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 utility model relates to a switch magnetic table seat technology, especially in the field of electric spark wire cutting processing for switch magnetic table seat. BACKGROUND

[0002] When electric spark wire cutting processing small parts, it is very convenient to use switch magnetic table seat (hereinafter referred to as magnetic seat) to hold and fix the parts. Now the magnetic seat is a commonly used tool for electric spark wire cutting processing. The existing magnetic seat structure can refer to the Chinese patent disclosed in the announcement number CN208780105U "a multifunctional magnetic table seat", the magnetic seat disclosed in the patent is very common but the waterproof performance of the magnetic seat is poor, and the wire cutting working fluid is easy to enter the movable gap between the permanent magnet and the soft magnet shell, and is blocked by the dust deposition of the working fluid, the rotation or movement between the permanent magnet and the shell will be more and more stuck, and finally it will be scrapped due to the inactivity. The internal structure of the existing magnetic seat is shown in Figure 1 The permanent magnet combination is smaller than the inner hole, and the recess in the inner hole is easy to store water, and the water is easy to enter the inner hole from top to bottom, and the dust is easy to deposit. Such magnetic seat is easy to be stuck and scrapped by long-time water.

[0003] There is another product similar to the function of the magnetic seat called permanent magnet suction disc, such as the Chinese patent application disclosed in the publication number CN106425625A "a rectangular permanent magnet suction disc", the permanent magnet suction disc has the following defects compared with the foregoing switch magnetic table seat: 1. The structure is relatively complex, and the cost is high, and the price is ten times higher; 2. The size is bulky, and the use is not convenient; 3. The magnetic density is low, and the small parts are not as good as the switch magnetic table seat. Due to the above defects, the use of the permanent magnet suction disc is limited in the field of electric spark wire cutting processing. SUMMARY

[0004] The utility model aims at the defects of the prior art, provides a waterproof dustproof magnetic seat, which can effectively prevent water and dust, effectively improve the service life and reduce the production cost.

[0005] The utility model discloses a waterproof dustproof magnetic base which is characterized in that a soft magnetic body shell is provided with an inner hole in the middle part, and a permanent magnet combination is arranged in the inner hole.

[0006] The further technical scheme of the utility model is that the annular boss II is formed by vertically arranging a downward extending part on the outer edge of the bottom end of the circular ring-shaped boss.

[0007] The further technical scheme of the utility model is that the circular ring-shaped boss on the top end of the permanent magnet combination is formed by extending upward from the top end of the permanent magnet arranged in the inner hole of the soft magnetic body shell and then extending outward.

[0008] The further technical scheme of the utility model is that the circular ring-shaped boss on the top end of the permanent magnet combination is a circular metal ring connected to the outer edge of the top end of the permanent magnet, the permanent magnet is arranged in the middle hole of the circular metal ring to form the permanent magnet combination, and the annular boss II is formed by vertically arranging a downward extending part on the outer edge of the bottom end of the circular metal ring.

[0009] The further technical scheme of the utility model is that the outer surface of the circular ring-shaped boss on the top end of the permanent magnet combination is provided with a positioning recess I concave inward, an upward extending permanent magnet combination upper limiting block is assembled in the positioning recess I, the upper end surface of the soft magnetic body shell outside the annular boss I is concave downward and provided with a positioning recess II, an upward extending soft magnetic body shell upper limiting block is assembled in the positioning recess II, and the soft magnetic body shell upper limiting block can block the permanent magnet combination upper limiting block to limit the rotation angle of the permanent magnet combination when the permanent magnet combination rotates.

[0010] The further technical scheme of the utility model is that a strip-shaped handle is connected to the top end of the permanent magnet combination to facilitate the rotation of the permanent magnet combination.

[0011] The utility model discloses a waterproof dustproof magnetic base has following beneficial effect: the annular boss 1 of surrounding in the inner hole edge is equipped with on the inner hole upper end inner edge of soft magnet shell, and the annular boss 1 generates height difference with the upper end surface of soft magnet shell, that is, close to the inner hole opening high, far from the inner hole opening low, make water not flow into the inner hole, the annular boss 2 of extending downward is equipped with on the upper end of permanent magnet combination, and the annular boss 2 carries out the water and dust cover waterproof and enter the inner hole in the hole mouth of inner hole.

[0012] The utility model discloses a waterproof dustproof magnetic base further makes the following description with the accompanying drawing and embodiment. DRAWINGS

[0013] Figure 1 It is the internal structure schematic diagram of prior art magnetic base;

[0014] Figure 2 It is the structure schematic diagram of the utility model discloses a waterproof dustproof magnetic base embodiment one;

[0015] Figure 3 It is Figure 2 The structure schematic diagram of permanent magnet combination of the waterproof dustproof magnetic base;

[0016] Figure 4 It is Figure 2 The structure schematic diagram of soft magnet shell of the waterproof dustproof magnetic base;

[0017] Figure 5 It is the structure schematic diagram of the utility model discloses a waterproof dustproof magnetic base embodiment two;

[0018] Figure 6 It is Figure 5 The structure schematic diagram of permanent magnet combination of the waterproof dustproof magnetic base;

[0019] Figure 7 It is Figure 5 The structure schematic diagram of soft magnet shell of the waterproof dustproof magnetic base.

[0020] Figure legend explanation: 1-permanent magnet combination, 2-soft magnet shell, 3-inner hole, 4-annular boss 2, 5-circular annular boss, 6-annular boss 1, 7-annular groove, 8-soft magnet shell upper end surface, 9-soft magnet shell upper limit block, 10-permanent magnet combination upper limit block, 11-handle, 12-positioning recess 1, 13-positioning recess 2. DETAILED DESCRIPTION EMBODIMENT

[0021] As Figures 2 to 4As shown, the utility model discloses a waterproof dustproof magnetic base, including permanent magnet combination 1 and soft magnet shell 2, the middle part of soft magnet shell 2 is concave and is equipped with the circular inner hole 3 not penetrating the bottom wall of soft magnet shell 2, i.e. the inner hole 3 is a blind hole. The bottom end of permanent magnet combination 1 is arranged in the inner hole 3 of the middle part of soft magnet shell 2, and the part of permanent magnet combination 1 arranged in the inner hole 3 of soft magnet shell 2 is a permanent magnet, and the permanent magnet is a cylinder, and the outer diameter of the cylinder is slightly smaller than the hole diameter of the inner hole 3, and the permanent magnet can rotate freely in the inner hole 3.

[0022] As Figure 4 shown, the inner edge of the upper end surface 8 of the soft magnet shell is provided with an annular boss I 6 surrounding the edge of the inner hole 3 and extending vertically upward, and the annular boss I 6 protrudes the upper end surface 8 of the soft magnet shell in the vertical direction. Figure 2 、 3 As shown, the top end of the permanent magnet combination 1 is provided with a circular ring-shaped protrusion 5 protruding outward of the inner hole 3 in the radial direction, and the outer edge of the bottom end of the circular ring-shaped protrusion 5 is provided with a downwardly extending annular boss II 4, and the inner side wall of the annular boss II 4 forms an annular groove 7 with the upper segment outer surface 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 upward extension of the top end of the permanent magnet positioned in the inner hole 3 of the soft magnet shell 2 and then outward extension, and the annular boss II 4 is vertically provided with downward extension at the outer edge of the bottom end of the circular ring-shaped protrusion 5, i.e. the annular boss II 4, the circular ring-shaped protrusion 5 and the permanent magnet are an integral structure formed by processing of the same material. The permanent magnet combination 1 can be made of ferrite, and the soft magnet shell 2 can be made of iron and aluminum like the traditional magnetic watch base.

[0023] As Figure 2 shown, when the permanent magnet combination 1 is installed in the inner hole 3 in the middle part of the soft magnet shell 2, the annular boss I 6 is located in the annular groove 7, the annular boss II 4 is located outward of the annular boss I 6, the annular boss II 4 is tightly attached to the outer side of the annular boss I 6, and the bottom end of the annular boss II 4 is located below the top end of the annular boss I 6 in the vertical direction, i.e. 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 easy to enter the inner hole 3, the permanent magnet combination 1 is also very convenient to put in and take out in the inner hole 3, and the permanent magnet combination 1 is no longer stuck due to dust and deterioration, completely solving the dustproof and waterproof problem of this type of magnetic base. Embodiment

[0024] As Figures 5 to 7The difference between the embodiment and the embodiment one is that the annular protrusion 5 at the top end of the permanent magnet assembly 1 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 assembly 1, the annular protrusion II 4 is vertically provided at the outer edge of the bottom end of the circular metal ring to extend downward, that is, the annular protrusion 5 and the permanent magnet are assembled to form an integral structure. A strip-shaped handle 11 is connected to the top end of the permanent magnet assembly 1 to facilitate rotation of the permanent magnet assembly 1. The handle 11 can be processed from an aluminum rod. The handle 11 and the annular protrusion 5 can be an integral structure or a split structure. The handle 11 is provided to facilitate rotation of the permanent magnet assembly 1. In addition, a positioning groove I 12 is provided on the outer surface of the annular protrusion 5 at the top end of the permanent magnet assembly 1, and an upward extending upper limiting block 10 of the permanent magnet assembly is assembled in the positioning groove I 12. In this embodiment, the positioning groove I 12 is an internal thread hole, and the upper limiting block 10 of the permanent magnet assembly is a threaded rod with a thread on the inner side. The upper limiting block 10 of the permanent magnet assembly can be directly screwed into the positioning groove I 12 to connect with the positioning groove I 12. Only one upper limiting block 10 of the permanent magnet assembly is shown in the figure, and two upper limiting blocks 10 of the permanent magnet assembly are provided transversely on the permanent magnet assembly 1 to form a distribution of about 90 degrees. The soft magnetic shell upper limiting block 9 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 shell upper limiting block 9 is a threaded rod with a thread on the lower side. The soft magnetic shell upper limiting block 9 can be directly screwed into the positioning groove II 13 to connect with the positioning groove II 13. Only one soft magnetic shell upper limiting block 9 is provided in this embodiment. When the permanent magnet assembly 1 rotates, the soft magnetic shell upper limiting block 9 can block the upper limiting block 10 of the permanent magnet assembly to limit the rotation angle of the permanent magnet assembly 1, so as to facilitate quick positioning of the maximum and minimum positions of the magnetic force. When rotating the permanent magnet assembly, the magnetic attraction force is the largest when one upper limiting block 10 of the permanent magnet assembly collides with the soft magnetic shell upper limiting block 9. When rotating the permanent magnet assembly in the opposite direction, the magnetic attraction force is the smallest when the other upper limiting block 10 of the permanent magnet assembly collides with the soft magnetic shell upper limiting block 9. In this way, the maximum and minimum positions of the magnetic force can be quickly positioned. The other structures and use methods are the same as those of the embodiment one, and will not be described in detail here. The implementation can also achieve the technical effects of the embodiment one.

[0025] The above embodiments are only preferred embodiments of the present application, and the structure of the present application is not limited to the forms listed in the above embodiments. Any modification, equivalent replacement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A waterproof and dustproof magnetic base, comprising a permanent magnet assembly (1) and a soft magnetic shell (2), wherein a middle portion of the soft magnetic shell (2) is concave downward to form an inner hole (3) which does not penetrate a bottom wall of the soft magnetic shell (2), and a bottom end of the permanent magnet assembly (1) is arranged in the inner hole (3) of the middle portion of the soft magnetic shell (2), and a 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) which surrounds the edge of the inner hole (3) and extends vertically upward, the top end of the permanent magnet assembly (1) is provided with a circular ring-shaped protrusion (5) which protrudes radially outside the inner hole (3), the outer edge of the bottom end of the circular ring-shaped protrusion (5) is provided with a downward extending annular boss II (4), the inner side wall of the annular boss II (4) forms an annular groove (7) with the outer surface of the upper section of the permanent magnet, 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. The waterproof and dustproof magnetic base according to claim 1, characterized in that, The annular boss II (4) is tightly attached to the outside of the annular boss I (6), and the bottom end of the annular boss II (4) is located below the top end of the annular boss I (6) in the vertical direction.

3. The waterproof and dustproof magnetic base according to claim 1, characterized in that, The circular ring-shaped protrusion (5) at the top end of the permanent magnet assembly (1) is formed by extending upward from the top end of the permanent magnet positioned in the inner hole (3) of the soft magnetic shell (2) and then extending outward, and the annular boss II (4) is formed by vertically providing a downward extending portion at the outer edge of the bottom end of the circular ring-shaped protrusion (5).

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

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

6. A waterproof and dustproof magnetic base according to claim 3 or 4, characterized in that, A strip-shaped handle (11) is connected to the top end of the permanent magnet assembly (1) to facilitate rotation of the permanent magnet assembly (1).

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