工作面刮板输送机技术现状与发展趋势毕业论文外文翻译

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1、 1 中文 4410 字 英语翻译 英文原文 Scraper conveyor of the status quo and development trend of technology Abstract: 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 deve

2、lopment 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 t

3、he 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 status Since the 1980s, both at home and

4、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 rese

5、arch 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, distan

6、ce 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 com

7、ponents 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 th

8、e use of mechanical and electrical integration technology will be Scraper conveyor into the future development of an important symbol 2 Yuan parts of the technical status quo 2.1 Head With the fully mechanized coal face of rapidly increasing production apacity, scraper conveyor-unloading has been di

9、fficult 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 2 offload , Efficiency, life and other aspects of a big increase. At the same time, unload

10、ing 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

11、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

12、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 l

13、ife of the chain, reducing downtime. Figure 1 automatically tensioning system 2.3 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 treatme

14、nt 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 undergroun

15、d 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

16、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 trans

17、mission efficiency is higher. 2.4 Soft-start devices Foreign advanced conveyor transmission use of soft-start technology, in scraper 3 conveyor on the successful use of the soft-start main valve control device-filled hydraulic coupler, CST controllable start and the exchange of electrical transmissi

18、on system, such as Frequency Control . Because there is no domestic mature technologies and products, the China-made high-power scraper conveyor used in soft-start device for all imported products. Figure 2 was developed by Germany-filled hydraulic valve control DTP coupler. 2.4.1-filled hydraulic v

19、alve control coupled with the principal technical characteristics can achieve the empty scraper conveyor start and overload protection； Change can be achieved through scraper conveyor the frequent start, without limitation start frequency； through hydraulic coupler divisions will also re-order the m

20、ulti-drive can be achieved under the load balancing； slow post-mortem can be linked； dual-chamber design, compact, power transmission components without mechanical contact, high reliability. with water as a working fluid, safe and convenient and cheap, through pipes or water supply, drainage tube th

21、rough the pump row, row of pressure from the main hydraulic motor-driven cycle produced by the pilot of the portfolio directly to the valve To control the water cycle； without affecting the power transmission circumstances, * Change to heat through. Figure 2 DTP-valve-controlled oil-filled hydraulic

22、 coupler 2.4.2CST controlled transmission system activated the main technical characteristics in any load can track any launch curve, the speed of plus or minus any adjustment； relative speed hydraulic coupler, the transmission efficiency； an arbitrary controlled under the conditions of parking capacity； can be driven to achieve more balance of power between the high-precision, balance accuracy up to 98 percent； conveyor of all mechanical, electrical system overload protection, the protection system fast response；