Inspection device and method for hot blast furnace heat storage bricks

Abstract

To provide an apparatus and a method for investigating a brick for heat storage in a hot blast furnace capable of clearly determining a repair boundary of a deteriorated brick.SOLUTION: A device and a method for investigating a brick B for heat storage of a hot blast furnace 11 include: a detection part 2 which can be inserted into a canal hole C of the brick B and has a substantially circular cross-sectional shape orthogonal to the elongation direction of the canal hole C; and a support part 3 which has a maximum dimension in the same direction smaller than the maximum outer diameter of the detection part 2 in the direction orthogonal to the elongation direction of the canal hole C and is a strip extending in the elongation direction of the canal hole C and deformable in the direction intersecting the elongation direction.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an apparatus and method for inspecting bricks for use in a regenerator of a hot stove, and more particularly to an apparatus and method for inspecting the condition of bricks stacked in the regenerator of a hot stove. [Background technology]

[0002] Facilities requiring high-temperature gas (combustion air), such as blast furnaces, typically use hot stoves that generate high-temperature gas using a regenerator. Hot stoves are commonly constructed with gitter bricks (hereafter referred to as bricks) that have canal holes through which gas flows, stacked and packed into the regenerator. The heat stored in the bricks through heat exchange with high-temperature gases, such as combustion gases, is then used to heat another gas. Because the bricks in this type of equipment deteriorate over many years of use, periodic renovation work, including brick replacement, is required. While renovation of hot stove regenerators traditionally involved dismantling and reassembling the entire brick stack, partial renovation work, in which only the middle or upper brick layers are renovated, has become common in recent years.

[0003] In brick repair, deterioration of the bricks, particularly partial collapse of the bricks, causes the canal holes to become clogged, increasing pressure loss, and reducing the flow rate of combustion gas and combustion air, making it impossible to maintain the ventilation capacity required for blast furnace operation. Repairs are often required because of this. One method for determining the clogged brick state is described in, for example, Patent Document 1 below. This brick clog detection method periodically measures pressure loss, calculates airflow resistance from this pressure loss, calculates changes in airflow resistance over time from this airflow resistance, excluding changes in resistance due to differences in operating conditions, and estimates the clogged brick state based on these changes in airflow resistance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 63-7310 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the brick clogging detection method described in Patent Document 1 can determine the clogging state of all stacked bricks, but cannot determine which canal holes are clogged or where in the vertical direction the clog is. In other words, it is not possible to determine the degree of deterioration of bricks at which positions among the many bricks stacked vertically, making it difficult to determine a clear boundary for repair when determining the repair area. Therefore, repairing an excessive range of bricks will increase repair costs, while repairing an insufficient range will result in the plant being restarted with the clogs remaining, resulting in high pressure loss even after the repair.

[0006] The present invention has been made in consideration of the above-mentioned problems, and its object is to provide an inspection device and method for hot stove thermal storage bricks that can clearly determine the repair boundary of deteriorated bricks. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, one embodiment of the present invention provides an inspection device for hot stove heat storage bricks, which is a device for inspecting heat storage bricks in a hot stove, and is characterized by comprising: a detection unit that can be inserted into a canal hole of the brick and has a substantially circular cross-sectional shape perpendicular to the extension direction of the canal hole; and a support unit that is a strip that extends in the extension direction of the canal hole and has a maximum dimension in the direction perpendicular to the extension direction of the canal hole that is smaller than the maximum outer diameter of the detection unit in the same direction, and is deformable in a direction intersecting the extension direction.

[0008] Furthermore, a further aspect of the present invention is characterized in that the support portion is inserted into an inner hole of a tubular member, and the tubular member is insertable into the canal hole, has a ring-shaped cross-sectional shape in a direction perpendicular to the extension direction, has a maximum outer diameter smaller than the maximum outer diameter of the detection portion, and is movable in the extension direction of the support portion. In a further aspect of the present invention, the cylindrical member has an outer diameter at one or both ends in the extension direction that is smaller than the maximum outer diameter.

[0009] In a further aspect of the present invention, the cylindrical members are arranged side by side in the extension direction of the support portion, and adjacent cylindrical members engage with each other at predetermined radial positions. A further aspect of the present invention is characterized in that it comprises a feeding device that feeds the detection unit together with the support unit into the canal hole and removes it from the canal hole, a measuring device that measures the insertion length of the detection unit and the support unit until the detection unit can no longer be fed into the canal hole, a moving device that moves the bottom of the hot stove, and a remote control device that enables the feeding device, measuring device, and moving device to be remotely controlled.

[0010] Furthermore, a method for inspecting hot stove heat storage bricks according to one aspect of the present invention is characterized in that the above-mentioned hot stove heat storage brick inspection device is used to insert the detection unit into the canal hole from below, and detect whether the canal hole is clogged and the location of the clog based on the length that can be inserted. [Effects of the Invention]

[0011] According to the hot stove regenerator brick inspection device and method of the present invention, the detection unit, together with the support unit, is inserted into the canal hole of the stacked bricks, and the presence or absence of blockage in the canal hole and the vertical position of the blockage can be detected based on the insertion length. Therefore, it is possible to clearly grasp which bricks are deteriorated and at what position among the many bricks stacked vertically, and as a result, it is possible to clearly determine the repair boundary of the deteriorated bricks. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a schematic diagram showing an embodiment of a hot stove to which the hot stove thermal storage brick inspection device and method of the present invention are applied. [Figure 2] FIG. 2 is a plan view of bricks packed in the hot stove of FIG. 1. [Figure 3] FIG. 2 is a schematic diagram of an inspection device for hot stove heat storage bricks used in the hot stove of FIG. 1. [Figure 4] 1 is a partial cross-sectional front view showing an example of a detection unit, a support unit, and a cylindrical member that can be applied to the investigation device of the present invention. FIG. [Figure 5] FIG. 10 is a partial cross-sectional front view showing another example of a detection unit, a support unit, and a cylindrical member that can be applied to the investigation device of the present invention. [Figure 6] FIG. 10 is a partial cross-sectional front view showing still another example of a detection unit, a support unit, and a cylindrical member that can be applied to the investigation device of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] An embodiment of an apparatus and method for inspecting hot stove regenerative bricks according to the present invention will be described in detail below with reference to the drawings. The embodiment shown below exemplifies an apparatus and method for embodying the technical concept of the present invention, and the technical concept of the present invention does not limit the materials, shapes, structures, arrangements, etc. of the components to the embodiment described below. Furthermore, the drawings are schematic. Therefore, it should be noted that the relationships and ratios between thicknesses and planar dimensions differ from those in reality, and the drawings also contain portions where the relationships and ratios of dimensions differ from one another.

[0014] FIG. 1 is a schematic diagram of a hot stove 11 to which the heat storage brick inspection device and method of this embodiment are applied, and is an overall view of a typical hot stove used in a blast furnace. The hot stove 11 is configured with a combustion chamber 12 and a heat regenerator 13, both of which are connected at the top. A burner 14 is provided at the bottom of the combustion chamber 12, and this burner 14 burns combustible gas and air to generate high-temperature combustion gas. Meanwhile, bricks (gitter bricks) B are stacked at the bottom of the heat regenerator 13. In this example, multiple support columns 15 are erected at the hearth of the heat regenerator 13, plate-shaped support metal fittings 16 are mounted and fixed above the support columns 15, and a large number of bricks B are stacked on top of the support metal fittings 16. FIG. 2 shows a plan view of the bricks B. The bricks B have multiple canal holes C that penetrate vertically when stacked, and the canal holes C are vertically connected to each other when stacked. That is, the canal hole C extends in the vertical direction.

[0015] Bricks B are tightly packed, with approximately 1 to 1,000 bricks per layer, and are stacked vertically in approximately 100 to 300 layers. Therefore, the regenerator chamber 13 can be as tall as 40 meters. The canal holes C, which penetrate the stacked bricks B from top to bottom, are designed to allow gas to pass through without resistance. When combustion gas passes through these canal holes C, heat is stored in the brick sections Bb of the bricks B. When blowing air into the blast furnace, a large amount of air is passed through the canal holes C to absorb heat and raise the temperature to approximately 1,200°C. However, in hot stoves 11 that have been used for many years, the dome bricks and gitter bricks B that cover the top of the regenerator chamber deteriorate and collapse, causing brick debris to fall into the canal holes C and clog them. When the canal holes C become clogged, pressure loss increases, as mentioned above, so a means of detecting clogged canal holes C is required.

[0016] A space that serves as a flow path for combustion gas and air is formed between the hearth bottom and the support bracket 16 supported by the support columns 15. The hot-blast furnace thermal storage brick inspection device 1 of this embodiment is configured to move within this space along the hearth bottom. FIG. 3 is a schematic diagram of the inspection device 1. To provide an overview of this inspection device 1, it inserts a probe from below into the canal hole C of the stacked bricks B while moving along the hearth bottom. The presence or absence of a clog in the canal hole C is detected based on whether the probe penetrates. If the probe does not penetrate, the height of the clog in the canal hole C is detected based on the insertion length. This inspection device 1 is configured with a detection unit 2 that can be inserted into the canal hole C as a probe for detecting a clog in the canal hole C, and a support unit 3 that supports the detection unit 2 and inserts it into the canal hole C. The detection unit 2 of this embodiment is a sphere of a size that can be inserted into the canal hole C. This detecting unit 2 does not have to be spherical as long as it has a shape that can be inserted into the canal hole C, but as will be described later, the cross-sectional shape in the direction of insertion into the canal hole C, i.e., the direction perpendicular to the extension direction of the canal hole C, is made approximately circular in order to determine the degree of clogging of the canal hole C. In other words, the larger the outer diameter of this circular cross section, the more strict the degree of narrowing of the canal hole C, i.e., the degree of clogging, can be evaluated.

[0017] The support part 3 is composed of a strip (rib-shaped body) that supports the detection part 2 and has the rigidity required to insert the detection part 2 into the canal hole C. Therefore, the support part 3 is a long strip that extends in the extension direction of the canal hole C and corresponds to the height of the stacked bricks B. Furthermore, since the support part 3 must not abut against the clogged portion of the canal hole C before the detection part 2 when it is inserted into the canal hole C while supporting the detection part 2, the maximum dimension in the direction perpendicular to the extension direction of the canal hole C is set smaller than the maximum outer diameter of the detection part 2 in the direction perpendicular to the extension direction of the canal hole C. At the same time, since the heightwise position of the clog in the canal hole C is detected by the insertion length of the support part 3 (which essentially includes the heightwise dimension of the detection part 2), it is required that the support part 3 does not expand or contract in the extension direction. On the other hand, since it is difficult for the long support part 3 to move within the space below the bricks B while maintaining its straightness, the support part 3 must be deformable in a direction perpendicular to the extension direction. That is, on the investigation device 1, the support part 3 is stored in a wound or folded state, and when the detection part 2 is inserted into the canal hole C, the support part 3 is stretched and fed into the canal hole C. As an example of a support part 3 having such characteristics, a wire rope that has excellent ability to restore to a straight state can be used.

[0018] In this embodiment, the long support part 3 is wound around a winding drum 4 and stored in the investigation device 1. This winding drum 4 can wind and unwind the support part 3 by being rotated by a drive mechanism (not shown), thereby forming a feeding device that feeds and removes the detection part 2 into and from the canal hole C. A guide 5 made of a cylindrical member is erected above the winding drum 4. The upper end of the support part 3 protrudes upward through the inside of this guide 5, and the detection part 2 made of a sphere is attached to its upper end. Further above the upper end of this guide 5, a pair of opposing rollers 6 are arranged to sandwich the support part 3. The outer circumferential surface of each roller 6 abuts against the outer circumferential surface of the support part 3 made of a strip. Therefore, the rollers 6 rotate as the support part 3 is unwound (as well as when being wound), and the amount of unwound support part 3 can be detected by detecting the amount of rotation using a rotation amount detection device (not shown). By detecting the unwinding amount of the support part 3 in this way, a measuring device is configured that detects the insertion length of the support part 3 (including the detection part 2) into the canal hole C. Note that the unwinding amount of the support part 3 can also be detected by the amount of rotation of the winding drum 4 in the unwinding direction.

[0019] Wheels 7 are provided at the bottom of the inspection device 1 for moving along the furnace bottom. These wheels are driven by a drive mechanism (not shown) to rotate and form a moving device that moves the inspection device 1 along the furnace bottom. Crawlers may be attached to the wheels 7. A video camera 17 is provided at the top of the inspection device 1, capturing an image of the area above along with the detection unit 2. The video camera 17 captures an image of the canal hole C (effectively the canal hole C provided in the receiving metal fitting 16) along with the detection unit 2, and detects the canal hole C into which the detection unit 2 is to be inserted. This allows the detection unit 2 to be accurately inserted into the canal hole C captured by the video camera 17. The inspection device 1 is also provided with a remote control device 8 for remotely controlling the feeding device (the drive mechanism for the winding drum 4), the measuring device (the device for detecting the amount of rotation of the roller 6), and the moving device (the drive mechanism for the wheels 7), as well as the video camera 17. This remote control device 8 is equipped with a wireless transmitter / receiver, and the operating states of the drive mechanisms, detectors, video camera 17, etc. can be remotely controlled via this wireless transmitter / receiver.

[0020] In this embodiment, the video camera 17 is mounted on the inspection device 1, but the video camera 17 may be installed separately from the inspection device 1. Instead of using images captured by a camera, a well-known position measurement device may be used to align the position of the detection unit 2 with the position of the canal hole C. By using such a device, inspection of the canal hole C can be performed remotely during operation, as long as the temperature is below the heat resistance temperature of the device, thereby reducing the burden on workers and improving the efficiency of the inspection. The device configuration of this embodiment is one example, and the inspection device 1 according to the present invention can be designed in various ways. For example, the inspection device 1 may be suspended from a receiving hardware 16 and movable horizontally. Furthermore, multiple probes each consisting of a detection unit 2 and a support unit 3 may be provided, allowing inspection of multiple canal holes C to be performed simultaneously.

[0021] As outlined above, by unwinding the support part 3, the detection part 2 is fed from bottom to top within the canal hole C. If a clog is present inside the canal hole C, the detection part 2 will not advance any further, allowing the location of the clog to be detected. In other words, the insertion length of the support part 3 until a clog is detected is the distance from the bottom end of the canal hole C (effectively the bottom end of the receiving metal fitting 16). Then, by winding up the support part 3 and removing the detection part 2 from the canal hole C, the inspection of the canal hole C is completed. By performing this series of operations on the canal hole C that requires inspection, the state of the clog of bricks B can be determined. Here, a state in which the detection part 2 cannot pass through is defined as a "clog." This clog also includes areas where the canal hole C is narrowed. In this embodiment, it is possible to investigate the extent to which the canal hole C is clogged, i.e., the extent to which the canal hole C is narrowed.

[0022] As described above, the cross-sectional shape of the detection unit 2 in a direction perpendicular to the extension direction of the canal hole C is approximately circular. By making the horizontal cross section of the detection unit 2 circular, the size of the gap in the canal hole C can be detected based on whether the outer diameter of the detection unit 2 passes through the canal hole C, regardless of the orientation of the detection unit 2 within the canal hole C. When the size of the gap in the canal hole C through which gas flows is smaller than the outer diameter of the detection unit 2, the detection unit 2 cannot be inserted any further. Therefore, by changing the outer diameter of the detection unit 2, it can be estimated that the gap in the canal hole C is larger than the outer diameter of the detection unit 2 that allows it to pass through that area, and smaller than the outer diameter of the detection unit 2 that does not allow it to pass through, and the degree of narrowing of the canal hole C can be estimated. Furthermore, it is thought that the insertion length of the support unit 3 (including the detection unit 2) changes depending on the outer diameter of the detection unit 2. In other words, the larger the outer diameter of the detection unit 2, the greater the possibility that the insertion length of the support unit 3 will be shorter. Using this tendency, when multiple canal holes C are inspected using a detection unit 2 with a certain outer diameter, it can be estimated that the canal holes C with a smaller average insertion length are narrower than those with a larger average insertion length. Furthermore, by inspecting the same canal hole C using detection units 2 with multiple outer diameters, it is possible to evaluate the position and extent of narrowing of the canal hole C. Since the narrower the canal hole C, the greater the airflow resistance (pressure loss), by setting the outer diameter of the detection unit 2 according to the allowable pressure loss for the canal hole C, it is possible to estimate the position where the pressure loss exceeds the specified value based on the insertion length. Therefore, the position where this pressure loss exceeds the specified value can be defined as the repair boundary, and the bricks B above that can be repaired. While the allowable pressure loss varies depending on the hot stove 11 and operating conditions, it is generally preferable that the outer diameter of the detection unit 2 be between 50% and 80% of the inner diameter of the canal hole C.

[0023] The support unit 3 only needs to be rigid enough to feed the detection unit 2 into the canal hole C. On the other hand, it is preferable that the support unit 3 be easily deformed in a direction intersecting the extension direction to accommodate the support unit 3. To achieve both resistance to deformation of the support unit 3 when inserting the detection unit 2 and ease of deformation for accommodation within the investigation device 1, the support unit 3 may be inserted into the inner hole 9a of the tubular member 9. Figure 4 is a partial cross-sectional front view showing an example of the detection unit 2, support unit 3, and tubular member 9 applicable to the investigation device 1 of Figure 3. In this example, the tubular member 9 is composed of a straight cylindrical member. Multiple tubular members 9 are arranged along the extension direction of the support unit 3, and are insertable into the canal hole C together with the support unit 3 and movable in the extension direction of the support unit 3. Because the tubular member 9 is a straight cylindrical member, its cross-sectional shape perpendicular to the extension direction is ring-shaped. The maximum outer diameter of the cylindrical member 9 is smaller than the maximum outer diameter of the detection unit 2 so that the cylindrical member 9 does not come into contact with the clogged canal hole C before the detection unit 2 comes into contact with it.

[0024] This tubular member 9 is unwound together with the support part 3 when the detection part 2 is fed into the canal hole C. At that time, the lower tubular member 9 is pressed against the upper tubular member 9, and this is repeated in sequence until the upper tubular member 9 is pressed against the detection part 2. Therefore, even if the support part 3 does not have sufficient rigidity for unwinding, the detection part 2 is pushed by the tubular member 9 and fed into the canal hole C. On the other hand, when the support part 3 is being wound up, if the tubular members 9 are separated by moving along the support part 3 and a gap is created, the support part 3 can be curved or bent, and can be wound up onto the winding drum 4, for example. The length of this tubular member 9 is preferably about 5 to 20 cm, and a pipe made of a material with high strength and rigidity, such as a steel pipe, can be used.

[0025] FIG. 5 is a partial cross-sectional front view showing another example of the detection unit 2, support unit 3, and tubular member 9 applicable to the investigation device 1 of FIG. 3. This tubular member 9 also has the support unit 3 inserted into the inner hole 9a. Furthermore, multiple tubular members 9 are arranged along the extension direction of the support unit 3, and are insertable into the canal hole C together with the support unit 3 and movable in the extension direction of the support unit 3. Furthermore, the maximum outer diameter of the tubular member 9 is smaller than the maximum outer diameter of the detection unit 2 so that the tubular member 9 does not strike a clogged canal hole C before the detection unit 2 strikes it. This tubular member 9 also has a ring-shaped cross section in a direction perpendicular to the extension direction of the canal hole C, but its outer diameter is largest at the center in the extension direction and gradually tapers toward both ends in the extension direction. That is, the outer diameter of the tubular member 9 in this example is smaller than the maximum outer diameter at both ends in the extension direction. By doing so, both ends of the cylindrical member 9 are less likely to protrude radially where the cylindrical members 9 abut against each other. This reduces the possibility of contact with the inner surface of the canal hole C, making it easier to unwind and rewind the support part 3 and the cylindrical member 9. As a result, the efficiency of investigating the canal hole C is greatly improved.

[0026] FIG. 6 is a partial cross-sectional front view showing yet another example of the detection unit 2, support unit 3, and tubular member 9 applicable to the investigation device 1 of FIG. 3 . This tubular member 9 also has the support unit 3 inserted into the inner hole 9a. Furthermore, multiple tubular members 9 are arranged along the extension direction of the support unit 3, and are insertable into the canal hole C together with the support unit 3 and movable in the extension direction of the support unit 3. Furthermore, the maximum outer diameter of the tubular member 9 is smaller than the maximum outer diameter of the detection unit 2 so that the tubular member 9 does not strike a clogged canal hole C before the detection unit 2 strikes it. This tubular member 9 also has a ring-shaped cross section in a direction perpendicular to the extension direction of the canal hole C, but its outer diameter is greatest at the lower end in the figure and gradually tapers toward the upper end in the figure. That is, in this example, the outer diameter of one end in the extension direction of the tubular member 9 is smaller than the maximum outer diameter of the other end. Furthermore, in this example, a recess 10 is provided in the radial center of the lower end of the tubular member 9, i.e., the end in the elongation direction with the largest outer diameter, into which the upper end of the lower tubular member 9, i.e., the end in the elongation direction with the smallest outer diameter, fits. Therefore, the upper end of the lower tubular member 9 fits into the recess 10 at the lower end of the upper tubular member 9, and this continues in the elongation direction of the support part 3, engaging the upper and lower tubular members 9 at a predetermined radial position. This prevents both ends of the tubular members 9 from protruding radially where they abut against each other. This reduces the possibility of contact with the inner circumferential surface of the canal hole C, making it easier to unwind and rewind the support part 3 and the tubular member 9. As a result, the efficiency of investigating the canal hole C is significantly improved.

[0027] In this way, in this embodiment, the detection unit 2 together with the support unit 3 is inserted into the canal hole C of the stacked bricks B, and the length of insertion makes it possible to detect whether the canal hole C is clogged and at what position in the height direction the clog is. Therefore, it is possible to clearly determine which brick B among many bricks B stacked in the height direction is deteriorated and at what position, and as a result, it is possible to clearly determine the repair boundary of the deteriorated brick B.

[0028] Furthermore, by inserting the support part 3 into the inner hole 9a of the tubular member 9 that can be inserted into the canal hole C and making the tubular member 9 movable in the extension direction of the support part 3, it becomes possible to feed the detection part 2 into the canal hole C even if the support part 3 itself does not have the rigidity required to feed the detection part 2. Furthermore, by making the outer diameter of one or both ends of the tubular member 9 in the extension direction smaller than the maximum outer diameter, the possibility of contact between the inner surface of the canal hole C and the tubular member 9 can be reduced, thereby improving the efficiency of investigating the canal hole C.

[0029] In addition, by engaging the tubular members 9 arranged side by side in the extension direction of the support part 3 with each other at predetermined radial positions, the possibility of contact between the inner surface of the canal hole C and the tubular members 9 can be reduced, thereby improving the efficiency of investigation of the canal hole C. In addition, by making it possible to remotely control the feeding device that feeds the detection unit 2 together with the support unit 3 into the canal hole C, the measuring device that measures the insertion length of the support unit 3, and the moving device that moves the furnace bottom, the efficiency of investigating the canal hole C is improved and the burden on the worker is reduced.

[0030] The above describes the inspection device and method for hot stove thermal storage bricks according to the embodiment, but the present invention is not limited to the configuration described in the above embodiment, and various modifications are possible within the scope of the gist of the present invention. [Explanation of symbols]

[0031] 1. Survey equipment 2. Detection unit 3 Support part 4. Winding drum (feeding device) 6 Roller (measuring device) 7. Wheels (mobility device) 8 Remote Control Device 9 Cylindrical member 9a inner hole 11 Hot stove 13 Heat storage chamber B Brick (Gitter Brick) C Canal hole

Claims

1. This is a device for checking whether or not a canal hole provided in a heat storage brick of a hot stove is clogged and at what position in the height direction the clog is located. a detecting unit that can be inserted into the canal hole of the brick and has a substantially circular cross section perpendicular to the extension direction of the canal hole; a support part that supports the detection part, has the rigidity required to insert it into the canal hole, has a maximum dimension in a direction perpendicular to the extension direction of the canal hole that is smaller than the maximum outer diameter of the detection part in the direction perpendicular to the extension direction of the canal hole, is made of a strip that extends in the extension direction of the canal hole, and is deformable in a direction intersecting the extension direction.

2. The support portion is inserted into an inner hole of the tubular member, 2. The hot stove heat storage brick inspection device according to claim 1, wherein the cylindrical member is insertable into the canal hole, has a ring-shaped cross section in a direction perpendicular to the extension direction, has a maximum outer diameter smaller than the maximum outer diameter of the detection part, and is movable in the extension direction of the support part.

3. 3. The inspection device for hot stove regenerative bricks according to claim 2, wherein the cylindrical member has an outer diameter at one or both ends in the extension direction that is smaller than the maximum outer diameter.

4. 3. The hot stove regenerative brick inspection device according to claim 2, wherein the cylindrical members are arranged side by side in the extension direction of the support portion, and adjacent cylindrical members engage with each other at predetermined radial positions.

5. a feeding device that feeds the detection unit together with the support unit into the canal hole and removes it from the canal hole; a measuring device that measures the insertion length of the detection unit and the support unit until the detection unit can no longer be fed into the canal hole; a moving device for moving the furnace bottom of the hot stove; 2. The hot stove thermal storage brick inspection device according to claim 1, further comprising: a remote control device that enables remote control of the feeding device, the measuring device, and the moving device.

6. 6. A method for inspecting hot stove heat storage bricks, comprising inserting the detection unit into the canal hole from below using the inspection device for hot stove heat storage bricks according to claim 1, and detecting whether the canal hole is clogged and the location of the clog based on the length of insertion.

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