The Research Between Flywheel Effect Of The Heavy Drum In The Coal Mining Machine And Some Component And Assembly Units

When the diameter of the drum and the cutting depth is invariable, heavy drum means be magnified the thickNess of dished end and spiral roll, be increased the structural size of the picks and tooth holders. That can enhance the intensity of drum and limitation of the abrasion. When the structural size is magnified, the rotational inertia of drum is also increase just like the flywheel effect. It can keep the capacity, steady the rolling speed, boost the effect of coal and balance the load. Mass of the drum will boost too because of enhancing several sizes. Then it will cause the load and the twisting moment of the key sections changed, such as sun gear, roll bearings and so on. Making use of the amzing limited long bridge model which is placed on the entire flexible foundation, it receives the gear bending stress on the transition curve. When gears are meshing, the stress is nonuniform on the line of contact. The distribution on the curve normal stress of transition fillet is approach triple cosine curve.this is the accord of the reaserch on contact fatique strength and the flexural fatique strength. It obtains the deformation and stiffness of the bearing relationship between the stress and displacement by the methods of calculus according to the elliptical point contact theory of Hertz. After checked and analyzed the transformation of these key sections, it comes to a conclusion. It is found that the key section has not influence or little influence when the drums amplify the suited size. The flywheel effect can be attained. So this article has the prodigious and realistic significance.