Backwashing suction device for fabric filtration apparatus

A backwashing suction device for a fabric filtration apparatus, the backwashing suction device comprising:

• a suction body formed in a container shape and having a drain hole through which contents inside the suction body are discharged to the outside;
• and
• a suction plate mounted on the suction body so that an inlet portion of the suction body is closeable and having at least one main slit and at least one sub-slit to perform backwashing,
• wherein the main slit forms a slope so that an inner surface of an edge through which pile threads (F) introduced into the main slit exit is gradually widened in an inward direction from an inlet of the main slit, and
• a plurality of friction protrusions are formed to protrude from the slope, and as a fiber disk filter (D) rotates while being backwashed, the pile threads (F) are repeatedly pressed against and separated from the friction protrusions.