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    • 8. 发明公开
    • A pressure sensing device for injection molding machines
    • DruckmessvorrichtungfürSpritzgiessmaschinen。
    • EP0644030A2
    • 1995-03-22
    • EP94114031.1
    • 1994-09-07
    • NISSEI PLASTIC INDUSTRIAL CO., LTD.
    • Arai, Tsuyoshi, Nissei Plastic Ind.Co.,Ltd.
    • B29C45/77
    • B29C45/77B29C2045/773
    • A hydraulic pressure cylinder incorporating a double-rod type piston 3 - for example injection cylinder 2, when the hydraulic pressures of fore and rear oil chambers are respectively detected by a pair of pressure sensors 4, 5; and subsequently obtaining detected pressure value Pd from the difference between respective oil chamber pressure measurements Pdf, Pdr based on the outputs respectively from pressure sensors 4, 5, the detected pressure value Pd of period Ts during which detected pressure value Pd becomes zero theoretically, is calculated in advance, then while storing calculated detected pressure value Pd as correction value A, at the time of pressure sensing, correcting the detected pressure value Pd according to correction value A, whereby the accurate zero adjustment point may always be maintained without being influenced by a temperature drift, enabling an accurate and high-precision pressure sensing.
    • 当前后油室的液压分别由一对压力传感器4,5检测时,包括双杆式活塞3(例如注射缸2)的液压缸。 然后根据来自压力传感器4,5的各输出的各个油室压力测量值Pdf,Pdr之间的差值,从理论上检测压力值Pd变为零的期间Ts的检测压力值Pd,获得检测压力值Pd 然后在将计算出的检测压力值Pd存储为校正值A的同时,在压力检测时,根据校正值A校正检测到的压力值Pd,由此可以始终保持精确的零点调整点而不受 温度漂移,实现精确和高精度的压力感测。