Bucket Elevator Capacity and Lift Height: What the TDTG Series Numbers Actually Mean

A small bucket elevator like the TDTG26/13 moves 1–3 tons of grain per hour up to a height of 20 meters. Scale up to the largest model in the same bucket elevator line and it handles 200–300 tons per hour up to 45 meters. That twelfth-model range is the entire practical decision space for vertical conveying equipment on a feed mill, grain terminal, or port facility: pick too small and you throttle your pelletizer or loading rate; pick too large and you pay for motor power and headroom you never use. This guide walks through how to read the model table correctly and what actually drives the choice between models.

The Short Answer

Size the elevator to your busiest upstream or downstream equipment, not your average throughput, and size the lift height to your tallest silo or highest discharge point plus a safety margin. Undersizing capacity creates a bottleneck at the base of every batch; undersizing lift height means the elevator physically cannot reach where the material needs to go. Both mistakes are expensive to fix after installation, since the elevator leg, motor, and foundation are all sized together.

How a Bucket Elevator Works

A bucket elevator lifts material vertically using a series of buckets fixed to a belt or chain that loops around a drive pulley at the top (the head) and a tensioning pulley at the bottom (the boot). Material enters at the boot, is scooped up by the moving buckets, carried upward inside an enclosed casing, and thrown clear at the head as the buckets pass over the top pulley — this throwing action, called centrifugal discharge, is what empties each bucket into the outlet chute before it starts its way back down empty.

Because the entire load is carried vertically rather than pushed along a horizontal trough, a bucket elevator needs far less floor space than a screw or chain conveyor moving the same tonnage — the trade-off is that it needs ceiling or building height instead. This is why bucket elevators are the standard choice for feeding tall storage silos and multi-floor production buildings.

TDTG Series Capacity and Lift Height by Model

The TDTG series bucket elevator covers twelfth models, which is enough range to match nearly any single leg on a grain or feed line without over- or under-sizing the motor.

Raw Material Characteristics That Affect Model Choice

Bulk density, particle size, and abrasiveness change which model actually delivers its rated capacity in real operation. Whole grain such as corn or wheat is free-flowing and fills buckets evenly, so it reaches the rated capacity range shown in the table. Powdery material like bran or premix packs more loosely into the bucket and can trail dust during the throw at the head, so mills running mostly fine powder often size one model up from the raw tonnage calculation to keep effective throughput on target.

Abrasive materials — sand-contaminated grain, some mineral feed additives — accelerate wear on the bucket lip and the casing at the head, where material impact is highest. For these materials, the head wheel matters more than the capacity rating: The TDTG series can be optionally equipped with rubber inserts for the head wheel, which only requires replacement of the worn working surface without the need for overall replacement of the wheel body. The entire life cycle of the equipment can significantly save costs.

Key Design Features

• The casing (barrel) uses a four-side occluding process formed in one piece, giving better rigidity and sealing than welded or bolted-panel casings.
• Optional head wheel rubber inserts, only replace worn surfaces, no need to disassemble the entire wheel set.
• An optional self-cleaning boot combines coarse and fine adjustment to reduce material residue left in the boot pit between runs.
• A comprehensive safety configuration protects both the equipment and personnel during normal operation.

Common Faults and Troubleshooting

Belt slip at the head pulley is usually caused by insufficient boot tension or a worn pulley lagging surface — checking tension first is faster than replacing lagging, and resolves most slip cases on its own.

Material spillage from the boot typically means the boot is being fed faster than the buckets can pick it up, causing material to build up and overflow — reducing the feed rate at the inlet, or confirming the elevator model matches actual infeed rate, resolves this.

Backlegging, where material falls back down the up-leg instead of discharging cleanly at the head, points to running speed that is too slow for centrifugal discharge to work properly, or buckets spaced incorrectly for the material's flow characteristics.

Residue buildup in the boot pit between batches is the direct target of the self-cleaning boot option — if this is a recurring issue on a standard boot, it is worth specifying the self-cleaning version on the next unit or retrofit.

Selection Logic and Procurement Risk

Match the elevator model to your busiest connected equipment, not your daily average tonnage. A pelletizer that peaks at 12 T/H needs an elevator rated at or above 12 T/H even if the mill averages 8 T/H across a shift, because the elevator either keeps pace with the peak or becomes the line's bottleneck during it.

Add a margin to lift height, not just capacity. If your tallest silo sits at 38 meters, specifying a 40-meter-rated model rather than the exact height leaves room for future storage expansion without a full elevator replacement — the incremental cost of the next height bracket is far lower than a second full installation later.

Confirm power rating against your actual site voltage and starting method before ordering. The maximum power figures in the table assume standard start conditions; sites with weaker grid connections or frequent stop-start cycles should discuss motor starting current with the supplier before finalizing the model.

Frequently Asked Questions

What is the difference between the number pairs in a model name like TDTG36/23?

Answer: The first set of numbers represents the head wheel diameter of 360mm; the second digit represents the bucket width of 230mm. The larger the first and second sets of numbers, the higher the conveying capacity the equipment can achieve.

Can one bucket elevator model be used for both grain and powder?

Yes, within the same capacity bracket, but expect the effective throughput on fine powder to sit toward the lower end of the rated range, since powder fills buckets less completely than free-flowing grain at the same belt speed.

Does a taller bucket elevator need a bigger motor at the same capacity?

Yes. Lifting the same tonnage higher requires more work per unit time, so models rated for greater lift height at a similar capacity carry a higher maximum power rating, as shown by comparing the 45-meter and 30-meter models in the table above.

How much floor space does a bucket elevator need compared to a screw or chain conveyor?

Considerably less. Because the load travels vertically inside a single enclosed leg rather than along a horizontal trough, a bucket elevator's footprint is close to its casing width and depth, while a screw or chain conveyor moving the same tonnage needs a run of trough as long as the conveying distance.

Written by: Yuda Machinery Engineering Team
Based on years of experience in feed machinery manufacturing, equipment design and overseas project installation.