Vertical Conical Mixer, Doebritz Industrial Blender, 10-10000L / ATEX Certified / High-Shear

Product Summary

Doebritz Vertical Conical Mixers are heavy-duty industrial blending systems engineered for homogenous mixing of dry powders, granules, and flaky materials. Capacities range from 10L to 10,000L with ATEX-certified explosion-proof configurations for Zone 21/22. The unique conical design ensures rapid discharge via a large bottom outlet, minimal residual material, and zero segregation. Ideal for chemical, mineral, pharmaceutical, and food processing industries requiring CIP/SIP-ready surface finishes.

Why Source Doebritz Vertical Conical Mixers?

• Precision Machined Rotor: 5-axis CNC-machined blending screw and 3-arm lance reach full cone volume with <0.5mm runout for ultra-low shear uniformity.
• Minimal Air Leakage: Patented gland packing + mechanical dual-seal system reduces leakage to ≤0.1 Nm³/h at 1 bar differential, saving pneumatic conveying energy.
• Explosion-proof Ready: ATEX II 2D/2G certification with anti-static PTFE seals, earth continuity kit, and dust-ignition-proof motor included.
• Global OEM Supply: Customizable inlet/outlet flanges (ANSI, DIN, JIS), heating/cooling jackets, and 316L stainless steel contact parts for sanitary applications.
• Ultra-long MTBF: Outboard bearing housing with grease-packed labyrinth seals — 50,000 hours B10 bearing life under full load.

Housing & Rotor Engineering

The Doebritz Vertical Conical Mixer housing is centrifugally cast from GX40CrNiSi25-20 (wear-resistant stainless steel) or nodular cast iron EN-GJS-500-7 for abrasive bulk solids. The integrated conical hopper has a 60° apex angle to promote mass flow without bridging. Inside, the tri-blade rotor consists of a bottom scraper, intermediate helical ribbon, and top dispersion blade — all hardfaced with tungsten-carbide coating (optionally Stellite 6). The lance drive is equipped with a torque-limiting coupling and a 4.0 safety factor gearbox, while the external bearing housing isolates the product zone from lubricants. All welds are continuous, ground, and passivated (Ra < 0.8μm for food/drug grades).

Technical Specifications

The following table outlines standard configurations for the Doebritz Vertical Conical Mixer series. For non-standard rotor speeds, heating jackets, or explosion-isolation valves, our engineering team provides full customisation within 3-5 weeks.

Specification	Standard Range / Detail
Total Volume	10 L – 10,000 L
Body Material	Cast Iron EN-GJS-500-7 / Stainless Steel 304 / 316L (sanitary finish)
Rotor Design	Helical ribbon + bottom scraper + top dispersion blade (all hardfaced)
Drive Power	0.55 kW – 110 kW, IE3 / ATEX motor available
Mixer Speed	20 – 90 rpm (inverter controlled optional)
Max Operating Temp.	-20°C to +300°C (with engineered seals)
Max Internal Pressure	-1 bar to +3 bar
Leakage Air (static)	≤ 0.1 Nm³/h at 1 bar differential
ATEX Cert.	II 2D Ex h IIIC T125°C Db / II 2G Ex h IIB T4 Gb
Discharge Flange	ANSI 150# / DIN PN10 / JIS 10K (others custom)
Surface Finish	Ra 3.2μm standard / Ra 0.4μm electropolished (pharma grade)
Cleaning	Manual access door / Optional CIP spray balls

Heavy-Duty Application Scenarios

Pneumatic Conveying Systems Integration

Installed as a blending silo discharger with integral rotary airlock, the Doebritz Vertical Conical Mixer feeds dilute- or dense-phase conveying lines directly. The bottom discharge mates to a DN200 PN10 flange with purge cone to prevent blowback. Combined with our Doebritz blow-through valve FTV-900, it achieves feeder rates up to 80 t/h with ±2% accuracy.

Silo Discharging With Active Blending

Replaces passive mass-flow cones. The vertical conical mixer actively re-blends segregated powders (e.g., lime, cement, or plastic pellets) during silo extraction, ensuring consistent bulk density to downstream packing machines or reactors. ATEX-rated version available for dust explosion hazard zones.

Dust Collector Hopper Service

Below bag filters or cartridge collectors, the Doebritz unit acts as an airlock mixer that conditions recovered dust (e.g., carbon black, metal oxides) with virgin material before reintroduction. Heating jackets prevent condensation sticking. The conical bottom provides complete emptying, preventing cross-contamination in batch changeovers.

Frequently Asked Questions

What are the lead times for a Doebritz custom vertical conical mixer?

Standard cast-iron models with ATEX certification ship in 4-6 weeks. Stainless steel 316L with electropolished surface and CIP spray nozzles takes 8-10 weeks. Expedited 3-week delivery is available on request for rush projects.

Can you supply non-standard inlet/outlet flanges or vessel connections?

Absolutely. As a full OEM manufacturer, Doebritz machines any international flange: ANSI B16.5, DIN EN 1092-1, JIS B2220, or metric sanitary clamp (ISO 2852). We also integrate customer-specified top covers, lump breakers, or sampling ports.

Is your vertical conical mixer ATEX certified for Zone 21 dust explosions?

Yes, standard units carry ATEX II 2D Ex h IIIC T125°C Db for zone 21 and II 2G Ex h IIB T4 Gb for gas. We also provide IECEx, CSA, or KCs upon request. All explosion-proof components (motor, proximity sensors, solenoids) are included.

What maximum temperature and pressure can the mixer withstand?

The design allows jacket pressures up to 10 bar (steam or thermal oil) and internal operating pressure -1 to +3 bar. Temperature range: -20°C to +300°C with appropriate seals (FKM, EPDM, or Kalrez®). A thermal expansion compensation kit is optional for extreme cycles.

How is cleaning performed for batch changeovers?

For non-sanitary duties, a quick-opening door provides access for sweep cleaning. For food/pharma, we offer a CIP-ready design with rotating spray balls, sloped welds, and a drainable bottom outlet. CIP verification port for conductivity sensors is standard.