This technology is a subway door safety system that equips both door panels with conductive rubber. It detects resistance changes based on the contact area between the two rubber strips to determine if the door has closed properly or if an obstacle is trapped, subsequently controlling the opening and closing mechanism.
Existing subway door sensors are only installed at the top and consider the door closed if the gap is 7.5 mm or less, failing to detect thin objects. Furthermore, the lack of sensors at the bottom means the system cannot detect when items like shoes or stroller wheels are trapped while the top closes, leading to recurring entrapment and crushing accidents.
This technology utilizes the principle that when the door closes properly, the contact area is maximized, resulting in the lowest resistance value; if an object is trapped, a higher resistance value is detected. This allows the system to identify abnormal closures regardless of the object's position or thickness, triggering the door to reopen while providing audible or visual alerts. This device can be applied to door systems in railway vehicles such as subways and electric trains, fundamentally reducing accidents involving passengers' bodies or belongings.
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