快速着水润麦控制系统研究

发布时间：2018-09-04 06:45

【摘要】：我国是面粉生产大国,随着人民生活水平的不断提高,消费者对面粉质量及精度的要求也越来越高。润麦是面粉加工的一个重要工序,对生产的面粉等级起着重要的作用。目前,润麦过程中存在着在线水分检测困难、检测精度低以及润麦时间长等难题。本课题选择MS-S-2001微波水分传感器,实现粮食水分的在线精确检测,采用真空润麦技术大大缩短润麦时间,设计了以STM32为控制核心的快速着水润麦控制系统。本课题主要做了如下几个方面的工作:1.以国标加热水分减量法做比对,对MS-S-2001传感器进行粮食水分检测的精确标定,为粮食水分的在线检测奠定基础。2.搭建系统硬件实验平台。选择STM32F103VET6作为主控芯片,通过MS-S-2001传感器获取润麦前粮食水分含量,通过STM32内置的D/A模块控制加水电磁阀的开度。根据润麦前粮食流量和当前的水分值,实时调整加水量,达到期望的水分值。STM32采集HM22真空传感器的数据,与键盘设定的真空度值比较,根据比较结果控制真空泵的开启和关闭,实现润麦过程真空值的自动控制。通过TFT显示屏显示润麦工艺中的粮食水分含量值和润麦仓的真空度值。3.将?C/OS-II实时嵌入式系统移植到STM32处理器平台,将其作为控制单元的操作系统平台对任务进行管理与调度,设计实现了着水润麦系统的实时控制,子程序包括水分检测驱动程序、真空驱动程序、液晶驱动程序、调节阀驱动程序、按键驱动程序。在搭建硬软件平台的基础上,进行了系统实验验证。实验结果表明该系统性能较好,运行稳定可靠,实现了动态水分检测精度0.2%以内;同时,通过对真空度的控制可使润麦调质处理时间从20h以上缩短至4~9h,解决了当前润麦时间长的难点,并且为真空浸渍新技术在制粉企业的应用提供了技术支撑。
[Abstract]:Our country is a big country of flour production. With the improvement of people's living standard, consumers' demands on flour quality and precision are more and more high. Moistening wheat is an important process of flour processing, which plays an important role in flour grade. At present, there are some problems in the process of moistening wheat, such as the difficulty of on-line moisture detection, the low precision and the long time of moistening wheat. In this paper, MS-S-2001 microwave moisture sensor is selected to realize the on-line accurate detection of grain moisture. The vacuum moisturizing technology is adopted to greatly shorten the time of moistening wheat, and a rapid water moistening control system with STM32 as the control core is designed. This subject mainly does the following several aspects of work: 1. Compared with the national standard heating moisture reduction method, the precision calibration of MS-S-2001 sensor for grain moisture detection was carried out, which laid a foundation for on-line detection of grain moisture. Build the hardware experiment platform of the system. STM32F103VET6 was selected as the main control chip, the moisture content of grain was obtained by MS-S-2001 sensor, and the opening degree of the solenoid valve was controlled by STM32's built-in D / A module. According to the grain flow rate and the current water value, the amount of water is adjusted in real time to achieve the expected moisture value. STM32 collects the data of the HM22 vacuum sensor, compares with the vacuum value set by the keyboard, and controls the opening and closing of the vacuum pump according to the comparison results. Realize the automatic control of vacuum value in the process of moistening wheat. The moisture content of grain and the vacuum value of the silo were displayed by TFT display screen. The C / OS-II real-time embedded system is transplanted to the STM32 processor platform, which is used as the operating system platform of the control unit to manage and schedule the task. The real-time control of the water moisturizing wheat system is designed and realized. The subprogram includes the water detection driver. Vacuum driver, LCD driver, regulator driver, key driver. Based on the hardware and software platform, the system is verified by experiments. The experimental results show that the system has good performance, stable and reliable operation, and the dynamic moisture detection accuracy is less than 0.2%. Through the control of vacuum degree, the processing time of moistening and tempering can be shortened from more than 20h to 4g / 9h, which solves the difficulty of long time of moistening wheat at present, and provides technical support for the application of new technology of vacuum impregnation in pulverized enterprises.
【学位授予单位】：河南工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TP273

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