First,Vacuum plating machine vacuum can not be pumped up: the same time, but the vacuum degree is low, then close the main valve, such as vacuum gauge pointer drops quickly, most of the situation is vacuum chamber leakage, should first detect the leakage point. For example, the vacuum gauge pointer drops very slowly, most of the situation is the vacuum unit pumping talent is indispensable, the key is to find the vacuum pump and valve to see where leakage occurs, or the oil pollution or oxidation of the loose pump; or the front pipeline seal is not good, lack of pump oil; or pump oil emulsification, shaft seal leakage, etc. Leakage - Leakage - Leakage of this part and leakage, larger leaks can be used by flame method, using the principle that air flow can make the flame violate, first vacuum, such as candles or lighters to gradually search in the vicinity of suspicious points, you will find that the flames deviate to the leak point, you can find the leak point. Find Leaks and Leaks: Use ionization tubes to react with certain gases in high vacuum to detect leaks, such as acetone or ethanol. Use medical syringes to spray acetone or ethanol to suspicious areas. When sprayed to the leak point, the ionometer's pointer will shake significantly. In this way, leak detection must have patience, must be more stable than the Ionometer indication - that is, the vacuum unit's pumping talent and leak rate balance, and then erupt. It's better to repeat it several times and admit the omission. Internal leakage mostly occurs in equipment with water-cooled jacket, and no doubts have been found on the leakage. However, there are the following phenomena: the pumping speed of mechanical pumps is significantly low, the indication value of vacuum gauge is low, the oil of mechanical pumps is quickly emulsified, and the iron-based parts in vacuum chambers are significantly rusted. With the above conditions, internal leakage can be determined.

   Second,The vacuum quenching furnace can not reach the degree of vacuum: it may be that the vacuum unit can not pump the air, or the leakage rate is high, or both. After the vacuum chamber is pumped to a certain vacuum condition, the vacuum valve is closed, if the vacuum The count value rises very quickly, and most of the conditions are vacuum chamber leaks. At this time, the leak point should be detected and the leak should be detected. If the vacuum count rises very slowly, it may be that the vacuum unit can not pump air. The key is to find the leakage of the vacuum pump and the valve, or the vacuum pump oil is contaminated, oxidized, or the front line seal is not good, the pump oil is missing, or the pump oil Emulsification, shaft seal oil leakage, etc., then replace the vacuum pump oil or directly replace the vacuum pump. If the vacuum degree of the equipment is sensitively reduced in a short time, it is usually formed by the aging, scratching and oxide scale falling of the dynamic seals such as the furnace door, the vacuum valve and the center septum, and can be replaced by a replacement seal. Switch valve overhaul. If there is no problem, check the position of the vacuum chamber and the external interface, such as the coupling flange, water-cooled electrode, pipe and vacuum tube. Sometimes you can use the acetone leak detection method to check the vacuum degree and carefully find the leak point. If you can't find any leaks, you should dismantle all the suspected leaks and install them from scratch. Maybe after processing the solid flanges, test them. h

 Third,The vacuum coating machine is slow to pump: from the rough end, if the pumping time is long, it is a problem with the spool pump, or there is a leak in the front pipe. If the rough pumping is no problem, it is a loose pump, generally Clean up the pump chamber and replace the pump oil.