Connected mode of LNG heavy truck gas system and pipeline

The utility model discloses a connected mode of LNG heavy truck gas system and pipeline, including the joint of pipeline and one end and gas headtotail, the pipeline with connect between also have after and cutting ferrule of cutting ferrule nut, preceding cutting ferrule, threaded in the inner chamber of cutting ferrule nut, step I and step II, the surface of preceding cutting ferrule has the conical surface I, and the internal surface has the step III and the conical surface II, the surface of back cutting ferrule has the step IV and the conical surface III, and the internal surface of joint has the conical surface IV, cutting ferrule nut, back cutting ferrule and preceding cutting ferrule overlap in proper order in the periphery of pipeline, and the inner chamber of cutting ferrule nut is all arranged in to preceding, back cutting ferrule, and the inner chamber of the preceding cutting ferrule of step III is arranged in to the back cutting ferrule one end that has a conical surface III, and the inner chamb