Method for stably controlling rotating mechanism of tower crane

A technology for tower cranes and slewing mechanisms, applied in cranes, load hanging elements, transportation and packaging, etc., can solve problems such as unreliability

Active Publication Date: 2020-07-07
WUHAN GUIDE ELECTRIC DRIVE TECH CO LTD
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Problems solved by technology

CN201210576592 discloses a method that needs to install an acceleration sensor at the end of the tower arm to measure the acceleration and speed of the end of the tower arm, and then control the motor on the slewing drive side to follow the state of the end of the...

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  • Method for stably controlling rotating mechanism of tower crane
  • Method for stably controlling rotating mechanism of tower crane
  • Method for stably controlling rotating mechanism of tower crane

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] Driven by a frequency converter, an ordinary variable frequency motor has the ability to output constant torque within the range from zero speed to rated speed when vector control is used, that is, it can output less than the maximum speed within the range from zero speed to rated speed. In other words, the ordinary variable frequency motor at this time can be regarded as a controllable torque generator. When the controllable torque generator can simulate the mechanical characteristics of the torque motor plus the eddy current brake, the ordinary variable frequency motor can control the slewing mechanism of the tower crane to achieve the control effect of RCV.

[0035] Depend on figure 1 As shown, what dashed line frame 2 represents is the concrete content of the present invention, and gear position signal generator 1 produces the gear position ...

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Abstract

The invention discloses a method for stably controlling a rotating mechanism of a tower crane. A frequency converter controls a frequency conversion motor for controlling the tower crane, and a slopeconversion module generates a step speed command omega ref into a speed command omega cmd which changes according to a preset slope; a torque motor torque function generation module generates a firsttorque command Tcmd1 by using a torque motor torque function; an eddy current brake torque function generation module generates a second torque command Tcmd2 by utilizing an eddy current brake torquefunction; a torque synthesis module receives the first torque command Tcmd1, the second torque command Tcmd2 and a rotation speed direction signal input by a rotation speed direction judgment module to generate a torque synthesis command Tcmd3; and the torque synthesis command Tcmd3 is used as a torque control loop of the frequency converter to drive the frequency conversion motor of the tower crane. According to the method, the rotating mechanism of the tower crane can be started, the braking is stable, the integral acceleration and deceleration time is short, and the working efficiency is high.

Description

technical field [0001] The invention belongs to a control method applied to the slewing mechanism of a crane, in particular to a method for stably controlling the slewing mechanism of a tower crane. Background technique [0002] The characteristics of the overall system of the slewing mechanism of the tower crane are that the boom is long, the weight is large, and the inertia is also large. , the flexibility of the tower body will also bring additional difficulty to the control of the slewing mechanism. [0003] At present, there are several mainstream methods for controlling the slewing mechanism of tower cranes, each of which has advantages and disadvantages in terms of control effect, reliability and cost. The first is that the motor adopts a torque motor with an eddy current brake, and the controller adopts an RCV control mode of the AC voltage regulation type, as disclosed in CN201512374U and CN200910013251. The advantage of this control mode is that the control effect...

Claims

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Application Information

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IPC IPC(8): B66C13/22B66C23/84
CPCB66C13/22B66C23/84
Inventor 谢鸣李小松曾国庆王俊
Owner WUHAN GUIDE ELECTRIC DRIVE TECH CO LTD
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