Rapid and accurate sleeve replacing device for engine connecting rod production

The utility model belongs to the field of engine connecting rod machining technical equipment, and particularly relates to a quick and accurate sleeve replacing device for engine connecting rod production, which comprises a working table in an n-shaped design, a large positioning rod is arranged on the rear side above the working table, and a sleeve replacing hole is formed in the front side above the working table. A large head positioning mechanism is arranged at the corner of the portion, close to one side of the large positioning rod, of the workbench, a small head positioning mechanism is arranged at the corner of the portion, close to one side of the sleeve replacing hole, of the workbench, and an end face abutting mechanism is arranged at the portion, located between the large positioning rod and the sleeve replacing hole, of one side of the workbench. And a sleeve changing auxiliary mechanism is arranged above the workbench corresponding to the sleeve changing hole. The clamping device is reasonable i