A kind of tool for ring main unit circuit breaker large shaft welding

Abstract

The utility model discloses a tooling for ring main unit circuit breaker big axle welding, its characterized in that, including: bottom plate, the rear end of bottom plate is provided with rear locating plate, is used for limiting the axial displacement of big axle, the left side perpendicular welding of bottom plate has left locating plate, and cooperation rear locating plate forms L type reference locating structure, the upper portion of bottom plate is provided with a plurality of horizontal locating plate, the tooling for big axle includes elbow, interval block, big axle three parts, the position of the elbow of the upper portion of bottom plate is welded with a plurality of elbow locating plate for setting, the first groove board and second groove board are welded between adjacent elbow locating plate, the first clamping groove and second clamping groove that the interval block size matches are set up in the inboard of first groove board and second groove board, and the upper portion of first groove board and second groove board is installed respectively by the presser, and big axle is fixed by cylindrical pin cooperation, and fastener is used for fixed interval block and elbow.

Description

Technical Field

[0001] This utility model relates to the field of power equipment manufacturing, specifically to a tooling for welding the main shaft of a ring main unit circuit breaker. Background Technology

[0002] In power distribution networks, ring main units (RNBs) are critical distribution equipment widely used in urban power grids, industrial parks, and other scenarios, undertaking the core functions of circuit distribution, fault isolation, and protection. Circuit breakers, as the "heart" of the RNB, directly determine the operational stability of the RNB through the reliability of their opening and closing actions. The main shaft, a core component of the circuit breaker's drive system, plays a decisive role in the mechanical operating performance of the circuit breaker.

[0003] From a structural perspective, the main shaft of a ring main unit circuit breaker is welded together from components such as a short main shaft, crank arms, and spacers. The crank arms need to be evenly distributed along the circumference of the main shaft, and adjacent crank arms are connected by spacers to form a linkage transmission structure. The crank arms, in cooperation with other components of the circuit breaker, transmit the operating force to core components such as the arc-extinguishing chamber to realize the switching of the circuit. The spacers need to ensure the rotational flexibility between the crank arms to avoid transmission jamming. Therefore, the welding precision and assembly consistency of each component of the main shaft are the foundation for ensuring the long-term stable operation of the circuit breaker.

[0004] Currently, most workpieces are simply fixed using general-purpose fixtures, which cannot meet the requirements of welding technology. This results in poor consistency of the main shaft welding quality, high rework rate, and seriously restricts the production efficiency and quality stability of ring main unit circuit breakers. Therefore, there is an urgent need for a special welding fixture that can achieve precise positioning of the main shaft and ensure welding quality. Utility Model Content

[0005] To overcome the aforementioned deficiencies of the prior art, the purpose of this utility model is to provide a tooling for welding the main shaft of a ring main unit circuit breaker. Specifically, it is a tooling for welding the main shaft and crank arm of a ring main unit circuit breaker.

[0006] A tooling for welding the main shaft of a ring main unit circuit breaker, comprising: The base plate, which serves as a basic support component, has positioning grooves for each component on its surface to ensure that the positioning components on the base plate meet the required positioning accuracy after welding. A rear positioning plate is provided at the rear end of the base plate to limit the axial displacement of the main shaft; A left positioning plate is vertically welded to the left side of the base plate. The inner plane of the left positioning plate is in contact with the radial reference plane of the main shaft to achieve radial positioning of the main shaft. Together with the rear positioning plate, it forms an L-shaped reference positioning structure. Several horizontal positioning plates are provided on the upper part of the base plate. The horizontal positioning plates are fitted with the plane of one end of the main shaft to fix the angle of the main shaft, so that the main shaft is in a horizontal state during welding. The welding fixture for the main shaft includes three parts: a crank arm, a spacer block, and the main shaft. Several crank arm positioning plates are welded on the upper part of the base plate at the position where the crank arm is set. Each crank arm positioning plate has a U-shaped positioning groove that matches the shape of the crank arm. A first groove plate and a second groove plate are welded between adjacent crank arm positioning plates; A first slot and a second slot, matching the size of the spacer block, are formed on the inner sides of the first slot plate and the second slot plate. The first slot and the second slot are used to limit the radial displacement of the spacer block so that the spacer block is locked between adjacent crank arms. The clamping device is installed above the first groove plate and the second groove plate respectively, and the clamping shaft is fixed by the cylindrical pin. Fasteners are used for the fixed spacer block and the crank arm to prevent the spacer block and the crank arm from shifting during welding.

[0007] In a preferred embodiment of this utility model, the base plate is laser-cut from a 2mm stainless steel plate.

[0008] In a preferred embodiment of this utility model, the rear positioning plate is vertically welded to the rear end of the base plate, and the end face of the rear positioning plate is perpendicular to the base plate.

[0009] In a preferred embodiment of this utility model, the fastener is a threaded fastener, preferably a nut.

[0010] The beneficial effects of this utility model are as follows: Achieve precise positioning of multiple crank arm angles and ensure angle consistency; To prevent workpiece displacement during welding and ensure the perpendicularity deviation of the main shaft after welding; Simplify the clamping process, shorten the processing cycle, and improve production efficiency. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 .

[0012] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0013] Figure 3 This is a schematic diagram of the structure of the present invention. Figure 3 . Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope. Furthermore, in the following descriptions, well-known structures and technologies have been omitted to avoid unnecessary confusion regarding the concept of this utility model.

[0015] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0016] In order to overcome the above-mentioned problems of the prior art, this utility model discloses a tooling for welding the main shaft of a ring main unit circuit breaker.

[0017] It includes a base plate 170, which serves as the basic support component for the overall tooling. It is made of 2mm stainless steel plate by laser cutting, with small flatness error. The surface has positioning grooves for each component to ensure that the positioning components on the base plate 170 meet the positioning accuracy standards after welding.

[0018] To facilitate positioning, a rear positioning plate 150 is provided at the rear end of the base plate 170. The rear positioning plate 150 is vertically welded to the rear end of the base plate 170, with its end face perpendicular to the base plate 170, to limit the axial displacement of the main shaft 230. This ensures that the main shaft does not move back and forth during the welding process.

[0019] A left positioning plate 180 is vertically welded to the left side of the base plate 170. The inner plane of the left positioning plate 180 is in contact with the radial reference plane of the main shaft 230 to achieve radial positioning of the main shaft. Together with the rear positioning plate 150, it forms an L-shaped reference positioning structure.

[0020] A horizontal positioning plate 190 is provided on the upper part of the base plate 170. Multiple plates can be provided as needed. In this embodiment, there are two horizontal positioning plates 190. The horizontal positioning plate 190 is attached to the plane of one end of the main shaft 230 to fix the angle of the main shaft and ensure that the main shaft 230 is in a horizontal state during welding.

[0021] The welding fixture for the main shaft 230 includes three parts: crank arm 210, spacer block 220, and main shaft 230.

[0022] A crank arm positioning plate 100 is welded above the base plate 170 at the position where the crank arm 210 is set. Each crank arm positioning plate 100 has a U-shaped positioning groove that matches the shape of the crank arm 210.

[0023] A first groove plate 110 and a second groove plate 160 are welded between adjacent crank arm positioning plates 100.

[0024] A first slot 111 and a second slot 161 matching the size of the spacer block 220 are formed on the inner side of the first slot plate 110 and the second slot plate 160 to limit the radial displacement of the spacer block 220 and ensure that the spacer block 220 is precisely locked between adjacent crank arms 210.

[0025] The clamping device 140 is installed above the first groove plate 110 and the second groove plate 160 respectively. The clamping shaft 230 is fixed by the cylindrical pin 130. The nut 120 is used to fix the spacer block 220 and the crank arm 210 to prevent the spacer block 220 and the crank arm 210 from shifting during welding.

[0026] The parts of this invention are processed by laser cutting and formed into an integral rigid structure by argon arc welding, thus avoiding the impact of assembly gaps on precision.

[0027] The above shows and describes the basic principles, main features, and advantages of this utility model.

[0028] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of this utility model as defined by the appended claims and their equivalents.

Claims

1. A tooling for welding the main shaft of a ring main unit circuit breaker, characterized in that, include: The base plate, which serves as a basic support component, has positioning grooves for each component on its surface to ensure that the positioning components on the base plate meet the required positioning accuracy after welding. A rear positioning plate is provided at the rear end of the base plate to limit the axial displacement of the main shaft; A left positioning plate is vertically welded to the left side of the base plate. The inner plane of the left positioning plate is in contact with the radial reference plane of the main shaft to achieve radial positioning of the main shaft. Together with the rear positioning plate, it forms an L-shaped reference positioning structure. Several horizontal positioning plates are provided on the upper part of the base plate. The horizontal positioning plates are fitted with the plane of one end of the main shaft to fix the angle of the main shaft, so that the main shaft is in a horizontal state during welding. The welding fixture for the main shaft includes three parts: a crank arm, a spacer block, and the main shaft. Several crank arm positioning plates are welded on the upper part of the base plate at the position where the crank arm is set. Each crank arm positioning plate has a U-shaped positioning groove that matches the shape of the crank arm. A first groove plate and a second groove plate are welded between adjacent crank arm positioning plates; A first slot and a second slot, matching the size of the spacer block, are formed on the inner sides of the first slot plate and the second slot plate. The first slot and the second slot are used to limit the radial displacement of the spacer block so that the spacer block is locked between adjacent crank arms. The clamping devices are installed above the first groove plate and the second groove plate respectively, and the clamping shaft is fixed by the cooperation of cylindrical pins. Fasteners are used to fix the spacer block and the crank arm to prevent the spacer block and the crank arm from shifting during welding.

2. The tooling for welding the main shaft of a ring main unit circuit breaker as described in claim 1, characterized in that, The base plate is made of 2mm stainless steel plate by laser cutting.

3. The tooling for welding the main shaft of a ring main unit circuit breaker as described in claim 1, characterized in that, The rear positioning plate is vertically welded to the rear end of the base plate, and the end face of the rear positioning plate is perpendicular to the base plate.

4. The tooling for welding the main shaft of a ring main unit circuit breaker as described in claim 1, characterized in that, The fastener is a threaded fastener.

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