| 摘要 |
1500796 Fluid-pressure servomotor systems PLAST-UND ELASTVERARBEITLINGSMASCHINEN-KOMBINAT KARL-MARX-STADT VEB 25 March f975 [26 March 1974] 12378/75 Heading G3P In a control system for an injection moulding machine a piston 5 is positioned according to the pressure differential in conduits 42, 43 which is determined by a nozzle-baffle system 47 having a supply pipe 41 and throttles. The piston displaces element 1, 2 or 3, 4 to connect a supply pipe 10, 11 to a work pipe 38 or 39 and the other work pipe to a drain pipe 40. In a further embodiment Fig. 2 (not shown), a pair of valve elements (1', 3') respectively connecting a work line (38') to pressure (37') and drain (40') are actuated by the opposite ends of a lever (9') which in turn is actuated by two pistons (5', 6') acting on the lever ends and positioned by a nozzle-baffle system (47'). In a still further embodiment Fig. 3 (not shown), similar to that shown a piston (5") is positioned by a control pressure on one side (27") and the working pressure on the opposite side (28'') and the valve elements (1'', 3") controls the communication between the working pressure line (Z) and the supply (D) and the exhaust (A) respectively. The control pressure is determined by pressure limiting valves (50'', 55'') and (56") each of which has a different set pressure switched into circuit by magnetically -operated directional control valves. |
