A magnetic adapter

Abstract

The application discloses a magnetic attraction adapter and relates to the technical field of machine tool calibration. The magnetic attraction adapter comprises an adapter base body, the adapter base body is provided with a first side and a second side which are oppositely arranged; the first side is formed with a first magnetic attraction adapter part which is matched with the shape of a first magnetic attraction end, so as to form surface contact with the first magnetic attraction end for magnetic attraction cooperation; the second side is formed with a second magnetic attraction adapter part which is matched with the shape of a second magnetic attraction end, so as to form surface contact with the second magnetic attraction end for magnetic attraction cooperation; the magnetic attraction adapter is provided with a connecting hole which penetrates through the first magnetic attraction adapter part, the adapter base body and the second magnetic attraction adapter part, and the connecting hole is used for connecting a tool mounting groove. The application can stably fix the magnetic attraction bases produced by different manufacturers to the main shaft of a machine tool.

Description

Technical Field

[0001] This application relates to the field of machine tool calibration technology, and more specifically to a magnetic adapter. Background Technology

[0002] Generally, a machine tool consists of a worktable and a machine spindle. The worktable is the surface on which the workpiece is placed, and the cutting tool is mounted on the machine spindle via a tool holder. The machine spindle drives the cutting tool to machine the workpiece. In machine tools, it is often necessary to perform 360-degree horizontal accuracy checks on the worktable to ensure that its horizontal accuracy meets requirements. This is crucial for ensuring machining accuracy and product quality.

[0003] A detection assembly is typically used in conjunction with the machine tool spindle to perform 360-degree horizontal accuracy testing on the worktable. The detection assembly generally includes a magnetic base, a mounting bracket, and a testing instrument. The magnetic base has a mounting end and a magnetic suction end. The testing instrument is mounted on the mounting end via the mounting bracket. The testing instrument can be a dial indicator or a micrometer indicator, generally including an indicator and a probe. During 360-degree horizontal accuracy testing of the worktable, the magnetic suction end is magnetically attracted to the machine tool spindle or tool holder to fix it to the machine tool spindle, and the spring probe contacts the worktable. Thus, as the machine tool spindle rotates 360 degrees in the horizontal plane, the indicator reading can be obtained, and the horizontal accuracy of the worktable can be evaluated based on the indicator reading.

[0004] However, the shapes of the magnetic ends of magnetic bases produced by different manufacturers are not uniform. When the magnetic end of the magnetic base is attached to a machine tool spindle, it is generally attached to the end face or side wall of the machine tool spindle. If the shape of the magnetic end does not match the shape of the end face or side wall of the machine tool spindle, there is often a large gap between the magnetic end and the machine tool spindle, which can easily cause the magnetic base to wobble. When the magnetic end of the magnetic base is attached to a tool holder, it is generally attached to the side wall of the tool holder. If the shape of the magnetic end does not match the shape of the side wall of the tool holder, there is often a large gap between the magnetic end and the tool holder, which can easily cause the magnetic base to wobble.

[0005] Clearly, the wobbling of the magnetic base reduces the testing accuracy of the instrument, thus affecting the results of 360-degree horizontal accuracy testing of the worktable. Therefore, how to stably fix magnetic bases from different manufacturers to the machine tool spindle remains a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] In view of this, in order to solve the above-mentioned technical problems, this application provides a magnetic adapter for fixing the magnetic end of the magnetic base to the tool mounting slot; the magnetic end is a first magnetic end or a second magnetic end, and the first magnetic end and the second magnetic end have different shapes; the magnetic adapter includes an adapter base, and the adapter base has a first side and a second side arranged opposite to each other.

[0007] A first magnetic adapter is formed on the first side, which is adapted to the shape of the first magnetic end to form a surface contact with the first magnetic end for magnetic attraction; a second magnetic adapter is formed on the second side, which is adapted to the shape of the second magnetic end to form a surface contact with the second magnetic end for magnetic attraction; the magnetic adapter is provided with a connection hole that passes through the first magnetic adapter, the adapter base, and the second magnetic adapter, and the connection hole is used to connect the tool mounting slot.

[0008] Beneficial effects: Unlike existing technologies, in this application, since the tool mounting slot moves along with the machine tool spindle, the magnetic adapter fixed to the tool holder mounting slot is less prone to wobbling relative to the machine tool spindle. Therefore, either a first magnetic adapter can be magnetically engaged with a first magnetic end, or a second magnetic adapter can be magnetically engaged with a second magnetic end. This allows magnetic bases from different manufacturers to be stably fixed to the machine tool spindle. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the magnetic adapter of this application. Figure 1 Obtained from a first oblique view;

[0010] Figure 2 This is a schematic diagram of the magnetic adapter of this application. Figure 2 Obtained from a second oblique view;

[0011] Figure 3 This is a schematic diagram showing the first and second dimensions of the magnetic adapter of this application;

[0012] Figure 4 This is a schematic diagram showing the third dimension of the magnetic adapter of this application;

[0013] Figure 5 This is a schematic diagram showing the fourth dimension of the magnetic adapter of this application;

[0014] Figure 6 This is a schematic diagram of the assembly of the magnetic adapter, the detection component, and the tool holder in one embodiment of this application;

[0015] Figure 7 This is an exploded view of the magnetic adapter, detection component, and knife handle in one embodiment of this application;

[0016] Figure 8 This is a schematic diagram of the magnetic end of the magnetic base in one embodiment of this application;

[0017] Figure 9 This is a schematic diagram of the adapter structure in one embodiment of this application;

[0018] Figure 10This is an exploded schematic diagram of the tool holder and collet in one embodiment of this application;

[0019] Figure 11 This is a schematic diagram of the assembly of the magnetic adapter, the second magnetic base, and the knife handle in another embodiment of this application;

[0020] Figure 12 This is an exploded view of the magnetic adapter, the second magnetic base, and the knife handle in another embodiment of this application.

[0021] Explanation of reference numerals in the attached figures:

[0022] Magnetic adapter 100; connecting hole 101; adapter base 110; first side 111; second side 112; first magnetic adapter part 120; second magnetic adapter part 130; adapter 140; threaded part 141; column part 142; detection assembly 200; magnetic base 210; magnetic end 211; mounting end 212; mounting bracket 220; tester 230; indicator 231; probe 232; tool holder 310; tool mounting slot 311; collet 320;

[0023] First magnetic base 210a; first magnetic end 211a; first groove portion 213; platform portion 121; protrusion portion 122; first side wall 123; second side wall 124; inclined portion 125; vertical portion 126; side portion 127; second magnetic base 210b; second magnetic end 211b; second groove portion 131; protruding ring portion 132; groove bottom wall 133

[0024] First direction L; second direction W; third direction H; first dimension d1; second dimension d2; third dimension d3; fourth dimension d4. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] Combination Figures 1-2 See Figures 7-12The magnetic adapter 100 is used to fix the magnetic end 211 of the magnetic base 210 to the tool mounting slot 311. It should be noted that the tool mounting slot 311 is a slot that moves with the machine tool spindle and is used for directly or indirectly mounting tools (not shown). For example, the tool mounting slot 311 can be any one of the slots in the machine tool spindle for mounting the tool holder 310, the slots in the tool holder 310 for mounting the tool, and the slots in the angle head for mounting the tool. For ease of explanation, in subsequent embodiments, the tool mounting slot 311 will be described using the slot in the tool holder 310 as an example. However, it should be understood that the tool mounting slot 311 in subsequent embodiments can also be the slot in the machine tool spindle for mounting the tool holder 310 or the slot in the angle head for mounting the tool.

[0027] like Figures 6-7 As shown, the tool mounting slot 311 is provided on the tool holder 310, and the tool holder 310 is provided on the machine tool spindle (not shown) and rotates synchronously with the machine tool spindle. When the tool is removed from the tool mounting slot 311, the magnetic end 211 of the magnetic base 210 can be fixed to the tool mounting slot 311 by the magnetic adapter 100.

[0028] like Figures 6-8 As shown, the detection assembly 200 includes a magnetic base 210, a mounting bracket 220, and a tester 230. The magnetic base 210 has a mounting end 212 and a magnetic end 211. The tester 230 is mounted on the mounting end 212 via the mounting bracket 220. When the magnetic end 211 is fixed to the tool mounting slot 311 via the magnetic adapter 100, the tester 230 is used to cooperate with the worktable (not shown) to perform 360-degree horizontal accuracy detection on the worktable.

[0029] The tester 230 may include an indicator 231 and a probe 232. The indicator 231 is mounted on the mounting bracket 220, and the probe 232 is connected to the indicator 231. For example, but not limited to, the tester 230 may be a dial indicator or a micrometer indicator, but is not limited thereto. When the magnetic end 211 is fixed to the tool mounting slot 311 via the magnetic adapter 100, the probe 232 is used to contact the worktable. Thus, as the machine tool spindle rotates 360 degrees in the horizontal plane, the indicator reading can be obtained to assess the level accuracy of the worktable.

[0030] like Figures 7-8 As shown, the magnetic base 210 is the first magnetic base 210a, and the magnetic end 211 of the first magnetic base 210a is the first magnetic end 211a. Figures 11-12 As shown, the magnetic base 210 is the second magnetic base 210b, and the magnetic end 211 of the second magnetic base 210b is the second magnetic end 211b. Combined with... Figures 7-8 For comparison and reference Figures 11-12The first magnetic end 211a and the second magnetic end 211b have different shapes.

[0031] Combination Figures 7-12 See Figures 1-2 The magnetic adapter 100 includes an adapter base 110, which has a first side 111 and a second side 112 disposed opposite to each other. The first side 111 forms a first magnetic adapter portion 120, which is adapted to the shape of a first magnetic end 211a to form a surface contact for magnetic attraction. The second side 112 forms a second magnetic adapter portion 130, which is adapted to the shape of a second magnetic end 211b to form a surface contact for magnetic attraction. The magnetic adapter 100 is provided with a connection hole 101, which extends through the first magnetic adapter portion 120, the adapter base 110, and the second magnetic adapter portion 130, and is used to connect to a tool mounting slot 311.

[0032] In this way, since the tool mounting slot 311 moves with the machine tool spindle, the magnetic adapter 100 fixed to the tool holder 310 mounting slot is less likely to wobble relative to the machine tool spindle. Therefore, the first magnetic adapter 120 can be magnetically engaged with the first magnetic end 211a, or the second magnetic adapter 130 can be magnetically engaged with the second magnetic end 211b. This allows magnetic bases 210 from different manufacturers to be stably fixed to the machine tool spindle.

[0033] Optionally, such as Figures 1-2 As shown, the adapter base 110, the first magnetic adapter portion 120, and the second magnetic adapter portion 130 are integrally formed. Optionally, the adapter base 110, the first magnetic adapter portion 120, and the second magnetic adapter portion 130 may be made of ferromagnetic materials.

[0034] Optionally, combined Figures 6-10 See Figures 1-2 The first magnetic end 211a is provided with a first groove 213, and the first magnetic adapter 120 protrudes from the first side 111. The first magnetic adapter 120 is used to insert into the first groove 213 to form a surface contact with the first groove 213 for magnetic attraction. In this way, the concave-convex engagement between the first groove 213 and the first magnetic adapter 120 increases the stability of the first magnetic base 210a, making the first magnetic base 210a less prone to shaking.

[0035] Optionally, combined Figures 6-10 See Figures 1-2The first magnetic adapter 120 includes a platform portion 121, which protrudes from the first side 111 and gradually tapers in the direction facing the first side 111. A connecting hole 101 passes through the platform portion 121. The sidewall of the platform portion 121 is used to form a surface contact with the sidewall of the first groove portion 213 for magnetic attraction.

[0036] Optionally, combined Figures 6-10 See Figures 1-2 The first magnetic adapter 120 includes a protrusion 122, which protrudes from one end of the platform portion 121 facing away from the adapter base 110. Considering that if the protrusion 122 covers the connecting hole 101, the connecting hole 101 would need to penetrate the protrusion 122, and the portion of the sidewall of the connecting hole 101 located in the protrusion 122 would be prone to breakage, the protrusions 122 are distributed on both sides of the connecting hole 101 to avoid the connecting hole 101, thereby maintaining the structural strength of the protrusions 122. The end of the protrusion 122 facing away from the platform portion 121 is used to contact the bottom wall surface of the first groove portion 213 for magnetic engagement.

[0037] It should be noted that in other examples, the bottom wall of the first groove 213 may not be magnetic, while the side wall of the first groove 213 may be magnetic. In this case, although the end of the protrusion 122 facing away from the platform 121 can contact the bottom wall surface of the first groove 213, they cannot be magnetically engaged.

[0038] Optionally, combined Figures 6-10 See Figures 1-2 The first groove portion 213 extends along the first direction L to the opposite sides of the first magnetic end 211a. The protrusion portion 122 is distributed along the first direction L on both sides of the connecting hole 101, and the first magnetic adapter portion 120 extends along the first direction L to the opposite sides of the adapter base 110.

[0039] The first magnetic adapter 120 has a first sidewall 123 and a second sidewall 124 disposed opposite to each other along a second direction W perpendicular to the first direction L. At least one set of inclined portions 125 and vertical portions 126 are formed on the first sidewall 123. At least another set of inclined portions 125 and vertical portions 126 are formed on the second sidewall 124. The inclined portions 125 are located on the sidewall of the platform portion 121, and the vertical portions 126 are located on the sidewall of the protrusion portion 122.

[0040] In this manner, from the opening end of the first groove 213 to the bottom wall of the first groove 213, the inclined surface 125 and the vertical surface 126 sequentially form surface contact with the side wall of the first groove 213 to achieve magnetic attraction. This improves the stability of the magnetic attraction between the first magnetic adapter 120 and the first groove 213.

[0041] Optionally, combined Figures 6-10 See Figures 1-2 The first side 111 is provided with a side face 127, which is located on the outside of the platform 121 and is distributed on both sides of the platform 121 opposite to each other along the second direction W.

[0042] In this manner, the side face 127 and the end face of the side wall of the opening end of the first groove 213 form a surface contact for magnetic attraction. This improves the stability of the magnetic engagement between the first magnetic adapter 120 and the first groove 213.

[0043] Optionally, combined Figures 11-12 See Figures 1-2 The second magnetic adapter 130 is provided with a second groove 131, which can accommodate the insertion of the second magnetic end 211b to form a surface contact with the second magnetic end 211b for magnetic attraction. The connecting hole 101 penetrates the bottom wall of the second groove 131. In this way, the concave-convex engagement between the second magnetic adapter 130 and the second groove 131 increases the stability of the second magnetic base 210b, making the second magnetic base 210b less prone to shaking.

[0044] Optionally, the second magnetic adapter portion 130 includes a protruding ring portion 132 and a groove bottom wall 133. The protruding ring portion 132 protrudes from the second side 112 and forms the side wall of the second groove portion 131. The groove bottom wall 133 is the portion of the adapter base 110 located on the second side 112 and inside the protruding ring portion 132, forming the bottom wall of the second groove portion 131. This allows the thickness of the adapter base 110 to be maintained to a maximum extent, thus preserving the mechanical strength of the adapter base 110.

[0045] It should be noted that the protruding ring portion 132 can be a circle, polygon, triangle, or other closed shape. It should also be noted that even if the protruding ring portion 132 has a slight gap and does not form a closed shape, the gap is still allowed as long as it does not affect the radial limiting and fixing of the protruding ring portion 132 to the second magnetic suction end 211b.

[0046] Optionally, combined Figures 6-12 See Figures 1-2 The tool mounting slot 311 is provided with a collet 320. The magnetic adapter 100 includes an adapter 140, and the connecting hole 101 is a threaded hole. One end of the adapter 140 has a threaded portion 141, and the other end has a cylindrical portion 142. The threaded portion 141 is threadedly connected to the connecting hole 101, and the cylindrical portion 142 is used to extend into the collet 320 so that the collet 320 clamps the cylindrical portion 142.

[0047] The column portion 142 extends from the connecting hole 101 from either the first side 111 or the second side 112. Figures 1-2 See Figures 6-10As shown, when the column portion 142 extends out of the connecting hole 101 from the second side 112, the first magnetic adapter portion 120 can magnetically engage with the first magnetic end 211a. Figures 1-2 See Figures 11-12 As shown, when the column portion 142 extends out of the connection hole 101 from the first side 111, the second magnetic adapter portion 130 can magnetically engage with the second magnetic end 211b.

[0048] Through the above methods, combined Figures 1-2 See Figures 6-10 When it is necessary to fix the first magnetic base 210a, the column portion 142 can be extended from the second side 112 into the connecting hole 101 when installing the adapter 140, and then the column portion 142 can be inserted into the collet 320. Finally, the first magnetic end 211a can be magnetically engaged with the first magnetic adapter portion 120. Figures 1-2 See Figures 11-12 When it is necessary to fix the second magnetic base 210b, the column portion 142 can be extended from the first side 111 through the connecting hole 101 when installing the adapter 140, and then the column portion 142 can be inserted into the collet 320. Finally, the second magnetic end 211b can be magnetically engaged with the second magnetic adapter portion 130. In this way, a suitable magnetic adapter portion can be selected according to the magnetic base 210 that needs to be fixed.

[0049] Optionally (not shown), the cylindrical portion may include a first cylindrical segment and a second cylindrical segment, with the threaded portion, the first cylindrical segment, and the second cylindrical segment coaxially arranged, and the first cylindrical segment located between the second cylindrical segment and the threaded portion. The diameter of the first cylindrical segment is larger than that of the second cylindrical segment.

[0050] Using the above method, depending on the specifications of the collet 320, either the first column section or the second column section can be selected to mate with the collet 320. For example, and not as a limitation, the diameter of the first column section is 9mm to 10mm, and the diameter of the second column section is 7mm to 9mm.

[0051] For example, the diameter of the first column section is 10mm, and the diameter of the second column section is 8mm. Then, when the inner diameter of the collet 320 is 8mm, the second column section can be used to mate with the collet 320; when the inner diameter of the collet 320 is 10mm, the first column section can be used to mate with the collet 320.

[0052] For example, the diameter of the first column section is 11mm and the diameter of the second column section is 9mm. When the inner diameter of the collet 320 is 9mm, the second column section can be selected to cooperate with the collet 320; when the inner diameter of the collet 320 is 11mm, the first column section can be selected to cooperate with the collet 320.

[0053] For example, the diameter of the first column section is 9mm and the diameter of the second column section is 7mm. Then, when the inner diameter of the collet 320 is 7mm, the second column section can be selected to cooperate with the collet 320; when the inner diameter of the collet 320 is 9mm, the first column section can be selected to cooperate with the collet 320.

[0054] Optionally, combined Figures 1-2 See Figure 3 and Figure 5 The first magnetic adapter 120 extends along the first direction L to the opposite two sides of the adapter base 110. The first side 111 and the second side 112 are arranged opposite to each other along the third direction H.

[0055] The magnetic adapter 100 has a first dimension d1 in the first direction L. The magnetic adapter 100 has a second dimension d2 in the second direction W, which is perpendicular to both the first direction L and the third direction H. The magnetic adapter 100 has a fourth dimension d4 in the third direction H. The first dimension d1 is 55mm to 65mm, the second dimension d2 is 45mm to 55mm, and the fourth dimension d4 is 15.3mm to 21.3mm, but is not limited to these dimensions.

[0056] Optionally, combined Figures 1-2 See Figure 4 The protruding ring 132 is circular, and the outer diameter of the protruding ring 132 is the third dimension d3, which is 40mm to 50mm, but not limited to this.

[0057] Combination Figures 1-2 See Figures 3-5 For example, the first dimension d1 is 55mm, the second dimension d2 is 45mm, the third dimension d3 is 40mm, and the fourth dimension d4 is 15.3mm. For example, the first dimension d1 is 60mm, the second dimension d2 is 50mm, the third dimension d3 is 45mm, and the fourth dimension d4 is 18.3mm. For example, the first dimension d1 is 65mm, the second dimension d2 is 55mm, the third dimension d3 is 50mm, and the fourth dimension d4 is 21.3mm.

[0058] The above are merely embodiments of this application and do not limit the scope of this patent application. Any equivalent structural or procedural changes made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A magnetic adapter, characterized in that, The magnetic end of the magnetic base is used to fix the magnetic end to the tool mounting slot; the magnetic end is a first magnetic end or a second magnetic end, and the first magnetic end and the second magnetic end have different shapes; the magnetic adapter includes an adapter base, and the adapter base has a first side and a second side arranged opposite to each other. A first magnetic adapter is formed on the first side, which is adapted to the shape of the first magnetic end to form a surface contact with the first magnetic end for magnetic attraction; a second magnetic adapter is formed on the second side, which is adapted to the shape of the second magnetic end to form a surface contact with the second magnetic end for magnetic attraction; the magnetic adapter is provided with a connection hole, which passes through the first magnetic adapter, the adapter base and the second magnetic adapter, and is used to connect the tool mounting slot.

2. The magnetic adapter according to claim 1, characterized in that, The first magnetic end is provided with a first groove, and the first magnetic adapter protrudes from the first side; the first magnetic adapter is used to insert into the first groove to form a surface contact with the first groove for magnetic attraction.

3. The magnetic adapter according to claim 2, characterized in that, The first magnetic adapter includes a platform portion, which protrudes from the first side and gradually contracts along the direction in which the first side faces. The connecting hole penetrates the platform portion; the side wall of the platform portion is used to form a surface contact with the side wall of the first groove portion for magnetic attraction.

4. The magnetic adapter according to claim 3, characterized in that, The first magnetic adapter includes a protrusion portion, which protrudes from one end of the platform portion facing away from the adapter base. The protrusions are distributed on both sides of the connecting hole, and the end of the protrusion facing away from the platform is used to contact the bottom wall of the first groove for magnetic attraction.

5. The magnetic adapter according to claim 4, characterized in that, The first groove extends along the first direction to penetrate the two opposite sides of the first magnetic end; the protrusion is distributed along the first direction on both sides of the connecting hole, and the first magnetic adapter extends along the first direction to the two opposite sides of the adapter base. The first magnetic adapter has a first sidewall and a second sidewall disposed opposite to each other along a second direction perpendicular to the first direction; at least one set of inclined and vertical portions are formed on the first sidewall; at least another set of inclined and vertical portions are formed on the second sidewall; the inclined portions are located on the sidewall of the platform portion, and the vertical portions are located on the sidewall of the protrusion portion; from the opening end of the first groove portion to the bottom wall of the first groove portion, the inclined portions and the vertical portions are used to sequentially form surface contact with the sidewall of the first groove portion for magnetic attraction.

6. The magnetic adapter according to claim 5, characterized in that, The first side is provided with a side face, which is located on the outside of the platform and is distributed on both sides of the platform opposite to each other along the second direction; The side face is used to form a surface contact with the end face of the sidewall of the opening end of the first groove for magnetic attraction.

7. The magnetic adapter according to claim 1, characterized in that, The second magnetic adapter is provided with a second groove, which can accommodate the insertion of the second magnetic end to form a surface contact with the second magnetic end for magnetic attraction; the connecting hole penetrates the bottom wall of the second groove.

8. The magnetic adapter according to claim 7, characterized in that, The second magnetic adapter includes a convex ring portion and a groove bottom wall; the convex ring portion protrudes from the second side to form the side wall of the second groove portion; the groove bottom wall is the portion of the adapter base located on the second side and inside the convex ring portion, to form the bottom wall of the second groove portion.

9. The magnetic adapter according to claim 1, characterized in that, The tool mounting slot is provided with a collet, and the magnetic adapter includes an adapter, the connecting hole being a threaded hole; one end of the adapter has a threaded portion, and the other end has a cylindrical portion; the threaded portion is threadedly connected to the connecting hole, and the cylindrical portion is used to extend into the collet so that the collet clamps the cylindrical portion; The column portion extends out of the connecting hole from either the first side or the second side; when the column portion extends out of the connecting hole from the second side, the first magnetic adapter portion can magnetically engage with the first magnetic end; when the column portion extends out of the connecting hole from the first side, the second magnetic adapter portion can magnetically engage with the second magnetic end.

10. The magnetic adapter according to claim 7, characterized in that, The first magnetic adapter extends along a first direction to two opposite sides of the adapter base; the first side and the second side are arranged opposite to each other along a third direction; Wherein, the dimension of the magnetic adapter in the first direction is a first dimension; the dimension of the magnetic adapter in the second direction is a second dimension, the second direction being perpendicular to the first direction and the third direction; the dimension of the magnetic adapter in the third direction is a fourth dimension; the second magnetic adapter includes a protruding ring portion, the protruding ring portion protruding from the second side to form the sidewall of the second groove portion, the outer diameter of the protruding ring portion is a third dimension; the first dimension is 55mm~65mm, the second dimension is 45mm~55mm, and the third dimension is 15.3mm~21.3mm.

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