Weighing Sensor Calibration Weight Assembly Design
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Solution Overview
Problem
Existing weighing sensors with monolithic structures face challenges in achieving high design efficiency and accuracy due to the vertical alignment of components, which limits the reduction ratio and requires a large design, and the direct connection of calibration weights to levers restricts flexibility and increases mass.
Innovation Solution
The calibration weight rest is connected to coupling elements on opposite sides of the lever mechanism, allowing for force reversal and placement on any lever, enabling a smaller and lighter design without weakening the load cell, and can be easily replaced or adjusted without additional manufacturing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the calibration weight arrangement is directly connected to the lever system, then the position is determined by the direction of force, but this restricts flexibility and increases mass
Solution Approach 1:
A coupling element with a coupling rod is introduced as an intermediary between the calibration weight rest and the lever system. This coupling element can be connected to the mainland body via a supporting joint and to a lever via a coupling rod, allowing the calibration weight rest to be placed on any lever without being directly constrained by the force direction. The coupling element acts as a mediator that decouples the direct force direction constraint while maintaining the calibration function.
2Productivity
If vertical alignment is used in the lever mechanism, then high reduction ratios can be achieved, but a large design is obligatory
Solution Approach 1:
The patent allows the calibration weight rest to be connected to any lever in the lever mechanism, not necessarily the first lever. This enables the use of later levers (second, third, fourth, or fifth levers) which may be arranged in different spatial dimensions or orientations. By connecting to a later lever in the sequence, the calibration weight assembly can be positioned more compactly, reducing the overall design size while still achieving the required reduction ratio through the lever mechanism's mechanical advantage.
3Force
If the calibration weight rest is connected to the first lever, then direct force transmission is achieved, but the calibration weight must have larger mass
Solution Approach 1:
The coupling element is pre-configured with a supporting joint connection to the mainland body and a coupling rod connection to the lever. This preliminary arrangement of the coupling mechanism allows the calibration weight rest to be connected to later levers in the mechanism (second lever, third lever, fourth lever, or fifth lever) rather than requiring direct connection to the first lever. This preliminary coupling arrangement enables the use of smaller calibration weights while maintaining adequate force transmission through the lever mechanism's mechanical advantage.
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 enhances measurement accuracy and repeatability by allowing force reversal, reducing the mass and size of the calibration weight assembly, and simplifies assembly and maintenance while maintaining structural integrity.
Implementation Method 1
the at least one coupling element is connected to the mainland body via a supporting joint and connected to a lever via a coupling rod. It is thus possible that a reversal of the direction of the force is caused by the coupling element.
Implementation Method 2
the coupling rod of the coupling element is loaded in compression
Implementation Method 3
the coupling rod of the coupling element can be loaded in tension
Data Source
AI summary
A weighing sensor for a scale, includes a mainland body, a load receiver articulated on the mainland body by parallelogram guiding, and a lever mechanism having at least two levers which are supported on the mainland body by supporting joints, a first lever being arranged closer to a load receiver than a second lever, and the at least two levers being connected to each other via coupling rods and load joints, a calibration weight assembly including a calibration weight rest and a calibration weight being arranged on one lever, the calibration weight rest being connected to at least one coupling element.