Crane Control System Speed Reduction Strategy
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Solution Overview
Problem
Current crane operation methods result in abrupt parameter changes leading to load swinging and excessive stress on drive and steel components due to abrupt stopping, which is not effectively managed by existing technologies.
Innovation Solution
A method where the speed of parameter change is reduced continuously or step-wise before reaching the safe working load, preventing abrupt stops and minimizing stress on crane components by gradually adjusting the crane's movement speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If abrupt stopping is used to prevent exceeding safe working load, then the safe working load limit is maintained, but load swinging increases and drive components experience substantial loads
Solution Approach 1:
The control system detects the approaching safe working load limit in advance and initiates speed reduction before the limit is reached. This preliminary action allows the crane to smoothly approach the limit without abrupt stopping, thereby maintaining reliability while preventing load swinging and component stress.
Solution Approach 2:
The system dynamically adjusts the speed of parameter change based on the proximity to the safe working load limit. By continuously monitoring the working load and modifying the rate of parameter change, the system achieves smooth deceleration that maintains safety while eliminating the harmful effects of abrupt stopping.
2Object-affected harmful factors
If parameter change speed is reduced continuously or step-wise, then load swinging is prevented and component strain is reduced, but the operation time increases
Solution Approach 1:
The system applies speed reduction only partially - specifically when approaching the safe working load limit - rather than reducing speed throughout the entire operation. This selective application of speed reduction minimizes the time loss while still preventing load swinging and component strain when necessary.
Solution Approach 2:
The system changes the parameter of speed dynamically based on the working load conditions. By adjusting the speed parameter only when needed (when approaching the safety limit), the system achieves the beneficial effects of reduced load swinging and component strain without unnecessarily extending the overall operation time.
Data Source
AI summary
The present disclosure relates to a method of operating a crane whose safe working load depends on one or more changeable parameters, with the change of at least one of the parameters being made such that the speed of the parameter change is reduced continuously or step-wise before a parameter value is reached at which the safe working load corresponds to the actual working load.