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港口门座式起重机(以下简称门机)是港口码头前沿装卸一般散杂货的通用港口装卸起重机,在各海港、内河码头都广泛使用。门机变幅机构的变频控制由于起升机构电动机功率一般较大,对起升机构进行改造一次性投资过高;大车部分工艺要求相对简单,变频改造后效果不是很明显,所以目前国
Port Gantry Crane (hereinafter referred to as door machine) is a general loading and unloading cranes for loading and unloading bulk groceries on the front of the port. It is widely used in all seaports and river terminals. Frequency control of door heave mechanism As the hoist motor power is generally larger, the one-time investment in the lifting mechanism to transform too high; cart part of the process is relatively simple, the effect is not obvious after the conversion, so the current