Some user is mirrorred, after ball mill installation ends, carry for nothing it is not quite normal to try the sound when moving, stop machine examination discovery, advocate the root ministry of the pinion in transmission gear has flaw. What circumstance is this? SBM expert undertook inspecting an analysis on the spot to this equipment.
At the beginning, maintenance technician thinks production process of the treatment when pinion crackle is medium, the stress that because compare proud quality,be put in the problem and causes centers work up be caused by. But changed a new pinion to throw production to try after adjust through a few skies move, still produced sound of abnormal clench the teeth, ran two months, pinion teeth of a cogwheel ruptured directly.
Spot analysis thinks, of noise of clench the teeth because be clearance of clench the teeth,put too big. Accordingly, undertook adjustment to the clearance of clench the teeth of positive drive. Start again move, as expected vibration and noise are reduced somewhat, but after two months, pinion broke two tooth. Change the 4th new pinion, undertake adjustment to clearance of clench the teeth likewise. Move this 10 days only, pinion teeth of a cogwheel was broken, and pinion opened 3mm to extrapolate.
The expert undertook centralized study to this problem, analyse teeth of a cogwheel break off have two kinds, one kind is bend fatigue breaks off; Another kind is overload breaks off.
The main reason that causes exhaustion to break off has: Of transmission system move load too big; Radius of tine root round horn is too small; Surface roughness of tine root surface has been been worth big; Root of the tine when rolling cut is pulled; There is drawback in material, heat treatment produces tiny flaw etc harmful and leftover stress. Hand in when what tine root is in change when stress exceeded the fatigue limit of material, part of tine root round part produces fatigue crackle, crackle expands ceaselessly again, the bend fatigue that brings about teeth of a cogwheel finally breaks off.
As a result of,overload breaks off is normally short when the concussion load action of serious overload, make stress of susceptive of teeth of a cogwheel exceeds be caused by of its limit stress. Load is serious concentration, dynamic carry on one's shoulder is reached greatly too larger horniness foreign body enters clench the teeth of teeth of a cogwheel to be in, all can cause overload to break off.
But of system of ball mill transmission moving load is not very big commonly, before besides is changing every time, undertook measure and examining to quality of precision of the involute parameter of new gear, gear, surface, detect the result all accords with blueprint technology requirement, accordingly the analysis should be the joint action of exhaustion and overload.
Expert to breaking off circumstance and facility work circumstance undertake an analysis, discover and happen without circumstance of accident serious perhaps overload, also do not have too big concussion load effect, and every time when breakdown happening, clench the teeth of two rounds of teeth of a cogwheel is in, also do not have horniness eyewinker amid. Judge from this, the main reason that breaks tooth should be the load on teeth of a cogwheel is centered badly.
This concludes, after through be opposite two rounds with red lead pink clench the teeth of teeth of a cogwheel is in chromatic examination, the expert got confirming. Although the osculatory area that spot examination discovers tooth flank was achieved 90% , but near cylindrical shell one end chromatic and apparent should weigh a few, and the one end that nears shaft coupling wants apparently light, former 50% what constitute tooth flank only.
And breaking tooth a few times is to stand by cylindrical shell this one aspect of the matter, conclude then, because working load is centered,be, brought about pinion break off for many times.
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