Seat Belt Installation Module, Automobile Seat Belt Dynamic Test Device and Test Method

Abstract

The present invention provides a seat belt installation module, an automobile seat belt dynamic test device and a test method, which include a main support frame, two moving frames, two moving mounting columns and two seat belt installation modules; the seat belt installation module includes a mounting base, a pressing plate, a connecting seat structure and a fixed point mounting plate capable of connecting with the seat belt; the connecting seat structure includes a rotating seat and a connecting rod, one end of the connecting rod is connected to the rotating seat, the connecting rod penetrates through the pressing plate, and at least three arc-shaped long circular holes are provided on the rotating seat, and the center lines of the at least three arc-shaped long circular holes are located on the same circumference. The seat belt installation module, the automobile seat belt dynamic test device and the test method of the present invention solve the technical problem that the adjustment mechanism for adjusting the installation position of the seat belt end in the existing automobile seat belt dynamic test device is too complex, further increasing the test cost, and improve the measurement accuracy of the displacement of the dummy's chest part.

Description

Technical Field

[0001] The present invention belongs to the field of seat belt testing, and in particular relates to a seat belt installation module, an automotive seat belt dynamic test device and a test method. Background Art

[0002] An automotive seat belt restraint system is a safety device for restraining the occupant during a collision and avoiding secondary collisions between the occupant in the vehicle and the steering wheel, instrument panel, etc. during a collision or preventing the occupant from rushing out of the vehicle during a collision, resulting in death or injury. It is a type of automotive occupant restraint device. Currently, automotive seat belts are recognized worldwide as the cheapest and most effective safety devices and are mandatory equipment for motor vehicles in China. At present, the mandatory standard GB14166-2013 "Safety Belt Restraint System for Motor Vehicle Occupants" in China has clear requirements for the performance of seat belts, and the dynamic test is a key item in the test. It is required that after the dynamic performance test, the components of the seat belt assembly that affect occupant restraint shall not break and the buckle or locking system shall not fail; for the seat belt waistband, the forward displacement of the dummy's pelvic region is between 80 and 200 mm; for other types of automotive seat belts, the forward displacement of the dummy's pelvic position is between 80 and 200 mm, and the forward displacement of the chest position is between 100 and 300 mm; for the full-back type seat belt, the above minimum displacement can be reduced by half. For a seat belt with a pre-tensioning device, the minimum displacement can be reduced by half. For a seat belt installed on the outer side of the front row and equipped with an airbag seat, the movement of the dummy's chest can exceed 300 mm, but the speed when the reference point of the dummy's chest passes through this displacement shall not exceed 24 km / h.

[0003] Among them, the measurement of the dummy's chest displacement and the measurement of the speed are key parameters for evaluating the performance of the seat belt. Currently, there are mainly the following three methods for measuring the dummy's chest displacement: 1. Analyze the dummy's chest displacement and speed through high-speed photography. The main principle is to record the movement of the dummy and the trolley during the entire collision process through high-speed photography, and then the forward displacement and speed of the reference point of the dummy's chest during the collision can be obtained through image analysis and calculation; 2. Measure the dummy's chest displacement through a pull rope. The pull rope measurement method was the earliest measurement method applied to the dynamic displacement of seat belts and is also the most direct and convenient method. The pull rope measurement method directly fixes the measurement rope on the dummy's chest and buttocks, and adds a damping block with a damping effect behind the measurement rope to the seat. Through the damping effect of the damping block, the function of recording the dynamic measurement displacement is achieved; 3. Measure the dummy's chest displacement through a pull rope displacement sensor. The pull wire of the pull rope displacement sensor is fixed on the dummy's chest. The pull rope displacement sensor can output the relationship between time and the dummy's chest displacement. By simply calculating the displacement relative to time, the speed of the dummy's chest movement can be obtained, realizing the simultaneous monitoring of the dummy's chest displacement and speed.

[0004] However, there are inevitable measurement errors in these three measurement methods, which are mainly manifested in the following aspects: 1. For the high-speed camera measurement of the displacement of the dummy's chest, the human factors bring relatively large errors. During the measurement process, it is necessary to manually adjust the shooting angle of the high-speed camera, define the measurement reference point and the measurement reference point. At the same time, during the result analysis process, the capture of the measurement reference point is also affected by the high-speed camera image and lighting, resulting in great uncertainty. It cannot directly output the displacement of the dummy's chest, and the result analysis is complex. 2. For the drawstring measurement, the drawstring measurement can directly reflect the displacement of the dummy's chest through the movement of the damping block. However, only through the drawstring measurement, once the displacement of the dummy's chest exceeds 300mm, it is impossible to determine the speed of the dummy's chest at the 300mm point, and it is impossible to determine whether the test results meet the standard requirements. 3. For the wire rope displacement sensor measurement, the wire rope displacement sensor measurement can directly output the measured displacement and speed. However, in the high-speed collision external environment such as the dynamic test of the vehicle seat belt, due to its own design reasons, there are non-adjustable errors. Through a large number of tests, it is verified that the measurement results of the wire rope displacement sensor will be greater than the actual movement of the dummy's chest, which is preliminarily analyzed to be caused by the inertia of the wire rope reel.

[0005] The standard requirements for the dynamic test of seat belts stipulate that the installation points of seat belts should be installed by simulating the installation points of the actual vehicle seat belts or the national standard points specified in Appendix L of GB14166-2013 "Safety Belts, Restraint Systems, Child Restraint Systems and ISOFIX Child Restraint Systems for Motor Vehicle Occupants". The main installation and fixing positions include: the fixing point of the seat belt retractor, the fixing point of the buckle lock, the lower fixing point of the end piece, the fixing point of the height adjuster, etc. The installation positions of seat belts for different vehicle models and different types are not the same, mainly manifested as different installation point position coordinates and different installation angles. During the current test process, corresponding fixing tooling needs to be processed according to different seat belt installation forms for installation and fixing. Due to the overly complex adjustment mechanism of the fixing tooling in the existing technology for adjusting the installation angle of the seat belt end, the test cost increases and the test cycle increases. And because the adjustment mechanism of the dynamic test device of the vehicle seat belt in the existing technology for adjusting the installation position of the seat belt end is too complex, the test cost is further increased.

[0006] With the improvement of vehicle safety technology, especially the 2020 version of the China New Car Assessment Program (CNCAP) has clearly put forward higher requirements for the injury values of dummies. Installing a pretensioner and load limiter seat belt on vehicles has become a standard configuration. The pretensioning performance and load limiting performance of vehicle seat belts are particularly important. The key to assessing the pretensioning and load limiting performance in component tests lies in the measurement of dynamic displacement and speed. Especially for the calculation of speed in the case of excessive displacement, it is urgent to study new test methods and devices to improve test consistency and better verify the performance of seat belts. Summary of the Invention

[0007] In view of this, the present invention aims to provide a seat belt installation module, an automobile seat belt dynamic test device and a test method, which solve the technical problems that the adjustment mechanism for adjusting the installation angle of the seat belt end in the prior art is too complex, resulting in an increase in test costs and test cycle;

[0008] Furthermore, it solves the technical problem that the adjustment mechanism for adjusting the installation position of the seat belt end in the prior art of the automobile seat belt dynamic test device is too complex, further increasing the test cost, and improves the measurement accuracy of the displacement of the dummy's chest;

[0009] Furthermore, it solves the technical problems that in the prior art of the test method for the displacement and speed of the automobile seat belt dynamic test, the error is relatively large during the test process, and the result analysis is complex and it is impossible to determine whether the test result meets the standard requirements.

[0010] To achieve the above object, the technical solution of the present invention is realized as follows:

[0011] A seat belt installation module includes an installation base, a pressing plate, a connecting seat structure and a fixed point installation plate capable of connecting with the seat belt;

[0012] The connecting seat structure includes a rotating seat and a connecting rod. One end of the connecting rod is connected to the rotating seat. The connecting rod passes through the pressing plate. At least three arc-shaped long circular holes are provided on the rotating seat. The center lines of at least three arc-shaped long circular holes are located on the same circumference. A plurality of locking bolts sequentially pass through the installation base, the rotating seat and the pressing plate. One locking bolt is correspondingly arranged in each arc-shaped long circular hole. A nut capable of locking the installation base, the rotating seat and the pressing plate is provided on the locking bolt;

[0013] The connecting rod is detachably connected to the fixed point installation plate.

[0014] Furthermore, the rotating seat is a circular plate member, and the connecting rod is arranged at the axial center position of the rotating seat.

[0015] Furthermore, the number of the arc-shaped long circular holes is four, and the four arc-shaped long circular holes are arranged in a circumferential arrangement around the axis of the rotating seat.

[0016] Furthermore, a plurality of countersunk holes are provided on the installation base, and the number of the countersunk holes is the same as the number of the locking bolts. The countersunk head of each locking bolt is correspondingly arranged in one of the countersunk holes.

[0017] Furthermore, 7 rows of through holes are provided on the fixed point installation plate, and the 7 rows of through holes are evenly arranged on the fixed point installation plate. Each row of through holes includes 12 through holes.

[0018] A dynamic test device for vehicle seat belts, comprising a main support frame, two moving frames, two moving mounting columns and two of the above-mentioned seat belt mounting modules;

[0019] The two moving frames are arranged on the main support frame, and the two moving frames can slide along the Y direction. At least two first locking mechanisms for fixing the two moving frames are provided on the main support frame. At least two of the first locking mechanisms are symmetrically arranged left and right on the main support frame. One moving mounting column is correspondingly arranged on each moving frame. The moving mounting column can move along the X direction. Two second locking mechanisms for fixing the moving mounting column are provided on the moving frame. The two second locking mechanisms are symmetrically arranged up and down. One seat belt mounting module is correspondingly arranged on each moving mounting column. The seat belt mounting module can move along the Z direction. A third locking mechanism for fixing the seat belt mounting module is provided on the moving mounting column.

[0020] Further, the main support frame includes two first longitudinal beams, two second longitudinal beams and four support rods;

[0021] Each first longitudinal beam is connected to one second longitudinal beam through two support rods. The two support rods are symmetrically arranged at the front and rear ends of the first longitudinal beam. The two first longitudinal beams and the two second longitudinal beams are parallel to each other;

[0022] The number of the first locking mechanisms is four, and the four first locking mechanisms are respectively arranged on the two first longitudinal beams and the two second longitudinal beams.

[0023] Further, two T-shaped through grooves are provided in each of the two first longitudinal beams and the two second longitudinal beams. The two T-shaped through grooves in the same first longitudinal beam and second longitudinal beam are parallel to each other;

[0024] The first locking mechanism includes four racks, four pressing sliders, two C-shaped connecting plates and four locking bolts. Two pressing sliders and two racks are arranged in each T-shaped through groove. The pressing slider is provided with a tooth-shaped structure capable of meshing with the two racks at the same time. The pressing slider is slidably arranged in the T-shaped through groove. Two locking bolts are symmetrically arranged on each C-shaped connecting plate. Each locking bolt passes through one end of a C-shaped connecting plate and is threadedly connected to a pressing slider. The inner side of the C-shaped connecting plate of the first locking mechanism arranged on the first longitudinal beam is slidably connected to the first longitudinal beam. The inner side of the C-shaped connecting plate of the first locking mechanism arranged on the second longitudinal beam is slidably connected to the second longitudinal beam. The two C-shaped connecting plates of the first locking mechanism are respectively connected to one moving frame.

[0025] Further, the dynamic test device for vehicle seat belts further includes four sets of first guiding structures, and one first guiding structure is correspondingly arranged on each of the two first longitudinal beams and the two second longitudinal beams;

[0026] The first guiding structure includes a guide rail and two guiding sliders. The guide rail is arranged along the sliding direction of the moving frame. The guide rail of the first guiding structure arranged on the first longitudinal beam is connected to the first longitudinal beam. The two guiding sliders are slidably arranged on the guide rail. Each guiding slider is connected to a C-shaped connecting plate of a first locking mechanism located on the same first longitudinal beam. The guide rail of the first guiding structure arranged on the second longitudinal beam is connected to the second longitudinal beam. The two guiding sliders are slidably arranged on the guide rail. Each guiding slider is connected to a C-shaped connecting plate located on the same second longitudinal beam.

[0027] A testing method includes the following steps:

[0028] Step 1: Install one end of the seat belt on the fixed-point mounting plate of one of the seat belt mounting modules, and install the other end of the seat belt on the fixed-point mounting plate of the other seat belt mounting module. By adjusting the X, Y, and Z direction positions of the two seat belt mounting modules and rotating the rotation seat angles of the two seat belt mounting modules, make the coordinates of the seat belt mounting fixed points consistent with the test design point positions or the national standard point coordinates;

[0029] Step 2: Place the dummy at the middle position of the rigid seat, and let the feet naturally rest on the 45° footrest tooling;

[0030] Step 3: Arrange high-speed cameras on both sides of the sliding table. Adjust the shooting angle of the high-speed cameras so that they are vertically directed at the test platform, and adjust the high-speed camera images to clearly record the entire experimental process; Mark the reference points according to the displacement test requirements of the dummy's chest position, and record the distances of the reference points; Mark the measurement points on the dummy's chest;

[0031] Step 4: Arrange the pulling rope and the wire displacement sensor. Connect the pulling rope and the wire of the wire displacement sensor at the dummy's chest position at the same time, and pass the pulling rope through the damping block;

[0032] Step 5: Input the test parameter information into the trolley, and conduct the test through the trolley system;

[0033] Step 6: After the test, check the state of the seat belt and record the relevant data. Measure the displacement of the buttocks by the pulling rope method. If the seat belt breaks, or the buckle or the locking system releases or unlocks, it is directly judged as unqualified;

[0034] Step 7: Analysis of the displacement test results of the dummy's chest; Measure the moving distance of the drawstring damping block on the dummy's chest, which is the displacement S of the dummy's chest; If S is greater than or equal to 300 mm, it is necessary to calculate the speed of the dummy's chest at the moment of S = 300 mm through a wire displacement sensor; The calculation method is as follows: Output the time-displacement curve and time-velocity curve of the wire displacement sensor, and determine the time t1 at the moment when the displacement S1 = 300 mm of the wire displacement sensor is output through the displacement-time curve. Since there will be measurement errors in the wire displacement sensor itself, it is necessary to determine that the moment of S1 = 300 mm is the moment of S = 300 mm. The determination method is: Record the entire test process through high-speed photography, and check whether the drawstring of the wire displacement sensor has been in a taut state before the moment t1 through the recorded images of high-speed photography. If the drawstring has been in a taut state, then the moment t1 of S1 = 300 mm is the moment t of S = 300 mm, and the output speed of the wire displacement sensor corresponding to the moment t1 is the speed of the dummy's chest at the moment of S = 300 mm; If the drawstring of the wire displacement sensor has an obvious slack and bending state during the period of 0 - t1, then t1 ≠ t, and it is necessary to calculate the speed of the dummy's chest at the moment of S = 300 mm through the high-speed photography analysis method;

[0035] Further, the marking method of the measurement point on the dummy's chest in step 3 is as follows: The intersection point of the position where the dummy's arm is at the same height as the chest and the midline of the arm is the marking point. To prevent the influence of the dummy's clothes on the marking point, it is necessary to cut a hole in the clothes at the position of the dummy's marking point to realize pasting the marked BMW logo on the surface of the dummy's arm.

[0036] Compared with the prior art, the safety belt installation module, the dynamic test device and the test method of the vehicle safety belt of the present invention have the following advantages:

[0037] The safety belt installation module, the dynamic test device and the test method of the vehicle safety belt of the present invention can be applied to the dynamic tests of vehicle safety belts of all models, solve the disadvantages that the consistency of manually reading the displacement amount by the existing test bench and measuring device is poor, and the speed accuracy of high-speed camera software analysis is low and some situations cannot be measured. At the same time, the installation and adjustment are convenient by adopting an electric lead screw structure, which can meet the efficient installation of different vehicle models and different installation positions and angles of safety belts, solve the problem of poor versatility of the existing test bench, reduce the workload and increase the work efficiency. Description of the Drawings

[0038] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0039] Figure 1 It is a schematic diagram of a dynamic test device for a vehicle safety belt according to an embodiment of the present invention;

[0040] Figure 2 Schematic diagram of a dynamic test device for vehicle seat belts and a rigid seat structure according to an embodiment of the present invention;

[0041] Figure 3 Schematic diagram of a moving mounting column and a seat belt mounting module in a dynamic test device for vehicle seat belts according to an embodiment of the present invention;

[0042] Figure 4 Schematic diagram of a first locking mechanism in a dynamic test device for vehicle seat belts according to an embodiment of the present invention;

[0043] Figure 5 Schematic diagram of a pressing slider in a dynamic test device for vehicle seat belts according to an embodiment of the present invention;

[0044] Figure 6 Schematic diagram of a seat belt mounting module according to an embodiment of the present invention;

[0045] Figure 7 Schematic diagram of a combined structure of a mounting base, a connecting seat structure and a pressing plate in a seat belt mounting module according to an embodiment of the present invention;

[0046] Figure 8 Schematic diagram of a connecting seat structure in a seat belt mounting module according to an embodiment of the present invention;

[0047] Figure 9 Top view of a dynamic test device for vehicle seat belts according to an embodiment of the present invention;

[0048] Figure 10 Front view of a dynamic test device for vehicle seat belts according to an embodiment of the present invention;

[0049] Figure 11 Side view of a dynamic test device for vehicle seat belts according to an embodiment of the present invention;

[0050] Figure 12 Curve graph for calculating the displacement speed of a dummy's chest in a test method according to an embodiment of the present invention.

[0051] Explanation of reference numerals:

[0052] 101, fixed point mounting plate; 102, connecting seat structure; 103, pressing plate; 201, mounting base; 301, second longitudinal beam; 302, first longitudinal beam; 401, frame support rod; 402, frame cross beam; 403, moving mounting column; 404, C-shaped connecting plate; 501, rack; 502, pressing slider. Detailed implementation manners

[0053] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0054] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0055] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0056] The present invention will be described in detail below with reference to the drawings and in combination with embodiments.

[0057] A seat belt installation module, as Figure 6 shown, includes an installation base 201, a pressing plate 103, a connecting seat structure 102, and a fixed point installation plate 101 capable of connecting with the seat belt;

[0058] As Figure 8As shown in the figure, the connecting seat structure 102 includes a rotating seat and a connecting rod. One end of the connecting rod is connected to the rotating seat, and the connecting rod penetrates through the pressing plate 103. At least three arc-shaped long circular holes are provided on the rotating seat, and the center lines of at least three arc-shaped long circular holes are located on the same circumference. In this embodiment, the number of arc-shaped long circular holes is four, and the four arc-shaped long circular holes are arranged in a circular arrangement along the axis of the rotating seat. The rotating seat is provided with four arc-shaped long strip holes along a circle with a diameter of 150 mm. A plurality of locking bolts sequentially penetrate through the mounting base 201, the rotating seat, and the pressing plate 103. One locking bolt is correspondingly arranged in each arc-shaped long circular hole, and a nut capable of locking the mounting base 201, the rotating seat, and the pressing plate 103 is provided on the locking bolt. When the locking bolt is tightened, the mounting base 201, the rotating seat, and the pressing plate 103 can be locked; a plurality of counterbore holes are provided on the mounting base 201, and the number of counterbore holes is the same as the number of locking bolts. The counterbore of each locking bolt is correspondingly arranged in a counterbore hole.

[0059] The mounting base 201 is provided with circular through holes at 0°, 90°, 180°, and 270° along a circle with a diameter of 150 mm; the connecting rod is detachably connected to the fixed point mounting plate 101. In this embodiment, the rotating seat is a circular plate member, and the connecting rod is arranged at the axis position of the rotating seat.

[0060] The fixed point mounting plate 101 is provided with 7 rows of through holes, and the 7 rows of through holes are evenly arranged on the fixed point mounting plate 101. Each row of through holes includes 12 through holes. In this embodiment, the fixed point mounting plate 101 and the connecting rod are connected by six connecting bolts, and each connecting bolt passes through a through hole and is threadedly connected to the connecting rod.

[0061] An automobile seat belt dynamic test device, as Figure 1 shown, includes a main support frame, two moving frames, two moving mounting columns 403, and two of the above-mentioned seat belt mounting modules;

[0062] The two moving frames are arranged on the main support frame, and the two moving frames can slide along the Y direction. At least two first locking mechanisms capable of fixing the two moving frames are provided on the main support frame, and at least two first locking mechanisms are symmetrically arranged left and right on the main support frame. A moving mounting column 403 is correspondingly arranged on each moving frame, and the moving mounting column 403 can move along the X direction. Two second locking mechanisms capable of fixing the moving mounting column 403 are provided on the moving frame, and the two second locking mechanisms are symmetrically arranged up and down. A seat belt mounting module is correspondingly arranged on each moving mounting column 403, and the seat belt mounting module can move along the Z direction. A third locking mechanism capable of fixing the seat belt mounting module is provided on the moving mounting column 403.

[0063] The main support frame includes two first longitudinal beams 302, two second longitudinal beams 301 and four support rods; each first longitudinal beam 302 is connected to a second longitudinal beam 301 through two support rods, and the two support rods are symmetrically arranged at the front and rear ends of the first longitudinal beam 302. The two first longitudinal beams 302 and the two second longitudinal beams 301 are parallel to each other. The two support rods on one side of the first longitudinal beam 302 are vertically arranged, and the two support rods on the other side of the first longitudinal beam are inclined.

[0064] The number of the first locking mechanisms is four, and the four first locking mechanisms are respectively arranged on the two first longitudinal beams 302 and the two second longitudinal beams 301.

[0065] Two T-shaped through grooves are arranged in each of the two first longitudinal beams 302 and the two second longitudinal beams 301, and the two T-shaped through grooves in the same first longitudinal beam 302 and second longitudinal beam 301 are parallel to each other.

[0066] The first locking mechanism includes four racks 501, four pressing sliders 502, two C-shaped connecting plates 404 and four locking bolts. Two pressing sliders 502 and two racks 501 are arranged in each T-shaped through groove. The pressing slider 502 is provided with a tooth-shaped structure that can mesh with the two racks 501 at the same time. The pressing slider 502 is slidably arranged in the T-shaped through groove. Two locking bolts are symmetrically arranged on each C-shaped connecting plate 404. Each locking bolt passes through one end of a C-shaped connecting plate 404 and is threadedly connected to a pressing slider 502. The inner side of the C-shaped connecting plate 404 of the first locking mechanism arranged on the first longitudinal beam 302 is slidably connected to the first longitudinal beam 302, and the inner side of the C-shaped connecting plate 404 arranged on the second longitudinal beam 301 is slidably connected to the second longitudinal beam 301. The two C-shaped connecting plates 404 of the first locking mechanism are respectively connected to a moving frame. When the pressing slider 502 and the rack 501 are not pressed, they can move back and forth. After being pressed, the position is fixed and can bear a large impact force.

[0067] The vehicle seat belt dynamic test device further includes four sets of first guiding structures, and one first guiding structure is correspondingly arranged on each of the two first longitudinal beams 302 and the two second longitudinal beams 301; the first guiding structure includes a guide rail and two guiding sliders. The guide rail is arranged along the sliding direction of the moving frame. The guide rail of the first guiding structure arranged on the first longitudinal beam 302 is connected to the first longitudinal beam 302. The two guiding sliders are slidably arranged on the guide rail. Each guiding slider is connected to a C-shaped connecting plate 404 of the first locking mechanism arranged on the same first longitudinal beam 302. The guide rail of the first guiding structure arranged on the second longitudinal beam 301 is connected to the second longitudinal beam 301. The two guiding sliders are slidably arranged on the guide rail. Each guiding slider is connected to a C-shaped connecting plate 404 of the first locking mechanism arranged on the same second longitudinal beam 301.

[0068] The moving frame includes two frame crossbeams 402 and two frame support rods 401. One frame crossbeam 402 is connected to the other frame crossbeam 402 through two frame support rods 401. The two frame crossbeams 402 and the two frame support rods 401 form a rectangular structure. There are two second T-shaped through grooves in each frame crossbeam 402. Each frame crossbeam 402 is provided with a second guiding structure. The difference between the second guiding structure and the first guiding structure is that the number of guiding sliders is one. The guide rail of the second guiding structure is arranged on the frame crossbeam 402 along the moving direction of the moving mounting column. The guiding slider of the second guiding structure is connected to the moving mounting column 403. Each frame crossbeam 402 is provided with a second locking mechanism. The setting manner of the second locking mechanism on the frame crossbeam 402 is the same as the setting manner of the first locking mechanism on the first longitudinal beam 302. The difference between the second locking mechanism and the first locking mechanism is that the number of C-shaped connecting plates 404 of the second locking mechanism is one, and the C-shaped connecting plate 404 of the second locking mechanism is slidably arranged on the frame crossbeam 402.

[0069] There are two third T-shaped through grooves in the moving mounting column 403. The moving mounting column 403 is provided with a third guiding structure. The third guiding structure has the same structure as the second guiding structure. The guide rail of the third guiding structure is arranged on the moving mounting column 403 along the moving direction of the mounting base 201. The guiding slider of the third guiding structure is connected to the mounting base 201. The setting manner of the third locking mechanism on the moving mounting column 403 is the same as the setting manner of the first locking mechanism on the first longitudinal beam 302. The difference between the third locking mechanism and the first locking mechanism is that the number of C-shaped connecting plates 404 of the third locking mechanism is one, and auxiliary connecting plates capable of connecting with the mounting base 201 are provided at both the left and right ends of the C-shaped connecting plate 404. The C-shaped connecting plate of the third locking mechanism is slidably arranged on the moving mounting column 403.

[0070] The present invention provides a testing method combining high-speed photography, a pull rope, and a wire displacement sensor, which can avoid test errors and is simple to operate. The specific method is as follows:

[0071] Step 1: Install the seat belt according to the test design points or the national standard points specified in Appendix L of GB 14166-2013 "Seat Belts, Restraint Systems, Child Restraint Systems and ISOFIX Child Restraint Systems for Motor Vehicle Occupants", mainly including positions such as the retractor fixing point, buckle lock fixing point, lower fixing point, and height adjuster fixing point. By adjusting the X, Y, and Z direction positions of the two seat belt installation modules and rotating the rotation angles of the rotation seats of the two seat belt installation modules, the coordinates of the seat belt installation fixing points are made consistent with the test design point coordinates or the national standard point coordinates.

[0072] Step 2: Place the TNO-10 dummy in the middle position of a rigid seat that complies with the standard of GB 14166-2013 "Safety Belts, Restraint Systems, Child Restraint Systems and ISOFIX Child Restraint Systems for Motor Vehicle Occupants", and let the feet naturally rest on the 45° footrest tooling.

[0073] Step 3: Arrange high-speed cameras on both sides of the sled, adjust the shooting angle of the high-speed cameras so that they are perpendicular to the test platform, and adjust the high-speed camera images to clearly record the entire experimental process. Mark the reference points according to the test requirements of measuring the chest displacement of the dummy, and record the distances of the reference points. Mark the measuring points on the dummy's chest. The marking method of the dummy's chest measuring points is as follows: The intersection of the position where the dummy's arm is at the same height as the chest and the midline of the arm is the marking point. To prevent the dummy's clothes from affecting the marking point, it is necessary to cut holes in the clothes at the marking point of the dummy to enable the BMW logo sticker to be pasted on the surface of the dummy's arm.

[0074] Step 4: Arrange the pull rope and the wire displacement sensor. Connect the pull rope and the wire of the wire displacement sensor to the dummy's chest at the same time, and pass the pull rope through the damping block.

[0075] Step 5: Input parameter information such as the sensor sensitivity coefficient, ignition duration, and simulated waveform into the trolley, and conduct the test through the trolley system.

[0076] Step 6: Check the status of the safety belt and record relevant data after the test. Measure the displacement of the buttocks by the pull rope method. If the safety belt breaks, or the buckle or the locking system releases or unlocks, it is directly judged as unqualified.

[0077] Step 7: Analyze the test results of the dummy's chest displacement. Measure the moving distance of the pull rope damping block on the dummy's chest, which is the dummy's chest displacement S. If S is greater than or equal to 300 mm, it is necessary to calculate the speed of the dummy's chest at the moment of S = 300 mm through the wire displacement sensor. The calculation method is as follows: Output the time-displacement curve and time-velocity curve of the wire displacement sensor. Determine the time t1 at the moment when the output displacement S1 of the wire displacement sensor is 300 mm through the displacement-time curve. Since there will be measurement errors in the wire displacement sensor itself, it is necessary to determine that the moment of S1 = 300 mm is the moment of S = 300 mm. The determination method is: Record the entire test process through high-speed camera, and check whether the pull rope of the wire displacement sensor has been in a taut state before the moment t1 through the recorded images of the high-speed camera. If the pull rope has been in a taut state, then the moment t1 of S1 = 300 mm is the moment t of S = 300 mm, and the output speed of the wire displacement sensor corresponding to the moment t1 is the speed of the dummy's chest at the moment of S = 300 mm. If the pull rope of the wire displacement sensor shows obvious slack and bending states during the period of 0 - t1, then t1 ≠ t, and it is necessary to calculate the speed of the dummy's chest at the moment of S = 300 mm through the high-speed camera analysis method.

[0078] In this research, the test method measures the "chest displacement", a key value of the seat belt test dummy during the dynamic test, by using a reusable pull-back high-speed wire displacement sensor. After the test, a seat belt displacement-time curve can be output, as Figure 12 shown. By mathematical derivation, the accurate speed at a chest displacement of 300 mm can be obtained. The corresponding installation device of the displacement sensor is arranged at the middle position of the new seat belt dynamic test device. Through this device, universal installation in various forms (front row, rear row, complex angles, etc.) can be effectively realized, improving the test consistency. At the same time, the working intensity can be greatly reduced and the working efficiency can be improved.

[0079] The working mode of this example

[0080] 1. Perform the operation of step 1 in a measurement method, and control the point position error within 50 mm by three-coordinate measurement.

[0081] 2. Perform the operation of step 2 in a measurement method, arrange the test dummy, and place the displacement sensor.

[0082] 3. Perform the operation of step 3 in a measurement method, adjust the position and clarity of the high-speed camera, and input test parameters into the trolley control system.

[0083] 4. Conduct a seat belt dynamic test, and the high-speed camera records the whole process during the test.

[0084] 5. After the dynamic test is completed, according to a method for measuring the displacement and speed of an automotive seat belt during dynamic testing, check the seat belt status, calculate and record the seat belt dynamic test data, including the chest displacement, hip displacement of the dummy, and the chest speed of the dummy.

[0085] 6. Judge the test results and issue a test report.

[0086] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automobile seat belt dynamic test device, characterized in that: It includes a main support frame, two moving frames, two moving mounting columns (403) and two seat belt mounting modules; The two moving frames are arranged on the main support frame. The two moving frames can slide along the Y direction. At least two first locking mechanisms for fixing the two moving frames are provided on the main support frame. At least two of the first locking mechanisms are symmetrically arranged left and right on the main support frame. One of the moving mounting columns (403) is correspondingly arranged on each moving frame. The moving mounting column (403) can move along the X direction. Two second locking mechanisms for fixing the moving mounting column (403) are provided on the moving frame. The two second locking mechanisms are symmetrically arranged up and down. One of the seat belt mounting modules is correspondingly arranged on each moving mounting column (403). The seat belt mounting module can move along the Z direction. A third locking mechanism for fixing the seat belt mounting module is provided on the moving mounting column (403); The seat belt mounting module includes a mounting base (201), a pressing plate (103), a connecting seat structure (102) and a fixed point mounting plate (101) capable of connecting with a seat belt; The connecting seat structure (102) includes a rotating seat and a connecting rod. One end of the connecting rod is connected to the rotating seat. The connecting rod passes through the pressing plate (103). At least three arc-shaped long round holes are provided on the rotating seat. The center lines of at least three of the arc-shaped long round holes are located on the same circumference. A plurality of locking bolts sequentially pass through the mounting base (201), the rotating seat and the pressing plate (103). One of the locking bolts is correspondingly arranged in each arc-shaped long round hole. A nut for locking the mounting base (201), the rotating seat and the pressing plate (103) is provided on the locking bolt; The connecting rod is detachably connected to the fixed point mounting plate (101); The main support frame includes two first longitudinal beams (302), two second longitudinal beams (301) and four support rods; Two T-shaped through grooves are provided in both of the two first longitudinal beams (302) and the two second longitudinal beams (301). The two T-shaped through grooves in the same first longitudinal beam (302) and second longitudinal beam (301) are parallel to each other; The first locking mechanism includes four racks (501), four pressing sliders (502), two C-shaped connecting plates (404) and four locking bolts. Two pressing sliders (502) and two racks (501) are arranged in each of the T-shaped through grooves. The pressing slider (502) is provided with a tooth-shaped structure capable of meshing with the two racks (501) simultaneously. The pressing slider (502) is slidably arranged in the T-shaped through groove. Two of the locking bolts are symmetrically arranged on each of the C-shaped connecting plates (404). Each locking bolt passes through one end of a C-shaped connecting plate (404) and is threadedly connected to a pressing slider (502). The inner side of the C-shaped connecting plate (404) of the first locking mechanism arranged on the first longitudinal beam (302) is slidably connected to the first longitudinal beam (302). The inner side of the C-shaped connecting plate (404) arranged on the second longitudinal beam (301) is slidably connected to the second longitudinal beam (301). The two C-shaped connecting plates (404) of the first locking mechanism are respectively connected to a moving frame; The test method performed based on the above-mentioned vehicle seat belt dynamic test device includes the following steps: Step 1: Install one end of the seat belt on the fixed-point mounting plate (101) of a seat belt mounting module, and install the other end of the seat belt on the fixed-point mounting plate (101) of another seat belt mounting module. By adjusting the positions of the two seat belt mounting modules in the X, Y, and Z directions and rotating the rotation angles of the rotating seats of the two seat belt mounting modules, the coordinates of the seat belt mounting fixed points are made consistent with the test design point coordinates or the national standard point coordinates; Step 2: Place the dummy at the middle position of the rigid seat, and let the feet naturally rest on the 45° footrest tooling; Step 3: Arrange high-speed cameras on both sides of the sliding table. Adjust the shooting angle of the high-speed camera so that it shoots vertically towards the test platform, and adjust the high-speed camera image to clearly record the entire experimental process; Mark the reference points according to the measurement requirements of the dummy chest displacement by the high-speed camera, and record the distance of the reference points; Mark the measurement points on the dummy's chest; Step 4: Arrange the pull rope and the wire displacement sensor. Connect the pull rope and the wire of the wire displacement sensor at the chest position of the dummy, and pass the pull rope through the damping block; Step 5: Input the test parameter information into the trolley, and conduct the test through the trolley system; Step 6: After the test, check the state of the seat belt and record the relevant data. The hip displacement is measured by the pull rope method. If the seat belt breaks, or the buckle or the locking system releases or unlocks, it is directly judged as unqualified; Step 7: Analysis of the displacement test results of the dummy's chest; measure the moving distance of the drawstring damping block on the dummy's chest, which is the displacement S of the dummy's chest; if S is greater than or equal to 300 mm, it is necessary to calculate the speed of the dummy's chest at the moment when S = 300 mm through the wire displacement sensor; the calculation method is as follows: output the time-displacement curve and time-velocity curve of the wire displacement sensor, and determine the time t1 at the moment when the output displacement S1 of the wire displacement sensor is 300 mm through the displacement-time curve. Since there will be measurement errors in the wire displacement sensor itself, it is necessary to determine that the moment when S1 = 300 mm is the moment when S = 300 mm. The determination method is: record the entire test process through high-speed photography, and check whether the drawstring of the wire displacement sensor has been in a tightened state before the moment t1 through the recorded images of high-speed photography. If the drawstring has been in a tightened state, the moment t1 when S1 = 300 mm is the moment t when S = 300 mm, and the output speed of the wire displacement sensor corresponding to the moment t1 is the speed of the dummy's chest at the moment when S = 300 mm; if there is an obvious slack and bending state of the drawstring of the wire displacement sensor during the period from 0 to t1, then t1 ≠ t, and it is necessary to calculate the speed of the dummy's chest at the moment when the displacement S = 300 mm through the high-speed photography analysis method.

2. The dynamic test device for an automotive seat belt according to claim 1, characterized in that: For the circular plate of the rotating seat, the connecting rod is arranged at the axis position of the rotating seat.

3. The dynamic test device for an automotive seat belt according to claim 2, wherein: The number of the arc-shaped long circular holes is four, and the four arc-shaped long circular holes are arranged in a circumferential arrangement around the axis line of the rotating seat.

4. A dynamic test device for an automotive seat belt according to any one of claims 1-3, characterized in that: A plurality of countersunk holes are provided on the mounting base (201), the number of the countersunk holes is the same as the number of the locking bolts, and the countersunk head of each locking bolt is correspondingly arranged in one of the countersunk holes.

5. The dynamic test device for vehicle seat belts according to claim 4, characterized in that: Seven rows of through holes are provided on the fixed point mounting plate (101), and the seven rows of through holes are evenly arranged on the fixed point mounting plate (101), and each row of through holes includes 12 through holes.

6. The dynamic test device for an automotive seat belt according to claim 1, wherein: Each of the first longitudinal beams (302) is connected to a second longitudinal beam (301) through two support rods, and the two support rods are symmetrically arranged at the front and rear ends of the first longitudinal beam (302), and the two first longitudinal beams (302) and the two second longitudinal beams (301) are parallel to each other; The number of the first locking mechanisms is four, and the four first locking mechanisms are respectively arranged on the two first longitudinal beams (302) and the two second longitudinal beams (301).

7. An automotive seat belt dynamic test device according to claim 6, characterized in that: The dynamic test device for an automotive seat belt further includes four sets of first guiding structures, and one first guiding structure is correspondingly arranged on each of the two first longitudinal beams (302) and the two second longitudinal beams (301); The first guiding structure includes a guide rail and two guiding sliders. The guide rail is arranged along the sliding direction of the moving frame. The guide rail of the first guiding structure arranged on the first longitudinal beam (302) is connected to the first longitudinal beam (302). The two guiding sliders are slidably arranged on the guide rail. Each guiding slider is connected to one of the C-shaped connecting plates (404) of the first locking mechanism located on the same first longitudinal beam (302). The guide rail of the first guiding structure arranged on the second longitudinal beam (301) is connected to the second longitudinal beam (301). The two guiding sliders are slidably arranged on the guide rail. Each guiding slider is connected to one of the C-shaped connecting plates (404) located on the same second longitudinal beam (301).

8. The dynamic test device for an automotive seat belt according to claim 1, wherein: The method for marking the measuring points on the dummy's chest in step 3 is as follows: The intersection point of the position where the dummy's arm is at the same height as the chest and the midline of the arm is the marking point. To prevent the dummy's clothes from affecting the marking point, it is necessary to cut an opening in the clothes at the marking point of the dummy to enable pasting the BMW logo on the surface of the dummy's arm.

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