Welding positioning device for double-breakpoint moving contact assembly of molded case circuit breaker

Abstract

The utility model relates to the technical field of welding of contact assemblies in the electrical industry, in particular to a welding positioning device for a double-breakpoint moving contact assembly of a molded case circuit breaker, which is used for helping welding of the moving contact assembly, the moving contact assembly comprises a copper piece and a silver contact, and comprises a base, an upper electrode and a lower electrode, the lower electrode is arranged on the base, and the upper electrode is arranged on the base. The upper electrode and the lower electrode are symmetrically arranged, a welding part used for welding a moving contact assembly is formed between the upper electrode and the lower electrode, and the base is further provided with an adjusting assembly used for adjusting the position of a copper piece and a limiting assembly used for limiting the position of a silver contact. Compared with manual welding, the welding quality and the welding efficiency are greatly improved, the structure is simplified, the cost is low, the welding size precision can be guaranteed, and earlier-stage sample production and small-batch production of products are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of welding contact assemblies in the electrical industry, in particular to a welding positioning device for a double-breakpoint moving contact assembly of a molded case circuit breaker. Background Art

[0002] A molded case circuit breaker (MCCB) is a switchgear that incorporates the contact assembly, arc extinguishing chamber, trip unit, and operating mechanism within a plastic casing. As the core electrical contact component within the circuit breaker, the contact assembly's weld quality largely determines the switch's service life, making the weld dimensions of the contact assembly particularly important. Among circuit breakers, the MCCB is a common type, characterized by its plastic casing, offering advantages such as compact size, light weight, and easy installation.

[0003] In the manufacturing process of molded case circuit breakers, the welding of the moving contact assembly is a key process that directly affects the performance and service life of the circuit breaker. The welding of the moving contact assembly of molded case circuit breakers is usually carried out by manual welding or semi-automatic welding. In the early stage of sample development, manual welding requires manual operation without the assistance of welding equipment. The labor intensity is high, the welding quality is unstable, and the production efficiency is low. While fully automatic welding can improve production efficiency, the equipment cost is high, the operation is complicated, and the maintenance is difficult. This is not conducive to the early stage sample production and small batch production of the product. Therefore, the existing welding method can no longer meet the needs of modern industrial production, and a new welding method is urgently needed to solve these problems. Utility Model Content

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a welding positioning device for a double-breakpoint moving contact assembly of a molded case circuit breaker. The present invention is a tooling fixture for assisting in the welding of moving contacts. Compared with manual welding, the welding quality and efficiency are greatly improved. The streamlined structure not only reduces the cost but also ensures the welding dimensional accuracy, which is beneficial to the early sample production and small batch production of the product.

[0005] The technical solution adopted by the present utility model is as follows: a welding positioning device for a double-breakpoint moving contact assembly of a molded case circuit breaker, which is used to assist in the welding of the moving contact assembly. The moving contact assembly includes a copper piece and a silver contact, and includes a base, an upper electrode and a lower electrode. The lower electrode is arranged on the base. The upper electrode and the lower electrode are symmetrically arranged and a welding portion for welding the moving contact assembly is formed therebetween. The base is also provided with an adjustment component for adjusting the position of the copper piece and a limit component for limiting the position of the silver contact.

[0006] The adjustment assembly includes a base for placing the copper part and a first adjustment block. The base is provided with a first dovetail tenon, and the first adjustment block is provided with a first dovetail groove. The base forms a sliding fit with the first adjustment block by sliding the first dovetail tenon arranged in the first dovetail groove. The side of the base is provided with a first adjustment screw for limiting the sliding fit between the base and the first adjustment block.

[0007] The adjustment assembly also includes a second adjustment block, which is installed on the base through a second dovetail tenon. The second adjustment block and the first adjustment block are slidably engaged through a protrusion and a groove. The axis of the groove is perpendicular to the axis of the first dovetail groove. A second adjustment screw is provided on the side of the base for limiting the sliding engagement of the second adjustment block and the first adjustment block.

[0008] The limiting assembly includes a limiting plate slidably arranged on the base, the limiting plate is moved closer to or away from the welding part through a sliding member, and a limiting groove with a limiting silver contact is formed at one end of the limiting plate close to the welding part.

[0009] The sliding member includes a guide rail and a guide rail seat. The guide rail is slidably arranged on the guide rail seat. The guide rail seat is slidably engaged with the base through a third dovetail tenon. The axis of the third dovetail tenon is perpendicular to the axis of the guide rail. The guide rail seat is also provided with a third adjusting screw for limiting the sliding engagement between the guide rail seat and the base.

[0010] One end of the guide rail close to the limiting groove is provided with a slot adapted to the copper piece. When the limiting assembly is close to the welding portion, the limiting groove is limitedly matched with the silver contact and the slot is limitedly matched with the copper piece.

[0011] The base, guide rail and guide rail seat are all made of 45# steel, the base, first adjustment block, second adjustment block and limit plate are all made of Cr12MoV, and the upper electrode and lower electrode are both made of chromium zirconium copper / copper tungsten 80.

[0012] The beneficial effects of the present invention are as follows: the present invention is a tooling fixture for assisting in the welding of moving contacts, which greatly improves the welding quality and efficiency compared to manual welding, and has a streamlined structure, which is not only low-cost but also ensures the accuracy of welding dimensions, which is beneficial to the early sample production and small-batch production of the product, thereby improving the performance and service life of the circuit breaker. The welding tooling fixture can also be widely used in the welding processing of various mechanical parts, and can meet the demand for efficient and high-quality welding in the field of mechanical manufacturing. The dimensional tolerance range of parts such as position, symmetry, and center distance is ≤0.1mm, which meets the welding dimension requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still fall within the scope of the present invention.

[0014] Figure 1 This is a structural diagram of a welding positioning device for a double-breakpoint moving contact assembly of a molded case circuit breaker according to the present invention;

[0015] Figure 2 It is a cross-sectional schematic diagram of the utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the adjustment component in the present utility model;

[0017] In the figure, 1-copper part, 2-silver contact, 3-base, 4-upper electrode, 5-lower electrode, 6-welding part, 7-base, 8-first adjusting block, 9-first dovetail tenon, 10-first dovetail groove, 11-first adjusting screw, 12-second adjusting block, 13-second dovetail tenon, 14-bump, 15-groove, 16-second adjusting screw, 17-limiting plate, 18-limiting groove, 19-guide rail, 20-guide rail seat, 21-third dovetail tenon, 22-third adjusting screw, 23-slot. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0019] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two non-identical entities or non-identical parameters with the same name. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. Subsequent embodiments will not explain this one by one.

[0020] The directional and positional terms used in this invention, such as "upper," "lower," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are used solely to refer to the directions or positions in the accompanying drawings. Therefore, the directional and positional terms used are intended to illustrate and facilitate understanding of this invention and are not intended to limit the scope of protection of this invention.

[0021] like Figures 1 to 3As shown, an embodiment of the present invention is a welding positioning device for a double-break moving contact assembly of a molded case circuit breaker, which is used to assist in the welding of the moving contact assembly. The moving contact assembly includes a copper piece 1 and a silver contact 2, including a base 3, an upper electrode 4 and a lower electrode 5. The lower electrode 5 is arranged on the base 3. The upper electrode 4 and the lower electrode 5 are symmetrically arranged and a welding portion 6 for welding the moving contact assembly is formed therebetween. The base 3 is also provided with an adjustment component for adjusting the position of the copper piece 1 and a limit component for limiting the position of the silver contact 2.

[0022] The beneficial effects of such a setting are as follows: the utility model is a tooling fixture for assisting in the welding of moving contacts, which greatly improves the welding quality and efficiency compared to manual welding, and has a streamlined structure, which is not only low-cost but also ensures the welding dimensional accuracy, which is beneficial to the early sample production and small-batch production of the product, thereby improving the performance and service life of the circuit breaker. The welding tooling fixture can also be widely used in the welding processing of various mechanical parts, and can meet the demand for efficient and high-quality welding in the field of mechanical manufacturing. The dimensional tolerance range of parts such as position, symmetry, and center distance is ≤0.1mm, which meets the welding size requirements.

[0023] The end portion of the lower electrode corresponding to the welding portion has a copper part-shaped structure, which makes welding more stable.

[0024] It is further provided that the adjustment assembly includes a base 7 for placing the copper part 1 and a first adjustment block 8, the base 7 is provided with a first dovetail tenon 9, the first adjustment block 8 is provided with a first dovetail groove 10, the base 7 forms a sliding fit with the first adjustment block 8 by sliding the first dovetail tenon 9 in the first dovetail groove 10, and the side of the base 7 is provided with a first adjustment screw 11 for limiting the sliding fit between the base 7 and the first adjustment block 8.

[0025] The beneficial effects of this arrangement are as follows: the base and the first adjusting block slide relative to each other, so that the base can drive the copper part to move in the horizontal direction, and the structural connection of the dovetail groove is more secure and prevents it from falling off. Before adjusting the base, it is necessary to loosen the first adjusting screw first, and then tighten it to fix the position after adjusting it into place, which can meet the needs of fine-tuning the horizontal position of the copper part during welding.

[0026] It is further provided that the adjustment assembly also includes a second adjustment block 12, which is installed on the base 3 through a second dovetail tenon 13, and the second adjustment block 12 and the first adjustment block 8 are slidingly matched through the protrusion 14 and the groove 15, and the axis of the groove 15 is perpendicular to the axis of the first dovetail groove 10, and the side of the base 3 is provided with a second adjustment screw 16 for limiting the sliding fit of the second adjustment block 12 and the first adjustment block 8.

[0027] This arrangement offers the following beneficial effects: the first adjustment block slides relative to the second adjustment block, employing a protrusion-and-groove structure for smoother movement. This allows the second adjustment block to drive the base in vertical motion, and once fully adjusted, it is secured with a second adjustment screw. This allows for fine-tuning of the vertical position of the copper component during welding. This adjustment assembly structure reduces equipment costs, simplifies operation, facilitates maintenance, and is suitable for larger-scale production. Both the first and second adjustment screws utilize M6 hexagon socket head cap screws.

[0028] It is further configured that the limiting assembly includes a limiting plate 17 slidably arranged on the base 3, and the limiting plate 17 moves closer to or away from the welding part 6 through a sliding member. A limiting groove 18 for limiting the silver contact 2 is opened at one end of the limiting plate 17 close to the welding part 6.

[0029] The beneficial effects of this arrangement are as follows: the position of the silver contacts during welding is limited by the limit plate, ensuring that the size of the silver contacts after welding is within the tolerance range, ensuring welding quality, and improving the service life of the product.

[0030] It is further provided that the sliding member includes a guide rail 19 and a guide rail seat 20, the guide rail 19 is slidably set on the guide rail seat 20, the guide rail seat 20 is slidingly matched with the base 3 through a third dovetail tenon 21, the axis of the third dovetail tenon 21 is perpendicular to the axis of the guide rail 19, and the guide rail seat 20 is also provided with a third adjusting screw 22 for limiting the sliding fit of the guide rail seat 20 and the base 3.

[0031] The beneficial effects of this arrangement are as follows: the guide rail drives the limit plate to slide, and the guide rail seat can be fine-tuned in the horizontal direction through the third dovetail joint, which facilitates fine-tuning of the symmetry dimension. The third adjustment screw is an M3 hexagon socket screw.

[0032] It is further provided that one end of the guide rail 19 close to the limiting groove 18 is provided with a slot 23 adapted to the copper part 1. When the limiting assembly is close to the welding part 6, the limiting groove 18 is limitedly matched with the silver contact 2 and the slot 23 is limitedly matched with the copper part 1.

[0033] The beneficial effects of this arrangement are as follows: the limiting groove limits the silver contact, the slot limits the copper part, and the limiting at the same time can better and faster ensure the symmetry of the welding size of the moving contact assembly, which can improve production efficiency and meet production needs.

[0034] It is further configured that the base 3, guide rail 19 and guide rail seat 20 are all made of 45# steel, the base 7, first adjustment block 8, second adjustment block 12 and limit plate 17 are all made of Cr12MoV, and the upper electrode 4 and lower electrode 5 are both made of chromium zirconium copper / copper tungsten 80.

[0035] The beneficial effects of this setting are as follows: it improves the durability of the tooling and fixtures, extends their service life, and meets the needs of larger-scale production.

[0036] The steps for using this positioning device are as follows:

[0037] Step 1: Fix the second adjustment block and the second adjustment block to the left end of the base in sequence, then fix them with M6 hexagon socket screws, and then fix the assembly base to the first adjustment block to complete the assembly of the left end adjustment component;

[0038] Step 2: Use M3 hexagon socket screws to fix the guide rail seat to the right end of the base, then assemble the guide rail to the guide rail seat, and then use M4 screws to assemble the limit plate to the guide rail. Complete the assembly of the welding device tooling and the right end limit assembly. Fix the assembled positioning device on the lower electrode for size fine-tuning;

[0039] Step 3: Fix the base to the left side of the lower electrode, fix the left end of the welded base with the first adjustment block to fine-tune the front and back dimensions of the product, and then fix the second adjustment block to meet the needs of fine-tuning the copper parts during the upper and lower welding process of the product.

[0040] Step 4: Design the guide rail seat to be fixed on the right end of the base, which can be used to fine-tune the symmetry of the left and right silver contacts of the welding product. The guide rail is fixed on the guide rail seat, and the thickness of the copper part slotted at the front end of the guide rail is adjusted to better ensure the symmetry of the product.

[0041] Step 5: Design the silver point limit plate and fix it on the front and rear sliding rails to ensure that the size of the silver contact is within the tolerance range after welding.

[0042] Step 6: After the tooling is debugged, place the copper piece on the left end base, insert it into the welding part of the lower electrode, move the guide rail to the left, the slot supports the copper piece, put the silver contact to be welded into the limit plate, step on the foot switch, the upper electrode moves downward, press the silver contact, move the guide rail to the right, step on the foot switch again to start welding, and complete the product welding.

[0043] Step 7: Repeat the process of welding the silver contacts at the other end to complete the whole welding process.

[0044] The above are the specific steps of this embodiment. Through this welding fixture, precise welding of the double-break moving contact assembly of the molded case circuit breaker can be achieved, thereby improving welding quality, reducing labor intensity, and improving production efficiency.

[0045] Due to the advanced nature of this technical solution, it can be widely used in application fields such as power engineering equipment, machinery manufacturing, and welding technology. First, in the field of power engineering equipment, the welding jig for the double-breakpoint moving contact assembly of the molded case circuit breaker of the present invention can greatly improve the welding quality of the moving contact assembly of the molded case circuit breaker, thereby improving the performance and service life of the circuit breaker. At the same time, due to its simple production and low cost, it can ensure the dimensional accuracy of the product welding in the early sample stage and small batch production. Therefore, it has obvious advantages in large-scale production and can meet the demand for efficient and high-quality welding in the field of power engineering equipment. Secondly, in the field of machinery manufacturing, the welding jig of the present invention can be widely used in the welding processing of various mechanical parts. Due to its reasonable design and simple operation, it can greatly improve welding efficiency, reduce labor intensity, and improve welding quality. Therefore, it is very attractive to machinery manufacturing companies and can meet the demand for efficient and high-quality welding in the field of machinery manufacturing. Finally, in the field of welding technology, the welding jig of the present invention can be used as a new method for welding technology, providing new ideas for the development of welding technology. Due to its simple production, low cost and easy operation, it can be promoted and applied to various welding processes. Therefore, it has great application value in the field of welding technology and can meet the needs of the welding technology field for efficient and high-quality welding.

[0046] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A welding positioning device for a double-breakpoint moving contact assembly of a molded case circuit breaker, used to assist in welding the moving contact assembly, wherein the moving contact assembly comprises a copper part (1) and a silver contact (2), and is characterized in that: The invention comprises a base (3), an upper electrode (4) and a lower electrode (5), wherein the lower electrode (5) is arranged on the base (3), the upper electrode (4) and the lower electrode (5) are symmetrically arranged and a welding portion (6) for welding a moving contact assembly is formed therebetween, and an adjusting component for adjusting the position of the copper part (1) and a limiting component for limiting the position of the silver contact (2) are also provided on the base (3).

2. A welding positioning device for a double-breakpoint moving contact assembly of a molded case circuit breaker according to claim 1, characterized in that: The adjustment assembly comprises a base (7) for placing the copper part (1) and a first adjustment block (8), wherein the base (7) is provided with a first dovetail tenon (9), and the first adjustment block (8) is provided with a first dovetail groove (10), and the base (7) forms a sliding fit with the first adjustment block (8) by sliding the first dovetail tenon (9) arranged in the first dovetail groove (10), and a first adjustment screw (11) is provided on the side of the base (7) for limiting the sliding fit between the base (7) and the first adjustment block (8).

3. The welding positioning device for the double-breakpoint moving contact assembly of a molded case circuit breaker according to claim 2, characterized in that: The adjustment assembly further comprises a second adjustment block (12), the second adjustment block (12) being mounted on the base (3) via a second dovetail tenon (13), the second adjustment block (12) and the first adjustment block (8) being slidably engaged via a protrusion (14) and a groove (15), the axis of the groove (15) being perpendicular to the axis of the first dovetail groove (10), and a second adjustment screw (16) for limiting the slidable engagement of the second adjustment block (12) and the first adjustment block (8) being provided on a side of the base (3).

4. A welding positioning device for a double-breakpoint moving contact assembly of a molded case circuit breaker according to claim 3, characterized in that: The limiting assembly comprises a limiting plate (17) slidably arranged on the base (3), wherein the limiting plate (17) approaches or moves away from the welding portion (6) through a sliding member, and a limiting groove (18) for a limiting silver contact (2) is provided at one end of the limiting plate (17) close to the welding portion (6).

5. The welding positioning device for the double-break moving contact assembly of a molded case circuit breaker according to claim 4, characterized in that: The sliding member comprises a guide rail (19) and a guide rail seat (20), wherein the guide rail (19) is slidably arranged on the guide rail seat (20), and the guide rail seat (20) is slidably engaged with the base (3) via a third dovetail tenon (21), wherein the axis of the third dovetail tenon (21) is perpendicular to the axis of the guide rail (19), and the guide rail seat (20) is further provided with a third adjusting screw (22) for limiting the sliding engagement between the guide rail seat (20) and the base (3).

6. A welding positioning device for a double-breakpoint moving contact assembly of a molded case circuit breaker according to claim 5, characterized in that: One end of the guide rail (19) close to the limiting groove (18) is provided with a slot (23) adapted to the copper piece (1). When the limiting assembly is close to the welding portion (6), the limiting groove (18) is in limiting cooperation with the silver contact (2) and the slot (23) is in limiting cooperation with the copper piece (1).

7. The welding positioning device for the double-breakpoint moving contact assembly of a molded case circuit breaker according to claim 5, characterized in that: The base (3), guide rail (19) and guide rail seat (20) are all made of 45# steel, the base (7), first adjustment block (8), second adjustment block (12) and limit plate (17) are all made of Cr12MoV, and the upper electrode (4) and lower electrode (5) are all made of chromium zirconium copper / copper tungsten 80.

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