| 摘要 |
PROBLEM TO BE SOLVED: To increase the flow rate of hydraulic oil by lessening pressure loss of a pipe for a hydraulic actuator of a working attachment when switching from a long boom mode to a short boom mode. SOLUTION: When a dismantling machine with a multistage type and stretchable type boom 3 is changed from a long boom mode with a four stages to a short boom mode with a three stages, a cylinder pipe 30 for a fourth boom cylinder is connected with a cylinder pipe 31 for a clamp opening and shutting cylinder 16 for opening and shutting a clamp of a crushing machine by a connecting block 32. Oil is supplied to the clamp opening and shutting cylinder 16 by means of hydraulic pipes of two systems, and oil fed back from the cylinder 16 is returned to a tank T. COPYRIGHT: (C)2004,JPO
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