Semi Permanent Coupler
SONA Comstar make Semi-Permanent Couplers are assembled and used for the EMU / DMU / MEMU coaches of the Indian Railways. In Semi-permanent couplers the coupling is done manually and the two couplers after being aligned are secured by an adjustable cup sleeve joint. During the process of manual coupling the air pipe connections (MR & BP) between the two coaches are established automatically.
Principle Design Features:
- • Horizontal articulation (±13°) and Vertical articulation (±5°)
- • Semi-permanent coupler is designed for taking up a static compressed load of 100 tons and tensile load of 70 tons.
- • The dynamic absorption capacity of the rubber draft gear of these couplers is 800 m-kg.
- • Reduced play at coupling junction due to rigid coupling connection using adjustable cup-sleeve and hence less appreciable wear and tear during train operation.
- • Due to high draft capacity incorporated in semi-permanent couplers, it allows coaches to buffer at higher speeds (from 3 km/hr to 15 km/hr) without any damage to the coach.
- • The design and construction of the pivoted joint between these couplers & coach allows vertical deflection of ±75mm and horizontal deflection of 284 mm.
- • Mechanically controlled mechanism to control BUFF (Compression), DRAW (Tensile) stroke & articulations during Train application.
- • The interlocking arrangement of these couplers prevents the telescoping of the coaches at some extent when involved in accidents & prevents overriding of coaches.
Salient Features
- • Prevents overriding of coaches
- • Draw and buff gear absorbs 8 kJ
- • Rigid and slack free connection
- • Jerk-free start and braking during acceleration and deceleration
- • Provides the automatic pneumatic connection for BP & FP lines.
Applications
- • EMU, MEMU and DEMU
- • Any other suburban/mass rapid transport system
- • Indian Railways
- • MRVC
References