篦式冷却机液压传动同步驱动系统及PLC控制应用

篦床的运动速度取决于篦床下的气压大小和篦床上的物料厚薄,而篦床的驱动可采用机械驱动或采用液压驱动,后者具有传动功率大、传动平稳、速度控制容易等众多优点,可用于大型生产线篦冷机系统。文章详细阐述了篦冷机液压传动同步驱动系统构成及其PLC控制系统,重点包括篦冷机液压同步速度控制系统的设计方案、PLC控制系统的硬件配置和软件系统设计,以及控制方案的操作等。     

玻璃器皿压制生产线电气控制系统的研究

本文介绍了玻璃器皿压制生产线的电气控制系统，该系统为保证供料机，烘口机、输送带及机械手等协调工作，采用了自行研制的同步电动机为动力源，并选用了交流变频调速器进行无级调速，是一种较为实用的电气控制系统。     

SIMATIC PCS7系统及仪表在水泥生产中的应用

南方水泥有限公司（简称南方水泥）在桂林建设的两条5000t/d生产线,同步配套建设余热发电及粉磨线,由南京凯盛设计并总承包建设,一期首条5 000t/d生产线已于2010年2月份点火生产,目前生产运行正常。其DCS系统采用SIMATICPCS7V7.1集散控制系统,     

ABBAdvantOCS控制系统在2000t/d生产线上的应用

随着计算机技术的发展和广泛应用，计算机集散控制系统已经普遍用于各种工业生产，能够满足各种不同工艺生产的控制和管理要求，因此 ，我公司在新型干法水泥生产线上也引进瑞士ABB公司AdvantOCS开放控制系统，用于生产线上所有设备的计算机控制和管理生产。１AdvantOCS开放控制系统基本配置及硬件组成１．１系统基本配置ABBAdvant开放控制系统基本配置如图１。该系统有控制网络通讯和工厂网络通讯的功能。控制网络通讯采用MASTERBUS３００总线（简称MB３００）。MB３００是为满足AdvantOCS系统高速通讯高性能的串行同步半双…     

基于现场总线的橡胶密封条生产线控制系统

将CC-Link现场总线技术应用于橡胶密封条生产线控制系统,通过现场总线将密封条生产线上的相关设备联网,形成现场总线网络,利用现场总线网络传输速度高的优点,实现橡胶密封条生产线上所有联网设备工艺参数的实时监控和同步调整,从而提高橡胶密封条生产线的运行速度,降低废品率,在保证产品质量的前提下还可降低能耗和单耗。     

国产自动化仪表在新型干法水泥生产线上的应用

广东塔牌集团股份有限公司从2003年投产第一条5000t/d新型干法水泥生产线至今的5条5 000t/d生产线,大量采用了国产自动化仪表.文章主要介绍了其使用的国产化集散控制系统、气体分析仪以及窑筒体扫描仪的结构、原理、性能及应用情况.实践证明,国产自动化仪表是能够在大型现代化水泥工厂使用的,其整体技术水平已与国际同步.     

ABB Industrial IT系统在水泥生产中的应用

我公司2500t／d熟料生产线于2003年8月16日竣工点火投产。该生产线由天津水泥工业设计研究院设计，自动控制采用DCS系统来完成，产品选用瑞士ABB公司的Industrial IT系统。作为自动控制的基础及平台，该系统在现场的数据通讯、采集、处理联调中表现出了理想的稳定性和可靠性，提高了整条生产线的自动控制水平，保证了水泥生产工艺控制中各环节的稳定、连续运转。     

基于RBF神经网络塑料成型生产线温度控制系统研究

基于RBF神经网络的生产线控制方案,采用Matlab搭建实验仿真平台对温度控制系统进行实验设计,并对控制系统进行验证分析。仿真结果表明:基于RBF神经网络塑料成型生产线温度控制系统具有较好的抗干扰性、稳定性,控制系统能够有效满足于控制需求,在塑料成型生产线温度控制中,恒定性和鲁棒性控制效果良好。基于RBF神经网络塑料成型生产线温度控制系统能更大程度上提高系统智能化水平与温度控制精度,提升产品质量。     

水泥生产线DCS控制系统故障的分析处理

我公司原有2条2300t/d生产线,后又新建了1条5000t/d生产线,3条生产线均采用集散式DCS控制系统,自动化程度较高,运行安全可靠。但由于安装和外界环境等因素的影响,也曾出现过一些问题,现就几起典型故障介绍如下。1ABB Freelance2000集散控制系统原有的2条2300t/d熟料生产线采用A     

PLC系统抗干扰实例分析

我公司1500t/d生产线采用PLC控制系统,由一个主站、二个从站组成。主站与从站远距离通信采用串行、异步、半双工方式,通信电缆采用四芯屏蔽电缆。PLC控制系统的稳定性直接影响整个生产线的正常与否,而干扰对PLC控制系统的运行影响很大,干扰严重时会造成生产事故。现以我公司PLC     

数字滤波技术在失重式计量加料系统中的应用

沦述了将数宇滤波技术应用于失重式计量加料控制系统,以提高挤出过程中挤出流量的在线测量精度;同时介绍了失重式计量加料系统的机械结钩及其控制原理,详细说明限幅一递推平均滤波算法在失重加料控制系统中对挤出流量所进行的数值处理,并通过复合板材挤出过程中测得的在线挤出流量数值得到验证。     

聚合物精密挤出过程中挤出流量的在线测量及控制方法

介绍了以PLC为控制核心的聚合物精密挤出成型过程的参数测量控制系统,针对描述挤出过程稳定性指标的参数.挤出流量的测量进行了详细描述,根据控制精度和挤出制品的不同,可以分别采用齿轮泵转速测量法、失重计量加料法、制品外径测量法3种不同在线测量及相应的控制方法,同时从测量原理、测量精度及应用范围等方面进行比较分析.     

On-Line measurement of parison geometry during blow molding: Parison swelling for three high-density polyethylenes with different molecular weights and molecular weight distributions

An image analysis technique has been developed to measure diameter and thickness distribution of a parison during the extrusion stage in blow molding. The system operates on-line during extrusion on any commercial blow-molding machine. The system has been developed to help development of new blow-molding resins by increasing our understanding of the connection between polymer structure and parison shape. The system can also be used for die design during optimization of a production process. The combined use of experimental design and multivariate projection techniques makes this an efficient tool for the practical processing engineer. Experiments done on three high-density polyethylene blow-molding resins show the importance of measuring the time dependence of the diameter and thickness distribution under different extrusion conditions for a given polymer. Our results show that many of the swell and sag related properties we see cannot be directly inferred from standard laboratory swell-experiments.     

An extrusion system for the processing of microcellular polymer sheets: Shaping and cell growth control

A new processing system for the extrusion of microcellular polymer sheets is presented. Specifically, the detailed design of a shaping and cell growth control system is discussed in the context of an overall extrusion system design with particular emphasis on the system level functional requirements of cell nucleation, cell growth, and shaping. The principle of the basic extrusion system design is to shape a nucleated polymer/gas solution flow under pressure and accurate temperature control. In this way, the initial cell growth is controlled so as to prevent degradation of the nucleated cell density during shaping. Two foaming die designs for satisfying the initial shaping and cell growth requirements are presented. Critical experiments are then presented which verified the concept of shaping a nucleated polymer/gas solution. Moreover, these experiments demonstrated the feasibility of the overall microcellular polymer sheet extrusion system design.     

挤出加工过程的计算机在线控制

讨论了挤出加工过程的影响因素，介绍了应用计算机对挤出加工过程进行在线控制的策略和方法。     

ON-LINE ROBUST CONTROL BASED ON AN EXTERNAL LOOP

A method of on-line robust control based on an external loop was proposed. The control structure was set up by adding an external loop to the conventional feedback control system. A filter was implemented in the external loop for robust control. Design of the filter was based on a robust stability index (RSI) which was on-line determined. The proposed robust control was carried out without changing the original feedback design of the control system.     

An integrated approach to computer-aided operation of batch chemical plants

The design and implementation of a computer-based system which integrates planning and plant control of batch chemical plants is presented. Such a system is required so that the full benefits of computer-aided operation, increased production, improved product quality and reduced operating costs may be realized. A functional analysis of the operational requirements of batch plants indicate that a hierarchical and distributed system is favoured. A new operational activity, batch management, is defined which provides the necessary integration by coordinating the activities of the planning and control levels. Batch management allows the control level activities to be driven by events at the planning level such as changes in product demands. It also provides a feedback path from the control level back up to the planning level so that the inherent variability of batch processes can be accounted for and overcome. This is achieved by dynamic, on-line rescheduling. A very general implementation of this design is described. The implementation is centred around a real-time database and permits the operation of a wide range of processes including multiproduct, multipurpose plants with both serial and parallel lines, intermediate storage, shared utilities, etc. To demonstrate its effectiveness, two applications are presented, one in conjunction with an on-line, real-time control system, and the other with an off-line discrete event simulator. The significant benefits achieved in terms of improved operation are discussed.     

基于虚拟仪器技术的煤气发生炉气化层温度控制系统设计

基于LabVIEW的虚拟仪器温度测控系统是针对煤气发生炉工艺流程运行特点的要求而设计的,通过在线气化层温度测量,实时检测造气炉温度状态和变化趋势,实现对工艺参数的动态调整和闭环控制。介绍该测控系统的设计方案、软件设计和系统实现。     

A mathematical model for predicting dynamic behavior of a plasticating extruder

A mathematical model was developed to predict the dynamic behavior of flowrate and melt temperature in a plasticating extruder caused by changes in operating variables such as screw speed, back pressure and barrel temperature. The model has application for on-line computer control of an extrusion process or for simulation purposes off-line. Experimental data for developing the model was obtained from a 2½ in. diameter plasticating extruder producing high impact polystyrene sheet.     

基于无线HART的智能仪表在线监控系统

为了充分利用传统HART仪表,提高控制系统的可靠性,减少现场仪表的维护量并降低维护费用,提出了一种基于无线HART协议的智能仪表在线监控系统,给出了系统的软、硬件设计思想和实现方法.