Gyroscopic Sensor Control for Electric Screwdriver Jerk Mitigation
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Solution Overview
Problem
Existing electric screw joint tightening tools lack flexibility in operation, leading to uncomfortable jerks and reduced ergonomics for operators, especially during high-torque applications, as they rely on fixed control methods that do not adapt to individual operator movements or preferences.
Innovation Solution
An electric screw joint tightening device equipped with a gyroscopic sensor and electronic control unit that detects angular rotation and adjusts motor rotation speed based on operator movements, allowing for customizable tightening speed and jerk mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed control methods are used for tightening speed, then the tightening process is standardized and safe, but operator comfort and flexibility are reduced
Solution Approach 1:
The patent applies dynamics by making the tightening speed adjustable and adaptable rather than fixed. The control system allows operators to dynamically adjust the tightening speed according to their preferences and working conditions, transforming a static process into a dynamic one that balances standardization with operator flexibility and comfort.
2Productivity
If high rotational speed is used during initial threading, then assembly speed is improved, but torque jerk and operator discomfort increase
Solution Approach 1:
The patent applies preliminary action by implementing a preparatory phase before the main tightening operation. The system performs initial threading at high speed, then transitions to a controlled intermediate speed phase that prepares the operator for the upcoming torque increase. This preliminary preparation reduces the harmful torque jerk effect while maintaining high productivity during the initial stage.
Solution Approach 2:
The patent applies periodic action by using controlled speed variations during the tightening process. The system alternates between high-speed initial threading and controlled intermediate speed phases, creating a periodic pattern that manages torque buildup. This periodic speed control prevents sudden torque shocks while maintaining overall assembly efficiency.
3Loss of time
If torque increase is accelerated, then tightening time is reduced, but operator safety and comfort are compromised
Solution Approach 1:
The patent applies preliminary action by creating a controlled intermediate phase before the final high-torque tightening. This preparatory phase at intermediate speed allows the operator to mentally and physically prepare for the upcoming torque increase, reducing the risk of injury while still maintaining relatively fast tightening times. The preliminary action smooths the transition and eliminates sudden shocks.
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
The device provides enhanced ergonomic operation by allowing operators to control tightening speed according to their preferences, reducing jerks and improving comfort during high-torque tasks, thereby increasing operator satisfaction and flexibility.
Implementation Method 1
a gyroscopic sensor and electronic control unit that detects angular rotation
Data Source
AI summary
An electric assembly device for tightening of fastener includes a housing and a rotation. motor which is drivingly connected to an output shaft. The output shaft has a forward portion extending out of the housing, and is adapted to carry a coupling device for releasable coupling with a fastener during tightening, which is to be performed along a first rotation axis. The device is adapted to determine an angular displacement of the housing with respect to the first rotation axis during tightening of the fastener, and to control the rotation speed of the motor during tightening based on the determined angular displacement of the housing.