JP2018062436A - Spinning apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spinning apparatus including a new cooling structure and capable of preventing molten glass from leaking from a space between a bushing and a bushing block.SOLUTION: A spinning apparatus 100 for molding glass fibers from molten glass G comprises a connecting member 20 connected to a molten glass supply source; and a bushing attached to the connecting member. The bushing comprises an introductory part 11 into which the molten glass G is introduced; a base plate 12a having a bushing nozzle 12b; a body 12 having an enlarged part enlarged as the flow cross-sectional area of the molten glass G goes to the base plate 12a from the side of the introductory part 11; a flange 13 provided along the peripheral end of the introductory part 11; and a cooling pipe 30 attached to an end portion of the flange 13 or the vicinity of the end portion and having a refrigerant flowing through the inside.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a spinning device for forming glass fibers from molten glass.

  For example, glass fibers used as constituent materials for automobile interior materials, printed circuit boards for electronic devices, building materials, and the like are generally manufactured by the following manufacturing process. First, a glass raw material or a solid glass material is heated to a melting point or higher in a glass melting furnace to obtain a molten glass having fluidity. Next, the molten glass is clarified and homogenized and supplied to the spinning device via the fore bay and feeder. The spinning device includes a bushing, a bushing block, a flow block, and the like. A bushing, which is a main member of the spinning device, is a metal member made of a noble metal such as platinum, and can maintain the molten glass in a high temperature state by Joule heat generated by energization. A base plate having a large number of bushing nozzles is provided at the bottom of the bushing. When molten glass is discharged from the bushing nozzle, a glass fiber monofilament is formed. After cooling, the glass fiber monofilament is coated with a sizing agent on the surface, and a large number of glass filament monofilaments are made into glass strands (multifilaments). The glass strand is wound around a collet to form a glass cake.

  As described above, a spinning device that forms molten glass into glass fibers is always in contact with high-temperature molten glass, and in particular, a bushing that is a metal member is easily deformed by thermal expansion or the like. Therefore, if the spinning device continues to operate for a long period of time, the bushing is deformed, and a gap is formed between the bushing and the bushing block due to the deformation of the bushing, and there is a possibility that the molten glass leaks out from the gap.

  Therefore, measures are taken in the bushing to prevent leakage of molten glass. For example, in a conventional glass fiber spinning device, a bushing flange that is an attachment portion to a bushing block is provided with a cooling pipe (see, for example, Patent Document 1). Patent Document 1 shows a box-shaped bushing in which a cooling pipe is attached below a flange provided on a side wall. In the bushing of Patent Document 1, when the molten glass permeates the gasket sandwiched between the bushing and the bushing block, the gasket containing the molten glass is cooled by a cooling pipe, and the molten glass is solidified, whereby the bushing and the bushing It is intended to maintain the seal with the block.

JP-A-8-245235

  Since the bushing of Patent Document 1 has a box shape, there is a space directly under the cooling pipe. Therefore, the influence of the radiant heat that the cooling pipe receives from the bushing is relatively small, and it is considered that there is not much restriction on the mounting position and configuration of the cooling pipe. However, the current bushing generally has a shape in which the flow cross-sectional area of the molten glass continuously or stepwise expands downward in order to secure the production amount of glass fiber. In the bushing having such an enlarged portion, in order to prevent the molten glass from leaking over a long period of time, the structure of the cooling pipe is very important. The mounting position of the cooling pipe in the flange and the incidental structure of the cooling pipe It is necessary to devise such as.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a spinning device having a new cooling structure for preventing molten glass from leaking through a gap between a bushing and a bushing block. .

The characteristic configuration of the spinning device according to the present invention for solving the above problems is as follows:
A spinning device for forming glass fibers from molten glass,
A connection member connected to the molten glass supply source, and a bushing attached to the connection member;
The bushing is
An introduction part into which the molten glass is introduced;
A base plate having a bushing nozzle;
A main body having an enlarged portion that expands as the flow cross-sectional area of the molten glass moves from the introduction portion side toward the base plate;
A flange provided along a peripheral edge of the introduction portion;
A cooling pipe that is attached to or near the end of the flange and through which the refrigerant flows;
It is in having.

  According to the spinning device of this configuration, the introduction part into which the molten glass is introduced, the base plate having the bushing nozzle, and the main body having the enlarged part that expands as the flow cross-sectional area of the molten glass moves from the introduction part side to the base plate, In the bushing provided with a flange provided along the peripheral end of the introduction portion and attached to the connection member, a cooling pipe through which the refrigerant flows is attached to the end of the flange or in the vicinity of the end. The flange can be appropriately cooled in a state where it is not affected by the heat from the bushing body as much as possible. Therefore, even if a gap occurs between the bushing and the connecting member due to the long-term operation of the spinning device, the molten glass that attempts to spread laterally from the gap is solidified near the position where the cooling pipe is attached to the flange and melted. It is possible to prevent the glass from leaking to the outside.

In the spinning device according to the present invention,
It is preferable to further include a pressing mechanism that presses the cooling pipe toward the connection member.

  According to the spinning device of this configuration, even when the gap generated between the bushing and the connection member tends to expand due to heat, the cooling pipe is pressed toward the connection member by the pressing mechanism, thereby connecting the bushing. The gap with the member can be reduced. As a result, leakage of the molten glass to the outside can be reliably prevented.

In the spinning device according to the present invention,
The pressing mechanism preferably includes a buffer material at a location where the cooling pipe is in contact with the pressing.

  According to the spinning device of this configuration, the pressing mechanism does not directly contact and press the cooling pipe, but presses it through the cushioning material, so that the pressing force applied to the cooling pipe is equalized and the pressing mechanism is pressed. The dent and breakage of the cooling pipe due to the pressure can be prevented.

In the spinning device according to the present invention,
The cooling pipe preferably has a rectangular cross section.

  According to the spinning device of this configuration, by forming the cross section of the cooling pipe in a rectangular shape, the degree of adhesion (contact area) of the cooling pipe to the flange can be improved, and the cooling effect can be enhanced. In addition, since the contact area between the pressing mechanism and the cooling pipe also increases, the pressing force applied to the cooling pipe is more equalized, and the depression and breakage of the cooling pipe can be more reliably prevented.

In the spinning device according to the present invention,
The shortest vertical distance from the position where the cooling pipe is provided in the flange to the position where the flow cross-sectional area of the molten glass in the main body is most enlarged is a,
The shortest horizontal distance from the boundary position between the introduction part and the flange to the position where the cooling pipe is provided in the flange is b,
When the shortest distance from the outer surface portion of the cooling pipe installed on the flange to the main body is c,
The bushing is preferably configured to satisfy 0.5 ≦ a / b ≦ 2.5 and 0.5 ≦ c / b ≦ 1.5.

  According to the spinning device of this configuration, since the position where the cooling pipe is provided in the flange is set in the above-described appropriate range, even if a gap is generated between the bushing and the connecting member, The molten glass to be spread is firmly solidified and the sealing property of the bushing can be maintained for a long time.

FIG. 1 is a schematic cross-sectional view showing the overall structure of the spinning device of the present invention. FIG. 2 is an explanatory view (schematic cross-sectional view) of the mounting position of the cooling pipe in the bushing flange.

  Hereinafter, an embodiment relating to the spinning device of the present invention will be described with reference to FIGS. 1 and 2. However, the present invention is not intended to be limited to the configurations described in the embodiments and drawings described below.

  FIG. 1 is a schematic cross-sectional view showing the overall structure of the spinning device 100 of the present invention. The spinning device 100 is a part of a glass fiber manufacturing device, and includes a bushing 10 and a bushing block 20 as a connecting member that connects the bushing 10 to a molten glass supply source.

[Overall configuration of spinning device]
The molten glass supply source includes a glass melting furnace (not shown), a fore bay (not shown), a feeder 50, and the like. The feeder 50 is a supply path for supplying the molten glass G to the spinning device 100 while conveying the molten glass G, and a casing 52 serving as a base and a flow block 53 for forming a supply port 51 for the molten glass G are provided on the bottom surface side. It is done. When the bushing 10 is installed in the feeder 50, the bushing block 20 that is a connecting member is connected to the flow block 53, and the bushing 10 is attached to the bushing block 20. The bushing block 20 is made of a refractory material such as chrome brick or zircon brick. The bushing block 20 is fixed to the casing 52 using a block holder H1. The bushing 10 is fixed to the casing 52 using a bushing holder H2. Thus, by attaching the bushing 10 to the flow block 53 via the bushing block 20, it is not necessary to replace the entire spinning device 100 even when the bushing 10 needs to be replaced due to deterioration or the like. It is not necessary to replace the bushing block 20 to which the bushing 10 is directly attached. It is also possible to form a plurality of spinning devices 100 by forming a plurality of supply ports 51 (flow blocks 53) in the feeder 50 and connecting the bushing block 20 and the bushing 10 to each of the supply ports 51. In this case, the molten glass G can be simultaneously supplied to the plurality of spinning devices 100.

[Bushing]
The bushing 10 is a type of molded member that molds the molten glass G into glass fibers. The bushing 10 includes an introduction portion 11 into which molten glass G is introduced, a main body 12, and a flange 13 as main components. As shown in FIG. 1, the introduction portion 11 has a tubular shape extending downward along the periphery of the supply port 51 of the molten glass G, is connected to the bushing block 20, and is connected to the lower body 12. Is formed. The main body 12 has an enlarged portion where the flow cross-sectional area of the molten glass G expands from the introduction portion 11 side along the traveling direction (the direction of a base plate 12a described later). Accordingly, the main body 12 has a cross-sectional shape like a bell shown in FIG. 1 (a shape having an enlarged portion in which the flow cross-sectional area continuously expands downward and a constant portion in which the cross-sectional area becomes constant along the lower portion. ), Or a cross-sectional shape like a staircase (a shape in which the flow cross-sectional area expands stepwise along the lower side). Further, in FIG. 1, the bushing 10 includes an introduction portion 11 that does not have a portion in which the flow area increases, and the main body 12 includes an expansion portion and a constant portion. The main body 12 does not have a portion where the area does not expand, and the main body 12 does not have a fixed portion, and the flow area continuously increases from the portion connected to the bushing block 20 to the base plate 12a along the traveling direction. The configuration may be a so-called frustum shape. In such a configuration, the introduction part 11 and the main body 12 may not be distinguished from each other. In this case, the opening part becomes the introduction part 11. A base plate 12a is attached to the bottom of the main body 12, and a number of bushing nozzles 12b having hollow portions for spinning glass fibers are formed on the base plate 12a. Further, a screen (not shown) for homogenizing the molten glass G and preventing foreign matter from accumulating on the bushing nozzle 12b may be provided inside the main body 12 as necessary. The flange 13 is a plate-like member provided along the peripheral end of the introduction portion 11. The flange 13 abuts on the bushing block 20 and ensures the sealing performance between the bushing 10 and the bushing block 20.

(Cooling pipe)
The bushing 10 is made of a noble metal such as platinum, and the bushing block 20 is made of a refractory material such as chrome brick or zircon brick. For this reason, if the spinning device 100 is continuously operated over a long period of time, a gap is likely to be generated between the bushing 10 and the bushing block 20 due to a difference in thermal expansion coefficient between the bushing 10 and the bushing block 20. . And when such a clearance gap arises, there exists a possibility that the molten glass G permeates into the clearance gap, spreads to the side, and leaks outside the bushing 10. Therefore, in the present invention, in order to prevent the molten glass G from leaking out, the cooling pipe 30 is attached to the end of the flange 13 or in the vicinity of the end. A cooling medium such as water is passed through the cooling pipe 30 to cool the flange 13 by heat exchange. Therefore, even if a gap occurs between the bushing 10 and the bushing block 20 and the molten glass G may leak to the outside through the gap, the molten glass G is flanged by cooling by the cooling pipe 30. 13 is solidified in the vicinity of the mounting position of the cooling pipe 30 and is prevented from leaking out of the bushing 10. Further, since the cooling pipe 30 can appropriately cool the flange 13 in a state where it is not affected by the heat generated from the main body 12 of the bushing 10 as much as possible, it is possible to continue operating the spinning device 100 for a long period of time. It becomes.

  The cooling pipe 30 is preferably made of a material having excellent thermal conductivity in order to increase the cooling efficiency of the flange 13. Preferred materials for the cooling pipe 30 include stainless steel, aluminum, titanium, nickel, copper, or alloys thereof. Moreover, it is preferable that the cooling pipe 30 has a rectangular cross section. In this case, since the mounting surface 30a (shown in FIG. 2) of the cooling pipe 30 is in close contact with the flange 13 and a large contact area between them can be secured, the cooling effect can be further enhanced. Further, if the cooling pipe 30 has a rectangular cross section, the pressing force applied to the cooling pipe 30 is equalized by the pressing mechanism 40 described later, so that the cooling pipe 30 is prevented from being dented or damaged by the pressing force. be able to.

(Pressing mechanism)
If the gap between the bushing 10 and the bushing block 20 becomes relatively large due to the operation of the spinning device 100 over a long period of time, the molten glass G may not be sufficiently solidified even if the flange 13 is cooled by the cooling pipe 30. Therefore, in the present invention, in order to reduce the gap between the bushing 10 and the bushing block 20, a pressing mechanism 40 that presses the cooling pipe 30 toward the bushing block 20 can be further provided. As shown in FIG. 1, for example, the pressing mechanism 40 includes a support member 41 that supports the bushing 10 and a bolt 42 that passes through the support member 41. In the pressing mechanism 40, when the bolt 42 is rotated clockwise, the tip of the bolt 42 presses the cooling pipe 30, and the cooling pipe 30 is pushed up together with the flange 13 toward the bushing block 20. As a result, the distance of the flange 13 to the bushing block 20 is reduced, and the gap between the bushing 10 and the bushing block 20 is reduced. Accordingly, the molten glass G is solidified in the vicinity of the attachment position of the cooling pipe 30 in the flange 13, and the molten glass G is prevented from leaking out of the bushing 10.

  The rotational torque generated by rotating the bolt 42 is set to an appropriate value. In the case of the pressing mechanism 40 using the bolt 42 that passes through the support member 41 of the present embodiment, it is preferable that the rotational torque at which the tip of the bolt 42 presses the cooling pipe 30 is set to 30 N · m or more, and 50 N · m or more. It is more preferable to set to. If the rotational torque by the bolt 42 is 30 N · m or more, the gap between the bushing 10 and the bushing block 20 can be reliably reduced, and leakage of the molten glass G to the outside can be more reliably prevented.

  The pressing mechanism 40 is preferably provided with a buffer material 43 that equalizes the pressing force applied to the cooling pipe 30 when the cooling pipe 30 is pressed. In the pressing mechanism 40 shown in FIG. 1, a cushioning material 43 is attached to the tip of the bolt 42. Since the bolt 42 presses the cooling pipe 30 through the buffer material 43, the depression or breakage of the cooling pipe 30 due to the pressing force can be prevented. The buffer material 43 may be provided not on the tip of the bolt 42 but on the surface of the cooling pipe 30. Since the buffer material 43 is in contact with the cooling pipe 30, its contact surface is not exposed to an extremely high temperature, but there is a high-temperature atmosphere around it, and since it can receive radiant heat from the bushing 10, it has a certain heat resistance. It is preferable that it is made of a material having a property. Examples of such materials include metals, heat resistant resins, heat resistant rubbers, and the like.

[Cooling tube mounting position]
In order to solidify the molten glass G to be leaked from the gap between the bushing 10 and the bushing block 20 without reducing the temperature of the molten glass G flowing inside the bushing 10 as much as possible, an appropriate cooling pipe 30 is used. It is necessary to arrange it in a proper place and cool it appropriately. Therefore, the present inventors have made a detailed study on the mounting position of the cooling pipe 30 on the flange 13 of the bushing 10. FIG. 2 is an explanatory diagram (schematic cross-sectional view) of a mounting position of the cooling pipe 30 on the flange 13. In FIG. 2, for convenience of explanation, the support member 41, the bolt 42, the flow block 53, and the like shown in FIG. 1 are omitted.

  As described above, the cooling pipe 30 is attached to the end of the flange 13 or in the vicinity of the end. Here, as shown in FIG. 2, the shortest vertical from the attachment position of the cooling pipe 30 on the flange 13 (the attachment surface 30a of the cooling pipe 30) to the position where the flow cross-sectional area of the molten glass G in the main body 12 is expanded most. The distance is a, the shortest horizontal distance from the boundary position between the introduction part 11 and the flange 13 to the mounting position of the cooling pipe 30 on the flange 13 is b, and the outer surface of the cooling pipe 30 installed on the flange 13 (cooling) It is preferable that 0.5 ≦ a / b ≦ 2.5 and 0.5 ≦ c / b ≦ 1.5 are satisfied, where c is the shortest distance from the corner 30b) of the tube 30 to the main body 12. If the shape of the bushing 10 and the mounting position of the cooling pipe 30 are set so as to satisfy 1.0 ≦ a / b ≦ 2.0 and 0.8 ≦ c / b ≦ 1.2, the bushing 1 That a leakage prevention of the molten glass G from the gap between the bushing block 20 can be reliably achieved was found. That is, if the mounting position of the cooling pipe 30 on the flange 13 is set to the range of 0.5 ≦ a / b ≦ 2.5 and 0.5 ≦ c / b ≦ 1.5, the bushing 10 and the bushing block 20 Even if a gap occurs between them, the molten glass G that spreads laterally from the gap is solidified reliably, and the sealing performance of the bushing 10 can be maintained over a long period of time. When the mounting position of the cooling pipe 30 on the flange 13 is 0.5> a / b and 0.5> c / b, the cooling pipe 40 is easily affected by the heat generated from the main body 12 of the bushing 10, It may be difficult to sufficiently cool and solidify the leaked molten glass G. When the mounting position of the cooling pipe 30 on the flange 13 is 2.5 <a / b and 1.5 <c / b, it is necessary to form the flange 13 in a considerably wide shape. Since the amount of use increases, the possibility that the bushing 10 is actually designed and used in the spinning device 100 is low.

  Incidentally, in the case of a normal bushing (width 400 to 700 mm, height 40 to 70 mm) used for the production of glass fiber, the above shortest vertical distance a is in the range of 10 to 50 mm, and the above shortest horizontal distance. b is in the range of 20 to 40 mm, and the shortest distance c is preferably 10 to 50 mm.

<Another embodiment>
The spinning device 100 according to the present invention can be used in various ways other than the above embodiment as long as the object of the present invention of preventing the molten glass G from leaking from the gap between the bushing 10 and the bushing block 20 can be achieved. Modifications can be made. Hereinafter, such a modification will be described as another embodiment.

[Another embodiment 1]
In the above-described embodiment, the pressing mechanism 40 that presses the cooling pipe 30 toward the bushing block 20 has been described as including the support member 41 that supports the bushing 10 and the bolt 42 that passes through the support member 41. As for the bolt 42, another configuration may be adopted as long as the cooling pipe 30 is pressed toward the bushing block 20. For example, in the pressing mechanism 40, a jack, a hydraulic cylinder, an electromagnetic actuator, or the like can be employed instead of the bolt 42.

[Another embodiment 2]
In the above embodiment, the rotational torque of the bolt 42 is preferably set to 30 N · m or more. However, when a plurality of pressing mechanisms 40 are installed in the bushing 10, the position of the cooling pipe 30 provided in the bushing 10. It is also possible to change the rotational torque of the bolt 42 according to the above. For example, in a portion where the gap between the bushing 10 and the bushing block 20 tends to be relatively large, the rotation torque of the bolt 42 is set to be large in order to prevent the cooling efficiency of the cooling pipe 30 from being lowered due to the expansion of the gap. The gap between the bushing 10 and the bushing block 20 can be kept to a minimum.

[Another embodiment 3]
In the above embodiment, the cooling pipe 30 has been described as being attached to the end of the flange 13 or the vicinity of the end, but the cooling pipe 30 and the flange 13 may be configured integrally. For example, an end portion of the flange 13 is folded back and the end portion is welded to the surface of the flange 13 to form an annular portion, and another pipe is connected to both ends of the annular portion to allow the coolant to flow. It is also possible. In this case, since the cooling pipe 30 also serves as a part of the flange 13, the cooling efficiency is high, which is effective for preventing the molten glass G from leaking out.

DESCRIPTION OF SYMBOLS 10 Bushing 11 Introducing part 12 Main body 12a Base plate 12b Bushing nozzle 13 Flange 20 Bushing block (connection member)
30 Cooling Tube 40 Pressing Mechanism 42 Bolt 43 Buffer Material 100 Spinning Device

Claims (5)

A spinning device for forming glass fibers from molten glass,
A connection member connected to the molten glass supply source, and a bushing attached to the connection member;
The bushing is
An introduction part into which the molten glass is introduced;
A base plate having a bushing nozzle;
A main body having an enlarged portion that expands as the flow cross-sectional area of the molten glass moves from the introduction portion side toward the base plate;
A flange provided along a peripheral edge of the introduction portion;
A cooling pipe that is attached to or near the end of the flange and through which the refrigerant flows;
A spinning device comprising:   The spinning device according to claim 1, further comprising a pressing mechanism that presses the cooling pipe toward the connection member.   The spinning device according to claim 2, wherein the pressing mechanism includes a cushioning material at a location in contact with the cooling pipe.   The spinning device according to any one of claims 1 to 3, wherein the cooling pipe has a rectangular cross section. The shortest vertical distance from the position where the cooling pipe is provided in the flange to the position where the flow cross-sectional area of the molten glass in the main body is most enlarged is a,
The shortest horizontal distance from the boundary position between the introduction part and the flange to the position where the cooling pipe is provided in the flange is b,
When the shortest distance from the outer surface portion of the cooling pipe installed on the flange to the main body is c,
The spinning device according to claim 1, wherein the bushing is configured to satisfy 0.5 ≦ a / b ≦ 2.5 and 0.5 ≦ c / b ≦ 1.5. .

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