Coriolis Weighing Scale Structure for Small-Flow Measurement Accuracy
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Solution Overview
Problem
Existing Coriolis weighing scales face challenges in maintaining high measuring accuracy due to complex gear transmission mechanisms, which increase processing and assembly difficulties, maintenance costs, and overall device costs, making them economically unfeasible for precise measurement of small-flow materials.
Innovation Solution
A Coriolis weighing scale design with a driving portion that includes an outer housing body, a drive motor with an output shaft outside the housing, a motor seat, and a bearing support, utilizing coaxial shaft holes and bearings to integrate the motor and bearing support, reducing friction and maintaining torque accuracy, and a weighing portion with a measuring plate driven by a gearless mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional load cells are used in conveyor belt scales, then the structure is simple and cost is low, but measurement precision deteriorates due to belt slip and frame deformation
Solution Approach 1:
The patent replaces the traditional mechanical load cell measurement system with a Coriolis force-based measurement system. Instead of using load cells that measure weight through mechanical deformation, the invention uses a vibrating measuring tube where the Coriolis force generated by the moving belt directly modulates the vibration characteristics. This substitution eliminates the need for mechanical load cells and their associated mounting structures, thereby improving measurement precision while managing device complexity.
Solution Approach 2:
The patent introduces a vibrating measuring tube as an intermediary element between the conveyor belt and the measurement system. The measuring tube couples the belt's motion to the vibration system, allowing the Coriolis force to be generated and measured. This intermediary enables the transformation of the belt's linear motion into measurable vibrational changes without requiring direct mechanical load cell connections, thus improving precision while structuring the complexity in a manageable way.
2Measurement precision
If load cells are mounted on conveyor belt frames, then installation is simple, but measurement precision deteriorates due to frame deformation affecting load cell readings
Solution Approach 1:
The patent replaces the load cell-based mechanical measurement system with a Coriolis force-based vibrational measurement system. By eliminating load cells and their frame mounting requirements, the invention removes the source of measurement errors caused by frame deformation. The measuring tube is suspended or supported in a way that isolates it from frame deformation effects, thereby improving precision while redistributing manufacturing complexity to the vibration system rather than the frame structure.
3Measurement precision
If belt slip occurs during conveyor operation, then operation continues normally, but measurement precision deteriorates because load cells cannot accurately measure belt tension
Solution Approach 1:
The patent replaces the tension-based load cell measurement with a Coriolis force-based measurement that directly responds to the belt's motion. Since the Coriolis force is generated by the interaction between the vibrating tube and the moving belt mass, it naturally accounts for slip conditions. When slip occurs, the relative motion between belt and tube changes the Coriolis signal in a way that can be detected and used to maintain measurement reliability, unlike load cells that simply lose tension signal.
Solution Approach 2:
The patent uses mechanical vibration of the measuring tube as the core measurement mechanism. The vibration creates a dynamic system where the Coriolis force from belt motion modulates the vibration frequency and phase. This vibrational approach provides continuous measurement during operation and can detect slip conditions through changes in vibration characteristics, maintaining both precision and reliability under varying operational conditions including belt slip.
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 and reduces costs by simplifying the structure, facilitating easier assembly and maintenance, while being suitable for precise measurement of small-flow materials.
Implementation Method 1
a Coriolis scale according to the invention uses a vibrating measuring tube (10) and a sensor system (20) for detecting the position of the belt (1)
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 weighing portion, and the weighing portion includes: a feed member, provided with a feed port for a material to enter, and located upstream of a material travel direction; a protective housing body, arranged at an outer side of the feed member along a circumferential direction; a connecting pipe, coupled to the protective housing body, and having an opening facing a space between the feed member and the protective housing body; and a measuring plate, arranged below the feed member along the material travel direction, an air passage is formed between the protective housing body and the feed member, the connecting pipe is configured to pass compressed air at an end portion of the feed member that is located on a side of the measuring plate through the air passage.