Bucket elevator

A bucket elevator (also: Elevator ) is a mechanical continuous conveyor for vertical transport. This energy- budget funding has already been installed in the first automated mills about 250 years ago. The term " Elevator" has become established in the premises of the mills and feed industry for a bucket elevator. In America is meant by a " Grain elevator " the whole silo. " Elevator" also means passenger elevator in the Anglo- American usage.

Construction

In a closed housing an endless belt running (multiple polyester -polyamide inserts with rubber pad ) with screwed cups.

• At the elevator boot the incoming material ( grain, feed raw materials, etc. ) is drawn from the cups.
• In an elevator shaft (steel plate) the conveyed material is transported upwards. In the second slot, the empty cup run back down.
• In the Elevator head the conveyed material is ejected by the centrifugal force in a parabolic curve from the cups. The minimum rate to be 1.6 m / s, otherwise the rear bed comes in the descending strand, reducing efficiency and leads to wear and tear, dust dispersion and explosion hazard.
• The drive is usually done by a gear motor.

It can be mounted per meter belt between four and ten cups. The conveying speed is usually between 1.8 and 3.8 m / s High performance elevators deliver up to 500 t / h

Since elevators represent very large sources of risk for dust explosions, is to pay attention to an effective aspiration, to prevent the dust inside.

There are mandatory additional safety devices or usual:

• Backstop
• Speed ​​monitor
• Misalignment Guardian
• Rupture Disks
• Sprinkler systems with temperature sensors

History

End of the 18th century, the elevator was invented in the mill operation, as the steam engine came up and the mills made ​​to a location-independent power house. To date, they were always tied to a location where there was water or wind. These new machines had to mill the lowest possible cost and without much use of people make the vertical transport of grain and grind. Later elevators or elevator were used for all sorts of loose bulk materials.