Reverse material prevention device suitable for small-segment-difference parts

The utility model relates to the field of part material returning prevention, in particular to a material returning prevention device suitable for small-segment-difference parts, which comprises a multi-position fixed cylinder, the rear side wall of the multi-position fixed cylinder is fixedly connected with a cylinder connecting plate, and the bottom end of the multi-position fixed cylinder is fixedly provided with a fine tuning block. A clamping jaw fixing block is fixedly installed on the side wall of the fine adjustment block, the lower end of the clamping jaw fixing block is fixedly connected with a clamping jaw, and a pipe connection type one-way throttle valve is fixedly installed on the front side wall of the multi-position fixing air cylinder. If the electromagnetic induction switch on the cylinder does not obtain the signal, the part is placed reversely, and the system gives an alarm and transfers to manual reversing treatment. The device is simple in structure and convenient to machine and maintain