散料各微粒间存在着相互的内摩擦力和内压力，它们在链运机机槽内受到输送链运动带来的与运动同向的拉力作用，使散料间的内摩擦力、内压力增大，当内摩擦力大于物料与机槽壁的摩擦力后，物料在输送链的带动下向前移动，而增大了的内压力保证了料层之间的稳定状态，使其形成整体连续流动，当料层高与机槽宽的比值满足一定条件时，料流是稳定的，料速约等于链速。
There are mutual internal friction and internal pressure among the particles of bulk material. They are pulled by the movement of the conveyor chain in the slot of the chain conveyor in the same direction as the movement, which increases the internal friction and pressure between the particles. When the internal friction force is greater than the friction force between the particles and the wall of the machine slot, the material moves forward under the drive of the conveyor chain. The increased internal pressure ensures the stable state between the layers and makes them form a whole continuous flow. When the ratio of the height of the layer to the width of the slot meets certain conditions, the material flow is stable, and the material speed is approximately equal to the chain speed.