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Luoyang Juxing Kiln Co., Ltd. (GWDLTHERM) has introduced a new intermittent rotary furnace designed for controlled high-temperature processing of powders, ceramics, refractory materials, glass-related materials, and other specialized products.
The newly developed furnace combines a rotary quartz tube, multi-zone silicon carbide heating, programmable temperature control, and adjustable rotation to provide stable and repeatable thermal processing. The system is designed for intermittent production cycles, allowing materials to be heated from room temperature, held at the required temperature for 2–8 hours, and then cooled back to room temperature.
With an operating temperature range of 1200°C to 1400°C, the furnace is particularly suited to applications requiring controlled powder movement and uniform thermal exposure during high-temperature processing.
The furnace uses a capped quartz tube supported by silicon carbide rollers. Retaining rings or variable-diameter roller structures help prevent lateral movement of the quartz tube during rotation.
Inside the quartz tube, tilting plates are installed at 90° intervals using staggered welding. During rotation, these plates continuously lift and turn the powder, improving material agitation and reducing powder accumulation, adhesion, and clumping.
The roller structure can also be designed with adjustable spacing, allowing the equipment to accommodate potential changes in quartz tube diameter and providing greater flexibility for future process requirements.
A dedicated rotary drive system is installed on both sides of the furnace. Friction transmission is used to drive the silicon carbide rollers and rotate the internal quartz tube.
The transmission structure is designed to minimize excessive radial loading on the silicon carbide rollers, helping reduce the risk of cracking and supporting reliable long-term operation.
The furnace uses variable-frequency motors with adjustable rotation speeds from 1–5 rpm. Forward and reverse rotation can be selected according to material processing requirements.
Two independent rotary drive systems can operate separately, while the transmission components on both sides work synchronously to maintain stable quartz tube rotation.
The furnace is equipped with three or more independently controlled temperature zones. The heating system is designed to provide a uniform-temperature zone of at least 1.3 m inside the quartz tube.
During the constant-temperature stage, temperature uniformity within the effective uniform zone can be maintained within ±5°C, while temperature control accuracy can reach ±1°C.
Silicon carbide rods are used as heating elements and arranged around the furnace or along the upper and lower sections. The single-side wiring configuration facilitates installation, maintenance, and replacement.
The temperature control system uses SCR voltage regulation to provide stable heating power adjustment.
The furnace supports adjustable heating rates from a maximum of 10°C/min to a minimum of 1°C/h. This wide adjustment range allows users to configure heating profiles according to different material properties and process requirements.
The control system can store five or more thermal processing programs, with each program containing at least 30 temperature segments. Programs can also be edited online to provide greater flexibility during production and testing.
Temperature control functions include continuous PID regulation, thermocouple failure alarms, over-temperature protection, real-time power monitoring, temperature compensation, and temperature curve recording.
Historical process data can be exported for production tracking, process analysis, and quality management. The system can also automatically calculate power consumption and record the electricity used for each furnace cycle.
S-type thermocouples are used for temperature measurement in the high-temperature system. In addition to the primary temperature measurement points, an independent thermocouple is provided for intermittent measurement of the uniform-temperature zone inside the quartz tube during the constant-temperature stage.
This independent measurement can be used to verify the actual temperature inside the processing zone and calibrate temperature compensation values, helping improve process consistency and temperature accuracy.
The furnace body is designed with a heat-resistant structure to reduce deformation during long-term high-temperature operation. The overall structure also considers the thermal protection of electrical components, hinges, fasteners, and other external components.
The furnace can be equipped with observation windows to allow operators to monitor the rotation condition of the quartz tube during operation.
The internal lining uses vacuum-formed high-purity alumina lightweight insulation materials. Areas exposed to frequent material handling, such as the furnace opening and bottom, use lightweight hollow alumina plates.
The multi-layer insulation structure combines alumina-silicate fiberboard, alumina fiberboard, and polycrystalline alumina fiberboard. The insulation system is designed to reduce heat loss, thermal storage, and external surface temperature.
During heating, holding, and cooling within the specified operating range, the furnace shell surface temperature is designed to remain at or below 45°C.
The furnace is suitable for ceramic powder processing, refractory material treatment, and high-temperature sintering processes where controlled powder movement and uniform heating are important.
The controlled rotary structure can support thermal processing of electronic materials, glass-related materials, and chemical materials requiring adjustable heating rates and stable high-temperature conditions.
The furnace can also be configured for selected metal and non-metal material processes where controlled rotary movement, programmable heating, and extended constant-temperature treatment are required.
The combination of rotary material agitation and multi-zone heating provides a more controlled thermal environment than a stationary batch structure for processes where powder movement is important.
Its adjustable 1–5 rpm rotation, forward/reverse operation, and configurable roller spacing provide flexibility for different quartz tube and material processing requirements.
The programmable control system supports multiple thermal recipes, multi-segment temperature profiles, real-time monitoring, historical data recording, power consumption calculation, and safety alarms.
The furnace also provides practical maintenance advantages through its silicon carbide heating elements, single-side wiring arrangement, accessible rotary drive structure, and configurable quartz tube support system.
To support installation, operation, and long-term maintenance, GWDLTHERM can provide equipment installation requirements, certificates, operating and maintenance manuals, electrical drawings, CAD assembly drawings, spare-parts lists, standard component information, shipping lists, and factory inspection reports.
The equipment can also be supplied with accessories including a crucible tong, high-temperature gloves, and spare silicon carbide heating rods.
The launch of this intermittent rotary furnace further expands GWDLTHERM's range of high-temperature thermal processing equipment. By combining rotary material handling, multi-zone heating, programmable control, and process monitoring, the new furnace is positioned as a flexible solution for specialized batch thermal processing.
Luoyang Juxing Kiln Co., Ltd. will continue developing high-temperature electric furnace technologies and application-oriented thermal processing equipment for customers in ceramics, refractory materials, electronics, glass, chemicals, and advanced materials.
The new intermittent rotary furnace demonstrates GWDLTHERM's continued focus on combining furnace engineering, temperature control, mechanical transmission, and material-processing requirements into integrated high-temperature equipment solutions.
