Pipe Threading Control Using End-of-Thread and Torque Feedback
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Solution Overview
Problem
Conventional hand-held power drives for pipe threading require operators to manually monitor the end of the pipe during threading, which can lead to uncertainty and loss of control, especially for less skilled users, due to difficulty in seeing the end of the pipe during die head rotation and potential for excessive torque transmission.
Innovation Solution
A method using a tool with an electric motor, angular velocity sensor, and controller to measure and compare electrical current and motor rotations, providing an end-of-thread alert and automatically controlling the tool to prevent over-threading and loss of control, featuring a gyroscopic sensor for detecting excessive rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual monitoring of pipe end during threading is used, then operator control flexibility is maintained, but thread completion accuracy deteriorates due to difficulty in seeing the pipe end during die head rotation
Solution Approach 1:
The system incorporates sensors that detect the position of the pipe end relative to the die head and provide real-time feedback signals to the control system. This automated feedback mechanism enables precise determination of thread completion without requiring the operator to visually monitor the pipe end, thereby improving measurement precision while maintaining operational simplicity through automatic control adjustments.
Solution Approach 2:
The patent replaces the manual visual monitoring mechanism with an automated sensor-based detection system. Optical or positional sensors substitute for the operator's eyes, and electronic control systems replace manual operational adjustments, enabling precise thread completion detection without compromising operator control through automated position adjustment and timing control.
2Device complexity
If support arm is not used to counteract torque, then device complexity is reduced, but operator safety deteriorates due to potential excessive torque transmission
Solution Approach 1:
The control system incorporates torque sensors that continuously monitor the torque being applied during threading operations. When the detected torque approaches predetermined safety thresholds, the system automatically provides feedback signals to reduce motor power output or shut down the threading operation, thereby preventing excessive torque transmission without requiring additional mechanical support structures.
Solution Approach 2:
The system dynamically adjusts operational parameters including motor power output, rotational speed, and feed rate based on real-time torque conditions. By automatically modifying these parameters in response to torque levels, the system maintains safety without requiring the added complexity of support arms, effectively managing torque through electronic parameter control rather than mechanical counterbalancing.
3Manufacturing precision
If automated control system is implemented, then thread completion accuracy is improved, but device complexity increases due to addition of sensors and control circuits
Solution Approach 1:
The control system is designed to perform multiple functions using integrated circuits that combine threading control, torque monitoring, position detection, and safety management in a single unified system. This multi-functionality reduces the need for separate dedicated components for each function, thereby achieving high thread completion accuracy without proportionally increasing overall device complexity.
Solution Approach 2:
The patent merges the control functions for motor operation, sensor data processing, torque management, and thread completion detection into an integrated control unit. By combining these functions into a single coordinated system rather than separate independent systems, the achieved manufacturing precision is maintained while the increase in device complexity is minimized through functional integration.
4Productivity
If higher torque is applied to thread pipe faster, then productivity is improved, but operator safety deteriorates due to increased risk of loss of control
Solution Approach 1:
The control system dynamically adjusts torque and rotational speed based on real-time operating conditions and detected pipe characteristics. Rather than applying constant high torque, the system optimizes torque delivery dynamically, increasing it when appropriate for productivity while automatically reducing it when safety thresholds are approached, thereby achieving high threading speed without compromising operator safety.
Solution Approach 2:
The system incorporates real-time monitoring of torque, rotational speed, and operational conditions with automatic feedback control. When the system detects conditions that may lead to loss of control or excessive torque, it automatically adjusts power delivery and operational parameters to maintain safety while preserving productivity through optimized torque application rather than constant maximum torque.
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 solution ensures accurate thread completion, reduces operator risk, and enhances consistency by providing an end-of-thread alert and automatic control, minimizing the likelihood of over-threading and torque-related issues.
Implementation Method 1
featuring a gyroscopic sensor for detecting excessive rotation
Data Source
AI summary
Various methods are described for forming threads in a workpiece, and particularly for controlling and/or monitoring threading of workpieces. Also described are tools and a system used in performing the methods.