Super-lifting winch control method and system for crane

Abstract

The invention discloses a super-lifting winch control system for a crane. The crane comprises a telescopic main arm, which is in connection with a super-lifting arm. The control system comprises: a detection device, which is in connection with the main arm and the super-lifting arm, and is used for detecting an included angle of the super-lifting arm and the main arm and acquiring the main arm length and the main arm telescopic speed; a controller, which is in connection with the detection device, and is used for acquiring a current value required by a proportional electromagnetic valve for controlling winch flow at the same time of winch contract and release and main arm stretching and contraction according to the included angle, the main arm length and the main arm telescopic speed, and sending an instruction of outputting the winch flow according to the required current value; and an output device, which is in connection with the controller and is used for receiving and outputting the instruction of the controller. The control system can make the steel wire rope contraction and release speed by winch adapt to stretching and contraction of the main arm, so that the steel wire rope and the main arm can achieve synchronous motion. The invention also discloses a super-lifting winch control method corresponding to the system, and the method can reach the same effect.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a method and system for super-lift hoisting control of a crane. Background technique [0002] As construction sites have higher and higher requirements for the total arm length, lifting height and lifting weight of telescopic boom cranes, commonly used telescopic boom cranes (such as wheeled telescopic boom cranes) are developing in the direction of large-scale, large-scale Minimization is an important design goal of telescopic boom cranes. [0003] The total length of the main boom of the existing large-scale telescopic boom cranes is longer (usually greater than 50 meters). The longer (usually up to 20 meters to 70 meters). In addition, the self-weight of the main boom and the auxiliary boom is also increasing. On a large crane, the weight of the boom often accounts for more than 23% of the weight of the whole machine. However, the increase in the length and we...

AI Technical Summary

Problems solved by technology

[0005] First, if figure 2 As shown, when the main arm 100' is stretched, the speed of the super-lift winch 202' is slower than that of the main arm 100', or when the main arm 100' is retracted, the speed of the super-lift winch 202' is faster than that of the main arm 100', and the speed of the super-lift winch 202' will appear faster Lifting the wire rope 2021' to tighten the main arm 100', causing the bending of the main arm 100', which affects the speed of the telescopic main arm 100' and brings potential safety hazards

[0006] Second, if image 3 As shown, when the main arm 100' is extended, the speed of the super-lifting winch 202' is faster than that of the main arm 100', or when the main arm 100' is retracted, the speed of the super-lifting winch 202' is slower than that of the main arm 100'. There are problems such as excessive margin and sagging of the steel wire rope 2021'

However, since the telescoping speed of the main arm 100' is infinitely adjustable, and the hoisting speed is manually selected from a fixed gear, the operation is very cumbersome, and the gear of the hoisting speed cannot be matched with the speed of the main arm 100' in real time. Unable to guarantee the synchronization of the main boom 100' stretching and winch retraction

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