Method and device for regulating pressure

Abstract

Abstract PURPOSE:To regulate automatically the pressure in an accumulator constant by providing a partition wall for preventing the outflow of a compressive fluid in the accumulator which regulates the oil pressure in a hydraulic tank for an injection molding machine, and connecting a pressure sensor to the accumulator. CONSTITUTION:A partition wall (piston) 42 for preventing the outflow of a compressive fluid from an accumulator 24 which regulates the oil pressure in a hydraulic tank 22 is provided to said accumulator. When the pressure in the accumulator 24 drops, a pressure sensor 54 detects the same and transfers immediately a pressure detection signal to a control circuit 56. The control circuit outputs the signal for opening a pilot operated selector valve 45 to a solenoid operated selector valve 50 to force the pressure oil in the accumulator 24 by the operation of a hydraulic pump 28 thereby restoring the normal pressure. When the pressure in the accumulator 24 increases, the control circuit outputs the signal for opening a pilot operated check valve 48 to a solenoid operated selector valve 52 to flow the pressure oil, thereby restoring the normal pressure in the accumulator 24.

Inventors

• 👤 Sadayoshi Yamada
• 👤 山田　貞好

Bibliographic Details