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原设计的挤压膨化试验台，其挤压膨化机主电机调速系统与喂料调速电机控制系统各自独立，需手控协调。本文以膨化机主电机线电流的变化为信号，经取样，隔离、传输、转换成直流电压信号，并将其叠加到喂料电磁调速电机的控制器上，建立起一个附加的开环自控装置，它与原喂料电磁调速电机控制器闭环系统共同作用下，使喂料量随膨化机主电机线电流的增减而反向变化，并在一定速度上保持动态平衡
The original design of extrusion test stand, the extrusion machine main motor speed control system and feed speed motor control system are independent, requiring manual coordination. In this paper, the change of the main motor line current of the extruder as a signal, the sample, isolation, transmission, converted into DC voltage signal, and superimposed on the feed electromagnetic speed motor controller to establish an additional open-loop control Device, which with the original feed electromagnetic speed motor controller closed-loop system, the amount of feed with the expansion of the main motor line current changes in the reverse change, and maintain a certain speed dynamic balance