Active arm broad frame base apparatus of digging machine

The utility model relates to an active arm broad frame base device of a digging machine, which solves the problems existing in the movable arm of the original digging machine, such as weak strength, and poor sealing of spherical steel plates in the movable arms. A saddle is fixedly arranged on the upper surface of a frame in a metal box shape, an axle hole is bored in the middle of the saddle, and an axle cap is connected and fixedly installed on the saddle by a screw bolt and the axle hole. The frame in a metal box shape is U-shaped at the head end and Y-shaped at the tail end, and pedals are orderly arranged between the saddle and the head end at intervals. Pedals are orderly arranged between the saddle and the tail end at intervals. A circular hole is bored in the middle of the frame in a metal box shape, a movable arm axle hole is bored concentrically in two Y-shaped sides at the tail end, and a head sheave axle hole is bored at the head end. The utility model has the advantages of reasonable design, easy manufacture, light weight, strong strength, low manufacturing cost, low operation cost and convenient maintenance.