Leak hunting device of automatic needle tube cutting machine

The utility model provides a leakage detection device of an automatic needle tube cutting machine. The device comprises a mounting bracket and a leakage detection device, the leakage detection deviceis fixed on the mounting bracket; the leak hunting device comprises a main body, an air inlet, an air outlet and two end sealing ports. The body is of a hollow tube structure and is connected to the outer circle of the needle tube in a sleeving mode. Wherein the air inlet and the air outlet are formed in the main body; the air inlet is externally connected with a pressure air source to provide airpressure in the main body; an ejector pin is arranged on the exhaust port; the sealing openings at the two ends are in sealing fit with the excircle of the needle tube; the ejector pin is arranged inthe main body to form a closed pressure space formed by the sealing openings at the two ends, the outer circle of the needle tube and the inner cavity of the main body, the ejector pin seals the exhaust port when being under h