Automobile door handle strength test device and method

Abstract

The application discloses a kind of automobile door handle strength test device and method, it is related to automobile passive safety test field.Device includes rack assembly, lifting platform, horizontal linear guide, support seat, telescopic driving part, force sensing acquisition module, fixture assembly, mechanical arm and tangent calibration mechanism;Fixture assembly contains fixed seat, movable seat, movable seat is hingedly arranged, and adjustable clamping component is configured;Tangent calibration mechanism is set with the first laser emission component, second laser emission component coaxial with lower pin shaft, and the tangent direction calibration of handle movement is completed with the cooperation of multiple groups of laser receiving ends on the tangent reference reference bar of the front end of mechanical arm, angle measurement component.The present application uses two-point tangent geometry positioning, can control the tangent angle between force direction and handle movement trajectory within ±5 °, meets GB 48001-2026 strength test requirement, and can directly carry out strength test to the door handle in the real vehicle assembly state.

Description

Technical Field

[0001] This invention relates to the field of automotive passive safety testing, and in particular to a testing device and method for automotive door handle strength under actual vehicle assembly conditions. Background Technology

[0002] According to the national standard GB 48001-2026 "Safety Technical Requirements for Automobile Door Handles", the strength test of the inner and outer handles of automobile doors has clear requirements: the handle must be opened to the limit position, and a specified load must be applied within ±5° along the tangent of the handle's movement trajectory and maintained; the force applied to the outer handle shall not be less than 500N, and the force applied to the ordinary inner handle shall not be less than 200N.

[0003] Most existing door handle strength testing equipment is component-level bench testing, which can only test individually disassembled handle samples and cannot perform load testing on the entire assembled door, resulting in significant differences from the stress conditions of a real vehicle. Furthermore, existing equipment lacks a quick-change adaptation structure for inner and outer handles, limiting its applicability.

[0004] Traditional equipment relies on manual visual inspection to determine the tangent direction at the handle's limit position, resulting in poor angle control accuracy and difficulty in consistently meeting the national standard's ±5° angle tolerance requirement. Furthermore, the methods for adjusting the loading angle and loading center position are limited, lacking a high-precision positioning and calibration mechanism. The function of synchronously triggering force value acquisition with external high-speed cameras is also missing, leading to insufficient traceability of test data.

[0005] Some existing solutions attempt to use external coordinate measuring machines (CMMs) or external line projectors to obtain the tangential direction of handle movement. However, these external measuring instruments are bulky, while the installation space around the vehicle door is limited, making instrument placement difficult. Furthermore, the external instruments and loading fixtures are independent of each other, requiring realignment of the loading fixture after calibration, resulting in a cumbersome process and potential transmission errors between the calibration and loading references. In addition, external measurement solutions cannot be integrated into the loading actuator, making it difficult to monitor the force angle deviation in real time during loading. Summary of the Invention

[0006] The purpose of this invention is to provide an automotive door handle strength testing device and method to solve the above problems. It can directly conduct strength tests on door handles assembled on actual vehicle doors; it is compatible with both internal and external door handles; it can accurately calibrate the tangential direction of the handle's extreme position, so that the direction of force application meets the national standard ±5° accuracy requirement; it can achieve stable loading, automatic recording of test data, and can be linked with external acquisition devices to synchronously acquire test images.

[0007] The above-mentioned objective of the present invention is achieved through the following technical solution: A vehicle door handle strength testing device includes: The frame assembly forms the load-bearing base of the entire machine, and the frame assembly is equipped with vertical lifting guide rails; The lifting platform is installed on the vertical lifting guide rail and can move vertically along the vertical lifting guide rail; A horizontal linear guide rail is installed on the lifting platform; The support base is provided on the track slider of the horizontal linear guide rail, and can move horizontally along the horizontal linear guide rail and rotate relative to the horizontal linear guide rail. A telescopic drive component is mounted on the support base, and the front end of the telescopic drive component is connected to a clamp assembly via a force sensing acquisition module for acquiring the loading force value. The clamp assembly includes a fixed seat and a movable seat. The movable seat is hinged to the fixed seat by a pin. The movable seat is provided with an adjustable clamping component for clamping the door handle.

[0008] The frame assembly forms the load-bearing base of the entire machine, and is equipped with vertical lifting guide rails. The bottom of the frame assembly is equipped with leveling support feet, allowing the frame assembly to move as a whole and remain stable during testing. The frame assembly also includes a lifting platform. Preferably, the testing apparatus also includes a robotic arm and a tangent calibration mechanism. The robotic arm is mounted on the lifting platform. A tangent reference rod is hinged to the front end of the robotic arm. The tangent reference rod is equipped with a central laser receiver, a strip-shaped signal receiver, and a tangent laser receiver. The tangent calibration mechanism includes a first laser emitting component, an angle measuring component, and a second laser emitting component. The first laser emitting component is disposed below the lower pin of the fixture assembly, which connects the fixed seat and the movable seat. The laser emitting center of the first laser emitting component is coaxially arranged with the lower pin. The angle measuring component is disposed on the fixture assembly and includes an angle ruler, an angle reference rod, an upper pin, and an angle vernier scale. The angle ruler is disposed on the angle reference rod, and the upper pin is coaxially arranged with the lower pin. The angle ruler can rotate around the upper pin with the angle reference rod and rotate relative to the fixed seat. The second laser emitting component is disposed at the front end of the angle reference rod and is used to emit laser light to the tangent laser receiving end on the tangent reference rod. The 90° position direction of the angle ruler is perpendicular to the length direction of the angle reference rod.

[0009] Preferably, the central laser receiver and the elongated signal receiver are located at the hinged end of the tangential reference rod, the tangential laser receiver is located at the free end of the tangential reference rod, and the length directions of the elongated signal receiver and the tangential laser receiver are perpendicular to each other; the angle reference rod and the angle vernier scale are respectively located on the fixed base.

[0010] Preferably, the fixed seat is a frame structure with an open front end, and the movable seat is a frame structure with an open front end, the top and bottom of the front end of which are respectively hinged to the top and bottom of the front end of the fixed seat; the clamping assembly includes a locking block that can slide along the bottom and top frame edges of the movable seat and a pin located at the open end of the movable seat to seal the open end of the movable seat; a clamping space for clamping the handle is formed between the pin and the locking block, and a locking bolt that passes through the movable seat is provided at the rear end of the locking block.

[0011] Preferably, the telescopic drive component is a lead screw that passes through the support base, and the front end of the lead screw is connected to the force sensing acquisition module through a coupling. The front end of the force sensing acquisition module is connected to the rear end of the fixed base.

[0012] The telescopic drive component is a lead screw, but other components capable of linear telescopic drive, such as electric cylinders or hydraulic cylinders, can also be used.

[0013] Preferably, the frame assembly is provided with lateral support rods, the ends of which are used to abut against the sheet metal of the actual vehicle door. The lateral support rods include at least two rods, which are located on both sides of the fixture assembly. The force sensor built into the force sensing acquisition module has a sampling rate of not less than 100Hz. The force sensing acquisition module is provided with a data storage output unit and a synchronous trigger interface for automatically recording and exporting force-time curves, and the synchronous trigger interface is used to output trigger signals to external high-speed camera equipment.

[0014] Preferably, the lifting platform is provided with two horizontal linear guide rails that are spaced apart vertically and arranged horizontally. Each horizontal linear guide rail has an L-shaped connecting plate on its track slider, and the two connecting plates are arranged symmetrically vertically. The track slider is mounted on the two connecting plates at its upper and lower ends via bearings and a connecting shaft and can rotate on the horizontal plane. The lead screw passes horizontally through the support base, and the axis of the lead screw intersects the axis of the connecting shaft perpendicularly in space.

[0015] Preferably, the system also includes a lifting platform and a lifting screw mounted on the frame assembly, the lifting screw passing through the lifting platform vertically, the upper end of the lifting screw being connected to the lifting platform; it also includes a locking guide rail assembly mounted on the horizontal linear guide rail.

[0016] A method for testing the strength of a car door handle, using the aforementioned car door handle strength testing device, includes the following steps: S1. Device positioning: Move the frame assembly to the side of the actual vehicle door and adjust the position of the frame; press the inner or outer surface of the door with the lateral support rod; rotate the lifting screw to adjust the height of the lifting platform so that the clamp assembly is level with the door handle. S2. Tooling Alignment: Based on the type of handle to be tested, place the door handle in the clamping space of the fixture assembly, adjust the locking block, pin and locking bolt to complete the handle clamping and positioning, and lock the fixture assembly. S3. Tangential Direction Calibration: Loosen the locking guide rail assembly, pull the door handle to the opening limit position and hold the position; activate the first laser emitting assembly, swing the robotic arm so that the central laser receiving end on the tangential reference rod receives the laser, marking the first point of the handle tangential; control the handle to retract slightly, the laser emitted by the first laser emitting assembly deviates from the original position, rotate the tangential reference rod so that the long strip signal receiving end receives the laser, thereby determining the second point of the handle tangential; the line connecting the two points is the length direction of the long strip signal receiving end, which is the tangential direction of the handle's movement when it is in the limit position; S4. Angle Zero-Position Reference Calibration: Reset the handle to its limit position; activate the second laser emitting component, adjust the angle reference rod so that the tangential laser receiving end receives the laser signal from the second laser emitting component, and complete the zero-position reference calibration of the angle ruler, i.e., the zero-position reference calibration of the applied force angle; adjust the telescopic drive component so that the support base slides along the horizontal linear guide rail, thereby rotating the angle of the fixed base, so that the angle vernier scale on the top of the fixed base is aligned with the 90° position in the middle of the angle ruler, that is, at this time the angle vernier scale points to the tangential direction of the movement trajectory when the handle reaches the limit position, and then fix the support base to fix the position of the fixed base.

[0017] S5. Loading and Holding: The operating screw applies a specified load along the tangential direction of the handle's movement at its limit position and holds the load for a set duration; the force sensor acquisition module acquires the force value in real time and simultaneously triggers a high-speed camera to acquire test images. S6. End of test: Unload the load, release the handle, and export the force-time test data.

[0018] When testing the exterior door handle, the device can be placed directly on the exterior of the door and operated according to the steps above. When testing the interior door handle, the door can be opened and secured, and then the device can be moved to a suitable position for testing in the same manner.

[0019] The entire calibration mechanism is integrated into the loading fixture, eliminating the need for external coordinate measuring machines and line projectors. Relying on the coaxial structure of the lower and upper pins, the calibration reference and loading reference are of the same origin, eliminating reference transmission errors caused by external equipment. Specifically, the central laser receiver is used to locate the first trajectory point at the handle's extreme position; the elongated signal receiver is used to fit the line connecting two points to determine the tangent direction; and the tangent laser receiver is used to receive signals from the second laser emitting component, completing the transmission of the angle reference and zero-position calibration.

[0020] Unlike solutions that use external coordinate measuring machines or external line projectors, the tangent calibration mechanism of this invention is integrated into the tooling assembly. The first laser emitting component is strictly coaxial with the lower pin of the fixture. Relying on the robotic arm to drive the tangent reference rod, the central laser receiving end, the long strip signal receiving end, and the tangent laser receiving end work in conjunction with the first and second sets of laser emitting components to complete the two-point marking of the trajectory, tangent fitting, and zero-angle transfer. The entire geometric transfer link does not require external large measuring instruments, is suitable for the narrow installation space of the actual vehicle door, and the calibration reference and loading reference are from the same source, avoiding the alignment transfer error of external instruments.

[0021] Beneficial effects of this invention: 1. This device can directly conduct strength tests on door handles assembled on actual vehicle doors without disassembling the handles from the doors, thus realistically replicating the assembly conditions of the entire vehicle and solving the problem of inconsistent stress between traditional bench tests and actual vehicles.

[0022] 2. An optomechanical integrated calibration mechanism with dual laser emitting components and multiple receivers is adopted; the first laser emitting component is coaxially arranged with the lower pin of the fixture, and the tangent of the handle's extreme position is obtained by fitting the trajectory points of the two points; the entire calibration mechanism is integrated on the loading fixture side, eliminating the need for external coordinate measuring machines or projection instruments and other large measuring equipment, making it suitable for the narrow installation space around the car door; the calibration reference and the loading reference are from the same source, avoiding the reference transmission error that exists in external measurement schemes, and the force application angle deviation can be stably controlled within ±5°, meeting the national standard's mandatory accuracy requirements. The calibration accuracy and ease of operation are superior to external measurement schemes.

[0023] 3. The fixture assembly adopts a frame-shaped opening and closing structure. The pin bar and sliding locking block form an adjustable clamping space, which can be adapted to various types of car door handles. The force sensing acquisition module collects force values ​​at a high sampling rate and has a synchronous trigger output interface to realize the synchronous recording of force-time data and high-speed camera images, and the test process can be completely traced. The whole machine is movable, and the lateral support top rod ensures the stability of the equipment and the car door in the loading state. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this application and the car door. Figure 1 ; Figure 2 This is a schematic diagram of the device structure; Figure 3 Partial structural diagram of this application Figure 1 ; Figure 4 This is a partial structural diagram of this application. Figure 2 ; Figure 5 This is a partial structural diagram of this application. Figure 3 ; Figure 6This is a schematic diagram of the tangent reference rod structure; Figure 7 This is a schematic diagram of the structure of this application and the car door. Figure 2 ; Figure 8 This is a schematic diagram of the cooperation structure between the slider and the horizontal linear guide rail; Figure 9 This is a schematic diagram of the fixture assembly structure. Figure 1 ; Figure 10 This is a schematic diagram of the fixture assembly structure. Figure 2 ; Figure 11 This is a schematic diagram after the tangent directions of this application are aligned. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings.

[0026] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0027] Example 1:

[0028] A vehicle door handle strength testing device includes a frame assembly 1, a lifting platform 2, a horizontal linear guide rail 3, a track slider 31, an L-shaped connecting plate 32, a connecting shaft 34, a support base 4, a lead screw 5, a fixture assembly 7, a robotic arm 9, a tangent calibration mechanism 10, a force sensing acquisition module 11, a lateral support rod 12, a locking guide rail assembly 15, a lifting platform 16, and a lifting lead screw 17.

[0029] The frame assembly 1 is a welded steel frame with leveling support feet at the bottom, allowing the machine to move and maintain stability during testing. The frame assembly 1 has a vertical lifting guide rail 03, and the lifting platform 16 is fixed to it. A lifting screw 17 passes vertically through the lifting platform 16, with its upper end connected to the lifting platform 2. Rotating the lifting screw 17 drives the lifting platform 2 to move up and down along the vertical lifting guide rail, aligning the clamp assembly 7 with the door handle 8.

[0030] The lifting platform 2 is equipped with two horizontally spaced linear guide rails 3. Each linear guide rail 3 is equipped with a track slider 31. Each track slider 31 on the linear guide rail 3 has an L-shaped connecting plate 32, and the two connecting plates 32 are symmetrically arranged vertically. The track slider 31 is mounted on the two connecting plates 32 at its upper and lower ends via bearings and connecting shafts 34, and can rotate on the horizontal plane. The support base 4 is mounted on the track slider 31, can move horizontally along the linear guide rail 3, and can rotate relative to the linear guide rail 3 on the horizontal plane. The linear guide rail 3 is equipped with a locking guide rail assembly 15. The locking guide rail assembly in this application can be a positioning bolt 151 that directly penetrates the front end of the connecting plate turntable slider and abuts against the horizontal linear guide rail, or a positioning block 152 and positioning block bolt 153 that are movably mounted on the lifting platform on both sides of the track slider. When it is necessary to fix the support seat, the positioning bolt can be tightened or the positioning block on the required side can be moved to the track slider side to abut against and the positioning block bolt can be tightened to position the support seat on the horizontal linear guide rail.

[0031] A lead screw 5 is mounted on the support base 4 as a telescopic drive component. The lead screw 5 passes laterally through the support base 4, and its axis intersects perpendicularly with the axis of the connecting shaft 34 in space. The front end of the lead screw 5 is connected to the force sensing acquisition module 11 via a coupling, and the front end of the force sensing acquisition module 11 is connected to the rear end of the fixing seat 71 of the clamp assembly 7.

[0032] The clamp assembly 7 consists of a fixed base 71 and a movable base 72. The fixed base 71 is a frame structure with an open front end, and the movable base 72 is a frame structure with an open front end, whose top and bottom ends are respectively hinged to the top and bottom ends of the fixed base 71. The movable base 72 is hinged to the fixed base 71 via an upper pin 1023 and a lower pin 75. The clamping assembly includes a locking block 721, a pin 73, and a locking bolt 74. The locking block 721 can slide along the bottom and top frame edges of the movable base 72, and the pin 73 is located at the open end of the movable base 72, which can seal the open end of the movable base 72. A clamping space for clamping the door handle 8 is formed between the pin 73 and the locking block 721. The locking block 721 has a locking bolt 74 that passes through the movable base 72 at its rear end. When clamping, place the door handle 8 in the clamping space, adjust the position of the locking block 721, insert the pin 73 to seal the opening, and tighten the locking bolt 74 to clamp and position the handle.

[0033] The robotic arm 9 is mounted on the lifting platform 2 and is independently configured from the fixture assembly 7. A tangent reference rod 91 is hinged to the front end of the robotic arm 9. The hinged end of the tangent reference rod 91 is equipped with a central laser receiver 94 and a strip-shaped signal receiver 92, while the free end is equipped with a tangent laser receiver 93. The length directions of the strip-shaped signal receiver 92 and the tangent laser receiver 93 are perpendicular to each other. The robotic arm 9 can swing, moving the tangent reference rod 91 to a suitable position so that its laser receiver can receive laser signals from the direction of the fixture assembly 7. In this embodiment, a two-axis robotic arm can be used.

[0034] The tangent calibration mechanism 10 includes a first laser emitting component 101, an angle measuring component 102, and a second laser emitting component 103. The first laser emitting component 101 is located below the lower pin 75 of the fixture assembly 7. The upper and lower pins 75 are used to connect the fixed seat 71 and the movable seat 72. The laser emission center of the first laser emitting component 101 is coaxially arranged with the lower pin 75, ensuring that the laser emission center and the handle rotation center are geometrically homologous.

[0035] Angle measuring component 102 is mounted on the fixed base 71 of the fixture assembly 7, specifically on the top of the fixed base. The angle measuring component 102 includes an angle gauge 1021, an angle reference rod 1022, an upper pin 1023, and an angle vernier caliper 1024. The upper pin 1023 is coaxially arranged with the lower pin 75 to ensure that the angle transmission reference is consistent with the handle rotation reference. The angle gauge 1021 is mounted on the angle reference rod 1022 and can rotate with the angle reference rod 1022 around the upper pin 1023 and relative to the fixed base 71. The angle reference rod 1022 and the angle vernier caliper 1024 are respectively mounted on the fixed base 71. The 90° position direction of the angle gauge 1021 is perpendicular to the length direction of the angle reference rod 1022.

[0036] The second laser emitting component 103 is disposed at the front end of the angle reference rod 1022 and rotates together with the angle reference rod 1022 around the upper pin 1023. The second laser emitting component 103 is used to emit laser light to the tangential laser receiving end 93 at the free end of the tangential reference rod 91. When the tangential laser receiving end 93 receives the laser signal emitted by the second laser emitting component 103, the angle ruler 1021 reaches the required position, and the 90° scale direction of the angle ruler 1021 corresponds to the calibrated tangential direction of the handle.

[0037] Lateral support rods 12 are mounted on the frame assembly 1. There are at least two lateral support rods 12, located on both sides of the fixture assembly 7. During testing, the frame is pushed next to the actual vehicle door 13, and the lateral support rods 12 extend to press against the sheet metal of the door 13 to counteract the loading reaction force and prevent the door from shaking and interfering with the force on the handle.

[0038] The force sensing acquisition module 11 is located between the lead screw 5 and the fixture assembly 7. Its built-in force sensor has a sampling rate of 100Hz, enabling real-time acquisition of the applied force value. The force sensing acquisition module 11 includes a storage unit and a BNC synchronous trigger output interface, which can automatically record force-time data and output a trigger signal to an external high-speed camera, achieving synchronous force value acquisition and image acquisition.

[0039] In this embodiment, the lead screw 5 is used as a telescopic drive component, and in actual operation, it is driven by manually rotating the lead screw handwheel. In other embodiments, the telescopic drive component can also be a drive component capable of outputting linear motion, such as an electric cylinder or a hydraulic cylinder.

[0040] Example 2:

[0041] A method for testing the strength of automobile door handles, the test operation steps are as follows: S1. Device Positioning: Move the frame assembly 1 to the side of the actual vehicle door 13. Adjust the position of the frame so that the clamp assembly 7 is close to the door handle 8. Secure the clamp to the inner or outer surface of the door using the lateral support rod 12. Rotate the lifting screw 17 to adjust the height of the lifting platform 2 so that the clamp assembly 7 is level with the door handle 8.

[0042] S2. Tooling Alignment: Based on the type of handle being tested, place the door handle 8 within the clamping space of the fixture assembly 7. Adjust the locking block 721 to slide along the bottom and top frame edges of the movable seat 72, pressing the handle firmly. Insert the pin 73 into the open end of the movable seat 72 to seal it. Tighten the locking bolt 74 to complete the handle clamping and positioning, and lock the fixture assembly 7.

[0043] S3. Tangential Direction Calibration: Loosen the locking guide rail assembly 15 to allow the support base 4 to move freely on the horizontal linear guide rail 3. Pull the door handle 8 to its opening limit position. At this time, since the horizontal linear guide rail 3 is in the loose state, the support base 4 will move adaptively with the movement of the door handle. When the handle reaches its limit position, lock the horizontal linear guide rail 3.

[0044] The first laser emitting component 101 is activated, and it emits a laser beam. The robotic arm 9 is swung so that the center laser receiving end 94 at the hinge end of the tangent reference rod 91 receives the laser signal. At this time, the laser emitting end is located below the pivot connecting the fixed end and the movable end of the clamp; this position is the first point of the handle tangent.

[0045] The control handle retracts slightly, and the laser emitted by the first laser emitting component 101 deviates from the original receiving position. The rotating tangent reference rod 91 causes the elongated signal receiving end 92 to receive the laser, thereby determining the second point of the handle tangent. The line connecting the two points is the length direction of the elongated signal receiving end 92, which is the direction of the tangent of the handle when it is in the extreme position.

[0046] S4. Angle Zero-Position Reference Calibration: Return the handle to its extreme position. Activate the second laser emitting assembly 103, which rotates together with the angle reference rod 1022. Adjust the angle reference rod 1022 so that the tangential laser receiving end 93 at the free end of the tangential reference rod 91 receives the laser signal from the second laser emitting assembly 103. When the tangential laser receiving end 93 receives the signal, the angle ruler 1021 reaches the required position, completing the zero-position reference calibration of the angle ruler 1021, i.e., the zero-position reference calibration of the applied force angle.

[0047] Adjust the telescopic drive component to make the support base 4 slide along the horizontal linear guide rail 3, thereby rotating the angle of the fixed base 71 so that the angle vernier scale 1024 at the top of the fixed base 71 is aligned with the 90° position in the middle of the angle scale 1021. That is, at this time, the angle vernier scale 1024 points to the tangent direction of the movement trajectory when the handle reaches the limit position. Then fix the support base 4 to fix the position of the fixed base 71.

[0048] S5. Load Holding: The operating screw 5 applies a specified load along the tangential direction of the handle's movement at its limit position and holds the load for a set duration. The force sensor acquisition module 11 acquires the force value in real time and simultaneously triggers a high-speed camera to acquire test images. During the test, the deviation between the applied force direction and the tangential direction of the handle's movement at its limit position is controlled to be within ±5°.

[0049] According to the standard requirements, when testing the external handle, a load of 500N is applied and held for 5 seconds; when testing the ordinary internal handle, a load of 200N is applied and held for 5 seconds; when testing the electronic button-type internal handle, a load of 50N is applied and held for 5 seconds.

[0050] S6. Test End: Unload the load and release the door handle 8. Export the stored force-time test data to complete one strength test.

[0051] This invention achieves precise location of the tangent direction at the extreme position of the door handle through a geometric positioning mechanism of "two-point tangent line determination + coaxial laser reference transmission".

[0052] The first laser emitting component 101 is coaxially arranged with the lower pin 75 of the fixture assembly 7, ensuring that the laser emission center and the actual rotation center of the handle are geometrically homologous. When the handle is pulled to the open limit position, the first laser emitting component 101 emits a laser, which is received by the central laser receiving end 94 at the hinge end of the tangent reference reference rod 91, marking the first point of the motion trajectory. The handle retracts slightly, obtaining the second trajectory point. The tangent reference reference rod 91 is rotated so that the elongated signal receiving end 92 receives the laser, thereby determining the second tangent point of the handle. The line connecting the two points is the length direction of the elongated signal receiving end 92, which is the tangent direction of the handle when it is in the limit position. Afterwards, the handle returns to the limit position, the second laser emitting component 103 is activated, and the angle reference rod 1022 is adjusted so that the tangent laser receiving end 93 receives the laser, completing the tangent zero-position calibration of the angle ruler 1021. When loading, read the offset of 1024 on the vernier caliper and apply force to the lead screw along the tangent direction of the handle's movement at the limit position, ensuring that the deviation between the applied force direction and the tangent direction is controlled within ±5°.

[0053] The entire calibration mechanism is integrated into the loading fixture, eliminating the need for external coordinate measuring machines and line projectors. Relying on the coaxial structure of the lower pin 75 and upper pin 1023, the calibration reference and loading reference are of the same origin, eliminating reference transmission errors caused by external equipment. Specifically, the central laser receiver 94 is used to locate the first trajectory point at the handle's extreme position; the elongated signal receiver 92 is used to fit the line connecting two points to determine the tangent direction; and the tangent laser receiver 93 is used to receive the signal from the second laser emitting component 103, completing the transmission of the angle reference and zero-position calibration.

[0054] Unlike solutions that use external coordinate measuring machines or external line projectors, the tangent calibration mechanism 10 of this invention is integrated into the tooling assembly. The first laser emitting component 101 is strictly coaxial with the lower pin 75 of the fixture. The robotic arm 9 drives the tangent reference rod 91, and the central laser receiving end 94, the long strip signal receiving end 92, and the tangent laser receiving end 93 work together with the first and second sets of laser emitting components to complete the two-point marking of the trajectory, tangent fitting, and zero-angle transfer. The entire geometric transfer link does not require external large measuring instruments, is suitable for the narrow installation space of the actual vehicle door 13, and the calibration reference and the loading reference are from the same source, avoiding the alignment transfer error of external instruments.

[0055] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A vehicle door handle strength testing device, characterized in that, include: The frame assembly (1) forms the load-bearing base of the whole machine, and the frame assembly (1) is provided with a vertical lifting guide rail (03). The lifting platform (2) is installed on the vertical lifting guide rail and can move vertically along the vertical lifting guide rail; A horizontal linear guide rail (3) is installed on the lifting platform (2); The support base (4) is located on the track slider (31) of the horizontal linear guide (3), and can move horizontally along the horizontal linear guide (3) and rotate relative to the horizontal linear guide. The telescopic drive is located on the support base (4), and the front end of the telescopic drive is connected to the clamp assembly (7) through the force sensing acquisition module (11) for acquiring the loading force value. The clamp assembly (7) includes a fixed seat (71) and a movable seat (72). The movable seat is hinged to the fixed seat by a pin. The movable seat is provided with an adjustable clamping component for clamping the door handle (8).

2. The automobile door handle strength testing device according to claim 1, characterized in that, The testing device also includes a robotic arm (9) and a tangent calibration mechanism (10). The robotic arm is mounted on the lifting platform (2). A tangent reference rod (91) is hinged to the front end of the robotic arm (9). The tangent reference rod (91) is provided with a central laser receiver (94), a strip-shaped signal receiver (92) and a tangent laser receiver (93). The tangent calibration mechanism (10) includes a first laser emitting component (101), an angle measuring component (102), and a second laser emitting component (103). The first laser emitting component (101) is disposed below the lower pin (75) of the clamp assembly (7) for connecting the fixed seat and the movable seat, and the laser emission center of the first laser emitting component (101) is coaxially disposed with the lower pin (75). The angle measuring component (102) is disposed on the clamp assembly (7) and includes an angle ruler (1021), an angle reference rod (1022), an upper pin (1023), and an angle vernier scale (1023). 1024); The angle ruler (1021) is mounted on the angle reference rod (1022), the upper pin (1023) and the lower pin (75) are coaxially arranged, the angle ruler (1021) can rotate with the angle reference rod (1022) around the upper pin (1023) and rotate relative to the fixed seat; the second laser emitting assembly (103) is mounted on the front end of the angle reference rod (1022) and is used to emit laser to the tangent laser receiving end (93) on the tangent reference rod (91), the 90° position direction of the angle ruler is perpendicular to the length direction of the angle reference rod.

3. The automobile door handle strength testing device according to claim 2, characterized in that, The central laser receiver and the elongated signal receiver (92) are located at the hinge end of the tangent reference rod (91), and the tangent laser receiver (93) is located at the free end of the tangent reference rod (91). The length directions of the elongated signal receiver (92) and the tangent laser receiver (93) are perpendicular to each other. The angle reference rod (1022) and the angle vernier caliper (1024) are respectively located on the fixed base (71).

4. The automobile door handle strength testing device according to claim 1, characterized in that, The fixed seat (71) is a frame structure with an open front end, and the movable seat (72) is a frame structure with an open front end, whose top and bottom ends are respectively hinged to the top and bottom ends of the fixed seat. The clamping assembly includes a locking block (721) that can slide along the bottom and top edges of the movable seat and a pin (73) located at the open end of the movable seat to seal the open end of the movable seat. A clamping space for clamping the handle is formed between the pin (73) and the locking block, and a locking bolt (74) is provided at the rear end of the locking block and passes through the movable seat.

5. The automobile door handle strength testing device according to claim 1, characterized in that, The telescopic drive component is a lead screw (5) that passes through the support base (4). The front end of the lead screw is connected to the force sensing acquisition module (11) through a coupling. The front end of the force sensing acquisition module (11) is connected to the rear end of the fixed base (71).

6. The automobile door handle strength testing device according to claim 1, characterized in that, The frame assembly (1) is provided with a lateral support rod (12), the end of which is used to abut against the sheet metal of the actual vehicle door (13). The lateral support rod includes at least two rods, which are located on both sides of the fixture assembly. The force sensor built into the force sensing acquisition module (11) has a sampling rate of not less than 100Hz. The force sensing acquisition module (11) is provided with a data storage output unit and a synchronous trigger interface. The synchronous trigger interface is used to output a trigger signal to an external high-speed camera device.

7. The automobile door handle strength testing device according to claim 4, characterized in that, The lifting platform (2) is provided with two horizontal linear guide rails (3) spaced vertically and horizontally arranged. Each horizontal linear guide rail has an L-shaped connecting plate (32) on its track slider (31). The two connecting plates are symmetrically arranged vertically. The track slider is mounted on the two connecting plates at its upper and lower ends via bearings and connecting shaft (34) and can rotate on the horizontal plane. The lead screw (5) is horizontally inserted on the support base (4), and the axis of the lead screw intersects the axis of the connecting shaft (34) perpendicularly in space.

8. The automobile door handle strength testing device according to claim 1, characterized in that, It also includes a lifting platform (16) and a lifting screw (17) mounted on the frame assembly. The lifting screw passes through the lifting platform from top to bottom, and the upper end of the lifting screw is connected to the lifting platform (2). It also includes a locking guide rail assembly (15), which is mounted on the horizontal linear guide rail (3).

9. A method for testing the strength of a car door handle, characterized in that, The automobile door handle strength testing device according to any one of claims 1 to 8 comprises the following steps: S1. Device in place: Move the frame assembly (1) to the side of the actual vehicle door (13) and adjust the position of the frame; press the inner or outer surface of the door with the side support rod (12); rotate the lifting screw (17) to adjust the height of the lifting platform (2) so that the clamp assembly (7) is level with the door handle (8); S2. Tooling alignment: According to the type of handle to be tested, place the door handle (8) in the clamping space of the fixture assembly (7), adjust the locking block (721), pin (73) and locking bolt (74) to complete the handle clamping and positioning, and lock the fixture assembly. S3, Tangential Direction Calibration: Loosen the locking guide rail assembly (15), pull the door handle (8) to the opening limit position and hold the position; start the first laser emitting assembly (101), swing the robotic arm (9) so that the central laser receiving end on the tangential reference rod (91) receives the laser and marks the first point of the handle tangential; control the handle to retract slightly, the laser emitted by the first laser emitting assembly deviates from the original position, rotate the tangential reference rod (91) so that the long strip signal receiving end (92) receives the laser and thus determines the second point of the handle tangential; the line connecting the two points is the length direction of the long strip signal receiving end, which is the tangential direction of the handle when it is in the limit position; S4, zero-point reference calibration: reset the handle to the limit position; start the second laser emitting component (103), adjust the angle reference rod (1022) so that the tangential laser receiving end (93) receives the laser signal of the second laser emitting component (103) and complete the zero-point reference calibration of the angle ruler (1021), that is, the zero-point reference calibration of the force angle; adjust the telescopic drive component so that the support seat slides along the horizontal linear guide rail and thus rotates the angle of the fixed seat so that the angle vernier scale at the top of the fixed seat is aligned with the 90° position in the middle of the angle ruler, that is, at this time the angle vernier scale points to the tangential direction of the movement trajectory when the handle reaches the limit position, and then fix the support seat to fix the position of the fixed seat; S5, Loading and Holding: The operating screw (5) applies a specified load along the tangential direction of the handle's movement at the limit position and holds the load for a set duration; The force sensing acquisition module (11) acquires force values ​​in real time and simultaneously triggers a high-speed camera to acquire test images; S6. End of test: Unload the load, release the handle, and export the force-time test data.

10. The method for testing the strength of a car door handle according to claim 9, characterized in that, In step S5, the angular deviation of the force direction relative to the tangent direction of the handle movement is controlled within ±5°; when testing the outer handle, a load of not less than 500N is applied and held for not less than 5s; when testing the ordinary inner handle, a load of not less than 200N is applied and held for not less than 5s.

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