Industrial Cone Mill, Doebritz Comminution, High-Precision Size Reduction / ATEX Certified

Product Summary

Doebritz Industrial Cone Mill sets the benchmark for controlled size reduction of powders, agglomerates, and granulated materials in dense phase pneumatic systems. With a throughput capacity exceeding 15 mt/h (depending on screen size and material density) and a robust ATEX-certified explosion-proof configuration for Zone 21/22 dust environments, this milling machine ensures particle uniformity from 0.5 mm to 10 mm. The cantilevered rotor design and gap-optimized conical screen enable residual material wall scraping, effectively preventing smearing or overheating even with heat-sensitive pharmaceutical or chemical products.

Why Source Doebritz Industrial Cone Mill

Global OEM procurement engineers choose Doebritz because of three zero-compromise differentiators: Longevity through metallurgical precision, hermetic sealing below 3 ppm oxygen ingress, and 15-minute screen changeover time. Compared to standard cone mills, Doebritz units incorporate heavy-duty outboard bearings isolated from the product zone, eliminating contamination risks commonly found in overhung rotor designs. Each mill undergoes individual dynamic balancing and factory acceptance testing (FAT) with your actual material or simulant. Furthermore, our Lean manufacturing allows 4-week delivery on non-stock configurations, including customized flange drilling patterns per DIN/ANSI standards.

• Ultra-Low Clearance Rotor: CNC-machined rotor tip to screen clearance down to 0.3 mm ensures narrow particle size distribution and dust suppression.
• ATEX Zone 21 Certified: Explosion-proof motor, antistatic belt option, and earth-continuous housing standard for combustible dusts.
• Sanitary & CIP Ready: Full stainless steel 316L contact parts with polished surface finish Ra <0.8 µm for pharma/food applications.
• Global Supply Chain Support: Stocked wear parts (screens, impellers) shipped within 48 hours to over 60 countries.

Housing & Rotor Engineering

Doebritz Industrial Cone Mill housing is manufactured from investment-cast Duplex Stainless Steel 1.4469 as standard for chemical resistance, with optional Hastelloy C-22 for high-chloride or acid environments. The split-housing design allows full access to the milling chamber without removing the drive motor or inlet/outlet ductwork. Rotor geometry features a three-blade, variable helix impeller – the first 20% helix angle breaks hard agglomerates, while the final 5° angle gently pushes material through the perforated screen. All rotors are CNC-machined from solid billet then dynamically balanced to ISO 1940 G6.3, guaranteeing vibration-free operation up to 1500 RPM. A proprietary mechanical face seal with nitrogen purge port limits air leakage to <1.5 Nm³/h at 0.5 bar differential pressure, critical for inerted conveying lines or VOC containment.

Technical Specifications

Every Doebritz Industrial Cone Mill is built to your duty cycle. Below table indicates standard parameters for model CM-DN150, which can be scaled up to DN400 inlet/outlet. All data are verified via third-party laser particle analysis and vacuum decay leak tests. For custom requirements (e.g., higher pressure shock resistance, 400°C high-temperature version), our engineering team provides simulations and FEA reports within 5 working days.

Specification	Detail
Body Material	DSS 1.4469 / 316L / Hastelloy C-22 (optional)
Rotor Design	3-blade variable helix, CNC billet, balanced G6.3
Screen Options	Perforated: 0.5–10 mm round holes; Laser-cut: herringbone / tear-drop
Max Throughput	Up to 15 mt/h (depends on material density & screen size)
Speed Range	300 – 1500 RPM (frequency inverter controlled)
ATEX Certification	II 2D Ex h IIIC T125°C Db (Zone 21/22)
Air Leakage Rate	<1.5 Nm³/h at 0.5 bar differential (tested per ISO 15848-1)
Max Operating Temperature	Standard: -20°C to +150°C; With cooling jacket: -50°C to +400°C

Heavy-Duty Application Scenarios

Pneumatic Conveying Systems (Dilute & Dense Phase)

When installed directly below a cyclone or receiver filter, the Doebritz Cone Mill eliminates post-agglomeration caused by humidity absorption or static charge. The low-pressure-drop design (max 0.15 bar at full capacity) preserves conveying line velocity while delumping compacted powder from silo discharge. Suitable for polyolefins, carbon black, lime, and cement additives.

Pharmaceutical & Nutraceutical Milling (OEB3 / OEB4)

Equipped with a containment interface (split butterfly valve or continuous liner system) and a WIP nozzle array, the Doebritz Cone Mill meets cGMP and FDA 21 CFR Part 11 requirements. Our patented rotor with rounded leading edges minimizes frictional heat, preserving API potency for wet granulation or dry milling of paracetamol, lactose, and microcrystalline cellulose.

Recycling & Battery Material Processing

The heavy-gauge housing (8 mm wall thickness) and replaceable hardened screen liners extend service life when milling black mass (Li-ion batteries), fiberglass-filled plastics, or rubber crumb. An optional inert gas flushing port and oxygen analyzer connection allow full nitrogen blanketing for thermal runaway prevention.

Food & Spice Grinding

With quick-release clamps and no dead-leg design, the Doebritz cone mill reduces caked sugar, spice blends, or dehydrated vegetable flakes without generating excessive fines. The machine is EHEDG-certified for CIP/SIP cycles with automated rising temperature validation.

Frequently Asked Questions

Q1: Does Doebritz support non-standard flange drilling patterns or custom inlet/outlet orientations?

Absolutely. As an engineering-driven OEM, we customize flange drilling per your GA drawing (ANSI 150#, PN10/16/25, JIS 10K) and can relocate the feed chute or discharge spout to 0°, 90°, or 180° positions. A surcharge applies only for non-standard pressure ratings above PN16.

Q2: What ATEX certifications are available for the Industrial Cone Mill?

Doebritz offers full ATEX directive 2014/34/EU: Category 1/2D for gas and dust (zone 20/21) with certified EPL Da/Db marking. We provide the complete EC-Type Examination Certificate and an Instruction for Safe Use (X-conditions). Additionally, our motors are available with IECEx and CSA approvals.

Q3: What is the typical lead time for a non-stock configuration (e.g., 316L + high-temperature seal + explosion-proof motor)?

Standard Doebritz cone mills are shipped in 12 working days. For fully customized units (different material, special rotor geometry, or high-temperature seals up to 400°C), our lead time is 4 to 6 weeks, including factory pressure tests and material certificates (EN 10204 3.1). We offer expedited “Red Label” production for urgent breakdown replacements at 20% extra cost, reducing delivery to 15 calendar days.

Q4: Can Doebritz supply spare screen packs and rotors as a recurring order program (blanket PO)?

Yes. We manage VMI (Vendor Managed Inventory) contracts for global clients, staging wear parts in our Houston, Rotterdam, and Shanghai hubs. Call-off lead time is 3 days for standard 1.0 mm to 10.0 mm round hole screens, and 10 days for laser-cut herringbone or tear-drop pattern screens. Every spare rotor is serial-numbered and comes with a dimensional compliance report.

Q5: How does the Doebritz cone mill protect against product heating or thermal degradation during continuous operation?

All Doebritz mills feature a circulating cooling jacket option that bolts onto the conical screen housing. You can connect chilled water (max 6 bar) or a glycol mixture to remove frictional heat, holding product temperature below +10°C above ambient. For extremely heat-sensitive materials like chocolate or thermoplastic powders, we offer a liquid nitrogen injection port that reduces milling chamber temperature to -50°C, embrittling sticky materials for consistent friability.