Roller Hearth Kiln

Technical overview

Designed around the complete thermal process.

Roller Hearth Kiln is a HuanYu roller hearth kilns system for continuous firing, glass annealing, ceramic sintering, roller-hearth processing. Published configuration references include Up to 1000 °C and Air or controlled thermal processing. Final selection depends on the material, workload, process window and selected configuration.

Key technical facts

• +Temperature reference: Up to 1000 °C
• +Environment reference: Air or controlled thermal processing
• +1. Equipment overview The roller kiln (roller bottom kiln) is a continuous tunnel heat treatment electric furnace. It relies on high-temperature ceramic rollers to continuously transport workpieces, and the materials automatically enter from the kiln head. Preheating, heating, constant temperature sintering, and air cooling are completed in turn, and the entire production process is uninterrupted. This introduction introduces the RGK180-77 single-layer 18-meter electric roller kiln, which is mainly used for continuous annealing, sintering, and brazing of glass, inorganic refractories, and small ceramic parts. It is fully automated and unattended, and is suitable for mass production. II. Core basic parameters Dimensions Specifications Total furnace length 18000 × width 770 × height 200mm; overall machine shape 19000 × 1200 × 1450mm Sectional structure: feeding section 1m, heating buffer 1m, heating 1m, constant temperature 6m, air cooling cooling 7m, cooling buffer 1m, discharging 1m Temperature index standard constant temperature use temperature 1000 ℃, constant temperature is divided into 10 independent temperature control zones, single zone length 1m; temperature difference between constant temperature sections ≤ ± 6 ℃; total process board length 2 ~ 4 hours can be adjusted, standard 4 hours cycle, board speed 1400mm/h. Electrical power Three-phase 380V/50Hz, total installed power 150kW; steady state thermal insulation power consumption of about 65kW. Roller conveying ceramic roller Φ60mm, a total of 90 (including 10 spare parts), roller spacing
• +120mm; 3 sets of 0.37 kW variable frequency reducer motors, universal joint double support transmission, can be reversed, anti-deviation. Cooling and exhaust 7 meters lengthen the air-cooled section, the surface temperature of the discharged product is ≤ 55 ℃; 4 groups of top heating exhaust + 2 groups of cooling area exhaust, 3 sets of 5.5kW stainless steel exhaust fans, and the pipeline is fully SUS304 anti-corrosion. 3. Seven major system structures of the whole machine 1. Kiln body insulation furnace body flat top layered furnace, side wall/bottom lightweight refractory brick, kiln roof ceramic fiber ceiling; composite insulation layer heat storage is small, low heat dissipation; integral steel plate frame, the outer wall is sprayed with high-temperature resistant silver powder paint, sealed partition, cold and hot intervals do not string temperature to each other. 2. The 10-zone independent heating system heats the upper and lower double-sided spiral resistance wires in each temperature zone, and the N-type thermocouple independently measures the temperature; the single-zone SCR silicon controlled closed-loop PID temperature control, soft start, current limiting protection, and current voltage real-time collection and storage; zoned temperature control, the power of each zone can be adjusted individually to adapt to complex heating curves. 3. Roller conveying transmission system Ceramic roller dual ceramic support wheel structure, no metal impurity pollution; universal joint connection, stable operation without jam; variable frequency stepless speed regulation, flexible adjustment of discharging speed according to sintering process, with front and rear limit protection. 4. The heating section of the exhaust gas treatment and exhaust system forces the decomposition of water vapor and organic matter in the blank, and the cooling section assists in ventilation;
• +All exhaust ducts are made of stainless steel, resistant to acid volatile corrosion, and exhaust gas is concentrated. 5. The air-cooled cooling system extends the 7-meter air-cooled partition, multi-layer partition buffer, stepped cooling to avoid rapid cold cracking of the workpiece; the finished product discharge temperature is controlled within 55 °C, and can be directly discharged and sub-packaged. 6. Automatic intelligent electronic control system 10-inch Kunlun on-state touch screen + Siemens PLC, classified operation password authority; functions: real-time temperature curve, motor frequency, fan speed, fault alarm record; process data can be exported to Excel archive, support 485/Ethernet communication, can be docked with factory central control; equipped with independent temperature control cabinet, UPS uninterruptible power supply, Schneider full set of low-voltage electricity. 7. Multiple interlock alarm over-temperature, thermocouple disconnection, motor overcurrent, frequency converter failure, running timeout acousto-optic three-color alarm, abnormally automatically cut off the heating power supply. Fourth, the core product advantage continuous production line, the production capacity is different from the intermittent production of trolley furnaces and box furnaces, and the 24-hour uninterrupted feeding and discharging is suitable for large-scale mass production, and the cost of single-piece heat treatment is greatly reduced. The multi-segment fine-tuning of the constant temperature section with an independent precision temperature control length of 6 meters in the 10th zone, the temperature difference of the whole batch of workpieces is small, the consistency of sintering and annealing is high, and the defective rate is low. Full ceramic roller is free of metal pollution corundum ceramic roller, no iron, chromium impurities precipitation, suitable for glass, high purity ceramics, optical materials. Energy-saving and lightweight insulation
• +Lightweight refractory brick + fiber composite lining, low empty furnace loss, steady-state insulation power of only 65kW, long-term production power saving. The whole process of automatic feeding — heating — constant temperature — cooling is fully automatic, no manual duty is required, the process curve is stored, and the repeatability is strong. Environmentally friendly waste gas centralized treatment, corrosion-resistant stainless steel piping, suitable for sintering of volatile-containing blanks. V. Typical applicable industries Process glass industry: annealing of glass products, tempering pretreatment, and sintering of crystalline glass; electronic ceramics: continuous element sintering of MLCC, piezoelectric ceramics, and small ceramics; refractory/inorganic materials: calcination of alumina, zirconia powder, and small refractories; continuous air sintering of powder metallurgy small parts, cemented carbide, and magnetic materials; air brazing and stress relief annealing of small metal parts.