KR20020016027A - Apparatus for coating graphite arc electrode - Google Patents

Abstract

PURPOSE: Provided is a coating equipment for a carbon electrode which coats Al-12Si metal powder on the surface of the carbon electrode to raise acid-resistant property of the carbon electrode so that it prolongs life of the carbon electrode. CONSTITUTION: The coating equipment for the carbon electrode comprises the parts of: an injector for thermal spray powder which includes a housing(12), a connection block(14) with an orifice to supply a certain volume of steam and an anode electrode block(16); a powder injection part which includes a transfer for thermal spray powder and an insertion nozzle(32); and an electrode transfer which includes a base, a transfer plate and the carbon electrode to be distanced at regular intervals in the injector for thermal spray powder.

Description

Graphite electrode coating device {APPARATUS FOR COATING GRAPHITE ARC ELECTRODE}

The present invention relates to an electrode rod used in an electric furnace process of a steel mill, and more specifically, by spray coating on the surface of the graphite electrode rod mounted before and after and rotating the Al-12Si metal powder as a spray powder injector. The present invention relates to a graphite electrode coating device for improving the oxidation resistance to extend the life of electrode.

In general, scrap metal (SCRAP) input into an electric furnace process is charged into a ladle and then melted. In this case, in order to dissolve scrap metal in a ladle, three or more graphite electrode rods are usually added to the electrode rod, and then A current is applied to dissolve molten steel in the ladle as arc heat generated between the electrode and the surface of the scrap metal.

As a result, such graphite electrode rods are widely used as heating elements for other industrial electric resistance furnaces in addition to steel making furnaces in the steel industry, and since the expansion of industrial facilities and large-scale electric furnaces is made, the demand for graphite electrode rods is gradually increasing. As a result, the supply shortage of the graphite electrode rod and the resulting price increase cause the cost of steel products to rise, and thus, it is necessary to extend the life of the graphite electrode rod. There is no separate attempt to extend.

The present invention has been made in order to improve the conventional problems as described above, the object is to spray coating Al-12Si metal powder on the surface of the graphite electrode as a spray powder, to further extend the life of the graphite electrode The present invention provides a graphite electrode coating device.

In addition, another object of the present invention, by coating Al-12Si metal powder on the surface of the graphite electrode to extend the life of the graphite electrode, to reduce the cost of purchasing the graphite electrode to reduce the melting cost using the graphite electrode steel products The present invention relates to a graphite electrode coating device capable of reducing the cost of the graphite.

1 is a schematic view showing a graphite electrode coating device according to the present invention

Figure 2 is a perspective view showing a spray powder injector of the graphite electrode coating device according to the present invention

Figure 3 is a schematic cross-sectional view showing the internal structure of the present invention spray coating spray

Figure 4 is a schematic diagram showing the rear portion of the spray coating sprayer of the present invention

Figure 5 is a perspective view showing the electrode feeder of the present invention graphite electrode coating device

Explanation of symbols on the main parts of the drawings

10 .... Steam sprayer 12 .... Housing

14 .... Connecting block 14a .... Orifice

16 .... anode electrode block 18 ... cooling water passage

20 .. Chilled water line 22 .... Steam passage

24 .. Gas passage 26 .. Cathode electrode

30 .... Powder injection section 32 .... Injection nozzle

34 .... Cable 36 .... Powder Transfer Machine

40 .... electrode feeder 42 .... base

44 .. Guide rail 46 .... Handle

48 .... support plate 52 .... transfer plate

E ... electrode F ... flame

V .... Powder

As a technical configuration for achieving the above object, the present invention, the cathode electrode is installed inside, the atmosphere gas is supplied to the housing, and fixed to the front of the housing and a certain amount of steam is supplied through the housing therein A spraying powder injector having a connection block in which an orifice is installed, and an anode electrode block installed in front of the connection block, in which the cooling water at a predetermined temperature flows integrally inside the housing, the thermal block, and the anode electrode block;

The spray powder injection nozzle is installed at the end of the cable connected to the spray powder feeder to one side to inject a predetermined amount of spray powder into the flame (F) generated by the spray powder injector to inject a spray powder of a predetermined size (T). Equipped with powder injection section,

The base is installed on one side of the spray powder injector, the transfer plate is installed to move in the front and rear and left and right directions on the upper portion of the base, and is rotatably seated on the brackets provided on both sides of the upper transfer plate, The graphite electrode coating device configured as an electrode electrode conveyer having a graphite electrode (E) spaced by a predetermined distance (D) is by closing.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic view showing a graphite electrode coating apparatus according to the present invention, Figure 2 is a perspective view showing a spray powder injector of the graphite electrode coating apparatus according to the present invention, Figure 3 is an internal structure of the spray coating sprayer of the present invention Figure 4 is a schematic cross-sectional view, Figure 4 is a schematic view showing the rear portion of the spray coating sprayer of the present invention, Figure 5 is a perspective view showing the electrode feeder of the graphite electrode coating device of the present invention.

Graphite electrode coating device of the present invention is a spray powder injector 10 for dissolving the spray powder while generating a flame having a predetermined temperature and injection speed largely, the metal powder having a particle size of the spray powder injector 10 Movement and rotation of the powder injection unit 30 having the injection nozzle 32 to supply and the graphite electrode rod E coated with the spray powder having a predetermined particle size dissolved and injected into the flame F of the spray powder injector 10. While it can be largely divided into the electrode feeder 40 to perform the coating operation, as described in detail the respective components as follows.

2 to 4 illustrate the spray powder injector 10 of the graphite electrode coating apparatus of the present invention. When the injector 10 is divided again, the housing 12, the connection block 14, and the anode electrode block ( 16).

Meanwhile, a cathode electrode 26 is installed inside the housing 12, and a gas passage 24 for supplying an atmosphere gas surrounding the cathode electrode 26 is formed to penetrate to one side. In front of the), a connection block 14 having an orifice 14a installed therein is fixed, and the cathode electrode 26 passes through the orifice 14a.

Next, an anode electrode block 16 is fixed in front of the connection block 14 to generate the arc electrode and arc heat when a current is applied, and the housing 12 and the connection block 14 and the anode are fixed. The electrode block 16 is formed through the cooling water passage 18 through which the cooling water supply and discharge pipes 20a and 20b are connected to the rear, and the temperature S of the cooling water flowing therethrough is the plasma gas, which will be described in detail below. It should be maintained at a high temperature of 100 ° C or higher to prevent condensation of steam.

In addition, a steam passage 22 is connected to the housing 12 and the connection block 14 to the steam pipe 22a and sprays steam from the outlet 22b of the orifice 14a of the connection block 14. Is integrally formed through, the amount of steam passing through the steam passage 22 is made of 200-500mg / s.

Next, Figure 2 shows the powder injection nozzle 30, a metal at a constant flow rate, that is, 30-40 g / min, preferably 35 g / min to the flame (F) generated from the thermal spraying powder injector (10) The sprayed powder injection nozzle 30 is installed at an end of the cable 36 connected to the sprayed powder feeder 36 to one side of the sprayer 10 so as to spray the powder.

Next, FIG. 4 illustrates the above-described graphite electrode rod (E) feeder 40. The feeder 40 includes a base 42 installed on one side of the thermal spraying powder injector 10, and the base ( 42 is rotatably seated on the transfer plate 52 which is installed to move in the front and rear and left and right directions on the upper portion, and the brackets 56 installed on both sides of the upper portion of the transfer plate 52, the spraying machine spray injector 10 It is provided with a graphite electrode (E) spaced at a predetermined interval (D).

In addition, a moving block 48a moving along the guide rails 44 provided on both sides of the upper plate 42a of the base 42 is installed at the bottom, and a screw bar 46a driven at the handle 46 at the bottom of the central portion. A moving block moving along the guide rail 50 installed in front and rear on the support plate 48 on which the fixed block 46b is installed is installed at the bottom of the transfer plate 52.

On the other hand, in the center of the bottom of the conveying plate 52, a fixed block through which the screw bar 54a driven by the motor 54 is installed is installed so that the conveying plate 52 is moved back and forth when the handle 46 and the motor 54 are driven. It is installed to transfer left and right, the graphite electrode (E) is a motor 58 connected to one side of the bracket 56 installed on both sides of the upper transfer plate 52 to the inside of the rotating plate installed on both sides of the bracket 56 so as to rotate. It consists of a fixed configuration to rotate.

Referring to the operation and effects of the present invention made in the above configuration in more detail as follows.

As shown in Figures 1 to 4, the present invention, the graphite electrode coating device is sprayed on the graphite electrode (E) to the Al-12Si powder injected as the spray powder injector 10, the left and right and rotationally conveyed as the feeder 40. In order to increase the oxidation resistance and abrasion resistance of the graphite electrode (E), it is a device for extending the life of the graphite electrode (E).

On the other hand, electrodes are usually used to generate an arc between the charges by transferring current in the furnace, conventionally used electrodes made of carbon, but artificial graphite electrodes can be manufactured nowadays except for the small melting of ferroalloy Uses artificial graphite electrodes in almost all processes.

In addition, when operating the above-mentioned electric furnace, it consumes about 3-8kg per ton due to dissolution, oxidation, cutting, etc.In general, when the electrodes are shortened while connecting several cylindrical electrodes with NIPPLE, the new electrodes In order to prevent the loss in the high temperature oxidizing atmosphere, which is the main loss factor of the graphite electrode (E), the oxidizing metal material, that is, Al-12Si powder is thermally coated.

That is, the Al-Si powder as described above is known to have a relatively low melting point, but when exposed to an oxidative component crisis, oxide layers such as Al 2 O 3 and SiO 2 are formed to have erosion resistance and oxidation resistance.

Next, as shown in FIGS. 1 to 3, the cooling water passage 18 formed to be integrally communicated with the housing 12, the connection block 12, and the anode electrode block 16 of the spray powder injector 10 is formed. Cooling water supplied through the cooling water supply pipe 20a is supplied and discharged through the cooling water discharge pipe 20b installed at the rear center of the injector 10 through the passage 18.

At this time, the important thing is to maintain the temperature (S) of the cooling water to 100 ℃ or more according to the steam to be described later, which means that if the temperature of the cooling water is less than 100 ℃ hot steam is connected to the housing 12 and the connection block ( This is because condensation by the cooling water flowing through 14) makes normal arcing difficult, and the steam serves as a plasma gas of the thermal sprayer 10, as will be described in detail below.

Next, an arc is generated when an electric current, that is, a current of 8-11 Kw, is applied between the anode 26 installed inside the housing 12 and the cathode electrode block 16. Such an arc forms a plasma and ionizes it. The combined plasma recombines to generate a flame with an injection speed of 650 m / s at a high temperature of 16,500 ° C.

1 to 3, argon gas is introduced into the cathode electrode 26 as an atmospheric gas through the gas passage 24 formed in the housing 12, and the argon gas is disposed in the housing. It is supplied through the argon gas pipe 24a connected to the rear part of (12).

In addition, as shown in FIG. 4, an orifice 14a is installed inside the connection block 12 fixed to the front of the housing 12 to accelerate the flame F due to the arc. In the 14a, steam supplied in a predetermined amount, i.e., 200-500 mg / s, is supplied as a plasma gas by a steam pipe 22a connected to the rear portion through a steam passage 22 formed in the housing 12 and the connecting block 14. Sprayed.

In this case, the reason for using steam as the plasma gas is to dissolve the Al-12Si powder (V) introduced more smoothly. If the amount of steam is less than or more than 200 mg / s or 500 mg / s, the amount of steam is less and the plasma gas is used. In addition, it does not play an appropriate role, and the amount of steam is too high to make spraying of powder difficult.

As shown in FIG. 3, the powder V is sprayed on the flame F generated by the spray powder injector 10 described above with a specific particle size, that is, 90 to 110 μm, preferably 100 μm. The powder is sprayed onto the flame F through an input nozzle 32 connected as a cable 34 using a powder transfer machine 36 of METCO products.

At this time, if the particle size of the powder (V) is smaller than 90㎛ there is a fear that the particle size is too scattered during the powder injection, on the contrary, if larger than 110㎛ there is a problem that the dissolution of the powder by the flame (F) is difficult.

Next, as shown in Figure 5, when spray coating the Al-12Si powder on the graphite electrode (E) as described above, the graphite electrode (E) at a constant speed to advance and rotate to perform a coating operation.

In other words. Positioning operation should be performed so that the graphite electrode (E) is positioned at a predetermined distance (D), that is, 60-100 mm spaced to one side of the spray powder injector 10, which is the upper plate 42a of the feeder 40. When the handle 46 installed at the center is driven, the support plate 48 is moved back and forth by the screw bar 46a connected thereto.

Accordingly, the support plate 48 is a smooth movement of the lower moving block 48 along the guide rail 44 installed on the base upper plate 42a, so that the operator is the interval between the initial injector 10 and the graphite electrode (E) ( D) can be easily adjusted as the handle 46.

At this time, when the distance between the injector 10 and the graphite electrode (E) is less than 60mm, the spray coating on the surface of the electrode in the state that the complete dissolution of the powder is not achieved, if the larger than 100mm, uniform spray powder coating is made Will not.

Next, the transfer plate 52 provided with a moving block moving along the guide rails 50 installed at the front and back sides of the upper and lower sides of the support plate 48 has a screw bar 54a through a fixed block installed at the bottom center thereof. When driven as a connected motor 54, the transfer plate 52 moves in the left and right direction, and at this time, the graphite electrode rod E is interposed between the brackets 56 installed on both sides of the upper portion of the transfer plate 52 through a rotating plate. Is fixed.

Therefore, when driving the motor 58 connected to one side of the bracket 56, the graphite electrode (E) is rotated, and eventually the graphite electrode (E) is moved to the left and right as two motors, it is to rotate.

Accordingly, Al-12Si powder dissolved through the flame (F) of the thermal spray powder injector 10 is uniformly coated along the outer circumferential surface of the graphite electrode (E) in the dissolved state, and eventually the graphite electrode (E) The oxidation resistant layer is coated on the surface of the graphite electrode rod (E) is to extend the life.

On the other hand, although not shown in the drawing, in order to perform the coating of the graphite electrode (E) as described above, first, the graphite electrode (E) should be cleaned, blasted and intermediate coating in advance.

Thus, according to the graphite electrode coating device of the present invention, by spray coating Al-12Si metal powder on the surface of the graphite electrode as a spray powder sprayer, the life of the graphite electrode can be further extended.

In addition, by coating Al-12Si metal powder on the surface of the graphite electrode to increase the oxidation resistance of the graphite electrode to prolong the lifetime of the graphite electrode, the cost of purchasing the graphite electrode can be reduced and the melting cost using the graphite electrode can be reduced. There is an excellent effect of lowering the cost of the product.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to know that those who have knowledge of this can easily know.

Claims (6)

The cathode electrode 26 is installed therein, the housing 12 through which the atmospheric gas is supplied, and the orifice 14a fixed in front of the housing 12 and supplied with a predetermined amount of steam through the housing 12 therein. A connection block 14 to be installed and an anode electrode block 16 to be installed in front of the connection block 14, and the housing 12 and the thermal connection block 14 and the anode electrode block 16 Thermal spray powder injector 10 is integrally flowed in the cooling water therein; And, A certain amount of powder is injected into the end of the cable 36 connected to the spray powder feeder 36 to one side of the sprayer 10 so as to spray a predetermined amount of the spray powder into the flame F generated by the spray powder injector 10. A powder injection unit 30 having an injection nozzle 32 installed therein; And, A base 42 installed on one side of the thermal spray powder injector 10, a transfer plate 52 installed on the upper portion of the base 42 to move forward, backward, left and right, and both upper sides of the transfer plate 52. It is rotatably seated on the bracket 56 installed in the electrode feeder 40 having a graphite electrode rod (E) spaced at a predetermined distance (D) from the spraying machine spray injector (10); Graphite Electrode Coating Equipment According to claim 1, wherein the particle size of the powder (V) is formed 90-110㎛, graphite spacing rod, characterized in that the spacing (D) of the injector 10 and the graphite electrode (E) is composed of 60-100mm. Coating device According to claim 1, wherein the housing 12, the connection block 14 and the anode electrode block 16 is formed through the cooling water passage (18) integrally connected to the cooling water supply and discharge pipes (20a, 20b) in the rear portion , The graphite electrode coating device characterized in that the temperature (S) of the cooling water flowing through it is configured to be maintained at 100 ℃ or more The steam pipe 22a of claim 1, wherein a steam pipe 22a is connected to the housing 12 and the connection block 14, and steam is injected from the outlet 22b of the orifice 14a of the connection block 14. Passage 22 is integrally formed through, the amount of steam passing through the steam passage 22 is graphite electrode coating device, characterized in that consisting of 200-500mg / s The screw of claim 1, wherein the movable block 48a moving along the guide rails 44 provided on both sides of the upper plate 42a of the base 42 is installed at the bottom, and the handle 46 is driven at the bottom of the central portion. A moving block moving along the guide rail 50 provided in front and rear on the support plate 48 on which the fixed block 46b through which the bar 46a communicates is installed is installed at the bottom of the transfer plate 52, and the transfer plate ( In the center of the bottom of the 52 is a fixed block through which the screw bar 54a driven by the motor 54 is installed, and the conveying plate 52 is installed so as to be transported back and forth and left and right when driving the handle 46 and the motor 54. Graphite electrode coating device The method of claim 1, wherein the graphite electrode (E) is a motor 58 connected to one side of the bracket 56 provided on both sides of the upper portion of the transfer plate 52 to the inside of the rotating plate installed on both side brackets 56 so as to rotate. Graphite electrode coating device, characterized in that fixed to rotate