Study On Bionic Tribology Design And Performance Analysis Of Driving Drum

Belt conveyor is the major transportation equipment in coalmine production, and driving drum is it's key component. The belt conveyor driven by friction completes mechanical transmission, which adopts the friction principle. In order to ensure the safe operation of belt conveyor and improve its transportation efficiency, it is necessary to increase the driving force of the driving drum.In this paper, the research target is to improve the transportation capacity of the belt conveyor, and the aim is to increase friction driving force and realize the function of increasing friction and antiskid through the research on the surface structure of driving drum's covering-layer.By the analysis of the principle of belt conveyor friction transmission, the methods of improving driving force are obtained in this paper, feasibility and application of the methods are demonstrated. The friction-increasing bionic driving drum is designed by using bionic tribology. Considering centrifugal force and gravity the equation is established. Based on the slip analysis, theoretical correction of antiskid conditions and technical measures to antiskid are researched.Based on bionic non-smooth theory, in accordance of the bionics tribology theory, two kinds of surface structures of bionic non-smooth driving drum's covering-layer are designed from the point of increasing friction traction, which are the convexity and concave structure. Mathematical modeling is done according to the design of two surface structures of bionic non-smooth driving drum's covering-layer. Meanwhile, the established mathematical modeling is simulated. Through correcting classical friction law, the influencing factor of frictional coefficient between the belt and bionic driving drum is analyzed in accordance to the contact characteristics between driving drum and belt, and function expression of friction coefficient is set up on this basis. Besides, the paper analyzes the mechanism of increasing friction for non-smooth bionic driving drum with convexity structure covering-layer according to its stress characteristics and material properties of covering-layer. Then, through integrating into vacuum adsorption principle and analyzing the force of single concave, the mechanical model of non-smooth bionic driving drum with concave covering-layer is established under the working conditions. Depending on these, the friction-increasing mechanism of non-smooth bionic driving drum with concave structure covering-layer is studied, in this way, the function expression of friction coefficient is got.As the material of covering-layer is rubber, the advantages and disadvantages of rubber's constitutive model and its application occasions based on different theories are analyzed, and through analysis, the two constitutive models of bionic non-smooth driving drum's rubber covered-layer are both determined to chosen Mooney-Rivlin model. By using finite element analysis, the stress and deformation of bionic non-smooth driving drum (convexity and concave structure) which have geometric nonlinearity (large deformation) and material nonlinearity are studied, and the results are compared with common driving drum.In this paper, through field experiments which adopts orthogonal polynomial regression design, the influence of the density, height, and diameter of non-smooth driving drum covering-layer's surface unit body on friction coefficient is researched, and the regression equation between non-smooth geometric parameters of covering-layer's structure and friction coefficient is obtained. Through optimization analysis of equation regression, the optimal value is got. Finally, experimental verification and simulation both show that the two types of bionic non-smooth driving drum can increase the driving force and improve the transportation capacity of belt conveyor. The friction coefficient between driving drum and belt is about 0.25, while the friction coefficient between bionic driving drum and belt is over 0.32. But as experiment time increases, the effect of increasing friction for driving drum with concave covering-layer is decreased, and much lower than the driving drum with convexity covering-layer.