Abstract
The paper discusses geometrical characteristics and strength parameters of fan blades equipped with replaceable active part it end ended to improve the fan adjustability owing to replacement or removal of the active part, which allows the fan to maintain a wide range of ventilation modes.
Highlights
IntroductionThe main ways to control air purity in a mine are dilution and carryover of mining-induced toxic contaminants using main mine fans
The paper discusses geometrical characteristics and strength parameters of fan blades equipped with replaceable active part it end ended to improve the fan adjustability owing to replacement or removal of the active part, which allows the fan to maintain a wide range of ventilation modes
Main mine fans in existence are uneconomic and accident-sensitive; they take too much space to be located on land surface and, among other shortcomings, are poor-adaptable to mine ventilation mode changes whenever required
Summary
The main ways to control air purity in a mine are dilution and carryover of mining-induced toxic contaminants using main mine fans. To make the replacement of impeller blades simpler, for instance, when the blades with other aerodynamic characteristics are required to increase the main mine fan pressure or capacity, the design of the unit of blades has been modified: the base and replaceable part of the unit of blades are fixed using a bolted-type connection (Figure 4). Along with classical approaches, such as material selection and change of cross-sections in strained members of blades, in case of the double, sheet blades, there is an additional option of stress and frequency control by means of numerical modeling of the parameters of connecting straps, stiffening plates, etc. Connecting strap weight, kg Maximal displacements at the tips of blade, mm Maximum stresses in the elements of the blade, MPa
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