FIELD: wood-processing industry. SUBSTANCE: device has a product line of irregular shape. An acoustic board with an acoustic sensor is installed in one of the walls. The acoustic board is made of the material for which the spectra of the acoustic signals of the materials to be separated are different. The acoustic sensor is connected with an electronic unit with which the positioning mechanism of turn screen is also connected. The screen is located in the lower part of the product line made of two branch pipes. EFFECT: simpler design of the device exercising dry cleaning of the wood chips. 2 cl, 1 dwg
