The invention discloses a uniform velocity amplitude-varying control method for a jib crane. The method includes the first step of creating a mathematical model of a jib amplitude-varying system, the second step of determining the function of the driving speed and the working amplitude of an amplitude-varying mechanism, the third step of adding an function code (FC) function block to a programmable logic controller (PLC), inputting Matlab to work out the determined function, and converting a value preset by a control switch into a rotating speed set value depending on the working amplitude through a function generator, and the fourth step of working out the correcting speed in real time, i.e., the angle of a jib is read in real time through the PLC, the correcting speed is worked out, and the corrected rotating speed set value is input into a frequency converter so as to control the driving speed. The reverse thinking control mode is adopted in the uniform velocity amplitude-varying control method, the driving output speed is changed according to amplitude changes in the amplitude varying process, and goods move at a uniform velocity in the amplitude varying process accordingly. The controllability and stability of the crane adopting the control method are greatly improved, and production efficiency is greatly improved compared with that of a traditional method.
Uniform velocity amplitude-varying control method for jib crane
2016-02-17
Patent
Elektronische Ressource
Englisch
IPC: | B66C Krane , CRANES |
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