| With the development of smart mining and green energy-saving concept,coal mining machinery has attracted wide attention.Belt conveyor has an irreplaceable role in the whole coal mine conveying system.In the coal mine environment,external factors such as transportation,reloading,or other factors of coal lead to coal dust particles entering the friction interface between the conveyor belt and the drum,causing changes in the friction between the conveyor belt and the drum,which can even cause slippage,affecting its transmission efficiency and increasing energy consumption.To improve its green and energy-saving capability,it is necessary to solve the frictional transmission problem generated by the conveyor belt during operation.As the key point of coal pulverized particles involved in the three-body friction of the coal mine belt conveyor belt friction,the research related to the belt friction as well as its mechanism of action is of great importance.Therefore,the main research contents of this paper are as follows:The rolling contact model and the three-body microcontact model are combined to study the contact problem when the particles are rolling on a rigid half-space viscoelastic layer.The particles are spherical and the radii are distributed along a Gaussian.On this basis,the friction coefficients of particles between surfaces in relative surface motion were derived using the three-body interaction method,and the contact friction characteristics were analyzed for different particle sizes and different loads.In this study,the contact area of the system with particles rolling on the viscoelastic layer to the half-space was calculated.The friction coefficient considering the rolling of the particles was calculated using the three-body interaction method,and the friction coefficient decreases as the particles roll gradually.According to the actual working condition of the mining belt conveyor,the three-body friction mechanics model between the belt conveyor roller and the conveyor belt is constructed based on the three-body friction theory,modern contact theory,viscous-slip friction theory,and Hertzian contact theory,taking into account the influencing factors such as the size of coal powder particles and the roughness between the contact surfaces,and the three-body friction mechanics model between the conveyor belt,the roller,and the coal powder particles.Through the mechanical model analysis,the influence of the size of coal powder particles and the roughness between contact surfaces on the friction force between the conveyor belt and the drum is studied.According to the real working condition environment,the friction process of the third body friction system under coal powder particles is simulated and analyzed,and the three-body friction process is simulated by changing the applied load size,friction speed,and particle size,and the microscopic friction mechanism of coal powder particles on the friction system is investigated by analyzing the friction force between contact surfaces and studying the existing state of coal powder particles.The three-body friction experiment for conveyor belts with different loads,friction speeds,and particle sizes is designed,and the experimental results are analyzed and compared with the calculated and simulated results in the theoretical model and verified against each other.A three-factor,three-level orthogonal test is also designed to derive the magnitude of the effect of the three factors on the friction coefficient.Figure 45 Table 10 Reference 87... |
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