WO2010071256A1

WO2010071256A1 - Triple pipe, manufacturing apparatus thereof and manufacturing method thereof, connecting member connecting the triple pipe and connecting method using the member

Info

Publication number: WO2010071256A1
Application number: PCT/KR2009/000010
Authority: WO
Inventors: 손삼수
Original assignee: Son Sam Soo
Priority date: 2008-12-16
Filing date: 2009-01-02
Publication date: 2010-06-24
Also published as: KR20100069298A; KR101035004B1

Abstract

The present invention implements an apparatus for manufacturing a triple pipe, a manufacturing method thereof, a triple pipe manufactured by the same, a connecting member connecting the triple pipe and a connection method using the member. The manufacturing apparatus in which a metal tube and an outer peripheral surface of the metal tube are surrounded by an inner cover and an outer cover made of double synthetic resins comprises first and second extruding machines, an extrusion die, and a rotating unit. The first extruding machine supplies synthetic resins for extrusion molding of the inner cover of the metal tube. The second extruding machine supplies synthetic resins for extrusion molding of the outer cover of the metal tube on the outer peripheral surface of the inner cover. The extrusion die is connected to the first and second extruding machines and includes inner and outer molds, wherein the inner mold rotates and includes a plurality of mold protrusions for forming the inner cover on the outer peripheral surface of the metal tube and for forming a plurality of hollow parts on the inner cover, and the outer mold is fixed to form the outer cover. The rotating unit is connected to one side of the inner mold to rotate the inner mold.

Description

[Correction 20.12.2009 by Rule 26] (3) Triple pipes, manufacturing apparatus and manufacturing method thereof, connecting member connecting triple pipes and connecting method using same

The present invention relates to a triple pipe, a manufacturing apparatus and a manufacturing method thereof, a connecting member for connecting a triple pipe, and a connecting method using the same, and more particularly, to form an inner skin and an outer skin in which a plurality of spiral hollows are formed on an outer circumferential surface of a metal pipe. To improve the durability of the pipe and to withstand a strong internal pressure, the triple pipe, its manufacturing apparatus and manufacturing method, a connection member for connecting the triple pipe firmly and a connection method using the same.

In the past, an oil pipe, a gas pipe, an oil drilling pipe, a sea water pipe, a communication cable pipe, or a water and sewage pipe used a plastic pipe extruded from PVC or polyethylene as a main raw material.

However, the plastic pipe extruded as described above has a problem that it is difficult to apply to a portion requiring a lot of impact because the strength is weak and easily broken. In particular, there is a problem that a considerable mechanical device is required to extrusion-form a large plastic pipe directly for use as a sewage pipe. In addition, there is a problem that is easily damaged due to the strength of the ground pressure applied from the outside in addition to the internal pressure.

In order to solve this problem, it is being replaced with a hard polyethylene double tube which is inexpensive and easy to work with. However, the conventional double pipe has the trouble of first manufacturing the smooth pipe and then manufacturing the smooth pipe again as a double wall pipe, and when using this method, the volume of the manufacturing apparatus is large and the device is expensive. There is this.

Therefore, the present invention has been made to solve the above problems, by forming a plurality of helical hollow inner shell and shell on the outer circumferential surface of the metal tube to improve the durability of the tube and to withstand strong internal pressure, its triple pipe It is an object of the present invention to provide a manufacturing apparatus and a manufacturing method, a connecting member for firmly connecting such a triple pipe, and a connecting method using the same.

An object of the present invention as described above is a triple pipe manufacturing apparatus for wrapping a metal pipe and the outer peripheral surface of the metal pipe with a double synthetic resin consisting of the endothelial and the outer shell, the first extruder for supplying a synthetic resin for extruding the endothelial to the metal tube; A second extruder for supplying a synthetic resin for extruding the outer shell of the metal tube to the outer peripheral surface of the inner shell; A plurality of forming protrusions connected to the first extruder and the second extruder, forming a endothelium on the outer circumferential surface of the metal tube and forming a plurality of hollows in the endothelium, and a fixed external mold to form a rotating inner mold and the outer shell. Extruded molds; And a rotating means connected to one side of the inner mold to rotate the inner mold.

Here, the synthetic resin supplied from the first extruder and the second extruder uses high strength polyethylene, polypropylene or a mixture thereof.

In addition, the rotating means according to the invention consists of a chain and a motor or gear.

In addition, the manufacturing apparatus according to the present invention comprises a cooling unit for cooling the triple pipe produced through the extrusion mold; And a cutter for cutting the completely cooled triple pipe into a predetermined length.

In addition, the cooler according to the present invention is composed of a first cooler that primarily cools using air and a second cooler that cures by secondary cooling using water.

In another category, an object of the present invention is a triple pipe manufacturing apparatus for wrapping a metal pipe and the outer peripheral surface of the metal pipe with a double synthetic resin consisting of the inner skin and the outer shell, comprising: a first extruder for supplying a synthetic resin for extruding the endothelial metal pipe; A second extruder for supplying a synthetic resin for extruding the outer shell of the metal tube to the outer peripheral surface of the inner shell; A plurality of forming protrusions connected to the first extruder and the second extruder, forming a endothelium on the outer circumferential surface of the metal tube and forming a plurality of hollows in the endothelium, and a fixed external mold to form a rotating inner mold and the outer shell. Extruded molds; And a rotating means connected to one side of the inner mold to rotate the inner mold, the manufacturing method of manufacturing a triple pipe using a triple pipe manufacturing apparatus comprising: supplying a metal tube to an extrusion mold; First step; A second step of forming a endothelium having a plurality of spiral hollows formed on an outer circumferential surface of the metal tube by rotating the inner mold by providing a synthetic resin to an inner mold having a plurality of molding protrusions in a first extruder; A third step of manufacturing a triple pipe by forming a shell on an outer circumferential surface of the endothelium by providing a synthetic resin to an outer mold in a second extruder; A fourth step of primary cooling the manufactured triple pipe using air; A fifth step of curing the first cooled triple pipe by water with secondary cooling; And a sixth step of cutting the cured triple pipe to a predetermined length. It may be achieved by a triple pipe manufacturing method comprising a.

Here, the method may further include a pretreatment step of short blasting or knurling the surface of the metal tube prior to the first step.

In addition, the sixth step consists of a sixth step of cutting the triple pipe and a sixth step of cutting the endothelial and the shell of a predetermined length from both ends of the cut triple pipe.

In another category, an object of the present invention is a metal tube whose surface is knurled or shot blasted; An inner skin of the synthetic resin material formed on the outer circumferential surface of the metal tube and having a plurality of spiral hollow portions uniformly along the length direction; It can be achieved by a triple pipe, including; an outer shell formed by extruding the outer circumferential surface.

In another category, an object of the present invention is to provide a pipe connecting member for connecting a triple pipe, comprising: a coupling ring for coupling to a metal pipe protruding out of the inner and outer skin of the triple pipe; A hollow cylindrical cap provided at a connection portion of the triple pipe provided with a coupling ring and having a plurality of through holes formed in a longitudinal direction thereof; And a heating wire provided at both ends of the inner circumferential surface of the cap, and one end of the cap is protruded to the outside through the through hole of the cap.

Here, one side of the coupling ring is formed with a diagonal cut surface. In addition, the thickness of the coupling ring is the same thickness as the thickness of the inner and outer shell of the triple pipe.

In another category, an object of the present invention is a pipe connection method for connecting a plurality of triple pipes using a pipe connection member, comprising: a first step of transferring a plurality of triple pipes to an installation site; A second step of inserting into the cap to reveal the metal tube of any of the plurality of triple pipes; A third step of tightly installing the metal pipes of each triple pipe in contact with each other; A fourth step of welding the metal tube; A fifth step of twisting and coupling the coupling ring to the outer circumferential surface of the metal tube which is not provided with the shell and the shell; And a sixth step of fixing the center of the cap to the connection portion of the triple pipe, and connecting the power source to the heating wire to thermally fusion the cap to the outer circumferential surface of the outer shell of the triple pipe. Can be achieved.

In the sixth step, the heating wire is heated to 160 ° C to 200 ° C.

In addition, the sixth step may further include a seventh step of checking a connection situation of the triple pipe.

According to the present invention, the inner tube and the outer shell made of synthetic resin on the outer circumferential surface of the metal tube and the metal tube can be manufactured by one manufacturing process, thereby reducing the manufacturing time.

In addition, the metal tube is inserted into the inside of the double tube of the synthetic resin is improved durability and can withstand large internal pressure. In addition, even when the triple pipe according to the present invention is used as an oil pipe, the synthetic resin double pipe is not deformed by the metal pipe, thereby increasing the service life. There is an effect that can be prevented by the coupling ring of the coupling member of the pipe rupture and leakage that may occur due to the size deformation of the pipe connection by thermal expansion or thermal contraction.

In addition, by using a pipe connecting member made of a cap having a coupling ring and a heating wire, the triple pipe can be easily and firmly connected, thereby reducing the construction period.

The following drawings, which are attached in this specification, illustrate the preferred embodiments of the present invention, and together with the detailed description thereof, serve to further understand the technical spirit of the present invention, and therefore, the present invention is limited only to the matters described in the drawings. It should not be interpreted.

1 is a schematic configuration diagram of a triple pipe manufacturing apparatus according to the present invention,

2 is a cross-sectional view of the portion A of FIG.

3 is a flow chart sequentially showing a method of manufacturing a triple pipe according to the present invention;

4 is a perspective view of a triple pipe according to the present invention;

5 and 6 are perspective views of the coupling ring of the coupling member according to the present invention,

7 is a perspective view of a cap of the coupling member according to the present invention;

8 is a flow chart sequentially showing a pipe connection method for connecting a triple pipe using a coupling member according to the present invention,

9 is a view of the use of the coupling member according to the present invention,

Figure 10 is a side cross-sectional view showing an embodiment of connecting the triple pipe using the coupling member according to the present invention.

10: triple pipe 11: metal pipe

12: endothelial 13: spiral hollow

14: sheath 15: weld

20: coupling ring 21: cutting surface

30: cap 31: through hole

32: heating wire 100: knurling device

110: pipe feed means 200: first extruder

300: second extruder 400: extrusion mold

410: internal mold 411: forming protrusion

420: outer mold 500: rotation means

510: chain 520: motor

600: cooling unit 610: first cooler

620: second cooler 700: drawer

800: cutter

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

<3중 파이프 제조장치의 구성><Configuration of Triple Pipe Manufacturing Equipment>

1 is a schematic configuration diagram of a triple pipe manufacturing apparatus according to the present invention. As shown in FIG. 1, the triple pipe manufacturing apparatus according to the present invention includes a knurling apparatus 100 for supplying a metal tube 11 as a whole, a first extruder 200 and a second extruder 300 for supplying a resin, Extrusion mold 400 consisting of an inner mold 410 and an outer mold 420 forming a triple pipe 10, a rotating means 500 for rotating the inner mold 410, formed in the extrusion mold 400 It consists of a cooling unit 600 for cooling the triple pipe 10 and a cutter 800 for cutting the cooled and cured triple pipe 10 to a predetermined length.

The knurling apparatus 100 according to the present invention is a device for supplying metal pipes by nulling the surface of the metal pipe 11, which is the basis of the triple pipe 10, and capable of supplying the surface of the metal pipe 11 by knurling. You can use any ramen. In this case, the metal tube 11 knurled by the knurling apparatus 100 may be supplied using a tube supply apparatus 110 having a conveyor belt or a plurality of rotatable tires.

The first extruder 200 according to the present invention is a device for providing a synthetic resin for forming the inner shell 12 of the triple pipe 10 formed on the outer circumferential surface of the metal tube 11. The first extruder 200 is a device for melting the synthetic resin and providing the molten resin to the extrusion mold 400. Any extruder may be used as long as this object can be achieved. In this case, it is preferable to use a high-strength polyethylene, polypropylene or a mixture thereof.

The second extruder 300 according to the present invention is a device for providing a synthetic resin for forming the outer shell 14 on the outer peripheral surface of the inner shell 12 of the triple pipe 10 formed of the synthetic resin supplied from the first extruder 200 to be. The second extruder 300 is a device that melts the synthetic resin and provides the molten resin to the extrusion mold 400. Any extruder may be used as long as this object can be achieved. In this case, it is preferable to use the same high-strength polyethylene, polypropylene or a mixture thereof as the resin supplied from the first extruder 200. However, according to the use mode, synthetic resins of different materials from synthetic resins supplied from the first extruder 200 may be used.

FIG. 2 illustrates a cross-sectional view of portion A of FIG. 1. Extrusion mold 400 according to the present invention is endothelial 12 using the molten resin supplied from the first extruder 200 and the second extruder 300 on the outer peripheral surface of the tube supplied from the pipe supply means 100 described above. ) And the shell 14. The extrusion mold 400 is installed to correspond to the traveling direction of the pipe supplied from the pipe supply means 100, and is installed to be connected to the first extruder 200 and the second extruder 300. In this case, the first extruder 200 is connected to supply the molten synthetic resin to the extrusion mold 400 before the second extruder 300 with respect to the advancing direction of the metal tube 11. In addition, the extrusion mold 400 is composed of a rotatable inner mold 410 and a fixed outer mold 420, as shown in FIG. Here, the inner mold 410 is made of a hollow cylindrical shape so that the metal tube 11 can penetrate, a plurality of forming projections for forming a plurality of spiral hollow portion 13 in the endothelium 12 on one side of the outer peripheral surface. 411 is formed. The plurality of forming protrusions 411 are formed radially about the central axis of the inner mold 410. In addition, the cross section of the forming protrusion 411 may be formed in a parallelogram, rectangular, square, round or oval. The plurality of forming protrusions 411 may be formed in various ways according to the size and usage of the pipe, preferably 35 to 55 pieces.

The outer mold 420 according to the present invention is formed in a cylindrical shape as a whole, and the inlet side through which the metal mold 11 is supplied to the inner mold 410 described above protrudes a predetermined length, and a portion except the protruding portion is inserted. The hollow portion is formed so that it can be. In addition, the groove is formed so that the resin supplied from the second extruder 300 can be supplied. The length of the outer mold 420 is longer than the length of the outlet side of the inner mold 410, the synthetic resin supplied from the inner mold 410 is first fixed in the metal tube 11 to form the inner shell 12 After that, it is preferable that the outer shell 14 can be formed on the outer peripheral surface of the inner shell 12. One side of the outer mold 420 is bonded to the inner mold 410 is connected to the bearing so that the inner mold 410 is rotated so as not to interfere with the rotation of the inner mold (410).

The exit sides of the inner mold 410 and the outer mold 420 are inclined about a predetermined angle so that the synthetic resins supplied from the first extruder 200 and the second extruder 300 can be smoothly fixed to the metal pipe 11. It is good to be formed. The synthetic resin supplied from the first extruder 200 flows between the inner mold 410 and the outer mold 420 to form the inner shell 12 of the metal tube 11, and the synthetic resin supplied from the second extruder 300 It flows into the groove formed in the metal mold 420 to form the outer shell 14 of the metal tube 11.

Rotating means 500 according to the present invention is a motor 520 for rotating the chain 510 and the chain 510 is provided to surround the outer peripheral surface of the inner mold 410 protruding to the outside of the outer mold (420) It is composed. The chain 510 rotates the inner mold 410 by the rotational force provided by the motor 520. The rotational speed of the motor 520 is preferably rotated at a speed capable of rotating the inner mold 410 to form a gentle spiral hollow portion 13 on the endothelium 12 of the triple pipe 10. Preferably, the inner mold 410 is rotated at a speed of rotating one time in 25 to 35 seconds. Rotating means 500 consisting of a chain 510 and a motor 520 can be used by replacing the gear (not shown) according to the use mode.

The cooling unit 600 according to the present invention is a device for cooling and curing the endothelial 12 and the outer shell 14 formed on the outer circumferential surface of the metal tube 11 as long as it can achieve this purpose. It's okay. However, preferably, the synthetic resin of the triple pipe 10 may be formed by secondly cooling the triple pipe 10 by using a first cooler 610 that primarily cools the triple pipe 10 using air and water. It consists of a second cooler 620 to completely cool by curing. The reason for separating the air-cooled first cooler 610 and the water-cooled second cooler 620 is that the cooling time is long when the synthetic resin that has been melted at a high temperature is cooled only by the air-cooled first cooler 610. In the case of cooling using only the water-cooled second cooler 620, there is a problem that deformation or breakage such as distortion occurs due to a sudden temperature change of the synthetic resin melted at a high temperature. In order to prevent these problems, the primary cooling is performed by using air, and the primary cooled triple pipe 10 is secondarily cooled in the second cooler 620 using water to harden in an instant.

The extractor 700 according to the present invention is a device for supplying a smoother metal pipe 11 because it is difficult to proceed smooth supply of the pipe only by the pipe supply means 100. Any machine 700 may be used as long as this object can be achieved. However, it is preferable to use a drawer 700 having a plurality of rotating devices in the conveyor belt or inside thereof to take out the triple pipe 10 by the rotating force of the rotating device.

The cutter 800 according to the present invention is a device that cuts the triple pipe 10 that is completely cooled and cured by the second cooler and the second cooler to a predetermined length so as to be easily transported and installed. Any cutter 800 may be used as long as the cutter 800 can achieve this purpose, but it is preferable to use the cutter 800 commonly used in the art. The cutter 800 may further include a device capable of shaving a predetermined length of the synthetic resin at both ends of the triple pipe 10 cut therein. However, if it is difficult to provide such a device according to the installation situation or the like, the synthetic resin may be peeled off manually. In this way, the length of the metal pipe 11 to cut out the synthetic resin of the inner skin 12 and the outer shell 14 and protrudes to the outside is a length such that a welding rod for welding the metal pipe 11 can be inserted when the pipe is joined. good. However, it is preferable to scrape off the endothelium 12 and the shell 14 so that the metal tube 11 protrudes from 3.5 mm to 5 mm.

<3중 파이프의 제조방법><Method of manufacturing triple pipe>

Figure 3 shows a flow chart sequentially showing a method of manufacturing a triple pipe according to the present invention. As shown in FIG. 3, first, the surface of the metal tube 11 is treated using shot blasting or knurling in the knurling apparatus 100 (S50).

Next, the metal tube 11 with the surface treatment is supplied to the extrusion die 400 (S100).

Next, a plurality of spiral hollow portions (not shown) are formed on the outer circumferential surface of the metal tube 11 supplied by rotating the inner mold 410 having the plurality of molding protrusions 411 formed using the molten synthetic resin supplied from the first extruder 200. 13 to form the endothelial 12 is formed (S200). In this case, the molten synthetic resin supplied from the first extruder 200 flows between the inner mold 410 and the outer mold 420 of the extrusion mold 400, and the inner mold 410 is connected to one side of the inner mold 410. It rotates by the rotational force of the motor 520 connected by the chain 510.

Next, using the molten synthetic resin supplied from the second extruder 300 to form a shell 14 on the outer peripheral surface of the endothelial 12 to produce a triple pipe (10) (S300). At this time, the molten synthetic resin supplied from the second extruder 300 flows into the groove formed in the outer mold 420 of the extrusion mold 400.

Next, the triple pipe 10 manufactured by forming the inner shell 12 and the outer shell 14 on the outer circumferential surface of the metal tube 11 is transferred to the first cooler 610, which is an air-cooled cooler using air, to triple the pipe ( Cooling the endothelial 12 and the outer shell 14 of 10) (S400). In this case, in the first cooler 610, the inner shell 12 and the outer shell 14 may be cooled to about 100 ° C. or lower.

Next, the first cooled triple pipe 10 is completely cooled in a second cooler 620 that is a water-cooled cooler using water to harden the inner skin 12 and the outer skin 14 of the triple pipe 10 ( S500).

Finally, the hardened triple pipe 10 is cut to a predetermined length to complete the manufacture of the triple pipe 10 (S600). At this time, the cutting of the triple pipe 10 (S600) preferentially cuts the pipe 10 to a predetermined length as a whole (S610), for the pipe connection of the triple pipe 10 of the triple pipe 10 The synthetic resin constituting the inner shell 12 and the outer shell 14 of a predetermined length is cut off from both ends to finish the work (S620).

<3중 파이프의 구성><Configuration of Triple Pipes>

4 shows a perspective view of a triple pipe according to the invention. The triple pipe 10 according to the present invention is a pipe used for an oil pipe, a gas pipe, an oil drilling pipe, a seawater pipe, a communication cable pipe, or a water and sewage pipe. Such a configuration of the triple pipe 10 is formed on the outer circumferential surface of the metal tube 11, the metal tube 11 of a predetermined length, as shown in Figure 4, a plurality of spiral hollow along the longitudinal direction of the metal tube 11 It consists of an endothelial 12 having a portion 13 formed therein and an outer sheath 14 formed on the outer circumferential surface of the endothelial 12. At this time, the length of the metal tube 11 is formed to be a predetermined length girder than the length of the endothelial 12 and the outer shell 14 is preferably made to protrude 3.5mm to 5mm to both ends of the endothelial 12 and the outer shell 14. As the material of the metal pipe 11, a general metal pipe, steel pipe, stainless steel pipe, cast iron pipe or copper pipe may be used. In addition, the material of the inner shell 12 and the outer shell 14 formed on the outer circumferential surface of the metal tube 11 may be high strength polyethylene, polypropylene, or a mixture thereof. At this time, the material of the endothelial 12 and the outer shell 14 may be made of the same material, or may be made of different materials depending on the use mode.

<관 연결부재의 구성><Configuration of pipe connecting member>

The pipe connecting member according to the present invention is a device for preventing the leakage of the connecting portion when connecting the triple pipe 10 manufactured by the above-described manufacturing apparatus or manufacturing method, it is provided with a coupling ring 20 and the heating wire 32 as a whole. It consists of one cap 30.

Figure 5 shows a perspective view of the coupling ring of the coupling member according to the present invention. The coupling ring 20 according to the present invention is for covering the metal pipe 11 exposed to the outside after the metal pipes 11 of the two triple pipes 10 are welded to each other to form a weld 15. As shown, it consists of a circular ring shape. The coupling ring 20 is to be coupled after the triple pipe 10 is connected, the cutting surface 21 is formed on one side thereof. As shown in Figure 6, the cut surface 21 is preferably formed in an oblique line to facilitate the twisting of the coupling ring 20. The coupling ring 20 may be made double in the same way as the inner shell 12 and the outer shell 14 of the triple pipe 10. In addition, the thickness of the coupling ring 20 is preferably made of the same thickness as the combined thickness of the inner shell 12 and the outer shell 14 of the triple pipe 10. The coupling ring 20 is a triple length by preventing the breakage of the connection portion of the triple pipe 10 due to thermal expansion or the leakage of the connection portion due to thermal contraction due to the expansion of the long length of the triple pipe 10 The service life of the pipe 10 can be extended.

Figure 7 shows a perspective view of the cap of the coupling member according to the present invention. The cap 30 according to the present invention has a hollow cylindrical shape with an inner diameter equal to the outer diameter of the triple pipe 10. One side of the cap 30 is formed with a plurality of through holes 31, the length of the cap 30 is preferably 200mm to 300mm. At this time, the number of the through holes 30 is preferably formed two or four. In addition, it is provided at both ends of the inner circumferential surface of the cap 30 is provided to spirally wound a predetermined length along the inner circumferential surface of the cap 30, one end of which is heated to the outside through the through hole 31 of the cap 30 32 is provided.

<관 연결방법><Pipe connection method>

Figure 8 shows a flow chart sequentially showing a pipe connection method for connecting a triple pipe using the coupling member according to the present invention. As shown in FIG. 8, first, a plurality of triple pipes 10 are transferred to the installation site.

Figure 9 shows a diagram of the use of the coupling member according to the present invention. Next, as shown in FIG. 9, any triple pipe 10 of the plurality of triple pipes 10 is inserted into the cap 30. Thereafter, the cap 30 is pushed into the center of the triple pipe 10 by a predetermined length so that the metal pipe 11 of the triple pipe 10 is exposed (S100).

Next, the metal pipe 11 of each triple pipe 10 is in close contact with each other and installed in accordance with the installation position (S200).

Figure 10 shows a side cross-sectional view showing a usage example of connecting the triple pipe using the coupling member according to the present invention.

Next, as shown in FIG. 10, the welded portion 15 is formed by welding the metal pipe 11 of each triple pipe 10 using a welder (S300).

Next, the cut surface 21 cut by the oblique line of the coupling ring 20 of the coupling member on the outer circumferential surface of the metal tube 11, that is, the outer shell 12 and the outer shell 14 are not formed, that is, the outer circumferential surface of the welded metal tube 11. In accordance with the direction of the coupling by twisting the coupling ring 20 (S400).

Finally, the cap 30, which has a predetermined length away from the center of the triple pipe 10, is fixed to the connection portion. At this time, it is preferable that the center of the cap 30 is matched with the weld 15 of the triple pipe 10. And it is wound on the inner circumferential surface of the cap 30, and the one end is heated by connecting a power source to the heating wire 32 protruding into the through hole 31 of the cap 30. At this time, the heating wire 32 is heated to 160 ℃ to 200 ℃ by melting the inner peripheral surface of the cap 30 around the heating wire 32 and the outer peripheral surface of the outer shell 14 of the triple pipe 10 by heat-sealing and joining the pipe connection Finish the work (S500).

At this time, the non-destructive inspection or the state of leakage of the fluid can be checked to check the connection state of the connected pipe (S600).

As described above, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, the above-described embodiments are to be understood in all respects as illustrative and not restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be construed as being included in the scope of the present invention.

Claims

In the triple pipe manufacturing apparatus for wrapping the metal tube 11 and the outer peripheral surface of the metal tube 11 with a double synthetic resin consisting of the inner shell 12 and the outer shell 14,

A first extruder (200) for supplying a synthetic resin for extruding the endothelium (12) to the metal tube (11);

A second extruder (300) for supplying a synthetic resin for extruding the outer shell (14) of the metal tube (11) to the outer circumferential surface of the inner shell (12);

It is connected to the first extruder 200 and the second extruder 300, and forms the endothelium 12 on the outer circumferential surface of the metal tube 11 and a plurality of spiral hollow portion 13 in the endothelium 12 A plurality of molding protrusions 411 for forming an extrusion mold 400 formed of a rotating inner mold 410 and an outer mold 420 fixed to form the shell 14; And

And a rotating means (500) connected to one side of the inner mold (410) to rotate the inner mold (410).
The method of claim 1,

The metal pipe (11) is a triple pipe manufacturing apparatus, characterized in that the steel pipe, stainless steel pipe, cast iron pipe or copper pipe.
The method of claim 1,

The synthetic resin supplied from the first extruder (200) and the second extruder (300) is a triple pipe manufacturing apparatus, characterized in that the high-strength polyethylene, polypropylene or a mixture thereof.
The method of claim 1,

The first extruder (200) is a triple pipe manufacturing apparatus characterized in that connected to supply the synthetic resin to the extrusion mold 400 before the second extruder (300) with respect to the traveling direction of the metal pipe (11).
The method of claim 1,

The rotating means 500 is a triple pipe manufacturing apparatus, characterized in that consisting of a chain (510) and the motor (520) or gear.
The method of claim 1,

Cooling unit 600 for cooling the triple pipe (10) produced through the extrusion mold (400); And

And a cutter (800) which cuts the triple pipe (10) which is completely cooled to a predetermined length.
The method of claim 6,

The cooling unit 600,

A first cooler 610 that cools using air; And

The second pipe cooler (620) for cooling and curing using water; Triple pipe manufacturing apparatus characterized in that consisting of.
The method of claim 6,

The cutter 800 cuts the triple pipe 10 to a predetermined length, and cuts the synthetic resin at both ends of the cut triple pipe 10 by a predetermined length to protrude the metal pipe 11. Triple pipe manufacturing apparatus characterized by.
The method of claim 8,

The length of the protruding metal tube 11 is 3.5mm to 5mm, characterized in that the triple pipe manufacturing apparatus.
The method of claim 6,

Triple-pipe manufacturing apparatus, characterized in that further provided between the cooling unit (600) and the cutter (800) for discharging the triple pipe (10) more smoothly.
In the triple pipe manufacturing apparatus that wraps the metal tube 11 and the outer circumferential surface of the metal tube 11 with a double synthetic resin consisting of the inner shell 12 and the outer shell 14, the extrusion of the endothelial 12 to the metal tube 11 A first extruder 200 for supplying a synthetic resin for; A second extruder 300 for supplying a synthetic resin for extruding the outer shell 14 of the metal tube 11 to an outer circumferential surface of the inner shell 12; It is connected to the first extruder 200 and the second extruder 300, the endothelial 12 is formed on the outer circumferential surface of the metal tube 11 and a plurality of hollow portions 13 formed on the endothelial 12 A plurality of molding protrusions 411 to be formed, the extrusion mold 400 including an inner mold 410 which rotates and an outer mold 420 fixed to form the shell 14; And a rotating means 500 connected to one side of the inner mold 410 to rotate the inner mold 410. The triple pipe 10 by using a triple pipe manufacturing apparatus, comprising: In the manufacturing method to manufacture,

A first step (S100) of supplying a metal tube (11) to the extrusion mold (400);

The first extruder 200 provides a synthetic resin to the inner mold 410 in which the plurality of molding protrusions 411 are formed, thereby rotating the inner mold 410 to form a plurality of spiral hollow parts on the outer circumferential surface of the metal tube 11. A second step (S200) of forming an endothelial (12) in which (13) is formed;

A third step (S300) of preparing a triple pipe (10) by forming a shell (14) on the outer circumferential surface of the endothelium (12) by providing a synthetic resin to the outer mold (420) in the second extruder (300);

A fourth step (S400) of primary cooling the manufactured triple pipe (10) using air;

A fifth step (S500) of curing the first cooled triple pipe (10) by secondary cooling with water; And

And a sixth step (S600) of cutting the cured triple pipe (10) to a predetermined length.
The method of claim 11,

And a pretreatment step (S50) of treating the surface of the metal tube (11) by shot blasting or knurling prior to the first step (S100).
The method of claim 11,

The sixth step (S600),

6-1 step (S610) of cutting the triple pipe (10); And

6-2 step (S620) of cutting the endothelial (12) and the outer skin (14) of a predetermined length from both ends of the cut triple pipe (10); triple pipe manufacturing method characterized in that consisting of.
A metal tube 11 whose surface is knurled or shot blasted;

An inner skin 12 of a synthetic resin material formed on an outer circumferential surface of the metal tube 11 and having a plurality of spiral hollow portions 13 uniformly along a length direction; And

Triple pipe, characterized in that it comprises ;; an outer shell (14) extruded on the outer peripheral surface of the inner shell (12).
The method of claim 14,

Both sides of the triple pipe (10) is a triple pipe, characterized in that the metal tube (11) protrudes a predetermined length more than the inner shell (12) and the shell (14).
The method of claim 15,

The metal pipe (11) is a triple pipe, characterized in that protrudes 3.5mm to 5mm more than the inner shell (12) and the outer shell (14).
In the pipe connecting member for connecting the triple pipe (10) according to claim 14,

A coupling ring 20 coupled to the inner tube 12 of the triple pipe 10 and the metal tube 11 protruding to the outside of the shell 14;

A hollow cylindrical cap 30 provided at a connection portion of the triple pipe 10 provided with the coupling ring 20 and having a plurality of through holes 31 in a longitudinal direction thereof; And

And a heating wire (32) provided at both ends of the inner circumferential surface of the cap (30), the one end of which is protruded to the outside through the through hole (31) of the cap (30).
The method of claim 17,

The coupling ring 20 is a pipe connecting member, characterized in that the cut surface 21 is formed on one side to fit into the metal pipe (11) of each of the triple pipe (10) to be coupled.
The method of claim 17,

The thickness of the coupling ring 20 is a pipe connecting member, characterized in that made of the same thickness as the thickness of the inner shell (12) and the outer shell (14) formed on the outer peripheral surface of the metal tube (11).
In the pipe connection method for connecting a plurality of triple pipes 10 using the pipe connection member according to claim 17,

A first step (S100) of inserting into the cap 30 so that the metal pipe 11 of any of the plurality of triple pipes 10 is exposed;

A second step (S200) of closely contacting the metal pipes 11 of the triple pipes 10 so as to contact each other;

A third step (S300) of welding the metal tube (11);

A fourth step (S400) of twisting and engaging the coupling ring 20 to the outer circumferential surface of the metal tube 11 which is not provided with the endothelium 12 and the outer shell 14; And

The center of the cap 30 is fixed to the connection portion of the triple pipe 10, and the power wires are connected to the heating wire 32 to heat the cap 30 to the outer circumferential surface of the shell 14 of the triple pipe 10. A fifth step of fusion (S500); pipe connection method comprising a.