| 摘要 |
<p>A flow adjusting valve of the spool type having a flow inlet and a flow outlet incorporated in a die casting machine comprising an injection cylinder for activating a plunger by a pressurized oil, a pressurized oil source, a single hydraulic passage through which the oil is supplied from the oil source to the cylinder, so that the single passage includes the valve therein in such arrangement that upstream and downstream portions of the single passage communicate with the flow inlet and the flow outlet, respectively, whereby the injection operation is switched from low speed injection to high speed injection. The valve comprises a valve body having the above flow inlet and outlet and a valve bore being formed with or without a cylindrical sleeve having at least a radial hole, so that the valve bore communicates with the flow inlet and the flow outlet; a valve spool comprised of a cylindrical rod axially slidably mounted in a tight manner in the valve bore for closing and opening the flow outlet by axial forward and rearward movement thereof relative to the valve body; a screw mechanism, preferably a ball screw mechanism, provided at the rear end of the valve body for transforming rotational movement into axial movement; and a motor capable of controlling the amount of rotation, preferably a pulse motor, provided for driving the valve spool via the screw mechanism, so that the valve spool is forced to move in the axial direction relative to the valve body.</p> |
