Medium -sized chain trigger

The utility model discloses a medium -sized chain trigger, including afterbody adjustment assembly, tail sprocket assembly, H type frame, middle H type frame, light rail, head sprocket assembly, major axis riding wheel assembly, cropped ear link joint, minor axis riding wheel assembly, long ear link joint, bottom light rail supporting seat, bearing frame backup pad, bearing frame mounting panel and chassis end to end, afterbody adjustment assembly is located tail sprocket assembly one side, the light rail is located between tail sprocket assembly and the head sprocket assembly, the light rail carries on in H type frame and middle H type put up end to end, H type chord position puts up both ends in middle H type end to end, major axis riding wheel assembly and cropped ear link joint are located the first half that the H type put up and middle H type puts up end to end, still be equipped with leak protection material belt feeder between chassis and the light rail, this medium -sized chain trigger can collect th