外文翻譯---在凍土環(huán)境下工作對鏟運機鏟斗的侵害(編輯修改稿)
2025-02-14 00:01 本頁面
【文章內(nèi)容簡介】 e to work layemthickerthan 15 cm ,because the energy consumption is much greaterfor thinner 1 gives the specific energy consumptions onbreaking frozen ground, obtained by the author for layerthicknesses of 1520 cm。 it also gives the data of experiments byA .N .Zelenin on breaking frozen loam at 5 and 7~ by an impact load, the energy of each impact being 100 kgm,performed under the same conditions [1] .It will be seen that the specific energy consumption on breaking areless for an active scraper bucket than for splitting by a solid wedge (they are less by a factor of 4 for an impact energy A = 100 kgm .and by a factor fo for A = 1000 kgm) .This shows that the use of an active scraperbucket is an efficient way of breaking frozen specific energy consumption on filling the bucket with broken frozen rock was determined after determining the pattern of change in forces along the path of filling of the bucket with rock ,lf .This dependence isplotted graphically in Fig .2. It will be seen that the bucket filling forces increased with the layer thickness by a parabolic law. Furthermore ,these curves give the bucket filling coefficients, Kf ,obtained by these equations for determining the specific energy consumption on filling the bucket ,Ef, and on moving the scraper like a vehicle, Em ,may be written in the general form where Kl is the coefficient of loosening of the rock ,and q is the volume of rock in the into Eq. (5) the bucket filling forces pf (Fig .2) and the mean value of the tractive effect required to displace the scraper along the filling path ,Pd (this was 9201070 kg in our experiments) ,we get the values of Ef and gd for various different breaking conditions (Fig .3).When h 10 cm ,only negligible filling of the bucket with broken frozenrock was observed .It will be seen from the curves that the specific energy consumption of filling hardly decreases at all with the thickness of the layer beingbroken。 however, one cannot infer from this that it is more advantageous to fillthe bucket by working a thinner layer, because a decrease in h is acpaniedsimultaneously not only by a decrease in the filling forces but also by a decreasein the filling coefficient Kf (Fig. 2) ,and the bucket is only partly filled. Thespecific energy consumption on filling the bucket is somewhat higher for gravelthan for loam。 this is also due to the lower values of Kf for gravelly parison of the specific energy consumptions on filling the bucketwith frozen rock and on displacement of the scraper with the analogous indicesfor unfrozen rock ,obtained by Artem39。ev [2] ,reveals that they are virtually the same and
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