Platform Screen Doors
ProductOverview
Platform screen doors (PSDs) are automatic sliding barriers installed along the metro or rapid-transit platform edge. When the train arrives and stops, the PSDs open in synchronisation with the train doors. When the train is about to depart, the PSDs close, sealing the platform and ensuring no passengers can fall onto the tracks.
How it works
The Frame Assembly is welded to the platform edge. Two sliding glass doors run on overhead rails, their motion driven by a Sliding Motor Drive. The motor turns a timing belt, linked to both door carriages via pulleys, ensuring both doors move in sync.
The Control & Synchronisation System is a safety-rated PLC that communicates with the train's door control system. When the train arrives, the platform control sends an "open" command. The PSD Controller Board energises the motor, and door rollers ride the rails smoothly.
Infrared obstruction sensors on each door edge are monitored continuously. If detected, the door immediately reverses and opens further, preventing entrapment.
Bill of materials for Platform Screen Doors
7 top-level lines as of r128112| # | Item / sub-assembly | Part no. | Qty/assy | Ext. qty | Parts | Type |
|---|---|---|---|---|---|---|
| 1 | Frame Assembly 4 parts | platform-screen-doors-frame-structure | 1× | 1 | 0 | assembly |
| 2 | Sliding Glass Door Assemblies 4 parts | platform-screen-doors-door-panels | 1× | 1 | 0 | assembly |
| 3 | Sliding Motor Drive 4 parts | platform-screen-doors-drive-unit | 1× | 1 | 0 | assembly |
| 4 | Door Rail & Guidance 3 parts | platform-screen-doors-guide-system | 1× | 1 | 0 | assembly |
| 5 | Control & Synchronisation System 3 parts | platform-screen-doors-control-logic | 1× | 1 | 0 | assembly |
| 6 | Safety Sensor Package 3 parts | platform-screen-doors-safety-sensors | 1× | 1 | 0 | assembly |
| 7 | Emergency Release Mechanism 3 parts | platform-screen-doors-emergency-release | 1× | 1 | 0 | assembly |
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