A glass fiber drawing bushing

Abstract

The application provides a glass fiber drawing leak plate, which comprises a bottom plate, a nozzle and a heat uniformizing sleeve, a plurality of through holes are arranged on the surface of the bottom plate in an array, a nozzle is coaxially and fixedly arranged below the opening of each through hole, the outermost nozzle of the arrayed nozzles is coaxially sleeved with the heat uniformizing sleeve, one side of the heat uniformizing sleeve close to the bottom plate is fixedly connected with the bottom plate, and the inner wall of the heat uniformizing sleeve is spaced from the outer wall of the nozzle. The glass fiber drawing leak plate is provided with the heat uniformizing sleeve structure on the periphery of the nozzle, the heat uniformizing sleeve is used to reduce the heat loss of the nozzle, simultaneously conduct the heat of the adjacent nozzles in the circumferential direction, reduce the temperature difference of the outer nozzle along the axial surface, and thus reduce the wear difference of the inner side of the nozzle caused by the temperature difference; in addition, the heat uniformizing sleeve can block and buffer the airflow flowing to the outer wall of the nozzle at a high speed, also can reduce the material loss of the nozzle surface, and prolong the service life.

Description

Technical Field

[0001] This invention relates to the field of glass fiber production technology, and in particular to a glass fiber drawing stencil. Background Technology

[0002] Glass fiber is made by drawing molten homogeneous glass raw material through a drawing spindle. Due to the harsh conditions of the drawing process, the high temperature environment and high-speed contact interface make the drawing spindle easy to be damaged.

[0003] Fiber drawing bushings are generally made of precious metals. Therefore, in order to save equipment costs and reduce energy and material waste, it is necessary to minimize unnecessary damage to the fiber drawing bushing. In the existing technology, the bottom nozzle of the fiber drawing bushing is mostly welded and fixed to the bottom of the bushing cavity. Therefore, the nozzle opening will be in different working positions during operation, and the opening temperature of different nozzles is also affected by the nozzle's position. Even for the same nozzle, different sides of the opening will have different temperatures. However, during the fiber drawing process, the heat conduction between the molten glass and the inner wall of the nozzle during ejection causes temperature differences in the molten glass on different sides. This temperature difference causes differences in the viscosity of the molten glass and the friction between it and the inner wall of the nozzle. In the long-term differential wear process, uneven defects appear in the nozzle opening, ultimately resulting in the glass fiber ejection quality not meeting the requirements, and the bushing must be scrapped.

[0004] Therefore, how to reduce the temperature difference between different sides of the nozzle and improve the service life of the wire drawing die has become one of the urgent technical problems to be solved. Summary of the Invention

[0005] In view of this, the present invention proposes a glass fiber drawing sprue, which aims to reduce the problem of uneven nozzle defects and premature scrapping of the sprue caused by uneven circumferential temperature distribution of the nozzle.

[0006] The technical solution of the present invention is implemented as follows: The present invention provides a glass fiber drawing stencil, including a base plate, a nozzle and a heat-spreading sleeve. The base plate has a plurality of through holes arrayed on its surface. A nozzle is coaxially fixedly arranged inside each through hole. The outermost nozzle of the arrayed nozzles is coaxially fitted with a heat-spreading sleeve. The side of the heat-spreading sleeve closest to the base plate is fixedly connected to the base plate. The inner wall of the heat-spreading sleeve is spaced apart from the outer wall of the nozzle.

[0007] The uneven heating of the nozzles near the outermost edge of the array is more obvious. The side farther from the center of the nozzle array dissipates heat more quickly and therefore has a lower temperature. The molten glass in the nozzle on this side has high viscosity and high friction. During high-speed jet drawing, the high friction leads to high wear, which makes the edge of the nozzle on this side prone to premature wear and chipping. Ultimately, this results in the nozzle opening not being in the horizontal plane and easily presenting an irregular opening shape. The use of a heat-spreading sleeve serves several purposes. First, it isolates the horizontal space inside the sleeve, reducing heat loss. Second, it receives and heats heat from nearby nozzles, transferring heat to the side of the nozzle array furthest from the center via its own thermal conductivity, achieving uniform heating. Third, the sleeve acts as a windbreak. Due to the high-speed operation of the wire drawing process, the airflow at the nozzle opening is significant, easily impacting the outer edge of the nozzle opening and causing faster evaporation of the material. The heat-spreading sleeve prevents the airflow from directly impacting the nozzle, instead directing it to the sleeve's surface, thus protecting the nozzle. In this design, the heat-spreading sleeve can be made of a good thermal conductor, such as copper or copper alloys, other good thermal conductor metals, or even a good thermal conductor non-metallic material.

[0008] In some implementations, the height of the heat-equalizing sleeve is not lower than the height of the nozzle.

[0009] In some implementations, the height of the heat-equalizing sleeve is 0.01-5 mm higher than the nozzle.

[0010] In some implementations, the heat-equalizing sleeve is cylindrical.

[0011] In some embodiments, a heat-spreading conductor is also included. The heat-spreading conductor is a good conductor of heat and is cylindrical and spiral in shape. The cylindrical and spiral heat-spreading conductor is coaxially sleeved on the outer surface of the heat-spreading sleeve.

[0012] In some embodiments, the heat spreader is a spiral heat pipe, which is welded to the outer surface of the heat spreader sleeve.

[0013] In some implementations, the pitch of the heat-conducting element is 2-3 mm.

[0014] In some implementations, a heat-equalizing sleeve is coaxially fitted on the outside of each nozzle.

[0015] The glass fiber drawing stencil of the present invention has the following advantages over the prior art:

[0016] The glass fiber drawing bushing of the present invention reduces heat loss from the nozzle by setting a heat-equalizing sleeve structure around the nozzle, and at the same time conducts heat from nearby nozzles circumferentially, reducing the temperature difference along the axial surface of the outer nozzle, thereby reducing wear differences on the inner side of the nozzle caused by temperature difference; secondly, the heat-equalizing sleeve can block and buffer the high-speed airflow towards the nozzle, which can also reduce material loss on the nozzle surface and extend service life. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is an isometric view of a glass fiber drawing stencil according to one embodiment of the present invention;

[0019] Figure 2 for Figure 1 Exploded view;

[0020] Figure 3 This is an isometric view of a glass fiber drawing stencil according to another embodiment of the present invention.

[0021] In the figure: 1-base plate, 2-nozzle, 3-heating sleeve, 4-heating conductor, 11-through hole. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0024] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of this invention pertain. If any definition stated in this section is contrary to or otherwise inconsistent with a definition stated in a patent, patent application, published patent application, or other publication incorporated herein by reference, the definitions listed here shall prevail over those incorporated herein by reference.

[0027] like Figure 1 As shown, combined with Figure 2 According to one embodiment of the present invention, a glass fiber drawing stencil includes a base plate 1, a nozzle 2 and a heat-spreading sleeve 3. The surface of the base plate 1 is provided with a plurality of through holes 11 arranged in an array. A nozzle 2 is coaxially fixedly arranged inside each through hole 11. The outermost nozzle 2 of the array is coaxially fitted with a heat-spreading sleeve 3. The side of the heat-spreading sleeve 3 closest to the base plate 1 is fixedly connected to the base plate 1. The inner wall of the heat-spreading sleeve 3 is spaced apart from the outer wall of the nozzle 2.

[0028] In the above embodiments, the nozzle 2 is welded and fixed inside the through hole 11 of the base plate 1. In a specific example, the nozzle 2 is coaxially embedded in the through hole 11, and the end of the nozzle 2 near the base plate 1 has an opening that is flush with or slightly protrudes from the cover surface of the base plate 1 away from the nozzle 2. The welding is done by argon arc welding.

[0029] In the above embodiments, the nozzle 2 and the base plate 1 are made of the same material. The nozzle 2 has a cylindrical channel inside. The outer surface of the nozzle 2 can be a cylindrical surface or a conical surface.

[0030] In the above embodiments, the heat-spreading sleeve 3 is a good conductor of heat, such as copper or copper alloy. The heat-spreading sleeve 3 can be fastened to the surface of the base plate 1, for example, by threaded connection. A threaded opening is coaxially machined on the lower surface of the base plate 1 around the outside of the through hole 11, and a matching threaded opening is machined at the opening of the heat-spreading sleeve 3 near the base plate 1. The corresponding fastening connection is achieved by threading the two threaded openings together. Alternatively, a snap-fit ​​connection can be used, with a corresponding snap-fit ​​structure machined on the lower surface of the base plate 1 and a corresponding snap-fit ​​protrusion machined at the opening of the heat-spreading sleeve 3 near the base plate 1. The snap-fit ​​protrusion and the snap-fit ​​structure are used for snap-fit ​​engagement. Alternatively, a welding connection can be used, directly welding the heat-spreading sleeve 3 to the lower surface of the base plate 1.

[0031] The heat-spreading sleeve 3 can collect the heat radiated or conducted from the base plate 1 and the nearby nozzles 2. Through its own heat conduction, the heat-spreading sleeve 3 can be heated as a whole. After being heated, the heat-spreading sleeve 3 can radiate the heat to the surface of the inner nozzle 2 again. On the one hand, it maintains the temperature of the nozzle 2 and prevents the nozzle 2 from cooling down, which would increase the flow resistance of the internal glass. On the other hand, the heat-spreading sleeve 3 can reduce the heat dissipation efficiency of the inner nozzle 2. Furthermore, the heat-spreading sleeve 3 can block the airflow from all sides, preventing the airflow from blowing directly onto the surface of the inner nozzle 2, reducing the evaporation loss rate of the material on the surface of the nozzle 2, and extending its service life.

[0032] Due to the presence of the heat-equalizing sleeve 3, the circumferential temperature difference of the inner nozzle 2 is lower. Furthermore, the temperature maintenance effect of the nozzle 2 is better, which greatly reduces the friction of the inner flowing glass and reduces the frictional loss of the nozzle 2.

[0033] In some embodiments, the height of the heat-spreading sleeve 3 is not lower than the height of the nozzle 2.

[0034] In the above embodiments, when the height of the heat-spreading sleeve 3 is not lower than the height of the nozzle 2, the surrounding airflow cannot directly impact the nozzle 2. Furthermore, the overall heat preservation and heating effect of the nozzle 2 is better.

[0035] In some embodiments, the height of the heat-spreading sleeve 3 is 0.01-5 mm above the nozzle 2.

[0036] With the aforementioned optimal dimensions, the heat-spreading sleeve 3 can completely protect the nozzle 2 without interfering with the glass fiber ejected from the nozzle 2.

[0037] In some embodiments, the heat-equalizing sleeve 3 is cylindrical.

[0038] In the above embodiments, in the preferred exemplary structure, when the heat-spreading sleeve 3 is cylindrical, it can maintain a consistent distance from the nozzle 2 in all directions, which is beneficial to further improve the heating uniformity of the nozzle 2.

[0039] In some embodiments, a heat-spreading conductive element 4 is also included. The heat-spreading conductive element 4 is a good conductor of heat. The heat-spreading conductive element 4 is cylindrical and spiral in shape. The cylindrical and spiral heat-spreading conductive element 4 is coaxially sleeved on the outer surface of the heat-spreading sleeve 3.

[0040] In the above embodiments, as a further preferred solution, although the heat distribution sleeve 3 can uniformly distribute the heat absorbed from the outside along the axial direction, the heat dissipation is still faster at the temperature drop points due to the influence of the external temperature distribution. Therefore, the heat compensation effect of the heat distribution sleeve 3 is relatively limited. Therefore, in order to improve the uniformity of this uniform distribution, a cylindrical spiral heat distribution conductor 4 is used to further transfer the heat received from the outside. Compared with the heat distribution sleeve, the cylindrical spiral heat distribution conductor 4 has directional heat transfer and faster heat conduction. It can compensate for the heat loss of the heat distribution sleeve 3 to a certain extent, further improve the temperature uniformity of the heat distribution sleeve 3 along the circumferential direction, thereby improving the temperature uniformity of the inner nozzle 2 along the circumferential direction.

[0041] In some embodiments, the heat-spreading conductor 4 is a spiral heat pipe, and the heat-spreading conductor 4 is welded to the outer surface of the heat-spreading sleeve.

[0042] The above embodiments are preferred examples. The heat pipe has a high heat transfer rate and can maximize the temperature uniformity of the heat spreader 3 along the circumference.

[0043] In some embodiments, the pitch of the heat-conducting element 4 is 2-3 mm.

[0044] like Figure 3 As shown, in some embodiments, a heat-equalizing sleeve 3 is coaxially fitted on the outer side of each nozzle 2.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A glass fiber drawing stencil, characterized in that, The device includes a base plate (1), a nozzle (2), and a heat-spreading sleeve (3). The base plate (1) has several through holes (11) arranged in an array. A nozzle (2) is coaxially fixed inside each through hole (11). The outermost nozzle (2) of the arrayed nozzles (2) is coaxially fitted with a heat-spreading sleeve (3). The side of the heat-spreading sleeve (3) close to the base plate (1) is fixedly connected to the base plate (1). The inner wall of the heat-spreading sleeve (3) is spaced apart from the outer wall of the nozzle (2). The device also includes a heat-spreading conductive element (4). The heat-spreading conductive element (4) is a good conductor of heat. The heat-spreading conductive element (4) is cylindrical and spiral. The cylindrical and spiral heat-spreading conductive element (4) is coaxially fitted on the outer surface of the heat-spreading sleeve (3). The heat-spreading conductive element (4) is a spiral heat pipe. The heat-spreading conductive element (4) is welded to the outer surface of the heat-spreading sleeve (3). The pitch of the heat-spreading conductive element (4) is 2-3 mm.

2. The glass fiber drawing stencil as described in claim 1, characterized in that, The height of the heat-spreading sleeve (3) is not lower than the height of the nozzle (2).

3. The glass fiber drawing stencil as described in claim 2, characterized in that, The height of the heat-spreading sleeve (3) is 0.01-5mm higher than that of the nozzle (2).

4. The glass fiber drawing stencil as described in claim 1, characterized in that, The heat-equalizing sleeve (3) is cylindrical.

5. The glass fiber drawing stencil as described in claim 1, characterized in that, Each nozzle (2) is coaxially fitted with a heat-spreading sleeve (3) on its outer side.

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