Method for controlling torque of heavy-duty crane at zero speed

Abstract

The invention provides a method for controlling torque of a heavy-duty crane at zero speed, belonging to the technical field of crane manufacturing. The method is based on the condition that the heavy-duty crane is at low rotating speed or zero rotating speed. The method detects the torque and rotating speed of a load motor in real time, high torque is output to the motor at low speed or zero speed, and the method comprises a rapid zero-crossing torque control method, a high torque output control method and a brake sequence control method. The method can solve the problem of insufficient moment for starting a drive system and avoid zero hook gliding from occurring.

Description

technical field [0001] The invention belongs to the technical field of crane manufacturing, and in particular relates to a zero-speed torque control method of a heavy crane. Background technique [0002] Heavy-duty cranes are the equipment with the highest safety requirements in the crane industry. Among them, the lifting mechanism is the most critical system in the entire system structure, with high technical requirements and high safety requirements. [0003] For the hoisting mechanism of heavy cranes, preventing the hook from slipping is very important and the most critical requirement. To achieve this is required to do (1) The drive system should have a large starting torque, usually exceeding 150% of the rated torque , If factors such as overload experiments are considered, at least 200% of the rated torque should be provided during the starting acceleration process, (2) due to the existence of mechanical brakes. It is necessary to make the output torque of the drive s...

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Problems solved by technology

But this will cause a great impact on the motor and the braking system, which will greatly affect the service life of the machine on the one hand, and on the other hand will often overload the drive system

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