| 摘要 |
PURPOSE:To prevent pressure shock from developing and consequently contrive to stabilize the controlling of a molder and to prevent from defective product from generating by providing a joining circuit, which is formed by connecting discharge sides of a plurality of proportional electromagnetic pressure and flow rate controlling variable pumps with each other through non-return valves, and a controller to give control signals, which allot the discharge rates of respective pumps at a certain fixed ratio, to the respective pumps. CONSTITUTION:The discharge rates and pressures of respective pumps 4 and 5 are controlled by changing the tilting angle of a swash plate with control signals sent from a controller 3. The discharge ports of the pumps 4 and 5 are respectively connected to non-return valves 6 and 7. The efflux sides of the non-return valves 6 and 7 are joined and, after that, connected to various actuators 8. The controller 3 computes discharge rates necessary for maintaining the speeds and pressures set by setters 15 and allots the discharge rate to a certain fixed ratio in accordance with the number and capacities of the pumps. Thus, the discharge rates in a joining circuit 2 can be controlled only by electrical control signals issued from the controller 3.
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