Automobile safety belt tension testing device and testing method

Abstract

The invention relates to the technical field of safety belt testing, in particular to an automobile safety belt tension testing device and method, and the device comprises a test board, a support and a guide column, the support and the guide column are fixed on the test board, a top plate is fixed on the top of the support, and a clamping assembly is arranged on the support; the lifting traction assembly is arranged on the test board, is connected with the guide column and comprises a balancing weight; the energy storage assembly is arranged on the guide column, is connected with the lifting traction assembly and is used for providing thrust towards the direction of the test board for the balancing weight through the lifting traction assembly; according to the safety belt testing device, through cooperation of the multi-stage buffering mechanism and the limiting mechanism, when the safety belt is broken due to the impact of the balancing weight, the safety belt can be prevented from being damaged, so that the safety belt is prevented from being damaged, and the safety belt is prevented from being damaged. And the stress concentration generated by the impact of the balancing weight is dispersed.

Description

Technical Field

[0001] The present invention relates to the technical field of safety belt testing, in particular to a vehicle safety belt tension testing device and a testing method. Background Art

[0002] Car seat belts are one of the most important passive safety devices in a vehicle. They can effectively reduce the risk of occupant injury in the event of a collision or sudden braking. Therefore, the tension of the seat belts needs to be tested.

[0003] Seat belt tension 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 pulling force on the seat belt until it breaks. Dynamic tests usually involve providing an instantaneous impact force to the seat belt through simulation and observing whether the seat belt breaks.

[0004] Since seat belts are in effect under the instantaneous force generated by a car collision, dynamic impact is particularly important in seat belt testing. The existing dynamic impact is to pull a heavy object to a certain height and convert the gravitational potential energy into impact force on the seat belt. If the seat belt breaks due to impact, the weight will continue to move and impact the test bench, which may cause damage to the test bench due to the impact.

[0005] To this end, a spring can be set on the test bench to provide a certain buffering force to the heavy object through the spring to protect the test bench. However, when the heavy object acts on the spring, stress concentration will occur, and it is easy to cause uneven force on the spring, resulting in overload, which in turn leads to uneven distribution of contact pressure between the inner wall of the heavy object and the guide column, forming unilateral friction. Summary of the Invention

[0006] The object of the present invention is to provide a vehicle safety belt tension testing device and a testing method to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions: A vehicle safety belt tension testing device, comprising: A test bench, and a bracket and a guide column fixed to the test bench, a top plate fixed to the top of the bracket, and a clamping assembly provided on the bracket; Also includes: A lifting and pulling assembly is arranged on the test bench and connected to the guide column, and includes a counterweight block; an energy storage assembly, disposed on the guide column and connected to the lifting and pulling assembly, for providing a thrust to the counterweight block toward the test bench through the lifting and pulling assembly; A multi-stage buffer mechanism is arranged on a test bench. The test bench 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.

[0008] As a further solution of the present invention: the lifting and pulling assembly includes a reel rotatably mounted on the test bench, the axial sliding of the guide column has a movable plate fixedly connected to the counterweight block, a connecting roller is fixed on the movable plate, and a steel wire rope fixedly connected to the connecting roller is wound around the reel.

[0009] As a further solution of the present invention: the energy storage assembly includes a connecting plate fixed to the end of the guide column, a support sleeve is fixed to the connecting plate, a support rod slides axially in the support sleeve, a limiting wheel is fixed to the end of the support rod and cooperates with the movable plate, a first spring is sleeved on the support sleeve and the support rod, and the two ends of the first spring are respectively in contact with the connecting plate and the limiting wheel.

[0010] As a further solution of the present invention: the multi-stage buffer mechanism includes a limiting ring fixed on the guide column, the guide column is provided with a sliding sleeve for axial sliding, a support plate is fixed on the sliding sleeve, a second spring is sleeved on the guide column, and the two ends of the second spring are respectively in contact with the support plate and the limiting ring.

[0011] As a further solution of the present invention: the multi-stage buffer mechanism also includes a plurality of articulated sleeves hinged on the support plate and equidistantly distributed circumferentially, a receiving rod axially sliding in the articulated sleeve, the end of the receiving rod is hinged to a support wheel abutting against the guide column, and a third spring is sleeved on the articulated sleeve and the receiving rod.

[0012] As a further solution of the present invention: a limit block for limiting the swing angle of the articulated sleeve is fixed on the support plate.

[0013] As a further solution of the present invention: the limiting mechanism includes a fixed plate fixed on the test bench, a movable rod is slidably mounted on the fixed plate, and the end of the movable rod is fixed to the limiting plate.

[0014] As a further solution of the present invention: the limiting mechanism also 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, and the two ends of the fourth spring are respectively in contact with the fixed plate and the limiting plate.

[0015] As a further solution 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.

[0016] A method for testing the tension of a car safety belt comprises the following steps: Step 1: Under the action of the clamping assembly, clamp and fix the two ends of the safety belt to be tested. At the same time, under the action of the lifting and pulling assembly, adjust the height of the counterweight block and drive the energy storage assembly to move; 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 bench; Step 3: When the counterweight hits 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, and the multi-stage buffer mechanism cooperates with the limit mechanism to buffer the counterweight.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: the present application can provide sufficient impact force to the safety belt through the counterweight block through the dual cooperation of elastic potential energy and gravity release, and buffer and decompose the impact force of the counterweight block when the safety belt breaks, so as to ensure the safe use of the device. Specifically, under the action of the lifting and pulling assembly, the height of the counterweight block is lifted, and the lifting and pulling assembly also drives the energy storage assembly to move, thereby providing elastic potential energy to the counterweight block. When the counterweight block is lifted to the required height, through the dual action of gravity potential energy and elastic potential energy, the counterweight block reaches the required impact force and acts on the safety belt. If the safety belt breaks due to impact, the counterweight block will continue to move toward the test bench. The multi-stage buffer mechanism can disperse the impact force of the counterweight block 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 form, thereby ensuring that the impact force of the counterweight block is effectively dispersed, avoiding the problem of stress concentration during impact.

[0018] The greater the compression of the first spring, the greater the thrust that can be provided to the counterweight. Under the dual forces of gravitational potential energy and elastic potential energy, the impact force on the safety belt can be changed according to the lifting height of the counterweight, thereby freely adjusting the impact force to cope with the test force required for different safety belts and increase the scope of use of the device. When the lifting height of the counterweight is within a certain range, the change of elastic potential energy can ensure that the impact force provided by the counterweight meets the required requirements, thereby reducing the height and footprint of the entire device.

[0019] Through the cooperation of the second spring and the third spring, the impact force of the counterweight block can be decomposed into horizontal and vertical forces to prevent stress concentration problems during the impact process. When the support wheel responds to the impact and the angle between the articulated sleeve and the support plate continues to decrease, the vertical force can be controlled to be in a decreasing trend, thereby reducing the vertical load of the system and gradually increasing the horizontal force, so that the lateral constraint force of the support wheel on the guide column increases, thereby enhancing the stability of the guide column. Similarly, the friction between the support wheel and the guide column is increased, and the impact energy is further absorbed through friction energy consumption, which effectively suppresses the vertical displacement of the support wheel, thereby reducing the oscillation amplitude of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The figure is a structural diagram of an embodiment of a vehicle safety belt tension testing device.

[0021] Figure 2 This is a structural schematic diagram from another angle of an embodiment of a vehicle safety belt tension testing device.

[0022] Figure 3 for Figure 2 A magnified schematic diagram of the structure at point A.

[0023] Figure 4 This is a schematic structural diagram of the energy storage component, movable plate, and counterweight block in one embodiment of a vehicle seat belt tension testing device.

[0024] Figure 5 This is a schematic diagram of the explosion structure of the energy storage component in one embodiment of the automobile seat belt tension testing device.

[0025] Figure 6 This is a schematic structural diagram of a multi-stage buffer mechanism in one embodiment of a vehicle seat belt tension testing device.

[0026] Figure 7 This is a schematic diagram of the exploded structure of a multi-stage buffer mechanism in one embodiment of a vehicle seat belt tension testing device.

[0027] Figure 8 This is a structural schematic diagram of a limiting mechanism in an embodiment of a vehicle seat belt tension testing device.

[0028] Figure 9 This is a schematic diagram of the exploded structure of the limiting mechanism in one embodiment of a vehicle seat belt tension testing device.

[0029] Figure 10 This is a schematic structural diagram of a clamping assembly in one embodiment of a vehicle seat belt tension testing device.

[0030] In the figure: 1. test bench; 2. bracket; 3. top plate; 4. guide column; 401. limit ring; 5. connecting plate; 6. reel; 7. connecting roller; 8. wire rope; 9. movable plate; 10. counterweight; 11. support sleeve; 12. support rod; 13. limit wheel; 14. first spring; 15. cylinder; 16. first clamping plate; 17. second clamping plate; 18. sliding sleeve; 19. support plate; 20. second spring; 21. articulated sleeve; 2101. limit block; 22. receiving rod; 23. support wheel; 24. third spring; 25. fixed plate; 26. movable rod; 2601. movable ring; 27. limit plate; 28. fourth spring. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0033] See also Figures 1 to 10 In an embodiment of the present invention, a vehicle safety belt tension testing device includes: A test bench 1, and a bracket 2 and a guide column 4 fixed to the test bench 1, a top plate 3 fixed to the top of the bracket 2, and a clamping assembly provided on the bracket 2; Also includes: A lifting and pulling assembly is provided on the test bench 1 and connected to the guide column 4, and includes a counterweight block 10; an energy storage assembly, disposed on the guide column 4 and connected to the lifting and pulling assembly, for providing a thrust to the counterweight 10 toward the test bench 1 through the lifting and pulling assembly; The multi-stage buffer mechanism is arranged on the 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.

[0034] Specifically, when testing the seat belt, the test result can be achieved by impacting the counterweight 10. For this purpose, the two ends of the seat belt to be tested can be clamped and fixed by a clamping assembly, so that the seat belt is placed under the counterweight 10. At the same time, under the action of the lifting and pulling assembly, the height of the counterweight 10 is lifted, so that the gravitational potential energy of the counterweight 10 continues to increase. The lifting and pulling assembly will also drive the movement of the energy storage assembly. Under the action of the energy storage assembly, elastic potential energy is provided to the counterweight 10. When the counterweight 10 is lifted to the required height, the lifting and pulling assembly no longer provides traction to the counterweight 10. Under the action of gravity, the counterweight 10 performs free fall movement. At the same time, under the action of the energy storage assembly, a thrust is provided to the counterweight 10 toward the test bench 1, so that the initial speed of the counterweight 10 increases, thereby increasing the impact force of the counterweight 10 on the seat belt. When the counterweight 10 impacts the seat belt When the safety belt is in a state of shock, the maximum impact force borne by the safety belt can be recorded. If the safety belt breaks due to the impact, the counterweight 10 will continue to move toward the test bench 1 and act on the multi-stage buffer mechanism through the lifting and pulling assembly. The multi-stage buffer mechanism can disperse the impact force of the counterweight 10 into vertical and horizontal directions. The horizontal force impacts the guide column 4. Since the force is evenly distributed in the circumferential direction, a certain supporting force can be provided to the guide column 4 to ensure that the guide column 4 always remains stable. The vertical force is dispersed into multiple smaller forces in the form of sharing, thereby ensuring that the impact force of the counterweight 10 is effectively dispersed, avoiding the problem of stress concentration during impact. Under the action of the limiting mechanism, the multi-stage buffer mechanism can be limited when the impact force is too large to ensure that the multi-stage buffer mechanism does not continue to vibrate, resulting in problems affecting the safety belt test data.

[0035] See also Figure 1 、 Figure 2 、 Figure 10 The clamping assembly includes a second clamping plate 17 and a cylinder 15 fixed on the bracket 2, and the telescopic end of the cylinder 15 is fixed with a first clamping plate 16 that cooperates with the second clamping plate 17.

[0036] See also Figure 1 、 Figure 2 、 Figure 4 The lifting and pulling assembly includes a wire reel 6 rotatably mounted on the test bench 1, the guide column 4 has an axially sliding movable plate 9 fixedly connected to the counterweight block 10, a connecting roller 7 is fixed on the movable plate 9, and a steel wire rope 8 fixedly connected to the connecting roller 7 is wound around the wire reel 6.

[0037] See also Figure 1 、 Figure 2 、 Figure 4 、 Figure 5The energy storage assembly includes a connecting plate 5 fixed to the end of the guide column 4, a support sleeve 11 is fixed on the connecting plate 5, a support rod 12 is axially slid in the support sleeve 11, and a limiting wheel 13 is fixed to the end of the support rod 12, which is in contact with the movable plate 9. A first spring 14 is sleeved on the support sleeve 11 and the support rod 12, and the two ends of the first spring 14 are respectively in contact with the connecting plate 5 and the limiting wheel 13.

[0038] In detail, a mechanical sensor is installed on the first clamping plate 16, which can measure the force acting 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 a plurality of equally spaced wedge blocks. 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, under the action of the wedge blocks, the friction force on the seat belt is increased to ensure that the seat belt will not loosen when it is subjected to impact force.

[0039] A locking groove is formed on the inner wall of the support sleeve 11, and a locking block is fixed on the outer wall of the support rod 12 to slide and engage with the locking groove. Under the action of the locking groove and the locking block, the support rod 12 will not separate from the support sleeve 11. In the initial state, the movable plate 9 and the limiting wheel 13 are in a separated state, and the support rod 12 is located at the end of the stroke away from the support sleeve 11, so that the distance between the limiting wheel 13 and the connecting plate 5 is the largest, and the elongation of the first spring 14 in the natural state is greater than the maximum distance between the limiting wheel 13 and the connecting plate 5. In this regard, the first spring 14 is in a pre-compressed state, so that the limiting wheel 13 always has a thrust to move in the direction away from the connecting plate 5; When the safety belt needs to be tested, the reel 6 works and reels 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 continues to 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 limiting wheel 13, thereby driving the support rod 12 to move toward the support sleeve 11. The limiting wheel 13 will also compress the first spring 14, so that the elastic potential energy of the first spring 14 gradually increases; When the counterweight 10 is lifted to the required height, the reel 6 stops working. At this time, the counterweight 10 can be released. In the initial stage of release, the counterweight 10 will be subjected to the dual effects of gravity potential energy and elastic potential energy. Specifically, the first spring 14 is elastically released and pushes the limiting wheel 13 to move quickly in the direction away from the connecting plate 5. The limiting wheel 13 will also drive the support rod 12 to move in the direction away from the support sleeve 11. Under the action of the limiting wheel 13, the elastic potential energy stored in the first spring 14 is converted into a thrust on the movable plate 9, so that the initial speed of the counterweight 10 increases rapidly. When the movable plate 9 is separated from the limiting wheel 13, the counterweight 10 performs free fall movement, so that the impact force of the counterweight 10 itself gradually increases. When the counterweight 10 impacts the safety belt, under the action of the mechanical sensor, the magnitude of the impact force on the safety belt can be recorded, thereby effectively testing the safety belt.

[0040] Preferably, the greater the compression of the first spring 14, the greater the thrust that can be provided to the counterweight 10. In this regard, under the dual forces of gravitational potential energy and elastic potential energy, the impact force on the safety belt can be changed according to the lifting height of the counterweight 10, thereby freely adjusting the impact force to cope with the test force required for different safety belts and increase the scope of use of the device. 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 required requirements, thereby reducing the height and footprint of the entire device.

[0041] See also Figure 1-Figure 3 、 Figure 6 、 Figure 7 The multi-stage buffer mechanism includes a limit ring 401 fixed on the guide column 4, and the guide column 4 slides axially with a sliding sleeve 18, and a support plate 19 is fixed on the sliding sleeve 18. A second spring 20 is sleeved on the guide column 4, and the two ends of the second spring 20 are respectively abutted against the support plate 19 and the limit ring 401. The multi-stage buffer mechanism also includes a plurality of articulated sleeves 21 hinged on the support plate 19 and circumferentially equidistantly distributed, and a receiving rod 22 is axially slid in the articulated sleeve 21, and the end of the receiving rod 22 is hinged to a support wheel 23 abutting against the guide column 4, and a third spring 24 is sleeved on the articulated sleeve 21 and the receiving rod 22. A limit block 2101 for limiting the swing angle of the articulated sleeve 21 is fixed on the support plate 19.

[0042] See also Figure 1 、 Figure 2 、 Figure 8 、 Figure 9The limiting mechanism includes a fixed plate 25 fixed on the test bench 1, a movable rod 26 is slidably mounted on the fixed plate 25, and a limiting plate 27 is fixed to the end of the movable rod 26. The limiting mechanism also includes 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 are respectively in contact with the fixed plate 25 and the limiting plate 27.

[0043] The first spring 22 is in the state of being compressed, and the second spring 22 is in the state of being compressed, and the second spring 22 is in the state of being compressed. The limit plate 27 is arranged in a triangular inclined shape, and the inclined surface of the limit plate 27 and the support plate 19 can cooperate with each other, and the movable rod 26 extends out of the fixed plate 25 to the maximum length, so that the movable ring 2601 is in contact with the fixed plate 25, and the elongation of the fourth spring 28 in the natural state is greater than the maximum extension of the movable rod 26. In this regard, the fourth spring 28 is in a pre-compression state and always provides a thrust to the limit plate 27 in the direction away from the fixed plate 25. When the support wheel 23 is not subjected to a force, the support plate 19 and the limit plate 27 are in a separated state.

[0044] When the counterweight 10 impacts the safety belt, the impact force borne by the safety belt can be recorded by the mechanical sensor. If the safety belt is not broken due to the impact, since the safety belt is above the support wheel 23, the counterweight 10 will not contact the support wheel 23 under the obstruction of the safety belt. If the safety belt is broken due to the impact force, the counterweight 10 continues to move toward 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 toward the test bench 1. Since the hinged sleeve 21 has a certain inclination angle, the force acting on the support wheel 23 will be decomposed into two forces in the horizontal direction and the vertical direction. The horizontal impact force will be transmitted to the guide column 4. Since the four support wheels 23 are equidistantly distributed around the circumference, the forces acting on the guide column 4 will offset each other and be converted into supporting force on the guide column 4 to ensure that the guide column 4 always remains stable. At the same time, the vertical force will control the support wheel 23 to move toward the support plate 19, causing the receiving rod 22 to move toward the hinged sleeve 21, so that the third spring 24 is compressed. During this process, the angle between the hinged sleeve 21 and the support plate 19 continues to decrease, so that the vertical force borne by the hinged sleeve 21 continues to decrease, and the four hinged sleeves 21 can decompose the vertical force into four smaller forces, and act on the support plate 19, thereby compressing the second spring 20.

[0045] Preferably, by cooperating with the second spring 20 and the third spring 24, it is possible to decompose the impact force of the counterweight 10 into forces in the horizontal and vertical directions to prevent stress concentration during the impact process. Moreover, when the support wheel 23 responds to the impact and the angle between the hinge sleeve 21 and the support plate 19 continues to decrease, the vertical force is controlled to be in a decreasing trend, thereby reducing the vertical load of the system and gradually increasing the horizontal force, so that the lateral restraining force of the support wheel 23 on the guide column 4 is increased, thereby enhancing the stability of the guide column 4. Similarly, the friction between the support wheel 23 and the guide column 4 is increased, and the impact energy is further absorbed through friction energy consumption, thereby effectively suppressing the vertical displacement of the support wheel 23, thereby reducing the oscillation amplitude of the entire system. Among them, 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 column 4 when it is compressed, since the force has been decomposed onto the sliding sleeve 18, the second spring 20 will not directly act on the counterweight 10 when it is reset. Therefore, it will not cause the counterweight 10 to tilt, thereby avoiding the problem of unilateral friction between the counterweight 10 and the guide column 4.

[0046] 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. Due to the limited sampling rate of the mechanical sensor, if the system is in a continuous oscillation state, it may cause sampling failure of the mechanical sensor or cause phase delay problems. Therefore, it is necessary to suppress the oscillation. When the impact force of the counterweight 10 is small, the support wheel 23 itself has a certain inhibitory effect, so the oscillation amplitude is small and the time is short. When the impact force of the counterweight 10 is too large, the axial displacement of the support plate 19 on the guide column 4 increases. When the support plate 19 abuts the inclined surface of the limit plate 27, the limit plate 27 will give way and drive the movable rod 26 to move, so that the movable ring 2601 is separated from the fixed plate 25. At the same time, the limit plate 27 will also compress the fourth spring 28. When the support plate 19 is separated from the limit plate 27, the fourth spring 28 is elastically released, so that the limit plate 27 is reset. In this regard, when the support plate 19 displaces to the maximum value, the second spring 20 is elastically released, so that the support plate 19 is reset. During the reset process, the support plate 19 will abut against the horizontal surface of the limit plate 27. Under the action of the limit plate 27, the support plate 19 is limited, thereby suppressing the generation of oscillation.

[0047] A method for testing the tension of a car safety belt comprises the following steps: Step 1: Under the action of the clamping assembly, 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 assembly, the height of the counterweight block 10 is adjusted and the energy storage assembly is driven to move; 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 a thrust to the counterweight 10 toward the test bench 1; Step 3: When the counterweight 10 impacts the seat belt, the impact force that the seat belt can withstand can be tested; Step 4: If the safety belt breaks due to impact, the counterweight 10 will act on the multi-stage buffer mechanism, and the multi-stage buffer mechanism cooperates with the limiting mechanism to buffer the counterweight 10.

[0048] 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 embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0049] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A vehicle safety belt tension tester, comprising: A test bench, and a bracket and a guide column fixed on the test bench, a top plate being fixed on the top of the bracket, and a clamping assembly being provided on the bracket; it is characterized in that it also includes: a lifting and pulling assembly, which is arranged on the test bench and connected to the guide column, including a counterweight block; an energy storage assembly, which is arranged on the guide column and connected to the lifting and pulling assembly, and is used to provide the counterweight block with a thrust toward the test bench through the lifting and pulling assembly; a multi-stage buffer mechanism, which is arranged on the test bench, and a limiting mechanism connected to the multi-stage buffer mechanism is also provided on the test bench, and 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.

2. The vehicle safety belt tension testing device according to claim 1, characterized in that: The lifting and pulling assembly includes a wire reel rotatably mounted on the test bench, an axially sliding movable plate fixedly connected to the counterweight block, a connecting roller fixed on the movable plate, and a steel wire rope fixedly connected to the connecting roller wound on the wire reel.

3. The vehicle safety belt tension testing device according to claim 2, characterized in that: The energy storage assembly includes a connecting plate fixed to the end of the guide column, a support sleeve fixed to the connecting plate, a support rod axially sliding in the support sleeve, a limiting wheel fixed to the end of the support rod that abuts against the movable plate, a first spring is sleeved on the support sleeve and the support rod, and two ends of the first spring abut against the connecting plate and the limiting wheel respectively.

4. The vehicle safety belt tension testing device according to claim 1, characterized in that: The multi-stage buffer mechanism includes a limiting ring fixed on the guide column, a sliding sleeve is provided for axial sliding of the guide column, a support plate is fixed on the sliding sleeve, a second spring is sleeved on the guide column, and both ends of the second spring are respectively in contact with the support plate and the limiting ring.

5. The vehicle safety belt tension testing device according to claim 4, characterized in that: The multi-stage buffer mechanism also includes a plurality of articulated sleeves hinged on the support plate and distributed equidistantly around the circumference. A receiving rod slides axially in the articulated sleeve, and a support wheel is hinged at the end of the receiving rod to abut against the guide column. A third spring is sleeved on the articulated sleeve and the receiving rod.

6. The vehicle safety belt tension testing device according to claim 5, characterized in that: A limit block for limiting the swing angle of the articulated sleeve is fixed on the support plate.

7. The vehicle safety belt tension testing device according to claim 1, characterized in that: The limiting mechanism includes a fixed plate fixed on the test bench, a movable rod is slidably mounted on the fixed plate, and the end of the movable rod is fixed with the limiting plate.

8. The vehicle safety belt tension testing device according to claim 7, characterized in that: The limiting mechanism further 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 two ends of the fourth spring are respectively in contact with the fixed plate and the limiting plate.

9. The vehicle safety belt tension testing device according to claim 1, characterized in that: The clamping assembly includes a second clamping plate fixed on the bracket and a cylinder, and a first clamping plate matched with the second clamping plate is fixed to the telescopic end of the cylinder.

10. A method for testing the tension of an automobile safety belt, using the automobile safety belt tension testing device according to any one of claims 1 to 9, characterized in that: The invention comprises the following steps: Step 1: Under the action of the clamping assembly, the two ends of the seat belt to be tested are clamped and fixed. At the same time, under the action of the lifting and pulling assembly, the height of the counterweight block is adjusted, and the energy storage assembly is driven to move; Step 2: When the counterweight block reaches the required height, the lifting and pulling assembly releases the counterweight block, and under the action of the energy storage assembly, a thrust is provided to the counterweight block toward the test bench; Step 3: When the counterweight block impacts the seat belt, the impact force that the seat belt can withstand can be detected; Step 4: If the seat belt breaks due to the impact, the counterweight block will act on the multi-stage buffer mechanism, and the multi-stage buffer mechanism cooperates with the limit mechanism to buffer the counterweight block.

Images