New high capacity bucket elevator developments: Fernando Libonati, Aumund (Germany)
Filmed at Cemtech Asia 2015, 21-24 June, Grand Hyatt, Bangkok, Thailand
So we'll be talking about the new high-capacity bucket elevator developments from AUMUND. We have around 7400 bucket elevators being sold worldwide, and between belt and chain. So we'll first start talking about the belt, and the new developments on belt, then we will shift to chain, and the new developments in chain, and then finally we'll end up with the technical and commercial benefits.
So regarding the Belt Bucket Elevators. We have 3900 units installed, and we can reach capacities of up to 2000 tonnesnes per hour, for fine material, up to 10 mm. Now we've belts with strengths of 4200 newtonnes per mm, and we can reach lifting heights of up to to 200 meters. We found the opportunity to develop this belt bucket elevator, not only for fine material, but also for coarse material.
Coarse material we mean up to, majority 80 mm. Now not only, did we want to develop for coarse material, but also high capacity. So first we tried using single wide bucket of 1400 , 1600 mm wide, which is possible to use, but you need special reinforcement to the buckets. So we found that the best configuration, is to use a double or triple bucket configuration. Now, the limit here, is the width of the belt which can be found in the market is maximum 2.4 meters. So with these 2.4 meters and a triple bucket configuration we can reach capacities of up to 3000 tonnesnes per hour. Now the tricky part here, is to on the feeding section, because we have three buckets, so we need even feeding of these three buckets, and we'll talk about this later on.
So we'll just go through the steps, of investigation through this new development with the belt bucket elevator for course material. So first we started with the discrete element analysis, so with this we would feed up the boot completely to start at a critical situation,and here we can see the behavior of the feeding into to the buckets. We started out with a 10mm which was our experience, and went up to a 100 mm, and with this analysis, we could check, the forces acting on the fixings.
So, this was a very important first step. So, another important aspect to look at was the discharge, because if you have a different bucket configuration, different bucket design, with different protrusion, you need to insure that you have a correct discharge of material, so the right material projection, because if you're too fast or too slow, you can end up having your material, all to the boot. Then we went to the test elevator.
This test elevator is located in our head quarters in Germany and Limburg. So, this is a closed circuit. We have a belt, a bucket elevator, and we used for this test, several different types of grain size going from 20 up to 100mm. And in each one of these groups, we did tests for 100 hours.
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