1、翻译部分英文原文Zaimei Zhang1, Fang Zhou2, Jianheng Ji21School of Mechanical Engineering, University of Jinan, Jinan 250022, Shandong Province,China2Departments of Information Engineering, Shandong Water Vocational College, Rizhao 276826,Shandong Province, China Abstract: Pipe belt conveyor is a new type of
2、 special belt conveyor and it is wildly used in conveying powder material. In the paper, the advantages of pipe belt conveyor are introduced. Calculation of pipe belt conveyors main parameters is different from that of conventional belt conveyors. The parameters such as throughput, belt speed, belt
3、width, resistance, tension in belt and power are described. The length of transition section is analyzed because it is important to the belt life. Hexagon supporting rollers and tipping device are necessary parts of pipe belt conveyor. The structures of them are also discussed.keywords: Pipe Belt Co
4、nveyor, Transition Section,Hexagon Supporting Rollers, Tipping Device 1. IntroductionPipe belt conveyor is a new type of special belt conveyor which developed from the conventional belt conveyor. In this conveyor, flat belt is forced to be tubular by supporting roller groups and material conveyed is
5、 enveloped in it. Therefore airproof convey is realized in whole conveyance line. Pipe belt conveyor was proposed in 1964 by Japan Pipe Conveyor (JPC), and it went into real use in 19791 .After that, it was rapidly developed in Gennany and America and widely used abroad. But it is not deeply studied
6、 and its use is much limited in China.2. The characteristics of pipe belt conveyorFigure l is for the structure of pipe belt conveyor. The load is putted on by the feeder at the end of conveyor.The belt is flat when it runs through the driven roller and it is conducted by a series of supporting roll
7、ers to be tubular gradually. Thus airproof conveyance is realized. In order to discharge, the pipe is also conducted by a series of supporting rollers to be flat near the driving roller. The conveyor discharges at its head. Two-way conveyance can be realized. But tipping device for belt must be adde
8、d. Characteristics are obvious due to its special structure comparing with other belt conveyor1. (1) Unpolluted conveyanceIn pipe belt conveyor, material doesnt come out and isnt influenced by environment because the belt is tubular and the two sides lap over each other. When it conveys powder, food
9、 and chemical material etc., this advantage is obvious. (2) Big obliquity of conveyanceObliquity can reach about 18 in the conventional belt conveyor. But in pipe belt conveyor, material is enveloped in pipe and friction between material and belt is greater than before. So obliquity can be increased
10、 to 30 .The bigger obliquity is, the shorter conveyance length will be. This can result in lower cost. (3) Two-way conveyance is convenientBelt can be tubular in return of pipe belt conveyor and material can be conveyed in the reverse direction by special device such as special feeder and tipping de
11、vice.(4) Conveyor bed is narrowIn conveyance, bed is narrow because the cross section is a circle. The required building space and building steel are reduced. The bed cost is low and it can be used when space is limited.Figure 1. Structure of pipe belt conveyor3 .Main parameters calculation of pipe
12、belt conveyorMain parameters in pipe belt conveyor are throughput, belt width, belt speed and power. But production throughput is always given.3.1 Calculation throughputThroughput of conveyor can be formulated as follows2:Where is belt speed, is the pipe area, is density of material conveyed and is
13、coefficient of material filling, = 0.440.8. If material size is less than one third of pipe diameter, =0.8. If material size is one third of pipe diameter, =0.75. If material size is half of pipe diameter, =0.58. If material size is two thirds of pipe diameter, =0.44.3.2 Belt speedBelt speed is dete
14、rmined by characteristic of material, throughput, belt width and the installation method of conveyor. Generally speaking, quick belt speed is beneficial because it can reduce belt width and tension in belt when throughput is constant. This will economize on investment in belt and power consumption.
15、Belt speed usually used is 25m/s3.3.3 Belt widthBelt width can be calculated according throughput. The belt diameter can be expressed2:Where is pipe diameter.The lap of two sides is about one third or half of pipe diameter. When belt is tubular, the relationship between belt width and pipe diameter
16、is as follow:3.4 Running resistance calculationThe method has no difference in resistance calculation between pipe belt conveyor and conventional belt conveyor. Generally, Coefficient of resistance is usually used in resistance calculation. Tension in belt is calculated point by point. Extrusion force is increased because material is enveloped in pipe. Therefore coefficient of resi
