HOISTING LOAD HORIZONTAL MOVEMENT CONTROL DEVICE OF CRANE

PROBLEM TO BE SOLVED: To provide a hoisting load horizontal movement control device for controlling a hoisting load to be moved in the horizontal direction along the ground or the like by joint use of boom expansion and contraction motion and winch hoisting and lowering motion. SOLUTION: A controller 20 controls switching of an expansion and contraction control valve 4 according to a control signal 20a for the expansion and contraction control valve obtained from an expansion and contraction operating signal (a). On the other hand, according to the expansion and contraction operating signal (a), a boom length detecting signal La, a derricking angle detecting signal Θa and a let-out length detecting signal Sa, a valve switching direction and a valve switching amount δs required to obtain the conformity of the wire driving amount Sw-Sw0 with the fluctuation S-S0 of the actual wire let-out length not to change the lowering height of a hook 11 are found. The switching of the winch control valve 7 is controlled according to a control signal 20b of the winch control valve.