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Service life of long distance conveying system

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Service life of long distance conveying system

[Abstract]:
Belt conveyor has been used for more than 170 years. The earliest belt conveyor was made of leather and other materials. With the development of chemical industry and rubber technology, the belt was m
Belt conveyor has been used for more than 170 years. The earliest belt conveyor was made of leather and other materials. With the development of chemical industry and rubber technology, the belt was made of leather and fiber braided fabric. Cotton braided tape, vinylon tape, nylon tape and wire rope core tape appeared one after another. With the rapid development of continuous conveying technology, belt conveyor is the most economical way to transport large-volume and long-distance logistics. Therefore, long-distance, high-speed and large-volume belt conveyors are more and more used in actual production. However, such large-scale belt conveyor system has huge investment, which is in the millions, tens of millions or even hundreds of millions of yuan. The cost of large-scale belt conveyors abroad ranges from 2 million to 4 million US dollars/km, and that of our country ranges from 8 million to 10 million RMB/km. The belt is the most expensive key component of the belt conveyor. The manufacturing cost of ordinary belt is about 30%-40% of the total cost of the whole belt conveyor. The cost of steel cord belt is higher, and the cost of depreciation and maintenance is also higher. Therefore, solving the problems in the design and operation of belt conveyor, preventing the tear and deviation of belt, prolonging its service life and improving the safety and reliability of equipment will achieve good economic and social benefits. The conveyor belt of belt conveyor is not only a traction device for transmitting power, but also a bearing component for supporting materials. Therefore, in addition to the manufacturing quality factors of the conveyor belt itself, the factors affecting its service life include how the conveyor belt transmits power and how to support materials.
 
 
 
1 drive unit
 
 
 
For long distance, high belt speed and large capacity belt conveyor, its driving power is very large. If a driving unit is used to drive the whole belt, the unit power must be increased. According to the relevant information, some power up to 2000 kW (Fortuna mine, Germany), such a large power, the start-up and braking of the drive unit has become a very important issue, especially for the underground coal mine, and the intensity of the conveyor belt restricts its use. Multipoint drive can make up for this defect. Therefore, multipoint drive is widely used. It has created technologies such as multi-point rolling drive, linear friction drive, driving roller, pneumatic tire friction drive and linear motor drive. Secondly, in the multi-point drive, the speed-regulating hydraulic coupling should be used to realize the slow start of the conveyor, so as to reduce the sliding force of the material during the start, avoid the danger of rolling and damage the belt surface.