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used in drives in mills, shredders, pumps and fans. They are extremely maintenance-friendly and can operate at partial speeds. DTPK couplings are externally supported. Their runner parts are directly installed with the hub to the shafts of the motor and driven machine, which must accommodate the axial
part inventory. If required, ring motor drives can be fitted to shell-supported grinding mills up to the largest sizes. SAG/ball mill circuit incorporating pebble crushers and a POLYCOM® high-pressure grinding roll. SAG and ball mill for gold ore grinding. One of three SAG mills with 9.75 m diameter and 2 x 4000 kW drive power. These mills
The design of ball mill drives is, in many ways, more difficult than for AG and SAG units. This stems from the fact that the ball mill is generally smaller in diameter, so that the notional tangential force at the shell is higher for a given power input (although this effect is somewhat offset by the ball mill's higher rotational speed).
5.2 Motor voltage 5.3 Power factor 6. Mill arrangement 14 6.1 Drive train arrangement 6.2 Drive train efficiency 7. Application experiences 15 7.1 Ball Mill drives with synchronous motor and air clutch/fluid coupling. 7.2 Ball Mill with slip ring induction motor. 8. Maintenance and operational issues 18 8.1 Synchronous motor and exciter
Once you know the ideal speed of rotation for your mill jars, you will need to design your mill around this critical parameter. With most ball mill designs, you have two areas of speed reduction to tweak: from the motor drive shaft to the drive pulley and from the roller bar to the milling jar.
•The gearbox between motor & ball mill had been recently rebuilt. •Two identical ball mills were in place at the plant (1A & 1B). •These machines are used to pulverize or crush lime into small particles (dust) that is then made into a slurry and injected into the flue gases to reduce pollution.
The design of the hydraulic drives REDULUS GMH with hydrau-lic motor plus planetary gearbox offers an intelligent solution for an efficient combination of hydrostatic power transmission and mechanical torque multiplication. We also offer planetary gearboxes for electric REDULUS GME as efficient supplement to the complete drive arrangement.
B. Drives Economics at the time of plant design and mill purchase determine the drive to be used. The simplest drive is the low speed synchronous motor with speeds in the range of 150 to 250 RPM connected to the mill pinion-shaft by either an air clutch or flexible coupling.
the desired motor power and drive rating, the maximum design mill speed, and the maximum design ball charge volume (Barratt, 1989). For single pinion and dual pinion drives, with 21 MW now a distinct possibility, the probability of pinion changes to a higher mill speed should always be considered when set-
The plant has totally reconstructed 37 Chinaware ball mills with 37 sets of Gozuk variable frequency drives. Take one of its 40T Chinaware ball mill as an example: the power of this machine's motor is 132KW, and actual working power is 115KW. This machine works 18 hours per day, and 30 days per month.
Its mining industry applications include motors and drives for mine hoists and fans, pumps, grinding and SAG mills, conveyors, and draglines and mining shovels. The company's product range includes large, rugged three-phase medium-voltage electric motors, both synchronous and induction up to 100,000 hp. (74.6 MW), with multiple poles for ...
The subject of this paper is a synchronous drive of grinding ball mills 4 MW, 150 rpm, 6 kV, 50 Hz on the base of PWM CSI. The system is installed at the …
In the past the conventional method of driving large ball mills included some form of speed reducing gear between the higher speed driving motor and the lower speed ball mill. Process developments in the mining and cement industries have increasingly tended toward the use of ever larger ball mills for grinding their products. As the horsepower drive ratings required …
This work involved design audits of mills developed by all major mill suppliers. The mills were some of the largest in the world including the Collahuasi SAG and ball mills (40 ft and 26 ft respectively) and the 40 ft AG mill at Cape Preston. 2. Failure Analysis and Remedial Design: Antamina Ball Mills (Antamina); Red Dog Mine SAG
Pebble mills are a type of ball mill and are also used to reduce the size of hard materials, down to 1 micron or less. Because of their fairly simple design, ball mills and pebble mills are less likely to need costly repairs (unlike other crushing or extraction equipment) making them an attractive option for businesses on a budget.
Any type of drive can be furnished for Ball-Rod Mills in accordance with your requirements. Belt drives are available with pulleys either plain or equipped with friction clutch. Various V- Rope combinations can also be supplied. When a motor drive is selected, please mention which drive arrangement is to be used.
This paper discusses the process design and layout of the Constancia Project comminution circuit. The circuit consists of a 60 x 113 primary crusher, two 16 MW SAG mills and two 16 MW ball mills. All four mills are twin pinion with wound rotor motor and gearbox drives. Provision for pebble crushing is
The design, manufacture and supply of a 300T capacity . silo, a 3.0TPH roller mounted, packaged ball mill and ... mounted ball mills suitable for quicklime slaking and regrind applications. The mills range from 600mm ... diameter with a 4.6M EGL with a …
Ball Mill Gear Failure Analysis Analysis of SAG mill motor drive failures Regrind Mill Refurbishment Project management, inspection and technical services for refurbishment of used ball mill Oceanagold (Philippines), Inc. Didipio Gold Copper Project Project Coordination Ok Tedi Mining Limited, PNG Ball Mill Repairs Technical support
2 GEARLESS MILL DES The gearless mill drive eliminates ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings, used within a conventional mill drive system. By mounting the rotor poles directly onto the mill, the mill itself becomes the …
Generally the driven mill sheave is of split hub construction to facilitate field assembly. V-belt drives allow use of higher speed motors, …
Many grinding mill owners choose a variable speed drive for their mill to cope with variations in ore hardness, plant throughput and other process considerations. Two important engineering decisions that owners must make before purchasing a variable speed drive system are the selection of the motor nominal design speed and the motor maximum speed.
5 Inch Batch Ball & Rod Mill Roll Drives. Sepor's 5" Series Batch Ball and Rod Mill Drive is a rugged, heavy duty mill drive especially suited for steel grinding jars, or large porcelain grinding jars (5 gallon size). The drive mechanism is a 1/2 HP gear motor with a …
The main purpose of this study is to determine the proper design of power transmission system for rotational ball mill. Power transmission is the part …
Use the auxiliary drive to simplify build-up welding on your mill or to conveniently re-position the mill during maintenance. Connected to the gearbox or electric motor via an automatic overrunning clutch, the auxiliary drive has a Kirk key interlocking system to prevent it from working simultaneously with the main motor.
ball mills Drive packages for vertical mills Drive packages for silo discharge, filling and ... motor scoops, motor adapters – Disk or drum brakes ... – Complete design of the mechanical drive train – Drive solution from one source – High power density
LSS design (if solid shaft) 4.15 Electrical supply [X] [...] On motor power P / ... Motor bracket with V-belt drive Motor scoop Other, see sketch ... Ball mills - - 2.00 Coal mills - 1.50 1.75 Pulp and paper industry Debarking drums and machines 1.55 1.80 -
The direct-drive motor is the product of the development of servo technology. The assembly robot application directly drives the motor. 2.2.4.3.1 Higher precision and repeatability. The direct-drive motor is a low-speed, high-torque output directly connected to the load without a speed reduction mechanism.
JR slip ring motor for ball mill JR ball mill motor adopts rotor string resistance full-voltage start-up, which has the advantages of small starting current, large starting torque, high efficiency, low noise, low vibration, good ventilation performance, reliable operation, convenient installation and maintenance.. Inquire Now
This aspect is taken into account by the drive manufacturer at an early motor design stage [11]. Table I, all synchronous motors used in SAG mills have a …