Device and method for controlling slewing mechanism of tower crane

Abstract

The invention is applied to the technical field of electrical control, and provides a device and a method for controlling a slewing mechanism of a tower crane. The device for controlling the slewing mechanism of the tower crane is composed of a general frequency converter, an alternating-current brake circuit, a slewing motor, a direct-current brake circuit, a forward control circuit, a reversal control circuit, an intermediate-speed control circuit, a high-speed control circuit and a braking control circuit. At the moment of starting, the initial frequency of the general frequency converter is regulated and the speed reduction time is regulated when the output frequency of the general frequency converter is reduced, thus the torque of a tower body is released; under the control of the direct-current brake circuit, the swinging of a lifting arm and the torque of the tower body are released fully; meanwhile, the general frequency converter provides brake signals of the alternating-current brake circuit and brakes a slewing motor, and the lifting arm stops stably; and the comprehensive benefits of convenience in operation, long repairing and maintaining cycle and energy source conservation are realized by utilizing each function of the general frequency converter.

Description

technical field [0001] The invention belongs to the technical field of electrical control, and in particular relates to a device and method for controlling the slewing mechanism of a tower crane. Background technique [0002] At present, the control methods of the slewing mechanism commonly used in tower cranes are as follows: [0003] 1. Squirrel cage motor plus hydraulic coupler, wire wound motor plus hydraulic coupler. [0004] Advantages: simple circuit, mature technology. Disadvantages: The hydraulic coupling transmission system and the mechanical device of the slewing mechanism are complicated. When the slewing decelerates, the operator needs to frequently reverse the brakes to achieve a smooth deceleration. This mode requires skilled operators to operate to achieve smooth operation, which increases the labor intensity of the driver. At the same time, frequent anti-vehicle braking increases the frequency of damage to the slewing mechanism and increases the maintenan...

AI Technical Summary

Problems solved by technology

[0013] The object of the present invention is to provide a device and method for controlling the slewing mechanism of a tower crane. When turning at a small angle, the swing of the boom is more serious, and the positioning of the boom is difficult; the moment the boom stops, the tower body is prone to shake, which seriously threatens the operation safety of the tower crane.

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