Swing mechanism control system for tower crane

Abstract

The invention provides a swing mechanism control system for a tower crane, comprising a motor system, a driving system and a communication system. The motor system comprises two motors, two brake controllers and two breakers, wherein one end of each breaker is connected with the driving system through three power lines, and the other end is connected with each motor; one end of each brake controller is connected with the output end of the communication system through two brake communication lines, and the other end is connected with each motor through a power line. The driving system comprises a vector control module and an anti-swing control module, wherein the vector control module drives and brakes the motors by adopting a vector control mode. In the invention, uniform acceleration can be realized in the process of starting and stopping, anti-swinging control and location control can be achieved, and adjustable control of the motor in the process from operating to stopping can be realized. The invention avoids the shaking of the tower body caused by sudden releasing of stress to the maximum and has the advantages of safety, convenience, energy saving, environment protection, little noise and convenient use.

Description

technical field [0001] The invention belongs to the technical field of crane manufacturing, and in particular relates to a control system for a slewing mechanism of a tower crane. Background technique [0002] The slewing mechanism of the tower crane is a transmission device that provides power for the slewing of the tower crane. The device is generally composed of a motor with a brake, a planetary reducer, a pinion, a slewing limiter, etc. The overall weight of the upper part ranges from dozens of tons to hundreds of tons, and the length of the boom is more than 60 meters. Generally, it is required to reach full speed in about ten seconds and stop stably in about 12 seconds. . When stopping during operation, although the slewing motor loses power and stops running, the forearm and rear arm of the tower crane still continue to decelerate and slew under the action of huge slewing inertia, causing the hanging object to slide past the destination in a short time and cannot fal...

AI Technical Summary

Problems solved by technology

The above control methods have the following deficiencies: (1) The output shaft of the reduction box is often broken, which seriously affects the normal operation of the equipment and increases the maintenance cost and number of repairs; (2) The start is seriously unstable, and the impact on the tower Large, which seriously threatens the operation safety of the steel structure and reduces the service life of the equipment itself; (3) The tower body twists seriously when parking, and occasionally shakes, which makes the tower crane driver obviously feel that the operation is not stable; (4) Electrical control parts It is easy to be damaged, and the cost of accessories is high; (5) The torsional impact of the whole machine is large, and the boom slides for a long time after the motor is powered off, making it difficult to position, and the rotary reducer is easily damaged

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