JP2002205218A - Pipe cutting device and pipe cutting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To be a light portable type and to effect cutting in a short time as much as possible. SOLUTION: A pipe cutting device being a portable type pipe cutting device 11 comprises a guide member 12 wound around the outer peripheral surface of a pipe P; a frame 13; a cutting mechanism 15 having a rotary blade 14 situated on the frame 13; a cross feed mechanism 16 to effect movement in a contact and separation state of the rotary blade 14 of the cutting mechanism 15 along a pipe axis; and a device 17 to feed a cutting agent for cooling to the rotary blade 14. The frame 13 pivotally supports a sprocket 13a, engaged with the guide member 12, and rotatable rolling roller 13b on the under surface side and is provided with a rotation mechanism 13c for the sprocket 13a. The frame 13 is movable through the rolling roller 13b over the outer peripheral surface of the pipe P along the guide member 12 through rotation of the sprocket 13a. Thus, even in a limited place, the pipe can be cut easily and in a short time as much as possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe cutting apparatus capable of cutting a steel pipe or a cast iron pipe at an arbitrary place with high accuracy and in a short time even in a narrow place, and a pipe cutting apparatus using the pipe cutting apparatus. It's about the best way to do it.

[0002]

2. Description of the Related Art For example, when a buried pipe is switched in a city gas pipe, first, as shown in FIG.
After excavating and exposing the pipeline 1 where the switching work is to be performed, the pressure in the pipe at the location to be cut and connected is reduced to a low pressure, and then the front and rear of the pipeline 1 to be cut are temporarily closed using the airbag 2 or the like.

[0005] Next, as shown in FIG. 15, for example, each semi-circular frame 3 is formed of a pair of two, and one end of each is pivotally supported and the other end of the frame 3 is configured to be capable of swinging. After a pipe rotary cutter 5 in which two cutter blades 4 are rotatably arranged so as to be on the same circumference is installed at a cutting position a of the pipeline 1 in a holding manner, The other end of the frame 3 forming a pair while rotating the pipe rotary cutter 5 little by little around the pipeline 1 by sequentially turning the handle 6 on the projection 3 a formed in a projecting shape at a plurality of outer peripheral surfaces. By tightening the cutter blade 4
Is pressed against the tube and cut.

[0004]

However, all of the above-mentioned cutting by the push cutting method using the cutter blade depends on manual work, and there is a problem in workability. Also, when a compressive force is acting on the pipe line when cutting with the cutter blade, the cutter blade bites into the pipe wall thickness and breaks, or the load (load) increases, and it takes a long time. Is needed. In some cases, the broken cutter blade often bites into the tube and does not come off.

Further, since a handle is attached for revolving the pipe rotary cutter, if there is a crossing pipe on the pipe to be cut, the pipe rotary cutter interferes with the crossing of the pipe and the like. Since the cutter could not revolve, the cutting position had to be shifted.

[0006] In addition, in the above-described push-cutting cutting operation using a cutter blade, since the width cut by cutting is very small, even if two pipe lines are cut, the cut pipe is lifted and removed as it is. It was not possible to do so, and it was necessary to forcibly lift and remove it after cutting another extra place.

The present invention has been made in view of the above-mentioned problem, and is a portable type having a small weight, which crosses a pipe to be cut at an arbitrary position (position) in a narrow trench. Provided is a pipe cutting device capable of cutting a pipe in as short a time as possible without displacing a cutting position even when a pipe line or the like is provided, and a cutting method using the pipe cutting device. It is intended to be.

[0008]

In order to achieve the above-mentioned object, a first pipe cutting device according to the present invention is provided with a guide member wound around an outer peripheral surface of a pipe and engaged with the guide member. A rotating member and a rotatable rolling roller are pivotally supported at an appropriate position on the lower surface side, and a rotation mechanism for the rotating member is provided. The rotating member is mounted on the outer peripheral surface of the tube via the rolling roller, and the guide member is rotated by the rotating member. A gantry capable of moving the outer circumference of the tube along with a cutting mechanism having a rotary blade disposed on the gantry and a cutting mechanism for moving the rotary blade of the cutting mechanism toward and away from the tube axis, Instead of the guide member wound around the outer peripheral surface of the tube, there is no guide member arranged in the tube axis direction, and the gantry is mounted on the guide member instead of the rotating member, the rolling roller, and the rotating mechanism. Then, a sliding member that slides on the guide member is provided. In this way, the pipe can be cut easily and in a short time even in a narrow place.

[0009] The second pipe cutting device according to the present invention comprises:
A guide member whose both ends are pivotally supported on both side surfaces of the gantry, and which is integrally wound with the gantry and wound around the outer surface of the tube while holding it in a tension state. A plurality of guide rollers pivotally supported so as to be freely rotatable at appropriate positions on the guide member and on the back side of the gantry, respectively, so as to be able to move in the circumferential direction on the surface, and a rotation arranged on the gantry A cutting mechanism having a blade and a cutting mechanism for moving a rotary blade of the cutting mechanism toward and away from the tube axis, or a guide member wound around the outer peripheral surface of the tube, arranged in the tube axis direction In addition to the guide member, a mounting member of a gantry slidable along the guide member is provided on the guide member. In this way, a small-diameter pipe having an outer diameter of about 150 to 300 mm can be easily and quickly cut even in a narrow place.

In the pipe cutting method according to the present invention, the tip saw is moved while rotating the tip saw of a cutting mechanism employing a tip saw as a rotary blade while supplying a cooling cutting agent to the tip saw. . By doing so, the generation of sparks during cutting can be completely suppressed, and the cutting operation can be performed satisfactorily.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first tube cutting device according to the present invention is a portable tube cutting device, comprising a guide member wound around an outer peripheral surface of a tube, and a rotating member engaged with the guide member. A member and a rotatable rolling roller are pivotally supported at an appropriate position on a lower surface side, and a rotating mechanism for the rotating member is provided. The rotating member is placed on the outer peripheral surface of the tube via the rolling roller, and is rotated by the rotating member to a guide member. And a cutting mechanism having a rotary blade disposed on the mount, and a cutting mechanism for moving the rotary blade of the cutting mechanism toward and away from the pipe axis. It is.

[0012] The second pipe cutting device according to the present invention comprises:
A portable, simple pipe cutting device suitable for cutting small-diameter pipes. Both ends are pivotally supported on both sides of the gantry, and are held together with the gantry while maintaining tension on the outer peripheral surface of the pipe. The guide member wound in a shape, and the guide member and the gantry are rotatable at appropriate positions on the guide member and the back side of the gantry, respectively, so that the guide member and the gantry can move in the circumferential direction on the outer peripheral surface of the tube. And a cutting mechanism having a plurality of guide rollers pivotally supported on the base, a rotary blade disposed on the gantry, and a cutting mechanism for moving the rotary blade of the rotary mechanism toward and away from the tube axis. It is.

In the first pipe cutting apparatus according to the present invention, a guide provided with a cutting mechanism is installed on the outer peripheral surface of the pipe by winding a guide member around the pipe end to be cut. Further, in the second pipe cutting device according to the present invention, a gantry provided with a cutting mechanism by winding a guide member integrated with the gantry around the pipe end to be cut while maintaining the tension state. Is installed on the outer peripheral surface of the pipe.

Next, after the cutting edge is cut into the pipe end, in the first pipe cutting device according to the present invention, the operator operates the rotating mechanism to move the cutting mechanism along the guide member around the pipe end. To move. Further, in the second pipe cutting device according to the present invention, the operator moves around the pipe end while holding the gantry. By the above operation, setting can be easily performed even in a narrow place, and an arbitrary position of the pipe can be cut in as short a time as possible.

Further, in the pipe cutting device according to the present invention,
When equipped with a cooling cutting agent supply device for the rotating blade, when cutting the cutting edge to the pipe end, it is performed while supplying the cooling cutting agent to the rotating blade, thereby reliably preventing the generation of sparks it can.

Further, in the first pipe cutting device according to the present invention, the rotation mechanism may be provided with a reverse rotation preventing mechanism so that the outer circumference of the pipe along the guide member can be moved only in the direction opposite to the rotation direction of the rotary blade. Further, in the second tube cutting device according to the present invention, when a gantry provided integrally with the guide member is provided with a rotation prevention mechanism for preventing the gantry from moving in a direction opposite to the rotation direction of the rotary blade, In the initial stage of cutting or the like, the movement of the cutting mechanism or the gantry in the reverse direction is prevented, the labor of the operator is reduced, and safety at the time of cutting can be secured.

In the first tube cutting device according to the present invention, a guide member arranged in the tube axis direction is used instead of the guide member wound around the outer peripheral surface of the tube. In place of the rolling roller and the rotation mechanism, when a sliding member is provided on the guide member and slides on the guide member,
In the second pipe cutting device according to the present invention, instead of the guide member wound around the outer peripheral surface of the pipe, a guide member arranged in the pipe axis direction is provided, and the guide member is provided on the guide member. When the mounting member of the gantry that can slide along is provided,
After the guide member is fixedly arranged in the pipe axis direction, a gantry provided with a cutting mechanism is installed on the guide member via a sliding member or a mounting member, and thereafter, when a cooling coolant supply device is provided. If the cooling cutting agent supply device is not provided while supplying the cooling cutting agent to the rotating blade, the cutting edge of the rotating blade is cut into the tube as it is, and the cutting mechanism is moved together with the gantry along the guide member. By doing so, the setting can be easily performed even in a narrow place, and the pipe can be cut by a predetermined length in the axial direction as quickly as possible.

Further, in the pipe cutting device according to the present invention,
When equipped with a cooling cutting agent supply device, if an interlock mechanism that does not rotate the rotary blade unless the supply of the cooling cutting agent to the rotary blade is provided, when cutting,
The generation of sparks can be reliably prevented.

Further, in the pipe cutting device according to the present invention,
When a structure in which the tip saw is rotated by an air motor is employed as the cutting mechanism, the pipe is cut off by several millimeters in width at the time of cutting, so that the pipe cut by only two cuts can be easily lifted.

When cutting a pipe using the pipe cutting apparatus according to the present invention, which is provided with a cutting fluid supply device for cooling the rotary blade, the tip saw is rotated while
By moving the tip saw while supplying the coolant for cooling to the tip saw, the generation of sparks can be completely suppressed and the cutting operation can be performed satisfactorily. This is the pipe cutting method according to the present invention.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pipe cutting apparatus according to the present invention will now be described with reference to FIGS.
In addition to the description based on the embodiment shown in FIG. 3, the present invention extends to the method of the present invention for cutting an arbitrary position of a pipe or the pipe in the axial direction using the pipe cutting apparatus. 1 to 5 are views showing a first embodiment of a first pipe cutting device according to the present invention, FIG. 1 is a schematic perspective view,
2 is a partially sectional plan view, FIG. 3 is a partially sectional view of FIG. 2 viewed from the side, FIG. 4 is a view showing a state in which a cutting mechanism is removed from a gantry in FIG. 1, and FIG. FIGS. 6 and 7 are schematic diagrams of a cooling cutting agent supply mechanism to the rotary blade, and FIGS. 6 and 7 show a second embodiment of the first pipe cutting device according to the present invention.
Is a schematic perspective view, FIG. 7 is a view showing a state in which a cutting mechanism is removed from a gantry in FIG. 6, and FIGS. 8 and 9 are views showing a first embodiment of a second pipe cutting apparatus according to the present invention. 8 is a schematic perspective view seen from one side, FIG. 9 is a schematic perspective view seen from the other side, and FIGS. 10 and 11 are views showing a second embodiment of the second pipe cutting device according to the present invention. , FIG. 10 is a schematic perspective view of a main part, FIG. 11 is an overall view showing a state where a cutting mechanism is removed from a gantry in FIG. 10, and FIG. 12 is another embodiment of a cutting mechanism in a second pipe cutting apparatus according to the present invention. An explanatory diagram showing
FIG. 13 is a perspective view of a main part of a fastener constituting the clamp material.
(A) is an explanatory diagram for tightening, and (b) is an explanatory diagram for loosening.

1 to 5, reference numeral 11 denotes a first portable pipe cutting device according to the present invention. For example, a guide member 12 also serving as a clamp, and A pedestal 13 that can move on the outer periphery of the pipe P along the guide member 12
, A cutting mechanism 15 having a rotary blade 14, a cutting mechanism 16 of the cutting mechanism 15, and a cooling coolant supply device 17 to the rotary blade 14.

The guide member 12 serving also as the clamp is constituted by, for example, two roller chains arranged at a predetermined interval, and these two roller chains are determined by the outer peripheral length of the pipe P to be wound. It has a slightly longer length. Since the two roller chains forming the pair need to be wound so as to have substantially the same interval when wound around the pipe P, the two roller chains are connected by, for example, a rod to form two roller chains. The spacing between the chains may be kept constant. On the other hand, if the guide member 12 is formed of, for example, one roller chain, it is not necessary to consider the interval.

In the embodiment shown in FIGS. 1 to 5, the gantry 13 is a sprocket 13a which is a rotating member which engages with the above-mentioned guide member 12, that is, two roller chains.
And a total of four rotatable rolling rollers 13b, each of which is one inside each of the sprockets 13a. With a rotating mechanism 13c and a tension applying mechanism 13d for each sprocket 13a, and mounted on the outer peripheral surface of the pipe P via the rolling rollers 13b,
By rotating each sprocket 13a by the rotation mechanism 13c, the gantry 13 moves on the outer peripheral surface of the pipe P along the two roller chains serving as the guide members 12.

In the embodiment shown in FIGS. 1 to 5,
As a rotating mechanism 13c of each sprocket 13a, a worm 13c is provided by two coaxial handles 13ca.
The worm wheel 13cc, which is coaxial with each sprocket 13a, is rotated through a circle b. In the embodiment shown in FIGS. 1 to 5, as the tension applying mechanism 13d, a pedestal 13db for pivotally supporting the sprocket 13a on one side is formed along the groove 13f provided in the gantry 13 by forward and reverse rotation of the screw shaft 13da. By sliding the sprocket 13a, it is possible to move toward and away from the sprocket 13a on the other side, and to apply a predetermined tension to a roller chain engaged with the sprocket 13a. 13g is a scale for measuring the amount of sliding of the sprocket 13a on one side.

The cutting mechanism 15 is detachably disposed on the gantry 13 by, for example, a bolt.
The rotary blade 14, for example, a tip saw is rotated by an air motor 15a.

The cutting mechanism 16 is provided by moving the rotary blade 14 toward and away from the axis of the tube. In the embodiment shown in FIGS.
By rotating the pinion 16a forward and reverse, the pinion 16d coaxial with the worm wheel 16c is rotated forward and reverse through the worm 16b, and through the ring gear 16e provided on one outer surface of the cutting mechanism 15 to mesh with the pinion 16d. By pivoting the rotary blade 14 in the vertical direction about a pivot pin 16g provided on the other outer surface of the cutting mechanism 15, the rotary blade 14
Are moved toward and away from the tube axis. Reference numeral 16f is a clamp lever that locks the rotary blade 14 from moving toward and away from the tube axis.

Further, as shown in FIG. 5, for example, as shown in FIG.
7a and a storage tank 17b for cutting.
b. A pump 17c and a pipe 17d for supplying the cooling cutting agent 17a in b to the rotary blade 14, and the supply of compressed air to the rotary blade 14 by sensing the supply of the cooling cutting agent 17a to the rotary blade 14. By opening a valve to start the rotation, the rotary blade 14 is provided with an interlock mechanism 17e for preventing the rotary blade 14 from rotating unless the cooling cutting agent 17a is supplied to the rotary blade 14. ing.

In the first pipe cutting device 11 according to the present invention having the above-described configuration, an arbitrary position of the pipe P to be cut is
After winding the guide member (roller chain) 12 also serving as a clamp, the screw shaft 13da is rotated to move the pedestal 13db to one side of the pedestal 13, thereby separating the sprockets 13a engaged with the same roller chain. Then, the gantry 13 to which the cutting mechanism 15 and the cutting mechanism 16 are attached in advance by adjusting the tension of the roller chain is installed on the outer peripheral surface of the pipe P.

Next, the pump 17c is driven to rotate the rotary blade 14
While supplying the cooling coolant 17a to the air motor 1
The handle 16a is turned while the 5a is driven, so that the cutting edge of the rotary blade 14 is cut into the pipe end. 2-3m inside the pipe
m, when the blade edge of the rotary blade 14 has penetrated, the clamp lever 16f is rotated to fix the position of the rotary blade 14 (cutting mechanism 15). Then, in this cut state, the operator turns the handle 13ca to move the cutting mechanism 15 together with the gantry 13 around the pipe end along the guide member 12.
The above operation completes the cutting at an arbitrary position of the pipe P.

When the pipe P to be cut has a small diameter of, for example, about 150 to 300 mm, the first pipe cutting device 11 according to the present invention has a simpler and more compact structure. Needless to say, it is desirable. Therefore, the above-described first pipe cutting device 11 according to the present invention is configured to be simpler and more compact so as to be suitable for cutting a small-diameter pipe P, according to the present invention shown in FIGS. 8 and 9. 2 is a tube cutting device. Hereinafter, the second pipe cutting device according to the present invention will be described.

8 and 9, reference numeral 21 denotes a second pipe cutting device according to the present invention, which is held at least on the outer peripheral surface of the small-diameter pipe P integrally with the gantry 23 while maintaining a tight state. A guide member 22 wound in a holding state;
And a plurality of guide rollers pivotally supported so as to be freely rotatable at an appropriate position on the guide member 22 and an appropriate position on the back side of the gantry 23 so that the gantry 23 and the gantry 23 can move in the circumferential direction on the outer peripheral surface of the pipe P. 22a, 23a and a cutting mechanism 15 having a rotary blade 14 similar to the first pipe cutting device 11 according to the present invention described above.
And a cutting mechanism 24 of the cutting mechanism 15.

In the present embodiment, the guide member 22 has a structure in which, for example, three arc-shaped members 22b are pivotally connected to each other, for example, by a rod 22c at predetermined intervals. . And these arc-shaped members 22b
Among them, the arc-shaped members 22b disposed on both sides are provided at both ends pivotal support portions, and the arc-shaped members 22b disposed at the center are provided at the center portion in addition to the both end pivotal support portions.
Is shown rotatably pivoted.

In the embodiment shown in FIGS. 8 and 9,
Each of the gantry 23 is located at a position near, for example, four corners on the back side thereof.
A total of four rotatable guide rollers 23a are pivotally supported, and the guide members 22 and the guide rollers 22a, 23a
The pedestal 23 moves in the circumferential direction on the outer peripheral surface of the small-diameter tube P in a state of being wound and mounted on the outer peripheral surface of the tube P via the through hole.

In the embodiment shown in FIGS. 8 and 9, one end of the guide member 22 to the gantry 23 is used as a tension applying mechanism 25 for maintaining the tension state and winding in a holding state. A coil spring 25a is arranged in the mounting portion, and the coil spring 25a is tightened by a nut 25b to maintain the gantry 23 in a predetermined tension state with respect to the small-diameter pipe P.

The cutting mechanism 24 is provided by moving the rotary blade 14 toward and away from the axis of the pipe P. In the embodiment shown in FIGS. The vertical swing of the rotary blade 14 with the pivot pin 24b provided on the other outer surface as a fulcrum is engaged with a spherical body fitted to a spherical bush provided on one outer surface of the cutting mechanism 15 so as to be able to swing up and down. By attaching to the tip of the held screw shaft,
The vertical rotation of the rotary blade 14 with the pivot pin 24b provided on the other outer surface of the cutting mechanism 15 as the fulcrum is shown by the reciprocation of the screw shaft by the forward / reverse rotation of the handle 24a. Reference numeral 24c denotes a clamp lever that locks the rotating blade 14 toward and away from the tube axis.

In the embodiment shown in FIGS. 8 and 9,
In addition to the mechanisms 15, 24, and 25 described above, a cooling cutting agent supply device 17 for the rotary blade 14 having the configuration shown in FIG. 5 and similar to the first pipe cutting device 11 according to the present invention is provided. Have.

In the second pipe cutting device 21 according to the present invention having the above-described structure, a guide member 22 integrated with a gantry 23 is wound around an arbitrary position of a small-diameter pipe P to be cut. After turning, the tension of the guide member 22 is adjusted by tightening the nut 25b, and the cutting mechanism 15 and the cutting mechanism 2 are previously adjusted.
The gantry 23 to which 4 is attached is placed on the outer peripheral surface of the pipe P in a tensioned state.

Next, the pump 17c is driven to rotate the rotary blade 14
While supplying the cooling coolant 17a to the air motor 1
By turning the handle 24a while driving the 5a, the cutting edge of the rotary blade 14 is cut into the pipe end. 2-3m inside the pipe
m, when the cutting edge of the rotary blade 14 has penetrated, the clamp lever 24c is rotated to fix the position of the rotary blade 14 (cutting mechanism 15). Then, in the state of being cut in this way, the operator moves around the pipe end by holding the handle 23 b attached to the gantry 23. By the above operation, the pipe P
The cutting at an arbitrary position of is completed.

At the time of cutting the pipe P at an arbitrary position using the above-described pipe cutting devices 11 and 21, when a tip saw having an outer diameter of 135 mm is used as the rotary blade 14, the tip saw is connected to the air motor 15 a. For example, when the chip is rotated 1000 times per minute, the peripheral speed at the radial center position of the chip is about 1000 × 135 × π ≒ 423900 m
Since m / min = 7065 mm / sec = 7.065 m / sec, for example, the tip saw is moved while rotating the tip saw at a speed of 8.0 m / sec or less and supplying the cooling cutting agent 17a to the tip saw. By doing so, the rotary blade 14 can be cut safely without climbing over the pipe, and the generation of sparks at the time of cutting can be completely suppressed.

By the way, the pipe cutting device 11 according to the present invention,
When cutting an arbitrary position of the pipe P as described above using the first pipe cutting device 21, the rotary blade 1
Since the handle 13ca tries to rotate in the direction opposite to the direction in which the gantry 13 is moved by the rotation of 4, the operator always holds the handle 13ca against the force so that the handle 13ca does not rotate in the opposite direction. There is a need.

Therefore, in the first pipe cutting device 11,
The movement of the pipe P along the guide member 12 on the outer peripheral surface is caused by the rotation of the rotary blade 1.
Rotation mechanism 13 so that the rotation is performed only in the direction opposite to the rotation direction
When a reverse rotation preventing mechanism such as a one-way clutch is provided for c, the movement of the cutting mechanism 15 in the reverse direction is prevented,
The labor of the worker is reduced, and safety at the time of cutting can be ensured. In this embodiment, the reverse rotation is prevented by using a worm gear. That is, in the present embodiment, the worm 13cb and the worm wheel 13cc also function as a reverse rotation prevention mechanism.

On the other hand, when an arbitrary position of the small-diameter pipe P is cut using the second pipe cutting device 21, the wall thickness of the small-diameter pipe P is relatively small. Although the reaction force for moving the gantry 23 in the direction opposite to the direction in which the gantry 23 is moved by the rotation of the rotary blade 14 is small,
Again, the operator needs to hold the gantry 23 so as not to move in the opposite direction against this reaction force.

Therefore, in the second pipe cutting device 21, as in the embodiment shown in FIGS. 8 and 9, the screw shaft 26b is attached so as to penetrate from the front side to the rear side of the gantry 23. By installing the rotation preventing mechanism 26 having a simple structure, which fixes the gantry 23 on the outer peripheral surface of the pipe P by screwing the gantry 26b by the rotation of the handle 26a, the gantry 23 is prevented from moving in the reverse direction in the initial stage of cutting. Thus, the labor of the worker is reduced, and safety at the time of cutting can be ensured.

The first pipe cutting device 11 shown in FIGS. 6 and 7
In the first pipe cutting device 11 according to the present invention shown in FIGS. 1 to 5, instead of the guide member 12 also serving as a clamp, for example, a clamp member 31 wound around the outer peripheral surface of the pipe P
And a guide member 32 arranged in the pipe axis direction, for example, as a separate body of two guide rails, and the gantry 13 is replaced with a sprocket 13a, a rolling roller 13b, a rotating mechanism 13c, and a tension applying mechanism 13d. And a sliding member 13e that is placed on the guide member 32 and slides on the guide member 32.

In the first tube cutting device 11 shown in FIGS. 6 and 7, after the guide member 32 is fixedly arranged in the tube axis direction of the tube P by the clamp member 31, the sliding member 13e is mounted on the guide member 32. The gantry 13 to which the cutting mechanism 15 is attached in advance is installed, and then, as described above, the rotary blade 1
The cutting edge of the rotary blade 14 is cut into an arbitrary position of the pipe P while supplying the cooling coolant 17a to
By moving the cutting mechanism 15 together with the guide member 32 along the guide member 32, the pipe P can be cut in the axial direction.

On the other hand, the second pipe cutting device 21 shown in FIG. 10 and FIG.
In the tube cutting device 21, the guide member 22 wound around the outer peripheral surface of the pipe P is replaced with a clamp member 31 wound around the outer peripheral surface of the tube P, for example. A guide member 32 arranged, for example, one guide rail, and a pair of guide rollers 33a arranged on the guide member 32 so as to oppose the guide member 32 so as to be slidable along the guide member 32. , For example, two mounting members 33 are provided in pairs. In addition, the guide member 32 has a predetermined position in the circumferential direction, for example, so that the gantry 23 placed on the pair of placing members 33 can be adjusted so as to be parallel to the tangential direction of the outer periphery of the pipe P, for example. An inclination adjusting mechanism 34 that adjusts the amount of screwing of the two screw shafts 34a screwed with an interval therebetween is provided at both ends thereof.

In the second tube cutting device 21 shown in FIGS. 10 and 11, the guide member 32 in which the inclination of the gantry 23 previously attached to the mounting member 33 is adjusted to the clamp member 31
After fixedly arranged in the pipe axis direction of the pipe P, the mount 23 on which the cutting mechanism 15 is mounted in advance is mounted on the guide member 32 via the mounting member 33, and then, as described above, the rotating blade 14 is cooled. While supplying the cutting agent 17a
Is cut into an arbitrary position of the pipe P, and the operator moves the cutting mechanism 15 together with the gantry 23 along the guide member 32 so that the pipe P can be cut in the axial direction. .

In the pipe cutting devices 11 and 21 according to the present invention shown in FIGS. 6, 7, 10 and 11, the clamp member 31 has a guide member at one end, for example, as shown in FIG. Two belts 31b, 31 provided with hooks 31a that engage with hooks 32a attached to both sides of
As shown in FIG. 13, a ratchet type lashing belt or the like as shown in FIG. 13 in which a tightening fitting 31 d having a ratchet is attached to the other end of one belt 31 b is adopted.

When such a ratchet type lashing belt is employed as the clamp member 31, the hook 31 attached to one end of the two belts 31b and 31c is used.
13a are hooked on the hooks 32a of the guide members 32, respectively, and then, as shown in FIG.
The other end of the other belt 31c to which is not attached is wound around the tightening member 31d of the one belt 31b, and the operating lever 31da of the tightening member 31d is moved forward and backward as indicated by an arrow a in FIG. Tighten by rocking.
The release of the clamp is performed as shown in FIG.
While pulling the release lever 31db of the tightening fitting 31d in the direction of the arrow b, the operating lever 31da is moved 180 degrees in the direction of the arrow c.
Do it by opening it again.

In the first pipe cutting device 11 according to the present invention shown in FIGS. 6 and 7, the cutting mechanism 16 of the rotary blade 14 is provided.
The pivot pin 1 provided on the other outer surface of the cutting mechanism 15
The vertical swing of the rotary blade 14 about 6 g as a fulcrum is shown in FIGS.
Of the second pipe cutting device 21 according to the present invention shown in FIGS. 8 to 11 in place of the one performed through the ring gear 16e provided on one outer surface of the pinion 16d and the cutting mechanism 15 shown in FIG. Like the mechanism 24, a spherical body fitted to a spherical bush provided on one outer surface of the cutting mechanism 15 is attached to the tip of a screw shaft 16h screwed and held so as to be able to swing up and down, so that the screw shaft 16h Cutting mechanism 15 by screw advance / retreat
This shows the rotary blade 14 swinging up and down about a pivot pin 16g provided on the other outer surface of the rotary blade.

In the embodiments of the tube cutting apparatuses 11 and 21 according to the present invention, the rotary blade 14 is rotated by using the air motor 15a as the explosion-proof type. An electric motor may be used, and there is no need to provide the interlock mechanism 17e. Further, in the present embodiment, the structure in which the tension applying mechanisms 13d and 25 are provided has been described. However, if the guide members 12 and 22 can be wound around the outer peripheral surface of the pipe P in a state having a necessary tension, the tension applying mechanism is not necessarily provided. The mechanisms 13d and 25 are not required. Further, as the clamp member 31, for example, a magnetic member may be used. Still further, tension may be applied by screw advance / retreat to fix.

Further, in the embodiment of the first tube cutting device 11, a roller chain or a rail is shown as the guide members 12, 32, but the design can be changed arbitrarily as long as it has the same action. Further, as long as the rotating mechanism 13c, the tension applying mechanism 13d, and the cutting mechanism 16 have the same function, the design can be appropriately changed.

In the second tube cutting device 21, if the cutting mechanism 24 has the same function as that of the cutting device 24, as shown by an imaginary line in FIG. Biased pivot pin 2
After the rotating blade 14 that can freely swing up and down with the fulcrum 4b as a fulcrum is released by rotating the blade fixing lever 24f, the grip 24e is pressed down in the direction of the pipe P against the urging force. Alternatively, as shown by a solid line in FIG. Further, it goes without saying that the design change is arbitrary as long as the tension applying mechanism 25 also has the same action.

[0055]

As described above, according to the present invention,
Even in a narrow place, even if there is a crossing pipeline on the pipeline to be cut, the pipe can be cut easily and in as short a time as possible without shifting the cutting position. In the first aspect of the present invention, when the rotation mechanism is provided with a reverse rotation prevention mechanism so that the movement on the outer peripheral surface of the tube along the guide member is performed only in the direction opposite to the rotation direction of the rotary blade, The movement of the cutting mechanism in the reverse direction is prevented, and safety at the time of cutting can be ensured. Also, the second
In the present invention, when a rotation preventing mechanism for preventing the guide member and the gantry from moving in the direction opposite to the rotation direction of the rotary blade is provided, in the initial stage of cutting, the gantry moves in the opposite direction. Thus, the labor of the worker is reduced, and safety at the time of cutting can be ensured.

In the case where a cooling-cutting agent supply device is provided, an interlock mechanism for preventing rotation of the rotary blade unless a cooling-cutting agent is supplied to the rotary blade is provided. Can reliably prevent the occurrence of sparks during cutting. Furthermore, when a tip saw is used as the rotary blade, the pipe is cut off by several millimeters at the time of cutting, so that the pipe cut by cutting only at two places can be easily lifted.

In addition, according to the present invention, it is possible to cut in the pipe axis direction at the time of branching out the insertion pipe (double pipe). This eliminates the need for troublesome work such as cutting by hitting the edge cutting portion with a chisel or the like.

When cutting a pipe using the pipe cutting apparatus according to the present invention, the tip saw is rotated while rotating.
By moving the tip saw while supplying the coolant for cooling to the tip saw, the generation of sparks can be completely suppressed and the cutting operation can be performed satisfactorily.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a first embodiment of a first pipe cutting device according to the present invention.

FIG. 2 is a partially sectional plan view showing a first embodiment of the first pipe cutting apparatus according to the present invention.

FIG. 3 is a partial cross-sectional view of FIG. 2 viewed from the side.

FIG. 4 is a view showing a state in which a cutting mechanism is removed from a gantry in FIG. 1;

FIG. 5 is a schematic configuration diagram of a cooling cutting agent supply mechanism to a rotary blade.

FIG. 6 is a schematic perspective view showing a second embodiment of the first pipe cutting apparatus according to the present invention.

FIG. 7 is a view showing a state in which a cutting mechanism is removed from a gantry in FIG. 6;

FIG. 8 is a schematic perspective view showing the first embodiment of the second pipe cutting device according to the present invention, viewed from one side.

FIG. 9 is a schematic perspective view of FIG. 8 as viewed from the other side.

FIG. 10 is a schematic perspective view showing a main part of a second embodiment of the second tube cutting apparatus according to the present invention.

FIG. 11 is an overall view showing a state where a cutting mechanism is removed from a gantry in FIG. 10;

FIG. 12 is an explanatory view showing another embodiment of the cutting mechanism in the second pipe cutting device according to the present invention.

FIG. 13 is a perspective view of a main part of a fastener constituting a clamp member of a pipe cutting device according to a second embodiment of the present invention, wherein (a) is an explanatory diagram for tightening, and (b) is an explanatory diagram for loosening. It is.

FIG. 14 is a schematic explanatory view of a related art when a buried pipe is switched.

FIG. 15 is a schematic explanatory view of a conventional pipe rotary cutter used for pipe cutting.

[Explanation of symbols]

 P pipe 11 first pipe cutting device 12 guide member 13 gantry 13a sprocket 13b rolling roller 13c rotating mechanism 13d tension applying mechanism 13e sliding member 14 rotating blade 15 cutting mechanism 15a air motor 16 cutting mechanism 17 cooling coolant supply device 17e Interlock mechanism 21 Second pipe cutting device 22 Guide member 22a Guide roller 23 Mount 23a Guide roller 24 Cutting mechanism 25 Tension applying mechanism 26 Rotation prevention mechanism 31 Clamp member 32 Guide member 33 Mounting member

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Nori Morita 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Inside Osaka Gas Co., Ltd. (72) Inventor Kenji Iizuka Hirano-cho, Chuo-ku, Osaka-shi, Osaka 1-2, Osaka Gas Co., Ltd. (72) Katsutoshi Nishiura, Inventor Katsutoshi Nishiura 4-1-2, Hiranocho, Chuo-ku, Osaka City, Osaka Prefecture (72) Inventor Yoshimasa Hashimoto, Chuo-ku, Osaka City, Osaka Prefecture 4-1-2, Hirano-cho Osaka Gas Co., Ltd.

Claims (10)

[Claims] 1. A portable pipe cutting device, comprising: a guide member wound around an outer peripheral surface of a pipe; a rotating member and a rotatable rolling roller engaged with the guide member; A gantry that supports and has a rotation mechanism for the rotating member, is mounted on the outer peripheral surface of the tube via the rolling roller, and is movable on the outer peripheral surface of the tube along the guide member by rotation of the rotating member; A pipe cutting device comprising: a cutting mechanism having a rotary blade disposed on a gantry; and a cutting mechanism for moving the rotary blade of the cutting mechanism toward and away from a pipe axis. 2. A portable simple pipe cutting device suitable for cutting small-diameter pipes, wherein both ends are pivotally supported on both side surfaces of a gantry, respectively, and a tension state is formed on the outer peripheral surface of the pipe integrally with the gantry. A guide member that is held and wound in a holding shape, and a guide member and a base that are movable in the circumferential direction on the outer peripheral surface of the pipe so that the guide member and the base can move in the circumferential direction, respectively. A cutting mechanism having a plurality of guide rollers pivotally supported so as to be freely rotatable, a rotary blade disposed on the gantry, and a cutting mechanism for moving the rotary blade of the cutting mechanism toward and away from the tube axis. A pipe cutting device, comprising: 3. The pipe cutting device according to claim 1, further comprising a cooling cutting agent supply device for supplying the cooling blade to the rotary blade. 4. The tube according to claim 1, wherein the rotation mechanism is provided with a reverse rotation preventing mechanism such that movement of the outer periphery of the tube along the guide member can be performed only in a direction opposite to the rotation direction of the rotary blade. Cutting device. 5. The gantry is provided with a rotation preventing mechanism for preventing the gantry attached integrally with the guide member from moving in the direction opposite to the rotation direction of the rotary blade at an initial stage of cutting. 3. The pipe cutting device according to 3. 6. A guide member arranged in the pipe axis direction instead of a guide member wound around the outer peripheral surface of a pipe.
4. The pipe cutting device according to claim 1, further comprising a sliding member mounted on the guide member and sliding on the guide member, instead of the rotating member, the rolling roller, and the rotating mechanism. 7. A guide member arranged in the axial direction of the tube instead of the guide member wound around the outer peripheral surface of the tube, and a gantry on the guide member slidable along the guide member. The pipe cutting device according to claim 2, wherein the mounting member is provided. 8. The pipe cutting apparatus according to claim 3, further comprising an interlock mechanism that does not rotate the rotary blade unless a cooling coolant is supplied to the rotary blade. . 9. The cutting mechanism has a structure in which a tip saw is rotated by an air motor.
9. The pipe cutting device according to any one of items 1 to 8. 10. When cutting a pipe using a pipe cutting apparatus according to claim 9, which is provided with a cooling-cutting agent supply device for a rotary blade, cooling the tip saw while rotating the tip saw. A pipe cutting method characterized by moving a tip saw while supplying an agent.