Tower crane lifting dead-slow control system and method

Abstract

The invention discloses a tower crane lifting dead-slow control system and a tower crane lifting dead-slow control method. The tower crane lifting dead-slow control system comprises a control device;the control device is connected with a display device for providing a human-machine interaction interface and displaying information such as a tower crane working mode, an operation parameter, parameter setting and alarm; a lifting variable-frequency driving system for executing a control device lifting command is connected; dead-slow control and millimeter precision can be achieved through the steps of mode selection, lifting signal generation and lifting execution; the working condition of high-precision lifting requirement can be met; itching control is not limited by the level of an operator, so that misoperation is effectively avoided and safety and reliability are achieved; various dead-slow control distances can be selected, so that different lifting precision requirements can be met; and the human-machine interaction interface is convenient and dead-slow control selection can be realized through one key.

Description

Technical field [0001] The invention relates to a tower crane micro-movement distance control system, which belongs to the field of engineering machinery, in particular to a tower crane lifting micro-speed control system and method. Background technique [0002] With the development of the construction industry, the birth and promotion of construction methods such as new prefabricated parts, prefabricated concrete structure construction, industrialized housing technology, etc., to the tower crane's hoisting accuracy, hoisting stability and super large and extra heavy equipment slow installation and precise installation All put forward higher requirements. [0003] In the prior art, the hoisting frequency conversion tower crane generally adopts five-gear lifting control, that is, there are 5 gears (5 operating speeds) for ascending and descending respectively. The first gear has the lowest speed and the fifth gear has the highest speed. The lifting operation command is input to the...

AI Technical Summary

Problems solved by technology

Its lifting control mode is continuous operation mode, that is, the handle does not return to the neutral position, and the system always controls the hook to run at the current speed, which is very unfavorable for operations that require precise positioning

Therefore, there will be the following technical shortcomings: 1. The lack of micro-speed control working mode, which cannot meet the requirements for the hoisting accuracy of the tower crane under the rapid development of prefabricated buildings; Under high speed, it is difficult to judge the running time and running distance manually, and it is easy to cause hoisting quality accidents; 3. The control method uses a large number of relays, contactors and hard-wired connections, and there are many fault points. When a fault occurs, the hardware needs to be replaced, which affects the operation efficiency

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