BRL Series Banana Screen for High-Capacity and Constant Bed Thickness Screening

The BRL Series Banana Screen, also known as a constant bed thickness screen, is a high-performance screening equipment developed to meet the increasing demands for large capacity, high efficiency, and stable screening accuracy in modern mining and processing plants. It is named after its distinctive “banana-shaped” profile, formed by multiple screen deck sections installed at different inclination angles.

The core design concept of the BRL Series is constant bed thickness screening. Unlike conventional linear vibrating screens, where the material bed is thick at the feed end and gradually becomes thinner toward the discharge end, the banana screen maintains a relatively uniform material bed thickness along the entire screening surface. This is achieved through a progressive reduction of deck inclination angles combined with optimized vibration parameters.

At the feed end, the steep inclination allows material to accelerate rapidly, preventing excessive accumulation and overloading of the screen surface. As the material moves forward, the inclination angle decreases step by step, reducing conveying speed and allowing sufficient residence time for fine particles to pass through the apertures. This progressive transport behavior ensures optimal screening conditions across all deck sections, significantly improving screening efficiency and unit-area processing capacity.

As a result, the BRL Series Banana Screen has become the preferred solution for handling high-throughput, medium-to-fine particle size screening tasks in large-scale mining operations, aggregate production lines, and coal preparation plants.

Multi-Section Variable-Angle Screen Box

The multi-section screen box is the defining feature of the banana screen. It typically consists of 3 to 5 screen deck sections, each installed at a different inclination angle. From the feed end to the discharge end, the angles decrease progressively (for example: 35°, 25°, 15°, and 5°). The overall contour forms a curved, banana-like shape that enables constant bed thickness screening.

High-Strength Screen Box and Cross Beams

The screen box is manufactured using box-type beams or high-strength structural steel sections. Welded construction ensures high rigidity and fatigue resistance under strong inertial forces generated during high-intensity vibration. This design supports long service life under continuous heavy-duty operation.

Dual Vibration Motors or Exciters

The vibration system typically consists of dual vibration motors or block-type eccentric exciters that generate strong linear excitation force. The vibration intensity (G-force) can be adjusted to suit different material characteristics, particle sizes, and moisture content.

High-Performance Screening Media

The BRL Series commonly adopts polyurethane elastic screen panels or heavy-duty welded wire screens. The modular design allows individual deck sections to be replaced independently, reducing downtime and maintenance cost. Aperture shapes and sizes can be customized according to application requirements.

Vibration Isolation and Support System

Composite springs or rubber springs are used to support the screen box and isolate vibration from the foundation. This system effectively reduces dynamic loads transmitted to surrounding structures and improves operational stability.

Segmented Feed Box and Dust-Proof Enclosure

A segmented feed box ensures even material distribution onto the first screen deck. Optional fully enclosed dust covers provide effective dust control, meeting environmental protection requirements in modern industrial plants.

Ferrous and Non-Ferrous Mining

The BRL Series Banana Screen is widely used for pre-screening ahead of closed-circuit grinding systems. By removing qualified fine particles from crushed products, it significantly improves grinding mill efficiency. It is also applied in concentrate and tailings dewatering operations.

Large-Scale Aggregate Production Lines

In sand and aggregate plants, the banana screen is commonly used for final grading of manufactured sand and aggregates, such as separating 0–3 mm, 3–5 mm, and 5–10 mm fractions. Its extremely high throughput makes it ideal for large-capacity production lines.

Coal Preparation and Washing Plants (Core Application)

The BRL Series plays a critical role in modern coal preparation plants. It is used for raw coal sizing (e.g., 300×300 mm, 100×100 mm, 50×50 mm, 25×25 mm classifications), as well as for desliming and dewatering after dense medium separation. Its ability to handle large volumes reliably makes it a key equipment in coal washing systems.

Chemical and Industrial Minerals

The banana screen is also suitable for particle size classification of bulk materials such as fertilizers, quartz sand, salt, and other industrial minerals produced at large scale.

Extremely High Processing Capacity

The most significant advantage of the BRL Series Banana Screen is its outstanding capacity. The unit-width throughput can reach 1.5 to 2.5 times that of conventional linear vibrating screens. Under the same installation space and capacity requirements, fewer machines or smaller models are needed.

Stable Screening Accuracy and Product Consistency

Constant bed thickness screening minimizes near-mesh effects and reduces screen blinding. This results in stable screening accuracy and consistent product size distribution.

Excellent Adaptability to Difficult Materials

The BRL Series performs particularly well when handling materials with higher moisture content or higher fine particle ratios. Its anti-blinding and anti-sticking capability is superior to conventional screens, ensuring stable long-term operation.

Robust Structure and High Reliability

Designed for heavy-duty applications, the equipment features reinforced structures, heavy-load bearings, and wear-resistant components. It is suitable for 24/7 continuous operation in harsh industrial environments.

Energy Efficiency per Ton of Material

Although the installed power of a single machine may be relatively high, the exceptionally high screening efficiency means that energy consumption per ton of processed material is typically lower than that of conventional screening equipment.