Automatic Door Pneumatic Pressure Control After Emergency Stop
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Solution Overview
Problem
Pneumatic control systems for auto doors in machine tools experience sudden acceleration after an emergency stop, compromising controllability during restarts.
Innovation Solution
A pneumatic control device with a first directional control valve, door detection sensors, and second directional control valves that manage compressed air exhaust speed to prevent sudden acceleration by switching positions based on the door's state and generating signals for controlled deceleration after an emergency stop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the compressed air supply to the door cylinder is quickly restored after an emergency stop, then the door can resume operation faster, but sudden acceleration occurs compromising controllability
Solution Approach 1:
The system performs preliminary detection of the door's current state (open/closed position) before restoring compressed air supply after an emergency stop. Based on this detection, the control unit preliminarily determines the appropriate exhaust speed setting, preventing sudden acceleration by preparing the correct control parameters in advance before the door operation resumes.
Solution Approach 2:
The system dynamically adjusts the exhaust speed of compressed air based on the detected door state. The second directional control valves can switch between different positions to provide different exhaust speeds, allowing the system to adapt the air supply characteristics to the actual door position and operational requirements, thereby maintaining controllability during restart.
2Ease of operation
If the exhaust speed of compressed air is reduced to prevent sudden acceleration, then door controllability improves, but the time to complete door opening/closing operations increases
Solution Approach 1:
The system uses dynamic switching of the second directional control valves to provide different exhaust speeds at different stages of door operation. When the door is in positions requiring precise control (not completely open or closed), the valves reduce exhaust speed to prevent sudden acceleration. When the door reaches completely open or closed positions, the valves can maintain higher exhaust speeds, thus minimizing the overall operation time while ensuring controllability when needed.
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 sudden acceleration of the door during system restarts by gradually reducing compressed air exhaust speed, ensuring smooth operation and maintaining controllability.
Implementation Method 1
second directional control valves installed in the first and second exhaust lines respectively to operably exhaust the compressed air exhausted from the first and second outlet ports according to an emergency stop signal, and capable of changing positions to reduce an exhaust speed of the compressed air
Implementation Method 2
a door detection sensor configured to detect an open/close state of the door
Implementation Method 3
a first directional control valve configured to control a direction of a compressed air supplied to a door cylinder for opening and closing a door
Data Source
AI summary
A pneumatic control device of auto door includes a first directional control valve configured to control a direction of a compressed air supplied to a door cylinder for opening and closing a door, a door detection sensor configured to detect an open/close state of the door, first and second exhaust lines respectively connected to first and second outlet ports of the first directional control valve, and second directional control valves installed in the first and second exhaust lines respectively to operably exhaust the compressed air exhausted from the first and second outlet ports according to an emergency stop signal, and capable of changing positions to reduce an exhaust speed of the compressed air in case that the door is not completely open or closed when an operation signal is generated after the emergency stop signal.