Manganese phosphating coated elevator wire rope is an upgraded product of smooth elevator wire rope.

At present, the traction wire rope of smooth elevator is widely used, which is twisted by smooth steel wire, that is, after final heat treatment and cold drawing with a total compression ratio of 75%-93%, the steel wire is pretreated before drawing, and the cold-drawn steel wire is directly twisted into strands or steel cores without any surface treatment. During the use of smooth elevator traction wire rope, some elevator wire ropes broke at the initial stage of use. Although the reasons for this result include many factors, the internal quality of wire rope is undoubtedly one of the main influencing factors. This problem is extensive and long-term, and has existed in the products of major elevator rope manufacturers for many years. Although wire rope manufacturers attach great importance to it, this problem has not been completely solved so far.

Patent technology of phosphating coated steel wire rope, wear-resistant phosphating treatment is carried out on the steel wire rope whose mechanical properties meet the requirements, and a phosphating film with a film weight of 3-60g/m2 is formed on the surface of the steel wire rope. Strands, steel cores and steel wires are directly twisted by phosphating rope-making steel wire rope, and the rope-making steel wire rope after phosphating and before twisting is not cold-drawn, which is the best process for manufacturing phosphating coated steel wire rope.

There are many kinds of phosphating processes according to their chemical composition, such as iron series and zinc series. However, in order to ensure the protective effect on the surface of rope-making steel wire, it is suggested to use manganese or zinc-manganese phosphating formula. These two phosphating films have high hardness and good wear resistance, and are firmly combined with steel wire matrix. The weight of phosphating films should be controlled between 15-30g/m2. Only by using thick film phosphating can the oxidation resistance and corrosion resistance of rope steel wire be effectively improved. According to the above process, the manganese-based wear-resistant phosphating coating traction elevator wire rope is produced.

The mechanical properties of steel wire are almost unchanged before and after phosphating. Even if 15-30g/m2 thick film phosphating is adopted, the diameter of steel wire is only slightly increased. GB8903-2005 "Steel Wire Rope for Elevator" is a compulsory national standard, and the phosphating coated elevator steel wire rope can completely meet all technical requirements of this standard, including all technical indexes such as mechanical properties and diameter accuracy of steel wire rope.

The determination of phosphating film weight of phosphating coated elevator wire rope can be carried out according to the following methods: firstly, according to Article 2. 1.4 of Yb/T412008 Method for Determining Oil Content of Steel Wire Rope, the grease on the surface of steel wire is thoroughly cleaned and fully air-dried, and then according to GB/T9792-2003 Gravimetric method for determining the quality of conversion film per unit area on metal materials.

The national standard GB/T11376-1997 is introduced, and the function of phosphating film is discussed in detail. The main functions of phosphating film include improving the surface friction performance of metal materials to promote their sliding, that is, improving the wear resistance and friction reduction ability, enhancing the corrosion resistance of metals or being used as bonding mesophase. Manganese-based and zinc-manganese-based wear-resistant phosphating processes have been widely used in the manufacture of friction bearing parts in automobile, chemical industry, light industry, electrical appliances, national defense and other fields, such as engine piston rings, gearbox steel gears, cams, tappets, crankshafts, bearing seats and so on. Their main functions are to reduce the friction coefficient, improve lubrication and improve the surface wear resistance of friction parts. , and achieved good application results in practical use. Phosphating coated steel wire rope also uses the wear-resisting, friction-reducing and corrosion-resisting functions of phosphating film to protect the surface of rope-making steel wire. Phosphating technology has been very mature and low cost. The wire rope industry generally has decades of experience in producing zinc-based phosphating steel wire for wire drawing. The production process of wear-resistant manganese-based and zinc-manganese phosphating steel wire for rope making is similar to that of zinc-based phosphating steel wire for wire drawing, only the degreasing process of steel wire surface is needed, so the wear-resistant phosphating steel wire for rope making can be produced on an industrial scale without any technical obstacles.

Compared with the smooth elevator wire rope with the same structure, the improvement of fatigue life (service life) of manganese-based wear-resistant phosphating coating elevator wire rope can be verified by fatigue test. In order to ensure the comparability of test data, the fatigue test should be carried out in the same wheel groove of the same fatigue testing machine under the same test conditions, and then the fatigue life can be compared. The actual service life of elevator wire rope is proportional to the fatigue life. The stability and reliability of elevator wire rope will be greatly improved while the fatigue life of elevator wire rope is greatly improved. Through the elevator tower test, the traction ability of the phosphating coating traction elevator rope under various working conditions can be tested to ensure the safe operation of the elevator. The patent technology of phosphating coated steel wire rope has completely solved the problem of broken wires and strands of some steel wires in the early stage of smoothing elevator rope.

At present, urban construction is dominated by high-rise buildings, and many elevators need a large number of elevator ropes to match them. The running speed of elevators is developing to high speed and ultra-high speed, and a considerable number of elevators adopt multi-rope suspension mode. These elevators with heavy load, fast running speed and high frequency of use, especially those whose elevator wire rope is subjected to two-way bending deformation during operation, put forward higher and higher requirements for the fatigue resistance of elevator traction wire rope, and meeting these requirements depends on a wide range of new technologies.

The patented technology of phosphating coated wire rope has been successfully applied to hoisting wire rope and achieved good test results. If the manganese-based wear-resistant phosphating coated elevator wire rope produced by this technology can meet the traction requirements under all working conditions and ensure the safe and stable operation of the elevator, then promoting the use of phosphating coated elevator wire rope as soon as possible can greatly improve the competitiveness of elevator wire rope and elevator manufacturing enterprises in the market, because it has a longer service life than smooth elevator wire rope with the same structure and is more cost-effective than traction steel belt. The implementation of innovative technology can enhance the ability of enterprises to obtain rich profits in the fierce market competition.

Manganese series wear-resistant phosphating coated elevator wire rope is an upgraded product of smooth elevator wire rope, which represents the development direction of high performance wire rope manufacturing technology.