Box and socket at bottom of cylinder -shaped socket with fixed knot constructs

The application discloses box and socket at bottom of cylinder -shaped socket with fixed knot constructs, this socket back box includes: an open -ended columniform casing has, around columniform shellopening edge circumference suddenly be equipped with be used for fixing socket at the bottom of the mounting of box and wall body position, around the columniform shell opening edge along radial inside or be equipped with to the evagination be used for connecting cylinder -shaped socket at the bottom of box and outside socket cover's a plurality of first stationary blade, be provided with the fixed orifices on the first stationary blade and set up at least one through wires hole that is used for introducing outside electric wire in the side of columniform casing and/or at the back. Circular concave hole only need be seted up through setting up socket back box into cylindrical structure during the installation to this application, has avoided the difficulty of seting up square shrinkage pool, moreover, the utility