[目的]提高烘茧质量、降低烘茧成本.[方法]采用可编程序控制器(PLC)对热风循环烘茧机进行改造,并对PLC控制系统的设计、梯形图、程序编制等进行了简要介绍.[结果]实现了蚕茧烘干工艺流程的自动化控制.与传统的电器控制和单片机控制相比,PLC烘茧机自动控制系统具有稳定、可靠、设备简单、成本低等优点.实际应用结果表明,PLC控制系统的温度波动范围＜±1 ℃,蚕茧品质在干燥过程中得到了很大程度的提高,且可节约劳动力成本33.3%以上.[结论]PLC控制系统适合各种型号的热风循环烘茧机自动控制,具有明显的经济效益.%[Objective] The study was to increase the quality and decrease the cost of cocoon drying. [Method] The hot air cocoon drying machine was reformed with PLC, and the design, ladder diagram and programming of PLC control system was briefly introduced. [Result] The automatic control of cocoon drying process was implemented. Compared with traditional electrical control and scm control, PLC automatic control system of cocoon drying machine had the advantages of stable, reliable with simple device and low cost. The practical application results showed that the fluctuation range of the temperature of PLC control system was lower than ±1 ℃, and the quality of cocoon was greatly increased in drying process, and the cost of labor was economized more than 33.3%. [Conclusion] PLC control system was suitable for various type of hot air cocoon drying machine for automatic control with obvious economic benefit.
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