A method for monitoring stress distribution uniformity of composite tempered glass

Abstract

The application discloses a kind of composite toughened glass stress distribution uniformity monitoring methods, comprising: by polarized light stress scanner, continuous scanning is carried out along the glass transmission direction, the stress value of each position on glass surface is collected, while the measured angle of scanning path and roll direction is recorded, and the glass thickness and roll diameter are measured, according to the glass thickness, the glass to be measured is divided into thin glass or thick glass;According to the measured angle of scanning path and roll direction, the stress value of each position on glass surface is converted, the stress value obtained by oblique scanning is uniformly mapped to the glass transmission direction, and the stress distribution record arranged along the transmission path is formed;The bending arc profile and stress transition uniformity of thin glass are comprehensively considered, and the contact trace range and stress sharing uniformity of thick glass, to generate support quality evaluation report of different thickness types of glass.

Description

Technical Field

[0001] This invention relates to the field of information technology, and in particular to a method for monitoring the stress distribution uniformity of composite tempered glass. Background Technology

[0002] In the production of composite tempered glass, the uniformity of stress distribution directly determines the glass's strength, safety, and optical quality, and is a core indicator for ensuring product qualification. With the rapid growth in demand for tempered glass in fields such as construction, automobiles, and electronic displays, the requirements for stress uniformity are becoming increasingly stringent, especially since periodic stress fluctuations in the transmission direction can significantly affect the overall performance of the glass.

[0003] The prior art discloses a stress detection device for physical tempering of large-format flat glass, with publication number CN105698985B. It discloses a technique that uses the principle of transmission birefringence to obtain stress fringe images through a large field of view uniform backlight and polarization system to evaluate the uniformity of stress distribution. However, it does not consider the influence of the glass's own weight bending and the ratio of thickness to roller diameter on the periodic stress fluctuations during roller conveying. This results in the inability to accurately identify the true source of stress uniformity in the transmission direction when the glass thickness changes.

[0004] The dynamic bending of glass caused by its own weight and support conditions during roller conveyor transport cannot be fully reflected, leading to discrepancies between assessment results and actual usage scenarios. Particularly when glass thickness varies, the same roller conveyor arrangement may exhibit drastically different stress responses on different products, which are often overlooked due to limitations in testing methods. It is conventionally believed that smaller roller spacing results in more uniform support and smaller stress fluctuations. However, in the case of thin glass, wider roller spacing actually reduces the curvature caused by the glass's own weight, lessens local sagging, and decreases the amplitude of stress fluctuations. This phenomenon is closely related to the ratio of thickness to roller diameter; when the ratio is small, the glass stiffness decreases, and the self-weight bending behavior dominates the periodic characteristics of stress distribution. If the uniformity judgment standard corresponding to a fixed spacing is continued, the natural reduction in bending of thin glass under wide spacing will be mistakenly judged as more uniform stress, or local stress concentration under close spacing will be regarded as a defect, thus failing to accurately distinguish the true source of periodic stress fluctuations.

[0005] For example, when producing 4 mm thin glass, a wider roller spacing results in a smaller sag in the middle of the glass sheet, and the surface stress stripes appear to have a reduced amplitude. However, when using 2 mm thinner glass, although the bending is still gentle at the same spacing, the stress cycle wavelength generated after matching the roller diameter shifts, causing the detected fluctuation characteristics to be inconsistent with expectations.

[0006] Therefore, how to dynamically identify the deviation between the roller spacing, the actual support path, and the stress period wavelength, while considering the ratio of glass thickness to roller diameter, and accurately evaluate the stress uniformity in the transmission direction, has become a key issue for achieving reliable monitoring. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a method for monitoring the stress distribution uniformity of composite tempered glass. This method solves the problem in existing technologies of how to dynamically identify the deviation between the roller spacing, the actual support path, and the stress period wavelength, while considering the ratio of glass thickness to roller diameter, and accurately evaluate the stress uniformity in the transmission direction.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A method for monitoring the stress distribution uniformity of composite tempered glass, comprising:

[0010] The glass is continuously scanned along the glass transport direction by a polarized stress scanner to collect stress values ​​at various locations on the glass surface. At the same time, the measured angle between the scanning path and the roller direction is recorded, and the glass thickness and roller diameter are measured. Based on the glass thickness, the glass to be tested is classified into thin glass or thick glass.

[0011] Identify the curved arc profile of thin glass in the suspended area between adjacent rollers, extract the maximum sinking position of the suspended area and its distance from the support edge of the roller, and identify the boundary of the pressure area at the contact position between thick glass and each roller, extract the contact imprint range and the position of the load center of gravity on the lower surface of the glass at the roller support point.

[0012] Based on the measured angle between the scanning path and the roller conveyor direction, the stress values ​​at various positions on the glass surface are transformed into coordinates, and the stress values ​​obtained by the oblique scanning are uniformly mapped to the glass conveying direction, forming a stress distribution record arranged along the conveying path.

[0013] Based on the stress distribution records arranged along the transmission path, combined with the maximum sinking position of the overhanging area and its distance from the edge of the roller support, the stress values ​​at the maximum sinking position of the thin glass and the edge of the roller support are extracted. Based on the curved arc profile, the degree of gradual decrease of stress from the edge to the center in the overhanging area is evaluated, and the stress transition uniformity of the thin glass along the transmission direction is obtained.

[0014] Based on the stress distribution records arranged along the transmission path, combined with the boundary of the pressure area, the range of the contact imprint, and the position of the bearing center of gravity, the stress values ​​of the area between each roller support point and the adjacent support point of the thick glass are extracted. The degree of attenuation of the stress diffusion from the support point to both sides is evaluated, and the stress distribution uniformity of the thick glass along the transmission direction is obtained.

[0015] Preferably, the method further includes:

[0016] By combining the curved profile of the thin glass with the stress transition uniformity, and the contact imprint range of the thick glass with the stress distribution uniformity, a support quality evaluation report for glass of different thicknesses is generated.

[0017] Preferably, the step of continuously scanning along the glass transport direction using a polarized stress scanner to collect stress values ​​at various locations on the glass surface, simultaneously recording the measured angle between the scanning path and the roller conveyor direction, and measuring the glass thickness and roller conveyor diameter, classifying the glass under test into thin or thick glass based on its thickness, includes:

[0018] The optical path difference values ​​of each sampling point along the scanning path on the glass surface are obtained. The stress value corresponding to each sampling point is calculated based on the optical path difference values ​​and the photoelastic constant of the glass material. At the same time, the relative positional relationship between the scanner movement trajectory and the glass edge is recorded. The measured angle between the scanning path and the roller arrangement direction is determined to form a stress acquisition record with position marks and angle information.

[0019] According to the position marks in the stress acquisition record, measurement points are selected at intervals along the transmission direction on the glass surface. The vertical distance from the upper surface of the glass to the scanner probe at each measurement point is measured. The arithmetic mean of the vertical distance is calculated as the measured thickness. At the same time, the outer circumference diameter of the roller is measured. The measured thickness is divided by the roller diameter to obtain the thickness-to-diameter ratio.

[0020] By comparing the thickness-to-diameter ratio with the thickness classification threshold, it is determined whether the glass under test belongs to the thick glass category or the thin glass category, and the thickness type identifier and corresponding stress acquisition record of the glass under test are obtained.

[0021] Preferably, the step of identifying the curved arc profile of the thin glass in the suspended area between adjacent rollers, extracting the maximum sinking position of the suspended area and its distance from the roller support edge, and simultaneously identifying the boundary of the pressure area at the contact position between the thick glass and each roller, and extracting the contact imprint range and bearing center position of the lower surface of the glass at the roller support point, includes:

[0022] According to the thickness type of the glass to be tested, when the thickness type is thin glass, a line laser profilometer is used to scan the lower surface of the glass along the glass transport direction to obtain the height distribution data of the suspended area between two adjacent rollers. The height of the support edges of the two rollers is used as the baseline. The sinking amount of each sampling point in the suspended area relative to the baseline is extracted. A curved arc profile curve is fitted according to the distribution pattern of the sinking amount along the transport direction. The sampling point with the largest sinking amount is located from the curved arc profile curve as the maximum sinking position. The horizontal distance between the maximum sinking position and the support edges of the two rollers is measured.

[0023] When the thickness type is identified as thick glass, a pressure-sensitive thin film sensor is laid on the surface of each roller to record the pressure distribution image of the contact area between the lower surface of the glass and the roller. The pixel area with a pressure value higher than the contact threshold is identified from the pressure distribution image as the pressure area. The contact boundary is formed by connecting the outer pixels of the pressure area. The range of the contact imprint is determined according to the closed area enclosed by the contact boundary.

[0024] Based on the pressure value and position coordinates of each pixel within the contact imprint range, the position coordinates are weighted and averaged using the pressure value as the weight. The weighted average of the horizontal coordinates and the weighted average of the vertical coordinates constitute the two-dimensional coordinates of the bearing center position, thus obtaining the bearing center position at each roller support point.

[0025] The curved profile curve and maximum sinking position of thin glass and its horizontal distance from the roller support edge are summarized, as well as the contact imprint range and load center position of each roller of thick glass. These are stored separately according to the thickness type identifier to form the hanging deformation characteristic record of thin glass and the contact support characteristic record of thick glass.

[0026] Preferably, the stress values ​​obtained by oblique scanning are uniformly mapped to the glass transport direction to form a stress distribution record arranged along the transport path, including:

[0027] Based on the original position coordinates of each sampling point in the stress acquisition record and the measured angle between the scanning path and the direction of the roller conveyor, the direction of the roller conveyor is used as the horizontal axis of the transmission direction coordinate system, and the direction perpendicular to the direction of the roller conveyor is used as the vertical axis. The original position coordinates of each sampling point are decomposed into a horizontal component along the transmission direction and a vertical component perpendicular to the transmission direction. The horizontal component is retained as the position identifier of each sampling point in the transmission direction, and the transformed position coordinates of each sampling point are obtained.

[0028] Based on the transformed position coordinates, all sampling points are sorted in ascending order of the lateral component values. The sorted sampling points and their corresponding stress values ​​are then arranged sequentially according to the transmission direction to form an ordered stress value sequence along the transmission path.

[0029] Based on the lateral component spacing between adjacent sampling points in the stress value sequence, linear interpolation is used to supplement the stress values ​​at intermediate positions in regions where the spacing exceeds the uniform spacing threshold, forming a stress distribution record arranged along the transmission path.

[0030] Preferably, obtaining the uniformity of stress transition along the transmission direction of the thin glass includes:

[0031] Based on the stress distribution records arranged along the transmission path and the hanging deformation characteristic records of thin glass, the transmission direction coordinates corresponding to the maximum sinking position are located, and the stress value at the transmission direction coordinates is extracted as the center stress value. At the same time, the transmission direction coordinates corresponding to the support edges of the two side rollers are located, and the stress value at the support edge is extracted as the edge stress value.

[0032] The difference between the central stress value and the edge stress value is calculated as the stress drop value. Combined with the arc length from the support edge to the maximum sinking position on the curved profile curve, the stress change rate per unit arc length is calculated.

[0033] The stress transition uniformity of the thin glass along the transmission direction is determined by comparing the stress change rate with the smoothness threshold.

[0034] Preferably, obtaining the stress distribution uniformity of thick glass along the transmission direction includes:

[0035] Based on the stress distribution records arranged along the transmission path and the contact support characteristic records of thick glass, the stress values ​​at each reference point are extracted as support point stress values, with the transmission direction coordinates of the bearing center of gravity of each roller as the reference point.

[0036] Based on the boundary of the contact imprint range of two adjacent roller tracks, the non-contact area between the two imprint ranges is determined as the support interval area. The stress value of each sampling point in the support interval area is extracted from the stress distribution record. With the stress value of the support point of the adjacent two roller tracks as a reference, the difference between the stress value of each sampling point in the support interval area and the average value of the stress value of the support points on both sides is calculated to obtain the stress attenuation distribution of the support interval area.

[0037] Based on the stress attenuation distribution, the stress attenuation amount is extracted sequentially from the support point to the midpoint of the support interval along the transmission direction. The change range of stress attenuation amount between adjacent sampling points is calculated. The change range is compared with the attenuation smoothness threshold to determine the attenuation smoothness of each support interval.

[0038] Based on the degree of attenuation smoothness, the ratio of the number of smoothly attenuated sections to the total number of support intervals is calculated, and this ratio is used as the stress distribution uniformity of the thick glass along the transmission direction.

[0039] Preferably, a support quality evaluation report for glass of different thicknesses is generated, including:

[0040] Based on the thickness type, the bending arc profile curve and stress transition uniformity are summarized for thin glass, and the contact imprint range and stress distribution uniformity are summarized for thick glass. The quality index sets for thin glass support and the quality index sets for thick glass support are formed according to the thickness type.

[0041] According to the preset report template, fill the template with the thickness type, various indicator values ​​and corresponding graphics, and output a support quality evaluation report containing the thickness type, various indicator values ​​and graphics.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] This invention discloses a method for monitoring the uniformity of stress distribution in composite tempered glass. Addressing the issues of support stability and load balance caused by thickness differences in glass during roller conveyor transport, the method analyzes the bending arc profile and stress transition uniformity of the overhanging area of ​​thin glass, and evaluates the contact imprint range and stress distribution uniformity of thick glass. This is integrated into a logically related business problem: how to accurately assess the support quality of glass of different thicknesses during transport. The invention continuously scans the stress values ​​on the glass surface and performs coordinate transformation. Combining measured angles with path mapping, it generates a stress distribution record along the transport direction. This allows for the extraction of stress characteristics at key locations, a comprehensive evaluation of the rationality of roller conveyor spacing and load distribution balance, and ultimately, the generation of a support quality evaluation report. Its core technical effect is to improve the stability of the roller conveyor system for glass support, ensure uniform bending stress distribution in thin glass and balanced load-bearing capacity in thick glass, and optimize the transport process. Attached Figure Description

[0044] Figure 1 This is a flowchart of a method for monitoring the stress distribution uniformity of composite tempered glass according to the present invention.

[0045] Figure 2 This is a schematic diagram of a method for monitoring the stress distribution uniformity of composite tempered glass according to the present invention.

[0046] Figure 3 This is another schematic diagram of a method for monitoring the uniformity of stress distribution in composite tempered glass according to the present invention. Detailed Implementation

[0047] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] like Figures 1-3 This embodiment of a method for monitoring the stress distribution uniformity of composite tempered glass may specifically include:

[0049] Please see Figure 1 , Figure 1This application illustrates a method for glass stress detection and support quality evaluation, applicable to glass production or testing equipment. This equipment can be an online testing system on a composite tempered glass production line, and may include a polarized stress scanner, a laser rangefinder, a line laser profilometer, and a data processing unit. In one embodiment, the equipment may include a processor connected to the aforementioned sensors and scanning devices; the processor can be the execution entity of the method. Specifically, the method includes steps S101 to S106.

[0050] S101: The glass surface is continuously scanned along the glass transport direction by a polarized stress scanner to collect stress values ​​at various locations on the glass surface. At the same time, the measured angle between the scanning path and the roller direction is recorded, and the glass thickness and roller diameter are measured. Based on the glass thickness, the glass to be tested is classified as thin glass or thick glass.

[0051] In one implementation, when a polarized stress scanner continuously scans along the glass transport direction, the light source inside the scanner emits a polarized beam that penetrates the glass surface. When stress exists inside the glass, the two orthogonal components of the polarized light will generate a phase difference, which is the optical path difference. The scanner probe moves along a preset trajectory and records the optical path difference value point by point on the glass surface at fixed sampling intervals. The setting of the sampling interval is related to the scanning accuracy; the smaller the sampling interval, the richer the details of the stress distribution obtained. By continuously scanning along the glass transport direction with a polarized stress scanner, the optical path difference value of each sampling point along the scanning path on the glass surface is obtained. Based on the optical path difference value and the preset photoelastic constant of the glass material, the stress value corresponding to each sampling point is calculated.

[0052] As one implementation method, the photoelastic constant is a physical parameter describing the strength of the birefringence effect produced by a transparent material under stress. Different glass materials have different photoelastic constants. For example, the photoelastic constant of soda-lime glass differs from that of borosilicate glass. Before actual testing, the corresponding photoelastic constant needs to be retrieved from a preset material parameter library according to the material type of the glass to be tested. The stress value is calculated as follows: the optical path difference is divided by the product of the photoelastic constant and the glass thickness. The quotient is the stress value at that sampling point. This calculation is repeated at each sampling point to form a stress value sequence covering the entire scanning path. The stress calculation formula is σ=δ / (C×t), where σ is the stress value, δ is the optical path difference, C is the photoelastic constant, and t is the measured thickness.

[0053] Specifically, the relative positional relationship between the scanner's movement trajectory and the glass edge is recorded simultaneously. The measured angle between the scanning path and the roller conveyor arrangement direction is determined, forming a stress acquisition record with position markers and angle information. The two-dimensional coordinates of the scanner probe on the glass surface are output, and these coordinates are stored as position markers bound to the stress values ​​of the corresponding sampling points. The measured angle between the scanning path and the roller conveyor arrangement direction is obtained through an angle measuring device fixed on the scanner bracket, which measures the deflection angle of the scanning trajectory with the roller conveyor axis direction as a reference.

[0054] In one implementation method, based on the position markers in the stress acquisition record, a laser rangefinder is used to select several spaced measurement points on the glass surface along the transmission direction, and the vertical distance from the upper surface of the glass to the scanner probe at each measurement point is measured. It should be noted that when measuring the glass thickness, the laser rangefinder selects several measurement points on the glass surface along the transmission direction; the number of measurement points is determined according to the glass dimensions. The laser rangefinder emits a laser beam towards the upper surface of the glass and receives the reflected signal. The vertical distance is calculated based on the laser round-trip time, and the arithmetic mean of the vertical distances at all measurement points is calculated to eliminate the influence of local undulations on the glass surface on the thickness measurement. This arithmetic mean is then used as the measured thickness.

[0055] In one implementation, the outer circumference diameter of the roller conveyor is simultaneously measured, and the measured thickness is divided by the roller conveyor diameter to obtain the thickness-to-diameter ratio (CTR). In one possible implementation, the CTR is calculated by dividing the measured thickness as the numerator and the roller conveyor diameter as the denominator. The CTR is then compared to a preset thickness classification threshold. If the CTR is greater than or equal to the threshold, the glass under test is determined to be thick glass; if the CTR is less than the threshold, the glass is determined to be thin glass, thus obtaining the thickness type identifier and corresponding stress acquisition record for the glass under test.

[0056] Specifically, the definition of thin and thick glass is not based on a fixed thickness value, but rather on a dynamic determination based on the relationship between the thickness-to-diameter ratio (the ratio of glass thickness to roller conveyor diameter) and a preset threshold. This threshold is pre-set based on empirical data from the production process of composite tempered glass, with the core basis being the differences in the mechanical behavior of the glass in the roller conveyor system. When the thickness-to-diameter ratio is greater than or equal to the threshold, it indicates that the glass has high relative stiffness, and its structural strength is sufficient to resist bending deformation under its own weight. During roller conveyor transport, contact support is the dominant deformation mode, and it is classified as thick glass. When the thickness-to-diameter ratio is less than the threshold, it indicates that the glass has low relative stiffness, and its structural strength is insufficient to completely resist bending caused by its own weight. It is prone to bending under its own weight in the suspended areas between rollers, and is classified as thin glass. This dynamic classification method allows glass of the same thickness to have different type identifications under different process conditions.

[0057] For example, on a production line with a roller spacing of 300mm, 8mm thick glass might be classified as thick glass due to its larger thickness-to-diameter ratio, maintaining good flatness during transport. However, on a production line with a roller spacing of 500mm, the same 8mm thick glass would be classified as thin glass due to its lower thickness-to-diameter ratio, requiring a stress monitoring strategy tailored to its self-weight bending characteristics. Similarly, on the same production line with a roller spacing of 400mm, 12mm thick glass might be classified as thick glass, while 5mm thick glass would be classified as thin glass, necessitating separate stress distribution uniformity monitoring schemes matched to their deformation modes. The associated storage of thickness type identification and stress acquisition records provides a data foundation for subsequently employing differentiated stress uniformity assessment methods for different thickness types of glass.

[0058] S102: Identify the curved arc profile of thin glass in the suspended area between adjacent rollers, extract the maximum sinking position of the suspended area and its distance from the roller support edge, and simultaneously identify the pressure area boundary of the contact position between thick glass and each roller, extract the contact imprint range and bearing center position of the lower surface of the glass at the roller support point.

[0059] In one implementation method, when classifying glass according to its thickness type, thin and thick glass exhibit different deformation characteristics during roller conveying. Due to its lower stiffness, thin glass undergoes downward bending deformation in the suspended area between adjacent rollers, forming a hanging arc-shaped profile. Thick glass, with its higher stiffness, mainly exhibits localized compressive deformation at the contact point with the rollers, with relatively less bending in the suspended area.

[0060] As one implementation method, based on the thickness type identifier of the glass to be tested, if the thickness type identifier indicates thin glass, a line laser profilometer is used to scan the lower surface of the glass along the glass transport direction to obtain the height distribution data of the suspended area between two adjacent rollers. Specifically, the process of the line laser profilometer scanning the lower surface of the glass along the glass transport direction is as follows: The line laser profilometer emits a linear laser beam that is projected onto the lower surface of the glass, forming a bright line on the glass surface. The image sensor built into the profilometer captures the shape of this bright line from a side angle. When there is a change in the height of the lower surface of the glass, the position of the bright line on the image sensor will shift. The shift is converted into a height value according to the triangulation principle. The profilometer moves at a constant speed along the transport direction, continuously collecting the height values ​​at each position, forming height distribution data covering the suspended area between two adjacent rollers. This height distribution data is arranged with the position coordinates of the transport direction as the horizontal axis and the height value as the vertical axis.

[0061] Specifically, using the height of the support edges of the two roller conveyors as a baseline, the subsidence of each sampling point in the suspended area relative to the baseline is extracted. The baseline is set using the height values ​​at the support edges of the two roller conveyors. The support edge of the roller conveyor refers to the position where the lower surface of the glass is out of contact with the circumference of the roller conveyor. At this position, the glass has not yet undergone overhang deformation, and its height value represents the original height of the glass in the supported state. The line connecting the height values ​​of the two support edges is used as a horizontal baseline, and the vertical difference between the height value of each sampling point in the suspended area and the baseline is the subsidence.

[0062] As one implementation method, a curved arc profile curve is fitted based on the distribution pattern of the sinking amount along the transport direction. The sampling point with the largest sinking amount is located from the curved arc profile curve as the maximum sinking position, and the horizontal distance between the maximum sinking position and the edges of the roller support on both sides is measured. It should be noted that the fitting of the curved arc profile curve is based on the distribution pattern of the sinking amount along the transport direction. For example, a polynomial fitting method is used to fit the discrete sinking amount data points to the curve, and the fitting order is determined according to the span of the suspended area and the characteristics of the glass material. The fitted curve exhibits an arc-shaped feature with sinking in the middle and approaching zero at both ends. The curvature of the curve reflects the degree of curvature of the glass in the suspended area. The point with the largest sinking amount value is extracted from the fitted curve as the maximum sinking position. This position is usually located near the middle of the suspended area but may be offset due to uneven glass thickness distribution or differences in roller spacing. The horizontal distances between the maximum sinking position and the edges of the roller support on both sides are measured respectively, and the ratio of the two distance values ​​reflects the relative position of the maximum sinking point in the suspended area.

[0063] In another implementation, if the thickness type is identified as thick glass, a pressure-sensitive thin-film sensor is laid on the surface of each roller conveyor. When the glass is transported on the roller conveyor, the pressure distribution image of the area where the lower surface of the glass contacts the roller conveyor is recorded. In one possible implementation, the pressure-bearing area of ​​the thick glass is identified using a pressure-sensitive thin-film sensor. A pressure-sensitive thin-film sensor is a flexible thin-film material with pressure-sensitive resistor units distributed inside. When external pressure is applied to the surface of the thin film, the resistance value at the pressure location changes. By detecting the change in resistance, the pressure value at that location can be calculated. The pressure-sensitive thin-film sensor is wrapped around the circumferential surface of the roller conveyor. When the glass is transported on the roller conveyor, the area where the lower surface of the glass contacts the roller conveyor exerts pressure on the thin film. The sensor outputs the pressure values ​​at each location in matrix form, forming a pressure distribution image.

[0064] Specifically, pixel regions with pressure values ​​higher than a preset contact threshold are identified from the pressure distribution image as pressure-affected areas. A contact boundary is formed by connecting the outer pixels of these pressure-affected areas, and the contact imprint range is determined based on the closed area enclosed by the contact boundary. For example, when identifying pressure-affected areas from the pressure distribution image, a preset contact threshold is set as the judgment criterion. Pixels with pressure values ​​higher than this threshold are marked as contact pixels, and pixels with pressure values ​​lower than the threshold are marked as non-contact pixels. Boundary pixels are extracted along the outer edge of the contact pixel region, and adjacent boundary pixels are connected sequentially to form a closed contact boundary curve. The closed area enclosed by the contact boundary curve is the contact imprint range, and its area reflects the effective bearing area between the glass and the roller conveyor.

[0065] As one implementation method, based on the pressure value and position coordinates of each pixel within the contact imprint area, a weighted average calculation is performed on the position coordinates using the pressure value as a weight. The weighted average of the horizontal coordinates and the weighted average of the vertical coordinates constitute a two-dimensional coordinate system for the bearing center of gravity, thus obtaining the bearing center of gravity position at each roller support point. It can be understood that the bearing center of gravity position is calculated using a pressure-weighted averaging method. Each pixel within the contact imprint area has two attributes: position coordinates and pressure value. The pressure value is used as a weighting factor to perform a weighted average calculation on the horizontal and vertical coordinates respectively. Let there be n pixels within the contact imprint area, with the horizontal coordinate of the i-th pixel being x_i and the vertical coordinate being y_i. i The pressure value is p i Then the horizontal coordinate X of the bearing center of gravity c =Σ(x i ×p i ) / Σp i Vertical coordinate Y c =Σ(y i ×p i ) / Σp i This position indicates the point where the roller conveyor exerts its equivalent load on the glass.

[0066] Furthermore, the curved profile curves, maximum sinking positions, and horizontal distances from the roller support edges of thin glass are summarized, along with the contact imprint ranges and load-bearing center positions of each roller on thick glass. These are stored separately according to the thickness type identifier, forming a record of the sag deformation characteristics of thin glass and a record of the contact support characteristics of thick glass. The two types of characteristic records are stored separately according to the thickness type identifier, facilitating the use of differentiated stress uniformity assessment methods for glass of different thicknesses.

[0067] S103: Based on the measured angle between the scanning path and the roller direction, the stress values ​​at various positions on the glass surface are transformed into coordinates, and the stress values ​​obtained by the oblique scanning are uniformly mapped to the glass conveying direction to form a stress distribution record arranged along the conveying path.

[0068] As one implementation method, when the scanning path has a measured angle relative to the roller conveyor direction, the stress data points collected by the polarized stress scanner along the oblique path are not parallel to the glass transport direction in spatial distribution. The purpose of coordinate transformation is to uniformly map the obliquely distributed sampling points to the transport direction coordinate system, so that the stress data are arranged according to the actual glass transport path, which facilitates subsequent analysis of the periodic characteristics of the stress distribution along the transport direction.

[0069] Specifically, based on the original position coordinates of each sampling point in the stress acquisition record and the measured angle between the scanning path and the roller conveyor direction, the original position coordinates of each sampling point are decomposed into a lateral component along the transmission direction and a longitudinal component perpendicular to the transmission direction, using the roller conveyor direction as the horizontal axis and the direction perpendicular to the roller conveyor direction as the vertical axis. The lateral component is retained as the position identifier of each sampling point in the transmission direction, thus obtaining the transformed position coordinates of each sampling point. In one embodiment, the coordinate transformation uses a trigonometric function decomposition method. Let the measured angle between the scanning path and the roller conveyor direction be θ, and the cumulative distance of the sampling point on the scanning path be D. Then, the lateral component x = D × cosθ, and the longitudinal component y = D × sinθ. The lateral component represents the position of the sampling point in the transmission direction, and the longitudinal component represents the lateral offset of the sampling point from the centerline of the transmission path. Since the subsequent stress uniformity assessment is carried out in the transmission direction, only the lateral component is retained as the position identifier, and the longitudinal component does not participate in the subsequent processing in this step.

[0070] As one implementation method, based on the transformed position coordinates, the lateral component values ​​of each sampling point are extracted. All sampling points are then sorted in ascending order of lateral component values. The sorted sampling points and their corresponding stress values ​​are arranged sequentially along the transmission direction, forming an ordered stress value sequence distributed along the transmission path. Specifically, after arranging all sampling points in ascending order of lateral component values, a stress value sequence is formed, distributed sequentially from the start to the end of the glass transmission process. During the sorting process, the stress value of each sampling point remains bound to its lateral component. After sorting, the stress value sequence reflects the stress magnitude at each position along the transmission path.

[0071] As one implementation method, based on the lateral component spacing between adjacent sampling points in the stress value sequence, a linear interpolation method is used to supplement the stress value at the intermediate position in areas where the spacing exceeds a preset uniform spacing threshold. This makes the distribution of sampling points along the transmission path more uniform, forming a stress distribution record arranged along the transmission path. It should be noted that since the sampling interval is fixed during the scanner's oblique movement, the lateral component spacing between adjacent sampling points will be unevenly distributed after coordinate transformation due to the angle. For example, when the measured angle is large, the projected spacing of adjacent sampling points in the transmission direction will decrease accordingly; when the scanner accelerates or decelerates or passes through the glass edge area, the spacing in local areas will also fluctuate. For areas where the spacing exceeds the preset uniform spacing threshold, a linear interpolation method is used to supplement the stress value at the intermediate position between two adjacent sampling points. The stress value at the interpolation point is determined based on the linear proportional relationship between the stress values ​​of the sampling points at both ends. After interpolation, the distribution of sampling points along the transmission path becomes more uniform, and the resulting stress distribution record can reflect the stress variation pattern in the transmission direction with a stable spatial resolution.

[0072] S104: Based on the stress distribution records arranged along the transmission path, combined with the maximum sinking position of the overhanging area and its distance from the edge of the roller support, extract the stress values ​​at the maximum sinking position of the thin glass and the edge of the roller support. Based on the curved arc profile, evaluate the degree of gradual decrease of stress from the edge to the center in the overhanging area, and obtain the stress transition uniformity of the thin glass along the transmission direction.

[0073] In one implementation, the thin glass bends downwards under its own weight in the suspended area between adjacent rollers, and this bending deformation induces additional stress within the glass. At the support edges, the glass is constrained by the rollers, resulting in relatively high stress values; at the maximum sinking position, the glass has the greatest curvature but is less constrained, resulting in relatively low stress values. The difference between the center stress value and the edge stress value reflects the gradient characteristics of stress distribution within the suspended area. Specifically, based on stress distribution records arranged along the transmission path and records of the thin glass's suspended deformation characteristics, the transmission direction coordinates corresponding to the maximum sinking position are located from the stress distribution records, and the stress value at these coordinates is extracted as the center stress value. Simultaneously, the transmission direction coordinates corresponding to the support edges of both rollers are located, and the stress values ​​at these support edges are extracted as edge stress values, thus obtaining the center stress value and edge stress value within the suspended area.

[0074] As one implementation method, the process of extracting the center stress value and edge stress value from the stress distribution record is as follows: Based on the transmission direction coordinates of the maximum sinking position in the overhang deformation feature record, a stress data point matching the coordinates is found in the stress distribution record, and its stress value is read as the center stress value; based on the transmission direction coordinates of the two roller support edges in the overhang deformation feature record, matching stress data points are found in the stress distribution record respectively, and their stress values ​​are read and averaged as the edge stress value. For example, if there is a difference in stress values ​​on both sides of the support edge, averaging can eliminate the deviation caused by the asymmetry of the roller support.

[0075] Specifically, based on the central stress value and the edge stress value, the difference between the edge stress value and the central stress value is calculated as the stress drop value. Combined with the arc length on the curved profile curve from the support edge to the maximum sinking position, the stress drop value is divided by the arc length to obtain the stress change rate per unit arc length. This stress change rate reflects the steepness of the stress decrease from the edge to the center. The stress drop value represents the absolute difference between the edge stress value and the central stress value, reflecting the total magnitude of the stress decrease from the edge to the center within the overhanging area. The arc length refers to the length of the curve on the curved profile curve from the support edge to the maximum sinking position, not the straight-line distance between the two points. Dividing the stress drop value by the arc length yields the stress change rate per unit arc length; a smaller rate indicates a gentler stress decrease, while a larger rate indicates a steeper stress decrease.

[0076] It should be noted that, based on the comparison between the stress change rate and a preset smoothness threshold, if the stress change rate is less than or equal to the smoothness threshold, the difference between the smoothness threshold and the stress change rate is normalized and used as the stress transition uniformity; if the stress change rate is greater than the smoothness threshold, the proportion of the stress change rate exceeding the smoothness threshold is taken as the reciprocal and normalized, thus obtaining the stress transition uniformity of the thin glass along the transmission direction. Stress transition uniformity is a normalized quantitative indicator, with a value ranging between zero and one. Let the stress change rate be R, and the smoothness threshold be R0. th The stress transition uniformity U is calculated as follows: when R is less than or equal to R th When U equals R th The difference between subtracting R and dividing by R th When R is greater than R th When U equals R th Divide by R. A higher stress transition uniformity value indicates a gentler change in stress from the edge to the center, while a lower value indicates a steeper change in stress.

[0077] S105: Based on the stress distribution records arranged along the transmission path, combined with the boundary of the pressure area, the range of the contact imprint, and the position of the load center, extract the stress values ​​of the area between each roller support point and the adjacent support point of the thick glass, evaluate the degree of attenuation of the stress diffusion from the support point to both sides, and obtain the stress distribution uniformity of the thick glass along the transmission direction.

[0078] In one implementation method, thick glass, due to its high rigidity, relies primarily on the support points of each roller conveyor to bear its weight during roller transport. The stress distribution at each support point and the stress transition between support points directly reflect the balance of the load distribution on the glass during roller transport. The extraction of support point stress values ​​is based on the bearing center of gravity position, which is the equivalent load application point calculated from the pressure distribution image collected by the pressure-sensitive thin-film sensor in the previous step. Specifically, based on the stress distribution records arranged along the transport path and the contact support characteristic records of the thick glass, and using the transport direction coordinates of the bearing center of gravity position of each roller conveyor as the reference point, the stress values ​​at each reference point are extracted from the stress distribution records as support point stress values, thus obtaining the support point stress values ​​of each roller conveyor.

[0079] As one implementation method, the process of extracting the support point stress value from the stress distribution record is as follows: Based on the transmission direction coordinates of the bearing center of gravity positions of each roller conveyor in the contact support feature record, the sampling point closest to these coordinates is found in the stress distribution record, and the stress value of this sampling point is read as the support point stress value. If the coordinates of the bearing center of gravity position are exactly between two adjacent sampling points, the weighted average of the stress values ​​of the two adjacent sampling points is taken, with the weights allocated according to the distance ratio between the bearing center of gravity position and the two sampling points. Based on the boundary of the contact imprint range of two adjacent roller conveyors, the non-contact area between the two imprint ranges is determined as the support interval area. The stress values ​​of each sampling point in the support interval area are extracted from the stress distribution record. With the support point stress values ​​of the adjacent two roller conveyors as a reference, the difference between the stress values ​​of each sampling point in the support interval area and the average stress values ​​of the support points on both sides is calculated to obtain the stress attenuation distribution of the support interval area.

[0080] Specifically, the support gap zone refers to the non-contact area between the contact imprint ranges of two adjacent roller conveyors. Within this area, the lower surface of the glass does not directly contact the roller conveyor, and stress is primarily transmitted from adjacent support points to the center through the interior of the glass. The boundary of the support gap zone is determined by the outer edges of the contact imprint ranges of two adjacent roller conveyors. One boundary is the end coordinate of the contact imprint range of the preceding roller conveyor along the transport direction, and the other boundary is the starting coordinate of the contact imprint range of the following roller conveyor along the transport direction. The area between these two boundary coordinates is the support gap zone. The stress attenuation distribution is calculated using the average stress value at both support points as a reference. For example, if the stress value at the support point of the preceding roller conveyor is σ1 and the stress value at the support point of the following roller conveyor is σ2, then the reference σ...ref It is equal to half the sum of σ1 and σ2. The stress value at the i-th sampling point within the support interval is σ. i Then the stress attenuation Δσ at that sampling point i equal to σ i Subtract σ ref A negative stress attenuation value indicates that the stress at the sampling point is lower than the reference standard, while a positive stress attenuation value indicates that the stress at the sampling point is higher than the reference standard.

[0081] In one possible implementation, based on the stress attenuation distribution, stress attenuation is extracted sequentially from the support point to the midpoint of the support interval along the transmission direction. The variation range of stress attenuation between adjacent sampling points is calculated. If the variation range between adjacent sampling points is less than a preset attenuation smoothness threshold, the stress diffusion in that section is determined to be smooth; if the variation range is greater than or equal to the attenuation smoothness threshold, the stress diffusion in that section is determined to be steep, thus obtaining a label for the attenuation smoothness of each support interval. The determination of the attenuation smoothness is based on the stress change between adjacent sampling points within the support interval. Stress attenuation is read point by point from the support point along the transmission direction towards the midpoint of the support interval. The absolute difference between the stress attenuation at the current sampling point and the stress attenuation at the previous sampling point is calculated. This absolute difference is the variation range of stress attenuation between adjacent sampling points. The variation range reflects the smoothness of stress diffusion from the support point to the middle region. A smaller variation range indicates smoother stress diffusion, while a larger variation range indicates abrupt changes in stress diffusion.

[0082] In one implementation method, based on the attenuation smoothness marker, the ratio of the number of segments determined to have smooth stress diffusion in all support intervals to the total number of support intervals is calculated, and this ratio is used as the stress distribution uniformity of the thick glass along the transmission direction. For example, a support interval may have several sampling points, numbered sequentially from the support point towards the midpoint, with several segments formed between adjacent numbered sampling points. Each segment is marked as smooth or steep based on a comparison of its variation amplitude with the attenuation smoothness threshold. The marks of all segments are summarized to form the attenuation smoothness marker for that support interval, and an overall judgment is made accordingly: if all segments are marked as smooth, the stress diffusion is considered smooth; if at least one segment is marked as steep, the stress diffusion is considered steep. Furthermore, the stress distribution uniformity is obtained by calculating the ratio of the number of support intervals determined to have smooth stress diffusion to the total number of support intervals. Understandably, the closer the stress distribution uniformity value is to one, the smoother the stress transition between the support points of each roller conveyor in thick glass, the more balanced the load distribution on the glass by each roller conveyor, and the smaller the impact of roller conveyor transmission on the stress distribution of the glass.

[0083] S106: Based on the bending arc profile and stress transition uniformity of thin glass, and the contact imprint range and stress distribution uniformity of thick glass, a support quality evaluation report for glass of different thicknesses is generated.

[0084] As one implementation method, based on the thickness type identifier, the bending arc profile curve and stress transition uniformity are summarized for thin glass, and the contact imprint range and stress distribution uniformity are summarized for thick glass. These four indicators are categorized and organized according to thickness type, forming a thin glass support quality indicator set and a thick glass support quality indicator set. The values ​​of each indicator and corresponding graphs are filled in according to a preset report template, and a support quality evaluation report containing the thickness type, indicator values, and graphs is output. The content of the support quality evaluation report is differentiated according to the thickness type of the glass being tested. The support quality indicator set for thin glass includes two indicators: bending arc profile curve and stress transition uniformity. The bending arc profile curve graphically displays the sagging deformation of the suspended area, and the stress transition uniformity numerically characterizes the smoothness of stress change from the edge to the center. The support quality indicator set for thick glass includes two indicators: contact imprint range and stress distribution uniformity. The contact imprint range reflects the effective load-bearing area between the glass and the roller conveyor, and the stress distribution uniformity reflects the balance of load distribution among the roller conveyors.

[0085] As one implementation method, the preset report template is divided into two parts: a basic information area and an indicator display area. The basic information area is filled with the glass thickness type identifier, measured thickness, roller diameter, and thickness-to-diameter ratio, where the thickness-to-diameter ratio is the ratio of the glass thickness to the roller diameter, used to assess processing suitability. The indicator display area automatically switches the displayed content according to the thickness type: for thin glass, it displays the curved profile curve and stress transition uniformity value; for thick glass, it displays the contact imprint range value and stress distribution uniformity value.

[0086] It should be noted that the support quality evaluation report is output in document form for quality monitoring personnel of the composite tempered glass production line to review, assisting in judging the rationality of the roller conveyor parameter settings. Among them, the curvature profile characterizes the degree of sag deformation of thin glass in the suspended area; the smaller the curvature, the more reasonable the roller spacing setting. The stress transition uniformity characterizes the smoothness of stress change from the support edge to the suspension center of thin glass; the higher the value, the more uniform the bending stress distribution. The contact imprint range characterizes the effective bearing area between thick glass and the roller conveyor; the larger the area, the more sufficient the support contact. The stress distribution uniformity characterizes the load distribution balance among the support points of thick glass; the higher the value, the more balanced the load on each roller. The above four indicators together reflect the support stability and load balance of the roller conveyor system for the glass.

[0087] If the technical solution of this application involves the collection, processing, or application of personal information, the relevant products have strictly complied with the requirements of the "Personal Information Protection Law of the People's Republic of China" and other laws and regulations before implementing any personal information processing activities, clearly and explicitly informing individuals of the rules for personal information processing and obtaining their independent and voluntary authorization and consent. Specifically, if the information involved is sensitive personal information, the product has not only obtained the individual's separate consent before processing, but this consent is also an explicit consent made on the basis of full knowledge. For example, in areas where personal information collection devices such as cameras are deployed, prominent and eye-catching signs have been set up to clearly inform users that entering the area is considered as consenting to the collection of their personal information; or, on the personal information processing interface (such as applications, web pages, etc.), through pop-ups, checkboxes, or active uploads, the user is required to actively authorize the process after clearly displaying key rules such as the identity of the personal information processor, the purpose of processing, the processing method, and the types of information involved.

[0088] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for monitoring the stress distribution uniformity of composite tempered glass, characterized in that, include: The glass is continuously scanned along the glass transport direction by a polarized stress scanner to collect stress values ​​at various locations on the glass surface. At the same time, the measured angle between the scanning path and the roller direction is recorded, and the glass thickness and roller diameter are measured. Based on the glass thickness, the glass to be tested is classified into thin glass or thick glass. Identify the curved arc profile of thin glass in the suspended area between adjacent rollers, extract the maximum sinking position of the suspended area and its distance from the support edge of the roller, and identify the boundary of the pressure area at the contact position between thick glass and each roller, extract the contact imprint range and the position of the load center of gravity on the lower surface of the glass at the roller support point. Based on the measured angle between the scanning path and the roller conveyor direction, the stress values ​​at various positions on the glass surface are transformed into coordinates, and the stress values ​​obtained by the oblique scanning are uniformly mapped to the glass conveying direction, forming a stress distribution record arranged along the conveying path. Based on the stress distribution records arranged along the transmission path, combined with the maximum sinking position of the overhanging area and its distance from the edge of the roller support, the stress values ​​at the maximum sinking position of the thin glass and the edge of the roller support are extracted. Based on the curved arc profile, the degree of gradual decrease of stress from the edge to the center in the overhanging area is evaluated, and the stress transition uniformity of the thin glass along the transmission direction is obtained. Based on the stress distribution records arranged along the transmission path, combined with the boundary of the pressure area, the range of the contact imprint, and the position of the bearing center of gravity, the stress values ​​of the area between each roller support point and the adjacent support point of the thick glass are extracted. The degree of attenuation of the stress diffusion from the support point to both sides is evaluated, and the stress distribution uniformity of the thick glass along the transmission direction is obtained.

2. The method for monitoring the stress distribution uniformity of composite tempered glass according to claim 1, characterized in that, The method further includes: By combining the curved profile of the thin glass with the stress transition uniformity, and the contact imprint range of the thick glass with the stress distribution uniformity, a support quality evaluation report for glass of different thicknesses is generated.

3. The method for monitoring the stress distribution uniformity of composite tempered glass according to claim 1, characterized in that, The process involves continuously scanning along the glass transport direction using a polarized stress scanner to collect stress values ​​at various locations on the glass surface. Simultaneously, the measured angle between the scanning path and the roller conveyor direction is recorded, and the glass thickness and roller conveyor diameter are measured. Based on the glass thickness, the glass is classified into thin or thick glass. The optical path difference values ​​of each sampling point along the scanning path on the glass surface are obtained. The stress value corresponding to each sampling point is calculated based on the optical path difference values ​​and the photoelastic constant of the glass material. At the same time, the relative positional relationship between the scanner movement trajectory and the glass edge is recorded. The measured angle between the scanning path and the roller arrangement direction is determined to form a stress acquisition record with position marks and angle information. According to the position marks in the stress acquisition record, measurement points are selected at intervals along the transmission direction on the glass surface. The vertical distance from the upper surface of the glass to the scanner probe at each measurement point is measured. The arithmetic mean of the vertical distance is calculated as the measured thickness. At the same time, the outer circumference diameter of the roller is measured. The measured thickness is divided by the roller diameter to obtain the thickness-to-diameter ratio. By comparing the thickness-to-diameter ratio with the thickness classification threshold, it is determined whether the glass under test belongs to the thick glass category or the thin glass category, and the thickness type identifier and corresponding stress acquisition record of the glass under test are obtained.

4. The method for monitoring the stress distribution uniformity of composite tempered glass according to claim 1, characterized in that, The process involves identifying the curved arc profile of thin glass in the suspended area between adjacent rollers, extracting the maximum sinking position of the suspended area and its distance from the roller support edge, and simultaneously identifying the boundary of the pressure area at the contact point between thick glass and each roller, extracting the contact imprint range and the bearing center position of the glass at the roller support point, including: According to the thickness type of the glass to be tested, when the thickness type is thin glass, a line laser profilometer is used to scan the lower surface of the glass along the glass transport direction to obtain the height distribution data of the suspended area between two adjacent rollers. The height of the support edges of the two rollers is used as the baseline. The sinking amount of each sampling point in the suspended area relative to the baseline is extracted. A curved arc profile curve is fitted according to the distribution pattern of the sinking amount along the transport direction. The sampling point with the largest sinking amount is located from the curved arc profile curve as the maximum sinking position. The horizontal distance between the maximum sinking position and the support edges of the two rollers is measured. When the thickness type is identified as thick glass, a pressure-sensitive thin film sensor is laid on the surface of each roller to record the pressure distribution image of the contact area between the lower surface of the glass and the roller. The pixel area with a pressure value higher than the contact threshold is identified from the pressure distribution image as the pressure area. The contact boundary is formed by connecting the outer pixels of the pressure area. The range of the contact imprint is determined according to the closed area enclosed by the contact boundary. Based on the pressure value and position coordinates of each pixel within the contact imprint range, the position coordinates are weighted and averaged using the pressure value as the weight. The weighted average of the horizontal coordinates and the weighted average of the vertical coordinates constitute the two-dimensional coordinates of the bearing center position, thus obtaining the bearing center position at each roller support point. The curved profile curve and maximum sinking position of thin glass and its horizontal distance from the roller support edge are summarized, as well as the contact imprint range and load center position of each roller of thick glass. These are stored separately according to the thickness type identifier to form the hanging deformation characteristic record of thin glass and the contact support characteristic record of thick glass.

5. The method for monitoring the stress distribution uniformity of composite tempered glass according to claim 1, characterized in that, The stress values ​​obtained from the oblique scan are uniformly mapped to the glass transport direction, forming a stress distribution record arranged along the transport path, including: Based on the original position coordinates of each sampling point in the stress acquisition record and the measured angle between the scanning path and the direction of the roller conveyor, the direction of the roller conveyor is used as the horizontal axis of the transmission direction coordinate system, and the direction perpendicular to the direction of the roller conveyor is used as the vertical axis. The original position coordinates of each sampling point are decomposed into a horizontal component along the transmission direction and a vertical component perpendicular to the transmission direction. The horizontal component is retained as the position identifier of each sampling point in the transmission direction, and the transformed position coordinates of each sampling point are obtained. Based on the transformed position coordinates, all sampling points are sorted in ascending order of the lateral component values. The sorted sampling points and their corresponding stress values ​​are then arranged sequentially according to the transmission direction to form an ordered stress value sequence along the transmission path. Based on the lateral component spacing between adjacent sampling points in the stress value sequence, linear interpolation is used to supplement the stress values ​​at intermediate positions in regions where the spacing exceeds the uniform spacing threshold, forming a stress distribution record arranged along the transmission path.

6. The method for monitoring the stress distribution uniformity of composite tempered glass according to claim 4, characterized in that, To obtain the stress transition uniformity of thin glass along the transmission direction, including: Based on the stress distribution records arranged along the transmission path and the hanging deformation characteristic records of thin glass, the transmission direction coordinates corresponding to the maximum sinking position are located, and the stress value at the transmission direction coordinates is extracted as the center stress value. At the same time, the transmission direction coordinates corresponding to the support edges of the two side rollers are located, and the stress value at the support edge is extracted as the edge stress value. The difference between the central stress value and the edge stress value is calculated as the stress drop value. Combined with the arc length from the support edge to the maximum sinking position on the curved profile curve, the stress change rate per unit arc length is calculated. The stress transition uniformity of the thin glass along the transmission direction is determined by comparing the stress change rate with the smoothness threshold.

7. The method for monitoring the stress distribution uniformity of composite tempered glass according to claim 1, characterized in that, To obtain the stress distribution uniformity of thick glass along the transmission direction, including: Based on the stress distribution records arranged along the transmission path and the contact support characteristic records of thick glass, the stress values ​​at each reference point are extracted as support point stress values, with the transmission direction coordinates of the bearing center of gravity of each roller as the reference point. Based on the boundary of the contact imprint range of two adjacent roller tracks, the non-contact area between the two imprint ranges is determined as the support interval area. The stress value of each sampling point in the support interval area is extracted from the stress distribution record. With the stress value of the support point of the adjacent two roller tracks as a reference, the difference between the stress value of each sampling point in the support interval area and the average value of the stress value of the support points on both sides is calculated to obtain the stress attenuation distribution of the support interval area. Based on the stress attenuation distribution, the stress attenuation amount is extracted sequentially from the support point to the midpoint of the support interval along the transmission direction. The change range of stress attenuation amount between adjacent sampling points is calculated. The change range is compared with the attenuation smoothness threshold to determine the attenuation smoothness of each support interval. Based on the degree of attenuation smoothness, the ratio of the number of smoothly attenuated sections to the total number of support intervals is calculated, and this ratio is used as the stress distribution uniformity of the thick glass along the transmission direction.

8. The method for monitoring the stress distribution uniformity of composite tempered glass according to claim 2, characterized in that, Generate support quality evaluation reports for glass of different thicknesses, including: Based on the thickness type, the bending arc profile curve and stress transition uniformity are summarized for thin glass, and the contact imprint range and stress distribution uniformity are summarized for thick glass. The quality index sets for thin glass support and the quality index sets for thick glass support are formed according to the thickness type. According to the preset report template, fill the template with the thickness type, various indicator values ​​and corresponding graphics, and output a support quality evaluation report containing the thickness type, various indicator values ​​and graphics.

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