JP2019143924A - Inner-furnace falling object protection device and installation method thereof - Google Patents

Abstract

To provide an inner-furnace falling object projection device capable of securely receiving a falling object fallen from an inner-furnace upper part, and an installation method thereof.SOLUTION: A compressed air is fed into a balloon 21 in a furnace to cause expansion, and the balloon is self-held in the furnace with the tension generated by the feed of the compressed air.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to a fallen object protection apparatus in a furnace and a method for installing the apparatus in order to protect an operator from falling objects such as a peeled refractory material when working in a furnace such as a melting furnace or a combustion chamber. .

  When working in the furnace, refractory materials that have deteriorated and peeled off from the upper part of the furnace and deposits in the furnace (clinker, dust lump, etc.) fall, and there is a concern that the fallen objects such as refractory materials may hit workers. . Therefore, in general, before entering the furnace, the operator visually confirms that there is no object that is likely to fall, and if necessary, removes it using long objects or compressed air before entering the furnace. As a fallen object curing, a temporary scaffold was built. However, with this conventional method, in addition to the time required to start the in-furnace inspection / maintenance work, there were some concerns about safety during the work of constructing a temporary scaffold.

  On the other hand, a technique of installing a balloon (airbag) in a furnace instead of building a temporary scaffold as falling object curing is also known (for example, Patent Documents 1 and 2). However, these conventional balloons are all inflated in a state where they are placed on a support member, and when inflated, the outer surface of the balloon is in close contact with the inner wall of the furnace, but its adhesion (tension) is small. In this case, when a heavy fallen object falls from the upper part in the furnace, the fallen object is once received by the balloon, but moves to the outer surface side of the balloon according to the shape of the upper surface of the balloon. Then, since the adhesion force between the outer surface of the balloon and the inner wall of the furnace is small, this adhesion force loses the gravity of the fallen object, so that the fallen object slides down between the outer surface of the balloon and the inner wall of the furnace. There is a risk of falling down. Some fallen objects such as refractory materials and furnace deposits falling from the upper part of the furnace have a weight of over 10 kg. When such a heavy object falls, the conventional balloon cannot accept it as described above, and is placed below the balloon. There is a risk of falling.

Japanese Patent Laid-Open No. 5-113293 JP 2014-136892 A

  The problem to be solved by the present invention is to provide an in-furnace falling object protection device and its installation method capable of reliably receiving the falling object falling from the upper part of the furnace.

According to the present invention, the following (1) to (5) in-furnace falling object protection devices and (5) to (9) in-furnace falling object protection devices are provided.
(1)
A falling object protective device installed in the furnace to receive the falling object,
An in-furnace falling object protection device having a balloon that expands by supplying compressed air therein and is self-held in the furnace by tension generated by the supply of the compressed air.
(2)
Each of the balloons has an outer eyelet row arranged on the upper surface and the lower surface so as to follow the outer shape when the balloon is inflated, and at least one arranged so as to follow the outer shape inside the outer eyelet row. The in-furnace fall object protection device according to (1), further including an inner eyelet row, wherein the size of the outer shape of the balloon when the balloon is inflated can be adjusted by tying up adjacent eyelet rows.
(3)
The balloon falling object protection device according to (1) or (2), wherein when the balloon is inflated, a through hole is formed in a central portion, and a net is provided in the through hole.
(4)
The in-furnace fall object protection device according to any one of (1) to (3), wherein the balloon is made of tarpaulin on the upper surface, lightweight tarpaulin whose outer surface is thinner and lighter than the tarpaulin, and nylon fabric on the lower surface.
(5)
The falling object protection apparatus in a furnace according to any one of (1) to (4), wherein an illuminating unit that illuminates toward the lower surface side is installed inside the balloon.
(6)
(1) It is the installation method of the falling object protection apparatus in a furnace which installs the falling object protection apparatus in a furnace in any one of (5) in a furnace,
A method for installing a falling object protection apparatus in a furnace, wherein the balloon is expanded by supplying compressed air to the inside of the balloon in a furnace, and the balloon is self-held in the furnace by a tension generated by the supply of the compressed air.
(7)
Before inflating the balloon, the size of the outer shape when the balloon is inflated by tying up adjacent eyelet rows is in the range of 1.05 times to 1.25 times the size of the in-furnace shape. The method for installing the falling object protective device in the furnace according to (6), wherein adjustment is performed so that
(8)
Before inflating the balloon, the balloon is suspended by a wire rope in the furnace, and after adjusting the height position of the balloon in the furnace by winding or lowering the wire rope, the balloon is inflated. The installation method of the fallen object protection apparatus in a furnace as described in 6) or (7).
(9)
The tip of the wire rope in the furnace is taken out of the furnace through a working opening provided in the furnace, the tip of the wire rope and the balloon are connected, and the balloon is inserted into the furnace from the opening. In order to supply compressed air to the balloon, the front end of the compressed air supply duct connected to the balloon is left outside the furnace at the time of this charging. The method for installing the fallen object protection apparatus according to (8), wherein compressed air is supplied from the inside.

  According to the in-furnace falling object protection apparatus of (1), since the balloon adheres to the furnace inner wall with such a strong adhesion that it can be held in the furnace, the falling object is between the outer surface of the balloon and the inner wall of the furnace. Can be prevented from slipping down, and the fallen object can be reliably received.

According to the in-furnace falling object protection device of (2), the size of the outer shape of the balloon when it is inflated can be adjusted to be appropriate to the size of the shape of the furnace in which the balloon is installed. Therefore, the fallen object falling from the upper part in the furnace can be received more reliably.
Naturally, the size of the outer shape of the balloon when it is inflated is larger than the size of the inner shape of the furnace in which the balloon is installed, but if this is too large, the outer shape of the balloon will be distorted when the balloon is inflated in the furnace. As a result, a gap may be formed between the outer surface of the balloon and the inner wall of the furnace, or a portion having a weak adhesion may be partially formed. On the other hand, according to the in-furnace falling object protection apparatus of (2), the outer shape of the balloon can be reduced because the size of the outer shape when the balloon is inflated can be reduced by binding adjacent eyelet rows. And the inner wall of the furnace can be securely adhered with strong adhesion. Thereby, the fallen object falling from the upper part in a furnace can be received more reliably.

According to the in-furnace falling object protection apparatus of (3), the working space below the balloon can be ventilated by an existing or temporary blower or the like through the through hole in the center. Further, since the net is provided in the central through hole, falling objects can be prevented from falling downward from the through hole without impairing ventilation.
In addition, this through-hole tends to collapse and shrink during expansion as the size of the outer shape at the time of expansion of the balloon is larger than the size of the shape within the furnace. If the size of the outer shape when the balloon is inflated can be reduced by constricting, the size of the through hole can be sufficiently secured.

According to the in-furnace falling object protection apparatus of (4), by using different balloon materials, it is possible to reduce the weight while ensuring the strength necessary for reliably receiving the falling object. In other words, the upper surface that directly receives falling objects is tarpaulin, which is a high-strength material, and the outer surface is in close contact with the inner wall of the furnace, but does not directly receive falling objects, so it is thinner and lighter than the tarpaulin used on the upper surface. It is tarpaulin, and it does not need high strength for the lower surface that does not directly catch falling objects and does not adhere to the inner wall of the furnace, so it is necessary to make sure that falling objects are reliably received by using a nylon fabric that is lighter than lightweight tarpaulins. It is possible to reduce the weight while securing the strength.
When the balloon has a through hole at the center as in (3), the inner surface of the balloon is preferably made of the same nylon fabric as the lower surface.

According to the in-furnace fallen object protection apparatus of (5), the work space under the balloon can be illuminated, which is particularly effective when the work space is dark. Moreover, since the illumination means is installed inside the balloon, the illumination means can be prevented from being damaged in the furnace.
When the illumination means is installed inside the balloon to illuminate the work space below the balloon, at least a part of the lower surface of the balloon needs to be made of a translucent material. If the material of the lower surface is made of nylon fabric, the lower working space can be illuminated without any problem while reducing the weight.

  According to the installation method of the falling object protection device in the furnace of (6), since the balloon is in close contact with the inner wall of the furnace with such a strong adhesion force that the balloon is self-held in the furnace, the falling object is It is possible to prevent sliding between the outer surface of the balloon and the inner wall of the furnace, and to reliably receive the fallen object.

  According to the installation method of the falling object protection device in the furnace of (7), the size of the outer shape when the balloon is inflated is set to an appropriate size with respect to the size of the shape of the furnace in which the balloon is installed. Specifically, by adjusting it to be in the range of 1.05 times or more and 1.25 times or less with respect to the size of the shape in the furnace, as described in the above (2), the fall falling from the upper part in the furnace You can catch things more reliably.

  According to the installation method of the falling object protection device in the furnace of (8), since the balloon can be installed at an arbitrary height position in the furnace, the usefulness of the falling object protection device in the furnace is improved. In the present invention, since the balloon is self-held in the furnace, the balloon can be easily installed at an arbitrary height position in the furnace without a support member.

  According to the method for installing the falling object protection apparatus in the furnace of (9), the balloon can be installed in the furnace without any operator entering the furnace.

  As described above, according to the present invention, it is possible to reliably receive a falling object falling from the upper part in the furnace.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view which shows notionally the state which installed the falling object protection apparatus in the furnace which is one Embodiment of this invention in the furnace. The top view of the falling object protection apparatus in a furnace which is one Embodiment of this invention shown in FIG. The front view of the falling object protection apparatus in a furnace shown in FIG. FIG. 4 is an AA arrow view of FIG. 3. The schematic perspective view of the falling object protection apparatus in a furnace shown in FIG. It is explanatory drawing which shows the point which adjusts the size of the outline shape at the time of expansion | swelling of the balloon of the falling object protection apparatus in a furnace shown in FIG. 2, (a) Before adjustment of a magnitude | size, (b) is adjustment of a magnitude | size. rear.

FIG. 1 conceptually shows a state in which a falling object protection apparatus in a furnace according to an embodiment of the present invention is installed in a furnace by a longitudinal section.
The furnace 10 has a cylindrical straight body 11 and an inverted frustoconical furnace bottom 12, and the internal diameter (in-furnace diameter) of the straight body 11 is about 3000 to 6500 mm. A refractory material is applied to the inner wall of the furnace 10 (furnace inner wall), and furnace deposits 13 such as clinker and dust lump are attached to the furnace inner wall.
And the falling object protection apparatus 20 in the furnace which is one Embodiment of this invention is installed in the inside (furnace) of this furnace 10. FIG.

2 to 5 show the fallen object protection device 20 in the furnace. FIG. 2 is a plan view, FIG. 3 is a front view, FIG. 4 is a view taken along the line AA in FIG. is there. In FIG. 5, eyelets (eyelet rows) to be described later are omitted or simplified.
This falling object protective device 20 has a balloon 21 that expands by supplying compressed air. 2 to 5 show the balloon 21 in an inflated state.

  Two compressed air supply ducts 22 are connected to the upper surface of the balloon 21 to supply compressed air. The compressed air supply duct 22 also serves as an air discharge duct when the balloon 21 is deflated by extracting air from the balloon 21. The number of the compressed air supply ducts 22 may be one, but if a plurality of compressed air supply ducts 22 are provided, a work opening (upper manhole) provided in the upper part of the furnace 10 as shown in FIG. The compressed air supplied from the compressed air supply fan 30 outside the furnace can be easily supplied to the balloon 21 by using one or a plurality of compressed air supply ducts 22 close to 14). The compressed air supply duct 22 that is not used at the time of supplying compressed air may be sealed with a stopper or the like.

  When the balloon 21 is inflated, a through-hole 23 is formed in the central portion to form a donut shape. The through-hole 23 is provided with a net 24. The net 24 may be provided at any position in the height direction of the through-hole 23, and may be provided in a number other than one. The material (material) of the net 24 can be, for example, polyethylene having a diameter of 2 mm, and the mesh size can be, for example, 25 mm.

  Inside the balloon 21, an LED light 25 is installed as an illumination means. In this embodiment, as shown in FIG. 4, eight LED lights 25 are installed on the outer surface of the balloon 21 at equal intervals along the circumferential direction so as to illuminate the lower surface side of the balloon 21. Has been. The eight LED lights 25 can be connected in series, for example, and the chuck 26 on the inner surface of the balloon 21 can be opened and inserted into the balloon 21 through the opening. In addition, the electric wire (illustration omitted) which supplies electric power to each LED light 25 can be pulled out from the chuck | zipper 26 part.

The balloon 21 includes an outer eyelet row 27A and three inner eyelet rows 27B to C on the upper surface and the lower surface, respectively.
Specifically, the outer eyelet row 27A has a plurality of outer grommet rows 27A along the outer shape (outermost shape) of the balloon 21 so as to follow the outer shape of the balloon 21 when inflated (hereinafter simply referred to as “the outer shape of the balloon 21”). The eyelets 27 are arranged.
The inner eyelet row 27B (hereinafter referred to as “first inner eyelet row 27B”) is a plurality of eyelets 27 arranged so as to follow the outer shape of the balloon 21 inside the outer eyelet row 27A.
The inner eyelet row 27C (hereinafter referred to as “second inner eyelet row 27C”) is a plurality of eyelets 27 arranged so as to follow the outer shape of the balloon 21 inside the first inner eyelet row 27B.
The inner eyelet row 27D (hereinafter referred to as “third inner eyelet row 27D”) is a plurality of eyelets 27 arranged so as to follow the outer shape of the balloon 21 inside the second inner eyelet row 27C.

As described above, each of the eyelet rows 27A to 27D is configured by arranging a plurality of eyelets 27 so as to follow the outer shape of the balloon 21, and in this embodiment, the outer shape of the balloon 21 is a circle, so that each eyelet row 27A to 27A to 27D. D is arranged concentrically. Further, in this concentric arrangement, the diameters of the eyelet rows 27A to 27D are smaller in the order of the outer eyelet row 27A, the first inner eyelet row 27B, the second inner eyelet row 27C, and the third inner eyelet row 27B. As an example, in this embodiment, the diameter of the outer eyelet row 27A is the same as the outer shape of the balloon 21 and is 6800 mm, the diameter of the first inner eyelet row 27B is 6000 mm, the diameter of the second inner eyelet row 27C is 5000 mm, The diameter of the third inner eyelet row 27D is 4000 mm.
The diameters of the eyelet rows 27A to 27D on the upper surface of the balloon 21 and the diameters of the eyelet rows 27A to 27D on the lower surface of the balloon 21 are the same. In other words, the eyelet rows 27A to 27D on the upper surface of the balloon 21 and the eyelet rows 27A to 27D on the lower surface of the balloon 21 are arranged so as to overlap each other when viewed from above and below.
In this embodiment, 64 eyelets 27 are arranged at equal intervals (approximately 5.6 ° intervals) in each eyelet row 27A to D.

Thus, the balloon 21 of this embodiment includes the outer eyelet row 27A and the three inner eyelet rows 27B to D, so that the size (diameter) of the outer shape when the balloon 21 is inflated can be adjusted in four stages. is there.
That is, when the eyelet rows 27A to 27D are not bundled at all, the diameter becomes the largest as shown in FIGS. 2 and 6A (the diameter at this time is 6800 mm as described above).
Next, as shown in FIG. 6 (b), the outer eyelet row 27A and the first inner eyelet row 27B are bundled, so that the size (diameter) of the outer shape when the balloon 21 is inflated is first. The inner grommet row 27B becomes smaller in diameter (6000 mm).
If the outer eyelet row 27A, the first inner eyelet row 27B, and the second inner eyelet row 27C are bundled, the size (diameter) of the outer shape of the balloon 21 when inflated is the same as that of the second inner eyelet row 27C. The diameter decreases to 5000 mm. Furthermore, if the outer eyelet row 27A, the first inner eyelet row 27B, the second inner eyelet row 27C, and the third inner eyelet row 27D are combined, the size (diameter) of the outer shape when the balloon 21 is inflated is The diameter is reduced to the diameter (4000 mm) of the third inner eyelet row 27D.
As described above, in the balloon 21 of this embodiment, the size (diameter) of the outer shape at the time of expansion is changed to four stages of 6800 mm, 6000 mm, 5000 mm, and 4000 mm by changing the combination of the adjacent eyelet rows 27A to 27D. Is possible. The balloon 21 has a thickness (height) when inflated of 1000 mm.

  Here, when the adjacent eyelet rows 27A to 27D are bundled, for example, as shown in an enlarged view in FIG. 6B, the eyelet 27 of the outer eyelet row 27A and the first inner eyelet row 27B adjacent thereto. What is necessary is just to tie together the eyelet 27 of this with the rope 28. However, the method of tying up adjacent eyelet rows is not limited to this. For example, the eyelet rows may be bound not by a pair of eyelet units as shown in FIG. Further, in this embodiment, the outer eyelet rows are sequentially bundled into the inner eyelet rows, but the order in which adjacent eyelet rows are bundled is not limited to this embodiment.

As described above, in this embodiment, the size (diameter) of the outer shape of the balloon 21 when inflated can be changed in four stages of 6800 mm, 6000 mm, 5000 mm, and 4000 mm. The test of installation in a furnace with an in-furnace diameter of 4180 mm was repeated while changing the shape diameter, and it was preferable to set the outer diameter of the balloon when inflated to a range of “in-furnace diameter + 300 to 1000 mm” I understood. Converting this as a ratio of size, the size of the outer shape when the balloon is inflated is 4480 / 4180≈1.05 times or more and 5180 / 4180≈1.25 times or less than the size of the shape in the furnace. It can be said that it is preferable to set in the range.
That is, if the size of the outer shape when the balloon is inflated is too small with respect to the size of the shape in the furnace, it is difficult to realize the above-mentioned “self-holding”. On the other hand, if the size of the outer shape when the balloon is inflated is too large relative to the size of the inner shape of the furnace, as described above, when the balloon is inflated in the furnace, the outer shape becomes an irregular shape. There is a possibility that a gap may be formed between the outer side surface and the inner wall of the furnace, or a part having a weak adhesion force may be generated.

  In this embodiment, three inner eyelet rows are provided, but at least one inner eyelet row is sufficient in the present invention. That is, if there is one inner eyelet row, the size (diameter) of the outer shape when the balloon is inflated can be adjusted in at least two stages by binding the inner eyelet row and the outer eyelet row. At this time, if the inner eyelet row and the outer eyelet row are not completely bundled, but the inner eyelet row and the outer eyelet row are bundled leaving a predetermined interval, and the predetermined interval is adjusted, The size (diameter) of the outer shape when the balloon is inflated can be adjusted in more stages. However, since it takes time and effort to tie the inner eyelet row and the outer eyelet row leaving a predetermined distance, the size (diameter) of the outer shape when the balloon is inflated can be set in many steps with a simple operation. In order to make the adjustment possible, it is preferable to provide a plurality of inner eyelet rows.

  In this embodiment, the outer shape of the balloon 21 is a circle according to the shape in the furnace. However, if the shape in the furnace is different, the shape is appropriately changed according to the shape, and may be an ellipse or a rectangle, for example. In this case, the outer eyelet row and the inner eyelet row also have an ellipse or a quadrangle following the outer shape of the balloon.

  Next, the material of the balloon 21 will be described. In this embodiment, the upper surface of the balloon 21 is tarpaulin, the outer surface is a lightweight tarpaulin, and the lower and inner surfaces are nylon fabric. Details of each material are as shown in Table 1. Tarpaulin (lightweight tarpaulin) is a composite sheet in which a fiber cloth is sandwiched between soft synthetic resin films. Table 1 shows the thickness, weight, and tear strength.

  In this way, by properly using the material of the balloon 21, it is possible to reduce the weight while ensuring the strength necessary for reliably receiving the falling object. In other words, the upper surface that directly receives falling objects is tarpaulin, which is a high-strength material, and the outer surface is in close contact with the inner wall of the furnace, but does not directly receive falling objects, so it is thinner and lighter than the tarpaulin used on the upper surface. Tarpaulin, which does not receive falling objects directly or adheres to the inner wall of the furnace, high strength is not required for the lower and inner surfaces, so by using a nylon fabric that is lighter than a lightweight tarpaulin, the falling objects are reliably received. It is possible to reduce the weight while ensuring the necessary strength. As a specific example of weight reduction, the weight of the balloon formed entirely with the tarpaulin shown in Table 1 exceeded 100 kg. By using different materials as described above, the weight decreased to about 60 kg. % Weight reduction is achieved.

  Next, a method for installing the balloon 21 (furnace falling object protection device 20) in the furnace will be described.

  In this embodiment, the balloon 21 is inserted into the furnace from the upper manhole 14 shown in FIG. 1, and in the state where the balloon 21 is deflated before charging, the outer diameter of the balloon 21 when inflated is the diameter in the furnace. To an appropriate range ("inner furnace diameter +300 to 1000 mm"). Adjustment of the diameter of the outer shape at the time of inflation of the balloon 21 is performed by changing the combination of the adjacent eyelet rows 27A to 27D as described above. For example, when the furnace inner diameter is 4180 mm, the appropriate range of the outer diameter of the balloon 21 when it is inflated is 4480 to 5180 mm. Therefore, the outer eyelet row 27A, the first inner eyelet row 27B, and the second inner eyelet By concatenating the row 27C, the diameter of the outer shape when the balloon 21 is inflated is set to 5000 mm.

  On the other hand, as shown in FIG. 1, a winch 40 is installed at the furnace top of the furnace 10 in order to adjust the height position of the balloon 21 in the furnace, and the wire rope 41 passes from the winch 40 into the furnace. It is drooping. Therefore, using a long object or the like, the tip of the wire rope 40 in the furnace is taken out of the furnace from the upper manhole 14, and the tip of the wire rope 41 and the balloon 21 are connected by a connector or the like (not shown). To do. Thereafter, the balloon 21 is charged into the furnace from the upper manhole 14. At this time, the tip of the compressed air supply duct 22 connected to supply the compressed air to the balloon 21 is left outside the furnace, and the compressed air extending from the tip of the compressed air supply duct 22 and the compressed air supply fan 30 is left. The tip of the air duct 31 is connected by a connector 32 or the like.

  In this state, since the balloon 21 is suspended by the wire rope 41 in the furnace, the wire rope 41 is wound or unwound by the winch 40, whereby the height position of the balloon 21 in the furnace is set to a desired position. Adjust to. Thereafter, the balloon 21 is inflated by supplying compressed air to the inside of the balloon 21 from the compressed air supply fan 30 through the compressed air duct 31 and the compressed air supply duct 22, and the tension generated by the supply of the compressed air is used. The balloon 21 is self-held in the furnace. Thus, since the balloon 21 is self-held at a desired height position, it is not necessary to hang it with the wire rope 41 after the self-holding, and the wire rope 41 can be loosened. During the self-holding of the balloon 21, the supply of compressed air to the balloon 21 is continued.

  Thus, according to this embodiment, the balloon 21 can be installed in the furnace without any operator entering the furnace. Then, an operator working in the furnace can enter the furnace from the lower manhole 15 shown in FIG.

When the operation in the furnace is finished and the balloon 21 is removed, the supply of the compressed air from the compressed air supply fan 30 to the balloon 21 is stopped, and the compressed air supply duct 22 and the compressed air duct 31 are disconnected, The balloon 21 is deflated in the furnace by removing the compressed air in the balloon 21. Thereafter, the wire rope 41 is wound or unwound by the winch 40, the deflated balloon 21 is moved to the vicinity of the upper manhole 14, the deflated balloon 21 is taken out from the upper manhole 14, and the tip of the wire rope 41 and the balloon 21 Remove the connection.
Thus, according to this embodiment, the balloon 21 can be taken out of the furnace without any operator entering the furnace.

  The balloon 21 shown in FIGS. 2 to 5 was installed in a furnace having a furnace diameter of 4180 mm, and a test was conducted to simulate a fallen object and receive a weight of 20 kg. As test conditions, the diameter of the outer shape of the balloon 21 at the time of inflation was set to 5000 mm, and the pressure of the compressed air supplied to the balloon 21 was 1.67 kPa, and this pressure of compressed air was continuously supplied. Thereby, the balloon 21 was self-held in the furnace without any problem.

In the test, a 20 kg weight was thrown from a 5 m drop and dropped onto the upper surface of the balloon 21 or the net 24 portion. As a result, the weight of 20 kg could be received without any problem on the upper surface portion of the balloon 21 and the net 24 portion.
That is, in this test, it was confirmed that the balloon 21 was in close contact with the inner wall of the furnace with an adhesive force sufficient to support the weight of a 20 kg weight falling from a head of 5 m in addition to its own weight (about 60 kg). .
The adhesion force can be adjusted by adjusting the pressure of compressed air supplied to the balloon and the area where the balloon is in contact with the furnace inner wall (thickness of the balloon).

DESCRIPTION OF SYMBOLS 10 Furnace 11 Straight body part 12 Furnace bottom part 13 Furnace deposits 14 Upper manhole 15 Lower manhole 20 Falling object protection device 21 Balloon 22 Compressed air supply duct 23 Through-hole 24 Net 25 LED light (illumination means)
26 Chuck 27 Eyelet 27A Outer Eyelet Row 27B First Inner Eyelet Row 27C Second Inner Eyelet Row 27D Third Inner Eyelet Row 28 Rope 30 Compressed Air Supply Fan 31 Compressed Air Duct 32 Connector 40 Winch 41 Wire Rope

Claims (9)

A falling object protective device installed in the furnace to receive the falling object,
An in-furnace falling object protection device having a balloon that expands by supplying compressed air therein and is self-held in the furnace by tension generated by the supply of the compressed air.   Each of the balloons has an outer eyelet row arranged on the upper surface and the lower surface so as to follow the outer shape when the balloon is inflated, and at least one arranged so as to follow the outer shape inside the outer eyelet row. The in-furnace fall object protection device according to claim 1, further comprising: an inner eyelet row, wherein the size of the outer shape when the balloon is inflated can be adjusted by tying up adjacent eyelet rows.   The in-furnace fallen object protection device according to claim 1 or 2, wherein the balloon has a shape in which a through hole is formed in a central portion when inflated, and a net is provided in the through hole.   The fallen object protection device according to any one of claims 1 to 3, wherein the material of the balloon is tarpaulin on the upper surface, a lightweight tarpaulin whose outer surface is thinner and lighter than the tarpaulin, and nylon fabric on the lower surface.   The in-furnace fallen object protection device according to any one of claims 1 to 4, wherein an illuminating means for illuminating the lower surface side is installed inside the balloon. A method for installing a fallen object protection device in a furnace in which the fallen object protection device in a furnace according to any one of claims 1 to 5 is installed in a furnace,
A method for installing a falling object protection apparatus in a furnace, wherein the balloon is expanded by supplying compressed air to the inside of the balloon in a furnace, and the balloon is self-held in the furnace by a tension generated by the supply of the compressed air.   Before inflating the balloon, the size of the outer shape when the balloon is inflated by tying up adjacent eyelet rows is in the range of 1.05 times to 1.25 times the size of the in-furnace shape. The installation method of the fallen object protective device in the furnace according to claim 6, wherein adjustment is performed so that   Before inflating the balloon, the balloon is suspended by a wire rope in the furnace, and the balloon is inflated after adjusting the height position of the balloon in the furnace by winding or lowering the wire rope. Item 8. The method for installing the falling object protective device in the furnace according to Item 6 or 7.   The tip of the wire rope in the furnace is taken out of the furnace through a working opening provided in the furnace, the tip of the wire rope and the balloon are connected, and the balloon is inserted into the furnace from the opening. In order to supply compressed air to the balloon, the front end of the compressed air supply duct connected to the balloon is left outside the furnace at the time of this charging. The installation method of the falling object protection apparatus in a furnace of Claim 8 which supplies compressed air from.

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