Bucket Conveyor Product

Overview

The bucket conveyor is a versatile horizontal or lightly inclined grain transport machine used extensively in mills, elevators, and feed plants. Unlike Grain Elevator Leg systems, which can lift grain vertically, bucket conveyors are designed for horizontal or shallow-angle transport, making them ideal for moving grain between adjacent processing stages or connecting storage to processing equipment.

The conveyor uses rollers or a flat chain fitted with buckets or scoops at regular intervals. As the chain moves, each bucket picks up material from the inlet area and carries it along the horizontal path until it reaches the discharge end and is inverted (or spills) to release the load. The design is simple, reliable, gentle on product, and easy to clean or adjust.

How it works

Material enters through the Inlet Feed Chute and fills waiting Bucket or Cup buckets as the Bucket Chain Assembly moves forward. The Motor and Speed Reduction Gearbox drives the Drive Sprocket Assembly at the discharge end, moving the chain forward at a constant speed (typically 0.5–1.5 m/s).

As each bucket approaches the discharge end, it tips or is dragged upside-down, spilling its contents through the Discharge Tube toward downstream equipment. The now-empty bucket returns along the bottom run (inside the casing) and re-enters the inlet region.

The Idler Sprocket Assembly at the inlet end is spring-tensioned by the Chain Tension Adjustment System to maintain proper Conveyor Chain tension—slack enough to prevent overload but tight enough to prevent slippage.

The entire system is enclosed by the Conveyor Housing and Chutes to contain dust and spillage, and is mounted on a Structural Support Frame with Vibration Isolation Pad to dampen vibration.

Bucket selection and design

Bucket or Cup materials vary based on product type:

• Plastic (ABS, polycarbonate): Lightweight, food-safe, ideal for gentle products like flour or seed
• Painted steel: More durable for abrasive materials (crushed grain, mineral supplements)

Bucket volume (0.5–2 L) and spacing (300–500 mm) determine capacity. A 1 L bucket spaced 400 mm apart on a 1 m/s chain handles roughly 9 ton/h (1 L × 0.4 m spacing × 1 m/s × 0.65 density × 3600 s/h).

Incline conveyor variations

Standard bucket conveyors operate horizontally. For shallow angles (up to 25 degrees), the design remains essentially unchanged, though bucket shape may be modified to a scoop to prevent material rollback. Steeper angles require the Grain Elevator Leg design (enclosed buckets with tighter spacing).

Chain maintenance and lubrication

The Conveyor Chain must be kept clean and well-lubricated. The Chain Lubrication System system automatically or manually applies Oil Pump or Oiler oil via Lubrication Tubing and Oil Spray Nozzle to the chain and Drive Sprocket Wheel at intervals.

Grain dust, combined with moisture, can gum up chain rollers, increasing friction and power demand. Regular cleaning (monthly or weekly in dusty environments) is essential. Chains typically last 2,000–5,000 operating hours before requiring replacement or repair.

Tensioning and alignment

Proper chain tension is critical. Under-tensioned chains slip on sprockets; over-tensioned chains accelerate bearing wear. The Tension Adjustment Bolt allows adjustment of Idler Shaft position to fine-tune tension. A Tension Measurement Tool measures chain deflection (typically 10–15 mm at mid-span is correct).

Misalignment between drive and idler sprockets causes the chain to wander and rub against casing. Alignment must be checked during commissioning and periodically verified with a straightedge or laser alignment tool.

Motor and gearbox sizing

The Reduction Gearbox typically reduces motor speed 3:1 to 8:1, depending on target chain speed. Motor power requirement depends on:

• Chain weight and bucket weight (constant load)
• Material weight (proportional to capacity)
• Friction and belt stiffness (5–10% of full load)
• Incline angle (if any)

A 2 kW motor through a 4:1 gearbox can typically drive a 10 m horizontal conveyor handling 15 ton/h of grain.

Advantages and limitations

Advantages: Simple, gentle on product, easy to clean, flexible routing, low power per ton compared to Bucket Conveyor elevators.

Limitations: Limited to horizontal or shallow angles, longer than vertical elevators for same height, cannot handle very steep inclines without buckets becoming sealed (leading to backpressure and motor stall).

Modern mills often use bucket conveyors for horizontal product flow and Grain Elevator Leg systems for vertical lifting, creating efficient processing layouts.