Protective assembly for laser engraving

The protection assembly comprises a rack, a first protection plate connected to the upper portion of the rack in a sliding mode and a second protection plate connected to the front side of the rack in a sliding mode, a workbench used for containing workpieces is arranged on the front portion of the rack, and a laser generation assembly is fixed to the rear side of the rack. The first protection plate can move in the front-back direction and comprises a top plate, a left side plate and a right side plate, the upper end of the left side plate is fixedly connected with the left end of the top plate, the lower portion of the left side plate is in sliding fit with the left side face of the rack, the upper end of the right side plate is fixedly connected with the right end of the top plate, and the lower portion of the right side plate is in sliding fit with the right side face of the rack. The second protection plate can move up and down, and when the first protection plate and the second protection plate slide to