Automatic door opening and closing actuator

An automatic door opening and closing actuator, comprising a mounting housing and a push rod, one end of the push rod extending out of a channel arranged in the mounting housing, and the other end of the push rod being arranged to slide reciprocally inside the mounting housing, wherein the automatic door opening and closing actuator further comprises a sealing tube sleeved outside the push rod, one end of the sealing tube is provided with a wrapping ring of an elastic material that wraps the push rod, and the other end of the sealing tube is hermetically fixed to an inner wall or one end of the channel;

• and
• an inner wall of the wrapping ring is provided with a circumferentially arranged first protruding ring, two sides of the first protruding ring on the inner wall of the wrapping ring are each provided with at least one second protruding ring arranged at intervals, and an oil groove for storing lubricating grease is formed between any adjacent first protruding ring and second protruding ring or between any two adjacent second protruding rings, wherein
• both the first protruding ring and the second protruding rings are in interference fit with the push rod, and an annular center line of the first protruding ring is collinear with a center line of the push rod at a contact position between the first protruding ring and the push rod.