The loose-soil appliance has a changeover device with the function of breaking and turning loose. It can be divided into excavator and bulldozer, excavator is also called bucket hook, bulldozer is also called tail hook, generally is a single tooth, also has two teeth or three teeth, digging cutting force is strong. An integral cast loose earth tooth, with earholes in the upper part, is hinged with the bucket rod and bucket cylinder respectively, and the tooth tip has a hard alloy surfacing cap at the front end. When the piston rod of the hydraulic cylinder is extended, the tooth tip is forced to insert and turn the soil. It's used to dig up cracked rock, break up frozen ground, and also to dig up asphalt pavements. It is suitable for comminding and splitting hard earth, sub-hard rock and wind fossil, so as to facilitate excavation and loading with dipper.