基于PLC的主运输皮带智能控制系统的研究与应用

皮带运输机是现代化煤矿高产高效的主要运输设备。采用防爆变频器与交流异步电动机构成交流变频拖动,是目前符合井下皮带运输机拖动要求且价格适中的最佳拖动设备。由于煤矿的特殊生产条件,皮带运输系统的运煤量是不均匀的。在负载较轻或无负载时,皮带运输机系统的高速运行,对机械传动系统的磨损浪费较为严重,同时电能消耗也比低速运行时大得多,但因生产的需要皮带运输机系统,又不能随时停车。结合井下皮带机运输系统的具体情况和要求,研制开发了一套S7-200 PLC结合变频器的井下皮带运输机智能控制系统。此系统根据负载的大小,来实时控制拖动电动机加速或减速,使皮带机处于最佳运行状态。此系统适用于煤量随时间变化较频繁的系统,可大大节约电能,降低皮带运输系统的设备损耗,延长设备的使用寿命。

Research and application on intelligent control system of main transportation belt based on PLC

Belt conveyer is the main transportation equipment of the modern coal mine.The AC variable frequency drive system is made up of explosion-proof converter and ac asynchronous motor,it is the best driving equipment which meets the requirement of belt conveyer underground and has an affordable price.Because of the special condition of coal mine,the amount of the coal transported by the belt transportation system is not uniform.When the load is small or none,the attrition of mechanical transmission system caused by the high speed driving of belt conveyer is serious,and the electric energy consumption is more than the low speed condition,but the belt transportation system can’t be stopped due to the demand of production.According to the special condition and requirement of the belt transportation system underground,we invented an intelligent control system of belt transportation system which S7-200 PLC combined with frequency converter.This system can control the speed of the electromotor by the lord,making the belt work at its best condition.This system fits for changing amount of coal with time,it can save electric energy,reduce the equipment loss of the belt transportation and increase the service life.