Mistake-proof mounting tool for multi-stage opening sealing ring and device comprising same

The invention discloses a mistake-proof mounting tool for a multi-stage opening sealing ring and a device comprising the same. The mistake-proofing mounting tool comprises a supporting table with the outer side being a cone-frustum-shaped structural body, wherein a workpiece inserting hole is formed in the bottom of the supporting table; a base is arranged below the supporting table, the base is connected with the outer side of the supporting table through a connecting column, and a mistake-proof hole coaxial with the workpiece inserting hole is formed in the base; a screw hole coaxial with the workpiece inserting hole is formed in the middle of the supporting table, and a level adjusting column is arranged in the screw hole; the inner diameter size of the mistake-proof hole is close to the upper limit of the outer diameter size after the opening sealing ring is normally closed; and a wedge-shaped groove is formed in the position, away from the connecting column, of the base, and the mistake-proofing hole is