Quick change structure of cutting machine

Abstract

A motor output shaft penetrates through a positioning table and is rotationally connected with the positioning table, a cutting blade pre-tightening structure is further coaxially arranged at the front end of the motor output shaft, the rear end of the cutting blade pre-tightening structure penetrates through a cutting blade axis hole, and the front portion of the cutting blade pre-tightening structure is tightly attached to the front surface of a cutting blade. The cutting blade pre-tightening structure comprises a positioning shaft and a positioning block, the positioning shaft and the motor output shaft are coaxially fixed, the cutting blade penetrates through the rear end of the positioning shaft, a positioning block containing groove is formed in the front end of the positioning shaft in the circumferential direction of the motor output shaft, and the positioning block containing groove is formed in the axial direction and penetrates through the front surface and the rear surface of the positioning shaft. One end of the positioning block is inserted in the positioning block containing groove in the radial direction, the other end of the positioning block protrudes out of the positioning block containing groove, and the rear end, protruding out of the positioning block containing groove, of the positioning block abuts against the front surface of the cutting blade. According to the utility model, the cutting blade can be quickly replaced under the condition that a special tool is not used.

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