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- gwdlthermo@gwdl.com
The GWL-1700R2 frit furnace is specifically designed for the research and development of optical glass and ceramic grinding wheel binders. It is equipped with a 17L zirconium quartz crucible and a stirring system, featuring heating from all around and the bottom. The furnace supports direct feeding via a charging funnel along with flow control, making it suitable for high-temperature melting needs in scientific research and industrial applications.
| Temperature | 1700℃ |
| Model | GWL-1700R2 |
| Crucible Material | Zircon quartz |
| Crucible Volume | 17L |
| Overall Dimensions | 1400*1370*2150 |
| Designed Power | 45KW; power is automatically adjusted according to heating rate, with current limiting function |
| Power Supply (AC) | Three-phase four-wire 380V |
| Maximum Operating Temperature | 1700℃ |
| Long-term Operating Temperature | 1680℃ |
| Control Range | 80 to 1700℃ |
| Temperature Measuring Element | Platinum-rhodium B thermocouple, measuring range 0-1820℃ |
| Installation Position of Heating Elements | Around and at the bottom of the crucible |
| Temperature Control Precision | ±1℃ (integrated circuit control, no overshoot phenomenon) |
| Furnace Temperature Uniformity | ±1.5℃ |
| Heating Rate | Freely adjustable, with a range of 1℃/h (slowest) to 40℃/min (fastest) |
| Heating Elements | Imported U-type 1800 molybdenum disilicide rods. Molybdenum disilicide rods are resistance heating elements based on molybdenum disilicide, with a surface temperature of 1800℃. When used at high temperatures in an oxidizing atmosphere, a bright and dense glass film is formed on the surface, which can protect the rods from oxidation. Therefore, molybdenum disilicide rod elements have high-temperature oxidation resistance. Under normal operating conditions, the resistance of the elements generally does not change with the length of use, so new and old components can be mixed. |
| Furnace Body | Processed by CNC machine tools, manufactured through polishing, grinding, pickling, phosphating, plastic powder spraying, high-temperature baking, etc. It features a two-color design with a novel and beautiful appearance, and has advantages such as oxidation resistance, acid and alkali resistance, corrosion resistance, high-temperature resistance, and easy cleaning, meeting export standards with mirror baking paint. |
| Furnace Body Structure | The electric furnace body adopts an air-cooled double-layer structure; air-cooled guide partitions enable overall cold air circulation in the furnace shell, which finally cools the conductive sheets of heating elements before being discharged out of the furnace body, avoiding high-temperature oxidation of the conductive sheets. |
| Crucible Inlet/Outlet Mode | The crucible can be taken out by lowering the lifting cart when replacing. |
| Loading | The electric furnace is designed with a loading hopper; materials can be directly loaded by opening the hopper. |
| Flow Control | The electric furnace adopts dual temperature control heating; the outflow time of the solution can be controlled by adjusting the temperature of the discharge port. |
| Cooperation between Lower Heating and Furnace Refractories | The lower heater and the refractories of the loading platform adopt step cross-sealing; the refractories have angles both upper and lower parts. The opening angle of the loading platform is large, and gradually reduces as the platform closes. |
| Refractory Materials | The furnace lining uses German MESCHUPP vacuum-formed high-purity alumina fiber lightweight boards; the easily collision positions (furnace bottom) during material taking and placing adopt high-purity lightweight hollow sphere alumina boards, featuring high operating temperature, low heat storage, resistance to rapid heating and cooling, no cracks, no slag dropping, and good insulation performance. |
| Insulation Materials | Three layers of insulation are used: high-alumina cotton, alumina fiberboard, and alumina (polycrystalline) fiberboard; the easily collision position at the furnace mouth uses high-purity lightweight special-shaped alumina materials. |
| Furnace Shell Temperature | The shell temperature is ≤45℃ during long-term continuous operation. |
| Protection | Adopts integrated module control unit with good control precision, designed with dual-loop control and protection, featuring overshoot, undershoot, thermocouple break, phase loss, overvoltage, overcurrent, overtemperature, current feedback, and soft start protection. |
| Dual Control | Adopts two sets of closed-loop thyristor module trigger control with phase-shift trigger mode; output voltage, current, or power is continuously adjustable, with constant voltage, constant current, or constant power characteristics. The current loop is the inner loop, and the voltage loop is the outer loop. When the load is suddenly applied or the load current exceeds the current limit, the output current of the regulator is limited within the rated current to ensure the normal operation of the output and regulator. At the same time, the voltage loop also participates in regulation, so that the output current of the regulator is limited within the rated current, and the output current and voltage are maintained constant under the premise of sufficient regulation margin, thus protecting the heating elements from excessive current and voltage impact and ensuring control effect and precision. |
| Temperature Curve Setting | Adopts intelligent temperature controller with multiple regulation modes such as standard PID, artificial intelligence adjustment APID or MPT, featuring self-tuning and self-learning functions, excellent control characteristics without overshoot or undershoot, with 30-segment program control function, enabling arbitrary slope heating and cooling control, with programmable/operable commands such as jump (cycle), run, pause, and stop, and allowing program modification during operation. It uses artificial intelligence adjustment algorithm with curve fitting function to achieve smooth curve control effect. |
| Multiple Curve Input | 30-segment program control function: 30 segments for one curve, 14 segments each for two curves, 9 segments each for three curves, 5 segments each for five curves; multiple curves can be input simultaneously and called arbitrarily during use. |
| Communication Interface | The electric furnace is equipped with an RS485 communication interface with a communication distance of up to 1000 meters. It can be centrally controlled via a touchscreen for starting, pausing, stopping, setting heating curves, reading heating curves, and parameter adjustment. The computer display is rich in content, showing measured value, set value, output value, segment time, segment number, heating curve, and power percentage curve. Heating curves can be stored in the computer and called arbitrarily; set values and common parameters can be modified. Historical curves and reports can be saved for a long time with selectable time intervals (1s-1h). |
| Random Accessories | 2 heating elements, 2 sets of rod tools, 1 pair of crucible tongs, 1 pair of high-temperature gloves, 1 DVD data disk (software, electronic manual, video tutorial). |
| Warranty Scope and Period | The electric furnace is covered by a 1-year free warranty; heating elements are not covered (free replacement for natural damage within three months). |
| Optional Accessories | Touchscreen-controlled centralized temperature controller; the electric furnace is equipped with discharge buzzer indicator and furnace loading buzzer indicator. |
| Notes | 1. To avoid affecting the service life of the electric furnace, it is recommended that the maximum heating and cooling rate be 10-20℃/min (excessively fast heating will shorten the service life of heating elements). 2. This trolley furnace has no vacuum-sealed structure, so flammable and explosive gases must not be introduced. 3. After using the electric furnace for a period of time, tiny cracks may appear in the furnace chamber, which is a normal phenomenon and will not affect use. It can be repaired with an alumina coating. 4. It is not recommended to introduce corrosive gases. If strong corrosive gases such as S and Na need to be introduced, please inform us in advance, and we will perform special treatment on the furnace chamber. 5. High-temperature solutions must not leak onto the furnace bottom; a backing plate or alumina powder can be used for isolation to avoid this. 6. The instrument should be placed in a well-ventilated and dry place. |
| Name | Specification Model | Standard Crucible Material | Overall Dimensions (mm) | Crucible Volume (L) | Power (kw) | Weight (kg) |
| 1700℃ Box-type Electric Furnace | GWDL-1700R-A-1.6L | High-purity fused silica ceramic | L=1120, W=800, H=1370 | 1.6L | 10 | 200 |
| GWDL-1700R-A-3L | High-purity fused silica ceramic | L=1120, W=800, H=1370 | 3L | 12 | 240 | |
| GWDL-1700R-A-5L | High-purity fused silica ceramic | L=1120, W=800, H=1370 | 5L | 15 | 260 | |
| GWDL-1700R2-A-10L | High-purity fused silica ceramic | L=1825, W=1825, H=2100 | 10L | 30 | 330 | |
| GWDL-1700R2-A-17L | High-purity fused silica ceramic | L=1825, W=1825, H=2100 | 17L | 45 | 470 | |
| GWDL-1700R2-A-50L | High-purity fused silica ceramic | Customized | 50L | 55 | 750 | |
| GWDL-1700R2-A-70L | High-purity fused silica ceramic | Customized | 70L | 75 | 950 |
| Name | Function Introduction | Options | Function Code |
| Temperature Controller | Standard 50-segment heating curve; imported instruments can be selected alternatively (B) | Two choices | AB |
| Touchscreen | Chinese menu, storage of multiple heating process curves, storage of historical curves and data reports (7-inch) | Four choices | C |
| IoT Interface | The RS485 communication interface of the electric furnace reads and writes real-time data such as furnace start, pause, stop, heating curve, allowable time, etc. | D | |
| Computer Control Software and Hardware | The furnace can be controlled via computer for starting, pausing, stopping, setting heating curves, reading heating curves, and parameter adjustment with high reliability and easy operation. It displays measured value, set value, output value, segment time, segment number, heating curve, and power percentage curve. Heating curves can be stored, set values and common parameters modified via computer. Historical curves and reports can be saved for a long time with selectable time intervals (1s-1h). | E | |
| PLC | Adopts Siemens PLC control (capable of reading and writing furnace start, pause, stop, heating curve, time, temperature curve, atmosphere, flow, switch quantity, power supply, power); opens ports for serial and parallel data with upstream and downstream equipment | F | |
| Air Inlet | Float flowmeter + manual valve; the number of flowmeters, maximum output, and gas medium can be selected | Two choices | K |
| Digital display mass flowmeter; the number of flowmeters, maximum output, and gas medium can be selected | M | ||
| Air Outlet | Exhaust port, manually opened; DN30 | Two choices | T |
| Electrically opened, automatically opened or closed at segment N according to the heating curve | P | ||
| Fully Automatic Air Inlet and Outlet | Electric exhaust port and electric air inlet can be associated with heating curve segments to be automatically opened and closed at any temperature segment; PLC is used to realize automatic opening and closing during heating (on the premise of selecting the touchscreen function) | Y | |
| Vacuum Atmosphere | The feeding chamber, high-temperature furnace chamber as a whole, and discharging chamber adopt vacuum-sealed shells to prevent oxidation, and can be used with atmosphere | R | |
| High-Temperature Stirrer | Uses frequency converter and reducer for speed regulation; the stirrer rod is made of high-temperature ceramic | Z | |
| Independent Control Cabinet | Control system is separated from the furnace body; an independent control cabinet (1600x600x400) is added, and the length of the control cable is extended (within 5 meters) | Q | |
