Safety precautions for box furnace

Those safety considerations should be taken into account when maintaining the box furnace

It is mainly used for heat treatment such as normalizing, quenching and annealing of alloy steel products and various metal parts, or high temperature sintering of diamond cutting blades. Widely used in ceramics, metallurgy, electronics, glass, chemical industry, machinery, refractories, new material development, special materials, building materials and other fields of production and experiment.

According to the characteristics of box furnace, there are box resistance furnace, crucible furnace, muffle furnace. According to the nationality of domestic box furnace and imported box furnace. According to the heating elements are divided into: resistance wire muffle furnace, silicon-carbon bar box furnace, silicon-molybdenum bar box furnace; According to the rated temperature, it is generally divided into: 1100 degree box furnace, 1200 degree box furnace, 1400 degree box furnace, 1600 degree box furnace, 1700 degree box furnace, 1800 degree box furnace. According to the controller to distinguish the following several: pointer table, general digital display table, PID control table, program control table; According to heat preservation material to distinguish: ordinary firebrick and ceramic fiber two kinds. The box furnace is a periodic operation type, which is used for element analysis and determination in laboratories, industrial and mining enterprises and scientific research units, as well as for heating in quenching, annealing, tempering and other heat treatment of small steel parts. The high-temperature box furnace can also be used for sintering, dissolution, analysis and other high-temperature heating of metals and ceramics.

Note for box furnace maintenance

1. After the furnace is used or not used for a long time, it should be baked at 120℃ or so for 1 hour, and baked at 300℃ or so for 2 hours, so as not to cause furnace cracking. The furnace temperature must not exceed the rated temperature, so as not to damage the heating element and lining. It is forbidden to pour all kinds of liquid and dissolved metal directly into the furnace to keep the furnace clean.

2. In the use of cold furnace, because the furnace chamber is cold, a large amount of heat absorption, so low temperature section temperature rate is not easy too fast, the temperature of each temperature section temperature rate difference is not easy too big, set the temperature rate should fully consider the physical and chemical properties of sintered materials, so as to avoid the phenomenon of spraying, pollution of the furnace.

3. Regularly check whether the electrical connections of the temperature control system are in good contact, and pay special attention to whether the connection points of the heating elements are tight.

4. In the working process, if the control deviation cannot be eliminated, the temperature display value does not conform to the set value of the program or swings too much, check whether the setting of parameters "M5, P, t" is accurate.

5. Box furnace is applicable to the following working conditions:

(1) The ambient temperature is between -10 ~ 75℃.

(2) The relative humidity of the surrounding environment shall not exceed 85%.

(3) There is no conductive dust, explosive gas or corrosive gas that seriously damages the metal and insulation materials around the furnace.

(4) No obvious tilt, vibration or jolting.

Safe operation of box furnace

1. Clear the scrap iron in the furnace and sweep the bottom plate of the furnace to avoid short circuit damage caused by scrap iron falling on the resistance wire.

2. The workpiece of the box-type furnace shall not exceed the heavy load of zUI of the furnace bottom plate. It shall be handled when the power supply is disconnected.

3, Wang Yi check the thermocouple installation position. After the thermocouple is inserted into the furnace, it should be guaranteed not to collide with the workpiece.

4. Determine the reasonable process scope according to the drawing requirements of the workpiece. Temperature rise on time to ensure the operation, often check the instrument temperature and calibration, prevent misoperation.

5, in order to ensure the furnace temperature, can not casually open the box furnace door, check the furnace should be observed in the furnace door hole.

6. The coolant should be placed in a convenient location nearby to reduce the cooling after the workpiece is removed from the oven.

7, when out of the oven should be correct position, clamping firm, prevent hot workpiece harm human body.

8. After the overhaul of the box furnace, it is necessary to bake according to regulations, and check whether the furnace hall and the top insulation powder are filled, and whether the ground is fastened with the furnace shell.