Drying equipment, also known as dryers and dryers. An apparatus for carrying out a drying operation by vaporizing the moisture (usually moisture or other volatile liquid component) in the material by heating to obtain a solid material having a predetermined moisture content. The purpose of drying is for the use of materials or for further processing needs. Such as wood in the production of wood, wood drying can prevent the deformation of the product, ceramic billet in the drying of two drying equipment before drying can prevent the finished product cracking. In addition the dried material is also easy to transport and storage, such as the harvest of grain to a certain moisture content below, to prevent mildew. As the natural drying can not meet the needs of the development of production, a variety of mechanized dryer more and more widely used.