JPH0353797Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lap fillet welding machine that automatically welds the edges of steel plates whose edges are overlapped.

Generally, in shipbuilding and other industrial fields, various fillet welding machines that automatically perform fillet welding of steel plates are used. These fillet welding machines basically consist of a cart that automatically travels over the steel plate, and is attached to this cart and rolls along the T-joint or lap joint, moving the cart along the weld. It consists of an arm and rollers that guide the robot.

In such a fillet welding machine, it is important to accurately and reliably guide the welding torch to the weld.

Conventional fillet welding machines include those in which a welding torch is attached to the above-mentioned arm, and those in which a welding torch is attached to a truck.

The former type has the advantage that the welding torch can be accurately guided to the welding part because the roller that contacts the welding part and the welding torch move together through the arm.

However, relatively thick power supply lines, inert gas piping, etc. are connected to this welding torch, and these have poor flexibility. Therefore, in the former type of fillet welding machine, the free rotation of the arm is hindered, and the responsiveness of the arm to irregularities in the joint is reduced, and if the cart is tilted, the arm may There are problems in that it may move along with the trolley and the structure is complicated. Therefore, when welding the edges of stacked steel plates, that is, when performing fillet welding at a lap joint, there is only a step equal to the thickness of the steel plates, so the former type The rollers tend to come off the edges of these stacked steel plates. For this reason, this type of fillet welding machine can only be used for fillet welding of joints where there is no possibility of the roller coming off the weld, that is, T-joints where steel plates are arranged orthogonally.

Therefore, when performing fillet welding of a lap joint as described above, that is, lap fillet welding, a fillet welding machine such as the latter type in which a welding torch is attached to a truck is suitable.

FIG. 1 shows the construction of a conventional lap fillet welding machine of the latter type. In other words, 1 in the figure
A and 1b are steel plates to be welded, and the edge of the steel plate 1b is superimposed on the steel plate 1a, and this edge is fillet welded. Further, numeral 3 in the figure is a cart of this welding machine, and this cart 3 is provided with wheels 4 and is configured to run on the steel plate 1a. Further, a horizontal arm 5 is provided to protrude laterally from the bottom of the truck 3. A copying roller 6 is rotatably attached horizontally to the tip of the arm 5. Also, the above trolley 3
A welding torch 7 is attached to.

In such a welding machine, the copying roller 6 is horizontally rolled into contact with the edge end surface of the steel plate 1b, and the bogie 3 is guided by the copying roller 6 to move the bogie 3 along the edge of the steel plate 1b. The steel plates 1a and 1b are overlapped and fillet welded using a welding torch 7.

By the way, in such a device, since the arm 5 is fixed to the trolley 3, when the trolley 3 vibrates up and down during traveling, the roller 6 also vibrates up and down, and this roller 6 moves against the steel plate 1b. There was a problem with it coming off the edge. Furthermore, since these arms 5 are fixed to the trolley 3, for example, if the roller 6 of one arm 5 vibrates on an uneven area, the trolley 3 will also vibrate, causing the welding torch 7 to move. In addition, the roller of the other arm sometimes moved and came off the end face of the steel plate 1b.

The present invention has been developed based on the above circumstances, and an object of the present invention is to provide a lap fillet welding machine that is guided and travels reliably and accurately along the edge of a steel plate.

In other words, the present invention includes a trolley that runs on a steel plate,
It is equipped with a welding torch that fillet welds the edges of stacked steel plates that are attached to this truck, and a pair of arms that are rotatably attached to this truck and are spaced apart from each other in the front and back direction of this truck. , the base ends of these arms are attached to the upper surface of the above-mentioned trolley so as to be freely rotatable in the vertical direction, and each of these arms is attached so as to be freely rotatable independently,
Further, the tips of these arms extend to the sides of the cart and are bent downward, and the tips of these arms are urged by gravity to rotate downward. ing. moreover,
At the tip of each of these arms, a copying roller is rotatably provided, which is in diagonal contact with the edges of the stacked steel plates to guide the traveling of the truck.

In such a fillet welding machine, the rollers are brought into oblique contact with the end face of the edge of the steel plate, and the main body is guided along this edge by these rollers.

These arms can freely rotate up and down and are urged to rotate downward by gravity, and since these arms are not equipped with any welding torches, etc. The roller at the tip follows precisely along the edge of the steel plate and does not deviate from the end face of this edge. In addition, even if this roller vibrates due to temporary welds on the edges of stacked steel plates or other irregularities, this vibration is absorbed by the rotation of the arm and transmitted to the trolley. There is no problem, so this trolley is guided stably.

Furthermore, since a pair of arms are provided that are spaced apart in the front-rear direction of the truck, the truck can be reliably guided by the pair of arms.

Furthermore, these arms are configured so that they can freely rotate independently of each other, so even if one arm vibrates due to the unevenness of the edge of the steel plate, this vibration will not be transmitted to the other arm. There is no influence, and the cart can be guided more reliably and stably.

Further, the base ends of these arms are rotatably attached to the upper surface of the truck, the distal ends thereof are bent downward, and the rollers are obliquely attached to these distal ends. Therefore, this roller is located considerably below the center of rotation of the proximal end of this arm. Therefore, when these rollers are pressed horizontally against the end surfaces of the edges of the stacked steel plates due to the movement of this cart, the arm is rotated further downward due to this horizontal pressing force. biased in the direction of
The urging force in the downward rotation direction is proportional to the force with which the roller is horizontally pressed against the end surface of the edge of the steel plate. Since this roller is in diagonal rolling contact with the end face of the edge of the steel plate, it is easy for this roller to come off from the end face when a strong horizontal pressing force is applied.
As mentioned above, as the pressing force in the horizontal direction increases, the biasing force in the direction of rotating the arm downward also increases, and as a result, this roller is pressed downward more strongly, causing it to come off the end surface. This is something that can definitely be prevented.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 2 and 3. In these figures, 10a, 1
0b is a steel plate to be welded, one steel plate 10
The edge of the other steel plate 10b is placed on top of a, and the upper surface of one steel plate 10a and the end face of the edge of the other steel plate 10b are fillet welded.

Next, the configuration of a welding machine that performs such lap fillet welding will be explained. 11 in the figure is a trolley,
This truck 11 is provided with, for example, four wheels, and these wheels allow this truck 11 to freely run on this steel plate 10a. Further, reference numeral 13 is a controller, and the controller 13 is configured to control the running of the above-mentioned truck 11 and other operations.

The base end portions of a pair of arms 14, 14 are pivotally connected to the upper surface of this truck 11 by bearings 15, 15, respectively, so as to be freely rotatable in the vertical direction. These pair of arms 14, 14 are connected to this truck 11.
The arms 14, 14 are arranged so as to be spaced apart from each other in the traveling direction, that is, in the front-rear direction, and these arms 14, 14 are pivotally connected so that they can rotate independently of each other.

The tips of these arms 14, 14 are extended to the sides of this truck 11, and these tips are bent diagonally downward. Copying rollers 16, 16 are rotatably attached to the tips of these arms 14, 14, respectively. These copying rollers 16, 16 are mounted so as to rotate in a plane that is oblique, that is, inclined with respect to the vertical or horizontal direction, for example, in a plane that forms an angle of 45° with respect to the vertical or horizontal plane.

Further, these arms 14, 14 are urged by gravity so that their tips rotate downward. Therefore, these copying rollers 16, 16
is pressed downward by gravity, contacts the upper surface of the steel plate 10a and the end face of the edge of the steel plate 10b, and is configured to guide the traveling of the cart 11 along the edge of the steel plate 10b.

In addition, a mounting member 1 is provided at the rear of the above-mentioned trolley 11.
A welding torch 17 is attached via 8. This welding torch 17 is attached to the mounting member 1.
8, the mounting position thereof is configured to be freely adjustable.

Next, the operation of this embodiment will be explained. first,
This trolley 11 is placed on the steel plate 10a, and the copying rollers 16, 16 at the tips of the arms 14, 14 are brought into contact with the end surface of the edge of the steel plate 10b. Then, this cart 11 is run along the edge of the steel plate 10b. In this case, the running direction of this truck 11 is slightly deflected in a direction approaching the edge of the steel plate 10b. Therefore, the above-mentioned copying rollers 16, 16 are made of steel plate 10b.
run along the edge of Then, the edges of the steel plate 10b are fillet welded using a welding torch 17 provided on the trolley 11. In this case, the arms 14, 14 are pivotally connected to the truck 11 so as to be able to rotate up and down, and are urged downward by gravity, so that the truck 11 vibrates up and down. Also, even if the rollers 16, 16 vibrate due to unevenness on the edge of the steel plate 10b, these rollers 16, 16
It is absorbed by the vertical rotation of 4 and 14. Therefore, this trolley 11 can be guided stably, and the rollers 16, 16 can be made to accurately and reliably follow the edge of the steel plate 10b.
6 and 16 from coming off the edge of the steel plate 10b.

Furthermore, since these arms are not provided with any welding torches or the like, the rollers at the tips of these arms roll accurately following the edge of the steel plate and do not come off the end face of this edge. In addition, even if this roller vibrates due to temporary welds on the edges of stacked steel plates or other irregularities, this vibration is absorbed by the rotation of the arm and transmitted to the trolley. There is no problem, so this trolley is guided stably.

Furthermore, since a pair of arms are provided that are spaced apart from each other in the longitudinal direction of the truck, the truck can be reliably guided by the pair of arms.

Furthermore, these arms are configured so that they can freely rotate independently of each other, so even if one arm vibrates due to the unevenness of the edge of the steel plate, this vibration will not be transmitted to the other arm. There is no influence, and the cart can be guided more reliably and stably.

Further, the base ends of these arms are rotatably attached to the upper surface of the truck, the distal ends thereof are bent downward, and the rollers are obliquely attached to these distal ends. Therefore, this roller is located considerably below the center of rotation of the proximal end of this arm. Therefore, when these rollers are pressed horizontally against the end surfaces of the edges of the stacked steel plates due to the movement of this cart, the arm is rotated further downward due to this horizontal pressing force. is biased in the direction of
The urging force in the downward rotation direction is proportional to the force with which the roller is horizontally pressed against the end surface of the edge of the steel plate. Since this roller is in diagonal rolling contact with the end face of the edge of the steel plate, it is easy for this roller to come off from the end face when a strong horizontal pressing force is applied.
As mentioned above, as the pressing force in the horizontal direction increases, the biasing force in the direction of rotating the arm downward also increases, and as a result, the roller is pressed downward more strongly, causing the roller to come off the end surface. This is definitely prevented.

As described above, according to the present invention, it is possible to accurately and reliably guide the cart along the edge of the steel plate, and the copying rollers attached to the tip of the arm reliably follow the edge of the steel plate, and these copying rollers follow the edge of the steel plate. This has great effects, such as reliably preventing it from coming off the end face.

[Brief explanation of drawings]

FIG. 1 is a front view of a conventional example. 2 and 3 show an embodiment of the present invention, with FIG. 2 being a plan view and FIG. 3 being a view taken along the - arrow in FIG. 11...Dolly, 12...Wheel, 14...Arm, 15...Bearing, 16...Copying roller, 17...
...Welding torch.

Claims (1)

[Claims for Utility Model Registration] A welding machine for fillet welding the edges of a plurality of overlapping steel plates, comprising: a cart that runs over the above steel plates; It is equipped with a welding torch for fillet welding edges, and a pair of arms rotatably attached to this truck and arranged spaced apart from each other in the front and back direction of this truck, and these arms have their base ends attached to the truck. It is attached to the upper surface of the truck so that it can freely rotate in the vertical direction, and each of these arms is attached so that it can rotate independently, and the tips of these arms extend to the sides of the trolley. These arms are biased by gravity so that their tips rotate downward, and each of the arms has the above-mentioned stacked steel plates at the tips. A lap fillet welding machine characterized in that a copying roller is rotatably provided for guiding the traveling of the above-mentioned cart by diagonally contacting the green of the above-mentioned cart.