2026/07/11
Currently, the most widely used screening machines in the industrial field are drum screens and vibrating screens, which differ significantly in their structural principles and applicable scenarios. The main body of a drum screen is an inclined polygonal or circular screen cylinder with a screen mesh laid around the cylinder wall. As the cylinder rotates, the material tumbles and slides inside. Fine particles pass through the screen holes and fall into the hopper below, while coarse particles are discharged towards the end along the spiral guide plate inside the cylinder. This machine model is highly adaptable to various materials. Even with a moisture content as high as 8% and a certain amount of fiber, the drum screen maintains stable screening efficiency and is not prone to clogging, making it a standard choice for organic fertilizer production lines. The vibrating screen relies on high-frequency reciprocating vibration generated by the vibrator, causing the material to jump across the screen surface. Particles repeatedly contact the screen openings during the throwing process, achieving high-precision grading. The screening efficiency of the vibrating screen can reach over 95%, and the grading particle size can be quickly adjusted by changing screens with different aperture sizes, making it particularly suitable for NPK compound fertilizer production lines with strict particle size requirements. Regarding screen material, high-quality screens generally use high-manganese steel wire woven mesh or stainless steel perforated plates. The former has good wear resistance and impact resistance, while the latter is corrosion-resistant and not easily deformed.
The processing capacity of a screening machine mainly depends on the effective screen area and vibration frequency. For a production line with a capacity of 10 tons per hour, a dual-screen structure is usually required to distribute the load and increase the screening area. It is worth noting that screen clogging during screening severely impacts continuous operation rates. Modern designs, by adding elastic ball screen cleaning devices or ultrasonic self-cleaning systems, can significantly alleviate fine powder adhesion. Furthermore, the sealing of the screening machine's inlet and outlet directly affects workshop dust concentration; a well-designed negative pressure exhaust port can control dust emissions within environmental standards. From the perspective of overall material balance, large particles separated by the screening machine are crushed and returned to the granulator along with fine powder for re-granulation. This closed-loop cycle significantly reduces raw material waste, while the uniformity of the particle size of the qualified finished product directly improves the marketability of packaged products, making the screening machine a true quality gatekeeper.