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The subject of this case study is the NDE (nondrive end) Pinion Bearing of Ball Mill No 8 in the Mill Dpt. in the flotation plant. The bearings on the pinion are of type 22380YMB. SPM HD Spectrum from the NDE bearing shows a clear match of the BPFO (Ball Pass Frequency Outer Race) symptom. According to the customer, following the indications ...
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The production process culminates in two ball mills. Each day, the 15meterlong machines grind up to 5000 metric tons of clinker the result is readytouse Portland cement. In each mill, two pinions and gear units transfer the force from two 2250kilowatt asynchronous motors to a girth gear that is directly connected to the ball mill surface.
Ball mill 9000 HP Motor speed 990 rpm Mill speed 14 rpm R/L ill diameter 5 m Mill bearing 22 m Project A Twopinion girth gear drive Fig. 2A 1 Annulus, 2 pinions 2 Reducing gears, each 2stage 2 Main motors 2 Turning gears Project B Central drive Fig. 2B 1 Double planetary gear 1 Main motor 1 Turning gear
13 Jun 16 11:36 I have been out of the vibration field for awhile due to illness but had a request to give an opinion A vibration survey was carried on this Ball Mill with a duel pinion drive. The vibration is high in all planes on both sides of the Mill or both pinion drives.
In such cases, a piezoelectric accelerometer or a seismic velocimeter is used to measure the severity of the bearing vibrations. Shaft and bearing vibration monitoring is specified in ISO7919 and ISO10816 respectively and is applicable to all rotating machines, such as hydro turbines, gas turbines, steam turbines, pumps, fans, cooling towers ...
The installation method and sequence for all types of ball mills are roughly the same. To ensure smooth operation of the ball mill and to reduce the risk to the building, the ball mill must be installed on a reinforced concrete foundation of to 3 times of its weight. The foundation should be laid on solid soil and should be at least 4050 ...
The ball mill pinion gear is subjected to more force than the large gear of the ball mill, and its wear rate is also higher than that of the large gear, making it a vulnerable part of the ball structural strength of the ball mill pinion is relatively high, and it is often paired with a quenched and tempered ball mill pinion and a normalized large gear, so that the tooth surface ...
DO NOT USE WHITE LEAD OR GREASE. The mill should rotate in the proper direction. The mill gear should be lifted by the pinion causing a downward pressure on the pinion shaft bearing. Mills are made either right or left "hand". There are two methods of identifying the "hand" of the mill.
In the daily production of the ball mill, there will always be some sudden failures, such as severe vibration of the ball mill gear, cracking of the large gear ring of the ball mill, or the sudden increase in the temperature of the ball mill bearing. engineers shares the reasons and solutions of the severe vibration of the ball mill pinion.
vibration. A small relative motion between balls and raceway occurs in nonrotating ball bearings that are subject to external vibration. When the bearing isn't turning, an oil film cannot be formed to prevent ~rina~ ~mks raceway wear. Wear debris oxidizes and accelerates the wear process. Correct by isolating bearings from external vibration, and
Add small amount of new grease to pinion bearing, if grease lubricated. Replace bearing grease. Replace trunnion bearing oil, flush and clean. 43 Tel: (+27) 11 454 4177. Fax: (+27)11 454 4178. projects EL BROCAL. Mill Installation Manual 16x22ft, 2800kW Ball Mill. 1. TROUBLE SHOOTING GEAR AND PINION VIBRATION Excessive ...
Excessive vibration and heat around the ball mill pinion area are red flags that a pinion bearing may be failing. Vibrations can arise due to irregular movements caused by the compromised bearing. Similarly, increased heat generation in the bearing housing may indicate excessive friction and inadequate lubrication.
After the ball mill works for a long time, the anchor bolts of the motor, reducer and pinion bearing seat in the transmission part will sometimes loosen, and the transmission part will move, so that the axis is not in the same straight line, and vibration occurs.
Wornout pinion bearing results in noticeable vibration or differential noise on acceleration. Gear grinding: Gear grinding or humming noise is another symptom that reveals a bad pinion bearing. The gear grinding is produced in the process of acceleration of the vehicle. Tire damage: Tire damage is also one of the bad front pinionbearing symptoms.
Ball mills play an important role in both energy consumption and metal wear in mineral processing plants. To maintain high operating efficiency, the material transportation inside the tumbling body has to be monitored in time. It is known that the vibration signal pattern varies corresponding to the operating state of the mill. Besides the basic vibration signature from the rotary drum and ...
The typical IGC pinion shaft arrangement, having the impellers outboard of the seals and bearings, allows access for the application of VIGV mechanisms at the inlet of each stage (Fig. A ), if desired, and similar accessibility exists for VDVs ( Fig. B) with similar actuation mechanisms.
The pinion gear rotates at driveshaft speed and can mimic a driveshaft speedrelated vibration. Improper pinion bearing preload can cause what appears to be a pinion seal leak, but the seal is fine, the pinion gear is moving vertically, horizontally, or diagonally as is rotates. No seal can hold on oil under those conditions.
The common causes of vibrations of the ball mill are described in short. The exciting frequencies at which the possible causes of vibration can be recognised are estimated for all principle parts of the ball mill. After that the measurement of accelerations of vibration at housings of bearings has been performed.
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