Portable pipe cutting device

Abstract

To reduce man-hours for pipe cutting work and to cope with a narrow space.SOLUTION: A portable pipe cutting device 10 includes a cutting tool 20 that cuts a pipe 1, a pair of attachment members 61 and 62 that are attached to both axial end surfaces of the pipe 1, and a linear motion device 30 that is attached so as to bridge the pair of attachment members 61 and 62 and moves the cutting tool 20 in a pipe axial direction by motor driving, and the portable pipe cutting device cuts the pipe 1 fixed to the pair of attachment members 61 and 62 in the pipe axial direction by moving the cutting tool 20 in the pipe axial direction between the pair of attachment members 61 and 62.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a technique for cutting a pipe in the pipe axial direction. [Background technology]

[0002] There is a need to cut pipes during demolition work of nuclear power plants, etc. Patent Document 1 discloses a device for cutting pipes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-007483 Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention aims to reduce the number of steps required for pipe cutting work and to accommodate small spaces. [Means for solving the problem]

[0005] (1) A portable pipe cutting device includes a cutting tool for cutting a pipe, a pair of mounting members attached to both axial end faces of the pipe, and a linear motion device attached so as to bridge the pair of mounting members and driven by a motor to move the cutting tool in the pipe axial direction, and by moving the cutting tool in the pipe axial direction between the pair of mounting members, the pipe fixed to the pair of mounting members is cut in the pipe axial direction. In (1), any configuration other than the above is optional and may be used.

[0006] The configuration (1) is portable and compact, making it possible to perform cutting work in small spaces. In addition, because it is capable of automatic cutting, it is expected to reduce the amount of work required when cutting a large number of pipes.

[0007] (2) In the pipe cutting device described in (1), the pair of mounting members may be provided with rollers that contact the outer peripheral surface of the pipe and threaded portions that contact the inner peripheral surface of the pipe. The rollers and the threaded portions may be fixing portions that fix the pipe by clamping the pipe from both sides in the thickness direction. The threaded portions may be rotatable relative to the mounting members. The configuration of (2) allows adjustment of how the screw tip contacts the inner surface of the pipe, making it possible to accommodate mounting to pipes 1 of different sizes.

[0008] (3) The pipe cutting device described in (1) or (2) may have a connecting member that connects the pair of mounting members. The configuration of (3) makes it easy to achieve parallelism when the mounting members are attached to the pipe. Therefore, it becomes possible to easily perform the attachment work to the pipe.

[0009] (4) The pipe cutting device according to any one of (1) to (3) may have an adjustment mechanism for adjusting the mounting angle or mounting height of the cutting tool relative to the linear motion device. The configuration of (4) allows the position of the cutting edge of the rotary blade relative to the pipe to be adjusted, thereby maintaining good sharpness.

[0010] (5) In the pipe cutting device described in any one of (1) to (4), the linear motion device may have a linear guide, a ball screw mechanism, and a metal fitting for fixing the mounting member. The metal fitting may be slidable in the pipe axial direction relative to the guide frame of the linear guide. According to the configuration of (5), the distance between the two mounting members can be adjusted to match the length of the pipe to be cut. [Effects of the Invention]

[0011] This technology enables automatic cutting, which is expected to reduce the amount of work required when cutting large quantities of pipes. In addition, the device can be attached to pipes and is portable and compact, making it possible to work in small spaces. [Brief explanation of the drawings]

[0012] [Figure 1] Perspective view of a pipe cutting device [Figure 2] Front view of the pipe cutting device (viewed from direction A in Figure 1) [Figure 3] Side view of the pipe cutting device (viewed from direction B in Figure 1) [Figure 4] The pipe cutting device cut at part C in Figure 3. [Figure 5] Diagram showing the structure of a linear guide [Figure 6] A diagram showing the support structure of the cutting tool [Figure 7] Bottom view of the pipe cutting device [Figure 8] Diagram showing the piping fixing structure [Figure 9] A diagram showing the device main body separated from the piping DETAILED DESCRIPTION OF THE INVENTION

[0013] <Embodiment> 1. Configuration of pipe cutting device FIG. 1 is a perspective view of a pipe cutting device 10. The pipe cutting device 10 is portable and one of its features is that it can be attached to a pipe 1 for use. The pipe cutting device 10 can be widely used for cutting pipes. Although not limited to specific applications, the pipe cutting device 10 is suitable for cutting large metal pipes used in power plants and the like. In the following description, the axial direction of the pipe 1 is defined as the X direction, and the direction perpendicular to this is defined as the Y direction. The vertical direction is defined as the Z direction.

[0014] The pipe cutting device 10 includes a cutting tool 20 for cutting the pipe 1, a linear motion device 30, and a pair of mounting members 61, 62.

[0015] The cutting tool 20 includes a disk-shaped rotary blade 21 having teeth on its outer periphery, a cover 22 that covers the rotary blade 21, a holder 23 that rotatably supports the rotary blade 21, and a motor 25. The motor 25 drives the rotary blade 21 and is located above the linear motion device 30. The motor 25 may be electrically driven or air-driven. In this embodiment, air-driven motor is used.

[0016] The linear motion device 30 is a device that reciprocates the cutting tool 20 in the X direction along the axis of the pipe 1 by being driven by a motor. In this embodiment, the linear motion device 30 is composed of a linear guide 31, a ball screw mechanism 41, and a motor 45, as shown in FIG. 4. The motor 45 drives the ball screw mechanism 41 and is located at the rear end of the ball screw mechanism 41. The motor 45 may be electrically driven or air-driven. In this embodiment, air-driven motor is used. Reference numeral 46 shown in FIG. 4 denotes a regulator for adjusting air pressure.

[0017] The linear guide 31 is a guide mechanism (slide mechanism) in the X direction, and includes a guide frame 32, a rail 35, and sliders 36 and 37, as shown in FIG.

[0018] The guide frame 32 is made of metal. The guide frame 32 is a rectangular pillar that is long in the X direction, and a groove 32A that is long in the X direction is provided on each of the four side surfaces. In addition, a handle 33 is provided on each of the end surfaces in the X direction. The handle 33 is for portability (for carrying the device).

[0019] The rail 35 is elongated in the X direction and is attached to the side of the guide frame 32. The sliders 36 and 37 are slidably fitted onto the rail 35. The two sliders 36 and 37 are connected by a plate-shaped connecting plate 38.

[0020] 4, the ball screw mechanism 41 is composed of a ball screw shaft 42 and a ball nut 43. The ball screw shaft 42 is axially long in the X direction and is held on the side surface of the guide frame 32 via a bearing 42A.

[0021] The ball nut 43 is threaded onto the outer periphery of the ball screw shaft 42. The ball nut 43 is coupled via a bracket 44 to a connecting plate 38 that connects the two sliders 36 and 37.

[0022] 4, a metal support base 51 is attached to connecting plate 38. Support base 51 is a support member that supports cutting tool 20.

[0023] When ball screw shaft 42 is rotated by driving motor 45, cutting tool 20 supported by support base 51 can be moved horizontally in the X direction as a whole while receiving the guiding action of linear guide 31.

[0024] In this embodiment, as shown in Fig. 6, support base 51 supports cutting tool 20 in an angle-adjustable manner. Specifically, holder 23 of cutting tool 20 is supported on arm 51A of support base 51 in a state where it can rotate around hinge H. Holder 23 is provided with a screw portion 53.

[0025] By manipulating the screw portion 53, the shaft portion 53A extends and retracts, making it possible to adjust the mounting angle θ of the cutting tool 20 relative to the support base 51. In this way, the position (depth) of the cutting edge relative to the pipe 1 can be adjusted. The screw portion 53 is an example of the "adjustment mechanism" of the present invention. The symbol O in Figure 6 is the center of rotation of the cutting blade 21.

[0026] 7, a metal fitting 72 is attached to the underside of the guide frame 32, and the mounting member 62 can be attached via a bracket BK. The metal fitting 72 is slidably fitted into the groove 32A of the guide frame 32, and is slidable in the X direction.

[0027] The metal fittings 72 on both the mounting member 61 side and the mounting member 62 side may be slidable, or only one of them may be slidable and the other may not be slidable. Also, both may be non-slidable.

[0028] 2. Mounting structure of pipe cutting device 10 to pipe 1 The mounting members 61 and 62 are members for mounting the pipe cutting device 10 to the pipe 1. The mounting members 61 and 62 are made of metal and have a plate shape extending in the Y direction as shown in Fig. 1. The mounting members 61 and 62 face each other parallel to the X direction and are located on both end surfaces of the pipe 1 in the X direction. In other words, the two mounting members 61 and 62 sandwich the pipe 1 from both sides in the X direction.

[0029] A groove 63 for accommodating the rotary blade 21 is formed in the center of the mounting members 61 and 62 in the Y direction, and fixing portions 65 for fixing the piping are provided on both sides of the groove 63.

[0030] Fixing portion 65 is provided on the inner surface side (facing surface side) of mounting members 61, 62. As shown in Fig. 8, fixing portion 65 is composed of metal roller 66 that contacts the outer peripheral surface of pipe 1 and threaded portion 67 that contacts the inner peripheral surface.

[0031] The threaded portion 67 passes through a rotating body 68 that is rotatably supported by the mounting members 61 and 62. The inner periphery of the through hole on the rotating body 68 side is also threaded, and the threaded portion 67 can be tightened onto the rotating body 68 (movable in the J direction).

[0032] By tightening the screw portion 67, the roller 66 and the screw portion 67 can clamp and fix the pipe 1 from both sides in the thickness direction.

[0033] Furthermore, the threaded portion 67 is rotatable (rotating in the R direction) integrally with the rotating body 68. This allows adjustment of how the tip of the thread contacts the inner surface of the pipe, making it possible to accommodate attachment to pipes 1 of different sizes.

[0034] 9, the pipe cutting device 10 has a connecting rod 71 that connects the two mounting members 61, 62. By providing the connecting rod 71, when the mounting members 61, 62 are attached to the pipe 1, the two mounting members 61, 62 can be more easily aligned in parallel.

[0035] This has the advantage of facilitating the installation of the pipe cutting device 10. The connecting rod 71 is an example of the "connecting member" of the present invention.

[0036] 2.Effectiveness 7 and 9, the pipe cutting device 10 can be attached to the pipe 1 by fixing the mounting members 61 and 62 to the pipe 1 and then fixing the metal fittings 72 on the bottom of the guide frame to the bracket BK with screws 73. The device main body 10A refers to the part of the pipe cutting device 10 excluding the mounting members 61 and 62.

[0037] In this embodiment, the metal fitting 72, which is the mating part of the bracket BK, is slidable in the X direction relative to the guide frame 32. This allows the distance D between the two mounting members 61, 62 to be adjusted to match the length of the pipe 1 to be cut.

[0038] After the attachment to the pipe 1 is completed, the screw portion 53 is operated to adjust the position of the cutting edge of the rotary blade 21 relative to the pipe 1.

[0039] Thereafter, by moving the cutting tool 20 back and forth in the X direction between the pair of mounting members 61, 62 while rotating the rotary blade 21, the pipe 1 fixed to the pair of mounting members 61, 62 can be automatically cut in the pipe axial direction. Line L shown in FIG. 1 indicates the line along which the cutting tool 20 cuts the pipe 1.

[0040] The pipe cutting device 10 can be attached to the pipe 1 and is portable and small, allowing cutting work to be performed in a small space. In addition, because it is capable of automatic cutting, it is expected to lead to a reduction in labor when cutting a large amount of pipe 1.

[0041] 1 shows a configuration in which the pipe cutting device 10 is attached to a half-circumference pipe and cuts it into 1 / 4 circumference, but it can also be attached to a 1 / 4 circumference pipe and cut it into 1 / 8 circumference, and of course it can also be attached to a full circumference pipe and cut it into 1 / 2 circumference.

[0042] <Other embodiments> The present invention is not limited to the embodiments described above and illustrated in the drawings, and the following embodiments, for example, are also included within the technical scope of the present invention.

[0043] (1) In the above embodiment, the mounting angle of cutting tool 20 relative to support base 51 is adjustable, but a mechanism for adjusting the mounting height may also be used. Also, these adjustment mechanisms may be omitted.

[0044] (2) In the above embodiment, the mounting members 61 and 62 are connected by the connecting rod 71, but the connecting rod 71 may be omitted.

[0045] (3) In the above embodiment, the linear guide 31 and the ball screw mechanism 51 are shown as an example of the linear motion device 30. The linear motion device 30 may have a different structure as long as it can move the cutting tool 20 in the tube axis direction (X direction). For example, it may be a linear motor.

[0046] (4) In the above embodiment, as an example of the fixing portion 65 that fixes the pipe 1 to the mounting members 61, 62, a configuration in which the pipe 1 to be cut is clamped between the roller 66 and the screw portion 67 is shown. The fixing portion is not limited to the combination of the roller 66 and the screw portion 67, and other combinations may be used as long as the pipe is clamped and fixed between two members. For example, the pipe may be clamped between two rollers or two screw portions. Furthermore, other structures may be used as long as the pipe can be fixed. [Explanation of symbols]

[0047] 10 Pipe cutting device 20 Cutting tools 21 Rotary blade 23 Holder 25 motor 30 Linear motion device 31 Linear guide 41 Ball screw mechanism 42 Ball screw shaft 43 Ball nut 45 motor 51 Support Base 61, 62 Mounting members 65 Fixed part 66 Laura 67 Threaded section 71 Connecting rod (connecting member) 72 Metal fittings

Claims

1. A portable pipe cutting device, a cutting tool for cutting the pipe; a pair of mounting members attached to both axial end surfaces of the pipe; a linear motion device attached to bridge the pair of attachment members and driven by a motor to move the cutting tool in the pipe axial direction, A portable pipe cutting device that cuts the pipe fixed to the pair of mounting members in the pipe axis direction by moving the cutting tool in the pipe axis direction between the pair of mounting members.

2. The pipe cutting device according to claim 1, The pair of mounting members include: a roller that contacts the outer peripheral surface of the pipe; a threaded portion that contacts the inner circumferential surface of the pipe; the roller and the threaded portion are fixing portions that fix the pipe by sandwiching the pipe from both sides in a plate thickness direction, A portable pipe cutting device, wherein the threaded portion is rotatable relative to the mounting member.

3. The pipe cutting device according to claim 1 or 2, A portable pipe cutting device having a connecting member that connects the pair of mounting members.

4. The pipe cutting device according to claim 1 or 2, A portable pipe cutting device having an adjustment mechanism for adjusting the mounting angle or mounting height of the cutting tool relative to the linear motion device.

5. The pipe cutting device according to claim 1 or 2, The linear motion device is A linear guide, a ball screw mechanism, and a metal fitting for fixing the mounting member are included, The metal fitting is slidable in the pipe axial direction relative to the guide frame of the linear guide.

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