JP4896847B2 - Forced pressure feeding chip assembly and forced pressure feeding torch - Google Patents

Description

  The present invention relates to a forced pressurizing power supply chip assembly and a forced pressurization power supply torch.

  FIG. 5 is a system diagram showing a general configuration of a welding robot when an articulated robot as an industrial robot is used. In the figure, a welding torch 13 as an end effector is attached to the tip of a wrist 12 provided at the end of a manipulator 11 composed of a plurality of arms, and a welding wire wound around a wire reel 14 is connected to a conduit pipe 15. And is fed to the welding torch 13 by a wire feeder 16 attached to the manipulator 11. The welding wire is guided from the wire reel 14 to the wire feeder 16 by a conduit pipe 15, and from the wire feeder 16 to the welding torch 13 is guided by a one-wire power cable 26 (ie, torch cable). Are sent.

  Then, electric power is supplied from the welding power supply device 17 to the welding torch 13 via the one-wire power cable 26, and the shielding gas is supplied from the gas cylinder 18 to the welding torch 13. A command signal is input from the teach pendant 19 to the robot control device 10, and a signal from the robot control device 10 is input to the manipulator 11 to rotate the six axes including the first to sixth axes of the manipulator 11. The tip position of the welding torch 13 is controlled.

  The structure of the conventional welding torch 13 is configured as shown in FIG. In the figure, a power feed tip 22 is attached to a tip 21 a of a tip body 21 attached to a torch body 20 of a welding torch 13. A circular hole for inserting the wire W is provided in the central axis portion of the power supply chip 22. Power is supplied to the wire W when the power supply chip 22 and the wire W are inscribed. The nozzle 23 surrounds the power feed tip 22 and the orifice 24 arranged so as to substantially cover the peripheral surface of the tip end portion of the tip body 21.

  The shield gas supplied from the gas cylinder 18 is ejected through a hole of an orifice 24 provided at the tip of the tip body 21 to shield the arc, the molten pool and the surrounding area from nitrogen and oxygen in the atmosphere. Further, an insulating bush 25 is disposed around the center portion of the chip body 21.

  By the way, power is supplied to the wire W when the wire W comes into contact with the power feed tip 22 attached to the tip of the welding torch 13, but if the bending of the wire W is not constant, the wire W and the power feed tip 22 are not connected. The contact point is not constant. As a result, the protruding length of the wire, which is the length from the contact point between the wire W and the power feed tip 22 to the tip of the wire W, varies. Due to this variation, the resistance heat generation of the protruding length portion of the wire varies, the wire melting amount changes, the arc length varies, and the welding result does not become constant.

  Further, when the bending wrinkle of the wire W stored in the pack wire is small, the contact point between the wire W and the power supply chip 22 varies, and thus a spark may occur between the wire W and the inner surface of the power supply chip 22. . In this case, the inner surface of the power supply tip 22 is roughened by the spark and is worn by sliding contact with the wire, thereby shortening the life of the power supply tip 22 and increasing the number of replacements of the power supply tip 22. Originally, the robot is required to reduce the number of times of operation stop of the robot due to replacement of the power supply chip 22 or the like, but this request cannot be satisfied.

  Therefore, in Patent Document 1, a leaf spring is provided so as to face the welding wire hole in the contact tip, and the wire is elastically pressed from one side with respect to the wire inserted into the welding wire hole by the leaf spring. The contact point between the contact tip and the contact tip is made constant.

  Further, at the time of wire feeding, the wire is fed from the wire feeder through the liner inside the conduit to the power feed tip. At this time, not a little friction is generated on the wire. Due to this friction, the state of the wire surface is damaged, and in some cases, it is scraped, and at this time, shaving powder is generated. The scraped shavings are sent to the tip end through the conduit. Usually, there is almost no clearance (about 0.1 mm) in the wire insertion portion of the chip, and when this shaving powder enters the wire insertion portion of the chip, the feeding resistance increases, and normal wire feeding cannot be performed. Here, if the hole diameter of the wire insertion part is increased and the clearance is increased, the clogging due to the wire wear powder will be reduced, but since the gap between the wire and the chip is wide, stable power supply will not be performed, and power supply performance will deteriorate and teaching The welding conditions are not the same, the arc becomes unstable, and proper welding is not performed.

Therefore, in Patent Document 2, the contact tip is equally divided into a plurality along the axial direction, and the base portion is fixed with a fixing ring so that the divided portions are integrated. The tip end portion of the tip is elastically attached by a tightening ring so that the slit gap formed in FIG. With this configuration, the slit gap formed between the tip end portions is tightened by the tightening ring, whereby the diameter of the wire guide hole of the contact chip is made smaller than the wire diameter, and the wire inserted into the wire guide hole Is held in contact with the entire circumference of the guide hole. Further, a spiral groove is provided on the inner surface of each divided portion, and the shaving powder is discharged by the groove to prevent clogging with the shaving powder.
Japanese Patent Laid-Open No. 10-34441 JP-A-10-193123 (paragraphs “0011 to 0012”)

  However, in the contact tip of Patent Document 1, since the wire is elastically pressed to the welding wire hole from one side by a leaf spring, there is a problem in that the tip is unevenly worn and any aim is generated. In addition, since the power supply to the wire is performed only from one side of the wire, the uneven wear increases at an accelerated rate due to the temperature rise of the chip when a high current is supplied, and the life of the chip is shortened. . Further, the leaf spring is vulnerable to heat, and there is a problem that the elastic force is not stable and the power feeding becomes unstable under an environment where the temperature rises by several hundred degrees Celsius.

  In the contact chip of Patent Document 2, the entire contact chip is equally divided along the axial direction. For this reason, when the screw part of the base part bundled with the fixing ring is screwed to the torch body, the screw part may be divided, so that the screwing may be sweetened. In addition, since the contact tip is equally divided as a whole, there is a risk that it will not be guaranteed that the center can be reliably taken when bundled and integrated, and there is a certain amount of wrapping. As a result, an urging force is applied toward one direction, and the divided portion may not be stably positioned.

  In addition to the above, the factors that determine the life of the power supply tip are also greatly affected by heat generated during welding and wire scraping generated during wire feeding. It is said that the heat generated at the welding point is several thousand degrees Celsius to several tens of thousands degrees Celsius. Due to this radiant heat, the tip of the power feed tip is exposed to a high temperature and rises from several hundred degrees C. to nearly 1000 degrees C. The power supply chip generally uses a copper alloy or the like, but as the chip temperature rises, the surface hardness decreases and softens. Therefore, there is a problem that the wear of the chip also increases at an accelerated rate.

  An object of the present invention is to provide a forced pressurization power supply tip assembly and a forced pressurization power supply torch which can suppress the temperature rise of the tip without directly generating heat generated during welding.

  Furthermore, the present invention prevents the arcing inside the chip by forced wire pressurization and can perform stable power supply, and also can suppress the wear of the chip. An object of the present invention is to provide a forced pressurizing power supply tip assembly and a forced pressurization power supply torch that can be stably positioned when attached to a body.

  In order to solve the above-mentioned problems, the invention according to claim 1 is provided in such a manner that it is detachably attached to the tip body of the welding torch and has a first wire insertion hole in the center along the axial direction. A second guide hole is formed in the central portion along the axial direction, and there are a plurality of slit portions in which slits are cut halfway along the axial direction from the tip, A power supply chip having a base end mounted on the guide body, a slide body that is slidably fitted along the axial direction of the guide body and has conductivity, and is provided for the slide body. A third wire insertion hole is provided at the center along the axial direction, and is disposed so as to cover the peripheral surface of the front end portion of the power supply chip and away from the peripheral surface of the power supply chip, and a part of the power supply chip Abuts each slot so that power can be applied. A conductive tip holder that presses the slit portion inward, and a compression coil spring that is externally fitted to the guide body and biases the tip holder toward the proximal end side of the guide body via the slide body. The gist of the present invention is a forced pressurizing power supply chip assembly characterized in that it is included.

  According to a second aspect of the present invention, in the first aspect, the third wire insertion hole of the chip holder is attached with a welding prevention member having a fourth wire insertion hole through which the wire inserted through the power supply chip passes. It is characterized by.

According to a third aspect of the present invention, in the first or second aspect, the surface of the chip holder is plated.
According to a fourth aspect of the present invention, there is provided a forced pressurization power supply torch characterized in that the forced pressurization power supply tip assembly according to any one of the first to third aspects is detachably attached to the torch body. It is a summary.

  According to the forced pressurized power supply tip assembly of claim 1, since the tip holder is disposed so as to cover the tip portion peripheral surface of the power supply tip and away from the tip portion peripheral surface, The generated heat is not directly transmitted to the power supply chip, and the temperature rise of the chip can be suppressed.

  Further, according to the forced pressurizing power supply tip assembly of claim 1, the cylindrical power supply tip is urged to the proximal end side of the guide body by the compression coil spring through the slide body, and each slit portion Because the wire is displaced inwardly, the wire is forcedly pressed over the entire circumference and brought into contact with the wire, so that arcing inside the chip can be prevented and stable power feeding can be performed. Further, unlike the leaf spring, the compression coil spring does not become unstable with respect to heat, so that stable power feeding can be performed.

  Further, the wear of the power feed tip can be suppressed, and there is no need to improve the tip life. In addition, since the slit of the power feed tip is cut from the tip to the middle and the base end of the power feed tip is not divided, it can be positioned stably when attached to the torch body. Furthermore, according to the forced pressurization power supply chip | tip assembly of Claim 1, there exists an effect which can enjoy said effect easily only by attaching a guide body with respect to the torch body of the conventional welding torch. .

According to the second aspect of the present invention, the third wire insertion hole of the chip holder is provided with the welding prevention member having the fourth wire insertion hole, thereby preventing the feeding chip from being welded.
According to the invention of claim 3, since the surface of the chip holder is plated, it is possible to prevent spatter (electrode scattering film) from adhering to the surface of the chip holder.

  According to invention of Claim 4, the forced pressurization electric power feeding torch which can implement | achieve the effect of any one of Claim 1 thru | or 3 easily can be provided.

  Hereinafter, an embodiment of a forced pressure power supply tip assembly (hereinafter simply referred to as a power supply tip assembly) and a welding torch embodying the present invention will be described with reference to FIGS. FIG.1 (b) shows the electric power feeding chip assembly of this embodiment, and Fig.1 (a) is a longitudinal cross-sectional view of the state which attached the electric power feeding chip assembly to the welding torch.

  The welding torch 30 of the present embodiment is a consumable electrode gas shielded arc welding torch, and as shown in FIG. 1, the tip of the torch body 31 of the welding torch 30 (the lower end in FIGS. 1 (a) and 1 (b)). ) Is connected to a tubular tip body 32. The torch body 31 and the chip body 32 are made of a conductive material such as copper. A female screw 32a is formed at the tip of the chip body 32, and the power supply chip assembly 50 is detachably screwed. In the chip body 32, a coil liner 33 inserted into the torch body 31 extends to the vicinity of the female screw 32a.

  An insulating bush 34 is screwed onto the outer periphery of the center portion in the longitudinal direction of the chip body 32 and is covered with the insulating bush 34. In the chip body 32, the upper end that is not covered with the insulating bush 34 is covered by the extension of the insulating tube 35 that covers the torch body 31.

  A base 36 is fixed from the center of the outer periphery of the insulating bush 34 to the lower end. A nozzle 37 is detachably threadedly engaged with a male screw 36 a formed on the base 36. The nozzle 37 is provided so as to surround the power supply tip assembly 50 and the tip of the insulating bush 34.

  A locking step portion 38 is provided on the inner peripheral surface of the base end side in the nozzle 37, and an orifice 39 slidably fitted in the axial direction of the chip body 32 is locked by a flange 40 at the upper end. . The shield gas supplied from a gas cylinder (not shown) passes through the wire insertion hole 31a of the torch body 31, the wire insertion hole 32b of the tip body 32, the shield gas outlet 32c, and further passes through the shield gas outlet 39a of the orifice 39. The molten pool is ejected from the nozzle tip 41 to shield the molten pool from the air. A washer 42 is interposed between the nozzle 37 and the base 36.

Next, the power supply chip assembly 50 will be described.
The power supply chip assembly 50 includes a cylindrical guide body 51, and a male screw 51 a is formed on the outer peripheral surface of the base end (upper end in FIGS. 1A and 1B) of the chip body 32. The female screw 32a is detachably screwed.

  The guide body 51 is made of a conductive material such as copper, and a first wire insertion hole 52 is formed at a central portion along the axial direction of the guide body 51. The guide body 51 can be energized by being screwed into the chip body 32. An operation tool hanging surface 51b is provided on the outer peripheral surface from the center to the base end of the guide body 51. A fitting hole 53 having a diameter larger than that of the first wire insertion hole 52 is formed at the tip of the guide body 51 (the lower end in FIGS. 1A and 1B). The base end of 54 is detachably inserted.

  The power feed chip 54 is made of a conductive material such as copper, and a second wire insertion hole 55 is formed at the center along the axial direction. The power supply chip 54 may use a sintered material having high hardness such as copper tungsten, a copper alloy such as chrome copper or beryllium copper, or conductive ceramics. In the present embodiment, the power feed tip 54 is formed from copper tungsten. In addition, the power supply chip 54 is provided with a plurality of slits 57 (that is, a plurality of divided pieces) in which slits 56 are cut halfway along the axial direction from the tip. In the present embodiment, the slits 57 are formed by cutting the slits 56 in a cross shape as shown in FIG. 3A, but are not limited to four. A plurality of slits may be provided at equal intervals. A bulging portion 59 protrudes outward at a substantially central portion of the outer peripheral surface along the axial direction of the slit portion 57, and a tapered surface 59a having a smaller diameter toward the tip is formed on the lower surface (see FIG. 3 (b)). A substantially cylindrical slide body 58 is externally fitted to the guide body 51 so as to be slidable along the axial direction.

  The slide body 58 is made of a conductive material such as copper. A large diameter portion 58a, a small diameter portion 58b, and a medium diameter portion 58c are coaxial from the proximal end (the upper end in FIGS. 1A and 1B) to the distal end at the central portion along the axial direction of the slide body 58. It is formed as follows. Then, the inner peripheral surface of the small diameter portion 58 b is in contact with the outer peripheral surface of the guide body 51, whereby the guide body 51 and the slide body 58 can be energized. A female screw 58d is formed on the inner peripheral surface of the tip of the middle diameter portion 58c of the slide body 58, and the chip holder 60 is detachably screwed.

  The chip holder 60 is formed in a cylindrical shape from a conductive material such as stainless steel or chrome copper, and is screwed to the female screw 58d by a male screw 60a at the base end thereof. Note that the thermal conductivity of the chip holder 60 does not matter. This screwing enables energization between the chip holder 60 and the slide body 58. Further, a third wire insertion hole 61 is formed in the center portion of the chip holder 60 along the axial direction. As shown in FIG. 1B, the inner diameter of the third wire insertion hole 61 has a space S with respect to the outer peripheral surface of the portion located on the tip side from the bulging portion 59 in the slit portion 57 of the power feed tip 54. Is set to Further, a chamfered taper surface 61 a is formed on the opening peripheral edge of the base end (the upper end in FIG. 1B) side of the third wire insertion hole 61, and the taper surface 61 a is formed on the taper surface 59 a of the slit portion 57. It is in contact. When the taper surfaces come into contact with each other, it is possible to energize the chip holder 60 and the power feeding chip 54.

  Further, the tip holder 60 has a slit portion by extending the tip of the third wire insertion hole 61 further along the axial direction than the tip of the slot 57 as shown in FIG. The welding preventing member 65 is fixed to the inner surface of the distal end side of the extended third wire insertion hole 61 which is disposed so as to cover 57. The welding prevention member 65 is made of a heat-resistant material such as ceramic, and is formed so that the fourth wire insertion hole 66 is coaxial with the second wire insertion hole 55 of the power feed tip 54 in the central portion along the axial direction. Has been. The tip of the tip holder 60 is formed in a truncated cone, and the surface exposed from the slide body 58 excluding the portion screwed with the female screw 58d of the slide body 58 (for example, the tapered surface and the tip surface of the truncated cone). Is plated to prevent spatter adhesion.

  On the outer peripheral surface of the guide body 51, a compression coil spring 68 is wound between the center and the tip. One end of the compression coil spring 68 is locked to the tip of the guide body 51, and the other end is locked to a locking step 58e provided between the middle diameter portion 58c and the small diameter portion 58b of the slide body 58, whereby the slide body 58 is locked. Is always urged toward the base end side of the guide body 51 (upward in FIG. 1B). By the urging force of the compression coil spring 68, the taper surface 61a of the chip holder 60 presses the taper surface 59a of the slit portion 57 via the slide body 58, and the slit portion 57 is displaced inwardly (axially). Thus, the slit 56 is narrowed and the power feed tip 54 is held in the fitting hole 53.

  Further, when the slide body 58 is moved 180 degrees opposite to the base end side of the guide body 51 against the urging force of the compression coil spring 68, an operating tool hanging surface such as a spanner provided on the outer peripheral surface of the guide body 51 is used. 51 b is exposed, and in this state, the power tool tip assembly 50 can be attached to and detached from the chip body 32 by hanging the operating tool on the operating tool hanging surface 51 b.

  The amount of insertion of the power feed tip 54 into the fitting hole 53 is the maximum amount of movement when the slide body 58 is moved 180 degrees opposite to the base end side of the guide body 51 against the biasing force of the compression coil spring 68 ( That is, the length of the slide body 58 is longer than the amount of movement of the slide body 58 to the state where the compression coil spring 68 is compressed to the maximum. For this reason, the power feeding chip 54 does not fall out of the fitting hole 53 when the slide body 58 moves by the maximum movement amount.

(Operation of the embodiment)
The operation of the welding torch 30 configured as described above will be described.
As shown in FIG. 1A, in the state where the power feeding tip assembly 50 is attached to the welding torch 30, the wire W guided in the torch body 31 and the tip body 32 by the coil liner 33 is connected to the guide body 51. The first wire insertion hole 52 and the second wire insertion hole 55 of the power feed tip 54 are inserted. Further, the wire W is extended along the axial direction in a state where the entire circumference is in contact with the slit portion 57 located in the third wire insertion hole 61, and the fourth wire insertion hole 66 of the welding prevention member 65. It passes through the nozzle 37 and protrudes first. In this state, electric power supplied from a welding power supply device (not shown) is passed from the slitting unit 57 via the path of the torch body 31, the tip body 32, the guide body 51, the slide body 58, the chip holder 60, and the slitting unit 57. Supplied to the wire W.

  Here, since a space S is formed between the slit portion 57 of the power supply tip 54 and the chip holder 60, heat generated during welding is not directly transmitted to the power supply tip 54 due to this space S. Due to this space S, heat conduction is poor, so that the temperature rise of the power feed tip 54 itself can be suppressed. In addition, when the chip holder 60 is formed of a conductive material having poor thermal conductivity, the heat transfer is further reduced, and the effect of reducing chip wear can be exhibited and the life of the power feed chip 54 can be extended. .

  In addition, since the wire is forcedly pressed by the compression coil spring 68, the four slits 57 are in contact with each other over substantially the entire circumference of the wire W, so that the wire W can always be stably fed. And arcing inside the chip can be prevented. As a result, chip wear and the like are reduced, and the chip life can be improved.

  As shown in FIG. 1, when the power supply tip assembly 50 is removed while the power supply tip assembly 50 is attached to the welding torch 30, the nozzle 37 is screwed off from the insulating bush 34. Then, the slide body 58 is moved downward against the urging force of the compression coil spring 68 to expose the operation tool hooking surface 51b. The power tool tip assembly 50 is removed from the chip body 32 by screwing the power tool tip 50 on the exposed tool tool hooking surface 51b.

  Here, for example, when it is desired to replace the power supply chip 54 of the power supply chip assembly 50 that has been removed, the chip holder 60 is screwed out of the slide body 58 and removed. When the chip holder 60 is removed, there is no longer anything that holds the power supply chip 54, so the power supply chip 54 can be easily removed from the fitting hole 53 and replaced easily.

Further, when attaching the power feed tip assembly 50 to the welding torch 30, the operation opposite to that for detaching may be performed.
The power supply tip assembly 50 configured as described above and the welding torch 30 including the power supply tip assembly 50 have the following characteristics.

  (1) In the power supply chip assembly 50 of the present embodiment, the chip holder 60 is disposed so as to cover the front end portion peripheral surface of the power supply tip 54 and away from the front end portion peripheral surface. The heat generated sometimes is not directly transmitted to the power supply chip 54, and the temperature rise of the chip can be suppressed. Further, since the tip holder 60 shields the arc heat during welding and is not directly received by the power feed tip 54, the power feed tip 54 is prevented from being softened by heat, wear of the power feed tip 54 can be reduced, and the life is extended. be able to. Further, since the temperature does not become high, oxidation of the power supply chip 54 can be prevented.

  (2) Further, since the tip holder 60 is urged toward the proximal end side of the guide body 51 by the compression coil spring 68 through the slide body 58, each of the slits 57 is displaced inward, so that the slits 57 become the wires. Since forced pressurization is applied to W over almost the entire circumference, arcing inside the chip can be prevented and stable power feeding can be performed. Further, since the slot 57 of the power feed tip 54 always moves flexibly following the behavior of the wire W, it is electrically stable and uniform welding is possible.

Further, unlike the leaf spring, the compression coil spring 68 does not become unstable with respect to heat, and therefore stable power feeding can be performed.
(3) The power supply chip assembly 50 according to the present embodiment can suppress wear of the power supply chip 54 and can improve the life of the chip. In addition, the slit 56 of the power feed tip 54 is cut from the tip to the middle, and the base end of the power feed tip 54 is not divided, so that it can be stably positioned when attached to the torch body.

  (4) Furthermore, the power feed tip assembly 50 of the present embodiment has an effect that the above effect can be easily enjoyed only by attaching the guide body to the torch body of the conventional welding torch.

  (5) Further, in the power supply chip assembly 50 of the present embodiment, the third wire insertion hole 61 of the chip holder 60 is provided with the welding prevention member 65 including the fourth wire insertion hole 66, whereby the slit portion 57. Since the wire feeding direction side is covered with the welding prevention member 65, welding of the power feed tip 54 can be prevented.

  (6) Since the power supply chip assembly 50 of the present embodiment is plated on the surface of the chip holder 60, it is possible to prevent adhesion of spatter (electrode scattering film) to the surface of the chip holder 60. Can do.

  (7) In addition, since the power supply chip 54 of the present embodiment adopts a collet method having the slit portion 57, the wire W is always centered, and therefore, it is effective in preventing the wire W from being aimed at any time. In the conventional example shown in FIG. 6, the power supply tip 22 has a problem of causing any problems because there is a clearance between the tip hole diameter through which the wire passes and the wire diameter.

  (8) Since the wire shavings generated due to the reason described in the prior art can be discharged to the outside through the slit 56 between the slit portions 57 in the power supply tip assembly 50, it does not remain inside. There is an effect that the feeding failure of the wire W does not occur due to clogging inside.

  (9) The power supply chip 54 of the present embodiment is made of copper tungsten. Although it is difficult to process a sintered material such as copper tungsten, in this embodiment, since the base end portion of the power supply tip 54 is only fitted to the chip body 32, it is necessary to perform screw processing. In addition, the sintered material can be easily pressure-molded with a mold.

  (10) Further, the welding torch 30 of the present embodiment is excellent in the above (1) to (9) because the power supply tip assembly 50 having the above-described configuration is detachably attached to the torch body 31. You can enjoy the effect.

(Other embodiments)
Next, another embodiment will be described with reference to FIGS. In addition, about the structure same as the said embodiment or an equivalent structure, the same code | symbol is attached | subjected and the description is abbreviate | omitted and it demonstrates focusing on a different structure.

  In the present embodiment, the configurations of the slide body 58 and the tip holder 60 are different in the configuration of the embodiment. That is, the slide body 58 includes a slider 70 that is slidably contacted with the guide body 51 along the axial direction, and a substantially cylindrical slide body main body 71 that is detachably screwed to the outer periphery of the slider 70. ing. The slider 70 and the slide body main body 71 are made of a conductive material having poor thermal conductivity such as stainless steel. One end of the compression coil spring 68 is locked to the tip of the guide body 51, and the other end is contacted and locked to the inner end of the slider 70 as shown in FIGS. 4 (a) and 4 (b). Further, the entire distal end portion of the slide body main body 71 is integrally formed as a chip holder 60.

  In the present embodiment, since the configuration is as described above, in the slide body main body 71, the corresponding portion of the guide body 51 and the power supply tip 54 are extended from the inner peripheral surface of the base end to the portion where the tapered surface 61a is formed. The medium diameter portion 58c, the female screw 58d, and the male screw 60a are omitted.

  By being formed in this way, in this embodiment, when the power feeding chip 54 is replaced by releasing the screwing between the slider 70 and the slide body main body 71, the replacement is possible. In this embodiment as well, the tip holder 60 is plated on the tip side surface.

  Also in this embodiment, the power feed tip assembly 50 has the same effects as the above-described embodiments (1) to (9), and the welding torch 30 to which the power feed tip assembly 50 is attached is the same as that in the above embodiment. The effect (10) described in (1) is achieved.

In addition, this invention is not limited to the said embodiment, You may comprise as follows.
O The welding torch of the above embodiment may be changed to a water-cooled torch or a semi-automatic torch.

In the embodiment, the exposed surface of the chip holder 60 (for example, the tapered surface and the tip surface of the truncated cone) is plated, but the entire surface may be plated.
The chip holder 60 is preferably a thermal material such as stainless steel having poor thermal conductivity, and may be a conductive ceramic, for example.

Next, technical ideas other than those described in the scope of claims understood from the embodiment will be listed.
(1) The forced pressurization power supply chip assembly according to any one of claims 1 to 3, wherein the power supply chip is detachably fitted to the guide body. Since the power supply chip only needs to be detachably fitted to the guide body, it is not necessary to perform screw processing.

(A) is principal part sectional drawing of the welding torch of one Embodiment which actualized this invention, (b) is a longitudinal cross-sectional view of the electric power feeding chip assembly of one Embodiment which materialized this invention. Similarly, sectional drawing of each member which decomposed | disassembled the welding torch. (A) is a bottom view of the power supply chip, (b) is a front view of the power supply chip, and (c) is a plan view. (A) is principal part sectional drawing of the electric power feeding chip assembly of other embodiment, (b) is principal part sectional drawing of the electric power feeding chip assembly at the time of moving a slide body similarly. The figure of the system which shows the general structure of the robot for welding. Sectional drawing of the conventional welding torch.

Explanation of symbols

30 ... welding torch, 31 ... torch body, 31a ... wire insertion hole,
32 ... Chip body, 33 ... Coil liner, 34 ... Insulating bush,
39 ... Orifice, 50 ... Power feeding tip assembly, 51 ... Guide body,
52 ... 1st wire insertion hole, 53 ... Fitting hole, 54 ... Feeding chip,
55 ... 2nd wire insertion hole, 56 ... Slit, 57 ... Slot part,
58 ... slide body, 59 ... bulge, 59a ... taper surface,
60 ... Chip holder, 61 ... Third wire insertion hole,
65 ... welding prevention member, 66 ... fourth wire insertion hole, 68 ... compression coil spring,
70 ... Slider, 71 ... Slide body main body, 71a ... Storage hole S ... Space.

Claims (4)

A conductive guide body provided detachably with respect to the tip body of the welding torch, and having a first wire insertion hole in the center along the axial direction;
A second wire insertion hole is formed in the central portion along the axial direction, and has a plurality of slit portions in which slits are cut halfway along the axial direction from the distal end, and the proximal end is the guide body A power supply chip attached to the
A slide body that is slidably fitted along the axial direction of the guide body and has conductivity;
It is provided for the slide body, has a third wire insertion hole at the center along the axial direction, and is disposed so as to cover the tip portion peripheral surface of the power supply chip and away from the tip portion peripheral surface, A conductive tip holder, a part of which is in contact with each slot of the power feed chip so as to be energized and presses the slot inward;
A forced pressurizing power supply tip assembly, comprising: a compression coil spring that is externally fitted to the guide body and biases the tip holder toward the proximal end side of the guide body through the slide body.   The welding prevention member provided with the 4th wire penetration hole through which the wire penetrated via the said electric power feeding chip passes is attached to the 3rd wire penetration hole of the said chip | tip holder. Forced pressure feeding chip assembly.   The forced pressurizing power supply chip assembly according to claim 1 or 2, wherein the outer surface of the chip holder is plated.   A forced pressurizing power supply torch, wherein the forced pressurization power supply chip assembly according to any one of claims 1 to 3 is detachably attached to the torch body.

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