大型龙门起重机是工业和建筑业中最常用的起重和搬运设备。它们通常用于港口、建筑工地和制造工厂等工业环境中的重型起重和搬运任务。龙门起重机配备了可以举起和放下重物的起升机构。该机构通常包括起重机或绞车系统，根据起重机的设计，该系统可以是电动、液压或其他方式驱动的。它的特点是其高大、坚固的钢结构横跨一个区域，由两侧的支腿或柱子支撑。

Gantry cranes are widely used in various industries of the national economy such as metallurgy, electric power, ports, logistics, machinery manufacturing and marine engineering. They are important process equipment for industrial production and are related to the safety of people's lives and the safety of national economic operations. and social stability are important components of public security in all countries. The development momentum of my country's hoisting machinery industry is strong. As of the end of 2017, the number of hoisting machinery in my country reached 2.2375 million units. According to the "Notice of the State Administration for Market Regulation on the Safety Status of National Special Equipment in 2017", the accident rate and fatality rate of cranes in my country rank first among the eight categories of special equipment. Therefore, there is an urgent need for an effective means to ensure the safety of in-service cranes. Safe and reliable operation of machinery.