JPS60238218A - Emergent cutting tool for piping - Google Patents

Abstract

PURPOSE:To secure the shielding effect for fluid by crushing and cutting a pipe by a receiving edge and a cutting edge which is moved reciprocatingly by a cylinder and at the same time by press-attaching and closing the edge of the cut pipe by a pressing body and a pressure receiving body. CONSTITUTION:When a pipe A is to be cut-off emergently, a connecting pin 45 is pulled-out and a turning arm 43 is turned, and the pipe A is introduced between the right and left arms 42, and the arm 43 is set to the original position. Then, a pressing body 51 and a pressure receiving body 52, and a cutting edge 61 and a receiving edge 62 are positioned so as to be set oppositely, holding the pipe therebetween. Then, the tool sets the cutting edge 61 and the receiving edge 62 on the upstream side from the gas leak side (a) and on the gas leak side (a). When a pressurizing lever 22 is moved for a main handle lever, a piston 32 advances, and the cutting edge 61 contacts with the pipe A and bites-in so as to cruch the periphery of the piped, and the pipe A is crushed. When the pipe is crushed to a prescribed position, a press-attached surface 51a is press-attached onto the periphery of the pipe, and the pipe A is crushed to a prescribed width. After cutting, the edge of the cut pipe is crushed, and the inner surface of the pipe is press-attached and the pipe edge is closed in sealed state.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an emergency piping shutoff tool for temporarily stopping the flow of gas, etc. flowing through the pipes, such as gas pipes and water pipes, in the event of a fire or gas leak accident, for example. [Prior art]

Conventionally, tools of this kind have been proposed, for example, in Japanese Utility Model Publication No. 5i-14160 or Japanese Utility Model Publication No. 5s-1989.
As seen in Japanese Patent No. 61690, etc., all of them are of the type in which the tube is crushed in the diametrical direction and closed by flat pressure. With this type of pipe, even though the desired water cutoff effect can be obtained when closing a water-conducting pipe made of a relatively soft material, #
In the case of a 4-tube gas pipe, the pipe body is difficult to deform plastically, so it is not only difficult to completely crush the pipe (closely blocking the inner surface of the pipe), but also dust etc. adhere to the inner surface of the pipe. In many cases, there is rust, and these impurities cause incomplete adhesion to the inner surface of the pipe, so fluid
The effect of blocking gas) was uncertain.

Purpose of the Invention 1 The present invention avoids the above-mentioned drawbacks, especially the drawback that if the pipe body is not simply flattened as has been done up to now, the fluid blocking effect is inevitably uncertain due to the above-mentioned reasons. To provide an improved piping emergency cutoff tool that can crush and cut a pipe and seal the cut end of the cut pipe to ensure a fluid cutoff effect. The purpose is to [Structure of the Invention] For this purpose, the present invention places a pressing body and a pressure receiving body in a V-spaced manner so as to sandwich the pipe to be shut off and approach each other in opposing positions orthogonal to the pipe axis in order to crush the pipe in the diametrical direction. A cutting blade for cutting the crushed pipe and a receiving blade are arranged to face each other, and a cutting blade for cutting the crushed pipe and a receiving blade are arranged to face each other, and the pressing body J5 and the cutting blade are set against the opposing pressure receiving body and the receiving blade. A reciprocating hydraulic or air cylinder is used to crush and cut the pipe with a cutting blade and receiving blade that are reciprocated by the cylinder, and at the same time, the end of the cut pipe is crimped and closed with a pressing body and a pressure receiving body. The invention is characterized in that it is configured to do so.

【Example】

Hereinafter, the present invention will be described in detail with reference to the drawings. No. 1
The figure shows the entire piping emergency shutoff tool. In the figure, 1 is the tool body with a hydraulic pressure generation mechanism inside, 2 is the operating handle part that operates the tool body 1 to generate pressure oil, and 3
1 is a hydraulic cylinder section that receives pressure oil from the go tool main body 1, and a blocking section 4 is formed on the piston protruding side of the hydraulic cylinder section 3. The tool body 1 has an oil chamber 11 inside. Pump room 1
2. A pressure oil chamber 13 is formed into sections, and oil is guided from the oil chamber 11 into the pressure oil chamber 13 by reciprocating motion of a plunger 14 provided in the pump chamber 12 and pressure is accumulated therein. Also, the pump chamber 12 is bypassed and the oil chamber 11 is transferred from the pressure oil chamber 13 to the oil chamber 11.
A return oil passage 15 is formed leading to the return oil passage 15, and this return oil passage 15 is equipped with an opening/closing valve 17 operated by a lever 1G, and when this valve is opened, the pressure oil is released. . The operating handle portion 2 also includes a main handle rod 21 extending with its end fixed to the tool body 1, and a pressure handle 22. The pressure handle 22 has a base end connected to a swing lever 22.
The force point part that performs a lever action is connected to the head of the plunger 14 by a pivot pin 24, and by swinging this, the plunger 14 performs a pumping movement. About 700k! 1/cm
It is designed to generate 2 types of pressure oil. In addition, the figure center mark @
Reference numeral 25 denotes a grip attached to the ends of the main handle rod 21 and the pressure handle 22. The hydraulic cylinder part 3 is connected and fixed to the tool body 1 via a connecting ring 34 that is fitted to the outer periphery of the base end of the cylinder 31 to prevent the number from being removed. The oil socket 33 communicates with the pressure oil chamber 13 of the tool body 1. In addition, a piston 32 having a bottomed cylindrical shape is housed inside the cylinder 31 (inside the cylinder 31).
- The diameter is set to 75 mm, so that it can handle the shutoff process of a gas pipe with a diameter of 75111I11. The piston 32 is housed so as to be normally contracted by a return spring 35, and a pressing body 5 of the piping cutoff section 4, which will be described later, is attached to the protruding end surface of the piston 32.
A small diameter shaft portion 37 having a ring groove 36 for fixing the
is installed protrudingly. The piping cutoff section 4 has a support ring 41 that is fixedly fitted onto the outer periphery of the end of the cylinder 31, and the support ring 41 has a circumference of 2 as shown in FIG. A pair of left and right arms 42.42 extending parallel to the direction of extension of the piston 32 is protruded at the location, and a pair of left and right arms 42.42 is provided at the ends of the arms 42. A rotating arm 43 is installed. One end of the rotating arm 43 is rotatably connected to the end of the arm 42 by a pivot 44, and the other end is connected to the end of the other arm 42 by a connecting pin 45 that can be inserted and removed. It is removably fixed to the connecting bin 45.
When handled, the rotating arm 43 rotates about the pivot 44 as shown in FIG. The pipe A to be shut off can be introduced. As shown in FIG. 2, the connecting bin 45 is provided with a click bin 47 to prevent accidental removal. - In the space surrounded by the left and right arms 42, 42 and the rotating arm 43, a pipe A is flattened at an opposite position perpendicular to the pipe axis with the liquid cutoff pipe introduced into the space sandwiched therebetween. A pressing body 51 and a pressure receiving body 52 are provided as pressure bonding members that are crushed. The suppressor 51 is directly fixed to the end face of the piston 32 via a small diameter shaft portion 37 which is provided to protrude from the projecting end face of the piston 32, and the set screw 38 is fitted into the ring groove 36 of the small diameter shaft portion 37. By doing so, the handling is stopped (see Figure 3). Further, the pressure receiving body 52 is integrally formed inside the rotating arm 43 so as to oppose the pressing body 51, and the pressure bonding surfaces 51a and 52a on the opposing surfaces of the pressing body 51 and the pressure receiving body 52 are as follows. Each is formed with a wave-shaped cross section. and pressing body 5
1 is reciprocated so as to approach and separate from the pressure receiving body 52 by the expansion and contraction movement of the piston 32. In order to smoothly perform this reciprocating movement, the pressing body 51 has both longitudinal ends connected to the arms 42. It is slidably and loosely fitted into guide grooves 46 and 46 formed on the opposing inner surface of the .42. Further, each of the pressing body 51 and the pressure receiving body 52 has a
A cutting blade 61 and a receiving blade 62 for cutting the pipe A to be shut off are fixed to the side surface by bolts 63 and 64, respectively. The cutting blade 61 is fixed to the side surface of the pressing body 51 along the longitudinal direction thereof,
The blade edge is formed in a V-shape to prevent the pipe to be shut off from sliding sideways, and the blade surface 61a is the crimping surface 5 of the pressing body 51.
It is smaller in the advancing direction than 1a (both have a mounting number that protrudes more than twice the wall thickness of the pipe A to be shut off). Further, the receiving blade 62 has a blade surface 62a that is in the same plane as the crimp surface 52a of the pressure receiving body 52, and is fixed to the side surface of the pressure receiving body 52 along the longitudinal direction. The receiving blade 62 constitutes a pipe cutting member. Next, we will show an example of how to use the piping emergency cutoff tool with the above configuration.
A gas pipe with a gas leak will be described as a pipe A to be shut off. When shutting off pipe A in an emergency, J: first removes the connecting bottle 45, rotates the rotating arm 43 as shown in Fig. 2, introduces pipe A between the left and right arms 42, 42, and after introducing If the movable arm 43 is set in its original state (as shown in FIG.
and the receiving blade 62 are positioned so as to face each other with the pipe A in between. At the time of this setting, the tool is located upstream of the side a where the gas leak is occurring with respect to the pipe A, and as shown in Fig. A cutting blade 61. Set so that the receiving blade 62 is positioned. In this let state, when the pressure lever 22 is pumped against the main handle rod 21, the plunger 14 is actuated and C pressurized oil is supplied to the sweat cylinder section 3, and the piston 32 advances due to the action of the pressure oil. do. This piston 32 is
Operating oil pressure up to 700! +/cm2 and the pressure receiving area is set to approximately 38cm2, so it advances with a maximum pushing force of 27 tons. With the advance of this piston 32, the fifth
As shown in FIG.
First, the cutting blade 61 presses into the circumferential surface of the pipe. At this time, the edge of the cutting blade 61 is formed in a V-shape to prevent it from sliding sideways into the pipe, while the pipe A is crushed, and the cutting blade 61 moves the pipe A to a predetermined position.
When the crimping surface 51a of the pressing body 51 is pressed against the pipe surface, the pressing body 51 presses the arm 42.42.
By advancing along the guide groove 4G, the crimping surface 5
The pipe A held between 1a and the crimp portion 52a of the pressure receiving body 52 is flattened over a predetermined width. When the pipe A is crushed to a predetermined flat state, the blade surface of the cutting blade 61 reaches the blade surface position of the receiving blade 62, and the pipe A is cut into a pressed shape by the cutting blade 61 and the receiving blade 62. Ru. After this cutting, the cut tube end is further pressed by a pressing body 5.
1 and the pressure receiving body 52, the end of the cut pipe is strongly crushed and the inner surface of the pipe becomes the crimping surface 51a.
, completely crimped by being crushed by the wave-shaped cross section along 52a,
The tube end is hermetically closed (see Figure 7). When the pipe is completely shut off, the pressure oil return lever 1'6 provided on the tool body 1 side is operated to allow the pressure oil in the cylinder 31 to flow into the oil chamber 11 side. As a result, the pressure oil is released, and the piston 32 is contracted into the cylinder 31 by the return spring 35, and the pressing body 51
The clamping state of the pipe A between the pressure receiving body 52 and the pressure receiving body 52 is released. Then remove the tool from the end of the cut pipe to complete the emergency shutoff of pipe A. For gas piping that has been crimped and closed upstream of the leakage point a, it is preferable to seal the end of the cut pipe in order to ensure the gas-blocking effect. A cap B made of synthetic rubber is placed on the end of the cut tube via an adhesive made of 1del rubber or the like (see FIG. 8). Due to the sealing process with cap B, a gap may be created on the crimp surface that goes down to the end of the cut tube due to the presence of foreign matter such as dust or rust that adheres to the inner surface of the tube. In addition to being able to reliably prevent eruptions,
Furthermore, even after the cut area is backfilled, groundwater will not infiltrate into the pipe from the end of the cut pipe, resulting in major advantages such as preventing recurrence of gas leak accidents due to corrosion at the end of the cut pipe. . In the above embodiment, a manual oil pump is provided.
[Emergency Shutdown of Piping]: Although the equipment has been described, the hydraulic cylinder section may be replaced with an air cylinder, and the present invention also applies to a type that receives pressure oil supply from an external oil pump driven by power. [Advantageous Effects of the Invention 1] As explained above, according to the present invention, in order to urgently shut off installed pipes such as gas pipes, the blocked part of the pipe is crushed and cut, and at the same time, the end of the cut pipe is Since the crimping is made so that there is a gap between the crimps, the following effects can be obtained: ■ The closed part of the pipe is easily deformed by the crimping by cutting the pipe, so it is difficult to deform plastically. Even in the case of pipes, the pipes can be reliably closed by crimping so that the inner surfaces of the pipes are in close contact with each other, and the fluid blocking effect can be ensured. It is now possible to seal the end of the pipe with a cap, etc., and this sealing process can remove dust or chains that have formed on the inner surface of the pipe to be closed. Even if there is a gap between the crimped surface and the crimped surface at the end of the cut tube, the gas will not blow out and the fluid barrier effect will be further ensured. ■Additional sealing treatment 1. When the blocked part of the pipe (cut pipe end) is backfilled underground after the blockage, 1.
: Since surface water does not enter the pipe from the end of the cut, it has the advantage of preventing recurrence of gas leak accidents (due to corrosion at the end of the cut pipe).

[Brief explanation of the drawing]

Fig. 1 is an overall side view showing an embodiment of the present invention with a part cut away, Fig. 2 is a perspective view of the main part, and Fig. 3 is a front view showing the main part with a part cut away. FIG. 4 is a bottom view partially showing the main part in cross section, and FIGS. 5 to 8 are explanatory diagrams of the operation. 1... Tool body, 11... Oil chamber, 12... Pump' chamber, 13...
・Pressure oil chamber, 14...Plunger, 15...Return oil path, 16...Lever, 11...Opening/closing valve, 2...Operation handle part, 21...Main handle rod, 22...・・Pressure handle, 2
3... Swing lever, 24... Pivot pin, 25...
Grip, 3... Hydraulic cylinder part, 31... Cylinder, 32... Piston, 33...
Pressure oil socket, 34... Connection ring, 35... Return spring, 36... Ring groove, 31... Small diameter shaft portion, 4... Piping cutoff part 41... Support ring, 42... ...Arm, 43...
Rotating arm, 44... Pivot, 45... Connection bin, 4
G guide groove, 47... Click bin, 51... Pressing body, 52... Pressure receiving body, 61... Cutting blade, 62... Receiving blade, A... Pipe to be shut off, B... ·cap. Figure 3: Mr. Kazuo Wakasugi, Commissioner of the Patent Office 1. Indication of the case - Patent Application No. 092171 of 1982 2, Name of the invention Plumbing Emergency Shutoff Tool 3, Person making the amendment Relationship to the case Patent Applicant 1-5-20-20 Kaigan 1-chome, Minato-ku, Tokyo 4, Agent Person 5, All drawings to be corrected 6, What are the contents of the drawings to be corrected? ! Book II (no changes in content)

Claims (1)

[Claims] A pressing body and a pressure receiving body are placed facing each other at opposing positions orthogonal to the pipe to be shut off and are close to each other in order to crush the pipe in the diametrical direction. A hydraulic or air cylinder is provided, in which a cutting blade and a receiving blade for cutting the crushed pipe are arranged opposite to each other, and the pressing body and the cutting blade are reciprocated relative to the opposing pressure receiving body and receiving blade. The pipe is crushed and cut by a cutting blade and a receiving blade reciprocated by the cylinder, and at the same time, the end of the cutting pipe is crimped and closed by a pressing body and a pressure receiving body. Piping emergency shutoff tool.