JP2010023063A - Welding torch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a welding torch in which a tip body having a contact tip can be simply set to a prescribed angular position while being surely positioned in a direction around the axis with respect to the torch body, and in which saving of resources and improvement of operability can be achieved by extending service life of the contact tip. <P>SOLUTION: The rotary position of the tip body with respect to the torch body is configured to be set to a plurality of prescribed angular positions by providing a plurality of alternatively usable positioning means to both fitting parts of the torch body and the tip body, respectively. Also, on the outer circumferential side of both fitting parts of the torch body and the tip body, an insulator capable of maintaining or releasing the fitted state of both engaging parts is rotatably mounted. The insulator is formed in a cylindrical shape and provided, at the inner face of one opening end, with a threaded part that is screwed to the outer circumferential screw of the torch body and also provided, at the outer face of the other opening end, with a threaded part that is screwed to the inner screw of a nozzle to be mounted on the outer circumferential face side of the tip body. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a welding torch used for carbon dioxide welding or the like, and more particularly to a welding torch in which a tip body having a contact tip at the tip is detachably attached to a torch body.

  Generally, a welding torch includes a torch body to which a gripping part to be gripped by a welding operator by hand and a tip body that is detachably attached to the tip of the torch body. A contact tip is replaceably attached to the tip, and a nozzle, an orifice, etc. for injecting carbon dioxide gas are attached.

In the case of such a welding torch, the welding work is performed by supplying power while the welding wire is continuously inserted (supplied) into the circular wire insertion hole of the contact tip. As a result, the wire insertion hole is worn and spreads in a specific direction, and power feeding becomes unstable. Conventionally, in order to prevent such inconvenience, the contact tip itself that is worn by detachably attaching the contact tip is replaced or the tip unit having the contact tip or the like as disclosed in Patent Document 1 is used. Is known that is mounted so as to be rotatable around the axis.
Japanese Patent No. 4012552

  However, in the welding torch for replacing the contact tip itself, it is difficult to save resources because the life of the contact tip itself is shortened and needs to be replaced frequently. On the other hand, it is necessary to remove and attach using a tool such as a wrench, and the replacement work itself tends to be troublesome.

  Further, in the welding torch disclosed in Patent Document 1, a tip unit having a tip body and a nozzle or the like to which a contact tip is attached is detachably attached to the torch body and is attached to be rotatable around an axis. Therefore, by rotating the tip unit, the position of the wire with respect to the wire insertion hole of the contact tip can be changed, and the portion where the wire insertion hole is not worn can be used, and the life of the contact tip can be extended. However, since the tip unit is simply rotatable with respect to the torch body, it is difficult to position the contact tip so that the wire is securely positioned in the unworn portion of the wire insertion hole, for example, welding In the case of a manual welding operation in which the operator grips and holds the grip portion of the torch body, the positioning operation (rotation operation) is easy to perform, and the entire tip unit needs to be replaced. It is not preferable also from a surface.

  The present invention has been made in view of such circumstances, the purpose of which can be easily set to a predetermined angular position while reliably positioning the tip body having the contact tip in the direction around the axis with respect to the torch body, It is an object of the present invention to provide a welding torch capable of extending the life of a contact tip to save resources and improve operability.

  In order to achieve this object, the invention according to claim 1 of the present invention has a torch body having a fitting portion at the tip, and a fitting portion that can be fitted to the fitting portion of the torch body. A welding torch comprising a tip body that is detachably attached to the torch body and is rotatably attached in a direction around the axis and having a contact tip attached to a tip thereof, wherein the fitting portion of the torch body and the tip body A plurality of positioning means are respectively provided in the fitting portion, and the plurality of positioning means are selectively used so that the rotational position of the tip body relative to the torch body can be set at a plurality of predetermined angular positions, and the torch An insulator capable of maintaining or releasing the fitting state of both fitting parts is rotatably mounted on the outer peripheral side of both fitting parts of the body and the chip body.

  According to a second aspect of the present invention, the insulator is formed in a cylindrical shape, and has a threaded portion that can be screwed to an outer peripheral screw of the torch body on the inner surface of one opening end, and the outer surface of the other opening end. And a screw portion that can be screwed into an inner surface screw of a nozzle mounted on the outer peripheral surface side of the chip body. Furthermore, the invention according to claim 3 is characterized in that the positioning means is formed by a plurality of convex portions and concave portions that can be set at a rotational position of 180 degrees, 120 degrees, or 90 degrees. .

  According to the invention described in claim 1 of the present invention, by using a plurality of positioning means respectively provided at both fitting portions of the torch body and the tip body, the tip body with respect to the torch body can be used. Since the rotation position can be set at a plurality of predetermined angular positions, and the fitting state of both fitting parts of the torch body and the chip body can be maintained and released by the rotating operation of the insulator, the positioning means has a contact chip. The tip body can be easily set to the specified angular position while securely positioning the tip body in the direction around the axis, conserving resources by extending the life of the contact tip, and setting the specified angular position by rotating the insulator The operability can be improved.

  Further, according to the invention described in claim 2, in addition to the effect of the invention described in claim 1, it can be screwed into both opening ends of the cylindrical insulator with the outer peripheral screw of the torch body or the inner screw of the nozzle. Since each screw portion is provided, the screw portion can be screwed into the torch body or the nozzle screw by rotating the insulator, and the angle setting operation between the tip body and the torch body can be performed more easily.

  Further, according to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, a plurality of positioning means can be set at a rotational position of 180 degrees, 120 degrees, or 90 degrees. Since it is formed by the convex part and the concave part, the angular position of the contact tip can be set to an optimum number, and the life of the contact tip can be effectively extended.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 10 show an embodiment of a welding torch according to the present invention, in which FIG. 1 is an exploded perspective view thereof, FIG. 2 is a half sectional view of the joined state, and FIGS. 3 and 4 are half views of the torch body. FIG. 5 and FIG. 6 are half sectional views and side views of the chip body, FIG. 7 is a half sectional view of the insulator, FIG. 8 and FIG. 9 are explanatory diagrams of the use state, and FIG. It is a side view which shows an example.

  As shown in FIGS. 1 and 2, the welding torch 1 includes a torch body 2 to which a grip portion (not shown) is coupled on the base end side, a tip body 3 fitted to the tip of the torch body 2, An insulator 4 mounted on the outer peripheral side of the fitting portions 7 and 8 of the chip body 3 and the torch body 2, an orifice 5 and a nozzle 6 mounted on the outer peripheral side of the chip body 3 are provided.

  As shown in FIGS. 3 and 4, the torch body 2 is formed in a pipe shape and has a wire insertion hole through which a wire is supplied and a hole 2 a serving as a gas passage through which carbon dioxide gas flows. Further, a tapered fitting hole 7a having a large diameter at the distal end side (left side in FIG. 3) and a small diameter at the proximal end side (right side in FIG. 3) is provided at the distal end of the torch body 2. The fitting part 7 which consists of the external thread 7b as an outer periphery screw formed in the outer peripheral surface is formed. Further, on the end surface of the fitting portion 7 of the torch body 2, a pair of square-shaped convex portions as viewed from the side as viewed from the axial direction projecting a predetermined dimension forward at a diametrically opposed position (θ = 180 ° position). 9 is integrally formed. A grip fitting portion 2b (see FIG. 1) to which a grip portion (not shown) is fitted and connected is formed on the base end side of the torch body 2.

  As shown in FIGS. 5 and 6, the tip body 3 is formed in a pipe shape and has a hole 3 a that serves both as a wire insertion hole and a gas passage like the torch body 2, and has a contact tip 11 at the tip thereof. For example, a screw portion 11c (see FIG. 8) is detachably screwed. Further, a fitting portion 8 is provided at the proximal end of the chip body 3, and the fitting portion 8 has a small diameter on the proximal end side (right side in FIG. 5) and a large diameter on the distal end side (left side in FIG. 5). It is formed by a tapered cylindrical portion 8a and a ridge portion 8b formed in a ring shape on the distal end side of this cylindrical portion 8a, and a diametrically opposed position (180 degree position) from the cylindrical portion 8a to the ridge portion 8b. ) Is formed with a pair of recesses 10.

  And the positioning means of this invention is comprised by this recessed part 10 and the said convex part 9, The cylindrical part 8a of the fitting part 8 is fitted by the fitting hole 7a of the fitting part 7 of the torch body 2, and a fitting part When the convex part 9 of the fitting part 7 is fitted into the concave part 10 of 8, the torch body 2 and the chip body 3 are brought into a fitted state, and are positioned in the direction around the axis to restrict their rotation. Yes. Note that the tip of the tip body 3 and the contact tip 11 which is attached to the tip and has a wire insertion hole 11a (see FIG. 2) have a notch 12 (see FIG. 1) indicating the attachment position, if necessary. Is formed.

  As shown in FIG. 7, the insulator 4 is formed in a cylindrical shape (pipe shape) having a hole 4a therein, and an internal thread 4b is formed on the inner surface of the base end which is one open end, and the other A male screw 4c is formed on the outer surface of the tip which is an open end. Further, in order to facilitate the rotation operation by the welding worker, a concave portion 4d and a slip stopper 4e are formed on the outer peripheral surface of the insulator 4 as necessary.

  The insulator 4 is tightened by rotating the female screw 4b to the male screw 7b of the fitting portion 7 of the torch body 2 and rotating it to the right. The male screw 4c is used as an inner surface screw of the nozzle 6. Are screwed into the female screw 6b (see FIG. 2), rotated to the right, and tightened, whereby the fitting portions 7 and 8 of the torch body 2 and the chip body 3 are brought into a fitted state. Further, by rotating the insulator 4 leftward to release the screwed state with the torch body 2 and the nozzle 6, the insulator 4 is removed from both the fitting portions 7, 8, and the torch body 2 and the chip body 3 are removed. Is to be disassembled.

  As shown in FIGS. 1 and 2, the nozzle 6 is formed in a pipe shape and has a hole 6a therein, and the female screw 6b is formed on the inner surface of the base end side of the hole 6a. In addition, a non-slip 6c for rotation operation is formed at a predetermined position on the outer peripheral surface of the nozzle 6. Further, as shown in FIG. 1, the orifice 5 mounted in the nozzle 6 has a hole 5a inside, and a plurality of rectifying holes 5b are formed along the circumferential direction on the outer peripheral surface. The configuration of the nozzle 6 and the orifice 5 is substantially the same as that of a conventional welding torch.

  Next, an example of how to use the welding torch 1 configured as described above will be described with reference to FIGS. First, when assembling each member from the disassembled (divided) state shown in FIG. 1, the orifice 5 is inserted into the nozzle 6 as shown by the arrow A in FIG. 1, and the female screw 6b of the nozzle 6 is then inserted as shown by the arrow B. Screw into the male screw 4 b of the insulator 4, and the orifice 5 and the nozzle 6 are integrated with the insulator 4. Further, the fitting portion 8 of the chip body 3 is fitted to the fitting portion 7 of the torch body 2 as indicated by an arrow C in FIG. At this time, the cylindrical portion 8 a of the fitting portion 8 is fitted into the fitting hole 7 a of the fitting portion 7 using the taper shape, and the pair of concave portions 10 of the fitting portion 8 is formed on the fitting portion 7. It will be in the state fitted to a pair of convex parts 9, respectively.

  In this state, the insulator 4 in which the nozzle 6 and the like are integrated is inserted into the body 3 from the tip end side (contact tip 11 side) of the tip body 3 as indicated by an arrow D, and the female screw 4b of the insulator 4 is inserted into the torch body 2. Are screwed into the male screw 7b of the fitting portion 7. As a result, the tip body 3 (contact tip 11), the insulator 4, the orifice 5 and the nozzle 6 are attached (coupled) to the torch body 2 and set to the use state.

  In this state of use, the wire 13 inserted into the hole 2a of the torch body 2 or the wire insertion hole 11a of the chip body 3 protrudes from the tip surface of the contact chip 11 as shown in FIG. By turning on an operation switch (not shown) provided in the section, carbon dioxide gas is supplied through the hole 2a and the like, and is supplied into the nozzle 6 from the rectifying hole 5b of the orifice 5, and the tip of the nozzle 6 The wire 13 is ejected from the wire insertion hole 11a by a predetermined amount while being supplied with power to the wire 13, and a welding operation is performed.

  When this welding operation is performed for a predetermined time, the wire insertion hole 11a of the contact tip 11 which was initially circular as shown in FIG. 9 (a) due to power supply to the wire 13 or the like is shown in FIG. 9 (b). Furthermore, the wire 13 is worn in the bending direction, and the wire insertion hole 11a becomes substantially elliptical by the worn portion 11b. As described above, the wear of the wire insertion hole 11a affects the power supply state to the wire 13 and, for example, causes a power supply failure and makes it difficult to perform stable welding work. Therefore, when the wire insertion hole 11a is worn to a predetermined amount, The attachment angle of the contact tip 11 is changed as follows.

  That is, the angle is changed by first rotating the insulator 4 in the anti-tightening direction and removing the insulator 4 from the torch body 2 with the nozzle 6 and the like integrated. At this time, the tip body 3 maintains a state in which the fitting portion 8 is fitted to the fitting portion 7 of the torch body 2, and the tip body 3 is pulled out from the torch body 2 and both the fitting portions 7. , 8 is released and the tip body 3 is removed from the torch body 2. Then, the detached chip body 3 is rotated 180 degrees as indicated by an arrow E in FIG. 9B, and the fitting portion 8 of the chip body 3 is fitted again to the fitting portion 7 of the torch body 2.

  By this re-fitting, the tip body 3 is rotated 180 degrees with respect to the torch body 2, and the wire insertion hole 11a of the contact tip 11 has a wear portion 11b as shown in FIG. ), And is in the same state as shown in FIG. 9A in which the bending direction portion of the wire 13 of the wire insertion hole 11 is not worn. Then, after the tip body is rotated 180 degrees, the insulator 4 in which the nozzle 6 and the like are integrated is inserted from the tip of the tip body 3 and screwed into the torch body 2 so that the members are joined. The welding state is set again to the use state and the power supply state to the wire 13 is stable.

  When the tip body 3 is rotated 180 degrees and used again, and the wire insertion hole 11a of the contact tip 11 is worn at both positions in the diametrical direction, it is assumed that the contact tip 11 has reached the end of its life. 11 is used by being attached to the chip body 3. This contact tip 11 can be replaced by removing the insulator 4 with the nozzle 6 and the like integrated from the torch body 2.

  That is, in the welding torch 1, when the tip body 3 is attached to the torch body 2 in a predetermined direction and welding is performed for a predetermined time, the wire insertion hole 11 a of the contact tip 11 is worn in the bending direction of the wire 13. Removes the insulator 4 in which the nozzle 6 and the like are integrated from the torch body 2. Thereafter, the tip body 3 is detached from the torch body 2 and rotated 180 degrees around the axis, and the tip body 3 is fitted to the torch body 2 again, and the insulator 4 and the like are attached to the torch body 2 to thereby make contact tips. Thus, a state in which the 11 wire insertion holes 11a are not worn in the bending direction can be obtained, and the welding operation is performed in this state.

  In the above description, the rotation operation of the wire insertion hole 11a of the contact tip 11 is performed by the rotation operation of the insulator 4 with the nozzle 6 and the orifice 5 being integrated with the insulator 4. However, for example, the nozzle 6 and the orifice 5 As a matter of course, it is possible to adopt a method in which the members are attached to and detached from each other separately from the insulator 4.

  Thus, in the welding torch 1 of the above embodiment, the pair of convex portions 9 and the concave portions 10 provided in the fitting portions 7 and 8 of the torch body 2 and the tip body 3 are alternatively selected. As a result, the rotational position of the tip body 3 relative to the torch body 2 is set at two predetermined angular positions, and the fitting state of the fitting portions 7 and 8 of the torch body 2 and the tip body 3 is maintained. Can be released by rotating the insulator 4 or the like, so that the tip body 3 having the contact tip 11 with the convex portion 9 and the concave portion 10 is positioned with respect to the torch body 2 in the direction around the axis with a predetermined angular position. Can be set easily.

  As a result, the contact relationship between the wire 13 and the wire insertion hole 11a of the contact tip 11 can be maintained satisfactorily and stable welding work can be performed, the life of the contact tip 11 can be extended, resources can be saved, and the insulator 4 can be rotated. The contact tip 11 can be easily set at a predetermined angular position by operation, and the operability can be improved.

  Further, since the cylindrical insulator 4 has the female screw 4b and the male screw 4c that can be screwed into the male screw 7b of the torch body 2 and the female screw 6b of the nozzle 6 at both opening ends, the rotating operation of the insulator 4 can be performed. The screws 4b and 4c can be screwed into the screws 7b and 6b of the torch body 2 and the nozzle 6, respectively. In particular, if the rotation operation is performed with the orifice 5 and the nozzle 6 integrated with the insulator 4, the rotation operation of the tip body 3 with respect to the torch body 2 can be performed more easily, and the contact tip 11 is replaced. In some cases, the operation can be easily performed.

  Further, since a pair of convex portions 9 and concave portions 10 as positioning means are provided and can be set at a rotational position of 180 degrees in the diametrical direction, the angular position of the contact tip 11 can be set to the minimum number, and its lifetime The efficiency of the welding operation can be improved, for example, it can be efficiently extended. Moreover, since the fitting parts 7 and 8 of the torch body 2 and the chip body 3 are brought into a fitting state using a taper shape, the fitting itself of both the bodies 2 and 3 can be stabilized, and both fittings can be performed. Since the outer peripheral side of the joint portions 7 and 8 is covered with the insulator 4, a stable state can be obtained at the joint portion between both bodies.

  In the above embodiment, the example in which the convex portion 9 and the concave portion 10 as the positioning means are provided at the 180-degree positions, which are opposite positions in the diameter direction, has been described, but the present invention is not limited thereto. For example, as shown in FIG. 10 (a), three convex portions 9 and concave portions 10 may be provided at equal intervals in the circumferential direction, that is, at θ = 120 degrees, respectively, or in FIG. 10 (b). As shown, four pieces may be provided at equal intervals in the circumferential direction, that is, at θ = 90 degrees. Thus, by increasing the number of the convex portions 9 and the concave portions 10 to a predetermined number, it is possible to further extend the life of the contact chip 11.

  Moreover, in the said embodiment, although the convex part 9 was provided in the torch body 2, and the recessed part 10 was provided in the chip body 3, for example, the recessed part 10 was provided in the end surface of the torch body 2, and the convex part 9 was provided in the chip body 3, etc. It is good also as a reverse structure, and the shape of the convex part 9 and the recessed part 10 is not restricted to square shape by side view, A suitable shape can be employ | adopted. Furthermore, the shape of the fitting part 7 of the torch body 2 and the fitting part 8 of the chip body 3, the shape of the insulator 4 and the like in the above embodiment are examples, and the scope does not depart from the gist of each invention according to the present invention. Can be changed as appropriate.

  INDUSTRIAL APPLICABILITY The present invention can be used for all welding torches in which the tip body can be changed in angular position in a plurality of stages with respect to the torch body.

The exploded perspective view of the welding torch concerning the present invention Half sectional view of the assembled state Half sectional view of the torch body The side view Half sectional view of the tip body The side view Half sectional view of the insulator Illustration of how to use the welding torch Other explanatory diagrams Side view showing a modification of the positioning means

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Torch for welding, 2 ... Torch body, 3 ... Tip body, 4 ... Insulator, 4a ... Hole, 4b ... Female screw, 4c ... Male screw, 5. .. Orifice, 6... Nozzle, 6b... Female screw (inner surface screw), 7... Fitting portion, 7a. ..Fitting part, 8a ... cylindrical part, 8b ... projection part, 9 ... convex part (positioning means), 10 ... recessed part (positioning means), 11 ... contact tip, 11a: Wire insertion hole, 11b: Wear part, 11c: Screw part, 13 ... Wire.

Claims (3)

A torch body having a fitting portion at the tip, a chip body having a fitting portion that can be fitted to the fitting portion of the torch body, and being detachably attached to the torch body and rotatably mounted in the direction around the axis; A welding torch comprising:
A plurality of positioning means are provided in the fitting portion of the torch body and the fitting portion of the chip body, respectively, and the rotation position of the chip body relative to the torch body is set at a plurality of predetermined angles by selectively using the plurality of positioning means. In addition to being configured to be able to be set at a position, an insulator that can maintain or release the fitting state of both fitting parts is rotatably mounted on the outer peripheral side of both fitting parts of the torch body and the chip body. Torch for welding.   The insulator is formed in a cylindrical shape, and has a screw portion that can be screwed to the outer peripheral screw of the torch body on the inner surface of one opening end, and is mounted on the outer peripheral surface side of the tip body on the outer surface of the other opening end. The welding torch according to claim 1, further comprising a screw portion that can be screwed into an inner screw of the nozzle.   The welding torch according to claim 1 or 2, wherein the positioning means is formed by a plurality of convex portions and concave portions that can be set at a rotational position of 180 degrees, 120 degrees, or 90 degrees. .

Images