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.

Box furnace (muffle furnace) Precautions

Because box furnace (muffle furnace) products are high fever, so in daily use must pay attention to the safety of life and property of the State Security.
One would be automatic temperature controller flat on a smooth place'' not'' in order to avoid too close from EAF furnace heat affect electronic components'''' and then remove the short route to the furnace with the power cord into an electric furnace and then'' to the power cord connected to AC 220V'' and furnace controllers are effective electrical connection.
Two. Thermocouple with a wire connected to a temperature controller'' Note'' ± pole can not be wrong check again whether there is installed an error.
Three would be the thermostat to the desired temperature'' connected control box "type" of power'''' At this point turn the power switch into the red light green light to start work.
Four when the muffle furnace first time or long-term disabled again after use and must be oven dried.
Note:
Installation of all electrical distribution equipment and instrumentation through checks and adjustments'' and check the furnace and the voltage is normal'''' has good contact with the maximum temperature never exceeds the limit temperature series product configuration object'' to take the furnace must be cut off power to ensure safety'' furnace should be placed in a dry place to prevent moisture'' use'' leakage and cracking caused by heating refractories such as automatic temperature controller needs to swap places'' need'' to connect the console to avoid damage to the short route vibration meter.

Trolley type gas roaster

Trolley type gas roaster advantages:
Trolley type gas roaster pumping gas the hearth the trolley flame furnace, to imported industrial furnace equipment features, by our factory according to China's national conditions and usage, performance and technology to further improve the success of research and development, has now been dozens of home users successfully used for many years, the Practice has proved that this technology is very mature, according to user feedback, it shows significant power savings, temperature uniformity, environmental cleanup, easy maintenance, etc. Compared with the original conventional furnace. The car-type flame gas roaster eruption heat up down the middle of the flue rotation in the case of the top of the arc discharge design, effective control of the temperature uniformity and heat utilization. The furnace by the furnace (including lining) door, furnace vehicles, combustion systems, exhaust systems, sealed, temperature control and records and other major components.
Trolley type gas roaster structural features:
1, trolley type gas a roaster furnace body skeleton by a variety of large and medium-sized steel-site combination welded the shell closure plate color plate overall rugged beauty.
2, trolley type furnace lining the mullite refractory fiber insulation, about 60% of energy relative brick hearth.
3, trolleys skeleton by the combination of a variety of large I-beam, channel steel, angle steel and thick steel plate welded together. Trolley drive motor, worm gear reducer combination through the chain-driven front-end capstan drive. Trolley the refractory masonry the high alumina stereotypes brick structure, the furnace sealing effect, high compressive strength. Trolley and the furnace is sealed with a soft touch, and the lower part of the trolley a labyrinth sand seal groove and sand seal knife sealing device.
3, car type gas roaster oven door with side opening, simple and convenient, sealed with hand wheel clamping mechanism.
4, the combustion system: the installation on both sides of the car-type gas roaster dozens of small burner, multi-burner small heat flow in the furnace cycle back and forth to ensure temperature uniformity. Burning Tsui automatic ignition, instrument control.
, Smoke devices: upper end of the furnace exhaust device, the installation of an adjustable valve plate, the valve can adjust the pressure in the furnace.
6, the control system uses a simple and practical chain control, digital table shows the temperature and contactor control.

Industrial furnace repairs

Industrial furnace repair machinery thermal processing plants mostly in the 650 ℃ -1700 ℃ of temperature, therefore, bear masonry industrial furnaces and furnace heat ablation sudden change of temperature effect.
Of furnace gas and molten slag chemical attack and a variety of materials, high-temperature air and the molten metal impact wear, a combination of factors which accelerate the industrial furnace damage. Therefore, compared with the general cold equipment, industrial furnace technical condition prone to change, life is short, repair more times.
In general machinery plant, the number of industrial furnaces, while small, accounting for the total number of devices 5% -8%, but the annual overhaul Number of units Number of units accounted for all the equipment overhaul 16% -20%.
As we all know, cast iron with a cupola furnace will be carried out for each open one day a small repair; forging furnace, then at least once a year to overhaul.
Industrial furnace repair so many times, fast changes in working conditions at the plant in addition to the individual foundry equipment (such as molding machine, shot blasting machine, etc.), the fear in the number of all types of equipment to be "among the best."

Low-temperature box furnace

Introduction to the low-temperature box furnace
Uses: mainly used steel workpiece quenching, normalizing, annealing conventional heat treatment with special equipment.
Features:
1. Electric furnace loading capacity, high productivity, especially for small and medium-sized mechanical heat treatment heating, energy saving up to 20%, temperature uniformity, the DRO automatically furnace temperature control, high precision;
2. Electric furnace installed Imperial material, operating conditions;
3. The seal of the door and the furnace for self-sealing, without manual sealing
4. The electric furnace has interlock protection device to prevent misoperation due to failures and accidents;

Vacuum atmosphere box furnace

Vacuum atmosphere box furnace uses:
Vacuum atmosphere box furnace according to customer needs all kinds of furnaces, universities, research institutes, industrial and mining enterprises to meet the high temperature sintering, metal annealing atmosphere reduction and quality testing is widely used in materials, physics, chemistry, metallurgy, chemical industry, new energy development and other fields.Vacuum atmosphere box furnace hearth Imported insulation material - high purity polycrystalline alumina fiber, the use of B-type double platinum and rhodium thermocouple temperature and AL artificial intelligence regulator 708P temperature controller automatic temperature control, using artificial intelligence AL adjustment algorithm, no overshoot, industrial-grade single-chip microprocessor, four and a half A / D conversion and digital correction, filtering technology to ensure measurement accuracy of up to 0.2 (± 1 ° C). Furnace shell with double ventilation design, so that the furnace can be rapidly cooling the door using circulating water to ensure that the door is not deformed in the first heat quenched, thereby ensuring air tightness of the furnace, the furnace can work in a multi-atmosphere, improve its scope of use. S of the epoxy-based resin paint made from galvanized stainless steel inside and outside the box, the outer coating of high hardness, attractive appearance, practical.
Vacuum atmosphere furnace features:
1, the control precision: ± 1 ° C furnace temperature uniformity: ± 1 ° C (depending on the size of the heating chamber may be).
2, microcomputer control, easy to operate, programmable, automatic heating, automatic insulation, automatic cooling.
3, fast heating (heating rate of 20-40 ° C / min adjustable).
4, energy (furnace imported fiber made of high temperature resistance, rapid thermal quench).
Furnace fine spray corrosion-resistant acid, furnace, furnace isolation with air-cooled furnace wall temperature close to room temperature.
6, double-circuit protection (over-temperature, over-pressure, superfluidity, paragraph even, power outages, etc.).
7, furnace materials imported refractories, good insulation properties, high temperature resistance, rapid cooling and rapid heat.

Chamber furnace Products

Chamber furnace with a cube or rectangular furnace industrial furnace, also known as box-type furnace. Chamber furnace compartment flame furnace chamber furnace two categories, chamber furnace to strictly control the temperature. Chamber furnace combustion devices or electric components are mounted on the side walls or the bottom of the furnace, heat radiation, convection, and conduction heat transfer of the workpiece. The workpiece is heated to load and remove from the oven door. Furnace chamber structure is relatively simple, for heating of the workpiece in a single piece, small quantities, the workpiece by weight is generally not more than 3 tons, the the hearth area not greater than 10 square meters, the thermal efficiency is low.
Chamber furnace classified:
Chamber furnace uses can be divided into three kinds. The ① chamber furnace: for metal forging and thousands of welding heating furnace working temperature of 1000 to 1300 ° C. Gas and combustion air in the mouth after the first introduction of the burner mixing, then ejected combustion. Combustion gases in the furnace after the heating of the workpiece into the flue, and finally by the chimney into the atmosphere. Stove burner, furnace, metal hob, door, flue and adjust the flue of the furnace pressure gate. ②-chamber-type heat treatment furnace: normalizing, annealing and quenching, the furnace temperature of 800 to 1100 ° C, heating for tempering and aging, the furnace temperature 150 to 700 ° C is used to eliminate stress in the metal forging and heat treatment heating as . (3) Room type roaster: Investment Casting Shell roasting and enamel roasting furnace temperature of 850 to 1200 ° C.
Chamber furnace features:
Chamber furnace with sealed metal furnace shell, the heating element is mounted on the inner surface of the both sides of the furnace, the furnace bottom, and front and rear door. Tightness of the furnace, and more uniform heating, and the furnace temperature can be precisely controlled.

The structure introduced oven

Drying oven is divided into: general type and blast two. Blast drying oven fitted with a fan in the box to accelerate hot air convection to keep the temperature uniform . The items inside accelerated evaporation of water vapor to dissipate in the air outside the box , in order to improve the drying efficiency.Drying oven is divided into: general type and blast two. Blast oven fitted with a fan in the box to accelerate hot air convection to keep the temperature uniform . The items inside accelerated evaporation of water vapor to dissipate in the air outside the box , in order to improve the drying efficiency.Oven for drying items or dry heat sterilization . The temperature adjustment range , (50 ~ 200) ℃ ( or (50 ~ 250) ℃, (50 ~ 300) 0C).First, the structure of ovenAlso known as oven or oven drying . Mainly by the cabinet , the heater and temperature control system consists of three parts .Cabinet includes enclosure , thermostatic chamber , door , into the vent , side room .Enclosure Material: shell with a thin iron plate ( or sheet steel ) is made. Multi- tank wall is divided into three ( including housing ) , formed between the inner and outer two three- iron sandwich , sandwich filling the outer insulating material ( glass fiber or asbestos ) , as hot air convection within the mezzanine floor .Thermostatic chamber : the inner space surrounded by iron called thermostatic chamber . There are 2 to 3 layers of mesh shelves for placing items. Temperature controller temperature probe ( temperature sensing part ) , from the left wall into the heated indoor . Heating wire is installed in the bottom of the sandwich .Door : usually are double ceremony. The inner door is glass door , for reducing heat loss observed in the case of baked goods . Exterior doors for insulation .Inlet vent : has a bottom or side air intakes , dry air will enter . Tank top has a vent at its outlet with adjustable exhaust windows , whereby the steam to escape. Exhaust a thermometer inserted into the center of the window , to indicate the temperature inside .Ceshi : To control room. Generally located in the box on the left , with thermostatic chamber separated by insulation . Within which is mounted switches, lights , temperature controllers, blowers and other electrical components. Side chamber door opened , can easily access the circuit outside the electric wire .And some electric box will control room set up in the box at the bottom.Second, the electric heaterOven electric heater usually consists of four electric wire parallel. Heating wire coiled evenly fired by refractory insulation board. Generally divided into two groups , controlled by the switch . Total power (2 ~ 4) kW, up to large power 8 kW. Larger power , the cabinet are greater.Third, the temperature control system
 Used on the previous oven temperature control system, usually have differential rod and mercury thermometers two. The use of modern production oven temperature control system mainly by the temperature sensor , the temperature control circuit , the relay , the temperature setting and the temperature display part .

The structure of industrial furnaces

Industrial furnace heating the material to physical and chemical changes in industrial heating equipment. Furnace and kiln and distinguishable, but a slightly different meaning. In the machinery industry, generally used to complete workpiece or material thermal heating, melting and heat treatment process used thermal equipment called a furnace, and for silicate industrial heating equipment called a kiln. The industrial furnaces often referred to as industrial furnaces.
With the needs of the different production processes, the structure of industrial furnaces in many forms, but in general, shall meet the following requirements:
1) heating speed, high yield per unit area.
2) furnace temperature, the atmosphere is easy to control the product quality is good.
3) in the low energy consumption, high thermal efficiency.
4) The structure is simple, low cost, long life, easy maintenance.
5) operation is simple, a higher degree of mechanization and automation, less environmental pollution, good working conditions.

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.

High-temperature vacuum furnace atmosphere Precautions

1, except for people who do experiments, other people do not stay in the high-temperature furnace area.
2, the experimental work is completed, if no one to 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.
3, treatment of HF, wear gloves, if not accidentally hit HF, immediately flush with calcium gluconate plus 2% of the water, rub the wound 15 '.
4, quartz glass Use with caution, so as not to rupture, causing severe cuts.
5, avoid inhalation treatment tank from the stove or the smoke of various gases.
6, potassium cyanide (KCN) can not be mixed with acids set, because the two of KCN can produce toxic gases.
7, if found to have the things that interfere with the safe, please immediately notify the relevant personnel (technicians, etc.).
8, please conserve water muffle furnace usage.
9, 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.
10, the length of the rod tip, when in use yet, please upward to avoid contamination.
11, the wafer into the baked mouth, to undertake boat's holder, please 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 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.

Bell bright annealing furnace works

The bell-type bright annealing furnace by the heating hood cover, cooling cover, inside cover, stove, vacuum system and electrical control system. The furnace is mainly for strip and wire coiled bright annealing and tempering high production efficiency, less pollution, easy operation and maintenance and so on.
Work piece placed in a protective atmosphere filled with the protective hood uniform heating and cooling. Strong and protective atmosphere circulating fan can work after annealing to obtain a uniform surface hardness and luster, the vacuum system for protective gas and air replacement, the safe and reliable operation. Hood can be equipped with multiple hearth furnace, continuous operation, and its work processes generally: furnace installed - I vacuum - through protective gas - heating - heat - gas, water combined cooling - vacuum cleaners - deflated - baked - next workflow.
1. Vacuum cleaning system can be completely avoided mixing with air, hydrogen, hydrogen atmosphere for high fully applicable, and with plenty of protective gas than simply reduce the cost of cleaning the muffle furnace, the furnace atmosphere to accelerate the transition time. 2. Temperature uniformity is good, the furnace temperature can be controlled within the workpiece within ± 5 ℃, each part to be treated consistent with good mechanical properties.
3. Fan and stove, stove connection with the inner cover parts used PPM level airtight sealed structure for the safe use of the atmosphere to create the conditions to be treated without removal, adhesion phenomena, and to meet carbon steel, alloy steel, etc. bright annealed material.
4. Use of strong convection blower, vacuum cleaning, gas, water and other new technologies combined cooling, can speed up the process cycle, increase productivity, the main performance indicators have reached the level of similar foreign products.
5. Cooling system with a shunt (axis wind turbine structure) as compared to gas, water cooling can accelerate the combination of cooling the workpiece, to simplify the device structure, reducing construction costs and ease of maintenance.
6. Can automatically complete heating, insulation and other processes, temperature SCR power microcomputer intelligent control, programmable logic controller can be used to achieve full operation of automatic process control and automatic recording.
7. With over-temperature alarm, explosion relief, cooling water pressure loss alarm, emergency gas supply and other safety devices, safety and reliability.

High-temperature box resistance furnace advantages

High-temperature box resistance furnace, crucible resistance furnace used in various industrial and mining enterprises, universities, research units, small pieces of steel hardening, annealing, tempering heating. Carbon heater male used in steel mills, iron foundries, laboratories for carbon and sulfur exposition purposes. Therefore, high-temperature furnace with a temperature control device, control thermocouple temperature measurement instructions conditioning, active saving temperature in the furnace. Analog and digital temperature controller is divided into two kinds. Today's sx series resistance furnace is the product of the old reform and upgrade replacement product, with the first registered domestic chic produced initiative of the instrument response xmt series temperature controller and thermocouple, the temperature of the furnace control cutting accuracy higher and more automation. Another variety of special specifications can be customized large box-type furnace, tube furnace, tempering furnace pit. With programmable computer temperature controller can control the speed, temperature band.
When using high-temperature box resistance furnace, heat treatment equipment to work, we still have to pay attention to the following points:
1 Do not use over the course of the maximum temperature of the resistance furnace.
(2) when the sample taken must be installed to intercept the power to prevent electric shock.
3 loading door closed when the sample taken time should be as short as possible to reduce the furnace life.
4 Suppression of the furnace absorbed any liquid.
5 shall not be stained with water and oil sample into the furnace; shall not be moistened with water and oil clip loaded sample taken to avoid accidentally touching the fire;
6 sample taken when mounted to wear gloves to prevent burns.
7 The specimen should be placed on the furnace center, not misplacing.
8 furnaces and not just touch around the sample.
9 should be completed after intercepting power and water supply.
10 management staff are not allowed to manage, may manipulate the high temperature resistance furnace, should be strictly in accordance with the procedures for execution control equipment.

Sealed box furnace into the furnace technology

1. When everything is ready to pass the inspection before working furnace heating, when the the muffle furnace temperature greater than 750oC, only through endothermic atmosphere, the furnace gas positive pressure, and then lit the fire curtain and front room row of net operating.
2. Until the furnace heated to 930oC, the curtain of fire lit, the part is available into the furnace.
3. Quenching lifting mechanism, is expected out baskets channel, is also quenched, pre-cooling, and drain fixture position of the lifting mechanism and process requirements, generally on the platform below the first material basket quenching oil cooling, the material on the above platforms baskets workpiece pushed into the carburizing furnace heating, close the inner door, the third basket pushed the above platform into the front room, along with the net emission of decontamination preheating, under the platform material basket oil the Lek best baked, the inner door is opened first two baskets, baked quenching, and three baskets into the box furnace carburizing, and so on ad infinitum.
4. If the workpiece quenching, the baked air cooling, the material basket should be placed on the platform, pre-cooling, until the next platform material basket furnace installed, let the platform material basket fell baked.
5. Fire curtain door must seal the inner door seal fire curtain shall ensure that the furnace positive pressure, oil and gas will not be admitted.

Refractory ceramic fiber performance and development prospects

In recent years, high-temperature ceramic fiber kiln firing the application prospect of expanding to all kinds of ceramic fiber insulation products to good effect, easy to use, especially in small storage and other features, widely used in all kinds of kilns , which greatly shows high energy efficiency.
(A) variety and performance: ceramic refractory fibers most important indicator is the fiber diameter and thermal stability. Commonly used in ceramic industry is Al2O3SiO2 fiber, according to the level of Al2O3 content into different scope of use, but also to introduce them to improve their Cr2O3 refractory material with antioxidant properties. Generally high alumina content, low content of iron and other impurities fiber product was pure white, chromium oxide fibers were introduced Pins milk yellow color tone. The average diameter of the ceramic fibers of 2-4 microns. Fiber fineness, low density, low thermal conductivity by use of high temperature. If crude fiber, high density use is not ideal. The thermal stability index fiber is more important. Al2O3-SiO2 fiber variety of products at 1260 ℃ linear shrinkage between the range of 35-88%. Also directly affects the amount of shrinkage thermal stability.
Low thermal conductivity of the fiber density, light weight, the design and construction of the furnace are used when lighter steel support structure, so that the development of ceramic kiln into the "kiln lightweight" era. Fiber regenerative small, adapt to rapid heating and cooling firing mode. Flexible fibers can be processed into products with recesses or openings, and has good resistance to mechanical vibration and shocks, good chemical stability, these advantages is the development of a new furnace, and spread to ceramic technology, industry have an important role in promoting development.
Currently ceramic fiber products are: carpets, blankets, blocks, bulk fiber, fiber paper and vacuum forming of various products, the working range is generally 871-1427 ℃, special circumstances may be short-term temperatures above the temperature limit is used.
(2) masonry methods and precautions: refractory fiber felt for furnace lining can greatly improve energy efficiency. General use of synthetic organic binder so that the fiber volume tubular or sheet-shaped fabric. Lightweight high temperature furnace brick masonry wall, the available refractory ceramic fiber blanket paste into the lining, after firing, the fiber mat or plate form a certain rigidity and ability to have satisfactory reply, the cooling time can play back so that the seam taut.
Masonry fibers are usually two ways: First, the rugs applicator layer by layer, and then the bolt lever riveted together, usually in the 1222 ℃ temperature below with metal bolt rod, 1223 ℃ above using ceramic quality rivet. Side by side with the bulk heat resistant fiber and cement filling. Riveting quality ceramic pieces can prevent deposition of carbon fiber deterioration. The second method is the use of prefabricated assembly, which uses rugs stacked preform or the rugs with a wide 305mm folded accordion style preform. In comparison, the latter due to the hot surface next to the furnace shell are the same materials, energy efficient, but the cost is higher.
Temperature, the fiber preform required masonry seam formed elastic fiber inlay. Prefabricated assembly, easy installation, quick and easy maintenance, simply replace the damaged part down.
On the thermal efficiency, the layers of the applicator way better than prefabricated assembly. Because the former fiber direction perpendicular to the heat, the stack assembly of prefabricated shaped fiber direction parallel to the heat flow difference between the two is about 20-40% of the heat conductivity, such as accordion-like assembly of the preform folded in between its fiber direction parallel and perpendicular to the heat flow.
(3) Prospect: Due to rising energy prices, fuel costs will become a bottleneck in the development of ceramics curb, saving even more important. People are increasingly concerned about the heat loss of the furnace, some directly affixed to the original surface layer of refractory lining refractory ceramic fibers in order to improve thermal efficiency. In the kiln must be affixed to the wall before the apparent cracks or spalling parts repaired. But insulating firebrick and refractory fiber can not be indiscriminate. So far, such as basic oxygen steelmaking furnaces, cement rotary kiln lining, serious erosion due to high temperature chemistry are temporarily unavailable fiber as lining.
For continuous heating equipment, such as ceramic tunnel kiln, have long been used as a refractory ceramic fiber lining continuous heating equipment, according to the information reported, quickly push board kiln and tunnel kiln refractory ceramic fibers used in energy-saving effect is very significant. In particular, ultra high temperature heating, such as firing temperature 1538 ℃ -1649 ℃ kiln, the use of the best energy-resistant fiber.
At present, Europe and Japan ceramic kiln equipment used ceramic fiber lining. Gas-fired tunnel kiln recently Japan will be decomposed into sub-sections such as car manufacturing structure, and then delivered to the construction site porcelain factory assembled, all this is due to the use of ceramic fiber material, saving furnace costs, easier sake. Modified from the material aspects of ceramic fiber products to promote energy efficiency study is also underway.

High-pressure atmosphere sintering furnace

A high-pressure atmosphere sintering furnace structure
A high-pressure atmosphere sintering furnace designs and manufactures three types of pressure vessel standards, 16MnR or 304 of the furnace shell.
2 door locking bolts or teeth gnawing quick release flange, easy to operate safe and reliable.
Lid lifting electro-hydraulic operating light to reduce labor intensity.
Furnace insulation materials for carbon deposition the composite hard felt, heating elements for German imports of graphite.
5 temperature measurement devices using the company's own development of ultra-high temperature protective tube with tungsten-rhenium thermocouple, thermocouple wire service life of up to six months.
Control system for PLC + touch screen, complete safety interlock protection and alarm functions.
7 high-pressure valves and piping, etc. selection the "Shiwei Locke brands imported products, safe and reliable.
High-pressure sintering furnace features
1, the pressure is easy security qualified, safe and secure
2, dual high-temperature protection device
3, electric heaters burning air defense protection device
4, the double pressure protection switch
5, mechanical overpressure protection relief switch
6, automatic pressure relief safety shutdown protection switch
7, dual low-voltage door limit protection switch
High-pressure atmosphere sintering furnace electrical control
1, LCD liquid crystal display the HMI controller + PLC program controller
2,40 segment thermostat range memory storage function
3, the program automatically monitor and abnormal exclusion
4, PID + SCR the automatic calculation temperature control interface
5, the temperature and pressure data sampling recorder.

Vacuum heat treatment furnace experiment points to note

1. Vacuum furnace should have a fast-cooling devices. Cooling water pressure should be greater than 0.2Mpa, flow should be adjustable.
2. Heating: Put the workpiece, usually the first pre-heated before pumping to 6.67Pa when heated.
3. Heating process, the workpiece will be deflated and the furnace materials, the vacuum decreased.
4. Cooling gas: steel is generally used 99.995% purity nitrogen, high temperature alloys used 99.999 percent nitrogen or argon, titanium using 99.995% argon.
5. Vacuum furnace part of all active connections rubber O-ring sealed connections, the parts are cooled by water.
6. Vacuum tempering, annealing, solution treatment and vacuum vacuum aging process with conventional heating temperature is generally the same as the heating temperature.
7. Quenching the workpiece under vacuum, vacuum quenching oil should be used, this oil has a low saturated vapor pressure.
8. Vacuum furnace maintenance should state in a vacuum or under nitrogen charge to avoid the usually do not inhale, absorb moisture.
9. Domestic vacuum furnace pressure rise rate should not exceed 1.33Pa / h, some foreign enterprises standard 0.67Pa / h.
10. Titanium alloy vacuum furnace process, not with nitrogen as the cooling gas, because of titanium and nitrogen at high temperatures, to form titanium nitride golden yellow.
11. Vacuum heating mainly by radiation, the workpiece should be maintained in the furnace space.

Advantages of vacuum heat treatment furnace

The vacuum treatment furnace is a device of the workpiece to a heat treatment under vacuum conditions, the vacuum processing and compared to other heat treatment method having the following unique advantages:
Purification action: make a metal surface oxide decomposition, thereby obtaining a bright, clean surface.
2, vacuum protective effect: metal can avoid the adverse effects of oxidation, decarburization, carbon keep the chemical composition and brightness of the original workpiece surface.
Outgassing: original dissolution of the workpiece may be removed in vacuo, the absorption of gas, so that the metal product performance has improved significantly.
4, the degreasing effect: heating in a vacuum, self-volatile cooling agent, a lubricant, such as grease to the metal parts used in the machining and stamping molding process, and is pumped in vacuo, and will not react with the surface of the part at a high temperature. It can be obtained no oxidation, no corrosion very smooth surface.
5, save energy: vacuum heat treatment furnace heat storage and heat loss, high thermal efficiency.
6, the heat treatment of the workpiece deformation is small, easy to crack, product qualification rate, long life; vacuum heat treatment can easily be in strict accordance with technical requirements to control the temperature change, so as to obtain the desired microstructure, reducing the deformation.
7, after the vacuum heat treatment product can be directly used for plating or as a final product, eliminating the step of cleaning, surface machining and other auxiliary greatly reduce production costs.
8, environmental pollution, high degree of automation, simple operation.
Vacuum heat treatment furnace features:
Quenching, tempering, annealing, brazing, sintering, etc. a variety of purposes;
2 fully automated process control, stable operation, human-machine interface (optional);
3 powerful cooling capacity the quench a wider range of applications;
Uniform heating, cooling uniformity, small deformation of the workpiece;
Energy conservation, and pollution;
6 kinds of protection function, make the operation safer;
Cooling Fan Frequency (optional), the cooling method is more flexible.
Vacuum heat treatment furnace uses:
Vacuum heat treatment furnace is widely used in alloy steel, tool steel, high speed steel, tool steel, bearing steel, spring steel, stainless steel, heat-resistant alloys, a variety of magnetic materials, non-ferrous metals heat treatment.

Furnace charging methods and requirements

First, the loading method
EAF is the most common cold loading, their way into the furnace is divided into different manual loading and mechanical loading.
Manual loading and more for a nominal capacity of less than 3t electric furnace, the disadvantage is the loading time is long, low productivity, labor-intensive.
Baskets top loading is the best method of loading speed, heat loss, and the charge can be installed in advance in advance, fabrics and reasonable.
Second, the requirements for loading
To shorten the time to ensure that the recovery rate of alloying elements, reducing power consumption and improving lining life, charging time required: accurate, pretend to be dense fabric reasonable and fast into the furnace.
Before loading, ingredients workers to conscientiously planned furnace, with the requirements of steel ingredients, according to the requirements of different kinds of steel craft, careful analysis and calculation, accurate ingredients. Therefore, the necessary approval required before loading into the steel material with the composition of the alloy composition, but also to check metering equipment to ensure full penetration after suitable chemical composition, weight accurately, in order to facilitate the smooth progress of smelting.
Dense packed charge, can be obtained once entirety, and can improve the conductivity of the charge transfer performance, the electrode wear well, the muffle furnaces arc stability, and is conducive to melt. To achieve a dense, smooth loading time will depend on large, medium and small charge a reasonable match. Typically, the charge is less than 10kg of petit material, 10 ~ 25kg called the material, more than 50kg called aniseed. When charging, the charge capacity of different furnaces have different size requirements, but the charge may not exceed the maximum total weight of the charge 1/50.
Reasonable fabric is more important, generally is part of the small material miscellaneous iron baskets mounted on the bottom, in a small material above the center of the baskets loaded aniseed or refractory material, intermediate fill small material, so smooth, dense, large gaps, making it conducive to conducting, but also to eliminate and prevent the collapse of the bridge material is broken electrode material. The remaining material packed in small aniseed or refractory material on top and around. Finally, in the upper part of baskets loaded material weight 0.02% to 0.03% of the miscellaneous iron, in order to facilitate arc, stable arc current and reduce radiation damage on the lid.
Steel slag, Tang Tao steel and other difficult-conductive charge should be installed in a place away from the electrodes, so as not to affect the conductivity. Do not install in the vicinity of pig iron door, but to be installed in aniseed or refractory material around facilitate its carburizing effect, reducing aniseed or refractory material melting, thus speeding up the melting. Where the alloy into the furnace, in order to ensure the recovery rate of the elements should be based on their different physical and chemical properties installed in different locations, such as tungsten, molybdenum, iron high melting point, easily oxidized, can be installed in the high temperature zone, but do not install in the arc below; ferrochrome, nickel plate, ferromanganese, etc. should be installed in a position away from the high temperature zone, to reduce their volatilization losses.
The furnace temperature is high in the middle, surrounded by low, so the cloth should be done high in the middle, surrounded by low. In addition, you should also ensure Chuanjing fast, do not bypass, after the furnace door and slope without aniseed, no refractory material.