JPH10180449A - Plasma cutting torch - Google Patents

Abstract

(57) [Problem] To provide a plasma cutting torch which is easy to assemble, reduces the number of screw fixing points, shortens the number of assembling steps, and does not allow a detection wire to enter a joint. A metal center member having a bent distal end portion,
A torch body 21 provided with an inverted T-shaped projection 24 below the bent portion of the insulating covering member on the outer periphery of the metal center member.
An insulating cylinder 25 provided with a flange 26 on the upper part; a projection 28 located on the upper side of the inverted T-shaped projection 24 of the torch body 21 on the front part to protect the lower part of the torch body 21; Body cover 27 provided with a depression 29 for supporting the torch body, and a gripper 30 provided with a depression 29 for holding each end of the torch body 21 and the torch body cover 27 and pressing the end of the root of the torch body cover 27 at the front. With plasma cutting torch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma cutting torch using a working gas, and more particularly to a long type plasma cutting torch having a long torch body extending from a gripping portion.

[0002]

2. Description of the Related Art A conventional plasma cutting torch is shown in FIG.
A description will be given along (c).

[0003] A torch body 1 includes a metal center member 2 having a working gas passage therein and a tip portion bent from a root portion through a bent portion, and an insulating covering member 3 surrounding the metal center member 2. Is a tip made of copper or a copper alloy which is attached to the tip of the torch body 1 and squeezes a plasma arc with a working gas and supplies the workpiece to a base material (work); Is detected on the detection line 6 when the shield cup 5 is detached from the torch body 1. Reference numeral 7 denotes an insulating cylinder that protects the tip of the torch body 1 and is provided with a flange 8 on the upper part. Reference numeral 9 denotes a pair of left and right grips that hold the torch body 1 and the insulating cylinder 7, and are screwed. Reference numeral 10 denotes a power cable for supplying a cutting current and a working gas to the torch body 1. Reference numeral 11 denotes a fitting recess formed at the tip of the grip 9 for holding the flange 8 of the insulating tube 7, and 12 fixes the grip 9 and the root of the torch body 1 at the center of the grip 9 with screws and nuts. First for
Screw holes 13 are second screw holes for fixing the grip 9 held by the worker so as not to open. In the conventional plasma cutting torch, the detection wire 6 is arranged in the space between the torch body 1 and the pair of gripping parts 9 so as not to be caught by the joint surface 14. Since the detection signal cannot be sent from the detection line 6 when it comes off, the separation is detected to prepare for danger prevention.

[0004]

However, in the above-mentioned conventional plasma cutting torch, the grip portion 9 is very long because the root portion is a long type, and both the torch body 1 and the insulating cylinder 7 are held by the grip portion 9. Since they are fixed at the same time, there is a problem that it is difficult to assemble.

In addition, there are three first screw holes 12 for screwing, and four second screw holes 13, that is, a total of seven holes, and there is a problem that it takes a long time to assemble.

Further, when assembling the left and right grips 9, the detection line 8 enters the joint 14 on the lower surface of the left and right grips 9,
There is also a problem that a gap is formed in the joint portion 14 and foreign matter enters the handle 9 from the gap, and in the worst case, the detection line 8 that has entered the joint portion 14 is cut off and a detection signal cannot be sent.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a plasma cutting torch which has good assemblability and does not allow a detection wire to enter a joint.

[0008]

In order to achieve the above object, a plasma cutting torch of the present invention has a working gas passage therein and a metal tip having a bent end portion from a root portion through a bent portion. A torch body formed of a center member and an insulating covering member surrounding the metal center member, and having an inverted T-shaped projection provided along the tip on the inner corner side of the bent portion;
An insulating cylinder inserted into the outer periphery of the tip of the torch body and provided with a flange on the upper part, and a protruding part formed at the lower part of the root part of the torch body, and a detection line is arranged in the left and right space of this protruding part. Holding a torch body cover in which a recess is provided inside a space between the protrusion engaging with the upper part of the inverted T-shaped protrusion of the torch body and a root portion, and each end of the torch body and the torch body cover; The torch body cover is provided with a holding portion having a recess for locking an end portion thereof.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS With this configuration, the gripping portion becomes a short part, and when the torch body cover is fitted into the torch body, these ends are fixed at the front portion of the gripping portion, so that assembly is easy. Become.

Further, the torch body and the torch body cover can be fixed by a projection provided below the bent portion of the torch body and a projection at the front of the torch body cover located above the projection. The flange of the upper part of the insulating cylinder can be inserted into the recess at the front of the torch body cover. The number of screwing points is reduced, and the assembling time can be shortened.

Further, since the detection line is incorporated into two steps, a first assembling step of the root portion of the torch body and the torch body cover and a second assembling step of the pair of gripping portions.
The detection line does not enter the joint.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to (a) to (c). FIG.
In FIGS. 2A to 2C, reference numerals 4, 5, 6, and 10 are the same as those in FIGS.

Reference numeral 21 denotes a metal center member 2 having a working gas passage therein and having a bent end from a root through a bent portion.
2, a torch body having an inverted T-shaped projection 24 formed on the inner corner side of the bent portion from the root portion to the tip portion, and 25 is a torch body. An insulating tube 27 that protects the tip of the torch 21 and has a flange 26 on the top, a protection 27 that protects the lower part of the torch body 21 on the root side, and a projection 28 that engages above the T-shaped projection 24 of the torch body 21 at the front. And a torch body cover provided with a depression 29 for supporting the flange 26 of the insulating cylinder 25, and a torch body 30 for holding the torch body 21 and the insulating cylinder 25, and a depression 31 for holding the end of the root of the torch body cover 27 at the front. It is a pair of holding parts.

Next, the fixing structure of the plasma cutting torch according to the present embodiment will be described. The torch body 21 and the torch body cover 27 are fixed by engaging the protrusion 28 at the front of the torch body cover 27 with the upper side of the inverted T-shaped protrusion 24 below the bent portion of the torch body 21. The insulation tube 25 and the torch body cover 27 can be fixed in the vertical direction. The upper flange 26 of the insulation tube 25 can be fixed to the front recess 29 of the torch body cover 27.
By fixing the torch body cover 27 to the torch body cover 27 in the forward direction, the root portion of the torch body cover 27 is fixed to the recess 31 at the front of the grip portion 30. By fitting, the torch body cover 27 can be fixed vertically and rearward. The sectional shape of the root of the torch body 21 is shown in FIG.
(B) In addition to those shown in (c), the end of the root is formed in a square shape (not shown) in order to prevent the grip portion 30 from coming off. Further, the torch body 21 can be fixed to the grip 30 by screwing the left and right grips 30.

As described above, according to the present embodiment, the grip portion 30 is shortened, and the ends of these root portions are placed in front of the grip portion 30 with the torch body cover 27 fitted in the torch body 21. It is easy to assemble because it may be fixed at the part.

In addition, since all the parts can be fixed with one touch except for the four places where the holding part 30 is screwed, the number of screwing places is reduced and the assembling time can be shortened.

Further, the detection wire is incorporated into the torch body 2.
1 and the first assembling step of the torch body cover 27 and the second assembling step of the left and right grips 30, so that the detection line 8 does not enter the joint.

[0018]

As described above, according to the present invention, the grips are shortened, and the ends of these roots are fixed at the front of the grips with the torch body cover fitted in the torch body. It is easy to assemble, and all parts can be fixed with one touch except for the screwing of the gripping part, so that the screwing location can reduce the assembling time, and the first of the torch body and the torch body cover Since the assembling process and the second assembling process of the pair of gripping portions are performed in two processes, an excellent effect is obtained such that the detection line does not enter the joining portion.

[Brief description of the drawings]

1A is a side sectional view of a plasma cutting torch according to an embodiment of the present invention. FIG. 1B is a sectional view taken along line AA of FIG. 1A. FIG. 1C is a sectional view taken along line BB of FIG. Figure

2A is a side sectional view of a conventional plasma cutting torch. FIG. 2B is a sectional view taken along line AA of FIG. 2A. FIG. 2C is a sectional view taken along line BB of FIG. 2B.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Torch body 22 Metal center member 23 Insulation coating member 24 Inverted T-shaped projection 25 Insulation cylinder 26 Flange 27 Torch body cover 28 Projection 29 Depression 30 Gripping part 31 Depression

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Satoshi Saito 1006 Kazuma Kadoma, Kadoma, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A metal center member having a working gas passage therein and having a bent end from a root portion via a bent portion, and an insulating covering member surrounding the metal center member,
A torch body provided with an inverted T-shaped projection extending from the root to the tip on the inner corner side of the bent portion, an insulating cylinder inserted into the outer periphery of the tip of the torch body and provided with a flange on the top, A protrusion is formed at the lower part of the root of the body, a detection line is disposed in the left and right space of the protrusion, and a protrusion and a root that engage with the upper side of the inverted T-shaped protrusion of the torch body are formed. A torch body cover that holds the detection line in a space between the two and provides a recess for supporting the flange of the insulating cylinder inside.
A plasma cutting torch, comprising: a holding portion that holds each end of the torch body and the torch body cover and has a recess that locks an end of the torch body cover.