KR20120013046A - Pipe Cutting Method and Cutting Apparatus - Google Patents

Abstract

PURPOSE: A pipe cutting apparatus for a tube mill and a method thereof are provided to cut various lengths of pipes by adjusting a stopper. CONSTITUTION: A pipe cutting apparatus for a tube mill(100) comprises a roller conveyer(110), a stopper member(120), a clamping member(150), and a cutting member(170). The roller conveyer has multiple transferring rollers(112) and let a predetermined pipe move forth and back in a longitudinal direction. When the pipe moves forth, the stopper member is raised to pass through the pipe and when the pipe moves back the stopper member is descends to seclude the pipe. When the pipe moves forth and back, the stopper member passes through the pipe and if the pipe is fixed by the clamping member, the cutting member cuts the pipe using a bite(171) rotating along the exterior peripheral of the pipe.

Description

Pipe cutting device for pipe line and its method {Pipe Cutting Method and Cutting Apparatus}

The present invention relates to a pipe cutting device, and more particularly, to a pipe cutting device and a method for a pipe pipe line for applying to a pipe pipe production line for producing a pipe by rolling a steel sheet in the form of a tube.

In general, there is a method of manufacturing a steel tube (steel tube), there is a production method by the injection method and a method of processing the steel sheet into a tube, the injection method is a manufacturing method using a steel sheet because of the high manufacturing cost.

In the latter method, the steel pipe manufacturing method continuously draws a roll-shaped steel sheet during pipe making and forms a circular shape such that both ends contact the upper portion by several rollers, and then welds the joint by electric resistance welding. The pipe is finished and cut to a certain length according to the user's requirements or needs.

Thus, such a tube production line is provided with a pipe cutting device for cutting a pipe continuously produced in the longitudinal direction to a certain length. In particular, the tube production line is provided with a traveling pipe cutting device for cutting the pipe continuously produced while moving back and forth along the longitudinal direction of the pipe. Such a traveling pipe cutting device has a merit that continuous cutting of the pipe is possible because the cutting device is provided on a bogie that moves horizontally in the longitudinal direction corresponding to the moving speed of the pipe, but the structure of the device is complicated and expensive. have.

As shown in FIG. 10, a pipe cut by the traveling pipe cutting device has a problem that one end of the pipe is vertically processed but the other end of the pipe is not vertically processed. In the tube production line, the cut pipe is provided with a pipe cutting device at the rear end of the tube production line because the length of the pipe is changed again during the calibration process for correcting the diameter of the pipe to the desired size.

The present invention relates to a pipe cutting device for application to the rear end of the tube production line.

As a pipe cutting device that can be applied to a tube production line, Korean Utility Model Publication No. 1999-12925 discloses a 'pipe cutting device'. As shown, the shelf for cutting the pipe is indicated by reference numeral 10. A stopper 11 is mounted on the inside of the shelf 10 so as to detect the transferred pipe P and send the signal to the chuck so that chucking is performed, and on one side thereof, a pipe transfer means for transferring the pipe P. 20 is mounted. And the upper side of the pipe (P) is provided with a plurality of pipe guide means 40 for supporting the pipe (P) rotated during cutting.

In the conventional pipe cutting device configured as described above, the pipe P is transferred to the shelf 10 according to the operation of the pipe conveying means 20, which is caused by the rotating operation of the conveying roller rotated according to the operation of the drive motor. When the pipe P is transported and the pipe P is transported and the tip contacts the stopper 11, the signal is transmitted to the chuck of the shelf 10 so that the chuck chucks the tip of the pipe P. In addition, when the rotation operation is performed in the state in which the pipe P is chucked, the tool post of the shelf 10 is advanced to contact the pipe P in which the bite is rotated, thereby cutting.

However, the pipe cutting device of the related art has a problem in that noise and vibration are generated when the pipe is cut because the pipe P is rotated and cut. In addition, the conventional pipe cutting device is not equipped with a function for automatically setting the cut length of the pipe. In other words, the pipes produced in the tube production line have different lengths of pipes during the straightening process, so when cutting the same point, for example, a certain distance from the tip of the pipe, the cut pipes have different lengths. do. Therefore, in order to make the length of the cut pipe uniform, a means for automatically setting the cut length of the pipe must be provided. However, the conventional pipe cutting device has a problem in that the length of the cut pipe is not uniform because the stopper 11 is installed at the tip of the pipe and is spaced a certain distance behind the shelf 10 to be installed. In addition, the conventional pipe cutting device has a problem that the structure of the device is complicated because the shelf or bite must be moved from side to side to automatically set the cutting length of the pipe.

The present invention is to solve the problems of the prior art, the main object of the present invention is to cut the pipe using a bite that rotates along the outer peripheral surface of the pipe, the cutting length of the pipe through the stopper for supporting the rear end of the pipe It is to provide a pipe cutting device and a pipe cutting method using the same to cut the pipe continuously produced in the tube production line to a predetermined length by setting the automatic.

The present invention also installs a roller conveyor for transporting the pipe in the longitudinal direction of the pipe, and by moving the pipe back and forth through the roller conveyor not only can simplify the structure of the pipe cutting device to save installation space, but also in the pipe production line It is to provide a pipe cutting device and a pipe cutting method using the same that can continuously cut the pipe produced continuously.

In addition, the present invention can automatically discharge the remaining residue after cutting the pipe, pipe cutting apparatus that can improve the quality of the product by vertically processing both ends of the pipe produced through the tube production line and pipe cutting using the same To provide a way.

As a means for achieving the above object, a pipe cutting device for a pipe pipe line according to the present invention, in the pipe cutting device connected to the conveyor of the pipe pipe production line,

A roller conveyor of a predetermined length consisting of a plurality of conveying rollers for advancing and retracting a pipe of a predetermined length in a longitudinal direction;

A stopper member installed at a rear end of the roller conveyor and configured to ascend when the pipe moves forward to pass the pipe, and to descend and block when the pipe moves backward;

A clamp member installed at the tip of the roller conveyor, the clamp member rising when the pipe moves and passing through the pipe and fixing the pipe when the pipe is blocked by the stopper member;

A cutting member which is installed in front of the clamp member and passes through when the pipe moves forward or backward and cuts the pipe using a bite that rotates along the outer circumferential surface of the pipe when the pipe is fixed by the clamp member. Wow;

And a discharge member for discharging the pipe cut by the cutting member to the side of the roller conveyor.

In addition, the pipe cutting method according to the present invention, in the pipe cutting method for cutting a pipe produced in a tube production line to a predetermined length,

A loading step of transferring a pipe of a predetermined length produced in a tube production line and vertically processed to a roller conveyor;

A forward conveyance step of conveying the pipe forward along the roller conveyor such that a rear end of the pipe passes through the stopper member;

A backward conveyance step of operating the roller conveyor in an opposite direction to convey the pipe backward until the rear end of the pipe is blocked by the stopper member;

A fixing step of fixing the pipe by using a clamp member while a rear end of the pipe is blocked by the stopper member;

Cutting the pipe by using a bite that rotates along an outer circumferential surface of the pipe fixed by the clamp member;

A second forward transfer step of removing the residue of the pipe cut in the cutting step by transferring the pipe to the front;

A second rearward conveyance step of conveying the pipe backwards such that the tip of the pipe passes through the clamp member;

And a pipe discharging step of discharging the pipe passing through the clamp member to the side of the roller conveyor.

Pipe cutting device for a pipe production line according to the present invention, there is an effect that can be automatically cut pipes continuously produced by connecting directly to the pipe production line.

In addition, the pipe cutting device of the present invention not only has a simple structure, but also can cut the length of the pipe uniformly by using a stopper installed at the rear end of the pipe, and also cut the pipe of various lengths by adjusting the position of the stopper. It has an effect.

In addition, the present invention in the tube production line, the rear end of the pipe is vertically cut at the same time the vertical processing of the pipe at the same time by cutting the length of the pipe uniformly and at the same time both sides of the pipe to be vertically processed to improve the quality of the product There is an effect to be improved.

In addition, the present invention has the effect of improving the work efficiency by automatically discharging pipe residues as well as automatically supply and discharge pipes.

1 is a block diagram showing a schematic structure of a pipe cutting device according to the present invention,
2 is a schematic diagram showing the structure of a pipe cutting device according to the present invention;
Figure 3 is a side view showing the structure of the roller conveyor of the pipe cutting device according to the present invention,
Figure 4 is a side view showing the structure of the stopper member of the pipe cutting device according to the present invention,
5 is a cross-sectional view showing the structure of a clamp member of a pipe cutting device according to the present invention;
6 is a cross-sectional view showing the structure of a pipe cutting member of the pipe cutting device according to the present invention;
Figure 7 is a side view showing the structure of the pipe discharge member of the pipe cutting device according to the present invention,
8 is a flowchart showing a pipe cutting method according to the present invention;
9a to 9h are explanatory views showing a pipe cutting method according to the present invention;
10 is a schematic cross-sectional view showing an example of a pipe produced in the tube production line.

Hereinafter, a pipe cutting device for a pipe line according to the present invention and a method thereof will be described with reference to the accompanying drawings.

First, as shown in Figure 1, the pipe cutting device for pipe line (hereinafter referred to as 'pipe cutting device') 100 of the present invention, the roller conveyor 110 of a predetermined length consisting of a plurality of feed rollers 112 large. ), A stopper member 120 provided at the rear end of the roller conveyor 110, a clamp member 150 provided at the front end of the roller conveyor 110 and separated from the stopper member 120 by a predetermined distance, and the clamp. It is composed of a cutting member 170 provided in close proximity to the front of the member 150, and a pipe discharge member 190 provided below the roller conveyor 110.

2 and 3, the roller conveyor 110 includes a plurality of transfer rollers 112 installed at a predetermined height from the bottom. The feed roller 112 may advance or retract the pipe P in the longitudinal direction according to the rotational direction. The plurality of feed rollers 112 are rotatably installed on the frame 111 of a predetermined height. And the transfer roller 112 is connected to the drive motor 116 through a power transmission means 114, such as a chain or belt. Accordingly, as the driving motor 116 rotates, the plurality of feed rollers 112 rotates to advance or reverse the pipe P.

2 and 4, the stopper member 120 includes a stopper 122 installed to be moved up and down on an upper portion of the rear end of the roller conveyor 110. The stopper 122 is installed to vertically move up and down by the first hydraulic cylinder 124. For example, the mall stopper 122 may rise to allow the pipe P to move along the transfer roller 112 to pass therethrough. On the contrary, when the stopper 122 descends, the pipe P moving along the transfer roller 112 may be blocked. The first hydraulic cylinder 124 is fixed by the first support 126. The first support 126 is detachably installed to the frame 111. Therefore, the stopper member 120 may change the installation position of the first support 126 according to the length of the pipe (P) to be cut. The stopper member 120 raises the stopper 122 when the pipe P moves forward to allow the pipe to pass therethrough, and lowers the stopper 122 when the pipe P moves backward. Block the trailing end of (P).

As such, the present invention may determine the cutting length of the pipe P by installing the stopper 122 at the rear end of the roller conveyor 110 and blocking the pipe moving backward. That is, since the length of the pipe supplied from the pipe line is changed during the calibration process, the length of the pipe may be always uniformly cut by cutting the point spaced forward by a predetermined distance from the rear end of the pipe P. In addition, since the rear end of the pipe is vertically processed in the pipe produced in the conventional pipe line, both ends of the pipe can be vertically processed by vertical processing when cutting the front end of the pipe.

In addition, the length of the pipe P to be cut may be adjusted by changing the position of the stopper 122 in the longitudinal direction of the roller conveyor 110. For example, the length of the pipe P becomes longer as the stopper member 120 moves to the rear end of the roller conveyor 100, and conversely, the stopper member 120 moves toward the front end of the roller conveyor 110. The length of the pipe P is shortened.

Next, referring to FIGS. 2 and 5, the clamp member 150 includes an upper clamp 154 fixed to the front end of the roller conveyor 110 and a lower clamp 152 installed to correspond to the upper clamp 154. It consists of. The lower clamp 152 is installed to support the pipe (P) transported along the roller conveyor 110, the upper clamp 154 is installed so as to be movable up and down (pipe on the lower clamp 152 ( It is installed to fix P). The upper clamp 154 is installed to be movable up and down by a second hydraulic cylinder 156 installed on the roller conveyor 110. In addition, the second hydraulic cylinder 156 is fixed by a second support 158 vertically installed on the upper portion of the roller conveyor 110. The second support 158 is fixed to the frame 111. In addition, the lower surface of the upper clamp 154 and the upper surface of the lower clamp 152 is formed with grooves corresponding to the outer shape of the pipe and having a diameter slightly smaller than the diameter of the pipe. Therefore, when the pipe P moves forward or backward, the upper clamp 154 rises and passes as it is, and when the pipe is blocked by the stopper 122, the upper clamp 154 descends to lower the pipe P. Is firmly fixed between the lower clamp 152 and the upper clamp 154.

2 and 6, the cutting member 170 is installed in front of the clamp member 150 at a predetermined distance, and the hollow spindle 172 into which the front end of the pipe P is inserted. And a byte 171 rotating around the pipe P. That is, the cutting member 170 is connected to the pulley 174 integrally formed on the spindle 172 and the pulley 174 through a belt 175 to drive the second drive motor for rotating the spindle 173. 176, including. At this time, the spindle 172 is rotatably installed in the housing 177 of a predetermined height. And the flange 182 is integrally formed on the other side of the hollow spindle 172. In addition, a tool flange 186 is connected to the flange 182 through a plurality of guide bars 184, and a bite 171 is installed to the tool flange 186 to be moved up and down through a bite holder 173. do. A wheel slide 188 is installed between the tool flange 186 and the flange 182 to move left and right along the guide bar 184. At this time, the guide groove 185 having a predetermined inclination angle is formed on the outer circumferential surface of the wheel slide 188. In addition, the guide groove 185 is rotatably installed with a guide rod 189 connected to the bite 171 through a tool holder 178. A third hydraulic cylinder 179 is installed at a lower portion of the spindle 172 to move the wheel slide 188 back and forth. The third hydraulic cylinder 179 is connected to a wheel slide 188 that rotates through a predetermined arm 183.

Therefore, when power is applied to the second drive motor 176 through a controller (not shown), the flange 182 and the wheel slide 188 connected to the spindle 172 by the operation of the second drive motor 176. And tool flange 186 is rotated. Then, the bite 171 installed on the tool flange 186 also rotates together. Then, when the third hydraulic cylinder 179 is operated, the arm 183 pushes the rotating wheel slide 188 to the left. When the wheel slide 188 moves to the left, the wheel slide 188 is moved. The guide rod 198 rotating along the inclined surface of the e) advances the bite 171 in the axial center direction, thereby cutting by the bite 171. On the contrary, when the cutting operation is completed, the bite 171 is retracted and the second driving motor 176 is stopped due to the return operation of the third hydraulic cylinder 179. As such, the cutting member 170 cuts the pipe P using the bite 171 rotating along the outer circumferential surface of the pipe P, and the residue S of the pipe cut by the bite 171. ) Remains inside the hollow spindle 173.

In the present specification, detailed structures of the guide rods 198 and the arms 183 have not been described in detail. However, since the structure of the guide rod 198 and the arm 183 for achieving this function is to the extent that can be variously selected in the art, any one can be applied to suit the purpose of the present invention. In addition, the front of the cutting member 170 is further provided with a residue storage box for storing the pipe residues (S) discharged from the spindle (173).

Next, referring to FIGS. 2 and 7, the pipe discharge member 190 is composed of a plurality of discharge zones 191 provided between the plurality of transfer rollers 112. And the pipe discharge member 190 is connected to the end of the discharge table 191 and a plurality of rotating table (194) installed to rotate about the rotation axis 193 and the end of the plurality of rotating table (194) The crossbar 195 is connected, and the fourth hydraulic cylinder 197 is installed to be connected to the crossbar 195. At this time, the discharge table 191 is installed in the lower portion of the transfer roller 112 to allow the pipe (P) to move freely back and forth.

Therefore, when the fourth hydraulic cylinder 197 is operated to rotate the plurality of discharge tables 191 to incline upward of the transfer roller 112, the pipe P on the transfer roll 112 is discharged. Along the inclined surface of 191 is discharged to the side of the roller conveyor (110). At this time, a side of the roller conveyor 110 is further provided with a pipe loading device 199 (not shown) for loading the pipe discharged by the pipe discharge member 190.

On the other hand, the pipe production line in which the pipe cutting device 100 according to the present invention is installed is largely composed of an uncoiling part, a pipe part, a heat treatment part, a traveling cutter, and a straightening part. In addition, the tube part is composed of a forming part, a welding part, a polishing part, a cooling part, a bead rolling part, and the like. The uncoiling part is supplied by unwinding the steel sheet wound in the form of a coil. The forming unit is piped in the form of a tube (TUBE) using a steel sheet supplied in a flat state. The weld forms a pipe by welding the seam of the pipe. The polishing portion polishes the welding portion. The cooling unit is cooled to an appropriate temperature because the temperature of the tube after forming, welding and polishing process is very high. The bead rolling portion smoothly cuts the bead portion of the tube, that is, the welded portion. Subsequently, the heat treatment unit is heat treated to improve the mechanical properties of the tube. The traveling cutter cuts the pipe to a suitable length. The calibration unit reduces the diameter of the tube according to the diameter standard of the tube to be finally produced. Since the pipe produced through this tube production line changes the length of the pipe during the straightening, the final cutting member must be separately provided at the rear end of the tube production line.

Pipe cutting device 100 according to the present invention is to cut the pipe (P) continuously produced in such a tube production line to any length. In particular, the cutting surface of the pipe (P) produced in the tube production line as shown in Figure 8, the rear end of the pipe (P) is processed vertically, but the front end of the pipe (P) is not processed vertically. Therefore, the pipe cutting device 100 of the present invention is to cut the pipe to a certain length by cutting a predetermined length (d) from the tip of the pipe (P) and at the same time to vertically process the tip of the pipe.

Hereinafter, a pipe cutting method according to the present invention will be described.

As described above, the pipe continuously produced in the tube production line is the rear end is processed vertically, so the pipe cutting method of the present invention is to cut the end of the pipe to a predetermined length, as shown in Figure 8, A loading step (S10) for largely transferring the pipe to a roller conveyor, a first forward transfer step (S20) for transferring the pipe forward along the roller conveyor to allow the rear end of the pipe to pass through the stopper member, and the A first backward conveyance step (S30) in which the rear end of the pipe is blocked by the stopper member by moving the pipe backward by operating a roller conveyor in the opposite direction, and the rear end of the pipe is blocked by the stopper member. Fixing step (S40) for clamping the pipe in the clamp member, and the pie fixed by the clamp member Cutting step (S50) for cutting the front end of the frame, the second forward transfer step (S60) for discharging the residue cut by moving the pipe cut in the cutting step forward, and the pipe cut in the cutting step in the rear And a second rear conveying step (S70) through which the front end passes through the clamp member, and a pipe discharging step (S80) for discharging the pipe conveyed backward to the side of the roller conveyor. And by repeating this process, it is possible to continuously and uniformly cut the pipe produced in the tube production line.

First, referring to Figure 9a, the loading step (S10) is a step of supplying the pipe cutting device 100 by mounting a pipe (P) of a predetermined length produced in the tube production line to the roller conveyor 110 to be. At this time, as shown in Figure 10, the pipe (P) is cut to a certain length by a cutting machine of the tube production line, the rear end is processed vertically, but the front end is not processed vertically.

Subsequently, referring to FIG. 9B, the front transfer step S20 is a step of transferring the pipe P forward along the roller conveyor 110. This forward transfer step S20 proceeds until the rear end of the pipe P passes completely through the stopper member 120. To this end, both the stopper 122 of the stopper member 120 and the upper clamp 154 of the clamp member 150 maintain the raised state.

And, referring to Figure 9c, the first rear conveying step (S30) is a step for transferring the pipe (P) to the rear by operating the roller conveyor 110 in the opposite direction. At this time, the stopper member 120 lowers the stopper 122 to block the rear end of the pipe (P). The rear conveyance step S30 proceeds until the rear end of the pipe P is blocked by the stopper 122.

Next, referring to FIG. 9D, the fixing step S40 is a step of fixing the pipe P by using the clamp member 150. That is, the upper clamp 154 of the clamp member 150 is lowered while the rear end of the pipe P is blocked by the stopper 122 to lower the pipe P to the upper clamp 154 and the lower clamp. Secure between 152. At this time, the transfer roller 112 of the roller conveyor 110 is stopped rotation.

Subsequently, referring to FIG. 9E, the cutting step S50 may be performed by using the bite 171 that rotates along the outer circumferential surface of the pipe P fixed by the clamp member 150. Cutting step. At this time, the pipe (P) fixed by the clamp member 150 is the front end is located in the hollow of the spindle 172. Accordingly, the bite 171 is rotated along with the spindle 172 to move forward in the axial center direction and the cutting is performed. When the cutting operation is completed, the rotation of the spindle 172 is stopped and the cut residue S remains in the hollow of the spin mold 172.

Subsequently, referring to FIG. 9F, the second forward transfer step S60 moves the pipe P cut in the cutting step S50 to the front again to leave the residue S remaining in the hollow of the spindle 172. ) To the outside. This step is a step for discharging the residue, and is made in a similar manner to the first forward transfer step S20, but time control is possible to move only a relatively short distance.

And, referring to Figure 9g, the second back transfer step (S70) is a step of transferring the cut pipe (P) back to the back, the front end of the pipe (P) completely escapes the clamp member 150 Proceed until.

Finally, referring to FIG. 9H, the pipe discharging step S80 is a step of discharging the pipe P transported backward to the side of the roller conveyor 110. The pipe discharging step (S80) is made by inclining a plurality of discharge tables 191 installed between the transfer rollers 112 using a third cylinder 197 at an angle. Therefore, the pipe P on the discharge table 191 inclined at an angle is separated from the side of the roller conveyor 110 and loaded into the pipe stacking box.

As described above, the pipe cutting method according to the present invention, after the pipe is continuously transported back in the pipe production line back to the stop using a stopper and separated by a predetermined distance from the clamp member in a fixed state using the clamp member By cutting the pipe using the bite installed at the designated position, it is possible not only to cut to a certain length at all times but also to simplify the structure of the device, to save space, and to cut the pipe of various lengths according to the position of the stopper. Can be.

In addition, the pipe cutting method according to the present invention uses a stopper, a clamp, and a cutting member installed in the roller conveyor, so that the length of the pipe can be cut constantly without using a complicated sensor, and the loading and discharging of the pipe can be automated. Easy to do In addition, the pipe cutting method according to the present invention can automatically discharge the residue remaining on the cutting member by transporting the pipe a predetermined distance forward.

As described above, the present specification has been described in detail with reference to the preferred embodiment of the pipe cutting device applied to the tube production line, but the pipe cutting device of the present invention is a pipe produced by other methods as well as pipes produced in the tube production line. Since it is easy for those skilled in the art to apply to the cutting will also fall within the scope of the present invention.

100: pipe cutting device 110: roller conveyor
111: frame 112: feed roller
114: power transmission means 116: drive motor
120: stopper member 122: stopper
124: first hydraulic cylinder 126: first support
150: clamp member 152: lower clamp
154: upper clamp 156: second hydraulic cylinder
158: second support 170: cutting member
171: Byte 172: Spindle
174: pulley 175: belt
176: second drive motor 177: housing
178: tool holder 179: third hydraulic cylinder
182: flange 183: arm
184: guide bar 185: guide groove
186: tool flange 188: wheel slide
189: guide rod

Claims (7)

In the pipe cutting device connected to the conveyor of the tube production line,
A roller conveyor of a predetermined length consisting of a plurality of conveying rollers for advancing and retracting a pipe of a predetermined length in a longitudinal direction;
A stopper member installed at a rear end of the roller conveyor and configured to ascend when the pipe moves forward to pass the pipe, and to descend and block when the pipe moves backward;
A clamp member installed at the tip of the roller conveyor, the clamp member rising when the pipe moves and passing through the pipe and fixing the pipe when the pipe is blocked by the stopper member;
A cutting member which is installed in front of the clamp member and passes through when the pipe moves forward or backward and cuts the pipe using a bite that rotates along the outer circumferential surface of the pipe when the pipe is fixed by the clamp member. Pipe cutting device, characterized in that configured to include. The method of claim 1,
The pipe cutting device further comprises a pipe discharging member for discharging the pipe cut by the cutting member to the side of the roller conveyor. The method of claim 2,
The roller conveyor includes a plurality of transfer rollers installed at a predetermined height from a bottom, power transmission means installed to transfer power to the transfer roller, and a drive motor connected to the power transmission means;
The stopper member includes a stopper installed on an upper portion of the roller conveyor to block the pipe, a first hydraulic cylinder for vertically moving the stopper up and down, and a first support for fixing the first hydraulic cylinder. ;
The clamp member includes an upper clamp installed at an upper portion of the roller conveyor to fix the pipe, a lower clamp installed at a lower portion of the roller conveyor so as to correspond to the upper clamp, and a second hydraulic cylinder for vertically moving the upper clamp up and down. And, Pipe cutting device comprising a second support for supporting the second hydraulic cylinder. The method of claim 3,
The cutting member is installed in front of the clamp member spaced apart a predetermined distance, the hollow spindle is inserted into the front end of the pipe, the pulley integrally formed on the spindle, connected to the pulley through a belt to rotate the spindle A second drive motor to be provided, a flange installed on the other side of the spindle, a tool flange connected to the flange through a plurality of guide bars, a bite installed on the tool flange to rotate along an outer circumferential surface of the pipe, and the tool A wheel slide movably left and right along a guide bar provided between the flange and the flange, a guide rod for pressing the bite in the axial direction while moving along a guide groove formed on an outer circumferential surface of the wheel slide, and the wheel slide Including a third hydraulic cylinder installed to move from side to side Pipe cutting apparatus according to claim generated. The method of claim 3,
The pipe discharge member may include a plurality of discharge tables provided between a plurality of transfer rollers, a plurality of pivot tables connected to an end of the discharge table and pivoted about a rotation axis, a crossbar connected to the ends of the plurality of pivot tables, And a fourth hydraulic cylinder installed to be connected to the crosspiece. In the pipe cutting method for cutting the pipe produced in the tube production line to a certain length,
A loading step of transferring a pipe of a predetermined length produced in the tube production line and vertically processed to a roller conveyor;
A forward conveyance step of conveying the pipe forward along the roller conveyor such that a rear end of the pipe passes through the stopper member;
A backward conveyance step of operating the roller conveyor in an opposite direction to convey the pipe backward until the rear end of the pipe is blocked by the stopper member;
A fixing step of fixing the pipe by using a clamp member while a rear end of the pipe is blocked by the stopper member;
Cutting the pipe by using a bite that rotates along an outer circumferential surface of the pipe fixed by the clamp member;
A second forward transfer step of removing the residue of the pipe cut in the cutting step by transferring the pipe to the front;
And a second backfeeding step of transferring the pipe backwards to allow the tip of the pipe to pass through the clamp member. The method of claim 6,
And a pipe discharging step of discharging the pipe passing through the clamp member to the side of the roller conveyor.

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