JP2010075959A - Coolant feeding head for thermal cutting processing and pipe cooling apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coolant feeding head for thermal cutting processing capable of efficiently cooling processing spots and sufficiently suppressing bad effects due to heat during processing. <P>SOLUTION: The coolant feeding head 100 for thermal cutting processing is inserted into a pipe and supplies a coolant to the inside of the pipe when cutting the pipe by irradiating a thermal cutting beam from the outside toward the circumferential wall of the pipe W from a thermal cutting processing head 12. The coolant feeding head 100 includes: a head body 100A having a cross-sectional shape corresponding to the inner circumference shape of the pipe; the injection nozzle 120 of the coolant arranged at the outer circumferential part of the head body; an inner passage 110 formed at the inside of the head body and feeding the coolant to each injection nozzle; and a rotary joint formed at the entrance of the inner passage and rotatably connecting the head body with an outer coolant feeding pipe. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  In the present invention, when cutting a pipe by irradiating a thermal cutting beam (mainly a laser beam) from the outside toward the peripheral wall of the pipe from the thermal cutting head, the cooling medium is inserted into the pipe and inserted into the pipe. The present invention relates to a cooling medium supply head and a pipe cooling device for supplying thermal cutting.

  There is known a thermal cutting apparatus that cuts a metal pipe by irradiating a thermal cutting beam (mainly a laser beam) from the outside toward the peripheral wall of the pipe from the thermal cutting head. In this type of thermal cutting apparatus, heat is generated during the cutting process of the pipe, and if the influence of this heat is large, the processing accuracy decreases due to thermal expansion.

Therefore, it has been proposed to cool the pipe by injecting a cooling medium (such as a gas containing dry ice particles) into the pipe from the end of the pipe to reduce the influence of heat (for example, Patent Document 1).
Japanese Patent Laid-Open No. 2006-326615

  However, in the method of injecting the cooling medium from the end of the pipe to the inside of the pipe, when the processing point is away from the end of injecting the cooling medium, the cooling effect may be difficult to reach the processing point, and the adverse effect due to heat. May not be sufficiently suppressed.

  In consideration of the above circumstances, the present invention is capable of efficiently cooling a processing portion and sufficiently suppressing adverse effects due to heat during processing, and a cooling medium supply head for thermal cutting processing, and its cooling medium An object of the present invention is to provide a pipe cooling device having a supply head as a main part.

  The cooling medium supply head for thermal cutting according to the invention of claim 1 is inserted into the pipe when the thermal cutting beam is irradiated from the outside toward the peripheral wall of the pipe from the thermal cutting head to cut the pipe. A cooling medium supply head for thermal cutting processing for supplying a cooling medium to the inside of the pipe, the head main body having a cross-sectional shape corresponding to the inner peripheral shape of the pipe, and provided on the outer peripheral portion of the head main body The cooling medium spray nozzle, an internal passage formed in the head main body for supplying the cooling medium to the spray nozzles, and provided at an inlet of the internal passage, with respect to an external cooling medium supply pipe And a rotary joint that rotatably connects the head main body.

  The invention according to claim 2 is the cooling medium supply head for thermal cutting according to claim 1, wherein the head body has a guide member for reducing sliding resistance of the head body against the inner wall of the pipe. It is provided.

  A third aspect of the present invention is the cooling medium supply head for thermal cutting according to the second aspect, wherein a plurality of rollers that roll in contact with the inner wall of the pipe are provided as the guide member. It is characterized by.

  According to a fourth aspect of the present invention, there is provided a cooling medium supply head for thermal cutting processing according to the second aspect, wherein the guide member is a brush that floats the head body from the inner wall of the pipe by contacting the inner wall of the pipe. It is provided.

  Invention of Claim 5 is the cooling-medium supply head for thermal cutting of any one of Claims 1-4, Comprising: The said head main body comprises the square shape which can be inserted in the inside of a square pipe, and It has a substantially X-shaped cross section having a recess in a portion corresponding to four sides of the square pipe.

  A sixth aspect of the present invention is the cooling medium supply head for thermal cutting according to any one of the first to fifth aspects, wherein a rotary joint connected to the external cooling medium supply pipe is the head main body. It is arrange | positioned at the rear end and the said injection nozzle is provided with an angle so that the said cooling medium may be injected diagonally back.

  A seventh aspect of the invention is the cooling medium supply head for thermal cutting according to any one of the first to sixth aspects, wherein the injection nozzle injects a mixed mist of air and water as the cooling medium. It is characterized by doing.

  Invention of Claim 8 is a cooling medium supply head of any one of Claims 1-6, Comprising: The said head main body is comprised with the porous carbon material which has innumerable mesh-shaped path | routes, The cooling medium supplied to the internal passage can be oozed out to the outer surface through the infinite number of mesh paths.

  A pipe cooling device for thermal cutting processing according to a ninth aspect of the invention is the cooling medium supply head for thermal cutting processing according to any one of claims 1 to 8, and an inlet of an internal passage of the cooling medium supply head. And a flexible hose as the external cooling medium supply pipe inserted into the pipe to be processed together with the cooling medium supply head, and the hose connected to the inside of the pipe. A hose moving device that extends or retracts toward the head.

  According to the first aspect of the present invention, heat is generated by processing by inserting the coolant into the position corresponding to the processing location by the thermal cutting beam and injecting the cooling medium from the injection nozzle on the outer peripheral portion of the head body. Since the portion can be efficiently cooled, adverse effects due to heat can be sufficiently suppressed, and high machining accuracy can be maintained. In addition, by positioning the head body inside the machining surface, the head body can function as a shield, so that the thermal cutting beam can be blocked from reaching the pipe inner wall on the opposite side of the machining surface. . Moreover, it is possible to prevent the spatter from scattering to the pipe inner wall on the opposite side of the processing surface.

  In addition, since the head body is connected to the external cooling medium supply pipe via the rotary joint, the cooling medium supply pipe is not rotated even when the pipe is rotated during thermal cutting. Only the medium supply head can be rotated following the rotation of the pipe. Therefore, even when processing a square pipe, a cooling medium supply head having an appropriate size according to the size of the square pipe can be used, and the processing quality can be improved. Then, by injecting the cooling medium supplied through the rotary joint from the injection nozzle into the pipe through the internal passage, the inside of the pipe can be cooled and spatter adhesion and dust scattering can be prevented.

  According to the invention of claim 2, since the guide member for reducing the sliding resistance of the head main body with respect to the inner wall of the pipe is provided in the head main body, the external cooling medium supply pipe is constituted by a flexible hose. Even in such a case, the cooling medium supply head can be smoothly moved in the pipe by extending the hose.

  According to the invention of claim 3, since the plurality of rollers are provided as the guide member, the cooling medium supply head can be smoothly moved in the pipe with a small resistance due to rolling.

  According to the invention of claim 4, since the brush is provided as the guide member, the cooling medium supply head can be smoothly moved in the pipe with a simple configuration.

  According to the invention of claim 5, since the head body having a substantially X-shaped cross section having a recess in the portion corresponding to the four sides of the square pipe is used, when the four sides of the square pipe are cut, the cooling medium is supplied. An appropriate distance can be maintained between the head and the thermal cutting head, and the cooling medium supply head can be prevented from being directly damaged by the thermal cutting beam.

  According to the invention of claim 6, when the cutting process by the thermal cutting beam is performed from the front end side of the pipe and the cooling medium is supplied from the rear end side of the pipe, the cooling medium is jetted obliquely rearward, It is possible to prevent the cooling medium from directly hitting the position irradiated with the thermal cutting beam.

  According to the invention of claim 7, since the mixed mist of air and water is injected as the cooling medium, an efficient cooling effect can be obtained.

  According to the eighth aspect of the present invention, the cooling medium naturally oozes to the outer surface of the head main body, so that the head main body can be cooled and damage to the cooling medium supply head due to heat can be prevented.

  According to the ninth aspect of the present invention, the position of the cooling medium supply head can be changed by attaching the cooling medium supply head to the tip of the hose via the rotary joint, and feeding and pulling the hose with the hose moving device. As a result, the pipe can be cooled in accordance with the processing conditions with a simple configuration.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 is an overall side view of a thermal cutting processing apparatus incorporating a cooling medium supply head and a pipe cooling device of the embodiment, FIG. 2 is an overall plan view thereof, and FIG. 3 is a moving direction of the thermal cutting processing head with respect to a square pipe as a workpiece. (A) is a front view of the pipe and the thermal cutting head, (b) is a side view of the pipe and the thermal cutting head, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1, and FIG. FIGS. 6A and 6B are configuration diagrams of the cooling medium supply head, where FIG. 6A is a plan view, FIG. 6B is a side view, and FIG. 6 is a cross-sectional view seen from the front showing the relationship between the thermal cutting head, pipe, and cooling medium supply head.

  As shown in FIGS. 1 and 2, the thermal cutting apparatus includes a cutting unit 10 that cuts a square pipe (work) W in a horizontal posture by irradiation with a laser beam (thermal cutting beam), and a work of the cutting unit 10. A pipe support 50 arranged rearward in the feed direction, a flexible double-pipe hose 150 for supplying refrigerant inserted into the pipe W, and a hose for feeding and pulling back the hose 150 It is comprised from the moving apparatus 60 grade | etc.,.

  The cutting unit 10 clamps the thermal cutting head 12 for cutting the pipe W by irradiating the peripheral wall from the outside of the pipe W with the thermal cutting beam and the front end side of the pipe W to be processed, and rotates the index as necessary. A pipe that positions the cutting portion of the pipe W with respect to the thermal cutting head 12 by feeding and moving the front end of the pipe W forward (in the direction of arrow A) via the clamp / index mechanism 14 and the clamp / index mechanism 14 A feeding mechanism 16 and a dust collecting device 20 for sucking dust generated during the cutting process are provided.

  As shown in FIG. 3, the thermal cutting head 12 includes an X-axis direction along the longitudinal direction of a pipe W that is a workpiece, a Y-axis direction orthogonal to the X-axis direction in a horizontal plane, and a Z-axis that is a vertical direction. The movement is controlled in the directions, and the pipe W is cut by the movement control in these directions.

  The pipe support base 50 is disposed behind the cutting unit 10 in the pipe feeding direction (arrow A direction) and supports the rear end side of the pipe W extending outside the cutting unit 10. The hose 150 is a pipe support base. The pipe W is inserted into the pipe W supported by 50 from the rear end.

  A cooling medium supply head 100 is attached to the tip of the hose 150. This cooling medium supply head 100 is inserted inside the cutting position of the pipe W by the thermal cutting head 12 so that the thermal cutting beam irradiated from the thermal cutting head 12 passes (the pipe inner wall facing the processing surface). And a function of supplying a cooling medium to the inside of the pipe W. A hose moving device 60 is provided at the rear end of the pipe support 50 to feed and retract the hose 150 so that the position of the cooling medium supply head 100 corresponds to the position of the thermal cutting head 12.

  The pipe support base 50 includes a pipe support cylinder 52 that accommodates the pipe W, and pedestals 71, 72, 73, and 75 with casters 78 that support the pipe support cylinder 52. The hose moving device 60 has a rear end. It is mounted on a gantry 75 with casters 78. The hose moving device 60 includes a drum 62 around which the hose 150 is wound, a pinch roller 64 that feeds and retracts the hose 150, and a drive that drives the drum 62 and the pinch roller 64 to synchronize with the thermal cutting head 12. And a motor 66.

  The pipe support cylinder 52 is formed in a telescopic structure in which a plurality of cylinders 52A, 52C, and 52C are combined so as to be slidable in a nested manner. , 75 are provided, and the entire length can be expanded and contracted by moving using the casters 78.

  Further, the pipe support base 50 can be expanded and contracted by the telescopic structure, and as shown in FIG. 2, the whole including the bases 71, 72, 73 and 75 extends rearward from the cutting unit 10. The pipe W is provided so as to be movable between a use position P1 on the extension line of the pipe W and a side retraction position P2 off the extension line. In this case, a hinge 59 is provided between the frame 71 of the foremost cylinder 52A and the frame of the cutting unit 10, and the pipe support 50 is moved 90 degrees on the floor surface with the hinge 59 as a fulcrum. By rotating as shown by the arrow E, it is possible to move between the use position P1 and the retracted position P2. When the pipe support 50 is positioned at the use position P1, the front end of the foremost cylindrical body 52A is airtightly connected to the duct portion on the cutting unit 10 side via the seal portion S.

  As shown in FIG. 4, the pipe support cylinder 52 includes a U-shaped flange member 41 whose upper surface is open, and an openable / closable transparent cover 42 that closes the upper surface opening of the flange member 41. The hinge 43 is connected to the side wall of the flange member 41.

  In addition, a substantially U-shaped resin pipe receiving member 56 that receives the pipe W with an arc-shaped curved inner surface is provided at an appropriate position in the longitudinal direction inside the flange member 41.

  In addition, a suction passage 54 for collecting dust is provided below the pipe support cylinder 52. Similarly to the pipe support cylinder 52, the suction passage 54 is also formed in a telescopic structure in which a plurality of pipes 54A, 54B, 54C are slidably combined, and is combined with the cylinders 52A, 52B, 53B to form each frame 71, 72, 73, 75. The front end of the suction passage 54 is connected to the suction duct of the dust collector 20 of the cutting unit 10, and the rear end is connected to the rear end of the support cylinder 52. Therefore, the fluid in the pipe support cylinder 52 can be drawn to the dust collector 20 in the cutting unit 10 through the suction passage 54 as indicated by an arrow B.

  Next, a cooling device 500 for thermal cutting processing that includes the cooling medium supply head 100, the cooling medium hose 150, and the hose moving device 60 will be described.

  First, when the cooling medium supply head 100 cuts the pipe W by irradiating the thermal cutting beam from the outside toward the peripheral wall of the pipe W from the thermal cutting head 12, the cooling medium supply head 100 is inserted into the pipe W, and the pipe W The cooling medium supply head 100 of this embodiment is configured as shown in FIG.

  That is, the cooling medium supply head 100 includes a head main body 100A having a cross-sectional shape corresponding to the inner peripheral shape of the pipe W, a cooling medium spray nozzle 120 provided on the outer peripheral portion of the head main body 100A, and the head main body 100A. The head body 100 </ b> A is rotated with respect to the tip of an external hose (cooling medium supply pipe) 150 provided at the inlet of the internal passage 110 and the internal passage 110. And a rotary joint 106 that is freely connected.

  A coupler 108 is provided between the rotary joint 106 and the tip of the hose 150 to release the connection in the event of an abnormality. The coupler 108 functions to prevent the cooling medium supply head 100 from being damaged by disconnecting the connection when an excessive force is applied due to being caught by interference such as scrap.

  The head body 100A is provided with a plurality of rollers 130 as guide members for reducing the sliding resistance of the head body 100A with respect to the inner wall of the pipe W. These rollers 130 roll in contact with the inner wall of the pipe W, and are provided so as to be able to contact the inner wall of the pipe W with play even if the size of the pipe W changes. It is arranged in a balanced manner on the top, bottom, left and right.

  In the head main body 100A, the front portion 102 is a portion where the injection nozzle 120 is formed, and the rear portion 104 is a portion where the roller 130 is provided. An inlet is provided, and the inlet is connected to the tip of the hose 150 via the rotary joint 106. In addition, the front end of the internal passage 110 is closed by a plug member 112. And the front-end | tip of many branch channel | paths 114 branched from the internal channel | path 110 is opening in the outer peripheral surface of the head main body 100A as the injection nozzle 120. FIG.

  In this case, the branch passage 114 is formed with an angle (for example, 45 degrees) so that the cooling medium that has passed through the branch passage 114 is jetted obliquely backward from the jet nozzle 120.

  The position of the head main body 100 </ b> A is controlled so that the front portion 102 is located just inside the thermal cutting head 12 when being processed by the thermal cutting head 12. Therefore, as shown in FIG. 6, in order to increase protection against heat, the front portion 102 of the head main body 100A is formed in an X-shaped cross section as shown in FIG.

  That is, the front portion 102 of the head body 100A has a square shape that can be inserted into the square pipe W to be processed, and has a substantially X-shaped cross section having recesses 102a in portions corresponding to the four sides of the square pipe. It is formed into a shape.

  By making the front portion 102 of the head main body 100A have such a cross-sectional shape, it is possible to prevent the spatter from being scattered on the inner surface of the pipe W during the cutting process. Further, since the recess 102a is provided, a distance between the surface of the head main body 100A and a processing point by the beam can be increased, so that consumption of the head main body 100A can be reduced.

  The head body 100A is made of a porous carbon material having an infinite number of mesh paths. By using the carbon head main body 100A in this way, heat resistance can be improved, and the cooling medium supplied to the internal passage 110 can be oozed out to the outer surface through an infinite number of reticulated paths. It can cool itself and protect against heat during processing.

  Further, in the present embodiment, air and water are separately sent as cooling media by the hose 150 having a double tube structure, and the mixed mist 200 (cooling medium) of air and water is jetted at the jetting stage.

  Next, the operation will be described.

  When cutting the pipe W, the front end portion of the pipe W is clamped by the clamp / index mechanism 14 in the cutting unit 10, and the feed mechanism 16 is controlled to position the pipe W relative to the thermal cutting head 12. Further, the rear end side of the pipe W is received by the pipe support 50 set at the use position. That is, the cover 42 constituting the pipe support cylinder 52 is opened, the pipe W is inserted into the flange member 41 from above, and the pipe W is received by the pipe receiving member 56. After inserting the pipe W, the cover 42 is closed, and the pipe support cylinder 52 is substantially sealed.

  In this state, the pipe W is cut by the thermal cutting head 12. In the meantime, the cooling medium (air and water) is supplied to the cooling medium supply head 100 through the hose 150, and the cooling medium is injected into the pipe W from the injection nozzle 120 of the cooling medium supply head 100. The position of the cooling medium supply head 100 is adjusted by unwinding or pulling back the hose 150 and is synchronized with the position of the thermal cutting head 12.

  In this way, the processing proceeds while supplying the cooling medium, and at the same time, the dust collecting device 20 is driven, and the internal fluid is sucked from the rear end of the pipe support cylinder 52 through the suction passage 54. Then, dust, scrap, etc. generated by the processing together with the cooling medium supplied into the pipe W are collected and taken into the dust collector 20.

  For example, when cutting the pipe W, the clamp / index mechanism 14 is operated to rotate the pipe W. At this time, the cooling medium supply head 100 rotates together with the rotation of the pipe W, but the hose 150 does not rotate due to the rotary joint 106. Therefore, the cooling medium (air and water) can be smoothly sent to the cooling medium supply head 100 through the hose 150 at all times regardless of the rotation of the cooling medium supply head 100.

  When processing of a certain length is finished, the clamp / index mechanism 14 is released with the clamp released, and a new portion of the pipe W is re-clamped, and the pipe W is moved by a certain length by the feed mechanism 16. Send it out. Then, the next processing is performed in the same manner.

  As described above, in the thermal cutting apparatus according to the present embodiment, the rear end side of the pipe W to be cut can be supported by the pipe support base 50, and therefore, when the long pipe W is processed. In addition, the support of the pipe W in the cutting unit 10 can be stabilized, and the deflection of the processed portion of the pipe W and the displacement of the pipe W during repositioning can be prevented.

  In addition, the hose 150 is inserted from the rear end of the pipe W, and the cooling medium supply head 100 attached to the tip of the hose 150 is moved according to the cutting processing position. Even in this case, it is possible to efficiently supply the cooling medium (indicated by reference numeral 200 in FIG. 5) without waste to only the necessary portions. Further, since the cooling medium supply head 100 can be moved in accordance with the position of the thermal cutting head 100, the beam irradiated from the thermal cutting head 12 can be blocked from reaching the opposite pipe wall, Spatter scattering can be prevented. Therefore, it is possible to improve machining accuracy and improve machining quality.

  Moreover, in this embodiment, since the pipe support cylinder 50 which accommodates the pipe W is formed in the telescopic structure, the length of the pipe support cylinder 52 can be adjusted according to the full length of the pipe W which is a workpiece | work. Further, since the pipe support base 50 can be kept at the retracted position when not required, it does not interfere with other operations.

  Further, since the pipe W can be inserted into the U-shaped flange member 41 from above, the work setting operation can be facilitated. Further, since the cover 42 is made of a transparent material, the current length of the pipe W can be confirmed simply by looking through the cover 42 from above. Further, since the pipe W is supported by the resin pipe receiving member 56 installed inside the flange member 41, the frictional resistance can be reduced and the pipe W can be smoothly fed. In particular, since the pipe W is received by the substantially arc-shaped curved inner surface of the pipe receiving member 56, it is possible to stably support the pipe W so that it does not sway regardless of whether it is a square pipe or a round pipe. Even if the sizes are different, the pipe W can be stably supported.

  Further, in the present embodiment, since the internal cooling fluid is sucked from the rear end of the pipe W, dust generated during processing along with the cooling medium can be collected through the inside of the pipe W. In particular, since the dust collecting device 20 of the cutting unit 10 is used as it is for suction inside the pipe, unnecessary equipment can be eliminated.

  Further, in the present embodiment, the cooling medium supply head 100 is inserted into a position in the pipe W corresponding to the processing location by the thermal cutting beam, and the cooling medium is ejected from the ejection nozzle 120 on the outer peripheral portion of the head main body 100A. As a result, a portion that generates heat by processing can be efficiently cooled, so that adverse effects due to heat can be sufficiently suppressed, and high processing accuracy can be maintained. Further, by positioning the head main body 100A inside the processing surface, the head main body 100A can function as a shield, so that the thermal cutting beam is prevented from reaching the inner wall of the pipe opposite to the processing surface. It is also possible to prevent spatter from scattering up to the inner wall of the pipe on the opposite side of the processed surface.

  In this embodiment, since the head body 100A of the cooling medium supply head 100 is connected to the hose (external cooling medium supply pipe) 150 via the rotary joint 106, the pipe W is rotated during the thermal cutting process. In addition, only the cooling medium supply head 100 can be rotated following the rotation of the pipe W while the hose 150 is not rotated. Therefore, even when processing a square pipe, the cooling medium supply head 100 having an appropriate size according to the size of the square pipe can be used, and the processing quality can be improved.

  Then, the cooling medium supplied through the rotary joint 16 is injected from the injection nozzle 120 into the pipe W through the internal passage 110, thereby cooling the inside of the pipe P and preventing spatter adhesion and dust scattering. can do. In particular, since the cooling medium is sprayed obliquely backward, it is possible to prevent the cooling medium from directly hitting the position where the thermal cutting beam is irradiated, and since the mixed mist of air and water is injected as the cooling medium, the efficiency is improved. A good cooling effect can be obtained.

  Further, since the roller 130 is provided on the head body 100A of the cooling medium supply head 100 as a guide member for reducing the sliding resistance of the head body 100A with respect to the inner wall of the pipe W, the cooling is performed via the flexible hose 150. Even when the medium supply head 100 is pushed and moved, the cooling medium supply head 100 can be smoothly moved in the pipe W. In particular, since the plurality of rollers 130 are provided as guide members, the cooling medium supply head 100 can be smoothly moved in the pipe P with a small resistance due to rolling.

  Further, in the present embodiment, the cross-sectional shape of the front portion 102 of the head body 100A of the cooling medium supply head 100 is formed in a substantially X shape having recesses in portions corresponding to the four sides of the square pipe. When cutting the four sides of the square pipe, an appropriate distance can be maintained between the cooling medium supply head 100 and the thermal cutting head 12, and the cooling medium supply head 100 is directly damaged by the thermal cutting beam. Can be prevented.

  Further, the cooling medium supply head 100 used in the present embodiment has a head main body 100A made of a porous carbon material, so that the cooling medium can naturally ooze out on the outer surface of the head main body 100A. The head main body 100A itself can be cooled, and the cooling medium supply head 100 can be prevented from being damaged by heat.

  In the pipe cooling device 500 used in the present embodiment, the cooling medium supply head 100 is attached to the tip of the hose 150 via the rotary joint 106, and the hose 150 is fed out or pulled back by the hose moving device 60. Thus, since the position of the cooling medium supply head 100 can be changed, the pipe can be cooled according to the processing situation with a simple configuration.

  In the above embodiment, the cooling medium supply head 100 is provided with a plurality of rollers 130 as a guide device. However, as shown in FIG. 7, a plurality of brushes 330 can be provided as the guide device.

  That is, in the cooling medium supply head 300, an injection nozzle 320 that injects the cooling medium that has passed through the internal passage 310 obliquely rearward is provided at the front portion 312 of the X-shaped head main body 300A, and the rear portion of the head main body 300A. A plurality of brushes 330 are attached to the outer peripheral portion of the rear portion 314 of the frame structure, and the head body 300A floats from the inner wall of the pipe W when these brushes 33 come into contact with the inner wall of the pipe W. I am doing so.

  Thus, when the brush 330 is provided as a guide member, the cooling medium supply head 300 can be smoothly moved in the pipe W with a simple configuration.

1 is an overall side view of a thermal cutting apparatus according to an embodiment of the present invention. It is the same whole top view. It is explanatory drawing of the moving direction of the thermal cutting head with respect to the square pipe which is a workpiece | work, (a) is a front view of a pipe and a thermal cutting head, (b) is a side view of a pipe and a thermal cutting head. FIG. 4 is a cross-sectional view taken along arrow IV-IV in FIG. 1. FIG. 2 is a configuration diagram of a cooling medium supply head, where (a) is a plan view and (b) is a side view. It is sectional drawing seen from the front which shows the relationship between a thermal cutting process head, a pipe, and a cooling medium supply head. It is a perspective view which shows the structure of another cooling-medium supply head.

Explanation of symbols

W pipe 12 Thermal cutting head 60 Hose moving device 100, 300 Cooling medium supply head 100A, 300A Head body 102a Recess 106 Rotary joint 110, 310 Internal passage 120, 320 Injection nozzle 130 Roller (guide member)
150 hose (external cooling medium supply pipe)
330 Brush (guide member)
500 Pipe cooler

Claims (9)

Cooling for thermal cutting processing, which is inserted into the pipe and supplies a cooling medium to the inside of the pipe when the thermal cutting beam is irradiated from the outside toward the peripheral wall of the pipe from the thermal cutting head to cut the pipe. A medium supply head,
A head body having a cross-sectional shape corresponding to the inner peripheral shape of the pipe;
An injection nozzle for the cooling medium provided on the outer periphery of the head body;
An internal passage formed inside the head body for supplying a cooling medium to each of the spray nozzles;
A rotary joint provided at the inlet of the internal passage and rotatably connecting the head body to an external cooling medium supply pipe;
A cooling medium supply head for thermal cutting processing, comprising: A cooling medium supply head for thermal cutting according to claim 1,
A cooling medium supply head for thermal cutting, wherein the head body is provided with a guide member for reducing sliding resistance of the head body with respect to the inner wall of the pipe. A cooling medium supply head for thermal cutting according to claim 2,
A cooling medium supply head for thermal cutting processing, wherein the guide member is provided with a plurality of rollers that roll in contact with the inner wall of the pipe. A cooling medium supply head for thermal cutting according to claim 2,
A cooling medium supply head for thermal cutting, wherein the guide member is provided with a brush that comes into contact with the inner wall of the pipe to float the head body from the inner wall of the pipe. A cooling medium supply head for thermal cutting according to any one of claims 1 to 4,
The head body has a substantially X-shaped cross section having a square shape that can be inserted into a square pipe and having recesses in portions corresponding to the four sides of the square pipe. Cooling medium supply head. A cooling medium supply head for thermal cutting according to any one of claims 1 to 5,
A rotary joint connected to the external cooling medium supply pipe is disposed at the rear end of the head body, and the injection nozzle is provided at an angle so as to inject the cooling medium obliquely backward. A cooling medium supply head for thermal cutting. A cooling medium supply head for thermal cutting according to any one of claims 1 to 6,
A cooling medium supply head for thermal cutting, wherein the spray nozzle sprays a mixed mist of air and water as the cooling medium. A cooling medium supply head for thermal cutting according to any one of claims 1 to 6,
The head body is made of a porous carbon material having an infinite number of mesh paths, and the cooling medium supplied to the internal passages can be oozed out to the outer surface through the countless mesh paths. Cooling medium supply head for thermal cutting.   A cooling medium supply head for thermal cutting according to any one of claims 1 to 8, and an inlet of an internal passage of the cooling medium supply head connected via the rotary joint, together with the cooling medium supply head A flexible hose that is inserted into the pipe to be processed as the external cooling medium supply pipe, and a hose moving device that extends and pulls the hose toward the pipe. A pipe cooling device for thermal cutting.

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