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Development and characteristics of air cushion belt conveyors
Air cushion belt conveyor was developed in Holland in 1970s. In the world, the bandwidth of first small air cushion conveyor is 500mm, with a length of about 13m, which has achieved the difficult to reach the indicator, such as the friction factor is reduced to 0.002 ~ 0.02. Subsequently, Holland Sluis company began to manufacture air cushion belt conveyor. Air cushion belt conveyor has gradually attracted people's attention in recent years, the United States, Britain, Russia, Japan and Canada and other countries are stepping up the development and production, the air cushion belt conveyor has dozens of patents. Air cushion belt conveyor is used in the development of bulk material, such as flour, grain and sawdust, and later used for conveying the bulk material, such as phosphate, ore, and so on. At present, the United States TRAMCO company, France STOLZ company have successfully developed an intelligent and efficient air cushion belt conveyor.
As the air cushion belt conveyor has many advantages, it has caused the great interest of scientific research and design units in China. 1985 coal Planning Design Institute in Beijing and Taiyuan Heavy Machinery Institute, Hefei Coal Institute, Northeastern University and Henan Province, Hebi City Taihang machinery factory joint development of this new technology, of air cushion belt conveyor is studied in depth. 2003 Jiangsu developed TRJBC double chamber of large tonnage, energy-saving type air cushion belt conveyor, the conveyor on the base of the large tonnage, high speed, an increase of intelligent control system, and adopts double cushion structure, achieve the effect of energy saving and smooth running. The technology reached the international advanced level, by the Jiangsu Provincial Science and Technology Department No. 436 technical appraisal and application of the technology to produce dual air cushion belt conveyor has been applied in Zhangjiagang, Jiangsu, Guangxi Qinzhou port. At present, there are many manufacturers of air cushion belt conveyor, the products are widely used in coal, electric power, metallurgy, chemical industry, agriculture and port terminals and other fields.
Air cushion belt conveyor is a large number of roller belt conveyor belt conveyor belt roller, the use of ordinary centrifugal blower will have a certain pressure of air supply air chamber. Through the small holes in the gas chamber disk, a layer of stable air film is formed between the gas chamber and the conveyer belt. When the conveyor belt with a fixed velocity, in the gas chamber disk groove and transportation between the undersurface of the form gas friction, the drag conveyor belt resistance is greatly reduced, followed by decline in the power drive, energy-saving effect of significantly.
The main characteristics of air cushion belt conveyor are as follows.
(1) Small running resistance and low energy consumption. The simulation of general belt conveyor is 0.015 ~ 0.035, and the design and manufacture of good air cushion belt conveyor simulation friction factor is 0.006 ~ 0.012, the resistance decreased by about 30%. Horizontal transport of air cushion belt conveyor driving device energy consumption and energy consumption and than common belt conveyor is reduced by 10% ~ 30%, energy saving effect is significant.
(2) The carrying area is increased. Under the same groove angle, the bearing area of the air cushion belt conveyor is basically the same as that of the common belt conveyor, but the air cushion belt conveyor can be used to improve the bearing area under the same bandwidth.
(3) Without roller. Compared with the belt conveyor belt conveyor belt conveyor, the air cushion belt conveyor is more than 25%. Secondly, because the resistance is small, and the air cushion along the direction of transport is continuous, the conveyor belt is stable and not bumpy, so the transmission speed can be greatly improved, the transport efficiency can be increased by more than 1 times.