Inclined Vibrating Screen, Doebritz Screening Classifier, 250 TPH / ATEX Certified / Heavy-Duty Dewatering

Product Summary

Doebritz presents the next generation of Inclined Vibrating Screen technology, engineered for punishing continuous operation in aggregate, mining, and bulk solids processing. Achieving a nominal throughput of 250 tons per hour (TPH) with ATEX certified explosion-proof configuration available for hazardous dust environments (Class II/III, Groups E/F/G). The steep inclination angle (15-30°) combined with a high-G-force vibratory mechanism delivers superior stratification, dewatering, and separation efficiency for powders, granules, and flaky materials while eliminating blinding or pegging.

Why Source Doebritz Inclined Vibrating Screen

Global procurement managers and plant engineers choose Doebritz for mission-critical screening applications because we eliminate the four major cost drivers: downtime, re-screening, energy waste, and unplanned maintenance.

• Extended Bearing Life ( > 50,000 hours ): Heavy-duty spherical roller bearings with a patented labyrinth seal block fine dust ingress, reducing lubrication cycles by 60% compared to standard screens.
• High G-Force ( up to 8 Gs ): Adjustable eccentric shaft assembly allows field tuning of stroke (8-14mm) and speed (850-1000 RPM) to match challenging materials like sticky clay or abrasive iron ore pellets.
• CNC-Punched Deck Frames: 12mm Hardox 450 wear-resistant steel punched on CNC machining centers ensure micron-level aperture consistency (±0.1mm), drastically improving separation accuracy and reducing recirculation load.
• OEM Modular Design: Fully compatible with all major screen media (woven wire, polyurethane, perforated plate) and quick-tensioning systems. We supply direct to integrators or end-users with full technical drawings and CE/ATEX documentation.

Housing & Rotor Engineering

The Doebritz Inclined Vibrating Screen features a stress-relieved, shot-blasted housing fabricated from S355J2+N structural steel with full penetration welding at all cross-members and side plates. Unlike light-duty screens that suffer from side plate cracking, our FEA-optimized side plates are 15mm thick with integral rolled reinforcement flanges. The vibratory mechanism is a four-shaft, gear-synchronized exciter with eccentric weights mounted directly on the drive shaft. Each eccentric lobe is precision-balanced (ISO 1940 G6.3) to eliminate parasitic vibration transmission to the support structure. The critical shaft connection uses a spline coupling instead of keyways, removing stress risers and ensuring zero backlash under sustained high G-force. An optional pneumatic deck cleaning system and spray water manifold are available for sticky or friable materials.

Technical Specifications

All Doebritz Inclined Vibrating Screens are supplied with a certified test report, including vibration amplitude, noise level (≤85 dBA at 10m), and dynamic load calculations. Base configurations support -10°C to +80°C ambient operation; high-temperature seals and bearings available for clinker and foundry sand up to +250°C. Custom flange drilling (ANSI #150 / DIN / JIS), material certifications (EN 10204 3.1), and specialized surface treatment (epoxy + polyurethane top coat, 300µm DFT) for aggressive chemical environments are available as production options.

Specification	Detail
Model Size (Width x Length)	1.5m x 4.2m / 1.8m x 5.0m / 2.4m x 6.0m
Body Material	S355J2+N structural steel (Hardox 450 wear liners optional)
Rotor Design / Vibrator Type	Four-shaft, gear-synchronized eccentric exciter
Throughput Capacity	Up to 250 TPH (depending on material density & aperture)
Screen Inclination Angle	15° to 30° (adjustable during installation)
Vibration Frequency	850 – 1000 RPM (optional high-frequency 1500 RPM)
Amplitude (Stroke)	8 – 14 mm (adjustable via eccentric weights)
Max Feed Size	Up to 300 mm (depending on deck aperture)
ATEX Certification	Ex h IIB T4 Gb / Ex h IIIC T135°C Db (Zone 1, 21)
Bearing Type	Spherical roller, C4 clearance, labyrinth sealed

Heavy-Duty Application Scenarios

Primary & Secondary Aggregate Classification

In quarries and sand plants, the Doebritz Inclined Screen handles blasted rock (-300mm) down to 4mm sand fractions. The steep inclination rapidly removes fines before the cone crusher, reducing wear on crushing chambers and increasing total plant throughput up to 18%.

Bulk Material Handling & Dewatering

For coal, iron ore pellets, and mineral concentrates, the screen achieves outstanding dewatering performance with residual moisture < 8%. The counter-flow design combined with a high-frequency (1500 RPM) variant eliminates surface water efficiently without blinding.

Dust-Filtered & Explosible Environments

Fully enclosed ATEX-certified configuration with integrated dust-tight skirts and pressure shock resistant housing (10 barg) for pneumatic conveying systems or wood pellet plants. Optional intrinsically safe vibration monitoring (4-20mA output) for integration into a SIL-2 safety loop.

Frequently Asked Questions

Q1: What is the typical lead time for a Doebritz Inclined Vibrating Screen with ATEX certification?

A: Standard units (non-ATEX) ship in 4-6 weeks. For ATEX-certified screens with full documentation, lead time is 8-10 weeks from order and deposit, including third-party inspection (TÜV). Expedited options are available for OEM partners.

Q2: Can you supply the screen with different media (woven wire / polyurethane) and quick-change tensioning?

A: Yes, 100%. Doebritz supports bolted-down, modular polyurethane panels, hook-strip woven wire, and tensioned perforated plate. We also supply the patented Quick-Clip tensioning system that reduces media changeover from 4 hours to 45 minutes. Just specify your media type and aperture size.

Q3: Do you offer non-standard flange drilling and custom infeed/outfeed chute adapters?

A: Absolutely. As a heavy OEM supplier, we provide customized inlet boxes, discharge lips, and flange patterns to match your existing conveyor systems. Submit a dimensional drawing (DWG/STEP) of your interface, and our engineering team will provide a matched adapter drawing within 48 hours.

Q4: What is the maximum operating temperature for the high-temperature version of this screen?

A: The standard design handles up to +80°C material temperature. With our High-Temp Package (special Viton® seals, C4-class bearing clearance, and heat-shielded exciter), the screen reliably processes materials up to +250°C (e.g., hot sinter, foundry sand).

Q5: How do I verify the dynamic loads to design my support structure?

A: Every Doebritz screen includes a dynamic load calculation certificate. We provide the maximum operating forces (Fmax), static weights, and the required isolation spring stiffness. For critical installations, we can provide an FEA model of the screen subframe upon NDA signature.