JPS6033581B2 - Welding torch transport truck - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding torch transport vehicle that carries a welding torch such as a carbon dioxide gas welding machine and moves by itself along a welding line to realize automatic welding.

FIGS. 1 and 2 show the basic structure of a conventional hot saddle torch conveying truck of this type.

A front tracing mechanism 2 and a rear tracing mechanism 3 are rotatably supported at the front and rear portions of a vehicle body 1 that supports a welding torch (not shown), respectively. Further, a front wheel 4 and a rear axle 5 are rotatably supported at the front and rear portions of the vehicle body 1, respectively.

Here, the direction of the axes of these axles 4 and 5 is the same as that of the copying wheel 2.
, 3 (corresponding to the melted line 12 in FIG. 1), and is fixed in a slightly oblique direction with respect to a direction perpendicular to a common tangent to the lines 12 (corresponding to the melted line 12 in FIG. 1). That is, each of the axles 4 and 5 has a follower wheel 2 and 3.
It is supported by the vehicle body 1 such that the end on the opposite side is located slightly further forward than the end on the opposite side. Two front wheels 6 and 7 having the same diameter are attached to both ends of the front axle 4.

Similarly, two rear wheels 8 and 9 having the same diameter are attached to both ends of the rear axle 5. Further, the rear axle 5 is driven and rotated in the forward direction by a drive device (not shown) attached to the vehicle body 1. Next, the operation of this conventional welding torch carrier will be explained using an example in which horizontal fillet welding is performed.

In addition, the material to be welded is placed horizontally, 11 is the material to be welded vertically to be fillet welded, and 12 is the welding line. Now, when welding, the vehicle body 1 is placed on the workpiece 10 via the front wheels 6, 7 and the rear wheels 8, 9, and the tracing wheels 2, 3 are placed on the surface of the workpiece 11. bring into contact. In this state, when the drive device rotates the rear axle 5 in the forward direction (arrow A indicates the traveling direction of the vehicle body), the front axle 4 and the rear axle 5 are supported diagonally by the vehicle body 1 as described above. Therefore, the force acting on the vehicle body 1 at this time is based on the front side tracing theory 2.
A component that tries to press the rear side tracing wheel 3 toward the workpiece 11 and a component that tries to move the vehicle body 1 forward parallel to the workpiece 11 are generated.

For this reason, the vehicle body 1 moves forward while bringing the track rollers 2 and 3 into contact with the material to be welded 11.

Therefore, since the torch supported by the vehicle body 1 is automatically moved along the welding line 12, automatic welding can be achieved. However, with such conventional equipment, the car body 1
When the vehicle body 1 is moved backward, the welding wheels 2 and 3 become separated from the workpiece 11 to be welded, so automatic welding cannot be performed while the vehicle body 1 is moved backward.

Therefore, when performing multi-layer welding, once one pass of welding is completed, the vehicle body 1 must be returned to its original position without any welding work, and then moved forward again to perform the next pass of welding. First, it had the disadvantage of very poor work efficiency. In addition, in the secondary welding torch transport vehicle, there were four wheels (6, 7, 8, 9) that came into contact with the running surface, so when the running surface (material to be welded 10) had large ridges, However, there was also a drawback in that the positional relationship between the welding line and the torch would change greatly if any one of the four wheels rose from the running surface.

The present invention was made in order to eliminate the above-mentioned conventional drawbacks, and can be made to run automatically along the welding line both when moving forward and when moving backward, and can significantly improve work efficiency.
Moreover, it is an object of the present invention to provide a welding torch transport vehicle in which the wheels do not float and the positional relationship between the welding line and the torch does not change greatly even if there is a large sag on the running surface.

Next, in order to facilitate understanding, the operating principle of the welding tote carrier according to the present invention will be first explained.

3 and 4 show the structure of a trolley that is the basis of the welding torch transport vehicle of the present invention, and the front and rear sections of one side of the vehicle body 13 are provided with a front profiling mechanism 14 and a rear profiling mechanism, respectively. A coil 15 is rotatably supported around a rotation axis perpendicular to the running surface (material 10 to be welded). Further, the vehicle body 1
An inner front wheel 16 and an inner rear wheel 17 are rotatably supported at the front and rear portions of the same side as the copying wheels 14 and 15 of No. 3, respectively. The rotation axes of these wheels 16 and 17 are perpendicular to a common tangent P to the follower wheels 14 and 15. An outer wheel 18 is rotatably supported on the other side of the vehicle body 13 and at an intermediate position between the inner front wheel 16 and the inner rear wheel 17 in the longitudinal direction. The axis of rotation of this outer wheel 18 is also perpendicular to the common tangent line P. Here, the inside front wheel 16 and the inside rear wheel 17 have the same diameter, while the outside wheel 18 has a larger diameter than the inside front wheel 16 and the inside rear wheel 17. Further, the three wheels 16, 17, and 18 are each driven at the same rotational speed by a drive device (not shown).

A welding torch (not shown) is supported on the vehicle body 13. As shown by the dashed line in FIG. 3, the tracing wheel 14,
15 are in contact with the material to be welded 11 (the materials to be welded 10 and 11 are the same as those shown in FIGS. 1 and 2), place this cart on the material to be welded 10, and place the cart on the material to be welded 10. When the three wheels 16, 17, and 18 are respectively driven in the forward direction by rearranging the drive, the outer wheel 18 has a larger diameter than the inner wheels 16, 17, so the vehicle body 13
It attempts to move forward while drawing a circle around the point ○, which is approximately located on the extension line Q of the rotation axis of 8. For this reason, the car body 1
3 is acted upon by a rotational moment M centered on point ◯ and a reaction force F acting from the workpiece 11 via the front tracing wheel 14 .

Therefore, the vehicle body 13 is in a state where the rotational moment M and the rotational moment due to the reaction force F are balanced, that is, as shown by the solid line, the tangent P is at an angle Q relative to the workpiece 11, and the rear tracing wheel 15 is attached to the workpiece 11. It becomes a state separated from one mountain and moves forward in that state. In exactly the same manner, when the three wheels 16, 17, 18 are driven in the backward direction by the drive device, only the rear side tracing section 15 of the vehicle body 13 moves toward the workpiece 11, as shown in FIG. , the front follower wheel 14 is separated from the workpiece 11, and the common tangent P makes an angle Q with respect to the workpiece 11, and the workpiece moves backward in this state.

As mentioned above, with this trolley, both when moving forward and when moving backward,
Since one of the tracing rods 14 and 15 is in contact with the material to be welded 11, the torch supported by the vehicle body 13 moves along the welding line 12 both when moving forward and when moving backward.

Therefore, welding can be performed both when moving forward and when moving backward. However, since the direction in which the vehicle body 13 approaches the material to be welded 11 is different when moving forward and when moving backward, there is an inconvenience that the distance between the welding line 12 and the torch must be readjusted when moving forward and when moving backward. arise. The welding torch carrier according to the present invention can solve the above-mentioned disadvantages, and its basic structure is shown in FIGS. 5 to 7.

In these figures, the vehicle body 13 has an inner front wheel 16 and an inner rear wheel 17, which are the same as in FIGS. 3 and 4.
and outer wheels 18 are provided in the same positional relationship, and these three wheels 16, 17, 18 are each driven by a drive device (not shown) provided on the vehicle body 13. A stopper wall 19 is provided on the vehicle body 13 in a direction perpendicular to the rotation axis of each wheel 16, 17, 18. Furthermore, the vehicle body 1
3, a torch support stand 20 is rotatably supported around a pivot 21 perpendicular to the running surface.

A front tracing wheel 14 and a rear tracing wheel 1 are provided at the front and rear portions of the inner wheels 6 and 17 side of the torch support base 20, respectively.
5 is rotatably supported around a rotation axis perpendicular to the running surface. Then, as shown in FIG. 5, from a state in which the stopper wall 19 is parallel to the common tangent line P to the copying wheels 14 and 15 (which corresponds to the welding tangent line 12 in FIGS. 5 to 7), , the car body 13 faces the two torch support stands clockwise and counterclockwise at an angle Q (this Q
(corresponds to Q in FIGS. 3 and 4), the side of the torch support base 20 opposite to the tracing wheels 14 and 15 is supported by the stopper wall 19.

As a result, the torch support base 2 can be rotated clockwise and counterclockwise from the state shown in FIG. 5 only within the range of the angle Q. In addition, a welding torch (not shown) such as a carbon dioxide welding machine is not attached to the vehicle body 13, but
It is supported by a torch support stand 20.

In this welding torch carrier, when the three wheels 1.6, 17, 18 are driven in the forward direction by the drive device with the profiling rollers 14, 15 in contact with the workpiece 11, the vehicle body 13 moves as described above. Similar to the case of the cart shown in FIGS. 4 and 5, the workpiece 11 to be welded is set at a certain angle as shown in FIG.

Then, the stopper wall 19 is brought into contact with the torch support stand 20, and the copying wheels 14, 15 are moved by the vehicle body 13 to the torch support stand 20.
0 to the welded material 11 side, the welded material 11 is pressed against the welded material 11. The vehicle body 13 then moves forward in this state.

In exactly the same way, the three wheels 16,
When 17 and 18 are reversely driven in the reverse direction, as shown in FIG. Material 1
Move backward while touching 1.

In this way, in the welding torch conveying truck of the present invention, both the following wheels 14 and 15 continue to be in contact with the workpiece 11 both when moving forward and when moving backward.
The torch, which is also supported by two torch support stands, is held at the same distance from the welding line 12 both when moving forward and when moving backward.

Therefore, there is no need to readjust the distance between the welding line 12 and the torch when moving forward and when moving backward. In addition, there are three wheels 16, 17, and 18 that contact the running surface.
Since the wheels always come into contact with the running surface at the same time, even if the running surface is sagging, one of the wheels will not lift up and the positional relationship between the welding line and the torch will not change significantly.

Next, embodiments of the present invention will be described with reference to FIGS. 8 to 16.

As clearly shown in FIG. 10, a front axle 24 and a rear axle 25 are supported rotatably and parallel to each other at the front and rear portions of the vehicle body 13 via bearings 22 and 23, respectively.

An inner front wheel 16 is fixed to one end of the front axle 24, and an inner rear wheel 17 is fixed to the rear axle 25, so that the inner wheels 16, 17 are attached to the vehicle body 13.
located on one side of the A worm storage box 26 is fixed to the other side of the vehicle body 13, and an outer axle 28 is rotatably attached to the worm storage box 26 and the vehicle body 13 via a bearing 27, and the front axle 24 and the rear It is supported parallel to the axle 25.

At one end of the outer axle 28, the outer wheel 18 is connected to the gear 2.
It is fixed together with 9. The outer wheel 18 is located on the other side, that is, on the side opposite to the inner wheels 16 and 17. Here, the inner front wheel 16 and the inner rear wheel 17 have the same diameter, while the outer wheel 18 has a larger diameter than the inner front wheel 16 and the inner rear wheel 17. The vehicle body 13 also has three wheels 16, 17,
A stop wall 19 perpendicular to 18 is provided. A motor stand 30 is installed in the worm storage box 26 in the front-rear direction (
It is mounted so that it can move freely in the direction B).

Here, as shown in FIG. 13, a sliding saddle is provided between the worm storage box 26 and the motor stand 30 so that the motor stand 30 can smoothly move relative to the worm storage box 26. A material 31 is interposed. As clearly shown in FIG. 14, a DC motor 32 is fixed to the motor stand 3.

The rotating shaft 32a of this DC motor 32 is connected to the motor stand 30'.
It is connected via a bearing 33 to a worm shaft 34 which is rotatable and supported in a direction perpendicular to the running surface. A worm 35 is fixed to the worm shaft 34. On the other hand, a worm gear 36 is fixed to the outer axle 28 . As shown in FIGS. 14 and 15, a pin 37 is attached to the worm storage box 26, and an intermediate portion of a lever 38 is rotatably supported on the pin 37. On the other hand, the motor stand 30'
A pin 39 is screwed onto this pin 39, and the tip of this pin 39 is fitted with four cam holes provided at the tip of the lever 38. The shape of the cam hole 40 is such that when the lever 38 is rotated to the position shown by the solid line in FIG. , the lever 38 is the fifteenth
When the motor base 30 is rotated to the position indicated by the two-dot chain line in the figure, the motor base 30 is pushed backward by the inner periphery of the cam hole 40 via the pin 39 and moves in the same direction, causing the worm 35 and the worm gear 36 to mesh with each other. It is shaped so that it can be removed.

As shown in FIG. 12, gears 41 and 42 rotatably supported by the vehicle body 13 are meshed with the gear 29 fixed to the outer axle 28 at the same time.

Further, a gear 43 fixed to the front axle 24 is meshed with the gear 41, and a gear 44 fixed to the rear axle 25 is meshed with the gear 42. Here, the gears 28, 43 and 44 have the same number of teeth. Further, the gears 41 and 42 also have the same number of teeth. As shown in FIG. 11, a magnet support shaft through hole 45 is provided in the center of the vehicle body 13, and a magnet support shaft 46 is passed through this hole 45 in a direction perpendicular to the running surface. There is.

A female threaded body 47 is screwed into the upper end of the magnet support shaft 46, and is mounted on the top surface of the vehicle body 13 via a washer 48 fitted to the magnet support shaft 46. . A stone mounting bolt 49 is passed through the magnet support shaft 46 in the direction of the marling line of the coaxial shaft 46 from the upper side of the vehicle body 13 to the lower side.

A magnet 50 is screwed onto the tip of the magnet mounting bolt 49 below the vehicle body 13. A spring 51 is interposed between the magnet 50 and the vehicle body 13, and this spring 51 biases the magnet 50 in a direction toward the running surface. The torch support base 20 is rotatably supported on the magnet support shaft 46 above the vehicle body 13 via a washer 48 .

A front tracing wheel 14 and a rear tracing wheel 15 are supported at the front and rear portions of the inner wheels 16 and 17 sides of this torch support base 20, respectively, so as to be rotatable about a rotation axis perpendicular to the running surface. has been done. Then, in exactly the same manner as in the case of FIGS. 5 to 7, the spreading range is regulated by the stopper wall 19, so that the torch support base 20 has the stopper wall 19 as shown in FIG. Rotate only within the range of angle Q (this Q corresponds to Q in Figures 3 and 4) in the clockwise and counterclockwise directions in the diagram from the state parallel to the common tangent P to 14 and 15. It is said to be free.

The torch support stand 201 has a torch support part 52 (eighth
A welding torch 53 such as a carbon dioxide gas welding machine is supported via a welding torch 53 (only shown in the figure).

The torch support portion 52 is configured such that the angle of the torch 53 with respect to the welding line 12 can be adjusted in various directions. Next, the operation of this embodiment will be explained.

When the lever 38 is in the solid line position in FIG. 15, the worm 35
and the worm gear 36 are in mesh with each other,
When the motor 32 is driven, the rotation of this motor 32 is
It is transmitted to the outer wheel 18 via the worm shaft 34, the worm 35, the worm gear 36, and the outer axle 28.

At the same time, the rotation of the motor 32 is transmitted from the outer axle 28 to the inner front wheel 16 via the gears 29, 41, 43 and the front axle 24, and also via the gears 29, 42 and the rear axle 25. The signal is transmitted to the inner rear wheel 17.
Therefore, the three wheels 16, 17, 18 are rotated in the same direction and at the same rotational speed.

Here, whether the three wheels 16, 17, 18 are rotated in the forward direction or in the reverse direction can be selected by switching the rotation direction of the motor 32. Since the configuration of this embodiment is in accordance with the basic configuration of the present invention shown in FIGS. 5 to 7, the same operations as those shown in FIGS. 5 to 7 are performed in this embodiment. As a result, welding can be performed both when moving forward and when moving backward, and the weld line 1 can be welded when moving forward and when moving backward.
There is no need to readjust the distance between 2 and the torch 53.

Further, in this embodiment, when transporting the vehicle body 13 to a predetermined welding start position, the lever 38 is moved to the first position.
By rotating the motor base 30 to the two-dot chain line position shown in Fig. 5 and moving the motor base 30 backward together with the motor 32 and the worm 35 to disengage the worm 35 and the worm gear 36, the vehicle body 13 can be quickly pushed by hand. can be moved to In addition, with the subordinate truck, the vehicle body could only be moved horizontally, so there was a drawback that welding could only be performed in the horizontal direction.

However, in this embodiment, since the magnet 50 is attached to the vehicle body 13, each wheel 16, 17, 18 is pressed against the welded material due to the magnetic force of the magnet 50 which attracts the welded material which becomes the running surface. Ru. Therefore, the vehicle body 13 can also run on the surface of the vertically erected workpiece, thereby making it possible to move the vehicle body 13 downward and upward during vertical welding. Furthermore, in this type of welding torch transport vehicle, it is necessary for the vehicle body to travel while dragging a heavy capter cord connected to the welding torch.

For this reason, conventionally, there has been a drawback that the vehicle body may roll due to the moment exerted by the heavy captire cord on the vehicle body. However, in this example,
Since the magnetic force of the magnet 50 exists, there is no risk of the vehicle body 13 falling over. Furthermore, in this type of welding torch transport vehicle, weaving welding is also possible if a swinging device for swinging the torch is provided in the torch support section.

In addition, by providing a tracing ring on the torch support and moving this tracing ring along the material to be welded, the torch can more accurately follow the welding line even if the material to be welded has large sag. can be done. However, in conventional trolleys of this kind, attaching the swing device or the following mechanism to the torch support part would make the torch support part heavy and there is a risk that the trolley would topple over, so it is not practical to attach them. could not.

However, if a magnet is attached to the vehicle body as in this embodiment, there is no risk of the truck falling over as described above, and it is also possible to attach the swinging device and the follower wheel to the welding torch support. In this embodiment, if the female screw body 47 is rotated in a predetermined direction, the magnet support shaft 4 will be rotated against the spring 51.
6 is pulled up together with the magnet 50. In addition, the female threaded body 4
If 7 is rotated in the opposite direction, the magnet support shaft 46 will be rotated in the opposite direction.
It descends together with the magnet 50 due to the force (and gravity) of 1.
Therefore, by performing such an operation, the size of the gap between the workpiece to be welded, which is the running surface, and the magnet 50, and the magnitude of the force with which the magnet 50 attracts the workpiece can be easily adjusted. be able to. Further, in this embodiment, the outer wheel 18 is made larger than the inner wheels 16 and 17, and
Although the three wheels 16, 17, and 18 are driven at the same rotational speed, the three wheels 16, 17, and 18 are made to have the same diameter, and the number of teeth of gears 43 and 44 is greater than the number of teeth of gear 29, for example. By doing so, even if the rotational speed of the outer wheel 18 is made higher than the rotational speed of the inner wheels 16 and 17, the same effect can be obtained.

In short, in the present invention, the peripheral speed of the outer periphery of the outer wheel may be greater than the peripheral speed of the outer periphery of the inner front wheel and the inner rear wheel. Further, in the above description, the case where fillet welding is performed is taken as an example, but according to the welding torch conveyance truck of the present invention, butt welding can also be performed.

That is, in this case, as shown in FIG. 16, the guide plate 56 is remounted on one of the welded materials 54 and 55 to be butt welded in parallel to the welding line 57, and the guide plate 56 is 14 and 15 are brought into contact with each other, and the welding torch 53 is directed toward the welding line 57. Furthermore, in the present invention, it goes without saying that the means for regulating the rotation range of the torch support is not limited to the stopper wall as in the embodiments described above.

As described above, according to the present invention, both when moving forward and when moving backward,
It can be driven by itself along the welding line, significantly improving work efficiency, and even if there is a large maneuver on the running surface, the wheels will lift up and the positional relationship between the welding line and the torch will change significantly. This provides the excellent effect of not having to do anything.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a plan view showing the basic structure of a conventional welding torch conveying cart, Fig. 2 is a rear view showing the basic structure of the conventional welding torch, and Figs. 3 and 4. 5 is a plan view showing the basic structure of the welding torch transport vehicle according to the present invention, FIGS. 5 to 7 are plan views showing the basic structure of the welding torch transport vehicle according to the present invention, and FIG. FIG. 9 is a plan view showing the embodiment, FIG. 10 is a bottom view showing the embodiment, and FIG.
1 is a sectional view taken along the phantom-X line in FIG. 10, FIG. 12 is a sectional view taken along the Kariichiyanagi line in FIG. FIG. 15 is a cross-sectional view taken along the line XW-XW, FIG. 15 is a cross-sectional view taken along the line XV-XV in FIG. 14, and FIG. 16 is a rear view showing the state when butt welding is performed according to the embodiment. 10, 11... Material to be welded, 12... Welding line, 13... Car body, 14... Front copying wheel, 15... Rear copying wheel, 16...Inner front wheel, 17...Inner rear wheel, 18...Outer wheel, 19...Stopper wall, 20...Torch support Base, 29... Gear, 32... DC motor, 35... Worm, 36... Worm gear, 4
1-44...Gear, 50...Magnet, 5
2...Torch support part, 53...Welding torch, 56...Guide plate. Figure 16 Figure 1 Figure 2 Figure 5 Figure 3 Figure 4 Figure 6 Figure 7 Figure 8 Figure 10 Figure 9 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15

Claims (1)

[Scope of Claims] 1. A vehicle body, an inner front wheel and an inner rear wheel provided at the front and rear portions of one side of the vehicle body, respectively, and the inner side wheels provided on the other side of the vehicle body in the longitudinal direction. an outer wheel provided at an intermediate position between the front wheel and the inner rear wheel, such that the circumferential speed of the outer periphery of the outer wheel is greater than the circumferential speed of the outer periphery of the inner front wheel and the inner rear wheel;
a drive device that drives each of the wheels in a forward direction and a backward direction; a torch support supported on the vehicle body so as to be rotatable within a certain range around a rotation axis perpendicular to the running surface; a front side tracing wheel and a rear side tracing wheel each rotatably supported by a torch support base and whose outer periphery is in contact with a surface non-parallel to the running surface and along the welding line, and provided on the torch support base, A welding torch conveying truck comprising a torch support part that supports a welding torch. 2. The welding torch transport vehicle according to claim 1, wherein a magnet is attached to the vehicle body so as to face the running surface.