Mining high-strength circular chain, is a transmission chain mainly used for some mining equipment such as scraper conveyors, transfer machines, coal mining machines, etc. The normal operation of the equipment requires the participation of the circular link chain. As a high-strength link connector, the connecting ring plays an important role in the mining and transportation process of the scraper conveyor, directly affecting the operating efficiency of the conveyor.
The mining circular link chain is composed of open connecting rings or flat connecting rings, mainly used for the traction chain of large coal mining machinery, and is the foundation for ensuring the normal operation of mining equipment. Therefore, the detection of mining circular link chains is very important.
Circular chain can be divided into four types according to different purposes and functions: transmission chain, conveyor chain, traction chain, and specialized special chain. The circular ring chain has different specifications according to its purpose, such as high-strength circular ring chains for mining, lifting circular ring chains, conveyor chains, and other models. There are generally 10 * 40, 14 * 50, 18 * 64, 22 * 86, 26 * 92, 30 * 108 and other models that are widely used in the market.
The technical standards for different specifications and purposes also vary. Many domestic and foreign enterprises that produce mining circular chain adopt different circular chain standards. Most European and American countries use the American chain standard ANSI to produce chains, while some European industrial chain production countries use the corresponding BS standard. Regardless of the production standard used by the circular chain manufacturer, its processing technology and material are two factors that determine the quality of mining circular chain. The earliest circular chain materials used by Chinese circular chain manufacturers were imported from the United States and Europe, and now they can basically achieve the localization of circular chain materials used by circular chain manufacturers.
In addition to different standards, the grade and material used for domestic circular chain are also different. According to the level, it is divided into 30 levels, 40 levels, 50 levels, and up to 120 levels. The materials used mainly include Q235, 20MNSI, 20MN2, 25MNV, 23MnNiMoCr54, and other materials. The circular chain materials produced in China have evolved from carbon manganese steel to manganese nickel chromium molybdenum series. With the development of technology, the content of silicon and manganese has decreased, while the content of chromium and molybdenum has increased, resulting in a significant improvement in the toughness of the products; In recent years, with the increasing requirements for the use of mining circular link chains and the increasing specifications and models of circular link chains, Chinese circular link steel chain manufacturers have begun to develop new materials with special properties.
The production process of mining chain: cutting → cold bending and weaving → jointing → welding → primary calibration → heat treatment → secondary calibration (pre tensioning) → inspection. Welding and heat treatment are key processes in the production of mining circular link chains, which directly affect product quality. Welding parameters can improve the yield and reduce production costs; A suitable heat treatment process can fully utilize material properties and improve product quality. Currently, the heat treatment of mining circular link chains generally adopts the medium frequency induction heating continuous quenching and tempering method. The essence of intermediate frequency induction heating is that the molecular structure of an object is stirred under an electromagnetic field, and the molecules gain energy and collide to generate heat. During intermediate frequency induction heat treatment, a certain frequency of intermediate frequency alternating current is applied to the inductor, and the workpiece moves uniformly in the inductor. This generates a 16 * 55 chain induction current with the same frequency as the inductor in the opposite direction, which converts electrical energy into heat energy and heats the workpiece to the required temperature for quenching and tempering in a short period of time. Compliance conditions and failure analysis of mining circular chain.
