Parallel-Guiding Mechanism Eccentric Load Error Adjustment
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Solution Overview
Problem
Existing parallel-guiding mechanisms in gravimetric measuring instruments face challenges in accurately adjusting for eccentric load errors, particularly in precision balances and analytical balances, due to the need for sensitive manual adjustments and material stress issues with current correction methods, which can lead to temperature-dependent errors and limited adjustment ranges.
Innovation Solution
A parallel-guiding mechanism with an adjustment zone featuring an adjustment flexure fulcrum and an elastic sector with a smaller section modulus than the flexure fulcrum, allowing for precise adjustment through controlled plastic deformation and independent adjustment zones for longitudinal and transverse corrections, minimizing material stress and temperature effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If material is removed from the flexure pivot by grinding or filing to correct eccentric load errors, then the eccentric load error is corrected, but the flexure pivot becomes more sensitive to temperature changes and experiences increased material stress
Solution Approach 1:
The invention divides the flexure pivot into two separate components: a main flexure pivot and a separate adjustment piece. This segmentation allows the adjustment piece to be modified for eccentric load correction without affecting the main flexure pivot's temperature stability. The adjustment piece can be independently adjusted while the main flexure pivot remains intact and unaffected by material removal.
Solution Approach 2:
The adjustment piece acts as an intermediary between the weighing pan and the main flexure pivot. It provides a mechanism for correcting eccentric load errors through material removal while isolating the main flexure pivot from direct modification. This intermediary approach allows correction of measurement errors without compromising the temperature stability of the primary load-bearing component.
2Measurement precision
If manual adjustment methods are used to correct eccentric load errors, then correction is possible, but the adjustment process becomes complex and requires sensitive manual operations
Solution Approach 1:
The adjustment piece is designed to be self-adjusting through controlled material removal. The structure allows for systematic adjustment where material can be removed in a controlled manner to achieve the desired correction. This reduces the complexity of manual adjustment operations while maintaining precision in correcting eccentric load errors.
3Measurement precision
If the parallel-guiding members are made absolutely parallel to eliminate eccentric load errors, then measurement accuracy improves, but the manufacturing complexity and cost increase
Solution Approach 1:
The invention performs preliminary correction of eccentric load errors through the adjustable piece before final assembly and use. By providing an adjustment mechanism that can be tuned after manufacturing, the system accepts that the parallel-guiding members will not be perfectly parallel during manufacturing, but allows for post-manufacturing correction to achieve the required measurement accuracy.
Solution Approach 2:
The invention changes the approach from requiring perfect geometric parameters (absolutely parallel guides) to accepting approximate parameters and providing a mechanism for parameter adjustment. The adjustment piece allows modification of the effective parallelism after manufacturing, enabling the system to achieve high measurement precision without requiring extremely tight manufacturing tolerances.
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 solution enables precise correction of eccentric load errors without increasing temperature-dependent errors or long-term drift, allowing for accurate measurements in high-resolution instruments and reducing the need for frequent calibrations.
Implementation Method 1
the adjustment lever (137) has an elastic sector (130) whose section modulus is smaller than the section modulus of the adjustment flexure fulcrum (136)
Implementation Method 2
A parallel-guiding mechanism with an adjustment zone featuring an adjustment flexure fulcrum and an elastic sector with a smaller section modulus than the flexure fulcrum, allowing for precise adjustment through controlled plastic deformation
Data Source
AI summary
A parallel-guiding mechanism (120) has a movable parallel leg (121), a stationary parallel leg (122), a first parallel-guiding member (123) and a second parallel-guiding member (124). The parallel legs and the parallel-guiding members are connected to each other by flexure pivots, in the form of narrow material connections. There is at least one adjustment zone (135). An adjustment flexure fulcrum (136) is arranged between a flexure pivot (131) and a parallel leg. The adjustment zone is connected to the first lever end (138) of an adjustment lever (137). The adjustment flexure fulcrum forms the lever fulcrum (146) of the adjustment lever, which has an elastic domain with a section modulus that is smaller than a section modulus of the adjustment flexure fulcrum.