JP2000094356A - Extending tool for distance between pipe connected by loose flange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extending tool for the distance between pipes, capable of reliably changing a packing even in a case where the pipes are connected to each other by a loose flange. SOLUTION: An extending tool is composed of a pair of front and rear clamps C, C for pinching both front and rear pipes P, P by boosting force of screws, and a pair of right and left propulsion screws 5, 5 for equally extending the distance between both clamps C, C. Both clamps C, C are formed of a pair of fixed frames 1, 2 for pinching pipes P, V-shaped bent recessed surfaces 14 are formed on respective fixed frames 1, 2 so as to hold the pipes P, and slip preventing members 15 in relation to the pipes P are fixed on both upper and lower surfaces of the bent recessed surfaces 14. Screw holes 17 for the propulsion screws 5 are provided one of the fixed frames 1 and 2, and receiving holes 19 are provided on the other one.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expansion tool which is particularly devised for replacing packing between pipes connected by loose flanges.

[0002]

2. Description of the Related Art In large factories such as various plants,
As one of the maintenance management, the packing used for the connection of the piping is periodically replaced. As a procedure, first, the fastening bolts of both connection flanges are removed, and the space between the flanges sandwiching the packing is expanded. As this expanding means, an expanding tool between pipe flanges has been previously proposed (Japanese Patent Laid-Open No. Hei 7 (1994) -107).
-246570).

The unfolding tool is used by being hooked on a through hole of a bolt provided on a flange. The structure of the unfolding tool is mainly an inverted L-shaped grip frame having a horizontal piece at an upper end, and a lower end thereof. At the top, a support bolt as a hook that hooks into the bolt through hole of the flange is projected, the propulsion shaft of a male screw is vertically screwed into the horizontal piece at the upper end, and a wedge inserted between both flanges at the lower end of the propulsion shaft, at the upper end With the handle attached, the gap between the two flanges is expanded by the boost of the screw and wedge, use this tool to remove the packing from the expanded area, insert a new packing and replace it Can be. However, according to this tool, if the loose flange is a special one, the packing could not be replaced.

[0004]

As shown in FIGS. 1 and 4, the loose flange 30 is made of steel like a normal flange and has a thick shape. Is what you do. In other words, stainless steel pipes can be welded with the same metal flange, but the cost is high, and such a steel flange is a non-welded mounting method due to economic problems. Therefore, a lap joint 33 formed by bending the packing surface portion 35 sandwiching the packing 31 is welded to the pipe P,
The loose flange 30 is hung on it. In this state, when the two loose flanges 30, 30 are tightened with bolts, the packing 31 between the packing surface portions 35, 35 is formed.
Is tightened.

In the connection of such pipes by the loose flange, even if the space between the loose flanges is pushed and spread by the wedge of the tool, the spread does not reach the spread between the packing surface portions 35 and 35. Therefore, conventionally, when a loose flange is used, the packing is replaced by pulling out one pipe while applying a force in opposite directions so as to separate the pipes on both sides (every other) sandwiching one pipe. As a result, the work became large, the workability was poor and the work was not efficient. Also, insert the wedge deeply into the packing surface 3
If you cut between 5 and 35, lap joint 33
Is a thin and weak material, so that there is a problem that the packing surface portions 35, 35 are damaged by bending with a wedge.

Further, as shown in Japanese Utility Model Laid-Open No. 101778/1997, a flange removal tool is proposed, which is mounted straddling both pipes, applies force to both adjacent pipes to expand the gap between the flanges, and removes the packing. However, the fixing force to clamp both pipes is poor, and the force is poor due to the link mechanism that expands and expands, so it is useless for pipes in large plants where loose flanges are used. was there.

The present invention has been made in view of the above-described circumstances,
Since the fixing force for clamping the two adjacent pipes and the force for expanding between the two pipes depend on the boosting of the screws, they were connected by a loose flange that made it possible to reliably replace the packing even in large pipes. It was intended to provide an expansion tool between pipes.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a pair of front and rear clamps, each of which clamps both front and rear pipes connected by a loose flange with a boost of a screw, and a space between the two clamps. A spreading tool between pipes connected by a loose flange, comprising a plurality of propulsion screws that spread evenly, is constructed.

According to the above structure, when replacing the packing, the clamps are tightened to the two adjacent pipes, respectively, and the two clamps are expanded by the propulsion screws. The space between the packing surfaces is expanded, and the space between the two loose flanges is expanded accordingly, so that the packing can be replaced.

In the above case, if each of the clamps is composed of a pair of fixed frames sandwiching the pipe, and each fixed frame is formed with a curved concave surface so as to hold the pipe, the diameter of the pipe is reduced. It can be stably sandwiched regardless of the size of. Further, it is more effective to achieve the object if a non-slip member for the pipe is fixed to the upper and lower surfaces of the bent concave surface, and the space between the adjacent front and rear fixed frames is expanded by a propulsion screw.

[0011] Further, the fixed frame is composed of a vertical piece holding the pipe and a horizontal piece protruding from the middle of the vertical piece.
It is formed in the shape of a letter, so that it can pinch the pipe with the boost of the screw,
At the upper and lower ends of the vertical piece, through holes for tightening screws are provided so that nuts can be tightened, the screw holes for the propulsion screws are inserted into the horizontal pieces of one adjacent fixed frame, and the screw holes are inserted into the horizontal pieces of the other fixed frame. If a receiving hole into which the tip is inserted is provided, and a guide slope is formed around the receiving hole so as to fall into the receiving hole, the structure is simple and easy to handle.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the clamps C are not limited to the embodiments described below as long as the pipes P can be tightened and fixed to the pipes P by means of a screw boost. One and two may be connected openably and closably at one end, and the other end may be screwed. Further, a bolt having opposite ends at both ends, such as a turnbuckle, can be used as the tightening screw 3.

Further, in the embodiment, the clamps C, C are composed of the fixed frame 1 having the screw holes 17 and the fixed frame 2 having the receiving holes 19, but only one of them may be used. good. That is, one clamp C may be composed of the fixed frames 1 and 1, and the other clamp C may be composed of the fixed frames 2 and 2.

As for the propulsion screws 5 and 5, besides using bolts as in the embodiment, a reverse screw such as a turnbuckle can be used. Further, the rotating means may be rotated by a spanner or the like, or may be rotated by the handle 9. Since the space between the two pipes P, P is opened by the boost of the screws by the propulsion screws 5, 5, it is also possible to expand the space between the flanges (general flanges) integrally welded to the pipes to replace the packing. In this case, since the gap between the flanges is evenly opened, it is easy to replace the packing in this respect. In the receiving hole 19 of the propulsion screw 5, the guide slope 21 does not necessarily need to be provided on the entire circumference, but may be provided on the left and right.

[0015]

According to the present invention, as described above, the fixing force for clamping the two adjacent pipes and the force for expanding the space between the two pipes depend on the boosting force of the screw. In this case as well, there is an excellent effect that the gap between the loose flanges as well as between the two packing surface portions of the pipe can be expanded to efficiently and reliably replace the packing. In addition, stainless steel piping can be used safely without damaging the packing surface.

Each of the fixing frames of the two clamps has a bent concave surface in a "L" shape so as to hold the pipe, and a non-slip member for the pipe is fixed to the upper and lower surfaces of the bent concave surface. 2) The clamp can be securely fixed to the pipe regardless of the size of the pipe.

Also, through holes for tightening screws are provided at the upper and lower ends of the vertical piece of the fixed frame so as to be able to tighten nuts, and a screw hole for a propulsion screw is provided in a horizontal piece of one adjacent fixed frame, and the other fixed frame is provided. If a receiving hole into which the tip of the propulsion screw is inserted is provided in each of the lateral pieces (claim 3), the structure is simple and the handling is easy.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 to FIG. 3 show an embodiment, in which an unfolding tool T comprises a pair of front and rear clamps C, C which are fastened and fixed to both connecting pipes P, P, and the clamps C, C. A pair of left and right propulsion screws 5, 5 that expand between C and C
The clamp C is composed of a pair of left and right fixed frames 1 and 2 and fastening screws 3 and 3 for fastening the left and right fixed frames 1 and 2 up and down. Each of the tightening screws 3 has a nut 7 and each of the propulsion screws 5 has a handle 9.

The fixed frames 1 and 2 are T-shaped with a horizontal piece 12 protruding in the middle of the vertical piece 11 so that the middle part of the vertical piece 11 can stably hit the side surface of the pipe P. It is bent in the shape of a triangle, and through holes 13, 13 of the tightening screw 3 are formed at both ends. Further, plate-shaped non-slip members 15, 15 which are in contact with the pipe P are fixed to the upper and lower inner surfaces of the concave concave surface 14, and the fixed frames 1, 2 are provided with concave notches and dropped there. It is screwed with.

The fixed frames 1 and 2 have the above-mentioned structure.
A screw hole 17 of a female screw for screwing the propulsion screw 5 is provided at the tip of the lateral piece 12, and a receiving hole 19 for the propulsion screw 5 is provided on the other fixed frame 2. In this regard, the propulsion screw 5
Are rounded at the tip, and the receiving hole 19 is formed as a recess into which the tip fits, and a guide slope 21 inclined around the recess is formed around the recess. In addition, a hole 25 for passing the rod-shaped handle 9 is provided in the head of the propulsion screw 5 so that the screw can be rotated by the handle 9.

When using the above expanding tool T, first, the right and left fixed frames 1 and 2 of the clamps C and C are clamped and fixed by the upper and lower tightening screws 3 and 3 between the pipes P. Then, while pushing the propulsion screw 5 screwed into the one fixed frame 1 in the adjacent relation to the other fixed frame 2 and screwing it into the receiving hole 19, the two propulsion screws 5 and 5 are advanced. The two pipes P, P are pushed in opposite directions by the boost of the screw, and the space between the packing surface portions 35, 35 integral therewith and the loose flanges 30, 30 hooked to it are opened, respectively. The gasket 31 can be removed from the space, and a new gasket can be fitted.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an expansion tool between pipes connected by a loose flange according to the present invention.

FIG. 2 is a cross-sectional view showing a use state of the spread tool as viewed from a plane.

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

FIG. 4 is an explanatory diagram of piping using a loose flange.

[Explanation of symbols]

 C Clamp P Piping T Expanding tool 1, 2 Fixed frame 3 Tightening screw 5 Propulsion screw 11 Vertical piece 12 Horizontal piece 14 Refracted concave surface 15 Slip member 17 Screw hole 19 Receiving hole 21 Guide slope 30 Loose flange

Claims (3)

[Claims] 1. A pair of front and rear clamps respectively sandwiching both front and rear pipes connected by a loose flange with a boost of a screw, and a plurality of propulsion screws for evenly expanding between the two clamps. Opening tool between pipes connected by loose flanges. 2. The two clamps are composed of a pair of fixed frames sandwiching the pipe, and each fixed frame is formed with a bent concave surface so as to hold the pipe, and the upper and lower surfaces of the bent concave face are provided with a smoothness against the pipe. The expansion tool between pipes connected by a loose flange according to claim 1, wherein a stop member is fixed and the space between adjacent front and rear fixed frames is expanded by a propulsion screw. 3. A fixed frame is formed in a substantially T-shape comprising a vertical piece holding a pipe and a horizontal piece protruding from an intermediate portion thereof, and a vertical piece is provided so that the pipe can be sandwiched by a boost of a screw. At the upper and lower ends of the nut, through holes for tightening screws are provided so that nuts can be tightened. 3. The expansion tool between pipes connected by a loose flange according to claim 2, wherein guide holes are formed around the receiving holes so as to fall into the receiving holes.