ADJUSTABLE TOOL HEAD MECHANISM， PORTABLE ELECTRIC TOOL， AND TOOL HEAD ADJUSTMENT METHOD

An adjustable tool head mechanism comprises a tool head (1)， a cover plate (2)， and a handle assembly (3). An end of the cover plate is rotatably connected to outer sidewalls of two sides of the tool head. A fastener (4) is disposed on the cover plate. The handle assembly extends into the cover plate from another end of the cover plate， and is rotatably connected thereto. An end of the fastener is engaged with the handle assembly， and another end of the fastener is engaged with the tool head. When the handle assembly is moved， the fastener is driven to move in an axial direction of the handle assembly， such that the fastener is engaged with or separated from the tool head. Further comprised are a portable electric tool provided with the adjustable tool head mechanism， and a tool head adjustment method. Rotating the handle assembly of the portable electric tool drives the fastener to separate from the tool head， thereby realizing adjustment of the tool head by means of rotation and enabling convenient operation.