Double deck horizontal screens are a type of vibrating screen commonly used in industries such as mining, aggregate processing, and recycling for the efficient screening and classification of bulk materials. 

Double Deck Horizontal Screens Features

Two Screen Decks: As the name suggests, double deck horizontal screens feature two screen decks stacked horizontally one above the other. Each deck consists of screen panels with different opening sizes or mesh sizes to classify materials into multiple size fractions simultaneously.

Horizontal Motion: Unlike inclined or banana screens, which feature a sloped or curved deck profile, double deck horizontal screens have a flat horizontal deck orientation. The screen decks move in a horizontal motion, imparted by the vibration mechanism, to facilitate efficient material movement and screening.

Vibration Mechanism: Double deck horizontal screens are equipped with a vibration mechanism to generate the necessary motion for screening. This typically consists of an eccentric shaft with unbalanced weights or flywheels attached to it. When the motor rotates the shaft, it generates horizontal vibration that is transferred to the screen decks.

High Capacity Screening: Double deck horizontal screens are designed for high-capacity screening applications where large volumes of material need to be processed efficiently. The two decks provide increased screening area compared to single deck screens, allowing for higher throughput capacity and improved screening efficiency.

Scalping and Pre-Screening: Double deck horizontal screens are commonly used for scalping or pre-screening purposes to remove oversized particles or contaminants from the feed material. The top deck acts as a scalping screen, while the bottom deck further classifies the material into finer size fractions.

Fine Particle Classification: In addition to scalping, double deck horizontal screens can be used for fine particle classification. The bottom deck typically features finer mesh panels to separate smaller particles from larger ones, resulting in precise particle size classification and improved product quality.

Dewatering: Some double deck horizontal screens may be used for dewatering purposes to remove excess moisture from wet materials or slurry streams. The horizontal motion of the screen decks helps to promote efficient drainage of water from the solids, resulting in drier material for further processing or disposal.

Versatility: Double deck horizontal screens are versatile and can be used for a wide range of applications, including screening of aggregates, coal, iron ore, and other bulk materials. They are suitable for dry or wet screening operations and can handle various feed sizes and types of material.

Double Deck Horizontal Screens Working Principle

Double deck horizontal screens are a type of vibrating screen used in various industries for the screening and classification of bulk materials. They consist of two decks, each containing a series of screen panels or decks arranged horizontally. 

Horizontal Arrangement: As the name suggests, double deck horizontal screens have a horizontal deck arrangement. The screen decks are typically mounted on a robust frame and arranged parallel to the ground.

Vibration Mechanism: Double deck horizontal screens are equipped with a vibration mechanism that generates vibratory motion to the screen decks. This vibration mechanism typically consists of an eccentric shaft with unbalanced weights or flywheels attached to it. When the motor rotates the shaft, it generates vibration that is transferred to the screen decks, causing them to oscillate horizontally.

Material Feed: Bulk materials are fed onto the top deck of the horizontal screen using a conveyor belt, chute, or other feeding mechanism. The material spreads out evenly across the width of the screen deck as it travels along the length of the deck.

Screening Process: As the material moves across the screen deck, smaller particles pass through the openings in the screen panels, while larger particles are retained on the screen surface. This separation process effectively classifies the material into different size fractions. The material that passes through the top deck is then screened again on the bottom deck, further refining the size distribution.

Adjustability: Operators can adjust various parameters of double deck horizontal screens, such as the amplitude and frequency of vibration, to optimize the screening process for different types of materials and desired screening efficiency. They can also adjust the angle of inclination of the screen decks to control the material flow and screening performance.

Screen Panels: The screen decks of double deck horizontal screens are typically fitted with screen panels made of various materials such as wire mesh, polyurethane, or rubber. These screen panels have openings or perforations of different sizes to allow for the passage of particles smaller than the opening size while retaining larger particles on the screen surface.

Scalping and Sizing: Double deck horizontal screens can be used for both scalping and sizing applications. The top deck acts as a scalping screen, removing oversized particles or contaminants from the feed material, while the bottom deck further sizes the material into different size fractions.

Versatility: Double deck horizontal screens are versatile and can be used for a wide range of applications, including screening of aggregates, minerals, coal, and other bulk materials. They are suitable for dry or wet screening operations and can handle various feed sizes and types of material.