Linear motor stator tooling and splicing method

Abstract

The present invention relates to the technical field of mechanical equipment, and discloses a linear motor stator fixture and a splicing method. The installation surface, the first positioning surface, and the second positioning surface of the linear motor stator fixture form an installation space for splicing the stator. The first positioning surface and the second positioning surface are perpendicular to the installation surface, and the second positioning surface is perpendicular to the first positioning surface. Thus, the first positioning surface can be used as a splicing reference for the end of the magnet, and the second positioning surface can be used as a splicing reference for the side of the magnet. The second positioning member is made of a material with magnetic attraction, and the magnet can be adsorbed and abutted against the second positioning surface. The magnets can be alternately placed and tightly attracted to each other through spacers. Therefore, it can be used for the assembly of magnets of various sizes, has strong adaptability, can improve the consistency of stator splicing, thereby improving the positioning accuracy and running stability of the linear motor, and can effectively improve the yield rate and production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical equipment, and in particular to a linear motor stator tooling and a splicing method. Background Art

[0002] A linear motor is a motion device that converts electrical energy directly into mechanical energy. Compared with traditional servo motors with screws or synchronous belts, a linear motor uses a direct drive work platform, eliminating the various connecting components in the middle. It has the advantages of low noise, high positioning accuracy, fast response and operation speed, long installation stroke, and long service life. It is widely used in various mechanical equipment, such as laser cutting, measurement / inspection, printing, LED packaging and testing equipment. The quality of the linear motor stator is the key to achieving high-precision positioning and smooth trajectory operation of the linear motor. In related technologies, manual operation is usually used to fix the magnets on the stator base plate, which has low production efficiency and high labor costs. In addition, the quality of the stator is greatly affected by human factors, and the yield rate is low. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a linear motor stator tooling and a splicing method for splicing linear motor stators, which can effectively improve the splicing quality and efficiency.

[0004] According to the first aspect of the present invention, a linear motor stator fixture includes:

[0005] The base is provided with a mounting surface, and the mounting surface is used for fixing and connecting the yoke plate;

[0006] a first positioning member connected to the base and comprising a first positioning surface perpendicular to the mounting surface;

[0007] A second positioning member is connected to the base, and the second positioning member is made of a material with magnetic attraction ability, including a second positioning surface perpendicular to the mounting surface, and the second positioning surface is perpendicular to the first positioning surface. The mounting surface, the first positioning surface and the second positioning surface form an installation space for splicing the stator.

[0008] The linear motor stator fixture according to the embodiment of the present invention has at least the following beneficial effects: the first positioning surface and the second positioning surface are perpendicular to the mounting surface, and the second positioning surface is perpendicular to the first positioning surface. Thus, the first positioning surface can be used as a splicing reference for the end of the magnet, and the second positioning surface can be used as a splicing reference for the side of the magnet. The second positioning member is made of a material with magnetic attraction, and the magnet can be adsorbed and abutted against the second positioning surface. The magnets can be alternately placed and tightly attracted to each other through spacers. Therefore, it can be used for the assembly of magnets of various sizes, has strong adaptability, can improve the consistency of stator splicing, thereby improving the positioning accuracy and running stability of the linear motor, and can effectively improve the yield rate and production efficiency.

[0009] According to some embodiments of the present invention, a first accommodating groove communicating with the installation space is provided between the first positioning member and the base, and the first accommodating groove is used to accommodate one side of the yoke plate.

[0010] According to some embodiments of the present invention, the first positioning member includes a first connecting portion and a first supporting portion, the first connecting portion is connected to the base, the first supporting portion is located above the mounting surface, the first positioning surface is provided on the side of the first supporting portion facing the mounting space, and the first accommodating groove is formed between the first connecting portion, the first supporting portion and the base.

[0011] According to some embodiments of the present invention, a plurality of fixing holes for fixing the yoke plate are provided on the base at positions corresponding to the first accommodating grooves, and a through hole is provided on the first supporting portion at positions corresponding to the fixing holes.

[0012] According to some embodiments of the present invention, surfaces of the first connecting portion and the first supporting portion facing the first receiving groove are planes perpendicular to each other.

[0013] According to some embodiments of the present invention, a second accommodating groove connected to the installation space is provided between the second positioning member and the base, and the second accommodating groove is used to accommodate a side edge of the yoke plate corresponding to the second positioning member.

[0014] According to some embodiments of the present invention, the second positioning member includes a second connecting portion and a second supporting portion, the second connecting portion is connected to the base, the second supporting portion is located above the mounting surface, and the second positioning surface is provided on the side of the second supporting portion facing the mounting space, and the second accommodating groove is formed between the second connecting portion, the second supporting portion and the base.

[0015] According to some embodiments of the present invention, the base is in the shape of a rectangular plate, having a first edge and a second edge perpendicular to each other, the first positioning member is connected to the first edge, and the second positioning member is connected to the second edge.

[0016] According to the linear motor stator splicing method of the second embodiment of the present invention, the linear motor stator tooling of the first embodiment is used, the yoke plate is placed on the mounting surface and fixedly connected to the base, the magnets are spliced ​​in the mounting space in a manner spaced in sequence by magnet spacers, the ends of each magnet are against the first positioning surface, the first magnet on the side of the mounting space facing the second positioning member is adsorbed on the second positioning member and fits into the second positioning surface; each magnet is fixedly connected to the yoke plate, and then the spacer is removed and the yoke plate connected with the magnet is removed from the tooling.

[0017] According to some embodiments of the present invention, the method of splicing magnets in the installation space in a manner in which magnets and spacers are sequentially spaced includes: adsorbing one side of a first magnet on the second positioning surface, and making the end of the first magnet abut against the first positioning surface; then placing the second magnet along the extension direction of the first positioning surface, and separating the first magnet and the second magnet by a spacer, so that the end of the second magnet is in contact with the first positioning surface, and the side facing the first magnet is attached to the spacer by magnetic attraction; and the remaining magnets are spliced ​​in sequence through this method.

[0018] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0020] Figure 1 This is a schematic structural diagram of a linear motor stator fixture according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of an exploded structure of a linear motor stator fixture according to an embodiment of the present invention;

[0022] Figure 3 for Figure 1 A top view of the linear motor stator fixture of the illustrated embodiment;

[0023] Figure 4 for Figure 3 Right view;

[0024] Figure 5 Schematic diagram of stator splicing of a linear motor using the stator splicing method according to an embodiment of the present invention.

[0025] Reference numerals:

[0026] Base 100, mounting surface 110, fixing hole 120, first edge 130, second edge 140; first positioning member 200, first positioning surface 210, first connecting portion 220, first mounting hole 221, first supporting portion 230, through hole 231; second positioning member 300, second positioning surface 310, second connecting portion 320, second mounting hole 321, second supporting portion 330; first accommodating groove 400; second accommodating groove 500; magnet 600; spacer bar 700. DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0028] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, 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 the present invention 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 cannot be understood as limitations on the present invention.

[0029] If there is a description of first, second, etc., it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] In the description of the present invention, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0032] In a linear motor system, the stator serves as both the motor's excitation source and the track on which the motor runs. Therefore, achieving high-precision positioning and smooth trajectory operation for a linear motor requires a high-quality stator that matches the mover. Magnets are typically secured to the stator baseplate manually, resulting in low production efficiency and high labor costs. Stator quality is also significantly affected by human factors, leading to low yield rates. Some solutions utilize tooling to assist in stator assembly, but these solutions are all based on a stator with a single pole pitch specification. Stators with different pole pitch specifications require different tooling, and the tooling places high demands on the magnets. This can easily lead to assembly errors due to machining and assembly errors, or the resulting stators can be highly unequal, impacting the linear motor's positioning accuracy and smooth operation. Furthermore, the tooling design is relatively complex due to limitations in the machining precision of the strong magnets and the characteristics of the magnets themselves. The linear motor stator tooling provided by the present invention uses two mutually perpendicular positioning surfaces as the splicing reference for the stator magnets, which can effectively ensure the splicing quality and is suitable for splicing straight-slot stators of arbitrary pole pitches of various specifications, eliminating the time for frequent tooling replacement and helping to improve production efficiency.

[0033] Figure 1 Schematic diagram of the structure of the linear motor stator fixture according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the decomposed structure of the linear motor stator fixture according to an embodiment of the present invention, with reference to Figure 1 and Figure 2 The linear motor stator tooling of the embodiment of the present invention is used to assist in the assembly and production of the linear motor stator, and includes a base 100 and a first positioning member 200 and a second positioning member 300 respectively connected to the base 100. The base 100 is provided with a mounting surface 110, which is used to fix and connect the yoke plate. The first positioning member 200 includes a first positioning surface 210 perpendicular to the mounting surface 110, and the second positioning member 300 includes a second positioning surface 310 perpendicular to the mounting surface 110, and the second positioning surface 310 is perpendicular to the first positioning surface 210. Thus, the mounting surface 110, the first positioning surface 210, and the second positioning surface 310 are surrounded by an installation space for splicing the stator. The first positioning surface 210 serves as a splicing reference for the end of the magnet, and the second positioning surface 310 serves as a splicing reference for the side of the magnet. The second positioning member 300 is made of a material with magnetic attraction. Therefore, the magnet adjacent to the second positioning member 300 can be adsorbed on the second positioning member 300, and the side of the magnet is abutted against the second positioning surface 310. The magnets can be alternately placed in sequence through spacers and tightly attracted together. It can be used for assembling magnets of various sizes and has strong adaptability. Compared with the solution of manually positioning and splicing the stator, it can improve the consistency of the stator splicing, thereby improving the positioning accuracy and running stability of the linear motor, and can effectively improve the yield rate and production efficiency.

[0034] Compared with the solution of using a positioning frame to space and position each magnet in the existing tooling, the linear motor stator tooling of the embodiment of the present invention forms an open installation space between the first positioning surface 210, the second positioning surface 310 and the installation surface 110, and uses the first positioning surface 210 and the second positioning surface 310 perpendicular to each other to form an installation reference. The magnet at the head end is adsorbed and positioned by the second positioning member 300 with magnetic attraction ability, and the magnets are separated by spacers, which can effectively avoid the phenomenon that the existing tooling cannot be assembled due to magnet processing errors, and there is no restriction on the length and width of the magnets. It is suitable for splicing straight slot stators of arbitrary pole pitch of various specifications, saves the time of frequent tooling replacement, and helps to improve production efficiency.

[0035] In the above embodiment, the base 100 and the first positioning member 200 can be made of non-magnetic materials, such as aluminum, aluminum alloy, etc. The second positioning member 300 can be made of magnetic materials such as steel and iron.

[0036] Figure 3 for Figure 1 A top view of the linear motor stator fixture of the embodiment shown, Figure 4 for Figure 3 Right view, reference Figures 1 to 4 Based on the above embodiments, in some embodiments, a first accommodating groove 400 connected to the installation space is provided between the first positioning member 200 and the base 100. The first accommodating groove 400 is used to accommodate one side edge of the yoke plate so that the yoke plate can be laid on the installation surface 110 of the base 100.

[0037] In the above embodiment, the first positioning member 200 includes a first connecting portion 220 and a first abutting portion 230. The first connecting portion 220 is connected to the base 100. The first abutting portion 230 is located above the mounting surface 110. The first positioning surface 210 is provided on the side of the first abutting portion 230 facing the mounting space. The first receiving groove 400 of the above embodiment is formed between the first connecting portion 220, the first abutting portion 230, and the base 100. As a result, the first abutting portion 230 is suspended above the mounting surface 110. After the yoke plate is fixed to the base 100, the first positioning surface 210 is located above the yoke plate. The first abutting portion 230 extends inward from the edge of the yoke plate corresponding to the first positioning member 200 by a predetermined width (in the front-to-back direction). This facilitates the installation of the yoke plate and allows the head ends of the magnets to be arranged along the length of the first positioning member 200 with the first positioning surface 210 as a reference when splicing the magnets.

[0038] In the above implementation, reference Figure 2, a plurality of fixing holes 120 for fixing the yoke plate are provided on the base 100 at positions corresponding to the first receiving groove 400. The yoke plate is placed on the mounting surface 110 and one side is conveniently located in the first receiving groove 400. The yoke plate can be fixedly connected to the base 100 by fasteners corresponding to the fixing holes 120. Correspondingly, a through hole 231 is provided at the position of the first abutting portion 230 corresponding to the fixing hole 120 to provide space for the installation of the fastener. Of course, the connection between the yoke plate and the base 100 can also be set elsewhere, such as on the side facing the second positioning member 300, or other positions that are convenient for connecting and disassembling the two.

[0039] According to some embodiments of the present invention, the surfaces of the first connecting portion 220 and the first abutting portion 230 facing the first receiving groove 400 are planes perpendicular to each other. Thus, the first connecting portion 220 and the first abutting portion 230 have an L-shaped cross-section, which is convenient for processing and ensures good processing accuracy. The first connecting portion 220 and the second connecting portion 320 can be an integral structure, that is, the first positioning member 200 is an integral structure, or the first connecting portion 220 and the second connecting portion 320 can be a structure of two pieces spliced ​​together. The use of an integral structure of the first positioning member 200 can ensure processing accuracy and assembly accuracy, and can also reduce other unnecessary auxiliary processing parts. In addition, the first receiving groove 400 forms a right-angled U-shaped groove, which can be used to position the edge of the yoke plate placed in the first positioning groove. Improving the processing accuracy of the first positioning member 200 can also improve the positioning accuracy of the yoke plate and the positioning accuracy of the magnets spliced ​​on the yoke plate, thereby further improving the splicing quality of the stator.

[0040] In some embodiments, a second accommodating groove 500 connected to the installation space may be provided between the second positioning member 300 and the base 100 for accommodating a side edge of the yoke plate corresponding to the second positioning member 300 , so as to facilitate laying the yoke plate on the installation surface 110 of the base 100 .

[0041] In the above embodiment, the second positioning member 300 includes a second connecting portion 320 and a second abutting portion 330. The second connecting portion 320 is connected to the base 100. The second abutting portion 330 is located above the mounting surface 110. A second positioning surface 310 is provided on the side of the second abutting portion 330 facing the mounting space. A second receiving groove 500 is formed between the second connecting portion 320, the second abutting portion 330, and the base 100. Therefore, the second abutting portion 330 is suspended above the mounting surface 110. After the yoke plate is fixed to the base 100, the second positioning surface 310 is located above the yoke plate. The second abutting portion 330 extends inward by a predetermined length (in the left-right direction) from the edge of the yoke plate corresponding to the second positioning member 300. This facilitates the installation of the yoke plate and allows the side surfaces of the magnets to abut against the second positioning surface 310 when assembling the magnets, allowing them to be arranged one by one along the direction extending from the first positioning surface 210 with the second positioning surface 310 as a reference.

[0042] When installing the yoke plate, first place the two vertical edges into the first receiving groove 400 and the second receiving groove 500, respectively. Then, secure the yoke plate to the base 100 using fasteners. In practice, depending on the actual installation requirements of the yoke plate, only one of the first receiving groove 400 and the second receiving groove 500 may be provided.

[0043] According to some embodiments of the present invention, the base 100 is in the shape of a rectangular plate, having a first edge 130 and a second edge 140 that are perpendicular to each other, the first positioning member 200 is connected to the first edge 130, and the second positioning member 300 is connected to the second edge 140. From a processing perspective, the rectangular plate is easy to process and can better ensure the processing accuracy of the first edge 130 and the second edge 140, thereby ensuring the positional accuracy of the first positioning surface 210 on the first positioning member 200 and the second positioning surface 310 on the second positioning member 300, which is beneficial to improving the consistency of the stator. In a specific implementation, the first connecting portion 220 on the first positioning member 200 can be abutted against the first edge 130 of the base 100, and the first connecting portion 220 is provided with a first mounting hole 221 so that it can be connected to the base 100 via fasteners. Similarly, the second connection portion 320 on the second positioning member 300 can be abutted against the second edge 140 of the base 100. A second mounting hole 321 is provided on the second connection portion 320 so as to be connected to the base 100 via a fastener.

[0044] The linear motor stator fixture of the present invention effectively avoids the problem of existing fixtures failing to assemble due to magnet machining errors. It is suitable for assembling straight-slot stators of various specifications and arbitrary pole pitches, eliminating the need for frequent fixture replacement and improving production efficiency. Furthermore, the stator magnets can be assembled using the first positioning surface 210 and the second positioning surface 310 as the splicing reference, effectively ensuring splicing quality. Furthermore, the components are simple and easy to machine, which helps improve machining accuracy and reduce machining difficulty, thereby ensuring both the stability of the linear motor product and improving production efficiency.

[0045] An embodiment of the present invention also provides a linear motor stator splicing method. Figure 5 Schematic diagram of the stator splicing method of the linear motor according to the embodiment of the present invention, referring to Figure 5 , and combined with the above embodiments and Figures 1 to 4 , using the linear motor stator fixture of the above embodiment, the yoke plate is placed on the mounting surface 110 and fixedly connected to the base 100, and the magnets 600 are spliced ​​in the mounting space in a manner that the magnets 600 and the spacers 700 are spaced in sequence. The ends of each magnet 600 are all against the first positioning surface 210, and the first magnet 600 on the side of the mounting space facing the second positioning member 300 is adsorbed on the second positioning member 300 and fits on the second positioning surface 310; each magnet 600 is fixedly connected to the yoke plate, and then the spacer 700 is removed and the yoke plate connected with the magnets 600 is removed from the fixture. The magnets 600 and the yoke plate can be connected by bonding. This method uses the mutually perpendicular first positioning surface 210 and the second positioning surface 310 as the splicing reference, which effectively ensures the consistency of the stator. In addition, the magnets 600 are connected and positioned in the manner of the second positioning member 300, which is convenient to operate and accurate in positioning.

[0046] In the linear motor stator splicing method of the above embodiment, the second positioning member 300 may be a steel member made of steel. By utilizing the strong magnetic magnet 600's strong attraction to the steel member, the magnet 600 can be firmly fixed.

[0047] In the linear motor stator splicing method of the above embodiment, the method of splicing magnets in the installation space in a manner in which magnets 600 and spacers 700 are sequentially spaced includes: adsorbing one side of the first magnet on the second positioning surface 310, and making the end of the first magnet abut against the first positioning surface 210; then placing the second magnet along the extension direction of the first positioning surface 210, and separating the first magnet and the second magnet by a spacer 700, so that the end of the second magnet is attached to the first positioning surface 210 and the side facing the first magnet is attached to the spacer 700 by magnetic attraction; and sequentially splicing the third magnet, the fourth magnet, and the remaining magnets by this method. Thus, the magnets 600 and 600 are alternately placed and attracted to each other by the spacers 700, which can effectively avoid the phenomenon that the existing fixture cannot be assembled due to magnet processing errors.

[0048] The linear motor stator splicing method using the linear motor stator tooling of the above embodiment is open in terms of the installation space for manufacturing the stator, and has no restrictions on the length and width of the magnet, so it can manufacture straight slot stators of arbitrary pole pitches of various specifications, eliminating the time of frequent fixture replacement and improving production efficiency.

[0049] While the embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to the embodiments described above. Various modifications may be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof may be combined with one another unless there is a conflict.

Claims

1. Linear motor stator fixture, characterized in that: include: The base is provided with a mounting surface, and the mounting surface is used for fixing and connecting the yoke plate; a first positioning member connected to the base and comprising a first positioning surface perpendicular to the mounting surface; A second positioning member is connected to the base, and the second positioning member is made of a material with magnetic attraction ability, including a second positioning surface perpendicular to the mounting surface, and the second positioning surface is perpendicular to the first positioning surface. The mounting surface, the first positioning surface and the second positioning surface form an installation space for splicing the stator; the second positioning member is used to absorb and position the first magnet, and the side surface of the first magnet is abutted against the second positioning surface, and the first positioning surface is used to abut against the end of each magnet of the stator.

2. The linear motor stator fixture according to claim 1, characterized in that: A first accommodating groove connected to the installation space is provided between the first positioning member and the base, and the first accommodating groove is used to accommodate one side of the yoke plate.

3. The linear motor stator fixture according to claim 2, characterized in that: The first positioning member includes a first connecting portion and a first supporting portion, the first connecting portion is connected to the base, the first supporting portion is located above the mounting surface, the first positioning surface is provided on the side of the first supporting portion facing the mounting space, and the first accommodating groove is formed between the first connecting portion, the first supporting portion and the base.

4. The linear motor stator fixture according to claim 3, characterized in that: A plurality of fixing holes for fixing the yoke plate are provided on the base at positions corresponding to the first accommodating grooves, and a through hole is provided at positions of the first supporting portion corresponding to the fixing holes.

5. The linear motor stator fixture according to claim 3, characterized in that: Surfaces of the first connecting portion and the first supporting portion facing the first accommodating groove are planes perpendicular to each other.

6. The linear motor stator fixture according to claim 1, characterized in that: A second accommodating groove communicating with the installation space is provided between the second positioning member and the base, and the second accommodating groove is used to accommodate a side edge of the yoke plate corresponding to the second positioning member.

7. The linear motor stator fixture according to claim 6, characterized in that: The second positioning member includes a second connecting portion and a second supporting portion, the second connecting portion is connected to the base, the second supporting portion is located above the mounting surface, and the second positioning surface is provided on the side of the second supporting portion facing the mounting space, and the second accommodating groove is formed between the second connecting portion, the second supporting portion and the base.

8. The linear motor stator fixture according to any one of claims 1 to 7, characterized in that: The base is in the shape of a rectangular plate and has a first edge and a second edge perpendicular to each other. The first positioning member is connected to the first edge, and the second positioning member is connected to the second edge.

9. A linear motor stator splicing method, characterized in that: A linear motor stator tooling according to any one of claims 1 to 8 is used, the yoke plate is placed on the mounting surface and fixedly connected to the base, the magnets are spliced ​​in the mounting space in a manner spaced in sequence by magnet spacers, the ends of each magnet are against the first positioning surface, the first magnet on the side of the mounting space facing the second positioning piece is adsorbed on the second positioning piece and fits the second positioning surface; each magnet is fixedly connected to the yoke plate, and then the spacers are removed and the yoke plate connected with the magnets is removed from the tooling.

10. The linear motor stator splicing method according to claim 9, characterized in that: The method for splicing magnets in the installation space in a manner in which magnets and spacers are sequentially spaced includes: adsorbing one side of a first magnet on the second positioning surface, and making the end of the first magnet abut against the first positioning surface; then placing the second magnet along the extension direction of the first positioning surface, and separating the first magnet and the second magnet by a spacer, so that the end of the second magnet is in contact with the first positioning surface and the side facing the first magnet is attached to the spacer by magnetic attraction; and the remaining magnets are spliced ​​in sequence through this method.

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