plate 25 and the limiting plate 27, respectively.

[0061] Furthermore, there are four support wheels 23 evenly distributed around the guide post 4. In the initial state, the receiving rod 22 is located at the end of its stroke away from the hinge sleeve 21, making the distance between the support wheel 23 and the support plate 19 the largest. The extension of the third spring 24 in its natural state is greater than the maximum distance between the support wheel 23 and the support plate 19. Therefore, the third spring 24 is in a pre-compressed state and always provides a thrust to the support wheel 23 and the hinge sleeve 21 in a direction away from each other. Under the action of this thrust, the included angle between the hinge sleeve 21 and the support plate 19 is the largest, and the hinge sleeve 21 has a tendency to swing away from the guide post 4. Under the action of the limiting block 2101, the included angle of the hinge sleeve 21 no longer changes. In this state, the second spring 20 is only subjected to the gravity of the support plate 19, the hinge sleeve 21, the receiving rod 22, and the support wheel 23. Therefore, the second spring 20 is in a slightly compressed state.

[0062] The limiting plate 27 is triangularly inclined, and the inclined surface of the limiting plate 27 can abut against the support plate 19. The movable rod 26 extends out of the fixed plate 25 to the maximum length, so that the movable ring 2601 abuts against the fixed plate 25. The extension of the fourth spring 28 in its natural state is greater than the maximum extension of the movable rod 26. Therefore, the fourth spring 28 is in a pre-compressed state and always provides the limiting plate 27 with a thrust in the direction away from the fixed plate 25. When the support wheel 23 is not subjected to force, the support plate 19 and the limiting plate 27 are in a separated state.

[0063] When the counterweight 10 impacts the seat belt, the impact force on the seat belt can be recorded by the force sensor. If the seat belt does not break due to the impact, the counterweight 10 will not contact the support wheel 23 due to the obstruction of the seat belt. If the seat belt breaks due to the impact, the counterweight 10 will continue to move towards the support wheel 23 until the movable plate 9 abuts against the support wheel 23. The impact force of the counterweight 10 will be transmitted to the support wheel 23 through the movable plate 9, thereby driving the support wheel 23 to move towards the test platform 1. Since the hinge sleeve 21 has a certain tilt angle, the force acting on the support wheel 23 will be decomposed into two forces in the horizontal and vertical directions. The horizontal impact force will be transmitted to the guide column 4. Since the four support wheels 23 are equidistantly distributed in a circle, the force acting on the guide column 4 will cancel each other out and be converted into a supporting force on the guide column 4 to ensure that the guide column 4 always remains stable.

[0064] Simultaneously, the vertical force will control the support wheel 23 to move towards the support plate 19, causing the receiving rod 22 to move towards the hinge sleeve 21, thereby compressing the third spring 24. During this process, the angle between the hinge sleeve 21 and the support plate 19 continuously decreases, causing the vertical force borne by the hinge sleeve 21 to continuously decrease. The four hinge sleeves 21 can also decompose the vertical force into four smaller forces, which act on the support plate 19, thereby compressing the second spring 20.

[0065] Preferably, the cooperation of the second spring 20 and the third spring 24 can decompose the impact force of the counterweight 10 into horizontal and vertical forces to prevent stress concentration during the impact. It can also control the vertical force to decrease as the angle between the hinge sleeve 21 and the support plate 19 decreases due to the impact, thereby reducing the vertical load of the system and gradually increasing the horizontal force. This increases the lateral constraint force of the support wheel 23 on the guide column 4, thereby enhancing the stability of the guide column 4. Similarly, it increases the friction between the support wheel 23 and the guide column 4, further absorbing the impact energy through friction energy dissipation, effectively suppressing the vertical displacement of the support wheel 23, thereby reducing the oscillation amplitude of the entire system.

[0066] Since the impact force is decomposed, the force acting on the second spring 20 will not be too large. Even if the second spring 20 deviates from the axis of the guide post 4 when it is compressed, the force has been decomposed onto the sliding sleeve 18. When the second spring 20 is reset, it will not directly act on the counterweight 10. Therefore, it will not cause the counterweight 10 to tilt, thus avoiding the problem of one-sided friction between the counterweight 10 and the guide post 4.

[0067] If the impact force of the counterweight 10 is large, the entire system will be in a continuous oscillation state when the second spring 20 and the third spring 24 are elastically reset. The oscillation may be transmitted to the mechanical sensor through the test bench 1. Since the sampling rate of the mechanical sensor is limited, if the system is in a continuous oscillation state, it may cause the sampling of the mechanical sensor to fail or cause phase delay. Therefore, it is necessary to suppress the oscillation.

[0068] When the impact force of the counterweight 10 is small, the oscillation amplitude and duration are small due to the damping effect of the support wheel 23. When the impact force of the counterweight 10 is too large, the axial displacement of the support plate 19 in the guide column 4 increases. When the support plate 19 abuts against the inclined surface of the limiting plate 27, the limiting plate 27 will give way and drive the movable rod 26 to move, causing the movable ring 2601 to separate from the fixed plate 25. At the same time, the limiting plate 27 will also compress the fourth spring 28. When the support plate 19 separates from the limiting plate 27, the fourth spring 28 is released elastically, causing the limiting plate 27 to reset. When the support plate 19 is displaced to its maximum value, the second spring 20 is released elastically, causing the support plate 19 to reset. During the reset process, the support plate 19 will abut against the horizontal surface of the limiting plate 27. Under the action of the limiting plate 27, the support plate 19 is limited, thereby suppressing the generation of oscillation.

[0069] A method for testing the tensile strength of a car seatbelt includes the following steps:

[0070] Step 1: Under the action of the clamping component, the two ends of the safety belt to be tested are clamped and fixed. At the same time, under the action of the lifting and pulling component, the height of the counterweight 10 is adjusted, and the energy storage component is moved.

[0071] Step 2: When the counterweight 10 reaches the required height, the lifting and pulling assembly releases the counterweight 10 and, under the action of the energy storage assembly, provides the counterweight 10 with a thrust toward the test platform 1.

[0072] Step 3: When the counterweight 10 impacts the seat belt, the impact force that the seat belt can withstand can be tested;

[0073] Step 4: If the seat belt breaks due to impact, the counterweight 10 will act on the multi-stage buffer mechanism, which works in conjunction with the limiting mechanism to buffer the counterweight 10.

[0074] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0075] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A device for testing the tensile strength of a car seatbelt, comprising: The test stand, and the bracket and guide column fixed on the test stand, with a top plate fixed on the top of the bracket and clamping components on the bracket; Its characteristic is that it further includes: A lifting and pulling assembly is mounted on the test bench and connected to the guide column, including a counterweight block; An energy storage component, mounted on the guide column and connected to the lifting and pulling component, is used to provide the counterweight block with a thrust toward the test platform via the lifting and pulling component. A multi-stage buffer mechanism is installed on a test bench, and the test bench is also equipped with a limiting mechanism connected to the multi-stage buffer mechanism. The limiting mechanism can perform a limiting action on the multi-stage buffer mechanism according to the degree of deformation of the multi-stage buffer mechanism. The multi-stage buffer mechanism includes a limiting ring fixed on the guide post, a sliding sleeve that slides axially on the guide post, a support plate fixed on the sliding sleeve, and a second spring sleeved on the guide post, with the two ends of the second spring abutting against the support plate and the limiting ring, respectively. The multi-stage buffer mechanism also includes a plurality of hinged sleeves that are hinged to the support plate and are distributed equidistantly around the circumference. A support rod slides axially inside the hinged sleeve. A support wheel that abuts against the guide post is hinged to the end of the support rod. A third spring is sleeved on the hinged sleeve and the support rod. The support plate is fixed with a limiting block for limiting the sway angle of the hinged sleeve.

2. The automotive seatbelt tensile testing device according to claim 1, characterized in that, The lifting and pulling assembly includes a winding device rotatably mounted on the test bench, a movable plate axially sliding on the guide column and fixedly connected to the counterweight, a connecting roller fixedly mounted on the movable plate, and a wire rope fixedly connected to the connecting roller wound on the winding device.

3. The automotive seatbelt tensile testing device according to claim 2, characterized in that, The energy storage component includes a connecting plate fixed to the end of the guide column, a support sleeve fixed on the connecting plate, a support rod axially sliding inside the support sleeve, a limiting wheel fixed at the end of the support rod that abuts against the movable plate, and a first spring sleeved on the support sleeve and the support rod, with the two ends of the first spring abutting against the connecting plate and the limiting wheel, respectively.

4. The automotive seatbelt tensile testing device according to claim 1, characterized in that, The limiting mechanism includes a fixed plate fixed on the test bench, a movable rod slidably mounted on the fixed plate, and a limiting plate fixed to the end of the movable rod.

5. The automotive seatbelt tensile testing device according to claim 4, characterized in that, The limiting mechanism also includes a movable ring fixed on the movable rod and in contact with the fixed plate. A fourth spring is sleeved on the movable rod, and the two ends of the fourth spring abut against the fixed plate and the limiting plate, respectively.

6. The automotive seatbelt tensile testing device according to claim 1, characterized in that, The clamping assembly includes a second clamping plate fixed to the bracket and a cylinder, wherein the telescopic end of the cylinder is fixed with a first clamping plate that cooperates with the second clamping plate.

7. A method for testing the tensile strength of a car seat belt, using the car seat belt tensile strength testing device as described in any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Under the action of the clamping component, the two ends of the safety belt to be tested are clamped and fixed. At the same time, under the action of the lifting and pulling component, the height of the counterweight is adjusted and the energy storage component is moved. Step 2: When the counterweight reaches the required height, the lifting and pulling assembly releases the counterweight and, under the action of the energy storage assembly, provides the counterweight with a thrust toward the test platform. Step 3: When the counterweight impacts the seat belt, the impact force that the seat belt can withstand can be tested; Step 4: If the seat belt breaks due to impact, the counterweight will act on the multi-stage buffer mechanism, which works in conjunction with the limiting mechanism to cushion the counterweight.

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