In the use of lifting steel wire ropes, safety issues must be paid attention to, and different types of lifting steel wire ropes must be selected according to different machines and working environments, so the selection of steel wire ropes must also be paid attention to.
In the selection process of steel wire rope, it is also necessary to pay attention to its minimum diameter and minimum breaking tension should comply with the ISO4308 standard. Correspondingly, the direction of rotation of the strand is also defined, that is, based on the longitudinal axis of the strand, the direction of the spiral of the outer filaments forming the strand is the direction of rotation per share. The strands of the steel wire rope can also be made into compact strands by post-treatment methods such as rolling or die extrusion. The diameter of the strands after disposal will be reduced, and the appearance of the strands will be very high. Coconut Coconut, therefore, only when the two strengths are well combined, can it be a truly high-performance high-quality wire rope.
Under the same diameter, the larger the number of steel wire rope strands, the smaller the diameter, and the thinner the single wire. This kind of wire rope has good flexibility and can well overcome the reverse bending force when the wire rope enters and exits the drum multiple times. The rope is easy too. The multi-layered steel wire ropes have large frictional forces and crushing forces, and are prone to random ropes. Therefore, a steel wire rope with a diameter slightly smaller than the rope groove pitch and the rope groove diameter should be used to increase the space between the wire rope and the drum The contact area of the steel wire reduces the friction between adjacent wire ropes, thereby improving the life of the wire rope.
Therefore, the recommended selection principles are as follows, in addition. Non-rotating wire ropes are used when performing a non-guided weight promotion or multiple non-guided weight promotions at larger heights; when performing a guided weight promotion or multiple guided weights at smaller height When the object is promoted (such as driving) or left-handed and right-handed ropes are used in pairs, ordinary steel ropes can be used.
For single-layer entangled non-rotating wire ropes, the above principles must be strictly adhered to, otherwise permanent deformation of the wire rope structure is likely to be caused; for multi-layer entanglement, the rotation direction of the rope is determined by the direction of the drum rope groove for the next Lay the foundation. The thicker outer strands also have thicker steel wires, which can better resist wear, mechanical damage, erosion and crushing forces.
The tight-stranded steel wire rope has higher wear resistance and crush resistance. Some inlet wire ropes also include a plastic ferrule, which is usually covered by a special treatment cage in the form of a plastic coating. The important wire rope is filled with appropriate lubricants to reduce friction. Therefore, the steel wire rope using the tight strand can use a thicker wire. Under the same diameter, the steel wire rope using the tight strand has a higher filling factor and a great improvement in breaking tension.
The so-called non-rotating wire rope is based on the principle that the torsional moments of the rope and the strand are opposite and equal in size: the inlet non-rotating wire rope is different. The principle is to make the rotation of the core of the rope opposite to the rotation of the rope itself. When the force is applied, the torque generated by the rope core is equal to the torque generated by the outer strand, and the direction is opposite. First, a single steel wire is wound together to form a strand, and then some of the strands are wound into a rope core, and then an outer strand composed of other strands is wound around the rope core into a steel wire rope. The determination of the rotation direction of the wire rope should follow: it is recommended to use a left-handed wire rope for the drum with a right-handed rope groove; otherwise, a right-handed wire rope should be used with the left-handed rope drum.
Compared with ordinary steel wire ropes, non-rotating steel wire ropes have started to be widely used. The steel wire rope can be divided into forward rope and cross rope according to the mutual direction of the steel wire into the strand and the strand into the rope, and according to the twist direction of the strand, it is divided into left and right co-twist and left and right intertwist; Generally, the winding rope is used as a standard rope, and the rotation direction of the wire rope is determined to be the same as the rotation direction of the outer strand helix relative to the longitudinal axis of the wire rope, and is divided into left-handed and right-handed. Practice has proved that the diameter of the steel wire rope is 1% smaller than the pitch of the rope groove, which helps to arrange the rope tightly and effectively eliminates the phenomenon of climbing and random ropes.
The selection of the steel wire rope is accurate, which directly affects the service life of the rope and causes structural deformation, fracture and accidental failure of the rope. When a single wire rope is used in a single wire, the wire rope rotates in the opposite direction. When used in a pulley block, the wire rope is twisted due to the rotation of the wire rope. When multiple layers of entanglement are performed on the reel, the outer strands of the ordinary steel wire rope are severely squeezed between the layers, and the outer surface of the steel wire rope wears quickly. Steel ropes are very common in engineering cranes, and are generally made of many high-strength steel wires.
There is usually no filler or lubricant inside the rope. Domestic steel wire ropes are generally divided into organic matter (hemp core and cotton core) asbestos core or metal core according to the rope core information.
The danger of lifting steel wire ropes is very high, so everyone must do maintenance and inspections on a daily basis, otherwise injuries may easily occur.