| 摘要 |
<p>PROBLEM TO BE SOLVED: To miniaturize hydraulic equipment while making the structure clear, provide the excellent operability while facilitating the arrangement, and lower the cost by providing a controller for controlling an electromagnetic valve so as to control a first and a second hydraulic cylinders in order for telescopic motion. SOLUTION: The downstream of a main hydraulic pump 21a is connected to extension side oil chambers 7a, 8a and shrinkage side oil chambers 7b, 8b of a first and a second hydraulic cylinders 7, 8. Each cylinder 7, 8 is formed of a double acting hydraulic cylinder having the same structure. Each hydraulic cylinder 7, 8 is controlled for telescopic motion by each direction switching valve 23, 24, and each direction switching valve 23, 24 is driven by the pilot oil pressure through a first and a second electromagnetic valves 44, 48. Each electromagnetic valve 44, 48 is electrically controlled by a controller 55 with the simple theory. Circuit structure is thereby simplified so as to facilitate the arrangement, and an equipment can be miniaturized.</p> |
