Protection and connection device of sealing member used on metal track

The utility model discloses a protection and connection device of a sealing member used on a metal track. A sleeve is sleeved at the middle part of a pin shaft, and the internal diameter thereof is larger than the external diameter of the pin shaft; the sleeve is in clearance fit with the pin shaft; an inner chain element and an outer chain element are respectively sleeved outside two ends of thepin shaft and the sleeve; the a end of the outer chain element is sleeved at the upper end and the lower end of the pin shaft; the b end of the inner chain element is sleeved at the upper end and thelower end of the sleeve; the a end of the outer chain element is connected with the b end of the inner chain element; a gap is formed between the a end of the outer chain element and the b end of theinner chain element; the sealing member and a sealing member protection ring are placed in a cavity formed by the a end of the outer chain element, the b end of the inner chain element and the pin shaft; the circular sealing me