To provide a hydraulic device for a crusher including a crushing arm and a hydraulic cylinder for opening or closing the crushing arm and capable of reducing power loss when supplying pressure oil into the hydraulic cylinder and increasing opening or closing speed of an opening and closing arm to improve workability.
The opening and closing cylinders 20A, 20B include two types of head side oil chambers, namely, the first head side oil chambers 20AH1, 20BH1 and the second head side oil chambers 20AH2, 20BH2. This hydraulic device for the crusher includes an accelerating circuit 46 when extending for supplying the oil discharged from rod side oil chambers 20AR, 20BR into the first head side oil chambers when the opening and closing cylinders are extended, an accelerating circuit 45 when contracting for supplying the oil discharged from the first head side oil chambers into the rod side oil chambers when the hydraulic cylinders are contracted, and an accumulator 22 for accumulating the oil discharged from the second head side oil chambers when the hydraulic cylinders are contracted and supplying the accumulated oil into the second head side oil chambers when the hydraulic cylinders are extended.
MIYATA NAOKI
AWANO KATSUSUKE
MATOBA NOBUAKI
Suzuki Yuko
Naozumi Ono
Sachiko Okunuki
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