Wire rope in engineering crane used very common, generally by many high strength steel wire make up around and into. It was first made by single steel wire around together form shares, and then some stocks around into wire core, again by other shares of stocks of the rope around the wire rope around a core. Some imported wire rope internal also contains a plastic into core, usually in the form of plastic coating through special processing covering the wire core, important wire rope is in the proper internal filling rope lubricant to reduce friction.
Domestic wire rope according to wire core material generally points organic matter (hemp core and cotton core), asbestos core or metal core three, rope internal usually have no filler or lubricant.
According to the steel wire rope around into stocks and shares into the rope around each other and direction can be divided into the rope around the rope around and delivery, and according to the strands of rope twisted into left and right homonymous to twist and left, right interactive twisting; Import wire rope general with pay for standard rope around the rope, provisions of wire rope to spin and relative to the longitudinal axis of the wire rope for the shares of the benchmark helical screw to agree, divided into levorotatory and grape. Accordingly, also set shares to spin, namely to strands of the vertical axis as a benchmark, composition of the outside of the direction of the spiral wire per share to the spin. Ordinary wire rope in single use, all have to wire rope around the opposite direction to the phenomenon of rotation, in use for steel wire pulley block will rotate it caused by wire rope knob and, commonly known as the play ground. Relative to the ordinary wire rope, at present not rotating wire rope already begins a large number of application. The so-called not rotating wire rope is based on such a principle, namely the rope and shares in opposite directions and the torsion of torque equal: import not rotating wire rope is different, its principle is to make the wire core spin to the rope itself with spin to instead, when stress, wire core produce torque and produce torque of the same size, in opposite directions.
The wire rope shares but also by rolling or die extrusion etc post-processing ways to become close strands, deal with the diameter of the HouGu will decrease, and surface finish high. Therefore, the close of wire rope can use of a thick wire, the same diameter, the close strands of wire rope filling coefficient is higher, breakage tension greatly improved. When in the drum on multilayer twists, common stock of wire rope outside its shares in between layer and layer extrusion more serious, wire rope fast surface wear. And close strands of wire rope is a higher resistance to wear ability and ability of extrusion.
The wire rope to choose the correct or not directly affect the service life of the string and string produce structural deformation, the fracture and unexpected failure, etc. It is therefore recommended selection principle of the following:
1) when a no guidance weight in the larger or ascension highly many times under no guidance weight ascend, choose not rotating wire rope:
2) when a guide weight ascension or in smaller height is many times under guidance weight ascension (such as driving) or left-lateral and dextral rope when used in pairs, can choose ordinary wire rope.
Spin the determination of wire rope to should be followed:
Dextral sheave reel of recommended levorotatory wire rope: instead, levorotatory rope slot should use the drum of d-bormeol wire rope.
For single winding not rotating wire rope, must strictly abide by the principle, the structure of wire rope or easy cause permanent deformation; For multistory winding, rope swing to the direction of the groove by the wirerope drumgroove decision, so as to lay the foundation of the next layer.
The wire rope around the multilayer rolling friction between each other and by all the impact extrusion larger, easy to produce a rope phenomenon, so should choose sheave diameter is slightly less than pitch and sheave diameter of wire rope, and to increase the wire rope and rolling the contact area between, reduce the friction between the adjacent wire rope, so as to improve the life of wire rope. Practice has proved, the diameter of wire rope than sheave pitch small 1%, is helpful to the row of rope close, effectively remove PaSheng, a rope phenomenon.
In the same diameter, the number of wire rope is the more the diameter of fine, single steel wire is fine, the wire rope flexible good, overcome many times when rolling in and out of wire rope by reverse bend force, wear rope also easy. And the thicker the shares, the steel wire is thicker, can better abrasion resistance and mechanical damage, corrosion and extrusion pressure. Therefore, only the two advantages good together, is really high performance of high quality steel rope.
In addition, the wire rope in selecting process but also pay attention to their smallest diameter and minimum breakage should be consistent with the tension of the provisions of the ISO4308 standard.
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