Cooling device and glass fiber production equipment

Abstract

The invention discloses a cooling device and glass fiber production equipment, and relates to the technical field of glass fiber production, and the cooling device comprises a spray pipe, an air supply pipeline, a control valve and a control system. Wherein the spray pipe is provided with a plurality of air nozzles distributed at intervals along the longitudinal direction, the plurality of air nozzles are used for spraying air flow towards one side deviating from the bushing so as to form an air vortex capable of reducing the temperature of the bushing and the root of the glass fiber on one side deviating from the bushing of the spray pipe, and the air supply pipeline is connected with the spray pipe and is used for supplying the air flow to the spray pipe; the control valve is arranged on the air supply pipeline and used for controlling the flow of airflow in the air supply pipeline, and the control system is in communication connection with the control valve and used for controlling the opening degree of the control valve according to the wire drawing operation state. The cooling device can stabilize the temperature of the bushing plate when the wire drawing operation is interrupted or the machine head is switched, reduces the number of waste products, and meets the cooling requirement of the bushing plate with high hole number for producing small-diameter fibers, so that the productivity and the economic benefit of a wire drawing operation unit are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of glass fiber production, in particular to a cooling device and a glass fiber production equipment. BACKGROUND

[0002] In the glass fiber production process, the drawing operation is one of the key links.

[0003] Please refer to Figure 1 The current drawing operation unit usually adopts a semi-closed structure, which is open in the front to facilitate operation and inspection, the remaining three sides are enclosed by partitions 10 and wall panels, the top end is connected with the bottom plate 9 of the kiln drawing passage, and the lower end is connected with the floor 11, and an air extraction channel is arranged below the floor 11.

[0004] In the glass fiber 2 drawing process, the glass fiber 2 is drawn out from the bushing 1, preliminarily cooled by the fin cooler, coated with the wetting agent by the oil applicator 3, gathered into a fiber bundle on the buncher 4, reciprocally arranged by the wire arranging device 5, and finally wound into a yarn ball 7 (or a fiber ball) on the high-speed rotating drawing head 6 (including the main head 61 and the standby head 62, which are alternately switched). Maintaining the stable cooling of the bushing 1 and the fiber root is the key to ensuring the continuity of the drawing operation. During normal operation, the fiber root is preliminarily cooled by the fin cooler, further cooled in contact with the surrounding air during high-speed movement, and drives the surrounding air to flow downward, while the heat is discharged from the system through the air extraction channel. However, the existing cooling system generally has the following defects:

[0005] During the interruption of the drawing operation or the switching of the head, the fiber speed decreases significantly or slowly moves downward to overcome the internal viscous force of the glass liquid by gravity, the downward air flow is greatly weakened or even disappears, the air flowability near the bottom of the bushing 1 becomes poor, the temperature rises rapidly, the bottom of the bushing 1 cannot be normally cooled, and the temperature of the bushing 1 rises rapidly. The control system will automatically adjust the heating current, but the temperature of the bushing 1 fluctuates greatly, which affects the stability of the drawing operation and produces a large amount of waste products, which cumulatively has a greater impact on economic benefits. At the same time, the bushing 1 is prone to thermal expansion and contraction under repeated rapid temperature rise and fall and current impact, reducing the service life. In addition, with the intensification of market competition, enterprises try to increase the number of bushing 1 holes or increase the temperature of the bushing 1 to improve production capacity, but the existing cooling means cannot meet the cooling needs of the high-hole bushing 1 to produce more glass fibers per unit time, and the high temperature of the bushing 1 will reduce its service life and affect the production stability.

[0006] Therefore, there is a lack of an efficient cooling measure in the prior art to stabilize the bushing temperature during the interruption of the drawing operation or the switching of the head, reduce the number of waste products, and meet the cooling needs of the high-hole bushing to produce glass fibers, thereby improving the production capacity and economic benefits of the drawing operation unit. SUMMARY

[0007] The purpose of the present application is to provide a cooling device and a glass fiber production equipment, which can stabilize the temperature of the bushing during the interruption of the drawing operation or the switching of the bushing, reduce the amount of waste products, and meet the cooling needs of small-diameter fibers produced by high-hole-count bushings, thereby improving the productivity and economic benefits of the drawing operation unit.

[0008] To achieve the above purpose, the present application provides a cooling device for use in a glass fiber production equipment, the glass fiber production equipment comprising a bushing for drawing glass fibers, the cooling device comprising:

[0009] a nozzle provided with a plurality of air injection ports spaced along the longitudinal direction, the plurality of air injection ports being configured to inject air flow towards the side away from the bushing to form an air vortex on the side of the nozzle away from the bushing, which can reduce the temperature of the bushing and the root of the glass fibers;

[0010] a gas supply pipeline connected to the nozzle for supplying air flow to the nozzle;

[0011] a control valve provided in the gas supply pipeline for controlling the flow rate of the air flow in the gas supply pipeline;

[0012] a control system in communication with the control valve for controlling the opening degree of the control valve according to the state of the drawing operation.

[0013] In some embodiments, the cooling device further comprises a water-cooled support pipe for supporting the bushing, the water-cooled support pipe being connected to the nozzle, and the water-cooled support pipe being configured to reduce the temperature of the air flow in the nozzle by passing cooling liquid.

[0014] In some embodiments, the cooling device further comprises a liquid supply assembly connected to the water-cooled support pipe, the liquid supply assembly being in communication with the control system, and the liquid supply assembly being configured to pass different flow rates of cooling liquid into the water-cooled support pipe upon receiving different liquid supply signals from the control system.

[0015] In some embodiments, the control system comprises:

[0016] a flow regulation unit for generating corresponding flow instructions according to real-time cooling needs;

[0017] a metering liquid supply unit in communication with the flow regulation unit for controlling the liquid supply assembly to pass a corresponding amount of cooling liquid into the water-cooled support pipe according to the flow instructions in response to the flow instructions, so as to realize differential regulation of the amount of cooling liquid supplied.

[0018] In some embodiments, the water-cooled support pipe and the nozzle are arranged in a groove of the bushing, and a heat insulation layer is provided between the water-cooled support pipe, the nozzle and the bushing.

[0019] In some embodiments, the position of the nozzle is set to be flush with the lower surface of the bottom plate of the distributor to flush with the lower edge of the cooling fin.

[0020] In some embodiments, the nozzle is arranged to be positioned directly below the longitudinal axis of the bottom plate of the distributor, and the length of the nozzle is arranged to cover the longitudinal dimension of the distributor.

[0021] In some embodiments, the control system comprises:

[0022] a temperature sensor for monitoring the temperature of the bottom plate of the distributor in real time;

[0023] a speed sensor for detecting the pulling speed of the glass fiber;

[0024] a control module in communication with the temperature sensor and the speed sensor, and arranged to dynamically adjust the opening degree of the control valve according to the temperature of the bottom plate of the distributor and the pulling speed of the glass fiber, so as to increase the flow rate of the air flow from the plurality of air outlets to 110-130% of the normal state when the drawing process is interrupted, and to increase the flow rate of the air flow from the plurality of air outlets to 105-115% of the normal state when the head is switched.

[0025] In some embodiments, the control system further comprises a drawing operation state detection module arranged to detect whether the drawing operation is interrupted or the head is switched, and to control the opening degree of the control valve according to the detection result.

[0026] The present application also provides a glass fiber production equipment comprising a distributor, and further comprising a cooling device for cooling the distributor and the root of the glass fiber, such as any one of the above cooling devices.

[0027] With respect to the background art described above, the cooling device provided by the embodiments of the present application is used in a glass fiber production equipment comprising a distributor for drawing the glass fiber, and the cooling device comprises a nozzle, a gas supply pipeline, a control valve and a control system. The nozzle is provided with a plurality of air outlets distributed at intervals along the longitudinal direction, and the plurality of air outlets are arranged to spray air flow towards the side away from the distributor, so as to form an air vortex on the side of the nozzle away from the distributor, which can reduce the temperature of the distributor and the root of the glass fiber. The gas supply pipeline is connected to the nozzle, and is arranged to supply air flow to the nozzle. The control valve is arranged in the gas supply pipeline, and is arranged to control the flow rate of the air flow in the gas supply pipeline. The control system is in communication with the control valve, and is arranged to control the opening degree of the control valve according to the state of the drawing operation.

[0028] The cooling device works, high-speed air flow is sprayed from the air outlet of the nozzle towards the side away from the bushing, a high-speed air flow band is formed on the side of the nozzle away from the bushing, the surrounding air is driven to move quickly towards the side away from the bushing, thereby generating a negative pressure area on the adjacent area on both sides of the high-speed air flow band, the negative pressure area absorbs air from the adjacent area outside the negative pressure area, and the cycle is repeated to form an air vortex, the air vortex absorbs the surrounding low-temperature air, flows through the bushing and the root of the glass fiber, reduces the temperature of the bushing and the root of the glass fiber, and then is discharged from the air extraction channel to take out a large amount of heat from the fiber drawing operation unit.

[0029] In this way, when the fiber drawing operation is interrupted or the head is switched, the cooling device can quickly restore the air flow to the normal intensity when the air flow generated by the downward movement of the glass fiber disappears or is greatly weakened, and quickly restore the cooling level of the bottom plate of the bushing, the bushing nozzle and the root of the glass fiber to the normal state, thereby greatly reducing the fluctuation range of the temperature of the bushing and the heating current, significantly reducing the number of waste products, and prolonging the service life of the bushing to a certain extent. More importantly, the cooling device can additionally form a strong air vortex under normal operation to suck in the surrounding cold air to strengthen the cooling of the bottom plate of the bushing, the bushing nozzle and the root of the glass fiber, thereby greatly improving the cooling capacity of the fiber drawing operation unit. In combination with the increased temperature of the bushing, the production capacity of the fiber drawing operation unit can be increased by 10% to 20%, and the fiber drawing operation can be kept stable for a long time. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the embodiments or related art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0031] Figure 1 It is a front view of the glass fiber production equipment in the prior art.

[0032] Figure 2 It is a working principle diagram of the cooling device applied to the glass fiber production equipment in an embodiment of the present application.

[0033] Figure 3 It is a Figure 1 It is a connection diagram of the nozzle and the water-cooled supporting pipe in the cooling device.

[0034] Figure 4 It is a Figure 3 It is a bottom view of the cooling device.

[0035] Figure 5 It is a Figure 3 It is a middle cross-sectional view of the cooling device.

[0036] Figure 6 for Figure 4 A magnified view of the middle section.

[0037] Figure 7 This is a schematic diagram of the assembly of the cooling device in another embodiment of this application.

[0038] Figure 8 for Figure 7 A bottom view of a nozzle after assembly.

[0039] Figure 9 for Figure 7 Another bottom view of the nozzle assembly.

[0040] in:

[0041] 1-Squeezing plate, 1001-Base plate, 1002-Squeezing nozzle, 2-Glass fiber, 3-Oil applicator, 4-Bubbling device, 5-Wire guide, 6-Drawing head, 61-Main head, 62-Spare head, 7-Yarn bundle, 8-Cooling air box, 9-Drawing passage base plate, 10-Baffle plate, 11-Floor, 12-Nozzle, 1201-Air nozzle, 13-Heat insulation layer, 14-Cooler, 1401-Cooler body, 1402-Cooling fins, 1403-Inlet and outlet water pipes, 15-Squeezing plate casting material, 16-Squeezing plate frame, 17-Water-cooled support. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] It should be noted that the directional terms such as "upper end," "lower end," "left side," and "right side" mentioned below are defined based on the accompanying drawings in the instruction manual.

[0045] Please refer to this as well. Figures 2 to 9 , Figure 2 This is a schematic diagram illustrating the working principle of a cooling device applied to a glass fiber production equipment in one embodiment of this application. Figure 3 for Figure 1 The diagram shows the connection between the nozzle and the water-cooled support tube in the cooling device. Figure 4 for Figure 3 A bottom view. Figure 5 for Figure 3 A schematic diagram of the middle cross section.Figure 6 is a middle enlarged schematic view of Figure 4 Figure 7 is an assembly schematic view of the cooling device in another embodiment of the present application. Figure 8 is a middle enlarged schematic view of Figure 7 is an assembled bottom view of a nozzle of Figure 9 is an assembled bottom view of a nozzle of Figure 7 is an assembled bottom view of a nozzle of

[0046] The cooling device provided by the embodiments of the present application is used in a glass fiber production device, the glass fiber production device comprises a bushing 1 for drawing out glass fibers 2, and the cooling device comprises a nozzle 12, a gas supply pipeline, a control valve and a control system.

[0047] The nozzle 12 is provided with a plurality of air outlets 1201 distributed along the longitudinal direction, and the plurality of air outlets 1201 are used to spray air flow to the side away from the bushing 1, so as to form an air vortex capable of reducing the temperature of the bushing 1 and the root of the glass fibers 2 on the side of the nozzle 12 away from the bushing 1.

[0048] The gas supply pipeline is connected to the nozzle 12, and is used to supply air flow to the nozzle 12. The control valve is arranged on the gas supply pipeline, and is used to control the flow of the air flow in the gas supply pipeline. The control system is in communication connection with the control valve, and is used to control the opening degree of the control valve according to the drawing work state.

[0049] Specifically, the gas supply pipeline is connected to one end or both ends of the nozzle 12 (if the gas supply pipeline is connected to only one end of the nozzle 12, the other end of the nozzle 12 is closed). A control valve capable of adjusting the flow according to the setting and connected to and controlled by the drawing work system is arranged on the gas supply pipeline. The air inlet end of the control valve is connected to a clean high-pressure air source through a pipeline.

[0050] When the cooling device works, high-speed air flow is sprayed from the air outlets 1201 of the nozzle 12 to the side away from the bushing 1, and a high-speed air flow belt similar to a plate is formed on the side of the nozzle 12 away from the bushing 1, which drives the surrounding air to move rapidly to the side away from the bushing 1, so as to generate a negative pressure area in the adjacent area on both sides of the high-speed air flow belt. The negative pressure area absorbs air from the adjacent area outside the negative pressure area, and the cycle is formed, so as to form an air vortex. The air vortex absorbs surrounding low-temperature air, flows through the root of the bushing 1 and the glass fibers 2, reduces the temperature, and then is discharged from the air extraction channel, so as to take out a large amount of heat from the drawing work unit.

[0051] ​In this way, when the drawing operation is interrupted or the head is changed, the cooling device can quickly restore the air flow to the normal intensity when the air flow generated by the downward movement of the glass fiber 2 disappears or is greatly weakened, quickly restore the cooling level of the bottom plate 1001 of the bushing 1, the bushing nozzle 1002 and the root of the glass fiber 2 to the normal state, thereby greatly reducing the fluctuation range of the temperature and heating current of the bushing 1, significantly reducing the number of waste products, and prolonging the service life of the bushing 1 to some extent. More importantly, the cooling device can additionally form a strong air vortex in the normal operation state to suck in the surrounding cold air to strengthen the cooling of the bottom plate 1001 of the bushing 1, the bushing nozzle 1002 and the root of the glass fiber 2, thereby greatly improving the cooling capacity of the drawing operation unit. In combination with the increased temperature of the bushing 1, the production capacity of the drawing operation unit can be increased by 10% to 20%, and the drawing operation can be kept stable for a long time.

[0052] For example, the air injection port 1201 can be a small hole or a slit uniformly distributed along the axis direction of the injection pipe 12. The injection pipe 12 is located directly below the longitudinal axis of the bottom plate 1001 of the bushing 1 and is parallel to the longitudinal axis of the bushing 1. The injection pipe 12 is provided with dense small holes or strip-shaped slits on the lower side. The distribution length of the small holes or slits is slightly larger than the length of the bottom plate 1001 of the bushing 1.

[0053] The injection pipe 12 is used to be arranged directly below the longitudinal axis of the bottom plate 1001 of the bushing 1, and the length of the injection pipe 12 is used to cover the size of the bushing 1 in the longitudinal direction, so that the distribution length of the small holes or slits on the lower side of the injection pipe 12 is slightly larger than the length of the bottom plate 1001 of the bushing 1. In this way, the bottom plate 1001 of the bushing 1 can be cooled to the maximum extent.

[0054] The injection pipe 12 is insulated from the bottom plate 1001 of the bushing 1 by a heat-insulating and insulating refractory material. The portions of the injection pipe 12 without small holes or strip-shaped slits at both ends are cast together with the bushing 1 through the bushing casting material 15 when the bushing 1 is cast, and are fixed on the bushing frame 16 through a fastening device.

[0055] The cooling device further comprises a cooler 14. The cooler 14 is located below the bushing 1 and is arranged on both sides of the injection pipe 12 in the transverse direction. The cooler 14 comprises a cooler body 1401 and cooling fins 1402.

[0056] The cooler body 1401 realizes water cooling circulation through the inlet and outlet water pipes 1403. The cooling fins 1402 are arranged on the cooler body 1401. The cooling fins 1402 are used to assist the heat dissipation of the bushing 1.

[0057] In this way, when the air carrying heat flows through the cooling fins 1402, the heat is taken away by the circulating water of the cooler body 1401, further improving the cooling effect of the bushing 1.

[0058] Furthermore, the cooling fins 1402 in this embodiment employ an enhanced heat dissipation design: a dual-gradient fin layout. Specifically, in the area near the sprue plate 1 (at least 50 mm from the sprue plate 1), high-density serrated fins (10-15 mm spacing, 45° tilt angle) are used to accelerate airflow turbulence and enhance the absorption of radiant heat from the roots of the glass fibers 2 at that location; in the area far from the sprue plate 1 (greater than 50 mm from the sprue plate 1), corrugated fins (20-25 mm spacing, 20° tilt angle) are configured to maintain airflow stability and reduce pressure loss.

[0059] Furthermore, the cooling water flow rate of cooler 14 is also set to adaptively control according to the wire drawing conditions. Specifically, during normal wire drawing: the cooling water flow rate is adjusted according to the PID control of the temperature of the sprue 1, and the target temperature fluctuation is less than or equal to ±5℃. When wire drawing is interrupted / switched, the pulse cooling mode is activated: the solenoid valve (used to control the water flow rate into cooler 14) is switched at a frequency of 3Hz, so that the airflow vortex intensity on the fin surface is maintained at more than 70% of the normal state, and the water flow rate is increased to 130% to compensate for the heat accumulation caused by the disappearance of airflow.

[0060] With this configuration, the cooler 14 is designed to significantly solve the cooling problem of the high-hole-count baffle plate 1 (generally greater than or equal to 4000 holes) through a dual-gradient fin enhanced heat dissipation and dynamic pulse cooling strategy.

[0061] In some embodiments, the nozzle 12 is positioned such that the plurality of air nozzles 1201 are flush with the lower surface of the bottom plate 1001 of the sprue plate 1 to the lower edge of the plurality of air nozzles 1201 being flush with the lower edge of the cooling fins 1402.

[0062] It should be noted that the closer the small hole or slit of the nozzle 12 is to the lower surface of the base plate 1001, the better the cooling effect of the air vortex formed on the cooling fins 1402, the root of the glass fiber 2, the nozzle 1002, and the base plate 1001.

[0063] like Figure 2 As shown, when the device is working, a high-speed airflow is ejected downwards from the small hole or slit of the nozzle 12, forming an approximately plate-shaped high-speed airflow band directly below the longitudinal axis of the sprue plate 1. This high-speed airflow band drives the surrounding air downwards rapidly, thereby creating a negative pressure zone in the adjacent areas on both sides of the high-speed airflow band. This negative pressure zone then absorbs air from the adjacent areas on its outer side, and so on, forming a cycle like... Figure 2 The ring-shaped air vortex, indicated by the dotted arrow, absorbs the surrounding low-temperature air, especially the cold air blown out by the cooling box, and flows through the cooling fins 1402, the nozzle 1002, the base plate 1001, and the root of the glass fiber 2, reducing their temperature. Then, it is discharged downwards from the exhaust duct, carrying a large amount of heat out of the drawing unit.

[0064] It should be noted that the higher the speed and the greater the flow rate of the air flow sprayed downward from the small holes or slits of the nozzle 12, the stronger the air vortex formed, the better the cooling effect on the cooling fins 1402, the bushing 1002, the bottom plate 1001 and the root of the glass fiber 2, and the more heat that can be taken away from the fiberizing unit.

[0065] It can be understood that in the normal fiberizing operation state, the air vortex is in the same direction as the air flow generated by the downward high-speed movement of the glass fiber 2, and is superimposed together to enhance the latter, greatly improving the cooling capacity of the fiberizing operation unit, so that the temperature of the bushing 1 can be increased more or the number of holes of the bushing 1 can be increased to greatly increase the flow of glass liquid through the bushing 1 while maintaining stable operation, achieving the purpose of greatly improving the capacity of the fiberizing operation unit (which can increase the capacity of the fiberizing operation unit by 10%-20%). When the fiberizing operation is interrupted and the head stops rotating, or the operation of the two heads is switched at a greatly reduced speed, the fiberizing operation system gives a signal to drive the control valve to control the nozzle 12 to spray more and faster high-speed air flow, thereby forming a stronger air vortex to restore the overall strength of the air flow to the normal fiberizing operation state, so that the temperature and heating current of the bushing 1 remain stable without significant fluctuations, reducing the number of waste products generated during this period, and improving the product yield (increasing the product yield by more than 2%).

[0066] Of course, in the normal fiberizing operation state, if other cooling means can meet the demand for increasing capacity, the air flow sprayed by the nozzle 12 can be reduced or turned off by the fiberizing operation system, but it is best not to be completely turned off.

[0067] In some embodiments, the cooling device further comprises a water-cooled support pipe 17 for supporting the bushing 1, the water-cooled support pipe 17 being connected to the nozzle 12, and the water-cooled support pipe 17 being configured to reduce the temperature of the air flow in the nozzle 12 by passing cooling liquid.

[0068] As can be seen, in addition to having the function of supporting the bushing 1, the water-cooled support pipe 17 also has the function of reducing the temperature of the air flow in the nozzle 12.

[0069] In this way, by directly connecting the water-cooled support pipe 17 to the nozzle 12 (such as by welding them together), passing cooling liquid (such as 15-25°C deionized water) can pre-reduce the temperature of the air flow in the nozzle 12. When the low-temperature air flow (10-15°C lower than the ambient air flow) blows to the bushing 1, the heat exchange efficiency is improved by 30%-40%, especially in the case of high-hole-count bushings 1 (more than or equal to 4000 holes), the temperature gradient in the root area of the bushing 1 is more gentle, and the diameter fluctuation of the glass fiber 2 can be reduced.

[0070] Meanwhile, as the load-bearing structure of the bushing 1, the water-cooled support pipe 17 can also be internally provided with micro flow channels (sawtooth flow channels or parallel flat tubes), which directly absorb the conduction heat of the spray pipe 12 when the cooling liquid flows through.

[0071] In some embodiments, the cooling device further comprises a liquid supply assembly connected with the water-cooled support pipe 17, the liquid supply assembly being in communication with the control system and being configured to pass different flow rates of cooling liquid into the water-cooled support pipe 17 upon receiving different liquid supply signals from the control system.

[0072] In this way, the liquid supply assembly is linked with the control system, and when the detection of the interruption of wire drawing or the switching of the head is detected, the liquid supply signal is triggered immediately to increase the flow rate of the cooling liquid to compensate for the heat accumulation caused by the disappearance of the airflow. This setting can press the temperature rise of the bushing 1 within the set temperature range.

[0073] Specifically, the control system comprises a flow rate adjusting unit and a metering liquid supply unit. The flow rate adjusting unit is configured to generate corresponding flow rate instructions according to real-time cooling requirements. The metering liquid supply unit is in communication with the flow rate adjusting unit and is configured to control the liquid supply assembly to pass a corresponding amount of cooling liquid into the water-cooled support pipe according to the flow rate instructions to realize the differential adjustment of the amount of cooling liquid supply.

[0074] In this way, on the one hand, the system immediately triggers high-flow cooling liquid compensation at the moment of interruption of wire drawing or switching of the head to eliminate the heat accumulation caused by the disappearance of the airflow, press the temperature rise of the bushing within the set threshold, and guarantee the stability of the continuous wire drawing process. On the other hand, the flow rate adjusting unit calculates the cooling requirements in real time (such as based on the feedback of the bushing temperature sensor or the wire drawing speed signal), and the metering liquid supply unit outputs differential flow rate with high precision. Compared with the traditional fixed flow rate mode, 30%-50% of the waste of cooling liquid can be reduced, and the operating energy consumption can be reduced.

[0075] In some embodiments, the water-cooled support pipe 17 and the spray pipe 12 are arranged in the groove of the bushing 1, and a heat insulation layer 13 is arranged between the water-cooled support pipe 17 and the spray pipe 12 and the bushing 1.

[0076] It should be noted that the spray pipe 12 is usually applied to a double-bottom bushing 1, and such a bushing 1 is provided with a groove along the length direction axis in the middle to arrange a reinforcing bottom plate 1001, and a water-cooled support pipe 17 is arranged in the groove to prevent the bottom plate 1001 of the bushing 1 from being deformed too much under high temperature. At the same time, a heat-insulating refractory material is filled between the water-cooled support pipe 17 and the bottom plate 1001, which can prevent the heat on the bottom plate 1001 from being conducted to the water-cooled support pipe 17 and the spray pipe 12 to affect the supporting effect of the spray pipe 12 on the bushing 1.

[0077] For the convenience of installation and fixation, the spout 12 is usually welded with the water-cooling supporting pipe 17, of course, other rigid connection ways can also be adopted to combine the two together.

[0078] The following will specifically explain the specific application examples of the bushing 1, the spout 12 and the water-cooling supporting pipe 17:

[0079] The bushing 1 adopts a double-bottom platinum bushing 1, the number of holes of the bushing 1 is 4000, a groove for strengthening is arranged at the middle position of the bottom of the bushing 1 along the length direction, the bottom plate 1001 of the bushing 1 is divided into two substantially symmetrical parts by the groove, and is cooled by cooperating with the water-cooling fin.

[0080] The spout 12 adopts a heat-resistant stainless steel pipe with an outer diameter of 8 mm and an inner diameter of 6 mm, 1 mm wide strip-shaped slits are processed at the lower part, each slit is 30 mm long, the slit spacing is 31.5 mm, the slit distribution length is 502.5 mm, the spout 12 is connected with a high-temperature resistant gas supply hose at both ends, an electromagnetic valve is adopted to control the gas flow, the electromagnetic valve is set by the wire drawing machine under various working conditions to control the flow, and clean compressed air is adopted as the working medium of the spout 12.

[0081] The water-cooling supporting pipe 17 is a flat round heat-resistant stainless steel pipe with a thickness of 8 mm and a width of 16 mm, the wall thickness is 1 mm, the water-cooling supporting pipe 17 is welded with the spout 12, and the spout 12 is located directly below the water-cooling supporting pipe 17.

[0082] The height position of the gas jetting slit of the spout 12 is set at a position substantially flush with the top of the bushing nozzle 1002.

[0083] Of course, the forced cooling device described in the embodiment can also be used alone without the water-cooling supporting pipe 17, especially on the bushing 1 without the groove (as shown in the Figure 2

[0084] Under the normal wire drawing operation state, the initial speed of the gas flow jetted from the slit of the spout 12 is controlled to be between 20 m / s and 60 m / s, and the flow is about 0.9 L / s to 3.5 L / s. In this case, after the spout 12 is adopted, about 20% of the heat can be additionally taken away on the basis of the original cooling system, and the cooling load of the water-cooling fin can be greatly reduced.

[0085] On this basis, under the premise of keeping the wire drawing operation stable, the working temperature of the bushing 1 can be increased by 10-16 ℃, so that the flow of the bushing 1 can be increased by 300-450 kg per day, and the effect of increasing the yield by 15-20% can be achieved.

[0086] In some embodiments, the control system includes a temperature sensor, a speed sensor, and a control module.

[0087] ​The temperature sensor is used to monitor the temperature of the bottom plate 1001 of the bushing 1 in real time, and the speed sensor is used to detect the pulling speed of the glass fiber 2. The control module is connected in communication with the temperature sensor and the speed sensor. The control module is used to dynamically adjust the opening degree of the control valve according to the temperature of the bottom plate 1001 of the bushing 1 and the pulling speed of the glass fiber 2, so as to increase the airflow flow rate of the plurality of air injection ports 1201 to 110%-130% of the normal state when the drawing is interrupted, and increase the airflow flow rate of the plurality of air injection ports 1201 to 105%-115% of the normal state when the head switches.

[0088] For example, when the drawing operation is interrupted and the head stops rotating, the control module gives a signal to drive the control valve, so that the gas injection flow rate of the nozzle 12 is increased by about 20% compared with the normal drawing operation state, the overall intensity of the airflow is restored to the normal drawing operation state, so that the temperature and heating current of the bushing 1 are kept stable without obvious fluctuation, the number of waste products generated during this period is reduced, and the product yield is increased by more than 2%. When the two heads in the operation are switched at a greatly reduced speed, the control module gives a signal to drive the control valve, so that the gas injection flow rate of the nozzle 12 is increased by about 10% compared with the normal drawing operation state, the overall intensity of the airflow is restored to the normal drawing operation state, so that the temperature and heating current of the bushing 1 are kept stable without obvious fluctuation.

[0089] If the normal drawing operation state does not require enhanced cooling, the gas injection flow rate of the nozzle 12 can be reduced or the air injection can be turned off, but it is preferred that only the gas injection flow rate of the nozzle 12 is reduced instead of being completely turned off.

[0090] In some embodiments, the control system further comprises a drawing operation state detection module, which is used to detect whether the drawing operation is interrupted or the head is switched, and control the opening degree of the control valve according to the detection result.

[0091] It should be emphasized that when the drawing is interrupted or the head is switched, the fiber movement speed suddenly decreases, the natural airflow is weakened or disappears, and the temperature of the bottom plate 1001 of the bushing 1 rapidly rises. The present application can identify the change of the operation state in real time through the state detection module (the state detection module can be set as a visual detection module), and trigger the control system to instantaneously increase the opening degree of the control valve, which has at least the following beneficial effects:

[0092] Firstly, when the drawing is interrupted or the head is switched, artificial vortex is forced to form, the total flow rate and effect of the cooling airflow are stabilized, the temperature rise of the bushing 1 is suppressed within a preset range, the temperature fluctuation range of the bushing 1 is narrowed from ±10℃ to ±3℃ (this is only an example and does not represent the actual value), the product yield is improved, and the fiber forming quality is ensured.

[0093] Secondly, in normal operation state, forced artificial vortex is formed, which greatly improves the total amount and effect of cooling airflow and the cooling capacity of the entire operation unit, so that more hole number of the bushing or the bushing temperature is increased, thereby improving the bushing flow and the production capacity of the entire operation unit by 15%-20%.

[0094] Thirdly, in the traditional system without state detection, the bushing 1 needs to experience the cycle of temperature rise → temperature drop → temperature rise again each time the interruption / switching is interrupted, which causes the metal fatigue to accelerate. The dynamic cooling control described above makes the service life of the bushing 1 at least 3 times longer.

[0095] Fourthly, for the bushing 1 with more than 5600 holes, the production of small diameter fibers (5-9 μm) requires more strict temperature control. The state detection module can ensure that the cooling capacity matches the high heat dissipation demand by responding to the working condition changes in real time, so that the qualified rate of small diameter fibers is increased from 72% to 93%.

[0096] Fifthly, through the cooperation of the state detection module, the water-cooled support pipe 17 and the airflow control (such as the liquid supply assembly linkage), the heat dissipation load can be shared, which can greatly reduce the power consumption of the fan and the comprehensive energy consumption (PUE).

[0097] In some embodiments, a guide structure can also be provided at the air injection port 1201, which is used to guide the airflow to form more stable air vortex.

[0098] For example, a spiral guide vane structure is provided at the air injection port 1201: the geometric shape adopts an involute spiral shape (such as an Archimedes spiral), which extends spirally along the cooling direction to guide the airflow to flow along the cooling direction and gradually turn into a rotating vortex. In addition, micron-level pits (diameter 50-200 μm, depth 20-50 μm) can also be provided on the surface of the guide vane to enhance the boundary layer disturbance by increasing the surface roughness and improve the vortex intensity.

[0099] In addition, a hierarchical guide structure layout can also be adopted: in the near-end high-frequency area (less than or equal to 50 mm from the bushing 1): the guide vane height is 8-10 mm, which is densely arranged (spacing 10-15 mm) and inclined at an angle of 45° to accelerate the airflow impact on the root of the bushing 1; in the far-end low-frequency area (more than 50 mm from the bushing 1): the guide vane height is 5-8 mm, which is sparsely arranged (spacing 20-25 mm) and inclined at an angle of 20° to maintain the stability of the vortex over a long distance.

[0100] Of course, according to actual needs, the guide vane can be connected to the air injection pipe 12 through buckling, which is convenient for single-piece replacement.

[0101] The glass fiber 2 production equipment provided in the present application comprises a bushing 1 and a cooling device for cooling the bushing 1 and the root of the glass fiber 2, which is described in the above specific embodiments. The other parts of the glass fiber 2 production equipment can refer to the related technology, which will not be expanded herein.

[0102] It should be noted that the relational terms herein, such as first and second, are used solely to distinguish one from another entity without necessarily implying any actual relationship or order between such entities.

[0103] The cooling device and the glass fiber production equipment provided by the present application are described in detail above. The principles and implementation manners of the present application are described by applying specific examples in this paper, and the above example description is only used to help understand the scheme of the present application and its core idea. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. A cooling device for use in a glass fiber production apparatus, said glass fiber production apparatus comprising a spinneret for drawing out glass fibers, characterized in that, The cooling device includes: The nozzle is provided with a plurality of jet nozzles spaced apart along the longitudinal direction. The plurality of jet nozzles are used to jet air out toward the side away from the sprue plate, so as to form an air vortex on the side of the nozzle away from the sprue plate that can reduce the temperature of the sprue plate and the root of the glass fiber. An air supply pipe, connected to the nozzle, is used to supply airflow to the nozzle; A control valve, located in the gas supply pipeline, is used to control the flow rate of the gas in the gas supply pipeline; The control system is communicatively connected to the control valve and is used to control the opening degree of the control valve according to the wire drawing operation status.

2. The cooling device as described in claim 1, characterized in that, The cooling device further includes a water-cooled support tube for supporting the sprue plate, the water-cooled support tube being connected to the nozzle, and the water-cooled support tube being configured to reduce the temperature of the airflow in the nozzle by introducing coolant.

3. The cooling device as described in claim 2, characterized in that, The cooling device further includes a liquid supply component, which is connected to the water-cooled manifold and is communicatively connected to the control system. The liquid supply component is configured to supply different flow rates of coolant to the water-cooled manifold after receiving different liquid supply signals from the control system.

4. The cooling device as described in claim 3, characterized in that, The control system includes: The flow regulation unit is used to generate corresponding flow commands based on real-time cooling requirements; The metering and supply unit is communicatively connected to the flow regulation unit and is used to control the supply component to supply a corresponding amount of coolant to the water-cooled manifold according to the flow command in response to the flow command, so as to realize the differentiated regulation of the coolant supply.

5. The cooling device as described in claim 2, characterized in that, The water-cooled support tube and the nozzle are disposed in the groove of the sluice plate, and a heat-insulating layer is provided between the water-cooled support tube and the nozzle and the sluice plate.

6. The cooling device as described in claim 5, characterized in that, The nozzle is positioned such that it is flush with the lower surface of the bottom plate of the plurality of air jets and the bottom plate of the sprue, and is flush with the lower edge of the cooling fins.

7. The cooling device as claimed in claim 1, characterized in that, The nozzle is positioned directly below the longitudinal axis of the bottom plate of the sprue, and the length of the nozzle is used to cover the longitudinal dimensions of the sprue.

8. The cooling device according to any one of claims 1-7, characterized in that, The control system includes: A temperature sensor is used to monitor the temperature of the bottom plate of the sluice plate in real time; A speed sensor is used to detect the traction speed of the glass fiber; The control module, which is communicatively connected to the temperature sensor and the speed sensor, is used to dynamically adjust the opening of the control valve according to the bottom plate temperature of the stencil and the traction speed of the glass fiber, so as to increase the airflow rate of the several jet nozzles to 110%-130% of the normal state when the drawing is interrupted, and to increase the airflow rate of the several jet nozzles to 105%-115% of the normal state when the machine head is switched.

9. The cooling device as claimed in claim 8, characterized in that, The control system also includes a wire drawing operation status detection module, which is used to detect whether the wire drawing operation is interrupted or whether the machine head is switched, and controls the opening degree of the control valve according to the detection result.

10. A glass fiber production apparatus, comprising a spinneret, characterized in that, It also includes a cooling device for cooling the sprue and the glass fiber roots, as described in any one of claims 1-9.

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