Abstract
In this paper, the authors consider dynamics of partitioned vibratory feeders with rubber elastic couplings. Use of vibratory feeders (including partitioned ones) and schemes for the ore vibrating drawing, feeding and loading in underground conditions allowed to mechanize one of the most time-consuming and dangerous processes of uranium ore mining and to solve the following problems: to improve effectiveness of the lumpy rock mass drawing and loading by 2.5-3 times; to increase intensity of mining operations and reduce life of the excavation blocks and horizons; to reduce labor intensity and cut cost of the process of ore drawing and loading; to improve uniformity of the rock-mass outflowing from the discharge opening and to reduce by 3-5 times frequency of the large-lump material freezing (use of partitioned feeders reduces number of freezes by 25-60 times); to increase size of commercial lump panels; practically to exclude traumas during the process of ore drawing and loading (usually, it presents 30-60 % of all traumas caused by the underground operations); to mechanize process of ore drawing and loading, and to create conditions for implementation of low-waste cyclic-and-continuous mining technology.
Highlights
Rate of the world economy growth is inextricably associated with development of energy industry
The authors’ scientific studies and their experience in designing and commissioning heavy vibratory-type machines show that the problem of highly effective and safety ore drawing and loading from the extraction blocks can be successfully solved by using vibratory feeders and complexes, which intensively effect the drawn material, reduce energy consumption and number of material freezes and ensure intensification and concentration of mining operations
They are simple: drive section is made on the basis of a well-known feeder and is equipped with a platform buried under a straight column of broken rock mass, which periodically receives oscillatory energy from the drive section under condition that it is released from the mass of the drawn material
Summary
Rate of the world economy growth is inextricably associated with development of energy industry. One of the most important technological processes in ore-deposit underground mining is drawing of broken rock from the working excavation zone and loading it into transport facilities This process’s share in total labor costs is up to 60 % and is associated with high level of injury of miners (up to 30-60 % of total underground mining operations). The authors’ scientific studies and their experience in designing and commissioning heavy vibratory-type machines show that the problem of highly effective and safety ore drawing and loading from the extraction blocks can be successfully solved by using vibratory feeders and complexes, which intensively effect the drawn material, reduce energy consumption and number of material freezes and ensure intensification and concentration of mining operations. Objective of the work: to develop method for calculating dynamic characteristics of partitioned vibratory feeders and to determine dependence of intrinsic vibration frequencies on the stiffness of elastic couplings in the drive element and drive section, length of platform and ratio of vibrating rock mass in the section
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