Abstract: Drum type dust collector is widely used in coal mine dust workplaces. It has the advantages of large filtration area per unit volume, high dust removal efficiency and low running resistance. In the cartridge dust collector, the filter cartridge is the core part for dust filtering, and its dust filtering and dedusting effect is the key factor affecting the performance of the dust collector. In this design, based on the empirical formula obtained from the experimental research of the spray pipe at home and abroad, the near average flow design of each orifice is carried out for the spray pipe of the filter cartridge ash removal system, so as to achieve the equal ash removal air volume for each filter cartridge, eliminate the different ash removal effects of each filter cartridge caused by the unequal air volume at each nozzle, and prevent the filter cartridge with relatively weak ash removal strength from greatly reducing its dust filtering function due to the dust accumulation and paste.