Electronic Balance Auto-Loading for Stable Weighing Accuracy
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Solution Overview
Problem
Users often neglect preliminary loading, which is crucial for maintaining high weighing accuracy in electronic balances with windshields, as it is time-consuming and cumbersome, and the windshield door opening and closing process is inconvenient.
Innovation Solution
An electronic balance with automated mechanisms for opening and closing the windshield door and applying/removing a built-in weight, controlled by a control unit to perform preliminary loading operations automatically, including temperature sensing and timing to adapt to environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If preliminary loading is performed manually by opening and closing the windshield door, then weighing accuracy is stabilized, but operation time increases and user convenience deteriorates
Solution Approach 1:
The system automatically performs preliminary loading operations before actual weighing, adapting the weighing mechanism to the current environment. The control unit executes a sequence of operations including opening the door, applying built-in weight, closing the door, waiting for predetermined time, removing weight, and performing zero-point adjustment, thereby stabilizing weighing accuracy without requiring user intervention.
Solution Approach 2:
The electronic balance performs self-calibration and self-adaptation through automatic preliminary loading. The control unit autonomously controls the opening/closing mechanism and moving up/down mechanism to execute the preliminary loading sequence, making the system self-sufficient in stabilizing its own weighing accuracy without external user assistance.
2Ease of operation
If automatic opening and closing mechanism is added to the windshield door, then preliminary loading becomes easier to perform, but device complexity increases
Solution Approach 1:
The opening and closing mechanism is integrated with the control unit that manages the preliminary loading sequence. The control unit coordinates the door opening/closing operations with the built-in weight application/removal operations, merging multiple functions into a unified automated system that reduces operational complexity despite adding mechanical components.
Solution Approach 2:
The opening and closing mechanism serves multiple functions: it enables manual door operation, automatic preliminary loading execution, and environmental adaptation. The same mechanism is used for both user-initiated weighing operations and automated calibration sequences, maximizing the utility of the added component.
3Extent of automation
If built-in weight and moving up/down mechanism are added, then automatic preliminary loading is enabled, but device complexity and cost increase
Solution Approach 1:
The moving up/down mechanism is combined with the opening and closing mechanism under unified control by the control unit. Both mechanisms execute coordinated operations as part of the automated preliminary loading sequence, sharing control logic and timing mechanisms, thereby reducing overall system complexity despite multiple moving parts.
Solution Approach 2:
The built-in weight serves multiple purposes: it provides calibration mass for preliminary loading, enables zero-point adjustment verification, and can be used for testing the moving up/down mechanism functionality. The moving up/down mechanism similarly serves both automated preliminary loading and manual operation modes.
4Measurement precision
If temperature sensing and automatic preliminary loading are implemented, then weighing accuracy is maintained under environmental changes, but device complexity increases
Solution Approach 1:
The temperature sensor provides feedback to the control unit about environmental conditions inside the weighing chamber. When temperature change exceeds a predetermined threshold, the control unit automatically triggers the preliminary loading sequence, creating a feedback-based adaptive system that maintains weighing accuracy under varying environmental conditions.
Solution Approach 2:
The system monitors temperature as a physical parameter and responds to its changes by initiating preliminary loading operations. The control unit adjusts the weighing process based on temperature parameter variations, performing automatic adaptation when environmental conditions change beyond acceptable thresholds.
Data Source
AI summary
The electronic balance is configured to be capable of performing the following series of operations (I) to (VII) automatically: (I) The opening and closing mechanism opens the door. (II) The moving up/down mechanism applies the load of the built-in weight to the weighing mechanism. (III) The opening and closing mechanism closes the door. (IV) After a predetermined period of time elapses, the opening and closing mechanism opens the door. (V) The moving up/down mechanism removes the load of the built-in weight from the weighing mechanism. (VI) The opening and closing mechanism closes the door. (VII) The control unit performs zero-point adjustment of the weighed value. Accordingly, operation of preliminary loading is automatically performed, and thus the stability of the weighing accuracy is improved.