Sealing and blocking device for part hole

The invention provides a sealing and blocking device for a part hole. One end of a pull rod shell is in sealed sliding connection with the inner wall of a sealing gland; a locking external thread is also arranged on the circumference of the pull rod shell; the internal thread of the compression nut is meshed with the locking external thread; the pull rod sealing excircle is in sealing sliding connection with the inner wall of the pull rod shell; the other end of the pull rod extends out of the other end of the pull rod shell and is rotatably connected with the cam; the pressure spring is sleeved on the pull rod; the two hook pressing plates are rotatably connected with the pull rod; the pull rod extends out of the pull rod shell from the open end of the pull rod shell; the two ends of the elastic clamp are fixed to the backs of the two hook pressing plates respectively to drive the two hook pressing plates to be opened. The device has the advantages that the problems of low working efficiency, unsafety in lar