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Linear Guide Systems designed for small high precison OEM and industrial applications Call 800 284 9784 to speak with an engineer
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Linear Guide Systems designed for small high precison OEM and industrial applications Call 800 284 9784 to speak with an engineer
installed and commissioned 2 x 5 MW dual pinion ring geared mill drive system will be shown and discussed Also the accuracy of the load sharing between the two 5 MW motors during starting normal operation and stopping will be demonstrated using real measurements from an operating system
Ball mills are commonly used in the manufacture of Portland cement and finer grinding stages of mineral processing one example being the Sepro tyre drive Grinding Mill Industrial ball mills can be as large as m 28 ft in diameter with a 22 MW motor [4] drawing approximately % of the total world s power see List of countries by electricity consumption
Load sharing is a term used by many to describe a system where multiple drive and motor sets are coupled and used to run one mechanical load In the strictest sense load sharing means that the amount of torque applied to the load from each motor is prescribed and carried out by each drive and motor set Identifying Load Sharing Applications
Made for optimal grinding Pinion mill drives are widely used in the mining industry to grind materials to a requested size FLENDER Load Sharing Girth Gear Units cover the entire power range from 1 200 to 10 000 kW in stand alone operation and up to 20 000 kW with the use of a dual drive
The gearless drive design was not applied to the mills in the mineral industry until 1981 when the then world s largest ball mill m diameter and m long driven by a MW motor was installed at Sydvaranger in Norway Meintrup and Kleiner 1982
Rack and pinion drives are an age old mechanism widely used for converting rotary motion into linear motion However myths and misconceptions abound regarding the use and application of rack and
The mills were rated to operate with approximately 100 tons of charge They were about 30 feet in diameter and were driven by a ring gear around the circumference There were significant mechanical savings by driving with twin motors Using WRIMs had the twin advantages of much easier starting and no issues with sharing the load
Grinding Mill Clutches Forward this manual to the person responsible for Installation Operation and Maintenance of the product described herein Without access to this information faulty Installation Operation or Maintenance may result in personal injury or equipment damage Use Only Genuine Airflex Replacement Parts
All Altivar ATV drives Cause Application notes about VT and CT loads Resolution VARIABLE TORQUE LOADS Many types of loads require reduced torque when driven at speeds less than the base speed of the load Conversely such loads may require increased torque when driven at speeds greater than the base speed of the load
Hofmann is a leading supplier of balancing systems for the small armature and electric motor industry We offer a flexible range of balancers to accommodate a variety of rotor sizes as well as the different levels of automation required to match production volume
These products are part of an important order for electric motor drives for 18 ball mills and semi autogenous grinding SAG mills with dual and single pinions Autogenous grinding means that the mining ore essentially grinds itself Such ball mills are used for grinding and crushing mining ore within a large rotating drum
Made for optimal grinding Pinion mill drives are widely used in the mining industry to grind materials to a requested size FLENDER Load Sharing Girth Gear Units cover the entire power range from 1 200 to 10 000 kW in stand alone operation and up to 20 000 kW with the use of a dual drive
Our GMD eliminates all mechanical components of a conventional mill drive system such as ring gear pinion gearbox coupling motor shaft and motor bearings By mounting the rotor poles directly onto the mill the mill itself becomes the rotor of the gearless motor
Two gearless mill drives GMD power two new 38 foot meter autogenous grinding mills At megawatts each the mill drives are the most powerful in the world They drive mills with a capacity to grind about 2 200 tons of ore per hour each expanding production capacity to 36 million tons of ore per year from 18 million tons
In general backlash in gears is play between mating teeth For purposes of measurement and calculation backlash is defined as the amount by which a tooth space exceeds the thickness of an engaging tooth It does not include the effect of
Load torques which have the potential to drive the motor under equilibrium conditions are Working motor have each mechanical nature of work like shaping cutting grinding or sharing require constant torque Lathes boring m/cs milling m/cs steel mill coiler and electric traction load · This type of characteristics
Motors & Drives; Powerful gears in rolling mills After many years of service the gears in a hot strip rolling mill must be replaced But the new gears face a dual challenge
drive for a grinding mill is shown in figure 1 Figure 1 Top view of SAG mills with alternative drive options; left side dual pinion drive including motor gearbox pinion and girth gear; right side gearless ring motor
single or dual motor configurations In this type of application the pinion is mounted on pillow blocks driven by a low speed motor or a motor and en closed gear drive The gear is mounted on the mill using a flange bolted con nection see Figure 2 for one type of flange installation Both the center distance and alignment are adjustable
In the island state of Papua New Guinea Ok Tedi Mining Limited OTML runs the copper and gold mine Ok Tedi OTML s drive train infrastructure at the Ok Tedi mine is in excess of 30 years old In order to ensure long term profitability OTML is using Siemens technology to supply and install complete new variable speed drive trains for the two Semi Autogenous Grinding mills SAG 1 and SAG 2
Millmotor/drive High powered efficiency •Dual motor load sharing between two TMMetso QdX4 Mill Drives • Low speed synchronous or induction Motor with Variable Speed Drive VSD • Dual motor drives are capable of Inching and creeping Frozen charge detection Use of standard temperature and vibration sensors
Mill Grinding found in Easy access for sample recovery and cleaning Microswitch prevents operation while lid is open Powerful dual speed motor 14 000 Powerful drive Easy to clean working surface made of stainless steel Two different grinding heads can be attached to the drive Heads are easily changeable Grinding
Synchronous motors continue to be a viable alternative to induction motors because of efficiency advantages Long used for providing leading kVARs for PF improvement and helping with the device switching in Load Commutated Inverter LCI drives these machines are efficient prime movers for large Mill applications Both in motor efficiency and in low base speed configurations the synchronous
Motors connected to VFDs receive power that includes a changeable fundamental frequency a carrier frequency and very rapid voltage buildup These factors can have negative impacts especially when existing motors are are a number of potential problems that can become real when a variable frequency drive VFD is used to power an existing induction motor
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