JPH10166156A - Plasma cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain safety of an operator by providing a means for removing waste gas, which is produced in cutting a nonmetallic object such as FRP using a plasma jet, and thereby preventing the waste gas from dispersing. SOLUTION: The device is provided with a power source 4 for applying a prescribed voltage between a nozzle 2 and an electrode 3, a cover 7 for preventing the dispersion of waste gas 6 produced at the time of cutting an object 5, a suction tube 8 for sucking the waste gas 6, a waste gas treating device 9, and a suction pump 10; at the time of cutting an object 5, the end face 7a of the cover 7 is abutted on the surface of the object 5, with a prescribed voltage applied between the nozzle 2 and the electrode 3 by the power source 4, and with an operating gas 15 supplied to the flow-out hole, so that a plasma jet is generated from the flow-out hole 14, cutting the object 5, while the waste gas 6 produced is prevented by the cover 7 from dispersing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a plasma cutting apparatus.

[0002]

2. Description of the Related Art Generally, when roughly cutting a non-metallic object 40 such as a waste ship made of FRP, a plasma cutting device,
In particular, a non-transfer type (also called non-transfer plasma type) plasma cutting device 41 is used.

Conventionally, as shown in FIG. 4, a plasma cutting apparatus 41 of this kind is provided in a nozzle 42 so as to face a nozzle (for example, made of copper) 42 and a small-diameter outflow hole 43 formed at the tip of the nozzle 42. An electrode (for example, made of tungsten) 44 is provided, and a predetermined voltage is applied between the nozzle 42 and the electrode 44 from the power supply unit 45, and a working gas 46 such as argon is supplied to the outlet 43 so that the outlet 43 43
Generates a plasma jet, and thereby cuts the object 40 to be cut.

[0004]

In the plasma cutting apparatus 41, when cutting a nonmetallic object 40 such as FRP using a plasma jet, exhaust gas (fume) is generated.

However, in the plasma cutting device 41,
Since there is no means for removing the exhaust gas, it is dangerous for an operator to aspirate these substances. Therefore, an object of the present invention is to provide a plasma cutting device that can solve the above-mentioned problems.

[0006]

Means for Solving the Problems A means for solving the problem according to the present invention comprises a metal nozzle and an electrode provided in the nozzle so as to face an outlet hole provided at the tip of the nozzle. A predetermined voltage is applied between the electrode and the electrode, and a working gas is supplied to the outlet, so that a plasma jet is generated from the outlet.
A cover for preventing scattering of exhaust gas generated at the time of cutting an object to be cut is provided, and a suction pipe for sucking the exhaust gas and guiding the exhaust gas to a predetermined location is attached to the cover.

According to this configuration, when cutting the object to be cut,
By applying a predetermined voltage between the nozzle and the electrode and supplying the working gas to the outlet, a plasma jet is generated from the outlet, and the exhaust gas generated when cutting the cut object is prevented from scattering by the cover Then, it is sucked by the suction pipe and discharged to a predetermined place.

[0008] Further, by mounting wheels that roll on the surface of the object to be cut in contact with the cover, the nozzle can be freely moved along the surface of the object to be cut.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a plasma cutting apparatus according to an embodiment of the present invention will be described with reference to the drawings.

First, a first embodiment of the present invention will be described with reference to the sectional view of FIG. The plasma cutting device 1 according to the first embodiment of the present invention includes a copper nozzle 2, an electrode 3 provided in the nozzle 2, and a device for applying a predetermined voltage between the nozzle 2 and the electrode 3. A power supply unit 4, a cover 7 for preventing scattering of exhaust gas (fume) 6 generated when the object 5 is cut, a suction pipe 8 for sucking the exhaust gas 6 and guiding it to a predetermined place, and connected to the suction pipe 8 And a suction pump 10.

The nozzle 2 has an outer wall 11 having a double structure, and a cooling passage 13 through which cooling water 12 passes.
Is formed, and a small-diameter outflow hole 1
4, a gas passage 16 for disposing the electrode 3 and supplying a working gas 15 such as an argon gas toward an outflow hole 14 is formed inside the nozzle 2.

The electrode 3 is disposed in the gas passage 16 so as to face the outflow hole 14 with a small gap.
The cover 7 is slidably mounted (moved up and down) in the middle of the nozzle 2, and is formed in a box shape with one side open so that an end face 7 a thereof comes into contact with the surface of the workpiece 5 during a cutting operation.

In the above configuration, when cutting the object 5, first, the cover 7 is slid to an appropriate position so that the end face 7 a is brought into contact with the surface of the object 5, By applying a predetermined voltage between the nozzle 2 and the electrode 3 and supplying the working gas 15 to the outlet hole 14, a plasma jet is generated from the outlet hole 14, whereby the object 5 is cut. .

At this time, although the exhaust gas 6 is generated, the exhaust gas 6 is prevented from being scattered by the cover 7, and the exhaust gas 6 is transferred to the suction pipe 8 by the drive of the suction pump 10 and is processed by the exhaust gas treatment device 9. Is discharged to a predetermined place.

The cover 7 can also prevent scattering of cutting powder generated at the time of cutting. As described above, according to the first embodiment of the present invention, when cutting the workpiece 5,
Since the cover 7 is provided to prevent the cutting powder from being scattered, it is possible to prevent the worker from sucking these pieces during the cutting operation, which is safe.

Next, a second embodiment of the present invention will be described with reference to FIG. In the plasma cutting device 1 according to the second embodiment of the present invention, a caster 20 is attached to an end face 7a of a cover 7. Other configurations are the same as those of the first embodiment.

According to this configuration, when the workpiece 5 is cut, the nozzle 2 is freely moved along the surface of the workpiece 5 by causing the casters 20 to contact the surface of the workpiece 5. Can be done. Other functions and effects are the same as those of the first embodiment.

Next, a third embodiment of the present invention will be described with reference to the sectional view of FIG. The plasma cutting device 1 according to the third embodiment of the present invention includes:
A contact member 30 made of an elastic material such as urethane is provided.

According to this configuration, when the contact member 30 is brought into contact with the surface of the object 5 when the object 5 is cut, the contact member 30 is made of an elastic material. Therefore, the exhaust gas 6 can be reliably prevented from scattering. Other functions and effects are the same as those of the first embodiment.

[0020]

As is apparent from the above description, according to the present invention, a cover for preventing scattering of exhaust gas generated at the time of cutting an object to be cut is provided on a metal nozzle, and this cover sucks exhaust gas. Since a suction pipe for guiding to a predetermined place is attached, a predetermined voltage is applied between the nozzle and an electrode provided so as to face the outflow hole provided in the nozzle, and the working gas is supplied to the outflow hole. When a plasma jet is generated from the outflow hole to cut an object to be cut, scattering of exhaust gas can be prevented, which is safe for an operator.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an overall configuration of a plasma cutting apparatus according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating an overall configuration of a plasma cutting apparatus according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating an overall configuration of a plasma cutting device according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a conventional plasma cutting apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plasma cutting device 2 Nozzle 3 Electrode 4 Power supply part 5 Object to be cut 6 Exhaust gas 7 Cover 8 Suction pipe 9 Exhaust gas treatment device 10 Suction pump

Continuation of the front page (72) Inventor Hidehiko Maehata 5-3-28 Nishikujo, Konohana-ku, Osaka, Osaka Inside Hitachi Zosen Corporation (72) Inventor Tsuyoshi Kato 5-28, Nishikujo, Konohana-ku, Osaka-shi, Osaka No. Within Hitachi Zosen Corporation

Claims (2)

[Claims] 1. A nozzle made of metal and an electrode provided in the nozzle so as to face an outflow hole provided at a tip of the nozzle, and a predetermined voltage is applied between the nozzle and the electrode to flow out a working gas. A plasma cutting device that generates a plasma jet from an outflow hole by feeding into a hole and thereby cuts an object to be cut, wherein a cover is provided on a nozzle to prevent scattering of exhaust gas generated when cutting the object to be cut. And a suction pipe for sucking exhaust gas and guiding the exhaust gas to a predetermined location is attached to the cover. 2. The plasma cutting apparatus according to claim 1, wherein a wheel that rolls in contact with the surface of the object to be cut is attached to the cover.