KR20210064586A - Pipe cutting apparatus - Google Patents

Abstract

A pipe cutting apparatus is disclosed. The pipe cutting apparatus for cutting a pipe comprises: a base; a guide rail installed to be spaced apart from the base; a pipe fixing and rotating part which is installed on the base, has a shape imitation guide having a curved contact surface corresponding to a curved cutting end to be formed on a pipe, and can fix and rotate the pipe, the rotation of the shape imitation guide being made while the pipe rotates; a curved surface cutting guide part of which an end can contact the curved contact surface of the shape imitation guide, and which is installed on the guide rail to reciprocate along the guide rail when the pipe and the shape imitation guide rotate in a state of contacting the contact surface of the shape imitation guide; and at least one cutting part which is installed on the guide rail to be spaced apart from the curved surface cutting guide part so that the at least one cutting part can reciprocate along the guide rail in conjunction with the reciprocating of the curved surface cutting guide part, and cuts the pipe through the supply of a plasma heat source to the pipe. In accordance with the present invention, the pipe cutting apparatus can cut the end of the pipe into a curved shape or a straight shape if needed, and has a simple and compact structure, thereby having excellent field applicability and easy installation.

Description

Pipe cutting apparatus

The present invention relates to a pipe cutting device capable of cutting a pipe to have a curved or straight cross-section.

In general, the plasma cutter generates an electric arc between the electrode and the base material from the nozzle and sprays air, and the air passes through the arc air stream and is ionized by chemical action. High-speed, high-temperature, high-speed, high-temperature, electrons and ions exist in the space at the same density. It becomes plasma, which is jet gas, and this plasma is used to cut the base material.

Among plasma technologies, the plasma cutting machine is the most commonly used at the machining site, and has a high cutting speed compared to a gas cutting machine or a laser cutting machine and can be used for most conductors.

1 is a schematic diagram of a conventional plasma cutting machine.

Referring to Figure 1, the conventional plasma cutter has a chuck 11 for fixing a pipe on one side with respect to the body 10 is formed, and on the other side is connected to the chuck and rotates at the same rotation angle as the chuck (12) is formed The pipe fixed to the chuck 11 is cut by the stylus 16 that supplies a plasma heat source. That is, while the pipe fixed to the chuck 11 rotates, the pipe is cut by the plasma heat source generated from the nib 16 .

However, in the prior art as shown in FIG. 1 , when the pipe fixed to the chuck 11 rotates, the operator manually cuts it using a plasma cutter, so there is a problem that it cannot be precisely cut into a circular cross-section or a curved cross-section. In addition, after cutting, the pipe was manufactured by grinding a circular cross-section or a curved cross-section using a grinder, but this manufacturing process has a problem that it takes a lot of time, is complicated, and is cumbersome. In addition, there was a problem in that the production cost became expensive as the additional step of the polishing process was carried out, and since the polishing process was performed manually, there was a problem that the worker had a lot of force and the efficiency was decreased.

Republic of Korea Registered Utility Model No. 20-0310615 (2003.4.18)

The present invention has been devised to solve the above-mentioned problems of the prior art, and the pipe is cut to have both cross-sections of a curved shape, or one cross-section is cut to have a curved shape and the other cross-section is cut to have a straight shape, or both cross-sections An object of the present invention is to provide a pipe cutting apparatus that can easily change work as needed, such as cutting to have a straight shape, and can increase work efficiency by implementing fast cutting work and omitting a grinding process.

In addition, another object of the present invention is to provide a pipe cutting device that can realize a compact device as a whole by having a simple structure and can simultaneously manufacture at least two or more cut pipes by forming at least two or more cutting parts at the same time. do.

According to one aspect of the present invention, there is provided a pipe cutting device for cutting a pipe, comprising: a base; a guide rail installed to be spaced apart from the base; A shape imitation guide installed on the base and having a curved contact surface corresponding to a curved cutting end to be formed on the pipe is provided, and it is possible to fix and rotate the pipe, but the rotation of the shape imitation guide at the same time as the pipe rotation A pipe fixed rotating part made of this; A guide rail so that one end can contact the curved contact surface of the shape imitation guide, and reciprocate along the guide rail when the pipe and the shape imitation guide are rotated in contact with the contact surface of the shape imitation guide. Curved cutting guide part installed on the; and at least one cutting that is installed on the guide rail to be spaced apart from the curved cutting induction part to be reciprocally moved along the guide rail in conjunction with the reciprocating movement of the curved cutting induction part, and cut the pipe through plasma heat source supply to the pipe A pipe cutting device comprising a portion is provided.

The pipe fixing rotation unit may include: first and second fixing chucks capable of clamping both sides of the pipe; a shaft connecting between the first and second fixing chucks and integrally connected to the first and second fixing chucks, the shaft having a through hole formed therein so that the pipe can pass therethrough; and a shaft driving unit capable of rotating the shaft, wherein the shape imitation guide is provided on the outer surface of the shaft to rotate at the same time as the shaft rotates, and may be installed to be replaceable with respect to the shaft.

The shape imitation guide may include a shape imitation guide housing that is detachably mounted with respect to the shaft; and a plurality of shape imitation rings coupled to the shape imitation guide housing to be spaced apart from each other along the radial direction with respect to the center of the shape imitation guide housing, and each of which has different curved contact surfaces.

The curved cutting guide unit may include: an induction unit body slidably mounted on the guide rail; And it is mounted on the induction part body so as to be approached or spaced apart from the shape imitation guide, it may include a positioning part provided with a rotating plate at the end to be in selective rolling contact with the curved contact surfaces of the plurality of shape imitation rings.

The shape imitation guide may further include an elastic position restoring unit for elastically restoring the position of the curved cutting guide part according to a change in the contact position with the curved contact surface of the guide.

The elastic position restoration unit may include an extension rod extending long in a direction parallel to the guide rail on a side surface of the curved cutting guide unit and having a locking protrusion formed at an end thereof; And one end is supported on the support wall installed on the base to be spaced apart from the locking jaw, and the other end is supported by the locking jaw, so that one end of the curved cutting guide part is always in contact with the curved contact surface of the shape imitation guide to maintain a state. It may include an elastic recovery spring that provides an elastic force.

An interlocking moving rod is provided to be spaced apart from the guide rail, and the curved cutting guide part and the at least one cutting part are connected to the interlocking moving rod to be fixed or released through a clamp, and the curved cutting guide part is fixed to the interlocking moving rod. The at least one cutting part may reciprocate in conjunction with the curved cutting guide part by adjusting the clamping force, or may maintain a fixed position on the guide rail.

According to the pipe cutting device of the present invention described above, the pipe end can be cut in a curved shape or can be cut in a straight shape if necessary, and has a simple and compact structure, so it has excellent field applicability and easy installation. There is one advantage.

In addition, by providing a plurality of shape imitation rings having various curved contact surfaces on the shaft, it is possible to form a pipe cutting surface having various curved shapes through one device.

In addition, by adopting the detachable structure of the shape imitation guide, the shape imitation ring having various curved contact surfaces can be appropriately changed and applied as needed, so that various curved cutting ends can be formed at the end of the pipe.

1 is a schematic diagram showing a conventional plasma cutting machine;
2 is a view showing various end shapes of a pipe cut using a pipe cutting device according to an embodiment of the present invention;
3 is a side view showing a pipe cutting device according to an embodiment of the present invention;
Figure 4 is a plan view of Figure 3;
5 is a partial cross-sectional view of a pipe cutting device according to an embodiment of the present invention;
6 is a perspective view showing a shape imitation guide of a pipe cutting device according to an embodiment of the present invention;
7 is a view showing the difference of the curved contact surface by developing various shape imitation rings of the shape imitation guide of the pipe cutting device according to the embodiment of the present invention;
8 is an enlarged cross-sectional view of region VIII of FIG. 4;
9 is a view showing a state in which various shape imitation rings can be selectively contacted by adjusting the arrangement position of the end of the curved cutting guide part in the pipe cutting apparatus according to the embodiment of the present invention;
10 is a view showing that in the pipe cutting apparatus according to an embodiment of the present invention, the curved cutting guide part elastically reciprocates in the left and right direction according to the rotation of the shape imitation guide in a state in which the curved contact surface of the shape imitation guide and the curved cutting guide part are in contact with each other. a drawing showing
11 to 13 show the state of mutual contact between the curved contact surface of the shape imitation guide and the curved cutting guide part in the pipe cutting device according to the embodiment of the present invention, the curved cutting guide part for the interlocking moving rod, and the clamping state of the two cutting parts, etc. It is a view showing a state in which cut surfaces of various shapes are formed at both ends of the pipe along the

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and the scope of the invention to those of ordinary skill in the art will be completely It is provided to inform you. In the drawings, like reference numerals refer to like elements.

The pipe cutting device according to a preferred embodiment of the present invention is made to cut the pipe end in a curved shape or a straight shape if necessary. It has a simple and compact structure, so it has excellent field applicability and easy installation. There is one advantage.

In other words, in the present invention, both ends of the pipe can be cut in a curved shape, and in contrast, one end can be cut in a curved shape and the other end can be cut in a straight shape, and in contrast, both ends of the pipe can be cut in a straight shape. It is possible to provide a variety of cutting operations as it has a structure that can be used.

Hereinafter, the present invention will be described in detail with reference to embodiments. For convenience of explanation, the case in which both end portions are cut in a curved shape will be described as a reference, and the remaining cases will be separately described below.

3 and 4, the pipe cutting device according to the embodiment of the present invention includes a base 100, a guide rail 200, a pipe fixed rotation part 300, a curved surface cutting guide part 400, and at least one It includes a cutting unit 600 .

First, the base 100 is made to provide an installation area in which the main components of the apparatus are installed, and the guide rail 200 is spaced apart from one side in a direction substantially parallel to the arrangement direction of the pipe.

Next, as shown in FIGS. 3 to 5 , the pipe fixing and rotating part 300 is installed on the base 100 to fix the pipe P and rotate it, and substantially implement a curved cutting end in the pipe. The shape imitation guide 340 to be described later has a structure in which the pipe (P) rotates and rotates at the same time.

Specifically, as shown in FIG. 5 , the pipe fixed rotating unit 300 includes first and second fixed chucks 310 and 311 , a shaft 320 , a shaft driving unit 330 , and a shape imitation guide 340 .

First, the first and second fixing chucks 310 and 311 are installed spaced apart from each other to clamp both sides of the pipe P, and hydraulic / pneumatic pressure is supplied through a separate supply device (not shown) to automatically clamp / unclamp. It may be made of a possible structure, and in some cases, a structure that is manually clamped/unclamped by an operator is applicable.

Next, the shaft 320 connects between the first and second fixing chucks 310 and 311 and is integrally connected to the first and second fixing chucks 310 and 311 and the through hole 321 so that the pipe P can penetrate therein. ) is formed. Here, the shaft 320 inserts a skinless bolt or the like into the coupling hole formed in the first and second fixing chucks 310 and 311, and applies a method in which the skinless bolt presses the outer surface of the shaft 320 to the first and second It can be rotated integrally with the stationary chuck. However, it goes without saying that various coupling structures other than the above-described headless bolts may be applied to this integral fixed coupling.

Next, the shaft driving unit 330 rotates the shaft 320 and may be provided in a separate case 110 provided on the base 100 so as not to be exposed to the outside as shown in FIG. 5 . As will be described again below, the inner wall of the case 110 may function as a support wall 120 on which one end of an elastic restoration spring to be described below is contacted and supported for restoring the elastic position of the curved cutting guide part 400 to be described later.

The shaft driving unit 330 includes a motor 331 , a first timing pulley 332 connected to a drive shaft of the motor 331 , a second timing pulley 333 provided integrally on the outer surface of the shaft 320 , and a first timing pulley and a timing belt 334 connecting between the and the second timing pulley, and the motor driving force is transmitted to the shaft 320 through the timing pulley and the belt to rotate the shaft.

On the other hand, as shown in FIG. 5, a belt tension adjusting unit 335 for adjusting the tension of the timing belt 334 may be further provided in the case 110, and the belt tension adjusting unit 335 is the case (110) a tension shaft 336 fixed to the inner wall, a tension roller that is provided to be freely rotatable by interposing a bearing at the end of the tension shaft 336 and is in contact with the inner surface of the timing belt 334 to adjust the tension of the timing belt (337).

On the other hand, bearing support 338 is provided on both sides of the case 110 to more stably support the rotation of the shaft 320 .

Next, as shown in FIGS. 5 to 7, the shape imitation guide 340 is a curved contact surface 341 corresponding to the curved cutting end PC to be formed at one or both ends of the pipe P. It is made to have, and is fixed to the outer surface of the shaft 320 so as to rotate at the same time when the shaft 320 rotates.

As shown in FIGS. 5 and 6 , the shape imitation guide 340 includes a shape imitation guide housing 342 mounted on the shaft 320 and a radial direction of the shape imitation guide housing 342 based on the central axis of the shape imitation guide housing 342 . A plurality of shape imitation rings 343 coupled to the shape imitation guide housing 342 to be spaced apart from each other are included.

Here, as shown in FIGS. 6 and 7, the plurality of shape imitation rings 343 have different curved contact surfaces 341, respectively, and as will be described later, the curved surface to which the curved cutting guide part 400 is in contact. By transforming the shape contact surface 341, it is possible to create a cutting end PC having various curved shapes at the end of the pipe P. A detailed description of the process of forming the curved cutting end will be described later.

The plurality of shape imitation rings 343 can be fixedly coupled to the shape imitation guide housing 342 through a screw or the like, and although three are illustrated in the related drawings, the number is not limited thereto, and the number can be increased or decreased.

On the other hand, in the embodiment of the present invention, the shape imitation guide housing 342 is detachably mounted with respect to the shaft 320, for example, a plurality of through holes along the outer circumferential direction of the shape imitation guide housing 342. After forming, a structure in which a skinless bolt or the like is fastened to the through hole so that the skinless bolt presses the outer surface of the shaft 320 may be applied.

Through this fastening structure, the operator can remove the first fixing chuck 310 from the shaft 320, release the fastening of the headless bolt, and withdraw the shape imitation guide housing 342 from the shaft to separate it.

Conversely, when the shape imitation guide housing 342 is to be fixedly coupled to the shaft 320, the shape imitation guide housing is inserted into the preset position of the shaft, and then a skinless bolt, etc. is inserted into the through hole, and the hairless bolt By pressing the outer surface of the shaft 320 , it is possible to simultaneously rotate the shape imitation guide housing 342 and the shape imitation ring 343 simultaneously with the rotation of the shaft 320 .

As such, the present invention employs the detachable structure of the shape imitation guide 340, so that various shape imitation rings 343 having various curved contact surfaces 341 can be appropriately changed and applied as needed. ) There is an advantage that the cutting end (PC) of various curved shapes can be formed at the end.

Next, as shown in FIGS. 4, 8 and 9 , the curved cutting guide part 400 is installed on the guide rail 200 and one end is in contact with the curved contact surface 341 of the shape imitation guide 340 . is done That is, the curved cutting guide part 400 may be in contact or non-contact with the curved contact surface 341 , and if you want to form a curved cutting end at the end of the pipe (P), keep it in contact and cut a straight line. When the end PS is to be formed, the state may be changed to be non-contact.

In the embodiment of the present invention, the curved cutting guide part 400 has one end in contact with the curved contact surface 341 of the shape imitation guide 340, and the pipe P and the shape imitation guide 340 are rotated. When made, it is possible to reciprocate along the guide rail 200 by the elastic restoring force of the elastic position restoring part 500 to be described later in addition to the curved shape of the curved contact surface.

When describing the structure of the curved cutting guide part 400 in detail, as shown in FIGS. 8 and 9, the curved cutting guide part 400 is a guide part body 410 that is slidably mounted on the guide rail 200, It includes a positioning unit 420 mounted on the guide body 410 to be approached or spaced apart from the shape imitation guide 340 .

A through hole is formed in the induction part body 410 so that the positioning part 420 passes therethrough, a plurality of grooves are formed on the outer surface of the positioning part 420 in the longitudinal direction, and the positioning part 420 is formed in the induction part body 410 . ), an insertion hole of a ball plunger structure is provided so that it can be elastically inserted into the plurality of grooves. In addition, a rotation plate 430 freely rotatable by a bearing is provided at the end of the positioning unit 420 to selectively roll contact with the curved contact surface 341 of the plurality of shape imitation rings 343 .

Therefore, as shown in FIG. 9, the operator pushes the rear end of the positioning unit 420 toward the shaft 320 or pulls it in the opposite direction to the curved surface of the shape imitation ring 343 in contact with the rotating plate 430. The shape of the contact surface 341 can be varied, and according to the change of the contact surface, the curved cutting end of the pipe end can be variously changed and formed.

On the other hand, as will be described in detail below, in order to form the curved cutting end of the pipe, 1) the pipe is rotated, and 2) the cutting part 600 to be described later cuts a predetermined area of the pipe is used to determine the longitudinal direction of the pipe. Accordingly, it is necessary to satisfy the condition for round-trip movement in a predetermined section.

In order to satisfy these conditions, in the present invention, 1) the pipe is rotated through the pipe fixed rotation part 300, and 2) the curved cutting guide part contacts the curved shape contact surface of the shape imitation guide when the shape imitation guide rotates according to the pipe rotation. The structure adopts a structure in which the cutting part, which will be described later, moves reciprocally along the length direction of the pipe in conjunction with the reciprocating movement of the curved cutting guide part.

2) When the structure for implementing the function is described in detail, as shown in FIGS. 8 to 10 , the curved cutting guide part according to the change in the contact position with the curved contact surface 341 of the shape imitation guide 340 ( An elastic position restoration unit 500 for elastically restoring the position, that is, elastically reciprocating along the guide rail, is provided.

Specifically, the elastic position restoration unit 500 extends long in a direction parallel to the guide rail 200 on the side surface of the curved cutting guide unit 400 and an extension rod 520 having a locking protrusion 510 formed at the end thereof, and, One end is supported by the support wall 120 on the base 100 and the other end is supported by the clasp 510 so that one end (the rotating plate 430) of the curved cutting guide part 400 (the rotating plate 430) is the curved surface of the shape imitation guide 340. It includes an elastic recovery spring 530 that provides an elastic force to maintain a state of always in contact with the shape contact surface 341 (maintaining a state to move in the right direction in the drawing). Here, the support wall 120 is applicable as a wall of one side of the case 110 that covers the rotational power means (timing belt, pulley, etc.) for rotating the pipe P so that it is not exposed to the outside, and the stopping protrusion 510 ) and are spaced apart from each other by a certain distance.

Accordingly, as shown in FIG. 10, when the rotating plate 430 of the curved cutting guide part 400 is in contact with the highest surface (the highest protruding position) of the curved contact surface 341 of the shape imitation guide, curved cutting in the drawing As the induction part 400 moves in the left direction, the elastic recovery spring 530 is compressed, and when the rotating plate 430 moves to the bottom side of the curved contact surface 341 of the shape imitation guide, the elastic recovery spring ( 530), the curved cutting guide part 400 moves in the right direction in the drawing, and this left and right movement is repeatedly performed.

3 and 4, the cutting unit 600 supplies a plasma heat source to the pipe (P) to substantially cut the pipe, and the guide rail ( At least one is installed on the guide rail 200 to be spaced apart from the curved cutting guide part 400 so as to reciprocate along the 200). The cutting unit 600 is a plasma cutting machine, and its plasma emitting structure and cutting principle are obvious to those skilled in the art, and detailed descriptions thereof will be omitted below. In the embodiment of the present invention, two cutting units 600 are provided to be left and right spaced apart from each other around the curved cutting guide unit 400 so that two places of the pipe P can be cut at the same time. More than that number may be installed. Hereinafter, for convenience of description, a case in which two are installed will be described.

3, 4, and 11 to 13, the interlocking moving rod 610 is provided to be spaced apart from the guide rail 200, and the curved cutting guide part 400 and the two cutting parts 600 are clamped. It is connected to the interlocking moving rod 610 so that it can be fixed or released. Here, the clamp is applied as a part in which the operator can manually adjust the fastening force.

That is, when the curved cutting guide part 400 is fixed to the interlocking moving rod 610 and the two cutting parts 600 are firmly clamped by adjusting the clamping force, the curved cutting guide part 400 can be interlocked and reciprocally moved. In the case of unclamping, it is possible to maintain a fixed position on the guide rail 200 without interlocking and moving at the same time.

As an example, both ends of the pipe can be cut in a curved shape as shown in FIG. 11 by firmly clamping both the curved cutting guide part 400 and the two cutting parts 600 to the interlocking moving rod 610 . As another example, by firmly clamping the curved cutting guide part 400 to the interlocking moving rod, firmly clamping only one of the two cutting parts 600 and unclamping the other one, as shown in FIG. 12, only one end of the pipe has a curved shape. It can be cut and the other end can be cut straight. As another example, as shown in FIG. 13 by releasing the contact state between the curved cutting guide part 400 and the shape imitation guide 340 and clamping or unclamping both the two cutting parts 600 to the interlocking moving rod 610, as shown in FIG. Both ends of the pipe can be cut in a straight line.

On the other hand, in the embodiment of the present invention as described above, since the two cutting units 600 are provided, the pipe can be cut into two unit cutting pipes at the same time, thereby increasing the cutting operation efficiency. Explain.

As shown in Figures 3 and 4, the base 100 is in contact with the end of the pipe (P) continuously supplied from the pipe supply device (not shown, for example, a pipe supply roller, etc.) in the supply direction no more A stopper 130 capable of restricting movement is provided.

This stopper 130 is in contact with the end of the pipe (P) being transported and supplied for cutting, and a pipe end support 131 that can support the pipe end in a rotating state, and the pipe end support 131 is connected to the base ( 100) includes a stopper rotating bar 132 that is rotatably installed through a separate bracket, and an operator can manually or automatically rotate the stopper rotating bar 132 to limit the transport of the pipe.

In the embodiment of the present invention, for example, after applying the same distance between the pipe end support part 131 and the cutting part 600 on the right side in the drawing and the distance between the two cutting parts as each other, the two cutting parts 600 are cut. It is possible to simultaneously drive two unit cutting pipes to be formed at the same time, and as described above, the curved cutting guide unit 400 for the interlocking moving rod 610 and the clamping force of the two cutting units 600 are adjusted to cut two units. A curved cutting end may be formed at both ends or one end of the pipe, or a straight cutting portion may be formed at both ends of the pipe. Of course, since the pipe end supported in contact with the pipe end support part 131 during the initial operation is in the state of straight cutting, which is the initial manufacturing state of the pipe, the above-described end molding can be continuously performed after the initial cutting operation.

Although the present invention has been described with reference to the accompanying drawings and the above-described preferred embodiments, the present invention is not limited thereto, but is defined by the following claims. Accordingly, those of ordinary skill in the art can variously change and modify the present invention within the scope without departing from the spirit of the claims to be described later.

P: pipe 100: base
130: stopper 200: guide rail
300: pipe fixed rotating part 320: shaft
330: shaft driving unit 340: shape imitation guide
341: curved contact surface 342: shape imitation guide housing
343: shape imitation ring 400: curved surface cutting guide part
420: positioning unit 430: rotating plate
500: elastic position restoration unit 530: elastic restoration spring
600: cutting unit 610: interlocking moving rod

Claims (7)

A pipe cutting device for cutting a pipe, comprising:
base 100;
a guide rail 200 installed to be spaced apart from the base 100;
It is installed on the base 100, and a shape imitation guide 340 having a curved contact surface 341 corresponding to a curved cutting end PC to be formed on the pipe P is provided, and the pipe is fixed to It is possible to rotate the pipe fixed rotation unit 300, the rotation of the shape imitation guide 340 is made at the same time as the pipe rotation;
The shape imitation guide 340 is made to be in contact with the curved contact surface 341 of the guide 340 and one end thereof is in contact with the pipe P and the shape imitation in a state of contact with the curved contact surface 341 of the shape imitation guide 340 . When the guide 340 is rotated, the curved cutting guide part 400 is installed on the guide rail to reciprocate along the guide rail 200; and
At least one is installed on the guide rail 200 to be spaced apart from the curved cutting induction part 400 so as to be reciprocally moved along the guide rail 200 in conjunction with the reciprocating movement of the curved cutting induction part 400, and a plasma heat source with a pipe A pipe cutting device comprising at least one cutting unit 600 for cutting a pipe by supplying it. According to claim 1,
The pipe fixed rotating part 300,
first and second fixing chucks 310 and 311 capable of clamping both sides of the pipe (P);
a shaft 320 connecting between the first and second fixing chucks and integrally connected to the first and second fixing chucks and having a through hole 321 formed therein so that the pipe P can pass therethrough; and
and a shaft driving unit 330 capable of rotating the shaft 320,
The shape imitation guide 340 is provided on the outer surface of the shaft so as to rotate at the same time as the shaft rotates, and is installed so as to be replaceable with respect to the shaft. 3. The method of claim 2,
The shape imitation guide 340,
a shape imitation guide housing 342 that is detachably mounted with respect to the shaft 320; and
A plurality of shape imitation guide housings 342 are coupled to each other to be spaced apart from each other along the radial direction with respect to the center of the shape imitation guide housing 342, and a plurality of shape imitation in which different curved contact surfaces 341 are formed, respectively. A pipe cutting device comprising a ring (343). 4. The method of claim 3,
The curved surface cutting induction part 400,
a guide body 410 slidably mounted on the guide rail 200; and
It is mounted on the induction part body 410 so as to be accessible or spaced apart from the shape imitation guide 340, and at the end of the plurality of shape imitation rings 343, a curved contact surface 341 and a rotating plate to be in selective rolling contact ( Pipe cutting device, characterized in that it comprises a position adjusting unit (420) is provided (430). According to claim 1,
The shape imitation guide 340 further comprises an elastic position restoration unit 500 for resiliently restoring the position of the curved surface cutting guide unit 400 according to a change in the contact position with the curved contact surface 341 of the guide 340. pipe cutting device. 6. The method of claim 5,
The elastic position restoration unit 500,
an extension rod 520 extending long in a direction parallel to the guide rail 200 on a side surface of the curved cutting guide part 400 and having a locking protrusion 510 formed at an end thereof; and
On the base 100, one end is supported by the support wall 120 installed to be spaced apart from the locking jaw 510, and the other end is supported by the locking jaw, so that one end of the curved cutting guide part 400 is the shape imitation guide ( Pipe cutting device, characterized in that it comprises an elastic restoring spring (530) that provides an elastic force to always maintain a state in contact with the curved contact surface (341) of the 340). According to claim 1,
An interlocking moving rod 610 is provided to be spaced apart from the guide rail 200, and the curved cutting guide part 400 and the at least one cutting part 600 are fixed to or released from the interlocking moving rod 610 through a clamp. In a state in which the curved cutting guide part 400 is fixed to the interlocking moving rod 610, at least one cutting part 600 adjusts the clamp fastening force to interlock with the curved cutting guide part 400 to reciprocate or guide A pipe cutting device, characterized in that it maintains a fixed position on the rail (200).

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