vibration problem in coal mill gearbox

Gearbox Typical Failure Modes Detection and Mitigation

vibration analysis systems problems with the lubricant such as foaming Another scenario for conducting borescope inspections is during an EOW sweep Depending on gearbox configuration the inspection may not be thorough because of the difficulty in accessing and photographing certain components Mitigation Strategies 17 Bearing Axial Cracks Carburized instead of through

OPERATION AND MAINTENANCE OF CRUSHER HOUSE FOR COAL

followed by a ball mill In this context the SAG mill and ball mill are considered grinders rather than crushers Crushers may be used to reduce the size or change the form of waste materials so they can be more easily disposed of or recycled or to reduce the size of a solid mix of raw Grade C.V K Cal/Kg Ash Moisture A >6200 19.57 B 5601 6200 19.57 23.97 C 4941 5600 23.92 28.69 D

Gearbox Modeling and Load Simulation of a Baseline 750 kW

Gearbox Modeling and Load Technical Report Simulation of a Baseline 750 kW NREL/TP 500 41160 February 2009 Wind Turbine Using State of the Art Simulation Codes

Brief Introduction of the Coal Vertical Mill and Its Spare

14.09.2015  The final coal powder is at about 62 ℃ 2 Regarding the vibration problem the coal vertical mill can deal with it much better than the other grinding mill First the coal is a not hard material Second it is easy to deal with the bed of material What you shall be noticed is the stopping feed of the coal meal problem.

Understanding of resonance essential for solving vibration

17.09.2013  Understanding of resonance essential for solving vibration problems It s no secret that severe vibration can destroy bearings ruin shafts and potentially disrupt production What s less well known is that resonant machine components and supporting structures can magnify even small vibration problems enough to damage connected equipment or cause catastrophic machine failure By

EME 304 Mechanical Vibrations Sheet 3

The landing gear of an airplane can be idealized as the spring mass damper system shown in Fig 2 If the runway surface is described y t = y o cosωt determine the values of k and c that limit the amplitude of vibration of the airplane x to 0.1 m Assume m = 2000 kg y 0 = 0.2m and ω = 157.08 rad/sec Fig 2 Modeling of landing gear Dr./ Ahmed Nagib Elmekawy 6 of 13 EME 304 Sheet 3

Vibration Severity Chart

Vibration Severity Chart How To Use This Severity Chart 1 3 in 1 chart plots vibration measure and levels for Acceleration vs CPM Velocity vs CPM and Displacement vs CPM 2 Knowing a machine s RPM i.e CPM and the vibration sensing technique see table below determine how the machine should perform when new or rebuilt and what level might warrant an ALERT or DANGER condition

Published May 10 2011 Vibration Analysis

However by balancing mills typically measure only the MD vibration especially with rigid assembled rolls suction rolls deflection compensated rolls press rolls Without measuring the vibration in all three directions you don t know the exact contribution of the rotating rolls to paper machine vibration This is why a complete vibration study must be performed Vibration analysis may be

SERVICE MANUAL AND SPARE PARTS LIST

No problems will be encountered in han dling installing and operating the ZF M gearbox if the instructions in this manual are followed Should a repair be neces sary a qualified technician will have no difficulty in doing the repair work in ac cordance with the detailed instructions given on the following pages In addition ZF M Service Stations dis tributors and dealers are available for

Problems and treatment of production decline of ATOX50 raw

02.02.2021  The raw mill model of a company is ATOX50 The grinding condition of this vertical mill is stable since it was put into production in March 2008 By the summer of 2015 in order to meet more stringent environmental emission requirements electric dust collector at the end of the kiln has been replaced with electric bag compound dust collector After technical modification dust collection

GEAR NOISE AND VIBRATION A LITERATURE SURVEY

GEAR NOISE AND VIBRATION A LITERATURE SURVEY Mats Åkerblom mats.akerblom Construction Equipment Components AB SE–631 85 Eskilstuna Sweden Abstract This paper is a survey of the literature on gear noise and vibration It is divided into three parts Transmission error Dynamic models

Bearing and Vibration Analysis Articles

Diagnosing a Low Speed Gearbox Problem the Skoghall Mill installed extensive on line equipment for the shock pulse measuring of bearings on Board Machine No 7 BM 7 Thanks to this investment today they can measure with a focus on wrapping drying and pressing quantities in the board machine 1 050 items of stock every 24 hours Earlier it took between four and six weeks to do the same

BALL MILL GEARBOX PROBLEM

BALL MILL GEARBOX PROBLEM BACKGROUND INFORMATION OBSERVATIONS 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 MOH MOV MOA MIH MIV MIA GIH GIV GIA GOH GOV GOA G S PK MEASUREMENT POINT 1A BALL MILL WAVEFORM LEVEL

Misalignment

There are many instances whereby coupling misalignment is the source of the problem and axial vibration as low as only 20 to 30 percent of the radial vibration It is supposed that the amount of axial vibration depends on the coupling type and the type of misalignment parallel or angular Resonance can magnify lower levels of axial vibration from other sources so that it looks like large

Dynamical behavior of coal shearer under the influence of

16.09.2021  Aiming at the problem of severe vibration and abnormal wear and tear of various components in coal shearer under slant cutting conditions

Problems and treatment of production decline of ATOX50 raw

02.02.2021  The raw mill model of a company is ATOX50 The grinding condition of this vertical mill is stable since it was put into production in March 2008 By the summer of 2015 in order to meet more stringent environmental emission requirements electric dust collector at the end of the kiln has been replaced with electric bag compound dust collector After technical modification dust collection

GE Digital Twin Stories

Worm gear radial bearing problem found on a mill Power Mill Value Story of the Week Savings 180 000 Tubing leak found at a liquid natural gas plant Oil and Gas LNG North America Value Story of the Week Savings 61 000 Stator cooling water temperature issue identified Power Generator Latin America Value Story of the Week Savings 76 000 Broken valve diaphragm found on an

vibration vertical roller mill

01.03.2016  re vibration vertical roller mill There are a number of reasons for high vibrations in vertical roller mills such as 1 Failure of the grout or cement material under the steel beams embedded in the foundation top which allows oil to penetrate further degrading the concrete The anchor bolts which are typically large in diameter continue to exert force into the foundation and the base

A Brief Tutorial on Machine Vibration

You may be tasked with solving a vibration problem or you may be overseeing someone else and you need to understand the process This tutorial discusses the symptoms taking measurements analyzing the data additional testing understanding the physics and finally fixing the problem It provides practical information that has proven useful over several decades in correcting all types of

Three causes of gearbox failure

17.05.2018  The alignment of the gears in the gearbox housing is critical and assessment of the alignment of the gearbox housing bores is very important when a rebuild is being done In mining applications where gear reducers are in heavily loaded applications we sometimes see firsthand that reducer housings can get distorted or bent Even a small amount of misalignment can cause premature gear

A BASIC UNDERSTANDING OF THE MECHANICS OF ROLLING MILL ROLLS

of other problems in a mill such as a power cut mechanical problems of transportation or in the water cooling system Problems of this kind can never really be calculated but they have a detrimental effect on all rolling schedules including stresses in the roll As regards abnormal rolling conditionswhich are more or less very normal for rolling millsroll damage often occurs

Handling shaft deflection runout vibration axial motion

Shaft deflection runout vibration and axial motion Chapter D4 Page 6 Contact Kalsi Engineering Search this handbook Figure 5 Groove wall wear due to dynamic runout This photo shows wear of the environment side wall of a seal groove that occurred during extensive operation at 346 ft/min with 0.010 dynamic runout The wear which is limited to the inner half of the groove wall is caused

Nonlinear torsional vibration analysis of motor rotor

12.03.2019  Zhang R Zhuo C Parametrically excited vibration of electromechanical coupling system of a rolling mill main drive based on rotor induction current influence J Vib Shock 35 17 1–6 2016 Google Scholar 31 Li C.X Shearer China Coal Industry Publishing House Beijing

Gear Mesh Vibration in Coal Pulverizer

05.07.2003  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 invisible.

Gear Manufacturing Gearbox Repair

Gears and gearboxes for every industry Machinists Inc is one of the largest and most diverse gear manufacturing companies in North America We service a wide spectrum of industries including power generation mining timber products wind construction oil

Detection of Gear fault using vibration analysis The new generation of condition monitoring and diagnostics systems differs by the detailed solution of diagnostic problems that allows making a step from machine vibration state monitoring to the monitoring of the machine technical condition Most rotating machine defects can be detected by such

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The Role of Vibration Monitoring in Predictive Maintenance

vibration and plant operating data such as flow temperature or pressure Continuous monitoring detects the onset of component problems in advance which means that maintenance is performed only when needed With this type of approach unplanned downtime is reduced or eliminated and the risk of catastrophic failure is mitigated It allows

Failure analysis of air cooled condenser gearbox

01.10.2014  This problem was identified by condition monitoring team which observed increase in vibration level drastically This problem was observed in three other gearboxes while changing the blade angle during summer Failure analysis of gear is a subject of interest to many practicing engineers and researchers Before starting the failure analysis of the gear literature review was done to

Root Cause Analysis and Implementation A Case Study

All the gearboxes have been placed on a vibration analysis route allowing their behavior to be tracked The failed coupling on gearbox No 3 led to a condition assessment of the subcell The oil was sent for analysis and returned with a high particle count Vibration readings were as high as 0.2 inches per second at the misalignment frequency The readings also indicated severe bearing damage

Machinery Vibration Limits#8

pumps compressors pulp refiners ball mills furnaces and piping systems He has a Master of Science in Solid Mechanics from the University of Calgary and is a member of the Vibration Institute ABSTRACT Changes in case vibration readings are used to monitor rotating machinery condition Absolute levels of vibration are indications of condition except where structural resonances e.g

DETECTING CLASSIFIER COAL MILL DAMAGE USING A SIGNAL

D Romahadi et al Classifier Coal Mill Damage Detection using Vibration Signals Analysis 177 problems with the spectrum Fig 3 showed the Classifier Coal Mill machine being measured There were three main components namely motor gearbox and rotor The motor was on the top and was connected to the gearbox via the

How Do I Analyze Bearings Gearbox Vibration Using

01.05.2014  we have Gearbox Premium make model SPL MD2 760 fitted with girth gear of cement mill and motro kw is 3150 994 rpm Girth gear is 2 years old and gearbox is new we are facing vibration in DE 7mm and NDE of input shaft is 4.5mm/s can you tell what may the problem

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A related problem is the isolation of vibration sensitive machines from the normally occurring disturbances in a building car or bus traffic slamming doors foot traffic elevators Examples of sensitive machines include surgical microscopes electronic equipment lasers MRI units scanning electron microscopes and computer disk drives Figure 1 shows a common example of a vibration

Vibration Monitoring A Case Study

01.01.2014  Coal mill main drive assembly bag house fans and booster fans As shown in Tables 1 4 the fault prone components on these units are the gears bearings couplings shafts impeller/blades and electric motor Figures 3 and 4 respectively show the schematic and pictorial representations with the positions of the various VCM sensors of the coal

How to solve the problem of spits in coal vertical mill

28.03.2020  How to solve the problem of spits in coal vertical mill 1 Theoretically speaking if the wind speed of the nozzle ring of the coal vertical mill is sufficient the mill will not discharge slag it will only be full and finally the vibration will stop However in actual production the wind speed of the nozzle ring cannot be increased indefinitely so slag discharge occurs.

How vibration analysis can detect alignment problems

24.02.2014  Vibration issues related to alignment normally show up at either a 1X or 2X vibrational frequency says Perez Figure 1 After detection correcting the problem can be accomplished with a laser alignment tool Source Ludeca A good vibration data collector and analyzer can tell you with a high degree of certainty through cross channel phase that you have a misalignment problem

A Gearbox Vibration

uncovered problems with the way the routine monitoring was done As well vibration was present in the spectra that seemed to be unrelated to gearmesh frequency Was there a problem or not 1 INTRODUCTION This case history started with a phone call requesting assistance to check the condition of a gearbox in a fertilizer plant Overall vibrations collected with a periodic predictive

A Balan The conventional methods for the measurement of resonant frequencies vibration and noise in electric machines are laborious and very time consuming This paper presents laboratory

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Planetary gear noise and vibration are primary concerns in their applications in helicopters automobiles aircraft engines heavy machinery and marine vehicles Dynamic analysis is essential to

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