Surface profile detection device for blast furnace loads

Abstract

To provide a surface profile detection device of an object charged into a blast furnace, capable of detecting the surface profile of an entire surface of a charged object, by securing a scanning region over the entire face of the charged object, irrespective of an installation state of the detection device.SOLUTION: A detection device 100 detects the surface profile of a charged object by transmitting a detection wave M toward a surface of a charged object accumulated in a furnace through an opening 2 of a blast furnace 1 provided with the charged object, and by receiving the detection wave M reflected on the surface of the charged object. The device comprises a rotary disk 120 rotating in parallel with the opening 2, an angle variable reflection plate 140 and an angle-fixed reflection plate 138 fitted to the rotation plate 120, an antenna 135 transmitting the detection wave M to the angle-fixed reflection plate 138, and a casing 170 surrounding the detection device 100. At least a part of the angle variable reflection plate 140 is installed at a position entering the opening 2 of the blast furnace 1, and a part of a bottom face side of the casing 170 is provided projecting in the blast furnace 1.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a detection device for detecting the surface profile of iron ore, coke, lime, 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. To obtain an appropriate deposition state, it is necessary to accurately measure and detect the surface profile of these burden materials in a short time and replenish the burden so that it becomes a theoretical deposition state, i.e., a "theoretical deposition profile," which has been determined in advance.

[0003] In order to detect such a surface profile of the burden material 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, the inclination angle of the reflecting surface of the detection wave toward the blast furnace being 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 by rotating the rotating plate, the surface profile of the burden material accumulated in the blast furnace can be quickly detected in a linear or planar manner. [Prior art documents] [Patent documents]

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

[0005] Because the above-mentioned detection device is installed outside the blast furnace through the opening of the blast furnace, there is a difference in elevation between the variable-angle reflector and the opening of the blast furnace. Figure 7 is a schematic diagram showing the variable-angle reflector 140 of the above-mentioned detection device and the opening 2 of the blast furnace 1. The variable-angle reflector 140 rotates in the direction of arrow X, and the detection wave M is swung left and right in the figure. It propagates into the furnace through the opening 2 and scans the surface of the charge (not shown) accumulated in the furnace. Figure 7 (A) shows the propagation pattern of the detection wave M when the center point P (hereinafter also referred to as the "measurement reference point") of the reflecting surface 140a of the variable-angle reflector 140 is located farther from the opening 2, and Figure 7 (B) shows the propagation pattern of the detection wave M when the center point P is located closer to the opening 2. For openings 2 with the same opening area, if the measurement reference point P is farther from the opening 2, the detection wave M is blocked by the opening 2, as indicated by the diagonal lines in Figure 7 (A).

[0006] 8(A) and (B) are schematic diagrams of the inside of the furnace viewed from the opening 2, where FIG. 8(A) corresponds to FIG. 7(A) and shows the case where the measurement reference point P is far from the opening 2, and FIG. 8(B) corresponds to FIG. 7(B) and shows the case where the measurement reference point P is close to the opening 2. The charge material 300 is piled up to the inner wall 1a of the blast furnace 1, but when the measurement reference point P is far from the opening 2 (corresponding to FIG. 7(A)), the opening 2 appears small, and the entire surface of the charge material 300 cannot be seen, as shown by the diagonal lines in FIG. 8(A). In contrast, when the measurement reference point P is close to the opening 2 (corresponding to FIG. 7(B)), the entire surface of the charge material 300 can be seen from the opening 2, and the scanning area also covers the entire surface of the charge material 300.

[0007] Even if the measurement reference point P is far from the opening 2, the scanning area can be expanded by increasing the opening area of ​​the opening 2, but this requires work to enlarge the opening 2. In addition, the high pressure inside the blast furnace requires large-scale modifications to the blast furnace, which is neither space-consuming nor economical.

[0008] Alternatively, it is possible to use a lifting device to bring the entire detection device closer to the opening 2 when measuring the surface profile of the charge material, but this requires a separate lifting device, which increases equipment costs.The inside of a blast furnace is under high pressure, and moving the detection device up and down requires a sealant with a size equivalent to the outer shape of the detection device, which increases the risk of gas leakage.

[0009] As such, it is expected that the scanning area may become narrower depending on the installation conditions of the detection device. Therefore, the present invention aims to provide a surface profile detection device for materials charged into a blast furnace that can ensure a scanning area covering the entire surface of the charge material and detect the surface profile of the entire surface of the charge material, regardless of the installation conditions of the detection device. [Means for solving the problem]

[0010] As a result of careful consideration to solve the above problems, the inventors discovered that it is effective to secure a scanning area by restricting the position of the angle-variable reflector so that the measurement reference point P is closer to the opening 2, as shown in Figure 7(B), and that it is preferable to use a swing-type gate valve to isolate the detection device from the inside of the blast furnace from below, thereby arriving at the present invention. That is, the present invention provides the following surface profile detection device for objects loaded into a blast furnace.

[0011] (1) A detection device for detecting a surface profile of a burden material such as iron ore, coke, or lime in a blast furnace, by transmitting a detection wave toward a surface of the burden material deposited 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 that is installed above the opening and rotates around the center of the opening as a central axis; a rotating means for rotating the rotating plate; a cylindrical rotating shaft having an opening at the center of the rotating plate, the rotating shaft being attached concentrically with the opening and accommodating an antenna therein; a transmitting / receiving means that is installed above the end of the rotary shaft opposite to the opening, is connected to the antenna, and transmits and receives the detection wave linearly along the radial direction of the rotary plate; Attached to the rotating plate , below the rotating plate an angle-variable reflector disposed in the space and having a variable angle of the reflecting surface; Attached to the rotating plate , below the rotating plate a fixed-angle reflector arranged in the space and having a fixed angle of a reflecting surface for transmitting the detection wave from the antenna to the reflecting surface of the angle-variable reflector; A casing that surrounds the entire detection device and has an open bottom surface facing the opening of the blast furnace, A surface profile detection device for materials loaded into a blast furnace, characterized in that at least a portion of the angle-variable reflector is installed at a position where it enters the opening of the blast furnace, and a portion of the bottom side of the casing is installed so as to protrude into the furnace from the opening of the blast furnace. (2) A detection device for detecting a surface profile of a burden material such as iron ore, coke, or lime in a blast furnace, by transmitting a detection wave toward a surface of the burden material deposited 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 that is installed above the opening and rotates around the center of the opening as a central axis; a rotating means for rotating the rotating plate; an antenna attached to the rotary plate and disposed in a space between the rotary plate and the opening; a transmitting / receiving means connected to the antenna for transmitting and receiving the detection wave linearly along the radial direction of the rotating plate; Attached to the rotating plate , below the rotating plate an angle-variable reflector disposed in the space and having a variable angle of the reflecting surface; a fixed-angle reflector attached to the rotary plate opposite the variable-angle reflector, the fixed-angle reflector having a fixed reflecting surface, for transmitting the detection wave from the antenna to the reflecting surface of the variable-angle reflector; A casing that surrounds the entire detection device and has an open bottom surface facing the opening of the blast furnace, At least a part of the angle-variable reflector is installed at a position where it enters the opening of the blast furnace, and a part of the bottom side of the casing is in contact with the furnace from the opening of the blast furnace. Hit 1. A surface profile detection device for detecting a surface profile of a charge in a blast furnace, the device being installed outside the furnace. (3) A surface profile detection device for materials charged into a blast furnace according to (1) or (2) above, characterized in that it is provided with a swing-type gate valve that rotates in the axial direction of the casing, covers the bottom surface when the surface profile of the material is not being measured, and hangs down toward the material when the surface profile of the material is being measured. (4) The surface profile detection device for materials charged into a blast furnace according to (3) above, characterized in that the gate valve is a split type that splits and covers the bottom surface. (5) A surface profile detection device for materials loaded into a blast furnace as described in (3) or (4) above, characterized in that a gasket is attached to the surface of the gate valve facing the bottom surface of the casing to close the gap between the gate valve and the casing. (6) The surface profile detection device for materials charged into a blast furnace according to any one of (3) to (5) above, characterized in that the surface of the gate valve on the charge side is covered with a refractory material. (7) A surface profile detection device for materials loaded into a blast furnace as described in (5) or (6) above, characterized in that it is provided with a box body that surrounds the portion of the casing that protrudes into the furnace from the opening of the blast furnace and the check valve, and an inspection hatch provided in the box body for performing maintenance on at least one of the gasket and the refractory material. [Effects of the Invention]

[0012] According to the surface profile detection device for materials charged into a blast furnace of the present invention, the scanning area can be widened, and additional work or equipment such as enlarging the opening of the blast furnace or using an elevator is not required. Therefore, the device can be applied to various existing blast furnaces, and the surface profile of the entire surface of the charged material can be detected. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a cross-sectional view showing a first embodiment of the surface profile detection device for a blast furnace load according to the present invention. [Figure 2] FIG. 2 is a cross-sectional view showing a state in which the detection device of the first embodiment is installed at the opening of a blast furnace. [Figure 3] Figure 3 is a cross-sectional view showing an example of a gate valve, where (A) shows the gate valve in a closed state, (B) shows the gate valve in an open state, and (C) is a schematic view of (B) from inside the furnace. [Figure 4] FIG. 4 is a schematic diagram showing a state in which a refractory material and a packing are attached to a gate valve. [Figure 5] FIG. 5 is a schematic diagram showing a split gate valve. [Figure 6] FIG. 6 is a cross-sectional view showing a second embodiment of the surface profile detection device for a blast furnace charge according to the present invention. [Figure 7] 7(A) and 7(B) are diagrams for explaining the propagation mode of the detection wave depending on the difference in elevation between the measurement reference point and the opening. [Figure 8] FIG. 8 is a schematic diagram of the inside of a blast furnace as seen from the opening of the furnace, where FIG. 8(A) corresponds to FIG. 7(A) and FIG. 8(B) corresponds to FIG. 7(B). DETAILED DESCRIPTION OF THE INVENTION

[0014] The present invention will now be described in detail with reference to the drawings.

[0015] [First embodiment] Fig. 1 is a cross-sectional view showing a first embodiment of a surface profile detection device for materials charged into a blast furnace (hereinafter also referred to as a "detection device") according to the present invention. Note that for detailed structure and function of the detection device 100 shown in Fig. 1, the first embodiment of Patent Document 1 can be referred to.

[0016] As shown in FIG. 1, the detection device 100 includes a rotating plate 120 that rotates around a rotation axis 110 .

[0017] The rotary plate 120 is an annular disk with an opening in the center. The opening in the center of the rotary plate 120 is indicated by reference numeral 121.

[0018] The rotating shaft 110 is cylindrical and houses an antenna 135 therein. The antenna 135 is attached concentrically with the opening 121 of the rotating plate 120. The antenna 135 is connected to a transmitting / receiving means 130 for transmitting the detection wave M via a waveguide 133. The upper end of the waveguide 133, which is located on the transmitting / receiving means 130 side of the connecting rod 114, is separated from the connecting rod 114, preventing the transmitting / receiving means 130 from rotating. 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 to prevent leakage of the detection wave M. The waveguide 133 is aligned with the axis of the rotating shaft 110. A dielectric lens 136 made of fluororesin or the like may be attached to the antenna surface of the antenna 135 to increase the directivity of the detection wave M. The dielectric lens 136 also allows millimeter waves to be used 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 drawing can be reduced, and the dielectric lens 136 can be omitted.

[0019] A gear 112 is provided on the outer peripheral 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 accordingly 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.

[0020] Below the rotating plate 120 Sky Between them, a fixed angle reflector 138 and a variable angle reflector 140 are arranged for transmitting and receiving the detection wave M into the furnace.

[0021] Fixed-angle reflector 138 is a reflector whose reflecting surface has a fixed inclination angle of 45° and is composed of first fixed-angle reflector 138A, second fixed-angle reflector 138B, and third fixed-angle reflector 138C. First fixed-angle reflector 138A faces the antenna surface of antenna 135 (dielectric lens 136 in the illustrated example) through opening 121 in rotating plate 120. Second fixed-angle reflector 138B faces first fixed-angle reflector 138A, and third fixed-angle reflector 138C faces second fixed-angle reflector 138B. Therefore, as shown by the dashed-dotted line in the figure, detection wave M transmitted from antenna 135 is reflected by first fixed-angle reflector 138A and sent to second fixed-angle reflector 138B, and then reflected by second fixed-angle reflector 138B and sent to 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.

[0022] The first fixed angle reflector 138A, the second fixed angle reflector 138B, and the third fixed angle reflector 138C are fixed members that hang down from the rotating plate 120 toward the opening 2 of the blast furnace 1. (not shown). Alternatively, the first fixed angle reflector 138A, the second fixed angle reflector 138B, and the third fixed angle reflector 138C can be attached to a side wall 170 that extends from the rotary plate 120 toward the opening 2 of the blast furnace 1 and is attached to the periphery of the rotary plate 120. The side wall 170 is a cylindrical body with an open bottom that faces the opening 2 of the blast furnace 1, and constitutes part of the casing.

[0023] Since the furnace interior is hot and contains dust and water vapor, it is preferable to use microwaves or millimeter waves as the detection wave M. Millimeter waves are particularly preferable because they have shorter wavelengths and higher directionality than microwaves.

[0024] The angle-variable reflector 140 is a reflector in which the tilt angle of the reflecting surface 140a can be varied 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 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 interior of the rotating shaft 110 through an opening 121 in 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.

[0025] The connecting rod 114 has an outer tube portion 114a having an inner tube, which is a waveguide 133 that connects the antenna 135 and the transmitting / receiving means 130, and a rack gear 118 is formed on the outer peripheral surface of the outer tube portion 114a. A gear 119 of a motor 125 meshes with this rack gear 118, and when the motor 125 is driven, 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.

[0026] 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.

[0027] Furthermore, the intermediate portion 114b has a lower end portion 114c that extends to the opening 2 of the blast furnace 1 through the opening 121 of the rotary plate 120. The lower end portion 114c is connected to a second link 117b of the link mechanism 117.

[0028] The connecting rod 114 is configured in this way, and rotation is converted into linear motion by the rack gear 118 via the gear 119, and the connecting rod 114 moves linearly to the side of the angle-variable reflector 140 or the opposite side, as shown by the symbol H in the figure.

[0029] Furthermore, although not shown, the portion of waveguide 133 on the antenna 135 side may be made free from rotation shaft 110 so that waveguide 133 does not rotate even when rotation shaft 110 rotates. In this way, there is also a method in which waveguide 133 is not divided by separation portion 180.

[0030] Alternatively, an insertion hole having a diameter slightly larger than that of waveguide 133 can be provided in the top plate of rotating shaft 110, so that antenna 135 does not rotate even when rotating shaft 110 rotates.

[0031] Support shafts 141, 141 are provided protruding 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 rotatable.

[0032] When the connecting rod 114 moves toward the angle-variable reflector 140 (downward in the figure), the reflecting surface 140a of the angle-variable reflector 140 is tilted 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 (upward in the figure), the reflecting surface 140a of the angle-variable reflector 140 is tilted via the link mechanism 117 so as to face the axis of the blast furnace 1. In other words, the tilt of the reflecting surface 140a of the angle-variable reflector 140 can be changed in the direction of the symbol X in the figure by the downward and upward movement of the connecting rod 114. The center of the reflecting surface 140a of this angle-variable reflector 140 is the "measurement reference point P" shown in Figures 7(A) and 7(B).

[0033] 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 left and right 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.

[0034] The detection wave M is reflected by the surface of the charge (not shown) accumulated in the furnace, travels 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.

[0035] By transmitting and receiving this linear detection wave M while rotating the rotating plate 120 around the rotation axis 110, distance information in a circular scanning area relative to the surface of the charge material deposited in the furnace, i.e., the surface profile of the charge material, can be obtained.

[0036] The detection device 100 is installed at the opening 2 of the blast furnace 1 as shown by arrow A in Fig. 1. In this case, in the present invention, the detection device 100 is installed at a position where a part or all of the variable-angle reflector 140 enters the opening 2, as shown in Fig. 2. When installing the detection device 100, for example, a flange 171 protruding from the outer peripheral surface of the side wall (casing) 170 is fixed along the periphery of the opening 2 of the blast furnace 1. By installing the detection device 100 in this manner, the center of the reflecting surface 140a of the variable-angle reflector 140, i.e., the measurement reference point P, is located inside or very close to the opening 2, and the scanning area is widened as described with reference to Figs. 7(A) and 7(B).

[0037] Furthermore, since the side wall 170 remains as it is, by installing the angle-variable reflecting plate 140 so that part or all of it enters the opening 2, part of the bottom side of the side wall 170 protrudes into the furnace from the opening 2. In order to prevent high temperatures and dust from entering from inside the furnace, the bottom surface of the side wall 170 may be closed with a heat-resistant plate material (e.g., a glass plate) that transmits the detection wave M, but when the surface profile of the charge material is not being measured, i.e., when not being detected, such as during maintenance work, it may also be covered with a gate valve 200 as shown in FIG.

[0038] For simplicity, FIG. 3 only shows the opening 2 of the blast furnace 1, the bottom surface 170a of the side wall 170, and the gate valve 200. A swing valve can be used as the gate valve 200. The gate valve 200 has a cover member 210 that covers the entire bottom surface 170a of the side wall 170, and a support member 211 that is formed continuously with one end of the cover member 210, and has an L-shaped cross section as a whole. The support member 211 is connected to a rotating shaft 220, and the gate valve 200 rotates around the rotating shaft 220 in the direction of the axis C of the side wall 170 as indicated by arrow R. Then, by operating the rotating shaft 220, as shown in the same figure (A), when the surface profile of the load material is not being measured, the cover member 210 of the check valve 200 faces and covers the bottom surface 170a of the side wall 170, and as shown in the same figure (B), when the surface profile of the load material is being measured, i.e., when it is being detected, the cover member 210 of the check valve 200 is rotated in a direction away from the axis C to expose the bottom surface 170a of the side wall 170.

[0039] The flange 171a of the side wall 170 on the gate valve 200 side has an opening to ensure a gap 172 for connecting the rotating shaft 220 to an external drive source. The entire structure is surrounded by a cover body 173, including the rotating shaft 220. The opening 2 of the blast furnace 1 is also extended, as indicated by the symbol 2a, so that the support member 211 of the gate valve 200 can rotate.

[0040] Also, as shown in the same figure (C), a box body 175 may be attached which surrounds the part of the side wall 170 that protrudes into the furnace from the opening 2 of the blast furnace 1 and the gate valve 200 and is open to the inside of the furnace.

[0041] Furthermore, a gasket 240 may be attached to the surface 210b of the cover member 210 of the gate valve 200 that faces the bottom surface 170a of the side wall 170, thereby improving the sealing performance between the cover member 210 of the gate valve 200 and the bottom surface 170a of the side wall 170.

[0042] As shown in Fig. 1C, inspection hatches 176 are provided on both side walls 175a supporting both ends of the rotary shaft 220 of the box body 175, allowing for observation and replacement of the packing 240 and the refractory material 230. Furthermore, the inspection hatch 176 is openable and closable with a cover 177, and is closed when the surface profile of the charge is measured, and is opened when the charge is replaced.

[0043] As shown in FIG. 4, a refractory material 230 may be attached to a surface 210a of the cover member 210 facing the charge, thereby further increasing the heat resistance of the gate valve 200.

[0044] Furthermore, the gate valve 200 can also be made into a split type. As one example, a two-split type gate valve 200A is shown in Figure 5. This split type gate valve 200A is provided as a pair on both sides of the side wall 170, and the respective cover members 210a, 210a meet to cover the entire bottom surface 170a of the side wall 170. The split type gate valve 200A may also be split into three or four parts.

[0045] Furthermore, the split gate valve 200A may also be similarly provided with a refractory material 230 and a packing 240 as shown in FIG.

[0046] [Second embodiment] Fig. 6 is a cross-sectional view showing a second embodiment of the detection device of the present invention. Note that the third embodiment of Patent Document 1 can be referred to for detailed structure and function of the detection device 100 shown in Fig. 6.

[0047] As shown in Fig. 6, the detection device 100 has a transmitting / receiving means 130 for transmitting and receiving a detection wave M attached to the underside of a rotating plate 120 that rotates horizontally relative to the opening 2 of the blast furnace 1 as indicated by the symbol Y around a rotating shaft 110. An antenna 135 is connected to the transmitting / receiving means 130, and a fixed-angle reflector 138, whose reflecting surface 138a has a fixed inclination angle, 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.

[0048] Although not shown, the transmitting and 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 and receiving means 130 from the high temperature of the blast furnace 1.

[0049] The rotating shaft 110 has a double-tube structure, and the end of the outer tube 111 on the opening 2 side is fixed to a rotating plate 120. A gear 112 is provided on the outer peripheral surface of the outer tube 111, 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 111 rotates horizontally relative to the opening 2 of the blast furnace 1, as indicated by the symbol Y in the figure.

[0050] An angle-variable reflector 140, whose angle of inclination of a reflecting surface 140a can be varied in the direction indicated by symbol X in the figure, is attached to the end of the inner tube 115 of the rotating shaft 110 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 the reflecting surface 140a. 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 is engaged with a gear 119 of a motor (not shown). When the motor is driven, the gear 119 rotates, and the rotation is converted into linear motion by the rack gear 118. The inner tube 115 then moves linearly toward or away from the angle-variable reflector 140, as indicated by symbol H in the figure.

[0051] Furthermore, support shafts 141, 141 are provided protruding 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.

[0052] When the inner pipe 115 moves toward the angle-variable reflector 140 (downward in the figure), the reflecting surface 140a of the angle-variable reflector 140 is tilted 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 (upward in the figure), the reflecting surface 140a of the angle-variable reflector 140 is tilted via the link mechanism 117 so as to face the axis of the blast furnace 1. In other words, by the downward and upward movement of the inner pipe 115, the tilt of the reflecting surface 140a of the angle-variable reflector 140 can be changed in the direction of symbol X in the figure.

[0053] The fixed angle reflector 138 and the variable angle reflector 140 are disposed opposite 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 this 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 left and right in the figure as shown by the symbol Z, becoming a line along the radial direction of the rotating plate 120.

[0054] By transmitting and receiving this linear detection wave M while rotating the rotating plate 120 around the rotation axis 110, distance information in a circular scanning area relative to the surface of the charge material deposited in the furnace, i.e., the surface profile of the charge material, can be obtained.

[0055] 2 of the first embodiment, the angle-variable reflecting plate 140 is installed via a flange 171 so that part or all of it enters the opening 2. This widens the scanning area.

[0056] Furthermore, since a portion of the bottom side of the side wall 170 protrudes into the furnace from the opening 2, the gate valve 200 and split gate valve 200A shown in Figures 3 to 5 of the first embodiment can be attached, although not shown. [Explanation of symbols]

[0057] 1 blast furnace 2 Opening 100 Detection device 110 Rotation 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 170 Sidewall (Casing) 171, 171a flange 175 Box body 176 Inspection hatch 177 Cover 200 Gate valve 200A Split Gate Valve 210 Lid member 211 Support member 220 Rotational Axis 230 Refractories 240 Gasket 300 Charge M detection wave

Claims

1. A detection device for detecting a surface profile of a burden material, such as iron ore, coke, or lime, in a blast furnace, the detection device transmitting a detection wave toward a surface of the burden material deposited 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 that is installed above the opening and rotates around the center of the opening as a central axis; a rotating means for rotating the rotating plate; a cylindrical rotating shaft having an opening at the center of the rotating plate, the rotating shaft being attached concentrically with the opening and accommodating an antenna therein; a transmitting / receiving means that is installed above the end of the rotary shaft opposite to the opening, is connected to the antenna, and transmits and receives the detection wave linearly along the radial direction of the rotary plate; an angle-variable reflector attached to the rotary plate and disposed in a space below the rotary plate, the angle of the reflecting surface of which is variable; a fixed-angle reflector attached to the rotary plate and disposed in a space below the rotary plate, the fixed-angle reflector having a fixed reflecting surface angle, for transmitting the detection wave from the antenna to the reflecting surface of the variable-angle reflector; A casing that surrounds the entire detection device and has an open bottom surface facing the opening of the blast furnace, A surface profile detection device for materials loaded into a blast furnace, characterized in that at least a portion of the angle-variable reflector is installed at a position where it enters the opening of the blast furnace, and a portion of the bottom side of the casing is installed so as to protrude into the furnace from the opening of the blast furnace.

2. A detection device for detecting a surface profile of a burden material, such as iron ore, coke, or lime, in a blast furnace, the detection device transmitting a detection wave toward a surface of the burden material deposited 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 that is installed above the opening and rotates around the center of the opening as a central axis; a rotating means for rotating the rotating plate; an antenna attached to the rotary plate and disposed in a space between the rotary plate and the opening; a transmitting / receiving means connected to the antenna for transmitting and receiving the detection wave linearly along the radial direction of the rotating plate; an angle-variable reflector attached to the rotary plate and disposed in a space below the rotary plate, the angle of the reflecting surface of which is variable; a fixed-angle reflector attached to the rotary plate opposite the variable-angle reflector, the fixed-angle reflector having a fixed reflecting surface, for transmitting the detection wave from the antenna to the reflecting surface of the variable-angle reflector; A casing that surrounds the entire detection device and has an open bottom surface facing the opening of the blast furnace, A surface profile detection device for materials loaded into a blast furnace, characterized in that at least a portion of the angle-variable reflector is installed at a position where it enters the opening of the blast furnace, and a portion of the bottom side of the casing is installed so as to protrude into the furnace from the opening of the blast furnace.

3. 3. The surface profile detection device for materials charged into a blast furnace according to claim 1 or 2, characterized in that it is provided with a swing-type gate valve that rotates in the axial direction of the casing, covers the bottom surface when the surface profile of the material is not being measured, and hangs down toward the material when the surface profile of the material is being measured.

4. 4. The surface profile detection device for materials charged into a blast furnace according to claim 3, wherein the gate valve is a split type that splits and covers the bottom surface.

5. A surface profile detection device for materials loaded into a blast furnace as described in claim 3 or 4, characterized in that a gasket is attached to the surface of the gate valve facing the bottom surface of the casing to block the gap between the gate valve and the casing.

6. The surface profile detection device for materials charged into a blast furnace according to any one of claims 3 to 5, characterized in that the surface of the gate valve on the charge side is covered with a refractory material.

7. A surface profile detection device for materials loaded into a blast furnace as described in claim 5 or 6, characterized in that it comprises a box body surrounding the portion of the casing that protrudes into the furnace from the opening of the blast furnace and the check valve, and an inspection hatch provided in the box body for performing maintenance on at least one of the gasket and the refractory material.

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