2013年9月11日星期三

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.


2013年9月9日星期一

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.

2013年9月7日星期六

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.

 

2013年9月6日星期五

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.

2013年9月5日星期四

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.

2013年8月30日星期五

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.

2013年8月26日星期一

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.