| Abstract: | Conclusions
| 1. |
It is proposed that the energy content of dynamic scoops be evaluated on the basis of the quantity of relative power —the
ratio of the total power of the drive of the percussive teeth to the capacity of the scoop es. It is also proposed that the ratio es/zf be used as an index of the efficiency of such scoops. Here, zf is the require degree of fragmentation of the rock. Based on this criterion, a scoop with a capacity of 12 m3 is found to have the best energy characteristics.
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| 2. |
The proposed design method makes it possible to predict the energy content of the process of excavating rock by means of excavators
equipped with a dynamic scoop.
|
| 3. |
Given the current level of development of pneumatic hammers, from the standpoint of total unit energy expenditures the excavation
of rock by excavators and mechanical shovels with dynamic scoops is expedient for rocks having a strength of 70–85 MPa and
classified as II or III with respect to block structure.
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Mining Institute, Siberian Branch of the Russian Academy of Sciences, Novosibirsk. Translated from Fiziko-Tekhnicheskie Problemy
Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 66–72, May–June, 1998. |
