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起重臂架是起重机的主要部件,在使用过程中,由于臂架头部滑轮组受力不匀或起重臂超载,或司机操作不当造成滑轮轴变形,使臂架在维修时,无法将滑轮组和滑轮轴拆卸,这种情况在直线型臂架的头部结构中经常发生。为了解决这个问题,上海港务局第12装卸区根据多年维修经验,对这种型式的结构进行了改进,其效果良好。原结构中安装时,首先分别将滑轮放入头部,然后将滑轮轴由侧板穿入滑轮组轴孔内。滑轮轴要穿过6个孔之后才由二边螺帽固定(见图1)。这种连接方式给安装、维修带来不便。为了方便臂架头部滑轮组装拆,现将原
The lifting boom is the main component of the crane. During use, the pulley shaft is deformed due to uneven force of the pulley arm assembly or the overload of the lifting arm, or the driver’s improper operation causes the pulley shaft to be deformed, so that the arm frame cannot be maintained during maintenance. With the removal of the pulley shaft, this happens frequently in the head structure of the linear boom. In order to solve this problem, the 12th loading and unloading area of Shanghai Port Administration Bureau has improved this type of structure based on years of maintenance experience, and its effect is good. When installing in the original structure, the pulleys are respectively put into the head, and then the pulley shaft is penetrated into the shaft hole of the pulley block through the side plate. The pulley shaft is passed through the six holes before it is fixed by the two-way nuts (see Figure 1). This connection method inconveniences installation and maintenance. In order to facilitate the assembly and disassembly of the boom head pulley, the original