论文部分内容阅读
一、现状目前在设计中,对动臂变幅起重机起升高度曲线(H-R 曲线)的绘制,一般有下述两种方法。1.图解法以起重机的回转中心为纵坐标轴Y,支腿所在平面的水平线为横坐标轴X,当臂架长度一定时,按比例画出臂长,且根据e_2值定出滑轮组中定滑轮的中心位置B。然后以B 点为圆心,以长度b 为半径(b 为吊钩滑轮组最短距离,即B 点至吊钩支承面的最短距离),向下画弧,与垂直线交于A 点,则A 点就是臂架与水平面夹角为θ时,吊钩的极限高度。改变臂架位置
First, the status quo Currently in the design, boom luffing crane lifting height curve (H-R curve) of the drawing, there are generally the following two methods. 1. Graphic method The center of rotation of the crane is the Y axis, the horizontal line of the plane where the outrigger is located is the X axis. When the length of the boom is fixed, the arm length is drawn according to the ratio and the pulley set is determined according to the value of e_2 Pulley center position B. Then take the point B as the center and the length b as the radius (b is the shortest distance of the hook pulley block, that is, the shortest distance from the point B to the hook support surface), draw the arc downward and make the point A with the vertical line. Then point A Is the boom and the horizontal angle θ, the ultimate height of the hook. Change the boom position