用于装配车间的起重机,由于安装工艺的要求,起升速度一般都设计得很慢,在空钩或吊运不太重物件时要占用大量辅助工时,尤其当起重机的起升高度较高时,会严重影响生产率。本文提出的变速装置,通过工程实例证明在这类起重机的起升机构中设置变速装置的必要性和可能性。文中介绍了该装置的结构、原理及保证起重机使用安全所采取的措施。可供改造这类起重机时参考。 The cranes used in the assembly shop usually have slow lifting speeds because of the installation process requirements. They require a large amount of auxiliary work hours when the hooks are not hung or are not heavy, especially when the lifting height of the cranes is high , Will seriously affect the productivity. The transmission presented in this paper demonstrates through engineering examples the necessity and the possibility of providing a transmission in a lifting mechanism of this type of crane. The paper introduces the structure and principle of the device and the measures taken to ensure the safety of the crane. For the transformation of such cranes reference.