JP2004077071A - Rotary kiln - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a damage of a welding part accompanying the thermal expansion of a kiln body by reducing a direct welding member to a shell part of the kiln body and reducing a positional deviation in the longitudinal direction of the kiln of a member supported by a roller and the roller. <P>SOLUTION: In the rotary kiln, the cylindrical kiln body 1 is rotatably supported in a laterally placed state. The kiln body 1 is stored in a cage-like frame body 10 in which a plurality of annular body 11 fitted with an outer periphery of the kiln body are fixed and connected by a connection member 12 directed in the longitudinal direction of the kiln. The rotary kiln is provided with clip members 13, 14 slidably bonding the shell of the kiln body 1 and the frame body 10 in the longitudinal direction of the kiln. The annular body 11 part is rotatably supported by the roller. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary furnace having a cylindrical furnace body which is driven to rotate in a horizontal state and which performs processes such as melting of a metal material, holding of a molten metal, and melting of waste.
[0002]
[Prior art]
Generally, a mixed-iron furnace installed in the front part of a steelmaking furnace temporarily stores hot metal from a blast furnace or an electric furnace to make the hot metal composition and temperature uniform, and to adjust the hot metal supply and hot metal demand in the steelmaking furnace. It is used for As a structure of the furnace, as shown in FIGS. 6 and 7, a ring 53 fixed to the outer peripheral portion of the horizontally placed cylindrical furnace body 1 is placed on a base 55 via a roller segment type roller 54. A furnace leg 56 rotatably supported or fixed to a lower portion of the furnace body 1 as shown in FIG. 8 is rotatably supported by a roller 58 mounted on a base 57, and is not shown in a hydraulic or electric type (not shown). The furnace body 1 is tilted and driven by a drive device to perform tapping.
[0003]
In the mixed iron furnaces 51 and 52 having the above-described configuration, the ring 53 and the furnace legs 56 are both directly welded to the steel shell as the surface material of the furnace body 1, but the molten iron at about 1300 ° C. The steel shell is heated to a high temperature of about 200 ° C., and the thermal expansion of the furnace body due to the temperature increase tends to cause cracks in the weld between the steel shell and the ring 53 and the furnace legs 56. The furnace legs 56 and the rollers 54 and 58 supporting the furnace legs 56 are displaced in the furnace length direction. Further, the furnace body 1 of the mixed iron furnace is large, and it is necessary to provide a corridor (not shown) through which workers pass for maintenance and inspection. This corridor is also welded to the steel shell of the furnace body 1. As a result, the welded portion was peeled off due to the thermal expansion of the furnace body 1 and the walkway was sometimes dropped.
[0004]
In the body of the furnace 1 of the mixed-iron furnace, there are provided a receiving port 4 for charging materials such as molten iron and scrap iron and a tapping port 5 for tapping molten metal. An opening / closing device (not shown), that is, an opening / closing door guide, a pivot shaft, an opening / closing drive, and the like are also welded to the steel shell of the furnace body 1 directly or via brackets or the like. Due to thermal expansion and thermal distortion of the steel shell, each part of the switchgear is twisted, which causes malfunction of the opening / closing operation and damage of members.
[0005]
On the other hand, a rotary melting furnace that melts aluminum scrap or cast iron, etc., charged through an opening at one end of a cylindrical furnace body by a burner provided at the other end of the furnace body, or has a center axis slightly shifted from a horizontal axis. In a rotary melting kiln or the like that melts waste by a burner in an inclined cylindrical furnace body, a ring attached to the steel shell of the furnace body by welding, similarly to the mixed iron furnace 51 shown in FIGS. 6 and 7 described above. Has a problem in that a crack is generated in the welded portion of the ring, and the position of the ring is displaced from the roller, similarly to the above.
[0006]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention is directed to solving the above-described conventional problems. The number of members directly welded to a steel shell of a furnace body is reduced to prevent damage to a welded part due to thermal expansion of the furnace body, and supported by rollers. It is a first object of the present invention to reduce the displacement of a supported member and a roller in a furnace length direction, and to prevent malfunction or damage of an opening / closing device when an opening is formed in a body of a furnace body. This is a second object.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the rotary furnace according to claim 1 is a rotary furnace in which a cylindrical furnace body is rotatably supported in a horizontal state, and a plurality of annular bodies fitted with the outer periphery of the furnace body are provided. A clip member that accommodates the furnace body in a cage-shaped frame body fixedly connected with a connecting member facing the furnace length direction and that couples the steel shell of the furnace body and the frame body slidably in the furnace length direction. In addition, the annular body is rotatably supported by a roller.
[0008]
According to the first aspect of the present invention, the annular body of the cage-shaped frame is supported by rollers in the same manner as a conventional furnace body support ring and furnace legs, and supports the furnace body rotatably. Although it functions as a member, the annular body (and the entire frame) is not welded to the steel shell of the furnace body. The resulting damage such as cracks and peeling is avoided. In addition, since the cage-shaped frame is not welded to the steel shell, the temperature rise and the resulting thermal expansion are smaller than the furnace body, and the positional displacement between the annular body and the rollers in the furnace length direction due to the thermal expansion is suppressed to a small amount, and further maintenance. A member, such as an inspection corridor, which has been conventionally welded to the steel shell of the furnace body, can be welded and mounted to the cage-shaped frame having a small thermal expansion, thereby preventing peeling or falling off of the welded portion.
[0009]
A rotary furnace according to a second aspect of the present invention is the rotary furnace according to the first aspect, wherein an opening and closing device for opening and closing a material charging and tapping opening provided in a body of the furnace body is provided in the cage-shaped frame. It is characterized by being supported by the body.
[0010]
According to this means, the cage-shaped frame is not welded to the steel shell of the furnace body, so that the temperature rise and the resulting thermal expansion are smaller than that of the steel shell, and since the frame is frame-shaped, the cage-shaped frame body has a lower thermal expansion. Since the thermal distortion is also small, each part of the switching device supported by this frame does not generate a large twist even when the temperature of the furnace body rises, and it is possible to open and close the opening without any damage to the members. it can.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to an example shown in FIGS. The figure shows a furnace body of a mixed iron furnace, 1 is a cylindrical furnace body closed at both ends by end plates, and a refractory 3 is lined on the inner surface side of a steel shell 2, and 4 is provided on its body. 5 is a tap hole.
[0012]
Reference numeral 10 denotes a cage-shaped frame made of H-shaped steel for accommodating the furnace body 1 on the inner diameter side, and a plurality of (three in this example) annular bodies 11 into which the outer peripheral portion of the furnace body 1 is fitted with a small clearance. Are fixedly connected by a connecting member 12 oriented in the furnace length direction. The furnace body 1 is fitted into the frame body 10, and the steel shell 2 of the furnace body 1 and the frame body 10 are moved in the furnace length direction by clip members 13 and 14 welded to the steel shell 2 of the furnace body 1. It is slidably connected. For one of the three annular bodies 11, the clearance S between the clip member 13 and the inner peripheral edge of the annular body 11 (see FIG. 3) is reduced so that one side of the furnace body 1 in the furnace length direction is reduced. Can be prevented.
[0013]
Reference numeral 20 denotes an opening / closing device for the tap hole 5, which reciprocates the door 22 guided by the guide frames 21 and 21 by an air cylinder 23. The guide frames 21 and 21 and the air cylinder 23 are two It is mounted on a support 24 mounted between the connecting members 12.
[0014]
Reference numeral 30 denotes an opening / closing device for the port 4 for swingably driving a door 33 attached to the support shaft 31 via an arm 32 via a lever 35 fixed to the support shaft 31 by an air cylinder 34. However, the support shaft 31 and the air cylinder 34 are attached to the annular bodies 11, 11 directly or via the support 36, respectively.
[0015]
The furnace body 1 with the frame body 10 is rotatable with the center axis P of the furnace body 1 oriented in the horizontal direction and the lower outer peripheral surface of each annular body 11 of the frame body 10 by a roller 54 shown in FIG. A mixed iron furnace having a furnace body 1 that is tilt-driven by connecting a piston rod (or a rack that meshes with a pinion) of a hydraulic cylinder (not shown) to an arm 15 that is supported and protrudes from an annular body 11 at the center. Constitute.
[0016]
In this mixed iron furnace, the molten iron charged into the furnace body 1 from the receiving port 4 is additionally charged with scrap from the receiving port 4 as necessary, and an electromagnetic heating device (not shown) attached to the furnace body 1. The hot metal is heated to maintain the hot metal at a predetermined temperature, and when necessary, the furnace body 1 is tilted to perform tapping from the tap hole 5. At this time, the furnace body 1 is held by the high-temperature hot metal holding. Even if it thermally expands, the steel shell 2 of the furnace body 1 and the cage-shaped frame 10 are only slidably connected in the furnace length direction by the clip members 13 and 14 and are fixed to each other by welding. Therefore, cracks can be avoided in the welded portion between the iron shell and the ring or the furnace legs of the conventional mixed iron furnace, and even if the furnace body 1 expands and contracts in the furnace length direction in the furnace length direction, No excessive stress is generated in each part.
[0017]
Further, the temperature of the frame body 10 not welded to the steel shell 2 is smaller than that of the steel shell 2, and the displacement of the annular body 11 and the roller 54 in the furnace length direction due to thermal expansion is suppressed to a small value. If the inspection corridor is welded and attached to the frame 10, peeling off or falling off of the welded portion of the corridor can be prevented.
[0018]
Further, the opening / closing device 20 for the tap hole 5 and the opening / closing device 30 for the receiving hole 4 are both supported by the frame body 10 whose temperature rise is smaller and whose rigidity is larger than that of the iron shell 2, and the iron shell 2 which is liable to generate thermal distortion. Therefore, even if the temperature of the furnace body 1 rises and the thermal expansion does not cause a large twist in each part of the switchgear, the opening and closing operation can be performed smoothly without any trouble. In addition, with respect to the expansion and contraction of the furnace body 1 in the furnace length direction, incomplete closing of the opening can be avoided by giving a margin to the width dimension of the doors 22 and 33 in the furnace length direction.
[0019]
In the above example, the annular body 11 of the frame 1 is supported by the roller segment type rollers 54. However, the furnace body 1 is eccentric from the center axis P by the rollers 58 shown in FIG. In the case where the auxiliary furnace leg is rotatably supported around Q, the auxiliary furnace leg 16 shown by a chain line in FIG. 2 is fixed to the lower outer peripheral portion of the annular body 11, and the auxiliary furnace leg 16 is rotatably supported by the roller 58. A case where the annular body 11 is rotatably supported by a roller via a member attached to the annular body 11 as described above is also included in the present invention.
[0020]
The present invention is not limited to the above examples. For example, the specific shape and constituent material of the cage 10 and the shape and arrangement of the clip members 13 and 14 (for example, only between the annular body 11 and the steel shell 2) The clip member 13 is provided on the other side). In addition, the present invention can be widely applied to various rotary furnaces that require heating of the furnace body, such as the above-mentioned conventional melting furnaces for metal materials and rotary melting kilns, in addition to the above-mentioned mixed iron furnace.
[0021]
【The invention's effect】
As described above, according to the present invention, since the furnace body is housed in the cage-shaped frame so as to be slidable in the furnace length direction and the annular body supported by the rollers is not welded to the steel shell of the furnace body, Damage to the conventional ring or the weld between the furnace legs and the furnace body due to the thermal expansion of the furnace body is avoided, and displacement of the annular body portion and the rollers in the furnace length direction is also suppressed to a small amount.
[0022]
According to the second aspect of the present invention, in addition to the above effects, the opening / closing device for opening / closing the opening provided in the body of the furnace body is a cage-shaped frame body having a small temperature rise and accompanying thermal expansion and thermal distortion. , The opening and closing operation of each part of the opening and closing device does not occur even when the temperature of the furnace body rises, and the opening and closing operation can be performed without any trouble without damaging the members.
[Brief description of the drawings]
FIG. 1 is a perspective view of a furnace body part of a mixed iron furnace showing an example of an embodiment of the present invention.
FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 3 is a sectional view taken along line BB of FIG. 1;
FIG. 4 is a sectional view taken along line CC of FIG. 1;
FIG. 5 is a sectional view taken along line DD of FIG. 1;
FIG. 6 is a side view showing an example of a conventional mixed iron furnace.
FIG. 7 is a perspective view of a furnace body part of the mixed iron furnace of FIG.
FIG. 8 is a side view showing another example of the conventional mixed iron furnace.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Furnace body, 2 ... Iron shell, 4 ... Tap hole, 5 ... Tap hole, 10 ... Cage-shaped frame, 11 ... Annular body, 12 ... Connecting material, 13 ... Clip member, 14 ... Clip member, 16 ... Auxiliary furnace legs, 20 ... Opening / closing device, 22 ... Door, 23 ... Air cylinder, 30 ... Opening / closing device, 33 ... Door, 34 ... Air cylinder, 54 ... Roller, 58 ... Roller.

Claims (2)

In a rotary furnace in which a cylindrical furnace body is rotatably supported in a horizontal state, a cage-shaped frame in which a plurality of annular bodies to which the outer periphery of the furnace body is fitted is fixedly connected by a connecting member oriented in the furnace length direction. The furnace body is housed in a body, and a clip member for slidably connecting the steel shell of the furnace body and the frame body in a furnace length direction is provided, and the annular body is rotatably supported by rollers. Rotary furnace characterized. 2. The rotary furnace according to claim 1, wherein an opening / closing device for opening and closing a material charging and tapping opening provided in a body portion of the furnace body is supported by the cage frame.

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