| 摘要 |
PURPOSE:To make an apparatus small-sized, and simplified and easily adaptable to the higher specification of the injection rate and the plasticating capacity, by providing a logic valve that takes a small space and allows a large volume to be passed. CONSTITUTION:When the plasticizing is carried out, to fill a space that is formed in a chamber 13, a large amount of a hydraulic oil is sucked from a tank 14 via an opening 16 and a chamber 17 of a logic valve 15 and a passage 18. Then when the injection is carried out, the large amount of the hydraulic oil in the chamber 13 is returned via the chamber 17 and the opening 16 of the logic valve 15 and the passage 18 to the tank 14. Then when the suck-back operation is carried out, since the electromagnetic change-over valve 21 is magnetized, the pressure oil from the hydraulic pump 23 pushes up a poppet 25 to close the opening 16 and at the same time reaches the passage 18 via a check valve 28, and since the opening 16 is closed, all the pressure oil is fed to the chamber 13. |
