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Safety factor of steel wire rope

The steel wire rope has to bear the dynamic load during the use, and the appropriate safety factor must be selected for use. The so-called safety factor is the ratio of the minimum breaking force of the wire rope to the load capacity. The cargo safety factor is generally 6. The safety factor for manned is generally 12. For example, the minimum breaking force of the wire rope is 12 tons, the maximum cargo capacity is 2 tons, and the maximum passenger weight is 1 ton, which is for reference only.
 
The user needs the steel wire rope with the longest service life or use time and the most cost-effective, please choose according to the use conditions and requirements:
 
1. Phosphate-coated steel wire rope (Chinese patent), after manganese or zinc-manganese phosphating treatment, the wear resistance and rust resistance of the steel wire have been improved. GB/T11376-1997 metal phosphate conversion coating national standard for phosphating Membrane wear resistance and rust prevention are introduced in detail. Grease penetrates into the pores of the phosphating film to have an exceptionally excellent anti-friction effect and effectively inhibit the occurrence of fretting wear. It is an upgraded product of smooth steel wire rope. It is used in atmospheric environments. The fatigue life of the phosphating rope is about 2-3 times that of the smooth rope. The fatigue life can be compared through the fatigue test. With the in-depth research on the wear-resistant phosphating solution, the service life may be greatly improved. Phosphating film is 3-60g/m2, the steel wire is twisted directly without drawing after phosphating.
Note: The zinc-based phosphating for drawing cannot be confused with the manganese-based phosphating of the rope-making steel wire. This technology is suitable for the production of a variety of wire ropes, such as elevator wire ropes, wire ropes for important purposes, mine wire ropes, anti-rotation wire ropes, steel wire ropes for oil production, steel wire ropes for piling machines, etc. (Baidu Library has free download of phosphate coating wire rope papers).
2. Galvanized steel wire rope, including hot-dip galvanized and electro-galvanized. The zinc layer of direct hot-dip galvanized steel wire is thicker. The thicker the zinc layer, the stronger the anti-corrosion ability and the longer the use time, while the thinner the electro-galvanized steel wire. Because the phosphating coating has certain anti-corrosion performance, the manganese phosphate coating steel wire rope can be used instead of some varieties of thin zinc-coated galvanized steel wire rope, such as atmospheric environment but high temperature environment with humid air.
3. Stainless steel wire rope, steel wire rope twisted with stainless steel wire, such as 304 or 316 stainless steel, has higher corrosion resistance than hot-dip galvanized carbon steel wire rope, and is relatively expensive. The stainless steel wire is treated with manganese phosphate coating (stainless steel wire Phosphating requires special phosphating formula), which can also greatly extend the service life.
4. Plastic coated steel wire rope, on the basis of the steel wire rope, the outer layer of the steel rope or strand rope is coated with polyethylene and polypropylene.
5. Glossy steel wire ropes were produced in the UK in 1834. The domestic Tianjin No. 1 Steel Wire Rope Factory began production in 1939 (bankrupted in 2005). As the phosphate coated steel wire rope entered the market in large quantities, it will be completely eliminated by the phosphate coated steel wire rope.
 
The atmospheric environment is preferably a manganese-based phosphating-coated steel wire rope, and the corrosive environment is preferably a hot-dip galvanized-phosphating double-coated steel wire rope.
 
Please refer to GB/T29086-2012 national standards for safe use and maintenance of steel wire ropes for maintenance, and perform inspections and scraps in accordance with GB/T5972-2009 crane wire rope maintenance, installation, inspection, and scrapping.

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