Tool for polarity marking of radial magnetizing magnet

Abstract

The tool comprises a tool body, an auxiliary magnet and a line drawing plate, the upper portion of the tool body is provided with a plurality of containing grooves used for containing the magnetizing magnets, and a center line of each containing groove is a preset boundary; a plurality of auxiliary magnets are arranged on the lower portion of the tool body, and polarity boundaries of the auxiliary magnets are vertically aligned with preset boundaries. One side face of the line drawing plate is a line drawing face, the line drawing plate is arranged on the tool body so that the line drawing face can be aligned with a preset boundary line, the polarity boundary line of the magnetizing magnet is drawn along the line drawing face, the N-pole boundary line and the S-pole boundary line can be accurately marked, and the line drawing qualification rate and the machining efficiency of products are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of polarity marking, in particular to a tool used for polarity marking of radially magnetized magnets. Background Art

[0002] Sintered NdFeB magnets generally come in several shapes, including square, cylindrical, ring, and tile. Cylindrical magnets are commonly magnetized using two methods: radial and axial. Axial magnetization applies the magnetic field along the magnet's axial direction. After axial magnetization, the magnetic field is parallel to the magnet's axis. This magnetization method is commonly used with cylindrical magnets and is primarily used for attracting products and exciting components. Radial magnetization applies the magnetic field along the magnet's radial direction and is primarily suitable for sheet or ring-shaped magnets. After radial magnetization, the magnetic field is perpendicular to the magnet's axis. This magnetization method is commonly used in motor rotors, disk drives, and other applications. After magnetization, this type of magnet requires marking on the magnet surface. The purpose of this marking is to accurately mark the boundary between the north and south poles, thereby defining the distribution areas of the north and south poles, facilitating subsequent assembly and use of the magnet.

[0003] like Figure 1 As shown, the existing line drawing method is to first arrange multiple magnetized magnets in a way that one N pole is attracted to another S pole, and naturally straighten them under the action of gravity. Then, the magnets are placed on a special line drawing tool in this arrangement to draw lines. Since the magnets to be marked are round and the surface of the finished product is relatively smooth, after the arranged magnets are placed on the line drawing tool, the N pole of the magnet and the S pole of another adjacent magnet cannot be accurately placed in a way that the farthest end of the N pole (the farthest end from the polarity dividing line) is attracted to the farthest end of the S pole. For specific placement, please refer to Figure 1 At this time, the line marking can only be drawn to the boundary position of the circular surface, and the mark cannot be accurately drawn to the boundary position of the N and S poles. Figure 1 It can be seen that line A is the marked line, and line B is the actual dividing line between the N and S poles of the magnet. There is a certain angle between line A and line B. Therefore, when using this line drawing method, in the actual production and use process, the magnet products produced have a certain risk of being unqualified, which affects the subsequent assembly process and use. Moreover, in the actual production process, after the batches are drawn, they must be inspected with a magnetic polarity sheet. If the inspection fails, rework is required, which prolongs the processing cycle and has low processing efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide a tool for marking the polarity of radially magnetized magnets, which can more accurately mark the boundary line between the N and S poles and improve the product's line marking qualification rate and processing efficiency.

[0005] To achieve the above-mentioned purpose, the solution of the present invention is: a tool for marking the polarity of radially magnetized magnets, comprising a tool body, auxiliary magnets, and a drawing board, wherein the upper part of the tool body is provided with a plurality of accommodating grooves for placing the magnetized magnets, and a center line of the accommodating groove is a preset dividing line; the lower part of the tool body is provided with a plurality of auxiliary magnets, and the polarity dividing lines of the auxiliary magnets are aligned with the preset dividing line up and down; one side of the drawing board is a drawing surface, and the drawing board is placed on the tool body so that the drawing surface is aligned with the preset dividing line, and the polarity dividing line of the magnetized magnet is drawn along the drawing surface.

[0006] Furthermore, line drawing grooves are provided on both sides of the tool body at positions corresponding to the preset dividing lines. When both ends of the line drawing board are placed in the line drawing grooves, the line drawing surface is aligned with the preset dividing line.

[0007] Furthermore, one side of the line drawing groove is a vertical abutment groove surface, which is aligned with a preset dividing line, and the other side of the line drawing groove is tilted upward and connected with the adjacent line drawing groove to form a stepped arrangement; the bottom surface of the line drawing groove is flush with the top surface of the accommodating groove, and the side of the line drawing board facing away from the line drawing surface is tilted downward toward the side of the line drawing surface, and the line drawing surface abuts against the abutment groove surface, so that the bottom edge of the line drawing surface is placed on the top surface of the magnetized magnet and coincides with the polarity dividing line of the magnetized magnet.

[0008] Furthermore, there are multiple accommodating grooves, and the magnetized magnets are placed in the accommodating grooves in a manner that the N poles and S poles of adjacent magnets correspond to each other, and the N pole and S pole of the auxiliary magnet correspond to the S pole and N pole of the magnetized magnet respectively.

[0009] Furthermore, an opening is provided between adjacent accommodating grooves, and the opening communicates with two adjacent accommodating grooves and enables two adjacent magnetized magnets to be magnetically attracted and connected.

[0010] Furthermore, the tooling body is provided with a plurality of receiving slots arranged in a matrix, and the plurality of receiving slots are arranged in multiple rows along the length direction of the tooling body, the preset dividing line is parallel to the width direction of the tooling body, the auxiliary magnets are rectangular magnets and are arranged in a row along the length direction of the tooling body, the polarity dividing line of each auxiliary magnet is aligned with the preset dividing line of each row of receiving slots, and the number of auxiliary magnets is the same as the number of rows of receiving slots.

[0011] Furthermore, the number of rows of the accommodating grooves is single row or multiple rows.

[0012] Furthermore, the magnetizing magnet is a cylindrical or annular magnet, and the shape of the accommodating groove matches the shape of the magnetizing magnet.

[0013] Furthermore, a receiving cavity for placing the auxiliary magnet is provided at the lower part of the tool body, and a bottom plate is provided below the receiving groove of the tool body. The bottom plate and the tool body are fixed by screws to cover the auxiliary magnet in the receiving cavity.

[0014] Furthermore, the tool body and the drawing board are both made of bakelite.

[0015] After adopting the above solution, the beneficial effects of the utility model are:

[0016] The utility model provides an auxiliary magnet at the lower part of the tooling body. The auxiliary magnet has a clear polarity dividing line, and the polarity dividing line is aligned up and down with the preset dividing line of the accommodating groove. After the magnetized magnet is placed in the accommodating groove, the tooling body is gently shaken. Since the N pole of the auxiliary magnet will attract the S pole of the magnetizing magnet and repel the N pole of the magnetizing magnet, the N level and S level of the magnetizing magnet will be aligned up and down with the S pole and N pole of the auxiliary magnet respectively. Therefore, the magnetizing magnet will automatically adjust to a position where its polarity dividing line is aligned up and down with the polarity grading line of the auxiliary magnet, and then the polarity dividing line of the magnetizing magnet will coincide with the preset dividing line. Then, the drawing board is placed on the tooling body, the drawing surface is aligned with the preset dividing line, and the polarity dividing line of the magnetizing magnet can be accurately drawn by drawing along the drawing surface to complete the marking. In addition, since the distribution of the N pole and S pole of the auxiliary magnet is clear, the distribution of the N pole and S pole of the magnetizing magnet can also be known. After drawing the marking line, the N pole and S pole of the magnetizing magnet can be marked on both sides of the marking line.

[0017] Therefore, the marking tooling designed by the present invention stabilizes the marking position of the magnetized magnet, and the marked line will not deviate significantly from the polarity dividing line of the magnetized magnet. The overall position of the N pole and the S pole of the magnetized magnet can be accurately marked, eliminating the risk of defective products flowing out during batch production, improving the qualified rate of product marking, reducing the process of inspecting poor marking positions and reworking, shortening the processing cycle, and improving processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the existing line drawing tool;

[0019] Figure 2 This is a schematic structural diagram of an embodiment of the present utility model;

[0020] Figure 3 This is an exploded view of an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the tooling body of an embodiment of the utility model Figure 1 ;

[0022] Figure 5This is a schematic diagram of the structure of the tooling body of an embodiment of the utility model Figure 2 ;

[0023] Figure 6 This is a schematic structural diagram of another embodiment of the present utility model;

[0024] Figure 7 This is an exploded view of another embodiment of the present invention.

[0025] Description of labels:

[0026] 1. Tool body; 11. Accommodation groove; 12. Preset dividing line; 13. Opening; 14. Line drawing groove; 141. Abutment groove surface; 15. Raised edge; 16. Accommodation cavity; 17. Threaded hole; 2. Auxiliary magnet; 3. Line drawing board; 31. Line drawing surface; 4. Magnetized magnet; 5. Bottom plate; 51. Through hole. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "middle", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this application.

[0029] like Figure 2-7As shown, the utility model provides a tool for marking the polarity of radially magnetized magnets, including a tool body 1, an auxiliary magnet 2, and a drawing board 3. The upper part of the tool body 1 is provided with a plurality of accommodating grooves 11 for placing magnetized magnets 4. The drawing tool of the utility model is used to draw lines on cylindrical magnets after radial magnetization. The shape of the accommodating groove 11 is a circular groove that cooperates with the magnetized magnet 4. A center line of the accommodating groove 11 is selected as a preset dividing line 12. The preset dividing line 12 is used to simulate the position of the polarity dividing line of the preset magnetized magnet 4, and then the positions of the auxiliary magnet 2 and the drawing board 3 are set with reference to the preset dividing line 12. Specifically, a plurality of auxiliary magnets 2 are provided at the lower part of the tooling body 1, and the polarity dividing line of the auxiliary magnets 2 is aligned with the preset dividing line 12. After the magnetizing magnet 4 is placed in the accommodating groove 11, the tooling body 1 is gently shaken. Since the N pole of the auxiliary magnet 2 will be attracted to the S pole of the magnetizing magnet 4 and repelled from the N pole of the magnetizing magnet 4, the magnetizing magnet 4 will be rotated to a position where its polarity dividing line is aligned with the polarity dividing line of the auxiliary magnet 2, so that the polarity dividing line of the magnetizing magnet 4 coincides with the preset dividing line 12. It should be noted that in order for the magnetism of the auxiliary magnet 2 to affect the magnetizing magnet 4, the distance between the auxiliary magnet 2 and the magnetizing magnet 4 cannot be set too large. Then use the drawing board 3 to draw the polarity dividing line of the magnetized magnet 4. One side of the drawing board 3 is the drawing surface 31. Place the drawing board 3 on the tooling body 1, align the drawing surface 31 of the drawing board 3 with the preset dividing line 12, and use a marker, paint pen, etc. to draw a line along the drawing surface 31 to accurately draw the polarity dividing line of the magnetized magnet 4 and complete the marking. In addition, since the distribution of the N pole and S pole of the auxiliary magnet 2 is clear, and the N pole and S pole of the auxiliary magnet 2 correspond to the S pole and N pole of the magnetizing magnet 4 respectively, the distribution of the N pole and S pole of the magnetizing magnet 4 can also be known. After drawing the marking line, the N pole and S pole of the magnetizing magnet 4 can be marked on both sides of the marking line. For example, the N pole can be painted red and the S pole can be painted blue. The drawing board 3 is used to facilitate coloring the surface of the N and S poles of the magnetizing magnet 4. In addition to the coloring marks, other types of marks can be made on the N and S poles by laser engraving, etc. Other marking methods such as laser engraving do not require the assistance of the drawing board 3.

[0030] Furthermore, the line drawing work of the present invention can also be applied to a ring-shaped magnetized magnet 4, and the receiving groove 11 is an annular groove.

[0031] Key references Figure 2 and Figure 6The accommodating groove 11 can be provided with one or more accommodating grooves 11. When multiple accommodating grooves 11 are provided, the accommodating grooves 11 are arranged in a matrix. The magnetized magnets 4 can be placed in the accommodating groove 11 in a manner that the N poles and S poles of the adjacent magnets correspond to each other. The N pole and S pole of the auxiliary magnet 2 correspond to the S pole and N pole of the magnetized magnet 4 respectively. This arrangement is convenient for taking the magnetized magnet 4 and for batch marking. When magnetizing, the magnets are arranged in a string and enter the magnetizer for magnetization. After magnetization, they are also arranged in a string from the magnetizer. The string of magnets coming out of the magnet machine after magnetization is arranged in a way that the N poles and S poles of adjacent magnets are attracted and connected. After magnetization, the magnets are placed in the accommodating groove 11 in this way. The polarity dividing line of the magnetized magnet 4 will not differ too much from the polarity dividing line of the auxiliary magnet 2. The magnetized magnet 4 can be adjusted into place with only a slight deflection, further reducing the error between the marking line and the actual polarity dividing line of the magnetized magnet 4. It is also convenient to take and place the magnetized magnet 4, and to identify the N and S pole distribution of the magnetized magnet 4. In addition, an opening 13 may be provided between adjacent receiving grooves 11 so that two adjacent receiving grooves 11 are connected. This arrangement enables the two adjacent magnetized magnets 4 to be attracted and connected after being placed in the receiving grooves 11. The horizontal magnetic force of the adjacent magnetized magnets 4 can also help align the polarity dividing line of the magnetized magnets 4 with the preset dividing line 12. Then, pushed by the vertical magnetic force of the auxiliary magnet 2, the farthest end of the N pole of the magnetized magnet 4 (the farthest end from the polarity dividing line) is bound to be able to connect with the farthest end of the S pole of another adjacent magnetized magnet 4.

[0032] Key references Figure 2-4 On both sides of the tool body 1, at positions corresponding to the preset dividing line 12, there are provided drawing grooves 14. When the two ends of the drawing board 3 are placed in the drawing grooves 14, the drawing surface 31 is aligned with the preset dividing line 12. The drawing grooves 14 can easily align the drawing surface 31 with the preset dividing line 12. The drawing grooves 14 can also position the drawing board 3 to prevent the drawing board 3 from shifting during drawing. The preset dividing line 12 can be parallel to the width direction of the tool body 1. In this case, the drawing grooves 14 are provided on opposite sides of the width direction of the work body. For example, taking the length direction of the tool body 1 as the left and right direction, the front and rear sides of the work body are provided with convex edges 15. The drawing grooves 14 are provided on the convex edges 15. The bottom surface of the drawing grooves 14 is flush with the top surface of the accommodating groove 11, so that the drawing board 3 can be placed on the magnetized magnet 4, and the bottom edge of the drawing surface 31 can be aligned with the preset dividing line 12.

[0033] The line drawing groove 14 can be as follows Figure 1As shown, a rectangular groove is provided as in the existing marking tooling, and one side of the marking plate 3 extends downward to cooperate with the rectangular groove. In this arrangement, the marking plate 3 must be taken out upward, and then the marking plate 3 is moved to the top of another marking groove 14, and then placed downward into the marking groove 14. The marking plate 3 is not convenient for replacing the marking groove 14. For this reason, the utility model sets one side of the marking groove 14 (in Figure 2 The right side is set as a vertical abutment groove surface 141, which is aligned with the preset dividing line 12. The other side of the line drawing groove 14 (at Figure 2 The drawing board 3 is arranged in a stepped manner (left side in the middle) and is tilted upward and connected to the adjacent drawing groove 14 to form a stepped arrangement. The side of the drawing board 3 facing away from the drawing surface 31 is tilted downward to the side of the drawing surface 31 to cooperate with the drawing groove 14. When the drawing board 3 is inserted into the drawing groove 14, the drawing surface 31 abuts against the abutting groove surface 141. The bottom edge of the drawing surface 31 is placed on the top surface of the magnetized magnet 4 and coincides with the polarity dividing line of the magnetized magnet 4. By drawing along the bottom edge of the drawing surface 31, the polarity dividing line of the magnetized magnet 4 can be accurately drawn. Moreover, by sliding the drawing board 3 to the left along the other side of the tilt, it can be smoothly slid into the next drawing groove 14. The drawing groove 14 can be quickly replaced, which is convenient for batch drawing and reduces the time waste caused by adjusting the position of the drawing board 3. In addition, the other side of the drawing groove 14 is tilted and then horizontally set to connect with the next drawing groove 14. The horizontal part facilitates the sliding transition of the drawing board 3.

[0034] Key references Figure 3 and Figure 5 The lower part of the tool body 1 is provided with a receiving cavity 16 for placing the auxiliary magnet 2. The receiving cavity 16 can be set according to the shape of the auxiliary magnet 2 after being arranged. For example, if the auxiliary magnet 2 is a rectangular magnet and the auxiliary magnet 2 is arranged in a rectangular shape, the receiving cavity 16 can be set to a rectangular cavity shape that can just accommodate all the auxiliary magnets 2, so as to facilitate the installation of the auxiliary magnet 2. Furthermore, the tool body 1 is provided with a bottom plate 5 below the receiving groove 11. The bottom plate 5 is fixed to the tool body 1 so as to cover the auxiliary magnet 2 in the receiving cavity 16, preventing the auxiliary magnet 2 from escaping from the receiving cavity 16, and facilitating the transportation and removal of the entire tool. Moreover, the bottom plate 5 and the tool body 1 can be connected by screws, that is, the tool body 1 is provided with a threaded hole 17 on the outer periphery of the receiving cavity, and a through hole 51 is correspondingly provided on the bottom plate 5 to cooperate with the threaded hole 17 and for the screw to pass through. The use of screw connection facilitates the disassembly and assembly of the auxiliary magnet 2. The screws used for connection are preferably made of non-magnetic material to avoid magnetic interference from the auxiliary magnet 2.

[0035] Key references Figure 2-5In one embodiment, multiple accommodating slots 11 are arranged in multiple rows along the length of the tool body. The number of accommodating slots 11 is only one row, and each row contains only one accommodating slot 11. The auxiliary magnets 2 are also arranged in a row along the length of the tool body 1, and the number of auxiliary magnets 2 is the same as the accommodating slots 11. The shape of the auxiliary magnets 2 is not limited, as long as the polarity dividing line of each auxiliary magnet 2 is aligned with the predetermined dividing line 12 of each accommodating slot 11. However, the auxiliary magnets 2 are preferably rectangular magnets to facilitate arrangement and placement and the setting of the accommodating cavity 16.

[0036] Key references Figure 6-7 In another embodiment, multiple accommodating grooves 11 are arranged in multiple rows along the length direction of the tooling body 1, and the number of columns of the accommodating grooves 11 is multiple, and the preset dividing lines 12 of the accommodating grooves 11 on the same row are on the same straight line. The auxiliary magnets 2 are long rectangular magnets and are arranged in a row along the length direction of the tooling body 1. The polarity dividing line of each auxiliary magnet 2 can be aligned with the preset dividing line 12 of each row of accommodating grooves 11. The number of auxiliary magnets 2 can be the same as the number of columns of the accommodating grooves 11. There is no need to set a large number of auxiliary magnets 2, which saves the installation time of the auxiliary magnets 2. Moreover, in this embodiment, the marking lines of a column of magnetized magnets 4 can be drawn at one time, further improving the processing efficiency.

[0037] In addition, as a preferred embodiment, the tool body 1 and the drawing board 3 are both made of bakelite, or other non-magnetic materials; bakelite has many advantages such as non-magnetic conductivity, low cost, high strength, and strong plasticity, making it the best choice for this embodiment.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the design of this case. Any equivalent changes made based on the key design of this case shall fall within the scope of protection of this case.

Claims

1. A tool for marking the polarity of radially magnetized magnets, characterized in that: The utility model comprises a tooling body, auxiliary magnets and a drawing board. The upper part of the tooling body is provided with a plurality of accommodating grooves for placing magnetized magnets, and a center line of the accommodating groove is a preset dividing line; the lower part of the tooling body is provided with a plurality of auxiliary magnets, and the polarity dividing lines of the auxiliary magnets are aligned with the preset dividing line up and down; one side of the drawing board is a drawing surface, and the drawing board is placed on the tooling body so that the drawing surface is aligned with the preset dividing line, and the polarity dividing line of the magnetized magnet is drawn along the drawing surface.

2. A tool for marking the polarity of a radially magnetized magnet according to claim 1, characterized in that: Both sides of the tool body are provided with drawing grooves at positions corresponding to the preset dividing lines. When the two ends of the drawing board are placed in the drawing grooves, the drawing surface is aligned with the preset dividing line.

3. A tool for marking the polarity of a radially magnetized magnet according to claim 2, characterized in that: One side of the line drawing groove is a vertical abutment groove surface, which is aligned with a preset dividing line. The other side of the line drawing groove is tilted upward and connected with the adjacent line drawing groove to form a stepped arrangement. The bottom surface of the line drawing groove is flush with the top surface of the accommodating groove. The side of the line drawing plate facing away from the line drawing surface is tilted downward toward one side of the line drawing surface. The line drawing surface abuts against the abutment groove surface, so that the bottom edge of the line drawing surface is placed on the top surface of the magnetized magnet and coincides with the polarity dividing line of the magnetized magnet.

4. A tool for marking the polarity of a radially magnetized magnet according to claim 1, characterized in that: There are multiple accommodating grooves, and the magnetized magnets are placed in the accommodating grooves in a manner that the N poles and S poles of adjacent magnets correspond to each other. The N pole and S pole of the auxiliary magnet correspond to the S pole and N pole of the magnetized magnet respectively.

5. A tool for marking the polarity of a radially magnetized magnet according to claim 4, characterized in that: An opening is provided between adjacent accommodating grooves, and the opening communicates with the two adjacent accommodating grooves and enables the two adjacent magnetized magnets to be magnetically attracted and connected.

6. A tool for marking the polarity of a radially magnetized magnet according to claim 1, characterized in that: The tooling body is provided with a plurality of accommodating grooves arranged in a matrix, and the plurality of accommodating grooves are arranged in multiple rows along the length direction of the tooling body, and the preset dividing line is parallel to the width direction of the tooling body. The auxiliary magnets are rectangular magnets and are arranged in a row along the length direction of the tooling body. The polarity dividing line of each auxiliary magnet is aligned with the preset dividing line of each row of accommodating grooves, and the number of auxiliary magnets is the same as the number of rows of accommodating grooves.

7. A tool for marking the polarity of a radially magnetized magnet according to claim 6, characterized in that: The number of rows of the accommodating grooves is single row or multiple rows.

8. The tool for marking the polarity of a radially magnetized magnet according to claim 1, characterized in that: The magnetizing magnet is a cylindrical or annular magnet, and the shape of the accommodating groove matches the shape of the magnetizing magnet.

9. The tool for marking the polarity of a radially magnetized magnet according to claim 1, characterized in that: The lower part of the tool body is provided with a receiving cavity for placing the auxiliary magnet. The tool body is provided with a bottom plate below the receiving groove. The bottom plate and the tool body are fixed by screws to cover the auxiliary magnet in the receiving cavity.

10. The tool for polarity marking of radially magnetized magnets according to claim 1, characterized in that: The tool body and the drawing board are both made of bakelite.

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