ROTATION-TYPE WORKING MACHINE

摘要

A rotation-type working machine is provided with: a hydraulic motor (11) having first and second ports (11a, 11b) and rotationally driving the upper rotation body; a hydraulic pump (10); a rotation operation device (12) including an operation member (12a); a control valve (13) for controlling the hydraulic motor (11) on the basis of an operation signal from the rotation operation device (12); first and second conduits (14, 15) connecting the control valve and the first and second ports (11a, 11b) of the hydraulic motor (11); communication switching devices (26, 27) capable of switching between the connection between a tank (T) and the conduits (14, 15) and the interruption of the connection; a rotation electric motor (30); an electricity storage device (31); and a controller (28). During rotation, the controller (28) sets the communication switching devices (26, 27) to a connected state and performs regeneration control for instructing the rotation electric motor (30) on the amount of regeneration corresponding to the amount of reduction in back pressure due to the communication switching devices (26, 27) being set to the connected state.