Hardness detection device for cutter of shield tunneling machine

The utility model discloses a shield tunneling machine cutter hardness detection device which comprises a machine frame, an impact block and a control mechanism, one side of the machine frame is provided with a fixing groove used for fixing a shield tunneling machine cutter, and the other side of the machine frame is provided with the control mechanism. The impact block is slidably arranged on the rack, one side of the impact block is connected with one side of the output end of the control mechanism, and the other side of the impact block is provided with a detection head; the control mechanism comprises a reciprocating mechanism and a distance adjusting mechanism, the reciprocating mechanism comprises a first motor, a rotating disc and a connecting rod, and the output end of the first motor is connected with the center of the rotating disc; a sliding rail is arranged in the radial direction of the rotating disc, a sliding block is arranged on the sliding rail in a sliding mode, and the output end of the dis