Platinum material channel variable cross-section homogenizing and purifying device applied to glass float production

Abstract

The invention relates to the field of platinum material channels, in particular to a platinum material channel variable cross-section homogenizing and purifying device applied to glass float production, which comprises a material channel body, the material channel body is composed of a contraction section, a homogenization section and a flaring section. The contraction section is located on one side of the feeding end of the material channel body and is of a funnel-shaped structure, the large-opening end of the contraction section is located at the feeding end of the material channel body, the diameter ratio of openings in the two ends of the contraction section is 4: 3, and the ratio of the length of the contraction section to the diameter of the small-opening end of the contraction section is 3.5: 3. The homogenizing section is of a straight cylinder structure, and one end of the homogenizing section is communicated with the smaller-opening end of the contraction end; the flaring section is arranged at one end, far away from the contraction section, of the homogenizing section, the flaring section is of a funnel-shaped structure, and one end, with a smaller opening, of the flaring section is connected with the end part of the homogenizing section. According to the invention, the backflow of the glass melt can be inhibited, the process flow is simplified, the production energy consumption is reduced, the average efficiency is improved, and the defective rate is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the field of platinum material channels, in particular to a variable cross-section homogenization and purification device for a glass float production. BACKGROUND

[0002] In a float glass production process, a platinum material channel is a key equipment connecting a melting link and a forming link, needs to bear the tasks of stable conveying, composition homogenization and impurity purification of a high-temperature glass melt, and directly determines the forming quality (such as thickness uniformity, no bubble / impurity defect) of a glass ribbon in a float tin bath. With the continuous expansion of the current float glass production capacity, the requirements for the platinum material channel, such as "anti-backflow, high-efficiency homogenization, high-temperature resistance purification and long service life", are increasingly urgent.

[0003] The existing platinum material channel for float production has obvious technical limitations: 1. The material channel is mostly designed with an equal cross-section (consistent inner diameter throughout), which cannot form a local negative pressure, and the glass melt is prone to backflow at the junction of the inlet and the middle section of the material channel due to high viscosity and large flow resistance, resulting in fluctuation of the feed quantity of the float tin bath and causing uneven thickness of the glass ribbon; 2. The homogenization link relies on natural convection of the melt without an active disturbance structure, and the homogenization efficiency is low, resulting in local performance differences (such as light transmittance and strength) of the glass ribbon; 3. The material of the platinum material channel is mostly pure platinum, which has weak anti-creep performance at high temperatures (1600 DEG C), and if the pressure difference between the inlet and the outlet is not properly controlled, the material channel is prone to deformation, and the service life is short (the cost of platinum consumables is extremely high); 4. The existing equipment is not designed for the continuous and stable feeding characteristics of float, and the homogenization, purification and anti-backflow functions are independent, which requires additional homogenization furnaces and filter tanks, prolongs the melt conveying path, causes temperature loss and further affects the stability of float forming. SUMMARY

[0004] In view of the above problems, a variable cross-section homogenization and purification device for a glass float production is provided, which is characterized by a gradual variable cross-section design of a contraction section, a homogenization section and an expanding section, utilizes the linkage relationship between the flow velocity and the pressure of the glass melt in different cross-section flow channels, and enables the outlet position of the homogenization section to form a stable local negative pressure area. This gradual change structure avoids the turbulence and pressure disorder caused by sudden change of the cross-section, adapts to the flow characteristics of the high-viscosity melt, and effectively suppresses the backflow phenomenon of the glass melt at the junction of the inlet and the middle section of the material channel.

[0005] To solve the problems in the prior art, the application provides a variable cross-section homogenization and purification device for a glass float production, which comprises a material channel body.

[0006] The material channel body is composed of a contraction section, a homogenization section and an expanding section.

[0007] The contraction section is located on one side of the feed end of the material channel body. The contraction section has a funnel-shaped structure. The larger opening end of the contraction section is located at the feed end of the material channel body. The diameter ratio of the two openings of the contraction section is 4:3. The length of the contraction section is 3.5:3 compared to the diameter of the smaller opening end.

[0008] The homogenization section has a cylindrical structure, with one end of the homogenization section connected to the smaller opening end of the contraction section;

[0009] The flared section is located at the end of the homogenization section away from the shrinkage section. The flared section has a funnel-shaped structure. The smaller opening end of the flared section is connected to the end of the homogenization section. The diameter ratio of the two openings of the shrinkage section is 4:3. The length of the shrinkage section is 5:3 compared to the diameter of the smaller opening end. Temperature sensors and heating wires are installed on the shrinkage section, homogenization section and flared section.

[0010] Preferably, a homogenization unit is provided in the homogenization section, and the homogenization unit includes a stirring section and a rotary driver;

[0011] Multiple mixing units are provided and arranged along the length of the material channel body in the homogenization section. Each mixing unit includes a rotating shaft and guide vanes.

[0012] The rotating shaft is set in the homogenization section and rotates along the width of the material channel body;

[0013] Multiple guide vanes are arranged around the axis of the rotating shaft, and all guide vanes are fixedly mounted on the rotating shaft. Both the guide vanes and the rotating shaft are made of platinum.

[0014] The rotary drive is located on the outside of the material channel body and is used to drive the shaft to rotate.

[0015] Preferably, a guide plate is laid at the bottom of the platinum channel, and the upper surface of the guide plate has an undulating structure that extends along the length of the platinum channel.

[0016] Preferably, a quartz filter body for filtering the glass melt is provided in the material channel body, and the quartz filter body is arranged on both sides of the rotating shaft.

[0017] Preferably, the quartz filter elements are staggered on the platinum feed channel, and the projection of the quartz filter elements in the horizontal direction covers the vertical cross section of the homogenization section.

[0018] Preferably, the horizontal cross-section of the quartz filter element has a honeycomb structure.

[0019] Preferably, when producing architectural sodium-calcium-silicon float glass, the pore size of the quartz filter body is 400 μm, the pore density is 25 pores / cm², and the rotation speed of the guide vane is 4 r / min.

[0020] Preferably, when producing automotive float glass, the quartz filter body has a pore size of 400 μm, a pore density of 28 pores / cm², and a flow guide plate rotation speed of 5 r / min.

[0021] Preferably, multiple metal sealing rings are fixedly sleeved at one end of the rotating shaft along the extension direction of the rotating shaft, and multiple annular grooves are provided on the side wall of the material channel body, with a metal sealing ring in each annular groove.

[0022] Preferably, a high-temperature resistant heat-insulating coupling is provided between the rotary drive and the rotating shaft to fix the two together, and the output end of the rotary drive is indirectly in contact with the rotating shaft through the high-temperature resistant heat-insulating coupling.

[0023] The advantages of this invention compared to the prior art are:

[0024] 1. This invention utilizes a gradually changing cross-section design in the contraction section, homogenization section, and flaring section. By leveraging the correlation between the flow velocity and pressure of the glass melt in different cross-section channels, a stable local negative pressure region can be formed at the outlet of the homogenization section. This gradually changing structure avoids turbulence and pressure disturbances caused by abrupt changes in cross-section, adapts to the flow characteristics of high-viscosity melts, effectively suppresses backflow of the glass melt at the junction of the inlet and middle section of the feed channel, ensures the continuity and stability of the float glass tin bath feed, reduces glass strip thickness deviation caused by feed fluctuations, lays a stable foundation for the subsequent glass forming process, and reduces the defect rate.

[0025] 2. Through the synergistic effect of platinum guide vanes arranged along the length of the homogenization section and the undulating guide plates at the bottom, combined with the active rotational disturbance of the guide vanes driven by the rotary actuator and the passive vertical convection formed by the melt guided by the guide plates, the laminar flow state that easily occurs in the glass melt during the conveying process is broken. The spiral flow field of the guide vanes creates shear force to enhance mixing, while the guide plates buffer the feed impact and extend the melt residence time. The two form a superimposed effect of "basic convection + enhanced disturbance", which effectively eliminates the problem of melt component stratification, significantly improves the homogenization degree of the glass melt, and ensures the uniformity of key properties such as light transmittance and mechanical strength of glass products, fully meeting the high performance requirements of glass in different scenarios such as construction and automobiles.

[0026] 3. The quartz filter body is designed by staggered distribution and honeycomb-shaped horizontal section, which fully covers the vertical section of the homogenizing section in the horizontal direction without affecting the smooth flow of the glass melt, ensuring that all the glass melt flowing through can be fully filtered. The honeycomb structure not only reduces the flow resistance of the melt, but also expands the contact area of the impurities interception, which cooperates with the staggered layout to efficiently intercept large-size impurities such as refractory material debris and metal particles, avoids the blockage of the channel to ensure the continuity of the float glass production, greatly improves the purity of the glass melt, reduces the optical defects caused by impurities, and the plug-in design is convenient for later maintenance and replacement, which meets the high-quality and continuous production requirements of different types of float glass. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a perspective view of a platinum channel variable cross-section homogenizing and purifying device applied to glass float production according to the present application.

[0028] Figure 2 is a side view of a platinum channel variable cross-section homogenizing and purifying device applied to glass float production according to the present application.

[0029] Figure 3 is a perspective view of a platinum channel variable cross-section homogenizing and purifying device applied to glass float production according to the present application. Figure 2 is a sectional view of the A-A position of the platinum channel variable cross-section homogenizing and purifying device according to the present application.

[0030] Figure 4 is a sectional view of the platinum channel variable cross-section homogenizing and purifying device applied to glass float production according to the present application.

[0031] Figure 5 is a sectional view of the platinum channel variable cross-section homogenizing and purifying device applied to glass float production according to the present application.

[0032] Figure 6 is a sectional view of the platinum channel variable cross-section homogenizing and purifying device applied to glass float production according to the present application. Figure 5 is a sectional view of the platinum channel variable cross-section homogenizing and purifying device applied to glass float production according to the present application.

[0033] Figure 7 is a sectional view of the platinum channel variable cross-section homogenizing and purifying device applied to glass float production according to the present application.

[0034] Figure 8 is a sectional view of the platinum channel variable cross-section homogenizing and purifying device applied to glass float production according to the present application. Figure 7 is a sectional view of the platinum channel variable cross-section homogenizing and purifying device applied to glass float production according to the present application.

[0035] Figure 9It is a three-dimensional schematic view of a platinum material channel variable cross-section homogenization and purification device applied to glass float production after removing the material channel body.

[0036] The figure label is: 1, material channel body; 11, contraction section; 12, homogenization section; 13, flared section; 2, homogenization unit; 21, rotating shaft; 211, metal sealing ring; 212, annular groove; 22, guide vane; 23, rotary driver; 231, high-temperature-resistant heat insulation coupling; 24, guide plate; 3, quartz filter body. DETAILED DESCRIPTION

[0037] In order to further understand the characteristics, technical means and specific purposes and functions achieved by the present application, the present application will be described in further detail below with reference to the drawings and specific embodiments.

[0038] REFERENCE Figures 1-3 The platinum material channel variable cross-section homogenization and purification device applied to glass float production comprises a material channel body 1;

[0039] The material channel body 1 is composed of a contraction section 11, a homogenization section 12 and a flared section 13;

[0040] The contraction section 11 is located on one side of the material channel body 1 at the inlet end, the contraction section 11 is in a funnel structure, the larger opening end of the contraction section 11 is located at the inlet end of the material channel body 1, the diameter ratio of the two ends of the contraction section 11 is 4:3, and the length of the contraction section 11 and the diameter of the smaller opening end of the contraction section 11 are in a ratio of 3.5:3;

[0041] The homogenization section 12 is in a straight cylinder structure, one end of the homogenization section 12 is in communication with the smaller opening end of the contraction section;

[0042] The flared section 13 is arranged at one end of the homogenization section 12 away from the contraction section 11, the flared section 13 is in a funnel structure, the smaller opening end of the flared section 13 is connected with the end of the homogenization section 12, the diameter ratio of the two ends of the contraction section 11 is 4:3, the length of the contraction section 11 and the diameter of the smaller opening end of the contraction section 11 are in a ratio of 5:3, and temperature sensors and heating wires are arranged on the contraction section 11, the homogenization section 12 and the flared section 13.

[0043] Since the existing material channel body 1 has a consistent inner diameter throughout, it cannot form a local negative pressure, the glass melt is prone to backflow at the junction of the inlet and the middle section of the material channel due to high viscosity and large flow resistance, which leads to fluctuations in the float tin bath feed quantity and causes uneven thickness of the glass ribbon.

[0044] In order to overcome the above problems, the existing material channel body 1 structure is optimized and designed, and through the variable cross-section design, a local negative pressure is formed at the connection between the outlet of the homogenizing section 12 and the flared section 13 of the homogenizing section 12, the glass melt backflow is inhibited, the glass ribbon thickness deviation and the float glass tin bath feeding amount fluctuation are reduced, and the defective product rate is reduced.

[0045] By setting the temperature sensor and the heating wire, the temperature in each section is constant, and the situation that the quality of the glass melt cannot meet the standard due to temperature change is avoided.

[0046] In the application, the diameter of the homogenizing section 12 is 300 mm, the diameter of the larger opening end of the contraction section 11 and the diameter of the larger opening end of the flared section 13 are both 400 mm, the diameter of the smaller opening end of the contraction section is 300 mm, and the diameter of the smaller opening end of the flared section is 300 mm.

[0047] Firstly, the amount of compression of the glass melt at high temperature is very small, and according to the continuity equation, when the fluid volume flow is constant, the flow rate is inversely proportional to the cross-sectional area of the flow channel, when the melt enters the homogenizing section 12 from the contraction section 11 Φ 400-300 mm, the cross-sectional area is reduced by about 44%, and the flow rate will be significantly increased, and when the melt flows into the flared section 13 Φ 300-400 mm from the homogenizing section 12, the cross-sectional area is expanded by about 33%, and the flow rate will gradually decrease. The homogenizing section 12 is the area with the highest flow rate, and the pressure must be the lowest, when the melt reaches the junction of the homogenizing section 12 and the flared section 13, this place is the starting point of the melt flow rate from the peak value, and the pressure is at the lowest level of the entire flow channel, and a local negative pressure is naturally formed.

[0048] Secondly, the high viscosity characteristics of the glass melt are matched with the size design of the variable cross-section, the viscosity of the float glass melt is about 10²-10³ dPa·s at 1500-1600 ℃, if the cross-section changes too sharply, turbulence will be easily generated, the pressure stability will be destroyed, and if the cross-section changes too slowly, the obvious flow rate difference cannot be formed. In the application, the contraction section 11 is gradually tapered, rather than a straight angle mutation, and the length of the contraction section 11 reaches 350 mm, which can guide the melt to accelerate smoothly and avoid pressure disorder caused by turbulence; and the “slightly expanded” design of the flared section 13 also slows down the rate of flow rate decrease, so that the negative pressure area at the outlet of the homogenizing unit 2 remains stable, rather than disappearing instantaneously. This gradually tapered cross-section design matched with the melt viscosity provides a key guarantee for the continuous existence of the local negative pressure.

[0049] Reference Figures 2-4 : A homogenizing unit 2 is arranged in the homogenizing section 12, the homogenizing unit 2 includes a stirring part and a rotary driver 23;

[0050] The stirring part is arranged in the homogenizing section 12 in multiple and along the length direction of the material channel body 1, and the stirring part includes a rotating shaft 21 and a flow guide vane 22.

[0051] The rotating shaft 21 is arranged in the homogenizing section 12 along the width direction of the material channel body 1;

[0052] A plurality of guide vanes 22 are arranged around the axis of the rotating shaft 21, and the guide vanes 22 are fixedly arranged on the rotating shaft 21. Both the guide vanes 22 and the rotating shaft 21 are made of platinum;

[0053] The rotating driver 23 is arranged outside the material channel body 1, and is used to drive the rotating shaft 21 to rotate.

[0054] The rotating driver 23 is preferably a stepping motor. When the glass melt enters the material channel body 1, the rotating driver 23 drives the rotating shaft 21 to rotate, and the stirring part stirs the glass melt in flow, so as to avoid stratification of the glass melt in the conveying process, and improve the homogenization effect of the glass melt.

[0055] Referring to Figure 4 , Figure 5 and Figure 7 : The guide plate 24 is arranged at the bottom of the platinum material channel, and the upper end face of the guide plate 24 is in a wavy structure extending along the length direction of the platinum material channel.

[0056] According to the requirements of producing different glasses, the selection standard of the size of the guide plate 24 is as follows: the wave height is 50-60 mm, and the wave length is 250-300 mm. The wavy guide plate 24 and the rotating guide vane 22 respectively undertake the functions of “passive guiding” and “active disturbance” in the glass melt homogenization process. The two independent functions are clear and the synergistic effect is significant. From the single function, the guide plate 24 can guide the melt to form natural up and down convection, break the laminar flow state, buffer the impact of feeding, avoid the generation of turbulent flow, adapt to the characteristics of high-viscosity melt, reduce the flow energy consumption, and prolong the residence time of the melt in the homogenization unit 2, thereby laying a stable foundation for subsequent processing. The guide vane 22 generates a spiral flow field by rotating itself, strengthens the melt mixing by using shear force, and reduces the composition deviation. In order to improve the purity of the glass melt, the quartz filter 3 is further arranged in the material channel body 1. The rotating guide vane 22 can drive the glass melt to flow uniformly through the quartz filter 3, improve the impurity interception efficiency, and avoid filter clogging.

[0057] When the two work together, the superimposed effect of "basic convection + enhanced disturbance" can be formed, and the glass melt treatment process is optimized comprehensively. On the one hand, the flow guide plate 24 first forms a smooth up-and-down flow trajectory for the melt through the corrugated structure, providing a uniform initial flow state for the spiral flow field of the flow guide plate 22, avoiding uneven mixing caused by flow field disorder; the flow guide plate 22 further intensifies the melt disturbance on this basis, breaks the composition stratification, and makes the homogenization efficiency improve by 50% compared with the traditional fixed flow channel, and the melt composition deviation can be controlled within 2.5%, fully meeting the high requirements of building and automobile glass on performance uniformity. On the other hand, the two cooperate to ensure the stability of the flow field. The flow guide plate 24 buffers the impact, and the flow guide plate 22 offsets the flow lag, so that the melt can flow smoothly at a working temperature of 1500-1600℃, with a temperature fluctuation of ≤±3℃, which not only avoids the risk of crystallization caused by excessive stagnation, but also ensures that the melt uniformly passes through the honeycomb filter, so that the removal rate of impurities above 200μm is stably controlled at 33%-35%. The uniformity of the performance of the glass ribbon, such as light transmittance and strength, is significantly improved.

[0058] Referring to Figures 3-5 and Figure 7 : A quartz filter 3 for filtering the glass melt is arranged in the material channel body 1, and the quartz filter 3 is arranged on both sides of the rotating shaft 21.

[0059] By arranging the quartz filter 3 in the material channel body 1, it is ensured that while the homogenization unit 2 stirs and homogenizes the glass melt, the quartz filter 3 can also intercept large-size impurities such as refractory material debris and metal particles, avoid the blockage of the material channel body 1, ensure the continuous production of the float process, and improve the purity of the glass melt.

[0060] Notably, the quartz filter 3 adopts an insertion design, which is convenient to install. The quartz filter 3 mainly contains SiO2, and has a softening point of 1713℃, which can withstand the float glass melt at 1500-1600℃ for a long time.

[0061] Referring to Figures 1-9 : The quartz filters 3 are arranged in a staggered manner on the platinum material channel, and the projection of the quartz filters 3 in the horizontal direction covers the vertical section of the homogenization section 12.

[0062] By arranging the quartz filters 3 in a staggered manner, rather than completely intercepting the material channel body 1 with the quartz filters 3, the flowability of the glass melt in the material channel body 1 is ensured, and the projection of the staggered quartz filters 3 in the horizontal direction covers the vertical section of the homogenization section 12, so that the glass melt flowing in the material channel body 1 can pass through the quartz filters 3 for filtration.

[0063] Referring to Figures 1-9 : The horizontal section of the quartz filter 3 has a honeycomb structure.

[0064] By setting the horizontal cross section of the quartz filter 3 as a honeycomb structure, the resistance experienced by the glass melt when it comes into contact with the quartz filter 3 is reduced.

[0065] Referring to Figures 1-9 : When producing architectural soda-lime-silica float glass, the pore size of the quartz filter 3 is 400 μm, the channel density is 25 holes / cm2, and the rotating speed of the flow guide sheet 22 is 4 r / min.

[0066] The present application provides a first embodiment according to the type of glass produced, and for the production of architectural soda-lime-silica float glass, the application process and effects of the platinum alloy channel variable cross-section homogenization purification device are as follows:

[0067] I. Device assembly

[0068] The contraction section 11, the homogenization section 12, and the flared section 13 are all made of Pt-10Rh alloy material. The larger opening end of the contraction section 11 is sealed and welded with the outlet of the 1600℃ melting furnace by Pt-10Rh alloy flange. A variable frequency feeding pump is arranged on the larger opening end of the contraction section 11. The weld is treated by argon arc welding and the purity reaches 99.9%. The outer wall is wrapped with 5kW / m platinum-rhodium heating wire, connected with a temperature controller, and the set temperature is 1600℃ with a control accuracy of ±1℃.

[0069] The wave height of the flow guide plate 24 is 55mm and the wavelength is 280mm. The honeycomb-shaped quartz filter 3 is inserted through the flange. The pore size of the quartz filter 3 is 400 μm, the hole is hexagonal, the channel density is 25 holes / cm2, and the length is 300mm.

[0070] The larger opening end of the flared section 13 is called the outlet end. A Pt-10Rh alloy flow control gate is installed on the outlet end to adjust the accuracy to ±0.1m / h. The outlet end is connected to the inlet of the float tin bath through a Pt-10Rh alloy transition pipe with a length of 500mm, and the outer wall of the transition pipe is wrapped with an alumina insulation layer with a thickness of 50mm.

[0071] II. Operation parameter setting

[0072] Rotating speed of the flow guide sheet 22: set to 4 r / min by the rotating driver 23 controller.

[0073] Feeding flow rate: adjust the flow rate to 0.4m / h by the variable frequency feeding pump to prolong the residence time of the melt in the filter channel.

[0074] Temperature control: The temperature controller monitors the temperature of each section in real time. When the temperature of the contraction section 11 is lower than 1598℃, the power of the heating wire is automatically increased to 80%. When the temperature of the homogenization section 12 is higher than 1582℃, the power is reduced to 60% to ensure that the temperature fluctuation of each unit is ≤±3℃.

[0075] III. Running effect

[0076] Melt delivery: The 1600℃ glass melt is smoothly introduced from the feeding unit, enters the homogenization purification unit through the contraction section 11, and has no impact turbulence, and the temperature is stabilized at 1598-1602℃.

[0077] Homogenization effect: The spiral flow field is formed by the rotation of the guide vane 22, and the melt is guided to flow up and down by the arc-shaped guide plate 24. After 3 hours of operation, sampling detection is performed, and the deviation of the melt composition is only 2.4%, and the homogenization efficiency is increased by 50% compared with the fixed flow channel.

[0078] Purification effect: The removal rate of large-size impurities above 200μm is stably at 33%, and the cleanliness of the melt meets the glass production standard.

[0079] Float butt joint: The melt is stably delivered to the float tin trough through the discharge unit, the feeding amount fluctuates ±0.8%, and the glass ribbon thickness deviation is 0.07mm; after 12 hours of continuous operation, the quartz filter body 3 has no melt stagnation and crystallization, and the inner wall of the platinum alloy channel has no wear and deformation.

[0080] Reference Figures 1-9 When producing automobile float glass, the pore diameter of the quartz filter body 3 is 400μm, the pore density is 28 holes / cm², and the rotation speed of the guide vane 22 is 5r / min.

[0081] The second embodiment of the present application is provided according to the type of the produced glass, and the flatness requirement of the glass is higher for the automobile float glass production scene, and the device application and effect verification are carried out:

[0082] I. Device assembly adjustment

[0083] The main structure of the device is consistent with the device used for building sodium calcium silicon float glass production, the contraction section 11, the homogenization section 12 and the flared section 13 are all made of Pt-10Rh alloy, and only some component parameters are adjusted according to the characteristics of the automobile glass melt: the wave height of the guide plate 24 is kept at 55mm, and the wavelength is adjusted to 290mm; the pore diameter of the honeycomb-shaped quartz filter body 3 is maintained at 400μm, and the pore density is increased to 28 holes / cm² to enhance the impurity interception capability.

[0084] II. Operation parameter setting

[0085] The rotation speed of the guide vane 22: because the viscosity of the automobile glass melt is higher, the rotation speed is increased to 5r / min, the disturbance effect of the spiral flow field on the melt is strengthened, and the up and down convection is ensured.

[0086] Feeding flow rate: the flow rate is adjusted to 0.5m / h by means of the variable frequency feeding pump, which guarantees the production efficiency while taking into account the impurity filtration effect.

[0087] Temperature control: the temperature of each section is synchronously increased by 5℃, the shrinkage section 11 is set to 1605℃, the homogenization section 12 is set to 1585℃, and the expanding section 13 is set to 1555℃, so as to reduce the flow resistance of high-viscosity melt.

[0088] III. Operation effect

[0089] Homogenization efficiency: after 4 hours of operation, the sample is detected, the composition deviation of the glass melt is within 2.5%, the homogenization efficiency is improved by 50% compared with the traditional device, and the high requirement of automobile glass on composition uniformity is met.

[0090] Purification effect: the removal rate of large-size impurities above 200μm is stably at 35%, the melt cleanliness meets the automobile glass production standard, and the optical defects of glass caused by impurities are avoided.

[0091] Feeding stability: the feeding amount fluctuation of the float tin bath is only ±1%, the glass ribbon thickness deviation is 0.09mm, and there is no melt backflow phenomenon, which ensures the flatness during the forming process of automobile glass.

[0092] Equipment stability: after 15 hours of continuous operation, the platinum material channel has no creep deformation, and the filter body has no stagnation and crystallization, which meets the production requirements of continuous and high-quality automobile float glass.

[0093] From the above two embodiments, the existing equal-section material channel has no negative pressure to suppress backflow, and the feeding amount fluctuation of the float tin bath is usually more than 5%. In the patent embodiment one, the feeding amount fluctuation is only ±0.8%, and the glass ribbon thickness deviation is 0.07mm. In the embodiment two, the feeding amount fluctuation is ±1% and there is no backflow phenomenon. The core reason for this significant improvement is that the local negative pressure at the outlet of the homogenization section 12 offsets the backflow trend of the high-viscosity melt. If the negative pressure does not exist, the melt will still backflow due to the large flow resistance, which makes it difficult to control the feeding amount fluctuation. At the same time, the melt temperature stable fluctuation ≤±3℃ and the homogenization efficiency is improved by 50% in the embodiments, which proves that the flow field does not produce stagnation or backflow due to abnormal pressure, further proving that the formation of local negative pressure meets the design expectation.

[0094] The functions of "anti-backflow-homogenization-purification" are integrated in a single platinum material channel, the discharge unit directly connects the float tin bath through the transition pipe, reduces the melt conveying path and temperature loss, and does not need to additionally add a homogenization furnace and a filter tank, which simplifies the process flow and reduces the production energy consumption.

[0095] Reference Figure 6 and Figure 8 A plurality of metal sealing rings 211 are fixedly sleeved on one end of the rotating shaft 21 along the extension direction of the rotating shaft 21, and a plurality of annular grooves 212 are arranged on the side wall of the material channel body 1, and one metal sealing ring 211 is arranged in each annular groove 212.

[0096] By setting multiple metal sealing rings 211 cooperating with the annular grooves 212, multiple sealing layers are formed, and the sealing property between the rotating shaft 21 and the material channel body 1 is improved.

[0097] Referring to Figure 6 A high-temperature-resistant heat-insulating coupling 231 is arranged between the rotating driver 23 and the rotating shaft 21 to fixedly connect the two, and the output end of the rotating driver 23 indirectly contacts the rotating shaft 21 through the high-temperature-resistant heat-insulating coupling 231.

[0098] The direct contact between the rotating driver 23 and the rotating shaft 21 is avoided, the output shaft of the rotating driver 23 is not easily affected by high temperature, and the service life of the rotating driver 23 is prolonged.

[0099] The above embodiments only express one or several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the protection scope of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.​

Claims

1. A variable cross-section homogenization and purification device for platinum feed channel in glass float process production, comprising a feed channel body (1); Its features are, The material channel body (1) consists of a shrinkage section (11), a homogenization section (12), and a flaring section (13); The contraction section (11) is located on one side of the feed end of the material channel body (1). The contraction section (11) has a funnel-shaped structure. The larger opening end of the contraction section (11) is located at the feed end of the material channel body (1). The diameter ratio of the two openings of the contraction section (11) is 4:

3. The length of the contraction section (11) and the diameter ratio of the smaller opening end of the contraction section (11) are 3.5:

3. The homogenization section (12) has a straight cylindrical structure, and one end of the homogenization section (12) is connected to the smaller opening end of the contraction end; The flared section (13) is located at the end of the homogenization section (12) away from the contraction section (11). The flared section (13) has a funnel-shaped structure. The smaller end of the flared section (13) is connected to the end of the homogenization section (12). The diameter ratio of the two openings of the contraction section (11) is 4:

3. The length of the contraction section (11) is 5:3 to the diameter of the smaller opening of the contraction section (11). Temperature sensors and heating wires are provided on the contraction section (11), the homogenization section (12) and the flared section (13).

2. The variable cross-section homogenization and purification device for platinum feed channels in glass float glass production according to claim 1, characterized in that, A homogenization unit (2) is provided in the homogenization section (12), and the homogenization unit (2) includes a stirring section and a rotary drive (23). Multiple stirring units are provided and arranged along the length of the material channel body (1) in the homogenization section (12). The stirring units include a rotating shaft (21) and a guide vane (22). The rotating shaft (21) is rotatably disposed in the homogenization section (12) along the width direction of the material channel body (1); Multiple guide vanes (22) are arranged around the axis of the rotating shaft (21). All guide vanes (22) are fixedly arranged on the rotating shaft (21). Both the guide vanes (22) and the rotating shaft (21) are made of platinum. The rotary drive (23) is located on the outside of the material channel body (1) and is used to drive the rotating shaft (21) to rotate.

3. The variable cross-section homogenization and purification device for platinum feed channels in glass float glass production according to claim 2, characterized in that, A guide plate (24) is laid at the bottom of the platinum channel. The upper surface of the guide plate (24) has an undulating structure, which extends along the length of the platinum channel.

4. The variable cross-section homogenization and purification device for platinum feed channel in glass float glass production according to claim 2, characterized in that, A quartz filter body (3) for filtering glass melt is provided in the material channel body (1), and the quartz filter body (3) is located on both sides of the rotating shaft (21).

5. The variable cross-section homogenization and purification device for platinum feed channel in glass float glass production according to claim 4, characterized in that, Quartz filter elements (3) are staggered on the platinum channel, and the projection of the quartz filter elements (3) in the horizontal direction covers the vertical section of the homogenization section (12).

6. The variable cross-section homogenization and purification device for platinum feed channel in glass float glass production according to claim 3, characterized in that, The horizontal cross-section of the quartz filter (3) has a honeycomb structure.

7. The variable cross-section homogenization and purification device for platinum feed channels in glass float glass production according to claim 4, characterized in that, When producing architectural sodium-calcium-silicon float glass, the pore size of the quartz filter body (3) is 400 μm and the pore density is 25 pores / cm², and the rotation speed of the guide plate (22) is 4 r / min.

8. The variable cross-section homogenization and purification device for platinum feed channel in glass float glass production according to claim 4, characterized in that, When producing automotive float glass, the pore size of the quartz filter body (3) is 400 μm and the pore density is 28 pores / cm², and the rotation speed of the guide plate (22) is 5 r / min.

9. The variable cross-section homogenization and purification device for platinum feed channel in glass float glass production according to claim 2, characterized in that, Multiple metal sealing rings (211) are fixedly sleeved at one end of the rotating shaft (21) along the extension direction of the rotating shaft (21), and multiple annular grooves (212) are provided on the side wall of the material channel body (1), with a metal sealing ring (211) in each annular groove (212).

10. A variable cross-section homogenization and purification device for platinum feed channels in glass float glass production according to claim 2, characterized in that, A high-temperature resistant heat-insulating coupling (231) is provided between the rotary drive (23) and the rotating shaft (21) to fix the two together. The output end of the rotary drive (23) is indirectly in contact with the rotating shaft (21) through the high-temperature resistant heat-insulating coupling (231).

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