Device for switching vehicle body swinging cross welding clamp

The invention relates to a switching device of automobile bodywork mixing line welding fixture, which comprises a base, a slide rail, a location pin base, a connecting mechanism connected with the location pin base, and a promoting cylinder connected with a first fixture stop block and the connection mechanism; the switching device is characterized in that a unit connection base plate is connected with the location pin base vertically; a location pin connection block is fixedly connected on one side of the unit connection base plate; a location pin is fixedly connected on the location pin connection block and is vertical to the location pin base; a first positioning and a second positioning datum planes are fixedly connected on the upper part of the unit connection base plate, and are vertical to the location pin base; a proximity switch is arranged on the upper end of a support block, and is corresponding to/contacted with a displacement block arranged on the other side of the unit connection base plate. The