Apparatus for detecting surface profile of blast furnace load

Abstract

To detect a surface profile of a charged material by preventing the entry of a charged material suspending in a blast furnace into a device and accurately and stably transmitting and receiving a detection wave.SOLUTION: A detection device transmits a detection wave toward a surface of a charged material accumulated in a blast furnace 1 through an opening part 2 of the blast furnace to which the charged material, such as iron ore, coke, and lime is supplied, receives a detection wave reflected on the surface of the charged material, and detects a surface profile of the charged material. The detection device includes: a rotary plate 120 that rotates in parallel with the opening part 2; an angle variable reflection plate 140 and an angle fixed reflection plate 138 mounted on the rotary plate 120; an antenna 135 which transmits a detection wave to the angle fixed reflection plate 138; a sealing box 200 which surrounds the antenna 135, the angle variable reflection plate 140 and the angle fixed reflection plate 138; and a purge gas injection device 220 which injects a purge gas toward a bottom surface 201 of the sealing box 200.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a detection device for detecting the surface profile of iron ore, coke, limestone, etc. (hereinafter collectively referred to as "burden") in a blast furnace. [Background technology]

[0002] In a blast furnace, by optimizing the burden material deposition state and stabilizing the gas flow in the furnace, it is possible to reduce fuel costs and extend the life of the furnace body. In order to obtain an appropriate deposition state, it is necessary to accurately measure the surface profile of these burden materials in a short time and replenish the burden material so as to obtain a theoretical deposition state, i.e., a "theoretical deposition profile," which has been obtained in advance.

[0003] In order to detect the surface profile of such a charge in a blast furnace, the present applicant has also previously proposed a detection device shown in Patent Document 1. The detection device described in Patent Document 1 uses a variable-angle reflector in which the inclination angle of the reflecting surface of the detection wave toward the blast furnace side is variable, and a fixed-angle reflector, and the variable-angle reflector and the fixed-angle reflector are attached to a rotating plate that rotates horizontally with the opening of the blast furnace, and the surface profile of the charge accumulated in the blast furnace is quickly detected in a linear or planar manner by rotating the rotating plate. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6857933 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the above-mentioned detection device is attached to an opening formed in the blast furnace, and the antenna, variable angle reflector, and fixed angle reflector are exposed to the opening. Therefore, there is a risk that the charge floating in the blast furnace may enter the device through the opening and adhere to the antenna, variable angle reflector, and fixed angle reflector, adversely affecting the transmission and reception of the detection wave. Therefore, it is possible to periodically stop the operation of the detection device and clean the antenna and reflector, but this would stop the operation of the blast furnace, reducing productivity.

[0006] The present invention has been made in consideration of the above circumstances, and aims to prevent the intrusion of charge materials floating in a blast furnace into the device, accurately and stably transmit and receive detection waves, and detect the surface profile of the charge materials. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a surface profile detection device for a charge in a blast furnace as described below. (1) A detection device for detecting a surface profile of a burden material such as iron ore, coke, and lime in a blast furnace, the detection device transmitting a detection wave toward a surface of the burden material accumulated in the furnace through an opening in the blast furnace and receiving the detection wave reflected by the surface of the burden material, a rotating plate disposed above the opening and rotating about the center of the opening; A rotating means for rotating the rotating plate; a cylindrical rotating shaft that is attached concentrically to the central opening of the rotating plate and that houses an antenna therein; a transmitting / receiving means that is installed above the end of the rotating shaft opposite to the opening and is connected to the antenna, and transmits and receives the detection wave linearly along a radial direction of the rotating plate; an angle-variable reflector attached to the rotating plate and disposed in a space between the rotating plate and the opening, the angle of the reflecting surface being variable; a fixed angle reflector attached to the rotating plate and disposed in a space between the rotating plate and the opening, the fixed angle reflector having a reflecting surface and adapted to transmit the detection wave from the antenna to the reflecting surface of the variable angle reflector; a sealing box attached to the rotary plate, extending from the rotary plate toward the opening and surrounding the angle-variable reflector and the angle-fixed reflector, and having a plate member whose bottom surface facing the opening is made of a heat-resistant material that is transparent to the detection wave, or a part of the plate member; a single or a plurality of purge gas ejection devices that eject a purge gas toward the bottom surface in a space between the bottom surface and the opening; A surface profile detection device for a blast furnace load, comprising: (2) A detection device for detecting a surface profile of a burden material such as iron ore, coke, and lime in a blast furnace, the detection device transmitting a detection wave toward a surface of the burden material accumulated in the furnace through an opening in the blast furnace and receiving the detection wave reflected by the surface of the burden material, the detection device comprising: a rotating plate disposed above the opening and rotating about the center of the opening; A rotating means for rotating the rotating plate; an antenna attached to the rotating plate and disposed in a space between the rotating plate and the opening; a transmitting / receiving means connected to the antenna for transmitting and receiving the detection wave linearly along a radial direction of the rotating plate; an angle-variable reflector attached to the rotating plate and disposed in a space between the rotating plate and the opening, the angle of the reflecting surface being variable; a fixed angle reflector attached to the rotating plate opposite the variable angle reflector, the fixed angle reflector having a fixed reflecting surface, and adapted to transmit the detection wave from the antenna to the reflecting surface of the variable angle reflector; a sealing box attached to the rotating plate, extending from the rotating plate toward the opening and surrounding the antenna, the variable angle reflector, and the fixed angle reflector, and having a plate member whose bottom surface facing the opening is made of a heat-resistant material that is transparent to the detection wave, or a part of the plate member; a single or a plurality of purge gas ejection devices that eject a purge gas toward the bottom surface in a space between the bottom surface and the opening; A surface profile detection device for a blast furnace load, comprising: (3) The surface profile detection device for materials loaded into a blast furnace according to (1) or (2) above, characterized in that the purge gas injection device is composed of a plurality of injection nozzles, and each of the injection nozzles has a different injection angle relative to the bottom surface. (4) The surface profile detection device for objects loaded into a blast furnace according to any one of (1) to (3) above, characterized in that the opening of the blast furnace is covered with a wire mesh. Effect of the Invention

[0008] In the surface profile detection device for charges inside a blast furnace of the present invention, the variable angle reflector, the fixed angle reflector, and the antenna arranged between the rotating plate and the opening of the blast furnace are surrounded by a sealing box, so that charges floating in the blast furnace do not enter the device. Moreover, the sealing box rotates together with the rotating plate, and the purge gas is injected from the purge gas injection device onto the sealing box, and the purge gas flows in a planar manner as the rotating plate rotates, so that the charges adhering to the bottom surface of the sealing box can be effectively removed.

[0009] In this way, it is possible to prevent the charge from the blast furnace from entering the device, and it is possible to remove the charge adhering to the bottom surface of the sealing box simultaneously with the rotation of the rotating plate, i.e., simultaneously with the surface profile detection operation, and the transmission and reception of detection waves can be performed accurately, stably and maintenance-free. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional view showing a first embodiment of an apparatus for detecting a surface profile of a charge in a blast furnace according to the present invention. [Figure 2A] FIG. 2A is a perspective view of the sealing box. [Figure 2B] FIG. 2B is a bottom view of the sealing box. [Diagram 3]FIG. 3A is a top view showing the purge gas ejection device, FIG. 3B is a side view thereof, and FIG. 3C is a diagram explaining the manner in which the purge gas is ejected onto the bottom surface of the sealing box. [Figure 4] FIG. 4 is a diagram showing the airflow of the purge gas at the bottom surface of the sealing box according to FIG. [Diagram 5] FIG. 5 is a cross-sectional view showing a second embodiment of the surface profile detection device for a charge in a blast furnace according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The present invention will now be described in detail with reference to the drawings.

[0012] [First embodiment] Fig. 1 is a cross-sectional view showing a first embodiment of a surface profile detection device for a blast furnace load (hereinafter, also referred to as a "detection device") of the present invention. For the detection device 100 shown in Fig. 1, the first embodiment of Patent Document 1 can be referred to.

[0013] As shown in Fig. 1, the detection device 100 is installed at an opening 2 near the top of a blast furnace 1. The detection device 100 includes a rotating plate 120 that rotates horizontally with respect to the opening 2 of the blast furnace 1 as indicated by the symbol Y, around a rotating shaft 110 installed above (directly above) the opening 2.

[0014] The rotating plate 120 is an annular disk with an opening in the center. The opening in the center of the rotating plate 120 is indicated by reference numeral 121.

[0015] The rotating shaft 110 is cylindrical, houses an antenna 135 inside, and is attached concentrically with the opening 121 of the rotating plate 120. The antenna 135 is connected to the transmitting / receiving means 130 of the detection wave M via a waveguide 133. The upper end portion of the waveguide 133 on the transmitting / receiving means 130 side of the connecting rod 114 is separated, so that the transmitting / receiving means 130 does not rotate. This separated portion is indicated by reference numeral 180, and the gap is set to be less than the wavelength of the detection wave M so that the detection wave M does not leak. The waveguide 133 is aligned with the axis of the rotating shaft 110. In addition, a dielectric lens 136 made of fluororesin or the like may be attached to the antenna surface of the antenna 135 in order to increase the directivity of the detection wave M. The dielectric lens 136 can also be used to handle millimeter waves as the detection wave M. Furthermore, by using a parabolic antenna or a Cassegrain antenna for the antenna 135, the overall vertical dimension of the detection device 100 in the figure can be reduced, and the dielectric lens 136 can be omitted.

[0016] A gear 112 is provided on the outer circumferential surface of the rotating shaft 110, and a gear 155 of a motor 113 (rotating means) is engaged with the gear 112. Therefore, by driving the motor 113, which is the rotating means, the rotating shaft 110 rotates as indicated by the symbol Y in the figure, and the rotating plate 120 rotates horizontally with respect to the opening 2 of the blast furnace 1 in the same direction as the rotating shaft 110.

[0017] In the space below the rotating plate 120 and between it and the opening 2 of the blast furnace 1, a fixed angle reflector 138 and a variable angle reflector 140 are arranged for transmitting and receiving detection waves M into the furnace.

[0018] The fixed angle reflector 138 is a reflector whose reflecting surface has a fixed inclination angle of 45°, and is composed of a first fixed angle reflector 138A, a second fixed angle reflector 138B, and a third fixed angle reflector 138C. The first fixed angle reflector 138A faces the antenna surface of the antenna 135 (dielectric lens 136 in the illustrated example) through the opening 121 of the rotating plate 120. The second fixed angle reflector 138B faces the first fixed angle reflector 138A, and the third fixed angle reflector 138C faces the second fixed angle reflector 138B. Therefore, as shown by the dashed line in the figure, the detection wave M transmitted from the antenna 135 is reflected by the first fixed angle reflector 138A and sent to the second fixed angle reflector 138B, and then reflected by the second fixed angle reflector 138B and sent to the third fixed angle reflector 138C. The light is then reflected by the third fixed angle reflector 138C and sent to the variable angle reflector 140.

[0019] These first fixed angle reflector 138A, second fixed angle reflector 138B, and third fixed angle reflector 138C are attached to a fixed member (not shown) that hangs down from the rotating plate 120 toward the opening 2 of the blast furnace 1. Alternatively, the first fixed angle reflector 138A, second fixed angle reflector 138B, and third fixed angle reflector 138C can be attached to a side wall 170 that extends from the rotating plate 120 toward the opening 2 of the blast furnace 1 and is attached to the periphery of the rotating plate 120.

[0020] Since the inside of the furnace is hot and contains dust and water vapor, it is preferable to use microwaves or millimeter waves as the detection wave M. In particular, millimeter waves are preferable because they have a shorter wavelength than microwaves and are highly directional.

[0021] The angle-variable reflector 140 is a reflector in which the inclination angle of the reflecting surface 140a can be changed in the direction indicated by the symbol X in the figure. In this angle-variable reflector 140, a first link 117a of a link mechanism 117 is fixed to the center of the surface (back surface) opposite to the reflecting surface 140a, and a second link 117b is connected to the first link 117a. In addition, a connecting rod 114 that penetrates the inside of the rotating shaft 110 through an opening 121 of the rotating shaft 110 is connected to the second link 117b, and a rack gear 118 is formed on the end of the connecting rod 114 opposite to the second link 117b.

[0022] The connecting rod 114 has an outer tube portion 114a having a waveguide 133 as an inner tube that connects the antenna 135 and the transmitting / receiving means 130, and a rack gear 118 is formed on the outer circumferential surface of the outer tube portion 114a. A gear 119 of a motor 125 meshes with this rack gear 118, and by driving the motor 125, the gear 119 rotates, which is converted into linear motion by the rack gear 118. An encoder 126 is connected to the motor 125, and the amount of rotation of the motor 125 and further the amount of rotation of the gear 119 are detected.

[0023] Furthermore, the connecting rod 114 has an intermediate portion 114b that extends toward the rotating plate 120 inside the rotating shaft 110 so as to avoid the antenna 135. The end of the outer tube portion 114a on the rotating shaft 110 side is bent outward, and the intermediate portion 114b is continuous with this bent portion.

[0024] Furthermore, the intermediate portion 114b has a lower end portion 114c that extends to the opening portion 2 of the blast furnace 1 through the opening 121 of the rotating plate 120. The lower end portion 114c is connected to a second link 117b of the link mechanism 117.

[0025] The connecting rod 114 is configured in this manner, and rotation is converted into linear motion by the rack gear 118 via the gear 119, so that the connecting rod 114 moves linearly to the side of the angle-variable reflector 140 or to the opposite side, as indicated by the symbol H in the figure.

[0026] Although not shown in the drawings, the portion of waveguide 133 on the antenna 135 side may be made free from rotating shaft 110 so that waveguide 133 does not rotate even when rotating shaft 110 rotates. In this way, there is also a method in which waveguide 133 is not divided by separation portion 180.

[0027] Alternatively, it is possible to provide an insertion hole having a diameter slightly larger than that of the waveguide 133 in the top plate 111 of the rotating shaft 110 so that the antenna 135 does not rotate even when the rotating shaft 110 rotates.

[0028] Support shafts 141, 141 protrude from both diametrical ends of the angle-variable reflecting plate 140, and the support shafts 141, 141 are attached to a support arm holding rod 145 so as to be freely rotatable.

[0029] When the connecting rod 114 moves toward the angle variable reflector 140 (descending in the figure), the reflecting surface 140a of the angle variable reflector 140 is inclined via the link mechanism 117 so as to face the inner wall of the blast furnace 1, and when the connecting rod 114 moves away from the angle variable reflector 140 (rising in the figure), the reflecting surface 140a of the angle variable reflector 140 is inclined via the link mechanism 117 so as to face the axis of the blast furnace 1. That is, by the descent and ascent of the connecting rod 114, the inclination of the reflecting surface 140a of the angle variable reflector 140 can be changed in the direction of the symbol X in the figure.

[0030] Accordingly, the detection wave M sent from the third fixed angle reflector 138C of the fixed angle reflector 138 to the variable angle reflector 140 is oscillated in the left-right direction in the figure as shown by the symbol Z, and is sent into the furnace in the form of a line along the radial direction of the rotating plate 120.

[0031] The detection wave M is reflected by the surface of the charge (not shown) accumulated in the furnace, travels along the same path as when it was transmitted, and is received by the transmitting / receiving means 130. The transmission and reception can be performed, for example, by the FM-CW method.

[0032] By transmitting and receiving this linear detection wave M while rotating the rotating plate 120 around the rotating axis 110, distance information in a circular scanning area covering the entire interior of the blast furnace 1, i.e., a surface profile over the entire surface of the charge, can be obtained.

[0033] Furthermore, a sealing box 200 is attached to the rotating plate 120, which extends from the rotating plate 120 toward the opening 2 of the blast furnace 1, surrounds the angle-variable reflecting plate 140 and the angle-fixed reflecting plate 138, and rotates in the Y direction together with the rotating plate 120. The sealing box 200 is, for example, a substantially cylindrical body with a part of the cylinder cut off, as shown in Fig. 2A, and a part or all of a bottom surface 201 (part in the illustrated example; see Figs. 2A and 2B) facing the opening 2 of the blast furnace 1 is a plate material 210 made of a heat-resistant material that transmits the detection wave M. The plate material 210 can be a ceramic plate, a glass plate, or the like. Although not shown in the drawings, the sealing box 200 may be a generally cylindrical body with no cut-out portions, in addition to the roughly cylindrical body shown in FIG. 2A.

[0034] When a part of the bottom surface 201 of the sealing box 200 is made into the plate material 210, for example, as shown in Figures 2A and 2B, an opening 202 having a track-like and rectangular planar shape is formed in the bottom surface 201 along the radial direction, and the plate material 210 is attached so as to close the opening 202. In addition, the radial length L of the opening 202 is set corresponding to the amplitude in the Z direction of the detection wave M shown in Figure 1. For example, when the detection wave M scans linearly from the side wall of the blast furnace 1 beyond the center of the blast furnace 1, the opening 202 in the bottom surface 201 is also formed in a track shape including the center C of the bottom surface 201 accordingly.

[0035] Alternatively, although not shown, the opening 202 may be a track-shaped rectangular opening that extends over almost the entire diameter of the bottom surface 201 .

[0036] The peripheral walls of the sealing box 200 are made of metal, and compared to the case where the entire bottom surface 201 is made of plate material 210 such as a ceramic plate or a glass plate, the strength of the entire sealing box is increased by making only a part of the bottom surface 201 out of plate material 210 such as a ceramic plate or a glass plate and making the rest out of the same metal as the peripheral walls.

[0037] By using such a sealing box 200, even if the charge floating in the blast furnace 1 enters the detection device 100 through the opening 2, it will not reach the variable angle reflector 140 and the fixed angle reflector 138. In addition, the rotating shaft 110 is attached to the rotating plate 120, and the antenna 135 is housed in the rotating shaft 110, and the detection wave M is transmitted and received through the opening 121 at the center of the rotating plate 120. Therefore, without the sealing box 200, the charge floating in the blast furnace 1 will also reach the antenna 135 housed inside the rotating shaft 110. However, by using the sealing box 200, the charge will not reach the antenna 135 either. That is, the sealing box 200 can prevent the charge from entering the variable angle reflector 140, the fixed angle reflector 138, and further the antenna 135.

[0038] A purge gas ejection device 220 is installed in the space between the bottom surface 201 of the sealing box 200 and the opening 2 of the blast furnace 1. As shown in FIG. 3, the purge gas ejection device 220 is composed of a plurality of ejection nozzles, for example, three ejection nozzles 221A-221C as shown in the figure. However, the ejection nozzle may be provided in a plurality of nozzles as shown in FIG. 3, or may be a single nozzle. FIG. 3(A) is a top view, and FIG. 3(B) is a side view thereof. The three ejection nozzles 221A-221C are oriented toward the bottom surface 201 of the sealing box 200 at different inclination angles with respect to the axis O as shown in FIG. 3(B). Therefore, as shown in FIG. 3(C) which shows a typical ejection pattern of the purge gas from the ejection nozzles 221A-221C, the purge gas reaches different positions (three positions in this case) along the radial direction with respect to the bottom surface 201 of the sealing box 200 including the plate material 210.

[0039] Since the sealing box 200 rotates in the Y direction together with the rotating plate 120, as shown in FIG. 4, the purge gas from the ejection nozzles 221A-221C forms a concentric airflow centered on the center C of the bottom surface 201, and this concentric airflow spreads over the entire surface of the bottom surface 201. When the rotating plate 120 makes one revolution, the plate material 210 on the bottom surface 201 always returns to a position facing the purge gas ejection device 220, so even if the charge material enters through the opening 2 of the blast furnace 1 and adheres to the plate material 210, it is reliably removed by the purge gas. In addition, such prevention of adhesion by the purge gas is performed simultaneously with the detection of the surface profile of the charge material, so that the operation of the blast furnace 1 is not stopped and maintenance-free is realized.

[0040] As the purge gas, for example, an inert gas such as nitrogen gas (N2) can be used. Also, the purge gas ejection device 220 may be a single device or a plurality of devices may be provided, but if there are too many devices, the concentric airflow of the purge gas may be disturbed.

[0041] 1 again, one or more observation windows 230 (one in FIG. 1) for the bottom surface 201 and the plate material 210 can be installed in the space between the sealing box 200 and the opening 2 of the blast furnace 1. The bottom surface 201 and the plate material 210 of the sealing box 200 are observed through this observation window 230, and if the adhesion of the charge due to the purge gas cannot be prevented, a cleaning tool is inserted through the observation window 230 to brush off the adhering charge. During the surface profile detection operation, it is advisable to cover the observation window 230 with a removable cover 250.

[0042] Also, the opening 2 of the blast furnace 1 can be blocked with a wire mesh 240. In addition to the floating small-diameter charge materials, large-diameter charge materials may be ejected from the piled surface of the charge materials from the blast furnace 1. In order to prevent the large-diameter charge materials from colliding with the sealing box 200, the opening 2 is blocked with the wire mesh 240, and the plate material 210 on the bottom surface 201 is prevented from being broken or damaged.

[0043] Furthermore, since the detection wave M is transmitted and received using the openings in the wire mesh 240, there is substantially no effect on the detection of the surface profile of the charged material.

[0044] Furthermore, as shown in FIG. 1, the purge gas may be sprayed into the inside of the furnace by laying a breathable filter 260 made of woven heat-resistant ceramic fiber, such as "Tyranno Fiber" manufactured by Ube Industries, Ltd., on top of the wire mesh 240 covering the opening 2 of the blast furnace 1.

[0045] [Second embodiment] 5 is a cross-sectional view showing a second embodiment of the detection device of the present invention. Note that the detection device 100 shown in FIG.

[0046] As shown in Fig. 5, the detection device 100 has a transmitting / receiving means 130 for transmitting and receiving a detection wave M attached to the lower surface of a rotating plate 120 which rotates horizontally with respect to the opening 2 of the blast furnace 1 as indicated by the symbol Y about a rotating shaft 110. An antenna 135 is connected to the transmitting / receiving means 130, and a fixed angle reflector 138 having a fixed inclination angle of a reflecting surface 138a is disposed directly below the antenna 135. In addition, a dielectric lens 136 may be attached to the antenna surface of the antenna 135 in order to increase the directivity of the detection wave M.

[0047] Although not shown in the drawings, the transmitting / receiving means 130 may be placed on the inner pipe 115, and a waveguide or a coaxial cable may be installed in the inner pipe 115 and connected to the antenna 135. This makes it possible to protect the transmitting / receiving means 130 from the high temperature of the blast furnace 1.

[0048] The rotating shaft 110 has a double-tube structure, and the end of the outer tube 116 on the opening 2 side is fixed to a rotating plate 120. A gear 112 is provided on the outer circumferential surface of the outer tube 116, and a gear 155 of a motor 113 is engaged with the gear 112. Therefore, by driving the motor 113, the rotating plate 120 fixed to the outer tube 116 rotates horizontally with respect to the opening 2 of the blast furnace 1, as indicated by the symbol Y in the figure.

[0049] An angle-variable reflector 140, whose inclination angle of a reflecting surface 140a can be changed in the direction indicated by the symbol X in the figure, is attached to the end of the inner tube 115 of the rotating shaft 110 on the opening 2 side via a link mechanism 117. The angle-variable reflector 140 has a first link 117a of the link mechanism 117 fixed to the center of the surface opposite to the reflecting surface 140a, and a second link 117b is connected to the first link 117a, and the tip of the inner tube 115 is connected to the second link 117b. A rack gear 118 is formed at the other end of the inner tube 115, and a gear 119 of a motor (not shown) is engaged with the rack gear 118. When the motor is driven, the gear 119 rotates, and the rotation is converted into linear motion by the rack gear 118. Then, the inner tube 115 moves linearly toward the angle-variable reflector 140 side or the opposite side, as indicated by the symbol H in the figure.

[0050] Furthermore, support shafts 141, 141 protrude from both diametrical ends of the angle-variable reflecting plate 140, and the support shafts 141, 141 are attached to a support arm holding rod 145 so as to be freely rotatable.

[0051] When the inner pipe 115 moves toward the angle variable reflector 140 (descending in the figure), the reflecting surface 140a of the angle variable reflector 140 is inclined via the link mechanism 117 so as to face the inner wall of the blast furnace 1, and when the inner pipe 115 moves away from the angle variable reflector 140 (rising in the figure), the reflecting surface 140a of the angle variable reflector 140 is inclined via the link mechanism 117 so as to face the axis of the blast furnace 1. That is, by the descent and ascent of the inner pipe 115, the inclination of the reflecting surface 140a of the angle variable reflector 140 can be changed in the direction of the symbol X in the figure.

[0052] The fixed angle reflector 138 and the variable angle reflector 140 are disposed opposite to each other, and the detection wave M from the transmitting / receiving means 130 is reflected from the antenna 135 by the reflecting surface 138a of the fixed angle reflector 138 and sent to the reflecting surface 140a of the variable angle reflector 140, and then sent from the reflecting surface 140a of the variable angle reflector 140 into the furnace through the opening 2 of the blast furnace 1. At that time, by changing the inclination angle X of the reflecting surface 140a of the variable angle reflector 140, the transmission path of the detection wave M into the furnace is deflected in the left-right direction in the figure as shown by the symbol Z, and becomes a line along the radial direction of the rotating plate 120.

[0053] By transmitting and receiving this linear detection wave M while rotating the rotating plate 120 around the rotating axis 110, distance information in a circular scanning area covering the entire interior of the blast furnace 1, i.e., a surface profile over the entire surface of the charge, can be obtained.

[0054] Furthermore, a sealing box 200 is attached to the rotating plate 120, which extends toward the opening 2 of the blast furnace 1 and surrounds the antenna 135, the variable angle reflector 140, and the fixed angle reflector 138, and rotates in the Y direction together with the rotating plate 120. The sealing box 200 is a part of a cylinder, and a part or all of a bottom surface 201 (a part in the illustrated example; see FIG. 5) that faces the opening 2 of the blast furnace 1 is made of a plate material 210 made of a heat-resistant material that transmits the detection wave M. The plate material 210 can be a ceramic plate, a glass plate, or the like.

[0055] Also, similarly to the first embodiment, a purge gas ejection device 220, an observation window 230, and a lid 250 can be installed in the space between the bottom surface 201 of the sealing box 200 and the opening 2 of the blast furnace 1. Furthermore, the opening 2 of the blast furnace 1 can be blocked with a wire mesh 240, and a breathable filter 260 made of woven ceramic heat-resistant fibers can be laid on the wire mesh 240.

[0056] Although the present invention has been described above by exemplifying the embodiments, the present invention is not limited to these and can be modified in various ways. For example, in the blast furnace 1, the charge is also supplied into the furnace by a chute, and in order to prevent the transmission and reception of the detection wave M from being blocked by the rotation of the chute, the transmission and reception of the detection wave M is performed in accordance with the rotation of the chute in Patent Document 1. For this purpose, the rotation of the motor 113 that rotates the rotating plate 120 and the rotation of the chute are controlled, and such control can also be added to the present invention. [Explanation of symbols]

[0057] 1 blast furnace 2 Opening 100 Detection device 110 Rotational axis 113 Motor (rotating means) 114 Connecting rod 117 Link mechanism 120 Rotating Plate 130 Means of transmission and reception 135 Antenna 138 Fixed angle reflector 138A First fixed angle reflector 138B Second fixed angle reflector 138C Third fixed angle reflector 140 Variable Angle Reflector 200 sealed box 201 (bottom of sealing box) 210 Plates (made of heat-resistant materials) 220 Purge gas ejection device 221A, 221B, 221C Jet nozzle 230 Observation window 240 Wire Mesh 250 Lid 260 Filters

Claims

1. A detection device for detecting a surface profile of a blast furnace to which a charge such as iron ore, coke, or lime is supplied, the detection device transmitting a detection wave toward a surface of the charge accumulated in the furnace through an opening in the blast furnace and receiving the detection wave reflected by the surface of the charge, a rotating plate disposed above the opening and rotating about the center of the opening; A rotating means for rotating the rotating plate; a cylindrical rotating shaft that is attached concentrically to the central opening of the rotating plate and that houses an antenna therein; a transmitting / receiving means that is installed above the end of the rotating shaft opposite to the opening and is connected to the antenna, and transmits and receives the detection wave linearly along a radial direction of the rotating plate; an angle-variable reflector attached to the rotating plate and disposed in a space between the rotating plate and the opening, the angle of the reflecting surface being variable; a fixed angle reflector attached to the rotating plate and disposed in a space between the rotating plate and the opening, the fixed angle reflector having a reflecting surface and adapted to transmit the detection wave from the antenna to the reflecting surface of the variable angle reflector; a sealing box attached to the rotary plate, extending from the rotary plate toward the opening and surrounding the angle-variable reflector and the angle-fixed reflector, and having a plate member whose bottom surface facing the opening is made of a heat-resistant material that is transparent to the detection wave, or a part of the plate member; a single or a plurality of purge gas ejection devices that are installed in a space between the bottom surface of the sealing box and the opening and eject a purge gas toward the bottom surface; Equipped with A surface profile detection device for materials loaded into a blast furnace, characterized in that the purge gas is ejected from the purge gas ejection device as the rotating plate rotates, so that the purge gas flow spreads concentrically relative to the central axis of the rotating plate relative to the bottom surface.

2. A detection device for detecting a surface profile of a blast furnace to which a charge such as iron ore, coke, or lime is supplied, the detection device transmitting a detection wave toward a surface of the charge accumulated in the furnace through an opening in the blast furnace and receiving the detection wave reflected by the surface of the charge, a rotating plate disposed above the opening and rotating about the center of the opening; A rotating means for rotating the rotating plate; an antenna attached to the rotating plate and disposed in a space between the rotating plate and the opening; a transmitting / receiving means connected to the antenna for transmitting and receiving the detection wave linearly along a radial direction of the rotating plate; an angle-variable reflector attached to the rotating plate and disposed in a space between the rotating plate and the opening, the angle of the reflecting surface being variable; a fixed angle reflector attached to the rotating plate opposite the variable angle reflector, the fixed angle reflector having a fixed reflecting surface, and adapted to transmit the detection wave from the antenna to the reflecting surface of the variable angle reflector; a sealing box attached to the rotating plate, extending from the rotating plate toward the opening and surrounding the antenna, the variable angle reflector, and the fixed angle reflector, and having a plate member whose bottom surface facing the opening is made of a heat-resistant material that is transparent to the detection wave, or a part of the plate member; a single or a plurality of purge gas ejection devices that are installed in a space between the bottom surface of the sealing box and the opening and eject a purge gas toward the bottom surface; Equipped with A surface profile detection device for materials loaded into a blast furnace, characterized in that the purge gas is ejected from the purge gas ejection device as the rotating plate rotates, so that the purge gas flow spreads concentrically relative to the central axis of the rotating plate relative to the bottom surface.

3. 3. The surface profile detection device for materials loaded into a blast furnace according to claim 1 or 2, characterized in that the purge gas injection device is composed of a plurality of injection nozzles, and each of the injection nozzles has a different injection angle relative to the bottom surface.

4. The surface profile detection device for materials charged into a blast furnace according to any one of claims 1 to 3, characterized in that the opening of the blast furnace is covered with a wire mesh.

Images