Roller Presses for Briquetting, Compaction and Grinding
Köppern roller presses are centered around two counter-rotating rollers, supported in the frame by spherical, self-aligning roller bearings. In addition to radial loads, the bearings are able to accommodate axial loads acting in both directions, making them insensitive to shaft-skewing during operation.
The fixed roller is supported directly on the press frame, while the so-called floating roller is supported in the frame by a hydro-pneumatic spring. The movement of the floating roller constitutes the basic principle of a roller press. The extent of the roller movement (roller gap) is a function of the pressing force generated by the hydraulic system in relation to the reaction forces exerted by the material being processed and the preset "zero-position" of the roller gap. The gap itself is controlled by means of the hydraulic supply unit depending on the requirements of the specific process. This design feature guarantees that all the feed material passes through the roller gap under the same process conditions, thus ensuring that the output quality of the product remains constant.
A roller press consists of the following main component assemblies:
The press frame accommodates the floating and fixed rollers as well as the hydraulic pressurizing cylinders and housing. Different roller surfaces are used (solid form, tires or segments) to meet the specific requirements of the feed to be processed. The materials used are tailored to customers’ needs and the requirements of the processed material. They are sufficiently wear-resistant to ensure maximum service life and minimum expense, whereby conventional pressing tools can be refurbished and re-used.
Read more about wear protection
Depending on flow and mould-filling characteristics, feed is introduced into the plant either via a screw feeder or a gravity-type feeder.
Roller press categories are based on the relevant bearing size. The smallest type delivers a pressing force of 400 kN, while larger presses can generate a pressing force of up to 20,500 kN. Equipment weights vary between 2 and 400 tons.
Factors determining the selection of machine type are:
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First industrial-scale operation of the combined air classifier “2-Stage Koesep” in Vils / Austria
New HEXADUR® roller dimensions up to 2,000mm diameter
First application of Köppern HPGRs for gold and diamondiferous ores
First HEXADUR® installations in cement and slag grinding
First HPRG for comminution with roller diameter of 2.1m
Köppern supplies high-pressure grinding rolls (HPGRs) for the comminution of cement clinker
First plant for hot briquetting of direct reduced iron (HBI)
Continued development of roller presses for briquetting and compaction applications
First coal briquetting plant
Briquetting plant for zinc oxide
First roller press for briquetting of coal