Slip Clutch Release Detection in Power Tools Using Speed Feedback
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Solution Overview
Problem
Conventional power tools with mechanical slip clutches experience significant wear and reduced performance over time due to frequent slip clutch releases, leading to increased downtimes and a lack of reliable data on release events, which hampers their operational efficiency and maintenance.
Innovation Solution
A method utilizing sensors to detect slip clutch release events by monitoring speed and current values, allowing for the collection and evaluation of reliable data on release events, and enabling timely maintenance by identifying devices with high slip clutch activity, which includes using a power tool with a motor, control device, gear device, and sensors to determine the state of the slip clutch and adjust operations accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical slip clutch is used in power tools, then protection against overload is achieved, but wear and reduced performance occur over time due to frequent release events
Solution Approach 1:
The patent replaces the purely mechanical slip clutch system with a hybrid system that incorporates electronic sensors (speed sensors, current sensors) and a control device. The control device monitors operational parameters and can detect slip clutch release events, enabling electronic intervention to reduce mechanical wear while maintaining the protective function against overload.
Solution Approach 2:
The patent implements a feedback mechanism where sensors continuously monitor the operational state of the power tool, including speed and current values. When a slip clutch release event is detected, this information is fed back to the control device, which can then adjust operations or alert the user, preventing further wear from undetected release events.
2Device complexity
If slip clutch release events are not monitored, then device complexity is reduced, but reliable data on release events is unavailable for maintenance planning
Solution Approach 1:
The power tool is equipped with sensors and a control device that automatically monitor and record slip clutch release events without requiring external intervention. The system self-detects release events by comparing speed and current values, automatically stores this information, and can provide maintenance alerts, enabling proactive maintenance planning while keeping the interface simple for the user.
3Productivity
If automatic feed devices are used with power tools, then productivity is increased, but process interruption occurs when slip clutch releases
Solution Approach 1:
The control device receives feedback from sensors about slip clutch release events and can respond by adjusting the automatic feed device's operation. When a release event is detected, the system can pause the feed, alert the user, or adjust parameters to prevent immediate re-release, minimizing process interruption and maintaining productivity.
Solution Approach 2:
The system continuously monitors operational parameters before a slip clutch release occurs. By detecting early signs of overload or abnormal conditions through sensor data, the control device can take preliminary actions such as adjusting feed rates or alerting the operator, preventing the slip clutch release before it interrupts the automatic feed process.
Data Source
AI summary
A method for detecting whether a slip clutch release event has taken place in a power tool includes determining a first speed of a gear device by a first sensor, determining a second speed of a motor by a second sensor, and determining a current value by a third sensor. The method further includes determining a state of the power tool by using the first and second speeds and the current value, determining a state of the gear device in dependence on the current value by a control device, ascertaining a state of activity of the slip clutch in dependence on the first and second speeds by the control device, and ascertaining by the control device by a combination of the state of the gear device and the state of activity of the slip clutch whether the slip clutch release event has taken place.