To provide a hydraulic drive device of a dismantling working machine that can increase the opening and closing speed of a crushing machine by a small flow rate.
A first switch valve 47 is arranged, pressurized oil is fed to a rod chamber of the other cylinder 20 at an opening operation, part of return oil from a head chamber of the other cylinder is fed to a rod chamber of one cylinder 19, the remaining return oil is merged with return oil from a head chamber of one cylinder, and the merged oil is released to a tank 32. A second switch valve 48 is arranged, pressurized oil is fed to the head chamber of one cylinder at a closing operation in an unloaded state, and return oil from a rod chamber of one cylinder is regenerated to the head chamber of the other cylinder. Furthermore, when a load is applied, the pressurized oil is fed to each of a pair of cylinders, and the return oil from each rod chamber of a pair of the cylinders is released to the tank. A pilot check valve 49 is arranged, and the return oil from the rod chamber of the other cylinder is regenerated to the head chamber of the other cylinder at the closing operation in the unloaded state.
AWANO KATSUSUKE
MATOBA NOBUAKI
Tadashi Takahashi
Takashi Watanabe
Suzuki Mitsuyoshi
Kazuya Nishi
Yasuhiko Murayama
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