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 double furnace chamber fuel tank roaster

Double oven chamber fuel tank roaster uses:
Double oven chamber fuel tank roaster suitable for precision forging, high consumption of resources is one of the difficulties plagued precision forging industry, fuel roaster roasting touch shell pouring step is the forging of gas guzzlers, especially fuel unit price and raw materials The unit price spiraling resulting in the high casting cost, straightforward affect the precision forging the efficiency of enterprises.
The double furnace chamber fuel tank roaster structure:
Double oven chamber fuel tank roaster, user resistance produced on-site test fuel economy achieved remarkable results, functional winning the user what to order three. For the phase-out of the fuel tank have been used roaster. Facilities construction and the work theorem new fuel tank roaster by two furnace chamber. A furnace chamber when the cannon refining touch another furnace chamber housing using waste heat to preheat the guns furnace chamber, in order to fully take advantage of the thermal energy of the fuel occurs, to achieve the goal of parsimony fuel.
The two furnace chamber alternately be used as a gun refining, preheating, using the same fashion oven baked with single furnace chamber roaster, easy to operate. The double furnace chamber fuel tank roaster reference energy efficient burners, compressed oxygen fuel atomization, fuel atomization full fuel completely, gun refining performance. The double furnace chamber fuel tank roaster reference high-quality lightweight refractory bricks, and the wall of the furnace oil furnace casing during complement the high-quality refractory fiber insulation, furnace furnace insulation function.

Furnace safe operating procedures

The use of high-temperature furnace heating current to the furnace heating elements or heating medium, and thus the workpiece or industrial furnace for heating materials. Industry resistance furnace divided into two categories, periodic furnace operation and continuous operation furnace, tube furnace is a high-temperature furnace, a unique feature has a simple structure, temperature uniformity, easy to control, heating quality is good, no smoke, no noise, etc., but with higher fees. Use high-temperature tube furnace furnace should strictly follow safe operating procedures to do, to ensure the safety of personnel and to avoid the furnace, the workpiece damage.
First, before work processes
1, check the furnace is clean, clean up debris to ensure the furnace clean.
2, check the furnace wall, floor furnace for cracks and other damage.
3, the resistance wire and thermocouple leads to the installation of fastening rods, check the meter is normal.
4, check the resistance furnace door switch is flexible.
5, to ensure that the normal, they began to put the workpiece.
Second, the work flow
1, put the workpiece to ensure that power is off.
2, gently so as not smashed heating elements, furnace floor, etc.;
3, put a wet piece is strictly prohibited, furnace heating of the workpiece and the heating element should be kept 50-70mm distance; workpiece should be placed neatly, not stacked too high in order to avoid damage the thermowell
4, the work examine the various instrumentation and, if abnormal, timely maintenance.
5, high-temperature furnace at 700 ℃ or more, are not allowed to open the door to cool down or baked, so as to avoid quench furnace shortened lifespan.
Third, the work process.
1, cut off the power supply
2, gently work, make sure not to damage the furnace and the workpiece.
3, replace furnace, according to the above procedure is repeated.
4, clear theory within the debris to ensure clean.
5, pay attention to routine maintenance work.

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.

 

Tube resistance furnace installation considerations

A laboratory tube resistance furnace without special installation, indoor and uneven ground or table can be placed. But supporting the controller should avoid vibration, placement and should not be too close to the furnace to prevent overheating and affect the normal operation of the control section.
2 Insert the thermocouple from the even holes, even the gap between the hole and the thermocouple with asbestos rope packing to prevent heat loss.
3 reveal temperature controller enclosure, connect the power cable as standard, electric wire, thermocouple and safety switch wire, because the controller is shared with the Department of furnace line, so the phase and neutral is not reversed, pay attention to the thermocouple connections. "+ "" - "pole can not be reversed, otherwise the instrument will not indicate.
4 would XCT-101 rear connection panel temperature indicator "short" and "short" the connection between the mechanical zero adjustment, if the compensation wire and cold junction compensator, should the mechanical zero adjustment to the baseline temperature point, do not use compensating wires, put the mechanical zero adjustment to the scale zero. However, the indicated temperature is measured points and thermocouple cold junction temperature difference.
5 Check the wiring is correct, cover controller case, the temperature indicator pointer to the required temperature (ie rotating indicator panel lower corner screws) then connect the power, open the control power switch, then the green light is lit. Relays begin work, laboratory tube resistance furnace powered ammeter reading that is produced, the temperature indicator pointer is gradually rising, which means that the laboratory tube resistance furnace with temperature controller are working properly.
6. Laboratory tube resistance furnace heating with constant temperature respectively red, green represents warming, red light indicates thermostat.

 

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.

 

Box-type furnaces in the course of operating personnel should be increased to prevent

In recent years, the adoption of electronic thermostat assembly box furnace, box-type furnaces and other products together for industry, agriculture, the implementation of room heating. Surface electrostatic spray adoption process, the surface chic, perseverance has become more durable reminding known.
On the control box in the industrial furnace when we should pay attention to several aspects:
1 at the beginning of use, manipulate staff must first check whether what box type high-temperature furnace iron and other residual items, if you find any, we should clean to avoid falling when the iron made ​​into a short time signs;
2 box-type furnaces at work, pay attention to the workpiece into the furnace can not exceed the carrying amount of the oven floor;
3 inserted into the muffle furnace of the workpiece and the furnace thermocouple should not collide;
4 changes should follow the requirements of the workpiece, timed heating and cooling;
5 In order to ensure that the workpiece can be useful in the furnace burning in the manipulation of the process we can not open the door;
6 it will have to work out fine, the temperature is too high in order to avoid burns others;
7 To schedule of a box-type furnace inspection.

Tube furnace compared with the high temperature muffle furnace

A high temperature muffle furnace specific characteristics:
1, according to box-type furnace furnace size, you can use three or five-sided heating surface to ensure uniform temperature within the furnace.
2, box-type furnace use of lightweight ceramic fiber molding, high temperature muffle furnace with weight reduction compared to 2/3 of the heating rate has doubled, saving energy, the life expectancy has increased four-fold;
3, compared with the traditional vertical furnace, using 30 segments programmable temperature controller temperature control, a high level of intelligence, easy to operate.
4, ceramic fiber muffle furnace, beautiful shape, using internal and external double air cooling structure, high temperature furnace, the furnace shell exterior adhere low temperature, so as not to damage the operator.
Second, the box-type furnace line with national norms energy furnace, acting on the various pieces of stainless steel, alloy steel parts and other parts in the air or less oxidizing atmosphere for normalizing, annealing, quenching and other heat treatment equipment used. Furnace shell is made of high quality steel and welded steel. Compared with the high temperature muffle furnace, box furnace has the following characteristics:
1, box furnace with fast heating, good insulation effect, temperature uniformity, precise temperature control, energy saving and other advantages.
2, the processing of homogeneous product parts, heat treatment quality is stable and reliable.