JP2009279907A - Attachment device of coating material to pipe material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an attachment device for precisely attaching a coating material such as nonwoven fabric by closely fitting along the inner peripheral surface of a previously formed pipe material, a square cylindrical part in particular. <P>SOLUTION: This attachment device 1 includes: a supporting member 34 supporting a pipe material 3 having square cylindrical parts 5; and two sets of inner molds 50 and 51, having dividable mold materials 52-54 and 55-57, respectively, which can be inserted into or drawn out of inside the square cylindrical parts 5 of the pipe material 3 supported by the supporting member 34, and can be moved in the approaching or departing directions with respect to the inner peripheral surface of the square cylindrical parts 5. When the dividable mold materials 52-54 and 55-57 of the inner molds 50 and 51 are alternately enforced to the coating material 2 tentatively stretched in a square frame shape along the inner peripheral surface of the square cylindrical parts 5 of the pipe material 3, the end parts of the enforcing sites are made overlapped each other while the enforcing sites are shifted each time circumferentially along the inner peripheral surface of the square cylindrical parts 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an attachment device for integrally attaching a covering material such as a non-woven fabric for water stop to an inner peripheral surface of various types of pipes and pipe joints having a rectangular tube-shaped portion. About.

  In general, as a pipe joint for connecting cable protection pipes, one having a water-absorbing expandable non-woven fabric for water stop attached to its inner peripheral surface 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 attach the nonwoven fabric precisely along the inner peripheral surface thereof with high precision. If there is a sticking failure, a large force is required to connect the pipe joint to the cable protection tube, and the nonwoven fabric is wrinkled and twisted, resulting in a thin-walled portion. It will be difficult to ensure.

  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. At times, a method of crimping a non-woven fabric on the 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 the inner peripheral surface of a pipe joint that has already been formed, the non-woven fabric is attached to the inner surface of the pipe joint with a mold inserted inside the pipe joint. A method of pressing against the inner peripheral surface is employed. The mold used at this time is generally a halved or quadrant that is a combination of split mold materials, and these split mold materials are closed and reduced in diameter and inserted inside the pipe joint. The nonwoven fabric is pressed by opening the split mold material and expanding the diameter. However, when the nonwoven fabric is pressed with such a mold, when the split mold material is opened, a gap is generated between the adjacent split mold materials, and a portion where the split mold material cannot be pressed is partially generated. In the vicinity of the portion where the edge portion of the split mold material comes into contact, the nonwoven fabric was lifted up and raised, and irregularities were sometimes generated on the nonwoven fabric surface.

  In addition, a method may be employed in which a nonwoven fabric is temporarily stretched on the inner peripheral surface of the pipe joint, and the nonwoven fabric is pressed by fitting while inserting a core inside the pipe joint. However, in this case, if the core is tightly fitted, the nonwoven fabric will be wrinkled or twisted due to frictional resistance between the core and the nonwoven fabric, and if the core is loosely fitted, the nonwoven fabric will be pressed firmly. There was a problem that it was not possible.

  As described above, conventionally, a technique for accurately attaching a nonwoven fabric to the inner peripheral surface of a pipe joint that has already been molded has not been sufficiently established. In particular, in recent years, cable protection tubes having a rectangular tube-shaped portion in consideration of installation stability are commercially available, and the connecting end portion is a rectangular tube shape as a pipe joint for connecting this type of cable protection tube to each other. Although there are some, the actual situation is that no consideration has been given to the attachment of the nonwoven fabric to the inner peripheral surface of the rectangular tube-shaped portion in such a pipe joint.

  In view of this, the present invention eliminates the above-mentioned problems and accurately places a covering material such as a non-woven fabric on the inner peripheral surface of a tubular part such as a tube or a pipe joint that has already been formed, in particular with high accuracy. An object of the present invention is to provide a device for attaching a covering material to a pipe material that can be attached.

  In order to solve the above-described problem, the attachment device 1 of the present invention includes a support member 34 that supports the tube material 3 including the square tube-shaped portion 5, and the square tube-shaped portion 5 of the tube material 3 that is supported by the support member 34. One or more having a plurality of divided mold members 52 to 54 and 55 to 57 that can be inserted / removed with respect to the inner side and can be moved in a direction of approaching and separating from the inner peripheral surface of the rectangular tube-shaped portion 5. The inner molds 50 and 51, and the divided mold material 52 of the inner molds 50 and 51 over the entire circumference of the covering material 2 that is temporarily stretched in a rectangular frame shape along the inner peripheral surface of the rectangular tube-shaped portion 5. The attachment device 1 is configured to integrally attach the covering material 2 to the inner peripheral surface of the rectangular tube-shaped portion 5 by pressing .about.54, 55 to 57 in several times. ˜54, 55˜57, each time of pressing, the pressing part of each time While shifting the circumferential direction along the circumferential surface, characterized in that the ends of their pressing portion so as to overlap each other.

  Specifically, two sets of inner molds 50 and 51 are provided, and the divided mold members 52 to 54 and 55 to 57 of the inner molds 50 and 51 are alternately pressed against the covering material 2.

  Further, by rotating or moving the support member 34, it is possible to insert / remove the split mold members 52 to 54 of one inner mold 50 into the rectangular tubular portion 5 of the tube material 3 supported by the support member 34. It is possible to switch between a state in which the split mold members 55 to 57 of the other inner mold 51 can be inserted and removed.

  Further, one of the two sets of inner molds 50, 51 includes a first split mold member 52 having a pressing surface 60 a that presses the first side 2 a of the covering member 2, and the covering member 2. The second side 2b that is substantially orthogonal to the first side 2a and the corner between the third side 2c and the second side 2b facing the first side 2a are pressed. A second split mold member 53 having a surface 61a, a fourth side part 2d substantially orthogonal to the first side part 2a of the covering material 2, and a third side part 2c facing the first side part 2a. And the third divided mold member 54 having a pressing surface 62a that presses the corner portion between the second side portion 2d and the other inner mold 51 is pressed against the third side portion 2c of the covering material 2 A fourth split mold member 55 having a surface 63a, a second side 2b of the covering member 2, and A fifth divided mold member 56 having a pressing surface 64a for pressing a corner portion between the first side portion 2a and the second side portion 2b, a fourth side portion 2d of the covering material 2, and a first side portion 2a; And a sixth split mold member 57 having a pressing surface 65a that presses a corner portion between the fourth side portion 2d and the fourth side portion 2d.

  Furthermore, the split mold members 52 to 54 of the one inner mold 50 and the split mold members 55 to 57 of the other inner mold 51 have the same shape and size, and their positional relationship is upside down or left and right. The reverse is true.

  In addition, a set of inner molds 50 is provided, and the inner mold 50 or the support member 34 is rotated, so that the pressing portion of each of the divided mold members 52 to 54 of the inner mold 50 is changed to the square cylindrical part. 5 is shifted in the circumferential direction along the inner circumferential surface.

  Further, the support member 34 is composed of a frame with an insertion hole 35 for inserting and fixing the tube material 3.

  When using the mounting device of the present invention, when the divided mold material of the inner mold is pressed into the covering material temporarily stretched on the inner peripheral surface of the rectangular tube-shaped portion of the tube in several times, the pressing portion of each time is in the shape of a rectangular tube. Since the end portions of the pressing parts are overlapped with each other while shifting in the circumferential direction along the inner peripheral surface of the part, the divided mold material can be surely pressed without gaps over the entire circumference of the covering material. Thus, it is possible to attach the covering material to the entire inner peripheral surface of the rectangular tube-shaped portion of the already formed tube material with a uniform thickness and with high accuracy while eliminating the above-described poor attachment.

  In addition, by using two sets of inner molds, the divided mold materials of these inner molds are alternately inserted and pressed inside the rectangular tube-shaped portion, and are pressed several times using one set of inner molds. As in the case, for example, it is possible to eliminate the need for a drive mechanism or drive control that rotates the inner mold around its central axis at each pressing.

  In addition, two sets of inner molds are prepared by making the split mold material of one inner mold and the split mold material of the other inner mold the same shape and size, with different specifications only. In doing so, it is only necessary to produce two sets of the same thing, and the mold cost can be reduced.

  On the other hand, if one set of inner molds is used to perform the pressing while shifting the pressing part of each time of the divided mold material in the circumferential direction, the above drive mechanism and drive control are necessary, The mold cost can be greatly reduced.

  Furthermore, by inserting and fixing the tube material in the insertion hole of the support member, 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.

  Embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 show a pipe joint (pipe material) 3 made of a synthetic resin, in which a water-absorbing expandable nonwoven fabric (covering material) 2 for water stop is integrally attached by a mounting device 1 according to an embodiment of the present invention. Is shown.

  The pipe joint 3 is for connecting the cable protection pipes 4 and 4 made of underground buried synthetic resin through which an electric wire or an optical fiber cable is inserted. This pipe joint 3 is formed by blow molding, and has a structure in which a rectangular tubular portion 5 as a female connecting portion and a cylindrical portion 6 as a male connecting portion are continuous in the tube axis direction. Yes. The rectangular tube-shaped portion 5 has a substantially square cross section in the tube diameter direction, a flange portion 7 is formed over the entire circumference in the vicinity of the opening end, and a diameter in the vicinity of the center in the tube axis direction. A bulging portion 8 bulging outward is formed over the entire circumference. In addition, a pair of metal retaining pieces 9 and 9 are attached to the inner peripheral surface of the rectangular tube-shaped part 5 so as to face each other on the opening end side with respect to the bulging part 8, and are deeper than the bulging part 8. On the side, a sheet-like water-swellable non-woven fabric 2 is integrally attached over the entire circumference. 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. The cylindrical portion 6 is formed in a substantially circular cross section in the tube radial direction, and a flange portion 11 having an inclined guide surface on the outer periphery is formed in the vicinity of the opening end of the cylindrical portion 6 along the tube axis direction. A plurality of bulging portions 12... Bulging outward in a radial direction are formed over the entire circumference. An annular packing 13 is fitted on the outer peripheral surface of the cylindrical portion 6 in a recess between the bulging portions 12 and 12.

  On the other hand, as shown in FIG. 3, the cable protection tube 4 includes a convex portion 20 with a substantially square cross section in the tube radial direction and a concave portion 21 with a substantially circular cross section in the tube radial direction. Are provided alternately with the wall 25. A female adapter 22 is integrally formed at one end of the tube wall 25, and a male adapter 23 is integrally formed at the other end. Then, the female adapter 22 is externally fitted to the male adapter 23 of another cable protective tube 4, and the male adapter 23 is internally fitted to the female adapter 22 of another cable protective tube 4, so that the cable protective tube is fitted. 4 ... are added and piped.

  The cable protection pipes 4... Are piped between the hand holes. However, if a fixed length pipe is added, the length between the hand holes may not match the length of the cable protection pipes 4. Therefore, as shown in FIG. 4, the pipe wall 25 of an arbitrary cable protection pipe 4 is cut while adjusting the length, and the male adapter 23 side is cut off, and the square end of the pipe joint 3 is cut at the cut end. The part 5 is fitted outside, and the cylindrical part 6 of the pipe joint 3 is fitted into the female adapter 22 of the other cable protection pipe 4 to connect the cable protection pipes 4, 4 to each other via the pipe joint 3. By doing so, the total length of the cable protection tube 4 can be adjusted to match the length between the hand holes. In this connected state, the retaining pieces 9 and 9 on the side of the rectangular tubular portion 5 of the pipe joint 3 are engaged with the convex portion 20 of the cable protection tube 4 that is cut, and the cable protection tube 4 is prevented from coming off. Yes. Further, the water-swellable non-woven fabric 2 is interposed between the rectangular tube-shaped portion 5 of the pipe joint 3 and the projecting portion 20 of the cut cable protection tube 4, and the water-swellable non-woven fabric 2 absorbs moisture in the ground. By absorbing and expanding, the gap formed in the connecting portion between the pipe joint 3 and the cut cable protection pipe 4 is closed, and good water stoppage is ensured. Further, a packing 13 is interposed between the cylindrical portion 6 of the pipe joint 3 and the female adapter 22 of the other cable protection pipe 4, and is generated at a connection portion between the pipe joint 3 and the other cable protection pipe 4. Good water stoppage is ensured by closing the gap.

  5 and 6 show an attachment device 1 for integrally attaching the water-swellable nonwoven fabric 2 along the inner peripheral surface of the rectangular tube-shaped portion 5 of the pipe joint 3 as described above. The mounting device 1 includes a fixed base 31 fixed on the base 30 and a pair of left and right rail members 32 and 32 fixed on the base 30 with the fixed base 31 interposed therebetween.

  A vertical axis 33 is erected on the fixing base 31 so as to be rotatable, and a support member 34 that supports the pipe joint 3 is fixed to an upper end portion of the vertical axis 33. The support member 34 is formed of a frame body having an insertion hole 35 for inserting and fixing the pipe joint 3, and the vertical axis 33 is driven by a driving means such as a pneumatic or hydraulic cylinder (not shown) attached to the fixing base 31 or a driving motor. Is rotated horizontally around the vertical axis 33. Then, by horizontally rotating the support member 34, the open end of the rectangular tube-shaped portion 5 of the pipe joint 3 supported by the support member 34 is opposed to one inner mold 50 to be described later. The state is switched to the state facing the other inner mold 51.

  The rail members 32, 32 are composed of a pair of shafts 32a, 32a arranged in parallel in the left-right direction. The movable bases 40, 40 are slidably attached to the rail members 32, 32, respectively. These movable bases 40, 40 move by the expansion and contraction of pneumatic cylinders 41, 41 attached on the base 30. The driving means for moving the movable bases 40, 40 is not limited to the pneumatic cylinders 41, 41, but may be a hydraulic cylinder, a drive motor, or the like.

  On the movable bases 40, 40, mounting plates 42, 42 are erected so as to face each other, and support bases 43, 44 are respectively provided on these mounting plates 42, 42 so as to face each other. It is fixed.

  On one side (left side in FIGS. 5 and 6), as shown in FIG. 7, the support base 43 includes a substantially cylindrical base portion 45 and three projecting portions 46, projecting from the outer peripheral surface of the base portion 45. I have. The base 45 protrudes from the mounting plate 42 so that the central axis thereof is parallel to the rail member 32. The three protrusions 46 are provided at equal intervals in the circumferential direction of the base 45 and project radially outward from the outer peripheral surface of the base 45 about the central axis of the base 45. Specifically, one protrusion 46 protrudes directly from the outer peripheral surface of the base 45, and the remaining two protrusions 46 and 46 protrude obliquely downward from the outer peripheral surface of the base 45. . The three protrusions 46 are formed with guide grooves 47 extending in the protruding direction, that is, the radially outward direction of the base 45, and slide members 48 are slid along the guide grooves 47, respectively. It is attached. Note that a driving means such as a pneumatic or hydraulic cylinder (not shown) or a driving motor for moving the slide member 48.

  As shown in FIG. 10, the other support base 44 (right side in FIGS. 5 and 6) includes a base 45, three protrusions 46, and a slide member 48, as in the case of the one support base 43. The central axis of the base 45 is arranged on the central axis of the base 45 in the one support base 43, and the three protrusions 46. Thus, the positional relationship is point-symmetric about the central axis of the base 45. That is, one protrusion 46 protrudes right below from the outer peripheral surface of the base 45, and the remaining two protrusions 46 and 46 protrude obliquely upward from the outer peripheral surface of the base 45.

  The inner molds 50 and 51 are cantilevered on the left and right support bases 43 and 44 so as to face each other. These inner molds 50 and 51 are for pressing the water-absorbable non-woven fabric 2 temporarily stretched in a rectangular frame shape along the inner peripheral surface of the rectangular tube-shaped portion 5 in the pipe joint 3 supported by the support member 34. It is.

  As shown in FIG. 7, the inner mold 50 on one side (left side in FIGS. 5 and 6) is a three-piece first to third divided mold material attached to the slide material 48 of the one support base 43, respectively. 52, 53, 54 are provided. These split mold members 52, 53, 54 can be heated by a heater (not shown), and in a state where the open end of the rectangular tubular portion 5 of the pipe joint 3 supported by the support member 34 is opposed to the inner mold 50, By sliding one movable base 40, it is possible to insert and remove at the same time with respect to the inside of the rectangular tube-shaped portion 5, and in the state where it is inserted inside the rectangular tube-shaped portion 5, the slide member 48 is slid. Thus, it is possible to simultaneously move in the direction of approaching and separating from the inner peripheral surface of the rectangular tubular portion 5 (the entire inner mold 50 can be enlarged / reduced in diameter). In addition, the insertion / removal of the split mold members 52, 53, 54 with respect to the inside of the rectangular tubular portion 5 is performed so that the split mold members 52, 53, 54 do not interfere with the water-absorbent non-woven fabric 2. Is performed in a state of being separated from each other (the state in which the entire inner mold 50 has a reduced diameter).

  Of the split mold members 52, 53, and 54, the first split mold member 52 extends rightward from the slide member 48 toward the support member 34, and a first block body 60 is provided at the tip thereof. As shown in FIGS. 8 and 9, the first block body 60 is formed in a substantially rectangular parallelepiped shape, and has a pressing surface 60 a that presses the first side portion (upper side portion) 2 a of the rectangular frame-like water-absorbent expandable nonwoven fabric 2. Have.

  The second divided mold member 53 extends rightward from the slide member 48 toward the support member 34, and a second block body 61 is provided at the tip thereof. As shown in FIGS. 8 and 9, the second block body 61 is formed in a substantially rectangular parallelepiped shape with one corner portion being curved, and is formed on the first side portion 2 a of the water absorbent expandable nonwoven fabric 2 having a square frame shape. The second side part (side part) 2b that is substantially orthogonal to the first side part 2a, and the corner part between the third side part (lower side part) 2c that faces the first side part 2a and the second side part 2b. It has a pressing surface 61a for pressing.

  The third divided mold member 54 extends rightward from the slide member 48 toward the support member 34, and a third block body 62 is provided at the tip thereof. As shown in FIGS. 8 and 9, the third block body 62 is formed in a substantially rectangular parallelepiped shape with one corner portion being curved, and is formed on the first side portion 2 a of the water absorbent expandable nonwoven fabric 2 having a rectangular frame shape. It has a pressing surface 62a that presses a fourth side (side side) 2d that is substantially orthogonal to the second side and a corner between the third side 2c and the fourth side 2d.

  The other inner mold 51 (on the right side in FIGS. 5 and 6) has a three-piece fourth to sixth divided mold material attached to the slide material 48 of the other support base 44 as shown in FIG. 10. 55, 56, 57. These divided mold members 55, 56, 57 can be heated by a heater (not shown), and in a state where the open end of the rectangular tubular portion 5 of the pipe joint 3 supported by the support member 34 is opposed to the inner mold 51, By sliding the other movable base 40, it is possible to insert / remove at the same time with respect to the inside of the rectangular tube-shaped portion 5, and in the state of being inserted inside the rectangular tube-shaped portion 5, the slide member 48 is slid. Thus, it can be moved simultaneously in the direction of approaching and separating from the inner peripheral surface of the rectangular tube-shaped portion 5 (the entire inner mold 51 can be enlarged / reduced in diameter). In addition, the insertion / removal of the split mold members 55, 56, 57 with respect to the inside of the rectangular tube-shaped portion 5 is performed so that the split mold materials 55, 56, 57 do not interfere with the water-absorbent expandable nonwoven fabric 2. Are performed in a state of being separated from each other (the state in which the entire inner mold 51 is reduced in diameter).

  Of the divided mold members 55, 56, and 57, the fourth divided mold member 55 has the same shape and size as the first divided mold member 52, and extends leftward from the slide member 48 toward the support member 34. A fourth block body 63 is provided at the tip. As shown in FIGS. 11 and 12, the fourth block body 63 is formed in a substantially rectangular parallelepiped shape, and has a pressing surface 63 a that presses the third side portion 2 c of the rectangular frame-shaped water-absorbent expandable nonwoven fabric 2. .

  The fifth divided mold member 56 has the same shape and size as the third divided mold member 54, extends leftward from the slide member 48 toward the support member 34, and a fifth block body 64 is provided at the tip thereof. It has been. As shown in FIGS. 11 and 12, the fifth block body 64 is formed in a substantially rectangular parallelepiped shape with one corner portion being curved, and the second side portion 2 b of the water absorbent expandable nonwoven fabric 2 having a rectangular frame shape, And it has the pressing surface 64a which presses the corner part between the 1st edge part 2a and the 2nd edge part 2b.

  The sixth divided mold member 57 has the same shape and size as the second divided mold member 53, extends leftward from the slide member 48 toward the support member 34, and a sixth block body 65 is provided at the tip thereof. It has been. As shown in FIGS. 11 and 12, the sixth block body 65 is formed in a substantially rectangular parallelepiped shape with one corner portion being curved, and the fourth side portion 2d of the water absorbing / expandable nonwoven fabric 2 having a square frame shape, And it has the pressing surface 65a which presses the corner part between the 1st edge part 2a and the 4th edge part 2d.

  The pressing surfaces 60a to 65a of the divided mold members 52 to 57 in the inner molds 50 and 51 are formed corresponding to the inner peripheral surface shape of the rectangular tubular portion 5 of the pipe joint 3, as shown in FIG. In addition, the end portions of the pressing portions by the pressing surfaces 60a to 65a overlap each other in the region D ··. Further, the split mold members 52, 53, and 54 of one inner mold 50 and the split mold members 55, 56, and 57 of the other inner mold 51 are point-symmetrical, specifically, upside down positional relations. The shape and size are the same. Therefore, when preparing both the inner dies 50 and 51, it is only necessary to manufacture two sets of the same one, and the die cost can be reduced. In addition, when the corner part of the water absorbing expandable nonwoven fabric 2 having a rectangular frame shape is not a round shape as shown in the figure but is substantially a right angle, the pressing surface 61a of the divided mold members 53, 54, 56, 57 is used. , 62a, 64a, 65a may be formed to have a substantially right angle.

  In the mounting apparatus 1 having the above-described configuration, the driving of the driving means for the support member 34, the movable bases 40 and 40, and the slide member 48 is controlled by a microcomputer (not shown).

  Next, the operation when the water-swellable nonwoven fabric 2 is integrally attached to the inner peripheral surface of the rectangular tube-shaped portion 5 in the pipe joint 3 using the mounting device 1 having the above configuration will be described. First, using a blow-formed pipe joint 3 that has been blown, two sheets of water-absorbent expandable nonwoven fabric 2 are polymerized on the inner peripheral surface of the rectangular tube-shaped part 5 of the pipe joint 3 at their ends. Affix to make a square frame. 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 pasted while adhering to the inner peripheral surface of the pipe joint 3. In addition, when the water-swellable nonwoven fabric 2 is temporarily stretched, a single sheet-like water-swellable nonwoven fabric 2 may be used so that the ends thereof are polymerized. By using the water-swellable non-woven fabric 2 divided in this way, the water-swellable non-woven fabric 2 can be attached while being well aligned with the inner peripheral surface of the rectangular tubular portion 5.

  Subsequently, the pipe joint 3 in which the water-swellable non-woven fabric 2 is temporarily stretched into a rectangular frame shape along the inner peripheral surface of the rectangular tubular portion 5 is inserted into the insertion hole 35 of the support member 34 of the attachment device 1 and attached. . At this time, as shown in FIG. 14, the support member 34 is arranged so that the insertion hole 35 extends along the front-rear direction, and thereby the pipe joint 3 can be inserted in the front-rear direction, and the inner mold 50 , 51 can be installed without interfering with the pipe joint 3.

  Then, after the pipe joint 3 is set on the support member 34, the support member 34 rotates, so that the rectangular tubular portion 5 of the pipe joint 3 supported by the support member 34 is separated from the inner mold 50. Switch to a state in which 52, 53, and 54 can be inserted and removed. That is, the support member 34 rotates about 90 degrees about the vertical axis 33 so that the open end of the rectangular tube-shaped portion 5 of the pipe joint 3 faces the one inner mold 50. In this state, as shown in FIGS. 8 and 15, when one movable base 40 moves to the right, the split mold members 52, 53, and 54 heated to a predetermined temperature by the heater are formed into a rectangular tube shape of the pipe joint 3. Insert inside part 5. Then, as the slide member 48 of the one support base 43 slides in the radially outward direction, the split mold members 52, 53, and 54 are moved with respect to the inner peripheral surface of the rectangular tubular portion 5 as shown in FIG. The inner mold 50 as a whole is moved in the approaching direction to increase the diameter, and the pressing surfaces 60a, 61a, 62a of the divided mold members 52, 53, 54 are simultaneously pressed against the water-absorbent expandable nonwoven fabric 2 and heated and compressed. Thereby, in the site | part which pressed the pressing surfaces 60a, 61a, 62a, melt | dissolving the adhesive of the water absorptive expandable nonwoven fabric 2, and using the water-swellable non-woven fabric 2 temporarily stretched as the paste of the square tubular part 5 Affixed integrally on the inner peripheral surface (first hot pressing step).

  After the elapse of a predetermined time, the slide members 48 of the one support base 43 slide in the radially inward direction, so that the divided mold members 52, 53, 54 are separated from the inner peripheral surface of the rectangular tubular portion 5. The entire inner mold 50 is moved to reduce the diameter, and the pressing surfaces 60a, 61a, 62a of the divided mold members 52, 53, 54 are simultaneously separated from the water-absorbent expandable nonwoven fabric 2, and one movable base 40 is moved in the left direction. By moving, the split mold members 52, 53, 54 are extracted from the inside of the rectangular tube-shaped part 5 of the pipe joint 3.

  Subsequently, by rotating the support member 34, the split mold members 55, 56, 57 of the other inner mold 51 can be inserted into and removed from the rectangular tubular portion 5 of the pipe joint 3 supported by the support member 34. Switch to state. That is, the support member 34 rotates about 180 degrees horizontally about the vertical axis 33, and the open end of the rectangular tubular portion 5 of the pipe joint 3 is opposed to the other inner mold 51. In this state, as shown in FIGS. 11 and 16, the other movable base 40 moves leftward so that the divided mold members 55, 56, and 57 heated to a predetermined temperature by the heater are shaped like a rectangular tube of the pipe joint 3. Insert inside part 5. Then, as the slide member 48 of the other support base 44 slides in the radially outward direction, the split mold members 55, 56, 57 are moved with respect to the inner peripheral surface of the rectangular tubular portion 5 as shown in FIG. The inner mold 51 is enlarged in diameter by moving in the approaching direction, and the pressing surfaces 63a, 64a, 65a of the divided mold members 55, 56, 57 are simultaneously pressed against the water-absorbent expandable nonwoven fabric 2 and compressed by heating. Thereby, in the site | part which pressed the pressing surfaces 63a, 64a, 65a, melt | dissolving the adhesive of the water absorptive expandable nonwoven fabric 2, and using the water-swellable non-woven fabric 2 temporarily stretched as the paste, Affixed integrally to the inner peripheral surface (second hot pressing step).

  After the elapse of a predetermined time, the slide members 48 of the other support base 44 slide in the radially inward direction, so that the divided mold members 55, 56, 57 are separated from the inner peripheral surface of the rectangular tubular portion 5. The inner mold 51 is moved to reduce the diameter, and the pressing surfaces 63a, 64a, 65a of the split mold members 55, 56, 57 are simultaneously separated from the water-absorbent inflatable nonwoven fabric 2, and the other movable base 40 is moved in the right direction. By moving, the split mold members 55, 56, and 57 are extracted from the inside of the rectangular tubular portion 5 of the pipe joint 3. In addition, after this 2nd hot press process is completed, the support member 34 rotates about 90 degree | times centering on the vertical axis | shaft 33, and the opening end of the square cylindrical part 5 of the pipe joint 3 is orient | assigned to the front or back. In this state, by pulling out the pipe joint 3 in the front-rear direction, the pipe joint 3 can be removed without interfering with the inner molds 50 and 51.

  Thus, in said attachment apparatus 1, the heat compression by the inner metal mold | dies 50 and 51 is uneven over the perimeter of the water absorptive expandable nonwoven fabric 2 by performing a 1st hot press process and a 2nd hot press process. Therefore, the entire circumference of the water-absorbent expandable nonwoven fabric 2 can be attached with a uniform thickness along the shape of the inner peripheral surface of the rectangular tube-shaped portion 5 with high accuracy. That is, with respect to the expandable nonwoven fabric 2 temporarily stretched on the inner peripheral surface of the rectangular tube-shaped portion 5, the split mold materials 52, 53, 54 of one inner mold 50 and the split mold materials 55, 56 of the other inner mold 51 are used. , 57 are alternately pressed, and when the divided mold members 52 to 54 and 55 to 57 are pressed each time, the pressing portions are shifted while being shifted in the circumferential direction along the inner peripheral surface of the rectangular tubular portion 5. As shown in FIG. 13, the water-absorbent expandable nonwoven fabric 2 has a total of six regions D .. that are pressed twice. These regions D ·· are boundary portions between the divided mold members 52, 53, 54 of one inner mold 50 and the divided mold members 55, 56, 57 of the other inner mold 51. By pressing over the degree, the split mold members 52 to 54 and 55 to 57 can be surely pressed without gaps over the entire circumference of the water-absorbent expandable nonwoven fabric 2. Accordingly, the water-swellable non-woven fabric 2 is formed in a flat state without unevenness by eliminating the lifting of the water-swellable non-woven fabric 2 by the edge portions of the split mold members 52 to 54 and 55 to 57. Can be pasted with high accuracy.

  In addition, after 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 to further stick the water-absorbing expandable nonwoven fabric 2. 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 expandable nonwoven fabric 2 and the pipe joint 3. FIG.

  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 the pipe joint having a structure in which the rectangular tube portion and the cylindrical portion are continuous in the tube axis direction as in the above embodiment. 17, a pipe joint having a structure in which a pair of rectangular tubular portions 5, 5 are continuous in the tube axis direction, or a rectangular tubular portion 5 and a spiral corrugated tubular portion 70 as shown in FIG. It may be a pipe joint having a structure that is continuous in the axial direction. Furthermore, the present invention is not limited to pipe joints, and may be various pipe materials such as cable protection pipes, duct hoses and pipes, water supply / drainage hoses and pipes, transport hoses and pipes for foods, cleaner hoses and pipes, and the like. Furthermore, the covering material to be attached to the pipe material is not limited to the water-swellable non-woven fabric, and may be various covering materials for protecting the pipe material and enhancing the sound absorption property and heat insulating property of the pipe material.

  In the above embodiment, an example is shown in which two sets of inner molds are arranged to face each other with a support member interposed therebetween, but two sets of inner molds may be arranged side by side in parallel with each other. In this case, the support member is moved, or the inner mold is moved, so that the rectangular tubular portion of the tube material supported by the support member can be inserted into and removed from the split mold material of one inner mold. And a state in which the split mold member of the other inner mold can be inserted and removed.

  Furthermore, in the said embodiment, although the example which comprised the divided mold material of 2 sets of inner molds by making the shape and size the same and making the positional relationship upside down was shown, the positional relationship is shown. May be reversed, and the shape and size of the split mold members of the two sets of inner molds may be different from each other.

  Furthermore, in the above-described embodiment, an example in which the divided mold members of two sets of inner molds are pressed against the covering material in several times has been shown. However, as shown in FIGS. 19 and 20, a set of inner molds is pressed. 50, the divided mold members 52, 53, 54 of the inner mold 50 may be pressed against the covering material 2 in several times. In this case, when the divided mold members 52, 53, and 54 are pressed each time, the divided mold members 52, 53, and 54 are rotated by rotating the inner mold 50 (which may be the support member 34) 180 degrees around the horizontal axis. Is turned upside down, and each pressing portion is partially overlapped while being shifted in the circumferential direction along the inner peripheral surface of the rectangular tubular portion 5. In order to rotate the inner mold 50 around the horizontal axis, the base portion 45 of the support base 43 is rotatably supported with respect to the mounting plate 42, and the base portion 45 is rotated by a drive motor and a drive transmission mechanism (not shown). You can do that. Other configurations and operational effects are the same as those of the above-described embodiment. In FIGS. 19 and 20, members having the same functions as those of the above-described embodiment are denoted by the same reference numerals.

  Moreover, in the said embodiment, although the inner metal mold | die consists of a split piece material of 3 pieces, it may consist of a split mold material of 2 pieces or 4 pieces or more, for example.

It is a perspective view of the pipe joint which affixed the water absorptive expandable nonwoven fabric with the attachment apparatus which concerns on one Embodiment of this invention. It is the same front view. It is a side view of a cable protection tube. It is a partially broken side view which shows the usage example of a pipe joint. It is a schematic front view of an attachment apparatus. It is a schematic plan view of an attachment apparatus. It is a perspective view of one inner metal mold | die. It is a figure which shows the state which inserted one inner metal mold | die inside the square cylindrical part of a pipe joint. It is a figure which shows the pressing state by one inner metal mold | die. It is a perspective view of the other inner metal mold | die. It is a figure which shows the state which inserted the other inner metal mold | die inside the square cylindrical part of the pipe joint. It is a figure which shows the pressing state by the other inner metal mold | die. It is a figure which shows the pressing site | part of the split mold material of both inner molds. It is a schematic plan view of the attachment apparatus in the state where the pipe joint is set on the support member. It is a schematic plan view of the attachment apparatus at the time of a 1st hot press process execution. It is a schematic plan view of the attachment apparatus at the time of 2nd hot press process execution. It is a perspective view of another pipe joint. It is a perspective view of another pipe joint. It is a schematic front view of an attachment apparatus when using 1 set of inner metal mold | dies. It is a schematic plan view of the attachment apparatus when using one set of inner molds.

  1 ・ ・ Mounting device 2 ・ ・ Water-absorbing expandable nonwoven fabric (covering material), 2a ・ ・ first side, 2b ・ ・ second side, 2c ・ ・ third side, 2d ・ ・ fourth side, 3 .... Fittings (pipe material), 5 .... Square tubular part, 34 ... Support member, 35 ... Insert hole, 50 ... One inner mold, 51 ... Other inner mold, 52 ... First divided mold material 53, second divided mold material 54, third divided mold material 55, fourth divided mold material 56, fifth divided mold material 57, sixth divided mold material 60a to 65a Pressing surface

Claims (7)

A support member (34) for supporting the tube (3) provided with the rectangular tube-shaped portion (5), and an inner side of the tube-shaped portion (5) of the tube material (3) supported by the support member (34). A plurality of divided mold members (52) to (54), (55) to (55) which are made removable and can be moved in a direction approaching and separating from the inner peripheral surface of the rectangular tube-shaped portion (5). 57) and one or a plurality of inner molds (50) (51), and a covering material (2) that is temporarily stretched in a rectangular frame shape along the inner peripheral surface of the rectangular tube-shaped portion (5) The divided mold members (52) to (54) and (55) to (57) of the inner molds (50) and (51) are pressed several times over the inner molds (50) and (51), so that the covering material (2) is An attachment device (1) that is integrally attached to the inner peripheral surface of the cylindrical portion (5), wherein the split mold members (52) to (54) and (55) to (57) At the time of pressing, the end portions of the pressing portions are overlapped with each other while shifting the pressing portions of the respective times in the circumferential direction along the inner peripheral surface of the rectangular tube-shaped portion (5). A device for attaching a coating to a pipe. Two sets of inner molds (50) and (51) are provided, and the divided mold members (52) to (54) and (55) to (57) of these inner molds (50) and (51) are used as the covering material (2). The apparatus for attaching a covering material to a pipe material according to claim 1, wherein the device is alternately pressed onto the pipe material. By rotating or moving the support member (34), the rectangular tubular portion (5) of the pipe member (3) supported by the support member (34) is divided into one of the inner molds (50). 3. A switchable state between (52) to (54) and a state in which the split mold members (55) to (57) of the other inner mold (51) can be inserted and removed. A device for attaching a covering material to a pipe material. One inner mold (50) of the two sets of inner molds (50) (51) has a pressing surface (60a) for pressing the first side (2a) of the covering material (2). The split mold material (52), the second side (2b) substantially orthogonal to the first side (2a) of the covering material (2), and the first side facing the first side (2a). A second split mold member (53) having a pressing surface (61a) for pressing a corner portion between the three side portions (2c) and the second side portion (2b), and a first side portion (2) of the covering material (2) ( 4a (2d) substantially orthogonal to 2a) and a corner between the third side (2c) and the fourth side (2d) facing the first side (2a) And a third split mold member (54) having a pressing surface (62a) for pressing the portion, and the other inner mold (51) is a third side portion of the covering member (2) ( c) a fourth split mold member (55) having a pressing surface (63a) for pressing, a second side portion (2b) of the covering material (2), a first side portion (2a) and a second side portion ( 2b), a fifth divided mold member (56) having a pressing surface (64a) for pressing the corner portion between the first side portion (2a) and the fourth side portion (2d) and the first side portion (2a) of the covering material (2). The apparatus for attaching a covering material to a pipe according to claim 2 or 3, comprising a sixth split mold member (57) having a pressing surface (65a) for pressing a corner portion between the first side portion and the fourth side portion (2d). The split mold members (52) to (54) of the one inner mold (50) and the split mold members (55) to (57) of the other inner mold (51) have the same shape and size, The apparatus for attaching a covering material to a pipe according to claim 4, wherein the positional relationship is upside down or left and right. A set of inner molds (50) is provided, and by rotating the inner mold (50) or the support member (34), the divided mold members (52) to (54) of the inner mold (50) are rotated. The apparatus for attaching a covering material to a pipe according to claim 1, wherein the pressing portion of each turn is shifted in the circumferential direction along the inner peripheral surface of the rectangular tube-shaped portion (5). The said support member (34) consists of a frame with an insertion hole (35) which inserts and fixes the said pipe material (3), The attachment apparatus of the coating material to the pipe material in any one of Claim 1 thru | or 6.