Safety System for Telescopic Handler Boom Instability
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Solution Overview
Problem
Existing telescopic handlers rely on systems for limiting longitudinal moment to prevent instability and overturning, which may not effectively address structural safety and stability under varying load conditions.
Innovation Solution
A safety system for self-propelled working machines, including telescopic handlers, that utilizes a processing unit to detect load position and weight, compares these against variable reference values, and limits boom movement to prevent aggravating positions that could lead to instability or structural yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing longitudinal moment limiting systems are used, then overturning risk is reduced, but structural safety and stability under varying load conditions are not effectively addressed
Solution Approach 1:
The system dynamically adjusts safety parameters based on real-time load detection. The processing unit continuously monitors load weight and position, and automatically modifies the permissible longitudinal moment threshold and boom movement limitations accordingly. This dynamic adaptation allows the system to maintain structural safety while optimizing performance across varying load conditions.
Solution Approach 2:
The invention changes the operational parameters of the boom system based on detected load conditions. The processing unit modifies parameters such as maximum permissible longitudinal moment, allowed boom angle ranges, and movement speed limits according to the detected load weight and position, thereby optimizing both safety and adaptability.
2Reliability
If boom movement is limited to prevent aggravating positions, then instability risk is reduced, but operational flexibility is reduced
Solution Approach 1:
The system implements continuous feedback control by monitoring boom position, load weight, and calculated longitudinal moment in real-time. The processing unit compares current operating parameters against safety thresholds and automatically adjusts boom movement limitations only when necessary, allowing full operational flexibility under safe conditions while preventing instability when risks are detected.
Solution Approach 2:
The boom movement limitations are dynamically adjusted based on real-time load conditions and calculated longitudinal moment. The system transitions between restrictive and permissive states automatically, maintaining operational flexibility when safe and providing protection only when needed, thus resolving the contradiction between stability and operational flexibility.
3Reliability
If variable reference values are used for load comparison, then safety under varying conditions is improved, but system complexity increases
Solution Approach 1:
The processing unit automatically performs the complex calculations and comparisons required for safety assessment without external intervention. The system self-adjusts by continuously monitoring load parameters, calculating longitudinal moment, and automatically determining appropriate safety thresholds based on detected conditions, thereby managing its own complexity internally.
Solution Approach 2:
The system replaces complex mechanical safety mechanisms with an electronic control system that uses sensors, processing units, and software algorithms. This substitution manages complexity through computational methods rather than mechanical complexity, using digital processing to handle variable reference values and safety assessments.
Data Source
AI summary
Described is self-propelled working machine (1) provided with organ (10) for moving a load and equipped with a safety system designed to prevent a risk of instability and comprising means (3) for detecting a position and a weight of the load and further comprising a processing unit (2) connected to said detection means (3) and in turn comprising: a checking module (21) configured for comparing the weight of the load with a reference value, selected on the basis of a position of the load; and a limiting module (22) configured for producing a limiting signal suitable for limiting the movement of the movement organ (10), following the comparison performed by the checking module. The reference value is independent of an angular position of the movement organ (10).