Coriolis Weighing Scale Drive Structure for Stable Small-Flow Measurement
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Solution Overview
Problem
Existing Coriolis weighing scales face challenges in maintaining high measuring accuracy and are economically inefficient due to complex gear transmission mechanisms, leading to high processing and maintenance costs.
Innovation Solution
A Coriolis weighing scale design with a driving portion that includes an outer housing body, a drive motor partially located outside, a motor seat, and a bearing support, utilizing bearings to integrate the motor and bearing components, reducing the complexity and cost while maintaining accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional load cells or strain gauges are used for weight measurement, then the system is simple in structure, but the system is sensitive to external influences such as temperature changes and mechanical stress
Solution Approach 1:
The patent replaces conventional mechanical strain gauges and load cells with a Coriolis mass flow meter that uses vibratory measurement principles. The mass flow meter measures weight by detecting the frequency shift of a vibrating element caused by the mass of material on the conveyor, eliminating sensitivity to temperature and mechanical stress that plagues electrical strain measurement systems.
Solution Approach 2:
The invention changes the measurement parameter from electrical resistance (strain gauges) to vibratory frequency (Coriolis mass flow meter). By measuring the natural frequency of a vibrating element that changes when mass is added, the system achieves temperature-compensated measurements since frequency is inherently less sensitive to thermal effects than electrical resistance.
2Reliability
If a Coriolis mass flow meter is used for weight measurement, then temperature compensation is achieved, but the device complexity increases
Solution Approach 1:
The patent applies a multi-functional Coriolis mass flow meter that simultaneously measures weight, material density, and flow rate. This single device replaces what would otherwise require multiple separate measurement instruments, achieving temperature stability while actually reducing the number of components needed compared to a system using strain gauges plus temperature sensors plus compensation electronics.
Solution Approach 2:
The Coriolis mass flow meter performs self-compensation for temperature effects through its vibratory measurement principle. The system automatically adjusts measurements based on the measured frequency, which inherently accounts for temperature effects on the vibrating element, eliminating the need for external temperature sensors or software compensation algorithms.
3Measurement precision
If strain gauges are used on the conveyor, then the system can detect weight, but the system becomes sensitive to bending and stretching of the conveyor
Solution Approach 1:
The patent replaces strain gauge-based mechanical measurement with a vibratory Coriolis measurement system. The mass flow meter's vibrating element is suspended in a way that isolates it from conveyor bending and stretching, measuring weight through inertial effects rather than mechanical strain, thereby eliminating sensitivity to conveyor mechanical disturbances.
Solution Approach 2:
The patent introduces a suspended platform or pan as an intermediary between the conveyor and the Coriolis mass flow meter. This intermediary isolates the sensitive vibrating element from direct mechanical coupling with the conveyor, allowing weight measurement while filtering out bending and stretching forces from the measurement signal.
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 new design enhances measuring accuracy for small-flow materials and reduces overall costs by simplifying the structure and assembly process, making it more economically viable.
Implementation Method 1
The Coriolis mass flow meter is configured to measure the weight of the material on the conveyor belt by detecting the frequency of vibration of the vibrating element
Implementation Method 2
a vibrating element in the Coriolis mass flow meter is affected by gravitational force when material is placed on the conveyor
Data Source
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AI summary
An embodiment of the present disclosure provides a Coriolis weighing scale and a weighing method. The Coriolis weighing scale includes a driving portion, the driving portion includes: an outer housing body, an accommodating space being defined inside the outer housing body; a drive motor, having a base and an output shaft member, at least a portion of the drive motor being arranged outside the outer housing body; a motor seat, fixed to the base of the drive motor and having a first shaft hole, the output shaft member running through the first shaft hole; and a bearing support, arranged at an outer side of the motor seat along a radial direction and having a second shaft hole, the motor seat and the bearing support are arranged in the accommodating space, the bearing support is fixed to the outer housing body, the first shaft hole and the second shaft hole are coaxial, a first bearing is provided between a side wall of the first shaft hole of the motor seat and the output shaft member, and a second bearing is provided between an outer wall of the motor seat and a side wall of the second shaft hole of the bearing support.