Device and method for detecting locking force of lock tongue and lock head of automobile safety belt

Abstract

The invention discloses a device and method for detecting the locking force of a lock tongue and a lock head of an automobile safety belt, and the device comprises a lock head positioning mechanism which is used for positioning the lock head and outputting a locking sensor signal of the lock head; the lock head pressing mechanism is used for being matched with the lock head positioning mechanism and pressing the lock head in the lock head positioning mechanism; a first guide rail; the inserting and pulling mechanism comprises a spring bolt inserting and pulling mechanism and an inserting and pulling mechanism drive, the spring bolt inserting and pulling mechanism is installed on the first guide rail in a sliding mode, and the inserting and pulling mechanism drive is used for providing driving force for sliding of the spring bolt inserting and pulling mechanism; the unlocking mechanism comprises a simulation unlocking mechanism and an unlocking mechanism drive, the simulation unlocking mechanism is installed on the first guide rail in a sliding mode, and the unlocking mechanism drive is used for providing driving force for sliding of the simulation unlocking mechanism; and the bottom plate is used for mounting the lock head positioning mechanism, the lock head pressing mechanism, the plugging mechanism and the unlocking mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle testing, and particularly to a device and method for detecting the locking force of a seat belt tongue and buckle of a vehicle. Background Art

[0002] A seat belt is an important protective structure in a vehicle. When a vehicle collides, the seat belt can restrict the displacement of the driver and passengers and buffer the impact energy, thus playing a role in protecting the safety of the passengers.

[0003] During the production process of seat belts, the existing detection method uses two sets of servo drive systems. One set is directly connected to a force sensor and then directly drives the tongue to apply a pressing (pulling) force to the tongue, and the other set is directly connected to a force sensor and then drives a simulated finger to press the unlocking button. Due to the certain rigidity of the detection system and the tested product, the stroke is extremely small at the moment when the tongue is inserted into and pulled out of the buckle to unlock. A tiny change in the stroke of the servo system results in a large change in the pressing (pulling) force, that is, the slope of the curve of the displacement and output force of the servo system is large, and the feedback of the force sensor lags significantly behind the locking sensor signal (locking or unlocking signal). Due to the rigid connection, after pressing the unlocking button to unlock, the tongue cannot be automatically ejected, and the actual working state of the product is not fully simulated, and the locking sensor cannot timely feedback the unlocking signal. Based on the above two points, the detection force shown by the existing technical structure system deviates greatly from the actual value of the product, and the performance parameters of the product cannot be truly detected.

[0004] The information disclosed in this background art section is only for enhancing the understanding of the general background of the present invention and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art already known to those of ordinary skill in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide a device and method for detecting the locking force of a seat belt tongue and buckle of a vehicle that can accurately feedback the insertion and extraction pulling force.

[0006] To achieve the above object, the present invention provides a detecting device for the locking force of an automotive seat belt tongue and buckle, comprising: a buckle positioning mechanism for positioning the buckle and outputting a locking sensor signal of the buckle; a buckle pressing mechanism for cooperating with the buckle positioning mechanism to press the buckle in the buckle positioning mechanism; a first guide rail; a plugging and unplugging mechanism including a tongue plugging and unplugging mechanism and a plugging and unplugging mechanism driver, wherein the tongue plugging and unplugging mechanism is slidably mounted on the first guide rail, the tongue plugging and unplugging mechanism is used for assembling the tongue, applying an insertion force to the tongue by sliding to insert the tongue into the buckle and detecting the insertion force, and applying an unlocking pre-tightening force to the tongue during unlocking, and the plugging and unplugging mechanism driver is used for providing a driving force for the sliding of the tongue plugging and unplugging mechanism; an unlocking mechanism including a simulation unlocking mechanism and an unlocking mechanism driver, wherein the simulation unlocking mechanism is slidably mounted on the first guide rail, the simulation unlocking mechanism includes a simulation finger, the simulation unlocking mechanism can drive the simulation finger to apply an unlocking force to the unlocking button of the buckle by sliding and detect the unlocking force, and the unlocking mechanism driver is used for providing a driving force for the sliding of the simulation unlocking mechanism; a bottom plate for mounting the buckle positioning mechanism, the buckle pressing mechanism, the plugging and unplugging mechanism and the unlocking mechanism.

[0007] In an embodiment of the present invention, the buckle pressing mechanism includes: a frame and a pressing mechanism body mounted on the frame; the frame includes two symmetrically arranged legs and a cross frame for connecting the legs, and the pressing mechanism body is arranged on the cross frame; the pressing mechanism body includes a cylinder, a telescopic rod and a pressing block, the pressing block is fixed at one end of the telescopic rod, and the cylinder is connected to the other end of the telescopic rod for driving the telescopic rod to extend and retract.

[0008] In an embodiment of the present invention, the buckle positioning mechanism includes: a buckle positioning component including a clamping groove, the shape of the clamping groove matching the buckle for clamping the buckle; a buckle secondary support component including a support portion and a buckle sensor socket component, the top surface of the support portion being flat for supporting the connection structure at the rear end of the buckle, and the buckle sensor socket component being able to match the sensor wire harness on the buckle.

[0009] In an embodiment of the present invention, the buckle sensor socket component includes a signal output module, and the signal output module can receive the signal input by the sensor wire harness and export the sensor signal to the control system of the detecting device.

[0010] In an embodiment of the present invention, the plugging and unplugging mechanism drive includes: a first load bearing, including a first one-way load bearing assembly and a first two-way load bearing assembly arranged in parallel; a second guide rail, which is arranged between the first one-way load bearing assembly and the first two-way load bearing assembly; a first lead screw, one end of the first lead screw is rotatably fixed on the first one-way load bearing assembly, and the other end is rotatably fixed on the first two-way load bearing assembly; a first motor, the first motor includes a first servo motor and a first motor seat, the first motor seat is used for installing the first servo motor, the first servo motor is connected to the other end of the first lead screw through a first coupling, and the first motor is used to control the movement of the first lead screw; a first drive block, the first drive block includes a first terminal and a second terminal, the terminal is installed on the first lead screw and can move along with the movement of the first lead screw, the first terminal and the first lead screw are connected through a first ball nut, the first ball nut includes a first internal thread hole and a first flange surface, a first guide rail slider is arranged at the bottom of the first terminal, and the first guide rail slider can slide on the second guide rail; the second terminal is slidably connected to the tongue plugging and unplugging mechanism, and the movement of the second terminal can be driven by the movement of the first terminal; the tongue plugging and unplugging mechanism includes: a tongue bracket, including a tongue bracket body, a second guide rail slider, a first force sensor, and a second guide rail of the first force sensor, the second guide rail is arranged between the first one-way load bearing assembly and the first two-way load bearing assembly; a first lead screw, one end of the first lead screw is rotatably fixed on the first one-way load bearing assembly, and the other end is rotatably fixed on the first two-way load bearing assembly; a first motor, the first motor includes a first servo motor and a first motor seat, the first motor seat is used for installing the first servo motor, the first servo motor is connected to the other end of the first lead screw through a first coupling, and the first motor is used to control the movement of the first lead screw; a first drive block, the first drive block includes a first terminal and a second terminal, which are connected through the connecting plate, the connecting plate is perpendicular to the first horizontal plate and the second horizontal plate, and the connecting plate can be fixed on the second guide rail slider to realize the linkage between the tongue bracket and the first drive bracket; the first driving member includes a first guide post, a first tongue spring, and a second tongue spring, the first guide post is arranged between the first horizontal plate and the second horizontal plate, one end of the second terminal is slidably connected to the first guide post, the first tongue spring is arranged outside the first guide post between the first horizontal plate and the second terminal, and the second tongue spring is arranged outside the first guide post between the second horizontal plate and the second terminal.

[0011] In an embodiment of the present invention, the unlocking mechanism drive includes: a second load bearing, including a second one-way load bearing assembly and a second two-way load bearing assembly arranged in parallel; a third guide rail, the third guide rail is arranged between the second one-way load bearing assembly and the second two-way load bearing assembly; a second lead screw, one end of the second lead screw is rotatably fixed on the second one-way load bearing assembly, and the other end is rotatably fixed on the second two-way load bearing assembly; a second motor, the second motor includes a second servo motor and a second motor base, the second motor base is used to install the second servo motor, the second servo motor is connected to the other end of the second lead screw through a second coupling, and the second motor is used to control the movement of the second lead screw; a second driving block, the second driving block includes a third terminal and a fourth terminal, the third terminal is installed on the second lead screw and can move along with the movement of the second lead screw, the third terminal and the second lead screw are connected through a second ball nut, the second ball nut includes a second internal thread hole and a second flange surface, a third guide rail slider is provided at the bottom of the third terminal, and the third guide rail slider can slide on the third guide rail; the fourth terminal is slidably connected to the simulation unlocking mechanism, and the movement of the fourth terminal can be driven by the movement of the third terminal; the simulation unlocking mechanism includes: a simulation finger bracket, a fourth guide rail slider, a second force sensor, and a second force sensor bracket, the simulation finger is installed at one end of the second force sensor, the other end of the second force sensor is installed on the second force sensor bracket, the second force sensor is used to measure the force received by the simulation finger, the fourth guide rail slider is slidably connected to the first guide rail, and the second force sensor bracket is fixed on the fourth guide rail slider; a second driving bracket, including a second driving bracket body and a second driving member, the second driving member includes a second guide post and an unlocking driving spring arranged outside the second guide post, the second driving bracket body is fixed on the fourth guide rail slider, and the second driving bracket body is fixedly connected to one end of the second guide post, one end of the guide post is fixedly connected, a limiting structure is provided at the end of the other end of the second guide post, the limiting structure is used to limit the outward displacement of the fourth terminal, the fourth terminal is slidably connected to the second guide post, and the unlocking driving spring is located between the fourth terminal and the second driving bracket body.

[0012] In an embodiment of the present invention, a protective plate is provided on the outside of the bottom plate for protecting the plugging and unplugging mechanism and the unlocking mechanism.

[0013] The present invention also provides a method for detecting the locking force of an automotive seat belt tongue and buckle, which is used to implement an automotive seat belt tongue and buckle locking force detection device as described in any one of the above, including: S1: Install the buckle on the buckle positioning mechanism, connect the sensor wire harness of the buckle to the buckle sensor socket assembly, and export the buckle locking sensor signal; S2: The plugging and unplugging mechanism is started to drive the tongue close to the buckle; S3: Detect the locking force of the tongue and determine whether the locking force meets the standard; S4: If the locking force does not meet the standard, stop the detection. If it meets the standard, the plugging and unplugging mechanism reverses to apply an unlocking pre-tightening force to the tongue; S5: The unlocking mechanism is started to press the unlocking button on the buckle to unlock the buckle; S6: Detect the pressing unlocking force and determine whether the locking force meets the standard.

[0014] In another embodiment of the present invention, the detecting the locking force of the tongue and determining whether the locking force meets the standard includes: S301: Set the qualified value N1 of the insertion driving force detection; S302: Divide the qualified value of the insertion driving force detection into 2n + 1 segments, with a difference of f1 (f1 ≤ N1 / n) for each segment, to obtain 2n + 1 set forces, and the set forces for each segment are in turn: N1 - nf1... N1... N1 + nf1; S303: Detect the insertion force F1 of the tongue. When the detected insertion force F1 ≥ 0, reduce the insertion speed; S304: Continue to detect the insertion force F1 of the tongue. When the insertion force F1 of the tongue reaches N1 - nf1, pause, and the locking sensor determines whether it is locked; S305: If it is locked, the detection is completed. At this time, the locking force F is equal to the insertion force F1. If it is not locked, continue to insert at a low speed and pause when reaching the next set force, and the locking sensor determines whether it is locked; S306: Repeat the above steps to obtain the locking force F of the buckle. If when F ≤ N1, the locking sensor determines that the buckle and the tongue are locked, then the locking force meets the standard and the buckle is qualified. If it fails to lock successfully, it is determined that the buckle is unqualified.

[0015] In another embodiment of the present invention, the detecting the pressing unlocking force and determining whether the locking force meets the standard includes: S601: Set the unlocking pre-tightening force N2, as well as the maximum qualified value F2max of the pulling force detection and the minimum qualified value F2min of the pulling force detection; S602: Apply an initial pulling force f less than F2 min (f < F2 min) and determine whether the tongue pops out. If it pops out, stop the detection; S603: Divide the qualified value of the unlocking driving force detection into m segments, with a difference of f2 (f2 = (F2max - f) / m) for each segment; S604: Starting from F2 = f, apply the pulling force F2 in segments and detect whether the tongue pops out. If it pops out, stop the detection. At this time, the unlocking force F' = F2. If it does not pop out, apply the next segment of pulling force and continue the detection; S605: If F2 min ≤ F' ≤ F2 max, the unlocking force meets the standard and the buckle is qualified.

[0016] Compared with the prior art, a locking force detection device for a car seat belt tongue and buckle according to the present invention can fix the buckle of the seat belt, and is provided with an insertion and extraction mechanism for fixing the tongue. A force sensor is provided on the insertion and extraction mechanism, which can slowly insert the tongue into the buckle and detect the insertion force during insertion, and an unlocking mechanism with a force sensor is provided, which can drive a simulated finger to press the unlocking button on the buckle and detect the unlocking force during unlocking. By detecting whether the insertion force and the unlocking force are compliant, it can be determined whether the buckle is qualified. The insertion mechanism and the unlocking mechanism are driven by a servo mechanism. By setting a servo mechanism that is more sensitive to displacement changes, the change speed of the pulling force and the pressure of the servo mechanism slows down, making the synchronization of the signals of the force sensor and the locking sensor better, and the detection of the locking force and the unlocking force more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural diagram of a locking force detection device for a car seat belt tongue and buckle according to an embodiment of the present invention;

[0018] Figure 2 is a structural diagram of a buckle pressing mechanism of a locking force detection device for a car seat belt tongue and buckle according to an embodiment of the present invention;

[0019] Figure 3 is a structural diagram of a buckle positioning mechanism of a locking force detection device for a car seat belt tongue and buckle according to an embodiment of the present invention;

[0020] Figure 4 is a structural diagram of a bottom plate of a locking force detection device for a car seat belt tongue and buckle according to an embodiment of the present invention;

[0021] Figure 5 is a top view of an insertion and extraction mechanism of a locking force detection device for a car seat belt tongue and buckle according to an embodiment of the present invention;

[0022] Figure 6 is a structural diagram of an insertion and extraction mechanism of a locking force detection device for a car seat belt tongue and buckle according to an embodiment of the present invention;

[0023] Figure 7 is a side view of an insertion and extraction mechanism of a locking force detection device for a car seat belt tongue and buckle according to an embodiment of the present invention;

[0024] Figure 8 is a top view of an unlocking mechanism of a locking force detection device for a car seat belt tongue and buckle according to an embodiment of the present invention;

[0025] Figure 9 is a structural diagram of an unlocking mechanism of a locking force detection device for a car seat belt tongue and buckle according to an embodiment of the present invention;

[0026] Figure 10 It is a side view of the unlocking mechanism of a locking force detection device for a vehicle seat belt tongue and buckle according to an embodiment of the present invention;

[0027] Figure 11 It is a flowchart of a method for detecting the locking force of a vehicle seat belt tongue and buckle according to an embodiment of the present invention.

[0028] Main reference numerals description:

[0029] 1 - First guide rail, 2 - Tongue insertion and extraction mechanism, 21 - Tongue bracket, 211 - Tongue bracket body, 212 - Second guide rail slider, 213 - First force sensor, 214 - First force sensor bracket, 22 - First drive bracket, 221 - First drive bracket body, 2211 - First cross plate, 2212 - Second cross plate, 2213 - Connecting plate, 222 - First drive member, 2221 - First guide post, 2222 - First tongue spring, 2223 - Second tongue spring, 23 - Tongue, 3 - Insertion and extraction mechanism drive, 31 - First drive block, 311 - First terminal, 312 - Second terminal, 313 - First guide rail slider, 32 - First load bearing, 321 - First one-way load bearing assembly, 322 - First two-way load bearing assembly, 33 - Second guide rail, 34 - First lead screw, 35 - First motor, 351 - First servo motor, 352 - First motor base, 36 - First coupling, 37 - First ball nut, 4 - Simulation unlocking mechanism, 41 - Simulation finger, 42 - Simulation finger bracket, 421 - Fourth guide rail slider, 422 - Second force sensor, 423 - Second force sensor bracket, 43 - Second drive bracket, 431 - Second drive bracket body, 432 - Second drive member, 4321 - Second guide post, 4322 - Unlocking drive spring, 4323 - Limit structure, 5 - Unlocking mechanism drive, 51 - Second drive block, 511 - Third terminal, 512 - Fourth terminal, 513 - Third guide rail slider, 52 - Second load bearing, 521 - Second one-way load bearing assembly, 522 - Second two-way load bearing assembly, 53 - Third guide rail, 54 - Second lead screw, 55 - Second motor, 551 - Second servo motor, 552 - Second motor base, 56 - Second coupling, 57 - Second ball nut, 6 - Buckle positioning mechanism, 61 - Buckle positioning assembly, 611 - Clamping groove, 62 - Buckle sub - support assembly, 621 - Support part, 622 - Sensor socket assembly, 7 - Buckle pressing mechanism, 71 - Frame, 711 - Leg, 712 - Cross frame, 72 - Pressing mechanism body, 721 - Cylinder, 722 - Expansion rod, 723 - Pressing block, 8 - Base plate, 81 - First base, 82 - Second base, 83 - Protective plate, 9 - Buckle, 91 - Buckle sub, 92 - Sensor wire harness, 93 - Unlock button. Detailed implementation manners

[0030] The following will describe in detail the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0031] Unless otherwise clearly stated, in the whole specification and claims, the term "comprising" or its variations such as "including" or "having" etc. will be understood to include the stated elements or components, without excluding other elements or other components.

[0032] Inventive concept: In this application, the tongue insertion and extraction mechanism is driven by the plugging and unplugging mechanism to drive the tongue insertion and extraction mechanism to move, driving the tongue to insert into the lock head. A first force sensor is provided on the tongue insertion and extraction mechanism, which can measure the insertion force of the tongue into the lock head. By judging whether it meets the preset value, it can be determined whether the insertion force of the lock head is qualified. After the tongue is inserted into the lock head, the plugging and unplugging mechanism drives the tongue insertion and extraction mechanism in the reverse direction to apply a pre-tightening force to the tongue. The simulation unlocking mechanism presses the unlocking button on the lock head under the action of the unlocking mechanism drive. A second force sensor is provided on the simulation unlocking mechanism, which can measure the pressure of the simulation finger pressing the unlocking button. By judging whether it meets the preset value, it can be determined whether the unlocking force of the lock head is qualified. Combining the two, by whether the insertion force and the unlocking force are qualified, it can be detected whether the product performance parameters of the tongue and the lock head are qualified.

[0033] As Figures 1 to 11 shown, a device for detecting the locking force of an automotive seat belt tongue and lock head according to a preferred embodiment of the present invention includes: a lock head 9 positioning mechanism 6 for positioning the lock head 9 and outputting a locking sensor signal of the lock head 9; a lock head 9 pressing mechanism 7 for cooperating with the lock head 9 positioning mechanism 6 to press the lock head 9 in the lock head 9 positioning mechanism 6; a first guide rail 1; a plugging and unplugging mechanism including a tongue 23 insertion and extraction mechanism 2 and a plugging and unplugging mechanism drive 3. The tongue 23 insertion and extraction mechanism slides on the first guide rail 1. The tongue 23 insertion and extraction mechanism 2 is used to assemble the tongue 23, apply an insertion force to the tongue 23 through sliding to insert the tongue 23 into the lock head 9 and detect the insertion force, and apply an unlocking pre-tightening force to the tongue 23 during unlocking. The plugging and unplugging mechanism drive 3 is used to provide a driving force for the sliding of the tongue 23 insertion and extraction mechanism 2; an unlocking mechanism including a simulation unlocking mechanism 4 and an unlocking mechanism drive 5. The simulation unlocking mechanism 4 slides on the first guide rail 1. The simulation unlocking mechanism 4 includes a simulation finger 41. The simulation unlocking mechanism 4 can drive the simulation finger 41 to apply an unlocking force to the unlocking button 93 of the lock head 9 through sliding and detect the unlocking force. The unlocking mechanism drive 5 is used to provide a driving force for the sliding of the simulation unlocking mechanism 4; a bottom plate 8 for installing the lock head 9 positioning mechanism 6, the lock head 9 pressing mechanism 7, and the plugging and unplugging mechanism and the unlocking mechanism.

[0034] Specifically, the positions of the lock head 9 positioning mechanism 6 and the lock head 9 pressing mechanism 7 match. When the pressing block 723 of the lock head 9 pressing mechanism 7 descends, it can just press the lock head 9 in the clamping groove 611 of the lock head 9 positioning assembly 61. The lock head 9 includes an unlocking button 93 and a secondary lock head 91. The unlocking button 93 faces the lock tongue 23 insertion and extraction mechanism 2, and the lock tongue 23 support body 211 of the lock tongue 23 insertion and extraction mechanism 2, the simulation finger 41 of the simulation unlocking mechanism 4, and the clamping groove 611 are coaxial. When moving on the first guide rail 1, the lock tongue 23 and the simulation finger 41 can smoothly interfere with the lock head 9. The simulation unlocking mechanism 4 is located between the lock tongue 23 insertion and extraction mechanism 2 and the locking and positioning mechanism. Since the lock tongue 23 support body 211 is in the shape of a long arm. The length of the lock tongue 23 support body 211 plus the length of the lock tongue 23 is greater than the length of the simulation finger support 42 body. When the lock tongue 23 is inserted into the lock head 9, it does not affect the compression distance required for the simulation finger 41 structure to drive the unlocking drive spring 4322. Since the lock tongue 23 needs to continue to apply a pre-tightening force after being inserted into the lock head 9, the second guide rail 33 slider 212 on the first guide rail 1 needs to continue to move backward. To prevent interference between the second guide rail 33 slider 212 and the fourth guide rail slider 421 on the first guide rail 1, the lock tongue 23 insertion and extraction mechanism 2 should be located behind the simulation unlocking mechanism 4, that is, the simulation unlocking mechanism 4 is located between the lock tongue 23 insertion and extraction mechanism 2 and the lock head 9.

[0035] As an optional implementation manner, the lock head 9 pressing mechanism 7 includes: a frame 71 and a pressing mechanism body 72. The pressing mechanism body 72 is installed on the frame 71; the frame 71 includes two symmetrically arranged feet 711 and a cross frame 712 for connecting the feet 711. The pressing mechanism body 72 is arranged on the cross frame 712; the pressing mechanism body 72 includes a cylinder 721, a telescopic rod 722, and a pressing block 723. The pressing block 723 is fixed to one end of the telescopic rod 722, and the cylinder 721 is connected to the other end of the telescopic rod 722 for driving the telescopic rod 722 to expand and contract.

[0036] Specifically, the telescopic rod 722 is driven by the cylinder 721 and is controlled by a sensor. When it is detected that the sensor wire harness 92 is inserted into the sensor socket assembly 622, the cylinder 721 automatically pushes the compression rod to press the lock head 9.

[0037] As an alternative embodiment, the lock head 9 positioning mechanism 6 includes: a lock head 9 positioning assembly 61, including a clamping groove 611, the shape of the clamping groove 611 matching that of the lock head 9 for clamping the lock head 9; a lock head sub 91 support assembly 62, including a support portion 621 and a lock head 9 sensor socket assembly 622, the top surface of the support portion 621 being flat for supporting the connection structure at the rear end of the lock head 9, and the lock head 9 sensor socket assembly 622 being capable of matching the sensor harness 92 on the lock head 9.

[0038] Specifically, the lock head 9 includes a lock head 9 body, an unlocking button, and a lock head sub 91. The unlocking button and the lock head sub 91 are located on opposite sides. The lock head sub 91 support assembly 62 is located at the rear end of the lock head 9 positioning assembly 61. The rear end means that after the lock head 9 is fixed on the lock head 9 positioning assembly 61, the unlocking button 93 on the lock head 9 faces one side, and the rear end of the lock head 9 has a lock head sub 91, and the lock head sub 91 is located on the other side opposite to the unlocking button 93. Therefore, the lock head sub 91 support assembly 62 is located on the side opposite to the unlocking button 93. The lock head 9 sensor socket assembly 622 can match the plug of the sensor harness 92 on the lock head 9 and receive the signals of the sensors on the lock head 9. The clamping groove 611 is located at the top of the lock head 9 positioning assembly 61 for clamping the lock head 9 and can expose the unlocking button and the lock head sub 91.

[0039] As an alternative embodiment, the lock head 9 sensor socket assembly 622 includes a signal output module, which can receive the signals input by the sensor harness 92 and export the sensor signals to the control system of the detection device.

[0040] Specifically, the signal output by the sensor is: a signal for determining locking inside the lock head 9. The signal is output to the control systems of the plugging and unplugging mechanism and the unlocking mechanism.

[0041] As an alternative embodiment, the plugging and unplugging mechanism drive 3 includes: a first load bearing 32, including a first one-way load bearing assembly 321 and a first two-way load bearing assembly 322 arranged in parallel; a second guide rail 33, which is arranged between the first one-way load bearing assembly 321 and the first two-way load bearing assembly 322; a first lead screw 34, one end of the first lead screw 34 is rotatably fixed on the first one-way load bearing assembly 321, and the other end is rotatably fixed on the first two-way load bearing assembly 322; a first motor 35, the first motor 35 includes a first servo motor 351 and a first motor base 352, the first motor base 352 is used to mount the first servo motor 351, the first servo motor 351 is connected to the other end of the first lead screw 34 through a first coupling 36, and the first motor 35 is used to control the movement of the first lead screw 34; a first drive block 31, the first drive block 31 includes a first terminal 311 and a second terminal 312, the terminals are mounted on the first lead screw 34 and can move along with the movement of the first lead screw 34, the first terminal 311 and the first lead screw 34 are connected through a first ball nut 37, the first ball nut 37 includes a first internal thread hole and a first flange surface, a first guide rail slider 313 is provided at the bottom of the first terminal 311, and the first guide rail slider 313 can slide on the second guide rail 33; the second terminal 312 is slidably connected to the plugging and unplugging mechanism 2 of the locking tongue 23, and the movement of the second terminal 312 can be driven by the movement of the first terminal 311; the plugging and unplugging mechanism 2 of the locking tongue 23 includes: a locking tongue 23 bracket 21, including a locking tongue 23 bracket body 211, a second guide rail 33 slider 212, a first force sensor 213, and a second guide rail 33 of the first force sensor 213, the second guide rail 33 is arranged between the first one-way load bearing assembly 321 and the first two-way load bearing assembly 322; a first lead screw 34, one end of the first lead screw 34 is rotatably fixed on the first one-way load bearing assembly 321, and the other end is rotatably fixed on the first two-way load bearing assembly 322; a first motor 35, the first motor 35 includes a first servo motor 351 and a first motor base 352, the first motor base 352 is used to mount the first servo motor 351, the first servo motor 351 is connected to the other end of the first lead screw 34 through a first coupling 36, and the first motor 35 is used to control the movement of the first lead screw 34; a first drive block 31, the first drive block 31 includes a first terminal 311 and a second terminal 312, which are connected through the connecting plate 2213, the connecting plate 2213 is perpendicular to the first horizontal plate 2211 and the second horizontal plate 2212, and the connecting plate 2213 can be fixed on the second guide rail 33 slider 212 to realize the linkage between the locking tongue 23 bracket 21 and the first drive bracket 22;The first driving member 222 includes a first guide post 2221, a first locking tongue 23 spring 2222, and a second locking tongue 23 spring 2223. The first guide post 2221 is disposed between the first horizontal plate 2211 and the second horizontal plate 2212. One end of the second terminal 312 is slidably connected to the first guide post 2221. The first locking tongue 23 spring 2222 is disposed outside the first guide post 2221 between the first horizontal plate 2211 and the second terminal 312. The second locking tongue 23 spring 2223 is disposed outside the first guide post 2221 between the second horizontal plate 2212 and the second terminal 312.;

[0042] Specifically, during use, the first servo motor 351 rotates, drives the first lead screw 34 to rotate through the first coupling 36, pushes the first ball nut 37 to drive the first driving block 31 to reciprocate linearly on the second guide rail 33. The first terminal 311 of the first driving block 31 drives the second terminal 312 to move on the first guide post 2221. When the second terminal 312 reciprocates, it respectively compresses the first locking tongue 23 spring 2222 and the second locking tongue 23 spring 2223. By the compression of the first locking tongue 23 spring 2222 and the second locking tongue 23 spring 2223, the first driving bracket 22 is pushed, realizing the reciprocating movement of the first driving bracket 22. The first driving bracket 22 drives the first force sensor bracket 214 to reciprocate. The first force sensor bracket 214 drives the locking tongue 23 to reciprocate through the locking tongue 23 bracket body 211, realizing the insertion and ejection functions of the locking tongue 23. During forward movement, the locking tongue 23 approaches the lock head 9, and the locking tongue 23 receives the applied insertion force. As the first locking tongue 23 spring 2222 is compressed, the insertion force gradually increases, and the magnitude of the insertion force is measured by the first force sensor 213. During reverse movement, the locking tongue 23 moves away from the lock head 9. At this time, the locking tongue 23 is still inserted into the lock head 9, so the locking tongue 23 receives the applied pre-tightening force.

[0043] As an alternative embodiment, the unlocking mechanism drive 5 includes: a second load bearing 52, including a second one-way load bearing assembly 521 and a second two-way load bearing assembly 522 arranged in parallel; a third guide rail 53, which is arranged between the second one-way load bearing assembly 521 and the second two-way load bearing assembly 522; a second lead screw 54, one end of the second lead screw 54 is rotatably fixed on the second one-way load bearing assembly 521, and the other end is rotatably fixed on the second two-way load bearing assembly 522; a second motor 55, the second motor 55 includes a second servo motor 551 and a second motor base 552, the second motor base 552 is used to mount the second servo motor 551, the second servo motor 551 is connected to the other end of the second lead screw 54 through a second coupling 56, and the second motor 55 is used to control the movement of the second lead screw 54; a second drive block 51, the second drive block 51 includes a third terminal 511 and a fourth terminal 512, the third terminal 511 is mounted on the second lead screw 54 and can move along with the movement of the second lead screw 54, the third terminal 511 and the second lead screw 54 are connected through a second ball nut 57, the second ball nut 57 includes a second internal thread hole and a second flange surface, a third guide rail slider 513 is provided at the bottom of the third terminal 511, and the third guide rail slider 513 can slide on the third guide rail 53; the fourth terminal 512 is slidably connected to the simulation unlocking mechanism 4, and the movement of the fourth terminal 512 can be driven by the movement of the third terminal 511; the simulation unlocking mechanism 4 includes: a simulation finger bracket 42, a fourth guide rail slider 421, a second force sensor 422, and a second force sensor bracket 423, the simulation finger 41 is mounted on one end of the second force sensor 422, the other end of the second force sensor 422 is mounted on the second force sensor bracket 423, the second force sensor 422 is used to measure the force on the simulation finger 41, the fourth guide rail slider 421 is slidably connected to the first guide rail 1, and the second force sensor bracket 423 is fixed on the fourth guide rail slider 421;The second driving bracket 43 includes a second driving bracket body 431 and a second driving member 432. The second driving member 432 includes a second guide post 4321 and an unlocking driving spring 4322 disposed outside the second guide post 4321. The second driving bracket body 431 is fixed on the fourth guide rail slider 421, and the second driving bracket body 431 is fixedly connected to one end of the second guide post 4321. A limiting structure 4323 is provided at the end of the other end of the guide post. The limiting structure 4323 is used to limit the outward displacement of the fourth terminal 512. The fourth terminal 512 is slidably connected to the second guide post 4321. The unlocking driving spring 4322 is located between the fourth terminal 512 and the second driving bracket body 431.;

[0044] Specifically, the second servo motor 551 rotates, drives the second lead screw 54 to rotate through the second coupling 56, pushes the second ball nut 57 to drive the second driving block 51 to reciprocate linearly on the third guide rail 53. The third terminal 511 drives the fourth terminal 512 to move on the second guide post 4321. When unlocking, the second driving block 51 compresses the unlocking driving spring 4322, pushes the second driving bracket 43 through the unlocking driving spring 4322. The second driving bracket 43 drives the second force sensor bracket 423 to move. The second force sensor bracket 423 drives the simulation finger 41 to press the unlocking button 93 of the lock head 9 through the second force sensor 422. After the lock head 9 is unlocked, the lock tongue 23 pops out. As a preferred embodiment, a displacement sensor for the simulation finger 41 is provided at the bottom of the second driving bracket 43, and a displacement sensor for the lock tongue 23 is provided at the bottom of the first driving bracket 22. The displacement sensor for the simulation finger 41 is used to detect the displacement distance of the simulation finger 41. The displacement sensor for the lock tongue 23 is used to detect the displacement distance of the lock tongue 23. First limiting structures 4323 are provided at both ends of the first driving bracket 22, and a second limiting structure 4323 is provided at one end of the second driving bracket 43 close to the lock head 9. The first limit is two, which are respectively arranged at the front and rear ends of the first driving bracket 22. The front and rear ends refer to the two ends along the direction of the first guide rail 1, close to the lock head 9 and far from the lock head 9. It can also be arranged at other positions as long as it can limit the excessive forward and backward movement of the first driving bracket 22 along the first guide rail 1, so that it can apply sufficient insertion and extraction force and pre-tightening force to the lock tongue 23 without interfering with the movement of the simulation unlocking mechanism 4. The second limiting member is arranged at one end of the simulation unlocking mechanism 4 close to the lock head 9 to limit the excessive pressing of the simulation finger 41 and damage the lock head 9.

[0045] As an alternative embodiment, a protective plate 83 is provided outside the bottom plate 8 for protecting the plugging and unplugging mechanism and the unlocking mechanism.

[0046] Specifically, the base plate 8 includes a first base 81 and a second base 82. The first guide rail 1, the plugging and unplugging mechanism, and the unlocking mechanism are installed on the second base 82. The second base 82 is installed on the first base 81. The lock head 9 positioning mechanism 6 and the lock head 9 pressing mechanism 7 are installed on the first base 81. The lock head 9 positioning mechanism 6 is located on one side of the first base 81. The lock head 9 pressing mechanism 7 straddles the second base 82, that is, its two legs 711 are arranged on opposite sides of the second base 82. A protective plate 83 is provided outside the second base 82. The protective plate 83 is enclosed on all sides and only has an opening on the side close to the lock head 9 positioning mechanism 6, facilitating the plugging and unplugging of the lock tongue 23 by the plugging and unplugging mechanism 2 and the simulation unlocking mechanism 4.

[0047] Compared with the prior art, a lock head locking force detection device for an automotive seat belt tongue and lock head according to the present invention can fix the lock head of the seat belt, and is provided with a plugging and unplugging mechanism for fixing the lock tongue. A force sensor is provided on the plugging and unplugging mechanism, which can slowly insert the lock tongue into the lock head and detect the insertion force during insertion, and is provided with an unlocking mechanism having a force sensor, which can drive a simulation finger to press the unlocking button on the lock head and detect the unlocking force during unlocking. By detecting whether the insertion force and the unlocking force are compliant, it can be determined whether the lock head is qualified. The insertion mechanism and the unlocking mechanism are driven by a servo mechanism. By providing a servo mechanism that is more sensitive to displacement changes, the change speed of the pulling force and the pressure of the servo mechanism slows down, making the synchronization of the signals of the force sensor and the locking sensor better, and the detection of the locking force and the unlocking force more accurate.

[0048] The present invention also provides a method for detecting the locking force of an automotive seat belt tongue and lock head, which is used to implement a lock head locking force detection device for an automotive seat belt tongue and lock head as described in any one of the above, including:

[0049] S1: Install the lock head 9 on the lock head 9 positioning mechanism 6, connect the sensor wire harness 92 of the lock head 9 to the lock head 9 sensor socket assembly 622, and export the lock head 9 locking sensor signal;

[0050] S2: The plugging and unplugging mechanism is activated to drive the lock tongue 23 close to the lock head 9;

[0051] S3: Detect the locking force of the lock tongue 23 and determine whether the locking force meets the standard;

[0052] S4: If the locking force does not meet the standard, stop the detection. If it meets the standard, the plugging and unplugging mechanism reverses to apply an unlocking pre-tightening force to the lock tongue 23;

[0053] S5: The unlocking mechanism is activated to press the unlocking button 93 on the lock head 9 to unlock the lock head 9;

[0054] S6: Detect the unlocking force of the unlocking button press and determine whether the unlocking force meets the standard.

[0055] Specifically, install the lock head 9 on the lock head 9 positioning mechanism 6, including manually placing the lock head 9, plugging in the sensor plug, and the compression cylinder 721 automatically extending to press the lock head 9 tightly. During this process, the sensor continuously detects whether the lock head 9 is locked.

[0056] After the plugging and unplugging mechanism detects that the lock head 9 is fixed, the first servo motor 351 rotates to drive the lock tongue 23 close to the lock head 9 until the lock tongue 23 contacts the lock head 9. After the first force sensor 213 detects that the lock tongue 23 is stressed, the servo motor reduces its speed and the insertion speed of the lock tongue 23 slows down. The detection of the insertion force of the lock tongue 23 includes: increasing the insertion force of the lock tongue 23 in segments according to the set value until the locking sensor of the lock head 9 detects that the lock head 9 is locked. If the insertion force is qualified, proceed to the next step. Applying the unlocking pre-tightening force to the lock tongue 23 includes: the first servo motor 351 rotates in reverse to apply the unlocking pre-tightening force to the lock tongue 23. At this time, the first force sensor 213 works. When it detects that the pre-tightening force reaches the set value, the first servo motor 351 stops rotating. Subsequently, the second servo motor 551 rotates forward to push the simulation finger 41 close to the lock head 9. The second force sensor 422 works to measure the unlocking force of the simulation finger 41.

[0057] As an alternative implementation, the detection of the insertion force of the lock tongue includes:

[0058] S301: Set the qualified value N1 for the detection of the insertion driving force;

[0059] S302: Divide the qualified value of the insertion driving force detection into 2n + 1 segments, with a difference of f1 (f1 ≤ N1 / n) for each segment, to obtain 2n + 1 set forces. The set forces for each segment are in turn: N1 - nf1... N1... N1 + nf1;

[0060] S303: Detect the insertion force F1 of the lock tongue. When it is detected that the insertion force F1 ≥ 0, reduce the insertion speed;

[0061] S304: Continue to detect the insertion force F1 of the lock tongue. When the insertion force F1 of the lock tongue reaches N1 - nf1, pause, and the locking sensor determines whether it is locked;

[0062] S305: If it is locked, the detection is completed, and the locking force F at this time is equal to the insertion force F1. If it is not locked, continue to insert at a low speed and pause when reaching the next set force, and the locking sensor determines whether it is locked;

[0063] S306: Repeat the above steps to obtain the locking force F of the lock head. If the locking sensor determines that the lock head and the lock tongue are locked when F ≤ N1, the locking force meets the standard and the lock head is qualified. If the locking is not successful, it is determined that the lock head is unqualified.

[0064] Specifically, when the locking sensor is connected, it indicates that the lock tongue and the lock head are locked. When the first force sensor detects the force on the lock tongue, the servo motor reduces its speed, and the insertion speed of the lock tongue slows down. The pressure increases slowly to prevent errors in the detection of the locking force caused by the delay of the locking force sensor due to too rapid pressure changes.

[0065] As an alternative implementation, the detection of the unlocking force for pressing includes:

[0066] S601: Set the unlocking pre-tightening force N2, the maximum qualified value F2max for the pulling force detection, and the minimum qualified value F2min for the pulling force detection;

[0067] S602: Apply an initial pulling force f less than F2 min (f < F2 min), and determine whether the lock tongue pops out. If it pops out, stop the detection;

[0068] S603: Divide the qualified value of the unlocking driving force into m segments, with a difference of f2 between each segment (f2 = (F2max - f) / m);

[0069] S604: Starting from F2 = f, apply the pulling force F2 in segments and detect whether the lock tongue pops out. If it pops out, stop the detection, and at this time the unlocking force F' = F2. If it does not pop out, apply the next segment of the pulling force and continue the detection;

[0070] S605: If F2 min ≤ F' ≤ F2 max, the unlocking force meets the standard and the lock head is qualified.

[0071] Specifically, when the locking sensor is disconnected, it indicates that the lock tongue pops out.

[0072] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0073] This application is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for realizing the functions specified in one or more flows and / or one or more blocks in the flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or means for realizing the functions specified in one or more blocks.

[0074] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that realize the functions specified in one or more flows and / or one or more blocks in the flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or means for realizing the functions specified in one or more blocks.

[0075] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for realizing the functions specified in one or more flows and / or one or more blocks in the flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or means for realizing the functions specified in one or more blocks.

[0076] The foregoing description of specific exemplary embodiments of the present invention is for the purposes of illustration and exemplification. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is obvious that many changes and variations are possible in light of the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical applications, so that those skilled in the art can implement and utilize various different exemplary embodiments of the present invention, as well as various different selections and changes. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A detecting device for the locking force of a tongue and a buckle of an automobile seat belt, characterized in that, Comprising: A lock head positioning mechanism for positioning the lock head and outputting a locking sensor signal of the lock head; A lock head pressing mechanism for cooperating with the lock head positioning mechanism to press the lock head within the lock head positioning mechanism; A first guide rail; A plugging and unplugging mechanism including a lock tongue plugging and unplugging mechanism and a plugging and unplugging mechanism driver. The lock tongue plugging and unplugging mechanism is slidably mounted on the first guide rail. The lock tongue plugging and unplugging mechanism is used for assembling the lock tongue, applying an insertion force to the lock tongue through sliding to insert the lock tongue into the lock head and detecting the insertion force, and applying an unlocking pre-tightening force to the lock tongue during unlocking. The plugging and unplugging mechanism driver is used for providing a driving force for the sliding of the lock tongue plugging and unplugging mechanism; An unlocking mechanism including a simulation unlocking mechanism and an unlocking mechanism driver. The simulation unlocking mechanism is slidably mounted on the first guide rail. The simulation unlocking mechanism includes a simulation finger. The simulation unlocking mechanism can drive the simulation finger to apply an unlocking force to the unlocking button of the lock head through sliding and detect the unlocking force. The unlocking mechanism driver is used for providing a driving force for the sliding of the simulation unlocking mechanism; A bottom plate for mounting the lock head positioning mechanism, the lock head pressing mechanism, the plugging and unplugging mechanism, and the unlocking mechanism.

2. The locking force detection device for the tongue and head of an automotive seat belt according to claim 1, wherein The lock head pressing mechanism includes: A frame and a pressing mechanism body, and the pressing mechanism body is mounted on the frame; The frame includes two symmetrically arranged legs and a cross frame for connecting the legs, and the pressing mechanism body is arranged on the cross frame; The pressing mechanism body includes a cylinder, a telescopic rod, and a pressing block. The pressing block is fixed to one end of the telescopic rod, and the cylinder is connected to the other end of the telescopic rod for driving the telescopic rod to extend and retract.

3. The locking force detection device for the tongue and lock head of an automotive seat belt according to claim 1, characterized in that, The lock head positioning mechanism includes: A lock head positioning component including a clamping groove, and the shape of the clamping groove matches that of the lock head for clamping the lock head; A lock head secondary support component including a support portion and a lock head sensor socket component. The top surface of the support portion is flat for supporting the connection structure at the rear end of the lock head, and the lock head sensor socket component can match the sensor wire harness on the lock head.

4. The locking force detection device for the tongue and head of an automotive seat belt according to claim 3, wherein, The lock head sensor socket component includes a signal output module, and the signal output module can receive the signal input by the sensor wire harness and export the sensor signal to the control system of the detection device.

5. The locking force detection device for the tongue and buckle of an automotive seat belt according to claim 1, characterized in that, The plugging and unplugging mechanism driver includes: The first load bearing includes a first one-way load bearing assembly and a first two-way load bearing assembly arranged in parallel; a second guide rail, which is arranged between the first one-way load bearing assembly and the first two-way load bearing assembly; a first lead screw, one end of the first lead screw is rotatably fixed on the first one-way load bearing assembly, and the other end is rotatably fixed on the first two-way load bearing assembly; a first motor, the first motor includes a first servo motor and a first motor base, the first motor base is used to mount the first servo motor, the first servo motor is connected to the other end of the first lead screw through a first coupling, and the first motor is used to control the movement of the first lead screw; a first driving block, the first driving block includes a first terminal and a second terminal, the terminals are mounted on the first lead screw and can move along with the movement of the first lead screw, the first terminal and the first lead screw are connected by a first ball nut, the first ball nut includes a first internal thread hole and a first flange surface, a first guide rail slider is provided at the bottom of the first terminal, and the first guide rail slider can slide on the second guide rail; the second terminal is slidably connected to the lock tongue insertion and extraction mechanism, and the movement of the second terminal can be driven by the movement of the first terminal; The lock tongue insertion and extraction mechanism includes: A lock tongue bracket, including a lock tongue bracket body, a second guide rail slider, a first force sensor, and a second guide rail of the first force sensor, the second guide rail is arranged between the first one-way load bearing assembly and the first two-way load bearing assembly; a first lead screw, the first driving block and the first lead screw are connected by a first ball nut, the first ball nut includes a first internal thread hole and a first flange surface, one end of the first lead screw is rotatably fixed on the first one-way load bearing assembly, and the other end is rotatably fixed on the first two-way load bearing assembly; a first motor, the first motor includes a first servo motor and a first motor base, the first motor base is used to mount the first servo motor, the first servo motor is connected to the other end of the first lead screw through a first coupling, and the first motor is used to control the movement of the first lead screw; a first driving block, the first driving block includes a first terminal and a second terminal, which are connected through the connecting plate, the connecting plate is perpendicular to the first cross plate and the second cross plate, and the connecting plate can be fixed on the second guide rail slider to realize the linkage between the lock tongue bracket and the first driving bracket; the first driving member includes a first guide post, a first lock tongue spring, and a second lock tongue spring, the first guide post is arranged between the first cross plate and the second cross plate, one end of the second terminal is slidably connected to the first guide post, the first lock tongue spring is arranged outside the first guide post between the first cross plate and the second terminal, and the second lock tongue spring is arranged outside the first guide post between the second cross plate and the second terminal.

6. The lock force detection device for the tongue and buckle of an automobile seat belt according to claim 1, characterized in that, The unlocking mechanism drive includes: The second load bearing includes a second one-way load bearing assembly and a second two-way load bearing assembly arranged in parallel; a third guide rail, which is arranged between the second one-way load bearing assembly and the second two-way load bearing assembly; a second lead screw, the second drive block and the second lead screw are connected by a second ball nut, the second ball nut includes a second internal thread hole and a second flange surface, one end of the second lead screw is rotatably fixed on the second one-way load bearing assembly, and the other end is rotatably fixed on the second two-way load bearing assembly; a second motor, the second motor includes a second servo motor and a second motor base, the second motor base is used to mount the second servo motor, the second servo motor is connected to the other end of the second lead screw through a second coupling, and the second motor is used to control the movement of the second lead screw; a second drive block, the second drive block includes a third terminal and a fourth terminal, the third terminal is mounted on the second lead screw and can move along with the movement of the second lead screw, the third terminal and the second lead screw are connected by a second ball nut, the second ball nut includes a second internal thread hole and a second flange surface, a third guide rail slider is provided at the bottom of the third terminal, and the third guide rail slider can slide on the third guide rail; the fourth terminal is slidably connected to the simulation unlocking mechanism, and the movement of the fourth terminal can be driven by the movement of the third terminal; The simulation unlocking mechanism includes: a simulation finger bracket, a fourth guide rail slider, a second force sensor, and a second force sensor bracket, the simulation finger is mounted at one end of the second force sensor, the other end of the second force sensor is mounted on the second force sensor bracket, the second force sensor is used to measure the force on the simulation finger, the fourth guide rail slider is slidably connected to the first guide rail, and the second force sensor bracket is fixed on the fourth guide rail slider; a second drive bracket, including a second drive bracket body and a second drive member, the second drive member includes a second guide post and an unlocking drive spring arranged outside the second guide post, the second drive bracket body is fixed on the fourth guide rail slider, and the second drive bracket body is fixedly connected to one end of the second guide post, one end of the guide post is fixedly connected, a limit structure is provided at the end of the other end of the second guide post, the limit structure is used to limit the outward displacement of the fourth terminal, the fourth terminal is slidably connected to the second guide post, and the unlocking drive spring is located between the fourth terminal and the second drive bracket body.

7. The locking force detection device for the tongue and buckle of an automobile seat belt according to claim 1, wherein A protective plate is provided outside the bottom plate for protecting the plugging and unplugging mechanism and the unlocking mechanism.

8. A method for detecting the locking force of a seat belt tongue and buckle of an automobile, which is used to implement a device for detecting the locking force of a seat belt tongue and buckle of an automobile according to any one of claims 1-7, characterized in that, Including: S1: Install the lock head on the lock head positioning mechanism, connect the sensor wire harness of the lock head to the lock head sensor socket assembly, and export the lock head locking sensor signal; S2: The plugging and unplugging mechanism is started to drive the lock tongue close to the lock head; S3: Detect the locking force of the lock tongue and judge whether the locking force meets the standard; S4: If the locking force does not meet the standard, stop the detection. If it meets the standard, the insertion and extraction mechanism rotates in reverse to apply an unlocking pre-tightening force to the locking tongue. S5: The unlocking mechanism is activated to press the unlocking button on the lock head to unlock the lock head. S6: Detect the unlocking force of pressing the unlocking button and determine whether the unlocking force meets the standard.

9. The method for detecting the locking force of a seat belt tongue and buckle of an automobile according to claim 8, wherein The detection of the locking force of the locking tongue and the determination of whether the locking force meets the standard include: S301: Set the qualified value N1 of the insertion driving force detection. S302: Divide the qualified value of the insertion driving force detection into 2n + 1 segments, with a difference of f1 (f1 ≤ N1 / n) for each segment, to obtain 2n + 1 set forces. The set forces for each segment are in turn: N1 - nf1... N1... N1 + nf1. S303: Detect the insertion force F1 of the locking tongue. When the detected insertion force F1 ≥ 0, reduce the insertion speed. S304: Continue to detect the insertion force F1 of the locking tongue. When the insertion force F1 of the locking tongue reaches N1 - nf1, pause, and the locking sensor determines whether it is locked. S305: If it is locked, complete the detection. At this time, the locking force F is equal to the insertion force F1. If it is not locked, continue to insert at a low speed and pause when reaching the next set force. The locking sensor determines whether it is locked. S306: Repeat the above steps to obtain the locking force F of the lock head. If when F ≤ N1, the locking sensor determines that the lock head and the locking tongue are locked, then the locking force meets the standard and the lock head is qualified. If the locking is not successful, it is determined that the lock head is unqualified.

10. A method for detecting the locking force of a seat belt tongue and buckle of an automobile according to claim 8, characterized in that, The detection of the unlocking force of pressing and the determination of whether the locking force meets the standard include: S601: Set the unlocking pre-tightening force N2, the maximum qualified value F2max of the pulling force detection, and the minimum qualified value F2min of the pulling force detection. S602: Apply an initial pulling force f less than F2min (f < F2min) and determine whether the locking tongue pops out. If it pops out, stop the detection. S603: Divide the qualified value of the unlocking driving force detection into m segments, with a difference of f2 (f2 = (F2max - f) / m) for each segment. S604: Starting from F2 = f, apply the pulling force F2 in segments and detect whether the locking tongue pops out. If it pops out, stop the detection. At this time, the unlocking force F' = F2. If it does not pop out, apply the next segment of the pulling force and continue the detection. S605: If F2min ≤ F' ≤ F2max, the unlocking force meets the standard and the lock head is qualified.

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