A two-way switchable waveless screen changer

Abstract

The invention belongs to the field of screen changers, and particularly refers to a two-way switchable non-fluctuating screen changer, which includes a screen changer box body, and two sets of mutually independent filter mechanisms are arranged in the screen changer box body. The screen changer box The front surface of the body is provided with a general feed port, which is divided into two feed channels, and each feed channel is respectively connected with a set of filter mechanisms, and the rear end of the screen changer box is provided with a total discharge port. , the total discharge port is also divided into two discharge passages, each discharge passage is respectively connected with a set of filter mechanisms; two feed passages and two discharge passages are provided with a group of control valve assemblies; the present invention has The screen can be changed without stopping the machine, it is convenient to change the screen, automatic exhaust, small leakage area, precise control, no fluctuation, and high production efficiency.

Description

technical field [0001] The invention belongs to the field of screen changers, in particular to a novel two-way switchable fluctuation-free screen changer. Background technique [0002] In the process of plastic extrusion, the plastic melt is plasticized and heated for a long time, and there will be decomposition residues in the melt, plus impurities in the raw materials. Once they enter the extruder head, they will cause flow channel Blockage, plastic products have defects, or even cannot be produced normally; in order to filter out impurities and make the pure melt enter the extrusion molding head smoothly, a filter is usually installed between the screw head and the extrusion molding head for Prevent impurities and foreign matter from entering the molding head; as the extrusion time continues, the debris on the filter gradually accumulates, causing the pressure of the head to increase and the flow rate to decrease, and when the pressure exceeds a certain level, the filter ...

AI Technical Summary

Problems solved by technology

[0002] In the process of plastic extrusion, the plastic melt is plasticized and heated for a long time, and there will be decomposition residues in the melt, plus impurities in the raw materials. Once they enter the extruder head, they will cause flow channel Blockage, plastic products have defects, or even cannot be produced normally; in order to filter out impurities and make the pure melt enter the extrusion molding head smoothly, a filter is usually installed between the screw head and the extrusion molding head for Prevent impurities and foreign matter from entering the molding head; as the extrusion time continues, the debris on the filter gradually accumulates, causing the pressure of the head to increase and the flow rate to decrease, and when the pressure exceeds a certain level, the filter is broken. If the filter screen fails, it is necessary to stop the machine to replace the filter screen; from dismantling the mold head, cleaning, replacing the filter screen, reheating, pulling the billet to normal production and extrusion, the whole process of the operation ranges from tens of minutes to several hours. , resulting in raw material loss, energy waste, and increased production costs

[0003] There are also some screen changers on the market that do not need to be shut down to change the screen, but they will cause relatively strong fluctuations during the screen change process. Due to the sudden change of the impact force, the melt becomes unstable and the discharge is uneven. Easy to break and other problems, and it is prone to accidental dangers, which will affect the life of the screen changer

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