Dual‑Shaft Screw Conveyor (Twin Auger / Double Screw Feeder)

Product Overview

Our dual‑shaft screw conveyor, also known as twin auger conveyor or double screw feeder, is specially‑designed heavy‑duty feeding & conveying equipment for difficult‑flow biomass raw materials in biomass pellet production lines.

Different from ordinary single‑shaft screw conveyors, it adopts two parallel counter‑rotating spiral shafts. It is excellent for wet sawdust, sticky wood chips, straw, rice husk and other bridging‑prone raw materials. It realizes silo bottom forced discharging, material breaking‑up, mixing and continuous conveying all‑in‑one. It effectively solves common pain points: material arching, bridging, blockage and uneven feeding caused by high‑moisture biomass materials. Widely installed under raw material silos, between hammer mills and dryers in pellet plants. Can work independently or integrate into full‑auto biomass pellet production lines.

Working Principle

Two spiral shafts run synchronously through gear‑box synchronous drive unit. The left‑hand and right‑hand spiral blades rotate towards each other. Materials enter the U‑shaped trough, and are continuously sheared, stirred and pushed forward by twin spiral flights. Clumped and bridged materials are broken up inside the trough. Raw materials are forced to discharge evenly without dead zones. Optional frequency‑conversion motor adjusts rotation speed to accurately control feeding capacity according to real‑time pellet‑plant production requirements.

Core Advantages

Powerful Anti‑bridging & Anti‑blocking Performance Twin‑shaft interleaved spiral structure breaks up clumped wet biomass. Greatly eliminate silo arching, material hanging and bridging problems which frequently happen on single‑screw machines. Ensure stable continuous feeding for downstream hammer mill and dryer.

Higher Conveying Capacity & Mixing Function Larger trough cross‑section compared with single‑screw of same dimension. Higher throughput. While conveying, it can slightly mix different kinds of biomass raw materials, improving raw‑material homogeneity for pelletizing.

Closed‑type Trough, Low‑dust Operation Sealed U‑shaped housing reduces dust overflow during sawdust and straw transportation, improves workshop environment and meets environmental‑protection standards. Multiple inlet & outlet positions are available for flexible layout.

Flexible Speed Regulation & Stable Feeding Optional variable‑frequency drive system, stepless adjustment of feeding volume. Maintain steady material supply for subsequent processing equipment, avoid feed fluctuation which affects pellet quality.

Heavy‑duty Industrial‑grade Construction Thickened carbon steel U‑trough, reinforced wear‑resistant spiral blades, heavy‑load bearing seats and synchronous gear drive. Strong torque, anti‑twist, long service life, suitable for long‑time 24‑h continuous running. Stainless steel is optional for special corrosion‑resistant requirements.

Perfect Matching for Biomass Pellet Production Line Mainly applied for raw‑material silo discharging, feeding for hammer mill and transfer before drying process. Seamlessly cooperate with crusher, hammer mill, rotary dryer, pellet mill and other auxiliary machines. Support single‑unit supply or full‑turnkey biomass pellet plant solution.

Technical Parameters（Customized according to project）

Note: Customized design available for special capacity, length and site condition.

Supply Scope

Dual‑shaft screw conveyor U‑trough housing, twin spiral shaft & blade assembly, synchronous gear reducer & motor, feeding & discharging ports, connecting flanges. Optional: frequency‑conversion control cabinet, protective cover. Service: 12‑month machine warranty, overseas installation guidance, lifelong spare‑parts supply, remote technical support.

Get Quote: Tell us your raw‑material type, moisture content, required capacity and installation length, our engineer will provide professional customized solution.