外文翻譯--管狀帶式輸送機(jī)的參數(shù)計(jì)算和結(jié)構(gòu)設(shè)計(jì)-展示頁
2024-12-18 05:18本頁面
【正文】 nvestment in belt and power consumption. Belt speed usually used is 2～ 5m/s[3]. Belt width Belt width can be calculated according throughput. The belt diameter can be expressed[2]: 41400 Vd ???? Where d 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 is as follow: ( (1 / 3 1 / 2) )Bd??? Running resistance calculation The 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 resistance in pipe belt conveyor is greater than that in conventional belt conveyor. (1)Resistance in tangent Resistance in belt with load[2]: 0 1 2 0 1( ) c os ( )W q q q gl 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 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 of resistance in supporting rollers (2) Resistance in curvature Resistance in curvature is caused by belt ossification and friction in roller bearings. It is proportional to the tension at curvature entrance. That is[2] : 1iiS CS?? Where iS is the tension in belt at curvature exit, 1iS? is the tension in belt at curvature entrance and C is coefficient of resistance. Tension calculation in belt After resistance in each section has been calculated, we can calculate the tension at every point. We can divide whole path into several tangents and curvatures and number every joint before we calculate. Tension at any point is calculated by the formula as followed[2]: 1 ( 1)i i i iS S W???? Where iS and 1iS? are tension in belt at point i and point 1i? , ( 1)iiW? is resistance between point i and point 1i? . The tension at driving roller entrance and driving roller exit can be obtained. Circumferential force on driving roller can be described by following expression: 1nP S S?? Where P is circumferential force on driving roller, nS is the tension in belt at driving roller entrance and 1S is the tension in belt at driving roller exit. The following condition must be satisfied because the belt do not permitted to slide on driving roller[2]. 1nS Se??? Where ? is the coefficient of friction between the belt and driving roller, ? is angle of the belt enveloping on the roller. Power calculation Power is mainly consumed in overing running resistance. And some power is used in elevating material in sloping conveyor. Power on driving roller shaft can be calculated by the follower expression[2]: 0 1000PVN ? So the motor power is: 0KNN ?? Where K is a factor of safety and ? is transmission device efficiency. 4 Structure design of pipe belt conveyor The length of transition section Figure 2 Length of transition section Transition section is shown in
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