基于磨床plc控制系统设计.doc

摘 要 由于工厂企业中很多磨床年代久远，其工作性能已远远达不到现代生产的要求。因此有必要对旧式的常规电动机控制系统进行技术改造，以PLC取代常规的继电器，以达到磨床的控制要求。 本次设计介绍了M7120平面磨床PLC控制系统,并编写了PLC控制梯形图程序和指令表程序。简要叙述了M7120平面磨床继电器-接触器控制系统的工作原理及其运动形式。改由PLC控制系统后的磨床工作安全可靠，系统运行情况良好，磨削精度更高；利用PLC控制系统，实现了磨床启动、停止、砂轮转动、工作台移动和工作台转动，砂轮升降；提供过载、断相、零励磁和零电压保护；并因所吸工件的不同，灵活调节电磁吸盘的吸力大小。改由PLC控制后，其控制系统大大的简单化,并且维修方便,易于检查，节省大量的继电器元件,机床的各项性能有了很大的改善，工作效率有了明显提高。该项技术还可推广应用于自动化其他领域的控制系统中。? 关键词: PLC,面磨床,电器 Abstract Many grinders are too old to meet the needs of modern manufacturing in factories. So it is necessary to make some technological transformations on the old-style convention motor-control system. Change them by the PLC substitution conventions relay, to meets grinders control requirements. This paper introduces the survey of invariable program timers and M7120 the vertical shaft frustum surface grinding machine PLC control system, and has compiled the PLC procedure trapezoidal chart and the directive statement table. In this paper, the principle of work and the movement form of M7120vertical shaft frustum surface grinding machine relay - contact device control systems is briefly introduced. The safety will be significantly changed and the operation situation will be better, the grinding precision is also higher. Using the PLC control system, the grinder’s starting, stopping, the grinding wheel’s rotation, and work table’s moving and rotation can be realized. And the grinding wheel fluctuation has two control modes, manual and automatic. It provides the protection like overload, break, zero excitation and zero potential. It attracts the work piece with different nimble adjustment magnet chuck suction size. After changing the PLC control system is largely simplified, and services conveniently, easy to inspect. It also saves large sum of relay element. The performance has the very big enhancement, and the working efficiency had the distinct enhancement. This technology ma