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在计算塔式起重机整体稳定性时,除臂架①外,其它部分均可按刚性固接的假定进行计算,所谓刚性固接是指塔机在工作和非工作状态,这些部分的重心与塔机回转中心线(即塔身中轴线)的相对位置无改变(忽略微小的弹性变形及微小的弹性振动)。而臂架则因俯仰式臂架的俯仰,水平式臂架重载时不可忽略的较大弹性变形及受惯性冲击后远大于塔机其余部分的弹性振动而发生臂架重心与塔身中轴线相对位置的改变。这样在计算塔式起重机整体稳定性时,有必要将臂架与其余部分区别开来,按其在工作中对塔机整体稳定性的实际影响来处理臂架自重,笔者认为可有三种处理方法: 1)将臂架与塔机其它部分同等看待,用一个G(G=∑Gi i=1,2,3……)代表整体重量,并找出一个整机重心。这种方法的特
In calculating the overall stability of the tower crane, in addition to the boom 1, other parts can be calculated based on the assumption of rigid fixation. The so-called rigid fixation refers to the tower crane in working and non-working conditions, the center of gravity of these parts and the tower. The relative position of the machine’s turning centerline (ie, the axis of the tower body) has not changed (ignoring minor elastic deformations and slight elastic vibrations). The jib is centered on the axis of the boom due to the pitch of the luffing jib, the large elastic deformation that cannot be ignored when the horizontal jib is heavily loaded, and the elastic vibration that is much larger than the rest of the tower after the inertial impact. Relative position changes. In this way, when calculating the overall stability of the tower crane, it is necessary to distinguish the boom from the rest of the tower, and to handle the weight of the boom according to its actual effect on the overall stability of the tower crane during operation. The author believes that there are three possible treatment methods. : 1) Treat the boom as the same as the rest of the tower crane. Use a G (G=∑Gi i=1, 2, 3...) to represent the overall weight and find a center of gravity. This method is special