The purpose of the Marine cable and purchasing

by:SanTong     2021-02-04
Cable is mainly used for ship equipment, fishing, port loading and unloading, electric power, oil exploration, national defense construction, sporting goods and other fields. Its structure is divided into three, stereotype, twelve strands of rope, products widely used and has high strength and low elongation, wear resistance, soft and smooth, easy operation, etc.     Cable to note: the use of cable before each use, should carefully check tag markup tags make eye, rope body cut mouth, broken stocks, broken wires, kinking and other damaged parts, if there is no exception and defects can be normal use; A rope, should begin from the circles began to release the rope the rope, the rope should play out counterclockwise. Would happen if counterclockwise rope, the rope knot. If produce kink, should be put back to the rope loops, reverse loops, and then pull the rope from the city centre, a better approach is to a rope on a turntable, can pull the rope from the external rope at this time. If people stand below the was too taut rope, will produce risk, once the rope out of control, will produce a great rally rebound, is likely to cause casualties.     If the rope from the rope on the shaft, rope shaft itself should be free to rotate, using a tube through the line shaft center would be easy to do this, but on vertical line shaft on the ropes; If the rope on the pulley, the pulley diameter D and the diameter of the rope D should be more than 5, but for some high performance fiber rope ratio can reach 20. Suggestions for rope pulley groove diameter of 10% larger than the diameter of a rope The radian of 15%, if the rope at the contact wheel trough is 150 degrees, rope can achieve the best stress state, the pulley flange height should be at least 1. Five times the rope diameter, to prevent the rope ran out of the pulley. In addition, often should inspect the pulley, and regular maintenance of bearing to ensure the pulley smooth rotation.     Cable develop any of the following should be scrapped or stop using: cable appear burned or melted; Linear distance is equal to the cable length on the surface of rope yarn or strand volume decreased by 10%; Cable leakage, exposed to the overspray extreme temperature environment; Uv exposure downgrade, rope yarn surface into pieces; Cable in severely damaged the hot melt, harden, squish area; Melting or fusion effect of rope yarn quantity is over 20%. How Marine cable procurement: & have spent   (1) the choice of materials. The same thickness of the cable under tensile and wear resistance is small, the cause of this situation is the different material, such as simply improve the tension of the cable can choose polypropylene filament material of the cable, if you worry about rope drag and drop on the deck when the excessive wear, need to add a layer on the outside of the cable of the polyester layer increased wear resistance, 'polyester multifilament' structure is adopted, Internal is sustain tension polypropylene filament, external is to increase wear resistance of polyester package) In this process and can increase the service life of the cable material, usually can increase 1 year.     (2) the brand and the selection of classification survey certificate. Cable is an important safety equipment on board, the international maritime organisation for the supply of Marine cable requirements: must have a certificate of classification society, that is, on the shore personnel ( Usually refers to the crew) At the time of purchase the cable, must pay attention to the classification society certificate issued by cable manufacturers.     Outside, buying cable brand is also very important, choose a cable manufacturer with a long history is very important to use safety and service life of the rope, small factory production of cable quality closes nevertheless, cut corners on raw material, craft in behind, such cable using hidden trouble on the ship is too big. Unexpected rupture, besides may cause the ship and terminal berth collision, also is likely to cause casualties. So, it is important to the quality of the cable.
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