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Precautions for the use of high temperature vacuum atmosphere furnace

Precautions for the use of high-temperature vacuum atmosphere furnace :
  1. The workpiece-the workpiece car must be cleaned and dried before entering the furnace to prevent moisture and dirt from entering the furnace.
  2. When the transmission parts are found to be stuck, inaccurate in the limit, and control failure, they should be eliminated immediately, and do not force the operation to avoid damage to the parts.
  3. The high-temperature vacuum atmosphere furnace cannot be overloaded. The maximum operating temperature of the high-temperature vacuum atmosphere furnace refers to the allowable surface temperature of the element in the vacuum, not the temperature of the heating material or the temperature around the heating element. Note that the temperature of the vacuum heating element itself is 100°C higher than the temperature of the surrounding medium or the heated temperature.

high temperature vacuum atmosphere furnace

  4. When measuring the temperature uniformity of a high-temperature vacuum atmosphere furnace, attention should be paid to the positioning of the temperature measuring contact and the distance from the heating element. In the high-temperature vacuum atmosphere furnace, the furnace is often cleaned with brushes, brooms or compressed air, vacuum cleaners, etc. (every day or before each shift), to prevent impurities such as oxide scale in the furnace from falling on the heating elements, short-circuiting, or burning out in serious cases Molybdenum heating rod. The bottom plate, molybdenum heating rod, furnace insulation layer and other heat-resistant steel components should be cleaned every time they are used. Knocking is strictly prohibited, and their oxide scale can be removed carefully. If the iron oxide scale and other impurities are not removed in time, the molten area will ignite with the insulation layer, causing the molybdenum wire to melt.
  5. Avoid the heating element and the product from reacting, especially if copper, aluminum, zinc, tin, lead, etc. come into contact with the vacuum heating element, whether it is fine powder, molten liquid or steam, etc., to prevent corrosion on the surface of the electric heating element from forming "hemp". "Pit", the cross-section becomes smaller, causing overheating and burning.
  6. After the high-temperature vacuum atmosphere furnace heats up, the vacuum system cannot be suddenly destroyed, let alone open the door of the high-temperature vacuum atmosphere furnace. Note that the vacuum gauge switch should be turned off before filling the atmosphere to prevent the vacuum gauge from aging. When the temperature is higher than 400℃, it must not be cooled rapidly. For the vacuum heating element, it is easy to cause oxidation when the temperature is high, the vacuum degree is not good, and the cold and heat changes are large. For molybdenum heating furnace, during normal use and maintenance, it should be cooled to below 200 ℃ before stopping the protective nitrogen. The furnace door can only be opened below 80°C.
  7. The cooling system is a high-temperature vacuum atmosphere furnaceImportant part. The cooling water circuit should be kept unobstructed, otherwise the water temperature will increase and cause the shutdown. This is a problem that is often overlooked when working with high-temperature vacuum atmosphere furnaces. When unattended, it may cause major damage to the high-temperature vacuum atmosphere furnace. The purpose of treating the cooling water with the aid of biological decomposition and chemical methods is to keep the minerals in suspension and reduce the accumulation of sediment in the rubber tube, serpentine tube and water jacket, so that the water can flow smoothly. This is generally done using an automatic device, which can monitor the conductivity of the water, automatically replenish chemical agents, flush the waterway, and add fresh water. In conjunction with the attached steam filter system, this method can also ensure the pH control of the water and prevent the deposition of excess minerals in the cooling water system. After the system is stable, a water quality test should be conducted once a month to prevent over-treatment or under-treatment. The test samples of the high temperature vacuum atmosphere furnace shell and heat exchanger materials should also be placed in the water system, and a weight loss test should be done every year to check the effect of the treatment. Special attention must be paid to the serpentine tube cooler of the diffusion pump. It should be checked frequently. If it is blocked, the diffusion pump will overheat and lose its function, and will further cause the diffusion pump heater to burn out, causing expensive and time-consuming repairs. When the serpentine cooling water pipe is blocked, disconnect the water path from the water source, drain the water and blow it through with compressed air or flush it with dilute acetic acid solution.

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