电动葫芦具有结构轻巧紧凑、操作维修简易方便等特点,常常做为各类起重机起升机构和小车运行机构使用,它既可以单独使用,如悬挂轨道电动葫芦,亦可以与单(双)梁配合使用,如电动单梁(悬挂)起重机、轻型葫芦双梁起重机、电动葫芦门式起重机等,因而它的应用场合非常广泛。但是在安全技术检验过程中发现相当一部分在用电动葫芦的电控系统与《起重机械监督检验规程·桥架型起重机监督检验内容要求与方法》(以下简称《检规》)的要求不符和电源电路中未设断相与相序保护继电 Electric hoist with compact structure, easy operation and maintenance features, often as a variety of crane lifting mechanism and trolley operating agencies, it can be used alone, such as hanging track electric hoist, but also with a single (double) beam with Use, such as electric single-beam (suspension) cranes, light-weight hoist double girder cranes, electric hoist gantry crane, etc., so its application is very wide. However, during the inspection of safety technology, a considerable part of the electric control system of electric hoist was found to be incompatible with the requirements of “Rules and Regulations for Supervision and Inspection of Cranes and Overhead Inspection of Cranes” (hereinafter referred to as “Inspection and Regulation”), Circuit is not set phase and phase sequence protection relay