Design Difficulties Of Automatic Feed Conveyor

The design of the transmission drum has always been a difficult point for automatic screw feeding machine manufacturers. The new type of drum, which is produced in combination with the characteristics of the industry, has not yet formed a general design series. In addition to the mature design of the typical drum shaft, there is no authoritative explanation for the stress and deformation of other drum parts, especially the drum body and spoke plate. The thickness of the drum body and spoke plate of the driving drum is determined according to the calculated shaft diameter of the bearing part.

In addition to the torque input from the shaft end, the driving drum is also affected by the force input from the shaft end to the conveyor belt. The tension ratio of the automatic feed conveyor can only be small, otherwise, it will slip. In practice, it refers to the case that all the enclosed arcs used for force transmission are not fully utilized, so there should be so-called utilization arcs of the enclosed angle. The remaining part of the shroud angle is the static arc, which represents a reserve of the circumferential force, used to overcome the resistance during startup or the resistance not estimated in advance, or used to prevent the conveyor belt from slipping when the friction coefficient is reduced.

Generally, the static arc will appear when the automatic screw feeding system conveyor runs stably. If the static arc disappears, there will be a maximum difference, and all the enclosure angles will transfer the force. This situation often occurs when the belt feed conveyor line is started. The tension of the conveyor belt is constant in the static arc, the running speed of the conveyor belt is consistent with the peripheral speed of the drum, and there is no sliding between the conveyor belt and the drum in the arc section. In order to better check the strength of the drum, if the drum is running at full load, there is no static arc in the tension of the conveyor belt on the drum, there is friction in the whole range of the enclosure angle, and the structural support of the drum has been aligned without load concentration.

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