Cut forming device

Abstract

To provide a cut forming device capable of performing the cutting work of a coating film in a safe and good workability manner and forming a cut in both of an inner coating film and an outer coating film and in both of the axial direction and the circumferential direction of a pipe.SOLUTION: The cut forming device comprises: a cutting blade part 16 for forming one or more cuts in a coating film of a lining pipe; a truck part 12 having wheels on front, rear, right and left sides and capable of traveling in a longitudinal direction; and a cutting blade support part 17 for supporting the cutting blade part above the truck part in a support height changeable manner and energizing the cutting blade part upward. As the cutting blade part, it is preferable to comprise two disk-shaped rotary blades 16a and 16b which are rotatably supported by the cutting blade support part and disposed at a certain interval in a lateral direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a notch forming device, and particularly to a device for making notches in an old coating when regenerating a tubular member provided with a coating such as a lining steel pipe to facilitate peeling.

Background Art

[0002] Lining pipes in which a coating is formed by fixing a polyolefin such as polyethylene or polypropylene, a resin material such as vinyl chloride, or a rubber material to the surface (inner surface or outer surface) of a metal pipe such as a steel pipe are used in various industrial fields.

[0003] For example, a polyethylene powder lining steel pipe (PEL) in which a polyethylene powder is heat-sealed to the surface of a steel pipe to form a coating has excellent characteristics such as chemical and physical stability of the coating and ease of processing, and is therefore used as a corrosion-resistant steel pipe for piping for transporting various fluids.

[0004] In recent years, from the viewpoints of resource recycling and reduction of environmental load, reuse of lining pipes has been attempted. In reuse, the lining pipe is regenerated by peeling off an old coating deteriorated by years of use and forming a new coating again.

[0005] In addition, the following Patent Document 1 is a document disclosing a technique for peeling a coating from a lining pipe.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] By the way, when peeling the old coating from the lining pipe, conventionally, an operation of cutting into the coating with a cutter knife so as to divide the coating has been performed. This is to make it easier to peel the coating.

[0008] On the other hand, such a cutting operation has room for improvement in terms of safety and workability. The operation of using a cutter knife involves the risk of injury and requires a great deal of labor. Also, depending on the diameter and length of the pipe, it may not be possible to reach and make a cut.

[0009] On the other hand, Patent Document 1 discloses an instrument for cutting into a coating (referred to as an "inner coating" in the present application) formed on the inner surface of a pipe (see FIG. 6 of the drawings of the same document and paragraphs

[0062] to

[0067] of the specification). However, since the instrument is only supported in the pipe by two upper and lower blades, it is not always easy to stably run the instrument in the pipe axis direction and perform the cutting operation with good workability.

[0010] Also, with this instrument, it is not possible to cut into the coating (referred to as an "outer coating" in the present application) formed on the outer surface of the pipe. Although Patent Document 1 shows another instrument for cutting into the outer coating (see FIG. 8 of the drawings of the same document and paragraph

[0068] of the specification), there is the trouble of having to prepare and use separate instruments for the inner coating and the outer coating. Furthermore, neither the instrument shown in FIG. 6 of Patent Document 1 nor the instrument shown in FIG. 8 of the same document can make a cut in the circumferential direction of the pipe.

[0011] Therefore, an object of the present invention is to provide a cut forming device that enables the cutting operation of the coating to be performed safely and with good workability, and that can form cuts in both the inner coating and the outer coating, and also in either the axial direction or the circumferential direction of the pipe.

Means for Solving the Problems

[0012] In order to solve the above problems and achieve the object, the notch forming device according to the present invention includes a notch blade for forming a notch in the coating of the lining pipe, a carriage part having wheels on the front, rear, left, and right and capable of traveling in the front-rear direction, and a notch blade support part that supports the notch blade at an upper position of the carriage part so that the support height can be changed and biases the notch blade upward. In the present application, the above notch forming device may be referred to as a "notch device" or simply a "device", the lining pipe may be referred to as a "pipe", and the above notch blade and a rotating blade described later may be referred to as a "blade", respectively.

[0013] The notch forming device of the present invention can form a notch in both the circumferential direction and the pipe axis direction (the axial direction of the lining pipe) with respect to both the coating (inner coating) formed on the inner surface of the lining pipe and the coating (outer coating) formed on the outer surface.

[0014] Hereinafter, (a) forming a notch in the pipe axis direction with respect to the inner coating is referred to as the "first usage mode", (b) forming a notch in the circumferential direction with respect to the inner coating is referred to as the "second usage mode", (c) forming a notch in the pipe axis direction with respect to the outer coating is referred to as the "third usage mode", and (d) forming a notch in the circumferential axis direction with respect to the outer coating is referred to as the "fourth usage mode", and each usage method of the present device will be described.

[0015] (a) First usage mode To form a notch in the pipe axis direction with respect to the inner coating, the present device is arranged in the pipe so that the front-rear direction of the present device coincides with the pipe axis direction (see FIGS. 3 and 4 described later). At this time, after operating the notch blade support part to lower the notch blade, the present device is placed in the pipe, and then the notch blade support part is operated to raise the notch blade and press the notch blade against the coating formed on the inner surface of the pipe (the notch blade is pressed against the coating by being biased upward by the notch blade support part). And in this state, the present device (carriage part) is made to travel in the pipe axis direction (front-rear direction). Thereby, the inner coating is cut by the notch blade pressed against the inner coating, and a notch in the pipe axis direction can be formed with respect to the inner coating.

[0016] (b) Second usage mode To form a circumferential cut with respect to the inner membrane, the device is placed inside the pipe so that the left - right direction of the device coincides with the pipe axis direction (see FIGS. 5 and 6 described later). At this time, the cutting blade support part is operated to lower the cutting blade in the same manner as in the first usage mode. After installing the device inside the pipe, the cutting blade is raised to press the cutting blade against the inner membrane. And in this state, for example, by rotating the lining pipe around the pipe axis (centering on the pipe axis), the device (the carriage part) can be relatively run in the circumferential direction of the pipe (with respect to the lining pipe), and a circumferential cut can be formed with respect to the inner membrane.

[0017] Here, in the present invention (regarding the carriage part), "running" means that the carriage part (therefore, the cutting formation device and the cutting blade also) moves relatively with respect to the lining pipe (membrane). That is, "running" in the present invention does not only mean that the carriage part itself moves, but also includes the case where the lining pipe moves or rotates while the carriage part (the cutting device and the cutting blade) itself does not move, so that the membrane moves with respect to the carriage part, or the case where both the carriage part (the cutting device and the cutting blade) and the lining pipe (membrane) move or rotate, so that the carriage part (the cutting device and the cutting blade) moves relatively with respect to the lining pipe (membrane) (for example, the carriage part and the lining pipe move or rotate in opposite directions). Because as long as the cutting blade and the membrane move relatively, in any case, the cutting blade pressed against the pipe wall can cut the membrane to form a cut.

[0018] Therefore, in the second usage mode described above, typically the lining pipe is rotated, but the cutting device may be rotated without rotating the lining pipe, or the lining pipe and the cutting device may be rotated in opposite directions to each other. The same applies to the first usage mode. The cutting device may be relatively moved with respect to the lining pipe by moving the lining pipe in the pipe axis direction without moving the cutting device, or the cutting device and the lining pipe may be moved in opposite directions to each other. The same also applies to the third usage mode described next and the fourth usage mode described later.

[0019] (c) Third usage mode In order to form a cut in the axial direction with respect to the outer sheath, for example, place the cutting device on the floor, align the front-rear direction of the cutting device with the axial direction of the tube, and arrange the lining tube so as to be placed on the cutting blade (see FIGS. 7 and 8 described later). At this time, part or all of the self-weight of the lining tube may be applied to the cutting device (cutting blade) (the same applies to the fourth usage mode described below). This is to enable the cutting blade to bite into the outer sheath to more reliably form a cut. Then, in this state, if the cutting device (carriage part) is run in the axial direction (front-rear direction) of the tube, a cut in the axial direction can be formed in the outer sheath by the cutting blade pressed against the outer sheath.

[0020] (d) Fourth usage mode In order to form a cut in the circumferential direction with respect to the outer sheath, for example, place the cutting device on the floor, align the left-right direction of the cutting device with the axial direction of the tube, and arrange the lining tube so as to be placed on the cutting blade (see FIGS. 9 and 10 described later). Then, in this state, if the lining tube is rotated around the axis of the tube, a cut in the circumferential direction can be formed in the outer sheath by the cutting blade pressed against the outer sheath.

[0021] In the cutting device of the present invention, as a more specific structure, one or any plurality of the following structures (1) to (5) can be preferably adopted.

[0022] (1) The cutting blade is a disk-shaped rotating blade rotatably supported by a cutting blade support portion. According to the rotating blade, the device can run more smoothly and cut the film. Also, as the rotating blade, two rotating blades arranged in the left-right direction at a certain interval may be provided. According to such a structure, during the cutting operation, the cutting blade can be stably advanced without swaying or wobbling left and right, and the workability can be improved. Furthermore, if the cutting blade can be advanced stably in this way, it is also possible to prevent a situation where, for example, a force in the lateral direction (a direction intersecting the blade) is applied to the cutting blade and the blade is damaged.

[0023] (2) The cutting edge support part is provided with a mechanism for adjusting the gap between the two rotary blades, so as to change the gap between the blades. According to such a structure, for example, for a pipe with a large pipe diameter, the gap between the blades can be widened, or for a pipe with a small pipe diameter, the gap between the blades can be narrowed, etc., so that the cutting edge can be more appropriately applied (in a state closer to perpendicular to the coating) corresponding to the pipe diameter, and it becomes possible to more easily make a cut into the coating, and at the same time, the lateral force (the direction intersecting the blade) applied to the cutting edge can be reduced, and the breakage of the blade can be prevented.

[0024] (3) The carriage part has left front wheels, right front wheels, left rear wheels and right rear wheels as the wheels, and the cutting edge is arranged at a position closer to the center of the carriage part than the left front wheels, right front wheels, left rear wheels and right rear wheels when viewed from the vertical direction. According to such a structure, the cutting edge can be more reliably supported by the carriage part (in other words, the reaction force of the cutting edge pressed against the coating can be stably received by the carriage part), and the carriage part (this device) can be made easier to travel, and the workability can be improved.

[0025] (4) The cutting edge support part has an air cylinder that supports the cutting edge so that the arrangement position of the cutting edge in the vertical direction can be changed, a gas cylinder filled with air that drives the air cylinder, and an air circuit that supplies the air filled in the gas cylinder to the air cylinder and switches the driving direction of the air cylinder in the vertical direction. According to such a structure, since it is not necessary to connect a power cord, an air hose (compressor and air piping), etc. to the device, it becomes possible to perform the cutting operation at the work site without selecting the device alone, and it is possible to efficiently perform the cutting operation without being bothered (obstructed) by the cord or hose. Also, by adjusting the air pressure of the gas cylinder, an appropriate pressing force of the cutting edge against the target coating can be obtained.

[0026] Note that the above "air" does not only mean air, but this "air" is a concept including various gases that can drive an air cylinder, and the air filled in the gas cylinder may be a gas other than air (for example, carbon dioxide, etc.).

[0027] (5) The cutting device has a rod-shaped handle bar for running the carriage unit. To run the carriage unit, it is also possible to use other methods such as pulling with a wire rope or installing a motor to make it self-propelled. When moving or rotating the lining pipe, the means for running the carriage unit is not necessarily required. However, if the above-mentioned handle bar is provided, the device (carriage unit) can be moved forward and backward by pushing and pulling the handle bar. Also, if the handle bar is lengthened, the device can reach the inner part of the pipe where the hand cannot reach and perform the cutting operation.

[0028] A typical cutting formation device of the present invention has the structures of (1), (3), (4), and (5) above. In addition to these structures of (1), (3), (4), and (5), the structure of (2) above may also be provided.

Effect of the Invention

[0029] According to the cutting formation device according to the present invention, the cutting operation of the coating can be performed safely and with good workability, and it is possible to form cuts in both the inner coating and the outer coating, and in any direction of the axial direction and the circumferential direction of the pipe.

[0030] Other objects, features, and advantages of the present invention will be clarified by the following description of the embodiments of the present invention based on the drawings. In each figure, the same reference numerals indicate the same or corresponding parts.

Brief Explanation of the Drawings

[0031]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

DETAILED DESCRIPTION OF THE INVENTION

[0032] A notch forming device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 10. In each figure, the orientation of the device is indicated by appropriately showing two-dimensional orthogonal coordinates or three-dimensional orthogonal coordinates indicating the front-rear, left-right, up-down directions.

[0033] As shown in FIGS. 1 to 10, a notch forming device 11 according to an embodiment of the present invention is capable of making a notch in a coating 3 of a lining pipe 1 in which a coating 3 is formed on the surface (inner peripheral surface and outer peripheral surface) of a pipe body 2. The device includes a cutting blade 16, a cutting blade support portion 17 that supports the cutting blade 16 so that the height position (vertical position) of the cutting blade 16 can be changed, a carriage portion 12 that moves the cutting blade 16 together with the cutting blade support portion 17, and a handle bar 15 for operating (running) the carriage portion 12.

[0034] The carriage portion 12 includes a carriage main body 12a made of a flat plate member having a rectangular planar shape, wheels 13 (left front wheel 13a, right front wheel 13b, left rear wheel 13c, and right rear wheel 13d) provided on the front, rear, left, and right of the carriage main body 12a (at the four corners of the carriage main body 12a like a four-wheeled vehicle) so as to be able to run in the front-rear direction, and a handle connection portion 14 for connecting the handle bar 15. By pulling the handle bar 15, it can run forward, and by pushing the handle bar 15, it can run backward. The handle bar 15 is a rod-shaped member and is detachable from the handle connection portion 14.

[0035] The cutting blade 16 is composed of two rotating blades 16a and 16b that are rotatably supported around a rotation axis extending in the left-right direction. These two cutting blades 16a and 16b are arranged side by side left and right in parallel with each other and at the same height position. It is also possible to change the interval between the two cutting blades 16a and 16b. For example, the number of washers 24 (see FIG. 2) interposed between the support head portion 18 (described later) and each of the cutting blades 16a and 16b can be changed, or they can be replaced with washers of different thicknesses. Further, a plurality of types of support head portions 18 with different intervals between the cutting blades 16a and 16b can be prepared and exchanged.

[0036] The cutting edge support portion 17 that supports the cutting edge 16 on the upper surface side (upper side) of the carriage body 12a includes a support head portion 18 that rotatably supports the cutting edge 16, an air cylinder 19 that changes the support position (height position) of the cutting edge 16 by moving the support head portion 18 in the vertical direction, a cylinder 20 filled with air that drives the air cylinder 19, and an air circuit that connects the cylinder 20 and the air cylinder 19. The support head portion 18 is provided at the upper end of the piston rod 19b of the air cylinder 19. The cylinder 20 is detachably installed on the bottom surface (lower surface) of the carriage body 12a so that it can be replaced when the air is used up.

[0037] The air cylinder 19 is a double-acting air cylinder, and includes a cylinder body 19a including a cylinder tube, a piston provided with a piston rod 19b and housed in the cylinder tube, and an air supply / discharge port (air supply port and exhaust port) that supplies and discharges air to / from the cylinder tube.

[0038] The air circuit includes a manual switching valve (direction switching valve) 21 that switches the flow of air supplied from the cylinder 20 to the air cylinder 19, an air tube (pipe) 23a that connects the cylinder 20 and the switching valve 21, and air tubes (pipes) 23b, 23c that connect the switching valve 21 and the cylinder body 19a (cylinder tube). To switch the air flow, the switch 22 on the upper surface of the switching valve 21 may be operated.

[0039] Specifically, when the switch 22 is tilted to one side, air is supplied from the cylinder 20 to the upper side of the piston in the cylinder tube via the switching valve 21, and air is discharged from the lower side of the piston in the cylinder tube. As a result, the piston rod 19b contracts downward and the cutting edge 16 moves downward.

[0040] On one hand, when the switch 22 is tilted to the other side, air is supplied from the cylinder 20 to the lower side of the piston in the cylinder tube via the switching valve 21, and air is discharged from the upper side of the piston in the cylinder tube. As a result, the piston rod 19b extends upward and the cutting blade 16 moves upward. In addition, in the state where the cutting blade 16 is raised, the piston rod 19b (and thus the cutting blade 16 as well) is biased upward by the air supplied to the cylinder tube (lower side of the piston), and thereby the cutting blade 16 is pressed against the coatings 3a, 3b of the lining tube 1 and the tube wall (the wall surface of the tube body 2).

[0041] The cutting device 11 according to the present embodiment can form cuts in the axial direction of the tube and cuts in the circumferential direction of the tube with respect to the coating (inner coating) 3a formed on the inner surface of the lining tube 1 and the coating (outer coating) 3b formed on the outer surface, respectively, by being used in the following first to fourth usage modes.

[0042] (a) First usage mode To form a cut in the axial direction of the inner coating 3a, as shown in FIGS. 3 and 4, the device 11 is arranged inside the tube 1 so that the front - rear direction of the device 11 coincides with the axial direction of the tube (the extending direction of the tube axis 1a). Also, when arranging the device 11 inside the tube 1, after operating the switch 22 of the switching valve 21 to lower the cutting blade 16, the device 11 is placed inside the tube 1, and then the switch 22 is operated to raise the cutting blade 16 and press the cutting blade 16 against the inner surface of the tube 1. Then, in this state, the handle rod 15 is used to advance the device 11 deeper (backward) into the tube 1 (see arrow L). As the device 11 advances, the cutting blade 16 pressed against the inner surface of the tube rolls (moves while rotating so as to roll on the inner surface of the tube) and cuts the coating 3a. As a result, the inner coating 3a is cut by the cutting blade 16 (16a, 16b), and a cut in the direction of the tube axis 1a can be formed with respect to the inner coating 3a.

[0043] After rotating the lining pipe 1 or the present apparatus 11 around the pipe axis 1a, by repeating the above cutting operation, it is possible to form a plurality (4, 6, 8 or more) of cuts extending in the pipe axis 1a direction in the inner coating 3a.

[0044] (b) Second usage mode To form a cut in the circumferential direction of the inner coating 3a, as shown in FIGS. 5 and 6, the present apparatus 11 is arranged in the pipe 1 so that the left - right direction of the present apparatus 11 coincides with the pipe axis 1a direction. When arranging the apparatus 11 in the pipe 1, the switch 22 of the switching valve 21 is operated to lower the cutting blade 16 as in the first usage mode. After installing the present apparatus 11 in the pipe 1, the cutting blade 16 is raised and pressed against the inner coating 3a. In this usage mode, the handle rod 15 is removed. Then, if the lining pipe 1 is rotated around the pipe axis 1a (see arrow R) in this state, a cut in the circumferential direction can be formed in the inner coating 3a.

[0045] Also, when rotating the lining pipe 1, it is only necessary to hold it down so that the present apparatus 11 does not rotate together with the lining pipe 1. Further, as described above, for the cutting operation, it is only necessary that the lining pipe 1 and the present apparatus 11 rotate relative to each other. It is also possible to form a cut in the same way by running (rotating) the present apparatus 11 in the circumferential direction of the pipe without rotating the lining pipe 1 (or by rotating both the pipe 1 and the apparatus 11 in opposite directions to each other).

[0046] (c) Third usage mode To form a cut in the outer sheath 3b in the direction of the pipe axis 1a, as shown in FIGS. 7 and 8, place the cutting device 11 on the floor G, align the longitudinal direction of the cutting device 11 with the direction of the pipe axis 1a, and arrange the lining pipe 1 so as to be placed on the cutting blade 16. At this time, part or all of the self-weight of the lining pipe 1 may be applied to the cutting device 11 (cutting blade 16) (the same applies to the fourth usage mode described below). This is to allow the cutting blade 16 to bite into the outer sheath 3b to more reliably form a cut. Then, if the device 11 is run in the direction of the pipe axis 1a in this state, the outer sheath 3b can be cut by the cutting blade 16 pressed against the outer surface of the pipe, and a cut in the outer sheath 3b in the direction of the pipe axis 1a can be formed.

[0047] Note that, similar to the first usage mode, after rotating the lining pipe 1 around the pipe axis 1a, if the above cutting operation is repeated, a plurality (4, 6, 8 or more) of cuts extending in the direction of the pipe axis 1a can be formed in the outer sheath 3b.

[0048] (d) Fourth usage mode To form a cut in the outer sheath 3b in the circumferential direction of the pipe, as shown in FIGS. 9 and 10, place the device 11 on the floor G, align the left-right direction of the device 11 with the direction of the pipe axis 1a, and arrange the lining pipe 1 so as to be placed on the cutting blade 16. Then, if the lining pipe 1 is rotated around the pipe axis 1a in this state, a cut in the circumferential direction of the pipe can be formed in the outer sheath 3b by the cutting blade 16 pressed against the outer surface of the pipe.

Explanation of reference numerals

[0049] 1 Lining pipe 1a Pipe axis 2 Pipe body 3 Sheath 3a Inner sheath 3b Outer sheath 11 Cutting formation device 12 Cart part 12a Cart body 13 Wheels 13a Left front wheel 13b Right front wheel 13c Left rear wheel 13d Right rear wheel 14 Handle connection part 15 Handle bar 16(16a, 16b) Cutting blade 17 Cutting blade support part 18 Support head part 19 Air cylinder 19a Cylinder body 19b Piston rod 20 Gas cylinder 21 Changeover valve 22 Switch 23a, 23b, 23c Air tube 24 Washer G Floor

Claims

1. A cutting blade for forming a cut in the coating of a lining pipe, A carriage part having wheels on the front, rear, left, and right and capable of traveling in the front-rear direction, A cutting blade support part that supports the cutting blade at an upper position of the carriage part so that the support height can be changed and biases the cutting blade upward, A cut forming device characterized by comprising the above.

2. The cutting blade is a disc-shaped rotary blade rotatably supported by the cutting blade support part The cut forming device according to claim 1.

3. As the rotary blade, two rotary blades arranged in the left-right direction at regular intervals are provided The cut forming device according to claim 2.

4. The cutting blade support part has a blade interval adjustment mechanism for changing the interval between the two rotary blades The cut forming device according to claim 3.

5. The carriage part has left front wheel, right front wheel, left rear wheel, and right rear wheel as the wheels, When viewed from the vertical direction, the cutting blade is arranged at a position closer to the center of the carriage part than the left front wheel, right front wheel, left rear wheel, and right rear wheel The cut forming device according to claim 1.

6. The cutting blade support part, An air cylinder that supports the cutting blade so that the arrangement position of the cutting blade in the vertical direction can be changed, A cylinder filled with air for driving the air cylinder, An air circuit that supplies the air filled in the cylinder to the air cylinder and switches the driving direction of the air cylinder in the vertical direction, Having The cut forming device according to claim 1.

7. A rod-shaped handle bar for running the carriage part is provided The cut forming device according to any one of claims 1 to 6.

8. The carriage part has left front wheel, right front wheel, left rear wheel, and right rear wheel as the wheels, When viewed from the vertical direction, the cutting blade is arranged at a position closer to the center of the carriage part than the left front wheel, right front wheel, left rear wheel, and right rear wheel, The cutting blade support part, An air cylinder that supports the cutting blade so that the arrangement position of the cutting blade in the vertical direction can be changed, A cylinder filled with air for driving the air cylinder, An air circuit that supplies the air filled in the cylinder to the air cylinder and switches the driving direction of the air cylinder in the vertical direction, Having The cut forming device is provided with a rod-shaped handle bar for running the carriage part. The cut forming device according to claim 3 or 4.

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