Opening conceal frame keel

The utility model discloses an opening conceal frame keel has solved the insecure problem of sheet material joint that can open dark fossil fragments deformation among the prior art and arouse, and its technical scheme main points are opening conceal frame keel, include with the main joist be connected articulate the portion and the supporting part, articulate the portion including articulate horizontal limit and with supporting part fixed connection articulates the riser, the supporting part is including the carrying bottom plate who bears the riser with be used for the joint ceiling, the riser and with it is connected through articulating the bottom plate to bear the riser, it is parallel to each other to articulate horizontal limit and carrying bottom plate, articulate the riser with bear the riser with it sets up perpendicularly to articulate horizontal limit, articulate the portion with the integrative rolling shaping of supporting part has reached integrated into one piece, has connected reliable techno