Drive Unit Mount for Conveying Scale Weighing Accuracy
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Solution Overview
Problem
Existing scale technologies face challenges in minimizing the mechanical and metrological influence of the motor drive unit on the transport device, leading to deformation, corner load errors, and inaccurate weighing signals due to off-centre motor arrangements and vibrations.
Innovation Solution
A mount for the drive unit is placed between the load cell and the transport device, allowing the weight force to be introduced into the load cell through a receptacle, which is designed to be rigid and stable, reducing eccentric loads and enabling a modular, easy-to-use design with electromagnetic compatibility and IP protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the motor drive unit is arranged on the transport device, then the transport device can be driven, but the motor mass deforms the transport device and causes shocks
Solution Approach 1:
The system is divided into separate functional modules: the drive unit is separated from the transport device and positioned on a separate support structure. This segmentation allows the heavy motor mass to be isolated from the transport device, preventing deformation while maintaining drive capability through the transmission mechanism.
2Ease of operation
If the motor is arranged off-centre to the load cell, then the transport device can be decoupled from the drive unit, but corner load errors occur and weighing signals are falsified
Solution Approach 1:
The support structure is designed with an asymmetric configuration where the drive unit is positioned at a specific offset distance from the load cell center. This controlled asymmetry allows decoupling of the drive unit from the transport device while maintaining accurate weight measurement by optimizing the moment arm and force transmission path.
Solution Approach 2:
A rigid support structure acts as an intermediary between the load cell and the drive unit. This mediator transmits the weight force from the transport device through the drive unit to the load cell while maintaining structural stability and preventing falsification of weighing signals despite the off-center arrangement.
3Power
If vibrations from the floor are present, then the drive unit can operate, but large moments are created at load introduction that falsify weighing signals
Solution Approach 1:
The support structure is designed with vibration-damping features and rigid connections that preemptively counteract floor vibrations before they can create large moments at the load introduction point. This prior cushioning protects the weighing signal from falsification while allowing the drive unit to operate normally.
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 mechanical loads on the transport device, stabilizes the scale, minimizes vibrations, and ensures accurate weighing by centering the drive unit's weight, enhancing service life and safety while allowing for quick assembly and disassembly, and protecting against electromagnetic interference and moisture.
Implementation Method 1
the load cell experiences the weight force to be detected over a force introduction area and in the direction of an imaginary force introduction axis
Implementation Method 2
introduce the weight force from the transport device through the receptacle into the load cell
Data Source
Figure 1
AI summary
The invention relates to a holding fixture (4) for the drive unit of a conveying device (5) that conveys goods (G) to be weighed, whereby in order to transfer the weight to be measured, the holding fixture (4) is placed between the conveying device (5) and the weigh cell (2) that measures the weight.