Ore and coke tank feeding system and technology capable of realizing classification below tank

The invention discloses an ore and coke tank feeding system and technology capable of realizing classification below tanks. The system comprises ore and coke tank bodies, a main material tape machine and a return material tape machine, wherein three-stage screening equipment is arranged below the ore and coke tank bodies; two weighing hoppers corresponding to two higher particle size classes are arranged below each piece of three-stage screening equipment and connected with outlets of the two higher particle size classes through feeding chutes respectively; the outlets of the two weighing hoppers are provided with mixing feeding machines for feeding materials to the main material tape machine according to the quantity; outlets with the lowest particle size class of the three-stage screening equipment are connected to the return material tape machine through another chutes to recover coke nuts or ore nuts. With the adoption of the system and the technology, crude fuel is divided into three classes through one-time screening, two materials at required particle size classes enter different weighing hoppers simultaneously, the arrangement is concise, material transfer links below the tanks are reduced, the material crushing rate is decreased, the engineering investment is reduced, the production cost is saved, accurate layered mixing is realized, and raw materials are fully mixed. Meanwhile, classified charging of the crude fuel for smelting is reliably guaranteed.