JP2004322264A - Working device and working method of outer periphery of pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To apply work such as cutting work along the outer periphery of a pipe without requiring large motive power by a device having a simple constitution. <P>SOLUTION: This working device has a guide ring 12 installed on the outer periphery of a working object pipe 1, and also has a hand held power tool 16 positioned in the pipe axis direction by being guided by the guide ring 12, wherein the work is applied to the outer periphery of the pipe 1 in a state of being movable in the pipe peripheral direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a processing apparatus and a processing method for the outer periphery of a pipe.
[0002]
[Prior art]
When laying a pipeline, it is often necessary to cut a cast iron pipe to a predetermined length at the laying site. In such a case, a cutting process using a grindstone is usually performed using a hand-held engine cutter.
[0003]
On the other hand, when forming, for example, an earthquake-resistant pipe among the cast iron pipes constituting the pipeline by the above-described cut pipe, it is necessary to form a protruding portion on the outer periphery of the cut end. After that, it is necessary to perform a grooving process for fitting the protruding member. In addition, it is necessary to perform these cutting and grooving precisely.
[0004]
However, since the above-mentioned hand-held engine cutter rotates the cutter using a small displacement gasoline engine or the like as a power source, it has a considerable weight and is accompanied by vibration. Positioning is difficult and precise processing is not possible.
[0005]
On the other hand, when performing cutting at the site where the cast iron pipe is laid, a guide ring is provided on the outer periphery of the pipe, and by using a cutting device that travels along the guide ring, it is possible to perform precise processing. The above-mentioned method is known from, for example, Patent Document 1.
[0006]
The apparatus described in Patent Document 1 has a cutting machine body configured to run along a guide ring mounted on the outer periphery of a pipe as described above, and one end and the other end connected to the cutting machine body. And a roller-mounted chain arranged so as to be wound around the outer periphery of the tube. The cutting machine body is guided by the guide ring in a state in which the cutter chain is prevented from falling off from the outer periphery of the pipe, and moves along the circumferential direction of the pipe together with the roller chain. Is severable.
[0007]
[Patent Document 1]
JP-A-8-323532
[Problems to be solved by the invention]
However, in such a conventional configuration, the cutting machine body is a self-propelled structure that can move along the outer circumference of the pipe, so that the power for the self-propelling is used in addition to the power for the original cutting. And a configuration for self-propulsion other than power is also required. In addition, a chain with rollers for preventing the cutting machine body from falling off the outer periphery of the pipe is required separately from the cutting machine body. Therefore, in such a conventional configuration, it is inevitable that the device becomes complicated. In addition, not only the cutting machine body, but also a chain with a long roller arranged to be wound around the outer circumference of the pipe must be moved along the outer circumference of the pipe together with the cutting machine main body. Power is needed.
[0009]
Therefore, the present invention solves such a problem, and can perform a process such as a cutting process along the outer periphery of a pipe precisely by using a device having a simple structure and without requiring large power. The purpose is to.
[0010]
[Means for Solving the Problems]
In order to achieve this object, a pipe peripheral processing apparatus according to the present invention includes a guide ring mounted on the outer periphery of a pipe to be processed, and is guided in the guide ring to be positioned in the pipe axis direction and to be positioned in the pipe peripheral direction. And a hand-held power tool capable of processing the outer periphery of the pipe while being movable in the direction.
[0011]
In the method for processing the outer circumference of a pipe according to the present invention, a guide ring is mounted on the outer circumference of a pipe to be processed, and by being guided by the guide ring, the pipe can be moved in the pipe circumferential direction while being positioned in the pipe axial direction. The outer circumference of the pipe is machined by the hand-held power tool.
[0012]
Therefore, according to the present invention, since the outer periphery of the pipe is merely processed by a hand-held power tool which is movable in the pipe circumferential direction while being positioned in the pipe axial direction by the guide ring, its structure is Since it is not complicated and only uses a hand-held power tool, the circumferential feeding of the pipe can be easily performed by human power, thus eliminating the need for a large power for it. And the use of a guide ring enables precise processing.
[0013]
Further, the method of forming the insertion opening projection of the pipe according to the present invention includes forming the annular groove on the outer periphery of the insertion opening of the tube by the above-described method, and connecting the annular projection of the insertion ring having the annular projection on the inner circumference with the annular groove. The insertion ring is fitted to the insertion hole with the insertion ring fitted, and the insertion ring is fixed to the insertion hole.
[0014]
Therefore, with the annular projection formed in the annular groove formed on the outer periphery of the tube opening with a simple device, the insertion ring is fitted to the insertion hole and fixed to the insertion hole. The insertion projection can be easily formed.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 3, reference numeral 1 denotes a pipe to be processed, which is formed of ductile cast iron or the like. An annular groove 2 having a rectangular cross section as shown in FIG.
[0016]
1 to 3, reference numeral 11 denotes an apparatus for processing the outer periphery of a first pipe according to the present invention. As shown in the drawing, a guide ring 12 having a rectangular cross section is mounted on the outer periphery of the pipe 1 near the position where the annular groove 2 is to be machined. The guide ring 12 is formed of a metal material and is formed of a member continuous in the circumferential direction or a member divided into an appropriate number along the circumferential direction. For example, as shown in FIG. A threaded portion 14 is embedded in the ring 12 and is screwed radially inward from the guide ring 12, and its tip is fixed to the tube 1 by a set screw 15 pressing the screen of the tube 1. .
[0017]
Reference numeral 16 denotes a hand-held power tool, which utilizes a so-called hand grinder, and includes a main body portion 17 having a built-in electric motor, and a handle 18 for an operator to hold the power tool 16 by hand during machining operation. In addition, a processing tool 19 such as a processing blade or a grindstone having a shape and a size corresponding to the annular groove 2 to be processed is attached to the rotating shaft.
[0018]
A stopper 20 formed of a metal plate or the like is mounted on the rotary shaft of the power tool coaxially in a non-rotating state at a position close to the processing tool 19. The stopper 20 is formed, for example, in a disk shape smaller in diameter than the processing tool 19, and when the power tool 16 is pressed against the pipe 1 for processing the annular groove 2, the outer peripheral surface 21 contacts the outer surface 3 of the pipe 1. Thus, the cutting depth of the processing tool 19 can be made constant.
[0019]
The power tool 16 is provided with a cover 22 made of a metal plate that covers most of the processing tool 19 except for the processing location for preventing danger. A metal guide plate 23 is attached to a portion of the opening end of the cover 22 corresponding to the processing location by welding or the like. The guide plate 23 is formed so as to be curved so as to contact the outer surface 3 of the tube 1. When the guide plate 23 contacts the outer surface 3 of the tube 1, the axis of the processing tool 19 is parallel to the axis of the tube 1. It is configured to be.
[0020]
A positioning guide 24 is attached to the cover 22 and the guide plate 23 by welding or the like. The positioning guide 24 is formed of a metal material to have an F-shaped cross section, and is capable of sandwiching the guide ring 12 from both sides thereof. It is configured so that it can be positioned in the center direction. The positioning guide 24 is slidable along the guide ring 12 in the circumferential direction of the tube 1, so that the power tool 16 is positioned at a fixed position in the axial direction of the tube 1, The tube 1 is configured to be movable in the direction, that is, to be able to feed in the circumferential direction of the tube 1.
[0021]
FIG. 4 shows a processing device 31 for the outer periphery of a second pipe according to the present invention. As shown in FIGS. 1 to 3, the processing device 31 cuts the pipe 1 on which the annular groove 2 has been processed by the processing device 11 at a position at a certain distance from the annular groove 2. In order to obtain a tube of a predetermined length having an annular groove 2.
[0022]
In this processing apparatus 31, reference numeral 32 denotes a hand-held power tool, reference numeral 33 denotes a main body thereof, reference numeral 34 denotes a handle thereof, which have the same configuration as that shown in FIGS. Reference numeral 35 denotes a rotary processing tool, which is formed to have a diameter that allows cutting to be performed through the wall of the tube 1. A cover 36 covers the processing tool 35. Reference numeral 37 denotes a guide plate, which has a curved configuration like the guide plate 23, and is similarly attached to the opening end of the cover 36 by welding or the like. As shown, the guide plate 37 and the processing tool 35 are provided in a positional relationship such that the processing tool 35 penetrates the wall of the pipe 1 when the guide plate 37 contacts the outer surface of the pipe 1. Reference numeral 38 denotes a positioning guide, which has a sandwiching portion 39 capable of sandwiching the guide ring 12 from both sides thereof, and a stay 40 for connecting the sandwiching portion 39 and the cover 36. The stay 40 is configured such that the distance from the guide ring 12 to the processing tool 35 is longer than the distance from the guide ring 12 to the annular groove 2, whereby the tube 1 having the annular groove 2 is formed. It is configured to be cut to a predetermined length. The positioning guide 38 is slidable in the circumferential direction of the pipe 1 along the guide ring 12, whereby the power tool 32 is positioned at a predetermined distance from the annular groove 2 in the pipe axis direction. Is provided so that feed in the circumferential direction of the pipe 1 can be provided.
[0023]
Next, an operation of forming the annular groove 2 in the pipe 1 to be processed by using the processing device 11 and cutting the pipe 1 at a position at a predetermined distance from the annular groove 2 by using the processing device 31 will be described. . Such processing of the annular groove 2 and cutting of the pipe 1 is an operation necessary when cutting an earthquake-resistant pipe at a site where a pipe is laid.
[0024]
First, as shown in FIG. 2, the guide ring 12 is attached to the pipe 1 at a position at a predetermined distance from a position where the annular groove 2 is to be formed. Next, as shown in FIGS. 1 to 3, the processing apparatus 11 is prepared, and the guide ring 12 is sandwiched by the positioning guide 24 based on a manual operation of an operator. As a result, the processing tool 19 is positioned in the axial direction of the pipe 1 with a certain distance from the guide ring 12.
[0025]
Then, when the power tool 16 rotates the processing tool 19, the wall of the outer surface 3 of the pipe 1 is processed by the processing tool 19 based on the manual operation of the operator, and the processing depth gradually increases. When the processing depth reaches a predetermined value, the stopper 20 comes into contact with the outer surface 3 of the pipe 1 and further cutting cannot be performed. At this time, since the stopper 20 is provided at a position close to the processing tool 19, the processing depth of the processing tool 19 can be accurately defined. At this time, the guide plate 23 also contacts the outer surface 3 of the tube 1.
[0026]
Next, the operator feeds the power tool 16 in the circumferential direction of the tube 1 while maintaining the state in which the guide plate 23 is in contact with the outer surface 3 of the tube 1. Then, as shown in FIGS. 1 and 3, the annular groove 2 is gradually formed along the circumferential direction of the pipe 1. At this time, since the positioning guide 24 sandwiches the guide ring 12 from both sides, the processing tool 19 is positioned in the axial direction of the pipe 1, and therefore, the annular groove 2 is formed at a predetermined position along the pipe axial direction. Can be. In order to feed the processing tool 19 in the circumferential direction of the pipe 1 while keeping the curved guide plate 23 in contact with the outer surface 3 of the pipe 1, the axis of the pipe 1 and the processing tool 19 are moved. The specified annular groove 2 corresponding to the shape and size of the processing tool 19 can be formed precisely while maintaining the state parallel to the axis. That is, when the guide plate 23 rises from the outer surface 3 of the pipe 1, the axis of the processing tool 19 is not parallel to the axis of the pipe 1, and therefore, the processing is performed with the processing tool 19 deviated from the predetermined posture. As a result, the annular groove 2 having a specified shape and size cannot be formed, but precise processing can be performed in a state where such a situation is prevented from occurring.
[0027]
By performing one round of processing along the circumferential direction of the pipe 1, the annular groove 2 can be formed in the circumferential direction. At this time, by giving a circumferential feed to the power tool 16 by a manual operation of the operator, the annular groove 2 can be formed over the entire circumference of the outer surface of the pipe 1 as shown in FIG. For this reason, it is not necessary to rotate the pipe 1 around its axis when forming the annular groove 2, and therefore, the annular groove 2 can be easily processed. This makes it possible, for example, to expose one end of a tube buried underground and to form an annular groove in the exposed part.
[0028]
When the annular groove 2 is formed, the positioning guide 24 is detached from the guide ring 12 to separate the processing device 11 from the pipe 1, and instead, a processing device 31 is prepared as shown in FIG. The guide ring 12 is sandwiched between them. In this state, the processing tool 35 is operated so that the processing tool 35 penetrates the wall of the tube 1 as shown in the figure, and the guide plate 37 is brought into contact with the outer surface 3 of the tube 1 over the entire circumference. The tube 1 is cut. At this time, the functions of the guide plate 37 and the positioning guide 38 are the same as those of the first processing device 11 shown in FIGS.
[0029]
When the pipe 1 is cut by the processing tool 35 as shown in FIG. 4, it is necessary to precisely position the pipe 1 in the pipe axis direction. Suffices, and it is not necessary to position the pipe very precisely in the radial direction as in the case of forming the annular groove 2. Therefore, unlike the first processing apparatus 11, it is not necessary to provide the stopper 20 close to the processing tool 19, and the processing tool 35 is roughly positioned in the pipe diameter direction by bringing the guide plate 37 into contact with the outer surface 3 of the pipe 1. Is enough.
[0030]
The guide plates 23 and 37 may be replaced with those having different degrees of curvature according to the diameter of the pipe, instead of being welded to the covers 22 and 36 as described above. it can. With such a configuration, it is possible to easily process pipes having different diameters.
[0031]
FIG. 4B shows the pipe 1 in a state where the annular groove 2 is precisely formed as described above and is cut at a predetermined position from the annular groove 2. With such a tube 1, a state in which the annular projection 52 on the inner periphery of the insertion ring 51 divided in the circumferential direction is fitted into the annular groove 2 as shown in FIG. By fitting the insertion ring 51 into the insertion hole 4 and fixing it, a seismic tube having an insertion projection can be easily manufactured.
[0032]
Next, the function of the outer peripheral projection 6 of the insertion opening 4 formed in this manner will be described. In FIG. 5, reference numeral 7 denotes a receptacle formed at the end of another pipe, and when the insertion port 4 is inserted into this receptacle 7, the pipes are joined to each other. The space between the receiving port 7 and the insertion port 4 is sealed by an annular sealing material 8 made of rubber. An annular metal lock ring 9 is disposed on the inner periphery of the receiving port 7, and the outer peripheral projection 6 of the insertion port 4 is larger than the locking ring 9 at the time of joining the receiving port 7 and the insertion port 4. Go into the back of 7. In this state, when a pull-out force is applied between the receiving port insertion holes, the outer peripheral projection 6 hits the lock ring 9 and the lock ring 9 hits the tapered surface 10 on the inner circumference of the receiving port 7. Of the insertion opening 4 can be prevented.
[0033]
【The invention's effect】
As described above, according to the present invention, the guide ring mounted on the outer periphery of the pipe to be processed, and the guide ring guides the guide ring so that it is positioned in the pipe axis direction and is movable in the pipe circumferential direction. And a hand-held power tool capable of processing the outer periphery of the pipe, so that the structure of the apparatus can be prevented from becoming complicated, and only a hand-held power tool is used. Therefore, the pipe can be easily fed in the circumferential direction by human power, so that large-scale power is not required, and precise processing can be performed by using a guide ring. It becomes.
[0034]
Further, according to the present invention, an annular groove is formed on the outer periphery of the insertion opening of the tube, and the insertion ring is inserted into the insertion groove in a state where the annular projection of the insertion ring having an annular protrusion on the inner periphery is fitted into the annular groove. Fit the insertion ring into the mouth, and then insert the insertion ring with a simple device with the annular projection fitted in the annular groove formed on the outer periphery of the insertion opening of the pipe in order to fix this insertion ring to the insertion opening. The insertion projection of the tube can be easily formed only by fitting the external fitting into the mouth and fixing the insertion opening.
[Brief description of the drawings]
FIG. 1 is a front view showing an apparatus for processing the outer periphery of a pipe according to an embodiment of the present invention.
FIG. 2 is a view showing a state of a cross section of a main part in FIG. 1;
FIG. 3 is an enlarged rear view of a portion shown in FIG. 1;
FIG. 4 is a diagram showing a processing apparatus for processing the outer periphery of a pipe according to another embodiment of the present invention.
FIG. 5 is a cross-sectional view showing a detachment prevention structure for a pipe having an outer periphery processed according to the present invention;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Work pipe 12 Guide ring 16 Power tool 19 Work tool 20 Stopper 23 Guide plate 24 Positioning guide

Claims (3)

A guide ring mounted on the outer circumference of the pipe to be processed, and the outer circumference of the pipe is processed while being guided in the guide ring and positioned in the pipe axis direction and movable in the pipe circumferential direction. And a hand-held power tool capable of operating the outer periphery of the pipe. A guide ring is attached to the outer periphery of the pipe to be processed, and the guide ring guides the pipe by a hand-held power tool that is movable in the pipe circumferential direction while being positioned in the pipe axis direction. A method for processing the outer circumference of a pipe, wherein the outer circumference is processed. An annular groove is formed on the outer periphery of the insertion opening of the pipe by the method according to claim 2, and the insertion ring having an annular protrusion on the inner periphery is fitted with the annular protrusion in the annular groove, and the insertion ring is removed. A method for forming an insertion projection of a pipe, wherein the insertion ring is fitted over the insertion opening, and the insertion ring is fixed to the insertion opening.

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