Abstract: A polishing device for a metal conveyor belt suitable for an automatic conveyor line includes a holding pillar with one end fixedly provided with a bearing head, a supporting carriage fixedly connected to the bearing head, assembly supporting frames, an assembly sliding column, a polishing supporting shaft and locking mechanism. A bottom end of the holding pillar is provided with a barrier protection assembly. Both ends of the supporting carriage are respectively provided with a reciprocating assembly and two assembly supporting frames. Opposite side surfaces of the two assembly supporting frames are respectively rotatably connected with a rotating seats. Both ends of the assembly sliding column are respectively fixedly installed and in transmission connection with two rotating seats. Both ends of the assembly sliding column are respectively in transmission connection with the reciprocating assembly. The polishing supporting shaft is in transmission connection with the assembly sliding column.

Abstract: A use of a CD200 extracellular domain protein or a fusion protein formed from a CD200 extracellular domain protein and an Fc fragment in preparing a drug for treating psoriasis is disclosed.