Method for adjusting transverse temperature in high temperature zone of thin float glass annealing

Abstract

The present invention belongs to the field of glass production technology, and specifically relates to a method for adjusting the transverse temperature of a high-temperature zone in the annealing of thin float glass. The adjustment method comprises the following steps: after the glass leaves the F zone of the annealing furnace and before it is conveyed to the cutting station, a plurality of distance measuring devices are respectively set at the edge positions on both sides along the conveying direction of the glass ribbon, with a detection range length of h, to obtain data on the convex and concave portions of the two side edges, and calculate the arc length L of the two side edges. 主 and L 副 ; Set a set of temperature detection points at the start and end of the distance measurement. Each set of temperature detection points is arranged perpendicular to the direction of glass ribbon transmission. 主 and L 副 Corrected to the arc length L at the temperature of the middle of the glass ribbon 主修正 and L 副修正 ; Calculate L 主修正 and L 副修正 The transverse temperature of the annealing high temperature zone is adjusted by the ratio of the length h of the detection range. The adjustment method of the present invention reduces the probability of warping of thin float glass, reduces the number of plate explosions, and ensures stable production.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of glass production, and particularly relates to a method for adjusting the transverse temperature of a high-temperature zone of an annealing furnace for thin float glass. BACKGROUND

[0002] In the production of float glass, after the forming process, the glass needs to be annealed to make the stress of the glass meet the requirements, facilitate cutting and use by downstream users. In the forming process, the glass is drawn to a certain thickness by the action of the edge roll machine on the edge of the glass sheet, so the thickness of the place where the edge roll machine acts is higher than that of other positions of the glass ribbon.

[0003] In the annealing process, due to the different thicknesses of the edge and the middle of the glass sheet, the different heat dissipation environments, and the different transverse temperature parameters of the annealing furnace, the cooling speeds of the edge and the middle will also be different, causing the stress of the edge and the middle to be inconsistent. Under normal annealing conditions, the edge generally exhibits compressive stress, and the middle generally exhibits tensile stress. The edge will exhibit longitudinal "arching" under the action of the compressive stress. In the forming of the glass ribbon, the edge roll machine is pressed on both sides of the glass ribbon to draw the glass to a certain thickness. The area pressed by the edge roll machine will be cut off in the subsequent cutting process. This area is the edge of the glass sheet within a range of 300-400 mm in width. After the edge on both sides is cut off, the remaining glass sheet is called a qualified sheet. The magnitudes of the compressive stress and the tensile stress are related, i.e., the two stresses are equal in value. In production, the magnitudes of the two stresses are controlled within a certain range. If the compressive stress of the edge is too small, it will cause the "edge tightness" phenomenon commonly seen in production, which increases the risk of glass sheet explosion and is usually manifested as "vertical explosion". If the compressive stress of the edge is too large, the edge will exhibit a large longitudinal amplitude of "arching" under the action of the large compressive stress, and the edge will exhibit a clear wavy shape. In severe cases, the qualified sheet close to the edge will be warped, and the risk of glass sheet explosion will also be increased, and it is usually manifested as "horizontal explosion".

[0004] In production, in order to control the magnitude of the stress, reduce the risk of glass sheet explosion, and stabilize production, an on-line stress detector is generally used to detect the stress of the glass in real time and adjust the annealing parameters in a timely manner to stabilize the stress value within a reasonable range. This stress detector detects the stress of the glass by using the optical path difference caused by the different stresses of different parts when light passes through the glass. However, when thin glass (thickness ≤ 2 mm) is produced, the optical path difference caused by the very thin glass is very small, causing detection difficulties. Therefore, the stress of the thin glass cannot be detected by the on-line stress detector, which also causes the transverse temperature parameters of the high-temperature zone of the annealing furnace in the production of thin glass to be unable to be effectively adjusted. SUMMARY

[0005] In order to overcome the above defects, the present application aims to provide a method for adjusting the transverse temperature of the high-temperature zone of thin float glass annealing, which can monitor the stress of the edge of thin float glass, effectively adjust the transverse temperature parameters of the high-temperature zone of the annealing furnace in the production of thin float glass, and ensure stable production.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] A method for adjusting the transverse temperature of the high-temperature zone of thin float glass annealing, comprising the following steps:

[0008] After the glass exits the F zone of the annealing furnace and before it is conveyed to the cutting station, a plurality of distance measuring devices are arranged at the edge positions of the main and auxiliary sides of the glass ribbon along the direction of the glass ribbon conveying, and the detection range length is h, so as to obtain the concave-convex data of the main and auxiliary sides;

[0009] According to the concave-convex data of the main and auxiliary sides, the arc lengths L 主 and L 副 of the main and auxiliary sides are obtained.

[0010] A group of temperature detection points is arranged at the start and end positions of the distance measurement, each group of temperature detection points is arranged vertically to the direction of the glass ribbon conveying, and the glass ribbon temperature at the start and end of the detection range is obtained;

[0011] According to the glass ribbon temperature at the start and end of the detection range, the edge temperature of the main side glass ribbon, the edge temperature of the auxiliary side glass ribbon, and the middle temperature of the glass ribbon are calculated;

[0012] According to the edge temperature of the main side glass ribbon, the edge temperature of the auxiliary side glass ribbon, and the middle temperature of the glass ribbon, the arc lengths L 主 and L 副 of the main and auxiliary sides are corrected to the arc lengths L 主修正 and L 副修正 under the condition of the middle temperature of the glass ribbon.

[0013] The ratios of L 主修正 and L 副修正 to the detection range length h are calculated, and it is judged whether the ratio is between 1.02 and 1.04, and if not, the transverse temperature of the high-temperature zone in the annealing process is adjusted.

[0014] Preferably, according to the concave-convex data of the main and auxiliary sides, the arc lengths L 主 and L 副 of the main and auxiliary sides are obtained, which comprises:

[0015] (1) the data of the concave-convex fluctuation of the edge of the main operation side and the edge of the auxiliary operation side are respectively substituted into the edge fluctuation representation function fitting, the edge fluctuation representation function is: y=a+bsin[c(x-d)], the values of the correction parameters a, b, c, d are obtained;

[0016] In the formula: x represents the position of the detection point, y is the concave-convex fluctuation value detected by the distance measuring device, a, b, c, d are correction parameters;

[0017] (2) y=a+bsin[c(x-d)] is substituted into the arc length calculation formula, the arc length calculation formula is: The arc length L of the edge of the main operation side and the edge of the auxiliary operation side in the detection range is calculated 主 And L 副 ;

[0018] In the formula: y' is the derivative of y, x1 and x2 are respectively the starting point and the ending point position of the detection.

[0019] Preferably, a group of temperature detection points are arranged at the position where the distance measurement starts and ends along the direction from the main operation side to the auxiliary operation side, each group of detection points is arranged perpendicular to the glass ribbon conveying direction, the glass ribbon temperature at the starting point and the glass ribbon temperature at the ending point in the detection range are obtained, including:

[0020] The glass ribbon temperature at the starting point in the detection range is recorded as t1, t2, t3, ··· t n-1 , t n , and the glass ribbon temperature at the ending point in the detection range is recorded as t1', t2', t3', ··· t n-1 ', t n '.

[0021] Preferably, the edge temperature of the glass ribbon on the main operation side, the edge temperature of the glass ribbon on the auxiliary operation side and the middle temperature of the glass ribbon are calculated according to the glass ribbon temperature at the starting point and the glass ribbon temperature at the ending point in the detection range, including:

[0022] The edge temperature of the glass ribbon on the main operation side is t 主操边 =(t1+t1') / 2,

[0023] The edge temperature of the glass ribbon on the auxiliary operation side is t 副操边 =(t n +t n ') / 2,

[0024] The middle temperature of the glass ribbon is t 中 =[(t2+t3+···+t n-1 )+(t2'+t3'+···+t n-1 ')] / [2(n-2)].

[0025] Preferably, the arc length L of the main and sub operating side edge portion is adjusted according to the temperature condition of the middle portion of the glass ribbon. 主 and L 副 The arc length L of the middle portion of the glass ribbon is corrected according to the temperature condition of the middle portion of the glass ribbon. 主修正 and L 副修正 , comprising:

[0026] L 主修正 = L 主 *[1+α(t 中 -t 主操边 )],

[0027] L 副修正 = L 副 *[1+α(t 中 -t 副操边 )],

[0028] In the formula, α is the expansion coefficient of the glass.

[0029] Preferably, the lateral temperature of the high temperature zone of the annealing furnace is adjusted, comprising:

[0030] If the ratio of L 主修正 and L 副修正 to the length h of the detection range is higher than 1.02-1.04, the temperature of the edge portion of the high temperature zone A and B of the annealing furnace is increased or the temperature of the middle portion is decreased to reduce the lateral temperature difference; otherwise, if the ratio is lower than this range, the temperature of the edge portion of the high temperature zone A and B of the annealing furnace is decreased or the temperature of the middle portion is increased to increase the lateral temperature difference.

[0031] Preferably, if the ratio of L 主修正 and L 副修正 to the length h of the detection range is higher than the upper limit by 0.01, the lateral temperature difference is reduced by 1.7-2.2℃, and if the ratio is lower than the lower limit by 0.01, the lateral temperature difference is increased by 1.7-2.2℃,

[0032] Preferably, the high temperature zone A and B of the annealing furnace is respectively provided with seven temperature control regions, the A zone includes the central region of the A zone, the middle portion of the A zone biased to the main operating side, the middle portion of the A zone biased to the sub operating side, the transition region of the A zone biased to the main operating side, the transition region of the A zone biased to the sub operating side, the edge region of the A zone biased to the main operating side, and the edge region of the A zone biased to the sub operating side; the B zone includes the central region of the B zone, the middle portion of the B zone biased to the main operating side, the middle portion of the B zone biased to the sub operating side, the transition region of the B zone biased to the main operating side, the transition region of the B zone biased to the sub operating side, the edge region of the B zone biased to the main operating side, and the edge region of the B zone biased to the sub operating side.

[0033] If the ratio of L 主修正 to the length h of the detection range is higher than 1.02-1.04, the lateral temperature difference of the middle portion of the A zone and B zone biased to the main operating side and the edge region of the A zone and B zone biased to the main operating side is reduced; if the ratio of L 主修正The ratio of the length of the detection range h to the length of the detection range h is less than 1.02-1.04, and the lateral temperature difference between the central main operation area of the A area and the B area and the main operation edge area of the A area and the B area is increased;

[0034] If L 副修正 The ratio of the length of the detection range h to the length of the detection range h is higher than 1.02-1.04, and the lateral temperature difference between the central main operation area of the A area and the B area and the main operation edge area of the A area and the B area is increased; If L 副修正 The ratio of the length of the detection range h to the length of the detection range h is less than 1.02-1.04, and the lateral temperature difference between the central main operation area of the A area and the B area and the main operation edge area of the A area and the B area is increased;

[0035] The adjustment range of the central area of the A area and the B area is the average of the adjustment range of the central main operation area of the A area and the B area and the central auxiliary operation area of the A area and the B area.

[0036] Preferably, the length of the detection range h is 1.8-2.5m, and 8-12 distance measuring devices are arranged at the edge of the main operation side and the auxiliary operation side, respectively, and the interval between adjacent two distance measuring devices is 0.15-0.35m.

[0037] Preferably, the temperature detection point is provided with a fixed infrared temperature detector, and each group of temperature detection points is provided with 6-8 temperature detection points, and the interval between adjacent two temperature detection points is 0.55-0.85m.

[0038] The size of the stress of the glass edge and the center is affected by the lateral temperature difference of the high temperature area (i.e. the A area and the B area of the annealing kiln) during annealing. Under the current glass production process, if the lateral temperature of the high temperature area of the annealing is unreasonable, it is generally necessary to wait until the off-line detection of the cut glass sheet to judge the degree of warping; or the unreasonable lateral temperature is not found in the early stage, and only after the unreasonable lateral temperature has a great impact, the glass sheet is blown out during the walking process after the glass leaves the F area of the annealing kiln. In order to control the size of the stress, reduce the risk of glass sheet blowing, and stabilize the production, an on-line stress detector is generally used to detect the stress of the glass in real time, and adjust the annealing parameters in time to stabilize the stress value within a reasonable range. This stress detector detects the stress of the glass by using the optical path difference caused by the stress of each part when light passes through the glass. However, when producing thin glass (thickness ≤2mm), the optical path difference caused by the very thin glass is very small, which causes detection difficulty, so the stress of the thin glass cannot be detected by the on-line stress detector, which causes the high temperature area of the annealing kiln to be unable to be effectively adjusted.

[0039] The adjusting method of the present application can judge whether the transverse temperature of the high-temperature zone of the annealing lehr is reasonable after fitting, correcting and comparing the detected data after the thin glass leaves the F zone of the annealing lehr, and can accurately and timely adjust the temperature of the high-temperature zone of the annealing lehr, compared with the method of judging the transverse temperature of the high-temperature zone of the annealing lehr to be unreasonable and then adjusting it after the glass is cut and detected offline and the transverse temperature is gradually deepened due to the unreasonable transverse temperature during the walking process and then the glass plate explodes, the adjusting method of the present application has obvious advantages in timeliness, can timely and accurately adjust the transverse annealing temperature of the high-temperature zone of the annealing lehr, avoids the thin float glass from exploding during the walking process and the quality of the glass plate being affected due to the large warping amplitude, reduces the production loss, improves the product quality, ensures the stability of the production, and details are as follows:

[0040] 1. The adjusting method of the transverse temperature of the high-temperature zone of the thin float glass annealing lehr can reflect the volume difference between the edge and the middle of the glass ribbon by detecting, correcting and comparing the length of the edge with the length of the middle of the glass ribbon in the case that the on-line stress meter cannot be used in the production of the thin glass with a thickness of less than or equal to 2 mm, and then adjust the transverse temperature difference between the edge and the middle of the glass ribbon in the high-temperature zone (A zone and B zone) of the annealing lehr, reduce the volume difference caused by the different cooling speeds of the edge and the middle of the glass ribbon during the annealing process in the high-temperature zone (A zone and B zone) of the annealing lehr, effectively guide the adjustment of the transverse temperature parameters of the high-temperature zone of the annealing lehr, and ensure the production quality of the thin float glass.

[0041] 2. The thin float glass in the high-temperature zone (A zone and B zone) of the annealing lehr has different structural relaxation degrees due to the different cooling speeds of the edge and the middle, thereby causing the volume difference, and the difference causes the change of the compressive stress and the concave-convex phenomenon of the edge. In order to quantify the difference and then guide the adjustment of the temperature of the edge and the middle of the high-temperature zone, a plurality of distance measuring devices are arranged at the edge positions of the main operation side and the auxiliary operation side of the glass ribbon after leaving the F zone to detect the concave-convex degree of the edge, and the original concave-convex data are obtained. The arrangement positions of the distance measuring devices are reasonably set to obtain more accurate concave-convex data, and the curve of the more accurate concave-convex condition is drawn.

[0042] The curve reflecting the actual concave-convex conditions of the main operation side and the auxiliary operation side is fitted by using the sine function y=a+bsin[c(x-d)] respectively, the values of the correction parameters a, b, c and d of the main operation side and the auxiliary operation side in the function are obtained, and the arc length calculation formula is used to calculate the lengths L 主 and L 副 of the main operation side and the auxiliary operation side of the glass ribbon in the detection range, the lengths of the edge glass ribbon with the concave-convex characteristics of the main operation side and the auxiliary operation side in the detection range are quantified, and the volume difference between the edge and the middle is compared.

[0043] The temperature detection points at the start and end of the detection range are arranged to detect the temperature of the glass ribbon, and the temperature detection points are arranged reasonably, each group of temperature detection points is arranged perpendicular to the conveying direction of the glass ribbon, the edge temperature of the main operator side glass ribbon, the edge temperature of the vice operator side glass ribbon and the middle temperature of the glass ribbon are obtained, and the arc length L 主 and L 副 are corrected as the arc length L 主修正 and L 副修正 under the condition of the middle temperature of the glass ribbon 主修正 and L 副修正 are the lengths of the arc length L 主修正 and L 副修正 respectively, and the ratio of L 主修正 and L 副修正 to the length h of the detection range, the volume difference caused by the temperature difference between the edge and the middle of the high-temperature zone can be more truly reflected, and the quantification of the volume difference is completed.

[0044] According to the ratio of L 主修正 and L 副修正 to the length h of the detection range, according to the quantification data of the volume difference, it is judged whether the ratio is between 1.02-1.04, if not, the transverse temperature of the high-temperature zone of the annealing lehr in the annealing process is adjusted, and the temperature is adjusted accordingly, so that the temperature difference between the edge and the middle of the high-temperature zone (A zone, B zone) of the annealing lehr can be controlled within a reasonable range, the stress of the edge of the thin float glass can be monitored in time, the transverse temperature parameter of the high-temperature zone of the annealing lehr in the production of thin float glass can be effectively adjusted, and the stable production of thin float glass can be ensured.

[0045] 3. The annealing lehr is divided into A zone, B zone, C zone, D zone, RET zone, E zone and F zone, the cooling speed of A zone and B zone with higher temperature affects the structural relaxation degree of the glass ribbon, the cooling speed of the edge is faster, which causes the edge to retain a larger volume due to the weaker structural relaxation degree, and the edge and the middle are different in volume, which further causes the generation of compressive stress on the edge and tensile stress on the middle of the glass ribbon, when the glass passes through C zone, D zone, RET zone, E zone and F zone, the structure of the glass has been fixed, and has no effect on the volume difference between the edge and the middle of the glass. The temperature parameters of the high-temperature zone A zone and B zone of the annealing lehr which affect the structural relaxation degree of the glass are adjusted in the present application, and the temperature difference between the middle of the A zone and B zone temperature control region and the edge region is selected as a control index for adjustment. If the ratio of L 主修正 to the length h of the detection range is higher than 1.02-1.04, the transverse temperature difference between the middle of the A zone and B zone and the main operator edge region of the A zone and B zone is reduced; if the ratio of L 主修正The ratio of the detection range length h is lower than 1.02-1.04, the lateral temperature difference of the central main operation area of the A area and the B area and the main operation edge area of the A area and the B area is increased, the adjustment range of the central area of the A area and the B area is the average value of the adjustment range of the central main operation area of the A area and the B area and the central auxiliary operation area of the A area and the B area, the temperature of the main operation transition area of the A area and the B area and the auxiliary operation transition area of the A area and the B area has little influence on the volume difference of the edge and the center, and is not adjusted according to the detection result, which meets the needs of actual operation in the process and achieves the purpose of considering the main operation side and the auxiliary operation side in the adjustment process. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 Arrangement of high-temperature zone of annealing furnace of the application;

[0047] Figure 2 Distance measuring device and temperature detection point distribution effect drawing of the application;

[0048] Figure 3 Curves made according to the detected main operation edge concave-convex fluctuation data and detection point positions before annealing parameter adjustment and curves obtained by fitting;

[0049] Figure 4 Curves made according to the detected auxiliary operation edge concave-convex fluctuation data and detection point positions before annealing parameter adjustment and curves obtained by fitting;

[0050] Figure 5 Curves made according to the detected main operation edge concave-convex fluctuation data and detection point positions after annealing parameter adjustment and curves obtained by fitting;

[0051] Figure 6 Curves made according to the detected auxiliary operation edge concave-convex fluctuation data and detection point positions after annealing parameter adjustment and curves obtained by fitting.

[0052] In the figure: 1-glass ribbon, 2-laser distance measuring device, 3-infrared temperature detection point, 4-roller. DETAILED DESCRIPTION

[0053] The application will be further described below in combination with some specific embodiments.

[0054] Embodiment 1

[0055] A thin float glass annealing high-temperature zone lateral temperature adjustment method, comprising the following steps:

[0056] The formed glass ribbon enters the annealing furnace for annealing, and the annealing furnace is divided into A area, B area, C area, D area, RET area, E area and F area in sequence according to the advancing direction of the glass ribbon, see Figure 1 , Figure 1Only high temperature zone A and B are shown, A and B have higher temperature, the structure of glass will relax, A is called pre-annealing zone, B is called annealing zone, these two zones are called annealing high temperature zone, A and B have seven temperature control areas in horizontal direction (perpendicular to the direction of glass running), A includes A central area, A central area near main operator, A central area near vice operator, A main operator transition area, A vice operator transition area, A main operator edge area, A vice operator edge area; B includes B central area, B central area near main operator, B central area near vice operator, B main operator transition area, B vice operator transition area, B main operator edge area, B vice operator edge area; the rest of the zones are not shown, C is slow cooling zone, also includes seven temperature control areas in horizontal direction, D is to block C and RET, so that the temperature of the two zones do not affect each other, RET is rapid cooling zone, after the glass is cooled to a certain temperature, it is cooled at a faster speed, E is open zone, similar to D, separates RET and F, F is rapid cooling zone, the glass band is cooled at a faster speed; the temperature of D and E is not controlled, RET and F have three temperature control areas in horizontal direction. Each temperature control area can be set to control the temperature independently, control the horizontal temperature difference of the entire glass band, and then affect the edge stress of the glass after leaving the annealing lehr. The temperature drop speed of C, D, RET, E and F has already affected the structure of the glass, because the structure of the glass has been fixed at this time, only the temperature drop speed in the high temperature zone A and B of the annealing lehr can affect the degree of structural relaxation, thereby producing differences in volume.

[0057] The glass band has a width of 4m, enters from A zone and leaves from F zone, and completes annealing. Due to the temperature difference between the edge and the middle of the glass during annealing, the edge of the annealed glass is "arched" in the longitudinal direction due to the compressive stress, and the edge presents a wavy shape. Referring to Figure 2 After the glass leaves F zone and is conveyed to the cutting station, the glass band 1 is conveyed on the main operator side and vice operator side rollers 4, and 11 laser ranging devices 2 are arranged at the edge positions of the main operator side and vice operator side of the glass band 1 along the direction of glass band conveying, located at the upper part of the glass band 1, the detection range length (i.e. the distance between the two laser ranging devices at the start and end points of glass band conveying) is h=2m, and the adjacent two ranging devices are spaced apart by 0.2m, to obtain the concave-convex data of the main operator side and vice operator side edges, see Table 1.

[0058] Table 1: Concave-convex data

[0059] Detection point position (m) Data obtained by detection on the main operator side (m) Data obtained by detection on the sub operator side (m) 0 0.546 0.542 0.2 0.621 0.619 0.4 0.65 0.648 0.6 0.621 0.620 0.8 0.546 0.545 1.0 0.453 0.452 1.2 0.376 0.370 1.4 0.348 0.346 1.6 0.375 0.372 1.8 0.453 0.452 2.0 0.545 0.541

[0060] The measured fluctuations and temperature data are processed as follows: first, the data of the measured concave-convex fluctuations of the main and secondary operation sides are fitted with the edge fluctuation degree representation function y = a + bsin[c(x-d)], wherein x represents the position of the detection point, the first detection point is 0, and the positions of the other detection points are distances relative to the first detection point, y is the concave-convex fluctuation value detected by the distance measuring device, a, b, c, and d are correction parameters, and the values of a, b, c, and d corresponding to the edge fluctuation degree representation function of the main and secondary operation sides can be calculated according to the actually detected concave-convex fluctuation data and position data, as shown in Table 2 and Table 3. Figure 3 、 Figure 4 .

[0061] Table 2 Correction parameters

[0062] a b c d Main operator side 0.499 0.151 3.141 -0.101 Sub operator side 0.493 0.149 3.146 -0.096

[0063] Then, the edge fluctuation degree representation functions y = a + bsin[c(x-d)] of the main and secondary operation sides are substituted into the arc length calculation formula as wherein y' is the derivative of y, x1 and x2 are the starting and ending positions of detection, generally x1 is 0, and the arc lengths L of the main and secondary operation sides in the detection range are calculated 主 and L 副 , and L 主 = 2.110 m and L 副 = 2.106 m are obtained.

[0064] Referring to Figure 2 , at the positions where the laser distance measuring device starts and ends measuring, a set of infrared temperature detection points 3 is arranged along the direction from the main operation side to the secondary operation side, each set of detection points is arranged perpendicular to the glass ribbon conveying direction, each set is provided with 6 detection points, and the interval between adjacent two temperature detection points is 0.8 m. Each infrared temperature detection point is provided with a fixed infrared temperature detector to detect the temperatures of the edge and middle portions of the glass ribbon. The temperatures of the glass ribbon at the starting points in the detection range are recorded as t1, t2, t3, ··· t n-1 , t n , the temperatures of the glass ribbon at the ending points in the detection range are recorded as t1', t2', t3', ··· t n-1 ', t n ', as shown in Table 3. Among them, t1 and t1' represent the temperatures at the starting and ending points of the main operation side edge, t n and t n ' represent the temperatures at the starting and ending points of the secondary operation side edge, t2, ··· t n-1 are the temperatures of the middle portion of the glass ribbon at the starting points, and t2', ··· t n-1' is the temperature of the middle of the glass ribbon at the end point of the test. The temperature of each side edge is the average of the two points before and after, that is, the edge temperature of the main side glass ribbon is t 主操边 =(t1+t1') / 2, the edge temperature of the glass ribbon on the auxiliary side is t 副操边 =(t n +t n ') / 2, the middle temperature of the glass ribbon is the average temperature of the middle of the glass detected at the starting point and the end point, that is, t 中 =[(t2+t3+·····+t n-1 )+(t2'+t3'+·····+t n-1 ')] / [2(n-2)].

[0065] Table 3 Temperature data

[0066]

[0067]

[0068] Assume that the expansion coefficient of glass is α = 9.0*10 -6 / ℃, the arc length L of the main control side and the auxiliary control side is obtained 主 and L 副 Corrected to the arc length under the temperature condition of the middle part of the glass ribbon, that is:

[0069] L 主修正 =L 主 *[1+α(t 中 -t 主操边 )],

[0070] L 副修正 =L 副 *[1+α(t 中 -t 副操边 )],

[0071] Among them, L 主 =2.110m,t 主操边 =(t1+t1') / 2=(63+60) / 2=61.5℃,

[0072] t 中 ==[(t2+t3+·····+t5)+(t2'+t3'+·····+t5')] / [2(n-2)]=[(65+67+68+66)+

[0073] (62+63+64+63)] / [2(6-2)]=64.75°C,

[0074] L 主修正 =2.110m.

[0075] L副 = 2.106 m, t 副操边 = (t6 + t6') / 2 = (64 + 61) / 2 = 62.5℃,

[0076] t 中 = 64.75℃,

[0077] L 副修正 = 2.106 m.

[0078] Calculate the ratio of L 主修正 and L 副修正 to the length h of the detection range, and determine whether it is between 1.02-1.04. If not, adjust the lateral temperature of the high-temperature zone during the annealing process. The specific adjustment method is as follows:

[0079] If the ratio of L 主修正 to the length h of the detection range is higher than 1.02-1.04, reduce the lateral temperature difference between the middle of A and B zones and the main operation edge of A and B zones. For every 0.01 above the upper limit, reduce the lateral temperature difference by 1.7-2.2℃; if the ratio of L 主修正 to the length h of the detection range is lower than 1.02-1.04, increase the lateral temperature difference between the middle of A and B zones and the main operation edge of A and B zones. For every 0.01 below the lower limit, increase the lateral temperature difference by 1.7-2.2℃;

[0080] If the ratio of L 副修正 to the length h of the detection range is higher than 1.02-1.04, reduce the lateral temperature difference between the middle of A and B zones and the main operation edge of A and B zones. For every 0.01 above the upper limit, reduce the lateral temperature difference by 1.7-2.2℃; if the ratio of L 副修正 to the length h of the detection range is lower than 1.02-1.04, increase the lateral temperature difference between the middle of A and B zones and the main operation edge of A and B zones. For every 0.01 below the lower limit, increase the lateral temperature difference by 1.7-2.2℃;

[0081] The adjustment range of the central region of A and B zones is the average of the adjustment range of the middle of A and B zones and the middle of A and B zones. The temperature of the main operation transition region of A and B zones and the vice operation transition region of A and B zones can smoothly transition, and has little effect on the volume difference of the edge and the middle, so it is not adjusted according to the detection results, and the temperature of these regions is not adjusted.

[0082] In this embodiment, the ratio of L 主修正 to h is 1.055, and the ratio of L 副修正The ratio of A to B is 1.053, both of which are higher than the range of 1.02-1.04. In the actual detection of the products produced at this time, it is found that the qualified plate glass band slightly warps near the main and vice operators, which is not serious enough to cause the plate to explode.

[0083] The lateral temperature of the high temperature zone in the annealing process is adjusted according to the method of the present application. The lateral temperature difference is reduced by 2℃ for each 0.01 increase in the upper limit of the standard. In this detection, the ratio of the main operator side is 0.015 higher than the upper limit of the standard, and the lateral temperature difference is reduced by 3℃. The ratio of the vice operator side is 0.013 higher than the upper limit of the standard, and the lateral temperature difference is reduced by 2.6℃. The specific adjustment method is shown in Tables 4 and 5.

[0084] Table 4 Lateral temperature parameters of A and B zones before adjustment

[0085]

[0086] Table 5 Lateral temperature parameters of A and B zones after adjustment

[0087]

[0088] After a period of stabilization according to the adjusted annealing parameters, the warping of the qualified plate near the main operator edge disappears.

[0089] Verification experiment: At this time, the data of concave-convex fluctuation is re-detected according to the above method, as shown in Table 6.

[0090] Table 6 Concave-convex fluctuation data after adjustment

[0091]

[0092]

[0093] The obtained data is fitted with the edge fluctuation degree representation function y=a+bsin[c(x-d)], and the values of a, b, c, and d are obtained, as shown in Table 7 and Figure 5 、 Figure 6 .

[0094] Table 7 Corrected parameters after adjustment

[0095] a b c d Main operator side 0.499 0.101 3.143 -0.102 Sub operator side 0.497 0.102 3.147 -0.097

[0096] According to the fitted curve and the arc length calculation formula , the arc length L 主 =2.049m, L 副 =2.051m.

[0097] The measured temperature data is as shown in Table 8.

[0098] Table 8 Temperature data after correction

[0099] Detection point Measured temperature (°C) [t2] 63 [t2] 65 [t3] 67 [t4] 68 [t5] 66 [t6] 64 [t1'] 59 [t2'] 62 [t3'] 64 [t4'] 64 [t5' ] 63 [t6'] 60

[0100] The expansion coefficient a of the glass is 9.0*10 -6 / ℃, according to the detection data t 主操边 =61℃, t 副操边 =62℃, t 中 =64.875℃, the calculated L 主修正 =2.049m, L 副修正 =2.051m.

[0101] The ratio of the calculated values L 主修正 and L 副修正 to the length h=2m of the detection range is respectively 1.025 and 1.026, which is in the range of 1.02-1.04, and in the actual detection of the glass ribbon produced at this time, no warping phenomenon is found, which shows that the adjusting method of the present application can accurately monitor the stress of the edge of the thin float glass, effectively adjust the transverse temperature parameter of the high-temperature zone of the annealing lehr in the production of the thin glass, and ensure stable production.

[0102] Finally, it is to be noted that the above examples are only used to illustrate the technical solutions of the present application but not to limit the same, and other modifications or equivalent replacements to the technical solutions of the present application made by those skilled in the art should be covered in the scope of the claims of the present application as long as they do not depart from the spirit and range of the technical solutions of the present application.

Claims

1. A method for adjusting the transverse temperature of a thin float glass annealing high temperature zone, characterized in that: The steps include: After the glass leaves the F zone of the annealing furnace and before it is conveyed to the cutting station, multiple distance measuring devices are respectively set at the edges of the main and auxiliary sides of the glass ribbon along the conveying direction of the glass ribbon. The detection range length is h, and the data of the convexity and concavity of the edges of the main and auxiliary sides are obtained; According to the data of the convex and concave portions of the main control side and the auxiliary control side, the arc length L of the main control side and the auxiliary control side is obtained. 主 and L 副 ; A set of temperature detection points is set at the starting and ending positions of the distance measurement. Each set of temperature detection points is arranged perpendicular to the conveying direction of the glass ribbon to obtain the glass ribbon temperature at the starting point and the glass ribbon temperature at the end point within the detection range; Calculating the edge temperature of the main control side glass ribbon, the edge temperature of the auxiliary control side glass ribbon, and the middle temperature of the glass ribbon according to the glass ribbon temperature at the starting point and the glass ribbon temperature at the end point within the detection range; According to the edge temperature of the main control side glass ribbon, the edge temperature of the auxiliary control side glass ribbon and the middle temperature of the glass ribbon, the arc length L of the main control side and the auxiliary control side edge is 主 and L 副 Corrected to the arc length L at the temperature of the middle of the glass ribbon 主修正 and L 副修正 ; Calculate L 主修正 and L 副修正 The ratio of each to the detection range length h is determined to determine whether it is between 1.02 and 1.

04. If not, adjust the transverse temperature of the annealing high temperature zone.

2. The method for adjusting the lateral temperature of the thin float glass annealing high temperature zone according to claim 1, characterized in that: The arc length L of the main control side and the auxiliary control side is obtained based on the data of the convex and concave portions of the main control side and the auxiliary control side. 主 and L 副 ,include: (1) Substituting the measured data of the undulation of the main and auxiliary sides into the edge undulation characterization function for fitting, the edge undulation characterization function is: y = a + bsin[c(xd)], and obtaining the values ​​of the correction parameters a, b, c, d; Where: x represents the position of the detection point, y is the concave and convex value detected by the distance measuring device, and a, b, c, and d are correction parameters; (2) Substitute y=a+bsin[c(xd)] into the arc length calculation formula, which is: Calculate the arc length L of the main control side and the auxiliary control side within the detection range 主 and L 副 ; Where y' is the derivative of y, x1 and x2 are the starting and ending positions of the detection respectively.

3. The method for adjusting the transverse temperature of the thin float glass annealing high temperature zone according to claim 2, characterized in that: At the starting and ending positions of the distance measurement, a group of temperature detection points are set along the direction from the main control side to the auxiliary control side, and each group of detection points is arranged perpendicular to the conveying direction of the glass ribbon, and the glass ribbon temperature at the starting point and the glass ribbon temperature at the end point within the detection range are obtained, including: The temperature of the glass ribbon at the starting point within the detection range is recorded as t1, t2, t3, ... t n-1 , t n The glass ribbon temperature at the end of the detection range is recorded as t1', t2', t3', ·····t n-1 '、t n '.

4. The method for adjusting the transverse temperature of the thin float glass annealing high temperature zone according to claim 3, characterized in that: The calculating the edge temperature of the glass ribbon on the main control side, the edge temperature of the glass ribbon on the auxiliary control side, and the middle temperature of the glass ribbon according to the glass ribbon temperature at the starting point and the glass ribbon temperature at the end point within the detection range includes: Edge temperature of the glass ribbon on the main control side t 主操边 =(t1+t1') / 2, Edge temperature of glass ribbon on auxiliary side t 副操边 =(t n +t n ') / 2, The middle temperature of the glass ribbon t 中 =[(t2+t3+·····+t n-1 )+(t2'+t3'+·····+t n-1 ')] / [2(n-2)].

5. The method for adjusting the transverse temperature of the thin float glass annealing high temperature zone according to claim 4, characterized in that: The arc length L of the main control side and the auxiliary control side 主 and L 副 Corrected to the arc length L at the temperature of the middle of the glass ribbon 主修正 and L 副修正 , include: L 主修正 =L 主 *[1+α(t 中 -t 主操边 )], L 副修正 =L 副 *[1+α(t 中 -t 副操边 )], Where: α is the expansion coefficient of glass.

6. The method for adjusting the transverse temperature of the thin float glass annealing high temperature zone according to claim 5, characterized in that: The adjusting the transverse temperature of the annealing high temperature zone includes: If L 主修正 and L 副修正 If the ratio to the detection range length h is higher than 1.02-1.04, the edge temperature in the high-temperature zones A and B of the annealing furnace is increased or the middle temperature is decreased to reduce the lateral temperature difference; conversely, if the ratio is lower than this range, the edge temperature in the high-temperature zones A and B of the annealing furnace is decreased or the middle temperature is increased to increase the lateral temperature difference.

7. The method for adjusting the transverse temperature of the thin float glass annealing high temperature zone according to claim 6, characterized in that: The L 主修正 and L 副修正 For every 0.01 above the upper limit for the ratio to the detection range length h, the lateral temperature difference decreases by 1.7-2.2°C; for every 0.01 below the lower limit for the ratio, the lateral temperature difference increases by 1.7-2.2°C.

8. The method for adjusting the transverse temperature of the thin float glass annealing high temperature zone according to claim 7, characterized in that: The high temperature zones A and B of the annealing furnace are respectively provided with seven temperature control zones, wherein zone A includes the middle zone of zone A, the main control zone in the middle of zone A, the auxiliary control zone in the middle of zone A, the main control transition zone of zone A, the auxiliary control transition zone of zone A, the main control edge zone of zone A, and the auxiliary control edge zone of zone A; zone B includes the middle zone of zone B, the main control zone in the middle of zone B, the auxiliary control zone in the middle of zone B, the main control transition zone of zone B, the auxiliary control transition zone of zone B, the main control edge zone of zone B, and the auxiliary control edge zone of zone B; If L 主修正 The ratio of the length h of the detection range is higher than 1.02-1.04, which reduces the lateral temperature difference between the central control area of ​​area A and area B and the edge area of ​​area A and area B. 主修正 The ratio of the detection range length h is lower than 1.02-1.04, increasing the lateral temperature difference between the central control area of ​​zone A and zone B and the edge of the main control area of ​​zone A and zone B; If L 副修正 The ratio of the length h of the detection range is higher than 1.02-1.04, which reduces the lateral temperature difference between the auxiliary control area in the middle of area A and area B and the auxiliary control edge area of ​​area A and area B; if L 副修正 The ratio of the detection range length h is lower than 1.02-1.04, increasing the lateral temperature difference between the auxiliary control area in the middle of area A and area B and the auxiliary control edge area of ​​area A and area B; The adjustment range of the central area of ​​Area A and Area B is the average of the adjustment ranges of the main operation area in the middle of Area A and Area B and the auxiliary operation area in the middle of Area A and Area B.

9. The method for adjusting the transverse temperature of the thin float glass annealing high temperature zone according to claim 1, characterized in that: The length h of the detection range is 1.8-2.5m, and 8-12 distance measuring devices are respectively set at the edge positions of the main control side and the auxiliary control side, and the interval between two adjacent distance measuring devices is 0.15-0.35m.

10. The method for adjusting the transverse temperature of the thin float glass annealing high temperature zone according to claim 1, characterized in that: The temperature detection points are provided with fixed infrared thermometers, each group of temperature detection points is provided with 6-8 points, and the interval between two adjacent temperature monitoring points is 0.55-0.85m.

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