毕业设计外文翻译--管状带式输送机的参数计算和结构设计

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1、中文 3150 字 英文原文 Parameters Calculation and Structure Design of Pipe Belt Conveyer Zaimei Zhang1, Fang Zhou2, Jianheng Ji2 1School of Mechanical Engineering, University ofJinan, Jinan 250022, Shandong Province,China 2Departments ofInformation Engineering, Shandong Water Vocational College, Rizhao 2768

2、26,Shandong Province, China Abstract: Pipe belt conveyor is a new type of 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 conveyor s main parameters is different from that of convent

3、ional belt conveyor s. The parameters such as throughput, belt speed, belt 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 ofpipe belt

4、conveyor. The structures of them are also discussed. keywords: Pipe Belt Conveyor, Transition Section,Hexagon Supporting Rollers, Tipping Device 1. Introduction Pipe belt conveyor is a new type of special belt conveyor which developed from the conventional belt conveyor. In this conveyor, flat belt

5、is forced to be tubular by supporting roller groups and material conveyed is 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

6、 in Gennany and America and widely used abroad. But it is not deeply studied and its use is much limited in China. 2. The characteristics of pipe belt conveyor Figurel 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 run

7、s through the driven roller and it is conducted by a series of supporting rollers 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

8、. Two-way conveyance can be realized. But tipping device for belt must be added. Characteristics are obvious due to its special structure comparing with other belt conveyor1. (1) Unpolluted conveyance In pipe belt conveyor, material doesnt come out and isnt influenced by environment because the belt

9、 is tubular and the two sides lap over each other. When it conveys powder, food and chemical material etc., this advantage is obvious. (2) Big obliquity of conveyance Obliquity can reach about 18 in the conventional belt conveyor. But in pipe belt conveyor, material is enveloped in pipe and friction

10、 between material and belt is greater than before. So obliquity can be increased to 30 The bigger obliquity is, the shorter conveyance length will be. This can result in lower cost. (3) Two-way conveyance is convenient Belt can be tubular in return of pipe belt conveyor and material can be conveyed

11、in the reverse direction by special device such as special feeder and tipping device. (4) Conveyor bed is narrow In 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 limite

12、d. 3 .Main parameters calculation of pipe belt conveyor Main parameters in pipe belt conveyor are throughput, belt width, belt speed and power. But production throughput is always given. 3.1 Calculation throughput Throughput of conveyor can be fonnulated as follows2: 3600Q VF Where V is belt speed,

13、F is the pipe area, is density of material conveyed and is coefficient of material filling, = 0.44 0.8. 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 thi

14、rds of pipe diameter, =0.44. 3.2 Belt speed Belt speed is determined 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. Thi

15、s will economize on investment in belt and power consumption. Belt speed usually used is 2 5m/s3. 3.3 Belt width Belt width can be calculated according throughput. The belt diameter can be expressed2: 41400 Vd Where d is pipe diameter. The lap of two sides is about one third or half of pipe diameter

16、. When belt is tubular, the relationship between belt width and pipe diameter is as follow: ( (1 / 3 1 / 2 ) )Bd 3.4 Running resistance calculation The method has no difference in resistance calculation between pipe belt conveyor and conventional belt conveyor. Generally, Coefficient of resistance i

17、s 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 resistance in pipe belt conveyor is greater than that in conventional belt conveyor. (1)Resistance in tangent Resistanc

18、e in belt with load2: 0 1 2 0 1( ) c o s ( )W q q q g l q q H g Resistance in belt without load: 0 3 0( ) c o sW q q g l q H g Where W is resistance in running, 0q is the unit mass of belt per meter, 2q is the average unit mass of the upper supporting rollers per meter along the belt, 1q is the unit

19、 mass of material per meter along the belt, 3q is the average unit mass of the below supporting rollers per meter along the belt, l is the length of conveyance, is obliquity of conveyance and is coefficient of resistance in supporting rollers, showed in table 1. Table 1.Coefficient of resistance in supporting rollers