CN212401908U - Magnetic body bearing device - Google Patents

Abstract

The application discloses magnetic substance bears device, it includes and bears piece and magnetic substance setting element. The bearing piece is provided with a first surface and a second surface which are opposite, the bearing piece is provided with a plurality of magnetic body accommodating grooves, the plurality of magnetic body accommodating grooves are positioned on the first surface, and each magnetic body accommodating groove accommodates a magnetic body. The magnetic body positioning piece is arranged on the second surface of the bearing piece, and the magnetic body positioning piece positions the plurality of magnetic bodies in the plurality of magnetic body accommodating grooves in a magnetic adsorption mode. Set up a plurality of magnetic substance storage tanks on the first surface through holding the piece, set up the magnetic substance setting element in addition on the second surface relative with the first surface, the magnetic substance can not remove wantonly at the first surface by the limiting displacement of magnetic substance storage tank, adsorbs the magnetic substance through the magnetic substance setting element moreover for the magnetic substance is fixed a position in holding the piece. Thereby solve the magnet of prior art and bear packaging structure's structure too complicated, machines and tools difficult operation clamp and get and the too high problem of cost etc..

Description

Magnetic body bearing device

Technical Field

The application relates to the technical field of bearing magnetic bodies, in particular to a magnetic body bearing device.

Background

In conventional electronic devices, magnets are widely used, and in order to improve productivity, magnets of electronic devices are assembled by an automatic assembling machine. The bearing packaging structure of current magnet has magnet plastics pipe package, magnet zinc plate tiling packing and magnet to mould plastics tray packing etc. and magnet plastics pipe package gets the structure too complicated as automatic clamp, and magnet zinc plate tiling packing can't fix a position magnet and make magnet equidistance arrange and lead to automatic machines and tools can't get, and magnet is moulded plastics tray packing and is convenient for press from both sides and get, but magnet is moulded plastics tray cost height and difficult volume production.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a device is born to magnetic substance solves present magnet and bears packaging structure's structure too complicated, the difficult operation clamp of machines and tools and gets and the too high problem of cost etc..

In order to solve the technical problem, the present application is implemented as follows:

provided is a magnetic substance bearing device, including: a bearing part and a magnetic positioning part. The bearing piece is provided with a first surface and a second surface which are opposite, the bearing piece is provided with a plurality of magnetic body accommodating grooves, the plurality of magnetic body accommodating grooves are positioned on the first surface, and each magnetic body accommodating groove accommodates a magnetic body. The magnetic body positioning piece is arranged on the second surface of the bearing piece, and the magnetic body positioning piece positions the plurality of magnetic bodies in the plurality of magnetic body accommodating grooves in a magnetic adsorption mode.

In this application embodiment, set up a plurality of magnetic substance storage tanks on the first surface through bearing the piece, set up the magnetic substance setting element in addition on the second surface relative with the first surface, the magnetic substance can not remove at will on the first surface by the limiting displacement of magnetic substance storage tank, passes through the magnetic substance setting element moreover and adsorbs the magnetic substance for the magnetic substance is fixed a position in bearing the piece. Thereby solve the magnet of prior art and bear packaging structure too complicated, machines and tools difficult operation clamp and get and the too high problem of cost etc..

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a perspective view of a magnetic substance bearing device according to an embodiment of the present application;

fig. 2 is an exploded view of the magnetic body carrying device of fig. 1;

fig. 3 is a bottom view of the magnetic substance bearing device of fig. 1;

fig. 4 is a plan view of the magnetic substance bearing device of fig. 1;

fig. 5 is a side view of the magnetic substance bearing device of fig. 1;

fig. 6 is a sectional view of the magnetic substance bearing device of fig. 5 taken along line a-a;

fig. 7 and 8 are sectional views of the magnetic substance bearing device of fig. 6 before and after stacking, respectively;

fig. 9 is a sectional view of a magnetic substance bearing device according to another embodiment of the present application;

fig. 10 and 11 are sectional views of the magnetic substance bearing device of fig. 9 before and after stacking.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Please refer to fig. 1, fig. 2, fig. 3 and fig. 4, which are a perspective view, an exploded view, a bottom view and a top view of a magnetic carrier according to an embodiment of the present application; as shown in the drawings, the present embodiment provides a magnetic substance carrying device 100, which includes a carrier 10 and a magnetic substance positioning member 20. The supporting member 10 has a first surface 11 and a second surface 12 (please refer to fig. 6), the supporting member 10 has a plurality of magnetic material accommodating slots 13, the plurality of magnetic material accommodating slots 13 are located on the first surface 11, and each magnetic material accommodating slot 13 accommodates the magnetic material M. The magnetic material positioning member 20 is disposed on the second surface 12 of the carrier 10, and the magnetic material positioning member 20 positions the plurality of magnetic materials M in the plurality of magnetic material accommodating grooves 13 by magnetic attraction.

The magnetic substance accommodation groove 13 is a groove formed in the first surface 11. In the present embodiment, as shown in fig. 2, a plurality of magnetic material accommodation grooves 13 are arranged in a matrix on the first surface 11. The shape of each magnetic material accommodating groove 13 can be matched with the shape of the magnetic material M accommodated therein, and the size of each magnetic material accommodating groove 13 can be slightly larger than the magnetic material M accommodated therein, so that the magnetic material M can be accommodated in the magnetic material accommodating groove 13. For example, if the magnetic material M is rectangular, the magnetic material accommodating groove 13 may be a rectangular groove, as shown in fig. 2. In addition, if the magnetic material M is circular, the magnetic material accommodation groove 13 may be a circular groove. The contour of the magnetic material accommodating groove 13 is matched with the magnetic material M, so that the magnetic material M can be kept in the magnetic positioning groove 13 when being accommodated in the magnetic positioning groove 13, and the magnetic material M is prevented from shaking and colliding with the groove wall of the magnetic material accommodating groove 13 during transportation.

As shown in fig. 2, in the present embodiment, the magnetic material receiving slots 13 are rectangular slots, each magnetic material receiving slot 13 has two opposite first sides 131 and two second sides 132 located at the two first sides 131, in the present embodiment, a plurality of magnetic material receiving slots 13 are arranged in a plurality of rows on the first surface 11, the second sides 132 of each magnetic material receiving slot 13 located in the same row are parallel to each other, and the first sides 131 of the magnetic material receiving slots 13 located in the same row are parallel to each other. The first sides 131 of the magnetic substance receiving slots 13 in the same row are parallel to each other and the second sides 132 are parallel to each other. In the present embodiment, each magnetic material receiving slot 13 in each row and the adjacent magnetic material receiving slot 13 are aligned with each other, and each magnetic material receiving slot 13 and the adjacent magnetic material receiving slot 13 are also aligned with each other. Therefore, the first sides 131 of the magnetic material receiving slots 13 in the same row are parallel to each other, and the second sides 132 of the magnetic material receiving slots 13 in adjacent rows are aligned with each other and located on the same line.

In another embodiment, the magnetic body receiving slot is a circular slot that fits a circular magnetic body. The magnetic body accommodating groove of the embodiment has two opposite and arc-shaped sides. The contour of the edge of the magnetic body accommodating groove can be matched with the contour of the edge of the magnetic body.

Referring to fig. 2 again, each magnetic material accommodating slot 13 has a bottom 133, and the magnetic material M can be placed on the bottom 133 of the magnetic material accommodating slot 13 and supported by the bottom 133. The depth of the magnetic material housing groove 13 is greater than the height of the magnetic material M. When the magnetic material M is placed in the magnetic material accommodating slot 13, the magnetic material M does not protrude from the first surface 11 and the adjacent first side 131 and second side 132 limit the magnetic material M, so that the magnetic material M does not move along the first surface 11.

In addition, the carrier 10 further includes a plurality of relief grooves 14, and the relief grooves 14 are respectively disposed on the first sides 131 of the plurality of magnetic material accommodating grooves 13 and respectively communicate with the corresponding magnetic material accommodating grooves 13. In the present embodiment, the receding groove 14 is disposed on the first surface 11, and the receding groove 14 extends from the first side 131 of the magnetic body receiving groove 13 toward a direction away from the magnetic body receiving groove 13, and the extending direction of the receding groove 14 is orthogonal to the first side 131. When the magnetic body M is placed in the magnetic body accommodating slot 13, a part of the side edge of the magnetic body M is exposed from the relief slot 14, so that the relief slot 14 can be used for a tool for clamping the magnetic body M to enter and clamp the magnetic body M. In addition, the width of the side of the abdicating groove 14 parallel to the arrangement direction of the magnetic material accommodating grooves 13 in the same row is smaller than the width of the side of the magnetic material accommodating grooves 13 parallel to the arrangement direction of the same row, as shown in fig. 2, the length of the side of the abdicating groove 14 parallel to the first side 131 is smaller than the length of the first side 131 of the magnetic material accommodating grooves 13. Since the receding groove 14 is disposed at the first side 131 of the magnetic material receiving groove 13, the width of the connection portion between the receding groove 14 and the magnetic material receiving groove 13 corresponds to the length of the side of the receding groove 14 parallel to the first side 131, and as mentioned above, the length of the side of the receding groove 14 parallel to the first side 131 is less than the length of the first side 131 of the magnetic material receiving groove 13, so the width of the connection portion between the receding groove 14 and the magnetic material receiving groove 13 is less than the length of the first side 131. In the present embodiment, the relief groove 14 is a rectangular groove. In addition, in the present embodiment, the relief grooves 14, in which the magnetic material accommodation grooves 13 in the same row communicate, communicate with each other. In addition, in the embodiment, the depth of the receding groove 14 is greater than the depth of the magnetic material accommodating groove 13, so that the automatic machine tool can conveniently extend into the receding groove 14 to clamp the magnetic material M placed in the magnetic material accommodating groove 13. In the embodiment that the magnetic body accommodating groove is circular, the receding groove is connected to the edge of the circular magnetic body accommodating groove. In the present embodiment, the carrier 10 is made by a plastic suction method, or may be injection molded, but is not limited thereto.

Fig. 5 and 6 are a side view of the magnetic material carrier of fig. 1 and a cross-sectional view of the magnetic material carrier of fig. 5 along the line a-a. As shown in the figure, the carrier 10 further has a plurality of positioning ribs 15, the plurality of positioning ribs 15 are disposed on the second surface 12 of the carrier 10, the magnetic positioning member 20 is provided with a plurality of positioning holes 21, and the plurality of positioning ribs 15 are disposed in the plurality of positioning holes 21. The positioning ribs 15 are sized to fit the positioning holes 21 of the magnetic positioning piece 20, so that the magnetic positioning piece 20 is engaged and positioned on the positioning ribs 15 and abuts against the second surface 12 of the carrier 10. For example, in this embodiment, the positioning protrusion 15 is a rectangular parallelepiped, the magnetic positioning element 20 is a magnetic metal plate and is provided with a plurality of rectangular positioning holes 21, the positioning protrusion 15 has two side walls 151 disposed opposite to each other and a top wall 152 connecting the two side walls 151, a distance between the two side walls 151 is slightly smaller than a width of the positioning hole 21, so that the positioning hole 21 can be sleeved on the two side walls 151 of the positioning protrusion 15, and the positioning hole 21 is matched with the positioning protrusion 15, so that the magnetic positioning element 20 is limited by the positioning protrusion 15. In addition, the adhesive may be coated on the second surface 12 of the carrier 10, the magnetic positioning element 20 is bonded to the second surface 12 of the carrier 10 by the adhesive, or the carrier 10 and the magnetic positioning element 20 are locked, and the bonding manner of the magnetic positioning element 20 and the carrier 10 is not limited thereto. The magnetic positioning member 20 and the plurality of magnetic bodies M all generate magnetic attraction to position the magnetic bodies M on the bottom wall 133 of the magnetic accommodating groove 13, and the plurality of magnetic bodies M are not mutually repelled or attracted during transportation, and the magnetic positioning member 20 may be made of a magnetic metal element such as iron, aluminum, zinc or an alloy thereof, or may be a plastic plate with metal on the surface, but is not limited thereto.

In addition, the plurality of positioning protrusions 15 respectively correspond to the plurality of magnetic material accommodating grooves 13 in each row, and each positioning protrusion 15 passes below the plurality of magnetic material accommodating grooves 13 in the corresponding row. As shown in fig. 6, in the present embodiment, the positioning convex strips 15 extend along the arrangement direction of the plurality of magnetic material receiving grooves 13 in each row, and the extending direction of the positioning convex strips 15 intersects with the first side 131, in the present embodiment, the extending direction of the positioning convex strips 15 is orthogonal to the first side 131, and as mentioned above, the relief grooves 14 extend from the first side 131 toward the direction away from the magnetic material receiving grooves 13 and the extending direction thereof is orthogonal to the first side 131, so that the relief grooves 14 communicating with the plurality of magnetic material receiving grooves 13 in the same row correspond to the positioning convex strips 15 located below the plurality of magnetic material receiving grooves 13 in the same row.

In the present embodiment, the positioning ridge 15 has the communication groove 153, and the communication groove 153 communicates with the plurality of relief grooves 14 in the same row. Because the positioning protrusions 15 protrude from the second surface 12, in the present embodiment, hollow communicating grooves 153 are formed inside the positioning protrusions 15, as described above, the receding grooves 14 communicated with the magnetic material receiving grooves 13 in the same row correspond to the positioning protrusions 15 located below the magnetic material receiving grooves 13 in the same row, and in the present embodiment, the communicating grooves 153 are communicated with the receding grooves 14, and the communicating grooves 153 also extend from below the magnetic material receiving grooves 13 in the same row and are communicated with the magnetic material receiving grooves 13 in the same row, so that the communicating grooves 153 extend from below the magnetic material receiving grooves 13 in the same row and the receding grooves 14 in the same row and are communicated with the magnetic material receiving grooves 13 and the receding grooves 14 in the same row. The communication groove 153 opens at the bottom wall 133 of the magnetic material accommodation groove 13, and the bottom wall 133 of the magnetic material accommodation groove 13 is located on both sides of the opening of the communication groove 153. In addition, although the positioning ridge 15 of the present embodiment has the top wall 152, that is, the communication groove 153 has a groove bottom wall, the positioning ridge 15 is not limited to this, and may have no top wall, that is, the communication groove 153 has no groove bottom wall.

Referring to fig. 1, fig. 2 and fig. 6 again, the magnetic body supporting device 100 of the present application further includes a limiting member 30, and the limiting member 30 is disposed on the first surface 11 of the supporting member 10. The stopper 30 mainly prevents the magnetic material M located in the magnetic material receiving groove 13 from separating from the magnetic material receiving groove 13. The limiting member 30 of the present embodiment has a plurality of limiting protrusions 31, and when the limiting member 30 is disposed on the first surface 11 of the carrier 10, the plurality of limiting protrusions 31 are disposed on the plurality of magnetic material accommodating grooves 13, respectively. As shown in fig. 2, the limiting member 30 is plate-shaped and has a third surface 32 and a fourth surface 33, the plurality of limiting protrusions 31 protrude from the third surface 32, and the positions of the plurality of limiting protrusions 31 correspond to the positions of the plurality of magnetic material receiving slots 13 of the carrier 10. Therefore, when the limiting member 30 is covered on the supporting member 10, the third surface 32 of the limiting member 30 abuts against the first surface 11 of the supporting member 10, and the limiting protrusion 31 is engaged with the magnetic material accommodating groove 13, as shown in fig. 6, so as to limit the magnetic material M in the direction perpendicular to the first surface 11, and prevent the magnetic material M from coming out of the opening of the magnetic material accommodating groove 13 during the transportation process. In the present embodiment, the limiting protrusion 31 and the magnetic material receiving slot 13 are configured, that is, the shape of the limiting protrusion 31 matches the shape of the magnetic material receiving slot 13, and the size of the limiting protrusion 31 is slightly smaller than the size of the magnetic material receiving slot 13, so as to position the limiting member 30 on the carrier 10. As shown in fig. 2 and 6, the magnetic material accommodation groove 13 is rectangular, the limit projection 31 is also rectangular, and the size of the long side and the wide side of the limit projection 31 is slightly smaller than the size of the long side and the wide side of the magnetic material accommodation groove 13. The stopper protrusion 31 may have a proper protrusion height, so that after the stopper protrusion 31 is engaged with the magnetic material accommodation groove 13, the stopper protrusion 31 presses the magnetic material M placed in the magnetic material accommodation groove 13. In addition, in the present embodiment, a hollow groove 34 is formed inside the limit projection 31, and the groove 34 is opened on the fourth surface 33. In the present embodiment, the limiting member 30 is made by a plastic suction method, or may be injection molded, but is not limited thereto.

Please refer to fig. 7 and 8, which are cross-sectional views of the magnetic material carrier of fig. 6 before and after stacking, respectively; the carrier 10 of the present embodiment has a frustum shape, the carrier 10 has a peripheral wall 17, the peripheral wall 17 extends from the first surface 11 of the carrier 10 in the same direction as the protruding direction of the positioning ribs 15, and the peripheral wall 17 has an inclination angle, so that a plurality of magnetic material carriers 100 can be stacked in a mutually nested manner. As shown in fig. 3 and 4, the peripheral wall 17 of the present embodiment has a chamfer 171 at one corner and a fillet 172 at the other three corners, so as to form an asymmetric structure, which can be fool-proof when a plurality of carriers 10 are stacked together. After the plurality of magnetic material carriers 100 are stacked, the top wall 152 of the positioning rib 15 of the upper magnetic material carrier 100 presses against the fourth surface 33 of the stopper 30 of the lower magnetic material carrier 100.

Please refer to fig. 9, which is a cross-sectional view of a magnetic material carrying device according to another embodiment of the present application; as shown in the drawing, the structure of the present embodiment is the same as that of the above embodiment, and the same reference numerals are given to the same components, and the description thereof is omitted. The difference between the present embodiment and the above embodiments is that the limiting member 30 of the present embodiment is disposed on the surface close to the second surface 12 of the carrier 10 and the surface of the magnetic positioning member 20 away from the second surface 12. In the present embodiment, the fourth surface 33 of the limiting member 30 is abutted and attached to the top wall 152 of the positioning protrusion 15. For example, the fourth surface 33 of the limiting member 30 is attached to the top wall 152 of the positioning protrusion 15 by adhesive, so that the protruding direction of the limiting protrusion 31 of the limiting member 30 is the same as the protruding direction of the positioning protrusion 15, and thus the magnetic carrier 100 of the embodiment forms an integral member, thereby improving the convenience of use.

Please refer to fig. 10 and 11, which are cross-sectional views of the magnetic material loading device of fig. 9 before and after stacking, respectively; as shown in the figures, when the carriers 10 of the present embodiment are stacked in a nested manner, the limiting member 30 of the upper magnetic carrier 100 can abut against the carrier 10 of the lower magnetic carrier 100, and the limiting protrusion 31 of the limiting member 30 is engaged with the magnetic material accommodating slot 13 of the carrier 10 to limit the magnetic material M in the magnetic material accommodating slot 13.

To sum up, the present application provides a magnetic substance bearing device, its bearing piece has the magnetic substance storage tank of arranging in rows and is used for holding a plurality of magnetic substances, and the first surface of bearing piece covers the locating part, and the restriction magnetic substance is deviate from and is produced the dislocation from the magnetic substance storage tank. The second surface of the bearing part is provided with a magnetic body positioning piece which positions the magnetic bodies in the magnetic body accommodating groove in a magnetic attraction mode and can prevent the magnetic bodies from mutually attracting or repelling. The structure of the magnetic body bearing device can simplify the clamping structure of the automatic machine and reduce the cost of the automatic machine. In addition, the magnetic body bearing device of this application provides the space of dodging the automatic machine and getting the mechanism through setting up the groove of stepping down, and the magnetic body storage tank that arranges into the array form can fix a position the magnetic body and make the equidistant range of magnetic body moreover, and the automatic machine can press from both sides and get the equipment magnetic body. In addition, because the bearing piece and the limiting piece are manufactured in a plastic suction mode, the manufacturing cost is low, the transportation cost is low, and the mass production is easy.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (18)

1. A magnetic substance bearing device, comprising:

the bearing piece is provided with a first surface and a second surface which are opposite, the bearing piece is provided with a plurality of magnetic body accommodating grooves, the plurality of magnetic body accommodating grooves are positioned on the first surface, and each magnetic body accommodating groove is used for accommodating a magnetic body;

the magnetic body setting element sets up hold carrier the second surface, the magnetic body setting element passes through the magnetism adsorption mode and fixes a plurality of the magnetic body is in a plurality of the magnetic body storage tank.

2. The magnetic body carrying device according to claim 1, further comprising a stopper provided on the first surface of the carrier.

3. The magnetic carrying apparatus of claim 1, further comprising a stopper disposed on a surface of the magnetic positioning member away from the second surface.

4. The magnetic material loading device according to claim 2 or 3, wherein the stopper has a plurality of stopper projections corresponding to the plurality of magnetic material accommodating grooves, respectively.

5. The magnetic material loading device according to claim 4, wherein a plurality of the position-restricting convex portions are respectively provided in the magnetic material accommodating grooves.

6. The magnetic carrying device of claim 4, wherein the limiting protrusion is in form fit with the magnetic body receiving slot.

7. The magnetic material loading device according to claim 1, wherein the carrier further has a plurality of positioning ribs, the plurality of positioning ribs are disposed on the second surface of the carrier, the magnetic material positioning member is provided with a plurality of positioning holes, and the plurality of positioning ribs are disposed in the plurality of positioning holes.

8. The magnetic carrying device of claim 7, wherein the contour of the edge of each of the magnetic material receiving slots matches the contour of the edge of the magnetic material.

9. The magnetic carrying apparatus of claim 8, wherein a plurality of the magnetic material receiving slots are arranged in a matrix on the first surface and in a plurality of rows; the plurality of positioning convex strips correspond to the plurality of magnetic body accommodating grooves in each row respectively, and each positioning convex strip passes through the lower part of the plurality of magnetic body accommodating grooves in the corresponding row.

10. The magnetic substance loading device according to claim 7, wherein the extending direction of each positioning protrusion is parallel to the arrangement direction of each magnetic substance receiving groove of the corresponding row.

11. The magnetic material loading device according to claim 8, wherein the loading member further comprises a plurality of relief grooves, the relief grooves are respectively disposed at edges of the plurality of magnetic material accommodating grooves and respectively communicate with the corresponding magnetic material accommodating grooves.

12. The magnetic material loading device according to claim 11, wherein the relief grooves communicating with the magnetic material receiving grooves in the same row correspond to the positioning ribs below the magnetic material receiving grooves in the same row.

13. The magnetic body carrying device according to claim 12, wherein the positioning rib has a communicating groove communicating with the plurality of relief grooves.

14. The magnetic substance loading device according to any one of claims 11 to 13, wherein the relief grooves communicating with the magnetic substance receiving grooves in the same row communicate with each other.

15. The magnetic material carrying apparatus according to claim 1, wherein a contour of an edge of each of the magnetic material receiving grooves matches a contour of an edge of the magnetic material, and the plurality of relief grooves are respectively communicated with the corresponding magnetic material receiving grooves.

16. The magnetic material loading device according to claim 15, wherein the loading member further comprises a plurality of relief grooves, the relief grooves are respectively disposed at edges of the plurality of magnetic material receiving grooves and respectively communicate with the corresponding magnetic material receiving grooves.

17. The magnetic material loading apparatus of claim 16, wherein the plurality of magnetic material receiving slots are arranged in a matrix on the first surface and in a plurality of rows, the plurality of relief slots communicating with the plurality of magnetic material receiving slots in the same row.

18. The magnetic substance loading device according to claim 12 or 16, wherein a width of the relief groove parallel to the arrangement direction of the plurality of magnetic substance receiving grooves in the same row is smaller than a width of the magnetic substance receiving groove parallel to the arrangement direction of the plurality of magnetic substance receiving grooves in the same row.

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