How a bucket elevator lifts grain

A bucket elevator, or leg, is a tall enclosed belt loop running between a pulley in the boot at the bottom and a head pulley at the top. Buckets bolted to the belt scoop grain in the boot, carry it up one side, and throw it into the discharge spout as they swing over the head pulley. Capacity is simply how much grain each bucket holds, times how many buckets pass per second.

Controls

Labels

Animation speed

Belt speed

Bucket volume

Buckets per meter of belt

Step through it

Intake and bootGrain pours from a hopper into the boot at the bottom of the leg, where buckets swing around the boot pulley and scoop it up.
Up the legLoaded buckets climb inside one enclosed casing and empty buckets return in the other, so the belt never stops moving.
Over the head pulleyAt the top the belt wraps the head pulley. Centrifugal force flings the grain out of each bucket into the discharge throat.
Capacity knobsFaster belts, bigger buckets or tighter bucket spacing all raise capacity. Try the largest buckets at close spacing.
Down the spoutGravity carries the grain down an angled spout to a bin, dryer or truck. Spout angle must be steep enough that grain keeps sliding.

The capacity formula

Capacity equals bucket volume times buckets per meter of belt times belt speed. In one second a 3 m/s belt carrying 3 buckets per meter delivers 9 buckets. Multiply by 3600 for an hourly rate, then by a fill factor because buckets never arrive brim full; this model assumes 75 percent.

Wheat weighs about 0.77 tonnes per cubic meter, and one bushel is about 0.0352 cubic meters. Real legs are rated by the manufacturer for each grain and bucket style, so treat these figures as a simplified estimate.

Try it: set belt speed to 4 m/s with 6 liter buckets at 6 per meter. Capacity climbs past 11,000 bushels per hour, the scale of a large commercial elevator.

Speed has limits

Run the belt too slowly and buckets will not throw grain clear of the head; too fast and grain is thrown back down the leg or damaged. Grain dust inside legs can also explode, which is why safety rules require belt speed monitors and regular cleaning.

Where Avid uses this

Grain handling sits right downstream of the field decisions that Avid's VerdantaIQ precision agriculture platform is built to inform.

Sources

Handling Effects on Commingling and Residual Grain in an Elevator (Transactions of the ASAE)USDA Agricultural Research Service
Grain dust characterization and repeated handling in pilot-scale bucket elevator legs (M.S. thesis)Kansas State University, K-REx repository
Grain Handling: OverviewOSHA

How to cite this model

Avid Solutions International. (2026, November 11). How a bucket elevator lifts grain [Interactive 3D model]. Avid Field Lab. https://avidsolutionsintl.com/explore/bucket-elevator

Last updated November 11, 2026

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