我们大修的一台QY20A汽车起重机解体后发现其伸缩臂液压缸缸筒严重弯曲,该缸筒外形尺寸见图1。为便于分析,建立直角座标“x-y-z”,液压缸轴线为z—z,起重臂变幅运动方向为y-y(图1、图2)。先测得缸筒原始弯曲状况,将缸筒平放,支点为A、B,间距为8m。 位置一:缸筒+x方向朝上,用水平仪测得的+x方向弯曲状况见图3 We overhaul a QY20A truck crane disintegration found its telescopic cylinder cylinder severe bending, the cylinder dimensions shown in Figure 1. For ease of analysis, a Cartesian coordinate “x-y-z” is established, the cylinder axis is z-z, and the boom luffing motion is y-y (Figure 1, Figure 2). First measured the original cylinder bending conditions, the cylinder flat, fulcrum A, B, spacing 8m. Position 1: Cylinder + x direction upward, measured by the level of + x direction bending conditions shown in Figure 3