Falling object catcher and falling object catcher

Abstract

To provide a falling object receiving device and method that can reliably protect workers from falling objects while being compact. [Solution] A falling object receiving device 100 that can be installed inside a furnace comprises a balloon 1 that inflates when fluid is introduced, and a first net 2 positioned on the lower surface of the balloon 1, the first net 2 covering the inner region IN of the contour line 15 projected in the direction of gravity when the balloon 1 is inflated.

Description

Technical Field

[0001] The present invention relates to a falling object catcher and a falling object catching method for protecting workers from falling objects in a furnace such as an incinerator.

Background Art

[0002] Conventionally, when workers set up a scaffold for working inside a furnace such as an incinerator, a falling object catcher for protecting workers from falling objects such as clinkers adhering to the furnace wall is known (see, for example, Patent Document 1).

[0003] The falling object catcher (referred to as a furnace internal falling object protection device in the document) described in Patent Document 1 has a balloon that expands by supplying compressed air therein and is self-held in the furnace by the tension generated by the supply of this compressed air. This balloon directly catches falling objects on the upper surface by expanding.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When directly catching falling objects with a balloon as in the falling object catcher described in Patent Document 1, depending on the shape and weight of the falling objects, the balloon may be damaged and deflated, and there is a risk that the falling objects will fall toward the workers from the gap with the furnace wall. Also, to increase the strength of the balloon, the material cost increases and the size also becomes large.

[0006] Therefore, there is a demand for a falling object catcher and a falling object catching method that can reliably protect workers from falling objects while achieving compactification.

Means for Solving the Problems

[0007] The characteristic configuration of the falling object catcher according to the present invention is a falling object catcher that can be installed inside a furnace, comprising a balloon that inflates when fluid is introduced, and a first net disposed on the lower surface of the balloon, wherein the first net covers the area inside the contour line obtained by projecting the balloon in the direction of gravity when the balloon is inflated.

[0008] The falling object catcher in this configuration is installed inside the furnace and catches falling objects by inflating a balloon. In the event that the balloon is damaged, if a first net is provided to cover the area inside the outline of the balloon projected in the direction of gravity, as in this configuration, the falling object will be caught by the first net. As a result, even if the balloon is damaged, workers can be reliably protected from falling objects. Furthermore, because of the presence of the first net, it is not necessary to increase the strength of the balloon, allowing for a smaller size while reducing material costs. Thus, this falling object catcher is compact and reliably protects workers from falling objects.

[0009] Another characteristic feature is that a suspension member is connected to the first net, and when the balloon inflates while the first net is suspended by the suspension member, a portion of the first net is positioned between the inner wall of the furnace and the side of the balloon.

[0010] In this configuration, since the first net is suspended from the suspension member, it is easier to ensure the strength of the suspended member compared to when the balloon is suspended. Also, when the balloon is inflated, a part of the first net is positioned between the inner wall of the furnace and the side of the balloon, so the balloon is less likely to be damaged by clinker etc. adhering to the inner wall, and the strength of the balloon can be reduced. As a result, it is possible to make the entire falling object receiving device more compact and lighter in weight.

[0011] Another characteristic feature is that the first net is formed in a rectangular shape with all corners positioned outside the balloon, and these corners are suspended by the suspension members.

[0012] As in this configuration, if the first net is rectangular and all corners are suspended by suspension members, the falling object catchers can be suspended uniformly. Furthermore, when the balloon inflates, the corners of the first net are positioned between the inner wall of the furnace and the sides of the balloon so that they bend, making it less likely for the balloon to be damaged by clinker or other substances adhering to the inner wall.

[0013] Another characteristic feature is that, when the balloon inflates while the first net is suspended by the suspension member, the corner portion is positioned at the same height as the side surface of the balloon.

[0014] As in this configuration, when the corner of the first net is positioned between the inner wall of the furnace and the side of the balloon so that it can be bent, the posture of the falling object catcher can be stabilized if the corner is at the same height as the side. As a result, it is possible to reliably prevent problems such as falling objects falling towards workers through the gap between the falling object catcher and the inner wall of the furnace.

[0015] Another characteristic feature is that the balloon is formed in an annular shape with a central region that penetrates it.

[0016] As shown in this configuration, using an annular balloon with a central region that penetrates allows for a more compact and lighter falling object receiving device. Furthermore, having a central region that penetrates allows for ventilation of the working space below the balloon and reduces the pressure difference between the upper and lower spaces on either side of the balloon.

[0017] Another notable feature is the inclusion of a second net fixed to the upper surface of the balloon and covering the central region.

[0018] As in this configuration, by covering the central area of ​​the annular balloon with a second net, falling objects are dispersed and caught by the balloon and the second net. Even if the balloon and the second net are damaged, the first net below them will catch the falling objects. Furthermore, because the area occupied by the balloon can be reduced by the second net, the probability of falling objects contacting the relatively fragile balloon is reduced, and even if the second net is damaged, it can be replaced inexpensively.

[0019] A feature of the falling object receiving method according to the present invention is that a falling object receiving device is installed in a furnace, the device comprising a balloon that inflates when fluid is introduced into it, and a first net disposed on the lower surface of the balloon, and the method includes an insertion step of inserting the falling object receiving device into the furnace after connecting a suspension member to the first net, and an inflation step of inflating the balloon while the first net is suspended by the suspension member, wherein, as a result of the inflation step, the first net covers the area inside the contour line obtained by projecting the balloon in the direction of gravity when the balloon is inflated.

[0020] In this method, the falling object catcher is inserted into the furnace through an insertion process and an inflation process, and the balloon is inflated to catch falling objects. Even if the balloon is damaged, if a first net is provided that covers the area inside the outline of the balloon projected in the direction of gravity, as in this method, the falling object will be caught by the first net. As a result, workers can be reliably protected from falling objects even if the balloon is damaged. Furthermore, because of the presence of the first net, the strength of the balloon does not need to be increased, and it is easy to make it compact. Thus, this method of catching falling objects is compact while reliably protecting workers from falling objects. [Brief explanation of the drawing]

[0021] [Figure 1] This is a plan view of the falling object receiving device according to the first embodiment. [Figure 2] This is a rear view of the falling object receiving device according to the first embodiment. [Figure 3] This is a side view taken from the direction of arrow III in Figure 1. [Figure 4] It is a view taken in the direction of arrow IV-IV of FIG. 1. [Figure 5] It is a plan view of the falling object receiver according to the second embodiment. [Figure 6] It is a rear view of the falling object receiver according to the second embodiment. [Figure 7] It is a view taken in the direction of arrow VII-VII of FIG. 5. [Figure 8] It is a schematic view showing the falling object receiving method according to the first embodiment. [Figure 9] It is a schematic view showing the falling object receiving method according to the second embodiment.

Mode for Carrying Out the Invention

[0022] Hereinafter, embodiments of the falling object receiver and the falling object receiving method according to the present invention will be described based on the drawings. In this embodiment, an example in which the falling object receiver 100 is installed in the furnace of the incinerator X will be used for explanation. However, it is not limited to the following embodiments, and various modifications are possible without departing from the gist thereof.

[0023] As shown in FIG. 8 or FIG. 9, the falling object receiver 100 according to the present embodiment can be installed in the furnace of the incinerator X. When an operator performs cleaning work, inspection work, etc. in the furnace of the incinerator X, it is necessary to set up a temporary scaffold. However, on the furnace wall of the incinerator X (the inner wall Xa inside the furnace), there are deposits such as refractory materials and clinkers that have deteriorated and peeled off. The falling object receiver 100 is installed so that these do not fall and hit the operator.

[0024] As shown in Figures 1 to 9, the falling object catcher 100 comprises a balloon 1 that inflates when a fluid such as air is introduced, a first net 2 positioned on the underside of the balloon 1, and a second net 3 fixed to the upper surface of the balloon 1. The balloon 1 is normally deflated, but inflates when air is supplied from the air supply fan 11, performing the positioning and shape-maintaining functions of the first net 2 and the second net 3. The falling object catcher 100 catches falling objects by blocking the inside of the furnace when the balloon 1 is inflated. Note that the fluid supplied to the balloon 1 is not limited to air, but may be a gas other than air.

[0025] [First Embodiment] The falling object receiving device 100 according to the first embodiment will be explained using Figures 1 to 4. Figure 1 shows a plan view of the falling object receiving device 100, and Figure 2 shows a rear view of the falling object receiving device 100. Figure 3 shows a side view of the falling object receiving device 100 with the first net 2 suspended, and Figure 4 shows a view along the line IV-IV in Figure 1. The first net 2 located to the side of the balloon 1 is shown in solid lines before the first net 2 is suspended and in dashed lines after the first net 2 is suspended.

[0026] As shown by the dashed lines in Figures 1 to 4, the balloon 1 in this embodiment is formed in an annular shape (a so-called donut shape) with a central region 10 penetrating through it. Also, as shown in Figure 1, the balloon 1 has an air supply port 12 and an air outlet 13 on the upper surface of one side, and three blower valves that can adjust the amount of air from the air supply fan 11 are arranged in addition to a spare port 14. By adjusting the opening degree of each of these blower valves for the supply port 12 and the outlet 13, it is possible to continuously supply an amount of air that is sufficient to maintain the inflated shape of the balloon 1. Compressed air generated in the incinerator can also be supplied to the spare port 14. Note that the supply port 12 and the outlet 13 may be combined into one and supply and discharge may be performed at different times, the spare port 14 may be omitted, or the supply port 12, outlet 13 and spare port 14 may be provided on the bottom surface of the balloon 1, and the number and arrangement of air supply and discharge ports to the balloon 1 are not particularly limited.

[0027] The first net 2 covers the inner region IN of the circular contour line 15 projected onto the balloon 1 in the direction of gravity when the balloon 1 is inflated (see Figures 3-4). The first net 2 is made of resin with a mesh size of approximately 15 mm and can catch objects falling from the furnace wall (inner wall Xa inside the furnace) of the incinerator X. The first net 2 is formed in a rectangular shape with all corners 21 (four corners 21) positioned outside the balloon 1 (see Figure 1). These corners 21 are provided with connection parts 21a to which suspension members W, made of ropes or wires, are connected, and when the falling object catcher 100 is placed inside the furnace, it is suspended by the suspension members W (see dashed lines in Figures 1 and 4).

[0028] Furthermore, the first net 2 is woven into and fixed to the balloon 1 by multiple (eight in this embodiment) fixing points 22 (peckets, etc.) arranged at equal intervals along the contour line 15 of the balloon 1 (see Figure 2). In the falling object receiving device 100, which is placed inside the furnace and the balloon 1 is inflated with the first net 2 suspended by the suspension member W, Figure 3 shows a view from the direction of arrow III in Figure 1, and Figure 4 shows a view from the line IV-IV in Figure 1, which connects a pair of opposing corners 21. As shown in Figure 3, the first net 2 is bent so that the pair of corners 21 are at the same height as the side surface 16 of the balloon 1 and are at the uppermost position, and the five fixing points 22 (eight fixing points 22 including those not shown in the figure) are at the lowermost position, and the first net 2 is positioned on the furnace wall side (inner wall Xa side of the furnace) in a tent shape along the side surface 16 of the balloon 1. In other words, a portion of the first net 2 is located between the inner wall Xa of the furnace and the side surface 16 of the balloon 1, and as shown in Figure 4, a pair of corners 21 of the first net 2 cover the side surface 16 of the balloon 1. Here, "equal height" means that the pair of corners 21 should be in the range of 80% to 120% of the height of the side surface 16 of the balloon 1, preferably in the range of 90% to 110%. Note that in Figure 4, the gap between the inner wall Xa of the furnace and the side surface 16 of the balloon 1 is exaggerated, but in reality it is a gap through which falling objects cannot pass, and the furnace is sealed by the falling object receiving device 100.

[0029] As shown in Figure 1, the second net 3 is woven into and fixed to a plurality of grommets 17a provided in a rectangular woven section 17 on the upper surface of the balloon 1. As described above, the balloon 1 is an annular shape that penetrates the central region 10, and the second net 3 is formed in a rectangular shape that covers the central region 10. This second net 3, like the first net 2, is made of resin with a mesh size of about 15 mm and can catch falling objects from the furnace wall (inner wall Xa inside the furnace) of the incinerator X. As shown in Figure 4, when the falling object catcher 100 is installed inside the furnace and the balloon 1 is inflated, the falling objects are caught by the upper surface of the balloon 1 and the second net 3.

[0030] [Second Embodiment] The falling object receiving device 100 according to the second embodiment will be explained using Figures 5 to 7. As shown by the dashed lines in Figures 5 to 7, the balloon 1 in this embodiment is formed in a rectangular ring shape with a central region 10 passing through it. The balloon 1 is also provided with an air supply port 12 and an air outlet 13 on the upper surface of one side, and air valves that can adjust the amount of air from the air supply fan 11 are arranged in three locations, including a spare port 14. The configuration of the supply port 12, the outlet 13 and the spare port 14 is the same as in the first embodiment, so a detailed explanation will be omitted.

[0031] The first net 2 covers the inner region IN of the rectangular contour line 15, which is formed by projecting the balloon 1 in the direction of gravity when the balloon 1 is inflated (see Figure 7). The first net 2 is made of resin with a mesh size of approximately 15 mm and can catch objects falling from the furnace wall (inner wall Xa inside the furnace) of the incinerator X. As shown in Figure 5, the first net 2 is formed in a rectangular shape with all corners 21 (four corners 21) positioned outside the balloon 1. These corners 21 are provided with connection parts 21a to which suspension members W, made of ropes or wires, are connected, and when the object catcher 100 is placed inside the furnace, it is suspended by the suspension members W.

[0032] Furthermore, the first net 2 is woven into and fixed to the balloon 1 at multiple fixing points 22 (such as eaves) arranged at equal intervals along the contour line 15 of the balloon 1 (see Figure 6). In the falling object receiving device 100, which is placed inside the furnace and the balloon 1 is inflated with the first net 2 suspended by the suspension member W, Figure 7 shows the line VII-VII in Figure 5. As shown in Figure 7, the first net 2 is bent so that a pair of corners 21 are at the same height as the side surface 16 of the balloon 1 and are located at the uppermost position, and the woven portion 18 is located at the lower side, and the first net 2 is positioned along the side surface 16 of the balloon 1 toward the furnace wall side (the inner wall Xa side of the furnace). In other words, a part of the first net 2 is located between the inner wall Xa of the furnace and the side surface 16 of the balloon 1, and the first net 2 covers the side surface 16 of the balloon 1. As shown in Figure 5, in this embodiment, since the balloon 1 and the first net 2 are similar rectangular shapes, in the falling object receiving device 100 in which the balloon 1 is inflated with the first net 2 suspended by the suspension member W, the first net 2 shown by the dashed line in Figure 5 and the first net 2 shown by the solid line in Figure 7 will cover the entire area of ​​the side surface 16 of the balloon 1.

[0033] As shown in Figure 5, the second net 3 is woven into and fixed to a plurality of grommets 17a provided in a rectangular woven section 17 on the upper surface of the balloon 1. As described above, the balloon 1 is a rectangular ring that penetrates the central region 10, and the second net 3 is formed in a rectangular shape that covers the central region 10. This second net 3, like the first net 2, is made of resin with a mesh size of about 15 mm and can catch falling objects from the furnace wall (inner wall Xa inside the furnace) of the incinerator X. As shown in Figure 7, when the falling object catcher 100 is installed inside the furnace and the balloon 1 is inflated, the falling objects are caught by the upper surface of the balloon 1 and the second net 3.

[0034] [Effects and Effects] Even if balloon 1 or the second net 3 is damaged by a falling object, the falling object receiving device 100 of the first and second embodiments is provided with a first net 2 that covers the inner region IN of the contour line 15 projected onto balloon 1 in the direction of gravity, so the falling object is caught by the first net 2. As a result, even if balloon 1 or the second net 3 is damaged, workers can be reliably protected from falling objects. In addition, because of the presence of the first net 2, it is not necessary to increase the strength of balloon 1, and the size can be reduced while lowering material costs. In this way, the falling object receiving device 100 is compact and can reliably protect workers from falling objects.

[0035] In the first and second embodiments, since the first net 2 is suspended from the suspension member W, it is easier to ensure the strength of the suspended member compared to the case where the balloon 1 is suspended. Also, when the balloon 1 is inflated, a part of the first net 2 is located between the inner wall Xa of the furnace and the side surface 16 of the balloon 1, so the balloon 1 is less likely to be damaged by clinker etc. adhering to the inner wall Xa, and the strength of the balloon 1 can be reduced. As a result, it is possible to make the falling object receiving device 100 as a whole more compact and lighter in weight.

[0036] Furthermore, since the central region 10 of the annular balloon 1 is covered by the second net 3, falling objects are dispersed and caught by balloon 1 and the second net 3, and even if balloon 1 and the second net 3 are damaged, the first net 2 located below them will catch the falling objects. In addition, because the area occupied by balloon 1 can be reduced by the second net 3, the probability of falling objects contacting the relatively fragile balloon 1 is reduced, and even if the second net 3 is damaged, it can be replaced inexpensively. By reducing the area occupied by balloon 1, the air supply time for inflating balloon 1 and the air discharge time for deflating balloon 1 can be shortened. Because the first net 2 and the second net 3 are positioned in the central region 10 through which balloon 1 is penetrated, ventilation of the upper and lower spaces is possible, and since balloon 1 only needs to function as a positioning element for the first net 2, it can be minimized, further reducing the differential pressure in the upper and lower spaces surrounding balloon 1. For example, when multiple stages of falling object catchers 100 are installed in a furnace, the area occupied by balloon 1 can be reduced, further reducing the differential pressure inside the furnace.

[0037] Since the first net 2 is rectangular and its corners 21 are suspended by the suspension member W, the falling object catcher 100 can be suspended uniformly. Furthermore, when the balloon 1 is inflated, the corners 21 of the first net 2 are positioned between the inner wall Xa of the furnace and the side surface 16 of the balloon 1 so that they can be bent, making it difficult for the balloon 1 to be damaged by clinker or the like adhering to the inner wall Xa. Moreover, when the corners 21 of the first net 2 are positioned between the inner wall Xa of the furnace and the side surface 16 of the balloon 1 so that they can be bent, the corners 21 are at the same height as the side surface 16, which makes it possible to stabilize the posture of the falling object catcher 100. As a result, it is possible to reliably prevent the inconvenience of falling objects falling towards workers through the gap between the falling object catcher 100 and the inner wall Xa of the furnace.

[0038] [How to catch falling objects] A method for receiving falling objects, in which the above-described falling object receiving device 100 is installed inside the furnace, will be explained using Figures 8 to 9. In this embodiment, the falling object receiving method uses the falling object receiving device 100 to receive falling objects such as deteriorated and peeled refractory material and clinker attached to the furnace wall of the incinerator X, thereby protecting workers performing work inside the furnace. In Figures 8 to 9, the gap between the inner wall Xa inside the furnace and the side surface 16 of the balloon 1 is exaggerated, but in reality, it is a gap that falling objects cannot pass through, and the inside of the furnace is blocked by the falling object receiving device 100.

[0039] Figure 8 shows an incinerator X (first embodiment) in which a suspension member W is suspended using an inspection window Xb on the top wall, and Figure 9 shows an incinerator X (second embodiment) in which a suspension member W is suspended using a nozzle opening or inspection opening (hereinafter referred to as a nozzle opening Xc) on the furnace wall. The falling object receiving method for installing a falling object receiving device 100 inside the furnace includes an insertion step of connecting the suspension member W to the first net 2 and then inserting the falling object receiving device 100 into the furnace, and an inflation step of inflating the balloon 1 while the first net 2 is suspended by the suspension member W.

[0040] In the insertion process, with the balloon 1 of the falling object catcher 100 deflated, a suspension member W, suspended by a winch (not shown) or the like (shown in the image) from the inspection window Xb or nozzle opening Xc, is pulled out of the manhole Xd and connected to the connection part 21a of the first net 2. Next, the falling object catcher 100 with the suspension member W connected is inserted into the furnace from the manhole Xd, and in the inflation process, the balloon 1 is inflated by the air supply fan 11 while adjusting the opening of the air blower valve. In this inflation process, the first net 2 covers the inner region IN of the contour line 15 projected onto the balloon 1 in the direction of gravity when the balloon 1 is inflated. Furthermore, the first net 2 is supported by the balloon 1 in a folded state such that a pair of corners 21 of the first net 2 are positioned at the highest point, at the same height as the side surface 16 of the balloon 1.

[0041] As the temporary scaffolding is erected and work is carried out inside the furnace, the suspension member W is raised using a winch or the like, raising the falling object catcher 100 suspended from the suspension member W. After the work inside the furnace is completed by raising and lowering the suspension member W using the winch or the like, the air supply fan 11 is stopped to deflate the balloon 1, and the now smaller falling object catcher 100 is removed from the manhole Xd. In this way, since the falling object catcher 100 is in a deflated state when it is taken in and out of the manhole Xd, the work of installing the falling object catcher 100 inside the furnace is easy.

[0042] In this method, the falling object catcher 100 is inserted into the furnace through an insertion process and an inflation process, and the balloon 1 is inflated to catch the falling object. Even if the balloon 1 is damaged, as in this method, a first net 2 is provided that covers the inner region IN of the contour line 15 projected onto the balloon 1 in the direction of gravity, so the falling object will be caught by the first net 2. As a result, even if the balloon 1 is damaged, workers can be reliably protected from falling objects. In addition, because of the first net 2, it is not necessary to increase the strength of the balloon 1, and it is easy to make it compact. Thus, this falling object catcher method is compact while reliably protecting workers from falling objects.

[0043] [Other embodiments] (1) In the above-described embodiment, the balloon 1 is of a size that allows it to be positioned on the first net 2, and in a plan view, the area occupied by the balloon 1 relative to the falling object catcher 100 should be 1 / 20 to 1 / 3, preferably 1 / 10 to 1 / 5. In this way, the falling object catcher 100 in this embodiment can be made lighter and more compact by making the balloon 1 smaller. (2) In the embodiment described above, the balloon 1 may be provided with a protective sheet on its side surface 16. In this case, when the balloon 1 is inflated while the first net 2 is suspended by the suspension member W, the portion of the side surface 16 of the balloon 1 that is not covered by the first net 2 will also be less likely to be damaged by clinker or the like adhering to the inner wall Xa. (3) The balloon 1 in the above-described embodiment is not limited to an annular or rectangular annular shape through which the central region 10 penetrates, but may also be cylindrical or polygonal in shape in which the central region 10 does not penetrate. In other words, when the balloon 1 is inflated with the first net 2 suspended by the suspension member W, it may be any shape as long as a part of the first net 2 covers the side surface 16 of the balloon 1. In this case, the second net 3 may be omitted. (4) In the embodiments described above, the first net 2 and the second net 3 were made of resin with a mesh size of about 15 mm, but they can be made of a flexible material with a mesh size that can capture falling objects. Also, the first net 2 and the second net 3 are not limited to a rectangular shape, but can be any shape such as a circular shape or a polygonal shape.

[0044] (5) In the embodiment described above, the rope diameter around the perimeter (outer circumference) of the net used to suspend the first net 2 is large, while the inner part of the first net 2 has a thin fiber rope diameter of about 2 to 4 m. In other words, the outer rope diameter of the first net 2 is larger than the inner rope diameter, and the net strength inside the first net 2 is lower than that of the outer circumference. For this reason, the weaving strength may be such that the fixing point 22, which has the function of positioning the first net 2 relative to the balloon 1, is not subjected to excessive load and is not damaged, so that the fixing point 22 comes off when a predetermined load is applied by a falling object. (6) In the embodiment described above, the first net 2 only needs to cover the inner region IN of the contour line 15 projected onto the balloon 1 in the direction of gravity when the balloon 1 is inflated, and may be the same size as the contour line 15 of the balloon 1. In this case, the first net 2 will be suspended from the suspension member W without covering the side surface 16 of the balloon 1. (7) The second net 3 in the above-described embodiment can be made of an inexpensive net so that it can be processed into a circular or polygonal shape.

[0045] (8) In the embodiments described above, the first net 2 and the second net 3 may have sheets attached to a portion of their upper surfaces so that they can also capture fine dust. In this case, it is preferable that the sheet arrangement of the first net 2 and the sheet arrangement of the second net 3 be in a staggered arrangement so that they are alternating in a plan view. (9) A load cell (weight measuring device) may be provided to the falling object receiving device 100 in the above-described embodiment. In this case, after installing the falling object receiving device 100 inside the furnace and inflating the balloon 1, it is possible to perform tasks such as checking for the fall of clinker, checking the fall location, and predicting hazards. (10) In the embodiment described above, the falling object receiving device 100 may have an annular net fixed to the side surface 16 of the balloon 1 so as not to interfere with the first net 2, and hanging down below the balloon 1 so that the annular net is visible to the side of the worker performing work inside the furnace. In this case, even if clinker or the like remains on the furnace wall below the falling object receiving device 100, the worker will be protected from falling objects such as clinker by this annular net. (11) In the embodiments described above, an example of an incinerator X was used, but the furnace is not particularly limited as long as it involves in-furnace work such as a melting furnace. [Industrial applicability]

[0046] The present invention can be used in falling object catchers and falling object catchers for protecting workers from falling objects inside furnaces such as incinerators. [Explanation of Symbols]

[0047] 1: Balloon 2: Daiichi Net 3: Second Net 10: Central area 15: Outline 16: Side view 21: Corner 100: Falling object catcher IN: Inner area W: Suspension member Xa: Interior wall

Claims

1. A falling object catcher that can be installed inside a furnace, A balloon that inflates when fluid is introduced, The balloon comprises a first net positioned on the lower surface of the balloon, The first net is a falling object catcher that covers the area inside the contour line obtained by projecting the balloon in the direction of gravity when the balloon is inflated.

2. A suspension member is connected to the first net. The falling object receiving device according to claim 1, wherein the balloon inflates while the first net is suspended by the suspension member, so that a part of the first net is positioned between the inner wall of the furnace and the side surface of the balloon.

3. The first net is formed in a rectangular shape with all corners positioned outside the balloon. The falling object receiving device according to claim 2, wherein the aforementioned corner portion is suspended by the suspension member.

4. The falling object receiving device according to claim 3, wherein the balloon inflates while the first net is suspended by the suspension member, so that the corner portion is at the same height as the side surface of the balloon.

5. The falling object receiving device according to any one of claims 1 to 4, wherein the balloon is formed in an annular shape with a central region penetrating it.

6. The falling object receiving device according to claim 5, further comprising a second net fixed to the upper surface of the balloon and covering the central region.

7. A method for receiving falling objects, comprising installing a falling object receiving device inside a furnace, the device comprising a balloon that inflates when fluid is introduced into it, and a first net positioned on the lower surface of the balloon, After connecting the suspension member to the first net, the insertion step involves inserting the falling object receiving device into the furnace. The process includes an inflation step of inflating the balloon while the first net is suspended by the suspension member, A method for receiving falling objects, wherein, as a result of the inflation process, the first net covers the area inside the contour line obtained by projecting the balloon in the direction of gravity when the balloon is inflated.

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