Shearing mechanism

The utility model discloses a shearing mechanism. The shearing mechanism comprises a fixed seat, a cutting knife and a cutting connection rod arranged on the fixed seat. A fixed shaft is arranged on one end of the cutting connection rod. A driving wheel is arranged on the other end of the cutting connection rod and is connected with a transmission wheel via a belt. A centrifugal shaft is arranged on the transmission shaft. The cutting knife is arranged on the centrifugal shaft. Via the arrangement of the cutting connection rod, maintenance and repair for a mechanical device can be easily performed. According to the utility model, the original cam transmission structure is changed into a belt connection rod transmission type structure, so instability caused by abrasion during rotation of the original structure is overcome; instant impact force during the shearing process is added, so a failure of cutting off and a problem of being stuck are overcome; and when the belt fails, a screw rod can be connected with the motor so as to drive the cutting knife to rotate and work via the motor, so the shearing mechanism is highly practical.