JP2557429Y2 - Consumable electrode torch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a consumable electrode type torch used for an arc welding apparatus or the like.

[0002]

2. Description of the Related Art In general, a consumable electrode type torch is mounted by screwing a contact tip (electron supply) to a tip portion of a torch body for supplying power to a consumable electrode such as a wire. The torch which performs arc welding or the like using a large current of 300 A or more usually has a structure in which a cooling water passage is formed for cooling the torch body or a nozzle for discharging a shielding gas.

A contact tip is a component for supplying power to a consumable electrode in the vicinity of a welding arc. The contact tip degrades due to an increase in temperature due to radiant heat of the arc and heat generated by contact resistance when supplying power to the consumable electrode. Is no longer usable and is replaced. By repeating such a situation, the thread portion for fixing the contact tip of the torch body gradually wears, and the contact resistance in the portion also increases, which promotes the deterioration of the thread portion and accelerates the wear of the torch itself. .

FIG. 6 shows an example of a consumable electrode type torch which solves the above-mentioned problems.
This consumable electrode type torch has a structure in which a tip adapter 3 is interposed between a torch main body 1 and a contact tip 2. The torch main body 1 has a cylindrical shape having an outer diameter A having a hole 5 into which a consumable electrode 4 such as a wire is inserted, a torch main body female screw portion 6 is formed at a central portion of a lower end thereof, and a cooling portion is formed inside. A water passage 7 is formed. Cooling water passage 7
Consists of a supply-side passage 8 and a discharge-side passage 9 extending in the axial direction, respectively, and an annular gap 10 located near the lower end and communicating with the supply-side passage 8 and the discharge-side passage 9. The torch main body 1 is cooled by passing water through the supply-side passage 8, the gap 10, and the discharge-side passage 9.

[0005] The contact tip 2 has a substantially conical contact tip main body portion 11 and a male thread portion (hereinafter referred to as a contact tip male thread portion) at the bottom center.
12 is formed so as to protrude, and a through hole 13 is formed through the contact tip male screw portion 12 and the contact tip main body portion 11 to insert the consumable electrode 4. Through hole
Reference numeral 13 denotes a substantially conical inlet-side through-hole 14 which opens to the contact tip male screw portion 12 side, and is provided so as to be connected to the inlet-side through-hole 14. The inner diameter is slightly larger than the outer diameter of the consumable electrode 4. And an electrode contact through hole 15 having a diameter. When the consumable electrode 4 is continuously supplied to the electrode contact through hole 15, the contact tip 2 comes into contact with the hole 15,
The arc current supplied from the torch main body 1 via the tip adapter 3 is supplied to the consumable electrode 4.

The tip adapter 3 has a structure in which an adapter male thread 16 and an adapter female thread 17 which are respectively screwed to the torch body female thread 6 and the contact tip male thread 12 are provided at the center of both ends.
Around the end of the torch main body 1 (hereinafter referred to as the torch main body abutting part).
At the end forming 19 and the adapter female thread 17,
Contact tip male thread 12 of contact tip 2
A contact tip side adapter contact portion 21 that contacts a contact tip contact portion 20 formed around the contact tip is formed.

In this consumable electrode type torch, the wear of the adapter female thread portion 17 received each time due to the renewal of the contact tip wear occurs in place of the female thread portion 6 of the torch main body 1. Since recovery can be achieved, the production cost can be reduced by reducing the frequency of replacing the expensive torch body 1.

[0008]

In the above-described consumable electrode type torch shown in FIG. 6, since the tip adapter 3 is interposed between the torch main body 1 and the contact tip 2, the cooling water passage 7 of the torch main body 1 is provided. The cooling effect of the contact tip 2 obtained by flowing the cooling water to the contact tip 2 is greatly reduced, the wear of the contact tip 2 is increased, the replacement frequency of the contact tip 2 is increased, and the contact tip 2 is frequently replaced. Therefore, there is a possibility that the production line is stopped and productivity is reduced. In the consumable electrode type torch, when the outer diameter of the torch main body, that is, the outer shape of the torch main body is increased, problems such as a decrease in workability occur. In order to prevent such a problem from occurring, it is desired to suppress an increase in the outer shape of the torch main body 1 within an allowable range of arc current conduction.

The present invention has been made in view of the above-mentioned problems, and it is possible to improve the productivity without increasing the outer diameter of the torch main body and suppressing frequent replacement of contact tips. It is an object of the present invention to provide a consumable electrode type torch that can be used.

[0010]

According to the present invention, in order to achieve the above object, a torch body and a tip adapter are screwed with a thread formed on the tip adapter on a thread formed on the torch body. Thus, in the consumable electrode type torch in which the outer peripheral end surface of the thread portion of the tip adapter and the outer peripheral end surface of the thread portion of the torch main body are joined together and a contact tip is connected to the tip adapter, A cooling water passage extending in the axial direction passing through each of the butting portions, and an annular tapered recess for receiving an O-ring is provided at a portion of the butting portion outside the cooling water passage. A ring-shaped tape for receiving an O-ring is screwed into a threaded portion between the threaded portion of the torch body and the threaded portion of the tip adapter. Characterized in that a par with the recess.

[0011]

According to this structure, the contact tip is directly cooled by the tip adapter, so that the temperature can be effectively prevented from rising, and the abrasion of the contact hole of the contact tip and the screw portion can be suppressed. Can be In addition, since an annular tapered recess for storing the O-ring is provided, compared with a case where a normal recess for storing the O-ring is provided in the cooling water passage at the butt portion, in order to prevent liquid leakage, the shaft and the shaft are required. It is not necessary to increase the length in the orthogonal direction, and thus the outer diameter of the torch body.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A consumable electrode type torch according to an embodiment of the present invention will be described below with reference to FIGS. The same members and portions as those shown in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted.

In the torch body 1, supply-side and discharge-side passages 30 and 31 in the torch body corresponding to the supply-side passage 8 and the discharge-side passage 9 in FIG. The opening 18 is formed. Tip adapter 3
The cooling water circulation gap 34 in the tip adapter having an annular opening in the torch body side adapter abutting portion 19 and extending in the axial direction is provided with the supply side passage and the discharge side passage 30 in the torch body through the opening. It is provided to be able to communicate with 31.
That is, by providing the cooling water circulation gap 34 in the tip adapter, the cooling water passage 35 is always formed when the female thread portion 6 of the torch main body and the male screw portion 16 of the tip adapter are screwed together.

A tapered surface (concave portion) 1b having an inclination angle of 50 ° with respect to a direction perpendicular to the axis is formed on the inner wall 1a on the lower end side of the torch main body 1. The base of the adapter male thread portion 16 has a small diameter, and the small diameter portion 36 and the tapered surface 1b
And the torch main body-side adapter contact portion 19 to form an inner space portion 37.

The outer part of the annular opening of the cooling water circulation gap 34 in the tip adapter of the tip adapter 3 includes:
A taper surface 38 having an inclination angle of 80 ° with respect to the axial direction is formed diagonally downward, and is connected to the bottom of this taper surface 38 and extends in the axial direction to the torch main body side adapter contact portion 19 to be tapered. A wall portion 39 that forms a recess together with the surface 38 is formed, and the tapered surface 38, the wall portion 39, and the torch main body contact portion 18 are formed.
, An outer space 40 is formed.

Each of the inner gap portion 37 and the outer gap portion 40 has an inner O-ring 41 and an outer O-ring 42, each having a circular cross section as shown by a dashed line in FIG.
Is arranged. When the tip adapter 3 is screwed into the torch main body 1, the torch main body contact portion 18 and the torch main body-side adapter contact portion 19 come into contact with each other, so that the torch main body 1
The tip adapter 3 is joined to the torch main body contact portion 18 and the torch main body side adapter contact portion.
The inner O-ring 41 and the outer O-ring 42 are deformed when they come into contact with 19, but the deformation is absorbed by forming the tapered surface 1b and the tapered surface 38.

In the consumable electrode type torch thus configured, since the tip adapter 3 is provided, the electrode contact through-hole 15 and the contact tip male screw portion 12 of the contact tip 2 are deteriorated, and the influence of the renewal is reduced by the tip. Since the adapter 3 receives it, the torch main body 1 is not worn.

Further, a cooling water circulation gap 34 in the tip adapter is formed by communicating the tip adapter 3 with the supply side passage and the discharge side passages 30 and 31 in the torch body, respectively, and the supply side passage and the discharge side passage 30 in the torch body are formed. , 31, cooling water passage 35 from cooling water circulation gap 34 in tip adapter
By passing the cooling water through the cooling water passage 35, the cooling water is deprived of the heat generated when an arc is generated, and the torch main body 1 and the tip adapter 3 are cooled. Tip 2 is cooled.

In the consumable electrode type torch shown in FIG. 6, a cooling water passage 7 is provided in the torch main body 1, and the cooling of the contact tip 2 is performed via the tip adapter 3. Tip 2 due to temperature rise due to radiant heat and Joule heat
The electrode contact through-hole 15 and the male screw portion 12 are likely to wear out, and as a result, the replacement of the contact tip 2 and the tip adapter 3 and the like is forced, and there is a problem that the productivity is reduced due to the interruption of the work due to the replacement. In this embodiment, the contact tip 2 is cooled directly by the tip adapter 3 by flowing the cooling water through the cooling water passage 35 provided in the torch main body 1 and the tip adapter 3 as described above. A rise in temperature can be prevented, the wear of the electrode contact through-hole 15 and the male screw portion 12 of the contact tip 2 can be suppressed, and the replacement frequency of the contact tip 2 and the tip adapter 3 can be reduced to maintain good productivity. .

In order to prevent water leakage in the cooling water passage, as shown in FIGS. 4 and 5, the torch main body side adapter contact with the torch main body supply side passage and discharge side passage 30 is connected. Ring-shaped grooves 50 and 51 whose width G is longer than the depth are formed in the portion 19, and the inner O-ring 41 and the outer O-ring 42 are accommodated in the grooves 50 and 51, respectively. It is conceivable to construct a consumable electrode type torch by absorbing the deformation of each of the inner O-ring 41 and the outer O-ring 42 in a gap formed in a direction perpendicular to the axis. However, the length of the cooling water passage in the direction perpendicular to the axis of the abutting portion of the torch body and the tip adapter is set to be long in the width dimension G in consideration of the deformation of the O-ring in order to obtain a sufficient liquid leakage prevention effect. There is a possibility that the outer diameter of the torch main body 1 becomes large, causing a problem that the workability is reduced. On the other hand, in the consumable electrode type torch of the present embodiment, a tapered surface 1b is formed on the lower inner wall 1a of the torch main body 1, and an inner space 37 formed by the tapered surface 1b and the small diameter portion 36 and the like is used. Since the O-ring 41 is accommodated, it is not necessary to increase the length in the direction perpendicular to the axis, and thus the outer diameter of the torch main body 1, in order to prevent liquid leakage, resulting in a reduction in workability. Nothing.

In this embodiment, since the tapered surface 38 is provided for accommodating the outer O-ring 42, the outer space 40 having a large space can be secured without increasing the length in the direction perpendicular to the axis. Therefore, it is not necessary to increase the outer diameter of the torch body 1 in order to absorb the deformation of the outer O-ring 42,
The workability can be prevented from lowering.

According to the present invention, the torch body 1 withstands a water pressure of 3 kg / cm ² , can supply a welding current of 600 A, and
The outer diameter of the consumable electrode type torch as shown in FIG. 1 and FIG. 2 is configured by setting the outer diameter of the consumable electrode type torch as shown in FIG. 1 and FIG. As a result of comparative verification, FIG.
And the replacement frequency of the contact tip 2 of the consumable electrode torch obtained based on FIG. 2 is １ ／ compared to the replacement frequency of the contact tip 2 of the consumable electrode torch shown in FIG. The continuous arc generation time of about 8 minutes, which was impossible with the consumable electrode type torch shown in FIG. 6, was able to withstand. Thus, it was verified that the productivity can be improved by implementing the present invention.

In the above embodiment, the taper surface 1b is formed on the lower end side inner wall 1a of the torch main body 1. However, instead of this, the torch is formed on the lower end side inner wall 1a of the torch main body 1 as shown in FIG. An annular recess 1c is formed so that the inner diameter of the screw hole 6a of the female screw portion 6 of the main body is increased, and an inner space 60 for accommodating the inner O-ring 41 is formed from the recess 1c and the small diameter portion 36. With this configuration, the thickness T between the cooling water passage 35 and the cooling water passage 35 is small, and the rigidity of this portion is lost and deformation occurs. When the thickness T is increased, the outer diameter of the torch main body 1 is increased.

In the above embodiment, the tip adapter 3 is provided with the adapter male thread 16 and the torch body 1 is formed with the torch body female thread 6 which is screwed to the adapter male thread 16. 1 may be provided with an external thread, and the tip adapter 3 may be formed with an internal thread that is screwed to the external thread of the torch body 1. In such a configuration, the taper surface (concave portion) provided on the torch main body 1 in the above embodiment is formed on the tip adapter 3.

In the above embodiment, the case where the consumable electrode type torch is used for arc welding is taken as an example. However, the present invention is not limited to this, and can be applied to, for example, plasma spraying or other similar methods. it can.

[0026]

The present invention is a consumable electrode type torch constructed as described above, so that the contact tip is directly cooled by the contact tip connected to the tip adapter, so that the temperature rises effectively. Can be prevented and wear of the electrode contact hole and the screw portion of the contact tip can be suppressed, so that the frequency of replacement of the contact tip and the tip adapter and the like can be reduced, and good productivity can be maintained.

An annular tapered recess for accommodating an O-ring is provided in each of a threaded portion of the screw portion of the torch body and the thread portion of the tip adapter and a portion outside the cooling passage. As compared with the case where the ordinary recesses for accommodating the O-rings inside and outside the cooling water passage are provided, the length in the direction perpendicular to the axis and, hence, the outer diameter of the torch main body do not need to be increased. It does not lead to a decrease in sex.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a tip of a consumable electrode torch according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a partially enlarged cross-sectional view of a consumable electrode torch having a torch main body in which a lower end side inner wall is formed so that an inner diameter of a screw hole is increased.

FIG. 4 is a sectional view showing that a groove is provided in the tip adapter.

FIG. 5 is a partially enlarged view of FIG. 4;

FIG. 6 is a cross-sectional view showing an example (tip) of a conventional consumable electrode torch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Torch main body 1a Lower end side inner wall 1b Tapered surface 2 Contact tip 3 Tip adapter 4 Consumable electrode 6 Torch main body female screw part 16 Adapter male screw part 18 Torch main body contact part 19 Torch main body side adapter contact part 35 Cooling water passage 38 Tapered surface 39 Wall 41 Inner O-ring 42 Outer O-ring

Claims (1)

(57) [Scope of request for utility model registration] 1. A torch body and a tip adapter are screwed together with a thread formed on the tip adapter to a thread formed on the torch main body, whereby an outer peripheral side end face of a thread of the tip adapter and the torch are connected. In a consumable electrode type torch in which a threaded portion of the main body is abutted against an outer peripheral end face and a contact tip is connected to the tip adapter, the torch main body and the tip adapter are passed through respective butted portions in an axial direction. A cooling water passage extending to the outside of the cooling water passage in the abutting portion, an annular tapered recess for receiving an O-ring is provided, and a threaded portion of the torch body and a threaded portion of the tip adapter are formed. A consumable electrode type torch characterized in that an annular tapered recess for accommodating an O-ring is provided in the threaded portion. .