Impact Tool Motor Speed Control via Elastic Grip Detection
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Solution Overview
Problem
Existing impact tools lack efficient control mechanisms to differentiate between loaded and unloaded states during operation, leading to inefficient power usage and potential damage from uncontrolled motor speed.
Innovation Solution
The impact tool incorporates a detection mechanism using a movable member and a Hall sensor to detect the relative movement between the tool body and the elastically-connected grip part, allowing the control part to adjust the motor speed based on the detection results, ensuring optimal speed in both loaded and unloaded states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor is controlled to be driven at high speed without load detection, then the productivity is improved, but the motor may be damaged due to uncontrolled speed in unloaded state
Solution Approach 1:
The patent employs a detection mechanism that includes a movable member and a detector to sense the relative movement between the tool body and elastically-connected part. This feedback system provides real-time information about the loaded state to the control part, which then adjusts motor speed accordingly - maintaining high speed when loaded for productivity while reducing speed when unloaded for protection.
2Reliability
If the motor is controlled to be driven at low speed in unloaded state, then the motor protection is improved, but the productivity decreases due to insufficient speed
Solution Approach 1:
The patent implements dynamic speed control where the motor operating speed is not fixed but varies based on real-time detection of the loaded state. The control part dynamically adjusts the motor speed - operating at low speed during unloaded states for protection and automatically increasing to high speed when loading is detected, thus resolving the contradiction between protection and productivity.
3Measurement precision
If a detection mechanism is added to detect loaded state, then the motor control precision is improved, but the device complexity increases
Solution Approach 1:
The patent introduces an elastically-connected part as an intermediary element between the tool body and the external environment. This elastic connection naturally transmits mechanical movement when loading occurs, which is then detected by a relatively simple detector. This approach achieves precise loaded state detection without requiring complex sensing systems, as the elastic part acts as a mechanical mediator that converts loading conditions into detectable movement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables efficient power management by maintaining low speed in unloaded states and increasing speed when loaded, reducing wear and tear, and enhancing operational safety.
Implementation Method 1
The detecting mechanism includes a movable member and a detector. The movable member is provided in one of the tool body and the elastically-connected part. The movable member is configured to be moved by relative movement of the other of the tool body and the elastically-connected part in the front-rear direction. The detector is provided in the one of the tool body and the elastically-connected part. The detector is configured to detect pressing of the tool accessory by detecting movement of the movable member.
Data Source
AI summary
An impact tool includes a motor, a driving mechanism, a tool body, an elastically-connected part elastically connected to the tool body to be movable at least in a front-rear direction relative to the tool body, a detecting mechanism configured to detect pressing of a tool accessory against a workpiece, and a control part configured to control driving of the motor based on a detection result of the detecting mechanism. The detecting mechanism includes a movable member that is provided in one of the tool body and the elastically-connected part and configured to be moved by relative movement of the other of the tool body and the elastically-connected part in the front-rear direction, and a detector that is provided in the one of the tool body and the elastically-connected part and configured to detect rearward pressing of the tool accessory by detecting movement of the movable member.