JPH07136767A - Plasma torch and hood - Google Patents

Abstract

PURPOSE:To improve the working environment of the plasma working site by shutting off car absorbing the noise to be generated in association with the injection of the plasma arc. CONSTITUTION:A body 4 of a hood B is constituted by forming a hole 5 where a plasma torch is inserted approximately in the center of a mounting part 4a, and forming a wall part 4b therearound in a suspended manner. The generated noise is absorbed by consisting the body 4 of the glass wool, the rock wool or the like. The temperature rise in the space D is prevented by forming the space D to be formed inside the hood B and a through hole 10 to be communicated with the atmosphere, and in addition, dusts to be generated in realizing the plasma working is treated by connecting the through hole 10 to a sucking device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma torch in which noise generated during processing is reduced, and a hood attached to the plasma torch for shielding or absorbing noise.

[0002]

2. Description of the Related Art Plasma processing is performed by injecting a high-temperature, high-speed plasma arc toward a material to be processed from a nozzle formed at the tip of a plasma torch. That is, when the workpiece is melted by the plasma arc and the molten product is eliminated at the same time, the cutting process is performed, and when the molten product is re-solidified, the welding process is performed. If mixed, it will be a thermal spraying process.

[0003]

In plasma processing, since a plasma arc is jetted at high speed from a nozzle having an extremely small diameter, noise is inevitably generated, which deteriorates the working environment for the operator of the processing apparatus and general workers. There is a problem of doing.

It is an object of the present invention to provide a plasma torch capable of improving the working environment of a plasma processing site, and a hood for shielding or absorbing noise generated by injection of a plasma arc. .

[0005]

In order to solve the above-mentioned problems, a plasma torch according to the present invention is constructed by attaching a hood at a tip portion thereof which shields or absorbs noise generated by performing plasma processing. Is.

A typical hood according to the present invention is a hood that is mounted on a plasma torch and shields or absorbs noise generated by the execution of plasma processing. It has a mounting part formed with a hole corresponding to and a wall part hanging down around the mounting part.

[0007]

In the plasma torch described above, the noise generated by the jetting of the plasma arc during the plasma processing can be shielded or absorbed by the hood. Therefore, the working environment at the plasma processing site can be improved.

In the above hood, the plasma torch can be mounted through the hole formed at the substantially center of the mounting portion, and the wall portion is hung down around the mounting portion. The arranged nozzle member can be covered like an umbrella by the mounting portion and the wall portion. For this reason, the hood can shield or absorb the noise generated by the ejection of the plasma arc from the nozzle.

[0009]

EXAMPLES An example of the plasma torch and hood will be described below with reference to the drawings. FIG. 1 is a diagram for explaining the configuration of a plasma torch equipped with a hood, and FIG. 2 is a sectional view of the hood.

In the plasma torch A shown in FIG. 1, an electrode (not shown) is arranged at the tip of the torch body 1, and a cap 2 having a nozzle member inserted therein is detachably attached.
By injecting a plasma arc from a nozzle arranged on the cap 2 toward a material to be processed, cutting, welding, thermal spraying, or other processing is performed. As the plasma torch A, a known plasma torch can be used.

A hood B constructed as shown in FIG. 2 is mounted on the tip side of the torch body 1 so as to be movable in the axial direction of the body 1. A hood holder 3 holding a hood B is fixed to the tip of the torch body 1.

Therefore, the hood B mounted on the torch body 1 so as to be movable in the axial direction is regulated by the hood holder 3 in the position in the front end direction. Therefore, food B
Does not fall off the torch body 1, and the hood B
It is possible to maintain the gap between the workpiece C and the workpiece C at a preset value. Further, by moving the hood B to the upper side of the torch body 1, it is possible to attach and detach the cap 2.

Next, the structure of the hood B will be specifically described. The hood B has a hood main body 4 including a mounting portion 4a and a wall portion 4b formed so as to hang down around the mounting portion 4a. Therefore, the main body 4 of the hood B is formed to have an umbrella shape. A hole 5 having a diameter substantially equal to the outer diameter of the torch body 1 of the plasma torch A to be mounted is formed in the center of the mounting portion 4a, and the torch body 1 is mounted through this hole 5.

When the hood B is to exert only the sound insulation effect, the body 4 can be made of a steel plate or a stainless steel plate. Further, when only the sound absorbing effect is generated in the hood B, the main body 4 can be configured by using a material having heat resistance, flame retardancy and sound absorbing properties, such as glass wool or rock wool. Further, when the sound insulation effect and the sound absorption effect are exerted on the hood B, the outer shape of the main body 4 is formed by a steel plate or a stainless steel plate, and the inner shape is formed by punching metal or the like. It can be filled with wool. Further, the sound absorbing effect can be improved by appropriately setting the density of glass wool or rock wool.

In this embodiment, a sound absorbing body 6 formed of compressed rock wool is covered with a heat resistant cloth 7 to form a main body 4.
Are configured. Also, the torch body 1 in the mounting portion 4a
A plate-shaped sound absorbing body 8 formed in a plate shape with a density higher than that of the sound absorbing body 6 forming the main body 4 is arranged on the surface on the tip side of the.

The wall 4b of the hood B is made of a material C to be processed.
It is preferable to have a length that allows the surface to be in close contact. However, when the wall portion 4b made of a metal plate or a sound absorber is brought into close contact with the surface of the work material C, the wall portion 4b collides with the cut product or the surface of the work material C in which thermal distortion has occurred. It becomes difficult to continue the processing, and there is a possibility that the processing cannot be performed in extreme cases.

Therefore, a thin plate-shaped sound insulation wall 9 is formed continuously with the wall portion 4b. As a material forming the sound insulation wall 9, it is possible to use a material having heat resistance and flame resistance, such as a thin steel plate, a thin stainless steel plate, or a thin plate made of a synthetic resin having flame resistance.

In this embodiment, a transparent synthetic resin plate (having a thickness of about 1 mm) is used so that the state of the plasma arc sprayed from the cap 2 of the plasma torch A and the state of the work piece C can be easily observed. Is used to form the sound insulation wall 9. In the sound insulating wall 9 made of such a synthetic resin plate, even if the sound insulating wall 9 collides with the work material C or the product, the synthetic resin plate has appropriate flexibility, so that the sound insulating wall 9 may be damaged or cause a problem in processing. Absent. As a synthetic resin plate that can be used in the vicinity of the plasma arc, there is a molded product obtained by mixing a material having flame retardancy with vinyl chloride. Particularly, when the sound insulation wall 9 is formed of a colored and transparent synthetic resin plate, it is advantageous because it is possible to protect the eyes from the light of the plasma arc when observing the processing state.

As described above, when the plasma processing is carried out by mounting the hood B having the sound insulating wall formed on the wall portion 4b of the main body 4 on the plasma torch A, the space D formed by the workpiece C and the hood B is the plasma. There is a risk that the temperature will rapidly rise due to the influence of the arc and the hood B and the plasma torch A will be adversely affected.

Therefore, the through hole 10 is formed in the mounting portion 4a or the wall portion 4b of the main body 4 to communicate the space D with the atmosphere.
By forming the through hole 10 in the main body 4 in this way, the temperature-elevated air in the space D is released to the atmosphere through the through hole 10 and is formed in the space D between the sound insulation wall 9 and the workpiece C. It is possible to prevent the extreme temperature rise of the space D by inflowing new air through a slight gap.

When the through hole 10 is formed in the body 4, the through hole 10
Sound leaks from. Therefore, by appropriately setting the diameter and the number of the through holes 10, it is possible to prevent sound leakage as much as possible. That is, in this embodiment, four through holes each having a diameter of 10 mm are formed, and the pipe 11 made of punching metal is inserted into each of the through holes 10 so that the sound absorber 6 absorbs the sound leaking through the through holes 10. Is absorbed by.

Further, in this embodiment, a threaded portion 11a is formed at the end of the pipe 11 on the atmosphere side, a hose (not shown) is attached to the threaded portion 11a, and the other end of the hose is sucked by a blower or the like. The air in the space D can be forcibly discharged by connecting to the device. in this way,
By connecting the space D consisting of the hood B and the sound insulation wall 9 to the suction device, it is possible to process the dust generated by plasma processing without releasing it to the atmosphere, and prevent the temperature rise of the space D. It is possible to prevent sound leakage.

[0023]

As described in detail above, in the plasma torch according to the present invention, the hood shields noise generated when the workpiece is cut, welded, sprayed or the like. Can be absorbed,
It is possible to reduce noise and improve the working environment.

Further, in the hood according to the present invention, the generated noise can be shielded or absorbed by covering the tip of the plasma torch like an umbrella, and further, the space formed by the hood and the suction device are separated. If connected,
It has a feature that dust and the like generated by plasma processing can be processed without radiating to the atmosphere.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a configuration of a plasma torch equipped with a hood.

FIG. 2 is a sectional view of a hood.

[Explanation of symbols]

A Plasma torch B Hood C Work material D Space 1 Torch body 2 Cap 3 Hood holder 4 Body 4a Mounting part 4b Wall part 5 hole 6 Sound absorber 7 Heat resistant cloth 8 Plate-shaped sound absorber 9 Sound insulation wall 10 Through hole 11 Pipe 11a Screw part

Claims (6)

[Claims] 1. A plasma torch, wherein a hood that shields or absorbs noise generated by performing plasma processing is attached to a tip portion. 2. A hood that is mounted on a plasma torch and shields or absorbs noise generated during the execution of plasma processing, and has a hole corresponding to the outer diameter of the plasma torch to be mounted at a substantially central portion. And a wall portion formed so as to hang down around the mounting portion. 3. The hood according to claim 2, wherein the mounting portion and the wall portion are made of a sound absorbing material. 4. The hood according to claim 2, wherein the mounting portion or the wall portion is provided with a through hole that opens into a space formed inside the mounting portion and the wall portion. 5. The hood according to claim 4, wherein a connecting portion for connecting a tubular member is formed at an end of the through hole that is open to the atmosphere. 6. The hood according to claim 2, wherein a thin plate-like sound insulation wall is formed so as to be continuous with the wall portion.