Double-Tooth-Roll Filter Cake Crusher

Product Overview

A double-tooth-roll filter cake crusher is a low-speed crushing machine designed for dewatered sludge cake, kitchen waste, biomass, and other high-moisture, sticky materials. Two parallel toothed rolls rotate toward each other, shearing and crushing lumpy filter cake to a specified particle size, preventing blockage of downstream conveying or drying equipment.

This unit is installed upstream of sludge drying, incineration, or composting systems in wastewater treatment plants, breaking large filter cake discharged from plate-and-frame or belt filter presses into a uniform size range for improved downstream drying efficiency.

Construction

Housing and Rolls

• Rectangular enclosed housing with top inlet and bottom discharge; side plates are bolted and removable for maintenance
• Two toothed rolls arranged in parallel with herringbone-style teeth, producing combined shear and compression crushing
• Roll diameter Φ550 mm; roll speeds 116 rpm and 84 rpm respectively — a differential speed arrangement that reduces wrapping risk for wet, sticky material

Material and Corrosion Protection

• Inlet hopper, discharge hopper, shaft cores, crushing rolls, and internal liners are 304 stainless steel
• Remaining structural parts are carbon steel
• Whole unit painted with 120 μm dry film thickness

Drive and Transmission

• Independent motor-gearbox drive per roll, eliminating alignment requirements of a single long-shaft arrangement
• Gearbox models: KA87-17.42-M3 / KA87-12.56-M3
• Motor power: 2 × 15 kW
• Power supply: 415 V / 50 Hz (export configuration)

Technical Specifications (PSJ/2-Φ550×1250)

Applications

Pre-Drying Sludge Cake Reduction

Filter cake discharged from plate-and-frame filter presses is often in large, uneven slabs (30–50 mm thick). Feeding these directly into a low-temperature dryer causes uneven distribution. This crusher breaks the cake to 80% ≤ 40 mm before it is conveyed by scraper chain conveyor into the dryer, improving feed uniformity.

Sludge Incineration and Co-Disposal

Before entering a sludge incinerator or cement kiln co-processing line, filter cake must be crushed to a feedable size to prevent bridging and jamming. The low-speed differential toothed rolls handle high-moisture material without overheating or ignition risk.

Kitchen Waste and Biomass Pre-Treatment

Sticky kitchen waste, digestate, and animal manure can be de-lumped by the double-tooth-roll crusher before anaerobic digestion or composting, improving downstream fermentation efficiency.

Sizing and Installation Notes

• Discharge size: This model delivers 80% ≤ 40 mm; finer output requires adjusted roll gap or a secondary crushing stage
• Moisture range: Designed for dewatered filter cake (approximately 60%–80% moisture); dilute slurries are not suitable
• Voltage configuration: Standard export voltage is 415 V / 50 Hz; domestic projects can be reconfigured for 380 V motor and gearbox
• Maintenance clearance: Bolted side plates allow roll removal; plan site clearance for roll extraction and tooth-plate replacement