Heavy Duty Screening Equipment

Screening is the process of separating ore on screening machinery into different granularity levels, including those smaller and larger than the screen openings. It's a crucial aspect of ore processing operations. The ore to be screened is a mixture of various sized ores. The portion smaller than the discharge of the crushing machine can be screened out before crushing, known as pre-screening. This pre-screening of finer particles enhances the processing capacity of the crushing machine. After being crushed by the crushing machine, the ore undergoes screening, known as inspection screening. In closed-circuit crushing operations, finer particles smaller than the screen openings can be screened out, while coarser particles are returned to the screening machinery after being crushed by the crushing machine. This is referred to as pre-inspection screening. Pre-screening, inspection screening, and pre-inspection screening are the terms used.

Commonly used Heavy duty screening equipment includes Linear screens, banana screens, flip flow screen and stretched screens, among others.

1) Linear screens are suitable for the screening, classification, and dewatering of various minerals. They are primarily used for processes such as separating coarse-grained materials, and dry tailings disposal in mineral processing.

2) Banana screens are primarily suitable for dry and wet classification of various materials. In domestic metal mines, banana screens are commonly used for mid-to-fine crushing closed-circuit screening and high-pressure roller closed-circuit screening. They are a type of screening equipment that employs a combination of screen surfaces to distribute materials in an evenly thick manner across each screen surface from the feed end. The structure involves using combined screen surfaces, altering the incline angles of different sections of the screen surface to achieve varying throwing accelerations.

The equal-thickness screening method was introduced by E. Burstlein of France in 1972. In this method, the first section of the equal-thickness screen has a steeper incline, resulting in a high material flow rate. This section acts to cleanse the screen surface and is well-suited for processing raw coal with high moisture content. Subsequent sections have gradually decreasing inclines.

The main components of a banana screen include the screen frame, screen surface, vibrator, vibration damping support device, and motor drive unit.

3) The flip flow screen is mainly used for dry screening operations of fine, adhesive, and wet difficult-to-screen materials. It is primarily employed in high-pressure grinding roll closed-circuit classification operations. This type of screening equipment achieves material classification through the periodic relaxation and tensioning movement of the screen mesh.

The flip flow screen mainly consists of a screen frame, screen mesh, vibration exciter, and vibration damping system. When the screening machine is started, the eccentric block undergoes circular motion to generate basic vibration. After a certain period, the system enters a steady-state forced vibration stage, and the stretched screen transitions into its normal working process.

Relative motion occurs between the fixed screen frame and the floating screen frame's crossbeams, causing continuous relaxation and tension movements of the polyester screen mesh installed on the crossbeams.

The design concept of the flip flow screen was introduced by A. Wehnner, a German, in 1951. He incorporated the design principles of inner and outer screen frames into the dual-mass vibration feeder, laying the foundation for the design of the flip flow screen. The flip flow screen's mesh is made from a flexible polyurethane elastic material. During operation, the stretched screen undergoes periodic relaxation and tensioning movements, causing the screen surface to bend and deform, which in turn causes the screen openings to change shape. This design feature prompts materials to not only slide along the screen surface but also experience a forward bouncing motion, making it well-suited for screening sticky, wet, and fine-grained materials. Due to the reciprocating bending motion of the elastic screen surface, the amplitude and acceleration of the flip flow screen are much greater than those of traditional screening machinery that uses rigid flat screens. With the introduction of durable and highly elastic polyurethane screen mesh materials, the flip flow screen technology has rapidly advanced.

4) In order to improve the safety and stability of the screening machine, the company's R&D team has developed a reliable intelligent control system, which is a comprehensive and scientific application of interne of “thinas bia “data cloud computing vibrating screen detection technologies.