JPS62138230A - Preparation of coated pipe - Google Patents

Abstract

PURPOSE:To obtain a coated pipe reduced in the gap between an outer cover material and a metal pipe and excellent in heat insulating capacity, by coating a flexible metal pipe with the sheet like outer cover material made of a thermoplastic synthetic resin while molding said cover material. CONSTITUTION:A metal pipe 1 is delivered by a feed apparatus 3 and advances while receiving the coating of a slip agent by a slip agent coating part 4. An outer cover material 2 is sent to a molding guide part 6 by a drive apparatus so as to longitudinally follow the metal pipe 1. Both end surface parts opposed to each other of the outer cover material 2 covering the metal pipe 1 and passed through the molding guide part 6 are heated and melted by a heater 7 and subsequently sent to a molding die 8 along with the metal pipe 1 and both end surface parts thereof are fused. Next, the whole is cooled by a cooling pipe part to continuously prepare a coated pipe 9.

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a method for manufacturing a cladding tube in which a flexible metal tube such as a copper tube is coated with a heat insulating material made of a thermoplastic synthetic resin.

[Prior art 1] In order to manufacture flexible cladding tubes such as refrigerant copper tubes coated with a heat insulating material made of thermoplastic synthetic resin, a jacketed tube formed into a tubular shape with a heat insulating material is used. A method is adopted in which a flexible metal tube cut to approximately the same length as the jacket tube is inserted into the tube. However, in order to ease the resistance that may occur when inserting a flexible metal tube and to facilitate insertion, the gap formed between the jacket tube and the flexible metal tube must be made considerably larger. I needed to. [Problems to be Solved by the Invention] In the conventional method of inserting a flexible metal tube into a pre-formed jacket tube, the tip of the flexible metal tube may damage the inner wall of the jacket tube. This causes problems such as damage to the heat insulation properties of the cladding, and not only poor productivity but also a significant reduction in commercial value. [Means for Solving the Problems] The present invention solves the above problems. The object of the present invention is to provide a method for manufacturing a cladding tube that can coat a flexible metal tube after forming a sheet-like jacket material into a tube shape. It not only completely eliminates problems such as damage or tearing of the outer covering material, but also improves productivity, has good insulation performance, and has excellent commercial value. cladding tubes can be manufactured. Therefore, the above object of the present invention is to separately feed a flexible metal tube such as a copper tube and a sheet-like jacket material made of thermoplastic synthetic resin, and apply a slip agent to the surface of the traveling flexible metal tube. On the other hand, after shaping the above-mentioned jacket material so that its cross-sectional shape is arc-shaped, the jacket material is attached vertically to the flexible metal tube and sent to the forming guide section together with the flexible metal tube, and the After the outer covering material is wrapped in a flexible metal tube by the guide section, both opposing end surfaces of the outer covering material are heated and melted, and then the outer covering material is wrapped together with the flexible metal tube running through the outer covering material. This is accomplished by a method for producing a cladding tube in which the cladding material is sent to a forming die that shapes it into a tubular shape, and the outer covering material with both end faces welded to the forming die is taken off while being cooled.

【Example】

The manufacturing method of the present invention will be explained below with reference to the accompanying drawings. 1 is a flexible metal tube such as a copper tube (hereinafter simply referred to as a metal tube)
, 2 is a sheet-like outer covering material (hereinafter simply referred to as outer covering material) made of thermoplastic synthetic resin, and the metal tube 1 is fed by a known feeding device 3 having a straightening function to straighten the metal tube 1. The jacket material 2 is fed out and progresses after being coated with a slip agent such as silicone by a slip agent coating section 4 such as silicone installed on the traveling path.
It is bent into an arc shape by the drum-shaped bending roller unit 5, and advances toward the metal tube 1 which has passed through the slip agent application section 4. A drive device for feeding and traveling this outer cover material 2 will be described later. Next, the outer covering material 2 is attached vertically to the running metal tube 1 and sent to the forming guide section 6, and the outer covering material 2 is shaped into a tubular shape at the top by the forming guide section 6 while the metal tube 1 is being shaped. Opposite end surfaces 2a of the outer cover material 2 that has been encapsulated above and passed through the forming guide section 6
is heated and melted by a heater 7. Next, the outer cover material 2 is sent to a forming die 8 together with the running metal tube 1, and the both end surfaces 2a of the outer cover material 2 are butted and welded by the drawing part 8a which is the inlet of the forming die 8, and the outer cover material While forming the cladding material 2 into a tubular shape, the cladding material 2 sent out from the drawing section 8a is cooled by the cooling tube sections 8b and 8c, and the cladding tube 9 is continuously manufactured. The drive device for running the sheathing material 2 thus consists of an endless drive belt 11, 12, and this planar drive belt 11.
．． Reference numerals 12 are arranged above and below the cooling pipe parts 8b and 8c, which are a part of the forming die 8, and clamp the jacket material 2 of the cladding tube 9 sent out from the drawing part 8a, and convert the jacket material 2 into a metal tube. 1 and is designed to run independently. Cooling pipe parts 8b, 8c
The cooling pipes are bifurcated from the drawing section 8a, and cooling air is introduced into these cooling pipe sections 8b and 8c by known means to cool the jacket material 2 sent out from the drawing section 8a. The slip agent application section 4 is configured by providing a case 4a perpendicular to the running path of the metal tube 1, filling the case 4a with felt 4b mixed with a slip agent, and providing a window in the case 4a through which the metal tube 1 passes. A hole 4c is provided so that a slip agent is applied onto the metal tube 1 when the metal tube 1 runs in contact with the felt 4b. Further, the forming guide section 6 includes a tapered tube section 6a having a large opening at the front side, and a cylindrical tube section 6b connected to the tapered tube section 6a. The cylindrical tube section 6b functions as a guide section for smooth introduction of the material, and as a shaping section that shapes the jacket material 2 into a tubular shape in advance. The molding device 7 is bell-shaped and has a built-in heating wire, and its tapered tip 7d is inserted between the opposing end surfaces 28 of the sheathing material 2 to heat and melt both end surfaces 2a. In the production of the cladding tube described above, the outer cladding material 2 is held and travels by the drive belts 11 and 12 of the drive device 10.
is extended while receiving strong resistance when passing through the drawing part 8a of the forming die 8, and this extension is such that the jacket material 2
It will contract when it is released from 1.12.
therefore. If the metal tube 1 and the sheathing material 2 run through the forming die 8 at the same speed, a problem arises in that the cladding tube is ultimately manufactured with the metal tube 1 protruding from the sheathing material 2. As a method for preventing the occurrence of this problem, in the present invention, the drive bag ff
The take-up speed of the jacket material 2 by 1lo is about 10 to 20% faster than the feeding speed of the metal tube 1. In order to allow this speed difference, a slip agent is applied on the metal tube 1, and the The outer covering materials 2 are made to be able to travel at their respective set speeds without being influenced by each other.

【Effect of the invention】

The present invention, as described above, not only allows the cladding tube to be manufactured continuously, but also has the problem that the metal tube protrudes from the outer jacket material even when the cladding tube is sequentially cut to a fixed length in synchronization with the manufacturing process. This method has the advantage of completely preventing the occurrence of defects, and making it possible to efficiently manufacture cladding tubes with excellent commercial value.
Furthermore, according to the manufacturing method of the present invention, the work of shaping a sheet-like jacket material into a tube shape and the work of covering the metal tube with the jacket material can be performed simultaneously, so that It is possible to manufacture cladding tubes with reduced gaps and excellent thermal insulation performance, and by cutting the cladding tubes manufactured from the raw material supply to a specified length and individually cutting the cladding tubes of a predetermined length. Automation for consistently performing the winding operation can be easily realized, and is extremely effective in saving labor and increasing productivity.

[Brief explanation of drawings]

The drawings show an apparatus for carrying out the manufacturing method of the present invention, in which Fig. 1 is a side view, Fig. 2 is a perspective view of the main part, Fig. 3 is a cross-sectional view of the slip agent application part, and Fig. 4 is a molding It is a sectional view of a guide part. In the figure, 1 is a flexible metal tube, 2 is an outer cover material, 2a is an end surface part,
3 is a feeding device, 4 is a slip agent application section, 4a is a case,
4b is felt, 4c is a window hole, 5 is a bending roller device part,
6 is a forming guide part, 6a is a tapered pipe part, 6b is a cylindrical pipe part, 7 is a heater, 8 is a forming die, 8a is a drawing part, 8b
, 8c is a cooling pipe section, 9 is a cladding tube, 10 is a drive device, 11
．． 12 is a drive belt.

Claims (1)

[Claims] A flexible metal pipe such as a copper pipe and a sheet-like jacket material made of thermoplastic synthetic resin are sent out separately, and a slip agent is applied to the surface of the running flexible metal pipe, while the cross-sectional shape of the jacket material is After shaping the material into an arc shape, the outer covering material is placed vertically on a flexible metal tube and sent together with the flexible metal tube to a forming guide section, where the outer covering material is made flexible by the forming guide section. After encapsulating the outer covering material in a flexible metal tube, heating and melting the opposing end surfaces of the outer covering material,
Next, the outer covering material is sent together with the running flexible metal tube to a forming die that shapes the outer covering material into a tubular shape, and the outer covering material with both end surfaces welded is taken out while being cooled by the forming die. A method for manufacturing a cladding tube.