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)(編輯修改稿)
2025-01-11 05:18 本頁面
【文章內(nèi)容簡介】 on 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 figure 2. The belt is flat at driving roller and driven roller. The belt is turned from flat belt into tubular one at transition section. The length of transition depends on the permissible extension of belt. If transition section is too short, additional deformation and stress will be great in both sides of belt. This will result damage to belt. If transition section is too long, distance of airproof conveyance in whole line will be shortened. Generally speaking, the length of transition section equals to 25 diameters in nylon belt while 50 diameters in wire rope belt[3]. Design of supporting rollers Parallel supporting rollers must be used near driving roller and driven roller so that the angle of the belt enveloping on the roller is big enough. But at other position in transition section trough supporting rollers are used. Thus the flat belt can bee tubular one gradually and additional stress at edge of belt can be reduced. So trough angle is usually 20176。,30176。 ,45176。 ,60176。 and 90176。. Since impact load at material entrance is inevitable, three groups of cushioning supporting rollers can sever to reduce the intensity of shock loads and its39。 spacing is about 300～ 500mm[4]. Hexagon supporting rollers are widely used after the flat belt bees tubular onel5J ? Rollers can be equipped on the same side or two sides of the supporting board. is easy to positioning rollers precisely and the force in belt is uniform when the six rollers are equipped on the same side of supporting board. Generally speaking, the adjacent rollers spacing should not exceed the belt thickness, usually 4～ 8mm. If the spacing were too big, the edge of belt would jam in it. There are three rollers on each side of the supporting board when rollers are equipped on two sides of it. The length of roller can be longer than the length of hexagon side and the belt can not jam in the space of adjacent rollers. On the other hand, the force in supporting board is uniform. Rollers on supporting board are shown in and . Figure 3 .Rollers on same side of suppporting board Figure 4. Rollers on two side of suppporting board Rigidity is greatly increased after flat belt bees tubular. So supporting rollers spacing can also be increased. Supporting roller groups spacing with load is about or and it is in return in conventional conveyor, while it varies with the pipe diameter in pipe belt conveyor. The greater pipe b diameter is, the greater the spacing is[5]. The relationship etween pipe diameter and the spacing is shown in table 2[5]. Table 2. The relati
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