《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-其他专业.docx》由会员分享，可在线阅读，更多相关《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-其他专业.docx（15页珍藏版）》请在taowenge.com淘文阁网|工程机械CAD图纸|机械工程制图|CAD装配图下载|SolidWorks_CaTia_CAD_UG_PROE_设计图分享下载上搜索。
1、中文4410字英语翻译英文原文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 s
2、craper 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
3、 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 scrape
4、r 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 deve
5、lopment 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 in
6、crease 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 th
7、e 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 mech
8、anical 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
9、 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
10、 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.
11、 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
12、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,
13、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
14、 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 demol
15、ition; 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
16、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 i
17、s 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-start main valve control device-filled hydraulic coupler, CST controllable start and the exchange of electrical transmission system, such as Freq
18、uency 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-filled hydraulic valve control coupled with th
19、e 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 multi-drive can be achieved un
20、der 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 through the pump row, row of pr
21、essure 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 coupler2CST controlled trans
22、mission 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 mor
23、e 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; be running low on time, and cashing in on the trend post-mortem chain; scene debugging simple, it is easy to modif
24、y the parameters online and debugging.2.4.3 AC motor technology the main technical characteristics and other soft-start mode compared to the full realization of electrical soft-start control, scraper conveyor drive system and power supply system to maximize the simplification; start-up time can be l
25、oaded with self-regulation; achieved a scraper conveyor loaded with empty and the smooth start-up; significantly reduce the starting current and improve the quality of electricity supply grid, power grid to reduce impact.2.5 Central groove Central trough conveyor of the whole face of the trunk, its
26、life is a measure of an important indicator of life. At present the central trough use of trough-shaped cross section for the whole cast back cover welding structure, life expectancy has reached 10 million t. To further improve the service life of the major manufacturers of domestic and foreign cent
27、ral trough of form, structure and materials have done a great deal of research. Such as Germany of a company through research and development, be that in different sections of the mine shafts for a large number of Central Test and eventually found, and trough-shaped cross section for comparison, cur
28、ved section slot for the scraper to help with the trough in contact with the side of the small, thereby reducing friction and reduce power consumption, extend the central slot and scraper life. scraper and arc-shaped cross section and the section for surface trough comparison shown in Figure 3.Figur
29、e 3 scraper and arc-shaped cross section and the section for surface trough comparisonFrom top to bottom for a slot on the design, shown in Figure 4, from top to bottom slot for the same, you can choose any thickness and width of the plate in the central trough design makes for greater flexibility.
30、Slot for each board and the central slot between the two Weld, the central side of the trough of four seam, only on the inside of the tank to help withstand the wear and tear a seam, even if it was polished welds , The central trough can maintain a high degree of stability.Figure 4 4-steel tank to h
31、elp design and wear contourHelp create a slot on the Rolling materials, steel rolling on the surface than the smooth casting of steel, small friction. Central tank plate using high-strength steel hardening Wear-resistant, wear little. Rolling in the central trough lateral welding dumbbell Block, wil
32、l not help reduce the thickness of groove. Forging dumbbell on the design and ensure that the central trough Yaling not Block damage, and the youngest is basically breaking strength of 1.5 times the dumbbell, so the fault is always the first dumbbell. Another trough of the central structure of the t
33、ank from top to bottom-of-duplication, this form can be set from top to bottom groove and the failure of different conditions for different structural design and material selection, and easy on the replacement tank, will help improve strength and Life. The central trough in the form of SGZ880 / 2 40
34、0-type double-stranded in the cross-side dumping in the face scraper conveyor has been successfully applied. 2.6 Ring linked Circle as a scraper conveyor chain of traction, its tensile strength directly related to the reliability of. At present, Chinas largest ring linked to 42 mm 146mm compact chai
35、n, tensile strength of 2270 kN, the largest foreign ring linked to 48 mm 152mm compact chain, tensile strength of 3550 kN. With the ring linked the increasing size of the central trough of higher and higher, conveyor magnificent performance declined, the gateway if not thorough clean-up will also af
36、fect passage of conveyor. So ring linked the direction of development is to improve tensile strength and reduce the high degree of Central legislation.2 Materials and Technology In order to improve the roundabout chain of tensile strength, the current foreign Grade C and D-linked ring in the large-s
37、ized materials with 23 MnNiCrMo54, 23MnNiCrMo54 and 23 MnNiCrMo64 scouring steel, tensile strength limit 1600 1800 MPa. Welding Technology: the use of advanced welding equipment, welding and the use of flash returns processing technology, successfully resolved the surfacing of the process of overhea
38、ting, such as a burning issue. In quality testing, the use of scanning stretch fracture fracture of cables used to pre-tension ring linked to strengthen technology, greatly enhancing the carrying capacity and fatigue.2 form and geometry In 1985 the first to create a company 38 mm 137mm flat chain. F
39、lat is linked each of the chain is still ring-Central, Central was squeezed the flat ring. Flat chain link sliding work to reduce the size of the increase in the chain of slot pressure on the units and improve the legislation of the Central wear resistance; reduce its high level of the chain more ea
40、sily through the sprocket, but can also reduce the capacity of power transmission and Bays of a high degree. Modern high-performance conveyor are generally involved in supporting a flat chain. Figure 5 conventional chain and a new wide-body linked flatIn 2003, the company has developed a wide-body a
41、t a flat linked, as shown in Figure 5. It is a high-intensity, low-chain, has the following characteristics: using this chain can reduce the high scraper chain, thereby reducing the central trough height, eventually reduce the use of high-mining, coal mining to meet thin. using this chain can reduce
42、 the use of power, or power in the same circumstances, increase the length of face, it will greatly reduce the workload of opening up, reducing the number of face move. this forging of wide-body flat link chain has increased the contact area, can improve the chain link at the same time reduce the in
43、tensity of the wear and helps to maintain the rigidity of chain link. Such as a flat 42 mm chain can take 2 855kW of installed power, and 50 mm wide-body flat can be linked up to 3 1000kW bear the installed power.2 intelligent conveyor chain As unable to accurately predict the failure of the chain,
44、according to conventional practices are generally ahead of the replacement of the chain. In 2005 a company with a number of research institutes to study the development of a conveyor chain-detection system, as shown in Figure 6. This is a combination of integrated sensor technology of intelligent co
45、nveyor chain, it will stress the chain of real-time record, the help of micro-electronics technology devices, from computers that the chain of life remaining before the fracture. It also can detect the chain of preload, is conducive to life during the period in the chain to achieve the best use of s
46、tate, improve safety and avoid accidents.2.7 The link chain The link chain-rings are used for the link chain and ring for legislation to link the two in recent years has tended to adopt legislation to link the ring, then such a chain link through the sprocket and not linked A round of contacts, so t
47、here will not be worn.Blockmaster the link chain is a new legislation for a flat linked to the Central chain link shown in Figure 7, because of their extreme length of closure, at the time of installation without relaxation chain; their innovative design concept, two-way installation, do not have to
48、 consider the direction of transmission, There is the possibility of anti-loaded, the link chain block in central lock can be avoided chain kink, but also increased the strength of the link chain, such as 42 mm 146mm Blockmaster the link chain of broken Rally of 2500 kN.Figure 6 smart conveyor chain
49、2.8 High-power transmission gearScraper conveyor of the low-speed transmission is characterized by heavy, impact resistance, small in size but poor lubrication and cooling. In order to obtain high-performance gear transmission device, to be constantly raise the level of product and manufacturing standards involved. Figure 7 Blockmaster the link chain2 raising the level