英语翻译英文原文Scraper conveyor of the status quo and development trend of technologyAbstract: The Face scraper conveyor of the machine and its head, tail, the central trough, ring linked, soft-start devices, components of the technical status quo and development trend, and made Chinas development scraper conveyor Trend.Key words: scraper conveyor with two, components, development trends.In recent years, with high yield and high efficiency of the rapid development of intensive mine, the coal mine in a mine to achieve a high degree of concentration of wells a production model. Face the long arm as the main transportation equipment, the scraper conveyor transport capability mainly by high yield and high efficiency of the production capacity of the mine to decide, but also determines the scraper conveyor trend of development.1 Technology statusSince the 1980s, both at home and abroad scraper conveyor to the large volume, long distance, high-power, high-intensity, high reliability and long life direction. At present, the largest foreign Fully-face scraper conveyor to transport volume has reached 6000 t / h, installed power 4 800kW, distance 450 m. Domestic independent research and development of the scraper conveyor transport volume has reached 3500 t / h, installed power 3 700kW, distance 300 m. With God East, and other large coal base 400 m face the emergence of China-made scraper conveyor will be moving in the direction of more large-scale. However, volume, distance and the increase of power by many factors. First of all, the height of the central trough should not be too high, otherwise they will be affected with coal effect. Second, the conveyors length should not be too long, Will reduce the rate of advance. Then the most important factors is also key components of the technical performance and life expectancy. Therefore, the scraper conveyor to the development of large-scale, high-performance components of the R & D will become the next scraper conveyor focus on the development, soft-start technology, the status of testing, running state control the use of mechanical and electrical integration technology will be Scraper conveyor into the future development of an important symbol2 Yuan parts of the technical status quo2.1 Head With the fully mechanized coal face of rapidly increasing production apacity, scraper conveyor-unloading has been difficult to meet the requirements of domestic and foreign large volume of heavy scraper conveyor adopt cross-lateral institutions unloaded, the agency after several generations of improvements in the ability to offload , Efficiency, life and other aspects of a big increase. At the same time, unloading a high degree of reduced support for the fully mechanized coal mining has brought convenience.2.2 Tail For long distance, high-power scraper conveyor, the chain tension need greater flexibility trip, both at home and abroad using retractable tail, and is divided into manual and automatic tight chain tight chain. Manual tight chain system is regularly measured by the chain of artificial tension, stretching the tail, which can not guarantee the chain will always be in the best state of tension and the automatic system is the ideal tight chain of tension, as shown in Figure 1. The system in the chain and the nose, tail drive sprocket chain from the bottom, a tension sensor placement, in accordance with the actual chain of take-up tension control the fuel tank. This automatic use of the tight chain, conveyor chain operation will always maintain the best state of tension, to extend the life of the chain, reducing downtime.Figure 1 automatically tensioning system2.3 Sprocket components Sprocket scraper conveyor components is the key component, and its development trend of improving the reliability of sprocket components, the price increase sprocket accuracy, improving heat treatment process to extend the life of sprocket. At present sprocket components in the structure of use of double-row tapered roller bearings, light oil lubrication, nose and tail of the sprocket components are the same, through different gear reducer coupling connection with the replacement of underground Reducer, not demolition; sprocket using high-strength alloy steel, of quenching the hardness to eat HRC55, effective hardening depth of 10 mm and above, the service life of up to 400 to 5 million t of the media. In addition, from sprocket on the tooth to be improved, for example, a company design the GR-sprocket and there is great difference between conventional sprocket, which always has three sprocket tooth led the entire load. 3 tooth contact will inevitably reduce the wear chain and sprocket, thereby extending the life of the chain and sprocket, reducing the chain elongation, power transmission efficiency is higher.2.4 Soft-start devices Foreign advanced conveyor transmission use of soft-start technology, in scraper conveyor on the successful use of the soft-star