JP2021030259A - Suction unit of welding torch - Google Patents

Abstract

To provide a suction unit of a welding torch that enables centering in a radial direction to be made accurately while surely fixing a cylinder member at a base end side to a cylinder member at a tip side without using an another fixing member.SOLUTION: A suction unit of a welding torch comprises a cylinder member 1 at a base end side and a cylinder member 2 at a tip side. A protrusion member 11 is provided on an outer peripheral surface at the tip side of the cylinder member 2. A base end region 21 in the cylinder member 2 has a radius in which the region can surround an outer peripheral surface of a portion at the tip side of the cylinder member 1 without contacting the outer peripheral surface. In the base end region 21, a slit for fitting to which the protrusion member 11 can be fitted is formed and an O-ring OR is arranged at a depth side. With the tip side of the cylinder member 1 contacted with the base end side of the cylinder member 2, the tip of the cylinder member 1 contacts the O-ring OR, a trunk part 11B is arranged at an inner depth part in the slit for fitting, and a head part 11H runs upon a raised part 250, at the outer peripheral surface side of the cylinder member 2.SELECTED DRAWING: Figure 11

Description

The present invention relates to a suction unit of a welding torch, and more particularly to a suction unit of a welding torch that sucks a welding fume generated from a nozzle of the welding torch.

Conventionally, a technique has been proposed in which harmful gas (welding fume) generated from the tip of a torch in arc welding is forcibly sucked from a suction port provided on the outer periphery of the torch and guided to an exhaust device (for example, Patent Document 1). In Patent Document 1, a torch body (1) having a nozzle (4) at its tip is provided with a base ring (13) and a tip ring (18) surrounding the torch body (1) through a gap (Patent Document 1). FIG. 2). The weld fume generated from the tip of the torch passes through the inside of the base ring (13) and the tip ring (18) and is discharged from the discharge port (14).

Further, in Patent Document 1, a notch is provided at the end of the tip ring (18), and the base ring (13) and the tip ring (18) are tightened by a tightening band (22) from above. Are concatenated.

Jitsukaisho 48-798821

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

However, in Patent Document 1, the tightening band (22) must be removed or attached every time maintenance is performed, and the work efficiency is not always good. The same applies to the case of connecting using other fixing members such as screws. On the other hand, a method of simply inserting the tip member into the base end member without using a fixing member can be considered, but there is a problem that radial centering cannot be performed accurately due to scratches or deformations due to contact. Occurs.

Therefore, the present invention provides a welding torch capable of accurately centering in the radial direction while reliably fixing the cylindrical member on the proximal end side and the cylindrical member on the distal end side without using a separate fixing member. It is an object of the present invention to provide a suction unit.

In order to achieve the above object, the present invention is 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 inside to form a suction flow path for a welding fume. A first cylindrical member and a second cylindrical member connected to the tip end side of the first cylindrical member are provided, and at least two projecting members are provided on the outer peripheral surface of the first cylindrical member on the tip end side. A part of the second cylindrical member on the base end side has a larger diameter than the other part, and the outer peripheral surface of the first cylindrical member does not come into contact with the outer peripheral surface of a part on the distal end side. At least two fitting slits having a diameter that can be surrounded and capable of fitting at least the two protruding members are formed in a part of the second cylindrical member on the base end side, and the sealing member is formed. The at least two protruding members are arranged on the inner inner side and have a substantially T-shaped cross section including a head portion and a body portion. Of the outer peripheral surfaces of the second cylindrical member, at least two fitting slits are formed. A ridge is formed on the inner and inner edges of the first cylindrical member, and the tip of the first cylindrical member comes into contact with the sealing member in a state where the tip end side of the first cylindrical member is connected to the proximal end side of the second cylindrical member. The body portions of the at least two projecting members are arranged at 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 are arranged. The unit provides a suction unit for a welding torch, which is characterized in that it rides on the raised portion on the side of the outer peripheral surface of the second cylindrical member.

Here, the at least two fitting slits are bent from the first stretched portion extending from the base end to the tip end in the cylindrical axial direction of the second cylindrical member and the stretched destination of the first stretched portion in the circumferential direction. It is preferable that the ridge portion is formed on the outer edge of the second stretched portion, including the second stretched portion extending to.

According to the present invention, since the tip end side part of the first cylindrical member and the base end side part of the second cylindrical member are connected without contacting each other, the first cylindrical member and the second cylindrical member are scratched or deformed. Is unlikely to occur. Further, since the head of the protruding member rides on the raised portion and the head is pressed in the direction of the cylindrical axis, the second cylindrical member is firmly fixed to the first cylindrical member. Therefore, it is possible to accurately center in the radial direction while connecting the first cylindrical member on the proximal end side and the second cylindrical member on the distal end side without using a separate fixing member.

The side view which shows the suction unit by embodiment of this invention. The figure for demonstrating the inside of a suction unit. The figure which shows the cylindrical member (first cylindrical member) on the base end side. The IV arrow view of FIG. The figure which shows the cylindrical member (second cylindrical member) on the tip side. FIG. 5 is a view taken along the line VI of FIG. The figure which shows the O-ring (sealing member) provided in the cylindrical member on the tip side. The figure which shows the state before the cylindrical member on the tip end side is connected to the cylindrical member on the base end side. The figure which shows the state which the body part of the protrusion member fits into the fitting slit. The figure which shows the state which the head of the protrusion member rides on the ridge part. FIG. 5 is a cross-sectional view taken at the XI-XI position of FIG. The figure which shows the cylindrical member (second cylindrical member) on the tip side which concerns on a modification.

<1. Embodiment>
The suction unit of the welding torch according to the embodiment of the present invention will be described with reference to FIGS. 1 to 11. Hereinafter, the suction unit 10 shown in FIG. 1 will be illustrated as an example of the suction unit of the welding torch according to the present invention.

The suction unit 10 is a member in which a torch body 4 (FIG. 2) and a nozzle 5 (FIG. 2), which will be described later, are loosely inserted into the inside to form a suction flow path FP (FIG. 2) for a welded fume. Welding fume is a type of dust, in which the metal vaporized during 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 base end side cylindrical member 1 connected to the tip end of the grip portion 3 and a tip end 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 mounted on the tip of the nozzle 5, and a welding wire 7 provided on the tip 6 are inserted.

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

The shield gas (inert gas) is supplied to the nozzle 5 via the inside of the torch body 4 and discharged from the nozzle 5. The weld fume generated during the release of the shield gas is sucked from the intake port 2H (see FIGS. 5 and 6) formed at the tip of the cylindrical member 2.

As shown by the broken line arrow in FIG. 2, the sucked welding fume is sucked from the tip end side to the base end side through the suction flow path FP, 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 that is gently bent from the base end to the tip end. Two protruding members 11 having the same configuration are provided at positions facing each other on the outer periphery of the cylindrical member 1 on the distal end side (the cylindrical surface on the distal end side). Further, on the outer periphery of the cylindrical member 1 on the proximal end side (the cylindrical surface on the proximal end side), two fixing members 13 having the same configuration are provided at positions facing each other.

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

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

When connecting the base end side of the cylindrical member 2 to the tip end side of the cylindrical member 1, the body portion 11B passes through the fitting slit 25 (see FIG. 5) formed in the cylindrical member 2 to be described later, and the fitting slit 25 It is placed in the innermost part (the innermost part) of. Further, the head portion 11H rides on the raised portion 250 (see FIGS. 5 and 6) described later on the outer peripheral surface side of the cylindrical member 2.

As shown in FIGS. 5 and 6, the cylindrical member 2 is a hollow member connected to the tip end side of the cylindrical member 1 and for forming the suction flow path FP described above together with the cylindrical member 1.

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

The base end region 21 is a region arranged at a position surrounding the outer peripheral surface of a part of the tip end side of the cylindrical member 1 when the base end side of the cylindrical member 2 is connected to the tip end side of the cylindrical member 1. The base end region 21 is a region corresponding to "a part 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 the cylindrical member 1 without contacting the outer peripheral surface of a part on the distal end side. That is, the inner peripheral surface of the proximal region 21 is surrounded by a space without contacting the outer peripheral surface of a part of the cylindrical member 1 on the distal end side.

In the base end region 21, two fitting slits 25 are formed at positions facing each other on the outer peripheral surface of the cylindrical member 2. In FIG. 5, one of the two fitting slits 25 is shown.

The fitting slit 25 is formed in a substantially L-shape, and has a stretched portion 251 extending from the base end to the tip end in the cylindrical axial direction of the cylindrical member 2 and a stretched portion 251 bent from the stretched end of the stretched portion 251 and extending in the circumferential direction. It has a stretched portion 252. When the tip end side of the cylindrical member 1 and the base end side of the cylindrical member 2 are connected, the body portion 11B of the protrusion member 11 described above is fitted into the fitting slit 25.

Further, a raised portion 250 (see FIG. 6) raised from the outer peripheral surface of the cylindrical member 2 is formed on the inner inner outer edge (stretched destination of the stretched portion 252) of the fitting slit 25. When the tip end side of the cylindrical member 1 and the base end side of the cylindrical member 2 are connected, the body portion 11B (FIG. 4) of the protrusion member 11 is arranged inside the fitting slit 25, and the head of the protrusion member 11 is formed. The portion 11H (FIG. 4) rides on the prime portion 250.

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

The central region 23 is a region extending from the inclined region 22 toward the tip end side, and has a smaller diameter than 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. The plurality of intake ports 2H are formed to suck in the welding fume generated during the discharge of the shield gas.

Subsequently, a procedure for connecting the base end side of the cylindrical member 2 to the tip end side of the cylindrical member 1 will be described with reference to FIGS. 8 to 11.

First, from the state before connection shown in FIG. 8, the body portion 11B of the protrusion member 11 is fitted while inserting the tip end side portion of the cylindrical member 1 into the proximal end side portion (base end region 21) of the cylindrical member 2. It is fitted into the fitting slit 25 and pushed along the extending portion 251 of the fitting slit 25.

Then, as shown in FIG. 9, the body portion 11B of the protrusion member 11 is arranged at the L-shaped bent portion of the fitting slit 25.

After that, from the state of FIG. 9, this time, the cylindrical member 2 is rotated in the direction of the broken line arrow with respect to the circumferential direction, and the body portion 11B of the protrusion member 11 is moved along the extension portion 252 of the fitting slit 25. The body portion 11B is moved to the inner back of the fitting slit 25 (stretched portion 252).

Then, as shown in FIG. 10, the body portion 11B of the protrusion member 11 is arranged inside the fitting slit 25. At that time, as shown in FIG. 11, the head portion 11H of the protrusion member 11 rides on the ridge portion 250. When the head portion 11H rides on the raised portion 250, the head portion 11H is pressed in the cylindrical axial direction, 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 described above, and the connection portion between the cylindrical member 1 and the cylindrical member 2 is sealed.

8 to 11 show how one of the two protrusions 11 fits into one of the two fitting slits 25, but the opposite side of the protrusions 11 and the fitting slits 25. The same applies to 25.

According to the above procedure, the two protrusion members 11 are fitted into the inner depths of the two fitting slits 25, and the base end side of the cylindrical member 2 is connected to the tip end side of the cylindrical member 1.

According to the above-described embodiment, the base end region 21 (base end side part) of the cylindrical member 2 and the tip end side part of the cylindrical member 1 are connected without contact with each other in a state of separating a space. Therefore, the cylindrical member 1 and the cylindrical member 2 are less likely to be scratched or deformed, and the centering in the radial direction can be performed accurately.

Further, according to the above-described embodiment, when the base end side of the cylindrical member 2 is connected to the tip end side of the cylindrical member 1, the head portion 11H of the protrusion member 11 is formed on the raised portion 250 on the outer peripheral surface side of the cylindrical member 2. Get on. As a result, the head portion 11H of the protrusion member 11 is pressed in the direction of the cylindrical axis, and the position of the base end side of the cylindrical member 2 is firmly fixed to a part of the tip end side of the cylindrical member 1. Therefore, it is possible to securely fix the base end side of the cylindrical member 2 to the tip end side of the cylindrical member 1 without separately using a 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 body portion 11B of the protrusion member 11 is arranged inside the fitting slit 25. Therefore, even if a force is applied in the direction in which the cylindrical member 1 and the cylindrical member 2 are separated from each other in the cylindrical axial direction, it is difficult to release the connected state of the cylindrical member 1 and the cylindrical member 2.

Further, according to the above-described embodiment, the tip of the cylindrical member 1 abuts on the above-mentioned O-ring OR, and the connection portion between the cylindrical member 1 and the cylindrical member 2 is sealed, so that a part of the sucked welding fume is external. It is possible to suppress leakage to.

<2. Modification example>
The suction unit of the welding torch according to the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the range described in the claims.

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

Further, according to the above-described embodiment, the two protruding members 11 are provided at positions facing each other on the tip end side of the cylindrical member 1, and the two fitting slits 25 are formed at positions facing each other on the base end side of the cylindrical member 2. However, the case is not limited to this. Three protrusions 11 may be provided on the tip end side of the cylindrical member 1, and three fitting slits 25 may be provided on the base end side of the cylindrical member 2. In that case, the three protrusion members 11 may be arranged at positions where the outer circumference of the cylindrical member 1 is divided into three equal parts. Correspondingly, the three fitting slits 25 may also be arranged at positions where the outer circumference of the cylindrical member 2 is divided into three equal parts.

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

1 Cylindrical member, 2 Cylindrical member, 2H intake port, 3 Grip part, 4 Torch body,
5 nozzles, 6 tips, 7 welding wires, 10 suction units, 11 protrusions,
11B body, 11H head, 13 fixing member, 21 base end area, 22 tilted area,
23 Central area, 24 Tip area, 25 Slit for fitting, 26 Slit for fitting,
250 heaps, 251 stretches, 252 stretches, 260 heaps,
FP suction flow path, 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 suction flow path for a welding fume.
The first cylindrical member and
A second cylindrical member connected to the tip 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.
The base end side part of the second cylindrical member has a larger diameter than the other parts, and the outer peripheral surface can be surrounded without contacting the outer peripheral surface of the tip end side part of the first cylindrical member. Has a diameter
At least two fitting slits into which the at least two protruding members can be fitted are formed in a part of the second cylindrical member on the base end side, and a sealing member is arranged on the inner inner side.
The at least two protruding members have a substantially T-shaped cross section including a head and a body.
Of the outer peripheral surface of the second cylindrical member, a ridge portion is formed on the inner inner and outer edges of the at least two fitting slits.
In a state where the tip end side of the first cylindrical member is connected to the base end side of the second cylindrical member,
The tip of the first cylindrical member is arranged at a position where it comes into contact with the sealing member.
The body portions of the at least two protrusion members are respectively arranged inside 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 protruding members ride on the ridges on the outer peripheral surface side of the second cylindrical member. The at least two fitting slits have a first extending portion extending from the base end toward the tip in the cylindrical axial direction of the second cylindrical member, and a first extending portion that bends from the extending destination of the first extending portion and extends in the circumferential direction. Including 2 stretched parts
The suction unit for a welding torch according to claim 1, wherein the ridge portion is formed on the outer edge of the second stretched portion.

Images