METHOD OF AND APPARATUS FOR CONTROLLING STOPPING OF TURNING OF UPPER SWING UNIT FOR CONSTRUCTION MACHINES, AND ANGLE OF INCLINATION COMPUTING APPARATUS

摘要

A method of and an apparatus for controlling the stopping of turning of an upper swing unit for a construction machine having the upper swing unit provided on a lower body so that the swing unit can be turned with a cargo suspended from a predetermined portion of the swing unit, characterized in that the permissible conditions for a swing angle acceleration based on the lateral bending strength of the upper swing unit are calculated with reference to the swing radius and weight of the suspended cargo and the inertial moment and permissible load of the upper swing unit, the turning of the swing unit being then braked and stopped at a swing angular acceleration which meets these permissible conditions, and which is high enough to stop the swing unit without keeping the suspended cargo moving. The invention also relates to an angle of inclination computing apparatus for such a construction machine, characterized in that the angles of inclination in two different directions of a lower body are detected, or the angles of inclination in two different directions of an upper swing unit, which are made when the upper swing unit is in a position of a preset reference swing angle, is detected and stored, or an angle of inclination in one direction of the upper swing unit, which is made when the upper swing unit is in either of positions to two preset different reference swing angles, is detected and stored, the angle of inclination of the upper swing unit, which is made when the upper swing unit is in a position of an arbitrary swing angle, being then computed on the basis of these detected or stored angles of inclination.