Conveying device

1. A conveying device comprising:

a frame,

at least one transportation channel, and

at least one branch conveying mechanism,

the at least one transportation channel and the at least one branch conveying mechanism are driven by their respective driving units, and the at least one transportation channel is provided with a number of rows of regular rollers, or at least a conveyor belt, or a combination of regular rollers and a conveyor belt,

wherein the at least one branch conveying mechanism includes at least one group of irregular rollers, each group of the irregular rollers includes at least one row of the irregular rollers, and roller axles of the irregular rollers are provided on the frame via a roller axle support system, the cross-section of the irregular roller perpendicular to a rotation center line of the irregular roller is non-circular or eccentric, and the non-circular cross-section is substantially an ellipse, a regular polygon or another shape; a rotation center line of the eccentric cross-section does not pass through its center; when the irregular roller rotates, the highest point of a top of the roller is higher than an upper surface of an adjacent transportation channel during the rotation, and the lowest point of a top of the roller is lower than the upper surface of the adjacent transportation channel; when the irregular roller does not rotate, the top of the roller substantially stops at the lowest point of the top of the roller during rotation; and

wherein the at least one transportation channel and the at least one branch conveying mechanism are provided alternately, and the at least one transportation channel is not parallel to rotation center lines of the rollers of the at least one branch conveying mechanism.

2. The conveying device according to claim 1 , wherein in each one of the at least one transportation channel, the regular rollers provide a transportation direction which is substantially the same with that provided by the conveyor belt, the irregular rollers of the at least one branch conveying mechanism provides a transportation direction which is perpendicular to the transportation direction of the conveyor belt or the regular rollers of an adjacent transportation channel, the irregular rollers have rotation center lines that are perpendicular to rotation center lines of the regular rollers.

3. The conveying device according to claim 1 , wherein the conveying device further includes driving units, the irregular rollers, the regular rollers or the conveyor belt can be driven by their respective driving units, and one driving unit drives one or more rows of transportation rollers or one or more conveyor belts.

4. The conveying device according to claim 1 , wherein one branch conveying mechanism is arranged alternately with one transportation channel.

5. The conveying device according to claim 1 , wherein two branch conveying mechanisms are arranged alternately with one transportation channel.

6. The conveying device according to claim 1 , wherein in each one of the at least one transportation channel, a plurality of conveyor belts are parallel to each other, and the highest point of rotation of each regular roller and the upper surface of each conveyor belt are in the same plane.