KR20010047315A - Manufacturing method of composite pipe and device thereof - Google Patents

Abstract

PURPOSE: A method and an apparatus for manufacturing an improved composite pipe are provided which is improved so as to cover resins having various physical properties. CONSTITUTION: The method comprises an internal pipe forming process (11) in which an internal pipe of a resin material is formed; an adhesive coating process (12) in which the adhesive coated pipe is cooled after preheating the internal pipe and coating an adhesive on the preheated pipe; a metallic pipe forming process (14) forming and welding the internal pipe; a bonding process (15) bonding the internal pipe and the metallic pipe; and an external pipe covering process (16) covering the external pipe on the circumference of the metallic pipe, wherein the method further comprises a haul off process (13) consisting of a haul off unit after the adhesive coating process, metallic pipe forming process and external pipe covering process.

Description

Improved composite pipe manufacturing method and apparatus thereof

The present invention relates to a method for manufacturing a composite pipe coated with a resin on the inner and outer surfaces of a metal pipe, and to an improvement of a device for forming each part. An improved method for manufacturing a composite pipe and a device for coating the resin having various physical properties. The invention relates to.

Composite pipes in which a resin having predetermined physical properties are closely coated on the inner and outer surfaces of a metal are used as pipes for supplying hot and cold water, for example. It is produced in a pipe shape, and a metal pipe surrounding the outer circumference of the resin pipe is formed / manufactured, and then produced by coating the outer circumference.

An apparatus and a manufacturing method of the composite pipe of this type include Patent Publication No. 99-6415, which is presented as a process diagram in FIG. 11 and shown in one configuration state in FIG. 12 and another configuration state in FIG. Supply means 142 for supplying the inner plastic pipe 51 formed by an extruder and wound around the roll and the metal strip 531 wound around the roll to a metal pipe molding machine, and the metal supplied by the supply means 142. In the metal pipe forming means (143) in which the metal pipe (53) is molded while the strip (531) surrounds the inner plastic pipe (51) supplied by the die (34), the metal pipe forming means (143). Welding means 144 for welding both end surfaces of the metal strip 531 by a welding machine so that the metal pipe 53 is formed, and the metal pipe 53 formed by the welding means 144 is an internal plastic pipe Close contact with the main surface of 51 The metal pipe drawing means 15 'for drawing the metal pipe 53 to be drawn by the caterpillar so as to pass through the drawing member, and the metal pipe 53 formed by the metal pipe drawing means 15' are pulled. Composite pipe manufacturing apparatus, characterized in that the outer plastic pipe 54 is formed on the metal pipe 53 by the extruder in a state in which it is stretched while being in close contact with the inner plastic pipe 51 " A supply step 142 for supplying the inner plastic pipe 51 wound around the 55 and the metal band 531 wound on the roll to a metal pipe molding machine, and the metal band 531 supplied by the supply step 142. In the metal pipe forming step 143, the metal pipe 53 is molded while wrapping the inner plastic pipe 51 supplied by the die 34, the metal by the metal pipe forming step 143 A welding step 144 for welding both end surfaces of the metal strip 531 by a welding machine so that the tape 53 is formed, and the metal pipe 53 formed by the welding step 144 includes an internal plastic pipe 51. A metal pipe drawing step 15 'for drawing the metal pipe 53 to be drawn by a caterpillar so as to pass through the drawing member so as to be in close contact with the main surface of the metal sheet; and a metal pipe formed by the metal pipe drawing step 15'. (53) is stretched while being pulled, the composite pipe manufacturing method characterized in that the outer plastic pipe 54 is formed on the metal pipe 53 by the extruder in a state in close contact with the inner plastic pipe 51 " do.

Therefore, the inner pipe 51 made of resin by the inner pipe forming means 111 is molded as an extrusion, is shaped by the cooling means 112 and the drawing means 113, wound around the winding roll 55, and supplied to the next step. At the same time, a thin plate 531 (metal strip) wound on a roll is supplied 142 to form the pipe by embedding the inner pipe 51 by the die 34 which is a metal pipe forming means 143. , The welding means (144) is welded (Seam welding), but the material is a thin plate to be in contact with the end and welded (Butt welding), but in reality there is a difficulty, overlapping by a certain width of both ends (Wrap welding At this time, since the metal pipe 53 is located on the outer circumference of the inner pipe 51, but the metal pipe 53 is not bonded between them, the metal pipe 53 is drawn out by the metal pipe drawing means 15 'to the next step. Diameter of pipe 53 The outer surface of the inner pipe 51 and the inner surface of the metal pipe 53 are brought into close contact with each other by reducing the size of the inner pipe 51 so as to be bonded by the adhesive 52 applied to the outer circumference of the inner pipe 51. The outer pipe 54 is coated on the outer circumference of the metal pipe 53 by 161 to complete the composite pipe 5, and the composite pipe 5 is wound on the winding roll 55 by the composite pipe winding means 162. It was wound up and shipped.

Furthermore, as an apparatus for realizing this, the inner pipe 51 is extruded and molded by an extruder (not shown since it is a known device), and it is wound up on a roll and supplied to the next step, and the sheet material 531 is also wound up on a roll. The raw material is supplied while unwinding the two rolls, and the butt-seam welding method known as the metal pipe forming means 143 shown in FIG. 12 is issued on January 15, 82, p. 175. In forming the metal pipe 53 by welding, the molded metal pipe 53 is welded with a known welding machine (usually using a high frequency resistance welding method because the outer periphery of the thin plate material is welded), and the drawing means shown in FIG. The metal pipe 53 is drawn by 113 to bond the inner pipe 51 and the metal pipe 53 together, and the outer pipe 54 is extruded and coated on the outer circumference of the metal pipe 53.

By the way, the above-described method and apparatus have the following problems, outlined (the two inventions are described together because the category is not clear because there is no technical difference between the method invention and the device invention), the molding of the inner pipe 51 The inner pipe forming means 111 (extrusion by the extruder), the cooling means 112 and the drawing means 113 are known means, and after the inner pipe 51 is manufactured, the inner pipe 51 is formed by the winding means 114. Since the pipe 51 is wound on the roll, the inner pipe 51 has a limited length according to the roll size, so that the overall process is not online and the process efficiency is lowered. The butt seam welding method of FIG. 12 shown by (143) is a wrong pie if a slight error occurs between a plurality of rollers during continuous rolling of the known steelmaking method or the thin plate material 531. And the adjustment to modify this also depends on the skill of the skilled worker has a limitation in mass production, especially the supplied sheet material 531 is thin, narrow and long, it is easy to generate vibration when supplied, but this is fatal during It causes a problem, and also draws the metal pipe 53 to join the inner pipe 51 and the metal pipe 53. If the material forming the metal pipe 53 is uneven physical properties, the stretching is not made homogeneously. In particular, since the metal pipe 53 is sealed by welding, the weld part may have different elongation from other parts due to thermal deformation, so that bubbles are often formed between the inner pipe 51 and the metal pipe 53. In particular, the inner surface of the metal pipe 53 in a state where the seams of the thin plate 531 are not butt but overlapped. No choice but to have a level difference is also the occurrence of inevitable let no choice but elongation also vary. Other means and devices have been described so non-limitingly that the description thereof is omitted since it is doubtful that such composite pipes 5 can be produced.

The present invention has been researched and developed in order to completely solve the above problems, firstly to automate the entire process to minimize the manpower of the worker to materialize the change of the process line, and secondly to not affect the external working conditions Even if there is an action of the mass production of the regular product is possible, and the third is a invention completed to ensure that the devices making up each process is a simple yet solid structure, high durability, and also reduce the cost.

1 is a process diagram of the present invention,

2 is another process diagram of the present invention;

3 is a configuration diagram of one embodiment of the present invention;

Figure 4 is an enlarged excerpt of the cross-sectional view taken along the line A-A of FIG.

5 is another configuration of the present invention,

Figure 6 is an enlarged view of the excerpt B of Figure 5,

7 is another configuration of the present invention,

8 is another configuration of the present invention,

9 is a state diagram of the finished product of the present invention,

10 is an enlarged state of the excerpt C of Figure 9,

11 is a process chart of the conventional invention,

12 is a configuration diagram of a conventional invention;

13 is another configuration diagram of a conventional invention.

* Explanation of symbols for the main parts of the drawings

11: internal pipe forming process

111: internal pipe forming means 112: cooling means

113: drawing means 114: winding means

12: adhesive coating process 13: take-out process

14: metal pipe forming process

141: internal plastic pipe supply means

142: sheet material supply means 143: metal pipe forming means

144: welding means

15: joining process 15 ': metal tube drawing means

16: outer pipe coating process

161: outer pipe forming means 162: composite pipe blowing means

17: curve process

171: Fufu Unit

2: take out device

21: driving roll 22: manual roll 23: belt

231 hollow part

24: tension control means

241: manual roll shaft 242: handle

25: cylinder

3: Jig

31: jig frame 32: upper die die 33: support hole

34: die die 35: molding hole

4: Up and down roll bonding device 4 ': Left and right roll bonding device

41: forming frame 42: rotating roll 421: molding groove

43: up and down roll 431: molding groove 44: left and right roll

441: molding groove 45: handle 46: handle shaft

47: Boss

5: composite pipe

51 inner pipe 52 adhesive 53 metal pipe

531: thin plate 54: outer pipe 55: winding roll

The present invention to solve the above problems will be described in detail with reference to the drawings.

1 is an overall process diagram of the present invention.

According to the present invention, an inner pipe forming step (11) for forming an inner pipe (51) by cooling a melted resin through a die having a predetermined standard, and preheating the inner pipe (51) and applying an adhesive (52) to the outer circumference. After the coating, the adhesive coating step 12 for cooling and the inner pipe 51 are supplied together with the aluminum of the thin plate material 531 to form a pipe receiving the inner pipe 51 through the molding jig 3. The metal pipe forming step (14) to be welded, the joining step (15) for joining the inner pipe (51) and the metal pipe (53), and an adhesive (52) applied to the outer circumference of the metal pipe (53). In the method of manufacturing a composite pipe, which comprises an external pipe coating step 16 which extrudes, heats and cools the external pipe 54 to cover the external pipe 54, the adhesive coating step 12 and the metal pipe forming step (14) and outer pipe coating process (16) Added after the take-off process (13) comprising a take-off device (2) is a pair of belts 23 which is driven up and down at the same rate in each it will be characterized by comprising.

2 is another process diagram of the present invention.

In the above-described configuration, the curved process (17) consisting of a fupu unit (171) for guiding the pipe to be rounded by a predetermined angle on the process before disposing the welding apparatus used in the metal pipe forming step (14). It is preferable to characterize that it adds.

3 is a configuration diagram of the take-out device 2 forming the main part of the present invention, and FIG. 4A is an enlarged cross-sectional view taken along the line A-A of FIG.

The present invention is an internal pipe extrusion device for dissolving a resin to form an internal pipe 51 through a die of a predetermined standard, and size and cool the internal pipe 51 to a prescribed standard, and preheat the internal pipe 51 and the adhesive 52 on the outer periphery. ) And a material supply device for supplying the thin plate member 531 together with the inner pipe 51 with a predetermined tension by winding the thin plate member 531 and applying the thin plate member 531 to the inside. A molding apparatus for holding the pipe 51 and rolling it into the pipe-like metal pipe 53, a high frequency welder for welding the connection portion of the molded metal pipe 53, the welded metal pipe 53 and the inner pipe 51 Bonding apparatus for joining the adhesive, an adhesive applying apparatus for applying the adhesive 52 to the outer circumference of the metal pipe 53, and an outer pipe for covering and cooling the outer pipe 54 on the outer circumference of the metal pipe 53. Extruder In the apparatus for manufacturing a composite pipe made of the adhesive 52 and the forming jig (3) and the outer pipe 54 as a device to be arranged behind each of the additional extrusion device; The driving rolls 21 and 21 and the rotating manual rolls 22 and 22 which are rotated by a motor in pairs up and down are wound by belts 23 and 23, respectively, and the upper driving roll 21 and the manual roll ( 22) and the belt 23 is more preferably characterized in that it consists of a take-up device (2) which is adjusted up and down by a pair of cylinders (25, 25) mounted on the upper portion.

FIG. 4B is a cross-sectional view showing another configuration of the present invention in an enlarged view cut along the line A-A of FIG. 3 so as to be contrasted with FIG. 4A.

In the above configuration, it is preferable that the belts 23 and 23 of the take-out device 2 have a predetermined thickness, respectively, and are formed by forming the hollow portion 231 in the center thereof.

FIG. 5 is a configuration diagram showing the arrangement of the jig 3 which is another main part of the present invention, and FIG. 6 is an enlarged view of an excerpt B of FIG. 5 which is one jig 3.

The present invention is an internal pipe extrusion device for dissolving a resin to form an internal pipe 51 through a die of a predetermined standard, and size and cool the internal pipe 51 to a prescribed standard, and preheat the internal pipe 51 and the adhesive 52 on the outer periphery. ) And a material supply device for supplying the thin plate member 531 together with the inner pipe 51 with a predetermined tension by winding the thin plate member 531 and applying the thin plate member 531 to the inside. A molding apparatus for holding the pipe 51 and rolling it into the pipe-like metal pipe 53, a high frequency welder for welding the connection portion of the molded metal pipe 53, the welded metal pipe 53 and the inner pipe 51 Bonding apparatus for joining the adhesive, an adhesive applying apparatus for applying the adhesive 52 to the outer circumference of the metal pipe 53, and an outer pipe for covering and cooling the outer pipe 54 on the outer circumference of the metal pipe 53. Extruder In the apparatus for manufacturing a composite pipe made of the molding apparatus are upper and lower dies (32, 34) to be supported securely on the fixture frame 31; A support hole 33 through which the inner pipe 51 passes is drilled in the upper die 32, and a molding hole 35 is inserted into the lower die 34 so that the sheet material 531 is sequentially rolled into a pipe. It is more preferable that the jig 3 to be formed is formed by being spaced apart by a certain distance by a large number.

7 is a configuration diagram showing another configuration of the present invention.

The present invention is an internal pipe extrusion device for dissolving a resin to form an internal pipe 51 through a die of a predetermined standard, and size and cool the internal pipe 51 to a prescribed standard, and preheat the internal pipe 51 and the adhesive 52 on the outer periphery. ) And a material supply device for supplying the thin plate member 531 together with the inner pipe 51 with a predetermined tension by winding the thin plate member 531 and applying the thin plate member 531 to the inside. A molding apparatus for holding the pipe 51 and rolling it into the pipe-like metal pipe 53, a high frequency welder for welding the connection portion of the molded metal pipe 53, the welded metal pipe 53 and the inner pipe 51 Bonding apparatus for joining the adhesive, an adhesive applying apparatus for applying the adhesive 52 to the outer circumference of the metal pipe 53, and an outer pipe for covering and cooling the outer pipe 54 on the outer circumference of the metal pipe 53. Extruder In the composite pipe manufacturing apparatus consisting of, the joining device is a rotating roll 42 which is formed so that the semi-circular forming groove 421 is formed in the center and rotated in the forming frame 41, and the semi-circular forming groove ( 431 is formed and the upper surface of the rotating roll 42, the forming grooves (421, 431) to form a single hole to the upper and lower rolls 43 to be supported to move up and down in the forming frame (41) It is more preferable if it is characterized by the upper and lower roll joining apparatus 4 which consists of.

8 is a configuration diagram showing another configuration of the present invention.

The present invention is an internal pipe extrusion device for dissolving a resin to form an internal pipe 51 through a die of a predetermined standard, and size and cool the internal pipe 51 to a prescribed standard, and preheat the internal pipe 51 and the adhesive 52 on the outer periphery. ) And a material supply device for supplying the thin plate member 531 together with the inner pipe 51 with a predetermined tension by winding the thin plate member 531 and applying the thin plate member 531 to the inside. A molding apparatus for holding the pipe 51 and rolling it into the pipe-like metal pipe 53, a high frequency welder for welding the connection portion of the molded metal pipe 53, the welded metal pipe 53 and the inner pipe 51 Bonding apparatus for joining the adhesive, an adhesive applying apparatus for applying the adhesive 52 to the outer circumference of the metal pipe 53, and an outer pipe for covering and cooling the outer pipe 54 on the outer circumference of the metal pipe 53. Extruder In the composite pipe manufacturing apparatus consisting of a pair, the joining device, a pair of semi-circular forming grooves 441, 441 are formed to form a single hole when interviewed in the center is supported to rotate left and right while rotating in the forming frame (41) It is more preferable if it is characterized by the left and right roll bonding apparatus 4 which consists of right and left rolls 44 and 44.

The present invention is an internal pipe extrusion device for dissolving a resin to form an internal pipe 51 through a die of a predetermined standard, and size and cool the internal pipe 51 to a prescribed standard, and preheat the internal pipe 51 and the adhesive 52 on the outer periphery. ) And a material supply device for supplying the thin plate member 531 together with the inner pipe 51 with a predetermined tension by winding the thin plate member 531 and applying the thin plate member 531 to the inside. A molding apparatus for holding the pipe 51 and rolling it into the pipe-like metal pipe 53, a high frequency welder for welding the connection portion of the molded metal pipe 53, the welded metal pipe 53 and the inner pipe 51 Bonding apparatus for joining the adhesive, an adhesive applying apparatus for applying the adhesive 52 to the outer circumference of the metal pipe 53, and an outer pipe for covering and cooling the outer pipe 54 on the outer circumference of the metal pipe 53. Extruder In the composite pipe manufacturing apparatus consisting of, the joining device is a rotating roll 42 which is formed so that the semi-circular forming groove 421 is formed in the center and rotated in the forming frame 41, and the semi-circular forming groove ( 431 is formed and the upper surface of the rotating roll 42, the forming grooves (421, 431) to form a single hole to the upper and lower rolls 43 to be supported to move up and down in the forming frame (41) One or more sets of upper and lower roll bonding apparatuses 4; Semi-circular forming grooves (431, 431) in the center is formed to form a single hole when the interview is made of a left and right roll bonding device consisting of a pair of left and right rolls (44, 44) supported to rotate left and right while rotating in the forming frame (41) 4) at least one set; It is more preferable if it is characterized by being arranged alternately with each other.

The present invention configured as described above will be described with reference to FIG. 9, which is a state diagram of the finished product of the present invention, and FIG.

According to one configuration of the present invention, as a known composite pipe forming method, the inner pipe forming step (11) for forming the inner pipe (51) by cooling the dissolved resin through a die of a predetermined standard, and the inner pipe ( 51 is pre-heated and the adhesive coating step 12 for cooling after applying the adhesive 52 on the outer periphery, and the inner pipe 51 is supplied together with the aluminum of the thin plate material 531 to pass through the molding jig (3) A metal pipe forming step 14 which is molded and welded into a pipe housing the inner pipe 51; a joining step 15 for joining the inner pipe 51 and the metal pipe 53; and the metal pipe ( After the adhesive 52 is applied to the outer circumference of 53), the outer pipe 54 is extruded, heated and cooled to coat the outer pipe 54. In the adhesive coating process (12) After the metal pipe forming step 14 and the outer pipe coating step 16, a take-up step consisting of a take-off device 2 (haul-off M / C), which is a pair of belts 23 driven up and down at the same speed ( 13) is added to each of the above steps, the above-described process is disclosed in the above-described Patent Publication No. 99-6415 to manufacture only the inner pipe 51 separately wound on the take-up roll (55) to manually transport and supply to the next step On the contrary, since it is based on ON-line, these lines usually require a minimum length of 180m, so that the process flow can be improved while avoiding interference with other processes. It is essential that the take-out process 13 is added to the position, and the configuration for this is configured as described above, which forms the inner pipe 51 and the metal pipe 53 and the outer pipe 54 as described above. after To help pull each material was possible to encourage the proper molding. In addition, the take-out process 13 of the present invention uses a take-out device 2 consisting of a pair of upper and lower belts 23 so as to prevent external marks that may be generated during take-off by conventional roll driving. do.

According to another configuration of the present invention, a curve is formed of hoop units (171, Hoof Units) to guide the pipe rounded by a predetermined angle in the process prior to the excretion of the welding apparatus used in the metal pipe forming step (14) It is made by adding the step 17, and as described above, the minimum length of all the lines is 180 m. In the above-mentioned prior art, the process is divided by making the inner pipe 51 separately. In order to optimize the layout of the plant while increasing the process efficiency by adding the line online, the curved process (17) was added in the middle so that the process can be arranged in a folded form in a straight line. The oxidization process 17 should be placed before the welding apparatus, since there may be thermal deformation in the metal pipe 53 after the metal pipe 53 is welded. In order to prevent as much deformation as possible, the hoop unit 171 is a device that changes the pipes 51 and 53 fed in a straight line to a predetermined diameter by 180 °. For example, a wheel having a large diameter Pipe 53 is guided by the pipe 53 on the outer periphery thereof to guide and rotate smoothly, or by arranging a plurality of rolls of small diameter in a circumferential direction to achieve a large diameter. To rotate sequentially.

According to another configuration of the present invention, a known composite pipe manufacturing apparatus, the internal pipe extrusion device for dissolving the resin to form the inner pipe 51 through a die of a predetermined standard, sized to a specified standard and then cooled And an adhesive coating device for preheating the inner pipe 51 and applying and cooling the adhesive 52 to the outer circumference, and the thin plate 531 is wound, and the thin plate 531 together with the inner pipe 51 at a predetermined tension. High-frequency welding device for supplying a material supplying device, a molding device for rolling the supplied thin plate material 531 into a pipe-shaped metal pipe 53 while accommodating the inner pipe 51, and a connecting portion of the formed metal pipe 53. A welding apparatus, a joining apparatus for joining the welded metal pipe 53 and the inner pipe 51, an adhesive applying device for applying and cooling the adhesive 52 on the outer circumference of the metal pipe 53, and the metal pipe 53 Other than It is based on the outer pipe extrusion apparatus which coats and cools the outer pipe 54 mainly, and the said adhesive 52, the said molding jig 3, and the said outer pipe (In the line which consists of these apparatuses), 54) as take-off device 2 which is further excreted after the extrusion device, respectively; The driving rolls 21 and 21 and the rotating manual rolls 22 and 22 which are rotated by a motor in pairs up and down are wound by belts 23 and 23, respectively, and the upper driving roll 21 and the manual roll ( 22) and the belt 23 is configured to be adjusted up and down by a pair of cylinders (25, 25) mounted on the upper portion, the take-up device (2) appropriately supply the material flowing continuously between each device of the line At this time, the take-out device 2 is a driving roll 21 and the manual roll 22 to be freely rotated by a belt (23, 23) of a pair of upper and lower rubber material driven by the power of a motor (not shown), respectively. It is wound at the same speed in the same direction and conveyed to the pipe 51, 53, 54 smoothly conveyed without marks as shown in the cross-sectional view shown in Figure 4a, the upper rolls (21, 22) and the belt 23 Is equipped with a pair of cylinders (25, 25) to raise and lower them simultaneously, To maintain proper separation distance. At this time, when the tension adjusting means 24, 24 of the manual rolls 22, 22 are mounted, that is, the manual roll shaft 241 is moved forward and backward by the rotation of the handle 242. By allowing it to move far and close to the feed rolls 21 and 21, the tension applied to the belts 23 and 23 is adjusted so that an appropriate tension is provided so that a slip does not remain on the outer circumference of the material. In addition, since the upper and lower belts 23 and 23 are in surface contact with the outer circumference of the material (pipe) to push the material, as shown in FIG. 4A, the outer circumference of the material is somewhat wrapped. To this end, the belts 23 and 23 should be able to retract to some extent, and even if the belts 23 and 23 are retracted, the rolls 21, 21, 22 and 22 that support the belts 23 and 23 are also centered. Not to support the elasticity of the material can be supported, which is shown in Figure 4a As shown, this can be solved by cutting off the center of the rolls 21, 21, 22, 22 and connecting them to the shaft. A more preferable solution is to use the belts 23, 23 described below, Even if it is to use the technical spirit of the present invention as it is obvious within the scope of the right.

In addition to the above-described configuration of the present invention, the belts 23 and 23 of the take-out device 2 each have a predetermined thickness, and the hollow portion 231 is formed at the center thereof, so that the pipe-like material Even if the 51, 53, and 54 are pressed, the marks 51, 53, and 54 are not left by the cushion of the hollow part 231.

According to still another configuration of the present invention, in the known composite pipe manufacturing apparatus, a plurality of jigs 3 are disposed to be spaced apart by a predetermined distance as the forming apparatus, and each of these jigs 3 has two dies (up and down) 32, 34 is firmly supported by the jig frame 31, it is easy to adjust by moving up and down within the jig frame 31, the upper die (32) support holes through which the inner pipe 51 passes (33) is perforated, the lower die (34) is inserted into the thin plate member 531 is formed in the through hole 35 to be sequentially rolled into a pipe, so the lower die (34) of the plurality of jig (3) 34,... Are formed through holes 35 so as to form a circle sequentially from a straight line. Therefore, the thin sheet material 531 supplied to the molded holes 35 of the first jig 3 is a straight strip. When passing through the forming hole 35 of the last jig 3, the strip has a circular shape. It said, where the inner pipe (51) passing through the mold die 32 is to be embedded in a metal pipe 53 formed into a pipe. In addition, since the conventional invention described above uses a butt seam welding method different from that of the jig 3 of the present invention, a plurality of rolls form the thin plate material 531 into a pipe, which is difficult to adjust between the rolls as described above. Since the thin plate 531 is thin and narrow, it is swayed by its own weight at the time of supply, and the inner pipe 51, which is a resin material supplied with it, is also susceptible to vibration, and this vibration acts as a fatal defect in pipe manufacturing. In the present invention, since the jig 3 is configured such that the inner pipe 51 and the thin plate member 531 are supplied and supported separately, the above-described problem does not occur, and in particular, both ends of the thin plate member 531 do not overlap. In the butt state, the pipes are formed so that the composite pipe 5 to be formed later is an accurate and complete coating.

According to another configuration of the present invention, the joining device of the above configuration is the up and down roll joining device 4, which is a semicircular forming groove 421 is formed in the center is rotated to be supported to rotate in the forming frame 41 When the roll 42 and the semi-circular forming groove 431 is formed at the center to be interviewed on the top of the rotating roll 42, the forming grooves 421 and 431 form a single hole in the forming frame 41. It consists of an up-and-down roll 43 which is supported to be moved up and down, Therefore, the metal pipe 53 passes between the forming grooves 421 and 431 formed by the rotating roll 42 and the up and down roll 43 While the diameter is reduced, the inner circumferential surface of the metal pipe 53 is in close contact with the outer circumference of the inner pipe 51, but the adhesive 52 is applied to the outer circumference of the inner pipe 51, so that the inner pipe 51 The metal pipe 53 is firmly bonded. In particular, the conventional invention allows the inner pipe 51 to adhere while reducing the diameter of the metal pipe 53 by extrusion so that the material is not uniformly drawn by the heat of welding, resulting in defects in the joining. The pair of rolls 42 and 43 perform local diameter reduction operations so that the above-described defects do not occur. In addition, the upper and lower rolls 43, because the boss boss 47 for supporting the shaft rotationally freely is guided to the frame 41, when turning the handle 45 installed on the upper portion of the frame 41 through the handle shaft 46 Rotation force advances up and down the shaft boss 47, the principle of the rack and pinion (Rack & Pinion) can be applied as it is.

According to another configuration of the present invention, in the known composite pipe manufacturing apparatus, the joining device is a left and right roll joining device 4, so that the semicircular shaped grooves 431 and 431 are interviewed in the center to form a single hole. It is formed of a pair of left and right rolls (44, 44) are formed and supported to rotate left and right while rotating in the forming frame 41, which is the same as the above-described configuration because the upper and lower roll bonding device (4) lying sideways Done.

According to still another aspect of the present invention, in the known composite pipe manufacturing apparatus, the bonding apparatus includes one or more sets of the upper and lower roll bonding apparatuses 4 and one or more sets of the left and right roll bonding apparatuses 4 described above. And, since they are arranged alternately with each other, the metal pipe 53 is made of pipes passing through the forming grooves (421, 431, 441) of each of the rolls 42, 43, 44 are continuously reduced in diameter, wherein the top and bottom rolls Since the joining device 4 and the left and right roll joining devices 4 'are alternately arranged, the metal pipes 53 are gradually reduced by being interlocked to achieve perfect joining with the inner pipe 51, and the joining device used is As the number of (4, 4 ') is increased, it is preferable to gradually reduce the diameter, but three sets of installations can achieve efficiency and economy together in terms of device economy.

Hereinafter, a process of manufacturing the composite pipe of the present invention will be described with reference to preferred embodiments.

Example

The resin was placed in the container of the extruder, and the inner pipe 51 having an inner diameter of Φ 15 mm was extruded while being maintained at 180 to 200 ° C., sized at a vacuum degree of 40 to 50 mm Hg, and passed through a 20 L cooling water tank to pass the inner pipe ( 51). At this time, the resin used was high density polyethylene (HDPE; LG Chemical's LUTMER AP150) for cold water pipe, and crosslinkable HDPE (SK POLYLINK XL380 of SK) for hot water pipe. 1 and Table 2, respectively.

TABLE 1

characteristic Test Method (ASTM) unit value Melt Index (190 ℃ / 2.16㎏) D1238 g / 10min 3.6 density D1505 g / cm 3 0.926 Crystal melting point DSC ℃ 125

TABLE 2

Properties Unit Test Method Specification Value Melt Flow Rate (190 ℃, 5㎏) Density Fracture Tensile Strength Fracture Elongation Izod Impact Strength Beet Cut Duct g / 10min ASTM D1238 0.2-0.4 0.3g / cm3 ASTM D1505 0.948-0.952 0.950kg / cm3 ASTM D638> 200 250ASTM D638> 300 400kg.cm/cm ASTM D256 No break No break ℃ ASTM D1525> 122 125SK METHOD> 65 66-68

⊙ Master Vessel Mix Ratio: 5

⊙ Specific temperature of extruder (℃)

DIE: 200 to 230, Head: 200 to 210, Heating zone: 140 to 210

⊙ bridge

* Deposition by hot water at 90 ° C for 4 hours.

* Low pressure steam (0.15 bar) for 5-6 hours (sauna)

⊙ Package: 25㎏ Aluminum Bag W / Aromachi

The produced inner pipe 51 was continuously preheated, and a thin film adhesive 52 (SK POLYGLUE HE910G of SK) was applied to the outer circumference of the inner pipe 51 by passing through the adhesive 52 blowing die. Physical properties of the adhesive 52 are shown in Table 3.

TABLE 3

Properties Unit Test Method Specification Value Melt Flow Density Fracture Tensile Strength Crushing Elongation Hardness Beet Duct Absorption Rate Breaking Temperature Oxygen Sensing Time Melting Point g / 10min ASTM D1238 3.8-4.5 4.11 g / cm 3 ASTM D792 0.942-0.946 0.945 kg / cm 3 ASTM D638> 150 200ASTM D638> 550 750 Shore D ASTM D2240> 505 55 ° C ASTM D1525> 110 110.6wt ASTM D570 <0.01 <0.01 ° C ASTM D746 <-70 <-70mim DSC> 5 13 ℃ DSC 126-128 128

⊙ Package: 25㎏, 500㎏

The inner pipe 51 to which the adhesive 52 is applied is drawn at 1 to 20 m / min by the take-out device 2, and the traveling direction is changed by 180 ° using the fupu unit 171, and the thin plate material which is the thin plate supply means 142. (531) Each die (32, 34) of the jig (3) while unwinding a thin plate (531; physical properties see Table 4) having a thickness of 0.25 to 0.5 mm and a width of 58 to 61 mm from the take-up roll and feeding at the same speed as the inner pipe (51). Pass through the last jig (3), and pipe the metal pipe (52) having a diameter of 18.4 to 19.2mm to embed the inner pipe (51), and then butt-sea welding in the welder Do it. The welding machine is a well-known high frequency welding machine, and welds at a speed of 6 to 20 m / min with a current of 50 to 70 A.

Subsequently, the molded metal pipe 53 is continuously passed through two sets of top and bottom roll joining apparatuses 4 and joining apparatuses 4, 4 'and 4 having left and right roll joining apparatuses 4' disposed therebetween. The inner pipe 51 and the metal pipe 53 are joined. The diameter of the roll pair of the bonding apparatuses 4, 4 ', 4 was made into (phi) 19.6, (phi) 19.4, and (phi) 19.2.

The outer pipe 54 is covered by passing a known resin extruder that extrudes HDPE through the outer circumference of the completed metal pipe 53, and the resin pipes inside and outside the metal pipe 53 are passed through a heating unit at 300 to 400 ° C. (51, 54) are brought into close contact. At this time, by applying the adhesive 52 before the coating of the outer pipe 54, it is possible to complete the adhesion of the outer pipe 54, the composite pipe 5 produced is as shown in FIG. Since it is wound around the winding roll 55 shown in Fig. 9 by a predetermined length and shipped as a product, a trademark or the like may be printed by a printing machine on which an encoder is mounted before winding.

According to the above embodiment, one roll of the composite pipe (5) was manufactured, and visual inspection of the whole was carried out. Three pieces were randomly cut and commissioned by the Korea Institute of Chemical Testing, and tested for breakdown water pressure, and the results are shown in Table 4. It was.

TABLE 4

The present invention, as described above, to automatically change the process line while minimizing the manpower of the operator by automating the entire process, so as not to affect the external working conditions mass production of normal products regardless of the external action It is a useful and effective invention that was developed to enable this, and the devices making up each process are made of simple yet solid structure, high durability and cost reduction.

Claims (8)

The inner pipe forming step 11 of forming the inner pipe 51 by cooling the melted resin through a die having a predetermined standard, and preheating the inner pipe 51 and applying an adhesive 52 to the outer circumference, and then cooling it. The adhesive coating step 12 and the inner pipe 51 is supplied together with the aluminum of the thin plate material 531, the metal is molded and welded into a pipe receiving the inner pipe 51 through the molding jig (3). The pipe forming step 14, the joining step 15 for joining the inner pipe 51 and the metal pipe 53, and the outer pipe (after applying the adhesive 52 to the outer circumference of the metal pipe 53) In the manufacturing method of the composite pipe which consists of the outer pipe coating process 16 which extrudes 54, heats, cools, and coats the outer pipe 54, After the adhesive coating step 12, the metal pipe forming step 14, and the outer pipe coating step 16, a take-up step consisting of a take-out device 2 consisting of a pair of belts 23 driven up and down at the same speed. Improved composite pipe production method characterized in that the addition of each of (13). The process according to claim 1, further comprising a curved process (17) consisting of a fu unit (1531) for guiding the pipe at a predetermined angle round the process before disposing the welding apparatus used in the metal pipe forming process (14). Improved composite pipe manufacturing method, characterized in that made. By dissolving the resin to mold the inner pipe 51 through a die of a predetermined standard, and to size and cool the inner pipe 51, and to preheat the inner pipe 51, and to apply an adhesive 52 to the outer periphery An adhesive coating device for cooling, a material supply device for supplying the thin plate material 531 together with the inner pipe 51 at a predetermined tension by winding the thin plate material 531, and the supplied thin plate material 531 to the inner pipe 51. A molding apparatus for rolling the pipe-shaped metal pipe 53 while receiving the water, a high frequency welder for welding the connection part of the molded metal pipe 53, and a joint for joining the welded metal pipe 53 and the inner pipe 51 together. Apparatus, adhesive applying device for applying and cooling the adhesive 52 on the outer circumference of the metal pipe 53, and outer pipe extrusion device for coating and cooling the outer pipe 54 on the outer circumference of the metal pipe 53 Is the composite pipe making machine, A device which is further disposed behind the adhesive 52, the molding jig 3 and the outer pipe 54 extrusion apparatus, respectively; The driving rolls 21 and 21 and the rotating manual rolls 22 and 22 which are rotated by a motor in pairs up and down are wound by belts 23 and 23, respectively, and the upper driving roll 21 and the manual roll ( 22) and an improved composite pipe manufacturing apparatus, characterized in that the belt (23) consists of a take-up device (2) which is adjusted up and down by a pair of cylinders (25, 25) mounted on the top thereof. 4. The improved composite pipe manufacturing apparatus according to claim 3, wherein the belts (23, 23) of the take-out device (2) each have a predetermined thickness and a hollow portion (231) is formed in the center thereof. By dissolving the resin to mold the inner pipe 51 through a die of a predetermined standard, and to size and cool the inner pipe 51, and to preheat the inner pipe 51, and to apply an adhesive 52 to the outer periphery An adhesive coating device for cooling, a material supply device for supplying the thin plate material 531 together with the inner pipe 51 at a predetermined tension by winding the thin plate material 531, and the supplied thin plate material 531 to the inner pipe 51. A molding apparatus for winding the pipe-shaped metal pipe 53 into a housing, a high frequency welder for welding the connection portion of the molded metal pipe 53, and a welded metal pipe 53 and the inner pipe 51 to be joined together. A bonding apparatus, an adhesive applying device for applying and cooling the adhesive 52 on the outer circumference of the metal pipe 53, and an outer pipe extrusion device for covering and cooling the outer pipe 54 on the outer circumference of the metal pipe 53. Iru In the apparatus for manufacturing a composite pipe which, The molding apparatus is firmly supported on the jig frame 31 by two dies 32 and 34; A support hole 33 through which the inner pipe 51 passes is drilled in the upper die 32, and a molding hole 35 is inserted into the lower die 34 so that the sheet material 531 is sequentially rolled into a pipe. Improved composite pipe manufacturing apparatus, characterized in that the jig (3) formed is formed by a plurality of predetermined distances apart. By dissolving the resin to mold the inner pipe 51 through a die of a predetermined standard, and to size and cool the inner pipe 51, and to preheat the inner pipe 51, and to apply an adhesive 52 to the outer periphery An adhesive coating device for cooling, a material supply device for supplying the thin plate material 531 together with the inner pipe 51 at a predetermined tension by winding the thin plate material 531, and the supplied thin plate material 531 to the inner pipe 51. A molding apparatus for rolling the pipe-shaped metal pipe 53 while receiving the water, a high frequency welder for welding the connection part of the molded metal pipe 53, and a joint for joining the welded metal pipe 53 and the inner pipe 51 together. Apparatus, adhesive applying device for applying and cooling the adhesive 52 on the outer circumference of the metal pipe 53, and outer pipe extrusion device for coating and cooling the outer pipe 54 on the outer circumference of the metal pipe 53 Is the composite pipe making machine, The joining device, a semi-circular forming groove 421 is formed in the center of the rotating roll 42 is supported so as to rotate in the forming frame 41, and a semi-circular forming groove 431 is formed in the center of the rotating roll ( 42 is the upper and lower roll bonding apparatus (4) consisting of the upper and lower rolls 43 are supported to be moved up and down in the forming frame 41 when the forming grooves (421, 431) to form a single hole when interviewed on the upper portion Improved composite pipe manufacturing apparatus, characterized in that. By dissolving the resin to mold the inner pipe 51 through a die of a predetermined standard, and to size and cool the inner pipe 51, and to preheat the inner pipe 51, and to apply an adhesive 52 to the outer periphery An adhesive coating device for cooling, a material supply device for supplying the thin plate material 531 together with the inner pipe 51 at a predetermined tension by winding the thin plate material 531, and the supplied thin plate material 531 to the inner pipe 51. A molding apparatus for rolling the pipe-shaped metal pipe 53 while receiving the water, a high frequency welder for welding the connection part of the molded metal pipe 53, and a joint for joining the welded metal pipe 53 and the inner pipe 51 together. Apparatus, adhesive applying device for applying and cooling the adhesive 52 on the outer circumference of the metal pipe 53, and outer pipe extrusion device for coating and cooling the outer pipe 54 on the outer circumference of the metal pipe 53 Is the composite pipe making machine, The joining device includes a pair of left and right rolls 44 and 44 which are formed to form a single hole when the semi-circular shaped grooves 441 and 441 are interviewed in the center and are supported to rotate left and right while rotating in the forming frame 41. Improved composite pipe manufacturing apparatus, characterized in that the left and right roll bonding device (4). By dissolving the resin to mold the inner pipe 51 through a die of a predetermined standard, and to size and cool the inner pipe 51, and to preheat the inner pipe 51, and to apply an adhesive 52 to the outer periphery An adhesive coating device for cooling, a material supply device for supplying the thin plate material 531 together with the inner pipe 51 at a predetermined tension by winding the thin plate material 531, and the supplied thin plate material 531 to the inner pipe 51. A molding apparatus for rolling the pipe-shaped metal pipe 53 while receiving the water, a high frequency welder for welding the connection part of the molded metal pipe 53, and a joint for joining the welded metal pipe 53 and the inner pipe 51 together. Apparatus, adhesive applying device for applying and cooling the adhesive 52 on the outer circumference of the metal pipe 53, and outer pipe extrusion device for coating and cooling the outer pipe 54 on the outer circumference of the metal pipe 53 Is the composite pipe making machine, The joining device, a semi-circular forming groove 421 is formed in the center of the rotating roll 42 is supported so as to rotate in the forming frame 41, and a semi-circular forming groove 431 is formed in the center of the rotating roll ( 42 and the upper and lower roll bonding apparatus (4) consisting of the upper and lower rolls 43 are supported to be moved up and down in the forming frame 41 when the grooves (421, 431) to form a single hole when interviewed on the top More than a set; Semi-circular forming grooves (431, 431) in the center is formed to form a single hole when the interview is made of a left and right roll bonding device consisting of a pair of left and right rolls (44, 44) supported to rotate left and right while rotating in the forming frame (41) 4) at least one set; Improved composite pipe manufacturing apparatus, characterized in that consisting of alternately arranged.