Shackles are detachable annular metal members used to connect various rope eye loops, chain links and other rigging. The shackle consists of two parts: the body and the cross bolt. Some horizontal bolts have threads, some have pins, and there are two common types of straight shackles and round shackles. Shackles are often named according to the parts used, such as the anchor shackle used on the anchor rod; the anchor chain shackle used on the anchor chain; the rope head shackle used on the rope head. [3]
A hook is a tool used to hang goods or equipment and is made of steel. The hook is divided into three parts: the hook handle, the hook back and the hook tip.
According to the direction of the upper eye ring of the hook handle, it is divided into front hook and side hook. The hook tip of the front hook is perpendicular to the plane of the upper eye ring of the hook handle, and the hook tip of the side hook is on the same plane as the upper eye ring of the hook handle. . Ordinary cargo hooks mostly use broken side hooks.
Precautions for the use of hooks: When using the hook, keep the force on the center of the hook back to avoid breaking the hook; the strength of the hook is smaller than that of the shackle of the same diameter, and it should be used instead when hanging heavy objects. Shackle to avoid straightening and breaking the hook. [3]
The chain rope is a chain composed of no gear links. It is often used on ships as rudder chains, short chains for lifting cargo, heavy chains, and adjusting links for safety cables. It is also used for pulling and binding. The size of the chain cable is expressed in terms of the diameter of the chain link in millimeters (mm). Its weight can be calculated from the weight per meter of length.
When using the chain cable, the chain ring should be adjusted first to avoid lateral force, and sudden force should be avoided to prevent the chain cable from breaking. Chains should be checked and maintained frequently to maintain good technical condition. The contact part between the chain ring and the chain ring, the chain ring and the shackle is easy to wear and rust. Pay attention to the degree of wear and rust. If it exceeds 1/10 of the original diameter, it cannot be used. You should also pay attention to check whether the chain is damaged or not for cracks. When checking, you should not only check from the appearance, but use a hammer to hit the chain links one by one to see if the sound is crisp and loud.
To eliminate the rust of the chain rope, the fire impact method should be adopted. The expansion of the chain ring after heating can make the rust brittle, and then hit the chain ring with each other to completely eliminate the rust, and at the same time, it can also eliminate the small crack on the chain ring. The chain rope after rust removal should be oiled and maintained to prevent rust and reduce rust damage.
