Working device with stationary mast and rotary head

Abstract

A working device has a base designed as a stationary support column, a motor-driven rotary head and a stack of arms made up of several mast arms which can be moved with respect to each other in pairs, using articulated or sliding joints, supporting a concrete transport line. The stack of arms is articulated on the rotary head about a horizontal rotational axis by a first mast arm. The working device also includes a control mechanism which can be actuated by a control element or a radio path and which is arranged in a control box, and a hydraulic assembly including an oil tank and a motor-driven hydraulic pump for controlling working groups for moving the rotary head and mast arm. A working platform fixed with respect to the frame is arranged in the region of the bearing block for emergency operations. In order to ensure that the components required for actuating the stack of arms are not in the way of the engine in the event of an emergency operation, the oil tank of the hydraulic assembly is arranged on the rotary head and includes a contour which is geometrically adapted to the rotary head, defining a window opening for the passage of a ballast boom which is detachably arranged on the rotary head. The oil tank also includes a holder for receiving the control cabinet which can pivot about at least 90° with respect to the window opening about an axis parallel to the rotational axis of the rotary head.