Head and body rapid replacing structure of multi-functional power tool and multi- functional power tool

A head and body rapid replacing structure of a multi-functional power tool, comprising:

• a body shell (100);
• a torsion ring (200) which is rotationally arranged in the body shell and near a socket of the body shell and of which the axis is at least parallel to that of the socket;
• a head (300) detachably inserted in a jack (220) of the torsion ring (200), wherein a shell of the head comprises a connector, the connector comprises a square sleeving part and a limiting part, a clamping platform extending from an inner end to an outer end for a certain distance is formed on at least one side wall of the sleeving part, and a clamping slot is formed between the clamping platform and an inner end face of the limiting part;
• an energy storage device (400) resetting after driving the torsion ring (200) to rotate;
• head locking pieces (500) that can move in a straight line between a first position and a second position along the direction perpendicular to the axis of the torsion ring (200) during the rotation of the torsion ring (200);
• in the first position, each head locking piece (500) has a blocking part which is located on the movement path of the clamping platform of the head (300) in the jack (220);
• in the second position, each head locking piece (500) does not have a part located in the movement path of the clamping platform,
• a fixed plate coaxial with the torsion ring is arranged in the body shell, and the spacing between the fixed plate and the head locking piece is equivalent to the width of the clamping platform.