JP7085858B2 - Fallen object protection device in the furnace and its installation method - Google Patents

Description

The present invention relates to an in-core fallen object protection device installed to protect an operator from falling objects such as peeled refractory materials when working in a furnace such as a melting furnace or a combustion chamber, and an installation method thereof. ..

When working in a furnace, there is a concern that the refractory material and debris (clinker, dust lumps, etc.) that have deteriorated and peeled off from the upper part of the furnace will fall, and that the fallen objects such as these refractory materials will hit the operator. .. Therefore, in the past, in general, before entering the furnace, the operator visually checks for objects that are likely to fall, removes them using long objects or compressed air as necessary, and then enters the furnace. Then, I was working on building a temporary scaffolding as a cure for falling objects. However, with this conventional method, in addition to the time required to start the inspection and maintenance work inside the furnace, there was a slight concern about safety during the work of assembling the temporary scaffolding.

On the other hand, a technique of installing a balloon (airbag) in a furnace instead of assembling a temporary scaffold as a curing for falling objects is also known (for example, Patent Documents 1 and 2). However, all of these conventional balloons are inflated while being placed on the support member, and although the outer surface of the balloon is in close contact with the inner wall of the furnace when inflated, the close contact force (tension) is small. In this case, when a falling object that is heavier than the upper part of the furnace falls, the falling 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 between the outer surface of the balloon and the inner wall of the furnace is small, this adhesion is lost to the gravity of the falling object, and the falling object slides down between the outer surface of the balloon and the inner wall of the furnace. There is a risk of falling downward. Some of the falling objects such as refractory materials and deposits in the furnace that fall from the upper part of the furnace weigh more than 10 kg, and when such heavy objects fall, they cannot be received by the conventional balloon as described above and are below the balloon. There is a risk of falling.

Japanese Unexamined Patent Publication No. 5-113293 Japanese Unexamined Patent Publication No. 2014-136892

An object to be solved by the present invention is to provide a fallen object protection device in a furnace capable of reliably receiving a fallen object falling from the upper part of the furnace and an installation method thereof.

According to the present invention, the following methods (1) to (5) for installing the in-core fallen object protection device and (5) to (9) the in-core fallen object protection device are provided.
(1)
It is a fallen object protection device installed in the furnace to catch falling objects.
A fallen object protection device in a furnace having a balloon that expands by supplying compressed air to the inside and is self-held in the furnace by the tension generated by the supply of the compressed air.
(2)
The balloon has an outer eyelet row arranged to imitate the outer shape of the balloon on its upper surface and lower surface, respectively, and at least one arranged to imitate the outer shape inside the outer eyelet row. The in-core eyelet protection device according to (1), which is provided with an inner eyelet row and can adjust the size of the outer shell shape when the balloon is inflated by binding the adjacent eyelet rows.
(3)
The fallen object protection device in a furnace according to (1) or (2), wherein the balloon has a shape in which a through hole is formed in a central portion when the balloon is inflated, and a net is provided in the through hole.
(4)
The fallen object protection device in a furnace according to any one of (1) to (3), wherein the material of the balloon is a tarpaulin on the upper surface, a lightweight tarpaulin whose outer surface is thinner and lighter than the tarpaulin, and a nylon cloth on the lower surface.
(5)
The fallen object protection device in a furnace according to any one of (1) to (4), wherein a lighting means for illuminating the lower surface side is installed inside the balloon.
(6)
It is a method of installing the in-core fallen object protection device according to any one of (1) to (5), in which the in-core fallen object protection device is installed in the furnace.
A method of installing a fallen object protection device in a furnace, in which the inside of the balloon is expanded by supplying compressed air in the furnace, and the balloon is self-held in the furnace by the tension generated by the supply of the compressed air.
(7)
Before inflating the balloon, the size of the outer shape of the balloon at the time of inflating is in the range of 1.05 times or more and 1.25 times or less with respect to the size of the shape inside the furnace by constricting the adjacent eyelet rows. The method for installing the fallen object protection device in the furnace according to (6), which is adjusted so as to be.
(8)
Before inflating the balloon, the balloon is hung with a wire rope in the furnace, and the height position of the balloon in the furnace is adjusted by winding or unwinding the wire rope, and then the balloon is inflated. 6) Or the method for installing the fallen object protection device in the furnace according to (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 is connected to the balloon, and the balloon is inserted into the furnace from the opening. At the time of charging, the tip of the compressed air supply duct connected to the balloon to supply the compressed air to the balloon is left outside the furnace, and the tip side of the compressed air supply duct is left. The method for installing a fallen object protection device in a furnace according to (8), which supplies compressed air from the air.

According to the above-mentioned (1) in-furnace falling object protection device, the balloon adheres to the inner wall of the furnace with a strong adhesion enough to be self-held in the furnace, so that 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 falling object can be reliably received.

According to the above-mentioned (2) in-furnace falling object protection device, the size of the outer shell shape when the balloon is inflated can be adjusted to be an appropriate size with respect to the size of the in-furnace shape in which the balloon is installed. Therefore, it is possible to more reliably catch the falling object falling from the upper part of the furnace.
Naturally, the size of the outer shell shape when the balloon is inflated is larger than the size of the inner shape of the furnace in which this balloon is installed, but if it is too large, the outer outer shape will be distorted when the balloon is inflated in the furnace. As a result, there is a possibility that 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 above-mentioned (2) in-core fallen object protection device, the size of the outer shape of the balloon when the balloon is inflated can be reduced by tying the adjacent eyelet rows, so that the outer surface of the balloon can be reduced. And the inner wall of the furnace can be reliably brought into close contact with each other with strong adhesion. As a result, it is possible to more reliably catch the falling object falling from the upper part of the furnace.

According to the above-mentioned (3) in-furnace fallen object protection device, the work space below the balloon can be ventilated by an existing or temporary blower or the like through the through hole in the central portion. Further, since the net is provided in the through hole in the central portion, it is possible to prevent a falling object from falling downward from this through hole without impairing the ventilation property.
It should be noted that this through hole tends to collapse and shrink when the balloon is inflated as the size of the outer shell shape when the balloon is inflated becomes larger than the size of the inner shape of the furnace. If the size of the outer shell shape when the balloon is inflated can be reduced by tying it up, the size of the through hole can be sufficiently secured.

According to the above-mentioned (4) in-furnace falling object protection device, by properly using the material of the balloon, it is possible to reduce the weight while ensuring the strength required to reliably catch the falling object. That is, the upper surface that directly receives the falling object is made of tarpaulin, which is a high-strength material, and the outer surface is thinner and lighter than the tarpaulin used for the upper surface because it is in close contact with the inner wall of the furnace but does not directly receive the falling object. Since it is a tarpaulin and does not need to have high strength on the lower surface that does not directly receive the falling objects and does not come into close contact with the inner wall of the furnace, it is necessary to use a nylon cloth that is lighter than the lightweight tarpaulin to reliably catch the falling objects. It is possible to reduce the weight while ensuring the strength.
When the balloon has a through hole in the center as in (3) above, it is preferable that the material of the inner surface of the balloon is the same nylon cloth as the lower surface.

According to the above-mentioned (5) in-furnace falling object protection device, the work space below the balloon can be illuminated, which is particularly effective when the work space is dark. Further, since the lighting means is installed inside the balloon, it is possible to prevent the lighting means from being damaged in the furnace.
When the lighting 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 of the balloon is nylon cloth, the work space below can be illuminated without any problem while reducing the weight.

According to the method of installing the falling object protection device in the furnace of (6), the falling object adheres to the inner wall of the furnace with such a strong adhesion that the balloon is self-held in the furnace as in (1) above. It is possible to prevent the balloon from slipping down between the outer surface of the balloon and the inner wall of the furnace, and it is possible to reliably catch the falling object.

According to the method of installing the in-furnace fallen object protection device in (7), the size of the outer shell shape when the balloon is inflated is an appropriate size, specifically, the size of the in-furnace shape in which the balloon is installed. By adjusting the size of the inside of the furnace so that it is in the range of 1.05 times or more and 1.25 times or less, as described in (2) above, the fall falls from the upper part of the furnace. You can receive things more reliably.

According to the method of installing the falling object protection device in the furnace according to the above (8), the balloon can be installed at an arbitrary height position in the furnace, so that 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 of installing the fallen object protection device in the furnace according to the above (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 catch a falling object falling from the upper part of the furnace.

A vertical sectional view conceptually showing a state in which a falling object protection device in a furnace, which is an embodiment of the present invention, is installed in a furnace. The plan view of the falling object protection device in a furnace which is one Embodiment of this invention shown in FIG. The front view of the falling object protection device in a furnace shown in FIG. AA arrow view of FIG. The schematic perspective view of the falling object protection device in a furnace shown in FIG. It is explanatory drawing which shows the procedure of adjusting the size of the outer shell shape at the time of expansion of the balloon of the falling object protection device in a furnace shown in FIG. 2, (a) is before the size adjustment, (b) is the size adjustment. rear.

FIG. 1 conceptually shows a state in which a falling object protection device in a furnace, which is an embodiment of the present invention, is installed in a furnace by a vertical cross section.
The furnace 10 has a cylindrical straight body portion 11 and an inverted conical table-shaped furnace bottom portion 12, and the inner diameter (inner diameter inside the furnace) of the straight body portion 11 is about 3000 to 6500 mm. A refractory material is applied to the inner wall (inner wall of the furnace) of the furnace 10, and deposits 13 in the furnace such as clinker and dust lumps are attached to the inner wall of the furnace.
An in-core fallen object protection device 20, which is an embodiment of the present invention, is installed inside the furnace 10 (inside the furnace).

FIGS. 2 to 5 show the in-core fallen object protection device 20, FIG. 2 is a plan view, FIG. 3 is a front view, FIG. 4 is an arrow view of AA of FIG. 3, and FIG. 5 is a schematic perspective view. be. In FIG. 5, eyelets (eyelet rows) described later are omitted or simplified.
The in-furnace fallen object protection device 20 has a balloon 21 that inflates by supplying compressed air. Note that FIGS. 2 to 5 show a state in which the balloon 21 is inflated.

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 air is removed from the balloon 21 and the balloon 21 is contracted. 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. 1 is provided. By using one or a plurality of compressed air supply ducts 22 close to 14), the compressed air supplied from the compressed air supply fan 30 outside the furnace can be easily supplied to the balloon 21. The compressed air supply duct 22 that is not used when supplying the 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, and 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 not only as one but also as a plurality of nets 24. The 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.

An LED light 25 is installed inside the balloon 21 as a lighting means. In this embodiment, as shown in FIG. 4, eight LED lights 25 are installed on the outer surface inside the balloon 21 at equal intervals along the circumferential direction so as to illuminate the lower surface side of the balloon 21. Has been done. These eight LED lights 25 can be connected in series, for example, and then the chuck 26 on the inner surface of the balloon 21 can be opened and inserted into the balloon 21 through the opening thereof. The electric wire (not shown) that supplies electric power to each LED light 25 can be pulled out from the chuck 26 portion.

The balloon 21 is provided with an outer eyelet row 27A and three inner eyelet rows 27B to C, respectively, on the upper surface and the lower surface thereof.
A plurality of outer eyelet rows 27A are specifically along the outer shape (outermost outer shape) of the balloon 21 so as to follow the outer shape of the balloon 21 at the time of expansion (hereinafter, simply referred to as “outer shape of the balloon 21”). This is an array of eyelets 27.
The inner eyelet row 27B (hereinafter referred to as “first inner eyelet row 27B”) is an arrangement of a plurality of eyelets 27 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 an array of a plurality of eyelets 27 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 an array of a plurality of eyelets 27 so as to follow the outer shape of the balloon 21 inside the second inner eyelet row 27C.

In this way, each eyelet row 27A to D is an array of a plurality of eyelets 27 so as to imitate 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 D is D are arranged concentrically. Further, in this concentric arrangement, the diameters of the eyelet rows 27A to D 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 6800 mm, which is the same as the diameter of the outer shape of the balloon 21, the diameter of the first inner eyelet row 27B is 6000 mm, and 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 D on the upper surface of the balloon 21 and the diameters of the eyelet rows 27A to D on the lower surface of the balloon 21 are the same. In other words, the eyelet rows 27A to D on the upper surface of the balloon 21 and the eyelet rows 27A to D on the lower surface of the balloon 21 are arranged so as to overlap each other when viewed from the vertical direction.
Further, in each eyelet row 27A to D in this embodiment, 64 eyelets 27 are arranged at equal intervals (about 5.6 ° intervals).

As described above, 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 of the balloon 21 at the time of expansion can be adjusted in four stages. be.
That is, when the eyelet rows 27A to D are not enclosed at all, the diameter is the largest as shown in FIGS. 2 and 6 (a) (the diameter at this time is 6800 mm as described above).
Next, as shown in FIG. 6B, by confining the outer eyelet row 27A and the first inner eyelet row 27B, the size (diameter) of the outer shell shape of the balloon 21 when inflated is first. The diameter of the inner eyelet row 27B (6000 mm) is reduced.
Further, if the outer eyelet row 27A, the first inner eyelet row 27B, and the second inner eyelet row 27C are combined, the size (diameter) of the outer shell shape of the balloon 21 when inflated is that of the second inner eyelet row 27C. It is reduced to the diameter (5000 mm). Further, 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 of the balloon 21 at the time of expansion can be obtained. It is reduced to the diameter (4000 mm) of the third inner eyelet row 27D.
As described above, the balloon 21 of this embodiment changes the size (diameter) of the outer shape at the time of expansion into four stages of 6800 mm, 6000 mm, 5000 mm, and 4000 mm by changing the combination that encloses the adjacent eyelet rows 27A to D. It is possible. The thickness (height) of the balloon 21 when inflated is 1000 mm.

Here, when enclosing the adjacent eyelet rows 27A to D, for example, as shown in an enlarged manner in FIG. 6B, the eyelet 27 of the outer eyelet row 27A and the first inner eyelet row 27B adjacent thereto are used. The eyelet 27 and the eyelet 27 may be tied together with the rope 28. However, the method of binding adjacent eyelet rows is not limited to this, and may be bound by a plurality of pairs of eyelets instead of binding by a pair of eyelets as shown in FIG. 6B, for example. Further, in this embodiment, the outer eyelet row is sequentially bundled to the inner eyelet row, but the order in which the 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 at the time of expansion can be changed in four stages of 6800 mm, 6000 mm, 5000 mm and 4000 mm. After repeated tests of installing in a furnace with a diameter of 4180 mm inside the furnace while changing the diameter of the shape, it is preferable to set the diameter of the outer shape of the balloon when the balloon is inflated to the range of "diameter inside the furnace + 300 to 1000 mm". I understood. When this is converted as a ratio of sizes, the size of the outer shell shape when the balloon is inflated is 4480/4180 ≈ 1.05 times or more and 5180/4180 ≈ 1.25 times or less the size of the in-furnace shape. It can be said that it is preferable to set it in the range of.
That is, if the size of the outer shell shape when the balloon is inflated is too small with respect to the size of the inner shape of the furnace, it becomes difficult to realize the above-mentioned "self-holding". On the other hand, if the size of the outer shell shape when the balloon is inflated is too large for the size of the inner shape of the furnace, as described above, when the balloon is inflated in the furnace, the outer shape becomes distorted and the balloon becomes There is a risk that a gap may be created between the outer side surface and the inner wall of the furnace, or a part with weak adhesion may be created.

In this embodiment, three inner eyelet rows are provided, but in the present invention, at least one inner eyelet row is sufficient. That is, if there is one inner eyelet row, the size (diameter) of the outer shape of the balloon 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, instead of completely binding the inner eyelet row and the outer eyelet row, the inner eyelet row and the outer eyelet row may be bound with a predetermined gap, and the predetermined spacing may be adjusted. The size (diameter) of the outer shape of the balloon when inflated can be adjusted in more stages. However, it takes time to tie the inner eyelet row and the outer eyelet row with a predetermined interval, so the size (diameter) of the outer shape when the balloon is inflated can be adjusted in many stages with a simple operation. It is preferable to provide a plurality of inner eyelet rows in order to be adjustable.

Further, in this embodiment, the outer shape of the balloon 21 is made into a circle according to the shape inside the furnace, but if the shape inside the furnace is different, it can be appropriately changed according to this, for example, an ellipse or a quadrangle. In this case, the outer eyelet row and the inner eyelet row are also made into ellipses or quadrangles 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 a tarpaulin, the outer surface is a lightweight tarpaulin, and the lower surface and the inner surface are nylon cloth. The details of each material are as shown in Table 1. The tarpaulin (lightweight tarpaulin) is a composite sheet in which a fiber cloth is sandwiched between soft synthetic resin films, and Table 1 shows its 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 required to reliably catch the falling object. That is, the upper surface that directly receives the falling object is made of tarpaulin, which is a high-strength material, and the outer surface is thinner and lighter than the tarpaulin used for the upper surface because it is in close contact with the inner wall of the furnace but does not directly receive the falling object. Since it is a tarpaulin and does not need to have high strength on the lower surface and inner side surface that do not directly receive falling objects or come into close contact with the inner wall of the furnace, a nylon cloth that is lighter than a lightweight tarpaulin is used to reliably catch falling objects. It is possible to reduce the weight while ensuring the strength required for. To show a specific example of weight reduction, the weight of a balloon whose entire surface was formed of tarpaulin in Table 1 exceeded 100 kg, but by using different materials as described above, the weight was reduced to about 60 kg, 40. Weight reduction of% or more is planned.

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

In this embodiment, the balloon 21 is charged into the furnace from the upper manhole 14 shown in FIG. 1, but in a state where the balloon 21 is contracted before charging, the outer diameter of the balloon 21 at the time of expansion is the diameter inside the furnace. Adjust so that it is within an appropriate range (“inner diameter + 300 to 1000 mm”). The diameter of the outer shape of the balloon 21 at the time of expansion is adjusted by changing the combination of the adjacent eyelet rows 27A to D as described above. As an example, when the diameter inside the furnace is 4180 mm, the appropriate range of the diameter of the outer shell shape when the balloon 21 is inflated is 4480 to 5180 mm, so that the outer eyelet row 27A, the first inner eyelet row 27B, and the second inner eyelet row By binding the row 27C, the diameter of the outer shape of the balloon 21 when inflated is set to 5000 mm.

On the other hand, as shown in FIG. 1, a winch 40 is installed at the top of the furnace 10 in order to adjust the height position of the balloon 21 in the furnace, and a wire rope 41 is placed in the furnace from the winch 40. It is hanging. 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 connecting tool or the like (not shown). do. After that, 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 tip of the compressed air supply duct 22 and the compression extending from the compressed air supply fan 30 are left. The tip of the air duct 31 is connected by a connecting tool 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. After that, the balloon 21 is expanded by supplying compressed air from the compressed air supply fan 30 to the inside of the balloon 21 via the compressed air duct 31 and the compressed air supply duct 22, and the tension generated by the supply of the compressed air causes the balloon 21 to expand. The balloon 21 is self-held in the furnace. Since the balloon 21 is self-held at a desired height position in this way, it is not necessary to suspend 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.

As described above, according to this embodiment, the balloon 21 can be installed in the furnace without any operator entering the furnace. After installing the balloon 21, a worker working in the furnace can enter the furnace from, for example, the lower manhole 15 shown in FIG. 1 to perform the work.

When the work in the furnace is completed and the balloon 21 is removed, the supply of compressed air from the compressed air supply fan 30 to the balloon 21 is stopped, and the connection between the compressed air supply duct 22 and the compressed air duct 31 is disconnected. By removing the compressed air in the balloon 21, the balloon 21 is contracted in the furnace. After that, the wire rope 41 is wound or unwound by the winch 40, the contracted balloon 21 is moved to the vicinity of the upper manhole 14, the contracted balloon 21 is taken out from the upper manhole 14, and the tip of the wire rope 41 and the balloon 21 are combined. Disconnect.
As described above, according to this embodiment, the balloon 21 can be taken out of the furnace without the operator entering the furnace at all.

The balloons 21 shown in FIGS. 2 to 5 were installed in a furnace having a diameter of 4180 mm, and a test was conducted in which a weight of 20 kg was received by simulating a falling object. As a test condition, the diameter of the outer shape of the balloon 21 at the time of expansion was set to 5000 mm, and the pressure of the compressed air supplied to the balloon 21 was 1.67 kPa, and the compressed air at this pressure was continuously supplied. As a result, the balloon 21 was self-held in the furnace without any problem.

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

10 Furnace 11 Straight body 12 Furnace bottom 13 Deposits in the furnace 14 Upper manhole 15 Lower manhole 20 Fallen object protection device in the furnace 21 Balloon 22 Compressed air supply duct 23 Through hole 24 Net 25 LED light (lighting 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 (7)

It is a fallen object protection device installed in the furnace to catch falling objects.
It has a balloon that expands by supplying compressed air inside and is self-held in the furnace by the tension generated by the supply of this compressed air.
The balloon has an outer eyelet row arranged to imitate the outer shape of the balloon on its upper surface and lower surface, respectively, and at least one arranged to imitate the outer shape inside the outer eyelet row. An in-core eyelet protection device that has an inner eyelet row and can adjust the size of the outer shell shape when the balloon is inflated by binding the adjacent eyelet rows . It is a fallen object protection device installed in the furnace to catch falling objects.
It has a balloon that expands by supplying compressed air inside and is self-held in the furnace by the tension generated by the supply of this compressed air.
The material of the balloon is a lightweight tarpaulin whose upper surface is tarpaulin, whose outer surface is thinner and lighter than the tarpaulin, and whose lower surface is nylon cloth . It is a fallen object protection device installed in the furnace to catch falling objects.
It has a balloon that expands by supplying compressed air inside and is self-held in the furnace by the tension generated by the supply of this compressed air.
A fallen object protection device in a furnace in which a lighting means for illuminating the lower surface side is installed inside the balloon . The fallen object protection device in a furnace according to any one of claims 1 to 3, wherein the balloon has a shape in which a through hole is formed in a central portion when the balloon is inflated, and a net is provided in the through hole. A method for installing an in-core fallen object protection device according to any one of claims 1 to 4, wherein the in-core fallen object protection device is installed in the furnace.
Including a step of expanding by supplying compressed air to the inside of the balloon in the furnace and self-holding the balloon in the furnace by the tension generated by the supply of the compressed air.
The balloon has an outer eyelet row arranged to imitate the outer shape of the balloon on its upper surface and lower surface, respectively, and at least one arranged to imitate the outer shape inside the outer eyelet row. It is equipped with an inner eyelet row, and the size of the outer shell shape when the balloon is inflated can be adjusted by binding the adjacent eyelet rows.
Before inflating the balloon, the size of the outer shell shape of the balloon at the time of expansion is 1.05 times or more and 1.25 times or less with respect to the size of the inside shape of the balloon by constricting the adjacent eyelet rows. How to install a fallen object protection device in the furnace, which is adjusted to be within the range . Before inflating the balloon, the balloon is hung with a wire rope in the furnace, the height position of the balloon in the furnace is adjusted by winding or unwinding the wire rope, and then the balloon is inflated. Item 5. The method for installing the fallen object protection device in the furnace according to Item 5. 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 is connected to the balloon, and the balloon is inserted into the furnace from the opening. At the time of charging, the tip of the compressed air supply duct connected to the balloon to supply the compressed air to the balloon is left outside the furnace, and the tip side of the compressed air supply duct is left. The method for installing a fallen object protection device in a furnace according to claim 6 , wherein compressed air is supplied from the air.

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