Abstract: A weed burner, which relates to an apparatus for killing unwanted plants and solves problems of resistance heating manner such as low thermal efficiency and high maintenance cost; a technical solution to solve the problems mainly includes a control arm, a burner tip, a housing, and a heater, the burner tip being connected to the control arm, the control arm being movably connected to the housing; the heater includes an electromagnetic coil that is secured to the housing; the burner tip includes a magnetizer that is electromagnetically heated; the burner tip has a heating position where the magnetizer is located in the electromagnetic coil to perform heating and an operating position where the magnetizer is located outside the electromagnetic coil to perform weed burning, an operating temperature of the magnetizer being not lower than 200° C. The weed burner has an extended service life and a reduced use cost.

Abstract: A rotary mechanism and a handheld tool, which relates to mechanical regulation. The rotary mechanism including a first part, a second part, and a rotary locking assembly, a mounting portion being provided on the first part, the second part having a rotary portion adapted to the mounting portion; the rotary portion and the mounting portion are rotatably sleeving-fitted, the rotary locking assembly includes a sliding block and a rotary drive element, the sliding block is mounted on the rotary portion, and the rotary drive element rotates to bring the sliding block to move radially along the rotary portion so that the sliding block is locked on the mounting portion or is unlocked from the mounting portion.

Abstract: A weed burner includes a main body and handle, the main body including base and operating portions, the base portion connects to the handle, the operating portion projecting forwardly from the base portion; the operating portion includes an arcing chamber for letting in a plant and an electrode assembly for discharging high-voltage arcs to the plant, the arcing chamber extending through the operating portion, a bottom end of the arcing chamber being opened and located at an underside of the operating portion; and the electrode assembly includes a positive electrode and a negative electrode, the positive electrode being disposed in the operating portion and tilting downward into the arcing chamber, the negative electrode being disposed at an underside of the operating portion and surrounding an opening of the bottom end of the arcing chamber.