Spot welding apparatus

Patent metadata

Field	Value
Publication number	US-9849540-B2
Application number	US-201414556289-A
Country	US
Kind code	B2
Filing date	Dec 1, 2014
Priority date	Jul 28, 2014
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

A spot welding apparatus includes a stationary frame having a housing formed therein. An upper welding gun is mounted to a length direction of a pressing unit disposed in the housing of the stationary frame. A plurality of lower welding guns are mounted on an outside of the stationary frame and ends of the plurality of lower welding guns selectively face one end of the upper welding gun in a length direction of the lower welding guns by the plurality of lower welding guns. A plurality of actuators are mounted on the outside of the stationary frame. A plurality of link units are disposed between the actuators and the lower welding guns, connect the actuators and the lower welding guns, respectively, and rotate as the actuators are operated.

First claim

What is claimed is:

1. A spot welding apparatus comprising:
a stationary frame having a housing formed therein, in which one end of the stationary frame in a length direction of the stationary frame is opened;
an upper welding gun mounted to one end of a pressing unit in a length direction of the pressing unit which is provided in the housing of the stationary frame;
a plurality of lower welding guns mounted to an outside of the stationary frame, ends of the plurality of lower welding guns selectively facing one end of the upper welding gun in a length direction of the lower welding guns by selectively rotating to accommodate positions of spots to be welded;
a plurality of actuators mounted to the outside of the stationary frame corresponding to the plurality of lower welding guns, the actuators rotating the plurality of lower welding guns, respectively; and
a plurality of link units disposed respectively between the actuators and the lower welding guns, connecting the actuators and the lower welding guns, respectively, and rotating as the plurality of actuators operate, and
wherein a length direction of the upper welding gun is parallel to the length direction of the stationary frame and the upper welding gun moves back and forth in the length direction of the stationary frame by the pressing unit,
wherein ends of the plurality of link units are rotatably connected to the stationary frame, wherein the plurality of lower welding guns comprises: a first lower welding gun including a first swing arm provided at one end of the first swing arm with a first lower welding tip, and a second lower welding gun including a second swing arm provided at one end of the second swing arm with a second lower welding tip,
wherein the first and second swing arms have shapes and sizes different from each other to accommodate different spots to be welded.

2. The spot welding apparatus of claim 1 , wherein the pressing unit includes:
a drive motor provided at one side of the pressing unit in the length direction of the pressing unit;
a screw shaft connected to the drive motor to rotate therewith; and
a movable block coupled to the screw shaft to reciprocate in a length direction of the screw shaft and connected to the upper welding gun.

3. The spot welding apparatus of claim 1 , wherein the first swing arm has another end coupled to a first hinge point such that the first swing arm is rotatable on the first hinge point which is mounted on the stationary frame.

4. The spot welding apparatus of claim 1 , wherein the second swing arm has another end coupled to a second hinge point such that the second swing arm is rotatable on the second hinge point which is mounted on the stationary frame.

5. The spot welding apparatus of claim 1 , wherein the plurality of actuators comprise:
a first actuator coupled to the stationary frame by a third hinge point such that the first actuator is rotatable on the third hinge point disposed at one side of the stationary frame in the length direction of the stationary frame; and
a second actuator coupled to the stationary frame by a fourth hinge point such that the second actuator is rotatable on the fourth hinge point disposed at another side of the stationary frame in the length direction of the stationary frame,
wherein the first and second actuators have operating rods which reciprocate in a length direction of the operating rods, respectively.

6. The spot welding apparatus of claim 5 , wherein each of the plurality of link units includes:
a first connection link having one end rotatably connected to the stationary frame; and
a second connection link having one end rotatably connected to another end of the first connection link and another end of the second connection link rotatably connected to the first lower welding gun or the second lower welding gun,
wherein the another end of the first connection link rotatably connected to the second connection link is rotatably connected to a front end of the operating rod of the first actuator or the second actuator by an extension end extending towards the first actuator or the second actuator.

7. The spot welding apparatus of claim 6 , wherein the one end of the first connection link is rotatably connected to a connection end projecting from or mounted to the outside of the stationary frame through a fifth hinge point, and the extension end is connected to the front end of the operating rod of the first or the second actuator through a sixth hinge point.

8. The spot welding apparatus of claim 7 , wherein the another end of the second connection link is connected to the first or the second lower welding gun through a seventh hinge point, and the one end of the second connection link is connected to the first connection link through a link point.

9. The spot welding apparatus of claim 8 , wherein the second connection link is parallel to the length direction of the upper welding gun when the first or the second lower welding tip faces the one end of the upper welding gun.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Lee So Young
• Ryu Sung Phil

Classifications

• B23K11/115 Primary

  by means of two electrodes placed opposite one another on both sides of the welded parts · CPC title

• B23K11/3072

  Devices for exchanging or removing electrodes or electrode tips · CPC title

• B23K11/312

  for several electrodes · CPC title

• B23K11/315

  with one electrode moving on a linear path · CPC title