First, the working principle of industrial oven
The temperature is controlled by the connection between the digital display instrument and the temperature sensor, and the hot air circulation air supply method is adopted. The hot air circulation system is divided into horizontal and vertical. After accurate calculation, the air source is driven by the operation of the air supply motor to drive the wind wheel through the electric heater, and the hot air is sent to the air duct and then enters the oven studio, and the used air is sucked into the air duct to become the air source for recycling and heating. Can effectively improve temperature uniformity. If the box door is opened and closed during use, the air supply circulation system can quickly restore the temperature value of the operating state.
Second, the structure of the industrial oven
The industrial oven is a double-layer structure inside and outside, the shell is an angle steel sheet, and the inner and outer double-layer shells are filled with fibrous material. The fibrous material used in industrial ovens is mostly aluminum silicate, which can play a role in thermal insulation and form a reliable thermal insulation layer. The industrial oven is equipped with a hot air circulation system and a temperature measurement and control system.
Three, industrial oven purchase items
custom-made
The production capacity determines the size and specifications, and meets the requirements Production demand, high production capacity, you can choose a crawler-type industrial oven. That is what we call drying production line, tunnel furnace, drying tunnel. Small ovens with low production capacity or experimental use can be customized.
Temperature
Choose 10 degrees higher than the actual temperature. According to the process requirements, calculate the actual required temperature difference to ensure the baking effect. Example: If the operating temperature is 150 degrees, 220 degrees, 360 degrees, and 440 degrees, do it according to the maximum design temperature of 500 degrees. 4 temperatures, if it is the same product. It is best to use thyristor for control. Different products have a slightly larger temperature difference when used at low temperature. The actual use effect of 150 degrees and 220 degrees is not as good as a low-temperature oven. Use a medium-temperature 500-degree oven, and the 150-degree baking temperature difference is 2-5 degrees higher than a low-temperature 250-degree oven. It also depends on the quality of the manufacturer’s equipment. The oven is divided into low temperature (0-250 degrees), medium temperature (250-600 degrees), and high temperature (600-1500 degrees) over 1200 degrees. The company recommends heating with carbon silicon rods, which can be selected according to the process requirements of the product.
Feeding
How to put the product in. The oven can be layered. Configuration tray, there are network disk, physical disk, punching disk. If you have more, you can use a material rack and a frame. But notice one problem. Is it convenient for the operator to operate. For example: an oven with a height of 1500 and a width of 1500 and a depth of 850mm. If you make a baking pan, put items. It is necessary to consider whether the operator can move it. Many factory operators are girls. Height is also more than 1500mm. If you want her to lift the 1500*850 baking pan. It’s a little difficult. Not to mention how heavy the product to be baked is.
Place the floor
If the oven is placed on the floor. Consider whether you can enter the door and enter the elevator.
In fact, it’s all technical problems to be satisfied. There is not much technical difficulty in the oven. Simple structure. It is easy to be counterfeited. It is recommended to sign a technical agreement for performance acceptance.
Four. Industrial Oven User Guide
The general electric vacuum drying oven adopts the method of first heating the wall of the vacuum chamber, The way the wall is radiantly heated towards the workpiece. In this way, the temperature sensor of the temperature control instrument can be arranged on the wall of the vacuum chamber. The sensor can accept convection, conduction, and radiation heat simultaneously. The glass rod thermometer in the vacuum chamber can only receive radiant heat, and because the blackness of the glass rod cannot reach 1, a considerable part of the radiant heat is refracted, so the temperature value reflected by the glass rod thermometer must be lower than the temperature reading of the instrument . Generally speaking, it is normal that the difference between the temperature reading of the instrument and the reading of the glass rod thermometer at 200 °C is within 30 °C. If the temperature sensor of the temperature control instrument is arranged in the vacuum chamber, the difference between the temperature value of the glass rod thermometer and the temperature reading of the instrument can be appropriately reduced, but cannot be eliminated, and the sealing reliability of the vacuum chamber adds a potentially unreliable link . If you don’t want to see this difference from the perspective of operation and practicality, you can use the unique display correction function of the temperature control instrument to solve it.
General electric heating (blast) drying ovens are equipped with temperature uniformity parameters: the upper limit of the working temperature multiplied by 3% for the natural convection drying box, and the upper limit of the working temperature multiplied by 2.5 for the forced convection drying box %. Only the electric heating vacuum drying oven does not set the temperature uniformity parameter, why is this? There is almost no possibility that the temperature of the working chamber can be uniformized by the movement of gas molecules in the vacuum drying box. Therefore, conceptually, we can no longer define the temperature uniformity specified by the usual electric heating (blast) drying oven to the vacuum drying oven. It is also meaningless to set this indicator in a vacuum state. The amount of thermal radiation is inversely proportional to the square of the distance. For the same object, the radiant heat received at a distance of 20cm from the heating wall is only 1/4 of that at a distance of 10cm from the heating wall. big difference. This phenomenon is the same as that when the sun is exposed to the sun in winter, the side exposed to the sun is very warm, and the side exposed to the sun is relatively cold. Because the structure of the vacuum drying oven is difficult to make the radiant heat of each point in the three-dimensional space of the studio uniform, and there is also a lack of authoritative evaluation methods, it may be that the temperature uniformity parameter is not set in the standard of the electric vacuum drying oven. s reason.
Industrial ovens are strictly prohibited from being used near inflammable and explosive materials such as water and paint. Otherwise there is a danger of explosion. At the same time, when the industrial oven is in use, the exhaust port must be connected to an external exhaust pipe. Most of the glues and the baked goods in the paint will produce some gases that are harmful to the human body in the high temperature environment. If they are discharged in time, they will endanger the health of people.
V. Safety operation procedures for industrial ovens
1. The equipment must be operated, repaired and maintained by special personnel;
2. Operation Personnel need to undergo safety training, and must hold the certificate to get the job certificate, and study the “Instruction Manual” of the electric oven, understand the basic structure and performance of the equipment, master the operation rules, and operate in strict accordance with the operation rules;
3. Operators must wear work clothes, sleeves should not be too long, and work caps;
4. The electric oven consumes a lot of electricity. Install appropriate fuses, use high-temperature-resistant insulating materials, and install leakage protectors;
5. Check the heating equipment and power cords daily. In case of exposure, etc., the electric plug and socket must be intact;
6. It is strictly forbidden to turn on the power switch with wet hands to prevent electric shock accidents;
7. Put the electric oven in a dry, Use on a flat place, and keep enough space around, keep a distance of at least 10-15cm from surrounding objects;
8. It is strictly forbidden to pull the power cord, and you need to pull out the plug before moving the electric oven , and move the oven with both hands;
9. It is strictly forbidden to place flammable objects in or around the electric oven, and keep away from curtains, curtains, curtain walls or similar items to prevent fire. When the oven is working, it is strictly forbidden to place any items on the top of the oven;
10. Please do not heat the closed container in the oven, otherwise there may be a danger of explosion;
11. When heating items, there should be enough space in the container to prevent the liquid from boiling and overflowing;
12. When the oven is in working state, only use the knob or handle to avoid burns;
13. Please use a soft damp cloth to clean the oven door, do not use sharp cleaning utensils to prevent damage to the door glass;
14. After the work is completed, turn off the oven power switch and the main power supply.
Six, industrial oven maintenance
Daily maintenance
1. Clean the surface and inner cavity Dust, keep the machine clean and hygienic.
2. Check whether the current of the ammeter is the same as normal.
3. In case of a sudden power failure, the heating switch should be turned off to prevent it from automatically starting when there is a call.
4. Check whether the fan is running normally and whether there is any abnormal sound. If there is, immediately shut down the machine and notify the maintenance worker to overhaul.
Monthly Maintenance
1. Check whether the vents are blocked and clean up the dust.
2. Check whether the fan is running normally and whether it is reversed.
3. The maintenance worker checks whether the current is normal.
4. Check whether the thermostat is accurate, if not, please adjust the static compensation or sensor correction value of the thermostat.
5. Check whether the heating tube is damaged and whether the circuit is aging.
6. Check whether the delay device is accurate and whether the error is allowed.
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