Calibration Fixture Rotating Bar Axial Alignment
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Solution Overview
Problem
Conventional calibration fixtures for machine vision vehicle wheel alignment measurement systems are heavy and rigid, making them prone to distortion and inaccuracy due to external influences during use, which can affect the calibration process.
Innovation Solution
A lightweight calibration fixture with a rotating transverse bar supported within an outer structural tube by annular bearings, maintaining axial alignment and protecting against external forces that could cause deflection or distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a heavy and rigid construction is used for the calibration fixture, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The calibration fixture is divided into separate components: a stationary outer support tube and a rotating inner transverse bar. This segmentation allows the outer tube to provide stable support while the inner bar can be easily rotated and positioned, resolving the contradiction between precision and ease of operation.
Solution Approach 2:
The inner transverse bar is designed to rotate freely within the outer support tube, transitioning from a static heavy structure to a dynamic system where the inner bar can be easily manipulated. This dynamic design maintains calibration precision through the constrained rotation path while significantly improving ease of handling.
2Stability of the object's composition
If a heavy and rigid construction is used for the calibration fixture, then stability is improved, but object-affected harmful factors worsen
Solution Approach 1:
The outer support tube acts as an intermediary protective structure that shields the inner transverse bar from external forces. This nested design allows the inner bar to maintain precise calibration geometry while being protected from environmental disturbances, solving the contradiction between stability and susceptibility to external forces.
Solution Approach 2:
The outer support tube provides beforehand protection against external forces that could distort the inner transverse bar. By pre-establishing this protective enclosure, the system prevents harmful effects before they can affect the calibration accuracy.
3Ease of operation
If a lightweight construction is used for the calibration fixture, then ease of operation is improved, but manufacturing precision deteriorates
Solution Approach 1:
By segmenting the fixture into an outer support tube and inner transverse bar, the design achieves lightweight construction through the inner bar while the outer tube provides the necessary precision reference. This segmentation resolves the contradiction between lightweight design and manufacturing precision.
Solution Approach 2:
The outer support tube serves as a precision reference frame that mediates between the lightweight inner bar and the calibration requirements. The tube's precise manufacturing provides the accuracy reference, while the lightweight inner bar provides ease of operation, resolving the precision-ease contradiction.
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 solution ensures accurate axial alignment of optical targets and minimizes the risk of distortion during calibration procedures, maintaining precision while being easier to handle and position.
Implementation Method 1
The rotating transverse bar is supported within the outer support tube by annular bearings adjacent each end of the outer support tube
Data Source
AI summary
A calibration fixture for use during a calibration procedure of a machine vision vehicle wheel alignment system. The calibration fixture consists of a pair of support legs, and a rotating transverse bar supported within an outer support tube secured between the support legs. The rotating transverse bar is supported within the outer support tube by a pair of annular bearings adjacent each end of the outer support tube, and is isolated from external influences which may result in deflection or distortion. A hub for receiving a sensor or optical target is secured to each end of the rotating transverse bar, such that optical targets mounted to each hub are maintained in axial alignment at opposite ends of the rotating transverse bar.