Loesche Vertical roller mill hydraulic cylinder and linkage analysis of the thread breakage and repair

Loesche vertical roller mill working principle hydraulic cylinder connecting structure consists of: roller, roller shaft axis, rocker, disc, rod head, piston, hydraulic cylinders, hydraulic cylinder base components. Loesche mill during grinding material, the material of the pressure roller rolling force from the tension produced by the hydraulic cylinder piston and connecting rod head acting on the rocker arm, the entire arm as a lever in the central axis of the fulcrum, The tension is transmitted to the cylinder roller. Coupled piston and connecting rod head of hydraulic cylinder jacket by two semicircles achieved. Two semicircles connected by a bolt into a cylindrical outer sleeve, the inner tube is threaded, and the outer surface of the piston rod has an external thread. Stress Loesche vertical roller mill at run time under the influence of the material frequently move up and down, so the piston rod and rod head at the long-term mutation stress, generated tends to be concentrated in the thread, long-term effects of fatigue occurs fracture. A factory LM35.4 type Loesche Vertical roller mill in operation five years, there was a rupture which occurred in the hydraulic cylinder piston and connecting rod connecting thread at the head of the two grinding rollers. Piston and connecting rod must be replaced first.