Polygonal plastic coating device for steel pipe and polygonal spiral plastic-coated steel pipe

Abstract

The invention discloses a polygonal plastic coating device for a steel pipe and a polygonal spiral plastic-coated steel pipe. The polygonal plastic coating device for the steel pipe comprises a die sleeve, a plastic extruding connector and a polygonal tooth die, wherein the die sleeve is located at the position of a machine head of a single-screw plastic extruding machine; a cavity is formed in the die sleeve; the rear end of the cavity is open; the cavity is communicated with a machine head extruding channel of the single-screw plastic extruding machine through the opening in the rear end; the front part of the plastic extruding connector is located in the cavity and does not make contact with the wall of the cavity; the rear end of the plastic extruding connector is located outside the die sleeve; a groove is formed in the front end of the die sleeve; the polygonal tooth die is located in the groove and can rotate in the groove; a regular polygon forming hole is formed in the centerof the polygonal tooth die and communicated with the cavity; a through hole is formed in the plastic extruding connector; the through hole and the forming hole are concentric; and a steel pipe body isinserted from the rear end of the through hole and penetrates out of the forming hole to form the polygonal spiral plastic-coated steel pipe. The polygonal spiral plastic-coated steel pipe can be directly formed through the polygonal plastic coating device for the steel pipe provided by the invention, the appearance is attractive, and climbing growth of climbing plants can be promoted when the polygonal spiral plastic-coated steel pipe is used for garden planting.

Description

technical field [0001] The invention relates to a steel pipe polygonal plastic-coating device and a polygonal spiral plastic-coated steel pipe. Background technique [0002] There are two types of existing plastic-coated steel pipes. Both types of plastic-coated steel pipes are plastic-coated by ordinary extruders. One is a smooth surface, and the other is to add several plastic lines on the plastic-coated surface. , when the plastic-coated steel pipe is used for garden planting, the smooth surface of the plastic-coated steel pipe is not conducive to the climbing and growth of plants, and although the plastic-coated steel pipe with plastic lines can promote the climbing and growth of plants to a certain extent, but in the plastic-coated steel pipe After processing, another plastic wire needs to be wound. However, because the cost of winding plastic wire is low, the processing method is relatively simple and requires low requirements, and it can promote the climbing and grow...

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