CQ-3KG Coffee Roasters

Technical Selection

Key parameters for matching this machine to your production. Send us your product to freeze, daily output and power supply and our engineers will confirm the right configuration.

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Main Components

• Double-walled or cast-iron roasting drum: Utilizes both conductive and convective heat, reducing the risk of scorching the bean surface.
• Internal drum vanes/agitators: Continuously tumble the bean mass to ensure uniform heat distribution.
• Drum motor and drive system: Provide consistent rotation speed, with support for bi-directional rotation (forward for roasting, reverse for discharging).
• Gas burner heating system: Supplies a stable heat source for the drum exterior and the hot-air system.
• Hot-air fan and ducting: Direct a portion of the heated air into the rear of the drum to facilitate convective heating.
• Exhaust fan and damper: Regulate airflow velocity within the drum and control the rate of exhaust discharge.
• Temperature probes and PID/digital control system: Monitor bean and drum temperatures in real-time, with automatic adjustment of heat output.
• Hopper and feed chute: Used to load green coffee beans into the roasting drum.
• Discharge door/mechanism: Allows for the release of roasted beans into the cooling tray upon completion of the roast.
• Cooling tray and fan: Equipped with an agitation arm to rapidly cool the beans and halt the roasting process.

Working Principle

Hybrid (semi-direct-fire/semi-hot-air) coffee roasters utilize both conductive heat from the drum and convective heat from hot air to roast coffee beans. The heat source warms the outer wall of the drum, while a fan simultaneously draws hot air into the drum’s interior, ensuring the beans are heated evenly as they tumble. Once the equipment is started, the drum and roasting chamber are preheated. After the green beans are loaded, the drum rotates continuously; internal structures—such as vanes or agitators—keep the bean mass in constant motion, which helps prevent localized overheating. During this process, heat is transferred in three ways: conduction (from contact with the drum walls), convection (from hot air circulating within the drum, which also removes moisture), and a degree of radiant heat (from the high-temperature walls of the roasting chamber). As the temperature rises, moisture on the surface of the green beans evaporates, and their color shifts from green to yellow. The beans then undergo the Maillard reaction and caramelization, processes that develop their aroma, sweetness, and flavor compounds. Roasters can control the rate of temperature rise by adjusting the heat intensity, airflow (via dampers), drum rotation speed, and monitoring data from temperature probes. They also use an observation window and a sampling trier to assess the beans' color, the occurrence of "cracks," and the overall progress of the roast. Once the desired roast level is reached, the beans are discharged into a separate cooling tray. A fan and an agitation arm rapidly lower the temperature of the beans, halting the roasting process immediately to prevent residual heat from causing the roast to darken further. Chaff, debris, and smoke generated during roasting are drawn into a collection system via an exhaust setup; this can be connected to external venting ducts to maintain a clean working environment.

Detailed Features

• ▸Hybrid heating system (direct flame + hot air) combines conductive heat from the drum with convective heat from hot air, resulting in a richer, more nuanced flavor profile.
• ▸Drums available in cast iron, carbon steel, or stainless steel; these materials offer stable heat retention and uniform distribution, minimizing the risk of scorched surfaces or under-roasted (raw) centers.
• ▸Internal agitation vanes ensure the coffee beans are constantly tumbled, enhancing consistency across batches.
• ▸Steplessly adjustable hot-air flow allows for precise control over the convection ratio, tailored to specific bean varieties, desired roast levels, and individual stages of the roasting process.
• ▸Dual-PID temperature control with real-time monitoring of both bean temperature and drum (environmental) temperature, providing superior control over the rate of temperature rise.
• ▸Equipped with automatic ignition, flame-out protection, solenoid valves, and pressure gauges to ensure safe operation.
• ▸High-temperature resistant observation window and sampling trier allow for easy monitoring of bean color, crack development, and overall roast progress.
• ▸Dedicated cooling tray featuring a cooling fan and stirring arm; rapidly lowers bean temperature within 1–2 minutes to halt the roasting process immediately.
• ▸Cyclone or drawer-style chaff collection system minimizes dust accumulation and simplifies cleaning.
• ▸Exhaust port allows for the connection of external air purification or afterburner systems to reduce environmental impact from smoke.

Packaging & Shipping

Packed in standard export-grade, fumigation-free wooden crates made of plywood/composite board—no additional fumigation certificate required, facilitating rapid customs clearance. Equipment is secured internally using both nylon strapping and bolts to prevent shifting, swaying, or collisions during transit. Reinforced with external steel banding, the robust structure withstands the pressures of stacking during ocean freight and the rigors of long-distance transport. Metal surfaces are treated with anti-rust coatings and protected by moisture-barrier film and desiccant packs to resist high humidity and salt-spray environments common in ocean shipping. Fragile components (such as sampling scoops, temperature probes, and control modules) are individually wrapped in bubble wrap; a detailed packing list is included. Crates are clearly marked with shipping labels, including consignor/consignee details, port of destination, gross/net weight, dimensions, case numbers, and warning labels such as "FRAGILE" and "THIS SIDE UP." Approximate crate dimensions are 1410 × 1160 × 1510 mm (may vary by specific model); each unit is packed individually. Available for Full Container Load (20GP/40GP/40HQ) or Less than Container Load (LCL) shipments; packing configurations can be optimized based on order volume. Flexible trade terms (EXW, FOB, or CIF) are available to accommodate the client’s specific logistics arrangements. Rigorous quality control (QC) inspections are conducted prior to shipment, with photographs provided before and after container loading to ensure full traceability and delivery quality.

After-Sales Service

Full-Unit Warranty: A 2-year warranty is provided. Any malfunctions resulting from inherent equipment defects during the warranty period will be covered by free repairs or the replacement of original manufacturer parts. Lifetime Maintenance: Ongoing maintenance and technical support are available beyond the warranty period. Spare parts are provided at cost, ensuring the long-term, stable operation of your equipment. Remote Support: We offer remote troubleshooting and operational guidance via WhatsApp, WeChat, email, or video calls, ensuring a rapid response to any issues. On-Site Installation: Depending on the order, we can arrange for engineers to provide on-site installation, commissioning, and parameter calibration, ensuring the equipment is ready for use immediately upon arrival. Operational Training: We provide training on equipment operation, daily cleaning, routine maintenance, and the adjustment of roasting profiles, helping customers get up to speed quickly. Original Manufacturer Parts: We maintain a long-term supply of original components—such as roasting drums, burners, temperature probes, fans, and control modules—to minimize the risk of downtime. Technical Guidance: We provide technical documentation covering installation space requirements, exhaust duct layout, and utility (gas/power) connections, assisting customers in preparing their site. Pre-Shipment Quality Inspection: Every unit undergoes rigorous testing—including assembly, ignition, temperature control, cooling, and continuous roasting trials—before leaving the factory to ensure it is in stable, reliable condition upon delivery. Customization Services: We offer tailored solutions based on your region, including adjustments for voltage, gas supply, certification documentation, and specialized packaging. Spare Parts Recommendations: We can provide a recommended list of spare parts based on your procurement plan, helping to reduce potential wait times for future maintenance.

Frequently Asked Questions