Edge Detection Probe Using Air Pressure Drop for Torch Crash Prevention
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Solution Overview
Problem
Mechanical torch height sensing and control systems in thermal cutting machines fail to prevent unintended contact between the cutting torch and the workpiece when the height sensing probe moves off the edge of a warped or irregular metal plate, leading to torch crashes.
Innovation Solution
A vertically free floating probe with an air outlet connected to a pressurized air source and pressure sensor is used to monitor air pressure changes as it moves off the plate edge, generating a signal to halt the torch's downward movement and maintain the desired height, employing an ellipsoidal shape for smooth transition and minimal height loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a vertically free floating probe is used to sense plate surface irregularities, then the torch height can be maintained above warped plates, but the probe moves off the plate edge causing the torch to crash into the plate
Solution Approach 1:
A pneumatic intermediary system is introduced between the probe and torch control. Pressurized air is supplied through the probe to a pressure sensor, creating an indirect detection mechanism. When the probe is on the plate, air pressure is maintained; when the probe moves off the plate edge, pressure drops trigger a signal to halt torch downward movement, preventing crashes while maintaining height control during normal operation
Solution Approach 2:
A feedback control system is implemented using pressure sensor signals. The pressure sensor continuously monitors air pressure through the probe and provides real-time feedback to the torch control system. When pressure drops indicate probe edge movement, the feedback signal automatically adjusts torch height to prevent crashing, creating a closed-loop control system that resolves the contradiction between height maintenance and crash prevention
2Manufacturing precision
If the probe is positioned close to the torch for accurate height sensing, then manufacturing precision improves, but the probe is subject to damage from cutting heat
Solution Approach 1:
The height sensing function is segmented from the torch assembly. The probe is mounted on a separate vertically free-floating mechanism independent of the torch. This segmentation allows the probe to be positioned close to the torch for accurate sensing while being physically isolated from cutting heat, as the probe operates on its own vertical slide without direct thermal exposure
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
Prevents torch crashes by maintaining the desired gap between the torch and workpiece, ensuring accurate cutting path and minimizing height loss during edge detection, while allowing the probe to smoothly return to the plate surface.
Implementation Method 1
An air supply is operatively connected to the probe and provides a monitored flow of pressurized air through the probe and directly to the surface of the workpiece. An air pressure sensor is operative to sense a decrease in the pressurized air as the probe moves off an edge of the workpiece
Data Source
AI summary
An edge detect system, using a torch height control system based on the use of a free floating probe in contact with the workpiece, uses a drop in pressurized air supplied to the probe tip in contact with the workpiece when the probe moves off the plate edge to generate a signal that prevents the torch from following the free floating probe downwardly and thereby prevents the cutting tool from crashing into the workpiece.