1 2 time gearmesh frequency on ball mill pinion

Preprint 13-050

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 ...

ball mill gearbox vibration

Sulfur - Responsive HTML5 Template. BALL MILL GEARBOX PROBLEM Vibration. BALL MILL PINION SPEED 226 BALL MILL GEAR SPEED 18 GEARBOX (Between Motor & Ball Mill) NB FTF BSF 2X BSF BPFO BPFI INPUT BRGS, SKF#22330 15 491 3,192 6,384 7,358 10,507 OUTPUT BRGS, SKF#22240 19 97 783 1,566 1,848 2,446 GEARBOX GEARMESH FREQ …

for Aligning and Maintaining Large'Ring Gears

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 ...

Milling - Energy intensive and high maintenance

Ball mills on the other hand, as far as process requirements are concerned, did not require variable speed. However, frequency converter based drive systems provide benefits that improve the ball mill operation. FIXED SPEED CONFIGURATIONS The key issue to operate a mill in a fix speed mode is the starting.

A Gearbox Vibration - Fact or Fiction - Beta Machinery

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.

INTELLIGENT GEARING SYSTEM – SOLUTION TO …

specifically to overcome the problem of operational gear mesh misalignment. Refer to Picture 1. Picture 1 Typical misalignment damage on a girth gear 2. Background Different mills are used in the mineral processing and power generation industry. The work done in this article concentrates on horizontal rotating mills i.e. ball mills, but the same

AN EXPERIMENTAL ANALYSIS OF VIBRATION OF A BALL …

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 ...

Gear Fault Diagnosis by Motor Current Analysis ...

(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

Four Common Faults of Rod Mill and Their Solutions! - Xinhai

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.

Ball Mill Maintenance & Installation Procedure

1. Establish vertical and horizontal centerline of mill and pinion shaft against the effects of this, we recommend that the trunnion bearing sole plate be crowned so as to be higher at the center line of the mill. This is done by using a higher shim at the center than at the ends and tightening the foundation bolts of both ends. Ball Mill Sole ...

VIBRATION STUDIES OF CEMENT MILL

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 …

Ball mill pinion | prmdrive

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 ...

Fractional Gear Mesh Frequencies – Reliability Management ...

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 ...

Time synchronous averaging of ball mill vibrations ...

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.

Gear Fault Diagnosis by Motor Current Analysis ...

(30kW, 1480rpm) 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 rotation of the rolls is rather slow (0.63Hz), which gives a gear mesh frequency at 112Hz.

Ball Mill Gearbox Case History - BCEASE 2016 | Bearing ...

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?).

Vibrations On Tube Ball Mill Pinion Gear Bearings

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

ball mill girth gear root clearance

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

Gear Fault Diagnosis by Motor Current Analysis ...

The system is composed of a low-voltage AC motor (30kW/1,480 rpm) 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 rotation of the rolls is rather slow (0.63Hz), which gives a gear mesh frequency at 112Hz.

Vibration Analysis of Rotating Machinery - MATLAB ...

In this example, it is arbitrarily assumed that the impact causes a 2 kHz vibration signal and occurs over a duration of about 8% of 1/fMesh, or 0.25 milliseconds. The impact repeats once per rotation of the gear. ipf = fGear; fImpact = 2000; tImpact = 0:1/fs:2.5e-4-1/fs; xImpact = sin (2*pi*fImpact*tImpact)/3;

Double Helical Gear - an overview | ScienceDirect Topics

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 ...

CTL-A Multidisciplinary Approach Gets to the Root Cause of ...

An 8-inch diameter pinion shaft, which was driving a 12-foot diameter bull ring gear on a ball mill, failed after a period of rough operation. The crack originated in the area of a keyway at a clutch hub, Figure 1. This geometry acts as a stress concentrator and crack nucleation, in this region, is not uncommon.

Ball Mill Pinion - Vibration Analysis & Machinery ...

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.

Fractional Gear Mesh Frequencies – Reliability Management ...

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.

Frequencies of a gear assembly | Power-MI

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.

High vibrations on a ball mill | AMP Maintenance Forums

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. …

BALL MILL GEARBOX PROBLEM - Vibration

Since we have a common factor other than one between the two gears on the ball mill we can expect to see the appearance of fractional gearmesh frequency and harmonics in our vibration data. In this case since the common factor is 2, we expect to see the appearance of 1/2x gearmesh and harmonics in our vibration data.

Supplementary Material Understanding the influence of ...

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

Spectra Spectrum Motor DE - AX 15.06.2011 8:04:35

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.

High Vibration Ball Mill Duel Pinion Drive - Mechanical ...

Gear mesh frequency is present at 1x to 3x and similar amplitudes on both sides. The Mill Trunion Bearings are at fair vibration As with limited information at this time only the report with a few spectrums and a table of overall velocity reasons it is a bit difficult to get a handle on the issue.

Ball Mill Foundation Ball Mill - gaswars.in

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 ...

Ball mill ring and pinion gears standard meshing

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

Monitoring grinding parameters by signal measurements for ...

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.

Mill Girth Gear High Vibration Problem Case Study

Mill Girth Gear High Vibration Problem Case Study. A case study has been conducted on the wear problem of a set of large helical gears of a ball mill used for cement production at the shiraz cement plant the ball mill has a nominal capacity of 80 t h −1 the overall diameter and length are respectively 4000 mm and 12990 mm the total weight of the ball mill when fully charged is …

Investigative techniques for detecting torsional stresses ...

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.

Ball Mill pinion Gears and rod mill pinion gear and ag ...

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.

How to install and align the girth gear and pinion | prmdrive

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.

Vibration Sensor | Frequency | Amplitude

Vibration applications Compressor Blower Sag mill and Ball mill motor, reducer and pinion Crusher motor inner/outer pinion shaft CHARACTERISTICS OF VIBRATION Amplitude Displacement Units are mils or microns(1 micron = 0.001mm or 0.039 mils. Velocity Units are in/sec or mm/sec Acceleration Units g. Where 1g=32.2ft/sec2 or 9.81. m/sec2. Spike ...

Frequency domain characterization of torque in tumbling ...

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 vibration on the ball mill drive train A and B | AMP ...

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.