PURPOSE:To align proceeding speeds of the right and left girders by controlling the speed with a load response type variable-capacity motor when the advance side girder tows the delay side girder in a crane using a connected girder with a deflection structure. CONSTITUTION:Pumps 11 and motors 10 on the right and left are adjusted under the same conditions in this device, when resistance values of the right and left girders 3 and 2 are equal, the girders 2 and 3 travel by receiving the same thrust. When the load of the girder 3 side is increased, the girder 3 side is delayed, a connected girder 4 is bent, the binding moment of the connected girder 4 is applied to the motor 10 of the girder 2, thus the operating oil pressure is increased for automatic adjustment to decelerate. On the other hand, the load of the girder 3 is shared by the motor 10 of the girder 2, thus the operation oil pressure is decreased for automatic adjustment to accelerate. As a result, the girders 2 and 3 are controlled to synchronously proceed.
展开▼
