COOLANT CIRCULATOR OF SPOT WELDING GUN

摘要

According to the present invention, disclosed is a coolant circulator of a spot welding gun, to provide a means capable of preventing leak of coolant when a welding tip is replaced in a shank of a spot welding gun. The coolant circulator comprises: a first cooling line including a first cooling section formed along the inside of an upper welding unit, and a first and a second check valve which are respectively installed in a first inflow cooling line to supply coolant to the first cooling section and a first discharge cooling line to discharge the coolant from the first cooling section; a second cooling line including a second cooling section formed along the inside of a lower welding unit, and a third and a fourth check valve which are respectively installed in a second inflow cooling line to supply the coolant to the second cooling section and a second discharge cooling line to discharge the coolant from the second cooling section; a third cooling line including a third cooling section formed along the inside of a heating unit, and a fifth check valve to prevent the coolant from sequentially flowing backward along the third and the first cooling line from a drain hole when a part of the first cooling line is exposed to atmospheric pressure; a first manifold to distribute the coolant to the first and the third cooling line from a coolant supply line connected to a coolant supply source; and a second manifold to guide the coolant to a drain line connected to the drain hole from the first and the third cooling line.