Abstract
The article presents methods for determining loads on rollers of a six-roll support of a tubular belt conveyor, based on the equilibrium laws of elastic cylindrical plates and shells filled with a freight. In this case, the forces acting on the rollers of the tubular conveyor are the sum of the forces caused by the weight and expansion of the bulk load, the weight and bend of the belt, as well as the inertial forces associated with the curvature and the deflection of the belt under the weight of the bulk load. The dynamic forces acting on the rollers as the belt moves are determined from the equation of the oscillations of a heavy flexible string using the Ritz method. As a result of the research, analytical dependences of the forces acting on the rollers of the six-roller support of the tubular conveyor on the parameters of the conveyor, the belt, the properties of the bulk load and the radius of curvature of the conveyor are obtained, and an assessment of the component these forces is given. The results can be used to determine the parameters of the tubular conveyors rollers and increase the service life of the rollers.
Highlights
With the increasing demands for environmental protection, tubular belt conveyors are widely used in the transportation of environmentally hazardous bulk loads.The main advantages of tubular belt conveyors, as compared to belt conveyors with a grooved belt, are the absence of contact with the environment, as well as the ability to transport bulk load along curved paths without overload devised.The operating experience of the tubular belt conveyors showed that, unlike the belt conveyor with a grooved belt, the rollers of the tubular conveyor are affected by additional forces due to the load spread and the inertia forces associated with the framework curvature and bend of the belt from the weight of the load
In this paper, based on the equilibrium equations of a cylindrical elastic shell filled with a bulk load, the forces acting on the rollers of a six-roll support of a tubular conveyor are determined by the weight and spread of the bulk load, the weight and bend of the belt in its cross section, and by the inertial forces due to curvature traces and belt deflection arising under the action of gravity of the transported load
Where P i is force acting on the i-th roller supports roller of the curvilinear section of the tubular conveyor, N; P Ldi is force acting on the i-th roller supports roller, curvilinear section of the tubular conveyor from the weight and spreading bulk load, N; P bi is force acting on the i-th roller supports roller, curvilinear section of the tubular conveyor of the weight of the belt (Fig. 1), N; P bni is force acting on the i-th roller supports roller, curvilinear section of the tubular conveyor from the bending of the belt, N; and Pt is force acting on the roller support rollers, curvilinear section of the tubular conveyor from the belt tension, N
Summary
With the increasing demands for environmental protection, tubular belt conveyors are widely used in the transportation of environmentally hazardous bulk loads.The main advantages of tubular belt conveyors, as compared to belt conveyors with a grooved belt, are the absence of contact with the environment, as well as the ability to transport bulk load along curved paths without overload devised.The operating experience of the tubular belt conveyors showed that, unlike the belt conveyor with a grooved belt, the rollers of the tubular conveyor are affected by additional forces due to the load spread and the inertia forces associated with the framework curvature and bend of the belt from the weight of the load. In these studies, the obtained values of the loads on the rollers do not quite correspond to the real loads In these works, the dependences of the forces acting on the rollers of tubular conveyors on the parameters of the conveyor, the belt and the properties of the transported load are not investigated
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