Front-back adjustable tool rest for centerless grinding machine

The utility model relates to the technical field of keyway milling cutter machining, in particular to a front-back adjustable knife rest for a centerless grinding machine, which comprises a lower sliding plate, a stopping knife rest is slidably connected to the upper surface of the lower sliding plate, a knife rest dovetail is fixedly connected to the upper surface of the lower sliding plate, and a stud is in threaded connection with the inner wall of the stopping knife rest. A tool rest auxiliary rail is inserted into one end of the stud, the other end of the stud is matched with a tool rest dovetail, the inner wall of the stopping tool rest is in threaded connection with a tool rest front-back adjusting screw rod, the surface of the tool rest front-back adjusting screw rod is connected with a thrust bearing, and one end of the tool rest front-back adjusting screw rod is in threaded connection with a screw rod fixing base. When the knife board needs to advance, a spanner is used for twisting the spanner fixi