【摘要】 本文对茶叶烘干机的计算机控制技术与设备进行了系统的研究。在控制模型,信号检测、采样程序、执行机构等方面均取得了预期结果,特别是出叶叶温与含水率相关性的发现与研究,为整个系统实现以叶温反馈为基础的品质闭环控制提供了科学依据和控制方法,在6CH-20A型茶叶烘干机上实现了自动控制的目的。系统具有模型控制,风温反馈和叶温反馈的功能,能适应风温及含水率的变化而自动调整烘干时间。由于实时控制和调整,产品干燥均匀适度,使茶叶品质比大生产提高一个等。计算机控制下的干燥强度达到配套烘干机原设计水平,自控系统性能稳定,可靠,抗干扰力强,易于操作维修,适于大中型茶厂应用。更多还原

【Abstract】 A computer control system of tea dryer has been, investigated during 1985-1987 for stabilization and improvement of tea quality fitted to large or middle scale tea factories.1. The computer system has three functions: model control, hot air feedback control and leaf temperature feedback control. With model control, computer system automatically determines the drying duration according to the moisture content of the material being dried. At the same time, hot air feedback function makes regulation of the drying duration while the hot air temperature is being changed. The computer system is also able to judge the drying degree according to the information of the leaf temperature at the outlet of dryer with leaf temp-erature feedback function.2. Tea quality made by this system is relatively good and stable. This brings a big benefit for tea manufacturer.3. The computer system is quite cheap, easy to assemble and operate. The total cost is about 7% of that of the dryer itself.更多还原