Large-caliber, hoop-free and well-sealed plastic barrel

A hoop-free plastic barrel, comprising:

• a barrel body with a rim portion;
• and
• a cover configured for sealing the rim portion;
• wherein a side edge of the rim portion of the barrel body is provided with a sealing ring;
• an outer peripheral surface of the sealing ring is a first sealing surface;
• an outer side of the barrel body is provided with an annular clamp ring;
• the annular clamp ring is arranged below the sealing ring;
• the cover is provided with a sealing groove configured for fitting the rim portion;
• the sealing groove comprises an inner side wall and an outer side wall;
• wherein the inner side wall of the sealing groove is close to a center of the barrel body, and the outer side wall of the sealing groove is away from the center of the barrel body;
• pan outer side surface of the inner side wall of the sealing groove tightly fit an inner wall of the rim portion;
• an inner side surface of the outer side wall of the sealing groove is provided with a second sealing surface in a seal fit with the first sealing surface;
• an outer peripheral surface of the cover is provided with a hook strip corresponding to the annular clamp ring;
• and an inner side wall of the hook strip is provided with a flange configured to be clamped with the annular clamp ring.