JP6584963B2 - Damper - Google Patents

Description

  The present invention relates to a damper, and more specifically, for example, a surge hopper that is a metal smelting facility such as ferronickel smelting, a damper shaft, and a flapper that rotates around the damper shaft And a damper that drops an object placed on the flapper by opening / closing control by rotation of the flapper.

  In ferronickel smelting, nickel oxide ore with a nickel quality of about 2% by weight (hereinafter simply referred to as “ore”) is used as a raw material, through steps such as preliminary drying, drying and partial reduction, reduction melting, desulfurization, casting, Produces ferronickel with a nickel grade of about 20% by weight.

  In the smelting of ferronickel, the ore is melted in an electric furnace or the like, which is a reduction furnace, in the reduction melting step of reducing and melting the ore obtained after being dried and partially reduced. If the ore contains crystal water, it will cause a steam explosion in the electric furnace.

  Therefore, in the drying and partial reduction steps, which are steps prior to the reduction melting step, the rotary crystal kiln is used to decompose and remove crystal water in the ore by setting the ore temperature to, for example, 800 ° C. or higher. . From the rotary kiln, ore from which crystal water of about 800 ° C. or higher is removed (hereinafter referred to as “calcined ore”) is obtained.

  Here, the flow until the calcined ore obtained in the rotary kiln is charged into the electric furnace will be described with reference to the schematic diagram of FIG.

  First, the sinter obtained in the rotary kiln 2 is temporarily stored in the surge hopper 1. The smelting mine stored in the surge hopper 1 is opened after the damper of the surge hopper 1 provided at the lower end of the surge hopper 1 so that the hopper (hereinafter referred to as “burning hopper”) provided after the surge hopper 1 is opened. The damper provided in the surge hopper 1 is closed when the sinter charged in the sinter hopper reaches a predetermined weight. Then, the damper of the sinter hopper is opened, and the sinter of a predetermined weight stored in the sinter hopper is charged into the sinter container 3.

  After the mine container 3 is transported to a position where a crane (hereinafter referred to as “furnace crane”) 5 stands by using a transport carriage 4, the mine container 3 is lifted by the furnace crane 5, and the upper part of the electric furnace 7. Is loaded into a hopper 6 (hereinafter referred to as “baking mine”) provided in the factory. Then, the sinter charged in the sinter bin 6 is charged into the electric furnace 7.

  As described above, when transferring the sinter from the rotary kiln 2 to the electric furnace 7, discharge control of the sinter is performed by the surge hopper 1, and the damper used in the surge hopper 1 is important. Plays an important role. The damper used in the surge hopper 1 has a flapper-type structure. The flapper is opened and closed by moving the cylinder installed outside the surge hopper 1 and rotating it around the damper axis. It is a mechanism to do.

  When the flapper is closed, the damper used for the surge hopper 1 has a maximum of several tons of mine. Therefore, the damper needs to be able to withstand the weight of the sinter.

  Further, the damper shaft and the flapper constituting the damper of the surge hopper 1 must have a structure capable of withstanding the heat of the calcination at approximately 800 ° C. For example, if the damper shaft does not have a structure that can withstand the heat of high-temperature sinter, the damper shaft is deformed due to the heat of the sinter. As a problem when the damper shaft is deformed, it may be called a castable refractory (unshaped refractory) provided around the damper because the damper shaft is displaced. 3), the opening / closing trouble such that the damper cannot be opened / closed, half-opened or half-closed occurs. Further, when the damper shaft comes into contact with the caster, the caster falls off, and the slag hopper 8 may be deformed or broken by being directly exposed to the high-temperature slag. .

  Another problem is that the deformation of the damper shaft places a load on the gland packing 17 and the gland retainer 18 of the gland box 16 formed around the damper shaft, and the gland packing 17 and the gland retainer 18 are damaged. (See FIG. 4 for configuration). If the gland packing 17 or the gland retainer 18 is damaged, the rotation of the damper shaft is hindered, resulting in an abnormal opening / closing of the damper, and problems such as high temperature gas or dust in the surge hopper 1 being ejected from the broken gland packing 17 are caused. .

  In order to prevent such a deformation of the damper shaft due to the heat of the high-temperature sinter, for example, it is conceivable to cool the damper shaft using cooling water. Thus, by cooling the damper shaft, deformation of the damper shaft can be suppressed, and problems such as open / close failures can be prevented.

  However, even if the deformation of the damper shaft can be suppressed, the flapper that constitutes the damper is also affected by the heat of the sinter, so thermal expansion may occur, and the observed flapper is in the axial direction of the damper shaft. There is a problem that it shifts to the left and right along. Then, an appropriate opening / closing operation is not performed in the damper, which causes a trouble in transporting the mine.

  For this reason, for example, with respect to dampers used in surge hoppers where smelting ore is temporarily stored in ferronickel smelting, the flapper moves left and right along the axial direction of the damper shaft due to the influence of heat, etc. There is a need for a technique that prevents the shift and allows the opening / closing operation to be performed satisfactorily.

  For example, Patent Document 1 discloses a technique related to an in-furnace carrier roll provided inside a resin drying furnace or the like that dries a resin applied to the surface of a steel sheet. A technology is disclosed for a roll for moving a slab, a water passage is formed in the central portion of the shaft, the outer cylinder is rotatable, and the steel plate is not damaged. However, this technique cannot be directly applied to a damper such as a surge hopper that temporarily stores a burned ore obtained from a rotary kiln used in ferronickel smelting, for example. Further, Patent Document 1 describes an application temperature of “widely applicable to a low-speed conveyance type heating furnace of 600 ° C. or less”. For example, for an object having a temperature exceeding 600 ° C. such as sinter. And it is not enough to withstand.

JP 2005-053612 A

  The present invention has been proposed in view of such a situation. For example, in a damper used in a surge hopper or the like, the flapper constituting the damper is affected by heat or the like along the axial direction of the damper shaft. It is an object of the present invention to provide a damper that can prevent the slippage and can perform a favorable opening / closing operation.

  The inventors of the present invention have made extensive studies in order to solve the above-described problems. As a result, in a damper having a damper shaft and a flapper that rotates about the damper shaft, a plurality of ear portions having through holes are provided at the end portions of the flapper, and the damper shafts are provided in the through holes of all the ear portions. The flapper can be fixed integrally with the flapper, and a fixed stopper can be fixedly installed on the exposed part of the damper shaft between the adjacent ears. As a result, the present invention has been completed.

  (1) A first aspect of the present invention includes a damper shaft and a flapper that rotates about the damper shaft, and controls the opening and closing of an object placed on the flapper by rotating the flapper. The end of the flapper is provided with a plurality of ears having through holes, and the damper shafts are passed through the through holes of all the ears. And a stopper of a plate-like member having a length substantially the same as the length of the exposed portion in the axial direction is fixedly installed on the exposed portion of the damper shaft between the adjacent ear portions. It is a damper characterized by.

  (2) According to a second aspect of the present invention, in the first aspect, the stopper is a collar in which a plate-like member having a length substantially the same as the axial length of the exposed portion is formed into a semi-cylindrical shape. It is.

  (3) The third invention of the present invention is the damper according to the first or second invention, wherein the collar is fixed by plug welding to the damper shaft.

  (4) According to a fourth aspect of the present invention, in any one of the first to third aspects, the damper shaft is provided with a key groove, and the damper is disposed inside the ear portion of the flapper. A key groove is provided at a position corresponding to the key groove of the damper shaft when the shaft and the flapper are integrated, and the damper shaft and the flapper are fitted with a key in each key groove. It is a damper fixed by.

  (5) According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the damper shaft is made of a columnar steel material, and the columnar steel material has a length of the steel material. When a cylindrical water passage having the same central axis as the steel material is provided continuously in the axial direction, the diameter of the steel material is D1, and the diameter of the circular cross section of the water passage is D2. , 0.2 × D1 ≦ D2 ≦ 0.55 × D1.

  (6) A sixth invention of the present invention is the damper according to the fifth invention, wherein in the damper shaft, female threads to which a cooling water supply pipe is connected are cut at both ends of the water passage. .

  (7) A seventh invention of the present invention is the damper according to the fifth or sixth invention, wherein the steel material of the steel material is SUS310S in the damper shaft.

  (8) An eighth invention of the present invention is the damper according to any one of the fifth to seventh inventions, wherein the diameter D1 of the steel material is 100 mm or more and 150 mm or less in the damper shaft.

  (9) A ninth invention of the present invention is the damper used in the surge hopper for storing the sinter produced by ferronickel smelting in either the first or eighth invention.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent effectively that the flapper which comprises a damper shifts right and left along a damper axis | shaft by the influence of a heat | fever, etc., and can perform favorable opening / closing operation | movement.

It is a figure for demonstrating the flow until the calcined ore obtained with the rotary kiln is inserted into an electric furnace. It is a schematic sectional drawing of the sinter hopper and the sinter hopper provided in the lower end of the surge hopper. It is the schematic sectional drawing which expanded the location of the damper in a surge hopper. It is the schematic which shows the ground part of a damper axis | shaft. It is an upper surface schematic diagram which shows the structure of a damper. It is sectional drawing of a damper. It is a schematic diagram for demonstrating the structure of a damper shaft. It is a schematic diagram which shows the structure (another structure) of a damper shaft.

Hereinafter, specific embodiments of the present invention will be described in detail in the following order with reference to the drawings. In addition, this invention is not limited to the following embodiment, A various change is possible in the range which does not change the summary of this invention.
1. 1. Outline of the present invention 2. Configuration of surge hopper and outline of slag discharge processing in surge hopper About the damper Example

<< 1. Outline of the present invention >>
A damper according to the present invention includes a damper shaft and a flapper that rotates around the damper shaft. It is dropped by the opening / closing control by turning.

  Specifically, in the damper according to the present invention, a plurality of ear portions having through holes are provided at the end portion of the flapper, and the damper shafts are passed through the damper shafts through the through holes of all the plurality of ear portions. Is integrally fixed. In this damper, a stopper of a plate-like member having a length substantially the same as the length in the axial direction of the exposed portion is fixedly installed at a portion of the exposed damper shaft between adjacent ear portions. It is a feature. Preferably, a collar having a plate-like member in a semi-cylindrical shape is fixedly installed as the stopper.

  Here, as the damper, for example, it is used in a surge hopper that stores the smelted ore discharged from the rotary kiln (see FIG. 1) after being subjected to a drying process and a partial reduction process on the ore in ferronickel smelting. Can be mentioned.

  For example, a damper used in a surge hopper of a ferronickel smelting operation facility is intended for a hot sinter of about 800 ° C. to 900 ° C., and the sinter is placed on a flapper. By periodically performing opening / closing control by rotating the flapper around the damper shaft, an operation of dropping the sinter placed on the flapper to the lower part is performed. Therefore, the damper used for such a metal smelting operation facility is strongly influenced by the heat of the high-temperature object.

  Specifically, in the case of a damper whose target is a high-temperature sinter, the fixed portion of the flapper with the damper shaft expands due to the heat of the sinter, and the flapper moves along the axial direction of the damper shaft. It may shift to. When such a flapper shift to the left or right occurs, the damper is not properly opened and closed, and a specific amount of mine cannot be properly dropped and transferred to the space provided under the damper.

  In this regard, in the damper according to the present invention, the damper shaft is integrally fixed at the plurality of ear portions having through holes provided at the end portion of the flapper, and a predetermined stopper is fitted between the adjacent ear portions. Since they are fixed, it is possible to effectively prevent the flapper from being displaced along the axial direction of the damper shaft. Specifically, as the stopper, a collar in which a plate-like member having substantially the same length as the axial length of the exposed portion of the damper shaft is formed in a semi-cylindrical shape can be used. As described above, by providing the stopper, it is possible to stably control the opening / closing of the damper, and it is possible to appropriately drop and transfer a specific amount of the object.

  Below, in the case of more detailed explanation of the damper concerning the present invention, the case where it applies to the damper used for the surge hopper used for the operation of ferronickel smelting is explained as an example. The damper according to the present invention is not limited to the one for the surge hopper, and is effectively applied to, for example, a damper used in equipment exposed to high-temperature heat.

≪2. Overview of surge hopper configuration and slag discharge processing in surge hoppers≫
(Configuration of surge hopper using a damper)
First, prior to the description of the damper, a configuration of a surge hopper to which the damper is applied will be briefly described. FIG. 2 is a schematic cross-sectional view of the surge hopper 1 and the sinter hopper 8 provided at the lower end of the surge hopper 1.

  The surge hopper 1 is a facility for storing baked ore. As shown in FIG. 2, the surge hopper 1 has a surge hopper 1A for storing the slag discharged from the rotary kiln, and a slag hopper 8 for charging the sinter with a predetermined amount stored in the surge hopper 1A. And a damper 10 as an opening / closing mechanism.

  The damper 10 has a flapper type structure as shown in FIG. 3, and moves the cylinder 13 installed on the outside of the surge hopper 1, and rotates the damper 10 around the damper shaft 11. Open and close. In addition, as shown in FIG. 3, the caster 15 is provided around the damper 10 as a refractory material.

  Further, the sinter hopper 8 provided subsequently to the lower end of the surge hopper 1 includes, for example, two sinter hopper parts 8a and 8b (hereinafter referred to as “first sinter hopper part 8a”, “second sinter mine”). It is also referred to as a “hopper portion 8b”), and the slag hoppers 8a and 8b are sequentially charged with sinter from the surge hopper 1. In the case of the configuration in which the two sinter hoppers 8a and 8b are provided in this manner, the damper 10 provided in the surge hopper 1 is sequentially charged with the sinter into the respective sinter hoppers 8a and 8b. In order to control this, two dampers 10a and 10b (hereinafter also referred to as “first damper 10a” and “second damper 10b”) are provided so as to correspond to the respective sinter hopper portions 8a and 8b.

  The size of the surge hopper 1 is not particularly limited, but the weight applied to the damper 10, that is, the combined weight of the slag stacked on the damper 10 and the weight of the damper 10 is about 1 to 4 t. It is preferable that the size be such that If the weight is less than 1 t, the amount of sinter that can be temporarily stored in the surge hopper 1 is small, so the frequency of acceptance of the sinter from the surge hopper 1 to the sinter hopper 8, that is, the frequency of opening and closing the damper 10 is It will increase significantly. Therefore, wear of mechanical parts such as a damper shaft 11 and a cylinder 13 described later becomes remarkable. On the other hand, when the weight exceeds 4 t, the weight applied to the damper 10 and the damper shaft 11 increases, and therefore, a design change is required to make the structure resistant to the heat received from the high-temperature sinter or larger weight.

(Outline of firing discharge processing in surge hopper)
Specifically, the smelter temporarily stored in the surge hopper 1A of the surge hopper 1 is disposed inside the surge hopper 1A by, for example, opening one damper 10a (first damper 10a) of the surge hopper 1. The sinter is charged into the first sinter hopper 8a. Then, the weight of the sinter is measured using the load cell 14a provided in the first sinter hopper 8a, and when the measured value reaches a predetermined weight, the first damper 10a of the surge hopper 1 is used. Is closed, and charging of the sinter into the first sinter hopper 8a is stopped. Then, the damper provided in the lower end of the 1st sinter hopper part 8a opens, and the sinter of predetermined weight is discharged | emitted in a sinter container. When the discharge of the sinter into the sinter container is finished, the damper of the first sinter hopper 8a is closed.

  When the first damper 10a is closed and charging of the sinter into the first sinter hopper portion 8a is completed, the other damper 10b (second damper 10b) of the surge hopper 1 is subsequently opened, and the surge The sinter in the hopper part 1A is charged into the second sinter hopper part 8b. In the same manner as the flow described above, the slag charged in the second sinter hopper 8b is measured by the load cell 14b, and the charging is stopped when a predetermined weight of sinter is stored. When the damper provided at the lower end of the second sinter hopper 8b is opened, the sinter is discharged into the sinter container.

  Thus, for example, after the first damper 10a of the surge hopper 1 is opened, the sinter is discharged through the first mine hopper 8a, and then the second damper 10b of the surge hopper 1 is opened. By repeating the operation that the sinter is discharged through the second sinter hopper 8b, the above-described two sinter hoppers 8a and 8b are alternately used, and a predetermined weight of the sinter is sequentially produced. It is discharged into the mine container.

  As described above, the damper 10 of the surge hopper 1 places several tons of sinter, and discharges the sinter sequentially through the sinter hopper 8 by performing predetermined opening and closing control. Therefore, in the damper 10, it is required to discharge the sinter appropriately by efficient and accurate opening / closing control of the flapper 12 based on rotation around the damper shaft 11.

≪3. About damper≫
FIG. 5 is a schematic diagram for explaining the configuration of the damper according to the present invention, as viewed from above. As shown in FIG. 5, the damper 10 includes a damper shaft 11 and a flapper 12 that rotates around the damper shaft 11.

(Basic configuration of damper)
[Damper shaft]
The damper shaft 11 is made of a cylindrical steel material, and is the main structure of the damper 10 for opening and closing the damper 10 body, that is, for opening and closing the flapper 12.

The damper shaft 11 is divided into a central portion 21A and end portions 21B (21B ₁ , 21B ₂ ), and is fixed integrally with the flapper 12 at a predetermined location so that the flapper 12 is positioned at the central portion 21A. Moreover, in the terminal part 21B, a gland part is formed, and dust or the like containing pressurized hot gas or fine ore is ejected to the outside while preventing the rotation of the damper shaft 11 from being hindered. Is preventing.

  Specifically, a ground box 16 is provided at the ground portion in the end portion 21B, for example, as shown in FIG. The gland box 16 accommodates a gland packing 17 for preventing outflow of high-temperature gas and the like and a gland presser 18 for fixing and holding the gland packing 17. In addition, what is necessary is just to select suitably the material of the gland packing 17, an insertion position, etc. in consideration of the heat-resistant temperature etc. desired.

  The material (steel type) of the steel material constituting the damper shaft 11 is not particularly limited as long as it conforms to the use conditions, but at least between the periodic inspection and the next periodic inspection, that is, the operation period, for example, a period of 6 months It is preferable that no trouble occurs. Specifically, for example, SUS310S is preferably used. Since SUS310S has high heat resistance and oxidation resistance, the use of the steel material 21 made of SUS310S is preferable because it can reduce the occurrence frequency of defects due to the heat of high-temperature calcination at about 800 ° C.

  The length of the damper shaft 11, that is, the length (full length) of the damper shaft 11 including the central portion 21 </ b> A and the end portion 21 </ b> B is not less than the width of the mounting position of the damper 10 in the surge hopper 1. preferable. In addition, as will be described later, in the damper shaft 11, it is preferable to provide a water passage having the same center axis as that of the steel material inside the columnar steel material, thereby allowing cooling water to flow through the water passage. The damper shaft 11 is cooled (water cooled). At this time, when the total length of the damper shaft 11 is equal to or larger than the width of the mounting position of the damper 10 in the surge hopper 1, the cooling water can be supplied from the outside of the surge hopper 1. Thereby, it is possible to more effectively prevent moisture due to the cooling water from entering the surge hopper 1 and mixing moisture into the sinter.

  The damper shaft 11 is preferably provided with a key groove for fixing the flapper 12 more firmly. Note that the keyway of the damper shaft 11 is denoted by reference numeral “11g” in the sectional view of FIG. The key groove 11g is a length that matches the length of the key at the position of the damper shaft 11 to which the ear portion 12a of the flapper 12, which will be described later, is fixed, or a series from one end of the damper shaft 11 to the other end. Provided. A method of fixing the damper shaft 11 and the flapper 12 will be described in detail later, but the damper shaft 11 and the flapper can be fixed more firmly by providing the damper shaft 11 with the key groove 11g so that it can be fixed with the key. 12 and the flapper 12 can be more effectively prevented from shifting to the left and right.

[flapper]
The flapper 12 is a constituent member that is fixed to the damper shaft 11 and rotates around the shaft by the rotation of the damper shaft 11. The material of the flapper 12 is not particularly limited as long as it meets the usage conditions, and for example, SUS310S or the like is used.

  The flapper 12 has, for example, a rectangular flat surface, and places the slag as an object in an approximately parallel angle (for example, an angle of 0 °) with respect to a horizontal surface. The ore is dropped and transferred to the space below the damper 10 in a state of being rotated in the direction of an angle of −90 ° by rotation (see also FIG. 3).

  The flapper 12 is provided with a plurality of ear portions 12a having through-holes 12b at its end portions. The schematic diagram of FIG. 5 shows an example in which two ear portions 12 a are provided at the end of the flapper 12. The ear portion 12a in the flapper 12 serves as a fixing portion for integrally fixing the flapper 12 and the damper shaft 11, and by passing the damper shaft 11 through the through holes 12b of all the plurality of ear portions 12, the flapper 12 The damper shaft 11 is integrated. Then, the flapper 12 and the damper 11 are fixed by inserting the set bolt 40 toward the damper shaft 11 from the endmost portion of the ear 12 of the flapper 12.

  Here, FIG. 6A is a cross-sectional view taken along the line XX in the schematic top view of the damper 10 shown in FIG. As shown in the sectional view of FIG. 6A, in the damper 10, the damper shaft 11 is passed through the through hole 12 b provided in the ear 12 a of the flapper 12, and from the end of the ear 12 of the flapper 12. A set bolt 40 is inserted toward the damper shaft 11 to fix the flapper 12 and the damper 11.

  Further, it is preferable that a key groove is provided in the ear portion 12 a of the flapper 12 so as to be firmly fixed by the damper shaft 11. Note that the keyway of the flapper 12 is indicated by reference numeral “12g” in the sectional view of FIG. The key groove 12g is a portion into which a set bolt 40 for fixing to the damper shaft 11 is inserted, and is provided inside the through hole 12b in the ear portion 12a and is opposed to the key groove 11g provided in the damper shaft 11. It becomes. A method of fixing the damper shaft 11 and the flapper 12 will be described in detail later. By thus providing the key groove 12g in the ear portion 12a of the flapper 12 so that it can be fixed with the key, the flapper 12 can be more firmly fixed. And the damper shaft 11 can be fixed, and the lateral displacement of the flapper 12 can be more effectively prevented.

[stopper]
The stoppers 30 are provided between a plurality of ears 12a and ears 12a existing at the end of the flapper 12, that is, between adjacent ears 12a. Between adjacent ear portions 12a is a portion (hereinafter referred to as an “exposed portion”) 11E where the damper shaft 11 is exposed, and the stopper 30 is fixedly installed so as to be fitted into the exposed portion 11E.

  The stopper 30 is a rectangular plate-like member, and has substantially the same length as the length of the exposed portion 11E in the axial direction and can be fitted into the exposed portion 11E of the cylindrical damper shaft 11. It has become. The stopper 30 is not particularly limited, but is preferably a collar in which a plate-like member having a length substantially the same as the axial length of the exposed portion 11E is formed in a semi-cylindrical shape. According to such a collar, it is possible to effectively prevent the flapper 12 from shifting to the left and right with a simple shape.

  5 and 6 show an example in which a semi-cylindrical color is used as the stopper 30, and the specific description will be continued below as "color 30".

  Here, FIG. 6B shows a YY cross section in the schematic top view of the damper 10 shown in FIG. 5, that is, a cross-sectional view at a position between the ear portion 12a and the ear portion 12a of the flapper 12. FIG. As shown in the cross-sectional view of FIG. 6B, in the damper 10, the damper shaft 11 is not surrounded by the flapper 12 and exposed at a position between the ears 12a of the flapper 12 and the ears 12a. A semi-cylindrical collar 30 is fixedly installed on the exposed portion 11E.

  The method of fixing the collar 30 to the exposed damper shaft 11 is not particularly limited. For example, as shown in the sectional view of FIG. 6B, a hole is formed in the collar 30 toward the damper shaft 11 and fixed by plug welding. It is preferable to do. According to the plug welding, the work is easy and the collar 30 can be fixed to the damper shaft 11 more firmly. In addition, the code | symbol "45" in sectional drawing of FIG.6 (b) shows a plug weld part.

  In the damper 10 according to the present invention, the collar 30 is fixedly installed on the exposed portion 11E of the damper shaft 11 between the adjacent ear portions 12a, whereby thermal expansion or the like occurs in the flapper 12 due to the influence of the heat of the high-temperature mine. Even in this case, the collar 30 acts as a so-called fastener, and the flapper 12 can be prevented from shifting in the axial direction of the damper shaft 11.

(Damper assembly operation)
As described above, the damper 10 according to the present invention includes the damper shaft 11 and the flapper 12 that rotates around the damper shaft 11, and includes a plurality of through holes 12 b at the end of the flapper 12. The ear part 12a is provided, and the flapper 12 and the damper shaft 11 are integrally fixed by passing the damper shaft 11 through the through holes 12b of all the plurality of ear parts 12a. In the damper 10, the exposed portion (exposed portion) 11E of the damper shaft 11 between the adjacent ear portions 12a is a plate-like member having a length substantially the same as the axial length of the exposed portion 11E. A semi-cylindrical collar 30 is fixedly installed. The damper 10 having such a configuration can be assembled as follows.

  First, when the damper shaft 11 is inserted into the through holes 12b of the plurality of ear portions 12a existing in the flapper 12 and the damper shaft 11 is inserted to a predetermined position, the set bolt 40 is inserted from the end of the ear portion 12a of the flapper 12. And the damper shaft 11 and the flapper 12 are fixed.

  Here, as described above, the damper shaft 11 is preferably provided with the key groove 11g, and the flapper 12 also has a key provided on the damper shaft 11 inside the through hole 12b of the ear portion 12a. A key groove 12g is preferably provided at a position corresponding to the groove 11g.

  As described above, when the key grooves 11g, 12g are provided in the damper shaft 11 and the ear portion 12a of the flapper 12, the key is fitted into the key groove 11g of the damper shaft 11, and the key groove of the ear portion 12a of the flapper 12 is obtained. The damper shaft 11 is passed through the ear portion 12a so that 12g and the key fitted to the damper shaft 11 match. Then, when the damper shaft 11 is inserted to a predetermined position of the flapper 12, that is, to a position where the key is hidden by the key groove 11 g of the damper shaft 11 and the key groove 12 g of the ear portion 12 a of the flapper 12, The damper shaft 11 and the flapper 12 are fixed by inserting the set bolt 40 into the screw hole provided in the direction in which the key is pushed into the key groove 11g of the damper shaft 11 from the end of the portion 12a. As described above, the cross-sectional view of FIG. 6A shows a state in which the key shafts 11g and 12g are provided in the damper shaft 11 and the ear portion 12a of the flapper 12, and the set bolt 40 is screwed in.

  Next, since the damper shaft 11 and the flapper 12 are integrally fixed, the exposed portion 11E of the damper shaft 11 generated between the ear portion 12a and the ear portion 12a of the flapper 12 is moved in the axial direction of the exposed portion 11E. A semi-cylindrical collar 30 which is a plate-like member having a length substantially the same as the length is fixedly installed. In fixing, for example, the collar 30 is fixed by making a hole toward the damper shaft 11 and performing plug welding.

  As described above, the cross-sectional view of FIG. 6B shows a state where the collar 30 is fixedly installed on the exposed portion 11E of the damper shaft 11 by plug welding (plug welding portion 45). Further, the damper shaft 11 on which the collar 30 is fixedly installed and the flapper 12 are fixed by performing welding such as fillet welding on the portion where the outer edge portion of the collar 30 and the ear portion 12a of the flapper 12 abut. Can be strong.

(A more preferred embodiment of the damper shaft)
Here, in the damper shaft 11 which comprises the damper 10, it is preferable to cool using a cooling water etc. from a viewpoint of preventing the deformation | transformation by the heat | fever of a hot sinter. However, if the cooling water used for cooling leaks into the ash hopper 8, there is a risk that moisture will enter the mine and cause a steam explosion in the electric furnace 7 at the charging destination. Therefore, even if the damper shaft 11 is damaged, it is necessary to have a structure in which the cooling water does not leak into the sinter hopper 8.

Therefore, in the damper shaft 11, a cylindrical water passage having the same center axis as that of the steel material is provided inside the cylindrical steel material, and the diameter of the circular cross section of the cylindrical steel material is D1, When the diameter (inner diameter) of the circular cross section of the water channel is D2, it is preferable that the following relational expression (I) is satisfied.
0.2 × D1 ≦ D2 ≦ 0.55 × D1 (I)

  Specifically, FIG. 7 is a diagram for explaining the configuration of the damper shaft 11. Note that, as shown in FIG. 7, a columnar steel material constituting the damper shaft 11 is referred to as “steel material 21”, and a water passage provided inside the columnar steel material 21 is referred to as “water passage 22”.

  The water passage 22 is provided inside the columnar steel material 21 as described above, and is provided in a columnar shape so that the center axis of the steel material 21 is the same. As shown in FIG. 7, the water passage 22 is formed continuously (consistently) over the entire length of the steel material 21 constituting the main body of the damper shaft 11 in the major axis direction. Cooling water for water cooling is passed. Specifically, a cooling water pipe (hose) 23 for supplying and discharging cooling water is connected to the end portion of the water passage 22, for example, in one direction from X to Y in FIG. 7. Cooling water passes through the water passage 22. By cooling the steel material 21 with the cooling water through the water passage 22 in this way, it is possible to prevent the damper shaft 11 from being deformed by the heat of the high-temperature sinter.

  Considering that the damper shaft is a long cylinder, for example, inside the damper shaft, for example, a water passage is provided only at both ends, and cooling water is supplied to the water passage provided only at both ends. It is conceivable to cool without passing cooling water through the position corresponding to the inside of the surge hopper of the damper shaft. Specifically, for example, as shown in a damper shaft 50 of FIG. 8, a water passage is not provided in the central portion of the steel material 51 constituting the main part of the damper shaft 50, and the water passage is provided only at both end portions of the steel material 51. A method may be considered in which one is provided with two water passages 52 (one water passage is provided on one damper shaft (water passages 52a and 52b), and cooling water is circulated through the water passages 52 at the respective end portions. It is considered that the strength of the damper shaft 50 can be maintained by adopting a configuration in which a water passage is not provided in the central portion of the damper shaft 50.

  However, as in the case of the damper shaft 50 shown in FIG. 8, when the water passage 52 is provided only at both end portions and the water passage is not provided at the central portion, cooling of the central portion becomes insufficient. There is a possibility that the deformation and breakage of the damper shaft 50 due to the heat of the high-temperature burned ore at about 800 ° C. cannot be effectively prevented.

  Further, in such a structure in which the cooling water is circulated at the end of the damper shaft 50, the flow of the cooling water at the tip of the water-cooled portion (Z portion in FIG. 8) provided in the longitudinal direction with respect to the damper shaft 50. The direction of will be reversed. Then, in the place where the direction of the flow is reversed, the foreign matter mixed in the cooling water accumulates, the blockage occurs at that place, and the cooling effect is deteriorated due to poor circulation of the cooling water. When using, for example, industrial water drawn from a river as cooling water for cooling, foreign matter that causes poor circulation due to accumulation is river sand mixed in the cooling water, and it accumulates very easily, It takes time and cost to remove accumulated foreign matter. Furthermore, in such a structure, it is necessary to provide at least two water passages 52 (one at each end) on the damper shaft 50, and there are many places to check for clogging of the cooling water. Four expensive flexible hoses (cooling water pipes) 53 (one for each of the water passages 52) are required to pass through, so that efficient cooling becomes difficult economically.

For these reasons, in the damper shaft 11, the column-shaped water passage 22 is provided in the columnar steel material 21 constituting the damper shaft 11 so that the steel material 21 and the central axis are the same. It is provided continuously over the entire length in the long axis direction, and cooling water is passed through the water passage 22. At this time, when the diameter of the circular cross section of the steel material 21 is D1 and the diameter (inner diameter) of the circular cross section of the water passage 22 is D2, the steel material 21 and the water passage 22 are configured to satisfy the following relational expression. Like to do.
0.2 × D1 ≦ D2 ≦ 0.55 × D1 (I)

  In the damper shaft 11, the water passage 22 is continuously provided in the cylindrical steel material 21 over the entire length in the major axis direction of the steel material 21, so that the longitudinal axis of the damper shaft 11 is increased. Since cooling water is also passed through the central portion 21A and the entire damper shaft 11 is cooled during operation, thermal deformation and breakage of the damper shaft 11 including the central portion 21A can be effectively suppressed.

  Moreover, since the water flow direction 22 can be set to one direction with only one pipe of the water flow path 22 through which the cooling water flows, the flow of the cooling water becomes smooth. For example, for cooling the structure shown in FIG. In comparison, the occurrence of clogging of cooling water can be prevented. Furthermore, since the number of cooling water pipes (hoses) 23 for supplying and discharging cooling water can be two, the burden of inspection and replacement can be reduced.

  Further, since the water passage 22 is cylindrical and the central axis thereof is the same as the cylindrical steel material 21, the thickness is uniform and the heat effect is uniformly received. Deformation can also be suppressed.

  In particular, the steel material 21 and the water passage 22 formed in the interior thereof are each configured with a diameter satisfying the relational expression (I), so that the strength of the steel material 21 is maintained while maintaining the strength. It is possible to increase the strength of the steel, and to effectively generate defects such as deformation of the steel material 21 due to the heat of the sinter of about 800 ° C. during the operation period, breakage of the damper shaft 11 and defective opening / closing of the damper 10 based on the deformation. Can be prevented.

  Regarding relational expression (I), if D2> 0.55 × D1, the damper shaft 11 is cooled, but the strength of the damper shaft 11 is insufficient. Specifically, for example, the damper shaft 11 may be deformed or bent. In addition, cracks are likely to occur at the locations where deformation occurs in this way, and when cracks occur, cooling water leaks from the cracked locations and moisture is mixed into the sinter, and the baked ore containing moisture becomes an electric furnace. May be charged.

  On the other hand, if D2 <0.2 × D1, the damper shaft 11 is not sufficiently cooled, and a malfunction may occur. That is, for example, when using industrial water having a pressure of about 0.1 MPa to 0.5 MPa as cooling water, the inner diameter of the water passage 22 provided in the damper shaft 11 is smaller than “0.2 × D1”. Then, the temperature for maintaining the strength of the damper shaft 11 (about 500 ° C. or less) cannot be maintained. For this reason, if D2 <0.2 × D1, deformation or breakage due to heat from the sinter may not be sufficiently prevented.

  As described above, the diameter (D1) of the steel material 21 constituting the damper shaft 11 is particularly limited as long as this D1 and the diameter (D2) of the circular cross section of the water passage 22 can satisfy the relational expression (I). Although not specifically, it is preferable that 100 mm ≦ D1 ≦ 150 mm. If D1 is less than 100 mm, the required strength may not be sufficiently obtained. On the other hand, if D1 exceeds 150 mm, the damper 10 body itself increases in size, and the cylinder 13 for operating the damper 10 also becomes large. This increases the size of the entire facility and significantly increases the capital investment.

  The method of passing the cooling water to the water passage 22 is not particularly limited, and a flexible cooling water pipe (hose) 23 is connected to both ends of the cylindrical water passage 22, and the cooling water pipe 23 is connected thereto. The cooling water can be supplied to the inside of the water passage 22 and the cooling water passing through the water passage 22 can be discharged. Specifically, as shown in FIG. 7, a cooling water pipe (cooling water supply) for supplying cooling water to the water passage 22 at one end (the X-side end in FIG. 7) of the water passage 22. Pipe) 23a is connected, and the other end (Y side end in FIG. 7) is connected with a cooling water pipe (cooling water discharge pipe) 23b for discharging the cooling water that has passed through the water passage 22. . In this manner, the two cooling water pipes 23a and 23b are connected to the water passage 22 continuously provided in the cylindrical steel material 21 constituting the damper shaft 11 over the major axis direction thereof. The damper shaft 11 can be effectively cooled by allowing cooling water to flow through the water passage 22 in one direction. Thereby, deformation | transformation and breakage by the heat | fever of a high temperature sinter can be prevented, maintaining the intensity | strength of the damper shaft 11. FIG.

  At both ends of the water passage 22, in order to connect the cooling water pipe 23, it is preferable to form connection portions 24 (24 a, 24 b) (dotted circle encircled portions in FIG. 7) with female threads cut. Specifically, a connecting portion 24 with a female thread cut is formed at the end of the water passage 22 so that a connecting component with a male screw cut can be fitted separately, and a cooling water pipe 23 is attached to the connecting component. Try to connect. In this way, the end portion of the water passage 22 is configured to have a female thread, so that foreign matters such as dust can be removed from the end portion of the water passage 22 during maintenance such as replacement of the cooling water pipe 23. Can be prevented, and for example, the occurrence of blockage by foreign matter in the water passage 22 can be more effectively prevented.

  The length for applying the female screw at both ends of the water passage 22 (the length of the connecting portion 24) is long enough that the connecting parts connected to the connecting portion 24 with the female screw cut off do not fall off during operation. There is no particular limitation as long as there is. For example, it is preferable to adjust including the length of the columnar steel material 21 so that the inner end of the female screw does not become deeper than the outside of the surge hopper. This is preferable because a high temperature region inside the surge hopper 1 can be avoided.

(Summary)
As described above in detail, the damper 10 according to the present invention includes the damper shaft 11 and the flapper 12 that rotates around the damper shaft 11, and a plurality of through-holes 12 b are provided at the end of the flapper 12. The flapper 12 and the damper shaft 11 are integrally fixed by passing the damper shaft 11 through the through holes 12b of all the ear portions 12a, and the exposed damper between the adjacent ear portions 12a is provided. A stopper 30 of a plate-like member having a length substantially the same as the length of the exposed portion 11E in the axial direction is fixedly installed on the exposed portion 11E of the shaft 11. Specifically, the stopper 30 may be a collar in which a plate-like member having substantially the same length as the axial length of the exposed portion 11E is formed in a semi-cylindrical shape.

  According to such a damper 10, the flapper 12 is shifted to the left and right along the axial direction of the damper shaft 11 even when the flapper 12 is thermally expanded due to the influence of heat received from the high-temperature sinter. Can be effectively prevented. Thereby, the damper 10 can implement | achieve favorable opening / closing operation | movement.

More preferably, in the damper shaft 11 constituting the damper 10, a column-shaped water passage 22 is provided in the columnar steel material 21 so that the center axis of the steel material 21 is the same as the length of the steel material 21. It is provided continuously over the entire length in the axial direction, and the cooling water is passed through the water passage 22, and the diameter (D1) of the circular cross section of the steel material 21 and the diameter of the circular cross section of the water passage 22 ( It is set as the structure which satisfy | fills the following relational expression in relation to (inner diameter) (D2).
0.2 × D1 ≦ D2 ≦ 0.55 × D1 (I)

  According to the damper 10 having such a damper shaft 11, it is possible to effectively prevent deformation and breakage of the damper shaft 11 due to heat received from the sinter, and more efficient and accurate opening / closing operation of the damper 10. Can be realized.

  In addition, regarding the safety of work, inspection and repair of the surge hopper 1 and the like containing a high-temperature mine are accompanied by the risk of heat stroke due to burns and hot work, but by applying the damper 10 as described above Since maintenance becomes easy and the need for inspection and repair can be reduced, the safety of work can be greatly improved.

<< 4. Examples >>
Hereinafter, the damper according to the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.

[Example 1]
Periodic inspection frequency period in which a surge hopper using a damper 10 as shown in FIG. 5 is passed when charging the sinter obtained from the rotary kiln used in ferronickel smelting into the sinter container. It operated for 6 months. That is, a damper shaft 11 and a flapper 12 that rotates around the damper shaft 11 are provided. Two end portions 12a having through holes 12b are provided at the end of the flapper 12, and each of the two ear portions 12a is provided. By passing the damper shaft 11 through the through-hole 12b, the flapper 12 and the damper shaft 11 are integrally fixed, and the exposed portion 11E of the damper shaft between the adjacent ear portions 12a has an axial direction of the exposed portion 11E. A damper 10 that is a plate-like member having a length substantially the same as the length and in which a semi-cylindrical stopper (collar) 30 is fixedly installed is used.

  Moreover, the damper shaft 11 of the damper 10 is a cylinder having a water passage 22 inside a cylindrical steel material 21 as shown in FIG. 7 and capable of flowing cooling water. Here, regarding the damper shaft 11, the diameter of the circular cross section of the columnar steel material 21 constituting the damper shaft 11 is “D 1”, and the diameter (inner diameter) of the water passage 22 provided in the steel material 21. ) Is “D2”, the relationship between D1 and D2 satisfies “0.2 × D1 ≦ D2 ≦ 0.55 × D1”. The steel type (material) of the columnar steel material 21 was SUS310S.

  The weight of the sinter charged in the sinter container was set at about 13 tons.

  As a result of operation for 6 months, in the damper 10 used in the surge hopper, there was no problem that the flapper 12 shifted to the left and right along the axial direction of the damper shaft 11, and the opening / closing operation could be performed satisfactorily. Further, no deformation or breakage of the damper shaft 11 occurred, and no blockage occurred in the water passage 22 provided inside the steel material 21 of the damper shaft 11.

  Subsequently, the same damper 10 was used for further 6 months of operation, but the damper 10 was not opened or closed at all, and the damper shaft 11 was not deformed or broken, and further, the water passage 22 was not blocked. It was.

[Comparative Example 1]
When charging the ore obtained from the rotary kiln used in ferronickel smelting into the sinter container, it is allowed to pass through a surge hopper using a conventional damper for 6 months corresponding to the period of periodic inspection. It operated for a long time. That is, unlike the damper 10 used in Example 1, the stopper was not fixedly installed at the exposed portion of the damper shaft between adjacent ear portions, and the damper with the damper shaft exposed was used.

  In addition, as a damper axis | shaft, like the damper used in Example 1, the thing which has a water flow path inside a cylindrical steel material and can flow cooling water was used. When the diameter of the circular cross section of the columnar steel material constituting the damper shaft is “D1” and the diameter (inner diameter) of the circular cross section of the water passage provided in the steel material is “D2”, these D1 and D2 Is configured to satisfy “0.2 × D1 ≦ D2 ≦ 0.55 × D1”. The steel type (material) of the columnar steel material was SUS310S.

  The weight of the sinter charged in the sinter container was set at about 13 tons.

  As a result of the operation over 6 months, the damper used in the surge hopper has a problem that the flapper expands and shifts to the left and right along the axial direction of the damper shaft due to the influence of the heat of the ore. Open / close operation could not be performed. The recovery required several hours, and the operation had to be temporarily stopped until the recovery, making it impossible to operate efficiently.

  The damper shaft was not deformed or broken at all, and no blockage occurred in the water channel provided inside the steel material of the damper shaft.

[Comparative Example 2]
When charging the ore obtained from the rotary kiln used in ferronickel smelting into the sinter container, it is allowed to pass through a surge hopper using a conventional damper for 6 months corresponding to the period of periodic inspection. It operated for a long time. That is, unlike the damper 10 used in Example 1, the stopper was not fixedly installed at the exposed portion of the damper shaft between adjacent ear portions, and the damper with the damper shaft exposed was used.

  Further, a damper shaft as shown in FIG. 8 was used as the damper shaft. That is, a total of four water passages 52, each having two end portions, are provided at both end portions inside the columnar steel material 51 constituting the damper shaft 50, and cooling water is circulated at each end portion so that the damper shaft 50 was allowed to cool. The steel type (material) of the columnar steel material was SUS310S.

  The weight of the sinter charged in the sinter container was set at about 13 tons.

  As a result of the operation over 6 months, the damper used in the surge hopper has a problem that the flapper expands and shifts to the left and right along the axial direction of the damper shaft due to the influence of the heat of the ore. Open / close operation could not be performed. The recovery required several hours, and the operation had to be temporarily stopped until the recovery, making it impossible to operate efficiently.

  In addition, a part of the damper shaft was also embrittled by a high-temperature gas and became thinner due to wear. If the same damper shaft was used continuously, it broke when it was used for another 4 months. During the operation period of 6 months, a blockage occurred in the water passage inside the steel material of the damper shaft.

DESCRIPTION OF SYMBOLS 1 Surge hopper 2 Rotary kiln 3 Burning container 4 Conveyor cart 5 Furnace crane 6 Burning bin 7 Electric furnace 8, 8a, 8b Burning hopper 10, 10a, 10b Damper 11 Damper shaft 11g Keyway 11E Exposed part 12 Flapper 12a Ear Part 12b Through hole 12g Keyway 13 Cylinder 14 (14a, 14b) Load cell 15 Caster 21 Steel material 22 Water passage 23, 23a, 23b Cooling water piping 24 Connection part 30 Stopper (color)
40 Set bolt 45 Plug welded part

Claims (9)

A damper that includes a damper shaft and a flapper that rotates about the damper shaft, and that causes an object placed on the flapper to drop by opening and closing control by rotation of the flapper,
The object is a sinter produced by ferronickel smelting,
Wherein the end portion of the flapper, the plurality of ears is provided with a through-hole, and the said flapper and said damper shaft while passing the damper shaft in the through holes of all of the ear portion is integrally fixed,
A stopper having a length substantially the same as the length of the exposed portion in the axial direction , which is formed of a plate-like member, is fixedly installed at the exposed portion of the damper shaft between the adjacent ear portions. A damper. The damper according to claim 1, wherein the stopper is a collar in which a plate-like member having a length substantially the same as an axial length of the exposed portion is formed in a semicylindrical shape. The damper according to claim 1 or 2, wherein the stopper is fixed by plug welding to the damper shaft. The damper shaft is provided with a keyway,
Inside the ear part of the flapper, a keyway is provided at a position corresponding to the keyway of the damper shaft when the damper shaft and the flapper are integrated.
The damper according to any one of claims 1 to 3, wherein the damper shaft and the flapper are fixed by fitting a key into each key groove. The damper shaft is made of a cylindrical steel material,
In the inside of the columnar steel material, a column-shaped water passage having the same central axis as the steel material is provided continuously over the long axis direction of the steel material,
When the diameter of the steel material is D1, and the diameter of the circular cross section of the water passage is D2,
0.2 × D1 ≦ D2 ≦ 0.55 × D1
The damper according to any one of claims 1 to 4, wherein the relationship is satisfied. 6. The damper according to claim 5, wherein a female screw to which a cooling water supply pipe is connected is cut at both ends of the water passage in the damper shaft. The damper according to claim 5 or 6, wherein the steel material of the damper shaft is SUS310S. The damper according to any one of claims 5 to 7, wherein in the damper shaft, the diameter D1 of the steel material is 100 mm or more and 150 mm or less. The damper according to any one of claims 1 to 8, wherein the damper is used in a surge hopper that stores the target baked ore.

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