KR20100046844A - Door of electric furnace - Google Patents

Abstract

PURPOSE: A door of an electric furnace is provided to prevent the reduction of coupling force due to thermal expansion because the cover plate has a curvature. CONSTITUTION: A door of an electric furnace comprises a rear plate(51) covering a door hole of the electric furnace, a front plate(52) positioned separate from the rear plate, a flow path part(53) built in between the rear plate and the front plate to form a flow path, a cover plate(54) attached to the ends of the rear and front plates, an inlet pipe(55) installed on the upper side of the cover plate and connected to the flow path, an outlet pipe(56) installed on the lower side of the cover plate and connected to the flow path, a water feed pipe(57), a drain pipe(58) and a circulation tank(59).

Description

Electric furnace door {DOOR OF ELECTRIC FURNACE}

The present invention relates to an electric furnace, and more particularly, to an electric furnace door that opens and closes a door hole formed in an electric furnace so that an operator can work in the electric furnace and prevents damage by heat of the electric furnace.

In general, there is an electric furnace device for melting the scrap iron inside the electric furnace using electricity in the field of manufacturing molten steel in steel mills.

In such an electric furnace device, scrap metal is introduced into the electric furnace, and a fixed electrode connected to the anode cable is provided at the bottom of the electric furnace.

In addition, the electrode rod connected to the cathode cable is installed above the electric furnace to move up and down.

Therefore, when the electrode moves downward to approach the scrap iron, an arc is generated by the interaction between the cathode and the cathode, and the scrap iron is dissolved into the molten metal due to the heat.

Usually, three electrode rods are formed in an electric furnace apparatus, and the power source is three-phase alternating current and the capacity reaches several hundred to several thousand kW.

On the other hand, the electric furnace is provided with a door that the operator can enter and exit to cut the scrap metal. The door is formed above the point where the scrap metal melts to form molten steel, thereby preventing the molten steel from being discharged.

The operator enters the furnace through the door and uses a cutter to cut the scrap metal. When the scrap iron is cut in this way, the scrap iron cut inside the electric furnace is closely arranged.

The door is moved up and down by a hydraulic or pneumatic cylinder to open the opening hole of the electric furnace.

Conventional electric doors use a thick iron plate to withstand heat, but since the load of the iron plate is large, a large capacity cylinder for moving the iron plate must be used.

In addition, since the door of the conventional electric furnace is made of iron plate and heated by heat, there is a problem that the door exchange occurs frequently due to heat deformation due to the door heating for a long time.

Therefore, there is a need for improvement.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an electric furnace door that reduces the load while reducing the load due to heat deformation.

In order to achieve the above object, the present invention is a rear plate for covering the door hole of the electric furnace; A front plate spaced apart from the rear plate; A flow path portion embedded between the rear plate and the front plate to form a flow path; An edge plate coupled to the ends of the rear plate and the front plate; An inlet pipe provided at an upper portion of the edge plate and communicating with the flow path; A discharge pipe provided below the edge plate and communicating with the flow path; A water supply pipe communicating with the inflow pipe; A drain pipe communicating with the discharge pipe; And a circulation tank connected to the water supply pipe to supply the cooling water and connected to the drainage pipe to which the cooling water flows.

The flow path portion is characterized in that the partition is provided to guide the coolant to move in a zigzag.

The frame is welded to the rear plate and the front plate.

The edge plate is characterized in that the cross section has a curvature.

As described above, the electric furnace door according to the present invention has an effect of preventing heat deformation by cooling water cooling.

The electric furnace door according to the present invention is designed to have a curvature of the rim plate, thereby preventing the coupling force decrease due to thermal expansion.

Hereinafter, an embodiment of an electric furnace door according to the present invention with reference to the accompanying drawings.

In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or custom.

Therefore, definitions of these terms should be based on the contents throughout the specification.

1 is a view schematically showing an electric furnace device according to an embodiment of the present invention, Figure 2 is a view showing a door installed in the electric furnace according to an embodiment of the present invention, Figure 3 is an embodiment of the present invention It is a figure which shows the electric furnace door which concerns on an example.

Referring to FIG. 1, the electric furnace apparatus 100 includes an electric furnace 10 having a storage chamber 15 into which scrap metal 11 dissolved in waste water by arc heating is input and stored. The electric furnace 10 is installed at an upper part and spaced apart from the ground by the pedestal 12.

The fixed electrode 21 is exposed to the storage chamber 15 at the lower portion of the electric furnace 10 and is connected to the positive electrode cable 22.

An electrode rod 31 having a predetermined length is positioned above the electric furnace 10, which is connected to the negative electrode cable 32.

The electrode rod 31 is supported by the support portion 40. The support 40 is provided with a lift 41 whose vertical length is changed through hydraulic or gear coupling, and a clamp 42 coupled to the lift 41 and having one end coupled to the electrode rod 31.

Since the clamp 42 is a conductor connected with the electrode 31 to lift the electrode, the coupling part of the lift 41 and the clamp 42 is provided with an insulating cover 43 which is an insulator. As a result, the lift 41 is prevented from being damaged by the discharge during the operation.

1 and 2, a door hole 18 is formed at one side of the electric furnace 10. The worker cuts the scrap metal 11 into the electric furnace 10 through the door hole 18. Through the cutting process of the scrap 11, the scrap 11 is densely arranged in the storage chamber 15 of the electric furnace 10.

The door hole 18 is formed in the upper portion of the electric furnace 10 so that molten steel is not discharged through the door hole 18.

The door 50 covers the door hole 18, and the opening and closing device 60 changes the position of the door 50 so that the door 50 opens and closes the door hole 18.

The opening and closing device 60 according to an embodiment of the present invention is provided with a cylinder 61 and a lifting bar 62. The cylinder 61 is coupled to a fixed part such as the ground and is variable in length by hydraulic pressure or pneumatic pressure. The lifting bar 62 has one end coupled to the cylinder 61 and the other end coupled to the door 50. Therefore, due to the drive of the cylinder 61, the door 50 opens and closes the door hole 18.

Referring to FIG. 3, the door 50 according to an embodiment of the present invention has a rear plate 51, a front plate 52, a flow path part 53, an edge plate 54, an inlet pipe 55, and an outlet pipe 56. ), A water supply pipe 57, a drain pipe 58 and a circulation tank 59 are provided.

The rear plate 51 covers the door hole 18 of FIG. 2, and the front plate 52 is spaced apart from the rear plate. The rear plate 51 and the front plate 52 are made of an iron plate having the same size. If the outer peripheral surface of the electric furnace 10 is cylindrical, the back plate 51 and the front plate 52 have the same curvature as the outer peripheral surface of the electric furnace 10.

The flow path part 53 is positioned between the rear plate 51 and the front plate 52, and a flow path 532 for moving the coolant is formed.

The edge plate 54 is coupled to the ends of the rear plate 51 and the front plate 52. The edge plate 54 is provided with an upper plate 541, a side plate 542 and a lower plate 543. The upper side plate 541 is coupled to the upper surface of the rear plate 51 and the front plate 52, the side plate 542 is coupled to the side end surface of the rear plate 51 and the front plate 52, the lower plate 543 is the rear plate ( 51) and the bottom surface of the front plate (52).

The inflow pipe 55 is provided above the edge plate 54 and communicates with the flow path 532. Preferably, the inlet pipe 55 is formed on the edge plate 54 corresponding to the upper or left and right sides of the door 50 and communicates with the start of the flow path 532.

The discharge pipe 56 is provided below the edge plate 54 and communicates with the flow path 532. Preferably, the discharge pipe 56 is formed on the edge plate 54 corresponding to the lower or left and right sides of the door 50, and communicates with the end of the flow path 532.

The water supply pipe 57 communicates with the inflow pipe 55, the drain pipe 58 communicates with the discharge pipe 56, and the water supply pipe 57 and the drain pipe 58 communicate with the circulation tank 59. Cooling water is stored in the circulation tank 59, and supplies the cooling water to the water supply pipe 57 by a separate pump.

Therefore, since the coolant is circulated inside the door 50, even if the door 50 is heated by heat, thermal deformation or damage is prevented.

The flow path portion 53 is provided with a partition wall 531 forming the flow path 532. The partition wall 531 is spaced apart in the vertical direction, and forms a flow path 532 so that the cooling water moves in the zigzag direction from above.

The edge plate 54 is welded to the rear plate 51 and the front plate 52. This welding method improves the bonding force of the edge plate 54, and prevents the leakage of the coolant due to the excellent sealing.

On the other hand, since the edge plate 54, the rear plate 51 and the front plate 52 is made of a metal material and is expanded by heat, the bonding force of the portion joined by welding may be weakened. In order to prevent this, the edge plate 54 has a shape having a curvature in cross section.

The curvature may be formed on all the edge plates 54, but may be formed only on the lower side 543, which needs to maintain the bonding force due to thermal expansion. Both end surfaces of the lower plate 543 having the curvature are joined by welding in contact with the lower surfaces of the rear plate 51 and the front plate 52, respectively.

Referring to the operation of the electric door according to an embodiment of the present invention having a structure as described above are as follows.

The partition wall 531 is positioned between the rear plate 51 and the front plate 52 to have a flow path 532 in which the coolant moves in a zigzag shape, and the upper plate 541, the side plate 542, and the lower plate of the edge plate 54 are positioned. The side plate 543 is welded to the end of the rear plate 51 and the front plate 52.

In the above state, one end of the water supply pipe 57 is in communication with the circulation tank 59, and the other end is in communication with the inflow pipe (55).

One end of the drain pipe 58 communicates with the circulation tank 59, and the other end communicates with the discharge pipe 56.

When the rear plate 51 is positioned to cover the door hole 18 of the electric furnace 10 and drives the pump, the coolant stored in the circulation tank 59 is moved to the water supply pipe 57 and then communicated with the water supply pipe 57. The inflow pipe 55 is moved to the flow path 532.

The cooling water moving the flow path 532 is discharged to the outside of the flow path 532 through the discharge pipe 56 after performing the cooling function, and then moved along the drain pipe 58 to be introduced into the circulation tank 59.

On the other hand, although the components made of metal are expanded by the heat of the electric furnace 10, when the edge plate 54 has a curvature like the lower plate 543, both ends of the lower plate 543 are the rear plate 51 and the front plate. Welding is performed in contact with the end face of 52.

Therefore, even when the lower plate 543 is heated, it is not expanded laterally, so that the bonding force between the rear plate 51 and the front plate 52 is maintained.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art to which the art belongs can make various modifications and other equivalent embodiments therefrom. I will understand.

Therefore, the true technical protection scope of the present invention will be defined by the claims below.

1 is a view schematically showing an electric furnace apparatus according to an embodiment of the present invention.

2 is a view showing a door installed in the electric furnace according to an embodiment of the present invention.

3 is a view showing an electric furnace door according to an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10: electric furnace 18: door hole

51: Plate 52: Plate

53: euro part 54: border plate

55: inlet pipe 56: discharge pipe

59: circulation tank

Claims (4)

A rear plate covering the door hole of the electric furnace; A front plate spaced apart from the rear plate; A flow path portion embedded between the rear plate and the front plate to form a flow path; An edge plate coupled to the ends of the rear plate and the front plate; An inlet pipe provided at an upper portion of the edge plate and communicating with the flow path; A discharge pipe provided below the edge plate and communicating with the flow path; A water supply pipe communicating with the inflow pipe; A drain pipe communicating with the discharge pipe; And And a circulation tank connected to the water supply pipe to supply cooling water and connected to the drainage pipe to which the cooling water flows. The method of claim 1, The flow path unit is an electric furnace door, characterized in that the partition wall for guiding the cooling water to move in a zigzag. The method of claim 1, The edge plate is an electric furnace door, characterized in that welded to the rear plate and the front plate. The method of claim 1, wherein The border plate is an electric furnace door, characterized in that the cross section has a curvature.

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