JPS601899Y2 - welding torch - Google Patents

Description

[Detailed description of the invention] The present invention relates to a semi-automatic or automatic welding torch of a type in which a welding wire is guided by a conduit tube inserted into a conduit cable, and in particular, to allow the welding wire to be fed without any hindrance. This provides a welding torch that can perform

Conventionally, in this type of welding torch, the end of the conduit tube on which the welding wire is inserted is fitted and fixed to one end of the conduit cable, but the end on the welding nozzle side is replaced. Due to necessity, the conduit tube is not fixed in particular, but is simply abutted against the end of the torch body or a protrusion provided in the passage to prevent the conduit tube from dancing in the passage through which the welding wire is inserted. ing.

However, it has been found that when actual welding is performed, the conduit cable is bent in various directions, so that the length of the conduit cable is not always constant and varies.

In other words, if the cable is twisted in the same direction as the conduit cable, the length of the cable will shrink, if it is twisted in the opposite direction, the cable will lengthen, and if it is pulled in the length direction, the cable will further lengthen. Become.

On the other hand, since the length of the conduit tube remains constant regardless of changes in the length of the cable, when the conduit cable is in a stretched state, the constraint on the tip of the conduit tube is released and the tip can pass through the passage. This may cause the welding wire to dance within the wire, making the feeding of the welding wire unstable.

In addition, the conduit tube may become unstable when feeding the welding wire due to wear on its inner surface or clogging due to lumps or chips from the welding wire, so it is necessary to periodically replace the conduit tube. There is sex.

However, as conduit cables increase in steady state length after years of use, it is necessary to change the length of the Funjit tube to match the change in conduit cable length each time the conduit cable is replaced. Cutting conduit tubes to the appropriate length was a tedious task for workers.

If the conduit tube was made too short during cutting, the conduit cable would become stretched as described above, which could result in unstable welding wire feeding.

An object of the present invention is to provide a welding torch that eliminates the drawbacks of the conventional welding torches described above.

By providing a conduit tube pressing mechanism that always presses at least one end of the conduit tube in the axial direction in the passage in which the welding wire is guided, the present invention enables welding even when the length of the conduit cable changes. To provide a welding torch which allows feeding of a welding wire without any trouble and allows easy replacement of a conduit tube.

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

FIG. 1 shows a partial sectional view of a welding torch to which the present invention is applied.

In the figure, 1 is a grip, and 2 is a torch body with one end inserted into the grip 1.

A welding nozzle 3 is attached to the other end of the torch body 2.

4 is a tubular conduit cable, and the end of the conduit cable 4 on the opposite side from the grip 1 is provided with a power supply cable 5a and a gas supply cable 5b, and the end on the grip 1 side is provided with a caulking metal fitting 7. It is fixed to the metal tubular body 8 by.

6 is a conduit tube inserted into the conduit cable 4.

FIG. 2 shows an enlarged view of the sectional portion shown in FIG. 1, and the main parts of this embodiment will be explained below with reference to FIG.

The conduit cable 4 has a central pipe 4a arranged in the center.
This is due to the power feeding cable conductor 4b attached to the outer periphery of the central tube 4a, and the flexible insulating coating 4C covering the outer periphery of the cable conductor 4b.

At the end of the tubular body 8 on the conduit cable 4 side, there is a large-diameter first hole 8a that opens in the end surface, and this first hole 8a.
a second hole 8 that extends concentrically with the first hole 8a continuously from a
b, and the first and second holes 8 are continuous with this second hole 8b.
A third hole 8c is formed that extends concentrically with a and 8b.

The second hole 8b is formed with a smaller diameter than the first hole 8a, and the third hole 8C is formed with a smaller diameter than the first hole 8a.
It is formed to have a larger diameter than b and opens at the end surface of the tubular body 8 on the connection fitting 9 side.

A protective guide pipe 10 having the same inner diameter as the second hole 8b is fitted into the first hole 8a.

The center tube 4a of the conduit cable 4 is fitted onto the outer periphery of the small diameter portion 10a of the guide pipe 10, and the cable conductor 4b is arranged on the outer periphery of the small diameter portion 8d of the tubular body 8.

The conduit cable 4 is fixed to the tubular body 8 by crimping the cable conductor 4b with the crimp crimping fitting 7.

A first hole 9a with a female screw that opens on the end surface is formed at the end of the metal connection fitting 9 on the tubular body 8 side. It is screwed into a male thread provided on the outer periphery of the end.

Further, a second hole 9b is formed concentrically with the third hole 8c of the tubular body 8, continuing from the first hole 9a.

The second hole 9b is formed to have a smaller diameter than the third hole 8c of the tubular body 8, and extends to near the middle of the connecting fitting 9.

Further, a third hole 9c is connected to the second hole 9b, and a third hole 9c is also connected to the second hole 9b.
A fourth hole 9d is formed continuously with the hole 9c, and the diameter of the third hole 9C decreases at a constant inclination angle toward the fourth hole 9d.

The third hole 9c and the fourth hole 9d are formed concentrically with the second hole 9b.

Reference numeral 11 denotes a tubular sliding member having a head portion 11a and a neck portion 11b, and a first hole 11c with a chamfered opening end portion 11C is formed in the head portion 11a.
The end portion of a spring-like conduit tube 6 is fitted into the inside c.

A hole 11d is formed in the neck portion 11b and opens on the end surface opposite to the head portion 11a.The hole 11c and the hole lid are tapered so that the diameter gradually decreases from the head portion 11a side toward the neck portion 11b side. They communicate concentrically through the hole 11e.

The head 11a of the sliding member 11 is connected to the third hole 8 of the tubular conductor 8.
It has an outer diameter dimension that allows it to slide inside the neck part 11.
b has an outer diameter dimension that allows it to be inserted and slid into the second hole 9b of the connection fitting 9.

Reference numeral 12 denotes a spring as a biasing means for biasing the sliding member 11.

Due to the elastic force of the spring 12, the head 11 of the sliding member
a is urged in the axial direction, so that the end of the conduit tube 6 inserted into the hole 11C is always pressed in the axial direction.

In this embodiment, the sliding member 11 and the spring 12 constitute a conduit tube pressing mechanism.

The length of the conduit tube 6 is such that when the conduit cable 4 expands and contracts in the axial direction during work, the sliding member 11 slides and the end of the conduit tube 6 does not come out from the hole 11c of the sliding member 11. The length should be set to .

The welding wire is fed through the conduit tube 6 and guided into the torch body 2 through the hole 11e in the sliding member 11 and the holes 9b, 9c and 9d in the 11b1 connection fitting 9.

If the length of the conduit cable 4 is extended during work, the conduit tube 6 has one end fixed to the end of the conduit cable 4 on the side where the welding wire is inserted. The end portion fitted into 11c will move toward the conduit cable 4 side.

In this case, the sliding member 11 biased by the spring 12 slides within the hole 8c of the tubular member 8 by the amount that the conduit tube 6 moves, and continues to press the end of the conduit tube 6 in the axial direction. .

Therefore, there is an advantage that even if the length of the conduit cable is increased, the welding wire can be fed without any problem.

Conversely, when the length of the conduit cable 4 is shortened, a force is applied to the conduit tube 6 that tries to move the end of the conduit tube 6 fitted into the sliding member 11 toward the connection fitting 9. Since the sliding member 11 slides to a position balanced with the elastic force of the spring 12, it is possible to prevent the conduit tube 6 from being unnecessarily bent inside the conduit cable 4.

Furthermore, with this structure, the elongation of the length of the conduit cable due to long-term use can be compensated for by the sliding of the sliding member 11, and when replacing the conduit tube 6, it is possible to compensate for the elongation of the length of the conduit cable due to long-term use. The conduit tube can be replaced by simply inserting a conduit tube with a predetermined length without the need for the troublesome work of lengthening the conduit tube by the length of the conduit cable that has been stretched due to use. This has the advantage of significantly reducing the burden on workers.

FIG. 3 shows another embodiment of the present invention in which a conduit tube pressing mechanism is provided in the passage within the end of the conduit cable on the side into which the welding wire is inserted.

Reference numeral 13 denotes a connection terminal metal fitting constituting the end of the conduit cable, and a first hole 13 opening in the end surface is provided inside the metal fitting.
a, a second hole 13b continuous with the first hole 13a, and a third hole 13c continuous with the second hole 13b.

The first hole 13a has a larger diameter than the second hole 13b, and the third hole 13c has a smaller diameter than the second hole 13b, and the name tags 13a to 13c are arranged concentrically.

Reference numeral 14 denotes a liner for guiding a welding wire, and the liner 14 consists of a head 14a and a neck 14b. Inside the head 14a, there is a tapered hole 14c that opens at the end surface and reduces in diameter at a constant inclination angle. is formed.

This tapered hole 14C communicates with a hole 14d formed in the neck portion 14b and opened at the end surface opposite to the head.

The head 14a of the liner 14 is connected to the hole 1 of the connection terminal fitting 13.
3a and is fixed.

Reference numeral 15 denotes a sliding member that slides within the hole 13a in the connection terminal fitting 13, and this sliding member is composed of a head portion 15a and a neck portion 15b.

A hole 15c into which the end of the conduit tube 6 is inserted is formed in the head 15a of the sliding member 15 so as to open at the end surface on the conduit tube 6 side.

The hole 15c extends to approximately 1/3 of the head 15a, and the hole 15c extends to approximately 1/3 of the head 15a, and the hole 15c is provided in the remaining portion of the head 15a and inside the neck 15b.
A hole 15d that is continuous with the conduit tube 5c and opens on the side opposite to the conduit tube 6 is formed.

The hole 15d has a smaller diameter than the hole 15c and is formed concentrically with the hole 15c.

The neck portion 14a of the liner 14 is slidably fitted into the hole 15d.

Reference numeral 16 denotes a spring as a biasing means, which biases the sliding member 15 to constantly press the end of the conduit tube 6 in the axial direction.

17 is a protective cover having insulation properties.

In this embodiment, the end of the conduit tube 6 on the side of the torch body is abutted against and locked in the abutting portion, similar to the conventional device.

The length of the conduit tube 6 should be such that even when the length of the conduit cable changes, the end of the conduit tube 9 is always pressed in the axial direction by the sliding of the sliding member 15. .

Welding wires are inserted into the holes 14c and 14d1 of the liner 14.
It passes through the hole 15d of the sliding member 15 and is fed to the conduit tube 6.

The operation is the same as that of the embodiment shown in FIG. 2, so a description thereof will be omitted.

This embodiment has the advantage that maintenance is easy because the sliding member 15 and spring 16 can be easily replaced.

Furthermore, conduit tubes of different diameters can be used simply by replacing the sliding members.

In the above embodiment, the conduit tube pressing mechanism is provided at or near the end of the conduit cable, but it is not limited to the position shown in the embodiment. Alternatively, the conduit cable pressing mechanism may be provided within the passage formed within the end of the welding nozzle.

Also, press the two ends of the conduit tube.
Of course, two pressing mechanisms may be arranged at both ends of the conduit tube.

Furthermore, the conduit cable may be divided and a conduit tube pressing mechanism may be provided between the divided conduit cables.

However, in this case, two conduit tubes are required.

Furthermore, in each of the above embodiments, the sliding member is urged by a spring to press the end of the conduit tube, but it goes without saying that the pressing mechanism is not particularly limited to the embodiments.

For example, a locking portion may be provided directly on the spring without using a sliding member, and the end of the conduit tube may be locked by the locking portion to press the end of the conduit tube in the axial direction. .

As described above, according to the present invention, when the length of the conduit cable changes during welding work, the end of the conduit tube is prevented from dancing in the passage, and the welding wire can be fed without any problem. It has the advantage of being able to

In addition, when replacing conduit tubes, a predetermined length of conduit tube can be replaced without any troublesome work such as cutting, making the conduit tube replacement work easier and easier for workers. This has the advantage of reducing the burden.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of a welding torch according to an embodiment of the present invention, Fig. 2 is a partially enlarged sectional view of Fig. 1, and Fig. 3 is a partial sectional view showing another embodiment of the present invention. It is. 1...Grip, 2...Torch body,
3... Welding nozzle, 4... Conduit cable, 6... Conduit tube, 8...
... Tubular member, 9 ... Connection fitting, 11, 1
5...Sliding member, 12, 16... Spring.

Claims (1)

[Claims for Utility Model Registration] 1. A utility model comprising: a tubular conduit cable; a conduit tube inserted from one end of the conduit cable to guide a welding wire to a predetermined position; and a welding nozzle from which the welding wire is guided. , a welding torch having a passage for guiding the welding wire formed between the one end and the tip of the welding nozzle, the welding torch having a passage for guiding the welding wire and at least one of the conduit tubes; A welding torch characterized in that a conduit tube pressing mechanism is provided in the passageway to constantly press the end portion in the axial direction. 2. The conduit tube pressing mechanism includes a tubular sliding member that engages one end of the conduit tube and is slidably fitted into the passageway, and the sliding member for pressing the conduit tube in the axial direction. The welding torch according to claim 1, which is characterized by comprising a biasing means for biasing the welding torch.