Robot Power-On Safety Confirmation for Access Door Interlocks
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Solution Overview
Problem
Existing robot systems lack robust safety measures, particularly when power is turned ON, and there is a risk of operation with open covers, leading to potential human contact and reduced productivity due to unnoticed open states.
Innovation Solution
A control system with a robot control apparatus that includes a safety confirmation signal acquisition section and a notification signal output section to ensure safe operation by requiring safety confirmation before power is supplied, using a safety fence system and a transmission apparatus to verify the closed state of an access door and generate notifications if confirmation is not met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the interlock operates only when the cover is open during operation, then the robot can be controlled to stop, but the robot may still operate erroneously when power is turned ON with the cover open
Solution Approach 1:
The system performs preliminary safety checks when power is turned ON by acquiring a safety confirmation signal before permitting robot operation. This preliminary action ensures that the cover is properly closed before the robot can operate, preventing erroneous operation while maintaining simple control logic.
Solution Approach 2:
The system uses feedback from the cover position detection to control robot operation. When the cover is detected as open, the system generates a notification signal and prevents operation. This feedback mechanism ensures safety without requiring complex interlock systems, resolving the contradiction between safety and complexity.
2Reliability
If the operator does not notice when the cover is not completely closed, then the robot may stop for a long period, but this reduces productivity
Solution Approach 1:
The system continuously monitors the cover position and provides immediate feedback through notification signals when the cover is not properly closed. This feedback mechanism alerts the operator instantly, preventing long stoppages and maintaining productivity while ensuring safety.
Solution Approach 2:
The notification signal output section uses visual indicators (such as LED color changes) to alert operators of safety issues. This provides immediate and attention-grabbing feedback, ensuring operators notice cover status problems quickly and restore operation promptly.
3Loss of information
If a notification signal is generated whenever safety confirmation is required, then operator awareness is improved, but the system complexity increases
Solution Approach 1:
The notification function is extracted as a separate, simple module that generates signals based on cover position detection. This extraction allows the notification system to be added with minimal complexity, providing operator awareness without burdening the main control system.
Solution Approach 2:
The system automatically generates notification signals based on its own safety monitoring functions, eliminating the need for separate complex alert systems. The control apparatus serves itself by using its existing sensors and logic to trigger appropriate notifications, minimizing added complexity.
Data Source
AI summary
There is provided a control system includes: a robot control apparatus that controls an operation of a robot having a robot arm; and a transmission apparatus that transmits a safety confirmation signal indicating that it is confirmed that the robot is configured to be operated safely to the robot control apparatus, in which the robot control apparatus includes a safety confirmation signal acquisition section that acquires the safety confirmation signal, and a notification signal output section that generates and outputs a notification signal for notifying that safety confirmation is required until the safety confirmation signal acquisition section acquires the safety confirmation signal when power is supplied to the robot control apparatus.