Determination of the parameters of the dynamic braking roller of the gravity pallet rack

The use of a block storage system and optimization of picking routes in warehouses reduces the costs of basic logistics operations. Equipping warehouses with racks with a gravity roller conveyor ensures a more compact arrangement of products in comparison with other types of racks, reduces the routes of pickers and automated lifting equipment. For the safe operation of the gravity roller rack, it is necessary to use brake roll-ers that limit the speed of the pallet within acceptable limits and prevent damage to the rack or cargo from excessive dynamic loads. The paper considers the devel-oped design of a dynamic braking roller, in the shell of which, through a multiplier, the engine perceives the driving torque driven by the weight of the pallet and generates a balancing electromagnetic braking torque. A technique has been developed and an expression has been obtained for selecting an engine based on its mechanical characteristics, satisfying the conditions of safe operation of the rack and taking into account the design limitations of the gravity conveyor. Experimental studies have been carried out to determine the electrical parameters of the engine necessary for the analysis of the mathematical model of the movement of the pallet on the gravity rack. The calculated and experimentally obtained dependences of pallet velocity on its mass are compared. Ranges of multiplier gear ratios, additional resistances, and slope of the web of a gravity roller conveyor are proposed for the most efficient operation of a rack with pallets weighing from 250 to 1.500 kg.