Universal sealing plug for guide pipe

The utility model relates to a universal sealing plug for a guide pipe. The universal sealing plug comprises an elastic expansion sealing tube, a tie pin and a tightening nut. The elastic expansion sealing tube is a cylinder provided with a pinhole whereby two ends of the cylinder are communicated; two ends of the tie pin are provided with an oblate press-locking portion and a thread portion matching with the tightening nut. The tie pin removably penetrates the pinhole. The oblate press-locking portion is locked outside the pinhole and tightly pressed to the front end of the elastic expansion sealing tube. The thread portion extends out of the rear end of the elastic expansion sealing tube. The tightening nut is screwed to the thread portion and tightly pressed to the rear end of the elastic expansion sealing tube, so that the peripheral cylindrical face of the elastic expansion sealing tube expands out to seal the guide pipe. In this way, by adjusting pressures of front and rear ends of the elastic expansion sealing tube, the degree of the peripheral cylindrical face of the elastic expansion sealing tube, expanding out, is controlled to plug and seal guide pipes of different specifications; the universal sealing plug has the advantages that the plug is highly universal, capital is effectively saved, the structure is simple, the costs are low, the plug is flexible and convenient to use, and sealing is effective and guaranteed.