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Introduction of muffle furnace and precautions for use

日期:2022-12-09 00:16
浏览次数:111
摘要:Classification of muffle furnaces Muffle furnaces are divided into domestic muffle furnaces and imported muffle furnaces according to nationality. According to the heating elements, there are: electric furnace wire muffle furnace, silicon carbon rod muffle furnace, silicon molybdenum rod muffle furnace; according to the rated temperature, it is generally divided into: 900 degree series muffle furnace, 1000 degree muffle furnace, 1200 degree muffle furnace Muffle furnace, 1300 degree muffle
Classification of muffle furnaces
 
Muffle furnaces are divided into domestic muffle furnaces and imported muffle furnaces according to nationality. According to the heating elements, there are: electric furnace wire muffle furnace, silicon carbon rod muffle furnace, silicon molybdenum rod muffle furnace; according to the rated temperature, it is generally divided into: 900 degree series muffle furnace, 1000 degree muffle furnace, 1200 degree muffle furnace Muffle furnace, 1300 degree muffle furnace, 1600 degree muffle furnace, 1700 degree muffle furnace. According to the controller, there are the following types: pointer table, ordinary digital display table, PID adjustment control table, program control table; according to the insulation material, there are two kinds: ordinary refractory brick and ceramic fiber. Therefore, users must write clearly in the contract when purchasing products, so as to avoid suppliers playing tricks.
 
The structure and parameters of the muffle furnace
 
The muffle furnace is divided into two parts: the furnace body and the intelligent controller. Some muffle furnaces are integrated with the furnace body and the controller, while others are separated.
 
The muffle furnace is mainly heated by electric furnace wire, which is divided into two-sided heating, three-sided heating, etc.; the ordinary brick structure muffle furnace has a slower heating rate, while the ceramic fiber structure is light in weight, and has a fast heating rate, which saves energy. At the same time, the service life has also been improved. There is also the controller. The slightly worse is the pointer type, which is read manually, and the better is intelligent control. The temperature control is more accurate than the pointer type temperature control, which reduces the error of visual reading and manual operation; Another is the excellent temperature sensor
 
The most basic parameters of the muffle furnace are the volume and the maximum temperature range:
 
The commonly used muffle furnaces have a volume of 4, 6, 10, 22, 30, and 45L. The common maximum temperatures of domestic muffle furnaces are 1000°C and 1200°C.
 
 
Scope of application
 
The muffle furnace is a periodic operation type, which is used for elemental analysis and determination in laboratories, industrial and mining enterprises, and scientific research units, and heating for general small steel parts such as quenching, annealing, and tempering. , analysis and other high temperature heating.
 
(1) Thermal processing, cement, building materials industries, thermal processing or processing of small workpieces.
 
(2) Pharmaceutical industry: used for drug testing, pretreatment of medical samples, etc.
 
(3) Analytical chemistry industry: as sample treatment in water quality analysis, environmental analysis and other fields. It can also be used for petroleum and its analysis.
 
(4) Coal quality analysis: used to measure moisture, ash content, volatile content, ash melting point analysis, ash composition analysis, and elemental analysis. It can also be used as a general-purpose ashing furnace.
 
Muffle furnace safety operation rules and cleaning
 
1. Safety operation rules of muffle furnace:
 
(1) Before starting the furnace, the tightness of the gas pipeline valve and the pressure on the gas pipeline should not be lower than the specified value.
 
(2) Test the working conditions of the push rod mechanism, pull rod mechanism and lifting mechanism in an empty furnace.
 
(3) Loosen the compression spring to the specified size range.
 
(4) Adjust the water level of the water seal, open the valve of the water seal to discharge the combustion pipe, and close the valve of the water seal.
 
(5) Close the furnace door at the feed end, open the furnace door at the discharge end to observe, and close the furnace door when the kerosene is sprayed out and the direction of the mist-like flow is normal.
 
(6) Light the burner of the feed chamber.
 
(7) Exhaust gas should be discharged through the valve with no water seal.
 
(8) In intermittent production, the furnace tank is first carburized.
 
(9) When the parts are placed, the distance between the parts and the parts is not less than 5 mm; the edge of the parts does not exceed the length of the bottom plate and the specified height.
 
(10) The feeding door and the discharging door should be opened and closed quickly, but the speed of the push-pull rod should be stable.
 
(11) The position of the parts in the pre-cooling chamber should be directly under the thermocouple.
 
(12) Only 24 chassis are allowed to be filled in the furnace. To continue feeding, you must first pull and then push.
 
(13) When the furnace is stopped, the temperature of each furnace area should be lowered to the same temperature, and then the natural cooling should be started.