The utility model relates to a special room heater in house, the on -line screen storage device comprises a base, be equipped with the arc wall on the base, the outside of arc wall is equipped with the fixed block, install adjusting screw on the fixed block, L shape limiting plate is installed to adjusting screw's tip, and the middle part of base is equipped with the fixed column, the upper end of fixed column is equipped with the screw rod, install set nut, fixed plate and stop nut on the screw rod in proper order, the tip of fixed plate is equipped with the rotary rod, the lower extreme of rotary rod is equipped with the riser, the leading wheel is installed in the outside of riser, the leading wheel is installed in the arc wall. The utility model discloses an adjusting screw that the setting has a L shape limiting plate helps restricting the home range of leading wheel, and help the spacing of fixed plate and fix a position through setting up set nut and stop nut, and simple structure, convenient operation, economical and practical.