Describe about Mooring Winch Operation.

The main parts of a mooring winch includes a winch barrel or a drum, a warp end and a driving motor.

 

• Construction :

1. Winch drum - where cable or rope wound around it. 
2. The winch drum and warp end is driven with the help of a motor drive.
3. All these parts are supported with the help of a substantial frame, which also support a band brake, clutch and geared drives.
4. The motor drive is connected to the barrel and warp end using a spur gear transmission system.
5. The transmission system is also provided with a clutch and a band brake. Thus, the spur gear transmission system controls both the barrel and the warp end.
6. The warp end acts like a locking device, which prevents the rope from sliding off the barrel when pulled excessively. Warp end is extremely important for moving the ship along the berth for alignment purposes. This is done by fastening one end of the ropes or wires to the bollards on the shore and the other end around the warp end of the winch.

• Working function:

1. In mooring winch, main object to rotate the drum in forward and reverse direction with variable speed.
2. For this reason, a constant speed electric motor driven p/p is used to create the press. in line. 
3. Press. in the line confirm the speed of the drum, which is controlled by a solenoid operated by-pass v/v. (a relief arrangement is there to protect the system from over press.)
4. A controller arrangement used to rotate the drum in both direction (F&R), which is done in a v/v block (spool v/v- 3 position 4-port control v/v)
5. Appropriate control of the drum movement is done by brakes. Band brakes are provided to stop the drum whenever required.