Vacuum device for double-screw extruder

Abstract

The invention discloses a vacuum device for a double-screw extruder, which comprises the double-screw extruder (1). The double-screw extruder (1) is provided with an exhaust port (2) which is respectively connected with a first buffer tank (51) and a second buffer tank (52) through vacuum pipelines (4), the first buffer tank (51) and the second buffer tank (52) are respectively communicated with a vacuum pump (7) through the vacuum pipelines (4) arranged outside the first buffer tank and the second buffer tank, and the vacuum pipelines (4) are provided with pipeline switching valves (11). By the aid of the two buffer tanks and the pipeline switching valves which are additionally mounted on the vacuum pipelines and used for switching the two buffer tanks, quality reduction of products during cleaning of the buffer tanks is avoided. The vacuum device for the double-screw extruder has the advantages of simple structure, low manufacturing cost, evident economic benefits and suitability for popularization and use, and stability and continuity of production are guaranteed.

Description

technical field [0001] The invention relates to a vacuum device, in particular to a vacuum device for a twin-screw extruder which can maintain continuous and stable production. Background technique [0002] Twin-screw extruder is the key equipment in the production of polyethylene separator, it mixes, melts and conveys the formula materials. Some gas volatiles will be produced in the process of melting and conveying. If these gas volatiles follow the material to the die, it will easily lead to holes in the polyethylene separator and even the phenomenon of sticking rolls. Since the material must be kept in the production process Vacuum mode, so a vacuum device must be set on the twin-screw extruder to extract these gas volatiles. In addition, because a small amount of material debris will be pumped to the vacuum pump along with the gas volatiles during the vacuum extraction process, if the exhaust port of the twin-screw extruder is directly connected to the vacuum pump, the...

AI Technical Summary

Problems solved by technology

This kind of vacuum device better solves the problem of the congestion of the vacuum pump 7, but because the production of the polyethylene separator is continuous, generally speaking, the impurities extracted by the vacuum pump 7 will fill the buffer tank 5 after about 12 hours of continuous production. At this time, the buffer tank 5 must be cleaned up, and during the cleaning process of the buffer tank 5, the vacuum pump 7 must stop running until the buffer tank 5 is put into use again, and the stoppage of the vacuum pump 7 will cause the polyethylene partition produced during this period drop in quality

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