A plastic film extruder filter device with automatic slag discharge

Abstract

The invention belongs to the technical field of plastic film extruders, and relates to a filter device of an automatic-deslagging plastic film extruder. The filter device comprises a shell, a filter disc, a rotating device, filter sheets, a filter sheet replacement window, a window cover, a feed port and a discharge port, wherein a feed channel positioned between the feed port and one filter sheet is provided with a deslagging channel; the discharge port of the deslagging channel is dead against the filter sheet which is not dead against the feed port; the deslagging channel or the feed channel is provided with a pressure sensor and a one-way valve; one side of the feed port is provided with a deslagging pipe communicated with the opposite surface of the filter sheet which is dead against the outlet of the deslagging channel; and a controller receives a pressure signal transmitted by the pressure sensor and controls the opening and closing of the one-way valve to achieve automatic deslagging. The filter device disclosed by the invention has the advantages of stability in product quality, long service life of the filter sheets, no raw material waste, non-stop automatic deslagging, time saving, high efficiency, low cost and suitability for plastic extrusion equipment of various types.

Description

technical field [0001] The invention belongs to the technical field of plastic film extruders, in particular to an automatic slag-discharging filter device for plastic film extruders. Background technique [0002] At present, the filter device of a plastic film extruder includes a housing, a filter disc in the housing, and a rotating device for the filter disc. The filter disc is evenly distributed with detachable filter sheets in the circumferential direction, and one side of the housing is provided with a feed port, The other side is provided with a discharge port, and the housing on the side of the feed port is provided with a filter replacement window and a window cover with a locking device. After the filter is damaged due to excessive pressure or material, open the filter The disadvantage of replacing the filter by replacing the window is that if the front side of the filter is blocked by impurities, the pressure of the film forming liquid in front of the filter will i...

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Problems solved by technology

[0002] At present, the filter device of a plastic film extruder includes a housing, a filter disc in the housing, and a rotating device for the filter disc. The filter disc is evenly distributed with detachable filter sheets in the circumferential direction, and one side of the housing is provided with a feed port, The other side is provided with a discharge port, and the housing on the side of the feed port is provided with a filter replacement window and a window cover with a locking device. After the filter is damaged due to excessive pressure or material, open the filter The disadvantage of replacing the filter by replacing the window is that if the front side of the filter is blocked by impurities, the pressure of the film forming liquid in front of the filter will increase. The liquid flows through the filter sheet, resulting in defective film; second, when there are too many impurities in front of the filter sheet, the flow rate decreases, and it is necessary to stop the machine to clean up the impurities, which not only delays normal production, reduces production efficiency, but also causes a lot of waste of raw materials; third is Reduce the service life of the filter

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