JP2020168690A - Interior type pipe cutting device - Google Patents

Abstract

To provide an interior type pipe cutting device which can achieve cost reduction and operation time reduction compared to a conventional one, and can also improve durability of a cutting tool such as byte or the like.SOLUTION: An interior type pipe cutting device 1, which is carried in a pipe 2 and cuts the pipe 2 from inside, comprises: a stationery unit 3 which takes a reaction force on an inner peripheral surface of the pipe 2, and thus, can position a central axis of itself concentrically with an axis of the pipe 2; and a turning unit 4 which is connected to the stationery unit 3 in series so as to be capable of turning with the central axis of the stationery unit 3 as a pivot. Clamp members 9, which moves back and forth evenly in conjunction with each other in three or more radial directions from the central axis of the stationery unit 3, are provided on the stationery unit 3 at equal intervals. A delivery mechanism 35, which continuously delivers a byte 21 (cutting tool) for cutting the inner peripheral surface of the pipe 2 in conjunction with turning of the turning unit 4, is provided on the turning unit 4.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pipe-internal pipe cutting device for carrying into a pipe and cutting the pipe from the inside.

Conventionally, when cutting a pipe (pipeline) laid on the seabed or a pipe buried in the ground for removal work, etc., an external pipe cutting device is attached to the outer circumference of the pipe and a bite (cutting) is performed. The tool) is swiveled around the pipe, and each time the cutting tool swirls around the pipe, the cutting tool is intermittently sent inward in the radial direction of the pipe via a ratchet mechanism, and the step is performed while the cutting tool repeatedly swirls. The outer circumference of the pipe is cut deeply to finally reach the cutting.

The following patent document 1 and the like are available as prior art document information related to this type of exterior pipe cutting device.

JP-A-2017-185621 Japanese Unexamined Patent Publication No. 2010-179384

However, in such a conventional pipe cutting device, it is necessary to mount an external pipe cutting device around the cutting portion of the pipe to secure a working space for turning the bite, and the cutting portion of the pipe Since it was necessary to dig into the surrounding area and remove a large amount of earth and sand, there was a problem that the cost would rise significantly and the working time would increase.

Further, every time the cutting tool makes a round turn around the pipe, a pushing amount corresponding to the cutting amount for the one turn is given to the cutting tool at a time, so that at the start of cutting immediately after the cutting tool is fed out. A large impact may be applied to the cutting tool, which may adversely affect the durability of the cutting tool.

The present invention has been made in view of the above circumstances, and it is possible to reduce the cost and the working time as compared with the conventional case, and it is possible to improve the durability of cutting tools such as cutting tools. The purpose is to provide the device.

The present invention is an internal pipe cutting device that carries into the inside of a pipe and cuts the pipe from the inside, and by applying a reaction force to the inner peripheral surface of the pipe, its own central axis is set to the axis of the pipe. It consists of a fixed unit that can be positioned concentrically with the fixed unit and a swivel unit that is connected in series to the fixed unit so that it can swivel around the central axis of the fixed unit as a swivel axis. Clamp members that move in and out evenly in three or more directions from the axis to the radial direction are provided at equal intervals, and the swivel unit is equipped with a cutting tool for cutting the inner peripheral surface of the pipe. It is characterized by having a delivery mechanism that continuously sends out in conjunction with turning.

Therefore, when cutting the pipe, the internal pipe cutting device is carried into the cutting position inside the pipe, and the clamp members are interlocked with each other to be evenly projected. The clamp member is in pressure contact with the inner peripheral surface of the pipe, and the central axis of the fixed unit is positioned concentrically with the axial center of the pipe. Therefore, when the swivel unit is swiveled in such a state, the swivel unit also becomes said. The pipe will rotate concentrically with the axis of the pipe, and the cutting tool will be continuously sent out in conjunction with the rotation of the rotation unit to gradually and deeply cut the inner peripheral surface of the pipe, and the cutting tool will rotate. The pipe is finally cut while repeating the above.

Further, in the present invention, the feeding mechanism engages and holds the holder holding the cutting tool and the holder so as to be able to move in the radial direction of the turning trajectory of the cutting tool, and is equipped with a guide member in the turning unit. The tip is screwed into a portion of the holder that does not interfere with the cutting tool, extends parallel to the movement direction of the holder, and is pivotally supported by the swivel unit so that the base end can rotate about the axis. It is preferable to include a screw rod and a gear train that obtains torque from the turning operation of the turning unit and transmits it to the screw rod as a rotational force.

In this way, the torque obtained from the turning operation of the turning unit is transmitted to the screw rod as a rotational force via the gear train, and the holder is guided to the guide member by rotating the screw rod around the axis. It moves and the cutting tool is continuously delivered in conjunction with the rotation of the swivel unit, and moreover, the cutting tool can be easily fed by the reverse operation of the feeding mechanism simply by swiveling the swivel unit in the opposite direction. It becomes possible to pull in.

Further, in the present invention, the fixed unit and the swivel unit are all provided with guide arms projecting from their respective central axes and swivel axes in three or more directions in the radial direction and equipped with traveling wheels at their tip portions at equal intervals. It is preferable that the traveling wheels of all the guide arms are floated and supported from the inner peripheral surface of the pipe in a state where the clamp member is projected and pressed against the inner peripheral surface of the pipe.

In this way, when the internal pipe cutting device is carried to the cutting position inside the pipe, the fixing unit and the swivel unit are supported by a part of the downward guide arms, and the remaining guide arms prevent the pipe from tipping over. The rolling of each traveling wheel makes it possible to smoothly carry the fixed unit and the swivel unit to the cutting position, and at the cutting position, all the clamp members are projected and pressed against the inner peripheral surface of the pipe. As a result, the traveling wheels of all the guide arms can be floated and supported from the inner peripheral surface of the pipe, and the swivel unit can be swiveled without any trouble.

According to the internal pipe cutting device of the present invention described above, various excellent effects can be obtained as described below.

(I) According to the invention according to claim 1 of the present invention, since the internal pipe cutting device for cutting the pipe from the inside is used, it is not necessary to secure a working space around the cutting portion of the pipe. It is possible to avoid the work of digging around the cut part of the pipe and removing a large amount of earth and sand, and it is possible to reduce the cost and work time compared to the conventional method, and the cutting tool can be swiveled by the swivel unit. Since it can be continuously sent out in conjunction with the above, it is possible to prevent a large impact as in the conventional case from being applied to the cutting tool, and the durability of the cutting tool can be remarkably improved.

(II) According to the invention according to claim 2 of the present invention, a continuous feeding mechanism of a cutting tool interlocked with the swivel of the swivel unit can be realized with a simple structure, and the swivel unit can be rotated in the opposite direction. The cutting tool can be pulled in by simply turning the cutting tool to the inside, so that the cutting tool can be easily separated from the inner peripheral surface of the pipe to carry out the internal pipe cutting device when the cutting work of the pipe is interrupted. It can be returned to the possible state.

(III) According to the third aspect of the present invention, the fixed unit and the swivel unit can be smoothly supported by a part of the guide arms and the remaining guide arms can prevent the fixed unit and the swivel unit from tipping over. It can be carried to the cutting position inside the pipe, and after positioning by overhanging the clamp member, the traveling wheels of all the guide arms are lifted and supported from the inner peripheral surface of the pipe to rotate the swivel unit without any trouble. Can be done.

It is sectional drawing which shows an example of embodiment of this invention. FIG. 1 is an arrow view in the II-II direction of FIG. It is a view of the arrow in the direction of III-III of FIG. It is sectional drawing explaining the operation state of the clamp member of FIG. It is a perspective view which shows the detail of the gear train of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 5 show an example of an embodiment of the present invention, and FIG. 1 shows an internal pipe cutting device that carries the pipe 2 inside and cuts the pipe 2 from the inside. A fixed unit 3 capable of positioning its own central axis concentrically with the axial center of the pipe 2 by applying a reaction force to the inner peripheral surface of the pipe 2, and a fixed unit 3 capable of turning around the central axis of the fixed unit 3 as a swivel axis. It is composed of a swivel unit 4 connected in series with the fixed unit 3.

Here, as shown in FIGS. 1 and 2, the fixing unit 3 is divided into a front frame 5 and a rear frame 6, and the front frame 5 is attached to the body of the rear frame 6. The body is slidably fitted in a telescopic manner, and the body of the front frame 5 is moved in the front-rear direction (the axial direction of the pipe 2) by a hydraulic cylinder 7 mounted on the rear surface of the body of the rear frame 6. It is designed so that it can move forward and backward.

Further, on the body of the rear frame 6, a pair of guide plates 8 (see FIG. 3) are erected at four locations arranged at equal intervals in the circumferential direction, and each guide plate 8 at these four locations is erected. While the clamp members 9 are slidably sandwiched between the mutual gaps, the clamp members 9 are connected to the outer peripheral portion of the rear surface of the disk-shaped base plate 10 mounted at the front position of the front frame 5 via the guide block 11. ing.

At this time, the clamp member 9 and the guide block 11 are connected by engaging the elongated hole 12 on the clamp member 9 side and the guide pin 13 on the guide block 11 side, and the fixing unit 3 The clamp member 9 is allowed to be displaced in four directions in the radial direction from the central axis of the clamp member 9.

Moreover, a slit 14 is formed in a portion of the clamp member 9 that overlaps with each of the guide plates 8 so as to gradually separate from the central axis toward the rear of the fixing unit 3, and penetrates the slit 14. Then, the clamp member 9 and each of the guide plates 8 are fastened by the guide pin 15, and the body portion of the front frame 5 is made to appear and disappear with respect to the body portion of the rear frame 6 by the hydraulic cylinder 7. By changing the relative position of the guide pin 15 in the slit 14, all the clamp members 9 are interlocked with each other and move back and forth evenly in the radial direction.

That is, as shown in the lower half of FIG. 4, the body of the front frame 5 is pulled into the body of the rear frame 6 by the hydraulic cylinder 7, and the guide pin 15 is relative to the front of the slit 14 of the clamp member 9. All the clamp members 9 are interlocked with each other and evenly advance in the radial direction, and as shown in the upper half of FIG. 4, the body of the front frame 5 is moved by the hydraulic cylinder 7 to the rear frame 6. By pushing out from the body of the clamp member 9 and relatively moving the guide pin 15 behind the slit 14 of the clamp member 9, all the clamp members 9 are interlocked with each other and evenly retract in the anti-radiation direction. There is.

Further, the swivel unit 4 connected in series with the fixed unit 3 includes an octagonal swivel plate 16 as a main structure as shown in FIG. 2, and is between the swivel plate 16 and the base plate 10 of the front frame 5. Are rotatably connected via a swivel ring 17 arranged concentrically with the central axis of the fixed unit 3.

The swivel ring 17 has a structure in which a rolling element 17c is rotatably held between the inner race 17a and the outer race 17b, and the inner race 17a and the outer race 17b are relative to each other with low friction. The inner race 17a is fixed to the outer periphery of the rear surface of the swivel plate 16 and the outer race 17b is fixed to the outer periphery of the front surface of the base plate 10 so as to be rotatable.

Further, gear teeth 17d are formed on the inner peripheral surface of the inner race 17a over the entire circumference, and a hydraulic motor equipped with a pinion 18a that meshes with the gear teeth 17d on the base plate 10 side. It is designed to be driven by 18.

Here, the fixed unit 3 and the swivel unit 4 project from the central axis and the swivel axis in three or more directions (four directions in the drawing) in the radial direction, and the guide arm 20 is equipped with a traveling wheel 19 at the tip thereof. Are provided at equal intervals, and the traveling wheels 19 of all the guide arms 20 float and support from the inner peripheral surface of the pipe 2 in a state where all the clamp members 9 are projected and pressed against the inner peripheral surface of the pipe 2. It is supposed to be done.

More specifically, as shown in FIGS. 2 and 3, four lines are formed on the front outer circumference of the swivel plate 16 in the swivel unit 4 and the rear end outer circumference of the rear frame 6 in the fixed unit 3. The guide arms 20 are arranged in a cross shape so as to reach an outer diameter range smaller than the inner diameter of the pipe 2 by a small clearance, and the fixing unit 3 and the fixed unit 3 and a part of the guide arms 20 downward are arranged. The inside of the pipe 2 can be conveyed while supporting the swivel unit 4 and preventing the pipe from tipping over by the remaining guide arm 20.

Further, the swivel unit 4 is provided with a delivery mechanism 35 that continuously feeds a bite 21 (cutting tool) for cutting the inner peripheral surface of the pipe 2 in conjunction with the swivel of the swivel unit 4. The delivery mechanism 35 is mounted on the front surface of the swivel plate 16 of the swivel unit 4 by engaging and holding the holder 22 holding the bite 21 and the holder 22 so as to be able to move in the radial direction of the swivel trajectory of the bite 21. The guide member 23 and the tip portion of the holder 22 are screwed into an L-shaped portion (a portion that does not interfere with the bite 21) at the end near the center of rotation via the female screw member 24 to move the holder 22. Torque is applied from the screw rod 25 pivotally supported at the center of the front surface of the swivel plate 16 of the swivel unit 4 and the swivel operation of the swivel unit 4 so as to extend parallel to the direction and rotate the base end portion about the axis. It is provided with a gear train 26 which is obtained and transmitted as a rotational force to the screw rod 25.

Here, as shown in FIGS. 1, 4, and 5, the gear train 26 turns with respect to the non-rotatable pinion 27 fixed to the center of the front end of the body of the front frame 5 in the fixed unit 3. A gear 28 pivotally supported on the rear surface of the swivel plate 16 of the unit 4 is meshed, and the swivel unit 4 is swiveled by the hydraulic motor 18 to rotationally drive the gear 28 meshed with the pinion 27. The generated torque is converted in the perpendicular direction via the bevel gear box 29 and transmitted to the screw rod 25.

A gear 31 that meshes with a pinion 30 coaxial with the gear 28 is fitted onto the input shaft 29a of the bevel gear box 29, and the screw rod 25 is coupled to the output shaft 29b of the bevel gear box 29. It is connected via 32, and inside the bevel gear box 29, the torque transmission direction is changed in the perpendicular direction by meshing the bevel gear 33 of the input shaft 29a and the bevel gear 34 of the output shaft 29b. It has become.

When cutting the pipe 2 using such an internal pipe cutting device 1, it is necessary to carry the internal pipe cutting device 1 to the cutting position inside the pipe 2, but a part of the internal pipe cutting device 1 goes downward. While the guide arm 20 supports the fixed unit 3 and the swivel unit 4 and the remaining guide arm 20 prevents the vehicle from tipping over, the fixed unit 3 and the swivel unit 4 are smoothly carried into the cutting position by the rolling of each traveling wheel 19. Is possible.

Then, when the body portion of the front frame 5 is pulled into the body portion of the rear frame 6 by the hydraulic cylinder 7 at the cutting position inside the pipe 2, the guide pin 15 is relatively in front of the slit 14 of the clamp member 9. All the clamp members 9 are brought together, and all the clamp members 9 are interlocked with each other and evenly advance in the radial direction to project, the clamp members 9 are pressed against the inner peripheral surface of the pipe 2, and the central axis of the fixed unit 3 is the pipe. As a result of being positioned concentrically with the axis of 2 and the traveling wheels 19 of all the guide arms 20 being floated and supported from the inner peripheral surface of the pipe 2, the swivel unit 4 is swiveled without any trouble. It becomes possible to make it.

In such a state, when the pinion 18a is rotationally driven by the hydraulic motor 18 to rotate the swivel unit 4 via the gear teeth 17d, the swivel unit 4 is swiveled concentrically with the axial center of the pipe 2, while the front portion. The gear 28 meshed with the pinion 27 at the front end of the body of the frame 5 is rotationally driven, and the torque obtained thereby is converted in the perpendicular direction via the bevel gear box 29 and transmitted to the screw rod 25, and the screw rod 25 is transferred to the screw rod 25. By rotating around the axis, the holder 22 moves while being guided by the guide member 23, the bite 21 is continuously sent out in conjunction with the swivel of the swivel unit 4, and the bite 21 is the inner circumference of the pipe 2. The surface is gradually deeply cut, and the pipe 2 is finally cut as the turning is repeated.

If some trouble occurs in the cutting process of the pipe 2 and the cutting operation is interrupted, the pinion 18a may be reversely driven by the hydraulic motor 18 to rotate the swivel unit 4 in the reverse direction via the gear teeth 17d. Well, if you do so, the bite 21 will be pulled in in conjunction with the reverse turning of the swivel unit 4, and the bite 21 will be separated from the inner peripheral surface of the pipe 2 to cause the internal pipe cutting device 1. It is possible to return to a state where it can be carried out.

Therefore, according to the above embodiment, since the internal pipe cutting device 1 is used to cut the pipe 2 from the inside, it is not necessary to secure a working space around the cutting portion of the pipe 2, and the cutting portion of the pipe 2 is cut. It is possible to avoid the work of digging around the pipe and removing a large amount of earth and sand, reducing the cost and working time compared to the conventional method, and the bite 21 is linked with the turning of the turning unit 4. Since it can be continuously sent out, it is possible to prevent a large impact as in the conventional case from being applied to the bite 21, and the durability of the bite 21 can be remarkably improved.

Further, particularly in the case of this embodiment, the continuous feeding mechanism 35 of the bite 21 interlocked with the turning of the turning unit 4 can be realized with a simple structure, and the turning unit 4 is swiveled in the opposite direction. The bite 21 can be pulled in by itself, whereby the bite 21 can be easily separated from the inner peripheral surface of the pipe 2 when the cutting work of the pipe 2 is interrupted, and the internal pipe cutting device 1 is carried out. It can be returned to the possible state.

Further, the fixed unit 3 and the swivel unit 4 are supported by a part of the guide arms 20 and the fixed unit 3 and the swivel unit 4 are smoothly carried into the cutting position inside the pipe 2 while the remaining guide arms 20 prevent the fixed unit 3 and the swivel unit 4 from tipping over. Moreover, after positioning by overhanging the clamp member 9, all the traveling wheels 19 of the guide arms 20 can be lifted and supported from the inner peripheral surface of the pipe 2 to rotate the swivel unit 4 without any trouble.

The internal pipe cutting device of the present invention is not limited to the above-described embodiment, and a plurality of swivel units may be connected to one fixed unit, and the cutting tool is a cutting tool. Of course, other than that, a rotary cutter or the like can be appropriately selected, and various changes can be made without departing from the gist of the present invention.

1 Internal pipe cutting device 2 Pipe 3 Fixed unit 4 Swivel unit 5 Front frame 6 Rear frame 9 Clamp member 19 Running wheel 20 Guide arm 21 bite (cutting tool)
22 Holder 23 Guide member 25 Screw rod 26 Gear train 35 Feeding mechanism

Claims (3)

An internal pipe cutting device that carries in the inside of a pipe and cuts the pipe from the inside, and by applying a reaction force to the inner peripheral surface of the pipe, its own central axis becomes concentric with the axis of the pipe. It consists of a fixed unit that can be positioned and a swivel unit that is connected in series to the fixed unit so that it can swivel around the central axis of the fixed unit as a swivel axis. Clamp members that move in and out evenly in three directions or more are provided at equal intervals, and a cutting tool for cutting the inner peripheral surface of the pipe is interlocked with the turning of the turning unit. An internal pipe cutting device characterized by having a delivery mechanism that continuously sends out. The feeding mechanism engages and holds the holder that holds the cutting tool, the holder so that it can move in the radial direction of the turning trajectory of the cutting tool, and the guide member mounted on the turning unit, and the cutting of the holder. A screw rod axially supported by the swivel unit so that the tip portion is screwed into a portion that does not interfere with the tool, extends parallel to the moving direction of the holder, and the base end portion can rotate about the axis, and the above. The internal pipe cutting device according to claim 1, further comprising a gear train that obtains torque from the turning operation of the turning unit and transmits it to the screw rod as a rotational force. The fixed unit and the swivel unit are provided with guide arms that project from the central axis and the swivel axis in three or more directions in the radial direction at equal intervals and are equipped with traveling wheels at the tip thereof, and all the clamp members are projected to be pipes. The interior according to claim 1 or 2, wherein the traveling wheels of all the guide arms are floated and supported from the inner peripheral surface of the pipe in a state of being pressure-contacted with the inner peripheral surface of the pipe. Type pipe cutting device.

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