JP3369116B2 - Powder cutting equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder cutting device for supplying iron powder or the like to a cutting part and utilizing the oxidation heat and the flux action thereof to cut a metal material into a gas.

[0002]

2. Description of the Related Art Powder cutting is a gas cutting method applied to cast iron, high alloy steel, non-ferrous metal, concrete, etc., and powder such as iron powder or flux (carbonate) powder is automatically and continuously produced. The gas is cut by supplying it to the cutting section. Therefore, it has been used for cutting materials that are difficult or impossible to cut by ordinary gas cutting.

A conventional powder cutting method is shown in FIGS. 4 and 5. In the example of FIG. 4, a cutting oxygen hole 33 is provided in the central portion of the crater, a heating flame hole 34 for ejecting a heating flame by mixing fuel gas and oxygen is provided on the outer side thereof, and a carrier such as nitrogen or dry air is further provided on the outer side thereof. The crater 32 has a structure having a powder ejection hole 35 which is fed by gas. The heating flame, the cutting oxygen flow and the powder 37 are ejected from each of the holes with the crater 32 facing the material 31 to be cut. Then, the flame 36 was made and the cutting work was performed. Further, in the example of FIG. 5, the powder feeding nozzle 35 is arranged independently of the crater 32, and the nozzle 35
Thus, the powder 37 is supplied from the outside of the flame.

However, in any of the above conventional methods, since the powder is supplied from the outside of the flame, the powder is easily scattered and the amount of the powder that does not contribute to the cutting is large and the combustion ratio is low. There was a problem that cutting efficiency was lowered. A means for supplying powder by previously mixing it into the heating flame hole or the cutting oxygen hole is also conceivable, but this method has not been adopted from the viewpoint of safety since it involves a risk of explosion or the like.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of conventional powder cutting, and it is possible to ensure a highly safe operation and increase the powder combustion ratio. The problem is to increase the combustion efficiency and thus the cutting efficiency.

[0006]

In order to solve this problem, a powder cutting device according to claim 1 of the present invention is a powder supply pipe having a tip portion reduced to fit the inner diameter of the crater,
It is placed through the center of the blower tube and the crater attached to its tip, and as it moves from the center to the radial direction at the tip of the crater, a powder ejection hole, cutting oxygen hole, curtain oxygen hole, heating
It is characterized in that flame holes and auxiliary combustion oxygen holes are sequentially arranged, and the powder is heated and melted from the surroundings by a heating flame and an oxygen jet flow to increase the combustion ratio of the powder and improve the cutting efficiency.

According to a second aspect of the present invention, the above device is provided.
In the above, the powder supply pipe is provided above the blow pipe.
Close to the pipe joint at any point like a collet chuck
It is held and fixed, and the centering member is placed on the outer surface inside the crater.
The pipe is located at the center of the crater .
This ensures that the tip of the powder supply pipe is always at the crater tip.
It is fixed at the position that matches the end face.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the overall outline of the present cutting apparatus. Reference numeral 1 is a cutting blower tube, and 2 is a crater attached to the tip of the blower tube 1. However, in order to avoid complexity, the cross section of the crater has a powder ejection hole 16 and a cutting tip. The parts other than the oxygen holes 17 are omitted. 3 is a crater stop nut for fixing the crater 2 to the blow tube 1, 4 is a powder and cutting oxygen pipe which is inserted through the center from the rear surface of the blow tube 1, and 5 and 6 are also from the rear end surface of the blow tube 1 to the inside thereof. Is a fuel pipe and a heating oxygen pipe, which have connecting portions 5a and 6a for connection with a supply hose at their ends. 7 is these pipe 4, pipe 5
6 is a plate for fixing 6 and 6.

Further, 8 is a powder supply pipe which penetrates through the powder and the cutting oxygen pipe 4 and whose tip extends to the tip surface of the crater 2, and 9 is the powder and the cutting oxygen pipe 4. A pipe joint that is attached to the ends via stop nuts 11 and 12, a pipe 10 for cutting oxygen is connected to the side of the pipe joint 9, and above the upper stop nut 11 of the pipe joint 9. Means for holding the powder supply pipe 8 which longitudinally cuts the pipe joint 9 at an arbitrary position is provided. That is, as shown in FIG. 3, the fixed nut 13 screwed into the lock nut 11 is formed with a slit portion 13 a, and a nut 14 with a taper screw is screwed into the slit portion 13 a, and the nut 14 is rotated to rotate the slit portion 13 a. Is narrowed and the powder supply pipe 8 is gripped and fixed by the collet chuck method. Therefore, the pipe may be held and fixed by the collet chuck method at the position where the tip of the powder supply pipe 8 matches the tip surface of the crater. The portion of the powder supply pipe 8 to be inserted into the tip side of the crater 2 has a reduced diameter, and a core having a plurality of protrusions in the circumferential direction at an appropriate position in the middle thereof. The dashi member 8a is fixed and guides the pipe 8 so that it is always positioned at the center of the crater.

Next, FIG. 2 shows the details of the crater 2.
(A) is a partial cross-sectional view and (b) is a crater tip end surface view (view from XX arrow). One end side of the crater 2 has a tapered contact portion 15 to be inserted into the blow tube 1, a powder ejection hole 16 is formed at the center of the tip end surface of the crater on the other end side, and a cutting oxygen hole (circular hole) is formed around the powder ejection hole 16. ) 17, curtain oxygen hole (circular hole) 1 on the outside
8. Further, on the outer side thereof, a plurality of circumferentially arranged fuel gas holes 20 and heated oxygen holes 21 are sequentially provided with heating flame holes 19 for mixing at the tip of the crater to eject a heating flame. Furthermore, a plurality of auxiliary oxygen holes 22 for assisting combustion of the heating flame are formed on the outermost periphery of the tip surface of the crater.

The structure of the crater 2 includes a hollow crater body 25 and an insert 26 inserted into the crater body 25.
A tightening nut 27 for fixing the insert 26 to the main body, and an external crater 28 covering the outer circumference of the crater body 25.
And a powder supply pipe 8 which is inserted into the insert 26. Tinder body 25 and insert 26
A plurality of contact portions (intervening portions) 23, 24 provided at intervals in a ring shape are projectingly provided on the outer surface of the, and the gap between the crater body 25 and the insert body 26 and the external crater 28 is kept predetermined. . A fuel gas hole 20 is formed in the crater body 25, a heating oxygen hole 21 is provided between the outer surface of the crater body 25 and the outer surface of the outer crater 28, and a curtain oxygen hole 18 is provided between the inner surface of the crater body 25 and the outer surface of the insert 26. However, cutting oxygen holes 17 are formed between the inner surface of the insert 26 and the outer surface of the powder supply pipe 8.

Next, an actual cutting operation using the illustrated apparatus will be described. Oxygen placed upstream of the blowpipe 1,
Each valve provided in the supply path from the fuel gas and powder supply source (not shown) is opened to eject each from each ejection hole, and at the same time, ignites to form a heating flame and heat and melt the powder. And start powder cutting. In addition, as the ejection order, the ejection of powder or the ejection of cutting oxygen may be slightly delayed as compared with the others.

The fuel gas which becomes a heating flame passes from one pipe 5 at the rear of the blow tube 1 through a plurality of inflow ports 20a provided at the taper position of the crater 2 and the fuel gas holes 20, and the heating oxygen is supplied to the other side. A plurality of inflow ports 21a and heating oxygen holes 21 are passed from the pipe 6, and both are joined at the position of the hole 19 at the tip of the crater, and jetted as a heating flame.

The oxygen for cutting is supplied to the pipe 10 of the pipe joint 9.
Is discharged from the cutting oxygen hole 17 on the front end surface through the gap 4a between the powder supply pipe 8 in the pipe 4 and the opening 4b at the top of the crater 2 and the inside of the crater. At the same time, oxygen that has entered from the inflow port 4c of the taper portion is ejected as a curtain-shaped oxygen flow from the ejection hole 18 and exerts the function of strengthening the combustion of the heating flame from the inside. In addition, the inlet 21
A part of the heating oxygen supplied from a is ejected from the circumferentially arranged pores 22 located on the outer peripheral side of the crater 2 and contributes to the strengthening of the heating flame from the outside.

The powder is preliminarily conveyed from the powder supply pipe 8 by using nitrogen, air, or the like, is urged by the portion reduced in the crater, and is discharged from the ejection hole 16 at the tip of the pipe. As a result, the powder discharged from the central part of the crater is surrounded by the heating flame around it and the flame due to the jetted oxygen flow, and is sufficiently heated and melted and jetted to the material to be cut. Most powder is burned without being scattered and lost. Therefore, the combustion ratio of the powder is increased, the combustion efficiency is increased, and the cutting efficiency is also improved.

The crater 2 in the illustrated cutting device
Has ejection holes 18 and 22 for ejecting curtain oxygen and supporting oxygen for the purpose of enhancing the combustion of the heating flame.
According to such a crater structure, extremely thick (50 to 1000 mm
It is possible to perform gas cutting in a suitable state even for a material having a plate thickness of about 3), but for a plate having a plate thickness of 3 to 50 mm which is usually used for powder cutting,
It is sufficient to omit the curtain oxygen hole and the outer supporting oxygen hole.

Further, after closing the oxygen inflow port 4c provided in the taper portion of the crater, the supply positions of the cutting oxygen and the powder are reversed, and the cutting oxygen is discharged from the central ejection hole 16 and the powder is discharged from the holes 17 around it. It is possible to cut the powder even by ejecting the powder. In this case, the curtain oxygen is not blown out, but the powder is supplied in a ring shape and surrounded by the heating flame, so that the combustion efficiency is improved and it is suitable for cutting a relatively thin material.

[0018]

According to the powder cutting device of the present invention described above, since the powder is injected from the central position of the flame, most of the powder contributes to combustion and cutting, and the combustion efficiency of the powder is high. The condition of the cut surface is good,
Moreover, in terms of cutting thickness and cutting speed, it is 20% to 4% as compared with the conventional method of ejecting powder from the outside of the flame.
It was confirmed to improve by about 0%.

[Brief description of drawings]

FIG. 1 is an overall explanatory view of a blow tube and a crater portion showing an embodiment of a powder cutting device according to the present invention.

FIG. 2 shows details of the crater part in FIG.
(A) is a partial sectional view of a crater, (b) is a XX arrow view of (a).

FIG. 3 is a perspective view showing a fixed nut having a slit portion used in FIG.

FIG. 4 is an explanatory diagram showing an example of a conventional powder cutting method.

FIG. 5 is an explanatory view showing another example of a conventional powder cutting method.

[Explanation of symbols]

1 Blow Pipe 2 Crater 3 Crater Stop Nut 4 Powder and Cutting Oxygen Pipe 5 Fuel Pipe 6 Oxygen Pipe for Heating 7 Plate 8 Powder Supply Pipe 9 Pipe Joint 10 Pipe for Cutting Oxygen 11, 12 Lock Nut 13 Fixed with Slotted Parts Nut 14 Tapered screw nut 15 Tapered contact portion 16 Powder ejection hole 17 Cutting oxygen hole 18 Curtain oxygen hole 19 Heating flame hole 20 Fuel gas hole 21 Heating oxygen hole 22 Supporting oxygen hole 23, 24 Contact part (intervening part) 25 Crater body 26 Insert 27 Tightening nut 28 External crater

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Claims (2)

(57) [Claims] 1. A powder supply pipe, the tip of which is reduced to match the inner diameter of the crater, is arranged so as to pass through the blower pipe and the central portion of the crater attached to the tip thereof, and the tip end surface extends radially from the center portion. As it migrates, powder blowout holes, cutting oxygen holes,
A curtain oxygen hole, a heating flame hole and an auxiliary combustion oxygen hole are sequentially arranged to heat the powder from the surroundings with a heating flame and an oxygen jet.
A powder cutting device characterized by melting and increasing the burning ratio of powder to improve cutting efficiency. 2. The powder supply pipe is provided above the blow pipe.
Close to the pipe joint at any point like a collet chuck
It is held and fixed, and the centering member is placed on the outer surface inside the crater.
And that the pipe is located in the center of the crater
The powder cutting device according to claim 1, which is characterized in that .