Electromagnetic heating roller surface defect detection device

Abstract

The invention relates to the technical field of defect detection, and discloses an electromagnetic heating roller surface defect detection device which comprises a thickness gauge body, a probe located below the thickness gauge body, a display screen and operation keys, the display screen and the operation keys are installed on the thickness gauge body, the lower end of the thickness gauge body is connected with a supporting assembly, and the lower end of the supporting assembly is connected with the probe. The outer side of the supporting assembly is connected with an elastic assembly, the lower end of the elastic assembly is connected with a marking assembly, the marking assembly is located on the outer side of the probe, the lowest point of the marking assembly is lower than the lowest point of the probe, the two sides of the outer wall of the thickness gauge body are connected with rotating assemblies, and the lower ends of the two rotating assemblies are connected with a protection assembly at the same time. According to the surface defect detection device for the electromagnetic heating roller, when the probe performs defect detection on a coating on the surface of the electromagnetic heating roller, a mark can be marked at a detection position on the surface of the electromagnetic heating roller through the marking assembly at the moment of detection, so that subsequent recording and searching are facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of defect detection, in particular to a device for detecting surface defects of an electromagnetic heating roller. Background Art

[0002] Electromagnetic induction heating roller is a device that uses the principle of electromagnetic induction to heat metal objects (mainly rollers). In order to ensure the performance and service life of the heating roller, it is often necessary to regularly detect the surface defects of the heating roller (such as scratches, cracks, oxide layers, uneven coatings, etc.). The existing detection of uneven coatings mostly uses coating thickness gauges.

[0003] The patent with the current announcement number CN221976060U discloses a portable coating thickness gauge, including a housing box, a mounting cavity provided in the housing box, a disassembly push groove provided in the mounting cavity, a push mechanism provided in the push groove, a thickness gauge body connected in the mounting cavity, a disassembly mechanism matched with the thickness gauge body provided at the upper end of the mounting cavity, limiting grooves provided at the left and right ends of the mounting cavity, a limiting mechanism matched with the thickness gauge body provided in the limiting groove, and a plug-in slot matched with the limiting mechanism provided on the thickness gauge body. A portable coating thickness gauge can firmly restrict the thickness gauge body in the housing box through the cooperation between the limiting mechanism, the push mechanism and the disassembly mechanism, so that the entire thickness gauge is easy to carry, and at the same time, through the cooperation between the push mechanism and the disassembly mechanism, the thickness gauge can be quickly disassembled and taken out for maintenance, thereby improving the maintenance efficiency of the thickness gauge.

[0004] However, the above-mentioned coating thickness gauge still has the following problems in actual use: When the coating thickness gauge is testing the surface coating of the electromagnetic heating roller, in order to ensure data accuracy and subsequent analysis and comparison, it is often necessary to test at multiple positions of the heating roller. However, the current coating thickness gauge does not have a marking function, which means that each time a place is tested, it is necessary to mark it separately with a marker pen, which not only reduces the detection speed, but may also cause deviations in the marking points. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides an electromagnetic heating roller surface defect detection device to solve the problem that the current coating thickness gauge does not have a marking function.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for detecting surface defects of an electromagnetic heating roller, comprising a thickness gauge body, a probe located below the thickness gauge body, a display screen and operation buttons installed on the thickness gauge body, a support assembly connected to the lower end of the thickness gauge body, a lower end of the support assembly connected to the probe, an elastic assembly connected to the outer side of the support assembly, a marking assembly connected to the lower end of the elastic assembly, the marking assembly located on the outer side of the probe, and a lowest point of the marking assembly is lower than the lowest point of the probe, rotating assemblies are connected to both sides of the outer wall of the thickness gauge body, the lower ends of the two rotating assemblies are simultaneously connected to a protective assembly, the lower end of the protective assembly is connected to two cleaning assemblies, and the elastic assembly, the marking assembly and the probe are all located inside the protective assembly.

[0007] Furthermore, the support assembly includes a support column and a connecting column, the upper end of the support column is fixedly connected to the lower end of the thickness gauge body, the lower end of the support column is fixedly connected to the upper end of the connecting column, a connecting port is provided on the upper surface of the probe, the outer wall of the lower end of the connecting column is threadedly connected to the inner wall of the connecting port, and the outer wall of the support column is connected to the elastic assembly.

[0008] Furthermore, the elastic component includes a support box and a push spring. A sleeve is opened through the center of the upper surface of the support box, and a spring cavity is opened on the bottom surface of the support box. The inner wall of the upper end of the sleeve is fixedly connected to the outer wall of the lower end of the support column. The push spring is located in the spring cavity, and the upper end of the push spring is fixedly connected to the top surface of the spring cavity, and the lower end of the push spring is connected to the marking component.

[0009] Furthermore, the marking component includes a liquid storage box, marking cotton and a leak-proof strip. The liquid storage box is located in the spring cavity. The outer wall of the upper end of the liquid storage box is slidably connected to the inner wall of the spring cavity. The bottom surface of the liquid storage box is provided with a liquid storage cavity. The outer wall of the upper end of the leak-proof strip is fixedly connected to the inner wall at the opening of the liquid storage cavity. The outer wall of the lower end of the leak-proof strip is fixedly connected to the upper end of the marking cotton. The liquid storage box, marking cotton and leak-proof strip are all located on the outside of the probe, and the lowest surface of the marking cotton is lower than the lowest surface of the probe.

[0010] Furthermore, an anti-slip groove is provided on the inner wall of the spring cavity, an anti-slip plate is fixedly connected to the upper surface of the outer wall of the liquid storage box, and the outer wall of the anti-slip plate is slidably connected to the inner wall of the anti-slip groove.

[0011] Furthermore, the rotating assembly includes a rotating shaft, an L-shaped plate and two support blocks, one end of the two support blocks are fixedly connected to the side walls of the thickness gauge body, the two ends of the rotating shaft are respectively rotatably connected to the inner walls of the two support blocks, the upper end of the L-shaped plate is sleeved and fixedly connected to the middle part of the rotating shaft, and the lower end of the L-shaped plate is connected to the protective assembly.

[0012] Furthermore, the protective component includes two semicircular protective boxes, and the two semicircular protective boxes form a complete circle. A storage cavity is opened on the adjacent side of the two semicircular protective boxes, and the elastic component, the marking component and the probe are all located in the two storage cavities. The upper surfaces of the two semicircular protective boxes are penetrated by a bayonet connected to the storage cavity. The two bayonet holes form a circle, and this circle is sleeved and slidably connected to the outer wall of the support column. The bottom surfaces of the outer walls of the two semicircular protective boxes are respectively connected to the two cleaning components.

[0013] Furthermore, the cleaning component includes Velcro and wiping cotton, the upper surface of the Velcro is fixedly connected to the bottom surface of the outer wall of the semicircular protective box, and the bottom surface of the Velcro is bonded to the upper surface of the wiping cotton.

[0014] Furthermore, a clamping strip is fixedly connected to one side of one semicircular protective box close to the other semicircular protective box, a clamping slot is provided on the side wall of the other semicircular protective box, and an outer wall of the clamping strip is slidably connected to an inner wall of the clamping slot.

[0015] Furthermore, magnets are embedded and fixedly connected to the inner walls of the two L-shaped plates near one end of the rotating shaft, and two iron blocks are fixedly connected to the outer walls on both sides of the thickness gauge body, and the magnets are matched and aligned with the iron blocks.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The electromagnetic heating roller surface defect detection device is provided with a support component, an elastic component and a marking component between the thickness gauge body and the probe. When the probe detects defects on the coating on the surface of the electromagnetic heating roller, the marking component can mark the detection position on the surface of the electromagnetic heating roller at the moment of detection, thereby facilitating subsequent recording and searching.

[0017] This electromagnetic heating roller surface defect detection device, by arranging two rotating components on both sides of the thickness gauge body, and connecting the protection component through the two rotating components, can protect the probe when the thickness gauge body has not yet detected the surface of the electromagnetic heating roller, thereby reducing the probability of probe damage.

[0018] This electromagnetic heating roller surface defect detection device, by arranging a cleaning component below the protective component, can wipe off floating dust on the surface of the electromagnetic heating roller before detecting the surface of the electromagnetic heating roller, thereby reducing the influence of the floating dust on the detection data. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall appearance of the present invention; Figure 2 This is a schematic diagram of the overall appearance of the rotating assembly of the present invention after it is opened; Figure 3It is a detailed connection diagram of the support component, the elastic component and the marking component of the present invention; Figure 4 For the present invention Figure 3 Exploded diagram of each component in the diagram; Figure 5 The present invention is based on Figure 3 A schematic cross-sectional view of the liquid storage box; Figure 6 It is a detailed connection diagram of the rotating assembly, the protection assembly and the cleaning assembly of the present invention; Figure 7 For the present invention Figure 6 Schematic diagram of each component from another perspective.

[0020] In the figure: 1. Thickness gauge body; 2. Display screen; 3. Operation button; 4. Support block; 5. Rotating shaft; 6. L-shaped plate; 7. Semicircular protective box; 8. Velcro; 9. Wiping cotton; 10. Magnet; 11. Iron block; 12. Probe; 13. Support box; 14. Liquid storage box; 15. Marking cotton; 16. Spring cavity; 17. Anti-slip groove; 18. Push spring; 19. Anti-slip plate; 20. Connecting column; 21. Connecting port; 22. Liquid storage cavity; 23. Leak-proof strip; 24. Card slot; 25. Card strip; 26. Support column; 27. Sleeve mouth; 28. Card mouth; 29. ​​Storage cavity. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] See also Figure 1-Figure 7 A device for detecting surface defects of an electromagnetic heating roller comprises a thickness gauge body 1, a probe 12 located below the thickness gauge body 1, a display screen 2 and an operation button 3 installed on the thickness gauge body 1, a support assembly is connected to the lower end of the thickness gauge body 1, the lower end of the support assembly is connected to the probe 12, an elastic assembly is connected to the outer side of the support assembly, a marking assembly is connected to the lower end of the elastic assembly, the marking assembly is located on the outer side of the probe 12, and the lowest point of the marking assembly is lower than the lowest point of the probe 12, rotating assemblies are connected to both sides of the outer wall of the thickness gauge body 1, the lower ends of the two rotating assemblies are simultaneously connected to a protective assembly, the lower end of the protective assembly is connected to two cleaning assemblies, and the elastic assembly, the marking assembly and the probe 12 are all located inside the protective assembly.

[0023] The electromagnetic heating roller surface defect detection device in the present invention is similar in structure to the existing electromagnetic heating roller surface defect detection device, such as the coating thickness gauge PosiTector 6000 F1. Figures 1 to 7As shown, the electromagnetic heating roller surface defect detection device of the present invention can be used in the following steps: When defect detection of the coating on the surface of the electromagnetic heating roller is required, the inspector first manually holds the thickness gauge body 1, and then places the cleaning component against the surface of the electromagnetic heating roller to wipe off the floating dust on the surface of the point to be inspected to avoid affecting the inspection data.

[0024] Then the inspector manually rotates the two rotating components toward the two sides of the thickness gauge body 1, and then the protective component and the two cleaning components can be turned over together, so that the elastic component, the marking component and the probe 12 located inside the protective component can be exposed.

[0025] Then the operator holds the thickness gauge body 1 again and places the probe 12 against the point to be tested, and then the coating test can be performed on the test point.

[0026] During the detection process of the probe 12, because the marking component is lower than the position of the probe 12, it will also be against the surface of the electromagnetic heating roller before the probe 12 contacts the surface of the electromagnetic heating roller, so that marks can be placed around the detection point. When the probe 12 is taken away, the mark can be directly marked, which is convenient for later recording and searching.

[0027] If it is necessary to detect other positions on the surface of the electromagnetic heating roller, just repeat the above steps; if the detection is completed, in order to prevent damage to the probe 12, marking components, etc., the protective component can be turned down by the rotating component to protect the probe 12, etc.

[0028] Finally, it should be noted that the detection principle of the thickness gauge body 1 and the probe 12 is prior art, so it will not be described in detail here.

[0029] As a preferred embodiment of the present invention, the support assembly includes a support column 26 and a connecting column 20, the upper end of the support column 26 is fixedly connected to the lower end of the thickness gauge body 1, the lower end of the support column 26 is fixedly connected to the upper end of the connecting column 20, a connecting port 21 is provided on the upper surface of the probe 12, the outer wall of the lower end of the connecting column 20 is threadedly connected to the inner wall of the connecting port 21, and the outer wall of the support column 26 is connected to the elastic assembly.

[0030] More specifically, by providing a support component, support can be provided to the probe 12 and the elastic component, thereby increasing connectivity and stability; and because the probe 12 will wear during detection, it can be disassembled through the connecting port 21 and the connecting column 20, making it convenient to repair or replace the probe 12.

[0031] As a preferred solution of the present invention, the elastic component includes a support box 13 and a push spring 18. A sleeve 27 is opened through the center of the upper surface of the support box 13, and a spring cavity 16 is opened on the bottom surface of the support box 13. The inner wall of the upper end of the sleeve 27 is fixedly connected to the outer wall of the lower end of the support column 26. The push spring 18 is located in the spring cavity 16, and the upper end of the push spring 18 is fixedly connected to the top surface of the spring cavity 16, and the lower end of the push spring 18 is connected to the marking component.

[0032] More specifically, by providing an elastic component, firstly, a certain degree of buffering can be provided to the marking component to avoid affecting the detection of the surface of the electromagnetic heating roller by the probe 12; secondly, when replacing the probe 12, the marking component can be manually pressed into the spring cavity 16 for storage, thereby reducing the difficulty of removing the probe 12.

[0033] As a preferred embodiment of the present invention, the marking component includes a liquid storage box 14, a marking cotton 15 and a leak-proof strip 23. The liquid storage box 14 is located in the spring cavity 16. The outer wall of the upper end of the liquid storage box 14 is slidably connected to the inner wall of the spring cavity 16. The bottom surface of the liquid storage box 14 is provided with a liquid storage cavity 22. The outer wall of the upper end of the leak-proof strip 23 is fixedly connected to the inner wall at the opening of the liquid storage cavity 22. The outer wall of the lower end of the leak-proof strip 23 is fixedly connected to the upper end of the marking cotton 15. The liquid storage box 14, the marking cotton 15 and the leak-proof strip 23 are all located on the outside of the probe 12, and the lowest surface of the marking cotton 15 is lower than the lowest surface of the probe 12.

[0034] More specifically, before using the probe 12 for detection, a certain amount of marking liquid is manually filled into the liquid storage chamber 22 of the liquid storage box 14. The marking liquid will not flow out by itself due to the sealing of the leak-proof strip 23. Only when the marking cotton 15 is against the surface of the electromagnetic heating roller, due to the squeezing force, a part of it will overflow into the marking cotton 15. At the same time, the marking liquid in the marking cotton 15 will adhere to the surface of the electromagnetic heating roller, thereby achieving the purpose of marking.

[0035] As a preferred embodiment of the present invention, an anti-slip groove 17 is provided on the inner wall of the spring cavity 16 , an anti-slip plate 19 is fixedly connected to the upper surface of the outer wall of the liquid storage box 14 , and the outer wall of the anti-slip plate 19 is slidably connected to the inner wall of the anti-slip groove 17 .

[0036] More specifically, by providing the anti-drop groove 17 and the anti-drop plate 19 , it is possible to prevent the liquid storage box 14 from falling out of the spring cavity 16 during the up and down movement, thereby preventing the probe 12 from performing normal detection.

[0037] As a preferred solution of the present invention, the rotating assembly includes a rotating shaft 5, an L-shaped plate 6 and two support blocks 4, one end of the two support blocks 4 are fixedly connected to the side walls of the thickness gauge body 1, the two ends of the rotating shaft 5 are respectively rotatably connected to the inner walls of the two support blocks 4, the upper end of the L-shaped plate 6 is sleeved and fixedly connected to the middle part of the rotating shaft 5, and the lower end of the L-shaped plate 6 is connected to the protective assembly.

[0038] More specifically, when the protective assembly needs to be opened, the L-shaped plate 6 only needs to be rotated to one side, and the L-shaped plate 6 can rotate through the rotating shaft 5 with the two supporting blocks 4 as support, so that the protective assembly connected to the lower end can be unfolded to one side.

[0039] As a preferred solution of the present invention, the protective component includes two semicircular protective boxes 7, and the two semicircular protective boxes 7 form a complete circle. A storage cavity 29 is provided on the adjacent side of the two semicircular protective boxes 7. The elastic component, the marking component and the probe 12 are all located in the two storage cavities 29. The upper surfaces of the two semicircular protective boxes 7 are penetrated by a bayonet 28 connected to the storage cavity 29. The two bayonet 28 form a circle, and this circle is sleeved and slidably connected to the outer wall of the support column 26. The bottom surfaces of the outer walls of the two semicircular protective boxes 7 are respectively connected to the two cleaning components.

[0040] More specifically, during protection, the elastic component, the marking component and the probe 12 are all located in the two storage cavities 29 of the two semicircular protection boxes 7, so objects in the external environment are not likely to cause damage to the probe 12, and will not accelerate the volatilization of the marking liquid in the marking cotton 15.

[0041] As a preferred solution of the present invention, the cleaning component includes Velcro 8 and wiping cotton 9, the upper surface of the Velcro 8 is fixedly connected to the bottom surface of the outer wall of the semicircular protective box 7, and the bottom surface of the Velcro 8 is bonded to the upper surface of the wiping cotton 9.

[0042] More specifically, when the surface of the electromagnetic heating roller needs to be inspected, if there is floating dust or other debris on the surface of the electromagnetic heating roller, the floating dust can be wiped off with the wiping cotton 9. When the wiping cotton 9 is worn out after being used for a period of time, it can be removed and replaced with the Velcro 8.

[0043] As a preferred solution of the present invention, a clamping strip 25 is fixedly connected to one side of one semicircular protective box 7 close to the other semicircular protective box 7, and a clamping groove 24 is opened on the side wall of the other semicircular protective box 7, and the outer wall of the clamping strip 25 is slidably connected to the inner wall of the clamping groove 24.

[0044] More specifically, by providing the clamping strip 25 and the clamping slot 24 , the connection between the two semicircular protection boxes 7 can be more convenient, and the sealing effect of the two semicircular protection boxes 7 can also be increased.

[0045] As a preferred solution of the present invention, the inner walls of the two L-shaped plates 6 close to one end of the rotating shaft 5 are embedded with and fixedly connected with magnets 10, and the outer walls on both sides of the thickness gauge body 1 are fixedly connected with two iron blocks 11, and the magnets 10 are matched and aligned with the iron blocks 11.

[0046] More specifically, by providing the magnet 10 and the iron block 11 , a connection can be added between the L-shaped plate 6 and the thickness gauge body 1 when the L-shaped plate 6 is protected downward and extended upward.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electromagnetic heating roller surface defect detection device, comprising a thickness gauge body (1), a probe (12) located below the thickness gauge body (1), a display screen (2) and operation buttons (3) installed on the thickness gauge body (1), characterized in that: The lower end of the thickness gauge body (1) is connected to a support component, the lower end of the support component is connected to the probe (12), the outer side of the support component is connected to an elastic component, the lower end of the elastic component is connected to a marking component, the marking component is located on the outer side of the probe (12), and the lowest point of the marking component is lower than the lowest point of the probe (12), both sides of the outer wall of the thickness gauge body (1) are connected to rotating components, the lower ends of the two rotating components are simultaneously connected to a protective component, the lower end of the protective component is connected to two cleaning components, and the elastic component, the marking component and the probe (12) are all located inside the protective component.

2. The electromagnetic heating roller surface defect detection device according to claim 1, characterized in that: The support assembly comprises a support column (26) and a connecting column (20); the upper end of the support column (26) is fixedly connected to the lower end of the thickness gauge body (1); the lower end of the support column (26) is fixedly connected to the upper end of the connecting column (20); a connecting port (21) is provided on the upper surface of the probe (12); the outer wall of the lower end of the connecting column (20) is threadedly connected to the inner wall of the connecting port (21); and the outer wall of the support column (26) is connected to the elastic assembly.

3. The electromagnetic heating roller surface defect detection device according to claim 2, characterized in that: The elastic component comprises a support box (13) and a push spring (18); a sleeve opening (27) is provided through the center of the upper surface of the support box (13); a spring cavity (16) is provided on the bottom surface of the support box (13); an inner wall at the upper end of the sleeve opening (27) is fixedly connected to an outer wall at the lower end of the support column (26); the push spring (18) is located in the spring cavity (16); the upper end of the push spring (18) is fixedly connected to the top surface of the spring cavity (16); and the lower end of the push spring (18) is connected to the marking component.

4. The electromagnetic heating roller surface defect detection device according to claim 3 is characterized in that: The marking assembly comprises a liquid storage box (14), a marking cotton (15) and a leak-proof strip (23); the liquid storage box (14) is located in the spring cavity (16); the outer wall of the upper end of the liquid storage box (14) is slidably connected to the inner wall of the spring cavity (16); the bottom surface of the liquid storage box (14) is provided with a liquid storage cavity (22); the outer wall of the upper end of the leak-proof strip (23) is fixedly connected to the inner wall at the opening of the liquid storage cavity (22); the outer wall of the lower end of the leak-proof strip (23) is fixedly connected to the upper end of the marking cotton (15); the liquid storage box (14), the marking cotton (15) and the leak-proof strip (23) are all located outside the probe (12); and the lowest surface of the marking cotton (15) is lower than the lowest surface of the probe (12).

5. The electromagnetic heating roller surface defect detection device according to claim 4, characterized in that: The inner wall of the spring chamber (16) is provided with an anti-slip groove (17), the upper surface of the outer wall of the liquid storage box (14) is fixedly connected with an anti-slip plate (19), and the outer wall of the anti-slip plate (19) is slidably connected to the inner wall of the anti-slip groove (17).

6. The electromagnetic heating roller surface defect detection device according to claim 1, characterized in that: The rotating assembly comprises a rotating shaft (5), an L-shaped plate (6) and two supporting blocks (4); one end of each of the two supporting blocks (4) is fixedly connected to the side wall of the thickness gauge body (1); two ends of the rotating shaft (5) are respectively rotatably connected to the inner walls of the two supporting blocks (4); the upper end of the L-shaped plate (6) is sleeved and fixedly connected to the middle of the rotating shaft (5); and the lower end of the L-shaped plate (6) is connected to the protective assembly.

7. The electromagnetic heating roller surface defect detection device according to claim 6, characterized in that: The protection assembly comprises two semicircular protection boxes (7), the two semicircular protection boxes (7) forming a complete circle, a storage cavity (29) being provided on adjacent sides of the two semicircular protection boxes (7), the elastic component, the marking component and the probe (12) being located in the two storage cavities (29), the upper surfaces of the two semicircular protection boxes (7) being penetrated by a bayonet (28) communicating with the storage cavity (29), the two bayonet (28) forming a circle, and the circle being sleeved and slidably connected to the outer wall of the support column (26), and the bottom surfaces of the outer walls of the two semicircular protection boxes (7) being respectively connected to the two cleaning assemblies.

8. The electromagnetic heating roller surface defect detection device according to claim 7, characterized in that: The cleaning component comprises a Velcro (8) and a wiping cotton (9), wherein the upper surface of the Velcro (8) is fixedly connected to the bottom surface of the outer wall of the semicircular protective box (7), and the bottom surface of the Velcro (8) is bonded to the upper surface of the wiping cotton (9).

9. The electromagnetic heating roller surface defect detection device according to claim 7, characterized in that: A clamping strip (25) is fixedly connected to one side of one of the semicircular protection boxes (7) close to the other semicircular protection box (7), a clamping slot (24) is provided on the side wall of the other semicircular protection box (7), and an outer wall of the clamping strip (25) is slidably connected to an inner wall of the clamping slot (24).

10. The electromagnetic heating roller surface defect detection device according to claim 6, characterized in that: The inner walls of the two L-shaped plates (6) close to one end of the rotating shaft (5) are both embedded with and fixedly connected with magnets (10), and the outer walls on both sides of the thickness gauge body (1) are both fixedly connected with two iron blocks (11), and the magnets (10) and the iron blocks (11) are matched and aligned.

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