①Front unloading type: simple structure, reliable operation, good vision, suitable for various work sites, and widely used;
②Rotary type: The working device is installed on a turntable that can be rotated 360°, and the side unloading does not need to be turned around. The operation efficiency is high, but the structure is complex, the quality is large, the cost is high, and the side stability is poor. It is suitable for smaller venues.
③ Rear unloading type: front-end loading, rear-end unloading, high operation efficiency, and poor operation safety.
