Thickening treatment of key parts of the board and increasing the cross-section of the boom box to improve bending and torsion resistance, increasing the service life by more than 20%. The front end and root of the stick are both equipped with a middle lubrication structure to improve reliability. Enhanced joystick with new T-shaped sleeve bearings to improve wear resistance. The 1.3m ³ reinforced bucket greatly improves the efficiency of excavation and loading.