In addition, the sintered felt type of candle filter has good breathability, large pollution capacity, long service life, uniform mesh size, high strength, good processability, and convenient cleaning. This type of filter can not only be used on self-designed filters, but also as a substitute for imported similar filters to meet the needs of highly automated unmanned cabins and large lubrication equipment. At the same time, its appearance is exquisite, all using a metal mesh structure, with a long service life, lightweight and easy to replace.