Non-stop screen exchanger and plastic extruder

Abstract

The invention discloses a non-stop screen exchanger, belongs to the field of plastic processing machinery, and aims at solving the problem in the prior art that air bubbles can be mixed in plastic melt. According to the technical scheme for solving the problem, the non-stop screen exchanger mainly comprises a main body, wherein a feeding opening, a first channel, a second channel and a discharge opening are formed in the main body; a feeding valve core is arranged at the communicated part of the feeding opening, the first channel and the second channel; a discharge valve core is arranged at the communicated part of the discharge opening, the first channel and the second channel; an exhaust hole which is communicated with the outside is formed in the main body; an exhaust groove is formed in the peripheral side wall of the discharge valve core and is located on the back surface of the discharge valve core opposite to a first overflow groove; and when one of the first channel and the second channel is communicated with the discharge opening by the first overflow groove, the other one of the first channel and the second channel is communicated with the exhaust hole by the exhaust groove. The non-stop screen exchanger is mainly applied to a plastic extruding machine. In addition, the invention further provides a plastic extruder, which comprises the non-stop screen exchanger.

Description

technical field [0001] The invention relates to plastic processing machinery, in particular to a non-stop screen changer and a plastic extruder using the non-stop screen changer. Background technique [0002] In order to improve the quality of plastic products, a filter device will be connected to the front end of the extrusion screw of the plastic extruder to filter the plastic melt. After the extruder has been working for a long time, the filter device will adhere to a certain degree of impurities. The passing capacity is reduced, so the filter screen of the filter device needs to be replaced. The existing utility model patent No. 201320578822.9 discloses a long-term filter cartridge non-stop screen changer, including the main body of the screen changer, the screen changer There is a feeding chamber on one side of the main body. There is an inner chamber in the main body of the screen changer. The feeding chamber communicates with the inner chamber. The inner chamber is co...

AI Technical Summary

Problems solved by technology

The above-mentioned patent can realize the function of changing the screen without stopping the machine during the extrusion continuous production process, but setting the exhaust valve on the filter element cannot discharge the air in the part of the inner cavity between the filter element and the discharge cavity, and cannot ensure that the plastic When the melt flows to this position, it will not mix with the residual air, so it may cause the plastic melt to contain air bubbles and affect the quality of the plastic product

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