Maintenance method of box resistance furnace
Box-type resistance furnaces and crucible resistance furnaces are used for elemental analysis in various industrial and mining enterprises, colleges and universities, scientific research units, heating of small steel parts during quenching, annealing, and tempering. The maintenance of the box-type resistance furnace is of great significance for future normal use, and it also plays a vital role in the service life of the box-type resistance furnace. So, what is the maintenance method of box resistance furnace?
Box resistance furnace
Box type furnace maintenance method
1. Regular dust removal;
2. Regularly check whether each terminal is firm;
3. Check whether the related switch action is normal;
4. Check the heating condition of the terminal;
5. Check if there is water in the periphery;
6. Check the sealing condition of the box (especially in the dusty environment);
Maintenance method for internal parts of box resistance furnace
1. The insulation layer of Zhipu Furnace Box Type Resistance Furnace uses lightweight alumina fiber cotton. The insulation effect is better and the maintenance is very convenient. The furnace door fire block and furnace mouth high temperature cotton of the box-type resistance furnace are important parts of the electric furnace, but they are wearing parts, which easily affect the insulation of the resistance furnace and the uniformity of the furnace temperature. Therefore, it should be light in the process of use. Handle it lightly with the perforated side facing out for easy access. When taking it out, use two 8mm round rods to gently lift it up and pull it out. When using it, keep the integrity of the fire block and the high temperature cotton at the mouth of the furnace, without cracking or falling corners.
2. The burning plate used in the box resistance furnace must meet the relevant technical requirements. For example, if the fire resistance is low, it will be easily bonded to the furnace at high temperatures, which will damage the furnace. Therefore, the box resistance furnace The fire resistance of the burner board must meet the technical requirements.
3. The temperature control system of the box-type resistance furnace should be checked frequently, and the fuses and connection screws should be conventionally fastened to keep them in good contact. Temperature control instruments and thermocouples are good to go to a professional unit every six months to verify the accuracy of the temperature. The operating temperature of the box resistance furnace is ** well maintained at ** 50 degrees below the high temperature. The depth of the thermocouple inserted into the furnace is 15 mm. This depth will directly affect the accuracy of the temperature measurement. Therefore, it must be used during use. pay attention.
4. When the box type resistance furnace thermocouple is installed, just insert it into the furnace, calibrate the position according to the instructions, connect the compensation wire and the thermocouple, the red wire is connected to "+", the green wire is connected to "-", the thermocouple and The gap between the furnace lining holes should be filled with sealed fiber cotton to keep the thermocouple tightly sealed.
5. The fan of box resistance furnace is mainly used to cool the control module, control instruments and related electrical accessories, and when the temperature of the resistance furnace is increased, the cooling speed of the box resistance furnace is increased. The fan is a vulnerable type of box resistance furnace. In general, a new fan will be replaced after one to two years of use.
6. After the silicon carbon rod is found damaged in the box resistance furnace, the new silicon carbon rod with the opposite specification and similar resistance value should be replaced. When changing, first remove the two ends of the maintenance cover and the silicon carbon rod chuck, and then take out the damaged silicon carbon rod. Because the silicon carbon rod is easy to break, be careful when installing the device. Tighten to make good contact with the silicon carbon rod.
7. If the chuck is severely oxidized, it should be replaced with a new one. The gaps at the device holes at the ends of the silicon carbon rod are blocked with asbestos rope. The furnace temperature must not exceed ** high task temperature of 1350 ° C. Silicon carbon V-type mixer rods allow 4 hours of continuous operation at low temperatures. After long-term use of the box-type resistance furnace, if you find that the heating power adjustment knob is adjusted clockwise to the maximum position, the heating current still cannot be reached, and the required heating power cannot be reached. Generally, the silicon carbon rod has aged.
Box resistance furnace
Box-type resistance furnace daily maintenance method
1. When the box-type resistance furnace is used for the first time, the oven must be implemented. The oven should be at room temperature for four hours at 200 ° C. 200 ° C to 600 ° C for four hours. In use, the furnace temperature must not exceed the rated temperature, so as to avoid incineration and destruction of electric heating elements. It is strictly forbidden to inject various liquids and easily soluble metals into the furnace. The resistance furnace ** is preferably below ** high temperature below 50 ℃ for office work. At this time, the furnace wire has a longer life span.
2. The muffle furnace and the restrainer must work in a place where the relative humidity is not more than 100%, and there is no conductive dust, explosive gas or corrosive gas. When metal materials with grease or something need to be heated, a large amount of volatile gas will affect and corrode the appearance of the electric heating element, destroy it and reduce the life span. Because of this, it should be prevented and sealed as soon as possible when it is heated.
3. Muffle furnace restrainer should be limited to use in the background temperature of 0-40 ℃.
4. According to the technical requirements, regularly check whether the strings of the electric furnace and the choke are satisfactory, and point out whether the pointer of the meter is stuck and stays still when it moves, and use a potentiometer to correct the meter due to permanent magnets, demagnetization, and expansion. The fatigue caused by wire and shrapnel and the damage caused by balance damage increase the situation.
5. Don't pull out the thermocouple suddenly at high temperature to prevent the jacket from bursting.
6, often keep the furnace clean, as soon as possible to clean up the oxygen in the furnace to remove any items.
Annual maintenance method of box resistance furnace
1. In order to ensure accurate measurement, a DC potentiometer should be used to calibrate the temperature meter of the temperature controller to avoid causing large errors.
2. The instrument should be placed in a dry and ventilated place without corrosive gas. The working environment temperature is 10-50 ℃, and the relative temperature is not more than 85%.
3. The user can abide by the above operating procedures. During normal use, if the product does not work properly due to the quality of the product, it will be repaired free of charge within one year, and the spare parts will be replaced until the product is replaced. However, the user shall not disassemble and assemble without the quality principle of the manufacturer, otherwise the user shall be responsible for various maintenance costs.
4. If the silicon carbon rod furnace is found to be damaged, replace it with a new silicon carbon rod of the same specification and similar resistance value. When replacing, first remove the protective cover at both ends and the silicon carbide rod chuck, and then take out the damaged silicon carbon rod. Because the silicon carbon rod is easily broken, care must be taken during installation. The exposed parts of the furnace shell at both ends should be equal. Tighten to make good contact with the silicon carbon rod. Replace the chuck if it is severely oxidized. The gaps at the mounting holes at both ends of the silicon carbon rod should be blocked with asbestos rope.
5. Regularly check each part for looseness every year, and check whether the contacts of the AC contactor are good. If there is any fault, it should be repaired in time.
Box resistance furnace
Maintenance method of box-type resistance furnace before shutdown after a period of time
1. When the box furnace is used for a long time, it must be used again. The oven time should be four hours at 200 ° C. 200 ° C to 600 ° C for four hours. When in use, the furnace temperature must not exceed the rated temperature, so as not to burn the heating elements. It is forbidden to pour various liquids and easily soluble metals into the furnace. The electric furnace works below 50 ° C, and the furnace wire has a longer life.
2. The box furnace and controller must work in a place where the relative temperature does not exceed 85%, and there is no conductive dust, explosive gas or corrosive gas. When metal materials such as grease need to be heated, a large amount of volatile gas will affect and corrode the surface of the electric heating element, destroy it and shorten the life. Therefore, when heating, it should be prevented and sealed in time or properly opened to eliminate it.
3 box furnace controller should be limited to use within the range of ambient temperature -10-75 ℃
4 According to the technical requirements, regularly check the wiring of the electric furnace and the controller for good connections, and check whether the pointer is stuck or stuck when the pointer moves, and use a potentiometer to check the meter for magnetic steel, demagnetization, wire, and spring Increased error caused by fatigue, balance failure, etc.
5 Do not pull out the thermocouple suddenly at high temperature to prevent the jacket from bursting. Always keep the furnace clean and remove the oxides and other things in the furnace in time.