Low thermal expansion coefficient glass fiber drawing sieve plate and kiln

Abstract

The application relates to the technical field of glass fiber processing, and discloses a low-thermal-expansion-coefficient glass fiber drawing leak plate and a kiln, which comprise a leak box and a leak nozzle, the leak nozzle comprises a drawing part and a guide part, the drawing part is fixed through the leak box at the bottom side, the guide part is integrally formed at the top side of the drawing part, is in sealed communication with the drawing part and is continuously arranged, the bottom end of the guide part is circular and is flush with the bottom side in the leak box, and the top end of the guide part is elliptical and is inclined to the bottom side in the leak box. The leak nozzle is provided with the drawing part and the guide part, the top end of the guide part is in the form of an inclined ellipse, and the local protrusion of the drawing part protrudes from the side wall of the drawing part, so that the protrusion structure can be used for positioning the leak nozzle and the leak box, the welding processing efficiency is improved, the top end of the guide part can be used for cutting and separating the bubbles or impurities in the glass liquid, and the processing quality of the glass fiber is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of glass fiber processing, and in particular to a low-thermal-expansion-coefficient glass fiber drawing sieve plate and kiln. BACKGROUND

[0002] With the rapid development of electronic printed circuit boards, the automotive field, the military, and aerospace technology, higher requirements are placed on the various performance indicators of glass fibers, and stricter control standards are also placed on production efficiency and energy consumption. At present, most glass fibers have a high thermal expansion coefficient, which limits their application in high-end fields.

[0003] In the production process of glass fibers, the drawing sieve plate and the kiln are core process equipment, and their performance directly affects the yield, quality, and production cost of glass fibers. At present, the glass fiber drawing sieve plate widely used in the market is mostly made of platinum or its alloy material, which utilizes its high-temperature stability and good corrosion resistance to ensure the continuous and stable production of glass fibers.

[0004] The drawing sieve plate is usually composed of a sieve box and a sieve nozzle. For example, the processing technology of a low-thermal-expansion-coefficient glass fiber drawing sieve plate disclosed in the patent with the publication number CN114770051B requires that the drawing sieve plate be first cut and prepared into a shaped sieve plate, a plurality of sieve holes are formed in the bottom of the shaped sieve plate, and a cylinder is then welded at the bottom of the sieve holes. However, the number of sieve nozzles that need to be welded on each sieve plate is large, and the small sieve nozzles are not easy to position, which reduces the processing efficiency of the sieve plate. At the same time, in the drawing process of glass fibers, there may be bubbles or hard materials that have not been completely softened in the softened glass liquid on the top side of the sieve plate, which causes the sieve nozzles to be blocked and other problems, affecting the processing quality of the glass fibers. SUMMARY

[0005] Therefore, the present application provides a low-thermal-expansion-coefficient glass fiber drawing sieve plate and kiln, which can reduce the risk of sieve nozzle blockage and ensure the processing quality of glass fibers.

[0006] The technical solution of the present application is as follows: On the one hand, the present application provides a low-thermal-expansion-coefficient glass fiber drawing sieve plate, which comprises a sieve box and a sieve nozzle, the sieve nozzle comprises a drawing part and a guide part, wherein,

[0007] The drawing part is fixedly penetrated through the bottom side of the sieve box; the guide part is integrally formed on the top side of the drawing part and is in sealed communication and continuous arrangement with the drawing part; the bottom end of the guide part is circular and flush with the bottom side in the sieve box, and the top end of the guide part is elliptical and inclined to the bottom side in the sieve box;

[0008] Two end points of the long axis of the top end of the guide part are point A and point B respectively, two end points 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 greater than the distance between point C and point D, and less than the distance between point A and point B; the radius of the bottom end of the guide part is greater than the distance between point A, point C, point D and the axis of the wire drawing part respectively, and less than the distance between point B and the axis of the wire drawing part.

[0009] On the basis of the above technical scheme, preferably, further comprising a stabilizing plate, the stabilizing plate is detachably fixed in the leakage box, the density of the stabilizing plate is greater than the density of the softened glass in the leakage box, the melting point of the stabilizing plate is higher than the melting point of the leakage box, and the specific heat capacity of the stabilizing plate is greater than the specific heat capacity of the leakage box.

[0010] The stabilizing plate is provided with a liquid flow hole, and the projection of the liquid flow hole on the bottom side of the leakage box is spaced apart from the projection of the top side of the guide part on the bottom side of the leakage box.

[0011] Further preferably, the leakage nozzle and the liquid flow hole are each provided with a plurality of groups, and the plurality of groups of leakage nozzles and the plurality of groups of liquid flow holes are one-to-one corresponding; each group of leakage nozzles is provided with a plurality of leakage nozzles, and the plurality of leakage nozzles in the same group are arranged circumferentially around the center line of the liquid flow hole.

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

[0013] Further preferably, the projections of the top ends of two adjacent and different groups of guide parts on the bottom side of the leakage box are not the same shape.

[0014] Further preferably, further comprising a blind column, the blind column 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] Further preferably, the lower end of the blind column is located above the lower end of the wire drawing part, and the outer diameter of the blind column is equal to the outer diameter of the wire drawing part.

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

[0017] In a second aspect, the application provides a low-thermal-expansion-coefficient glass fiber drawing furnace, comprising a furnace body and the above-mentioned glass fiber drawing leakage plate, wherein,

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

[0019] The furnace body is provided with a feeding port on the circumferential side, and a discharging port on the bottom side, which are respectively connected with the upper and lower ends of the melting cavity;

[0020] The bottom side of the furnace body is provided with mounting holes, which are connected with the material channel, and the leakage box is fixedly arranged in the mounting holes.

[0021] On the basis of the above technical scheme, preferably, it further comprises a plurality of partitions and a plurality of combustion guns, wherein,

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

[0023] The combustion guns are fixedly arranged through the sidewall of the furnace body, and the output ends thereof are located above the material channel, and at least one combustion gun is arranged between adjacent two partitions;

[0024] The mounting holes and the leakage boxes are both provided with a plurality of holes, which are one-to-one corresponding, and the mounting holes are located below adjacent two partitions.

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

[0026] The molybdenum electrode is fixedly arranged through the sidewall of the furnace body, and the output end thereof is located in the melting cavity;

[0027] A plurality of the thermocouples are fixedly arranged through the furnace body, and the output ends thereof are respectively located in the melting cavity, the material channel and the upward flow channel;

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

[0029] The low-thermal-expansion-coefficient glass fiber drawing leakage plate and the kiln have the following beneficial effects relative to the prior art:

[0030] (1) By setting the leakage nozzle to comprise a drawing part and a guide part, the top end of the guide part is in an inclined elliptical structure, and part of the drawing part protrudes from the sidewall of the drawing part, not only can the protruding structure be used for positioning the leakage nozzle and the leakage box to improve the welding processing efficiency, but also the top end of the guide part can be used for cutting and separating the bubbles or impurities in the glass liquid to ensure the processing quality of the glass fiber;

[0031] (2) through the setting of the stable plate, the multiple leakage nozzles are arranged in the circumferential array around the center line of the flow hole, and the convex structure of the guide part is close to the leakage nozzle adjacent to it and in the same group, which not only can make the glass liquid generate vortex flow, accelerate the drawing efficiency of the glass fiber, but also can improve the temperature uniformity of the glass liquid in the leakage box, further improve the processing quality of the glass fiber;

[0032] (3) through the setting of the blind column, not only the end of the leakage nozzle close to the leakage box can be heated to make the glass fiber uniformly cooled, but also the idle position at the bottom side of the leakage box can be filled to keep the stability of the leakage box;

[0033] (4) through the arrangement of multiple groups of leakage nozzles in different ways, the leakage plate can be adapted to different processing conditions, thereby improving the adaptability of the drawing leakage plate. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0035] Figure 1 is a sectional view of a low thermal expansion coefficient glass fiber drawing kiln of the present application;

[0036] Figure 2 is a perspective view of a low thermal expansion coefficient glass fiber drawing leakage plate of the present application;

[0037] Figure 3 is a perspective view of the guide part in a low thermal expansion coefficient glass fiber drawing leakage plate of the present application;

[0038] Figure 4 is a sectional view of the leakage nozzle in a low thermal expansion coefficient glass fiber drawing leakage plate of the present application;

[0039] Figure 5 is a perspective view of the leakage nozzle in a low thermal expansion coefficient glass fiber drawing leakage plate of the present application;

[0040] Figure 6 is a top view of the stable plate in a low thermal expansion coefficient glass fiber drawing leakage plate of the present application;

[0041] Figure 7 is a sectional view of the guide part in a low thermal expansion coefficient glass fiber drawing leakage plate of the present application;

[0042] Figure 8 is a sectional view of the leakage box in a low thermal expansion coefficient glass fiber drawing leakage plate of the present application;

[0043] Figure 9 The top view of the glass fiber drawing bushing of low thermal expansion coefficient according to the present application in the first nozzle arrangement mode;

[0044] Figure 10 The bottom view of the glass fiber drawing bushing of low thermal expansion coefficient according to the present application in the first nozzle arrangement mode;

[0045] Figure 11 The top view of the glass fiber drawing bushing of low thermal expansion coefficient according to the present application in the second nozzle arrangement mode;

[0046] Figure 12 The bottom view of the glass fiber drawing bushing of low thermal expansion coefficient according to the present application in the second nozzle arrangement mode;

[0047] Figure 13 The top view of the glass fiber drawing bushing of low thermal expansion coefficient according to the present application in the third nozzle arrangement mode;

[0048] Figure 14 The bottom view of the glass fiber drawing bushing of low thermal expansion coefficient according to the present application in the third nozzle arrangement mode;

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

[0050] Figure 16 The cross-sectional view of the partition plate in the glass fiber drawing furnace of low thermal expansion coefficient according to the present application;

[0051] Figure 17 The cross-sectional view of the material channel in the glass fiber drawing furnace of low thermal expansion coefficient according to the present application.

[0052] Wherein: 1, bushing; 2, nozzle; 21, drawing part; 22, guide part; 3, stabilizing plate; 301, liquid flow hole; 4, blind column; 5, furnace body; 501, melting cavity; 502, material channel; 503, upward flow channel; 504, feeding port; 505, discharging port; 506, mounting hole; 6, partition plate; 7, combustion gun; 8, molybdenum electrode; 9, thermocouple. DETAILED DESCRIPTION

[0053] The technical solutions in the present application will be described clearly and completely below in combination with the specific embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0054] Glass fiber is an important industrial material, which is widely used in many fields such as building, transportation, electronics, aerospace, etc. The glass fiber drawing furnace is the core equipment of glass fiber production, and its performance directly affects the quality, yield and production cost of glass fiber.

[0055] As shown in Figure 1 The low thermal expansion coefficient glass fiber drawing furnace of the present application comprises a furnace body 5, a partition plate 6, a combustion gun 7, a molybdenum electrode 8, a thermocouple 9, a control device and a drawing sieve plate.

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

[0057] As shown in Figure 1 The furnace body 5 is provided with a melting cavity 501, a material channel 502 and an upward flow channel 503. The melting cavity 501 is arranged in the vertical direction, the material channel 502 is arranged in the horizontal direction, and the upward flow channel 503 is arranged in the inclined state. The material channel 502 is located above the bottom end of the melting cavity 501, and the two ends of the upward flow channel 503 are respectively connected with the melting cavity 501 and the material channel 502. The furnace body 5 is provided with a feeding port 504 on the side, which is connected with the upper end of the melting cavity 501. The bottom side of the furnace body 5 is provided with a mounting hole 506, which is connected with the material channel 502, and the drawing sieve plate is fixedly arranged in the mounting hole 506.

[0058] As shown in Figure 1 The glass raw material enters the melting cavity 501 through the feeding port 504 and gradually melts under the action of the combustion heating device. With the increase of temperature, various components in the glass raw material undergo physical and chemical changes to form uniform glass liquid. Under the action of gravity, the bubbles and impurities in the glass liquid gradually float up or sink down, so that the clarified glass liquid is obtained. With the rise of the glass liquid level, the clarified glass liquid flows into the material channel 502 through the upward flow channel 503, and then is discharged from the furnace body 5 in the form of glass fiber through the drawing sieve plate.

[0059] The bottom side of the furnace body 5 is provided with a discharge port 505, which is in communication with the lower end of the melting cavity 501. When the refractory bricks inside the furnace body 5 fall off, or when the formula of the glass liquid inside 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, the bottom side of the end of the material channel 502 should also be provided with a discharge port. When the drawing operation is unstable, the discharge port can be opened to discharge the poor 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 heat sources for the furnace body 5. The combustion gun 7 uses the flame generated by fuel combustion as a heat source to directly heat the glass raw material, which has the advantages of low investment cost and simple operation. The combustion gun 7 is fixedly penetrated 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 accurate temperature control, high thermal efficiency, environmental protection, etc. The molybdenum electrode 8 is fixedly penetrated on the side wall of the furnace body 5, and the output end of the molybdenum electrode 8 is located in the melting cavity 501. The present drawing furnace combines the advantages of flame furnace and electric melting furnace. On the basis of flame heating, auxiliary heating is achieved through electrodes, which can not only ensure sufficient melting capacity, but also improve temperature control accuracy and thermal efficiency.

[0061] As shown in Figure 17 , in order to improve the heating uniformity of the glass liquid in the material channel 502, a plurality of combustion guns 7 are preferably arranged on the two opposite side walls of the material channel 502, and the plurality of combustion guns 7 are alternately arranged. Similarly, as shown in Figure 1 , a plurality of molybdenum electrodes 8 should also be arranged in the melting cavity 501 and the upward 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, a plurality of mounting holes 506 and a plurality of drawing leakages are needed. The plurality of mounting holes 506 and the plurality of drawing leakages are one-to-one corresponding, realizing multi-station processing of glass fiber.

[0063] The length of the material channel 502 increases with the increase of the number of leakages. In order to arrange the material channel 502 well and reduce the occupied space, the material channel 502 is preferably arranged in the shape of a Chinese character “ ”. The partition plates 6 are fixedly arranged above the material channel 502. The plurality of partition plates 6 are parallel and spaced apart. The combustion gun 7 is located at the middle position of the partition plate 6, and at least one combustion gun 7 is arranged between the adjacent two partition plates 6. The flame of the combustion gun 7 is blocked by the partition plate 6, so that the space temperature in the material channel 502 is uniform and stable, so as to ensure the processing quality of the glass fiber.

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

[0065] The thermocouples 9 are a kind of existing temperature sensors, and a plurality of thermocouples 9 are arranged, and the plurality of thermocouples 9 are all fixedly penetrated on the furnace body 5, and the output ends thereof are respectively located in the melting cavity 501, the material channel 502 and the upward flow channel 503, and are used for monitoring the temperature at different positions in the furnace body 5 in real time.

[0066] The control device adjusts the combustion heating device according to the temperature in the furnace body 5 detected by the thermocouples 9. The control device is preferably a PLC controller. When the thermocouples 9 detect that the temperature of the glass liquid is abnormal, the temperature signal is transmitted to the PLC controller, the PLC controller adjusts the power of the molybdenum electrode 8 by adjusting the power of the transformer, so as to adjust the temperature of the glass liquid. At the same time, the fuel valve is used for controlling the flow of the oxygen supply pipeline and the gas supply pipeline of the combustion gun 7, and the PLC controller adjusts the oxygen-gas ratio of the oxygen and the natural gas in the combustion gun 7 by adjusting the flow of the fuel valve, so as to adjust the temperature of the glass liquid, and make the temperature in the furnace body 5 meet the requirements.

[0067] The drawing-off sieve plate is a core component of the drawing-off kiln, and directly affects the processing quality and efficiency of the glass fiber. The drawing-off sieve plate comprises a sieve box 1, a sieve nozzle 2, a stabilizing plate 3 and a blind column 4. The sieve box 1 is fixedly arranged in the mounting hole 506. The glass liquid in the furnace body 5 enters the sieve box 1 through the material channel 502, and then flows out from the sieve nozzle 2. Under the action of gravity and surface tension, the glass liquid forms a continuous glass liquid flow, which is drawn into an elongated glass fiber under the traction of the drawing machine.

[0068] As shown in Figure 4 , the bottom side of the sieve box 1 is provided with a through hole, the sieve nozzle 2 comprises a drawing-off part 21 and a guide part 22, the drawing-off part 21 is fixedly penetrated in the through hole in the bottom side of the sieve box 1, and the top side of the drawing-off part 21 is flush with the bottom side in the sieve box 1, the guide part 22 is integrally formed on the top side of the drawing-off part 21, and the guide part 22 is sealingly communicated with and continuously arranged with the drawing-off part 21; as shown in Figure 5 , the bottom end of the guide part 22 is circular and flush with the bottom side in the sieve box 1, and the top end of the guide part 22 is elliptical and inclined to the bottom side in the sieve box 1.

[0069] The top end of the guide part 22 is elliptical, the line segment formed by the two points farthest apart on the elliptical is the major axis, and the line segment formed by the two points closest apart on the elliptical is the minor axis, as shown in Figure 5 , the two end points of the major axis of the top end of the guide part 22 are point A and point B respectively, the two end points of the minor axis of the top end of the guide part 22 are point C and point D respectively, and point B is the lowest point of the top end of the guide part 22, and point A is the highest point of the top end of the guide part 22, and points C and D are both intermediate positions of the top end of the guide part 22.

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

[0071] In some embodiments, c < 2r < d, that is, the width of the top end of the guide section 22 is smaller than the outer diameter of the drawing section 21, and the length of the top end of the guide section 22 is greater than the outer diameter of the drawing section 21. Through this structural design, the top end of the guide section 22 is elongated, which not only avoids the entry of impurities or bubbles with a large particle size into the bushing 2, thereby ensuring the processing quality of the glass fiber, but also ensures the cross-sectional area of the top end of the guide section 22, thereby avoiding a too small cross-sectional area of the top end of the guide section 22 that reduces the passing speed of the glass liquid and ensures the processing efficiency of the glass fiber. Since the top end of the guide section 22 is elliptical, the bubbles or impurities in the glass liquid can be guided to quickly separate from the top side of the guide section 22.

[0072] In some embodiments, a < r < b, that is, the distance between point A and the center line of the drawing section 21 is smaller than the radius of the bottom end of the guide section 22, and the distance between point B and the center line of the drawing section 21 is greater than the radius of the bottom end of the guide section 22, as shown in Figure 4 that is, the guide section 22 at the position of point B protrudes outward and extends beyond the side surface of the drawing section 21, and the guide section 22 at the position of point A is inwardly gathered; correspondingly, the distances between points C and D and the axis of the drawing section 21 are also both smaller than the radius of the bottom end of the guide section 22.

[0073] The improvement of the bushing 2 can improve the processing efficiency of the bushing 2 and the processing efficiency of the bushing plate, as follows:

[0074] In the processing of the bushing 2, first, the bushing 2 is fixed in the vertical direction, and then a point on the upper end of the bushing 2 is pressed in the direction away from the center line of the bushing 2 by using a pressing device, so that the bushing 2 of the present application can be directly formed without other processing operations; as shown in Figure 5 the point B position of the bushing 2 is pressed by the pressing device, which is simple to operate and easy to implement, without increasing the processing difficulty of the bushing 2, and the processing cost of the bushing 2 is also not increased much.

[0075] The bushing 2 is welded and fixed with the bushing box 1. When assembling the two, first, a corresponding through hole is formed on the bottom side of the bushing box 1, then the bushing 2 is fixed in the bushing box 1 by using a tool, and finally the bushing 2 and the bushing box 1 are welded and fixed, which is relatively complex, as shown in Figure 4As shown, the present application sets the one side of the upper end of the leakage nozzle 2 as a convex structure, and when the leakage nozzle 2 is put into the through hole at the bottom of the leakage box 1 from the leakage box 1, the convex structure is abutted with the inner bottom side of the leakage box 1, so that the positioning of the leakage nozzle 2 is realized, and the welding of the two is realized. The improvement of the shape of the leakage nozzle 2 simplifies the assembly process of the leakage nozzle 2 and the leakage box 1, and therefore the processing efficiency of the leakage plate is improved.

[0076] The bottom side of the leakage box 1 is in contact with the external environment, and the heat dissipation effect is obvious, so that the temperature of the glass liquid on the inner bottom side of the leakage box 1 is relatively low, so that some crystals are easily precipitated in the glass liquid. Therefore, the point B is located above the inner bottom side of the leakage box 1, that is, the point B is spaced apart from the inner bottom side of the leakage box 1, so as to avoid the crystals or impurities at the bottom of the leakage box 1 flowing into the leakage nozzle 2, thereby ensuring the processing quality of the glass fiber.

[0077] The stable plate 3 is detachably fixed in the leakage box 1, the density of the stable plate 3 is greater than the density of the softened glass in the leakage box 1, so that the stable plate 3 will not float on the glass liquid, the melting point of the stable plate 3 is higher than the melting point of the leakage box 1, so that the stable plate 3 will not be melted by heat; the specific heat capacity of the stable plate 3 is greater than the specific heat capacity of the leakage box 1, and when the stable plate 3 absorbs or releases heat, the temperature change is smaller. Since the stable 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, and the processing quality of the glass fiber can be affected by the glass liquid in the leakage box 1 due to the too large temperature difference.

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

[0079] As shown in Figure 6 and Figure 8 The stable plate 3 is provided with a liquid flow hole 301, and the glass liquid above the stable plate 3 can flow to the lower side of the stable plate 3 through the liquid flow hole 301 to form glass fiber; in order to avoid impurities or bubbles in the glass liquid, a filter screen can be arranged in the liquid flow hole 301.

[0080] In the initial stage of glass fiber processing, the glass liquid needs to be quickly filled in the leakage box 1, and in the initial stage of glass fiber processing, there will be gas between the stable plate 3 and the bottom of the leakage box 1. Therefore, the projection of the liquid flow hole 301 on the inner bottom side of the leakage box 1 is spaced apart from the projection of the guide portion 22 on the inner bottom side of the leakage box 1, and when the glass liquid flows downward along the liquid flow hole 301, it can first flow into the surrounding of the guide portion 22, and then uniformly flow to the guide portion 22, avoiding the problem of discontinuity of the glass fiber.

[0081] Multiple nozzles 2 correspond to the same flow hole 301, and the multiple nozzles 2 corresponding to the same flow hole 301 are arranged circumferentially around the center line of the flow hole 301. Point B is located on the side of the nozzle 2 closest to another nozzle 2 adjacent to it. In order to maintain the temperature uniformity inside the filter box 1, the filter plate is electrically heated during the glass fiber drawing process, such as... Figure 7 As shown, the straight line containing points A and B on the left nozzle 2 intersects the center line of the upper nozzle 2, allowing the molten glass flowing into the left guide 22 to fully contact the part of the upper guide 22 without protruding structures, thus effectively ensuring the temperature uniformity of the molten glass. At the same time, multiple nozzles 2 are arranged in a circumferential array around the center line of the flow hole 301, and the protruding structures of multiple guides 22 are also arranged in a circumferential array around the center line of the flow hole 301, causing the molten glass flowing down from the flow hole 301 to vortex. This method not only accelerates the separation efficiency of impurities or bubbles from the top of the nozzle 2, but also accelerates the speed at which the molten glass flows into the nozzle 2, thereby improving the processing efficiency of glass fiber.

[0082] Multiple sets of leak nozzles 2 and flow holes 301 are provided, with each set of leak nozzles 2 corresponding to a different set of flow holes 301. Each set of leak nozzles 2 contains multiple leak nozzles 2, and the multiple leak nozzles 2 in the same set are arranged in a circular array around the center line of the flow hole 301. Point B is located on the leak nozzle 2 on the side close to another leak nozzle 2 in the same set and adjacent to it.

[0083] To avoid mutual interference between multiple sets of leak nozzles 2, the projection shapes of the tops of two adjacent and different sets of guide parts 22 on the bottom side of the leak box 1 should be different, that is, the orientation of the protruding structures on the sidewalls of two adjacent and different sets of guide parts 22 should be different.

[0084] To reduce the heat dissipation impact on the bottom side of the condenser box 1, the blind post 4 is fixedly installed on the bottom side of the condenser box 1. The specific heat capacity of the blind post 4 is greater than that of the condenser nozzle 2, which plays a role in heat preservation, thereby reducing the rate of temperature change of the condenser box 1 and the molten glass inside the condenser box 1.

[0085] Since multiple nozzles 2 in the same group are arranged in a circumferential array around the center line of the liquid flow hole 301, and no nozzle 2 is set on the position below the liquid flow hole 301 on the condenser box 1, the blind post 4 can be set on the condenser box 1 below the liquid flow hole 301, that is, the projection of the blind post 4 on the bottom side of the condenser box 1 coincides with the projection of the liquid flow hole 301 on the bottom side of the condenser box 1; at this time, the lower ends of multiple nozzles 2 in the same group are arranged in a circumferential array around the center line of the liquid flow hole 301, that is, multiple drawing parts 21 in the same group are arranged in a circumferential array around the center line of the liquid flow hole 301, so as to improve the temperature uniformity of the glass liquid in each drawing part 21.

[0086] The glass liquid can form glass fiber after cooling, therefore, the lower end of the blind column 4 is located above the lower end of the drawing section 21, and the outer diameter of the blind column 4 is equal to the outer diameter of the drawing section 21, so that the lower end of the drawing section 21 can be rapidly cooled.

[0087] Taking the four leak nozzles 2 arranged in each group as an example, the application provides three arrangement modes of multiple groups of leak nozzles 2, as follows:

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

[0089] As shown in Figure 10 , this arrangement mode makes the spacing of each drawing section 21 larger, the blind column 4 is arranged at the outer circle of the multiple drawing sections 21, and the blind column 4 is arranged in the middle of the two adjacent drawing sections 21 at 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 sections 21 at the inner circle, avoiding the flowing gas outside blowing the drawing sections 21 at the inner circle, and ensuring the uniformity of the processing of the glass fiber.

[0090] As shown in Figure 10 , a larger idle space is formed between the drawing sections 21 at the inner circle, the idle space can be installed with a heating electrode to improve the temperature uniformity of the glass liquid, and is suitable for glass fiber materials with higher requirements for temperature uniformity, and the idle space can also be used to install a cooling nozzle to accelerate the cooling speed of the glass fiber and the processing efficiency of the glass fiber.

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

[0092] As shown in Figure 12 , the blind column 4 is arranged at the outer circle of the multiple drawing sections 21, and the blind column 4 is arranged in the middle of the two adjacent drawing sections 21 at the outer circle, to achieve the effect of balancing the temperature and protecting the inner circle leak nozzles 2.

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

[0094] As shown, the straight line where the points A and B on the same leakage nozzle 2 are located forms a 45-degree angle with the length direction of the leakage box 1, and this arrangement can increase the number of leakage nozzles 2 in the same arrangement area; in order to avoid the distance between the adjacent two drawing parts 21 being too close to affect the processing quality of the glass fibers, the heights of the bottom ends of the adjacent two drawing parts 21 can be different. Figure 13

[0095] The use method of the low-thermal-expansion-coefficient glass fiber drawing furnace of the present application is as follows:

[0096] The glass fiber raw material is fed into the furnace body 5 through the feeding port 504 by using the spiral feeder, the control device controls the transformer power by using the PLC controller to control the molybdenum electrode 8 to heat, and then the raw material is melted into glass liquid, the glass liquid in the melting cavity 501 enters the material channel 502 through the upward flow channel 503, and then flows into the leakage box 1 through the material channel 502 for drawing operation.

[0097] The 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 of the fuel valve to adjust the oxygen-fuel ratio of the combustion gun 7, so as to control the temperature of the glass liquid.

[0098] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.​

Claims

1. A low coefficient of thermal expansion glass fiber draw-off bushing characterized by: Including leakage box (1) and leakage mouth (2), the leakage mouth (2) includes drawing section (21) and guide section (22), wherein, The drawing section (21) is fixed through the bottom side of the leakage box (1);The guide section (22) is integrally formed on the top side of the drawing section (21), and is in sealed communication and continuous arrangement with it;The bottom end of the guide section (22) is circular, and is flush with the bottom side in the leakage box (1), and the top end of the guide section (22) is oval, and is inclined with the bottom side in the leakage box (1); The two end points of the long axis of the top end of the guide section (22) are point A and point B respectively, the two end points of the short axis of the top end of the guide section (22) are point C and point D respectively, and point B is the lowest point of the top end of the guide section (22);The diameter of the bottom end of the guide section (22) is greater than the distance between point C and point D, and less than the distance between point A and point B;The radius of the bottom end of the guide section (22) is greater than the distance between point A, point C and point D and the axis of the drawing section (21) respectively, and less than the distance between point B and the axis of the drawing section (21); Further comprising a stabilizing plate (3), the stabilizing plate (3) can be 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), the melting point of the stabilizing plate (3) is higher than the melting point of the leakage box (1), and the specific heat capacity of the stabilizing plate (3) is greater than the specific heat capacity of the leakage box (1);The stabilizing plate (3) is provided with a liquid flow hole (301), and the projection of the liquid flow hole (301) on the bottom side in the leakage box (1) is arranged in interval with the projection of the top side of the guide section (22) on the bottom side in the leakage box (1); The leakage mouth (2) and the liquid flow hole (301) are provided with multiple groups, and the multiple groups of leakage mouth (2) and the multiple groups of liquid flow hole (301) are one-to-one corresponding;Each group of leakage mouth (2) is provided with a plurality of leakage mouth (2), and the plurality of leakage mouth (2) in the same group is arranged around the center line of the liquid flow hole (301) in a circular manner;Point B is located on one side of the leakage mouth (2) close to another leakage mouth (2) in the same group and adjacent thereto.

2. A low coefficient of thermal expansion glass fiber drawing trough as claimed in claim 1, characterized in that: The projections of the top ends of the guide sections (22) of two adjacent and different groups on the bottom side in the leakage box (1) are not the same shape.

3. A low coefficient of thermal expansion glass fiber drawing trough as claimed in claim 1, wherein: Further comprising a blind column (4), the blind column (4) 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 mouth (2).

4. A low coefficient of thermal expansion glass fiber drawing trough as in claim 3, characterized in that: The lower end of the blind column (4) is located above the lower end of the drawing section (21), and the outer diameter of the blind column (4) is equal to the outer diameter of the drawing section (21).

5. A low coefficient of thermal expansion glass fiber drawing trough as claimed in claim 1, wherein: Point B is located above the bottom side in the leakage box (1).

6. A low coefficient of thermal expansion glass fiber draw furnace characterized by: Including furnace body (5) and low thermal expansion coefficient glass fiber drawing leakage plate as claimed in any one of claims 1-5, wherein, The furnace body (5) is internally provided with a melting cavity (501), a material channel (502) and an upward flow channel (503), the material channel (502) is located above the bottom end of the melting cavity (501), and the two ends of the upward flow channel (503) are respectively connected with the melting cavity (501) and the material channel (502); The furnace body (5) is provided with a feeding port (504) on the side, and a discharging port (505) is arranged on the bottom side of the furnace body (5), the feeding port (504) and the discharging port (505) are respectively connected with the upper and lower ends of the melting cavity (501); The bottom side of the furnace body (5) is provided with a mounting hole (506), the mounting hole (506) is connected with the material channel (502), and the leakage box (1) is fixedly arranged in the mounting hole (506).

7. A low coefficient of thermal expansion glass fiber draw furnace as claimed in claim 6 wherein: Further comprising a plurality of partitions (6) and a plurality of combustion guns (7), wherein, The partition (6) is fixedly arranged above the material channel (502), and a plurality of partitions (6) are arranged in parallel and at intervals; The combustion gun (7) is fixedly arranged on the side wall of the furnace body (5), and the output end is located above the material channel (502), and at least one combustion gun (7) is arranged between adjacent two partitions (6); The mounting hole (506) and the leakage box (1) are provided with a plurality of one-to-one correspondence, and the mounting hole (506) is located below the adjacent two partitions (6).

8. A low coefficient of thermal expansion glass fiber draw furnace as claimed in claim 7 wherein: Further comprising a molybdenum electrode (8), a plurality of thermocouples (9) and a control device, wherein, The molybdenum electrode (8) is fixedly arranged on the side wall of the furnace body (5), and the output end is located in the melting cavity (501); A plurality of thermocouples (9) are fixedly arranged on the furnace body (5), and the output ends are respectively located in the melting cavity (501), the material channel (502) and the upward flow channel (503); The control device is used for adjusting the oxygen-fuel ratio of the combustion gun (7) and the power of the molybdenum electrode (8).

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