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.
The device includes a differential circuit 55 which regenerates return oil from a rod chamber 19b of one cylinder 19 to a head chamber 19a at the elongation of the cylinders 19, 20, and a sequence valve 47 which is switched so as to feed pressurized oil to a head chamber 20a of the other cylinder 20. A second pilot check valve 48 is arranged in an oil passage which connects the head chamber 20a and a rod chamber 20b of the other cylinder 20, and a first switch valve 51 for opening the rod chamber 20b of the other cylinder 20 is arranged. There are arranged an accumulator 52 which accumulates the pressurozed oil of the head chamber 20a of the other cylinder 20 at the loosening of the cylinders 19, 20, a second switch valve 54 which controls a flow of the pressurized oil to the accumulator 52, and a third pilot check valve 49 which introduces the return oil from the head chamber 19a of one cylinder 19 to the accumulator 52.
AWANO KATSUSUKE
MATOBA NOBUAKI
Tadashi Takahashi
Takashi Watanabe
Suzuki Mitsuyoshi
Kazuya Nishi
Yasuhiko Murayama