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| Brand Name: | Foshan City Chengtong Machinery Co., Ltd. |
| Model Number: | WLS420×8500 |
| MOQ: | 1 |
| Price: | custom-made |
| Payment Terms: | D/A,D/P,T/T,L/C |
| Supply Ability: | Stable, punctual and sufficient supply; |
The WLS420×8500 sludge dryer feed screw conveyor is a shaftless screw conveyor (WLS series) purpose-built as the feed stage of sludge drying lines. It receives dewatered sludge from filter equipment and delivers it continuously at a controlled rate into the inlet of a low-temperature sludge dryer. Installed at a -20° downward incline, the unit moves material downward under both gravity and screw thrust, forming a steady feed stream that prevents wet cake build-up and bridging at the dryer entry.
Wetted parts are selected for sludge duty: the trough and cover are 304 stainless steel, the spiral is manganese steel, and the trough is lined with a 10 mm UHMWPE liner, combining corrosion resistance, abrasion resistance, and low friction. The shaftless design suits high-moisture, fiber-laden sludge and is a typical configuration for dryer feed applications.
| Item | Specification |
|---|---|
| Model | WLS420×8500 |
| Installation angle | -20° (downhill feed) |
| Capacity | 8 m³/h |
| Motor power | 5.5 kW × 1 |
| Spiral material | Manganese steel |
| Spiral outer diameter | φ420 mm |
| Pitch | 350 mm |
| Blade section | 20 × 160 mm |
| Trough | 304 stainless steel, 4 mm plate |
| Cover | 304 stainless steel, 2 mm plate |
| Liner | 10 mm UHMWPE |
| Inlet | 1 × φ450 mm (cover side) |
| Outlet | 1 × φ450 mm (trough side) |
The -20° incline lets the spiral push material downward against gravity, creating a fixed elevation difference between inlet and outlet. The unit connects directly to the dryer inlet, avoiding cake build-up and compaction at the feed point.
The trough uses 4 mm plate and the cover 2 mm plate, both 304 stainless steel for corrosion resistance in sludge environments. One φ450 mm outlet is on the trough side and one φ450 mm inlet on the cover side; both can be matched to the dryer inlet flange.
With a φ420 mm outer diameter, 350 mm pitch, and a 20 × 160 mm blade section, the manganese steel spiral delivers better wear resistance than carbon steel for sand-laden filter cake. The shaftless design advances fibrous and hair-like material without wrapping, a key requirement in dryer feed duty.
A 10 mm ultra-high molecular weight polyethylene liner provides a low-friction, self-lubricating surface, reducing wear on both the spiral and the trough. The liner is a replaceable wear component, keeping the major overhaul interval practical in abrasive service.
The shaftless spiral is driven only at one end and rotates inside a U-shaped trough, advancing material continuously along the full blade length. With the -20° downhill arrangement, the gravity component acts in the same direction as screw thrust. The 8 m³/h figure is the design capacity; actual throughput varies with sludge moisture content and viscosity.
Spiral diameter, length, incline angle, and inlet/outlet positions can be customized to the dryer feed elevation and site layout. During operation, monitor residual UHMWPE liner thickness and spiral blade edge wear regularly — sand-laden material accelerates wear.
