Abstract
The parameters influencing the suction efficiency of peat pneumatic harvesters are listed. Among them are the distance from the nozzle to the underlying surface and the angle of the nozzle. Since there is very little information and recommendations on the rational values of these parameters, it was decided, using a specially designed installation, to conduct a laboratory experiment to assess the air flow velocity, depending on the distance from the nozzle, the angle of the nozzle and the height of the nozzle above the underlying surface of the deposit. The results of the experiment are presented. It is shown, that the rational angle of the nozzle at this stage of research can be considered an angle of 30±5°. In practice, it is impossible to reproduce the zero distance from the nozzle to the underlying surface; therefore, it is recommended to limit the height of 25 mm, which is equal to the maximum size of the conditioned peat crumb. It is noted, that for more accurate results, it is necessary to carry out the following series of experimental works to assess the parameters of suction of peat chips with specific physical and mechanical characteristics.
Highlights
Peat extraction by pneumatic harvesting machines has a number of indisputable advantages over mechanical harvesting
There are no precise data and recommendations on the choice of the nozzle angle, except for the provision that it cannot exceed the angle of internal friction of the rock being mined
As a result of processing a series of experimental data, two groups of curves were obtained, which are the dependences of the air flow velocity vv on the distance from the nozzle x, the angle of the nozzle α and the height h of the nozzle location above the surface of the conveyor belt 0 and 25 mm, shown in Figures 5 and 6
Summary
Peat extraction by pneumatic harvesting machines has a number of indisputable advantages over mechanical harvesting. The intensification of the extraction of milled peat by pneumatic harvesters largely depends on their reliability, the correct choice of settings and the installation of the suction nozzle [3]. It is the angle of the nozzle in combination with the height of its location above the underlying surface, that determines the length and intensity of the suction plume. It was decided to conduct a series of laboratory experimental works, the purpose of which is to determine the speed of the air flow sucked in by the nozzle, depending on the angle of the nozzle and the height of its location above the underlying surface of the deposit
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