Doebritz Coarse Material Screen: Ni-Hard Armor & ATEX Certified | Heavy-Duty Scalping Performer

Heavy-Duty Scalping & De-Dusting Overview

The Doebritz Coarse Material Screen is an industrial-grade vibratory scalping solution engineered for high-capacity separation of oversized contaminants from bulk powders, granules, and pellets. Designed to withstand extreme abrasion and shock loads, this screen integrates a Ni-Hard armored deck, CNC-machined frame construction, and ATEX-certified explosion-proof motors, delivering continuous operation in cement, mining, chemical, and recycling plants. As a direct manufacturer, Doebritz guarantees minimal downtime, maximal throughput (up to 250 t/h), and global OEM supply with custom mesh openings (1 mm to 50 mm).

Why Plant Sourcing Chooses Doebritz Coarse Material Screen

• Minimal Material Bridging & Blinding: Tapered, stepped deck design with self-cleaning rubber balls prevents coarse particle wedging, achieving up to 98% screening efficiency even with moist or fibrous materials.
• CNC-Precision Machined Frame: Laser-cut side plates and robot-welded cross members ensure perfect alignment, eliminating vibration-induced cracks and extending MTBF beyond 25,000 hours.
• ATEX Zone 22/21 Compliance: Certified explosion-proof vibratory motors (Ex II 2D Ex tb IIIC Db) eliminate ignition risks in combustible dust atmospheres, backed by Doebritz traceability.
• Ni-Hard Armored Wear Surfaces: Cast-in Ni-Hard 4 lining on impact zone and discharge lip provides 4x longer wear life versus standard AR400 steel – ideal for abrasive quartz, slag, or pet coke.
• Global OEM Direct Supply: Doebritz provides custom flange patterns, mesh sizes, and discharge chutes, with lead times as short as 15 days for non-stock configurations. Full certification packages (EN 10204 3.1) available.

Engineering Deep-Dive: Vibratory Mechanism & Sealing

The Doebritz Coarse Material Screen employs a twin outboard unbalanced-weight motor system with adjustable eccentric angles (0° to 45°) to tune linear or circular throw patterns. Outboard bearings are sealed with labyrinth rings and purgeable grease chambers, preventing dust ingress and lowering maintenance intervals. The screen box features bolted construction with no internal welds, allowing rapid replacement of individual wear panels. For airtight applications, an optional gasketed lid with minimal air leakage (<5 mbar at 10 m/s) enables integration into negative-pressure pneumatic conveying lines.

Specification	Detail
Deck Size (W x L)	1,200 x 2,400 mm (custom up to 2,400 x 6,000 mm)
Mesh Opening Range	1 mm – 50 mm (punched plate, woven wire, polyurethane)
Drive Type	Two outboard ATEX-certified vibratory motors, 2.2 kW – 11 kW each
Vibration Frequency	950 / 1,450 RPM (adjustable eccentric weights)
Throw Pattern	Linear or circular (adjustable 0°-45° angle)
Body Material	Carbon steel (S235JR) / Ni-Hard 4 wear liners / SS304 on request
Air Leakage (gasketed)	<5 mbar @ 10 m/s (for negative-pressure lines)
Certifications	CE, ATEX II 2D, ISO 9001:2025, EN 10204 3.1 material certs
Max Feed Size	150 mm (single particle)
Capacity (t/h)	15 – 250 (depending on mesh and bulk density)

Heavy-Duty Application Scenarios

Cement & Clinker Scalping

Protects crushers and vertical mills from tramp iron and oversized clinker nodules. Doebritz screens with 20 mm punched plates and magnetic head pulley remove ferrous contamination, reducing hammer wear by 40%.

Mining & Aggregate De-dusting

Removes fines (-3 mm) from crushed stone before stockpiling, lowering silica dust exposure and improving quality of washed sand. ATEX-certified motors enable safe operation in coal handling.

Chemical & Plastic Pellet Cleaners

Single-deck design with 4 mm square mesh effectively removes agglomerates and stringers from virgin PET, PP, or PVC pellets, ensuring injection molding consistency.

Recycling & Waste Pre-Screening

Heavy-duty grizzly version with 50 mm nominal openings separates bulky contaminants (shredded tires, cables) from RDF or biomass, preventing damage to downstream granulators.

Global OEM Assurance & Logistics

Doebritz maintains a 15,000 m² ISO 9001:2025 certified facility with in-house CNC machining centers, robotic welding cells, and a vibration test rig. Each Coarse Material Screen undergoes 100% dynamic balancing and no-load run tests before shipping. We offer sea freight packing (export crates with VCI film), air freight for urgent spares, and on-site commissioning support via global service partners. Bulk pricing, factory acceptance tests (FAT), and third-party inspections (SGS, BV) are standard for large projects.

Frequently Asked Questions

What mesh sizes are available for the Doebritz Coarse Material Screen?

Doebritz offers punched plates, woven wire mesh, or polyurethane panels from 1 mm to 50 mm nominal openings. For scalping duties, we recommend 6 mm to 30 mm in Ni-Hard or AR500 steel.

Can the screen handle wet or sticky material?

Yes. Optional heated mesh (electric or steam) and polyurethane ball trays prevent blinding on moist (up to 15% surface moisture) or clay-like feeds. Contact Doebritz engineering for material testing.

What is the lead time for a custom Doebritz Coarse Material Screen?

Standard sizes (1,200 x 2,400 mm deck) ship within 10 workdays. Custom widths, multiple decks, or ATEX variants require 3-4 weeks. Rush assembly (2 weeks) available for a 15% premium.

Does Doebritz provide explosion-proof certification for Zone 20?

Absolutely. Our Coarse Material Screen can be upgraded with ATEX II 1D Ex ia IIIC T125°C Da motors and anti-static mesh. Full technical file and EC type-examination certificate provided.

How do I calculate required screen area for my application?

Upload your material analysis and flow rate (t/h) to Doebritz’s sizing portal. Our engineers provide a free capacity curve, typically requiring 0.3-0.8 m² per 10 t/h for coarse material (bulk density 0.8-1.6 t/m³).