MUFFLE FURNACE

 GWDL-XL Box Furnace Product Introduction and Technical Data  

一、

Product Name: Resistance Furnace / Box Furnace / Muffle Furnace 电炉/马弗炉

Contact : Wang Guoqing, Tel: 15637962277, Email: sales@gwdl.com

二、

Model：GWDL-XL

Specifications: 1200, 1400, 1600, 1700, 1800 degrees

三、

Product Description

The GWDL-XL series high-temperature furnace integrates the control system with the furnace chamber as shown in the figure. The furnace lining is made of vacuum-formed high-purity alumina light material. Using high-temperature electric heating elements, it is specially designed for universities, research institutes, laboratories, and industrial and mining enterprises to perform sintering, melting, analysis, and production of ceramics, metallurgy, electronics, glass, chemicals, machinery, refractory materials, new material development, special materials, building materials, metals, non-metals, and other compound materials. | | | The control panel is equipped with an intelligent temperature regulator, power switch, main heating work/start-stop button, voltage, current meter, computer interface, observation port/inlet valve, to observe the working status of the system at any time. This product uses reliable integrated circuits, has a good working environment, and is anti-interference. When reaching the highest temperature, the shell temperature does not exceed 45°C, significantly improving the working environment. Microcomputer program control, programmable curves, automatic heating/cooling, can modify temperature control parameters and programs during operation, flexible and easy to operate.

四、

Technical Parameters

Highest Operating Temperature

1200℃

1400℃

1600℃

1700℃

1800℃

Long-term Operating Temperature

1150℃

1350℃

1550℃

1680℃

1780℃

Temperature Control Range

100-1200℃

100-1400℃

100-1600℃

100-1700℃

100-1701℃

Temperature Control Accuracy

±1℃

±1℃

±1℃

±1℃

±2℃

Temperature Measurement Element

k

S

B

B

B

Heating Element Material

High-temperature alloy resistance wire

Silicon carbide rod

Silicon molybdenum rod

Type 1800 silicon molybdenum rod

Type 1801 silicon molybdenum rod

Installation Position of Heating Elements

Three-sided heating, sides plus bottom

Top/bottom or sides

sides

sides

sides

Maximum Heating Rate

Maximum heating rate of 40°C/min (non-linear)

Structure and Material of the Furnace Body

The furnace body adopts advanced air-cooled double-layer carbon steel structure, effective air-cooled guide plates allow overall circulation of cold air within the shell, finally cooling the conductive sheets of the heating elements before exiting the furnace body, preventing high-temperature oxidation of the conductive sheets of the heating elements; ensuring a good working environment.

Door Opening Method

The door opening method is axial 180-degree side opening plus 360-degree rotation, the door lock is located on the side of the door and is equipped with an elastic lock that can effectively lock the door. The elasticity of the lock absorbs the expansion of the refractory material, ensuring free thermal expansion and contraction of the refractory material while providing effective sealing.

Refractory Insulation Material

The furnace lining is made of vacuum-formed high-purity alumina light material, has a high operating temperature, small heat storage capacity, is resistant to rapid heating and cooling, does not crack or drop slag, and has excellent insulation properties.

Shell Temperature

Shell temperature less than 45°C

Safety Protection

Uses an integrated module control unit with accurate control precision, and designs dual-loop control and protection, which includes overshoot, undershoot, segmental failure, phase loss, overvoltage, overcurrent, overtemperature, current feedback, soft start, etc.

Door Open Cut-off

The furnace is designed to disconnect the main heating circuit when the door is opened at high temperatures during operation, greatly protecting against electrical shock risk when handling high-temperature materials.

Safe Temperature Control

Uses closed-loop technology thyristor module triggering control, phase angle triggering control or zero-crossing triggering method, output voltage, current or power continuously adjustable, has constant voltage, constant current or constant power characteristics; the current loop is the inner loop, the voltage loop is the outer loop, when there is a sudden load increase or the load current exceeds the limit value, the output current of the voltage regulator is limited to the rated current range, ensuring normal operation of the output and voltage regulator; the voltage loop also participates in regulation, limiting the output current of the voltage regulator to the rated current range under conditions of sufficient regulation margin, maintaining constant output current and voltage under such circumstances; thus protecting the heating elements from excessive current and voltage surges, achieving safe and reliable control effects and control accuracy.

Temperature Curve Setting

Uses an intelligent temperature control instrument with standard PID, artificial intelligence regulation APID or MPT and other types of adjustment methods, having self-tuning and learning functions, no overshoot or undershoot characteristics, equipped with 30-segment program control function, can realize any slope of heating and cooling control, has jump (cyclic), run, pause and stop commands that can be programmed/operated, allows modification of the program during controlled operation; using artificial intelligence adjustment algorithms with curve fitting capabilities, smooth and even curve control effects can be obtained.

Number of Heating Curve Segments

50-segment program control function, can be set to input: one curve is 50 segments, two curves are 28 segments each, three curves are 15 segments each, five curves are 9 segments each; multiple curves can be entered simultaneously, can be used arbitrarily during use.

Panel Buttons

Two buttons respectively: Main power button/knob, heating chamber connection button/knob.

 Standard Accessories

Tongs, one pair of high-temperature gloves.

五、

Warranty Scope and Period

The electric furnace is free under warranty for one year, the furnace bottom plate is not under warranty, the heating elements are not under warranty (free replacement if naturally damaged within three months).

六、

Packaging List

Electric furnace one unit, tongs one pair, high-temperature gloves one pair, furnace bottom support plate one piece, manual one copy, certificate of conformity one copy, acceptance report (factory inspection report) one copy, sales delivery note one copy.

七、

Precautions

1. To prevent affecting the service life of the electric furnace, it is recommended to keep the maximum heating rate and cooling rate between 1-15°C/min (heating element life will shorten if heated too quickly at high temperatures).

2. This box furnace does not have a vacuum sealed structure, so flammable and explosive gases should not be introduced.

3. After a period of use, minor cracks may appear in the furnace chamber, which is normal and will not affect usage; these can be repaired using an alumina coating.

4. It is not recommended to introduce corrosive gases; if strong corrosive gases like sulfur (S) or sodium (Na) need to be introduced, please inform us in advance so we can provide special treatment for the furnace chamber.

5. High-temperature solutions must not leak onto the furnace bottom; preventive measures include using a support plate or alumina powder for isolation.

6. The instrument should be placed in a well-ventilated area, away from dampness.

八、

Shipping Matters

1. The packaging of the electric furnace consists of three layers: wrapped in sponge paper, then wrapped with plastic film, and finally packed in a wooden box.

2. Free domestic delivery to the doorstep (free delivery within city limits).

3. We bear any damage to the electric furnace during transportation.

4. Logistics methods: by truck, railway, ship (for export), air freight (for export); for shorter distances, our company dispatches a dedicated vehicle (packaged in wooden pallet plus cardboard box).

九、

Optional Add-on Function List

 Name

Function Description

Temperature Controller

Standard with 50-segment heating curve, optional import instruments (B)

two options, choose one

Touchscreen

Chinese menu, multiple heating process curve storage, storage of historical curves and data reports (7-inch).

four options, choose one

IoT Interface

RS485 communication interface for the furnace to read/write furnace startup, pause, stop, heating curve, allowable time, etc., real-time data

Computer Control Software and Hardware

Can control furnace startup, pause, stop, heating curve setting, heating curve reading, parameter setting, etc., via computer; high reliability, easy to master; measurement values, set values, output values, duration, segment number, heating curve, power percentage curve can be stored via computer, modified set values and commonly used parameters, historical curves, historical report recording intervals can be selected (1s-1h) and saved long term.

PLC

Siemens PLC control (read/write furnace startup, pause, stop, heating curve, time, temperature curve, atmosphere, flow, switching quantities, power supply, power) open port for serial/parallel data with upstream/downstream equipment

Observation Port

Observation port designed on the furnace door, using high-temperature resistant quartz glass

Inlet Valve

A floating ball flow meter along with a manual valve; the number of flow meters, maximum production capacity, and selectable gas media.

two options, choose one

A digital display mass flow meter; the number of flow meters, maximum production capacity, and selectable gas media.

Exhaust Valve

Exhaust valve, manually opened; DN30

two options, choose one

Electrically operated, automatically opens or closes according to the heating curve in N segments.

Automatic Inlet and Exhaust

Electric exhaust valve and electric inlet valve can be associated with heating curve segments to automatically open/close at any temperature segment during heating process (premise is selecting touchscreen function)

Mobile Casters

| Two swivel casters, two fixed casters

Rapid Cooling

Uses frequency converter plus centrifugal fan to achieve programmable cooling

Electric Upward Opening Door

Electric upward opening door + foot pedal control board

Multi-point Temperature Control

Standard with heating on both sides; additional independent temperature control for furnace door, furnace bottom, back side, furnace top, etc., to improve uniformity of furnace temperature

Stirring Fan

Metal stirring fan within 1050°C - 4000; frequency converter - 1500-2000; PLC with automatic start/customization by temperature segment - 4000

Independent Control Cabinet

Control separated from the furnace body, add independent control cabinet (1600x600x400) and increase control cable length (within 5 meters)

 Heat Storage Furnace Bottom

Furnace bottom sunken 50mm hollowed out, multiple supports added to increase support plate, cost increases by 5%.

Waste Gas Treatment

Add VOC waste gas treatment furnace 40m³/H; 80m³/h

Corrosion-resistant Furnace Chamber

Corrosion-resistant furnace chamber material against acids, alkalis, and hydrofluoric acid

Heating Element Protection

Heating element comes with protection to prevent contamination by powders and corrosion by volatiles, etc.

Clean Furnace Chamber

Furnace chamber uses ceramic, high-temperature glass, high-temperature metal, etc., to prevent dust and volatiles, etc. |