A seat belt wear test device and a test method thereof

Abstract

The application provides a seat belt wear resistance testing device and a testing method thereof, and relates to the technical field of seat belt testing, which comprises a machine body, a friction assembly, a power assembly, a sensing assembly and a control part. The testing parameters are set through a display. During testing, one end of the seat belt is fitted to the exposed part of the deflection roller, the other end is connected to the fixing part at the bottom of the machine body, and the middle section of the seat belt is attached to the hexagonal rod. The control part drives the second driving part to drive the deflection roller to rotate within a set range, so that the seat belt repeatedly rubs on the hexagonal rod. When the number of single-side abrasions of the hexagonal rod reaches a set value, the control part drives the first driving part to drive the hexagonal rod to rotate to the un-abraded side. The control part is also electrically connected to the visual sensing part, the infrared sensing part and the flatness sensing part. The testing data is output by receiving the signals of the sensing parts, so that the problem that the test results are prone to deviation due to the large dependence of the hexagonal rod abrasion tester is solved.

Description

Technical Field

[0001] This invention relates to the field of seat belt testing technology, and more specifically, to a seat belt abrasion resistance testing device and testing method. Background Technology

[0002] Hexagonal bar wear simulates the friction between webbing and rigid components and is a crucial indicator for evaluating seatbelt wear performance. FMVSS 571.209 explicitly requires that automakers and auto parts suppliers include hexagonal bar wear in their seatbelt performance requirements. Currently, most hexagonal bar wear testing machines are manually operated. The flatness of the seatbelt during testing relies entirely on the operator's experience. If the surface is uneven, the webbing experiences uneven stress during testing, leading to deviations in seatbelt wear and significantly impacting test results, thus misleading assessments of seatbelt performance. Furthermore, during the development phase, confirming the surface quality of the webbing (such as fuzziness and curvature) requires stopping the machine and removing the seatbelt, increasing the difficulty of assessing hexagonal bar wear performance and wasting seatbelts. Additionally, existing testing machines can only set the number of test cycles, failing to accurately capture the actual number of wear cycles, hindering webbing development and quality control. In summary, current hexagonal bar wear testing suffers from high reliance on human intervention, leading to potentially biased results. Summary of the Invention

[0003] This invention discloses a seat belt abrasion resistance testing device, which aims to improve the problem that the existing hexagonal bar abrasion test is highly dependent on personnel, which makes the test results prone to deviation.

[0004] The present invention adopts the following solution:

[0005] A seatbelt abrasion resistance testing device includes a body, a friction assembly, a power assembly, a sensing assembly, and a control component. The friction assembly includes a hexagonal bar disposed on one side of the body and a first driving component for rotating the hexagonal bar. The power assembly includes a deflection roller and a second driving component for reciprocating the deflection roller, the deflection roller being at least partially exposed on the top of the body. The sensing assembly includes a bracket spaced apart from the body, a visual sensor for detecting the surface roughness of the seatbelt, an infrared sensor for detecting the surface waviness of the seatbelt, and a flatness sensor for laser aiming at the surface flatness of the seatbelt. The control unit is electrically connected to the first drive unit, the second drive unit, and each sensor, and the corresponding parameters are set via a display. During testing, one end of the safety belt is fitted to the exposed part of the deflection roller, and the other end is adapted and connected to the fixing part at the bottom of the machine body. The middle section of the safety belt is attached to the hexagonal bar. The second drive unit drives the deflection roller to rotate within a set range, so that the safety belt repeatedly rubs against the hexagonal bar. When the number of wear cycles on one side of the hexagonal bar reaches a set value, the first drive unit drives the hexagonal bar to rotate to the unworn side. The control unit receives signals from each sensor and outputs test data.

[0006] As a further improvement, the body includes an outer shell and a fixing frame. The top of the fixing frame is provided with multiple ribs at intervals, and each rib is provided with a through-hole for assembly. The hexagonal bar is accommodated in the assembly hole.

[0007] As a further improvement, the first driving member is located on the side of the fixed frame and includes a first motor, a driving wheel connected to the shaft of the first motor, and a driven wheel meshing with the driving wheel. The hexagonal bar passes through the central hole of the driven wheel.

[0008] As a further improvement, the second driving component includes a second motor, a drive wheel connected to the shaft of the second motor, and a connecting rod for connecting the deflection roller. The second motor is fixed in the machine body, the central axis of the deflection roller is adapted to the machine body, a first eccentric shaft is eccentrically arranged on the drive wheel, a second eccentric shaft is eccentrically arranged on the deflection roller, and the two ends of the connecting rod are respectively hinged to the first eccentric shaft and the second eccentric shaft.

[0009] As a further improvement, the deflection roller is provided with a clamp, which includes a pressure plate, a positioning plate, a bolt, and a spring. The positioning plate is fixed to the deflection roller, the pressure plate is disposed below the positioning plate, the bolt passes through the positioning plate and is connected to the pressure plate, the spring is sleeved on the bolt and abuts against the positioning plate, and the safety belt is installed between the positioning plate and the pressure plate. By pressing or releasing the bolt, the pressure plate can be loosened or clamped to secure the safety belt.

[0010] As a further improvement, a pressure sensor is provided on the pressure plate.

[0011] Another method for testing the seat belt abrasion resistance testing device as described above includes the following steps:

[0012] S1: Start the machine, operate the display, reset the test data to zero, set the upper limit of wear count d, segmentation accuracy k, surface waviness value λ, flatness reference f, and capture frequency of each sensor.

[0013] S2: Press the bolt to install the safety belt sample, release the bolt pressure plate to press the safety belt under the elastic force of the spring, and adjust the pressure values ​​at both ends of the pressure sensor to be consistent by rotating the bolts at both ends of the pressure plate;

[0014] S3: Start the flatness sensor to check the flatness of the seat belt. If the detected flatness value exceeds f, stop the machine.

[0015] S4: Start the test. The initial value of the number of tests c is 0. The drive wheel rotates once, c = c + 1, the coefficient n is an integer n ≥ 1, k is the segmentation precision, 1 < k < 100. When c = k * n and c < d, the infrared sensor records image T1 and the visual sensor records image T2.

[0016] S5: Within the set number of wear cycles d, if the infrared sensor detects that the surface waviness exceeds the set value, the machine will pause and output the wear cycle interval [k*(n-1), c], T1, T2; if it does not exceed the specified value, the operation will continue, and the data of each wear cycle interval [k*(n-1), c], T1, T2 will be recorded. When the wear cycle c reaches the set number of cycles d, the experiment will stop, the operator will remove the worn safety belt and record the data.

[0017] As a further improvement, step S1 includes S11: setting the wear angle, wear edge, and replacement frequency of the hexagonal bar via a display to drive the first driving member to rotate accordingly.

[0018] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0019] This application uses a control component to drive the first drive component to rotate to other unworn sides of the hexagonal bar when the wear count on one side reaches a set value, thereby ensuring the performance of the hexagonal bar during the testing process and guaranteeing test accuracy. Simultaneously, a sensing component is installed to detect the wear count, surface fuzziness, surface waviness, and flatness of the seatbelt during testing, avoiding errors from manual judgment, reducing the impact of human factors on the test, and improving test accuracy. Furthermore, data such as seatbelt curvature, flatness, fuzziness, and test cycle data can be retrieved via a display, thus avoiding seatbelt waste caused by stopping the machine to retrieve the seatbelt. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0021] Figures 1 to 4 This is a schematic diagram of the structure of one embodiment of the present invention with the outer shell hidden from different viewpoints;

[0022] Figure 5 This is a schematic diagram of the structure of a clamp according to one embodiment of the present invention;

[0023] Figure 6 and Figure 7 This is a schematic diagram of the overall structure of one embodiment of the present invention from different perspectives;

[0024] Figure 8 This is a control flowchart during testing of one embodiment of the present invention.

[0025] icon:

[0026] 1-Main body; 11-Fixed parts; 12-Outer shell; 13-Fixed frame; 131-Rib plate; 132-Protective box;

[0027] 21-Hexagonal bar; 22-Motor No. 1; 23-Driving wheel; 24-Driven wheel;

[0028] 31-Deflection roller; 311-Second eccentric shaft; 312-Central shaft; 32-Second motor; 33-Drive wheel; 331-First eccentric shaft; 34-Connecting rod;

[0029] 41-Bracket; 42-Vision sensor; 43-Infrared sensor; 44-Flatness sensor;

[0030] 51-Monitor;

[0031] 6-Clamp; 61-Pressure plate; 62-Positioning plate; 63-Bolt; 64-Spring. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example

[0034] Combination Figure 1 Figure 7 This embodiment provides a seat belt abrasion resistance testing device, including a body 1, a friction assembly, a power assembly, a sensing assembly, and a control component. The friction assembly includes a hexagonal bar 21 disposed on one side of the body 1 and a first driving component for driving the hexagonal bar 21 to rotate. The power assembly includes a deflection roller 31 and a second driving component for driving the deflection roller 31 to reciprocate; the deflection roller 31 is at least partially exposed on the top of the body 1. The sensing assembly includes a bracket 41 spaced apart from the body 1 and facing the side of the hexagonal bar 21, a visual sensor 42 for detecting the surface roughness of the seat belt, an infrared sensor 43 for detecting the surface waviness of the belt, and a laser-guided aiming device for the belt. The surface flatness is sensed by a flatness sensor 44; the control unit is electrically connected to the first drive unit, the second drive unit, and each sensor, and the corresponding parameters are set via a display 51; during testing, one end of the safety belt is fitted to the exposed part of the deflection roller 31, and the other end is adapted to the fixing part 11 at the bottom of the machine body 1, with the middle section of the safety belt attached to the hexagonal bar 21; the second drive unit drives the deflection roller 31 to rotate within a set range, so that the safety belt rubs repeatedly on the hexagonal bar 21, and when the number of wear cycles on one side of the hexagonal bar 21 reaches a set value, the first drive unit drives the hexagonal bar 21 to rotate to the unworn side; the control unit receives signals from each sensor and outputs test data.

[0035] In this embodiment, the first driving component is driven by a control unit to rotate to other unworn sides for testing when the wear count on one side of the hexagonal bar 21 reaches a set value. This ensures the performance of the hexagonal bar 21 during the testing process and guarantees test accuracy. Simultaneously, a sensing component is provided to detect the wear count, surface fuzziness, surface waviness, and flatness of the seatbelt during testing. This avoids errors from manual judgment, reduces the impact of human factors on the test, and improves test accuracy. Furthermore, the bending data, flatness data, fuzziness data, and test cycle data of the seatbelt can be retrieved via the display 51, thus avoiding seatbelt waste caused by stopping the machine to retrieve the seatbelt.

[0036] It should be noted that the visual sensor 42 includes a camera, which performs digital analysis by capturing images, thereby avoiding subjective bias caused by visually judging the fraying of the seatbelt. The infrared sensor 43 detects the waviness of the seatbelt surface using infrared sensing and can record the number of times the seatbelt is worn. The flatness sensor 44 uses laser aiming to detect whether there is tilting, unevenness, etc. on the surface of the seatbelt, and detects the flatness of the surface of the seatbelt during installation. The structures of the visual sensor 42, infrared sensor 43, and flatness sensor 44 are existing technologies and will not be described in detail here.

[0037] In a preferred embodiment, the body 1 includes a shell 12 and a mounting frame 13. The top of the mounting frame 13 is provided with multiple ribs 131 spaced apart, each rib 131 having a through-groove for mounting. A hexagonal rod 21 is housed within the mounting groove. The spaced ribs 131 reduce the frictional resistance of the hexagonal rod 21 during rotation. Specifically, a first driving component is located on the side of the mounting frame 13, including a primary motor 22, a driving wheel 23 connected to the shaft of the primary motor, and a driven wheel 24 meshing with the driving wheel 23. The hexagonal rod 21 passes through the central hole of the driven wheel 24. The primary motor 22 is fixedly connected to the mounting frame 13. The central hole of the driven wheel 24 is similar in shape to the cross-section of the hexagonal rod 21. A limiting shaft is provided on the other side of the driven wheel 24 opposite to the central hole, and this limiting shaft is connected to the protective box 132 via a bearing. When installing the hexagonal rod 21, simply insert it along the mounting slot and pass it through the center hole of the driven wheel 24. For disassembly, simply pull the hexagonal rod 21 out along the mounting slot; installation and disassembly are convenient. After the hexagonal rod 21 is installed, it is driven by motor 22 to its initial angle. After one side reaches a certain number of wear cycles, it rotates sequentially to the unworn side. Once all six sides have reached the required number of wear cycles, a reminder will appear to replace the hexagonal rod 21.

[0038] Based on the above embodiments, in an optional embodiment of the present invention, the second driving component includes a second motor 32, a driving wheel 33 connected to the shaft of the second motor, and a connecting rod 34 for connecting the deflection roller 31. The second motor 32 is fixed inside the machine body 1, the central shaft 312 of the deflection roller 31 is adapted to the machine body 1, a first eccentric shaft 331 is eccentrically arranged on the driving wheel 33, a second eccentric shaft 311 is eccentrically arranged on the deflection roller 31, and the two ends of the connecting rod 34 are respectively hinged to the first eccentric shaft 331 and the second eccentric shaft 311, so that when the driving wheel 33 rotates with the shaft of the second motor 32, it drives the deflection roller 31 to rotate back and forth within a certain range. Preferably, the exposed portion of the deflection roller 31 is provided with multiple clamps 6 at equal intervals. Each clamp 6 includes a pressure plate 61, a positioning plate 62, bolts 63, and springs 64. The positioning plate 62 is fixed to the deflection roller 31, the pressure plate 61 is positioned below the positioning plate 62, the bolts 63 pass through the positioning plate 62 and connect to the pressure plate 61, the springs 64 are sleeved on the bolts 63 and abut against the positioning plate 62, and a safety belt is installed between the positioning plate 62 and the pressure plate 61. By pressing or releasing the bolts 63, the pressure plate 61 can be loosened or clamped to secure the safety belt. Furthermore, a pressure sensor is provided on the pressure plate 61, and the pressure value of the pressure sensor can be adjusted by adjusting the bolts 63 at both ends of the pressure plate 61. This ensures the tension of the installation belt during the test and guarantees the accuracy of the test results.

[0039] Combination Figure 8 The present invention also provides a testing method for a seat belt abrasion resistance testing device, comprising the following steps:

[0040] S1: Start the machine, operate the display 51, reset the test data to zero, set the upper limit of wear count d, segmentation accuracy k, surface waviness value λ, flatness reference f, and capture frequency of each sensor.

[0041] S2: Press the bolt 63 to install the safety belt sample, release the bolt 63 and the pressure plate 61 presses the safety belt under the elastic force of the spring 64, and adjust the pressure values ​​at both ends of the pressure sensor to be consistent by rotating the bolts 63 at both ends of the pressure plate 61.

[0042] S3: Start the flatness sensor 44 to check the flatness of the seat belt. If the detected flatness value exceeds f, stop the machine.

[0043] S4: Start the test. The initial value of the number of tests c is 0. Drive wheel 33 rotates once, c = c + 1, coefficient n is an integer n ≥ 1, k is the segmentation precision, 1 < k < 100. When c = k * n and c < d, the infrared sensor records image T1 and the visual sensor 42 records image T2.

[0044] S5: Within the set number of wear cycles d, if the infrared sensor detects that the surface waviness exceeds the set value, the machine pauses and outputs the wear cycle interval [k*(n-1), c], T1, T2; if it does not exceed the specified value, the operation continues, recording the data [k*(n-1), c], T1, T2 for each wear cycle interval. When the wear cycle c reaches the set number of cycles d, the experiment stops, the operator removes the worn safety belt, and records the data. For example, d=30, k=5, when the test cycles c=5, 10, 15, 20, 25, 30, record T1 and T2.

[0045] Further, step S1 includes S11: setting the wear angle, wear edge, and replacement frequency of the hexagonal bar 21 via the display 51 to drive the first drive member to rotate accordingly, for example, rotating 60° each time a single side reaches the wear count.

[0046] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions that fall within the scope of the present invention are within the scope of protection of the present invention.

Claims

1. A test method for a seat belt abrasion resistance testing device, characterized in that, The seat belt abrasion resistance testing device includes: a body, friction components, a power component, a sensing component, and control components; The friction assembly includes a hexagonal bar disposed on one side of the body and a first driving member for driving the hexagonal bar to rotate; The power assembly includes a deflection roller and a second drive unit for driving the deflection roller to reciprocate, the deflection roller being at least partially exposed on the top of the machine body; The sensing components include a bracket spaced apart from the body, a visual sensor for detecting the surface roughness of the seat belt, an infrared sensor for detecting the surface waviness of the belt, and a flatness sensor for laser aiming at the flatness of the belt surface. The control unit is electrically connected to the first drive unit, the second drive unit, and each sensor unit, and the corresponding parameters are set through the display. During testing, one end of the safety belt is fitted to the exposed portion of the deflection roller, and the other end is adapted and connected to a fixing component at the bottom of the machine body. The middle section of the safety belt is attached to the hexagonal bar. The second driving component drives the deflection roller to rotate within a set range, so that the safety belt repeatedly rubs against the hexagonal bar. When the number of wear cycles on one side of the hexagonal bar reaches a set value, the first driving component drives the hexagonal bar to rotate to the unworn side. The control component receives signals from each sensor and outputs test data. The testing method includes the following steps: S1: Start the machine, operate the display, reset the test data to zero, set the upper limit of wear count d, segmentation accuracy k, surface waviness value λ, flatness reference f, and capture frequency of each sensor. S2: Press the bolt to install the safety belt sample, release the bolt pressure plate to press the safety belt under the elastic force of the spring, and adjust the pressure values ​​at both ends of the pressure sensor to be consistent by rotating the bolts at both ends of the pressure plate; S3: Start the flatness sensor to check the flatness of the seat belt. If the detected flatness value exceeds f, stop the machine. S4: Start the test, the initial value of the number of tests c is 0; when the drive wheel rotates once, c = c + 1, the coefficient n is an integer n≥1, k is the segmentation precision, 1<k<100, when When c < d, the infrared sensor records image T1, and the visual sensor records image T2. S5: Within the set upper limit value d for the number of wear cycles, if the infrared sensor detects that the surface waviness exceeds the set value, the machine will pause and output the wear cycle range. T1, T2; if the specified value is not exceeded, continue the operation and record the data for each wear count interval. Tests are conducted on T1 and T2, and the experiment is stopped when the number of tests c reaches the upper limit of the number of wear cycles d. The operator then removes the worn safety belt and records the data.

2. The test method of the seat belt abrasion resistance testing device according to claim 1, characterized in that, The body includes an outer shell and a fixing frame. The top of the fixing frame is provided with multiple ribs at intervals, and each rib is provided with a through-hole assembly groove. The hexagonal bar is accommodated in the assembly groove.

3. The test method of the seat belt abrasion resistance testing device according to claim 2, characterized in that, The first driving component is located on the side of the fixed frame and includes a first motor, a driving wheel connected to the shaft of the first motor, and a driven wheel meshing with the driving wheel. The hexagonal bar passes through the central hole of the driven wheel.

4. The test method of the seat belt abrasion resistance testing device according to claim 1, characterized in that, The second driving component includes a second motor, a drive wheel connected to the shaft of the second motor, and a connecting rod for connecting the deflection roller. The second motor is fixed in the machine body, the central axis of the deflection roller is adapted to the machine body, a first eccentric shaft is eccentrically arranged on the drive wheel, a second eccentric shaft is eccentrically arranged on the deflection roller, and the two ends of the connecting rod are respectively hinged to the first eccentric shaft and the second eccentric shaft.

5. The test method of the seat belt abrasion resistance testing device according to claim 4, characterized in that, The deflection roller is equipped with a clamp, which includes a pressure plate, a positioning plate, a bolt, and a spring. The positioning plate is fixed to the deflection roller, the pressure plate is positioned below the positioning plate, the bolt passes through the positioning plate and is connected to the pressure plate, the spring is sleeved on the bolt and abuts against the positioning plate, and the safety belt is installed between the positioning plate and the pressure plate. By pressing or releasing the bolt, the pressure plate can be loosened or clamped to secure the safety belt.

6. The test method of the seat belt abrasion resistance testing device according to claim 5, characterized in that, A pressure sensor is configured on the pressure plate.

7. The test method of the seat belt abrasion resistance testing device according to claim 1, characterized in that, Step S1 includes S11: setting the wear angle, wear edge, and replacement frequency of the hexagonal bar via a display to drive the first driving component to rotate accordingly.

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