SCRAPER APPARATUS FOR CLEANING ROTARY KILNS
The cylindrical cage (20) has openings, through which the substance to be treated can be moved in the axial and the radial direction. The cage (20) has a support frame (11). A large number of scratching members (10) extend in the axial direction of the rotary furnace (1) and are in each case arranged at a distance from one another on the outer circumference of the support frame (11). The cage diameter is smaller than the internal diameter of the rotary furnace. At least one scratching member (10) touches the inside of the rotary furnace so that the cage rotates freely together with the rotary furnace (1). The cage (20) has bolts (12). A piston rod (13) of a fluid cylinder (14) can be displaced into contact with the bolts (12) in order to stop the rotation of the cage (20) at intervals. Residues adhering to the inner wall can consequently be removed without the rotary furnace having to be taken out of operation for a relatively long time. <IMAGE>