Enclosed Vibration Sifter, Doebritz Industrial Sifter, ATEX / 316L Stainless Steel

Product Summary

For demanding powder and bulk solids handling, the Doebritz Enclosed Vibration Sifter sets a new benchmark in high-capacity classification and safety. Engineered for feeding rates up to 50 t/h, this fully enclosed sifter delivers precise separation of oversize particles and foreign contaminants from free-flowing powders, granules, and pellets. Certified for explosive environments with ATEX Zone 22, the Doebritz unit features a dust-tight housing, rapid-change screen frames, and a maintenance-free vibratory drive. Whether integrated into pneumatic conveying lines, silo discharge chutes, or bag dump stations, this industrial sifter guarantees maximum product purity with minimal air leakage.

Why Source Doebritz Enclosed Vibration Sifters

Leading plant engineers and global OEMs choose Doebritz because our equipment directly reduces downtime and increases yield. Unlike standard sifters, the Doebritz design incorporates heavy-duty vibration isolation, precision laser-cut screen decks, and fully accessible inspection ports. Key competitive advantages include:

• Maximal Uptime: Quick-release screen clamps allow screen change in under 60 seconds.
• Explosion Safety: Full ATEX 2014/34/EU certification for Zone 22 dust atmospheres, with conductive gaskets and earthing.
• Zero Contamination Risk: 316L stainless steel contact parts with electro-polished finish to meet FDA and food-grade standards.
• Superior Drive Efficiency: Low-maintenance 3-phase induction motor with adjustable eccentric weights for optimal material acceleration.
• Global OEM Supply: Customizable inlet/outlet flanges (DIN, ANSI, JIS) and silicone/PTFE seals for aggressive media.

Housing & Rotor Engineering

The Doebritz Enclosed Vibration Sifter features a fully welded, stress-relieved housing manufactured from 316L stainless steel or carbon steel with epoxy coating. The housing geometry incorporates a conical inlet to distribute feed material evenly across the full screen width, preventing central loading and increasing effective screening area. The vibratory drive uses outboard bearing blocks with permanently lubricated, double-lip seals, isolating the bearings from dust ingress. The screen frame is precision CNC laser-cut with a crowned tensioning system, ensuring uniform screen mesh tension for accurate cuts down to 150 microns. All weld joints are ground and polished, eliminating ledges where product could accumulate. The quick-release clamping system uses four over-center latches with safety lockouts, allowing one operator to access the screen deck.

Technical Specifications

All specifications are verified under factory test conditions at nominal amplitude and 50 Hz power supply. For custom configurations (special voltages, high-temperature seals, or explosion isolation flaps), please contact our engineering team.

Specification	Detail
Body Material	316L Stainless Steel (standard) / Carbon Steel with epoxy coating (option)
Screen Diameter	600 mm / 900 mm / 1200 mm
Motor Power	0.55 kW up to 2.2 kW, 230/400V, 3-phase
Max. Throughput	Up to 50 t/h (depending on bulk density and mesh size)
Screening Mesh	0.15 mm to 10 mm, woven wire or perforated plate
Air Leakage	< 5 m³/h at 500 mm WG differential pressure
ATEX Certification	II 3D Ex tc IIIC T120°C Dc (Zone 22)
Operating Temp.	-20°C to +120°C (standard), -20°C to +250°C (HT option)

Heavy-Duty Application Scenarios

Pneumatic Conveying Systems

Installed directly below dilute- or dense-phase receivers, the Doebritz Enclosed Vibration Sifter removes agglomerates and foreign objects up to 1.5 kg before material enters storage silos or downstream mills. The fully sealed design prevents air loss, preserving conveying line pressure.

Silo Discharging with Lump Breaking

When mounted on silo outlets, the sifter combines classification with gentle breaking of soft agglomerates. The integrated bypass chute allows over-size material to be diverted to a separate mill or waste bin without stopping production.

Dust Filter Collector Protection

In recycling and mineral processing plants, the Doebritz sifter protects baghouse filters and cartridge collectors from sharp or abrasive particulates. By removing tramp metal and large fragments upstream, filter bag life is extended by up to 300%.

Frequently Asked Questions

What is the typical lead time for a Doebritz Enclosed Vibration Sifter?

Standard units with cast iron housing and 304 stainless steel contact parts ship within 4-6 weeks. Custom builds (316L, special drives, or ATEX) require 8-10 weeks including full factory acceptance testing with your material sample.

Can Doebritz provide custom inlet/outlet flange drilling patterns?

Yes. As an OEM supplier, we support DIN, ANSI 150#, PN10/16, JIS 10K, and customer-specific bolt hole patterns. Minimum order quantity for custom flanges is 5 units, with CAD drawing approval required.

Is the sifter available with ATEX certification for gas atmospheres?

Our standard ATEX offering covers dust Zones 22 and 21 (with enhanced housing). For gas Zone 2 (explosive gas atmospheres), we offer an Ex nA version with specially sealed motors and antistatic screens. Please request ATEX Gas Zone 2 datasheet.

What is the maximum operating temperature?

Standard silicone seals allow 120°C continuous. For hot materials up to 250°C, we offer a high-temperature configuration with FKM Viton seals, elevated motor mounting (decoupled via belt drive), and thermal expansion gaps in the screen frame.

How is the screen mesh changed and cleaned?

The Doebritz sifter features a top-accessed screen deck. Loosen four captive hand knobs, swing open the inspection cover, and release the two cam buckles securing the screen frame. The frame lifts out in one piece for cleaning or mesh replacement. Typical change time: 2 minutes by one operator.