The processing of rotary kiln big ring gear vibration - 2020
09 -
29 and British people horsepower ChanShaoRen wei-hua song {sang pu} lei (
Anyang China united cement co. , LTD. )
The problems existing in the company of 5000 t/d NSP cement clinker production line, rotary kiln production during the 3 years, relatively stable operation, three years later found that when stop kiln to open again after cold kiln, the big gear ring vibration is larger, pinion bearing level outward shaking badly;
With the extension of kiln operation time, the big gear ring vibration weakened, small gear housing, shaking, basic operation after 3 ~ 5 d vibration disappeared, kiln running.
After each open kiln in this kind of phenomenon, and the vibration each time.
Table 1 for some parameters of rotary kiln.
Table 1 part parameters of rotary kiln 2 after cause analysis problem, check the big gear ring interface bolts, big gear ring spring board connected to the kiln shell are normal, roller and belting leather surface not potholes;
3 file 2 radius of roller wear 9 mm, other roller wear is less;
From found pinion gear cover observation hole, and a large ring gear tooth back were the bright side of contact.
According to the situation to the examination and the big ring gear and small gear bearing vibration level to the fault characteristics of rock, the analysis says the problem is the direct cause of the big ring gear and small gear tooth tip clearance size, 3 gear roller wear is the root cause.
According to understand, 1, 2, 3 gear design on the stress is (
Stress)
Consistent, wear in theory should be consistent;
Pressure lead and observation through roller bearing shell temperature, 1, 2, 3 gear roller bearing is normal, belting leather slip and dynamic measurement of 3 to 6 mm/r;
And analysis, 3 gear wheel is lower than 1, 2 gear roller hardness and cause its wear is larger.
After 3 gear wheel wear three simplified and near the center of the integrity of the three big gear ring down, stop kiln to further reduce the cold big gear ring center, just open the kiln kiln simplified axial bending.
The above three reasons tip clearance is reduced, so just open a kiln, big ring gear vibration is larger;
As the extension of kiln operation time, kiln to hot big gear ring center with the third barrel rises, kiln cylinder axial bending is reduced, which makes the tip clearance increases, big ring gear vibration weakened until the normal.
Three measures the tip clearance decreased the direct cause of the problem, measures have the following three: (
1)
Replace band 3 2 wheel or padded under the wheel.
Kiln must be 3 file jacking, replace the roller cost 1 million yuan, padded under the wheel to the center line of the rotary kiln measurement, cost is higher also.
(
2)
1, 2, 3, all gear wheel into the inlet.
Need for the kiln is running, not taken from hot roller, risk is bigger.
(
3)
Gear moving outward.
The fixed roller, risks and costs is small.
According to the actual situation, decided to drive the move outward processing measures.
Open part of the gear cover, on both ends of the tip clearance is 4, respectively.
7 and 5 mm.
7毫米;
Loosen the pinion bearing retaining bolt, pinion bearing suddenly move outward and its top wire top off, move up to 50 mm.
From table 1 shows, 40, the module of gear tooth tip clearance requirement is 14, by adjusting the pinion bearing will eventually tip clearance and gear side clearance adjustment to: 14 at one end.
1 mm and 0.
8 mm, the other end of the 13.
7 mm and 0.
8 mm, pinion bearing the actual moving outward 30 mm;
Then based on pinion adjust other transmission.
Transmission device, with red lead powder inspection pinion and ring gear meshing, tooth contact long 70%, 50% high tooth contact, meet the requirements.
After the above processing, big ring gear vibration when just open kiln greatly abate, essentially normal;
Although kiln body have a slight vibration, analysis considered just open kiln cylinder axial bending, then kiln working properly.
Big gear ring vibration problem to deal with, wait for the conditional deal with 3 gear wheel wear problem.
