Automobile plastic part testing fixture and method

Abstract

The application discloses a kind of automobile plastic piece testing fixture and method, it is related to automobile plastic piece testing fixture technical field;The present application includes testing fixture ontology and detector, detector includes handle and detection head;The lower surface of detection head is equipped with first universal ball, and the upper surface is equipped with adjusting port, and adjusting port is installed detection block, and the upper surface of detection block is equipped with second universal ball;Detection head inside is equipped with the adjusting component of adjusting detection block height of extension and laser ranging sensor;Detection block is equipped with displacement detection element and electromagnet in it.The present application realizes the quantitative detection of automobile plastic piece and detection profile gap, avoids the problem that traditional stop gauge relies on hand feeling and is easy to scratch parts, improves detection precision and efficiency, reduces the risk of misjudgment, and is suitable for gap detection of various automobile plastic parts.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive plastic part inspection tools, and particularly to an automotive plastic part inspection tool and method. Background Art

[0002] After automotive plastic parts (such as interior and exterior trim parts, body covering parts, etc.) are produced, it is necessary to use inspection tools to detect the dimensional accuracy such as surface profile and clearance to ensure the assembly accuracy and appearance quality. In the prior art, the common detection method is manual detection using go / no-go gauges. The operator places the plastic part to be detected into the inspection tool, fixes it through positioning pins and reference planes, then holds the metal go / no-go gauge and inserts it into the gap between the plastic part and the inspection tool surface, and judges whether it passes or stops by feeling, and then determines whether the part is qualified.

[0003] However, this detection method has the following defects: First, the detection result completely depends on the experience and feeling of the operator. The consistency of different operators is poor. New employees are likely to cause deformation of the plastic part or wear of the inspection tool due to improper force, and even misjudgment due to incomplete insertion. Second, the go / no-go gauge repeatedly rubs against the surfaces of the plastic part and the inspection tool, which is extremely easy to leave scratches on the appearance surface of the plastic part and also accelerates the wear of the inspection tool body. Third, the go / no-go gauge can only provide qualitative results (pass or stop) and cannot give specific values. When the gap is at the tolerance critical value, it is difficult to accurately judge whether the product is qualified. Therefore, the existing automotive plastic part detection technology has obvious deficiencies in terms of detection accuracy, operation stability, part protection and data traceability, and there is an urgent need for a new inspection tool and detection method that can be quantified, cause low damage and have high reliability. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems raised in the background art, and to propose an automotive plastic part inspection tool and method.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions: An automotive plastic part inspection tool includes an inspection tool body, on which there is a detection surface for placing the part to be detected, and also includes a detector, and the detector includes a handle and a detection head; The detection head is used to insert into the gap between the part to be detected and the detection surface. The detection head has a lower surface facing the detection surface and an upper surface facing the part to be detected. There are first universal ball bearings on the lower surface of the detection head, and an adjustment port on the upper surface of the detection head. A telescopic detection block is installed in the adjustment port, and there is a second universal ball bearing on the upper surface of the detection block; An adjustment component is provided inside the detection head, and the adjustment component is used to adjust the height of the detection block protruding from the upper surface of the detection head to set the initial distance between the first universal ball bearing and the second universal ball bearing, and a laser distance sensor is provided inside the detection head to detect the height of the detection block protruding; The detection block adaptively expands and contracts as the gap between the workpiece to be tested and the detection surface changes. The detection block is equipped with a displacement detection element to detect the expansion and contraction of the detection block in real time, thereby reflecting the actual change in the gap. At the same time, it works in conjunction with the laser rangefinder in the detection head to determine whether the gap to be tested exceeds the preset tolerance range.

[0006] As a further embodiment of the present invention: the detection block includes an upper panel, a lower panel, and a corrugated expansion joint connected between the upper panel and the lower panel; a second universal ball bearing is installed on the upper surface of the upper panel; the lower panel is connected to the adjustment assembly; and a reset spring is provided between the upper panel and the lower panel. The displacement detection element is a laser rangefinder or a pressure sensor, used to detect the change in distance between the upper panel and the lower panel, i.e., the compression or stretching of the corrugated expansion joint.

[0007] As a further aspect of the present invention: electromagnets are embedded in the upper panel and the lower panel, and when the electromagnets are energized, they generate mutually repulsive magnetic forces, causing the upper panel and the lower panel to separate.

[0008] As a further embodiment of the present invention: the adjustment assembly includes an adjustment block, a push block, a first limiting plate, a second limiting plate, and an adjustment screw; the detection head is provided with a cavity, the first limiting plate and the second limiting plate are fixed in the cavity, the adjustment block is slidably installed between the first limiting plate and the second limiting plate, and the adjustment block is fixedly connected to the detection block; The adjusting block has a first inclined surface, and the push block has a second inclined surface that cooperates with the first inclined surface. The push block is slidably disposed in the cavity, and the second inclined surface is in contact with the first inclined surface. The adjusting screw passes through the second limiting plate and the push block, and is threadedly connected to the push block. The upper end of the adjusting screw is rotatably connected to the first limiting plate, and the lower end extends out of the detection head and is connected to the adjusting knob on the handle. Rotating the adjustment knob drives the adjustment screw to rotate, which in turn drives the push block to move along the axis of the adjustment screw. The push block is then moved through the inclined surface, thereby adjusting the extension height of the detection block.

[0009] As a further aspect of the present invention: the detection head is generally a cuboid with a chamfer at its front end, which facilitates insertion into the gap between the workpiece to be detected and the detection surface; Multiple rollers are embedded on the four edges of the detection head, and the rims of the rollers protrude from the surface of the detection head for rolling contact with the workpiece to be detected and the detection surface. The rollers are made of elastic rubber.

[0010] As a further aspect of the present invention: the handle is provided with a display unit electrically connected to the displacement detection element for displaying detection data; The display unit includes a display screen, which is used to display real-time measurement values ​​and change the display color and emit a prompt sound when the values ​​exceed a preset tolerance range.

[0011] As a further aspect of the present invention: the handle is provided with a power module, which is electrically connected to the electromagnet, the laser rangefinder, the displacement detection element and the display unit respectively, and is used to provide working power.

[0012] A method of using an automotive plastic parts inspection tool as described above includes the following steps: S1: Place the automotive plastic part to be inspected onto the fixture body and fix it to the inspection surface by means of positioning pins and reference surfaces, so that the part to be inspected and the inspection surface form a preset inspection gap; S2: Based on the design gap between the workpiece to be tested and the test surface, adjust the initial extension height of the test block by adjusting the component so that the initial distance between the first universal ball and the second universal ball is equal to the design gap; S3: Insert the detection head into the gap between the workpiece to be tested and the detection surface, energize the electromagnet inside the detection block, so that the upper panel and the lower panel generate a repulsive force, so that the first universal ball contact the detection surface and the second universal ball contact the workpiece to be tested. S4: The hand handle drives the detection head to move along the contour of the surface of the part to be inspected. The detection block automatically extends and retracts with the change of gap. The displacement detection element collects the extension and retraction data in real time and transmits it to the display unit. S5: Observe the values ​​on the display unit to determine whether the gaps at various points on the part to be inspected are within the tolerance range.

[0013] Compared with existing technologies, the advantages of this invention are: 1. This invention measures the change in gap between automotive plastic parts and the test surface in real time using a detection block and displays the value on the display screen. The operator can directly read the specific value and determine whether it exceeds the tolerance. This eliminates the problems of traditional no-go gauges that rely on touch, can only make qualitative judgments, and cannot accurately determine critical gaps. In addition, the display unit intuitively prompts the operator through color changes, reducing the risk of misjudgment and improving detection efficiency.

[0014] 2. The initial extension height of the detection block can be set by adjusting the components to adapt to different design gaps, making it highly versatile. The elastic rubber rollers on the edge of the detection head not only serve as guides, making the detection head move more smoothly, but also prioritize contact with the workpiece and fixture surface, avoiding accidental scratches to the detection head body. At the same time, universal ball bearings are used as contact components to reduce the risk of scratches and wear on the plastic parts and fixture surfaces, extend the service life of the fixture, and ensure the appearance quality of the parts. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 A magnified schematic diagram of the partial structure at point A in the middle; Figure 3 This is a schematic diagram of the detector structure of the present invention; Figure 4 This is a schematic diagram of the detector of the present invention from another angle; Figure 5 This is a schematic diagram of the handle and detection head of the present invention; Figure 6 for Figure 5 A magnified schematic diagram of the local structure at point B; Figure 7 This is a schematic diagram of the disassembled structure of the detection head of the present invention; Figure 8 This is a schematic diagram of the mounting structure of the handle and the detection head housing of the present invention; Figure 9 This is a schematic diagram of the detection block of the present invention.

[0016] In the diagram: 1. Inspection fixture body; 2. Inspection surface; 3. Detector; 4. Handle; 5. Inspection head; 6. First universal ball bearing; 7. Inspection block; 71. Adjustment port; 8. Second universal ball bearing; 9. Adjustment assembly; 10. Top panel; 11. Bottom panel; 12. Corrugated expansion joint; 13. Return spring; 15. Adjustment block; 16. Push block; 17. First limiting plate; 18. Second limiting plate; 19. Adjustment screw; 20. Cavity; 21. First inclined surface; 22. Second inclined surface; 23. Adjustment knob; 24. Roller; 241. Groove; 25. Display unit. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Reference Figures 1 to 9 An automotive plastic parts inspection tool includes an inspection body 1, with an integrally formed inspection surface 2 on the top of the inspection body 1. The outline of the inspection surface 2 is adapted to the shape of the automotive plastic parts to be inspected, and is used to place and position the parts to be inspected. A detector 3 cooperates with the inspection body 1 to complete the inspection operation. The detector 3 consists of two parts: a handle 4 and a detection head 5. The detection head 5 is fixedly connected to the handle 4.

[0019] The detection head 5 is designed as a cuboid structure with a chamfer at the front end to facilitate smooth insertion into the gap between the workpiece to be tested and the detection surface 2. This avoids the sharp tip of the detection head 5 from scratching the surface of the workpiece or the detection surface 2 of the gauge, and also makes it easier to insert into areas with small gaps.

[0020] The lower surface of the detection head 5 faces the detection surface 2, and the upper surface faces the workpiece to be inspected. The lower surface is fixedly equipped with a first universal ball bearing 6, which is embedded in the lower surface of the detection head 5. Its function is to form a rolling contact between the detection head 5 and the detection surface 2, replacing the sliding friction of the traditional no-go gauge, greatly reducing the wear on the detection surface 2, and reducing the resistance when the detection head 5 moves, making the inspection operation smoother.

[0021] Reference Figures 3 to 6 The upper surface of the detection head 5 has an adjustment port 71, which communicates with the cavity 20 inside the detection head 5. The detection block 7 is embedded in the adjustment port 71 and can move up and down along the adjustment port 71 to adjust the extension height. The upper surface of the detection block 7 is also equipped with a second universal ball bearing 8, which is used to form rolling contact with the surface of the part to be inspected, avoiding direct hard contact between the detection block 7 and the part to be inspected and causing scratches, thus effectively protecting the appearance quality of the automotive plastic parts to be inspected.

[0022] The detection block 7 consists of an upper panel 10, a lower panel 11, and a corrugated expansion joint 12 connecting the two. The upper panel 10 and the lower panel 11 are arranged in parallel. The corrugated expansion joint 12 is a flexible sealing structure, which can realize the expansion and contraction movement between the upper panel 10 and the lower panel 11, and also play a sealing role to prevent dust and impurities from entering the interior of the detection block 7.

[0023] The second universal ball bearing 8 is fixedly installed on the upper surface of the upper panel 10, while the lower panel 11 is fixedly connected to the adjustment component 9 inside the detection head 5, ensuring that the adjustment component 9 can drive the detection block 7 to move up and down as a whole, thereby adjusting the extension height. A return spring 13 is also installed between the upper panel 10 and the lower panel 11. The two ends of the return spring 13 are fixedly connected to the lower surface of the upper panel 10 and the upper surface of the lower panel 11, respectively. When the detection block 7 is not subjected to external force, the return spring 13 returns the upper panel 10 and the lower panel 11 to their initial positions, ensuring that the extension and retraction movement of the detection block 7 can flexibly respond to changes in the gap.

[0024] Both the upper panel 10 and the lower panel 11 are equipped with electromagnets. The two electromagnets are installed in corresponding positions and can generate mutually repulsive magnetic forces when energized. During testing, the repulsive force generated by the electromagnets can separate the upper panel 10 and the lower panel 11, thereby pushing the second universal ball 8 to tightly adhere to the surface of the workpiece to be tested and the first universal ball 6 to tightly adhere to the test surface 2. This ensures that the two universal balls always maintain effective contact with the corresponding contact surfaces during the testing process, avoiding testing errors caused by loose contact.

[0025] Reference Figures 6 to 7 An adjustment component 9 is installed inside the cavity 20 of the detection head 5. The adjustment component 9 is used to adjust the height of the detection block 7 extending out of the upper surface of the detection head 5, thereby adjusting the initial distance between the first universal ball 6 and the second universal ball 8 to adapt to the design gap between the test piece of different specifications and the detection surface 2.

[0026] The adjustment assembly 9 consists of an adjustment block 15, a push block 16, a first limiting plate 17, a second limiting plate 18, and an adjustment screw 19. The first limiting plate 17 and the second limiting plate 18 are fixed in the cavity 20. The adjustment block 15 is slidably installed between the first limiting plate 17 and the second limiting plate 18 and can only slide in the up and down direction. The adjustment block 15 is fixedly connected to the lower panel 11 of the detection block 7, so that the up and down movement of the adjustment block 15 can directly drive the detection block 7 to move synchronously, thereby adjusting the extension height of the detection block 7.

[0027] The bottom of the adjusting block 15 is provided with a first inclined surface 21, and the top of the push block 16 is provided with a second inclined surface 22 that matches the first inclined surface 21. The push block 16 is slidably disposed in the cavity 20, and the second inclined surface 22 is in close contact with the first inclined surface 21. The upper end of the adjusting screw 19 passes through the second limiting plate 18 and the push block 16, and is threadedly connected to the push block 16. The upper end is rotatably connected to the first limiting plate 17 to ensure that the adjusting screw 19 will not move up and down when rotating, but can only rotate around its own axis; the adjusting screw The lower end of rod 19 extends out of the bottom of detection head 5 and is fixedly connected to adjustment knob 23 on handle 4. The operator can drive adjustment screw 19 to rotate synchronously by rotating adjustment knob 23. Since adjustment screw 19 is threadedly connected to push block 16, rotation of adjustment screw 19 will drive push block 16 to move up and down along the axis of adjustment screw 19. When push block 16 moves, it pushes adjustment block 15 to slide up and down through mutually fitting inclined surfaces, thereby driving detection block 7 to move up and down, realizing the adjustment of the extension height of detection block 7.

[0028] Meanwhile, the detection head 5 is equipped with a laser range sensor. This sensor works in conjunction with the adjustment component 9 to detect the height of the detection block 7 extending out of the upper surface of the detection head 5 in real time, and provides feedback on the initial distance between the first universal ball 6 and the second universal ball 8. This allows the operator to accurately set the initial distance between the first universal ball 6 and the second universal ball 8, ensuring that the initial distance is consistent with the design clearance of the part to be tested.

[0029] The four edges of the inspection head 5 are provided with grooves 241, and rollers 24 are rolled and embedded in the grooves 241. The rollers 24 can roll around their own axis as the center of rotation. The rim of the rollers 24 protrudes from the surface of the inspection head 5, and the rollers 24 are made of elastic rubber. After the inspection head 5 is inserted into the gap, the rollers 24 first contact the workpiece to be inspected and the inspection surface 2, which plays a guiding role, making the inspection head 5 move more smoothly along the contour of the workpiece to be inspected. At the same time, it can avoid hard contact between the inspection head 5 and the workpiece to be inspected and the inspection fixture, further protecting the appearance of the workpiece to be inspected and the inspection surface 2, reducing wear, and also adapting to slight undulations of the surface, ensuring the stability of the movement of the inspection head 5.

[0030] The handle 4 is equipped with a display unit 25, which is electrically connected to the displacement detection element inside the detection block 7. This unit displays the detection data in real time. The displacement detection element, installed inside the detection block 7, can be a laser rangefinder or a pressure sensor. Its working principle is to detect the distance change between the upper panel 10 and the lower panel 11, which is the compression or tension of the corrugated expansion joint 12, and then convert this into the gap change between the part to be tested and the detection surface 2. The display unit 25 includes a display screen that can display the specific value of the gap change in real time. It also has a preset tolerance range. When the detected value exceeds the preset tolerance range, the display screen automatically changes color and emits a warning sound. This design intuitively reminds the operator that the part has an out-of-tolerance problem, overcoming the limitation of traditional go / no-go gauges which can only qualitatively judge (go or no-go). It achieves quantitative gap detection, especially for judging tolerance thresholds, which is more accurate and reduces the risk of misjudgment. Furthermore, the detection data is traceable, facilitating subsequent quality analysis and traceability.

[0031] The handle 4 is also equipped with a power module, which is electrically connected to the electromagnet in the detection block 7, the laser rangefinder in the detection head 5, the displacement detection element in the detection block 7, and the display unit 25, respectively, to provide a stable power supply for each component and ensure that the entire fixture can operate normally.

[0032] To further clarify, the aforementioned fixed connection should be interpreted broadly unless otherwise explicitly specified and limited. For example, it may be welding, gluing, or integral molding, or other conventional methods well known to those skilled in the art.

[0033] A method for using an automotive plastic parts inspection tool includes the following steps: S1: Place the plastic part of the car to be inspected onto the inspection surface 2 of the fixture body 1, and fix the part to be inspected by the preset positioning pin and reference surface on the fixture body 1 to ensure that a preset inspection gap is formed between the part to be inspected and the inspection surface 2.

[0034] S2: The operator, based on the drawing requirements of the part to be inspected, obtains the design gap value between it and the inspection surface 2, and adjusts the initial extension height of the inspection block 7 through the adjustment component 9: The operator rotates the adjustment knob 23 on the handle 4, which drives the adjustment screw 19 to rotate, driving the push block 16 to move along the screw axis. The push block 16 pushes the adjustment block 15 up and down through the inclined surface, thereby driving the inspection block 7 to move synchronously. At this time, the laser range sensor inside the inspection head 5 detects the extension height of the inspection block 7 in real time and feeds the data back to the display unit 25. The operator adjusts the adjustment knob 23 according to the feedback data until the initial distance between the first universal ball 6 and the second universal ball 8 is equal to the design gap, thus completing the initial adjustment.

[0035] S3: The operator holds the handle 4 and gently inserts the front end of the detection head 5 into the gap between the workpiece to be tested and the detection surface 2. Then, the electromagnet inside the detection block 7 is energized. The repulsive force generated by the electromagnet causes the upper panel 10 and the lower panel 11 to separate further, thereby ensuring that the first universal ball 6 is tightly pressed against the detection surface 2 and the second universal ball 8 is tightly pressed against the lower surface of the workpiece to be tested.

[0036] S4: The operator holds the handle 4 and drives the detection head 5 to move slowly along the contour of the surface of the workpiece to be inspected. During the movement, if the gap between the workpiece to be inspected and the detection surface 2 changes, the detection block 7 will automatically extend and retract with the real-time change of the gap. The displacement detection element in the detection block 7 collects the distance change between the upper panel 10 and the lower panel 11 (i.e., the extension and retraction of the corrugated expansion joint 12) in real time and transmits the collected gap change data to the display unit 25 on the handle 4 in real time.

[0037] S5: While moving the inspection head 5, the operator observes the changes in the values ​​on the display unit 25. If the values ​​remain stable near the design value and no color alarm is triggered, the contour gap at that location is deemed acceptable. If the display shows red and is accompanied by a beep, it indicates that the gap is out of tolerance. The operator can mark the part or fixture. After completing the inspection of all contours, the operator can comprehensively determine whether the automotive plastic part is qualified.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A tooling for inspecting automotive plastic parts, comprising a tooling body (1), wherein the tooling body (1) is provided with a detection surface (2) for placing the part to be inspected, characterized in that, It also includes a detector (3), which includes a handle (4) and a detection head (5); The detection head (5) is used to insert into the gap between the workpiece to be tested and the detection surface (2). The detection head (5) has a lower surface facing the detection surface (2) and an upper surface facing the workpiece to be tested. The lower surface of the detection head (5) is provided with a first universal ball (6). The upper surface of the detection head (5) is provided with an adjustment port (71). A telescopic detection block (7) is installed in the adjustment port (71). The upper surface of the detection block (7) is provided with a second universal ball (8). The detection head (5) is provided with an adjustment component (9) inside. The adjustment component (9) is used to adjust the height of the detection block (7) extending out of the adjustment port (71) to set the initial distance between the first universal ball (6) and the second universal ball (8). The detection head (5) is provided with a laser range sensor inside to detect the height of the detection block (7) extending out. The detection block (7) adapts to the change in the gap between the part to be tested and the detection surface (2). The detection block (7) is equipped with a displacement detection element to detect the amount of expansion and contraction of the detection block (7) in real time. In conjunction with the laser range sensor in the detection head (5), it determines whether the gap to be tested exceeds the preset tolerance range.

2. The automotive plastic parts inspection fixture according to claim 1, characterized in that, The detection block (7) includes an upper panel (10), a lower panel (11), and a corrugated expansion joint (12) connecting the upper panel (10) and the lower panel (11). A second universal ball bearing (8) is installed on the upper surface of the upper panel (10). The lower panel (11) is connected to the adjustment assembly (9). A return spring (13) is provided between the upper panel (10) and the lower panel (11). The displacement detection element is a laser rangefinder or a pressure sensor, used to detect the change in distance between the upper panel (10) and the lower panel (11), i.e. the compression or stretching of the corrugated expansion joint (12).

3. The automotive plastic parts inspection fixture according to claim 2, characterized in that, Electromagnets are embedded in the upper panel (10) and the lower panel (11). When the electromagnets are energized, they generate a repulsive magnetic force, causing the upper panel (10) and the lower panel (11) to separate.

4. The automotive plastic parts inspection fixture according to claim 3, characterized in that, The adjustment assembly (9) includes an adjustment block (15), a push block (16), a first limiting plate (17), a second limiting plate (18), and an adjustment screw (19). The detection head (5) has a cavity (20), the first limiting plate (17) and the second limiting plate (18) are fixed in the cavity (20), the adjustment block (15) is slidably installed between the first limiting plate (17) and the second limiting plate (18), and the adjustment block (15) is fixedly connected to the detection block (7). The adjusting block (15) has a first inclined surface (21), and the push block (16) has a second inclined surface (22) that cooperates with the first inclined surface (21). The push block (16) is slidably disposed in the cavity (20), and the second inclined surface (22) is in contact with the first inclined surface (21). The adjusting screw (19) passes through the second limiting plate (18) and the push block (16) and is threadedly connected to the push block (16). The upper end of the adjusting screw (19) is rotatably connected to the first limiting plate (17). The lower end of the adjusting screw (19) extends out of the detection head (5) and is connected to the adjusting knob (23) on the handle (4). Rotating the adjustment knob (23) causes the adjustment screw (19) to rotate, driving the push block (16) to move along the axis of the adjustment screw (19), thereby pushing the adjustment block (15) to move and adjusting the extension height of the detection block (7).

5. The automotive plastic parts inspection fixture according to claim 4, characterized in that, The detection head (5) is a cuboid in shape, with a chamfer at the front end to facilitate insertion into the gap between the part to be tested and the detection surface (2); The four edges of the detection head (5) are provided with multiple grooves (241) for embedding rollers (24). The rim of the rollers (24) protrudes from the surface of the detection head (5) and is used to make rolling contact with the workpiece to be tested and the detection surface (2). The roller (24) is made of elastic rubber.

6. The automotive plastic parts inspection fixture according to claim 5, characterized in that, The handle (4) is provided with a display unit (25) electrically connected to the displacement detection element for displaying detection data; The display unit (25) includes a display screen, which is used to display real-time measurement values ​​and change the display color and emit a prompt sound when the values ​​exceed the preset tolerance range.

7. The automotive plastic parts inspection fixture according to claim 6, characterized in that, The handle (4) is equipped with a power module, which is electrically connected to the electromagnet, laser rangefinder, displacement detection element and display unit (25) respectively, and is used to provide working power.

8. A method of using the automotive plastic parts inspection fixture as described in claim 7, characterized in that, Includes the following steps: S1: Place the plastic part of the car to be inspected onto the fixture body (1) and fix it to the inspection surface (2) by means of the positioning pin and the reference surface, so that the part to be inspected and the inspection surface (2) form a preset inspection gap; S2: Based on the design gap between the part to be tested and the test surface (2), adjust the initial extension height of the test block (7) by adjusting the component (9) so that the initial distance between the first universal ball (6) and the second universal ball (8) is equal to the design gap; S3: Insert the detection head (5) into the gap between the workpiece to be tested and the detection surface (2), energize the electromagnet inside the detection block (7), so that the upper panel (10) and the lower panel (11) generate a repulsive force, so that the first universal ball (6) contacts the detection surface (2) and the second universal ball (8) contacts the workpiece to be tested; S4: The hand handle (4) drives the detection head (5) to move along the contour of the surface of the part to be tested. The detection block (7) automatically extends and retracts with the change of gap. The displacement detection element collects the extension and retraction data in real time and transmits it to the display unit (25). S5: Observe the values ​​on the display unit (25) to determine whether the gaps at various points of the part to be tested are within the tolerance range.

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