JP7373888B2 - Pipe cutting device - Google Patents

Description

The present invention relates to a pipe cutting device for cutting metal or resin pipes along the longitudinal direction, which are used in chemical plants, nuclear power generation facilities, and the like.

In recent years, when disposing of pipes (mainly made of metal) that have been used for a long time, in chemical plants with pipes through which various chemicals flow, and nuclear power generation facilities with pipes through which cooling water containing residual radioactive materials flows, Investigations are being conducted to determine the degree of contamination and corrosion within the pipes. In order to conduct this investigation, a method is used to investigate the inside of the pipe or the cross section of the pipe, and in preparation for this, it is necessary to cut the pipe in half or into equal parts in the longitudinal direction (pipe axis direction). There is. Conventionally, methods for cutting pipes in the longitudinal direction include fusing methods using heat such as lasers and welding, and cutting methods using saw-shaped blades and various tools.

However, with fusing methods that utilize heat, high heat is generated in the processed area, which alters the quality of the chemical substances that adhere to the inside of the pipe, changing the degree of corrosion that should be investigated. there were. Further, in the fusing method such as welding, there is a problem in that molten material is scattered due to assist gas such as acetylene gas. Furthermore, in the cutting method using a tool or the like, there is a problem in that chips from the piping generated during the cutting process adhere to the inside of the piping, making it difficult to ascertain the exact state of the piping when investigating the contamination situation.

Therefore, several methods have been proposed for mechanically cutting piping mainly used in nuclear power generation facilities by pushing a cutting tool along the length of the piping. For example, Patent Document 1 discloses a pipe cutting device that uses a cutting tool with a blade to cut the upper part of the pipe, and presses the cut pipe at the lower part of the cutting tool to deform the pipe into a flat plate shape. has been done.

Furthermore, in Patent Document 2, one end of the piping is supported by a support member, and an arbitrary point in the longitudinal direction of the piping is supported by a guide plate, and a cutting tool is pulled into one end from the other end of the piping, thereby cutting a plurality of piping. A pipe cutting device for cutting pipes is disclosed.

Patent No. 4822058 Patent No. 6041831

However, since the pipe cutting device disclosed in Patent Document 1 deforms the cut pipe into a flat plate shape, various substances remaining on the inner surface of the pipe adhere to the cutting tool etc. during pressing. As a result, it is not possible to accurately measure the substance remaining on the inner surface of the pipe after it is cut. At the same time, since chemical substances and radioactive substances are accumulated in cutting tools, etc., it is necessary to clean (decontaminate) the chemical substances adhering to the cutting tools, etc. after cutting the pipe.

Further, in the pipe cutting device disclosed in Patent Document 2, the positional relationship between the cutting tool and the pipe supporting member just before the cutting is completed is not clearly shown. Therefore, when the material of the pipe is a metal material such as copper or lead, a problem arises in that when one end of the pipe is cut (the cutting is completed), the end face of the pipe is stretched and becomes burr-like. FIG. 14 shows a schematic diagram of burrs generated on the end face of a pipe (piping material) cut using a conventional pipe cutting device.

At the same time, the ends of the residue generated by cutting the pipe expand, and some of the residue gets caught in the gap between the cutting tool. Therefore, each time the pipe cutting process is completed, it is necessary to remove the residue stuck in the gap between the cutting tools from the gap between the cutting tools, and this removal work is a major hindrance to the cutting process. FIG. 15 shows a schematic diagram of the residual end portion (the end portion has expanded) that is generated after the completion of cutting the pipe.

Therefore, in the present invention, even if the material of the pipe is copper, lead, etc., which is more ductile than steel, it is possible to prevent the generation of burrs on the end face of the pipe that has been cut, and to remove the residue of the pipe after cutting. It is an object of the present invention to provide a pipe cutting device that reliably cuts pipes without causing the pipe to get caught in the gap of a cutting tool.

In order to solve the above-mentioned problems, the inventors of the present invention have conducted extensive research into the causes of burrs being generated on the end face of the pipe and residues being caught in the gaps of the cutting tool when the pipe is completely cut. The inventor of the present invention has surmised that the cause of this is that a portion of the pipe to be cut is not supported immediately before the pipe cutting process is completed.

In other words, if a part of the end face of the pipe that is to be cut is not supported when the pipe material is a ductile material such as copper, the residue (part of the pipe) generated by the pipe break and the pipe that is divided into multiple parts Ductile fracture occurs between the materials. As a result, separation progresses with the boundary between the residue and the piping material being stretched, and as a result, burrs are generated on the end faces of the pipe material being separated, and at the same time, the ends of the residue are spread out and the piping is separated. The cutting will be completed.

Therefore, the present inventor thought that the above-mentioned problem could be solved by continuing to movably support the end face of the pipe to be cut by the blade of the cutting tool (pipe cutting jig) until the pipe cutting is completed. .

Therefore, the present invention provides at least a pipe cutting jig that has a plurality of blades and cuts the pipe along the longitudinal direction from one end of the pipe to the other end, and a pipe cutting jig that cuts the pipe along the longitudinal direction from one end of the pipe to the other end. It has a propulsion means that propels the pipe along the longitudinal direction, and a pipe end restraint means that restrains the other end of the pipe, and the pipe end restraint means includes a pipe support that movably supports the end surface of the pipe. The structure is equipped with parts.

This pipe support member is provided with at least a pipe support surface that supports the end face of the pipe to be cut, and a blade support surface that supports the blade of the pipe cutting jig. In this case, the pipe support surface may be provided in a direction perpendicular to the longitudinal direction of the pipe. Further, the blade support surface may be inclined at a predetermined angle with respect to the longitudinal direction of the pipe. By configuring the pipe cutting device of the present invention as described above, the end face of the pipe, especially the boundary between the residue generated by the blade of the pipe cutting jig and the part of the pipe to be split, is supported until the pipe cutting is completed. Continue to do so.

The pipe cutting device according to the present invention includes a pipe support member that movably supports the end surface of the pipe in the pipe end restraining means that restrains the other end of the pipe, so that the pipe cutting device can be used until just before the pipe cutting is completed. Since it continues to support the boundary between the residue (generated by the blade of the pipe cutting jig) and the pipe to be divided, it does not generate burrs on the end surface of the pipe to be cut, and the end of the pipe deforms and cuts. This has the effect of preventing residue from getting caught in the gap between the tools.

FIG. 2 is a perspective view showing the vicinity of a pipe end restraining means 30B constituting the pipe cutting device 100 of the present invention. FIG. 1 is a perspective view showing the vicinity of a pipe cutting jig 10 that constitutes a pipe cutting device 100 of the present invention. FIG. 2 is a perspective view of a pipe end restraint means 30B (first embodiment) shown in FIG. 1. FIG. FIG. 4 is a perspective view showing a state in which the end of the pipe P1 is restrained by the pipe end restraining means 30B shown in FIG. 3. FIG. FIG. 4 is a schematic front view of the pipe end restraining means 30B shown in FIG. 3. FIG. It is a schematic plan view of 30 A of piping end restraint means of 2nd Embodiment. FIG. 7 is a view taken along arrow A of the pipe end restraint means 30A shown in FIG. 6; FIG. 7 is a view taken along arrow B of the pipe end restraint means 30A shown in FIG. 6; 6 is a simulation diagram (before the start of cutting) of the cutting process of the pipe P2 using the pipe end restraining means 30B shown in FIG. 5. FIG. FIG. 6 is a simulation diagram (during cutting) of a cutting process of the pipe P2 using the pipe end restraining means 30B shown in FIG. 5; FIG. 6 is a simulation diagram (during cutting) of a cutting process of the pipe P2 using the pipe end restraining means 30B shown in FIG. 5; FIG. 6 is a simulation diagram (during cutting) of a cutting process of the pipe P2 using the pipe end restraining means 30B shown in FIG. 5; FIG. 6 is a simulation diagram (cutting completed) of a cutting process of the pipe P2 using the pipe end restraining means 30B shown in FIG. 5; FIG. 2 is a schematic diagram of burrs generated on the end face of a pipe cut by a conventional cutting device. FIG. 2 is a schematic diagram of a residual end portion generated after pipe cutting by a conventional cutting device.

Embodiments of a pipe cutting device according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the structure around a pipe end restraint means 30B (first embodiment) constituting a pipe cutting device 100 of the present invention, and FIG. 2 is a pipe cutting jig constituting the pipe cutting device 100 of the present invention. 10 is a perspective view showing the configuration around 10. FIG.

The pipe cutting device of the present invention can be roughly divided into a pipe cutting jig that cuts the pipe from one end (non-restricted side) to the other end (restricted side), and a pipe cutting jig that cuts the pipe in the longitudinal direction of the pipe ( It consists of a propulsion means for moving the piping along the tube axis direction, and a piping end restraining means for restraining the other end of the piping.

Note that the configuration of the pipe cutting jig 10 shown in FIG. 2 is the same as the configuration disclosed in Japanese Patent Application Laid-Open No. 2016-144858 by the same applicant as the present application. That is, the pipe cutting jig 10 includes a cutting tool 1 having a blade part 2 for cutting into the pipe material from the end surface of the pipe and a tapered part 3 for pushing the pipe material outward along the inner surface of the cut pipe.

Other components include struts 40a and 40b that serve to reliably move the pipe cutting jig 10 and propulsion means 20 shown in FIGS. 1 and 2 along the piping direction, hydraulic cylinders that act as the driving force for the propulsion means, and various There is a control panel (not shown), etc.

FIG. 3 is a perspective view of the pipe end restraint means 30B (first embodiment) shown in FIG. 1, and a perspective view of the end of the pipe P1 restrained using the pipe end restraint means 30B shown in FIG. 4 respectively. As shown in FIGS. 1 and 3, the pipe end restraining means 30B includes pipe end fixing members (claw members) 34a to 34d that fix the ends of the pipes on the cylindrical pedestal 39, and supports the ends of the pipes. Various parts such as piping support members 31 and 32 are attached with bolts. The two pipe support members 31 and 32 are fitted in such a manner that a part of each side surface is sandwiched between guide members 33a and 33b having a groove provided in the center.

FIG. 5 is a schematic front view of the pipe end restraint means 30B, which is simplified by removing the four pipe end fixing members (claw members) 34a to 34d shown in FIG. 1 from the pipe end restraint means 30B shown in FIG. Shown below. As shown in FIG. 5, four springs 35e to 35h are built into the grooves of the guide members 33a and 33b constituting the pipe end restraining means 30B. These springs 35e to 35h allow the pipe support members 31 and 32 to move in the radial direction along the grooves of the guide members 33a and 33b.

The radial movable range of the pipe support members 31 and 32 is limited by the first stopper member 36 and the second stopper members 37c and 37d, as shown in FIG. That is, by installing the first stopper member 36 at the center of the pedestal 39 (on one end side of the guide members 33a, 33b), the movement of the pipe support members 31, 32 in the inward direction is restricted. On the other hand, by installing second stopper members 37c and 37d on the outer peripheral side of the pedestal 39 (the other end side of the guide members 33a and 33b), the outward movement of the pipe support members 31 and 32 is restricted. As shown in FIG. 5, the pipe support members 31 and 32 include pipe support surfaces 31a and 32a that support the end surfaces of the pipes when the pipes are fixed with the pipe end restraining means 30B, and pipe cutting jig that is responsible for cutting the pipes. It includes blade support surfaces 31b and 32b that support the blade of the tool.

Next, configurations of different types of pipe end restraining means will be explained using the drawings. FIG. 6 shows a schematic plan view of the pipe end restraint means 30A of the second embodiment, FIG. 7 shows a view from arrow A of the pipe end restraint means 30A shown in FIG. 6, and FIG. The arrow views are shown in FIG. 8. A pipe end restraining means 30A of the second embodiment shown in FIG. 6 has the same configuration except for the form of the second stopper members 37a and 37b. That is, in the pipe end restraining means 30A, pipe end fixing members (claw members) 34a to 34d for fixing the end of the pipe are arranged evenly on a disc-shaped pedestal 39, and the first stopper member 36 is the center. Two pipe support members 31 and 32 are installed to face each other.

In addition to the first and second stopper members 36, 37a, 37b, two guide members 33a, 33b and springs 35 (35a to 37b) are installed around the two pipe support members 31, 32 as shown in FIG. 35d) is provided. In addition, the pipe support members 31 and 32 include pipe support surfaces 31a and 32a that support the end surfaces of the pipes, as in the case of the first embodiment shown in FIG. Blade support surfaces 31b and 32b are formed to support the blade. Note that FIGS. 7 and 8 are illustrated (simplified) with the four pipe end fixing members (claw members) 34a to 34d shown in FIG. 6 removed.

A series of steps in which pipes are simulated to be cut using the pipe end restraining means constituting the pipe cutting device of the present invention will be described with reference to the drawings. In this simulation, the cutting state is simulated from the start of cutting to the end of cutting when the pipe cutting jig (cutting tool) is moved along the pipe with one end of the pipe restrained by the pipe end restraining means 30B shown in Fig. 1 ( mock experiment). The state before the start of cutting in the simulation of the main cutting process is shown in FIG. 9, the state during cutting is shown in FIGS. 10 to 12, and the state at the time of completion of cutting is shown in FIG. 13, respectively.

First, the test conditions for this simulation will be explained using FIG. 9. Simulated cutting is started with one end of the pipe P2 restrained using the pipe end restraining means 30B that constitutes a part of the pipe cutting apparatus of the present invention. The structure of the pipe end restraining means 30B is the same as that shown in FIG. 5, and the end surface of the pipe P2 is supported by the pipe support surfaces 31a and 32a of the pipe support members 31 and 32. Further, the outer circumferential surface of the pipe P2 is fixed by four pipe end fixing members (claw members) 34a to 34d (not shown in FIG. 9) as in the case shown in FIG.

After one end of the pipe P2 is restrained by the pipe end restraining means 30B, the pipe cutting process is started by moving the pipe cutting jig 10 from the top to the bottom of the drawing. 10 shows the initial stage of the cutting process, FIG. 11 shows the middle stage of the cutting process, and FIG. 12 shows the position of the pipe cutting jig 10 and the cutting state (cross-sectional view) of the pipe P2 at the final stage of the cutting process.

At any stage shown in FIGS. 10 to 12, it can be seen that the pipe P2 is being cut along the inclined surface of the blade portion 2 of the pipe cutting jig 10. In particular, at the final stage of the cutting process, as shown in FIG. The end faces of the pipes are supported by pipe support surfaces 31a and 32a.

From the final stage of the cutting process shown in FIG. 12, the pipe cutting jig 10 further moves toward the pipe P2 side (downward in the drawing), thereby completing a series of cutting processes. FIG. 13 shows the state of the pipe cutting jig 10, the pipe P2, etc. at the time of completion of cutting. When the pipe cutting jig 10 moves further downward from the final stage of the cutting process shown in FIG. 12, the pipe support members 31 and 32 receive a lateral force via the blade support surfaces 31b and 32b. As a result, the pipe support members 31 and 32 separate from the first stopper member 36 located at the center of the pipe end restraining means 30B. On the other hand, along with the lateral movement of the pipe support members 31 and 32, the pipe P2 that has been completely cut and the residue generated by the completion of the cut also move in the radial direction of the pipe P2.

However, since the pipe support members 31 and 32 provided in the pipe end restraining means 30B of this embodiment movably support the end face of the pipe P2 by the four springs 35, even after the cutting is completed, As shown in FIG. 13, the pipe P2 and its residue can be continuously supported by the pipe support surfaces 31a and 32a. Therefore, burrs and burrs are not generated on the end surface of the pipe P2 to be cut, and it is also possible to prevent the pipe after cutting and its residue from adhering to the pipe cutting jig (cutting tool).

Therefore, the pipe cutting device of the present invention reliably pushes the pipe cutting jig with the blade into the pipe material, and at the same time completely removes the pipe material that has been cut into multiple pieces and the band-shaped residue generated by the cutting. This makes it easy to separate.

This makes it possible to axially cut not only piping materials such as copper and lead, but also high-strength materials such as non-ferrous metals and steel-based materials. Moreover, the present invention is not limited to cutting pipes when disposing of pipes in chemical factories, etc., but has a very useful effect when cutting and reusing pipes.

1 Cutting tool 2 Blade portion 3 Tapered portion 10 Pipe cutting jig 20 Propulsion means 30A, 30B Pipe end restraint means 31, 32 Pipe support members 31a, 32a Pipe support surfaces 31b, 32b Blade portion support surfaces 33a, 33b Guide member 34a~ 34d Piping end fixing member (claw member)
35 (35a to 35h) Spring 36 First stopper member 37a to 37d Second stopper member 39 Pedestal 40a, 40b Support column 100 Pipe cutting device P1, P2 Piping

Claims (2)

At least a pipe cutting jig that has a plurality of blades and cuts the pipe along the longitudinal direction from one end of the pipe to the other end; and a pipe end restraint means for restraining the other end of the pipe, the pipe end restraint means being a pipe support member movably supporting the end surface of the pipe in a radial direction. The pipe support member has at least a pipe support surface that supports the end surface of the pipe, and a blade support surface that supports the blade of the pipe cutting jig in the final stage of the cutting process . A pipe cutting device characterized by being provided. The pipe support surface is provided in a direction perpendicular to the longitudinal direction of the pipe, and the blade support surface is provided inclined at a predetermined angle with respect to the longitudinal direction of the pipe. The pipe cutting device according to claim 1 , characterized in that:

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