To improve work efficiency by accelerating opening and closing of a crushing arm, and to reduce power loss upon supplying and discharging oil to a hydraulic cylinder, in a crusher provided with the crushing arm and the hydraulic cylinder opening and closing the crushing arm.
Piston rods 34 of opening/closing cylinders 20A, 20B are made hollow, and accumulators 35 are housed in hollow parts 34a of the piston rods 34, respectively. During the opening operation of the crushing arms 19A, 19B, the oil discharged from head-side oil chambers 20AH, 20BH is accumulated in the accumulators 35, and during the closing operation in a low-load state having no contact with an object to be crushed, the pressure oil accumulated in the accumulator 35 is supplied to the head-side oil chambers 20AH, 20BH.
AWANO KATSUSUKE
MATOBA NOBUAKI
Suzuki Yuko
Naozumi Ono
Sachiko Okunuki