牛奶厂乳粉自动包装称重控制系统的设计
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密 惠 保
摘 要
本文详细介绍了国内自动包装称重控制系统的发展现状，发展中所面临的问题。从产品质量、性能及应用方面看自动包装称重机的差距；整个行业看国产自动包装称重机所存在的问题以及它的发展趋势。同时也详尽的介绍了此次设计中最重要的组成部件单片机的概念、工作原理及设备总体结构，其中包括MCS-51的发展历程，选型依据。设计了一种基于单片机MCS-51的自动包装称重机，介绍了所选用的8031、8255等单片机。整个系统通过传感器检测产品数目和重量，并且通过数码管实时显示，当下落了设定的产品数目之后停止传送带2的传送。同时启动传送带1，带动箱子到位。根据设计对单片机的I/O口的输入输出进行了分配，并且编写出系统的流程图、电路图及程序。介绍了光电传感器和控制电机的工作原理，随后又介绍了光电传感器的工作原理和传感器选择与设计：光电开关的原理、光电开关应用设计。电机控制系统及系统电源设计，交流电机M1、M2控制系统。最后设计总体程序，实现对产品的自动包装称重。
关键词：自动包装称重机，单片机，传感器
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Abstract
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This paper describes the domestic auto packaging weighing control system development, the problems facing the development. From product quality, performance and application to see the difference between automatic packaging weighing machine; the domestic auto industry to see packing the problems weighing machine and its trends. At the same time also a detailed introduction to the design of the most important component parts of the concept of SCM, the overall structure works and equipment, which includes MCS-51 development process, selection basis. Designed based on MCS-51 microcontroller automatic weighing packaging machine, and introduces the use of 8031,8255 and other microcontroller. Products through the system sensors detect the number and weight, and through digital tube display, when the whereabouts of a number of products set to stop after the delivery conveyor 2. Start a conveyor belt at the same time, bring the box in place. According to the design of the microcontroller I / O port input and output for the distribution, and preparation of a system flow chart, circuit diagram and procedures. Introduces the photoelectric sensors and controls the motor works, and later introduced the principle of photoelectric sensors and sensor selection and design: the principle of photoelectric switch, photoelectric switch applications. Motor control system and the system power supply design, AC motors M1, M2 control system. The final design of the overall program, the automatic packaging of the product weight. [来源：http://think58.com]
Keywords: automatic packaging weighing machine, microcontroller, sensors
[资料来源：THINK58.com]