KR20130077891A - Heavy cutting nozzle for cutting steel workpieces in particular - Google Patents

Abstract

The heavy cutting nozzle 1 for cutting steel workpiece 200 and ferroalloy workpieces, in particular flat plates, ingots and billets, has a nozzle body 2 having threads 4 for fixing the cutting torch 100. have. The heavy cutting nozzle 1 also has a centrally arranged cutting oxygen channel 5, a plurality of heating gas channels 10 concentrically arranged in a particular inner pitch circle 10.1 and concentric circles in the center pitch circle 11. 1. It consists of a plurality of heated oxygen channels 11 arranged. The outlet openings of the media channels 5, 10, 11 open into the space 7 surrounded by the nozzle body 2. The space 7 enclosed by the nozzle body 2 is polygonal, conical or nearly semicircular with respect to its outlet endpoint from the outlet opening of the media channels 5, 10, 11 for cutting oxygen, heating oxygen and heating gas. In which the outflowing media is diverted towards the center of the nozzle at an oblique or curved discharge surface (F) to the periphery at a distance (B) outside of the nozzle body (2) and away from the heavy cutting nozzle (1). It has a swirling effect with the air.

Description

HEAVY CUTTING NOZZLE FOR CUTTING STEEL WORKPIECES IN PARTICULAR}

FIELD OF THE INVENTION The present invention relates to heavy cutting nozzles for cutting steel and iron alloy workpieces, in particular flat plates, ingots and billet workpieces, comprising: threads for fastening to the nozzle body and cutting torch, centrally arranged cutting oxygen channels, specific inside It consists of a plurality of heating gas channels arranged concentrically on the pitch circle, and further a plurality of heating oxygen channels arranged concentrically on the center pitch circle, wherein the outlet opening of the media channel opens into a free space surrounded by the nozzle body.

Oxygen gas cutting torches are designed for cutting steel and iron alloy workpieces. This device is used to efficiently cut flat plates, ingots and billets. Here, the sparking oxygen ignites the spark of the cutting gas torch and the cutting gas is directed toward the surface of the metal to be cut. As a result, the metal is heated to the ignition temperature, and the cutting oxygen oxidizes the metal so that the cutting operation can be performed. The workpiece then combusts and forms a joint which is stretched and cut as the stream progresses. Since heat is generated during the above process, this flame cutting process is called self-generated heat. That is, the next steel layers at the point of cutting are further heated in advance to the temperature obtained in the burning steel.

In principle, pre- or post-mix nozzles and / or torches should be distinguished. In the case of premix nozzles, the heating oxygen and heating gas are mixed in the torch head before flowing out for ignition. In the case of a post-mix cutting torch, the torch exits without mixing hot oxygen and hot gas. Turbulence causes the stream to mix before ignition.

So-called post-mix cutting nozzles for cutting torch devices are known from US 6,277,323 B1 and CA 2,109,772 C. In this system, the media heating oxygen, heating gas and cutting oxygen are mixed only in the area where the flame is released. The nozzle is fixed by a fixing nut surrounding the nozzle and connected to the cutting torch. This nozzle features axial drilling for cutting oxygen outflow of the cutting torch. In addition, the nozzle is arranged with a plurality of heating gas perforations in the inner concentric circle around the axial cut oxygen perforation. The nozzle also consists of a plurality of heated oxygen perforations arranged in an outer concentric circle around the axial cut oxygen perforation. Each perforation, ie axial cut oxygen perforation, heated gas perforation, and heated oxygen perforation opens from the outlet end to the outlet opening and moves into the cylindrical space within the fixing nut where the cutting spark is generated.

Thus, the nozzle is a nozzle that is mixed externally, also referred to as "post-mixing", ie, the nozzle in which the media mixture is outside of the nozzle and not outside. In addition, the nozzle is designed in several parts by additional retaining nuts, which makes the nozzle design expensive and complex. In addition, the cutting joint is formed relatively large. In addition, contaminants such as ash, dust and dust particles may accumulate in the outflow area of the flame in the cylindrical space in the fixing nut, and these may penetrate inside the nozzle and shorten the service life of the cutting nozzle.

The object of the present invention is to produce a heavy-cutting nozzle of the kind mentioned above, which produces less steel / ash particles during operation, produces smaller, smoother cut joints at low noise levels, and increases nozzle life. It is.

According to the present invention, the problem is solved by designing the space enclosed in the nozzle body to face the outlet endpoint in a polygonal, conical or near semicircle form from the outlet opening of the media channel for cutting oxygen, heating oxygen and heating gas. . This allows the outflowing media to deflect at the center of the nozzle from the inclined or bent outlet surface and to swirl with ambient air outside the nozzle body away from the heavy cutting nozzle.

Compared with conventional cutting nozzles, it is possible to preheat the workpiece to be cut and to request the media geometry arranged in the nozzle body of the heavy cutting nozzle, the special geometric design of the media channel for gas and oxygen supply, and the self-generated flame cutting. The material is cut at a greater distance between the heavy cutting nozzle and the workpiece surface by achieving heating and flame cutting temperatures. In addition, cutting with this heavy cutting nozzle produces less steel / grain particles on the workpiece surface and the heavy cutting nozzle. The cutting joints are smaller and smoother, with less noise. In addition, the service life of the heavy cutting nozzle can be significantly long.

In this nozzle design, the mixing of heating gas and heating oxygen and the highest possible combustion temperature in connection with it, and the protection of the stream consisting of the air / oxygen mixture exiting through the outer protective jacket, ensure that between the heavy cutting nozzle and the workpiece surface At a greater distance.

The subclaims further explain the features and advantages of the structure.

According to this, the outflow surfaces of the media channel are inside the nozzle body and can be joined together as needed. The result is a polygonal, conical, or semicircular or even cylindrical space exiting the media for media outflow of cutting oxygen, heating oxygen and heating gas.

In the supersonic flow range, the exiting gas is directed towards the center in the inclined and / or bent outflow surface area to effect the swirling farther away from the medium cutting nozzle seen by the media.

Heavy cutting nozzles are further developed in accordance with the present invention, where a plurality of oxygen channels pass through the nozzle body and into the annular groove at the outlet end of the nozzle body for additional escape of oxygen to the pipe-shaped protective oxygen wall and / or protection. Form a jacket. The jacket protects the spill surface from contamination by dust particles generated during flame cutting. These particles are blown off the oxygen protective jacket which is drawn out by the outflow surface of the nozzle. In this way, the protective jacket prevents dust particles from sticking to the end of the nozzle outlet by the cooling effect of oxygen. In addition, the air / oxygen mixture further escaping from the annular grooves forms a protective oxygen jacket around the cutting oxygen, the heating gas and the heating oxygen to prevent premature swirling in the margin area and to minimize the noise level generated.

In addition, the annular groove is designed to have a variable cross section, preferably semicircular or rectangular.

In addition, the oxygen channel may further be equipped with at least one rear mounted channel for intake of ambient air, which channel is led to each oxygen channel from outside of the nozzle body.

In addition, the space enclosed in the nozzle body is cylindrical from the outlet opening of the media channel toward its outlet endpoint, and the media channel opens in a rectangular shape into the outlet opening of the space enclosed in the nozzle body.

The basic concept of the invention is explained in more detail on the basis of the structures exemplified in the figures. Each drawing shows as follows.
1 is a heavy cutting nozzle according to the present invention, viewed from the media channel outlet opening according to FIG.
Figure 2 is a longitudinal cut surface of the heavy cutting nozzle taken along the line AA in Figure 1;
3 is a cross-sectional view of the heavy cutting nozzle taken along the line BB in FIG.
Figure 4 is a view of the heavy cutting nozzle according to Figure 5 seen from the "Y" side.
FIG. 5 is a cut plane of a heavy cutting nozzle taken along line CC in FIG. 4; FIG.
FIG. 6 is a cut plane of a heavy cutting nozzle taken along line DD in FIG. 4; FIG.
7 is a detail view of “X” according to FIG. 6 in a second structure;
8 is a detail view of “X” according to FIG. 6 in a third structure;

1 to 8, the heavy cutting nozzle 1 for cutting the workpiece 200 is equipped with a nozzle body 2 designed as a piece. A hexagon bolt 3 is attached to the nozzle body 2 along the circumference. Another part of the outer circumference of the nozzle body 2 is characterized by an external thread 4 for fixing it with a tool suitable for the cutting torch 100 shown schematically in FIG. 3.

1 shows the distribution of outlet channels for the media required for the cleavage procedure. In the center of the nozzle body 2 is an axial cut oxygen channel 5 which covers the area from the inlet side 6 to the space 7 above the outlet area 8 of the nozzle body as shown in FIG. 2. The space 7 is cylindrical in the form of a fan in consideration of the structure of the heavy cutting nozzle 1.

The axial perforation 5 is widened in a conical shape at the end toward the space 7. By doing so, the rate of the cutting oxygen flowing in the cutting oxygen channel 5 is increased, thus increasing the energy. At the end of this axial perforation 5 a cutting flame is formed.

In parallel with the cutting oxygen channel 5, a plurality of heating gas channels 10 are arranged concentrically in the inner pitch circle 10.1 in the nozzle body 2.

In addition, the nozzle body 2 has a plurality of heating oxygen channels 11 in the center pitch circle 11. 1 from the inlet end 6 of the heavy cutting nozzle 1 to the space 7 of the nozzle body 2. It is arranged alongside the oxygen channel 5.

In addition, the nozzle body 2 has an annular groove 12 surrounding the space 9 at the outlet end point, and an additional oxygen channel 13 connected from the center pitch source 11. 1 has a groove (from the inlet side 6). It is inclined toward 12).

The longitudinal cut plane A-A through the nozzle body 2, shown in FIG. 2 according to FIG. 1, represents the course of the cutting oxygen channel 5, the heating gas channel 10, and the heating oxygen channel 11. These media channels (5, 10 and 11) open into space 7.

The longitudinal cutting plane BB passing through the nozzle body 2, shown in FIG. 3 according to FIG. 1, contains a cutting oxygen channel 5, a heating oxygen channel 11 and an additional oxygen channel 13 having an annular groove 12. Towards). In addition, each case is equipped with another channel 14 for sucking in the surrounding air 15, opened in the assigned oxygen channel 13, and laid obliquely from the outside of the nozzle body 2 to this channel. have. Media channels 5, 11 exit the space 7 from the outflow surface 8. The additional oxygen supplied through the additional oxygen channel 13 exits in the annular groove 12 together with the surrounding air 15 captured by the suction effect of the channel 14 and surrounds the cutting flame to increase the efficiency of the flame. A pipe-shaped protective oxygen wall 16 is formed in the pipe. The mixing of the heating gas with the heating oxygen, reaching the highest possible combustion temperature “T” and the protection of the stream exiting through the protective jacket of the air / oxygen mixture are all heavy cutting nozzles (1) and workpiece material. Proceed at a greater distance “A” between surfaces 200.

FIG. 4 is a schematic view of FIG. 1 again to illustrate cross-sections C-C and D-D in FIGS. 5 and 6.

FIG. 5 shows the longitudinal cutting plane C-C passing through the nozzle body 2 together with the cutting oxygen channel 5, the heating gas channel 10, and the heating oxygen channel opening to the space 7. Using the structure 11, the heating gas and the heating oxygen media are obliquely passed through the space 7 and then mixed to swirl the nozzle body 2 at a distance “B” away from the heavy cutting nozzle 1. The enclosed space 7 is designed in the shape of a cone.

FIG. 6 shows a longitudinal section DD through the nozzle body 2 according to FIG. 4, for intake of ambient air 15 together with a heating oxygen channel 11, a cutting oxygen channel 5 and an additional oxygen channel. It spreads through the channel 14 and towards the annular groove 12. The media channels (5, 11) open into conical spaces (7). Additional oxygen in channels 13 and 14 exits into annular groove 12.

FIG. 7 shows a structure modified based on FIG. 6. The space (7), which is characterized by a narrower or more conical shape at the end, was changed so that a narrow or conical surface was characterized as a polygonal surface.

FIG. 8 details the X part of FIG. 7 in which the media outlets for the cutting oxygen and the heating oxygen are opened into the cavity 7 near the semicircle.

Of course, the features are not only used in the combination specified in each case, but may also be used in other combinations or alone without interfering with the framework of the present invention.

1: heavy cutting nozzle
2: nozzle body
3: hex bolt
4: external thread
5: cutting oxygen channel
6: inflow side
7: space
8: spill area
9: conical expansion
10: heating gas channel
10.1: Internal Pitch Circle
11: heating oxygen channel
11.1: Center Pitch Circle
12: home
13: oxygen channel
14: channel
15: ambient air
16: protection oxygen wall
100: cutting torch
200: processed material
A: distance
B: distance
T: combustion temperature

Claims (6)

As a heavy cutting nozzle 1 for cutting a steel workpiece 200 and an iron alloy workpiece, in particular a flat plate, an ingot and a billet, a thread 4 for fixing to a nozzle body 2, a cutting torch 100, Centrally aligned cutting oxygen channel 5, a plurality of heating gas channels 10 arranged concentrically on a particular inner pitch circle 10.1 and a plurality of heating oxygen channels 11 concentrically arranged on a center pitch circle 11. 1. In the heavy cutting nozzle (1), which is composed of
The space 7 surrounded by the nozzle body 2 is formed in a polygonal, conical or almost semicircular shape from the outlet openings of the media channels 5, 10, 11 for cutting oxygen, heating oxygen and heating gas, The outflowing media is thus diverted towards the center of the nozzle at an oblique or curved discharge surface (F) and vortexed with ambient air outside the nozzle body (2) and at a distance (B) away from the heavy cutting nozzle (1). Characterized by producing a striking effect Heavy cutting nozzle. The method of claim 1,
Heavy cutting nozzle, characterized in that the discharge surface (F) of the media channel (5, 10, 11) is inside the nozzle body (2) and can be combined with one another as necessary. The method of claim 1,
A plurality of oxygen channels 13 additionally pass through the nozzle body 2 and open into the annular groove 12 at the outlet end of the nozzle body 2 to further escape the oxygen-pipe protective oxygen wall. A heavy cutting nozzle, characterized by forming (16). The method of claim 3,
Heavy cutting nozzle, characterized in that the annular groove (12) is characterized by a variable cross section, preferably semi-circular or rectangular cross section. The method of claim 3,
The oxygen channel 13 is equipped with at least one additional rear mounted channel 14 for the intake of ambient air 12, the additional channel 14 being connected to each oxygen channel from the outside of the nozzle body 2. 13) a heavy cutting nozzle characterized by passing through. The method of claim 1,
The space 7 enclosed in the nozzle body 2 is cylindrical from the outlet opening of the media channels 5, 10, 11 toward its outlet endpoint and the media channels 5, 10, 11 are nozzle body ( Characterized in that it opens in a rectangular shape on the outflow surface of the space 7 enclosed in 2). Heavy cutting nozzle.

Images