Robot Gas Spring Maintenance via Pressure Decay Monitoring
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Solution Overview
Problem
Existing gas spring maintenance systems in robots fail to accurately detect abnormal gas pressure decreases, leading to inefficient maintenance and prolonged downtime due to unclear differentiation between normal and abnormal leakage rates.
Innovation Solution
A maintenance management apparatus that includes a gas pressure measuring unit, a maintenance judgement unit, and a notifying unit, which measure gas pressure regularly, calculate the rate of decrease, and send notifications to operators for appropriate maintenance actions based on predetermined thresholds, distinguishing between normal and abnormal seal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas pressure is monitored continuously to detect abnormalities, then maintenance reliability is improved, but device complexity increases due to additional sensing and evaluation systems
Solution Approach 1:
The gas spring system performs self-diagnosis by monitoring its own gas pressure and automatically determining whether maintenance is needed. The evaluation unit within the gas spring assembly assesses seal performance based on pressure changes without requiring external inspection systems, enabling the component to service itself.
Solution Approach 2:
The system performs preliminary monitoring of gas pressure changes before actual failure occurs. By continuously tracking pressure and comparing it against threshold values, the system identifies potential issues early and triggers maintenance notifications in advance, preventing sudden failures and improving reliability.
2Measurement precision
If detailed monitoring of gas pressure changes is implemented, then measurement precision is improved, but loss of time increases due to frequent measurements and data processing
Solution Approach 1:
The system monitors changes in gas pressure parameters over time and uses these parameter changes to determine seal performance. By tracking the rate of pressure decrease and comparing it against predetermined thresholds, the system achieves precise measurement of seal condition without requiring excessive measurement frequency, thus balancing precision with time efficiency.
3Device complexity
If manual inspection methods are used, then device complexity is reduced, but productivity decreases due to prolonged downtime and inefficient maintenance scheduling
Solution Approach 1:
The system implements a feedback mechanism where gas pressure data is continuously collected, evaluated against threshold criteria, and used to generate maintenance notifications. This closed-loop feedback system automatically triggers maintenance actions based on actual seal performance, eliminating the need for manual inspections and enabling proactive maintenance scheduling that improves productivity.
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
Enables timely and appropriate maintenance decisions, reducing downtime by accurately identifying the need for gas charging or replacement, and allowing for planned maintenance based on the rate of gas pressure decrease.
Implementation Method 1
A gas spring has a cylinder for enclosing a gas and a piston rod for compressing the gas inside the cylinder, and generates a repulsion force by compression of the gas
Implementation Method 2
a gas pressure measuring unit that measures a gas pressure inside the gas spring on a regular basis
Data Source
AI summary
A maintenance management apparatus manages maintenance of a gas spring provided in an arm of an articulated robot and includes a gas pressure measuring unit that measures a gas pressure inside the gas spring on a regular basis, a maintenance judgement unit that judges whether an abnormality is present in the gas spring based on an amount of decrease in the gas pressure per unit time or per unit operating distance, and a notifying unit that sends a notification based on a judgment result by the maintenance judgement unit to an operator.