Teaching Pendant Safety Circuit for Reliable Emergency Stop Switching
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Solution Overview
Problem
Current robot and teaching pendant emergency stop systems operate independently, leading to software misjudgments and potential safety hazards due to the lack of a hardware connection, causing unreliable operation and safety issues.
Innovation Solution
A teaching pendant with a multi-stage key switch and enabling switch connected through a hardware circuit, including a safety control device with a transient emergency stop circuit and disconnection loop time, to ensure reliable and safe emergency stop states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If software is used to control the emergency stop state and switch operations, then the system can operate autonomously, but software misjudgment may cause safety failures
Solution Approach 1:
The system separates the emergency stop control into independent hardware circuit segments: the emergency stop switch directly controls the emergency stop circuit, and the multi-stage key switch independently controls mode switching circuits. This segmentation ensures that software failures cannot affect hardware-based safety functions.
Solution Approach 2:
The patent introduces a hardware circuit as an intermediary between the switches and the control system. The emergency stop switch and multi-stage key switch are connected through dedicated hardware circuits that directly interface with the PLC, eliminating software as the sole mediator and preventing software misjudgment from affecting safety operations.
2Device complexity
If the emergency stop switch and teaching pendant switches operate independently without hardware connection, then the system design is simpler, but safety reliability decreases
Solution Approach 1:
The patent merges the emergency stop switch and multi-stage key switch into a unified hardware circuit system. Both switches are physically connected through the PLC's hardware circuitry, creating a combined safety control architecture where both devices work together through shared hardware pathways, ensuring coordinated and reliable operation.
3Adaptability or versatility
If the three-stage key switch and enabling switch are controlled by software judgment, then the system is more flexible, but misoperation risks increase
Solution Approach 1:
The patent implements dynamic hardware-based mode switching through the multi-stage key switch. The switch provides distinct physical positions (first position for manual mode, second position for automatic mode) that dynamically reconfigure the control system's operating state through hardware circuit changes, ensuring that mode transitions are physically certain and cannot be misinterpreted by software.
Data Source
AI summary
The teaching equipment of an electromechanical system provided by the present invention is used to connect an emergency stop loop of electromechanical equipment, including a multi-stage key switch, an enabling switch and a safety control device. The multi-stage key switch is used to switch between a first mode and a second mode. The multi-stage key switch generates a switching signal during switching. The enabling switch is connected to the emergency stop loop. The safety control device is used to receive the switching signal. The safety control device includes a transient emergency stop circuit and a disconnection loop time. The safety control device triggers the emergency stop loop to enter the emergency stop state according to the switching signal. The emergency stop state includes that the transient emergency stop circuit interrupts the emergency stop loop until the disconnection loop time is up.