Lifting Arm Safety Control With Redundant Toppling Cross-Check
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Solution Overview
Problem
Existing lifting arm machines lack robust and redundant systems for monitoring and preventing toppling moments, which can lead to instability and potential accidents, especially when lifting payloads beyond the machine's rated capacity.
Innovation Solution
A safety control unit with two independent processors within a single housing unit monitors toppling moments using redundant sensor modules, cross-checks their values, and outputs safety commands to prevent toppling by adjusting the lifting arm's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single processor is used to monitor toppling moment, then the device complexity is reduced, but the reliability of toppling moment monitoring is insufficient
Solution Approach 1:
The monitoring system is segmented into two independent processors (first processor and second processor) that independently calculate toppling moments from the same sensor input. This segmentation provides redundancy and cross-validation capability, resolving the contradiction by improving reliability through independent verification while maintaining relatively simple device architecture.
Solution Approach 2:
The system creates a copy of the processing function by implementing two independent processors that perform identical calculations on the same sensor data. This copying approach enables cross-checking of results to ensure accuracy and detect failures, improving reliability without significantly increasing overall system complexity.
2Reliability
If redundant sensor modules are used to monitor toppling moment, then the reliability of monitoring is improved, but the device complexity increases
Solution Approach 1:
The single sensor input serves multiple functions by providing data to both the first processor and the second processor simultaneously. This multi-functionality approach allows one sensor to support redundant processing paths, improving reliability while avoiding the complexity of duplicating the entire sensor system.
Solution Approach 2:
The system merges the output of two independent processing paths into a single monitoring system that can cross-validate results. By combining the computational redundancy rather than sensor redundancy, the system achieves reliable monitoring with reduced overall complexity compared to having completely separate sensor and processing chains.
3Measurement precision
If cross-checking between processors is implemented, then the measurement precision of toppling moment is improved, but the device complexity increases
Solution Approach 1:
The second processor receives the first toppling moment calculation as input and performs cross-checking by comparing it with its own independent calculation. This feedback loop enables continuous validation of measurement precision through comparison, detecting discrepancies that indicate sensor drift or calculation errors without requiring complex additional verification systems.
Data Source
AI summary
A safety control unit for controlling a lifting arm of a lifting arm machine is provided. The safety control unit comprises a safety control unit housing, a sensor input, a first processor and a second processor. The sensor input is configured to receive a first signal indicative of a toppling moment of the lifting arm about the lifting arm machine and a second signal indicative of the toppling moment of the lifting arm about the lifting arm machine, wherein the first and second signals are independent of each other. The first processor is provided within the safety control unit housing and configured: to receive the first signal, to determine a first toppling moment based on the first signal, and to output the first toppling moment. The second processor is independent of the first processor and provided within the safety control unit housing. The second processor is configured: to receive the second signal, to determine a second toppling moment based on the second signal, to receive the first toppling moment from the first processor, and to cross-check that first toppling moment and the second toppling moment are within a predetermined range of each other. Further, the safety control unit is configured: to determine whether the first toppling moment and the second toppling moment exceed a predetermined threshold, and to output a toppling safety command signal if the safety control unit determines the predetermined threshold or the predetermined range is exceeded. A display unit and a lifting arm safety system, each comprising the safety control unit is also provided.