Bridge Element for Precision Balances
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Solution Overview
Problem
Precision balances face challenges in measuring a wide range of weights and dimensions with high resolution and precision while being insensitive to torques, as existing monolithic weighing cells with parallel rod constructions are limited by load-bearing capacity and production complexity, and increasing the transmission ratio reduces measurement resolution.
Innovation Solution
A bridge element that distributes weight force onto separate levers, reducing stress on individual lever mechanisms, and uses a compact design with parallel levers to guide the load receptor, eliminating the need for a parallel rod construction and allowing for high-precision weighing over large load ranges by combining forces through a step-down mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a stronger magnet system is chosen to extend the measurement range, then the weight capacity is improved, but the cost increases
Solution Approach 1:
The weighing system is divided into multiple independent lever transmissions (first lever transmission and second lever transmission), each handling a portion of the total load. This segmentation allows the use of weaker, more cost-effective magnet systems in each individual transmission while collectively supporting higher weights.
2Force
If the transmission ratio of the lever mechanism is increased to extend the measurement range, then the weight capacity is improved, but the resolution of the measurement system decreases
Solution Approach 1:
The load is divided into multiple parallel lever transmissions, each with a moderate transmission ratio. This segmentation maintains high resolution in each individual transmission while collectively achieving high weight capacity, avoiding the resolution loss that would result from using a single high-ratio transmission.
3Device complexity
If parallel rod construction is used in monolithic weighing cells, then the structure is simplified, but the load-bearing capacity is reduced and torque sensitivity increases
Solution Approach 1:
The single parallel rod construction is segmented into multiple lever transmissions with individual force application points. This segmentation distributes the load across multiple paths, increasing load-bearing capacity and reducing torque sensitivity while maintaining structural simplicity through modular design.
4Force
If multiple transmissions are implemented to extend the measurement range, then the weight capacity is improved, but the production complexity increases and installation space requirements increase
Solution Approach 1:
The weighing cell is divided into multiple independent lever transmission modules that can be produced separately and then assembled. This segmentation reduces production complexity by allowing standardized manufacturing of modular components, while the compact arrangement of these modules minimizes installation space 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
The solution enables precise weighing of various-sized materials with reduced corner sensitivity and torsional moments, allowing for a compact and cost-effective construction that can handle larger loads and accommodate additional components within the balance structure.
Implementation Method 1
force-transmitting levers with which a weight force can be stepped down and/or transmitted to a load cell
Implementation Method 2
The principle of electrodynamic force compensation in particular, though not exclusively, should be considered for the conversion of the weight force into an electrically measurable form
Data Source
AI summary
A precision weighing device is provided formed with a balance having a bridge element, which realizes a parallel guidance between a load receptor and base body by means of force-transmitting levers arranged in advantageously inside the bridge's structure. A balance is made insensitive to corner loads with a spaced-apart arrangement of two bridge elements having the features herein.