Two-way switching type non-fluctuation screen exchanger

Abstract

The invention belongs to the field of screen exchangers, and particularly relates to a two-way switching type non-fluctuation screen exchanger. The two-way switching type non-fluctuation screen exchanger comprises a screen exchanger box; two independent filtering mechanisms are arranged inside the screen exchanger box; a main feeding inlet is formed in the front end face of the screen exchanger box; two feeding channels are led out of the main feeding inlet; each feeding channel communicates with one corresponding filtering mechanism; a main discharging outlet is formed in the rear end face of the screen exchanger box; two discharging channels are also led out of the main discharging outlet; each discharging channel communicates with one corresponding filtering mechanism; and the two feeding channels and the two discharging channels are each provided with a control valve assembly. The two-way switching type non-fluctuation screen exchanger has the advantages of exchanging screens conveniently without stopping, automatically exhausting air, and being accurate to control due to the small material leaking face, free of fluctuation and high in 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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