A synchronous control method and device for a double winch hoisting system of a crane

Abstract

The invention discloses a synchronous control method and device for a double winch hoisting system of a crane. The instrument is symmetrically fixed on both sides of the crane arm head; two distance measuring baffles are symmetrically fixed on both sides of the hook; the laser rangefinder is used to collect the distance between the two sides of the hook and the crane arm head; two rotary encoders are respectively Installed on the main shaft of the double hoist, it is used to measure the rotation angle of the two hoists; the controller is used to receive the distance signal output by the laser rangefinder and the angle signal of the rotary encoder, and calculate the distance signal to determine The validity of the distance signal, if the distance signal is valid, then maintain the synchronous control based on laser ranging feedback; otherwise, switch the control mode to synchronous control based on coded feedback; the method of the present invention is realized by the above-mentioned device, which can ensure Safe operation of crane work.

Description

technical field [0001] The invention belongs to the field of engineering machinery control calculations, in particular to a method and device for synchronous control of a double winch hoisting system of a crane. Background technique [0002] With the expansion of the application scenarios of cranes in engineering operations, the hoisting system of cranes is increasingly designed in the form of double winches and single hooks to improve the lifting capacity of the crane. In this way, it is necessary to ensure the synchronous action of the two hoisting systems, because if the two hoisting systems are not synchronized, the lengths of the two wire ropes will be inconsistent, which will cause the hook to tilt and the loads on the two wire ropes to be different, even when the hook is tilted. In serious cases, one of the hoisting systems will be overloaded, which will easily cause the wire rope on the overloaded side to break, and cause serious safety accidents. [0003] At presen...

AI Technical Summary

Problems solved by technology

In this way, it is necessary to ensure the synchronous action of the two hoisting systems, because if the two hoisting systems are not synchronized, the lengths of the two wire ropes will be inconsistent, which will cause the hook to tilt and the loads on the two wire ropes to be different, even when the hook is tilted. In severe cases, one of the hoisting systems will be overloaded, which will easily cause the wire rope on the overloaded side to break, which will lead to serious safety accidents

[0003] At present, crane manufacturers at home and abroad widely use the control method based on coded feedback to regulate the synchronization of the double winch system. Influenced by factors such as different rope stiffness and different friction conditions, the control accuracy of this control method based on coded feedback is not high, which is easy to cause error accumulation, and the problem of double winch synchronization has not been fundamentally solved.

Another widely recognized control strategy is the synchronous control method based on inclination feedback, that is, installing an inclination sensor on the crane hook to obtain the inclination value of the hook, and judging whether the hook is inclined by this inclination value, so as to control the double winch However, the inclination sensor in this method is installed on the hook, and the inclination signal is often transmitted by wireless transmission. At the same time, the battery is used to supply power to the inclination sensor, so it is necessary to check the battery power and replace it frequently. batteries, and this method does not reliably transmit the inclination signal in large cranes

Therefore, there are still many defects in the actual use of this synchronous control technology based on inclination feedback.

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