The roadway type stacker adopts the fork expansion mechanism to make the fork telescopic, so that the width of the roadway can be narrowed and the utilization rate of the warehouse can be increased. The tunnel type stacker applies to the high-rise shelf warehouse of various heights, which can realize semi-automatic, automatic and remote centralized control.

According to the characteristics of the structure, the tunnel type stacker can be divided into single column tunnel stacker and double column tunnel stacker. The single column tunnel stacker is composed of a column, upper beam and lower beam. The structure stiffness is small, and it is suitable for the occasions where the height is not high and the weight is not large. The double-column roadway stacker is supported by two columns on the left and right, and has good stiffness, which is suitable for any height and stacking heavy occasions, and is suitable for high-speed operation.