mills. The World's largest gear driven mill (manufactured at CITIC HIC) is now operating at Wushan Phase II (Ball Ø7.9m x 13.6m – 17MW- 2x8500kW) Figure 1. Gearless Mill Drive. DESIGN Materials of construction - gear & pinion Based on over 50 years of casting, heat treatment, machining, gear cutting and feedback from operating equipment ...

(30kW/1,480rpm) running a pinion through a 6.1 reduction gearbox. The pinion has 32 teeth and is meshing with a 178-tooth ring gear attached to the driving roll of the section. The rota-tion of the rolls is rather slow (0.63Hz), which gives a gear mesh frequency at 112Hz. The operator observed on the current indicator abnormal and apparently

High vibrations on a ball mill AMP Maintenance Forums. Hello everyone I have a problem with high levels of vibration at the supports of the pinion fixed and floating bearings of the cement ball mill What was the procedure for pinion to girth gear mesh alignment blue dye for contact area feeler guage for equal clearance along the 2 meshing faces

Pinion module of ball mill: Module is the ratio of pitch t to PI (m = t/ PI) between the teeth of the same side of two adjacent gears, measured in millimeters. Modulus is one of the most basic parameters in gear manufacturing. The larger the modulus is, the higher the tooth is, the thicker the tooth is. National standard ball mill pinion module ...

The multiples of vibration at 9x pinion speed seen in current data (1/2x gear-mesh frequency) are thought due to the common factor of 2 between the pinion & bull gears at the ball mill and/or the 2-part bull gear construction (gear assembly phase issue?).

Based on the speed of the output shaft and the number of gear teeth given to us, the gearmesh frequency was 3494 Hz. Note in the spectrum plot in Figure 1, that there is a peak in the acceleration spectrum approximately at this frequency (3504 Hz). However, the major peak in the spectrum is at 4828 Hz, which is 1.38 times gearmesh frequency.

Gearmesh frequency (GMF): is characteristic of each gear assembly and appears in the frequency spectrum regardless of the condition of the gears. Its amplitude depends significantly on the load at the time of reading. It is calculated according to the following formula where, Z is the number of teeth and RPM is the rotating speed of the gear.

The nominal mesh frequency is equal to 60.98 Hz, which corresponds to a 16-4 msec interval. This modulation causes the sidebands in the vibration frequency spectrum. TSA of the 1B (24 teeth) pinion with corrected pitch is presented in Fig. 6.

We are seeing 1/2, 1/3 and 1/5 of GMF — these appear due to common factors 2, 3, 5 as you wrote. This means that the pinion is badly worn out and as the common factor teeth mesh they generate these fractional frequencies. It also means that the GMF and the natural frequency are not separated by 2.5 times.

For mill gearing, detail-ed formulas have been developed to predict the align~ent corrections re-quired based on the measured temperature gradients. A study covering this Is presented in Reference 1. However, Ior most mills, with only on pinion rotating out of mesh and located approximately 20 to 30 below the mill horizontal, equation 1gives ...

Hz Hertz (frequency used to swing the grinding jars by the ball mill grinder) ... 1.2 Equipment 1.2.1 Ball mill grinder ... Retsch MM400 Shaker Mill stops automatically once the run time has elapsed. It can only be automatically run for a maximum of 99 minutes. As these studies required in many cases up to

The pinion's shaft and the gearbox are connected through gear couplings with 80 teeth each. This gear mesh frequency (80 x 2.4 Hz) can not be found in the frequency spectra. Also they opened the gear couplings and they seem OK. …

The drive of the ball mill consists of an induction electric motor, two-stage gearbox and the pinion gear. This pinion gear is mated with the girth gear mounted on circumference of the ball mill shell and in that way it transfers the motion from the drive to the shell, see Figure 1, taken from [1]. Figure 1. Mechanical system of a ball mill ...

The highest amplitude of vibration on the ball mill drive was recorded in the axial position on the drive end motor bearing; with a amplitude of 7.7 mm/s rms at 60Hz. The source of the vibration emanates from the pinion gear mesh frequency (GMF) i.e. 18 teeth X 200 rpm ÷ 60 = 60Hz. However, GMF by itself is not a defect frequency.

Reply with quote. #1. I have an issue with a gear drive on a ball mill. 2XGM is rising and i have sidebands at 107cpm and I don't know why they are at 107 (not relevant to any turning speeds ect.) I checked the root clearance a week ago and the inboard is about a .066 smaller than the outboard. The pinion is 24" long and has 24 teeth.

The cost of edge drive is low, but the pinion needs to be replaced every 2-5 years. Edge drive is mainly used in coal mills and mills with small power. The girth gear(big ring gear) and pinion are the key of the edge transmission device. Their reliable operation is directly related to the stable production of the mill.

1. Introduction. The mining industry would save about 70% of the energy involved in grinding processes if this energy was reduced to its practical minimum energy consumption .In this context, achieving a more efficient grinding in ball mills is an important issue, since these devices have a low efficiency rate partially due to the difficulty to monitor the mill filling.

High quality Ball Mill pinion Gears and rod mill pinion gear and ag mill pinion gears from China, China's leading ball mill pinion gear product, with strict quality control 16000mm Mill Girth Gears factories, producing high quality 20 CrMnTi Kiln Pinion Gears products.

Axial Vibration Of Ball Mill Pinion. Frequency domain characterization of torque in tumbling ball mills Jan 1 2018 A methodology to evaluate ball mill filling level based on torque signal is in the torque transmission chain such as gears pinions and crowns of a gear is the oscillation frequency due to torsional vibration. View Details Send Enquiry

This means that the pinion is badly worn out and as the common factor teeth mesh they generate these fractional frequencies. It also means that the GMF and the natural frequency are not separated by 2.5 times. [The natural frequency in the horizontal direction = 28.5 Hz; natural frequency = 30.9 Hz; Gear Mesh Frequency = 60.6 Hz] Looking at the ...

Mill speed is varied by changing the frequency of the current to the motor, allowing adjustments to the mill power draw as ore grindability changes. The gearless drive design was not applied to the mills in the mineral industry until 1981 when the then-world's largest ball mill, 6.5 m diameter and 9.65 m long driven by a 8.1 MW motor, was ...

Ball mill 9000 HP Motor speed 990 rpm Mill speed 14 rpm R/L ill diameter 5 m Mill bearing 22 m ----- ----- Project A Two-pinion girth gear drive Fig. 2A 1 Annulus, 2 pinions 2 Reducing gears, each 2-stage 2 Main motors 2 Turning gears Project ---- B ----- Central drive Fig. 2B 1 Double planetary gear 1 Main motor 1 Turning gear

High vibration on the ball mill drive train A and B. We are experiencing high vibration on our dual drive ball mill. The high vibration is on the motor DE bearing on axial direction. Dominant frequency is girth and pinion gear mesh. See attached spectrums and trends. Gearbox hold-down bolts are breaking due to high vibration.

resonance of the shaft lines of the ball mill at 10.8 Hz. This phenomen correspond o the excitation of a torsional natural frequency by the pinion / girth gear mesh frequency. This phenomenon is clearly identifiable on the torque and the instantaneous speed measurements when the gear mesh frequency is close to 10.8 Hz.

The rod mill is a kind of grinding mill used in concentrator production. Its working principle is that the asynchronous motor drives the reducer or synchronous motor to drive the pinion directly. The pinion meshed with the large tooth ring fixed on the barrel body to drive the barrel body for rotary motion.

When the magnetite content of the iron ore was stable, the real weight of iron ore fed to the ball mill was proportional to the weight transported by the belt conveyor. After magnetic separation, the water content in iron ore concen- F Ball mill g 3 3 P 1. Drive motor 2. Gearbox 3. Pinion axis/gear 4. Trunnion bearings 5. Pinion bearings 6.

the gear mesh frequency of the Girth-Pini on couple (49,5 Hz) and its harmonics (99 Hz, 148,5 Hz, etc.). As there is no peak at the pinion revoluti on …

Hi observing high vibs on pressing and lifting pinion de and nde bearing on a ball mill motor and main gb drive are ok clear predominant gear mesh frequency is appearing in the spectrum along with harmonics and side bands but 1st gmf is predominant side bands with pinion speed is seen no gg speed side band was observed some of the vib data ...

Fig showing zoomed view of the 3rd gear mesh frequency with side bands of pinion speed 2.03 Hz on both sides of Gear mesh frequency (Pressing side pinion DE) Fig showing time data recorded on Pinion DE bearing along horizontal direction, data shows the phenomena of …