JP7293980B2 - Welding torch suction unit - Google Patents

Description

TECHNICAL FIELD The present invention relates to a welding torch suction unit, and more particularly to a welding torch suction unit for sucking welding fumes generated from a nozzle of the welding torch.

Conventionally, a technique has been proposed in which harmful gases (welding fumes) generated from the tip of a torch in arc welding are forcibly sucked from a suction port provided on the outer periphery of the torch and led to an exhaust device (for example, Patent Document 1). In Patent Document 1, a torch body (1) having a nozzle (4) at the tip thereof is provided with a base ring (13) and a tip ring (18) surrounding it with a gap therebetween (see Patent Document 1). Figure 2). Welding fumes generated from the tip of the torch are discharged through the outlet (14) through the inside of the base ring (13) and the tip ring (18).

Further, in Patent Document 1, a notch is provided at the end of the tip ring (18), and a tightening band (22) is tightened from thereon to tighten the base ring (13) and the tip ring (18). are connected.

Japanese Utility Model Laid-Open No. 48-798821

By the way, since welding fume accumulates on the base ring (13) and the tip ring (18) as a result of suction, it is necessary to perform maintenance such as cleaning at predetermined intervals (every 20 to 30 minutes). .

However, in Patent Document 1, the tightening band (22) must be removed or attached each time maintenance is performed, and the work efficiency is not necessarily good. The same is true when connecting using other fixing members such as screws. As a solution to this problem, it is conceivable to simply insert the distal end member into the proximal end member without using a fixing member. occur.

Therefore, the present invention provides a welding torch that can reliably fix the base end side cylindrical member and the tip end side cylindrical member without using a separate fixing member, and can also accurately perform centering in the radial direction. The object is to provide a suction unit.

To achieve the above objects, the present invention provides a welding torch suction unit in which a welding torch body and a nozzle connected to the tip of the welding torch body are loosely inserted to form a welding fume suction flow path. and a first cylindrical member and a second cylindrical member connected to the distal end side of the first cylindrical member, and at least two projecting members are formed on the outer peripheral surface of the first cylindrical member on the distal end side. A part of the second cylindrical member on the proximal end side has a larger diameter than the other part, and the outer peripheral surface of the part of the first cylindrical member on the distal end side can be displaced without contacting the outer peripheral surface of the part. At least two fitting slits are formed in a part of the second cylindrical member on the proximal end side, and the at least two fitting slits are formed so that the at least two projecting members can be fitted. The at least two protruding members arranged on the inner and innermost sides have a substantially T-shaped cross section including a head portion and a trunk portion, and the at least two fitting slits are formed on the outer peripheral surface of the second cylindrical member. A raised portion is formed on the inner and inner outer edges of the sealing member, and in a state in which the distal end side of the first cylindrical member is connected to the proximal end side of the second cylindrical member, the distal end of the first cylindrical member is in contact with the sealing member. the body portions of the at least two projecting members are arranged in the inner depths of the at least two fitting slits via the at least two fitting slits, and the heads of the at least two projecting members provides a suction unit for a welding torch, which is characterized in that it rides on each of the raised portions on the side of the outer peripheral surface of the second cylindrical member.

Here, the at least two fitting slits are a first extending portion extending from the proximal end toward the distal end in the cylindrical axial direction of the second cylindrical member, and a circumferential direction bending from the extending destination of the first extending portion. and a second extension portion extending to the second extension portion, and the raised portion is preferably formed on the outer edge of the second extension portion.

According to the present invention, since the distal end side portion of the first cylindrical member and the proximal end side portion of the second cylindrical member are connected without contact, the first cylindrical member and the second cylindrical member are free from scratches or deformation. is less likely to occur. Further, the head of the projecting member rides on the raised portion and is pressed in the axial direction of the cylinder, so that the second cylindrical member is firmly fixed to the first cylindrical member. Therefore, it is possible to accurately perform centering in the radial direction while connecting the first cylindrical member on the base end side and the second cylindrical member on the distal end side without using a separate fixing member.

1 is a side view of a suction unit according to an embodiment of the invention; FIG. The figure for demonstrating the inside of a suction unit. The figure which shows the cylindrical member (1st cylindrical member) of a base end side. IV arrow directional view of FIG. The figure which shows the cylindrical member (2nd cylindrical member) by the side of a front-end|tip. VI Arrow directional view of FIG. The figure which shows the O-ring (sealing member) provided in the cylindrical member of the front end side. The figure which shows a state before the cylindrical member by the side of a front end is connected with the cylindrical member by the side of a proximal end. The figure which shows a mode that the trunk|drum of a projection member fits in the slit for fitting. The figure which shows the state which the head of the projection member rode on the swelling part. FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. 10; The figure which shows the cylindrical member (2nd cylindrical member) of the front end side which concerns on a modification.

<1. embodiment>
A suction unit for a welding torch according to an embodiment of the present invention will be described with reference to FIGS. 1 to 11. FIG. A suction unit 10 shown in FIG. 1 is exemplified below as an example of a suction unit of a welding torch according to the present invention.

The suction unit 10 is a member into which the torch body 4 (FIG. 2) described later and the nozzle 5 (FIG. 2) described later are loosely inserted to form a welding fume suction flow path FP (FIG. 2). Welding fumes are a kind of dust, and metal vaporized in the welding arc combines with oxygen during the cooling process to form fine metal oxides.

As shown in FIG. 1, the suction unit 10 includes a proximal side cylindrical member 1 connected to the distal end of the grip portion 3 and a distal side cylindrical member 2 connected to the cylindrical member 1. .

Next, the inside of the suction unit 10 will be briefly described with reference to FIG. Inside the suction unit 10, a torch body 4, a nozzle 5 attached to the tip of the torch body 4, a tip 6 attached to the tip of the nozzle 5, and a welding wire 7 provided on the tip 6 are inserted.

A welding wire 7 is sent out through the torch body 4 and the tip 6 to the tip of the welding torch. Welding current is supplied to the welding wire 7 via the tip 6 via a conductive portion (not shown) of the torch body 4 .

A shielding gas (inert gas) is supplied through the torch body 4 to the nozzle 5 and emitted from the nozzle 5 . Welding fumes generated during the discharge of the shielding gas are sucked from an inlet 2H (see FIGS. 5 and 6) formed at the tip of the cylindrical member 2 .

As indicated by the dashed arrow in FIG. 2, the sucked welding fume is sucked through the suction flow path FP from the distal side toward the proximal side, and is exhausted to the outside through an exhaust port (not shown).

As shown in FIGS. 3 and 4, the cylindrical member 1 is a hollow member having an R shape gently curved from the proximal end to the distal end. Two protruding members 11 having the same configuration are provided at positions facing each other on the outer circumference of the cylindrical member 1 on the distal end side (the surface of the cylindrical member on the distal end side). In addition, two fixing members 13 having the same configuration are provided at opposing positions on the outer periphery of the cylindrical member 1 on the proximal side (the cylindrical surface on the proximal side).

The fixing member 13 is a member for attaching and fixing the base end side of the cylindrical member 1 to the above-described gripping portion 3 (see FIG. 1).

The projecting member 11 is a member for fixing the distal end side of the cylindrical member 1 and the proximal end side of the cylindrical member 2 in a connected state. As shown in FIG. 4, the protruding member 11 has a substantially T-shaped cross section including a head portion 11H and a body portion 11B.

When connecting the proximal end side of the cylindrical member 2 to the distal end side of the cylindrical member 1, the trunk portion 11B passes through a fitting slit 25 (see FIG. 5) formed in the cylindrical member 2, which will be described later, and is inserted into the fitting slit 25. It is placed in the innermost (most innermost) of the Further, the head portion 11H rides on a later-described raised portion 250 (see FIGS. 5 and 6) on the side of the outer peripheral surface of the cylindrical member 2. As shown in FIG.

As shown in FIGS. 5 and 6, the cylindrical member 2 is a hollow member that is connected to the distal end side of the cylindrical member 1 and forms the aforementioned suction flow path FP together with the cylindrical member 1 .

As shown in FIG. 5, the cylindrical member 2 is composed of four regions: a proximal region 21, an inclined region 22, a central region 23, and a distal region 24. As shown in FIG.

The base end region 21 is a region arranged at a position surrounding a portion of the outer peripheral surface of the cylindrical member 1 on the distal end side when the proximal end side of the cylindrical member 2 is connected to the distal end side of the cylindrical member 1 . Note that the base end region 21 is a region corresponding to "a portion of the second cylindrical member on the base end side" according to the present invention.

The base end region 21 has a diameter larger than that of the other portion, and has a diameter capable of surrounding the outer peripheral surface of a portion of the cylindrical member 1 on the distal side without contacting the outer peripheral surface. In other words, the inner peripheral surface of the base end region 21 surrounds the outer peripheral surface of a portion of the cylindrical member 1 on the distal end side with a space therebetween without contact.

Two fitting slits 25 are formed in the base end region 21 at opposing positions on the outer peripheral surface of the cylindrical member 2 . 5, one of the two fitting slits 25 is shown.

The fitting slit 25 is formed in a substantially L shape, and includes an extension portion 251 extending from the base end toward the tip end in the cylindrical axial direction of the cylindrical member 2, and an extension portion of the extension portion 251 that is bent and extends in the circumferential direction. and an extension portion 252 . When the distal end side of the cylindrical member 1 and the proximal end side of the cylindrical member 2 are connected, the body portion 11B of the projecting member 11 described above is fitted into the fitting slit 25 .

In addition, a raised portion 250 (see FIG. 6) raised from the outer peripheral surface of the cylindrical member 2 is formed on the inner and inner outer edges of the fitting slit 25 (where the extending portion 252 extends). When the distal end side of the cylindrical member 1 and the proximal end side of the cylindrical member 2 are connected, the trunk portion 11B (FIG. 4) of the projecting member 11 is arranged deep inside the fitting slit 25, and the head of the projecting member 11 is arranged. The portion 11H ( FIG. 4 ) rides on the raised portion 250 .

The inclined region 22 is a region extending from the tip of the proximal region 21 toward the proximal end of the central region 23 while being inclined obliquely inward. An O-ring OR shown in FIG. 7 is attached to the inner peripheral surface of the inclined region 22 (innermost side of the base end region 21). When the distal end side of the cylindrical member 1 and the proximal end side of the cylindrical member 2 are connected, the distal end of the cylindrical member 1 contacts the O-ring OR, and the connecting portion of the connected cylindrical member 1 and the cylindrical member 2 is sealed. . The O-ring OR is an example of the sealing member according to the present invention.

The central region 23 is a region extending from the inclined region 22 toward the distal side, and has a diameter smaller than that of the base end region 21 described above.

The tip region 24 is a portion continuous with the tip of the central region 23 described above, and gradually narrows inward toward the tip. A plurality of intake ports 2H arranged in the circumferential direction are formed in the tip region 24 . A plurality of inlets 2H are formed for sucking in welding fumes generated during discharge of the shielding gas.

Next, a procedure for connecting the proximal end side of the cylindrical member 2 to the distal end side of the cylindrical member 1 will be described with reference to FIGS. 8 to 11. FIG.

First, from the state before connection shown in FIG. It is fitted into the fitting slit 25 and pushed in along the extended portion 251 of the fitting slit 25 .

Then, as shown in FIG. 9, the trunk portion 11B of the protruding member 11 is arranged in the L-shaped bent portion of the fitting slit 25. As shown in FIG.

Thereafter, from the state of FIG. 9, the cylindrical member 2 is rotated in the direction of the dashed arrow with respect to the circumferential direction, and the trunk portion 11B of the protruding member 11 is moved along the extending portion 252 of the fitting slit 25, The trunk portion 11B is moved to the inner depth of the fitting slit 25 (extended portion 252).

Then, as shown in FIG. 10, the trunk portion 11B of the protruding member 11 is arranged deep inside the fitting slit 25. As shown in FIG. At that time, as shown in FIG. 11, the head portion 11H of the protruding member 11 rides on the raised portion 250. Then, as shown in FIG. When the head 11H rides on the raised portion 250, the head 11H is pressed in the axial direction of the cylinder, so that the cylindrical member 2 is pressed against the cylindrical member 1 and fixed.

As shown in FIG. 11, the tip of the cylindrical member 1 abuts on the O-ring OR, and the connection between the cylindrical member 1 and the cylindrical member 2 is sealed.

8 to 11 show that one of the two protruding members 11 is fitted into one of the two fitting slits 25, the protruding member 11 on the opposite side and the fitting slit 25 is the same.

In accordance with the procedure as described above, the two protruding members 11 are fitted into the inner depths of the two fitting slits 25 respectively, and the proximal end side of the cylindrical member 2 is connected to the distal end side of the cylindrical member 1 .

According to the above-described embodiment, the base end region 21 (a portion of the base end side) of the cylindrical member 2 and a portion of the tip end side of the cylindrical member 1 are connected without contact with a space therebetween. Therefore, the cylindrical member 1 and the cylindrical member 2 are less likely to be damaged or deformed, and it is possible to accurately perform centering in the radial direction.

Further, according to the above-described embodiment, when the base end side of the cylindrical member 2 is connected to the distal end side of the cylindrical member 1, the head portion 11H of the projecting member 11 is attached to the raised portion 250 on the side of the outer peripheral surface of the cylindrical member 2. climb up. As a result, the head portion 11H of the protruding member 11 is pressed in the axial direction of the cylinder, and the base end side position of the cylindrical member 2 is firmly fixed to the tip end side part of the cylindrical member 1 . Therefore, it is possible to securely fix the base end side of the cylindrical member 2 to the distal end side of the cylindrical member 1 without using a separate fixing member such as a tightening band or a screw.

Further, according to the above-described embodiment, the fitting slit 25 has an L-shape, and the trunk portion 11B of the protruding member 11 is arranged deep inside the fitting slit 25 . Therefore, even if a force is applied in a direction in which the cylindrical member 1 and the cylindrical member 2 separate from each other in the direction of the cylindrical axis, the cylindrical member 1 and the cylindrical member 2 are unlikely to be released from the connected state.

Further, according to the above-described embodiment, the tip of the cylindrical member 1 abuts on the above-described O-ring OR, and the connecting portion between the cylindrical member 1 and the cylindrical member 2 is sealed. It is possible to suppress leakage to

<2. Variation>
The suction unit for a welding torch according to the present invention is not limited to the above-described embodiments, and various modifications and improvements are possible within the scope of the claims.

For example, in the above-described embodiment, as shown in FIG. 5, the case where the fitting slit 25 is configured in an L shape was illustrated, but the present invention is not limited to this. As shown in FIG. 12 , the fitting slit 26 may be formed in a straight line shape, and ridges 260 may be formed on the inner, inner, and outer edges of the fitting slit 26 . Even if the fitting slit 26 is linear, the head 11H of the protruding member 11 rides on the raised portion 260, so that the cylindrical member 1 and the cylindrical member 2 are maintained in a fixed state (connected state). However, assuming a situation in which a force is applied in a direction in which the cylindrical member 1 and the cylindrical member 2 are separated from each other, the above-described embodiment in which the fitting slit 25 is configured in an L shape is more effective in terms of maintaining the connection state between the two. preferable.

Further, according to the above-described embodiment, the two protruding members 11 are provided on the distal end side of the cylindrical member 1 at positions facing each other, and the two fitting slits 25 are formed on the proximal end side of the cylindrical member 2 at positions facing each other. Although the case where it is made has been exemplified, it is not limited to this. Three projecting members 11 may be provided on the distal end side of the cylindrical member 1 and three fitting slits 25 may be provided on the proximal end side of the cylindrical member 2 . In that case, the three protruding members 11 may be arranged at positions dividing the outer circumference of the cylindrical member 1 into three equal parts. Accordingly, the three fitting slits 25 may also be arranged at positions dividing the outer circumference of the cylindrical member 2 into three equal parts.

As described above, the welding torch suction unit according to the present invention is suitable for a welding torch or the like that generates welding fumes.

1 cylindrical member, 2 cylindrical member, 2H intake port, 3 grip portion, 4 torch body,
5 nozzle, 6 tip, 7 welding wire, 10 suction unit, 11 projecting member,
11B trunk, 11H head, 13 fixing member, 21 proximal region, 22 inclined region,
23 central region, 24 tip region, 25 fitting slit, 26 fitting slit,
250 raised portion, 251 extended portion, 252 extended portion, 260 raised portion,
FP Suction channel, OR O-ring

Claims (2)

A welding torch suction unit in which a welding torch body and a nozzle connected to the tip of the welding torch body are loosely inserted to form a welding fume suction flow path,
a first cylindrical member;
a second cylindrical member connected to the distal end side of the first cylindrical member;
with
At least two protruding members are provided on the outer peripheral surface of the first cylindrical member on the distal end side,
A part of the second cylindrical member on the proximal end side has a larger diameter than other parts, and can surround the outer peripheral surface of the part on the distal end side of the first cylindrical member without contacting the outer peripheral surface. having a diameter
At least two fitting slits capable of fitting the at least two protruding members are formed in a part of the second cylindrical member on the proximal end side, and a sealing member is arranged on the innermost side,
the at least two protruding members each having a substantially T-shaped cross section including a head portion and a trunk portion;
On the outer peripheral surface of the second cylindrical member, raised portions are formed on the inner and inner outer edges of the at least two fitting slits,
In a state where the distal end side of the first cylindrical member is connected to the proximal end side of the second cylindrical member,
the tip of the first cylindrical member is arranged at a position in contact with the sealing member;
The body portions of the at least two protruding members are arranged in the inner depths of the at least two fitting slits via the at least two fitting slits,
A suction unit for a welding torch, wherein the heads of the at least two projecting members ride on the raised portion on the side of the outer peripheral surface of the second cylindrical member. The at least two fitting slits include a first extending portion extending from the proximal end toward the distal end in the cylindrical axial direction of the second cylindrical member, and a second extending portion bending from the extension destination of the first extending portion and extending in the circumferential direction. 2 extensions;
2. A suction unit for a welding torch according to claim 1, wherein said raised portion is formed on an outer edge of said second extending portion.

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