JPH07256452A - Automatic welding equipment for corner plate and membrane sheet - Google Patents

Abstract

PURPOSE:To obtain an automatic welding equipment which can surely an efficiently weld a corner plate of a corner part and membrane sheet of a membrane type tank for low temperature liquified gas without especially requiring the excellent skill. CONSTITUTION:This equipment consists of a common manual TIG welding machine, a welding torch holder 12 which holds a welding torch 1 of the manual TIG welding machine and which can change its direction, a welding torch moving device composed with each axis moving mechanism in order to move its position to three axial directions, and a welding controller for controlling the manual TIG welding machine and the welding torch moving device. By regulating the direction and position of the welding torch 1 with the welding torch moving device arranged on a corrugation 14b, a corner plate 16 and a membrane sheet 14 can be smoothly welded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corner plate / membrane sheet automatic welding apparatus for welding a corner plate and an angle piece of a corner portion of a low temperature liquefied gas membrane tank.

[0002]

2. Description of the Related Art A membrane tank for a low temperature liquefied gas such as an LNG ship has a structure in which a heat insulating layer is arranged inside a partition wall and a membrane in contact with the low temperature liquefied gas is provided on the inner surface thereof. The membrane is a stainless steel sheet having vertical and horizontal corrugations at regular intervals to absorb heat shrinkage due to low-temperature liquefied gas to be stored. Has a complicated structure to secure its bond strength.

FIG. 3 is a perspective view showing the structure of the corner portion. The membrane bottom sheet 14 and the membrane standing sheet 15 are welded to both ends of the corner plate 16, respectively, and the corrugations 14a and 1
An angle piece 17 for wrapping 5a is covered and welded to the corner plate 16 to strengthen the connection of the corner portions. The corner plate 16 is a strength member made of stainless steel bent at a right angle and having a thickness of about 10 mm, and the angle piece 17 is a thin stainless steel plate bent at a right angle and having a corrugation in the width center.

Therefore, when welding the corner portion of such a membrane type tank, it is necessary to first weld the corner plate and the membrane sheet, and this welding is performed by the corrugation 14 existing at a pitch of several hundred mm.
Since it is necessary to proceed with welding while skipping a, welding has conventionally been performed by TIG hand welding by a welding operator.

[0005]

Due to the nature of the joint, which is not allowed to leak, the conventional welding method of the welding operator is
In addition to the need for a large number of highly skilled welding workers, there is also the problem that the work posture is cramped and the work efficiency is unavoidable.

The present invention has been made in order to solve the above problems, and reliably welds the corner plate of the corner portion of such a membrane tank to the membrane sheet without requiring particularly excellent skill. The purpose is to obtain a corner plate / membrane sheet automatic welding device that enables efficient work to be performed.

[0007]

In order to achieve the above object, a corner plate / membrane sheet automatic welding apparatus of the present invention comprises a general-purpose manual TIG welding machine and the manual TI.
The welding torch moving device of the G welder, and the welding control device that controls the manual TIG welding machine and the welding torch moving device are configured. The welding torch moving device includes a Z-axis moving mechanism that moves on a rail arranged on the corrugation portion of the membrane, an X-axis moving mechanism that horizontally moves orthogonal to the rail, and a Y-axis that moves vertically. It is provided with a moving mechanism and a welding torch holder which holds the welding torch of the manual TIG welder and vertically tilts it.

[0008]

In this invention, the welding torch moving device installed on the corrugated portion of the membrane at the corner of the membrane tank is actuated to freely move the position of the welding torch of the manual TIG welding machine, thereby Welding of seats to corner plates can be carried out smoothly.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention, showing a posture in which a membrane bottom plate sheet 14 is welded to a corner plate 16. FIG. 2 shows a posture when the corrugation 14a of the membrane bottom plate sheet 14 is jumped off in the embodiment of FIG.

In FIGS. 1 and 2, reference numeral 1 is a manual TIG.
A welding torch for a welding machine, which is connected to a general-purpose manual TIG welding machine body (not shown). 2 is corrugation 1
4b is a clamp for fixing on the rail, 3 is a rail, 5 is a plurality of wheels 4 rotated by a drive motor 6, and the rail 3 is
It is a gantry that moves up, and these constitute a monorail type Z-axis moving mechanism. Further, the knob 7 having a gear and the rack and pinion 8 constitute a gear type X-axis moving mechanism. Further, the drive motor 10 and the screw shaft 11 constitute a screw type Y-axis moving mechanism.

A welding torch holder 12 is attached to the Y-axis moving mechanism and holds the welding torch 1 of the manual TIG welding machine. Welding torch holder 12
Can be tilted up and down with the rotating shaft 9 as a fulcrum. A welding torch moving device is configured by the X-axis moving mechanism, the Y-axis moving mechanism, the Z-axis moving mechanism and the welding torch holder described above. The start and stop of TIG welding and the start and stop of each drive motor are controlled by an operator operating a welding control device (not shown).

The corner plate of the present invention as described above
The procedure for welding the membrane sheet 14 to the corner plate 16 using the automatic membrane sheet welding apparatus is as follows. First, the welding torch 1 is directed downward as shown in FIG. The welding position is set to 14 and welding is started. Then, when the welding torch 1 reaches the corrugation 14a by proceeding welding in the Z-axis direction by the operation of the drive motor 6,
The drive motor 5 is stopped and welding is stopped. Next, as shown in FIG. 2, the welding torch holder 12 is lifted upward with the rotating shaft 9 as a fulcrum so that the welding torch 1 does not come into contact with the corrugation 14a, and then the drive motor 5 is activated to remove the corrugation 14a. . When the corrugation 14a is completely removed, the drive motor 5 is stopped and the welding torch 1 is returned to the state shown in FIG.

By repeating the above procedure, the welding of the membrane sheet 14 to the corner plate 16 can be carried out smoothly. Further, the welding accuracy can be improved by operating the drive motor 10 during the welding in the above procedure to finely adjust the position of the welding torch in the height direction. Although it is possible to use the X-axis moving mechanism or the Y-axis moving mechanism to disengage the corrugation 14a in the above procedure, the tilting method with one touch and good reset accuracy is superior.

Therefore, by using the corner plate / membrane sheet automatic welding device of the present invention, the welding torch moving device installed on the corrugated portion of the membrane bottom plate sheet is operated to position the welding torch of the manual TIG welding machine. By freely moving, the welding of the membrane sheet 14 to the corner plate 16 can be reliably and efficiently performed without requiring a particularly excellent skill. In addition,
Since this device uses a general-purpose manual TIG welder,
By removing the welding torch 1 from the welding torch holder 12 as needed, it can be utilized for manual TIG welding by an operator.

In the embodiment shown in FIGS. 1 and 2, the welding of the membrane bottom plate sheet 14 to the corner plate 16 is shown, but the welding torch holder 12 is raised 90 ° upward with the rotating shaft 9 as a fulcrum. It is also possible to weld the membrane standing plate sheet 15 to the corner plate 16 by directing the welding torch 1 to the side. Furthermore, if the X-axis moving mechanism and the welding torch holder 12 are also tilted using the drive motor, the burden on the operator can be further reduced.

[0016]

In the corner plate / membrane sheet automatic welding device of the present invention, the welding torch moving device installed on the corrugated portion of the membrane bottom plate sheet is operated to freely position the welding torch of the manual TIG welding machine. By moving it, the welding of the membrane sheet to the corner plate can be performed smoothly, so the welding of the corner plate of the membrane tank and the membrane sheet, which conventionally required a large number of excellent welding technicians. The effect was that the work could be carried out reliably and efficiently without requiring skill.

[Brief description of drawings]

FIG. 1 is a diagram showing a state at the time of welding in an embodiment of the present invention.

FIG. 2 is a diagram showing a state where a corrugation is missed in the embodiment of FIG.

FIG. 3 is a perspective view showing a structure of a corner portion of a membrane tank.

[Explanation of symbols]

 1 Welding torch for manual TIG welder 2 Clamp 3 Rail 4 Wheel 5 Stand 6 Wheel drive motor 7 Knob with gear 8 Rack and pinion 9 Rotation axis 10 Y-axis drive motor 11 Support point 12 Y-axis screw axis 14 Membrane bottom sheet 14a Corrugation 14b Corrugation 15 Membrane standing sheet 15a Corrugation 15b Corrugation 16 Corner plate 17 Angle piece

Claims (1)

[Claims] 1. A manual TIG welder, a welding torch moving device for the manual TIG welder, and a welding control device for controlling the manual TIG welder and the welding torch moving device. The moving device includes a Z-axis moving mechanism that moves on a rail arranged in the corrugation portion of the membrane, an X-axis moving mechanism that horizontally moves orthogonal to the rail, a Y-axis moving mechanism that moves vertically, and the manual operation. T
An automatic corner plate / membrane sheet welding device that is equipped with a welding torch holder that holds the welding torch of the IG welder and tilts up and down.