Abstract: A rake conveyor comprises a horizontal movable part and a rotating-swinging part and/or an inclined part. A screen is located above part of the rake conveyor. The rotating-swinging part and/or the inclined part of the rake conveyor is followed by a first bucket conveyor or the a part of the dual bucket conveyor, which lifts the used loose material into equipment for sorting of loose material. At least one of the outputs of equipment for sorting of loose materials is followed by a second bucket conveyor or by a second part of the dual bucket conveyor. The outlet of the second bucket conveyor or the second outlet of the dual bucket conveyor leads to a silo, which is additionally equipped with an outlet mouth, leading into a container. Once used abrasive material has accumulated, the excess abrasive material is taken out of the container above the rack conveyor.

Abstract: A drive unit has an output subject to changing loads, where the drive unit consists of fixed and moving parts connected to a power source. The output of the drive unit is controlled in cycles, and for ascertaining the load in a given cycle, the time period required for changing the position of the moving part of the drive unit, or for changing the position of the moving part of the equipment in mechanical contact with the moving part of the drive unit, from one predefined position to another predefined position is measured, whereby the input required in the next cycle is determined according to the time period ascertained in at least one preceding cycle. Where the drive unit is an electric motor, the input required in given cycle is also determined according to electric resistance of the electric motor ascertained in at least one preceding cycle.

Abstract: A rake conveyor comprises a horizontal movable part and a rotating-swinging part and/or an inclined part. A screen is located above part of the rake conveyor. The rotating-swinging part and/or the inclined part of the rake conveyor is followed by a first bucket conveyor or the a part of the dual bucket conveyor, which lifts the used loose material into equipment for sorting of loose material. At least one of the outputs of equipment for sorting of loose materials is followed by a second bucket conveyor or by a second part of the dual bucket conveyor. The outlet of the second bucket conveyor or the second outlet of the dual bucket conveyor leads to a silo, which is additionally equipped with an outlet mouth, leading into a container. Once used abrasive material has accumulated, the excess abrasive material is taken out of the container above the rack conveyor.