JPH06254680A - Tip part processing device for wire welding torch - Google Patents

Abstract

PURPOSE:To unify a mechanism to carry out repairing and exchange work of the wire welding torch tip part to attain miniaturization and to carry out repairing and exchange work while a welding torch is fitted on a robot. CONSTITUTION:The tip part processing device of the wire welding torch which cuts the tip of a welding wire 4 projecting from the tip of the contact tip 1 of the wire welding torch by a fixed cutting die 17 fixed on a base 7 and a movable die 19 rotate by an oscillating actuator 10 of air driving is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for treating the tip of a wire welding torch, and more specifically, it automatically cuts the tip of the welding wire, removes spatter adhering in the gas nozzle, and replaces contact tips. It is related to the device to perform.

[0002]

2. Description of the Related Art FIG. 11 shows a tip portion of a general-purpose wire welding torch which is also applied to the present invention. A conductive cylindrical contact tip 1 is screwed into a barrel 3 of a welding torch by a screw portion 2 at its upper end. Holes 5 through which the welding wire 4 is inserted in the axial center of the barrel 3 and the contact tip 1.
Are formed. Further, the outer peripheral surface of the contact chip 1 is formed in a taper shape which is tapered toward the tip portion, and the outer peripheral surface 1a at the upper part thereof is formed in a polygonal shape, that is, a hexagonal shape in the drawing. Reference numeral 6 denotes a cylindrical gas nozzle provided on the concentric outer periphery of the contact tip 1, and the welding wire 4
When welding is performed by generating an arc between the base metal and the base metal, gas is jetted from the gas nozzle 6 to shut off the welded portion from the air.

When the welding is performed by the wire welding torch, the tip of the welding wire 4 protruding from the tip of the contact tip 1 of the welding torch becomes spherical after the welding, and the arc generation becomes unstable during the next welding. Therefore, it is necessary to cut and remove this tip portion. Further, since spatter at the time of welding adheres to the inside of the gas nozzle 6 and blocks the gas flow path, it is necessary to remove this spatter adhered to the inside of the gas nozzle in order to reduce the adherence of this spatter.

Further, the contact tip 1 is intended for guiding and guiding the welding wire 4 and supplying power to the welding wire, but the pores 5 through which the welding wire 4 of the contact tip 1 passes.
Since the welding wire 4 and the welding wire 4 supply electric power while sliding, the contact tip 1 is severely damaged due to wear and electrolytic corrosion, and the contact tip 1 must be replaced at an appropriate time.

Therefore, conventionally, the spherical shape formed at the tip of the welding wire is made small by controlling the current at the end of welding, but it lacks uniformity and causes a difference in arc start.
The tip of the wire was cut with a manual nipper, an air-driven nipper, or the like to make it uniform. For the treatment of spatter adhered to the inside of the gas nozzle, dip the gas nozzle in the anti-adhesion liquid or apply the anti-adhesion liquid, or rotate the removal tool attached to the motor or vibrator inside the gas nozzle. Had been removed.

Further, when the contact tip 1 is replaced, the gas nozzle 6 is once manually removed to expose the contact tip 1, and then the contact tip 1 is rotated with a spanner or the like to remove it from the barrel 3, and the barrel 3 After the new contact tip 1 was screwed and fixed to, the gas nozzle 6 was attached again.

[0007]

As described above, the welding torch tip processing apparatus for cutting the tip of the welding wire in automatic welding by the robot, removing spatter in the nozzle, applying anti-spatter liquid, etc. It was carried out by each independent device, and a plurality of different drive sources were operated each time. Therefore, if the apparatus becomes complicated, the welding torch itself may be moved when the contact tip is replaced, and the position of the welding line may be displaced.

[0008]

The present invention has been made to solve the above-mentioned problems of the prior art, and integrates a mechanism for repairing or replacing the tip of the wire welding torch. The purpose of the present invention is to provide a welding torch that can be repaired or replaced while the welding torch is still attached to the robot. The tip of the welding wire protruding from the tip of the contact tip is cut by a fixed cutting die fixed to the base and a movable cutting die rotated by an air-driven rocking actuator. Attaching / detaching mechanism that attaches and detaches from the barrel of the wire welding torch by rotating it, and magaji that holds the contact tip on the same circumference through the socket and rotates intermittently. And a magazine guide at the bottom of the magazine for aligning and transporting the sockets, and a socket rotating part installed at a notch of the magazine at an extension of the magazine guide. A tip welding device for a wire welding torch, which comprises a contact tip supply mechanism that is rotated by an air-driven swing actuator to screw the contact tip into a welding torch.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in FIGS. 1 is a plan view of the welding torch tip portion repairing apparatus according to the present invention, and FIG. 2 is II-11 of FIG.
1 is a sectional view taken along line III-III of FIG. 1, FIG. 4 is a sectional view taken along line IV-IV of FIG. 1, FIG. 5 is an exploded perspective view of a cutting tool of the repair device, and FIG. 7 is an exploded perspective view of the contact tip attaching / detaching tool, FIG. 8 is a first action explanatory view of the tool, FIG. 9 is a second action explanatory view of the tool, and FIG. 10 is the same tool. FIG. 11 is a vertical sectional view of the tip of the welding torch applied to the present invention.

In the drawing, reference numeral 7 is a rectangular base in plan view, which is constructed by integrally connecting a pair of upper and lower substrates 7A and 7B with a screw 9 via a pipe spacer 8. Reference numeral 10 denotes an air-driven swing actuator, which is the lower substrate 7B.
A large-diameter spur gear 12 is fixed to the drive shaft 11 that is fixed to the back surface of the upper and lower substrates 7A and 7B, and a cutting mechanism 13 for the welding wire 4 is installed at the upper end of the drive shaft 11. ing.

The cutting mechanism 13 is shown in FIGS. 2, 5 and 6.
As shown in FIG.
And a movable part 15, which is concentric with the drive shaft 11 and is fixed on the upper substrate 7A by a screw 16, while the top surface of the case part 14 is fixedly cut at its eccentric position. A die 17 is provided. This fixed cutting die 17 has a cylindrical shape, and is formed as shown in FIGS.
As shown in FIG. 3, a small hole 18 into which the welding wire 4 can be easily inserted is provided in the center, and the peripheral edge between the small hole 18 and the lower surface of the fixed cutting die 17 forms a cutting blade. The upper end of the small hole 18 tapers toward the upper surface of the cutting die 17 in order to facilitate insertion of the welding wire 4.

On the other hand, the movable portion 15 corresponds to the case portion 1
4 has a columnar shape that is rotatable inside, the lower end of which is fixed to the upper end of the drive shaft 11,
A movable cutting die 19 having the same shape as the fixed cutting die 17 of the case portion 14 is fixed in an eccentric position on the top surface portion of 5 in the opposite direction. When it is not movable, both the cutting dies 17 and 19 of the case portion 14 and the movable portion 15 are moved.
Since the small holes 18 and 20 are coaxially located, the facing surfaces are in close contact with each other, and the welding wire 4 inserted into the upper and lower small holes 18 and 20 is sheared by the rotation of the movable portion 15. .

Reference numeral 21 denotes a spatter removing mechanism, which is shown in FIGS.
As shown in FIG. 3, the removal blade portion 23 in which the cylinder is obliquely cut on the upper surface of the cylindrical fixing portion 22 and the blade portions 23a are formed on the left and right sides thereof is upright. Then, the spatter removing mechanism 2
1 is fixed to the upper end of the driven shaft 24 protruding from the upper substrate 7A by the fixing portion 22, and is urged upward by the spring 25 interposed between the fixing portion 22 and the upper substrate 7A. The driven shaft 24 is rotatably erected vertically between the upper and lower substrates 7A and 7B next to the drive shaft 11 of the actuator 10, and has a small diameter spur gear 26 and a large diameter between the substrates 7A and 7B. The spur gear 27 is fixed, and the small-diameter spur gear 26 meshes with the large-diameter spur gear 12.

Reference numeral 28 is a hollow driven shaft, and as shown in FIG.
Adjacent to the driven shaft 24 of the spatter removing mechanism 21 is rotatably upright between the upper and lower substrates 7A and 7B, and the hollow driven shaft 28 is provided with a small spur gear 29 between the substrates 7A and 7B. It is fixed so as to mesh with a spur gear 27 having a diameter. The hollow driven shaft 28 is biased upward by a spring 30 interposed between a spur gear 29 having a small diameter and the lower substrate 8B.

Reference numeral 31 is a mechanism for attaching and detaching the contact tip 1,
The hollow driven shaft 28 protruding from the upper substrate 7A is fixed to the tip of the hollow driven shaft 28 with a fixing portion 32 and a screw 33, and a cylindrical socket 34 stands upright on the upper surface of the fixing portion 32. The socket 34 has an outer diameter smaller than the inner diameter of the gas nozzle 6, and the inner diameter is a size into which the contact tip 1 can be inserted, and the upper inner surface of the socket 34 is the same as the polygon of the upper outer peripheral portion 1a of the contact tip 1. It is formed into a rectangular tube.

Reference numeral 35 is a bar for removing the contact tip 1,
It is vertically movably inserted into the hollow portion of the driven shaft 28, and its lower end is connected to a kick-out cylinder 36 fixed to the lower substrate 7B. Reference numeral 37 denotes an automatic supply mechanism of the contact tip 1, and as shown in FIGS. 1, 3 and 4, a magazine 39 having a plurality of sockets 38 for supporting the contact tip 1 and the socket 38 are aligned and transferred. Magazine guide 40 and the socket 38
It comprises a socket rotating portion 41 for rotating the contact tip 1 to be screwed into the welding torch, and a driving portion 42 for intermittently rotating the magazine 39.

As shown in FIGS. 4 and 7, the socket 38 has a cylindrical body 38a having a support hole 43 for the contact tip 1 and a lower portion of the cylindrical body 38a having a diameter larger than that of the cylindrical body and on a diameter line. It has a structure in which a head portion 38b provided with a groove 44 is connected, and the upper portion of the support hole 43 is formed in a rectangular tube having the same shape as the outer peripheral portion 1a of the contact chip 1. Further, the magazine 39 is provided with insertion holes 45 for a plurality of sockets 38 at equal intervals on the outer peripheral portion of the disk, and the same number of claw grooves 46 as the insertion holes 45 are formed on the peripheral surface at equal intervals. .

As shown in FIG. 7, the magazine guide 40 is provided with a cylindrical rail 40A on the outer periphery in which the groove 44 of the socket 38 is movably fitted.
A part of 0 is cut out in an arc shape. As shown in FIG. 4, the magazine guide 40 is fixed to the upper substrate 7A by a center hole 40B, which is concentrically inserted into a shaft 47 standing upright on the upper substrate 7A. In addition, the magazine 39
Is rotatably provided on a shaft 47 above the magazine guide 40 by a center hole 39A.

Further, as shown in FIGS. 4 and 7, the socket rotating portion 41 has a shape in which a fitting claw 49 that fits into the groove 44 of the socket 38 is provided on the diameter line of the upper surface of the shaft 48. The shaft 48 is rotatably upright between the upper and lower substrates 7A and 7B at the notch of the magazine guide 40, and is biased upward by a spring 50. Although not shown, the socket rotating portion 41 rotates using the swing actuator 10 as a drive source. Further, the rotating direction of the socket rotating part 41 is the tightening direction of the contact tip 1, and when the socket rotating part 41 is not movable, the longitudinal direction of the fitting claw 49 is aligned with the circumferential line of the rail 40A of the magazine guide 40. Is set to.

Reference numeral 51 is a trunnion cylinder of the drive unit 42, which is rotatably supported by a bearing 52 provided on the side wall of the base 7 by a pivot 53, and the claw groove 46 of the magazine 39 is provided at the tip of the rod. The feed claw 54 that engages with is fixed. In front of the feed claw 54, the feed claw 54
A guide plate 55 that engages the feed claw 54 with the claw groove 46 of the magazine 39 by advancing is fixed to the side wall of the base 7. Note that the reverse rotation preventing claw of the magazine is omitted in the drawing.

Next, the operation of the above embodiment will be described. As shown in FIG. 6, the upper and lower cutting dies 1 of the wire cutting mechanism 13 are used to cut the tip of the welding wire 4.
When the drive shaft 11 of the air-driven swing actuator 10 is rotated after inserting the tip of the welding wire 4 into the small holes 18 and 20 of the holes 7 and 19, the small holes 18 and 20 of the upper and lower cut dies 17 and 19, respectively. Are cut by crossing. After cutting, the swing actuator 10 rotates in the reverse direction and the movable cutting die 19 returns to the original position. In this case, the movable part 1
Since 5 is fixed to the drive shaft 11 of the swing actuator 10, the stop at the original position is surely ensured, and the small holes 18, 2 of the upper and lower cut dies 17, 19 at the original position are secured.
0 matches exactly. A large force is required to cut the wire, but a large force can be obtained because the wire is cut near the axis of the drive shaft 11 of the actuator 10.

Next, when removing the spatter adhering to the inner surface of the gas nozzle 6, the welding torch is lowered onto the base 7 and the removing blade portion 23 of the spatter removing mechanism 21 is inserted into the gas nozzle 6 and shaken. When the dynamic actuator 10 is driven, the driven shaft 24 is rotated by the meshing of the large-diameter spur gear 12 and the small-diameter spur gear 26 with the oscillating angle increased by the ratio, and the oscillating actuator 10 is oscillated. Even if the motion is less than once, it rotates multiple times. Therefore, the removal blade portion 23 fixed to the upper end portion rotates at high speed, and the spatter attached to the inner surface of the gas nozzle 6 is removed. If the rotation direction of the spatter removing mechanism 21 during operation is the same as the tightening direction of the mounting screw of the gas nozzle 6, the gas nozzle 6 itself will not loosen. Although not shown, the driven shaft 24 of the spatter removing mechanism 21 can be hollow, and the exhaust of the actuator 10 can be used to spray the spatter adhesion preventing liquid onto the inner surface of the gas nozzle 6 at the same time as removing the spatter.

When replacing the contact tip 1, first, when removing the contact tip 1 from the barrel 3,
The tip of the welding wire 4 is previously retracted to the tip of the barrel 3 by a general-purpose means. Then, as shown in FIGS. 2 and 8, the contact tip 1 is inserted into the socket 34 of the attachment / detachment mechanism 31, and the swing actuator 10 is driven in a pressed state so as to compress the spring 30 to rotate the socket 34. For example, as shown in FIG. 9, when the polygonal outer peripheral portion 1 a of the contact tip 1 and the rectangular tube portion of the socket 34 are united, the socket 34 is pushed up by the elastic force of the spring 30. As a result, the outer peripheral portion 1a of the contact chip 1 and the rectangular tube portion of the socket 34 are fitted to each other, and the contact chip 1
Is rotated so that the screw portion 2 is completely removed from the barrel 3. In this case, since the small-diameter spur gear 29 meshes with the large-diameter spur gear 27, the hollow driven shaft 28 of the small-diameter spur gear 29 is further rotated by the ratio of the large-diameter spur gear 27. Will be done.

Then, the removal of the old contact chip 1 left in the socket 34 is performed as shown in FIG.
The exclusion bar 35 may be pushed up by driving the kickout cylinder 36 and the contact tip 1 may be pushed out of the socket 34. As described above, the contact tip 1 may be pushed out by jetting compressed air instead of the mechanical method using the kickout cylinder 36 and the exclusion bar 35.

Next, in order to mount the new contact tip 1 on the barrel 3 from which the old contact tip 1 has been removed, as shown in FIG.
4 with the screw part 2 upwards,
The socket 38 is turned by hand as shown in FIG.
The groove 44 formed in b is fitted in the cylindrical rail 40A of the magazine guide 40 and set in the insertion hole 45 of the magazine 39.

When the feed claw 54 of the trunnion cylinder 51 of the drive unit 37 is advanced, the feed claw 54 strikes the guide plate 55 and the trunnion cylinder 51 rotates about the pivot 53 as a fulcrum. It engages with the claw groove 46 of the magazine 39. Then, when the feed claw 54 is retracted, the magazine 39 rotates by one pitch, and the groove 4 of the socket 38 is rotated.
4 moves from the rail 40A of the magazine guide 40 onto the fitting claw 49 of the socket rotating part 41, and the socket rotating part 41
Located on the same axis.

Therefore, the welding torch is advanced over the socket 38, the gas nozzle 6 is fitted in the socket 38, and the lower end of the barrel 3 in the gas nozzle 6 is attached to the screw portion 2 of the contact tip 1 in the socket 38 by the spring 50. Press against it.
Next, when the socket rotating portion 41 is rotated in the tightening direction,
The screw portion 2 of the contact tip 1 is screwed and fixed to the barrel 3. In this case, the fitting claw 49 of the socket rotating portion 41 is in a position where it is securely engaged with the groove 44 of the socket 38, that is, the longitudinal direction of the fitting claw 49 is the circumferential line of the rail 40A of the magazine guide 40. It is necessary to set them so that they coincide with each other, but since this socket rotating portion 41 is driven by the swing actuator 10, its stop position exactly coincides with the direction of the groove 44 of the socket 38.

If the welding torch is withdrawn after mounting the contact tip 1 and the magazine 39 is fed by one pitch, the contact tip 1 can be continuously replaced. When the new contact tip 1 is mounted, the tip of the welding wire 4 is set to project from the tip of the contact tip 1 by a general-purpose means.

[0029]

As described above, the apparatus for treating the tip portion of the wire welding torch according to the present invention includes the tip of the welding wire protruding from the tip of the contact tip of the wire welding torch.
Since the fixed cutting die fixed to the base and the movable cutting die rotated by the air-driven swing actuator are used for cutting, the small holes of both cutting dies are exactly aligned with each other. Therefore, the tip of the wire is not damaged and the wire wire is not displaced, and automation can be achieved. Also, an attaching / detaching mechanism for rotating the contact tip to attach / detach it from the barrel of the wire welding torch, a magazine for holding the contact tip on the same circumference through the socket and rotating intermittently, and the socket at the lower part of the magazine. And a socket rotating part installed in the notch of the magazine in an extension part of the magazine guide, and the socket rotating part is rotated by an air-driven rocking actuator to Since it is composed of a contact tip supply mechanism that screws the contact tip to the welding torch, it has a simple mechanism and the entire device is small, so it can be installed in places where it is difficult to take up the installation space. In fact, the socket rotating part is rotated by the air-driven swing actuator, Operation of the chip supply mechanism is reliable, there are various effects such it is possible to improve the quality and reliability of the continuous welding by a robot.

[Brief description of drawings]

FIG. 1 is a plan view of a tip processing device for a wire welding torch according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is an exploded perspective view of a cutting tool.

FIG. 6 is an operation explanatory view of the tool.

FIG. 7 is an exploded perspective view of a contact tip attaching / detaching tool.

FIG. 8 is a first action explanatory diagram of the tool.

FIG. 9 is a second operation explanatory diagram of the tool.

FIG. 10 is a third operation explanatory view of the tool.

FIG. 11 is a vertical cross-sectional view of the tip of the wire welding torch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Contact tip 2 Screw part 3 Barrel 4 Welding wire 6 Gas nozzle 7 Base 10 Air driven swing actuator 11 Drive shaft 12 Large diameter spur gear 13 Cutting mechanism 14 Case part 15 Moving part 17 Fixed cutting die 18 Small hole 19 Movable cut Die 20 Small hole 21 Spatter removal mechanism 22 Fixed part 23 Removal blade part 23a Blade part 24 Driven shaft 25 Spring 26 Small diameter spur gear 27 Large diameter spur gear 28 Hollow driven shaft 29 Small diameter spur gear 30 Spring 31 Attachment / detachment mechanism 32 Fixed part 33 screw 34 socket 35 exclusion bar 36 kickout cylinder 37 automatic supply mechanism 38 socket 38a cylindrical body 38b head 39 magazine 39A center hole 40 magazine guide 40A cylindrical rail 40B center hole 41 socket rotating part 42 drive part 43 support hole 44 groove 45 Insertion hole 46 Claw Groove 49 Fitting Claw 50 Spring 51 Trunnion Cylinder 52 Bearing 53 Pivot 54 Feeding Claw 55 Guide Plate

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[Procedure amendment]

[Submission date] January 26, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

The present invention has been made to solve the above-mentioned problems of the prior art, and integrates a mechanism for repairing or replacing the tip of the wire welding torch. The purpose of the present invention is to provide a welding torch that can be repaired or replaced while the welding torch is still attached to the robot. The tip of the welding wire protruding from the tip of the contact tip is cut by a fixed cutting die fixed to the base and a movable cutting die rotated by an air-driven rocking actuator. When a gear is attached to a hollow rotary shaft that is vertically supported so as to be freely rotatable and is urged upward in the axial direction, a wire welding torch contour is attached to the upper end of the hollow rotary shaft. A socket with a hole of the same shape as the polygonal outer circumference of the chip and an outer diameter smaller than the inner diameter of the gas nozzle is mounted, and the hollow rotary shaft is rotated by a pneumatically driven rocking actuator through a gear attached to the drive shaft. The contact tip is screwed off from the barrel of the wire welding torch according to the present invention.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

[0029]

As described above, the apparatus for treating the tip portion of the wire welding torch according to the present invention includes the tip of the welding wire protruding from the tip of the contact tip of the wire welding torch.
Since the fixed cutting die fixed to the base and the movable cutting die rotated by the air-driven swing actuator are used for cutting, the small holes of both cutting dies are exactly aligned with each other. Therefore, since the tip of the wire will not be damaged or the wire will not be misaligned, correction work is unnecessary, and the tip of the welding wire is automatically cut without removing the gas nozzle from the barrel. Therefore, continuous welding by a robot becomes possible. Further, when a gear is attached to a hollow rotary shaft which is vertically supported by a base so as to be freely rotatable and is urged upward in the axial direction, many contact tips of a wire welding torch are attached to the upper end of the hollow rotary shaft. By mounting a socket having a hole having the same shape as the outer periphery of the prism and an outer diameter smaller than the inner diameter of the gas nozzle, and rotating the hollow rotary shaft through a gear attached to the drive shaft by an air-driven swing actuator, Since the contact tip is screwed out of the barrel of the wire welding torch, the contact tip and the socket can be fitted smoothly. Therefore, the contact tip can be reliably unscrewed, and the mechanism is simple so that the device can be downsized and the durability can be improved.

Claims (2)

[Claims] 1. A tip of a welding wire protruding from a tip of a contact tip of a wire welding torch is cut by a fixed cutting die fixed to a base and a movable cutting die rotated by an air-driven rocking actuator. Wire welding torch tip processing device. 2. A detaching mechanism for rotating the contact tip to attach and detach it from the barrel of the wire welding torch, a magazine for holding the contact tip on the same circumference through a socket and rotating intermittently, and a magazine at the bottom of the magazine. It consists of a magazine guide for aligning and transferring the sockets and a socket rotating part installed in the cutout part of the magazine in the extension part of the magazine guide. The socket rotating part is rotated by an air-driven rocking actuator. And a contact tip supply mechanism for screwing the contact tip into a welding torch, and a tip processing device for a wire welding torch.