Patent ID: 7938272
Filing Date: 2011-05-10
Classification: B07B

Abstract:
1. A method for controlling a screening machine comprising a vibrating screen having at least one screen surface, said vibrating screen conveying material from a first end towards a second end, feeding means comprising a conveyor that feeds material to be screened towards the screen surface and at a fixed location in the first end onto the screen surface where the material is separated into a first fraction remaining on the screen surface and into a second fraction passed through the screen surface while the material is moving along the screen surface towards the second end, the method comprising: determining the amount of material on the screen surface by automatic measurement; and controlling the amount of material on the screen surface by adjusting the conveying speed of the conveyor on the basis of the measurement by automatic control in such a manner that the conveying speed, which is above zero, is changed to a different conveying speed, which is above zero, in both of the following ways: