Furnace Structure

1. The furnace shell shall have good temperature resistance, no deformation under long-term use, easy to clean, reasonable and aesthetically pleasing color matching, with no blistering or sagging of paint.
2. The transmission components shall be fully protected to avoid safety risks, with complete electrical protection.
3. The furnace shell structure shall be reasonable to avoid local components (electrical parts, hinges, latches, etc.) from overheating and affecting service life.
4. The furnace door opening shall consider ease of operation and be designed as a flip-open type. The opening angle shall allow easy insertion and removal of the quartz tube, and sealing performance shall be as high as possible to prevent temperature non-uniformity.
5. One observation window shall be installed on the furnace body to observe the rotation status of the quartz tube inside.
6. Within the operating temperature range, the furnace shell surface temperature during heating, soaking, and cooling shall be ≤45℃.

Gas Control System

1. The right end of the furnace core tube shall be equipped with a gas inlet pipe. The furnace tube port shall be equipped with an exhaust hood to prevent gas leakage.
2. No vacuum is required inside the tube. Equipped with flowmeters to control each gas flow rate. Gas inlet flow setting range: 1–30 L/min.
3. Equipped with pressure protection to prevent exhaust port blockage or excessive internal pressure in the furnace tube.
4. Equipped with a gas leak alarm system to prevent gas leakage.
5. A steel frame shall be welded on the outside of the furnace chamber to secure the gas tubes.

Furnace Chamber Structure

1. The furnace lining is made of vacuum-formed high-purity alumina lightweight material. High-wear areas (furnace opening, furnace bottom) use lightweight hollow-sphere alumina board – high service temperature, low heat storage, excellent thermal shock resistance, no cracking, no spalling, good insulation.
2. Three-layer insulation: aluminum silicate fiber board, alumina fiber board, alumina (polycrystalline) fiber board.
3. Two silicon carbide rollers shall be inserted inside the furnace chamber.
4. Insulation material thickness shall be sufficient to avoid heat leakage issues.

Furnace Tube and Roller Structure

1. The furnace tube is a quartz tube with a cover; dimensions as per drawing.
2. The rollers are made of silicon carbide, with clamping rings or diameter reduction welded on both sides to fix the furnace tube and prevent it from moving left/right during rotation; dimensions as per drawing. The silicon carbide rollers shall be procured and assembled by the equipment supplier.
3. The quartz tube shall be a high-temperature-resistant sand-cast tube that allows powder tumbling to avoid sticking and agglomeration.
4. The quartz tube is placed inside a silicon carbide/silicon nitride composite tube to prevent softening and deformation of the quartz tube at high temperatures.

Rotary Transmission Structure

1. A rotary transmission structure shall be provided on one side of the furnace body to drive the two silicon carbide rollers (both are driving rollers). The rollers rotate and drive the internal quartz tube. The transmission method shall ensure minimal radial force on the silicon carbide rollers to avoid cracking due to radial force, which would affect service life.
2. The motor shall be a variable frequency motor, adjustable 1–5 r/min, with forward/reverse rotation capability.

Control System

1. The temperature control process can store 5 or more recipes, each containing 30 or more temperature segments, with online editing capability.
2. The temperature control system shall have continuous PID adjustment, thermocouple failure alarm, over-temperature alarm, real-time power display, temperature compensation setting, temperature real-time monitoring, temperature curve recording, and historical data export.
3. The control panel can be touch screen or keyboard/mouse type.
4. Equipped with automatic power consumption calculation – automatically calculates power consumption per batch.

Refractory Material

1. The furnace lining is made of vacuum-formed high-purity alumina lightweight material. High-wear areas (furnace opening, furnace bottom) use lightweight hollow-sphere alumina board – high service temperature, low heat storage, excellent thermal shock resistance, no cracking, no spalling, good insulation.

Insulation Material

1. Three-layer insulation: aluminum silicate fiber board, alumina fiber board, alumina (polycrystalline) fiber board – energy saving >80% compared to traditional furnaces.

Furnace Outer Shell Temperature

1. Under continuous long-term operation, the outer shell temperature is <45℃.

Protections

1. Integrated modular control unit with high accuracy. Dual-loop control and dual-loop protection, including protections against overshoot, over-regulation, under-regulation, broken thermocouple, phase loss, overvoltage, overcurrent, overtemperature, current feedback, soft start, etc.

Control Method

1. Closed-loop SCR (thyristor) module triggering – phase-shift or zero-crossing control. Continuous adjustment of output voltage, current, or power with constant voltage, constant current, or constant power characteristics. Inner current loop and outer voltage loop – limits output current within rated range under sudden load or overcurrent conditions, ensuring stable operation and protecting heating elements from excessive current/voltage surges, achieving safe and reliable control and high accuracy.

Displayed Parameters

1. Temperature, segment number, segment time, remaining time, output power percentage, voltage, current, etc.

Pushbuttons

1. Imported pushbuttons with >100,000 cycles life and LED indicators.

Temperature Profile Setting

1. Intelligent temperature controller with standard PID, APID, or MPT regulation modes. Auto-tuning, self-learning, excellent control without overshoot/undershoot. 30-segment programmable control, arbitrary ramp/soak profiles, with jump (cycle), run, pause, stop commands. Program can be modified during operation. AI algorithm with curve fitting for smooth and accurate profile tracking.

Heating & Temperature Control System

1. Capable of continuous operating temperature of 1250℃, maximum temperature 1300℃. Process cycle is batch-type: room temperature heating → soaking for 2–8 h → cooling to room temperature.
2. Heating rate adjustable: maximum 10℃/min, minimum 1℃/h.
3. Three or more temperature zones. The length of the temperature zones shall ensure a uniform temperature zone length of ≥1.3 m. Temperature uniformity within the uniform zone during soaking: ±5℃; temperature control accuracy: ±1℃.
4. Heating elements in the furnace chamber shall be silicon carbide rods, arranged in parallel (around or top/bottom) with single-side wiring for easy installation and replacement.
5. Temperature control system shall use SCR voltage regulation.
6. Temperature measurement thermocouple shall be type S. One additional separate thermocouple shall be provided for intermittent measurement of the temperature inside the uniform zone of the quartz tube during soaking to calibrate the temperature compensation value.

Others

1. Provided with the equipment: one set of installation requirements (water, electricity, gas, floor, etc.), one certificate of conformity, one equipment manual, one operation manual, one set of electrical drawings (schematic, terminal layout with annotations), one CAD assembly drawing, one spare parts list (with prices), one maintenance manual, one list of standard component brands and models, one packing list, and one factory inspection report.
2. The electrical cabinet shall be equipped with fans for cooling. Wiring shall be properly organized with cable ducts – no loose or random wiring.
3. Provided with the equipment: one pair of crucible tongs, one pair of high-temperature gloves.