JPH032385Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a plasma cutting torch used for plasma cutting, and more specifically to the shape of a tip installed therein.

Prior art and its problems In general, this type of plasma cutting torch has a torch body 1, a
It is composed of a shield cup 2, a chip 3, a gas distributor 4, an electrode 5, an electrode holder 6, a copper pipe 7, etc. Then, a plasma arc 9 is generated between the electrode 5 and the base material 8 to cut the base material 8. At this time, compressed air, for example, is used as the working gas 10 and the cooling gas 11. This compressed air passes from the copper pipe 7 through the electrode holder 6 and from the outside of the gas distributor 4. One side of the compressed air passes straight through the shield cup 2 and the outer periphery of the chip 3 surrounded by the inner wall of the shield cup 2 and the cooling gas 11. released as. The other side is the gas distributor 4.
The working gas 10 passes through the orifice 4a, passes through the inside of the chip 3, and is ejected from the chip hole 3a as the working gas 10.
However, since the plasma arc 9 has an extremely high temperature, even if the cooling gas 11 is used, the chip 3 is significantly worn out. This is even more the case with the touch type cutting method in which cutting is performed while the tip 3 is connected to the base material 8. Note that 12 is a torch switch, and 13 is a torch cable.

Conventionally, a tip shown at 32 in FIG. 6 has been used as a tip for this plasma cutting torch. In FIG. 6, 32a is a tip hole through which the working gas 10 is ejected, 32b is an insertion hole for the electrode 5, and 32c is a stepped portion that engages with the gas distributor 4. Further, 32d is a gas passage for the cooling gas 11.

As mentioned above, the major problem with the conventional plasma cutting torch equipped with the tip 32 shown in FIG. 6 is that the tip 32 is subject to significant wear and tear. .

Purpose of the invention The purpose of the present invention is to provide a plasma cutting torch that can prevent wear and tear of the chip due to overheating, and for this purpose, heat dissipation fins are provided on the outer periphery of the chip.

Embodiment of the invention FIGS. 1 to 3 show an embodiment of the plasma cutting torch of the invention, in which a fourth tip is used instead of tip 3.
The explanation will be given using the chip shown at 31 in the figure.

The chip 31 includes a chip hole 31a for spouting the working gas 10, an insertion hole 31b into which the electrode 5 is inserted in a floating state, and a gas distributor 4.
An internal stepped portion 31c that engages with the shield cup 2, an external stepped portion 31f that extends from the narrow diameter portion 31A to the large diameter portion 31B that engages with the shield cup 2, the narrow diameter portion 31A, and the large diameter portion 3.
Heat dissipation fins 31d' and 31d of 1B are provided, respectively. In addition, each heat dissipation fin 31
Gas passages 31e and 31e are defined between d' and 31d. Then, the electrode 5 is inserted into the electrode holder 6 provided on the torch body 1, the gas distributor 4 and the tip 31 are engaged with each other, and the shield cup 2 is engaged with the stepped portion 31f on the outside of the tip 31. , the female threaded portion of the shield cup 2 is screwed onto the male threaded portion of the torch body 1. Therefore, as a gas path, compressed air supplied from the copper pipe 7 passes through the electrode holder 6, is branched into two directions at the outer periphery of the gas distributor 4, and one side continues straight and is passed through the shield as cooling gas 11. It is ejected through the space between the cup 2 and the outer periphery of the tip 31 surrounded by its inner wall. The other side passes through the orifice 4a of the gas distributor 4, passes through the inside of the tip 31, and passes through the tip hole 31a.
It is ejected from. Chip 31, heat dissipation fin 3
1d and 31d', between the shield cup 2 and the chip 31, that is, the gas passage 31
The cooling gas 11 passing through the chips 3
1 is released while efficiently cooling it.

In the embodiment of the present invention, a plasma cutting torch equipped with a tip 31 provided with heat dissipation fins shown as 31d and 31d' is shown, but the shape of this tip,
That is, various shapes of the cooling fins are conceivable.
Of course, it is desirable that the material be easy to process.
In the case of the embodiment shown in FIG. 4, chip 3
1, the material with the outer diameter of the large diameter part 31B is pulled so that it has a common groove depth for the gas passages 31e and 31e', and then the small diameter part 31A is cut. good. Needless to say, this material is copper-based. Alternatively, as shown in FIG. 5, the chip 31 may be manufactured with a small diameter part 31A and a large diameter part 31B separately by drawing, and then fitted into one body.

As described above, the plasma cutting torch of the present invention is equipped with a tip provided with heat dissipation fins.

Effects of the Invention Since the plasma cutting torch of the present invention has heat dissipation fins on the tip used therein, it is possible to prevent the tip from being worn out due to overheating. Therefore, there are effects such as reducing troubles caused by chip damage and increasing the life of this type of plasma cutting torch.

[Brief explanation of the drawing]

FIG. 1 is an external view of this type of plasma cutting torch. FIG. 2 is a partial sectional view showing the main part of FIG. 1. FIG. 3 is an exploded perspective view of FIG. 2. FIG. 4 is a perspective view and a cross-sectional view of the chip that constitutes the main body of the present invention. FIG. 5 is a sectional view of another embodiment of the present invention. FIG. 6 is a perspective view and a sectional view of a conventional example. 1...Torch body, 2...Shield cup, 3
1... Chip, 31d... Heat dissipation fin, 4...
Gas distributor, 5...electrode, 6...electrode holder, 7...copper pipe.

Claims (1)

[Scope of utility model registration request] Insert the electrode into the electrode holder provided on the torch body, engage the gas distributor and the tip, and engage the shield cup with the step on the outside of the tip, and then connect the shield cup to the threaded part of the torch body. A plasma cutting torch configured by screwing and discharging one circuit of gas into a working gas and a cooling gas, the tip having an insertion hole into which an electrode is inserted, and an interior that engages with a gas distributor. It has an external step part that extends from the small diameter part to the large diameter part that engages with the shield cup, and the small diameter part and the large diameter part are provided with heat dissipation fins, and the space between the heat dissipation fins is A plasma cutting torch characterized by a cooling gas passage.