The drum screen can screen compost by rotating and relying on the principle of gravity.
Basic Composition
Basic Composition
It mainly consists of a drum, a driving device, a supporting device, and a screening device. The drum is its core component, generally cylindrical in shape, made of metal materials such as stainless steel or carbon steel, with certain strength and corrosion resistance to adapt to composting environments. The two ends of the drum are usually equipped with bearings, which are fixed by support devices to enable it to rotate around the axis.
The driving device includes motors, reducers, and transmission chains or gears. The motor provides power, the reducer is used to adjust the speed of the drum, and the transmission components transmit power to the drum, allowing it to rotate at an appropriate speed. The rotational speed can usually be adjusted according to the actual characteristics of compost materials and screening requirements, generally ranging from a few to tens of revolutions per minute.
The screening device is installed inside the drum and is commonly composed of screens with different aperture sizes. The aperture size of the sieve is selected according to the particle requirements of the compost product. For example, fine compost used for flower planting may require a smaller aperture sieve (such as a few millimeters), while compost used for general soil improvement can use a larger aperture sieve (such as a dozen millimeters).
2. Working principle
After the compost material is fed into the drum screen, it continuously rolls and stirs inside the drum as it rotates. During this process, compost particles smaller than the sieve aperture will fall through the sieve and be collected as qualified compost products. And debris larger than the sieve aperture (such as large organic matter, stones, plastic fragments, etc. that have not been completely decomposed) will gradually move towards the other end of the drum as the drum rotates, and eventually be discharged from the drum screen as screened material for further processing.
This rolling method is similar to the flipping process during manual screening, but achieves continuous and efficient screening through mechanical rotation. Moreover, the rotation of the drum can further loosen the material during the screening process, which helps to improve the efficiency and accuracy of screening.
3. Function in composting
Improving compost quality: By removing large impurities and incompletely decomposed materials from compost, the particles can be made more uniform and delicate, and the distribution of nutrients can be more reasonable. This type of compost applied to soil can better improve soil structure, enhance soil aeration, water retention, and other properties, which is beneficial for the growth of plant roots.
Improve production efficiency: Compared to traditional manual screening methods, composting drum screens can achieve automated and continuous screening operations. It can process a large amount of compost materials in a short period of time, greatly improving the production speed of compost and meeting the needs of large-scale compost production.
4. Application scenarios
It is widely used in organic waste composting plants, including the composting process of organic parts in urban household waste (such as kitchen waste) and agricultural waste (such as crop straw and livestock manure). In these scenarios, the composting drum screen can effectively screen the semi-finished compost products, improve the quality of compost, and make it meet the requirements of various agricultural, horticultural and other fields.