JPH0380330B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method of manufacturing a case for housing electrical equipment such as an oil-immersed transformer.

BACKGROUND ART A case 1 for housing an electrical device includes, for example, a case body 2 having a flange 2a at the upper end, as shown in FIG. After electrical equipment is housed in the case 1, a cover plate (not shown) is attached to the flange 2a. In such a case, if the bottom plate is welded from above the case body, the welding point will be located deep inside the case body, so complete welding work will be performed to prevent liquid leakage. It is difficult to obtain reliable cases. Therefore, when welding the bottom plate 3 to the case body 2, welding 4 is performed from the back side of the bottom plate 3 (from the lower end side of the case body) as shown in the figure.
It is necessary to apply

Therefore, in the conventional method of manufacturing this type of case, after arranging the bottom plate 3 at the lower end of the case body 2 and temporarily fixing the bottom plate 3 to the case body 2 by welding,
The case body was turned over and welding 4 was applied from above to fix the bottom plate 3 to the case body 2. However, this method requires welding to temporarily fix the case body and bottom plate, which increases the number of man-hours, and it is also necessary to manually position the case body relative to the welding position during welding. As a result, the positioning work is time consuming and the manufacturing efficiency is reduced.

OBJECTS OF THE INVENTION An object of the present invention is to provide a method for manufacturing an electrical equipment case that allows the attachment of the bottom plate to the case body to be automatically and efficiently carried out.

Structure of the Invention The present invention is a method for manufacturing an electrical equipment case comprising a case body which is open at both ends and has a flange at the upper end, and a bottom plate provided to close the lower end of the case body. In this case, a support base supporting the case body, a drive shaft that moves in a direction perpendicular to the surface of the support base, a bottom plate holding member provided at the tip of the drive shaft, and a plurality of base plate holding members provided around the drive shaft are provided. a positioning device comprising a case centering fixing member with a groove and a fixing member drive mechanism that drives each of the centering fixing members in a horizontal plane in a direction toward and away from the drive shaft; and a welding device. use Further, a bottom plate positioning portion is formed inside near the lower end of the case body, and the bottom plate is supported by the bottom plate holding member, and the flange is moved to a support stand with the bottom plate positioned inside the case. After performing the work of supporting the case on the support stand by positioning the case on the side, moving the centering fixing member forward toward the case and fitting the flanges of the case into the grooves of each fixing member. The case is positioned and fixed on the support base. Thereafter, inside the case, the drive shaft is moved toward the bottom plate positioning part of the case to bring the bottom plate into contact with the bottom plate positioning part, and then the welding device welds the bottom plate to the case from the outside.

If the case body is first positioned as described above, and then the bottom plate is moved inside the case body toward the bottom plate positioning part of the case and brought into contact with the bottom plate positioning part of the case body, the bottom plate can be moved. The bottom plate can be welded to the case body from the back side without welding to temporarily fix it to the case, reducing the number of man-hours. Further, since the positioning of the case body is automatically performed by the positioning device, it is possible to automate the work of attaching the bottom plate to the case body, and it is possible to efficiently manufacture the electrical equipment case.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

2 and 3 show an embodiment in which a disk-shaped bottom plate 3 is welded to a case body 2 formed in a cylindrical shape. FIG. A plan view showing the positioning of the
FIG. 3 is a sectional view taken along the line -- in FIG. 2.

The positioning device used in the method of the present invention includes a support base 10 on which the case body 2 can be placed and supported. In this embodiment, this support stand 10 is the case body 2.
It is formed in the shape of a flat cylinder with a diameter slightly smaller than that of the flange 2a, and the support base is fixed to the base 11. A drive shaft 12 of a pressing mechanism such as a ram or jack is disposed through the center of the support base 10 so as to be vertically movable. A disk-shaped bottom plate holding member 13 is fixed to the tip of the drive shaft 12,
The outer diameter of the bottom plate holding member 13 is set smaller than the inner diameter of the case body 2. A plurality of centering fixing members 14 and a fixing means driving mechanism 15 for driving the centering fixing members 14 toward and away from the support base are provided around the support base 10. The ejection fixing member 14 consists of a roller having a groove 14a on its outer periphery. The base 11 is provided with a groove 16 that extends long in the direction (radial direction) toward the center O of the drive shaft 12, and the movable member 17 is movable within the groove 16.
A roller constituting the centering fixing member 14 is rotatably supported at 8. The movable member 17 is fixed to the tip of a rod 20 supported movably in the direction toward the center of the drive shaft 12 by a support mechanism 19, and the rod 20 is connected to a drive source (not shown) such as a cylinder and moves toward the center O. It is designed to be able to move back and forth in both directions. In this embodiment, the movable member 1
7, the support mechanism 19, the rod 20, and a drive source (not shown) constitute a fixing means drive mechanism 15 that drives the centering fixing means 14 in the horizontal plane in directions toward and away from the support base 10. and the support stand 10, the drive shaft 12, and the bottom plate holding member 1.
3 constitutes a positioning device.

An automatic welding device equipped with a welding torch 21 is disposed above the support base 10, and this welding device automatically performs welding while the torch 21 moves around the central axis of the drive shaft 12. There is. Furthermore, when attaching and detaching the case body 2 to and from the support stand 10, the torch 21 can be retracted to a predetermined position.

When welding the bottom plate 3 to the case body 2, the bottom plate positioning portion 2b is first formed at the lower end of the case body 2, which has the flange 2a provided at the upper end. In this embodiment, the bottom plate positioning portion 2b is formed by folding the lower end of the case body 2 inward. After forming the bottom plate positioning portion 2b at the lower end of the case body 2 in this manner, the case body 2 is conveyed to the position of the support stand 10 by a conveyance device (not shown) and tipped onto the support stand. Place it. In this case, the bottom plate 3 is positioned above the bottom plate holding member 13 in advance, and the bottom plate 3 is placed on the case body 2.
It is located inside the flange 2a of. Next, each fixed member drive mechanism 15 is operated to move the centering fixed members 14 forward by the same amount of displacement toward the support base 10 at the same time, and the flange 2a of the case body 2 is fitted into the groove 14a on the outer periphery of each fixed member 14. let In this case, each centering fixing member 14 is displaced by the same amount of displacement toward the center of the drive shaft 12, so that the case body is always automatically positioned in a constant positional relationship with respect to the welding device. After positioning and fixing the case body 2 on the support base in this way, the drive shaft 12
is moved upward to bring the bottom plate 3 into contact with the bottom plate positioning portion 2b as shown in FIG. Next, the torch 21 of the welding device is directed from above toward the joint between the bottom plate 3 and the bottom plate positioning portion 2b, and is moved around the central axis of the drive shaft 12 over the entire circumference of the case body 2 and the bottom plate 3. Weld the case body 2
The bottom plate 3 is joined to the bottom plate 3 to complete the case 1. After that, the drive shaft 12 is lowered, and the fixed member drive mechanism 15
After releasing the fixation of the case body 2 by moving each centering fixing member 14 backward, the case 1 is carried out by a conveying device (not shown).

In the above embodiment, the case body 2 was formed in a cylindrical shape, but as shown in FIG. The present invention can be similarly applied to welding. In this case, two centering fixing members 14 are provided for each long side of the cross section of the case body, and one centering fixing member 14 is provided for each short side. Note that the number of centering fixing members can be increased or decreased as appropriate depending on the shape of the case body. The configuration of the fixing member drive mechanism 15 that drives each centering fixing member 14 is the same as that in the above example. Further, in this embodiment, the support base is configured to have a substantially rectangular cross section in accordance with the cross-sectional shape of the case body 2.

In the above embodiment, the bottom plate holding member 13 is formed into a plate shape, but this holding member may be any member that can hold the bottom plate 3, and does not necessarily need to be formed into a plate shape. For example, the bottom plate holding member may be configured by a plurality of rod-shaped members arranged to intersect on a horizontal plane. Further, the centering fixing member 14 only needs to have a groove into which the flange of the case body fits, and does not necessarily have to be in the shape of a roller. For example, a block-shaped member provided with grooves may be used as the centering fixing member.

Further, in the above embodiment, the support base is positioned horizontally, but if an electromagnet or a permanent magnet is used to magnetically support the bottom plate on the bottom plate holding member, the support base can be placed in a position other than horizontal, for example, in a vertical position. It can also be placed in

Effects of the Invention As described above, according to the present invention, the case body is first positioned, and then the bottom plate is moved upward inside the case body and brought into contact with the bottom plate positioning portion of the case body. The bottom plate can be welded to the case body from the outside without performing welding to temporarily fix the bottom plate to the case, and the number of man-hours can be reduced. Further, since the positioning of the case body is automatically performed by the positioning device, it is possible to automate the work of attaching the bottom plate to the case body, and it is possible to efficiently manufacture the electrical equipment case.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of a case manufactured by the method of the present invention, FIG. 2 is a plan view showing an example of the configuration of an apparatus for carrying out the present invention, and FIG. 3 is a cross-sectional view taken along the - line in FIG. FIG. 4 is a plan view showing another example of the configuration of an apparatus for carrying out the present invention. 1...Case, 2...Case body, 2a...Flange, 2b...Bottom plate positioning part, 3...Bottom plate,
DESCRIPTION OF SYMBOLS 10... Support stand, 11... Base, 12... Drive shaft, 13... Bottom plate holding member, 14... Centering fixing member, 15... Fixing member drive mechanism.

Claims (1)

[Claims] 1. A method for manufacturing an electrical equipment case consisting of a case body which is open at both ends and has a flange at the upper end, and a bottom plate provided to close the lower end of the case body, comprising: a support base for supporting the case body; A drive shaft that moves in a direction perpendicular to the surface of the support base, a bottom plate holding member provided at the tip of the drive shaft, and a case centering fixing member with a plurality of grooves provided around the drive shaft. A positioning device including a fixing member drive mechanism that drives each of the centering fixing members toward and away from the drive shaft in a horizontal plane, and a welding device are provided, A bottom plate positioning part is formed inside the case, and the bottom plate is supported by the bottom plate holding member, and with the bottom plate positioned inside the case, the flange is positioned on the support stand side, and the case is opened. and positioning the case on the support base by moving the centering fixing member toward the case and fitting the flanges of the case into the grooves of each fixation member. Then, inside the case, move the drive shaft toward the bottom plate positioning part of the case to bring the bottom plate into contact with the bottom plate positioning part, and then use the welding device to attach the bottom plate to the case from the outside. A method for manufacturing an electrical equipment case, characterized by welding.