ball mill shaft failure analysis


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 ... Ball-Rod Mills, based on 4″ liners and capacity varying as 2.6 power of mill diameter, on the 5′ size give 20 per cent increased capacity; on the 4′ size, 25 per cent; and on the 3′ size, 28 per cent. This fact should be carefully kept in mind when determining the capacity of a Steel- Head Ball-Rod Mill, as this unit can carry a greater ...

torsion shaft in ball mill - jv-events.be

ball mill shaft failure analysis . design of shaft in ball mill « mines crusher for sale a failure of ceramic ball mill shaft has been analyzed it was originated from stepped, . get price; design of torsion shaft in ball mills [crusher and mill] shafts, industrial and,, in the list box for the purposes of the preliminary design static torsion use for Ball Mill PINION SHAFT BEARINGS. Pinion shaft bearings are of the SKF anti-friction type mounted in a common twin bearing assembly. Bearings are fixed in place so that the pinion shaft of the mill is always in alignment with the drive components. V-belt driven mills are furnished with an outboard bearing of similar construction.

BALL MILL GEARBOX PROBLEM - Vibration

table 1 - ball mill shaft speeds, expected forcing & fault frequencies ball mills, forcing frequencies (cpm) shaft speeds 1x rpm motor speed 1,191 ball mill pinion speed 226 ball mill gear speed 18 gearbox (between motor & ball mill) nb ftf bsf 2x bsf bpfo bpfi input … Likewise, they work together to eliminate the root causes of failure, as is the case with the ball mill pulverizers, which had produced consistently high failure rates. Focus on Ball Mills. Ball mills, or pulverizers, are critical to the operation of any coal-fired boiler.

Drive Shaft in Motor – Failure Analysis - TRL

The failure occurred early in the life of the motor. Touchstone engineers were asked to determine the cause of this motor / shaft failure and suggest a solution to the problem. Analysis showed an insufficient radius was provided at the location of a change in shaft diameter where the ball bearing fit onto the shaft. 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 ...

ball mill shaft design - cruisertrailers.co.za

An Experimental Investigation into Torsional Vibration in Ball Mills. Torsional vibration in ball mills can be a serious problem - even leading to failure. ... design of such mills it is therefore important to be able to design them so that ... The rig consisted of an electric motor, a 20:1 gearbox, drive shaft … reasons of cone crusher shaft failure · causes of catastrophic failure of high mn steel utilized as crusher …. Abstract The secondary cone crusher's shields at Sarcheshmeh Copper Complex of Iran are made of Hadfield …. considered as the common cause of failure in these materials and … is fixed to the main shaft and the concave to the crusher …

Selection of torsion shaft for ball mill-Henan Mining ...

Cement Mill Horizontal Torsional Shaft Alignment Photos. torsion shaft coupling cement mill selection of torsion shaft for ball mill, torsion shafttorsion shaft for cement mills rock crusher mill rock cement mill horizontal torsional shaft alignment Contact cement mill horizontal torsional shaft concrete crushing in indio Winedgein- cement mill horizontal torsional shaft alignment photos,If you 1.Hollow shaft is a relatively important part of the ball mill, so it has high requirements for manufacturing quality. However, because the shape of the structure is special, it is still in the R zone, so when the finishing process is performed, the casting defects must not occur. such as segregation and shrinkage cavity, slag inclusion, and small cracks and so on, which are the cause of the ...

Bearing failure and how to prevent it | SKF

On these pages, you can find out more about bearing failure. You'll also find links to appropriate SKF services and solutions, as well as our bearing damage and failure analysis handbook. However, if you need help, don't hesitate to contact SKF or your local SKF distributor. Case Study - Grinding Mill Bearing Failure - SlideShare 31 Jul 2013 ... Before this time, the mill had no recorded bearing failures (as confirmed ... Figure 6: Photo of ball bearing removed during the 11/2010 failure. ... Action Due to the repeated failures, this asset triggered a Root Cause Analysis.

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

This is a ball mill in Gold Processing. The gearboxes for both drives are shaft mounted to the pinion shaft with an attached torsion arm. So the gearbox moves a bit during operation and would be a contributing factor to vibration by design. CASE STUDY: Failure Analysis of a Gear Shaft This month's case study describes a very interesting failure of a gear shaft R-Tech Materials received a gear shaft (Figure 1) from a gearbox used to drive a ball mill with the request to determine the cause of …

Ball Mill Girth Gear and Pinion Alignment - CR4 Discussion ...

Aug 28, 2011· Re: Ball Mill Girth Gear and Pinion Alignment 08/27/2011 2:07 AM pinion alighnment is done by coating the pinion with a lead based grease. after rotating the drum, the grease marks will show the contact area. the pinion should contact the girth "ring" near the center of the gears. Root Cause AC Motor Failure Analysis with a Focus on Shaft Failures Austin H. Bonnett, Fellow, IEEE Abstract— The squirrel-cage inductionmotorremains thework-horse of the petrochemical industry because of its versatility and ruggedness. However, it has its limitations, which if exceeded will

Carbon Plant Ball Mill - Drive Management Services

DMS currently are the contract supplier for all condition based monitoring services at one of the UK's leading aluminium smelting plants. Prior to the contract being awarded to DMS, the carbon plant within the smelting plant had a catastrophic failure on their main gear reducer that drives the Ball Mill. The Ball Mill was down for […] A Multidisciplinary Approach Gets to the Root Cause of a Failed Shaft: 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.

Ball Mill Critical Speed & Working Principle - YouTube

Jun 19, 2015· The effect of Ball Mill RPM speed going from sub-critical to super-critical helps understand the Ball Mill Working Principles of ball-on-ball VS ball-on-shell grinding. The Motion of the Ball … So it is a large synchronous motor coupled to a stub shaft, coupled to the pinon and it meshes with the bullgear that is on the outer circumference of the mill. Pinion speed is indeed 180. Bull gear tooth count is 241. I had a cage failure on one of the pinion bearing 2 years ago, at …

Condition Monitoring of Ball Mill with HD Technologies ...

In a ball mill, steel or stone balls are mixed with the ore and during rotation of the drum the ore is ground, by friction and compression, into a suitable fineness for the next step in the process. The main component of all mills is a rotating drum, turning with a suitable speed, gearbox, and motor. Failure analysis of high chromium cast steel liner of ball mill Ball mill is the key equipment for grinding materials. It is widely used in silicate products, such as new building materials, refractories, chemical fertilizers, black non-ferrous metal beneficiation, glass ceramics and other production industries, mainly used for dry or wet ...

(PDF) DESIGN AND FABRICATION OF MINI BALL MILL

May 30, 2016· The ultimate crystalline size of graphite, estimated by the Raman intensity ratio, of 2.5 nm for the agate ball-mill is smaller than that of 3.5 nm for the stainless ball-mill, while the milling ... Failure Analysis of Arcing and Contact Fatigue of Ball Bearings Summary: The four seized bearings submitted for metallurgical analysis were determined to have suffered deterioration of their grease to the point that it was inhibiting motion rather than enabling.

What's normal: The role of temperature in bearing applications

The ball bearings used in most electric motors are pre-greased, shielded ball bearings. Normal motor bearing operating temperatures range from 140° to 160°F. As in all bearing applications, this measurement should be taken at the bearing outer ring. If the outer ring is inaccessible, take the measurement at the housing and add 15° to 20°F ... A ball mill is a type of grinder used to grind, blend and sometimes for mixing of materials for use in mineral dressing processes, paints, pyrotechnics, ceramics and selective laser sintering.It works on the principle of impact and attrition: size reduction is done by impact as the balls drop from near the top of the shell. A ball mill …

Ball Mill Shaft Failure Analysis- SPECIAL Mining machine

Failure Analysis Shoe Bearing Ball Mill Pdf . Failure analysis shoe bearing ball mill pdf design recommendation for storage tanks it is envisaged by publishing the english version of design recommendation for storage the failure mode coefficient method and the modal analysis as. More Details Root Cause Ac Motor Failure Analysis With A Focus On The asset is a vertically-mounted, belt driven grinding mill, as shown in Figure 1. The drive spindle has three (3) bearings: two (2) cylindrical roller bearings and one (1) ball bearing. The mill is being belt driven by a 100 hp, two-pole motor. The mill normally operates at 3,150 rpm.

Fatigue Analysis of Stepped Shaft Using Comparing Simple ...

failure occurred in circular direction and from outer stepped portion of shaft to center. Because of multi axial loads (axial, bending and torsion) are occurred on that stepped portion of shaft. We calculated multi axial stresses on that stepped por-tion of ball mill shaft. Drawing of ball mill shaft is given below; In case study 2, following the change of the bearings of the grinding rolls, the plant team was looking for a way to reduce the risk of bearing failure. During mill operation roller surfaces wear down, which results in a higher dynamic load, peaks which exceed the nominal torque and, in general, an instable mill operation and lower performance.

Vibration Analysis Reporting - Bearing Failure Stages ...

Vibration Analysis Reporting - Bearing Failure Stages & Responses. ... Example 1. A furnace combustion fan, which supplies billets to a rolling mill, is highly critical and a Stage 2 defect will require that planning begin to replace the bearing. The next opportunity for replacement could be in 6 to 12 months, by which time the fault may have ... FAILURE ANALYSIS AND REDESIGN OF A WAGON WHEEL SHAFT FOR SUGAR CANE TRANSPORT ANALISIS DE FALLA Y REDISEÑO DE UN EJE DE VAGON PARA TRANSPORTE DE CAÑA DE AZUCAR FERNANDO CASANOVA Universidad del Valle, [email protected] Received for review May 10 th, 2010, accepted July 9, 2010, fi nal version July, 14 th, 2010

Ball mill torque dual pinion failure - Manufacturer Of ...

Sag mill ring gear failure chelseaecochampscoza. ball mill torque dual pinion failure SAG mill, ball mill, ring gear, dual pinion, drive systems, variable speed the Copper Mountain mills only a torque limiting coupling is used in place of an air clutch to problems on the mechanical ponents of the drive train Get Price. Oline Chat The Ball Mill Driving Device Fault and The Main Bearing Lubrication Analysis (Tong Junfeng) 2075 The friction consumption between the ball mill machine body and support bearing is equal to the total mass multiplied by friction coefficient. Since the total mass is quite large, the friction is also large.

TECHNICAL NOTES 8 GRINDING R. P. King - Mineral Tech

The geometry of a mill with conical ends is shown in Figure 8.6. The total volume inside the mill is given by Vm 4 D2 mL 1 2(Lc L) L 1 (Dt/Dm) 3 1 Dt/Dm (8.16) The density of the charge must account for all of the material in the mill including the media which may be steel balls in a ball mill… Failure of a ball and race type coal pulverizer mill shaft has been analysed. It was found that the shaft, made of EN 25 steel, failed by fatigue.

BALL MILL DRIVE MOTOR CHOICES - artec-machine.com

The mill used for this comparison is a 4.4-meter diameter by 13.6 meter long ball mill with a 5000 HP drive motor. It is designed for approximately 90 s.ton per hour. This type two-compartment mill is a state- of-the-art shell supported cement finish mill. The torque and time requirements of the mill with the ball On these pages, you can find out more about bearing failure. You'll also find links to appropriate SKF services and solutions, as well as our bearing damage and failure analysis handbook. However, if you need help, don't hesitate to contact SKF or your local SKF distributor.