On the issue of selecting the power and type of the main drive of electric multi-bucket dredges
Abstract
Determining the power of the main drive of multi-bucket electric dredges, i.e., the drive of their bucket device, encounters the following difficulties. 1. Insufficient study of the physical properties of the soils of dredged placers leads to the fact that the cutting force of the soils by the buckets cannot be determined with the necessary degree of accuracy. The soils are, for the most part, not homogeneous. As follows from the classification of soils for dredging operations (Table 1), established in 1937, soils may contain peat, sand, clay, crushed stone, sandstone, boulders, igneous rocks and other components, and their percentage composition varies widely. Therefore, using physical constants obtained from testing homogeneous soils for such soils would not be entirely correct. 2. During dredge operation, various obstacles may be encountered (large boulders, support timber from old workings, etc.), which cause overloads of the bucket drive motor. The duration and magnitude of overloads cannot be accounted for theoretically. Identifying the nature of such overloads and the magnitude of the cutting force can be accomplished using load diagrams recorded by self‑recording electrical measuring instruments. The selection of the type of drive for the bucket device presents fewer difficulties.
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References
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