Abstract: After the ores mined underground in Zhongguan Iron Mine ore broken into a certain block by the crushing station，they are lifted to the surface skip bin through the hoist，and then transported to the grinding bin through 6 conveyor belts. There are many conveyor faults in the transportation process， which affects the production efficiency. In order to reduce the maintenance frequency of the buffer roller in the feeding and transportation system，the buffer roller is replaced by a buffer bed to improve its impact re⁃ sistance. The buffer device is added at the bottom of the ore chute to replace the chute buffer lining plate， so as to improve the maintenance efficiency and reduce the impact force on the surface of the conveyor belt. The conveyor belt with higher impact resistance is replaced to improve the service life of the conveyor belt. Through a series of technical transformation and optimization adjustment，the transportation capacity of the feeding system exceeds the design capacity，the equipment start-up rate is increased by 20%. The service life of the conveyor belt is improved，and the transportation cost of the feeding system is reduced. At the same time，the material accumulation at the bottom of the conveyor belt is also effectively controlled， which reduces the work intensity of the workers. It can provide reference for mine optimization using con⁃ veyor belt to transport large materials.

Key words: conveyor, buffer roller, buffer device, ore chute