The Invalidation Cause Analysis of Ball mill Gear

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June 14, 2014 at 5:32 am #46808

grinding mills are in cement, metallurgy, mines, power plants and other industries important grinding equipment.Its efficiency has important influence on the normal work of theball mills.But in the working process of the mill,it Can easily be seen in the gear failure is a failure,This article mainly for the analysis of gear transmission failure reason.The failure forms of gear is the following several ways:Transition wear,Abrasive wear,Pitting corrosion and broken tooth form.The causes of gear transmission failure has the following :

1) work environment and lubrication conditions

Due to working conditions, ball mills gears transmission with poor workingconditions, dust particles in the air is more and poor sealing condition.Lubrication uses artificial lubrication on a regular basis, so the gear pair prone to these problems,Insufficient filling, the poor of condition gear pair , vulnerable to dry friction effect caused by the transition metal surface wear.

2) the contact ratio

Gears in the transmission of single tooth load time would increase greatly, it is an important to cause fast of gear wear.Reduce inevitably cause the gear clearance and contact ratio increased,Such impurities and dust floats in the air, it is easier to enter between the gear pair meshing surface, it cause the occurrence of abrasive wear.

3) the gear surface contact fatigue strength

The existence of stress concentration on the gears,When the gear goes into the meshing state,In the role of excessive equivalent contact shear stress, surface layer to form the original cracks.In the process of running gear, the contact pressure of high pressure oil wave goes into the crack at high speed,a powerful fluid impacts on wall crack;At the same time, the gear surface crack mouth closed, it can be further raise crack within the oil pressure,and forced the crack to expand further direction and the direction of the tooth surface, material fall off from the tooth surface, the formation of pitting corrosion.

4) the tooth root bending fatigue strength

The gear runs after a period of time,Small gear axis and the axis of the ball mill roller may become not parallel,When the gear mesh as local contact,Gear uneven stress on the tooth width, gear shaft bending and torsion deformation easilySo that the uneven load distribution along tooth width direction;On the other hand, due to uneven material organization,There are Slag inclusion, porosity and hard particles, surface or subsurface of local shear stress is too large, it can produce broken teeth phenomenon.

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