The purpose and use of marine rope
Every time you use the safety cable, you must check the appearance and performance. During the use, you must also pay attention to the inspection. You must experiment once in half a year to prevent the requirement of no damage.
Ropes and cables are mainly used in the fields of ship equipment, fishery fishing, port loading and unloading, power construction, petroleum exploration, national defense industry, and sporting goods. Its structure is divided into three-strand, eight-strand, and twelve-strand ropes. The product is widely used, with high strength, low elongation, wear resistance, soft and smooth, and convenient operation.
Precautions for the use of ropes: Before each use of the ropes, carefully check the markings, insert the eyelets, and the rope body for any cuts, broken strands, broken wires, kinks and other damaged parts. If there are no abnormalities or defects, It can be used normally; when unrolling the rope, the rope should be released from the end of the rope in the circle, and the rope should be released counterclockwise. If the rope is unrolled counterclockwise, a rope kinking will occur. If a kink occurs, return the rope to the loop, flip the loop, and then pull the rope from the center. A better method is to unroll the rope on a turntable, and you can pull the rope from the outer rope end. If a person stands under a tightly tightened rope, danger will occur. Once the rope is out of control, a huge tensile rebound will occur, which may cause casualties.
If the rope is unrolled from the rope shaft, the rope shaft itself should rotate freely. It is easy to do this by using a pipe through the center of the rope shaft. However, it is prohibited to lay the rope shaft to unroll the rope. If the rope is unrolled from the pulley device, the pulley The ratio of the diameter D to the diameter d of the rope should exceed 5, but for some high-performance fiber ropes the ratio can reach 20. For rope, it is recommended that the diameter of the groove of the pulley is 10% -15% larger than the diameter of the rope. If the arc of the rope in contact with the groove is 150 degrees, the rope can achieve the best force. The flange height of the pulley should be at least 1.5 times the rope diameter. To prevent the rope from running out of the pulley. In addition, the pulley should be checked frequently, and the bearings should be regularly maintained to ensure that the pulley rotates smoothly. The rope should be scrapped or discontinued in the following cases: the rope is obviously scorched or melted; the straight line distance is equal to the length of the rope, and the surface rope or strand volume is reduced by 10%; the rope is exposed to an extreme range of extreme temperature environments ; UV exposure is degraded, and the surface of the rope yarn is fragmented; the rope appears in the severely damaged hot melt, hardened, flattened area; the number of rope yarns affected by melting or fusion exceeds 20%.
Ship ropes have many advantages. Ship ropes are lighter in weight, higher in strength, and more resistant to impact and abrasion.
For example, the strength and abrasion resistance of some nylons are many times that of cotton and linen. The specific gravity of polypropylene is less than the specific gravity of water. It can float on the water and is convenient and safe to use. The chemical fiber cable is divided into three strands, four strands, six strands, eight strands, and twelve strands according to the processed structure. The general diameter is about 4mm-50mm, and the eight strands are about 35mm-120mm in diameter.
Marine ropes are mainly divided into polypropylene, polyethylene, polypropylene filament, nylon, nylon multifilament, polyester, high-molecular polyethylene, and beef tendon (composite) ropes. The specifications can be 6mm-150mm. There are various types. No matter which one is, it needs to be clear how to use it on board.
In addition to light weight, high strength, good impact resistance and abrasion resistance, marine ropes have the advantages of corrosion resistance, mildew resistance, and insect resistance. For example, the strength and abrasion fastness of nylon ropes are several times higher than hemp and cotton ropes, and the specific gravity of polypropylene ropes is less than water, which can float on the water surface and is easy and safe to operate.
Collected and edited by Marinusedgood Co., Ltd