Translational Torch Height Controller for Plasma Arc Cutting

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Solution Overview

Problem

Automated plasma arc torches struggle with torch height control during robotic operation, particularly when cutting workpieces with height variations, leading to suboptimal cut quality and potential damage due to fixed torch height settings.

Innovation Solution

A plasma arc torch with a translational torch height controller, featuring a movable part mounted to the torch body and a fixed part connected to a robotic arm, allows for dynamic adjustment of torch height by using a biasing mechanism and balls to maintain contact with the workpiece, enabling smooth drag cutting operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a fixed torch height is used in robotic-controlled plasma arc torches, then the device complexity is reduced and operation is simplified, but the manufacturing precision and cut quality deteriorate when workpieces have height variations

Engineering Contradiction:

Improvetorch height control mechanismVSAvoidcut quality

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent applies the dynamics principle by transitioning from a fixed torch height mechanism to a dynamic adjustment system. The robotic arm is programmed to automatically adjust the torch height based on real-time detection of workpiece surface position, allowing the system to adapt to height variations while maintaining precise cut quality. This resolves the contradiction by making the torch height controllable both简单地 (when workpiece is uniform) and precisely (when workpiece has variations).

Inventive Principle:

Principle #15Dynamics

2Manufacturing precision

If the robotic arm adjusts torch height dynamically, then the cut quality improves for workpieces with height variations, but the operation complexity and control difficulty increase

Engineering Contradiction:

Improvetorch height consistencyVSAvoidcontrol complexity

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The system implements self-service by using automatic detection and control algorithms that enable the robotic arm to autonomously adjust torch height without requiring complex manual intervention. The control system automatically detects workpiece surface position and calculates the required height adjustment, executing the correction independently. This reduces operational complexity while maintaining high precision torch height control.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent employs feedback control by continuously monitoring the workpiece surface position and using this information to adjust the torch height in real-time. The detection system provides feedback signals to the control algorithm, which then modifies the robotic arm's position to maintain optimal torch-to-workpiece distance. This closed-loop feedback mechanism simplifies operation by automating the complex adjustment process.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS9555497B2Translational torch height controller for a plasma arc torch

Publication Date: 2017.01.31 VICTOR EQUIP

AI summary

A plasma arc torch is provided that includes a torch body and a torch height controller. The torch height controller includes a movable part mounted to the torch body and a fixed part connected to a robotic arm. The movable part and the torch body are biased toward a workpiece and are translational relative to the fixed part.