Laboratory furnace

Introduction to laboratory furnace
The quality aluminum silicate fiber, state-of-the-art vacuum molding process and automatic control technology to develop a set of energy-saving, efficient, beautiful and one of the new laboratory furnace. Department of laboratory furnace cycle mode of operation energy-efficient furnace, heating up fast, make no use of small, good temperature uniformity, for laboratory, industrial and mining enterprises for the metallic elemental analysis and general metal heat treatment.
Laboratory vacuum features
1, silicon carbide lining, all-fiber insulation.
 2, laboratory furnace hearth material made of ceramic fiber, thermal capacity is small, fast heating (30 minutes to reach the set temperature), short cycle, saving energy (energy-saving effect is plain old furnace 80? Above).
 3, the use of intelligent digital programmable temperature controller, the preparation of multi-liter, security, cooling curve, automatic heating, insulation, cooling and over-temperature protection, the end of the program to run automatically stop without duty.
 4, high temperature resistance wire heating element placed in the furnace wall heating plate, easy to use, safe Shallow.
 5, can be configured programmable temperature control and other RS485 interface can be configured, remote control and data acquisition laboratory electric furnace. Or configuration circle diagram to adjust the recorder track record of the heat treatment process.

High temperature laboratory furnace annealing furnace refractory castable inspection

Furnaces, laboratory furnace, annealing furnace refractory castable must be required to conduct on-site measurements and the slump test block sample. Test and sampling devices used must meet the requirements and after checking.
1 reference block with pre-construction inspection. Furnace refractory castable before construction, mix design requirements should be made of the test block. Upon examination meet the requirements.
2 test block lien. Furnaces, laboratory furnace, annealing furnace refractory castable should be for each single project or mix brands, each 20m3 batch. Indwelling test block can be tested, also made a number less than this number of tests; every single project using the same grade or mix multiple construction, the construction of each test specimen shall be retained.
3 TESTING. Furnaces, laboratory furnace, annealing furnace unshaped refractory castable, etc. should be done TESTING project and the number of samples in accordance with regulations.
4 specimens conservation should be specified.

Precautions furnace

First, in addition to doing experiments, but do not stay at a high temperature furnace area.
Second, the experimental work is completed, in the absence of people continue to use, please close specialty gases, retention N2 flow tube maintained at standby temperature and see if there are other power related and not related to this, such as: cleanhood lighting, cooking acid used Small electric or other, please turn off.
Third, the treatment of HF, wear gloves, if not accidentally hit HF, immediately flush with calcium gluconate plus 2% of the water, rub the wound 15 '.
Four, quartz glass Use with caution so as not to rupture, causing severe cuts.
Fifth, avoid inhalation treatment tank from the furnace or the various gases are emitted.
Six, potassium cyanide (KCN) can not be mixed with acids set, because the two of KCN can produce toxic gases.
Seven, if found to have the things that interfere with the safe, please immediately notify the relevant personnel (technicians, etc.).
Eight, please conserve water usage.
Nine, broken chips, paper, cotton swabs ....... etc., do not fall into the cleaning tank bottom drainage holes to prevent waterlogging due to poor drainage caused by the floor.
Ten, the front-end length putter, when used in yet, please upward to avoid contamination.
Eleven, baked chips into the mouth, to undertake the boat's holder, do not touch the tube opening to avoid contamination of the furnace tube.

Laboratory furnace installation and maintenance

Laboratory furnace is a relatively complex mechanical equipment, when installed after going to follow the instructions on the details, and if not installed in place can cause devastating damage to laboratory furnace, and even greater harm.
Laboratory furnace installation played five steps:
1 First, check the drawing accessories: Before installation check first by basic design to meet the requirements. Check the stove accessories are complete. Whether there is damage during transport, lining without cracking and collapse, and the heating element has shorted out put bricks phenomenon.
(2) whether the short circuit resistance: laboratory furnace before drying, apply a multimeter to measure the heating element and the furnace shell resistance, does not allow short circuit. After drying, apply 500V megger cold insulation resistance value is not less than 0.5MΩ. Resistance furnace operating voltage exceeds 36V, there should be a good grounding devices.
3. Electronic control, temperature control should be arranged in the furnace side refused, not too far away from the stove, the control cabinet door is greater than 600mm from the wall bracket is anchored component. Various gas waterway according to the provisions painted different colors to show the difference. Flammable or explosive gas source should be placed in a dedicated secure isolation room.
4 outer furnace shell exposed live parts and transmissions should be added to protect the casing, in order to ensure safe and reliable operation, to set the necessary protective measures, such as overcurrent relay, pressure switch and automatic circuit breaker and so on.
5 Pit laboratory furnace is usually installed in the ground pit lid elevation on the ground about 500mm. Stove main circuit cable and thermocouple wire should be laid in the trench, on top cover plate.
Laboratory furnace repair and maintenance
Type silicon carbide furnace, silicon carbide found damaged, should be replaced by standard resistance values ??similar contrast and a new silicon carbide. Change ends when the first maintenance cover and remove the silicon carbide chuck, then remove the damaged silicon carbide, silicon carbide as easily broken, the device should be careful when both ends of the furnace shell exposed parts should be equal, Chuck must fastening, making good contact with the silicon carbide.
If there is severe oxidation chuck should get a new one. Silicon carbide devices at both ends of the slit holes using asbestos rope infarction. Not exceed the maximum temperature of the furnace temperature mission 1350 ℃. Silicon carbide rod V-type mixer at the lowest temperatures allow another task four hours. Very long time in the furnace after use, such as hair conditioning clockwise to the maximum heating power conditioning knob position, the heating current is still stagnant. Small additional value interval labeling machine farther reach the required heating power, explaining silicon carbide has aging.
Box muffle furnace in time do not change connection assembly of silicon carbide, just change connection, and then changes to laws, to pay attention to when using a muffle furnace heating power conditioning knob slowly conditioning, heating current value must not exceed the additional values.

Tube furnace atmosphere to use

Note that a
Furnace operator should have the corresponding national electrical equipment operation qualifications, and familiar with the electric kiln random instructions and other technical documents!
A temperature system operation:
Users switch plate to furnace power transmission, this time schedule was electric, according to the temperature instructions set the instrument (such as P, I, D parameters), according to the technical requirements of the heating process, open the heating knob, the heating power to reach 6KW. Heating power can be calculated as follows:
Heating power = voltage × Meter Current Meter
Normal heating current is approximately: 22A, heating voltage is approximately: 220V.
Stop heating: temperature program after program execution time = 0 segment, heating ends. The stop button is turned to the closed position. Breaking user switches.
Note that two
a. programmed temperature not higher than the temperature furnace parameters.
b. furnace work, do not open the door. Take the product, should wait until the furnace temperature below 100 ℃.
c. temperature heating, the heating power shall not exceed 6KW, otherwise it will damage the heating element.
Operation
Requirements for laboratory furnace use, loading and unloading using intermittent manual loading, unloading. When loading a cartridge placed in the spout bracket, one end open and take the baked pipe sealing cap, strip cartridge into the cartridge holder, and then sealing cap installed on the furnace tube flange and tighten the clamp bolts. Then Walter craft atmosphere until the oxygen content of the furnace tube when heated sintering process requirements. Product sintering process is completed, the process should continue to Walter atmosphere and make some cool until the temperature is below the furnace process requirements, the only open tube sealing cap remove the product.

 

The basic requirements of laboratory furnace installation instructions and performance purposes1 is connected to the controller and the experimental furnace power cord, switch and fuse the load capacity of the furnace should be slightly larger than the rated power.Two experimental furnace without special installation, just flat on the interior floor or stand. Controller should be on the table, the work surface should not exceed 5 degrees tilt the controller from the experimental furnace minimum distance of not less than 0.5 m. Controllers should not be placed above the experimental furnace, so as not to affect the controller is working properly.3 wiring, first loosen the screws on both sides around the controller enclosure, and then turn on the cover. Controllers and electric furnace and thermocouple cable connection (best to use compensation wire) would thermocouple from thermocouple hole in the insert holder furnace, the gap between the hole and the thermoelectric clogged with asbestos rope, and then fixed.4 In order to check the burnout protection device is working properly, the method is: Loosen the thermocouple end, when temperature rose rapidly to the highest point instructions also automatically cut off the heating power, the burnout means good, good reconnected thermocouple , it can work properly.5 Check the wiring is correct can be energized, the first on the power switch, and then the experimental furnace controller toggle switch on the front panel to pull the open position, adjust the Settings button, set the temperature to the degree you need , if the set switch to pull the measuring position, the red light is off (NO), the contactor also pull sound, laboratory furnace is energized, the heating current ammeter indicates the temperature slowly rises with increase in temperature in the furnace, indicating that working properly.Laboratory furnace performance summary and use instructionsShell surface made of high quality cold rolled steel, high temperature materials coated, clean, anti-corrosion, anti-smoke, easy to clean, clean, non-toxic breath while hob surface non-stick coating, may also be baked. It has a fast heating, easy to use, high thermal efficiency, particularly safe, durable and so on. Laboratory furnace basic performance, more accurately speaking, the number of laboratory furnace is a closed furnace, however, has its own according to the actual needs of its unique properties, the use of laboratory furnace is converted to heat energy with the principles, the tube furnace heating body is fully enclosed in high temperature insulation material.The main purpose laboratory furnace is based on a closed laboratory furnace above analysis of the advantages, but also through the practice of verification, which is widely used in major schools, industrial and mining enterprises, environmental protection, hospitals, laboratories and scientific research laboratories and other units , one of the necessary equipment is commonly used, but also the ideal home heating appliances.

 

Laboratory furnace steelmaking common sense

There are many examples of steel, mainly induction furnace steel making, open-hearth steelmaking, experimental electric furnace steelmaking, electric arc furnace steelmaking. Its raw materials as iron, stainless steel scrap purchased out more, interbedded with silt and other dirt, steel parathion content is higher, say in detail to experiment with electric steelmaking foundation tasks are:
(1) condensation of solid charge (pig iron, scrap, etc.);
(2) the molten steel in the silicon, manganese, carbon, and other elements to reach Specification Composition;
(3) removal of harmful elemental sulfur and phosphorus content of them down the following limits delineated;
(4) to quit the gas in the molten steel and non-metallic alienation, the molten pure;
(5) interfere alloy elements (melting steel), making it suitable for the request;
Production aspects of laboratory furnace heating more than 20 years of history. Now has more than 20 kinds of standardized furnace, temperature from 400oC to 1800 ℃ applications include: pottery, ceramics, chemicals, laboratory and dental, metal and plastic heat treatment and surface treatment technology, foundry, glass, etc. Product series box-type furnace, muffle furnace, laboratory furnace, high temperature furnace, pit furnace, bell furnace, car electric stove, heat and melting crucible furnace, pit furnace and so on.