JP6579314B2 - melting furnace - Google Patents

Description

  The present invention relates to a melting furnace, and more particularly to a melting furnace that melts a metal while moving the furnace body.

  In an arc furnace, which is a type of melting furnace that melts metal material, in the space inside the furnace body in which the metal material is accommodated, a distance from the electrode is close, and a hot spot where the metal material is likely to melt, A cold spot is formed which is far from the metal material and hardly melts the metal material. In the cold spot, in order to solve the problem that it takes time to heat the metal material and the melting of the entire metal material proceeds non-uniformly, in Patent Document 1, the furnace body is positioned around the vertical axis with respect to the electrode. It has been proposed to switch between a cold spot and a hot spot by rotationally displacing them. In such an electric furnace, without using electric power for a pump for an extra water cooling section like a shaft furnace, and without supplying burner combustion energy etc. for exhaust gas composition optimization processing, By performing rotational displacement of the body, it is possible to eliminate thermal non-uniformity in the furnace and reduce the use of wasted power. Patent Document 2 discloses a specific configuration of an arc furnace capable of performing such rotational displacement of the furnace body and tilting of the furnace body for pouring.

JP 2014-40965 A JP 2015-48976 A

  A large number of facilities such as a water-cooled panel and a burner are attached to the furnace body of the arc furnace, and cooling water, air, gas, etc. used in these are supplied through piping. One end of these pipes is fixed to the furnace body. In this state, considering that the entire furnace body is rotationally displaced as in Patent Documents 1 and 2, the piping is made of a flexible material such as a flexible hose and the entire rotation range of the furnace body. It is necessary to use a length of piping that can follow the above. However, a load is likely to be applied to each part of the pipe due to its own weight, deformation of the middle part of the pipe accompanying the rotational displacement of the furnace body, and the like. Then, there is a possibility that the pipe itself and the connecting member connecting both ends of the pipe may be damaged, or that damage may lead to leakage of the fluid flowing inside the pipe. Moreover, the same problem is assumed also about the electric supply which supplies the electric power for driving the auxiliary equipment provided in the furnace body, and transmits the signal for controlling them.

  The problem to be solved by the present invention is to provide a melting furnace capable of protecting piping and wiring attached to the furnace body from damage caused by the movement of the furnace body in a melting furnace in which the furnace body is moved. is there.

  In order to solve the above-described problems, a melting furnace according to the present invention includes a furnace body that contains and melts a metal material, a furnace body motion mechanism that supports the furnace body movably on an installation surface, and one end of the furnace A pipe or wiring that is fixed to the furnace body and at least a part thereof is flexible, a support part that supports a midway part of the pipe or the wiring, and connected to the support part, in synchronization with the movement of the furnace body The present invention includes a gantry moving part that moves the support part on the installation surface, and a gantry provided on the installation surface so as to be movable in the vertical direction with respect to the furnace body.

  Here, in the gantry, the gantry moving part includes a wheel that moves on the installation surface, and the support part is provided by a connecting part that transmits the movement of the furnace body by the furnace body movement mechanism to the wheel. It is good to be connected to the furnace body so that it can move up and down. In this case, it is preferable that the connection portion has a pin structure that connects the gantry to the furnace body so as to be rotatable within a plane including the vertical direction. Moreover, it is preferable that a track for guiding the movement of the wheel is provided on the installation surface.

  The pedestal motion part may be provided in the middle part of the support part.

  Further, the furnace body is provided with an electrode for melting the metal accommodated in the furnace body when energized, and between the support part and the furnace body, between the support part and the gantry moving part, and the furnace body. It is preferable that an insulating member is provided in at least one portion between the furnace motion mechanism and the furnace body motion mechanism. In this case, the furnace body, the furnace body motion mechanism, and the support portion may be independently grounded.

  The installation surface may be tiltable while supporting the furnace body and the gantry.

  Further, it is preferable that at least one of the furnace body motion mechanism and the gantry is provided with a lock mechanism that regulates the motion of the furnace body and the gantry on the installation surface.

  In the melting furnace according to the above invention, the middle part of the piping or wiring is supported by the gantry, and the gantry moves in synchronization with the motion of the furnace body. The part moves with the furnace body while being supported by the gantry. This makes it difficult for a load due to its own weight or a load associated with the movement of the furnace body to be applied to the piping or wiring, and the piping or wiring is prevented from being damaged by these loads. Furthermore, since the gantry can move up and down with respect to the furnace body, even if there are irregularities on the trajectory of the gantry on the installation surface, when the gantry moves in synchronization with the furnace body, the gantry moves up and down. It is suppressed to vibrate. Therefore, it is possible to suppress the occurrence of damage to the piping or wiring due to the vertical vibration accompanying the movement of the gantry.

  Here, in the gantry, the gantry moving part is composed of wheels that move on the installation surface, and the support part can be moved up and down by the connecting part that transmits the movement of the furnace body by the furnace body movement mechanism to the wheel. When connected, the gantry can be moved in synchronism with the movement of the furnace body with a simple configuration.

  In this case, when the connecting portion has a pin structure that connects the gantry to the furnace body so as to be rotatable in a plane including the vertical direction, the gantry is connected to the furnace body in a state that allows the gantry to move up and down with a simple configuration can do.

  Further, if the installation surface is provided with a track for guiding the movement of the wheels, the gantry can be smoothly moved in synchronization with the movement of the furnace body.

  When the gantry moving part is provided in the middle part of the support part, the pipe or the wiring can be stably supported by the gantry and highly protected from application of a load.

  Further, when the furnace body is provided with an electrode that melts the metal accommodated in the furnace body by energization, between the support part and the furnace body, between the support part and the gantry motion part, the furnace body and the furnace body motion mechanism. According to the structure in which the insulating member is provided in at least one part between the currents when the current flows through the furnace body due to the current flowing through the electrodes, It is prevented that each part flows into the furnace body motion mechanism and adversely affects each part.

  In this case, if the furnace body, the furnace motion mechanism, and the support portion are independently connected to the ground, when the current flows through the furnace body, the current may flow through the above-mentioned parts and have an adverse effect. , More highly prevented.

  In addition, when the installation surface is tiltable with the furnace body and the gantry supported, even if a large rotational torque is applied to the furnace body from a pipe or wiring with one end fixed when the installation surface is tilted, Since the piping or the wiring is supported by a gantry that tilts together with the furnace body, the rotational torque applied to the furnace body can be reduced.

  In addition, when at least one of the furnace body motion mechanism and the gantry is provided with a lock mechanism that regulates the motion of the furnace body and the gantry on the installation surface, The body can be stably held on the installation surface. In particular, when the installation surface can be tilted while supporting the furnace body and the gantry, the tilting can be stably performed by keeping the motion of the furnace body regulated by the lock mechanism.

It is a top view which shows the electric furnace concerning one Embodiment of this invention. It is a side view which shows the said electric furnace. It is a side view which shows the mount part of the said electric furnace. It is a side view which shows the connection part between the furnace body and the mount frame of the said electric furnace. It is a top view which shows the outline of the support frame in the furnace motion mechanism of the said electric furnace. It is a figure which shows the state which inclined the said electric furnace to the taping side, (a) is a side view, (b) is sectional drawing along the direction which connects a taping port and a taping port. It is a top view which shows the deformation | transformation form of the said electric furnace.

  Hereinafter, an electric furnace will be described as an example of a blast furnace according to an embodiment of the present invention with reference to the drawings.

[Configuration of electric furnace]
1-3, the structure of the electric furnace 1 concerning one Embodiment of this invention is shown. The electric furnace 1 is installed on a platform (installation surface) 90. The platform 90 is supported by a support table 95 fixed to the floor surface F. The electric furnace 1 has a configuration of an electric furnace (an arc furnace) similar to that described in Patent Document 1 as a main body, and includes a furnace body 10, a furnace lid 20, and an electrode 25. In addition, the gantry 30 is installed on a common platform 90 where the electric furnace 1 is installed. In addition to these, the electric furnace 1 includes a pipe 40 and a furnace body motion mechanism 50.

  The furnace body 10 is formed as a bottomed cylindrical container having an opening above. The furnace lid 20 is a member capable of closing the opening of the furnace body 10 by being driven by a furnace lid motion mechanism (not shown), and by performing a vertical motion and a turning motion above the furnace body 10, It is possible to move between a state where the opening of the furnace body 10 is closed and a state where the opening is opened. Further, the three electrodes 25 are inserted through the furnace lid 20 without contacting the furnace body 10 and the furnace lid 20, and reach the space inside the furnace body 10. The three electrodes 25 are arranged around the central axis of the furnace body 10 so as to form a vertex of a substantially equilateral triangle. By storing a metal material such as iron scrap material in the furnace body 10 and applying a current such as a three-phase alternating current to the electrode 25 to perform discharge, the metal material can be melted. The electric furnace 1 is configured as an eccentric furnace bottom steel (EBT) type electric furnace, and is provided with a steel outlet 11 and a molten steel outlet 11 at which the molten steel is taken out at positions opposed to the side walls of the furnace body 10. An outlet 12 is provided for extracting the residue (not shown in FIG. 2).

  The furnace body 10 is supported by the platform 90 via the furnace body motion mechanism 50. As the furnace body movement mechanism 50, the thing similar to what is indicated by the said patent document 2 can be used. The structure of the furnace motion mechanism 50 will be briefly described. As shown in FIG. 5, an annular support frame 51 having a gear body formed on the inner peripheral surface 51 a is supported by a bearing member 52. The furnace body 10 is fixed to the support frame 51.

  Inside the support frame 51, gear boxes 53, 53 are provided at two opposing positions. Each gear box 53 accommodates two gears 54 and 55. The first gear 54 is rotatable in a plane parallel to the plane of the platform 90, and the rotation shaft is coupled to the motor. The second gear 55 is also rotatably provided in a plane parallel to the surface of the platform 90 and meshes with the first gear 54 and meshes with the gear body on the inner peripheral surface 51 a of the support frame 51. Yes. When the rotation of the first gear 54 is driven by the motor, the support frame 51 is rotated around the central axis via the second gear 55. Then, the furnace body 10 fixed on the support frame 51 is rotated (turned) around the central axis in the vertical direction. When the furnace body 10 rotates, the position of the electrode 25 along the surface of the platform 90 is not changed. Therefore, the relative arrangement of the furnace body 10 and the electrode 25 changes as the furnace body 10 rotates.

  Further, a lock mechanism 56 is provided inside the support frame 51 in the middle of the position where the gear boxes 53 and 53 are arranged along the circumferential direction of the support frame 51. The lock mechanism 56 includes a plug member 56 a provided facing the inner peripheral surface 51 a of the support frame 51, and a drive cylinder 56 b that can move the plug member 56 a forward and backward in the radial direction of the support frame 51. . The support frame 51 is provided with a sheath member (not shown) into which the plug member 56a of the lock mechanism 56 can be inserted and locked when the rotation position of the furnace body 10 is in the original position. Here, the original position of the support frame 51 means that the furnace body 10 is tilted together with the platform 90 by using the tilt mechanism 80 described below, and the output from the output port 11 and the output from the output port 12 are performed. Refers to the pivoting position that can be performed. While the support frame 51 rotates the furnace body 10, the locking member 56 is retracted inside the support frame 51 so that the plug member 56 a does not hinder the rotation of the support frame 51. On the other hand, while the rotation of the support frame 51 is stopped at the original position, the plug member 56a is advanced to the support frame 51 side by the drive cylinder 56b, and enters and locks on the sheath member provided on the support frame 51. Thus, the rotation of the support frame 51 can be restricted.

  As shown in FIGS. 1-3, the furnace body 10 is provided with various pipes 40 (two in the figure). The pipe 40 is fixed to equipment in which a fixed end 41 at one end is fixed to the floor 90 on which the platform 90 is installed, such as the platform 90 or a wall surface of a building. In the figure, the pipe is fixed to the wall surface of the building at the fixed end 41. The moving end 42 at the other end is fixed to the furnace body 10. The pipe 40 is at least partially made of a flexible material such as a flexible hose, and allows various fluids such as water, gas, and air to pass through the internal hollow portion. The flexible portion of the pipe 40 has a length sufficient to follow the rotation of the furnace body 10 by the furnace body motion mechanism 50 in a state where it is supported by the gantry 30 as described below. This type of piping 40 is used to supply fluid to various auxiliary equipment attached to the furnace body 10, and for example, for circulating water to be circulated through a water-cooled panel that cools the furnace body 10. The piping for supplying fuel gas to piping and the burner which assists the fusion | melting of the metal material in the furnace body 10 can be mentioned.

  A platform 30 is provided on the platform 90 adjacent to the furnace body 10. The gantry 30 includes a support portion 31 and wheels 32 as gantry motion portions. The gantry 30 has a frame structure in which a plurality of long metal materials are provided so as to intersect in a direction substantially parallel to a surface of the platform 90 and a direction substantially perpendicular to the surface. The support portion 31 is connected to the wheel 32 by a wheel coupling portion 33. The wheel coupling portion 33 and the wheel 32 are provided in the vicinity of the center of the support portion 31 along the direction connecting the gantry 30 and the furnace body 10. A midway portion of the pipe 40 is placed on the support portion 31 so as to pass between the intersecting metal materials. In order to avoid the vibration of the gantry 30 being transmitted to the pipe 40, the pipe 40 is not fixed to the gantry 30, but is merely placed on the metal material constituting the support portion 31. By rotating the wheel 32, the gantry 30 can move with the support portion 31 supporting the middle portion of the pipe 40. In the present embodiment, the gantry 30 is disposed at a substantially intermediate position between the steel outlet 11 and the steel outlet 12 along the circumferential direction of the furnace body 10 so as not to hinder the steel output and the steel output. .

  A connecting portion 60 that connects the gantry 30 to the furnace body 10 is provided between the gantry 30 and the furnace body 10. The connection part 60 connects the mount frame 30 to the furnace body 10 by a pin structure. Specifically, as shown in FIG. 4, the connecting portion 60 includes a furnace body side connecting material 61 fixed to the furnace body 10, a gantry side connecting material 62 fixed to the gantry 30, and the furnace body side. A connecting shaft 63 that connects the connecting member 61 and the gantry-side connecting member 62 is provided. The furnace body side connecting member 61 and the gantry side connecting member 62 are members each mainly having a substantially flat plate-like portion, and are fixed to the furnace body 10 and the gantry 30 by screw connection in a state where the flat plate surface is set substantially vertically. Has been. The furnace body side connecting member 61 is provided so as to protrude upward from the outside of the outer wall of the furnace body 10, and the gantry side connecting member 62 extends from the edge of the support portion 31 of the gantry 30 facing the furnace body 10. , Projecting toward the furnace body 10 side. That is, the protruding directions of the furnace body side connecting member 61 and the gantry side connecting member 62 are substantially orthogonal. Further, the flat plate surfaces of the furnace body side connecting member 61 and the gantry side connecting member 62 are superposed substantially in the vicinity of the tip. In the overlapping portions, through holes (not shown) are provided so as to overlap each other. Furthermore, the rod-shaped connecting shaft 63 is inserted through the through hole provided in the furnace body side connecting member 61 and the through hole provided in the gantry side connecting member 62 so as not to escape. The connecting shaft 63 can be rotated without being fixed to at least one of the furnace body side connecting member 61 and the gantry side connecting member 62. That is, the gantry 30 including the gantry-side connecting material 62 is connected to the furnace body 10 including the furnace-body-side connecting material 61 via the connecting shaft 63 so as to be rotatable in a vertical plane. Thereby, the gantry 30 can move up and down with respect to the furnace body 10.

  As shown in FIGS. 1 to 3, the platform 90 is provided with a groove-like rail (track) 91 that can move without the wheels 32 escaping, and the wheels 32 contact the platform 90 in the rails 91. is doing. Since the gantry 30 is connected to the furnace body 10 via the connecting portion 60 as described above, when the furnace body 10 is rotated by the furnace body motion mechanism 50, the gantry 30 is connected to the gantry 30 via the connecting portion 60. A force is applied in the circumferential direction of the body 10, and the gantry 30 follows the movement of the furnace body 10 and moves in synchronization with the rotation of the furnace body 10. It is formed in a substantially arc shape at a position corresponding to a trajectory through which the wheel 32 should pass when the 10 moves.

  The platform 90 on which the furnace body 10 and the gantry 30 are installed may be provided with a tilting mechanism 80. The tilting mechanism 80 tilts the furnace body 10 and the gantry 30 in a predetermined direction, and facilitates steeling and tapping from the furnace body 10. In this case, as the platform 90 is tilted, the relative arrangement between the fixed end 41 of the pipe 40 and the platform 90 is displaced. This displacement can be absorbed by the flexibility of the pipe 40. .

  The specific configuration of the tilt mechanism 80 can be the same as that disclosed in Patent Document 2 described above, but will be briefly described here. 2 and 6, the tilting mechanism 80 is formed in a convex curved surface shape along the direction connecting the gear 81 provided on the support base 95 and the steel outlet 10 and the ferrule 11 at the original position. And a gear 82 that meshes with the gear 81 on the support base 95 side. A cylinder 83 is rotatably coupled to the platform 90 at a position corresponding to the outer side of one end of the gear 82, and the cylinder 83 applies a force toward one of the upper and lower sides to one end of the platform 90, thereby supporting the platform 90. The platform 90 rolls on the support table 95 with the side gear 81 and the platform side gear 82 kept engaged. Thereby, the platform 90 can be tilted in the direction connecting the steel outlet 11 and the taphole 12 in the original position while supporting the furnace body 10 and the gantry 30 perpendicularly to the surface of the platform 90. . By this tilting, the steel output from the steel outlet 11 and the iron output from the steel outlet 12 are assisted. In the state of FIG. 6, the cylinder 90 applies a downward force to a portion of the platform 90 on the side of the spout 12, so that the platform 90 is inclined in a direction (direction T) to lower the position of the spout 12. The output from the output port 12 is assisted. While the platform 90 is tilted by the tilting mechanism 80, the lock mechanism 56 keeps the furnace body 10 from being rotated on the platform 90 by the furnace body moving mechanism 50.

  Further, in the electric furnace 1, insulating materials are provided at various places. Specifically, a connecting portion insulating plate 71 is provided between the furnace body side connecting member 61 and the furnace body 10 (FIG. 4). Moreover, the wheel part insulation board 72 is provided between the wheel coupling | bond part 33 and the wheel 32 of the mount frame 30 (FIG. 3). Further, a furnace body insulating plate 73 is provided between the bottom of the furnace body 10 and the support frame 51 of the furnace body motion mechanism 50 (FIG. 2). Each of the insulating plates 71 to 73 electrically insulates members disposed on both sides. Further, the furnace body 10, the gantry 30, and the bearing member 52 of the furnace body motion mechanism 50 are independently grounded by separate ground connection ports E1 to E3.

[Characteristics of electric furnace]
As described above, in the electric furnace 1 according to the present embodiment, the furnace body 10 can be rotated with respect to the electrode 25 to change the positional relationship between the furnace body 10 and the electrode 25. Thereby, the uniformity of heating and melting of the metal material in the furnace body 10 can be enhanced. That is, by inserting the electrode 25 arranged in a substantially equilateral triangle at the center of the substantially cylindrical furnace body 10, a hot spot that is close to the electrode 25 and is likely to become high temperature, and far from the electrode 25. A cold spot that is difficult to reach a high temperature is inevitably generated in the furnace body 10, but the furnace body 10 is rotated during the melting process of the metal material to change the positional relationship with the electrode 25. The positions of the hot spot and the cold spot in the inside can be appropriately changed to achieve uniform heating and melting. From the viewpoint of changing the positions of the hot spot and the cold spot as necessary and sufficient, the angular range in which the furnace body 10 can be rotated is preferably about 50 ° to 60 °.

  Thus, when the furnace body 10 rotates, the moving end 42 moves together with the furnace body 10 while the fixed end 41 of the pipe 40 is fixed to the platform 90. Since the pipe 40 has flexibility at least in part, the pipe 40 can be displaced and deformed following the movement of the furnace body 10. However, if the portion between the fixed end 41 and the moving end 42 of the pipe 40 is not supported by the gantry 30, the pipe 40 receives a large load due to its own weight. In addition, a force such as tension may be applied to the pipe 40 due to the motion of the furnace body 10, and an unreasonable load may be applied. These loads may cause various damages such as breakage of a material constituting the pipe 40 and loosening of a pipe connection structure such as a joint at the fixed end 41 and the moving end 42. These damages can also lead to a situation such as leakage of fluid flowing inside the pipe 40. However, in the electric furnace 1, the middle part of the pipe 40 is supported by the gantry 30, and the gantry 30 moves in synchronization with the rotation of the furnace body 10, so that the furnace body 10 rotates. However, it becomes difficult to apply a load due to excessive displacement or deformation to the pipe 40. Thereby, it is suppressed that damage arises in piping 40 or its connection structure with rotation of furnace body 10.

  The movement of the gantry 30 following the rotation of the furnace body 10 is such that the wheel 32 rotates on the rail 91 provided on the platform 90. If the platform 90 and the rail 91 are uneven, the unevenness Is transmitted to the gantry 30 as vertical vibration. When the gantry 30 vibrates up and down, the pipe 40 may receive vibration. The vibration of the gantry 30 may also cause damage to each part of the pipe 40, such as damage to the material constituting the pipe 40, loosening of the pipe connection structure such as a joint, etc., such as leakage of fluid flowing through the pipe 40 Can lead to However, in the electric furnace 1 according to the present embodiment, the furnace body 10 and the gantry 30 are connected to each other so as to move up and down by the connecting portion 60 having a pin structure. Even if it receives vibration, the vibration is absorbed by the vertical movement of the connecting portion 60. Thereby, it is avoided that the vibration of the gantry 30 is transmitted to the pipe 40 through the fixed end 41. Note that the gantry 30 is not limited to the pipe 40 for allowing the fluid to pass therethrough, at least one end of which is fixed to the electric furnace 1, such as electric wiring for driving and controlling various facilities attached to the furnace body 1, It can be used to support the middle part of various members that are partially flexible.

  The distance range in which the connecting portion 60 can move up and down may be equal to or greater than the height difference of the unevenness on the rail 91. In view of the typical unevenness of the platform that can support this type of electric furnace 1, the distance range in which the connecting portion 60 can move up and down may be about 1 to 50 mm. In the case of using the pin structure as described above, when converted into a rotation angle centered on the connecting shaft 63, assuming that the diameter of the furnace body 10 is about several meters to 10 meters, the rotation angle is 1 ° to 10 °. It only has to be about.

  As a specific structure of the connecting portion 60, the pedestal 30 is connected to the furnace body 10 so as to be movable up and down, and the motion of the furnace body 10 in the plane of the platform 90 is transmitted to the wheels 32 which are pedestal moving portions. Any device can be used as long as it can be moved following the furnace body 10, but by using the connecting portion 60 using the pin structure as described above, the gantry 30 can be obtained with a simple configuration. It is possible to move the gantry 30 on the platform 90 following the rotation of the furnace body 10 while securing the vertical movement. As a connection structure other than the pin structure that can move the gantry 30 on the surface of the platform 90 following the movement of the furnace body 10 while allowing the gantry 30 to move up and down, a bellows, a spring, an elastic material, and the like can be vertically expanded and contracted. The case where the mount frame 30 is connected to the furnace body 10 through a member capable of moving can be mentioned.

  As in the above embodiment, the gantry 30 is moved on the platform 90 by the wheels 32, so that the gantry 30 can be automatically moved following the movement of the furnace body 10 with a simple configuration. . Moreover, by providing the rails 91 through which the wheels 32 pass on the platform 90, the movement of the gantry 30 following the furnace body 10 can be smoothly guided. However, the gantry moving part is not necessarily limited to the wheel 32. In addition, for example, a configuration using a roller or a bearing can be given. In addition, as in the above-described embodiment, if the gantry 30 automatically follows the rotation of the furnace body 10 through a connection structure between the furnace body 10 and the gantry 30 such as the connecting portion 60. The motion of the gantry 30 can be easily synchronized with the motion of the furnace body 10 without driving the motion of the gantry 30 by an active mechanism. However, after ensuring synchronization, the gantry 30 is connected to the furnace body 10. Instead, the gantry 30 may be moved by an independent active mechanism.

  In the electric furnace 1 according to the above-described embodiment, the position where the wheel 32 that is the gantry moving part is provided is the vicinity of the center of the support part 31. Thus, by providing the gantry moving part in the middle part of the support part 31, that is, in a position excluding the end along the direction connecting the gantry 30 and the furnace body 10, the gantry 30 can support the pipe 40 in a balanced manner. The piping 40 can be effectively protected from the load caused by the weight of the piping 40 and the movement of the gantry 30 and the vibration accompanying it. Preferably, it is preferable to provide the gantry moving part at a position about 1/3 to 2/3 of the length of the support part 31 from the furnace body 10 side along the direction connecting the gantry 30 and the furnace body 10. Although only one wheel 32 may be provided on the gantry 30, two or more wheels 32 may be provided at positions passing through the same rail 91 from the viewpoint of support of the gantry 30 and stability of movement.

  In the electric furnace 1, the tilting mechanism 80 is not necessarily provided. However, in an electric furnace in which the steel is extracted from a position off the center of the furnace body like the EBT type furnace, there is usually provided some tilting mechanism. It is done. When the fixed end 41 of the pipe 40 is fixed to equipment fixed to the floor F such as a wall surface of a building, if the pipe 40 is not supported by the gantry 30, the furnace body 10 is tilted. The rotational torque due to the weight of the pipe 40 is directly applied to the furnace body 10 via the moving end 41. Therefore, the tilting of the platform 90 can also lead to damage to the furnace body 10, loosening of the pipe connection structure, and the like, similar to the turning of the furnace body 10. However, if the pipe 40 is supported by the gantry 30 that tilts together with the furnace body 10 as described above, the rotator 30 receives the rotational torque applied from the pipe 40 to the furnace body 10 and the pipe connection structure. Can be reduced. In the above embodiment, since the gantry 30 is provided at an intermediate position between the steel outlet 11 and the ferrule 12 so that the cradle 30 does not hinder the steel output or the fertilizer, the platform 90 is tilted at the original position. The direction to be made is substantially orthogonal to the direction in which the gantry 30 is arranged with respect to the furnace body 10. This relationship in direction also contributes to reducing the rotational torque applied to the furnace body 10 during tilting.

  As a measure for reducing the load applied to the furnace body 10 from the piping 40 in accordance with the rotation of the furnace body 10 on the platform 90 and the tilting of the platform 90, the furnace body 10 is strengthened in addition to providing the gantry 30. It is also possible to design it. However, the weight of the piping 40 and its contents may exceed 10 tons, and in order to sufficiently reduce the load from such heavy objects, the furnace body 10 needs to be very large and heavy. Become. On the other hand, by providing the gantry 30 and supporting the pipe 40 by the gantry 30, as described above, the load on the furnace body 10 is reduced without excessively designing the furnace body 10. be able to.

  As described above, when the platform 90 is tilted by the tilt mechanism 80, the rotation of the support frame 51 is locked by the lock mechanism 56 in the furnace body motion mechanism 50. Thereby, the rotation of the furnace body 10 on the platform 90 is regulated, and further, the movement of the gantry 30 on the platform 90 is regulated via the connecting portion 60. As a result, the furnace body 10 and the gantry 30 can be stably held in a state supported by the platform 90 even while the platform 90 is tilted. Since the furnace body 10 and the gantry 30 are connected by the connecting portion 60, if either one of the furnace body motion mechanism 50 or the gantry 30 is provided with a lock mechanism that can regulate the movement on the platform 90. The movement of both the furnace body 10 and the gantry 30 can be restricted. However, as described above, the movement of the furnace body 10 and the gantry 30 is performed by using the lock mechanism 56 that acts on the support frame 51 itself that is a driving source of the motion of the furnace body 10 and the gantry 30 and prevents its rotation. Can be effectively regulated. When only the lock mechanism 56 provided in the furnace body movement mechanism 50 cannot sufficiently regulate the movement of the gantry 30, such as when the weight of the gantry 30 is large, in addition to the lock mechanism 56 of the furnace body movement mechanism 50, the gantry 30 For example, a lock mechanism for restricting the rotation of the wheel 32 may be provided on the side.

  Furthermore, in the electric furnace 1 according to the above-described embodiment, the connection part insulating plate 71 is provided between the furnace body side connecting material 61 and the furnace body 10 of the connection part 60, so that the furnace body 10 and the gantry 30 can be connected. They are electrically insulated. Further, since the wheel part insulating plate 72 is provided between the wheel coupling part 33 and the wheel 32 of the gantry 30, the support part 31 of the gantry 30 and the wheel 32 are electrically insulated. Further, the furnace body 10 and the gantry 30 are independently grounded. Since an alternating current of the order of 10 kA flows through the electrode 25 inserted into the furnace body 10, induced currents of several A to several hundreds A also flow on the surface of the furnace body 10 made of metal. When such a large current flows to the wheel 32 via the connecting portion 60 and the support portion 31 of the gantry 30, a spark is generated at the portion of the wheel 32, and the smooth movement of the wheel 32 is prevented or the wheel 32 is irreversible. Damage may occur. When such a situation occurs in the wheel 32, the vertical vibration in the gantry 30 becomes large, and there is a possibility that it cannot be absorbed by the vertical movement of the connecting portion 60. Therefore, as described above, the furnace body 10 and the gantry 30 are insulated from each other, and the support 30 and the wheel 32 are insulated from each other in the gantry 30, and the furnace body 10 and the gantry 30 are independently grounded. By doing so, current is prevented from flowing from the furnace body 10 to the wheel 32.

  In addition, a furnace body insulating plate 73 is also provided between the furnace body 10 and the furnace body motion mechanism 50 to insulate between the two, and the furnace body motion mechanism 50 is grounded independently of the furnace body 10. ing. Thereby, the induced current flowing through the furnace body 10 is also prevented from flowing into the furnace body motion mechanism 50. When a current flows through the furnace motion mechanism 50, the bearing member 52 may be damaged. Then, not only the smooth rotation of the furnace body 10 is hindered, but also the vertical vibration is easily applied to the pipe 40 by the rotation of the furnace body 10 itself.

[Other forms]
In the electric furnace 1, various modifications other than the above embodiment can be considered. For example, in the above-described embodiment, only one connecting portion 60 that connects the furnace body 10 and the gantry 30 is provided, but a plurality of similar connecting portions 60 may be provided from the viewpoint of stabilizing the connection. For example, as shown in FIG. 7, a configuration in which two sets of connecting portions 60 and 60 are provided at positions corresponding to both end portions of the gantry 30 along the circumferential direction of the furnace body 10 can be exemplified. And what is necessary is just to connect between the gantry side connection materials 62 and 62 of two sets of connection parts 60 and 60 by the connection beam 62a.

  Further, the furnace body 10 is not limited to an electric furnace including an arc furnace, and any principle can be used as long as it is a melting furnace that can promote uniform melting of a metal material by moving the furnace body. Even if it is based, it can be applied. Further, the motion of the furnace body is not limited to rotation (turning) around the center of the furnace body, and any motion on the platform surface can be employed. Furthermore, the electric furnace is not limited to the above-mentioned EBT type, but may be of other types such as a brewing hot water type. However, when the tilting mechanism is provided as described above, there is no need for tilting. Central furnace bottom steel (CBT) type is excluded.

  As mentioned above, although embodiment of this invention was described in detail, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

1 Electric furnace (melting furnace)
DESCRIPTION OF SYMBOLS 10 Furnace 20 Furnace lid 30 Base 31 Support part 32 Wheel (base movement part)
33 Wheel coupling portion 40 Piping 41 Fixed end 42 Moving end 50 Furnace body motion mechanism 54, 55 Gear 56 Lock mechanism 60 Connecting portion 61 Furnace side side connecting material 62 Base side connecting material 63 Connecting shaft 80 Tilt mechanism 81, 82 Gear 83 Cylinder 90 Platform (installation surface)
91 rail (track)
95 Support stand

Claims (10)

A furnace body that houses and melts a metal material and rotates around a central axis in the vertical direction ;
A furnace body motion mechanism for supporting the furnace body movably on an installation surface;
One end is fixed to the furnace body, at least a part of the pipe or wiring having flexibility,
A support part for supporting a midway part of the pipe or wiring, and a support part connected to the support part and moving the support part on the installation surface in synchronization with rotation of the furnace body, A stand provided on the installation surface so as to be movable in the vertical direction with respect to the furnace body;
A melting furnace comprising: In the gantry, the gantry motion part includes a wheel that moves on the installation surface, and the support part moves up and down by a connecting part that transmits the rotation of the furnace body by the furnace body motion mechanism to the wheel. The melting furnace according to claim 1, wherein the melting furnace is connected to the furnace body as possible.   The melting furnace according to claim 2, wherein the connecting portion has a pin structure that connects the mount to the furnace body so as to be rotatable in a plane including a vertical direction.   The melting furnace according to claim 2 or 3, wherein a track for guiding the movement of the wheel is provided on the installation surface.   The melting furnace according to any one of claims 1 to 4, wherein the gantry moving part is provided in a middle part of the support part. The furnace body is provided with an electrode for melting the metal accommodated in the furnace body by energization,
An insulating member is provided between at least one part between the support part and the furnace body, between the support part and the gantry moving part, and between the furnace body and the furnace body motion mechanism. The melting furnace according to any one of claims 1 to 5.   The melting furnace according to claim 6, wherein the furnace body, the furnace motion mechanism, and the support portion are independently grounded.   The melting furnace according to any one of claims 1 to 7, wherein the installation surface is tiltable in a state where the furnace body and the gantry are supported.   The lock mechanism for restricting the movement of the furnace body and the gantry on the installation surface is provided in at least one of the furnace body motion mechanism and the gantry. The melting furnace according to claim 1. The melting furnace according to any one of claims 1 to 9, wherein the rotation of the furnace body is performed during the melting step of the metal material.

Images