JP4628388B2 - Traveling type welding machine - Google Patents

Description

  The present invention relates to a traveling type welder that can reduce the installation space of a welding facility.

  In a welding facility equipped with a traveling type automatic welding machine, a pair of welded steel plates that are tack welded to each other are conveyed by a conveyor in a direction perpendicular to the welding line direction and stopped at a predetermined welding position. In this welding position, the automatic welding machine installed on the welding machine traveling beam is installed so as to be able to reciprocate in the direction perpendicular to the conveying direction of the welded steel sheet. It can move in the weld line direction.

  This automatic welder is a multi-electrode welder in which a plurality of torches are arranged in a straight line, and a terminal detector is installed at one end of the running direction so as to protrude forward, and at the other end. Is installed so that the flux collecting nozzle protrudes beyond the nozzle.

  A toy-shaped backing member having a U-shaped cross section is arranged below the welded steel plate installed at this predetermined welding position with its longitudinal direction parallel to the weld line, and the backing flux is It is stored in this backing member. Then, the backing member containing the backing flux is raised by the lifting device and brought into contact with the lower surface of the weld line position of the steel plate to be welded to prevent dripping of the molten steel during welding. A bead having a shape is formed.

  In order to supply this backing flux to the backing member, the backing flux spraying device runs along the weld line above the backing member. The spreading device moves along the welding line, and during this movement, the backing flux is spread on the backing member from the spreading device. In order to prevent the spraying device from interfering with the welded steel plate, the backing member is lowered during this time, and the spraying device travels under the welded steel plate to spray and collect the backing flux. Thereafter, the backing member on which the backing flux is placed is raised and brought into close contact with the steel plate to be welded, and then the automatic welding machine moves along the welding line so that the welding wire of the steel plate to be welded is one side with multiple electrodes. Weld.

  Such traveling type welders are disclosed in Patent Documents 1 to 4, for example.

Japanese Utility Model Publication No. 49-127426 Japanese Patent Laid-Open No. 48-49641 Japanese Utility Model Publication No. 50-27132 Japanese Utility Model Publication No. 58-119987

  However, the welding equipment provided with the conventional automatic welding machine has the following problems. The welded steel sheet to be welded may be bent upward along a broken line parallel to the weld line, or a reinforcing component may be mounted on the surface. For this reason, when the welded steel sheet is transported in a direction perpendicular to the welding line by the conveyor, if the welding machine is positioned above the welded steel sheet, the bent portion or the reinforcing part of the welded steel sheet interferes. Sometimes. Therefore, when transporting the welded steel sheet, the welding machine needs to escape from the upper position of the welded steel sheet and retract to a position that does not interfere with the front or rear welded steel sheet on the weld line of the welded steel sheet. . For this reason, the length of the welding equipment is determined by the total length of the length of the steel plate to be welded and the length of the retracted welding machine. Therefore, if the length of the automatic welding machine during retraction can be shortened, the length of the welding equipment can be shortened accordingly.

  The width of the factory where the welding equipment is installed (the length in the welding line direction) is determined by the length of the welding equipment (the length in the welding line direction). However, as the width of the factory, a space (length) for transporting the steel plate to be welded is inevitably necessary, but the length of the evacuation place of the welding machine is extraneous. In other words, the space for the automatic welder is necessary to prevent interference between the automatic welder, the steel plate to be welded, and the backing flux distribution device, but the width of the factory is determined by the space. It is desirable to make it as small as possible.

  The length when the welding machine is retracted should be as small as possible to determine the width of the factory. Further, as described above, the width of the factory is determined depending on the length of the welding equipment. However, in a place other than a predetermined welding position, the space for retreating the welding machine becomes an empty space.

  If the length of the welding equipment is shortened, the size (width) of the factory that houses it can be reduced, and if the width of the factory is reduced, the length of the overhead crane installed there can also be shortened, Equipment costs can be significantly reduced.

  In addition, when this welding equipment is newly installed in an existing factory, if the retracting length of the welding machine can be shortened, the width of the factory is the same as before the equipment update. The length can be increased accordingly, and the versatility of the welding object and the welding operation becomes extremely high.

  However, none of the conventional traveling type automatic welders have any idea about the width of the welder at the time of evacuation, so a large area is required as a space for welding equipment, and the equipment cost is high. I had to be.

  The present invention has been made in view of such problems, and reduces the equipment cost by minimizing the length in the weld line direction of the welding equipment relative to the maximum weld length of the weld line of the steel plate to be welded. An object of the present invention is to provide a traveling type welding machine that can perform the above-described operation.

  A traveling type welding machine according to the present invention includes one or a plurality of torches, a support device that supports the torch, and a termination detector that is disposed outside one end portion in the traveling direction of the support device, A flux recovery unit disposed outside the other end of the support device in the traveling direction, and the end detector is attached to the support device and rotatably supports the arm. An arm rotation driving member; and a sensor attached to a tip of the arm for detecting a welding end portion. The flux recovery unit is supported by the first elevating member attached to the support device and the elevating member. A flux recovery nozzle, and when the end detector detects the end of welding, the arm is rotated upward by the arm rotation driving member, and when the support device is in the retracted position, the first ascending And further comprising a control unit to increase the flux collecting nozzle of a member.

  In the present invention, the welding wire and the steel plate to be welded are fed from the torch while the end detector is in front and the flux recovery nozzle is in the rear during welding and the support device travels along the welding line. Welding is performed between the two. When the end detector detects the welding end, the control unit rotates the arm of the end detector upward to retract, and at the retracting position of the welding machine, the flux recovery nozzle is raised and retracted. For this reason, when the traveling type welder is retracted from the steel plate to be welded (standby), the length of the traveling type welder in the weld line direction is not necessary for the arrangement of the terminal detector and the flux recovery nozzle. Thus, the standby space for the welding machine is shortened as much as possible. Thereby, the width of the necessary welding equipment may be shorter than before, and the equipment cost is significantly reduced.

  The traveling type welding machine of the present invention further detects the groove position by moving along the groove of the welding line so that the welding wire fed from the torch moves in the groove. And a second elevating member that is attached to the support device so as to be movable up and down and supports the copying detector. It is preferable that the scanning detector is raised by the second elevating member when the movement is detected.

  Further, a front-flux spray nozzle that is attached to the support device in front of the welding direction of the torch and supplies the front flux to the groove portion of the weld line is provided, and further, a filler is supplied in front of the nozzle. It is preferable to provide a filler nozzle.

  Further, when the end detector detects a welding end, the control unit rotates the arm of the end detector, stops the supply of filler from the filler nozzle, while the support device is running. It is preferable that the scanning detector is raised, the welding condition is shifted to the final welding condition, the welding wire feed from the torch is stopped, the recovery of the flux recovery unit is stopped, and the travel of the support device is stopped in this order. .

  According to the present invention, when the traveling welder is in the retracted state, the arm of the end detector rotates upward and retracts, and the flux recovery nozzle rises and retracts. As a result, the arm of the end detector that protrudes forward in the welding direction of the traveling support device stands up, so that the length in the welding line direction of the welding machine is shortened, and the flux recovery arranged rearward in the welding direction As the part rises and retreats, the flux recovery part can be prevented from interfering with the backing flux spreader, etc., and this standby flux spreader enters under the traveling type welder during standby and spreads with the welder. The entire length of the apparatus in the weld line direction can be shortened. By the above effect, the length of the welding line direction of welding equipment can be shortened, and the installation area can be reduced.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. Fig.1 (a) is a front view which shows the traveling type welding machine 100 which concerns on embodiment of this invention. The steel plate 61 to be welded is transported to a predetermined welding position on the conveyor, and is arranged so that the weld line extends in the left-right direction in FIG. The support device 2 is supported by a traveling carriage (not shown) on the welding machine traveling beam, and is driven to reciprocate in the left-right direction in FIG. Accordingly, the support device 2 can move along the weld line of the steel plate 61 to be welded at a predetermined welding position.

  In the support device 2, the first electrode 3, the second electrode 4, and the third electrode 5 are arranged in series in the weld line direction. The first electrode 3, the second electrode 4, and the third electrode 5 are fixed to a gantry 2 a that constitutes the support device 2. The first to third electrodes 3 to 5 are such that the torches 3a to 5a are fixed to the support device 2, and the welding wire is fed from the torches 3a to 5a toward the groove of the welding line. Yes.

  A terminal detector 10 is disposed on the front surface of the gantry 2a at the front portion of the gantry 2a in the welding direction of the gantry 2a. The end detector 10 includes a rotating shaft 11 fixed to the lower part of the front surface of the gantry, an arm 12b rotatably supported by the rotating shaft 11, and an arm connected to the tip of the arm 12b by the rotating shaft 12a. 12, a sensor 13 attached to the tip of the arm 12, and a motor 14 that rotationally drives the rotary shaft 11. The driving force of the motor 14 is transmitted to the rotary shaft 11 via an appropriate speed reducer, and the arm 12b is moved to a horizontal position (operation mode) indicated by a solid line in FIG. 1A and a two-dot chain line in FIG. It is driven to rotate between the vertical position (retracted mode) shown. The arm 12 is connected to the arm 12b by a rotating shaft 12a, and this connection allows the sensor 13 installed at the tip of the arm 12 to move up and down with some play.

  The support device 2 is provided with a hopper 20 for storing the groove filler on the front surface of the gantry 2 a, and the tip of the filler spray nozzle 21 led out from the lower end of the hopper 20 is connected to the first electrode 3. It arrange | positions toward the groove | channel in the front position with respect to the welding direction. Therefore, the groove filler supplied from the hopper 20 is supplied into the groove from the tip of the filler spray nozzle 21. The groove filling material fills the groove during arc welding by the first to third electrodes 3 to 5 to alleviate the gap and the difference in route length.

  Further, a scanning detector 30 is installed at the front portion of the gantry 2a of the support device 2 at a position ahead of the filler spray nozzle 21 on the weld line in the welding direction. The scanning detector 30 detects the position of the welding line by moving within the groove of the welding line while being guided by the groove, and the torches 3a to 5a of the first to third electrodes 3 to 5 are welded. Used to control so that it can move along the line. The scanning detector 30 reliably moves the torches 3a to 5a along the weld line, and the welding wires fed from the torches 3a to 5a are reliably supplied into the groove. The scanning detector 30 is also attached to the gantry 2a of the support device 2 so as to be movable up and down, and is driven up and down by an appropriate drive device.

  Furthermore, a flux recovery unit 40 is installed at the rear in the welding direction of the gantry 2 a of the support device 2. The flux collection unit 40 includes a flux collection nozzle 41 that sucks and collects, after welding, the remaining surface flux that has not been melted during welding, among the surface fluxes dispersed on the groove from the surface flux spray nozzles 22 and 23; A support portion 42 that supports the flux collection nozzle 41 so that it can be swung within a predetermined range via a swing shaft 47, a guide rail 44 that extends vertically, and the support portion 42 are fixed. In addition, a slider 43 that slides on the guide rail 44 and a cylinder 46 whose tip end of the cylinder rod 45 is connected to the slider 43 are provided. When the cylinder 46 is driven to retract the cylinder rod 45, the slider 43 connected to the cylinder rod 45 moves upward along the guide rail 44. On the other hand, when the cylinder 46 is driven to advance the cylinder rod 45, the slider 43 descends along the guide rail 44, and the lower end of the nozzle 41 is positioned on the groove. In the operation mode, the flux recovery nozzle 41 is positioned on the groove at a position behind the third electrode 5 on the weld line, and in the retracted mode, the slider 43 is a rail as shown in FIG. Ascending along 44, the nozzle 41 rises.

  Based on the end detection signal from the sensor 13 of the end detector 10, the control unit (not shown) drives the arm 12 of the end detector 10, raises the scanning detector 30, and sets the groove from the filler hopper 20. The supply of the filler, the welding conditions of the first to third electrodes 3 to 5, the rise of the flux recovery nozzle 41, and the like are controlled according to a predetermined sequence.

  Next, the operation of the traveling type welding machine 100 of the present embodiment configured as described above will be described. FIG. 4A shows a state where the welding machine 100 is in the retracted position. The welding machine 100 is retracted from the steel plate 61 to be welded on the side opposite to the welding direction, and this is the retracted state. As shown to Fig.4 (a), the flux collection | recovery nozzle 41 exists in a raise position, and avoids interference with the backing flux distribution apparatus 70. FIG. In order to always perform this interference avoiding operation, a retracting position dog is provided on the welding machine traveling beam, and when this dog is detected by a detector such as a limit switch attached to the welding machine 100, the flux recovery nozzle 41 is retracted upward. It is a mechanism. Thereby, when the welding machine 100 approaches the retracted position, the limit switch works and the flux collection nozzle 41 rises.

  Since the welding machine 100 travels in the welding direction from the retracted position and the dog disappears at a position where it does not interfere with the backing flux spraying device 70, the flux recovery nozzle 41 is lowered. When welding is started, the first, second, and third electrodes 3 to 5 are set on the tab plate 51 at the welding start end, and the terminal detector 10 and the scanning detector 30 that precede the first, second, and third detectors 30 are welded. It is set on the steel plate 61. In this state, the flux recovery nozzle 41 is in a retracted state upward. Welding is started, and the welding machine 100 travels in the welding progress direction while continuing welding. When the flux recovery nozzle 41 comes near the start point of the weld bead, the flux recovery nozzle 41 descends and starts to collect the dispersed surface flux. FIG. 2 is a schematic diagram showing the vicinity of the end of the weld line. The welding wires sent from the first electrode 3, the second electrode 4, and the third electrode 5 are supplied into the groove 1 a of the steel plate 61 to be welded. Then, the front flux is supplied into the groove 1 a from the front flux spray nozzle 22 at a position in front of the first electrode 3 in the welding direction. Further, in front of the front flux distribution nozzle 22 in the welding direction, the roller of the copying detector 30 rolls in the groove 1a and is guided by the groove 1a to detect the position of the weld line. A sealing bead 50 is provided in advance at the welding end portion of the steel plate 61 to be welded. The sealing bead 50 is a strong bead in which a weld line end portion following the tab plate 51 is welded in advance in order to prevent end cracking of the weld bead that occurs in single-sided welding. And the tab board 51 is weld-fixed to the front-end surface of the welding direction of the to-be-welded steel plate 61 so that it may protrude ahead from the welding line terminal part of the to-be-welded steel plate 61. FIG.

  The sensor 13 of the terminal detector 10 is, for example, a magnetic sensor, and detects a metal such as a steel plate in the vicinity thereof. As the welding progresses, when the support device 2 of the welding machine 100 travels along the weld line toward the end position, the sensor 13 at the end of the arm of the end detector 10 includes the steel plate 61 and the tab to be welded. It passes through the plate 51 and reaches the front end of the tab plate 51. Then, since the sensor 13 cannot detect the metal beyond the front end portion of the tab plate 51, the sensor 13 detects the front end portion of the tab plate and outputs a terminal end detection signal to the control unit. Then, the control unit drives the motor 14 to rotate the arm 12 upward, and retracts the arm 12 and the sensor 13 upward. Further, the spraying of the groove filler from the filler hopper 20 is stopped. Further, the scanning control of the scanning detector 30 is stopped and the scanning detector 30 is raised. The reason why the scanning detector 30 is raised is to prevent the roller of the scanning detector 30 from riding on the sealing bead 50 because the support device 2 continues to travel during this time.

  And a control part makes the welding conditions by the 1st thru | or 3rd electrodes 3 thru | or 5 transfer to the welding conditions of a termination | terminus part. Thereafter, energization to the first electrode 3, the second electrode 4, and the third electrode 5 is sequentially stopped. Then, flux collection by the flux collection nozzle 41 is stopped, the cylinder 46 is driven, and the flux collection nozzle 41 is raised and retracted. Further, the travel of the support device 2 is stopped (stop of the welding machine travel).

  The order of the operation of each member after the end detection by the sensor 13 of the end detector 10 is arbitrary, but the arm of the end detector 10 is raised, the copying control of the copying detector 30 is stopped and raised, the flux dispersion is stopped, It is preferable to carry out in the order of the transition from the welding condition to the termination condition, the sequential stop of the first to third electrodes 3 to 5, the flux recovery stop, and the welding machine travel stop.

  In particular, in order to reduce the standby position of the welding machine 100 as much as possible, it is necessary to raise and retract the arm 12 of the end detector 10 immediately after the end detection is performed. At this time, in order to prevent the scanning detector 30 from riding on the sealing bead 50, the scanning detector 30 also needs to be raised immediately after the end detection is performed. When the length of the arm 12 is set so that the distance between the sensor 13 and the scanning detector 30 is the sum of the length of the tab plate 51 and the sealing bead 50, the length of the arm 12 is minimized. Can be as long as possible.

  The end detector 10 is installed on the welded steel plate 61 at the same time when the scanning detector 30 is installed on the welded steel plate 61 at the welding start point.

  FIG. 3A is a plan view of the welding equipment, and FIG. 3B is a front view of the same. The welded steel sheet 61 is transported in the steel sheet transport direction. And the part which removed the conveyance area of the steel plate becomes the retreat space of the welding machine 100. Therefore, the width of the factory is a distance obtained by adding the length of the welded steel sheet 61 (maximum welding length) and the length of the retreat space of the welding machine.

  FIG. 4A is a front view showing the retracting mode of the welding machine 100 in the embodiment of the present invention, and FIG. 4B is a front view showing the retracting mode of the welding machine 200 in the conventional apparatus. In the present invention, in the welding machine 100 that has passed through the end of the steel plate 61 to be welded, the arm 12 of the end detector 10 is pivoted upward and retracted, and the flux recovery nozzle 41 is lifted and retracted. Thus, since the arm 12 of the terminal detector 10 is rotated upward and is in the standing state, the length of the welding machine 100 is short, and the retreat space L1 of the welding machine 100 is extremely small. Further, a backing flux spreader 70 for spreading the backing flux on a backing device (not shown) extending along the weld line runs along the backing device, and during this running, the backing The backing flux is sprayed from the hopper of the flux spraying device 70 onto the backing device. If the backing flux distribution device 70 is not retracted from the conveyance area of the welded steel plate 61, the welded steel plate 61 cannot be conveyed to a predetermined welding position. Conventionally, as shown in FIG. 4B, the flux collecting nozzle 41 at the rear of the welding machine 200 is obstructed, and the backing flux spraying device 70 can wait only behind the flux collecting nozzle 41 of the welding machine 200. There wasn't.

  In the present invention, as shown in FIG. 4 (a), the flux collecting nozzle 41 is retracted upward, so that the backing flux spraying device 70 enters below the collecting nozzle 41, and the third electrodes 3-5. It is possible to enter the vicinity. Therefore, the evacuation space L1 required for standby of the welding machine 100 and the backing flux distribution device 70 is extremely small as shown in FIG. On the other hand, conventionally, as shown in FIG. 4B, the retreat space L2 of the welding machine 200 and the front flux spraying device 70 is a flux recovery nozzle from the tip position where the arm 12 of the welding machine 200 extends horizontally. The length of the welding machine up to the position where 41 is arranged is added to the length of the hopper of the surface flux spreading device 70, and an extremely long retreat space L1 is required. Therefore, by using the welding machine of the present invention, it is possible to reduce the space of the factory where the welding equipment is installed as compared with the conventional case.

  In this embodiment, a U-shaped toy-shaped backing member is used. However, the same effect can be obtained by using a backing copper plate instead of the U-shaped toy.

It is a front view which shows the traveling type welding machine which concerns on embodiment of this invention. It is a schematic diagram which shows the terminal vicinity vicinity of a weld line. (A), (b) is a figure which shows the evacuation space of a welding machine. (A) is a front view which shows the retraction | saving aspect of this invention, (b) is a front view which shows the conventional retraction | saving aspect.

Explanation of symbols

2: Support device 3-5: Electrode 10: Terminal detector 12: Arm 13: Sensor 20: Filler hopper 21: Filler spray nozzle 22, 23: Surface flux spray nozzle 30: Copy detector 40: Flux recovery unit 41 : Flux recovery nozzle 61: Steel plate to be welded 70: Backing flux spreader 100, 200: Welding machine

Claims (4)

One or a plurality of torches, a support device that supports the torch and travels, a terminal detector disposed outside one end of the support device in the travel direction, and travel of the support device A flux recovery unit disposed outside the other end of the direction, and the termination detector includes an arm and an arm rotation driving member that is attached to the support device and rotatably supports the arm. A flux sensor that is attached to the tip of the arm and detects a welding end portion, and the flux recovery part is attached to the support device so as to be able to be raised and lowered, and a flux supported by the lifting member A recovery nozzle, and when the end detector detects the end of welding, the arm rotation driving member rotates the arm upward, and the support device is in the retracted position. Traveling welder, characterized by further comprising a control unit to increase the flux collecting nozzle of a member. A scanning detector used to detect the position of the groove by moving along the groove of the weld line and to control the welding wire fed from the torch to move in the groove. And a second elevating member that is attached to the support device so as to be movable up and down and supports the scanning detector, and the control unit detects the second elevating member when the end detector detects a welding end. The traveling type welding machine according to claim 1, wherein the scanning detector is raised. The traveling welding according to claim 2, further comprising a filler nozzle that is attached to the support device in front of the welding direction with respect to the torch and supplies a filler to a groove portion of the weld line. Machine. When the end detector detects the end of welding, the control unit rotates the end detector arm, raises the scanning detector, and fills from the filler nozzle during travel of the support device. The supply stop of the welding, the transition of the welding condition to the terminal welding condition, the supply stop of the welding wire from the torch, the stop of the flux recovery unit, and the travel stop of the support device are performed in this order. 3. The traveling type welder according to 3.

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