Structure for adjusting inner diameter of overflow pipe of hydrocyclone

The utility model provides an overflow pipe inner diameter adjusting structure of a hydrocyclone, an overflow pipe inner diameter adjusting mechanism is arranged at an inlet of the lower portion of an overflow pipe of the hydrocyclone, the overflow pipe inner diameter adjusting mechanism comprises a fixing frame, a limiting cover plate, a rotating frame and a plurality of blades, and the blades are all installed between the fixing frame and the rotating frame. Each blade is an arc-shaped blade, one end of each blade is hinged to a pin hole of the fixing frame, the other end of each blade is in pin connection with an adjusting hole of the rotating frame, pin connection points between the blades and the rotating frame can slide along the adjusting holes, a through hole with the adjustable size is formed in the middle of the multiple blades, and the blades cover an overflowing area outside the through hole. Therefore, the inner diameter of the overflow pipe can be manually adjusted so as to change the ratio of t