Device and system for collecting fragments in urea solution

The utility model provides a device and a system for collecting fragments in a urea solution, which can effectively remove the fragments and impurities in the urea solution, improve the collection efficiency, realize automatic cleaning and do not cause overlarge negative influence on the through-flow area. The trapping device comprises multiple stages of trapping grippers which are sequentially arranged in the axial direction; each stage of trapping gripper comprises a cylindrical connecting section and a trapping section which is arranged in an arc shape; one end of the trapping section is vertically arranged on the side wall of the tail end of the connecting section, and the other end is parallel to the axis of the connecting section and extends towards the tail end; the tail end of the trapping section of each stage of trapping gripper is connected with the connecting section of the next stage of trapping gripper in a one-to-one correspondence manner; the front end of the connecting section of the first-st