JPH05335165A - Manufacture of electric equipment tank - Google Patents

Abstract

PURPOSE:To enable the base plate of a tank to be automatically and efficiency positioned and welded to the side plate of the tank in an electric equipment tank manufacturing method. CONSTITUTION:A tank side plate 2 is kept making a flange 2A face downward, a base plate 3 is placed at an optional position inside the tank side plate 2 and held on a frame 4, and a base plate positioning piece 6A is made to move downward so as to bear against the lower end 2B of the tank side plate 2. Thereafter, the base plate 3 is pushed up by a base plate holding piece 5A, the base plate 3 is pinched between the pieces 6A and 5A, in succession a movable clamping jig 7B is made to move sideways to clamp and temporarily fixed the tank side plate 2 and the tank base plate 3 together with a fixed clamping jig 7A. Thereafter, the base plate holding piece 5A and the base plate positioning piece 6A are made to recede to a prescribed station, and then the base plate 3 is welded to the tank side plate 2 from above by a welder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a tank for housing electric equipment such as an oil-filled transformer.

[0002]

2. Description of the Related Art A tank 1 for accommodating electric equipment includes a tank shell plate 2 having a flange 2A at its upper end and a bottom plate 3 attached by welding so as to close a lower end 2B of the tank shell plate 2 as shown in FIG. A cover plate (not shown) is attached to the flange 2A after the electric device is housed in the tank 1. In the conventional method of manufacturing such a tank 1,
A method for forming a bottom plate positioning position near the lower end 2B of the tank body plate 2 by pressing in advance and disposing the bottom plate 3 inside the tank body plate 2 and abutting the bottom plate 3 at the positioning position, or inside the tank body plate 2 The bottom plate 3 is arranged and the lower end 2 of the tank body plate 2 is arranged.
After positioning the bottom plate 3 by attaching a simple positioning bracket to the B side and adjusting the position from above, and temporarily fixing the joint parts of the tank body plate 2 and the bottom plate 3 at several places by temporary welding,
The bottom plate 3 was fixed to the tank body plate 2 by performing main welding manually from the outside.

[0003]

However, according to such a method, the press working for forming the bottom plate positioning position on the tank body plate 2 or the welding work for temporarily fixing the tank body plate 2 and the bottom plate 3 is performed. Since it takes a lot of man-hours and the main welding work for fixing the bottom plate 3 is performed manually, the man-hours are required for the main welding work and the manufacturing processing cost cannot be reduced. Further, since the positioning of the tank body plate 2 and the bottom plate 3 is temporarily fixed by welding, the welding conditions of the temporarily fixed portion and other portions may be different during the main welding, and a welding defect may occur. Therefore, the present invention enables the bottom plate 3 to be attached to the tank body plate 2 automatically and efficiently.

[0004]

According to the present invention, there is provided an electric device comprising a tank shell plate 2 having both ends open and a flange 2A at the upper end, and a bottom plate 3 provided so as to close a lower end 2B of the tank shell plate 2. A method for manufacturing a tank, comprising: a gantry (4) holding a tank body plate (2), a lower drive shaft (5) moving in a direction perpendicular to the lower surface of the gantry (4), and a bottom plate provided at the tip of the lower drive shaft (5). A holding metal fitting 5A, an upper drive shaft 6 which moves in a direction perpendicular to the surface of the gantry 4, a bottom plate positioning metal fitting 6A provided at the tip of the upper drive shaft 6, and a horizontal direction relative to the surface of the gantry 4. A positioning device and a welding device equipped with a moving horizontal driving shaft 7, a movable tightening jig 7B provided at the tip of the horizontal driving shaft 7, and a fixed tightening jig 7A provided opposite to the movable tightening jig 7B. To use. The tank body plate 2 is in a state in which the flange 2A surface side faces downward,
The bottom plate 3 is placed at an arbitrary position inside the tank body plate 2 and is held by the rear mount 4. After that, the upper drive shaft 6 is moved from the upper part to the lower part, and the bottom plate positioning fitting 6A is attached to the tank body plate 2.
The lower drive shaft 5 from the lower part to the upper part to push up the bottom plate 3 with the bottom plate holding metal fitting 5A,
It is sandwiched with the bottom plate positioning metal fitting 6A and temporarily fixed. After that, the lateral drive shaft 7 is moved in the direction of the tank body plate 2, and the tank body plate 2 and the bottom plate 3 are temporarily fixed by tightening the movable tightening jig 7B and the fixed tightening jig 7A. After that, the lower drive shaft 5 and the upper drive shaft 6 are moved to retract the bottom plate holding metal fittings 5A and the bottom plate positioning metal fittings 6A to predetermined positions, and then the bottom plate 3 is fixed to the tank body plate 2 by welding from above.

[0005]

After the tank body plate 2 is held on the mount 4 as described above, the bottom plate 3 is moved to the bottom plate positioning portion inside the tank body plate 2 to move the movable tightening jig 7B and the fixed tightening jig 7A.
If it is tightened and temporarily fixed, the bottom plate 3 can be directly main-welded to the tank body plate 2 directly from above without performing temporary welding for temporarily fixing the bottom plate 3 to the tank body plate 2. The man-hours can be reduced. Further, since the positioning of the tank body plate 2 is automatically performed by the positioning device, the work of attaching the bottom plate 3 to the tank body plate 2 can be automated and can be performed efficiently. Further, since the temporary fixing of the tank body plate 2 and the bottom plate 3 which is performed by the temporary welding is unnecessary, the welding conditions at the time of the main welding are almost the same and the welding defects can be reduced.

[0006]

Embodiments of the present invention will be described below with reference to FIGS. 2 and 3 show an embodiment in which a disc-shaped bottom plate 3 is welded to a tank body plate 2 formed in a cylindrical shape, and FIG. 2 shows the tank body plate 2 in the method of the present invention.
FIG. 3 is a plan view showing a state in which the is positioned, and FIG.
FIG. The positioning device used in the method of the present invention comprises a pedestal 4 on which the tank shell 2 can be placed and held. A hole smaller than the outer diameter of the tank body plate 2 is formed at substantially the center of this gantry 4, and a vertically movable lower drive shaft 5 is arranged at the center thereof. A disk-shaped bottom plate holding fitting 5A is fixed to the tip of the lower drive shaft 5, and the outer diameter of the bottom plate holding fitting 5A is set to be smaller than the inner diameter of the tank body plate 2. Further, an upper drive shaft 6 which is held by a column 4A and is vertically movable is arranged above the gantry 4. A disc-shaped bottom plate positioning member 6A is fixed to the tip of the upper drive shaft 6, and the bottom plate positioning member 6A is formed with a disc smaller than the inner diameter of the tank body plate 2 and a disc larger than the outer shape of the tank body plate 2 with a step. ing. Further, a lateral drive shaft 7 which is movable left and right is arranged substantially in the center of the column 4A of the gantry 4. At the tip of the lateral drive shaft 7, a movable tightening jig 7B, which is divided into two parts having substantially the same diameter as the outer diameter of the tank body plate 2, is fixed. A fixed tightening jig 7A having the same shape is arranged on the side opposite to the movable tightening jig 7B. In this embodiment, a positioning device is constituted by the gantry 4, the lower drive shaft 5 and the bottom plate holding fitting 5A, the upper drive shaft 6 and the bottom plate positioning fitting 6A, the lateral drive shaft 7, the movable tightening jig 7B and the fixed tightening jig 7A. It is configured. A welding torch 8 is provided above the gantry 4.
An automatic welding device (not shown) equipped with a welding torch 8 is provided in the tank body plate-bottom plate tangential portion 2 of the automatic welding device.
Welding is performed automatically while moving along C. Also, when attaching or detaching the tank body plate 2 to or from the mount 4,
The welding torch 8 can be retracted to a predetermined position. In the present embodiment, first, the tank body plate 2 formed into a cylindrical shape is placed in a state in which the surface of the flange 2A faces downward, and then the bottom plate 3 is arranged at an arbitrary position inside the tank body plate 2. After that, the tank shell plate 2 is transported to the position of the gantry 4 by a transport device (not shown) and placed on the gantry 4, and the outer side of the tank shell plate 2 is brought into contact with the fixed tightening jig 7A. After that, the upper drive shaft 6 is moved downward to move the lower end 2B of the tank body plate 2
The bottom plate positioning fitting 6A is brought into contact with. In this case, a disk portion of the bottom plate positioning member 6A that is larger than the outer diameter of the tank shell plate 2 contacts the lower end 2B of the tank shell plate, and a disk portion that is smaller than the inner diameter of the tank shell plate 2 enters the inside of the tank shell plate 2. The thickness of the step portion that enters the inside is the lower end 2B of the tank body plate 2
The positioning dimension up to the bottom plate 3 is obtained. Next, the lower drive shaft 5 is moved upward. At this time, the bottom plate holding metal fitting 5A fixed to the tip of the lower drive shaft 5 pushes up the bottom plate 3 arranged at an arbitrary position inside the tank body plate 2, and the bottom plate 3 is placed on the small disk portion of the bottom plate positioning metal fitting 6A. Abut,
The position of the bottom plate 3 is determined. Next, the lateral drive shaft 7 is moved in the direction of the tank shell plate 2, and the tank shell plate 2 is tightened by the fixed tightening jig 7A and the movable tightening jig 7B to temporarily fix the bottom plate 3. In this case, since the movable tightening jig 7B moves toward the tank shell plate 2 and comes into contact with the tank shell plate 2 to stop, the tank shell plate 2 is automatically kept in a fixed positional relationship with the automatic welding device. Positioned. Next, after temporary fixing, the lower drive shaft 5 and the upper drive shaft 6 are moved to retract the bottom plate holding metal fitting 5A and the bottom plate positioning metal fitting 6A to predetermined positions. Next, the welding torch 8 of the automatic welding device is directed from above to the joint between the bottom plate 3 and the bottom plate positioning portion, and is moved along the tangent portion 2C of the tank body plate-bottom plate to weld the tank body plate 2 and the bottom plate 3. Then, the bottom plate 3 is fixed to the tank body plate 2 to complete the tank 1. After that, the horizontal drive shaft 7 is moved, the movable tightening jig 7B is retracted to a predetermined position, and the tank 1 is unloaded by a carrying device (not shown). In the above embodiment, the tank shell plate 2 was formed in a cylindrical shape,
As shown in FIG. 4, the present invention can be similarly applied to the case where the bottom plate 3 having a substantially rectangular plate is fixed to the rectangular tank body plate 2 having a substantially rectangular cross section by welding. In this case, a movable tightening jig 7 for tightening and temporarily fixing the bottom plate 3
B may be configured not only from one direction but also from two or three directions. Furthermore, by adding a vertical drive mechanism that moves up and down according to the length of the tank body plate 2 to the fixed tightening 7A and the movable tightening jig 7B, reduction of setup time and automation can be promoted.

[0007]

As described above, according to the present invention, after holding the tank shell plate on the frame as described above, the bottom plate is moved to the bottom plate positioning portion of the tank on the inner side of the tank shell plate, and the fixed tightening jig and the movable tightening jig are used. By temporarily fixing with a jig, the bottom plate can be directly welded to the tank body plate directly from above, and the temporary welding work for temporary fixing can be eliminated. Since it is unnecessary to form the positioning position of the bottom plate by processing, the number of press working steps can be reduced. Further, since the positioning of the bottom plate is automatically performed by the positioning device, the work of attaching the bottom plate to the tank body plate can be automated and can be performed efficiently.
In addition, since the temporary fixing, which was performed by welding the tank body plate and the bottom plate, is not necessary, the welding conditions during the main welding are the same and welding defects can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a tank manufactured by the method of the present invention.

FIG. 2 is a plan view showing a configuration example of an apparatus for carrying out the present invention.

FIG. 3 is a sectional view taken along line CC of FIG.

FIG. 4 is a plan view showing another configuration example of an apparatus for carrying out the present invention.

[Explanation of symbols] 1 tank 2 tank body plate 2A flange 2B lower end of tank body plate 2C tank body plate-bottom plate tangent portion 3 bottom plate 4 frame 4A column 5 lower drive shaft 5A bottom plate holding bracket 6 upper drive shaft 6A bottom plate positioning bracket 7 Horizontal drive shaft 7A Fixed tightening jig 7B Movable tightening jig 8 Welding torch

Claims (1)

[Claims] 1. A method of manufacturing an electric equipment tank comprising a tank shell plate having both ends open and a flange at the upper end, and a bottom plate provided so as to close the lower end of the tank shell plate. And a lower drive shaft that moves in a direction perpendicular to the plane of the gantry, a bottom plate holding bracket provided at the tip of the lower drive shaft, and an upper drive shaft that moves in a direction perpendicular to the plane of the gantry. And a bottom plate positioning fitting provided at the tip of the upper drive shaft, a horizontal drive shaft that moves in the horizontal direction with respect to the surface of the gantry, a movable tightening jig provided at the end of the horizontal drive shaft, and a movable tightening jig. Prepare a positioning device equipped with a fixing and tightening jig that is installed opposite to the welding device, place the tank body plate with the flange surface facing downward, and place the bottom plate at any position inside the tank body plate. Stored in a stand After holding it, move the upper drive shaft downward to bring the bottom plate positioning bracket into contact with the lower end of the tank shell plate, and then move the lower drive shaft upward to push the bottom plate up with the bottom plate holding bracket and sandwich it with the bottom plate positioning bracket to temporarily fix it. After that, the horizontal drive shaft is moved in the direction of the tank body plate, the tank body plate and the bottom plate are temporarily fixed by the movable tightening jig and the fixed tightening jig, and then the lower drive shaft and the upper drive shaft are moved to move the bottom plate holding bracket. A method for manufacturing an electric equipment tank, characterized in that the bottom plate positioning metal fitting is retracted to a predetermined position, and then the bottom plate is welded to the tank body plate from above by the welding device.