Force Sensor Calibration Lever Gravity Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing internal calibration mechanisms for force sensors, particularly strain gauge load cells, suffer from significant calibration errors, exceeding acceptable standards, which compromises the accuracy and reliability of the sensors.
Innovation Solution
A method for configuring a calibration mechanism in a force sensor involves coupling a calibration lever to the loading end, adjusting the gravity center of the lever in no-load and full-load conditions to align approximately on a horizontal line through the fulcrum, thereby reducing calibration errors caused by inclination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an internal calibration mechanism is integrated into a strain gauge force sensor, then the convenience of calibration and sensor protection is improved, but calibration accuracy deteriorates due to structural limitations
Solution Approach 1:
The calibration mechanism is segmented into separate functional components: a calibration lever, a calibration weight, and a fulcrum mechanism. This segmentation allows each component to be optimized independently for its specific function while maintaining overall calibration accuracy.
Solution Approach 2:
The patent introduces a spatial arrangement dimension by positioning the calibration lever at a specific angle (45 degrees) relative to the loading end and adjusting the fulcrum position accordingly. This dimensional arrangement creates a geometric relationship that compensates for structural limitations and achieves accurate calibration.
2Device complexity
If the calibration lever is positioned close to the loading end, then the calibration mechanism compactness is improved, but calibration accuracy deteriorates due to inclination errors
Solution Approach 1:
The calibration lever is designed to be adjustable in position and angle, allowing dynamic optimization during setup. The lever can be positioned at different angles and the fulcrum can be adjusted to achieve the optimal configuration for accurate calibration while maintaining compactness.
Solution Approach 2:
The patent changes critical parameters including the lever angle (set to 45 degrees), fulcrum position, and lever length to optimize the balance between compactness and accuracy. These parameter adjustments create a geometric configuration that minimizes inclination errors.
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
This configuration significantly reduces calibration errors and maintains the accuracy of the force sensor by ensuring the gravity center of the calibration lever is aligned with the fulcrum, even under varying load conditions.
Implementation Method 1
adjusting, in a no-load condition, the gravity centre of the unloaded calibration lever, so that the gravity centre is lying substantially on a horizontal line which goes through the centre of a calibration lever fulcrum
Data Source
AI summary
A method for configuring a calibration mechanism in a force sensor (100) has the steps of: coupling an end of the calibration lever (1071) to a loading end (102) of the force sensor; adjusting, in a no-load condition, the center of gravity (G0) of the unloaded calibration lever (1071), so that the center of gravity (G0) lies on a horizontal line (H) through the center of a calibration lever fulcrum (1031) at a fixed end (103) thereof; and adjusting, in a full-load condition, the center of gravity (G1) of the calibration lever (1071) loaded with the calibration weight (106), so that the center of gravity (G1) lies on the horizontal line (H) through the center of the calibration lever fulcrum. The calibration error caused by inclination in the force sensor is reduced by practice of this method.