1800 degree heat heaters

1800 degree heat heaters, the maximum temperature of 1800 degrees, silicon molybdenum rod heating elements of Kanthal, Sweden, the United Kingdom continental control system, work fine, mature technology. Suitable for sintering and other high-temperature reaction. German hot concept industrial furnace industrial furnace company has more than 20 years of design and manufacturing experience, the annual production furnace 400, the product coverage of the heat treatment, casting, ceramics, glass, solar, powder metallurgy and other fields. Temperature range from 50-2200 degrees.
High temperature of 1800 degrees trolley furnace advantages:
High temperature car furnace maximum temperature of 1600 ° C, 1750 ° C and 1800 ° C, respectively.
The standard furnace hot zone 2000 liters.
(3) may be set according to customer needs to configure the components of the furnace, to meet the requirements of precise control of the process.
4 trolleys can be completely removed from the furnace to facilitate the loading and unloading of workpieces.
The sturdy trolley design, high-quality refractory fiber material insulation.
Reinforcement design and manufacture of trolley with good load-bearing capacity.
7 Duplex furnace shell, the cooling system, the low temperature of the furnace shell.
8 high-quality alumina fiber insulation, the heat loss is low, the speed of heating and cooling, the exhaust port is located at the top of the furnace.
High quality molybdenum silicide heating element.
10 side heating, heating demand can also choose to rear and sides on three sides.
11 advanced conversion and control system, thyristor-controlled heating element, precise control, no wear and no noise.

EAF dust removal system on two key issues resolved

First, the dust removal system process
1, widely used in process
An electric furnace exhaust, electric furnace roof airtight cover and factory smoke and secondary refining furnace, feeding system exhaust, fan pressure into an electric furnace dust removal system combines mains gas trapping, dry bag filter dust removal method, negative pressure operation of the process.
2, PLC automatic control
(1) Pulse (set time or differential pressure) cleaning dust.
(2) automatically adjust according to each condition smelting dust trap point wind, air pressure and fan power.
Second, the key technical issues
1, the quality of the filter dust bag
The quality of media choices, decisions of the dust collector running resistance and operating costs, investment costs, directly affecting dust emission concentration.
2, cleaning technology
Cleaning performance has a direct impact on the efficiency filtration rate and bag life.
3, flue gas temperature
Flue gas temperature control directly affect the airtight cover and factory smoke effect roof, furnace, micro vacuum forming and bag life.

Technical specification for safety furnace (fixed hearth chamber furnace)

1, safe, all furnace must have the following components and safety facilities. The outlet temperature of the automatic adjusting means; the feedstock oil automatic control means; furnace, convection, furnace tubes, radiation, temperature indication of the flue;
Population and superheated steam pressure gauge furnace; damper and flue baffle; emergency venting devices; blast doors; hearth and back elbow tank fire steam line.
3. The new furnace according to prescribed procedures must be put into use, the heating curve Ovens.
4. Furnace ignition off good hole, the flue baffle opening to 1/3 1/2, fuel oil systems circulation and circulation of raw materials, ready to soak diesel ignition stick.
5. Ignition steam furnace residue gas rush the net, on the upper end of the burner will ignite ignition rods, others to leave the bottom of the furnace, steam slightly open, and then open the oil line. Point fuel fire, regulate oil and gas than to a normal state.
6. Cited gas off the net water storage and condensed oil and drained in a safe place for more than 15 minutes, the laboratory analysis of the oxygen content of less than 1%, before the vote with the ignition. Gas into the blast furnace must pass the flame arrester.
7. Ignition fireman can not face the fire mouth and see the fire window to avoid tempering wounding. If the flame goes out, the fuel valve should be closed immediately, the furnace domestic demand steam purge in order to re-ignition.
8. Normal operation should always check the stove burning at any time to adjust, pay attention to check whether the tube bending, bubbling, peeling, redness and dark abnormal situation, pay attention to check back elbow, plug, entrances valve flange seamless oil phenomenon, abnormal, and immediately reported to the leadership, to take measures to deal with.
Case of burn-through caused by a ruptured tube furnace of fire or an emergency need into the furnace, the application of steam to put out the fire cooling treatment, no water is injected into the furnace for fire fighting and cooling.
10 into the furnace overhaul should handle into the equipment and operating procedures. Explosion-proof doors shall not be blocked with other objects, so as not to lose the explosion-proof effect.
11. Safety furnace heating or shutdown cooling must be strictly in accordance with the provisions of the heating and cooling rate.
12 emergency shutdown, against only wind instrument used to close the control valve, be sure to close the blast furnace hand valve.
(13) In case of the heating medium interrupts should immediately fire the furnace pass into the steam.

Pre-vacuum chamber furnace

Forvacuum box-type furnace is a single-chamber structure, the workpiece is heated under a protective atmosphere, the temperature of the heating chamber atmosphere heat treatment process is controlled by computer PLC, without manual intervention, will minimize human disturbance factors, is an automated a high degree of heat treatment equipment.
Pre-vacuum chamber furnace design requirements:
Pre-vacuum chamber furnace designed according to customer requirements, mainly used for stainless steel precision castings annealing, the device considers factors:
1. Production capacity: customized according to customer requirements.
2. Operating temperature: commonly used temperature of 850 ° C -920 ° C maximum temperature 950 ° C
3. Smart meter + SCR temperature control system to improve the control precision, saving energy (more than 30% energy saving than the on-off), reducing the impact on power.
4. Additional protection medium injection device and furnace pressure, the injection volume of the dosing medium to protect the workpiece is not oxidized.
5. A four-link door seal structure, with water cooling jacket and silicone rubber sealing device to ensure that the protective gas in the furnace is not compromised, to ensure that the pressure in the furnace, the heat loss is not easy.
6. Using the drag-lift type of materials into and out of institutions, to reduce the weight of the material basket, to improve the life of the material basket, reducing costly heat-resistant steel consumption.
7. Heat-resistant steel mixing fans, the furnace temperature uniformity up to ± 5 ° C (air furnace), to ensure product quality.
8. Imports of the light impervious C brick, heated indoor layer to reduce heat loss, further energy savings.

Trolley furnace overhaul Precautions

1 with corrosive, volatile, explosive gases into the furnace processing of the workpiece is strictly prohibited, so as not to affect the heating elements and refractory life and cause explosions and other accidents.
(2) shall not exceed the furnace temperature operation, otherwise it will shorten the life of the equipment.
3 oxide into the blast furnace of the workpiece to be too clear, available under the wire brush.
4 piece uniform stacking, from the heating element should be around 100-150mm.
5 is strictly prohibited barbaric operation, the workpiece should be light, to avoid shocks.
6 used furnace operator must not leave jobs, you must always pay attention to the working conditions are normal furnace.
7 furnace during loading and unloading the workpiece, you must first cut off the heating element power to ensure operator safety.
8 furnace oxides (including electric wire under) should always be cleaned at least once a week or five times a furnace. Furnace blowing with compressed air under the floor.
9. Resistance wire as it used, you can not bend the collision to avoid breakage.
10 furnace motor requiring regular inspection, lubrication, etc., pay attention to the use of safety.
11 at the shaft sleeve must always check lubrication to prevent damage due to lack of oil and bushings.
12. Periodically check the use of the heating element. The heating element is not kinked short-term use after the collision. If you have not heavily corroded and broken, can be used with the electric wire of the same material (or electric wire itself) as an electrode, the use of acetylene gas for heating welding electrodes using 50% Baiyun powder mixture, if the heating element can not be used when severe corrosion, should be replaced.
13 Regular calibration instruments, thermocouple usage prevent instrumentation, thermocouple temperature measurement errors caused by incorrect affect product quality.

Trolley type PTFE sintering furnace features

1 trolley PTFE sintering furnace insulation properties, the furnace temperature uniformity, set any sintering curve, in the same time, the same temperature value. Furnace temperature error is ± 1 ℃, 1000 hours of operation without time error.
2 stainless steel chamber lining and dial, never rust.
Exhaust purification by activated carbon treatment after discharge pipe, pollution, environmental performance.
Single set of program-controlled sintering Muffle furnace: the preparation of any sintering curve by the sintering process, the device is activated, the rise time and temperature, holding time and temperature constant value characteristics.
Group program-controlled sintering furnace: You can also be incorporated into the sintering curve, according to the the product sintered requirements at any time call.
Network multiple sets of program-controlled sintering furnace: no paper record, may have an infinite set of programming. Record sintering file that can be sustained for one year. Can achieve the sintering furnace running at the same time, and remote control.

Indirect resistance furnaces measurement, control and recording of electric equipment basic technical conditions

1 thermocouple:
Selected by resistance furnace thermocouple should meet its requirements, the indexing should be consistent with the provisions of the relevant national standards, have appropriate protection tube thermocouple, thermocouple wire in order to avoid the impact of media by the furnace. Unless otherwise specified or required (see section 9.2), the length of the industrial resistance furnace thermocouple leads should not be less at 7.5m. The material of the thermocouple leads should be the same as the thermocouple, or use the thermoelectric properties of the thermocouple wire compensation wire.
Two temperature instruments with:
Resistance furnace temperature control area shall be provided with instructions, control and record the temperature of the furnace temperature necessary instrumentation. Temperature meter shall be marked on the indexing number has been equipped with a thermocouple. In addition to making minor adjustments, the thermocouple lead wire or the compensation wire length should not affect the accuracy of the instrument.
3 temperature meter types and their accuracy:
The technical level of resistance furnace with temperature meter divided into the following three categories:
C-level resistance furnace should be equipped with an accuracy of 0.25 or better instrument, the instrument should have automatic compensation of the thermocouple reference junction temperature.
Class B or Class A resistance furnace should be equipped with an accuracy of 0.5 or better instrument.
When otherwise required or demanded (see section 9.2), A-level resistance furnace can also be equipped with an accuracy of one meter.

Industrial oven works

Digital instrumentation through a connection with the temperature sensor to control the temperature, the use of hot air circulating ventilation, air circulation system is divided into horizontal and vertical. Were confirmed by accurate calculation, the wind source is driven by the wind turbine blower motor operation via electric heaters, hot air duct into the oven to the studio, and will use the air intake duct after a re-circulating heated air source use, so can improve the temperature uniformity. Be used as door switch, air circulation system can quickly restore operating state temperature value. Oven structure and working principle:
1, the structure of industrial ovens
Industrial ovens for the inner and outer layer structure, the shell of the angle iron steel sheet, inside and outside the double-shell filled with fibrous material between. Industrial ovens used mostly aluminum silicate fiber material, it can play the role of insulation, forming a reliable insulation. Industrial ovens equipped with hot air circulation system and temperature measurement and control systems.
2, the principle of industrial ovens
Industrial ovens muffle furnace at work, the operator through the meter and temperature sensor to get inside industrial oven temperature value by the control system to operate. Industrial hot air circulation oven heating, cooling and heating mode compared to normal, with better gas flow, can speed up the industrial oven drying rate of the material.
Industrial ovens hot air circulation system consists of blower motor, wind turbine and electric heater components, air motor driven wheel sends cold wind, cold wind carries heat through electric equipment after heating duct into the industrial oven oven studio.
Industrial oven of hot air circulation system can improve the uniformity of the air temperature in the industrial oven door switch during the transportation of materials, the temperature value may be affected by a change in the uniformity of the air circulation system is conducive to the maximum recovery fast degrees operating state temperature.
 

The basic sequence of experimental furnace masonry and methods

Laboratory furnace, furnace masonry and methods of the basic sequence is as follows:
① bottom masonry, including the passage at the end. Qi Hao large brick insulation brick and kaolin after the masonry wall at the inside and outside to relax 30-50mm leveling. Multilayer structure underground masonry elevation negative deviation must be controlled, the bottom of the total thickness tolerances generally-3mm. In the bottom layer of kaolin large brick laying above chrome ramming as a sealing layer to prevent liquid penetration to the corrosion resistance of glass poor clay layer.
② In the bottom steel structure on the basis of acceptance, according to the baseline and experimental furnace construction furnace, furnace centerline release related to feeding port, front and rear bubbling and forming pathway of Taiwan brushed drain board centerline.
③ lifting column. Interim measures to stabilize the column, and then install the ballast ballast according to design requirements angles, columns and ballast ballast angle must be close to the same time determined the exact elevation.
④ masonry wall, including the passage wall. The bottom brick masonry wall must ensure that the level of degree, or to the bottom of the tile area for processing until it reaches the requirements. Multi-wall brick building, the first in the field after the operation to make sure the furnace size, non-timber hewn side facing brick hearth. Masonry joints to be staggered corner pressure, strictly maintain verticality.
⑤ masonry parapet, the front wall, back wall and channel flame space. Masonry parapet bracket should be carefully examined, pallets and bearers installed after passing. Masonry brick and chest wall hooks have taken measures to prevent the dumping of the kiln.
⑥ big arch masonry. Production arch tires, do carry through gantry sedimentation test and check the corresponding size, the big arch masonry to the center from both sides simultaneously, and requires continuous operation, try to control! * + Complete. Large arch insulation layer construction after the end of the kiln to be baked.
⑦ masonry flue, chimney. Kiln debris must be cleared, and with a vacuum cleaner after masonry. Laboratory furnace, furnace flue and chimney masonry, but also compatible with the metal heat exchanger, access paths masonry chimney must be completed before other masonry.
Is there any way masonry kilns?
Masonry method of wet and dry assemble puzzle two ways:
Wet puzzle parts: the Ministry of flames melted the side walls and arch roof space, flue, chimney and furnace insulation bricks, masonry used in the wet mud should be based on material used in the preparation of the corresponding fire clay bricks.
Dry assemble parts: melting section and the bottom path, wall, brick fire space parts of the hook, melting section and flue arch arch bricks, fused brick and path roof tiles.
Well-designed laboratory furnace, furnace, must be carefully masonry, masonry quality for life of the furnace, fuel consumption, glass melting and drawing operations has a significant impact.

Box-type furnace use | resistance furnace Precautions

High temperature box furnace | Furnace Products
High-temperature box furnace |, resistance furnace shell is made of high-quality cold-rolled steel plate, the surface coating process, over the door using the door structure, flexible opening and closing.
High temperature box furnace | Furnace NOTES:
1. The first time or again after long-term use should be disabled for oven temperature 200 ~ 600 ℃, time of about 4 hours.
(2) When used shall not exceed the maximum temperature furnace temperature, and do not work long hours at the rated temperature or more.
(3) Operating environment No flammable materials and corrosive gases.
4 To ensure your safety, you must install the ground, and well grounded.
5 Use the light off when the door opened to light, to prevent damage to the parts.
6 in the furnace to take samples, you should first turn off the power, and gently, in order to ensure safety and to avoid damage to the furnace.
7 To extend product life and ensure safety, use of the muffle furnace device should be promptly after the end of the sample was removed from the furnace exit the heating and power off.
8 regular watch on local conditions and the combustion gas pressure;
9 - Open the door can not stand them, to prevent the flame jet burns;
10 Note whether the combustion burner into sections and wedge the door with torches check for leaks;
11 found in the work burner flame goes out, you should immediately turn off the gas valve, close the air valve;
12 working parts from falling or wedge the door switch not working, you should stop feeding, remove the parts.

Experimental furnace heating wire classification

Including iron-chromium alloy heating wire and nickel-chromium alloy heating wire into two categories. The former is a ferritic alloy tissue, which are austenitic alloys. In addition, there are some special purposes such as tungsten filament heating alloy wire, molybdenum wire and other laboratory furnace according to different purposes, to different temperatures, choose a different electric wire.
Laboratory furnace with electric wire electric iron chrome aluminum alloy material is characterized by:
1. Use of high temperature, such as HRE iron-chromium alloy wire in the atmosphere maximum temperature up to 1400 ℃, which is the laboratory furnace maximum temperature can reach 1,400 degrees, if you need to design more than this temperature laboratory furnace, you need to select another The electric wire;
(2) long life;
3 Allow the surface of the load is large;
4 good oxidation resistance, and its oxidation to generate AI2O3 film has good chemical resistance and high electrical resistivity, specific gravity less than nickel-chromium alloy, high resistivity.
5 sulfur resistance is good;
6 prices significantly lower than nickel-chromium alloy;
7 disadvantage is that as the temperature increases, the performance of plastic, high temperature strength is low.
Laboratory furnace nickel-chromium heating wire is characterized by:
1, high strength at high temperatures;
(2) long-term use and then cooled down, the material does not become brittle;
3 fully oxidized nickel alloy ming the radiation rate ratio Fe-Cr alloy high;
4 non-magnetic;
5 In addition to the atmosphere of sulfur, the better corrosion resistance.
Laboratory furnace alloy heating wire shortcomings
Alloy heating wire is the most widely used, the largest amount of heating materials. Its disadvantage is its working state is very high temperatures (hot state), prone to oxidation in air blown reaction; electrothermal energy conversion aspects from analysis due to energy loss leaving visible light generating section; electric wire is often Use a spiral state, power is generated when inductance effects.

Vacuum hot pressing furnace use Common Faults and exclusion method

High vacuum pumping on but does not leak ( muffle furnace mean value of the vacuum table for a long time does not move)
Possible causes:
1. High vacuum gauge tube aging
2. Diffusion pump oil aging
Solution: Replace the vacuum gauge; replacement diffusion pump oil.
But not on the low vacuum pumping does not leak (mean value of the vacuum table for a long time does not move)
Possible causes:
1 low vacuum current regulatory work incorrectly.
2. Mechanical pump oil aging
Solution: Adjust vacuum gauge tube current; replacement of mechanical pump oil.
Thermocouple automatic access failure, warning lights alarm
Possible causes:
1. Inner and outer limit failure.
2. Out of the motor does not turn.
Solution: Adjust or replace the external stopper; tests whether the motor has been broken, such as the replacement of the same type of motor bad. (Note) within the furnace limit should be observed before heating indicator light should be lit.
After a period of time the temperature does not rise up
Possible causes: heater resistance value becomes larger.
Solution: According to instructions to transfer large instrument output power; serious aging can only be replaced with a new heater
Incase control panel lights are on and the police overcurrent
Possible causes: heater shorted
Solution: Open the lid heater observe whether there is a short circuit, troubleshooting.
Over-temperature alarm and alarm lights on
Possible causes:
1. Over-temperature furnace
2. Instrument is set incorrectly
Solution: Press the manual reset over-temperature alarm parameters
Without water is lit and the alarm
Possible causes:
1. Valve did not open
2. Water pressure is too low
Solution: Open the valve; increase water pressure.

Mesh belt type continuous heat treatment furnace introduced:

Mesh belt type continuous heat treatment furnace electric heating, non-connected to the shape of parts placed on the network belt drive mesh belt running through the drive mechanism, so that the workpiece to be processed continuously through the furnace, step-by-step through the replacement, the warm-up heating, the average temperature, insulation, cooling process, so as to achieve the purpose of bright heat treatment. Mesh belt type continuous heat treatment furnace according to the type of temperature and external configuration, mainly applied to the metal material parts by bright annealing and sintering of metal powder.
Mesh belt type continuous heat treatment furnace working principle:
Mesh belt type continuous heat treatment furnace is the use of intermittent forward network with the workpiece through the temperature-controlled heating zones, and then fall into the quenching tank by the elevator automatically remove the mesh belt washing machine for degreasing cleaning, drying, and finally transport to mesh belt furnace for tempering continuous heat treatment production line. It in a controlled atmosphere heat treatment process of hardening, a thin layer carburizing, carbonitriding infiltration. During the heat treatment, the workpiece between the collision, a balanced manner through the furnace was heated, together with the role of the controlled atmosphere to prevent the incursion of air furnace. Therefore, the treatment, the workpiece surface is smooth, no decarburization, uniform hardness, deformation is small, high quality. The production line has a high degree of automation, easy to adjust the parameters, low labor intensity, do not pollute the environment, energy conservation, etc..
Mesh belt type continuous heat treatment furnace Scope:
Mesh belt type continuous heat treatment furnace for heating temperature quenching, carburizing and carbonitriding and subsequent tempering. Widely used in mass production of small parts such as fasteners, chains, bearings, small weapons, hardware tools, elastic components, sewing machines, bicycles, car and motorcycle parts the smooth hardening under protective atmosphere or thin carburizing and carbonitriding permeation. According to the different kinds of steel, can be water, oil or molten salt quenching tank quenching agent.

Selection of the heating element resistance furnace

A. Select the basic elements of heating elements
1. According to the temperature: (heating element temperature = furnace temperature +100- -200 degrees)
General furnace temperature is less than 1000 degrees, the choice of NiCr, FeCrAl
Furnace at 1000-1200 degrees, use FeCrAl (Cr27Al7Mo2)
Furnace temperature greater than 1200 degrees, the choice of pure metal or nonmetal
2. According to structural characteristics of the furnace
3. Treatment of the workpiece according to the situation
4. High radiation efficiency
5. Convenient source
Two. Select the heating element should have the following properties
High resistance, cross-sectional area, good mechanical strength, thermal expansion coefficient some chemical stability
III. Heating element surface load (W) select
1. W greater the shorter the life
2. High resistance furnace temperature, corrosive atmosphere, W is to take a small
3. Heating element with shield (such as car heaters, heating elements in the furnace under the floor), W is to take a small
4. Furnace can be ventilated, W whichever is greater (can be increased 30-50 percent)
5. Ribbon elements, W whichever is greater (can be increased 30-50 percent)
6. Replace difficult element, W to take a small
Four. Alloy element surface load Recommend
Material heating element temperature (unit: ° C)
Less than 1000 less than 1,100 less than 1200
OCr25Al5 1.6 - 1.8 1.2 - 1.5 0.81
Cr20Ni80 1.1 0.5 - 0.8
Cr15Ni60 0.8
CrAl7Mo2 at 1200-1300 degrees, W is taken 1.6-1.8
Five. Pure metal surface load
W, Mo, Ta less than 1800 °, W is taken 10-20W/cm2
Graphite W Less than 15-20W/cm2

 

Vacuum atmosphere furnace maintenance required

Environmental testing equipment variety, but the most widely used environmental test equipment for the heat, cold, heat vacuum atmosphere furnace. Hot and cold impact testing machine, for example, to talk about the vacuum atmosphere furnace construction and some of the common faults and troubleshooting.
Some vacuum atmosphere furnace and troubleshooting common faults:
1 in the high-temperature tests, such as temperature changes reach the test temperature value, you can check the electrical system, each troubleshooting. Such as the temperature rose very slowly, we must view the air circulation system, look at the wind circulation damper is open properly, otherwise, check the air circulation motor is functioning properly. Such as temperature overshoot badly then you need to set the parameters of PID tuning. If the temperature rise directly, over temperature protection, then the controller failures, to be replaced control instrument.
(2) during the operation of the test equipment suddenly fails, control instruments corresponding fault appears on the display prompts and a voice alarm. The operator can control the operation of the device using the troubleshooting chapter quickly check out which category failure, you can ask professionals quick troubleshooting to ensure that the test correctly. Other environmental test equipment in use there will be other phenomena, it should be specific phenomenon, specific analysis and troubleshooting.
3 reach the test temperature indicator, then you have to observe the temperature changes, the temperature drop is very slow, the temperature to a certain value, or the temperature tends to increase, the former is necessary to check the laboratory vacuum furnace to make low-temperature test whether the studio before drying, so the studio remain dry and then do the test sample into the working chamber test, the working chamber of the test sample is placed too much, so that indoor air can not fully cycle, the exclusion of the above reasons , it is necessary to consider whether the failure of the refrigeration system, and so we must ask the manufacturer's maintenance professionals.

 

Through type muffle furnace, gas carburizing furnace heat treatment work safety rules

1. Blast furnace gas pipes should be checked to open the valve sealing and gas pipeline pressure is not less than the specified value.2. Air furnace test putter agencies, institutions and rod lifting mechanism work.3. Release of the compression spring to a predetermined size range.4. Regulate the water level in the water seal, seal exhaust combustion tube through the open valve, close the valve through the seal.5. The feed side of the oven door closed, turn on the discharge side of the door look, when kerosene spray mist flow direction normal form and then close the door.6. The feed chamber burner lit.7. Exhaust valve seal shall be discharged by the barrier.8. First, the intermittent production carburizing furnace tank.9. Parts placement, parts and not less than 5 mm distance between the parts; Part bottom edge does not exceed the specified length and height.10. To quickly switch the feed and discharge gate door, but the speed of push-pull rod to be stable.11. Parts should be located in a pre-cooling chamber is below the thermocouple.12. Furnace filled with 24 chassis only allowed to continue feeding must first pull push.13. When we shutdown the furnace zone down to the same temperature, and then began to naturally cool.14. Equipment cleaning:(A) in the continuous production carburizing furnace tank cleaned once a week, intermittent production furnace tank cleaning should be carried out immediately after shutdown,(2) tank cleaning oven temperature is 850 ~ 870 ℃ when the chassis all out;(3) a nozzle with compressed air blown from the feed end of the furnace, the valve opening was not too much, blowing must move around, to prevent local overheating;(4) In the carburizing gas burner with kerosene before cleaning.15. Chassis or fixture should return after quenching chilling room to remove oil.16. Found that the exhaust pipe blockage (sudden increase in pressure inside the furnace) should be cleaned up immediately. First open the exhaust valve seal barrier, and then close the valve exhaust pipe through the water seal. Cleared should hit the exhaust pipe valve seal the opening, and then close the barrier seal exhaust valves.17. Note:(A) combustion conditions and constant attention to districts gas pressure;(2) Open the door can not stand them, to prevent the flame jet burns;(3) Note whether the combustion burner into sections and wedge the door with torches check for leaks;(4) found in the work burner flame goes out, you should immediately turn off the gas valve, close the air valve;(5) working parts from falling or wedge the door switch not working, you should stop feeding, remove the parts.

 

Tube furnace fire accident occurred when oil disposal measures

1, the first self-adjusting valve from the gas bypass valve at the gas cut off, lower the fire, when off the gas slowly to prevent tempering explosion.
2, a heat exchanger from the rich oil-rich oil outlet valve is closed into a tube furnace at the oil-rich, to prevent leakage of oil-rich continue to make fire intensified. De-oil rich in benzene column close the valve at the inlet tube furnace oil-rich tubular pipes, the pipe and other pipe furnace off.
3, surrounded by oil spillages with sand to prevent the spread of fire.
4, if the fire is not possible to place the furnace fire steam, the muffle furnace steam valve to open hearth fire put out the fire.
5, from the door of the joints foam firehouse with fire hoses connected to the foam bubbles firehouse. Tube furnace with foam fire on parts of the fire.
6, the most critical to control the outflow of gas and oil-rich, to prevent the fire intensified.

 

What laboratory furnace masonry carried

Laboratory furnace, furnace masonry and methods of the basic sequence of what? Laboratory furnace method of wet masonry masonry and dry assemble two kinds: Wet puzzle parts: the Ministry of flames melted the side walls and arch roof space, flue, chimney and furnace insulation bricks, masonry used in the wet mud bricks used should be based on refractory clay material prepared accordingly.
① laboratory furnace bottom masonry, including the passage at the end. Qi Hao large brick insulation brick and kaolin after the masonry wall at the inside and outside to relax 30-50mm leveling. Multilayer structure underground masonry elevation negative deviation must be controlled, the bottom of the total thickness tolerances generally-3mm. In the bottom layer of kaolin large brick laying above chrome ramming as a sealing layer to prevent liquid penetration to the corrosion resistance of glass poor clay layer.
② In the bottom steel structure on the basis of acceptance, according to the baseline and experimental furnace construction furnace, furnace centerline release related to feeding port, front and rear bubbling and forming pathway of Taiwan brushed drain board centerline.
③ lifting column. Interim measures to stabilize the column, and then install the ballast ballast according to design requirements angles, columns and ballast ballast angle must be close to the same time determined the exact elevation.
④ masonry wall, including the passage wall. The bottom brick masonry wall must ensure that the level of degree, or to the bottom of the tile area for processing until it reaches the requirements. Multi-wall brick building, the first in the field after the operation to make sure the furnace size, non-timber hewn side facing brick hearth. Masonry joints to be staggered corner pressure, strictly maintain verticality.
⑤ masonry parapet, the front wall, back wall and channel flame space. Masonry parapet bracket should be carefully examined, pallets and bearers installed after passing. Masonry brick and chest wall hooks have taken measures to prevent the dumping of the kiln.
⑥ big arch masonry. Production arch tires, do carry through gantry sedimentation test and check the corresponding size, the big arch masonry to the center from both sides simultaneously, and requires continuous operation, try to control! * + Complete. Large arch insulation layer construction after the end of the kiln to be baked.
⑦ laboratory furnace masonry flue, chimney. Kiln debris must be cleared, and with a vacuum cleaner after masonry. Laboratory furnace, furnace flue and chimney masonry, but also compatible with the metal heat exchanger, access paths masonry chimney must be completed before other masonry.

Oven proper use instructions

The use of oven
1. Use of environmental requirements:
a) Temperature: 5 ~ 40 ℃
b) Relative humidity: ≤ 85% RH
c) Power supply voltage: AC220V ± 10% 50Hz
d) four weeks without a strong vibration and corrosive gases affect
2 vacuum debugging:
a) The box door and tighten the door handle in place, closed discharge valve (the rubber stopper holes with the holes on the release valve twisted partial 90 °), open the vacuum valve (by the counterclockwise rotation 90 °), the first time you use the vacuum valve switch may be tight, be forced to rotate.
b) Using random accessories vacuum connection tube (inner diameter: Φ16mm thickness: 10mm) vacuum drying oven exhaust pipe (diameter: Φ16mm) and a vacuum pump (2XZ-2 type, the inlet diameter Φ16mm) connected securely (6090 and 6210 already connected). Vacuum pump connected to the power and began pumping seriously empty table indicates values ??reached-0.1Mpa, the first closure of the vacuum pump valve closed after power to prevent vacuum pump oil to flow back into the studio, this time in a vacuum chamber.
3 oven vacuum box debugging:
In the vacuum, after debugging, can be manipulated as follows:
a) Turn the vacuum chamber, and the Power LED should light. Power On Self Test temperature controller, PV display the working chamber measuring temperature, SV display is factory set temperature. Temperature control device on the AT and HEAT and other lights should be lit, heated instrument to enter the working state.
b) to modify the set temperature oven
1 Click temperature controller function key (SET); PV display SP characters, the available key head button to set the temperature changes.
(2) After modification, press the SET button, PV display ST characters, set the timer time.
 If you do not use the timer function, you can still let ST = 0
3 Press the SET button, the screen display studio temperature PV, SV screen displays the new set temperature. AT AND HEAT instrument lights, then re-enter the meter heated working condition.
c) When operating the indoor temperature close to the set temperature, HEAT lamp light suddenly flickered, which means that the heating stage to enter the PID regulator, the instrument is sometimes measured temperature exceeds the set temperature, sometimes below the set temperature is normal. When measuring the temperature close to or equal to the set temperature, and then after the studio until 1 ~ 2h enter a constant temperature, goods enter the drying stage.
d) the desired temperature is low, the second setting mode can be used, such as the required operating temperature 70 ℃, the first time to set 60 ℃, and other temperature overshoot began to fall, and then the second set 70 ℃ , so that the temperature can be reduced or even Du do overshoot, as soon as possible to enter a constant temperature.
e) when the goods drying is complete, turn the power off, if accelerated cooling, then open the bleeder valve so that the vacuum is 0, for 5 minutes or so call box door.
(4) If the working chamber of dry matter humidity, water vapor generated will affect the performance of the vacuum pump is recommended between the oven and the vacuum pump, string into a "Dry / filter."
5 If the drying process of the article, you need to add nitrogen and other inert gases, should be specified in the contract, was equipped with an inlet valve.
(Note: 1. If the pump properly and meet the technical requirements, can not vacuum, then open the door to use the product in the annex to wrench the door button on the box screwed to the inside circle to close short, re-close the door. 2 This vacuum oven can not be used as an electric oven, because the studio is not in a vacuum state, measuring the actual temperature and the working chamber temperature error great)

Industrial furnace with ceramic fiber products Features

1, the installation process, the lifting of blanket folded after bundling will have an enormous stress, crowding each other sealed without leaving any gaps.
2 ceramic blanket high-dimensional elastic deformation of the furnace shell can make to reduce construction costs. Meanwhile, the different components inside the furnace can make different changes due to heat generated by the gap.
3, due to light weight, low heat capacity (only for light and light resistant refractory lining of 1/10), can significantly reduce the furnace energy consumption in the operation control.
4, elastic fiber blanket can withstand mechanical force.
5, with the ability to resist any thermal shock.
6, the lining of the body without drying and curing, lining construction is completed ready for use.
7, chemical stability. In addition to phosphoric acid, hydrofluoric acid and alkali, the other acids, alkali, water, oil, steam, not being eroded.

Tool heat treatment process operating skills

The majority of the heat treatment process cycle operation is a collective operation. Therefore, heat treatment processing technology boundaries are not clear, such as a number of parts quenching may be completed by the two shifts, quenching and tempering often consists of two service completion, coupled with the uneven quality of workers, small enough to improve management practices, production The process often appears quality problems. Problems, analyze problems, to find out why, is not only time-consuming, laborious, and sometimes can not find the real reason.
1 carburized gear low hardness
Record 800 (capsule) the infusion Unicase gas carburizing furnace nitride carburized gear claim after carburizing surface hardness 58 ~ 63HRC, when the sampling parts of the surface hardness of 52 to 56HRC. Carburizing, quenching; quenching heating or cooling problem, and sometimes difficult to conclude. Emergency batch of gear production tasks, the author has been detected gear to take three tied with wire, re-heated in a salt bath furnace, quenching in an oil bath, about 30 ~ 40 minutes after the last detected quenching hardness 63 ~ 65HRC . Hardening group of gear pump Jian hardness, all qualified. This way to cut the Gordian knot, although not necessarily able to identify the real cause of the problem, but to solve the urgent needs of the production.
2 bar quenching cracks
There are a number of 14mm x 240mm 40Cr the pensions materials by quenching and tempering is buried, after about a week (when used) was discovered almost all the crack, the crack shape the longitudinal single crack, the majority of crack through both ends of the bar surface. Judge quenching cracks crack the duty operator has failed to honor it. Check the job log, can only be found in the the batch bar for the second class quenching, three shifts tempering, parts and materials, quenching temperature and the cooling medium and process parameters are not recorded. I take a bar with 45 steel joints with heated in a salt bath furnace, and then quenching in salt water, after cooling about 20 ~ 30 minutes, the bar cracking, and the shape of the crack and the crack shape. In the face of the facts, the operator admitted mistakenly batch bar as 45 steel quenched.
Box-type resistance furnace annealing uneven hardness
The process route: annealing → band saw cutting → the roughing → quenched → fine cars → grinding → nitride. Band saw cutting, often find a bar on the uneven hardness, the local high hardness, low efficiency of the cutting blade wear quickly. After analysis, the front bar length due to the installed furnace or bar. The box-type resistance furnace mouth neither heating resistance wire, heat loss, so for the average box-type resistance furnace, furnace installed parts from the furnace inside the mouth 200 to 300mm, in order to ensure uniform heating temperature of the furnace parts.
 4 cast iron quenching should be controlled micro-alloying elements
Thermal conductivity of cast iron. Poor, ships oil cold quenching. The matrix of the cast iron and steel, is also composed of pearlite and ferrite. Cast iron with high carbon content, the increase in carbon content can increase hardenability, but after all, do not increase. Therefore, to improve hardenability of cast iron: they rely on micro-alloying elements in cast iron control good content of alloying elements, in order to ensure the quality of heat treatment and quenching.

Resistance furnace maintenance and repair

Electric body damage for the following reasons: mechanical force damage.
In the manufacture and repair of electric furnace, sometimes to his wound resistance wire, during processing, do not damage the surface, such as scratches or other injuries jaw folder. In addition, non-ferrous metal production winding jig can not be used, because the non-ferrous metal alloy particles tend to stick on the wire surface, the alloy wire is wound easily broken, reduced service life. After winding of the spiral body to eliminate the adhesion of dirt should be clean.
Furnace loading products should be avoided and electric body collision, especially iron-chromium-aluminum, the repeated use of brittle grain growth, the higher the temperature, the longer, the more severe embrittlement after cooling. Therefore, the high temperature of the iron-chromium-aluminum components used in the cooling, do not stretch, bend and impact.
Silicon carbide and silicon molybdenum rod texture is very crisp, the installation process should not touch off.
Demolition, the first clamp and plate for unloading, carefully remove the tube and silicon carbide ceramic refractory fibers between, out of the damaged components, and observed the upper and lower (or left and right) of the ceramic tube centerline of whether a re-synthesis line. And then install the new silicon carbide.

Furnace (car bottom furnace) Introduction and safety technical regulations

Car Bottom Furnace Products:
For weight of more than ten tons to hundreds of tons of ingot heating before forging, furnace room or tunnel-type. Heated objects placed in the trolley, furnace loading and unloading by the workshop crane or other traction devices trolley pulled into or out of the furnace, the large ingot heating requirements furnace temperature evenly distributed, car bottom furnace is often a distributed heating burner and smoke crossing dispersion and dispersion of smoke (arranged on the side wall of the furnace).
Technical specification for safety:
1, safe, all furnace must have the following components and safety facilities. The outlet temperature of the automatic adjusting means; the feedstock oil automatic control means; furnace, convection, furnace tubes, radiation, temperature indication of the flue;
Population and superheated steam pressure gauge furnace; damper and flue baffle; emergency venting devices; blast doors; hearth and back elbow tank fire steam line.
3. The new furnace according to prescribed procedures must be put into use, the heating curve Ovens.
4. Furnace ignition off good hole, the flue baffle opening to 1/3 1/2, fuel oil systems circulation and circulation of raw materials, ready to soak diesel ignition stick.
5. Ignition steam furnace residue gas rush the net, on the upper end of the burner will ignite ignition rods, others to leave the bottom of the furnace, steam slightly open, and then open the oil line. Point fuel fire, regulate oil and gas than to a normal state.
6. Cited gas off the net water storage and condensed oil and drained in a safe place for more than 15 minutes, the laboratory analysis of the oxygen content of less than 1%, before the vote with the ignition. Gas into the blast furnace must pass the flame arrester.
7. Ignition fireman can not face the fire mouth and see the fire window to avoid tempering wounding. If the flame goes out, the fuel valve should be closed immediately, the furnace domestic demand steam purge in order to re-ignition.
8. Normal operation should always check the stove burning at any time to adjust, pay attention to check whether the tube bending, bubbling, peeling, redness and dark abnormal situation, pay attention to check back elbow, plug, entrances valve flange seamless oil phenomenon, abnormal, and immediately reported to the leadership, to take measures to deal with.
Case of burn-through caused by a ruptured tube furnace of fire or an emergency need into the furnace, the application of steam to put out the fire cooling treatment, no water is injected into the furnace for fire fighting and cooling.
10 into the furnace overhaul should handle into the equipment and operating procedures. Explosion-proof doors shall not be blocked with other objects, so as not to lose the explosion-proof effect.
11. Furnace heating or shutdown cooling must be strictly in accordance with the provisions of the heating and cooling rate.
12 emergency shutdown, against only wind instrument used to close the control valve, be sure to close the blast furnace hand valve.
(13) In case of the heating medium interrupts should immediately fire the furnace pass into the steam.

Air-cooled vacuum sintering furnace

Air-cooled vacuum sintering furnace is introduced:
Air-cooled vacuum sintering furnace, by using the method of resistance heating can be achieved for rare earth permanent magnet sintering, purification of hydrogen storage material, electrical alloy bright annealing, brazing material such as stainless steel, precision alloy, tools, measuring and cutting, heat treatment. This equipment has high degree of vacuum, forced inside and outside air cooling circulation, cooling speed, mean temperature sex good, high automatic degree, etc.
Air-cooled vacuum sintering furnace use:
Cooled vacuum sintering furnace is a vacuum resistance is a new generation of vacuum heat treatment equipment. He has a high degree of vacuum, forced air cooling speed, high efficiency, good temperature, high degree of automation, etc. Legal system is mainly used for dry powder of vacuum sintering magnetic materials, hydrogen storage material of homogeneous purification and tools, precision alloy heat treatment, etc.
Air-cooled vacuum sintering furnace structure:
Air-cooled vacuum sintering furnace is horizontal structure, consists of furnace body, heating chamber, vacuum system, air cooled heat exchanger system, water cooling system, pneumatic system and electric control system components. Furnace for water-cooled wall structure, loading and temperature measuring thermocouple, etc. Heating chamber of the heating body made of molybdenum sheet, and selects the advanced thermal insulation material of incubator, heating process for the three sections of temperature control, can improve the temperature uniformity. Air-cooled heat exchanger by outer circulating system, after heated gas through a heat exchanger, blower driven, and back hot spray to the work, make its rapid cooling. Control system mainly consists of two parts, electric control cabinet and magnetic voltage regulator. Temperature is controlled by microprocessor program temperature recorder PC programmable controller and configuration actions of institutions, such as process control. Vacuum system adopts large pumping speed and dust catcher of high vacuum diffusion unit pump, diffusion pump, roots pump, vane pump.

Muffle furnace heating element

The heating element is an important member of the resistance furnace is a resistance furnace heat sources. Understand the performance, structure and characteristics of the heating element material, it is very important for the correct use of the resistance furnace.
Surface load of the heating element and the shape
Surface load of the heating element
When the current through the heating element, due to the role of the resistance of the heating element, the electrical energy into heat energy conversion law in line with Joule's law. Heating element electrical energy into thermal energy by heat conduction, convection and radiation distributed to the furnace, the ability to disseminate the surface load. The surface load of the heating element is defined as the power per unit area on the surface of the component can be distributed W/cm2. The larger the surface load of the heating element, the more heat comes out of the heating element itself, the higher the temperature. Consider increasing the element surface of the load may be correspondingly reduced surface area of ??the heating element, reducing the amount of heating elements, but is not conducive to the lifetime of the elements from the heating power of the resistance furnace. Conversely, reduced element of the surface load can be a corresponding increase in the surface area of ??the element, and is conducive to the lifetime of the elements, but increased the amount of the heating elements. In addition to the cooling effect of the surface load on the heating element, its shape also have a certain impact, in general, the ribbon components than the linear thermal conditions, the surface load.
Common shape of the heating element
The shape of the heating element depending on its material and installation, linear, spiral, mesh, ribbon and the rod-shaped structure, wherein the metal heating element is generally linear, spiral, a mesh or a ribbon, as opposed to metal heating element is generally rod. Linear heating elements in the oven cavity made of metal wire around certain requirements from the system; spiral heating element is wound into a spiral wire first and then install the oven cavity; mesh heating element wire braid and into; ribbon heating elements are made of metal directly processed into.

Optimization atmosphere furnace cooling rate

Traditional depends mainly on the furnace atmosphere furnace cooling water circulation inside the sandwich away part of the heat, the cooling speed is relatively slow. Sometimes up to 36h or so to cool to about 150 ℃.
The high-performance cores require rapid cooling, the design presented in the following optimization program:
(1) Cycle Air Act: cooling the charge into the furnace through the nitrogen to pour out of the tower, and then into the furnace, recycled. Meanwhile, in order to prevent leakage, to continue to add part of the nitrogen gas into the furnace to ensure the nitrogen partial pressure in the furnace.
(2) Box bottom openings, and the cold side of the silicon molybdenum rod gap forming gas convection, take away box furnace heat;
(3) The box-type furnace purged with nitrogen, the heat away sintered product;
(4) accelerate the rate of water flow within the furnace sandwich. These types of programs can be used simultaneously, the cooling time can be shortened to about 15h.

The range of application of the high-temperature furnace

High-temperature furnace is the national standard energy-saving cycle operating furnace, mainly for steel products, a variety of metal parts normalizing, hardening, annealing heat treatment purposes, or diamond cutting blade for high-temperature sintering purposes.
High-temperature furnace Precautions
In addition to doing the experiment, do not stay in the area of ??high-temperature furnace tube.
Experimental work is completed, if not continue to use special gas, close reserved N2 flow tube maintained at the standby temperature and see if there are other power the customs not related, such as: cleanhood light, boiling acid with a small electric furnace or other, please turn off.
Dealing with HF, gloves, such as accidentally ran into HF, immediately flush with calcium gluconate plus 2% water, rub the wound 15 '.
Quartz glass products be used with care, so as not to rupture, causing severe cuts.
Avoid inhalation of smoke from the stove or treatment tank of gas.
Potassium cyanide (KCN) can not be set, because the two can produce highly toxic KCN gas mixed with acids.
Once found to interfere with the security of things, please immediately notify the relevant personnel (technicians).
Please save the amount of pure water.
Broken wafer, filter paper, cotton swabs ....... Do not fall into the drainage holes at the bottom of the cleaning tank, so as not to cause the floor to waterlogging due to poor drainage.
Length of putting the front end, not to facing up to avoid contamination.
Wafer into the baked mouth, to undertake the holder of the boat, do not touch the tube mouth, to avoid contamination of the furnace tube.

Furnace charging into the furnace and power transmission

First, the charge into the furnace:
Charge into the blast furnace, electric furnace steelmaking operations plan should be based on the ingredients in a single audit charge weight and alloy elements and ingredients and feed weight pad in the bottom 1 to 2% of lime.
Top loading baskets have someone directing, opened the lid, it should promptly baskets hanging into the center of the furnace may not be too high, too biased and too low. In baskets of chain plate is not bad as far as sticky lower. For the second feeding, not other primary materials entirely of clear before feeding, to avoid spraying and splashing of molten steel, but also to prevent the explosion, humid charge non-loading of the material into several baskets.
After charging into the furnace, for excessive burden should flatten or hanging out, so as not to affect the fastening lid while preventing the lid was arcing and leakage.
Second, the power transmission:
Charge into the furnace after the power transmission before the deal lid, electrodes, cooling system, mechanical transmission, electrical equipment, etc. for inspection, if found to be timely treatment failure, resulting in the smelting process in order to avoid downtime; also check the charge with the door or cooling system is touching, if exposed to immediately exclude, in order to avoid transmission after breakdown.
If the electrode is not long enough, it is best replaced before the transmission, such as loose fitting location, should be tightened in order to facilitate a Chuanjing success, reducing downtime caused by the phenomenon of the smelting process.

What are the advantages and EAF what are the disadvantages

1) Compared with fuel stove is easy to get high.
2) can be heated to an internal temperature from the material.
3) facilitate the controlled atmosphere furnace and the vacuum furnace used.
4) no fuel furnace exhaust furnace heat loss, so high thermal efficiency.
5) is easy to control the temperature, to facilitate remote control and fine tune.
6) capable of rapid heating.
7) Operating performance is good, do not pollute the environment.
Furnace shortcomings
A) the need to increase distribution equipment costs.
2) high cost of electricity.
3) resistance when the heating temperature exceeds 1000 ℃, refractory materials may be electrically conductive, insulating problems need to pay attention.