JP2011200908A - Welding torch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding torch which has simplified attachable/detachable structure, thereby enabling a torch body to be replaced by a simple operation.SOLUTION: The welding torch has a connector member 5 and a connector case 7 to be connected to an inner pipe of a pipe for a torch at the root part of the welding torch, and a corn-shaped fitting hole 5a is formed in a fore end of the connector member 5. The torch body 2A includes a tip body 20 having a corn-shaped fitting part 29 on a terminating end thereof. The torch body 2 slides a lock member 9 while the corn-shaped fitting part 29 at the terminating end is fitted in the corn-shaped fitting hole 5a of the connector member 5, and a small diameter hole 9c of a lock opening part 9a is fitted in a lock groove 28 of the tip body 20 to lock the fitting state of the corn-shaped fitting part 29 and the corn-shaped fitting hole 5a. When the lock member 9 slides in the opposite direction to the above, the locked state is unlocked, and the torch body 2 is detached from the connector member 5.

Description

  The present invention relates to a welding torch in which a torch body including a contact tip and a tip body of a welding torch can be easily replaced using a simple structure attaching / detaching mechanism.

  A welding torch having a tip body with a contact tip attached to the tip and a tip nozzle attached via an insulator so as to cover the tip body and the contact tip is used as a welding torch for carbon dioxide welding etc. ing.

  This type of welding torch performs welding while supplying a welding wire (consumable electrode) and shielding gas to the contact tip through a through-hole penetrating the inside of the welding torch. If it is performed, spatter generated by welding adheres to the tip nozzle, or the ejection hole from which the shielding gas is ejected is likely to be clogged due to foreign matters or the like, and thereafter proper welding cannot be performed.

  For this reason, when continuing welding work, disassemble the welding torch every predetermined time, remove the tip nozzle, tip body, contact tip, insulator and other parts, clean the inside of the welding torch, or damaged parts After replacing the parts, it is necessary to reassemble the parts, and the disassembling / assembling work takes a considerable amount of man-hours and work time.

  Therefore, conventionally, in Patent Document 1 below, a welding torch in which the tip of the welding torch can be replaced relatively easily has been proposed.

JP 2003-145272 A

  Although this type of conventional welding torch can be replaced by removing the tip, when removing the tip of the welding torch, the tip is fastened and fixed by the sleeve, so the sleeve is turned and loosened. After replacing the inside of the sleeve, it is necessary to reassemble the parts and turn the sleeve again to tighten it. Further, in the structure in which the tightening member is tightened with the tightening bolt, it is necessary to loosen the tightening nut using the tightening tool and turn it after the replacement to tighten it.

  On the other hand, when welding is performed with a welding torch attached to a welding robot, it is desirable to automate the replacement work of the welding torch. However, if the replacement work involving the rotation operation of the sleeve and the tightening bolt is automated, There is a problem that the structure of the system is very complicated, and the replacement time is long.

  The present invention solves the above-described problems, and an object thereof is to provide a welding torch capable of simplifying the attachment / detachment structure and exchanging the torch body by a simple operation.

The welding torch according to the present invention is
In a welding torch in which a tip body with a contact tip attached to the tip of the torch body is provided, and welding is performed by supplying a welding wire and a shielding gas to the tip body of the torch body.
A connector member provided with a through hole in the axial direction is fastened and fixed to the tip of the torch pipe by a fastening member, and a cone fitting hole is provided at the axial center position of the tip of the connector member. A connector case is fitted to the outer periphery so as to be movable in the axial direction, and a plate-like slit hole is formed in the connector case at the edge position on the cone fitting hole side of the connector member in a direction perpendicular to the shaft. And
A plate-like lock member is slidably inserted into the slit hole, and the lock member is provided with a lock opening made up of a large diameter portion and a small diameter portion, and the tip of the connector member is placed in the connector case. A spring member that is urged to be pressed against the lock member is disposed;
A cone fitting portion that is fitted into a cone fitting hole of the connector member is provided at a distal end portion of the tip body of the torch body, and a lock opening portion of the lock member is provided at an outer periphery of a base portion of the cone fitting portion. An annular lock groove that fits is formed,
The torch body has the cone fitting portion fitted in the cone fitting hole of the connector member, and the lock member is slid to fit the small diameter hole of the lock opening into the lock groove. When the cone fitting portion of the tip body is locked in the cone fitting hole and the lock member is slid to slide the large-diameter hole of the lock opening to the lock groove side, the torch The main body is characterized in that the lock of the cone fitting portion of the tip body is released and detached from the connector member.

  According to this invention, when replacing the torch body of the welding torch, if the lock member is pushed and slid to the open side, the large-diameter hole of the lock opening slides to the lock groove side, and the lock by the lock member is released. Then, the cone fitting portion of the tip body is separated from the cone fitting hole of the connector member, and the torch body is detached from the base portion of the welding torch. When attaching a new torch body, insert the cone fitting hole of the connector member into the cone fitting part of the tip body of the new torch body, and push the lock member to the lock side to slide it. The small-diameter hole is fitted into the lock groove, the cone fitting portion of the tip body is locked in the cone fitting hole, and the torch body is replaced.

  Therefore, since the torch body can be attached and detached with a simple operation by simply pushing and sliding the lock member, for example, when the welding torch is attached to the robot arm of the welding robot, the operation or replacement of the welding robot is performed. The lock member can be pushed by the operation of the mechanism to remove the torch body, and can be replaced with a clean torch body.

  Here, it is preferable to provide a small-diameter portion for gripping on the tip end side of the lock groove in the chip body. According to the present invention, when exchanging the torch main body, the exchanging operation can be easily performed by causing the automatic exchanging device or the like to securely grasp the small diameter portion of the chip body of the torch main body to be exchanged.

  Preferably, the lock member is provided with a guide hole, a guide pin is provided at a corresponding position of the connector case so as to be engaged with the guide hole, and the sliding of the lock member is guided by the guide hole and the guide pin. According to the present invention, the lock member can be stably slid without looseness.

  According to the welding torch of the present invention, the main body of the torch can be easily replaced by a simple replacement mechanism such as an automatic changer, and the attachment / detachment mechanism of the welding torch has a small number of parts and has a simple structure. Can do.

It is a right view of the welding torch which shows one Embodiment of this invention. It is an expansion right side view of the welding torch. It is an enlarged right view of the state which removed the torch body of the welding torch. (A) is a right side view of the chip body, (b) is a bb cross-sectional view thereof, and (c) is a cc cross-sectional view thereof. (A) is a right side view of the connector case, (b) is a rear view of the connector case, (c) is a cc sectional view thereof, and (d) is a dd sectional view thereof. (A) is a front view of a lock member, (b) is the bb sectional drawing. (A) is the right view of a fastening member, (b) is the bb sectional drawing. (A) is a right side view of the connector member, (b) a rear view of the connector member, and (c) is a front view of the connector member. It is sectional drawing of the state which assembled | attached the connector member in the connector case. (A) is sectional drawing of the state which couple | bonded the connector member and the chip body, and was locked by the locking member, (b) is sectional drawing of the state which cancel | released the lock | rock.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the welding torch 1 has a torch pipe 3 whose base is covered with an insulating coating, a conductive inner pipe 4 inserted into the torch pipe 3, and a tip of the inner pipe 4. The connector member 5 connected to and fixed by the tightening member 6, the connector case 7 attached to cover the tip of the connector member 5, and the slit hole 7 b provided in the connector case 7 are slidably inserted. The plate-shaped lock member 9 is provided.

  As shown in FIG. 3, the torch body 2 is attached to the base of the welding torch 1 so as to be detachable and replaceable. The torch body 2 is attached by fitting the cone fitting portion 29 of the tip body 20 provided at the end of the torch body 2 into the cone fitting hole 5a of the connector member 5 and locking it by pushing the lock member 9. The torch body 2 is detached by releasing the lock by pushing the lock member 9 in the reverse direction.

  As shown in FIG. 8, the connector member 5 provided at the base portion of the welding torch 1 is formed in a tubular shape whose outer diameter is changed stepwise by a conductive metal, and has a truncated cone-shaped cone fitting in the axial direction of the tip portion. A joint hole 5a is formed, and a shaft hole 5b is formed through the shaft core position. The outer peripheral portion of the connector member 5 is formed with a large diameter portion 5c, a medium diameter portion 5d, and a small diameter portion 5e from the front end side, and the small diameter portion 5e is fitted inside the tightening member 6 and tightened together. It is fastened and fixed in a state where it is connected to the end of the inner pipe 4 fitted in the attaching member 6.

  As shown in FIG. 7, the fastening member 6 is formed by penetrating a cylindrical space 6a in the axial direction therein, and forming a slit 6b from the cylindrical space 6a along the axis and in the outer peripheral direction. Two screw holes for fastening bolts are formed on both sides of 6b. When attaching the connector member 5 to the tip of the inner pipe 4, the inner pipe 4 and the connector member 5 are inserted into the cylindrical space 6 a of the fastening member 6, and in this state, the two fastening bolts 11 are fastened. Screwing into the screw hole of the member 6, the end portions of the inner pipe 4 and the connector member 5 are tightened and fixed by the tightening member 6. The inside of the conductive inner pipe 4 communicates with the shaft hole 5b of the connector member 5, and the welding wire and the shield gas pass through the inside.

  A connector case 7 is slidably covered in the axial direction on the large diameter portion 5c and the medium diameter portion 5d of the connector member 5 so as to cover the outer peripheral portion from the outside. As shown in FIG. 5, the connector case 7 is formed in a cylindrical shape having a large-diameter portion 7a at the tip of a metal cylinder. The large-diameter portion 7a has a direction perpendicular to the axial direction of the cylinder (connector case). 7 is formed in a plate-shaped slit hole 7b. The lock member 9 shown in FIG. 6 is slidably inserted into the slit hole 7 b, and the cone fitting portion 29 of the chip body 20 fitted into the cone fitting hole 5 a of the connector member 5 is connected to the lock member 9. It is structured to lock by.

  As shown in FIG. 9, the coil spring 12 is disposed in the connector case 7 so as to be externally fitted to the middle diameter portion 5 d of the connector member 5, and the distal end of the connector member 5 is caused by an appropriate spring force of the coil spring 12. Is pressed against the lock member 9. As shown in FIGS. 5 and 9, the front surface of the connector case 7 is greatly opened in a circular shape, and the end surface of the large-diameter portion 5c of the connector member 5, that is, the cone fitting hole 5a is exposed in the front opening.

  As shown in FIG. 6, the lock member 9 is formed by providing a plate-shaped member with a substantially diamond-shaped lock opening 9 a, and the lock opening 9 a has a large size for releasing the lock of the cone fitting portion 29. A structure in which the diameter hole 9b and the small diameter hole 9c for locking the cone fitting portion 29 are continuously provided, and the lock member 9 is moved in a direction perpendicular to the axis of the connector case 7 to lock and unlock. It is.

  That is, as shown in FIG. 10, the inner diameter of the small-diameter hole 9c of the lock opening 9a of the lock member 9 is formed such that the lock groove 28 of the chip body 20 can be closely fitted, and the lock opening 9a The inner diameter of the large-diameter hole 9b is formed such that the base portion of the cone fitting portion 29 of the tip body 20 can be loosely inserted. As a result, as shown in FIG. 10B, when the end of the lock member 9 is pushed and slid and the large-diameter hole 9b is aligned with the axial center position, the cone fitting portion 29 of the tip body 20 is locked. It can be fitted into the cone fitting hole 5 a of the connector member 5 through the lock opening 9 a of the member 9. In this state, if the cone fitting portion 29 of the tip body 20 is fitted in the cone fitting hole 5a of the connector member 5 in the contact case 7, the torch body 2 is the base portion of the welding torch. Leave.

  On the other hand, as shown in FIG. 10A, the end of the lock member 9 is moved in a state where the cone fitting portion 29 of the chip body 20 is fitted in the cone fitting hole 5 a of the connector member 5 in the connector case 7. When the small-diameter hole 9c is pushed and slid in the opposite direction and the small-diameter hole 9c is aligned with the axial center position, the peripheral edge of the small-diameter hole 9c of the lock opening 9a of the lock member 9 is locked in the lock groove 28 of the tip body 20. The chip body 20 is locked to the connector member 5.

  Two guide holes 9d are formed in the lock member 9 in parallel with the longitudinal direction thereof, and two guide holes are inserted from the distal end side of the connector case 7 in a state where the lock member 9 is inserted into the slit hole 7b of the connector case 7. The pin 13 is driven in the axial direction, and the guide pin 13 is inserted through the guide hole 9d as shown in FIG. Due to the engagement between the guide pin 13 and the guide hole 9d, when the lock member 9 is slid in the slit hole 7b of the connector case 7 as shown in FIG. 10, the lock member 9 moves stably within a predetermined range. Yes.

  As shown in FIG. 4, the tip body 20 of the torch body 2 is formed of a conductive metal tube body having a large diameter portion 20 a and a small diameter portion 20 b having a shaft hole 31 at the axial center position. A chip mounting hole 24 for screwing the contact chip 21 is provided. Further, a truncated cone-shaped cone fitting portion 29 is formed at the end of the tip body 20, and a lock groove 28 is formed adjacent to the cone fitting portion 29 so as to fit the lock member 9 as an annular groove. ing.

  The tip side of the tip body 20 is formed as a small-diameter portion 20b, but a large-diameter portion 20a is provided near the end of the intermediate portion of the tip body 20, and a cone fitting portion 29 is provided at the rear of the large-diameter portion 20a. Protrusively provided. The large-diameter portion 20 a is formed with a gripping small-diameter portion 26 with a step, and a flange portion 27 is formed between the locking small-diameter portion 26 and the lock groove 28 on the terminal side. The gripping small-diameter portion 26 is a portion to be gripped because the holding arm such as an exchange device has the torch body 2 when the torch body 2 is replaced.

  As shown in FIG. 4, a male screw portion 25 is formed in the small diameter portion 20 b of the chip body 20, and the screw portion is screwed into the male screw portion 25 to be provided inside the insulator 23, and the insulator 23 is attached to the chip body 20. The small diameter portion 20b is screwed near the large diameter portion 20a. In addition, a plurality of shield gas ejection holes 32 are formed in the radial direction in the small diameter portion 20b, and the ejection holes 32 are formed in a space between the tip nozzle 22 that is mounted so as to cover the outside of the chip body 20. Shield gas is allowed to flow through. Further, a tip mounting hole 24 is provided with a female screw at the tip of the tip body 20, and the contact tip 21 is screwed into and attached to the tip mounting hole 24 at the tip of the tip body 20 as shown in FIG. 2.

  The tip nozzle 22 is formed in a cylindrical shape, and a female thread portion is provided on the inner side in the vicinity of the end portion. On the other hand, a male screw portion that is screwed into the female screw portion is formed on the outer peripheral portion of the insulator 23. The tip nozzle 22 is attached so as to cover the contact tip 21 by screwing the female screw portion into the screw portion of the insulator 23 and screwing it into the tip portion of the tip body 20.

  The welding torch 1 having the above configuration is used with the end of the torch pipe 3 attached to a robot arm of a welding robot or the like. The welding operation by the welding torch 1 is performed for a long time or a predetermined time, and spatter adheres to the tip body 20 and the contact tip 21 of the torch main body 2 or foreign matter adheres to the ejection hole 32 of the shield gas. If the shielding gas ejection failure occurs, the torch body 2 is replaced. In the state where the torch body 2 is fixed to the welding torch 1, as shown in FIG. 10A, the small diameter hole 9 c of the lock member 9 is pushed into the lock groove 28, and the end of the chip body 20 is connected to the connector member 5. It is locked to.

  When the replacement work is started, the welding torch 1 is inserted into a replacement device (not shown), and the front end of the lock member 9 is slid by pushing the tip of the lock member 9 to the open side as shown in FIG. Let When the operator manually replaces the torch body 2, the tip of the lock member 9 is pushed and slid in the same direction.

  At this time, as shown in FIG. 10B, the large-diameter hole 9b of the lock opening 9a of the lock member 9 slides toward the lock groove 28 of the chip body 20, and the lock by the lock member 9 is released. As a result, the cone fitting portion 29 of the tip body 20 is separated from the cone fitting hole 5 a of the connector member 5, and the torch body 2 is detached from the base portion of the welding torch 1. At this time, if a gripping arm (not shown) provided in the exchange device or the like grips the gripping small-diameter portion 26 of the torch body 2 and pulls the base portion of the welding torch 1 from the exchange device in this state, the welding torch 1 The torch body 2 can be reliably detached from the base part.

  Thereafter, the base portion of the welding torch 1 is moved to fit the cone fitting hole 5a of the connector member 5 into the cone fitting portion 29 at the end of the tip body 20 of the new torch body 2 to be replaced. At this time, even if the axis of the tip body 20 of the torch body 2 and the axis of the connector member 5 are slightly deviated from each other, the truncated cone-shaped cone fitting portion 29 is inserted into the cone fitting hole 5a. Thus, the tip body 20 and the connector member 5 can be easily fitted and connected.

  In this state, the lock member 9 is pushed and slid to the lock side as shown in FIG. Accordingly, the small diameter portion 9c of the lock opening 9a of the lock member 9 is fitted into the lock groove 28 of the chip body 20, and the cone fitting portion 29 of the chip body 20 is fitted into the cone fitting hole 5a of the connector member 5. The torch body 2 is fixed to the base of the welding torch and the exchange is completed.

  In this way, the torch body 2 can be attached and detached with a simple operation by simply pushing and sliding the lock member 9, so that, for example, when the welding torch is attached to a robot arm of a welding robot, However, by the operation of the welding robot or the operation of the exchange mechanism, the lock member 9 can be pushed to remove the torch body 2 and exchange it with a clean torch body 2.

DESCRIPTION OF SYMBOLS 1 Welding torch 2 Torch body 3 Torch pipe 4 Inner pipe 5 Connector member 5a Cone fitting hole 5b Shaft hole 5c Large diameter part 5d Medium diameter part 5e Small diameter part 6 Tightening member 6a Cylindrical space 6b Slit 7 Connector case 7a Large diameter Part 7b Slit hole 9 Lock member 9a Lock opening 9b Large diameter hole 9c Small diameter hole 9d Guide hole 11 Tightening bolt 13 Guide pin 20 Tip body 20a Large diameter part 20b Small diameter part 21 Contact tip 22 Tip nozzle 23 Insulator 24 Tip mounting hole 25 Threaded portion 26 Gripping small diameter portion 27 Flange portion 28 Lock groove 29 Cone fitting portion 32 Ejection hole

Claims (3)

In a welding torch in which a tip body with a contact tip attached to the tip of the torch body is provided, and welding is performed by supplying a welding wire and a shielding gas to the tip body of the torch body.
A connector member provided with a through hole in the axial direction is fastened and fixed to the tip of the torch pipe by a fastening member, and a cone fitting hole is provided at the axial center position of the tip of the connector member. A connector case is fitted to the outer periphery so as to be movable in the axial direction, and a plate-like slit hole is formed in the connector case at the edge position on the cone fitting hole side of the connector member in a direction perpendicular to the shaft. And
A plate-like lock member is slidably inserted into the slit hole, and the lock member is provided with a lock opening made up of a large-diameter hole and a small-diameter hole, and the tip of the connector member is placed in the connector case. A spring member that is urged to be pressed against the lock member is disposed;
A cone fitting portion that is fitted into a cone fitting hole of the connector member is provided at an end portion of the tip body of the torch body, and a lock opening portion of the lock member is provided at an outer periphery of a base portion of the cone fitting portion. An annular lock groove that fits is formed,
The torch body has the cone fitting portion fitted into the cone fitting hole of the connector member, and the lock member is slid to fit the small diameter hole of the lock opening into the lock groove. When the cone fitting portion of the tip body is locked in the cone fitting hole, the lock member is slid and the large-diameter hole of the lock opening is slid toward the lock groove. The welding torch characterized in that the torch body is released from the connector member by unlocking the cone fitting portion of the tip body.   The welding torch according to claim 1, wherein a small-diameter portion for gripping is provided on a tip end side of the lock groove in the tip body.   The lock member is provided with a guide hole, and a guide pin is provided at a corresponding position of the connector case so as to be engaged with the guide hole, and the slide of the lock member is guided by the guide hole and the guide pin. The welding torch according to claim 1.

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