Airtightness detection device for oil duct oriface in crankshaft

The utility model relates to an airtightness detection device for an oil duct orifice in a crankshaft. The two ends of a straight oil orifice in the connecting rod of a crankshaft are respectively provided with a connecting rod straight oil orifice bulkhead and a connecting rod straight oil orifice plug-in rod. The connecting rod straight oil orifice bulkhead and the connecting rod straight oil orifice plug-in rod are threadedly matched, connected together and tensioned. The two ends of a straight oil orifice in the main journal of the crankshaft are respectively provided with a main journal straight oil orifice bulkhead and a main journal straight oil orifice ventilation plug-in rod. The main journal straight oil orifice bulkhead and the main journal straight oil orifice ventilation plug-in rod are threadedly matched, connected together and tensioned. The connecting rod straight oil orifice bulkhead, the connecting rod straight oil orifice plug-in rod, the main journal straight oil orifice bulkhead and the main journal straight oil orifice ventilation plug-in rod are respectively provided with a seal ring. The outer end of the main journal straight oil orifice ventilation plug-in rod is connected with a ventilation joint and a rubber hose. Through filling the compressed air into the main journal straight oil orifice ventilation plug-in rod, whether the air leakage occurs around an inclined oil orifice bulkhead or not can be detected. Therefore, the airtightness of an oil duct orifice in a crankshaft can be detected. The device is simple and reasonable in structure, reliable in sealing effect, convenient in detection operation, high in detection efficiency and low in cost.