Internal Calibration Weight Structure for Compact Weigh Modules
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Solution Overview
Problem
The mass and size of internal calibration weights in electronic balances are limited due to space constraints, affecting weighing performance and accuracy.
Innovation Solution
An internal calibration mechanism with a lever-based support frame and driving structure that amplifies the force of a smaller calibration weight using a lever principle, allowing for a compact and efficient calibration system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an internal calibration mechanism is added to the electronic balance, then calibration convenience is improved, but the available internal space is reduced
Solution Approach 1:
The internal calibration weight is nested within the weigh module structure, specifically integrated into the load-receiving portion. The calibration weight can be stored inside the weigh module when not in use, and deployed when calibration is needed. This nesting approach allows the calibration mechanism to occupy minimal space while providing full calibration functionality.
Solution Approach 2:
The calibration mechanism is merged with the existing weigh module structure. The internal calibration weight support frame is integrated into the load-receiving portion, and the calibration weight shares the same structural space as the weighing mechanism. This merging eliminates the need for separate calibration weight storage space.
2Measurement precision
If a larger internal calibration weight is used to meet weighing performance requirements, then calibration accuracy is improved, but the size and space occupation increase
Solution Approach 1:
The internal calibration weight support frame is designed as a movable structure that can dynamically adjust its position. The frame includes a moving portion that can shift between a storage position (when calibration is not needed) and a working position (when calibration is performed). This dynamic design allows the calibration weight to access the optimal measurement position without permanently occupying excessive space.
Solution Approach 2:
The calibration weight support frame utilizes vertical space by extending in the vertical direction. The frame includes a vertical portion that allows the calibration weight to be positioned at different heights, effectively using the vertical dimension to achieve the required leverage arm length without increasing the horizontal footprint of the weigh module.
3Volume of stationary object
If the internal calibration weight size is reduced to fit space constraints, then space utilization is improved, but calibration performance deteriorates
Solution Approach 1:
The movable support frame allows a smaller calibration weight to achieve the same calibration effect as a larger stationary weight. By dynamically positioning the smaller weight at the optimal distance from the fulcrum point, the system achieves the required calibration performance without needing a large heavy weight that would occupy excessive space.
Solution Approach 2:
The system uses the vertical dimension to create leverage arm length. By extending the support frame vertically and positioning the calibration weight at an optimized height, the system achieves the required torque and calibration effect with a smaller weight mass, thereby improving space utilization while maintaining calibration performance.
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
Enables accurate calibration with a smaller internal calibration weight, reducing the size and cost of the weigh module while improving calibration performance.
Implementation Method 1
An internal calibration mechanism with a lever-based support frame and driving structure that amplifies the force of a smaller calibration weight using a lever principle
Data Source
Figure 1~2
Figure 3
AI summary
The present invention discloses an internal calibration mechanism (16) for a weigh module (1), comprising an internal calibration driving structure (161), an internal calibration weight (162) and an internal calibration weight support frame (163, 163'), wherein the internal calibration weight support frame (163, 163') is provided with an opening or a groove, and the opening or the groove is capable of loading the internal calibration weight (162); the internal calibration weight support frame (163, 163') is connected to a weigh module's load receiving portion (11) at both sides of the load receiving portion (11); the internal calibration weight support frame (163, 163') is connected to a portion of a fixing portion (12) extending towards the load-receiving portion (11); and in that the internal calibration weight support frame (163, 163') and the load-receiving portion (11) and the fixing portion (12) of the weigh module (1) are integrally formed; or a force transmission connecting portion and a fulcrum connecting portion of the internal calibration weight support frame (163, 163') are fixedly connected to the load-receiving portion (11) and the portion of the fixing portion (12) extending towards the load-receiving portion (11), respectively; or the internal calibration weight support frame (163, 163') is connected to the load-receiving portion (11) at both sides of the load-receiving portion (11) through flexure hinges; and the internal calibration weight support frame (163, 163') is connected, through a flexure hinge, to the portion of the fixing portion (12) extending towards the load-receiving portion (11). The internal calibration mechanism (16) according to the present invention makes the structure of the sensor simple and compact, effectively reduces the size of the whole sensor, and improves the calibration weighing performance.