Summary：

At present, the failure of mining machinery is mainly due to friction wear, and the friction wear of mining machinery to people's lives and property caused huge losses, and then because of the poor working environment of mining machinery, the working conditions are also more complex and harsh, work at high speed and high-temperature conditions, there is a lot of heat due to friction and dissipation, it caused a lot of energy waste, and ultimately lead to mining machinery Friction wear loss efficiency, resulting in hundreds of millions of dollars of losses. Now there are four main forms of failure of mining machinery and equipment, including abrasive wear, fatigue wear, adhesive wear, corrosion, or erosion wear, these wear because of long-term continuous friction, will be on the surface of the mining machinery parts of the mechanical model, and ultimately make the mining machinery parts of the scrap, stop the normal operation of the work, affecting the mining machinery and people's activities.

Case details：

1. Abrasive wear

Abrasive wear is due to the roughness and hardness of the surface of the parts are different, in the process of mutual friction will make some free particles in the process of sliding between them, thus causing wear between the parts. Mining machinery parts surface hardness difference so that the parts of the softer material will be scratched out of the groove, it will cause mining machinery and equipment to reduce efficiency. Abrasive wear on the degree of wear of mining machinery to a large extent, depending on the hardness, shape, size, and distribution of abrasive particles and other factors, and the relative value of mutual friction parts material hardness, the higher the value of the hardness of the abrasive particles will be the friction of the more serious parts, the greater the impact on the entire mine work will be.

2. Fatigue wear

Mining machinery in the process of continuous use, all the time in the mining machinery and equipment wear, mechanical parts in the long-term repeated tangential stress, to reach the fatigue limit of the material, it will make the mining machinery parts because of fatigue and wear. Fatigue wear degree on mining machinery and equipment tangential stress wear all the time, but because these abrasive grains in the process of carrying out parts cutting, the stress is relatively small, only in the long-term repeated action of the conditions, can cause more obvious wear on mining machinery, due to the difference in the strength of the material of the parts, so that carrying out parts material is weaker material will break, and leave some pockmarks, it will appear Cracks.

3. Adhesive wear

Adhesive wear is in the use of mining machinery and equipment, mechanical parts in the case of load, some contact points of stress is relatively large, plastic deformation will occur, so that the two mutually contacting surface adhesion, to connect, causing wear and tear on mining machinery. In the process of mechanical operation, part of the pressure is relatively large, friction when the temperature is also relatively high, it will make contact with the surface because there is no lubrication, it will be direct contact or even become dry, the lack of lubrication makes the friction between the mechanical parts increased, resulting in the metal surface softening, resulting in adhesive wear.

4. Corrosion and erosion wear

Corrosion wear is the result of corrosion and wears together, in the process of lubricant use, some of the chemical substances in it and the metal chemical reaction, produce some acid, and then corrode the metal material. Mining machinery parts because of corrosion and the formation of part of the metal corrosion, these substances adhered to the mechanical parts, in the process of friction and wear these substances are not firmly adhered, will be stripped down together with the metal material, the metal surface of the oxide film is stripped off, so that the metal surface is constantly exposed to the air, which will cause the new surface is corroded and worn, resulting in increased wear of the metal surface. Mining machinery parts in the working conditions of vapor pressure, constantly metal for liquid flow impact, so repeatedly hit the pressure makes in the metal surface erosion wear.

Mining machinery wear parts:

Cut-off teeth, cutter teeth, shovel teeth, wear-resistant liner, central groove, road roller, road teeth, etc., the use of Shanghai DuoMu plasma overlay welding machine can effectively repair mining machinery, wear-resistant corrosion resistance, extend the service life of machinery.