JP2687580B2 - Welding gun protection device for arc welding machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a welding gun of an arc welder, for example, a stud welder, and more specifically, protects the welding gun from the effects of welding spatter or high heat generated during welding. For equipment.

(Prior Art) FIG. 4 shows a welding gun of a conventional stud welding machine.

As shown, a piston 3 is attached to the lower end of a cylinder 2 which is vertically movable in a housing 1 of a welding gun.
A bolt receiver 4 for receiving a bolt or a pin B (hereinafter, simply referred to as a bolt) as a welding material which is fed through a feeder tube (not shown) in the ascending state, the bolt B is attached to the lower end of the bolt receiver 4. A collet chuck 5 for holding is attached by a collet nut 6. The bolt receiver 4 and the collet chuck 5 are both made of a conductive material and are connected to the welding power source device. That is, the bolt receiver 4 and the collet chuck 5 are electrodes of the welding power source device.

On the other hand, at the upper portion of the collet chuck 5 and the lower portion of the bolt receiver 4, a cylindrical portion of the confirmation sensor 7 made of a conductive material for detecting that the welding posture is adjusted by contacting the body-grounded base material A is provided. It is arranged so as to surround it through a cylindrical guide bush 9 made of an insulating material, and the cylindrical portion of the confirmation sensor 7 is connected and fixed to the lower end of the housing 1 by a connecting bolt 10. The guide bush 9 has a function of interrupting the energization between the confirmation sensor 7 and the collet chuck 5 and guiding the vertical movement of the collet chuck 5. Further, the confirmation sensor 7 is connected to the welding control device. That is, the confirmation sensor 7 is one electrode of the welding control device, and has a leg piece 8 extending downward in parallel with the collet chuck 5 at a part of the electrode, and the leg piece 8 is used as a base for welding. By contacting the material A, it is confirmed that the welding posture has been adjusted.

Then, the welding work with the welding gun having such a configuration is performed as follows.

The bolt B to be welded is dropped from the bolt receiver 4 to the collet chuck 5 and held at the tip of the chuck when the piston 3 of the cylinder 2 is pulled up. In this state, the piston 3 descends and presses the bolt B from above so that the tip of the piston protrudes from the tip of the chuck by a predetermined amount, and under this condition, the entire gun with the housing 1 descends toward the base material A.

When the bolt B contacts the base material A and the leg piece 8 of the confirmation sensor 7 contacts the base material A, the lowering of the entire gun is stopped based on the detection signal of the confirmation sensor 7 and the start signal Is output to supply a welding current to the bolt B, and at the same time, the cylinder 2, the bolt receiver 4, the collet chuck 5, and the bolt B are pulled up by a predetermined amount while generating a pilot arc. In this state, the surface of the base material is melted by the arc current, and after the melting, the entire member is lowered again to press the bolt B onto the base material A. Then, after a lapse of a predetermined time, the entire welding gun is lifted to complete the stud welding.

(Problems to be solved by the invention) However, spatter is generally generated during welding work,
This spatter scatters toward the outer periphery of the collet chuck 5 which is the electrode of the welding power source device and the leg 8 of the confirmation sensor 7 which is one electrode of the welding control device. When a large amount of spatter adheres to or welds to the collet chuck 5 or the leg pieces 8 of the sensor 7, discharge may occur between them, and if such abnormal discharge occurs, it is impossible to perform a predetermined welding operation. Of course, the electrode material will be damaged. Therefore, in order to prevent accidental damage to the electrode material, it is necessary to frequently perform cleaning to remove spatter.

However, no special measures have been taken regarding the cooling of the electrodes, and it is usually left to natural cooling, so the electrode material itself becomes a considerably high temperature state by continuous work, and this exceeds 1000 ° C. When such high-heat sputter adheres, it is not merely a simple attachment, but also melts into the electrode material and is welded, which makes it extremely difficult or impossible to remove it.

Therefore, in view of the above problems, it is an object of the present invention to provide an apparatus effective in protecting a welding gun, particularly an electrode material, from spatter and high heat generated during welding.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a welding material holding member that holds a welding material and functions as an electrode of a welding power source device, and a predetermined distance between the welding material holding members. And a confirmation sensor that functions as an electrode of a welding control device that detects that the welding posture is adjusted by abutting against the base material while being installed in parallel, and the confirmation sensor includes pressure gas The welding material holding member is characterized in that an injection port is provided for injecting from the lateral direction toward the tip.

(Operation) According to the present invention configured as described above, the spatter of the welding power source device is generated by causing the jet gas to act so as to blow the spatter generated between the welding material and the base metal during the welding operation to the side. Suppression of scattering toward the welding material holding member, which is an electrode, and the confirmation sensor, which is an electrode of the welding control device, and because pressure gas is jetted from the confirmation sensor side in particular, it is rational for spatter scattering to the confirmation sensor side. It becomes possible to suppress it. Further, the jet gas forcibly cools the electrode material at the same time as the spatter is blown off, and prevents the electrode material from melting when spatter adheres, that is, welding and holding the welding gun.

(Example) Hereinafter, an example of the present invention will be specifically described with reference to the drawings.

<Example 1> First, Example 1 will be described with reference to Figs. 1 and 2. The same members as those in the prior art shown in FIG. 4 are designated by the same reference numerals and the description thereof will be omitted, and a welding gun protection device will be described. As shown in the figure, the guide bush 9 made of an insulating material has a protection piece 11 having substantially the same width along the inner surface of the leg piece 8 of the confirmation sensor 7 which is one electrode of the welding control device. The lower end of the protection piece 11 is set to be substantially at the same height as the lower end of the collet chuck 5.

An injection port for pressurized gas (for example, air, nitrogen gas, carbon dioxide, etc.) is provided above the leg piece 8 of the confirmation sensor 7.
12 is formed, and the injection port 12 is connected to a pressure gas supply tube 13 communicating with a pressure gas supply source. Further, a guide groove 14 having a U-shaped cross section or a semi-circular shape which communicates with the injection port 12 is formed downward at the upper end portion on the contact surface side of the protection piece 11 with the leg piece 8. 14 is leg 8
A gas passage (15) is formed in cooperation with the inner surface of which the lower end is opened. A curved guide surface 16 is formed on the inner surface of the lower end of the leg piece 8 for guiding the gas injected from the gas passage 15 toward the collet chuck 5. Further, a diverting port 17 is concentrically formed in a portion of the protective piece 11 facing the injection port 12, and the diverting port 17 faces the slit 5a of the collet chuck 5 as shown in FIG.

In the present embodiment configured as described above, when the welding work of the bolt B to the base material A is started, the pressure gas pressure-fed by the compressed gas supply source is discharged from the ejection port 12 of the confirmation sensor 7.
And is partially sprayed from the lower end of the leg piece 8 toward the welding site in a substantially horizontal direction through the gas passage 15. Most of the spouting gas blows off spatter generated during welding to the opposite side of the leg piece 8, and the spatter is scattered to the leg piece 8 side of the confirmation sensor 7 or the outer peripheral side of the collet chuck 5 and adheres to them. Suppress. In addition to suppressing the random scattering of spatter, the pressurized gas also prevents the leg pieces 8 of the confirmation sensor 7 and the collet chuck 5 from moving.
Especially cool the tip.

Further, a part of the pressure gas jetted from the jet port 12 is jetted toward the collet chuck 5 from the diversion port 17 formed in the protection piece 11. This gas acts not only to prevent the spatter from scattering around the collet chuck 5, but also cools the collet chuck 5 from its outer peripheral surface or from the inner surface through the slit 5a.

Regarding the injection timing of the pressure gas, for example, the injection is started immediately after the welding posture confirmation signal output when the leg piece 8 of the confirmation sensor 7 comes into contact with the base metal A is output or after an appropriate interval. It is determined that the valve control of the pressure gas feeding system is performed such that the injection is ended at the same time as the end. However, this is just an example, and it can be appropriately changed as necessary. For example, if the welding gun is set to inject at the stage of descending toward the base metal A, the welding of the base metal A is performed. The surface to be cleaned can be cleaned.

<Second Embodiment> Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the guide bush 9 has a cylindrical shape as in the conventional case, and the ejection port 12 for the pressurized gas is formed in the lower portion of the leg piece 8 in the confirmation sensor 7. With such a configuration, there is an advantage that the structure is made compact as compared with the first embodiment. Then, the spatter generated during welding is blown to the opposite side of the leg piece 8 to suppress the adhesion of the spatter to the leg piece 8 and the collet chuck 5, and the leg piece 8 and the collet chuck 5 can be cooled. The same or similar effect can be expected.

Not only the welding gun of the stud welder of the present invention, but also other types of arc welders can be applied as long as the welding gun includes a confirmation sensor.

(Effects of the Invention) As described in detail above, according to the present invention, the welding material holding member, which is the electrode of the welding power source device, and the electrode of the welding control device that detect that the welding stance has been adjusted by spatter generated during arc welding That is, it is possible to reduce adhesion to the periphery of the confirmation sensor, suppress abnormal discharge between the electrodes due to adhesion of spatter, and protect them. Also,
By preventing the spatter from welding to the electrode by the forced cooling and protecting the electrode from the bad influence of high heat, it is possible to prevent early wear and damage and improve the durability as a welding gun. Further, since the adhesion of spatter to the electrode is reduced and spatter welding is prevented, the number of cleanings for removing spatter can be significantly reduced and the maintenance can be simplified.

[Brief description of the drawings]

1 is a vertical sectional view showing a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a vertical sectional view showing a second embodiment of the present invention. [Fig. 4] is a vertical sectional view showing a conventional example. 5 ... Collet chuck, 7 ... Confirmation sensor 8 ... Leg piece, 9 ... Guide bush 12 ... Injection port

Claims (1)

(57) [Claims] 1. A welding material holding member that holds a welding material and that functions as an electrode of a welding power source device, and a welding material holding member that is installed in parallel at a predetermined interval and is in contact with a base material. A confirmation sensor that functions as an electrode of a welding control device that detects that the welding posture has been adjusted by the injection port, and the confirmation sensor ejects pressure gas from the lateral direction toward the tip of the welding material holding member. Welding gun protection device for arc welders.