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

Abstract

This invention relates to the field of platinum feed channels, specifically to a variable cross-section homogenization and purification device for platinum feed channels used in glass float glass production. The device includes a feed channel body composed of a contraction section, a homogenization section, and a flaring section. The contraction section is located on one side of the feed channel body at the inlet end. The contraction section has a funnel-shaped structure, with the larger opening end located at the feed end of the feed channel body. The diameter ratio of the two openings of the contraction section is 4:3, and the length ratio of the contraction section to the diameter of the smaller opening end is 3.5:3. The homogenization section has a cylindrical structure, with one end connected to the smaller opening end of the contraction section. The flaring section is located at the end of the homogenization section furthest from the contraction section. The flaring section also has a funnel-shaped structure, with the smaller opening end connected to the end of the homogenization section. This invention can suppress glass melt backflow, simplify the process flow, reduce production energy consumption, improve homogenization efficiency, and reduce the defect rate.

Description

Technical Field

[0001] This invention relates to the field of platinum feed channels, specifically to a variable cross-section homogenization and purification device for platinum feed channels used in glass float glass production. Background Technology

[0002] In the float glass manufacturing process, the platinum feed channel is a key piece of equipment connecting the melting and forming stages. It is responsible for the stable transport of the high-temperature molten glass, the homogenization of its composition, and the purification of impurities, directly determining the forming quality of the glass ribbon within the float tin bath (such as thickness uniformity and the absence of bubbles / impurities). With the continuous expansion of float glass production capacity, the demand for platinum feed channels that offer "anti-backflow, efficient homogenization, high-temperature purification resistance, and long service life" is becoming increasingly urgent.

[0003] Existing platinum feed channels for float glass production have significant technical limitations: 1. Most feed channels adopt a uniform cross-section design (consistent inner diameter throughout), making it impossible to create local negative pressure. Due to the high viscosity and high flow resistance of the glass melt, backflow easily occurs at the junction of the feed channel inlet and middle section, leading to fluctuations in the feed rate of the float glass tin bath and uneven glass ribbon thickness; 2. The homogenization process relies on natural convection of the melt without an active disturbance structure, resulting in low homogenization efficiency and local performance differences in the glass ribbon (such as light transmittance and strength); 3. Platinum feed channels are mostly made of pure platinum, which has weak creep resistance at high temperatures (1600℃). If the pressure difference between the feed and discharge ends is not properly controlled, the feed channel is prone to deformation and has a short service life (platinum consumables are extremely expensive); 4. Existing equipment is not designed for the "continuous and stable feeding" characteristics of float glass. The homogenization, purification, and backflow prevention functions are independent, requiring the addition of a homogenization furnace and a filter tank, which extends the melt conveying path, leading to temperature loss and further affecting the stability of float glass forming. Summary of the Invention

[0004] To address the aforementioned issues, a variable cross-section homogenization and purification device for platinum feed channels in glass float process production is provided. Through a gradually changing cross-section design of the contraction section, homogenization section, and flaring section, the device utilizes the correlation between the flow velocity and pressure of the molten glass in different cross-section channels to create a stable local negative pressure zone at the outlet of the homogenization section. This gradual structure avoids turbulence and pressure disturbances caused by abrupt changes in cross-section, adapts to the flow characteristics of high-viscosity melts, and effectively suppresses backflow of the molten glass at the junction of the feed channel inlet and the middle section.

[0005] To address the problems of existing technologies, this invention provides a variable cross-section homogenization and purification device for platinum feed channels in glass float glass production, comprising a feed channel body;

[0006] The material channel body consists of a shrinkage section, a homogenization section, and a flaring 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. Through the design of staggered, honeycomb-shaped quartz filter elements in the horizontal cross-section, the horizontal projection of the filter elements fully covers the vertical cross-section of the homogenization section without affecting the smooth flow of the glass melt, ensuring that all flowing glass melt undergoes thorough filtration. The honeycomb structure reduces melt flow resistance and expands the contact area for impurity interception. Combined with the staggered arrangement, it efficiently intercepts large-sized impurities such as refractory material debris and metal particles. This avoids channel blockage to ensure the continuity of float glass production, significantly improves the purity of the glass melt, and reduces optical defects caused by impurities. Furthermore, the insertable design facilitates later maintenance and replacement, meeting the high-quality, continuous production requirements of different types of float glass. Attached Figure Description

[0027] Figure 1 This is a three-dimensional schematic diagram of a platinum feed channel homogenization and purification device applied to glass float glass production according to the present invention.

[0028] Figure 2 This is a side view of a platinum feed channel homogenization and purification device applied to glass float glass production according to the present invention.

[0029] Figure 3 This invention relates to a variable cross-section homogenization and purification device for platinum feed channels in glass float glass production. Figure 2 Schematic diagram of cross-section at point AA.

[0030] Figure 4 This is a cross-sectional three-dimensional schematic diagram of a platinum feed channel homogenization and purification device applied to glass float glass production according to the present invention.

[0031] Figure 5 This is a partial cross-sectional three-dimensional schematic diagram of a platinum material channel homogenization and purification device applied to glass float process production according to the present invention.

[0032] Figure 6 This invention relates to a variable cross-section homogenization and purification device for platinum feed channels in glass float glass production. Figure 5 A magnified view of a portion of point B in the middle.

[0033] Figure 7 This is a partial cross-sectional three-dimensional schematic diagram of a platinum feed channel homogenization and purification device for glass float process production, after the removal of the rotating shaft and metal sealing ring.

[0034] Figure 8 This invention relates to a variable cross-section homogenization and purification device for platinum feed channels in glass float glass production. Figure 7 A magnified view of a portion of point C.

[0035] Figure 9This is a three-dimensional schematic diagram of a platinum feed channel homogenization and purification device for glass float glass production after the feed channel body has been removed.

[0036] The following are the labels in the diagram: 1. Material channel body; 11. Shrinkage section; 12. Homogenization section; 13. Flaring section; 2. Homogenization unit; 21. Rotating shaft; 211. Metal sealing ring; 212. Annular groove; 22. Guide vane; 23. Rotary actuator; 231. High-temperature heat-insulating coupling; 24. Guide plate; 3. Quartz filter body. Detailed Implementation

[0037] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0038] Reference Figures 1-3 A variable cross-section homogenization and purification device for platinum feed channel in glass float process production, comprising a feed channel body 1;

[0039] The material channel body 1 consists of a shrinkage section 11, a homogenization section 12, and a flaring section 13;

[0040] 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 is 3.5:3 compared with the diameter of the smaller opening end of the contraction section 11.

[0041] The homogenization section 12 has a cylindrical structure, and one end of the homogenization section 12 is connected to the smaller opening end of the contraction end.

[0042] The flared section 13 is located at the end of the homogenizing section 12 away from the shrinking section 11. The flared section 13 has a funnel-shaped structure. The smaller opening end of the flared section 13 is connected to the end of the homogenizing section 12. The diameter ratio of the two openings of the shrinking section 11 is 4:3. The length of the shrinking section 11 is 5:3 compared to the diameter of the smaller opening end of the shrinking section 11. Temperature sensors and heating wires are installed on the shrinking section 11, the homogenizing section 12, and the flared section 13.

[0043] Because the existing material channel body 1 has a uniform inner diameter throughout, it is impossible to form a local negative pressure. Due to its high viscosity and large flow resistance, the glass melt is prone to backflow at the junction of the material channel inlet and the middle section, which leads to fluctuations in the feed rate of the float tin bath and causes uneven glass strip thickness.

[0044] To overcome the above problems, the existing material channel body 1 structure was optimized. Through a variable cross-section design, a local negative pressure was created at the connection between the homogenization section 12 and the flaring section 13 at the outlet of the homogenization section 12. This suppressed the backflow of the glass melt, reduced fluctuations in the float glass tin bath feed rate and glass strip thickness deviation, and lowered the defect rate. The specific structure and working process of this invention are as follows:

[0045] By setting temperature sensors and heating wires, the temperature in each section is kept constant, avoiding situations where the quality of the glass melt fails to meet standards due to temperature changes.

[0046] In this invention, the diameter of the homogenization 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 flaring 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 flaring section is 300 mm.

[0047] First, the compressibility of molten glass at high temperatures is very small. According to the continuity equation, when the fluid volumetric flow rate is constant, the flow velocity is inversely proportional to the cross-sectional area of ​​the flow channel. When the melt enters the homogenization section 12 (Φ300mm) from the contraction section 11 (Φ400-300mm), the cross-sectional area shrinks by about 44%, and the flow velocity increases significantly. Conversely, when the melt flows from the homogenization section 12 into the flaring section 13 (Φ300-400mm), the cross-sectional area expands by about 33%, and the flow velocity gradually decreases again. The homogenization section 12, being the region with the highest flow velocity, naturally has the lowest pressure. When the melt reaches the junction of the homogenization section 12 and the flaring section 13, this is the starting point where the melt velocity begins to decrease from its peak, and the pressure is at the lowest level in the entire flow channel, naturally forming a localized negative pressure.

[0048] Secondly, the high viscosity of the glass melt is well-suited to the variable cross-sectional design. The viscosity of float glass melt at 1500-1600℃ is approximately 10²-10³ dPa·s. If the cross-sectional change is too rapid, turbulence can easily occur, disrupting pressure stability; if it is too gradual, a significant velocity difference cannot be formed. In this invention, the contraction section 11 exhibits a gradual contraction rather than abrupt right-angle changes, and its length reaches 350mm, guiding the melt to accelerate smoothly and avoiding pressure disturbances caused by turbulence. Similarly, the "micro-expansion" design of the flaring section 13 slows down the rate of velocity decrease, keeping the negative pressure zone at the outlet of the homogenization unit 2 stable rather than disappearing instantaneously. This gradual cross-sectional design, matching the melt viscosity, provides crucial assurance for the continued existence of localized negative pressure.

[0049] Reference Figures 2-4 A homogenization unit 2 is provided in the homogenization section 12. The homogenization unit 2 includes a stirring section and a rotary driver 23.

[0050] Multiple stirring units are provided and arranged along the length of the material channel body 1 in the homogenization section 12. The stirring unit includes a rotating shaft 21 and a guide vane 22.

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

[0052] Multiple guide vanes 22 are arranged around the axis of the rotating shaft 21. All guide vanes 22 are fixedly mounted on the rotating shaft 21. Both the guide vanes 22 and the rotating shaft 21 are made of platinum.

[0053] The rotary drive 23 is located on the outside of the material channel body 1, and the rotary drive 23 is used to drive the rotating shaft 21 to rotate.

[0054] The rotary driver 23 is preferably a stepper motor. When the glass melt enters the material channel body 1, the rotary driver 23 drives the rotating shaft 21 to rotate. The stirring part stirs the flowing glass melt, avoiding the stratification phenomenon of the glass melt during the conveying process and improving the homogenization effect of the glass melt.

[0055] Reference Figure 4 , Figure 5 and Figure 7 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.

[0056] Depending on the specific glass production requirements, the dimensions of the guide plate 24 are selected according to the following standards: wave height of 50-60mm and wavelength of 250-300mm. The corrugated guide plate 24 and the rotating guide vane 22 respectively play the roles of "passive guidance" and "active disturbance" during the glass melt homogenization process. Their independent functions are clearly defined, yet their synergistic effect is significant. From an individual perspective, the guide plate 24 guides the melt to form natural vertical convection, breaking the laminar flow state while buffering the feed impact and preventing turbulence. It also adapts to the characteristics of high-viscosity melts, reducing flow energy consumption and extending their residence time in the homogenization unit 2, laying a stable foundation for subsequent processing. The guide vane 22, through its own rotation, creates a spiral flow field, using shear force to enhance melt mixing and reduce compositional deviation. Simultaneously, to improve the purity of the glass melt, a quartz filter 3 is also installed in the feed channel body 1. The rotating guide vane 22 can drive the glass melt to flow evenly through the quartz filter 3, improving impurity interception efficiency and preventing filter clogging.

[0057] When the two work together, they create a superimposed effect of "basic convection + enhanced disturbance," comprehensively optimizing the glass melt processing process. On one hand, the guide plate 24, through its corrugated structure, allows the melt to form a stable up-and-down flow trajectory, providing a uniform initial flow state for the spiral flow field of the guide vane 22, avoiding uneven mixing caused by flow field turbulence. The guide vane 22 further intensifies melt disturbance on this basis, breaking down component stratification and improving homogenization efficiency by 50% compared to traditional fixed flow channels. The melt composition deviation can be controlled within 2.5%, fully meeting the high requirements for performance uniformity in architectural and automotive glass. On the other hand, the two work together to ensure flow field stability. The guide plate 24 buffers the impact, and the guide vane 22 counteracts flow stagnation, allowing the melt to maintain stable flow at an operating temperature of 1500-1600℃, with temperature fluctuations ≤±3℃. This avoids the risk of crystallization caused by excessive retention and ensures that the melt passes uniformly through the honeycomb filter, keeping the removal rate of impurities larger than 200μm stable at 33%-35%. This significantly improves the uniformity of properties such as light transmittance and strength of the glass strip.

[0058] Reference Figures 3-5 and Figure 7 A quartz filter body 3 for filtering the 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.

[0059] By setting a quartz filter body 3 in the feed channel body 1, the homogenization unit 2 can stir and homogenize the glass melt, while the quartz filter body 3 can also intercept large-sized impurities such as refractory material debris and metal particles, thus preventing the feed channel body 1 from becoming blocked, ensuring continuous float glass production, and improving the purity of the glass melt.

[0060] It is worth noting that the quartz filter element 3 adopts an insert design, which is convenient for installation. The quartz filter element 3 is mainly composed of SiO2, with a softening point of 1713℃, and can withstand float glass melt at 1500-1600℃ for a long time.

[0061] Reference Figures 1-9 The quartz filter elements 3 are staggered on the platinum feed channel, and the projection of the quartz filter elements 3 in the horizontal direction covers the vertical cross section of the homogenization section 12.

[0062] By arranging the quartz filter bodies 3 in an alternating manner, rather than completely intercepting the material channel body 1, the fluidity of the glass melt in the material channel body 1 is guaranteed. At the same time, the projection of the alternating quartz filter bodies 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 be filtered by the quartz filter bodies 3.

[0063] Reference Figures 1-9 The horizontal cross-section of the quartz filter element 3 has a honeycomb structure.

[0064] By setting the horizontal cross-section of the quartz filter body 3 to a honeycomb structure, the resistance encountered when the glass melt comes into contact with the quartz filter body 3 is reduced.

[0065] Reference Figures 1-9 When producing architectural sodium-calcium-silicon float glass, the pore size of the quartz filter body 3 is 400μm, the pore density is 25 pores / cm², and the rotation speed of the guide plate 22 is 4r / min.

[0066] This invention provides a first embodiment based on the type of glass produced. For the production of architectural soda-lime-silica float glass, the application process and effects of the platinum feed channel variable cross-section homogenization and purification device are as follows:

[0067] I. Device Assembly

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

[0069] The guide plate 24 has a wave height of 55mm and a wavelength of 280mm. An insertable honeycomb quartz filter 3 is installed through a flange. The quartz filter 3 has a pore size of 400μm, hexagonal straight holes, a pore density of 25 pores / cm², and a length of 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, with an adjustment accuracy of ±0.1m / h. The outlet end is connected to the float tin bath inlet through a 500mm long Pt-10Rh alloy transition pipe with a 50mm thick alumina insulation layer wrapped around its outer wall.

[0071] II. Operating Parameter Settings

[0072] Rotational speed of guide vane 22: set to 4 r / min by the rotary drive 23 controller.

[0073] Feed flow rate: The flow rate is adjusted to 0.4 m / h by using a variable frequency feed pump to extend the residence time of the melt in the filter body pores.

[0074] Temperature control: The temperature controller monitors the temperature of each section in real time. When the temperature of the shrinkage section 11 is below 1598℃, the heating wire power is automatically increased to 80%; when the temperature of the homogenization section 12 is above 1582℃, the power is reduced to 60%, ensuring that the temperature fluctuation of each unit is ≤±3℃.

[0075] III. Operational Results

[0076] Melt conveying: 1600℃ glass melt is smoothly introduced from the feeding unit, enters the homogenization and purification unit through the shrink section 11, without impact turbulence, and the temperature is stable at 1598-1602℃.

[0077] Homogenization effect: The rotating guide vane 22 forms a spiral flow field, which, together with the arc-shaped guide plate 24, guides the melt to flow up and down. After running for 3 hours, the melt composition deviation was only 2.4%, and the homogenization efficiency was 50% higher than that of the fixed flow channel.

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

[0079] Float process docking: The melt is stably conveyed to the float tin bath through the discharge unit, with a feed rate fluctuation of ±0.8% and a glass strip thickness deviation of 0.07mm; after 12 hours of continuous operation, there is no melt retention and crystallization in the quartz filter body 3, and no wear or deformation on the inner wall of the platinum channel.

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

[0081] This invention provides a second embodiment based on the type of glass produced, specifically addressing the higher requirements for glass flatness in automotive float glass production scenarios, and conducting device application and effect verification:

[0082] I. Assembly and Adjustment of the Device

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

[0084] II. Operating Parameter Settings

[0085] Guide vane 22 rotation speed: Because automotive glass melt has a higher viscosity, the rotation speed is increased to 5 r / min to enhance the disturbance effect of the spiral flow field on the melt and ensure sufficient upper and lower convection.

[0086] Feed flow rate: The flow rate is adjusted to 0.5m / h by using a variable frequency feed pump to ensure production efficiency while also taking into account the impurity filtration effect.

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

[0088] III. Operational Results

[0089] Homogenization efficiency: After running for 4 hours, the glass melt composition deviation was within 2.5%, and the homogenization efficiency was improved by 50% compared with the traditional device, meeting the high requirements of automotive glass for composition uniformity.

[0090] Purification effect: The removal rate of large-sized impurities above 200μm is consistently maintained at 35%, and the cleanliness of the melt meets the standards for automotive glass production, avoiding optical defects in the glass caused by impurities.

[0091] Material supply stability: The feed rate of the float tin bath fluctuates by only ±1%, the glass strip thickness deviation is 0.09mm, and there is no melt backflow, ensuring the flatness of the automotive glass forming process.

[0092] Equipment stability: After 15 hours of continuous operation, the platinum feed channel shows no creep deformation and the filter body shows no crystal retention, making it suitable for the continuous and high-quality production needs of automotive float glass.

[0093] From the two embodiments above, it can be seen that the existing constant cross-section feed channel, due to the lack of negative pressure to suppress backflow, typically experiences fluctuations in the float tin bath feed rate exceeding 5%. In contrast, in the first patent embodiment, the feed rate fluctuation is only ±0.8%, and the glass ribbon thickness deviation is 0.07 mm. In the second embodiment, the feed rate fluctuation is ±1%, with no backflow phenomenon. The core reason for this significant improvement is that the local negative pressure at the outlet of homogenization section 12 counteracts the backflow tendency of the high-viscosity melt. If the negative pressure is absent, the melt will still experience backflow due to high flow resistance, making it difficult to control the feed rate fluctuation. At the same time, the melt temperature stability fluctuation in the embodiments is ≤±3℃, and the homogenization efficiency is improved by 50%, which also proves that the flow field did not stagnate or reverse due to abnormal pressure, further demonstrating that the formation of local negative pressure meets the design expectations.

[0094] The "anti-backflow-homogenization-purification" function is integrated into a single platinum material channel. The discharge unit is directly connected to the float tin bath through a transition pipe, which reduces the melt conveying path and temperature loss. There is no need to add a homogenization furnace or filter tank, which simplifies the process and reduces production energy consumption.

[0095] Reference Figure 6 and Figure 8 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.

[0096] By setting multiple metal sealing rings 211 to cooperate with the annular groove 212, a multi-layer sealing layer is formed, which improves the sealing performance between the rotating shaft 21 and the material channel body 1.

[0097] Reference Figure 6 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.

[0098] This avoids direct contact between the rotary driver 23 and the rotating shaft 21, which would otherwise make the output shaft of the rotary driver 23 susceptible to high temperatures, thus extending the service life of the rotary driver 23.

[0099] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by 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). 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 the rotary drive (23) is used to drive the rotating shaft (21) to rotate; 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. 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). 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).

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, The horizontal cross-section of the quartz filter (3) has a honeycomb structure.

3. The variable cross-section homogenization and purification device for platinum feed channels in glass float glass production according to claim 1, 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.

4. The variable cross-section homogenization and purification device for platinum feed channels in glass float glass production according to claim 1, 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.

5. The variable cross-section homogenization and purification device for platinum feed channels in glass float glass production according to claim 1, 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).

6. 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 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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