The utility model comprises an airdrum, a setting scale for air inflow, a positive negative pressure gauge, a respiration valve and a face mask;
本实用新型有一个气鼓，一个进气量设定标尺，一个正负压力表，一个呼吸活瓣，一个面罩；
2
Air recoil and pnermatic auxiliary scraper: this technology effectively reduces the solids remained in the drum and effective resume the performance of the filter cloths.
气体反冲及气体辅助刮刀装置：这种新技术的应用，可以使残余滤饼降低最少，以便滤布再生。
3
Dual circuit air brake, front and rear drum brake, energy storage spring parking system.