基于PLC的纸纱复合袋糊底机的控制系统研究

发布时间：2018-11-09 17:53

【摘要】：随着社会的不断发展,人们的环保意识逐渐增强,以易降解的纸质包装取代塑料包装已成为包装行业发展的必然趋势。新型纸纱复合袋具有强度高、韧性好、节省材料等优点,可应用于水泥、石灰、化工原料等产品的包装。目前,这种新型环保包装袋已成为纸质包装中的主流产品。但是,纸纱复合袋的糊底工序繁多,因此国内针对纸纱复合袋的糊底设备还存在很多不足。而国外的糊底设备工作效率高且自动化程度高,但是价格较高、后期维护不便,生产成本过高,不利于企业经营。所以,设计符合我国实际使用需求的纸纱复合袋糊底设备,具有重要的现实意义。本文针对我国企业的需求,以纸纱复合袋的糊底工艺为基础,设计了一套基于PLC的纸纱复合袋糊底机的控制系统,其主要内容分为三大部分:糊底机控制系统设计、纠偏控制系统设计、监控系统设计。首先,根据纸纱复合袋糊底的工作流程、技术参数和控制要求,并在对几种现代工业设备的控制方式比较后,确定了以S7-200型PLC为糊底机控制系统的核心,设计了一套由PLC、温度传感器、光电传感器、步进电机、触摸屏等构成的控制系统,并根据控制方案,设计了控制系统的硬件部分和软件部分。其次,针对纸袋在糊底过程中的跑偏问题,设计了纠偏控制系统。利用电桥平衡原理将检测到的光信号经过A/D转换模块后转化为PLC可识别的电信号与纸袋在正确位置时的电信号进行对比。若对比结果不一致时,则判定纸袋跑偏,此时输出脉冲至步进电机驱动器,驱动电机工作;若对比结果一致,则判定纸袋没有跑偏,则不输出脉冲,纠偏机构不启动。系统分为检测部分和控制部分,包括跑偏检测装置、测量电路、步进电机驱动程序、信号采集程序等。最后,使用西门子公司推出的MP277型触摸屏作为人机界面,以便操作人员可以通过人机界面监控生产线的运行状态。本文设计了用户登陆画面、参数设置画面、运行状态画面、故障显示画面等主要界面,使用WinCC flexible组态软件组态画面,完成人机界面的绘制。本文针对糊底机存在的问题,设计了一套基于PLC的糊底机的控制系统,采用PLC为控制核心,结合温度传感器、光电传感器等器件,通过触摸屏实现对生产线的远程监控,系统可根据用户需要的纸袋尺寸自动糊底,使糊底效率和自动化程度都有所提升。
[Abstract]:With the development of society, people's awareness of environmental protection is gradually strengthened. It has become an inevitable trend of packaging industry to replace plastic packaging with degradable paper packaging. The new paper yarn composite bag has the advantages of high strength, good toughness and material saving. It can be used in the packaging of cement, lime, chemical raw materials and so on. At present, this new environmental-friendly packaging bag has become the mainstream of paper packaging products. However, there are a lot of bottom paste processes of paper yarn composite bag, so there are still many deficiencies in domestic paper yarn composite bag paste equipment. The foreign equipment has high efficiency and automation, but the price is high, the later maintenance is inconvenient, the production cost is too high, which is not good for enterprise management. Therefore, it is of great practical significance to design the paper yarn composite bag bottom equipment which meets the practical needs of our country. In this paper, according to the demand of our country's enterprises, a control system of paper yarn composite bag paste bottom machine based on PLC is designed. The main content is divided into three parts: the design of the bottom paste machine control system. Deviation correction control system design, monitoring system design. First of all, according to the working flow, technical parameters and control requirements of the paper yarn composite bag paste bottom, and after comparing the control methods of several modern industrial equipments, it is determined that the S7-200 PLC is the core of the bottom paste machine control system, and a set of PLC, is designed. The control system is composed of temperature sensor, photoelectric sensor, step motor, touch screen and so on. According to the control scheme, the hardware and software parts of the control system are designed. Secondly, aiming at the deviation problem of paper bag in the process of paste bottom, a deviation correction control system is designed. By using the bridge balance principle, the detected optical signals are converted into PLC recognizable electrical signals after the Ar / D conversion module and compared with the electrical signals of the paper bags at the correct position. If the contrast result is not consistent, the paper bag deviation is determined, and the output pulse is output to the stepper motor driver to drive the motor; if the comparison result is consistent, the paper bag does not deviate, then the paper bag does not output the pulse, and the rectifying mechanism does not start. The system is divided into detection part and control part, including offset detection device, measuring circuit, stepping motor driver, signal acquisition program and so on. Finally, the MP277 touch-screen produced by Siemens is used as the man-machine interface, so that the operator can monitor the running state of the production line through the man-machine interface. In this paper, the user login screen, parameter setting screen, running state screen, fault display screen and other main interfaces are designed. The configuration screen of WinCC flexible configuration software is used to complete the drawing of the man-machine interface. In this paper, a control system of bottom paste machine based on PLC is designed, which uses PLC as the control core, temperature sensor, photoelectric sensor and other devices. The remote monitoring of production line is realized by touch screen. The system can automatically paste the bottom according to the size of the paper bag, which can improve the efficiency and automation of the bottom paste.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP273;TB486

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