Parallel-Guided Coupling for Calibration Weight Decoupling
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Solution Overview
Problem
Existing gravimetric measuring instruments face challenges in maintaining accurate calibration due to geometric deviations in calibration weights, which introduce errors in force transmission to measurement transducers, requiring precise and costly manufacturing of calibration weights and calibration processes.
Innovation Solution
A force-transmitting mechanism with a parallel-guided coupling means that allows the calibration weight to be coupled and decoupled from the load-receiving portion, absorbing transverse displacements and ensuring only compressive or tensile forces are transmitted along the central axis, maintaining geometric stability and minimizing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration weights are integrally incorporated with precise geometric dimensions, then calibration accuracy is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The calibration weight is divided into two separate components: a standard calibration weight with known mass and a counterweight with adjustable mass. This segmentation allows the precise geometric calibration weight to be separated from the adjustable mass component, enabling independent optimization of geometric precision for calibration accuracy while the counterweight handles mass adjustment without requiring high manufacturing precision.
Solution Approach 2:
A coupling element acts as an intermediary between the calibration weight and the force-transmitting mechanism. This intermediary component absorbs geometric deviations and positioning errors, transmitting only the necessary force while compensating for imperfections in the calibration weight's geometry, thus maintaining calibration accuracy without requiring extremely precise manufacturing.
2Measurement precision
If calibration weights are precisely positioned, then calibration accuracy is improved, but device complexity and positioning requirements increase
Solution Approach 1:
The coupling element serves as a mediator that simplifies positioning requirements. Instead of requiring the calibration weight to be precisely positioned relative to the force-transmitting mechanism, the coupling element absorbs positioning errors and geometric deviations, allowing for more tolerant positioning while maintaining calibration accuracy.
Solution Approach 2:
The system changes the critical parameter from geometric positioning precision to mass accuracy. By using a counterweight with adjustable mass, the system shifts the critical parameter from precise positioning of calibration weights to accurate mass measurement, which is easier to control and less complex.
3Stability of the object's composition
If calibration weights are permanently coupled to the load-receiving portion, then calibration stability is improved, but flexibility and adaptability decrease
Solution Approach 1:
The coupling between the calibration weight and the force-transmitting mechanism is made dynamic rather than static. The coupling element can be selectively engaged or disengaged, allowing the system to transition between calibrated and uncalibrated states. This dynamic coupling provides calibration stability when engaged while maintaining flexibility and adaptability when disengaged.
Solution Approach 2:
By segmenting the calibration weight from the force-transmitting mechanism through the coupling element, the system achieves both stability and flexibility. The calibration weight remains separate but can be coupled when needed, providing stable calibration during measurement while allowing flexibility for maintenance, replacement, or different calibration requirements.
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 reduces the impact of geometric deviations, maintaining calibration accuracy and reducing the need for precise positioning of calibration weights, thereby enhancing the reliability and cost-effectiveness of calibration processes in gravimetric measuring instruments.
Implementation Method 1
The parallel-guided coupling part comprises a first and a second parallel element which are arranged parallel to each other and through which the parallel-guided coupling part is tied either to the second calibration lever arm or to the load-receiving portion, to the coupling element or to the lever arm, so that relative travers displacements which occur in the transmission of a force through the parallel-guided coupling means are absorbed by the first and second parallel element
Data Source
AI summary
A force-transmitting mechanism (110) has stationary and load-receiving portions (111, 112). The load-receiving portion is joined to a measurement transducer on the stationary portion through a force-transmitting connection, directly or through at least one coupling element (119) and at least one lever (116). The force-transmitting mechanism has a parallel-guided coupling means (124), a calibration lever (120) with a fulcrum on the stationary portion, and calibration lever arms (121, 122), one of which is rigidly connected to a calibration weight (123). The parallel-guided coupling means (124) is arranged between the second calibration lever arm and the at least one coupling element or an arm (117, 118) of the lever. The parallel-guided coupling means is divided into fixed and parallel-guided coupling parts (126, 125), which allows a force to be transmitted between the coupling parts. Parallel elements of the parallel-guided coupling part absorb relative traverse displacements from transmitted forces.