| 摘要 |
A multi-spot welder which reduces the welding time and can cope with the position of various welding points only through one cycle of the welding point movement by controlling a plurality of welding guns and forward and backward movements of the respective welding guns by a separate servo motor is provided. A multi-spot welder comprises: a welding robot, a plurality of transfer units connected to the welding robot, and a plurality of welding guns connected to the respective transfer units. The transfer units comprise a servo motor(61) in which bolt connecting holes are formed, a ball screw(62) rotated by the servo motor, a ball screw nut(63) engaged with the ball screw, a transfer shaft(64) which is connected to the ball screw nut, and of which a female screw is connected to the ball screw nut by screw(S), a case(65) in which bolt connecting holes are formed such that the bolt connecting holes are connected to the bolt connecting holes of the servo motor by bolts(B), an oilless bush(66) installed between the case and the transfer shaft, and a tapered roller bearing(67) for supporting the ball screw. The welding guns comprise an upper base(71) having an upper electrode(71a) installed at one side thereof, a lower base(72) which is connected to the upper base, on which a lower electrode(72a) is installed, and of which a vertical shaft(74) is inserted into an inserting groove of the upper base, and an air cylinder(73) having the upper electrode installed at an end of a piston thereof.
|
