This 5XZC-7.5DS Seed cleaner & grader uses a huge number of screw connections to reduce welding as much as possible, responding to the lack status of welders in the Chinese manufacturing industry. Two major advantages of screw connection: 1.The deformation of the steel plate caused by high temperature welding that can be avoided by screw connection also improve the processing accuracy. 2. Easy to maintain and improve the universality of components. Advantages on the client side: The equipment is equipped with two vertical air chambers (two air cleaning systems), which can more effectively remove light impurities and dust from the grain, widely used in sesame cleaning in Africa, and the main export region is also in Africa. From January to November 2017, China imported over 71 thousand tons of sesame seeds from 36 different countries. The top five countries were all African countries (Ethiopia, Sudan, Niger, Tanzania, and Togo).