Automatic expansion and shrink type edge material winding drum

The invention discloses an automatic expansion and shrink type edge material winding drum. The automatic expansion and shrink type edge material winding drum comprises a first bearing support, a second bearing support, a hydraulic cylinder support, a first support bearing and a second support bearing, a shaft sleeve is respectively mounted in the first support bearing and the second support bearing, the shaft sleeve is connected with a chain wheel, a main shaft is connected in the shaft sleeve, one end of the main shaft is connected with a bend plate mounting seat, which is jointed with a plurality of bend plates, the shaft sleeve is connected with a grade disc mounting seat, the grade disc mounting seat is fixedly connected with a grade disc, a support rod is jointed between each bend plate and the grade disc, the other end of the main shaft is connected with a moving and rotating bearing seat and a moving and rotating bearing, a hydraulic cylinder is mounted on the hydraulic cylinder support, the piston rod of the hydraulic cylinder is mounted in the moving and rotating bearing. The automatic expansion and shrink type edge material winding drum is simple in structure, reasonable in design and small in the floor space and has the automatic expansion and shrink function, the material is unloaded and blocked conveniently, the time consumption is short for the operation process, the frequent maintenance and repair are not needed, the practicability is strong, the use effect is good and is convenient for popularization to use.