Fixing frame of draw-out type circuit breaker

Abstract

To provide a fixing frame of a drawer type circuit breaker in which there is no variation in the thickness of a plating film, the time required for a plating process is uniform, and which can be processed easily at low cost.SOLUTION: The fixed frame 100 of the drawer-type circuit breaker includes a pair of fixed frame side plates 10, a bottom plate 20 fixed at both ends between the lower ends of the pair of fixed frame side plates 10, and a back plate 30 fixed between the rear ends of the pair of fixed frame side plates 10, wherein the fixed frame side plates 10 have first folded portions 10U bent by 90 degrees toward the bottom plate 20 at lower end portions thereof, the bottom plate 20 has a second folding-back part 20G with both ends on the fixed frame side plate 10 side bent upward, and the pair of fixed frame side plates 10 and the bottom plate 20 are fixed via independent reinforcing plates 12, 13 with the first folding-back part 10U and the second folding-back part 20G having an L-shaped cross section cut vertically to the longitudinal direction Y.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a fixing frame for a draw-out type circuit breaker. [Background technology]

[0002] Conventionally, a fixed frame for a draw-out type circuit breaker has been proposed that includes a floor plate having a pair of fixed frame rails on both the left and right sides for placing the draw-out type vacuum circuit breaker and guiding its movement in the forward and backward directions, a main circuit terminal that can be attached and detached to the terminal of the vacuum circuit breaker, and a pair of side plates that insulate and support the main circuit terminal, and at the connection position where the vacuum circuit breaker is connected to the main circuit terminal, an engagement hole that engages with an interlock pin provided on the vacuum circuit breaker is formed at a position eccentric from the left and right center line of the floor plate, and a guide protrusion that prevents the vacuum circuit breaker from rotating horizontally around the interlock pin is provided on the fixed frame rail (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-27195 Summary of the Invention [Problem to be solved by the invention]

[0004] In the past, the reinforcing plate for the rails that guide the wheels on the side panels of the fixed frame was bent in an L shape, and the side panels of the fixed frame were supported by a single plate. However, during the plating process, the L-shaped bent part of the reinforcing plate was tall, which hindered the electricity from the electrode, making it difficult to plate, which resulted in variations in the thickness of the plating film and affected the time required for the plating process.

[0005] The L-shaped bending of the reinforcing plates for the side panels of the fixed frame is a processing method that integrates punching and bending, and while it can accommodate complex shapes, there were issues with the time required to increase precision, which led to higher costs. Another issue was that each side panel was large, making it difficult to process.

[0006] The present disclosure discloses a technique for solving the above-described problems, and aims to provide a fixing frame for a draw-out type circuit breaker that is free from variation in thickness of the plating film, requires a uniform time for the plating process, and can be easily processed at low cost. [Means for solving the problem]

[0007] The fixing frame of the draw-out type circuit breaker according to the present disclosure includes: A plated draw-out type circuit breaker fixing frame that accommodates a circuit breaker so that the circuit breaker can be moved forward and backward, the fixed frame includes a pair of fixed frame side plates, a bottom plate having both ends fixed between lower ends of the pair of fixed frame side plates, and a back plate fixed between rear ends of the pair of fixed frame side plates, The fixed frame side panel has a first folded portion at a lower end thereof that is folded 90 degrees toward the bottom panel, the bottom plate has second folded portions at both ends on the side of the fixing frame side plate that are bent upward, The pair of fixed frame side panels and the bottom panel are fixed together by means of independent reinforcing plates whose cross sections, cut perpendicular to the longitudinal direction, are L-shaped, with the first folded portion and the second folded portion interposed therebetween. [Effects of the Invention]

[0008] According to the fixing frame for a draw-out type circuit breaker according to the present disclosure, it is possible to provide a fixing frame for a draw-out type circuit breaker in which there is no variation in the thickness of the plating coating, the time required for the plating process is uniform, and further, it is possible to provide a fixing frame for a draw-out type circuit breaker that can be easily processed at low cost. [Brief explanation of the drawings]

[0009] [Figure 1]FIG. 2 is a perspective view of a fixing frame of the draw-out type circuit breaker according to the first embodiment. [Figure 2] Fig. 2A is a perspective view of a first guide reinforcing plate according to embodiment 1. Fig. 2B is a perspective view of a second guide reinforcing plate according to embodiment 1. Fig. 2C is a perspective view of a fixing frame side plate according to embodiment 1. [Figure 3] Fig. 3A is a perspective view of a fixed frame side plate according to embodiment 1. Fig. 3B is an enlarged view of a main part of the portion surrounded by a dashed line in Fig. 3A. [Figure 4] Fig. 4A is a perspective view of a fixed frame side plate of a comparative example, and Fig. 4B is an enlarged view of a main part of the area surrounded by a dashed line in Fig. 4A. [Figure 5] 2 is an enlarged front view of a main part showing a state in which a draw-out type circuit breaker is placed on a fixing frame according to the first embodiment. FIG. [Figure 6] Fig. 6A is a cross-sectional view showing a method for fixing the bottom plate and the side plates of the fixed frame according to embodiment 1. Fig. 6B is an enlarged view of a main part of the area surrounded by a dashed line in Fig. 6A. [Figure 7] 5A to 5C are schematic diagrams showing an electroplating process applied to the fixed frame side plate according to the first embodiment. [Figure 8] Fig. 8A is a front view of a fixed frame side plate of a comparative example, and Fig. 8B is an enlarged view of a main part of the area surrounded by a dashed line in Fig. 8A. DETAILED DESCRIPTION OF THE INVENTION

[0010] Embodiment 1 The fixing frame of the draw-out type circuit breaker according to the first embodiment will be described with reference to the drawings. FIG. 1 is a perspective view of a fixed frame 100 of a draw-out type circuit breaker according to a first embodiment. FIG. 2A is a perspective view of a first guide reinforcing plate. FIG. 2B is a perspective view of the second guide reinforcing plate. FIG. 2C is a perspective view of the fixed frame side plate. FIG. 3A is a perspective view of a fixed frame side plate. FIG. 3B is an enlarged view of the main part of the portion enclosed by the dashed line in FIG. 3A. FIG. 4A is a perspective view of a fixed frame side plate of a comparative example. FIG. 4B is an enlarged view of the main part of the portion enclosed by the dashed line in FIG. 4A. FIG. 5 is an enlarged front view of a main part showing a state in which the draw-out type circuit breaker is placed on the fixing frame.

[0011] The vertical direction in Figure 1 is the Z direction, the horizontal direction is the X direction, and the depth direction is the Y direction. The Y direction is the direction in which the circuit breaker is retracted or pulled out. The fixed frame 100 of the draw-out type circuit breaker (hereinafter simply referred to as the fixed frame 100) is a framework that houses a circuit breaker (not shown) that cuts off the power supply so that it can move in the front-to-rear direction. The fixed frame 100 is manufactured by assembling a pair of fixed frame side plates 10, a bottom plate 20 whose both ends are fixed between the lower ends of the pair of fixed frame side plates 10, and a back plate 30 connected and fixed between the rear ends of the pair of fixed frame side plates 10.

[0012] First, differences between fixed frame side panel 10 according to embodiment 1 shown in FIGS. 3A and 3B and fixed frame side panel 10B of the comparative example shown in FIG. 4 will be described. 4A and 4B, the fixed frame side panel 10B of the comparative example has a first folded portion 10BU at its lower end in the Z direction that is folded 90 degrees toward the bottom panel. A portion of the first folded portion 10BU itself, excluding one side of the rectangle, is punched out and then bent vertically in an L shape to form a first guide reinforcing plate 12B, and similarly a second guide reinforcing plate 13B. The first guide reinforcing plate 12B and the second guide reinforcing plate 13B are provided to fix and reinforce the bottom panel, which has wheel guides for guiding the wheels of a circuit breaker (not shown).

[0013] 1 to 3A and 3B of embodiment 1 has a first folded portion 10U at its lower end in the Z direction that is folded 90 degrees toward the bottom plate 20. A first guide reinforcing plate 12 and a second guide reinforcing plate 13, which are formed as separate parts from the fixed frame side plate 10, are joined to first folded portion 10U with rivets R. First guide reinforcing plate 12 and second guide reinforcing plate 13 (reinforcing plates) are independent plates each having an L-shaped cross section cut perpendicular to the longitudinal direction (Y direction).

[0014] The first guide reinforcing plate 12 and the second guide reinforcing plate 13 are provided to fix and reinforce the bottom plate 20 having the wheel guide G for guiding the wheel TR of the circuit breaker 50 shown in Figure 5.

[0015] Fixed frame side plate 10B of the comparative example is made up of a single plate including first guide reinforcing plate 12B and second guide reinforcing plate 13, whereas fixed frame side plate 10, first guide reinforcing plate 12, and second guide reinforcing plate 13 of embodiment 1 are made up of three separate plates. Fixed frame side plate 10 is joined to first guide reinforcing plate 12 and second guide reinforcing plate 13 by rivets, as shown in FIG. 3 .

[0016] Next, the bottom plate 20 will be described. 1 and 5, wheel guides G (second folded portions) extending in the Y direction are formed three-dimensionally at both ends in the X direction of the bottom plate 20. The wheel guides G have a rail portion G1 that rises in the Z direction so that the wheels TR of the circuit breaker 50 can move in the Y direction along the rail portion G1, a fixing portion G2 that extends outward in the X direction from the upper end of the rail portion G1 and further rises in the Z direction along the first guide reinforcing plate 12 and the second guide reinforcing plate 13, and a protective portion G3 that is folded back from the end of the fixing portion G2 above the wheels TR toward the inside in the X direction to above the wheels TR. In this way, the wheel guide G has a U-shaped cross section cut perpendicular to the longitudinal direction (Y direction) that is recessed outward in the X direction of the bottom plate 20.

[0017] The bottom plate 20 and the fixed frame side plate 10 are fixed with rivets R via the first guide reinforcement plate 12 and the second guide reinforcement plate 13, using holes provided in the fixed portion G2 and holes provided in the first guide reinforcement plate 12 and the second guide reinforcement plate 13.

[0018] FIG. 6A is a cross-sectional view showing a method for fixing the bottom plate 20 and the fixed frame side plate 10. As shown in FIG. FIG. 6B is an enlarged view of the main part of the portion enclosed by the dashed line in FIG. 6A. The portion of the wheel guide G shown in Fig. 6B indicated by the dashed line H is provided with an elongated positioning hole H1 that penetrates in the Z direction, and the plate-shaped positioning portion 10S of the fixed frame side plate 10 shown in Fig. 3B is fitted into this positioning hole H1 to engage and position the fixed frame side plate 10 and the bottom plate 20. The positioning portion 10S is also fixed to the bottom plate 20 with a rivet.

[0019] Note that the positioning portion 10S does not have a divided structure, but is formed by bending an L-shape from the first folded portion 10U of the fixed frame side panel 10, because the purpose of the positioning portion 10S is to position and engage the fixed frame side panel 10 and the bottom panel 20. In other words, the positioning portion 10S is a part of the first folded portion 10U.

[0020] In this way, both ends of the bottom plate 20 in the X direction are bent into a U-shape to form wheel guides G, which serve to place the drawer-type circuit breaker 50 and guide its movement in the Y direction, as well as to prevent movement in the X direction. In addition, the first guide reinforcing plate 12 and the second guide reinforcing plate 13 are riveted to the bottom plate 20, which serves as a guide for the wheels TR, and thus serve to reinforce the fixed frame 100.

[0021] In addition, the first guide reinforcing plate 12 and the second guide reinforcing plate 13 are fixed to the bottom plate 20 in the gap inside the wheel guide G, so that the rivets R are prevented from being exposed. This prevents the rivets R from affecting the function of the fixed frame side plate 10.

[0022] Next, the plating process for the fixed frame side panel 10 will be described. FIG. 7 is a schematic diagram showing the electroplating process performed on the fixed frame side panel 10. As shown in FIG. FIG. 8A is a front view of a fixed frame side plate of a comparative example. FIG. 8B is an enlarged view of the main part of the portion enclosed by the dashed line in FIG. 8A. Electroplating forms a film using an electric current. As shown in Figure 7, two electrodes are connected via an external power source: the side panel of the fixed frame on the cathode side and zinc on the anode side. Electrical energy is applied from the power source, causing a reduction reaction at the cathode. During this reaction, zinc ions move to the cathode side, receive electrons at the cathode interface, and are deposited as metal.

[0023] For example, when attempting to plate the comparative example fixed frame side panel 10B shown in Figures 4A, 8A, and 8B, the first guide reinforcing plate 12 and the second guide reinforcing plate 13, which are raised by L-shaped bending as shown by circle C in Figure 8B, obstruct the flow of electricity, resulting in variations in the locations that become high-voltage areas and low-voltage areas.

[0024] Therefore, between the first guide reinforcing plate 12B and the second guide reinforcing plate 13B and the fixed frame side panel main body 11B, the plating layer thickness varies, with the plating layer being thinner on the lower side and thicker on the upper side. Note that the larger the area of ​​the opposing surfaces, the more susceptible to this effect.

[0025] Therefore, in the first embodiment, the first guide reinforcing plate 12 and the second guide reinforcing plate 13, which have a relatively large opposing area, are separated from the fixed frame side plate 10 and plated individually.

[0026] According to the fixed frame 100 of the draw-out type circuit breaker of embodiment 1, it is possible to individually electroplating the fixed frame side plate 10, the first guide reinforcing plate 12, and the second guide reinforcing plate 13, so there is no need to consider the raised portions that obstruct the flow of electricity as shown in Figure 8, and variations in the thickness of the plating film and the plating time due to variations in current density are significantly reduced.

[0027] Furthermore, the L-shaped bending process for the first guide reinforcement plate 12 and the second guide reinforcement plate 13 of the fixed frame side panel in the comparative example was a process that integrated punching and bending, which was a time-consuming and cost-intensive process. However, by improving this to a simpler method in which the wheel guide G of the fixed frame side panel, which has the largest raised area, is provided on the bottom plate 20 and the bottom plate 20 is riveted to the first guide reinforcement plate 12 and the second guide reinforcement plate 13, it is possible to improve the efficiency and reduce the cost of the assembly process for the fixed frame 100.

[0028] Although the present disclosure describes exemplary embodiments, the various features, aspects, and functions described in the embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations.

[0029] Therefore, countless variations not illustrated are contemplated within the scope of the technology disclosed in this specification, including, for example, modifying, adding, or omitting at least one component.

[0030] Various aspects of the present disclosure are summarized below as appendices.

[0031] (Appendix 1) A plated draw-out type circuit breaker fixing frame that accommodates a circuit breaker so that the circuit breaker can be moved forward and backward, the fixed frame includes a pair of fixed frame side plates, a bottom plate having both ends fixed between lower ends of the pair of fixed frame side plates, and a back plate fixed between rear ends of the pair of fixed frame side plates, The fixed frame side panel has a first folded portion at a lower end thereof that is folded 90 degrees toward the bottom panel, the bottom plate has second folded portions at both ends on the side of the fixing frame side plate that are bent upward, The pair of fixing frame side plates and the bottom plate are a fixing frame of a draw-out type circuit breaker in which the first folded portion and the second folded portion are fixed via independent reinforcing plates whose cross section, cut perpendicular to the longitudinal direction, is L-shaped. (Appendix 2) The fixed frame of the draw-out type circuit breaker according to Appendix 1, wherein the second folded portion is a wheel guide that guides the wheels of the circuit breaker in the front-rear direction. (Appendix 3) The fixing frame of the draw-out type circuit breaker according to Appendix 2, wherein the cross section of the wheel guide cut perpendicular to the longitudinal direction is U-shaped and recessed toward the outside of the bottom plate. (Appendix 4) 4. A fixing frame for a draw-out type circuit breaker according to any one of Supplementary Note 1 to Supplementary Note 3, wherein a plurality of the reinforcing plates are fixed to one of the first folded portions and one of the second folded portions. (Appendix 5) the first folded portion has a positioning portion formed by bending a part of the first folded portion upward, 5. The fixing frame of a draw-out type circuit breaker according to any one of Supplementary Note 1 to Supplementary Note 4, wherein the second folded portion has a positioning hole that fits into the positioning portion. (Appendix 6) 6. The fixed frame of a draw-out type circuit breaker according to any one of Supplementary Note 1 to Supplementary Note 5, wherein the pair of fixed frame side plates and the bottom plate are fixed with rivets. (Appendix 7) 7. The fixing frame of a draw-out type circuit breaker according to claim 1, wherein the fixing frame side plate and the reinforcing plate are individually plated. [Explanation of symbols]

[0032] 100 fixed frame, 10, 10B fixed frame side plate, 10S positioning part, 10U,10BU 1st folding part, 11B fixed frame side plate body, 12, 12B: first guide reinforcing plate; 13, 13B: second guide reinforcing plate; 20: bottom plate; 30 Back plate, 50 Circuit breaker, C Circle mark, G Wheel guide, G1 Rail part, G2 fixed part, G3 protection part, H broken line, H1 positioning hole, TR wheel, R rivet.

Claims

1. A plated draw-out type circuit breaker fixing frame that accommodates a circuit breaker so that the circuit breaker can be moved forward and backward, the fixed frame includes a pair of fixed frame side plates, a bottom plate having both ends fixed between lower ends of the pair of fixed frame side plates, and a back plate fixed between rear ends of the pair of fixed frame side plates, the fixed frame side panel has a first folded portion at a lower end thereof that is folded 90 degrees toward the bottom panel, the bottom plate has second folded portions at both ends on the side of the fixing frame side plate, A pair of the fixing frame side plates and the bottom plate are fixed to the fixing frame of a draw-out type circuit breaker via independent reinforcing plates whose cross sections, cut perpendicular to the longitudinal direction, are L-shaped, and the first folded portion and the second folded portion are fixed to the fixing frame.

2. 2. The fixed frame for a draw-out type circuit breaker according to claim 1, wherein the second folded portion is a wheel guide that guides a wheel of the circuit breaker in the front-rear direction.

3. 3. The fixing frame for a draw-out type circuit breaker according to claim 2, wherein the cross section of said wheel guide taken perpendicular to the longitudinal direction is U-shaped and recessed toward the outside of said bottom plate.

4. 2. The fixed frame for a draw-out type circuit breaker according to claim 1, wherein a plurality of said reinforcing plates are fixed to one of said first folded portion and one of said second folded portion.

5. the first folded portion has a positioning portion formed by bending a part of the first folded portion upward, The fixing frame for a draw-out type circuit breaker according to claim 1 , wherein the second folded portion has a positioning hole that fits into the positioning portion.

6. 2. The fixed frame for a draw-out type circuit breaker according to claim 1, wherein the pair of fixed frame side plates and the bottom plate are fixed together with rivets.

7. 7. The fixing frame for a draw-out type circuit breaker according to claim 1, wherein the fixing frame side plate and the reinforcing plate are plated separately.

Images