JP2015196111A - Joint pipe wire separation method, and wire separation device used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint pipe wire separation method with a good recycling rate, and a wire separation device used for the same.SOLUTION: The method includes: a step in which a joint pipe 20 includes a pipe body 21 and a wire 22 included in the inner peripheral face 21s side of the pipe body 21, and at a plurality of points of the pipe body 21 in circumferential direction, cuts 53 extending in the axis direction of the pipe body 21 are formed; and a step in which the inner peripheral face 21s of the pipe body 21 is increased in diameter outwards in radial direction, and the pipe body 21 is broken into a plurality of pieces in circumferential direction.

Description

  The present invention relates to a wire separation method for a joint pipe and a wire separation device used therefor.

  Conventionally, a synthetic resin pipe such as a polyethylene pipe is frequently used for water pipes, gas pipes and the like because they are excellent in durability, corrosion resistance and flexibility, and are lightweight and excellent in workability (workability). In addition, as a joint for connecting this kind of pipe material, it is possible to easily perform a joining operation without using an expensive tool, and there are many advantages such as high reliability and no variation in connection quality. A fitting joint (hereinafter referred to as an EF joint) is frequently used.

As an EF joint, for example, one in which a heating wire is incorporated in a spiral shape on the inner peripheral surface side of a polyethylene joint pipe is known. EF joints are widely used for gas pipes and the like because they are not corroded and are light and resistant to earthquakes.
When recycling the used waste material of such an EF joint, since polyethylene resin is pelletized and reused, it is necessary to separate into polyethylene resin and a heating wire.

  Conventionally, for example, a recycling method described in Patent Document 1 has been proposed as a technique for separating and recycling a waste EF joint into a polyethylene resin and a heating wire. In this recycling method, the EF joint is finely pulverized, and is separated into a crushed piece containing a heating wire and a crushed piece not containing a heating wire by water specific gravity difference sorting. And the crushing piece containing a heating wire is discarded as industrial waste, and the crushing piece which does not contain a heating wire is pelletized after drying, and is reused.

JP-A-9-155866

However, in the above-described method of crushing and separating the joint, the crushed pieces made only of the resin are collected and recycled, and the crushed pieces including the heating wire are discarded. Resin is contained also in the fragmented piece containing a heating wire, and this resin has been discarded now. Also, the heating wire contained in the resin has been discarded. Therefore, it is desired to further increase the recycling rate of the material forming the joint pipe.
Therefore, the present invention provides a wire separation method for a joint pipe and a wire separation device used therefor, which have a high recycling rate.

The present invention employs the following means in order to solve the above problems.
The wire separation method for a joint pipe according to the present invention includes a pipe body and a wire built in the inner peripheral surface side of the pipe body. A step of forming respective notches continuous in the axial direction, and a step of expanding the inner peripheral surface of the tubular body radially outward and breaking the tubular body into a plurality of circumferential directions. And
According to this configuration, when the diameter of the tubular body in which cut portions are formed at a plurality of locations in the circumferential direction is increased in the radially outward direction, the tubular body is torn along the cut portions and broken into a plurality of portions in the circumferential direction. Thereby, the wire built in the inner peripheral surface side can be separated from the tubular body.

The wire separation method for a joint pipe according to the present invention may further include a step of heating the joint pipe prior to the step of forming the cut portion.
With this configuration, when the diameter of the tubular body is increased, the resin and the wire forming the tubular body can be easily separated and the tubular body is easily torn.

In the step of breaking the tubular body, the present invention inserts the distal end side of the expanding member whose outer diameter gradually increases from the distal end toward the proximal end inside the tubular body, and the expanding member and the By pressing at least one of the joint pipes and pushing the expanding member into the tubular body, the inner peripheral surface of the tubular body may be expanded to break the tubular body into a plurality in the circumferential direction.
Thus, by pushing the expanding member whose outer diameter gradually increases from the distal end toward the proximal end, the inner peripheral surface of the tubular body can be easily and reliably expanded and broken.

Further, the present invention provides a wire separating device for use in any one of the above-described wire separating methods for a joint pipe, and an expanding member that gradually increases in outer diameter from the distal end toward the proximal end and is inserted inside the tubular body. And a pressing member that relatively pushes the expansion member into the tubular body.
According to such a wire separation device, the expanding member can be inserted into the inside of the tube, and the expanding member can be relatively pushed into the tube, whereby the tube can be broken at the cut portion.

  According to the wire separation method for a joint pipe and the wire separation apparatus used therefor according to the present invention, the continuous wire in the circumferential direction is separated from the pipe body, and it becomes easy to separate the wire and the resin forming the pipe body. . Therefore, the wire separation method for a joint pipe and the wire separation device used therefor according to the present invention have an effect that the recycling rate of the material forming the joint pipe can be further increased.

It is sectional drawing which shows the structure of the joint pipe used as the application object of the wire separation method of the joint pipe which concerns on the 1st Embodiment of this invention, and the wire separation apparatus used therefor. It is a figure which shows the external appearance of the joint pipe which is an application object of this invention, Comprising: (a) is a top view of a joint pipe, (b) is a front view of a joint pipe, (c) is a side view of a joint pipe. It is a figure which shows the process of isolate | separating the terminal of a joint pipe by the wire separation method of the joint pipe which concerns on the 1st Embodiment of this invention, (a) is a top view of a joint pipe, (b) is a front view of a joint pipe (C) is a side view of a joint pipe. It is a figure which shows the state which isolate | separated the terminal of the joint pipe by the wire separation method of the joint pipe concerning the 1st Embodiment of this invention, (a) is a top view of a joint pipe, (b) is a front view of a joint pipe (C) is a side view of a joint pipe. It is a figure showing composition of a wire separation device of a joint pipe concerning a 1st embodiment of the present invention. It is a figure which shows the state which has fractured | ruptured the joint pipe | tube with the wire separation apparatus of the joint pipe | tube which concerns on the 1st Embodiment of this invention. It is a figure which shows the state which fractured | ruptured the joint pipe | tube with the wire separation apparatus of the joint pipe | tube which concerns on the 1st Embodiment of this invention. It is a figure which shows the structure of the wire separator which concerns on 2nd Embodiment, (a) is sectional drawing which shows the structure of the wire separator in the state before fracture | rupturing a joint pipe, (b) fractured | ruptured the joint pipe It is sectional drawing which shows the structure of the wire separation apparatus in a state.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS A mode for carrying out a wire separation method for a joint pipe and a wire separation apparatus used therefor according to the present invention will be described below with reference to the accompanying drawings. However, the present invention is not limited only to these embodiments.

(First embodiment)
FIG. 1 is a cross-sectional view illustrating a configuration of a joint pipe 20 to which a wire separation method for a joint pipe 20 according to the first embodiment and a wire separation apparatus used therefor are applied. 2A and 2B are views showing the appearance of the joint pipe 20, where FIG. 2A is a plan view of the joint pipe 20, FIG. 2B is a front view of the joint pipe 20, and FIG. 2C is a side view of the joint pipe 20. .
As shown in FIG. 1, the joint pipe 20 is an electric fusion joint used for connecting two pipes 10, 10.

The pipe 10 connected by the joint pipe 20 is made of a resin such as polyethylene and has a circular cross section.
As shown in FIGS. 1 and 2, the joint pipe 20 is made of, for example, a thermoplastic resin such as polyethylene, and includes a cylindrical pipe body 21 as a whole, a heating wire (wire) 22, and a terminal 23. Yes.

  The tube body 21 has pipe insertion portions 21a and 21a. The pipe insertion portions 21 a are formed at both ends of the tube body 21 in the direction of the axis L <b> 1 and have an inner diameter corresponding to the outer diameter of the pipe 10.

  The heating wire 22 is made of a metal wire such as a nichrome wire or an iron chrome wire, and is spirally moved a plurality of times along the longitudinal direction of the inner peripheral surface 21s at a position near the inner peripheral surface 21s of the pipe insertion portions 21a and 21a. It is wound and embedded (built-in). Ends 22 a and 22 b of the heating wire 22 are led out from the outer peripheral surface of the tube body 21 and connected to the terminal 23.

The terminal 23 is connected to a power supply controller (not shown). When a current is supplied from the power supply controller via the terminal 23, the heating wire 22 generates heat.
In such a joint pipe 20, when the end portion 10 e of the pipe 10 is inserted into the pipe insertion portion 21 a, the heating wire 22 is energized to generate heat, whereby the inner peripheral surface 21 s of the pipe insertion portion 21 a and the pipe 10. The pipe insertion part 21a and the pipe 10 are melted in the vicinity of the interface with which the outer peripheral surface 10a is in contact, and these are fused together.

  Next, a wire separation method for recycling the joint pipe 20 as described above will be described. FIG. 3 is a diagram illustrating a process of separating the joint pipe terminals, (a) is a plan view of the joint pipe, (b) is a front view of the joint pipe, and (c) is a side view of the joint pipe. 4A and 4B are diagrams illustrating a state in which the terminals of the joint pipe are separated. FIG. 4A is a plan view of the joint pipe, FIG. 4B is a front view of the joint pipe, and FIG. 4C is a side view of the joint pipe.

(Separation of terminals)
First, the portion of the terminal 23 of the joint pipe 20 is separated.
As shown in FIG. 3, a tool 50 such as a trowel is used to separate the terminals 23. The tool 50 has a blade portion 51 at the tip, and the blade portion 51 breaks the resin 20j that forms the tube body 21, and the resin 23j that forms the terminal 23 as shown in FIG. Separated from the resin 20j to be formed. At this time, as shown in FIG. 4, the heating wire 22 is not broken, and the resin 23 j and the resin 20 j are connected via the heating wire 22.

  As shown in FIG. 3, the blade 51 has a circular section or a U-shaped section that is larger than the outer shape of the terminal 23 so that the terminal 23 can be separated from the tube body 21. The blade portion 51 may be driven from the outer peripheral side of the tube body 21 with a hammer or the like, but it is preferable to heat the blade portion 51 and melt the tube body 21. Further, the tube body 21 may be heated and the terminal 23 may be separated by the blade portion 51. Alternatively, a cylindrical hole saw having a circular cross section may be attached to the tip of the rotary tool, and the terminal 23 may be excised from the tube body 21.

(Formation process of notch)
Next, as shown in FIG. 4, a cut portion 53 is formed on the outer peripheral surface of the tube body 21. The cut portions 53 are preferably formed at a plurality of locations at intervals in the circumferential direction of the tube body 21. Each notch 53 is formed so as to be continuous in the axial direction of the tube body 21.
In order to form the notch 53, for example, a tool or a trowel having a sharp tip can be used. Also in this case, the cut portion 53 can be easily formed by heating at least one of the tool, the iron, and the tube body 21.

(Process to heat the joint pipe)
Next, the tube body 21 is preheated (heated). Preheating may be performed by applying thermal energy to the entire tube body 21 by an appropriate means such as a heater, hot air, or a heating furnace, or by energizing the heating wire 22. The preheating temperature is preferably a temperature at which the resin forming the tube body 21 is softened, for example, about 190 ° C.

(Process to break joint pipe)
Subsequently, the tube body 21 is broken. For this, for example, a breaking device (wire separation device) 60 as shown below can be used.
FIG. 5 is a diagram showing a configuration of the breaking device 60. FIG. 6 is a view showing a state in which the tubular body 21 is broken by the breaking device 60. FIG. 7 is a view showing a state in which the tubular body 21 is broken by the breaking device 60.
As shown in FIG. 5, the breaking device 60 includes an expanding member 62 provided on a base 61 and a pressing member 63.

The expanding member 62 is formed in a truncated cone shape whose outer diameter gradually increases from one end (upper in the drawing) to the other end (lower in the drawing). The expanding member 62 is formed such that the outer diameter of the distal end 62 a is smaller than the inner diameter of the joint pipe 20, and the outer diameter of the proximal end 62 b is larger than the inner diameter of the tube body 21.
Moreover, it is preferable that the length H1 from the front-end | tip 62a to the base end 62b is set larger than the length H2 of the axial direction of the joint pipe | tube 20 so that the expansion member 62 may penetrate the pipe body 21. .

  A columnar reduced diameter portion 64 having an outer diameter smaller than that of the base end 62b is continuously formed below the base end 62b of the expanding member 62. As a result, an annular recess 65 that is recessed radially inward is formed between the base end 62 b of the spreading member 62 and the upper surface of the base 61 below it.

The pressing member 63 is disposed above the expanding member 62 and is provided so as to move up and down by a driving source such as a hydraulic cylinder (not shown). The pressing member 63 has its lower end surface 63a abutted against the upper end portion of the joint pipe 20 attached to the expanding member 62 as will be described later, and pressurizes the tube body 21 downward by a driving source.
In this embodiment, the pressing member 63 has a cylindrical shape, and the inner diameter thereof is set to be larger than the outer diameter of the tip 62 a of the expanding member 62.

  The joint pipe 20 is inserted into the outer peripheral side of the expanding member 62 with respect to such a breaking device 60. Then, the joint pipe 20 is held by the expanding member 62 in a state where the inner peripheral surface of the lower end portion 20a abuts against the outer peripheral surface of the frustoconical expanding member 62. In this state, the pressing member 63 is retracted upward.

Next, the pressing member 63 is lowered, and the lower end surface 63 a is abutted against the upper end portion 21 m of the tubular body 21. Subsequently, the expanding member 62 is pushed into the tube body 21 by further lowering the pressing member 63 and moving the tube body 21 downward.
Then, as shown in FIG. 6, since the inner peripheral surface 21 s of the tube body 21 is expanded radially outward by the expanding member 62, the cut portion 53 is formed upward from the lower end portion 21 n side. While being broken, the entire circumference of the tube body 21 gradually expands simultaneously. At this time, the tube body 21 is softened by the preheating, and is easily broken at the cut portion 53.

  At this time, the heating wire 22 embedded in the tube body 21 is pulled outward in the radial direction as the tube body 21 expands radially outward. However, the heating wire 22 is a metal wire member wound on the inner peripheral surface 21 s side of the tube body 21 and does not stretch or cut, so that the heating wire 22 expands with the breakage and expansion of the tube body 21. I can't. Therefore, when the tube body 21 starts to be expanded while being broken, the heating wire 22 starts to separate from the tube body 21 and the one end portion 22a becomes the open end, so that the diameter is slightly expanded according to the outer diameter of the expanding member 62. However, it cannot be accompanied by the expansion of the tubular body 21, and is sequentially peeled off from the lower end 21n side of the tubular body 21 and separated.

As the pressing member 63 is lowered, the breakage in the cut portion 53 of the tubular body 21 progresses from below to above. Then, as shown in FIG. 7, the tube body 21 is finally divided into a plurality of broken pieces 20 h at the notch 53.
On the other hand, the heating wire 22 is pushed down along the outer peripheral surface of the expanding member 62 and stays on the surface of the expanding member 62 on the base end 62b side, or gets over the base end 62b and has a concave portion below it. Drop to 65.

As described above, the method for separating the wire of the joint pipe 20 in the present embodiment includes the step of forming the cut portions 53 continuous in the direction of the axis L1 of the pipe body 21 at a plurality of locations in the circumferential direction of the pipe body 21, A step of expanding the inner peripheral surface 21s of the body 21 radially outward and breaking the tube body 21 into a plurality of portions in the circumferential direction.
According to such a configuration, the heating wire 22 can be peeled off from the tube body 21 while minimizing the adhesion of the resin 20j forming the tube body 21, so that the recycling rate of the resin 20j and the heating wire 22 is increased. In this way, the joint pipe 20 is separated into the heating wire 22 and the resin 20j forming the pipe body 21, and the recycling rate of each material can be further increased.

  In the above recycling method, the step of heating the tube body 21 is further provided prior to the step of forming the cut portion 53. Thereby, when the diameter of the tubular body 21 is increased, the resin 20j forming the tubular body 21 and the heating wire 22 are easily separated, and the tubular body 21 is also easily torn. In this way, the joint pipe 20 can be separated efficiently.

Further, in the above recycling method, in the step of breaking the tube body 21, the expanding member 62 whose outer diameter gradually increases from the distal end 62a toward the proximal end 62b is pushed into the tube body 21 to push the tube body 21. The inner peripheral surface of the tube was enlarged, and the tube body 21 was broken into a plurality of pieces in the circumferential direction.
When the expanding member 62 is pushed into the tube body 21 in this way, the inner peripheral surface of the joint tube 20 is expanded with a smaller force than when the tube body 21 is directly expanded in the radial direction to be broken. It becomes easy.

In addition, the breaking device 60 has an outer diameter that gradually increases from the distal end 62 a toward the proximal end 62 b, and an expanding member 62 that is inserted inside the tube body 21, and the expanding member 62 with respect to the tube body 21. And a pressing member 63 that relatively pushes in.
According to such a breaking device 60, the expanding member 62 is inserted into the inside of the tube body 21 and the expanding member 62 is pushed into the tube body 21, whereby the tube body 21 can be broken at the cut portion 53. . As a result, the wire separation method for the joint pipe 20 can be easily and reliably performed.

  In the first embodiment, the expanding member 62 is fixedly provided on the base 61 and the tubular body 21 is pushed into the expanding member 62. However, the present invention is not limited to this. The joint pipe 20 may be broken by setting the joint pipe 20 on the base 61 and inserting the expanding member 62 from above the pipe body 21.

(Second Embodiment)
Next, a second embodiment of the wire separating apparatus according to the present invention will be described. Note that in the second embodiment described below, the same reference numerals are given to the same components as in the first embodiment, and description thereof will be omitted.

FIG. 8 is a diagram illustrating a configuration of the wire separating device 70 according to the second embodiment, and (a) is a diagram illustrating a configuration of the wire separating device 70 in a state before the tube body 21 is broken. These are figures which show the structure of the wire separation apparatus 70 in the state which fractured | ruptured the tubular body 21. FIG.
As shown in FIG. 8A, the breaking device (wire separation device) 70 includes a base 71, a sliding block 72 provided on the base 71, and an expanding core 73. In the breaking device 70, the sliding block 72 and the expanding core 73 constitute an expanding member that expands and breaks the tube body 21.

The joint 71 is mounted on the upper surface of the base 71.
A plurality of sliding blocks 72 are set inside the joint pipe 20 placed on the base 71. The sliding block 72 has a bottom surface 72 a that is a smooth surface, and is slidable along the surface of the base 71. The sliding block 72 has an abutting surface 72 b that abuts against the inner peripheral surface 21 s of the tube body 21 on the side facing the inner peripheral surface 21 s of the tube body 21. The sliding block 72 has an inclined surface 72c on the opposite side of the abutting surface 72b. The inclined surface 72c is formed so as to be gradually separated from the abutting surface 72b as it goes downward from above.

The expanding core 73 has a truncated cone shape whose outer diameter gradually increases from a tip 73a facing downward toward an upper base end 73b.
The expanding core 73 is driven in the vertical direction by a hydraulic cylinder (not shown) or the like.

Such a breaking device 70 can be employed in place of the breaking device 60 in the wire separation method for the joint pipe 20 shown in the first embodiment.
In order to break the joint pipe 20 with the breaking device 70, first, the joint pipe 20 is set on the base 71. A predetermined number of sliding blocks 72 are inserted and arranged in the tube body 21.

  Next, the expansion core 73 is pushed into the space 77 formed by the plurality of sliding blocks 72 in the tube body 21 from above. Then, the sliding block 72 is pressed radially outward by the expanding core 73, and the tube body 21 is expanded radially outward.

As a result, as shown in FIG. 8B, the resin 20j forming the tube body 21 is broken at the cut portion 53.
In this embodiment, the sliding block 72 slides outward in the radial direction of the tubular body 21 by the expanding core 73. Therefore, the heating wire 22 peeled off from the resin 20j forming the tubular body 21 is in a state of being wound around the abutting surface 72b on the outer peripheral side of the sliding block 72. Therefore, after the joint pipe 20 is broken, the heating wire 22 can be easily recovered by pulling the expanded core 73 upward and reducing the diameter of the plurality of sliding blocks 72.

  Also with such a breaking device 70, the heating wire 22 wound in the circumferential direction is separated from the tubular body 21, and the heating wire 22 and the resin 20j forming the tubular body 21 are separated as in the first embodiment. It becomes possible to sort. As a result, the recycling rate can be further increased.

(Other embodiments)
As described above, the wire separation method for the joint pipe 20 of the present invention and the wire separation devices 60 and 70 used therefor have been described with specific examples in the embodiments. However, the present invention is not limited to the above-described embodiments. There are various modifications within the technical scope.
For example, the joint pipe 20 to which the present invention is applied is not limited to the one shown in the above embodiment, and may be, for example, a joint branched in a T shape.

Furthermore, in the above embodiment, the tube body 21 is preheated, but the tube body 21 is not preheated, and the diameter of the joint tube 20 in which the cut portion 53 is formed by an appropriate expanding means may be increased. good.
In addition to this, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate without departing from the gist of the present invention.

20 Joint pipe 22 Heating wire (wire)
21 Tubular 53 Cut section 60, 70 Breaking device (wire separation device)
62 Expanding member 63 Pressing member 72 Sliding block (expanding member)
73 Expanding core (expanding member)
L1 axis

Claims (4)

A step of forming incisions continuously in the axial direction of the tubular body at a plurality of locations in the circumferential direction of the tubular body of a joint pipe including a tubular body and a wire built in the inner peripheral surface of the tubular body. When,
Expanding the inner peripheral surface of the tubular body radially outward and breaking the tubular body into a plurality of pieces in the circumferential direction.   The wire separation method for a joint pipe according to claim 1, further comprising a step of heating the joint pipe prior to the step of forming the cut portion.   In the step of breaking the tubular body, the distal end side of the expanding member whose outer diameter gradually increases from the distal end toward the proximal end is inserted inside the tubular body, and at least the expanded member and the joint pipe 2. The method according to claim 1, wherein one side is pressed to push the expanding member into the tubular body, thereby expanding the inner peripheral surface of the tubular body and breaking the tubular body into a plurality of circumferential directions. 3. The wire separation method for joint pipes according to 2. In the wire separation apparatus used for the wire separation method of the joint pipe according to claim 1 or 2,
An outer diameter gradually increases from the distal end toward the proximal end, and an expanding member inserted into the inside of the tubular body,
And a pressing member that relatively pushes the expanding member into the tubular body.

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