Tongli drum screen is a widely used machine in sorting technology. It controls the fertilizer sorting by the particle size, and has high sorting accuracy. The drum screen is generally divided into several sections, depending on the specific situation. The screen holes are arranged from small to large, and the screen holes on each section have the same diameter. The screen hole diameter of the drum screen can be customized according to the material characteristics and screening requirements, usually between 5 and 50 mm, and the screening efficiency can reach 60-85%. It has the characteristics of simple structure, easy maintenance, and stable operation. The processing capacity can reach 50 to 150 tons per hour, and it is suitable for screening operations of various materials.
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Tongli drum screen is equipped with a plate-type cleaning mechanism. The relative movement between the cleaning machine and the screen body can effectively prevent the screen from being blocked. The design prevents dust from flying in the sealed dust cover. The noise generated by the operation is isolated by the sealed dust cover. It is equipped with multi-layer screens to improve the screening accuracy.
The drum screen adopts a spiral guide structure, which can handle materials with a moisture content of up to 30% and effectively prevent blockage. For wet sticky coal screening, the screening efficiency can be increased to more than 85%, ensuring that the material is evenly distributed in the screen drum and improving the overall production capacity.
The drum screen is equipped with multiple sections of replaceable screens, with a maximum screening diameter of up to 150 mm, to achieve flexible adjustment of particle size classification. By combining screens with different apertures, the classification accuracy can be increased to 95%, which is particularly suitable for fine screening of ores and sand and gravel.
The drum screen supports a variety of feeding methods, including belt conveyor and vibrating feeding, to meet the needs of different production lines. By optimizing the feeding scheme, the screening efficiency is increased by about 30%, meeting various material handling requirements. The flexible feeding design allows for quick adjustment of the input flow rate, ensuring the smoothness and continuity of the screening process, improving production efficiency, and adapting to the changing needs of different industrial application scenarios.
Specification | Drum Diameter (mm) | Length (mm) | Speed (r/min) | Inclination (°) | Power (kW) | Capacity (t/h) | Dimensions (L×W×H) (m) | Weight (t) |
GS1.0×3.0 | 1000 | 3000 | 22 | 2-2.5 | 2.2 | 1~3 | 3.5×1.4×2.2 | 1.5 |
GS1.2×4.0 | 1200 | 4000 | 16 | 2-2.5 | 4 | 3~5 | 5.2×0.6×2.4 | 2.3 |
GS1.2×4.5 | 1200 | 4500 | 17 | 2-2.5 | 4 | 5~7 | 5.7×1.6×2.4 | 2.5 |
GS1.5×5.0 | 1500 | 5000 | 14 | 2-2.5 | 4 | 16~24 | 6.9×1.9×3.0 | 3.8 |
GS1.6×6.0 | 1600 | 6000 | 12 | 2-2.5 | 11 | 50~70 | 7.3×2.0×3.0 | 4.7 |
GS1.8×6.5 | 1800 | 6500 | 11.5 | 2-2.5 | 11 | 50~70 | 9.0×2.2×3.2 | 6 |
A trommel screen is a cylindrical screening device primarily used for the classification and separation of solid materials. Its working principle involves using a rotating drum and gravity to separate materials by size.
The drum typically rotates slowly at a speed of 3-8 RPM with an inclination of 3-5 degrees. Material enters from the higher end of the drum, and during rotation, particles smaller than the screen openings fall through while larger particles exit from the lower end.
Trommel screens can handle material sizes ranging from 0.074mm to 300mm, making them suitable for various industries such as ore, coal, and building materials.
The screening efficiency of a trommel screen typically ranges from 85% to 95%, depending on several factors. Key factors include:
1、Drum speed, usually 30%-40% of critical speed; too fast or too slow can decrease efficiency.
2、Drum inclination, typically 3-5 degrees; a steep angle can cause materials to slide too quickly.
3、Feed rate, ideally 70%-80% of design capacity.
Material characteristics like moisture and stickiness also affect screening performance. Screen hole shape and size should be chosen based on material characteristics. The drum length-to-diameter ratio is generally 1.5:1 to 3:1. Optimizing these parameters can significantly improve screening efficiency.
Trommel screens have distinct advantages and disadvantages compared to vibrating screens:
Advantages include a large capacity, with large trommel screens handling over 1000 tons/hour, 2-3 times more than similarly sized vibrating screens. They offer stable operation with less vibration and noise (usually below 80dB), suitable for continuous operation.
They also have a long lifespan, with key components lasting 5-10 years, 30%-50% longer than vibrating screens, and low energy consumption, using about 0.1-0.3 kWh per ton, 20%-40% lower than vibrating screens.
Disadvantages include a large footprint, over 10 meters long, occupying 30%-50% more space than vibrating screens, and high initial investment, with purchase costs 20%-30% higher than vibrating screens of equivalent capacity. They also have slightly lower screening precision, potentially 5%-10% less precise for fine materials, and are not suitable for sticky, wet materials, which can easily cause screen clogging.
The screening precision of a trommel screen typically ranges from 80% to 95%, depending on material characteristics and operational parameters. Methods to improve precision include:
1、Optimizing screen selection: Choose screens with appropriate aperture and open area to improve precision by 5%-10%.
2、Adjusting speed: Usually controlled at 30%-40% of critical speed, enhancing precision by 3%-5%.
Proper inclination, generally 3-5 degrees, can increase precision by 2%-4%. Controlling feed rate, keeping it at 70%-80% of design capacity, can boost precision by 5%-8%. Multistage screening, adding stages can improve overall precision by 3%-5% per stage. Using cleaning devices prevents screen clogging, increasing precision by 4%-6%. Controlling material moisture, keeping it at an appropriate level (usually 10%-15%), raises precision by 3%-5%. Optimizing drum length, increasing length by 10%-20%, enhances precision by 2%-3%. By applying these methods comprehensively, trommel screen precision can be improved to 90%-98%.
Trommel screens primarily offer the following types:
1、Wire mesh: Suitable for 5-100mm particles, with an open area of 50%-60%.
2、Perforated plate: Suitable for 10-300mm particles, with an open area of 40%-50%.
3、Polyurethane screen: Suitable for 1-50mm particles, with a lifespan 3-5 times longer than wire mesh.
Rubber screen: Suitable for 5-100mm particles, low noise, suitable for wet screening. When selecting a screen, consider particle size, with screen openings typically 1.2-1.5 times the target size. Material characteristics like hardness and corrosion resistance are also important. Screening efficiency, with higher open area increasing efficiency but reducing strength. Lifespan, with polyurethane screens lasting the longest, up to 5000-8000 hours. Cost, with wire mesh being most economical but having a shorter lifespan, about 1000-2000 hours. By considering these factors comprehensively, the most suitable screen type can be selected.
Regular maintenance of a trommel screen is crucial for ensuring its longevity and optimal performance. Key maintenance practices include:
1、Routine Inspection:
Regularly inspect the drum, motor, and other components for wear and tear. Check for any signs of damage or unusual noise during operation.
2、Cleaning and Lubrication:
Clean the screen and other parts periodically to prevent material buildup that can lead to clogging. Ensure all moving parts are properly lubricated to reduce friction and wear.
3、Component Replacement:
Timely replace worn-out parts such as screens and bearings to prevent further damage and maintain efficiency. Use high-quality replacement parts to ensure durability.
By adhering to these maintenance practices, you can significantly extend the lifespan of a trommel screen and maintain its efficiency.
The drum screen is used to screen particles in the production of NPK compound fertilizer, separating particles that meet the specifications from particles that are too large or too small, ensuring that the particle size of the finished fertilizer is uniform
Potassium nitrate particles are screened through a drum screen during the production process to ensure consistent particle size, avoid agglomeration and dust, improve product quality, and ensure the stability of the fertilizer during storage and application.
In the production process of BB fertilizer, the drum screen is used to remove oversized or agglomerated particles to ensure that the fertilizer particles after mixing are uniform. After screening, BB fertilizer can better meet the application needs.
The drum screen is used to screen out particles that meet the requirements in the organic fertilizer production line, and at the same time separate unformed or oversized particles, which helps to improve the uniformity and quality of organic fertilizer.
In the production of diammonium phosphate, the drum screen can be used to screen qualified particles, remove powder and oversized particles, ensure the quality of the finished product, and facilitate subsequent packaging and application.
Single fertilizers such as ammonium sulfate and potassium chloride use drum screens in production to remove particles that do not meet the standards, ensure the uniformity and consistency of fertilizer particles, and improve the application effect.
The drum screen is used to screen out particles that meet the specifications in the production of slow-release fertilizer, ensuring that the nutrient release of each batch of fertilizer is uniform and consistent, and improving its application effect and market value.
Bio-organic fertilizer is screened through a drum screen after production to remove unformed or broken particles, maintain the stability and consistency of the finished product, and improve the effect of the fertilizer in application.
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