The core working principle of a polyurethane high-frequency screen lies in the interplay between high-frequency vibration and the elasticity of the polyurethane material, thereby achieving highly efficient screening. The screening machine typically generates high-frequency vibrations-generally ranging from several hundred to several thousand Hertz-through exciters or motors mounted on the screen body. While the amplitude of this vibration is relatively small, the vibration velocity is high. These vibrations are transmitted through the screen mesh to the material, causing the material to exhibit a continuous, rapid state of bouncing, rolling, and flowing across the screen surface, thereby preventing material stagnation and clogging on the screen deck.
Polyurethane material possesses excellent elasticity and resilience; under the influence of high-frequency vibration, it provides a distinct "spring effect" that induces minute bouncing motions in the material resting on the screen apertures. Driven by this vibration and bouncing action, fine particles are easily agitated and shaken through the screen apertures, whereas larger particles remain on the screen surface due to their inertia and size constraints, thereby achieving the classification and separation of the material. Concurrently, the inherent flexibility of polyurethane helps mitigate impact damage to the material caused by vibration-a feature of particular importance when processing brittle or fragile substances.
The parameters of the high-frequency vibration can be precisely adjusted to suit the specific properties of the material being processed. For fine powders or lightweight particles, the vibration frequency and screen inclination angle can be appropriately increased to maximize the frequency of contact between the particles and the screen surface, thereby enhancing screening efficiency. Conversely, for heavy or wet and sticky materials, adjustments to the vibration amplitude and screen slope can facilitate the uniform spreading of the material across the screen surface, effectively minimizing agglomeration and aperture clogging. Through such precise control of these vibration parameters, the polyurethane high-frequency screen is capable of achieving not only high-precision screening but also sustained, stable operation over extended periods, thereby successfully balancing both throughput volume and screening quality.
