An insulating bolt for photovoltaics

Abstract

The present invention relates to the technical field of bolts, and discloses an insulating bolt for photovoltaics, which solves the problem of poor insulation and anti-loosening performance of existing bolts. The bolt body comprises a bolt body and a combined nut matched therewith, wherein the bolt body consists of a bolt head and a bolt column, and a built-in anti-loosening locking mechanism is inserted into the bolt head and the bolt column, and a first insulating gasket, a second insulating gasket and a combined insulating bushing are sleeved on the bolt column, and the combined nut consists of a nut body and an external anti-loosening locking mechanism, and the external anti-loosening locking mechanism is fixedly connected to one end of the nut body and matched with the built-in anti-loosening locking mechanism, and the nut body and the external anti-loosening locking mechanism are both sleeved on the bolt column, and the outer surfaces of the bolt head and the nut body are fixedly provided with insulating casting sleeves; the overall insulation can be improved by using the bolt, and the stability of the connection with the nut can be improved to avoid loosening.

Description

Technical Field

[0001] The present invention belongs to the technical field of bolts, and in particular relates to an insulating bolt for photovoltaics. Background Art

[0002] A large number of bolts are required during the installation of photovoltaic products. Existing photovoltaic bolt fasteners often have many problems during use, such as: the existing bolts have poor insulation performance. Since there is high voltage when photovoltaic products generate electricity, when the staff tighten the loose bolts later, it is easy to cause leakage and affect the life safety of the staff; when the existing bolts and nuts are connected, the connection structure is single. When the photovoltaic products are installed outdoors and shaken by strong winds, it is easy to cause the bolts and nuts to loosen, which in turn affects the stability and safety of the connection and the use effect is not good. In addition, the existing bolt and nut connection method has poor anti-theft performance. Therefore, the present application proposes an insulating bolt for photovoltaics to solve the above problems. Summary of the Invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an insulating bolt for photovoltaic use, which effectively solves the problems of poor insulation and anti-loosening performance of the existing bolts.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an insulating bolt for photovoltaic use, comprising a bolt body and a combined nut matching therewith, wherein the bolt body is composed of a bolt head and a bolt column, the bolt head is fixedly connected to one end of the bolt column, and a built-in anti-loosening locking mechanism is inserted into the interior of the bolt head and the bolt column, a first insulating gasket, a second insulating gasket and a combined insulating bushing are sleeved on the bolt column, the combined insulating bushing is located between the first insulating gasket and the second insulating gasket, the combined nut is composed of a nut body and an external anti-loosening locking mechanism, the external anti-loosening locking mechanism is fixedly connected to one end of the nut body and matches the built-in anti-loosening locking mechanism, the nut body and the external anti-loosening locking mechanism are both sleeved on the bolt column, and an insulating casting sleeve is fixedly provided on the outer surfaces of the bolt head and the nut body.

[0005] Preferably, the combined insulating sleeve is composed of an insulating end plate 1, an insulating inner sleeve, an insulating end plate 2 and an insulating outer sleeve. The insulating end plate 1 is fixedly connected to one end of the insulating inner sleeve. The inner surface of the insulating inner sleeve is provided with an internal thread matching the bolt column. The insulating end plate 2 is fixedly connected to one end of the insulating outer sleeve, and the insulating outer sleeve is sleeved on the insulating inner sleeve.

[0006] Preferably, the built-in anti-loosening locking mechanism consists of a long shaft, a flower groove pin head, a threaded traction sleeve, an adjusting screw, an anti-theft limiting assembly and a bearing. The flower groove pin head is fixedly connected to one end of the long shaft, the threaded traction sleeve is fixedly connected to the other end of the long shaft, the adjusting screw is rotatably connected to the inside of the bolt head through a bearing, the anti-theft limiting assembly is connected between the adjusting screw and the bolt head, a plurality of limiting ridges are fixedly provided on the arc-shaped outer surface of the long shaft, and an inner hexagonal groove is provided on the end of the adjusting screw away from the threaded traction sleeve, and the inner hexagonal groove is a stepped structure.

[0007] Preferably, one end of the bolt column is provided with a placement groove matching the flower groove type pin head, the other end of the bolt column is provided with a cylindrical through groove connected to the placement groove and matching the long axis, the inner surface of the cylindrical through groove is provided with a plurality of strip-shaped limiting flower grooves matching the limiting convex strips, the inside of the bolt head is provided with an installation inner groove connected to the cylindrical through groove and matching the adjusting screw, the anti-theft limiting assembly and the bearing, and the other end of the installation inner groove is connected to the outside.

[0008] Preferably, the external anti-loosening locking mechanism is composed of an extension sleeve, a U-shaped bracket and a flower groove type limiting sleeve, the extension sleeve is fixedly connected to one end of the nut body, the U-shaped bracket is fixedly connected to the outer surface of the extension sleeve and extends to an end away from the nut body, and the flower groove type limiting sleeve is fixedly connected to one end inside the U-shaped bracket and matches the flower groove type pin head.

[0009] Preferably, the anti-theft limiting assembly consists of a limiting sleeve and a locking disk, the limiting sleeve is fixedly connected to the inside of the bolt head, the locking disk is sleeved on the adjusting screw and fixedly connected thereto, and the locking disk is located inside the limiting sleeve.

[0010] Preferably, a through hole is provided in the middle of the limiting sleeve, and a plurality of slots matching the locking disk are provided on the inner surface of the limiting sleeve.

[0011] Preferably, the locking disk is composed of a disk body and a locking limit unit, a mounting through hole matching the adjusting screw is opened in the middle of the disk body, and the locking limit unit is connected to the side of the disk body and matches the slot.

[0012] Preferably, the engaging limiting unit is composed of a traction seat, a rotating shaft, a locking tooth and a tension spring. The traction seat is fixedly connected to the inside of the disc body, the locking tooth is rotatably connected to the disc body through the rotating shaft, and the tension spring is connected between the traction seat and the locking tooth.

[0013] Preferably, the locking teeth are composed of locking limit teeth and magnetic swing arms, the locking limit teeth and the magnetic swing arms are fixedly connected, the locking limit teeth, the limiting sleeve and the disk body are all made of aluminum alloy, and the magnetic swing arm is made of iron.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) During operation, by providing a first insulating gasket, a second insulating gasket, an insulating casting sleeve, and a combined insulating bushing consisting of an insulating end plate 1, an insulating inner sleeve, an insulating end plate 2, and an insulating outer sleeve, the insulation performance of the bolt and the nut matched therewith can be improved, and the safety of the staff during the subsequent maintenance can be improved to avoid electric shock;

[0016] (2) By setting up a built-in anti-loosening locking mechanism consisting of a long shaft, a flower groove pin head, a threaded traction sleeve, an adjusting screw, an anti-theft limit assembly and a bearing, and an external anti-loosening locking mechanism consisting of an extension sleeve, a U-shaped bracket and a flower groove limit sleeve, the bolts and nuts can be locked and limited to prevent them from loosening due to vibration, thereby improving the stability of the photovoltaic product installation;

[0017] (3) By setting up an anti-theft limit assembly consisting of a limit sleeve and a locking disk, the built-in anti-loosening locking mechanism can be locked and limited for a second time, further improving the anti-loosening performance. At the same time, it can also provide better anti-theft performance, preventing non-professionals from disassembling bolts and nuts, thereby improving the safety of photovoltaic products. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0019] In the attached figure:

[0020] Figure 1 This is a schematic diagram of the connection structure between the bolt body and the combined nut of the present invention;

[0021] Figure 2 This is a schematic diagram of the bolt body structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the combined nut structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the combined insulating bushing of the present invention;

[0024] Figure 5 This is one of the cross-sectional views of the bolt body of the present invention;

[0025] Figure 6 This is the second cross-sectional view of the bolt body of the present invention;

[0026] Figure 7 This is a schematic structural diagram of the built-in anti-loosening locking mechanism of the present invention;

[0027] Figure 8 For the present invention Figure 5 A partial enlarged view of

[0028] Figure 9 This is a schematic structural diagram of the anti-theft limiting assembly of the present invention;

[0029] Figure 10 This is a schematic diagram of the structure of the limiting sleeve of the present invention;

[0030] Figure 11 This is a schematic diagram of the locking disk structure of the present invention;

[0031] Figure 12 For the present invention Figure 9 A partial enlarged view of

[0032] In the figure: 1. Bolt body; 2. Combined nut; 3. Bolt head; 4. Bolt column; 5. Built-in anti-loosening locking mechanism; 6. First insulating gasket; 7. Second insulating gasket; 8. Combined insulating bushing; 9. Nut body; 10. External anti-loosening locking mechanism; 11. Insulating casting sleeve; 12. Insulating end plate 1; 13. Insulating inner sleeve; 14. Insulating end plate 2; 15. Insulating outer sleeve; 16. Internal thread; 17. Long shaft; 18. Grooved pin head; 19. Threaded traction sleeve; 20. Adjusting screw; 21. Anti-theft limit assembly; 22. Bearing; 23. Limiting rib; 24. Hexagonal socket; 25. Placement slot; 26. Cylindrical through slot; 27. Strip-shaped limiting flower slot; 28. Installation inner slot; 29. ​​Extension sleeve; 30. U-shaped bracket; 31. Flower slot-type limiting sleeve; 32. Limiting sleeve; 33. Locking disk; 34. Through hole; 35. Slot; 36. Disk body; 37. Engaging limiting unit; 38. Installation through hole; 39. Traction seat; 40. Rotating shaft; 41. Gear; 42. Tension spring; 43. Engaging limiting tooth; 44. Magnetic swing arm. DETAILED DESCRIPTION

[0033] 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; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] Embodiment 1, by Figures 1 to 5The present invention provides an insulating bolt for photovoltaic use, comprising a bolt body 1 and a combined nut 2 matched therewith, wherein the bolt body 1 is composed of a bolt head 3 and a bolt column 4, the bolt head 3 is fixedly connected to one end of the bolt column 4, and a built-in anti-loosening locking mechanism 5 is inserted into the interior of the bolt head 3 and the bolt column 4, and a first insulating gasket 6, a second insulating gasket 7 and a combined insulating bushing 8 are sleeved on the bolt column 4, and the combined insulating bushing 8 is located between the first insulating gasket 6 and the second insulating gasket 7, and the combined nut 2 is composed of a nut body 9 and an external anti-loosening locking mechanism 10, the external anti-loosening locking mechanism 10 is fixedly connected to one end of the nut body 9 and matches the built-in anti-loosening locking mechanism 5, the nut body 9 and the external anti-loosening locking mechanism 10 are both sleeved on the bolt column 4, and an insulating casting sleeve 11 is fixedly provided on the outer surfaces of the bolt head 3 and the nut body 9;

[0035] When in use, the first insulating gasket 6 and the second insulating gasket 7 achieve primary insulation, the insulating casting sleeve 11 achieves secondary insulation, and the combined insulating bushing 8 achieves tertiary insulation, thereby improving the overall insulation performance and reducing the possibility of electric shock for maintenance personnel in the later stage;

[0036] The combined insulating bushing 8 is composed of an insulating end plate 12, an insulating inner sleeve 13, an insulating end plate 2 14 and an insulating outer sleeve 15. The insulating end plate 12 is fixedly connected to one end of the insulating inner sleeve 13. The inner surface of the insulating inner sleeve 13 is provided with an internal thread 16 that matches the bolt column 4. The insulating end plate 2 14 is fixedly connected to one end of the insulating outer sleeve 15. The insulating outer sleeve 15 is sleeved on the insulating inner sleeve 13.

[0037] During installation, first, the insulating inner sleeve 13 is sleeved on the outer surface of the bolt column 4, the insulating outer sleeve 15 is inserted into the bolt hole of the part to be installed, and then the insulating inner sleeve 13 is inserted into the interior of the insulating outer sleeve 15, and finally the combined nut 2 is installed, and connected through the built-in anti-loosening locking mechanism 5 and the external anti-loosening locking mechanism 10, thereby forming a limit, realizing locking of the bolt body 1 and the combined nut 2, and improving the anti-loosening performance and anti-theft performance.

[0038] Example 2, based on Example 1, Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8It is given that the built-in anti-loosening locking mechanism 5 is composed of a long shaft 17, a flower groove pin head 18, a threaded traction sleeve 19, an adjusting screw 20, an anti-theft limiting assembly 21 and a bearing 22. The flower groove pin head 18 is fixedly connected to one end of the long shaft 17, and the threaded traction sleeve 19 is fixedly connected to the other end of the long shaft 17. The adjusting screw 20 is rotatably connected to the inside of the bolt head 3 through the bearing 22. The anti-theft limiting assembly 21 is connected between the adjusting screw 20 and the bolt head 3. The arcuate outer surface of the long shaft 17 is fixedly provided with a plurality of limiting ridges 23. The end of the adjusting screw 20 away from the threaded traction sleeve 19 is provided with an inner hexagonal groove 24, and the inner hexagonal groove 24 is a stepped structure. One end of the bolt column 4 is provided with a placement groove 25 matching the flower groove pin head 18, and the other end of the bolt column 4 is provided with a placement groove There is a cylindrical through groove 26 connected to the placement groove 25 and matching the long axis 17. The inner surface of the cylindrical through groove 26 is provided with a plurality of strip-shaped limiting flower grooves 27 matching the limiting convex strips 23. The interior of the bolt head 3 is provided with an installation inner groove 28 connected to the cylindrical through groove 26 and matching the adjusting screw 20, the anti-theft limiting assembly 21 and the bearing 22. The other end of the installation inner groove 28 is connected to the outside. The external anti-loosening locking mechanism 10 is composed of an extension sleeve 29, a U-shaped bracket 30 and a flower groove limiting sleeve 31. The extension sleeve 29 is fixedly connected to one end of the nut body 9. The U-shaped bracket 30 is fixedly connected to the outer surface of the extension sleeve 29 and extends to the end away from the nut body 9. The flower groove limiting sleeve 31 is fixedly connected to one end inside the U-shaped bracket 30 and matches the flower groove pin head 18.

[0039] The nut body 9 is installed in place so that the groove type limiting sleeve 31 can fit or nearly fit with one end of the bolt column 4. At this time, a hexagonal wrench is inserted into the inner hexagonal groove 24 to drive the adjusting screw 20 to rotate. The stability and mobility of the adjusting screw 20 can be improved by the bearing 22. While the adjusting screw 20 rotates, the threaded traction sleeve 19 is pushed to move. The threaded traction sleeve 19 drives the long shaft 17 and the groove type pin head 18 to move synchronously, so that the groove type pin head 18 is moved out of the interior of the placement groove 25 and enters the interior of the groove type limiting sleeve 31. The groove type pin head 18 and the groove type limiting sleeve 31 are used to limit the position, thereby avoiding loosening and improving the connection stability. The anti-theft limiting component 21 can be used to limit the adjusting screw 20, further improving the anti-loosening effect and the anti-theft effect.

[0040] Example 3, based on Example 2, Figure 2 、 Figure 5 、 Figure 7 、 Figure 9 、 Figure 10 、 Figure 11 and Figure 12The anti-theft limit assembly 21 is composed of a limit sleeve 32 and a locking plate 33. The limit sleeve 32 is fixedly connected to the inside of the bolt head 3. The locking plate 33 is sleeved on the adjusting screw 20 and fixedly connected thereto. The locking plate 33 is located inside the limit sleeve 32. A through hole 34 is provided in the middle position of the limit sleeve 32. A plurality of card slots 35 matching the locking plate 33 are provided on the inner surface of the limit sleeve 32. The locking plate 33 is composed of a disk body 36 and a locking limit unit 37. A mounting through hole 38 matching the adjusting screw 20 is provided in the middle position of the disk body 36. The locking limit unit 37 is engaged with the limit unit 37. 7 is connected to the side of the disc body 36 and matches the card slot 35. The engagement limit unit 37 is composed of a traction seat 39, a rotating shaft 40, a locking tooth 41 and a tension spring 42. The traction seat 39 is fixedly connected to the inside of the disc body 36. The locking tooth 41 is rotatably connected to the disc body 36 via the rotating shaft 40. The tension spring 42 is connected between the traction seat 39 and the locking tooth 41. The locking tooth 41 is composed of an engagement limit tooth 43 and a magnetic swing arm 44. The engagement limit tooth 43 and the magnetic swing arm 44 are fixedly connected. The engagement limit tooth 43, the limiting sleeve 32 and the disc body 36 are all made of aluminum alloy, and the magnetic swing arm 44 is made of iron.

[0041] During the rotation of the adjusting screw 20, the locking plate 33 will be driven to rotate synchronously, and the adjusting screw 20 will be limited by the automatic locking of the locking plate 33 and the limiting sleeve 32, so as to avoid the adjusting screw 20 from being vibrated and rotating by itself during the later use, thereby further improving the stability of the connection. If it is necessary to disassemble it later, first put the strong annular neodymium magnet on the outer surface of the bolt head 3, and then use the hexagonal wrench to drive the adjusting screw 20 to rotate slightly to unload the force, thereby relieving the friction between the slot 35 and the tooth 41. At this time, the magnetic swing arm 4 4 receives a strong magnetic force and swings around the rotating shaft 40, and the magnetic swing arm 44 drives the engaging limiting tooth 43 to swing, and the engaging limiting tooth 43 is separated from the engaging groove 35. At this time, the limit is completely released, and then the adjusting screw 20 is reversed by using a hexagonal wrench to release the limiting effect of the built-in anti-loosening locking mechanism 5 and the external anti-loosening locking mechanism 10, so that the bolt body 1 and the combined nut 2 can be disassembled. Since a strong neodymium magnet is needed to assist in unlocking, the anti-theft performance can be improved, thereby preventing the photovoltaic product from being stolen and improving safety.

[0042] During operation, by providing a first insulating gasket, a second insulating gasket, an insulating casting sleeve and a combined insulating sleeve composed of an insulating end plate one, an insulating inner sleeve, an insulating end plate two and an insulating outer sleeve, the insulation performance of the bolt and the nut matched therewith can be improved, the safety of the later maintenance staff can be improved, and the electric shock can be avoided; by providing a built-in anti-loosening locking mechanism composed of a long shaft, a flower groove pin head, a threaded traction sleeve, an adjusting screw, an anti-theft limit assembly and a bearing, and an external anti-loosening locking mechanism composed of an extension sleeve, a U-shaped bracket and a flower groove limit sleeve, the bolts and nuts can be locked and limited to prevent them from loosening due to vibration, thereby improving the stability of the installation of the photovoltaic product; by providing an anti-theft limit assembly composed of a limit sleeve and a locking disk, the built-in anti-loosening locking mechanism can be locked and limited for the second time, further improving the anti-loosening performance, and at the same time having better anti-theft performance, preventing non-professionals from disassembling the bolts and nuts, and improving the safety of the photovoltaic product.

Claims

1. An insulating bolt for photovoltaic use, comprising a bolt body (1) and a combined nut (2) matching the bolt body, characterized in that: The bolt body (1) is composed of a bolt head (3) and a bolt column (4), the bolt head (3) is fixedly connected to one end of the bolt column (4), and a built-in anti-loosening locking mechanism (5) is inserted into the interior of the bolt head (3) and the bolt column (4), and a first insulating gasket (6), a second insulating gasket (7) and a combined insulating bushing (8) are sleeved on the bolt column (4), and the combined insulating bushing (8) is located between the first insulating gasket (6) and the second insulating gasket (7), and the combined nut (2) is composed of a nut body (9) and an external anti-loosening locking mechanism (10), and the external anti-loosening locking mechanism (10) is fixedly connected to one end of the nut body (9) and matches the built-in anti-loosening locking mechanism (5), and the nut body (9) and the external anti-loosening locking mechanism (10) are both sleeved on the bolt column (4), and the outer surfaces of the bolt head (3) and the nut body (9) are fixedly provided with an insulating casting sleeve (11); The built-in anti-loosening locking mechanism (5) is composed of a long shaft (17), a flower groove pin head (18), a threaded traction sleeve (19), an adjusting screw (20), an anti-theft limiting assembly (21) and a bearing (22). The flower groove pin head (18) is fixedly connected to one end of the long shaft (17), the threaded traction sleeve (19) is fixedly connected to the other end of the long shaft (17), the adjusting screw (20) is rotatably connected to the inside of the bolt head (3) through the bearing (22), the anti-theft limiting assembly (21) is connected between the adjusting screw (20) and the bolt head (3), the arc-shaped outer surface of the long shaft (17) is fixedly provided with a plurality of limiting convex strips (23), and the end of the adjusting screw (20) away from the threaded traction sleeve (19) is provided with an inner hexagonal groove (24), and the inner hexagonal groove (24) is a stepped structure.

2. The photovoltaic insulating bolt according to claim 1, characterized in that: The combined insulating bushing (8) is composed of an insulating end plate (12), an insulating inner sleeve (13), an insulating end plate (14) and an insulating outer sleeve (15), wherein the insulating end plate (12) is fixedly connected to one end of the insulating inner sleeve (13), and the inner surface of the insulating inner sleeve (13) is provided with an internal thread (16) matching the bolt column (4), and the insulating end plate (14) is fixedly connected to one end of the insulating outer sleeve (15), and the insulating outer sleeve (15) is sleeved on the insulating inner sleeve (13).

3. The photovoltaic insulating bolt according to claim 1, characterized in that: One end of the bolt column (4) is provided with a placement groove (25) that matches the flower groove type pin head (18), and the other end of the bolt column (4) is provided with a columnar through groove (26) that is connected to the placement groove (25) and matches the long axis (17). The inner surface of the columnar through groove (26) is provided with a plurality of strip-shaped limiting flower grooves (27) that match the limiting convex strips (23). The bolt head (3) is provided with an installation inner groove (28) that is connected to the columnar through groove (26) and matches the adjusting screw (20), the anti-theft limiting assembly (21) and the bearing (22), and the other end of the installation inner groove (28) is connected to the outside.

4. The photovoltaic insulating bolt according to claim 1, characterized in that: The external anti-loosening locking mechanism (10) is composed of an extension sleeve (29), a U-shaped bracket (30) and a flower groove type limiting sleeve (31), wherein the extension sleeve (29) is fixedly connected to one end of the nut body (9), the U-shaped bracket (30) is fixedly connected to the outer surface of the extension sleeve (29) and extends to an end away from the nut body (9), and the flower groove type limiting sleeve (31) is fixedly connected to one end inside the U-shaped bracket (30) and matches the flower groove type pin head (18).

5. The photovoltaic insulating bolt according to claim 1, characterized in that: The anti-theft limiting assembly (21) is composed of a limiting sleeve (32) and a locking disc (33), wherein the limiting sleeve (32) is fixedly connected to the inside of the bolt head (3), and the locking disc (33) is sleeved on the adjusting screw (20) and fixedly connected thereto, and the locking disc (33) is located inside the limiting sleeve (32).

6. The photovoltaic insulating bolt according to claim 5, characterized in that: A through hole (34) is provided in the middle of the limiting sleeve (32), and a plurality of slots (35) matching the locking disc (33) are provided on the inner surface of the limiting sleeve (32).

7. The photovoltaic insulating bolt according to claim 6, characterized in that: The locking disc (33) is composed of a disc body (36) and a locking limit unit (37). A mounting through hole (38) matching the adjusting screw (20) is provided in the middle of the disc body (36). The locking limit unit (37) is connected to the side of the disc body (36) and matches the locking groove (35).

8. The photovoltaic insulating bolt according to claim 7, characterized in that: The engaging limiting unit (37) is composed of a traction seat (39), a rotating shaft (40), a latching tooth (41) and a tension spring (42). The traction seat (39) is fixedly connected to the inside of the disc body (36). The latching tooth (41) is rotatably connected to the disc body (36) via the rotating shaft (40). The tension spring (42) is connected between the traction seat (39) and the latching tooth (41).

9. The photovoltaic insulating bolt according to claim 8, characterized in that: The latching tooth (41) is composed of a latching limit tooth (43) and a magnetic swing arm (44), the latching limit tooth (43) and the magnetic swing arm (44) are fixedly connected, the latching limit tooth (43), the limit sleeve (32) and the disc body (36) are all made of aluminum alloy, and the magnetic swing arm (44) is made of iron.

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