Technique and equipment for processing reinforced thermoplastic plastic pipe

Abstract

The invention provides a technique and an apparatus for producing a reinforced thermoplastic pipe. The technique comprises the following steps: 1) sending granular PE to a hopper of an extruding machine by negative pressure; 2) heating PE plastic by a first extruding machine, and continuously extruding the PE plastic by a die head with high pressure; 3) cooling the molten PE by water into a PE internal pipe under negative pressure through a vacuum calibrating sleeve of a vacuum water tank; 4) cooling and forming the PE internal pipe continuously in a spray water tank; 5) drying the surface of the PE internal pipe taken from the spray water tank by a first air cooler; 6) pulling the PE internal pipe continuously and stably by a hauling machine which provides power for forming the PE internal pipe; 7) winding a plastic covered reinforcing band made of steel wire or fiber yarn twisted ropes by a winding machine with constant tensile force in opposite directions respectively on the PE internal pipe or the outermost layer of the PE internal pipe; 8) wrapping the molten PE plastic on the outside of the wound reinforcing band through an external composite die head by a second extruding machine to form a wrapped RTP pipe; 9) spraying and cooling to form the wrapped RTP pipe in the water tank; and 10) drying the surface of the RTP pipe taken from the water tank by a second air cooler. The technique is simple and feasible. The apparatus has simple structure, good operating performance and stable and reliable operation.

Description

technical field [0001] The invention relates to a production process and equipment for reinforced thermoplastic pipes (RTP pipes, RTP-Reinforced Thermoplastic Pipes for short) used in the fields of gas, chemical industry, petroleum, natural gas, mines, buried power pipes, etc., belonging to the production process of RTP pipes and equipment innovations. Background technique [0002] Existing pipes used in gas, chemical, petroleum, natural gas, mining, buried power pipes and other fields are generally made of a single plastic raw material. In order to achieve a certain pressure, not only are there many consumables, but the pressure cannot be high. For this reason, some manufacturers use steel wire or fiber wire to be directly wound on the inner pipe to enhance the pressure bearing of the pipe. This method is to wind one layer on the left and right, and the steel wire or fiber wire wound on each layer is limited, and the RTP pipe cannot achieve high blasting performance. press...

AI Technical Summary

Problems solved by technology

[0002] Existing pipes used in gas, chemical, petroleum, natural gas, mining, buried power pipes and other fields are generally made of a single plastic raw material. In order to achieve a certain pressure, not only are there many consumables, but the pressure cannot be high.

For this reason, some manufacturers use steel wire or fiber wire to be directly wound on the inner pipe to enhance the pressure bearing of the pipe. This method is to wind one layer on the left and right, and the steel wire or fiber wire wound on each layer is limited, and the RTP pipe cannot achieve high blasting performance. pressure

In addition, it is not easy to ensure uniform force, which is not conducive to heat resistance

In addition, there are many kinds of manufacturing methods for existing composite pipes. The common method is to continuously wind the outer surface of the pipe with fibers. After heating and tensioning, the fibers are wound on the thermoplastic pipe that rotates through the mandrel. Among them, on the one hand, the mandrel is required to rotate, and on the other hand, in order to improve the pressure bearing capacity, it is necessary to select a mandrel with high strength and high price, and require the mandrel to be processed better, so as to increase the processing cost of the pipe.

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