Armature assembly with neodymium iron boron magnetic steel and processing method thereof

Abstract

The invention provides an armature assembly with neodymium iron boron magnetic steel and a processing method thereof, and belongs to the technical field of relays. According to the invention, the middle parts of the armature and the movable contact spring are subjected to integral injection molding and plastic coating, the mounting hole is synchronously formed in the injection molding and plastic coating process, one end of the mounting hole extends to the armature, the surface of the armature is exposed in the mounting hole, the magnetic steel is placed in the mounting hole and is directly connected with the armature in a magnetic attraction manner, and the magnetic steel is made of neodymium iron boron, so that the reliability of the magnetic steel is improved. Compared with the prior art, under the same magnetic steel size, larger suction force can be provided, the use performance is better, the size can be reduced, in addition, after the magnetic steel is installed, the magnetic steel does not need to be accurately and stably fixed to the armature in a spot welding or dispensing mode before injection molding, the technology is simpler, operation is convenient, the machining efficiency is high, and in addition, the production cost is reduced. The magnetic steel installed on the armature in a magnetic attraction mode in the later period is not excessively wrapped by the wrapping plastic, the overall size is further reduced, miniaturization design of the relay is facilitated, and application and popularization of the relay are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of relays, and particularly to an armature assembly with a neodymium iron boron magnet and a processing method thereof. Background Art

[0002] As a commonly used structure in the field of electronic control, a relay can attract or release an armature structure through electromagnetic changes, drive a moving contact to contact or separate relative to a static contact through the armature structure, realize the on-off control of a circuit, and meet the requirements of automatic control and remote control.

[0003] Currently, the existing relays on the market include an electromagnetic base and an armature assembly. A iron core with a coil is arranged in the electromagnetic base. The armature assembly is supported on the electromagnetic base and can swing relative to the electromagnetic base. At the same time, a moving reed is arranged on the armature assembly, and a moving contact is arranged on the moving reed. When the coil in the electromagnetic base is energized to generate a corresponding magnetic field, the armature assembly can be attracted to swing towards one side, thereby driving the moving contact to contact or separate from the static contact to meet the use requirements. In addition, the armature assembly further includes an armature, a magnet, and plastic coating. The armature is a strip-shaped structure, and both ends of the armature can cooperate with the iron core with a coil in the electromagnetic base, so that the armature assembly can swing on the electromagnetic base when the coil in the electromagnetic base is energized. In addition, the magnet is pre-fixed in the middle of the armature by spot welding or gluing, so that the armature assembly can swing smoothly in the magnetic field formed by the electromagnetic base later. And the plastic coating is injection molded outside the part of the armature with the magnet to form an integral structure to realize the wrapping of the magnet and the outside. In addition, in order to ensure the smooth progress of the injection molding process, it is necessary to first stably fix the magnet on the armature and then perform injection molding, that is, it is necessary to accurately define the installation position and connection reliability of the magnet on the armature before the later injection molding can be carried out, which increases the processing technological process, the operation is more cumbersome, and the processing efficiency is lower. And because the magnet is pre-installed on the armature, usually the plastic coating will completely wrap the magnet, resulting in a larger volume of the integral structure formed by injection molding. At the same time, because the existing magnet uses ferrite material and its magnetism is not very good, it is necessary to increase the volume of the magnet to increase the magnetism. Therefore, in order to ensure the suction force, it is also necessary to increase the volume to meet the use requirements. Therefore, the overall volume of the relay is relatively large, which is not conducive to miniaturization design and thus not conducive to the popularization and application of the relay. Summary of the Invention

[0004] In view of the above problems existing in the prior art, the present invention aims to provide an armature assembly with a neodymium iron boron magnet and a processing method thereof. By setting a magnet made of neodymium iron boron, a greater suction force can be provided under the condition of the original magnet volume, which is conducive to reducing the volume of the magnet. At the same time, during processing, the plastic coating can be first injection-molded outside the armature with mounting holes reserved, and after the injection molding is completed, the magnet can be directly adsorbed on the armature through the mounting holes. There is no need to pre-fix the magnet on the armature for injection molding, and the magnet can be directly magnetically adsorbed and installed later, reducing the pre-fixing steps, making the operation more convenient and improving the processing efficiency. In addition, the plastic coating does not need to wrap the magnet all around, which is conducive to reducing the overall volume of the injection molding and realizing the miniaturized design of the relay, facilitating the popularization and application of the relay.

[0005] The specific technical solutions are as follows: An armature assembly with a neodymium iron boron magnet, installed on an electromagnetic base, includes an armature, a magnet, a plastic coating, and a moving reed. It has the following characteristics: the armature is in a strip structure, the middle part of the armature is injection-molded with the plastic coating, and mounting holes are reserved on the plastic coating. The magnet is arranged in the mounting holes, and the magnet is made of neodymium iron boron and is magnetically connected to the armature. At the same time, moving reeds arranged in the same direction are provided on both sides of the armature, and the middle parts of the moving reeds are also injection-molded with the plastic coating. Moving contacts are provided at both ends of each moving reed. When the armature, the moving reeds, and the plastic coating are injection-molded into an integral structure, the mounting holes on the plastic coating are obtained simultaneously.

[0006] In the above-mentioned armature assembly with a neodymium iron boron magnet, a guiding inclined surface is provided at the orifice of the mounting hole.

[0007] In the above-mentioned armature assembly with a neodymium iron boron magnet, a protruding limiting block is provided on the electromagnetic base and on the side close to the armature assembly, and the limiting block is located below the magnet in the vertical direction.

[0008] In the above-mentioned armature assembly with a neodymium iron boron magnet, along the length direction of the armature, avoiding inclined surfaces are provided on both edges at both ends of the side of the limiting block close to the armature assembly.

[0009] In the above-mentioned armature assembly with a neodymium iron boron magnet, connecting parts extend and protrude on both sides of the plastic coating, and the moving reeds on both sides are injection-molded with the corresponding connecting parts. And a sunken deflection hole is opened on each connecting part on the side where the plastic coating is provided with the mounting hole. A supporting part corresponding to the deflection holes on the two connecting parts is provided on the side of the electromagnetic base close to the armature assembly. The limiting block is located between the two supporting parts, and the end of the supporting part is inserted into the corresponding deflection hole.

[0010] In the above-mentioned armature assembly with a neodymium iron boron magnet, an avoiding notch is opened in the middle part of each moving reed and on the side close to the armature, and one avoiding notch corresponds to the deflection hole of one connecting part.

[0011] The above armature assembly with a neodymium iron boron magnet, wherein contact surfaces are provided at both ends of the armature, and the contact surfaces are arranged protruding or recessed from the surface of the middle part of the armature.

[0012] The above armature assembly with a neodymium iron boron magnet, wherein a recessed or protruding avoidance surface is provided on the contact surface at one end of the armature.

[0013] The above armature assembly with a neodymium iron boron magnet, wherein a notch is provided on the contact surface at one end of the armature.

[0014] A processing method for an armature assembly with a neodymium iron boron magnet, used for processing the above armature assembly with a neodymium iron boron magnet, including the following steps: Step S1, component manufacturing; First, the armature and the moving reed are obtained by stamping, and at the same time, the magnet is manufactured for later use; Step S2, injection molding; The armature and the moving reed are placed in an injection mold and limited and fixed, and the plastic coating material is filled into the injection mold to form a plastic coating in the middle of the armature and the moving reed. And, mounting holes are formed synchronously on the plastic coating, and one end of the mounting hole extends to the armature and exposes the corresponding surface of the armature in the mounting hole; Step S3, magnet installation; The magnet is placed in the mounting hole, and one side surface of the magnet is magnetically attracted and attached to the surface of the armature exposed in the mounting hole.

[0015] The positive effects of the above technical solutions are: For the above armature assembly with a neodymium iron boron magnet and its processing method, by first injection molding and plastic coating the middle parts of the armature and the moving reed to form an integral structure, and directly forming mounting holes on the plastic coating during the injection molding and plastic coating process, and one end of the mounting hole extends to the armature and exposes the armature in the mounting hole. In addition, a magnet made of neodymium iron boron material can provide greater suction force under the same magnet volume, which is beneficial to the reduction of volume. And, the magnet is directly placed in the mounting hole and magnetically connected to the armature, realizing the processing process of installing the magnet after injection molding. There is no need to accurately and stably fix the magnet on the armature by spot welding or gluing before injection molding. The operation process is simpler, the processing is more convenient, and the processing efficiency is higher. In addition, the magnet installed and magnetically connected later does not need to be overly coated with plastic coating, which is also beneficial to the reduction of the overall volume, providing conditions for the miniaturization design of the relay and facilitating the popularization and application of the relay. Brief Description of the Drawings

[0016] Figure 1 It is a structural diagram of an embodiment of an armature assembly with a neodymium iron boron magnet of the present invention; Figure 2Structural diagram of an armature assembly with a NdFeB magnet when the magnet is not installed, according to the present invention; Figure 3 Structural diagram of an armature assembly with a NdFeB magnet after hidden plastic coating, according to the present invention; Figure 4 Flow chart of a processing method of an armature assembly with a NdFeB magnet, according to the present invention.

[0017] In the attached drawings: 1. Armature; 11. Contact surface; 111. Avoidance surface; 2. Magnet; 3. Plastic coating; 31. Mounting hole; 32. Connecting part; 311. Guide inclined surface; 321. Deflection hole; 4. Moving reed; 41. Moving contact; 42. Avoidance notch. Detailed implementation manners

[0018] In order to make the technical means, creative features, achieved purposes and functions realized by the present invention easy to understand, the following embodiments are combined with the attached Figure 1 to the attached Figure 4 to specifically elaborate on the technical solutions provided by the present invention, but the following content is not a limitation of the present invention.

[0019] Figure 1 Structural diagram of an embodiment of an armature assembly with a NdFeB magnet, according to the present invention; Figure 2 Structural diagram of an armature assembly with a NdFeB magnet when the magnet is not installed, according to the present invention. As Figure 1 and Figure 2 shown, the armature assembly with a NdFeB magnet provided in this embodiment is installed on an electromagnetic base, and the armature assembly can deflect on the electromagnetic base, so that the moving contact 41 on the armature assembly can contact or separate from the static contact on the electromagnetic base to meet the circuit control requirements. At this time, the armature assembly with a NdFeB magnet 2 provided in this embodiment includes: an armature 1, a magnet 2, a plastic coating 3, and a moving reed 4.

[0020] Specifically, the armature 1 is in a strip structure, having a certain length to meet the requirements of its cooperation with the electromagnetic base. At the same time, a plastic coating 3 is injection-molded in the middle of the armature 1, and during the injection molding process of the plastic coating 3, an installation hole 31 is reserved on the plastic coating 3 synchronously, providing conditions for the subsequent installation of the magnet 2, that is, realizing the injection molding of the plastic coating 3 first and then the installation of the magnet 2. Compared with the traditional method of first accurately and stably fixing the magnet 2 to the armature 1 by spot welding or gluing and then performing the overall injection molding of the plastic coating 3, the operation is more convenient and the process is simpler, thus improving the processing efficiency. During assembly, the magnet 2 is arranged in the installation hole 31, that is, the installation hole 31 provides conditions for the embedded installation of the magnet 2. And the magnet 2 is made of neodymium iron boron material. At this time, the magnet 2 is magnetically connected to the armature 1, realizing the rapid assembly of the magnet 2. Compared with the traditional assembly methods of spot welding and gluing, the operation steps are also simplified, the processing efficiency is improved, and the manufacturing cost is reduced. In addition, compared with the traditional ferrite magnet 2, the neodymium iron boron magnet 2 can provide greater suction force under the same volume of the magnet 2, the use effect of the relay is better, and it is also beneficial to the reduction of the volume of the magnet 2. And the magnet 2 is assembled after the injection molding of the plastic coating 3, so that the plastic coating 3 will not overly cover the magnet 2, which is also beneficial to the reduction of the overall volume, thus facilitating the miniaturization design of the relay and promoting the popularization and application of the relay. At the same time, moving contact springs 4 arranged in the same direction are provided on both sides of the armature 1. The middle part of the moving contact spring 4 is also injection-molded with the plastic coating 3, that is, during injection molding, the armature 1 and the moving contact spring 4 are injection-molded into one body through the plastic coating 3, with better integrity and higher movement synchronization. In addition, moving contacts 41 are provided at both ends of each moving contact spring 4, so that when the armature 1 swings, the moving contacts 41 can move synchronously to realize the contact or separation from the static contacts. And when the armature 1, the moving contact spring 4 and the plastic coating 3 are first injection-molded into an integral structure, the installation hole 31 on the plastic coating 3 is obtained simultaneously during injection molding, so that the synchronous processing of the installation hole 31 is completed during the injection molding of the plastic coating 3, and there is no need to additionally process the installation hole 31 subsequently, which is more convenient and has higher efficiency.

[0021] More specifically, a guiding inclined surface 311 is provided at the orifice of the installation hole 31, forming a flared opening at the orifice of the installation hole 31 through the guiding inclined surface 311, so that when the magnet 2 is subsequently installed in the installation hole 31, it can be quickly guided and positioned through the guiding inclined surface 311, ensuring that the magnet 2 can be accurately and quickly installed in the installation hole 31, improving the assembly efficiency.

[0022] More specifically, a protruding limiting block is provided at the middle position on one side of the electromagnetic base and close to the armature assembly. Moreover, the limiting block is located below the magnet 2 in the vertical direction. That is, when the armature assembly is installed on the electromagnetic base, the limiting block can limit the magnet 2 from the bottom, ensuring that the magnet 2 can always fit on the armature 1 and will not fall out of the mounting hole 31, maintaining the structural stability of the armature assembly and ensuring the use effect.

[0023] More specifically, along the length direction of the armature 1, chamfered surfaces for avoidance are provided at both edges at the two ends on the side of the limiting block close to the armature assembly. By the chamfered surfaces for avoidance, the edges at both ends of the limiting block are reduced and lowered, enabling it to adapt to the deflection angle of the armature 1 when the armature 1 deflects. That is, while satisfying the auxiliary support for the magnet 2, it can also adapt to the deflection of the armature 1, avoiding interference with the movement of the armature assembly, and the structural design is more reasonable.

[0024] More specifically, connecting portions 32 extend and protrude on both sides of the plastic coating 3, and the connecting portions 32 and the plastic coating 3 are of an integral structure. At this time, the moving spring pieces 4 on both sides are injection-molded with the corresponding connecting portions 32, that is, the moving spring pieces 4 are connected to the armature 1 through the connecting portions 32. In addition, a recessed deflection hole 321 is opened on each connecting portion 32 and on the side where the plastic coating 3 is provided with the mounting hole 31. The deflection hole 321 provides conditions for the subsequent cooperation between the connecting portion 32 and the electromagnetic base. In addition, a supporting portion corresponding to the deflection holes 321 on the two connecting portions 32 is provided on the side of the electromagnetic base close to the armature assembly. Moreover, the limiting block for assisting in supporting the magnet 2 is located between the two supporting portions, enabling the two supporting portions for supporting the armature assembly to be on both sides of the magnet 2, with more uniform force and better stability. And the end of the supporting portion is inserted into the corresponding deflection hole 321. Through the cooperation between the supporting portion and the deflection hole 321 of the connecting portion 32, the installation of the armature assembly on the electromagnetic base is realized, and at the same time, the deflection hole 321 can deflect relative to the end of the supporting portion, meeting the use requirement of the armature assembly deflecting relative to the electromagnetic base.

[0025] Figure 3 This is a structural diagram of an armature assembly with a neodymium iron boron magnet 2 after the plastic coating is hidden according to the present invention. As Figure 2 and Figure 3 shown, an avoidance notch 42 is also opened in the middle of each moving spring piece 4 and on the side close to the armature 1. At the same time, each avoidance notch 42 corresponds to the deflection hole 321 of the corresponding connecting portion 32, that is, the deflection hole 321 on the connecting portion 32 can be located at the avoidance notch 42 of the moving spring piece 4, enabling the arrangement of the deflection hole 321 to be not affected by the moving spring piece 4. That is, the arrangement of the deflection hole 321 can be satisfied without increasing the thickness of the connecting portion 32, and at the same time, the injection molding of the moving spring piece 4 can also be taken into account, further facilitating the miniaturization of the relay.

[0026] More specifically, contact surfaces 11 are provided at both ends of the armature 1, and the contact surfaces 11 are used in conjunction with the yoke in the electromagnetic base. At this time, the contact surface 11 is protruded or recessed on the surface of the middle part of the armature 1, and the distance between the contact surface 11 and the yoke is adjusted by the protruding or recessed arrangement of the contact surface 11, that is, the adjustment of the relay action stroke is achieved, which meets different usage requirements and has a more reasonable structural design.

[0027] More specifically, the contact surface 11 at one end of the armature 1 is provided with a recessed or protruding avoidance surface 111. At this time, the avoidance surface 111 is located on both sides of the contact surface 11, and the height of the avoidance surface 111 is lower than or higher than the contact surface 11, that is, the contact area between the contact surface 11 and the yoke is changed by the avoidance surface 111, thereby changing the suction force to meet different usage requirements.

[0028] In addition, in addition to the above-mentioned situation of changing the size of the contact surface 11 by setting a recessed or protruding avoidance surface 111, a cutout can also be set on the contact surface 11 at one end of the armature 1, that is, a part of the contact surface 11 of the armature 1 is cut off, which also changes the contact area between the contact surface 11 of the armature 1 and the yoke iron, and can also achieve a change in the suction force, thereby improving adaptability.

[0029] In addition, this embodiment also provides a method for processing an armature assembly with NdFeB magnets, which is used to process the armature assembly with NdFeB magnets 2. Figure 4 FIG. 1 is a flow chart of a method for processing an armature assembly with NdFeB magnets according to the present invention. Figure 4 As shown, the processing method of the armature assembly with NdFeB magnet specifically includes the following steps: Step S1, parts production; First, the armature 1, the movable spring 4 and other structures are obtained by stamping through stamping equipment such as a stamping machine, and the magnetic steel 2 is obtained by sintering and other processes. The manufactured armature 1, the movable spring 4, the magnetic steel 2 and other structural products are collected and set aside.

[0030] Step S2, injection molding; Place the armature 1 and the moving reed 4 in the injection mold and position and fix them to achieve the pre-fixation of each structure such as the armature 1 and the moving reed 4 in the injection mold before injection molding. Then, fill the plastic coating material into the injection mold to form the plastic coating 3 in the middle of the armature 1 and the moving reed 4. At this time, it should be noted that a structural member for forming the mounting hole 31 is preset in the injection mold. When the plastic coating 3 is injection molded, the mounting hole 31 can be formed synchronously on the plastic coating 3, avoiding the problem of additionally machining the mounting hole 31 later, simplifying the processing technology, and improving the processing efficiency. Moreover, one end of the mounting hole 31 extends to the armature 1 and exposes the corresponding surface of the armature 1 into the mounting hole 31, ensuring that when the permanent magnet 2 is subsequently installed in the mounting hole 31, the surface of the permanent magnet 2 can better fit the surface of the armature 1, which can not only ensure the use performance but also improve the stability of the permanent magnet 2 installed on the armature 1, and the structural reliability is better.

[0031] Step S3, install the permanent magnet 2; Place the permanent magnet 2 in the mounting hole 31, and one side surface of the permanent magnet 2 is magnetically attracted and attached to the surface of the armature 1 exposed in the mounting hole 31. That is, after the plastic coating 3 is injection molded on the armature 1, the permanent magnet 2 is installed in the mounting hole 31 on the plastic coating 3, reducing the cumbersome work problem caused by the need for pre-fixation when installing the permanent magnet 2 before injection molding, improving the processing efficiency, and reducing the manufacturing cost.

[0032] The armature assembly with a neodymium iron boron permanent magnet and its processing method provided in this embodiment integrally form the plastic coating 3 by external injection molding in the middle of the armature 1 and the moving reed 4, and the mounting hole 31 is formed synchronously during the injection molding process of the plastic coating 3. One end of the mounting hole 31 extends to the armature 1 and exposes the surface of the armature 1 into the mounting hole 31. Then, the permanent magnet 2 is placed in the mounting hole 31 and directly magnetically connected to the armature 1. Moreover, the permanent magnet 2 is made of neodymium iron boron material, which can provide greater suction force under the same volume of the permanent magnet, has better use performance, and is conducive to the reduction of volume. In addition, after the permanent magnet 2 and the armature 1 are installed on the plastic coating 3, there is no need to accurately and stably fix the permanent magnet 2 to the armature 1 by spot welding or dispensing before injection molding. The process is simpler, the operation is more convenient, and the processing efficiency is higher. In addition, the permanent magnet 2 magnetically installed on the armature 1 later will not be overly covered by the plastic coating 3, further avoiding the increase of the overall volume, facilitating the miniaturization design of the relay, and being conducive to the popularization and use of the relay.

[0033] The above are only preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention accordingly. For those skilled in the art, it should be able to realize that all equivalent replacements and obvious changes made by using the description and illustration content of the present invention should be included in the protection scope of the present invention.

Claims

1. An armature assembly with NdFeB magnet, mounted on an electromagnetic base, comprising an armature, a magnet, a plastic coating and a moving spring, characterized in that: The armature is a strip-shaped structure, the middle part of the armature is injection molded with the overmolding, a mounting hole is reserved on the overmolding, the magnetic steel is arranged in the mounting hole, and the magnetic steel is made of neodymium iron boron, the magnetic steel is magnetically connected to the armature, and at the same time, the movable spring pieces arranged in the same direction are arranged on both sides of the armature, the middle part of the movable spring pieces is also injection molded with the overmolding, and moving contacts are arranged at both ends of each movable spring piece, and when the armature, the movable spring piece and the overmolding are first injection molded into an integral structure, the mounting holes on the overmolding are injection molded at the same time.

2. The armature assembly with NdFeB magnet according to claim 1, characterized in that: The opening of the mounting hole is provided with a guiding inclined surface.

3. The armature assembly with NdFeB magnet according to claim 1, characterized in that: A protruding limit block is arranged on the electromagnetic base and on a side close to the armature assembly, and the limit block is located below the magnetic steel in the vertical direction.

4. The armature assembly with NdFeB magnet according to claim 3, characterized in that: Along the length direction of the armature, two edges at both ends of the limit block on one side close to the armature assembly are provided with avoidance slopes.

5. The armature assembly with NdFeB magnet according to claim 3, characterized in that: Connecting parts are arranged on both sides of the overmolding, the movable spring sheets on both sides are injection molded with the connecting parts on the corresponding sides, and a recessed deflection hole is provided on each of the connecting parts and on the side of the overmolding where the mounting hole is provided, and a supporting part corresponding to the deflection holes on the two connecting parts is provided on one side of the electromagnetic base close to the armature assembly, the limit block is located between the two supporting parts, and the end of the supporting part is inserted into the corresponding deflection hole.

6. The armature assembly with NdFeB magnet according to claim 5, characterized in that: A relief notch is provided in the middle of each movable spring piece and on one side close to the armature, and one relief notch corresponds to the deflection hole of the connecting portion.

7. The armature assembly with NdFeB magnet according to claim 1, characterized in that: Both ends of the armature are provided with contact surfaces, and the contact surfaces are protruding or recessed from the surface of the middle part of the armature.

8. The armature assembly with NdFeB magnet according to claim 7, characterized in that: The contact surface at one end of the armature is provided with a recessed or protruding avoidance surface.

9. The armature assembly with NdFeB magnet according to claim 7, characterized in that: The contact surface at one end of the armature is provided with a cutout.

10. A method for processing an armature assembly with NdFeB magnets, characterized in that: The method for processing an armature assembly with NdFeB magnet according to any one of claims 1 to 9 comprises the following steps: Step S1, parts production; First, the armature and the movable spring are obtained by stamping, and the magnetic steel is obtained at the same time, and is ready for use; Step S2, injection molding; The armature and the movable spring are placed in an injection mold and fixed in position, and the overmolding material is filled into the injection mold to form the overmolding in the middle of the armature and the movable spring, and the mounting hole is simultaneously formed on the overmolding, one end of the mounting hole extends to the armature and the surface of the corresponding part of the armature is exposed in the mounting hole; Step S3, magnetic steel installation; The magnetic steel is placed in the mounting hole, and a side surface of the magnetic steel is magnetically attached to a surface of the armature exposed in the mounting hole.

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