JP2005048226A - Mechanical stirring type desulfurization apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mechanical stirring type desulfurization apparatus which moves up and down in a state of supporting a main body of a stirrer with a fixing frame even during desulfurization treatment, inhibits propagation of the vibration to the whole mechanical stirring type desulfurization apparatus through absorbing a certain degree of vibration, further infrequently causes trouble, and besides is easily inspected and maintained. <P>SOLUTION: The mechanical stirring type desulfurization apparatus 1 comprises the main body of the stirrer 2 provided with an impeller 12 which is immersed in molten pig iron 28 and stirs the molten pig iron while rotating, and with a driving machine 7 for rotating the impeller; and the fixing frame 3 for guiding the up-and-down movement of the main body of the stirrer. The main body of the stirrer moves up and down while contacting with the fixing frame through a plurality of guide rollers 13 and 15. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a mechanical stirring type desulfurization apparatus in which a stirring bar at the lower end of the hot metal is immersed in hot metal, and the stirring bar is rotated to mix hot metal and a desulfurizing agent to perform desulfurization treatment of the hot metal.

  When manufacturing steel from hot metal, sulfur in the steel significantly deteriorates the mechanical properties of the steel, so desulfurization treatment is performed at the hot metal stage where desulfurization reaction efficiency is high in order to reduce the sulfur content in the steel. Has been. This desulfurization treatment is performed by a gas stirring method by blowing an inert gas such as Ar gas, or by rotating an impeller (also referred to as “rotating blade” or “rotating blade”) or a stirrer (also referred to as “stirring body”). A method of adding a desulfurizing agent to the hot metal being stirred by a mechanical stirring method using a stir bar is common, and in particular, even when an inexpensive CaO-based desulfurizing agent is used, high desulfurization efficiency is obtained. In recent years, a desulfurization method using a mechanical stirring method has become mainstream.

  As an example of this mechanical stirring type desulfurization apparatus, the mechanical stirring type desulfurization apparatus disclosed in Patent Document 1 is shown in FIG. As shown in FIG. 5, the mechanical agitation desulfurization apparatus 1 guides the agitator body 2 that moves up and down via a wire 23 driven by an elevator (not shown) such as a crane and a winch, and the ascending and descending of the agitator body 2. For this purpose, the stirrer main body 2 is equipped with a drive unit 7, a speed reducer 8, a rotating shaft 10, an impeller 12, and the like. It consists of a moving gantry 6. The impeller 12 at the lower end of the stirrer body 2 is immersed in the hot metal 28 in the hot metal ladle 27 and rotated to perform desulfurization treatment of the hot metal 27. The stirrer main body 2 is retracted upward along the fixed frame 3 by the wire 23 or descends toward the hot metal ladle 27.

During the desulfurization process, the agitator body 2 vibrates strongly with the rotation of the impeller 12. Therefore, in order to prevent this vibration, in Patent Document 1, a plurality of hydraulic cylinders 24 connected to the hydraulic device 25 and the hydraulic piping 26 are provided. It is installed on the fixed frame 3 and the hydraulic cylinder 24 is driven to press the tip of the piston rod of the hydraulic cylinder 24 against the movable frame 6, thereby preventing the vibration. Patent Document 1 also discloses a mechanical stirring type desulfurization apparatus in which a hydraulic cylinder 24 is installed on the stirrer main body 2 side and vibration is prevented by pressing the tip of the piston rod against the fixed frame 3.
JP 2002-363627 A

  As described above, conventionally, as a countermeasure for preventing vibration of the stirrer body in the mechanical stirring type desulfurization apparatus, a pressurizer such as a hydraulic cylinder, an air cylinder, a conductive cylinder is used, and the piston rod of the pressurizer is pressed against the stirrer body or the fixed frame. In order to prevent vibration, a method has been used.

  However, this vibration prevention method has the following problems. That is, since the stirrer body and the fixed frame are always restrained by a force of a predetermined value or more by the pressurizer, when the stirrer body is moved up and down, the restraining force by the pressurizer must be released each time. For the purpose of improving the desulfurization efficiency, it has been virtually impossible to perform the desulfurization process while raising and lowering the agitator body.

  In addition, the main body of the stirrer and the fixed frame are integrally restrained by hydraulic pressure, compressed air pressure, etc., so that the vibration propagates not only to the mechanical stirring type desulfurization device but also to the entire building where the mechanical stirring type desulfurization device is installed. In the worst case, there was a risk of damage to the mechanical stirring desulfurizer and the building.

  Furthermore, since all the force resulting from the vibration is applied to the piston rod of the pressurizer, the piston packing is easily damaged, and a trouble has occurred that the stirrer body cannot be fixed suddenly during the desulfurization process. In addition, when hydraulic pressure or compressed air is used, it is easy to cause damage and breakage of utility supply incidental equipment such as pressurizers and piping hoses, and it is necessary to constantly monitor the occurrence of oil leaks and compressed air leaks. there were.

  The present invention has been made in view of the above circumstances, and the object of the present invention is that it is possible to move up and down while the agitator body is supported by a fixed frame even during the desulfurization process, and to a certain degree of vibration. To provide a mechanical stirring type desulfurization device that can suppress the propagation of vibration to the entire mechanical stirring type desulfurization device and that is less likely to cause trouble and that is easy to maintain and maintain. It is.

  A mechanical stirring type desulfurization apparatus according to a first invention for solving the above problems includes a stirrer body that includes a stirrer that is immersed in the hot metal and rotates to stir the hot metal, and a drive unit that rotates the stirrer. A mechanical agitation desulfurization apparatus comprising a fixed frame for guiding the raising and lowering of the agitator body, wherein the agitator body is raised and lowered while being in contact with the fixed frame via a plurality of guide rollers. To do.

  In the mechanical stirring type desulfurization apparatus according to a second aspect of the present invention, in the first aspect, the guide roller is in contact with a rail installed on the fixed frame.

  A mechanical agitation desulfurization apparatus according to a third aspect of the invention is a stirrer body that includes a stirrer that is immersed in the hot metal and rotates to stir the hot metal and a drive unit that rotates the stirrer, and guides the elevation of the stirrer body. A plurality of guide rollers installed at different positions in the rotation direction of the stirrer body and different positions in the vertical direction of the stirrer body. On the other hand, the fixed frame is provided with rails facing the respective guide rollers, and the stirrer body moves up and down while contacting the guide rollers with the rails. .

  A mechanical stirring desulfurization apparatus according to a fourth aspect of the invention is a stirrer body provided with a stirrer that is immersed in the hot metal and rotates to stir the hot metal, and a drive unit that rotates the stirrer, and guides the raising and lowering of the stirrer body. A mechanical agitation desulfurization apparatus comprising: a stirrer body, wherein the stirrer body has a substantially right-angled outer shell in a horizontal section, and the stirrer body has an axial direction orthogonal to the stirrer body. A pair of guide rollers is installed in at least two positions in the vertical direction of the stirrer main body, with four pairs in the horizontal direction across the apex of the right-angled rectangular cross section of the stirrer main body, for a total of 8 sets or more. On the other hand, the fixed frame is provided with rails facing the respective guide rollers, and the stirrer body moves up and down while contacting the guide rollers with the rails. Than it is.

  The mechanical stirring desulfurization apparatus according to a fifth aspect of the present invention is the mechanical stirring desulfurization device according to any one of the second to fourth aspects, wherein at least one of the guide rollers is constantly pressed against the rail side by a spring. It is characterized by being.

  The mechanical stirring desulfurization apparatus according to a sixth aspect of the present invention is the mechanical stirring desulfurization apparatus according to any one of the second to fourth aspects, wherein at least one of the guide rollers is any of a hydraulic cylinder, an air cylinder, and an electric cylinder. In this way, the rail side is always subjected to a pressing force.

  According to the present invention, since the agitator body is supported by the fixed frame via the guide roller, the agitator body is not restrained by the fixed frame, and therefore the agitator body is raised and lowered even during the desulfurization process. Therefore, desulfurization treatment with increased hot metal stirring strength is possible. Further, when a disc spring is used as the pressing force of the guide roller, the disc spring can absorb the vibration of the stirrer body to some extent, and the vibration propagation to the fixed frame can be suppressed. Because there is no need to install a hydraulic device or hydraulic piping, it is possible to perform desulfurization stably without any trouble or damage to utility supply incidental equipment such as pressurizers and piping hoses. .

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 1 to 3 are diagrams showing an embodiment of the present invention. FIG. 1 is a schematic side view of a mechanical stirring desulfurization apparatus according to the present invention, and FIG. 2 is a mechanical stirring desulfurization according to the present invention. FIG. 3 is a schematic enlarged view of the roller pressing mechanism shown in FIGS. 1 and 2.

  As shown in FIGS. 1 and 2, the mechanical stirring desulfurization apparatus 1 according to the present invention includes an impeller 12 as a stirrer at the lower end, and the impeller 12 is accommodated in a hot metal holding container such as a hot metal ladle 27. Mainly a stirrer body 2 that moves up and down to immerse it in, and a fixed frame 3 that is composed of four standing H-shaped steels and a steel material that connects the H-shaped steels to guide the lifting and lowering of the stirrer body 2. It is configured as a device. A pulley 22 is installed on the upper portion of the agitator main body 2, and a wire 23 driven by an elevator (not shown) such as a crane or a winch is installed on the pulley 22 to start the elevator such as a crane or a winch. Thus, the agitator body 2 is moved up and down.

  The stirrer body 2 includes a drive unit 7 for rotating the impeller 12, a speed reducer 8 that decelerates the rotational speed transmitted from the drive unit 7 and transmits it to the rotary shaft 10, a rotary shaft 10 attached to the speed reducer 8, The rotating shaft 10 and the impeller shaft 12 </ b> A are connected to each other by a connecting portion 11, and the movable mount 6 including the impeller 12 installed at the tip of the impeller shaft 12 </ b> A. It is held on the movable gantry 6.

  In the stirrer body 2 whose outer section of the horizontal section is a right-angled quadrangle, a pair of guide rollers 13 and guide rollers 15 that are orthogonal to the axial direction across each vertex of the right-angled square section, Four sets are arranged in the rotating direction of the stirrer main body 2, that is, in the horizontal direction, and two in the vertical direction of the stirrer main body 2. The guide roller 13 is fixed and arranged on the moving gantry 6 by a bearing 21 installed on the moving gantry 6, while the guide roller 15 is held by a roller pressing mechanism 14 installed on the moving gantry 6. Thus, the structure is movable in parallel to the outer surface of the stirrer body 2. The guide roller 13 is fixed to the movable gantry 6, but has a structure capable of adjusting the fixed position.

  Four rails 4 whose horizontal cross section is a right triangle are attached to the fixed frame 3 by rail support arms 5 at positions facing the guide rollers 13 and 15. The rail 4 and the guide roller 13 and the guide roller 15 are in contact with each other on two orthogonal surfaces of the rail 4, and the contact surfaces are smooth, and the guide roller 13 and the guide roller 15 rotate while being in contact with the rail 4. It is like that.

  As shown in FIG. 3, the roller pressing mechanism 14 includes a case 19 attached to the movable frame 6 by bolts (not shown), one end thereof housed in the case 19, and the other end protruding from the case 19. A roller support 17 that is branched into two and slidable in the case 19, a bearing 16 that is installed at the two branches of the roller support 17, and a guide that is supported by the bearing 16 via the bearing 18. The roller 15 and a plurality of disc springs 20 accommodated in the case 19 and in contact with the roller support 17 are configured such that the disc support 20 exerts a force so that the roller support 17 always protrudes from the case 19. is recieving. Thereby, the guide roller 15 held by the roller support 17 also constantly receives a force in the direction opposite to the case 19 side. In FIG. 3, there is a gap on the roller support 17 side in the case 19, but this is because the guide roller 15 is in contact with the rail 4, and the disc spring 20 is contracted by the reaction force from the rail 4. This is because the state is shown.

  In this way, the stirrer body 2 is held by the fixed frame 3 when the pair of guide rollers 13 and the guide roller 15 are always in contact with each other with the rail 4 interposed therebetween. In this case, since the guide roller 15 can be moved by the disc spring 20, there is a degree of freedom in the installation range of the movable frame 6, but the guide roller 13 is fixed to the movable frame 6, so that the guide roller 15 is in a position in contact with the rail 4. A fixed arrangement is preferred. However, even if a gap of about several millimeters is generated between the guide roller 13 and the rail 4, the stirrer body 2 can be held on the fixed frame 3 as long as the guide roller 15 is in contact with the rail 4.

  The weight of the agitator main body 2 is supported by an elevator such as a crane or a winch, and the guide roller 13 and the guide roller 15 can be designed so that a force sufficient to prevent vibration caused by the rotation of the impeller 12 acts. it can. Even if the stirrer main body 2 vibrates, the disc spring 20 absorbs a certain amount of vibration, so that propagation of vibration to the fixed frame 3 can be suppressed.

  Since the guide roller 13 and the guide roller 15 rotate while being in contact with the rail 4, the guide roller 15 can be kept pressed against the rail 4 when the agitator body 2 is raised and lowered. That is, the stirrer body 2 can be raised and lowered within the fixed frame 3 while the guide roller 13 and the guide roller 15 remain in the above state.

  In FIG.1 and FIG.2, the guide roller hold | maintained at the roller pressing mechanism 14 among a pair of guide rollers arrange | positioned on both sides of the vertex of a right-angled square cross section is only one of the rotation direction upstream of the stirrer main body 2. However, both guide rollers may be held by the roller pressing mechanism 14. Moreover, although a pair of guide roller is arrange | positioned four places in the horizontal direction, if it arrange | positions at least two places on the diagonal of a right-angled square cross section, the stirrer main body 2 can be hold | maintained. Furthermore, although arrange | positioned in two places in the perpendicular direction, you may arrange | position in two or more places.

  In this case, since the stirrer body 2 is supported by the guide roller, from the viewpoint of suppressing the vibration of the stirrer body 2, the upper end of the rotating shaft 10 that rotates the impeller 12, that is, the lower end of the speed reducer 8 to the tip of the impeller 12. According to the length, it is preferable to appropriately adjust the interval between the highest guide roller and the lowest guide roller in the vertical direction so that the vibration of the stirrer body 2 is reduced. If the vibration of the agitator body 2 is reduced, the life of the bearing 9 is extended, which contributes to cost reduction. The longer the distance between the upper and lower guide rollers, the more the vibration of the agitator body 2 is suppressed.

  Using the mechanical stirring desulfurization apparatus 1 according to the present invention configured as described above, the desulfurization treatment of the hot metal 28 is performed as follows.

  First, the hot metal 28 discharged from the blast furnace is received in a hot metal holding container, for example, a hot metal ladle 27, and this hot metal ladle 27 is mounted on a transport carriage 29 and conveyed directly under the mechanical stirring desulfurization apparatus 1. At this time, the stirrer body 2 is supported in a state of being retracted upward along the fixed frame 3 by an elevator such as a crane or a winch. Next, the stirrer body 2 is lowered to immerse the impeller 12 in the hot metal 28 in the hot metal ladle 27, and the descent is stopped when the impeller 12 reaches a predetermined immersion depth. At this time, the impeller 12 may be rotated in advance or may be rotated after being immersed. Thereafter, a desulfurizing agent is added into the hot metal ladle 27, and the rotational speed of the impeller 12 is appropriately adjusted to perform a desulfurization treatment. When the desulfurization process is completed, the rotation of the impeller 12 is stopped, and the agitator body 2 is lifted upward to complete the desulfurization process. After the desulfurization treatment, the hot metal ladle 27 is carried out to the hot metal pretreatment facility when the converter or the hot metal pretreatment of the next step is further performed.

  As the desulfurizing agent, CaO-based, soda-based, metallic Mg-based, or the like can be used, but it is preferable to use an inexpensive CaO-based desulfurizing agent. Further, the stirring strength of the hot metal 28 can be increased by raising and lowering the stirrer body 2 during the desulfurization process. Furthermore, before desulfurizing the hot metal 28, the hot metal 28 may be subjected to desiliconization treatment or dephosphorization treatment, and the slag produced by the desiliconization treatment or dephosphorization treatment may be gradually reduced. It does not matter if it is not removed, but it is desirable to gradually reduce it from the viewpoint of increasing the desulfurization efficiency.

  As described above, in the mechanical stirring type desulfurization apparatus 1 according to the present invention having the above-described configuration, it is possible to perform the desulfurization process while raising and lowering the stirrer body 2, and since the disc spring 20 is used, the stirrer body 2 can be absorbed to some extent, and it is possible to suppress the propagation of vibration to the fixed frame 3, and further, it is necessary to install a hydraulic device or a hydraulic pipe for supporting the agitator body 2. Therefore, there is no trouble of the utility supply incidental equipment such as a pressurizing machine and a piping hose, and there is no trouble of broken holes, and it is possible to perform the desulfurization process stably.

  In the roller pressing mechanism 14, hydraulic pressure, compressed air pressure, electric power, or the like can be used instead of the disc spring 20. FIG. 4 is a schematic view showing an example of a roller pressing mechanism 14 using hydraulic pressure, in which a hydraulic cylinder 30 is attached to the movable frame 6 by bolts (not shown), and the piston rod of the hydraulic cylinder 30 is a roller. It also serves as the support 17. The hydraulic cylinder 30 is provided with supply / discharge oil ports 31, 32, and hydraulic pressure is supplied to the hydraulic cylinder 30 via the supply / discharge oil ports 31, 32 from a hydraulic device (not shown) installed on the movable frame 6. It is like that. Other portions are the same as those of the roller pressing mechanism 14 shown in FIG. 3, and are denoted by the same reference numerals.

  The present invention is not limited to the above description, and various modifications can be made. For example, although the horizontal section of the stirrer body 2 is a right-angled quadrangle, it may be a triangle, a pentagon or more polygon, or a circle. Furthermore, the detailed structure of the roller pressing mechanism 14 may be any structure as long as the guide roller can be pressed against the rail 4 side.

It is a figure which shows embodiment of this invention, Comprising: It is a schematic side view of the mechanical stirring type desulfurization apparatus which concerns on this invention. It is a figure which shows embodiment of this invention, Comprising: It is a schematic plan view of the mechanical stirring type desulfurization apparatus which concerns on this invention. It is a figure which shows embodiment of this invention, Comprising: It is a schematic enlarged view of the roller pressing mechanism shown in FIG.1 and FIG.2. It is a figure which shows embodiment of this invention, Comprising: It is the schematic which shows the example of the roller pressing mechanism using hydraulic pressure. It is the schematic of the conventional mechanical stirring type desulfurization apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mechanical stirring type desulfurization apparatus 2 Stirrer main body 3 Fixed frame 4 Rail 5 Rail support arm 6 Moving mount 7 Drive machine 8 Reducer 9 Bearing bearing 10 Rotating shaft 11 Connection part 12 Impeller 12A Impeller shaft 13 Guide roller 14 Roller pressing mechanism DESCRIPTION OF SYMBOLS 15 Guide roller 16 Bearing 17 Roller support 18 Bearing 19 Case 20 Belleville spring 21 Bearing 22 Pulley 23 Wire 24 Hydraulic cylinder 25 Hydraulic device 26 Hydraulic piping 27 Hot metal ladle 28 Hot metal 29 Conveying cart 30 Hydraulic cylinder 31 Supply / discharge port 32 Supply / discharge Oil mouth

Claims (6)

  A mechanical stirring desulfurization apparatus comprising: a stirrer that is immersed in hot metal and rotates to stir the hot metal, and a stirrer body that includes a drive unit that rotates the stirrer; and a fixed frame that guides the raising and lowering of the stirrer body. The mechanical stirrer desulfurization apparatus is characterized in that the stirrer body moves up and down while contacting the fixed frame via a plurality of guide rollers.   The mechanical stirring desulfurization apparatus according to claim 1, wherein the guide roller is in contact with a rail installed on the fixed frame.   A mechanical stirring desulfurization apparatus comprising: a stirrer that is immersed in hot metal and rotates to stir the hot metal, and a stirrer body that includes a drive unit that rotates the stirrer; and a fixed frame that guides the raising and lowering of the stirrer body. The stirrer main body is provided with a plurality of guide rollers at different positions in the rotation direction of the stirrer main body and different positions in the vertical direction of the stirrer main body. A rail that faces the guide roller is installed, and the stirrer main body moves up and down while bringing the guide roller into contact with the rail.   A mechanical stirring desulfurization apparatus comprising: a stirrer that is immersed in hot metal and rotates to stir the hot metal, and a stirrer body that includes a drive unit that rotates the stirrer; and a fixed frame that guides the raising and lowering of the stirrer body. In the stirrer body, the outer shell of the horizontal cross section is substantially a right-angled quadrangle, and the stirrer body has a pair of guide rollers having a pair of guide rollers orthogonal to the axial direction. At least two positions in the vertical direction of the main body, four sets in the horizontal direction across the apex of the right-angled rectangular cross section of the stirrer main body, a total of eight or more sets are installed, while the fixed frame has each guide roller A mechanical agitation desulfurization apparatus, wherein the agitator body moves up and down while the guide roller is in contact with the rail.   The mechanical stirring type according to any one of claims 2 to 4, wherein at least one of the guide rollers is constantly pressed against the rail by a spring. Desulfurization equipment.   The at least one guide roller among the guide rollers is constantly pressed against the rail side by any one of a hydraulic cylinder, an air cylinder, and an electric cylinder. 4. The mechanical stirring desulfurization apparatus according to any one of 4 above.

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