Impact Tool Handle Detection Control
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Solution Overview
Problem
Hand-held impact tools face challenges in managing reaction torque during drilling operations, particularly when the auxiliary handle is not attached, leading to potential excessive rotation and reduced user safety.
Innovation Solution
The hand-held impact tool incorporates a detection system that includes a handle-detection switch and a mode-switching mechanism, allowing the tool to adjust its operation based on whether the auxiliary handle is attached, thereby controlling the motor's speed and mode of operation to prevent excessive rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the auxiliary handle is not attached during drilling operation, then the tool can be operated with one hand, but excessive rotation may occur due to large reaction torque
Solution Approach 1:
The control part performs preliminary action by detecting the auxiliary handle attachment status before the drilling operation begins. Based on this detection, the control part pre-adjusts the motor operation parameters (such as limiting rotation speed or torque) to prevent excessive rotation from occurring during the operation, thereby ensuring control stability while allowing one-hand operation when the auxiliary handle is not attached.
2Productivity
If the motor operates at high speed for efficient drilling, then productivity increases, but the risk of excessive rotation increases when auxiliary handle is not attached
Solution Approach 1:
The control part dynamically adjusts the motor operation parameters based on the real-time detection of auxiliary handle attachment status. When the auxiliary handle is detected as not attached, the control part automatically reduces the motor speed or limits the torque output to prevent excessive rotation. When the auxiliary handle is attached, the motor can operate at full speed for high productivity. This dynamic adjustment resolves the contradiction between productivity and safety.
3Power
If the tool provides full power for hammer mode operation, then drilling efficiency is maximized, but user safety is compromised when auxiliary handle is missing
Solution Approach 1:
The control part implements feedback control by continuously monitoring the auxiliary handle attachment status through the detection part. Based on this feedback information, the control part automatically adjusts the motor output power and torque characteristics. When the auxiliary handle is not attached, the control part limits the motor output to reduce reaction torque and prevent excessive rotation. When the auxiliary handle is attached, full power is provided for efficient hammer mode operation. This feedback mechanism resolves the contradiction between power output and user safety.
Data Source
AI summary
A hand-held impact tool includes a motor, a driving mechanism, a tool body, a main handle, a first detection part, a second detection part and a control part. The tool body is configured such that an auxiliary handle is removably attached thereto. The main handle is connected to the tool body. The first detection part is configured to detect selected one of a plurality of modes. The second detection part is configured to detect whether or not the auxiliary handle is attached to the tool body. The control part is configured to control operation of the impact tool based on detection results of the first detection part and the second detection part.