JP2014240169A - Butt fusion machine and butt fusion method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To pass through a fused bead without bringing up a fused pipe material.SOLUTION: Provided is a butt fusion machine comprising: a fixed clamp made of the lower clamp 31 and the upper clamp freely rollably supported to the lower clamp 31 and connectable to the lower clamp 31; and a movable clamp made of the lower clamp and the upper clamp freely rollably supported to the lower clamp and connectable to the lower clamp, and supported freely movably to the axial direction of each pipe material, and a pair of the pipe materials are respectively sandwiched at set intervals via the fixed clamp 3 and the movable clamp, further, the marginal parts of a pair of the pipe materials are heated and melted via a heater, and are butted and fused. The lower clamp 31 of the fixed clamp freely detachably includes a semicircumferential ring-shaped supporting material 35 having the semicylindrical inner circumferential face 35b with an inside diameter corresponding to the outside diameter exceeding the outside diameter of fused beads and further having an outer circumferential taper face 35a of each pipe material whose tip is narrowed toward the moving direction of the pipe material Pn.

Description

  The present invention relates to a butt fusion machine and a butt fusion method for fusing pipe materials such as polyethylene pipes.

  Conventionally, pipe materials that are difficult to bond, such as polyethylene pipes, have been fused using a butt fusion machine.

  The butt fusion machine 1 is movable along a pair of fixed clamps 3 fixed to the base 2 and a pair of guide rails 4 provided on the base 2, as shown in FIGS. A heater that is detachably attached to the guide rail 4 between the pair of movable clamps 5 inserted and inserted into the base, the moving cylinder 6 disposed between the base 2 and the movable clamp 5, and the fixed clamp 3 and the movable clamp 5. 7. Each fixed clamp 3 includes a lower clamp 31 fixed to the base 2 and an upper clamp 32 supported by the lower clamp 31 so as to be rotatable about a horizontal axis and connectable to the lower clamp 31. When the clamp 32 is rotated around the horizontal axis and connected to the lower clamp 31, a substantially cylindrical surface having an inner diameter corresponding to the outer diameter of the pipe material P to be fused by the lower clamp 31 and the upper clamp 32 is formed. Each has a substantially semi-cylindrical support surface 31a, 32a. Each movable clamp 5 includes a lower clamp 51 that is movably fitted to the pair of guide rails 4, and an upper clamp that is supported by the lower clamp 51 so as to be rotatable about a horizontal axis and that can be connected to the lower clamp 51. When the upper clamp 52 is rotated about the horizontal axis and connected to the lower clamp 51, a substantially cylindrical surface having an inner diameter corresponding to the outer diameter of the pipe P fused by the lower clamp 51 and the upper clamp 52 is formed. As formed, each has a substantially semi-cylindrical support surface 51a, 52a.

  In order to fuse the pipe material P using such a butt fusion machine 1, the pipe materials P and P are supported by the lower clamps 31 and 51 of the fixed clamp 3 and the movable clamp 5 with a set interval, respectively, By rotating the clamps 32 and 52 and connecting them to the lower clamps 31 and 51, the pipe materials P and P are respectively clamped (see FIG. 7A). Next, after arranging the heater 7 on the guide rail 4 between the pipe materials P and P, the moving cylinder 6 is extended and moved, and the movable clamp 5 is moved along the guide rail 4 toward the fixed clamp 3. At this time, the pipe P sandwiched between the movable clamps 5 hits the heater 7, moves the heater 7 along the guide rail 4, and hits the heater 7 against the pipe P sandwiched between the fixed clamps 3. That is, each edge part of the pipe materials P and P is pressed against the heater 7 and heated and melted (see FIG. 7B). When the edge portions of the pipe materials P and P are melted, the moving cylinder 6 is contracted and the heater 7 is detached from the guide rail 4, and then the moving cylinder 6 is immediately extended to be clamped by the fixed clamp 3. The molten edge of the tubular material P sandwiched by the movable clamp 5 is abutted against the molten edge of the tubular material P, and the two are integrally fused (see FIG. 7C) (for example, Patent Document 1, 2).

Japanese Patent Laid-Open No. 7-80939 Japanese Patent Laid-Open No. 7-214674

  By the way, in the case where the tube material P having a unit length is sequentially butt-fused to form a tube material having a set length, in order to fuse a new tube material P to the plurality of previously welded tube materials Pn, It is necessary to move a plurality of pipe materials Pn fused to each other in the axial direction, face the end edges of the new pipe materials P with a set interval, and sandwich the pipe materials Pn. On the other hand, a fused bead b that bulges in and out is formed in the fused portion of the pipe materials P and P that have been butt fused. Accordingly, when moving the plurality of fused pipe materials Pn in the axial direction, the fused beads b of the pipe material Pn interfere with the support surface 31a of the lower clamp 31 that supports the pipe material Pn, and move in the axial direction. This cannot be performed (see FIG. 8).

  For this reason, although not shown in detail, a roller base in which a guide roller capable of supporting the pipe material is provided so as to be movable up and down via an air cylinder is arranged before and after the butt fusion machine, and the pipe material to be connected at the time of fusion In addition to supporting the plurality of previously fused pipe materials on the guide rollers of the roller base, when the fusion is completed, the air cylinder is extended to support the fused pipe material with the guide rollers. The pipe material fused by using a winch or the like is pulled to prevent interference of the fusion bead with the fixed clamp.

  As described above, it is necessary to install the roller mounts equipped with the air cylinders before and after the butt fusion machine, and there are problems that the cost is increased and the operation becomes complicated.

  The present invention has been made in view of such a problem, and provides a butt fusion machine and a butt fusion method capable of passing a fusion bead without lifting a fused pipe material. .

  The butt fusion machine of the present invention includes a lower clamp and an upper clamp that is rotatably supported by the lower clamp and can be connected to the lower clamp, and includes a fixed clamp that can clamp a pipe member, a lower clamp, and the lower clamp. It consists of an upper clamp that is pivotally supported and can be connected to a lower clamp, and is supported so as to be movable in the axial direction of the tube material, and also has a movable clamp that can clamp the tube material, via a fixed clamp and a movable clamp. In the butt fusion machine that sandwiches the pair of pipe materials at a set interval, heats and melts the edge portions of the pair of pipe materials through a heater, and abuts and fuses the lower clamp of the fixed clamp, It has a semi-cylindrical inner peripheral surface with an inner diameter corresponding to the outer diameter of the tube material, and has a semi-cylindrical outer peripheral surface or tube material with an outer diameter exceeding the outer diameter of the fusion bead. It is characterized in further comprising a semi-circular ring-shaped support member toward a direction of movement with the outer peripheral tapered surface or R surface of tapered-off detachably.

  According to the present invention, a fixed clamp and a movable clamp are connected to hold a pair of pipe materials, and their end edges are heated and melted, butted and bonded, and then the fixed clamp and the movable clamp are disconnected. Then, by removing the support material of the lower clamp in the fixed clamp, a space larger than the outer diameter of the weld bead of the tube material is formed below the tube material in the lower clamp. Therefore, when the welded pipe material is moved using a winch or the like, the weld bead can be moved without interfering with the lower clamp of the fixed clamp. As a result, there is no need for a device or the like for lifting the long fused pipe material, the cost can be reduced, and the work can be easily performed.

  In the present invention, the lower clamp and the upper clamp of the fixed clamp, and the lower clamp and the upper clamp of the movable clamp are each composed of a clamp body and a liner detachably fixed to the clamp body. The liner of the lower clamp is composed of a liner main body and a support material detachably fixed to the liner main body, and the inner peripheral surface of the liner main body and the outer peripheral surface of the support material supported by the inner peripheral surface of the liner main body are half It is preferable that the surface is a cylindrical peripheral surface or a tapered surface or an R surface tapered toward the moving direction of the pipe material. As a result, by preparing a liner corresponding to the outer diameter of the pipe material, it is possible to replace it with a liner corresponding to the outer diameter of the pipe material. can do.

  The butt fusion machine of the present invention includes a lower clamp and an upper clamp that is rotatably supported by the lower clamp and can be connected to the lower clamp, and includes a fixed clamp that can clamp a pipe member, a lower clamp, and the lower clamp. It consists of an upper clamp that is pivotally supported and can be connected to a lower clamp, and is supported so as to be movable in the axial direction of the tube material, and also has a movable clamp that can clamp the tube material, via a fixed clamp and a movable clamp. In the butt fusion machine that sandwiches the pair of pipe materials at a set interval, heats and melts the edge portions of the pair of pipe materials through a heater, and abuts and fuses the lower clamp of the fixed clamp, A substantially semi-cylindrical inner peripheral surface with an inner diameter corresponding to the outer diameter of the tube material and an inner diameter that exceeds the outer diameter of the weld bead of the tube material toward the moving direction of the tube material It is characterized in that it has an inner peripheral tapered surface of the Subomari.

  According to the present invention, a fixed clamp and a movable clamp are connected to hold a pair of pipe materials, and their end edges are heated and melted, butted and bonded, and then the fixed clamp and the movable clamp are disconnected. To do. Next, when the welded pipe material is moved using a winch or the like, the weld bead comes into contact with the inner peripheral taper surface formed on the lower clamp of the fixed clamp, and is lifted along the inner peripheral taper surface. It can reach the inner peripheral surface that supports the outer peripheral surface and can overcome it. As a result, there is no need for a device or the like for lifting the long fused pipe material, the cost can be reduced, and the work can be easily performed.

  In the present invention, the lower clamp and the upper clamp of the fixed clamp, and the lower clamp and the upper clamp of the movable clamp are each composed of a clamp body and a liner detachably fixed to the clamp body. The liner of the lower clamp is formed in a fan-shaped ring shape, and has an inner peripheral surface corresponding to the outer diameter of the pipe material, and an inner diameter that exceeds the outer diameter of the welded bead of the pipe material, toward the moving direction of the pipe material It is preferable to have a tapered inner circumferential tapered surface. As a result, by preparing a liner corresponding to the outer diameter of the pipe material, it is possible to replace it with a liner corresponding to the outer diameter of the pipe material. can do.

  The butt fusion method of the present invention is a tube butt fusion method in which a pair of pipe materials are sandwiched in a facing state at a set interval, and then their edge portions are heated and melted, and the butt fusion method is performed by abutting and fusing. The step of sandwiching and fusing the tube material to the movable clamp and the fixed clamp of the butt fusion machine according to Item 1 or 2, and the tube material fused by releasing the support and releasing the support material in the axial direction And a step of moving to the position.

  According to the present invention, after sandwiching and fusing the tube material to the movable clamp and the fixed clamp of the butt fusion machine according to claim 1 or 2, respectively, the holding of the tube material by the movable clamp and the fixed clamp is released, The tube material fused by separating the support material is moved in the axial direction. At this time, the space corresponding to the support member is positioned below the pipe member and formed in the lower clamp, so that the weld bead of the welded pipe member can be moved without interfering with the lower clamp of the fixed clamp. This eliminates the need for a device for lifting the fused long tube material, reduces costs, and allows easy operation.

  The butt fusion method of the present invention is a tube butt fusion method in which a pair of pipe materials are sandwiched in a facing state at a set interval, and then their edge portions are heated and melted, and the butt fusion method is performed by abutting and fusing. The step of sandwiching and fusing the tube material to the movable clamp and the fixed clamp of the butt fusion machine according to Item 3 or 4, and the step of releasing the nipping and moving the fused tube material in the axial direction It is characterized by including.

  According to the present invention, the tube material is clamped and fused to the movable clamp and the fixed clamp of the butt fusion machine according to claim 3 or 4, respectively, and then the clamp of the tube material by the movable clamp and the fixed clamp is released to be melted. The worn pipe is moved in the axial direction. At this time, the lower clamp has an inner diameter that exceeds the outer diameter of the weld bead of the tube material and has an inner peripheral tapered surface that is tapered in the moving direction of the tube material, so that the weld bead of the welded tube material is provided. Contacts the inner taper surface formed in the lower clamp of the fixed clamp, is lifted along the inner taper surface, reaches the inner surface supporting the outer surface of the tube material, and can overcome it. This eliminates the need for a device for lifting the fused long tube material, reduces costs, and allows easy operation.

  According to the present invention, it is possible to pass the fusion bead without lifting the fused pipe material.

It is a perspective view showing typically one embodiment of the fixed clamp in the butt fusion machine of the pipe material of the present invention. It is a perspective view which shows the downward clamp of the fixed clamp of FIG. FIG. 3 is an exploded perspective view of the lower clamp of FIG. 2. It is the top view and front view which show the lower clamp of FIG. 2 with the pipe material which carried out the butt melt | fusion. It is the top view and front view which show other embodiment of a downward clamp with the pipe material which carried out the butt fusion | fusion. It is a perspective view which shows a butt melt | fusion machine. It is process drawing which illustrates the butt melt | fusion method of a pipe material typically. It is a side view explaining the relationship between the downward clamp of the conventional fixed clamp, and the melt | fusion bead of the fused pipe material.

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

  Note that, as described above, the butt fusion machine 1 includes a pair of fixed clamps 3 fixed to the base 2 and a pair of slidably fitted along a pair of guide rails 4 provided on the base 2. The movable clamp 5, the moving cylinder 6 disposed between the base 2 and the movable clamp 5, and the heater 7 detachably installed on the guide rail 4 between the fixed clamp 3 and the movable clamp 5. Constituent points are the same, and the same members are denoted by the same reference numerals, detailed description thereof is omitted, and different points are mainly described.

  FIG. 1 shows an embodiment of a fixed clamp 3 in a butt fusion machine 1.

  The lower clamp 31 and the upper clamp 32 of the fixed clamp 3 are composed of clamp bodies 311 and 321 and a liner 33 that is detachably fixed to the clamp bodies 311 and 321. The liner 33 of the lower clamp 31 includes, as shown in FIGS. 2 to 4, a liner body 34 that is detachably fixed to the clamp body 311, and a support member 35 that is detachably fixed to the liner body 34. It is composed of

  The clamp body 311 of the lower clamp 31 has a semi-cylindrical inner peripheral surface 311a, and a fitting groove 311b is formed in the inner peripheral surface 311a. The liner main body 34 constituting the liner 33 has a semi-cylindrical outer peripheral surface 34a having an outer diameter corresponding to the inner diameter of the inner peripheral surface 311a of the clamp main body 311, and the outer peripheral surface 34a is fitted with the clamp main body 311. A fitting protrusion 34b is formed corresponding to the joint groove 311b. Accordingly, the liner main body 34 is dropped with the outer peripheral surface 34a facing the inner peripheral surface 311a of the clamp main body 311 so that the fitting protrusion 34b of the liner main body 34 is fitted into the fitting groove 311b of the clamp main body 311. be able to. Furthermore, the liner main body 34 has a semicircular truncated conical tapered surface 34c that is tapered in the moving direction of the pipe P, and the inner diameter on the small diameter side is the outer diameter of the fusion bead b of the pipe P. It is formed in a larger diameter than.

  On the other hand, the support member 35 constituting the liner 33 includes a semi-conical outer peripheral tapered surface 35a corresponding to the inner peripheral tapered surface 34c of the liner main body 34 and a semi-cylindrical inner surface having an inner diameter corresponding to the outer diameter of the tube material P. The inner peripheral surface 35b of the support member 35 coincides with the support surface of the liner 33, that is, the support surface 31a of the lower clamp 31.

  The liner main body 34 and the support member 35 have connection holes formed through the tapered surfaces 34c and 35a, and a set screw 36 is inserted into these connection holes, and a nut 361 is screwed into the integral. And the liner 33 can be formed.

  Further, the clamp body 321 of the upper clamp 32 in the fixed clamp 3 is not shown in detail, but like the clamp body 311 of the lower clamp 31, a semi-cylindrical inner peripheral surface and a fitting formed on the inner peripheral surface thereof. Has a groove. The liner 33 of the upper clamp 32 has an outer peripheral surface and a fitting protrusion corresponding to the inner peripheral surface of the clamp main body 321 and the fitting groove, although not shown in detail. The fitting protrusion of the liner 33 can be fitted into the fitting groove of the clamp body 321 by dropping the liner 33 with the outer peripheral surface facing the surface. Further, the liner 33 has a semi-cylindrical inner peripheral surface 33 a having an inner diameter corresponding to the outer diameter of the tube material P, and coincides with the support surface 32 a of the upper clamp 32.

  In this case, in order to prevent the liner 33 from falling off from the clamp body 321, it is preferable that a hook or the like is installed and fixed over the clamp body 321 and the liner 33.

  Further, although not shown in detail, the lower clamp 51 and the upper clamp 52 of the movable clamp 5 are also made of a clamp body and a liner that can be detachably fixed to the clamp body, similarly to the upper clamp 32 of the fixed clamp 3 described above. Each liner has a semi-cylindrical inner peripheral surface having an inner diameter corresponding to the outer diameter of the pipe member P, and corresponds to the support surfaces 51a and 52a of the lower clamp 51 and the upper clamp 52, respectively.

  Accordingly, in the upper clamp 32 of the fixed clamp 3, the lower clamp 51 of the movable clamp 5, and the upper clamp 52, a plurality of types of liners having a semi-cylindrical inner peripheral surface having an inner diameter corresponding to the outer diameter of the tube material P to be butt-fused. Is selected, a liner having an inner peripheral surface (support surface) having an inner diameter corresponding to the outer diameter of the pipe P is selected, the clamp body 321 of the upper clamp 32 of the fixed clamp 3, the lower clamp 51 of the movable clamp 5, and By fixing to each clamp main body of the upper clamp 52, the pipe material P from which an outer diameter differs can be supported and clamped.

  In this case, with respect to the lower clamp 31 of the fixed clamp 3, the liner 33 is composed of the liner main body 34 and the support member 35, so that the semicircular inner peripheral surface 35b having an inner diameter corresponding to the outer diameter of the tube material P and its A plurality of support members 35 having an outer peripheral tapered surface 35a having an inner diameter larger than the outer diameter of the fusion bead b are prepared, and the support member 35 is selected according to the outer diameter of the tube material P, and the corresponding liner By fixing to the main body 34, the liner 33 corresponding to the outer diameter of the pipe P can be formed, and this liner 33 may be fixed to the clamp main body 311 of the lower clamp 31.

  Next, a procedure for fusing the pipe materials P and P using the butt fusing machine 1 configured as described above will be described.

  In an initial state, a liner 33 having an inner peripheral surface 33 a having an inner diameter corresponding to the outer diameter of the pipe material P to be fused is fixed to the upper clamp 32 of each fixed clamp 3. Further, the lower clamp 31 of each fixed clamp 3 has an inner peripheral surface 35b having an inner diameter corresponding to the outer diameter of the pipe material P to be fused, and a fusion bead b formed by fusing the pipe material P. A liner 33 including a support member 35 having an outer peripheral tapered surface 35a having a diameter larger than the outer diameter and a liner main body 34 having an inner peripheral tapered surface 34c corresponding to the support member 35 is fixed. Further, for the lower clamp 51 and the upper clamp 52 of the movable clamp 5, as with the upper clamp 32 of the fixed clamp 3, a liner having an inner peripheral surface with an inner diameter corresponding to the outer diameter of the pipe P to be fused is fixed. Yes. Furthermore, the upper clamp 32 of each fixed clamp 3 is released from the lower clamp 31 and is flipped upward. Similarly, the upper clamp 52 of each movable clamp 5 is also released from the lower clamp 51 and is flipped upward.

  In such a state, the pipe members P and P are supported on the support surfaces 31a and 51a of the lower clamps 31 and 51 in the fixed clamp 3 and the movable clamp 5, respectively, and positioned so as to face each other at a set interval, By rotating the clamps 32 and 52 downward and connecting them to the lower clamps 31 and 51, the pipe materials P and P are respectively clamped.

  In addition, before and after the butt fusion machine 1, a roller mount (not shown) provided with a guide roller rotatably is installed, and the other end portion of the tube material P is movably supported.

  Next, after installing the heater 7 on the guide rail 4 between the pipe materials P and P, the moving cylinder 6 is extended, and the movable clamp 5 is moved along the guide rail 4 toward the fixed clamp 3. As a result, the pipe P sandwiched between the movable clamps 5 is abutted against the heater 7 and the heater 7 is moved along the guide rail 4. At the same time, the heater 7 is moved and abutted against the tube material P sandwiched between the fixed clamps 3. Therefore, each edge part of the pipe materials P and P is pressed against the heater 7 to be heated and melted.

  When the edge portions of the pipe materials P and P are melted, the moving cylinder 6 is contracted and the heater 7 is detached from the guide rail 4. Then, the moving cylinder 6 is immediately extended and held between the movable clamps 5. The melted edge portion of the tube material P is abutted against the melted edge portion of the tube material P sandwiched between the fixed clamps 3 at a set pressure, and the two are fused together.

  When the set cooling time elapses, the pressure acting on the moving cylinder 6 is released, and then the upper clamp 32 is disconnected from the lower clamp 31 of each fixed clamp 3 and jumped upward, and each movable clamp 5 The upper clamp 52 is disconnected from the lower clamp 51 and is flipped upward. Further, in the lower clamp 31 of each fixed clamp 3, the connection of the support member 35 by the set screw 36 and the nut 361 to the liner body 34 of the liner 33 is released, and the support member 35 is detached from the liner body 34. When the support member 35 is detached from the liner main body 34, the inner diameter of the small-diameter side end edge portion of the inner peripheral tapered surface 34c of the liner main body 34 is set larger than the outer diameter of the fusion bead b. When the pipe material Pn formed by fusing the pipe material P is pulled using a winch or the like, the fusion bead b can be moved without interfering with the lower clamp 31 of the fixed clamp 3.

  When the fused bead b of the fused pipe material Pn passes through the fixed clamp 3, the moving cylinder 6 is contracted to retract the movable clamp 5 to the original position and to the inner peripheral tapered surface 34 c of the liner main body 34. The support material 35 is pushed in so that the outer peripheral tapered surface 35a comes into contact, and is connected via a set screw 36 and a nut 361, so that the next pipe material P can be prepared for fusion.

  Thereafter, the pipe P to be newly fused is clamped at the set position by the movable clamp 5 and the previously fused pipe Pn is clamped at the set position, and then the pipes P and Pn are connected. It is possible to form a pipe having a set length by repeatedly fusing and then pulling the fused pipe Pn by releasing the support member 35.

  It should be noted that as the length of the pipe material Pn is increased by fusing the pipe material P by the butt fusing machine 1, the roller mounts may be additionally installed along the pulling direction of the pipe material Pn at a set interval.

  As described above, the liner 33 of the lower clamp 31 in the fixed clamp 3 can be detachably fixed to the clamp body 311, and can be detachably fixed to the liner body 34. Next, the welding bead b of the fused pipe material Pn is not interfered with the lower clamp 31 of the fixed clamp 3 by a simple work such as the material 35 and the support material 35 being detached at the end of the fusion work. It can be moved in preparation for fusion with the pipe P.

  In the above-described embodiment, the liner 33 of the lower clamp 31 in the fixed clamp 3 is composed of the liner main body 34 and the support member 35, and the liner main body 34 and the support member 35 are integrally fixed via the tapered surfaces 34c and 35a. However, the present invention is not necessarily limited to the tapered surface. For example, a cylindrical surface or a circular arc surface corresponding to each other may be formed and fixed integrally.

  FIG. 5 shows another embodiment of the lower clamp 31 of the fixed clamp 3 in the butt fusion machine 1.

  The lower clamp 31 of the fixed clamp 3 includes a clamp body 311 and a liner 33 that is detachably fixed to the clamp body 311.

  In this case, the liner 33 is formed in a fan-shaped ring having a central angle smaller than 180 degrees, and the outer peripheral surface 33b has an outer diameter corresponding to the inner diameter of the inner peripheral surface 311a of the clamp body 311. The fitting protrusions 33 c formed on the outer peripheral surface 33 b are formed corresponding to the fitting grooves 311 b formed on the inner peripheral surface 311 a of the clamp body 311. The liner 33 has an inner peripheral surface 33a having an inner diameter corresponding to the outer diameter of the pipe material P, and an inner peripheral tapered surface 33d having a substantially semi-conical truncated shape that is tapered in the moving direction of the pipe material P. ing. Here, the inner diameter of the inner diameter tapered surface 33d is set to be larger than the outer diameter of the fusion bead b.

  Therefore, as described above, when the fused pipe material Pn is pulled using a winch or the like after the pair of pipe materials P and P are fused, the fusion bead b of the pipe material Pn It contacts the tapered surface 33d and is lifted along the tapered surface 33d. At this time, since the liner 33 is formed in a fan-shaped ring shape and reduces the contact area of the pipe material Pn with the fusion bead b, the fusion bead b has a continuous inner circumference along the inner circumferential tapered surface 33d. It is easily lifted up to the surface 33a. When the fusion bead b exceeds the inner peripheral surface 33a, the outer peripheral surface of the pipe material P falls into the inner peripheral surface 33a and is supported.

  Thus, if the connection between the fixed clamp 3 and the movable clamp 5 is released after the fusion work is finished, the pipe material Pn can be immediately pulled by the winch or the like, and the work becomes simple and can be executed in a short time. it can.

DESCRIPTION OF SYMBOLS 1 Butt fusion machine 2 Base 3 Fixed clamp 31 Lower clamp 32 Upper clamp 311, 321 Clamp main body 33 Liner 34 Liner main body 35 Support material 5 Movable clamp 51 Lower clamp 52 Upper clamp P, Pn Pipe material b Fusion bead

Claims (6)

  A lower clamp and an upper clamp rotatably supported by the lower clamp and connectable to the lower clamp, and a fixed clamp capable of sandwiching a pipe member, and a lower clamp rotatably supported by the lower clamp and the lower clamp An upper clamp that can be connected to the tube, and is supported so as to be movable in the axial direction of the tube material, and a movable clamp that can sandwich the tube material. In the butt fusion machine in which the end edges of the pair of pipes are heated and melted via a heater and are bonded to each other, the lower clamp of the fixed clamp has an inner diameter corresponding to the outer diameter of the pipe. It has a semi-cylindrical inner peripheral surface and is tapered toward the moving direction of the semi-cylindrical outer peripheral surface or tube material with an outer diameter exceeding the outer diameter of the fusion bead. Butt fusion machine, characterized in that it comprises a detachable semicircular ring-like support member having a Rino outer peripheral tapered surface or R surface.   2. The butt fusion machine according to claim 1, wherein the lower clamp and upper clamp of the fixed clamp and the lower clamp and upper clamp of the movable clamp are respectively detachably fixed to the clamp body and the clamp body. The liner of the lower clamp in the fixed clamp is composed of a liner main body and a support member detachably fixed to the liner main body, and is supported on the inner peripheral surface of the liner main body and the inner peripheral surface of the liner main body. A butt fusion machine characterized in that the outer peripheral surface of the support member is a semi-cylindrical peripheral surface or a tapered surface or an R surface tapered in the moving direction of the tube material.   A lower clamp and an upper clamp rotatably supported by the lower clamp and connectable to the lower clamp, and a fixed clamp capable of sandwiching a pipe member, and a lower clamp rotatably supported by the lower clamp and the lower clamp An upper clamp that can be connected to the tube, and is supported so as to be movable in the axial direction of the tube material, and a movable clamp that can sandwich the tube material. In the butt fusion machine in which the end edges of the pair of pipes are heated and melted via a heater and are bonded to each other, the lower clamp of the fixed clamp has an inner diameter corresponding to the outer diameter of the pipe. A substantially semi-cylindrical inner peripheral surface and an inner peripheral tapered surface that has an inner diameter that exceeds the outer diameter of the fused bead of the pipe material and is tapered toward the moving direction of the pipe material Butt fusion machine and having a.   4. The butt fusion machine according to claim 3, wherein the lower clamp and the upper clamp of the fixed clamp and the lower clamp and the upper clamp of the movable clamp are respectively detachably fixed to the clamp body and the clamp body. The lower clamp liner in the fixed clamp is formed in a fan-shaped ring shape, and has an inner peripheral surface with an inner diameter corresponding to the outer diameter of the pipe material and an inner diameter exceeding the outer diameter of the fused bead of the pipe material. And a butt fusion machine characterized by having a tapered inner surface tapered in the moving direction of the pipe material.   3. The butt fusion method according to claim 1, wherein a pair of tube materials are sandwiched in a facing state at a set interval, and then the edge portions of the tube materials are heated and melted, and the butt fusion method of the tube material is abutted and fused. Including a step of sandwiching and fusing the pipe material between the movable clamp and the fixed clamp of the dressing machine, and a step of releasing the nipping, releasing the support material, and moving the fused pipe material in the axial direction. A butt fusion method characterized.   5. The butt fusion method according to claim 3, wherein a pair of pipe materials are clamped at a set interval in a facing state, and then end edges of the pipe materials are heated and melted, and the butt fusion method of the pipe materials is abutted and fused. A butt-fusing comprising a step of sandwiching and fusing a pipe member between a movable clamp and a fixed clamp of a dressing machine, and a step of releasing the nipping and moving the fused pipe member in an axial direction. Method.

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