JPH08301620A - Protective member and protective device for container for melting glass - Google Patents

Abstract

PURPOSE: To provide the subject protective device made up of specific side support members and specific fixing member to enable a platinum vessel to be placed, disassembled or repaired in an oven without heightening oven height and requiring powder use when the vessel for melting glass is to be protected. CONSTITUTION: A cylinder along the contour of a vessel for melting glass is longitudinally divided, cutouts 2A, 4A to avoid a glass discharge nozzle connected to the vessel are formed respectively at the lower ends of the resultant half-cylinders, and the periphery of the opening of the vessel is provided with a member for reinforcing the opening. The upper ends of the respective support members 2, 4 for the respective half-cylinders are provided with level differences 2B, 4B which are engaged with a fixing ring member 6. The platinum vessel is put into the oven through an openable left side door and placed at the center of a recess 1a. The side support members 2, 4 are also put into the oven along the same direction and allowed to fall into the recess 1a so as to sandwich the vessel nearly rectangularly to its side. At this time, a discharge pipe is drawn out via the cutouts 2A, 4A and engaged with the fixing ring 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective device for protecting a glass melting vessel made of platinum or the like for melting glass.

[0002]

2. Description of the Related Art In recent years, crucibles and devices made of precious metals such as platinum have been generally used for melting high quality optical glass. The platinum container (hereinafter, including the crucible)
Compared to conventional clay crucibles, it is less likely to be eroded by glass, so striae and bubbles are less likely to occur, and a large improvement in yield can be expected. In addition, the degree of freedom of the shape of the device is greater than that of clay, and it has the advantage that complicated shapes can be realized. For example, you can freely connect multiple tanks with a connecting pipe, or install a glass outflow pipe at any position.
There is no need to worry that molten glass will exude at the connection. Further, there is an advantage that workability is good because it is not cracked by thermal shock unlike clay, even when the temperature changes rapidly.

However, precious metals such as platinum are very expensive materials, and in order to reduce the initial investment amount of equipment, a method of making the thickness of the platinum container as thin as possible has been adopted. The disadvantage that the strength of the container is lowered has occurred. Therefore, in order to prevent the deformation due to the decrease in strength, a method of protecting the periphery of the platinum container with a refractory has been used. In this case, the shape of the protective refractory is generally similar to that of the platinum container. Also, if the target platinum container has a simple shape, the protective refractory may be made of one piece, but if the platinum container has a complicated shape as described above, a protective refractory for each platinum tank should be used. In addition to the preparation, each refractory was made by dividing it into a bottom plate and side plates. Then, in order to prevent the platinum container from moving or deforming in the protective refractory material, alumina (Al ₂ O ₃ ) powder or zirconia (Z
rO ₂ ) powder has generally been filled.

[0004]

However, the method of protecting a platinum container as seen in the above-mentioned conventional example has the following problems.

Conventionally, when using a protective refractory, the platinum container is usually placed outside the furnace, the platinum container is placed in the refractory, the gap is filled with the above-mentioned powder, and then the refractory is placed inside the furnace. When installing it in the furnace, it is necessary to pay close attention so that the protective refractory and the platinum container do not slip and the powder does not spill, and it is extremely difficult for the expert to completely eliminate the failure. .

As a countermeasure against this, it is conceivable to perform the above-mentioned work in the furnace from the beginning. For example, there is a method in which a bottom plate of a refractory material for protection is installed in a furnace in advance, a platinum container is placed on the bottom plate, and then a side plate is covered from above. Also,
If the protective refractory is a unitary structure in which the bottom plate and the side plate are attached, the protective refractory is installed in the furnace in advance and the platinum container is placed therein. However, in both cases, the height inside the furnace is required to be the height of the platinum container and the height of the refractory material for protection, which is disadvantageous in that the furnace body becomes high.

Next, there was a problem associated with handling the above powder. First of all, dust countermeasure equipment was required, and installation of a dust collector was unavoidable, causing a cost increase. Further, there are cases where powder spills from the opening provided in the protective refractory, for example, the glass outflow pipe take-out portion, and the inside and outside of the furnace are contaminated. Further, it is almost impossible to dismantle and repair the platinum device installed in the furnace as it is because of the difficulty in processing the powder.

1. A first object of the present invention is to protect a platinum container for melting glass, which can be attached and detached in the furnace without increasing the height of the furnace body, and can be used as a refractory metal in the furnace. An object of the present invention is to provide a device for protecting a platinum container that enables installation, dismantling and repair of an object.

2. A second object of the present invention is to provide an apparatus for protecting a platinum container that does not use powder when protecting a platinum container for melting glass.

3. A third object of the present invention is to provide a heat resistant device for protecting a platinum container, which can cope with a platinum container having an inclined bottom surface when protecting the platinum container for melting glass.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to press a refractory for protecting a platinum container for melting glass on a stand of the platinum container, a side support member of the platinum container, and an upper portion of the side support member. And the side supporting member is composed of a plurality of vertically divided members, so that the side supporting member can be attached and detached from a direction substantially perpendicular to the side surface of the platinum container.

A further object of the present invention is that the side surface supporting member of the platinum container constituting the refractory for protecting the platinum container has a portion that comes into surface contact with the outer surface of the platinum container. This is achieved by preventing deformation of the container.

Further, the object of the present invention is achieved by providing a surface of the platinum container constituting the refractory for protecting the platinum container with an inclination corresponding to the inclination of the bottom surface of the platinum container, so that the bottom surface and the mounting table are in surface contact with each other. It

[0014]

A refractory for protecting a platinum container for melting glass is composed of a platinum container stand, a side surface supporting member of the platinum container, and a member for pressing an upper portion of the side surface supporting member. The support member is composed of a plurality of vertically divided members,
The side support member can be attached and detached from a direction substantially perpendicular to the side surface of the platinum container.

[0015]

【Example】

(Embodiment 1) Hereinafter, an embodiment of the present invention will be specifically described with reference to the drawings. FIG. 1 is a perspective view of a refractory material for protecting a melting vessel such as platinum for melting glass used in the first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a state where this refractory material is actually installed in a glass melting furnace together with a platinum container. 1 is a platinum container stand, 2 and 4 are side support members, 6
Is a ring-shaped fixing member that presses 2 and 4 from above. 2 and 4 are glass melting vessels 1 as shown in FIG.
When the glass melting container has a cylindrical shape, the cylindrical body along the outer peripheral surface of the cylindrical shape is divided in the longitudinal direction, and the lower end portion of the semi-cylindrical body is formed. A glass outflow nozzle 10 connected to a glass melting vessel
Notches 2A and 4A for avoiding A are formed. Around the opening of the glass melting container 10, the container is also formed with an outward flange portion 10b for reinforcing the strength (see FIG. 2). Stepped portions 2A and 4B are formed at the upper ends of the protection members 2 and 4 of the semi-cylindrical body, and the fixing ring member 6 is fitted in the stepped portions.

FIG. 3 is a sectional view of the essential parts of the glass melting apparatus. Reference numeral 12 denotes a heat resistant structure, which is composed of a bottom member 12A, a side member 12B, a ceiling member 12C, a door member 12D, and the like, and is made of a refractory brick or a heat resistant material. As shown in FIG. 3, the bottom member 12A is formed with a notch 12a for inserting the glass outflow nozzle 10A connected to the glass melting container.

Reference numeral 14 shows a part of a heater for heating.

The platinum container 9 has a size of 300 mm around the circumference of the platinum container body 9 and the width of the folded collar 13 is 5 mm, so that the outer diameter of the collar is 310 mm.
mm, the height of the main body 9 is 320 mm, the diameter of the outflow pipe 10 is 7 mm, and the thickness of the platinum container main body 9 is 0.5 mm.

Next, the protective refractory material will be described.

First, the mounting table 1 has: a recess 1A on the upper surface; horizontal corresponding to the bottom surface of the platinum container; inner diameter has a slight margin when installed with the side supporting members 2 and 4 facing each other. To have.

The side surface supporting members 2 and 4 are: vertical structure; height 300 mm; inner surface dimensions 2 and 3 face each other so that they come into surface contact with the side surface of the platinum container 9. (Inner diameter 300 mm) ・ Steps 2B and 4B for fitting the pressing ring 6 on the upper part
There are notches 2A and 4A through which the outflow pipe 10A passes.

The upper presser ring 6 has a height of 25 mm, and an inner diameter that fits in the step 7 with some allowance. Also, the outer diameter of the collar 10a of the platinum container folded back is 310 mm.
Made larger.

Although the refractory material is made of alumina at 95% or more, a material that does not have any adverse chemical effect on the platinum container can be appropriately selected as long as the coefficient of thermal expansion is not significantly different from that of the platinum container. . Here, a method of installing a platinum container in the furnace using the protective refractory material of the present invention will be described step by step. First, the stand 1 is installed at the position in the furnace shown in FIG.

Next, the platinum container is opened and closed by a door 1 on the left side of the drawing.
Open 2D, insert into the furnace from the left side of the drawing, and install in the center of the recess 1a. Next, the side surface support members 2 and 4 are also inserted into the furnace from the same direction and are dropped into the recess 1a so as to be sandwiched from the direction substantially perpendicular to the side surface of the platinum container 10. This time,
The outflow pipe 10 is taken out through the notches 2A and 4A. Since the platinum container is attached from the side of the platinum containers 2 and 4, it does not matter if the collar 10a is folded back. After that, the upper pressing ring 6 is fitted into the steps 2B and 4B from above the platinum container.

According to this installation method, the height A of the space in the upper part of the furnace is set so that the upper pressing ring 4 can be put in and taken out.
It would be good if the height of 25 mm or more could be secured.
Actually, if a slight allowance is provided to prevent the upper pressing ring 4 from being rubbed against the ceiling in the furnace or the platinum device when the upper holding ring 4 is taken in and out, it is possible to prevent foreign matter from falling into the platinum device. In this embodiment, it is set to 60 mm.

Next, regarding the procedure for dismantling and repairing the platinum container and the refractory material for protection, basically the procedure may be performed in the completely reverse order of the above-mentioned installation. Therefore, since the protective refractory can be attached and detached in the furnace, it is not always necessary to take out the entire platinum device with the refractory attached to the outside of the furnace, and only the minimum necessary portion for dismantling or repairing should be taken out. In addition, since no powder is used for the installation, disassembly and repair, no dust countermeasure is required and the work in the furnace is very easy.

Here, using the installed apparatus, for example, the optical glass of the heaviest category having a specific gravity at room temperature of more than 5 (LaSF13 (specific gravity: 5.10) manufactured by Schott) and La
SF31 (same as 5.24) etc. 1100 to 1400 ° C
I tried melting it. In the experiment, about 80% of the volume of the platinum container was put and held at the melting temperature for 1 week, then the glass was flown out, the temperature of the furnace was lowered, and the deformation of the side of the platinum container was investigated. No deformation was observed.

On the other hand, according to the conventional method, the protective refractory was actually installed in a glass melting furnace together with a platinum container, and an attempt was made to dismantle it. The contents of the comparative experiment will be described with reference to FIG. The platinum container 9 used in the comparative experiment is the same as that in the example. The refractory material for protection is composed of two points, a mounting table 16 and a ring-shaped side surface supporting member 17. The side surface support member 17 has an inner diameter of 320 mm, and an alumina powder 18 is filled in a gap of 10 mm from the platinum container body 9.
There is a recess 19 on the upper surface of the table 16, and the inner diameter of the recess is 355 m.
m.

Several methods have been identified for installing the protective refractory and the platinum container in the furnace.

In the first installation method, the platinum container was fitted with a refractory material outside the furnace, the gap was filled with alumina powder, and then the installation was carried out in the furnace. At this time, I tried to insert the platinum container together with the refractory into the furnace, but the weight of the outflow pipe caused the platinum container to shift, and it was finally possible to install it for the third time. A dust collector was required when filling the alumina powder, or the powder was scattered around and in the atmosphere.

The next installation was carried out in the furnace. That is, table 1
6 is installed and the platinum container 9 is installed in the recess 19, but the upper space B in the furnace is required to be 300 mm or more for mounting the side support ring 17 (more than the height of the side support ring 17). ). Further, when the alumina powder was tried to be filled in the furnace, it was spilled into the furnace by any means, and the filled powder could not be solidified due to an appropriate amount, so that the filling could not be performed sufficiently.

Next, for dismantling and repair after installation in the furnace (work assuming it), when trying to do it in the furnace, it is difficult to clean up the alumina powder, and when the side support ring is to be removed in the furnace. The upper space B in the furnace needs to be 300 mm or more, and the furnace body 21 becomes high. Therefore, it was inconvenient because the platinum container and refractory had to be taken out of the furnace all together.

To summarize the above, when protecting the platinum container for melting the glass, a refractory for protecting the platinum container is used.
A platinum container stand, a side surface supporting member of the platinum container, and a member for pressing the upper portion of the side surface supporting member, and further, by constituting the side surface supporting member by a plurality of vertically divided members, As a result of enabling desorption from the direction almost perpendicular to the side of the platinum container, it is possible to desorb in the furnace without increasing the height of the furnace body, and also to install and dismantle the platinum container and refractory in the furnace. A refractory for protecting a platinum container for enabling repair can be provided.

Further, the side surface supporting member is provided with a portion that comes into surface contact with the outer surface of the platinum container so that the protection refractory can prevent the platinum container from being deformed. A refractory for device protection can be provided.

(Embodiment 2) FIG. 4 is a perspective view of a protective refractory for a platinum container used in the second embodiment of the present invention.
Shows in a vertical cross-sectional view a state in which this refractory material is actually installed in a glass melting furnace together with a platinum device. 22 is the bottom of the glass melting furnace and is made of refractory bricks or heat insulating material.

In the second embodiment, the platinum container and the refractory are roughly divided into three parts. The structure of the platinum container is as shown in FIG. 5, a rectangular portion 23 on the left side, a connection pipe 24 (taper-cylindrical shape) on the right side, and a cylindrical portion 2 on the rightmost side.
5, the glass outflow pipe 26 vertically downward in the center of the bottom
There is. In addition, folding collars 27, 28 for reinforcement are provided all around the upper end of the opening of the platinum container. A refractory material is formed corresponding to each part of the platinum container. The refractory material of FIG. 4A is provided for the square portion of the platinum container, the refractory material B for the taper-like connecting pipe, and the cylindrical portion. There is refractory C for the outflow pipe. FIG. 6 shows a perspective view of the furnace bottom member 22.

The size of the platinum container is 200 × 300 mm on the outer periphery of the side surface of the rectangular portion 23, and the height is 60 mm on the leftmost side and 80 m on the right side in FIG.
m Bottom slope is about 3.8 ° The outer diameter of both ends of the connecting pipe 24 is 15 mm and 30 mm,
The length is 350 mm, the outer diameter of the cylindrical portion 25 is 120 mm, the height is 120 mm, and the diameter of the outflow pipe 26 is 10 mm.

The thickness of the square portion and the cylindrical portion was 0.4 mm, and the width of the folded collars 27 and 28 was 4 mm.

The refractory will be described in detail with reference to FIG.
Basically, the parts configuration is the same as that of the first embodiment. First, with respect to A, the platinum container table 29 has: A recess 30 on the upper surface; An inclination (3.8 °) corresponding to the inclination of the bottom surface of the platinum container is provided so as to make surface contact with platinum.

The inner frame is designed to have a slight margin when the side support members 32 and 33 are installed so as to face each other.

A notch 31 for avoiding the connecting pipe
There is.

The side surface supporting members 32 and 33 are: vertical structure; height: 85 mm (difference between the highest part and the lowest part); the inner surface dimension is the platinum container 23 with the two members facing each other.
So that it comes into surface contact with the side surface of. (200 × 300m
m) -Inclination 34 matched to the recess at the bottom, -Step 35 for fitting the holding frame at the top, -Notch 36 for passing the connecting pipe.

The upper pressing frame 37 has a height of 15 mm. The inner surface 38 is dimensioned to fit in the step 35 with a slight margin.

Next, as for B, the connection pipe 2 of the platinum container
It is a table that supports the lower half of 4.

There is a recess 40 on the upper surface, and surface contact is made by adjusting the outer diameter and inclination of the lower half of the connecting pipe.

Next, regarding C, the same as in A, the mounting table 41 has: a recess 42 on its upper surface;

The inner diameter has a slight margin when the side support members 44 and 45 are installed in a state of facing each other.

A notch 43 for avoiding the outflow pipe
There is.

The side surface support members 44 and 45 are: vertical structure; height: 115 mm (difference between the highest part and the lowest part); the inner surface dimension is the platinum container 25 with the two members facing each other.
So that it comes into surface contact with the side surface of. (Inner diameter 120 mm) -There is a step 46 on the top to fit the holding frame, and-A notch 47 for the connection pipe to pass through.

The upper presser ring 48 has a height of 15 mm.
Also, the outer diameter of the collar of the platinum container folded back was made larger than 130 mm.

Further, the refractory material is the same as that of the first embodiment, but a material that does not have any adverse chemical effect on the platinum container can be appropriately selected as long as the coefficient of thermal expansion is not significantly different from that of the platinum container.

Here, the method for installing the platinum container in the furnace using the protective refractory material of the present invention is described in Example 1.
Is the same as That is, the placing table, the platinum container, the side surface supporting member, and the upper holding member may be installed in this order in the furnace. In addition,
The orientation of the notch 43 to avoid the outflow pipe 26 is shown in FIG.
As shown in, the platinum container is inserted into the furnace facing the front side of the drawing as in the case of the front side of the drawing. Also, no powder is used at the time of installation.

According to this installation method, the height of the space in the upper part of the furnace should be at least 15 mm so that the upper pressing members 37 and 48 can be taken in and out, but in this embodiment, it is set to 25 mm. .

Next, regarding the procedure for dismantling and repairing the platinum container and the refractory material for protection, similar to the first embodiment, basically the procedure may be completely opposite to the above-mentioned installation.

Here, using the installed apparatus, Example 1
A glass melting experiment was carried out for one week in the same manner as in 1. but no problematic deformation was found in the platinum container including the inclination.

On the other hand, in the case where the recess 30 is not inclined, unless the square portion of the platinum container is supported by any method, it falls by its own weight even at room temperature, and the vicinity 49 of the base of the connecting pipe is crushed.

Next, according to a conventional method, the protective refractory was actually installed in a glass melting furnace together with a platinum container, and an attempt was made to dismantle it. The content of the comparative experiment is not shown in the figure. What was changed in the comparative experiment was that the side support members “32, 3
3 "and" 44, 45 "are not vertical splits but are integrated, and that the upper holding members 37, 48 are not used,
The point is that a gap (8 mm) is provided between the platinum container and the side surface support member and the alumina powder is filled.

First, a problem similar to that of the conventional method of the first embodiment occurred with the installation. That is, although the refractory was mounted on the platinum container outside the furnace and the alumina powder was filled in the gap, a dust collector was required, and the platinum container was likely to be displaced when installed inside the furnace, so it had to be re-installed several times. did not become. Especially when the platinum container was composed of multiple tanks like this time, it was extremely difficult to move the platinum container while the refractory was still attached.

Next, for dismantling and repair after installation in the furnace (assumed to be the work), when trying to perform in the furnace, it is difficult to clean up the alumina powder, and side support members (height 80 mm) are set in the furnace.
And 115 mm), the upper space in the furnace needs to be 115 mm or more, and the furnace body becomes high. Therefore, it was inconvenient because the platinum container and refractory had to be taken out of the furnace all together.

In summary, when protecting a platinum container for melting glass, a refractory for protecting the platinum container is used.
A platinum container stand, a side surface supporting member of the platinum container, and a member for pressing the upper portion of the side surface supporting member, and further, by constituting the side surface supporting member by a plurality of vertically divided members, As a result of enabling desorption from the direction almost perpendicular to the side of the platinum container, it is possible to desorb in the furnace without increasing the height of the furnace body, and also to install and dismantle the platinum container and refractory in the furnace. A refractory for protecting a platinum container for enabling repair can be provided.

In addition, the side supporting member has a portion that comes into surface contact with the outer surface of the platinum device so that the protective refractory can prevent the platinum container from being deformed. A refractory for container protection can be provided.

Further, by providing an inclination corresponding to the inclination of the bottom surface of the platinum container on the mounting table so that the bottom surface and the mounting table are in surface contact with each other, a refractory for protecting a platinum container capable of supporting a platinum device having a slanted bottom surface is provided. Can be provided.

(Example 3) In Example 3, although not shown in the figure, one platinum thermocouple for temperature measurement was welded to the side surface of the platinum apparatus of Example 1. Then, a relief was formed on the inner surface of the side surface supporting member of the protective refractory to avoid the thermocouple. The relief portion does not make surface contact with the platinum device, but otherwise makes surface contact as in Example 1, so the effect obtained in Example 1 was not changed. That is, even if the height of the furnace body is not increased, the refractory material for protecting the platinum device can be attached and detached in the furnace, and further, the installation, disassembly and repair can be performed in the furnace, and the protection refractory material can be used for the platinum device. Since it is possible to prevent deformation, it is possible to provide a refractory for protecting a platinum device that does not use powder.

[0065]

The present invention has the following effects from the above invention.

1. When protecting the platinum container for melting the glass, a platinum container protection refractory, a platinum container stand, composed of a side support member of the platinum container, and a member for pressing the upper portion of the side support member, further , By constituting the side surface support member by a plurality of vertically divided members, as a result of enabling the desorption of the side surface support member from a direction substantially perpendicular to the side surface of the platinum container, without increasing the height of the furnace body, It is possible to provide a refractory for protecting a platinum container that can be installed and removed in the furnace and that enables installation, disassembly, and repair of the platinum container and the refractory in the furnace.

2. When protecting the platinum container for melting glass, the side surface supporting member of the platinum container that constitutes the refractory for protecting the platinum container has a portion that makes surface contact with the outer surface of the platinum container, and protects the refractory fire. As a result of preventing the platinum container from being deformed by the object, it is possible to provide a refractory for protecting the platinum container that does not use powder.

3. When protecting the platinum container for melting the glass, provide a slope corresponding to the slope of the bottom surface of the platinum container on the mount of the platinum container that constitutes the refractory for protecting the platinum container so that the bottom and the mount come into surface contact. As a result, it is possible to provide a refractory for protecting a platinum container, which can be used for a platinum container having a slanted bottom surface.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a protective refractory used in Example 1.

FIG. 2 is an explanatory diagram of Example 1.

FIG. 3 is a perspective view of a bottom member according to the first embodiment.

FIG. 4 is an explanatory diagram of the second embodiment.

FIG. 5 is a cross-sectional view of the main parts of the device of Example 2

FIG. 6 is a perspective view of a bottom member of the second embodiment.

FIG. 7 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 1 Stand 2 Side Supporting Member 4 Side Supporting Member 6 Upper Pressing Ring 26 Outflow Pipe 27 Folding Collar 28 Folding Collar 29 Stand 33 Recess 31 Notch to Avoid Connection Pipe 32 Side Supporting Member 33 Side Supporting Member 34 Lower Side Supporting Member Inclination provided at 35 Step 36 Notch to avoid connecting pipe 37 Upper presser frame 38 Inner surface of 37 39 Stand 40 Recess 41 Stand 42 Recess 43 Notch to avoid outflow pipe 44 Side support member 45 Side support member 46 Step 47 Connect the connection pipe Cutouts to avoid 48 Upper presser ring 49 Near the base of the connecting pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Isamu Isamu, Tokyo 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (5)

[Claims] 1. A protective member for protecting a container for melting glass, the protective member comprising a plurality of side surface supporting members along the outer peripheral shape of the container and a fixing member for fixing the plurality of side surface supporting members. A glass-melting container protection member comprising: 2. The container protecting member for melting glass according to claim 1, wherein an engaging portion for engaging with the fixing member is formed at an upper end portion of each side surface supporting member of the melting container. 3. A protective device for protecting a glass melting container provided with an outflow nozzle for outflowing glass, comprising: a plurality of protective members along the outer peripheral shape of the container; and the protective member on the outer peripheral surface of the container. A protective device for protecting a glass melting container, comprising a fixing member for fixing, and a cutout portion for avoiding the outflow nozzle is formed in the protective member. 4. A protective device for protecting a glass melting container having an outflow nozzle for outflowing glass, the heat-resistant structural member having an opening for inserting the outflow nozzle to accommodate the glass melting container. A stand member installed at the bottom of the glass melting container, a plurality of protective members having cutouts that avoid the nozzles along the outer shape of the glass melting container, and the plurality of protecting members of the glass melting container. A protective device for protecting a glass melting container, which is composed of a fixing member held on an outer peripheral surface. 5. The protection device for protecting a glass melting container according to claim 4, wherein the plurality of protection members have an engaging portion with the fixing member formed at an upper end portion thereof.