Scrap iron steel production is an important resource burden, especially in electric furnace steelmaking, to be equipped with 80% of the scrap. Replacing pig iron steelmaking with scrap steel can also shorten the smelting time due to its low content of harmful elements such as sulfur and phosphorus . Lt scrap can produce about 800Kg of good steel, which is equal to the output of lt pig ironmaking steel. With lt scrap steel, you can use less iron ore 3 ~ 5t, coke 500Kg, limestone 300Kg, less mining stone 15 ~ 20t, reduce transportation 30 ~ 40t, reduce energy consumption by 80%, save about 40% of industrial water. With the development of the production of alloy steel, alloy steel scrap resources is increasing. Tools, cutting tools and molds that are scrapped in industrial and mining enterprises contain high alloying elements. For example, lt waste high speed steel contains 180Kg of tungsten, 40Kg of chromium , and 10Kg of vanadium . The sources of scrap steel are as follows: (1) Production returns itself. That is, the bottom of the steel, the bottom of the barrel, the soup, the waste ingot, the waste mold and the slag steel produced in the iron and steel smelting process, as well as the cut and cut ends of the first rolling. (2) Produced in the processing industry. Such as a variety of car scraps, chips, material heads, as well as a variety of trimming and other trim. (3) Machines and tools and supplies that are discarded in production and life. Such as scrapped machinery, tools, parts, discarded knife and rake. Due to manual stopper there are low safety performance, easy operation and so on shortcomings, many coal enterprises on the technical renovation, controlled by pneumatic stopper on and off, for example: permanent coal company, xinqiao coal mine was waiting in the manual type stopper on the transmission shaft of add a piece of chain plate and a cylinder, and the original operating handle, at the same time in them pull rod end place receives a double cylinder hole type, through two air inlet control cylinder stopper on and off.Wing coal group, car fleet set coal mine jian-min cao designed a remote control type pneumatic automatic reset squeezer, processing a down side than the resistance of server-assisted squeezer, rotational torque generated by the weight of the difference on both ends stopper can be automatically reset.Pneumatic stopper compared with manual type stopper operation and safety of all had the very big enhancement, not only reduces the labor intensity of workers, and realizes the remote control, therefore has a tendency to gradually replace manual stopper. Pneumatic Mine Car Arrester,Pneumatic Rail Car Arrester,Mine Car Arrester,Mine Track Arrester Jining Dongda Electromechanical Co.,Ltd. , https://www.coal-mine-equipment.com