Crane Hook Load Weighing via Adjustable Lever Pin
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Solution Overview
Problem
Existing crane load weighing systems face challenges in achieving accurate measurements across a wide range of weights due to the limited measurement range of sensors, which results in less accurate values for both large and small loads.
Innovation Solution
An apparatus with a measurement device and retaining pin positioned at multiple locations between the crane boom and hook, allowing for adjustable lever relationships to adapt the measurement range to the applied load, enabling precise load weighing by varying the measurement accuracy based on the load weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single measurement device with fixed measurement range is used, then the device complexity is reduced, but the measurement precision deteriorates for both large and small weights
Solution Approach 1:
The patent implements a dynamic measurement system where the retaining pin can be repositioned between multiple positions (first position for large loads, second position for small loads). This dynamic reconfiguration allows the measurement device to adapt its effective measurement range based on the actual load magnitude, thereby maintaining high measurement precision across the entire weight range without requiring multiple fixed measurement devices.
Solution Approach 2:
The patent changes the geometric parameters of the measurement system by repositioning the retaining pin along the boom. By altering the position parameter, the lever arm length changes, which directly affects the measurement sensitivity and range. This parameter change enables a single measurement device to accurately measure both large and small loads by adjusting its effective measurement scale.
2Quantity of substance
If the measurement device is positioned to measure large weights, then the measurement range is extended, but the measurement precision for small weights deteriorates
Solution Approach 1:
The system dynamically adjusts the retaining pin position based on the magnitude of the load. For small weights, the retaining pin is positioned in the second position (closer to the measurement device) to increase measurement sensitivity and precision. For large weights, it is positioned in the first position (farther from the measurement device) to extend the measurement range. This dynamic positioning resolves the contradiction between measurement range and precision for different weight magnitudes.
3Measurement precision
If the measurement device is positioned to measure small weights with high precision, then the measurement precision is improved, but the measurement range for large weights is reduced
Solution Approach 1:
The patent employs a dynamic repositioning mechanism that allows the retaining pin to switch between two positions. When measuring small weights, the pin is placed in the second position to maximize measurement precision. When measuring large weights, the pin is relocated to the first position to expand the measurement range. This dynamic adaptation eliminates the need to choose between precision and range, as both are optimized for their respective load conditions.
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 allows for exact determination of the crane load, optimizing the utilization of the maximum permitted payload and providing flexible measurement accuracy across different weight ranges using the same measurement device, ensuring accurate load weighing regardless of load size.
Implementation Method 1
The measurement device detects or measures tensile forces and/or compressive forces
Implementation Method 2
the forces transmitted by the retaining pin in the two positions can be differently divided via corresponding lever relationships
Data Source
AI summary
The invention relates to an apparatus for weighing the hook load of a crane, wherein different measurement accuracies can be set at the apparatus, comprising at least one measurement device, at least one retaining pin, and at least one coupling section. The invention is additionally directed to a hook block and to a crane having a corresponding apparatus.