JP3239985B2 - Piping connection jig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connection jig, and more particularly to a pipe connection jig suitable for welding a large number of pipes used in a boiler when constructing a thermal boiler of a thermal power plant. About the tool.

[0002]

2. Description of the Related Art In general, each component of a thermal power plant is an assembly of piping facilities, and each component block is large. Therefore, these components are divided into modules in advance and manufactured at a factory. We are trying to make a joint welding of comrades. For example, the outer wall of the furnace has a multi-pipe structure, and a water tube is wound around a spiral so that the furnace is not destroyed by the combustion of the furnace. The furnace is divided into four parts vertically and modularized. The divided modules are manufactured in advance in a factory, brought into the site, and the modules are welded together to construct a furnace outer wall surface.
Such operations are common in the construction of furnace coils and the like.

[0003] Each module alone has a structure in which divided pipes are welded in advance, but at a construction site, pipes are welded and connected at divided ends. In this welding work between pipes, it is necessary to set the centering of the paired pipe split ends and the welding gap to have predetermined dimensions, and even if the module is as designed, the pipe split ends are not connected at the site. The cores and gaps of the pipes were not constant, so in the field work, the alignment of a pair of pipes was performed by multiple people using multiple chain blocks, and the gap adjustment was also performed by cutting the pipe ends .

[0004]

However, there are thousands to tens of thousands of pipes to be welded, and when these individual pipes are connected by the above-described operation, a great deal of time is required for a worker. And the working efficiency was very poor.

The present invention pays attention to the above-mentioned conventional problems, and as in the case of the pipe connection between the pipe assemblies modularized as described above, the groove of the pipe in which the pipe base is fixed to a rigid body in advance. It is an object of the present invention to provide a pipe connection jig that can be easily adjusted.

[0006]

In order to achieve the above object, a pipe connection jig according to the present invention is a pipe connection jig used for pipe welding between pipe units, and is capable of enclosing a pipe. Is the top of the triangular frame
By providing a pair via a common shaft disposed at a point , each pipe to be connected can be wrapped by the triangular frame, and the arm plate constituting the side of the triangular frame has a pipe wrapped therein. Tightening means capable of pressing the outer surface is provided, and a pair of triangular
Characterized by providing means for adjusting the interval between comrades
I have .

Further, the present invention relates to a pipe connection jig used for pipe welding between pipe units, wherein a pair of triangular frames capable of enclosing pipes are provided via a common shaft disposed at the apex thereof. Each of the pipes can be enclosed by the triangular frame, and an arm plate constituting a side of the triangular frame is provided with a fastening means capable of pressing the outer surface of the enclosed pipe, and The pivotal connection to the arm plate forming the side is configured as an eccentric shaft.

[0008]

According to the above construction, the pipe is wrapped by the triangular frame, and the pipe is forcibly pushed into the inner corner portion of the triangular frame located in the tightening direction by operating the tightening means. The tubing will be positioned at the corners of the pair of triangular frames. Thereby, the centering of the pipe is performed. At this time, by setting the inscribed circle of the triangular frame larger than the pipe, the work of wrapping the pipes that are mutually misaligned with each other can be easily performed.
The wrapping operation can be opened and closed by detachably mounting the common shaft arranged at the top of the frame, and each triangle frame can be wrapped around the corresponding pipe.
Further, by providing the interval adjusting means between the pair of triangular frames, the welding gap of the pipe which is wrapped in the triangular frame and is fixed and held by the tightening means can be freely adjusted. This means that the triangular frames are biased against the common shaft in a direction approaching each other, while the frame position can be moved along the shaft by a nut member or the like against the biasing direction. Should be able to extend the interval of.

[0009] Further, by forming the pivotal connection to the arm plate which constitutes one side of the triangular frame as an eccentric shaft, if this eccentric shaft is rotated, the length of one side of the triangular frame becomes variable. . As a result, the position of the wrapped pipe can be finely moved within the triangular frame, and fine adjustment of the position of the axis of the pipe is possible. By setting the eccentric shaft with respect to one of the triangular frames, the bending of the shaft can be used to finely adjust the relative position with respect to the pipe in a constant holding state by the other triangular frame.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete embodiment of a pipe connecting jig according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a front view of a pipe connecting jig of the embodiment, and FIG. 2 is a plan view of the pipe connecting jig in an unfolded state. As shown in the figure, the pipe connection jig 10 is a pair of triangular frames 12 (12
R, 12L), each of which has a common shaft 14 (14A, 14L)
B, 14C). Each of the triangular frames 12 is a hinged connection of three arm plates 16 to each other. For this reason, each of the arm plates 16 has a hinge sleeve 18 for shaft insertion at an end edge thereof.
By inserting the shaft 14 through the hinge sleeves 18 of the adjacent plates 16 in a tandem state, the shaft 1
4 is possible. The triangular plate 16 allows one shaft 14B to be attached and detached so that the three arm plates 16 can be deployed.
By inserting B, the pipe can be covered.

The distance between the vertices of the triangular frame 12 is the same and forms an equilateral triangle as viewed from the front view side as shown in FIG. It is set large so that the pipe 20 is loosely fitted in the initial wrapped state. Then, in order to fix and hold the pipe 20 in the frame, first, the pipe 20 is held at the narrow angle portion 21 formed in a V shape by a pair of adjacent arm plates 16X and 16Y. At this time, an inclined groove portion 22 is formed on the inner surfaces of the arm plates 16X and 16Y so as to gradually decrease in wall thickness from the hinge sleeve 18 at both ends to the center, and a pipe seat is formed at the bottom of the groove. 24 are provided. As a result, the outer surface of the pipe 20 becomes a pair of left and right arm plates 16X, 16X.
Two points can be held by the Y seat 24.

On the other hand, the remaining arm plate 16Z facing the narrow angle portion 21 has a flat inner surface without the inclined groove portion 22, and the arm plate 16Z has, as shown in FIG. A tightening screw 28 as a tightening means for pressing the outer surface of the fitted pipe 20 toward the narrow angle portion 21 can be mounted. For this reason, a screw hole 30 is formed in the center of the arm plate 16Z so that the screw 28 can be screwed and pushed. Thereby, the tip surface of the screw 28 presses the pipe 20, and the pipe 20 sandwiched between the
Are fixedly held inside the triangular frame 10 at three points by two receiving seats 24 and tightening screws 28 arranged at intervals of about 120 degrees. The tip surface of the screw 28 is formed in a spherical shape so that the surface in contact with the pipe 20 rotates smoothly, and the outer end surface portion is provided with a head in which a rotary operation rod is inserted and a hole 32 is formed. . The tightening screw 28 can have a hydraulic screw structure, and can be selectively used depending on the type of the pipe 20.

Incidentally, the triangular frames 12R, 12R
L has a large-diameter portion 34 formed at an intermediate portion of the common shaft 14 so as to be at a constant interval.
Are kept in contact by contacting the inner side surfaces of the. In such a triangular frame 12R, 12L, it is necessary to adjust the butting distance between the pair of pipes 20 so that the specified welding gap is obtained in a state where the pipes 20 are pressed and held together. For this reason, the triangular frames 12R, 12R
Means for adjusting the interval between L is provided. This is 2
A fixing nut 36 is attached to one end of each of the shafts 14A and 14C.
Is attached to the outer surface of one triangular frame 12L, and the other end is provided with a compression spring means 38 for urging the outer surface of the other triangular frame 12L in a direction in which the frames approach each other. The gap adjusting nut 40 is screwed onto the central large-diameter portion of the shaft 14A. By rotating the adjusting nut 40, the substantial length of the large-diameter portion 40 is made variable, so that a pair of triangular frames 12R, 12L interval
Is adjustable.

From the above, the pipe connection jig 1
At 0, the outer circumference of each pipe 20 to be connected is wrapped by the triangular frames 12R, 12L, and the pipe 20 enclosed by the operation of the tightening screw 28 is included by the pair of arm plates 16X, 16Y. It can be pressed against the part 21. As a result, the pair of equal-diameter pipes 20 to be connected is positioned by the wedge action on the included angle portion 21, and the pair of triangular frames 12 </ b> R and 12 </ b> L are concentrically arranged by the common shaft 14. Alignment is performed using the formation surface of 21 as a reference surface. After the alignment of the pipe 20 is performed, the welding gap can be accurately adjusted to a predetermined value by operating the gap adjusting nut 40.

Incidentally, since the welding distal end portion of the pipe 20 is forcibly fixed and held by the triangular frames 12R and 12L, the piping axis may not be straight in relation to the base fixing portion side. Fine adjustment of the pipe holding state may be required. For this reason, in this embodiment, the pivoted portion of the shaft 14B inserted into one end of the arm plate 16Y constituting one side of one triangular frame 12L is formed as an eccentric shaft 14Bd. That is, the hinge hole of the hinge sleeve 18Y provided at one edge of the arm plate 16Y is formed as an eccentric hole 18Yd,
A part of the shaft 14B inserted therethrough is formed as an eccentric shaft 14Bd. In the example shown in FIG. 2, the substantial length of the arm plate 16Y can be extended by the rotation of the eccentric shaft 14Bd.
To form the eccentric shaft 14Bd, the shaft 14B
Is divided into two parts, and the eccentric shaft 14Bd is inserted and connected to the large-diameter portion 34 of the shaft 14 on one triangular frame 12R side. The eccentric shaft 14Bd is formed only in the portion inserted into the arm plate 16Y, and the pivot portion to the arm plate 16Z that is connected at the same time is not eccentric. In order to rotate the eccentric shaft 14Bd,
An insertion hole 44 for an operation rod is formed in the shaft head 42.

With such a configuration, the eccentric shaft 1 is held while the pipe 20 is held by one triangular frame 12L.
When 4Bd is rotated, the substantial length of the arm plate 16 is changed, and the equilateral triangular state of the triangular frame 12L shifts to the isosceles triangular state. This is realized by the shaft bending of the shaft 14, but the adjustment range is reduced so that the bending deformation is minimized and performed within the elastic range that can be restored. Due to such a triangular deformation, the angle of the included angle portion 21 constituting the holding reference plane of the pipe 20 changes, whereby the pipe 20 is connected to the other triangular frame 12.
The relative position with respect to the pipe 20 held at R can be changed. By using both the operation by the eccentric shaft 14Bd and the operation by the tightening screw 28, fine adjustment of the pipe 20 becomes possible, and more accurate adjustment of the pipe butting portion becomes possible.

FIG. 3 shows a modification, in which the holding length of the pipe 20 by the triangular frame 12 is increased to stabilize the holding force, and the width of the arm plate 16 is increased. This is an example in which two fastening screws can be attached to each frame 12. Such deformation can be arbitrarily set according to the size of the pipe 20 to be welded.

As described above, according to the above embodiment, the pair of triangular frames 12R and 12L are connected and integrated by the common shaft 14, and the pipe 20 is wrapped by the triangular frames 12, while Of the two pipes 20 can be centered by a wedge action by pressing against the narrow angle portion 21 formed between the arm plates 16X and 16Y. Then, the welding gap between the pipes 20 can be easily adjusted by the adjusting nut 40, and it is possible to easily cope with a strict gap setting. In particular, one of the pipes 20 held by providing the eccentric shaft 14Bd
Can be finely adjusted, thereby making it possible to perform higher fine adjustment, which is effective for pipe welding work of thermal power generation equipment ranging from thousands to tens of thousands of points.

The pipe spacing adjusting means may be provided on a plurality of shafts 16 and is not limited to the nut 40. A construction in which a threaded elastic sleeve or the like is attached to the large diameter portion 34 is also possible. .

[0021]

As described above, according to the pipe connection jig according to the present invention, a pipe connection jig used for connecting pipes between pipe units, and a triangular frame capable of enclosing pipes , By providing a pair via a common shaft arranged at the apex of the triangular frame, each pipe to be connected can be wrapped by the triangular frame, and wrapped on an arm plate constituting a side of the triangular frame. By providing a tightening means capable of pressing the outside of the pipe, the centering can be simultaneously performed by fixing and holding the pair of pipes at a fixed position by wedge action, welding butt is easily performed, and By providing the means for adjusting the distance between the pair of triangular frames, the welding gap can be easily adjusted. In addition, by providing the return shaft at the pivotal connection to the arm plate that constitutes one side of one of the triangular frames, an effect that enables higher centering adjustment can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view of a pipe connection jig according to an embodiment.

FIG. 2 is a developed plan view of the pipe connection jig.

FIG. 3 is an exploded perspective view and an assembled perspective view of a pipe connection jig according to another example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Piping connection jig 12 (12R, 12L) Triangular frame 14 (14A, 14B, 14C) Common shaft 14Bd Eccentric shaft 16 (16X, 16Y, 16Z) Arm plate 18 Hinge sleeve 18Yd Eccentric hole 20 Target piping 21 Angle section 22 Inclined surface portion 24 Pipe seat 28 Tightening screw 30 Screw hole 32 Insertion hole 34 Large diameter portion 36 Fixed nut 38 Compression spring means 40 Gap adjusting nut 42 Eccentric shaft head 44 Insertion hole

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B23K 37/053 B23K 9/028 F16L 1/10

Claims (2)

(57) [Claims] 1. A pipe connection jig used for pipe welding between pipe units, wherein a pair of triangular frames capable of enclosing pipes are provided via a common shaft disposed at a vertex of the triangular frame. the result as possible Tsutsumigi by the triangular frame of each pipe comrades to be connected, set the depressible fastening means an outer surface of the pipe which is Tsutsumigi to the arm plates constituting the sides of the triangular frame
In addition, the common shaft has a distance between the pair of triangular frames.
A pipe connection jig provided with an adjusting means . 2. A pipe connection jig used for pipe welding between pipe units, wherein a pair of triangular frames capable of enclosing pipes are provided via a common shaft disposed at a vertex of the triangular frame. Thus, each of the pipes to be connected can be wrapped by the triangular frame, and an arm plate constituting a side of the triangular frame is provided with a fastening means capable of pressing an outer surface of the wrapped pipe, and A pipe connection jig, wherein a pivotal connection to an arm plate constituting one side of the frame is formed as an eccentric shaft.