Research and Experiment on Hot Air Cleaning Device of Combine Harvester

Abstract

The harvest season in southern rice producing areas is often rainy and wet. The rice extruded material is squeezed and rubbed by the threshing nails so that the stem's water with higher moisture content penetrates the surface of the extruded material. During the contact process, the water film is formed, and the pressure difference inside and outside the water film forms the capillary force.Due to the influence of capillary force, the extractives easily adhere to the vibrating screen and the shaking plate, which leads to problems such as the reduction of the effective working area of the cleaning device, the blockage of the screen hole, and the obstruction of the material flow, resulting in generally high impurity and loss rate of the cleaning device.Aiming at the problem of high impurity and loss rate of wet crop cleaning, a kind of cleaning fan with variable temperature was developed, so that the cleaning device could not only adjust the air temperature of the fan in real-time, but also ensure that the wind speed of the whole cleaning device was not affected, and improve the cleaning efficiency.