JP3873329B2 - Arc furnace with preheater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an arc furnace with a preheating device.
[0002]
[Prior art]
Conventionally, a tower-shaped preheating device has been provided directly above the arc furnace to heat the melting raw material and melt it, and the exhaust gas heat generated at that time is used for preheating the melting raw material to be melted next. To save energy.
[0003]
Japanese Patent Publication No. 3-505625 is known as this type of arc furnace. This arc furnace is composed of a furnace body having a space for melting scrap inside the furnace body, and a furnace lid that closes the upper side of the furnace body, and the furnace lid is for discharging exhaust gas generated by the melting. An opening is provided. An electrode for heating the scrap is attached to the furnace lid, and a tower body having an internal space for storing the scrap is attached in a state of communicating with the opening. The furnace body is configured to be tiltable for hot water.
[0004]
According to the arc furnace as described above, the scrap can be heated and melted by the arc from the electrode. In addition, since the high-temperature exhaust gas generated at that time passes through the internal space and the scrap stored therein can be preheated, it is possible to save energy by utilizing the exhaust heat.
[0005]
However, in such a preheating device, the furnace lid and the tower are integrated, and in all cases, they can only be moved together. Therefore, when the molten metal was discharged, the furnace body could not be tilted unless the furnace cover was moved from the furnace body together with the preheating device from the top of the furnace body and a large gap was made between the furnace body and the furnace lid. . Therefore, heat dissipation during tilting is large.
[0006]
Therefore, the applicant of the present application has filed a patent application in Japanese Patent Application No. 7-282633 which has an arcuate periphery on the upper side so that the preheating device and the furnace lid can be separated and the furnace lid can be tilted while pouring out. .
However, in this case, the preheating device and the furnace lid are separated from each other. However, if the preheating device and the furnace lid are moved, the preheating device is moved by a carriage, and then the furnace lid is lifted by an overhead crane or the like. Had to move to.
[0007]
For this reason, a large space is required for placing them separately, and a high-temperature furnace lid must be hung up and down one by one.
[0008]
[Problems to be solved by the invention]
Therefore, in the arc furnace with a preheating device configured to tilt the furnace body to discharge the hot water, it is possible to prevent heat dissipation at the time of hot water discharge and does not require a large space or a slinging operation when opening the furnace lid. The purpose is to do so.
[0009]
Means for Solving the Problems, Embodiments of the Invention, and Effects of the Invention
The present invention includes a melting space for melting scrap, a furnace lid with an opening for discharging exhaust gas generated by melting the scrap, and an electrode that is detachably attached to the furnace lid, A furnace body configured to allow the molten metal in the space to be discharged by tilting;
In the arc furnace with a preheating device, which is communicated with the opening of the furnace lid of the furnace body and has a tower-like preheating device having an internal space for storing scrap, the preheating device and the furnace lid are separated from each other. In addition, the periphery of the opening of the furnace lid is formed in an arc shape centering on the central axis of the tilting of the furnace body, so that the furnace body can be tilted without moving the preheating device, and the hot water can be discharged. possible and configured to be, in the preheater, attaching the dolly to move the preheating device laterally, with a connection means and said furnace cover and preheating device, is connected if necessary, further The connecting means includes a hooking member that is suspended from the preheating device side so as to be movable up and down, and an engaged member that is provided on the furnace lid side and engages with the hooking member. And
[0010]
According to the present invention, the furnace body can be tilted while the furnace lid is separated from the preheating device and placed on the furnace body when the hot water is discharged. Therefore, since the furnace body can be tilted without opening the furnace lid, it is possible to prevent heat dissipation during the tapping. Moreover, since the furnace lid is connected to the preheating device and can be moved by the carriage, the preheating device and the furnace lid can be moved together when scrap is charged. Therefore, since it is not necessary to move the preheating device and the furnace lid separately, there is no need for a large space for placing the preheating device and the furnace lid separately, and it is not necessary to hang the furnace lid one by one, so that workability is good. .
[0011]
Further, when the connecting means is constituted by a hooking member that is suspended from the preheating device side so as to be movable up and down, and an engaged member that is provided on the furnace lid side and is engaged with the hooking member, By hooking or removing the engaged member, the preheater can be attached to or detached from the furnace lid.
[0012]
Furthermore, when the carriage rail is provided so that the carriage can move the preheating device from the outside of the furnace body to the center of the furnace body, scrap is charged from another basket without using the preheating device. In doing so, the furnace lid and the preheating device can be retracted and placed together outside the furnace body, and scrap can be dropped from the basket to the center of the furnace body. Moreover, when charging the scrap in the preheating device, the furnace lid and the preheating device can be moved together to the center of the arc furnace, and the scrap in the preheating device can be dropped.
[0013]
Thus, since the scrap can be charged in the center of the furnace body, the thermal efficiency is good, and the undissolved portion cannot be left near the furnace wall.
[0014]
【Example】
An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of an arc furnace 1 with a preheating device as viewed from the side.
As shown in FIG. 1, a preheating device 10 is disposed above the arc furnace 20.
[0015]
The arc furnace 20 includes a furnace body 21 and a furnace lid 30, uses an eccentric arc furnace having a melting space 22 and having an opening 32 in the upper part, and has a shape that allows hot water to be discharged at a slight tilt angle. . The arc furnace 20 can be tilted with the furnace lid 30 placed.
[0016]
The furnace lid 30 has an opening 31 in the lower part, and an opening 32 is provided in the upper part to match the opening 12 in the lower part of the preheating device 10. Reference numeral 36 denotes a peripheral edge of the opening 32 and is formed in an arc shape centering on the tilting central axis 25. Further, as shown in FIG. 2, reference numeral 38 denotes a seal for closing a gap between the furnace lid 30 and the preheating device 10. The seal 38 has a cylinder 39 attached to the upper surface of the bottom portion 33 of the furnace lid 30, and the seal 38 can be moved up and down as indicated by a dotted line by the operation of the cylinder 39. FIG. 3 is a cross-sectional view of the arc furnace 1 with a preheating device as viewed from the front. As shown in FIG. 3, the furnace lid 30 is provided with an electrode insertion hole 37 that is shifted from the center of the furnace lid 30. The electrode 28 is detachably provided in the electrode insertion hole 37.
[0017]
The preheating device 10 is provided in accordance with the opening 32 above the furnace lid 30.
Returning to FIG. 1, reference numeral 18 denotes a peripheral green of the lower opening 12 of the preheating device 10. The peripheral edge 18 does not mechanically interfere with the peripheral edge 36 of the opening 32 of the furnace lid 30 and has a circular arc shape centered on the central axis 25 so that a gap is formed between the peripheral edge 36 of the opening 32. It is formed so that
[0018]
As shown in FIG. 3, the preheating device 10 is provided so as to partially protrude from the furnace wall 23. The preheating device 10 has a scrap inlet 11 at the top, an opening 12 for connecting to the furnace lid 30 at the bottom, and a tower having an internal space 13 between the inlet 11 and the opening 12. A body 14 is provided. An openable and closable upper gate 17 and a lower gate 18 having vent holes are provided in the internal space 13 of the tower body 14.
[0019]
Reference numeral 15 denotes a bypass duct for sending exhaust gas from the lower internal space 13a to the upper internal space 13b. Reference numeral 16 denotes a discharge duct.
Returning to FIG. 1, the preheating device 10 includes a cart 19 below, and the cart 19 includes a hoisting mechanism 60 and a hoisting tool 70 for moving the furnace lid 30 up and down.
[0020]
As shown in FIGS. 1 and 4, the lifting device 60 is provided with a support 61 on the carriage 19, a motor 65 on the support 61, and a winding drum on the axis of the motor 65. is there. The motor 65 and the winding drum 62 are connected by a shaft 66.
[0021]
In addition, the hanging tool 70 is provided below the lifting tool winding mechanism 60 so that two rods 71 can be moved up and down so as to be parallel to the rail 40 inside the rail 40 and hooked on the hook 35 of the furnace lid 30. A hanging rod 72 having a hook for hanging is suspended and provided toward the end of the rod 71. The suspension rod 72 can be rotated by respective suspension rotation mechanisms 80 which will be described later, provided on the upper portion of the suspension rod 72 that is suspended. A pulley 75 for connecting to the wire rope 63 of the lifting device winding mechanism 60 is provided above the bar 71. The winding drum 62 and the pulley 75 of the hanging tool 70 are connected via a wire rope 63. In order to prevent lateral displacement of the eaves 71, the carriage 19 includes an elevating guide 67, and guide shafts 68 inserted through the opening holes of the elevating guide 67 are respectively attached to the upper portions of the eaves 71.
[0022]
As shown in FIGS. 5, 6, and 7, the hanging rod 72 and the hanging rod rotating mechanism 80 are suspended from the flange 71 and provided with a hanging rod 72. The hanging rod 72 has blades 72b extending linearly on both sides from the lower peripheral surface of the shaft 72a. A suspension 35 that engages with the blades 72 b is provided on the side frame 34 of the furnace lid 30. The suspension 35 has an opening 36 in the upper portion through which the shaft 72a and the blade 72b can be inserted, and has a space in which the blade 72b can rotate after the insertion. The suspension rod 72 is rotatable by an arm 82 and a cylinder 85 attached to the upper portion of the flange 71. The cylinder rod 83 connects the arm 82 and the cylinder 85. The cylinder 85 is fixed to the flange 71 via a bracket 86.
[0023]
Further, as shown in FIG. 8, the lifting / lowering device for the electrode 28 is provided with a turning support shaft 29 on the tilting floor outside the track 40, and can lift up the electrode 28 and turn to a position of 45 degrees as shown by the dotted line. It is. This is because if the pivot is provided at the center between the tracks, the electrode cannot be retracted unless it is pivoted at least 90 degrees. However, if the pivot support shaft 29 is provided outside the track 40, the electrode 28 is simply pivoted 45 degrees. The electrode 28 can be retracted or returned to its original position, so that the movement time of the electrode 28 can be shortened.
[0024]
Further, as shown in FIGS. 9A to 9C, the preheating device 10 and the furnace lid 30 are provided with tracks 40 so that they can move from the outside of the furnace body 21 to the center of the furnace body 21.
Such an arc furnace 1 with a preheating device is operated as follows. First, the electrode 28 is lifted from the furnace cover 30 and retracted to the side, and the seal 38 is lowered by the cylinder 39, and then the motor 72 is operated by placing the blade 72b of the suspension rod 72 on the suspension 35. Then, the wire 63 is wound up and the hanging tool 70 is lifted up. Then, the furnace lid 30 is raised, and as shown in FIG. 9 (a), the preheating device 10 and the furnace lid 30 are moved to the side of the arc furnace 20, and scrap is charged from the basket into the arc furnace 20. Next, as shown in FIG. 9B, the preheating device 10 and the furnace lid 30 are returned to their original positions on the arc furnace 20, the wire 63 is lowered, and the furnace lid 30 is fixed on the arc furnace 20. To do. And the seal | sticker 38 is raised and the clearance gap between the furnace cover 30 and the preheating apparatus 10 is sealed. Thereafter, the electrode 28 is inserted into the arc furnace, and then scrap is charged onto the gates 17 and 18 from the charging port 11 of the preheating device 10. Next, the electrode 28 is energized, and the scrap in the arc furnace 20 is melted by heating with arc heat or combustion heat loaded with oxygen. The exhaust gas generated at this time rises in the arc furnace 20 and enters the internal space 13 in the tower body 14 of the upper preheating device 10 through the furnace lid 30, and a part of the exhaust gas passes through the gap in the lower gate 18. Then, the scrap on the lower gate 18 is heated, and a part of the exhaust gas is sent from the lower internal space 13a through the bypass duct 15 to the upper internal space 13b and passes through the gap of the upper gate 17 from the top to the bottom. The scrap on the gate 17 is heated. The exhaust gas after heating the scrap is discharged from the discharge duct 16.
[0025]
The scrap thus heated is additionally charged into the arc furnace 20.
In the additional charging, the furnace lid 30 is lifted by the same operation as that for charging the scrap after the electrode 28 is retracted to the side of the pull-up. And as shown in FIG.9 (c), the trolley | bogie 19 is moved so that the center part of the preheating apparatus 10 and the center part of the arc furnace 20 may correspond substantially.
[0026]
At this position, the gates 18 and 17 are opened, and the scrap heated in the preheating device 10 is charged into the arc furnace 20. When the additional charging is completed in this way, the carriage 19 is returned to the original position shown in FIG. 9 (b), and the furnace lid 30 is lowered to the original position by the same operation as that for the above-described scrap charging, and the arc is moved. The electrode 28 is fixed on the furnace 20, and the electrode 28 is inserted into the arc furnace 20 again. The scrap is again charged on the gates 17 and 18 and is transmitted to the electrode 28. When a predetermined amount of molten metal accumulates in the arc furnace 20 in this manner, the seal 38 provided in the furnace lid 30 is lowered, and the hanging rod 72 is rotated in the horizontal direction by the hanging rod rotating mechanism 80 to suspend the furnace lid 30. The direction of the blade 72a is adjusted so that the blade 72a can pass through the opening hole 36 of the hand 35, the wire rope is wound up, the hoisting tool 70 is raised, and the furnace cover and the preheating device 10 are separated, as shown in FIG. 9 (d). As described above, the arc furnace 20 is a tilting device generally used, and the hot water is discharged while tilting in the direction of the arrow about the central axis 25.
[0027]
When pouring is finished, return the tilt to the original position and finish. The rest is this repetition. As described above, since the furnace lid 30 is detachably provided on the carriage 19 and can be moved or detached simultaneously with the preheating device 10, when loading scrap, the furnace lid 30 is lifted up together with the preheating device 10. Since it can move with the trolley | bogie 19, a scrap can be charged in the center vicinity of the arc furnace 20 in both initial charging and additional charging. Therefore, the thermal efficiency is good and the scrap does not remain melted.
[0028]
In addition, the furnace body 21 can be tilted while the furnace lid 30 is separated from the preheating device 10 and placed on the furnace body 21 when the hot water is discharged. Therefore, since a gap is not opened between the furnace lid 30 and the furnace body 21, heat dissipation during tilting can be prevented.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a main part viewed from the side of an arc furnace with a preheating device according to an embodiment.
FIG. 2 is a cross-sectional view of a principal part showing a mounting state of a seal.
FIG. 3 is a cross-sectional view showing a main part viewed from the front of an arc furnace with a preheating device.
4 is a front view showing the main part of the hanging tool as seen from AA in FIG. 1. FIG.
5A and 5B show a main part of engagement of a hanging rod, where FIG. 5A is a cross-sectional view of a hanging hand, and FIG. 5B is a cross-sectional view taken along line AA of FIG.
FIG. 6 is an explanatory diagram showing a main part of a hanging rod rotating mechanism.
FIG. 7 is a plan view showing a main part of a hanging rod rotating mechanism.
FIG. 8 is a plan view showing the arrangement of electrode pivot axes.
FIG. 9 is an explanatory diagram showing the operation of the preheating device and the arc furnace.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Arc furnace with a preheating apparatus, 10 ... Preheating apparatus, 13 ... Internal space, 14 ... Tower body, 17, 18 ... Gate, 20 ... Arc furnace, 21 ... Furnace body, 22 ... Melting space, 25 ... Central axis, 30 ... Furnace lid, 32 ... Opening part, 35 ... Suspension hand, 60 ... Suspension tool winding mechanism, 70 ... Suspension tool, 80 ... Hanging rod rotation mechanism, 40 ... Rail.

Claims (2)

A melting space for melting scrap, a furnace lid with an opening for discharging exhaust gas generated by melting of the scrap, and an electrode that is detachably attached to the furnace lid, the molten metal in the melting space A furnace body configured to be able to discharge hot water by tilting,
In the arc furnace with a preheating device, which is communicated with the opening of the furnace lid of the furnace body and has a tower-like preheating device having an internal space for storing scrap,
The preheating device and the furnace lid are separated from each other, and the periphery of the opening of the furnace lid is formed in an arc shape centering on the central axis of the tilting of the furnace body. It is configured so that the furnace body can be tilted and the hot water can be discharged.
The preheating device is provided with a connecting means for attaching a cart for moving the preheating device in the lateral direction, and connecting the preheating device and the furnace cover as necessary .
Further, the connecting means is constituted by a hook member that is suspended from the preheating device side so as to be movable up and down, and an engaged member that is provided on the furnace lid side and engages with the hook member. An arc furnace with a preheating device. The rail of the carriage, preheating device with arc furnace according to claim 1, wherein the該台wheel is provided so as to be movable to the preheating device to the center portion of the furnace body from the outside of the furnace body .

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