外文翻譯--帶式輸送機技術(shù)的最新發(fā)展（英文）

1、Latest Developments in Belt Conveyor Technology M. A. Alspaugh Overland Conveyor Co., Inc. Presented at MINExpo 2004 Las Vegas, NV, USA September 27, 2004 Abstract Bulk material transportation requirements have conti

2、nued to press the belt conveyor industry to carry higher tonnages over longer distances and more diverse routes. In order keep up, significant technology advances have been required in the field of system design, an

3、alysis and numerical simulation. The application of traditional components in non-traditional applications requiring horizontal curves and intermediate drives have changed and expanded belt conveyor possibilities. Ex

4、amples of complex conveying applications along with the numerical tools required to insure reliability and availability will be reviewed. Introduction Although the title of this presentation indicates “new” developme

5、nts in belt conveyor technology will be presented, most of the ideas and methods offered here have been around for some time. We doubt any single piece of equipment or idea presented will be “new” to many of you. Wha

6、t is “new” are the significant and complex systems being built with mostly mature components. What is also “new” are the system design tools and methods used to put these components together into unique conveyance sy

7、stems designed to solve ever expanding bulk material handling needs. And what is also “new” is the increasing ability to produce accurate computer simulations of system performance prior to the first system test (com

8、missioning). As such, the main focus of this presentation will be the latest developments in complex system design essential to properly engineer and optimize today’s long distance conveyance requirements. The four

9、 specific topics covered will be: ? Energy Efficiency ? Route Optimization ? Distributed Power ? Analysis and Simulation Energy Efficiency Minimizing overall power consumption is a critical aspect of any project

10、 and belt conveyors are no different. Although belt conveyors have always been an efficient means of transporting large tonnages as compared to other transport methods, there are still various methods to reduce power

11、 requirements on overland conveyors. The main resistances of a belt conveyor are made up of: ? Idler Resistance ? Rubber indentation due to idler support ? Material/Belt flexure due to sag being idlers ? Alignmen

12、t These resistances plus miscellaneous secondary resistances and forces to over come gravity (lift) make up the required power to move the material. 1 Latest Developments in Belt Conveyor Technology

13、 MINExpo 2004, Las Vegas, NV, USA M.A. Alspaugh, Overland Conveyor Co., Inc. September 27, 2004 The longest conveyor

14、 in this system (PC2) was 16.28 km in length with 475m of lift. The most important system fact was that 50% of the operating power (~4000 kW at 1783 mtph and 4.6 m/s) was required to turn an empty belt therefore powe

15、r efficiency was critical. Very close attention was focused on the idlers, belt cover rubber and alignment. One way to document relative differences in efficiency is to use the DIN 22101 standard definition of “equiv

16、alent friction factor- f” as a way to compare the total of the main resistances. In the past, a typical DIN f used for design of a conveyor like this might be around 0.016. MAN Takraf was estimating their attention to

17、 power would allow them to realize an f of 0.011, a reduction of over 30%. This reduction contributed a significant saving in capital cost of the equipment. The actual measured results over 6 operating shifts after

18、commissioning showed the value to be 0.0075, or even 30% lower than expected. Mr. Kung stated this reduction from expected to result in an additional US$100, 000 savings per year in electricity costs alone. Rout

19、e Optimization Figure 5- Tiangin China Horizontal Adaptability Of course the most efficient way to transport material from one point to the next is as directly as possible. But as we continue to transport longer distan

20、ces by conveyor, the possibility of conveying in a straight line is less and less likely as many natural and man-made obstacles exist. The first horizontally curved conveyors were installed many years ago, but today

21、it seems just about every overland conveyor being installed has at least one horizontal change in direction. And today’s technology allows designers to accommodate these curves relatively easily. Figures 5 and 6 show

22、s an overland conveyor transporting coal from the stockpile to the shiploader at the Tianjin China Port Authority installed this year. Designed by E.J. O’Donovan & Associates and built by Continental Conveyor Ltd

23、of Australia, this 9 km overland carries 6000 mtph with 4x1500 kW drives installed. R3000R400024°36° Capacity: 6000 mtph Length: 8980 m Lift: 8 m Belt Width: 1800 mm Belt Speed: 5.6 mpsHeadTailFigure 6- T

24、iangin China Plan View The Wyodak Mine, located in the Powder River Basin of Wyoming, USA, is the oldest continuously operating coal mine in the US having recorded annual production since 1923. It currently utilizes a

25、n overland (Figure 7) from the new pit to the plant 756m long (2,482 ft) with a 700m (2,300 ft) horizontal radius. This proves a conveyor does not need to be extremely long to benefit from a horizontal turn. 3 Figure

26、 7- Wyodak Coal Tunneling Another industry that would not be able to use belt conveyors without the ability to negotiate horizontal curves is construction tunneling. Tunnels are being bore around the world for infrast

27、ructure such as waste water and transportation. The most efficient method of removing tunnel muck is by connecting an advancing conveyor to the tail of the tunnel boring machine. But these tunnels are seldom if ever