• Valerii N. Belovodskii
• Sergei L. Bukin

УДК 621.01/.03 DOI: 10.21440/0536-1028-2019-4-114-123

Belovodskii V. N., Bukin S. L. Polyharmonic opportunities of vibrating machines with cardan joint in inertial drive transmission. Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal = News of the Higher Institutions. Mining Journal. 2019; 4: 114–123 (In Russ.). DOI: 10.21440/0536- 1028-2019-4-114-123

Introduction. A number of studies have found that polyharmonic oscillations excited in the working bodies of vibrating machines can significantly intensify various technological processes. It is revealed that the more saturated the frequency spectrum of oscillations, the higher is the probability of occurrence of resonant movements of particles of the medium being processed.
Research aim is to study the nature of oscillations of the working body of a single-mass vibrator with Hooke’s joint in the transmission of an unbalanced vibration exciter, as well as to get an idea of the polyharmonic capabilities of such machines. Methodology includes the representation of vibrating machine working body motion mathematical model in the form the second order linear differential equation. A feature of the oscillating system is the effect on it of the exciting force of the centrifugal vibration exciter, which is driven by an electric motor through a cardan shaft. The solution of the problem was carried out by a numerical method with an original determination of the "almost-period" and the following frequency content of the oscillations of the working body.
Results. The non-periodic nature of oscillations is revealed, the method of investigating their frequency content based on the "almost-period" determination as the moment of phase trajectory "closure" is proposed and tested. According to the results of the study, the oscillation features of the vibrating machines with an inertial drive were revealed, their advantages and disadvantages were noted.
Conclusions. In the spectrum of the oscillation of the working body of the vibrating machine, harmonic components with close frequencies are dominant. To the considered scheme positive features, the global stability of the formed polyharmonic motion modes can be attributed.

Key words: vibrating machine; vibration exciter; Hooke’s joint; frequency content; "almost periodic"; polyharmonic.

БИБЛИОГРАФИЧЕСКИЙ СПИСОК

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• Таугер Виталий Михайлович
• Aleksandr A. Leontiev

УДК 622 23.05 DOI: 10.21440/0536-1028-2019-4-106-113

Tauger V. M., Leontiev A. A. The calculation of heat exchange processes in the conveying pipe of a skip pneumatic winder. Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal = News of the Higher Institutions. Mining Journal. 2019; 4: 106–113. DOI: 10.21440/0536-1028-2019-4-106-113

Introduction. The article considers thermodynamic processes in the conveying pipe of a skip pneumatic winder. Research aim is to analyse the establishment of temperature regime of pipeline’s operation and estimate the infl uence of air refrigeration on the velocity of a skip in the conveying pipe of a skip pneumatic winder.
Methodology. A mathematical model has been built of “mining blower–skip–lifting pipeline–surrounding media” system, which will make it possible to get the dependence of conveying medium temperature and loaded skip velocity on depth. The formulae are introduced to estimate pipeline wall heating and air refrigeration inside the pipeline. The ratio has been found, which makes it possible to determine the time of heating upon the expiry of which the process of heat exchange in the initial part of the pipe will be steady.
Results. The relevance of the problems has been justifi ed. Dependences of air-fl ow rate and air velocity in the pipeline on the vertical height coordinate are presented together with skip winding velocity variation conditioned by air fl ow refrigeration. The solution to the inverse problem is described: the calculation of air blowing station capacity required to provide the calculated value of average velocity, the results of which will allow to determine the value of mining blower capacity which provides for skip calculated average winding velocity, predetermined cycle duration, and unit capacity.
Summary. The ratios, obtained as a result of the calculation, make it possible to determine the value of mining blower capacity required to provide for skip calculated average winding velocity, predetermined cycle duration, and unit capacity.

Key words: winder; skip; pneumatic system; pipeline; heat exchange processes; mathematical model; mine winding.

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