JP4326491B2 - Single-side welding equipment - Google Patents

Description

  The present invention provides a single-sided machine equipped with a traveling welder that welds a material to be welded fed on a backing device such as a flux backing member and / or a copper plate backing device while traveling in the longitudinal direction of the backing device. It relates to automatic welding equipment.

  In the single-sided automatic welding equipment, a backing member such as a flux backing member and / or a copper plate backing member, and a welding device that straddles the backing member and can travel in the longitudinal direction of the backing member are provided. . In the welding apparatus, a pair of girders (rails) extending in a direction perpendicular to the longitudinal direction of the backing member are provided outside both ends in the longitudinal direction of the backing member. Each saddle travels in the longitudinal direction of the girder, and the welder travels on the welder beam spanned between the pair of saddles.

  In such a single-sided welding facility, the position where the backing member is disposed is such that the panel on which the steel plate to be welded is temporarily fixed has a weld line (also referred to as a seam) as the tacking portion coincides with the backing member. The saddle moves on the girder in the longitudinal direction of the girder (parallel to the longitudinal direction of the backing member), that is, moves in a direction perpendicular to the longitudinal direction of the backing member. Welding is performed by placing the welder over the weld member and then moving the welder along the weld line by moving the welder on the welder beam, i.e., in the longitudinal direction of the backing member. The Such single-sided welding apparatuses are disclosed in Patent Documents 1 and 2.

Japanese Utility Model Publication No. 50-53429 Japanese Utility Model Publication No. 53-21617

  However, in these prior arts, there is a case where the welding machine travels with a single welding machine beam, and a panel having two or more welding lines is temporarily attached by temporarily attaching three or more steel plates to be welded. In the case of welding by traveling, a plurality of welding machines are required, and in this case, there are the following problems.

  FIG. 6 is a schematic diagram showing a single-side welding apparatus including two welding machines 1 and 2. Two pairs of saddles 5 and 6 and saddles 7 and 8 run on a pair of parallelly extending girders 9 and 10. Between the two pairs of saddles 5 and 6 and between the saddles 7 and 8, welder beams 3 and 4 are respectively stretched, and the welders 1 and 2 run on the welder beams 3 and 4, respectively. It has become. The backing member is arranged in parallel with the welding machine beams 3 and 4, and when a plurality of welding lines are welded simultaneously, a plurality of backing devices are also installed.

  Then, a panel on which a plurality of steel plates to be welded is temporarily transported to the place where the backing apparatus is disposed, and the welding line is positioned on the backing member and stopped. 7 and 8 run on the girders 9 and 10 to place the welding machines 1 and 2 on the two welding lines of the panel. Then, the welding machines 1 and 2 are caused to travel on the welding machine beams 3 and 4 so that the welding machines 1 and 2 are positioned on the welding start ends of the respective welding lines. After that, welding is started by feeding a welding wire from the torches of the welding machines 1 and 2 toward the groove portion of the welding line and generating an arc. Welding is performed by welding lines by running along. Each saddle 5-8 runs on the girder by two wheels spaced apart in the longitudinal direction of the girder 9,10.

  The welding machines 1 and 2 are, for example, a four-electrode welding machine having four torches, and a wire supply device and the like are also mounted on the welding machines 1 and 2. Moreover, since the panel welded by single-sided automatic welding is also used for the structural material of a ship, etc., it is long, and since such a panel is arrange | positioned between the girders 9, 10, welder beam 3, 4 is also long. For this reason, a strong load is applied to the saddles 5, 6, 7, and 8 that support the welders beams 3 and 4 and the welders 1 and 2, and therefore, the wheel intervals of the saddles 5 to 8 are extremely long. Thus, the length A in the longitudinal direction of the girders 9 and 10 of the saddles 5 to 8 is extremely long. Further, in order to avoid the interference between the saddles 5 and 6 and the saddles 7 and 8, respectively, the minimum arrangement pitch between the welding machine 1 and the welding machine 2 is A, which is extremely long as well.

  That is, the length of the saddles 5 to 8 (wheel spacing) needs to be a certain length or more corresponding to the length of the welder beams 3 and 4 in order to support heavy objects and large structures. In general, it is said that the optimum wheel spacing of the saddle is 1/5 to 1/7 of the welder beam length. For example, when the weld line length is 20 m, the required length of the welder beam that can weld this weld line is 26 m. Thus, when the beam length is 26 m, the wheel interval of the saddle is 5.2 m to 3.7 m, and the length of the saddle is about 4.0 m or more in consideration of the wheel diameter. Therefore, the minimum arrangement pitch A of the welders 1 and 2 is 4.0 m or more, and the welder beams 1 and 2 cannot approach 4.0 m or less. If it does so, the space | interval of a weld line also needs to leave | separate 4.0 m or more, and in the present condition with many things with a weld line interval of 3 m or less, the single-sided automatic welding apparatus shown in FIG. 6 is not practical.

  The present invention has been made in view of such a problem, and provides a single-side welding apparatus capable of simultaneously welding a plurality of welding lines having a short interval with each other using a plurality of welding machines. With the goal. Another object of the present invention is to use a plurality of three or more welding machines to simultaneously weld three or more welding lines having a short distance from each other. An object of the present invention is to provide a single-side welding apparatus that eliminates the above-mentioned problem.

  The single-side welding apparatus according to the first invention of the present application includes a pair of parallelly extending girders, two pairs of saddles traveling on the girders, and two welder beams spanned between each pair of saddles, Two welders that run on each welder beam, and the welder beam is fixed at a position closer to the other saddle than the center position of the saddle in the longitudinal direction of the girder. Features.

  The single-side welding apparatus according to the second invention of the present application is a pair of first girder extending in parallel and a second girder extending in parallel with the first girder and extending outside the first guard. A pair of first saddles and a pair of second saddles traveling on the first girder, a pair of third saddles and a pair of fourth saddles traveling on the second girder, and the first A first welder beam spanned between saddles; a second welder beam spanned between the second saddles; a third welder beam spanned between the third saddles; A fourth welder beam spanned between four saddles, and first to fourth welders running on the first to fourth welder beams, respectively, Welding machine beam, 3rd welding machine beam, 4th welding machine beam and 2nd welding machine beam are arranged in this order The first to fourth welder beams are arranged with respect to the first to fourth saddles, respectively, with the position between the third welder beam and the fourth welder beam as the center. The girder is fixed at a position closer to the arrangement center than the center position in the longitudinal direction of the girder.

  The single-side welding apparatus according to the third invention of the present application is a pair of first girder extending in parallel and a second girder extending in parallel with the first girder outside the first guard while extending in parallel with the pair. A pair of first saddles and a pair of second saddles traveling on the first girder, a pair of third saddles and a pair of fourth saddles traveling on the second girder, and the first A first welder beam spanned between saddles; a second welder beam spanned between the second saddles; a third welder beam spanned between the third saddles; A fourth welder beam spanned between four saddles, and first to fourth welders respectively running on the first to fourth welder beams, the welder beam being a third Welding machine beam, 1st welding machine beam, 2nd welding machine beam and 4th welding machine beam are arranged in this order The first to fourth welder beams are arranged with respect to the first to fourth saddles, respectively, with the position between the first welder beam and the second welder beam as the center. The girder is fixed at a position closer to the arrangement center than the center position in the longitudinal direction of the girder.

  The single-side welding apparatus according to the fourth invention of the present application includes n (n is an even number) pair of parallelly extending first to nth girders arranged sequentially from the inside to the outside, and the first to nth pairs of girder. Two pairs of 1st to 2n pairs of saddles each traveling on the girder, and 1st to 2n welds respectively spanned between the first pair to 2n pairs of saddles so as to be parallel to each other. And the first to second n welders traveling on the first to second n welder beams, respectively. The longest one of the welder beams is closer to the center of placement and the shortest. Each welding machine beam is fixed to the saddle at a position closer to the arrangement center than the center position in the longitudinal direction of the girder. It is characterized by that.

  The single-sided welding device according to the fifth invention of the present application includes n (n is an even number) pair of parallelly extending first to nth girders arranged sequentially from the inside to the outside, and the first to nth pairs of girder. 1n to 2n pairs of saddles each traveling on a girder, and 1st to 2n welds spanned in parallel to each other between the 1st to 2n pairs of saddles. And the first to second n welders traveling on the first to second n welder beams, respectively. The shortest one of the welder beams is closer to the center of the arrangement, and is the longest. Each welding machine beam is fixed to the saddle at a position closer to the arrangement center than the center position in the longitudinal direction of the girder. It is characterized by that.

  The single-sided welding apparatus according to the sixth invention of the present application includes n (n is an even number) pair of parallelly extending first to nth girders arranged sequentially from the inside to the outside, and the first to nth pairs of girder. A pair of m (m is an integer greater than or equal to 3) pairs of first to m-th saddles that run on the girder and are provided for each girder, and between the first to m-th pairs of saddles. Each of the first to m-th welder beams stretched in parallel, and each of the first to m-th welders running on the first to m-th welder beams, the welder The longest beam is arranged near the center of the arrangement, and the shortest one is arranged near the end, and each welding machine beam is arranged in the longitudinal direction of the girder with respect to the saddle. It is fixed at a position closer to the arrangement center than the center position.

  The single-sided welding device according to the seventh invention of the present application includes n (n is an even number) pair of parallelly extending first to nth girders arranged sequentially from the inside to the outside, and the first to nth pairs of girder. A pair of m (m is an integer greater than or equal to 3) pairs of first to m-th saddles that run on the girder and are provided for each girder, and between the first to m-th pairs of saddles. Each of the first to m-th welder beams stretched in parallel, and each of the first to m-th welders running on the first to m-th welder beams, the welder The beams are arranged such that the shortest beam is closer to the center of the arrangement and the longest beam is closer to the end, and each of the welder beams is arranged in the longitudinal direction of the girder with respect to the saddle. It is fixed at a position closer to the arrangement center than the center position.

  According to the present invention, when there are two welders, the welder beam is fixed at a position close to the other saddle in the saddle. Therefore, the distance between the welders, that is, the distance between the welders is set to the length of the saddle. However, it can be made small.

  When there are 4 welders, 2 pairs of girders are provided, 2 pairs of welder beams are placed on 1 pair of girders, and 2 pairs of welder beams are placed on the other pair of girders. Since each welder beam is fixed at a position near the center of the welder beam arrangement in the saddle, in one girder, if two pairs of saddles approach each other, the welding supported by the pair of saddles The distance between the machines is extremely small, and the saddle traveling on the other girder is not interfered with because the saddle for the welder beam next to the welder beam supported by this saddle travels on the one girder. In addition, the adjacent welder beam can be approached. Therefore, all four welders can reduce the distance between them regardless of the length of the saddle, and a panel with a short weld line interval can also weld all the weld lines simultaneously.

  Such an effect is exhibited not only when there are four welding machines but also when there are six or more even machines.

  Further, as in the sixth and seventh inventions of the present application, when two or more pairs (n is an even number) of girder are provided and at least one pair of saddles is provided for each girder, The girder is provided with 3 pairs of saddles instead of 4 pairs, and the number of welders is less than the maximum possible welder for the number of girders, as in the case of 3 welders instead of 4 In the case (when an odd number of welders are provided), the same effect is obtained.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. FIG. 1 is a schematic plan view showing a first embodiment of the present invention. This embodiment is a single-sided welding apparatus provided with two welding machines 1 and 2. A pair of saddles 5, 6 and a pair of saddles 7, 8 run on a pair of parallelly extending girders 9, 10, respectively. Between the two pairs of saddles 5 and 6 and between the saddles 7 and 8, welder beams 3 and 4 are respectively stretched, and the welders 1 and 2 run on the welder beams 3 and 4, respectively. It has become. The backing member is arranged in parallel with the welding machine beams 3 and 4, and this embodiment is preferably used when two welding lines are welded at the same time. More than that.

  In the present embodiment, the welder beams 3 and 4 are biased toward the adjacent saddles so that the distance between the welder beams 3 and 4 is smaller with respect to the saddles 5 and 6 and the saddles 7 and 8, respectively. Is fixed. In this way, with the saddles 5 and 6 and the saddles 7 and 8 being closest to each other, the arrangement pitch between the welding machine 1 and the welding machine 2 is B, which is extremely small compared to the case of FIG. can do.

  Next, the operation of this embodiment will be described. A panel with a plurality of steel plates (3 or more) to be welded is transported to the location of the backing device, and each weld line (2 or more) is positioned on the backing member and stopped. After that, the saddles 5 and 6 and the saddles 7 and 8 run on the girders 9 and 10 to place the welding machines 1 and 2 on the two weld lines of the panel. Then, the welding machines 1 and 2 are caused to travel on the welding machine beams 3 and 4 so that the welding machines 1 and 2 are positioned on the welding start ends of the respective welding lines. After that, welding is started by feeding a welding wire from the torches of the welding machines 1 and 2 toward the groove portion of the welding line and generating an arc. Welding is performed by welding lines by running along. Each saddle 5-8 runs on the girder by two wheels spaced apart in the longitudinal direction of the girder 9,10.

  Thus, in this embodiment, in particular, in the single-sided welding apparatus provided with two welding machines, the interval B between the welding machines 1 and 2 can be shortened, so regardless of the welding line interval. Two weld lines can be welded at the same time, so that the welding efficiency can be improved, and there is no restriction on the range of application regarding the interval between the weld lines, and it can be applied to various panels.

  However, when there are two welding lines, that is, when there are two welding machines, the embodiment shown in FIG. 1 can solve the problem of the present invention. However, as shown in FIG. As described above, for example, in the case of four units, this embodiment cannot solve the problem of the present invention. That is, if the adjacent welder beams are set close to each other and offset, the distance from the adjacent welder beam on the opposite side becomes longer by that amount. Therefore, when there are three or more welders, it was not possible to weld the weld lines with short intervals at the same time. The following embodiments have solved this problem.

  FIG. 2 is a schematic plan view showing a second embodiment of the present invention. A pair of first girder 11a, 11b extending in parallel is provided, and a pair of second girder 12a extending parallel to the first girder 11a, 11b is provided outside the first girder 11a, 11b. , 12b are provided. A pair of first saddles 13a and 13b and a pair of second saddles 14a and 14b travel on the first girders 11a and 11b, and a pair of third saddles 12A and 12b. The saddles 15a and 15b and a pair of fourth saddles 16a and 16b travel. The first welder beam 17 is stretched between the first saddles 13a and 13b, and the second welder beam 18 is stretched between the second saddles 14a and 14b. The third welder beam 19 is spanned between the third saddles 15a and 15b, and the fourth welder beam 20 is spanned between the fourth saddles 16a and 16b. The first to fourth welders 21, 22, 23, and 24 travel on the first to fourth welders beams 17, 18, 19, and 20, respectively. The four welding machine beams 17 to 20 are arranged in the order of the first welding machine beam 17, the third welding machine beam 19, the fourth welding machine beam 20, and the second welding machine beam 18, and the third welding machine beam. The position between 19 and the fourth welder beam 20 is the center of placement of the welder beam. These first to fourth welder beams 17, 18, 19, and 20 are respectively connected to the first saddles 13a and 13b, the second saddles 14a and 14b, the third saddles 15a and 15b, and the fourth saddles 16a and 16b. The girder is fixed at a position closer to the center of the arrangement than the center position in the longitudinal direction of the girder. That is, for example, the third welder beam 19 is fixed to the saddles 15a and 15b at positions close to the other saddles 16a and 16b running on the same girders 12a and 12b. Similarly, the fourth welder beam 20 is fixed to the saddles 16a and 16b at positions close to the other saddles 15a and 15b running on the same girders 12a and 12b. The same applies to the other welder beams 17 and 18.

  Therefore, even if the length of the saddle is A, the interval (arrangement pitch) between the welding machines 21, 22, 23, and 24 is extremely smaller than A as shown in FIG. Thus, the welders 21 to 24 can be arranged at extremely short intervals.

  As described above, since the welder interval can be reduced regardless of the saddle length, the minimum weld line interval that can be welded simultaneously is sufficiently short. Wires can be welded simultaneously.

  4 is a plan view showing equipment embodying the present embodiment, and FIG. 5 is a partial left side view of FIG. However, FIG. 5 shows a state in which the welder beams 19 and 20 are closest to each other. On the factory floor such as in the pit, backing devices 41 and 42 are arranged in parallel with the welding machine beams 19 and 20. That is, the backing devices 41 and 42 and the welder beams 19 and 20 extend in a direction perpendicular to the paper surface of FIG. As such a backing device, there are a copper plate backing device 41 provided with a long copper plate and a flux backing device 42 in which a flux is dispersed and stored in a long toy. The copper plate backing device 41 and the flux backing device 42 are appropriately selected and used depending on the welding method, the steel type to be welded, and the like. Between the copper plate backing device 41 and the flux backing device 42, there is provided a roller device 43 for carrying out the panel transported thereon in a direction perpendicular to the paper surface of FIG.

  On the other hand, the welders 23, 24, etc. extend downward from the carriage 33, which travels on the welder beams 19, 20, etc., the welding wire feeder 32 mounted on the carriage 33, and the carriage 33. A welding torch 31 and a wire feed cable 34 are provided. Although not shown in FIG. 5, the welders 19 and 20 are, for example, four-electrode welders, and four torches are arranged in the longitudinal direction of the welder beams 19 and 20. Further, saddles 15a, 16a, etc. that support the welder beams 19, 20, etc., on which the welders 23, 24, etc. travel, have two wheels 51, 52 that are spaced apart in the longitudinal direction of the girder 12a, etc. Have.

  In the single-side welding apparatus configured as described above, when a panel on which a plurality of steel plates to be welded are temporarily transported onto the backing devices 41, 42, etc., the wheels 51, 52 are placed on the girders 12a, etc. , The positions of the welder beams 19, 20 and the like are adjusted according to the position of the weld line on the panel. Thereafter, the welders 23, 24, etc. travel on the welder beams 19, 20, etc., move to the welding start end position, the welding wire is supplied from the welding wire supply device 32 to the torch 31, and is fed from the torch 31. An arc is formed between the welded wire and the panel weld line, and welding is disclosed. Simultaneously with the start of welding, the welders 23, 24, etc. travel on the welder beams 19, 20, etc., and the torch 31 moves along the weld line, so that the entire area of the weld line is welded.

  In this embodiment, as shown in FIG. 5, although the distance between the wheels 51 and 52 is wide and the saddles 15a and 16a are long, the interval between the adjacent welders 23 and 24 can be extremely shortened. . For example, when the beam length is 26 m and the saddle length is about 3.6 m or more, in this embodiment, the pitch between the welding machine 23 and the welding machine 24 is set to 2. It can be 6 m, and the welding machine pitch can be significantly reduced as compared with the minimum arrangement pitch A of the conventional welding machine being 3.6 m or more. Since the interval between the weld lines of the panels is often 3 m or less, the present invention is extremely useful in that simultaneous welding can be applied to these panels.

  Next, a third embodiment of the present invention will be described with reference to FIG. The present embodiment is different from the second embodiment shown in FIG. 2 in the arrangement order of the welder beams, and the components thereof are the same as those of the second embodiment. A pair of second girders 12a and 12b extending in parallel to the first girders 11a and 11b are provided outside the pair of parallel first girders 11a and 11b. A pair of first saddles 13a and 13b and a pair of second saddles 14a and 14b travel on the first girders 11a and 11b, and a pair of third saddles 12A and 12b. The saddles 15a and 15b and a pair of fourth saddles 16a and 16b travel. The first welder beam 17 is stretched between the first saddles 13a and 13b, and the second welder beam 18 is stretched between the second saddles 14a and 14b. The third welder beam 19 is spanned between the third saddles 15a and 15b, and the fourth welder beam 20 is spanned between the fourth saddles 16a and 16b. The first to fourth welders 21, 22, 23, and 24 travel on the first to fourth welders beams 17, 18, 19, and 20, respectively.

  In the present embodiment, the four welding machine beams 17 to 20 are arranged in the order of the third welding machine beam 19, the first welding machine beam 17, the second welding machine beam 18, and the fourth welding machine beam 20. The position between the first welder beam 17 and the second welder beam 18 is the center of placement of the welder beam. These first to fourth welder beams 17, 18, 19, and 20 are respectively connected to the first saddles 13a and 13b, the second saddles 14a and 14b, the third saddles 15a and 15b, and the fourth saddles 16a and 16b. The girder is fixed at a position closer to the center of the arrangement than the center position in the longitudinal direction of the girder. That is, for example, the first welder beam 17 is fixed to the saddles 13a and 13b at positions close to the other saddles 14a and 14b traveling on the same girders 11a and 11b. Similarly, the second welder beam 18 is fixed to the saddles 14a and 14b at positions close to the other saddles 13a and 13b traveling on the same girders 11a and 11b. The same applies to the other welder beams 19 and 20.

  Therefore, also in the present embodiment, as in the embodiment of FIG. 2, the interval between the adjacent welding machines 21 to 24 can be shortened regardless of the length of the saddle. Therefore, the same effect as in the second embodiment can be obtained. However, in this embodiment, except for the central pair of welder beams, the welder beam straddles a saddle traveling on the adjacent girder, and the welder beam is placed on the adjacent girder. It is necessary to devise such as bending to avoid the saddle or increasing the fixing position of the welder beam with respect to the saddle.

  Next, a description will be given of a fourth embodiment in the case where there are six or more even machines. In the second embodiment shown in FIG. 2, two pairs of saddles 13a, 13b, 14a, 14b and 15a, 15b, 16a, 16b are provided on two pairs of girders 11a, 11b and 12a, 12b. On the other hand, the welder beams 17, 18, 19, and 20 are supported, and the longest of the welder beams is supported by the saddle that travels the girder pair having the largest interval, that is, the outermost girder pair. Yes. By doing so, the welding machine beam located on one side can be fixed to the saddle in the same direction, that is, biased toward the installation center side with respect to the arrangement center of the welding machine beam. On the other hand, all of the welder beams located on the other side with respect to the arrangement center of the welder beam can be fixed to the saddle in the same other direction, that is, biased toward the arrangement center side. When this is applied to a single-side welding apparatus having 2n (n is an even number) welder, as a girder, n (n is an even number) pair extends in parallel and is sequentially arranged from the inside to the outside. n pairs of girders are provided. Since two pairs of saddles are arranged on each girder pair, two pairs of first to second ndle saddles traveling on the first to nth pairs of girder are installed. Further, since two welder beams are disposed in each girder pair, the first to second n welder beams respectively spanned between the first to second n pairs of saddles so as to be parallel to each other. Is installed. Then, the first to second n welders travel on the first to second n welder beams, respectively.

  In this case, the welder beam is arranged so that the longest beam is closer to the center of the arrangement and the shortest beam is closer to the end, and each welder beam is arranged with respect to the saddle pair. If it is fixed at a position closer to the center of the arrangement than the center position in the longitudinal direction of the girder, the longest welder beam is arranged at the center as in FIG. The welder beams can be arranged so as to be shorter, and each welder beam is fixed to the saddle at a position closer to the center of the welder beam, so that the interval between the welders can be reduced. .

  In addition, when there are an even number of welders or more, the welder beam is arranged so that the shortest welder beam is the center of the welder beam placement as in the third embodiment shown in FIG. It is also possible (fifth embodiment). That is, n (n is an even number) pair of parallelly extending first to nth girders arranged in order from the inside to the outside, and 2n pairs traveling on the first to nth girder respectively. First to second n pairs of saddles, first to second n welder beams spanned parallel to each other between the first to second n pairs of saddles; In the single-side welding apparatus having the first to second n welders respectively traveling on the beam of the 2n welder, the shortest of the welder beams is closer to the arrangement center and the longest is closer to the end. If any of the welding machine beams is fixed to a position closer to the arrangement center than the center position in the longitudinal direction of the girder with respect to the pair of saddles, respectively. Good.

  Next, the case where the number of welders is an odd number will be described. Each of the above embodiments is for avoiding the fact that saddles interfere with each other and the welding machines cannot be disposed close to each other when there is an even number of welding machines. However, in the embodiment shown in FIGS. 2 and 3, for example, one of the saddles 15a and 15b traveling on the outer girders 12a and 12b and the saddles 16a and 16b can be omitted. Alternatively, one of the saddles 13a and 13b and the saddles 14a and 14b traveling on the inner girders 11a and 11b can be omitted. In these cases, since one saddle pair does not exist, there are three welder beams, and hence three welders. However, as in the above embodiments, the mutual distance between the welders Can be shortened regardless of the length of the saddle.

  Therefore, in the case of an odd number of welders, in a single-sided welding apparatus provided with an even number of welders, one pair of saddles, one welder beam, and one welder. Can be omitted. This has the following configuration.

  That is, the single-side welding apparatus according to the sixth embodiment includes n (n is an even number) pair of parallelly extending first to nth girders arranged sequentially from the inside to the outside, and the first to nth pairs. Between the first pair to the m-th pair of saddles and the first pair to the m-th pair of saddles, wherein at least one pair is provided for each girder. Each of the first to m-th welder beams spanned so as to be parallel to each other, and each of the first to m-th welders running on the first to m-th welder beams, the welding The machine beam is arranged such that the longest beam is closer to the center of the arrangement and the shortest beam is closer to the end, and each welder beam is arranged in the longitudinal direction of the girder with respect to the saddle. It is fixed at a position closer to the center of the arrangement than the center position.

  Further, the single-side welding apparatus of the seventh embodiment includes n (n is an even number) pair of parallelly extending first to nth girders arranged in order from the inside to the outside, and the first to nth pairs. Between the first pair to the m-th pair of saddles and the first pair to the m-th pair of saddles, wherein at least one pair is provided for each girder. Each of the first to m-th welder beams spanned so as to be parallel to each other, and each of the first to m-th welders running on the first to m-th welder beams, the welding The machine beam is arranged such that the shortest beam is closer to the center of the installation and the longest beam is closer to the end, and each welder beam is arranged in the longitudinal direction of the girder with respect to the saddle. It is fixed at a position closer to the center of the arrangement than the center position.

  These 6th and 7th embodiment also has the same operation effect as each above-mentioned embodiment.

1 is a schematic plan view showing a single-side welding apparatus according to a first embodiment of the present invention. It is a typical top view which shows the single-sided welding apparatus of 2nd Embodiment of this invention. It is a typical top view which shows the single-sided welding apparatus of 3rd Embodiment of this invention. It is a top view which shows the example which embodied the single-sided welding apparatus of 2nd Embodiment of this invention. It is the partial side view similarly. It is a typical top view which shows the conventional single-sided welding apparatus. It is a schematic plan view which shows a problem in the case of having four welding machines.

Explanation of symbols

1, 2, 21, 22, 23, 24: Welding machine 3, 4, 17, 18, 19, 20: Welding machine beam 5, 6, 7, 8, 13a, 13b, 14a, 14b, 15a, 15b, 16a 16b: Saddle 9, 10, 11a, 11b, 12a, 12b: Girder 31: Torch 41, 42: Backing device

Claims (7)

  A pair of parallel extending girder, two pairs of saddles running on the girder, two welder beams spanned between each pair of saddles, and two welder beams running on each welder beam A welding machine, wherein the beam of the welding machine is fixed at a position closer to the other saddle than a center position of the saddle in the longitudinal direction of the girder.   A pair of first girder extending in parallel, a pair of second girder extending in parallel and provided outside the first guard and in parallel with the first girder, and a pair traveling on the first girder A first saddle and a pair of second saddles, a pair of third saddles and a pair of fourth saddles traveling on the second girder, and a first welder spanned between the first saddles A beam, a second welder beam spanned between the second saddles, a third welder beam spanned between the third saddles, and a fourth weld spanned between the fourth saddles. And a first to fourth welder respectively traveling on the first to fourth welder beams, wherein the welder beam includes a first welder beam, a third welder beam, 4 welder beams and second welder beams are arranged in this order, and the third welder beam and the second welder beam The first to fourth welder beams are arranged with respect to the first to fourth saddles more than the center position in the longitudinal direction of the girder, with the position between the welder beam and the center. A single-sided welding apparatus characterized by being fixed at a position closer to the center.   A pair of first girder extending in parallel, a pair of second girder extending in parallel and provided outside the first guard and in parallel with the first girder, and a pair traveling on the first girder A first saddle and a pair of second saddles, a pair of third saddles and a pair of fourth saddles traveling on the second girder, and a first welder spanned between the first saddles A beam, a second welder beam spanned between the second saddles, a third welder beam spanned between the third saddles, and a fourth weld spanned between the fourth saddles. And a first to fourth welder respectively traveling on the first to fourth welder beams, wherein the welder beam comprises a third welder beam, a first welder beam, a first welder beam, 2 welding machine beam and 4th welding machine beam are arranged in this order, the first welding machine beam and the first welding machine beam The first to fourth welder beams are arranged with respect to the first to fourth saddles more than the center position in the longitudinal direction of the girder, with the position between the welder beam and the center. A single-sided welding apparatus characterized by being fixed at a position closer to the center.   n (n is an even number) pair of first to n-th girders extending in parallel and sequentially arranged from the inside to the outside, and two pairs of first girder traveling on the first to n-th girders, respectively. A pair of second to 2n pairs of saddles, first to second n welder beams spanned parallel to each other between the first to second n pairs of saddles, and the first to second n weldings. First to second n welders that run on the machine beam, and the welder beam is arranged such that the longest beam is closer to the center of the installation and the shortest beam is closer to the end. A single-side welding apparatus, wherein each welding machine beam is fixed to the saddle at a position closer to the arrangement center than a central position in the longitudinal direction of the girder.   n (n is an even number) pair of first to n-th girders that extend in parallel and are arranged sequentially from the inside to the outside, and 2n pairs of first girder traveling on the first to n-th pairs of girders. A pair of second to 2n pairs of saddles, first to second n welder beams spanned parallel to each other between the first to second n pairs of saddles, and the first to second n weldings. 1st to 2n welders that run on the machine beam, and the welder beam is arranged so that the shortest one is closer to the center of installation and the longest one is closer to the end. A single-side welding apparatus, wherein each welding machine beam is fixed to the saddle at a position closer to the arrangement center than a central position in the longitudinal direction of the girder.   n (n is an even number) pair of first to nth girders extending in parallel and sequentially arranged from the inside to the outside, and running on the first to nth girders and at least one pair for each girder A first to m-th pair of saddles of m (m is an integer of 3 or more) provided, and the first to m-th saddles spanned in parallel to each other. 1 to the m-th welder beam, and the first to m-th welders that run on the first to m-th welder beams, respectively. Each welding machine beam is positioned closer to the center of the saddle than the center position in the longitudinal direction of the girder. A single-sided welding apparatus, characterized by being fixed to. n (n is an even number) pair of first to nth girders extending in parallel and sequentially arranged from the inside to the outside, and running on the first to nth girders and at least one pair for each girder A first to m-th pair of saddles of m (m is an integer of 3 or more) provided, and the first to m-th saddles spanned in parallel to each other. A first to m-th welder beam, and first to m-th welders that run on the first to m-th welder beams, respectively. Each welding machine beam is positioned closer to the saddle than the central position in the longitudinal direction of the girder with respect to the saddle. A single-sided welding device characterized by being fixed to.

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