Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
  • F27B19/00—Combinations of different kinds of furnaces that are not all covered by any single one of main groups F27B1/00 - F27B17/00
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D99/00—Subject matter not provided for in other groups of this subclass
  • F27D99/0073—Seals
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
  • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
  • F27B21/06—Endless-strand sintering machines
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D1/00—Casings; Linings; Walls; Roofs
  • F27D1/18—Door frames; Doors, lids or removable covers
  • F27D1/1858—Doors
  • F27D2001/1875—Hanging doors and walls
  • F27D2001/1883—Hanging curtains
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D3/00—Charging; Discharging; Manipulation of charge
  • F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
  • F27D2003/0036—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities comprising inflatable or extendable parts

Definitions

• the present invention relates to a method for producing a sintered ore for a blast furnace, and relates to a sealing device and a sealing method for a pressurized blower fan in a sintering facility.
• the compounded raw material is charged from the raw material hopper 5 to the endless pallet 1 and ignited in the upper part of the raw material packed bed 2 by the ignition furnace 6, and the wind box 8
• the exhaust duct 9 and the exhaust gas dust collector 10 suck the gas downward through the exhaust blower 11, and the compressed air blower fan 3 connected to the gas pressurized blower blower 4 connects the raw material storage layer 2 to the pressurized blower fan 3.
• There is a pressure sintering method in which gas is blown to the upper part and the pallet 1 is moved, so that it is fired sequentially from the upper layer to the lower layer.
• the suction pressure of the wind box 8 is set to ⁇ 9.8 kPa ( ⁇ 100 OmmAq) with respect to the atmospheric pressure, and the atmosphere is sucked, and the combustion melting
• ⁇ 9.8 kPa ⁇ 100 OmmAq
• the pressure sintering method can greatly improve the sintering machine production rate, product yield, and sinter quality.
• the pallet group swings up and down, left and right, and the thermal expansion during passing through the ignition furnace and firing. This is because sufficient sealing technology has not been established since it is necessary to design in consideration of the influence of the seal.
• Japanese Utility Model Application Laid-Open No. 6-141-700 mentions that the seal piece moves while following the vertical movement of the upper surface of the sintered ore, and the seal body expands and contracts following the vertical movement of the seal piece. By doing so, the outer periphery of the hood can be sealed. " However, in this method, it is difficult to seal a part of the corner between the pallet moving direction and the width direction, and the equipment becomes large.
• Each of the above-mentioned conventional techniques is a mechanism in which sliding occurs between the seal piece and the sintered ore or the seal piece. That is, as shown in FIG. 2, if there is no seal piece 14 between the lower end portion 13 of the skirt of the pressurized air blowing hood 3 and the raw material packed layer 2, the additional A large amount of gas leaks from the pressure blowing hood 3, the pressure in the pressure blowing hood 3 does not increase, and the blowing pressure required for the pressure sintering method cannot be obtained.
• the sintering machine operates continuously for 24 hours, and the seal pieces always slide with the hard sintered ore powder on the surface layer of the raw material packed bed. Due to the harsh conditions, it was difficult to obtain sufficiently durable (wear-resistant) seal pieces. Therefore, there has been a demand for the development of a revolutionary sealing technology that can seal even when sliding occurs and has no problem in durability.
• the present invention provides a pressurized air blower for a sintering facility which has a sealing property for enabling sufficient pressurized air to be blown from a pressurized air blower hood provided above a sintering pallet and has both durability and durability.
• An object of the present invention is to provide a single-sided sealing device and a sealing method. Disclosure of the invention
• the present invention solves the above technical problems, and the gist thereof is as follows.
• a rigid rigid body is provided at the lower end of the skirt of the pressurized blower hood.
• the width w of the sealing piece made of an elastic composite material in sliding contact with the surface layer of the sintering material-filled layer is expressed as a relative ratio (wZh) to the layer thickness h of the sintering material-filled layer.
• a pressure hood hood sealing device which is installed so as to fall within the range of 1-2.
• the seal piece is a composite material in which the hard rigid body is fixed to the surface of the elastic body such that the maximum horizontal diameter of the hard rigid body exposed from the surface of the elastic body is 50 mm or less.
• the sealing device for the pressurized air blowing hood according to the above (1) (3)
• the seal piece is a composite material in which the hard rigid body is fixed to the elastic body surface so that the horizontal rigidity of the hard rigid body exposed from the elastic body surface is 5 mm or more.
• the sealing device for a pressurized ventilation hood according to the above (1).
• the sealing piece is a composite material in which the hard rigid body is fixed to the surface layer of the elastic body such that the thickness of the hard rigid body exposed from the surface layer of the elastic body is 5 mm or less.
• the sealing device for a pressurized ventilation hood according to any one of 1) to (3).
• the thickness of the hard rigid layer composed of a spherical or cylindrical hard rigid body is 5 mm to 50 mm, and the above (1) to (6) ) Seal of the pressurized ventilation hood according to any one of
• a support member is installed at the lower end of the skirt of the pressurized air blowing hood, The upper end of the seal piece is fixed to the side wall of the holding member, and the lower end of the seal piece is connected to the bottom of the upper wall of the support member via a panel.
• the sealing device for a pressurized ventilation hood according to any one of 1) to (10).
• the rigid rigid body is in sliding contact with the sintering raw material-filled layer, and one end of the elastic body is fixed to the outside of a side wall provided on an upper wall of the support member.
• a support member is provided at a lower end of a skirt of the pressure blowing hood, and the seal piece is fixed to the support member via a bulk elastic body.
• the sealing device for the pressurized air blower hood according to any one of (1) to (o).
• the support member includes an upper wall provided at a lower end of the skirt and an upper wall of the support member, and includes an upper wall of the bulk elastic body and is fixed to the upper wall of the support member.
• the seal piece is such that the hard rigid body is afraid of the sintering material-filled layer, and an end of the elastic body constituting the seal piece is fixed to a side wall of the bulk elastic body.
• the seal piece is configured such that the hard rigid body comes into contact with the sintering material-filled layer, and an end of an elastic body constituting the seal piece is directly fixed to the support member.
• the air duct capable of adjusting the internal pressure is installed at the lower end of the skirt of the pressurized air blowing hood, and the seal piece is installed at the bottom of the air duct.
• the sealing device for a pressurized ventilation fan according to any one of (1) to (10).
• the air duct is provided on an upper wall portion of an air duct provided at a lower end portion of the skirt and an upper wall portion of the air duct for fixing an upper end portion of a bag-shaped seal piece to which air is supplied.
• a pressure hood sealing device is provided.
• the air duct is an upper wall portion of an air duct provided at a lower end portion of the skirt, and the air fixing an upper end portion of a bag-like seal piece to which air is supplied via an air tube.
• the seal piece is a composite material in which the hard rigid body is fixed to the elastic body surface so that the maximum horizontal diameter of the hard rigid body exposed from the elastic body surface layer is 50 mm or less.
• the seal piece is a composite material in which the hard rigid body is fixed to the surface layer of the elastic body such that the horizontal diameter of the hard rigid body exposed from the surface layer of the elastic body is 5 mm or more.
• the sealing method of the pressurized air blowing hood according to the above (22) o
• the seal piece is a composite material in which a hard rigid body is fixed to a surface layer of an elastic body such that a thickness of the hard rigid body exposed from the surface layer of the elastic body is 5 mm or less.
• the thickness of the rigid rigid body layer composed of a spherical or cylindrical rigid rigid body is 5 mm to 50 mm, wherein (21 :) The method for sealing a pressurized air blowing hood according to any one of claims to (26).
• a support member is installed at the lower end of the skirt of the pressurized air blowing hood, and the seal piece is installed on the support member via a bulky elastic body, and the seal is mounted on a side wall portion of the support member.
• FIG. 1 is a diagram showing an example of the pressure sintering method.
• FIG. 2 is a diagram showing an example of a conventional pressurized ventilation hood.
• FIG. 3A is a diagram showing an example of the state of the seal piece of the present invention.
• FIG. 3 (b) is an enlarged vertical sectional view taken along the line I-I of the lower part of FIG. 3 (a).
• FIG. 3 (c) is a ceramic portion which is a lower portion of FIG. 3 (a), and is a view taken along the line II-II of FIG. 3 (b).
• FIG. 3D is a diagram showing another example of the ceramic portion of FIG. 3C.
• FIGS. 3 (e) and 3 (f) are views showing another example of the state of the seal piece of the present invention, wherein a spherical and cylindrical ceramic 15a 'is equally applied to rubber 15b'.
• FIG. 3 is a diagram showing an example of the arrangement.
• FIG. 3 (g) is a diagram showing another example of the state of the seal piece of the present invention, and shows an example in which spherical and cylindrical ceramics 15a 'are randomly arranged on rubber 15b'.
• FIG. 3 (g) is a diagram showing another example of the state of the seal piece of the present invention, and shows an example in which spherical and cylindrical ceramics 15a 'are randomly arranged on rubber 15b'.
• FIG. 4 is a diagram showing an example of an embodiment of a sealing device for a pressurized air blowing hood of the present invention.
• FIG. 5 is a diagram showing an example of an embodiment of a sealing device for a pressurized air blowing hood of the present invention.
• FIG. 6 is a diagram showing an example of an embodiment of a sealing device for a pressurized air blowing hood of the present invention. is there.
• FIG. 7 is a conceptual diagram showing a gas flow in the vicinity of a sliding contact area between a seal piece in a pressurized air blowing hood and a sintering raw material packed bed.
• FIG. 8 is a graph showing the relationship between the sliding contact distance (w / h) of the seal piece and the air leakage rate 77 with respect to the thickness of the raw material packed layer in the present invention.
• FIG. 9 is a graph showing the relationship between the sliding distance (W / h) of the seal piece and the productivity P of the sintered ore with respect to the thickness of the raw material-filled layer in the present invention.
• the present inventors have proposed a method for sealing a gap between a lower end portion of a pressurized blowing fan provided above a sintering material packed layer and a sintering material packed layer in a pressure sintering method.
• the first function of the seal piece provided at the lower end of the skirt of the pressurized air blowing hood is as follows.
• the sintering raw material filling layer is formed.
• the purpose is to seal the gap between the pressurized air blower hood and the surface of the sintering raw material packed layer by making it possible to sufficiently follow the unevenness on the surface and to always keep the sliding contact.
• the second function of the seal piece is to maintain durability against abrasion during sliding contact with the surface of the sintering material-filled layer.
• seal pieces have often used rubber or other elastic materials as their material in order to satisfy the former function.
• the surface layer of the sintering material-filled layer that is in sliding contact with the seal piece is a very hard powder layer made of unburned sintered ore powder and the like, and has a sharp end.
• the hardness is higher than at least the sintered ore powder in the surface layer of the sintering material packed bed.
• Ceramics and the like are known as materials having excellent wear properties.However, when only such a hard material is used as the material of the sealing piece, irregularities on the surface of the sintering material-filled layer when the sintering material moves. (Height: about 30 to 50 mm, cycle: about 500 to 200 mm), cannot maintain sufficient sealing performance, and has poor impact resistance. There is.
• the inventors of the present invention have conducted intensive studies on a material that satisfies both the properties of sealing and abrasion resistance as seal pieces.
• a material that satisfies both the properties of sealing and abrasion resistance as seal pieces By using a composite material of a hard rigid body and an elastic body, which is bonded to an elastic body by vulcanization or the like, as the material of the seal piece, the abrasion resistance is improved while maintaining the same sealing performance as the conventional seal piece. It was found that it could be significantly improved.
• seal pieces are placed so that the chip (ceramic 15a ') slides on the surface of the sintering material-filled layer.
• the chip is bonded to an elastic body such as rubber 15b 'by vulcanization or the like to form a sheet (seal piece) as shown in Fig. 3 (b).
• the sheet may be adhered to the base rubber processed into the required structure by vulcanization or the like.
• the arrangement may be a lattice shape as shown in FIG. 3 (c) or a staggered shape as shown in FIG. 3 (d), and the arrangement is not limited as long as the elasticity required for operation is provided.
• the thickness of the hard rigid body exposed from the elastic body be 5 mm or less. If it is more than this, the adhesive strength is weak and it is easy to peel off. Rather, it is preferable that the elastic body is filled up to the joints between the ceramics, that is, the surface layer of the hard rigid body, as shown in FIG. 3 (b).
• the shape, material, and the like of the chip can be a plurality of combinations, and the design may be made based on the unevenness and sealing property of the surface layer of the sintering material-filled layer.
• the present invention has been made based on the above findings, and is directed to a sealing device for a pressurized air blowing hood provided above a sintering material packed bed inserted in a downward suction type sintering machine.
• the width direction distance w in which a sealing piece made of a composite material of a hard rigid body and an elastic body is slid on the surface layer of the sintering material packed layer is determined by the thickness h of the sintering material packed layer.
• the relative ratio (wZ h) is set in the range of 0.1 to 2.
• the wear resistance can be remarkably improved as compared with the related art.
• the distance in the width direction at which the sealing piece 15 slides on the surface of the sintering material-filled layer (sliding contact) It is not necessary to install the seal pieces 15 so that the distance w is within a predetermined range in relation to the thickness h of the sintering raw material-filled layer 2.
• Fig. 8 is a graph showing the relationship between the sliding distance (wZh) of the seal piece and the air leakage rate with respect to the thickness of the raw material layer
• Fig. 9 is the sliding distance (w / h) and the productivity P of the sinter are shown in the graphs respectively.
• the productivity P (%) shown in Fig. 9 is the relative ratio to the maximum value of the sintering production rate when the pressure blast sintering operation is performed under the same conditions except for the sliding distance of the seal pieces ( %).
• FIG. 7 is a conceptual diagram showing the gas flow (20, 21) near the sliding contact area between the seal piece 15 and the sintering material packed bed 2 in the pressurized ventilation hood.
• the flow of gas in the vicinity of the sliding contact area of the seal pieces 15 in the pressurized blast hood has a lower gas flow 21 depending on the layer thickness h of the sintering raw material packed layer 2 and a pressure loss ⁇ 1 of 1 Depends on the contact distance w
• the gas flow in the width direction in the width direction is determined by the relationship with the pressure loss ⁇ 2 at 20:00, and when the sliding distance w is sufficiently long, ⁇ 1 ⁇ ⁇ 2, the sliding contact of the seal pieces 15
• the gas flow near the region flows downward (no apparent air leakage) and becomes gas flow 21.
• the sealing performance of the pressurized air blower hood is extremely reduced (leakage rate 7? Increases), and the productivity P of the sinter decreases to less than 95%.
• the sliding distance w of the seal piece exceeds 2 in relative ratio (w / h) to the layer thickness h of the sintering raw material, gas flow in the width direction of the sliding contact area of the seal piece disappears, and the sealing performance is good.
• the width direction distance (sliding distance) w at which the seal piece made of the composite material of the hard rigid body and the elastic body slides on the surface layer of the sintering raw material packed layer is defined as
• the relative ratio (wZh) of the layer thickness to the layer thickness h is specified in the range of 0.1 to 2.
• the sealing piece made of a composite material of a hard rigid body and an elastic body in the present invention is obtained by, for example, bonding a large number of hard rigid chips to an elastic body by vulcanization or the like.
• the hard rigid body in the present invention is a material having a higher hardness and a higher wear property than at least the sintered ore powder of the surface layer portion of the sintering raw material-filled layer, and includes, for example, ceramic, high Cr steel and Cr— Hard metals such as Ni alloys, and summaries such as WC-Co alloy and WC-NiCr alloy are used.
• the elastic body according to the present invention is provided with irregularities (height: about 30 to 50 mm, period: about 500 to 2000 mm) on the surface of the sintering material packed layer when the sintering material moves.
• irregularities herein.
• rubber such as natural rubber, urethane rubber, NBR rubber, CR rubber, and cloth-reinforced rubber is used.
• Examples of a composite material of a hard rigid body and an elastic body include commercially available Bercela sheets (trade name, manufactured by Nippon Tsusho Corporation), gum sera sheets (trade name, manufactured by Santo Kagaku Co., Ltd.), KR Ceramic and rubber composites such as Cerasheet (trade name, manufactured by Kawamoto Kogyo Co., Ltd.) are generally known.
• the shape of the hard rigid chip fixed to the elastic body is not particularly limited, and may be any shape such as a plate, a sphere, and a cylinder.
• the maximum diameter exposed from the surface layer of the elastic body exceeds 50 mm, the elasticity of the seal piece decreases, and the seal piece is sintered.
• the maximum diameter of the hard rigid chip exposed from the surface layer of the elastic body is specified to be 50 mm or less because the sealing property with the surface layer of the material-filled layer is reduced.
• the size of the hard rigid tip is preferably the longest part of the length, width, and height, that is, the major axis is 5 mm or more. If it is smaller than this, the adhesion area between the ceramic and the rubber will be small, and the ceramic will soon peel off, resulting in poor durability. [However, the smaller the better, in terms of sealing (elasticity). In addition, the number of ceramics increases in production, making it difficult and the cost increasing sharply.
• the thickness of the plate-shaped hard rigid chip is preferably 1 mm to 10 mm. If it is less than 1 mm, the hood is pressed from above and the sealing piece is manually moved, so it will break. Furthermore, when rubber joints are provided between the ceramics, the adhesiveness is inferior due to the lack of thickness. If it exceeds 10 mm, the elasticity of the composite material is reduced, so that the sealing property at the surface layer is inferior. However, when a projection is provided on the tip to prevent falling off, the height of the projection is not included in the thickness of the hard rigid tip.
• the distance between the plate-shaped hard rigid chips is preferably 0 mm to 3 mm. There is no lower limit for the interval. That is, there is no rubber joint between the ceramics, and the side surfaces of the ceramics may directly contact each other. If it is more than 3 mm (although it has good elasticity), the extruded rubber will be immediately scraped and the adhesive strength will be reduced, and the sintered ore powder will accumulate between the ceramics and peel off from that part as a starting point. .
• the thickness of the plate-like elastic body is preferably 2 mm to 20 mm excluding the thickness of the ceramic (joint portion). If it is less than 2 mm, the strength of the elastic body itself is weak, and it will be broken during operation. If it exceeds 20 mm, the elastic body becomes hard and cannot follow the unevenness of the surface layer.
• a shape having a projection for preventing falling off is preferable.
• the shape of the projection is not particularly limited, and may be any shape such as a rail shape, a cylindrical shape, and a trapezoidal shape.
• the size (thickness) of the hard rigid tip is the longest diameter in the case of a spherical shape, the longest diameter or height of the bottom or top surface in the case of a cylindrical shape, that is, the longest diameter of the spherical or cylindrical shape is 5 to 50 mm. preferable.
• the reason is the same as in the case of the plate chip.
• the spacing between the hard and rigid tips is preferably evenly distributed between 0 mm and 3 mm as shown in FIGS. 3 (e) and 3 (f). The reason is the same as in the case of the plate chip. Alternatively, they may be arranged randomly as shown in FIG. Is the exposed thickness of the chip (ceramic 15a '), 12 is the thickness of the chip layer, and t3 is the thickness of the elastic body.
• the thickness of the elastic body is preferably 2 mm to 20 mm except for the thickness portion (joint portion) of the ceramic. The reason is the same as in the case of the plate chip.
• the thickness of the hard rigid chip layer is preferably 5 mm to 50 mm. If it is less than 5 mm, the chip size is not possible in terms of adhesiveness, manufacturability, etc., and if it is more than 50 mm, it becomes hard and inferior in elasticity.
• the elastic body also enters the thickness portion of the ceramic (between the ceramics) from the viewpoint of adhesiveness.
• the seal piece 14 in the conventional sealing device shown in FIG.
• the seal piece 15 made of the above composite material By simply replacing the seal piece 15 made of the above composite material, the seal piece can be in close contact with the surface layer of the sintering raw material packed layer 2 and sealed by the positive internal pressure of the blower hood 3.
• the lower end 15c of the seal piece can be fixed with a wire or a panel 16 as shown in FIG. 4 in order to prevent the seal piece from being turned outward when the seal piece slides.
• FIG. 4 shows an example of an embodiment of the present invention, in which a supporting member 19 is provided at a lower end portion 13 of a skirt of a pressurized air blowing hood, and an outer end portion of the supporting member 19 (an upper wall portion of the supporting member 19).
• the upper end of the sealing piece 15 made of a composite material of ceramic and rubber is fixed to the side wall 19b) provided on the 19a, and the inside of the supporting member 19 (the bottom 19c of the supporting member 19) is fixed.
• a sealing device in which a lower end 15c of the seal piece 15 is connected to an end via a spring 16 is shown.
• connection position of the panel does not need to be limited to the inner end of the support member 19, but is a position in the width direction corresponding to a region w where the sealing piece 15 is in sliding contact with the surface layer of the sintering material-filled layer 2. May be provided in parallel.
• the sealing piece 15 of the present invention is connected to the supporting member 19 provided at the lower end 13 of the skirt 13 of the pressurized air blowing hood via the panel 16, the sealing is achieved by the expansion and contraction of the panel 16.
• the sintering material-filled layer 2 of the pieces 15 is improved, and the sealing property can be more stably maintained.
• FIG. 5 shows an example of an embodiment of the present invention.
• a sealing device is shown in which a support member 19 is installed in a part 13 and a seal piece 15 made of a composite material of ceramic and rubber is fixed to the support member 19 via a bulk elastic body 17.
• the bulk elastic body 17 does not need to be particularly limited, and sponge-like rubber, a tube internally pressurized by gas or liquid, or a flexible metal body such as a bellows-shaped metal body is used.
• the sealing member 15 made of a composite material of a hard rigid body and an elastic body of the present invention is bonded to at least the lower surface of the sintering raw material-filled layer 2 which is in sliding contact with the surface of the sintering raw material-filled layer 2 to be fixed to the support member 19.
• seal piece may be directly fixed to the support member, and the elastic body and the seal piece may not be bonded.
• the size of the bulk elastic body is determined by (w / h), which is defined by the sealing performance and productivity.
• w / h which is defined by the sealing performance and productivity.
• the vertical direction it is only necessary that the unevenness of the surface layer of the sintering raw material filling layer 2 can be absorbed. If the surface irregularity is ⁇ , the vertical length is 2 _ ⁇ ⁇ 1. If it is less than 2 _g, irregularities cannot be absorbed, and if it is more than 10 £, the sealing piece becomes unstable, causing problems such as peeling off from the portion fixed to the support member.
• the seal piece 15 of the present invention by connecting the seal piece 15 of the present invention to the supporting member 19 provided at the lower end portion 13 of the skirt of the pressurized blower hood via the bulk elastic body, the elasticity of the bulk elastic body is improved. Due to the properties, the followability of the seal pieces 15 to the surface layer of the sintering material-filled layer 2 is improved. The sliding property is improved, and the sealing property can be more stably maintained. If sponge-like rubber is used as the bulk elastic body,
• chloroprene rubber ethylene propylene rubber, nitrile rubber, natural / isoprene rubber, styrene-butadiene rubber, and other generally known rubber materials can be used. It is preferable to use one having a hardness of 8 and
• an air duct 18 capable of adjusting the internal pressure is installed at the lower end 13 of the skirt of the pressurized air blowing hood.
• a sealing device in which a sealing piece 15 made of a composite material of ceramic and rubber according to the present invention is installed at the bottom 18c of the duct 18 is shown.
• the sealing device when an internal pressure is applied by supplying an air from above the air duct 18 into the duct, the sealing piece 15 expands like a tire tube, and the sealing piece 15 and the sintering material The adhesion of the packed layer 2 to the surface layer is further improved. Further, in the present invention, the sealing device is used to adjust the amount of air supplied into the air duct 18 to control the internal pressure, and to seal the sealing piece 15 with the surface layer of the sintering material-filled layer 2. To improve the sliding contact of the seal pieces 15 by absorbing uneven and irregular asperities on the surface layer of the sintering raw material packed layer 2, thereby improving the sealing performance. ⁇ can improve durability (wear resistance)
• the size is determined in the same manner as the bulk elastic body.
• a tube-shaped rubber is provided in the (air) duct 18 and air is supplied into the tube-shaped rubber.
• air is supplied into the tube-shaped rubber.
• an internal pressure of 0.49 kPa to 19.6 kPa (0. OOS k gZcn ⁇ O. 2 kgZcm 2 )
• a part of the sealing piece 15 becomes Prevents a decrease in internal pressure in the air duct 18 in case of breakage, and enables stable internal pressure control.
• FIGS. 4 to 6 are schematic diagrams showing, as an example of the embodiment of the present invention, a seal piece 15 according to the present invention installed at a lower end 13 of a skirt on a side surface of a pressurized air blower hood 3.
• a magnet is further installed above the sealing piece 15, and the sintered ore powder of the surface layer of the raw material packed layer 2 is fixed to the surface of the sealing piece 15 by magnetic action, and the sealing piece is fixed. Increase the adhesion between 15 and the sintering material packed layer 2 Furthermore, it is possible to improve the sealing performance.
• the suction negative pressure was 12.74 kPa (1) using a sintering machine having a sintering pallet width of 4 m and a sintering machine length of 100 m. 300 mmAq), the layer thickness h of the raw material packed bed is 55 Omm.
• the let speed was 3.5 mZs-the operation was constant.
• the pressurized air hood is 3.5 m wide and 30 m long.
• the distance (height) between the lower end of the skirt and the surface layer of the raw material bed is 20 Omm. It was installed above the sintered strand. Blowing amount of pressurized pumping air hood or colleagues and 8.
• the sealing device 14 of the pressurized air blowing hood 3 has a structure as shown in FIG. 4, and as shown in FIGS. 4 and 3 (a) to (c), a composite of ceramic and rubber is used.
• a composite piece of ceramic and rubber with a total thickness of 5 mm obtained by vulcanizing a large number of 2 mm thick ceramic chips into a natural rubber sheet with a horizontal cross-sectional shape of 1 Omm square as a sealing piece 15 made of material A material sheet was used. The spacing between the ceramic chips was 1 mm.
• the bottom portion 19c of the upper wall portion of the support member 19 and the lower end portion 15c of the seal piece 15 were connected by a spring 16 at an interval of 30 Omm in the longitudinal direction of the pressure blower hood.
• the width w (sliding distance) at which the sealing piece 15 slides on the surface of the sintered material-filled layer 2 is 20 Omm [sintering distance].
• the relative ratio (wZh) to the layer thickness h of the consolidated raw material packed layer was set to 0.36]. Seal pieces 15 were placed around the entire hood.
• the sealing device for the pressurized air blowing hood 3 has a structure as shown in FIG. 5, and the height of the U-shaped support member (side wall portion 19b) is 50 mm.
• the width (upper wall portion 19a) was set to 200 mm, and seal pieces 15 were installed on the entire circumference of the hood.
• the same sealing piece 15 as that of Example 1 of the present invention was used as the sealing piece 15 made of a composite material of ceramic and rubber, and the sealing piece 15 bonded to the surface layer of the sponge rubber 17 was fixed to the supporting member 19. .
• the sponge rubber was fixed over the entire circumference of the hood below the support member 19 so that the distance (height) between the lower end of the skirt and the surface layer of the sintering material-filled layer was 200 mm. .
• the width w (sliding distance) at which the sealing piece 15 slides on the surface layer of the sintering material-filled layer 2 is 200 mm [in terms of the relative ratio (wZh) to the layer thickness of the sintering material-filled layer. 0.36].
• the sealing device of the pressurized air blowing hood 3 has a structure as shown in FIG. 6, and a sealing piece 15 made of a composite material of ceramic and rubber has a horizontal sectional shape of 5 mm on a side, A ceramic-rubber composite sheet with a total thickness of 5 mm obtained by vulcanizing a large number of ceramic chips of 10 mm or 60 mm square with a thickness of 2 mm into a natural rubber sheet was used. The spacing between the ceramic chips was 1 mm. The seal pieces were installed all around the hood.
• the end of the seal piece was fixed to the bottom opening 18 b of the air duct 18.
• the inside of the air duct 18 is sealed, and air is supplied from the upper part (air supply section 18 d) to reduce the internal pressure of the air duct 18 to 4.9 kPa (0.05 kgZcm 2 ).
• the width w (sliding distance) at which the sealing piece 15 slides on the surface layer of the sintering material filling layer 2 is 100 Omm, 180 mm or 200 mm. (Relative ratio wZh to the thickness of the sintering raw material-filled layer was 0.18, 0.33, or 0.36).
• the sealing device of the pressurized air blowing hood 3 was configured as shown in FIG. 2, and a 3 mm thick cloth-containing urethane rubber was used as the sealing piece 14. At this time, the lower end of the seal piece 14 was pulled inward with a string so that the seal piece 14 was not turned outward.
• urethane rubber is a material having better wear resistance than the NBR rubber used for the sealing piece 15 in Examples 1 to 6 of the present invention described above.
• the width w (sliding distance) at which the sealing piece 14 slides on the surface layer of the sintering raw material-filled layer 2 is set to 200 mm. 0.36] in contrast (wZh).
• Example 2 In Comparative Example 2, all were the same as Example 3 of the present invention except for the sliding contact distance w of the seal pieces 15.
• the sliding distance w of the sealing piece 15 is 30 mm [0.05 in relative ratio (wZh) to the layer thickness h of the sintering raw material-filled layer], which is shorter than the range of the present invention. did.
• Example 3 In Comparative Example 3, all were the same as Example 3 of the present invention except for the sliding contact distance w of the seal pieces 15.
• the sliding distance w of the sealing piece 15 is 1400 mm longer than the range of the present invention [2.54 in relative ratio (wZh) to the layer thickness h of the sintering raw material packed layer]. It was made to become.
• Table 1 shows the air leakage rate and life from the pressurized air hood when the sealing devices of Examples 1 to 6 and Comparative Examples 1 to 3 of the present invention were used.
• the sealability of the pressure blower hood provided above the sintering material packed layer charged in the sintering pallet is maintained and the durability is improved. It is possible to provide a sealing device and a sealing method for a pressurized air blowing hood, which has a remarkable effect that the productivity, product yield, and product quality of sintered ore can be improved by the pressure sintering method as compared with the related art.

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• 2001
  • 2001-01-12 JP JP2001004454A patent/JP3990540B2/ja not_active Expired - Fee Related
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  • 2001-03-13 EP EP01912290A patent/EP1195565B1/en not_active Expired - Lifetime
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  • 2001-03-13 BR BRPI0105092-3A patent/BR0105092B1/pt not_active IP Right Cessation
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  • 2001-03-13 WO PCT/JP2001/001937 patent/WO2001069153A1/ja active IP Right Grant
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