What are the structural characteristics of ship mounted anchor chains?

The role brought by the structural characteristics of ship anchor chains with gears

The main function is to fix and stabilize the ship.

The most basic condition for a ship's anchor chain to function is to hook onto something at the bottom of the sea. If the ship's anchor chain is not long enough, the anchor will not work. If the seabed is flat, or if the anchor is not fixed, or if the hook is not too firm, it can be fine if the waves are calm. However, if the waves are too large and the anchor cannot hold onto something, it will cause the anchor to lose its function, which is called "anchoring". During the anchoring period, it is very dangerous for the ship to anchor because the main engine is usually stopped when the ship is anchored. If the ship sails immediately, it will take time, and it is very dangerous for the unpowered ship to drift around. So, that's why the concept of anchorage came into being. Anchorage implies that the seabed is relatively rough, and it also needs to be able to shelter from wind.

The reasons for the structural characteristics of ship mounted anchor chains

The length of the ship's anchor chain is often greater than the water depth, so the anchor chain on the bottom of the water is in a flat state. When the ship is disturbed (such as waves), the anchor chain on the bottom of the water will be pulled, and the anchor on the bottom of the water will be subjected to a horizontal force at the connection point of the anchor chain. At the same time, the gravity of the anchor itself acts on the contact point between the anchor claw and the bottom of the water (point C in the figure), and the two forces combine to make the anchor move diagonally downward, which is the process of anchoring into the soil. After the anchor is pulled into the bottom of the water, it can provide the ability for the ship to anchor. It should be noted that this ability is not only achieved by one anchor, but also by a long ship with anchor chains that play an important role.

The relationship between the structural characteristics of ship grade anchor chains and the ship grade anchor chain tube

The ship mounted anchor chain tube is a hole for the entry and exit of ship mounted anchor chains and the storage of anchor shafts, with a diameter of about 10 times the chain diameter. The marine anchor chain tube consists of three parts: deck chain holes, side chain holes, and tube body. The upper and lower openings of the marine anchor chain tube are generally equipped with anchor lips, which are divided into upper anchor lips and lower anchor lips (the arc radius of the outer edge of the anchor lip made of steel plate or cast steel should generally not be less than 12 times the diameter of the marine anchor chain). Its function is to reduce the wear and tear of the marine anchor chain and the upper and lower openings. There is a flushing device inside the simplified Chinese characters, which is used to flush the anchor and the ship's gear anchor chain during anchoring. A wave proof cover is installed at the deck chain hole to prevent river water from surging onto the deck from the ship's blocked anchor chain tube, and to ensure the safety of personnel. Some ships are equipped with guide chain rollers at the deck chain holes to reduce friction between the ship's anchor chains and the deck chain holes. Some low freeboard and fast boats make staggered holes at the side chain holes to store anchor crowns and claws in order to reduce water and air resistance caused by anchors and minimize splashing caused by anchor strikes.

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