Sample introduction device

The utility model discloses a sample introduction device which comprises a tail blowing pipeline (01), a replacement gas pipeline (02) and a sample introduction pipeline (03), two ends of the sample introduction pipeline (03) are respectively connected with the tail blowing pipeline (01) and the replacement gas pipeline (02), and the tail blowing pipeline (01) is further connected with the replacement gas pipeline (02). The sampling device disclosed by the utility model consists of the simple gas circuit pipeline and the valve, and is simple in structure and convenient to implement; the connecting ports matched with the filling steel cylinder and the sampling steel cylinder are arranged, so that the analysis process is simplified; the pressure reducing valve is arranged, so that the pressure change in the pipeline is convenient to observe, and the sampling process is visually controlled; sampling is carried out in a whole closed environment, so that a series of sample pollution caused by contact with air is a