Substrate glass production and slab segmentation coordinated regulation method and device

Abstract

The present application relates to the technical field of substrate glass overflow down-draw forming, and discloses a method and device for segmented coordination regulation of substrate glass production, comprising the following steps: dividing left and right substrate plates in a muffle furnace into N independent regulation zones along the glass conveying direction, each independent regulation zone corresponding to a regulation plate, and each regulation plate being independently translated and pitch angle regulated by at least one group of horizontal regulation screws; aligning all independent regulation zones on the same side along the glass conveying direction on one side, denoted as the reference side; collecting the gap value on the opposite side of each independent regulation zone, the edge thickness and edge warping amount of the glass ribbon in the zone in real time, and compensating the regulation plate of the independent regulation zone based on the gap value deviation on the opposite side. The present application greatly reduces the complexity and regulation coupling degree of the control system by only segmenting and independently regulating the other compensation side. Meanwhile, the method introduces the edge thickness and warping amount of the glass ribbon as a closed-loop feedback.

Description

Technical Field

[0001] This invention relates to the field of substrate glass overflow pull-down molding technology, specifically to a method and apparatus for coordinated control of segmented laminate production of substrate glass. Background Technology

[0002] In the overflow pull-down forming process of substrate glass, the gap, parallelism, and perpendicularity of the left and right panels of the muffle furnace (i.e., the furnace plates symmetrically distributed on both sides of the overflow brick) directly determine the uniformity of the glass ribbon width, thickness consistency, and internal stress distribution after the high-temperature molten glass flows in. However, in a muffle furnace that is several meters long and exposed to temperatures exceeding 1000°C for extended periods, the left and right panels inevitably undergo complex and nonlinear thermo-mechanical coupling deformation: the amount of metal expansion varies in different regions, and the mechanical structure also experiences slow creep.

[0003] Traditional adjustment methods, limited by their integral or linked structures, can only adjust the overall translation or tilt of the left and right panels. They cannot independently and precisely compensate for minor thermal bulges or localized mechanical depressions on a specific side or in a small area. When a section of a panel protrudes due to thermal expansion, traditional overall adjustment methods cannot adjust that section individually and are forced to compromise. This results in an abnormally narrowed gap between the left and right sides, obstructing the flow of molten glass and ultimately causing localized thickening or indentation at the corresponding edge of the glass band. Conversely, if a section undergoes mechanical shrinkage or cooling contraction, the abnormally widened gap can lead to thinning of the edges, the appearance of wavy edges, or even microcracks. These edge thickness deviations, warping, and edge cracks that cannot be precisely corrected will be further amplified during subsequent high-temperature thinning and annealing processes. Especially in the production of high-generation (such as G8.5 and above) substrate glass, where the glass sheet is wider and the thickness requirement is thinner (usually 0.3-0.7mm), any tiny local gap unevenness will be magnified into serious quality problems, becoming a key technical bottleneck restricting the yield rate from 85% to a higher level. Summary of the Invention

[0004] To address existing problems, this invention provides a method and apparatus for segmented coordinated control of laminated plates in substrate glass production. By setting one side of the laminated plate as the reference side and adjusting only the other side (the compensation side) independently in segments, the complexity of the control system and the degree of adjustment coupling are significantly reduced. Simultaneously, this method introduces the glass strip edge thickness and warpage as closed-loop feedback, ensuring that the compensation action directly affects the final product quality, avoiding blind adjustment. This solves the problem of quality control failure caused by abnormal local gaps leading to edge thickening, thinning, wavy edges, and microcracks in traditional open-loop adjustment, where defects are amplified in subsequent processes.

[0005] To achieve the above objectives, the present invention provides the following technical solution.

[0006] This invention provides a method for segmented coordinated control of laminated plates in substrate glass production, comprising the following steps: dividing the left and right laminated plates in the muffle furnace into N independent adjustment zones along the glass conveying direction, each independent adjustment zone corresponding to an adjustment plate, and each adjustment plate being independently adjusted for translation and pitch angle by at least one set of horizontal adjustment screws; aligning all independent adjustment zones on the same side of the glass conveying direction on one side, designated as the reference side; designating all independent adjustment zones on the other side of the glass conveying direction that have not been aligned on one side as the compensation side; real-time acquisition of the opposite-side gap value of each independent adjustment zone and the corresponding edge thickness and edge warping of the glass strip in that zone; identifying whether any independent adjustment zone has an opposite-side gap value deviation; if so, performing compensation action on the adjustment plate of that independent adjustment zone based on the opposite-side gap value deviation; and real-time monitoring of the glass strip edge response after compensation. If the edge thickness recovers to the target range and the warping is eliminated, the compensation action is stopped.

[0007] As a further improvement of the present invention, the step of identifying whether there is a deviation in the opposite side gap value in a certain independent adjustment zone, and if so, performing a compensation action on the adjustment plate of the independent adjustment zone based on the deviation in the opposite side gap value, includes the following steps: if the opposite side gap value is too small, the horizontal adjustment screw on the outside of the adjustment plate of the independent adjustment zone is slightly turned out to locally increase the opposite side gap value; if the opposite side gap value is too large, the horizontal adjustment screw on the outside of the adjustment plate of the independent adjustment zone is slightly turned in to locally decrease the opposite side gap value.

[0008] As a further improvement of the present invention, the step of identifying whether there is a deviation in the clearance value of a certain independent adjustment zone, and if so, performing a compensation action on the adjustment plate of the independent adjustment zone based on the deviation in the clearance value of the opposite side, further includes the following steps: If the glass edge warps in an S-shape, adjust the two horizontal adjustment screws on the outer side of the plate to compensate for the tilt deformation in the vertical direction; wherein, the set of horizontal adjustment screws in the independent adjustment area includes at least two horizontal adjustment screws, which are used to adjust the pitch angle.

[0009] As a further improvement of the present invention, the range of the micro-spinning out or micro-spinning in is 0.01mm-0.1mm, and the stops are 0.01mm, 0.03mm, 0.05mm and 0.1mm.

[0010] As a further improvement of the present invention, the step of identifying whether there is a deviation in the opposite side gap value in an independent adjustment zone, and if so, performing a compensation action on the adjustment plate of the independent adjustment zone based on the deviation in the opposite side gap value, includes the following steps: when three or more consecutive adjacent independent adjustment zones have deviations in the opposite side gap value, it is determined to be an overall thermal deformation rather than a local problem. At this time, the compensation action is paused, an alarm is output, and a prompt for overall symmetry readjustment is given.

[0011] The present invention also provides a segmented coordinated control device for substrate glass production lamination, comprising: The left assembly consists of several adjusting plates, and the right assembly consists of the same number of adjusting plates. Each adjusting plate is independently adjustable in translation and pitch angle by at least one set of horizontal adjusting screws. Each set of horizontal adjusting screws is threadedly connected to a fixed bracket on the same side. Each adjusting plate is also equipped with a gap monitoring unit on the opposite side and a glass edge morphology detection unit.

[0012] As a further improvement of the present invention, the glass edge morphology detection unit includes a line laser and an industrial camera for extracting the glass edge thickness and warping morphology.

[0013] As a further improvement of the present invention, the opposite-side gap monitoring unit adopts a high-temperature laser displacement sensor to measure the opposite-side gap value of the independent adjustment zone.

[0014] As a further improvement of the present invention, each set of horizontal adjustment screws includes upper and lower horizontal adjustment screws for independent translation and pitch angle adjustment, and the vertical distance between the upper and lower horizontal adjustment screws is not less than 2 / 3 of the height of the plate.

[0015] As a further improvement of the present invention, each horizontal adjusting screw is connected to the adjusting plate by a ball joint or an elastic washer.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This method divides the left and right laminating plates within the muffle furnace into multiple independent adjustment zones along the glass conveying direction. Each adjustment plate is equipped with an independent horizontal adjustment screw to achieve independent translation and pitch angle adjustment on one side and in one segment. It employs a coordinated control strategy of fixing one side as a baseline and compensating in segments on the other side, solving the fundamental defect of traditional integral or linked structures that cannot provide precise compensation for thermal protrusions or mechanical depressions in localized areas on one side. By real-time acquisition of the gap values ​​on opposite sides of each independent adjustment zone and the corresponding edge thickness and warpage of the glass strip, and using the actual response of the glass strip edge as the criterion for stopping compensation, this method solves the quality control problem caused by abnormal local gaps in traditional open-loop adjustment, which easily leads to edge thickening, thinning, wavy edges, and microcracks, and these defects are amplified in subsequent processes. This method is particularly suitable for high-generation substrate glass, which is extremely sensitive to local gap fluctuations at wider and thinner plate widths.

[0017] Preferably, a clear "rotate in / rotate out" bidirectional adjustment strategy is provided for two opposite deviations: either the local gap is too large or too small, making the operation systematic. This step achieves precise reverse correction of the local gap on one side and quickly restores the target gap value.

[0018] Preferably, for the typical thermal bending deformation of S-shaped warping at the glass edge, differential adjustment of the upper and lower sets of screws is used to simultaneously compensate for horizontal displacement and vertical tilt. This step solves the angular deviation problem that simple translation adjustment cannot eliminate, restoring the perpendicularity and parallelism of the adjustment plate at its source.

[0019] Preferably, the fine adjustment range is limited to 0.01mm-0.1mm and multiple fine settings are provided, which ensures the safety of adjustment under high-temperature conditions and avoids over-adjustment or under-adjustment. The operator or control system can match the optimal step size according to the degree of deviation to achieve controllable and repeatable local compensation.

[0020] Preferably, when three or more consecutive adjacent areas show deviations in the same direction, it is automatically determined to be an overall thermal deformation rather than a local problem, suspending unilateral independent compensation and triggering an alarm. This mechanism effectively prevents repeated ineffective adjustments caused by misjudging systemic deformation as multiple independent local problems, guiding operators to perform global symmetrical readjustment.

[0021] This device provides complete hardware support for the segmented collaborative control method through a symmetrical design with the same number of adjusting plates in the left and right composite plate assemblies, and the integration of the opposite-side gap monitoring unit and the edge morphology detection unit. Each plate is equipped with an independent horizontal adjusting screw, structurally ensuring the feasibility of independent adjustment on one side and in one segment.

[0022] Preferably, a combination of a line laser and an industrial camera is used to simultaneously extract the glass edge thickness curve and warpage angle with high precision in a non-contact manner. This detection unit provides crucial real-time feedback data for closed-loop correction, upgrading the adjustment action from experience-based guesswork to data-driven.

[0023] Preferably, a high-temperature laser displacement sensor is used to directly measure the gap value on the opposite side of each independent adjustment zone, overcoming the problem of contact sensors being prone to failure in high-temperature environments. This unit provides millimeter-level or even sub-millimeter-level accurate measurement data for identifying deviation areas.

[0024] Preferably, the vertical distance between the upper and lower horizontal adjusting screws is not less than 2 / 3 of the plate height, ensuring that the two sets of screws have sufficient lever arm for adjusting the plate, thereby achieving effective pitch angle adjustment. This layout ensures that a single plate can independently correct vertical tilt deformation in addition to horizontal translation.

[0025] Preferably, a ball joint or elastic washer is used to connect the screw tip and the adjusting plate, allowing the adjusting plate to produce a slight adaptive deflection when under force, avoiding rigid jamming or local stress concentration. This structure ensures both the flexibility of adjustment and extends the service life of the connection between the screw and the adjusting plate under high-temperature conditions. Attached Figure Description

[0026] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and are not intended to specifically limit the shapes and proportions of the components. In the drawings: Figure 1 This is a schematic diagram of a segmented collaborative control method for substrate glass production plywood in one embodiment; Figure 2 A schematic diagram of the traditional commissioning principle of a muffle furnace in the production of traditional substrate glass. Figure 3 This is a top view of a substrate glass production plywood segmentation and coordinated control device in one embodiment.

[0027] The components include: 1. Adjusting plate; 2. Horizontal adjusting screw; 3. Fixed bracket. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0029] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] Example 1 like Figure 1As shown, this embodiment provides a segmented collaborative control method for substrate glass production laminations. The left and right laminations in the muffle furnace are divided into 5 independent adjustment zones along the glass conveying direction, where N equals 5. Each independent adjustment zone corresponds to an adjustment plate 1, and each adjustment plate 1 is independently adjusted for translation and pitch angle by at least one set of horizontal adjustment screws 2. Align all independent adjustment zones located on the same side of the glass conveying direction on one side, and designate this as the reference side. For all independent adjustment zones located on the other side of the glass conveying direction that are not aligned on one side, referred to as the compensation side, the opposite gap value of each independent adjustment zone and the corresponding edge thickness and edge warping of the glass strip in the zone are collected in real time to identify whether there is a deviation in the opposite gap value of an independent adjustment zone. If so, the adjustment plate 1 of the independent adjustment zone is compensated based on the deviation in the opposite gap value. After compensation, the edge response of the glass strip is monitored in real time. If the edge thickness returns to the target range and the warping is eliminated, the compensation action is stopped.

[0032] Furthermore, it is determined whether there is a deviation in the clearance value on the opposite side in a certain independent adjustment zone. If so, compensation is performed on the adjustment plate 1 of the independent adjustment zone based on the deviation in the clearance value on the opposite side, including the following steps: If the clearance value on the opposite side is too small, the horizontal adjusting screw 2 on the outside of the adjusting plate 1 of the independent adjusting zone is slightly rotated out to locally increase the clearance value on the opposite side. If the clearance value on the opposite side is too large, the horizontal adjusting screw 2 on the outside of the adjusting plate 1 of the independent adjusting zone is slightly screwed in to locally reduce the clearance value on the opposite side.

[0033] Furthermore, identifying whether there is a deviation in the clearance value on the opposite side in a certain independent adjustment zone, and if so, performing a compensation action on the adjustment plate 1 of the independent adjustment zone based on the deviation in the clearance value on the opposite side, also includes the following steps: If the glass edge warps in an S-shape, adjust the two horizontal adjustment screws 2 on the outer side of the plate to compensate for the tilt deformation in the vertical direction; wherein, the set of horizontal adjustment screws 2 in the independent adjustment area includes at least two horizontal adjustment screws 2 on the upper and lower sides, which are used to adjust the pitch angle.

[0034] Furthermore, the range of micro-screwing out or micro-screwing in is 0.01mm-0.1mm, with settings of 0.01mm, 0.03mm, 0.05mm and 0.1mm.

[0035] Furthermore, it is determined whether there is a deviation in the clearance value on the opposite side in a certain independent adjustment zone. If so, compensation is performed on the adjustment plate 1 of the independent adjustment zone based on the deviation in the clearance value on the opposite side, including the following steps: When three or more adjacent independent adjustment zones show a deviation in the clearance value on the opposite side, it is determined to be an overall thermal deformation rather than a local problem. At this time, the compensation action is paused, an alarm is output, and a prompt for overall symmetry readjustment is given.

[0036] like Figure 2 As shown, in the traditional substrate glass production process, the glass belt is in the middle of the furnace frame in the muffle furnace. The traditional adjustment principle of the laminate is an integral or linkage structure, and the left and right laminates are adjusted by an adjustment rod.

[0037] like Figure 3 As shown, this embodiment also discloses a segmented collaborative control device for substrate glass production laminations, including a left lamination assembly composed of several adjusting plates 1 and a right lamination assembly composed of the same number of adjusting plates 1. Each adjusting plate 1 is independently adjusted for translation and pitch angle by at least one set of horizontal adjusting screws 2, and each set of horizontal adjusting screws 2 is threadedly connected to a fixed bracket 3 on the same side. Each adjusting plate 1 is also equipped with a gap monitoring unit on the opposite side and a glass edge morphology detection unit. The core purpose of this control device is to achieve segmented, unilateral, and local independent adjustment of the left and right laminations, ensuring stable glass flow from the middle and improving glass forming quality and production stability.

[0038] Specifically, the glass edge morphology inspection unit includes a line laser and an industrial camera to extract the glass edge thickness and warping morphology. During use, the left and right panels are adjusted using closed-loop control, periodically inspecting the gap and symmetry across the entire area, and automatically performing fine-tuning for areas of deviation.

[0039] Specifically, the opposite-side gap monitoring unit uses a high-temperature laser displacement sensor to measure the opposite-side gap value of the independent adjustment zone. During use, the high-temperature laser rangefinder uses the overflow brick's central axis as a reference line, sets the glass strip channel width and symmetry tolerance, measures the distance between each adjustment plate 1 and the reference line, records the initial position of each adjustment plate 1, and establishes a gap reference coordinate system. The left and right composite plates are inspected segmentally along the glass conveying direction, and gap data, temperature data, and glass strip edge position data for each area are collected in real time to identify deviation areas. For adjustment plates 1 with excessive deviation, independent adjustment is performed on one side and in one segment using the corresponding horizontal adjustment screw to correct the horizontal displacement and tilt angle of the adjustment plate 1, ensuring stable glass flow from the middle of the left and right composite plates. After adjustment, the overall symmetry of the left and right composite plates is verified to ensure that the gap and parallelism meet the process requirements.

[0040] Specifically, each set of horizontal adjusting screws 2 includes upper and lower horizontal adjusting screws 2, which are used to independently push or pull them out and adjust their pitch angle. The vertical distance between the upper and lower horizontal adjusting screws 2 is not less than 2 / 3 of the height of the plate.

[0041] Specifically, each horizontal adjusting screw 2 is connected to the adjusting plate 1 via a ball joint.

[0042] Example 2 The difference between this embodiment and Embodiment 1 is that: 1) Each horizontal adjusting screw 2 is connected to the adjusting plate 1 by an elastic washer.

[0043] Example 3 The difference between this embodiment and Embodiment 1 is that: 1) The substrate glass production laminate segmentation and coordinated control device also includes a control unit; 2) Each independent adjustment zone is equipped with a high-temperature temperature sensor connected to the control unit for high-temperature adaptive compensation.

[0044] The control unit can be connected to a high-temperature temperature sensor, a gap monitoring unit on the opposite side, and a glass edge morphology detection unit. Based on the collected temperature, glass strip edge position, and thickness data of the corresponding area, a temperature-deformation-gap mapping model and a compensation database are jointly established. According to the real-time temperature data inside the muffle furnace, a pre-compensation amount is matched, and a horizontal adjustment screw is driven by a servo motor to counteract the thermal expansion deformation of the laminate under high temperature and prevent the gap value on the opposite side from drifting with temperature fluctuations.

[0045] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A method for segmented coordinated control of substrate glass manufacturing laminates, characterized in that, Includes the following steps: The left and right panels inside the muffle furnace are divided into N independent adjustment zones along the glass conveying direction. Each independent adjustment zone corresponds to an adjustment plate (1). Each adjustment plate (1) is independently translated and tilted by at least one set of horizontal adjustment screws (2). Align all independent adjustment zones located on the same side of the glass conveying direction on one side, and designate this as the reference side. For all independent adjustment zones located on the other side of the glass conveying direction that are not aligned on one side, they are referred to as the compensation side. The opposite gap value of each independent adjustment zone and the edge thickness and edge warping of the glass strip in the zone are collected in real time. It is identified whether there is a deviation in the opposite gap value of an independent adjustment zone. If so, the adjustment plate (1) of the independent adjustment zone is compensated based on the deviation in the opposite gap value. After compensation, the edge response of the glass strip is monitored in real time. If the edge thickness returns to the target range and the warping is eliminated, the compensation action is stopped.

2. The method for segmented coordinated control of substrate glass production laminations according to claim 1, characterized in that, The process of identifying whether a certain independent adjustment zone has a deviation in the opposite side clearance value, and if so, compensating for the adjustment plate (1) of that independent adjustment zone based on the deviation in the opposite side clearance value, includes the following steps: If the clearance value on the opposite side is too small, the horizontal adjusting screw (2) on the outside of the adjusting plate (1) of the independent adjusting zone is slightly rotated out to locally increase the clearance value on the opposite side. If the clearance value on the opposite side is too large, the horizontal adjusting screw (2) on the outside of the adjusting plate (1) of the independent adjusting zone is slightly screwed in to locally reduce the clearance value on the opposite side.

3. The method for segmented coordinated control of substrate glass production laminations according to claim 2, characterized in that, The step of identifying whether there is a deviation in the clearance value of a certain independent adjustment zone, and if so, compensating the adjustment plate (1) of the independent adjustment zone based on the deviation in the clearance value of the opposite side, also includes the following steps: If the glass edge warps in an S-shape, adjust the two horizontal adjustment screws (2) on the outer side of the plate to compensate for the tilt deformation in the vertical direction; wherein, the set of horizontal adjustment screws (2) in the independent adjustment area includes at least two horizontal adjustment screws (2) on the upper and lower sides, which are used to adjust the pitch angle of the plate.

4. The method for segmented coordinated control of substrate glass production laminations according to claim 2, characterized in that, The range of the micro-screwing out or micro-screwing in is 0.01mm-0.1mm, with settings of 0.01mm, 0.03mm, 0.05mm and 0.1mm.

5. The method for segmented coordinated control of substrate glass production laminations according to claim 1, characterized in that, The process of identifying whether a certain independent adjustment zone has a deviation in the opposite side clearance value, and if so, compensating for the adjustment plate (1) of that independent adjustment zone based on the deviation in the opposite side clearance value, includes the following steps: When three or more adjacent independent adjustment zones show a deviation in the clearance value on the opposite side, it is determined to be an overall thermal deformation rather than a local problem. At this time, the compensation action is paused, an alarm is output, and a prompt for overall symmetry readjustment is given.

6. A substrate glass production laminate segmentation coordinated control device, used to implement the substrate glass production laminate segmentation coordinated control method according to any one of claims 1-2, characterized in that, It includes a left assembly consisting of several adjustment plates (1) and a right assembly consisting of the same number of adjustment plates (1). Each adjustment plate (1) is independently translated and tilted by at least one set of horizontal adjustment screws (2). Each set of horizontal adjustment screws (2) is threaded to a fixed bracket (3) on the same side. Each adjustment plate (1) is also equipped with a gap monitoring unit on the opposite side and a glass edge morphology detection unit.

7. The substrate glass production laminate segmentation and coordinated control device according to claim 6, characterized in that, The glass edge morphology detection unit includes a line laser and an industrial camera, used to extract the glass edge thickness and warping morphology.

8. The substrate glass production laminate segmentation and coordinated control device according to claim 6, characterized in that, The opposite-side gap monitoring unit uses a high-temperature laser displacement sensor to measure the opposite-side gap value of the independent adjustment zone.

9. The substrate glass production laminate segmentation and coordinated control device according to claim 6, characterized in that, Each set of horizontal adjustment screws (2) includes upper and lower horizontal adjustment screws (2), which are used to independently adjust the translation and pitch angles of the plate. The vertical distance between the upper and lower horizontal adjustment screws (2) is not less than 2 / 3 of the height of the plate.

10. The substrate glass production laminate segmentation and coordinated control device according to claim 9, characterized in that, Each horizontal adjusting screw (2) is connected to the adjusting plate (1) by a ball joint or an elastic washer.

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