A welding process for a combined positioning tool, a driving opening and closing mechanism, and a moving contact mechanism

Abstract

The present invention relates to a combined positioning tool, a driving mechanism and a welding process for a moving contact mechanism, wherein the tool comprises a tool base plate, a left positioning plate and a right positioning plate, wherein the left positioning plate is provided with a plate assembly positioning structure and a total positioning structure, and the right positioning plate is provided with a moving contact assembly positioning structure, the connecting plate and the terminal board are placed in the plate assembly positioning structure so as to be welded into a plate assembly, the moving contact, the soft connection and the double gold sheet are placed in the moving contact assembly positioning structure so as to be welded into a moving contact assembly, the plate assembly, the moving contact assembly and the arc-starting sheet are placed in the total positioning structure so as to be welded into a moving contact mechanism, and the components of multiple moving contact mechanisms can all be placed in a combined positioning tool, and can be placed at one time or in sequence. The work is highly integrated, and all welding processes are completed on one tool, so that product consistency is guaranteed, the qualified rate is high and the production efficiency is high.

Description

Technical Field

[0001] The present invention relates to the field of welding production, and in particular to a welding process of a combined positioning tool, a driving opening and closing mechanism and a moving contact mechanism. Background Art

[0002] The moving contact mechanism of the miniature circuit breaker is as follows Figure 1 The figure shows a plurality of parts assembly including a mechanism base 01, a moving contact 02, a flexible connection 03, a bimetallic sheet 04, a connecting plate 05, a terminal board 06, an arc starting sheet 07, etc. These parts are connected together by welding, so there are multiple welding points. It is currently known that the moving contact mechanism is mainly operated by multiple manual operators to perform single-point welding on all welding points one by one on multiple welding machines; or a single welding point is welded by an automated special machine, that is, as many special welding machines are required as there are welding points. These parts are not placed on a tool for welding. The defects are poor product welding consistency and low precision, and materials need to be transferred between multiple welding equipment, increasing labor and transfer costs. Summary of the Invention

[0003] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is how to complete the welding of the moving contact mechanism on a single tool. To this end, a combined positioning tool, a driving opening and closing mechanism, and a moving contact mechanism welding process are provided. The specific technical solution is as follows:

[0004] A combined positioning tool comprises a tool base plate, a left positioning plate and a right positioning plate. The left positioning plate is installed on the left side above the tool base plate, and the right positioning plate is installed on the right side above the tool base plate. The left positioning plate is provided with a plate assembly positioning structure and a total positioning structure. The right positioning plate is provided with a moving contact assembly positioning structure. The connecting plate and the terminal plate are placed in the plate assembly positioning structure so as to be welded into a plate assembly. The moving contact, the soft connection and the double gold sheet are placed in the moving contact assembly positioning structure so as to be welded into a moving contact assembly. The plate assembly, the moving contact assembly and the arc-starting sheet are placed in the total positioning structure so as to be welded into a moving contact mechanism.

[0005] As a preferred solution of the present invention, the plate assembly positioning structure includes a connecting plate positioning groove and a terminal board positioning groove. The connecting plate positioning groove and the terminal board positioning groove are arranged in sequence on the left positioning plate. The connecting plate positioning groove is close to the terminal board positioning groove. The tail end of the connecting plate placed in the connecting plate positioning groove is overlapped with the head end of the terminal board placed in the terminal board positioning groove.

[0006] As a preferred solution of the present invention, a connecting plate clamping pin is installed on the side of the connecting plate positioning groove, the connecting plate clamping pin is installed on the connecting plate movable block, the connecting plate movable block is slidably installed between the tooling base plate and the left positioning plate, the first spring drives the connecting plate movable block to move left, the connecting plate clamping pin presses the head end of the connecting plate, and the bottom of the tooling base plate is provided with a first elongated hole corresponding to the position of the connecting plate movable block.

[0007] As a preferred solution of the present invention, the moving contact assembly positioning structure includes a moving contact positioning groove, a soft connection positioning groove and a bimetallic strip positioning groove. The moving contact positioning groove, the soft connection positioning groove and the bimetallic strip positioning groove are arranged in sequence on the right positioning plate. The moving contact is placed obliquely in the moving contact positioning groove, the soft connection is placed horizontally in the soft connection positioning groove, the bimetallic strip is placed vertically in the bimetallic strip positioning groove, the tail end of the moving contact overlaps the left end of the soft connection, and the right end of the soft connection overlaps the tail end of the bimetallic strip.

[0008] As a preferred solution of the present invention, a soft connection movable block is slidably installed between the tooling base plate and the right positioning plate. The soft connection movable block is provided with a protrusion, which extends out of the right positioning plate. The soft connection positioning groove is formed by the outer wall of the right positioning plate and the inner wall of the protrusion. The second spring drives the protrusion to clamp the soft connection.

[0009] As a preferred solution of the present invention, a bimetallic strip pressing pin is installed on the side of the bimetallic strip positioning groove, the bimetallic strip pressing pin is installed on the bimetallic strip movable block, the bimetallic strip movable block is slidably installed between the tooling base plate and the right positioning plate, the third spring drives the bimetallic strip movable block to move left, and the bimetallic strip pressing pin presses the bimetallic strip.

[0010] As a preferred solution of the present invention, the overall welding positioning structure includes a mechanism seat positioning groove, a moving contact assembly positioning groove, a plate assembly positioning groove and an arc-starting piece final positioning groove. The mechanism seat positioning groove, the moving contact assembly positioning groove and the plate assembly positioning groove are arranged in sequence on the left positioning plate. The mechanism seat is placed in the mechanism seat positioning groove, the moving contact assembly is placed in the moving contact assembly positioning groove, the moving contact overlaps the mechanism seat, the plate assembly is placed in the plate assembly positioning groove, and the head end of the connecting plate overlaps the head end of the bimetallic strip.

[0011] As a preferred solution of the present invention, a moving contact assembly clamping pin is installed on the side of the moving contact assembly positioning groove, the moving contact assembly clamping pin is installed on the assembly movable block, the assembly movable block is slidably installed between the tooling base plate and the left positioning plate, the fourth spring drives the assembly movable block to move left, and the moving contact assembly clamping pin presses the moving contact assembly.

[0012] As a preferred solution of the present invention, an arc-striking piece initial positioning groove is provided on the right positioning plate, and the arc-striking piece is initially placed in the arc-striking piece initial positioning groove.

[0013] As a preferred solution of the present invention, the tooling base plate is installed above the mounting seat through insulating pins, and an insulating plate is provided between the tooling base plate and the mounting seat.

[0014] A driving opening and closing mechanism for the above-mentioned combined positioning tooling includes a lifting power unit, a slider, a slide rail, a lifting plate, a transverse movement force unit and a ejector pin. The lifting power unit drives the slider to move up and down. The slider is movably mounted on the slide rail. The slider drives the lifting plate to move. The transverse movement force unit is installed on the lifting plate. The transverse movement force unit drives the ejector pin to move left and right.

[0015] A moving contact mechanism welding process includes the following steps:

[0016] ① Welding of the moving contact assembly: the moving contact is placed obliquely in the moving contact positioning groove, the flexible connection is placed horizontally in the flexible connection positioning groove, the bimetallic strip is placed vertically in the bimetallic strip positioning groove, the tail end of the moving contact overlaps the left end of the flexible connection, and the right end of the flexible connection overlaps the tail end of the bimetallic strip. The moving contact, flexible connection, and bimetallic strip are welded together to make the moving contact assembly;

[0017] ② Panel assembly welding: the connecting plate is placed in the connecting plate positioning groove, the terminal board is placed in the terminal board positioning groove, the rear end of the connecting plate is overlapped with the front end of the terminal board, and the connecting plate and the terminal board are welded together to make a panel assembly;

[0018] ③ Welding the moving contact assembly to the mechanism seat, placing the mechanism seat in the mechanism seat positioning groove, placing the moving contact assembly obtained in step ① into the moving contact assembly positioning groove, overlapping the mechanism seat with the moving contact, and welding the moving contact assembly to the mechanism seat to obtain component 1;

[0019] ④ Welding the plate assembly to the bimetallic strip: Place the plate assembly obtained in step ② into the plate assembly positioning slot, overlap the head end of the connecting plate with the head end of the bimetallic strip, and weld component 1 to the plate assembly to obtain component 2;

[0020] ⑤ The arc striking piece is welded to the bimetallic piece, and the arc striking piece is transferred from the initial positioning groove of the arc striking piece to the final positioning groove of the arc striking piece. The tail end of the arc striking piece overlaps the head end of the bimetallic piece, and the arc striking piece and the bimetallic piece are welded to produce a moving contact mechanism.

[0021] The beneficial effects of the present invention are as follows: the connecting plate and the terminal plate are placed in the positioning structure of the plate assembly so as to be welded into a plate assembly; the moving contact, the soft connection and the double gold sheet are placed in the positioning structure of the moving contact assembly so as to be welded into a moving contact assembly; the plate assembly, the moving contact assembly and the arc-starting sheet are placed in the overall positioning structure so as to be welded into a moving contact mechanism; the components of multiple moving contact mechanisms can all be placed in a combined positioning tool, which can be placed at one time or in sequence. The work is highly integrated, and all welding processes are completed on one tool, so that product consistency is guaranteed, the qualified rate is high and the production efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional diagram of the moving contact mechanism;

[0023] Figure 2It is a top view of the tooling of the present invention;

[0024] Figure 3 This is a three-dimensional diagram of the tooling of the present invention without the parts of the moving contact mechanism placed therein;

[0025] Figure 4 This is a three-dimensional diagram of the tooling of the present invention after placing various parts of the moving contact mechanism;

[0026] Figure 5 It is an exploded view of the tooling of the present invention;

[0027] Figure 6 is a perspective view of the tooling of the present invention as viewed from below;

[0028] Figure 7 This is a schematic diagram of the installation of the tooling substrate of the present invention;

[0029] Figure 8 It is a three-dimensional diagram of the tooling of the present invention cooperating with the driving opening and closing mechanism;

[0030] Figure 9 It is a three-dimensional diagram of the driving opening and closing mechanism of the present invention;

[0031] Figure 10 It is a welding process structure diagram of the present invention. DETAILED DESCRIPTION

[0032] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0033] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions 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 position or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0035] like Figure 2-4As shown, a combined positioning tool comprises a tooling base plate 1, a left positioning plate 2 and a right positioning plate 3. The left positioning plate 2 is installed on the left side above the tooling base plate 1, and the right positioning plate 3 is installed on the right side above the tooling base plate 1. The left positioning plate 2 is provided with a plate assembly positioning structure A and a total positioning structure B. The right positioning plate 3 is provided with a moving contact assembly positioning structure C. The connecting plate 05 and the terminal board 06 are placed in the plate assembly positioning structure A so as to be welded into a plate assembly. The moving contact 02, the soft connection 03 and the double gold sheet 04 are placed in the moving contact assembly positioning structure C so as to be welded into a moving contact assembly. The plate assembly, the moving contact assembly and the arc-starting sheet 07 are placed in the total positioning structure B so as to be welded into a moving contact mechanism.

[0036] like Figure 3-5 When the left end of the connecting plate 05 is pressed, the connecting plate 05 is pressed against the left end of the connecting plate 05 and the left end of the connecting plate 05 is pressed against the right end of the connecting plate 05.

[0037] like Figure 2-4 As shown, the moving contact assembly positioning structure C includes a moving contact positioning groove 10, a soft connection positioning groove 11 and a bimetallic strip positioning groove 12. The moving contact positioning groove 10, the soft connection positioning groove 11 and the bimetallic strip positioning groove 12 are arranged in sequence on the right positioning plate 3. The moving contact 02 is placed obliquely in the moving contact positioning groove 10, the soft connection 03 is placed horizontally in the soft connection positioning groove 11, and the bimetallic strip 04 is placed vertically in the bimetallic strip positioning groove 12. The tail end of the moving contact 02 overlaps the left end of the soft connection 03, and the right end of the soft connection 03 overlaps the tail end of the bimetallic strip 04. The moving contact 02 and the soft connection 03, and the soft connection 03 and the bimetallic strip 04 can be welded and fixed together by projection welding.

[0038] In addition, a soft connection movable block 13 is slidably installed between the tooling base plate 1 and the right positioning plate 3. The soft connection movable block 13 is provided with a protrusion 14. The protrusion 14 extends out of the right positioning plate 3. The soft connection positioning groove 11 is formed by the outer wall of the right positioning plate and the inner wall of the protrusion. The second spring 15 drives the protrusion 14 to clamp the soft connection 03. A driving circular hole 16 is provided at the bottom of the soft connection movable block 13.

[0039] Specifically, a bimetallic strip pressing pin 17 is installed on the side of the bimetallic strip positioning groove 12, and the bimetallic strip pressing pin 17 is installed on the bimetallic strip movable block 18. The bimetallic strip movable block 18 is slidably installed between the tooling base plate 1 and the right positioning plate 3. The third spring 19 drives the bimetallic strip movable block 18 to move left, and the bimetallic strip movable block 18 drives the bimetallic strip pressing pin 17 to move left. The bimetallic strip pressing pin 17 presses the bimetallic strip 04, and a second elongated hole 19a corresponding to the position of the bimetallic strip movable block 18 is provided at the bottom of the tooling base plate 1.

[0040] like Figure 2-4 As shown, the total welding positioning structure B includes a mechanism seat positioning groove 20, a moving contact assembly positioning groove 21, a plate assembly positioning groove 22 and an arc-starting piece final positioning groove 24. The mechanism seat positioning groove 20, the moving contact assembly positioning groove 21 and the plate assembly positioning groove 22 are sequentially arranged on the left positioning plate 2. The mechanism seat 01 is placed in the mechanism seat positioning groove 20. The moving contact assembly positioning groove 21 is composed of a fixed moving contact part and a fixed bimetallic part. When the moving contact assembly is placed in the moving contact assembly positioning groove 21, the moving contact is on the left and the bimetallic strip is on the right. The moving contact overlaps the mechanism seat. The plate assembly is placed in the plate assembly positioning groove 22, and the head end of the connecting plate overlaps the head end of the bimetallic strip. In addition, a moving contact assembly clamping pin 25 is installed on the side of the fixed bimetallic strip part of the moving contact assembly positioning groove 21. The moving contact assembly clamping pin 25 is installed on the assembly movable block 26. The assembly movable block 26 is slidably installed between the tooling base plate 1 and the left positioning plate 2. The fourth spring 27 drives the assembly movable block 26 to move left, and the moving contact assembly clamping pin 25 presses the bimetallic strip. The bottom of the tooling base plate 1 is provided with a third elongated hole 27 corresponding to the position of the assembly movable block 26.

[0041] Specifically, an arc-striking piece initial positioning groove 28 is provided on the right positioning plate 3. The arc-striking piece 07 is initially placed in the arc-striking piece initial positioning groove 28, and is then sent to the arc-striking piece final positioning groove 24 after the connecting plate and the bimetallic strip are welded.

[0042] Specifically, the above parts are placed into the positioning grooves respectively. This can be achieved by a robot or manually. It is preferably achieved by a robot because it is safe and efficient.

[0043] like Figure 7 As shown, the tooling substrate 1 is mounted above the mounting seat 29 through insulating pins 28 , and an insulating plate 30 is provided between the tooling substrate 1 and the mounting seat 29 to prevent leakage during welding.

[0044] like Figure 8 、 9As shown, a driving opening and closing mechanism for the above-mentioned combined positioning tooling includes a lifting power unit 31, a slider 32, a slide rail 33, a lifting plate 34, a transverse movement power unit 35 and an ejector pin 36. The lifting power unit 31 drives the slider 32 to move up and down. The slider 32 is movably mounted on the slide rail 33. The slider 32 drives the lifting plate 34 to move. The transverse movement power unit 35 is installed on the lifting plate 34. The transverse movement power unit 35 drives the ejector pin 36 to move horizontally. Figure 6 As shown, the first elongated hole 9, the driving circular hole 16, the second elongated hole 19a, and the third elongated hole 27 are used for inserting the ejector pin 36. The driving opening and closing mechanism can be set to multiple according to the use requirements. When the combined positioning tool moves to the top of the specified driving opening and closing mechanism, the ejector pin 36 drives the movable block to move to open the clamping pin. Taking the bimetallic strip as an example, when the combined positioning tool moves to the top of the driving opening mechanism where the bimetallic strip is loaded, the lifting power unit 31 (a driving mechanism such as a cylinder or motor or cam) drives the slider 32 to rise, and the ejector pin 36 is inserted into the second elongated hole 19a to insert the bimetallic strip movable block 18. The horizontal moving power unit 35 drives the ejector pin 36 to move right, and the ejector pin 36 drives the bimetallic strip movable block 18 to move right. The bimetallic strip movable block 18 drives the clamping pin 17 to move right to open and facilitate the insertion or removal of the bimetallic strip. The positioning and opening principles of other components are the same as those of the bimetallic strip and will not be repeated here.

[0045] The process structure diagram of welding using the above tooling is as follows: Figure 10 As shown, a moving contact mechanism welding process includes the following steps:

[0046] ① Welding of the moving contact assembly: the moving contact is placed obliquely in the moving contact positioning groove, the flexible connection is placed horizontally in the flexible connection positioning groove, the bimetallic strip is placed vertically in the bimetallic strip positioning groove, the tail end of the moving contact overlaps the left end of the flexible connection, and the right end of the flexible connection overlaps the tail end of the bimetallic strip. The moving contact, flexible connection, and bimetallic strip are welded together to make the moving contact assembly;

[0047] ② Panel assembly welding: the connecting plate is placed in the connecting plate positioning groove, the terminal board is placed in the terminal board positioning groove, the rear end of the connecting plate is overlapped with the front end of the terminal board, and the connecting plate and the terminal board are welded together to make a panel assembly;

[0048] ③ Welding the moving contact assembly to the mechanism seat, placing the mechanism seat in the mechanism seat positioning groove, placing the moving contact assembly obtained in step ① into the moving contact assembly positioning groove, overlapping the mechanism seat with the moving contact, and welding the moving contact assembly to the mechanism seat to obtain component 1;

[0049] ④ Welding the plate assembly to the bimetallic strip: Place the plate assembly obtained in step ② into the plate assembly positioning slot, overlap the head end of the connecting plate with the head end of the bimetallic strip, and weld component 1 to the plate assembly to obtain component 2;

[0050] ⑤ The arc striking piece is welded to the bimetallic piece, and the arc striking piece is transferred from the initial positioning groove of the arc striking piece to the final positioning groove of the arc striking piece. The tail end of the arc striking piece overlaps the head end of the bimetallic piece, and the arc striking piece and the bimetallic piece are welded to produce a moving contact mechanism.

[0051] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or replacements can be made without departing from the concept of the present invention, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. A combined positioning tool, comprising a tool base, a left positioning plate and a right positioning plate, wherein the left positioning plate is mounted on the left side above the tool base, and the right positioning plate is mounted on the right side above the tool base, characterized in that: The left positioning plate is provided with a plate assembly positioning structure and a total positioning structure, and the right positioning plate is provided with a moving contact assembly positioning structure. The connecting plate and the terminal board are placed in the plate assembly positioning structure so as to be welded into a plate assembly. The moving contact, the soft connection, and the double gold sheet are placed in the moving contact assembly positioning structure so as to be welded into a moving contact assembly. The plate assembly, the moving contact assembly, and the arc-starting sheet are placed in the total positioning structure so as to be welded into a moving contact mechanism. The plate assembly positioning structure includes a connection plate positioning groove and a wiring board positioning groove. The connection plate positioning groove and the wiring board positioning groove are sequentially arranged on the left positioning plate. The connection plate positioning groove is close to the wiring board positioning groove. The tail end of the connection plate placed in the connection plate positioning groove is overlapped with the head end of the wiring board placed in the wiring board positioning groove. The moving contact assembly positioning structure includes a moving contact positioning groove, a soft connection positioning groove and a bimetallic strip positioning groove. The moving contact positioning groove, the soft connection positioning groove and the bimetallic strip positioning groove are arranged in sequence on the right positioning plate. The moving contact is placed obliquely in the moving contact positioning groove, the soft connection is placed horizontally in the soft connection positioning groove, the bimetallic strip is placed vertically in the bimetallic strip positioning groove, the tail end of the moving contact overlaps the left end of the soft connection, and the right end of the soft connection overlaps the tail end of the bimetallic strip. A soft connection movable block is slidably installed between the tooling base plate and the right positioning plate. The soft connection movable block is provided with a protrusion, which extends out of the right positioning plate. The soft connection positioning groove is formed by the outer wall of the right positioning plate and the inner wall of the protrusion. The second spring drives the protrusion to clamp the soft connection. The overall positioning structure includes a mechanism seat positioning groove, a moving contact assembly positioning groove, a plate assembly positioning groove and an arc-starting piece final positioning groove. The mechanism seat positioning groove, the moving contact assembly positioning groove and the plate assembly positioning groove are arranged in sequence on the left positioning plate. The mechanism seat is placed in the mechanism seat positioning groove, the moving contact assembly is placed in the moving contact assembly positioning groove, the moving contact overlaps the mechanism seat, the plate assembly is placed in the plate assembly positioning groove, and the head end of the connecting plate overlaps the head end of the bimetallic strip.

2. A combined positioning tool according to claim 1, characterized in that: A connecting plate clamping pin is installed on the side of the connecting plate positioning groove, and the connecting plate clamping pin is installed on the connecting plate movable block. The connecting plate movable block is slidably installed between the tooling base plate and the left positioning plate. The first spring drives the connecting plate movable block to move left, and the connecting plate clamping pin presses the head end of the connecting plate. A first elongated hole corresponding to the position of the connecting plate movable block is provided at the bottom of the tooling base plate.

3. The combined positioning tool according to claim 1, characterized in that: A bimetallic strip pressing pin is installed on the side of the bimetallic strip positioning groove, and the bimetallic strip pressing pin is installed on the bimetallic strip movable block. The bimetallic strip movable block is slidably installed between the tooling base plate and the right positioning plate. The third spring drives the bimetallic strip movable block to move left, and the bimetallic strip pressing pin presses the bimetallic strip.

4. The combined positioning tool according to claim 1, characterized in that: A moving contact assembly clamping pin is installed on the side of the moving contact assembly positioning groove. The moving contact assembly clamping pin is installed on the assembly movable block. The assembly movable block is slidably installed between the tooling base plate and the left positioning plate. The fourth spring drives the assembly movable block to move left, and the moving contact assembly clamping pin clamps the moving contact assembly.

5. The combined positioning tool according to claim 1, characterized in that: An arc-starting piece initial positioning groove is provided on the right positioning plate, and the arc-starting piece is initially placed in the arc-starting piece initial positioning groove.

6. The combined positioning tool according to claim 1, characterized in that: The tooling base plate is installed above the mounting seat through insulating pins, and an insulating plate is arranged between the tooling base plate and the mounting seat.

7. A driving opening and closing mechanism for the combined positioning tooling according to any one of claims 1 to 6, comprising a lifting power unit, a slider, a slide rail, a lifting plate, a transverse movement power unit and a ejector pin, wherein the lifting power unit drives the slider to move up and down, the slider is movably mounted on the slide rail, the slider drives the lifting plate to move, the transverse movement power unit is installed on the lifting plate, and the transverse movement power unit drives the ejector pin to move left and right.

8. A moving contact mechanism welding process, characterized in that: The method is carried out using the combined positioning tool described in any one of claims 1 to 6, comprising the following steps: ① Welding of the moving contact assembly: the moving contact is placed obliquely in the moving contact positioning groove, the flexible connection is placed horizontally in the flexible connection positioning groove, the bimetallic strip is placed vertically in the bimetallic strip positioning groove, the tail end of the moving contact overlaps the left end of the flexible connection, and the right end of the flexible connection overlaps the tail end of the bimetallic strip. The moving contact, flexible connection, and bimetallic strip are welded together to make the moving contact assembly; ② Panel assembly welding: the connecting plate is placed in the connecting plate positioning groove, the terminal board is placed in the terminal board positioning groove, the rear end of the connecting plate is overlapped with the front end of the terminal board, and the connecting plate and the terminal board are welded together to make a panel assembly; ③ Welding the moving contact assembly to the mechanism seat, placing the mechanism seat in the mechanism seat positioning groove, placing the moving contact assembly obtained in step ① into the moving contact assembly positioning groove, overlapping the mechanism seat with the moving contact, and welding the moving contact assembly to the mechanism seat to obtain component 1; ④ Welding the plate assembly to the bimetallic strip: Place the plate assembly obtained in step ② into the plate assembly positioning slot, overlap the head end of the connecting plate with the head end of the bimetallic strip, and weld component 1 to the plate assembly to obtain component 2; ⑤ The arc striking piece is welded to the bimetallic piece, and the arc striking piece is transferred from the initial positioning groove of the arc striking piece to the final positioning groove of the arc striking piece. The tail end of the arc striking piece overlaps the head end of the bimetallic piece, and the arc striking piece and the bimetallic piece are welded to produce a moving contact mechanism.

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