Lid Open Vertical Automatic Bottom Discharge Centrifuge

The Lid-Open Vertical Automatic Bottom Discharge Centrifuge is a batch-type solid-liquid separation system engineered for chemical, pharmaceutical, and industrial crystalline slurry filtration. Featuring a hydraulically opening top cover and a bottom-discharge structural frame, this centrifuge streamlines automated cake unloading and simplifies filter cloth maintenance.

The batch filtration process is managed by a PLC with speed control via an integrated Variable Frequency Drive (VFD).

• Feeding: Slurry enters the basket through the feed pipe while it rotates at a preset feeding speed. Feed volume is regulated by a timer or liquid level sensors.
• Filtration: The basket accelerates to operational speed. Centrifugal force drives the liquid through the filter cloth and basket perforations, leaving a solid cake on the inner basket wall.
• Washing: Wash liquid is distributed over the filter cake through internal spray nozzles to displace mother liquor, followed by a secondary spin-drying cycle.
• Deceleration & Scraping: The VFD decelerates the basket to a low scraping speed of ≤ 50 rpm. The scraper pivots and advances radially to remove the cake layer by layer.
• Bottom Discharge: Dislodged solids fall through the bottom discharge port into downstream collection or conveying systems.

• Scraper Kinematics: Hydraulic actuators drive the scraper at controlled rates to prevent mechanical overload. Pneumatic actuation is available as an option.
• Residual Heel Layer: Mechanical scraping leaves a nominal 3–8 mm residual cake layer to protect the filter cloth from direct blade contact. The actual thickness depends on the slurry particle characteristics and filter cloth specification.
• Optional Heel Clearance: A reverse gas-blowback system or air-knife assembly can be integrated behind the filter cloth to loosen residual solids when minimizing cross-contamination between batches is essential.

• Volumetric Range: Standard basket capacities range from 100 L (PGZ-800) to 600 L (PGZ-1600).
• Cycle Duration: Typical batch cycle times range from 15 to 45 minutes, depending on feed rate, slurry drainability, cake washing requirements, and target dryness.
• Throughput Sizing: Actual throughput should be evaluated through pilot slurry filtration tests rather than basket volume alone.

• Operating Range: Recommended for slurries containing 5%–50% solids by weight, with particle sizes generally above 10 μm.
• Process Boundaries: The centrifuge may be unsuitable for untreated colloidal suspensions with particle sizes below 5 μm or high-viscosity gels that rapidly blind the filter cloth. Actual cake moisture depends on crystal structure and spin time.

• Metallurgy Options: Product-contact components, including the basket, casing interior, piping, and scraper, are manufactured from SUS304 or SUS316L stainless steel as standard. Duplex 2205, titanium, or HALAR/PTFE coatings can be specified for compatible corrosive applications.
• Surface Finish: Product-contact stainless steel surfaces are mechanically polished to Ra ≤ 0.4 μm. Surface roughness inspection reports based on calibrated profilometer measurements can be provided during Factory Acceptance Testing (FAT).

Dynamic Balancing: Baskets undergo dynamic balancing verification per ISO 21940-11 (Grade G2.5 balance precision for rigid rotors).

Weld Inspection: Critical liquid-contact welds undergo Dye Penetrant Testing (PT) where specified in the quality plan.

Standard Documentation Package:

General Arrangement & Dynamic Foundation Loading Drawings

Electrical & Pneumatic Schematics

Material Test Certificates (EN 10204 3.1) for Wet-End Metallic Parts

Dynamic Balancing Test Certificates

Factory Acceptance Test (FAT) Run Report

• Spare Parts & Wear Items: Recommended spare parts lists (shaft seals, scraper blades, lid gaskets, filter cloths) with availability schedules are provided upon order confirmation.
• Field & Remote Support: On-site engineering supervision for installation and slurry commissioning is available upon contract agreement. Remote PLC diagnostic support is provided as standard.

1. When should I choose a lid-open scraper centrifuge over a flat-plate manual-unloading model?

Choose the scraper above about 10 batches per day, because the automatic cycle takes 15-45 minutes with no operator at the basket.

2. What does the hydraulically opening lid give me compared with a fixed-cover scraper centrifuge?

The lid swings fully open in 20-40 seconds, giving direct access to the basket for cloth replacement and visual inspection.

3. How do I calculate throughput for my process?

Throughput (kg/h) = dry load per batch × 60 ÷ cycle time in minutes. For example, 250 kg per batch with a 25-minute cycle gives about 600 kg/h.

4. How often is the heel layer removed?

The 3-8 mm heel stays on the cloth to protect it and is cleared by cloth washing, typically every 20-50 batches. Wash sooner if the filtration rate drops more than 20%.

5. When do I need the gas-blowback or air-knife heel clearance option?

Choose it for multi-product or pharmaceutical lines where residual carryover must stay below 1% of the batch weight.

6. How often are the main bearings replaced?

Every 3-5 years, or about 25,000-40,000 running hours. Quarterly vibration checks help schedule the replacement before failure.

7. How much headroom does the open lid need?

Allow 1.5-2 m above the casing for a 1250 mm basket with the lid fully open, plus 1.2-1.5 m below the basket for the discharge hopper or conveyor.

8. What is the typical lead time?

Stainless steel models ship in 45-75 days from the deposit, and titanium or lined builds in 90-120 days. ATEX/IECEx configurations add 2-4 weeks.

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