A safety testing device for in-vehicle child safety seats

Abstract

The application discloses a kind of safety testing devices for vehicle-mounted child safety seats, belong to child safety seat test technical field.It includes two fixed platforms, the U-shaped turnover frame rotatably connected to two fixed platforms, the test platform rotatably connected to the U-shaped turnover frame, and the weight dropper;First rotary drive unit is arranged on the fixed platform, and second rotary drive unit is arranged on the U-shaped turnover frame;First laser displacement sensor is suspended above the test platform, and second laser displacement sensor is arranged below the test platform.The safety testing device for vehicle-mounted child safety seats of the application solves the problems of low test efficiency, inaccurate measurement and unrealistic test scene simulation in the prior art, and realizes efficient, accurate and realistic performance testing of vehicle-mounted child safety seats.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of child safety seat testing, and particularly relates to a safety testing device for a vehicle-mounted child safety seat. BACKGROUND

[0002] With the continuous improvement of children's awareness of safe travel by vehicle, vehicle-mounted child safety seats have become a key device for ensuring the safety of children traveling. The performance thereof is directly related to the life safety of children in traffic accidents, and therefore, a strict and scientific testing process is a core link for ensuring product quality. At present, in the field of performance testing of child safety seats, there are many problems to be solved in the prior art.

[0003] In terms of operation of the testing device, the traditional manual lifting testing platform relies on manual repeated adjustment, and a large amount of time and effort is required for each step from the lifting platform to the installation of the child safety seat. The cumbersome operation process seriously restricts the testing efficiency, and it is difficult to meet the growing product testing demand. In the data measurement link, for the position offset measurement of the dummy before and after the heavy object falling test, the manual measurement method using a ruler has significant drawbacks. On the one hand, the staff needs to be close to the testing device, and in the heavy object falling test process which has potential danger, the personal safety is threatened. On the other hand, the manual measurement is greatly affected by subjective factors and operation methods, and measurement errors are inevitable, which greatly reduces the accuracy and reliability of the test results. In addition, the existing testing device has defects in the ability to simulate real use scenarios. The heavy object falling test position after the child safety seat is turned is single, and when the seat is adjusted, the heavy object falling position cannot be flexibly adjusted, which makes it difficult to fully simulate the real situation of the vehicle under different collision angles and speeds, so that the test results are disconnected with the actual use scenario, and cannot provide effective reference for product optimization. At the same time, in the horizontal turning test, the additional variables generated by the seat shaking interfere with the test data, and it is difficult to ensure the position consistency when turning vertically to 180°, which leads to the lack of stability and comparability of the test results, further weakening the effectiveness of the test. SUMMARY

[0004] The present application aims to overcome the deficiencies in the prior art, and provides a safety testing device for a vehicle-mounted child safety seat, to solve the problems of low testing efficiency, inaccurate measurement and unrealistic test scene simulation in the prior art, and to realize efficient, accurate and actual use scenario conforming performance testing of the vehicle-mounted child safety seat.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a safety testing device for a vehicle child safety seat, comprising two electrically connected fixed platforms that can be synchronously raised and lowered in a first direction, a U-shaped flip frame rotatably connected at both ends to the two fixed platforms, a test platform rotatably connected to the U-shaped flip frame and used for installing a child safety seat, and a weight dropper capable of vertically downward or tilted downward in the vertical direction to pull the seat belt on the child safety seat.

[0006] The fixed platform is provided with a first rotary drive unit for driving the U-shaped flip frame to rotate, and the U-shaped flip frame is provided with a second rotary drive unit for driving the test platform to rotate. The rotation axis of the U-shaped flip frame extends along a second direction perpendicular to the first direction and is perpendicular to the rotation axis of the test platform.

[0007] A first laser displacement sensor is suspended above the test platform and can move along a first horizontal plane perpendicular to the plane containing the first and second directions. A second laser displacement sensor is provided below the test platform and can move freely in a second horizontal plane parallel to the first horizontal plane. The test directions of the first laser displacement sensor and the second laser displacement sensor are parallel to the first direction.

[0008] Optionally, a laser emitter capable of moving up and down along a first direction is provided on the side of the test stage, and the test direction of the laser emitter is parallel to the second direction.

[0009] Optionally, the two fixed platforms are slidably connected to two fixed brackets along the first direction, and each fixed bracket is rotatably connected to a lead screw assembly along the first direction, with the nut on the lead screw assembly fixedly connected to the fixed platform.

[0010] Each of the two lead screw assemblies has a pulley on its outer periphery, and the pulleys on the two lead screws are connected by a belt drive, with one of the pulleys being driven to the output end of the third rotary drive unit.

[0011] Optionally, two reinforcing ribs are symmetrically arranged on one side of the U-shaped flip frame along its rotation axis, and a positioning block is provided on the fixed bracket that can move along the second direction to engage with the gap between the two reinforcing ribs. The positioning block is located at the output end of the fourth linear drive unit.

[0012] Optionally, the two fixed brackets are symmetrically arranged on the base, and the base is provided with a protective frame, the protective frame is provided with a lighting lamp and a camera, and the protective frame is provided with a dual-axis drive unit for driving the first laser displacement sensor to move.

[0013] The double-shaft driving unit comprises a first moving seat slidably connected to the top of the protective frame along a third direction perpendicular to the second direction, and a second moving seat slidably connected to the first moving seat along the second direction, the third direction being perpendicular to the first direction;

[0014] The frame is provided with a first linear driving unit for driving the first moving seat to reciprocate along the third direction, the first moving seat is provided with a second linear driving unit for driving the second moving seat to reciprocate along the second direction, and the first laser displacement sensor is mounted on the second moving seat.

[0015] Optionally, the top side of the base for mounting the fixed support is perpendicular to the first direction and parallel to the second horizontal plane;

[0016] The second laser displacement sensor is fixedly connected to the top end of the mounting support, the bottom of the mounting support is provided with a counterweight disc, and the bottom side of the counterweight disc can be attached to the top side of the base.

[0017] Optionally, the laser emitter is arranged at the output end of the fifth linear driving unit, and the fifth linear driving unit can drive the laser emitter to ascend and descend along the first direction.

[0018] Optionally, the weight dropper comprises a rack, a counterweight assembly slidably connected to the rack along the direction of gravity, a steel wire rope fixedly connected to the top of the counterweight assembly, and a third linear driving unit capable of lifting the counterweight assembly from bottom to top.

[0019] The steel wire rope can be wound around the outer periphery of a plurality of fixed pulleys in sequence and connected to the safety belt.

[0020] Optionally, the counterweight assembly comprises a counterweight seat and a plurality of counterweight blocks capable of being stacked in sequence, the counterweight seat is provided with a counterweight adjusting shaft capable of penetrating through a plurality of the counterweight blocks along the direction of gravity, and each of the counterweight blocks is movably provided with a load pin capable of being perpendicularly inserted and matched with the counterweight adjusting shaft.

[0021] Optionally, the base is provided with a multidirectional adjusting mechanism for adjusting the traction angle of the steel wire rope;

[0022] The multidirectional adjusting mechanism comprises a connecting shaft seat rotatably connected to the base, a plurality of guide rails arranged in a circular array and connected to the base with the connecting shaft seat as the array center, and a sliding seat capable of sliding along the radial direction of the connecting shaft seat and detachably connected to the guide rail.

[0023] Two of the plurality of fixed pulleys are respectively connected to the sliding seat and the connecting shaft seat, and the sliding seat can be fixedly connected to any position on the guide rail.

[0024] Compared with the prior art, the present application has the beneficial effects: through the vertical double-rotation shaft structure of the V-shaped turnover frame and the test platform which are synchronously lifted and lowered by the double-fixed platforms, the operator can conveniently install and debug, and at the same time, the multi-angle stress state of the child seat during vehicle collision can be simulated, covering the impact scenes of horizontal, vertical and combined angles. At the same time, the three-dimensionally distributed laser displacement sensor array (first laser displacement sensor, second laser displacement sensor, laser emitter) realizes multi-directional and high-precision measurement of seat deformation and dummy displacement, avoiding manual measurement errors and safety risks. In addition, the heavy weight dropper can drag the safety belt in the vertical or inclined direction, further simulating the tension change in the real collision, so that the test result is closer to the actual use scene. BRIEF DESCRIPTION OF DRAWINGS

[0025] The present application will be further described below in combination with the drawings and examples.

[0026] Figure 1 is a structural schematic view of a safety test device for a vehicle-mounted child safety seat in a preferred embodiment of the present application;

[0027] Figure 2 is a structural schematic view of a fixed platform, a V-shaped turnover frame, a test platform and a first rotation driving unit in a preferred embodiment of the present application;

[0028] Figure 3 is a structural schematic view of a mechanical transmission structure for driving two fixed platforms to synchronously lift and lower along the first direction in a preferred embodiment of the present application;

[0029] Figure 4 is a structural schematic view of a double-shaft driving unit in a preferred embodiment of the present application;

[0030] Figure 5 is a structural schematic view of a heavy weight dropper and a base in a preferred embodiment of the present application;

[0031] Figure 6 is a structural schematic view of a heavy weight dropper and a base in a preferred embodiment of the present application Figure 5 is a local enlarged structural schematic view at B;

[0032] Figure 7 is a sectional structural schematic view of the inside of a heavy weight dropper and a base in a preferred embodiment of the present application;

[0033] Wherein, 1, fixed platform; 2, V-shaped turnover frame; 201, reinforcing rib plate; 3, test platform; 4, first rotary drive unit; 5, second rotary drive unit; 6, first laser displacement sensor; 7, second laser displacement sensor; 8, laser emitter; 9, fixed support; 10, screw assembly; 11, pulley; 12, belt; 13, third rotary drive unit; 14, positioning block; 15, fourth linear drive unit; 16, base; 17, protective frame; 18, first transfer base; 19, second transfer base; 20, first linear drive unit; 21, second linear drive unit; 22, mounting bracket; 2201, counterweight disc; 23, fifth linear drive unit; 24, rack; 25, steel wire rope; 26, third linear drive unit; 27, fixed pulley; 28, counterweight base; 2801, counterweight adjusting shaft; 29, counterweight block; 30, load pin; 31, connecting shaft base; 32, guide rail; 33, sliding base; 34, illuminating lamp; 35, camera. DETAILED DESCRIPTION

[0034] The present application will now be described in further detail by way of illustration with reference to the accompanying drawings, in which:

[0035] It should be noted that if the embodiment has directionality indication (such as up, down, bottom, top, etc.), the directionality indication is only used to explain the relative position relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directionality indication also changes accordingly. The terms "first", "second" are only for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features with "first", "second" can explicitly or implicitly include one or more features. Unless otherwise specified and limited, the terms "set", "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] As Figures 1-7As shown, a kind of safety testing device for vehicle-mounted child safety seat, including two fixed platforms 1 electrically connected and can be synchronous lifting along the first direction, two ends are respectively rotationally connected on two fixed platforms 1 on the U-shaped turnover frame 2, rotationally connected on the U-shaped turnover frame 2 and for installing the test platform 3 of child safety seat, and the weight falling device capable of vertically downward or obliquely downward dragging safety belt on child safety seat along vertical direction.Specifically, two ends of the U-shaped turnover frame 2 are respectively rotationally connected on two fixed platforms 1, by the synchronous lifting of two fixed platforms 1, to drive test platform 3 to lift.The application of the structure not only can improve the efficiency of operator installation and debugging child safety seat, simultaneously, can also improve the posture stability of child safety seat along with test platform 3 synchronous lifting.Meanwhile, first rotary drive unit 4 for driving U-shaped turnover frame 2 rotation is provided on fixed platform 1, the rotary shaft of U-shaped turnover frame 2 rotationally connected on the two ends of two fixed platforms 1 is located in same straight line, and second rotary drive unit 5 for driving test platform 3 rotation is provided on U-shaped turnover frame 2, the rotary shaft of U-shaped turnover frame 2 extends along the second direction perpendicular to the first direction, and is perpendicular to the rotary shaft of test platform 3, to make that under the driving action of first rotary drive unit 4 and second rotary drive unit 5, child safety seat installed on test platform 3 can carry out multi-angle adjustment, to increase the flexibility of safety testing device.Meanwhile, in the present technical solution, the upper of test platform 3 is suspended with the first laser displacement sensor 6 capable of moving along the first horizontal plane perpendicular to the plane where the first direction and the second direction lie, and the lower of test platform 3 is provided with the second laser displacement sensor 7 capable of freely moving in the second horizontal plane parallel to the first horizontal plane, and the testing direction of first laser displacement sensor 6 and second laser displacement sensor 7 is parallel to the first direction.

[0037] Before actual test, the fixed platform 1 can be lowered to a certain height, so as to facilitate the operator to install the child safety seat on the test platform 3, reduce the labor intensity and the step of manually debugging the child safety seat. It should be noted that the specific structure of the test platform 3 in the technical scheme is determined according to the test requirement, the test platform 3 can simulate one-to-one with the vehicle seat, and the connection mode between the child safety seat and the test platform 3 includes but is not limited to the use of ISOFIX interface connection (rigid connection through seat steel hard joint and two fixed points of automobile seat), LATCH connection (three-point connection is formed by increasing the top hook on the basis of ISOFIX) and automobile safety belt connection, so as to increase the authenticity of the test data. After the above operation is completed, the dummy can be placed on the child safety seat, and a protection network is formed on the chest, shoulder, waist and hip of the dummy through the safety belt on the child safety seat. Then the fixed platform 1, the V-shaped turnover frame 2, the test platform 3, the child safety seat and the dummy can be synchronously raised to a certain height, the test platform 3 can also be rotated by a certain angle according to the test requirement, then the first laser displacement sensor 6 which can move in the first horizontal plane is used to measure the straight line distance between the first horizontal plane and the head of the dummy, and the straight line distance between the first horizontal plane and a certain fixed position on the child safety seat. The second laser displacement sensor 7 can measure the straight line distance between the second horizontal plane and the head of the dummy after the child safety seat is turned over by 180 degrees. That is, before the safety belt is pulled by the weight dropper, the position information of the head of the dummy after the child safety seat is turned over by 180 degrees can be confirmed through the data feedback by the second laser displacement sensor 7. Then the safety belt on the child safety seat is pulled by the weight dropper to simulate the situation of the safety belt when the dummy is impacted by the safety belt pulled by the weight. Then the position information of the head of the dummy at this time can be tested by the second laser displacement sensor 7, that is, by comparing the attitude change of the head of the dummy before and after the test relative to the child safety seat, the safety of the child safety seat can be confirmed. Compared with manual measurement of the attitude change of the dummy before and after the test, the first laser displacement sensor 6 and the second laser displacement sensor 7 can not only improve the test efficiency, but also effectively improve the accuracy of the data.

[0038] In the above, before the weight dropping test is performed, the first laser displacement sensor 6 which can move in the first horizontal plane measures the straight line distance between the first horizontal plane and the head of the dummy, and the straight line distance between the first horizontal plane and a certain fixed position on the child safety seat, so that the distance difference of the head of the dummy and a certain position on the child safety seat in the first direction can be determined. Similarly, the second laser displacement sensor 7 can measure this value after the weight dropping test is completed, so that the attitude change of the head of the dummy before and after the test can be determined.

[0039] Further, the side of the test platform 3 is provided with a laser emitter 8 capable of emitting laser along the first direction, and the test direction of the laser emitter 8 is parallel to the second direction. The laser emitted by the laser emitter 8 can irradiate the position of the head of the dummy, so that the operator manually measures the distance between the head of the dummy before and after the test and the fixed horizontal plane (a plane parallel to the first horizontal plane or the second horizontal plane, such as the top side of the base 16 for mounting the fixed support 9) by using a ruler or other measuring tools, thereby verifying the test data of the second laser displacement sensor 7 and improving the authenticity of the test data.

[0040] Further, as shown in Figure 3 , the two fixed platforms 1 are respectively connected to the two fixed supports 9 along the first direction, and specifically, the fixed platform 1 and the fixed support 9 can be connected by the linear guide rail 32, the guide optical axis assembly and the like in the prior art to ensure the accuracy of the vertical lifting of the fixed platform 1. As shown in Figure 3 , in the technical solution, the guide optical axis assembly is taken as an example, and the number of guide optical axes arranged on each fixed support 9 along the first direction is not less than two, the guide optical axes are arranged parallel to each other, and the central axis of the guide optical axis is parallel to the first direction. The two ends of the guide optical axis can be fixedly connected to the fixed support 9 by the fixing seat in the prior art to ensure the stability and positioning accuracy of the guide optical axis. At the same time, the outer periphery of the guide optical axis is sleeved and connected with the linear bearing matched therewith, and the linear bearing can be fixedly connected with the fixed platform 1 by the fastener such as a bolt. Each fixed support 9 is rotatably connected with a lead screw assembly 10 along the first direction, and the lead screw assembly 10 is in the prior art and mainly composed of a lead screw and a nut threadedly connected with the outer periphery of the lead screw. In the technical solution, the two ends of the lead screw can be connected to the fixed support 9 by the bearing fixing seat in the prior art to ensure the installation accuracy of the lead screw, and the nut on the lead screw assembly 10 is fixedly connected to the fixed platform 1. The fixed connection between the nut and the fixed platform 1 includes but is not limited to threaded connection, welding and the like. The outer periphery of the lead screw in the two lead screw assemblies 10 is provided with a pulley 11, the pulleys 11 on the two lead screws are drivingly connected by a belt 12, and one of the pulleys 11 is drivingly connected to the output end of the third rotary driving unit 13, so that when the first servo driving unit drives one of the pulleys 11 to rotate, the two lead screws rotatably connected to the two fixed supports 9 can rotate synchronously, and the two fixed platforms 1 can also ascend and descend synchronously along the first direction, thereby ensuring the stability of the V-shaped turnover frame 2, the test platform 3 and the child safety seat ascending and descending along the first direction.

[0041] Further, as shown in Figures 1-3As shown, two reinforcing rib plates 201 are symmetrically arranged on one side of the U-shaped turnover frame 2 along its rotation axis, and the fixed support 9 is provided with a positioning block 14 capable of being inserted into the gap between the two reinforcing rib plates 201 in the second direction, and the positioning block 14 is arranged on the output end of the fourth linear drive unit 15. That is, when the U-shaped turnover frame 2 and the child safety seat are turned over by 180 degrees, the fourth linear drive unit 15 can drive the positioning block 14 to move in the second direction, so that the positioning block 14 is inserted into the gap between the two reinforcing rib plates 201, thereby fixing the position of the U-shaped turnover frame 2, avoiding the position of the U-shaped turnover frame 2 from being deflected when the heavy weight descender pulls the safety belt, and improving the consistency of the test position of the U-shaped turnover frame.

[0042] Further, as shown in Figure 1 、 Figure 4 , the two fixed supports 9 are symmetrically arranged on the base 16, and the base 16 is provided with a protective frame 17, and the protective frame 17 is provided with a double-shaft drive unit for driving the first laser displacement sensor 6 to move. The double-shaft drive unit includes a first moving carrier 18 slidingly connected to the top of the protective frame 17 in a third direction perpendicular to the second direction, and a second moving carrier 19 slidingly connected to the first moving carrier 18 in the second direction, and the third direction is perpendicular to the first direction. Similarly, the connection between the frame and the first moving carrier 18, and the connection between the first moving carrier 18 and the second moving carrier 19 can adopt the connection mode between the fixed support 9 and the fixed carrier 1 described above, thereby ensuring the straight-line operation precision of the first moving carrier 18 and the second moving carrier 19.

[0043] Among them, the frame is provided with a first linear drive unit 20 for driving the first moving carrier 18 to move back and forth in the third direction, and the first moving carrier 18 is provided with a second linear drive unit 21 for driving the second moving carrier 19 to move back and forth in the second direction, and the first laser displacement sensor 6 is installed on the second moving carrier 19. Through the mutual cooperation between the first linear drive unit 20 and the second linear drive unit 21, the first laser displacement sensor 6 can be driven to move in the first horizontal plane formed by the second direction and the third direction. Thus, the position of the first laser displacement sensor 6 can be adjusted according to the position of the simulation dummy.

[0044] Further, as shown in Figure 1 、 Figure 4 、 Figure 5As shown, the top side of the base 16 for mounting the fixed support 9 is perpendicular to the first direction and parallel to the second horizontal plane. The second laser displacement sensor 7 is fixedly connected to the top end of the mounting bracket 22, and the bottom of the mounting bracket 22 is provided with a counterweight disc 2201, and the bottom side of the counterweight disc 2201 can be attached to the top side of the base 16. That is, the operator can adjust the test position of the second laser displacement sensor 7 relative to the dummy by moving the mounting bracket 22 on the top side of the base 16. And in this process, the operator only needs to pay attention to whether the mounting bracket 22 is standing on the top side of the base 16, so as to ensure that the second laser displacement sensor 7 can only be adjusted in the second horizontal plane parallel to the first horizontal plane, thereby ensuring the accuracy of the test data. It should be noted that in the present technical solution, a magnet capable of being magnetically attached to the top side of the base 16 can be embedded on the bottom side of the counterweight disc 2201, thereby increasing the stability of the mounting bracket 22 standing on the top side of the base 16.

[0045] Further, as shown in Figure 1 、 Figure 3 , the laser emitter 8 is arranged at the output end of the fifth linear drive unit 23, and the fifth linear drive unit 23 can drive the laser emitter 8 to move up and down along the first direction.

[0046] Further, as shown in Figure 5 、 Figure 6 , the weight dropper includes a rack 24, a counterweight assembly slidingly connected to the rack 24 in the direction of gravity, a steel wire rope 25 fixedly connected to the top of the counterweight assembly, and a third linear drive unit 26 capable of lifting the counterweight assembly from bottom to top.

[0047] The steel wire rope 25 can be wound around the outer periphery of a plurality of fixed pulleys 27 in sequence and connected to the safety belt. Specifically, in actual operation, the counterweight assembly can be first lifted by the third linear drive unit 26 to reach the limit height within the stroke range, and then the other end of the steel wire rope 25 can be connected to the safety belt of the upside-down placed child safety seat by using the connection methods in the prior art such as rope clamps, braiding, wedge sleeves, pressing, unloading, rings, rope buckles, and special clamps. Then the third linear drive unit 26 can move downward quickly so that the counterweight assembly can pull the safety belt through the steel wire rope 25 to meet the test requirements. It should be noted that in the present technical solution, the fixed pulleys 27 can be installed on the rack 24, the ground, or the base 16 by using fasteners such as bolts and expansion screws in the prior art, so that the direction of the steel wire rope 25 pulling the safety belt can be flexibly changed to simulate the situation of the weight dragging the safety belt under different conditions.

[0048] Further, as shown in Figure 5 、 Figure 6 、 Figure 7As shown, the counterweight assembly includes a counterweight base 28 and several counterweight blocks 29 that can be stacked sequentially. The counterweight base 28 is provided with a counterweight adjustment shaft 2801 along the direction of gravity, through which several counterweight blocks 29 can pass. Each counterweight block 29 can have a load pin 30 movably inserted, capable of perpendicularly engaging with the counterweight adjustment shaft 2801. That is, by operating the load pin 30, which is inserted into different positions of the counterweight blocks 29 and engages with corresponding positions on the counterweight adjustment shaft 2801, the load pin 30 fixes the relative position between the corresponding counterweight block 29 and the counterweight adjustment shaft 2801. Furthermore, the counterweight block 29 placed on top of the corresponding counterweight block 29 can also maintain a fixed position relative to the counterweight adjustment shaft 2801 under the support of that counterweight block 29. This allows the operator to flexibly adjust the effective traction force applied to the wire rope 25 by the counterweight assembly according to testing requirements.

[0049] Furthermore, such as Figure 6 As shown, a multi-directional adjustment mechanism for adjusting the traction angle of the wire rope 25 is provided on the base 16. The multi-directional adjustment mechanism includes a connecting shaft seat 31 rotatably connected to the base 16, and several guide rails 32 arranged in a circumferential array and connected to the base 16 with the connecting shaft seat 31 as the array center. The connecting shaft seat 31 can rotate about an axis parallel to a first direction, and the guide rails 32 are detachably connected to a slide block 33 that can slide radially along the connecting shaft seat 31. Two of the several fixed pulleys 27 are respectively connected to the slide block 33 and the connecting shaft seat 31, and the slide block 33 can be fixedly connected to any position on the guide rails 32. Specifically, as shown... Figure 6 As shown, the slide 33 and the guide rail 32 cooperate with each other, allowing the slide 33 to slide on the guide rail 32 and even detach from it. Furthermore, the slide 33 can be switched and slidably connected to another guide rail 32 under the operator's control, and can be fixed at any position on any guide rail 32, thereby flexibly adjusting the direction of the seat belt on the child safety seat. It should be noted that in this embodiment, the guide rail 32 and the slide 33 are connected in the following ways, including but not limited to, to meet the above-mentioned usage requirements: In this technical solution, the slide 33 includes a U-shaped plate and two clamping plates that are oppositely arranged and movably connected to the U-shaped plate. The two side plates on the U-shaped plate can form a "well" shaped structure with the two clamping plates. The guide rail 32 can be movably inserted through the middle of the "well" shaped structure. A bolt that can abut against one of the clamping plates is threaded on the U-shaped plate. When the bolt is turned, one end of the bolt can abut against the corresponding clamping plate and fit against the guide rail 32 until the guide rail 32 is firmly clamped between the two clamping plates, thereby fixing the relative position between the slide 33 and the guide rail 32.

[0050] In the embodiment, the first rotary drive unit 4, the second rotary drive unit 5, the third rotary drive unit 13, the first linear drive unit 20, the second linear drive unit 21, the third linear drive unit 26, the fourth linear drive unit 15, and the fifth linear drive unit 23 are all prior art. Specifically, the first rotary drive unit 4, the second rotary drive unit 5, and the third rotary drive unit 13 have the same structure and are all composed of a servo motor and a speed reducer, and the output end of the speed reducer can be drivingly connected to the U-shaped turnover frame 2 or the test platform 3 or the pulley 11 through a shaft coupling, a bearing seat, an electric slip ring, and other mechanical transmission components. The first linear drive unit 20, the second linear drive unit 21, the third linear drive unit 26, the fourth linear drive unit 15, and the fifth linear drive unit 23 have the same structure and are all composed of a servo motor, a lead screw, and a nut that can form a lead screw assembly 10. The lead screw can be connected to the corresponding components through a bearing seat in the prior art, and the nut can serve as an output end. The output shaft of the servo motor can be drivingly connected to the lead screw through a shaft coupling and other mechanical transmission components. It should be noted that in the technical solution, the first rotary drive unit 4, the second rotary drive unit 5, the third rotary drive unit 13, the first linear drive unit 20, the second linear drive unit 21, the third linear drive unit 26, the fourth linear drive unit 15, the fifth linear drive unit 23, the first laser displacement sensor 6, the second laser displacement sensor 7, and the laser emitter 8 can be electrically connected to achieve coordinated operation, thereby increasing the efficiency of the test device.

[0051] The first direction corresponds to the Z-axis direction (including the positive direction and the negative direction) in the spatial rectangular coordinate system, the second direction corresponds to the Y-axis direction (including the positive direction and the negative direction) in the spatial rectangular coordinate system, and the third direction corresponds to the X-axis direction (including the positive direction and the negative direction) in the spatial rectangular coordinate system. In the technical solution, the first direction corresponds to the vertical direction (i.e., the direction of gravity).

[0052] Further, in the technical solution, the protective frame 17 is provided with a lighting lamp 34 and a camera 35 to monitor and save the entire process of testing the child safety seat in real time and ensure a bright environment when monitoring and manually operating the device.

[0053] Working principle: through the synchronous lifting of double fixed platforms 1, the vertical double rotation axis structure of the V-shaped turnover frame 2 and the test platform 3 is matched, which is convenient for the operator to install and debug, and at the same time can simulate the multi-angle stress state of the child seat when the vehicle collides, covering the impact scene of horizontal, vertical and composite angle. At the same time, the three-dimensionally distributed laser displacement sensor array (first laser displacement sensor 6, second laser displacement sensor 7) realizes multi-directional and high-precision measurement of seat deformation and dummy displacement, avoiding manual measurement error and safety risk. In addition, the heavy weight downer can pull the safety belt along the vertical or inclined direction, further simulating the change of tension in the real collision, so that the test result is closer to the actual use scene.

[0054] The above is based on the ideal embodiment of the application, through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the application. The technical scope of the application is not limited to the content in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A safety testing device for a child safety seat in a vehicle, characterized by: The fixed platform (1) is provided with a first rotary drive unit (4) for driving the rotation of the U-shaped turnover frame (2), the U-shaped turnover frame (2) is provided with a second rotary drive unit (5) for driving the rotation of the test platform (3), and the rotation axis of the U-shaped turnover frame (2) extends along a second direction perpendicular to the first direction and is perpendicular to the rotation axis of the test platform (3); A first laser displacement sensor (6) is suspended above the test platform (3) and can move in a first horizontal plane perpendicular to the first direction and the second direction, and a second laser displacement sensor (7) is arranged below the test platform (3) and can move freely in a second horizontal plane parallel to the first horizontal plane, and the test directions of the first laser displacement sensor (6) and the second laser displacement sensor (7) are parallel to the first direction; Two fixed supports (9) are symmetrically arranged on the base (16), and the base (16) is provided with a protective frame (17), a lighting lamp (34) and a camera (35) are arranged on the protective frame (17), and a double-shaft drive unit is arranged on the protective frame (17) for driving the movement of the first laser displacement sensor (6); The double-shaft drive unit includes a first moving seat (18) slidingly connected to the top of the protective frame (17) along a third direction perpendicular to the second direction, and a second moving seat (19) slidingly connected to the first moving seat (18) along the second direction, and the third direction is perpendicular to the first direction; Wherein, the frame is provided with a first linear drive unit (20) for driving the first moving seat (18) to move back and forth along the third direction, the first moving seat (18) is provided with a second linear drive unit (21) for driving the second moving seat (19) to move back and forth along the second direction, and the first laser displacement sensor (6) is installed on the second moving seat (19). A laser emitter (8) is arranged beside the test platform (3) and can be lifted along the first direction, and the test direction of the laser emitter (8) is parallel to the second direction.

2. The safety testing device for a child safety seat of a vehicle according to claim 1, characterized by: Each of the fixed supports (9) is rotatably connected with a lead screw assembly (10) along the first direction, and a nut on the lead screw assembly (10) is fixedly connected to the fixed platform (1).

3. The safety testing device for in-vehicle child safety seats of claim 1, wherein: ​ Two of the screw rod assemblies (10) are provided with pulleys (11) on the outer periphery, the pulleys (11) of the two screw rods are drivingly connected by a belt (12), and one of the pulleys (11) is drivingly connected to the output end of a third rotary driving unit (13).

4. The safety testing device for in-vehicle child safety seats of claim 1, wherein: Two reinforcing rib plates (201) are symmetrically arranged on one side of the V-shaped turnover frame (2) along the rotation axis, and the fixing support (9) is provided with a positioning block (14) capable of being inserted and matched with the gap between the two reinforcing rib plates (201) in the second direction, and the positioning block (14) is arranged on the output end of a fourth linear driving unit (15).

5. The safety testing device for in-vehicle child safety seats of claim 1, wherein: The top side of the base (16) for mounting the fixing support (9) is perpendicular to the first direction and parallel to the second horizontal plane. The second laser displacement sensor (7) is fixedly connected to the top end of a mounting bracket (22), the bottom of the mounting bracket (22) is provided with a counterweight disc (2201), and the bottom side of the counterweight disc (2201) can be attached to the top side of the base (16).

6. The safety testing device for in-vehicle child safety seats of claim 2, wherein: The laser emitter (8) is arranged on the output end of a fifth linear driving unit (23), and the fifth linear driving unit (23) can drive the laser emitter (8) to ascend and descend in the first direction.

7. The safety testing device for in-vehicle child safety seats of claim 1, wherein: The weight dropper includes a rack (24), a counterweight assembly slidingly connected to the rack (24) in the direction of gravity, a steel wire rope (25) fixedly connected to the top of the counterweight assembly, and a third linear driving unit (26) capable of jacking up the counterweight assembly from bottom to top. The steel wire rope (25) can be wound around the outer periphery of a plurality of fixed pulleys (27) in sequence and connected to a safety belt.

8. The safety testing device for a child safety seat of a vehicle according to claim 7, characterized by: The counterweight assembly includes a counterweight seat (28) and a plurality of counterweight blocks (29) capable of being stacked in sequence, the counterweight seat (28) is provided with a counterweight adjusting shaft (2801) capable of penetrating a plurality of the counterweight blocks (29) in the direction of gravity, and each of the counterweight blocks (29) is movably provided with a load pin (30) capable of being vertically inserted and matched with the counterweight adjusting shaft (2801).

9. The safety testing device for a child safety seat of a vehicle according to claim 8, characterized by: A multidirectional adjusting mechanism is arranged on the base (16) for adjusting the traction angle of the steel wire rope (25). The multidirectional adjusting mechanism includes a connecting shaft seat (31) rotatably connected to the base (16), a plurality of guide rails (32) arranged in a circular array and connected to the base (16) with the connecting shaft seat (31) as the array center, and the guide rail (32) is detachably connected with a sliding seat (33) capable of sliding in the radial direction of the connecting shaft seat (31). Two of the plurality of fixed pulleys (27) are respectively connected to the sliding seat (33) and the connecting shaft seat (31), and the sliding seat (33) can be fixedly connected to any position on the guide rail (32).

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