KR20050010350A - Rotary complex lance - Google Patents

Abstract

PURPOSE: To provide a rotary complex lance for cutting iron scrap in an electric furnace at low temperature, the lance that cuts iron scrap from the early stage of the operation when performing an iron scrap melting operation in the electric furnace and adjusts flame direction and flow of the lance during cutting and refining operations. CONSTITUTION: The rotary complex lance for cutting iron scrap in an electric furnace at low temperature comprises a rotary joint(4a) and a complex lance(3b), wherein a turn guide is formed on the outer circumference of the complex lance, the turn guide is connected to an operation part of a cylinder, a cooling water inlet(3f) and a cooling water outlet(3g) are installed on the side surface of head of the complex lance, a city gas supply pipe, an oxygen supply pipe, a cooling water inflow pipe and a cooling water outflow pipe are sequentially formed from the center of the complex lance, one city gas nozzle and two oxygen nozzles are formed on a front end of the complex lance, the rotary joint is connected to the complex lance through a shaft(4b), the shaft is embedded in the rotary joint, an inlet(5b) having small diameter is formed at one side of the rotary joint in such a way that an oxygen supply pipe(5d) is formed under the inlet, a body having large diameter is formed at the other side of the rotary joint, a socket(5a) of city gas inflow pipe is connected to the inlet of the rotary joint, an inner tube(5c) and the shaft are respectively inserted into the body of the rotary joint, snap rings(5g), springs(5h) and bearings(5e) for rotating the shaft are embedded between the body of the rotary joint and the shaft from one side, the bearings are fixed by the snap rings, two O-rings(5i) are inserted a portion where the rotary joint is contacted with the inner tube and a portion where the rotary joint is contacted with the shaft, the snap rings and the springs are installed at a shoulder part of the inner tube corresponding to a portion where the rotary joint is contacted with the inner tube so that the inner tube is closely adhered to the rotary joint, the inner tube installed at the rotary joint and the other end of the shaft are connected to the complex lance by cover nuts(5j) with a gasket(5k) being interposed therebetween, and an outer part of the shaft is supported by a bearing housing(5m).

Description

Rotary complex lance for electric furnace low temperature cutting

The present invention is charged to the rotary composite lance for electric furnace low temperature cutting which is essential for cutting work and refining molten steel during melting after charging the scrap metal in the electric furnace using the eccentric bottom tapping method. It is about.

In order to manufacture molten steel in electric furnace, iron is charged into electric furnace and melting is started from the top by heat source of arcing of electrode. When heat source is secured to some extent, oxygen and charcoal materials needed for melting and refining are exposed to two exposed holes. It is injected into the side of the furnace body by an integrated lance device.

In general, the method of using a conventional electric furnace oxygen and peat material input lance (Lance), as shown in Figure 1, after charging the scrap (1b) in the electric furnace (1a) the upper electrode rod (1c) and the lower When the electrode 1d is energized to start dissolution, the scrap around the upper electrode 1c dissolves and a pool begins to form.

At this time, in order to help the solubility of the scrap metal and to insert the briquette material early, cutting of the scrap metal scattered on the side of the deslaging door 1f should be performed using the oxygen lance 1e. .

However, since the conventional oxygen lance 1e only injects oxygen, the effect of scrap cutting cannot be obtained unless sufficient glue is formed by the arcing operation of the electrode in the electric furnace.

In addition, the conventional oxygen lance is a device for moving the nozzle hole of the lance to the desired position during the cutting operation of scrap metal, one hydraulic device (1g) is installed and the up and down operation by a plurality of cylinder (1h) Although the swing operation shown in Fig. 2 is performed, the turning operation of the lance is impossible, and thus, the angle of the flame cannot be freely adjusted, and thus it is not effectively used.

Due to the problem of the oxygen lance, the production time of the molten steel is prolonged and productivity is lowered.

An object of the present invention is to provide a rotary composite lance for low-temperature cutting capable of cutting work even if the heat source is not secured after charging the scrap metal into the electric furnace.

Rotary composite lance for electric furnace low temperature cutting of the present invention is composed of a rotary joint and a composite lance, the composite lance is formed with a turn guide on the outer periphery, the turn guide is connected to the operating portion of the cylinder and the head of the composite lance coolant inlet and The outlet is installed on the side, and the inner flow path of the composite lance is formed with a city gas supply pipe, an oxygen supply pipe, a coolant inlet pipe, and a coolant discharge pipe in the middle, and one city gas nozzle and two oxygen nozzles are formed at the front end of the composite lance. The rotary joint is connected to the composite lance through a shaft. The shaft is embedded inside the rotary joint, and the rotary joint has a small diameter inlet on one side, and an oxygen supply pipe is formed below the inlet, and a large diameter on the other side. Body is formed and the socket of the city gas inlet pipe is connected to the inlet of the joint, Inside the body of the insert, an inner tube and a shaft are fitted respectively, and between the body and the shaft of the rotary joint there is a bearing for snap ring, spring and shaft rotation from one side, the bearing is fixed by the snap ring, the rotary joint and Two O-rings are inserted in the part where the inner tube is in contact with the joint and the shaft, and the inner ring of the inner tube where the rotary joint is in contact with the inner tube is fitted with a snap ring and a spring to make the inner tube close. The other end of the shaft is connected to the composite lance, which is secured with a cover nut, between which a gasket is fitted and the outside of the shaft is supported by a bearing housing.

1 and 2 are a cross-sectional view and a plan view showing a conventional electric furnace and a lance

3A is a view showing the rotary composite lance of the present invention, FIG. 3B is a cross-sectional view taken along line AA of FIG. 3A, FIG. 3C is a longitudinal cross-sectional view of the portion "B" of FIG. 3A, and FIG. 3D is "C" of FIG. 3A. Is a cross-sectional view of the portion, and FIG. 3E is a partial cross-sectional view of portion "D" of FIG.

4 is an enlarged view showing the rotary joint of the present invention;

Fig. 5 is a partial sectional view showing the construction of a two-way rotary joint of the present invention.

Figure 6A is a view showing a gas supply of the rotary composite lance of the present invention, Figure 6B is a cross-sectional view showing the self-rotation of the rotary composite lance of the present invention.

7 is a view showing an electric furnace low temperature cutting operation using the rotary composite lance of the present invention.

<Description of the symbols for the main parts of the drawings>

4a: rotary joint 3b: composite lance

3d: bearing housing 3e: cylinder

4c: Torch Lance 30: Turn Guide

5b: entrance 5c: inner tube

4b: shaft 5f, 5g: snap ring

5h: spring 5i: O-ring

The present invention is described below with reference to the accompanying drawings.

Fig. 3A shows the rotary composite lance of the present invention, Fig. 3B shows an A-A cross sectional view of Fig. 3A, Fig. 3C shows a longitudinal cross-sectional view of part “B” of Fig. 3A, and Fig. 3D. A cross-sectional view of portion "C" of 3A is shown, and a cross-sectional view of portion "D" of FIG. 3A is shown in FIG. 3E.

Fig. 3A shows the overall configuration of the rotary composite lance. The rotary composite lance of the present invention is largely divided into a rotary joint 4a and a composite lance 3b.

The composite lance 3b has a head connected to the rotary joint 4a, and the composite lance 3b is fixed by a bearing housing 3d which is the center of rotational movement. A cylinder 3e for rotating at an angle is provided.

Referring to Fig. 3E, a turn guide 30 is formed on the outer circumference of the composite lance 3b, and the turn guide 30 is connected to the operating portion of the cylinder 3e.

In addition, the coolant inlet 3f and the outlet 3g are installed on the side of the composite lance 3b, and a connection port connected to a flexible hose (not shown) is coupled to each coolant inlet and outlet.

The internal flow channel formation structure of the composite lance 3b is shown in Figs. 3B and 3C. A total of four inner pipes are formed therein, and the first pipe 31 is a supply pipe for the city gas LPG, which is a heat source, and the second pipe ( 32 is an oxygen supply pipe, the third pipe 33 is a cooling water inlet pipe, and the fourth pipe 34 is composed of a cooling water discharge pipe.

At the tip of the composite lance 3b, one illustrated gas nozzle 35 and two oxygen nozzles 36 and 37 are formed, as shown in FIG. 3D.

The configuration of the rotary joint of the present invention will be described with reference to FIG.

A rotary joint body 4a for changing two directions of rotation while forming two flow paths is connected to the rotary composite lance 3b through the shaft 4b.

The internal configuration of the rotary joint of the present invention is shown in the cross sectional view of FIG.

Referring to Fig. 5, a shaft 4b is embedded inside the body 4a, and the shaft 4b has a flange 4d and is connected to the composite lance 3b with bolts and nuts.

On the other hand, the head of the composite lance 3b includes a torch lance 4c, which is a double gas pipe through which a flame source flows.

The rotary joint 4a for rotating the city gas and oxygen while forming two flow paths has a small diameter inlet 5b on the left side, and an oxygen supply pipe 5d is formed below the inlet 5b and the right side. There is formed a large diameter body.

The socket (5a) of the city gas inlet pipe is connected to the inlet (5b) of the joint and fixed with a nut, and the inner pipe (Inner) in a manner to have two flow paths formed inside the body of the rotary joint (4a) Tube 5c and shaft 4b are fitted.

Between the body of the rotary joint 4a and the shaft 4b, a bearing 5e for rotation of the snap ring 5e, the spring 5h and the shaft 4b from the left side is incorporated, and the bearing 5e ) Is fixed by the snap ring 5f.

In addition, two O-rings 5i are inserted into a portion where the rotary joint 4a and the inner tube 5c contact and a portion where the joint 4a and the shaft 4b contact with each other to maintain airtightness.

A snap ring 5g and a spring 5h are provided on the shoulder of the inner tube 5c at the portion where the rotary joint 4a and the inner tube 5c come into contact with the inner tube 5c.

In addition, the inner end 5c of the rotary joint 4a and the right end of the shaft 4b are connected to the composite lance 3b, and are fixed with the cover nut 5j, and the gas ?? 5k is sandwiched therebetween. .

In this way, the composite lance 4b and the rotary joint 4a are connected, and the inner tube 5c and the shaft 4b therein are rotatable without gas leakage, and the outside of the shaft 4b is connected to the bearing housing 5m. It is configured to be supported.

Fig. 6A shows a gas supply of the rotary composite lance of the present invention, LPG is supplied to the socket 5a, oxygen is supplied to the oxygen supply pipe 5d, and the coolant enters the coolant inlet 3f and the coolant outlet 3g. To be discharged.

6B is a cross-sectional view showing the self-rotation of the rotary composite lance of the present invention, with the city gas nozzle 35 and oxygen nozzles 36 and 37 at the tip of the composite lance 3b.

The composite lance 3b is capable of self rotation in the downward 120 degree range as shown in the figure by the operation of the cylinder 3e, not shown in FIG. 6B.

The operation of the rotary composite lance capable of low-temperature cutting with the present invention will be described.

Rotary composite lance of the present invention by applying a composite lance combined with oxygen and a city gas to act as a heat source of the lance itself at low temperature, two oxygen nozzles (36, 37) and one city gas at the tip of the lance nozzle The nozzles 35 interact with each other to ignite the sparks and allow the rotation of the lance itself so that the cutting operator can efficiently perform the work while freely adjusting the direction of the sparks due to the formation of scrap metal.

After all, the operation of the rotary composite lance of the present invention, as shown in Figure 7 from the beginning of the arcing without the heat source of the electric furnace itself, the composite lance (3b) in the electric furnace (1a) inside the shangdong, swing and lance itself by the rotation of the lance itself Allows you to adjust the exact flame direction required.

Rotary composite lance for electric furnace low temperature cutting of the present invention configured as described above can perform the scrap cutting operation from the beginning of operation during the melting of scrap metal in the electric furnace and efficient operation by adjusting the flame direction and flow rate of the lance during cutting and refining operations It is effective in improving productivity by reducing the unit of electricity usage and shortening the working time.

Claims (3)

It consists of a rotary joint (4a) and a composite lance (3b), The composite lance 3b has a turn guide 30 formed on an outer circumference thereof, and the turn guide 30 is connected to the operating portion of the cylinder 3e, and the head of the composite lance 3b has a coolant inlet 3f and an outlet 3g. ) Is installed at the side, and the inner flow path of the composite lance 3b is formed with a city gas supply pipe 31, an oxygen supply pipe 32, a coolant inlet pipe 33, and a coolant discharge pipe 34. At the front end of 3b, one city gas nozzle 35 and two oxygen nozzles 36 and 37 are formed. The rotary joint 4a is connected to the composite lance 3b via a shaft 4b, the shaft 4b is embedded inside the rotary joint 4a, and the rotary joint 4a has a small diameter inlet at one side. The oxygen supply pipe 5d is formed below the inlet 5b with the 5b, and a large diameter body is formed on the other side, and the socket 5a of the city gas inlet pipe is connected to the inlet 5b of the joint. An inner tube 5c and a shaft 4b are fitted into the body of the rotary joint 4a, respectively, and a snap ring 5e and a spring 5h from one side between the body and the shaft 4b of the rotary joint 4a. And a bearing 5e for rotation of the shaft 4b, the bearing 5e is fixed by a snap ring 5f, and a portion where the rotary joint 4a and the inner tube 5c contact and the joint 4a. And two O-rings 5i are inserted at the contact portion between the shaft and the shaft 4b, and the rotary joint 4a and the inner tube 5c are in contact with each other. A snap ring 5g and a spring 5h are attached to the shoulder of the inner tube 5c of the portion so that the inner tube 5c comes into close contact with the other end of the inner tube 5c and the shaft 4b provided in the rotary joint 4a. Rotary composite lance for electric low temperature cutting, which is connected to the composite lance 3b and fixed with a cover nut 5j, and a gasket 5k is inserted therebetween, and the outside of the shaft 4b is supported by a bearing housing 5m. . The method of claim 1, LPG is supplied to the socket (5a), oxygen is supplied to the oxygen supply pipe (5d), the cooling water enters the cooling water inlet (3f) and the rotary composite lance for electric furnace low temperature cutting is discharged to the cooling water outlet (3g). The method of claim 1, The composite lance (3b) is a rotary composite lance for electric low-temperature cutting capable of self-rotating in the range of 120 degrees downward by the operation of the cylinder (3e).