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4common problem

Like ordinary equipment, the vacuum quenching furnace will have many failures during use, especially in the case of our company's harsh environment and uninterrupted work, the failure rate of the equipment is relatively high. Because it is a non-standard equipment, there is no maintenance team with professional skills and qualifications for this type of equipment at the company's location. If you blindly rely on equipment manufacturers to repair or transform, the production pressure and economic pressure will be relatively high, so it is necessary to study and research this type of equipment to find better solutions to its common failures. And listed several types of common failure phenomena in our use process to analyze, and put forward the technical solutions to solve, also hope to help the relevant maintenance personnel.

Possible reasons and solutions for failing to reach the working vacuum:

The failure of vacuum quenching furnace to reach the required working vacuum is one of the more common fault phenomena, and it is also a relatively difficult fault to solve. It is relatively harmful to production and equipment, and it may even cause heating. Serious consequences of room damage. The key to vacuum leakage fault maintenance is to see whether the fault point (leak point) can be accurately determined. There may be many reasons why the vacuum cannot be pumped up. Maybe the vacuum unit has insufficient pumping capacity, or the leak rate is too high, or both. At this time, we must find a way to investigate: pump the vacuum chamber to After a certain vacuum state, close the vacuum valve. If the vacuum count rises very quickly, in most cases, the vacuum chamber leaks. At this time, the leak should be detected first and the leak should be corrected. If the vacuum count value rises slowly, it may be that the vacuum unit has insufficient pumping capacity. At this time, focus on finding the leaks of the vacuum pump and valves, or the vacuum pump is contaminated or oxidized, or the foreline pipeline is not sealed. Well, the pump is insufficient, or the pump is emulsified, the shaft seal is leaking, etc. At this time, it is necessary to change the vacuum pump or directly change the vacuum pump.

If it is found that the vacuum of the equipment drops rapidly in a short time, it is usually caused by the aging, scratches, and oxide scales of the dynamic seals such as the furnace door, the vacuum valve, and the intermediate partition hotspot. Clean the history, replace the seals, and manually switch the valve for maintenance. If there is no problem in these places, check the location of the interface between the vacuum chamber and the outside world, such as connecting flanges, water-cooled electrodes, pipes and vacuum tubes, etc. Sometimes the acetone leak detection method can be used to observe the changes in vacuum and carefully find leaks. If you can't find any leaks, you must disassemble and re-install all the suspected air leaks, or process a solid flange to block the test.

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