KR20030055941A - A Method and Device for Forming of Multi-Pipe - Google Patents

Abstract

PURPOSE: A device and method for forming a multiple pipe is provided to prevent the corrosion of the pipe by coating the whole surface of the pipe. CONSTITUTION: A chamber(100) has a chamber body(110) to form a heating space(120). A heating unit(130) is installed in the chamber body. A pipe forming unit(200) is composed of a cylinder(220) connected to a rod(220a) and rotatably inserted into one side of the chamber, and a rotary shaft(230) rotatably connected to the other side of the chamber. Pipe support units(240) are installed at the cylinder and the rotary shaft, respectively.

Description

Multi-pipe Forming Apparatus and Forming Method {A Method and Device for Forming of Multi-Pipe}

The present invention relates to a multi-tube forming apparatus for coating and bonding a synthetic resin tube to a metal tube, which is particularly easy to the synthetic resin tube inside the metal tube in a configuration including a chamber and a rotatably installed inside the chamber. The present invention relates to a multi-tube forming apparatus for coating adhesion.

The present invention also relates to a multi-tube forming method of inserting a synthetic resin tube into a metal tube and rotating the metal tube and the synthetic resin tube at high speed while heating the heat to soften the synthetic resin tube on the inner surface of the metal tube by centrifugal force.

In general, the multi-tubes formed by mutually bonding the first and second tubes made of heterogeneous materials include a method of bonding the first and second tubes to each other by means of a mold and the first and second tubes by using the expansion force of the tubes. Multi-tubes are manufactured by a method of adhering the tubes to each other and a method of adhering the first and second tubes to each other using vacuum adsorption.

As described above, the method of bonding the first and second tubes of different types to each other using a mold includes disposing a molding inner mold in a metal tube formed so that the diameter of one end thereof is enlarged, and forming a synthetic resin tube smaller than the inner diameter of the metal tube in the metal tube. The synthetic resin tube is expanded by the inner mold and adhered to the inner surface of the metal tube.

However, after making the synthetic resin tube smaller than the inner diameter of the metal tube, insert the synthetic resin tube into the inner side of the metal tube to which the adhesive is applied to the inner surface, insert the inner mold into the inner surface of the synthetic resin tube, and then expand the inner mold in a state in which heat is applied from the outside. As a joint between the synthetic resin tube and the metal tube, the bonding property is good, but because of the large concentricity (ellipse occurrence) of the metal tube, there is a problem in that partial voids occur.

In addition, the method of mutually bonding the heterogeneous first and second tubes using the expansion force of the tube, the adhesive is applied to the outer surface of the synthetic resin tube to be reduced in diameter in the contracted state in the freezer compartment, and the synthetic resin tube is also in the freezer compartment When pressed into the inside of the shrinking metal tube and left at room temperature, the synthetic resin tube is expanded and the bonding is made inside the metal tube.

However, the above manufacturing method is somewhat advantageous in terms of productivity, but when the metal tube and the synthetic resin tube are put into the freezer compartment, the moisture in the freezer compartment adheres to the surface of the material, resulting in incomplete adhesion due to moisture even after bonding, and water remains between the two adhered surfaces. As a result, metal tube corrosion occurs.

On the other hand, the method of mutually bonding the first and second tubes of different types using vacuum adsorption, after applying the adhesive resin on the outer surface of the synthetic resin, and inserted into the inner surface of the metal tube, and heating the metal tube to the inner surface of the metal tube and the synthetic resin tube There is a method in which air existing between the outer surfaces is discharged to a gate by using a vacuum pump and bonded.

The double pipe produced by the above-mentioned manufacturing method is to be joined closely by physical force, and to be bonded by applying a heat source using vacuum pressure. The double pipe produced by the above method requires a high degree of difficulty and the like. There are a lot of problems.

An object of the present invention for improving this is to provide a molding apparatus and a method for forming a multi-tube to completely prevent the corrosion of the pipe by coating the entire surface of the metal tube exposed to air.

1 is a cross-sectional view showing a multi-tube forming apparatus according to the present invention

Figure 2a, b is a side view and a cross-sectional view showing a tube support state of the multi-tube forming apparatus according to the present invention, respectively

3A and 3B are a plan view and a side view, respectively, of a multi-coated tube coated in accordance with another embodiment of the present invention;

Figure 4 is a perspective view showing a shrinkage device of a synthetic resin tube according to another embodiment of the present invention

Figure 5 is a flow chart showing a multi-tube forming process according to the present invention

* Description of the symbols for the main parts of the drawings *

100 ... chamber 120 ... heating space

210.Frame 220.Cylinder

230 ... spindle 270 ... steam line

280 vacuum line

In order to achieve the above object, the present invention, the chamber is provided with a heating means on the inside of the body is formed a heating space therein,

Consists of a cylinder that is rotatably connected to one side of the chamber and a hollow rotating shaft rotatably connected to the other side of the chamber, and comprises a tube-forming part is installed on each end of the cylinder and the rotating shaft Provided is a multi-tube forming apparatus.

Moreover, this invention is the process of apply | coating an anticorrosive adhesive agent on the inner surface of a metal tube;

Inserting a synthetic resin tube into an inner surface of the metal tube;

Adhering the synthetic resin tube to the inner diameter and the tube end of the metal tube; and,

It provides a multi-tube forming method comprising the step of bonding the synthetic resin tube to the inner surface of the metal tube by rotating while heating the metal tube synthetic resin tube.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figures 1 to 4, the multi-pipe forming apparatus of the present invention is configured to include a chamber 100 and a pipe forming part 200 which is rotatably installed inside the chamber 100. .

The chamber 100, the body 110 is formed to form a heating space 120 therein, the heating means 130 is installed therein, the body 110, the heat insulating layer is filled with glass fiber, etc. 110a is integrally formed.

The heating means 130 is made of a gas line (130a) is inserted into the chamber body 110 to heat the heating space 110 and a plurality of nozzles (130b) connected to the end thereof.

The tube forming part 200 installed in the chamber 100 includes a cylinder 220 that is supported by the frame 210 and is detachably connected to one side of the chamber 100 via a clutch 290. The rod 220a and the hollow rotating shaft 230 connected to each other through the clutch 290 to be separated and coupled to the other side of the chamber 100, the rod 220a and the rotating shaft 230 Tube support means 240 are respectively connected to the end of the).

The pipe support means 240, the fixed chuck (240a) (240b) connected to the end of the cylinder and the rotating shaft, respectively, and the fixing jig (240c) fixed to the end of the cylinder and the rotating shaft while being located on the inner diameter side of the fixed chuck ( 240d).

A through hole 250 is formed in the fixing jig 240d so as to penetrate the hollow rotating shaft 230 and the through hole. The rotating shaft 230 has a steam line 270 and a vacuum line 280 branched at one side thereof. Connected.

In addition, the dustproof opening 290 is formed in the central portion in the longitudinal direction of the chamber 100 to prevent the bending of the tube supported by the fixing chuck.

On the other hand, as shown in Figure 4, the synthetic resin pipe reduction apparatus is installed with a vacuum pad 400a (400b) is connected to the vacuum line 280 to shrink the synthetic resin tube 190 is inserted into the inside of the metal tube 180 It is installed separately.

Reference numeral 260 is a fixing bolt, 180, 190 is a metal tube and a synthetic resin tube, 170 is an anticorrosive adhesive to be filled between the metal tube and the synthetic resin tube.

Referring to the operation of the present invention made of the above configuration as follows.

1 and 2, in the state in which the anti-corrosive adhesive 170 is coated on the inner surface of the metal tube 180, a synthetic resin tube 190 having an outer diameter substantially smaller or smaller than the inner diameter of the metal tube 180 is formed. The ends of the metal pipe 180 are inserted and fixed as fixing jigs 240c and 240d, respectively.

In this case, the fixing jig (240c) (240d), respectively, via the clutch 290 at the end of the rod 220a and the rotating shaft 230 of the cylinder 220 is rotatably connected to the inside of the chamber 100, respectively By being connected, the clutch 290 is rotated integrally inside the chamber 100 when the clutch 290 is separated.

The rod 220a is easily rotated by disconnecting the clutch 290 after the movement by the cylinder 220 and then connecting a pulley (not shown) connected to one side thereof as a driving motor and a belt. When the pulley is rotated, the metal tube 180 and the synthetic resin tube 190 fixed by the fixing jig 240c and 240d are rotated.

In addition, the cylinder rod 220a is fastened to the outer surface of the tube as a plurality of fixing bolts 260 fixed to the metal tube 180 by fixing fixing chucks 240a and 240b for fixing the metal tube 180. Prevent the flow of the pipe due to rotation.

In addition, the heating means 130 for heating the inner surface of the chamber 100 is installed to be heated by a plurality of nozzles (130b) located below the chamber (100).

Then, by installing a dustproof opening 290 is installed in the longitudinal center portion of the chamber 100 to prevent deformation and fluctuation of the tube due to the high-speed rotation of the metal tube 180.

In addition, the fixing jig 240d is formed with a through-hole 250 to which the steam line and the vacuum line are connected to heat the inside of the synthetic resin tube 190 press-fitted at both ends or to discharge the air therein.

At this time, after fixing both ends of the synthetic resin tube 190 by the fixing jig 240d and sucking the air inside the synthetic resin tube through the through hole 250, the tube is contracted, and the outer diameter side of the synthetic resin tube contracted. Insertion of the metal tube 180 is facilitated.

On the other hand, a separate synthetic resin tube shrinkage device as shown in Figure 4 may be provided, the synthetic resin tube shrinkage device is composed of a sealing cap (400a) (400b) in close contact with each of the tube ends of the synthetic resin tube 190, The sealing caps 400a and 400b may be manufactured by using a non-metal, and then thinly coated with silicon rubber or the like.

In addition, the sealing cap 400b is connected to the vacuum line 280 in which the through hole 250 is formed at the center thereof, and when the inner air is discharged, the diameter of the synthetic resin tube is reduced, so that the synthetic resin tube is easily inside the metal tube. Insert it.

On the other hand, in the method of manufacturing a multi-pipe, the powdery anticorrosive adhesive 170 is applied to the exposed surface (inner diameter side, both ends and the outer diameter side) while heating the metal tube 180 at a constant speed.

Subsequently, a synthetic resin tube 190 having an outer diameter at least equal to the inner diameter of the metal tube 180 is inserted into the inner diameter side of the metal tube on the inner diameter side of the metal tube 180 to which the adhesive 170 is applied.

Subsequently, the metal tube 180 into which the synthetic resin tube 190 is inserted is rotated while heating at a constant speed so that the outer surface of the synthetic resin tube 190 is coated and adhered to the inner surface side of the metal tube 180.

Meanwhile, after the anticorrosive adhesive 170 is rotated on the outer diameter side of the metal tube 180 to which the synthetic resin tube 190 is bonded to the inner diameter side, the synthetic resin tube may be coated and bonded to cover the entire surface of the metal tube.

Referring to the operation of the present invention made of such a configuration as follows.

As shown in FIG. 5, the inner diameter of the metal tube 180 is coated on the inner surface and both ends of the metal tube 180 while the anticorrosive adhesive 170 is rotated while being heated at a predetermined temperature.

In addition, the anticorrosive adhesive 170 adhered to the surface of the metal tube 180 is preferably coated with a thickness of 0.3 to 0.5 mm, and when the synthetic resin tube 190 is manufactured, the coating thickness is subtracted from the inner diameter of the metal tube 180. The dimension is the outer diameter of the synthetic resin tube 190.

At this time, the outer diameter of the synthetic resin tube 190 is generally not inserted because it is the same as or larger than the inner diameter of the metal tube 180, as shown in Figure 4, the fixing jig is in close contact with the end of the synthetic resin tube 190 The synthetic resin tube 190 is reduced in diameter by operating the vacuum line in a state in which the sealing caps 400a and 400b are compressed, and then inserted into the metal tube 180.

When the insertion of the synthetic resin tube 190 is completed, the synthetic resin tube 190 is restored by the heating air supplied through the steam line, and the outer diameter side thereof closely adheres to the inner diameter side of the metal tube 180 heated by the gas line and the nozzle. It will be.

In addition, the synthetic resin tube 190 is to cover the both ends by protruding slightly greater than the thickness of the metal tube at the end of the metal tube (1).

In addition, the metal tube 180 and the synthetic resin tube 190 are mutually dissolved by dissolving the adhesive 170 at a temperature of 200 to 240 ° C. and a surface temperature of the metal tube 180 to 170 to 190 ° C. in the chamber 100. Thermosetting adhesive.

At this time, the external force is required for the adhesion, in the present invention, by using a centrifugal force, and for this purpose, by rotating the pulley at a speed of 300 to 600 per minute using a motor not shown in the state where the clutches are separated, both ends are fixed. The metal tube and the synthetic resin tube fixed through the jig and the fixing chuck are rotated integrally to obtain the force necessary for bonding.

In addition, after the adhesion of the metal tube and the synthetic resin tube is completed, the desorption is moved to the cooling chamber and cooled slowly to 90 ~ 100 ℃ to stop the growth of the anti-corrosive adhesive resin while the synthetic resin tube (3) is fused to the metal tube (1) Mold the tube.

On the other hand, by coating the synthetic resin tube by the extrusion bonding on the outside of the metal tube to be coated with the synthetic resin tube inside, it is possible to manufacture a multi-tube covering the entire surface of the metal tube.

Thus, according to the multi-tube forming apparatus and the molding method of the present invention, the inner and outer surfaces of the metal tube and the pipe end are heat-sealed with a synthetic resin tube to produce the most perfect synthetic coated steel pipe without any corrosion under any environmental conditions. The adhesive strength is increased, and there is no corrosion of the pipe even when used in water pipe, chemical plant, offshore plant pipe, underground buried pipe, etc. in terms of utilization.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as provided by the following claims. I would like to clarify that those who have knowledge of this can easily know.

Claims (10)

The chamber body 110 is installed to form a heating space 120 therein, and the chamber 100 in which the heating means 130 is installed therein; It is composed of a cylinder 220 is inserted into one side of the chamber 100 to be rotatable so that the rod 220a is connected and a hollow rotating shaft 230 rotatably connected to the other side of the chamber 100, the cylinder Multi-tube forming apparatus comprising a tube forming unit 200 is provided with tube support means 240, respectively, at the end of the 220 and the rotating shaft 230 According to claim 1, wherein the heating means 130, the heating space 110 is made of a gas line 130a is inserted into the chamber body 110 so as to generate heat and a plurality of nozzles (130b) connected to the end thereof. Multi-tube forming apparatus, characterized in that the losing According to claim 1, The tube support means 240, and the fixing chuck (240a) (240b) and coupled to each of the rod 220a and the rotating shaft 230 to be coupled and detachable via a clutch 290 Located in the inner diameter side of the fixing chuck and fixed to the end of the cylinder and the rotating shaft (240c) (240d), a through-hole 250 is formed in the fixing jig (240d) steam line 270 on one side ) And the vacuum line 280 is a multi-pipe forming apparatus, characterized in that installed to branch The multi-pipe forming apparatus according to claim 1, wherein the chamber (100) is provided with a dustproof opening (290) at a central portion in the longitudinal direction of the chamber (100) to prevent bending of the metal pipe supported by the fixing chuck. According to claim 1, The tube forming unit 200, the vacuum pad is connected to the vacuum line 280 while being in close contact with both ends of the synthetic resin tube 190 inserted in the inner side of the metal tube 180 to the shaft diameter, respectively. Multi-tube forming apparatus, characterized in that a separate tube shrinkage device configured as (400a) (400b) is installed Applying a powdery anticorrosive adhesive to the inner diameter side while rotating the metal tube; Inserting a synthetic resin tube having an outer diameter at least equal to the outer diameter of the metal tube inside the metal tube to which the adhesive is applied; And rotating the metal tube and the synthetic resin tube while heating the metal tube and bonding the surface of the synthetic resin tube to the inner diameter side of the metal tube. 7. The process of claim 6, wherein the step of adhering the surface of the synthetic resin pipe to the inner diameter side of the metal pipe by rotating the metal pipe while heating is performed by rotating the metal pipe 180 at a speed of 200 to 600 minutes per minute after the surface temperature of the metal pipe 180 is 160 to 190 deg. Multi-tube molding method characterized in that 7. The method of forming a multi-pipe according to claim 6, wherein after coating the anti-corrosive adhesive on the outer diameter side of the metal tube to which the synthetic resin tube is coated and bonded, the synthetic resin tube is coated and bonded. The method of claim 6, wherein the step of inserting the synthetic resin tube into the inner side of the metal tube to which the adhesive is applied comprises inserting a synthetic resin tube having a length covering both ends of the metal tube. The method of claim 6, wherein the step of inserting the synthetic resin tube into the inner side of the metal tube to which the adhesive is applied, shrinks the synthetic resin tube by vacuum, inserts it into the inner side of the metal tube, and supplies the heated air to the inner side of the synthetic tube. Method for forming a tube according to claim 1 to be in close contact with the inner diameter side of the metal tube.