Equidirectional parallel double-screw plastic extruder unit for double-wall corrugated pipe

Abstract

The invention provides an equidirectional parallel double-screw plastic extruder unit for a double-wall corrugated pipe. The equidirectional parallel double-screw plastic extruder unit comprises a twin-screw super-high torque gear box, split combination machine barrels and combination screws; the combination screws comprise two screws having identical structures and diameters; two shaft rods of the combination screws are connected with two output shafts of the twin-screw super-high torque gear box correspondingly; and the split combination machine barrels cooperating with the two combination screws are arranged on the outer sides of the two combination screws correspondingly. Through optimization on the prior art, inner layer and outer layer plastic materials of the double-wall corrugatedpipe can be provided at the same time, the equidirectional parallel double-screw plastic extruder unit is simple in structure and good in plastification effect, the granulating process is omitted, andthe double-screw plastic extruder unit can directly use grains or powder to produce the double-wall corrugated pipe, so that the plastification quality of the double-wall corrugated pipe is improvedsubstantially, the pipe production cost is lowered significantly, and the pipe quality is improved substantially.

Description

technical field [0001] The invention belongs to the field of plastic corrugated pipe manufacturing, in particular to a co-rotating parallel twin-screw plastic extrusion unit for double-wall corrugated pipes. Background technique [0002] At present, the vast majority of polyolefin double-wall plastic corrugated pipes on the market generally use single-screw plastic extruders, and some use conical counter-rotating twin-screw plastic extruders, or single-group co-rotating twin-screw plastic extruders. The disadvantages of using a single-screw plastic extruder to produce polyolefin double-wall plastic corrugated pipes are high energy consumption, poor formula adaptability, and cannot be directly produced with powder materials, but pellets must be used. The conical counter-rotating twin-screw plastic extruder can be directly produced by powder. The disadvantage is that the structure is complex, the length-to-diameter ratio of the screw is limited (the corresponding output will b...

AI Technical Summary

Problems solved by technology

The disadvantages of using a single-screw plastic extruder to produce polyolefin double-wall plastic corrugated pipes are high energy consumption, poor formula adaptability, and cannot be directly produced with powder materials, but must be made of pellets

The conical counter-rotating twin-screw plastic extruder can be directly produced by powder. The disadvantage is that the structure is complex, the length-to-diameter ratio of the screw is limited (the corresponding output will be limited), and the direct production of pellets will cause great damage to the screw.

The service life of the screw will be greatly reduced, and the plasticizing effect will be poor due to the short length-to-diameter ratio of the screw

The disadvantage of using a single group co-rotating twin-screw plastic extruder is that only one plastic extruder head is used for production, which cannot meet the conditions for simultaneously producing the inner and outer walls of double-walled plastic corrugated pipes, and the cost is too high

Images