Raw stone input apparatus for vertical furnace

Abstract

To provide a raw stone input apparatus which enables the position adjustment and replacement of a seal member to be performed very easily, and can reduce both component and work costs.MEANS FOR SOLVING THE PROBLEM: Seal member fixation structures 51, 52, 53, 54 comprise a fixing operation member (bolt 52) which is operated for fixing a seal member 47 to a cylindrical body 26, the fixing operation member 52 comprises a part to be operated (heat part 52a), which is a part to be subjected to the operation, the part 52a to be operated is located at an outside region than a body part (screw part) of the fixing operation member 52 inside the cylindrical body 26, the cylindrical body 26 comprises an opening 64 at a position corresponding to the part 52a to be operated, and a raw stone input apparatus 3 comprises opening / closing members (a door 66, a cover 262) for opening / closing the opening 64. When the opening / closing members are operated to open the opening 64, the part 52a to be operated can be immediately operated.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a raw stone charging device used in a vertical furnace, which is a facility for burning ores such as limestone. [Background technology]

[0002] Conventionally, the vertical furnace disclosed in Patent Document 1 is known as a vertical furnace that is equipment for burning ores (e.g., limestone). As shown in FIG. 12, this conventional vertical furnace has a cylindrical body 101, a lid 102, and a sealing device 103. The cylindrical body 101 has a cylindrical shape (i.e., a ring shape, i.e., annular shape) when viewed from the direction of the arrow Z. The lid 102 has a conical shape that widens downward when viewed from the direction of the arrow Z. A furnace body (not shown) for performing the burning process is installed below the cylindrical body 101.

[0003] The ore to be fired as raw stones is stored in the internal region of the cylinder 101 (the right region of the wall of the cylinder 101 in FIG. 12) and in the region above the lid 102. The sealing device 103 has a function of preventing the raw stones stored in the region above the lid 102 from leaking into the furnace body installed below the lid 102.

[0004] The sealing device 103 has a sealing member 104. During standby when raw material ore is not being charged into the furnace body, the lid 102 is biased upward as indicated by arrow Y. The lid 102 thus biased comes into contact with the lower end of the sealing member 104 from below and stops. In this state, the inside of the cylindrical body 101 is airtightly sealed, i.e., hermetically sealed, by the lid 102. In this sealed state, the raw material charged into the cylindrical body 101 is stored on the lid 102.

[0005] When the time arrives to feed the raw stones into the furnace body, the lid 102 moves a predetermined distance downward as indicated by the arrow Y', and the lid 102 moves downward away from the seal member 104 by a predetermined distance, and enters an open state. When the lid 102 enters an open state, the raw stones fall downward and are supplied into the furnace body. The raw stones thus supplied into the furnace body are subjected to a firing process.

[0006] The seal device 103 has a nut 105 and a bolt 106 that engages with the nut 105. The seal member 104 is firmly fastened to a machine frame 108 by the bolt 106 via a pressing plate 107. The machine frame 108 is an integral member with the cylindrical body 101.

[0007] A bolt cover 109 is attached to the head portion 106a of the bolt 106. This bolt cover 109 covers the head portion 106a of the bolt 106 from above. With this configuration, the bolt cover 109 can prevent the bolt 106 from colliding with the raw stones and being damaged when the raw stones fall onto the lid 102 inside the cylinder 101 or when the raw stones are stirred in the area above the lid 102. Furthermore, the bolt cover 109 can prevent the bolt 106 from loosening.

[0008] Reference numeral 110 denotes a protector. This protector 110 is provided inside the cylindrical body 101 in a cylindrical, i.e., ring-shaped, shape similar to that of the cylindrical body 101. The protector 110 is joined to the furnace body 101 by bolts or other fastening means. The protector 110 has a function of preventing the seal member 104 from being damaged when the raw ore put into the cylindrical body 101 hits the seal member 104.

[0009] Repeated feeding of raw ore into the furnace body causes the above-mentioned sealing member 104 to shift in position or deteriorate in quality. If the position shifts, the position of the sealing member 104 needs to be adjusted. If the quality deteriorates, the sealing member 104 needs to be replaced.

[0010] The position adjustment of the seal member 104 is performed as follows. First, the lid 102 is lowered in the direction of the arrow Y'. Next, the protector 110 is removed from the tube body 101. Next, the bolt 106 is loosened to adjust the contact between the seal member 104 and the lid 102. In this manner, the position adjustment of the seal member 104 is performed.

[0011] The replacement work of the seal member 104 is performed as follows. That is, first, the cover 102 is lowered in the direction of the arrow Y'. Next, the protector 110 is removed from the tube body 101. Next, the bolt cover 109 is removed from the head portion 106a of the bolt 106. Next, the bolt 106 and the pressing plate 107 are removed. Thereafter, the deteriorated seal member 104 is replaced with a new one, and the new seal member 104 is firmly attached to the machine frame 108 by the pressing plate 107 and the bolt 106. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] JP 2010-091150 A Summary of the Invention [Problem to be solved by the invention]

[0013] In the above-mentioned conventional ore charging device, the bolt 106 for fixing the seal member 104 was structured to be screwed into the nut 105 from the inside to the outside of the ore charging device. In other words, the head part 106a of the bolt 106, which is the part operated by the worker, was located inside the ore charging device rather than the threaded part. Therefore, when adjusting the position of the seal member 104 or replacing it, the worker had to remove the protector 110 or insert his hand deep inside the ore charging device, which was a very troublesome task.

[0014] In addition, since the head 106a of the bolt 106 was located inside the ore charging device, there was a risk that the ore would hit the head 106a of the bolt 106 and damage the head 106a, so in order to prevent this, a bolt cover 109 had to be provided around the head 106a, which led to an increase in parts costs and labor costs.

[0015] The present invention has been made in consideration of the above-mentioned problems with conventional devices, and aims to provide a raw material feeding device which makes it very easy to adjust the position of the sealing member and to replace the sealing member, and which also reduces parts costs and labor costs. [Means for solving the problem]

[0016] The ore charging device according to the present invention is a raw material charging device for supplying raw materials to a furnace body of a vertical furnace, and includes a cylindrical body into which the raw materials are charged, a sealing member attached to an inner wall of the cylindrical body, a sealing member fixing means capable of fixing the sealing member to the cylindrical body in a fixed position and releasing the fixing, and a sealing lid provided inside the cylindrical body and movable between a position in contact with the fixed sealing member and a position away from the fixed sealing member, the released sealing member being movable along the moving direction of the sealing lid, and the sealing member fixing means being capable of fixing the moved sealing member at the moved position. In a raw material feeding device that supplies the raw materials to the furnace body through a space formed between the sealing lid and the sealing member when the sealing lid is separated from the sealing member, the sealing member fixing means has a fixing operation means that is operated to fix the sealing member to the cylindrical body, the fixing operation means has an operated part that is the part that receives operation, the operated part is located inside the cylindrical body in an outer area than a main body part of the fixing operation means, the cylindrical body has an opening at a position corresponding to the operated part, and the raw material feeding device has an opening / closing member that opens and closes the opening.

[0017] In the above configuration, the "fixing operation means" refers to a means that is operated when fixing an object (e.g., the seal member 47) to a mating member (e.g., the seal ring 51). Also, the "operated part" refers to a part that is actually operated by an operator when fixing an object to a mating member by the above fixing operation means. The opening and closing member may be a door that opens and closes the opening by pivoting, i.e., rotating, or a lid that can be attached to and detached from the opening.

[0018] In another embodiment of the raw stone feeding device of the present invention, the fixing operating means is a bolt that presses the sealing member against the cylindrical body to fix it, the operated part is the head portion of the bolt, and the operated part is operated through the opening.

[0019] In yet another embodiment of the raw stone feeding device of the present invention, the sealing member is arranged in a cylindrical shape by connecting a plurality of sealing member pieces, and the opening is arranged at a position corresponding to the sealing member piece.

[0020] In yet another aspect of the raw material feeding device of the present invention, a protector is provided on the inner side of the pressure plate to prevent raw materials fed into the inside of the cylinder from hitting the sealing member.

[0021] In yet another aspect of the raw stone feeding device of the present invention, the protector has an upper protector and a lower protector, the upper protector is fixed to the inner surface of the cylindrical body, and the lower protector is removably attached to the upper protector.

[0022] In yet another embodiment of the raw stone feeding device of the present invention, the protector is arranged in a cylindrical shape by connecting a plurality of protector pieces, and the opening is arranged at a position corresponding to the protector pieces. Effect of the Invention

[0023] In the ore charging device of claim 1, the operated part (e.g., the head part of the bolt) of the fixing operation means (e.g., the bolt) is located in an outer area inside the cylinder than the main body part (e.g., the threaded part of the bolt) of the fixing operation means (e.g., the bolt). Therefore, the worker can easily touch the operated part (e.g., the head part) compared to when the operated part (e.g., the head part) is located in a deep area inside the cylinder. Therefore, the worker can very easily adjust the position and replace the sealing member.

[0024] In addition, since the operated part (e.g., the head part of the bolt) of the fixing operation means (e.g., the bolt) is located in an area outside the main body part (e.g., the threaded part of the bolt) of the fixing operation means (e.g., the bolt) inside the cylinder, the raw material (e.g., the ore) put into the cylinder almost never hits the operated part. Therefore, parts such as the bolt cover that conventionally covers the operated part (e.g., the head part) are no longer necessary. This makes it possible to reduce parts costs and labor costs.

[0025] Furthermore, since a work window opening is provided in the cylinder near the part to be operated (e.g., the head portion), the worker can open the opening by operating the opening / closing member of the work window and immediately perform operations on the part to be operated (e.g., the head portion), thereby enabling work to be performed simply, quickly and comfortably. [Brief description of the drawings]

[0026] [Figure 1] 1 is a cross-sectional view showing a raw material charging device according to the present invention and a vertical furnace using the same. [Diagram 2] 2 is an enlarged cross-sectional view showing the rough stone charging device of FIG. 1. [Diagram 3] 3 is an enlarged cross-sectional view showing a portion indicated by arrow B in FIG. 2. [Figure 4]1A and 1B are diagrams showing a seal member piece which is a component of the seal member, in which (a) is a front view and (b) is a plan view. [Diagram 5] FIG. 4 is a plan sectional view of the ore charging device taken along line DD in FIG. 3. [Figure 6] FIG. [Figure 7] 6 is a diagram showing a part of a side structure of the rough stone charging device according to the arrow C in FIG. 5. [Figure 8] FIG. 4 is a cross-sectional view showing another embodiment of the rough stone charging device according to the present invention. [Figure 9] FIG. 9 is a plan sectional view of a part of the rough stone charging device taken along line DD in FIG. 8. [Figure 10] FIG. 10 is a plan view of a lid which is a component of the embodiment of FIGS. 8 and 9. [Figure 11] 10 is a diagram showing a part of a side structure of the rough stone charging device according to the arrow C in FIG. 9. [Figure 12] FIG. 1 is a cross-sectional view showing a sealing device which is a main part of a conventional rough stone charging device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, a shielding device according to the present invention will be described based on an embodiment. However, the present invention is not limited to this embodiment. In addition, in the drawings attached to this specification, components may be shown at different ratios from the actual ones in order to easily show characteristic parts.

[0028] (vertical furnace) Fig. 1 shows the overall structure of one embodiment of a shaft furnace and a raw material charging device according to the present invention. Fig. 2 shows an enlarged view of the raw material charging device along the line AA in Fig. 1. The shaft furnace 1 shown in Fig. 1 is a so-called inner cylinder suspended type Beckenbach furnace, which is a furnace for burning limestone ore to produce quicklime.

[0029] The vertical furnace 1 has a furnace body 2 and a raw material charging device 3. The furnace body 2 has an outer cylinder 4 and an inner cylinder 6. The inner cylinder 6 is provided inside the outer cylinder 4. The inner cylinder 6 is supported by bridges 7a and 7b extending from the inner wall of the outer cylinder 4. The raw material charging device 3 supplies raw material, such as limestone, into the space between the outer cylinder 4 and the inner cylinder 6. The inner cylinder 6 forms a raw material passage and also functions as a passage for circulating gas within the furnace body 2.

[0030] Both the outer cylinder 4 and the inner cylinder 6 are formed of a heat-resistant metal material, bricks, etc. The outer cylinder 4 has an outer diameter of, for example, 5300 mm and an inner diameter of 4200 mm. The outer diameter of the inner cylinder 6 is, for example, 2140 to 2240 mm. The overall height of the vertical furnace 1 is, for example, 35 m (meters).

[0031] A product discharge device 11 is provided below the outer cylinder 4, and a hopper 15 is provided further below that. The product discharge device 11 has a fixed table 8 on which the quicklime product is placed, and a paddle 9 which rotates on the fixed table 8 about a central axis X0. As the paddle 9 rotates, a predetermined amount of quicklime accumulated on the table 8 falls and is discharged into the lower part of the hopper 15. The amount of quicklime discharged can be adjusted by adjusting the rotation speed of the paddle 9. Note that the quicklime discharge structure may be any other structure.

[0032] From the top, the furnace body 2 is functionally composed of a preheating zone A1, a calcination zone A2, and a cooling zone A3. In the calcination zone A2, a plurality of first burners 12a are provided at intervals in the circumferential direction under the first bridge 7a on the outer periphery of the outer cylinder 4. In addition, a plurality of second burners 12b are provided at intervals in the circumferential direction under the second bridge 7b. An injector 13 is attached to the second burner 12b. In addition, a recuperator (heat exchanger) 14 is attached to the inner cylinder 6.

[0033] Air in the outer cylinder 4 and the inner cylinder 6 is sucked in by an exhaust fan 16. The sucked in air is collected by a dust collector 17 and then exhausted to the outside. A combustion air fan 18 supplies working air to the injector 13 via the recuperator 14, and further supplies primary air to the burners 12a and 12b. An inner cylinder cooling fan 19 supplies air for cooling the inner cylinder 6.

[0034] The inside of the outer cylinder 4 and the inner cylinder 6 is set to a negative pressure, that is, an air pressure lower than the outside air, by air suction by the exhaust fan 16. This negative pressure causes air to be sucked in from the hopper 15 at the bottom of the furnace body 2. This air cools the quicklime produced in the calcination zone A2 in the furnace body 2.

[0035] The raw materials supplied from the raw material charging device 3 to between the outer cylinder 4 and the inner cylinder 6 of the furnace body 2 are preliminarily heated in the preheating zone A1. In the calcination zone A2, combustion gas is discharged from the burners 12a and 12b, and the temperature of the combustion chamber including the burners becomes 1000°C to 1500°C. The combustion gas is blown out from the lower ends of the bridges 7a and 7b to the side and directly below to calcine the raw materials. This calcination produces the desired product, quicklime. The bridges 7a and 7b prevent the raw materials from coming into direct contact with the combustion flame (flame). The gas generated in the calcination zone A2 rises to the preheating zone A1, exchanges heat with the raw materials in the recuperator 14, is sucked in by the exhaust fan 16, passes through the dust collector 17, and is released into the atmosphere.

[0036] The inside of the furnace body 2 is under negative pressure, and this negative pressure causes air to be sucked in from the lower part of the furnace body 2 and flow into the inside. The quicklime produced in the calcination zone A2 is cooled in the cooling zone A3 by this air flow, and then taken out in predetermined amounts by the product discharge device 11 and discharged to the outside from the bottom end of the hopper 15. The discharged quicklime is transported to a predetermined location by a discharge transport facility such as a conveyor.

[0037] Cooling the quicklime in the cooling zone A3 prevents damage to the product discharge device 11 and other discharge equipment due to heat. The air that has contributed to cooling the quicklime becomes tertiary air for the lower burner 12b.

[0038] The recuperator 14 recovers the heat contained in the exhaust gas introduced from the intermediate inlet 22 of the inner cylinder 6, and preliminarily heats the primary air of the burners 12a and 12b and the working air of the injector 13. By adjusting the amount of working air of the injector 13, a part of the combustion gas of the lower burner 12b is sent upward and the other part is sent downward. The air sent downward enters the inner cylinder 6 together with the product cooling air, is sucked in by the injector 13, and enters the lower combustion chamber again.

[0039] The air from the inner cylinder cooling fan 19 cools the inner cylinder 6 and is preheated to about 200°C to 300°C, then passes through a collecting pipe in the middle of the furnace, where a portion of the air is used as secondary air for the burners 12a and 12b, and the remainder is discharged to the outside. The air from the combustion air fan 18 is heated to about 400°C to 500°C in the recuperator 14, where a portion of the air becomes the working air for the injector 13, and the remainder becomes the primary air for the burners 12a and 12b. The exhaust fan 16 draws the exhaust gas that has passed through the calcination zone A2 and the preheating zone A1 into an exhaust duct installed at the top of the furnace, and then discharges it to the outside via a dust collector 17.

[0040] (Rough stone input device) In FIG. 2, the raw ore charging device 3 has a cylinder 26 connected to the upper end of the furnace body 2, a raw ore charging pipe 27 connected to the upper end of the cylinder 26, a conveyor 28 for transporting raw materials, and a raw material hopper 29 for storing raw materials. The cylinder 26 has, from the top, a first expanding section 31, an intermediate section 32, and a second expanding section 33. The first expanding section 31 has a conical shape that expands downward. The intermediate section 32 has a shape in which an upper small-diameter cylindrical section and a lower large-diameter cylindrical section are connected by a conical section that expands downward. The second expanding section 33 has a conical shape that expands downward. The upper end of the furnace body 2 is connected to the bottom end of the second expanding section 33.

[0041] A hollow rotating shaft 34 is provided in the center of the cylinder 26. The rotating shaft 34 is provided on the machine frame so as to be rotatable but immovable up and down. A sprocket 37 is fixed to the upper part of the rotating shaft 34. Power is transmitted from a driving source such as a motor via the sprocket 37, causing the rotating shaft 34 to rotate about its own central axis, i.e., to rotate axially. A paddle 36 is fixed to the outer circumferential surface of the rotating shaft 34. The paddle 36 revolves integrally with the rotating shaft 34. In this embodiment, the number of paddles 36 is one.

[0042] A shaft member 38 is coaxially inserted into the hollow portion of the rotating shaft 34. The shaft member 38 passes through the rotating shaft 34. A wire 39 is fixed to the upper end of the shaft member 38. A weight 41 is connected to the other end of the wire 39. The shaft member 38 is pulled by the weight 41 and lifted upward. A hydraulic cylinder 43 is attached to the weight 41. When the hydraulic cylinder 43 is in a non-operating state, the weight 41 is at the lowest position due to its own weight. When the hydraulic cylinder 43 is operated, the weight 41 is lifted upward, and at that time, the shaft member 38 is lowered downward.

[0043] A sealing lid 42 is fixed to the lower end of the shaft member 38 so as to be unrotatable and unmovable in the vertical direction. The sealing lid 42 has a conical shape with a small diameter at the top and a large diameter at the bottom. A sealing device 44 is provided at the bottom end of the middle part 32 of the cylindrical body 26. The sealing device 44 has a sealing member 47 as shown in FIG.

[0044] The seal member 47 is formed by connecting a plurality of elongated seal member pieces 47a, each having a width W0 of about 170 mm and a length L0 of about 950 to 1000 mm, as shown in Fig. 4(a), into a cylindrical shape (i.e., a ring shape, i.e., annular shape) as shown in Fig. 5. The diameter of this ring corresponds to the diameter of the portion to be sealed of the sealing lid 42 in Fig. 2. The seal member pieces 47a are formed of an elastic material (for example, heat-resistant resin, heat-resistant rubber, etc.). More specifically, they are formed of Viton rubber, which is a well-known fluorine-based rubber that is heat-resistant rubber.

[0045] In Fig. 4(b), the thickness t0 of the seal member piece 47a is, for example, about 25 mm, and a step portion with a longitudinal length L1 of about 20 mm is provided at both ends. When connecting a plurality of seal member pieces 47a into a ring shape, the step portions at the ends of adjacent seal member pieces 47a are overlapped. This prevents gaps from being generated at the joints of the seal member pieces 47a. A plurality of long holes 59 for passing bolts 52 through are provided at appropriate positions of the seal member pieces 47a.

[0046] 2, when the weight 41 moves downward due to its own weight, the shaft member 38 moves upward, and the sealing lid 42 moves upward accordingly. The upward movement of the sealing lid 42 is stopped when the conical surface of the sealing lid 42 comes into contact with the seal member 47 in the seal device 44 from below in FIG. 3. In this state, the interior of the cylinder 26 is airtightly sealed, i.e., hermetically sealed, at the top and bottom regions by the sealing lid 42.

[0047] In FIG. 2, a lid 46 is provided at the ore inlet of the ore inlet pipe 27. The lid 46 can move between a position where the ore inlet is airtightly sealed and a position where the ore inlet is open. For example, the lid 46 opens and closes the ore inlet by pivoting vertically around its end. Thus, the ore inlet device 3 has a double sealed structure in which the sealing lid 42 and the lid 46 each have a sealing function.

[0048] According to the above-mentioned raw material charging device 3, the raw materials are transported to the furnace top by a conveyor or bucket elevator and stored in a raw material hopper 29 installed at the furnace top. The raw materials are then transported by a conveyor 28 installed at the furnace top to above the raw material charging port, which is the upper end of the raw material charging pipe 27. When the raw materials are charged, the charging lid 46 is in an open state, and the raw materials are charged into the inside of the cylinder 26 through the raw material charging port. When the raw materials are not being charged into the inside of the cylinder 26, the charging lid 46 is set in a closed state to prevent outside air from entering.

[0049] When the sealing lid 42 is in contact with the seal member 47 (see FIG. 3) of the sealing device 44 in the cylindrical body 26 and in a sealed state, the raw material put into the cylindrical body 26 is stored on the sealing lid 42. When the rotating shaft 34 is driven to rotate by a driving source such as a motor, the paddle 36 rotates about the axis, thereby stirring the raw material and making the stored state uniform.

[0050] When the time arrives to feed the raw materials into the furnace body 2, the hydraulic cylinder 43 in Fig. 2 is operated to lift the weight 41 a predetermined distance. Then, the shaft member 38 suspended from the wire 39 descends, and the sealing lid 42 moves downward a predetermined distance accordingly, and the sealing lid 42 moves away from the sealing member 47 of the sealing device 44 a predetermined distance and enters an open state. When the sealing lid 42 enters an open state, the raw materials fall downward and are supplied between the outer tube 4 and the inner tube 6 of the furnace body 2. In this way, the raw materials supplied to the inside of the furnace body 2 are subjected to a firing process.

[0051] (Sealing device 44) As shown in Fig. 3, the sealing device 44 has a sealing member 47 and a sealing member fixing structure 50. The sealing member fixing structure 50 is a structure that fixes the sealing member 47 to the cylindrical body 26 so as not to move, and has a function of being able to release the fixation. The sealing member fixing structure 50 has a seal ring 51, a bolt 52, a nut 53, and a pressing plate 54. The bolt 52 is used as a fixing operation means. The "fixing operation means" refers to a means that is operated when fixing an object (the sealing member 47 in this embodiment) to a mating member (the seal ring 51 in this embodiment).

[0052] As shown in Fig. 5, the seal ring 51 is a cylindrical ring member. The seal ring 51 has a protruding edge 51a extending outward. Specifically, the protruding edge 51a is fixed to the seal ring 51 by welding. In Fig. 3, the protruding edge 51a is fixed to the cylindrical body 26 by fastening means (e.g., bolts 57 and nuts 58). As a result, the seal ring 51 is integrated with the cylindrical body 26.

[0053] The pressing plate 54 is formed by connecting members 54a each having a width W1 of, for example, about 200 mm and a length L2 of, for example, about 950 to 1000 mm into a cylindrical shape (i.e., a ring shape, i.e., annular shape) as shown in Fig. 5, as shown in Fig. 6. In this embodiment, a plurality of nuts 53 shown in Fig. 3 are used, and the plurality of nuts 53 are attached to the outer circumferential surface of the pressing plate 54 as shown in Fig. 5. The plurality of nuts 53 are fixed (for example, welded) to the outer circumferential surface of the pressing plate 54 at intervals from each other as shown in Fig. 6.

[0054] In Fig. 3, bolt 52 is engaged with nut 53 while passing through a through hole of seal ring 51. Bolt 52 has head portion 52a which functions as an operated portion. The "operated portion" means a portion which is actually operated by an operator when fixing an object to a mating member by the above-mentioned fixing operation means. When an operator tightens bolt 52 by turning head portion 52a of bolt 52 with a tool (e.g., a wrench), seal member 47 can be pressed against seal ring 51 by pressing plate 54, and thereby seal member 47 can be fixed to cylinder 26.

[0055] (Protector) In FIG. 3, a protector 71 is provided from the upper wall of the cylindrical body 26 to the vicinity of the sealing lid 42. The protector 71 is formed by joining an upper protector 71a and a lower protector 71b with fastening means (e.g., a bolt 72 and a nut 73). The upper end of the upper protector 71a is fixed to the cylindrical body 26 by fastening means (e.g., a bolt). As shown in FIG. 5, the protector 71 is provided in a cylindrical shape coaxial with the cylindrical body 26. The protector 71 is divided into a plurality of pieces in the circumferential direction, and the upper part of each divided piece is fixed to the cylindrical body 26, so that the protector 71 has a cylindrical shape as a whole as shown in FIG. 5. The protector 71 mainly prevents the raw material charged into the cylindrical body 26 from colliding with the sealing member 47 and damaging the sealing member 47.

[0056] (Work window) In this embodiment, as shown in Fig. 5, a plurality of working windows 63 are provided at positions corresponding to the head portions 52a of the plurality of bolts which are the parts to be operated. Each working window 63 has an opening 64 provided in the wall of the cylindrical body 26 at a position corresponding to the head portion 52a, a window frame 65 attached to the cylindrical body 26, and a door 66.

[0057] FIG. 7 shows the side structure of the raw stone input device 3 (see FIG. 2) along the arrow C in FIG. 5. In FIG. 7, the opening 64, the window frame 65, and the door 66 are each formed in a rectangular shape, particularly a rectangular shape. The door 66 is attached to the window frame 65 by hinges 67, 67. A handle 68 is attached to one side of the door 66. An operator can open and close the door 66 relative to the opening 64 by operating the handle 68 to pivot, i.e., rotate, the door 66 about the hinge 67. When the door 66 closes the opening 64, the door 66 can be fixed (i.e., locked) to the window frame 65. An operator can release the fixation by operating the handle 68.

[0058] (Sealing member position adjustment and replacement work) When the firing process of raw ore is repeatedly performed in the vertical furnace 1 shown in Fig. 1, the position of the sealing member 47 in Fig. 3 may shift, or the quality of the sealing member 47 may deteriorate to the point where it is no longer suitable for use. If the position of the sealing member 47 shifts, a position adjustment work is required. Also, if the sealing member 47 deteriorates, a replacement work is required.

[0059] The position adjustment of the seal member 47 is performed as follows. (1) In FIG. 5, the handle 68 of the access window 63 corresponding to the seal member 47 that is thought to require adjustment is operated to open the door 66. (2) Insert a tool 74 (such as a wrench) into the inside of the cylinder 26 through the opening 64 at the back of the open door 66 as shown in FIG. 7, fit the tool 74 into the head portion 52a of the bolt 52, and then loosen the bolt 52. (3) In FIG. 3, the upper end of the sealing member 47 is hit with a tool (for example, a hammer) to adjust the contact between the sealing member 47 and the sealing lid 42. (4) After the adjustment work is completed, the bolt 52 is tightened with the tool 74, and then the tool 74 is taken out of the window frame 65 through the opening 64, and the door 66 is closed.

[0060] The replacement of the seal member 47 is carried out as follows. (1) In FIG. 3, the sealing lid 42 is lowered by a predetermined amount. (2) In FIG. 5, the handle 68 of the access window 63 corresponding to the seal member 47 that is thought to need to be replaced is operated to open the door 66. (3) Insert a tool 74 (e.g., a wrench) into the inside of the cylinder 26 through the opening 64 at the back of the open door 66 as shown in FIG. 7, fit the tool 74 into the head portion 52a of the bolt 52, and then loosen and remove the bolt 52. (4) Furthermore, in FIG. 3, the seal member 47 and the pressing plate 54 are pulled upward. (5) Then, a new seal member 47 and a pressing plate 54 are stacked together and inserted between the protector 71 and the seal ring 51. (6) After the replacement is completed, the bolt 52 is tightened using the tool 74, and then the tool 74 is taken out of the window frame 65 through the opening 64, and the door 66 is then closed. (7) Prior to the above step (3), the bolts 72 can be loosened to remove the lower protector 71b. This creates a large space around the retaining plate 54, making it unnecessary to pull out the sealing member 47 together with the retaining plate 54, which makes the replacement easier.

[0061] In the conventional sealing device 103 shown in Fig. 12, the head portion 106a as the operated part of the bolt 106 as the fixing operation means faces the inside of the cylinder 101, that is, the inside of the rough stone charging device. In other words, the bolt 106 was structured to be screwed into the nut 105 from the inside to the outside of the rough stone charging device. For this reason, when adjusting the position of the sealing member 104 or replacing it, the worker had to remove the protector 110 or insert his hand deep inside the rough stone charging device, which was very troublesome.

[0062] In addition, since the head 106a of the bolt 106 was located inside the ore charging device, there was a risk that the ore would hit the head 106a of the bolt 106 and damage the head 106a, so in order to prevent this, a bolt cover 109 had to be provided around the head 106a, which led to an increase in parts costs and labor costs.

[0063] 3, the head portion 52a serving as the operated portion of the bolt 52 serving as the fixing operation means is located in an outer region than the main body portion (i.e., the threaded portion) of the bolt 52 inside the cylindrical body 26. Therefore, the worker can adjust the position and replace the seal member 47 much more easily than when the head portion 52a is located in a deep region of the cylindrical body 26.

[0064] Moreover, since a working window 63 is provided in the cylinder 26 near the head portion 52a, an operator can open the door 66 of the working window 63 and immediately operate the head portion 52a, which is the part to be operated, and therefore can perform work simply, quickly and comfortably.

[0065] Furthermore, since the head portion 52a as the operated portion is located in the outer region of the cylinder 26, i.e., in the region outside the protector 71, the protector 71 prevents the raw material undergoing the firing process from colliding with the head portion 52a. This eliminates the need to use a bolt cover to cover the head portion 52a. This allows for reduced parts and labor costs compared to using a bolt cover.

[0066] 5, the seal member 47 is arranged in a cylindrical shape by connecting a plurality of seal member pieces 47a (see FIGS. 4(a) and (b)). An opening 64 of the work window 63 is arranged at a position corresponding to the seal member pieces 47a. With this configuration, an operator can easily and quickly adjust and replace the seal member 47 by opening the door 66 of the work window 63.

[0067] 3, the protector 71 has an upper protector 71a and a lower protector 71b, the upper protector 71a is fixed to the inner surface of the cylindrical body 26, and the lower protector 71b is removably attached to the upper protector 71a. If the lower protector 71b is removed from the upper protector 71a, a large space can be formed near the sealing device 44, which makes it easier to work on the sealing device 44.

[0068] 5, the protector 71 is arranged in a cylindrical shape inside the cylindrical body 26 by connecting a plurality of protector pieces 71c. The opening 64 of the work window 63 is arranged at a position corresponding to the protector pieces 71c. With this configuration, a worker can easily and quickly perform work on the protector 71 by opening the door 66 of the work window 63.

[0069] (Second embodiment of the raw stone charging device) Figures 8, 9, 10, and 11 show a second embodiment of the raw stone charging device. In these figures, the same members as those in the first embodiment described with reference to Figures 3, 5, and 7 are designated by the same reference numerals, and the description of those members is omitted.

[0070] In FIG. 8, the raw stone injection device 203 of this embodiment has a working window 263. The working window 263 has a window frame 265, an opening 264, a flange portion 261, and a cover 262. The opening 264 is provided in the side wall of the cylinder 26, which is a component of the raw stone injection device 203. A plurality of openings 264 are provided corresponding to the bolts 52 serving as the fixing operation means. The flange portion 261 is formed by fixing one side of an angle iron (i.e., an L-shaped angle material) to the outer peripheral surface end of the window frame 265. The other side of the flange portion 261 forms the flange portion of the window frame 265.

[0071] FIG. 9 shows a part of the planar cross-sectional structure of the raw stone throwing device 203 along the arrow DD line in FIG. 8. FIG. 11 shows a part of the side structure of the cylinder 26 along the arrow C in FIG. 9. The opening 264 is surrounded by a window frame 265 as shown in FIG. 11, and its planar shape is formed into a rectangular shape. The window frame 265 is formed as a cylinder with a square planar cross section. This cylinder extends in a direction penetrating the paper surface of FIG. 11. The flange portion 261 is formed so as to have a rectangular frame shape at the end of the window frame 265. The flange portion 261 has a plurality of screw holes 269 arranged in a straight line at a predetermined interval.

[0072] The lid 262 in Fig. 8 is formed of a rectangular plate material as shown in Fig. 10. The lid 262 can be formed of, for example, an iron plate having a thickness of 9 mm to 12 mm. A plurality of screw holes 270 are provided linearly at appropriate intervals around the periphery of the lid 262. The lid 262 in Fig. 10 is attached to the surface of the flange portion 261 with the screw holes 270 aligned with the screw holes 269 on the flange portion 261 side shown in Fig. 11. Note that the lid 262 is not shown in Fig. 11 to make the explanation easier to understand.

[0073] 8 and 9, the lid 262 is fixed to the surface of the flange 261 by passing a screw 275 through a screw hole 269 (see FIG. 11) and a screw hole 270 (see FIG. 10) and further tightening the screw. The lid 262 can be removed from the flange 261 by removing the screw 275 from the screw holes 269 and 270.

[0074] In this embodiment, when replacing the seal member 47 in FIG. 8, for example, (1) The bolts 72 and nuts 73 connecting the upper protector 71a and the lower protector 71b are loosened, and the lower protector 71b is removed from the upper protector 71a. This ensures a working space around the seal member fixing structure 50. (2) Next, the bolts 52 that secure the seal member 47 are loosened, and the old seal member 47 is replaced with a new seal member 47. (3) The position of the new seal member 47 after replacement is adjusted from the outside of the working window 263 with the cover 262 removed.

[0075] 8, head portion 52a, which is the operated portion of bolt 52 serving as fixing operation means, is located in an outer region than the main body portion (i.e., the threaded portion) of bolt 52 inside cylindrical body 26. Therefore, an operator can perform the position adjustment and replacement operations of seal member 47 very easily, compared to the conventional case in which head portion 52a was located in a deep region of cylindrical body 26.

[0076] Furthermore, since a working window 263 is provided in the cylinder 26 near the head portion 52a, the worker can simply remove the cover 262 of the working window 263 from the flange portion 261 of the window frame 265 to open the opening 264 (i.e., open the opening 264 to the outside), and then immediately perform operations on the head portion 52a, which is the part to be operated. Therefore, work can be performed simply, quickly and comfortably.

[0077] Furthermore, since the head portion 52a as the operated portion is located in the outer region of the cylinder 26, i.e., in the region outside the protector 71, the protector 71 prevents the raw material undergoing the firing process from colliding with the head portion 52a. This eliminates the need to use a bolt cover to cover the head portion 52a. This allows for reduced parts and labor costs compared to using a bolt cover.

[0078] (Other embodiments) Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments and can be modified in various ways within the scope of the invention described in the claims.

[0079] For example, in the embodiment described above, the bolt 52 is used as the fixing operation means, and the head portion 52a is used as the operated part. However, the fastening structure for fixing the seal member 47 to the seal ring 51 in Fig. 3 may adopt any structure other than the fastening structure by the combination of a bolt and a nut. In that case, the operated part is a member that is operated by an operator, and a member specific to the fastening structure to be adopted is selected and used.

[0080] In the embodiment of Fig. 1, the ore charging device of the present invention is applied to a Beckenbach furnace with a suspended inner cylinder. However, the present invention can also be applied to a Beckenbach furnace with a freestanding inner cylinder. The present invention can also be applied to vertical furnaces other than the Beckenbach furnace. [Explanation of symbols]

[0081] 1: vertical furnace, 2: furnace body, 3: raw ore charging device, 4: outer cylinder, 6: inner cylinder, 7a, 7b: bridge, 8: fixed table, 9: paddle, 12a: first burner, 12b: second burner, 13: injector, 14: recuperator, 15: hopper, 16: exhaust fan, 17: dust collector, 18: combustion air fan, 19: inner cylinder cooling fan, 22: intermediate inlet, 26: cylinder, 27: raw ore charging pipe, 28: conveyor, 29: raw material hopper, 31: first expansion section, 32: intermediate section, 33: second expansion section, 34: rotating shaft, 36: paddle, 37: sprocket, 38: shaft member, 39: wire, 41: weight, 42: sealing cover, 43: Hydraulic cylinder, 44: Sealing device, 46: Insertion lid, 47: Sealing member, 47a: Sealing member piece, 50: Seal member fixing structure, 51: Seal ring (fixing operation means), 51a: Flange, 52: Bolt (fixing operation means), 52a: Head portion (operated portion), 53: Nut (fixing operation means), 54: Pressing plate (fixing operation means), 54a: Member (pressing plate piece), 57: Bolt (seal ring fastening means), 58: Nut (seal ring fastening means), 59: Long hole, 63: Working window, 64: Opening, 65: Window frame, 66: Door, 67: Hinge, 68: Handle, 71: Protector, 71a: Upper protector, 71b: Lower protector, 71c: Protector piece, 72: Bolt, 73: Nut, 74: Tool (spanner), 203: Raw stone charging device, 261: Flange portion, 262: Lid, 263: Working window, 264: Opening, 265: Window frame, 269: Screw hole, 270: Screw hole, 275: Screw, A1: Preheating zone, A2: Firing zone, A3: Cooling zone, L0: Length of sealing member, L1: Length of step portion, L2: Length of pressing plate, t0: Thickness of sealing member, X0: Central axis, W0: Width of sealing member, W1: Width of pressing plate

Claims

1. A raw material charging device for supplying raw materials to a vertical furnace body, A cylinder into which the raw material is introduced; A seal member attached to an inner wall of the cylindrical body; a seal member fixing means capable of fixing the seal member to the cylindrical body in a fixed position and releasing the fixing; a sealing lid provided inside the cylindrical body and movable between a position where it abuts against the fixed sealing member and a position where it is separated from the fixed sealing member; having the released sealing member is movable along a moving direction of the sealing lid, the seal member fixing means is capable of fixing the moved seal member at the moved position, In the raw material charging device, the raw material is supplied to the furnace body through a space formed between the sealing lid and the sealing member when the sealing lid is separated from the sealing member, The seal member fixing means is a fixing operation means that is operated to fix the seal member to the cylindrical body, The fixing operation means has an operated portion which is a portion that receives an operation, the operated portion is located in an area outside the main body of the fixing operation means inside the cylindrical body, The cylindrical body has an opening at a position corresponding to the operated portion, The raw stone input device has an opening / closing member for opening and closing the opening. A raw stone input device characterized by the above.

2. the fixing operation means is a bolt that presses the seal member against the cylindrical body to fix it; The operated portion is a head portion of a bolt, The operated part is operated through the opening.

2. The ore charging device according to claim 1,

3. The sealing member is arranged in a cylindrical shape by connecting a plurality of sealing member pieces together, The opening is disposed at a position corresponding to the seal member piece.

2. The ore charging device according to claim 1.

4. A protector is provided on the inside of the seal member to prevent the raw material introduced into the cylinder from hitting the seal member.

2. The ore charging device according to claim 1.

5. The protector has an upper protector and a lower protector, the upper protector is fixed to the inner surface of the cylindrical body, and the lower protector is removably attached to the upper protector.

5. The ore throwing device according to claim 4.

6. The protector is arranged in a cylindrical shape by connecting a plurality of protector pieces together, The opening is disposed at a position corresponding to the protector piece.

5. The ore throwing device according to claim 4.

7. 2. The rough stone throwing device according to claim 1, wherein the opening and closing member is a door that opens and closes the opening by pivoting.

8. 2. The ore throwing device according to claim 1, wherein the opening and closing member is a lid that can be attached to and detached from the opening.

Images