Change gear protection structure for numerical control milling machine

The utility model belongs to the field of parts of numerical control milling machines, and particularly relates to a speed change gear protection structure for a numerical control milling machine, which comprises two symmetrically distributed mounting plates, two symmetrically distributed mounting holes are formed in each of the two mounting plates, and a protection shell is arranged between the two mounting plates. The protective shell formed by combining the left shell and the right shell is arranged between the two mounting plates, before work, a worker rotates the rotating rod, and under the mutual action of the two moving blocks and the two oppositely-arranged threads, the worker can rotate the rotating rod to drive the rotating rod to rotate the rotating rod to rotate the rotating rod to rotate the rotating rod. The left shell and the right shell can be clamped to form the protective shell, the assembled protective shell wraps and shields the speed change gear to protect the speed change gear, waste res