JP2748290B2 - Manufacturing method of electric equipment tank - Google Patents

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 storing electric equipment such as an oil-filled transformer.

[0002]

2. Description of the Related Art As shown in FIG. 1, a tank 1 for accommodating electric equipment includes a tank body plate 2 having a flange 2A at an upper end and a bottom plate 3 attached by welding so as to close a lower end 2B of the tank body plate 2. After the electric equipment is stored in the tank 1, a cover plate (not shown) is attached to the flange 2A. In a conventional method of manufacturing such a tank 1,
A method of forming a bottom plate positioning position in the vicinity of the lower end 2B of the tank body plate 2 in advance by press working, and disposing the bottom plate 3 inside the tank body plate 2 and abutting the positioning position, or a method inside the tank body plate 2 Bottom plate 3 is arranged and lower end 2 of tank body plate 2
After adjusting the position from above by attaching a simple positioning metal fitting to the B side and temporarily fixing the bottom plate 3 to the joint portion between the tank body plate 2 and the bottom plate 3 by temporary welding at several places,
The bottom plate 3 was fixed to the tank body plate 2 by performing main welding manually from the outside.

[0003]

However, in such a method, a pressing work for forming a bottom plate positioning position on the tank body plate 2 or a welding work for temporarily fixing the tank body plate 2 and the bottom plate 3 are performed. The man-hours were required, and the main welding work for fixing the bottom plate 3 was performed manually. Therefore, the man-hours required for the main welding work could not reduce the manufacturing processing cost. Further, since the positioning of the tank body plate 2 and the bottom plate 3 was temporarily fixed by welding, welding conditions of the temporarily fixed portion and other portions were different during the main welding, and welding defects sometimes occurred. Therefore, the present invention is to automatically and efficiently attach the bottom plate 3 to the tank body plate 2.

[0004]

SUMMARY OF THE INVENTION The present invention relates to an electric apparatus comprising a tank body plate 2 having both ends open and a flange 2A at an upper end, and a bottom plate 3 provided so as to close a lower end 2B of the tank body plate 2. A method for manufacturing a tank, comprising: a gantry (4) for holding a tank body plate (2); a lower drive shaft (5) moving in a direction perpendicular to the lower surface with respect to the surface of the gantry (4); A holding metal fitting 5A, an upper drive shaft 6 that moves in a direction perpendicular to the upper 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 with respect to the surface of the gantry 4. A positioning device and a welding device including a moving horizontal drive shaft 7, a movable fastening jig 7 </ b> B provided at the tip of the horizontal drive shaft 7, and a fixed fastening jig 7 </ b> A provided opposite to the movable fastening jig 7 </ b> B Used. The tank body plate 2 is set in a state where the flange 2A surface side faces downward,
After the bottom plate 3 is arranged at an arbitrary position inside the tank body plate 2, it is held by the gantry 4. Thereafter, the upper drive shaft 6 is moved from the upper portion to the lower portion, and the bottom plate positioning metal fitting 6A is moved to the tank body plate 2.
The lower drive shaft 5 is moved from the lower portion to the upper portion, and the bottom plate 3 is pushed up by the bottom plate holding bracket 5A.
It is clamped and temporarily fixed with the bottom plate positioning fitting 6A. Thereafter, the horizontal 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 the movable fastening jig 7B and the fixed fastening jig 7A. Thereafter, the lower drive shaft 5 and the upper drive shaft 6 are moved to retract the bottom plate holding bracket 5A and the bottom plate positioning bracket 6A to predetermined positions, and then the bottom plate 3 is fixed to the tank body plate 2 by welding from above.

[0005]

After holding the tank body plate 2 on the gantry 4 as described above, the bottom plate 3 is moved to the bottom plate positioning portion inside the tank body plate 2, and the movable fastening jig 7B and the fixed fastening jig 7A are provided.
By temporarily fixing the bottom plate 3, the bottom plate 3 can be directly welded directly to the tank body plate 2 from above without performing the tack welding for temporarily fixing the bottom plate 3 to the tank body plate 2. , 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. In addition, since the temporary fixing of the tank body plate 2 and the bottom plate 3 performed by the temporary welding becomes unnecessary, the welding conditions at the time of the main welding become almost the same, and the welding defects can be reduced.

[0006]

An embodiment 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 cylindrical tank body plate 2, 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
It is sectional drawing. The positioning device used in the method of the present invention includes a gantry 4 on which the tank body plate 2 can be placed and held. A hole smaller than the outer diameter of the tank body plate 2 is formed substantially at the center of the gantry 4, and a vertically movable lower drive shaft 5 is disposed at the center. A disk-shaped bottom plate holding bracket 5A is fixed to the end of the lower drive shaft 5, and the outer diameter of the bottom plate holding bracket 5A is set smaller than the inner diameter of the tank body plate 2. In addition, an upper drive shaft 6 that can be moved up and down, which is held by a column 4A, is disposed above the mount 4. A disk-shaped bottom plate positioning bracket 6A is fixed to the end of the upper drive shaft 6, and the bottom plate positioning bracket 6A is formed with a step having 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. ing. A lateral drive shaft 7 that can move left and right is disposed substantially at the center of the column 4A of the gantry 4. A movable fastening jig 7 </ b> B divided into two parts having substantially the same diameter as the outer diameter of the tank body plate 2 is fixed to the tip of the horizontal drive shaft 7. A fixed fastening jig 7A having the same shape is arranged on the side opposite to the movable fastening jig 7B. In this embodiment, a positioning device is constituted by the gantry 4, the lower drive shaft 5 and the bottom plate holding bracket 5A, the upper drive shaft 6 and the bottom plate positioning bracket 6A, the lateral drive shaft 7, the movable fastening jig 7B, and the fixed fastening jig 7A. It is configured. Welding torch 8 above gantry 4
An automatic welding device (not shown) equipped with a welding torch 8 is provided in the tangential portion 2 between the tank body plate and the bottom plate.
The welding is automatically performed while moving along C. When attaching / detaching the tank body plate 2 to / from the gantry 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 brought into 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. Thereafter, the tank body plate 2 is transferred to the position of the gantry 4 by a transfer device (not shown), placed on the gantry 4, and the outside of the tank body plate 2 is brought into contact with the fixed fastening jig 7A. Thereafter, the upper drive shaft 6 is moved downward to lower the lower end 2B of the tank body plate 2.
Abut the bottom plate positioning fitting 6A. In this case, the disk portion of the bottom plate positioning metal fitting 6A larger than the outer diameter of the tank body plate 2 abuts on the lower end 2B of the tank body plate, and the disk portion smaller than the inner diameter of the tank body plate 2 enters the inside of the tank body plate 2. The thickness of the step portion inside this inside is the lower end 2B of the tank body plate 2.
It becomes the positioning dimension up to the bottom plate 3. Next, the lower drive shaft 5 is moved upward. At this time, the bottom plate holding bracket 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 bracket 6A. Abut,
The position of the bottom plate 3 is determined. Next, the horizontal drive shaft 7 is moved in the direction of the tank body plate 2, and the tank body plate 2 is fastened with the fixed fastening jig 7 </ b> A and the movable fastening jig 7 </ b> B to temporarily fix the bottom plate 3. In this case, the movable tightening jig 7B moves toward the tank body plate 2 and comes into contact with the tank body plate 2 and stops, so that the tank body plate 2 is automatically automatically kept in a fixed positional relationship with the automatic welding device. Positioned. Next, after the temporary fixation, the lower drive shaft 5 and the upper drive shaft 6 are moved to retract the bottom plate holding bracket 5A and the bottom plate positioning bracket 6A to predetermined positions. Next, the welding of the tank body plate 2 and the bottom plate 3 is performed while 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 tangential portion 2C between the tank body plate and the bottom plate. Then, the bottom plate 3 is fixed to the tank body plate 2 to complete the tank 1. Thereafter, the horizontal drive shaft 7 is moved, the movable fastening jig 7B is retracted to a predetermined position, and the tank 1 is unloaded by a transport device (not shown). In the above embodiment, the tank body plate 2 is formed in a cylindrical shape.
As shown in FIG. 4, the present invention can be similarly applied to a case where a bottom plate 3 of a substantially rectangular plate is fixed to a square tank body plate 2 having a substantially rectangular cross section by welding. In this case, a movable fastening jig 7 for fastening and temporarily fixing the bottom plate 3
B may be configured not only from one direction but also from two or three directions. Furthermore, if a vertical driving mechanism that moves up and down according to the length of the tank body plate 2 is added to the fixed tightening 7A and the movable tightening jig 7B, the setup time can be reduced and automation can be promoted.

[0007]

According to the present invention, as described above, after the tank body plate is held on the gantry, the bottom plate is moved to the bottom plate positioning portion of the tank inside the tank body plate, and the fixed tightening jig and the movable tightening member are moved. By temporarily fixing with a jig, the bottom plate can be directly welded directly to the tank body plate from above, and the temporary welding work for temporary fixing can be eliminated. It is not necessary to form the positioning position of the bottom plate by processing, and 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.
Further, since the temporary fixing, which has been performed by welding the tank body plate and the bottom plate, becomes unnecessary, the welding conditions at the time of the main welding are the same, and welding defects can be reduced.

[Brief description of the drawings]

FIG. 1 is a 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 implementing the present invention.

FIG. 3 is a sectional view taken along line CC of FIG. 2;

FIG. 4 is a plan view showing another example of the configuration of the device embodying the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 tank 2 tank body plate 2A flange 2B lower end of tank body plate 2C tank body plate-bottom plate tangential portion 3 bottom plate 4 mount 4A support 5 lower drive shaft 5A bottom plate holding bracket 6 upper drive shaft 6A bottom plate positioning bracket 7 horizontal drive shaft 7A Fixed fastening jig 7B Movable fastening jig 8 Welding torch

Claims (1)

(57) [Claims] 1. A method for manufacturing an electric equipment tank comprising a tank body plate having both ends open and having a flange at an upper end, and a bottom plate provided so as to close a lower end of the tank body plate. A lower drive shaft moving in a direction perpendicular to the lower surface with respect to the surface of the gantry, a bottom plate holding bracket provided at a tip of the lower drive shaft, and an upper drive shaft moving in a direction perpendicular to the upper surface with respect to the surface of the gantry A bottom plate positioning bracket provided at the end of the upper drive shaft, a horizontal drive shaft moving horizontally 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 fixed tightening jig provided opposite to, and a welding device, place the tank body plate with the flange surface facing down, and place the bottom plate at an arbitrary position inside the tank body plate. On the base Then, move the upper drive shaft downward to bring the bottom plate positioning bracket into contact with the lower end of the tank body plate, and then move the lower drive shaft upward to push up the bottom plate with the bottom plate holding bracket and temporarily fix it with the bottom plate positioning bracket. After moving the horizontal drive shaft in the direction of the tank body plate and temporarily fixing the tank body plate and bottom plate with the movable fastening jig and fixed fastening jig, move the lower drive shaft and upper drive shaft to move the bottom plate holding bracket A method for manufacturing a tank for electric equipment, comprising: retreating a bottom plate positioning metal fitting to a predetermined position, and then welding the bottom plate to the tank body plate from above by the welding device.