Impact Rotary Tool Stroke Detector Abnormality Detection
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Solution Overview
Problem
Existing impact rotary tools face challenges in accurately determining abnormalities in stroke detectors without the motor being driven, leading to potential disconnection issues and ineffective torque management.
Innovation Solution
Incorporating a voltage detector to assess the stroke detector's functionality while the motor is not rotating, allowing the controller to determine abnormalities and prevent motor rotation in case of issues, thereby ensuring accurate detection and preventing disconnection-related failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the stroke detector is disposed near the hammer for effective stroke detection, then the detection accuracy is improved, but the lead wire connected to the stroke detector may disconnect due to impact
Solution Approach 1:
The patent introduces an abnormality determination unit that acts as an intermediary between the stroke detector and the control system. This unit monitors the stroke detector's output signals and determines abnormalities without requiring the stroke detector to be positioned in high-impact areas, thus protecting the lead wire while maintaining detection functionality through signal mediation
2Reliability
If the abnormality determination is performed after motor operation, then the stroke detector can be tested under working conditions, but torque management is not performed on screws fastened by previous motor operation
Solution Approach 1:
The patent implements preliminary abnormality determination by checking the stroke detector's status before motor operation begins. The abnormality determination unit assesses whether the stroke detector is functioning properly prior to fastening operations, ensuring that torque management can proceed without interruption while maintaining detection reliability through pre-operational verification
3Measurement precision
If a torque measurement means is provided to the output shaft for direct fastening torque measurement, then the accuracy of torque management is improved, but the cost and size of the tool increase
Solution Approach 1:
The patent replaces direct mechanical torque measurement means on the output shaft with an electrical/electronic detection system. The stroke detector uses electrical signals to monitor stroke characteristics and infer fastening torque indirectly, substituting complex mechanical measurement mechanisms with simpler electronic sensing that achieves comparable measurement precision without increasing device complexity
Data Source
AI summary
An impact rotary tool includes: an impact mechanism that applies stroke impact to an output shaft by an output from a motor; a stroke detector that detects a stroke by the impact mechanism; a controller that stops rotation of the motor based on the detection result by the stroke detector; and a voltage detector that detects a voltage in the stroke detector. The controller determines whether the stroke detector has an abnormality based on the voltage detected by the voltage detector while the motor is not rotating. An informing unit informs a user that an abnormality is occurring when the controller determines an abnormality in the stroke detector.