Tower crane slewing transmission mechanism, slewing control device and tower crane

Abstract

The embodiment of the application discloses a rotating transmission mechanism of a tower crane, a rotating control device and the tower crane. The rotating transmission mechanism comprises an active transmission component, a passive transmission component and a magnetic coupling strength adjusting device, wherein the active transmission component is connected with an output shaft of a rotating driving device and used for rotating after being driven by the rotating driving device; the passive transmission component is connected with an input shaft of a rotating speed reducer, magnetically coupled with the active transmission component, and used for transferring kinetic energy output by the active transmission component to the rotating speed reducer through magnetic coupling; and the magnetic coupling strength adjusting device is connected with the active transmission component or the passive transmission component and used for adjusting coupling strength between the active transmissioncomponent and the passive transmission component so as to control the rotating speed of a crane jig of the tower crane driven by the rotating speed reducer. The rotating speed of the crane jig can bebetter controlled, elastic accumulative energy on a crane body and / or the crane jig is released in the rotating process, and the running stability of the rotating transmission mechanism of the tower crane is improved.

Description

technical field [0001] The application relates to tower crane control technology, in particular to a tower crane slewing transmission mechanism, a slewing control device and a tower crane. Background technique [0002] Tower cranes (ie, tower cranes) are large-scale operating equipment on construction sites, which are mainly used to vertically transport building materials in high-rise construction. With the continuous development of the construction industry, there are more and more high-rise buildings, and the amount of tower cranes is also increasing. The working performance of the three major working mechanisms (hoisting mechanism, slewing mechanism and luffing mechanism) of the tower crane directly affects the working efficiency, safety and reliability of the tower crane. [0003] The control of the slewing mechanism is a complex and difficult part in the control of the entire tower crane. The slewing mechanism of the tower crane starts and brakes frequently, and it nee...

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Problems solved by technology

[0005] 1. The wire-wound motor is controlled by a hydraulic coupling. Due to poor control accuracy and low reliability, the output shaft of the reducer is often broken, which increases the maintenance cost;

[0006] 2. Slip motor control (OMD), because the basic speed control unit is electromagnetic coupling plus eddy current brake combination control to achieve the purpose, it belongs to slip speed control, high energy consumption, and the speed control unit has high working temperature and serious heat generation , high failure rate, resulting in low reliability and high maintenance costs;

[0007] 3. Torque motor voltage regulation plus eddy current control (RCV). The torque motor uses the method of reducing the electric torque and eddy current brake to decelerate and position. Electrical control parts are easily damaged;

[0008] 4. Frequency conversion control, although stepless speed setting can be realized within the speed regulation range, and the speed control accuracy is high, but due to the elastic deformation of the tower body, the elastic deformation of the boom, the large moment of inertia of the boom, and the large reduction ratio of the transmission system reducer and the There are intermittent reasons in the transmission link, and the application of frequency conversion technology is also unsatisfactory. The most prominent is that it is prone to vibration when the rotation is in the braking state.

In response to this defect, the system damping is generally increased by introducing an eddy current brake, and the slewing mechanism is jointly controlled with the frequency converter, but there is still a difficult coordination of the control relationship, motion jitter will still occur if there is a slight carelessness, and the cost of the frequency converter is high

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