The invention discloses a crane as well as a device and a method for controlling the rotating speed of the crane. A hydraulic rotation system comprises an engine, a hydraulic pump and a hydraulic motor. The method for controlling the rotating speed of the crane comprises the steps as follows: collecting the rotating speed of the engine, the displacement of the hydraulic pump and the displacement of the hydraulic motor; calculating the maximum flow of the hydraulic rotation system and the maximum displacement, which is corresponding to the rotating speed of the engine, of the hydraulic pump according to the rotating speed of the engine; controlling the displacement of the hydraulic pump and the rotating speed of the hydraulic motor by adjusting the output current of a controlling handle according to the maximum displacement in order to guarantee that the rotating speed is not higher than the maximum rotating speed under the working condition of the hydraulic rotation system; and comparing the relation between the torque required by the hydraulic system and the output torque of the engine in real time and adjusting the rotating speed of the engine and the displacement of the hydraulic pump so as to avoid flame-out of the engine. According to the crane as well as the device and the method for controlling the rotating speed of the crane, the controlling dead zone of the hydraulic pump can be reduced, and the system controllabitity is further improved; and at the same time, the maximum rotating speed which the rotating mechanism can reach is guaranteed, and flam-out of the engine is avoided, so that the working efficiency is improved.
Crane as well as device and method for controlling rotating speed of crane
2015-09-30
Patent
Elektronische Ressource
Englisch
IPC: | B66C Krane , CRANES |