Working principle of belt vacuum filter

  The belt vacuum filter mainly operates by a gear motor driving a large drive shaft through a chain and sprocket. At both ends of the large drive shaft, there are two large sprockets that drive two large chains. The large chains are connected by multiple scraper blades.

  There are sliding grooves on the inner wall of the oil tank, and the scraper blades pressing on the filter paper move in parallel, causing the filter paper to move. When the emulsified liquid level in the filter tank reaches a high level, the filtration system's centrifugal pump starts, drawing the emulsified liquid from the lower chamber of the filter tank, creating a vacuum in the lower part of the filter tank. Under the influence of its own weight and atmospheric pressure, the emulsified liquid moves from the upper dirty oil chamber through the middle filter paper into the lower vacuum chamber.

  The filtered emulsified liquid is pumped through pipes into the clean system's main oil tank, while the impurities filtered out are adsorbed on the filter paper. As the system operates, the impurities on the filter paper continuously increase, gradually increasing the resistance to the emulsified liquid, creating a pressure difference between the upper and lower chambers. When the pressure difference reaches the set value, the filter paper replacement process starts automatically.

  First, open the communication control valve on the connecting pipeline, allow the emulsified liquid stored in the top reservoir to enter the lower chamber of the filter tank, eliminate its vacuum, and pausing the filtration process.

  Next, the chain drive system starts, pushing the dirty filter paper out of the filter tank and pulling new filter paper into the filter tank.

  Meanwhile, the waste paper exiting the filter tank is rolled onto a spool, driven by a pneumatic motor. The length of the filter paper replacement can be preset. As the number of filter paper replacements increases, the diameter of the waste paper roll gradually increases. When it reaches the set limit, an alarm signal is triggered, reminding the operator to cut the waste paper, remove the roll, and reattach the waste paper that came from the filter tank to the spool for the next replacement cycle. Once a roll of filter paper is used up, the operator Replaces it with a new roll.