Hydraulic Load Determination via Force and Geometry Detection
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Solution Overview
Problem
Existing methods for determining the load lifted or to be lifted by a hydraulic lifting apparatus are limited to specific predetermined positions and configurations, making them inflexible and unable to account for changes in the crane's configuration or wear and tear.
Innovation Solution
A method that involves detecting the forces and geometry of the hydraulic lifting apparatus in a reference position and a measurement position, allowing for load determination based on the current operating parameters, regardless of the crane's configuration or position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sampling phase with predetermined positions is used for load determination, then the load can be determined using sample diagrams, but the method becomes limited to specific configurations and positions
Solution Approach 1:
The system transitions from static sample diagrams recorded at predetermined positions to dynamic real-time measurements of forces and geometries. The controller continuously detects current operating parameters (forces in hydraulic cylinders, arm positions, angles) and calculates loads based on the actual current configuration, enabling adaptation to any crane position and configuration change.
Solution Approach 2:
The method changes from using fixed pre-recorded parameter sets (sample diagrams) to continuously varying parameters detected in real-time. The system measures current forces in hydraulic cylinders and current geometries (arm positions, angles) and uses these changing parameters to calculate load, thereby adapting to wear, configuration changes, and different operating positions.
2Measurement precision
If sample diagrams are recorded by the crane manufacturer for load determination, then load can be determined in the original configuration, but the sample diagrams cannot be utilized after configuration changes
Solution Approach 1:
The crane performs its own self-calibration and self-measurement through the reference phase and measurement phase. Instead of relying on manufacturer-recorded sample diagrams, the system autonomously detects current forces and geometries, calculates loads, and adapts to its actual state, including wear and configuration changes, ensuring continuous reliable operation.
3Measurement precision
If the crane must be moved to predetermined positions for load determination, then sample diagrams can be used, but time is lost moving the crane to specific positions
Solution Approach 1:
The system enables continuous load determination at any crane position without requiring movement to predetermined sampling positions. Load measurement becomes an ongoing process integrated into normal operation, eliminating the need to pause and reposition the crane for load determination.
4Productivity
If load determination is based on pressure measurements in the main cylinder, then the load can be calculated, but the method cannot account for changes in crane configuration or wear
Solution Approach 1:
The system incorporates feedback from multiple sensors including force sensors in hydraulic cylinders, position sensors on crane arms, and angle sensors. This multi-parameter feedback enables the controller to continuously update load calculations based on actual current conditions, compensating for wear and configuration changes while maintaining fast determination speed.
Data Source
AI summary
In a method for determining a load that is lifted or to be lifted by a hydraulic lifting device, for the determining the load lifted or to be lifted, in a reference phase, the lifting device is moved into a reference position in a first loading state of the lifting device. A first detection of the forces currently acting on the lifting device and the current geometry of the lifting device occurs in the reference position. In a measurement phase, the lifting device is moved into a measurement position in a second loading state, and a second detection of the forces currently acting on the lifting device and the current geometry of the lifting device occurs in the measurement position. In a comparison phase, the lifted load is characterized by a comparison of the respective detected forces currently acting on the lifting device and the respective detected current geometry of the lifting device.