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    • 9. 发明专利
    • Method and apparatus for controlling tandem extruder
    • 用于控制TANDEM挤出机的方法和装置
    • JPS595044A
    • 1984-01-11
    • JP11474582
    • 1982-07-01
    • Toshiba Mach Co Ltd
    • IGUCHI KATSUHIRONOZAWA KENJI
    • B21C31/00B29B7/00B29C47/00B29C47/50B29C47/68B29C47/92
    • B29C47/50B29C47/0023B29C47/92B29C2947/92019B29C2947/924B29C2947/92466B29C2947/92514B29C2947/92542B29C2947/926B29C2947/92885B29C2947/92952B29C2947/92961
    • PURPOSE:To unnecessitate a gear pump, by a method wherein the rotating speed of the second extruder is set to be constant, and the rotating speed of the first extruder is so controlled as to make constant the material pressure difference between the charging side and ejecting side of the second extruder, in a tandem extruder for a molten resin. CONSTITUTION:A die 22 is fitted to a tip part of the second extruder 16 through a filter 21, and a molten resin supplied from a ejecting port of the first extruder 11 through a connecting pipe 23 is extruded. The rotating speed N2 of a screw for the second extruder 16 is controlled to be constant by a loop comprised of a speed detector 19, a speed controller 20 and a driving motor 18. The pressure difference P1-P2 between the charging side and the ejecting side of the second extruder 16 is detected by pressure difference detectors 24, 25 and a comparing calculator 26, and a pressure controller 28 performs a cascading action on a screw rotating speed controlling system for the first extruder 11 which system is comprised of a speed detector 14, a controller 15 and a driving motor 13 so that the pressure difference becomes a set point 27, whereby the pressure difference P1-P2 is controlled to be constant. Accordingly, clogging of the filter can be automatically compensated for without using any gear pump.
    • 目的:为了使齿轮泵不必要,通过将第二挤出机的转速设定为恒定的方法,并且控制第一挤出机的旋转速度,使得充电侧和喷射之间的材料压力差恒定 在第二挤出机的一侧,在用于熔融树脂的串联挤出机中。 构成:通过过滤器21将模具22装配到第二挤出机16的末端部分,并且挤出通过连接管23从第一挤出机11的排出口供给的熔融树脂。 通过由速度检测器19,速度控制器20和驱动电动机18构成的回路,将第二挤出机16的螺杆的转速N2控制为恒定。充电侧与排出的压力差P1〜P2 通过压力差检测器24,25和比较计算器26检测第二挤出机16的侧面,压力控制器28对第一挤出机11的螺杆转速控制系统进行级联动作,该系统由速度检测器 14,控制器15和驱动电机13,使得压力差成为设定点27,由此将压力差P1-P2控制为恒定。 因此,可以在不使用任何齿轮泵的情况下自动补偿过滤器的堵塞。