| 摘要 |
<p>PROBLEM TO BE SOLVED: To securely confirm that a rod of a cylinder does not go back without attaching a position detecting sensor to the cylinder moving ahead or back a pressure pin. SOLUTION: A device connects a pressure chamber 13 of a booster 9 with a cap side chamber 4 of the cylinder 1 by means of a first flow passage 15, provides the position detected sensor 14 detecting position of a booster piston 11 and provides a directional valve 18 including first position Y in which a second flow passage 16 connecting to a cylinder chamber 12 of the booster 9 is in switched fluid communication with hydraulic oil source P and at the same time in which a third flow passage 17 connecting to a head side chamber 5 of the cylinder 1 is in switched fluid communication with an oil tank T and second position Z in which the second flow passage 16 is in switched fluid communication with the oil tank T and at the same time in which the third flow passage 17 is in switched fluid communication with the hydraulic oil source P. Therefore, the booster piston 11 moves whereby the rod 2 goes back and accordingly, the device can confirm whether the rod 2 goes back or not by detecting the position of the moved booster piston 11 by the position detected sensor 14 and makes it possible not to require the position detected sensor to the cylinder of disposition under environment of high temperature.</p> |
