Small Liquid Nitrogen Cryogenic Grinder with Vibratory Feeder for Laboratory Sample Preparation

Product Overview

This advanced cryogenic grinding system uses liquid nitrogen to instantly chill and embrittle materials that are otherwise too tough or heat‑sensitive for conventional pulverizers. By maintaining ultra‑low temperatures during the entire comminution cycle, it prevents thermal degradation, ensures particle size uniformity, and preserves the chemical integrity of the sample—critical for accurate analytical results in material science and quality control.

The unit is purpose‑built for laboratories needing to process small batches (from as little as 10 g up to 3 kg per hour) of polymers, elastomers, waxes, or biological tissues. Its independently controlled vibratory feeder delivers a steady, adjustable material stream for continuous operation, while a secondary manual feeding port caters to single‑sample testing. The screenless air‑classification design eliminates mesh binding and accelerates throughput.

Built around a rugged all‑in‑one stainless steel frame, this machine integrates the grinding head, cyclone separator, liquid nitrogen delivery circuit, and digital controls into a compact benchtop footprint. Engineering features such as a motor‑cooling path that redirects vaporized nitrogen and robust low‑temperature fluororubber seals ensure reliable, maintenance‑friendly performance even under round‑the‑clock use in high‑throughput labs.

Key Features

• Integrated All‑in‑One Design: The main crusher, collection cyclone, feeding mechanism, liquid‑nitrogen connections, and electrical controls are housed in a single 304 stainless steel enclosure. This space‑saving layout not only protects components from dust and spillage but also reduces setup time—simply connect the LN₂ dewar and start grinding.
• Flexible Liquid Nitrogen Delivery: The system supports a foot pump for intermittent small‑sample runs and an electric pump for sustained batch processing. For users requiring the highest precision, an optional intelligent liquid nitrogen pump can be retrofitted, offering programmable LN₂ flow control that eliminates guesswork and ensures exact replication of grinding conditions.
• Adjustable Fineness with Vortex Ring: A calibrated vortex ring permits stepless adjustment of the grinding gap, yielding final particle sizes from coarse 40 mesh down to ultrafine 350 mesh. A scale valve on the LN₂ input quantifies coolant flow, giving users a reproducible freezing regime that can be logged in standard operating procedures.
• High‑Speed Impact & Screenless Air Classifier: The 25,000 rpm rotor subjects cryogenically hardened particles to intense impact and shear. The screenless air classifier then uses the rotor’s own airflow to carry only particles that have reached the target size into the collection bag, continuously removing fines while rejecting oversized grains for re‑grinding. The result is a narrow, controllable particle size distribution and a clog‑free workflow.
• Durable Low‑Temperature Seals: Custom‑formulated fluororubber seals resist embrittlement at cryogenic temperatures, dramatically extending seal service life compared to conventional elastomers. This reduces the frequency and cost of maintenance, keeping the machine operational with minimal interruptions.
• Dual‑Purpose Grinding Chamber: When liquid nitrogen cooling is not required, the grinding head can be isolated and used as a stand‑alone ultra‑micro pulverizer for hard, brittle, or fibrous materials at ambient temperature. This dual functionality means research groups can cover both cryogenic and conventional grinding with a single capital investment.
• Independent Motor Cooling Circuit: A built‑in axial fan draws cold nitrogen vapor exhaust across the motor housing before it exits the system. This engineered secondary cooling path keeps the motor temperature low during extended runs, preventing thermal derating and prolonging the motor’s operational life.
• Vibratory Feeder with Manual Port: A dedicated vibratory feeder with an independent speed controller promotes consistent material flow for bulk samples. For small quantities—as low as 10 g—the lateral manual intake port provides an alternative that avoids material loss and cross‑contamination between samples.
• Comprehensive Safety & Accessory Kit: Safety features include an overload circuit breaker, emergency‑stop button, and a digital display that continuously monitors voltage and current. The system ships with a mobile Dewar trolley, cryogenic gloves, a sample basket, safety goggles, and a lockable pump case, so operators have everything needed for immediate, safe operation.

Applications

Technical Specifications

Why Choose This Product

• Proven Cryogenic Engineering: The system is built around a time‑tested impact‑rotor design refined with user feedback, delivering years of dependable service in demanding laboratory environments. Every component, from the motor to the LN₂ circuit, is selected for long‑term durability.
• Precision Particle Control: The unique combination of an adjustable vortex ring, scale‑valve LN₂ delivery, and variable‑speed vibratory feeder gives the operator unmatched command over final particle size. This translates to narrower size distributions and more reproducible analytical results.
• Optimized for Continuous Operation: Smart thermal management—including the motor’s nitrogen‑vapor cooling path and screenless discharge—allows non‑stop processing without overheating. The low‑temperature fluororubber seals further reduce downtime by eliminating frequent seal changes.
• Versatile and Future‑Ready: With dual feeding modes, an optional intelligent LN₂ pump, and the ability to serve as a stand‑alone ultra‑micro grinder, this unit adapts as your research evolves. The compact, integrated footprint also saves valuable bench space.
• Rapid Return on Investment: The system’s dual‑use capability, low consumable requirements, and robust construction minimize total cost of ownership. Reduced seal replacements and energy‑efficient motor cooling translate into long‑term savings that justify the initial purchase.
• Comprehensive Support: Backed by a dedicated technical team with deep expertise in cryogenic grinding, we offer application advice, maintenance training, and prompt after‑sales service to keep your lab running smoothly.

Contact us today to discuss your sample preparation needs and receive a customized quotation. Our engineers can tailor the system—including dewar size, pump type, and accessories—to match your specific material and throughput requirements.