Grinding tool for valve seat of cylinder head of steam engine

The utility model relates to a grinding tool for a valve seat of a cylinder head of an automobile engine, which is characterized by comprising a grinding main body, a sliding sleeve, a limit screw, an adjusting screw, a spring and a positioning key, one end of the grinding main body is arranged in a main body through hole of the sliding sleeve, the other end of the grinding main body is positioned outside the sliding sleeve, the adjusting screw is arranged in an adjusting screw mounting hole of the sliding sleeve, and the spring is arranged in the adjusting screw mounting hole. The tail portion of the adjusting screw is located outside the sliding sleeve and integrally fixed with the sliding sleeve, one end of the spring is arranged in a spring installation chamber of the grinding body, the other end of the spring is sleeved on the head portion of the adjusting screw, an axial positioning key is arranged on the outer wall of the grinding body, a limiting screw is arranged on the sliding sleeve, and when the g