Clamping mechanism and electric tool

A clamping mechanism, comprising a main body, a locking cap, a spring chuck and an outer sleeve which is sleeved on a periphery of the locking cap and is configured to drive the locking cap to rotate;

• the spring chuck comprises at least two spring claws which are circumferentially arranged to form a clamping claw hole;
• the locking cap is connected with the main body, and the locking cap is able to move in a direction close to the main body, so that the at least two spring claws are close to each other under a pressing action of an inner wall of the locking cap to achieve clamping, or move in a direction away from the main body, so that the spring claws are loosened;
• a ring piece is arranged at an end, close to the main body, of the locking cap, and an elastic piece is arranged between the ring piece and the locking cap;
• a first groove is arranged on an inner wall of the outer sleeve, and a cam block cooperating with the first groove is arranged on the ring piece;
• and when the cam block is rotated into the first groove, the ring piece cooperates with the main body under an action of the elastic piece, so as to limit a rotation of the locking cap relative to the main body in the direction away from the main body when the spring claws are clamped, and when the cam block is moved out of the first groove, the ring piece is disengaged from the main body.