Impact Tool Control Unit for Screw Come-Out Prevention
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Solution Overview
Problem
Existing impact tools require manual adjustment of rotational velocity by the operator, which can lead to inefficient operation and increased risk of the 'come-out' phenomenon during screw fastening.
Innovation Solution
The impact tool incorporates a control unit that autonomously adjusts the rotational velocity of the output shaft based on measured angular lead and thrusting force, employing come-out reduction and stabilization controls to prevent unintended disengagement and stabilize the hammer's behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the worker manually operates the impact tool to adjust rotational velocity, then the tool can be operated, but the operation becomes complex and requires skilled delicate control
Solution Approach 1:
The control unit automatically adjusts the rotational velocity of the output shaft based on the working situation without requiring manual intervention. The system monitors operational parameters and autonomously optimizes rotational velocity, eliminating the need for skilled delicate control by the worker while maintaining optimal performance.
Solution Approach 2:
The control unit continuously monitors the working situation and adjusts the rotational velocity based on feedback from operational conditions. This closed-loop control system automatically responds to changes in load, torque, and operational state, replacing manual adjustment with automated feedback-driven control.
2Productivity
If the impact tool operates at high rotational velocity, then productivity increases, but the risk of come-out phenomenon increases
Solution Approach 1:
The control unit dynamically adjusts the rotational velocity based on real-time monitoring of operational parameters. When the come-out phenomenon is detected or anticipated, the system automatically reduces rotational velocity to prevent screw disengagement. This dynamic adjustment allows the tool to operate at high speeds during normal conditions while automatically slowing down when reliability concerns arise, thus resolving the contradiction between productivity and reliability.
Data Source
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AI summary
An object of the present disclosure is to provide an impact tool with the ability to control the rotational velocity of an output shaft autonomously according to a working situation. An impact tool (1) includes a motor (3), an impact mechanism, an output shaft, a control unit (7), and an angular lead measurer (9A). The impact mechanism includes a hammer and an anvil. The anvil rotates upon receiving impacting force from the hammer. The angular lead measurer (9A) measures an angular lead in rotation of the anvil over the hammer. The control unit (7) changes, according to the angular lead measured by the angular lead measurer (9A), a control mode for controlling the rotational velocity of the output shaft from one of a plurality of modes to another.