Free Fall Winch Torque Feedback Control
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Solution Overview
Problem
Free fall winches face challenges in maintaining stable operation due to fluctuations in lubricant temperature and viscosity, as well as changing coefficients of friction, which affect braking performance and require continuous readjustment, and they struggle with manual rope removal and overload protection.
Innovation Solution
A system that detects torques acting on the winch during free fall operation and adjusts the braking power accordingly, using a torque detection device and control module to maintain a desired braking torque, independent of lubricant conditions, and allows for manual rope removal by compensating for unwanted influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the free fall brake is used to control the drum during free fall operation, then the drum can be braked to avoid slack rope, but the braking performance deteriorates due to fluctuations in lubricant temperature and viscosity as well as changing coefficients of friction
Solution Approach 1:
The patent implements a feedback mechanism where a sensor detects the actual braking torque or drum speed, and this information is fed back to a control unit. The control unit compares the detected value with a reference value and adjusts the actuating force on the brake lining accordingly. This closed-loop feedback system compensates for changes in lubricant conditions and friction coefficients, maintaining stable braking performance throughout the free fall operation.
Solution Approach 2:
The patent employs dynamic adjustment of the brake actuating force during free fall operation. Instead of using a fixed braking force, the system continuously adapts the braking torque based on real-time detection of operational parameters. This dynamic control allows the brake to maintain optimal performance despite varying lubricant temperature, viscosity, and friction conditions.
2Reliability
If the free fall brake is applied cyclically to maintain braking performance, then stable operation is achieved, but continuous readjustment is required due to heating and changing friction coefficients
Solution Approach 1:
The patent implements a self-regulating braking system where the control unit automatically adjusts the brake actuating force based on feedback from sensors. The system monitors its own performance and makes necessary adjustments without requiring external intervention or manual readjustment. This self-service capability eliminates the need for continuous operator involvement while maintaining stable operation.
Solution Approach 2:
The feedback mechanism continuously monitors braking performance and automatically compensates for changes in friction coefficients and lubricant conditions. The control unit receives information about actual braking torque or drum speed and adjusts the actuating force accordingly, maintaining stable operation without requiring manual intervention.
3Ease of operation
If manual rope removal is attempted with cold lubricant having high viscosity, then frictional forces must be overcome, but hand operation becomes practically impossible
Solution Approach 1:
The patent replaces the purely mechanical manual rope removal operation with a controlled system that uses the winch drive itself to assist in rope pay-out. The control unit regulates the winch drive to provide controlled reverse rotation, overcoming the high frictional forces present in cold lubricant conditions. This substitution of manual mechanical effort with controlled mechanical assistance makes rope removal feasible under all lubricant temperature conditions.
4Ease of operation
If the winch drive assists manual rope removal, then frictional forces can be overcome, but the drive assistance level must be carefully controlled to avoid undesirably fast unreeling
Solution Approach 1:
The patent employs dynamic control of the winch drive during manual rope removal operations. The control unit continuously adjusts the drive assistance level based on feedback from sensors that monitor rope pay-out speed and drum rotation. This dynamic regulation ensures that the winch drive provides sufficient force to overcome frictional resistance while preventing excessively fast unreeling, adapting the assistance level to the actual operational conditions.
Solution Approach 2:
The feedback mechanism monitors the actual rope pay-out speed and drum rotation during assisted manual removal. The control unit compares this with desired parameters and adjusts the winch drive power accordingly, maintaining controlled speed while overcoming frictional forces. This closed-loop control prevents both insufficient assistance and excessively fast unreeling.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures stable free fall operation, simplifies manual rope removal, and provides overload protection by dynamically adjusting braking torque based on real-time torque measurements, reducing the need for continuous readjustment and improving operational reliability.
Implementation Method 1
a free fall brake (11) that can rotate in free fall operation
Implementation Method 2
fluctuations in lubricant temperature and viscosity
Data Source
AI summary
The invention relates to a free fall winch comprising a drum, which can be rotationally driven by a winch drive, wherein a free fall brake is provided for braking the drum in free fall operation. According to the invention, a torque acting on the free fall winch, which depends on the free fall braking torque, is detected by means of a detection device, and a brake actuation force with which the free fall brake is actuated is controlled or adjusted by a control device according to the detected torque.