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Electric laboratory stove or muffle stove
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1. The shape of this series of resistance furnaces is rectangular, and the furnace shell is made of Angle steel and high quality steel plate by folding and welding. 2. The studio is a furnace made of refractory materials, in which the heating element is placed, and the insulation material is used to build the insulation between the furnace and the shell. 3. The furnace door is fixed on the electric furnace panel through multistage hinges. The furnace door is closed by using the deadweight of the furnace door handle to close the furnace door and the furnace mouth through the lever principle. In addition, there is a safety switch interlocking with the door at the lower end of the furnace mouth. When the door is opened, the power supply of the electric furnace is automatically cut off to ensure safe operation. 4, the temperature control system of the machine adopts microcomputer intelligent control, digital display temperature, equipped with a large Angle of view ammeter, can enable users to clearly observe.
This series electric box furnace is also called the laboratory electric furnace and muffle furnace, thermocouple and temperature and the corresponding console, can automatic temperature control of temperature measurement in the rated temperature scope, apply to the colleges and universities, scientific research and laboratory environmental protection unit, make an analysis, determination and metallographic research, or industrial and mining enterprises for high temperature sintering in air and metal workpiece for normalizing, annealing, quenching.
High temperature Muffle furnace is a kind of general heating equipment. According to the appearance shape can be divided into box furnace, tube furnace. How to judge the quality of high temperature muffle furnace can start from understanding the high temperature muffle furnace. You can tell by some of his characteristics.
The general name of high temperature Muffle furnace in China is as follows: electric furnace, resistance furnace, Maofu furnace, Mufu furnace.
High temperature Muffle furnace product features:
1, furnace body, intelligent controller split design, beautiful, generous, furnace door adopts side door design.
2, the use of two sides lining plate heating element, easy to replace the furnace wire, the use of imported ultra-high temperature heating element, oxidation resistance is more excellent, greatly increase the service life.
3, the use of ceramic fiber insulation, greatly improve the heating speed, and reduce the heat energy consumption, compared with the traditional muffle furnace weight reduced by 1/2, heating speed increased by 1 times, greatly saving energy, life increased by 3.5 times; Good heat preservation effect, low temperature outside the furnace
4, the use of imported temperature control instrument, new digital display, digital setting temperature, intelligent control output, can reduce visual reading and human operation error, greatly improve work efficiency.
5, with a variety of protective devices, improve the safety and reliability
6, independent control system, easy maintenance and replacement
7. There is an exhaust hole on the furnace body (air inlet and exhaust air can be added according to user requirements).
8. Other specifications can be customized according to user needs. All kinds of non-standard tube furnace, well furnace, box furnace
Maintenance method of Muffle furnace:
1. When Muffle furnace is used for the first time or used again after long-term disuse, it must be ovens. The oven time should be at room temperature 200℃ for 4 hours. 200℃ to 600℃ for four hours. When in use, the highest temperature of the furnace shall not exceed the rated temperature, so as not to burn the electric heating element. It is forbidden to pour all kinds of liquid and soluble metals into the furnace. It is best to work in Muffle furnace below the maximum temperature of 50℃, when the furnace wire has a long life.
2, Muffle furnace and controller must be in the relative humidity not more than 85%, no conductive dust, explosive gas or corrosive gas place to work. When metal materials with grease and other materials need to be heated, a large number of volatile gases will affect and corrode the surface of the heating element, so that it will be destroyed and shorten the life. Therefore, heating should be timely prevention and sealing containers or appropriate opening to exclude.
3, Muffle furnace controller should be limited to use in the ambient temperature range of 0-40℃.
4. According to technical requirements, regularly check whether the wiring of electric furnace and controller is in good condition. The temperature measuring thermocouple connected to the controller may cause interference to the controller, such as hop word of controller display value and increase of measurement error. The higher the furnace temperature, the more obvious this phenomenon is. Therefore, make sure that the metal protection tube (housing) of the thermocouple is well grounded, and if necessary, use a three-wire output thermocouple. In a word, all effective measures should be taken to reduce dry disturbance.
5, thermocouple do not pull out suddenly at high temperature, to prevent the coat burst.
6, Muffle furnace often keep the furnace clean, timely removal of oxides in the furnace and other things.
7, in the process of use, in the furnace with alkaline material melting sample or burning sediment, should strictly control the operating conditions, it is best to lay a layer of refractory plate in advance at the bottom of the furnace, in order to prevent corrosion of the furnace chamber.
Notes for use of high temperature Muffle furnace:
High temperature of the muffle furnace use longer will need to master the correct method of use, operating the teacher know the high temperature furnace in change of connection assembly silicon carbon rod, only need to change the connection, and the changes after connection, should pay attention to when using high temperature muffle furnace slow eyelid heating power button, the heating current value shall not be beyond the additional value. The instrument should be placed in the position of dry, ventilated, non-corrosive gas small mixer, the task environment temperature is 10-50 ℃, the absolute temperature is not more than 85%. In order to ensure accurate measurement, the DC potential difference meter is used to correct the temperature meter of xmt temperature controller every year to prevent large errors. Check whether the local hot wire is loose and whether the contact of the AC contactor is good. The defects should be repaired in time.
For THE SILICON ROD TYPE FURNACE, IF THE SILICON ROD IS FOUND TO BE DAMAGED, A NEW SILICON ROD OF OPPOSITE SPECIFICATION AND SIMILAR RESISTANCE VALUE SHOULD BE REPLACED. When changing, remove the maintenance cover at both ends and the silicon carbide rod chuck first, and then take out the damaged silicon carbide rod. Because the silicon carbide rod is easy to break, care must be taken during the installation. The inner part of the exposed furnace shell at both ends should be equal, and the chuck must be tightened so that it is in good contact with the silicon carbide rod.
If the chuck has serious oxidation should be replaced. Cracks in the holes of the device at both ends of the silicon rod are blocked with asbestos rope. The temperature of the experimental furnace shall not exceed the maximum task temperature. The silicon carbide V mixer rod is allowed to work for 4 hours in succession at the lowest temperature. After the electric furnace has been used for a long time, if the heating power conditioning button is sent clockwise to the maximum position, the heating current still cannot go up. The extra value of the small interval labeling machine is far away, and the required heating power is not reached, which explains that the silicon carbon rod has been aged.
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