JP2648576B2 - Temporary welding flange / pipe holder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flange pipe holder for temporary welding which is used for temporary welding performed prior to main welding when a flange is welded to one end of a pipe.

[0002]

2. Description of the Related Art Conventionally, when a flange is temporarily welded to one end of a pipe, an insertion port of the flange is fitted to one end of the pipe so that a gap between the flange and the pipe is uniform and the flange is perpendicular to the pipe. And weld the outer peripheral surface of the pipe and the inner edge of the insertion opening of the flange at one place. Then, adjust the flange while hitting it with a hammer or the like so as to obtain a right angle between the flange and the pipe using a sashigane or a square, and then perform welding at a position opposed to the welding position, Thereafter, adjustment is performed in the same manner as described above so that a squareness is obtained between the two. After the flange is temporarily welded to the pipe as described above, the main welding is performed.

[0003]

However, as described above, when the temporary welding is carried out while the squareness between the flange and the pipe is made with a sashigane or the like, since the welding is performed visually, it is necessary to accurately obtain the squareness. Can not. In addition, since the flange may be deformed due to thermal stress during the temporary welding, the angle is adjusted with a hammer or the like every time one place is welded.
This is very time consuming. Specifically, even a skilled worker can perform a temporary welding operation on a set of flanges and a pipe,
It requires a time of up to 2 minutes, and has a problem that workability is extremely poor. Accordingly, the present invention has been made in view of the above problems, and has been made to simplify the temporary welding between the flange and the pipe, and
An object of the present invention is to provide a temporary welding flange / pipe holding jig capable of performing welding with a significantly reduced welding time.

[0004]

In order to achieve the above object, according to the first aspect of the present invention, a temporary welding flange / pipe holder is provided around a through hole of a flange receiving plate having a through hole. A plurality of slits in the axial direction, a tubular pipe holding portion fitted to the inner surface of the pipe is provided so as to project perpendicularly to the surface of the flange receiving plate, and has a split groove provided with a connecting piece at a tip end. A plurality of stoppers are provided on the surface of the flange receiving plate so as to fit with the bolt holes of the flange so that a wedge can be driven into a split groove between the connecting piece and the flange, and a base of the pipe holding portion is provided. An annular protrusion having substantially the same diameter as the insertion diameter of the flange is provided, and a pipe fixing means for fixing and releasing the pipe by expanding and contracting the diameter of the pipe holding portion is attached to the flange receiving plate.

According to a second aspect of the present invention, the pipe fixing means includes a single-rod double-acting cylinder attached to the back surface of the flange receiving plate, and a tapered surface having a large tip end diameter of the pipe holding portion. A head member that has a reversely tapered surface that moves and that is attached to the tip of the rod of the cylinder that passes through the inside of the pipe holding portion.

[0006]

According to the first aspect of the invention, the flange can be positioned at a predetermined position by fitting the insertion port of the flange into the annular projection and abutting the flange receiving plate. Then, when the pipe holding portion of the flange receiving plate is inserted into the pipe and the pipe holding portion is expanded by the pipe fixing means, the gap between the pipe and the insertion port of the flange is evenly centered, and the flange has its bolt hole. Is fitted to the stopper, and the flange is forcibly pressed against the flange receiving plate by driving of the wedge, so that the flange is not deformed by thermal stress at the time of temporary welding. That is, the flange is maintained at a right angle to the pipe. According to the second aspect of the present invention, by moving the head by driving the cylinder, the pipe holding portion divided by the slit expands and contracts over a wide range in the axial direction, and the pipe holding portion is positioned on the inner peripheral surface of the pipe. In such a way as to be pressed against each other.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. The temporary welding flange / pipe holder T according to the present invention generally includes a flange receiving plate 1 and a pipe fixing means 10.

The flange receiving plate 1 has a disk shape,
A through hole 2 is provided at the center, and one surface is a smooth surface 3. On the smooth surface 3 side (surface) of the flange receiving plate 1, a cylindrical pipe holding portion 4 projects from the periphery of the through hole 2 at right angles to the smooth surface 3. And
The outer diameter of the pipe holder 4 is slightly smaller than the inner diameter of the pipe P to be applied, and has a plurality of slits 5 in the axial direction. An annular projection 6 having substantially the same diameter as the diameter of the port Fa is provided. The inner peripheral surface of the distal end portion of the pipe holding portion 4 is a tapered surface a whose inner diameter increases toward the distal end.

The pipe fixing means 10 comprises a single rod type double acting cylinder 11 and a head member 14 attached to the tip of the cylinder rod 13. That is, the cylinder 11 is a double-acting cylinder in which the cylinder rod 13 reciprocates by switching the ports c and d connected to the pressure source. The male screw 12 is screwed into the cylindrical portion 7 provided at the center of the back surface of the flange receiving plate 1. By doing so, it is attached to the flange receiving plate 1.

Then, the cylinder rod 13 penetrates through the through hole 2 of the flange receiving plate 1 and the inside of the pipe holding portion 4 by the attachment. The head member 14 at the tip of the cylinder rod 13 is attached with screws 13a and 14a. The outer diameter of the head member 14 is reduced toward the right in the drawing as shown in FIGS. It has a tapered surface b and comes into contact with the tapered surface a formed on the inner surface at the tip of the pipe holding portion 4. The annular projection 6 and the pipe holding portion 4 of the temporary welding flange / pipe holding tool T are prepared corresponding to a flange and a pipe to be applied, and the pipe fixing means 10 has the structure described above. The cylinder rod 13 may be manually moved by a screw mechanism.

When the flange F is fitted to the annular protrusion 6, two stoppers 9 are provided at least at positions facing the flange receiving plate 1 so as to fit into the bolt holes Fb of the flange F. Positioning is performed while preventing movement.

Further, as shown in FIG. 5, the stopper 9 is provided with a split groove 9a having a connecting piece 9b at its tip, and after fitting the bolt hole Fb of the flange F, the connecting piece 9b and the flange F The flange F can be forcibly fixed to the flange receiving plate 1 by driving a wedge 9c between the flanges.

Next, a method of using the temporary welding flange / pipe holder T having the above-described structure will be described. First, the pipe P is fixed by means not shown. Then, the insertion hole Fa of the flange F is fitted to the outer periphery of the annular projection 6 of the flange receiving plate 1 and the bolt hole F of the flange F is formed.
The flange b is fitted into the stopper 9, the wedge 9c is driven into the split groove 9a between the connecting piece 9b and the flange F, and the flange F is pressed against the smooth surface 3 of the flange receiving plate 1 to fix the position. In this state, the pipe holding portion 4 of the flange receiving plate 1 is inserted into the pipe P until its end surface comes into contact with the front surface of the annular projection 6.

Then, the port c of the cylinder 11
For example, high-pressure air is supplied, and the cylinder rod 13 is moved in FIG.
Move from the state to the right. By this movement, the pipe holding portion 4 having the slit 5 formed therein is uniformly expanded by the tapered surfaces a and b, and the pipe P and the flange receiving plate 1 are integrated. In this case, the flange F is formed by the annular projection 6 and
Since the pipe P is positioned by the pipe holding portion 4 and the end face of the annular projection 6, the flange F maintains a uniform gap C with the outer peripheral surface of the pipe P, and maintains a right angle with the pipe P. It has become.

Thereafter, a corner R between the flange F and the pipe P is formed.
At a plurality of places, but the flange F is
However, since the flange F is forcibly pressed by the wedge 9c as described above, even if the flange F is deformed by the thermal stress at the time of welding, the deformation is forcibly prevented.
When the flange F is bent and fixed to another flange F with bolts and nuts, a gap may be formed between them, or the flange F and the pipe P
Does not occur such that a desired perpendicularity cannot be obtained. Thereafter, the high pressure air is switched and supplied to the port d of the cylinder 11 to extend the cylinder rod 13, and the fixing of the pipe P to the flange receiving plate 1 is released. Thereafter, the temporary welding flange pipe holder T is removed from the pipe P to perform the main welding.

In this case, the tip of the pipe P is drawn inward from the front surface of the flange F by the height H of the annular projection 6, and this portion is internally wound during the main welding.
Therefore, the height of the annular projection 6 can be appropriately changed depending on the amount of inner winding welding.

If the pipes P are already attached to a plurality of devices, and the flanges F are attached to the pipes P to connect the pipes P, the flanges F
It is necessary to make the arrangement of the bolt holes Fb the same. In such a case, a level mounting portion is provided on the back surface of the flange receiving plate 1, and the level (not shown) is horizontal when the bolt hole Fb of the flange F is fitted to the stopper 9. The flange F may be temporarily welded to the pipe P. In this case, the level mounting portion may be formed by attaching an L-shaped metal fitting to the back surface of the flange receiving plate 1, or the stopper 9 may be projected from the back surface of the flange receiving plate 1, and the upper surface of the protruding portion may be leveled. It may be a part of the container mounting part.

Further, as the flange receiving plate 1 itself, the same one as the flange to be applied may be used. In this case, like the stopper 9, a rod-shaped body 9 ′ is attached to another one of the bolt holes. A level mounting portion may be constituted by the rear projecting portion of the stopper 9 and the upper surface of the rod 9 '(FIG. 3).
reference).

[0019]

As is clear from the above description, according to the first aspect of the present invention, the pipe holding portion and the annular projection make the
The squareness between the flange and the pipe is set and fixed, so that the squareness can be easily and accurately formed without the need for jigs such as sashigane and skewers, even if not a skilled worker. can do. In addition, the perpendicularity between the flange and the pipe is due to the fact that the flange is forcibly pressed to the flange receiving plate by the wedge, so that the bolt hole of the flange fits into the stopper, and the thermal stress during welding during the temporary welding work. Preventive welding work can be performed accurately and easily because the deformation caused by the welding is prevented and maintained, the work time is reduced to about 40 seconds, about 1/3 of the conventional work, and the workability is greatly improved. Can be. Furthermore, since the height dimension of the annular protrusion is formed to be the same as the inner winding welding height, an accurate inner winding welding height can be obtained only by mounting the flange and the pipe. Furthermore, a uniform gap can be formed between the inner peripheral surface of the attached flange and the outer peripheral surface of the pipe due to the presence of the annular projection, and uniform welding can be performed. According to the second aspect of the present invention, the outer diameter of the pipe holding portion is expanded over a wide range because the outer surface of the head member and the inner surface of the pipe holding portion are formed with the tapered surfaces. , And can be securely fixed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a temporary welding flange / pipe holder according to the present invention.

FIG. 2 is a perspective view of the temporary welding flange / pipe holder of FIG. 1, a flange, and a pipe.

FIG. 3 is a partially enlarged sectional view of FIG. 1;

FIG. 4 is a partially enlarged cross-sectional view showing a holding state of the flange and the pipe by the holder of FIG. 1;

FIG. 5 is a perspective view showing a main part of FIGS.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Flange receiving plate, 2 ... Through-hole, 4 ... Pipe holding part, 5
... Slit, 6 ... Circular projection, 9 ... Stopper, 10 ... Pipe fixing means, 11 ... Cylinder, 13 ... Cylinder rod,
14 ... head member, F ... flange, Fa ... insertion port, Fb ...
Bolt holes, a, b: tapered surface, P: pipe.

Claims (2)

(57) [Claims] 1. A cylindrical pipe holding portion having a plurality of slits in an axial direction at a tip thereof and fitted to an inner surface of a pipe, around a periphery of the through hole of the flange receiving plate having a through hole. And a plurality of stoppers having a split groove provided with a connecting piece at a tip thereof are provided so as to fit with bolt holes of the flange on the surface of the flange receiving plate, and the connecting piece and the flange are provided. A wedge can be driven into the split groove between the two, and an annular protrusion having a diameter substantially equal to the insertion diameter of the flange is provided at the base of the pipe holding portion, and the diameter of the pipe holding portion is set in the flange receiving plate. A flange and pipe holder for temporary welding, wherein pipe fixing means for fixing and releasing a pipe by expanding and contracting is attached. 2. A single-rod double-acting cylinder, wherein the pipe fixing means is attached to a back surface of the flange receiving plate;
The pipe holding portion has a tapered surface having a large tip diameter and an inverted tapered surface that slides, and a head member attached to a rod tip of the cylinder penetrating through the pipe holding portion. 2. The temporary welding flange / pipe holder according to claim 1, wherein: