二自由度起重机机架模型
two-degree-of-freedom crane system
起重机起升机构
hoisting mechanism of crane
crane lifting mechanism
摇臂式凸轮滚轮机构
arm type cam roller mechanism
车架滚轮调整步骤
carriage roller adjustment procedure
提升主架承载滚轮调整检查
mast load roller adjustment check
2000kN坝顶门式起重机
2 000 kN dam－ crest portal c rane