连续电镀锡板生产线电控系统
Electrical Control System for Continuous Electrolytic Tinning Plate Production Line
镀锡板主要用于包装业,它具有卓越的耐腐蚀性能、漂亮的外观、轻度高、质量轻、良好的可成形性,以及良好的耐有机物质、稀酸、碱和盐侵蚀性能。镀锡板还可进一步细分为两类:食品类(即食品包装产品)和一般用途类(即非食品包装产品),镀锡板产品的质量和速度、带宽、带厚、锡层厚度给定等多种因素有关,所以对电控系统的要求非常高。
Tin plate is mainly used in packing industry and it has excellent corrosion stability, beautiful appearance, light weight, good formability, organic materials resistance, diluted acid, alkali and salt corrosion resistance. Electrolytic tinning plate also can be separated into two categories: food sector (namely food packing) and common sector (non-food packing product). The quality of electrolytic tinning plate has relations with speed, width, thickness, layer thickness and other factors. Therefore, it has very strict requirements on electrical control system.
我公司承接的海南海宇2#连续电镀锡板生产线电控系统2009年6月顺利投产。生产线最高运行速度可以达到400m/min(目前在国产镀锡板生产线中仍然是最高),被日本同行业对生产线的评价为:“树立了中国镀锡板生产线的里程碑”。
The electrical control system for continuous electrolytic tinning plate production line No.2 for Hainan Haiwoo Tipplate Industry Co., Ltd was put into production successfully in June 2009. The maximum running speed of the production line can reach 400m/min. The appraisal on the production line from the kind of Japan: it built the landmark of Chinese tinplate production line.
电控系统组成分为:传动系统、仪表系统、MCC系统、上位监控及操作系统。传动系统、仪表系统、MCC系统分别由一台SIEMENS大型控制器S7-400系列PLC控制,控制器之间、控制器与上位监控系统之间采用高速、稳定的工业以太网通讯,PLC和传动以及电解电源系统、电镀电源系统、软熔系统采用具有国际先进水平、性能稳定的现场总线PROFIBUS-DP(西门子双绞屏蔽电缆或光纤介质)网络通讯,传动(西门子、ABB或Parker SSD或根据客户指定)系统采用多传动共直流母线结构的矢量控制器,能量在直流母线上自由分配,从而使得系统的能耗大大降低,系统按照先进的数学模型进行负荷分配,系统运行稳定,各段速度和张力控制精度较高。
Electrical control system is separated into drive system, meter system, MCC system, upper monitoring and operating system. The drive system, meter system and MCC are controlled by a large sized SIEMENS controller PLC of S7-400 series. High speed and stable industrial Ethernet communication is adopted between controllers, controller and upper monitoring system. PLC, driving and electrolysis power supply system, galvanization power supply system and soft melting system adopts filed bus PROFIBUS-DP network communication with international advanced level, stable performance. Driving system (Siemens, ABB, Parker SSD or the one appointed by the client) adopts vector controller with DC generatrix structure. The energy can be distributed freely on the DC generatrix and the system runs stable. The speed and tension of all sections have better controlling precision.
整条线稳态调速精度可以达±0.1%,张力稳态精度±0.2%。
The speed regulating precision in the whole line under the stable status can reach ±0.1% and the tension under the stable status is controlled at 0.2%.
在线锡层测厚仪可以实时监控锡层的厚度,根据实时监控数据对电镀电流进行闭环控制,从而使锡层厚度控制更加精确。软熔也是镀锡板生产过程中的非常重要的环节,它决定了锡层在钢板表面的附着能力以及产品表面的光洁程度,通过在线监测对软熔电压进行闭环控制,同时可人工微量调整,使用更加方便、简单。
The thickness tester on line for tin layer can monitor the thickness of tin layer at real time. According to the real time monitor data, it can adopt closed-loop control on electroplate current, which can make thickness control of tin layer more accurate. Soft melting also is the very important link during the production of tin plate, it depends the adhesive capacity of tin layer on the surface of steel plate and polishing level of the surface of product. Through the on line monitoring, it can realize closed-loop on soft melting. Meanwhile, it can regulate lightly manually and it makes the use easy and simple.