JPH04340307A - Aseismatic enclosed switchboard - Google Patents

Abstract

PURPOSE:To manufacture a product easy in assembling and wiring by constituting the frame of a box out of angle steels, and welding steel plates, where the central parts are punched largely in front, rear, right, and left each face of the box, to the frame of the box. CONSTITUTION:The frame 3 of a box is constituted by welding or screwing up angle steels vertically or horizontally. Next, steel plates 2, where the central parts are punched largely, are welded and fixed to front, rear, right, and left each face of the frame 3. Hereby, time oblique X material for reinforcement can be dispensed with, and the mounting of circuit parts and the wiring can be made efficient.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in the rigid structure of an earthquake-resistant closed switchboard.

0002

[Prior Art] As is well known, an earthquake-resistant closed power distribution board is constructed by housing electrical circuit components such as main circuit equipment for opening/closing and protection of loads such as emergency lighting, monitoring and control equipment, etc. in a closed box. It is.

By the way, an earthquake-resistant closed switchboard needs to have a high natural frequency and be sufficiently isolated from earthquake frequency components.
Must have a rigid structure. Conventionally, as shown in FIG. 3, the framework of the closed box is constructed of angle iron 11, and reinforcing members 1 made of angle iron are provided in an X-shape on both sides and the back.
2 are welded to form a rigid frame structure, and a cover is screwed to this frame structure or a door is attached via a hinge to form a closed box.

0004

[Problems to be Solved by the Invention] However, with the method of using the reinforcing member 12 as shown in FIG. 3, it is not possible to reinforce the surface where the operating parts etc. are placed, especially the front surface, and it is not possible to create a sufficiently rigid structure. In addition, there is a problem in that the reinforcing member 12 inserted in the X-shape becomes an obstacle during assembly of the distribution box, wiring work, etc., and reduces work efficiency.

Furthermore, when a dust filter is attached to the inside of a ventilation hole provided in a cover, there is a problem in that it is difficult to insert an X-shaped reinforcing member.

[0006] Conventionally, it has also been proposed to provide a rigid structure by welding a cover to a frame made of angle iron, but this method also has problems in terms of the rigid structure of the front surface, workability of assembly and wiring work, etc. There was a problem similar to the conventional example shown in FIG.

[0007]

[Means for Solving the Problems] The present invention provides an earthquake-resistant closed power distribution board in which electrical components are housed in a closed box having a rigid structure, in which the framework of the closed box is made of angle iron, and both sides and the front By welding a punched steel plate with a large hole in the center to the angle iron on the back, it is possible to provide a rigid structure even on the front where operating parts are placed.
It is an object of the present invention to provide an earthquake-resistant closed power distribution board that is also easy to assemble and wire.

[0008]

[Operation] The framework of the closing box is made of angle iron, and by welding a steel plate with a large punch in the center to the angle iron, the wall thickness and side dimensions of the angle iron are substantially increased, and the section modulus is increased. This results in an increase in the number of parts, which gives it a rigid structure.

[0009] Therefore, even on the front side of the framework of the closed box, it is possible to provide a rigid structure without hindering the installation and operation of operating parts, and by adjusting the punching dimensions of the central part of the punched steel plate. , a rigid structure can be provided without reducing the workability of assembly and wiring work.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below using examples shown in the drawings. FIG. 1 is a perspective view showing an embodiment of the present invention,
Only the framework is illustrated. The framework is constructed using an angle iron 1, and punched steel plates 2 having an octagonal shape punched out at the center are welded to the inside of the angle iron 1 on both sides and the front and back surfaces. A closed box is completed by screwing both side covers, a back cover, and a ceiling cover to this frame, and attaching a door to the front via a hinge.

Even if the punched steel plate 2 is welded to the angle iron 1 to provide a rigid structure on the front, rear, and both sides of the framework, the central part of the punched steel plate 2 is wide open.
There are no problems with its operability. Also, since the center part is wide open for assembly and wiring work, compared to the conventional example shown in Figure 3,
It has the advantage of being easy to do.

[0012] Furthermore, even in a structure in which a ventilation hole is provided in the side cover or the like and a dustproof filter or the like is installed inside the side cover, the dustproof filter may be placed in the punched part in the center of the punched steel plate 2, and the switchboard A rigid structure can be realized without hindering ventilation.

It should be noted that the punched shape of the central part of the punched steel plate 2 may be a hexagonal shape as shown in FIG. 2, in addition to the octagonal shape shown in the embodiment, or other shapes. Needless to say. However, the octagonal and hexagonal shapes shown in the embodiments are preferable in consideration of the dispersion of vibration energy and the ease of assembly and wiring work.

Furthermore, the present invention is not limited to the above-mentioned embodiments, but can also be applied to, for example, two frameworks as shown in FIG. In that case, it is preferable to weld the punched steel plate also to the angle iron provided at the intermediate portion in the width direction or front-back direction.

[0015]

[Effects of the Invention] As described above, according to the present invention, it is possible to provide a rigid structure even on the surface where operating parts etc. are placed, especially the front part, and it is also possible to improve the workability of assembly and wiring work. It can provide excellent advantages such as:

[Brief explanation of the drawing]

[Fig. 1] A perspective view showing one embodiment of the framework of an earthquake-resistant closed switchboard according to the present invention.

[Fig. 2] A front view showing another embodiment of a punched steel plate used in an earthquake-resistant closed switchboard of the present invention.

[Fig. 3] A perspective view showing an example of the framework of a conventional earthquake-resistant closed switchboard.

[Explanation of symbols]

1　Angle steel 2　Punched steel plate

Claims (1)

[Claims] Claim 1: An earthquake-resistant closed switchboard in which electrical components are housed in a closed box having a rigid structure, wherein the framework of the closed box is made of angle iron, and both sides and the front and back portions are integrally formed with the angle iron. An earthquake-resistant closed power distribution board characterized by welding a punched steel plate to the top.