Rail is used to connecting piece and pet

The utility model discloses a rail is used to connecting piece and pet. Problem for solving the prior art structural instability is invented. The utility model discloses a connecting piece is the U -shaped spread groove for a cross -section, be equipped with the fixed block in the middle part of the U -shaped spread groove fixed block middle part be equipped with the locating hole, the perpendicular U -shaped spread groove of locating hole bottom, the fixed block separate into two side arms with the U -shaped spread groove, be equipped with on the lateral wall of every side arm with stationary hump by fixture looks adaptation, wherein, form the contained angle between two side arms, the contained angle be the 0 -180 degree. After adopting above -mentioned structure, can make the pet cast become a whole through this connecting piece, can move and not take place the deformation lower of the collision of pet. And when not using, as long as remove the connecting piece, can convenient the folding of the same ability before as.