To provide a crushing machine which comprises a pair of crushing arms and a pair of hydraulic cylinders connected to the crushing arms so as to open and close the crushing arms, respectively, which enhances workability by increasing an opening/closing speed of the crushing arm, and which reduces a power loss when oil is supplied to/discharged from the hydraulic cylinder.
The pair of crushing arms 19A and 19B is connected together via a synchronization mechanism 24 so as to be synchronously opened/closed; hydraulic circuits of the first and second hydraulic cylinders 20A and 20B are provided with a cylinder drive switching circuit which switches between the one-cylinder driving state of supplying the discharged oil of the hydraulic pump 30 only to the first hydraulic cylinder 20A and the both-cylinders driving state of supplying it to both the first and second hydraulic cylinders 20A and 20B. The one-cylinder driving state is brought about in the opening operations of the crushing arms 19A and 19B and in the closing operation in a low-load state; and the both-cylinders driving state is brought about in the closing operation in a high-load state.
AWANO KATSUSUKE
MATOBA NOBUAKI
Suzuki Yuko
Naozumi Ono
Sachiko Okunuki