Fast sheet metal part positioning and locking mechanism

The utility model relates to the improvement on a positioning and locking device for detection pieces, in particular to a fast sheet metal part positioning and locking mechanism. The fast sheet metal part positioning and locking mechanism is characterized in that a positioning pin is arranged on the perpendicular bisector on the top of a cover, the side wall of the cover is fixedly provided with a cam through a rotating shaft, the cam and a grab handle are fixed, the lower portion of the cam is matched with a pressing pin of the cam in a contact mode, an ejecting spring is arranged at the bottom of the pressing pin of the cam in the cover, two pressing sheets are fixed to the top of the pressing pin of the cam through the rotating shaft, the two pressing sheets are provided with guiding shafts, an arc-shaped guiding groove is formed in the cover, the guiding shafts are in sliding fit in the arc-shaped guiding groove, the two sides of the positioning pin are provided with openings, and the heads of the two pressing sheets can extend outwards or shrink inwards in the openings. The fast sheet metal part positioning and locking mechanism has the advantages that by means of the locking mechanism, the positioning and locking requirements can be met at the same time, the locking state can be achieved as long as the spherical grab handle is pressed, loosening can be achieved by lifting the grab handle, and operation is fast and convenient in a time-saving mode.