Wedge Wire Sieve Bend Screen

I. Core Definition and Structural Features A Wedge Wire Sieve Bend Screen, commonly known as a wedge-shaped wire arc screen, is a highly efficient solid-liquid separation and grading device. Its core structure consists of a wedge-shaped wire screen and an arc-shaped support frame. Its unique structural design enables high-precision, high-capacity separation operations, and it is widely used in mining, water treatment, food processing, and other industrial fields. 

1. Key Structural Components Wedge-shaped Wire Screen: The screen body is made of metal wedge-shaped wires (triangular or trapezoidal cross-section) precision welded together, forming a V-shaped screen gap. The gap width can be customized (usually 0.1-10mm), featuring wear resistance, corrosion resistance, and non-clogging characteristics. The gap dimensions are stable, resulting in high separation accuracy. Arc-shaped Support Frame: The screen is fixed to an arc-shaped steel frame, forming a certain radius of curvature (common radius of curvature is 500-2000mm). The arc design allows the material to slide along the screen surface under gravity, generating centrifugal force and a secondary material distribution effect, improving separation efficiency. Feeding and Discharging Structure: The feed end is usually equipped with a buffer device (such as a feed weir) to prevent material from directly impacting the screen. The discharge end is divided into "oversize material outlet" (coarse particles that did not pass through the screen openings) and "undersize material outlet" (fine particles or liquid that passed through the screen openings). Some models can be equipped with a washing device to clean residual material on the screen surface. 

II. Working Principle The separation process of the wedge wire arc screen is based on the synergistic effect of gravity screening and centrifugal assistance. The specific process is as follows: Material Feeding: The solid-liquid mixture (or particle mixture) to be separated is evenly distributed in the upper feed area of the arc screen through the feeding device. The material slides down the arc screen surface at a certain speed. Screening Separation: During the sliding process, fine particles (or liquid) that meet the screen opening size are driven by gravity and the centrifugal force generated by the curvature of the screen surface, passing through the V-shaped screen openings and entering the "undersize material collection chamber"; while coarse particles, unable to pass through the screen openings, continue to slide along the screen surface to the "oversize material outlet" for discharge. Anti-clogging design: The "wider at the top and narrower at the bottom" structure of the V-shaped screen slots reduces material blockage. Simultaneously, the slight friction between the material sliding and the screen surface provides a self-cleaning effect. In some high-viscosity material scenarios, it can be combined with a high-frequency vibration device or spray system to further enhance the anti-clogging effect. 

III. Main Application Areas Due to its high separation efficiency, wear resistance, and low maintenance costs, the wedge wire arc screen is widely used in various industrial scenarios. Core application areas include: 

1. Mining and Metallurgical Industry Mineral Classification: In the beneficiation processes of gold, copper, and iron mines, it is used for pre-classification of raw ore (e.g., removing coarse particle impurities), post-grinding classification (controlling grinding particle size), or tailings dewatering (recovering fine particle minerals and reducing wastewater discharge). Coal Slurry Dewatering: In the coal washing process, it is used for solid-liquid separation of coal slurry water. The separated fine coal slurry can be recycled, and the clean water is circulated back to the coal washing system, reducing water consumption. 

2. Water Treatment Industry

Municipal Wastewater Pretreatment: Used at the upstream of wastewater treatment plants to remove suspended particulate matter (such as silt and fiber) from wastewater, reducing the load on subsequent biological treatment systems.

Industrial Wastewater Treatment: For wastewater from industries such as chemical, printing and dyeing, and papermaking, it separates solid impurities (such as dye residue and pulp fiber), improving wastewater reuse rates or reducing the difficulty of achieving treatment standards.

Rainwater Harvesting Systems: Used for filtration during rainwater collection, removing impurities such as fallen leaves and silt, ensuring the cleanliness of the harvested rainwater.

3. Food and Pharmaceutical Industry

Food Processing: Used as a high-precision screening device in starch processing (separating starch and fiber), juice filtration (removing fruit pulp residue), and sugar refining (separating sugar juice and sugar residue) to ensure product purity.

Pharmaceutical Production: Used for filtration of traditional Chinese medicine extracts (removing medicinal residue) and solid-liquid separation of fermentation broths (separating bacterial cells and supernatant), meeting food-grade and pharmaceutical-grade hygiene standards (usually made of 304/316L stainless steel). 4. Environmental Protection and Solid Waste Treatment

Leachate Treatment: In landfill leachate treatment, it separates suspended solids and impurities, providing pretreatment for subsequent membrane or biochemical treatment.

Sludge Dewatering: Used for pretreatment and dewatering of municipal or industrial sludge, reducing sludge moisture content and decreasing energy consumption for subsequent drying or incineration.

IV. Core Advantages

Compared to traditional woven wire screens, perforated screens, and other separation equipment, the Wedge Wire Sieve Bend Screen has the following significant advantages:

High and Stable Separation Accuracy: The precision welding process of the wedge wires ensures that the screen gap size error is ≤0.05mm, the separation accuracy can be controlled within 0.1-10mm, and the screen gap is not easily enlarged due to wear, maintaining stable accuracy even after long-term use. High throughput and high efficiency: The arc-shaped structure expands the effective screening area, while the material sliding speed is fast (usually 0.5-1.5m/s), resulting in a 30%-50% higher throughput per unit time compared to traditional flat screens, making it suitable for high-flow-rate applications. Wear-resistant and corrosion-resistant, long service life: The screen material is mostly made of 304 stainless steel, 316L stainless steel, or special alloys (such as Hastelloy), which can withstand acid and alkali corrosion, high temperatures (up to 400℃), and material abrasion, with a service life of 1-3 years, far exceeding that of woven screens (usually 3-6 months). Low maintenance cost and easy operation: The non-clogging structure reduces the frequency of cleaning; daily maintenance only requires periodic checks of screen wear and frame tightness. The equipment has no complex moving parts, resulting in a low failure rate, and no professional skills training is required for operation.