Filtration apparatus

A filtration apparatus for obtaining a cleaned cutting oil by filtering a filtration target cutting oil, in which cuttings and a cutting oil are mixed after said cutting oil is used by industrial machines, thereby enabling re-use of said cutting oil, said filtration apparatus comprising:

• a cutting oil tank (1) for storing said cleaned cutting oil;
• a storage tank (70) formed within said cutting oil tank for temporarily storing said filtration target cutting oil and having a charge port (8) where said filtration target cutting oil is supplied;
• a rotatably driven filtration drum (30), rotatably supported and partially submerged in said storage tank (70), and having a side-surface opening (27c) in at least one surface thereof in order to let said cleaned cutting oil flow into said oil tank, and being provided with filtering means (44) on an outer circumferential surface for filtering said filtration target cutting oil;
• said filtration drum (30) having a base (27) with a side surface (27b) where dynamic seal members (33) are provided, a shaft member (245) for rotatable supporting said drum (30) in said storage tank (70) and mounting means (249) for attaching said dynamic seal member (33), thereby dividing the oil level around said dynamic seal member into an upstream side and a downstream side, and for enabling said filtration drum (30) to be rotatable in said storage tank (70);
• injecting means (245a) for washing said filtering means (44) reversely from inner sides to outer sides of said filtration drum (30);
• and
• dip-up means (10, 11) for continuously conveying said cuttings downward from said charge port (8) to a discharge port (4).