基于PID控制的粉末成型机下冲回弹装置设计

Resilient device of automatic powder molding machine based on PID controller

针对目前机械式全自动粉末成型压机下冲回弹装置中普遍采用的"定量供油装置"出现的抗污染能力差、回弹行程不易调节、可靠性差等问题,进行了分析研究,提出了一种采用PLC作为PID控制器,伺服比例阀作为先导阀,配合距离传感器所组成的高精度下冲定量回弹闭环控制系统。设计中计算了液压缸、伺服比例阀的传递函数,并对PID控制器进行了Matlab仿真,同时对系统进行了建模和实际调试。研究结果表明,该系统运行稳定、响应速度快、可靠性高、操作方便,能够提高产品的质量,为今后机械式粉末成型压机下冲定量回弹装置的设计和改造提供了设计依据,对于提高机械式粉末成型机的产品合格率具有一定的现实意义。

Aiming at the resilient device of the lower punch in automatic powder molding machine, poor antipollution ability, uneasy traveladjustment and poor reliability were researched, and a new closed-loop control system based on PLC as a PID controller, servo proportionalvalve as a pilot valve and a distance sensor was proposed. The transfer function of hydraulic cylinder and servo proportional valve were testedand the PID controller was simulated by Matlab. The results indicate that the system operates stably and reliably, with better real-time per-formance and has an important meaning on design of the resilient device, which can improve the quality and raise the qualified rate of prod-ucts.