Variable-frequency-speed-adjusting control system and method of tower-crane rotating mechanism

Abstract

The invention discloses a variable-frequency-speed-adjusting control system and method of a tower-crane rotating mechanism. The control system comprises a linkage table, a limiting signal collecting device, a PLC and a frequency converter, wherein the limiting signal collecting device and the frequency converter are connected with the PLC, the frequency converter is connected with the linkage table and rotating motors of the rotating mechanism, and a sequential control loop is formed by the linkage table, the frequency converter, the rotating motors of the rotating mechanism, speed reducers and a rotating bearing. Compared with the prior art, the variable-frequency-speed-adjusting control system and method have the advantages that as a current control step-less-speed-adjusting mode is adopted, the zero speed of the tower-crane rotating mechanism can be smoothly and stably increased to the maximum speed under controlling of a driver, the maximum speed of the tower-crane rotating mechanism can be also smoothly and stably decreased to the zero speed under controlling of the driver, and the whole work efficiency and the working stability of a tower crane are improved accordingly.

Description

technical field [0001] The invention relates to a frequency conversion speed regulation control system and a control method of a tower crane slewing mechanism. Background technique [0002] At present, the slewing mechanism of the tower crane is a transmission device that changes the rotation angle of the operation for the hoisting behavior of the tower crane and increases the range of action to provide horizontal rotation motion power. Due to the large rotation range of the slewing arm of the tower crane (usually the rotation angle reaches 2.5-3 circles or 1080 degrees), the large moment of inertia and the rapid change of the running speed, the impact on the tower crane during the slewing process is relatively large; and the slewing mechanism It is the one with the most complex working conditions among the three mechanisms of the tower crane. It is not only affected by the size of the hoist, but also by the inertial force and wind force. Especially now that the boom of the ...

AI Technical Summary

Problems solved by technology

Although the slewing mechanisms are independent of each other, they all go through the same operation process of starting, accelerating, constant speed, decelerating, and slowing down. In order to improve efficiency, the operator generally performs compound actions. If the transmission scheme and control system are not scientific Reasonable and uncoordinated matching will inevitably lead to low efficiency and even affect the safety of equipment

The speed regulation performance of the slewing mechanism directly affects the working stability of the tower crane; if the slewing starts too fast or decelerates too fast, the tower crane will vibrate greatly, so that the whole working process is not stable, and it also makes the tower crane driver emotional. Nervous, increasing unsafe factors during use

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