Left-handed low-noise ball nut capable of discharging dust

The left-handed low-noise ball nut capable of discharging dust comprises a ball nut body and a fixing block, a groove is formed in the inner wall of the ball nut body, a dust removal mechanism is rotatably installed in the groove and comprises a hollow plate, one end of the hollow plate is connected with a second brush plate, and the other end of the hollow plate is connected with a third brush plate. A hollow plate is arranged on the outer wall of the ball nut body, two sets of first brush plates are connected to the corner cut position of the hollow plate, dust brushed by the first brush plates and second brush plates falls into the hollow plate, a dust outlet is formed in the bottom of the hollow plate, and two sets of semi-circular sleeve pieces are arranged on the outer wall of the ball nut body in a sleeving mode through bolts. In the moving process of the ball nut, dust attached to the interior of the ball nut can be automatically cleaned, the dust cleaning difficulty is lowered, contact between balls