Equipment for detecting surface magnetism of annular magnet element

Abstract

The utility model discloses a device for detecting the surface magnetism of an annular magnet element, which comprises a computer and a tester, the computer is connected with the tester through a data line, the tester comprises a multi-shaft transmission mechanism, a testing mechanism, a testing platform and a placing platform, and the multi-shaft transmission mechanism, the testing mechanism and the placing platform are all arranged above the testing platform. The testing mechanism comprises a laser sensor, a Hall probe and a mounting base, the laser sensor and the Hall probe are connected with one end of the mounting base, the other end of the mounting base is connected with the multi-axis transmission mechanism, the magnet element is arranged at the upper end of the placing platform, and the Hall probe and the laser sensor are arranged above the magnet element. According to the utility model, the distance between the laser emission point and the magnet element is measured through the laser sensor, and the height of the Hall probe is automatically corrected by software according to the measurement height requirement, so that the measurement distance between the Hall probe and the magnet element is always kept consistent.

Description

Technical Field

[0001] The utility model relates to the technical field of surface magnetism testing of magnetic elements, in particular to a device for detecting the surface magnetism of an annular magnetic element. Background Art

[0002] A magnetic element is an object that can generate a magnetic field. It is a magnetic dipole that can attract ferromagnetic materials such as iron, nickel, cobalt and other metals. Magnetic elements have the characteristics of like poles attracting and opposite poles repelling. This is the property of magnetic elements that we usually see. However, when the magnet is initially processed and formed, the magnetic element does not have magnetism. If it is to be used in industrial production, it is necessary to magnetize a single magnetic element. In order to ensure product quality, people need to test the magnetized magnetic elements to pick out those that are not magnetized or have unqualified magnetism. Surface magnetism is the most easily measured parameter in daily life. When the size of the magnet is certain, people often judge and compare the performance of the magnet by comparing the surface magnetism. For some magnets that are particularly large or small in size and special in shape, it is not suitable for conventional measurement. At this time, measuring the surface magnetism becomes very important.

[0003] The height of the two ends of an annular magnetic element is smaller than the height of the two sides, and one side of the annular magnetic element is concave. The measuring area of ​​the annular magnetic element is not flat. When the device detects the annular magnetic element, the probe and the annular magnetic element must always maintain a consistent measuring distance. However, it is not convenient in the prior art to continuously adjust the probe measuring distance according to the height of the annular magnetic element. Summary of the invention

[0004] The embodiment of the present application provides a device for detecting the surface magnetism of an annular magnetic element, measures the distance between the laser emission point and the magnetic element by a laser sensor, and automatically corrects the height of the Hall probe according to the measurement height requirement by software, so that the measurement distance between the Hall probe and the magnetic element is always kept consistent.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a device for detecting the surface magnetism of an annular magnetic element, comprising a computer and a tester, wherein the computer and the tester are connected via a data cable, the tester comprises a multi-axis transmission mechanism, a test mechanism, a test platform, and a placement platform, so that the multi-axis transmission mechanism, the test mechanism, and the placement platform are all arranged above the test platform, the test mechanism comprises a laser sensor, a Hall probe, and a mounting base, the laser sensor and the Hall probe are connected to one end of the mounting base, and the other end of the mounting base is connected to the multi-axis transmission mechanism, the magnetic element is placed at the upper end of the placement platform, and the Hall probe and the laser sensor are arranged above the magnetic element.

[0006] Compared with the prior art, the advantages of the utility model are:

[0007] The measurement area of ​​the magnetic element is not flat. According to the shape and structure data of the magnetic element, the software calculates the initial height and measurement trajectory of the Hall probe. According to the measurement height requirement, the software drives the mounting base through the multi-axis transmission mechanism to drive the Hall probe to move and scan. At the same time, the laser sensor emits a laser to the magnetic element to measure the distance between the laser emission point and the magnetic element. As the height of the measuring surface of the magnetic element changes, the distance between the laser emission point and the magnetic element also changes, and the height of the Hall probe also changes. The multi-axis transmission mechanism automatically corrects the height of the Hall probe to keep the measurement distance between the Hall probe and the magnetic element consistent at all times, and the magnetic element is detected by the magnetic sensor.

[0008] As an improvement, the multi-axis transmission mechanism includes three groups of transmission structures, which are respectively arranged in the X-axis direction, the Y-axis direction, and the Z-axis direction. The transmission structure includes a shell, a first motor, a screw, a nut, and a mounting seat. The screw is arranged inside the shell and is rotatably connected to the shell. The first motor is arranged on one side of the shell and connected to one end of the screw. The screw is threadedly connected to the nut, and one end of the nut is connected to the mounting seat. The transmission structure in the X-axis direction is arranged between the placement platform and the test platform. A mounting frame is provided above one end of the test platform. The rear end of the transmission structure in the Y-axis direction is connected to the mounting frame, the front end of the transmission structure in the Y-axis direction is connected to the rear end of the transmission structure in the Z-axis direction, and the front end of the transmission structure in the Z-axis direction is connected to the mounting base. The transmission structures in three directions are provided to facilitate the mounting base to drive the Hall probe to fully test the surface magnetism of the magnetic element. The screw transmission mechanism has small friction resistance, high sensitivity, no vibration at startup, and no creeping phenomenon at low speed, so the micro feed can be precisely controlled.

[0009] As an improvement, the testing mechanism also includes a mounting block, a second motor, and a rotating block. The rear end of the mounting block is connected to the front end of the mounting base, the second motor is arranged above the mounting block, and the rotating block is arranged below the mounting block. The second motor drives the rotating block to rotate, and the lower end of the rotating block is connected to the Hall probe. Since the measurement trajectory is a closed loop, when the Hall probe moves for testing, the Hall probe needs to be controlled to move and rotate at the same time according to the data calculated by the software. A second motor is provided to drive the rotating block to rotate. Since the rotating block is connected to the Hall probe, the Hall probe is driven to rotate.

[0010] As an improvement, a boss is provided at the upper end of the placement platform, and a first groove is provided on the boss. The shape of the first groove is adapted to the shape of the magnetic element. The lower end of the magnetic element is arranged inside the first groove. The lower end of the magnetic element is placed inside the second groove, thereby limiting the magnetic element so that the magnetic element does not produce radial movement when moving forward and backward.

[0011] As an improvement, a touch sensor is provided between the mounting block and the rotating block. When the Hall probe moves downward and touches the boss, the touch sensor transmits information to the computer. The computer controls the first motor of the transmission structure in the Z-axis direction to rotate, and then drives the mounting base to move up a set distance. A touch sensor is provided. After the Hall probe moves downward and touches the boss, it will move up to prevent the Hall probe from being damaged by continuous downward movement. When the upward movement distance is set, the rebound distance of the Hall probe is fixed, and the packaging distance of the Hall probe is also fixed, so that the distance between the Hall probe and the boss can be obtained.

[0012] As an improvement, the testing mechanism also includes a leveling knob and a rotating screw. The laser sensor is arranged at the lower end of the mounting block. A first protrusion is provided at the rear end of the mounting block. The leveling knob passes through the rear end of the mounting base and abuts against the upper end of the first protrusion. The rear end of the mounting block is fastened to the front end of the mounting base by the rotating screw. The leveling knob is moved up or down by turning the leveling knob with an Allen wrench, thereby changing the vertical distance between the third protrusion and the mounting base so that the protrusion remains perpendicular to the Hall probe and the laser sensor. After leveling is completed, the rear end of the mounting block is fastened to the front end of the mounting base by rotating the screw.

[0013] As an improvement, a fixing ring is provided at the rear end of the mounting base, and a threaded hole is provided inside the fixing ring. The leveling knob is threadedly connected to the threaded hole, and a fastening screw is passed through the fixing ring and abuts against the leveling knob for tightening. The leveling knob is threadedly connected to the threaded hole, which facilitates more precise leveling of the leveling knob; the leveling knob is further tightened by passing the fastening screw through the fixing ring and abutting against the leveling knob.

[0014] As an improvement, the transmission structure also includes a limit plate, and the mounting seat is provided with a limit groove. The limit plate passes through the interior of the limit groove and is connected to the shell. When the nut moves on the screw rod, the mounting seat moves accordingly. The limit plate can prevent the mounting seat from falling out during the movement.

[0015] As an improvement, a guide groove is provided on the inner wall of the shell, and guide strips matching the guide groove are provided on both sides of the nut, so as to play a guiding role when the nut slides inside the first shell.

[0016] As an improvement, guide rails are provided on both sides of the transmission structure in the X-axis direction, and the guide rails are arranged parallel to the transmission structure in the X-axis direction. A first slider is provided at the lower end of the placement platform, a second protrusion is provided at the upper end of the guide rail, and a second groove is provided at the lower end of the first slider. The shape of the second protrusion is matched with the shape of the second groove. Guide rails are provided on both sides of the transmission structure in the X-axis direction. When the placement platform moves back and forth, the second protrusion is abutted against the second groove, thereby ensuring the flatness and stability of the placement platform during movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0018] Figure 1 A schematic diagram of the overall structure of a device for detecting the surface magnetism of a ring-shaped magnetic element;

[0019] Figure 2 It is a schematic diagram of the test organization structure;

[0020] Figure 3 This is a schematic diagram of the test organization structure;

[0021] Figure 4 It is a cross-sectional schematic diagram of the driving structure;

[0022] Figure 5 It is a cross-sectional schematic diagram of the coordination between the placement platform and the first guide rail structure;

[0023] Figure 6 is a schematic diagram of the structure of a magnetic element;

[0024] Figure 7 This is a schematic diagram of the Hall probe's running trajectory.

[0025] The marks in the above figure are: 1. Computer; 2. Tester; 2.1. Multi-axis transmission mechanism; 2.1.1. Transmission structure; 2.1.1.1. Housing; 2.1.1.1.1. Guide groove; 2.1.1.2. First motor; 2.1.1.3. Screw rod; 2.1.1.4. Screw nut; 2.1.1.4.1. Guide bar; 2.1.1.5. Mounting seat; 2.1.1.5.1. Limiting groove; 2.1.1.6. Limiting plate; 2.2. Test mechanism; 2.2.1. Laser sensor; 2.2.2. Hall probe; 2.2.3 , mounting base; 2.2.3.1, fixing ring; 2.2.4, mounting block; 2.2.4.1, first protrusion; 2.2.5, second motor; 2.2.6, rotating block; 2.2.7, touch sensor; 2.2.8, leveling knob; 2.2.9, rotating screw; 2.3, test platform; 2.4, placement platform; 2.4.1, boss; 2.4.1.1, first groove; 2.4.2, first slider; 2.4.2.1, second groove; 2.5, mounting frame; 2.6, guide rail; 2.6.1, second protrusion; 3, magnetic element. DETAILED DESCRIPTION

[0026] In the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "planar direction", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] like Figure 1 to Figure 2 As shown, the test mechanism 2.2 includes a laser sensor 2.2.1, a Hall probe 2.2.2, a mounting base 2.2.3, a mounting block 2.2.4, a second motor 2.2.5, a rotating block 2.2.6, a touch sensor 2.2.7, a leveling knob 2.2.8, and a rotating screw 2.2.9. The rear end of the mounting block 2.2.4 is connected to the front end of the mounting base 2.2.3, and the second motor 2.2.5 is arranged on the mounting block 2.2. 4, the rotating block 2.2.6 is arranged below the mounting block 2.2.4, the second motor 2.2.5 drives the rotating block 2.2.6 to rotate, the lower end of the rotating block 2.2.6 is connected to the Hall probe 2.2.2, the touch sensor 2.2.7 is arranged between the mounting block 2.2.4 and the rotating block 2.2.6, when the Hall probe 2.2.2 moves down and touches the boss 2.4.1, the touch sensor 2.2.7 transmits the information The information is transmitted to the computer 1, and the computer 1 drives the first motor 2.1.1.2 of the transmission structure 2.1.1 in the Z-axis direction to rotate, and then drives the mounting base 2.2.3 to move up a set distance. The laser sensor 2.2.1 is arranged at the lower end of the mounting block 2.2.4, and the rear end of the mounting block 2.2.4 is provided with a first protrusion 2.2.4.1. The leveling knob 2.2.8 passes through the rear end of the mounting base 2.2.3 and abuts against the upper end of the first protrusion 2.2.4.1. The rear end of the mounting block 2.2.4 is fastened with the front end of the mounting base 2.2.3 by a rotating screw 2.2.9. The rear end of the mounting base 2.2.3 is provided with a fixing ring 2.2.3.1, and a threaded hole is provided inside the fixing ring 2.2.3.1. The leveling knob 2.2.8 is threadedly connected with the threaded hole, and is fastened by passing the fixing screw through the fixing ring 2.2.3.1 and abutting against the leveling knob 2.2.8.

[0028] like Figure 3As shown, a device for detecting the surface magnetism of an annular magnetic element comprises a computer 1 and a detector 2. The computer 1 is connected to the detector 2 via a data cable. The tester 2 comprises a multi-axis transmission mechanism 2.1, a test mechanism 2.2, a test platform 2.3 and a placement platform 2.4. Therefore, the multi-axis transmission mechanism 2.1, the test mechanism 2.2 and the placement platform 2.4 are all arranged above the test platform 2.3. The test mechanism 2.2 comprises a laser sensor 2.2.1, a Hall probe 2.2.2 and a mounting base 2.2.3. The laser sensor 2.2.1 and the Hall probe 2.2.2 are connected to one end of the mounting base 2.2.3, and the other end of the mounting base 2.2.3 is connected to the multi-axis transmission mechanism 2.1. The magnetic element 3 is placed on the upper end of the placement platform 2.4. The Hall probe 2.2.2 and the laser sensor 2.2.1 are arranged above the magnetic element 3.

[0029] The multi-axis transmission mechanism 2.1 includes three groups of transmission structures 2.1.1, and the three groups of transmission structures 2.1.1 are respectively arranged in the X-axis direction, the Y-axis direction, and the Z-axis direction. The transmission structure 2.1.1 in the X-axis direction is arranged between the placement platform 2.4 and the test platform 2.3. A mounting frame 2.5 is provided above one end of the test platform 2.3. The rear end of the transmission structure 2.1.1 in the Y-axis direction is connected to the mounting frame 2.5, the front end of the transmission structure 2.1.1 in the Y-axis direction is connected to the rear end of the transmission structure 2.1.1 in the Z-axis direction, and the front end of the transmission structure 2.1.1 in the Z-axis direction is connected to the mounting base 2.2.3.

[0030] The upper end of the placing platform 2.4 is provided with a boss 2.4.1, and the boss 2.4.1 is provided with a first groove 2.4.1.1, the shape of the first groove 2.4.1.1 is adapted to the shape of the magnetic element 3, and the lower end of the magnetic element 3 is arranged inside the first groove 2.4.1.1.

[0031] like Figure 4As shown, the transmission structure 2.1.1 includes a housing 2.1.1.1, a first motor 2.1.1.2, a screw rod 2.1.1.3, a nut 2.1.1.4, a mounting seat 2.1.1.5, and a limit plate 2.1.1.6. The screw rod 2.1.1.3 is arranged inside the housing 2.1.1.1 and is rotatably connected to the housing 2.1.1.1. The first motor 2.1.1.2 is arranged on one side of the housing 2.1.1.1 and is connected to one end of the screw rod 2.1.1.3. The screw rod 2.1.1.3 and the nut 2.1.1.4 is threadedly connected, one end of the nut 2.1.1.4 is connected to the mounting seat 2.1.1.5, the mounting seat 2.1.1.5 is provided with a limiting groove 2.1.1.5.1, the limiting plate 2.1.1.6 passes through the inside of the limiting groove 2.1.1.5.1 and is connected to the shell 2.1.1.1, the inner wall of the shell 2.1.1.1 is provided with a guide groove 2.1.1.1.1, and guide bars 2.1.1.4.1 adapted to the guide groove 2.1.1.1.1 are provided on both sides of the nut 2.1.1.4.

[0032] like Figure 5 As shown, guide rails 2.6 are provided on both sides of the transmission structure 2.1.1 in the X-axis direction, and the guide rails 2.6 are arranged parallel to the transmission structure 2.1.1 in the X-axis direction. A first slider 2.4.2 is provided at the lower end of the placement platform 2.4, a second protrusion 2.6.1 is provided at the upper end of the guide rail 2.6, and a second groove 2.4.2.1 is provided at the lower end of the first slider 2.4.2, and the shape of the second protrusion 2.6.1 is adapted to the shape of the second groove 2.4.2.1.

[0033] like Figure 6 As shown, the magnetic element 3 is ring-shaped, the heights of the two ends of the magnetic element 3 are smaller than the heights of the two sides, and one side of the magnetic element 3 is concave.

[0034] Use the hexagonal wrench to turn the leveling knob 2.2.8 to move it up or down, change the vertical distance between the first convex block 2.2.4.1 and the mounting base 2.2.3, so that the boss 2.4.1 is kept vertical to the Hall probe 2.2.2 and the laser sensor 2.2.1. After the adjustment is completed, the rear end of the mounting block 2.2.4 is fastened to the front end of the mounting base 2.2.3 by rotating the screw 2.2.9, and the leveling knob 2.2.8 is fastened by passing the connecting screw through the fixing ring 2.2.3.1 and abutting against the leveling knob 2.2.8, and the lower end of the magnetic element 3 is placed inside the first groove 2.4.1.1 of the boss 2.4.1, and the X-axis direction is passed. The transmission structure 2.1.1 drives the placement platform 2.4 to move toward the rear end, thereby causing the magnetic element 3 to move toward the rear end. At the same time, the transmission structure 2.1.1 in the Y-axis direction drives the mounting base 2.2.3 to move, thereby driving the Hall probe 2.2.2 to move, until the Hall probe 2.2.2 is above the boss 2.4.1. After the touch sensor 2.2.7 senses that the Hall probe 2.2.2 moves down and touches the boss 2.4.1, the Z-axis direction transmission structure 2.1.1 drives the mounting base 2.2.3 to drive the Hall probe 2.2.2 to rebound. The rebound distance of the Hall probe 2.2.2 is fixed, and the package distance of the Hall probe 2.2.2 is also fixed. In this way, The distance between the Hall probe 2.2.2 and the boss 2.4.1 is calculated, and the placement platform 2.4 is driven to move to the rear end by the transmission structure 2.1.1 in the X-axis direction, so that the magnetic element 3 moves to the rear end. At the same time, the Y-axis transmission structure 2.1.1 drives the mounting base 2.2.3 to move, thereby driving the Hall probe 2.2.2 to move, until the Hall probe 2.2.2 is above the rear end of the magnetic element 3. The height and measurement trajectory of the Hall probe 2.2.2 are calculated based on the shape and structure data of the magnetic element 3. As the transmission structure 2.1.1 in the X-axis direction continues to drive the magnetic element 3 to move to the rear end, the Hall probe 2.2.2 is driven to move by the Y-axis transmission structure 2.1.1. Move one side, always keep the Hall probe 2.2.2 at the upper part corresponding to the annular element, and at the same time, as the measuring surface of the magnetic element 3 changes in height, the Hall probe 2.2.2 also follows it and is driven by the Z-axis direction transmission structure 2.1.1 to move up and down to always keep the measurement distance consistent, and because the measurement track is a closed ring, as shown in the figure, the probe scans with the X-axis as the moving direction, and the Hall probe 2.2.2 is controlled by the program according to the data calculated by the software while moving, while the second motor 2.2.5 drives the rotating block 2.2.6 to rotate the angle of the Hall probe 2.2.2, ensuring that the X-axis is always in the moving forward direction, and the surface magnetism of the magnetic element 3 is tested by the Hall probe 2.2.2.

[0035] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A device for detecting the surface magnetism of a ring-shaped magnetic element, comprising a computer (1) and a tester (2), wherein the computer (1) and the tester (2) are connected via a data line, and characterized in that: The tester (2) comprises a multi-axis transmission mechanism (2.1), a test mechanism (2.2), a test platform (2.3), and a placement platform (2.4), so that the multi-axis transmission mechanism (2.1), the test mechanism (2.2), and the placement platform (2.4) are all arranged above the test platform (2.3); the test mechanism (2.2) comprises a laser sensor (2.2.1), a Hall probe (2.2.2), and a mounting base (2.2.3); the laser sensor (2.2.1) and the Hall probe (2.2.2) are connected to one end of the mounting base (2.2.3); the other end of the mounting base (2.2.3) is connected to the multi-axis transmission mechanism (2.1); the magnetic element (3) is placed on the upper end of the placement platform (2.4); the Hall probe (2.2.2) and the laser sensor (2.2.1) are arranged above the magnetic element (3).

2. The device for detecting the surface magnetism of an annular magnetic element according to claim 1, characterized in that: The multi-axis transmission mechanism (2.1) comprises three sets of transmission structures ( 2.1.1), the three groups of transmission structures (2.1.1) are respectively arranged in the X-axis direction, the Y-axis direction, and the Z-axis direction, the transmission structure (2.1.1) comprises a housing (2.1.1.1), a first motor (2.1.1.2), a screw rod (2.1.1.3), a nut (2.1.1.4), and a mounting seat (2.1.1.5), the screw rod (2.1.1.3) is arranged inside the housing (2.1.1.1) and is rotationally connected to the housing (2.1.1.1), the first motor (2.1.1.2) is arranged on one side of the housing (2.1.1.1) and is connected to one end of the screw rod (2.1.1.3), the screw rod (2.1.1.3) is arranged on the one side of the housing (2.1.1.1) and is connected to one end of the screw rod (2.1.1.3), and the screw rod (2.1.1.1) is arranged on the one side of the housing (2.1.1.1) and is connected to one end of the screw rod (2.1.1.3). .3) is threadedly connected to the nut (2.1.1.4), one end of the nut (2.1.1.4) is connected to the mounting seat (2.1.1.5), the transmission structure (2.1.1) in the X-axis direction is arranged between the placing platform (2.4) and the test platform (2.3), a mounting frame (2.5) is arranged above one end of the test platform (2.3), the rear end of the transmission structure (2.1.1) in the Y-axis direction is connected to the mounting frame (2.5), the front end of the transmission structure (2.1.1) in the Y-axis direction is connected to the rear end of the transmission structure (2.1.1) in the Z-axis direction, and the front end of the transmission structure (2.1.1) in the Z-axis direction is connected to the mounting base (2.2.3).

3. The device for detecting the surface magnetism of an annular magnetic element according to claim 1, characterized in that: The testing mechanism (2.2) further comprises a mounting block (2.2.4), a second motor (2.2.5), and a rotating block (2.2.6); the rear end of the mounting block (2.2.4) is connected to the front end of the mounting base (2.2.3); the second motor (2.2.5) is arranged above the mounting block (2.2.4); the rotating block (2.2.6) is arranged below the mounting block (2.2.4); the second motor (2.2.5) drives the rotating block (2.2.6) to rotate; and the lower end of the rotating block (2.2.6) is connected to the Hall probe (2.2.2).

4. The device for detecting the surface magnetism of an annular magnetic element according to claim 3, characterized in that: The upper end of the placement platform (2.4) is provided with a boss (2.4.1), the boss (2.4.1) is provided with a first groove (2.4.1.1), the shape of the first groove (2.4.1.1) is adapted to the shape of the magnetic element (3), and the lower end of the magnetic element (3) is arranged inside the first groove (2.4.1.1).

5. The device for detecting the surface magnetism of an annular magnetic element according to claim 4, characterized in that: A touch sensor (2.2.7) is provided between the mounting block (2.2.4) and the rotating block (2.2.6); when the Hall probe (2.2.2) moves downward and touches the boss (2.4.1), the touch sensor (2.2.7) transmits information to the computer (1); the computer (1) controls the first motor (2.1.1.2) of the transmission structure (2.1.1) in the Z-axis direction to rotate, and then drives the mounting base (2.2.3) to move upward a set distance.

6. The device for detecting the surface magnetism of an annular magnetic element according to claim 3, characterized in that: The testing mechanism (2.2) further comprises a leveling knob (2.2.8) and a rotating screw (2.2.9); the laser sensor (2.2.1) is arranged at the lower end of the mounting block (2.2.4); a first protrusion (2.2.4.1) is arranged at the rear end of the mounting block (2.2.4); the leveling knob (2.2.8) passes through the rear end of the mounting base (2.2.3) and abuts against the upper end of the first protrusion (2.2.4.1); and the rear end of the mounting block (2.2.4) is fastened to the front end of the mounting base (2.2.3) by means of the rotating screw (2.2.9).

7. The device for detecting the surface magnetism of an annular magnetic element according to claim 6, characterized in that: A fixing ring (2.2.3.1) is provided at the rear end of the mounting base (2.2.3), a threaded hole is provided inside the fixing ring (2.2.3.1), the leveling knob (2.2.8) is threadedly connected to the threaded hole, and a fixing screw is passed through the fixing ring (2.2.3.1) to abut against the leveling knob (2.2.8) for tightening.

8. The device for detecting the surface magnetism of an annular magnetic element according to claim 2, characterized in that: The transmission structure (2.1.1) further comprises a limit plate (2.1.1.6), and the mounting seat (2.1.1.5) is provided with a limit groove ( 2.1.1.5.1), the limit plate (2.1.1.6) passes through the limit slot ( The interior of 2.1.1.5.1) is connected to the shell (2.1.1.1).

9. The device for detecting the surface magnetism of an annular magnetic element according to claim 2, characterized in that: The inner wall of the housing (2.1.1.1) is provided with a guide groove ( 2.1.1.1.1), guide bars (2.1.1.4.1) adapted to the guide grooves (2.1.1.1.1) are provided on both sides of the nut (2.1.1.4).

10. The device for detecting the surface magnetism of an annular magnetic element according to claim 2, characterized in that: Guide rails (2.6) are provided on both sides of the transmission structure (2.1.1) in the X-axis direction, and the guide rails (2.6) are arranged in parallel with the transmission structure (2.1.1) in the X-axis direction; a first sliding block (2.4.2) is provided at the lower end of the placement platform (2.4); a second convex block (2.6.1) is provided at the upper end of the guide rail (2.6); a second groove (2.4.2.1) is provided at the lower end of the first sliding block (2.4.2); and the shape of the second convex block (2.6.1) is adapted to the shape of the second groove (2.4.2.1).

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