| 摘要 |
PROBLEM TO BE SOLVED: To supply oil simply by installing a relector valve operated by the pilot pressure of an oil passage for controlling the operation of a prefill valve in an oil passage communicating with a oil pressure source and a mold clamping cylinder, and branching an oil passage communicating with an overhead tank from the controlling oil passage. SOLUTION: A mold clamping hydraulic circuit having an overhead tank 13 fitted to a mold clamping cylinder 11 is used. An oil passage for controlling the operation of a prefill valve 14 which makes an oil pressure source communicate with the valve 14 and an oil passage which makes the oil pressure source with the cylinder 11 are installed. In addition, a cnange-over valve operated by the pilot pressure of the controlling oil passage is installed in the oil passage which makes the oil pressure source communicate with the cylinder 11, and an oil passage 27 for communicating with the overhead tank 13 is branched from the controlling oil passage. In this way, oil can be supplied directly from a hydraulic pump 18 to the overhead tank 13 to that work can be simplified.
|
