Lysytsia M.I. On the oscillations of spatial vibration-isolating system of mining machines under the action of impact loads

Details

Parent Category: Geo-Technical Mechanics, 2020

Category: Geo-Technical Mechanics, 2020, Issue 151

Geoteh. meh. 2020, 151, 112-120

  DOI: https://doi.org/10.1051/e3sconf/201910900052

On the oscillations of spatial vibration-isolating system of mining machines under the action of impact loads

¹Lysytsia M.I.

¹Institute of Geotechnical Mechanics named by N. Poljakov of NAS of Ukraine

UDC 678.4.06:621.81

Language: English

Abstract.

The main factor holding back the introduction of belt conveyors for transporting bulk cargo is the low life of the belt and rollers, caused by significant dynamic forces at the loading points. In the interaction of pieces of cargo with an elastically mounted roller support, the impact process consists of two phases: the collision, which is considered as the impact of free bodies, and the subsequent movement of the supporting structures at a certain initial speed. After impact, the load roller oscillate about the equilibrium position. When the next piece of cargo falls due to the oscillation of the roller support, the relative speed of interaction of the bodies (load - roller support) may increase or decrease compared with the case of the initial impact. To reduce the load on the belt and the rollers necessary to the settling time of the suspension system was less than the period of passage of large pieces.

The paper considers the influence of the type of loading sections of the belt conveyor on the nature of the movement of the roller bearings after interacting with bulk cargo. The oscillations of two main types of loading sections are studied - with load-bearing ropes and compliant roller bearings of the design of IGTM of NAS of Ukraine.

A distinctive feature of the IGTM compliant roller bearings is special bearing rollers, which are pivotally attached at one end to the side posts and the other to ropes stretched along the conveyor section. Standard clips are embedded in the frames. In the middle between the side rollers on the ropes, frames for the middle rollers are attached. The tension of the ropes is carried out by a screw device.

A mechanism has been established to reduce the amplitude of the oscillations of the rollers of the loading section as compared with the initial displacement after the impact, which consists in the fact that at the first moment of time, under the influence of the falling load, the deflection is localized over the small length of the section, and subsequently the energy accumulated by this section is spent on fluctuations along the length of the entire section.

The rational parameters of the loading section (length, rope tension, stiffness, distance between the rollers) are determined, at which the amplitude of the vertical vibrations of the roller decreases 6-8 times in a time of 0.4-0.5 s.

Keywords:

loading section, impact, bulk cargo, belt conveyor

References:

1.   Aramanovich, I.G. and Levin, V.I. (1969), Uravneniya matematicheskoy fiziki [Equations of mathematical physics], Nauka, Moscow, USSR.

2.   Timoshenko, S.P. (1946), Soprotivleniye materialov [Strength of materials], Gostekhizdat, Moscow, USSR.

About the authors:

Lysytsia Mykola Ivanovych, Candidate of Technical Sciences (Ph. D.), Senior Researcher, Senior Researcher in Department of Elastomeric Component Mechanics in Mining Machines, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Science of Ukraine, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

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