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Tower crane hoisting and speed control system and speed control method thereof

A control system and technology for tower cranes, applied in the field of tower crane hoisting speed regulation control and tower crane hoisting speed regulation control system, can solve the problems that the system efficiency cannot be significantly improved, the motor power cannot be fully utilized, and can avoid unpredictability. stability, improve efficiency, and ensure the effect of stability

Active Publication Date: 2013-04-17
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a tower crane hoisting speed regulation control system, which solves the problem that the prior art does not fully utilize the power of the motor and cannot significantly improve the system efficiency

Method used

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  • Tower crane hoisting and speed control system and speed control method thereof
  • Tower crane hoisting and speed control system and speed control method thereof
  • Tower crane hoisting and speed control system and speed control method thereof

Examples

Experimental program
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Effect test

Embodiment

[0040] refer to figure 2 , Take the hoisting speed regulation of a 16-ton tower crane as an example, PLC1 uses Mitsubishi PLC, and frequency converter 3 uses Yaskawa frequency converter. The tower crane hoisting control system configuration is as follows:

[0041]

[0042]

[0043] The setting frequency of the tower crane hoisting 5-speed inverter is: 5Hz, 15Hz, 45Hz, 80Hz, 110Hz; corresponding to the above-mentioned hoisting mechanism, the hoisting line speed under the tower crane 2 rope is as follows:

[0044] Gear frequency (Hz)

5

15

45

80

110

2 Rope speed (m / min)

3.9

11.7

35.1

62.4

85.8

[0045] According to the characteristics of the motor, the current hoisting weight Q≤4.8 tons, the system can run at 110Hz;

[0046] The current hoisting weight is 4.8 tons ≤ Q ≤ 8 tons, and the system can run between 80Hz and 110Hz;

[0047] For ordinary hierarchical control, when the current hoisting weight Q≤6 tons...

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Abstract

The invention discloses a tower crane hoisting and speed control system which comprises a PLC (Programmable Logic Controller); the PLC is respectively connected with an operation handle, a frequency converter and a hoisting sensor simultaneously; the frequency converter is connected with a motor and a speed measurement encoder to form a closed loop; the motor is connected with a winding drum through a reduction gearbox; and the hoisting sensor is used for detecting the hoisting weight through detecting the tensile force of a steel rope. The invention also discloses a tower crane hoisting and speed regulation control method; the PLC is adopted for controlling the speed regulation of the frequency converter to realize the gear separation and stepless speed regulation combination; during the working process, the PLC obtains a handle signal and a hoisting signal in real time and also obtains the current of the motor through a 485 bus; and a hoisting speed control mode is determined according to the state of the system. The device and the method have the beneficial effects that the practical running speed of the tower crane is regulated under the maximum speed limit of all gears, the unpredictability of a driver for speed is avoided, the PLC is adopted for realizing the closed-loop control of the current, and the speed stability is ensured.

Description

technical field [0001] The invention belongs to the technical field of tower crane hoisting automatic control, and relates to a tower crane hoisting speed regulation control system, and also relates to a tower crane hoisting speed regulation control method. Background technique [0002] Tower cranes (also known as tower cranes) are the main means of transportation for building houses and bridges. The hoisting 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. Due to the high lifting power and fast running speed of the tower crane, the mechanical impact generated during the speed change process is relatively large. Therefore, the main requirements for tower crane hoisting speed regulation control are: start / stop operation and smooth speed regulation transition, no hook slip, wide speed regulation range, low speed for ...

Claims

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Application Information

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IPC IPC(8): B66C13/22
Inventor 杨静王新刚李伟
Owner XIAN UNIV OF TECH
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