Acceleration calibration device for automobile safety belt tester

Abstract

The utility model relates to an acceleration calibration device for an automobile safety belt tester, which comprises a metal frame, a pulley and a pulley I are arranged on an upper-layer test bed of the metal frame, a rotatable support is mounted on the pulley, a retractor is mounted on the support, and a motor, a cam, a pulley II and a safety belt fixing device are mounted on a lower-layer test bed of the metal frame. The cam is driven by a motor, a follow-up mechanism of the cam is connected with a pulley installed on the guide rail through a steel cable, a safety belt is fixedly connected to the safety belt fixing device and sequentially wound around a second pulley, a first pulley and a retractor, and two reflective stickers are pasted to the safety belt. An infrared time measuring device and a photogrammetric camera are arranged right opposite to the reflective sticker, are respectively used for measuring time and displacement, and are respectively connected with the control system through lines; according to the utility model, the acceleration calibration of the automobile safety belt tester is more efficient and convenient, so that the automobile safety can be better guaranteed, and the life safety of passengers is protected.

Description

[Technical field]

[0001] The utility model relates to the technical field of automobile safety belt testing, in particular to an acceleration calibration device for an automobile safety belt tester. [Background Technology]

[0002] The car seat belt tester is a set of professional instruments for testing the strength and performance of car seat belts. It is widely used in automobile OEMs, automobile suppliers and automobile testing industries. Acceleration is one of the most critical indicators of the car seat belt tester.

[0003] At present, the acceleration calibration of automobile seat belt testers mainly adopts direct calibration method and indirect calibration method. Although the direct calibration method has higher calibration accuracy, it requires expensive equipment and professional operators, has high cost and low accessibility; although the indirect calibration method has lower cost and simpler operation, its accuracy is affected by many factors, and the uncertainty of the calibration result is large. [Contents of the utility model]

[0004] The purpose of the utility model is to solve the above-mentioned deficiencies and provide an acceleration calibration device for a car seat belt tester, which can not only save costs but also lower the threshold for operators, making the acceleration calibration of the car seat belt tester more efficient and convenient, thereby better ensuring car safety and protecting the lives of passengers.

[0005] In order to achieve the above-mentioned purpose, an acceleration calibration device for a car seat belt tester is designed, comprising a metal frame 1, a pulley 2 and a pulley 3 are arranged on the upper test bench of the metal frame 1, a rotatable bracket 4 is mounted on the pulley 2, a retractor 5 is mounted on the bracket 4, a driving mechanism, a pulley 2 8 and a seat belt fixing device 9 are mounted on the lower test bench of the metal frame 1, the driving mechanism is connected to the pulley 2 mounted on the guide rail, a seat belt is fixedly connected to the seat belt fixing device 9, and the seat belt passes around the pulley 2 8, the pulley 3 and the retractor 5 in sequence, The safety belt between pulley 2 8 and pulley 1 3 is arranged vertically, and two reflective stickers 10 are pasted on the vertically arranged safety belt at intervals. A measuring device 11 is arranged opposite to the reflective stickers 10, and the measuring device 11 includes an infrared time measuring device 12 and a photogrammetric camera 13. The infrared time measuring device 12 is used to measure the time for infrared rays to pass through the two reflective stickers 10, and the photogrammetric camera 13 is used to measure the displacements corresponding to the two reflective stickers 10. The infrared time measuring device 12 and the photogrammetric camera 13 are respectively connected to the control system through lines.

[0006] Furthermore, the driving mechanism includes a motor 6 and a cam 7. The cam 7 is installed at the output end of the motor 6 and driven by the motor 6. The follower mechanism of the cam 7 is connected to the pulley 2 installed on the guide rail by a steel cable.

[0007] Furthermore, the control system includes a main body 15 and a display screen 16 arranged on one side of the main body 15, the display screen 16 is used to display data and perform touch operations, and the other side of the main body 15 is provided with an indicator light 17, a switch 18, a voice prompter 19, a controller 20 and a storage 21, the voice prompter 19 is used to listen to voice and receive conversations, and the storage 21 is used to store data.

[0008] Furthermore, an acceleration sensor and a tension sensor are provided. The acceleration sensor is used to measure the acceleration borne by the safety belt in real time, and the tension sensor is used to measure the tension borne by the safety belt in real time. The acceleration sensor and the tension sensor are connected to the control system through lines respectively.

[0009] Furthermore, the infrared time measuring device 12 includes an infrared transmitter and receiver, an optical path system and an electronic timing circuit. The infrared transmitter and receiver are electrically connected to the optical path system and the electronic timing circuit respectively, so that the measurement speed is fast and the accuracy is high, making the measurement more accurate.

[0010] Furthermore, the entire area in front of the infrared time measuring device 12 and the crossbar between the two reflective stickers 10 is painted with black paint or pasted with black tape to prevent stray light from being scanned by infrared rays.

[0011] Furthermore, the retractor 5 is used to manage and adjust the length of the seat belt. A lock 14 is arranged inside the retractor 5. The lock 14 is a centrifugal lock. When the pulley 2 suddenly decelerates or collides, the retractor 5 quickly locks the seat belt to prevent the seat belt from being pulled out further.

[0012] Furthermore, the width of the reflective tape 10 is 2 mm, and the photogrammetric camera 13 measures the length between the center lines of two reflective tapes 10 when measuring the distance.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] (1) The utility model uses an infrared time measuring device to measure time, which has a fast measuring speed and high accuracy. Since infrared rays are invisible to the human eye, they will not interfere with the experimental operator. At the same time, in certain environments (such as smoke or dust), the penetration ability of infrared rays is stronger than that of visible light.

[0015] (2) The utility model has a high-precision measurement function by using a photogrammetric camera to measure distance, and can accurately measure the target object at the millimeter level;

[0016] (3) The utility model reduces the interference of stray light in the environment on infrared scanning by coating or sticking the entire crossbar of the automobile seat belt tester with black paint or black tape, thereby improving the accuracy of infrared scanning;

[0017] (4) The cam of the utility model is driven by a motor. The corresponding acceleration can be obtained through the combination of the cam design and the motor speed. The seat belt fixing device is used to simulate the installation method of the seat belt in the car to ensure that the test conditions are consistent with the actual use conditions;

[0018] (5) The utility model makes the acceleration calibration of the automobile seat belt tester more efficient and convenient, thereby better ensuring automobile safety and protecting the lives of passengers;

[0019] (6) The utility model can not only save costs but also lower the threshold for operators, and is worthy of popularization and application. [Drawings]

[0020] Figure 1 It is a structural schematic diagram of the utility model;

[0021] Figure 2 This is a schematic diagram of the utility model automobile safety belt tester with the crossbar painted black in front;

[0022] Figure 3 It is a structural schematic diagram of the control system of the utility model;

[0023] Figure 4 It is a side structural schematic diagram of the measuring device of the utility model;

[0024] In the figure: 1, metal frame 2, pulley 3, pulley 1 4, bracket 5, retractor 6, motor 7, cam 8, pulley 2 9, seat belt fixing device 10, reflective tape 11, measuring device 12, infrared time measuring device 13, photogrammetric camera 14, lock 15, main body 16, display screen 17, indicator light 18, switch 19, voice prompter 20, controller 21, storage 22, black paint or black tape. [Specific implementation method]

[0025] The utility model is further described below in conjunction with the accompanying drawings:

[0026] As attached Figure 1 To Attachment Figure 4As shown, the utility model provides an acceleration calibration device for a car seat belt tester, comprising a metal frame 1, a pulley 2 and a pulley 3 are arranged on the upper test bench of the metal frame 1, a rotatable bracket 4 is mounted on the pulley 2, a retractor 5 is mounted on the bracket 4, a driving mechanism, a pulley 2 8 and a seat belt fixing device 9 are mounted on the lower test bench of the metal frame 1, the driving mechanism is connected to the pulley 2 mounted on the guide rail, a seat belt is fixedly connected to the seat belt fixing device 9, the seat belt passes around the pulley 2 8, the pulley 3 and the retractor 5 in sequence, and the pulley 2 is connected to the guide rail, and the seat belt is fixedly connected to the seat belt fixing device 9, and the seat belt passes around the pulley 2 8, the pulley 3 and the retractor 5 in sequence, and the pulley 2 is connected to the guide rail ... pulley 2 is connected to the guide rail, and the retractor 5 is connected to the pulley 2. The safety belt between the second wheel 8 and the pulley 1 3 is arranged vertically, and two reflective stickers 10 are pasted on the vertically arranged safety belt. A measuring device 11 is arranged opposite to the reflective stickers 10. The measuring device 11 includes an infrared time measuring device 12 and a photogrammetric camera 13. The infrared time measuring device 12 is used to measure the time for infrared rays to pass through the two reflective stickers 10, and the photogrammetric camera 13 is used to measure the displacements corresponding to the two reflective stickers 10. The infrared time measuring device 12 and the photogrammetric camera 13 are connected to the control system through lines respectively.

[0027] The driving mechanism includes a motor 6 and a cam 7. The cam 7 is installed at the output end of the motor 6 and is driven by the motor 6. The follower mechanism of the cam 7 is connected to the pulley 2 installed on the guide rail by a steel cable. An acceleration sensor and a tension sensor are also provided. The acceleration sensor is used to measure the acceleration borne by the seat belt in real time. The tension sensor is used to measure the tension borne by the seat belt in real time. The acceleration sensor and the tension sensor are connected to the control system through lines respectively. The control system includes a main body 15 and a display screen 16 arranged on one side of the main body 15. The display screen 16 is used to display data and perform touch operations. An indicator light 17, a switch 18, a voice prompter 19, a controller 20 and a storage 21 are arranged on the other side of the main body 15. The voice prompter 19 is used to listen to voice and receive conversations, and the storage 21 is used to store data.

[0028] The infrared time measuring device 12 uses infrared as a detection medium and uses infrared to measure time intervals. The infrared time measuring device 12 includes an infrared transmitter and receiver, an optical path system and an electronic timing circuit, so that the measurement speed is fast and the accuracy is high, making the measurement more accurate; the infrared time measuring device 12 and the crossbar between the two reflective stickers 10 are entirely painted with black paint or pasted with black tape to prevent the infrared from scanning stray light; the photogrammetry camera 13 captures the image of the reflective sticker 10 on the seat belt, calculates the pixel distance between the two reflective stickers, and then converts it into the actual distance.

[0029] The width of the reflective tape 10 is preferably 2 mm, and the photogrammetric camera 13 measures the length between the center lines of the two reflective tapes 10 when measuring the distance. The retractor 5 is used to manage and adjust the length of the safety belt. A locker 14 is provided inside the retractor 5. The locker 14 is a centrifugal locker. The retractor 5 quickly locks the safety belt when the pulley 2 suddenly slows down or collides to prevent the safety belt from being pulled out further.

[0030] The utility model can indirectly measure acceleration by testing linear displacement and capturing the time when two adjacent reflective stickers pass through the linear displacement. Specifically, the required acceleration parameters are calculated according to formula I and formula II.

[0031]

[0032] Where S is the linear displacement length, in m; V0 is the initial velocity, in m / s, which is zero because it is stationary; t is the time used, in s; a is the acceleration, in m / s 2 ;

[0033] From the above formula, we can see that as long as we measure S and t, we can convert the acceleration a;

[0034] The linear displacement length is measured by a photogrammetric camera 13, and the time taken is measured by an infrared time measuring device 12. The infrared time measuring device 12 uses infrared to record the time taken to pass through two reflective stickers 10 attached to the safety belt.

[0035] In the utility model, the acceleration used by the car seat belt tester is the constant acceleration principle, which is numerically equal to the change in speed per unit time. The utility model can indirectly measure the acceleration by testing the linear displacement and capturing the time for two adjacent reflective stickers to pass in the linear displacement. The initial velocity is small enough, close to 0, so the V0t item is taken as zero. The width of the reflective sticker is 2mm, and the time for the infrared ray to scan is very short, close to 0, so it is negligible. When measuring the distance, measure the length of the center line of the two reflective stickers. When measuring, the crossbar of the car seat belt tester is painted or pasted with black paint or black tape as a whole to prevent the infrared ray from scanning stray light.

[0036] The utility model uses an infrared time measuring device to measure time. Its principle is to use infrared to measure time intervals and use infrared as a detection medium. It is composed of an infrared transmitter and receiver, an optical path system and an electronic timing circuit. A photogrammetry system (photogrammetry camera) is used to measure distance. The photogrammetry camera has a high-precision measurement function and can measure the target object accurately at the millimeter level. By shooting the image of the reflective tape on the seat belt, the pixel distance between the two reflective tapes is calculated and then converted into the actual distance.

[0037] The acceleration calibration device of the automobile safety belt tester described in the utility model mainly includes a basic frame, a driving system, a safety belt fixing device, a control system and a retractor. Among them:

[0038] In the basic frame, the test bench is composed of a sturdy metal frame to ensure stability during the test; the motor-driven cam and follower mechanism are connected to the pulley mounted on the guide rail with a steel cable, and the pulley is equipped with a rotatable bracket to change the position of the retractor installed on it relative to the direction of movement of the pulley.

[0039] In the driving system, the cam is driven by a motor, and its follower mechanism is connected to the pulley mounted on the guide rail by a steel cable. The combination of the cam design and the motor speed can obtain acceleration under the speed growth rate.

[0040] The seat belt anchorage is used to simulate the way the seat belts are installed in the car, ensuring that the test conditions match actual usage.

[0041] The control system includes a control panel, computer or other electronic equipment used to set test parameters, start tests and collect data.

[0042] The retractor is a key component in the automobile seat belt system. Its main function is to manage and adjust the length of the seat belt to ensure that passengers can wear the seat belt comfortably under normal circumstances. When the vehicle suddenly decelerates or collides, the retractor can be quickly locked to prevent the seat belt from being pulled out further, thereby limiting the forward rush of the passengers and reducing injuries. Specifically, in emergency situations, such as sudden braking or collision, the rapid pulling out of the seat belt will trigger the locking mechanism in the retractor. The locking mechanism is usually a centrifugal lock or similar device. When the pulling out speed of the seat belt exceeds a certain threshold, the centrifugal force will activate the lock. Once the lock is activated, it will prevent the retractor from continuing to rewind, thereby quickly locking the seat belt and limiting the forward rush of the passengers.

[0043] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field. The standard parts used can be purchased from the market, and special-shaped parts can be customized according to the records in the specification and drawings. The specific connection methods of each part adopt mature conventional means such as bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0044] The present invention is not limited to the above-mentioned implementation modes, and any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be considered as equivalent replacement modes and shall be included in the protection scope of the present invention.

Claims

1. An acceleration calibration device for a car seat belt tester, characterized in that: The invention comprises a metal frame (1), wherein a pulley (2) and a first pulley (3) are arranged on an upper test bench of the metal frame (1), a rotatable bracket (4) is arranged on the pulley (2), a retractor (5) is arranged on the bracket (4), a driving mechanism, a second pulley (8) and a safety belt fixing device (9) are arranged on a lower test bench of the metal frame (1), the driving mechanism is connected to the pulley (2) arranged on a guide rail, a safety belt is fixedly connected to the safety belt fixing device (9), the safety belt passes through the second pulley (8), the first pulley (3) and the retractor (5) in sequence, and the second pulley (8) and the first pulley (8) are connected to each other. 3) is arranged vertically, two reflective stickers (10) are attached to the vertically arranged seat belt at intervals, a measuring device (11) is arranged opposite to the reflective stickers (10), the measuring device (11) comprises an infrared time measuring device (12) and a photogrammetric camera (13), the infrared time measuring device (12) is used to measure the time for infrared rays to pass through the two reflective stickers (10), the photogrammetric camera (13) is used to measure the displacement corresponding to the two reflective stickers (10), and the infrared time measuring device (12) and the photogrammetric camera (13) are respectively connected to a control system via lines.

2. The device according to claim 1, characterized in that: The driving mechanism comprises a motor (6) and a cam (7). The cam (7) is mounted on the output end of the motor (6) and driven by the motor (6). The follower mechanism of the cam (7) is connected to a pulley (2) mounted on a guide rail by a steel cable.

3. The device according to claim 1, characterized in that: The control system comprises a main body (15) and a display screen (16) arranged on one side of the main body (15), wherein the display screen (16) is used to display data and perform touch operations, and an indicator light (17), a switch (18), a voice prompter (19), a controller (20) and a storage device (21) are arranged on the other side of the main body (15), wherein the voice prompter (19) is used to listen to voice and receive conversations, and the storage device (21) is used to store data.

4. The device according to claim 1, characterized in that: An acceleration sensor and a tension sensor are also provided. The acceleration sensor is used to measure the acceleration borne by the safety belt in real time, and the tension sensor is used to measure the tension borne by the safety belt in real time. The acceleration sensor and the tension sensor are respectively connected to the control system through lines.

5. The device according to any one of claims 1 to 4, characterized in that: The infrared time measuring device (12) comprises an infrared transmitter and receiver, an optical path system and an electronic timing circuit, wherein the infrared transmitter and receiver are electrically connected to the optical path system and the electronic timing circuit respectively.

6. The device according to any one of claims 1 to 4, characterized in that: The entire front of the crossbar between the infrared time measuring device (12) and the two reflective stickers (10) is painted with black paint or pasted with black tape to prevent stray light from being detected by infrared scanning.

7. The device according to claim 1, characterized in that: The retractor (5) is used to manage and adjust the length of the safety belt. A locker (14) is arranged inside the retractor (5). The locker (14) is a centrifugal locker. When the pulley (2) suddenly decelerates or collides, the retractor (5) quickly locks the safety belt to prevent the safety belt from being pulled out further.

8. The device according to claim 1, characterized in that: The width of the reflective tape (10) is 2 mm, and the photogrammetric camera (13) measures the length between the center lines of two reflective tapes (10) when measuring the distance.

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