| 摘要 |
An automatic control device for a boundary plate of a grain separator for separating a grain mixture into different grains. The grain separator has a separator plate provided with a roughened surface and mounted at inclinations in both of longitudinal and lateral directions with respect to the horizontal plane. A lateral movement is imparted to the different grains on the separator plate by a lateral oscillation given to the separator plate or by a lateral jet of air jetted from a numerous small aperture formed in the separator plate, so that the flow fluxes of different grains are deflected away from each other due to the difference in the physical properties such as specific weight and/or friction coefficient, so that the mixture of different grains are separated. The automatic control device comprises a photoelectric detector associated with a boundary plate and disposed in a grain transfer trough provided at the downstream end of the separator plate and having a light transmitting surface disposed substantially vertically on the wall of a grain flow sleeve mounted in the grain transfer trough so that the light transmitting surface is continuously cleaned by the grains which make sliding contact with the light transmitting surface, thereby to ensure an accurate measurement of the mixing ratio of grain mixture and, accordingly, a correct automatic adjustment of position of the boundary plate in the grain transfer trough. |
