HYDRAULIC CONTROL DEVICE AND WORK MACHINE EQUIPPED WITH SAME

摘要

Provided is a hydraulic control device for which it is possible to suppress the occurrence of cavitation in a regenerative motor that regenerates the energy of a hydraulic actuator and to reduce the loss of power, and an operating machine having the same. The hydraulic control device includes: a recovery oil passage (R7) for recovering, into a tank (T), hydraulic fluid derived from a hydraulic actuator (11, 12) and a hydraulic pump (16, 17); a regenerative motor (18) that rotates an output shaft (7a) of an engine (7) in response to a supply of the hydraulic fluid and is driven to rotate by rotation of the output shaft (7a) of the engine (7); a regenerative oil passage (R8) for guiding return oil from a boom cylinder (12) to the regenerative motor (18) without passing the return oil through the recovery oil passage (R7); a coupling oil passage (R9) that couples the recovery oil passage (R7) and the regenerative oil passage (R8) to each other; and a regeneration-side check valve (21) that is provided on the coupling oil passage (R9), and allows the hydraulic fluid to flow from the recovery oil passage (R7) toward the regenerative motor (18), and moreover restricts the hydraulic fluid from flowing from the regenerative motor (18) toward the recovery oil passage (R7).