For a steady Running of the Belt
In order to enable a steady running of the belt and to extend the service life in view of the abrasive material, the BEUMER team exchanged the existing segmented laggings of the drive pulley by specially adapted ones equipped with ceramic. These are crowned for a steady straight run.
The drive pulleys are equipped with segmented laggings. A steady running of the belt is ensured by the crowned drive pulleys. (Pictures: BEUMER Group GmbH & Co KG)
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No material can penetrate between belt and bucket.
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The design, which is easy to maintain, enables to quickly replace the single segments of the segmented lagging through the inspection hatches. Thus, it is no longer necessary to exchange the complete drive pulley. The segmented laggings are rubberised, with linings made of full ceramics or steel. The choice depends on the material conveyed.
The buckets are adapted to the crowned shape of the drive pulley and thus lie flat on, which considerably increases the service life of the belt. Their shape allows for smoother running and therefore less noise generation.
Depending on the intended use, the operator receives the buckets in the design that suits him best. They can for example have a rubber bottom or be made of high-quality steel.
The proven BEUMER HD technology impresses with a special bucket connection: In order to prevent coarse-grained material from penetrating between bucket and belt, the bucket is provided with an elongated back plate, which can be mounted flush to the bucket elevator belt.
In addition, with the HD technology, the buckets are mounted firmly to the back of the belt with forged segments and screws. “All the screws would have to get lost for a bucket to tear out,” explains Papenkort.
To keep Everything running straight
In order to achieve a permanently correct tensioning of the belt, BEUMER mounted an external parallel take-up device without product contact in Duisburg, which ensures that the take-up pulley is limited to parallel movement. The tension bearing is designed as inner bearing in a completely encapsulated construction. The bearing housings are filled with oil.
“A part of our HD technology is the cage-type foot pulley which is easy to maintain. The bars are hardened due to the abrasive material conveyed and screwed into the cage-type foot pulley to enable a rapid replacement. The take-up pulley is equipped with a double deflection cone, which reliably prevents damage to the belt caused by jammed bulk materials,” explains Papenkort.
Satisfaction led to follow-up Order
“This modification enabled us to increase the availability of our vertical mill circulation bucket elevator and to be more competitive on the long term,” Frank Baumann says happily. “Compared to a new investment, it was possible to reduce our costs and we were operating faster.
At the beginning we had to convince ourselves more than once that the retrofitted circulation bucket elevator was in operation, because the noise level had changed drastically and we were not familiar with the smooth running from the previous chain bucket elevator”.
The company was so enthusiast about the retrofitting that it commissioned BEUMER Group to optimise also the other two bucket elevators with regard to the conveying capacity. Also in this case, the operator complained about continuous off-tracking, buckets hitting the shaft casing and difficult maintenance conditions. “In addition, we wanted to further increase the throughput of the mill and were therefore interested in greater flexibility regarding the conveying capacity of the bucket elevators,” explains Baumann. In 2020, the Customer Support of the system supplier also solved this problem. “We are completely satisfied,” states Baumann. “In the course of the retrofitting, we could also reduce the energy consumption of the bucket elevators”.
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