Box

A box, comprising:

• a box body, wherein a top end of the box body is open;
• a box cover, wherein the box cover is configured to cover an opening of the box body, a limiting rib is formed on a bottom end of the box cover near an outer edge, and the bottom end of the box cover is provided with an annular clamping groove outside the limiting rib;
• an elastic sealing ring which comprises:
• a top sealing ring, wherein the top sealing ring is crimped between an open end of the box body and a bottom end surface of the box cover, an inserting flange is integrally formed at a top end of the top sealing ring, and the inserting flange is inserted in and connected with the annular clamping groove;
• a middle sealing segment, wherein an outer wall of an opening of a top end of the middle sealing segment is integrally connected with a rim of the top sealing ring, and the middle sealing segment is fitted on an outer wall of the limiting rib;
• a bottom sealing ring, wherein a rim of the bottom sealing ring is integrally formed and connected with the outer wall of the opening of a bottom end of the middle sealing segment, and an outer edge of the bottom sealing ring is in compressing sealing contact with an inner wall of the box body,
• wherein a top end surface of the box cover is provided with a concave accommodating groove, a groove bottom of the accommodating groove is provided with an installing hole and a vacuuming vent hole, and the vacuuming vent hole is located on one side of the installing hole to form a cruciform hole;
• and
• an air hole lifting plug arranged on the installing hole, wherein the air hole lifting plug comprises:
• a lifting block, wherein the lifting block is arranged in the accommodating groove;
• a sealing cover, wherein a top end of the sealing cover is integrally formed and connected with a bottom end of the lifting block and a bottom end of the sealing cover and a groove bottom of the accommodating groove are in tight sealed contact for sealing the vacuuming vent hole;
• and
• a guide connecting block, wherein the guide connecting block is penetrated in the installing hole, a top end of the guide connecting block is integrally formed and connected with the bottom end of the sealing cover, a bottom end of the guide connecting block is integrally formed and connected with an anti-falling lug boss, and the anti-falling lug boss is located below the bottom end surface of the box cover.