KR20000066508A - Apparatus for sticking pipes in an apparatus for producing composite pipe - Google Patents

Abstract

PURPOSE: A bonding device in a composite pipe producing apparatus is provided to arrest the defectiveness of a composite pipe by tightly bonding a plastic pipe and a metal pipe and to increase productivity with a simple structure. CONSTITUTION: A metal pipe(Mp) is drawn to bond with the circumference of an inner plastic pipe(Ip) with the shrunk inner diameter. In this state, the bonded pipes pass through a heating case(203) and an adhesive(A) is molten inside. The metal pipe is installed in the opening of the heating case and passes through a coil(204) flowing a high frequency current. Due to a magnetic field from the coil, the metal pipe generates heat and the adhesive is molten to tightly bond the metal pipe and the inner plastic pipe.

Description

Apparatus for sticking pipes in an apparatus for producing composite pipe

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a joining apparatus for producing a composite pipe, and more particularly, to heating a joining apparatus for heating a plastic pipe and a metal pipe in an airtight manner.

The composite pipe refers to a pipe in which the plastic pipe and the metal pipe are composed of two or three layers.

The conventional composite pipe manufacturing system will be described in detail with reference to the manufacturing system block diagram of FIG. 1.

First, look at the molding apparatus for molding the inner plastic pipe,

Plastic pipe forming means (1) for extruding plastic by an extruder to form an inner plastic pipe (Ip), and cooling means for cooling the inner plastic pipe (Ip) obtained by the plastic pipe forming means (1) by a cooler. (2), a drawing means (3) for pulling the inner plastic pipe (Ip) cooled by the cooling means (2) by a drawer, and an inner plastic pipe (Ip) drawn by the drawing means (3). It consists of a winding means 4 wound around a winding roll by a winding machine.

The plastic pipe supply means 5 for supplying the inner plastic pipe Ip wound around the roll by the winding means 4 to the pipe molding machine and the inner plastic pipe Ip by the plastic pipe supply means 5. When supplying the adhesive (A) to the outside when supplying), and wrapped around the outside of the inner plastic pipe (Ip) the metal strip (Ms) wound on the winding roll in order to form a low metal pipe (Mp) Metal band feeding means 6 for loosening and supplying the metal band feeding means 6 to be supplied to the pipe forming machine and the metal band Ms supplied by the metal band feeding means 6 to be gradually curved by the roll R to form a circular shape. The metal wave (Mp) is formed by means of the means (7) and the metal band bending means (7) so that the metal pipe (Mp) is formed at the periphery of the inner plastic pipe (Ip) coated with the adhesive (A) while forming a bottom pipe shape. Loop consists of a molding means (8).

As such, the metal pipe Mp is formed on the periphery of the inner plastic pipe Ip by the forming means 8 of the metal pipe Mp, wherein the metal pipe Mp is formed on the inner plastic pipe Ip. Cutting means 9 for cutting both end surfaces of the metal strip Ms with a slit so that it is easy to butt weld both end surfaces of the metal strip Ms so that the metal sheet Ms is in close contact with each other, and the metal cut by the cutting means 9 Butt welding means (10) for welding the butt parts after butting both sides of the strip (Ms), and the outer plastic pipe (Op) by an extruder on the metal pipe (Mp) formed by the welding means (10) Outer plastic pipe forming means (11) for shaping by means of an extruder, and composite pipe winding means (12) for winding the composite pipe (Cp) obtained by the outer plastic pipe forming means (11) on a take-up roll. .

The composite pipe Cp is a three-layer structure consisting of an inner plastic pipe Ip, a metal pipe Mp, and an outer plastic pipe Op, and the metal pipe Mp is aluminum.

Then, the adhesive (A) is melted by applying a preheating portion (H1) for firstly applying heat to the pipe formed by the welding means (10) and the composite pipe (Cp) formed by the forming means (11). The heating unit H2 is configured to heat the inner plastic pipe Ip, the metal pipe Mp, and the outer plastic pipe Op to be hermetically sealed.

The configuration of the preheating unit H1 and the heating unit H2 is the same as that of FIG. 2.

A heating box 23 formed with an inlet 21 and an outlet 22 through which pipes are conveyed is formed, and inside the heating box 23, a heater 24 is wound around a guide tube 25. The hot air inlet 27 is formed so that the hot air heated by the heater 24 is introduced into the guide tube 25 by the hot air fan 26, and the hot air is guided by the hot air fan 26. The guide port (28) flowing into the) was configured at both ends of the guide tube (25).

Thus, in order to join the metal pipe Mp and the inner plastic pipe Ip, the structure of the preheating part H1 and the heating part H2 for melting the adhesive A is complicated, and the preheating part H1 and Since the heating part H2 was each comprised, there was a problem that the apparatus became large.

Since the heat generated by the heater 24 is introduced into the guide tube 25 by the hot air blower 26, the metal pipe Mp passing through the guide tube 25 is indirectly heated by radiant heat. There was a problem of ineffective effect.

Therefore, a problem arises in that the electricity consumption increases because the heating time becomes longer.

The present invention is to solve this problem, the inner side of the inner plastic pipe formed by the extruder to be bent by a guide groove formed in the die metal band supplied to form the metal pipe gradually formed in the cross section inside Metal pipe forming means for forming the metal pipe on the periphery of the plastic pipe, the metal pipe forming means by the forming means of the metal pipe butt welded on both sides of the metal strip to maintain the state of the metal pipe formed on the periphery of the inner plastic pipe By butt welding by means, but in a state where both ends of the metal strip are butt welded by the welding means, as the inner diameter of the metal pipe is reduced by drawing the metal pipe so that the formed metal pipe is brought into close contact with the periphery of the inner plastic pipe. Metal pipe Metal pipe drawing means to be in close contact with the stick pipe and the outer plastic pipe forming means for forming the outer plastic pipe by the extruder on the outer periphery of the metal pipe in a state in which the metal pipe is in close contact with the inner plastic pipe by the drawing means Due to this, the plastic pipe and the metal pipe to be in close contact with each other to prevent the occurrence of defects in manufacturing the composite pipe, and to achieve the purpose of improving the productivity by simplifying the structure.

In addition, the manufacturing method of the composite pipe according to the present invention is gradually bent by a guide groove formed in the die of the metal strip supplied to form the metal pipe on the periphery of the inner plastic pipe formed by the extruder, the cross section is circular A metal pipe forming step of forming a metal pipe at the periphery of the inner plastic pipe, and a welding process for butt welding both end surfaces of the metal strip to maintain the metal pipe formed at the periphery of the inner plastic pipe by the forming step of the metal pipe. In the step of welding the two end faces of the metal bands by the welding step, the metal pipes are drawn as the inner diameter of the metal pipes is reduced by drawing the metal pipes so that the molded metal pipes are brought into close contact with the periphery of the inner plastic pipes. Even if it adheres to the outer diameter of the inner plastic pipe A metal pipe drawing step, and an external plastic pipe forming step of forming an external plastic pipe by an extruder on the outer periphery of the metal pipe in a state in which the metal pipe is in close contact with the internal plastic pipe by the drawing step. The purpose is to ensure that the metal pipes are well adhered to the inner plastic pipe and are hermetically bonded.

1 is a block diagram of a system for manufacturing a conventional composite pipe.

2 is a cross-sectional view of a heating box for heating a metal tube in a conventional apparatus for producing a composite pipe.

Figure 3 is an enlarged cross-sectional view of the main portion of the heating box of Figure 2;

Figure 4 is a cross-sectional view of the heating box for heating the metal tube in the apparatus for producing a composite pipe of the present invention.

5 is a side view of the heating box of FIG. 4;

6 illustrates a magnetic field generated by a coil mounted in a heating box.

*** Explanation of symbols for main parts of drawing ***

8: metal pipe forming means 10: welding means

201: entrance 202: exit

203: coil 204: heating box

Ip: Inner plastic pipe Ms: Metal strip

Mp: Metal Pipe Op: External Plastic Pipe

Referring to the accompanying drawings an embodiment of the present invention in detail as follows.

It is molded by the inner plastic pipe forming means (1) for extruding plastic by an extruder to form the inner plastic pipe (Ip), the inner plastic pipe (Ip) formed by the forming means (1) is a metal pipe to be described later It is molded into one of cross-linked polyethylene and high density polyethylene as a material which blocks air to prevent oxidation and damage of (Mp).

Cooling means (2) for cooling the inner plastic pipe (Ip) obtained by the inner plastic pipe forming means (1) by a cooler, and the inner plastic pipe (Ip) cooled by the cooling means (2) to a drawer. It is composed of a drawing means (3) to be pulled by, and a winding means (4) to wind the inner plastic pipe (Ip) pulled by the drawing means (3) to a take-up roll by a winding machine.

The inner plastic pipe supply means 5 for supplying the inner plastic pipe Ip wound around the roll by the winding means 4 to the pipe molding machine and the inner plastic pipe Ip by the inner plastic pipe supply means. When supplying the adhesive by applying the adhesive (A) to the outside, and wrapped around the outside of the inner plastic pipe (Ip) to loosen the metal strip (Ms) wound on the winding roll in order to form a low metal pipe (Mp) pipe The metal strip Ms is an aluminum plate, and is composed of a metal strip supply means 6 for supplying the metal strip Ms, and is supplied by the metal strip supply means 6. A metal pipe forming means (8) for forming a metal pipe (Mp) at the periphery of the inner plastic pipe (Ip) with the adhesive (A) coated on the inner plastic pipe (Ip) while bending (Ms);

Both end surfaces of the metal strip Ms are faced to each other so that the metal pipe Mp is formed on the periphery of the inner plastic pipe Ip by the forming means 8 of the metal pipe Mp, and then butt welded by a welder. Butt welding means 10 for welding the part, but in the state of butt welding the both ends of the metal strip (Ms) by the welding means 10 by drawing the molded metal pipe (Mp) to the internal plastic pipe ( By the outer plastic pipe forming means 110 for forming the outer plastic pipe (Op) by the extruder on the outer periphery of the metal pipe (Mp) in close contact with Ip), by the outer plastic pipe forming means (11) In the structure consisting of a composite pipe winding means 12 for winding up the molded composite pipe (Cp) to the take-up roll,

The metal pipe Mp is drawn by the drawing means and heat is generated in the metal pipe Mp by a magnetic field leaked at a high frequency current through the metal pipe Mp, which is in close contact with the inner plastic pipe Ip. In order to melt, the coil 204 through which a high frequency current flows is incorporated in the heating box 203 in which the inlet 201 through which the metal tube Mp enters and the outlet 202 discharged in a heated state are formed.

Both ends of the coil 204 are fixed to the terminal box 205 and the connection terminal 206 is configured at the tip of the coil 204.

In another embodiment, a heating box 203 having a coil 204 embedded therein may be provided next to the outer plastic forming means 11 so as to pass through the composite pipe Cp formed in the outer plastic pipe forming means 11. Can be.

Referring to the operation of the bonding device of the present invention configured as described above is as follows.

The inner plastic pipe (Ip) formed by the inner plastic pipe forming means (1) for extruding the plastic by an extruder to form the inner plastic pipe (Ip) is cooled by a cooler, which is a cooling means (2), and cooled as described above. The inner plastic pipe Ip is pulled by the drawer which is the drawing means 3 and wound around the take-up roll by the winder which is the winding means 4.

In this way, the inner plastic pipe (Ip) wound on the take-up roll by the winding means (4) is moved to the metal pipe forming means (8), and the metal strip (Ms) wound on the roll is released to remove the metal pipe forming means. Move to (8).

The metal pipe Mp is formed by the metal pipe forming means 8 at the periphery of the inner plastic pipe Ip supplied as described above.

In addition, the butt portion is formed by opposing both end surfaces of the metal strip Ms so as to maintain the metal pipe Mp formed on the circumference of the inner plastic pipe Ip by the forming means 107 of the metal pipe Mp. Is welded by the welding means (10).

As described above, the metal pipe Mp formed by the welding means 10 draws the metal pipe Mp so that the metal pipe Mp is brought into close contact with the circumference of the inner plastic pipe Ip. The pipe Mp is brought into close contact with the inner plastic pipe Ip.

As described above, while the metal pipe Mp is in close contact with the inner plastic pipe Ip, the adhesive A is melted while passing through the heating box 203 to thereby closely bond the plastic pipe and the metal pipe.

As described above, the metal pipe Mp is mounted in the heating box 203 through the inlet 201 of the heating box 203 and passes through the coil 204 through which the high frequency current flows. Heat is generated in the metal pipe Mp by the magnetic field leaked from 204.

Therefore, the adhesive A is melted by the heat generated from the metal pipe Mp, so that the metal pipe Mp and the inner plastic pipe Ip are closely bonded.

As the metal pipe Mp is in close contact with the inner plastic pipe Ip while passing through the heating box 203 as described above, the plastic is extruded on the outer periphery of the metal pipe Mp by an extruder to make the outer plastic pipe Op. ), The composite pipe Cp is formed.

In another method, when the composite pipe Cp formed with the outer plastic pipe Op is heated at the periphery of the metal tube Mp, the adhesive A is melted to bond the plastic pipe to the metal pipe. This can be done closely.

Then, the composite pipe (Cp) formed by the outer plastic pipe forming means 11 is wound on a take-up roll.

In this way, the composite pipe is wound on a roll by a winding means or cut into a predetermined length by a cutting means.

As described above, in the apparatus for manufacturing a composite pipe according to the present invention, the bonding apparatus has a simple configuration of a heating box, which can reduce the length of the apparatus much more conventionally, and is a method of directly heating rather than indirectly transferring heat. Excellent heating effect.

In addition, it is possible to adjust the heating time and temperature conditions in a timely manner as well as to precisely control the heating time, and to reduce the electricity consumption by shortening the heating time, and because the heat is generated directly from the metal pipe, the adhesion state is good. It is a useful invention that does not need to change parts frequently because of its long life.

Claims (2)

Feeding means for supplying the inner plastic pipe (Ip) formed by the extruder wound on the roll and the metal strip (Ms) wound on the roll to the metal pipe molding machine, and the metal strip (Ms) supplied by the supply means die Metal pipe forming means for forming the metal pipe Mp while surrounding the inner plastic pipe Ip supplied by (D), and the metal strip Ms so that the metal pipe Mp is formed by the metal pipe forming means. Welding means for welding both end surfaces of the side by a welding machine, and the metal pipe Mp formed by the welding means is pulled by the caterpillar to pass through the drawing member so as to be in close contact with the main surface of the inner plastic pipe Ip. The metal pipe drawing means for drawing the pipe Mp and the metal pipe Mp formed by the metal pipe drawing means are drawn while drawing to draw the inner plastic pipe Ip. According to which such a metal pipe (Mp) on the outer plastic pipe (Op) in a close contact with the molding by an extruder, The metal pipe Mp is drawn by the drawing means and heat is generated in the metal pipe Mp by a magnetic field leaked at a high frequency current through the metal pipe Mp, which is in close contact with the inner plastic pipe Ip. In order to be melted, a coil 204 through which a high frequency current flows is incorporated in a heating box 203 in which an inlet 201 through which the metal tube Mp enters and an outlet 202 discharged in a heated state are formed. Joining apparatus in the manufacturing apparatus of a composite pipe. The method of claim 1, And a heating box 203 having a coil 204 embedded therein so as to pass the composite pipe Cp formed to the outer plastic pipe forming means 11 next to the outer plastic forming means 11. Joining apparatus in pipe manufacturing apparatus.