JPS5961522A - Manufacture of fluid transportation pipe - Google Patents

Abstract

PURPOSE:To obtain a transportation pipe of high performance without applying torsional stress to the pipe and preventing loosening of the end by winding a metallic strip around a plastic pipe while preforming to smaller diameter than outer diameter of the pipe. CONSTITUTION:In winding a metallic strip 3 by rotating a plastic pipe 2, a bend of smaller diameter D2 than diameter of D1 of the pipe is given to the metallic strip 3 by a roll 8 and adjustable rolls 9, 9'. Consequently, the metallic strip 3 becomes an internal pressure strengthening layer 4, and as there is no residual torsional stress in the pipe 2, the capacity of the pipe 2 is increased. Since the metallic strip does not get loose at the end of the pipe 2, lowering of strength of the end part is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a modified 1.1 fluid transport pipe for transporting water, oil, gas, etc. under sieve pressure.

Conventionally, in order to send a high pressure flow (+'c II'i+θ
Steel pipes are being used for transportation of C bodies, and recently the topography has been covered with glass pipes, which are easy to install.
(Joyon can be used - C is c, ' Kata V Kounami's # sound ke is received! 76th level 1 τ 1 near or used on the riff @V
L-n This 0J vulgarity'/f: It is advantageous to have a Flasnac hJ example tube. Generally, this neck is L1+4if+i
At the sending end 1, as shown in Fig. 1, an internal pressure reinforcing layer 4 is formed by wrapping several layers of metal bands in a conical shape on top of the plastic pipe 2, and furthermore, as shown in Figure 1, an internal pressure reinforcing layer 4 is formed. In order to withstand the axial tension, a plurality of gold threads or strips were twisted at a loose pitch and a plastic jacket 6 was applied. In this conventional manufacturing method, the metal strip is wrapped around the plastic pipe using a tape winding machine VC, but as the thickness of the metal strip becomes too thick, the force required for wrapping becomes too thick. Residual strain is left on the plastic pipe 2 due to torsional stress, which deteriorates the performance of the plastic pipe 2, and when the pipe is cut for the purpose of connecting the ζ end wire, the metal paulownia band remains with vM strain t1.
Therefore, there was a drawback that the mechanical strength of the end of the Song Dynasty was reduced by fraying.The purpose of the present invention is to prevent the plastic pipe V from being subjected to torsional stress, so that the former Emperor Jinchen could easily melt at the end of the Song Dynasty. It is an object of the present invention to provide a method by which a fluid transfer tube having ten or more performance can be manufactured in a single unit.

Embodiments of the present invention Referring to the drawings, the second problem is that the method of the present invention is not schematically described, and the metal band 3' ( Il - Reformer 7 transforms and expands the roll by 4 lengths. Reformer 7 tr, r, tl supplied to flasp cube r] 2
, the first roller 8 which is in contact with the inner surface VC of the gold lees band 3, and the gold &14' on both sides of this first roller. If 3 is in contact with the second and third rollers 9°9' and 3, which are in contact with the outer surface of the roller. The plastic pipe 2 rotates around its own center VC, and the reformer 7 rotates along a line parallel to the axis of the plastic pipe. fall t20
The rollers 9, 9' are positioned in the direction of the arrow with respect to the first roller 8 (71). The 191 feet are supplied to the 11t-C plastic pipe 2, and the metal paulownia belt is 3t in length.
The preform of this metal band is made to fit the diameter of the non-stick pipe 2, Cυ is also slightly embarrassing 1, and the diameter IJ2. With this kind of VC-J-, it is difficult to handle large punching force because the metal is wrapped with 4 layers and the ItG layer is applied to the glass pipe 2.
3 total length V stiffness 1 (attached to the glass pipe 2? f#
2, so that the metal band 3 does not unravel at the end portion.0 The metal wire or band 5 is applied in a conventional manner on top of the internal pressure reinforcing layer 4 formed by this process, and is also coated with a plastic outer covering. 6 by extrusion VC.

In the above embodiment, the plastic pipe 2 is moved along the axis [1
Of course, the reformer 7 may also be rotatable.

In the VC twist of the present invention, the metal band forming the internal pressure reinforcing layer is preformed to have an outer diameter smaller than the outer diameter of the plastic pipe, and the metal band is preformed to have a smaller outer diameter than the outer diameter of the plastic pipe. Since there is no need to apply pressure, the performance is the same without causing any residual strain due to twisting in the glass pine.In addition, since Kinjima Wi applies compression stress to the plastic pipe, when the internal pressure of the glass pipe VL is 71) The strength is the same as above, and there is also the practical benefit that the strength of the terminal part is the same as above without the metal band coming undone when connecting the terminals.

[Brief explanation of drawings]

Figure 1 is a schematic cross-sectional view of a fluid transport pipe, and Figure 2 is a schematic explanatory diagram of the method of the present invention.・Plastic sleeve, 3... Metal band, 4... Internal pressure reinforcing layer, 7... Preformer, 8, 9, 9
'······roller. Figure 1

Claims (1)

[Claims] Kanasu 'if' T-shaped spiral V-shaped winding & J on the flasp tufted pipe to reinforce internal pressure A method for producing a fluid transport pipe characterized by preforming a plastic pipe with a small diameter (l:9) before winding it around a plastic pipe.