【作者】 罗辑；

【导师】 张世伟；

【作者基本信息】 东北大学 ， 化工过程机械， 2008， 硕士

【摘要】 随着社会的发展,控制检测技术变得越来越重要,好的控制检测方法能够带给我们极大的方便,节省我们大量的时间,同时也能够完成一些人们用人工很难完成的问题。现代社会随着医药食品卫生行业的发展,真空冷冻干燥设备已经成为这些行业或者科研单位的必须设备。相对于医疗食品企业使用的大中型冻干设备而言,小型试验用台式冻干机在市场中更为普遍,它具有体积小成本低,试验方便快捷,运行费用低等优点。但是相对于大型机而言,它的控制检测功能更为薄弱,主要是其不能够跟计算机直接连接,不方便对数据进行后期的分析和处理。本文针对此不足之处,对其控制检测方法进行研究。温度和真空度数据是真空冷冻干燥过程中至关重要的数据。不同的温度和压力状态组合下,对于产品冷冻干燥后的质量和其特性有着不可分离的原因,本课题的研究目的在于实现真空冷冻干燥过程中采用低成本的解决方案对温度压力及质量进行采集,从而方便其试验后对数据的分析,为以后提高冷冻干燥后的产品质量进行有效的研究。针对冻干机控制系统现存问题以及冷冻干燥实验研究的需要,本文利用试验室设备,开发适用于小型冻干机的计算机控制系统。系统硬件部分主要由PC机和下位单片机构成,由软件部分采用Visual Basic语言在Windows环境下开发了可视化控制程序。要求系统实现了数据采集、存储自动化,能够选择数据采集周期,绘制冻干曲线,记录加热输出功率变化情况。本文运用现有的理论技术,解决了实验室用冻干机功能无法满足实际使用要求的问题,为冻干工艺及理论的研究创造了实验条件,同时还为大型冻干机控制系统研制积累了经验。更多还原

【Abstract】 With the development of society, control detection technology becoming more and more important, good control detection method can bring us great convenience and save us a lot of time, but also able to complete a lot of problem for people very difficult.With the development of food industry and modern medicine community, vacuum freeze-drying equipment has become the industry or scientific research units, the equipment must be. Comparing with the medical use of the large and medium-sized food enterprises freeze-drying equipment, small-scale desktop freeze-drying equipment in the market more generally, it has a small low-cost, convenient and quick test, the advantages of low operational costs. In contrast to the huge freeze-drying equipment, for its part, the control of detection more weak, they can not connect to the computer directly, it is not convenient for the data analysis and processing.In this paper, we do some research on the weak aspects of small-scale desktop freeze-drying equipment.Temperature and atmospheric pressure are the critical data of vacuum freeze-drying process. Different combinations of temperature and pressure on the state, after the freeze-dried products and the quality of its properties have an different property, the purpose of this paper is getting important data in a vacuum freeze-drying process and after that it is easy for us to analysis data, in the future we can have a effective research on freeze-drying products.Consider of the existing problems of freeze-drying control system, as well as the need of freeze-drying experiment, we develop a small control system for small freeze-drying equipment. One part of the System is PC, the other part is microcontroller, in PC we use Visual Basic language to code a small system in the Windows environment. System require the data collection, storage, automation, data acquisition can choose cycle of freeze-dried drawing, recording changes in the heating power outputIn this paper, we use of the existing theory, to solve the problems that does not meet the requirements of practical use for freeze-drying process and created the theory of experimental conditions, and also get experiences for control system for large-scale development of freeze-drying equipment.更多还原