Automatic extruder filter screen replacing device capable of keeping continuous material flow

Abstract

The invention discloses an automatic extruder filter screen replacing device capable of keeping continuous material flow. The automatic extruder filter screen replacing device comprises a flow channelswitching mechanism and a filter mesh replacing mechanism; the filter mesh replacing mechanism comprises a base, the base is provided with a protrusive gear ring portion, a fixing inner gear ring isarranged on the inner hole wall of the protrusive gear ring portion, a fixing outer gear ring is arranged on the outer cylindrical face, a first driving gear is arranged at the central axis of the base in a rotary driving mode, and at least n first planetary filter mesh frame units are rotatably and symmetrically arranged between the first driving gear and the fixing inner gear ring in a meshing mode; and the outer cylindrical face of the base is rotatably provided with a rotatable inner gear ring, and at least m second planetary filter mesh frame units are rotatably and symmetrically arrangedbetween the fixing outer gear ring and the rotatable inner gear ring in a meshing mode. According to the automatic extruder filter screen replacing device capable of keeping the continuous material flow, the two rings of planetary gear mechanisms concentrically rotating cooperate with the flow channel switching mechanism, therefore, automatic filter screen replacing is achieved, and meanwhile thematerial flow can continuously flow at the constant pressure and flow speed.

Description

technical field [0001] The invention relates to the technical field of extruders, in particular to an automatic filter screen replacement device for extruders with continuous material flow. Background technique [0002] In the plasticizing process, in order to filter out impurities so that the pure melt can enter the molding die smoothly, a filter is installed between the melt pump and the molding die to prevent impurities and foreign matter from entering the molding die. As the filter continues to accumulate impurities, the head pressure increases and the flow rate decreases. When the pressure exceeds a certain level, the filter must be replaced to solve this state. Especially when plastic recycled materials are used, the replacement of the filter screen is more frequent. Every time the filter screen is replaced, the machine must be shut down, and the replacement filter is from the mold removal head->cleaning->new mesh->reheating->drawing the billet->normal e...

AI Technical Summary

Problems solved by technology

[0006] (3) The seal of the screen changer body adopts a sealing ring, which is easy to wear and leak

Mechanical seals require a combination of careful design and precise processing technology, which makes people daunted, and it is more difficult to maintain high-precision sealing for a long time in the production process

Therefore, the maintenance cost is high, but the efficiency is not necessarily high

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