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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;
Ball Mill @ 226 rpm pinion gear & 18 rpm bull gear. Helical gears. Clutch between gearbox & ball mill ... • The presence and absence of vibration at the ball mill gear-mesh frequency and multiples explain most of this difference between loaded & unloaded levels. 0 0.5 1 1.5 2 2.5 3
The cycles are mapped to a normalized phase time φ * ranging from 0 to 1 (i.e. one cycle), and averaged into f s T bins, where f s is the sampling frequency (12 Hz) and T = T * /λ is the average ...
1 2 time gearmesh frequency on ball mill pinion Graco DB2966 Husky 1590 1 1/2 Air Operated Double Shop Graco DB2966 at Applied which includes 1 1/2 Non Metallic Diaphragm Pump 1 1/2 ANSI Flange Inlet 1 1/2 ANSI Flange Outlet 100 gal/min Max Flow Wetted Parts Polypropylene Ball Santoprene Diaphragm Santoprene Seal Polypropylene.
Pinion 18 teeth 1 x 2 x 3 x 3 Bull 226 teeth 1 x 2 x 113 (113 is prime). Thus, the factor common to both of these gears is 2 (improper set). 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.
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 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 frequency 1,84 Hz and its second harmonics,
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
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.
Table 2: Summary of Specific Gravity Tests Specific Gravity Method Tested Avg of 6 By 12 3456 Average of 2 pycnometer methods Hazen 2.93 2.91 2.74 2.85 2.86 2.75 2.84 Average of 3 ASTM Method D 854 ATT 2.86 2.82 2.68 2.78 2.81 2.71 2.78 SAGDesign - Water displacement Dawson 2.76 2.82 2.54 2.81 2.75 2.82 2.75 Phillips Enterprises Wax coated Phillips 2.76 2.18 2.25 2.33 2.26 --- 2…
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.
986 Figure 1. Flow sheet of a grinding plant Figure 2. Distribution of the mass inside the ball mill The total mass inside the ball mill in operation consists of the mass of a fresh raw materialmFM, which is fed into the ball mill shell, mass of material which is rejected from the air classifiermRM, and of the mass of grinding bodies, mGB, which in this case are the steel balls of various sizes.
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.
Four sets of gears had micro-pitting and were closed to the initial pitting level (ball mills 1, 2, 5, and 6). The other four sets (ball mill nos. 3, 4, 7, and 8) had different levels of pitting. So, the pitting is classified into three groups according to the pitting progression level.
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
grinding mill Avoid catastrophic failures by finding problems early Issues that are not caught early can lead to breakdowns and unplanned downtime, significantly increasing repair costs and production losses. 1. Mill Visuals and Vitals Quickly catch visual failures, oil contamination and slurry leaks 2. Mill Mechanical Verification
Unfortunately the misalignment is so huge that I could get the laser beams inside the targets. 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.
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, spectrums and photos shown in the attachment.
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 ...
= 2.5 in • 20-tooth, 8 pitch, 1-inch-wide, 20° pinion transmits 5 hp at 1725 rpm to a 60-tooth gear. • Determine driving force, separating force, and maximum force that would act on mounting shafts. Example Problem 12-1: Forces on Spur Gear Teeth P N RAO 8 − Find transmitted force: (12-3) Ft = 2T Dp Ft = (2)183 in-lb 2.5 in = 146 lb
I have a pulverizer that was vibrating at 1 ips measured at various bearings within the gearbox. This vibration appeared after the gearbox was overhauled. It is a double reduction gearbox. %99 of the vibration is occuring at 332 Hz, which corresponds to the gearmesh frequency of the first reduction. The 1x pinion speed sidebands are almost ...
A large part of the fatigue life is spent initiating cracks, whereas a shorter time is required for the cracks to propagate. Stress concentrations in the fillet often cause multiple crack origins, each producing separate cracks. In such cases, cracks propagate on different planes and may join to form a step, called a ratchet mark (Figure 2). 2.
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?).
Ball Mill Pinion Vibration Analysis Machinery. I have an issue with a gear drive on a ball mill 2XGM is rising and i have sidebands at 107cpm and I dont 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 It is obvious i have there is obvious ...
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 ...
Finally, results obtained from ball mill circuit for "n" and "b" indicated that these parameters were equal to "n Ball Mill =80-87" and "b Ball Mill =0.84-1.1" at optimum condition. Ball Mill High Vibsamp Maintenance Forums. Ball mill high vibs. Observing high vibs on pressing and lifting pinion DE and NDE bearing on a ball mill. Motor and main ...
In this case I am seeing (30 T = 1 X 2 X 3 X 5) and (210 = 1 X 2 X 3 X 5 X 7) 2 X 3 X 5 as the common factor. Pinion 30 teeth and GG has 210 teeth. Will this create gear ratio issues uneven locking and releasing of 2 mating teeths. But no 1/2 or 1/3 or 1/5 GMF seen in the data. Unquote. My reply was: Quote:
1 2 time gearmesh frequency on ball mill pinion. INTELLIGENT GEARING SYSTEMSOLUTION TO · The mill drive system consists of the main mill motor the main reduction gear box mill pinion and girth gear. The mill is also equipped with a barring drive which is either connected to the main drive reduction unit or alternatively mounted at the back of ...