Tire changer

A tire changer comprising:

• a base;
• a wheel holder mounted on the base;
• a tool bearing device that is arranged on the base and can drive a disassembly tool to move in the horizontal and vertical directions,
• wherein the tire changer includes a slider;
• a supporter;
• and a first driving device, wherein the supporter is fixed on the base;
• the tool bearing device is fixed on the slider;
• and
• the first driving device is connected to the slider and the first driving device can drive the slider to slide along the vertical direction on the supporter;
• wherein the tire changer includes a positioning mechanism, to position the slider when the slider moves to a lowered position;
• wherein the positioning mechanism includes a first engaging piece and a second engaging piece;
• the first engaging piece is fixed externally on a side wall of the slider;
• the second engaging piece is fixed on an upper end of the supporter;
• the first engaging piece and the second engaging piece are respectively provided in the form of a trapezoidal protrusion and a trapezoidal groove, respectively, or the first engaging piece and the second engaging piece are respectively provided in the form of a trapezoidal groove and a trapezoidal protrusion, respectively, and
• wherein the trapezoidal protrusion and the trapezoidal groove are engaged with each other when the slider moves to the lowered position, such that two oblique edges of the trapezoidal protrusion and the trapezoidal groove are in contact with one another, for maintaining the position of the disassembly tool to be in both the horizontal and vertical directions.