Automobile safety belt stop wheel comprehensive testing fixture and using method thereof

Abstract

The present application relates to a kind of automobile safety belt stop wheel comprehensive testing tool and its using method, belong to automobile accessory detection technical field.It includes base, the upper surface of base is fixedly provided with fixed shell, the upper surface of fixed shell is provided with detection mechanism and the positioning mechanism for fixing stop wheel, the inside of fixed shell is provided with driving mechanism and linkage dust removal mechanism;Detection mechanism includes the rotary seat fixed on the upper surface of fixed shell.The present application is driven by driving mechanism to make stop wheel autorotation and carry out round runout detection, simultaneously drive linkage cam rotation, linkage cam periodically extrude bellows and generate compressed airflow, continuously spray air to dial test head and stop wheel detection surface by jet nozzle alignment, automatically remove iron filings and dust on the surface of stop wheel, avoid impurity interference detection, realize detection and dust removal synchronous automatic completion;Cooperate with dustproof dehumidification net to dry filter air, ensure that detection surface is free from impurities, no moisture influence, greatly improve the accuracy and stability of round runout detection.

Description

Technical Field

[0001] This invention relates to a comprehensive inspection tool for automotive seat belt stop wheels and its usage method, which belongs to the field of automotive parts testing technology. Background Technology

[0002] As a core functional component of the seat belt retractor, the seat belt stop roller needs to be tested for indicators such as circumferential runout using specialized inspection tools during the mass production process of automotive seat belt stop rollers to ensure the consistency of product quality.

[0003] In existing technologies, the circular runout detection of automotive seat belt stop wheels often uses traditional dial indicator gauges. However, these gauges generally have the following drawbacks in actual testing: 1) The external clamping structure is prone to eccentric clamping or end face tilting during clamping, and lacks a stable end face support structure. During the rotational testing process, the stop wheel is prone to radial wobble and axial movement, affecting the actual testing accuracy; 2) During the machining and transfer process, the surface of the stop wheel is prone to adhering to impurities such as iron filings, dust, and cutting fluid residue. Traditional gauges do not have a dust removal structure that operates synchronously with the testing, requiring manual wiping in advance or separate air gun blowing, which increases the operation steps. Furthermore, manual dust removal is incomplete and unstable, and there is still a risk of impurity interference. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings in the prior art and to provide a more rationally designed integrated inspection tool for automotive seat belt stop wheels.

[0005] Accordingly, the present invention also provides a method for using the above-mentioned comprehensive inspection tool for car seat belt stop wheels, which is simpler to use and has better accuracy and stability in testing.

[0006] This invention provides the following technical solution: a comprehensive inspection tool for automotive seat belt stop wheels, comprising a fixed housing, on which a detection mechanism and a positioning mechanism for fixing the stop wheel are provided; the fixed housing contains a drive mechanism and a linked dust removal mechanism; the detection mechanism includes a horizontal adjustment screw connected to a horizontal adjustment plate, an L-shaped detection frame fixedly connected to one side of the horizontal adjustment plate, a vertical adjustment screw rotatably mounted on the L-shaped detection frame, a vertical adjustment block threadedly connected to the vertical adjustment screw, a limit sleeve fixedly connected to one end of the vertical adjustment block, and a dial indicator inserted and installed inside the limit sleeve.

[0007] The positioning mechanism of the present invention includes a positioning cylinder rotatably disposed on the upper surface of the fixed shell. Both sides of the positioning cylinder are provided with arc-shaped positioning plates for internally expanding and fixing the inner hole of the stop wheel. The position of the positioning cylinder corresponds to the detection head of the dial indicator.

[0008] The upper surface of the positioning cylinder of the present invention has a rectangular mounting groove. The inner bottom wall of the rectangular mounting groove is rotatably connected to a positioning screw. The surface of the positioning screw is threaded with a movable block. The left and right sides of the movable block are fixedly connected to a first trapezoidal block. The two arc-shaped positioning plates are fixedly connected to a second trapezoidal block. The end of the second trapezoidal block away from the arc-shaped positioning plate extends into the interior of the rectangular mounting groove. The position of the first trapezoidal block corresponds to the second trapezoidal block. The inclined surfaces of the first trapezoidal block and the second trapezoidal block overlap each other.

[0009] An extension plate is fixedly connected to the lower surface of the second trapezoidal block of the present invention, and a return spring is fixedly connected to the surface of the extension plate. The end of the return spring away from the extension plate is fixedly connected to the inner wall of the rectangular mounting groove. A rectangular through hole matching the second trapezoidal block is opened on the inner side wall of the rectangular mounting groove, and the second trapezoidal block is slidably connected to the inner wall of the rectangular through hole.

[0010] The rectangular mounting groove of the present invention has guide grooves on both the front and rear inner walls. Guide sliders are fixedly connected to both the front and rear surfaces of the movable block. The guide sliders are slidably connected to the inner walls of the guide grooves. A positioning knob is fixedly connected to the top of the positioning screw. Anti-slip rubber pads are fixedly connected to the surfaces of the two arc-shaped positioning plates that are far apart from each other.

[0011] The upper surface of the fixed shell of the present invention is fixedly connected with four support frames, and the top of the support frames is rotatably connected with support rollers. The four support rollers are evenly distributed in a cross-shaped array on the surface of the fixed shell, and the four support rollers are symmetrically distributed around the positioning cylinder. The support rollers are used to guide and support the lower end face of the stop wheel.

[0012] The linkage dust removal mechanism of the present invention includes a corrugated air cylinder fixedly connected to the inner wall of a fixed shell, an extrusion plate fixedly connected to the end of the corrugated air cylinder, a linkage push rod fixedly connected to the surface of the extrusion plate, a movable plate fixedly connected to the end of the linkage push rod, a rotating shaft rotatably connected to the inner top wall of the fixed shell, a linkage cam fixedly connected to the surface of the rotating shaft, the position of the linkage cam corresponding to the movable plate, and the linkage cam overlapping the surface of the movable plate, a compression spring sleeved on the surface of the linkage push rod, a baffle fixedly connected to the inner wall of the fixed shell, one end of the compression spring fixedly connected to the surface of the movable plate, and the other end of the compression spring fixedly connected to the surface of the baffle.

[0013] The present invention has an air inlet pipe fixedly embedded at the air inlet end of the corrugated air cylinder, a dehumidification box fixedly attached at the air inlet end of the air inlet pipe, a dustproof and dehumidifying mesh fixedly installed inside the dehumidification box, a one-way air inlet valve fixedly installed on the surface of the air inlet pipe, a ducted air hose fixedly connected to the air outlet end of the corrugated air cylinder, an extension bracket fixedly connected to the upper surface of the limiting sleeve, a jet nozzle fixedly connected to the surface of the extension bracket, a delivery air hose fixedly connected to the air inlet end of the jet nozzle, the end of the delivery air hose away from the jet nozzle extending downward into the interior of the fixed shell and fixedly connected to the output end of the ducted air hose, and a one-way exhaust valve fixedly attached to the air inlet end of the ducted air hose.

[0014] The nozzle of the present invention is located directly above the dial indicator detection head. The side of the limiting sleeve is provided with a bolt fixing hole. The inner wall of the bolt fixing hole is threaded with a limiting bolt. The limiting bolt is used to tighten and limit the dial indicator. The top of the L-shaped detection frame is fixed with a lifting motor. The rotating shaft of the lifting motor is fixedly connected to the top of the vertical adjusting screw.

[0015] The driving mechanism of the present invention includes a drive motor fixed to the top wall of the fixed housing, a drive shaft fixedly connected to the output end of the drive motor, a drive gear fixedly connected to the surface of the drive shaft, a bottom end of the positioning cylinder extending into the interior of the fixed housing and fixedly connected to a transmission shaft, a transmission gear fixedly connected to the surface of the transmission shaft, and a linkage gear fixedly connected to the surface of the rotating shaft. Both the linkage gear and the drive gear mesh with the transmission gear, and the gear ratio between the transmission gear and the linkage gear is 100:1.

[0016] This invention also relates to a method of using the aforementioned comprehensive inspection tool for automotive seat belt stop wheels, which includes the following steps: Step 1: First, use the positioning mechanism to limit and fix the car seat belt stop wheel; Step 2: Then, use the drive mechanism to drive the stop wheel to rotate horizontally; Step 3: Simultaneously, use the linkage dust removal mechanism to remove dust and dry the detection surface of the stop wheel; Step 4: Finally, use a testing mechanism to perform a circular runout test on the circumferential surface of the stop wheel.

[0017] Compared with the prior art, the beneficial effects of this invention are: The inspection tool has a more reasonable structural design and is more reliable to use; moreover, its usage method is simpler, and the accuracy and stability of the inspection are better.

[0018] When the drive mechanism drives the stop wheel to rotate for circular runout detection, the synchronous drive cam rotates, which can automatically remove iron filings and dust from the surface of the stop wheel, avoiding impurities from interfering with the detection, and realizing the simultaneous and automatic completion of detection and dust removal; the air nozzle moves synchronously with the detection mechanism, which can ensure that the detection surface is free of impurities and moisture, and improve the accuracy and stability of circular runout detection.

[0019] The internal expansion centering and positioning mechanism enables automatic centering and uniform tightening of the inner hole of the stop wheel; it can also quickly complete the coaxial positioning and stable clamping of the stop wheel, effectively avoiding clamping eccentricity, end face tilting or rotational wobbling, and ensuring the accuracy of circular runout detection from the clamping source; at the same time, it is compatible with stop wheels of different inner diameter specifications, with high clamping efficiency and strong versatility.

[0020] By driving the stop wheel to rotate at a constant speed through the drive mechanism, automated continuous detection of circular runout in the full circumference and height can be achieved. There is no need for manual rotation of the workpiece or repeated adjustment of the dial indicator height, which shortens the detection time, improves the detection efficiency, and the detection trajectory is uniform and continuous. Attached Figure Description

[0021] Figure 1 This is a front view structural diagram of the present invention; Figure 2 This is a schematic diagram of the rear view structure of the present invention; Figure 3 This is a side view of the structure of the present invention; Figure 4 for Figure 3 Enlarged structural diagram at point A; Figure 5 This is a schematic diagram of the positioning cylinder cross-section structure of the present invention; Figure 6 This is a schematic diagram of the internal structure of the fixed shell of the present invention; Figure 7 for Figure 6 Enlarged structural diagram at point B; Figure 8 This is a schematic diagram of the drive mechanism structure of the present invention.

[0022] In the diagram: 1. Fixed housing; 2. Detection mechanism; 3. Positioning mechanism; 4. Drive mechanism; 5. Linked dust removal mechanism; 201. Horizontal adjusting screw; 202. Horizontal adjusting plate; 203. L-shaped detection frame; 204. Vertical adjusting screw; 205. Vertical adjusting block; 206. Limit sleeve; 207. Dial indicator; 208. Lifting motor; 209. Limit bolt; 301. Positioning cylinder; 302. Arc-shaped positioning plate; 303. Positioning screw; 304. Movable block; 305. First trapezoidal block; 306. Second trapezoidal block; 307. Return spring; 30 8. Anti-slip rubber pad; 309. Support frame; 310. Rectangular mounting slot; 311. Support roller; 401. Drive motor; 402. Drive gear; 403. Transmission shaft; 404. Transmission gear; 405. Linkage gear; 501. Corrugated air cylinder; 502. Extrusion plate; 503. Linkage push rod; 504. Movable plate; 505. Rotating shaft; 506. Linkage cam; 507. Compression spring; 508. Dehumidifier box; 509. Dustproof and dehumidifying net; 510. Air guide hose; 511. Extension bracket; 512. Air nozzle; 513. Air delivery hose. Detailed Implementation

[0023] The technical solution of the present invention will now be fully described with reference to the accompanying drawings in the embodiments.

[0024] See Figures 1-8 The present invention includes a fixed shell 1, a detection mechanism 2, a positioning mechanism 3, a driving mechanism 4, and a linkage dust removal mechanism 5. The fixed shell 1 is fixedly installed on the upper surface of the base. The detection mechanism 2 and the positioning mechanism 3 are both arranged on the fixed shell 1. The driving mechanism 4 and the linkage dust removal mechanism 5 are installed in the internal cavity of the fixed shell 1.

[0025] The detection mechanism 2 is installed on one side of the upper surface of the fixed housing 1, including a rotating seat. The rotating seat is fixed to the upper surface of the fixed housing 1. The horizontal adjusting screw 201 is rotatably connected inside the rotating seat. One end of the horizontal adjusting screw 201 extends to the outside of the rotating seat and is equipped with an adjusting handwheel. The horizontal adjusting plate 202 is connected to the horizontal adjusting screw 201 through a threaded pair. The L-shaped detection frame 203 is vertically fixed to the side of the horizontal adjusting plate 202 and moves with the horizontal adjusting plate 202 in the horizontal direction to achieve horizontal alignment between the dial indicator 207 and the detection position of the stop wheel. The vertical adjustment screw 204 is rotatably connected inside the vertical section of the L-shaped detection frame 203. The lifting motor 208 is fixed at the top of the L-shaped detection frame 203. The output shaft of the lifting motor 208 is coaxially fixedly connected to the vertical adjustment screw 204. The vertical adjustment block 205 is threadedly engaged with the vertical adjustment screw 204. The limiting sleeve 206 is fixed at one end of the vertical adjustment block 205 near the positioning mechanism 3. The dial indicator 207 is inserted inside the limiting sleeve 206 and is secured by the side limiting bolt 209. The detection head of the dial indicator 207 faces the outer surface of the stop wheel.

[0026] The surface of the L-shaped inspection frame 203 is fixed with a longitudinal guide rod, and the upper surface of the vertical adjustment block 205 is provided with a guide through hole that matches the longitudinal guide rod. The vertical adjustment block 205 is slidably connected to the surface of the longitudinal guide rod through the guide through hole. The longitudinal guide rod is used to limit the vertical movement of the vertical adjustment block 205.

[0027] The dial indicator 207 can be precisely adjusted in horizontal position by adjusting the horizontal adjustment screw 201, which is suitable for the detection of stop wheels with different outer diameters. The lifting motor 208 drives the vertical adjustment screw 204 to rotate, which drives the dial indicator 207 to rise and fall steadily in the vertical direction. Combined with the rotation of the stop wheel, it realizes continuous circular runout detection of the stop wheel in the full circumference and height. There is no need for repeated manual adjustment. The detection trajectory is uniform and the data is complete, which greatly improves the detection efficiency and detection coverage.

[0028] The positioning mechanism 3 is located at the center of the upper surface of the fixed shell 1, corresponding to the dial indicator 207 detection head of the detection mechanism 2. It includes a positioning cylinder 301, which is rotatably mounted at the center of the upper surface of the fixed shell 1. A rectangular mounting groove 311 is opened inside the positioning cylinder 301. A positioning screw 303 is rotatably connected to the inner bottom wall of the rectangular mounting groove 311. The top of the positioning screw 303 extends out of the positioning cylinder 301 and is equipped with a positioning knob. A movable block 304 is threadedly connected to the positioning screw 303. Guide sliders are provided on the front and rear sides of the movable block 304, which slide in cooperation with the guide grooves on the inner wall of the rectangular mounting groove 311 to ensure that the movable block 304 can only move in the vertical direction and will not rotate.

[0029] The first trapezoidal block 305 is symmetrically fixed on the left and right sides of the movable block 304. The second trapezoidal block 306 is fixed inside the arc-shaped positioning plate 302. The end of the second trapezoidal block 306 away from the arc-shaped positioning plate 302 passes through the rectangular through hole in the side wall of the positioning cylinder 301 and extends into the rectangular mounting groove 311. The inclined surfaces of the first trapezoidal block 305 and the second trapezoidal block 306 are fitted and overlapped with each other. An extension plate is provided on the lower side of the second trapezoidal block 306. One end of the return spring 307 is fixed to the extension plate, and the other end is fixed to the inner wall of the rectangular mounting groove 311, providing an inward retraction return force for the arc-shaped positioning plate 302. An anti-slip rubber pad 308 is attached to the outer side of the arc-shaped positioning plate 302 to increase the friction with the inner hole of the stop wheel and prevent rotational slippage. There are four support frames 309, which are evenly distributed in a cross shape around the positioning cylinder 301. The support rollers 310 are rotatably mounted on the top of the support frame 309. The upper surface of the support rollers 310 contacts the lower end face of the stop wheel, so as to achieve stable lifting and rotation guidance of the stop wheel.

[0030] The positioning mechanism 3 adopts an internal expansion centering structure. The rotating positioning screw 303 drives the movable block 304 to move downward, and the first trapezoidal block 305 pushes the second trapezoidal block 306 to move outward, so that the arc-shaped positioning plates 302 on both sides expand synchronously, realizing automatic centering and uniform tightening of the inner hole of the stop wheel, with high clamping coaxiality, avoiding eccentricity and shaking; the cross-shaped support rollers 310 provide multi-point support for the end face of the stop wheel, ensuring smooth rotation without tilting; the anti-slip rubber pad 308 improves clamping stability, and the return spring 307 enables quick release, resulting in high clamping efficiency, adaptability to stop wheels with different inner diameters, strong versatility, and ensuring the accuracy of circular runout detection from the clamping source.

[0031] The drive mechanism 4 is installed inside the cavity of the fixed housing 1, including a drive motor 401 and a transmission shaft 403. The drive motor 401 is fixed to the top wall inside the fixed housing 1, and the output shaft of the drive motor 401 points vertically downward. The drive gear 402 is fixed to the end of the output shaft of the drive motor 401. The upper end of the transmission shaft 403 is fixedly connected to the bottom end of the positioning cylinder 301, and the lower end of the transmission shaft 403 extends into the interior of the fixed housing 1. The transmission gear 404 is fixed to the surface of the transmission shaft 403. The rotating shaft 505 is vertically rotatably installed on the top wall inside the fixed housing 1. The linkage gear 405 is fixed to the surface of the rotating shaft 505. The transmission gear 404 meshes with both the drive gear 402 and the linkage gear 405. The gear ratio of the transmission gear 404 to the linkage gear 405 is set to 100:1, which allows the linkage dust removal mechanism 5 to generate high-speed gas during the low-speed rotation of the positioning mechanism 3, ensuring stable airflow pulses and uniform dust removal effect.

[0032] The linkage dust removal mechanism 5 is installed inside the fixed housing 1 and works in conjunction with the drive mechanism 4. It includes a corrugated air cylinder 501, which is fixed to the inner wall of the fixed housing 1. A compression plate 502 is fixed to the telescopic end of the corrugated air cylinder 501. One end of the linkage push rod 503 is fixed to the compression plate 502, and the other end is fixed to the movable plate 504. A linkage cam 506 is fixed to the surface of the rotating shaft 505, and its outer edge is always in contact with the surface of the movable plate 504. A compression spring 507 is sleeved on the surface of the linkage push rod 503, with one end connected to the movable plate 504 and the other end connected to the internal baffle of the fixed housing 1. This provides a restoring force to the movable plate 504, allowing the linkage cam 506 to periodically push the movable plate 504 and the compression plate 502 when rotating, thus compressing and rebounding the corrugated air cylinder 501. The corrugated air cylinder 501 has an air inlet pipe connected to its inlet end. A dehumidification box 508 is installed at the end of the air inlet pipe, with a dustproof and dehumidifying mesh 509 installed inside. A one-way air inlet valve is installed on the air inlet pipe. The air outlet of the corrugated air cylinder 501 is connected to a flexible air guide hose 510, which has a one-way exhaust valve. An extension bracket 511 is fixed to the upper surface of the limiting sleeve 206. A nozzle 512 is installed at the end of the extension bracket 511, located directly above the dial indicator 207's detection head. The nozzle 512 is connected to the flexible air guide hose 510 via a delivery hose 513.

[0033] The linkage operation is achieved by the power of the drive mechanism 4, without the need for additional air source and electric components. It has a simple structure and is energy-saving and environmentally friendly. The linkage cam 506 periodically squeezes the corrugated air cylinder 501 to generate pulse airflow. The nozzle 512 sprays air continuously at the detection point, automatically removing iron filings, dust and oil stains from the surface of the stop wheel, avoiding impurities from affecting the detection accuracy. The dustproof and dehumidifying net 509 filters and dries the incoming air to prevent moisture and impurities from entering the air path and ensure clean airflow. The nozzle 512 moves synchronously with the detection mechanism 2 and is always aligned with the detection position. Dust removal and detection are carried out simultaneously, effectively improving the detection accuracy and stability.

[0034] Furthermore, the present invention also provides a method for using the above-mentioned comprehensive inspection tool for automotive seat belt stop wheels, which includes the following steps: 1. The operator places the seatbelt stop wheel to be tested, with its inner hole facing downwards, onto the outside of the positioning cylinder 301, ensuring the lower end face of the stop wheel contacts the four support rollers 310. Then, the operator rotates the positioning knob on top of the positioning cylinder 301, causing the positioning screw 303 to rotate. The movable block 304 moves downwards along the guide groove under the action of the thread. Simultaneously, the first trapezoidal blocks 305 on both sides of the movable block 304 move downwards, pushing the second trapezoidal block 306 outwards via the inclined surface. The second trapezoidal block 306 causes the arc-shaped positioning plate 302 to expand outwards, and the anti-slip rubber pad 308 fits tightly against the inner hole of the stop wheel, achieving automatic centering and tightening of the stop wheel. After clamping, the operator rotates the horizontal adjusting screw 201, causing the horizontal adjusting plate 202 to move the L-shaped testing frame 203, aligning the testing head of the dial indicator 207 with the outer testing surface of the stop wheel, completing the pre-test preparation. 2. Start the drive motor 401. The drive motor 401 drives the drive gear 402 to rotate. The drive gear 402 meshes with the transmission gear 404. The transmission gear 404 drives the positioning cylinder 301 to rotate at a constant speed through the transmission shaft 403. The positioning cylinder 301 drives the stop wheel to rotate synchronously horizontally through the arc-shaped positioning plate 302. 3. As the transmission gear 404 rotates, it meshes with and drives the linkage gear 405 to rotate at a low speed. The linkage gear 405 drives the linkage cam 506 to rotate via the rotating shaft 505. The linkage cam 506 periodically pushes the movable plate 504 towards the corrugated air cylinder 501. The movable plate 504 pushes the extrusion plate 502 to compress the corrugated air cylinder 501 via the linkage push rod 503. The air inside the corrugated air cylinder 501 is compressed and ejected at high speed from the nozzle 512 through the one-way exhaust valve, the air guide hose 510, and the air delivery hose 513. When the linkage cam 506 rotates to the reset section, the compression spring 507 pushes the movable plate 504 back to its original position, and the corrugated air cylinder 501 rebounds. After being filtered and dried by the dehumidification box 508 and the dustproof and dehumidifying net 509, the external air enters the corrugated air cylinder 501 through the one-way intake valve, completing one intake and exhaust cycle. The nozzle 512 is located directly above the test head of the dial indicator 207, and continuously sprays clean and dry airflow onto the test surface of the stop wheel to remove surface impurities. 4. After the stop wheel has rotated stably, start the lifting motor 208. The lifting motor 208 drives the vertical adjusting screw 204 to rotate, and the vertical adjusting block 205 moves up and down at a constant speed along the vertical direction of the L-shaped testing frame 203. The limit sleeve 206 and the dial indicator 207 move up and down synchronously. The testing head of the dial indicator 207 is always in contact with the outer surface of the stop wheel. Under the dual motion of the circumferential rotation of the stop wheel and the axial movement of the dial indicator 207, the full-dimensional and full-circumferential circular runout of the entire cylindrical surface of the stop wheel is detected. The test data is displayed on the dial of the dial indicator 207 in real time, and the operator can directly read and record it to determine whether the circular runout of the stop wheel meets the standard requirements.

[0035] The structure of the present invention is described in accordance with the accompanying drawings, and the above are only specific embodiments of the present invention. However, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or changes made to the technical solution of the present invention should be within the scope of protection of the present invention.

Claims

1. A comprehensive inspection tool for automotive seatbelt stop wheels, comprising a fixed housing (1), characterized in that: The fixed shell (1) is provided with a detection mechanism (2) and a positioning mechanism (3) for fixing the stop wheel. The fixed shell (1) is provided with a drive mechanism (4) and a linkage dust removal mechanism (5). The detection mechanism (2) includes a horizontal adjustment screw (201) connected to a horizontal adjustment plate (202), an L-shaped detection frame (203) fixed on one side of the horizontal adjustment plate (202), a vertical adjustment screw (204) rotatably mounted on the L-shaped detection frame (203), a vertical adjustment block (205) threadedly connected to the vertical adjustment screw (204), and a limit sleeve (206) connected to one end of the vertical adjustment block (205), with a dial indicator (207) installed inside the limit sleeve (206). The positioning mechanism (3) includes a positioning cylinder (301) rotatably mounted on the fixed shell (1). The positioning cylinder (301) has arc-shaped positioning plates (302) on both sides for internally expanding and fixing the inner hole of the stop wheel. The positioning cylinder (301) corresponds to the detection head of the dial indicator (207).

2. The comprehensive inspection tool for automobile seat belt stop wheels according to claim 1, characterized in that: The positioning cylinder (301) has a rectangular mounting groove (311), and a positioning screw (303) is rotatably connected to the rectangular mounting groove (311). A movable block (304) is connected to the positioning screw (303). A first trapezoidal block (305) is fixedly connected to both sides of the movable block (304). A second trapezoidal block (306) is fixedly connected to both arc-shaped positioning plates (302). The end of the second trapezoidal block (306) away from the arc-shaped positioning plate (302) extends into the rectangular mounting groove (311). The first trapezoidal block (305) and the second trapezoidal block (306) correspond to each other and their inclined surfaces overlap.

3. The comprehensive inspection tool for automotive seat belt stop wheels according to claim 2, characterized in that: A reset spring (307) is provided on the second trapezoidal block (306). One end of the reset spring (307) is fixedly connected to the inner wall of the rectangular mounting groove (311). The rectangular mounting groove (311) has a rectangular through hole that matches the second trapezoidal block (306). The second trapezoidal block (306) is slidably connected to the inner wall of the rectangular through hole.

4. The comprehensive inspection tool for automotive seat belt stop wheels according to claim 3, characterized in that: The rectangular mounting groove (311) has guide grooves on its front and rear inner walls. The movable block (304) has guide sliders connected to its front and rear surfaces. The guide sliders are slidably connected to the inner walls of the guide grooves. Anti-slip rubber pads (308) are connected to the two arc-shaped positioning plates (302).

5. The comprehensive inspection tool for automotive seat belt stop wheels according to claim 1, characterized in that: Four support frames (309) are fixedly connected to the upper surface of the fixed shell (1). Support rollers (310) are rotatably connected to the top of the support frames (309). The four support rollers (310) are evenly distributed in a cross-shaped array on the surface of the fixed shell (1). The four support rollers (310) are symmetrically distributed around the positioning cylinder (301). The support rollers (310) are used to guide and support the lower end face of the stop wheel.

6. The comprehensive inspection fixture for automobile seat belt stop wheels according to claim 1, characterized in that: The linkage dust removal mechanism (5) includes a corrugated air cylinder (501) fixedly connected to a fixed shell (1). An extrusion plate (502) is fixedly connected to the end of the corrugated air cylinder (501). A linkage push rod (503) is fixedly connected to the surface of the extrusion plate (502). A movable plate (504) is fixedly connected to the linkage push rod (503). A rotating shaft (505) is rotatably connected to the fixed shell (1). A linkage cam (506) is fixedly connected to the rotating shaft (505). The linkage cam (506) corresponds to the movable plate (504) and overlaps with the surface of the movable plate (504). A compression spring (507) is sleeved on the linkage push rod (503).

7. The comprehensive inspection fixture for automobile seat belt stop wheels according to claim 6, characterized in that: The corrugated air cylinder (501) has an air inlet pipe fixedly embedded at its air inlet end, and a dehumidification box (508) is fixedly attached to the air inlet end of the air inlet pipe. A dustproof and dehumidifying mesh (509) is fixedly installed inside the dehumidification box (508). A duct hose (510) is fixedly connected to the exhaust end of the corrugated air cylinder (501). An extension bracket (511) is fixedly connected to the upper surface of the limiting sleeve (206). A jet nozzle (512) is fixedly connected to the surface of the extension bracket (511). A gas delivery hose (513) is fixedly connected to the air inlet end of the jet nozzle (512). The end of the gas delivery hose (513) away from the jet nozzle (512) extends downward into the interior of the fixed shell (1) and is fixedly connected to the output end of the duct hose (510).

8. The comprehensive inspection tool for automobile seat belt stop wheels according to claim 7, characterized in that: The nozzle (512) is located directly above the dial indicator (207) detection head. The limiting sleeve (206) has a bolt fixing hole, and a limiting bolt (209) is connected to the bolt fixing hole. The limiting bolt (209) is used to press against and limit the dial indicator (207). A lifting motor (208) is fixed on the L-shaped detection frame (203). The rotating shaft of the lifting motor (208) is connected to the vertical adjustment screw (204).

9. The comprehensive inspection fixture for automobile seat belt stop wheels according to claim 1, characterized in that: The drive mechanism (4) includes a drive motor (401) fixed on the fixed housing (1), the output end of the drive motor (401) is fixedly connected to a drive shaft, a drive gear (402) is fixedly connected to the drive shaft, the bottom end of the positioning cylinder (301) extends into the fixed housing (1) and is fixedly connected to a transmission shaft (403), a transmission gear (404) is fixedly connected to the transmission shaft (403), and a linkage gear (405) is fixedly connected to the rotating shaft (505). Both the linkage gear (405) and the drive gear (402) mesh with the transmission gear (404).

10. A method of using a comprehensive inspection tool for automotive seat belt stop wheels, applicable to the comprehensive inspection tool for automotive seat belt stop wheels as described in any one of claims 1-9, characterized in that: It includes the following steps: Step 1: First, use the positioning mechanism (3) to limit and fix the car seat belt stop wheel; Step 2: Then, use the drive mechanism (4) to drive the stop wheel to rotate horizontally; Step 3: Simultaneously, use the linkage dust removal mechanism (5) to remove dust and dry the detection surface of the stop wheel; Step 4: Finally, use the testing mechanism (2) to test the circular runout of the circumferential surface of the stop wheel.

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