单臂架门座式起重机结构简单、起重量大自重轻。
Simple arm frame gantry crane structure, lifting large light weight.
目的：介绍切开复位单臂外固定架（以下简称单臂架）治疗不稳定胫骨骨折体会。
Objective:To introduce the experience of cut reduction in treating unsteady tibial fracture of unilateral axial combined internal fixator (short for unilateral axial).
门座式起重机分单臂架和四连杆两种类型，起重机的起升、变幅、回转和行走四大机构均采用交流变频调速，整机采用PLC控制，使用性能优越。
Portal crane sub frame and four-link arm two types, from the crane hoisting, luffing, slewing and walking four agencies ac frequency control, the machine USES PLC control, superior performance.
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