Hydraulic Cylinder Position Sensing for Working Tool Swing Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing working machines lack accurate detection and control mechanisms for the swing position of working tools, leading to inefficiencies in operations such as scooping and dumping.
Innovation Solution
A detection device is integrated into the working machine, comprising a detected object on the cylinder tube and a detector on the piston rod, which uses proximity sensors to detect the telescopic movement of the working tool cylinder, allowing for precise determination of the swing position and direction of the working tool based on unique detection patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a detection device is added to detect the telescopic movement state of the cylinder, then the measurement precision of the swing position is improved, but the device complexity increases
Solution Approach 1:
The detector is mounted on the piston rod, which is already nested within the cylinder assembly. This utilizes the existing hierarchical structure of the hydraulic cylinder (cylinder tube containing piston rod) to accommodate the detection device without adding external components, thereby improving measurement precision while minimizing device complexity
Solution Approach 2:
The detection device utilizes the existing telescopic movement of the piston rod relative to the cylinder tube to perform both its mounting function and detection function. The piston rod's own movement serves as the detection mechanism, eliminating the need for separate actuation systems and reducing overall device complexity while maintaining high measurement precision
2Measurement precision
If the detector is mounted on the piston rod to detect the telescopic movement, then the measurement precision is improved, but the ease of manufacture deteriorates due to additional assembly steps
Solution Approach 1:
The detector mounting is merged with the existing piston rod-cylinder tube assembly. The detector becomes an integrated component of the hydraulic cylinder system rather than a separate addition, allowing manufacturers to assemble the detection system in conjunction with the existing hydraulic components, thereby improving measurement precision while minimizing the impact on manufacturing ease
3Measurement precision
If a proximity sensor with magnet is used for detection, then the measurement precision is improved, but the loss of substance increases due to additional components
Solution Approach 1:
The invention replaces complex mechanical position sensing mechanisms with a magnetic field-based proximity sensor system. The magnet attached to the piston rod interacts with the proximity sensor through the cylinder wall, eliminating the need for mechanical linkages, gears, or contact-based sensors. This substitution significantly improves measurement precision while minimizing material consumption, as magnetic fields require no physical medium and the components are extremely compact
Solution Approach 2:
The proximity sensor can detect the magnet through the thin wall of the cylinder tube, utilizing the tube wall as a non-magnetic barrier that allows magnetic field penetration. This eliminates the need for additional openings, windows, or complex sealing mechanisms in the cylinder structure, thereby improving measurement precision while minimizing material consumption and structural modifications
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
Enhances operational efficiency by accurately determining the swing position of the working tool, improving the accuracy of scooping and dumping operations and providing real-time feedback to operators.
Implementation Method 1
The detector is constituted by a proximity sensor, which is attached to the piston rod between the cylinder tube and the support member so as to be able to face the detected object, and which is configured to move together with the piston rod to detect the magnet
Data Source
AI summary
A working machine, in which a detection device for detecting a swing position of a supported member is prevented from being damaged, includes a support member pivotally supporting the supported member via a pivot, and a cylinder telescopically moved by extension and contraction movement of its piston rod with respect to its cylinder tube by hydraulic fluid flowing through a fluid passage formed in the piston rod. The cylinder tube is pivotally supported by a first end portion of the support member, and the piston rod is pivotally supported by a second end portion of the support member. The detection device for detecting a telescopic movement state of the cylinder is provided between the cylinder and the support member.