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Robust construction means low vibration - low maintenance
Integral System The Hercules Airswept Mill system allows grinding, classifying and drying to take place simultaneously. Pulverized material from the grinding zone is carried by the air stream to a separator mounted directly above the mill. From it, product-size material is carried to a collection cyclone while oversize particles are rejected and recycled for further grinding.
The conveying air stream can be heated to flash dry the material being ground. Most of the conveying air stream is recycled, with only a minimum amount being exhausted through the dust collector system, which is designed to remove the excess amount of air and water vapor and maintain the system under negative pressure to ensure a dustfree operation.
Performance of the system is continuously monitored using automatic controls to maintain optimum grinding and drying conditions.
Types of Separators Several type of separators allow optimum equipment selection for particular applications. Static separators are rugged, are simple in design, have no rotating parts and use no power. The inverted cone type is used for coarse grinding, the double cone type for fine grinding.
Dynamic separators permit instant adjustment and provide wide flexibility of operation. They produce cleaner top size cuts for finer grinding applications. Note particularly that the Bradley RMC separator can produce extremely fine powders direct from the mill: Top size of 100% passsing 30 microns has been achieved routinely.
Reliable Design Hercules Mills are designed to give many years of trouble-free operation even in severe service.
Access to wear parts is at ground level changes are quick and easy to make.
Heavy duty spiral bevel gears allow extended operation between overhauls.
Recirculating lube system is powered by an externally mounted pump, safety trips protect against failure.
Roll assemblies are kept free of dust by a simple, highly reliable air purge system.
Operation The standard size of Hercules Airswept Mills cover the range of 1 to 100 tons per hour. Product fineness requirements can vary from 50% passing 100 mesh to 100% passing 30 microns. Feeds containing up to 15% moisture can be dried-in-circuit to yield products with less than 0.1% moisture. The complete systems are engineered to guarantee many years of trouble-free operation and to outperform all competitors.
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Bradley Pulverizer was founded in 1886 and was based in Allentown, Pennsylvania because of the rich limestone deposits of the area. The first pulverizers produced were for the cement industry but later they were used in many other areas.
Bradley began manufacturing the renowned single roll Griffin Mill in 1886 and, since then, has strived to supply our customers with the most economical, reliable, maintenance-free, energy-efficient pulverizing system available by incorporating the latest developments.
We have equipment operating in over 40 countries in a variety of industries, including cement, steel, fertilizer (phosphate), petroleum, (barite and bentonite), mineral fillers, clay, coal, utility (limestone grinding for SO2 removal), pulp and paper, chemical, pigments, building materials, etc.
Our mills are also particularly well suited for many plant operations requiring finely ground mineral products for use in industries such as cement, phosphate fertilizer and steel.
As specialists in the design, manufacture and supply of pulverizing systems for fine and semi-fine grinding of hard, friable, abrasive materials for various applications throughout the world we can supply you the optimum system from our complete line of pulverizers, ranging in output from 1 to 150 tons per hour, which can be adjusted to produce a uniform particle size, ranging from 50% passing 150 micron to 100% passing 30 microns in a single pass.
Today, our pulverizing mills are called centrifugal ring-roll type pulverizers. They consist of three pendulum-type roll assemblies suspended from a rotating carrier. Centrifugal force, created by the rotation of the carrier, causes the roll assemblies to swing outward causing the roller at the bottom of the roll assembly to rotate against the inside of a stationary ring. The material is picked up by plows and directed between the roller and ring where it is ground using a combination of attrition and impact. When the material is ground to the desired fineness, it is sized and discharged from the mill via a screen when semi-fine grinding or via air when fine grinding.