The invention discloses an
impurity removing device and method for separating and extracting corncobs through
water pressure. The
impurity removing device comprises an
impurity removing tank, a partition plate, a
bucket elevator and a
liquid level sensor. The partition plate is arranged in the impurity removing tank, a material inlet area is formed between one side of the partition plate and the impurity removing tank, and a material outlet area is formed between the other side of the partition plate and the impurity removing tank. The
bucket elevator is arranged on the outer side of the impurity removing tank. A feeding port of the
bucket elevator is connected with a first discharging port of the material outlet area, and the
liquid level sensor is arranged in the impurity removing tank. Material liquid composed of corns, the corncobs and water is discharged into the material inlet area of the impurity removing tank along the partition plate, the corns and the corncobs mutually move and are separated under the action of the
water pressure, the corns are gathered at the bottom of the impurity removing tank, and the corncobs float on the
water level of the material outlet area and enter the feeding port of the bucket
elevator. The impurity removing device and method solve the problem that the corncobs cannot be independently extracted through a grain impurity removing
machine; and meanwhile, environment
pollution is reduced, the mechanical degree is improved, the work environment is improved, and a foundation is laid for maximization of grain machines.