To what extent must the ship order crane wire rope be replaced? Are there any criteria?

The wire rope must be replaced with a new rope due to a 10% reduction in diameter due to wear and tear, and the most wear-resistant is the manganese phosphate coated wire rope. Please refer to the GB T29086-2012 wire rope safety use and maintenance national standard for maintenance, and in accordance with the GB T5972-2009 crane wire rope maintenance, maintenance, installation, inspection, scrapping inspection and scrapping for inspection and scrapping.

Commonly used wire rope varieties are phosphate-coated wire rope, galvanized wire rope, stainless steel wire rope or plastic-coated wire rope, used in the atmospheric environment, the patented technology produces the longest service life of manganese phosphate coated wire rope, phosphating coated wire rope fatigue life is 3-4 times that of smooth wire rope, heavy corrosion environment is preferred to have outstanding anti-corrosion ability of hot-dip galvanized - phosphated double-coated wire rope, smooth wire rope is being eliminated, for reference only.

There are several situations in which the steel wire needs to be replaced

a. When the amount of broken wire within 10 times the diameter length of the steel wire reaches 8%;

b. There is a broken steel wire in the steel wire;

c. The broken steel wire is concentrated in one place;

d. The diameter of the original steel wire with the amount of spiral necking deformation of the steel wire exceeding 1 3;

e. Basket-shaped twisting of steel wire;

f. Deformation of the steel wire bun;

g. The local diameter of the steel wire is 15% smaller than the original diameter;

h. The local diameter of the steel wire is 10% smaller than the original diameter, and there is corrosion or wear;

i. The wire rope is loose due to corrosion or wear;

j. Permanent deformation of local bending of steel wire;

k. Twisted or permanent twisted deformation of steel wire;

If the wire rope is rolled, if it is a new rope, it is because of the residual stress, and if it is an old rope, it is because of plastic deformation. Wire rope coiling requires a new rope, and the tension of this wire rope will be drastically reduced. When replacing the new rope, we should pay attention to the rope release method of the wire rope, the wooden shaft should be rotated and the rope should be released, and the wire rope should not be strong or loose.

Commonly used wire rope varieties are phosphate-coated wire rope, galvanized wire rope, stainless steel wire rope or plastic-coated wire rope, which is used in atmospheric environments, and the manganese phosphate coated wire rope produced by patented technology has the longest service life, and hot-dip galvanized-phosphated double-coated wire rope is preferred in heavy corrosive environments.

The phosphate coated wire rope produced by the patented technology gives priority to the use of manganese or zinc-manganese phosphating, compared with the smooth wire rope production process, only the final wear-resistant phosphating treatment process is added, and the wear resistance and corrosion resistance of the rope wire are greatly improved. At present, the fatigue test data shows that the fatigue life of the phosphate coated wire rope is about 3 times that of the smooth wire rope of the same structure (under comparable conditions in the laboratory), and there is a possibility of significant improvement with the study of the wear-resistant phosphate formula. Manganese phosphating is wear-resistant phosphating, which can solve the problem of wear and tear in the use of wire rope, and smooth wire rope is being eliminated, because phosphating coated wire rope is in short supply, which is currently more sought-after and for reference only.

There is nothing difficult about this, that is, pay attention to safety when you go to high school, and you can find a veteran to the hanging.

China's annual output of 1.8 million tons of steel rope ranks first in the world, phosphating coated wire rope is a revolutionary innovation technology in the field of wire rope in the world, the service life (fatigue life) has jumped significantly, and the smooth wire rope has been completely eliminated, and it has fully entered the era of phosphating coated wire rope

1.Phosphate coated wire rope (Chinese patent), after manganese or zinc-manganese phosphating treatment, the surface of the steel wire wear-resistant, rust-resistant ability jumps in an all-round way, GB T11376-1997 metal phosphate conversion film national standard for phosphate film wear-resistant, rust-proof effect has a detailed introduction, grease penetrates into the pores of the phosphate film to play an exceptionally excellent anti-friction effect, effectively inhibits the wear of the wire surface inside the wire rope, is an upgraded product of smooth wire rope, can replace the use of galvanized wire rope with a thin zinc layer after plating, At present, the fatigue life of phosphate rope is about 3 times that of smooth rope, and the best reaches 4 times, and the fatigue life can be compared through fatigue test, and with the in-depth study of wear-resistant phosphate solution in the future, the service life can also be greatly improved. The phosphate film is 3-60 grams2, and the wire rope is directly twisted without drawing after phosphating.

Note: Zinc-based phosphating for drawing should not be confused with manganese-based or zinc-manganese phosphating for rope-making wire. This technology is suitable for the production of a variety of wire ropes, such as elevator wire ropes, important wire ropes, mine wire ropes, anti-rotation wire ropes, wire ropes used in oil production, wire ropes for pile drivers, etc., with longer service life, lower cost and better stability.

2.Galvanized steel wire rope, including hot-dip galvanizing and electro-galvanizing, the straight-up hot-dip galvanized steel wire zinc layer is thicker, the thicker the zinc layer, the stronger the anti-corrosion ability, the longer the use time, and the electro-galvanized is thinner. Due to the certain anti-corrosion performance of the phosphate coating, the manganese phosphate coated wire rope can be used instead of some varieties of thin zinc galvanized wire rope, such as the atmospheric environment but the air is humid and the high temperature environment, while the corrosion resistance of the hot-dip galvanized-phosphating double-coated wire rope is further improved.

3.Stainless steel wire rope, the use of stainless steel wire twisted wire rope, such as 304 or 316 stainless steel, corrosion resistance is higher than hot-dip galvanized carbon wire rope, ** relatively expensive, the stainless steel wire for manganese phosphating coating treatment (stainless steel wire phosphating requires a special phosphating formula), can also greatly extend the service life.

4.Plastic-coated wire rope, on the basis of steel wire rope, the outer layer of steel rope or strand rope is coated with polyethylene and polypropylene.

5.Smooth wire rope, the British began production in 1834, the domestic 1939 Tianjin No. 1 wire rope factory began production (bankrupt in 2005), with the phosphate coated wire rope into the market in large quantities, will be phosphate coated wire rope completely eliminated.

6.Wire ropes for marine engineering mooring, relevant standards are in the process of being formulated and approved.

7.Cable wire rope.

Manganese phosphating coated wire rope is preferred in atmospheric environment, hot-dip galvanized - phosphating double-coated wire rope is preferred in corrosive environment, and offshore wire rope is preferred in seawater environment, which has a longer service life and lower use cost.

The working principle is similar to that of a crane crane.

Yes, no problem.

The length requirements of lifting ropes above 200m are not strict.

Whether it can be used or not should be determined by the customer. You should first ask the customer what exactly they want to do with it, where this "crane lifting and reuse" is used, and what is being hoisted. Through these, we can judge whether the short 1 meter has any impact on the customer.

Or you can also tell the other party that it is 1 meter less and let the other party judge whether it has any impact or not.

In business, honesty comes in handy a lot of the time.

OK. Absolutely, because your customer will increase the actual length when calculating the wire rope and will only tell you the length he wants. As long as the lifting rope is left on the winch at least 3 turns. Users generally stay a few meters more. You can rest assured.

It's hard to say, it depends on the needs of customers!