What is Banana Sieve

Banana sieve is a new type of screening equipment, named because its screen box is shaped like a banana. Its screen surface is composed of multiple sections of broken lines with different inclination angles, with a large slope at the feed end and a small slope at the discharge end. With this unique design, the material can be efficiently screened on the screen surface, with a large processing capacity, which can be 1-2 times higher than the processing capacity of the vibrating screen with the same effective area. And the screening efficiency is high, usually greater than 95%.

This equipment is suitable for a variety of materials, especially for large and medium-sized materials with high fine particle content, such as coal, ore, sand and gravel. It can also be used in metal mines, building materials and other industries to meet the screening needs of large-volume mining operations.

The difference between banana sieve and traditional linear vibrating screen

Banana screen: It is usually composed of 2-6 sections of screen surfaces with different inclinations, gradually transitioning from the steep angle at the feed end (such as 30°-45°) to the gentle angle at the discharge end (such as 0°-10°). In the steep section, the material flow rate is fast, the layer thickness is thin, and the fine material is quickly layered and screened out; in the gentle section, the material flow rate slows down, increasing the chance of particle penetration.

Applicable particle size range: mostly medium and coarse particles (0.1~150mm) material screening

Screening efficiency: high, 1.5-2 times higher efficiency than traditional screens, and large processing capacity per unit area (up to 2500 tons/hour).

Processing capacity: Very high: Under the same screening area, the processing capacity is usually 1.5-2 times higher than that of traditional screens, or even more.

Traditional linear vibrating screen: The screen surface is usually straight, the whole is horizontal or has a fixed inclination angle (such as 5°-25°). The screen surface is usually straight, the whole is horizontal or has a fixed inclination angle (such as 5°-25°).

Applicable particle size range: It can be used for coarse, medium and fine particle screening, but the efficiency is low

Screening efficiency: Low, limited processing capacity, suitable for small and medium-sized production.

Processing capacity: Relatively low, when processing large processing capacity, a larger screening area is required.

What is the working principle of the banana sieve

The motor and the exciter are used as vibration sources. The two sets of eccentric masses in the exciter are equal and run synchronously in the opposite direction. At each instantaneous position, the centrifugal force generated by the two sets of eccentric masses always superimposes on each other along the vibration direction to form a single-direction excitation force, so that the screen box reciprocates linearly. The screen surface relies on linear movement in both horizontal and vertical directions to achieve forward and backward movement and screening of materials, so that the materials are continuously layered and screened during the vibration process.

What are the advantages of banana sieve?

The banana sieve adopts a large vibration intensity and a unique screen surface design, which makes the material move fast on the screen surface and pass a large amount of material. It can meet the screening needs of large amounts of materials and increase the processing capacity by 1-2 times compared with the vibrating screen with the same effective area. The ratio of material quantity to flow rate on each section of the screen is stable, the material layer height is uniform, fine-grained materials can be screened faster, and the screening efficiency is significantly improved, usually the screening efficiency can be greater than 95%.

Recommended mesh number of banana sieve

The actual mesh selection should be determined based on the material particle size distribution, processing capacity, screening purpose (classification/dehydration/desludging) and equipment model; banana sieves are mostly used for coarse screening or medium-coarse screening processes, and banana sieves are rarely used for fine screening (above 100 mesh).

What can banana sieves be used for

Banana screens are widely used for screening and processing of heavy-loaded and high-yield materials because of their multi-section curved screen surface, large processing capacity and screening efficiency.

In coal mine washing systems, banana sieves are often used to pre-screen raw coal, separate large pieces of coal, impurities and coal slime, and reduce the burden on subsequent equipment. It is also commonly used in coal slime dehydration or de-mediuming processes. The curved screen surface allows the coal slime to be quickly layered to improve screening efficiency.

In the beneficiation processes of iron ore, manganese ore, lead and zinc ore, banana sieves are used for pre-screening before coarse or medium crushing, effectively separating qualified particle sizes, improving crusher processing efficiency, and reducing energy consumption. Banana screens are also suitable for fine grading and particle size control of aggregates such as machine-made sand and gravel. Because of its large processing capacity and clear screening levels, it is often used in large aggregate production lines to control the particle size of finished materials and improve product consistency.

In the steel smelting process, sintered ore and pelletized ore need to be screened according to particle size after cooling. Banana screens can achieve large-throughput grading under high-speed vibration to ensure uniform and stable charge. Power plant boilers have strict requirements on coal powder particle size. Banana screens are used for screening before boiler coal combustion to screen out unqualified particles.