JPH0140628Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a side shield in which a shielding gas supply tube is provided on the side of a welding torch, and a spatter removal sliding member is provided that is slidable on the inner wall of the gas nozzle of the shielding gas supply tube. The present invention relates to a type of welding torch.

Generally, in arc welding work, a considerable amount of spatter is generated during welding, and this spatter adheres to the inner wall of the gas nozzle, disrupting the flow of shielding gas and causing poor gas shielding conditions at the welding area.
Often causes weld defects. For this reason, when welding is stopped, a sliding member for removing spatter is reciprocated along the inner wall of the gas nozzle to remove spatter adhering to the inner wall of the gas nozzle. By the way, conventionally,
For example, as shown in FIG. 1, a so-called air cylinder 50 is connected to the rear part of the shielding gas supply tube 4', and a sliding member 14' for removing spatter is disposed at the tip of this cylinder rod to stop welding. At times, the cylinder rod was moved back and forth to remove spatter. That is, during welding, the cylinder rod supporting the spatter removal sliding member is maintained in a retracted state, and the shielding gas is supplied from the connection port 9' into the shielding gas supply cylinder 4',
In addition, spatter adhering to the inner wall of the gas nozzle 13 was removed by reciprocating the cylinder rod during appropriate non-welding periods. Conventionally, welding torches require two lines of piping, one for compressed air to operate the cylinder rod and the other for gas supply piping to supply shielding gas, which is a hassle. Moreover, flexible hoses are usually used for this piping, but these flexible hoses can become sagging and interfere with other machinery.
For this reason, there were space constraints when installing the welding torch, making the machine complex and expensive.

Furthermore, the gas nozzle and the shielding gas supply cylinder are heated by the arc heat generated during welding, and the air cylinder connected to the shielding gas supply cylinder is also successively heated. For this reason, the air-tightness of the air cylinder tends to become poor, and when the air-tightness becomes poor in this way, air gets mixed into the shielding gas, leading to welding defects. Particularly in automatic welding equipment, which is used frequently, air cylinders tend to have poor airtightness, and even if air gets mixed into the shielding gas, welding is performed automatically despite this, so air contamination can occur. It is difficult to notice this condition, and therefore, welding is performed with air mixed in, and there is a risk that secondary disasters may occur due to defective welding.

An object of the present invention is to provide a side shield type welding torch that eliminates the above-mentioned conventional drawbacks.

The present invention will be described in detail below with reference to the illustrated embodiments. In FIG. 2, 1 is a welding torch main body, 2 is an electrode wire that is supplied to the welding part through the approximate axis of the welding torch main body 1 by a wire feeding device (not shown), and 3 is a shielding gas supply cylinder 4. A connecting rod connecting the welding torch main body 1, 5 a cylindrical member connected to the supply cylinder 4, 6 a lid member disposed at the end of the cylindrical member 5, 7 an axial direction of the supply cylinder 4 The moving member 7 is composed of a large diameter portion 701 and a rod member 702, and is connected to the supply tube 4 and the cylindrical shape by appropriate airtight members 801 and 802, such as an "O" ring, respectively. Part 5
It is formed to be movable in an airtight manner. 9 and 10 are the supply tube 4 and the lid member 6, respectively.
The first gas connection port 9 is a space 11 surrounded by the supply cylinder 4, the cylindrical member 5, and the large diameter portion 701 of the moving member.
The second gas connection port 10 is communicated with a space 12 surrounded by the cylindrical member 5, the lid member 6, and the large diameter portion 701 of the moving member. Reference numeral 13 denotes a gas nozzle that is detachably disposed at the front end of the supply tube 4, and is screwed, for example. Reference numeral 14 denotes a spatter removal sliding member that is detachably supported at the front end of the moving member 7 and comes into sliding contact with at least the inner wall of the gas nozzle 13. For example, the sliding member 14 is screwed onto the front end of the moving member 7. It is supported via an orifice 15 that is attached to the shaft. Furthermore, the movable member 7 and the orifice 15 have the movable member 7 at the retracting end, that is,
A gas passage 16 is provided near the end in the _X2 direction and communicates the first gas connection port 9 with the space of the gas nozzle 13 that opens outward. 1
7 is a dog supported at the end of the movable member 7 that hermetically passes through the lid member 6; 18 is a detector operated by the dog 17; 19 is a cover for the dog 17 and the detector 18; 20 is a shielding gas It is a switching valve, such as a two-position, four-way solenoid valve, that appropriately communicates the supply source with the first and second gas connections 9, 10.

In the above configuration, if the switching valve 20 is maintained in the state shown in FIG. 2 and the shielding gas is supplied,
The shielding gas is connected to the first gas connection port 9 and the gas passage 1.
6, the gas flows into the inside of the gas nozzle 13 and is supplied to the welding part. That is, in this state, while feeding the electrode wire 2 by a wire feeding device (not shown),
Welding is performed by appropriately supplying power to the welding wire 2. After welding is completed, when the spool of the switching valve 20 is switched to another position, the shielding gas flows into the space 12 from the second gas connection port 10, and the moving member 7 is moved in the _X1 direction. The moving member 7 stops with the large diameter portion 701 of the moving member 7 in contact with the reduced diameter step portion of the supply tube 4 . In this way, the moving member 7
When moving in the _X1 direction, the spatter removal sliding member 14 supported on the front end of the moving member 7 also slides in the _X1 direction while coming into contact with the inner wall of the gas nozzle 13.
Spatter adhering to the gas nozzle 13 is removed. After this, when the switching valve 20 is operated again to the state shown in FIG.
The gas flows into the space 11 from the gas connection port 9 . In this case, since the gas passage 16 is moving in the _X1 direction, the shielding gas is not supplied into the gas nozzle 13 but flows into the space 11. The pressure of the shielding gas flowing into the space 11 causes the moving member ₇ to move
move in the direction. The moving member 7 is at the retracting end, that is, X ₂
When located near the direction end, the gas passage 16 that communicates with the inside of the gas nozzle 13 communicates with the space 11, and the shielding gas flows inside the gas nozzle 13, thereby pressing the moving member 7 in the _X2 direction. The pressure of the shielding gas decreases, and the moving member 7 stops at an appropriate position in the _X2 direction. Note that the moving member 7 _is
When moving in the direction, kinetic frictional force due to the contact of each part acts, but when moving, inertia force of the moving member 7 is generated, so in most cases, as shown in Fig. 2, the movement is The moving member 7 stops in a state where the large diameter portion 701 of the member and the lid member 6 are in contact with each other.

Welding is carried out as described above in the state shown in FIG. Note that by detecting this state using, for example, the detector 18 and inputting this output signal to the welding control device, welding can be performed reliably. Despite this, when the switching valve 20 is operated so that the shielding gas supply source and the first gas connection port 9 communicate with each other, welding control is performed such that, for example, a variable timer is provided to enable welding after a set time. can be connected to the device. In the above description, the gas supply tube 4 and the cylindrical member 5 may be formed integrally, or the cylindrical member 5 and the lid member 6 may be formed integrally. Of course, at least the gas supply cylinder 4 can be forcibly cooled. Further, the switching valve 20 can be of any suitable type.

As described above, according to the present invention, the spatter removal work on the inner wall of the gas nozzle is carried out by switching the flow path of the shielding gas during non-welding and activating the cylinder mechanism by the pressure of the shielding gas to connect the sliding member for spatter removal and the inner wall of the gas nozzle. Because it is carried out by sliding movement, the airtightness of the cylinder mechanism becomes poor,
Even if gas leaks out of the designated space, the gas that operates the cylinder mechanism is shielding gas, so this leaked gas will not have any negative effect on the welding results, ensuring good welding results at all times. can be obtained. In addition, the piping required for welding and spatter removal is accomplished by connecting the shielding gas piping to the two connection ports, making piping work easy, and since the piping around the torch is simplified, welding This alleviates the constraints on the location when disposing the welding torch, and in turn, the structure of the welding device can be simplified. Of course, it is only necessary to install one switching valve for the shielding gas, so the equipment cost is low, and especially in automatic welding equipment, it is only necessary to control a single switching valve, and as mentioned above, it is possible to use it as a torch. This method is particularly effective because it not only alleviates the constraints on the location of the welding process, but also ensures that good welding results are always obtained as described above.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a conventional example, and FIG. 2 is a longitudinal cross-sectional view showing main parts of an embodiment of the present invention. 4... Gas supply cylinder, 6... Lid member, 7... Moving member, 9, 10... Gas connection port, 13... Gas nozzle, 14... Sliding member for spatter removal, 16...
...gas passage.

Claims (1)

[Scope of utility model registration request] A side-shield type welding torch is provided with a shield gas supply tube on the side of the welding torch, and a spatter removal sliding member that is slidable on the inner wall of the gas nozzle of the shield gas supply tube. A cylinder mechanism is constituted by a movable member movable in the axial direction of the supply cylinder, a lid member at the rear of the supply cylinder, and two gas connection ports, and the sliding member for spatter removal is provided at the front end of the movable member. established,
and a side shield type welding torch, wherein a gas passage communicating with one of the gas connection ports and a space of a gas nozzle opening outward is formed in a state in which the moving member is located near the retracting end.