The lifter and the linear conveyor can form a double-layer pallet conveyor line to achieve reciprocating conveying. LP/P rodless cylinder hoist Rod cylinder hoist, lifting power driven by rodless cylinder is suitable for double layer wire, cost-effective, and the cycle time requirements are not high (lifting speed up to 300mm/s) working conditions LP/S lead screw hoist Lead screw elevator, lifting mechanism driven by servo motor is suitable for double or multi-layer wire body, the cycle time requires fast (lifting speed up to 500mm/s) working conditions