Structure introduction
Ronghua SX2 series resistance furnace adopts thin steel plate with broken edges welded into a rectangular furnace shell. When opening the furnace door, lift the handle and pull People, less burning.
1000℃ type, the furnace is made of light high-alumina refractory material and is made into a square shape. There are heat dissipation grooves on the inner wall of the furnace, and a silicon carbide furnace bottom plate is added to the furnace bottom to make the heating element dissipate heat quickly, shorten the heating time, and prolong the service life. The furnace and the furnace shell are filled with thermal insulation materials (light clay or aluminum silicate fiber felt) for heat insulation. The heating elements are made into spirals and penetrate into the long slots of the furnace in sections. The temperature uses the small hole through which the thermocouple is inserted. In the structure of the SX2 series resistance furnace, the new material 1.2 light high aluminum is used instead of the original RLZ-48 high aluminum as the refractory material 0.4-06 light clay is used as the thermal insulation material. The volume density is smaller than the original, and the heat storage and thermal conductivity are reduced. As a result, the furnace heat storage is small, the heating time is shortened, the surface temperature rise is low, the power loss of the chamber furnace, and the power consumption are also greatly reduced, so the energy saving effect is more effective than the SX series.
The casing of the controller is welded by thin steel plate with broken edges, and the inside is equipped with a measuring device. The device for adjusting the temperature and controlling the power supply of the electric furnace can not only measure the temperature, but also automatically control the temperature within a given range.
Installation and use
1. After opening the package, check whether the electric furnace is complete and undamaged, and whether the supporting parts are complete. This type of electric furnace does not require special installation, and only needs to be placed flat on the flat ground or shelf in the room. The controller should avoid vibration, and it should not be placed too close to the electric furnace, so as to prevent overheating and make the internal components not work normally.
2. Insert the thermocouple into the furnace at 20∽25 mm, fill the gap between the hole and the thermocouple with asbestos rope, fill the gap between the thermocouple with asbestos rope, and connect the thermocouple to the controller with compensation wire (or use Insulated copper core wire) Pay attention to the positive and negative poles, do not reverse them.
3. An additional power switch should be installed at the lead-in place of the power line to control the total power supply. In order to ensure safe operation, the electric furnace and the controller are reliably grounded.
4. Remove the shockproof short circuit (or) wire on the back of the temperature indicator, and adjust the mechanical zero point. When using the compensation wire and the cold junction compensator, the mechanical zero point should be adjusted to the reference temperature point of the cold junction compensator. When the compensation wire is used, the mechanical zero point is adjusted to the zero position of the scale, but the indicated temperature is the temperature difference between the measuring point and the cold junction of the thermocouple.
5. After checking the wiring and confirming that it is correct, cover the controller shell, adjust the setting pointer of the temperature indicator to the required working temperature, then turn on the power and turn on the power switch. At this time, the green light will be on, and the relay will start to operate. When the electric furnace is energized, the ammeter will produce a reading, and the pointer of the temperature indicator will gradually rise. This phenomenon means that the electric furnace and the controller are working normally.
Maintenance and Precautions
1. When the electric furnace is used for the first time or is used again after long-term inactivity, it needs to be oven-baked. The oven time is four hours from room temperature to 200°C, and four hours from 200∽600°C. When using, the furnace temperature must not exceed the maximum temperature. So as not to burn the heating element. It is also forbidden to pour various liquids and easily soluble metals into the furnace. It is better for the electric furnace to work below the maximum temperature and below 50°C. At this time, the furnace wire has a longer life.
2. The electric furnace and controller need to work in a place where the relative temperature does not exceed 85%, and there is no conductive dust or explosive gas and corrosive gas. When metal materials such as oil need to be heated, there will be a large amount of volatile gas. Corrosion of the surface of the electric heating element will cause it to burn and shorten the life. Therefore, it should be prevented in time when heating, and the sealed container or appropriate hole should be removed in time.
3. The working environment temperature of the controller is limited to 5∽50°C. During transportation, the anti-shock short circuit (or wire) on the indicator board at the rear end of the indicator must be connected with wires to prevent damage to the instrument due to vibration.
4. According to the technical requirements, regularly check the electric furnace, whether the connection of each terminal of the controller is good, whether the pointer of the indicator is stuck or not, and use the potentiometer to check the fatigue of the instrument due to magnet steel, demagnetization, wire expansion, and shrapnel. , the error increase caused by the balance violation and so on.
5. Pull out or insert suddenly at high temperature to prevent the outer casing from bursting.
6. Always keep the furnace clean, and clean the furnace oxides and the like in time.
