JP3619365B2 - Welding torch maintenance device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention travels through existing pipes such as gas pipes, water pipes, and ground plant pipes buried in the ground, and is used for repair welding of weld defects occurring on the inner peripheral surface of the existing pipes. The present invention relates to a welding torch maintenance device for cleaning a welding torch and cutting a welding wire inserted through a tip of the welding torch.
[0002]
[Prior art]
Generally, steel pipes used for piping such as gas pipes buried in the ground are manufactured with a pipe length of a certain standard, and joints at both ends thereof are joined together by a technique such as butting and welding. These plant pipes and the like are connected by the same method.
In joints on the inner peripheral surface of existing pipes connected by such a method, there may be places where repair welding is required due to insufficient penetration due to insufficient initial welding. As a device provided for the above, a series of working carriage groups A for connecting welding carriages W as shown in FIG. 6 are run inside the existing piping P, and welding processing for so-called poorly welded portions WP requiring repair welding is performed. Has been done.
[0003]
The welding carriage W is a vehicle that performs repair welding on the found defective welding point WP. Hereinafter, repair welding to the inner peripheral surface of the existing pipe P by the welding carriage W will be briefly described.
[0004]
As shown in FIG. 6, a series of work carriage groups A are run inside the existing pipes P to inspect the inner peripheral surface of the pipes. The control of the work carriage groups A is controlled by a control vehicle V arranged on the ground. Is done by.
A monitoring device M is disposed inside the control vehicle V, and the inner peripheral surface of the pipe captured by the television camera TV1 mounted on the traveling vehicle A1 arranged at the head part of the work vehicle group A is disposed on the monitoring device M. Is projected. Then, when the worker who is monitoring the monitoring device M finds a welding failure location WP, the polishing cart A2 connected to the traveling carriage A1 is advanced to the welding failure location WP.
Then, prior to the repair welding, the polishing cart A2 polishes the weld failure portion WP, and then the repair welding is performed by the welding device of the welding cart W.
[0005]
[Problems to be solved by the invention]
By the way, in the repair welding to the welding failure location WP on the inner peripheral surface of the existing pipe P by such a welding carriage W, in addition to the fact that the welding work environment is the inside of the existing pipe, the distance of the pipe is long. Therefore, the maintenance inspection of the welding torch cannot be performed in the same manner as the work on the ground, and therefore, there has been a problem that sufficient repair welding to a poorly welded portion cannot be performed.
That is, when the following problems occur, at present, a series of work carriages A are run to the opening of the existing piping, and repairs and maintenance inspections of inconvenient portions of the welding apparatus are performed.
The welding work environment is the environment inside the existing pipe P. Spatter and welding fumes generated during welding work accumulate in the gap between the nozzle and tip of the welding torch, and this deposition deteriorates the passage of the shielding gas and welds. Efficiency is reduced.
After the welding operation, a so-called “tube”, which is a mass of the welding wire, is generated at the tip of the welding wire protruding from the tip. And the surface of this rib is covered with an oxide film, slag, etc., so that the re-arc start becomes worse and the welding efficiency is lowered.
[0006]
Therefore, the purpose of the maintenance device for a welding torch according to the present invention is to make up for the drawbacks of conventional welding operations,
Even inside the existing pipe P, it is possible to improve the welding efficiency by cleaning the nozzle of the welding torch and cutting the welding wire protruding from the tip to an appropriate length if necessary. It is to provide a maintenance device for a welding torch.
[0007]
[Means for Solving the Problems]
In order to solve such a problem, the first feature of the maintenance device for a welding torch according to the present invention is:
A welding carriage equipped with a welding torch that runs inside existing pipes such as gas pipes, water pipes and ground plant pipes buried in the ground, and is used for repair welding of defective welds on the inner peripheral surface of the existing pipes An X-axis movement mechanism that allows the welding torch to reciprocate in the pipe axis direction of the existing pipe, and a Z-axis movement mechanism that enables the welding torch to reciprocate in the pipe diameter direction of the existing pipe. In a welding cart comprising:
A welding torch rotating mechanism that is mounted on a bracket member of the Z-axis moving mechanism and that has a nozzle and is capable of rotating in the tube axis direction from the pipe radial direction of the existing pipe;
A welding torch cleaning mechanism for cleaning the tip of the nozzle of the welding torch rotated in parallel with the pipe axis of the existing pipe by the welding torch rotating mechanism and moved forward by the X-axis moving mechanism; The configuration to be used is a means for solving the problem.
[0008]
The second feature is:
A welding carriage equipped with a welding torch that runs inside existing pipes such as gas pipes, water pipes and ground plant pipes buried in the ground, and is used for repair welding of defective welds on the inner peripheral surface of the existing pipes An X-axis movement mechanism that allows the welding torch to reciprocate in the pipe axis direction of the existing pipe, and a Z-axis movement mechanism that enables the welding torch to reciprocate in the pipe diameter direction of the existing pipe. In a welding cart comprising:
A welding torch rotating mechanism that is mounted on a bracket member of the Z-axis moving mechanism and that has a nozzle and is capable of rotating in the tube axis direction from the pipe radial direction of the existing pipe;
Welding that is rotated in parallel with the pipe axis of the existing pipe by the welding torch rotating mechanism, moves forward by the X-axis moving mechanism, and cuts the welding wire inserted through the tip of the welding torch into a predetermined length And a wire cutting mechanism.
[0009]
And the third feature is that
A welding carriage equipped with a welding torch that runs inside existing pipes such as gas pipes, water pipes and ground plant pipes buried in the ground, and is used for repair welding of defective welds on the inner peripheral surface of the existing pipes An X-axis movement mechanism that allows the welding torch to reciprocate in the pipe axis direction of the existing pipe, and a Z-axis movement mechanism that enables the welding torch to reciprocate in the pipe diameter direction of the existing pipe. In a welding cart comprising:
A welding torch rotating mechanism that is mounted on a bracket member of the Z-axis moving mechanism and that has a nozzle and is capable of rotating in the tube axis direction from the pipe radial direction of the existing pipe;
A welding torch cleaning mechanism for cleaning the tip of the nozzle of the welding torch that is rotated in parallel with the pipe axis of the existing pipe by the welding torch rotating mechanism and moved forward by the X-axis moving mechanism;
Welding that is rotated in parallel with the pipe axis of the existing pipe by the welding torch rotating mechanism, moves forward by the X-axis moving mechanism, and cuts the welding wire inserted through the tip of the welding torch into a predetermined length And a wire cutting mechanism.
[0010]
The welding torch rotating mechanism is attached to a bracket member of the Z-axis moving mechanism, and a torch rotating base member for mounting a welding torch rotatably supported by a rotating shaft; and the torch rotation It is good also as a mechanism which consists of a rotation link mechanism which consists of a rotation link member which is built in the movement base member, and is axially mounted on the rotation shaft and engages one end with the tip of the cylinder rod of the cylinder unit. .
[0011]
Furthermore, the welding torch cleaning mechanism is housed in a gear case mounted on the main body of the welding carriage via a base member, and is rotated on the tube axis of the existing pipe by the welding torch rotating mechanism to move the X axis. A mechanism comprising a scraper that can be inserted into a gap portion of a welding torch that has been moved forward by the mechanism, and that is rotated by the operation of a gear mechanism, and a discharge mechanism that is attached to the scraper and blows compressed air onto the scraper portion. It is good.
[0012]
The welding wire cutting mechanism is housed in a cutter case mounted on the main body of the welding carriage via a base member, rotated by the welding torch rotating mechanism in the pipe axis direction of the existing pipe, and the X axis A welding torch moved forward by a moving mechanism and further moved upward in the pipe radial direction by the Z-axis moving mechanism, a cutter member capable of inserting a welding wire inserted through a tip of the welding torch;
As a mechanism comprising a movable arm that is pivotally mounted on the cutter member, has a blade portion, and has one end pivotally attached to the tip of a cylinder rod of the cylinder unit. Good.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a maintenance device for a welding torch according to the present invention will be described below with reference to the accompanying drawings.
[0014]
FIG. 1A is a side view showing an embodiment of a maintenance device for a welding torch according to the present invention, and FIG. 1B is a sectional view taken along line AA in FIG. FIG. 2 is a perspective view showing an embodiment of the maintenance device for a welding torch according to the present invention. 3 is an explanatory view of the welding torch rotating mechanism, (a) is a front view, (b) is a partially broken side view taken along line BB of (a) of FIG. FIG. 5 is an explanatory view of a welding torch cleaning mechanism, (a) shows a front view, (b) is a cross-sectional view taken along line CC in FIG. 5 (a), and FIG. 5 shows a welding wire cutting mechanism. FIG. 6A is a front view, FIG. 6B is a side view of FIG. 6A, and FIG. 6 is an explanatory view of a series of work carriage groups.
[0015]
A welding torch maintenance device 1 according to the present invention is a welding carriage of a series of work carriages A that travels inside an existing pipe P such as a gas pipe, a water pipe and a ground plant pipe buried in the ground shown in FIG. W equipped with a welding torch WM that is used for repair welding of a welding failure point WP of the existing pipe P (see FIGS. 1 to 3), and the welding torch WM reciprocates in the direction of the pipe axis PC of the existing pipe P. An X-axis moving mechanism 50 (see FIG. 1) that allows movement, and a Z-axis moving mechanism 40 (see FIG. 1) that allows the welding torch WM to reciprocate in the pipe diameter direction of the existing pipe P. I have.
[0016]
As shown in FIG. 2, the welding torch maintenance device 1 mounted on the welding carriage W includes a tip W2 and a nozzle W1 that are attached to the bracket member 42 of the Z-axis moving mechanism 40 described above. A welding torch turning mechanism 10 (see FIG. 3) that enables the welding torch WM to turn from the pipe diameter direction of the existing pipe P toward the pipe axis PC, and the existing pipe P by the welding torch turning mechanism 10. A welding torch cleaning mechanism 20 (FIG. 1) that moves the welding torch WM rotated in parallel with the tube axis PC of the pipe to move forward by the X-axis moving mechanism 50 and cleans the nozzle W1 at the tip of the welding torch WM. And a welding wire cutting mechanism 30 (see FIGS. 1, 2 and 5) for cutting the welding wire W4 inserted through the tip W2 of the welding torch WM into a predetermined length. It is. Here, each of the above mechanisms will be described.
[0017]
[X-axis moving mechanism]
The X-axis moving mechanism 50 is built in the welding carriage W, and a welding torch WM is mounted via a Z-axis moving mechanism 40 described later, and the welding torch WM reciprocates with respect to the pipe length direction of the pipe axis PC of the existing pipe P. The welding torch rotating mechanism 10 mounted on the bracket member 42 of the Z-axis moving mechanism 40 is adjusted with the welding torch cleaning mechanism 20 while moving and adjusting the position of the welding torch WM to the poorly welded portion WP. This is a moving mechanism for moving the welding wire cutting mechanism 30 to the arrangement position (see FIGS. 1 and 2).
[0018]
[Z-axis moving mechanism]
The Z-axis moving mechanism 40 is equipped with a welding torch WM installed in the welding carriage W, reciprocates the welding torch WM in the pipe radial direction of the existing pipe P, and repairs to a welding defect point WP in the existing pipe P. This is a moving mechanism for accurately performing welding (see FIG. 1).
[0019]
[Welding torch turning mechanism]
As shown in FIGS. 2 to 3, the welding torch rotating mechanism 10 is a mechanism for rotating the welding torch WM including the tip W2 from the pipe diameter direction of the existing pipe P toward the pipe axis PC. The structure includes a torch rotation base member 11 that is engaged with the bracket member 42 of the aforementioned Z-axis movement mechanism 40 and rotatably supports the welding torch WM by the rotation shaft 12 shown in FIG.
This torch rotation base member 11 is internally mounted on the rotation shaft 12 described above, and one end is formed in a long hole 13b formed at the tip of the cylinder rod 13a of the cylinder unit 13 by a pin member 14a. The mechanism is composed of a rotation link member 14 that is rotatably mounted.
[0020]
The welding torch turning mechanism 10 having such a configuration maintains the direction of the tip of the nozzle W1 in a direction perpendicular to the tube axis PC before operation. When compressed air is supplied to the cylinder unit 13, the cylinder rod 13a contracts.
Then, in the long hole 13b of the cylinder rod 13a, the pin member 14a mounted on the rotation link member 14 is in an idle state. Therefore, when the cylinder rod 13a contracts downward as shown in FIG. 3, the torch rotation base member The rotation link member 14, that is, the nozzle W <b> 1 is rotated in the direction indicated by the arrow of the tube axis PC using the rotation shaft 12 mounted on the 11 bearings 11 a as a support shaft.
[0021]
[Welding torch cleaning mechanism]
The welding torch cleaning mechanism 20 is rotated and moved in parallel with the pipe axis PC of the existing pipe P by the welding torch rotating mechanism 10 as shown in FIGS. This is a mechanism for cleaning the nozzle W1 moved forward by.
And the structure is built in the gear case 21 equipped in the main body of the welding cart W via the base member W6, and is rotated in the direction parallel to the pipe axis PC of the existing pipe P by the welding torch rotating mechanism 10 described above. The blade S1 that can be inserted into the gap W3 at the tip of the nozzle W1 of the welding torch WM moved forward by the X-axis moving mechanism 50 and that rotates by the operation of the worm gears G1 and G2 of the gear mechanism is provided. The scraper S is provided, and a discharge port S3 that is attached to the scraper S and discharges compressed air to the blade portion S1 of the scraper S (see FIGS. 2 and 4).
[0022]
The welding torch cleaning mechanism 20 configured as described above is first rotated in parallel with the pipe axis PC of the existing pipe P by the above-described welding torch rotation mechanism 10, and the above-described Z-axis movement mechanism 40 and the above-described mechanism. The nozzle W1 of the welding torch WM that has been moved forward and backward in the tube diameter direction and the tube length direction by the X-axis moving mechanism 50 is fitted into the scraper S. At this time, the scraper S already provided with the blade portion S1 starts to rotate via the worm gears G1 and G2 of the gear mechanism by driving the electric motor M1. When the blade portion S1 of the scraper S that rotates is inserted into the gap portion W3 at the tip of the nozzle W1, the spatter and the like deposited on the gap portion W3 are peeled off and removed by the rotation of the blade portion S1. When compressed air is further discharged from the discharge port S3, the spatter and the like peeled off from the gap portion W3 of the nozzle W1 are blown off by the wind pressure and removed.
[0023]
[Welding wire cutting mechanism]
As shown in FIGS. 1, 2, and 5, the welding wire cutting mechanism 30 is a mechanism that is inserted into the tip W2 of the welding torch WM and cuts the protruding welding wire W4 to a predetermined length. The welding wire cutting mechanism 30 is mounted on the base member W6 of the welding carriage W, and is built in a cutter case 31 arranged in parallel with the gear case 21 of the welding torch cleaning mechanism 20 described above. A cutter member 32 for inserting a tip portion of a welding wire which is inserted through the tip W2 of W1 and protrudes, and a movable member having a blade portion 33a that is rotatably mounted on the cutter member 32 by a shaft member 34 so as to be freely rotatable. The shaft member 34 is supported by the arm 33, the cylinder unit 35 that is a driving source of the movable arm 33, and the pin member 36 mounted in the long hole 35b formed at the tip of the cylinder rod 35a of the cylinder unit 35. And a mechanism for rotating the movable arm 33.
[0024]
The welding wire cutting mechanism 30 having such a mechanism uses the action of the movable arm 33 to convert a so-called “tub”, which is a mass of the welding wire generated at the tip of the welding wire W4 that is inserted through the tip W2 and protrudes, into the protruding portion. Thus, it is possible to smoothly remove and remove and re-start the arc.
[0025]
The operation of the maintenance device 1 for a welding torch having such characteristic mechanisms will be described below.
(1) When a so-called poor welded portion WP is found in the existing piping P by the television camera TV1 mounted on the traveling carriage A1 of the series of work carriages A, the subsequent connected polishing carriage A2 is located in the vicinity of the spot. Then, the welding cart W is stopped in the vicinity of the defective welding point WP, and then repair welding is performed.
(2) When repair welding is appropriately performed, deposits such as spatter accumulate in the gap portion W3 at the tip of the nozzle W1. When such a deposit such as spatter accumulates in the gap portion W3, the shielding gas deteriorates and the welding efficiency decreases. When the operator on the ground senses such a situation, the cleaning process of the gap portion W3 of the nozzle W1 is started. Prior to this cleaning process, the nozzle W1 including the tip W2 is rotated by the operation of the welding torch rotating mechanism 10 from the pipe radial direction of the existing pipe P to the pipe axis PC (see FIGS. 2 and 3). )
(3) Next, the nozzle W1 of the welding torch WM rotated in parallel with the pipe axis PC of the existing pipe P under the monitoring of the monitoring camera 7A shown in FIG. Is moved so as to be fitted to the scraper S including the blade S1 of the welding torch cleaning mechanism 20. Then, as shown in FIG. 4, the scraper S including the blade portion S1 is rotated by the operation of the worm gears G1 and G2 of the gear mechanism connected to the electric motor M1. The nozzle W1 centered by the Z-axis moving mechanism 40 is moved forward by the X-axis moving mechanism 50 to the rotating scraper S. By this forward movement, the gap portion W3 of the welding nozzle W1 is gradually inserted into the scraper S, and the spatter and the like deposited on the gap portion W3 are peeled off and removed by the blade portion S1 of the scraper S.
Furthermore, along with the operation of the scraper S, deposits such as spatter are removed by discharging compressed air from the discharge port S3 to the blade portion S1 of the scraper S (see FIG. 4). The gap between the nozzle W1 of the welding torch WM. The cleaning process of the part W3 is completed. (4) Further, the end of the welding wire W4 is in a state in which a so-called protrusion W5 covered with an oxidized film, slag, and the like is generated after welding. In the welding wire W4 having such a tab W5, the re-arc start is not smooth, and it is necessary to cut the tab W5.
Under the monitoring of the monitoring camera 7A, the Z-axis moving mechanism 40 and the X-axis moving mechanism 50 are operated, and the welding wire W4 inserted into the tip W2 of the welding torch WM is cut as shown in FIG. The cutter 30 of the mechanism 30 is moved to the entrance portion 32a. When the welding wire W4 having the tip W5 formed at the tip of the inlet portion 32a is guided, the Z-axis moving mechanism 40 is operated to guide the welding wire W4 from the inlet portion 32a to the cutter portion 32b. When the welding wire W4 is guided to the cutter part 32b, the cylinder rod 35a of the cylinder unit 35 is operated. Then, the movable arm 33 linked to the tip of the cylinder rod 35a rotates in the direction indicated by the arrow in FIG. By this rotation, the blade portion 33a of the movable arm 33 cuts the welding wire W4 having the tab W5 at the tip guided to the cutter portion 32b.
(5) After completion of the above work, each mechanism is returned to the state before the work, and the maintenance of the welding torch is completed.
In addition, the maintenance process of the welding torch by each of the above-described mechanisms is an example, and when deposits such as spatter are not deposited in the gap portion W3 of the nozzle W1, the cleaning operation by the welding torch cleaning mechanism 20 is performed. Similarly, when it is not necessary to cut the welding wire W4 protruding from the tip W2, it is needless to say that the cutting operation of the welding wire cutting mechanism 30 is not necessary. Of course, each mechanism can be operated individually.
[0026]
【The invention's effect】
The maintenance device for a welding torch according to the present invention described above has the following effects.
[0027]
That is, even inside the existing pipe P, the nozzle of the welding torch can be cleaned, and the welding wire protruding from the tip of the tip can be cut into a predetermined length. , Good supply of shield gas and good start when re-welding is possible, and maintenance work can be performed in the pipe of the existing piping, so the welding time can be shortened and the welding efficiency can be improved. .
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an embodiment of a maintenance device for a welding torch according to the present invention, in which FIG. 1 (a) is a side view, and FIG. 1 (b) is an AA view of FIG. It is arrow sectional drawing in a line.
FIG. 2 is a perspective view showing an embodiment of a welding torch maintenance device according to the present invention.
3A and 3B are explanatory views of a welding torch turning mechanism, in which FIG. 3A is a front view, and FIG. 3B is a partially broken side view taken along line BB in FIG.
4A and 4B are explanatory views of a welding torch cleaning mechanism, in which FIG. 4A is a front view, and FIG. 4B is a cross-sectional view taken along line CC in FIG.
5A and 5B are explanatory views of a welding wire cutting mechanism, in which FIG. 5A is a front view, and FIG. 5B is a side view of FIG.
FIG. 6 is an explanatory diagram of a series of work cart groups.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Welding torch maintenance device 7A Monitoring camera 10 Welding torch rotating mechanism 11 Torch rotating base member 12 Rotating shaft 13 Cylinder unit 13a Cylinder rod 13b Long hole 14 Rotating link member 14a Pin member (rotating link member)
20 welding torch cleaning mechanism 21 gear case 30 welding wire cutting mechanism 31 cutter case 32 cutter member 32a inlet part 32b cutter part 33 movable arm 33a blade part 35 cylinder unit 35a cylinder rod 36 pin member 40 Z-axis moving mechanism 42 bracket member 50 X axis moving mechanism A Work carriage group A1 Traveling carriage A2 Polishing carriage G1 Worm gear G2 Worm gear M1 Electric motor P Existing piping PC Pipe shaft S Scraper S1 Blade (scraper)
S3 Discharge port V Control vehicle W Welding cart W1 Nozzle W2 Tip W3 Gap portion W4 Welding wire W5 Tub W6 Base member WM Welding torch WP Welding failure location

Claims (6)

A welding carriage equipped with a welding torch that runs inside existing pipes such as gas pipes, water pipes, and ground plant pipes buried in the ground, and that is used for repair welding of weld defects on the inner peripheral surface of the existing pipes Because
An X-axis movement mechanism that allows the welding torch to reciprocate in the pipe axis direction of the existing pipe; and a Z-axis movement mechanism that enables the welding torch to reciprocate in the pipe diameter direction of the existing pipe. In welding cart,
A welding torch rotating mechanism that is mounted on a bracket member of the Z-axis moving mechanism and that has a nozzle and is capable of rotating in the tube axis direction from the pipe radial direction of the existing pipe;
A welding torch cleaning mechanism for cleaning the tip of the nozzle of the welding torch that is rotated in parallel with the pipe axis of the existing pipe by the welding torch rotating mechanism and moved forward by the X-axis moving mechanism;
A maintenance device for a welding torch, comprising: A welding carriage equipped with a welding torch that runs inside existing pipes such as gas pipes, water pipes and ground plant pipes buried in the ground, and is used for repair welding of defective welds on the inner peripheral surface of the existing pipes Because
An X-axis movement mechanism that allows the welding torch to reciprocate in the pipe axis direction of the existing pipe; and a Z-axis movement mechanism that enables the welding torch to reciprocate in the pipe diameter direction of the existing pipe. In welding cart,
A welding torch rotating mechanism that is mounted on a bracket member of the Z-axis moving mechanism and that has a nozzle and that is capable of rotating in the tube axis direction from the pipe radial direction of the existing pipe;
Welding that is rotated in parallel with the pipe axis of the existing pipe by the welding torch rotating mechanism, moves forward by the X-axis moving mechanism, and cuts the welding wire inserted through the tip of the welding torch into a predetermined length A wire cutting mechanism;
A maintenance device for a welding torch, comprising: A welding carriage equipped with a welding torch that runs inside existing pipes such as gas pipes, water pipes, and ground plant pipes buried in the ground, and that is used for repair welding of weld defects on the inner peripheral surface of the existing pipes Because
An X-axis movement mechanism that allows the welding torch to reciprocate in the pipe axis direction of the existing pipe; and a Z-axis movement mechanism that enables the welding torch to reciprocate in the pipe diameter direction of the existing pipe. In welding cart,
A welding torch rotating mechanism that is mounted on a bracket member of the Z-axis moving mechanism and that has a nozzle and is capable of rotating in the tube axis direction from the pipe radial direction of the existing pipe;
A welding torch cleaning mechanism for cleaning the tip of the nozzle of the welding torch that is rotated in parallel with the pipe axis of the existing pipe by the welding torch rotating mechanism and moved forward by the X-axis moving mechanism;
Welding that is rotated in parallel with the pipe axis of the existing pipe by the welding torch rotating mechanism, moves forward by the X-axis moving mechanism, and cuts the welding wire inserted through the tip of the welding torch into a predetermined length A wire cutting mechanism;
A maintenance device for a welding torch, comprising: The welding torch turning mechanism is
A torch rotation base member that is attached to a bracket member of the Z-axis movement mechanism and that is mounted with a welding torch that is pivotally supported by a rotation shaft;
A rotation link mechanism, which is built in the torch rotation base member, and includes a rotation link member that is mounted on the rotation shaft and engages one end of the cylinder unit with the tip of the cylinder rod of the cylinder unit. It is characterized by
The maintenance device for a welding torch according to any one of claims 1 to 3. The welding torch cleaning mechanism is:
A welding torch that is housed in a gear case mounted on a main body of a welding carriage via a base member, is rotated on the pipe axis of an existing pipe by the welding torch rotating mechanism, and is moved forward by the X-axis moving mechanism. A scraper that can be inserted into the gap portion of the gear and rotated by the operation of the gear mechanism;
A discharge mechanism that is attached to the scraper and blows compressed air onto the scraper part.
The maintenance device for a welding torch according to any one of claims 1 and 3. The welding wire cutting mechanism is
It is mounted in a cutter case mounted on the main body of the welding carriage via a base member, rotated in the pipe axis direction of the existing pipe by the welding torch rotating mechanism, moved forward by the X-axis moving mechanism, and In the welding torch that is moved upward in the pipe radial direction by the Z-axis moving mechanism, a cutter member that allows insertion of a welding wire inserted through the tip of the welding torch;
The cutter member is pivotally mounted on the cutter member, has a blade portion, and has a movable arm that pivotally attaches one end to the tip of a cylinder rod of the cylinder unit. ,
The maintenance device for a welding torch according to any one of claims 2 to 3.

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