Bolt looseness detection device

Abstract

The utility model discloses a bolt looseness detection device which comprises an equipment shell, a circumferential driving mechanism, a torque transmission mechanism and an execution mechanism, the equipment shell is composed of an upper shell body and a cover plate which are fixedly connected through a bolt, and the cover plate is located on the lower surface of the upper shell body. The circumferential driving mechanism comprises a driving straight gear installed in the center of the interior of the upper shell and five driven straight gears arranged around the driving straight gear. Compared with the prior art, the utility model has the beneficial effects that a meshing structure of the central driving straight gear and the five groups of driven gears is adopted to realize that a single pneumatic motor drives multi-station synchronous operation, and when the torque is greater than the design value of the magnetic coupling, the magnetic coupling does not transmit power, so that the bolt can be prevented from being excessively tightened; and compared with the traditional single-time one-by-one detection, the automobile hub bolt detection efficiency is greatly improved by using five-station parallel detection.

Description

Technical Field

[0001] This utility model relates to the field of bolt detection technology, and in particular to a bolt loosening detection device. Background Technology

[0002] In automobile production, bolt tightness inspection is a critical quality control point in the final assembly stage. The traditional method involves using a torque wrench to check each bolt individually. However, we have found that the bolts on automobile wheel hubs are equidistantly distributed around the hub's axis, and there are five of them. Checking each bolt individually with a torque wrench is too time-consuming and inefficient. To address these shortcomings, we propose a bolt loosening detection device. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a bolt loosening detection device.

[0004] To address the problems existing in the prior art, the present invention adopts the following technical solution:

[0005] A bolt loosening detection device, comprising:

[0006] The equipment housing consists of an upper shell and a cover plate that are bolted together, with the cover plate located on the lower surface of the upper shell;

[0007] A circumferential drive mechanism includes a drive spur gear installed at the center inside the upper housing and five driven spur gears arranged around it. Each driven spur gear meshes with the drive spur gear. A pneumatic motor is fixedly installed on the upper surface of the upper housing.

[0008] A torque transmission mechanism, comprising a magnetic coupling fixed to the bottom of each driven spur gear, with a limiting cylinder connected below each magnetic coupling, and a cross-shaped limiting groove provided on the inner wall of the limiting cylinder;

[0009] The actuator includes five guide cylinders distributed around the circumference of the cover plate. The surface of the guide cylinders is rotatably connected to the lower surface of the cover plate via bearings. Each guide cylinder has a cross-shaped limiting block at its top that is adapted to the cross-shaped limiting groove. A guide rod with a limiting slider is slidably arranged inside each guide cylinder. The bottom of the guide rod is connected to an external hexagonal sleeve, and a compression spring acting on the guide rod is provided inside the guide cylinder.

[0010] Preferably, the five limiting cylinders and guide cylinders are connected by a cross-shaped limiting block and a cross-shaped limiting groove to form a detachable transmission connection, wherein the depth of the cross-shaped limiting groove is greater than the height of the cross-shaped limiting block.

[0011] Preferably, a limiting groove is formed on the inner wall of the guide cylinder, and a limiting slider provided on the surface of the guide rod slides in cooperation with the limiting groove on the inner wall of the guide cylinder.

[0012] Preferably, the top end of the compression spring abuts against the inner stepped surface of the guide cylinder, and the bottom end abuts against the upper surface of the limiting slider.

[0013] Preferably, the bottom edge of the external hexagonal sleeve has a rounded corner structure.

[0014] Preferably, two handles are symmetrically arranged on the surface of the upper housing.

[0015] Preferably, the air inlet end of the pneumatic motor is provided with an air pipe connector.

[0016] Preferably, the shaft end of the drive spur gear is fixedly connected to the output end of the pneumatic motor.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. The system adopts a meshing structure of a central drive spur gear and five sets of driven gears to achieve synchronous operation of multiple stations driven by a single pneumatic motor. When the torque exceeds the design value of the magnetic coupling, the magnetic coupling will no longer transmit power, thus avoiding over-tightening of bolts. This allows for simultaneous detection and tightening of loose bolts. The five-station parallel detection greatly improves the efficiency of automotive wheel hub bolt inspection compared to the traditional single-step inspection.

[0019] 2. After the hexagonal socket contacts the bolt, continued rotation will compress the compression spring, pushing the guide rod to slide. The rounded corner structure of the hexagonal socket guides it to automatically center and insert the bolt. The compression spring provides insertion pressure and absorbs axial vibration, ensuring a smooth tightening process. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present invention. The illustrative embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an undue limitation. In the drawings:

[0021] Figure 1 This is a three-dimensional first-view schematic diagram of the present invention;

[0022] Figure 2 This is a three-dimensional second-view schematic diagram of the present invention;

[0023] Figure 3 This is a cross-sectional view of the present invention;

[0024] Figure 4 This is a top sectional view of the circumferential drive mechanism of this utility model;

[0025] Figure 5 This is a three-dimensional structural diagram of the cover plate of this utility model;

[0026] Figure 6 for Figure 3 Enlarged structural diagram at point A in the middle.

[0027] The components in the diagram are numbered as follows: 10 Upper housing, 11 Cover plate, 12 Handle, 20 Drive spur gear, 21 Driven spur gear, 22 Pneumatic motor, 23 Air hose plug, 30 Magnetic coupling, 31 Limiting cylinder, 40 Guide cylinder, 41 Cross-shaped limiting block, 42 ​​Limiting slider, 43 Guide rod, 44 External hexagonal sleeve, 45 Compression spring. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0029] Please see Figure 1-6 This utility model provides a technical solution: a bolt loosening detection device, comprising: a device housing, a circumferential drive mechanism, a torque transmission mechanism, and an actuator.

[0030] The equipment housing consists of an upper housing 10 and a cover plate 11 that are fixedly connected by bolts. The cover plate 11 is located on the lower surface of the upper housing 10. Two handles 12 are symmetrically arranged on the surface of the upper housing 10 to ensure balanced force during operation.

[0031] The circumferential drive mechanism includes a drive spur gear 20 installed at the center inside the upper housing 10, and five driven spur gears 21 rotatably connected inside the upper housing 10. Each driven spur gear 21 meshes with the drive spur gear 20. A pneumatic motor 22 is fixedly installed on the upper surface of the upper housing 10. The air inlet end of the pneumatic motor 22 is provided with an air pipe connector 23, which is connected to an external air source. The shaft end of the drive spur gear 20 is fixedly connected to the output end of the pneumatic motor 22. The pneumatic motor 22 drives the drive spur gear 20 to rotate, thereby driving the five driven spur gears 21 to rotate synchronously.

[0032] The torque transmission mechanism includes a magnetic coupling 30 fixed to the bottom of each driven spur gear 21. The magnetic coupling 30 can be set with a torque threshold (this device is prior art and will not be described in detail). Each magnetic coupling 30 is connected to a limiting cylinder 31 below it. The inner wall of the limiting cylinder 31 is provided with a cross-shaped limiting groove.

[0033] The actuator includes five guide cylinders 40 distributed around the circumference of the cover plate 11. The surface of the guide cylinders 40 is rotatably connected to the lower surface of the cover plate 11 via bearings. Each guide cylinder 40 has a cross-shaped limiting block 41 at its top that is adapted to the cross-shaped limiting groove. The five limiting cylinders 31 and the guide cylinders 40 are connected to each other by the cross-shaped limiting block 41 and the cross-shaped limiting groove in a detachable transmission connection. The depth of the cross-shaped limiting groove is greater than the height of the cross-shaped limiting block 41.

[0034] When the upper housing 10 and the cover plate 11 are installed as a whole, the cross-shaped limiting block 41 will be inserted into the cross-shaped limiting groove, so that the magnetic coupling 30 and the guide cylinder 40 can be assembled as a whole. The outer hexagonal sleeve 44 is connected to the magnetic coupling 30 through the guide rod 43 and receives the rotational torque from the pneumatic motor 22 (the pneumatic motor 22 can be equipped with a speed regulating valve or pressure feedback control to keep the output torque stable).

[0035] Each guide cylinder 40 has a guide rod 43 with a limiting slider 42 slidably installed inside. The inner wall of the guide cylinder 40 is provided with a limiting groove. The limiting slider 42 on the surface of the guide rod 43 slides in cooperation with the limiting groove on the inner wall of the guide cylinder 40. The bottom of the guide rod 43 is connected to an external hexagonal sleeve 44. A compression spring 45 acting on the guide rod 43 is provided inside the guide cylinder 40. The top end of the compression spring 45 abuts against the inner stepped surface of the guide cylinder 40, and the bottom end abuts against the upper surface of the limiting slider 42. The bottom edge of the external hexagonal sleeve 44 is provided with a rounded corner structure. The rounded corner structure at the bottom of the external hexagonal sleeve 44 can guide the external hexagonal sleeve 44 to quickly align with the bolt.

[0036] After the external hexagonal sleeve 44 is inserted into the bolt on the car wheel hub, the output shaft of the pneumatic motor 22 drives the drive spur gear 20 to rotate, and then drives the five driven spur gears 21 to rotate synchronously through gear meshing. At this time, the magnetic coupling 30 transmits torque to the limit cylinder 31. When the bolt is loose and not tightened, the guide cylinder 40 can drive the external hexagonal sleeve 44 to tighten the bolt. When the torque is greater than the design value of the magnetic coupling 30 (this design value is the torque after the bolt is tightened), the magnetic coupling 30 will no longer transmit power, thereby avoiding over-tightening of the bolt. In addition, the loose bolt can be detected and tightened at the same time.

[0037] When the external hexagonal socket 44 contacts the bolt, continued rotation will compress the compression spring 45, pushing the guide rod 43 to slide. The rounded corner structure of the external hexagonal socket 44 guides it to automatically center and insert the bolt. The compression spring 45 provides insertion pressure and absorbs axial vibration, ensuring a smooth tightening process.

[0038] Specifically, the working principle and operation method of this utility model are as follows:

[0039] Power input: The pneumatic motor 22 drives the central drive spur gear 20 to rotate through an external air source, and synchronously drives the five surrounding driven spur gears 21 to rotate through gear meshing.

[0040] Torque transmission path: The limiting cylinder 31 is detachably connected to the cross-shaped limiting block 41 at the top of the guide cylinder 40 through the cross-shaped limiting groove to form a transmission link. The magnetic coupling 30 transmits the torque to the limiting cylinder 31, and then drives the outer hexagonal sleeve 44 to rotate through the guide cylinder 40.

[0041] Actuator operation: The bottom of the guide rod 43 is connected to the external hexagonal sleeve 44, and the bottom of the external hexagonal sleeve 44 is rounded to assist in the automatic alignment of the bolt.

[0042] Adaptive insertion: Align the device with the hub bolt. After the outer hexagonal sleeve 44 contacts the bolt, the pneumatic motor 22 continues to drive, and the compression spring 45 is pressed to push the guide rod 43 to slide. The rounded corners of the outer hexagonal sleeve 44 guide the outer hexagonal sleeve 44 to quickly align with the bolt.

[0043] Synchronous detection: Five external hexagonal sockets 44 are inserted into the bolts at the same time. If a bolt is not tightened due to insufficient torque, the corresponding guide cylinder 40 drives the external hexagonal socket 44 to rotate and gradually tighten it to the preset torque.

[0044] Overload protection: When the tightening torque reaches the design threshold of the magnetic coupling 30, the magnetic coupling 30 disconnects the power transmission to prevent over-tightening, while other bolt paths continue to work.

[0045] Multiple bolt misalignment: The compression spring 45 allows the guide rod 43 to extend and retract axially, and the external hexagonal sleeve 44 rotates to automatically adjust the position, ensuring that all bolts are eventually aligned.

[0046] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art based on the technical solution and concept of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bolt loosening detection device characterized by comprising: include: The equipment housing is composed of an upper housing (10) and a cover plate (11) that are fixedly connected by bolts, and the cover plate (11) is located on the lower surface of the upper housing (10); A circumferential drive mechanism includes a drive spur gear (20) installed at the center inside the upper housing (10) and five driven spur gears (21) arranged around it. Each driven spur gear (21) meshes with the drive spur gear (20). A pneumatic motor (22) is fixedly installed on the upper surface of the upper housing (10). The torque transmission mechanism includes a magnetic coupling (30) fixed to the bottom of each driven spur gear (21), and a limiting cylinder (31) connected below each magnetic coupling (30). The inner wall of the limiting cylinder (31) is provided with a cross-shaped limiting groove. The actuator includes five guide cylinders (40) distributed around the circumference of the cover plate (11). The surface of the guide cylinder (40) is rotatably connected to the lower surface of the cover plate (11) through bearings. Each guide cylinder (40) has a cross-shaped limiting block (41) at the top that is adapted to the cross-shaped limiting groove. Each guide cylinder (40) has a guide rod (43) with a limiting slider (42) slidably arranged inside. The bottom of the guide rod (43) is connected to an external hexagonal sleeve (44), and a compression spring (45) acting on the guide rod (43) is provided inside the guide cylinder (40).

2. A bolt loosening detection device according to claim 1, characterized in that: The five limiting cylinders (31) and the guide cylinder (40) are connected by a cross-shaped limiting block (41) and a cross-shaped limiting groove to form a detachable transmission connection. The depth of the cross-shaped limiting groove is greater than the height of the cross-shaped limiting block (41).

3. A bolt loosening detection device according to claim 1, characterized in that: The inner wall of the guide cylinder (40) is provided with a limiting groove, and the limiting slider (42) provided on the surface of the guide rod (43) slides in cooperation with the limiting groove on the inner wall of the guide cylinder (40).

4. A bolt loosening detection device according to claim 1, characterized in that: The top end of the compression spring (45) abuts against the inner stepped surface of the guide cylinder (40), and the bottom end abuts against the upper surface of the limiting slider (42).

5. A bolt loosening detection device according to claim 1, characterized in that: The bottom edge of the external hexagonal sleeve (44) is provided with a rounded corner structure.

6. A bolt loosening detection device according to claim 1, characterized in that: The upper housing (10) has two handles (12) symmetrically arranged on its surface.

7. A bolt loosening detection device according to claim 1, characterized in that: The air inlet of the pneumatic motor (22) is provided with an air pipe connector (23).

8. The bolt loosening detection device according to claim 1, characterized in that: The shaft end of the drive spur gear (20) is fixedly connected to the output end of the pneumatic motor (22).

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