The Research On Start-up Problem And No Resonance Design Of Heavy Scraper Conveyor

At present,most light and medium-sized scraper conveyor often uses head and tail simultaneous start-up. For heavy-duty scraper conveyor;the scraper chain of cargo and elastic deformation are great, if the head start at the same time, it is bound to cause tail motor power unbalance and the tension of scraper chain becomes large. Starting with head and tail motor sequence, can solve the motor power good imbalance problem, this strategy has been used in some units. However, how to determine the starting order and the time difference, at present not much theoretical research on this problem.In this paper, using the finite element method, considering the viscoelastic properties of the scraper chain establishing dynamics finite element model of the scraper conveyor and its equation using nonlinear simulation, the simulation program conveyor starting software MATLAB language; by controlling the head and tail motor rotational speed, the heavy-duty scraper conveyor system for the various simulation, comparative analysis the way of starting, the output power balance scraper chain tension and the ends of motor, the sequence starting can effectively reduce the output power of the scraper chain the maximum tension and balance tail motor conclusions and data.The scraper conveyor is through meshing the chain wheel and the chain to realize driving chain wheel, when the uniform rotation, chain speed varies periodically, leading to generate dynamic loading conveyor. The dynamic load is conveyor vibration source, how to avoid the resonance is paid more and more attention, therefore, becomes a hot topic no resonance design of scraper conveyor.Based on the analysis of scraper conveyor drive motion characteristics of the system, and then to determine the vibration frequency vibration to the system; through modal analysis theory, the system is in a natural frequency of four cases. Finally, through the close degree of contrast analysis of vibration frequency and natural frequency, can foresee whether conveyor resonance phenomenon, in some conditions if, by adjusting some parameters, in order to avoid the resonance of the objective; illustrates the convenience and the correctness of the theory.The completion of this project will provide heavy-duty scraper conveyor, provide the starting strategy most simple optimization, and provide a theoretical basis for the head and tail sequence starting; for heavy-duty scraper conveyor no resonance design provides a theoretical basis.