JP2995626B2 - Apparatus and method for manufacturing composite pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a composite pipe (Com).
The present invention relates to a manufacturing apparatus and a manufacturing method for a positive pipe, and particularly, a plastic pipe and a metal pipe are hermetically bonded.

[0002]

2. Description of the Related Art The above-mentioned composite pipe means a pipe having a two-layer or three-layer structure when a plastic pipe and a metal pipe are viewed in cross section.

A conventional composite pipe manufacturing system will be described in detail with reference to a manufacturing system block diagram of FIG. First, looking at a molding apparatus for molding an internal plastic pipe, a plastic pipe molding means (1) for extruding plastic by an extruder to form an internal plastic pipe (Ip), and an internal part obtained by the plastic pipe molding means described above. Cooling means (2) for cooling the plastic pipe (Ip) with a cooler, and drawing means (3) for drawing the internal plastic pipe (Ip) cooled by the cooling means (2) with a drawing machine;
Winding means (4) for winding the internal plastic pipe (Ip) drawn by the drawing means (3) on a winding roll by a winder.

Further, the internal plastic pipe (Ip) wound around the winding roll by the winding means (4) as described above.
And an internal plastic pipe supply means (5) for supplying the internal plastic pipe (Ip) to the pipe molding machine. ,
Metal strip supply means for unwinding a metal strip (Ms) wound on a take-up roll and supplying it to a pipe forming machine so that a metal pipe (Mp) is formed so as to cover the outside of the internal plastic pipe (Ip). (6) and metal strip supply means (6)
Metal band bending means (7) for gradually bending a metal band (Ms) supplied by a roll (R), and an internal plastic while being gradually bent into a pipe form by the metal band bending means (7). Metal pipe forming means (8) for forming a metal pipe (Mp) around the periphery of the pipe (Ip) is provided.

[0005] As described above, after the metal pipe (Mp) is formed around the inner plastic pipe (Ip) by the metal pipe forming means (8), conventionally, the metal pipe (Mp) is formed on the inner plastic pipe (Ip). Metal pipe (M
Cutting means (9) for cutting both end faces of the metal strip (Ms) with a slitter to facilitate welding in which both end faces of the metal strip (Mp) are brought into close contact with each other, and cutting means (9). Butt welding means (10) for welding the butted portions after butting both side end faces of the metal strip (Ms) cut by the method, and an extruder on the metal pipe (Mp) formed by the welding means (10). Plastic pipe forming means (11) for forming an external plastic pipe (Op) by means of a composite pipe winding means for winding a composite pipe (Cp) obtained by the external plastic pipe forming means (11) on a winding roll (12).

As shown in FIG. 2, the composite pipe (Cp) has a three-layer structure including an internal plastic pipe (Ip), a metal pipe, and an external plastic pipe (Op).

[0007]

As described above, in the conventional composite pipe (Cp) manufacturing system, as shown in FIGS. 3 and 4, the metal strip (Ms) is gradually bent by the roll (R). While the metal pipe (Mp) is formed.
At this time, the formed metal pipe (Mp) was brought into close contact with the outer surface of the inner plastic pipe (Ip) by the roll (R). Since the molding of the outer plastic pipe (Op) on the outer surface of (i) is not perfect, there is a problem that the commercial value of the composite pipe (Cp) is reduced.

When forming a metal pipe (Mp),
Butt welding is performed by butt welding both side end surfaces of the metal band (Ms). At this time, cutting means for cutting both ends of the metal band (Ms) using a slitter is required in order to improve the butt. In addition, due to the chip generated by cutting, the external plastic pipe (Op) is not completely adhered when forming the external plastic pipe (Op) on the metal pipe (Mp). There was a problem that occurred. The purpose of the present invention is
It is to solve the above-mentioned problem.

[0009]

In order to achieve the above object, an apparatus for manufacturing a composite pipe according to the present invention is characterized in that the metal pipe is formed by the metal pipe forming means. Welding means for welding both end faces of the metal strip by a welding machine, and a metal pipe pulled by a catapillar so as to pass through a drawing member in order to bring the metal pipe welded by the welding means into close contact with the peripheral surface of the internal plastic pipe. And an external plastic pipe is extruded on the metal pipe in a state where the metal pipe is stretched while being drawn by the metal pipe extracting means and is in close contact with the internal plastic pipe. To be molded.

[0010] According to the above construction, the metal band supplied for forming the metal pipe around the periphery of the inner plastic pipe formed by the extruder is gradually bent by the guide groove formed in the die, and the cross section is formed. Is provided with a metal pipe forming means for forming a metal pipe around the periphery of the internal plastic pipe by turning into a circular shape. Further, both end faces of the metal band are butt-welded by butt welding means so that the metal pipe is maintained at the periphery of the inner plastic pipe by the metal pipe forming means. By pulling out the metal pipe in order to bring the metal pipe formed in a state in which the both end faces of the metal strip are butt-welded by this welding means into close contact with the peripheral surface of the internal plastic pipe, as the inner diameter of the metal pipe becomes smaller, Metal pipe pulling means for bringing the metal pipe into close contact with the inner plastic pipe, and, in a state where the metal pipe is in close contact with the inner plastic pipe by the pulling means, extruding the outer plastic pipe on the outer peripheral surface of the metal pipe by an extruder. An external plastic pipe molding means for molding is provided. With this configuration, it is possible to prevent the occurrence of defective products in the production of the composite pipe in which the plastic pipe and the metal pipe are brought into close contact with each other, and to simplify the structure to improve the productivity.

In addition to the structure of the first aspect, when the metal pipe is formed by the metal pipe forming means as described in the second aspect, the both ends of the metal strip are brought into good contact with each other. Providing a pressure roll for holding the abutting portion is advantageous in the following respects. Generally, when cutting a welded portion, chips are generated. However, in the present invention, generation of chips is prevented by performing a pressing operation with a pressure roll.

The metal pipe pulling means may include a first pulling member, a second pulling member, and a third pulling member, which are sequentially installed in a guide die. The diameter of the extraction groove formed in the second extraction member is smaller than the diameter of the extraction groove formed in the first extraction member, and the third extraction member is smaller than the diameter of the extraction groove formed in the second extraction member. It is possible to configure so that the diameter of the drawing groove formed in the groove becomes small.

In order to achieve the above object, a method of manufacturing a composite pipe according to the present invention is characterized in that the metal pipe is maintained in a formed state in the metal pipe forming step. A welding step of welding both end faces of the metal band to the metal pipe by a welding machine, and pulling the metal pipe welded by this welding step with a catapillar so as to pass through a drawing member so that the metal pipe is in close contact with the peripheral surface of the internal plastic pipe. A metal pipe drawing step for allowing the pipe to be drawn, and in a state where the metal pipe formed in the metal pipe drawing step is drawn while being drawn and adhered to the internal plastic pipe, an external plastic pipe is placed on the metal pipe. Forming an external plastic pipe so that the pipe is formed by an extruder. According to the above configuration, while the metal band supplied for forming the metal pipe on the periphery of the internal plastic formed by the extruder is gradually bent by the guide groove formed in the die, the cross section becomes circular. Forming a metal pipe around the periphery of the inner plastic pipe; and forming the metal pipe around the periphery of the inner plastic pipe in the above-described step of forming the metal pipe. A welding step in which the end faces are butt-welded, and in a state in which both end faces of the metal strip are butt-welded by this welding step, the metal pipe is pulled out to make the formed metal pipe adhere to the peripheral surface of the inner plastic pipe. So that the inner diameter of the metal pipe becomes smaller, And a metal pipe pull-out stage,
An external plastic pipe forming step of forming an external plastic pipe by an extruder on the outer peripheral surface of the metal pipe from a state in which the metal pipe is in close contact with the internal plastic pipe by the drawing step. In this way, the close contact of the metal pipe with the internal plastic pipe was improved.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 5 is a block diagram showing an embodiment of the present invention. Internal plastic pipe (Ip)
Is molded by an internal plastic pipe forming means (101) for extruding plastic by an extruder to form an internal plastic pipe (Ip). The internal plastic pipe (Ip) is formed of a metal pipe (Mp) described later.
It is molded from one of cross-linked polyethylene and high-density polyethylene with a material that blocks air to prevent oxidation and damage of the polyethylene.

The apparatus further comprises a cooling means (102) for applying an adhesive (A) to the internal plastic pipe (Ip) obtained by the internal plastic pipe molding means (101) and cooling the adhesive (A) with a cooler. A drawing means (103) for pulling the internal plastic pipe (Ip) cooled by the cooling means (102) by a drawing machine, and a winding machine for winding the internal plastic pipe (Ip) drawn by the drawing means. Winding means (1
04).

Further, the inner plastic pipe (I) wound on a winding roll by the winding means (104) as described above.
an internal plastic pipe supply means (105) for supplying p) to a pipe molding machine; and when supplying the internal plastic pipe (Ip) by the internal plastic pipe supply means, an adhesive is applied to the outside and supplied. In order to form a metal pipe (Mp) that covers the outside of the internal plastic pipe (Ip), the metal band (Ms) wound on the winding roll is unwound, and the metal band (Ms) is unwound.
And a metal band supply means (106) for supplying the pressure.
The above-mentioned metal band (Ms) is aluminum.

The apparatus further comprises a metal strip supply means (10).
6) While gradually bending the metal strip (Ms) supplied by the guide groove (201) formed in the die (D) as shown in FIG. 6 and FIG. ) Is formed by a metal pipe forming means (107) for forming a metal pipe (Mp) around the periphery.

The apparatus is further provided with an internal plastic pipe (I) by means of the metal pipe forming means (107).
A butt welding means (108) for abutting both side end faces of the metal strip (Ms) so as to maintain a state in which the metal pipe (Mp) is formed around the periphery of p), and then welding the butt portion with a welding machine. For this match,
In the apparatus of the present invention, as shown in FIG. 8, the metal pipe (Mp) formed by the metal pipe forming means is formed by abutting portions of the metal strip (Ms) in order to improve the abutment of both end faces. And a pressure roll (PR) for holding the pressure. In general, chips are generated due to a cutting operation of a welded portion before welding. However, in the present invention, generation of chips is prevented by performing abutting by pressing operation with a pressure roll (PR). .

In a state where the both end surfaces of the metal strip (Ms) are butt-welded by the above-mentioned welding means (108), the formed metal pipe (Mp) is in a state of being in close contact with the peripheral surface of the internal plastic pipe (Ip). Is not done. Therefore, the metal pipe (Mp) becomes the inner plastic pipe (I
Metal pipe (Mp) so that it can adhere to p)
Thus, the metal pipe (Mp) is stretched by drawing, so that the metal pipe (Mp) comes into close contact with the internal plastic pipe (Ip) as the inside diameter becomes smaller, thereby forming a metal pipe drawing means (109). .

Further, after the metal pipe (Mp) is in close contact with the internal plastic pipe (Ip) by the drawing means, the external plastic pipe (Op) is attached to the outer peripheral surface of the metal pipe (Mp) by an extruder. An external plastic pipe forming means (110) for molding and a composite pipe winding means (111) for winding a composite pipe (Cp) formed by the above-mentioned external plastic pipe forming means (110) on a winding roll are constituted. Was. As the outer plastic pipe (Op), one of cross-linked polyethylene and high-density polyethylene is selectively used.

In order to form the metal pipe (Mp) in close contact with the inner plastic pipe (Ip), the drawing means (109) for pulling the metal pipe (Mp) so that it passes through the guide die (202) is as follows. It is like. That is, as shown in FIG. 9, the drawing means (109) converts the metal pipe (Mp) formed by passing through the die (D) and welded by the welding means (108) into the guide die (202) as shown in FIG. ). The metal pipe (Mp)
When passing through the above-mentioned guide die (202), it is stretched by being pulled by a caterpillar and passing through a drawing member mounted in the above-mentioned guide die (202).

The above-mentioned drawing member comprises a first drawing member (203) and a second drawing member (204) in a guide die (202).
And a third withdrawal member (205) are sequentially installed, and the metal pipe is stretched while passing through the guide groove by the above-mentioned withdrawal member and is brought into close contact with the internal plastic pipe, thereby forming a composite pipe. Molding is the result.

The above-mentioned drawing member has a diameter (D) of a drawing groove (203 ') formed in the first drawing member (203).
1) The diameter (D2) of the extraction groove (204 ′) formed in the second extraction member (204) is smaller than that of the second extraction member (204).
The diameter (D3) of the extraction groove (205 ') formed on the third extraction member (205) is smaller than the diameter (D2) of the extraction groove (204') formed on the extraction member (204). doing. And the above-mentioned guide die (202)
The first extraction member (203), the second extraction member (204), and the third extraction member (205) attached to the support member (206) attached to the guide die (202) on the outer peripheral edge. The projections (203 "), (204"), (20
5 ″) are formed.

The drawing member is formed in a ring shape so that a metal pipe (Mp) formed outside the inner plastic pipe (Ip) passes therethrough, and the drawing member formed on the drawing member is formed. The groove is made of carbon so that the surface of the drawn groove has a smooth surface so that appropriate friction occurs with the passing metal pipe (Mp). The support member (206) is fixed to the guide die (202) by fixing bolts (207) so as to prevent the support member (206) from being detached.

Then, as shown in FIG. 10, the metal pipe (Mp) moves smoothly on the front surface of the first drawing member (203), the second drawing member (204), and the third drawing member (205). An arcuate guide surface (208) is formed for this purpose, and a metal pipe (Mp) is also provided on the guide die (202).
The guide surface (209) is formed so that the can move smoothly.

Then, as shown in FIG. 13, when the metal pipe (Mp) passes through the drawing member mounted on the guide die (202), the metal pipe (Mp) is supplied by an oil supply pump (210) to prevent the metal pipe (Mp) from being damaged. An oil supply groove (210 ') for supplying the extracted drawing oil to the surface of the metal pipe (Mp) is formed in the guide die (202).
An arc-shaped guide surface (211) is formed at 0 ') so that the metal pipe (Mp) to be moved is moved smoothly. A cleaning groove (213) for supplying cleaning water supplied by a cleaning pump (212) for removing the drawing oil attached to the surface of the formed metal pipe (Ip).
Are formed on the guide die (202).

The manufacturing method of the present invention using the apparatus for manufacturing a composite pipe of the present invention configured as described above will be described as follows. FIG. 14 is a flowchart illustrating a method of manufacturing a composite pipe according to the present invention, where S indicates a step (STEP). An adhesive (A) is applied to the internal plastic pipe (Ip) formed by the internal plastic pipe forming means (101), which extrudes plastic by an extruder to form the internal plastic pipe (Ip), and this is cooled by a cooling means ( 102), the internal plastic pipe (Ip) cooled as described above is drawn by a drawing machine as a drawing means (103), and wound by a winding machine as a winding means (104). It consists of a winding step of winding a take-up roll.

First, the internal plastic pipe supply means S
1 unwinds the internal plastic pipe (Ip) wound on the winding roll and moves it to the metal pipe forming means (107). Then, the metal strip supplying step S2 unwinds the metal strip (Ms) wound on the roll to form the metal pipe forming means (1).
07). Then, the metal pipe forming step S
3 shows that the metal plastic supplied in the metal band supply step S2 is as the internal plastic pipe (Ip) supplied as described above passes through the die (D) which is a metal pipe forming means as shown in FIG. The cross section is made circular while the band (Ms) is gradually bent by the guide groove (201) formed in the die (D), and a metal pipe (Mp) is formed around the inner plastic pipe (Ip).

In the metal pipe welding step S4, the metal pipe (Mp) is formed around the inner plastic pipe (Ip) by the metal pipe (Mp) forming means (107).
Metal strip (Ms) so that p) remains molded
Are welded to each other, and the portions that are butted by the welding machine are welded.

In the metal pipe drawing step S5, the metal pipe (M) formed in the metal pipe forming step S3 is formed.
p) is not in close contact with the peripheral surface of the inner plastic pipe (Ip).
By pulling out p), the metal pipe (Mp) was brought into close contact with the internal plastic pipe (Ip) as the inner diameter of the metal pipe (Mp) became smaller.

The above-described metal pipe drawing step S5 will be specifically described as follows. As shown in FIG. 6, the metal pipe (Mp) formed through the die (D) and welded by the welding means (108) passes through the guide die (202) as shown in FIG. The above guide die (2
02) passes through the pull-out member mounted inside the above-mentioned guide die (202) while being pulled by the caterpillar.

The above-mentioned drawing member is a first drawing member (20
3), a second extraction member (204), and a third extraction member (2).
05) are sequentially installed, and the metal pipe is closely adhered to the internal plastic pipe while sequentially passing through the above-described drawing member, thereby forming a composite pipe. When sequentially passing through the drawing member as described above, the drawing oil is sprayed to the outer surface of the metal pipe through the oil supply groove by the operation of the oil supply pump, thereby preventing the formed metal pipe from being damaged.

The above-mentioned drawing member has a diameter (D) of a drawing groove (203 ') formed in the first drawing member (203).
The diameter (D2) of the extraction groove (204 ') formed in the second extraction member (204) is smaller than 1), and the diameter (D2) of the extraction groove (204') formed in the above-described extraction member (204). Since the diameter (D3) of the extraction groove (205 ') formed in the third extraction member (205) is smaller than that of D1), the above-described metal pipe (Mp) is not used in the first extraction member (205).
The metal pipe (Mp) is stretched while passing through the drawing member (203), the second drawing member (204), and the third drawing member (205), so that the inside diameter of the metal pipe (Mp) is reduced and the metal pipe (Mp) is closely attached to the internal plastic pipe.

The washing step S6 removes the oil drawn from the metal pipe drawing step D5. That is, the drawing oil attached to the formed metal pipe (Mp) is washed by the washing water supplied from the washing pump (212) through the washing groove (213).

The external plastic pipe molding step S7 comprises:
From the state where the metal pipe (Mp) is in close contact with the inner plastic pipe (Ip) by the above-mentioned drawing step, plastic is extruded on the outer peripheral surface of the metal pipe (Mp) by an extruder to form an external plastic pipe (Op). Thus, the composite pipe (Cp) is formed. The adhesive (A) is melted in the composite pipe (Cp) thus formed while passing through the heating furnace, and the joining between the plastic pipe and the metal pipe becomes tight.

In the composite pipe winding step S8, the composite pipe (Cp) formed by the external plastic pipe forming means (110) is wound on a winding roll. The composite pipe is roll-wound in a winding step or cut to a predetermined length by cutting means.

[0037]

As described above, the composite pipe manufacturing apparatus according to the present invention has not only a simple structure but also a good adhesion between a metal pipe and a plastic pipe, so that it can be hermetically bonded. Therefore, there is an extremely excellent effect that the quality of the formed composite pipe can be improved, and since the manufacturing apparatus is simply configured, the cost of the manufacturing apparatus can be reduced, and the installation of the manufacturing apparatus can be easily performed. Can be simplified. On the other hand, the composite pipe manufactured according to the present invention is easy and simple to manufacture, so that it has the effect of improving productivity and removing defective products.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view of a composite pipe.

FIG. 3 is a plan view of a metal pipe forming system in a conventional composite pipe manufacturing system.

4 (A), (B), (C) are 4A-4A, FIG.
Sectional view of line 4B-4B, 4C-4C

FIG. 5 is a block diagram of a composite pipe manufacturing system according to the present invention.

FIG. 6 is a longitudinal sectional view of a die for forming a metal pipe according to the present invention.

FIGS. 7A, 7B and 7C are 7A-7A of FIG.
Sectional view of line 7B-7B, line 7C-7C

FIG. 8 is a front view of a state in which abutting portions of both end surfaces of a metal band are flattened by a pressure roller during a metal pipe forming process according to the present invention.

FIG. 9 is a vertical cross-sectional view of the guide die of the drawing means cut away.

FIG. 10 is an enlarged view of a main part of FIG. 9;

FIG. 11 is a perspective view of a drawing member for drawing a metal pipe according to the present invention.

FIG. 12 is a sectional view taken along line 12A-12A in FIG. 10;

FIG. 13 is a cross-sectional view showing an oil supply groove and a cleaning groove formed in a guide die.

FIG. 14 is a flowchart of the composite pipe manufacturing method of the present invention.

[Explanation of symbols]

 107 Metal pipe forming means 108 Welding means 109 Metal pipe pulling means 202 Guide die 203, 204, 205 Pulling member 206 Supporting member 208, 209 Arc guide surface Ip Internal plastic pipe Ms Metal band Mp Metal pipe Op External plastic pipe PR Pressing roll

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification code FI B29L 9:00 (73) Patent holder 598169402 854-1, MALYONG-LEE, SEOSU-MYEUN, KUSAN AN-SI, JYUNLABUK-DO (56) References JP-A-58-41612 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B21C 37/06 B29C 47/02 B29D 23/00

Claims (4)

(57) [Claims] 1. Means for supplying an internal plastic pipe (Ip) wound on a roll formed by an extruder and a metal band (Ms) wound on a roll to a metal pipe forming machine, and this supply means (M
s) to form a metal pipe (Mp) while covering the internal plastic pipe (Ip) supplied by the die (D). Welding means for welding both end faces of the metal strip (Ms) with a welding machine to form the pipe (Mp), and the metal pipe (Mp) welded by the welding means on the peripheral surface of the internal plastic pipe (Ip). Metal pipe pulling means for pulling the metal pipe (Mp) by a caterpillar so as to pass through the pulling member (202) so that the metal pipe (Mp) passes through the pulling member (202). The plastic pipe (I
An apparatus for manufacturing a composite pipe, wherein an external plastic pipe (Op) is formed by an extruder on the metal pipe (Mp) in a state of being in close contact with the metal pipe (Mp). 2. When a metal pipe (Mp) is formed by said metal pipe forming means, a pressure roll (PR) that presses abutting portions of the metal strip (Ms) so as to improve the abutment of both end faces. 2. The composite pipe manufacturing apparatus according to claim 1, further comprising: 3. The metal pipe extracting means includes a first extracting member (203), a second extracting member (204), and a third extracting member (205) sequentially installed in a guide die (202). The extraction groove (20) formed in the first extraction member (203).
The diameter (D2) of the extraction groove (204 ') formed in the second extraction member (204) is smaller than the diameter (D1) of 3'), and the extraction groove formed in the second extraction member (204). The diameter (D2) of the extraction groove (205 ') formed in the third extraction member (205) is larger than the diameter (D2) of the (204').
3. The composite pipe manufacturing apparatus according to claim 1, wherein 3) is reduced. 4. A supply step of supplying an internal plastic pipe (Ip) formed by an extruder and wound on a roll and a metal strip (Ms) wound on a roll to a metal pipe forming machine, and this supply step. Strip supplied by Ms. (Ms)
Forming a metal pipe (Mp) while covering the internal plastic pipe (Ip) supplied by the die (D), wherein the metal pipe (Mp) is formed. A welding step of welding both end faces of the metal strip (Ms) with a welding machine so as to maintain a state in which the metal pipe (Mp) is formed in the step (a), and connecting the metal pipe (Mp) welded by this welding step to an internal plastic pipe. A metal pipe drawing step in which the metal pipe (Mp) is stretched by being drawn by a caterpillar so as to pass through the drawing member (202) so that the metal pipe (Mp) is drawn in close contact with the peripheral surface of (Ip); The formed metal pipe (Mp) is stretched while being pulled and is in close contact with the inner plastic pipe (Ip).
forming an external plastic pipe (Op) on the external plastic pipe (Op) by means of an extruder.