Impact Wrench Control Method for Expansion Anchor Setting
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Solution Overview
Problem
The existing methods for setting expansion anchors with impact wrenches often result in improper resumption of tightening, which can damage the anchor, due to the lack of precise control over torque transmission and phase management during the setting process.
Innovation Solution
The control method for an impact wrench implements a two-phase sequence for setting expansion anchors, where the first phase estimates the transmitted torque until it exceeds a threshold, and the second phase applies a specified number of rotary impacts to achieve the target torque, with memory storage of premature releases to adjust the resumption process accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the user releases the button during the setting process to take a break, then the user can continue after a short break, but improper resumption of tightening can damage the expansion anchor
Solution Approach 1:
The control unit stores the phase information in memory before the user releases the button. This preliminary recording of the operational state enables the system to resume exactly where it left off, preventing improper resumption that could damage the anchor.
Solution Approach 2:
The system provides feedback to the user about the current phase through the display unit, and uses this feedback to automatically adjust the resumption behavior. When the button is pressed again, the system checks the stored phase information and executes the appropriate continuation action, ensuring reliable resumption.
2Reliability
If the control method implements precise phase management and memory storage, then damage to expansion anchor is prevented, but the device complexity increases
Solution Approach 1:
The control unit automatically manages the phase information and resumption logic without requiring additional external components or complex mechanisms. The system serves itself by using its existing memory and processing capabilities to track and resume the setting phase, minimizing added complexity.
3Measurement precision
If the first phase repeatedly exerts rotary impact to estimate transmitted torque, then accurate torque control is achieved, but the setting time increases
Solution Approach 1:
The system performs a limited number of rotary impacts in the first phase just enough to estimate the transmitted torque with sufficient accuracy. It does not continue excessive impacts, thereby balancing measurement precision with time efficiency.
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 method ensures robust and accurate torque application, preventing damage to the expansion anchor by accounting for interruptions and allowing users to safely continue or restart the setting process, enhancing the reliability of anchor tightening.
Implementation Method 1
the impact mechanism 3 repeatedly exerts angular momentum (rotary impacts) on the output spindle 4
Implementation Method 2
a rotary impact is repeatedly exerted on a screw element of the expansion anchor and a torque transmitted from the rotary impact to the screw head is estimated
Data Source
AI summary
A control method of an impact wrench for setting an expansion anchor carries out a first sequence in response to a button being pressed. In a first phase, a rotary impact is repeatedly exerted on a screw element of the expansion anchor and a torque transmitted from the rotary impact to the screw head is estimated. The first phase S1 is continued until the estimated transmitted torque exceeds a threshold value specified for the expansion anchor. In a second phase, a number of rotary impacts specified for the expansion anchor are exerted on the screw head. If the button is released before the end of the first sequence, a premature release of the button and the phase in which the button was released is stored in a memory. In response to the button being pressed when a premature release is stored in the memory, a second sequence is carried which depends on the phase in which the button was previously released.