Electric furnace

Abstract

An electric furnace according to an embodiment of the present disclosure comprises: a furnace body; a roof, comprising electrode holes each of which an electrode rod penetrates, for opening and closing the top of the furnace body; sleeves disposed on the roof, each comprising a hollow space corresponding to an electrode hole and the inner circumferential surface forming the hollow space facing the outer circumferential surface of an electrode rod; and sealing members provided to seal the gap between the inner circumferential surface of a sleeve and electrode rod, restricting air outside the roof from flowing into the electrode holes via the sleeves, wherein the sealing members are in contact with the electrode rods and inner circumferential surface of the sleeves and are detachably adhered to the latter.

Description

electric furnace

[0001] The present disclosure relates to fixing an electrode rod of an electric furnace to an electric furnace loop.

[0002] Generally, truss structures are frame structures in which joints are connected with pins to prevent members from bending; arch, suspension, and beam forms are commonly used, and these lightweight truss structures are widely utilized as structural members for construction and civil engineering that can withstand heavy loads. Truss structures are typically used in truss bridges.

[0003] Prefabricated truss bridges, a type of such truss bridge, are utilized by continuously connecting truss panels, which serve as individual units, along their lengths. More specifically, the truss panels consist of upper and lower chords, as well as multiple vertical and diagonal members for connecting the upper and lower chords; the vertical and diagonal members are fixedly connected to the upper and lower chords at one end and the other end, respectively, by welding. Additionally, connecting points are provided at both ends of the upper and lower chords to connect adjacent upper and lower chords via pins.

[0004] However, existing prefabricated truss bridges are assembled in a straight line as the upper and lower chords are designed to have equal lengths, but there is a problem in that sagging occurs due to self-weight and superimposed loads. When such sagging occurs, drivers' eyes are directed toward the ground when entering the bridge, causing anxiety, and vehicle drivability also deteriorates. Therefore, to compensate for this, camber, which causes the initial shape to rise upward, was introduced during the fabrication of prefabricated truss bridges; however, the reality is that existing prefabricated truss bridges are constructed without considering camber at all.

[0005] One aspect of the present disclosure aims to provide an electric furnace that can easily seal the gap between an electrode rod and an electrode hole.

[0006] The technical problems to be solved in this document are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which this invention belongs from the description below.

[0007] According to an embodiment of the present disclosure, the electric furnace comprises a furnace body, a loop including an electrode hole through which an electrode rod passes and which opens and closes the upper part of the furnace body, a sleeve disposed on the upper side of the loop and having a hollow corresponding to the electrode hole, wherein the inner surface forming the hollow is arranged to face the outer surface of the electrode rod, and a sealing member arranged to seal the space between the inner surface of the sleeve and the electrode rod to restrict air from outside the loop from flowing into the electrode hole through the sleeve, wherein the sealing member is arranged to contact the inner surface of the sleeve and the electrode rod, respectively, and is detachably coupled to the inner surface of the sleeve.

[0008] The above sealing member is provided with a ceramic rope and is made of a material having fire resistance of 1500 degrees or more.

[0009] The inner surface of the above sleeve is made of a material having fire resistance of 1500 degrees or more.

[0010] One end of the sealing member is provided to be in contact with the inner surface of the sleeve, and the other end of the sealing member is provided to be positioned toward the electrode hole.

[0011] The sealing member is fixed to the inner circumference of the sleeve, and a holder provided on the inner side of the sleeve is further included.

[0012] One end of the sealing member is provided to be embedded inside the sleeve.

[0013] The sealing member is provided as a ceramic rope that wraps around the outer surface of the electrode rod and is configured to move along the circumferential direction of the inner surface of the sleeve and be separated from the inner surface of the sleeve.

[0014] The sealing member is provided as a ceramic rope that wraps around the outer surface of the electrode rod, and is arranged to move from the outer side of the inner surface of the sleeve along the circumferential direction of the inner surface of the sleeve to be coupled with the inner surface of the sleeve.

[0015] The holder is provided to move along the circumferential direction of the inner surface of the sleeve, and a sealing member fixed to the holder is provided to move along the circumferential direction of the inner surface of the sleeve in conjunction with the movement of the holder.

[0016] When the above holder is moved in one direction, the sealing member fixed to the holder is configured to move along the circumferential direction of the inner surface of the sleeve in conjunction with the movement of the holder, so as to be separated from the inner surface of the sleeve.

[0017] When the above holder is moved in one direction, the sealing member fixed to the holder is arranged to move along the circumferential direction of the inner surface of the sleeve in conjunction with the movement of the holder and to be coupled with the inner surface of the sleeve.

[0018] According to an embodiment of the present disclosure, a ceramic rope disposed on the inner surface of the electric furnace and the sleeve is arranged to come into contact with each other, thereby sealing the gap between the electrode rod and the electrode hole and minimizing oxidation of the electrode rod surface, which can improve the reliability of the electric furnace operation.

[0019] FIG. 1 is a drawing showing a planar view of a portion of an electric furnace according to one embodiment of the present disclosure.

[0020] FIG. 2 is a cross-sectional view of a portion of an electrode according to one embodiment of the present disclosure.

[0021] FIG. 3 is a cross-sectional perspective view of a sleeve of an electric furnace according to one embodiment of the present disclosure.

[0022] Figure 4 is a drawing showing the state in which the sealing member in Figure 3 has detached.

[0023] FIG. 5 is a cross-sectional view of a portion of an electrode according to another embodiment of the present disclosure.

[0024] FIG. 6 is a cross-sectional perspective view of a sleeve of an electric furnace according to another embodiment of the present disclosure.

[0025] FIG. 7 is a drawing illustrating the sealing member moving further in FIG. 6.

[0026] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments should be understood by those skilled in the art to which the present invention pertains as merely the most preferred embodiments of the present invention and do not represent all technical concepts of the present invention. Therefore, various equivalents or modifications that can replace them at the time of filing this application should be understood to be included within the scope of the rights of the present invention.

[0027] Additionally, the same reference numerals or symbols presented in each drawing of the present disclosure represent parts or components that perform substantially the same function.

[0028] Furthermore, the terms used in this disclosure are for describing embodiments and are not intended to limit or restrict the disclosure. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this disclosure, terms such as “comprising” or “having” are intended to specify the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the disclosure, and do not preclude the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0029] Additionally, terms including ordinal numbers, such as “first,” “second,” etc., used in this disclosure may be used to describe various components, but said components are not limited by said terms, and said terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of this disclosure, the first component may be named the second component, and similarly, the second component may be named the first component. The term “and / or” includes a combination of a plurality of related described items or any of a plurality of related described items.

[0030] Furthermore, in this disclosure, the meaning of "identical" includes items that are similar in attributes or similar within a certain range. Additionally, "identical" means "substantially identical." The meaning of "substantially identical" should be understood as including within the scope of "identical" numerical values ​​that fall within the margin of error in manufacturing or differences that do not hold significance relative to a reference value.

[0031] In addition, terms such as "~part," "~unit," "~block," "~part," and "~module" may refer to a unit that processes at least one function or operation. For example, the above terms may refer to at least one piece of hardware such as an FPGA (field-programmable gate array) or ASIC (application specific integrated circuit), at least one piece of software stored in memory, or at least one process processed by a processor.

[0032] Singular expressions include plural expressions unless there is an obvious exception in the context.

[0033] Meanwhile, terms such as “front,” “rear,” “left,” and “right” used in the following description are defined based on the drawings, and the shape and position of each component are not limited by these terms.

[0034] Hereinafter, preferred embodiments according to the present disclosure will be described in detail with reference to the attached drawings.

[0035] FIG. 1 is a plan view of a portion of an electric furnace according to one embodiment of the present disclosure, FIG. 2 is a cross-sectional view of a portion of an electrode furnace according to one embodiment of the present disclosure, FIG. 3 is a cross-sectional perspective view of a sleeve of an electric furnace according to one embodiment of the present disclosure, and FIG. 4 is a view showing the state in which the sealing member in FIG. 3 has been detached.

[0036] Referring to FIGS. 1 to 4, the electric furnace includes a furnace body (10) in the shape of a container with an open top that can accommodate a certain amount of raw material, and a roof (20) that covers the open top of the furnace body (10).

[0037] The electric furnace is typically provided in the shape of a rod and includes an electrode rod (30) made of artificial graphite. By supplying current to the electrode rod (30), an arc is generated between the raw material and the electric furnace, and the raw material, such as scrap and ferroalloy, is melted by the arc heat to produce molten steel.

[0038] The electrode rod (30) can be inserted into the interior of the furnace body (10) through the electrode hole (21) provided in the loop (20).

[0039] The electrode rod (30) and the raw material inside the furnace body (10) must be maintained at a constant distance apart so that an arc can be generated to melt the raw material. The electric furnace may be configured to lower the electrode rod (30) to maintain a constant distance between the electrode rod (30) and the raw material during operation, so as the raw material melts, to prevent the gap between the electrode rod (30) and the raw material from widening.

[0040] Accordingly, a predetermined separation distance may be created between the electrode rod (30) and the electrode hole (21) so that the electrode rod (30) can be lowered easily.

[0041] The inside of the furnace body (10) can be maintained at a negative pressure so that fumes and dust that may be generated during operation of the electric furnace do not leak out of the furnace body (10), and accordingly, the leakage of fumes and dust out of the furnace body (10) can be minimized due to the separation between the electrode rod (30) and the electrode hole (21).

[0042] On the other hand, external air from the furnace body (10) may flow in through the gap between the electrode rod (30) and the electrode hole (21), and the surface of the electrode rod (30) may oxidize due to the external air, causing the diameter of the electrode rod (30) to shrink, and consequently, a problem may arise in which the efficiency of the electric furnace operation is reduced.

[0043] To prevent this, an electric furnace according to one embodiment of the present invention may include a sleeve (40) disposed on the upper side of a loop (20) and a sealing member (100) provided to seal the space between the inner surface (42) of the sleeve (40) and the electrode rod (30).

[0044] The sealing member (100) seals the gap between the inner surface of the sleeve (40) and the outer surface of the electrode rod (30), thereby preventing outside air from entering through the gap between the electrode rod (30) and the electrode hole (21).

[0045] The electric furnace may include a plurality of electrode rods (30), a plurality of electrode holes (21) corresponding to the number of electrode rods (30), a plurality of sleeves (40) corresponding to the plurality of electrode holes (21), and a plurality of sealing members (100). Since each configuration is formed identically, a single electrode rod (30), electrode hole (21), sleeve (40), and sealing member (100) will be described below as examples.

[0046] The sleeve (40) includes a hollow (41) corresponding to the electrode hole (21), and the inner surface (42) forming the hollow (41) may be arranged to face the outer surface of the electrode rod (30).

[0047] The sleeve (40) may include an outer shell (43) that forms the exterior of the sleeve (40).

[0048] The sleeve (40) may include a main body (44) made of a fire-resistant material on the inner side of the outer shell (43).

[0049] For example, the outer shell (43) may be provided to be combined with the loop (20). However, it is not limited to this, and the main body (44) itself may be provided to be combined with the loop (20).

[0050] The main body (44) can be made of a material that is fire-resistant to temperatures of approximately 1500 degrees or higher.

[0051] The inner surface (42) of the sleeve (40) may also be provided as the inner surface of the main body (44) and may be made of the same material as the main body (44). However, it is not limited thereto, and the inner surface (42) of the sleeve (40) may be made of a material different from the main body (44), and may be made of a material with higher fire resistance than the main body (44).

[0052] The radius of the hollow (41) of the sleeve (40) can be made smaller than the radius of the electrode hole (21). This is to increase the sealing performance of the sealing member (100).

[0053] The sleeve (40) can be positioned on the upper side of the loop (20) such that the center of the hollow (41) and the center of the electrode hole (21) are positioned at a location that corresponds approximately in the vertical direction.

[0054] The sealing member (100) may be provided to seal the space between the inner surface (42) of the sleeve (40) and the electrode rod (30) to restrict external air from flowing into the electrode hole (21) through the sleeve (40).

[0055] The sealing member (100) can be extended in an annular shape to wrap around the outer surface of the electrode rod (30) along the circumferential direction of the electrode rod (30).

[0056] For example, the sealing member (100) may be made of a material having fire resistance of 1500 degrees or more.

[0057] For example, the sealing member (100) can be made of a ceramic rope.

[0058] One end (101) of the sealing member (100) may be arranged to be in contact with the inner surface (42) of the sleeve (40). For example, at least a portion of the one end (101) of the sealing member (100) may be arranged to penetrate the inner surface (42) of the sleeve (40) and be inserted into the main body (44), so that at least a portion of the one end (101) of the sealing member (100) is inserted into the main body (44) while in contact with the inner surface (42) of the sleeve (40). Accordingly, the sealing member (100) and the sleeve (40) may be arranged to be sealed.

[0059] The other end (102) of the sealing member (100) may be arranged to be in contact with the outer surface of the electrode rod (30). As the other end (102) of the sealing member (100) and the outer surface of the electrode rod (30) are arranged to be in contact, the electrode rod (30) and the sealing member (100) may be arranged to be sealed.

[0060] That is, as one end (101) of the sealing member (100) is arranged to be sealed with the sleeve (40) and the other end (102) of the sealing member (100) is arranged to be sealed with the electrode rod (30), the sealing member (100) can be arranged so that the gap between the inner surface (42) of the sleeve (40) and the electrode rod (30) is sealed.

[0061] The other end (102) of the sealing member (100) can be positioned so as to face the direction in which the electrode hole (21) is positioned from the general portion (101). That is, the sealing member (100) can be positioned downward from the inner surface (42) of the sleeve (40) in the direction in which the electrode hole (21) is located. As the electrode rod (30) descends during the operation of the electric furnace, friction may occur between the electrode rod (30) and the sealing member (100). However, as the sealing member (100) is positioned at an angle in the direction of movement of the electrode rod (30), the frictional pressure during the movement of the electrode rod (30) can be minimized.

[0062] The sealing member (100) can be coupled to the sleeve (40) so as to be separable from the inner surface (42) of the sleeve (40). This is because if the sealing member (100) is worn out or damaged, the sealing performance of the sealing member (100) deteriorates and replacement is required.

[0063] The sleeve (40) may include a holder (45) provided so that the sealing member (100) is coupled to the sleeve (40).

[0064] For example, the holder (45) can be embedded inside the main body (44). The holder (45) embedded inside the main body (44) can be arranged to be coupled with one end (101) of the sealing member (100).

[0065] For example, the holder (45) can be provided in various structures that can be combined with the sealing member (100). For example, the holder (45) can be provided in the form of a clamp to mechanically fix the sealing member (100).

[0066] However, not limited thereto, the holder (45) may be disposed on the inner surface (42) of the sleeve (40) so that the sealing member (100) can be coupled and separated on the inner surface (42) of the sleeve (40).

[0067] For example, the holder (45) may be formed in an annular shape along the circumferential direction of the sleeve (40) and may be formed to be combined with the entire end portion (101) of the sealing member (100).

[0068] For example, the holder (45) may be provided in multiple numbers and the multiple holders (45) may be spaced apart along the circumferential direction of the sleeve (40) and arranged to be coupled with at least a portion of the end portion (101) in the circumferential direction at the end portion (101) of the sealing member (100).

[0069] The main body (44) may include a seating space (44a) provided to allow a holder (45) to be placed inside the main body (44). A holder (45) may be placed inside the seating space (44a).

[0070] For example, the seating space (44a) may be provided as an annular space extending in the circumferential direction of the sleeve (40) inside the main body. As the holder (45) must support the sealing member (100) along the circumferential direction of the sleeve (40), the seating space (44a) may also be provided in a shape extending along the circumferential direction of the sleeve (40).

[0071] However, not limited thereto, the seating space (44a) may be provided as a plurality of independent spaces spaced apart along the circumferential direction of the sleeve (40). A plurality of holders (45) may be provided to be placed in each independent space.

[0072] For example, the volume of the holder (45) in the combined state (45a) where the holder (45) is combined with the sealing member (100) and the volume of the holder (45) in the released state (45b) where the combination with the sealing member (100) is released may differ, so the seating space (44a) may be provided as a space having a larger volume than the volume of the holder (45).

[0073] For example, as the holder (45) is positioned inside the main body (44), the inner surface (42) of the sleeve (40) may include an insertion hole (47) provided so that at least a portion of one end (101) of the sealing member (100) is inserted into the holder (45).

[0074] The insertion hole (47) can be provided in an annular shape along the circumferential direction of the inner surface (42) of the sleeve (40) so that the annular sealing member (100) is inserted into the holder (45).

[0075] One end (101) of the sealing member (100) can be arranged to pass through the inner surface (42) of the sleeve (40) through the insertion hole (47) and be inserted into a holder (45) disposed inside the main body (44).

[0076] Accordingly, when the sealing member (100) is coupled to the holder (45), one end (101) of the sealing member (100) can be coupled to the sleeve (40) in a state where it is in contact with the inner surface (42) of the sleeve (40).

[0077] For example, the sealing member (100) may be provided to be inserted along the circumferential direction of the insertion hole (47). At this time, at least a portion of the insertion hole (47) may include an incision area provided to facilitate the insertion of the sealing member (100).

[0078] However, not limited thereto, the sealing member (100) may be provided to be inserted into the insertion hole (47) in the radial direction of the sleeve (40).

[0079] Conversely, when the sealing member (100) is detached from the slab (40), the sealing member (100) may be configured to detach from the slab (40) by being ejected from the insertion hole (47).

[0080] For example, the sealing member (100) may be provided to be displaced along the circumferential direction of the insertion hole (47). In this case, at least a portion of the insertion hole (47) may include an incision area provided to facilitate the displacement of the sealing member (100).

[0081] However, not limited thereto, the sealing member (100) may be provided to be pulled out into the insertion hole (47) in the opposite direction to the radial direction of the sleeve (40).

[0082] For example, the holder (45) can be controlled by the control unit of the electric furnace to switch from the released state (45b) to the coupled state (45a). Conversely, the control unit of the electric furnace can control the holder (45) so that the holder (45) switches from the coupled state (45a) to the released state (45b).

[0083] However, not limited thereto, the holder (45) may be configured to be in either a coupled state (45a) or an uncoupled state (45b) as the user operates the holder (45).

[0084] When replacement of the sealing member (100) is required, the holder (45) may be switched from a coupled state (45a) to a released state (45b), and one end (101) of the sealing member (100) may be detached through the insertion hole (47).

[0085] Afterwards, one end (101) of the new sealing member (100) is inserted into the holder (45) through the insertion hole (47), and the holder (45) is switched back from the released state (45b) to the coupled state (45a), and the one end (101) of the sealing member (100) is coupled to the sealing member (100) to be coupled to the sleeve (40).

[0086] In this way, the sealing member (100) can be easily replaced from the sleeve (40), and the sealing member (100) can be arranged to seal the sleeve (40) and the electric furnace (30) between the sleeve (40) and the electric furnace (30). Additionally, the main body (44) of the sleeve (40) can be made of a material with high fire resistance, and the sealing member (100) can also be made of a material with high fire resistance to increase the reliability of the electric furnace.

[0087] Hereinafter, an electric furnace according to another embodiment of the present invention will be described. Except for the automatic replacement device (200) of the sealing member (100) and the configuration linked to the automatic replacement device (200) described below, the configuration is the same as that of the electric furnace according to the above-described embodiment, so redundant descriptions are omitted.

[0088] FIG. 5 is a cross-sectional view of a portion of an electrode according to another embodiment of the present disclosure, FIG. 6 is a cross-sectional perspective view of a sleeve of an electric furnace according to another embodiment of the present disclosure, and FIG. 7 is a view showing the sealing member being further moved in FIG. 6.

[0089] The holder (45) described below may be provided as a plurality of holders (45) or as a variable holder (45) that can be arranged inside the sleeve (40) in an annular shape. For convenience of explanation, the reference for the holder (45) when the holder (45) described below is moved is defined as the holder (45) that is first connected to the slab (40) among the plurality of holders (45), or the part of a single holder (45) that is first connected to the sleeve (40).

[0090] The electric furnace may include an automatic replacement device (200) configured to automatically replace the sealing member (100) from the sleeve (40) when the sealing member (100) needs to be replaced.

[0091] The automatic replacement device (200) can be configured to move a holder (45) connected to the sealing member (100) into the main body (44) so ​​that the sealing member (100) is automatically coupled with and detached from the sleeve (40).

[0092] The automatic replacement device (200) may be configured to communicate with the seating space (44a) of the main body (44). As the holder (45) placed on the automatic replacement device (200) moves to the seating space (44a) of the main body (44), the sealing member (100) fixed by the holder (45) may also move from the automatic replacement device (200) to the sleeve (40), thereby allowing the sealing member (100) to be moved automatically.

[0093] The automatic replacement device (200) may be configured to move a sealing member (100) requiring replacement, which is coupled to the sleeve (40), through a holder (45) to detach it from the sleeve (40), and to move a new sealing member (100) to be replaced through the holder (45) to supply it to the sleeve (40). Accordingly, the automatic replacement device (200) may be configured to automatically replace the sealing member (100) from the sleeve (40).

[0094] For example, the sealing member (100) that has been detached from the sleeve (40) by moving the holder (45) is moved to the automatic replacement device (200), and the holder (45) is released in a state (45b) and can be detached from the automatic replacement device (200) through various known methods.

[0095] The new sealing member (100) to be replaced is fixed by a holder (45) in an automatic replacement device (200), and the new sealing member (100) fixed to the holder (45) is moved together with the holder (45) to a seating space (44a) inside the main body (44), and the sealing member (100) is supplied to the sleeve (40) so that the sealing member (100) can be automatically replaced.

[0096] The electric furnace may include a guide rail (210) that is provided in the seating space (44a) and guides the holder (45) so that the holder (45) moves within the seating space (44a) along the circumferential direction of the sleeve (40).

[0097] The guide rail (210) may be provided in an annular shape so that the holder (45) moves along the circumferential direction of the sleeve (40) inside the seating space (44a).

[0098] The electric furnace may include a carrier (220) that slides on a guide rail (210) so that the holder (45) moves along the guide rail (45).

[0099] The carrier (220) can be configured to slide along the guide rail (210) via rollers, etc.

[0100] The carrier (220) can be connected to the holder (45).

[0101] The seating space (44a) can be provided as a space of volume in which the holder (45), the carrier (220), and the guide rail (210) can be seated.

[0102] The automatic replacement device (200) is configured so that the carrier (220) can slide and move the holder (45).

[0103] The guide rail (210) may include a connecting portion (211) that extends toward the automatic replacement device (200) so as to branch out from an annular shape to be connected to the automatic replacement device (200).

[0104] The holder (45) can be moved from the automatic replacement device (200) to the seating space (44a) through the connecting part (211), and conversely, can be arranged to be moved from the seating space (44a) to the automatic replacement device (200).

[0105] The connection portion (211) may be the point where the holder (45), which is combined with the sealing member (100), is withdrawn from the automatic replacement device (200) and begins to be combined with the sleeve (40).

[0106] The automatic replacement device (200) can be configured to continuously move the holder (45) that has entered the connection part (211) so that the holder (45) rotates the seating space (44a) in one direction.

[0107] One end (101) of the sealing member (100) is fixed to the holder (45), but the other end (102) of the sealing member (100) can be maintained in a state of being positioned on the outside of the sleeve (40) through the insertion hole (47). Accordingly, when the holder (45) moves along the circumferential direction of the sleeve (40), the other end (102) of the sealing member (100) can be moved along the circumferential direction of the sleeve (40) while remaining in a state of being positioned on the outside of the sleeve (40) along the insertion hole (47).

[0108] The automatic replacement device (200) may be configured so that the holder (45) moves back to the connecting part (211) as the holder (45) moves along the circumferential direction of the sleeve (40). When the holder (45) completes one rotation of the guide rail (210) and reaches the connecting part (211), the automatic replacement device (200) may be configured to terminate the movement of the holder (45).

[0109] At this time, the sealing member (100) fixed to the holder (45) can be moved along the circumferential direction of the sleeve (40) through the holder (45) and placed over the entire inner surface (42) of the sleeve (40) in the circumferential direction of the sleeve (40). Accordingly, the other end (102) of the sealing member (100) can be placed to wrap around the electrode rod (30) in the circumferential direction.

[0110] That is, when a new sealing member (100) is supplied to the sleeve (40), the new sealing member (100) connected to the holder (45) in the automatic replacement device (200) is connected in conjunction with the movement of the holder (45) along the circumferential direction of the sleeve (40) and in the radial direction of the sleeve (40), and when the movement of the holder (45) ends, the sealing member (100) is arranged in a shape that surrounds the electrode rod (30) so that the sealing member (100) seals the electrode rod (30) and the sleeve (40).

[0111] Conversely, if the sealing member (100) connected to the sleeve (40) needs to be replaced, the holder (45) is moved again from the connecting part (211) to the automatic replacement device (200), and the sealing member (100) fixed to the holder (45) can be collected from the automatic replacement device (200).

[0112] However, not limited to this, the holder (45) may move along the guide rail (210) in the opposite direction from a stationary state, reach the connecting part (211) again, and then move to the automatic replacement device (200).

[0113] When the holder (45) is moved to the automatic replacement device (200), the sleeve (40) remains in a state where the sealing member (100) is not attached, and when a new sealing member is fixed to the holder (45) in the automatic replacement device (200), the automatic replacement device (200) can be configured to move the holder (45) again so that the new sealing member (100) is attached to the sleeve (40).

[0114] Although the technical concept of the present invention has been explained above through specific embodiments, the scope of the present invention is not limited to these embodiments. Various embodiments that can be modified or varied by those skilled in the art within the scope that does not deviate from the gist of the technical concept of the present invention as specified in the claims shall also be considered to fall within the scope of the present invention.

Claims

1. Old body; A loop that opens and closes the upper part of the above waste and includes an electrode hole through which an electrode rod passes; A sleeve disposed on the upper side of the loop, including a hollow corresponding to the electrode hole, wherein the inner surface forming the hollow is arranged to face the outer surface of the electrode rod; A sealing member provided to seal the space between the inner surface of the sleeve and the electrode rod to restrict air outside the loop from flowing into the electrode hole through the sleeve; The above sealing member is It is arranged to contact the inner surface of the sleeve and the electrode rod, respectively, and An electric furnace detachably coupled to the inner surface of the sleeve.

2. In Paragraph 1, The above sealing member is provided with a ceramic rope and is an electric furnace provided with a material having fire resistance of 1500 degrees or more.

3. In Paragraph 1, An electric furnace in which the inner surface of the above sleeve is made of a material having fire resistance of 1500 degrees or more.

4. In Paragraph 1, An electric furnace in which one end of the sealing member is arranged to be in contact with the inner surface of the sleeve, and the other end of the sealing member is arranged to be positioned toward the electrode hole.

5. In Paragraph 1, An electric furnace that further includes a sealing member fixed to the inner surface of the sleeve and a holder provided on the inner side of the sleeve.

6. In Paragraph 1, An electric furnace in which one end of the sealing member is provided to be embedded inside the sleeve.

7. In Paragraph 1, The sealing member is provided as a ceramic rope that wraps around the outer surface of the electrode rod, and An electric furnace configured to move along the circumferential direction of the inner surface of the sleeve and be separated from the inner surface of the sleeve.

8. In Paragraph 1, The above sealing member is It is provided with a ceramic rope that wraps around the outer surface of the electrode rod, and An electric furnace arranged to be connected to the inner surface of the sleeve by moving from the outer side of the inner surface of the sleeve along the circumferential direction of the inner surface of the sleeve.

9. In Paragraph 5, An electric furnace in which the holder is arranged to move along the circumferential direction of the inner surface of the sleeve, and a sealing member fixed to the holder is arranged to move along the circumferential direction of the inner surface of the sleeve in conjunction with the movement of the holder.

10. In Paragraph 5, An electric furnace configured such that when the holder is moved in one direction, a sealing member fixed to the holder moves along the circumferential direction of the inner surface of the sleeve in conjunction with the movement of the holder and is separated from the inner surface of the sleeve.

11. In Paragraph 5, An electric furnace configured such that when the above-mentioned holder is moved in one direction, a sealing member fixed to the above-mentioned holder moves along the circumferential direction of the inner surface of the sleeve in conjunction with the movement of the above-mentioned holder and is coupled with the inner surface of the sleeve.

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