Roots blowers used for unloading are no different from ordinary roots blowers, such as Shaanxi Drum (a famous trademark in China), Zhanggu Zhanggu (a top 500 enterprise in China), Changfeng (a famous brand in Hubei), Pepsi Cola (a famous brand in Jiangsu), Gong Jin (a famous brand in Shandong), Shanggu (a famous brand in Shanghai), Backing, Sanfeng (a famous trademark in Hubei) and Jintongling (a famous brand in Hubei). Jiangsu Pepsi, Shandong Gong Jin, Zhang Gu, etc. Everything is fine. Among them, Gong Jin Roots blower has lower price and better quality than Pepsi-Cola blower. After several years of exploration, I am now familiar with air equipment, from price to brand, from principle to maintenance, from ignorance to proficiency.