Ram thermal deformation compensation mechanism of numerical control machine tool

The utility model relates to a ram thermal deformation compensation mechanism of a numerical control machine tool. The ram thermal deformation compensation mechanism of the numerical control machine tool is characterized in that a ram front end rectangular part is fixed on an upper end fixed support, a sliding support is installed between the upper end fixed support and a lower end fixed support, a connecting rod parallelly penetrates through holes in the three supports, the lower end of the connecting rod is fixed in the lower end fixed support of the lower end of the long edge of the ram, the upper end fixed support is connected with a read head connecting block through a support chip, a grating ruler read head and a ram movable axis grating ruler are fixed on the side face of the upper end fixed support, and the read head connecting block is fixedly connected with the upper end of the connecting rod. When the length of the ram changes, the front end of the ram drives the connecting rod to synchronously stretch, actual elongation is obtained by the read head which is fixed with the connecting rod together and is fed back to a numerical control system, and the numerical control system controls a servo motor to compensate elongation in real time. According to the ram thermal deformation compensation mechanism of the numerical control machine tool, the problem that machining precision is affected due to the fact that a numerical control machine tool ram deforms due to temperature changing is solved. In addition, the ram thermal deformation compensation mechanism of the numerical control machine tool has the advantages of being wide in application range, simple in structure, convenient to install, high in positioning precision and the like.