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With a power requirement of up to 30 MW, tube mills belong to the largest driven machines. They crush minerals, ores, coal, or cement clinker by impact and friction until the material is pulverized. The tube mills, which can have a diameter of up to 15 m and a length of up to 20 m, are installed horizontally. With tube mills, a distinction is made between different drive variants. Flender gear units for tube mills particularly specializes in:
Single pinion drives
Central drives
Load sharing girth gear units
For all three variants, FLENDER offers the entire drive system: Motor, gear unit, couplings, pinion, and girth gear, as well as auxiliary drive, safety devices, and diagnostic systems.
Ball mills and rotary kilns are most challenging applications that demand a big deal from the drive system. High performance and reliability are very important. When it comes to milling of iron ore, limestone and clinker large axial and radial forces occur. Single-pinion drives and Flender gear units for tube mills must be able to withstand the acting forces permanently.
FLENDER MDSS is a standardized gear unit that was optimized to meet the high requirements of the application. For the girth gear/pinion drive, a FLENDER gear unit with input shaft on both sides from the standard range is generally used as the main gear unit. The main motor is connected to one side of the gear unit, while the auxiliary drive is connected to the other side.
The pinion at the mill’s girth gear can be connected via a double-jointed coupling with spacer to ensure the adjustability of the pinion. Single pinion drives are supplied in both fixed and self-aligning design. MDSS offer flexibility and precision for the optimum tooth mesh.
Your benefits at a glance
Optimized gear teeth geometry
High rigidity of housing
High manufacturing quality
Minimum noise generation
Highest efficiency
Applications
Crushing of minerals, ores, coal, or cement clinker in the building materials industry and coal preparation
Harsh working conditions and high dust concentrations in the production of cement, limestone and gypsum place high demands on the drive system In the case of central drives, the mill is driven from the end face.
Since there is no girth gear transmission, relatively large gear units are required even for low power rating ranges. The FLENDER load sharing gear units such as our DUORED 2 and FLENDER planetary gear units such as Planurex 2 and Planurex 3 series, offer the high power capacities demanded.
PLANUREX 3 central drives (HCCP) are low-maintenance and reliable. Their compact design offers a good price-performance –ratio. Moreover the less space requirement leads to cost savings when designing mills and their supporting structures.
Your benefits at a glance
Low-weight and compact drive
Save running costs through high efficiency and optimized maintenance intervals
High manufacturing quality
Low noise emission
Optimum power/weight ratio
Easily combined with other gear units such as upstream helical, worm, bevel or bevel-helical gear units
Optimized gear geometry
Low acquisition costs per newton meter
Long service life
First-class quality
Short delivery times
Very good price-performance ratio
Applications
Crushing of minerals, ores, coal, or cement clinker in the building materials industry and coal preparation
Particularly innovative are the direct meshing FLENDER girth gear units (DMG2). This Flender gear units for tube mills was developed for driving tube mills with girth gears.
Here, the gear unit forms a single unit with the girth gear with which it meshes directly. Compared to the traditional pinion/girth gear variant with external pinion and girth gear, the system with the gear unit for the girth gear is by far more favorable. Tried and tested elements were brought together in an optimal combination. Fewer parts are required, and consequently the space requirements, and the installation and operating costs are reduced.
The current generation of DMG2 gear units is available in four sizes. Consistent standardization results in a high availability of individual components. The DMG2 Flender gear units for tube mills 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. Worldwide, over 400 of these large gear units have already been deployed successfully.
Your benefits at a glance
Compact and efficient drive
More effective use of the girth gear
Perfect load distribution across the entire girth gear width
Applications
Crushing of minerals, ores, coal, or cement clinker in the building materials industry and coal preparation
