KR20110039748A - Pipe cutting apparatus and method using plasma - Google Patents

Abstract

PURPOSE: A pipe cutting apparatus and a pipe cutting method using plasma are provided to prevent pipe residues from being oxidized and fused on the inner surface of a pipe. CONSTITUTION: A pipe cutting apparatus using plasma comprises a support frame(110), a pair of support rollers, a vertical strut(120), a horizontal arm, a torch fixing unit(150), and a purging unit(170). The support roller is installed in the support frame and is contacted with the outer circumference of the pipe. The vertical strut is installed on the support frame in a vertical direction. The horizontal arm is horizontally installed in the vertical strut to move up and down. The torch fixing unit is installed at the end of the horizontal arm and fixes a plasma torch(160). The purging unit supplies inactive gas from one end of the pipe to the inside of the pipe.

Description

Pipe Cutting Apparatus and Method Using Plasma {Pipe Cutting Apparatus and Method Using Plasma}

The present invention relates to a pipe cutting device, and more particularly to a device for cutting a pipe using a plasma.

In general, pipes are produced in a batch with a certain length and diameter, so they are cut to the length required by industrial sites or connected by welding.

Conventionally, especially the apparatus which cuts a metal pipe is a cold cutting device which cuts a pipe with the cutter which rotates at high speed. Since the cold cutting device cuts the pipe in a mechanical manner, the pipe is securely fixed to the chuck and the pipe is brought into contact with the cutter that rotates at high speed. At this time, in order to completely cut the pipe, the rotating cutter is fixed and the pipe bitten by the chuck is rotated.

Therefore, the larger the diameter of the pipe, the larger the chuck fixing the pipe, and the configuration for rotating the cutter in the circumferential direction of the pipe or the configuration for rotating the chuck also becomes very large and complicated. It becomes difficult to move to. In addition, the size of the chuck or cutter increases in proportion to the diameter of the pipe, and only a pipe having a certain range of diameters can be cut by a chuck or cutter of a certain size, so that the diameter of the chuck or the cutter may vary from several tens of millimeters to several hundred millimeters. In order to cut a pipe, several cutting devices of different specifications should be provided.

On the other hand, the cold cutting device is a structure that cuts the pipe perpendicular to the longitudinal direction, in order to connect the cut pipes with each other by welding beveling (chamfering) to cut the cutting surface at an angle with respect to the longitudinal direction of the pipe at an angle. It should be processed. This beveling process requires additional equipment, and manual beveling takes a very long time, even for skilled workers, for example, to cut and beveling a stainless steel pipe of 700 mm diameter. It takes more than an hour.

In order to solve the problem of such a cold cutting device, a plasma cutting device for cutting a metal pipe with a plasma arc is known (Patent Publication No. 2000-0012752, Patent Publication No. 2007-0105781, etc.). Plasma cutting device is cut by melting the pipe by using high temperature plasma arc, so there is no need to fix the pipe more firmly than the cold cutting device, and the configuration is simple because it only needs to rotate the pipe or the plasma torch while supporting it. The device can cut pipes of various diameters. In addition, since the angle of the cutting surface can be adjusted by adjusting the angle of the plasma torch, a separate beveling process is not required or even a beveling process can be finished in a simple finishing operation.

On the other hand, the plasma cutting apparatus melts and cuts the pipe with a high temperature plasma arc, so that the inner surface of the pipe is contaminated by fusion to the inner surface of the cut pipe. In particular, when the pipe is used as a pipe for supplying DI water or high-purity chemical liquids, the debris fused to the inner surface of the pipe acts as a deadly pollutant and should be removed. It requires cumbersome work such as grinding and scraping the inner surface or cleaning with acid.

On the other hand, although it depends on the dimensional precision of a pipe, generally the cross section of a large diameter pipe is non-circle. Therefore, the spacing between the plasma torch and the pipe is not constant at the time of cutting, so the shape of the cutting surface and the cutting position are nonuniform.

In addition, although the plasma cutting device has a simpler structure and a smaller size than the cold cutting device, the cutting device disclosed in the above-mentioned prior art still has many improvements, such as not being easily moved to a large size.

The present invention is to solve the above problems, an object of the present invention is to provide a plasma pipe cutting device that is easy to remove the contamination because the debris that is melted and scattered during plasma cutting is not fused to the inner surface of the pipe. In addition, the present invention is to provide a plasma pipe cutting device capable of precisely cutting a non-circular pipe, the structure is simpler and more compact.

In order to achieve the above object, the present invention blows inert gas such as nitrogen or argon into the pipe during plasma cutting so that the pipe dregs which are melted and scattered are not fused to the inner surface of the pipe.

That is, the pipe cutting method according to an aspect of the present invention is a method of cutting a plasma arc while rotating the pipe, by supplying an inert gas into the pipe at one end in the longitudinal direction of the pipe is melted and scattered by the plasma arc Characterized in that the pipe is cut while preventing the pipe dregs from oxidizing and fusion to the inner surface of the pipe.

In addition, the inert gas may be supplied into the pipe at one end of the pipe in the longitudinal direction, and the inert gas and the pipe dreg may be sucked and exhausted at the other end of the pipe.

In addition, the plasma pipe cutting apparatus according to another aspect of the present invention, the support frame; At least one pair of support rollers installed on the support frame and rotating the pipes in a circumferential direction while supporting the outer circumferential surface of the pipe to be cut; A vertical strut installed in the vertical direction on the support frame; A horizontal arm provided in the horizontal direction so as to be lifted and lowered on the vertical shore; A torch fixing part installed at an end of the horizontal arm and having a plasma torch fixed thereto; And purge means for supplying an inert gas into the pipe at one end in the longitudinal direction of the pipe.

In addition, according to an embodiment of the present invention, the torch fixing part is rotatably installed in the radial direction of the pipe along the curvature of the outer circumference of the rotating pipe.

Further, according to an embodiment of the present invention, there is further provided at least a pair of sliding support means for slidingly supporting the pipe in its longitudinal direction while in contact with the outer peripheral surface of the pipe, the sliding support means in contact with the outer peripheral surface of the pipe It may be composed of a plurality of ball plunger (ball plunger) disposed in the site.

In addition, the at least one pair of support rollers and / or sliding support means may be configured to be movable in a direction away from or close to each other corresponding to the diameter of the pipe.

As described above, according to the present invention, when the pipe is cut by plasma, an inert gas can be supplied to the inside of the pipe to purge, thereby preventing the pipe dregs which are melted and scattered from being oxidized and fused to the inner surface of the pipe. Therefore, it is possible to provide a pipe cutting device in which the cutting residue can be easily removed with water washing or an air brush, and the shape of the cutting portion is clean.

In addition, the torch fixing unit is rotatably installed in the radial direction of the pipe along the curvature of the outer circumferential surface of the rotating pipe, so that the spacing of the plasma torch can be constantly maintained with respect to the non-circular pipe. Therefore, the shape of the cut surface and the cut position can be kept uniform.

Furthermore, according to the present invention, it is possible to cut pipes of various diameters from small diameters to large diameters with a single cutting device, and to reduce the size of the device compared to a conventional plasma cutting device, thereby improving mobility to a piping work site. have.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is a front view of a plasma pipe cutting device according to an embodiment of the present invention, a view from the radial direction of the pipe 10, Figure 2 is a side view of the pipe 10 in the longitudinal direction. 2, illustration of the purge means 170, the exhaust means 180, and the plasma torch 160 and the torch fixing heads 156 and 157 illustrated in FIG. 1 is omitted.

1 and 2, the plasma pipe cutting apparatus according to the present invention, the support frame 110, the vertical strut 120, the horizontal arm 125, the support roller (130L, 130R), the drive motor 140, a torch fixing unit 150, a plasma torch 160, a purge unit 170, an exhaust unit 180, a sliding support unit 190, and an operation panel 200.

The support frame 110 typically consists of a rectangular steel plate, which includes at least the vertical struts 120, the support rollers 130L and 130R, and the drive motor 140 and the torch fixture 150 mounted to the vertical struts 120. Material and structure are not particularly limited so long as they have the strength and structure sufficient to withstand the load of the pipe 10 placed on the control panel 200 and the support rollers 130L and 130R (sliding support in the drawing). Although the means 190L, 190R are shown to be installed on the support frame 110, the sliding support means 190L, 190R may be omitted or provided as a separate component from the support frame 110. To be described later). Also optionally, the lower portion of the support frame 110 may be attached to the wheel 111 to improve the mobility of the cutting device.

The vertical strut 120 is installed vertically on the support frame 110, and the horizontal arm 125 and the operation panel 200, on which the torch fixing part 150 is installed, are mounted at the end thereof. More specifically, the vertical strut 120 is composed of a pair of vertical struts 120 parallel to each other and a lifting shaft 121 in the form of a screw disposed therebetween. The operation panel 200 is attached to one vertical support 120, and the horizontal arm 125 is attached to the lifting shaft 121 so that the lifting handle 122 can be lifted up and down by rotation. In addition, the horizontal arm 125 is mounted to the lifting shaft so that the horizontal distance from the vertical support 120 to the torch fixing part 150 in FIG. 2 is adjustable.

On the other hand, although the lifting shaft 121 in the present embodiment is presented in the form of a screw, if the horizontal arm 125 can be mounted to the liftable lifting structure of the other lifting shaft and the horizontal arm (for example, chain or Of course, rack and pinion structures, linear motors, etc. may be employed.

The support rollers 130L and 130R are installed on the support frame 110 to support the pipe and rotate the pipe 10 while being in contact with the outer circumferential surface of the pipe 10. In this embodiment, the support rollers 130L and 130R are provided in two pairs, and in FIG. 2, the left support roller 130L and the right support roller 130R are connected by the roller rotation shaft 131 to rotate together. . In addition, the worm gear 142 is provided on the roller rotation shaft 131 of the left support roller 130L, and the worm gear 142 is engaged with the worm 141 connected to the rotation shaft of the driving motor 140, thereby driving the drive motor 140. The roller rotation shaft 131 of the left support roller 130L can rotate by the rotation of. That is, the left support roller 130L becomes a drive roller to rotate the pipe 10 by the frictional force, and the right support roller 130R becomes a driven roller that rotates in accordance with the rotation of the pipe 10.

The support rollers 130L and 130R may be made of any material and structure as long as they have a coefficient of friction sufficient to withstand the load of the pipe 10 and to rotate the pipe 10 in contact with the outer peripheral surface of the pipe 10. For example, if the pipe 10 is a steel pipe, the support rollers 130L and 130R are preferably made of metal, and the surface thereof is formed with fine grooves for enhancing friction with the pipe 10, or coated with rubber or resin. can do.

On the other hand, in the present embodiment, two pairs of support rollers 130L and 130R are provided, but the number of support rollers is not particularly limited. That is, the width of the support rollers (the horizontal lengths of the support rollers 130L and 130R in FIG. 1) may be widened to provide only one pair or three or more support rollers. In addition, the interval between the left and right support rollers 130L and 130R is preferably adjusted according to the diameter of the pipe 10, which will be described later.

The torch fixing part 150 is mounted at the end opposite to the lifting shaft 121 of the horizontal arm 125 described above. The torch fixing part 150 has a fixing part upper body 151U, a fixing part central body 151M, and a fixing part lower body 151L from above. The fixing unit upper body 151U is fixedly mounted to the end of the horizontal arm 125, and the through hole is formed up and down so that the swing shaft 152 is slidably penetrated. The torch fixing arm 155 is fixedly adjustable to the left and right lengths in FIG. In addition, the swing shaft 152 is fixedly or integrally formed on the upper portion of the fixed portion central body 151M, and is slidable through the through hole of the fixed portion upper body 151U through the coil spring 153. Is inserted. The fixing part lower body 151L is fixed to the lower part of the fixing part central body 151M, and the fixing part lower body 151L rotates in accordance with the rotation of the pipe while contacting the outer circumferential surface of the pipe 10. Is fitted.

Accordingly, the fixing part upper body 151U is fixed at the end of the horizontal arm 125 so that its height is kept constant, but as described above, when the pipe 10 is non-circular, the rocking roller 154 according to the rotation of the pipe. The upper and lower sides of the upper and lower sides of the fixing unit lower body 151L, the fixing unit central body 151M and the oscillation shaft 152 are allowed to swing up and down. As a result, the plasma torch 160 mounted to the fixing unit central body 151M through the torch fixing arm 155 may always maintain a constant distance from the outer circumferential surface of the pipe 10.

A torch fixing head 156 is mounted at an end opposite to the fixing unit central body 151M of the torch fixing arm 155, and a hole in which the plasma torch 160 is inserted is formed in the torch fixing head 156 to form a plasma torch. After the insertion of the 160, the torch fixing lever 157 can be used to fix the plasma torch 160. Here, the torch fixing head 156 is preferably mounted to the torch fixing arm 155 so as to adjust the angle of the plasma torch 160, that is, the angle formed by the plasma torch with the pipe 10.

Meanwhile, the torch fixing unit 150 may be equipped with the plasma torch 160, and the torch fixing unit 150 is not limited to the above-described concrete structure as long as the torch fixing unit 150 may swing up and down along the outer circumferential surface of the pipe 10. For example, in the above-described embodiment, the fixing unit central body 151M and the fixing unit lower body 151L may be integrally formed, and the number of the swing shaft 152 and the coil spring 153 or the swing roller 154 may be reduced. The number is not limited to the number shown in the drawings and can be changed.

The purge means 170 is disposed on the cut side of the pipe 10, that is, close to the plasma torch 160, and supplies an inert gas such as nitrogen or argon as a purge gas into the pipe 10. Specifically, the purge means 170 includes a purge gas cylinder and a flow control valve, although not shown, and includes a bearing at the center of the sealing cap 172 and the sealing cap 172 fitted to the cut end of the pipe 10. The purge gas is supplied into the pipe 10 through the purge gas supply pipe 171 which is rotatably connected through the pipe. Therefore, when cutting the plasma arc pipe 10, it is possible to prevent the pipe dregs which are melted and scattered from contacting with the oxygen in the air to be oxidized and to cool the pipe dregs to prevent the pipe dregs from being fused to the inner surface of the pipe 10. Thus, according to the present invention by providing the purge means 170 can maintain the inner surface shape of the pipe to be cut and can remove the source of contamination fundamentally.

Meanwhile, in the present embodiment, the purge gas supply pipe 171 and the sealing cap 172 are provided as specific means for supplying the purge gas, but the specific means is not limited thereto and may be changed. For example, the sealing cap 172 is effective to prevent air other than purge gas from entering the pipe 10 to be cut, but the sealing cap 172 may be prepared in various sizes according to the diameter of the pipe 10. This can be somewhat impractical in terms of cost versus effect as it must be replaced. Therefore, the desired effect can be obtained simply by implementing in the form of a nozzle injecting purge gas toward the cut point inside the pipe. In addition, in consideration of the fact that the length of the pipe 10 is variable, the purge means 170 is configured to be provided separately from the support frame 110 for miniaturization of the apparatus (ie, the support frame 110). The purge means 170 may be installed on the support frame 110.

The exhaust means 180 may be disposed on the opposite side to the purge means 170 of the pipe 10. The exhaust means 180 serves to suck and exhaust the inert gas supplied by the purge means 170 and the debris generated when the pipe 10 is cut, and includes an exhaust pump having an appropriate capacity. Exhaust means 180 may be specifically implemented as a purge means 170, the exhaust pipe 181 and the sealing cap 182, but similar to the purge means, the sealing cap 182 may be omitted and a pipe having an appropriate diameter pipe (10) It can also be implemented to be inserted into the configuration. In addition, the exhaust means 180 may be disposed on the support frame 110. Furthermore, when the pipe 10 is relatively small in diameter, the exhaust means 180 may be omitted when sufficient effect is obtained only by supplying the inert gas by the purge means 170.

Pipe cutting device of the present invention may be provided with at least a pair of sliding support means (190L, 190R) for slidingly supporting the pipe (10) in the longitudinal direction. These sliding support means 190L, 190R are particularly useful for loading / unloading large diameter heavy pipes in the cutting device or for moving the pipes longitudinally to adjust the cutting position.

The sliding support means 190L and 190R are each placed on the support frame 110 on the outside of the two pairs of support rollers 130L and 130R (the rightmost and leftmost side of the support frame 110 in FIG. 1). Pairs are provided. Each pair of sliding support means 190L, 190R is arranged in a V shape so as to be supported while contacting the outer circumferential surface of the pipe 10 on the left and right sides of the pipe 10 in FIG. 2. Preferably, the sliding support means 190L, 190R are implemented by placing a plurality of ball plungers 191 on the surface, which is a contact portion with the pipe 10. The ball plunger itself can slidably support the contact object in all directions, but since the sliding support means 190L and 190R are arranged in a V shape around the pipe 10 in this embodiment, the radial movement of the pipe Is regulated and only movable in the longitudinal direction.

In Figure 2 it is preferable that the sliding support means 190L, 190R arranged in pairs from side to side are movable in a direction away from or close to each other corresponding to the diameter of the pipe 10. To this end, each of the left and right sliding support means 190L and 190R is penetrated by the support means moving shaft 193 and installed in the support frame 110 as shown in FIG. 3. The supporting means moving shaft 193 has opposite directions of rotation of the threads formed on the portions corresponding to the left and right sliding support means 190L and 190R, and is supported by rotating the supporting means moving handle 192 in either direction. When the means moving shaft 193 is rotated, the left and right sliding support means 190L and 190R move in opposite directions to each other to move away from or close to each other. In addition, in FIG. 1, the pair of sliding support means 190L and 190R disposed on the left side and the pair of sliding support means 190L and 190R disposed on the right side may adjust their spacing independently. It is desirable that the spacing of the other pairs be adjusted in the same way. Although not shown, this may be implemented by interlocking the left and right pairs of the sliding support means 190L and 190R using a gear, a belt, a chain, and the like in the support frame.

On the other hand, the support rollers 130L and 130R described above are also arranged to be movable to move away from or close to each other in correspondence with the diameter of the pipe 10 like the sliding support means 190L and 190R, which is illustrated in FIG. 3. It may be implemented by a screw-shaped moving shaft and the roller moving handle 132 similar to the sliding support means 190L, 190R. However, in FIG. 2, since the support roller 130L on the left side is a driving roller that receives rotational force by the drive motor 140, its position is preferably fixed, and only the support roller 130R on the right side in FIG. 2 moves the roller. It is possible to implement by configuring to be movable by the handle 132. Furthermore, the sliding support means 190L and 190R may also be configured to fix the sliding support means 190L on the left side and to move only the sliding support means 190R on the right side. In addition, the distance adjusting means of the support rollers 130L and 130R and the sliding support means 190L and 190R may be embodied by other means known as racks and pinions, worms and worm gears or linear motors other than screws.

On the other hand, in the present embodiment, two pairs of sliding support means 190L and 190R are disposed one pair outside the support rollers 130L and 130R on the support frame 110, but the present invention is not limited thereto. For example, the sliding support means 190L and 190R may be disposed only on either side with the width (lateral length in FIG. 1) wider. In addition, although the sliding support means 190L and 190R are disposed on the support frame 110 in the present embodiment, they may be configured separately from the support frame 110. In this case, the pipe cutting device of the present invention can be further miniaturized.

The operation panel 200 is mounted on one vertical strut 120, and as shown in FIG. 2, the ON / OFF switch for operating the cutting device, the output of the plasma torch, and the rotational speed of the pipe 10 ( That is, an adjustment knob for adjusting the rotation speed of the driving motor 140 is provided. Also optionally, the operation panel 200 may be provided with a button for adjusting the flow rate control valve of the purge means 170, the pump output of the exhaust means 180, and the like. Meanwhile, in the drawing, the electrical connection required for controlling the driving motor 140, the plasma torch 160, the purge stage 170, and the exhaust means 180 in the operation panel 200 is omitted. In addition, in the present embodiment, the operation panel 200 is configured to be mounted on the vertical strut 120, but the arrangement thereof may be changed as much as possible, and may be configured separately from the pipe cutting device.

The pipe cutting device of the present invention can be miniaturized very compactly as described above. That is, in the case of a conventional plasma pipe cutting device, in particular, a computer numerical control (CNC) machine is usually implemented in a very long pipe length direction, two vertical struts, one at each end of the pipe longitudinal direction of the support frame, two It was common to set it as the structure which mounts a plasma torch fixing head between the long horizontal which connects two vertical struts horizontally. On the other hand, in the present invention, by installing only one vertical strut 120 at approximately the center of the support frame 110, the device can be configured very compactly. Each of the width, length, and height can be produced in about 1m, which can significantly improve the mobility to the plumbing site.

Hereinafter, the pipe cutting method according to the present invention will be described by explaining the operation of the pipe cutting device of the present invention.

First, the torch fixing part 150 is raised to rotate the lifting handle 122 so that the pipe 10 to be cut can be loaded into the cutting device. In addition, the gap between the left and right support rollers 130L and 130R is sufficiently widened by rotating the roller moving handle 132, and the pipe 10 may be configured to increase the gap between the left and right sliding support means 190L and 190R by rotating the supporting means moving handle 192. It is placed on it and adjusted so that the ball plunger 191 and the outer peripheral surface of the pipe contact.

Subsequently, the pipe 10 to be cut is placed on the sliding support means 190L and 190R. At this time, the space between the left and right support rollers 130L and 130R is sufficiently widened so that the pipe 10 and the support rollers 130L and 130R do not contact each other. In this state, the pipe 10 is pushed in the longitudinal direction to adjust the cutting position (position of the plasma torch 160), and then the roller moving handle 132 is turned to narrow the gap between the left and right support rollers 130L and 130R to support the support roller ( 130L and 130R are in contact with the outer circumferential surface of the pipe 10. Subsequently, the pipe 10 is supported only by the support rollers 130L and 130R by increasing the gap between the left and right sliding support means 190L and 190R by turning the support means moving handle 192. Subsequently, the lifting handle 122 is turned to lower the torch fixing unit 150 so that the rocking roller 154 of the torch fixing unit 150 contacts the upper surface of the pipe 10 at a suitable pressure.

Subsequently, the cap 172 to which the purge gas supply pipe 171 is connected and the cap 182 to which the exhaust pipe 181 is connected are fitted to both ends of the pipe 10. Then, by adjusting the button or the control knob of the operation panel 200, the output of the plasma torch 160, the rotational speed of the driving motor 140, the purge gas supply flow rate of the purge means 170, the exhaust means 180 Set the exhaust pump output. This completes the settings for cutting the pipe.

Subsequently, each switch of the operation panel 200 is operated to rotate the drive motor 140 at a predetermined speed to rotate the pipe 10, and generate a plasma arc to start cutting the pipe. At this time, an inert gas is supplied from one end of the pipe 10 to the inside of the pipe by the purge means 170 to prevent oxidation of the pipe dregs which are melted and scattered by the plasma arc, and the dregs are fused to the inner surface of the pipe. prevent.

When the pipe 10 is rounded in the circumferential direction and the cutting of the pipe is completed, the operation of the driving motor 140, the plasma torch 160, the purge means 170, and the exhaust means 180 is stopped. ), The torch fixing part 150, the sliding support means 190L and 190R, and the support rollers 130L and 130R are moved and the unloaded cut pipe is unloaded. This is then removed by brushing off or rinsing off the cutting by-products remaining on the inner surface of the pipe.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be appreciated that one embodiment is possible. Accordingly, the true scope of the present invention should be determined by the technical idea of the claims.

1 is a front view of a plasma pipe cutting apparatus according to an embodiment of the present invention.

2 is a side view of the apparatus shown in FIG. 1.

3 is a view for explaining a specific configuration of the sliding support means in the apparatus shown in FIG.

<Description of the symbols for the main parts of the drawings>

10 pipe 110: support frame

111: moving wheel 120: vertical strut

121: lifting shaft (screw) 122: lifting handle

125: horizontal arm 130L, 130R: support roller

131: roller rotation axis 132: roller moving handle

140: drive motor 141: worm

142: worm gear 150: torch fixing part

151U: Fixed part upper body 151M: Fixed part central body

151L: fixed lower part body 152: swing shaft

153: coil spring 154: rocking roller

155: torch fixing arm 156: torch fixing head

157: torch fixing lever 160: plasma torch

170: purge means 171: purge gas supply pipe

172: airtight cover 180: exhaust means

181: exhaust pipe 182: airtight cover

190L, 190R: Sliding support means 191: Ball plunger

192: support means moving handle 193: support means moving shaft (screw)

200: operation panel

Claims (9)

Support frame; At least one pair of support rollers installed on the support frame and rotating the pipes in a circumferential direction while supporting the outer circumferential surface of the pipe to be cut; A vertical strut installed in the vertical direction on the support frame; A horizontal arm provided in the horizontal direction so as to be lifted and lowered on the vertical shore; A torch fixing part installed at an end of the horizontal arm and having a plasma torch fixed thereto; And And a purge means for supplying an inert gas into the pipe at one end of the pipe in the longitudinal direction. The method of claim 1, And exhaust means for sucking and exhausting the inert gas supplied by the purge means at the other end in the longitudinal direction of the pipe and the debris generated during the cutting of the pipe. The method according to claim 1 or 2, The torch fixing unit is a plasma pipe cutting device, characterized in that is installed to be able to swing in the radial direction of the pipe along the curvature of the outer peripheral surface of the rotating pipe. The method according to claim 1 or 2, And said at least one pair of support rollers are movable in a direction away from or near each other corresponding to the diameter of said pipe. The method according to claim 1 or 2, And at least one pair of sliding support means for slidingly supporting the pipe in the longitudinal direction while being in contact with the outer circumferential surface of the pipe. The method of claim 5, And said at least one pair of sliding support means comprises a plurality of ball plungers disposed in contact with an outer circumferential surface of said pipe. The method of claim 5, And said at least one pair of sliding support means is movable in a direction away from or in proximity to each other corresponding to the diameter of said pipe. In the method of cutting into a plasma arc while rotating the pipe, Pipe cutting method, characterized in that for cutting the pipe while supplying an inert gas into the pipe at one end of the longitudinal direction of the pipe, preventing the pipe debris melted and scattered by the plasma arc oxidized and fused to the inner surface of the pipe. . The method of claim 8, The inert gas is supplied into the pipe at one end of the pipe in the longitudinal direction, and the inert gas and the pipe dregs are sucked and exhausted at the other end of the pipe.

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