Grain Silo Conveying System

In a modern grain storage project, the silo itself is only one part of the complete system. The efficiency, reliability, and operating cost of a grain storage facility largely depend on the conveying system that connects grain receiving, cleaning, drying, storage, and dispatch processes.

Based on our experience in grain storage projects, we design the grain silo conveying system according to the customer’s actual requirements, including grain type, storage capacity, conveying distance, throughput, site layout, and future expansion plans.

A properly designed grain conveying system should achieve three main goals:

• Maintain stable grain flow during loading and unloading
• Minimize grain damage and contamination
• Reduce dust generation and energy consumption

COBAN provides complete grain handling solutions including bucket elevators, belt conveyors, scraper conveyors, air-supported belt conveyors, screw conveyors, pneumatic conveying systems, and related dust control equipment for grain silos, grain terminals, flour mills, rice mills, and agricultural storage facilities.

What Equipment Is Included in a Complete Grain Silo Conveying System?

A complete grain silo conveying system normally consists of several types of equipment working together:

The correct combination of these machines determines the overall performance of the grain silo handling system.

1. Bucket Elevator for Grain Silo

Vertical Grain Lifting Equipment for High Storage Silos

Bucket elevator is one of the most important machines in a grain silo conveying system. It is mainly used to lift grain vertically from ground level to the top of silos, cleaning machines, dryers, or distribution systems.

In most grain storage projects, the bucket elevator is installed after receiving pits or before the rotary distributor on the silo roof.

Working Principle

The buckets are fixed on a belt or chain and move continuously between the bottom inlet and top discharge section. Grain enters from the bottom, is lifted vertically, and discharged smoothly at the required height.

Main Parameters

Advantages

High vertical lifting efficiency

Compared with inclined conveyors, bucket elevators require much less installation space and are ideal for modern high-capacity grain silos.

Stable grain handling

The low-speed bucket design reduces impact during loading and unloading, helping protect grain quality.

Suitable for large silo projects

For projects with silo heights above 20 meters, bucket elevators are usually the most economical solution.

Limitations

• Mainly designed for vertical transportation
• Not suitable for long horizontal conveying distances
• Requires regular inspection of belt tension and bucket wear

Engineering Recommendation

For large grain storage projects:

• 500-5000 tons silo systems usually use standard belt bucket elevators
• Large grain terminals with higher capacity may require heavy-duty chain bucket elevators
• Fragile grains such as rice should use lower-speed elevators to reduce breakage

2. Belt Conveyor for Grain Handling

Reliable Horizontal Grain Transportation Solution

Belt conveyor is widely used in grain silo loading, unloading, and transfer systems because of its simple structure, stable operation, and large conveying capacity.

It is commonly installed:

• Between receiving equipment and bucket elevators
• Between silos
• From dryer outlet to storage silo
• For truck or ship loading systems

Main Parameters

Different Types of Grain Belt Conveyors

Open Belt Conveyor

Suitable for:

• Outdoor grain transfer
• Short distance conveying
• Large grain storage yards

Advantages:

• Lower investment cost
• Easy maintenance
• Large capacity

Disadvantages:

• More dust exposure
• Requires additional dust control equipment

Enclosed Belt Conveyor

Suitable for:

• Grain terminals
• Flour mills
• Indoor storage facilities

Features:

• Closed dust cover design
• Reduced grain contamination
• Better working environment

Engineering Recommendation

For maize and wheat storage projects in Africa, South America, and Southeast Asia, belt conveyors are usually selected for horizontal grain transportation because they provide a good balance between investment and operating cost.

3. Scraper Conveyor for Grain Storage

Flexible Horizontal Conveying Inside Grain Facilities

Scraper conveyor, also called drag conveyor, uses a chain or scraper flight moving inside a closed trough to transport grain.

It is especially suitable for:

• Grain receiving systems
• Multiple silo distribution lines
• Hopper bottom silo discharge systems

Main Parameters

Advantages

Multiple discharge points

Compared with belt conveyors, scraper conveyors can easily discharge grain at different positions, making them suitable for silo groups.

Fully enclosed structure

The closed design reduces dust leakage and protects grain from external contamination.

Space saving

They can be installed underground or inside steel structures.

Limitations

• Higher power consumption compared with belt conveyors
• More internal wear parts
• Not suitable for extremely long distances

Engineering Recommendation

For a grain storage center with multiple silos, scraper conveyors are often installed under silo outlets to collect and transfer grain efficiently.

4. Air Supported Belt Conveyor

Low Damage and Energy Saving Grain Transportation

Air supported belt conveyor is an advanced solution for large grain terminals and high-capacity storage facilities.

Instead of traditional rollers, the belt floats on an air cushion, reducing friction between belt and support structure.

Main Parameters

Advantages

Extremely low grain damage

The smooth belt movement reduces impact on grain particles.

Lower maintenance requirement

Fewer moving parts mean less mechanical wear.

Suitable for long-distance conveying

It is commonly used in:

• Port grain terminals
• Large grain warehouses
• High-capacity maize storage projects

Limitations

• Higher initial investment
• Requires stable power supply and air system maintenance

Engineering Recommendation

When customers require high throughput, low noise, and continuous operation, air-supported conveyors are usually a better choice than traditional belt conveyors.

5. Screw Conveyor for Grain Silo Discharge

Compact Equipment for Short Distance Transportation

Screw conveyor is commonly used for:

• Hopper bottom silo discharge
• Small storage systems
• Feeding processing equipment

Main Parameters

Advantages

• Compact structure
• Easy installation
• Good sealing performance

Limitations

• Higher grain friction
• Not recommended for large capacity long-distance transportation

6. Pneumatic Grain Conveying System

Fully Enclosed Solution for Special Applications

Pneumatic conveying uses airflow generated by blowers to transport grain through pipelines.

It is mainly used where traditional mechanical conveyors cannot be installed.

Main Parameters

Advantages

• Flexible pipeline layout
• Completely enclosed conveying
• Low risk of contamination

Limitations

• Higher energy consumption
• Not suitable for extremely large grain volumes

How to Select the Right Grain Conveyor System?

From our engineering experience, the correct conveying equipment depends on several factors.

1. According to Conveying Distance

2. According to Grain Type

3. According to Project Capacity

Small Grain Storage Project

Recommended:

• Bucket elevator
• Screw conveyor
• Small belt conveyor

Capacity:
50-500 tons/day

Medium Grain Storage Center

Recommended:

• Bucket elevator
• Belt conveyor
• Scraper conveyor
• Dust collection system

Capacity:
500-3000 tons/day

Large Grain Terminal

Recommended:

• High-capacity bucket elevator
• Air-supported belt conveyor
• Automatic control system
• Intelligent monitoring system

Capacity:
3000+ tons/day

COBAN Grain Silo Conveying System Design

Every grain storage project has different requirements. A standard conveyor layout cannot achieve the best performance for every customer.

Our engineering team designs the complete grain silo conveying system based on:

• Grain type and characteristics
• Required throughput
• Storage capacity
• Site layout
• Loading and unloading process
• Future expansion requirements

A complete COBAN grain handling system can integrate:

✓ Receiving system
✓ Cleaning system
✓ Drying system
✓ Grain silo storage
✓ Conveying equipment
✓ Dust collection system
✓ Automatic control system

Through reasonable equipment selection and layout design, customers can achieve higher efficiency, lower operating costs, and safer grain storage operation.

Build Your Grain Silo Conveying Solution with COBAN

Whether you are planning a new grain storage facility, expanding an existing silo project, or upgrading your grain handling system, COBAN can provide a complete conveying solution according to your actual production requirements.

Contact our engineering team to discuss your grain silo conveying system design, equipment selection, and project configuration.