Special lifting appliance for cast iron pipe preheating furnace

The utility model provides a special lifting appliance for a cast iron pipe preheating furnace, which comprises a lifting arm, two clamping pieces are arranged below the lifting arm, the two clamping pieces are connected with sliding block structures arranged at two ends of the lifting arm, the lifting arm comprises a fixed cylinder, adjusting cylinders are arranged at two ends of the fixed cylinder, and each sliding block structure comprises two sliding sleeves. The two sliding sleeves are arranged outside the two adjusting cylinders in a sleeving mode respectively and are in sliding fit with the adjusting cylinders, and the inner sides of the sliding sleeves are connected with adjusting devices arranged in the adjusting cylinders. Compared with a traditional lifting appliance special for a preheating furnace, the lifting appliance has the advantages that the clamping pieces are connected with the sliding sleeve arranged on the outer side of the adjusting cylinder in a sleeving mode through the bolt connecti