Magnetostrictive Position Sensors for Mobile Crane Stability
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Solution Overview
Problem
Mobile working machines, such as cranes and self-propelled concrete mixers, face instability issues due to restricted outrigger extension in challenging environments, leading to reduced operating parameters and potential tipping, as existing sensors face limitations in material compatibility and environmental conditions.
Innovation Solution
A control system that limits operating parameters based on sensor feedback from position and angle sensors, preventing instability by automatically adjusting outrigger lengths and pivot angles, and includes redundant checks with pressure and inclination sensors to ensure safe operation, using magneto-sensitive position sensors and wireless signal transmission for reliable monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If outriggers are extended to full length to improve stability and operating parameters, then machine stability improves, but in restricted environments the outriggers cannot be extended fully and can only reach intermediary positions which reduce operating parameters
Solution Approach 1:
The patent implements continuous monitoring of outrigger extension length through optical distance measuring systems and intermediary position detection through sensors. This feedback mechanism allows the control system to automatically adjust operating parameters based on the actual outrigger position, ensuring machine stability is maintained even when outriggers cannot be extended to full length due to environmental restrictions.
2Measurement precision
If inductive or magnetic induction sensors are used to detect outrigger position, then position detection is achieved, but material choice in the environment of the sensor is limited
Solution Approach 1:
The patent replaces inductive or magnetic induction sensors with optical distance measuring systems. This substitution eliminates the material compatibility limitations associated with magnetic fields, allowing the use of ferromagnetic materials in the outrigger structure without interfering with sensor operation. The optical system provides the same position detection functionality while offering greater material selection flexibility.
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
The system ensures stable operation by preventing parameter exceedance, emitting warnings, and automatically adjusting outrigger loads to maintain stability, enhancing safety and operational efficiency even in restricted conditions.
Implementation Method 1
position sensors in the telescoping lateral outriggers which continuously monitor the extension length
Data Source
AI summary
In lateral outriggers, e.g. of a mobile crane touch-free position sensors are arranged for the extension length and the operating range of the mobile crane is limited as a function of the currently measured values. In particular the touch-free magnetostrictive position sensors in a very flat housing can be well arranged between the particular telescope profiles without being exposed to the risk of damages.