Control system and method for closed-bucket hoisting of four-rope grab crane

Abstract

The invention provides a bucket closing lifting control system of a four-rope grab bucket crane. The bucket closing lifting control system of the four-rope grab bucket crane comprises a main control unit, an on / off frequency converter and a support machine frequency converter, wherein the main control unit comprises a speed control subunit and a torque obtaining subunit; the speed control subunit is used for inputting an operation frequency instruction into the on / off frequency converter so that the on / off frequency converter to conduct the operation frequency instruction and to drive an on / off motor to operate; the torque obtaining subunit is used for obtaining an output torque of the opening and closing machine frequency converter, outputting the output torque of the opening and closing machine frequency converter to the support machine frequency converter and enabling the output torque of the support machine frequency converter to drive the motor to operate. The invention also provides a corresponding method. According to the bucket closing lifting control system and method of the four-rope grab bucket crane, the support machine frequency converter operates along with the torque of the on / off frequency converter, so that the support machine frequency converter is capable of quickly and automatically adjusting output frequency, thus dynamic balance of the grab bucket state can be reached and the application efficiency of the grab bucket can be improved.

Description

technical field [0001] The invention relates to the field of crane control, more specifically, to a closed-bucket lifting control system and method for a four-rope grab bucket crane. Background technique [0002] The four-rope grab crane is controlled by two frequency converters, one of which controls the opening and closing of the grab mechanism, that is, the opening and closing machine frequency converter 12; the other frequency converter controls the lifting and lowering of the grab mechanism, That is, the frequency converter 13 of the supporting machine. Two frequency converters respectively drive two motors (i.e. switching motor 14 and supporting motor 15), and incremental encoders 16 and 17 are respectively installed on each motor shaft, so as to feed back the state of the motor through the encoder pulse number to the corresponding motor. The frequency converter, so that the frequency converter can calculate the current switch state of the grab according to the pulse ...

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide a closed-bucket lifting control system and method for a four-rope grab crane in view of the problems of low precision and low efficiency in the scheme of adjusting the speed difference of the above-mentioned grab system

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