Description

APPARATUS AND METHOD FOR MANUFACTURING

COMPOSITION PIPE

Technical Field

[1] The present invention relates to an apparatus and method for manufacturing a composition pipe. Background Art

[2] Generally, a composition pipe is manufactured by lining with a resin pipe the inner surface of a metallic pipe that a fluid flows. As an example of a method for manufacturing a composition pipe, Korean Patent No. 0446197 discloses a "Method for Manufacturing Combination Pipe using Polyolefine". According to the above publication, as illustrated in FIG. 21, the method comprises the first operation (Sl) of forming a synthetic resin pipe in a double structure in which an adhesive resin and polyethylene are combined, the second operation (S2) of picking-up the synthetic resin pipe and inserting it into a metallic pipe, the third operation (S3) of heating the metallic pipe using a radio frequency induction heating means so that the adhesive resin of the synthetic resin pipe is heated up to a softening point temperature, and the fourth operation (S4) of inhaling the air between an internal surface of the metallic pipe and an external surface of the synthetic resin pipe using an air inhaler to be in a vacuum state so that the metallic pipe and the synthetic resin pipe are stably closely adhered to each other, wherein an external layer of the synthetic resin pipe is formed of the adhesive resin of polyolefine. Disclosure of Invention Technical Problem

[3] A combination pipe, such that the internal surface or internal and external surfaces of the metallic pipe is lined with a resin, is connected to other pipe(s) by using a flange. In this case, due to the difficulty of a resin lining process, methods such as powder coating and coal tar painting and only a simply lining pipe (in which the liner pipe and the host pipe are not integrated) are generally used so that the proper lining method with a polyethylene resin having excellent corrosion-resisting property and chemical-resisting property and low prices is not introduced. As a result, there are hygienic problems such as corrosion of a pipe path and flow-out into a fluid.

[4] Further, as a method for preventing corrosion of a steel pipe, polyethylene powder coating on the steel pipe has been mainly used, even though its durability is limited. Another lining method for small-diameter pipes involves inserting a polyethylene pipe into a steel pipes and lining the polyethylene pipe by using an air pressure.

[5] However, as the possible leakage of the air pressure, a danger for a safety accident and ineffective processes, would lower productivity, the method could not be applied to a large-diameter pipe. Technical Solution

[6] According to an aspect of the present invention, there is provided a method for manufacturing a composition pipe, the method comprising: (a) preparing each of a metallic pipe and a resin pipe having the length longer than the metallic pipe; (b) inserting the resin pipe into the metallic pipe; (c) heating the metallic pipe and the resin pipe and adhering the resin pipe to an internal surface of the metallic pipe to manufacture a composition pipe; (d) expanding both ends of the resin pipe protruded from the metallic pipe to form a flange portion; (e) adhering the flange portion to the metallic pipe; and (f) cooling the composition pipe.

[7] (a) may comprise preparing the metallic pipe by smoothing a shape of a welding bead and by blasting processing on its surface.

[8] (a) may comprise preparing the metallic pipe by epoxy coating on its internal surface.

[9] Between (a) and (b), the method may further comprise (g) recovering waste heat and preheating the metallic pipe and the resin pipe.

[10] (c) may comprise adhering the resin pipe to an internal surface of the metallic pipe by pressurizing an internal surface of the resin pipe using a pressurizing roller.

[11] (c) may comprise adhering the resin pipe to the internal surface of the metallic pipe by removing the air between the metallic pipe and the resin pipe.

[12] Between (c) and (d), the method may further comprise: (h) preparing an external resin pipe; (i) inserting the composition pipe into the external resin pipe; and (J) heating the external resin pipe and the composition pipe and adhering the external resin pipe to an external surface of the metallic pipe.

[13] Between (c) and (d), the method may further comprise (k) plating or painting the external surface of the metallic pipe.

[14] According to another aspect of the present invention, there is provided an apparatus for manufacturing a composition pipe, the apparatus comprising: a supply unit supplying each of a metallic pipe and a resin pipe; a transfer unit disposed at one side of the supply unit, inserting the resin pipe into the metallic pipe supplied by the supply unit and transferring the resin pipe; a heating unit disposed at one side of the transfer unit and heating the metallic pipe and the resin pipe; a composition pipe adhering unit disposed at one side of the heating unit and adhering the internal surface of the metallic pipe and the resin pipe to manufacture a composition pipe; a pipe-expanding unit disposed at one side of the heating unit and expanding both ends of the composition

pipe to form a flange portion; and a flange portion adhering unit disposed at one side of the pipe-expanding unit and adhering the flange portion.

[15] The heating unit may comprise: a rotating member disposed under the metallic pipe and rotating the metallic pipe; a height adjusting member disposed under the rotating member and adjusting the height of the rotating member; a heating member disposed at both sides of the metallic pipe and heating the metallic pipe and a resin pipe inserted into the metallic pipe together; and an adiabatic member disposed to surround the heating member and an upper portion of the metallic pipe and being conducive to insulation, wherein the composition pipe adhering unit comprises: a first pressurizing roller member comprising a first pressurizing roller which is disposed inside the resin pipe, contacts an internal surface of the resin pipe and applies the resin pipe in a radius direction; and a first movement means which is connected to the first pressurizing roller member and moves the first pressurizing roller member in a radius direction of the resin pipe.

[16] The heating unit may comprise: a rotating member disposed under the metallic pipe and rotating the metallic pipe; a height adjusting member disposed under the rotating member and adjusting the height of the rotating member; a heating member disposed at both sides of the metallic pipe and heating the metallic pipe and a resin pipe inserted into the metallic pipe together; and an adiabatic member disposed to surround the heating member and an upper portion of the metallic pipe and being conducive to insulation. The composition pipe adhering unit comprises: a second pressurizing roller member comprising a tool post which is disposed inside the resin pipe, a plurality of second pressurizing rollers which are disposed in a radial shape around the tool post and contact the internal surface of the resin pipe, and a second movement means which is connected to the second pressurizing roller and the tool post and moves the second pressurizing roller in a radius direction of the resin pipe from the tool post; and a transfer member which is disposed at one side of the second pressurizing roller member and transfers the second pressurizing roller member in the lengthwise direction of the resin pipe.

[17] The rotating member may comprise a plurality of rotating rollers which contact the external surface of the metallic pipe, a roller support portion which supports the rotating rollers so that the rotating roller can be rotated, and a direction converting portion disposed to convert the direction of the roller support portion. The height adjusting member comprises a stand which supports the direction converting portion and an adjusting means which is connected to the stand and adjusts the height of the stand. The heating member comprises a stack portion in which a plurality of seating portions disposed to be perpendicular to sides of the metallic pipe and stacked, are formed, heating coils seated in the seating portions, a movement portion disposed

under the stack portion and allowing the stack portion to be easily moved, and a movement means disposed at one side of the stack portion and moving the stack portion right and left. The adiabatic member comprises a thermal reflecting mirror disposed to surround upper portions of the stack portion and the metallic pipe, a fireproof block disposed to surround the thermal reflecting mirror, a thermal reflection adiabatic material disposed to surround the fireproof block, and a heat-retaining adiabatic material disposed to surround the thermal reflection adiabatic materials.

[18] A rotating shaft of the first pressurizing roller may be positioned on a straight line which connects a rotating shaft of each of the rotating rollers with a central axis of the resin pipe.

[19] The apparatus may further comprise an auxiliary roller member comprising roller portions which are disposed respectively in front of and in rear of the second pressurizing roller member and contact the internal surface of the resin pipe. The auxiliary roller member is connected to the transfer member and is moved by the transfer member in the lengthwise direction of the resin pipe.

[20] The composition pipe adhering unit may comprise: sealing members which are disposed at ends of the metallic pipe and the resin pipe and seal the internal surface of the resin pipe; a pressing means which is inserted into the resin pipe and applies a predetermined pressure to the internal surface of the resin pipe so that the resin pipe can be closely contacted with the internal side of the metallic pipe; and a vacuum inhalation means which is disposed at one side of the sealing member and inhales the air between the metallic pipe and the resin pipe, and the heating unit is a heating means disposed outside the metallic pipe.

[21] The pressing means may comprise: a hollow pipe portion which is inserted into the resin pipe and in which an air-ejecting hole is formed, an air transfer pipe which is connected to the air-ejecting hole and a pressurizing means which is connected to the air transfer pipe and applies a predetermined pressure to the internal surface of the resin pipe.

[22] The pipe-expanding unit may comprise a plurality of pipe-expanding members which are disposed at one side of the resin pipe and expand the composition pipe and a pipe-expanding transfer member which is connected to the pipe-expanding members and transfers the pipe-expanding members.

[23] The plurality of pipe-expanding members may comprise: a support disposed at one side of the flange portion; a plurality of third movement means which are fixed at the support and can be moved in the lengthwise direction of the composition pipe; a pipe- expanding portion comprising a bracket being connected to one end of the third movement means so as to make it possible to hinge and a pipe-expanding roller being connected to the bracket so as to make it possible to rotate; a gap adjusting means

being connected to the bracket and the support so as to make it possible to hinge and adjusts a distance between the bracket and the support, and the pipe-expanding transfer member comprises: a frame in which the plurality of pipe-expanding members are disposed in a radial shape; a fourth movement means which is disposed at the frame and moves the pipe-expanding members so that a distance between the center of the pipe-expanding member and the frame can be adjusted; and a fifth movement means which is connected to the frame and moves the frame in the lengthwise direction of the composition pipe.

[24] The apparatus may further comprise a first heating means which is disposed at the outside of the flange portion to surround the flange portion and heats the flange portion.

[25] The pipe-expanding roller may be configured to have a conical shape.

[26] The flange portion adhering unit may comprise: a pressure plate which contacts the flange portion; and a sixth movement means which is connected to the pressure plate and transfers the pressure plate in the lengthwise direction of the composition pipe.

[27] The apparatus may further comprise a second heating means which is disposed at the outside of the flange portion to surround the flange portion and heats the flange portion.

[28] Heating coils may be provided on a surface with which the flange portion of the pressure plate is in contact, and a radio frequency heating portion is provided on a surface with which the flange portion of the pressure plate is in contact.

Advantageous Effects

[29] Firstly, adhesion of a resin pipe having excellent corrosion-resisting property and chemical stability and relatively low prices to a metallic pipe can be easily applied to a large-diameter pipe and a flange portion formed of a resin can be easily formed a composition pipe.

[30] Secondly, preheating system, using waste heat in a transfer unit which transfers the metallic pipe in which a preparation procedure is completed to the heating unit, enables energy to be effectively used in the manufacture of the composition pipe which needs a large amount of energy so as to save the energy and to reduce heating time.

[31] Thirdly, as the heating unit applies heat directly, the heating time is reduced compared to such a conventional heating method as to use the air as a medium, and the adhesion process is properly performed as heat transfer using radiation allows uniform heating.

[32] Furthermore, the heating member of the heating unit is movable and reduces a heating space and comprises a thermal reflecting mirror so that the heat of the air that is heated and moved upwards is reflected and is used as radiant heat. In addition,

internal heat is prevented by an adiabatic member from being moved to the outside so as to minimize the loss of energy. And, as absorption heat of the metallic pipe and the resin pipe is increased, and the heating operation is uniformly performed , quality is to be improved.

[33] Fourthly, a pressurizing operation is performed using the pressurizing roller of the composition pipe adhering unit so that : as the range of pressurization is clear and the pressurizing operation is locally and sequentially performed, the air between the metallic pipe and the resin pipe is easily discharged; the quality of a composition pipe to be manufactured is improved; and a convenient and continuous adhering process is workable since provision of the transfer member for transferring the pressurizing roller make it possible to perform adhering process with the pressurizing roller.

[34] Furthermore, the use of a hollow pipe portion of the composition pipe adhering unit may reduce the danger of accident caused by air pressure is reduced and time required for charging the air in the composition pipe.

[35] Fifthly, automatic pipe-expanding process using a pipe-expanding unit makes the operation efficient and stress in the resin pipe is reduced when the pipe-expanding operation is performed so that the uniformity of quality is achieved.

[36] While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. Brief Description of the Drawings

[37] FIG. 1 is a flowchart illustrating a method for manufacturing a composition pipe according to an embodiment of the present invention.

[38] FIG. 2 is a flowchart illustrating a method for manufacturing a composition pipe according to another embodiment of the present invention.

[39] FIG. 3 is a flowchart illustrating a method for manufacturing a composition pipe according to another embodiment of the present invention.

[40] FIG. 4 is a schematic view of an apparatus for manufacturing a composition pipe according to an embodiment of the present invention.

[41 ] FIG. 5 illustrates a heating unit of FIG. 4.

[42] FIGS. 6 through 8 illustrate the operation of a rotating roller of FIG. 5.

[43] FIGS. 9 and 10 are a front view and a side view of a composition pipe adhering unit of FIG. 4 according to an embodiment of the present invention.

[44] FIGS. 11 and 12 are a front view and a side sectional view of a composition pipe adhering unit of FIG. 4 according to another embodiment of the present invention.

[45] FIG. 13 is a sectional view of a composition pipe adhering unit of FIG. 4 according to another embodiment of the present invention.

[46] FIGS. 14 and 15 are a side sectional view and a front view of a pipe-expanding unit of FIG. 4.

[47] FIG. 16 illustrates the operation of the pipe-expanding unit of FIGS. 14 and 15.

[48] FIG. 17 is a sectional view of a flange portion adhering unit of FIG. 4.

[49] FIGS. 18 through 20 are sectional views of a composition pipe having various shapes that can be manufactured according to the present invention.

[50] FIG. 21 is a flowchart illustrating a conventional method for manufacturing a composition pipe. Mode for the Invention

[51] A method for manufacturing a composition pipe according to an embodiment of the present invention comprises the following operations. FIG. 1 is a flowchart illustrating a method for manufacturing a composition pipe according to an embodiment of the present invention.

[52] Reference is made to FIG. 1, firstly, each of a metallic pipe and a resin pipe is to be prepared (operation a). In this case, the metallic pipe may be prepared as a metallic pipe a rim of which both ends are flared and rim-formed according to the shape of a composition pipe to be manufactured and may also be prepared with epoxy coated on its internal surface. The resin pipe may be longer than the metallic pipe. As a conventional method for manufacturing a resin pipe, the resin pipe is manufactured by extruding, through a die, two kinds of resins kneaded in a whole, of which the adhesive resin kneaded separately is fed on to the outer circumference of the principal material resin while it is kneading. As an example of the resin pipe, a polyethylene, polybutylene or polypropylene resin pipe may be used.

[53] In the operation a, it is preferable to prepare a metallic pipe whose surface is blasting processed by using a high-hardness blast material so as to improve the adhesion property of a resin.

[54] In addition, since a large-diameter pipe is generally manufactured by welding, it is preferable to prepare the metallic pipe with shapes of welding beads existing on its inside or outside being smoothed in proper shape. The reasons are as follows: since a rapid change in sections of the metallic pipe due to the protruding welding beads compared to a pipe path causes the degradation of quality like that an air layer remains between the resin pipe and the metallic pipe when being adhered with the resin pipe and even after the adhering operation, the air layer remains due to a restoring deformation force of the resin pipe, it is preferable that the shape of the welding bead is corrected by compressing the welding bead using a compression roller etc. or by

making a change in sections of the metallic pipe by grinding and cutting be smooth.

The shape of the welding bead must be smoothed within a range in which distortion does not occur without lowering the efficiency of welding joint. [55] Next, the resin pipe is inserted into the metallic pipe (operation b). In the operation b, when a flange portion is formed at both ends of the composition pipe according to an embodiment, the resin pipe is inserted into the metallic pipe in such a way that the resin pipe may be protruded from both ends of the metallic pipe, and when the flange portion is formed at only one end of the composition pipe, the resin pipe is inserted into the metallic pipe in such a way that the resin pipe may be protruded from one end of the metallic pipe. [56] Next, the composition pipe is manufactured by heating the metallic pipe and the resin pipe and by adhering the resin pipe on the internal surface of the metallic pipe

(operation c). [57] Heating is made by using combustion heat of a clean gas such as a liquefied petroleum gas (LPG) or city gas or electrical resistance heat or radio frequency or the like. [58] The resin pipe may be adhered to the internal surface of the metallic pipe by pressurizing the internal surface of the resin pipe with a pressurizing roller and by removing the air between the metallic pipe and the resin pipe. [59] Next, both ends of the resin pipe protruded from the metallic pipe are expanded to form a flange portion (operation d). [60] Next, the flange portion is adhered to the metallic pipe (operation e). The flange portion may be adhered to the metallic pipe by pressurizing the flange portion with a pressurizing roller. [61] Next, the manufacture of the composition pipe is completed with cooling (operation f).

[62] It is preferable that, between the operations a and b, the process may further comprise operation g of recovering waste heat and pre-heating the metallic pipe and the resin pipe.

[63] The composition pipe manufactured by the method is as illustrated in (a), (b) and

(c) of FIG. 18. The composition pipe in which a resin pipe 200 is manufactured according to the length protruded from a metallic pipe 100 may be changed, as illustrated in (a), (b) and (c) of FIG. 18. In addition, a hole 210a may be perforated into a flange portion 210 of the manufactured composition pipe, as illustrated in (b) of FIG. 18.

[64] A method for manufacturing a composition pipe according to another embodiment of the present invention comprises the following operations. FIG. 2 is a flowchart illustrating a method for manufacturing a composition pipe according to another

embodiment of the present invention. In FIG. 2, the same operations as those of FIG. 1 denote like reference numerals and a description of the same operations will be omitted or simplified.

[65] Referring to FIG. 2, firstly, each of a metallic pipe and a resin pipe is prepared

(operation a). In this case, the metallic pipe may be prepared as a metallic pipe in which a rim of which both ends are bent is formed according to the shape of a composition pipe to be manufactured and may also be prepared with epoxy coated on an internal surface of the metallic pipe. The resin pipe may be longer than the metallic pipe.

[66] Next, the metallic pipe and the resin pipe are pre-heated by recovering waste heat generated during a composition pipe manufacturing process (operation g). The operation is a simple objective for recycling an energy by recovering heat that is generated during the process and is not used and by pre-heating the metallic pipe and the resin pipe. Thus, it is effective that the operation g may be performed while the metallic pipe and the resin pipe are transferred to a next operation.

[67] Next, the resin pipe is inserted into the metallic pipe so that both ends of the resin pipe may be protruded from both ends of the metallic pipe (operation b).

[68] Next, the composition pipe is manufactured by heating the metallic pipe and the resin pipe and by adhering the resin pipe on the internal surface of the metallic pipe (operation c).

[69] Next, an external resin pipe is prepared (operation h). The external resin pipe may be prepared as an external resin pipe in which a rim of which both ends are bent is formed according to the shape of a composition pipe to be manufactured. It is preferable that the shape of the external resin pipe may be the same as the shape of the metallic pipe because the external surface of the metallic pipe is able to be protected.

[70] Next, the composition pipe is inserted into the external resin pipe (operation i).

[71] Next, the external resin pipe and the composition pipe are heated and the external resin pipe is adhered on the external surface of the metallic pipe (operation j). The external resin pipe may be adhered by pressurizing the internal surface of the resin pipe using a pressurizing roller or by removing the air between the metallic pipe and the resin pipe, as described above.

[72] Subsequent operation d of forming a flange portion, operation e of adhering the flange portion and operation f of cooling the composition pipe are the same as those of FIG. 1 and thus, a detailed description thereof will be omitted.

[73] The composition pipe manufactured by the method is as illustrated in (a) and (b) of

FIG. 19. The composition pipe that is manufactured according to the length at which a resin pipe 200 is protruded from a metallic pipe 100 and the shapes of the metallic pipe 100 and the external resin pipe 300 may be changed, as illustrated in (a) and (b) of

FIG. 19.

[74] A method for manufacturing a composition pipe according to another embodiment of the present invention comprises the following operations. FIG. 3 is a flow a flowchart illustrating a method for manufacturing a composition pipe according to another embodiment of the present invention. In FIG. 3, the same operations as those of FIGS. 1 and 2 denote like reference numerals and a description of the same operations will be omitted or simplified.

[75] Operations a through c are the same as those of FIG. 1.

[76] After operation c, the external surface of the composition pipe is plated or painted

(operation k).

[77] Subsequent operation d of forming a flange portion, operation e of adhering the flange portion and operation f of cooling the composition pipe are the same as those of FIG. 1 and thus, a detailed description thereof will be omitted.

[78] The composition pipe manufactured by the method is as illustrated in (a) and (b) of

FIG. 20. The composition pipe that is manufactured according to the length at which a resin pipe 200 is protruded from a metallic pipe 100 and the shape of the metallic pipe 100 may be changed, as illustrated in (a) and (b) of FIG. 20. For a reference, reference numeral 400 denotes a plated or painted portion.

[79] In particular, in case of the composition pipe illustrated in (a) of FIG. 20, the resin pipe 200 protruded from both ends of the metallic pipe 100 is expanded to be formed as a flange portion even in case of a metallic pipe of which rim is not formed so that a composition pipe in which both ends of the metallic pipe are not in contact with a fluid etc. when various kinds of joints are connected can be manufactured. Further, in case of the composition pipe illustrated in (b) of FIG. 20, a composition pipe in which a metallic pipe is completely shielded from a fluid etc. and is protected can be manufactured.

[80] In the drawings, illustrate the flange portion to be formed at both ends of the composition pipe. However, this represents only exemplary embodiment of the present invention and it is needless to say that the flange portion may be formed at only one end of the composition pipe.

[81] An apparatus for manufacturing a composition pipe according to an embodiment of the present invention will now be described.

[82] Referring to FIG. 4, the apparatus for manufacturing a composition pipe according to a preferrable embodiment of the present invention comprises a supply unit 10, a transfer unit 20, heating units 30 and 90, composition pipe adhering units 40, 50, 60, a pipe-expanding unit 70 and a flange portion adhering unit 80.

[83] The supply unit 10 supplies each of the metallic pipe 100 and the resin pipe 200 and the metallic pipe 100 is supplied with pre-treatment, smoothing the shape of a welding

bead and blasting processing of the surface of the metallic pipe 100, and the resin pipe 200 is supplied as a resin pipe having the length that is longer than the metallic pipe 100. Pre-treatment of the metallic pipe 100 may include acid-cleaning processing, oil removing and oxide film removing etc. and rim welding may be performed on the metallic pipe 100 according to the shape of a composition pipe to be manufactured.

[84] The transfer unit 20 is positioned at one side of the supply unit 10, inserts and transfers the resin pipe 200 into the metallic pipe 100 supplied by the supply unit 10.

[85] The metallic pipe 100 and the resin pipe 200 may be transferred by the transfer unit

20 to a pre-heating furnace 29 which recovers waste heat generated during process and pre-heats the use of the pre-heating furnace 29 is to attain a simple objective: to recycle an energy by recovered heat that is generated and not used during the process and is not used and by pre-heating the metallic pipe 100 and the resin pipe 200. Thus, the metallic pipe 100 and the resin pipe 200 may be preheated during the transferring process with the transfer unit 20 to the heating unit 30 without provision of an additional preheating furnace 29.

[86] The heating unit 30 is mounted at one side of the transfer unit 20 and heats the metallic pipe 100 and the resin pipe 200.

[87] As an example of the heating unit 30, as illustrated in FIG. 5, the heating unit 30 comprises a rotating member 31, a height adjusting member 33, a heating member 35 and an adiabatic member 37.

[88] The rotating member 31 is disposed under the metallic pipe 100 and comprises a plurality of rotating rollers 31a that contact the external surface of the metallic pipe 100 and has a long ball, a roller support portion 31b that supports the rotating rollers 31a so that the rotating roller 31a can be rotated, and a direction converting portion 31c disposed to convert the direction of the roller support portion 31b. The rotating member 31 rotates the metallic pipe 100.

[89] As The direction of the roller support portion 3 Ib can be converted by the direction converting portion 31c the direction of the rotating roller 31a supported by the roller support portion 31b can be rotated. The operation of the rotating rollers 31a will now be described.

[90] As illustrated in FIG. 6, when the shaft of each of the rotating rollers 3 Ia is parallel to the shaft of the metallic pipe 100, the metallic pipe 100 rotates on its own axis at the position. As illustrated in FIG. 7, when the shaft of each of the rotating rollers 31a is inclined at a predetermined angle, the metallic pipe 100 is rotated on its own axis and is moved forwards. Further, as illustrated in FIG. 8, when the shaft of each of the rotating rollers 31a is perpendicular to the shaft of the metallic pipe 100, the metallic pipe 100 is moved forwards or backwards according to the rotation direction of the rotating rollers 31b. Thus, rotation and movement of the metallic pipe 100 can be

controlled by changing the angle of a rotating shaft of the rotating rollers 31a in various ways.

[91] The height adjusting member 33 is disposed under the rotating member 31 and comprises a stand 33a that supports the direction converting portion 31c and an adjusting means 33b that is connected to the stand 33a and adjusts the height of the stand 33a. The height adjusting member 33 adjusts the height of the rotating member 31.

[92] In the present embodiment, the adjusting means 33b comprises a piston 33c and a cylinder 33d operate by hydraulic and pneumatic pressure, a pair of rods 33e that are connected to the piston 33c and operate according to extension of the piston 33c and are disposed across, a slider 33f that is disposed at the end of a rod , and a stopper 33g that prevents the movement of the slider 33f.

[93] In addition, a fireproof block 32a may be provided between the stand 33a and the direction converting portion 31c, and a groove is formed in the fireproof block 32a. A heating coil 32b for heating lower portions of the metallic pipe 100 and the resin pipe 200 is seated in the groove. Further, when a noncontact temperature sensor 32c is installed on the fireproof block 32a, the temperature of the metallic pipe 100 can be easily measured.

[94] The operation of the height adjusting member 33 having the above structure will now be described. The forward movement of the piston 33 makes the pair of rods 33e become closer to each other and move upwards so that the stand 33a moved upwards. After The height of the stand 33a is properly adjusted and the movement of the slider 33f is prevented by using the stopper 33g.

[95] The heating member 35 is disposed at both sides of the metallic pipe 100. The heating member 35 comprises a stack portion 35a in which a plurality of seating portions 35a disposed to be perpendicular to sides of the metallic pipe 10 and stacked, are formed, heating coils 35d seated in the seating portions 35a a movement portion 35e disposed under the stack portion 35a and allowing the stack portion 35a to be easily moved, and a movement means 35f disposed at one side of the stack portion 35a and moving the stack portion 35a right and left. The heating member 35 heats the metallic pipe 100 and the resin pipe 200 inserted into the metallic pipe 100.

[96] The stack portion 35a may be composed of a fireproof block, In the present embodiment, a pair of stack portions 35a are disposed at both sides of the metallic pipe 100. In addition, a thermal reflection adiabatic material 35b may be installed on a surface opposite to a surface on which the seating portions 35a of the stack portion 35a are formed, so as to increase radiant heat. When a steel frame 35c is installed to surround the external surface of the thermal reflection adiabatic material 35b, the stack portion 35a may withstand to its own weight effectively.

[97] In the present embodiment, the movement portion 35e comprises wheels disposed under the stack portion 35a.

[98] The movement means 35f may be disposed outside the adiabatic member 37 that will be described below. In the present embodiment, the movement means 35f comprises a cylinder and a piston that operate by hydraulic and pneumatic pressure.

[99] The heating member 35 having the above structure may widen or reduce a distance between the pair of stack portions 35a using the movement means 35f. Thus, the distance between the stack portions may be properly adjusted according to the size of the metallic pipe 100.

[100] In addition, each of the heating coils 35d may control supply of electricity so that unnecessary electricity of the heating coils 35d can be cut off according to the size of the metallic pipe 100.

[101] The adiabatic member 37 is disposed in an arch shape to surround upper portions of the heating member 35 and the metallic pipe 100. The adiabatic member 37 comprises a thermal reflecting mirror 37a disposed to surround upper portions of the stack portion 35a and the metallic pipe 100, a fireproof block 37b disposed to surround the thermal reflecting mirror 37a, a thermal reflection adiabatic material 37c disposed to surround the fireproof block 37b, and a heat-retaining adiabatic material 37d disposed to surround the thermal reflection adiabatic material 37c. The adiabatic member 37 is conducive to insulation. As described above, when the thermal reflecting mirror 37a is provided, the quantity of radiant heat is increased and uniform heating is performed so that an energy efficiency can be increased and a heating time can be reduced. In addition, a noncontact temperature sensor 39 which measures the temperature of the metallic pipe 100 may be provided on the arch-shaped adiabatic member 37.

[102] According to the heating unit 30 having the above structure, a space required for heating the metallic pipe 100 and the resin pipe 200 is minimized so that space can be reduced, and the metallic pipe 100 and the resin pipe 200 can be rapidly and uniformly heated with a minimum energy.

[103] On the other hand, the composition pipe adhering unit 40 is disposed at one side of the heating unit 30, and the composition pipe is manufactured by adhering the internal surface of the metallic pipe 100 and the external surface of the resin pipe 200.

[104] It is noteworthy that the composition pipe adhering units 40 and 50 according to embodiments of the present invention that will be described below are used in the state where the metallic pipe 100 and the resin pipe 200 are disposed in the heating unit 30.

[105] As an embodiment of the composition pipe adhering units, as illustrated in FIGS. 9 and 10, the composition pipe adhering unit 40 comprises a first pressurizing roller member 41 which includes a first pressurizing roller 42 that is disposed inside the resin pipe 200, contacts the internal surface of the resin pipe 200 and pressurizes the resin

pipe 200 in a radius direction, and a first movement means 45 which is connected to the first pressurizing roller member 41 and moves the first pressurizing roller member 41 in a radius direction of the resin pipe 200.

[106] In the present embodiment, the first movement means 45 comprises a cylinder 46 and a piston 47 that operate by hydraulic pressure generating means (not shown) comprising a motor, a hydraulic and pneumatic pump and a control valve. One end of the piston 47 may be connected to a rotating shaft 43 of the first pressurizing roller 42, and the first movement means 45 may be provided in front of and in rear of the first pressurizing roller rotating shaft 43, respectively.

[107] Here, the rotating shaft 43 of the first pressurizing roller 42 may be positioned on a straight line in which a rotating shaft 31a of each of the rotating rollers 31a and a central axis 200a of the resin pipe 200 are connected. This is because the composition pipe is prevented from being deformed or distorted by force of the first pressurizing roller 42.

[108] As described above, the metallic pipe 100 and the resin pipe 200 are pressurized by the first pressuring roller 42 of the composition pipe adhering unit 30 in the state where the metallic pipe 100 and the resin pipe 200 are heated by the heating unit 30 and the resin pipe 200 is softened so that a adhering process can be performed.

[109] As another embodiment of the composition pipe adhering unit, as illustrated in

FIGS. 11 and 12, the composition pipe adhering unit 50 comprises a second pressurizing roller member 51 and a transfer member 55.

[110] The composition pipe adhering unit 50 according to another embodiment of the present invention is suitable in case the metallic pipe 100 is long considering the diameter of the pipe or its internal surface is rugged and uneven. Notwithstanding, the present invention is not limited to this.

[I l l] As illustrated in FIG. 11, The second pressurizing roller member 51 comprises a tool post 52 which is disposed inside the resin pipe 200, a plurality of second pressurizing rollers 53 which are disposed in a radial shape around the tool post 52 and contact the internal surface of the resin pipe 200, and a second movement means 54 which is connected to the second pressurizing roller 53 and the tool post 52 and moves the second pressurizing roller 53 in a radius direction of the resin pipe 200 from the tool post 200.

[112] In the present embodiment, the second movement means 54 comprises a hydraulic and pneumatic cylinder 54a, a piston 54b which is connected to one end of the cylinder 54a and is retractile, and a distributor 54c which distributes hydraulic pressure or pneumatic pressure into each cylinder uniformly.

[113] In addition, in the present embodiment, the second pressurizing rollers 53 consists of three and is positioned to constitute a triangular shape. It is needless to say that this

is only an example of the embodiment and the second pressurizing roller 53 can be disposed in different forms of radial shape. As the second pressurizing roller 53 consists of three, the second movement means 54 which connects the second pressurizing rollers 53 and the tool post 52 consists of six and is positioned to constitute a triangular shape each other, the number of second movement means 54 may be changed according to the number of the second pressurizing roller 53. In the above structure, as the piston 54b of the second movement means 54 is extendable, a distance between the tool post 52 and of the second pressurizing rollers 53 is adjusted effectively according to the diameter of the resin pipe 200, and even when the internal surface of the pipe is rugged.

[114] As illustrated in FIG. 12, the transfer member 55 is disposed at one side of the second pressurizing roller member 51 and transfers the second pressurizing roller member 51 in the lengthwise direction of the resin pipe 200. In the present embodiment, the transfer member 55 comprises a cylinder 55a that operates by hydraulic or pneumatic pressure and a piston 55b combined with the cylinder 55a. The tool post 52 is connected to the piston 55b. In addition, it is desirable that the piston 55b of the transfer member 55 may be comprised of multi-steps so as to properly correspond to the length of the resin pipe 200.

[115] It is preferable that the composition pipe adhering unit 50 may further comprise an auxiliary roller member 57 comprising roller portions 57b which are disposed in front of and in rear of the second pressurizing roller member 51, respectively and contact the internal surface of the resin pipe 200. More preferably, the auxiliary roller member 57 may be connected to the piston 55b of the transfer member 55 and be moved by the piston 55b in the lengthwise direction of the resin pipe 200 together with the second pressurizing roller member 51.

[116] In the above structure, the auxiliary roller member 57 is connected in front of and in rear of the tool post 52 is connected to the piston 55b, so as to support the internal surface of the resin pipe 200, the piston 55b can be prevented from being bent.

[117] In the present embodiment, the auxiliary roller member 57 comprises a connecting portion 57a connected to the piston 55b and a pair of roller portions 57b connected to the connecting portion 57a and thus has a similar configuration as that of the second pressurizing roller member 51. The size of the roller portion 57b is the same as or greater than the size of the second pressurizing roller 53 so that the roller portion 57b plays an auxiliary role sufficiently. The number of the auxiliary roller members 57 is illustrated as two in the drawings but may be adjusted to the degree which the piston 55b is able to withstands.

[118] As another embodiment of the composition pipe adhering unit, as illustrated in FIG.

13, the composition pipe adhering unit 60 comprises sealing members 61 which are

disposed at ends of the metallic pipe 100 and the resin pipe 200 and seal the internal surface of the resin pipe 200, a pressing means 63 which is inserted into the resin pipe 200 and pressurizes a predetermined pressure to the internal surface of the resin pipe 200 so that the resin pipe 200 can be contacted with the internal side of the metallic pipe 200, and a vacuum inhalation means 65 which is disposed at one side of the sealing member 61 and inhales the air 900 between the metallic pipe 100 and the resin pipe 200.

[119] Here, the pressing means 63 may comprise a hollow pipe portion 63a which is inserted into the resin pipe 200 and in which an air-ejecting hole 63a is formed, an air transfer pipe 63b which is connected to the air-ejecting hole 63 and a pressurizing means (not shown) which is connected to the air transfer pipe 63b and pressurizes a predetermined pressure to the internal surface of the resin pipe 200. A pressure meter 63c, an opening and closing valve 63d and a rapid separation socket 63e may be installed at the air transfer pipe 63b. Although the pressurizing means is not shown, it may comprise a compressor, a moisture separator and an air pressure pipe.

[120] In the present embodiment, the sealing member 61 is installed at ends of the hollow pipe portion 63a, the metallic pipe 100 and the resin pipe 200 as one body. The sealing member 61 comprises a cover flange 61a having a heat-resistant packing 61b for preventing the pressure inside the hollow pipe portion 63a and the resin pipe 200 from leaking.

[121] In addition, the vacuum inhalation means 65 comprises a vacuum conduit 65a which perforates the cover flange 61a and is able to inhales the air 900 between the metallic pipe 100 and the resin pipe 200, a vacuum gage 65b installed at the vacuum conduit 65a, a vacuum chamber 65c, an opening and closing valve 65d and a rapid separation socket 65e installed at the end of the vacuum conduit 65a.

[122] In the above structure, when the opening and closing valve 63d is closed after it is pressurized by a predetermined pressure through the air-ejecting hole 63a of the hollow pipe portion 63a inserted into the resin pipe 200, the resin pipe 200 is in close contact with the internal surface of the metallic pipe 100 and the air 900 between the metallic pipe 100 and the resin pipe 200 is discharged through the vacuum conduit 65a by opening the opening and closing valve 65a so that the resin pipe 200 can be adhered to the internal surface of the metallic pipe 100.

[123] In case of the composition pipe adhering unit 60 of FIG. 13, the heating unit 90 may comprise a heating means disposed outside the metallic pipe 100. In the present embodiment, the heating means is an annular heating means. When the annular heating means is transferred toward the end from the center portion of the metallic pipe 100 and the resin pipe 200 are heated, heating is performed sequentially from the center portion and the air 900 between the resin pipe 200 and the metallic pipe 100 is

removed by the composition pipe adhering unit and the adhering operation is performed.

[124] On the other hand, the pipe-expanding unit 70 which will be described below may be used in the state where the composition pipe adhering units 40 and 50 of FIGS. 9 through 12 are removed and the composition pipe is disposed within the heating unit 30. In this case, the pipe-expanding unit 70 is disposed at one side of the heating unit 30.

[125] The pipe-expanding unit 70 comprises a plurality of pipe-expanding members 71 which are disposed at one side of the resin pipe 200 and expand the composition pipe and a pipe-expanding transfer member 76 which is connected to the pipe-expanding members 71 and transfers the pipe-expanding members 71. The pipe-expanding unit 70 expands both ends of the composition pipe to form the flange portion 210.

[126] In the above structure, the plurality of pipe-expanding members 71 may comprise a support 72 disposed at one side of the flange portion 210, a plurality of third movement means 73 which are fixed at the support 72 and can be moved in the lengthwise direction of the composition pipe, a pipe-expanding portion 74 comprising a bracket 74a which is hinge-connected to one end of the third movement means 73 and a pipe- expanding roller 74b which is rotatably connected to the bracket 74a, and a gap adjusting means 75 which is hinge-connected to the bracket 74a and the support 72 and adjusts a distance between the bracket 74a and the support 72.

[127] In addition, when the pipe-expanding roller 74b is configured to have a conical shape, as illustrated in FIG. 14, the quantity of deformation at a position where the pipe-expanding roller 74b is distant from the center of the pipe and at a position where the pipe-expanding roller 74b is close to the center of the pipe when the pipe- expanding roller 74b contacts the flange portion 210 and is expanded, is different so that the internal and external surfaces of the flange portion 210 are uniformly expanded and the number of sliding is reduced. Further, the surface of the pipe-expanding roller 74b is coated with Poly Tetra Fluoro Ethylene (PTFE) which is well known as a product name Teflon so that a softened resin may not stick fast to the pipe-expanding roller 74b.

[128] In the present embodiment, each of the third movement means 73 comprises a hydraulic and pneumatic cylinder and a piston. The adjusting means 75 comprises a gap adjusting nut 75a and a gap rod 75b which is divided into two portion around the gap adjusting nut 75a and is expanded or contracted by the gap adjusting nut 75a.

[129] On the other hand, except when the pipe-expanding unit 70 is used in the state where the composition pipe is disposed within the heating unit 30, as illustrated in FIG. 14, it is desirable to separately install the first heating means 90 which is disposed at the outside of the flange portion 210 to surround the flange portion 210 and heats the

flange portion 210. [130] In the above structure, as illustrated in FIG. 15, the pipe-expanding transfer member

76 may comprise a frame 77 in which the plurality of pipe-expanding members 71 are disposed in a radial shape, a fourth movement means 78 which is disposed at the frame

77 and moves the pipe-expanding members 71 so that a distance between the center of the pipe-expanding member 71 and the frame 77 can be adjusted, and a fifth movement means 79 which is connected to the frame 77 and moves the frame 77 in the lengthwise direction of the composition pipe.

[131] In the present embodiment, the frame 77 is configured to have a disk shape. The fourth movement means 78 comprises a motor 78a disposed at one side of the frame 77, a decelerator 78b installed at the motor 78a, a transfer screw 78c of which one end is connected to the motor 78a, which is connected to the support 72 and is disposed in the radius direction of the frame 77 and a guide rod 78d which is disposed to be parallel to the transfer screw 78c, is connected to the support 72 and guides the movement of the support 72. The transfer screw 78c is rotated by driving of the motor 78c, and the support 72 is moved in the radius direction of the frame 77 along the guide rod 78d by rotation of the transfer screw 78c.

[132] In addition, the fifth movement means 79 comprises a support bracket 79a which supports the lower portion of the frame 77, a wheel 79b which is disposed under the support bracket 79a, a motor which drives the wheel 79b and a decelerator 79c, and a rail 79d which contacts the wheel 79b and guides the movement of the wheel 79b. The wheel 79b is driven by the motor 79c and the wheel 79b makes a reciprocating motion on the rail 79d and so the frame 77 is move.

[133] In the above structure, as illustrated in FIG. 16, the pipe-expanding roller 74b pressurizes the end of the rotating composition pipe while sequentially changing the position and inclination angle using the third movement means 73, the fourth movement means 78 and the gap adjusting means 75 and as such the flange portion 210 is formed.

[134] The flange portion adhering unit 80 comprises a pressure plate 81 which is disposed at one side of the pipe-expanding unit 70 and contacts the flange portion 210 and a sixth movement means 85 which is connected to the pressure plate 81 and transfers the pressure plate 81 in the lengthwise direction of the composition pipe. The flange portion adhering unit 80 fuses the flange portion 210.

[135] In the present embodiment, the sixth movement means 85 comprises a cylinder 85a and a piston 85b and a connecting plate 85c, and the connecting plate 85c is connected to the pressure plate 81.

[136] Here, the sixth movement means 85 may comprise a second heating means 87 which is disposed at the outside of the flange portion 210 to surround the flange

portion 210 and heats the flange portion 210. The second heating means 87 may be the same as the first heating means 90 described above.

[137] In addition, with heating coils 82 positioned on a surface in which the pressure plate

81 contacts the flange portion 210, and with a radio frequency heating portion 83 provided on a surface opposite to the surface in which the pressure plate 81 contacts the flange portion 210, it enables heating speed to increase and heating time to be reduced.

[138] After that, the manufactured composition pipe is completed with the pipe cooling.

In this case, water cooling or air cooling by using a cooling device rather than natural air cooling is applicable to reduce the cooling time and to perform cooling operation sequentially from the metallic portion to the resin portion of the composition pipe.