JP2016059949A - Automated travel mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automated travel mechanism capable of preventing the breaking of a signal line caused by bending of a control cable connected to an autonomous travel device in a portion near a connector.SOLUTION: An automated travel mechanism comprises: an autonomous travel device that moves while being guided by a rail; a control unit that controls the autonomous travel device to operate; a control cable connecting the autonomous travel device to the control unit; and a cable hanger movably attached to the rail and supporting the control cable. A distance adjustment material may be provided between the autonomous travel device and the cable hanger so as to keep a distance therebetween to be not longer than a preset distance.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an automatic travel mechanism.

  In recent years, self-propelled (movable) automatic devices have been used in various industrial fields. For example, in the construction of a low-temperature tank, when forming the side wall, after assembling the rectangular face material (membrane) in order from the top, the joints between the face materials are welded using an automatic welding machine. ing. Some large tanks have a height of 40 to 50 meters, and there are also narrow places. Automatic welding machines that enable welding work in such high places and narrow places are manually welded. There are many advantages compared to work and it is widely used.

  The automatic welding machine is usually configured to include an automatic welding apparatus (welding machine main body), a control apparatus, and a control cable, and the automatic welding apparatus is preliminarily arranged with respect to the control apparatus arranged and fixed on the floor surface or the like. It runs on the installed rails. The control cable is detachably connected to the automatic welding apparatus by a connector, thereby connecting between the control apparatus and the automatic welding apparatus and transmitting a control signal from the control apparatus to the automatic welding apparatus. Based on such a configuration, the operation of the automatic welding apparatus is controlled by the control device.

  Incidentally, the automatic welding apparatus is basically designed to run in the vertical direction along the rails installed in the vertical direction (vertical direction) and perform automatic welding. The control cable is attached to the lower surface of the automatic welding apparatus, that is, the surface facing downward in the vertical direction. Thereby, since the cable part connected to a connector hangs down below, a big bending force does not act between a connector and the cable part connected to this. Therefore, there is almost no load due to bending between the connector and the cable part, and as a result, a large bending force does not act on the signal wiring inside these connectors and control cables, so that the signal wiring is not broken. ing.

  In addition, what was disclosed by the following patent document 1 is known as a cable handling apparatus of an automatic welder.

JP-A-9-41708

  However, when the automatic welding apparatus is used in a usage method different from the original usage method, specifically, along the rail installed in the horizontal direction (left-right direction) instead of running in the vertical direction. When automatic welding is performed while running in the horizontal direction, the control cable connector is attached to the automatic welding device in the horizontal direction (horizontal direction), so that the cable part immediately follows the horizontal direction (horizontal direction) from this connector. Hangs down. Therefore, when a large bending force acts between the connector and the cable portion connected to the connector, the signal wiring inside the control cable may be disconnected.

  That is, for example, in the case of a large tank having a height of about 40 to 50 meters, the length of the control cable is more than 40 to 50 meters, and therefore, the control cable is considerably heavy. Therefore, if bending occurs between the connector and the cable part and the weight of the cable part is applied to this bent part, a large load is applied to the bent part, which causes a large bending force on the signal wiring inside the connector and the control cable. May cause disconnection in the signal wiring. About 30 to 40 signal wires are provided in the control cable, but each signal wire corresponds to each signal, so if even one wire is disconnected, the operation of the automatic welding device will be hindered. End up.

  In addition, although the cable handling apparatus of the automatic welding machine of patent document 1 describes problems, such as a cable getting entangled, it does not describe about the disconnection of the signal wiring in a control cable.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an automatic traveling mechanism that prevents disconnection of signal wiring due to bending of a control cable connected to the automatic traveling device in the vicinity of the connector. There is to do.

  The automatic travel mechanism of the present invention includes an automatic travel device that is guided by a rail and moves, a control device that controls the operation of the automatic travel device, a control cable that connects the automatic travel device and the control device, And a cable hanger that is movably attached to the rail and supports the control cable.

  Further, in the automatic travel mechanism, the rail includes a rail body for rotating the wheels of the automatic travel device, and a gear meshing with the wheels for automatically traveling the automatic travel device. It is preferable that the cable hanger has a pulley that rotates on the rail body without being interfered with the gear.

  Moreover, in the automatic traveling mechanism, it is preferable that an interval adjusting material is provided between the automatic traveling device and the cable hanger for maintaining the interval between them at a predetermined distance or more. .

  According to the automatic travel mechanism of the present invention, since the automatic travel device is movably attached to the moving rail and is provided with the cable hanger that supports the control cable, the automatic travel device is different from the original method of use. Even if the cable part of the control cable tends to bend easily with respect to the connector, the cable part of the control cable is supported near the connector by supporting the cable part of the control cable with the cable hanger. It can be prevented from bending. Therefore, disconnection of the signal wiring due to bending near the connector can be prevented.

It is a figure which shows an example of the low temperature tank used for construction by the automatic welding mechanism (automatic travel mechanism) of this embodiment, (a) is sectional drawing of a low temperature tank, (b) is the A section enlarged view of (a). is there. (A), (b) is a usage-form explanatory drawing of an automatic welding apparatus. It is principal part sectional drawing for demonstrating a rail and the running means of an automatic welding apparatus. It is a schematic block diagram of the automatic welding mechanism of this embodiment. It is a figure which shows schematic structure of a cable hanger, (a) is a side view, (b) is a rear view. It is a schematic block diagram of a supporting member.

Hereinafter, embodiments of an automatic travel mechanism of the present invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size.
This embodiment demonstrates the case where the automatic traveling mechanism which concerns on this invention is applied to the automatic welding mechanism used for construction of a low temperature tank. First, the structure of a low-temperature tank such as an LNG tank in which the automatic welding mechanism (automatic traveling mechanism) of this embodiment is used will be described.

  FIG. 1 is a diagram showing an example of a membrane type cryogenic tank in which the automatic welding mechanism of the present embodiment is used for construction, (a) is a cross-sectional view of the cryogenic tank, and (b) is an enlarged view of part A of (a). FIG. In this membrane type low temperature tank, as shown in FIG. 1 (a), a concrete casing 2 is constructed inside a hole excavated in the ground 1, and a cold insulator 3 or the like serving as a base material is provided on the inner surface of the casing 2. A rectangular membrane 4 formed of a thin metal plate having a thickness of about 2 mm, such as stainless steel, is attached to form an inner tank of an airtight structure, and the upper part thereof is covered with a roof 5 to form a sealed structure. .

  In the membrane 4 of such a low temperature tank, as shown in FIG. 1 (b) showing the inner surface of the side of the low temperature tank, the pleats 6 (corrugation) are vertically (upper and lower) so as to cope with heat shrinkage due to storage of the low temperature liquid. ) · Horizontal (left and right) are formed at regular intervals, and a cross-shaped pleat 7 (corrugation) is formed at a portion where the vertical (top and bottom) fold and the horizontal (left and right) fold intersect. As the membrane 4, the shape of the pleats is not limited to that shown in FIG. 1B, and various shapes can be used. For example, there are no cross-shaped pleats 7 and there are only vertical (up and down) and horizontal (left and right) pleats 6, or even those with only vertical (up and down) or horizontal (left and right) pleats 6. is there.

  As shown in FIG. 1 (a), the membrane 4 is attached to the casing 2 in advance by placing the cold insulation material 3 on the enclosure 2 and arranging the refractory material 8 on the cold insulation material 3. The membrane 4 is placed on 8. Then, when the membrane 4 is arranged and fixed on the refractory material 8 in this way, the next membrane 4, that is, the membrane 4 located adjacent thereto, is fixed in the same manner. At that time, as shown in FIG. 1 (b), the membrane 4 is aligned so that the upper and lower, left and right pleats 6 are continuous with the pleats 6 of the adjacent membrane 4, and a part thereof is overlapped with each other. Deploy.

  By sequentially aligning the membranes 4 in this way and arranging them vertically and horizontally while superposing a part thereof, the overlapping portions (joint portions) of each other, that is, the weld lines 12 serving as welding locations are formed vertically and horizontally. The Therefore, in order to weld along such a weld line 12 with an automatic welding device, as shown by a two-dot chain line in FIG. A rail 13 is attached, and the membrane 4 and the membrane 4 are continuously welded along the weld line 12 while running an automatic welding apparatus on the rail 13.

  As shown in FIG. 2A, an automatic welding apparatus 20 (automatic traveling apparatus) used for such welding includes traveling means (not shown) for traveling (moving) on the rail 13, welding portions 21. As shown in FIG. 3, the rail 13 has rail main bodies 14 at both ends in the width direction. The rail body 14 is formed in a substantially octagonal shape when viewed in cross section, and the wheels 20a constituting the traveling means of the automatic welding apparatus 20 are rotated on the slopes 14b and 14b located on both sides of the outer surface 14a. It has become.

  Further, one rail body 14 is provided with a rack-like gear 14c on the outer side surface 14a along the length direction of the rail 13, and the traveling gear 20b of the automatic welding apparatus 20 meshes with the gear 14c. ing. The traveling gear 20b is provided on the wheel 20a and constitutes a part of the wheel 20a. Based on such a configuration, the automatic welding apparatus 20 travels on the rack-shaped gear 14c when the travel gear 20b of the travel means rotates by driving a motor (not shown). That is, the automatic welding apparatus 20 travels on the rail 13 by the travel means.

  As shown in FIG. 2 (a), the welding portion 21 includes a torch portion 21a, a welding wire feeder 21b, and an automatic adjustment portion 21c, and the welding wire 21d supplied by the welding wire feeder 21b is replaced with the torch. The part 21a is heated and melted to perform welding. The automatic adjustment portion 21c moves the torch portion 21a in a direction orthogonal to the rail 13 in order to displace the position of the welding portion of the torch portion 21a, that is, the tip portion of the torch (not shown) and match the weld line 12. It is.

  As shown in FIG. 2 (a), the automatic welding device 20 has a lower surface, that is, a surface facing downward when traveling in the vertical direction along the rail 13 provided in the vertical direction (vertical direction). A control cable 22 is connected. In addition to the control cable 22, a cable 24 that houses a power line, piping for cooling water, gas, and the like is also connected. In FIG. 2A, only one cable 24 is shown in addition to the control cable 22, but actually, a plurality of power lines, pipes, and the like are provided. Is provided.

  The control cable 22 includes a connector 22a and a cable portion 22b connected to the connector 22a. The control cable 22 accommodates a large number of signal wires, for example, about 30 to 40 signal wires, and is connected to the automatic welding apparatus 20 by the connector 22a. It is detachably connected. With such a configuration, the control cable 22 connects the automatic welding apparatus 20 and the control apparatus 23 and transmits a control signal from the control apparatus 23 to the automatic welding apparatus 20 through signal wiring. The control cable 22 is also detachably connected to the control device 23 by a connector 22a. Further, since the control device 23 is usually installed on the floor surface, when the tank is a large tank having a height of 40 to 50 meters, for example, the length of the control cable 22 exceeds 40 to 50 meters. Due to this, it is quite heavy.

  Here, as shown in FIG. 2A, when the automatic welding apparatus 20 is moved along the vertical direction, which is the original method of use, and automatic welding is performed, the control cable 22 is automatically connected to the connector 22a. Since it is attached facing downward on the lower surface of the welding device 20, the cable portion 22b hangs downward along the direction of the connector 22a. Therefore, a load due to bending is hardly applied between the connector 22a and the cable portion 22b, and a large bending force does not act on the internal signal wiring.

  However, as shown in FIG. 1 (b), the overlapping portion (joint portion) of the membrane 4 is formed vertically and horizontally, and therefore the weld line 12 serving as a welding location is also formed vertically and horizontally. As shown in b), it is necessary to perform automatic welding while moving the automatic welding apparatus 20 in the horizontal direction (left-right direction) which is a method of use different from the original method of use. That is, it is necessary to perform automatic welding while moving the automatic welding apparatus 20 along the rail 13 installed in the horizontal direction.

  However, when the automatic welding apparatus 20 is moved in the horizontal direction as described above, the cable portion 22b of the control cable 22 hangs down immediately after moving in the horizontal direction (horizontal direction) from the connector 22a as described above. A large bending force acts between the cable portion 22b and the cable portion 22b, and disconnection may occur in the signal wiring inside the connector 22a and the cable portion 22b.

  A large bending force is also applied to the cable 24 provided separately from the control cable 22, but cables such as power lines and pipes are formed thick, and a twisted line is used as the power line. The problem as in the case of the control cable 22 hardly occurs.

  Therefore, when the automatic welding apparatus 20 is used while being moved in the horizontal direction different from the original usage method, in this embodiment, control is performed as shown in FIG. 4 in order to prevent disconnection of the signal wiring in the control cable 22. A cable hanger 30 that supports the cable 22 is provided. The cable hanger 30 is movably attached to the rail 13 together with the automatic welding device 20 and supports the control cable 22 and the cable 24. Here, the automatic welding mechanism (automatic travel mechanism) of this embodiment is comprised by providing such a cable hanger 30, the automatic welding apparatus 20, and the control cable 22. FIG.

  5A and 5B are diagrams showing a schematic configuration of the cable hanger, FIG. 5A is a side view, and FIG. 5B is a rear view. As shown in FIGS. 5A and 5B, the cable hanger 30 includes a rectangular plate-shaped hanger body 31, pulleys 32 provided at the four corners of the hanger body 31, and a support provided on the hanger body 31. 33 and the gripping tool 34.

  The hanger body 31 is provided with an opening 31a through which a rope or the like can be passed. In addition, an adjustment plate 35 is attached to the hanger body 31 so as to be movable in the vertical direction with respect to the hanger body 31. The adjustment plate 35 has a lower end surface supported by the adjustment bolt 36 so that the height relative to the hanger body 31 can be adjusted, and a pair of mounting bolts 37 on the upper side as shown in FIG. The hanger body 31 is fixed by mounting bolts 37.

  The hanger body 31 is formed with a pair of long holes 31b and 31b long in the vertical direction below the opening 31a, and the mounting bolt 37 is movably mounted in the long hole 31b. Not fastened to the nut. The adjustment bolt 36 is screwed into a screw hole (not shown) of a bent plate 31c provided at the lower end portion of the hanger body 31 and attached thereto, and the tip (upper end) thereof is the adjustment plate. The lower end surface of 35 is supported. Thereby, the height of the adjusting plate 35 relative to the hanger body 31 can be adjusted by appropriately changing the amount of protrusion of the adjusting bolt 36 from the bent plate 31c. A nut 36a is screwed onto the adjustment bolt 36 to prevent loosening.

  Two pulleys 32 are attached to the upper side on the back side of the hanger body 31, and two pulleys 32 are attached to the adjustment plate 35. As shown in FIG. 5A, these pulleys 32 are rotatably attached to the hanger body 31 and the adjustment plate 35 via a shaft 32a. Moreover, the pulley 32 has the wheel part 32b on both sides, and has the structure which has the recessed part 32c between these wheel parts 32b and the wheel parts 32b. With such a configuration, the pair of wheel portions 32 b and the wheel portions 32 b are in contact with the inclined surface 14 b of the rail body of the rail 13 so as to be rotatable. Further, since the recess 32c is provided between the wheel portion 32b and the wheel portion 32b, it does not interfere with the rack-like gear 14c provided on the rail body 14. Therefore, the pulley 32 rotates on the rail body 14 without being interfered by the gear 14c.

  Here, the cable hanger 30 is detachable from the rail 13. That is, when attaching to the rail 13, the adjusting plate 35 is loosened with respect to the hanger body 31 by loosening the mounting bolt 37 and the mounting bolt 37 of the adjusting plate 35 and lowering the upper end surface by loosening the adjusting bolt 36. Lower. In this state, the upper pulley 32 is engaged with the upper rail body 14 of the rail 13, and the lower pulley 32 is opposed to the lower rail body 14 of the rail 13. Next, the adjustment plate 35 is lifted in this state, and the lower pulley 32 is engaged with the lower rail body 14. Thereafter, the adjustment bolt 36 is tightened to raise the upper end surface thereof, thereby raising the adjustment plate 35 and supporting the lower end surface thereof. In this state, the mounting bolt 37 and the mounting bolt 37 are tightened to fix the adjustment plate 35 to the hanger body 31. Thereby, the cable hanger 30 can be attached to the rail 13.

  Further, when removing from the rail 13, the adjusting plate 35 is loosened with respect to the hanger body 31 by loosening the mounting bolt 37 and mounting bolt 37 of the adjusting plate 35 and lowering the upper end surface by loosening the adjusting bolt 36. Lower. Then, since the two pulleys 32 attached to the adjustment plate 35 are detached from the rail body 14, the upper pulley 32 can be removed from the upper rail body 14 by lifting the hanger body 31 in this state. Therefore, the cable hanger 30 can be removed from the rail 13 by removing all the pulleys 32 from the rail body 14 of the rail 13.

  In this embodiment, the support tool 33 is formed of an L-shaped metal rod. The L-shaped support 33 is attached in a state of protruding to the front side of the hanger body 31 as shown in FIG. 5 (a), and in front of the opening 31a as shown in FIG. 5 (b). Is arranged. Under such a configuration, the support 33 is configured to hook the cable portion 22b of the control cable 22 and the cable portion of the cable 24 and support them in this state as shown in FIG.

  Moreover, as shown to Fig.5 (a), the holding rod 38 is attached to the upper end part to the support tool 33 so that rotation is possible. As shown by a two-dot chain line in FIG. 5A, the holding bar 38 supports the cable portion 22 b and the cable 24 with the support tool 33, and then rotates to the hanger body 31 side to open the support tool 33. By closing the side, the cable portion 22b and the cable 24 are prevented from unexpectedly coming off the support tool 33 and falling off. Note that a known locking mechanism is provided between the holding bar 38 and the support member 33, and while the cable portion 22 b and the cable 24 are supported by the support tool 33, the holding bar 38 is moved outward by the lock mechanism. It is preferable to prevent the opening side of the support 33 from being opened.

  The gripping tool 34 is a U-shaped metal rod attached to the adjustment plate 35 as shown in FIG. 5B, and both ends thereof are attached to the adjustment plate 35. The adjustment plate 35 is disposed so as to protrude below the adjustment plate 35. With such a configuration, when the cable hanger 30 is attached to and detached from the rail 13 as described above, the adjustment plate 35 can be easily raised and lowered by holding the holding tool 34. For example, when the automatic welding apparatus 20 is manually moved in a direction opposite to the self-running direction, the cable hanger 30 needs to be manually moved with respect to the rail 13. The cable hanger 30 can be easily traveled by gripping.

  Further, in the present embodiment, as shown in FIG. 4, an interval adjusting member 39 is provided between the automatic welding apparatus 20 and the cable hanger 30 to maintain an interval between them at a predetermined distance or more. ing. The interval adjusting member 39 is formed of, for example, a plurality of metal pipes, and is inserted into the first metal pipe movably inserted into the first metal pipe formed in a length equal to a preset distance. Alternatively, it is formed with a second metal pipe to be extrapolated. Thus, the space | interval adjustment material 39 can be expanded-contracted by inserting or extrapolating a 2nd metal pipe with respect to a 1st metal pipe, Therefore Therefore, it is between the automatic welding apparatus 20 and the cable hanger 30. By being attached to, the space between them is maintained to be longer than the length of the first metal pipe.

  That is, when the distance adjusting material 39 tries to approach the automatic welding apparatus 20 beyond the distance set by the cable hanger 30, the second metal pipe is inserted or extrapolated into the first metal pipe and is entirely Even if it shrinks, it will be maintained more than the length of the first metal pipe, and therefore the distance between the automatic welding apparatus 20 and the cable hanger 30 will be maintained more than the length of the first metal pipe.

  In order to perform automatic welding along the horizontal (lateral) welding line 12 while moving in the horizontal direction by the automatic welding mechanism having such a configuration, it is movably attached to the rail 13 as shown in FIG. A cable hanger 30 is arranged behind the automatic welding apparatus 20 in the moving direction and attached to the rail 13. And by attaching the space | interval adjustment material 39 between the automatic welding apparatus 20 and the cable hanger 30, the space | interval between these is maintained more than fixed.

  Subsequently, the cable portion 22b of the control cable 22 of the automatic welding apparatus 20 and the cable portion of the cable 24 are hooked on and supported by the support 33 of the cable hanger 30, and in this state, the holding rod 38 is rotated to drop off. To prevent. In this way, the cable portion 22b of the control cable 22 and the cable portion of the cable 24 are supported by the support 33 of the cable hanger 30, so that the cable portion 22b of the control cable 22 can be easily bent with respect to the connector 22a. Even if it is going to be brazed, by supporting the cable part 22b of the control cable 22 with the cable hanger 30, it is possible to prevent the cable part 22b of the control cable 22 from being bent in the vicinity of the connector 22a.

  Therefore, in the automatic welding mechanism of the present embodiment, disconnection of the signal wiring due to bending of the control cable 22 connected to the automatic welding apparatus 20 in the vicinity of the connector 22a can be prevented. The cable portion 22b of the control cable 22 bends at a place hooked on the support 33, and then hangs downward. However, unlike the vicinity of the connector 22a, that is, the connection portion with the connector 22a, the cable portion 22b gradually bends with a relatively small curvature at a position away from the connector 22a, so that a load due to a large bending force is not applied. Disconnection of signal wiring is prevented.

  Further, when the automatic welding apparatus 20 is run on the rail 13, the cable hanger 30 can be pulled by the control cable 22 or the cable 24, and thereby the cable hanger 30 can be made to follow the automatic welding apparatus 20. At that time, the pulley 32 of the cable hanger 30 rotates on the rail body 14 without being interfered with the gear 14 c of the rail body 14, so that the rail 13 is pulled by being pulled by the automatic welding device 20. Run smoothly on top.

  Since there are actually a plurality of cables 24 and the like, when these cables 24 and control cable 22 are hooked on the support tool 33, the cable 24 can hardly be easily removed from between the support tool 33 and the hanger body 31, and therefore automatic By running the welding device 20, the cable hanger 30 can be pulled by the control cable 22 or the cable 24. However, in order to more reliably prevent the cable 24 and the control cable 22 from coming off between the support 33 and the hanger body 31 when the cable 24 and the control cable 22 are pulled, the cable 24 and the control cable 22 are tied with a rope, for example. The cable 24 and the control cable 22 may be fixed to the cable hanger 30 by passing a rope through the opening 31a.

  Moreover, since the space | interval adjustment material 39 is attached between the automatic welding apparatus 20 and the cable hanger 30, the space | interval between these can be maintained more than the preset distance. Accordingly, the cable hanger 30 is close to the automatic welding apparatus 20 and the space between the automatic welding apparatus 20 and the cable hanger 30 becomes extremely narrow, so that the bent portion of the cable portion 22b at the support 33 approaches the connector 22a. By doing so, it is possible to prevent the curvature of the bent portion of the cable portion 22b from increasing. Therefore, disconnection of the signal wiring in the control cable 22 can be reliably prevented.

  Further, when the cable 24 and the control cable 22 are pulled by the automatic traveling of the automatic welding device 20, even if they are pulled out between the support tool 33 and the hanger body 31, the automatic welding device 20 and the cable are connected by the gap adjusting member 39. Since a certain distance can be maintained between the hanger 30, the cable hanger 30 can be made to follow the automatic welding apparatus 20 reliably.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.
For example, in the above-described embodiment, the support tool 33 made of an L-shaped metal rod is used as a configuration for supporting the control cable 22. Without limitation, various configurations can be employed. FIG. 6 is a view showing another example of a configuration for supporting the control cable 22, and reference numeral 40 in FIG. 6 denotes a support member.

  The support member 40 includes a hook 41 connected to the gripping tool 34 of the cable hanger 30 and a ring-shaped support ring 42 connected to the lower end of the hook 41. In the support member 40, the control cable 22 and the cable 24 can be supported by passing the cable portion 22 b of the control cable 22 and the cable portion of the cable 24 through the support ring 42. Therefore, even in the cable hanger provided with such a support member 40, it is possible to prevent disconnection of the signal wiring due to bending of the control cable 22 in the vicinity of the connector 22a.

Moreover, although the said embodiment demonstrated the case where the automatic traveling mechanism of this invention was applied to the construction of the membrane-type low temperature tank which is an underground tank, of course, it can apply also to the construction of a ground tank. Specifically, the automatic traveling mechanism of the present invention can be used for welding the side plates that form the wall surface of the ground tank.
Moreover, although the case where the automatic traveling mechanism of the present invention is applied to the automatic welding mechanism has been described in the above-described embodiment, the present invention is not limited to this. It can also be applied to an automatic traveling mechanism.

DESCRIPTION OF SYMBOLS 13 ... Rail, 14 ... Rail main body, 14c ... Gear, 20 ... Automatic welding apparatus (automatic traveling apparatus), 20a ... Wheel, 20b ... Traveling gear, 22 ... Control cable, 22a ... Connector, 22b ... Cable part, 23 ... Control Device, 30 ... Cable hanger, 32 ... Pulley, 32b ... Wheel portion, 32c ... Recess, 33 ... Support, 39 ... Spacing adjustment material, 40 ... Support member

Claims (3)

An automatic traveling device that is guided by a rail and moves,
A control device for controlling the operation of the automatic traveling device;
A control cable connecting the automatic travel device and the control device;
An automatic traveling mechanism comprising: a cable hanger that is movably attached to the rail and supports the control cable. The rail includes a rail body for rotating the wheels of the automatic travel device, and a gear for automatically traveling the automatic travel device by meshing with the wheels,
The automatic traveling mechanism according to claim 1, wherein the cable hanger includes a pulley that rotates on the rail body without being interfered with the gear. The distance adjusting material for maintaining the space | interval between these more than the preset distance between the said automatic traveling apparatus and the said cable hanger is provided. Automatic traveling mechanism.

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