刮板输送机刮板间距的优化分析外文文献翻译、中英文翻译

1、英文原文Optimization Analysis Of scraper Spacing Of Scraper ConveyerAbstract The size of scraper spacing affects the efficiency of the scraper conveyer transportation Therefore, it is necessary to determine the scraper spacing reasonably. In this paper, a rather comprehensive equation of scraper thrusti

2、ng force is obtained by the analysis of the process under stress when the scraper moves the material in the load side of the scraper conveyer and the consideration of the friction force that both sides of the material triangular prism body in the scraper get.Afterwards, the formula that describes th

3、e scraper spacing is deduced and the factors which affect the scraper spacing are analyzed. And the relationships between the scraper spacing and both the scraper chain and material movement resistance in the load side and the chain movement resistance in the non-load side of the scraper conveyer ar

4、e analyzed. Then the optimization of scraper spacing is fulfilled which minimizes the resistance of operation.Keywords Scraper spacing; Load side; Triangular prism body.1 IntroductionThe scraper conveyer is the key equipment of the full meclhanization working surface. Due to the development of the e

5、quipment manufacture technology, the working surface scraper conveyer is required to have high efficiency output, high transport capacity, longer transportation distance,and higher reliability. But the scraper spacing can affect the efficiency of entire transportation process.Since the scraper conve

6、yer movement working condition is bad, if scraper spacing is oversized, the chain link stretching may cause the center chain link in the strake to stretch and to skid, which leads to the stretching of the next scraper and the unloading coal board to have the chain stopped, or even broken down. There

7、fore, to determine a reasonable scraper spacing is important under the consideration of improving the transportation efficiency and the prevention of occurring accident of chain broken.The former research on the scraper spacing lacks the systematical and theoretical analysis. Many factors are neglec

8、ted during the deduction of the scraper spacing equation, especially the process of conveyer scraper pushing the material. The influence of the friction force borne by the material triangular prism body between both the scraper sides is significant and can not be neglected. Due to . this factor, the

9、 stress analysis of pushing the material to the scraper is carried out again. Under the condition that the material between two scrapers is stable, the scraper spacing formula of the maximum value of the scraper spacing is obtained. And afterwards, the influence factor is analyzed,and scraper spacin

10、g is optimized.Fig.1 Free body schematic diagram of triangular prism body2 Stress analysis of the scraper pushing the materialOn the scraper conveyer load carrying side,conveyer scraper moves, pushing material to move,thus realizing material delivery. Friction forces exist between the materials tria

11、ngular prism body and the scraper on its sides.In the stress analysis diagram that shows the scraper buried in the material pushes the material to move,h represents the scraper height, F stands for the thrust, and a stands for the conveyer longitudinal arrangement inclination angle. According to bul

12、k mechanics principle, when the thrust forces ofpushing board AB surpass the marginal value, the theoretical balance of bulk material in front of the pushing board will be destroyed. Then, relativeskid will occur inside the material, triangular prism body ABC will be pushed forward as a whole,triang

13、ular prism body ACD will slip along line AC,line CD and line AD, and triangular prism body ACD will be increasingly elevated in the process of slipping, thus producing a new stable state. 0 and0, are angles of friction that can maintain the balance of bulk material. Next we will study the relationsh

14、ip between 0, 0q and F. Suppose the width of the scraper AB is B, schematic diagrams for triangular prism body ABC and ACD are drawn respectively, each arr is surface bears positive pressure N and the friction force N, (corresponding signs are shown in Fig.1). Because the working line of friction fo

15、rce on the four triangle surface ADC,ADC, ABC and ABC parallel with that of thrust force F and positive pressure on each arris surface in Z axis direction parallel with each other,we draw diagram of triangular prism body as in Fig.2.Fig.2 Free body diagram of triangular prism bodyFrom force balance

16、of triangular prism body ACD with the length of B,we deduce:(1)From force balance of triangular prism body ABC with the length of B,we deduce： (2) represents the total friction force of the two surface of triangular prism body，and. If the height of material is the same， (3)In this formula， refers to

17、 density of bulk material ，；refers to lateral coefficient of bulk material；g refers to acceleration of gravity，；，refers to friction coefficient in materials；refers to friction coefficient between coal and steel；，。The following analysis is the same with above： (4) (5) (6) (7)Introducing middle variab

18、le or constant equation： (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20)The above equation can deduce： (21)which is to maintain the balance of bulk material is：；here，：can be deduced fromcan deduce the value of，. Bring them to equation（5），then wen can extract 。Suppose that the scraper

19、spacing is L, to ensure the stability of material between the two scrapers,the thrust force of the scraper should be maintained lower than , So: (22)According to the above formula, Lets analyze the relationship between a, h and H.From Fig.3, when h is 0.114m and other parameters remain unchanged, wi

20、th the accretion of H, Lmax tends to horizontal. When a is , ;when is , ;when is , From Fig. 4, when a is , and other parameters remain unchanged, with the accretion of H, tends to horizontal.When h is 0.114m, ;when h is 0. 090, ; when h is 0.150,.Fig.3 Variation of with that of and HFig.4 Variation

21、 of with that of and H3 Analysis and calculation of chain operation resistance on loaded andnon-loaded sideAnalysis and Calculation mainly cover:scraper chain and materials moving ( under the non-stable condition) resistance on loaded side, chain moving resistance ( considering the condition of mate

22、rials move into non-loaded strake) on non-loaded side3.1 Chain moving resistance on loaded side under non-stable conditionThe condition under which the stability of material is maintained and the material can run with scraper chain at the same pace is: . If ,the two will be at the critical state. If

23、, the materials can not run with the scraper chain at the same pace and the scraper will run through the materials. At this stage, the resistance borne by the scraper is:. Under non-stable working condition,we can calculate the moving resistance on loaded side at unit length:At stable running state.

24、(23)In the above. equation: W stands for moving resistance at unit length. N;.stands for the weight of scraper mass at unit length and materials mass, kg/m.stands for quantum friction coefficient. stands for conveyer angel with up moving positive and down moving negative., stand for friction coeffic

25、ient of steel against steel,coal against steel and coal against coal respectively.stands for density of bulk materials -kg/m. stands for side stress coefficient. H stands for material height. h stands for scraper height.Under non-stable condition:(24)In the above equation: stands for scraper space,B

26、 . b stands for upside ( or downside) area of the scraper,m ;B stands for scraper length, m;b stands for scraper width, m. Other symbols are the same as those of the previous parts. 3.2 Chain operation resistance on loaded sideIf there is no material in the strake on non-loaded side, it is simple to

27、 calculate its resistance. That is,. But during the moving process of the scraper chain, the material is often carried into the return side. Especially, because the chain on the return side moves in closed strake trunk, the side unload scraper conveyer may move in two ways, as shown in Fig. 5 In Fig

28、. 5 (a), middle board is not pressed by materials, and in this condition W is:(9)Fig.5 Working condition with material in return side naterial weight at until length-kg/m.Fig.6 Pressure distributing schematic drawing for matervialsFig.5 (b) shows the state that middle board is pressed by materials.

29、Stress distribution is shown in Fig.6.According to bulk mechanics theory,suppose every strake s weight is , kg and unit weight of the chain is , kg/m; then Fig.7 Working resistance permeter on the scraper coveyor(25)Suppose,then,.Fig.7 demonstrates two relationship curves of scraper chain operation

30、resistance and scraper space. From Fig. 7, we can see that when, the operation resistance changes dramatically.And when the operation resistance becomes bigger, the whole transmission efficiency becomes lower accordingly. So when the operation resistance is minimum, namely when L, 1m,operation resis

31、tance at unit length is the least and efficiency is the highest. This is optimized scraper space.Conclusions(1)Wehaveanalyzedthestress process inwhich the load-side scraper of the scraper conveyer pushes the material to move, taking into consideration the friction force which is borne on two sides o

32、f the block, obtained a more comprehensive scraper thrust force equation, and deduced a formula for the maximum scraper spacing; (2) We have analyzed the altering tendency of scraper spacing, taking account of the influence of the conveyer longitudinal arrangement inclination angle , the scraper hei

33、ght and the material height.When ，；当when h=0114m，；(3) Under non-stable working conditions where the moving resistance of the loaded side and the non-loaded side chain of the scraper conveyer plays on scraper spacing, when operation resistance is the least, namely unit length operation resistance is

34、the smallest and the transmission efficiency is the highest.References1 J. Mao, G. X. Li., Research on dynamic action analysis and controlling theory of scraper conveyer,Liaoning University Press, (2006).2 I X. R. Zhong, New calculating method of scraper conveyer moving resistance. Coal technology,

35、(11)46-48, (2005).3 C. Fu. Design and calculation for scraper conveyer,interiorliterature, (1997).4 Prof. Dr. -lng,Dr. mont, Dr. techn, Die Mechanik des Forderers ( Teil I). Bernhard Sann, AachenFordertechnik. bergbaul/81.5 Prof. Dr. -lng, Dr. mont, Dr. techn, Die Mechanik des Forderers ( Teil I ).

36、Bernhard Sann, Aachen Fordertechnik. bergbau4/81.中文翻译刮板输送机刮板间距的优化分析摘 要刮板间距的大小影响的刮板输送机效率，因此，有必要合理的确定刮板间距。在本文中，一个刮板推力方程是获得刮板链移动时与刮板三角柱摩擦时产生的摩擦力的方程。然后，这个方程是描述刮板输送机的推论和分析刮板间距的影响因素。分析刮板间距和在负荷端刮板链的抵抗能力与在非负荷端刮板链的抵抗能力的关系。实现刮板输送机运行时抵抗能力最小的刮板间距优化。关键词 负荷端，三角柱1 正文刮板输送机是完全机械化工作面的重要机械。由于装备制造厂的工艺发展，工作面刮板输送机需要有高效率输

37、出，高输送能力，较长的运输距离和高可靠性。但是刮板输送机影响到了全部运输过程的效率。如果刮板间距过大，刮板输送机的工作状态会更差。链节的弹性伸展导致链节的中心拉长到底板和滑向一侧，并且导致下一个刮板拉长和卸煤板断掉。因此，链停止，在考虑改进迁移效率和防止链条断裂的状态下确定适当的刮板间距非常重要。前者研究刮板间距缺乏系统性和理论性分析。在刮板间距方程的推论过程中许多因素被忽略了，尤其是刮板推送材料的过程。三角柱的材料有着重要的影响，对于刮板来说是重要的和不可被忽略的。由于这个因素，推料刮板的应力分析又一次被完成。在这个状态下材料稳定的保持在刮板的中间。刮板间距的最大值通过刮板间距方程式得到。然

38、后，分析影响因素，并且优化刮板间距。图1三角柱自由体示意图2 推料刮板应力分析在刮板输送机负荷运行面，刮板输送机移动，推动材料移动，如此准确的传送材料。摩擦力存在于刮板输送机的三角柱和刮板间。在应力分析图中展示出显示了埋刮板材料推料移动，h表示刮板的高度，F表示推力。以及为输送站纵向安排散装倾向。根据力学原理，当推板AB的推力超出临界值时，推板前端的粒装物料的平衡理论被破坏。然后，在材料里发生相对的打滑，三角柱ABC被整个推进。三角柱ACD沿着线AC，线AD和线CD滑移，三角柱ACD在滑移过程中渐渐的提高，如此产生一个新的稳定状态。摩擦角和保持物料的平衡。然后我们研究摩擦角，和F的关系。假设刮

39、板AB的宽度是B，分析画出三角柱ABC和三角柱ACD的原理图，每个棱角面都承担正压力N和摩擦力（在图1中对应的标出）。因此四个三角柱ADC，ADC ，ABC和 ABC的摩擦力工作线与推力F做比较。Z轴方向上每个棱面上的正压力互相比较。图2刮板推移物料受力平衡在中我们画出了三角柱的图解。从从长度为B的三角柱体ACD受力平衡，我们推断：(1)从长度为B的三角柱体ABC受力平衡，我们推断： (2)是三角柱两端面摩擦力之和，并且。如果材料的高度一样， (3)在这个方程中，为散体物料的密度，；为散体物料的侧压系数；g为重力加速度，；，为物料间的内摩擦系数；为物料与钢之间的摩擦系数；，。下面的分析同上：

40、(4) (5) (6) (7)引入中间变量或常量方程： (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20)上述公式得出： (21)是保持材料平衡的最大值为：；推论，：从推论出变量，。带入方程（5），我们提出。假设刮板间距为L，确保两个刮板器之间的物料稳定性，刮板推力应保持低于，因此： (22)根据上述公式，带入分析，h 和 H的关系。从图3可知，当h是0.114米及其他参数保持不变，H的增大，趋于水平。当；当是时，；当是时，。从图4可知，当是时，及其他参数保持不变，H的增大，趋于水平。当h是0.114米时，；当h是0.090米时，；当h是0.150米时，。图3随着和变化规律图4随着h和变化规律3、链上负载和非负载端运行阻力计算与分析分析和计算，主要包括：移动刮板链和材料（在非稳定状态）上负载方面的阻力，链移动（考虑到非负载底板移动）在非负载端的阻力。3.1链移动在负载和非负载端在保持材料稳定性的状态下，材料随着刮板链同步前进：。如果，这两个都会达到临界状态。如果，材料与刮板链以不同的速度前进，链速大于材料的速度。暂时，刮板的抵抗力：。空载状