The fixed crushing arm is mainly used for secondary crushing of large ore at the ground site or at the grid screen at the wellhead of underground sliding in metallurgy, mining, chemical and other industries for transportation and lifting. The fixed crushing working arm is self-developed according to the actual working conditions of the crushing site. It adopts international advanced technology and imported hydraulic hammer— Pneumatic control, large crushing capacity, stable operation, low noise, reliable performance and convenient operation. The fixed crushing arm can operate continuously on the site under any complex working conditions, reduce the labor intensity of workers, improve the on-site working environment and improve work efficiency. The fixed crushing arm is an ideal equipment for secondary crushing mechanization. Main application scope of fixed crushing arm: 1. Open pit mine Material blocking treatment at the grid screen at the material inlet of the dressing yard (tiger mouth); 2. Underground mine Blocking treatment of chute machine, underground ore transfer station, loading yard, ore drawing mouth and feeding mouth; 3. Ore yard Treatment of blockage at the inlet of crusher in ore yard; 4. Smelter All kinds of mobile ladle shelling, brick removal and ladle removal; 5. Metallurgy Special shelling, brick dismantling and slag cleaning treatment for various metallurgical furnaces; 6. Loading and unloading station Handling of large block blocking in ore terminal loading and unloading station;