12 DISC
Design and development of Hydraulically operated Main Winch with 50T single line pull - Arjun ARRV
Problem Statement brief:
a) Double capstan type winch, the rope under tension enters the winch and winds itself on the twin capstan drums, which are grooved for preventing the rope from slipping axially over the drum surface.
b) The rope leaving the capstans with nominal tension and is stored in a winding drum. Drives should be provided to both the capstans which rotate at the same rpm and the storage drum rotating speed needs to be matched with capstan winch by mechanical / hydraulic means.
c) Compact design for better space management inside the Arjun ARRV hull hydrostatic driven storage drum is required. Hydrostatic drives also permit steplessly variable speeds, thereby enabling better operational flexibility and control, particularly when very high loads need inching by the recovery winch.
Challenge brief
a) Hydraulically operated, Double capstan-type with storage drum and Pay-on mechanism.
b) 50 tonne single line Pull with Max. stall pulling force for winch system shall not exceed 60 tonne.
c) Hydraulic system Working Pressure shall be 360 bar (Max.) with Overload protection & Auto Stop Mechanism.
d) Min. Braking force of wire rope should not be less than 100 T, the rope end fixed to the winch rope shall withstand at least 2 times the rated pulling force of 50 tonne and the rope end shall be field replaceable by minimum shortening of rope length, allowing quick deployment.
e) Integrated hydrostatic drive with continuously variable speed control for both winch-in and winch-out.
f) Winch IN - Maximum single line pulling force of 50 tonne shall be achieved at a rope speed >= 7 m/min and Winch OUT Maximum pull force of 2 tonne shall be achieved at a rope speed >= 55 m/min.
g) Compact design to suit within the envelope inside Arjun ARRV.
h) Main Winch shall be complied with JSS-55555, MIL 810F and MIL 2164A.
i) The associated accessories shall include Rope cleaning device & Hour Meter, Essential tools for adjustments, operation & maintenance and Seal kit.
j) Single control system (Pendant with 10m chord) for both Main Winch and Aux. Winch, provision to be made for 2 separate sockets 1 inside the Hull structure & the other at outside the Hull structure, with a fixed instrument panel with LED Indication on Driver Control panel for winches operation
