What are the basic principles and working conditions of lifting electromagnet?

The principle is that the electromagnetic effect of the coil produces attractive force. Just don't overload. Please read the crane manual carefully.

The main varieties of wire ropes in China are as follows:

1. Phosphated steel wire rope (patented in China), the steel wire is phosphatized by manganese series and zinc-manganese series, which greatly improves the wear resistance and corrosion resistance of steel wire, and makes the fatigue life of phosphatized steel wire rope 3-4 times longer than that of smooth steel wire rope with the same structure (under comparable conditions in the laboratory), exceeding that of imported steel wire rope, and phosphatized steel wire rope is completely replacing all kinds of smooth steel wire rope. It can also be used instead of galvanized steel wire rope with thin zinc layer after plating (corrosion resistance can be tested by salt spray test). Because of its long service life, phosphating coated steel wire rope has a unit cost of only 30-45% of that of smooth steel wire rope, and its quality stability and reliability are better.

2. Galvanized steel wire rope, including hot dip galvanizing and electro-galvanizing. The thicker the zinc coating, the stronger the corrosion resistance. The thickness of zinc coating is expressed in grams per square meter.

3. Stainless steel wire rope, mainly made of 304 or 3 16 stainless steel, has excellent anticorrosion effect, but it is expensive.

4. Based on plastic-coated steel wire rope and carbon steel wire rope, the outer layer is coated with polyethylene, polypropylene or nylon.

5. Smooth steel wire rope has a short service life and the market demand drops sharply, so it is being completely eliminated by phosphating coated steel wire rope.

For hoisting machinery used in atmospheric environment, manganese phosphating coated wire rope is preferred, hot dip galvanized-phosphating double-coated wire rope is preferred in heavy corrosive environment, and marine wire rope is preferred in seawater. Please note that the name of wire rope must be indicated on the purchase invoice, such as phosphating coated wire rope or 3 16 stainless steel wire rope, to prevent illegal enterprises from infringing their legitimate rights and interests with counterfeit products. In addition, patented products will generally be marked with the patent number on the outer package of steel wire rope, and the warranty should have the main technical indicators, such as the type and weight of phosphating film (phosphating film has an important impact on the service life of steel wire rope, such as wear resistance and corrosion resistance, etc.), for reference only.