Grinding Mill Foundations
We have never encountered a foundation vibration problem with operating gearless driven mills, although there may be examples of this about. The main problems with …
Failure analysis of a tandem mill ring gear
A roll end ring gear of a tandem hot rolling mill suddenly fractured in service after 21 years, which is equivalent to 917,000 rolling cycles. There was no record of a sudden overload. This component is part of a spindle which rotates at 100–200 rpm and its function is to transfer torque to the rolling mill. ... The ring gear failure in ...
II-100 II-101 INTRODUCTION
Torsional vibrations can lead to premature gear failure, as can differential stiffness and thermal ratcheting [1]. Gearless drive stators can deflect excessively under load resulting in contact …
Ball Mill Girth Gear and Pinion Alignment
Link: SAG Mill Girth Gear Failure Averted _____ Best regards, HeviiGuy Register to Reply: TonyS. Guru. Join Date: Aug 2010. Location: Resting under the Major Oak ... the grease marks will show the contact area. the pinion should contact the girth "ring" near the center of the gears. Register to Reply: TonyS. Guru. Join Date: Aug 2010. Location ...
SAG Mill Liner Design
To a more significant degree than in other comminution devices, SAG Mill Liner Design and Configuration can have a substantial effect mill performance. ... Metal to-metal contact (nut washer retaining ring mill) …
How to install and align the girth gear and pinion | prmdrive
2.1 ring gear mating surface detection. After the ring gear is closed to the cylinder according to the installation mark, tighten the connecting bolts on the mating surface, and check whether there is a step on the side of the gear (the step is required to be as small as possible, otherwise it will affect the end runout of the ring gear).
Online gear and bearing monitoring
The mills are produced by Cemtec and are the primary units for ore grinding. Thus, a poten-tial failure of one of the these mills stops the whole process. The mill is driven by two gearboxes on the left and right sides of the milling drum, which transfer rotation from two motors to the ring gear mounted on the drum. The drive power is 7200 kW.
lubrication systems for sag mills africa
sag mill ring gear failure lasilviana. Mills SAG Ball Rod Point to a thumbnail to enlarge the image Click to display largest image in this Polysius ball mills wet overflow trommel screen discharge ring gear two piece single helical and pinion drive shell supported mill slide shoe bearings lubrication system rubber liners parallel shaft gear .
SAG Mill Components
SAG Mill Components. ... from gear vendors determine the minimum number of pinions which can be used to drive the mill as well as the number of gear sections. If the mill requires approximately 6000 horsepower or less, it is possible to drive it with a single pinion. To date, however, economics has dictated that most mills over 3500 horsepower ...
sag mill ring gear failure
sag mill ring gear failure. failure modes grinding mills. failure modes grinding mills Heavy Industry is a high-tech company integrating R D production and distribution and provides crusher sand making grinding equipment mobile crushing station etc. mature products and solutions used in aggregate mining and waste recycling.
The Siemens 42ft gearless mill drive, still an …
tural failure. The gap between the model and the real sys-tem is usually closed by prototype testing, however this is not an option for a 42ft Gearless Mill Drive. The ring motor is not self-supported and needs the mill to fix the rotor poles to and it needs the mill foundation to support the stator. Finally you would need a few thousand tons ...
Girth Gear Pinion Infrared Imaging and Temperature Measurements
Monitoring pinion temperatures on mill gear pinions is an effective and efficient means of monitoring alignment and operating condition. Toll Free USA +1 (866) 419-1619; Worldwide +1 (715) 214-2162; ... Pinion misalignment is a common failure cause which can lead to a variety of gear tooth failure modes through overloading. Measuring ...
Literature Review: Gearless Motor Failures – A Mill …
In contrast to the cracks in the KCGM mill that seem dormant according to [1], consider the Candelaria SAG mill failure described by Yanez and Tapia in [3]. The SAG mill cracked through the flange and into the shell and …
Sag Mill Installation Procedure | PDF | Bearing (Mechanical) | Gear
Sag Mill Installation Procedure - Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. The document outlines the procedure for installing a sag mill, including pre-installation preparations, verifying foundations, preparing baseplates, assembling and installing mill components, installing bearings, aligning gears, installing motors, piping ...
SAG mill drive train modernization at OK Tedi Mining in …
SAG mill drive train modernization at OK Tedi Mining in PNG ... • Running a SER 4 System on the slip-ring motor of SAG ... unbalance and bearing and gear meshing faults in geared Our paper ...
Ball Mill Maintenance & Installation Procedure
The mill gear should be lifted by the pinion causing a downward pressure on the pinion shaft bearing. ... Install the retainer ring and splash ring as shown. Mill TRUNNION LINERS. In most cases the trunnion liners are already mounted in the trunnions of the mills. If not, they should be assembled with attention being given to match marks or in ...
What's the Difference Between SAG Mill and Ball Mill
Difference Between SAG Mill and Ball Mill, from the working principle, application, structure, etc. Grind and blend solid or hard materials into smaller pieces by means of shear, impact and compression. ... The big gear of the ball mill fits on the mill shell, the size is bigger, the big gear is divided into half structure, the radial and axial ...
Milling
The gearless mill drive is covering the upper power range of the mills. The torque is transmitted to the mill directly through the magnetic field in the air gap of the motor, eliminating the gear …
Success Stories
Horsburgh & Scott used their gearing expertise to complete a repair on a mill gearbox for a metals and plastics fabricator in only one week! The failed gearbox was removed from the customer's facility by another party and then shipped to …
TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS …
numerous GMDs for ball mills and SAG mills have been installed in the minerals industry. The main advantages are that the GMD is adjustable in speed, and thus can fulfill the customer requirements with respect to flexibility and adjustability of the process, and that it does not need any gear box and ring gear and therefore eliminates
Mill drive selection for semiautogenous grinding mills …
SAGMILL NNDN RING 13uu PIN~ GEAR AIR CLUT SAGMILL I RINGMOTOR I I {I 1 1 Fig. 1 — Twin-pinion drive gear driven motor. Fig.2— Gearless mill with a ringmotor. of the grinding systems. NPCS were capital costs in Table 1 are based on variable speed ac drive complete determined on grinding systems that operations with three different produc- with ring and …
(PDF) Failure Prediction of Induction Motors: A …
Failure Prediction of Induction Motors: A Case Study using CSLGH900/6-214, 5.8 MW, 11 kV/3ph/50 Hz Sag Mill Motor at Goldfields, Damang Mine May 2020 Global Journal of Researches in Engineering
sag mill pinion failure modes
Sag or ball mill helical ring gears description nenssrinding mill gear failure coal surface mining samacgrinding mill gear failure description the driving system of grinding ball mill is the gear drive inion gear sag mill miningbmw pinion gear sag mill cr4 of large multi-pinion and ring motor drive systems has led to a and used.
Ball Mills and Sag Mill problem | vibration/alignment/balance
We have two Ball Mills and one Sag Mill. We had some visual inspection on pinion and ring gears, during these inspections we found some abnormal wear on this gears (pictures …
ABB Library
Paper held at SAG Conference 2011 - By S. Gaulocher (ABB), K.S. Stadler (ABB), Th. von Hoff (ABB), R. Veldsman (ABB), A. Fuerst (ABB) and J. Koponen (ABB): Gearless mill drives (GMDs) are the workhorse in the mineral processing industries, more specifically when it comes to grinding crushed ore and cement (in various production stages) in semiautogenous (SAG) …
Semi-autogenous grinding (SAG) mill liner design and …
operation of SAG mills. SAG mills are currently the technology of choice in hard rock milling operations for reducing primary-crushed ore to ball mill feed. In recent years, the trend has been towards larger-sized SAG mills with diameters of 10.4 m (34 ft) and above, with the largest being 12.2 m (40 ft) in
SIMINE Gearless mill drives
wear to the mill lining. The mill's direction of rotation can be changed simply with a switch so that wear on the liner is distrib-uted equally from both sides. Shorter maintenance time for mills Simple control of the inching and creeping modes lets you quickly set up mill mainte-nance procedures without endangering employee safety.
Gears and pinions
A complete range of gear and pinion sets, inspections, design, installation and alignment services to drive your mill's performance Introducing a new name ... • AG and SAG mills • Ball and FGD mills •Pebble and rod mills • Multi-compartment mills • Rotary kilns and dryers • …
Element analysis and independent quality assurance …
Failure Analysis of a SAG Mill A 34ft diameter SAG mill developed cracks in the corner weld near the end of its service life. Gilmore Engineers inspected the Mill and conducted Finite Element …
SAG Mill Grinding Circuit Design
The first major commissioning failure on the SAG mill occurred during installation when the mill was inched without adequate lubricant flow, resulting in the wiping of the feed end trunnion bearing. ... The open trunnion bearings are sealed with a rubber ring which proved ineffective in preventing ingress of water, and occasionally solids, from ...
Demystifying The Sag Mill: What Is It And How Does It Work?
The SAG mill, also known as the Semi-Autogenous Grinding mill, is a crucial piece of equipment in the mining industry. ... The motor is typically an electric motor that is connected to the mill through a gearbox and a pinion gear. The motor's power and speed are carefully selected to ensure optimal grinding performance and efficiency ...
Literature Review: Gearless Motor Failures – A …
The Collahuasi motor was for a 40 ft SAG mill. The Antamina 38 ft SAG mill was also driven by an ABB motor and the hanger plates had not failed on that machine after several years of operation. Similarly, the Sossego motor …
ABB Ring-Geared Mill Drives
of mills and ball mill ap-plications, and are able to cover the power range up to the mechanical limit of the gearbox or the ring gear. The solution provides ad-justable speed for AG and SAG mills, or the opportu-nity to tune the speed of the ball mills for optimal grind-ing and maximum through-put, without the need to
Failure Prediction of Induction Motors: A Case Study …
kV/3ph/50 Hz Sag Mill Motor at Goldfields, Damang Mine C. K. Amuzuvi α & H. Warden σ. Abstract- This paper proposes a generalised feed-forward artificial neural network model that fulfils the failure prediction of a three phase 5.8MW, 11 kV Slip-Ring SAG Mill Induction Motor at Goldfields Ghana Limited, Damang Mine. It provides
Increasing availability through advanced Gearless Drive …
Mill speed can be adapted to upstream and downstream processes – avoids overgrinding, and optimizes load distribution between SAG and ball mill (Mular, Halbe & Barratt, 2002). Power consumption is influenced by load respectively torque and mill speed. This means that further energy can be saved if a mill speed below the rate speed is re-
SAG Mill Variable Speed Drive
Gearless or ring motor drives; Twin CCV or Cycloconverter; Twin ICI or Load Commutated Inverters using variable frequency; Quadramatic II LCI drive. For power requirements up to approximately 4,476 kW (6,000 hp), it is convenient to drive the mill through a ring gear and single pinion arrangement.