Connection structure and assembly method of dynamic spring and yoke of miniaturized PCB relay

Abstract

The invention discloses a connection structure of a movable spring and a yoke of a miniaturized PCB relay and an assembly method thereof. The connection structure of the movable spring and the yoke includes an armature, a movable spring piece and a yoke; the yoke is provided with a convex bulge; the movable spring piece is provided with a convex bulge matching hole; the convex bulge matching hole includes a gap matching hole and an interference matching hole that are connected; a positioning adjustment structure is also provided between the movable spring piece and the yoke, and through adjustment, the convex bulge matching hole of the movable spring piece is inserted into the convex bulge of the yoke through the clearance matching hole, and after insertion, the convex bulge of the yoke is matched with the interference matching hole. The invention can avoid the influence of the deformation of the movable spring caused by the original riveting process on the relay product, and can also avoid the disadvantage that the convex bulge position of the yoke in the existing method is easy to scrape out copper thorns; moreover, it can also ensure the pressure consistency of the armature at the yoke blade, thereby improving the consistency of the mechanical parameters of the product.

Description

Technical Field

[0001] The invention relates to the technical field of relays, and in particular to a connection structure of a dynamic spring and a yoke iron of a miniaturized PCB relay and an assembly method thereof. Background Art

[0002] PCB relay is a relay used to be installed on a PCB board (i.e., printed circuit board). Due to the limited installation space on the PCB board, the volume of the PCB relay is usually designed to be small. The relay usually includes a movable spring, an armature and a yoke. The relay using a snap-on magnetic circuit structure is to bend the movable spring into an L-shape, one side of the L-shape of the movable spring is fixed to the armature, and the other side of the L-shape of the movable spring is fixed to the yoke. When the movable spring is fixed to the yoke, the armature connected to one side of the L-shape of the movable spring is matched with the blade of the yoke (i.e., the end face of one end of the yoke). When the movable spring is fixed to the yoke in the prior art, a cylindrical convex bulge is provided on the yoke, and a circular through hole is provided at the corresponding matching position of the movable spring. The circular through hole of the movable spring is matched with the cylindrical convex bulge of the yoke, and then the cylindrical bulge of the yoke is riveted and fixed to the circular through hole of the movable spring by riveting. When the miniaturized PCB relay in the prior art adopts this connection structure between the movable spring and the yoke, due to the small size of the miniaturized PCB relay, the riveting process is likely to cause deformation of the movable spring, and the slight gap between the yoke and the movable spring will affect the pressure consistency of the armature at the yoke blade, thereby affecting the consistency of the product's mechanical parameters; in addition, the cylindrical bulge of the yoke and the circular through hole of the movable spring are likely to scrape out copper thorns. Since the copper thorns are made of metal, they will be retained inside the relay and affect the normal operation of the relay. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a connection structure and an assembly method for a miniaturized PCB relay movable spring and a yoke, which can avoid the influence of the deformation of the movable spring caused by the original riveting process on the relay product, and can also avoid the disadvantage that the convex position of the yoke is easily scraped out of copper thorns in the existing method; moreover, it can also ensure the consistency of the pressure of the armature at the yoke edge, thereby improving the consistency of the mechanical parameters of the product.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a connection structure of a miniaturized PCB relay movable spring and a yoke, comprising an armature, a movable spring piece and a yoke; the movable spring piece is bent into an L-shape, a local position of a horizontal side of the L-shape of the movable spring piece is fixed to the armature, a local position of a vertical side of the L-shape of the movable spring piece is fixed to the yoke, and one end of the armature fixed by the horizontal side of the L-shape of the movable spring piece is matched at the edge of the yoke; in the yoke, a local position corresponding to the vertical side of the L-shape of the movable spring piece is fixed to the armature; A convex bud is provided at a local position of the L-shaped vertical side of the movable spring piece; a convex bud matching hole for matching the convex bud of the yoke iron is provided; the convex bud matching hole includes a clearance matching hole and an interference matching hole that are connected; a positioning adjustment structure is also provided between the L-shaped vertical side of the movable spring piece and the yoke iron, and through the adjustment of the positioning adjustment structure, the convex bud matching hole of the movable spring piece is installed into the convex bud of the yoke iron through the clearance matching hole, and after installation, the convex bud of the yoke iron is matched with the interference matching hole, thereby ensuring that the armature has a certain pressure fit at the yoke iron edge.

[0005] The convex bulge is cylindrical; after the movable spring piece and the yoke iron are matched with the cylindrical convex bulge through the interference fit hole, the local position of the movable spring piece and the yoke iron are fixed by laser welding.

[0006] A laser welding mark is provided at a local position of the movable spring piece, and the laser welding mark is two indentations. The movable spring piece and the yoke are fixed to each other at a position between the two indentations by laser welding.

[0007] The yoke has two cylindrical bulges, which are arranged at the same horizontal position of the yoke; the movable spring has two corresponding bulge matching holes; and the two indentations are arranged between the two bulge matching holes.

[0008] The distance from the center of the interference fit hole in the convex fitting hole of the movable spring to the yoke cutting edge is equal to or smaller than the distance from the center of the cylindrical convex fitting hole of the yoke to the yoke cutting edge.

[0009] The distance from the lowest point of the convex fitting hole of the movable spring to the yoke cutting edge is equal to or smaller than the distance from the lowest point of the convex fitting hole of the yoke to the yoke cutting edge.

[0010] The convex fitting hole of the movable spring piece is a waist-shaped hole; the waist-shaped hole is vertically arranged; the clearance fitting hole of the convex fitting hole of the movable spring piece is the middle part of the waist-shaped hole, and the interference fitting hole of the convex fitting hole of the movable spring piece is the lower part of the waist-shaped hole.

[0011] The positioning and adjustment structure includes a first positioning hole provided on the yoke and a second positioning hole provided on the movable spring, and the size of the first positioning hole of the yoke is larger than the second positioning hole of the movable spring. When the positioning and adjustment structure is adjusted, an external positioning needle matching the second positioning hole is inserted into the first positioning hole of the yoke and moved. The elastic deformation of the movable spring is utilized to move the movable spring so that the clearance fitting hole of the movable spring is matched with the convex bulge of the yoke. After the external positioning needle is removed, the elastic deformation of the movable spring is utilized to return the movable spring so that the interference fitting hole of the movable spring is matched with the cylindrical convex bulge of the yoke.

[0012] The first positioning hole of the yoke is arranged in the middle of the two cylindrical bulges, and the first positioning hole and the two cylindrical bulges are staggered in the up-down direction; the second positioning hole of the movable spring is arranged in the middle of the two bulge matching holes, and the second positioning hole and the two bulge matching holes are staggered in the up-down direction.

[0013] A method for assembling a dynamic spring and a yoke iron of a miniaturized PCB relay comprises the following steps:

[0014] Fix the local position of the horizontal side of the L-shape of the movable spring piece with the armature;

[0015] Place the vertical side of the L-shaped movable spring against the yoke, and place one end of the armature fixed by the horizontal side of the L-shaped movable spring on the edge of the yoke;

[0016] Insert the circular positioning needle into the circular second positioning hole of the movable spring piece, and extend it to the middle of the waist-shaped first positioning hole of the yoke iron;

[0017] Pull the positioning pin downward to deform the movable spring downward, so that the waist-shaped convex bulge of the movable spring fits into the middle of the hole and the cylindrical convex bulge of the yoke iron with a gap;

[0018] Remove the positioning pin, the moving spring deforms upward, and the waist-shaped convex bulge of the moving spring fits the lower part of the hole with the cylindrical convex bulge of the yoke iron in an interference fit;

[0019] Laser welding is adopted at the position between the two indentations of the moving spring to fix the moving spring and the yoke iron.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. The present invention adopts a method in which a convex bud is provided in the yoke at a local position corresponding to the vertical side of the L-shape of the movable spring; a bud matching hole for matching the bud of the yoke is provided at a local position of the vertical side of the L-shape of the movable spring; the bud matching hole includes a clearance matching hole and an interference matching hole that are connected; a positioning adjustment structure is also provided between the vertical side of the L-shape of the movable spring and the yoke, and through the adjustment of the positioning adjustment structure, the bud matching hole of the movable spring is installed in the bud of the yoke through the clearance matching hole, and after installation, the bud of the yoke is matched with the interference matching hole, thereby ensuring that the armature has a certain pressure fit at the yoke edge. The structure of the present invention adopts a clearance fit between the convex bulge of the moving spring and the cylindrical convex bulge of the yoke during assembly, which can avoid the disadvantage that the convex bulge of the yoke in the existing method is easily scraped out copper thorns. After assembly, the convex bulge of the moving spring and the cylindrical convex bulge of the yoke are interference fit, which can ensure the pressure consistency of the armature at the cutting edge of the yoke, thereby improving the consistency of the mechanical parameters of the product.

[0022] 2. The present invention adopts the method of fixing the movable spring piece and the yoke iron by laser welding after the movable spring piece and the yoke iron are matched with each other through the interference fit hole and the cylindrical convex bulge. The structure of the present invention adopts laser welding to fix and avoid the influence of the movable spring deformation caused by the original riveting process on the relay product.

[0023] 3. The present invention designs the convex bulge of the movable spring to be in a waist-shaped shape. By pulling down the positioning pin, a clearance fit with the cylindrical bulge of the yoke iron can be achieved during assembly. After the positioning pin is removed, an interference fit with the cylindrical bulge of the yoke iron can be achieved, making the assembly process very simple and the waist-shaped structure is also easy to manufacture.

[0024] 4. The present invention adopts a laser welding mark at a local position of the movable spring, and the laser welding mark is two indentations. Setting the laser welding area of ​​the movable spring yoke (between the two indentations) is conducive to identifying whether the welding position is accurate (ensuring the welding effect and welding reliability), and by specifying the flatness of the yoke and the movable spring in the welding area, the two can be more closely fitted and the welding effect is better.

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments; however, the connection structure between the dynamic spring and the yoke of a miniaturized PCB relay and the assembly method thereof of the present invention are not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 1 is a schematic diagram of the three-dimensional structure of an embodiment of the present invention (the movable spring is not installed in the yoke);

[0027] Figure 2 1 is a schematic diagram of the structure of an embodiment of the present invention (the movable spring is not installed in the yoke);

[0028] Figure 3 1. It is a three-dimensional structural schematic diagram of the embodiment of the present invention in use (the movable spring is installed in the yoke);

[0029] Figure 4 is a front view of the use state of an embodiment of the present invention;

[0030] Figure 5 It is a front view of the embodiment of the present invention in use (the movable spring is not installed in the yoke). DETAILED DESCRIPTION

[0031] Example

[0032] See also Figures 1 to 5 As shown, a connection structure between a movable spring and a yoke of a miniaturized PCB relay of the present invention comprises an armature 1, a movable spring piece 2 and a yoke 3; the movable spring piece 2 is bent into an L-shape, a local position of a horizontal side 21 of the L-shape of the movable spring piece 2 is fixed to the armature 1, a local position of a vertical side 22 of the L-shape of the movable spring piece 2 is fixed to the yoke 3, and one end of the armature 1 fixed by the horizontal side 21 of the L-shape of the movable spring piece 2 is matched at a knife edge 31 of the yoke 3, the yoke 3 is also L-shaped, the horizontal side of the yoke 3 is used to be fixed to the iron core of the relay, the vertical side of the yoke 3 is used to fix the movable spring piece 2, and the knife edge 31 of the yoke 3 is arranged at the top of the vertical side of the yoke 3; in the yoke 3, a convex bud 32 is arranged at a local position corresponding to the vertical side 22 of the L-shape of the movable spring piece 2, and the convex bud 32 is cylindrical; A convex bud matching hole 23 for matching the cylindrical convex bud 32 of the yoke 3 is provided at a local position of the L-shaped vertical side 22 of the movable spring 2; the convex bud matching hole 23 includes a clearance matching hole 231 and an interference fitting hole 232 that are connected; a positioning adjustment structure is also provided between the L-shaped vertical side 22 of the movable spring and the yoke 3, and through the adjustment of the positioning adjustment structure, the convex bud matching hole 23 of the movable spring 2 is installed into the cylindrical convex bud 32 of the yoke 3 through the clearance matching hole 231, and after installation, it is matched with the cylindrical convex bud 32 of the yoke 3 through the interference fitting hole 232, so as to ensure that the armature 1 has a certain pressure fit at the yoke cutting edge 31; after the movable spring 2 and the yoke 3 are matched with the cylindrical convex bud 32 through the interference fitting hole 232, they are fixed between the local position of the movable spring 2 and the yoke 3 by laser welding.

[0033] In this embodiment, a laser welding mark is provided at a local position of the movable spring piece 2, and the laser welding mark is two indentations 24. The movable spring piece 2 and the yoke 3 are fixed to each other by laser welding at a position between the two indentations 24.

[0034] In this embodiment, the yoke 3 has two cylindrical bulges 32, which are arranged at the same horizontal position of the yoke 3; the movable spring 2 has two corresponding bulge matching holes 23; and the two indentations 24 are arranged between the two bulge matching holes 23.

[0035] In this embodiment, the distance A from the center of the interference fit hole 232 in the convex fitting hole 23 of the movable spring 2 to the yoke cutting edge 31 is equal to or less than the distance B from the center of the cylindrical convex 32 of the yoke 3 to the yoke cutting edge 31 .

[0036] In this embodiment, the convex bud fitting hole 23 of the movable spring piece 2 is a waist-shaped hole; the waist-shaped hole 23 is vertically arranged; the clearance fitting hole 231 of the convex bud fitting hole 23 of the movable spring piece 2 is the middle part of the waist-shaped hole, and the interference fitting hole 232 of the convex bud fitting hole 23 of the movable spring piece 2 is the lower part of the waist-shaped hole.

[0037] The bulge 32 of this embodiment is a cylindrical bulge, and the bulge matching hole 23 is a waist-shaped hole. Therefore, the center of the cylindrical bulge 32 and the center of the interference fit hole 232 can be determined. However, when the bulge and the bulge matching hole are matching special-shaped structures, it is difficult to determine the center of the bulge and the center of the interference fit hole. At this time, the distance from the lowest point of the bulge matching hole of the movable spring to the yoke edge can be equal to or less than the distance from the lowest point of the bulge of the yoke to the yoke edge. This setting method can ensure that the armature 1 has a certain pressure fit at the yoke edge 31.

[0038] In this embodiment, the positioning and adjustment structure includes a first positioning hole 33 provided on the yoke 3 and a second positioning hole 25 provided on the movable spring 2, and the size of the first positioning hole 33 of the yoke 3 is larger than the second positioning hole 25 of the movable spring 2, wherein the second positioning hole 25 is a round hole, and the first positioning hole 33 is a waist-shaped hole, and its waist-shaped shape is arranged vertically; when the positioning and adjustment structure is adjusted, it is with the help of an external positioning needle (not shown in the figure) matching the second positioning hole 25, which is inserted into the first positioning hole 33 of the yoke 3 and moved, and the elastic deformation of the movable spring 2 is used to move the movable spring 2 so that the clearance fitting hole 231 of the movable spring 2 is matched with the convex bud 32 of the yoke 3. After the external positioning needle is removed, the elastic deformation of the movable spring 2 is used to return the movable spring 2 so that the interference fitting hole 232 of the movable spring 2 is matched with the cylindrical convex bud 32 of the yoke 3.

[0039] In this embodiment, the first positioning hole 33 of the yoke 3 is arranged in the middle corresponding to the two cylindrical bulges 32, and the first positioning hole 33 and the two cylindrical bulges 32 are staggered in the up and down directions; the second positioning hole 25 of the movable spring 2 is arranged in the middle corresponding to the two bulge matching holes 23, and the second positioning hole 25 and the two bulge matching holes 32 are staggered in the up and down directions.

[0040] A method for assembling a dynamic spring and a yoke of a miniaturized PCB relay of the present invention comprises the following steps:

[0041] The local position of the L-shaped horizontal side 21 of the movable spring piece 2 is fixed to the armature 1;

[0042] Place the L-shaped vertical side 22 of the movable spring 2 against the yoke 3, and place one end of the armature 1 fixed by the L-shaped horizontal side 21 of the movable spring on the edge 31 of the yoke 3;

[0043] Insert the circular positioning needle into the circular second positioning hole 25 of the movable spring, and extend it to the middle of the waist-shaped first positioning hole 33 of the yoke 3;

[0044] Pull the positioning pin downward to deform the movable spring 2 downward, so that the waist-shaped convex bulge of the movable spring 2 fits into the middle part 231 of the matching hole 23 and the cylindrical convex bulge 32 of the yoke 3 with a gap;

[0045] After the positioning pin is removed, the movable spring 2 is deformed upward, and the lower part 232 of the waist-shaped convex bulge of the movable spring matches the lower part 232 of the hole 23 with the cylindrical convex bulge 32 of the yoke 3 in an interference fit;

[0046] Laser welding is used between the two indentations 24 of the movable spring 2 to fix the movable spring 2 and the yoke 3 .

[0047] The present invention discloses a connection structure and an assembly method of a miniaturized PCB relay movable spring and a yoke, wherein a cylindrical convex bulge 32 is provided in the yoke 3 at a local position corresponding to the L-shaped vertical side 22 of the movable spring piece 2; a bulge matching hole 23 for matching the cylindrical bulge of the yoke is provided at a local position of the L-shaped vertical side 22 of the movable spring piece; the bulge matching hole 23 includes a gap matching hole 231 and an interference matching hole 232 that are connected to each other; and a cylindrical bulge 32 is provided between the L-shaped vertical side 22 of the movable spring piece and the yoke 3. A positioning adjustment structure is provided, through which the convex fitting hole 23 of the movable spring piece is adjusted to fit the cylindrical convex 32 of the yoke iron through the clearance fitting hole 231, and after being installed, the convex fitting hole 232 is matched with the cylindrical convex 32 of the yoke iron, thereby ensuring that the armature 1 has a certain pressure fit at the yoke iron edge 31; after the movable spring piece 2 and the yoke iron 4 are matched with the cylindrical convex 32 through the interference fitting hole 232, they are fixed between the local position of the movable spring piece 2 and the yoke iron 3 by laser welding. The structure of the present invention adopts laser welding for fixing, which can avoid the influence of deformation of the movable spring caused by the original riveting process on the relay product. During assembly, the convex fitting hole of the movable spring piece and the cylindrical convex fitting of the yoke iron are clearance-fitted, which can avoid the disadvantage that the convex position of the yoke iron is easily scraped out of copper thorns in the existing method. After assembly, the convex fitting hole of the movable spring piece and the cylindrical convex fitting of the yoke iron are interference-fitted, which can ensure the pressure consistency of the armature at the yoke iron blade, thereby improving the consistency of the product mechanical parameters.

[0048] The present invention discloses a connection structure between a movable spring and a yoke of a miniaturized PCB relay and an assembly method thereof. The convex mating hole 23 of the movable spring piece 2 is designed to be in a waist shape. By pulling down a positioning pin, a clearance fit with the cylindrical convex 32 of the yoke 3 can be achieved during assembly. After the positioning pin is removed, an interference fit with the cylindrical convex 32 of the yoke can be achieved. This makes the assembly process very simple and the waist-shaped structure is also easy to manufacture.

[0049] The present invention discloses a connection structure of a miniaturized PCB relay moving spring and a yoke and an assembly method thereof, wherein a laser welding mark is provided at a local position of a moving spring piece 2, and the laser welding mark is two indentations 24. Setting a moving spring and yoke laser welding area (between the two indentations) is helpful for identifying whether the welding position is accurate (ensuring welding effect and welding reliability), and by specifying the flatness of the yoke and the moving spring in the welding area, the two can be more closely fitted and the welding effect can be better.

[0050] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above, or modify it into an equivalent equivalent embodiment without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A connection structure between a movable spring and a yoke of a miniaturized PCB relay, comprising an armature, a movable spring and a yoke; the movable spring is bent into an L-shape, a local position of a horizontal side of the L-shape of the movable spring is fixed to the armature, a local position of a vertical side of the L-shape of the movable spring is fixed to the yoke, and one end of the armature fixed by the horizontal side of the L-shape of the movable spring is matched at the edge of the yoke; a convex bud is provided in the yoke at a local position corresponding to the vertical side of the L-shape of the movable spring; a convex bud matching hole for matching the convex bud of the yoke is provided at a local position of the vertical side of the L-shape of the movable spring; the characteristic is that: The convex bud matching hole includes a clearance matching hole and an interference matching hole that are connected; the movable spring has elastic deformation, and a positioning adjustment structure is also provided between the L-shaped vertical side of the movable spring and the yoke. Through the cooperation of the positioning adjustment structure and the restoring force of the elastic deformation of the movable spring, the convex bud matching hole of the movable spring is installed into the convex bud of the yoke through the clearance matching hole, and after installation, the convex bud of the yoke is interference-fitted with the interference matching hole, thereby ensuring that the armature has a certain pressure fit at the yoke edge; the positioning adjustment structure includes a first positioning hole provided on the yoke and a second positioning hole provided on the movable spring piece, and the size of the first positioning hole of the yoke is larger than the second positioning hole of the movable spring piece. When adjusting the positioning adjustment structure, an external positioning needle matching the second positioning hole is inserted into the first positioning hole of the yoke and moved. The elastic deformation of the movable spring piece is utilized to move the movable spring piece so that the clearance fitting hole of the movable spring piece is matched with the convex bulge of the yoke. After the external positioning needle is removed, the elastic deformation of the movable spring piece is utilized to return the movable spring piece so that the interference fitting hole of the movable spring piece is matched with the cylindrical convex bulge of the yoke.

2. The connection structure between the dynamic spring and the yoke of a miniaturized PCB relay according to claim 1, characterized in that: The convex bulge is cylindrical; after the movable spring piece and the yoke iron are matched with the cylindrical convex bulge through the interference fit hole, the local position of the movable spring piece and the yoke iron are fixed by laser welding.

3. The connection structure between the dynamic spring and the yoke of a miniaturized PCB relay according to claim 2, characterized in that: A laser welding mark is provided at a local position of the movable spring piece, and the laser welding mark is two indentations. The movable spring piece and the yoke are fixed to each other at a position between the two indentations by laser welding.

4. The connection structure between the dynamic spring and the yoke of a miniaturized PCB relay according to claim 3, characterized in that: The yoke has two cylindrical bulges, which are arranged at the same horizontal position of the yoke; the movable spring has two corresponding bulge matching holes; and the two indentations are arranged between the two bulge matching holes.

5. The connection structure between the dynamic spring and the yoke of a miniaturized PCB relay according to claim 1, 2, 3 or 4, characterized in that: The distance from the center of the interference fit hole in the convex fitting hole of the movable spring to the yoke cutting edge is equal to or smaller than the distance from the center of the convex fitting hole of the yoke to the yoke cutting edge.

6. The connection structure between the dynamic spring and the yoke of a miniaturized PCB relay according to claim 1, 2, 3 or 4, characterized in that: The distance from the lowest point of the convex fitting hole of the movable spring to the yoke cutting edge is equal to or smaller than the distance from the lowest point of the convex fitting hole of the yoke to the yoke cutting edge.

7. The connection structure between the dynamic spring and the yoke of a miniaturized PCB relay according to claim 1, characterized in that: The convex fitting hole of the movable spring piece is a waist-shaped hole; the waist-shaped hole is vertically arranged; the clearance fitting hole of the convex fitting hole of the movable spring piece is the middle part of the waist-shaped hole, and the interference fitting hole of the convex fitting hole of the movable spring piece is the lower part of the waist-shaped hole.

8. The connection structure between the dynamic spring and the yoke of a miniaturized PCB relay according to claim 4, characterized in that: The first positioning hole of the yoke is arranged in the middle of the two cylindrical bulges, and the first positioning hole and the two cylindrical bulges are staggered in the up-down direction; the second positioning hole of the movable spring is arranged in the middle of the two bulge matching holes, and the second positioning hole and the two bulge matching holes are staggered in the up-down direction.

9. A method for assembling a dynamic spring and a yoke of a miniaturized PCB relay, characterized in that: The steps include: Fix the partial position of the horizontal side of the L-shape of the movable spring with the armature; Place the vertical side of the L-shaped movable spring against the yoke, and place one end of the armature fixed by the horizontal side of the L-shaped movable spring on the edge of the yoke; Insert the circular positioning needle into the circular second positioning hole of the movable spring piece, and extend it to the middle of the waist-shaped first positioning hole of the yoke iron; By utilizing the elastic deformation of the movable spring, the positioning needle is pulled downward to deform the movable spring downward, so that the waist-shaped convex bulge of the movable spring fits into the middle of the matching hole and the cylindrical convex bulge of the yoke iron with a gap; By utilizing the elastic deformation of the movable spring, the positioning pin is removed, the movable spring is deformed upward, and the waist-shaped convex bulge of the movable spring is interference-fitted with the lower part of the matching hole and the cylindrical convex bulge of the yoke iron; Laser welding is adopted at the position between the two indentations of the moving spring to fix the moving spring and the yoke iron.

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