Excavator Rotation Sensor Assembly for Easier Magnetic Alignment
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Solution Overview
Problem
Existing rotation sensor assemblies for excavators are challenging to calibrate and adjust, making it difficult to accurately detect the relative rotational motion and angle between the boom and the cab.
Innovation Solution
A rotation sensor assembly comprising a first portion attached to the cab and a fixation member attached to the boom, with magnetic sensors and alignment features to ensure accurate detection of angular position and motion, featuring a base bracket with slots for bolt attachment and a protection member for component protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a wire sensor is used to detect the rotation of the first boom, then the rotational motion can be detected, but it is challenging to calibrate the sensor
Solution Approach 1:
The patent replaces the wire sensor (mechanical/electrical system) with a magnetic sensor system consisting of a magnetic sensor portion and a magnetic sensor base. This substitution eliminates the calibration challenges associated with wire sensors while maintaining the ability to detect rotational motion and angular position of the boom accurately.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the sensor components and the boom. The magnetic sensor portion detects the angular position by sensing changes in the magnetic field generated by the magnetic sensor base, which moves with the boom. This intermediary approach simplifies the detection system and removes the need for complex calibration procedures.
2Measurement precision
If a swing angle calibration system is used, then the swing angle can be calibrated, but it is challenging to adjust the system
Solution Approach 1:
The patent makes the sensor mounting system dynamic and adjustable by providing a mounting structure with multiple mounting positions and adjustable mounting members. This allows the magnetic sensor base to be repositioned along the boom at different locations and orientations, enabling easy adjustment and optimization of the sensor system for various operating conditions without requiring complex calibration procedures.
Solution Approach 2:
The patent divides the sensor system into separable components: a magnetic sensor portion, a magnetic sensor base, and a mounting structure. This segmentation allows each component to be independently adjusted and positioned, making the overall system more flexible and easier to adjust while maintaining accurate swing angle detection.
3Illumination intensity
If the sensor mounting member and sensor portion are aligned closely, then the magnetic field amplitude is sufficient, but the alignment requires precision
Solution Approach 1:
The patent employs self-aligning features in the mounting structure, including self-centering mechanisms and flexible mounting members that automatically adjust to achieve proper alignment. This self-service approach ensures that the magnetic sensor portion and magnetic sensor base are positioned close together with sufficient magnetic field amplitude without requiring high-precision manual alignment during installation.
Solution Approach 2:
The patent allows for adjustment of the relative position and orientation parameters between the magnetic sensor portion and magnetic sensor base through the adjustable mounting structure. This enables optimization of the magnetic field amplitude by changing positional parameters while maintaining ease of installation through the flexible mounting system.
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
Enables flexible and easy adjustment for accurate detection of the relative rotational motion and angle between the boom and cab, ensuring a strong magnetic field amplitude and protecting the sensor components.
Implementation Method 1
the rotation sensor assembly is arranged and configured to detect the angular position and/or angular motion of the sensor portion relative to the sensor base
Data Source
AI summary
A rotation sensor assembly comprising a first portion and a protection member is disclosed. The first portion is configured to be attached to a cap of an excavator wherein the protection member is configured to be attached to a boom of the excavator. The first portion comprises an L-shaped angle bracket attached to a base bracket having a foot portion. The first portion comprises a magnetic sensor portion and the protection member comprises a magnetic sensor mounting member. The rotation sensor assembly is arranged and configured to detect the angular position and/or angular motion of the sensor portion relative to the sensor mounting member.