The operation process of the relay control system of the optical coating machine
If the cooling water has been connected, the contact of the water pressure relay will be closed. When the front pressure of the diffusion pump reaches the set pressure value, the contact of the vacuum relay will be closed. According to the preset program, the diffusion pump will be started automatically. If there is a water cut or the front pressure of the diffusion pump exceeds the set pressure value, the diffusion pump will be automatically stopped by the action of the water pressure relay or vacuum relay, which will protect the diffusion pump oil (not be oxidized); At the same time, once the diffusion pump is started, the contactor contact of the control diffusion pump is interlocked with the mechanical vacuum pump control circuit, so that the mechanical vacuum pump will not be stopped due to operating errors during the operation of the diffusion pump. Therefore, the circuit is also protected Features.
There are two possibilities for why the vacuum coating machine is getting slower and slower.
1. Due to the long time coating inside the equipment, some dirt will deflate during heating. Therefore, this situation requires maintenance, that is, remove the internal shielding plate and remove the sandblasting or stripping film and clean it thoroughly.
2. Small leaks are not found, especially the sealing of various transmission parts. This situation is more difficult to check. If there is no leak detector, only part of it can be removed or replaced with blind plates to eliminate it. Some people use the needle to inject alcohol to observe the change of the vacuum gauge, but it is generally difficult to judge when the leakage is not large. As for the vacuum 1.9 that you said is actually not high, the leakage rate is based on the volume of your equipment. And the degree of vacuum drop per unit time is not calculated according to the vacuum value. For example, if your vacuum pump has a good pumping speed and a strong pumping capacity, it is possible to overcome the slight leakage and make the vacuum display a higher value.
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