Impact Tool Fastening Detection Using Hammer Advance Angle
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Solution Overview
Problem
Existing impact tools may incorrectly determine that a fastening part is properly fastened when it is not, due to inability to assess the direction of fastening accurately.
Innovation Solution
An impact tool equipped with a measurer to measure hammer advance angle per strike, a determiner to compare the angle against a threshold in a reference database, and a presenter to indicate anomalous fastening when determined.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only torque amount is measured to determine fastening state, then the determination process is simple, but the accuracy of determining fastening state deteriorates because directionality cannot be assessed
Solution Approach 1:
The fastening state determination is segmented into two independent assessment dimensions: torque amount evaluation and hammer advance angle evaluation. Each dimension is assessed separately using its own measurement mechanism and judgment criteria, then combined to determine the overall fastening state. This segmentation allows accurate directional assessment without overwhelming complexity.
Solution Approach 2:
The measurement approach transitions from one-dimensional torque measurement to two-dimensional assessment by adding hammer advance angle measurement. This dimensional expansion enables simultaneous evaluation of both torque magnitude and fastening directionality, resolving the contradiction between measurement simplicity and accuracy.
2Measurement precision
If hammer advance angle measurement is added to assess fastening direction, then fastening state determination accuracy improves, but measurement and device complexity increases
Solution Approach 1:
The hammer advance angle measurement serves as an intermediary indicator that indirectly reflects the fastening direction and contact state between the hammer and anvil. By measuring this intermediate parameter, the system can infer the fastening state without directly measuring complex contact forces or positions.
Solution Approach 2:
The system replaces complex mechanical sensing of contact forces and positions with angular measurement of the hammer's motion trajectory. This substitution simplifies the measurement mechanism while providing sufficient information to determine fastening directionality and state.
3Extent of automation
If reference database with threshold is used for determination, then automated decision-making is enabled, but adaptability to different fastening conditions decreases
Solution Approach 1:
The reference database and threshold values are designed to be dynamic and configurable rather than fixed. The system can adapt threshold values and measurement criteria based on different fastening conditions, tool types, and application requirements, maintaining automation while enabling versatility through parameter adjustment.
Data Source
AI summary
An impact tool includes: a measurer that measures a hammer advance angle per strike for a target part; a determiner that uses a predetermined reference database including a threshold to determine whether the hammer advance angle measured by the measurer is an angle corresponding to normal fastening or an angle corresponding to anomalous fastening based on the threshold; and a presenter that presents information indicating anomalous fastening when the determiner determines that anomalous fastening has been applied.