Screw pressing type filtering apparatus
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United States of America Patent
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N/A
Issued Date -
Jan 1, 2004
app pub date -
Jun 28, 2002
filing date -
Jan 10, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A screw pressing type filtering apparatus that discharges a treated substance having a constant water content, including a screw rotatably provided inside a substantially cylindrical filter body so that a substance supplied to the space between the screw and the filter body is filtered by the filter body while being conveyed by the rotating screw. The apparatus further includes: a back pressure valve installed in the discharge port of the filter body to restrict the discharge amount of the filtered substance, an air cylinder that supplies a pressure to the back pressure valve, a valve opening detector which detects the opening amount of the back pressure valve relative to the discharge port, and a control section which controls the air cylinder based upon the detection results of the valve opening detector so that a pressure that corresponds to the degree of opening is supplied to the back pressure valve.
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