Parse looking for new large-scale multi-pole rotor crusher maintenance

Analysis of the problem should first consider the possibility of rotor balancing, balancing a problem if the inertial force generated by the spindle bearings are very

destructive. But when you have replaced the hammer rotor, the rotor static balance well after the operation did not produce large vibration, rotor running soon,

Bearing fever more serious (test temperature exceeds 90 ℃). Bearing lubricant used is molybdenum disulfide grease lubrication amount in full compliance with the requirements.

All of the above possible causes are ruled out, probably due to bearing selection and assembly size mismatch caused.  mining screen

Analysis of the problem due to double rotor crusher two rotor speed higher than the general level P0 22332 bearing speed limit and withstand heavy impact loads, bearing

frictional heating operation, the temperature is higher than the journal bearing inner and outer ring temperature above bearing, bearing operating

Radial clearance decreases friction and heat intensified, bearing temperature rose sharply, molybdenum disulfide grease to melt outflow, eventually leading to bearing failure.

Measuring existing bearing bore size Φ340-0.01-0.046, standard P0 grade 22332 bearing diameter size Φ340-0.036, this tolerance with a maximum amount of interference is 0 - (-

0.046) = 0.046mm, the maximum gap to-0.01-(-0.036) = 0.026mm, when the bearing

Differential temperature difference t = 60 ℃ (bearing operating temperature up to 80 ℃), the coefficient of thermal expansion of the bearing material α = 11.2 × 10-6 / ℃,

the amount of expansion bearing outer ring outer = Φ × α × t difference = 340 × 11.2 × 10-6 × 60 = 0.228, the thermal expansion of the bearing inner ring inside = Φ ×

α × t difference = 160

× 11.2 × 10-6 × 60 = 0.108. Since the bearing seat is made of cast steel parts processing, thickness weight, better thermal conditions in the bearing, which is far less than   vibrating screen design

the amount of thermal expansion deformation of the bearing inner and outer rings of thin thermal expansion. Bearing outer ring of the bearing hole size by size limitations, and

bearing inner heat

Swell, causing the roller bearing radial clearance is reduced, roller bearing inner and outer rings with film thinning, increased wear and tear, the rotor speed is over P0 level

22332 bearing speed limit, which requires a greater radial rotor bearing clearance, this contradicts with the working conditions, resulting in

Rotor bearings running soon, bearing temperature increased sharply, the loss of molybdenum disulfide grease to melt, causing the bearing raceway bearing failure caused by burns.

Improvements directly related to the rotor bearing temperature changes due to double rotor impact crusher withstand heavy shock load cycle, the rotor bearing temperature change

is directly related to the normal operation of the whole equipment should be used in a large radial clearance of the bearing, while bearing bore Boring dimensions examinations

Regard to the normal operating temperature of the bearing caused by changes in amount of thermal expansion, to prevent the bearing temperature rise sharply.

Bearings used model 22332/C3, bearing tolerances boring should Φ340G7 (+0.075 +0.018). Such tolerances can guarantee a high operating temperature conditions, the bearing radial

clearance appropriate to ensure the roller bearing oil film thickness, to prevent the roller surface

Damage caused by bearing failure.

When the rotor running for some time, the working temperature rises caused by axial thermal stretch, requiring non-drive end bearing and rotor bearing outer cap should be left

between 1mm gap to prevent axial thermal expansion causes the bearing radial clearance is too small .

Ensure static and dynamic balance 2PF1010 rotor rotor mass, high speed, if the rotor imbalance occurs, there may be great vibration, resulting bearing load increases, increased

wear and tear. Therefore, the rotor balancing equipment operation is one of the most important conditions. In the production process,

Impact rotor balancing performance is a major factor board hammer, during assembly, the same weight should be mounted on the rotor plate hammer symmetrical position, the

installation is complete, turn the rotor, the rotor static balance observe whether requirements.