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1 引言 随着交流变频调速技术的成熟,变频调速与PLC控制相结合在门机上已经成功应用并有普及趋势。抓斗作业是门机的主要功能之一,如何实现抓斗的防撞与防漏,并使主副机在抓斗升降过程中均衡受力,是提高门机性能的一道难题。在大连港务局
1 Introduction With the exchange of frequency control technology is mature, frequency control and PLC control combined on the door machine has been successfully applied and popular trend. Grabing operation is one of the main functions of door opener. How to achieve the anti-collision and leakage prevention of the grab and balance the force of the main and auxiliary machines during the lifting and lowering of the grab are a difficult problem to improve the performance of the door opener. In Dalian Port Authority