Weighing Apparatus Conveyor Stop and Reverse Calibration
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Solution Overview
Problem
Existing weighing devices face challenges in accurately compensating for static-dynamic offset due to the need for manual intervention and repeated measurements, which is time-consuming and operator-dependent.
Innovation Solution
A weighing device with a controller that automatically stops and reverses the conveyor, allowing for both dynamic and static weighing processes to be performed automatically, enabling the calculation of a correction value for precise weight determination without operator intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual removal and repositioning of test material is performed after each dynamic weighing, then multiple dynamic measurements can be obtained for accurate correction value calculation, but the calibration process becomes time-consuming and operator-dependent
Solution Approach 1:
The conveyor system is made dynamically controllable through automated stop and reverse functions. The controller automatically stops the conveyor during weighing operations and reverses its direction of movement, enabling the same test material to be repeatedly weighed without manual intervention. This dynamic control resolves the contradiction by maintaining measurement accuracy through multiple measurements while eliminating the time-consuming manual handling process.
Solution Approach 2:
The weighing system performs self-calibration through automated operations. The controller autonomously manages the conveyor's stop and reverse actions, and automatically calculates the correction value from multiple dynamic measurements without requiring operator involvement. This self-service capability resolves the contradiction by achieving precise correction values through multiple measurements while eliminating operator dependency and reducing calibration time.
2Measurement precision
If multiple dynamic weighing measurements are performed to determine an average value for correction, then the correction value becomes more accurate, but the process requires repeated manual intervention
Solution Approach 1:
The weighing system performs self-calibration through automated operations. The controller autonomously manages the conveyor's stop and reverse actions, and automatically calculates the correction value from multiple dynamic measurements without requiring operator involvement. This self-service capability resolves the contradiction by achieving precise correction values through multiple measurements while eliminating operator dependency and reducing calibration time.
Solution Approach 2:
The controller implements a feedback mechanism where measurement results from dynamic weighing are automatically processed to calculate the correction value. The system uses the measured values from multiple dynamic measurements, computes their average, and automatically determines the correction value without manual calculation. This feedback loop resolves the contradiction by maintaining high measurement precision while eliminating the need for repeated manual intervention.
3Productivity
If the conveyor is automatically stopped and reversed by the controller, then the same product can be automatically weighed multiple times without manual intervention, but the system complexity increases
Solution Approach 1:
The existing controller is enhanced with multi-functionality to manage both the conveyor's motion control (stop and reverse operations) and the weighing calibration process. This single controller performs multiple functions: it controls the conveyor during normal operation, automatically stops the conveyor during weighing, reverses the conveyor direction, and calculates the correction value from measurements. This multi-functionality resolves the contradiction by automating the calibration process to improve productivity while minimizing the need for additional separate control systems.
Solution Approach 2:
The control functions for conveyor operation and weighing calibration are merged into a single integrated control process. The controller combines the functions of managing conveyor motion (including stop and reverse operations) with the calibration measurement and correction value calculation. This merging resolves the contradiction by enabling automated repeated weighing to improve productivity while avoiding the complexity of adding separate independent control systems.
Data Source
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AI summary
The present invention relates to a weighing apparatus (1), in particular a pricing apparatus or checkweigher, having scales for weighing a product in a weighing section (AW), having a conveying device (4) for transporting the product (3) along a conveying region (F) from a starting position (PStart) to a target position (PZiel) via the weighing section (AW). In order to simplify calibration for the purpose of compensating for a static/dynamic offset, the invention proposes that the weighing apparatus (1) also has a control device (5) which is configured in such a manner that the conveying device (4) can be automatically stopped in a direction from the starting position (PStart) to the target position (PZiel) during the operation thereof and can then be automatically operated in a direction from the target position (PZiel) to the starting position (PStart). The invention further relates to a corresponding method for weighing a product (3).