Results of experimental investigations on finding the torque change of the safety clutch action
Journal Title: Вісник Тернопільського національного технічного університету - Year 2015, Vol 80, Issue 4
Abstract
Screw conveyors have been widely applied for transporting bulk and lump cargo in various productions processes. However, while transporting jamming of screw operating unit is possible by caused the gap between the screw rotation surface and the inner surface of the pipe guide. To restore the conveyor operation it is necessary to take aside in the axial direction the jammed screw edge from the contact with the cargo, and then after removal of overloading, the drive elements must provide initial position of the operating unit for transporting cargo in the unloading zone. The method of reversing jammed operating unit is conventional, which is performed using the planetary safety devices that provide feedback screw turning from insignificant rotation angle to several complete rotations with the further restoration of the initial position. The method of taking aside the jammed screw along the axis with the help of the ball safety clutch with profile holes is possible as well. Design of the safety clutch, the application of which makes possible to raise the efficiency of the conveyors operation in the extreme conditions, is presented in the article. To prevent jamming of the screw conveyor operating unit while transporting, safety devise with the distributed in time jamming regimes and axial displacement of screw for the automatic recovery of the conveyor operation, has been proposed. To investigate the safety clutch a test bench for finding optimum parameters and regimes of the screw conveyor operation with overloaded operating unit, has been developed. To determine the effect intensity of such factors as inclination angle of the operating unit to the horizon, frequency of the operating unit rotation, time of the resistance moment increase in the torque value on the drive shaft, which occurs while transporting bulk or lump cargo, multifactor experiment has been carried out. According to the results of the calculations carried out taking advantage of the package of applied statistic software for processing and analyses of the experimental investigation results for PC, the dependences of the response surfaces of the optimization parameter and two-dementional cross-section of the response surfaces have been built for visual presentation of results of the carried out investigations. It was found, that the greatest effect on the torque value is that of the operating unit rotation frequency. The next as to the intensity of effect on the torque value is the inclination angle of the operating unit to the horizon. The smallest effect is that of the time of the resistance moment growth.
Authors and Affiliations
Oleksandra Klendii
Keywords
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