Low-thermal-expansion-coefficient glass fiber wire-drawing bushing and kiln

Abstract

The invention relates to the technical field of glass fiber processing, and provides a low-thermal-expansion-coefficient glass fiber wire-drawing bushing plate and a kiln, the low-thermal-expansion-coefficient glass fiber wire-drawing bushing plate comprises a bushing box and a discharge spout, the discharge spout comprises a wire-drawing part and a guide part, and the wire-drawing part is fixed on the bottom side of the bushing box in a penetrating manner; the guide part is integrally formed on the top side of the wire drawing part, is in sealed communication with the wire drawing part and is continuously arranged; the bottom end of the guide part is round and is flush with the bottom side in the leakage box, and the top end of the guide part is oval and inclines relative to the bottom side in the leakage box. The discharge spout comprises the wire drawing part and the guide part, the top end of the guide part is of the inclined elliptical structure, and the wire drawing part partially protrudes out of the side wall of the wire drawing part, so that the discharge spout and the leakage box can be positioned through the protruding structure, and the welding machining efficiency of the discharge spout and the leakage box is improved; and bubbles or impurities in the glass liquid can be cut and separated by utilizing the top end of the guide part, so that the processing quality of the glass fiber is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of glass fiber processing, in particular to a glass fiber drawing bushing with a low thermal expansion coefficient and a kiln. Background Art

[0002] The rapid development of electronic printed circuit boards, automotive, military, and aerospace technologies is placing higher demands on the performance of glass fiber, while also imposing stricter control standards for production efficiency and energy consumption. Currently, most glass fibers have a high coefficient of thermal expansion, limiting their application in high-end applications.

[0003] In the glass fiber production process, drawing bushings and kilns are core process equipment, and their performance directly affects the yield, quality, and production cost of glass fiber. Currently, the glass fiber drawing bushings widely used in the market are mostly made of platinum or its alloys, leveraging their high-temperature stability and excellent corrosion resistance to ensure continuous and stable production of glass fiber.

[0004] A drawing plate typically consists of a box and nozzles. For example, Patent Publication No. CN114770051B discloses a process for processing a low-thermal-expansion-coefficient glass fiber drawing plate. To process the drawing plate, the plate must first be cut into a molded form, with several holes formed at the bottom. A cylinder is then welded to the bottom of the holes. However, each plate requires a large number of nozzles to be welded, and the small nozzles are difficult to position, reducing the plate's processing efficiency. Furthermore, during the glass fiber drawing process, bubbles or partially softened hard materials may be present in the softened glass liquid on the top side of the plate, leading to nozzle blockage and other issues, affecting the glass fiber processing quality. Summary of the Invention

[0005] In view of this, the present invention proposes a glass fiber drawing leak plate and kiln with a low thermal expansion coefficient, which can reduce the risk of clogging of the leak nozzle and ensure the processing quality of the glass fiber.

[0006] The technical solution of the present invention is implemented as follows: On the one hand, the present invention provides a low thermal expansion coefficient glass fiber drawing leakage plate, including a leakage box and a leakage nozzle, the leakage nozzle includes a drawing part and a guide part, wherein,

[0007] The wire drawing portion is fixed through the bottom side of the leakage box; the guide portion is integrally formed on the top side of the wire drawing portion, and is sealed and connected thereto and continuously arranged; the bottom end of the guide portion is circular and flush with the bottom side of the leakage box, and the top end of the guide portion is elliptical and inclined with the bottom side of the leakage box;

[0008] The two endpoints of the long axis of the top end of the guide part are point A and point B respectively, the two endpoints of the short axis of the top end of the guide part are point C and point D respectively, and point B is the lowest point of the top end of the guide part; the diameter of the bottom end of the guide part is larger than the distance between point C and point D, and smaller than the distance between point A and point B; the radius of the bottom end of the guide part is larger than the distance between point A, point C and point D and the axis of the wire drawing part, and smaller than the distance between point B and the axis of the wire drawing part.

[0009] On the basis of the above technical solution, preferably, it further comprises a stabilizing plate, which is detachably fixed in the leak box, has a density greater than the density of the softened glass in the leak box, a melting point higher than the melting point of the leak box, and a specific heat capacity greater than the specific heat capacity of the leak box;

[0010] A liquid flow hole is provided in the stabilizing plate, and a projection of the liquid flow hole on the inner bottom side of the drain box and a projection of the top side of the guide portion on the inner bottom side of the drain box are spaced apart.

[0011] More preferably, the nozzles and the liquid flow holes are provided in multiple groups, and the multiple groups of nozzles correspond to the multiple groups of liquid flow holes one by one; each group of nozzles is provided with multiple nozzles, and the multiple nozzles in the same group are arranged circumferentially around the center line of the liquid flow hole;

[0012] Point B is located on the side of the nozzle close to another nozzle in the same group and adjacent to it.

[0013] More preferably, the projection shapes of the top ends of two adjacent and different groups of the guide portions on the inner bottom side of the drain box are different.

[0014] More preferably, it further includes a blind column, which is fixedly arranged on the bottom side of the leakage box, and the projection of the blind column on the bottom side of the leakage box coincides with the projection of the liquid flow hole on the bottom side of the leakage box; the specific heat capacity of the blind column is greater than the specific heat capacity of the leakage nozzle.

[0015] More preferably, the lower end of the blind column is located above the lower end of the wire drawing portion, and the outer diameter of the blind column is equal to the outer diameter of the wire drawing portion.

[0016] On the basis of the above technical solution, preferably, point B is located above the inner bottom side of the leakage box.

[0017] In a second aspect, the present invention provides a low thermal expansion coefficient glass fiber drawing furnace, comprising a furnace body and the above-mentioned glass fiber drawing bushing, wherein:

[0018] The furnace body is provided with a melting chamber, a material channel and an ascending flow channel, the material channel is located above the bottom end of the melting chamber, and the two ends of the ascending flow channel are respectively connected to the melting chamber and the material channel;

[0019] A feed port is provided on the peripheral side of the furnace body, and a discharge port is provided on the bottom side of the furnace body, wherein the feed port and the discharge port are respectively connected to the upper and lower ends of the melting chamber;

[0020] A mounting hole is provided on the bottom side of the furnace body, the mounting hole is communicated with the material channel, and the leakage box is fixedly arranged in the mounting hole.

[0021] On the basis of the above technical solution, it is preferred that it further comprises a plurality of partitions and a plurality of combustion guns, wherein:

[0022] The partition is fixedly arranged above the material channel, and a plurality of the partitions are arranged in parallel and at intervals;

[0023] The combustion gun is fixed on the side wall of the furnace body, and its output end is located above the material channel. At least one combustion gun is arranged between two adjacent partitions.

[0024] The mounting holes and the drain boxes are both provided in plurality and correspond one to one, and the mounting holes are located below between two adjacent partitions.

[0025] More preferably, it further includes a molybdenum electrode, a plurality of thermocouples and a control device, wherein,

[0026] The molybdenum electrode is fixed through the side wall of the furnace body, and its output end is located in the melting chamber;

[0027] The plurality of thermocouples are all fixed through the furnace body, and the output ends thereof are respectively located in the melting chamber, the material channel and the ascending flow channel;

[0028] The control device is used to adjust the oxygen-fuel ratio of the combustion gun and the power of the molybdenum electrode.

[0029] The low thermal expansion coefficient glass fiber drawing bushing and kiln of the present invention have the following beneficial effects compared with the prior art:

[0030] (1) The nozzle is configured to include a drawing portion and a guide portion, the top of the guide portion is formed into an inclined elliptical structure, and a portion of the drawing portion is protruded from the side wall of the drawing portion. This protruding structure can be used to position the nozzle and the nozzle box to improve the welding processing efficiency, and the top of the guide portion can be used to cut and separate bubbles or impurities in the glass liquid to ensure the processing quality of the glass fiber;

[0031] (2) By setting a stabilizing plate, multiple nozzles are arranged in a circular array around the center line of the liquid hole, and the protruding structure of the guide part is close to the nozzles adjacent to it and in the same group. This not only allows the glass liquid to generate a vortex flow, thereby accelerating the drawing efficiency of the glass fiber, but also improves the temperature uniformity of the glass liquid in the leakage box, further improving the processing quality of the glass fiber;

[0032] (3) By setting up the blind column, not only can the end of the nozzle close to the leakage box be heated to make the glass fiber cool evenly, but the vacant space on the bottom side of the leakage box can also be filled to maintain the stability of the leakage box;

[0033] (4) By arranging multiple groups of nozzles in different ways, the drain plate can be adapted to different processing conditions, thereby improving the adaptability of the wire drawing drain plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 A cross-sectional view of a low thermal expansion coefficient glass fiber drawing furnace according to the present invention;

[0036] Figure 2 A three-dimensional diagram of a glass fiber drawing bushing with a low thermal expansion coefficient according to the present invention;

[0037] Figure 3 This is a three-dimensional diagram of the guide portion of a low thermal expansion coefficient glass fiber drawing bushing of the present invention;

[0038] Figure 4 This is a cross-sectional view of a drain nozzle in a low thermal expansion coefficient glass fiber drawing drain plate of the present invention;

[0039] Figure 5 A three-dimensional diagram of a drain nozzle in a low thermal expansion coefficient glass fiber drawing drain plate of the present invention;

[0040] Figure 6 A top view of a stabilizing plate in a glass fiber drawing bushing with a low thermal expansion coefficient according to the present invention;

[0041] Figure 7 This is a cross-sectional view of a guide portion of a low thermal expansion coefficient glass fiber drawing bushing of the present invention;

[0042] Figure 8 This is a cross-sectional view of a drain box in a low thermal expansion coefficient glass fiber drawing drain plate of the present invention;

[0043] Figure 9 A top view of a low thermal expansion coefficient glass fiber drawing leak plate of the present invention at a leak box when the leak nozzles are arranged in a first manner;

[0044] Figure 10 This is a bottom view of the drain box of a glass fiber drawing drain plate with a low thermal expansion coefficient according to the present invention when it is in the first drain nozzle arrangement mode;

[0045] Figure 11 A top view of a low thermal expansion coefficient glass fiber drawing leak plate of the present invention at a leak box when the leak nozzles are arranged in the second manner;

[0046] Figure 12 This is a bottom view of the drain box of a glass fiber drawing drain plate with a low thermal expansion coefficient according to the present invention when it is in the second drain nozzle arrangement mode;

[0047] Figure 13 A top view of a low thermal expansion coefficient glass fiber drawing bushing of the present invention at the drain box when the bushing is in the third arrangement of the drain nozzles;

[0048] Figure 14 This is a bottom view of the drain box of a glass fiber drawing drain plate with a low thermal expansion coefficient according to the present invention when it is in the third drain nozzle arrangement mode;

[0049] Figure 15 A cross-sectional view of a combustion gun in a low thermal expansion coefficient glass fiber drawing furnace according to the present invention;

[0050] Figure 16 This is a cross-sectional view of a partition in a low thermal expansion coefficient glass fiber drawing furnace of the present invention;

[0051] Figure 17 The present invention is a cross-sectional view of a material channel in a low thermal expansion coefficient glass fiber drawing furnace.

[0052] Among them: 1. leakage box; 2. leakage nozzle; 21. drawing part; 22. guide part; 3. stabilizing plate; 301. liquid flow hole; 4. blind column; 5. furnace body; 501. melting chamber; 502. material channel; 503. rising flow channel; 504. feeding port; 505. discharge port; 506. mounting hole; 6. partition; 7. combustion gun; 8. molybdenum electrode; 9. thermocouple. DETAILED DESCRIPTION

[0053] The following will be combined with the specific embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0054] As an important industrial material, glass fiber is widely used in many fields, including construction, transportation, electronics, and aerospace. The glass fiber drawing furnace is the core equipment for glass fiber production, and its performance directly affects the quality, output, and production cost of glass fiber.

[0055] like Figure 1 As shown, a low thermal expansion coefficient glass fiber drawing furnace of the present invention includes a furnace body 5, a partition 6, a combustion gun 7, a molybdenum electrode 8, a thermocouple 9, a control device and a drawing bushing.

[0056] The furnace body 5 is the main structure of the low thermal expansion coefficient glass fiber drawing furnace, which is generally made of refractory materials. The inner layer of the furnace body 5 is usually high chrome bricks, and the outer layer is insulation bricks, which are used to contain the glass liquid and provide a stable high-temperature environment.

[0057] like Figure 1 As shown, a melting chamber 501, a material channel 502 and an ascending flow channel 503 are provided in the furnace body 5. The melting chamber 501 is arranged in a vertical direction, the material channel 502 is arranged in a horizontal direction, and the ascending flow channel 503 is arranged in an inclined shape. The material channel 502 is located above the bottom end of the melting chamber 501, and the two ends of the ascending flow channel 503 are respectively connected with the melting chamber 501 and the material channel 502; a feed port 504 is provided on the peripheral side of the furnace body 5, and the feed port 504 is connected with the upper end of the melting chamber 501; a mounting hole 506 is provided on the bottom side of the furnace body 5, and the mounting hole 506 is connected with the material channel 502, and the wire drawing leak plate is fixedly arranged in the mounting hole 506.

[0058] like Figure 1 As shown, raw glass enters the melting chamber 501 through the feed port 504 and gradually melts under the action of the combustion heating device. As the temperature rises, the various components in the raw glass undergo physical and chemical changes, forming a uniform glass liquid. Under the action of gravity, bubbles and impurities in the glass liquid gradually float up or sink, resulting in clarified glass liquid. As the glass liquid level rises, the clarified glass liquid flows through the rising flow channel 503 into the material channel 502, and then exits the furnace body 5 through the drawing bushing in the form of glass fibers.

[0059] A discharge port 505 is provided on the bottom side of the furnace body 5, and the discharge port 505 is connected to the lower end of the melting chamber 501. When the refractory bricks inside the furnace body 5 fall off, or when the formula of the glass liquid in the furnace body 5 needs to be replaced, the discharge port 505 is opened to discharge the refractory bricks or the glass liquid that needs to be replaced out of the furnace body 5; similarly, a discharge port should also be provided on the bottom side of the end of the material channel 502. When the wire drawing operation is unstable, the discharge port can be opened to discharge the defective glass liquid out of the furnace body 5.

[0060] The combustion gun 7 and the molybdenum electrode 8 are combustion heating devices of the glass fiber drawing furnace, which are used to provide a heat source for the furnace body 5. The combustion gun 7 uses the flame generated by the combustion of fuel as the heat source, and directly heats the glass raw materials through the flame, which has the advantages of low investment cost and simple operation. The combustion gun 7 is fixed on the side wall of the furnace body 5, and the output end of the combustion gun 7 is located above the material channel 502; the molybdenum electrode 8 uses electric energy to heat the glass liquid through the electrode, which has the advantages of precise temperature control, high thermal efficiency, and environmental protection. The molybdenum electrode 8 is fixed on the side wall of the furnace body 5, and the output end of the molybdenum electrode 8 is located in the melting chamber 501; this drawing furnace combines the advantages of flame furnace and electric melting furnace. On the basis of flame heating, it uses electrode auxiliary heating to ensure sufficient melting capacity and improve temperature control accuracy and thermal efficiency.

[0061] like Figure 17 As shown, in order to improve the heating uniformity of the glass liquid in the material channel 502, it is preferred to set multiple combustion guns 7 on the two opposite side walls of the material channel 502, and let the multiple combustion guns 7 be arranged alternately; similarly, as shown in FIG. Figure 1 As shown, a plurality of molybdenum electrodes 8 should also be provided in the melting chamber 501 and the ascending flow channel 503 , and the plurality of molybdenum electrodes 8 should be reasonably distributed and arranged.

[0062] In order to improve the processing efficiency of glass fiber, it is necessary to set multiple mounting holes 506 and multiple drawing bushings. The multiple mounting holes 506 and the multiple drawing bushings correspond one to one to achieve multi-station processing of glass fiber.

[0063] The length of the material channel 502 increases with the increase in the number of leak plates. In order to arrange the material channel 502 well and reduce the space it occupies, it is preferred to set the material channel 502 in a U-shape, etc.; the partition 6 is fixedly set above the material channel 502, and multiple partitions 6 are parallel and spaced apart. The combustion gun 7 is located in the middle position of the partition 6, and at least one combustion gun 7 is set between two adjacent partitions 6. The partition 6 is used to block the flame of the combustion gun 7, so that the spatial temperature in the material channel 502 is uniform and stable to ensure the processing quality of the glass fiber.

[0064] Correspondingly, the mounting hole 506 is located below between two adjacent partitions 6 .

[0065] Thermocouple 9 is an existing temperature sensor. There are multiple thermocouples 9, and multiple thermocouples 9 are fixed on the furnace body 5. Their output ends are respectively located in the melting chamber 501, the material channel 502 and the rising flow channel 503, and are used to monitor the temperature at different positions in the furnace body 5 in real time.

[0066] The control device adjusts the combustion and heating device based on the temperature within the furnace body 5 detected by the thermocouple 9. The control device is preferably a PLC controller. When the thermocouple 9 detects an abnormal temperature of the glass melt, it transmits the temperature signal to the PLC controller. The PLC controller adjusts the power of the molybdenum electrode 8 by adjusting the power of the transformer, thereby adjusting the temperature of the glass melt. At the same time, the fuel valve is used to control the flow rate of the oxygen supply pipe and the gas supply pipe of the combustion gun 7. The PLC controller adjusts the oxygen-fuel ratio of oxygen and natural gas in the combustion gun 7 by adjusting the flow rate of the fuel valve, thereby adjusting the temperature of the glass melt and ensuring that the temperature within the furnace body 5 meets the requirements.

[0067] The drawing clevis is a core component of the drawing furnace, directly impacting the quality and efficiency of glass fiber processing. It consists of a clevis box 1, a nozzle 2, a stabilizing plate 3, and a blind post 4. The clevis box 1 is fixed within the mounting hole 506. Molten glass within the furnace body 5 flows through the material channel 502 into the clevis box 1 and out through the nozzle 2. Under the influence of gravity and surface tension, the molten glass forms a continuous stream. Under the traction of the drawing machine, the molten glass stream is stretched into long, thin glass fibers.

[0068] like Figure 4 As shown, a through hole is opened on the bottom side of the leakage box 1, and the leakage nozzle 2 includes a drawing portion 21 and a guide portion 22. The drawing portion 21 passes through and is fixed in the through hole on the bottom side of the leakage box 1. The top side of the drawing portion 21 is flush with the bottom side of the leakage box 1. The guide portion 22 is integrally formed on the top side of the drawing portion 21, and the guide portion 22 is sealed and connected to the drawing portion 21 and is continuously arranged; as shown Figure 5 As shown, the bottom end of the guide portion 22 is circular and flush with the bottom side of the drain box 1, and the top end of the guide portion 22 is elliptical and inclined with the bottom side of the drain box 1.

[0069] The top of the guide portion 22 is an ellipse, the line segment formed by the two points on the ellipse that are farthest apart is the major axis, and the line segment formed by the two points on the ellipse that are closest to each other is the minor axis. Figure 5 As shown, the two endpoints of the long axis of the top of the guide portion 22 are point A and point B, and the two endpoints of the short axis of the top of the guide portion 22 are point C and point D. Point B is the lowest point of the top of the guide portion 22, and the corresponding point A is the highest point of the top of the guide portion 22, and points C and D are both in the middle position of the top of the guide portion 22.

[0070] like Figure 4 and Figure 5As shown, assuming that the distance between point A and the axis of the drawing portion 21 is a, the distance between point B and the axis of the drawing portion 21 is b, the length of line segment CD is c, the length of line segment AB is d, and the bottom radius of the guide portion 22 and the radius of the drawing portion 21 are both r.

[0071] In some embodiments, c<2r<d, meaning the width of the top of the guide portion 22 is less than the outer diameter of the drawing portion 21, while the length of the top of the guide portion 22 is greater than the outer diameter of the drawing portion 21. This structural design allows the top of the guide portion 22 to be slender, which not only prevents larger impurities or bubbles from entering the nozzle 2, thereby ensuring the processing quality of the glass fiber, but also ensures the cross-sectional area of the top of the guide portion 22, preventing a reduced cross-sectional area at the top of the guide portion 22 that would reduce the glass liquid's throughput rate, thereby ensuring glass fiber processing efficiency. Because the top of the guide portion 22 is elliptical, it can also guide bubbles or impurities in the glass liquid, allowing them to quickly escape from the top side of the guide portion 22.

[0072] In some embodiments, a<r<b, that is, the distance between point A and the center line of the drawing portion 21 is smaller than the radius of the bottom end of the guide portion 22, and the distance between point B and the center line of the drawing portion 21 is larger than the radius of the bottom end of the guide portion 22. Figure 4 As shown, the guide portion 22 at point B is protruded outward and extends out of the side of the drawing portion 21, while the guide portion 22 at point A is retracted inward; correspondingly, the distances between point C and point D and the axis of the drawing portion 21 are also smaller than the radius of the bottom end of the guide portion 22.

[0073] Improvements to the nozzle 2 can improve the processing efficiency of the nozzle 2 and the processing efficiency of the leak plate, as follows:

[0074] When processing the nozzle 2, the nozzle 2 is first fixed in the vertical direction, and then a point on the upper end of the nozzle 2 is pressed downward and away from the center line of the nozzle 2 by a downward pressing device, so that the nozzle 2 of the present invention can be directly formed without performing other processing operations; Figure 5 As shown, the pressing device presses down the point B position of the nozzle 2. The operation is simple and easy to implement. It does not increase the difficulty of processing the nozzle 2, and the processing cost of the nozzle 2 will not increase much.

[0075] The nozzle 2 is welded and fixed to the leakage box 1. When assembling the two, it is first necessary to open a corresponding through hole on the bottom side of the leakage box 1, then use a tool to fix the nozzle 2 in the leakage box 1, and finally weld the nozzle 2 and the leakage box 1. The operation is relatively complicated. Figure 4As shown, the present invention sets one side of the upper end of the leakage nozzle 2 as a protruding structure. When the leakage nozzle 2 is placed from the leakage box 1 into the through hole at the bottom of the leakage box 1, the protruding structure is used to abut against the bottom side of the leakage box 1 to achieve the positioning of the leakage nozzle 2 so that the two can be welded. The improvement of the shape of the leakage nozzle 2 of the present invention simplifies the assembly process of the leakage nozzle 2 and the leakage box 1, thereby also improving the processing efficiency of the leakage plate.

[0076] The bottom side of the leakage box 1 is in contact with the external environment, and its heat dissipation effect is obvious, resulting in a relatively low temperature of the glass liquid on the bottom side of the leakage box 1, which makes it easy for some crystals to precipitate in the glass liquid. For this reason, point B is located above the bottom side of the leakage box 1, that is, point B is spaced apart from the bottom side of the leakage box 1 to prevent crystals or impurities at the bottom of the leakage box 1 from flowing into the leakage nozzle 2, thereby ensuring the processing quality of the glass fiber.

[0077] The stabilizing plate 3 is detachably fixed in the leakage box 1. The density of the stabilizing plate 3 is greater than the density of the softened glass in the leakage box 1, so that the stabilizing plate 3 will not float on the glass liquid. The melting point of the stabilizing plate 3 is higher than the melting point of the leakage box 1, so that the stabilizing plate 3 will not melt due to heat; the specific heat capacity of the stabilizing plate 3 is greater than the specific heat capacity of the leakage box 1. When the stabilizing plate 3 absorbs or releases heat, its temperature change is smaller. Since the stabilizing plate 3 is in direct contact with the glass liquid in the leakage box 1, the temperature uniformity of the glass liquid in the leakage box 1 can be improved, thereby avoiding the glass liquid in the leakage box 1 from affecting the processing quality of the glass fiber due to excessive temperature difference.

[0078] The stabilizing plate 3 is preferably made of ceramic, concrete or other composite materials.

[0079] like Figure 6 and Figure 8 As shown, a flow hole 301 is provided in the stabilizing plate 3, and the glass liquid above the stabilizing plate 3 can flow to the bottom of the stabilizing plate 3 through the flow hole 301 to form glass fibers; in order to avoid impurities or bubbles in the glass liquid, a filter can be provided in the flow hole 301.

[0080] In the early stage of glass fiber processing, the glass liquid needs to quickly fill the leakage box 1. In the early stage of glass fiber processing, there will be gas between the stabilizing plate 3 and the bottom of the leakage box 1. For this reason, the projection of the flow hole 301 on the bottom side of the leakage box 1 and the projection of the top side of the guide part 22 on the bottom side of the leakage box 1 are set at intervals. When the glass liquid flows downward along the flow hole 301, it can first flow to the periphery of the guide part 22, and then flow evenly to the guide part 22, thereby avoiding the problem of discontinuity of the glass fiber.

[0081] The same flow hole 301 corresponds to multiple drain nozzles 2, and the multiple drain nozzles 2 corresponding to the same flow hole 301 are arranged in a circle around the center line of the flow hole 301, and point B is located on the side of the drain nozzle 2 close to another adjacent drain nozzle 2; in order to maintain the temperature uniformity in the drain box 1, the drain plate will be electrically heated during the glass fiber drawing process, such as Figure 7 As shown, the straight line where point A and point B on the left nozzle 2 are located intersects with the center line of the upper nozzle 2, so that the glass liquid flowing into the left guide part 22 can fully contact the part of the upper guide part 22 where no protruding structure is set, thereby effectively ensuring the temperature uniformity of the glass liquid. At the same time, multiple nozzles 2 are arranged in a circular array around the center line of the flow hole 301, and the protruding structures of multiple guide parts 22 are also arranged in a circular array around the center line of the flow hole 301, causing the glass liquid flowing down the flow hole 301 to swirl. This method not only speeds up the separation efficiency of impurities or bubbles from the top of the nozzle 2, but also speeds up the speed at which the glass liquid flows into the nozzle 2, thereby improving the processing efficiency of the glass fiber.

[0082] There are multiple groups of leak nozzles 2 and liquid flow holes 301, and the multiple groups of leak nozzles 2 correspond to the multiple groups of liquid flow holes 301 one by one; multiple leak nozzles 2 are arranged in each group of leak nozzles 2, and the multiple leak nozzles 2 in the same group are arranged in a circular array around the center line of the liquid flow hole 301, and point B is located on the leak nozzle 2 on the side close to another leak nozzle 2 in the same group and adjacent to it.

[0083] In order to avoid mutual influence between multiple groups of drain nozzles 2, the projection shapes of the top ends of two adjacent and different groups of guide parts 22 on the bottom side of the drain box 1 should be different, that is, the protruding structures on the side walls of two adjacent and different groups of guide parts 22 should be oriented in different directions.

[0084] In order to reduce the heat dissipation effect on the bottom side of the leakage box 1, the blind column 4 is fixedly arranged on the bottom side of the leakage box 1. The specific heat capacity of the blind column 4 is greater than the specific heat capacity of the leakage nozzle 2, which plays a role in heat preservation, thereby reducing the temperature change rate of the leakage box 1 and the glass liquid in the leakage box 1.

[0085] Since the multiple leak nozzles 2 in the same group are arranged in a circular array around the center line of the liquid hole 301, and the leak nozzle 2 is not set at the position below the liquid hole 301 on the leak box 1, the blind column 4 can be set at the position below the liquid hole 301 on the leak box 1, that is, the projection of the blind column 4 on the bottom side of the leak box 1 coincides with the projection of the liquid hole 301 on the bottom side of the leak box 1; at this time, the lower ends of the multiple leak nozzles 2 in the same group are arranged in a circular array around the center line of the liquid hole 301, that is, the multiple drawing parts 21 in the same group are arranged in a circular array around the center line of the liquid hole 301, so as to improve the temperature uniformity of the glass liquid in each drawing part 21.

[0086] Glass fiber can only be formed after the glass liquid is cooled. Therefore, the lower end of the blind column 4 is located above the lower end of the drawing part 21, and the outer diameter of the blind column 4 is equal to the outer diameter of the drawing part 21, so that the lower end of the drawing part 21 can be cooled quickly.

[0087] Taking the example of four nozzles 2 in each group of nozzles 2, the present invention provides three arrangements of multiple groups of nozzles 2, as follows:

[0088] The first arrangement of the leak nozzle 2 is as follows Figure 9 and Figure 10 As shown, multiple groups of nozzles 2 are arranged in a matrix, and the protruding structures on two adjacent nozzles 2 in two groups of nozzles 2 are oriented in opposite directions, so that the multiple groups of nozzles 2 are independent of each other to ensure the drawing quality of the glass fiber.

[0089] like Figure 10 As shown, this arrangement makes the intervals between the various drawing parts 21 larger, and the blind column 4 is set on the outer circle of the multiple drawing parts 21, and the blind column 4 is set in the middle of two adjacent drawing parts 21 located in the outer circle. At this time, the length of the blind column 4 can be appropriately lengthened, so as to play a role in protecting the multiple drawing parts 21 located in the inner circle, preventing the external flowing gas from blowing the drawing parts 21 located in the inner circle, and ensuring the processing uniformity of the glass fiber.

[0090] like Figure 10 As shown, a larger idle space is formed between the drawing parts 21 of the inner ring. The idle space can be used to install heating electrodes to improve the temperature uniformity of the glass liquid, which is suitable for glass fiber materials with higher requirements on temperature uniformity. The idle space can also be used to install cooling nozzles to speed up the cooling rate of the glass fiber and improve the processing efficiency of the glass fiber.

[0091] The second arrangement of the nozzle 2 is as follows Figure 11 and Figure 12 As shown, the multiple groups of nozzles 2 are arranged in two rows, and the multiple groups of nozzles 2 in each row are evenly distributed along a straight line. The two rows of nozzles 2 are arranged alternately. This arrangement can increase the number of nozzles 2 and take into account the independence of the nozzles 2. This arrangement can improve the processing efficiency of glass fiber.

[0092] like Figure 12 As shown, the blind column 4 is arranged on the outer ring of multiple drawing parts 21, and the blind column 4 is arranged in the middle of two adjacent drawing parts 21 on the outer ring to achieve the effect of balancing the temperature and protecting the inner ring leakage nozzle 2.

[0093] The third arrangement of the leak nozzle 2 is as follows Figure 13 and Figure 14As shown, multiple groups of nozzles 2 are arranged along a W path, and individual nozzles 2 located in the outer circle are deleted. This arrangement maximizes the number of nozzles 2 while maintaining the independence of the multiple groups of nozzles 2, which can significantly improve the processing efficiency of glass fiber. Figure 14 As shown, the blind columns 4 at this time can be filled in the positions corresponding to the liquid flow holes 301 on the drain box 1.

[0094] like Figure 13 As shown, the straight line where point A and point B on the same drain nozzle 2 are located forms an angle of 45 degrees with the length direction of the drain box 1. By arranging in this way, the number of drain nozzles 2 on the same arrangement area can be increased; in order to avoid the two adjacent drawing parts 21 being too close to each other and affecting the processing quality of the glass fiber, the heights of the bottom ends of the two adjacent drawing parts 21 can be made different.

[0095] The method for using a low thermal expansion coefficient glass fiber drawing furnace of the present invention is as follows:

[0096] A screw feeder is used to feed the glass fiber raw material into the furnace body 5 through the feed port 504. The control device uses a PLC controller to control the transformer power to heat the molybdenum electrode 8, and then melt the raw material into glass liquid. The glass liquid in the melting chamber 501 enters the material channel 502 through the ascending flow channel 503, and flows into the leakage box 1 through the material channel 502 for wire drawing operation.

[0097] Thermocouple 9 detects the temperature of the glass liquid and transmits the temperature signal to the PLC controller. The PLC controller adjusts the heating temperature of the molybdenum electrode 8 by adjusting the transformer power, and adjusts the flow rate of the fuel valve to adjust the oxygen-fuel ratio of the combustion gun 7 to achieve control of the glass liquid temperature.

[0098] 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 in the scope of protection of the present invention.

Claims

1. A low thermal expansion coefficient glass fiber drawing bushing, characterized by: It comprises a leakage box (1) and a leakage nozzle (2), wherein the leakage nozzle (2) comprises a drawing portion (21) and a guiding portion (22), wherein: The wire drawing portion (21) is fixed through the bottom side of the leakage box (1); the guide portion (22) is integrally formed on the top side of the wire drawing portion (21), and is sealed and connected thereto and is continuously arranged; the bottom end of the guide portion (22) is circular and flush with the bottom side of the leakage box (1), and the top end of the guide portion (22) is elliptical and inclined with the bottom side of the leakage box (1); The two endpoints of the long axis of the top of the guide portion (22) are point A and point B respectively, the two endpoints of the short axis of the top of the guide portion (22) are point C and point D respectively, and point B is the lowest point of the top of the guide portion (22); the diameter of the bottom end of the guide portion (22) is greater than the distance between point C and point D, and smaller than the distance between point A and point B; the radius of the bottom end of the guide portion (22) is greater than the distance between point A, point C and point D and the axis of the wire drawing portion (21), and smaller than the distance between point B and the axis of the wire drawing portion (21).

2. A glass fiber drawing bushing with low thermal expansion coefficient according to claim 1, characterized in that: It also includes a stabilizing plate (3), which is detachably fixed in the leak box (1), the density of the stabilizing plate (3) is greater than the density of the softened glass in the leak box (1), the melting point of the stabilizing plate (3) is higher than the melting point of the leak box (1), and the specific heat capacity of the stabilizing plate (3) is greater than the specific heat capacity of the leak box (1); A liquid flow hole (301) is provided in the stabilizing plate (3), and a projection of the liquid flow hole (301) on the inner bottom side of the leakage box (1) and a projection of the top side of the guide portion (22) on the inner bottom side of the leakage box (1) are spaced apart.

3. A low thermal expansion coefficient glass fiber drawing bushing according to claim 2, characterized in that: The leakage nozzles (2) and the liquid flow holes (301) are both provided in multiple groups, and the multiple groups of the leakage nozzles (2) correspond to the multiple groups of the liquid flow holes (301) one by one; each group of the leakage nozzles (2) is provided with multiple leakage nozzles (2), and the multiple leakage nozzles (2) in the same group are arranged in a circle around the center line of the liquid flow hole (301); Point B is located on the side of the drain nozzle (2) close to another drain nozzle (2) in the same group and adjacent to it.

4. A low thermal expansion coefficient glass fiber drawing bushing according to claim 3, characterized in that: The projection shapes of the top ends of two adjacent and different groups of the guide portions (22) on the inner bottom side of the drain box (1) are different.

5. The low thermal expansion coefficient glass fiber drawing bushing according to claim 3, characterized in that: It also includes a blind column (4), which is fixedly arranged on the bottom side of the leakage box (1), and the projection of the blind column (4) on the bottom side of the leakage box (1) coincides with the projection of the liquid flow hole (301) on the bottom side of the leakage box (1); the specific heat capacity of the blind column (4) is greater than the specific heat capacity of the leakage nozzle (2).

6. The low thermal expansion coefficient glass fiber drawing bushing according to claim 5, characterized in that: The lower end of the blind column (4) is located above the lower end of the wire drawing portion (21), and the outer diameter of the blind column (4) is equal to the outer diameter of the wire drawing portion (21).

7. The low thermal expansion coefficient glass fiber drawing bushing according to claim 1, characterized in that: Point B is located above the inner bottom side of the leakage box (1).

8. A low thermal expansion coefficient glass fiber drawing furnace, characterized by: It comprises a furnace body (5) and a glass fiber drawing bushing with a low thermal expansion coefficient as claimed in any one of claims 1 to 7, wherein: The furnace body (5) is provided with a melting chamber (501), a material channel (502) and an ascending flow channel (503), wherein the material channel (502) is located above the bottom end of the melting chamber (501), and both ends of the ascending flow channel (503) are respectively connected to the melting chamber (501) and the material channel (502); A feed port (504) is provided on the peripheral side of the furnace body (5), and a discharge port (505) is provided on the bottom side of the furnace body (5), wherein the feed port (504) and the discharge port (505) are respectively connected to the upper and lower ends of the melting chamber (501); A mounting hole (506) is provided on the bottom side of the furnace body (5), the mounting hole (506) is communicated with the material channel (502), and the leakage box (1) is fixedly arranged in the mounting hole (506).

9. The low thermal expansion coefficient glass fiber drawing furnace according to claim 8, characterized in that: It also includes a plurality of baffles (6) and a plurality of combustion guns (7), wherein: The partition (6) is fixedly arranged above the material channel (502), and a plurality of the partitions (6) are arranged in parallel and at intervals; The combustion gun (7) is fixed on the side wall of the furnace body (5), and its output end is located above the material channel (502). At least one combustion gun (7) is provided between two adjacent partitions (6); The mounting holes (506) and the drain boxes (1) are both provided in plurality and correspond one to one, and the mounting holes (506) are located below between two adjacent partitions (6).

10. The low thermal expansion coefficient glass fiber drawing furnace according to claim 9, characterized in that: It also includes a molybdenum electrode (8), a plurality of thermocouples (9) and a control device, wherein: The molybdenum electrode (8) is fixed through the side wall of the furnace body (5), and its output end is located in the melting chamber (501); The plurality of thermocouples (9) are all fixed through the furnace body (5), and their output ends are respectively located in the melting chamber (501), the material channel (502) and the ascending flow channel (503); The control device is used to adjust the oxygen-fuel ratio of the combustion gun (7) and the power of the molybdenum electrode (8).

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