| 摘要 |
<p>Clamping cylinder 22 slidably receives a clamping ram 26 whose front end is fixed on a movable board 20 of (e.g.) an injection molding machine (21,23-25) and which has a chamber opening in its rear face. The interior of the clamping cylinder 22 is divided into a rear chamber W and a front chamber X by the large-diameter piston section of the clamping ram 26. From the inner rear wall of the clamping cylinder 22 there projects, a mold opening piston having a front end which slidably fits in the chamber in the clamping ram 26. The opening piston has a large-diameter piston section which divides the chamber into a rear chamber Y and a front chamber Z which communicates with the atmosphere. A hydraulic controlling device 31-37 controls the connection of the chambers X,Y and Z to each other and to an oil pressure source 40. Thus it connects the chambers X and Y to the chamber W for high-speed mold closure. It connects the chamber W to the oil pressure source 40 and relieves the pressure in the chambers X and Y for tight clamping; and it connects the chamber Y to the oil pressure source and connects the chamber W to both the chamber X and the relief means 32 for opening the mold. Preferably, the effective pressure receiving area of the chamber Y is to be equal to the cross-sectional area of the chamber section of the clamping ram 26.</p> |
