Waterproof and dustproof magnetic base

Abstract

A waterproof and dustproof magnetic base comprises a permanent magnet assembly and a soft magnet shell, the middle of the soft magnet shell is concavely provided with an inner hole which does not penetrate through the bottom wall of the soft magnet shell, the bottom end of the permanent magnet assembly is arranged in the inner hole in the middle of the soft magnet shell, and the part, arranged in the inner hole of the soft magnet shell, of the permanent magnet assembly is a permanent magnet. An annular boss I which surrounds the edge of the inner hole and vertically extends upwards is arranged on the inner edge of the upper end face of the soft magnet shell, an annular protruding block which protrudes out of the outer side of the inner hole in the radial direction is arranged at the top end of the permanent magnet assembly, and an annular boss II which extends downwards is arranged on the outer edge of the bottom end of the annular protruding block. The inner side wall of the annular boss II and the outer surface of the upper section of the permanent magnet form an annular groove, the annular boss I is located in the annular groove when the permanent magnet assembly is installed in an inner hole in the middle of the soft magnet shell, and the annular boss II is located on the outer side of the annular boss I. By adopting the structure, water and dust can be effectively prevented, the service life of the magnetic base is prolonged, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to a technology of a switch magnetic base, and particularly to a switch magnetic base for the field of wire electrical discharge machining. Background Art

[0002] When machining small parts by wire electrical discharge machining, it is very convenient to use a switch magnetic base (hereinafter referred to as a magnetic base) to hold and fix the parts. Now the magnetic base has become a commonly used tool for wire electrical discharge machining. For the existing structure of the magnetic base, reference can be made to the "A Multifunctional Magnetic Base" disclosed in the Chinese patent with the publication number CN208780105U. The magnetic base disclosed in this patent is very commonly used, but its waterproof performance is poor. The wire cutting working fluid is easy to enter the movable gap between the permanent magnet and the soft magnetic shell, and is blocked by the dust deposition of the working fluid. The rotation or movement between the permanent magnet and the shell will become more and more stuck, and finally it will be scrapped due to inability to move. The internal structure of the existing magnetic base is as Figure 1 shown. The external shape of this permanent magnet combination is smaller than the inner hole and is concave in the inner hole, making it easy to enter and store water. Water is easy to enter the inner hole from top to bottom and is also easy to deposit dust. This kind of magnetic base is easy to get stuck and scrapped after being drenched with water for a long time.

[0003] There is also another product similar to the magnetic base in function called a permanent magnet chuck, such as the "A Rectangular Permanent Magnet Chuck" disclosed in the Chinese patent application with the publication number CN106425625A. This permanent magnet chuck has the following defects compared with the aforementioned switch magnetic base: 1. The structure is relatively complex and the cost is expensive, and its price is about ten times more expensive; 2. The external dimensions are bulky and inconvenient to use; 3. The magnetic density is low, and it is not as good as the switch magnetic base in holding small parts. Due to the above defects, its application range in the field of wire electrical discharge machining is limited. Summary of the Invention

[0004] The object of the present invention is to provide a waterproof and dustproof magnetic base aiming at the defects existing in the above-mentioned prior art, which can effectively prevent water and dust, effectively improve the service life and reduce the production cost.

[0005] The technical solution adopted by the present invention to achieve the above object is as follows: A waterproof and dustproof magnetic base includes a permanent magnet combination body and a soft magnetic body housing. The middle part of the soft magnetic body housing is recessed downward to form an inner hole that does not penetrate the bottom wall of the soft magnetic body housing. The bottom end of the permanent magnet combination body is arranged in the inner hole in the middle of the soft magnetic body housing. The part of the permanent magnet combination body arranged in the inner hole of the soft magnetic body housing is a permanent magnet. An annular boss I that surrounds the edge of the inner hole and extends vertically upward is provided on the inner edge of the upper end surface of the soft magnetic body housing. A circular convex block that protrudes radially outside the inner hole is provided at the top end of the permanent magnet combination body. An annular boss II that extends downward is provided on the outer edge of the bottom end of the circular convex block. An annular groove is formed between the inner side wall of the annular boss II and the outer surface of the upper section of the permanent magnet. When the permanent magnet combination body is installed in the inner hole in the middle of the soft magnetic body housing, the annular boss I is located in the annular groove, and the annular boss II is located outside the annular boss I.

[0006] A further technical solution of the present invention is that the annular boss II is closely attached to the outside of the annular boss I, and the bottom end of the annular boss II is located below the top end of the annular boss I in the vertical direction.

[0007] A further technical solution of the present invention is that the circular convex block at the top end of the permanent magnet combination body is formed by extending upward and then outward from the top end of the permanent magnet positioned in the inner hole of the soft magnetic body housing, and the annular boss II is formed by vertically extending downward from the outer edge of the bottom end of the circular convex block.

[0008] A further technical solution of the present invention is that the circular convex block at the top end of the permanent magnet combination body is a circular metal ring connected to the outer edge of the top end of the permanent magnet. The permanent magnet is positioned in the middle hole of the circular metal ring to form the permanent magnet combination body, and the annular boss II is formed by vertically extending downward from the outer edge of the bottom end of the circular metal ring.

[0009] A further technical solution of the present invention is that a positioning groove I that is recessed inward is provided on the outer surface of the circular convex block at the top end of the permanent magnet combination body. A permanent magnet combination body upper limit block that extends outward is assembled in the positioning groove I. A positioning groove II that is recessed downward is provided on the upper end surface of the soft magnetic body housing outside the annular boss I. A soft magnetic body housing upper limit block that extends upward is assembled in the positioning groove II. When the permanent magnet combination body rotates, the soft magnetic body housing upper limit block can block the permanent magnet combination body upper limit block to limit the rotation angle of the permanent magnet combination body.

[0010] A further technical solution of the present invention is that a strip-shaped handle for facilitating the rotation of the permanent magnet combination body is connected to the top end of the permanent magnet combination body.

[0011] The waterproof and dustproof magnetic base of the present invention has the following beneficial effects: An annular boss I is provided at the inner edge of the upper end of the inner hole of the soft magnetic body housing. There is a height difference between the annular boss I and the upper end surface of the soft magnetic body housing, that is, it is higher near the opening of the inner hole and lower away from the opening of the inner hole, so that water will not flow back into the inner hole; An annular boss II extending downward is provided at the upper end of the permanent magnet combination body. The annular boss II covers the orifice of the inner hole to prevent water and dust from entering the inner hole.

[0012] The following further describes a waterproof and dustproof magnetic base of the present invention with reference to the drawings and embodiments. Description of the Drawings

[0013] Figure 1 is a schematic diagram of the internal structure of a prior art magnetic base; Figure 2 is a schematic diagram of the structure of the first embodiment of a waterproof and dustproof magnetic base of the present invention; Figure 3 is Figure 2 a schematic diagram of the structure of the permanent magnet combination body of the waterproof and dustproof magnetic base; Figure 4 is Figure 2 a schematic diagram of the structure of the soft magnetic body housing of the waterproof and dustproof magnetic base; Figure 5 is a schematic diagram of the structure of the second embodiment of a waterproof and dustproof magnetic base of the present invention; Figure 6 is Figure 5 a schematic diagram of the structure of the permanent magnet combination body of the waterproof and dustproof magnetic base; Figure 7 is Figure 5 a schematic diagram of the structure of the soft magnetic body housing of the waterproof and dustproof magnetic base.

[0014] Explanation of the reference numerals in the drawings: 1 - permanent magnet combination body, 2 - soft magnetic body housing, 3 - inner hole, 4 - annular boss II, 5 - circular ring-shaped convex block, 6 - annular boss I, 7 - annular groove, 8 - upper end surface of the soft magnetic body housing, 9 - upper limit block of the soft magnetic body housing, 10 - upper limit block of the permanent magnet combination body, 11 - handle, 12 - positioning groove I, 13 - positioning groove II. Detailed Embodiments Embodiment

[0015] As Figures 2 to 4As shown in the figure, a waterproof and dustproof magnetic base of the present invention includes a permanent magnet combination 1 and a soft magnetic body housing 2. The middle part of the soft magnetic body housing 2 is recessed downward to form a circular inner hole 3 that does not penetrate the bottom wall of the soft magnetic body housing 2, that is, the inner hole 3 is a blind hole. The bottom end of the permanent magnet combination 1 is arranged in the inner hole 3 in the middle of the soft magnetic body housing 2. The part of the permanent magnet combination 1 arranged in the inner hole 3 of the soft magnetic body housing 2 is a permanent magnet, and the permanent magnet is a cylinder. The outer diameter of the permanent magnet of the cylinder is slightly smaller than the aperture of the inner hole 3, and the permanent magnet can rotate freely in the inner hole 3.

[0016] As Figure 4 shown, an annular boss I 6 that surrounds the edge of the inner hole 3 and extends vertically upward is provided on the inner edge of the upper end face 8 of the soft magnetic body housing. The annular boss I 6 protrudes from the upper end face 8 of the soft magnetic body housing in the vertical direction. As Figure 2 、 3 shown, a circular ring-shaped protrusion 5 that protrudes radially outside the inner hole 3 is provided at the top end of the permanent magnet combination 1. An annular boss II 4 that extends downward is provided on the outer edge of the bottom end of the circular ring-shaped protrusion 5. An annular groove 7 is formed between the inner side wall of the annular boss II 4 and the outer surface of the upper section of the permanent magnet. In this embodiment, the circular ring-shaped protrusion 5 at the top end of the permanent magnet combination 1 is formed by extending upward and then outward from the top end of the permanent magnet positioned in the inner hole 3 of the soft magnetic body housing 2. The annular boss II 4 is formed by vertically arranging and extending downward from the outer edge of the bottom end of the circular ring-shaped protrusion 5, that is, the annular boss II 4, the circular ring-shaped protrusion 5 and the permanent magnet are an integral structure processed from the same material. The permanent magnet combination 1 can be made of ferrite, and the soft magnetic body housing 2 can be made of iron and aluminum like a traditional magnetic watch base.

[0017] As Figure 2 shown, when the permanent magnet combination 1 is installed in the inner hole 3 in the middle of the soft magnetic body housing 2, the annular boss I 6 is located in the annular groove 7, the annular boss II 4 is located outside the annular boss I 6, and the annular boss II 4 is closely attached to the outside of the annular boss I 6. In the vertical direction, the bottom end of the annular boss II 4 is located below the top end of the annular boss I 6, that is, the annular boss I 6 and the annular boss II 4 are staggered in the vertical direction. In this way, water or dust is not easily introduced into the inner hole 3, and it is also very convenient to insert and remove the permanent magnet combination 1 from the inner hole 3. The permanent magnet combination 1 is no longer stuck due to dust and deterioration, and the dustproof and waterproof problems of this type of magnetic base are completely solved. Embodiment

[0018] As Figures 5 to 7As shown in the figure, the difference from the first embodiment is as follows: The circular bump 5 at the top of the permanent magnet combination 1 is a circular metal ring connected to the outer edge of the top of the permanent magnet. The permanent magnet is positioned in the middle hole of the circular metal ring to form the permanent magnet combination 1. The annular boss II 4 is vertically provided and extends downward from the outer edge of the bottom end of the circular metal ring, that is, the circular bump 5 and the permanent magnet form an integral structure through assembly. A strip-shaped handle 11 for facilitating the rotation of the permanent magnet combination 1 is connected to the top of the permanent magnet combination 1. The handle 11 can be processed from an aluminum rod. The handle 11 and the circular bump 5 can be an integral structure connected as one body, or a split structure assembled as one body. The handle 11 is provided to facilitate the rotation of the permanent magnet combination 1. In addition, a positioning groove I 12 recessed inward is provided on the outer surface of the circular bump 5 at the top of the permanent magnet combination 1. A permanent magnet combination upper limit block 10 extending outward is assembled in the positioning groove I 12. In this embodiment, the positioning groove I 12 is an internal thread hole, and the permanent magnet combination upper limit block 10 is a screw rod with a thread provided on the inner side section. The permanent magnet combination upper limit block 10 can be directly screwed into the positioning groove I 12 to connect with the positioning groove I 12. Only one permanent magnet combination upper limit block 10 is schematically shown in the figure, and two permanent magnet combination upper limit blocks 10 are horizontally provided on the permanent magnet combination 1 and are distributed at about 90 degrees. A positioning groove II 13 is recessed downward on the upper end surface 8 of the soft magnetic body housing 2 outside the annular boss I 6 of the soft magnetic body housing. A soft magnetic body housing upper limit block 9 extending upward is assembled in the positioning groove II 13. In this embodiment, the positioning groove II 13 is an internal thread hole, and the soft magnetic body housing upper limit block 9 is a screw rod with a thread provided on the lower section. The soft magnetic body housing upper limit block 9 can be directly screwed into the positioning groove II 13 to connect with the positioning groove II 13. Only one soft magnetic body housing upper limit block 9 is provided in this embodiment. When the permanent magnet combination 1 rotates, the soft magnetic body housing upper limit block 9 can block the permanent magnet combination upper limit block 10 to limit the rotation angle of the permanent magnet combination 1, which is convenient for quickly positioning the maximum and minimum positions of the magnetic force. Rotate the permanent magnet combination. When one permanent magnet combination upper limit block 10 touches the soft magnetic body housing upper limit block 9, the magnetic attraction resultant force is the largest; rotate the permanent magnet combination in the reverse direction. When the other permanent magnet combination upper limit block 10 touches the soft magnetic body housing upper limit block 9, the magnetic attraction resultant force is the smallest. This is convenient for quickly positioning the maximum and minimum positions of the magnetic force. Other structures and usage methods are the same as those in the first embodiment and will not be described in detail here. Its implementation can also achieve the technical effects of the first embodiment.

[0019] The above embodiments are only the preferred embodiments of the present invention. The structure of the present invention is not limited to the forms listed in the above embodiments. Any modifications, equivalent replacements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A waterproof and dustproof magnetic seat, comprising a permanent magnet assembly (1) and a soft magnetic shell (2), wherein the middle portion of the soft magnetic shell (2) is recessed downward and provided with an inner hole (3) that does not penetrate the bottom wall of the soft magnetic shell (2), the bottom end of the permanent magnet assembly (1) is arranged in the inner hole (3) in the middle portion of the soft magnetic shell (2), and the portion of the permanent magnet assembly (1) arranged in the inner hole (3) of the soft magnetic shell (2) is a permanent magnet, characterized in that: The inner edge of the upper end surface (8) of the soft magnetic shell is provided with an annular boss I (6) surrounding the edge of the inner hole (3) and extending vertically upward; the top of the permanent magnet assembly (1) is provided with an annular convex block (5) radially protruding outside the inner hole (3); the outer edge of the bottom end of the annular convex block (5) is provided with an annular boss II (4) extending downward; the inner side wall of the annular boss II (4) and the outer surface of the upper section of the permanent magnet form an annular groove (7); when the permanent magnet assembly (1) is installed in the middle inner hole (3) of the soft magnetic shell (2), the annular boss I (6) is located in the annular groove (7), and the annular boss II (4) is located outside the annular boss I (6).

2. A waterproof and dustproof magnetic base as claimed in claim 1, characterized in that: The annular boss II (4) is closely attached to the outer side of the annular boss I (6), and in the vertical direction, the bottom end of the annular boss II (4) is located below the top end of the annular boss I (6).

3. A waterproof and dustproof magnetic base as claimed in claim 1, characterized in that: The annular protrusion (5) at the top of the permanent magnet assembly (1) is formed by the top of the permanent magnet positioned in the inner hole (3) of the soft magnetic shell (2) extending upward and then extending outward, and the annular boss II (4) is formed by the outer edge of the bottom end of the annular protrusion (5) being vertically provided and extending downward.

4. The waterproof and dustproof magnetic base according to claim 1, characterized in that: The annular protrusion (5) at the top of the permanent magnet assembly (1) is a circular metal ring connected to the outer edge of the top of the permanent magnet. The permanent magnet is positioned in the middle hole of the circular metal ring to form the permanent magnet assembly (1). The annular boss II (4) is formed by vertically extending downward from the outer edge of the bottom end of the circular metal ring.

5. A waterproof and dustproof magnetic base as claimed in claim 3 or 4, characterized in that: The outer surface of the annular protrusion (5) at the top of the permanent magnet assembly (1) is provided with an inwardly recessed positioning groove I (12), and an outwardly extending permanent magnet assembly upper limit block (10) is mounted in the positioning groove I (12). The upper end surface (8) of the soft magnetic shell outside the annular boss I (6) is recessed downwardly and provided with a positioning groove II (13), and an upwardly extending soft magnetic shell upper limit block (9) is mounted in the positioning groove II (13). When the permanent magnet assembly (1) rotates, the soft magnetic shell upper limit block (9) can block the permanent magnet assembly upper limit block (10) to limit the rotation angle of the permanent magnet assembly (1).

6. A waterproof and dustproof magnetic base as claimed in claim 3 or 4, characterized in that: The top of the permanent magnet assembly (1) is connected to a strip-shaped handle (11) for facilitating the rotation of the permanent magnet assembly (1).

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