Electric Tool Current-Based Auto Stop for Fastener Slip Prevention
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Solution Overview
Problem
Existing intelligent electric tools struggle to implement automatic stops under various operating conditions, leading to reduced operating efficiency when driving fasteners into materials like multi-layer steel plates or wood boards, as they often slip if not stopped in time.
Innovation Solution
An intelligent electric tool with a motor, detection unit, and controller that determines first and second detection values based on current values to control the motor's rotation, allowing for precise stopping across different operating conditions, including metal, wood, and drill modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a predetermined position threshold is set to determine whether to stop the electric drill driver, then the stopping position can be controlled, but automatic stop under various operating conditions cannot be achieved and operating efficiency is reduced
Solution Approach 1:
The patent applies dynamics by making the stopping criterion adaptive rather than fixed. The controller dynamically adjusts the stopping decision based on real-time detection of current values and their rates of change, allowing the system to automatically adapt to different operating conditions (metal mode, wood mode, drill mode) without manual intervention, thereby improving both adaptability and operating efficiency
Solution Approach 2:
The patent changes the parameter used for stopping control from a fixed position threshold to dynamic electrical parameters (current values and rates of change). By monitoring how current values change over time and comparing them against threshold values, the system can automatically determine the appropriate stopping point for different materials and conditions, resolving the contradiction between adaptability and efficiency
2Productivity
If the electric drill driver continues operation without timely stopping, then continuous work can be maintained, but the tool may slip and the screw may be loosened affecting fastening quality
Solution Approach 1:
The patent implements feedback control by continuously detecting current values during operation and using this information to automatically control the stopping timing. The controller monitors the real-time electrical state of the motor and adjusts operation accordingly, ensuring the tool stops at the optimal moment to prevent slipping while maintaining continuous productive operation across different fastening scenarios
3Ease of operation
If manual monitoring and stopping is used, then simple control is maintained, but operating efficiency is reduced due to inability to automatically adapt
Solution Approach 1:
The patent applies self-service by enabling the controller to automatically monitor current values, calculate rates of change, compare against thresholds, and determine stopping points without user intervention. The system serves itself by using its own operational parameters (current draw) to make intelligent stopping decisions, thereby maintaining ease of operation while dramatically improving operating efficiency through automatic adaptation to different materials and conditions
Data Source
AI summary
An intelligent electric tool includes an output shaft, a motor, a transmission assembly, an adjustment assembly, a detection unit, and a controller. The output shaft outputs torsion. The motor drives the output shaft to rotate. The transmission assembly connects the motor to the output shaft. The adjustment assembly adjusts an operating mode of the intelligent electric tool, where the operating mode includes at least a metal mode. The detection unit detects a current value of the intelligent electric tool in operation. The controller determines a first detection value and a second detection value according to the current value of the intelligent electric tool in operation and control, according to the first detection value and/or the second detection value, the motor to stop rotating to control the intelligent electric tool to stop.