JP2008207372A - Attaching apparatus of cover material to pipe material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an attaching apparatus capable of precisely attaching a cover material such as a nonwoven fabric or the like to the outer peripheral surface of a pipe material such as an already molded pipe joint or the like so as to strictly conform to the outer peripheral surface of the pipe material. <P>SOLUTION: This attaching apparatus 1 is equipped with a core material 21 to which the pipe joint 3 having the nonwoven fabric 2 wound around its outer peripheral surface is external fitted and fixed and an outer mold 22 composed of a plurality of the split mold materials 31, etc. arranged so as to surround the pipe joint 3 fixed to the core material 21 from the outside and made movable in the direction approaching and separated with respect to the pipe joint 3. When the split mold materials 31, etc. of the outer mold 22 are pressed to the whole periphery of the nonwoven fabric 2 of the pipe joint 3 over several times, the pressing regions of respective times are allowed to partially overlap with each other while shifted circumferentially along the outer peripheral surface of the pipe joint 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pipe joint such as a pipe joint for connecting a pipe port member embedded in a hand hole and a cable protection pipe, or a pipe joint for connecting cable protection pipes to each other. The present invention relates to an attachment device for integrally attaching a covering material such as a non-woven fabric for water stop to a surface and an inner peripheral surface.

  In general, a water-absorbing non-woven fabric for water stop is attached to the outer peripheral surface or inner peripheral surface as a pipe joint to connect the pipe port member embedded in the hand hole and the cable protective tube, or to connect the cable protective tubes together. The one attached is known. In the connection structure using such a pipe joint, a water absorbent expandable nonwoven fabric is interposed in the connection portion, and the water absorbable expandable nonwoven fabric absorbs moisture in the ground and expands, so that a gap generated in the connection portion is formed. It is designed to ensure good water-stopping properties.

  In this type of pipe joint, it is necessary to apply the nonwoven fabric with good precision while keeping the nonwoven fabric tightly along the outer peripheral surface and the inner peripheral surface. When poor pasting has occurred, a large force is required to connect the pipe joint to the pipe port member or cable protection tube by inserting or screwing, and the nonwoven fabric is wrinkled or twisted, resulting in a thin part, This makes it difficult to ensure good water stoppage.

  Therefore, conventionally, in order to obtain a pipe joint in which a nonwoven fabric is integrally attached with high precision, as disclosed in Patent Document 1 and Patent Document 2, for example, a mold is used to form a pipe joint. Sometimes, a method of crimping a nonwoven fabric to the outer peripheral surface or inner peripheral surface is employed.

  In Patent Document 1, a non-woven fabric is temporarily attached to a core mold, and a parison for forming a pipe joint is supplied so as to cover the non-woven fabric from the outside. The joint and the nonwoven fabric are integrated. In Patent Document 2, a non-woven fabric is covered with a core mold, the first mold is clamped from the outside to mold the non-woven fabric, and then the second mold is set on the outside of the molded non-woven fabric. A synthetic resin for forming a joint is injected to integrate the pipe joint and the nonwoven fabric.

JP 2003-251686 A Japanese Patent No. 3647857

  However, in the methods disclosed in Patent Document 1 and Patent Document 2 described above, since the nonwoven fabric is pasted at the time of forming the pipe joint, the nonwoven fabric is pasted on the already formed pipe joint. could not.

  When a non-woven fabric is pasted on a pipe joint that has already been formed, a method is adopted in which the non-woven fabric is pressed by a mold in a state where the non-woven fabric is temporarily fixed to the outer peripheral surface or inner peripheral surface of the pipe joint. The molds used at this time are generally halves or quadrants. However, when the nonwoven fabric is pressed with such a mold, the nonwoven fabric is lifted up by the edge of the adjacent divided mold material at the boundary part of the divided mold material of the mold, resulting in a protruding state, resulting in poor adhesion was there.

  In addition, when a non-woven fabric is pasted on the inner peripheral surface of a pipe joint that has already been molded, the non-woven fabric is temporarily fixed to the inner peripheral surface of the pipe joint, and the non-woven fabric is inserted inside the pipe joint or screwed into the fitting. A method of pressing with a core that has been removed may be used. However, in this case, when the core is tightly fitted, the non-woven fabric is wrinkled or twisted due to the frictional resistance between the core and the non-woven fabric. It was difficult to apply the nonwoven fabric with good precision while keeping the nonwoven fabric tightly aligned with the inner peripheral surface of the pipe joint.

  Therefore, the present invention eliminates the above-mentioned problems, and can accurately attach a covering material such as a nonwoven fabric to the outer peripheral surface and inner peripheral surface of a pipe member such as a pipe joint that has already been molded. An object of the present invention is to provide an attachment device for a covering material.

  In order to solve the above-described problem, the attachment device 1 of the present invention surrounds the pipe member 3 supported by the support member 21 from the outside, and the support member 21 that supports the pipe member 3 around which the covering material 2 is wound. And an outer mold 22 composed of a plurality of divided mold members 31... That is movable in a direction approaching and separating from the tube material 3, and the tube material 3 supported by the support member 21. The covering material 2 is integrally attached to the outer peripheral surface of the tube material 3 by pressing the divided mold material 31 of the outer mold 22 in several times over the entire circumference of the covering material 2. Then, when each of the divided mold members 31... Is pressed each time, the pressing portion of each time is partially overlapped while being shifted in the circumferential direction along the outer peripheral surface of the tube material 3.

  Specifically, the outer mold 22 is divided into four in the circumferential direction, and among the four pieces of divided mold materials 31..., A pair of opposed divided mold materials 31, 31 and a remaining pair of opposed divided mold materials 31, 31 are arranged. By pressing against the covering material 2 alternately, the end portions of the pressed portions are overlapped with each other while shifting the pressed portions in the circumferential direction along the outer peripheral surface of the tube material 3.

  Further, the pressing surfaces 32 of the divided mold members 31... Have a central angle of 90 degrees or more around the tube axis of the tube material 3 when the divided mold members 31 are pressed against the covering material 2. It is formed in an arc shape.

  Further, the tubular material 3 has a spiral convex portion 10 formed on the outer peripheral surface thereof, and a spiral concave portion into which the convex portion 10 of the tubular material 3 is fitted on the pressing surface 32 of each divided mold member 31. 33... Are formed. The support member 21 is made of a core material that externally fixes the tube material 3.

  The attachment device 51 of another invention is capable of being inserted into the inside of the tube member 53 supported by the support member 71 that supports the tube member 53 around which the covering member 52 is wound around the inner peripheral surface, An inner mold 81 composed of a plurality of divided mold members 82... That can move in a direction approaching and separating from the tube material 53, and is provided around the entire circumference of the covering material 52 of the tube material 53 supported by the support member 71. The covering material 52 is integrally attached to the inner peripheral surface of the pipe material 53 by pressing the divided mold members 82... Of the inner mold 81 in several times. In each pressing of the mold member 82..., Each pressing portion is partially overlapped while being shifted in the circumferential direction along the inner peripheral surface of the pipe member 53.

  Specifically, the inner mold 81 is divided into three in the circumferential direction, and while the three-piece divided mold material 82... Is pressed against the covering material 52 several times at the same time, the three-piece divided mold material 82. The tube material 53 is rotated by a predetermined angle about the tube axis, and the end portions of the pressed portions are overlapped with each other while shifting the pressed portions in the circumferential direction along the inner peripheral surface of the tube material 53. Yes.

  Further, the pressing surfaces 83 of the divided mold members 82... Have a central angle of 60 degrees or more around the tube axis of the tube material 53 when the divided mold members 82 are pressed against the covering material 52. It is formed in an arc shape.

  Further, the tubular material 53 is formed with a spiral concave portion 56 on its inner peripheral surface, and a spiral convex portion that fits into the concave portion 56 of the tubular material 53 is formed on the pressing surface 83 of each divided mold member 82. 84 is formed.

  Further, the split mold members 82... Of the inner mold 81 are inserted into the tube 53 while being cantilevered, and the split mold members 82 of the inner mold 81 are pressed against the covering material 52. Sometimes, a pressing member 72 is provided which is inserted between the free ends of the split mold members 82 of the inner mold 81 and presses the free end sides of the split mold members 82 to the covering material 52. Further, the support member 71 is made of a frame material with an insertion hole 70 for inserting and fixing the tube material 53.

  When using the attachment device of the present invention, when the divided mold material of the outer mold is pressed in several times over the entire circumference of the covering material of the pipe material, the pressing part of each time is partially overlapped while being shifted in the circumferential direction. Therefore, it is possible to eliminate the conventional sticking failure such that the covering material swells in a protruding shape at the boundary part of each divided mold material, and the covering material is tightly attached to the entire outer peripheral surface of the already formed pipe material. It can be attached with a uniform thickness with good accuracy.

  Further, the outer mold is constituted by a four-piece split mold material, and a pair of opposing split mold materials is taken as one pair, and a total of two pairs of split mold materials are pressed against the cover material alternately, thereby sandwiching the coating material from the outside by the split mold material In this way, it can be pressed in a well-balanced manner, and the covering material can be more reliably and accurately attached.

  Furthermore, even if the outer peripheral surface of the tubular material has a spiral shape by forming a spiral concave portion into which the convex portion formed on the outer peripheral surface of the tubular material fits on the pressing surface of the split mold material, the spiral shape is exactly aligned. It is possible to attach the covering material.

  In addition, by fitting and fixing the tube material to the core material, the tube material can be supported in a stable state while suppressing the inclination and deformation of the tube material when pressed from the outside of the outer mold, and the covering material can be supported more securely. It can be reliably attached with high accuracy.

  When the mounting device of another invention is used, when the divided mold material of the inner mold is pressed in several times over the entire circumference of the covering material of the pipe material, the overlapping part is partially overlapped while shifting the pressing part of each time in the circumferential direction. As a result, it is possible to eliminate the conventional sticking failure such that the covering material swells in a protruding shape at the boundary portion of each divided mold material, and the covering material is applied to the entire inner peripheral surface of the already formed tube material. It can be attached with high accuracy with uniform thickness while keeping it tight.

  In addition, the inner mold is composed of a three-piece split mold material, and the three-piece split mold material is divided into several times and pressed against the covering material at the same time. The covering material can be attached more reliably and accurately.

  Furthermore, even if the inner peripheral surface of the tubular material has a spiral shape by forming a spiral convex portion that fits into the concave portion formed on the inner peripheral surface of the tube material on the pressing surface of the split mold material, the spiral shape is tight The covering material can be attached along with

  Furthermore, by inserting a pressing member between the free ends of the inner molds that are cantilevered and pressing the free ends of the divided molds against the covering material, the freedom of the divided molds that tend to be weakened The pressing force on the end side can be increased to make the covering material attached at both ends of the tube uniform.

  In addition, by inserting and fixing the tube material in the insertion hole of the frame material, the tube material can be supported in a stable state while suppressing inclination and deformation of the tube material when pressed from the inside of the inner mold. The material can be attached more reliably and accurately.

(First embodiment)
1 and 2 show a pipe joint (pipe material) 3 in which a water-absorbing expandable nonwoven fabric (coating material) 2 for water stop is integrally attached by a mounting device 1 according to the first embodiment of the present invention. Yes.

  As shown in FIGS. 4 and 5, the pipe joint 3 is for connecting a pipe port member 5 embedded in the hand hole 4 and an underground buried type cable protection pipe 6 through which an electric wire or an optical fiber cable is inserted. is there. This pipe joint 3 is formed by blow molding, and as shown in FIG. 3, a small-diameter first connection cylinder portion 11 having a spiral convex portion 10 formed on the outer peripheral surface, and a retainer on the inner peripheral surface. A large-diameter second connecting cylinder portion 13 in which the material 12 is fitted is continuous in the tube axis direction. The pipe port member 5 includes a connection end portion 16 having a spiral recess 15 formed on the inner peripheral surface, and the cable protection tube 6 includes a connection end portion 18 having a packing 17 fitted on the outer peripheral surface. .

  Moreover, as shown in FIG.1 and FIG.2, the sheet-like water-swellable nonwoven fabric 2 is integrally affixed on the outer peripheral surface of the 1st connection cylinder part 11 of this pipe joint 3 over the perimeter. ing. The water-absorbing expandable nonwoven fabric 2 is a synthetic resin nonwoven fabric containing a highly water-absorbing polymer excellent in water absorption and water retention, for example, and has the ability to absorb water and expand.

  Then, the first connection tube portion 11 of the pipe joint 3 is screwed into the connection end portion 16 of the pipe port member 5 and the connection end portion 18 of the cable protection tube 6 is inserted into the second connection tube portion 13 of the pipe joint 3. By connecting, the pipe port member 5 and the cable protection pipe 6 are connected via the pipe joint 3 as shown in FIG. In this connection state, the water-absorbable expandable nonwoven fabric 2 is interposed between the first connection tube portion 11 of the pipe joint 3 and the connection end portion 16 of the pipe port member 5, and the water-absorbable expandable nonwoven fabric 2 is underground. By absorbing the moisture and expanding, the gap generated at the connecting portion between the pipe joint 3 and the pipe port member 5 is closed to ensure good water blocking. Further, a packing 17 is interposed between the second connecting cylinder portion 13 of the pipe joint 3 and the connection end portion 18 of the cable protection tube 6, and a gap generated at a connection portion between the pipe joint 3 and the cable protection tube 6 is formed. Good water-stopping is ensured by blocking.

  FIG. 6 shows an attachment device 1 for integrally attaching the water-swellable non-woven fabric 2 to the outer peripheral surface of the first connecting tube portion 11 of the pipe joint 3. The attachment device 1 includes a core member (support member) 21 that is fixed on a base 20 and on which a pipe joint 3 that is temporarily fixed by winding a water-absorbable non-woven fabric 2 is fixed. An outer mold 22 that is arranged so as to surround the fitted and fixed pipe joint 3 from the outside and is movable in the direction of approaching and separating from the core material 21 and the pipe joint 3 is fixed on the base 20. And a pneumatic cylinder 23 for moving the outer mold 22. The driving means for moving the outer mold 22 is not limited to the pneumatic cylinder, and may be a hydraulic cylinder or a driving motor, for example.

  As shown in FIG. 7, the core member 21 is fixed to the shaft member 25 erected on the base 20, a lid member 27 secured to the upper end portion of the shaft member 25 with screws 26, and the upper end portion of the shaft member 25. Then, the first connecting tube portion 11 and the second connecting tube of the pipe joint 3 are fixed to the core member 28 on which the first connecting tube portion 11 of the pipe joint 3 is fitted and the intermediate portion of the shaft member 25. The base member 29 on which the step part between the parts 13 is placed and the receiving member 30 which is fixed to the lower end part of the shaft member 25 and receives the second connecting cylinder part 13 of the pipe joint 3 are provided.

  As shown in FIG. 8, the outer mold 22 is divided into four in the circumferential direction along the outer peripheral surface of the pipe joint 3 that is fitted and fixed to the core member 21. That is, the outer mold 22 is composed of four-piece divided mold materials 31 of the same shape. These four-piece split mold members 31 can be heated by a heater (not shown), and pneumatic cylinders 23 are connected to each other, and the pneumatic cylinders 23 are extended to split mold members 31. , The pressing surface 32... Which is the inner peripheral surface of the split mold material 31... Is pressed against the water absorbent expandable nonwoven fabric 2 wound around the pipe joint 3, and the water absorbent expandable nonwoven fabric 2 is heated and compressed. ing. The heaters and pneumatic cylinders 23 are driven by a microcomputer (not shown).

  The pressing surfaces 32 of the split mold members 31 have a central angle of 90 degrees or more when the split mold members 31 are pressed against the water-absorbent expandable nonwoven fabric 2 and more specifically 90 degrees or more. Is formed in an arc shape in plan view that is approximately 120 degrees. That is, the sum of the center angles of the pressing surfaces 32 of the divided mold members 31 is set to be 360 degrees or more. Then, as shown in FIG. 7, the pressing surfaces 32... Are respectively formed with spiral concave portions 33 corresponding to the convex portions 10 of the first connecting cylinder portion 11 of the pipe joint 3. When the mold material 31... Is pressed against the water-absorbable expandable nonwoven fabric 2, the convex portion 10 of the first connecting tube portion 11 of the pipe joint 3 is fitted into the concave portion 33 of the pressing surface 32.

  Next, the operation | movement when sticking the water absorptive nonwoven fabric 2 integrally on the outer peripheral surface of the 1st connection cylinder part 11 of the pipe joint 3 using the attachment apparatus 1 of the said structure is demonstrated. First, using the pipe joint 3 after cooling formed by blow molding, the end portions of the sheet-like water-swellable non-woven fabric 2 are superposed on the outer peripheral surface of the first connecting tube portion 11 of the pipe joint 3. Wrap and temporarily fix. In this case, an adhesive is applied to one side of the water-swellable non-woven fabric 2, and the one side with the adhesive is wound while adhering to the outer peripheral surface of the first connecting cylinder part 11.

  Subsequently, the pipe joint 3 on which the water-swellable nonwoven fabric 2 is wound and temporarily fixed is externally fitted and fixed to the core member 21 of the attachment device 1 (see FIGS. 7 and 8). In this state, the split mold material 31 of the outer mold 22 heated to 150 ° C. or more by the heater is selectively moved by the expansion and contraction of the pneumatic cylinder 23, and the pressing surfaces 32 are expanded and absorbed by water. The water-absorbent non-woven fabric 2 that has been temporarily fixed is used as a paste by melting the adhesive of the water-absorbent non-woven fabric 2 by several times over the entire circumference of the water-soluble non-woven fabric 2 and using the adhesive as a paste. Affixed integrally to the outer peripheral surface of the connecting cylinder part 11.

  That is, first, the pressing surfaces 32 and 32 of the pair of split mold members 31 and 31 facing in the left-right direction among the four pieces of split mold members 31 are pressed against the water-absorbent non-woven fabric 2 (see FIG. 9 and FIG. 10). The left and right sides of the expandable nonwoven fabric 2 are heated and compressed over a total range of about 240 degrees centering on the tube axis of the pipe joint 3, and after a predetermined time has passed, the pair of split mold members 31, 31 are combined with the water absorbent expandable nonwoven fabric 2. (First heat pressing step). Subsequently, the pressing surfaces 32 and 32 of the pair of split mold members 31 and 31 facing in the front-rear direction are pressed against the water absorbent expandable nonwoven fabric 2 (see FIG. 11), and the front and rear sides of the water absorbent expandable nonwoven fabric 2 are connected to the pipe joint 3. The total of about 240 degrees centering on the tube axis is heated and compressed, and after a predetermined time has passed, the pair of split mold members 31 and 31 are separated from the water-absorbent expandable nonwoven fabric 2 (second heat pressing step).

  When such a first hot pressing step and a second hot pressing step are completed, pressing is performed over the entire circumference of the water-absorbing expandable nonwoven fabric 2, and the pressing surface 32 of the split mold material 31. A total of four regions (a range of about 30 degrees around the pipe axis of the pipe joint 3) where the pressing (overlap) is performed twice by the end of (2) are generated (see FIG. 12). Conventionally, these regions are the boundary portions of the divided mold material that are easily lifted up by the edges of the divided mold material, and are likely to rise up into a protruding shape. Such a region is expanded by being heated and compressed twice. The sticking defect of the conductive nonwoven fabric 2 can be eliminated.

  In addition, after the first hot press process and the second hot press process are completed, the first hot press process may be additionally performed, or the first hot press process and the second hot press process are repeated several times. In this way, the water-swellable nonwoven fabric 2 may be more reliably attached. What is necessary is just to set suitably about the frequency | count of a setting according to the thickness, the diameter, etc. of the water absorptive expandable nonwoven fabric 2 and the pipe joint 3. FIG.

  In this way, in the mounting device 1 described above, the four-piece split mold material 31... Is pressed into the water-absorbent non-woven fabric 2 in several times, specifically, the four-piece split mold material 31. The pair of split mold members 31, 31 and the remaining pair of opposing split mold members 31, 31 are alternately pressed against the water-absorbent inflatable nonwoven fabric 2, and the pressing portion of each time is shifted in the circumferential direction along the outer peripheral surface of the pipe joint 3. The ends of these pressing parts are overlapped with each other. Accordingly, it is possible to eliminate the conventional sticking failure in which the water-swellable non-woven fabric 2 swells in a protruding shape at the boundary portion between the divided mold members 31... And the first connecting tube portion of the pipe joint 3 that has already been formed. 11. The water-swellable non-woven fabric 2 can be adhered to the entire circumference of the outer peripheral surface 11 with a uniform thickness with good precision.

  In the above-described embodiment, an example in which the outer mold 22 including the four-piece split mold material 31 is used has been described, but the present invention is not limited thereto. For example, using an outer mold composed of three-piece, five-piece or more divided mold materials, these divided mold materials are pressed in several times over the entire circumference of the water-absorbent expandable nonwoven fabric, and each pressing portion is shifted in the circumferential direction. You may make it overlap partially.

  In addition, when the divided mold material of the outer mold is pressed each time, the outer mold or the pipe joint is rotated around the tube axis so that the pressing portion of each time is partially overlapped while being shifted in the circumferential direction. May be. In this case, the central angle of the pressing surface of the split mold material (the central angle centered on the pipe axis of the pipe joint when the split mold material is pressed against the water-absorbable non-woven fabric) need not be set to a total of 360 degrees or more. Become. For this reason, it is possible to use an outer mold made of a two-piece split mold.

(Second Embodiment)
13 and 14 show a pipe joint (pipe material) 53 in which a water-absorbing expandable nonwoven fabric (coating material) 52 for water stop is integrally attached by a mounting device 51 according to the second embodiment of the present invention. Yes.

  As shown in FIG. 15, the pipe joint 53 is for connecting the underground buried type cable protection pipes 54, 54 through which an electric wire or an optical fiber cable is inserted. The pipe joint 53 is formed by blow molding, and is formed of a spiral corrugated pipe in which a spiral convex portion 55 is formed on the outer peripheral surface and a spiral concave portion 56 is formed on the inner peripheral surface. The cable protection tubes 54 and 54 are also formed of a spiral corrugated tube in which spiral irregularities are formed on the inner and outer peripheral surfaces.

  Moreover, as shown in FIG.13 and FIG.14, the sheet-like water-swellable nonwoven fabric 52 is affixed integrally on the inner peripheral surface of this pipe joint 53 over the perimeter. The water-absorbent expandable nonwoven fabric 52 is, for example, a synthetic resin nonwoven fabric containing a highly water-absorbing polymer excellent in water absorption and water retention, and has the ability to absorb water and expand.

  Then, the end portions of the cable protection tubes 54, 54 are screwed into the both ends of the tube joint 3 to be internally fitted, so that the cable protection tubes 54, 54 are connected to each other via the tube joint 53 as shown in FIG. 15. It has come to be. In this connected state, a water-swellable non-woven fabric 52 is interposed between the pipe joint 3 and the cable protection tubes 54 and 54, and the water-swellable non-woven fabric 52 absorbs moisture in the ground and expands. A good water-stopping property is ensured by closing a gap generated at the connection portion between the pipe joint 53 and the cable protection pipes 54 and 54.

  16 to 19 show an attachment device 51 for integrally attaching the water-swellable nonwoven fabric 52 to the inner peripheral surface of the pipe joint 53. In this attachment device 51, two sets of rail members 61 and 62 are attached on a base 60. One rail member 61 includes a pair of shafts 61a and 61a parallel to each other, and is disposed along the front-rear direction. The other rail member 62 includes a pair of shafts 62a and 62a that are parallel to each other, and is disposed along the left-right direction. That is, the rail members 61 and 62 are arranged in directions orthogonal to each other.

  A first movable base 63 that is slidable along the rail member 61 is attached to one rail member 61, and a first movable base 63 that is slidable along the rail member 62 is attached to the other rail member 62. Two movable stands 64 are attached. In addition, the 1st movable stand 63 and the 2nd movable stand 64 are moved by drive means, such as a pneumatic or hydraulic cylinder which is not shown in figure, and a drive motor.

  On the first movable stand 63, as shown in FIG. 20, a frame member (supporting member) with an insertion hole 70 for inserting and fixing the pipe joint 53 temporarily wound around the inner peripheral surface by winding the water-absorbing expandable nonwoven fabric 52. Member) 71 and a pressing member 72 that can be inserted into and removed from the insertion hole 70 of the frame member 71 are provided. The pressing member 72 includes a shaft portion 75 supported by a pair of bearings 74, 74 on the first movable base 63, and an insertion portion 76 having a tapered surface attached to the distal end portion of the shaft portion 75. These are moved in the left-right direction by driving means such as pneumatic or hydraulic cylinders or drive motors (not shown).

  On the second movable stand 64, a case 80 having a pneumatic or hydraulic cylinder, a drive motor and other driving means (not shown) is installed, and is cantilevered by the case 80, and is inserted into the insertion hole 70 of the frame member 71. An inner mold 81 that can be inserted inside the fixed pipe joint 53 is provided.

  As shown in FIG. 21, the inner mold 81 is divided into three in the circumferential direction along the inner peripheral surface of the pipe joint 53 that is inserted and fixed in the insertion hole 70 of the frame member 71. That is, the inner mold 81 is composed of three-piece divided mold members 82 of the same shape. These three-piece split mold members 82... Can be heated by a heater (not shown), and the driving means in the case 80 are connected to each other so as to move simultaneously in the direction of approaching and separating from the inner peripheral surface of the pipe joint 53. The pipe shaft of the pipe joint 53 in a state where the entire inner mold 81 can be enlarged / reduced and is separated from the inner peripheral surface of the pipe joint 53 (the whole inner mold 81 is reduced in diameter). , And can be simultaneously moved in the pipe axis direction of the pipe joint 53 in a state of being separated from the inner peripheral surface of the pipe joint 53 (in a state where the entire inner mold 81 is reduced in diameter). . Although the detailed operation will be described later, the divided mold members 82... Are appropriately moved and rotated while appropriately moving and rotating the first movable table 63 and the second movable table 64, the pressing member 72, and the inner mold 81. Are pressed against a water-absorbent expandable nonwoven fabric 52 wound around the inner peripheral surface of the pipe joint 53, and the water-absorbable expandable nonwoven fabric 52 is heated and compressed. The driving of each driving means of the first movable base 63 and the second movable base 64, the pressing member 72, and the inner mold 81 is controlled by a microcomputer (not shown).

  The pressing surfaces 83 of the split mold members 82... Have a central angle of 60 degrees or more when the split mold members 82. Is formed in an arc shape in a side view of about 70 degrees. Further, as shown in FIG. 20, spiral pressing portions 84 corresponding to the concave portions 56 on the inner peripheral surface of the pipe joint 53 are formed on the pressing surfaces 83. Is pressed against the water-absorbable expandable nonwoven fabric 52, and the convex portion 84 of the pressing surface 83 is fitted into the concave portion 56 of the pipe joint 53.

  Next, an operation when the water-swellable non-woven fabric 52 is integrally attached to the inner peripheral surface of the pipe joint 53 using the mounting device 51 having the above configuration will be described. First, a blow-molded pipe joint 53 is used to superpose two sheet-like water-swellable non-woven fabrics 52 on the inner peripheral surface on one end side of the pipe joint 53. Wound and temporarily fixed to the inner peripheral surface on the other end side in the same manner, and wound and temporarily fixed the sheet-like water-swellable nonwoven fabric 52 divided into two pieces so that the ends overlap each other To do. In this case, an adhesive is applied to one side of each of the water-absorbing expandable nonwoven fabrics 52, and the one side with the adhesive is wound while adhering to the inner peripheral surface of the pipe joint 53. When temporarily fixing the water-swellable non-woven fabric 52, one end of the water-swellable non-woven fabric 52 is used at both ends of the inner peripheral surface of the pipe joint 53 so that the ends overlap each other. However, by using the water absorbent expandable nonwoven fabric 52 divided as described above, it is possible to wind the water absorbent expandable nonwoven fabric 52 along the spiral shape of the inner peripheral surface of the pipe joint 53. it can.

  Subsequently, the pipe joint 53 that is temporarily fixed by winding the water-swellable non-woven fabric 52 is inserted into the insertion hole 70 of the frame member 71 of the attachment device 51 and fixed. The attachment device 51 at this time is in the state shown in FIG. 16 and can fix the pipe joint 53 without interfering with the inner mold 81. After the pipe joint 53 is set on the frame member 71, the first movable base 63 and the second movable base 64 are moved, and the inner mold 81, the pipe joint 53, and the pressing member 72 are arranged in a straight line, and the inner mold 81 is inserted inside the pipe joint 53 (see FIGS. 17 and 21). In this state, the split mold members 82 of the inner mold 81 heated to 150 ° C. or more by the heater are appropriately moved and rotated, and the pressing surfaces 83 are simultaneously numbered over the entire circumference of the water-swellable non-woven fabric 52. The water-swellable non-woven fabric 52 that has been temporarily fixed is integrally attached to the inner peripheral surface of the pipe joint 53 while being pressed and divided and used as a paste by melting the adhesive of the water-swellable non-woven fabric 52.

  That is, first, the inner mold 81 is expanded in diameter, and the pressing surfaces 83 of the divided mold members 82 are simultaneously pressed against the water-absorbent expandable nonwoven fabric 52 (see FIGS. 18, 22, and 23). Heat compression is performed over a total range of about 210 degrees around the pipe axis of the pipe joint 53, and after a predetermined time has passed, the inner mold 81 is reduced in diameter to separate the split mold member 82 from the water-absorbent expandable nonwoven fabric 52. (First heat pressing step). Subsequently, the split mold members 82 are rotated about 60 degrees around the pipe axis of the pipe joint 53, and the split mold members 82 are moved in the pipe axis direction of the pipe joint 53 to press the split mold members 82. Alignment of the convex portions 84 of the surfaces 83 and the concave portions 56 of the pipe joint 53 is performed. From this state, the diameter of the inner mold 81 is expanded again, and the pressing surfaces 83 of the split mold members 82 are simultaneously pressed against the water-absorbent expandable nonwoven fabric 52 (see FIG. 24). Heat compression is performed over a total range of about 210 degrees around the tube axis, and after a predetermined time has passed, the inner mold 81 is reduced in diameter to separate the split mold material 82. Hot press process).

  When such a first heat pressing step and a second heat pressing step are completed, pressing is performed over the entire circumference of the water-absorbent expandable nonwoven fabric 52, and the expandable nonwoven fabric 52 is pressed against the pressing surfaces 83 of the split mold members 82. A total of 6 areas (range of about 10 degrees centering on the pipe axis of the pipe joint 53) are generated (overlap) twice by the end of (2) (see FIG. 25). Conventionally, these regions are the boundary portions of the divided mold material that are easily lifted up by the edges of the divided mold material, and are likely to rise up into a protruding shape. Such a region is expanded by being heated and compressed twice. Sticking failure of the conductive nonwoven fabric 52 can be eliminated.

  In addition, after the completion of the first hot pressing step and the second hot pressing step, the first hot pressing step and the second hot pressing step are further repeated several times so that the water-absorbing expandable nonwoven fabric 52 is further adhered. You can be sure. What is necessary is just to set suitably about the frequency | count of a setting according to the thickness, the diameter, etc. of the water absorptive non-woven fabric 52 and the pipe joint 53.

  Further, in the middle of the first hot press process and the second hot press process, the pressing member 72 is used to assist the pressing of the split mold material 82.. Process).

  That is, in the first hot pressing process and the second hot pressing process, the split mold member 82 in a cantilevered state is pressed against the water-absorbable non-woven fabric 52. The pressure may be weaker than the pressing force on the base end side. For this reason, in the hot press auxiliary process, when the split mold member 82 is pressed against the water-absorbent non-woven fabric 52 in the first hot press process or the second hot press process, The insertion part 76 of the pressing member 72 is inserted between the free ends of the divided mold members 82... Inserted into the water, so that the free end side of the divided mold members 82. (See FIGS. 19, 26, 27, and 28). Thereby, the sticking condition of the water-swellable nonwoven fabric 52 at both ends of the pipe joint 53 is made uniform. In addition, what is necessary is just to set the timing and frequency | count of a hot press auxiliary | assistant process suitably according to the thickness, the diameter, etc. of the water absorptive nonwoven fabric 52 and the pipe joint 53. FIG.

  In this way, in the mounting device 51 described above, while the three-piece split mold member 82 is simultaneously pressed into the water-absorbent non-woven fabric 52 in several times, the split mold member 82. The ends of the pressed portions are overlapped with each other while being rotated at a predetermined angle as the center and shifting the pressed portions in the circumferential direction along the inner peripheral surface of the pipe joint 53. Accordingly, it is possible to eliminate the conventional sticking failure such that the water-swellable non-woven fabric 52 swells in a protruding shape at the boundary portion between the divided mold members 82... And the entire inner peripheral surface of the pipe joint 53 that has already been formed. In addition, the water-swellable non-woven fabric 52 can be attached with a uniform thickness with good accuracy while being closely aligned.

  In the above-described embodiment, an example in which the inner mold 81 including the three-piece divided mold material 82 is used has been described. However, the present invention is not limited to this. For example, using an inner mold composed of a split mold material of 2 pieces or 4 pieces or more, these split mold materials are pressed several times over the entire circumference of the water-swellable non-woven fabric, and each pressing portion is shifted in the circumferential direction. You may make it overlap partially.

  In addition, when the divided mold material of the inner mold is pressed each time, the pipe joint is rotated by a predetermined angle around the tube axis so that the pressing portion of each time is partially overlapped while being shifted in the circumferential direction. good.

  The present invention is not limited to the above embodiment, and it is needless to say that many modifications and changes can be made to the above embodiment within the scope of the present invention. For example, the pipe material to which the covering material is attached using the attachment device of the present invention is not limited to a pipe joint for connecting a cable protection pipe, and is not limited to a duct hose or pipe, a water supply / drain hose or pipe, fluid, food, etc. Various pipe materials such as a transport hose, a pipe, and a cleaner hose may be used. Moreover, the outer peripheral surface and inner peripheral surface of the tube material in which the annular convex portion and the concave portion are formed, or not only the covering material is attached to the outer peripheral surface and inner peripheral surface of the pipe material in which the spiral convex portion and the concave portion are formed, or The covering material may be attached to the outer peripheral surface or the inner peripheral surface of the straight cylindrical tube material. Furthermore, the covering material to be attached to the tube material is not limited to the water-absorbing expandable nonwoven fabric, and may be various covering materials for protecting the tube material or enhancing the sound absorption property or heat insulation property of the tube material.

It is a front view of the pipe joint which affixed the water absorptive nonwoven fabric with the attachment apparatus which concerns on 1st Embodiment of this invention. It is the side view similarly. It is a front view of the pipe joint before sticking a water-absorbing expandable nonwoven fabric. It is a longitudinal cross-sectional view which decomposes | disassembles and shows the usage example of a pipe joint. It is a longitudinal cross-sectional view which shows the usage example of a pipe joint. It is a schematic plan view of an attachment apparatus. It is a longitudinal cross-sectional view of the core material vicinity of an attachment apparatus. It is a schematic plan view which shows the state which set the pipe joint in the attachment apparatus. It is a schematic plan view which shows the state of a 1st hot press process. It is a longitudinal cross-sectional view which shows the state of a 1st hot press process. It is a schematic plan view which shows the state of a 2nd hot press process. It is a figure which shows the pressing range of a division | segmentation die material. It is a longitudinal cross-sectional view of the pipe joint which affixed the water absorptive expandable nonwoven fabric with the attachment apparatus which concerns on 2nd Embodiment of this invention. It is the side view similarly. It is a longitudinal cross-sectional view which shows the usage example of a pipe joint. It is a schematic plan view of an attachment apparatus. It is a schematic plan view which shows the operation | movement middle of an attachment apparatus. It is a schematic plan view which shows the operation | movement middle of an attachment apparatus. It is a schematic plan view which shows the operation | movement middle of an attachment apparatus. It is a cross-sectional view which shows the state which inserted the inner metal mold | die inside the pipe joint fixed to the frame material. It is a side view which shows the state which inserted the inner metal mold | die inside the pipe joint fixed to the frame material. It is a side view which shows the state of a 1st hot press process. It is a cross-sectional view which shows the state of a 1st hot press process. It is a side view which shows the state of a 2nd hot press process. It is a figure which shows the pressing range of a division | segmentation die material. It is a side view which shows the state of a hot press auxiliary | assistant process. It is a side view which shows the state of a hot press auxiliary | assistant process. It is a cross-sectional view which shows the state of a hot press auxiliary | assistant process.

  1 ・ ・ Mounting device 2 ・ ・ Water-absorbing expandable non-woven fabric (coating material) 3 ・ ・ Pipe joint (pipe material) 10 ・ ・ Convex portion of pipe material 21 ・ ・ Core material (support member) 22 ・ ・ Outer metal Mold 31 .. Split mold material 32.. Pressing surface 33.. Recessed part of split mold material 51.. Mounting device 52.. Water-absorbing expandable nonwoven fabric (coating material) 53 53 Pipe fitting (pipe material) 56 ..Concavity of tube material, 70..Insertion hole, 71..Frame material (support member), 72..Pressing member, 81..Inner mold, 82..Division mold material, 83..Pressing surface, 84 .. Convex part of split mold

Claims (11)

A support member (21) for supporting the tube material (3) wound around the outer peripheral surface of the covering material (2), and the tube material (3) supported by the support member (21) are arranged so as to surround from the outside, An outer mold (22) made up of a plurality of divided mold members (31) that are movable in a direction approaching and separating from the tube material (3), and supported by the support member (21). A covering material (2) of the pipe material (3) is pressed several times over the entire circumference of the outer mold (22) to divide the covering material (2) into the pipe material (2). 3) An attachment device (1) which is integrally attached to the outer peripheral surface of 3), and the pressing portion of each time is applied to the outer peripheral surface of the pipe member (3) when the divided mold member (31) is pressed each time. So as to partially overlap while shifting in the circumferential direction along Mounting device of the dressing to the tubing, characterized in that the. The outer mold (22) is divided into four in the circumferential direction, and among these four-piece divided mold members (31),..., A pair of opposed divided mold materials (31) (31) and a remaining pair of opposed divided mold materials ( 31) (31) is alternately pressed against the covering material (2), and the end portions of the pressing portions are overlapped with each other while shifting the pressing portions in the circumferential direction along the outer peripheral surface of the pipe material (3). The apparatus for attaching a covering material to a pipe material according to claim 1, wherein The pressing surfaces (32) of the divided mold members (31) are centered on the tube axis of the pipe material (3) when the divided mold materials (31) are pressed against the covering material (2). The apparatus for attaching a covering material to a pipe according to claim 2, wherein the device is formed in an arc shape having a central angle of 90 degrees or more. The tubular material (3) has a spiral convex portion (10) formed on its outer peripheral surface, and the convex portion of the tubular material (3) is formed on the pressing surface (32) of each divided mold member (31). The apparatus for attaching a covering material to a pipe material according to any one of claims 1 to 3, wherein a helical recess (33), into which (10) is fitted, is formed. The said supporting member (21) is an attachment apparatus of the coating | covering material to the pipe material in any one of Claim 1 thru | or 4 which consists of a core material which carries out external fitting fixation of the said pipe material (3). A support member (71) that supports a pipe member (53) wound around an inner peripheral surface of a covering member (52), and can be inserted inside the pipe member (53) supported by the support member (71). An inner mold (81) made up of a plurality of divided mold members (82) made movable in a direction approaching and separating from the tube material (53), and supported by the support member (71). The covering material (52) of the pipe material (53) is pressed several times over the entire circumference of the inner mold (81) to divide the covering material (52) into the pipe material (52). 53) is an attachment device (51) that is integrally attached to the inner peripheral surface of the pipe member (53), wherein the divided portion (82)... Partially overlap while shifting in the circumferential direction along the surface Dressing of the mounting device to the tubing, characterized in that so as to flop. The inner mold (81) is divided into three in the circumferential direction, and the three-piece divided mold member (82) is pressed against the covering member (52) several times at the same time. .. Alternatively, the pipes (53) are rotated by a predetermined angle about the pipe axis, and the respective pressing parts are shifted in the circumferential direction along the inner peripheral surface of the pipes (53) while the ends of the pressing parts are The apparatus for attaching a covering material to a pipe material according to claim 6, wherein the two are overlapped with each other. The pressing surfaces (83) of each of the divided mold members (82) are centered on the tube axis of the tube material (53) when the divided mold members (82) are pressed against the covering material (52). The apparatus for attaching a covering material to a pipe according to claim 7, wherein the device is formed in an arc shape having a central angle of 60 degrees or more. The tubular material (53) is formed with a spiral recess (56) on its inner peripheral surface, and the pressing surface (83) of each divided mold member (82) is provided with a recess ( 56. The apparatus for attaching a covering material to a pipe material according to any one of claims 6 to 8, wherein a spiral convex portion (84) is formed to fit into the pipe material. The split mold members (82) of the inner mold (81) are inserted into the pipe member (53) in a cantilevered state, and the split mold members (82) of the inner mold (81) are inserted. Is pressed between the free ends of the split mold members (82) of the inner mold (81), and the free end sides of the split mold members (82). The apparatus for attaching a covering material to a pipe according to any one of claims 6 to 9, further comprising a pressing member (72) for pressing the covering material (52). The said support member (71) consists of a frame material with the insertion hole (70) which inserts and fixes the said pipe material (53), The attachment apparatus of the coating | covering material to the pipe material in any one of Claim 6 thru | or 10.