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

A lifting mechanism, frequency conversion speed regulation technology, applied in cranes, load hanging components, transportation and packaging, etc. problems, to achieve the effect of easy process automation control, obvious power saving effect, and improved usage

Inactive Publication Date: 2016-03-09
CAS OF CHENGDU INFORMATION TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, the lifting mechanism of the tower crane is a transmission device that provides power for the hoisting behavior of the tower crane. The device is mainly composed of a motor, a gearbox, a reel, and a lifting control system. , the mechanical impact generated during the speed change process is relatively large. As far as the speed control technology of the tower crane lifting mechanism is concerned, the lifting mechanism mostly adopts motor pole-changing speed regulation and winding rotor motor series resistance speed regulation. These speed regulation methods cannot Smooth speed regulation is achieved, and the impact on the transmission mechanism is relatively large. Since the above speed regulation method is a full-power speed regulation, it will cause problems such as high energy consumption in equipment operation, reduced reliability, increased failure rate, increased maintenance cost, and difficult maintenance.
In order to overcome these problems, more advanced frequency conversion speed regulation technology is also used in the prior art, but the gear control method is mostly used for the speed regulation of the lifting motor, the gear frequency is set, and the frequency given by the gear is used to realize the step frequency conversion The effect, the speed between the gears is stepped, and the smooth stepless speed regulation of the lifting motor cannot be realized

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

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Embodiment Construction

[0030] A frequency conversion speed regulation control system for a tower crane lifting mechanism, such as figure 1 As shown, it includes: linkage table 1, limit signal acquisition device 2, PLC controller 3, frequency converter 4, speed measuring encoder 5, lifting motor 6, reducer 7, roller 8, etc.; where:

[0031] The limit signal acquisition device 2 and the frequency converter 4 are respectively connected with the PLC controller 3, and the linkage table 1, the frequency converter 4, the lifting motor 6 and the speed measuring encoder 5 form a control closed loop; the lifting motor 6, the reducer 7, and the drum 8 For the lifting mechanism.

[0032] The limit signal acquisition device 2 is a device used to collect the stroke of the tower crane mechanism operating state and the stroke limit switch signal of the limit limit protection during the operation of the tower crane equipment; its composition includes: a gear train with a coupling , cam group, travel switch; through...

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Abstract

The invention discloses a variable-frequency-speed-adjusting control system and method of a tower-crane lifting mechanism. The control system comprises a linkage table, a limiting signal collecting device, a PLC, a frequency converter and a speed measurement encoder, 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 a lifting motor of the lifting mechanism, and a control closed loop is formed by the linkage table, the frequency converter, the lifting motor and the speed measurement encoder. 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 lifting mechanism can be smoothly and stably increased to the maximum speed under controlling of a driver, the maximum speed of the tower-crane lifting 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 lifting mechanism. Background technique [0002] At present, the lifting mechanism of the tower crane is a transmission device that provides power for the hoisting behavior of the tower crane. The device is mainly composed of a motor, a gearbox, a reel, and a lifting control system. , the mechanical impact generated during the speed change process is relatively large. As far as the speed control technology of the tower crane lifting mechanism is concerned, the lifting mechanism mostly adopts motor pole-changing speed regulation and winding rotor motor series resistance speed regulation. These speed regulation methods cannot Smooth speed regulation is achieved, and the impact on the transmission mechanism is relatively large. Since the above speed regulation method is a full-power speed regulation, it will cause problems such as high ene...

Claims

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Application Information

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IPC IPC(8): B66C23/16B66C13/48
CPCB66C23/16B66C13/48
Inventor 钟勇向运洪张良周渭博张光源李迪
Owner CAS OF CHENGDU INFORMATION TECH
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