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What is the difference between towing winches and the anchor windlass in the marine field

302 Published by admin 7月 12,2019

What is the difference between towing winches and the anchor windlass in the marine field?

The biggest difference is effect:The towing winches is used in towing operations,but The windlass is used for lifting anchor, anchoring and mooring 

Hydraulic Towing Winch

Towing Winches

The towing winches belongs to a kind of ship winch, which is a machine specially used for towing and towing. It is widely used in tug, anchor supply ship, PSV and other work ships, and it has a very large pulling force, usually with a tonnage of at least 45 tons and a maximum of 500 tons.

According to the driving mode, the towing machine can be divided into steam engine towing machine, diesel engine towing machine, electric towing machine and electro-hydraulic towing machine.It can be divided into automatic towing winches and non-automatic towing winches according to the different operation and control modes.

yacht hydraulic windlass

single windlass

When towing the towing machine, if the sea level is calm and the towed vessel follows the track of the towed vessel at a certain speed, the constant tension received in the towing cable is constant;When there is wind and waves, the relative speed between the tugboat and the towed boat will appear. For example, when the boat is at the peak and trough of the wave, the cable will be tightened and relaxed, and the tension in the cable will increase sharply and decrease.Such as tug of the keel, wire and cable have larger Angle was often smaller than tow, tugboat may tilt tug capsized, even at this time for this demand function of towing automatically mitigate and its huge impact, the cable in the wind and waves in the towing operation, can release enough long cable in half wave cycle in order to ease tension, increase in the other half wave cycle after collect half wave period before the release of the cable, in order to prevent cable slack.In addition, the length of the cable released must be tested to ensure the relative distance between the tugboat and the towed boat, and at the same time, it can avoid the accident caused by too long cable or too much rope retraction.

boat yacht anchor horizontal windlass

The windlass is used to take in and put in anchors and chains.The windlass is usually installed on the main deck of the bow and stern of a ship, which is used for lifting anchors and anchoring mooring lines.The roller on both sides of the sprocket wheel can be used for winding the cable.According to different power, the windlass can be divided into manual windlass, electric windlass, electro-hydraulic windlass and steam windlass.At present, the main types of Marine windlass are electro-hydraulic windlass and electric windlass.

The operation of windlass is divided into five stages

Stage one - pull up the anchor chains that lie at the bottom.When the anchor motor is running at full speed, the load torque on the motor shaft is constant.The ship approached the anchor point slowly under the tension of the windlass chain.The cable overhang remains the same shape.

The second stage -- tighten the chain.At this time, the anchor machine tightens the anchor chain, the load torque on the motor shaft increases gradually, the rotation speed drops, and the shape of the anchor chain overhanging part changes until the anchor chain is straightened.The ship moved on.

The third stage -- anchor lifting and excavation.After the anchor chain was tightened, the anchor was pulled out by the inertia of the ship.If it cannot be pulled out, the motor will suffer from "jam", that is, stop running at a very large jam current.In order to prevent the motor from burning out due to blockage, the motor is required to have "soft" mechanical characteristics, and the torque of blockage is 2 times of the rated torque.In order to avoid too long turning time (1 min is required), the driver can drive slowly and pull up the anchor by the force of the propeller.

The fourth stage -- the anchor and chain are folded up in the water.After the anchor was unearthed, the load torque of the motor suddenly decreased and the motor speed increased.As the cable shortens, the load torque decreases gradually.

The fifth stage -- pull the anchor into the anchor hole, and the motor runs at a low speed.When the anchor enters the hole, the load torque of the motor increases due to the friction between the anchor and the steel plate of the anchor chain hole.

 

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