GERMANY – Bucket elevators are playing a standard equipment role in the bulk material conveying technology wherever vertical conveying is involved. In more than 30 years, Aumund continuously refined the bucket elevator technology and offers nowadays strong and most capable solutions worldwide for the vertical transport of bulk material. The belt bucket elevator BWG-GK makes the transport of material with particles up to 80 mm possible.
The main task during development of a belt bucket elevator for coarse material is the protection of the belt from damage by the conveyed material. Aumund's narrow, overlapping bucket configuration permits the belt to disappear entirely behind the buckets. It is thus protected and no coarse material can become jammed between the backs of the buckets and the belt. The outer edges of the belt are simultaneously protected.
Another necessity is to ensure a safe bucket attachment and, considering the loading conditions of the buckets, even in case of scooping. Here, the design of the Aumund steel cord belt with transversal steel cord reinforcement provides high pull-out strength and a reliable fixing for the bucket fastening.
The plate screws developed by Aumund differ significantly from conventional DIN plate screws and have been designed for a longer belt service life and higher carrying capacity. Therefore, further attachments to increase the clamping force at the bucket fastening are not necessary. The advantage s that the belt runs smoothly and without high abrasion on the drive pulley.
Furthermore, the belt of a bucket elevator needs to provide a high tensile strength, a low net weight and a low elongation, while simultaneous running in good alignment is demanded. Aumund's technology and manufacturing creates belt strengths up to 4,200 N/mm for lift heights of more than 200 metres. On the front side as well as on the back side of the tensile members steel cord transverse reinforcements strengthen the belt. The steel cord ensures that the belt does not de-laminate, even under the influence of temperature.
Newly developed rubber compounds based on ethylene propylene diene monomer (EPDM) allow operational ranges up to a material temperature of 150°C for Aumund belt bucket elevators. Even peak temperatures up to 170°C may be reached. Load tests under industrial daily routines proved that EPDM-belts are much more resistant to aging than belts made of styrene-butadiene rubber (SBR).
The Aumund Group is active worldwide. The conveying and storage specialists have special expertise at their disposal when dealing with bulk materials. Please visit Aumund.com.
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