基于单片机控制自动配料系统大学生毕业论文（设计）（设计）.doc

毕业设计论文 基于单片机控制自动配料系统 摘 要 皮带配料系统是一种连续累计自动，广泛用在煤炭、化工、冶金、建材、食品等关系国计民生的各个行业，可对物料的配比实现累计量控制，而准确的累计量控制可提高产品质量，降低生产成本，提高劳动效率。 首先介绍了控制器的国内外发展状况，接着对的组成结构、工作原理作了介绍。然后根据流量控制的设计要求，设计了以AT单片机为主控芯片的控制器。 ABSTRACT Belt batching system is a continuous totalizing automatic weighing instrument. It has played a critical role in coal, chemical industry, metallurgy, building materials, food and other sectors that are crucial to national economy and peoples livelihood. The cumulative control of some mixed materials batching is realized by batching scale. This accurate cumulative control can cut down the cost of manufacture, improve the quality of the product and enhance the efficiency of labor. The paper first has an introduction to the status of development for batching scale controller at home and abroad, and then components and operating principle of the batching scale. According to the design requirements for flow control of a batching scale, this paper designs a batching scale controller with AT89C52 single chip microcomputer as the master control chip. This paper analyzes the working principles of the system and some key technical issues of the application based on the IGBT apparatus, which include drive circuit, snubbed circuit, protection and controlling the quantity of heat, and so on. In the aspect of microcomputer control, it has discussed the principle of number touch off、number velocity testing、current/velocity controller、number PWM modulator and presents the hardware or software scheme to achieve it. Photoelectric encoder is used in this system to measure the speed of D.C. motor. The result of the measurement is sent to A/D converter after passing the filtering circuit, and finally the feedback single is stored in the single-chip computer and participates in a PI calculation. By real time testing dandy adjusting the motor’s velocity/current, this timing system can get quick and exact timing result. Keywords reversible DC timing system Pulse-Width Modulation number