Filter device and cleaning device for removing dirt particles from a filter element of a filter device Filter device and cleaning device for removing dirt particles from a filter element of a filter device

摘要

Filter device for separating dirt particles and impurities from a plastic melt, comprising - a housing (2) with a filter chamber (4) and an inlet for introducing plastic melt into the filter chamber and an outlet for conducting plastic melt out of the filter chamber, and a dirt outlet (6 ) for discharging dirt particles from the housing (2); A filter element (8) arranged in the filter chamber (4) through which the melt stream can be conducted and which is adapted to retain dirt particles contained in the melt stream, and a cleaning device (10) for cleaning the filter element (8) by means of Filter element retained debris containing a cleaning head (12) with at least one scraper (14, 14 ') for releasing dirt particles from the filter element (8), wherein the cleaning head (12) and the filter element (8) relative to each other movable and at least temporarily the at least one scraper body (14, 14 ') is coupled to an adjusting device (16) which is adapted to press the scraper body against the surface of the filter element (8), characterized in that the adjusting device ( 16) has at least one bellows cylinder (18, 18 ', 18' ') with - a foot part (54, 54'), which has at least one opening (66) for a fluid-conducting connection to a pressure source, - a head part (56, 56 ') which is movable along an adjustment path relative to the foot part (54, 54'), - a deformable bellows element (52, 52 '), which is sealingly connected to the foot part (54, 54') and the head part (56, 56 '), and a variable volume pressure chamber (20) which is adapted to the head part (56, 56') in Dependence of the pressure prevailing in the pressure chamber relative to the foot part (54, 54 ') to move, wherein the pressure chamber (20) is connectable to the pressure source.