JPH08290297A - Jig for welding piping - Google Patents

Abstract

PURPOSE: To obtain a jig which is used for shop welding of a piping block used in the piping of various plants and which is simple and capable of efficient flat rotational welding. CONSTITUTION: The jig is constituted of a pair of disk-like members 1 to be attached to both ends of a piping block, tack positioning pipes 2 each projectingly fixed coaxially to the members 1, and a fixing part for attaching the pipes 2 to the piping block; also, both ends are fixed by inserting a connecting rod 3 through the holes of respective disk like members 1 arranged at both ends and fastening it with bolts 6. Then, one of the pipes 2 is attached to the turntable of a positioner so as to make it rotatable. As an example of the piping block, rotational welding is performed along the weld seam 11, using a block body provided with eccentric reducers 8 on both sides and a tee 7 in the center. A centering adjustment is also carried out by means of the bolt 5 of a bolt base 4 so that the center of the piping block and that of the pipe 2 are aligned coaxially in the welding position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for factory welding of a piping block used for piping in various plants.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show an example of a conventional factory welding jig for plant piping and welding means.

FIG. 4 shows an example of a shape diagram of a piping block to which a conventional welding method is applied, and FIG. 5 is an explanatory view of a conventional welding work situation for welding the block.

In these figures, 9 is a straight pipe portion of a pipe block to be welded, 10 is an elbow for connecting the straight pipe portion 10 by welding, 11 is a welding line, and the straight pipe portion 9 is being rotated. The welding torch 16 provided at the upper position automatically welds downward.

One end of the straight pipe portion 9 is gripped and rotated by the turntable 13 of the positioner 12. Reference numeral 14 is a pedestal that supports the roller 15.

[0006]

By the way, when the conventional welding construction technique as described above is applied to, for example, a pipe block having a shape as shown in FIG. 6, there is no straight pipe portion in the block. Automatic welding cannot be performed while rotating the piping block as shown in FIG.

Therefore, there is a problem that the welding must be performed by inefficient manual welding.

An object of the present invention is to solve the above problems and to provide a new pipe welding jig capable of performing downward rotary automatic welding by using a simple jig to improve welding work efficiency. There is.

[0009]

As a structure for achieving the above-mentioned object, a pipe welding jig of the present invention is a pair of left and right disc-shaped members for attaching to both ends of a pipe block used for various plant pipes. A sharpening tube concentrically fixed to the member, and a bolt pedestal projecting on the outer periphery of the disk-shaped member in four directions at equal intervals in a direction opposite to the projecting direction of the sharpening tube. Plumbing attachments made up of bolts to be inserted into holes formed in the pedestal are respectively provided, and the pair of left and right jigs are connected by one connecting rod, and both ends of the connecting rod are disc-shaped. It is characterized in that it is configured to penetrate the member and be fixed by a bolt.

[0010]

The pipe welding jig of the present invention having the above-described structure is
At the time of use, a pair of disc-shaped members are attached to both ends of the piping block so as to face each other, fixed by connecting rods, and then attached to one of the disc-shaped members concentrically on the turntable of the positioner. Mount and fix the grinding tube part, and rotatably support the other grinding tube part that is integrally fixed concentrically with the other disk-shaped member by the roller on the pedestal, and rotate the turntable in this state. As a result, the required welding portion of the piping block is automatically welded downward by the welding torch.

At this time, the outer circumferences of both sides of the piping block are clamped and clamped so as to be centered by bolt pedestals protruding at equal intervals on the outer periphery of the disk-shaped member and bolts inserted into holes formed in the pedestal. It is fixed to a pair of disk-shaped members arranged to face each other.

Further, the welding line is always rotated at the same position by adjusting so that the center of rotation of the welded portion is coaxial with the center of rotation of the sharp tube, that is, the center of rotation of the positioner.

As a result, downward rotary welding is possible, efficiency is excellent, and stable automatic welding can be performed in terms of quality.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a pipe welding jig according to an embodiment of the present invention, FIG. 2 is an explanatory view showing a mounting state of the jig, (a) is a side sectional view, (b) is A- of (a). FIG. 6 is a view from the direction of arrow A, FIG. 3 is an explanatory view of a welding execution state using the jig, and FIG.

To enable downward rotary automatic welding, FIG.
In the piping block having the shape as shown in (1), it is necessary to provide a straight pipe portion for gripping the piping block and a straight pipe portion for receiving the piping block.

For this reason, in the present invention, as shown in FIGS. 1 to 3, a pair of disk-shaped members 1 to be attached to both side ends of a piping block, and concentrically fixedly fixed to the members 1, respectively. It consists of a flexible pipe 2 and a fixing part for mounting the pipe to a piping block, and a single connecting rod 3
Both ends of the disk-shaped member 1 are fixed by the bolts 6 through the holes formed in the disk-shaped members 1 arranged on both sides to prevent the displacement in the longitudinal direction and reinforce the fixation by the bolts.

Each of the trough pipes 2 projecting outward from each of the disc-shaped members 1 attached to both ends of the pipe block,
The pipe block is constructed so that both ends thereof are extended, and one of the stub tubes 2 is positioned as shown in FIG.
The turntable 13 is detachably attached.

On the other hand, the other stub tube 2 is adapted to receive a piping block, and the roller 15 on the receiving stand 14 shown in FIG.
Placed on top.

As an example of the shape of the piping block, as shown in FIG. 6, a block main body having eccentric reducers 8 and 8 on both sides and a tee 7 at the center is formed, and the left and right eccentric reducers 8 and 8 are formed. 8 and the central tee portion 7 are weld lines 11
Is welded by rotation. 16 is a welding torch.

At the time of mounting the piping block shown in FIG. 2, centering adjustment is carried out so that the core of the piping block and the core of the sharp pipe at the welding position coincide with each other. Therefore, the position of the bolt 5 screwed onto the bolt pedestal 4 is adjusted and attached.

In the case of the piping block of FIG. 6 shown as an example, the rotary automatic welding of the two welding lines 11, 11 in the figure becomes possible.

However, the present invention is not limited to the jig for welding the piping block having the above-mentioned shape, but can be widely applied to a piping block having no straight pipe portion.

[0023]

INDUSTRIAL APPLICABILITY The present invention can be applied to the welding of a piping block having a shape as shown in FIG. 6, for example, which could not be carried out by the conventional quality stable automatic welding. And efficient downward rotary welding,
Welding work that is stable in quality and highly productive can be performed.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a pipe welding jig according to an embodiment of the present invention.

2A and 2B are explanatory views showing a mounting state of the jig, in which FIG. 2A is a side sectional view and FIG. 2B is a view taken along the line AA of FIG.

FIG. 3 is an explanatory view of a welding execution state using the jig.

FIG. 4 is a shape diagram of an example of a piping block to which a conventional welding method is applied.

FIG. 5 is an explanatory diagram of a welding construction situation by a conventional welding method.

FIG. 6 is a shape diagram of an example of a piping block to which the jig of the present invention is applied.

[Explanation of symbols]

 1 Disc-shaped member 2 Yatoi tube 3 Connecting rod 4 Bolt pedestal 5,6 Bolt 7 Tee 8 Eccentric reducer 11 Welding line 12 Positioner 13 Turntable 14 Cradle 15 Roller 16 Welding torch

Claims (1)

[Claims] 1. A pair of left and right disc-shaped members to be attached to both side ends of a piping block used for various plant pipes, a sharpening tube coaxially fixed to the members, and a disc-shaped member. Piping mounts, each of which is provided on the outer periphery at equal intervals in four directions and project in a direction opposite to the direction of the projection of the above-mentioned sharp tube, and a pipe mounting portion composed of a bolt to be inserted into a hole drilled in the pedestal, are further provided. A pipe welding jig, characterized in that a pair of left and right jigs are connected by a single connecting rod, and both end portions of the connecting rod are penetrated through the respective disc-shaped members and fixed by bolts.