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本文介绍了国内流质瓶装自动灌装机械的发展现状，以及存在问题，同时介绍了可编程控制器的工作原理，选型依据。设计了一种基于PLC的流质瓶装自动灌装检测质量控制系统，详细介绍了所选用的西门子S7-200 PLC以及同类型的S7-300 S7-400PLC，根据设计要求对PLC的输入输出I/O进行了分配，并且编写系统运行的梯形图。介绍了用于计算流质数量的光电传感器的工作原理，并设计了数电路，实现对流质的自动灌装。当瓶口到达料口处时，下料管通过叶轮转动使流质逐渐落下，叶轮是通过直流伺服电机M1减速后转动。当落入流质达到设定数N后，叶轮停止转动，直到随后的一个空瓶口对准下料口时，传送带停止转动，料口叶轮开始转动送料，以后重复此过程. 由西门子S7—200控制，光电传感器检测流质下落数目，并且通过数码管实时显示，当下落了设定数目之后停止电机M1的转动。同时启动M2，带动传送带。流质瓶定位也用一套光电传感器，当瓶子遮挡住红外光线时，传感器输出低电平。即当PLC相应输入口再次检测到低电平时候，停止M2，同时启动流质计数和M1，开始新瓶子的灌装。对质量的检测也通过称重传感器和位置传感器来设计.
关键词：PLC，传感器, 自动灌装,流质
Abstract
This article describes the domestic liquid bottle filling machinery, auto development situation, as well as the problems at the same time introduced a programmable controller working principle of selection based on. Design of a PLC-based automatic liquid bottle filling test quality control system, described in detail by the use of Siemens S7-200 PLC as well as the same type of S7-300 S7-400PLC, according to the design requirements of the PLC input and output I / O been distributed, and the preparation of system operation ladder. Describes the liquid used to calculate the number of photoelectric sensor working principle and design a few circuits, to realize the automatic liquid filling. When the bottle is expected to reach the mouth, the next feed tube through the rotating impeller so that liquid gradually fall, the impeller is a DC servo motor M1 through the rotation after slowing down. When the liquid reaches the set into a number N, the impeller stops rotating, until the next blanking align an empty bottle mouth, the conveyor belt to stop turning, feed port impeller began to rotate the feed, after repeating the process. By a Siemens S7-200 control, photoelectric sensors to detect the whereabouts of the number of liquid and through real-time display of digital tube, when the whereabouts of the number of setting the rotation after the cessation of motor M1. At the same time start the M2, drive belt. Liquid bottle positioning also used a set of photoelectric sensors, infrared light, blocking the view when the bottle, the sensor output low. That is, when the corresponding PLC input is detected again, when low, stop M2, at the same time start the liquid counting and M1, start a new bottle filling. Detection of quality through weighing sensors and position sensors to design.
Key words: PLC, sensors, automatic filling, liquid
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