Load Measurement Device Vibration Filtering
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Solution Overview
Problem
Load measuring devices with high detection accuracy can incorrectly measure external forces due to vibrations during conveyance in component mounting processes, leading to mistaken measurements.
Innovation Solution
A load measuring device with a start command section and a load acquiring section that only begins acquiring and processing pressing load data when instructed by the mounter, preventing incorrect recording of vibrations as valid data during conveyance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high detection accuracy load sensor is used, then measurement precision is improved, but reliability deteriorates due to mistaken measurements from vibrations during conveyance
Solution Approach 1:
The system performs preliminary actions by having the mounter issue a start command before the mounting head applies pressing force. The load acquiring section is prepared and waiting, but only begins actual measurement when commanded, ensuring it is ready to capture valid data without accidentally recording vibration noise from earlier conveyance stages.
Solution Approach 2:
The system uses feedback control where the mounter's control section issues start commands based on the operational state of the mounting head. The load acquiring section receives and responds to these commands, creating a closed-loop system that ensures measurements are taken only when the mounting head is in the correct state, thereby filtering out invalid vibration data.
2Productivity
If continuous load acquisition is performed, then productivity is improved by continuous monitoring, but measurement precision deteriorates due to recording vibrations as valid data
Solution Approach 1:
Instead of continuous acquisition, the system uses periodic action by acquiring loads only at specific intervals triggered by the start command from the mounter. This periodic sampling approach ensures that measurements are taken only when the mounting head is actively applying pressing force, eliminating vibration noise while maintaining measurement efficiency.
Solution Approach 2:
The mounter's control section performs preliminary action by issuing the start command before the pressing force is applied. This preliminary signaling allows the load acquiring section to synchronize its measurement window with the actual pressing operation, ensuring productivity is maintained while precision is improved by avoiding vibration contamination.
3Productivity
If load acquisition starts early during conveyance, then productivity is improved by early measurement, but measurement precision deteriorates due to vibration interference
Solution Approach 1:
The system uses feedback from the mounter's control section to determine the optimal timing for load acquisition. The control section monitors the operational state and issues a start command only when the mounting head is ready to apply pressing force, ensuring that measurement begins at the precise moment when valid data can be captured without vibration interference.
Solution Approach 2:
The mounter performs preliminary action by preparing and issuing the start command before the actual pressing force is applied. This preliminary signaling ensures that the load acquiring section is ready to capture data at the exact moment when pressing force begins, maximizing productivity while avoiding early measurement of vibration noise during conveyance.
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
This solution allows for accurate measurement of pressing loads by the mounting head, reducing mistaken measurements and enabling the use of high-sensitivity sensors without recording vibrations as load data.
Implementation Method 1
a load sensor that detects a pressing force (such as a force that presses a component) of the suction nozzle
Data Source
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AI summary
A device that curtails incorrect measuring during pressing load measurement. Load measuring device 81 is provided with load sensor 95, data logger 97, and measurement start switch 99 on body 83. When switch section 95A is pressed down by a suction nozzle, load sensor 95 outputs detection voltage V2 to data logger 97 in accordance with the size of the pressing load. Data logger 97 records detection voltage V2 for a specified time only from the time it starts receiving high level start recording signal S2 from measurement start switch 99. By this, data logger 97 does not record detection voltage V2 until high level start recording signal S2 is received from measurement start switch 99, thus does not incorrectly record vibrations and the like during conveyance as the load.