Method and device for measuring strain point and annealing point of glass

Abstract

The invention provides a method and a device for measuring a strain point and an annealing point of glass. The measuring method comprises the following steps: connecting a load to the lower end of a to-be-measured glass finished product suspended in the vertical direction; the method comprises the following steps: placing a to-be-tested glass finished product in a temperature field, so that two ends of the to-be-tested glass finished product along the vertical direction are positioned in a temperature regulation and control area, the middle part of the to-be-tested glass finished product along the vertical direction is positioned in a uniform temperature area adjacent to the temperature regulation and control area, and the uniform temperature area has a preset size L along the vertical direction; gradually increasing the temperature T of the uniform temperature area and the temperature of the temperature regulation and control area, and keeping the temperature of the uniform temperature area higher than a first preset value of the temperature of the temperature regulation and control area in the temperature increasing process, so that the two ends of the glass finished product to be tested have stable structures all the time; acquiring the elongation speed V < measured > of the to-be-measured glass finished product, and acquiring T; and obtaining a strain point Tstress and an annealing point Tannealing of the glass finished product to be detected based on the mass M, L, Vmeasured and T of the load. According to the measuring method, the technical barrier that the glass finished product cannot be directly measured is broken through.

Description

Technical Field

[0001] The present application relates to the field of glass measurement technology, and in particular to a method and device for measuring the strain point and annealing point of glass. Background Art

[0002] In the production process of glass, the annealing process is a crucial link. Its main purpose is to eliminate the internal stress of the glass caused by rapid molding and ensure product quality. During the annealing process, the temperature needs to be strictly controlled: greater than the strain point of the glass and less than the annealing point of the glass, so as to eliminate the internal stress of the glass while avoiding deformation of the glass due to excessive temperature and ensure the integrity of the glass structure. Therefore, it is necessary to accurately measure the strain point and annealing point of the glass to achieve optimization and precise control of the glass annealing process.

[0003] In the prior art, there are two methods for measuring strain point and annealing point. The first is the fiber load elongation method: this method is to heat-process the glass sample into a filament with a diameter of 0.65mm±0.1mm and a wire diameter uniformity of no more than 0.02mm, and apply a constant load at one end, and then heat the filament, and determine the strain point and annealing point by analyzing the elongation change of the filament at different temperatures. The second is the bending beam method: this method is to heat-process the glass sample into a strip sample at least 3mm thick, and place the sample in a heating furnace, apply a fixed load at both ends, so that the sample is in a bent state, and as the temperature gradually rises, the strain point and annealing point are determined by monitoring the displacement change of the center position of the sample.

[0004] However, when implementing the present invention, the inventors discovered that the existing methods for measuring strain point and annealing point require secondary heat processing of the glass into samples. When measuring ultra-thin glass (thickness 0.2mm-1.1mm), this secondary heat processing is not only complicated to prepare and inefficient, but also leads to the volatilization and loss of key components (such as lithium ions, sodium ions, etc.), as well as measurement errors caused by crystallization, affecting the accuracy of the measurement results. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a method and device for measuring the strain point and annealing point of glass, so as to directly measure the strain point and annealing point of the finished glass product.

[0006] In order to solve the above technical problems, the first aspect of the present application provides a method for measuring the strain point and annealing point of glass, comprising:

[0007] Connect the load to the lower end of the glass product to be tested which is suspended in the vertical direction;

[0008] The finished glass product to be tested is placed in a temperature field, so that both ends of the finished glass product to be tested in the vertical direction are located in the temperature control zone, and the middle part of the finished glass product to be tested in the vertical direction is located in the uniform temperature zone adjacent to the temperature control zone, and the uniform temperature zone has a preset size L in the vertical direction;

[0009] gradually increasing the temperature T of the temperature-averaging zone and the temperature of the temperature-controlling zone, and maintaining the temperature of the temperature-averaging zone higher than a first preset temperature value of the temperature-controlling zone during the heating process, so that both ends of the tested glass product always have a stable structure;

[0010] Obtain the elongation velocity V of the glass product to be tested 测 , obtain the T;

[0011] Based on the mass M of the load, the L, the V 测 and T, to obtain the strain point T of the glass product to be tested 应 and annealing point T 退 .

[0012] In some embodiments, the method of placing the glass product to be tested in a temperature field so that both ends of the glass product to be tested in a vertical direction are located in a temperature control zone includes:

[0013] Placing the glass product to be tested and the temperature field in the same sealed space, so that both ends of the glass product to be tested in the vertical direction are partially located in the temperature control zone, and the other parts are extended into the radiation heating zone;

[0014] Wherein, the temperature of the radiation heating zone is formed by the heat radiation of the uniform temperature zone and the temperature control zone.

[0015] In some embodiments, the method of maintaining the temperature of the temperature-averaging zone higher than the first preset temperature value of the temperature control zone during the heating process includes:

[0016] A first side of the temperature control zone along the vertical direction is farther away from the uniform temperature zone than a second side thereof;

[0017] During the heating process, the temperature of the temperature-averaging zone is maintained higher than the first preset value of the temperature on the second side of the temperature control zone, and the temperature of the temperature control zone gradually increases from the first side to the second side.

[0018] In some embodiments, based on the V 测 and T, to obtain the strain point T of the glass product to be tested 应 and annealing point T 退 The methods include:

[0019] Construct the viscosity and mechanical elongation speed V of the glass product to be tested 机 The relationship E:

[0020]

[0021] Wherein, η is the viscosity of the glass product to be tested, Pa·s;

[0022] M is the mass of the load, kg;

[0023] g is the acceleration due to gravity, m / s 2 ;

[0024] L is the preset size, m;

[0025] V 机 is the mechanical elongation speed of the glass product to be tested, m / s;

[0026] S is the cross-sectional area of ​​the finished glass product to be tested, m 2 ;

[0027] Based on the relationship E, the elongation velocity V corresponding to the strain point is calculated. 应 , when V 测 =V 应 When the corresponding temperature is T 应 ;

[0028] Based on the relationship E, the elongation speed V corresponding to the annealing point is calculated. 退 , when V 测 =V 退 When the corresponding temperature is T 退 .

[0029] In some embodiments, the mass M of the load is calculated as:

[0030] M=kS

[0031] Where k is the load factor per unit area, ranging from 2.5-4kg / m 2 ; For example, it can be 2.5kg / m 2 , 2.7kg / m 2 , 2.9kg / m 2 3.1kg / m 2 3.3kg / m 2 , 3.5kg / m 2 , 3.7kg / m 2 3.9kg / m 2 Or 4.0kg / m 2 etc.

[0032] The length direction of the glass product to be tested is the same as the vertical direction, and the calculation formula of S is:

[0033] S=DW

[0034] Wherein, D is the thickness of the finished glass product to be tested, m;

[0035] W is the width of the finished glass product to be tested, m.

[0036] In some embodiments, modifying the V 退 , the T 退 The corresponding corrected elongation velocity V 退 The calculation formula of ′ is:

[0037] V′ 退 =V 退 +V 均 +V 控

[0038] Among them, V 退 ' is the corrected T 退 The corresponding elongation speed, m / s;

[0039] V 均 is the expansion velocity corresponding to the current temperature of the uniform temperature zone, m / s;

[0040] V 控 is the expansion velocity corresponding to the current temperature of the temperature control zone, m / s;

[0041] Correction of the V 应 , the T 应 The corresponding corrected elongation velocity V 应 The calculation formula of ′ is:

[0042] V 应 ′=V 应 +V 均 +V 控

[0043] Among them, V 应 ' is the corrected T 应 The corresponding elongation speed, m / s.

[0044] In some embodiments, the strain point and annealing point of the standard sample are obtained by using the same measurement method as the measurement method of the finished glass product to be tested;

[0045] The following formula is used to correct the T 应 :

[0046]

[0047] Among them, T 标测1 is the strain point temperature of the standard sample measured, °C;

[0048] T 标实1is the known actual strain point temperature of the standard sample, °C;

[0049] T 应 ' is the corrected strain point temperature of the tested glass product, °C;

[0050] The following formula is used to correct the annealing point T of the glass product to be tested: 退 :

[0051]

[0052] Among them, T 标测2 is the measured annealing point temperature of the standard sample, °C;

[0053] T 标实2 is the known actual annealing point temperature of the standard sample, °C;

[0054] T 退 ' is the corrected annealing point temperature of the tested glass product, °C.

[0055] In some embodiments, the thickness of the glass to be tested is 0.2-1.1 mm, for example, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm or 1.1 mm, etc.; and / or,

[0056] The length of the glass to be tested is 120-250 mm, for example, 120 mm, 140 mm, 160 mm, 180 mm, 200 mm, 220 mm, 240 mm or 250 mm, etc.; and / or,

[0057] The width of the glass to be tested is 8-30 mm, for example, 8 mm, 12 mm, 16 mm, 20 mm, 24 mm, 28 mm or 30 mm, etc.; and / or,

[0058] The first preset value is 50-110° C., for example, 50° C., 60° C., 70° C., 80° C., 90° C., 100° C. or 110° C., etc.; and / or,

[0059] The L is 0.08-0.12m, for example, it can be 0.08m, 0.09m, 0.10m, 0.11m or 0.12m, etc.; and / or, the upper limit of the temperature in the uniform temperature zone is 1000-1500℃, for example, it can be 1000℃, 1100℃, 1200℃, 1300℃, 1400℃ or 1500℃, etc.

[0060] A second aspect of the present application provides a device for measuring a glass strain point and an annealing point, comprising:

[0061] A furnace body having a heating chamber;

[0062] A temperature-averaging tube is located in the heating chamber and connected to the furnace body, and the length direction of the temperature-averaging tube is consistent with the vertical direction;

[0063] A first heating element, connected to the outer wall of the temperature-averaging tube, for heating the temperature-averaging tube to form a uniform temperature zone inside the temperature-averaging tube;

[0064] A temperature sensor connected to the inner wall of the temperature-averaging tube and used to measure the temperature of the temperature-averaging tube;

[0065] Two second heating elements are located in the heating chamber and connected to the furnace body, and the two second heating elements are respectively located at the two ends of the temperature-averaging tube; the two second heating elements are heated to form two temperature control zones adjacent to the temperature-averaging zone; the temperature of the temperature-averaging zone can be maintained higher than the first preset value of the temperature of each temperature control zone during the heating process, so that the two ends of the finished glass product to be tested always have a stable structure.

[0066] In some embodiments, the first heating element comprises:

[0067] The first heating wire is wound around the outer wall of the temperature-averaging tube to form a plurality of first heating coils, and adjacent first heating coils are in contact with each other; the plurality of first heating coils extend continuously from one end of the temperature-averaging tube to the other end.

[0068] Compared with the prior art, the method for measuring the strain point and annealing point of glass provided in the present application provides a constant tensile force to the finished glass to be tested through the load, ensuring that the glass sample to be tested has a sufficient elongation speed V during the heating process. 测 To conduct effective measurement; use the uniform temperature zone to change the viscosity of the middle part of the glass product to be tested along the vertical direction, so that this part has a certain elongation speed V 测 Since the temperature of the temperature control zone is lower than the first preset temperature value of the uniform temperature zone, the elongation of the two ends of the glass product to be tested in the temperature control zone along the vertical direction is always avoided, ensuring that the part always has a stable structure and the accuracy of the final measurement result. At the same time, a smooth transition of the temperature between the uniform temperature zone and the temperature control zone is achieved, avoiding the glass product to be tested from being broken due to a sudden temperature change, ensuring its structural integrity, and ensuring the continuity of the measurement process; by obtaining the elongation speed V of the glass product to be tested 测 and T, determine the strain point T 应 and annealing point T 退 .

[0069] The method for measuring the strain point and annealing point of glass of the present application breaks the technical barrier of the prior art that cannot directly measure the finished glass products, and realizes the direct measurement of the finished glass. During the measurement process, since there is no need to perform secondary heat processing on the finished glass products, it not only improves the measurement efficiency but also ensures the accuracy of the measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become easy to understand. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0071] Figure 1 The structure diagram of the measuring device of the glass strain point and annealing point is schematically shown;

[0072] Figure 2 The schematic diagram of the structure of the first heating element and the second heating element of the measuring device of the glass strain point and the annealing point is shown schematically;

[0073] Figure 3 The schematic diagram of the structure of the furnace cover, the suspension parts and the temperature equalizing tube of the measuring device of the glass strain point and the annealing point is schematically shown.

[0074] Description of Figure Numbers:

[0075] 1. Furnace body; 11. Furnace cover; 111. Installation part; 12. Furnace wall; 13. Base; 2. Temperature equalizing tube; 21. Hoisting part; 3. First heating element; 4. Temperature sensor; 5. Second heating element; 6. Insulation tube; 7. Suspension part; 8. Connecting part; 9. Speed ​​sensor; 10. Load; 20. Controller; A. Finished glass product to be tested. DETAILED DESCRIPTION

[0076] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0077] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which this application belongs.

[0078] The strain point refers to the starting temperature at which the glass changes from a rigid state to a viscoelastic state. When the glass reaches the strain point, it exhibits plastic deformation ability and will elongate under the action of external force. At temperatures below the strain point, the glass behaves as a rigid solid. The annealing point refers to the optimal temperature at which the internal stress of the glass is completely released. At this temperature, the residual stress inside the glass can be completely eliminated by slow cooling, so that the glass can be restored to a state without internal stress. In the glass annealing process, by precisely controlling the temperature within the range of the strain point and the annealing point, the internal stress of the glass can be eliminated, while ensuring that the glass maintains structural integrity and performance stability during the molding and cooling process.

[0079] In order to measure the strain point and annealing point, the applicant has found that the fiber load-elongation method or the bending beam method can be used for measurement. Both methods require the finished glass product to be tested to be subjected to secondary heat processing into a sample of the required size, and then the sample is heated. However, the thickness of ultra-thin glass is in the range of 0.2-1.1 mm. Whether it is processed into filaments by the fiber load-elongation method or processed into strip samples by the bending beam method, the sample preparation process is complicated and inefficient. In addition, during the secondary heat processing, the changes in the physical and chemical properties of the finished glass product to be tested affect the accuracy of the final test results.

[0080] Based on the above considerations, in order to achieve rapid and accurate measurement of ultra-thin glass, the inventors have conducted in-depth research and designed a method for measuring the strain point and annealing point of glass. This method can directly measure the finished glass product by uniformly heating the middle part of the finished glass product in the vertical direction so that the part has a certain elongation speed V under the action of the load. 测 By keeping the temperature of the uniform temperature zone higher than the first preset temperature value of the temperature control zone during the heating process, the elongation of the two ends of the glass product to be tested in the temperature control zone along the vertical direction is avoided, which ensures that the part in the temperature control zone always has a stable structure, and ensures the accuracy of the final measurement result. At the same time, a smooth transition of the temperature between the uniform temperature zone and the temperature control zone is achieved, which avoids the glass product to be tested from being broken due to a sudden temperature change, ensures its structural integrity, and ensures the continuity of the measurement process. Then, the elongation speed V of the glass product to be tested is obtained. 测 and T, determine the strain point T 应 and annealing point T 退 .

[0081] The first aspect of the present application provides a method for measuring the strain point and annealing point of glass, comprising:

[0082] The load is connected to the lower end of the glass product to be tested which is suspended in the vertical direction.

[0083] Specifically, before the test, the surface of the finished glass product to be tested can be cleaned to ensure that the surface of the finished glass product to be tested is clean and dust-free, thereby ensuring the accuracy of the measurement result. The finished glass product to be tested is a rectangular glass, and the finished glass product to be tested can be an ultra-thin glass or an ordinary glass. When the glass to be tested is an ultra-thin glass, the thickness of the glass to be tested is 0.2-1.1 mm; and / or, the length of the glass to be tested is 120-250 mm; and / or, the width of the glass to be tested is 8-30 mm.

[0084] The upper end of the glass product to be tested can be hung on a stable hanging point, for example, a clamp or a special hook can be used to ensure the firmness of the hanging point. By hanging the glass product to be tested in the vertical direction, the sample is ensured to be in a natural vertical state, avoiding any tilt or bending, and ensuring the reliability and accuracy of the measurement results. In order to reduce lateral stress and ensure that the glass product to be tested is uniformly elongated along the length direction, the glass product to be tested can be hung along its length direction. The load can be connected to the lower end of the glass product to be tested by a wire or a special hook.

[0085] The finished glass product to be tested is placed in a temperature field so that both ends of the finished glass product to be tested along the vertical direction are located in the temperature control zone, and the middle part of the finished glass product to be tested along the vertical direction is located in the uniform temperature zone adjacent to the temperature control zone, and the uniform temperature zone has a preset size L along the vertical direction.

[0086] Specifically, the temperature field may include a temperature control zone, a uniform temperature zone, and a temperature control zone from top to bottom in the vertical direction. The suspended sample may be placed in the temperature field device; or, the finished glass product to be tested may be placed in the temperature field first, and then the glass sample to be tested may be suspended. The position is adjusted so that both ends of the finished glass product to be tested in the vertical direction are located in the temperature control zone, and the middle of the finished glass product to be tested in the vertical direction is located in the uniform temperature zone adjacent to the temperature control zone. Both temperature control zones are adjacent to the uniform temperature zone to avoid sudden temperature drops and ensure the structural integrity of the finished glass product to be tested.

[0087] The preset size determines the uniformity of the heating of the glass product to be tested in the uniform temperature zone, thus affecting its V 测 L can be set within the range of 0.08-0.12m to ensure that the finished glass product to be tested is in the best temperature uniformity and stable conditions during the test, thereby ensuring consistent elongation behavior and accuracy of measurement results, and enhancing the scientificity and reliability of the measurement.

[0088] In some embodiments, the method of placing the glass product to be tested in a temperature field so that both ends of the glass product to be tested in a vertical direction are located in a temperature control zone includes:

[0089] Placing the glass product to be tested and the temperature field in the same sealed space, so that both ends of the glass product to be tested in the vertical direction are partially located in the temperature control zone, and the other parts are extended into the radiation heating zone;

[0090] Wherein, the temperature of the radiation heating zone is formed by the heat radiation of the uniform temperature zone and the temperature control zone.

[0091] Specifically, the temperature field may include a radiation heating zone, a temperature control zone, a uniform temperature zone, a temperature control zone, and a radiation heating zone from top to bottom in the vertical direction. The radiation heating zone is located at the top and bottom of the temperature field, providing additional heat through thermal radiation, thereby reducing energy consumption. This multi-layer temperature field structure ensures a smooth temperature transition during the test, avoids stress concentration or the risk of cracking of the finished glass product to be tested due to sudden temperature changes, and ensures its structural integrity.

[0092] The temperature T of the temperature-averaging zone and the temperature of the temperature control zone are gradually increased, and during the heating process, the temperature of the temperature-averaging zone is kept higher than a first preset temperature value of the temperature control zone, so that both ends of the tested glass product always have a stable structure.

[0093] Specifically, when heating up, the temperature of the uniform temperature zone can be increased first, and after a preset time interval, the temperature of the temperature control zone can be increased, and then the temperature heating process of the uniform temperature zone and the temperature control zone can be gradually completed. During the heating process of the two zones, the temperature of the uniform temperature zone is always kept higher than the first preset value of the temperature control zone. A proportional integral differential controller can be used to accurately control the temperature to ensure that the temperature of the temperature control zone does not exceed the first preset value of the uniform temperature zone.

[0094] The first preset value may be 50-110° C., so that when the uniform temperature zone is at the annealing point T 退 When the temperature of the temperature control zone is always lower than the strain point T 应 , always keep the two ends of the glass product to be tested with a stable structure, thereby ensuring the accuracy of the measurement results. In addition, this heating method can also achieve a smooth transition of the temperature in the uniform temperature zone and the temperature control zone, avoiding sample breakage caused by sudden temperature changes.

[0095] The upper limit of the temperature in the uniform temperature zone can be 1000-1500°C to cover a wider range of glass material testing requirements and ensure that the strain point T of the finished glass product to be tested can be accurately reflected during the test process. 应 and annealing point T 退 , improving the comprehensiveness and accuracy of the test, while ensuring that the finished glass product to be tested remains intact throughout the testing process.

[0096] The temperature control area may be an area with uniform temperature, that is, a uniform temperature distribution is maintained in the area. Alternatively, in some embodiments, the method of maintaining the temperature of the uniform temperature area higher than the first preset temperature value of the temperature control area during the heating process includes:

[0097] A first side of the temperature control zone along the vertical direction is farther away from the uniform temperature zone than a second side thereof;

[0098] During the heating process, the temperature of the temperature-averaging zone is maintained higher than the first preset value of the temperature on the second side of the temperature control zone, and the temperature of the temperature control zone gradually increases from the first side to the second side.

[0099] Specifically, the temperature control zone can be a region with a temperature gradient, wherein the temperature gradually decreases from the second side close to the uniform temperature zone to the first side away from the uniform temperature zone, further realizing a smooth temperature transition, avoiding the influence of the temperature surroundings on the finished glass product to be tested, and enhancing the integrity of the finished glass product to be tested.

[0100] Obtain the elongation velocity V of the glass product to be tested 测 , obtain the T.

[0101] Specifically, when the temperature in the uniform temperature zone starts to rise, V 测 Alternatively, T can be acquired synchronously when the temperature in the uniform temperature zone rises, and V can be acquired in real time after T rises to a preset temperature, such as 300°C, 350°C, or 400°C. 测 . V 测 It can be obtained by a speed sensor or a video measurement system, and T can be obtained by a thermocouple or a resistance temperature detector.

[0102] Based on the mass M of the load, the L, the V 测 and T, to obtain the strain point T of the glass product to be tested 应 and annealing point T 退 .

[0103] Based on the V 测 and T, to obtain the strain point T of the glass product to be tested 应 and annealing point T 退 The methods include:

[0104] Construct the viscosity and mechanical elongation speed V of the glass product to be tested 机 The relationship E:

[0105]

[0106] Wherein, η is the viscosity of the glass product to be tested, Pa·s;

[0107] M is the mass of the load, kg;

[0108] g is the acceleration due to gravity, m / s 2 ;

[0109] L is the preset size, m;

[0110] V 机 is the mechanical elongation speed of the glass product to be tested, m / s;

[0111] S is the cross-sectional area of ​​the finished glass product to be tested, m 2 ;

[0112] Based on the relationship E, the elongation velocity V corresponding to the strain point is calculated. 应 , when V 测 =V 应 When the corresponding temperature is T 应 ;

[0113] Based on the relationship E, the elongation speed V corresponding to the annealing point is calculated. 退 , when V 测 =V 退 When the corresponding temperature is T 退 .

[0114] Specifically, the weight of the load is crucial during the test: if the load is too light, it may not generate enough stress to induce strain in the glass sample, resulting in insignificant measurement results; if the load is too heavy, it may cause excessive deformation or even breakage of the sample, affecting the effectiveness and safety of the experiment. Before the formal measurement, a pre-load test can be performed to verify whether the weight of the selected load is appropriate; or, in order to ensure the controllability of the measurement conditions and the reliability of the results, the mechanical elongation speed V of the finished glass to be tested can be controlled. 机 and strain, simulating actual application conditions, improving measurement accuracy, and achieving standardized measurement. The required load mass M can be calculated before measurement.

[0115] The calculation formula of the mass M of the load is:

[0116] M=kS

[0117] Where k is the load factor per unit area, ranging from 2.5-4kg / m 2 ;

[0118] The length direction of the glass product to be tested is the same as the vertical direction, and the calculation formula of S is:

[0119] S=DW

[0120] Wherein, D is the thickness of the finished glass product to be tested, m;

[0121] W is the width of the finished glass product to be tested, m.

[0122] In order to ensure the accuracy of the load weight and the accuracy of the final measurement results, the weight of the load can be accurately measured using an analytical balance before measurement, or a standard weight of known mass can be used as the load.

[0123] The viscosity value corresponding to the annealing point is 10 13.5 Pa·s. Substituting the viscosity value corresponding to the annealing point and the M into the relational formula E, we can obtain:

[0124]

[0125] Among them, g can be taken as an approximate value of 9.81m / s 2 , k value and L value are substituted according to the specific conditions in the actual measurement process, and V can be calculated. 退 .

[0126] The viscosity value corresponding to the strain point is 10 12 Pa·s. Substituting the viscosity value corresponding to the strain point and the M into the relational formula E, we can obtain:

[0127]

[0128] Among them, g can be taken as an approximate value of 9.81m / s 2 , k value and L value are substituted according to the specific conditions in the actual measurement process, and V can be calculated. 应 .

[0129] In the above calculation, V 应 is the strain point T 应 The corresponding V 机 , V 退 is the annealing point T 退 The corresponding V 机 .

[0130] Since the elongation velocity V in the actual measurement 测 Including mechanical elongation speed V 机 , expansion velocity V in uniform temperature zone 均 and the expansion velocity V in the temperature control zone 控 ,Right now:

[0131] V 测 =V 机 +V 均 +V 控

[0132] In order to eliminate the influence of the expansion of the glass product to be measured on the result during the measurement process, the V 退 and V 应 .

[0133] The T 退 The corresponding corrected elongation velocity V 退 The calculation formula of ′ is:

[0134] V′ 退 =V 退 +V 均 +V 控

[0135] Among them, V 退 ' is the corrected T 退 The corresponding elongation speed, m / s;

[0136] V 均 is the expansion velocity corresponding to the current temperature of the uniform temperature zone, m / s;

[0137] V 控 is the expansion velocity corresponding to the current temperature of the temperature control zone, m / s;

[0138] That is, when V 测 =V 退 ', the corresponding temperature is T 退 .

[0139] The T 应 The corresponding corrected elongation velocity V 应 The calculation formula of ′ is:

[0140] V 应 ′=V 应 +V 均 +V 控

[0141] Among them, V 应 ' is the corrected T 应 The corresponding elongation speed, m / s.

[0142] That is, when V 测 =V 应 ', the corresponding temperature is T 应 .

[0143] Specifically, V 均 It can be calculated by the following formula:

[0144]

[0145] Among them, α 均 is the expansion coefficient of the glass product to be tested corresponding to the current temperature of the uniform temperature zone, 1 / °C;

[0146] is the rate of change of the temperature in the uniform temperature zone with time, ℃ / s.

[0147] α 均 The value of can be obtained by consulting the material manual or experimental determination; It can be measured in real time by a temperature sensor, or set according to a heating program.

[0148] When V 控 When the temperature is uniform, V 控 It can be calculated by the following formula:

[0149]

[0150] Among them, L 控 is the size of the finished glass product to be tested in the temperature control zone, m;

[0151] α 控 is the expansion coefficient of the glass product to be tested corresponding to the current temperature of the temperature control zone, 1 / °C;

[0152] is the rate of change of the temperature in the temperature control zone over time, ℃ / s.

[0153] α 控 The value of can be obtained by consulting the material manual or experimental determination; It can be measured in real time by a temperature sensor, or set according to a heating program.

[0154] When V 控 When it is a region with a temperature gradient, the temperature control area can be divided into n segments along the vertical direction, and the expansion velocity V of the i-th segment is 控，i It can be calculated by the following formula:

[0155]

[0156] Among them, L 控,i is the size of the finished glass product to be tested in the i-th section of the temperature control zone, m;

[0157] α 控,i is the expansion coefficient of the glass product to be tested corresponding to the current temperature of the i-th section of the temperature control zone, 1 / °C;

[0158] is the rate of change of the temperature in the i-th section of the temperature control zone over time, °C / s.

[0159] α 控,i The value of can be obtained by consulting the material manual or experimental determination; It can be measured in real time by a temperature sensor, or set according to a heating program.

[0160] Total expansion velocity V 控It can be calculated according to the following formula:

[0161]

[0162] In some embodiments, in order to improve the measurement accuracy and ensure the reliability of the experimental results, the strain point and annealing point of the standard sample can be obtained by using the same measurement method as the measurement method of the finished glass to be tested;

[0163] The following formula is used to correct the T 应 :

[0164]

[0165] Among them, T 标测1 is the strain point temperature of the standard sample measured, °C;

[0166] T 标实1 is the known actual strain point temperature of the standard sample, °C;

[0167] T 应 ' is the corrected strain point temperature of the tested glass product, °C;

[0168] The following formula is used to correct the annealing point T of the glass product to be tested: 退 :

[0169]

[0170] Among them, T 标测2 is the measured annealing point temperature of the standard sample, °C;

[0171] T 标实2 is the known actual annealing point temperature of the standard sample, °C;

[0172] T 退 ' is the corrected annealing point temperature of the tested glass product, °C.

[0173] Specifically, the standard sample can be obtained by purchasing from the market. By introducing the actual data of the standard sample for correction, the strain point T of the glass product to be tested can be determined more accurately. 应 and annealing point T 退 .

[0174] Compared with the prior art, the method for measuring the strain point and annealing point of glass provided in the present application provides a constant tensile force to the finished glass to be tested through the load, ensuring that the glass sample to be tested has a sufficient elongation speed V during the heating process. 测 To conduct effective measurement; use the uniform temperature zone to change the viscosity of the middle part of the glass product to be tested along the vertical direction, so that this part has a certain elongation speed V 测Since the temperature of the temperature control zone is lower than the first preset temperature value of the uniform temperature zone, the elongation of the two ends of the glass product to be tested in the temperature control zone along the vertical direction is always avoided, ensuring that the part always has a stable structure and the accuracy of the final measurement result. At the same time, a smooth transition of the temperature between the uniform temperature zone and the temperature control zone is achieved, avoiding the glass product to be tested from being broken due to a sudden temperature change, ensuring its structural integrity, and ensuring the continuity of the measurement process; by obtaining the elongation speed V of the glass product to be tested 测 and T, determine the strain point T 应 and annealing point T 退 .

[0175] The method for measuring the strain point and annealing point of glass of the present application breaks the technical barrier of the prior art that cannot directly measure finished glass products, and realizes the measurement of finished glass. During the measurement process, since there is no need to perform secondary heat processing on the finished glass products, it not only improves the measurement efficiency but also ensures the accuracy of the measurement results.

[0176] Example 1

[0177] The purchased standard sample with a thickness of 0.5 mm, a length of 150 mm, and a width of 20 mm is used as the finished glass product to be tested. The known strain point of the standard sample is 520°C, and the known annealing point of the standard sample is 565°C;

[0178] Hang the finished glass product to be tested in a vertical direction, wherein the length direction of the finished glass product to be tested is consistent with the vertical direction;

[0179] Select k value as 2.5kg / m 2 Load and hang it at the lower end of the finished glass product to be tested;

[0180] Place the finished glass product to be tested in the temperature field, so that both ends of the finished glass product to be tested in the vertical direction are located in the temperature control zone, and the middle of the finished glass product to be tested in the vertical direction is located in the uniform temperature zone adjacent to the temperature control zone, the upper temperature limit of the uniform temperature zone is 1000° C., and the uniform temperature zone is 0.08 m in the vertical direction;

[0181] Calculate V by using the relation E 应 and V 退 ;

[0182] gradually increasing the temperature T of the temperature-averaging zone and the temperature of the temperature-controlling zone, and maintaining the temperature of the temperature-averaging zone 50° C. higher than the temperature of the temperature-controlling zone during the temperature-raising process;

[0183] Real-time acquisition of the elongation velocity V of the glass product to be tested 测 , obtain the T;

[0184] Get the strain point T of the finished glass to be tested应 and annealing point T 退 ;

[0185] Record the time t required for the entire measurement process.

[0186] Example 2

[0187] The difference between Example 2 and Example 1 is that the k value is selected to be 3.0 kg / m 2 load.

[0188] Example 3

[0189] The difference between Example 3 and Example 1 is that the k value is selected to be 4kg / m 2 load.

[0190] Example 4

[0191] The difference between Example 4 and Example 1 is that the uniform temperature zone is 0.1 m in the vertical direction.

[0192] Example 5

[0193] The difference between Example 5 and Example 1 is that the uniform temperature zone is 0.12 m in the vertical direction.

[0194] Example 6

[0195] The difference between Example 6 and Example 1 is that during the heating process, the temperature of the uniform temperature zone is maintained at 70° C. higher than the temperature of the temperature control zone.

[0196] Example 7

[0197] The difference between Example 7 and Example 1 is that during the heating process, the temperature of the uniform temperature zone is maintained to be 110° C. higher than the temperature of the temperature control zone.

[0198] Example 8

[0199] The difference between Example 8 and Example 1 is that V 应 Corrected to V 应 ′; V 退 Corrected to V 退 ′.

[0200] Comparative Example 1

[0201] The difference between Comparative Example 1 and Example 1 is that the conventional fiber elongation under load method is used for measurement.

[0202] Comparative Example 2

[0203] The difference between Comparative Example 2 and Example 1 is that the conventional bending beam method is used for measurement.

[0204] Table 1 Measurement data of Examples 1-7 and Comparative Examples 1-2

[0205] Example <![CDATA[T 应 (℃)]]> <![CDATA[T 应 Absolute Error]]> <![CDATA[T 退 (℃)]]> <![CDATA[T 退 Absolute Error]]> t(hours) Example 1 516 4 554 11 2.3 Example 2 518 2 555 10 2.3 Example 3 515 5 553 12 2.2 Example 4 519 1 557 8 2.3 Example 5 523 3 570 5 2.3 Example 6 525 5 574 9 3.3 Example 7 523 3 572 7 2.8 Example 8 519 1 564 1 2.4 Comparative Example 1 530 10 583 18 14.5 Comparative Example 2 509 11 545 20 13.2

[0206] It can be concluded from Examples 1-7 and Comparative Examples 1-2 that the method for measuring the annealing point and strain point of the glass of the present application, the measured T 应 The absolute error is ±5°C, and the measured T 退 The absolute error is ±12°C, which is more accurate than Comparative Examples 1-2. The entire measurement process of the measurement method of the present application is estimated to be 2.2-3.3 hours, which is much shorter than the measurement time of Comparative Examples 1-2, greatly improving the measurement efficiency.

[0207] It can be concluded from Examples 1-7 that a load k value that is too large or too small will affect the accuracy of the final measurement, and thus the load k value needs to be controlled within a reasonable range; a preset size L that is too large or too small will affect the accuracy of the final measurement, and thus L needs to be controlled within a reasonable range; a first preset value that is too large or too small will affect the accuracy of the final measurement, and thus L needs to be controlled within a reasonable range.

[0208] It can be concluded from Examples 1-8 that V 应 Corrected to V 应 ′,V 退 Corrected to V 退 ', the accuracy of the measurement method of the present application can be improved.

[0209] like Figure 1 and Figure 2 As shown, the second aspect of the present application provides a device for measuring the strain point and annealing point of glass, comprising:

[0210] A furnace body 1 having a heating chamber;

[0211] A temperature-averaging tube 2 is located in the heating chamber and connected to the furnace body 1, and the length direction of the temperature-averaging tube 2 is consistent with the vertical direction;

[0212] A first heating element 3 is connected to the outer wall of the temperature-averaging tube 2 and is used to heat the temperature-averaging tube 2 so as to form a uniform temperature zone inside the temperature-averaging tube 2;

[0213] A temperature sensor 4 is connected to the inner wall of the temperature-averaging tube 2 and is used to measure the temperature of the temperature-averaging tube 2;

[0214] Two second heating elements 5 are located in the heating chamber and connected to the furnace body 1, and the two second heating elements 5 are respectively located at the two ends of the temperature-equalizing tube 2; the two second heating elements 5 are heated to form two temperature control zones adjacent to the temperature-equalizing zone; the temperature of the temperature-equalizing zone can be maintained higher than the first preset value of the temperature of each temperature control zone during the heating process, so that the two ends of the glass product A to be tested always have a stable structure.

[0215] Specifically, the furnace body 1 is the core shell of the entire measuring device, which is used to provide a heating environment to form a temperature field. The furnace body 1 can be made of a heat-insulating material, such as aluminum silicate fiber or microporous calcium silicate board. The furnace body 1 has an opening connected to the heating chamber, and the opening is used to take the finished glass product A to be tested.

[0216] The temperature-averaging tube 2 can form a uniform temperature zone inside when heated. A groove matching the shape of the temperature-averaging tube 2 can be provided on the inner wall of the furnace body 1, and the temperature-averaging tube 2 can be embedded into the furnace body 1 through the groove.

[0217] The temperature-averaging tube 2 has a preset dimension L in the vertical direction, and L is 0.08-0.12m to ensure the accuracy of the final measurement result. The temperature-averaging tube 2 can be made of a material with good thermal conductivity. The material of the temperature-averaging tube 2 can be controlled according to the upper temperature limit of the average temperature required for measurement. For example, when the upper temperature limit of the temperature-averaging zone needs to reach 1000°C, it can be made of a copper-based alloy material to reduce production costs while ensuring the upper temperature limit; when the upper temperature limit of the temperature-averaging zone needs to reach 1500°C, it can be made of a platinum-based alloy.

[0218] The first heating element 3 is used to heat the temperature-equalizing tube 2. The first heating element 3 may include a plurality of silicon carbon rods, the length direction of the silicon carbon rods is the same as the length direction of the temperature-equalizing tube 2, and the plurality of silicon carbon rods are arranged at equal intervals along a circular trajectory on the outer wall of the temperature-equalizing tube 2. A high-temperature resistant clamp or a high-temperature resistant fixture may be used to connect the plurality of carbon silicon rods to the outer wall of the temperature-equalizing tube 2. The high-temperature resistant clamp or the high-temperature resistant fixture may be made of stainless steel or ceramic to ensure a stable connection under high temperature conditions. At this time, the groove of the furnace body 1 needs to be adapted to the size of the plurality of carbon silicon rods; or, a plurality of grooves may be opened at equal intervals along a circular trajectory on the outer wall of the temperature-equalizing tube 2, and the length direction of the grooves is the same as the vertical direction. Each carbon silicon rod is embedded in the temperature-equalizing tube 2 through a groove, and is fixed and sealed with a high-temperature resistant material (such as ceramic fiber, mica sheet, etc.) to ensure that its position is stable and does not affect heat transfer, reduce heat loss and improve heat conduction efficiency.

[0219] The furnace body 1 has a wiring hole. The measuring device may also include a plug and a multi-core cable, which passes through the wiring hole and is sealed and connected to the furnace body 1 to ensure that heat does not leak and external gas cannot enter the heating chamber. Each carbon silicon rod can be electrically connected to the first end of an alumina ceramic terminal of the multi-core cable; the second ends of the multiple alumina ceramic terminals of the multi-wire cable are all connected to the plug, and the plug is used to connect to an external power supply to achieve simultaneous heating of multiple carbon silicon rods, ensure the uniformity of the temperature in the temperature zone, and ensure the accuracy of the final measurement result.

[0220] The temperature sensor 4 is used to measure the temperature of the uniform temperature zone. The temperature sensor 4 can be a thermocouple or an optical fiber temperature sensor, wherein a thermocouple is preferred to reduce production costs. The thermocouple can be connected to the inner wall of the uniform temperature tube 2 by welding or embedding to ensure the accuracy of the temperature measurement in the uniform temperature zone. The temperature sensor 4 may include one or more thermocouples. When there are multiple thermocouples, multiple thermocouples may be arranged at equal intervals along the length direction of the inner wall of the uniform temperature tube 2 to comprehensively monitor the temperature distribution in the uniform temperature zone. The measuring device may include a signal acquisition system, and the thermocouple may be connected to the signal acquisition system through an alumina ceramic terminal.

[0221] The second heating element 5 is used to provide heat to the temperature control zones at both ends of the temperature equalizing tube 2, forming a zone adjacent to the temperature equalizing zone but with a lower temperature. The connection method of the second heating element 5 can refer to the first heating element 3, and the selection method of the second heating element 5 can refer to the first heating element 3.

[0222] During the measurement process, a weight of known weight can be used as the load 10. The upper and lower ends of the glass product A to be tested can be provided with through holes penetrating in the thickness direction, and the load 10 can be mounted on the lower end of the glass product A to be tested through the through holes. A metal rod or a ceramic rod can be passed through the through hole at the upper end of the glass product A to be tested, and the metal rod or the ceramic rod can be mounted on the outer wall of the furnace body 1 to achieve the suspension of the glass product A to be tested. During the suspension process, it is necessary to ensure that the distance between the glass product A to be tested and the inner wall of the temperature equalizing tube 2 is equal everywhere to ensure uniform heating. An external speed measuring sensor can be used to measure the speed.

[0223] Compared with the prior art, the measuring device for the strain point and annealing point of the glass provided in the present application is connected to the outer wall of the temperature-equalizing tube 2 through the first heating element 3, thereby providing a temperature-equalizing zone with uniform temperature for the glass product A to be measured. The heating of the temperature-equalizing zone realizes the change of the elongation speed of the glass product A to be measured; by connecting the temperature sensor 4 to the inner wall of the temperature-equalizing tube 2, the accuracy of the temperature measurement of the temperature-equalizing zone is guaranteed; by arranging two second heating elements 5 at both ends of the temperature-equalizing tube 2, an area adjacent to the temperature-equalizing zone but with a lower temperature is formed, thereby ensuring that the glass product A to be measured in the temperature control zone always has a stable structure, ensuring the accuracy of the final measurement result, and realizing a smooth transition of the temperature between the temperature-equalizing zone and the temperature control zone, thereby avoiding the glass product A to be measured from being broken due to a sudden temperature change, ensuring its structural integrity, and ensuring the continuity of the measurement process.

[0224] The measuring device for the strain point and annealing point of the glass of the present application breaks the technical barrier in the prior art that it is impossible to directly measure the finished glass products, and realizes the direct measurement of the finished glass. During the measurement process, since there is no need to perform secondary heat processing on the finished glass products, it not only improves the measurement efficiency but also ensures the accuracy of the measurement results.

[0225] like Figure 1 and Figure 2 As shown, in some embodiments, the first heating element 3 includes:

[0226] The first heating wire is wound around the outer wall of the temperature-averaging tube 2 to form a plurality of first heating coils, and adjacent first heating coils are in contact with each other; the plurality of first heating coils extend continuously from one end of the temperature-averaging tube 2 to the other end.

[0227] Specifically, a plurality of first heating coils are formed by continuously winding the first heating wire, extending from the first end to the other end of the temperature-equalizing tube 2, and each heating coil is closely adjacent and in contact with each other to ensure that the heat can be evenly distributed along the entire temperature-equalizing tube 2. At this time, the groove of the furnace body 1 needs to be adapted to the size of the plurality of first heating coils; the first heating wire can be connected to an external power source through a mineral insulated cable to ensure the reliability and safety of current transmission. The mineral insulated cable can be sealed and connected to the wiring hole of the furnace body 1 to maintain the stability and safety of the heating environment. The first heating wire can be a nickel-chromium alloy heating wire or an iron-chromium-aluminum alloy heating wire.

[0228] By adopting a method of multiple continuous and adjacent first heating rings formed by winding the first heating wire, efficient energy transfer is achieved while ensuring the temperature uniformity and stability in the uniform temperature zone, providing strong support for the accurate measurement of the glass strain point and annealing point.

[0229] like Figure 1 and Figure 2 As shown, in some embodiments, it also includes:

[0230] The heat-insulating tube 6 is located in the heating chamber and connected to the furnace body 1 . The first heating element 3 is located between the heat-insulating tube 6 and the temperature-averaging tube 2 . The heat-insulating tube 6 and the temperature-averaging tube 2 are coaxial.

[0231] Specifically, the insulation tube 6 is used to provide additional insulation protection for the temperature-averaging tube 2 in the heating chamber, ensuring that the heat is concentrated in the temperature-averaging zone, reducing the conduction of heat to the outside, and ensuring the uniformity of the temperature in the temperature-averaging zone, thereby improving the accuracy and efficiency of temperature control.

[0232] The insulation tube 6 can be embedded in the inner wall of the furnace body 1 to ensure a stable connection in a high temperature environment. The insulation tube 6 can be made of an efficient insulation material, such as ceramic or alumina, to ensure long-term stability and reliability. The length of the insulation tube 6 can be the same as the length of the temperature-averaging tube 2, and the temperature-averaging tube 2 is located inside the insulation tube 6 as a whole to ensure the uniformity of the temperature of the temperature-averaging zone inside the temperature-averaging tube 2.

[0233] like Figure 3 As shown, in some embodiments, it also includes:

[0234] A plurality of hanging members 7, wherein first ends of the plurality of hanging members 7 are connected to the furnace body 1;

[0235] The end surface of the first end of the temperature-averaging tube 2 is provided with a plurality of hoisting parts 21 , and the plurality of hoisting parts 21 are arranged at equal intervals along a circular track, and the second end of each of the suspension members 7 is connected to one of the hoisting parts 21 .

[0236] Specifically, the second end of the suspension member 7 is used to cooperate with the hoisting portion 21 to realize the hoisting of the temperature-averaging tube 2. The suspension member 7 is strip-shaped. The first end of the suspension member 7 can be located in the heating chamber and connected to the inner wall of the furnace body 1, or the first end of the suspension member 7 can be located outside the heating chamber and connected to the outer wall of the furnace body 1. The first end of the suspension member 7 can be connected to the furnace body 1 by bolts or clamping. The first ends of multiple suspension members 7 can be arranged along a circular trajectory.

[0237] The second end of the hanging member 7 may be provided with a pin shaft, and the hanging part 21 may be a pin hole adapted to the pin shaft, and the pin shaft may be inserted into the pin hole and fixed with a pin to ensure a stable connection between the hanging member 7 and the hanging part 21; or, the second end of the hanging member 7 may be provided with a hook, and the hanging part 21 may be a buckle adapted to the hook, so as to facilitate the subsequent maintenance and repair of the temperature-averaging tube 2. The hanging member 7 may be made of a stainless steel chain, a steel wire rope, or a ceramic fiber rope.

[0238] In some embodiments, it also includes:

[0239] Two insulation rings (not shown in the figure), both ends of the temperature-averaging tube 2 are provided with fixing parts, the two insulation rings are respectively connected to the end faces of both ends of the temperature-averaging tube 2 through the fixing parts, and the insulation rings are connected to the inner wall of the insulation tube 6;

[0240] The first heating element 3 is spaced apart from the thermal insulation tube 6 , and the thermal insulation ring has an expansion joint.

[0241] Specifically, the insulation ring is used to connect the temperature-equalizing tube 2 and the furnace body 1. The insulation ring not only provides additional insulation protection, but also enhances the stability of the connection of the temperature-equalizing tube 2. The material selection of the insulation ring can refer to the insulation tube 6.

[0242] The end faces of both ends of the temperature-equalizing tube 2 may be provided with embedding grooves, and the heat-insulating ring may be embedded in the end face of the temperature-equalizing tube 2 through the embedding grooves, and the embedding grooves form a fixing portion; or, the end faces of both ends of the temperature-equalizing tube 2 may be provided with threaded holes, and the heat-insulating ring may be threadedly connected to the threaded holes through bolts, and the threaded holes form a fixing portion. The heat-insulating ring may be connected to the inner wall of the heat-insulating tube 6 through bolts; or, a graphite gasket may be provided outside the heat-insulating ring, and the heat-insulating ring may be interference-fitted with the heat-insulating tube 6 through the graphite gasket.

[0243] The expansion joint is used to compensate for the thermal expansion of the temperature-averaging tube 2 during the heating process, and to prevent the insulation ring from applying unnecessary mechanical stress to the temperature-averaging tube 2 due to temperature changes, thereby protecting the temperature-averaging tube 2 and its internal components. The expansion joint can be a V-shaped or zigzag gap to ensure that the insulation ring can freely expand and contract to adapt to the thermal expansion of the temperature-averaging tube 2.

[0244] The first heating element 3 is spaced from the insulation tube 6 to avoid heat loss caused by direct contact, so that the heat is concentrated in the uniform temperature zone, thereby improving the heating efficiency and temperature control accuracy. In order to provide additional insulation protection for the temperature control zone, reduce the conduction of heat to the outside, and improve the accuracy and efficiency of temperature control in the temperature control zone.

[0245] like Figure 1 and Figure 2 As shown, in some embodiments, the second heating element 5 includes:

[0246] The second heating wire surrounds the inner wall of the insulation tube 6 to form a plurality of second heating coils. Adjacent second heating coils are spaced apart from each other, and the spacing between adjacent second heating coils gradually increases in a direction away from the temperature-averaging tube 2 .

[0247] Specifically, the length of the insulation tube 6 can be the sum of the lengths of the temperature-equalizing tube 2 and the two temperature control zones. At this time, both ends of the insulation tube 6 can be connected to the furnace body through flanges. The temperature-equalizing zone is located in the middle of the insulation tube 6 in the vertical direction, and the insulation tube 6 realizes the thermal insulation protection of the two temperature control zones. At the same time, this arrangement helps to maintain a stable high-temperature environment in the temperature-equalizing zone, and at the same time, gradually cools down the temperature control zone, reducing the impact of temperature gradient changes on the finished glass product, further avoiding the breakage of the finished glass product A to be tested due to a sudden drop in temperature, and ensuring its structural integrity.

[0248] The second heating wire and the first heating wire can be two independent heating wires to achieve more precise temperature control; or, the second heating wire and the first heating wire can be a continuous heating wire to reduce the complexity and cost of the system. A slot that matches the shape of the second heating wire can be configured on the inner wall of the insulation tube 6, and the second heating wire can be connected to the inner wall of the insulation tube 6 by snapping; or, the second heating wire can be embedded in the inner wall of the insulation tube 6.

[0249] When the second heating wire and the first heating wire are two independent heating wires, the way the second heating wire is connected to the power supply can refer to the first heating wire; the selection of the second heating wire can refer to the first heating wire.

[0250] like Figure 1 As shown, in some embodiments, the furnace body 1 includes:

[0251] The furnace cover 11 has a mounting portion 111, and a portion of the upper end of the glass product A to be tested can be located in the temperature control area, and another portion of the upper end of the glass product A to be tested can extend out of the heating chamber and be detachably connected to the mounting portion 111;

[0252] The furnace wall 12 has the heating chamber, and the furnace cover 11 is movably and hermetically connected to the furnace wall 12 .

[0253] Specifically, the furnace wall 12 can be recessed in the vertical direction to form a heating chamber, and the furnace cover 11 can cooperate with the furnace wall 12 to form a sealed space in the heating chamber to prevent the upper temperature of the glass to be tested from dropping suddenly. A radiation heating zone is formed between the temperature control zone and the furnace cover 11. The furnace cover 11 can be equipped with a hook, and the upper part of the finished glass product A to be tested can be equipped with a through hole along the thickness direction. The finished glass product A to be tested is connected to the furnace cover 11 through the through hole and the hook, and the hook forms a mounting portion 111; or,

[0254] The mounting portion 111 may include an adjusting rod and two opposing clamping plates, the two clamping plates may be slidably connected to the furnace cover 11, the adjusting rod has a first thread segment and a second thread segment with opposite threads, the first thread segment is threadedly connected to one clamping plate, and the second thread segment is threadedly connected to the other clamping plate, and by rotating the adjusting rod, the two clamping plates can be brought closer to or farther from each other, thereby clamping or releasing the finished glass product A to be tested.

[0255] A sealing ring may be sleeved on the outside of the furnace cover 11, and the furnace cover 11 may be rotatably connected to the furnace wall 12; or, the furnace cover 11 may be threadedly connected to the furnace wall 12. When the present application includes a plurality of hanging members 7, the first ends of the plurality of hanging members 7 may all be connected to the furnace cover 11, and the mounting portion 111 is located on the inner side of the plurality of hanging members 7.

[0256] like Figure 1 As shown, in some embodiments, the furnace body 1 further includes:

[0257] A base 13 is sealed and connected to the furnace wall 12;

[0258] The base 13 has a containing space, a part of the lower end of the glass product A to be tested can be located in the temperature control area, and another part of the lower end of the glass product A to be tested can pass through the heating chamber and extend into the containing space.

[0259] Specifically, the furnace wall 12 can penetrate in the vertical direction to form a heating cavity. The dimension of the heat insulation tube 6 in the vertical direction can be the same as the dimension of the heating cavity in the vertical direction. The base 13 and the furnace wall 12 can be sealed by the flange and the sealing ring; or, in order to ensure the sealing effect, the base 13 and the furnace wall 12 can be integrally formed, and the accommodating space forms a radiation heating zone to prevent the temperature of the lower end of the glass product A to be tested from dropping suddenly.

[0260] The base 13 can be configured with an observation area, and the load 10 has a certain size, so that the structural integrity of the glass product A to be tested and the movement of the load 10 can be visually observed by naked eyes during the entire measurement process. High temperature resistant glass can be installed on the base 13 to form an observation area. At this time, the moving speed of the load 10 on the glass product A to be tested can be measured by a camera, and the camera head of the camera is facing the observation area.

[0261] like Figure 1 As shown, in some embodiments, it also includes:

[0262] A connecting member 8, having a connecting end, wherein the connecting end is used for detachably connecting with the lower end of the finished glass product A to be tested;

[0263] A speed sensor 9 connected to the connecting member 8;

[0264] The load 10 is connected to the connecting member 8 .

[0265] Specifically, the connecting member 8 may be in the shape of a strip, and both ends thereof may be provided with connecting ends to achieve connection with the line segment of the glass product A to be tested and the load 10, thereby ensuring the convenience and flexibility of loading and unloading the load 10. The specific structure of the connecting end may refer to the fixing part. The load 10 may be prepared by casting or machining.

[0266] The speed sensor 9 can be arranged in the middle of the length direction of the connecting member 8. The speed sensor 9 can be connected to the connecting member 8 by bonding or bolting. The speed sensor 9 can be a photoelectric encoder or a Hall effect sensor.

[0267] By directly integrating the speed sensor 9 and the load 10 in the measuring device, they can be managed and monitored through a unified control system, reducing the complexity of communication between different devices and improving the coordination and stability of the system.

[0268] like Figure 1 As shown, in some embodiments, it also includes:

[0269] The controller 20 is signal-connected to the first heating element 3 , the second heating element 5 and the temperature sensor 4 , respectively.

[0270] Specifically, the controller 20 can be connected to the speed sensor 9 by signal. The controller 20 is used to monitor and adjust the operating state of the entire system to ensure that parameters such as temperature and speed during the experiment remain within the set range. The controller 20 can be a programmable logic controller or an embedded controller, etc.

[0271] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for measuring the strain point and annealing point of glass, characterized in that: include: Connect the load to the lower end of the glass product to be tested which is suspended in the vertical direction; The finished glass product to be tested is placed in a temperature field, so that both ends of the finished glass product to be tested in the vertical direction are located in the temperature control zone, and the middle part of the finished glass product to be tested in the vertical direction is located in the uniform temperature zone adjacent to the temperature control zone, and the uniform temperature zone has a preset size L in the vertical direction; gradually increasing the temperature T of the temperature-averaging zone and the temperature of the temperature-controlling zone, and maintaining the temperature of the temperature-averaging zone higher than a first preset temperature value of the temperature-controlling zone during the heating process, so that both ends of the tested glass product always have a stable structure; Obtain the elongation velocity V of the glass product to be tested 测 , obtain the T; Based on the mass M of the load, the L, the V 测 and T, to obtain the strain point T of the glass product to be tested 应 and annealing point T 退 .

2. The method for measuring the strain point and annealing point of glass according to claim 1, characterized in that: The method of placing the glass product to be tested in a temperature field so that both ends of the glass product to be tested in a vertical direction are located in a temperature control zone comprises: Placing the glass product to be tested and the temperature field in the same sealed space, so that both ends of the glass product to be tested in the vertical direction are partially located in the temperature control zone, and the other parts are extended into the radiation heating zone; Wherein, the temperature of the radiation heating zone is formed by the heat radiation of the uniform temperature zone and the temperature control zone.

3. The method for measuring the strain point and annealing point of glass according to claim 1, characterized in that: The method of maintaining the temperature of the temperature-averaging zone higher than the first preset temperature value of the temperature control zone during the heating process includes: A first side of the temperature control zone along the vertical direction is farther away from the uniform temperature zone than a second side thereof; During the heating process, the temperature of the temperature-averaging zone is maintained higher than the first preset value of the temperature on the second side of the temperature control zone, and the temperature of the temperature control zone gradually increases from the first side to the second side.

4. The method for measuring the strain point and annealing point of glass according to claim 1, characterized in that: Based on the V 测 and T, to obtain the strain point T of the glass product to be tested 应 and annealing point T 退 The methods include: Construct the viscosity and mechanical elongation speed V of the glass product to be tested 机 The relationship E: Wherein, η is the viscosity of the glass product to be tested, Pa·s; M is the mass of the load, kg; g is the acceleration due to gravity, m / s 2 ; L is the preset size, m; V 机 is the mechanical elongation speed of the glass product to be tested, m / s; S is the cross-sectional area of ​​the finished glass product to be tested, m 2 ; Based on the relationship E, the elongation velocity V corresponding to the strain point is calculated. 应 , when V 测 =V 应 When the corresponding temperature is T 应 ; Based on the relationship E, the elongation speed V corresponding to the annealing point is calculated. 退 , when V 测 =V 退 When the corresponding temperature is T 退 .

5. The method for measuring the strain point and annealing point of glass according to claim 4, characterized in that: The calculation formula of the mass M of the load is: M=kS Where k is the load factor per unit area, ranging from 2.5-4kg / m 2 ; The length direction of the glass product to be tested is the same as the vertical direction, and the calculation formula of S is: S=DW Wherein, D is the thickness of the finished glass product to be tested, m; W is the width of the finished glass product to be tested, m.

6. The method for measuring the strain point and annealing point of glass according to claim 4, characterized in that: Correction of the V 退 , the T 退 The corresponding corrected elongation velocity V 退 The calculation formula of ′ is: V ′ 退 =V 退 +V 均 +V 控 Among them, V 退 ' is the corrected T 退 The corresponding elongation speed, m / s; V 均 is the expansion velocity corresponding to the current temperature of the uniform temperature zone, m / s; V 控 is the expansion velocity corresponding to the current temperature of the temperature control zone, m / s; Correction of the V 应 , the T 应 The corresponding corrected elongation velocity V 应 The calculation formula of ′ is: V 应 ′=V 应 +V 均 +V 控 Among them, V 应 ' is the corrected T 应 The corresponding elongation speed, m / s.

7. The method for measuring the strain point and annealing point of glass according to claim 4, characterized in that: The strain point and annealing point of the standard sample are obtained by adopting the same measurement method as the measurement method of the finished glass to be tested; The following formula is used to correct the T 应 : Among them, T 标测1 is the strain point temperature of the standard sample measured, °C; T 标实1 is the known actual strain point temperature of the standard sample, °C; T 应 ' is the corrected strain point temperature of the tested glass product, °C; The following formula is used to correct the annealing point T of the glass product to be tested: 退 : Among them, T 标测2 is the measured annealing point temperature of the standard sample, °C; T 标实2 is the known actual annealing point temperature of the standard sample, °C; T 退 ' is the corrected annealing point temperature of the tested glass product, °C.

8. The method for measuring the strain point and annealing point of glass according to claim 1, characterized in that: The thickness of the glass to be tested is 0.2-1.1 mm; and / or, The length of the glass to be tested is 120-250 mm; and / or, The width of the glass to be tested is 8-30 mm; and / or, The first preset value is 50-110° C.; and / or, The L is 0.08-0.12 m; and / or, The upper limit of the temperature in the uniform temperature zone is 1000-1500°C.

9. A device for measuring the strain point and annealing point of glass, characterized in that: include: A furnace body having a heating chamber; A temperature-averaging tube is located in the heating chamber and connected to the furnace body, and the length direction of the temperature-averaging tube is consistent with the vertical direction; A first heating element, connected to the outer wall of the temperature-averaging tube, for heating the temperature-averaging tube to form a uniform temperature zone inside the temperature-averaging tube; A temperature sensor connected to the inner wall of the temperature-averaging tube and used to measure the temperature of the temperature-averaging tube; Two second heating elements are located in the heating chamber and connected to the furnace body, and the two second heating elements are respectively located at the two ends of the temperature-averaging tube; the two second heating elements are heated to form two temperature control zones adjacent to the temperature-averaging zone; the temperature of the temperature-averaging zone can be maintained higher than the first preset value of the temperature of each temperature control zone during the heating process, so that the two ends of the finished glass product to be tested always have a stable structure.

10. The device for measuring the strain point and annealing point of glass according to claim 9, characterized in that: The first heating element comprises: The first heating wire is wound around the outer wall of the temperature-averaging tube to form a plurality of first heating coils, and adjacent first heating coils are in contact with each other; the plurality of first heating coils extend continuously from one end of the temperature-averaging tube to the other end.

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