Manufacture process and equipment for steel wire reinforced composite plastic pipe

Abstract

The invention relates to a method for steel wire strengthened composite plastic tube, wherein it comprises: continuously extruding the polymer core tube; feeding it into steel wire coiler or steel wire weaver, to coil or weave at least one layer of steel wire strengthened element and composite polymer layer, at left rotation direction and right rotation direction; and it is characterized in that: it uses the high-frequency heater, between the steel wire coiler or weaver and the polymer composite device or between the coiler and the weaver, to heat the coiled or weaved steel wire strengthened element. The invention has better heating effect, without deforming the core tube; and the core tube can be thin, to reduce the cost. And the invention also provides a relative device.

Description

Technical field: [0001] The present invention is related to the method and device for manufacturing steel wire reinforced composite plastic pipes, in particular to the method for manufacturing steel wire reinforced composite plastic pipes that can directly perform non-contact high-frequency heating treatment on the steel wire reinforcements spirally wound or braided on the outer periphery of the core pipe related to the device. Background technique: [0002] In recent years, increasing winding metal wires in plastic pipes to strengthen pipe strength has been reported and used, as disclosed in the CN2465937Y scheme "in the entry position of the core pipe (1) and the secondary plastic layer used to wrap the outer plastic layer outside it". Around the pipe channel between the extrusion mechanism (8), at least one rotating wire winding unit and a heating unit for spirally winding the metal wire outside the core pipe (1) are arranged in sequence" (see claim 1), in this scheme , ...

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Problems solved by technology

[0002] In recent years, increasing winding metal wires in plastic pipes to strengthen pipe strength has been reported and used, as disclosed in the CN2465937Y scheme "in the entry position of the core pipe (1) and the secondary plastic layer used to wrap the outer plastic layer outside it". Around the pipe channel between the extrusion mechanism (8), at least one rotating wire winding unit and a heating unit for spirally winding the metal wire outside the core pipe (1) are arranged in sequence" (see claim 1), in this scheme , "The heating unit located after the rotary winding unit mentioned in the above structure" "heats the core tube with the wire wound" (see the first and second lines of the second paragraph on page 2 of the specification), the heating units are all It is an electric oven or a rotary quartz infrared heater (see paragraph 3 on page 2 of its instruction manual). Obviously, when the steel wire is heated, the plastic core tube is also forcibly heated, so that the core tube is easily deformed and even Therefore, the wall thickness of the core tube has to be greatly increased, and the pressure bearing capacity of this kind of steel wire reinforced composite plastic pipe is almost 70% of which is borne by the steel wire reinforcement. Increasing the wall thickness of the core tube is important for improving the composite plastic pipe The contribution of pressure bearing capacity is limited, but it greatly increases the production cost of composite plastic pipes, which is very uneconomical

And although the high-frequency heating device is disclosed in the CN2543701Y scheme, what is disclosed in the scheme is that the high-frequency heating device is used to heat the steel wire released from the steel wire winding machine and not wound on the surface of the core tube, and the heater is not directly heated. Instead of heating the steel wire, the "circular heating that forms a closed loop in contact with the steel wire" is used. This heating method of heating the circular ring and then transferring the heat to the steel wire by the circular ring increases the heating power and wastes energy. The heating speed is low, the heating effect of the steel wire is not good, which affects the production speed of the pipe, and the heated steel wire is wound on the surface of the core tube. Due to the influence of the winding force, the steel wire is easy to damage the surface of the core tube and even collapse or strangle the core tube. Wear, so that the production can not be carried out normally

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