JPS6229190Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement of a water-cooled welding torch.

The structure of a conventional water-cooled welding torch is such that a contact tip is attached to the outside of a wire supply pipe located in the center, and a net tip fitting is installed to form a shield gas passage and a cooling water introduction/output passage. A nozzle insulator is arranged on the outside of the base of this neck end fitting, and a cooling water passage connected to the cooling water introduction/output passage of the neck end fitting and the nozzle insulator is provided outside of this nozzle insulator. Attach the water-cooled nozzle formed inside, and place one piece each on the overlapping surface of the nozzle insulator's neck end fitting and the water-cooled nozzle, which are located on the tip side of the connection between the neck end fitting and the cooling water passage of the water-cooled nozzle. A sealing member such as an O-ring for preventing water leakage is provided.

However, with this structure, cooling water permeates into the gaps between the fitting part of the nozzle insulator and the water-cooled nozzle, and the fitting part of the neck tip fitting and the nozzle insulator, resulting in cooling of the shield gas. As a measure against water contamination, one seal member is installed on the overlapping surface of the nozzle insulator neck tip fitting and the water-cooled nozzle, but the heat generated by the nozzle insulator made of resin and the water-cooled nozzle made of metal The gap between the two expands due to the difference in expansion rate, and the cooling water under pressure penetrates into the gap, so the sealing effect of the seal member is small.Furthermore, this leaking water cannot be drained to the outside, so the leaked cooling water is removed. Water gets caught up in the shielding gas flow and enters the molten pool during welding, causing welding defects.

The present invention solves the above-mentioned drawbacks by sufficiently sealing the gaps between the nozzle insulator and the connecting end fitting, and the overlapping surfaces of the nozzle insulator and water-cooled nozzle, and by preventing cooling water from penetrating into these gaps. By draining water out of the water-cooled nozzle, it is possible to prevent the cooling water from getting mixed into the shielding gas, and also to prevent welding defects caused by moisture mixed in the shielding gas entering the molten pool during welding. The purpose is to provide a water-cooled torch for welding.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Figure 1 shows a partially cutaway side view of a water-cooled semi-automatic MIG/MAG welding torch, and Figure 2 shows its cross-sectional view.

In the figure, 1 is a torch holder, 2 is a torch neck, and 3 is a water-cooled torch. In the torch holder 1, 4 is a torch neck fixing fitting, 5 is a wire supply pipe, 6 is a shield gas supply pipe, and 7 is a cooling water supply pipe. , 8 is a cooling water drain pipe provided with a power supply cable connected to the neck end fitting 21.
Further, in the torch neck part 2, 9 is an insulating tube;
10 is an outer cylinder, 11 is an inner cylinder made of a deformed pipe, 5
12 is a wire supply pipe, 12 is an inner tube, and between the outer cylinder 10 and the inner cylinder 11 is a cooling water supply side passage 13 whose one end is connected to the cooling water supply pipe 7.
A, 13b and cooling water condensate side passages 14a, 14b are formed with one end connected to the cooling water drain pipe 8, and are connected to the shielding gas supply pipe 6 between the inner cylinder 11 and the wire supply pipe 5. Shield gas passage 15
is formed.

Next, the structure of the water-cooled torch 3 will be explained with reference to FIGS. 3 to 5. In these figures,
Reference numeral 20 denotes a wire supply pipe that is continuous with the wire supply pipe 5 arranged in the center, and inside thereof is an inner tube 20 that is continuous with the inner tube 12.
a is arranged. 21 is the net tip metal fitting,
A small diameter portion 22, a medium diameter portion 23, and a large diameter portion 24 are formed, each having a diameter that increases stepwise from the tip to the rear end. A tubular partition pipe 25 is arranged on the outside and inside the large diameter part 24, and the outer wall of the wire supply pipe 20 and the inner wall of the middle diameter part 23 and the partition pipe 25 connect from the middle part to the rear end. Tsute shield gas passage 2
6, and a cooling water passage 27 is formed at the rear end by the outer wall of the partition pipe 25 and the inner wall of the large diameter section 24.
a, 27b are formed. That is, cooling water passage 2
7a and 27b are separated into two by fitting a partition pipe 25 with protrusions 28a and 28b protruding from each other at 180 degrees opposite to each other in the length direction of the outer wall into the large diameter portion 24. One cooling water passage 27a forms a cooling water introduction passage, and its rear end is connected to the tips of the cooling water supply side passages 13a and 13b, and the other cooling water passage 27b forms a cooling water outlet passage. The rear end is connected to cooling water condensate side passages 14a and 14b.
connected to the tip of the

Further, the rear end portion of the shielding gas passage 26 is connected to the tip of the shielding gas passage 15. Reference numeral 29 denotes a nozzle insulator made of an electrically insulating material such as a synthetic resin material, which is disposed outside the medium diameter part 23 and large diameter part 24 of the neck end fitting 21, and a water cooling nozzle 43 is fitted to the outer periphery of the front part thereof. A fitting recess 30 is formed for this purpose, and a fitting recess 31 is also formed on the rear outer periphery.

Further, annular grooves 32 and 33 are formed on the inner and outer peripheries of the rear part of the nozzle insulator 29, respectively, for arranging sealing members, and two sealing members are arranged on the inner and outer peripheries of the front half. annular grooves 34, 35, 36, and 37 are formed.

Reference numeral 38 denotes a water drain hole that penetrates from the inside to the outside in the middle part of the portion where the annular grooves 34, 35, 36, and 37 are provided, and the inside and outside of this water drain hole 38 collect leaked cooling water. Concave grooves 39, 40
form.

Reference numeral 41 denotes a contact tip, which is attached to the tip of the neck end fitting 21 either directly or via a tip adapter.

43 is a water-cooled nozzle, which includes an inner cylinder 44 and an outer cylinder 45.
In order to form a water passage inside the double tube structure, a lid part 46 and a fitting part 47 for the nozzle insulator 29 are provided at the tip and rear ends, respectively, to connect the inner cylinder 44 and the outer cylinder. Close both ends of the gap with 45.

In addition, the inner cylinder 44 has protrusions 48, 48, 48, 48 that continuously protrude in the length direction of the inner cylinder 44 at 90 degrees on the circumference.
These are irregularly shaped pipes provided at intervals of 100°, which fit inside the outer cylinder 45 and connect the inner cylinder 44 and the outer cylinder 4.
The cylindrical gap between 5 and 5 is divided into four, two of which are water supply side passages 49a and 49b, and the other two are condensate side passages 50a and 50b, and these water passages have a water supply side passage at the tip. 49a and condensate side passage 50
a and the water supply side passage 49b are connected to the condensate side passage 50b, and the condensate side passage 50a and the water supply side passage 49b are connected at the rear end. Reference numeral 51 indicates water supply/condensate side passages 49a, 49 in the water cooling nozzle 43.
b, 50a, and 50b are not provided, that is, a drainage hole that penetrates through the protrusion 48 of the inner cylinder 44 and the outer cylinder 45 that is in contact with the protrusion 48. The positional relationship between these drainage holes 38 and 51 may be continuous on a straight line, but the positional relationship between the two is not necessarily restricted. There may be a shift in position in the circumferential direction. Even if there is such a deviation, if the groove 40 is annularly provided on the outer periphery of the nozzle insulator 29, the two will be connected via the groove 40 and water can be drained. A plurality of drain holes 38 and 51 may be provided. 43a is an insulating material for preventing short circuits caused by spatter.

The water cooling nozzle 43 is connected to the nozzle insulator 29
When installed, the inner cylinder 44 is attached to the nozzle insulator 29.
At the same time, the fitting part 47 is fitted into the fitting recess 31 of the nozzle insulator 29.
This is done by fitting the

52 and 53 are cooling water passages 27a and 27, respectively.
A hole for feeding cooling water and a hole for condensing water are formed at the tip of b, and the water cooling nozzle 43 is connected to the nozzle insulator 2.
9, the cooling water supply hole 52 is connected to the water supply side passage 49a, and the condensate water supply hole 5
3 is connected to the condensate side passage 50b.

Further, 54 is a shielding gas passage hole formed at the tip of the shielding gas passage 26, and the wire supply pipe 2
The shield gas passage 26 between the neck tip fitting 21 and the neck tip fitting 21 is connected to the shielding gas passage 55 between the neck tip fitting 21 (or tip adapter 42) and the inner cylinder 44 of the water cooling nozzle 43.

Further, reference numerals 56 and 57 refer to annular grooves 32 and 33 provided on the inner and outer peripheries of the nozzle insulator 29 behind the cooling water supply hole 52 and the condensate hole 53.
A sealing member such as a rubber water leakage prevention O-ring for sealing the gap between the nozzle insulator 29, the neck end fitting 21, and the fitting part 47 of the water cooling nozzle 43, 58; ,59,6
0 and 61 are cooling water supply holes 52 and condensate water holes 5 provided through the neck end fitting 21, the nozzle insulator 29, and the inner cylinder 44 of the water cooling nozzle 43.
3, the nozzle insulator 29
Annular grooves 34, 35, 36, 3 provided on the inner and outer peripheries of
This is a sealing member such as a rubber leak-preventing O-ring for sealing the gap between the nozzle insulator 29 disposed inside the nozzle 7, the neck end fitting 21, and the inner cylinder 44 of the water-cooled nozzle 43.

When welding is performed with the water-cooled welding torch having the above configuration, the cooling water flows through the water-feeding side and condensate-side passages 49a-50a-49b-5 of the water-cooled nozzle 43.
0b to cool the torch. At this time,
Cooling water is supplied through the water supply hole 52 and condensate hole 5 in the middle of the passage.
3, and in these holes 52, 53, the neck end fitting 21, nozzle insulator 29, and inner cylinder 44 of the water cooling nozzle are overlapped, so the pressurized and circulating cooling water flows through these holes 52, 53. It penetrates into the slight gap in the overlapped part from the overlapped end. A sealing member 58,
59, 60, and 61 are arranged in multiple stages and sealed to prevent penetrating water from moving toward the tip of the torch, but since the cooling water is pressurized, cooling water is constantly flowing into the polymerization area. The permeation of water continues, and the permeated water is successively pushed out toward the distal end beyond the seal members 58 and 60 at the subsequent stage. However, such permeated water once accumulates in the grooves 39 and 40 provided in the nozzle insulator 29, and then further accumulates in the grooves 39 and 40 provided in the nozzle insulator 29.
9 and 40 communicate with the atmosphere through the drain holes 38 and 51 and are maintained at atmospheric pressure, so that some of the cooling water accumulated in the grooves 39 and 40 can easily flow through the drain holes 38 and 51 to the water cooling nozzle 43. The water will be drained outside. Seal members 59 and 61 are provided upstream of the water drain holes 38 and 51 to ensure a complete seal and prevent water from leaking into the shield gas passage 55. There will be no mixing of parts.

In particular, in a water-cooled torch, the water-cooled nozzle 43 is
There are many occasions when the wire is welded to the contact tip 41 or removed when cleaning the water cooling nozzle 43. Therefore, when the outer seal members 60 and 61 are attached to the water-cooled nozzle 43, they may be worn out by rubbing against the inner surface of the inner cylinder 44, or they may be scratched by foreign objects that are present during attachment, and the sealing effect may be deteriorated. Although it is easy to deteriorate, a seal member 60,
By providing a plurality of holes 61, the occurrence of the above-mentioned inconvenience is prevented as much as possible and the sealing effect is enhanced, and in addition, the water drain hole 51 drains the permeated water to the outside and cools the cooling water to the shield gas passage 55. This prevents seepage.

Note that in the present invention, for example, the cooling water passage and the like are not limited to the configuration of the embodiment.

As described above, in the water-cooled welding torch of the present invention, the cooling water that permeates into the overlapping part of the nozzle insulator and the net tip fitting and the nozzle insulator and the water-cooled nozzle is drained out of the water-cooled nozzle through the drain hole. Furthermore, since the overlapping portion is sufficiently sealed by a plurality of seal members, it is possible to eliminate inconveniences such as a portion of the cooling water entering the shield gas passage and causing defective welding.

[Brief explanation of the drawing]

Figure 1 is a side view of a water-cooled welding torch, Figure 2 is a sectional view taken along line A-A in Figure 1, Figure 3 is an enlarged side view with some of the main parts cut away, and Figure 4 is Figure 3. FIG. 5 is a sectional view taken along line C--C in FIG. 3. 3...Water cooling torch, 20...Wire supply pipe, 2
1... Net tip fitting, 26... Shield gas passage, 27a, 27b... Cooling water passage, 29... Nozzle insulator, 38... Water drain hole, 43...
Water cooling nozzle, 49a, 49b... Water supply side passage, 5
0a, 50b...Condensate side passage, 51...Drain hole,
55... Shield gas passage, 58, 59, 60,
61... Seal member.

Claims (1)

[Scope of utility model registration request] A neck tip fitting is installed on the outside of the wire supply tube placed in the center, and a contact chip is attached to the tip to form a shielding gas passage and a cooling water introduction/output passage, and a nozzle is installed on the outside of the base of this neck tip fitting. An insulator is provided, and a water cooling nozzle is attached to the outside of this nozzle insulator, which has a cooling water passage formed inside that is connected to the cooling water introduction/output passage of the neck tip fitting through the nozzle insulator. In the water-cooled torch for welding, a plurality of seal members are arranged on the overlapping surface of the neck end fitting and the water-cooled nozzle of the nozzle insulator, which are located on the distal side of the connection between the neck end fitting and the cooling water passage of the water-cooled nozzle. 1. A water-cooled torch for welding, characterized in that the water-cooled torch is provided with a drain hole in a part other than the cooling water passage of the nozzle insulator and the water-cooled nozzle.