High-stability lifting knife rest for high-speed paper extraction machine

The utility model discloses a high-stability lifting knife rest for a high-speed paper extraction machine, and relates to the technical field of knife rest adjustment. The tool rest lifting device comprises two tool rest plates, a tool rest is arranged between the two tool rest plates, two tool rest lifting shafts are arranged on one sides of the tool rest plates, tool rest lifting movable seats are arranged on the peripheral sides of the tool rest lifting shafts in a sleeved mode, and positioning assemblies are arranged between the tool rest lifting shafts and the tool rest lifting movable seats. A connecting rod is arranged on one side of the knife rest base, and a worm gear is rotatably matched with the bottom face of the connecting rod. The worm is driven by the servo motor to drive the two worm gears to rotate at the same time, then the two lifting screws are driven to rotate to adjust the height of the knife rest, the knife rest plate is manually pulled to drive the knife rest lifting shaft to slide in