The low screening efficiency of circular tumbler screens manifests in various ways: material clogging of the mesh, insufficient screening rate, and unreasonable material residence time on the screen surface. To systematically solve these problems, it is first necessary to understand the core factors affecting efficiency and their mechanisms of action.

I. Material Characteristics are the Primary Factor Leading to Low Screening Efficiency

When materials possess characteristics such as strong adsorption, easy agglomeration, high static electricity, and high fineness, they are extremely prone to clogging the mesh, significantly reducing work efficiency and screening effect. When the moisture content exceeds 5%, fine particles agglomerate together, adhering to larger particles and clogging the screen mesh, making the screening process difficult. Furthermore, a large number of particles near the screening point, irregular flakes, or spheres—material forms with multiple contact points with the screen mesh—will all result in slow feeding and easy screen clogging due to their inherent properties.

II. Equipment Condition and Operating Methods Are Also Crucial

Excessive feeding speed or excessive feeding volume will lead to excessive material accumulation on the screen surface and a sharp decrease in screening rate. Meanwhile, insufficient screen tension can cause irregular vibration responses between the screen and the support beam, creating screening "blind spots" and significantly increasing the retention rate of fine materials. Problems such as eccentric shaft wear and poor screen frame sealing can lead to uneven vibration, resulting in significant fluctuations in screening accuracy.

Solution Strategies 

To address the above problems, solutions should be implemented in stages. For screen clogging caused by the material's inherent properties, the most effective method is to install a screen cleaning device. Choose the appropriate cleaning method based on the material characteristics: ultrasonic cleaning is recommended for lightweight, high-fineness powders; bouncing ball cleaning can be used for large particles (60 or 80 mesh or larger); and brush cleaning is often used for slurry-like materials. For materials with excessively high moisture content, if the moisture content is between 5% and 8%, the material should be dried as much as possible. If drying is not possible, the probability of clogging can be reduced by adjusting the screen tension to induce slight secondary vibration between the screen and the support beam—specifically, the tension hook can be made into a constant-force tensioning mechanism, and a spring can be added to the tension bolt. If the material moisture content exceeds 8%, wet screening should be used. For inefficiencies caused by improper feeding, it is recommended to reduce the amount of material fed at a time, adopt a uniform feeding speed, or install a buffer hopper and quantitative feeding device at the feed inlet.

Improving the screening efficiency of a circular tumbler screen is a systematic project involving multiple aspects such as material pretreatment, equipment parameter optimization, selection of screen cleaning devices, and adherence to operating procedures. While screen clogging is the most direct manifestation of inefficiency, it is often the result of a combination of factors. Only by identifying the root causes of the problem and taking targeted comprehensive measures can users restore the screening efficiency of the gyratory screen to its design level, truly achieving the production goal of "precise screening and high-efficiency output."

Clearly separated particles, intelligent screening – Mirant Xinxiang Machinery Equipment Co., Ltd.