WLS420 × 6500 Shaftless Screw Conveyor — Product Introduction

Product Overview

The WLS420 × 6500 shaftless screw conveyor is an enclosed conveying unit designed for sticky and stringy bulk materials. Model breakdown: WLS denotes the shaftless screw conveyor series, 420 is the spiral blade outer diameter (φ420 mm), and 6500 is the conveying length of 6500 mm (6.5 m)抖音百科Dahan Conveyor Manufacturer.

Unlike conventional shafted screws, this unit removes the intermediate drive shaft, leaving only the spiral blade rotating inside a U-shaped trough. Material passes freely along the full blade length, so fibrous or stringy content is pushed forward without wrapping around a shaft — the key advantage for dewatered sludge, screenings, hair-like fibers, and kitchen waste.

Construction and Working Principle

Shaftless Spiral Blade

The blade is driven at the end only, leaving the entire conveying channel open. Fibrous and stringy material advances with the spiral without shaft winding — the core feature distinguishing this unit from standard screw conveyors.

U-Shaped Trough and Liner

The trough is U-shaped with a replaceable wear liner (wear-resistant nylon or polymer). The spiral operates with a small clearance against the liner, balancing conveying efficiency and wear life.

Drive Unit

End-mounted drive with direct gearbox or chain coupling, compact for installation beneath equipment or in mezzanine spaces. Installation angle can be adjusted within the industry-standard range of 0°–30°

Key Specifications

Structural dimensions are unit-specific; items marked "reference" are published values for comparable industry models and must be confirmed against your technical agreement / nameplate.

Applications

Sludge Transfer in Wastewater Treatment

Receives dewatered sludge cake from belt filter presses, plate-and-frame presses, or decanter centrifuges and delivers it to a sludge hopper, truck, or drying unit. The shaftless design handles sticky, high-moisture cake without clogging.

Screenings and Stringy Material

Fine-screen screenings, hair, and fibrous waste pass through the shaftless screw directly, replacing manual removal and reducing downtime.

Kitchen Waste and Livestock Manure

Sticky, fiber-laden kitchen waste, digestate, and manure are conveyed horizontally or at a small incline before anaerobic digestion or composting.

Sizing and Operating Notes

• Angle vs. capacity: capacity drops noticeably as the incline increases — from ≈11 m³/h horizontally to the ≈5 m³/h class at 30° — so size the unit for the actual installation angle.
• Material fit: designed for sticky, fiber-containing material; free-flowing dry powders are better served by a conventional shafted screw on cost grounds.
• Wear management: sand-laden material accelerates liner and blade wear — monitor residual liner thickness and blade edge wear regularly.
• Custom interfaces: inlet/discharge positions and flange dimensions can be matched to upstream dewatering equipment and downstream hopper elevations.