Air quantity control device of local fan

The utility model discloses an air quantity control device of a local fan, which comprises a cylindrical body (1) with a square opening at one end, a pair of guiding grooves (2) respectively fixed on the left side and the right side of the square opening and an air quantity control board (3) embedded in the guiding grooves (2). A bending wheel hold-down mechanism is arranged above the air quantity control board (3) and comprises a cross-bar (4), a spindle (5) and a bending wheel (6), the bending wheel (6) is supported on the cross-bar (4) through the spindle (5), the upper surface of the air quantity control board (3) is in outline contact with the bending wheel (6), and a sealing strip (7) is arranged between the lower surface of the air quantity control board (3) and the guiding grooves (2). The air quantity control device of the local fan is simple in structure, reasonable in design, and applicable to air quantity control local fan under a coal mine.