多台转鼓式微滤机多模式控制系统设计与实验

Design and Experiment of Multi-mode Control System of Multiple Microscreen Drum Filters

为了实现对循环水养殖系统中多台框架式转鼓式微滤机的控制,方便对系统进行管理和维护,节约生产成本,在分析框架式转鼓式微滤机工作原理和控制要求的基础上进行控制系统的硬件和软件设计,运用STEP 7 MicroWIN SP9 V4.0软件编写了10台转鼓式微滤机的3种运行模式控制程序,PLC在线监控和调试的结果表明:微滤机在手动模式、自动模式和定时模式下均可以正常工作;在水产养殖环境中,使用多模式软逻辑控制系统来控制多台转鼓式微滤机减速电动机和反冲洗泵的运行和停止,相比于易发生故障、检修不便的硬逻辑控制系统具有稳定性好、自动化程度高、成本低等优势,能够更好地应对系统出现故障的情况。研究结果可为转鼓式微滤机控制系统的完善和水产养殖系统装备自动化集成提供参考。

In order to realize the aim of controlling multiple microscreen drum filters with frame in recirculating aquaculture systems wastewater treatment processing,manage and maintain the system conveniently as well as save production costs,three kinds of operation modes control programs of ten microscreen drum filters were programmed with STEP 7 MicroWIN SP9 V4. 0 software. The results of PLC real-time monitoring and debugging showed that the operation modes of the control system could be switched freely,and the microscreen drum filters could work normally in manual mode,automatic mode and timing mode. More concretely,taking one of the filters as an example,for manual mode,the backwashing can be controlled and stopped at any time; for automatic mode,the start and stop of the reducer and the backwashing pump were controlled by two level switches,when they were triggered by the water in the drum,the backwashing was performed,when the water level was dropped below the low level switch,backwashing would stop,and if the switches had malfunctions,backwashing would not proceed; for timing mode,the backwashing time and frequency can be set according to the water quality.In aquaculture environment,the use of multi-mode soft logic control system to make multiple microscreen drum filters＇ reducers and backwashing pumps run and stop had the advantages of good stability,high degree of automation and low costs compared with the traditional hard logic control system which went wrong easily and was difficult to be overhauled,and the former can better cope with the problems of system failure. The research results can provide some references for the further improvements of control system of the microscreen drum filters and the automation integration of aquaculture equipments.