After the organic fertilizer is pelleted by the disc granulator, the water generated during the fermentation will still remain in the fertilizer particles, and the high temperature generated by the fertilizer during the fermentation process makes the quality of the fertilizer drop sharply. At this time, how to find a way to dispose of the water in the particles and how to reduce the temperature? Then we need to use the cooling machine in the production of organic fertilizer equipment. The cooling machine is the main configuration equipment of the production system on the fertilizer processing production line. It has simple structure, good stable performance and wants to turn reliable. The exhaust gas after the heat exchange can be introduced into the rotary kiln, thereby improving the thermal efficiency of the entire system. Alias drum fertilizer cooler, used for organic fertilizer and compound fertilizer production, cooling a certain temperature and particle size of the fertilizer, with the dryer used. It can greatly improve the cooling speed, reduce labor intensity and increase output. Further remove part of the water and reduce the grain temperature of the compound fertilizer. At the same time, it can be used for the cooling of other powder and granular materials. The cooling machine has the advantages of compact structure, high cooling efficiency, reliable performance and strong adaptability. The cooling machine equipment is specially designed for the production needs of granular organic fertilizer. In the production of granular organic fertilizer, the granular organic fertilizer from the pellet press must go through the cooling process to achieve the purpose of cooling and dehydration. In the existing equipment configuration, there are mainly two kinds of granular organic fertilizer cooling equipment, one is a vertical cooling machine, and the other is a countercurrent cooling machine. The principle is to use the high particle temperature from the particle press, generally 70 ~ 80 ° C, through the cooling process of the cooling machine, the material can remove about three percent of the water, in a more ideal situation, can meet the requirements of cooling and drying.