Gas filling machine of automotive expansion valve

The utility model discloses a gas filling machine of an automotive expansion valve, comprising a spot welding machine, an air feeding pipe, an air discharging pipe, a fixed bracket, a workpiece fixing frame, a sealing ring, an upper dialing rod, an upper fastening bolt, a lower dialing rod and a lower fastening bolt. The gas filling machine is applicable to filling the gas of certain pressures into the expansion valve and carries out the production of the sealed workpiece by adopting the spot welding process. the sealing solders and the expansion valve are sequentially arranged in the fixed bracket; the upper dialing rod and the lower dialing rod are rotated, the sealing solders and the expansion valve are tightly pressed by an upper butting block and a lower butting block so that the expansion valve is arranged in a sealed environment; after being vacuumed, the expansion valve is filled with a special gas so that the pressure achieves the prearranged value; subsequently the spot welding is carried out; and t