Boom control device of aerial work platforms

摘要

(57) Abstract Objective In the operation in height car, the bucket and the like is supportedTelescopic boom expansion and contraction when it expands manipulates in state of the tip going downManipulation of boom is made easy. Constitution Telescopic boom 4 from horizontality falling down was made possible underIn operation in height car 1, the ground clearance of undercarriage H which is configurated beforehandWith from detection value of boom length sensor 16 telescopic boom 4To calculate marginal relief angle min, boom relief angular sensor 1When detection value of 5 has reached to marginal relief angle min, reliefWhen control lever 18 is falling down Drive, that valve DriveTo cut off the transmission to relief control valve 23 of the signal, the expansion and contraction control lever- When 17 is expansion Drive, expansion and contraction that manipulate signalAs it transmits to control valve 22, telescopic boom 4 happening order runningTo output the valve Drive signal which motion is done to relief control valve 23, expansion and contraction buHeight of the Tip of mu 4 is maintained in ground clearance of undercarriage H.