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MINOX Tumbler Screeners |
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MINOX Tumbler Screening Machines are suitable
for all powders and granular materials in
the fine and ultra fine range and especially for difficult to screen materials.
They are used in all industries, but mainly in:
The simplest
screening is hand screening by eye. This is mechanically simulated by
the Tumbler Screening Machine.
The basic
motion is gyratory with the horizontally motion being similar to a The residence time of each product can be adjusted by the patented MINOX assembly in a radial and tangential angle, towards the drive axis. A three-dimensional tumbling motion, which is a mixture of plane and throw, is created. The screening material is uniformly distributed over the entire surface from the center to the periphery. It will travel in a spiral transport direction. in the center, the finer particles will pass through the mesh holes. Towards the outside, the horizontal and vertical acceleration is increasing, causing the particles with near mesh size to be separated. The remaining oversize is being carried to the outlet where the flow is also controlled by an adjustable deflector, This deflector is another factor in controlling the residence time of a material on the screen. this process is repeated on every screen deck. Anti-blinding Devices
1-Ball Cleaning - Special wear resistant and food grade rubber balls are bouncing on a perforated metal plate underneath the screen mesh. The material in the mesh is kicked out, thus reducing blinding. This system is simple to use and easy to maintain and is used for most of the granular materials. 2-Roller Brush Cleaning - Roller brushes are rotating under the screen and are used for spherical, crystalline and fragile materials. The brush arms are driven by a reduction gear mounted in the bottom pan. 3- Air-Jet Cleaning - A blower carries air or gas into the central air bell where it is distributed into the air-jet arms. The knife like air-jet has a velocity of up to 120 m/s thus cleaning the screen from underneath. A fluid bed like effect is created by the air-jet causing fine and coarse material to disperse. The air is being pulled out through the fines outlet or a suction nozzle in the bottom pan. The air-jet stream is reversed downwards above the screen while the fine material is pulled through the mesh with the use of the vacuum, in addition to the mechanical screening motion. This system is utilized for difficult to screen materials like sticky, fatty, smeary, or electrostatic charged materials, such as spices or milk powders. 4- Combined Air-Jet and Brush Cleaning - Many of the very difficult materials, such as fine plastic powders, need additional brush cleaning, along with the air-jet cleaning, to remove the material from the screen holes. 5- Straining Device - Steel or rubber plates are rotation on the screen, thus breaking up large particles and helping pass material through the screen. Technical Specifications
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plane sifter. The eccentricity can vary from 25 to 40 mm. The slow speed
V-belt drive allows speeds from 180 to 240 rpms.
When fine screening is done, the screen meshes can become blinded by
particles, dust or by static charges. This greatly reduces the capacity
and the screening efficiency. For a continuous operation, it is necessary
to have an appropriate anti-blinding system for the materials being
screened. The circular design, with its central main shaft and three-dimensional
motion, enables Tumbler Screening Machines to utilize different anti-blinding
systems.
