KR20060001222A - Laser welding system - Google Patents

Abstract

Laser welding system according to the present invention, the robot arm (Robot Arm); A laser welding device mounted on one side of the robot arm and irradiating a laser beam to a welding target; A pressure roller for pressing the welding object during welding; And a connecting unit connecting the pressure roller to the robot arm such that the pressure roller is rotatable with respect to the laser welding device. The connection unit, the fixed portion fixed to the robot arm; A movable part rotatably mounted to the fixed part and to which the pressure roller is connected; A bearing disposed between the movable portion and the fixed portion; And a pressure roller driver for rotating the pressure roller. It includes. The pressure roller drive unit rotates the movable unit using air pressure. The pressure roller drive unit, the cylinder housing is configured to receive the air pressure; A piston disposed in the cylinder and configured to perform a linear reciprocating motion in the cylinder by the air pressure; And a rod connected to the piston and having a first gear formed therein, wherein the movable part is engaged with the first gear so that the movable part rotates in response to a linear reciprocating motion of the rod. Gear teeth are formed.

Laser Welding System, Pressure Roller, Robot Arm, Cylinder, Rod, Gear

Description

Laser Welding System {LASER WELDING SYSTEM}

1 is a view showing a laser welding system according to the prior art.

2 is a view showing a laser welding system according to an embodiment of the present invention.

Figure 3 is an exploded perspective view of the connection unit of the laser welding system according to an embodiment of the present invention.

4 and 5 are views showing the rotation of the pressure roller by the pressure roller drive unit of the laser welding system according to an embodiment of the present invention.

Figure 6 is a view showing the driving principle of the pressure roller drive unit of the laser welding system according to an embodiment of the present invention.

The present invention relates to a laser welding device, and more particularly, to a laser welding device in which the direction of the pressure roller for pressing the welding target during laser welding is switched.

As is well known, a laser welding device for irradiating a laser beam is mounted on an industrial articulated robot arm together with a pressure roller system for pressing a panel to be welded at the time of welding.

At the time of welding of the body floor, welding is mainly performed between the floor panel and the member. The member has a side member and a cross member. Since the members are welded to the floor at right angles to each other, after welding the side members, to weld the cross members, the laser is used to adjust the welding direction during the welding. Rotation of the welding system was essential.

Referring to FIG. 1, in the conventional laser welding system, a laser welding device 3 and a pressure roller 5 for pressing a welding object are fixed to the robot arm 1 to form an integrated body.

In addition, since a laser light fiber (not shown) that transmits a laser beam is connected to the upper portion of the welding apparatus, when the welding system is rotated for the above purpose, the damage of the optical fiber is prevented. In order to operate the optical fiber in order to make the movement within the safe range, and the system is integrated as described above, there was a problem that the work time is consumed a lot.

Accordingly, it is an object of the present invention to provide a laser welding system that rotates the laser welding system more smoothly during laser welding to shorten working time and safely rotate without damaging the optical fiber.

Laser welding system according to the present invention to achieve the above object,

Robot arm;

A laser welding device mounted on one side of the robot arm and irradiating a laser beam to a welding target;

A pressure roller for pressing the welding object during welding; And

A connection unit connecting the pressure roller to the robot arm such that the pressure roller is rotatable with respect to the laser welding device;

It includes.

The connection unit,

A fixed part fixed to the robot arm;

A movable part rotatably mounted to the fixed part and to which the pressure roller is connected;

A bearing disposed between the movable portion and the fixed portion; And

A pressure roller driver for rotating the pressure roller;

It includes.

The pressure roller drive unit rotates the movable unit using air pressure.

The pressure roller drive unit,

A cylinder housing configured to receive air pressure;

A piston disposed in the cylinder and configured to perform a linear reciprocating motion in the cylinder by the air pressure; And

And a rod connected to the piston and having a first gear formed therein.

In response to the linear reciprocation of the rod, the movable part is provided with a second gear engaged with the first gear so that the movable part rotates.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a view showing a laser welding system according to an embodiment of the present invention.

As shown in FIG. 2, the laser welding system according to an exemplary embodiment of the present invention includes a robot arm 101 and a laser beam 125 mounted on one side of the robot arm 101. A laser welding device 103 for irradiating a welding object (not shown), a pressure roller 115 for pressurizing the welding object during welding, and the pressure roller 115 are the laser welding device. And a connecting unit 102 connecting the pressure roller 115 to the robot arm 101 so as to be rotatable about 103.

The laser welding device 103 is mounted on one side of the robot arm 101 to irradiate the laser beam 125 to the welding object (not shown), thereby performing a welding operation. At this time, as the robot arm 101 moves, the pressure roller 115 advances in the direction in which welding proceeds while pressing the welding object.

At this time, the direction in which the welding is performed is not limited to a straight line, it is possible to switch the welding direction.

Therefore, when the welding device 103 performs the welding, it will be possible to weld in a straight line only if the welding system does not rotate. Therefore, if the direction in which welding proceeds during the welding operation is changed, the welding system rotates to change the direction.

In the laser welding system according to the embodiment of the present invention, even when the welding direction is changed by the robot arm 101, the pressure roller 115 is rotated by the rotation of the movable part 113 included in the connection unit 102. By changing the direction of), welding can be performed while pressing the panel to be welded corresponding to the changed welding direction.

3 is an exploded perspective view of a part of the connecting unit 102 of the laser welding system according to the embodiment of the present invention.

2 and 3, the connection unit 102 is fixed to the robot arm 101 and a fixed part 111 and is mounted to be rotatable to the fixed part 111 and the pressure roller 115. ) Is connected to the movable portion 113, the bearing 121 is disposed between the movable portion 113 and the fixed portion 111 and the pressing roller drive unit 105 for rotating the pressing roller 115.

The fixing part 111 includes an upper fixing part 107 and a lower fixing part 109. The upper fixing part 107 is mounted to the robot arm 101, and the lower fixing part 109 is mounted below the upper fixing part 107.

2 and 3, a predetermined space is formed between the upper fixing part 107 and the lower fixing part 109. Although the fixing part 111 is fixed to the robot arm 101 in this embodiment, it is a matter of course that the fixing part 111 may be fixed to the laser welding apparatus 103.

Through holes 108 and 110 are formed in the centers of the upper fixing part 107 and the lower fixing part 109, respectively, and the laser welding device 103 is inserted into the through holes 108 and 110.

As shown in FIG. 3, the movable portion 113 connects an upper flange 112, a lower flange 122, and an upper flange 112 and a lower flange 122. Connection plate 114 is included. The upper flange 112 has a circular ring shape so that the through hole 124 is formed in the center thereof, and the lower flange 122 has a circular arc shape.

The upper bearing 117 and the lower bearing 119 are formed with through holes 118 and 120 in the center thereof.

The movable portion 113 is positioned between the upper fixing portion 107 and the lower fixing portion 109, and the upper bearing 117 is disposed between the upper surface of the upper flange 112 and the upper fixing portion 107 of the movable portion 113. The lower bearing 119 is disposed between the lower surface of the upper flange 112 of the movable part 113 and the lower fixing part 109.

The through hole 108 of the upper fixing part 107, the through hole 118 of the upper bearing 117, the through hole 124 of the upper flange 112 of the movable part 113, and the lower bearing 119 of the upper fixing part 107. The laser welding device 103 is inserted into the through hole 120 and the through hole 110 of the lower fixing part 109.

The upper and lower bearings 117 and 119 are disposed between the movable portion 113 and the upper and lower fixing portions 107 and 109 such that the movable portion 113 is rotatable with respect to the upper and lower fixing portions 107 and 109. do.

A connecting bar 116 is fixedly coupled to a lower portion of the movable part 113, and the pressure roller 115 is connected to a lower portion of the connecting bar 116. Therefore, when the movable part 113 rotates, the pressure roller 115 also rotates correspondingly.

4 and 5 are views showing the rotation of the pressure roller 115 by the pressure roller drive unit 105 according to the embodiment of the present invention.

6 is a view showing the driving principle of the pressure roller driving unit 105 according to the embodiment of the present invention.

In this embodiment, the pressure roller driver 105 rotates the movable part 113 using air pressure. However, it is a matter of course that the pressure roller drive unit 105 may use a force such as hydraulic pressure in addition to the air pressure.

Referring to Figure 6, the pressure roller drive unit 105, the cylinder housing 317 is configured to receive the air pressure, and is disposed in the cylinder housing 317 in the cylinder 317 by the air pressure A piston 315 is configured to perform a linear reciprocating motion, and includes a rod 200 connected to the piston 315. The pressure roller driver 105 is located on one side of the fixing part 111.

4 and 5, a first gear 201 is formed at a predetermined position of the rod 200, and a second gear 203 is disposed at a predetermined position of the outer circumferential surface of the upper flange 112 of the movable part 113. ) Is formed. As the first gear 201 and the second gear 203 are engaged with each other, the movable portion 113 rotates in response to the linear movement of the rod 200. At this time, it is preferable that the first gear 201 and the second gear 203 are formed so that the pressure roller 115 rotates in the range of 90 degrees, but the pressure roller 115 has an angle other than 90 degrees. It may rotate in the range of.

Further, preferably, the pressure roller drive unit 105 is the first and second solenoid valves (311, 313) for controlling the supply of air pressure to the space formed on both sides of the piston 315 in the cylinder housing 317 (Solenoid Valve).

Hereinafter, with reference to Figures 4 to 6 will be described the operation of the pressure roller drive unit 105 and the provisional part 113 accordingly.

When the first solenoid valve 311 is opened, air pressure is supplied to the space on the left side (in FIG. 6) of the piston 315 so that the piston 315 is pushed to the right side (in FIG. 6) by the air pressure. Thus, as shown in FIG. 4, the rod 200 mounted on the piston 315 is moved to the right (in FIG. 4), and as a result, the drive unit 113 rotates clockwise (in FIG. 4). do. As a result, the pressure roller 115 rotates around the laser welding device 103.

On the contrary, when the second solenoid valve 313 is opened, as shown in FIG. 5, the rod 200 moves to the left side (in FIG. 5) and the driving unit 113 rotates counterclockwise (in FIG. 5). Done. Therefore, the pressure roller 115 rotates around the laser welding device 103.

As shown in Figure 6, the driving principle of the pressure roller drive unit 105 according to the embodiment of the present invention is as follows. Based on the control signal of the laser welding robot control panel (not shown), the process control panel 309 generates and generates a load forward signal or a load backward signal through the load forward signal unit 301 or the load backward signal unit 303. The signal is transferred to the forward relay 305 or the reverse relay 307 to operate the forward relay 305 or the reverse relay 307. The forward relay 305 controls the opening and closing of the first solenoid valve 311 and the reverse relay 307 controls the opening and closing of the second solenoid valve 313. An air line 319 is connected to the first and second solenoid valves 311 and 313, and an air supply source 400 is connected to the air line 319. Accordingly, air pressure is supplied into the cylinder housing 317 in response to the operation of the solenoid valves 311 and 313.

The piston 315 inside the cylinder housing 317 is operated by the air pressure supplied to the cylinder housing 317, so that the pressure roller driving unit 105 is operated.

The laser welding robot control panel and the process control panel 309 may be replaced with another control system or device.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and easily changed and equalized by those skilled in the art from the embodiments of the present invention. It includes all changes to the extent deemed acceptable.

Since the pressure roller of the laser welding system according to the embodiment of the present invention can be rotated in response to a change in the welding direction at the time of welding, the working time can be shortened. Furthermore, since the rotation of the pressure roller can be rotated without damaging the optical fiber installed on the upper portion of the laser welding device, the process for preventing the damage of the optical fiber can be omitted and the welding work process can be simplified. .

Claims (4)

Robot arm; A laser welding device mounted on one side of the robot arm and irradiating a laser beam to a welding target; A pressure roller for pressing the welding object during welding; And A connection unit connecting the pressure roller to the robot arm such that the pressure roller is rotatable with respect to the laser welding device; Laser welding system comprising a. In claim 1, The connection unit, A fixed part fixed to the robot arm; A movable part rotatably mounted to the fixed part and to which the pressure roller is connected; A bearing disposed between the movable portion and the fixed portion; And A pressure roller driver for rotating the pressure roller; Laser welding system comprising a. In claim 2, The pressure roller drive unit is a laser welding system, characterized in that for rotating the movable portion using the air pressure. In claim 3, The pressure roller drive unit, A cylinder housing configured to receive air pressure; A piston disposed in the cylinder and configured to perform a linear reciprocating motion in the cylinder by the air pressure; And And a rod connected to the piston and having a first gear formed therein. And a second gear that is engaged with the first gear so that the movable part rotates in response to the linear reciprocating motion of the rod.

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