Vacuum Hole Plugging Machine for print circuit board

The VPM fills holes under vacuum environment, so it can prevent the tiny bubbles in the paste when filling the holes. It also can effectively reduce the air bubble produced.
Principle as shown in the figure below
Two chambers design. It can be connected and isolated between the big and small chambers.
To fill the hole in big vacuum chamber, to load and unload PCB on the small vacuum chamber.
 When load and unload PCB, we only need open the small vacuum chamber, at the same time, it is isolated between the two chambers. Which can improve the hole plugging efficiency.
The equipment can be used to selective hole plugging under vacuum. Plug hole aspect ratio: Through hole 30:1, Blind hole:5:1. It also can plug the back-drilling hole.  Advantages:
 5-6 seconds to out gassing for the small vacuum chamber, faster than the other brand equipment which is need 12S. With fast speed of sliding table movement and lifting. Under the same condition, the capacity is 15%-20% higher than the other brand equipment.
Unique method of the vacuum system design and control mode. Can save about 15%-20% of energy compare to the other equipment. 
The vacuum chambers made by special steel plate which are high cost and good vacuum tightness.
Adopt the high vacuum valve in the vacuum system to guarantee the high vacuum degree. While the other brand VPM use low vacuum pneumatic butterfly valve. The leakage rate is 1.0x10-2Pa.L/S.
Max screen table size is 640*780mm, bigger than other equipment 620*680mm
With a PCB fallen off detection function which can decrease the risk of damage to the dropped PCB.