| 摘要 |
PURPOSE:To simplify the structure, maintenance and management of a liquid pressure circuit and make injection - compression molding easy by providing a liquid pressure generating means, a pressure accumulating means and a liquid pressure actuating means, changing the liquid pressure applied to a liquid chamber at the rear of a clamping ram into the first pressure and the second pressure and controlling the same. CONSTITUTION:After hydraulic pressure applied to a second oil chamber 62, a liquid chamber at the rear of a clamping ram 28, is generated in a first oil chamber 60 where its capacity is reduced in accordance with the forward motion of the clamping ram 28, a liquid pump for exclusive use and other drive units are not required and the structure, maintenance and management of a hydraulic circuit is simplified. Also, as a work pressure control means consisting of electromagnetic directional control valves 112 and 116, a pressure reducing valve 114 and a variable relief valve 118 is installed between an accumulator 98 and the second oil chamber 62, hydraulic pressure applied from the accumulator 98 to the second oil chamber 62 through oil passages 108 and 110 can be switched over to the first and second pressures corresponding to the high pressure clamping force and low pressure clamping in injection - compression molding respectively.
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