Sieve in adjustable aperture

The utility model provides a sieve in adjustable aperture, includes framework and wire rope, the framework includes frame, locking board and lock screw, is equipped with the draw -in groove in the frame, and the locking board is settled in the draw -in groove, is equipped with multiple hook on the locking board, and it is equipped with three through -hole to distribute at least on the side of frame, is equipped with the screw hole corresponding with the through -hole on the locking board, and lock screw's thread end passes the through -hole and installs at threaded hole, the framework has four groups, and the head and the tail of four group's frameworks interconnect in proper order constitute a square frame, and at wire rope's a both ends fixedly connected with link respectively, wire rope passes through the detachable connection of link on the couple, the utility model discloses the local back of being destroyed of screen cloth in the sieve can be changed and maintain the very convenient position to the scre