Measuring device for strain point and annealing point of glass

Abstract

The utility model provides a glass strain point and annealing point measuring device which comprises a furnace body provided with a heating cavity; the temperature equalizing pipe is located in the heating cavity and connected with the furnace body, and the length direction of the temperature equalizing pipe is consistent with the vertical direction; the first heating piece is connected with the outer wall of the uniform-temperature pipe and used for heating the uniform-temperature pipe so that a uniform-temperature area can be formed in the uniform-temperature pipe; the temperature sensor is connected with the inner wall of the temperature equalizing pipe and is used for measuring the temperature of the temperature equalizing pipe; the two second heating pieces are located in the heating cavity and connected with the furnace body, and the two second heating pieces are located at the two ends of the uniform temperature pipe correspondingly; the two second heating pieces are heated to form two temperature regulation and control areas adjacent to the uniform temperature area; the temperature of the uniform temperature area can be kept higher than a first preset value of the temperature of each temperature regulation and control area in the heating process, so that the two ends of the to-be-tested glass finished product have stable structures all the time. According to the measuring device, the technical barrier that in the prior art, a glass finished product cannot be directly measured is broken through, and direct measurement of the finished product glass is achieved.

Description

Technical Field

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

[0002] Annealing is a crucial step in glass production, primarily aimed at eliminating internal stresses generated during rapid forming and ensuring product quality. During annealing, the temperature must be strictly controlled: above the glass's strain point but below its annealing point. This ensures that while eliminating internal stress, the glass does not deform due to excessive heat, maintaining structural integrity. Therefore, precise measurement of the strain point and annealing point is essential for optimizing and accurately controlling the annealing process.

[0003] In existing technologies, there are two methods for measuring strain point and annealing point. The first is the fiber-loaded elongation method: This method involves secondary heat processing of the glass sample into fine filaments with a diameter of 0.65 mm ± 0.1 mm and a wire diameter uniformity of no more than 0.02 mm. A constant load is applied to one end, and the filaments are then heated. The strain point and annealing point are determined by analyzing the change in elongation at different temperatures. The second is the bending beam method: This method involves secondary heat processing of the glass sample into strips at least 3 mm thick. The sample is placed in a heating furnace, and a fixed load is applied to both ends, causing the sample to be in a bent state. As the temperature gradually increases, the strain point and annealing point are determined by monitoring the displacement change at the center of the sample.

[0004] However, the inventors discovered during the creation of this invention that existing methods for measuring strain points and annealing points all require secondary thermal processing of the glass to form a sample. When measuring ultra-thin glass (thickness 0.2mm-1.1mm), this secondary thermal processing is not only complex and inefficient, but also leads to the volatilization and loss of key components (such as lithium ions, sodium ions, etc.) and measurement errors caused by crystallization, affecting the accuracy of the measurement results. Utility Model Content

[0005] The purpose of this application is to provide a device for measuring the strain point and annealing point of glass, so as to realize the direct measurement of the strain point and annealing point of finished glass products.

[0006] To solve the above-mentioned technical problems, this application provides a measuring device for glass strain point and annealing point, comprising:

[0007] The furnace body has a heating chamber;

[0008] A temperature equalization tube is located inside the heating chamber and connected to the furnace body; the length direction of the temperature equalization tube is consistent with the vertical direction.

[0009] The first heating element is connected to the outer wall of the heat exchange tube and is used to heat the heat exchange tube to form a uniform temperature zone inside the heat exchange tube.

[0010] A temperature sensor, connected to the inner wall of the heat exchanger tube, is used to measure the temperature of the heat exchanger tube;

[0011] Two second heating elements are located inside the heating chamber and connected to the furnace body. The two second heating elements are respectively located at both ends of the heat equalization tube. The heating of the two second heating elements can form two temperature control zones adjacent to the heat equalization zone. The temperature of the heat equalization zone can be maintained higher than the first preset temperature value of each temperature control zone during the heating process, so that the two ends of the glass product under test always have a stable structure.

[0012] In some embodiments, the first heating element includes:

[0013] A first heating wire is wound around the outer wall of the heat exchanger to form multiple first heating coils, with adjacent first heating coils in contact with each other; the multiple first heating coils extend continuously from one end of the heat exchanger to the other end.

[0014] In some embodiments, it also includes:

[0015] A heat insulation tube is located inside the heating chamber and connected to the furnace body. The first heating element is located between the heat insulation tube and the heat equalization tube. The heat insulation tube and the heat equalization tube are coaxial.

[0016] In some embodiments, it also includes:

[0017] Multiple suspension components, the first end of each of the multiple suspension components being connected to the furnace body;

[0018] The end face of the first end of the heat exchanger is provided with multiple lifting parts, which are arranged at equal intervals along a circumferential trajectory. The second end of each suspension component is connected to one of the lifting parts.

[0019] In some embodiments, it also includes:

[0020] Two heat insulation rings are provided, and fixed parts are provided at both ends of the heat-equalizing tube. The two heat insulation rings are respectively connected to the end faces of both ends of the heat-equalizing tube through the fixed parts. The heat insulation rings are connected to the inner wall of the heat insulation tube.

[0021] The first heating element is spaced apart from the heat insulation tube, and the heat insulation ring has an expansion joint.

[0022] In some embodiments, the second heating element includes:

[0023] The second heating wire is wrapped around the inner wall of the heat insulation tube to form multiple second heating coils. Adjacent second heating coils are spaced apart from each other, and the distance between adjacent second heating coils gradually increases in the direction away from the heat equalization tube.

[0024] In some embodiments, the furnace body includes:

[0025] The furnace cover has a mounting part, and the upper part of a portion of the glass product to be tested can be located in the temperature control zone, while the upper part of the other portion of the glass product to be tested can extend out of the heating chamber and be detachably connected to the mounting part.

[0026] The furnace wall has the heating chamber, and the furnace cover is movably and sealingly connected to the furnace wall.

[0027] In some embodiments, the furnace body further includes:

[0028] The base is sealed to the furnace wall;

[0029] The base has a receiving space, and the lower part of the glass product to be tested can be located in the temperature control zone, while the lower part of the other part of the glass product to be tested can extend into the receiving space through the heating cavity.

[0030] In some embodiments, it also includes:

[0031] A connector having a connecting end for detachably connecting to the lower end of the finished glass product to be tested;

[0032] A speed sensor is connected to the connector.

[0033] The load is connected to the connector.

[0034] In some embodiments, it also includes:

[0035] The controller is connected to the first heating element, the second heating element, and the temperature sensor, respectively.

[0036] Compared to existing technologies, the glass strain point and annealing point measuring device provided in this application provides a uniform temperature zone for the glass product under test by connecting the first heating element to the outer wall of the uniform temperature tube. The heating of this uniform temperature zone changes the elongation rate of the glass product under test. By connecting the temperature sensor to the inner wall of the uniform temperature tube, the accuracy of temperature measurement in the uniform temperature zone is ensured. By setting two second heating elements at both ends of the uniform temperature tube, a region adjacent to the uniform temperature zone but with a lower temperature is formed, ensuring that the glass product under test in the temperature control zone always has a stable structure, ensuring the accuracy of the final measurement result. At the same time, a smooth temperature transition between the uniform temperature zone and the temperature control zone is achieved, avoiding the glass product under test from breaking due to sudden temperature changes, ensuring its structural integrity, and ensuring the continuity of the measurement process.

[0037] The glass strain point and annealing point measuring device of this application breaks through the technical barrier of the prior art that cannot directly measure finished glass products, and realizes the direct measurement of finished glass products. Since there is no need to perform secondary heat treatment on the finished glass products during the measurement process, it not only improves the measurement efficiency, but also ensures the accuracy of the measurement results. Attached Figure Description

[0038] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application are illustrated by way of example and not limitation, with the same or corresponding reference numerals denoteing the same or corresponding parts, wherein:

[0039] Figure 1 A schematic diagram of the structure of the measuring device for glass strain point and annealing point is shown.

[0040] Figure 2 A schematic diagram of the structure of the first and second heating elements of the device for measuring the strain point and annealing point of glass is shown.

[0041] Figure 3 A schematic diagram of the furnace cover, suspension components, and isotherm tube of the device for measuring glass strain point and annealing point is shown.

[0042] Explanation of icon numbers:

[0043] 1. Furnace body; 11. Furnace cover; 111. Mounting part; 12. Furnace wall; 13. Base; 2. Irradiation pipe; 21. Lifting part; 3. First heating element; 4. Temperature sensor; 5. Second heating element; 6. Insulation pipe; 7. Suspension part; 8. Connecting part; 9. Speed ​​sensor; 10. Load; 20. Controller; A. Finished glass product to be tested. Detailed Implementation

[0044] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0045] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains.

[0046] The strain point refers to the initial temperature at which glass transitions from a rigid to a viscoelastic state. When glass reaches the strain point, it exhibits plastic deformation capabilities and elongates under external force. Below the strain point, glass behaves as a rigid solid. The annealing point is the optimal temperature for complete release of internal stress in glass. At this temperature, residual stress within the glass can be completely eliminated through slow cooling, restoring the glass to a stress-free state. In the glass annealing process, by precisely controlling the temperature within the range of the strain point and annealing point, internal stress in the glass can be eliminated while ensuring that the glass maintains structural integrity and performance stability during forming and cooling.

[0047] To measure strain point and annealing point, the applicant discovered that either the fiber-loaded elongation method or the bending beam method could be used. Both methods require secondary heat processing of the glass sample to the desired size before further heat treatment. However, for ultra-thin glass with a thickness ranging from 0.2 to 1.1 mm, the sample preparation process is complex and inefficient, regardless of whether the fiber-loaded elongation method is used to process it into filaments or the bending beam method into strips. Furthermore, the alteration of the physicochemical properties of the glass sample during the secondary heat processing affects the accuracy of the final test results.

[0048] Based on the above considerations, in order to achieve rapid and accurate measurement of ultrathin glass, the inventors, through in-depth research, designed a measuring device for the strain point and annealing point of glass. This device can directly measure the finished glass product. By uniformly heating the middle part of the finished glass product along the vertical direction through a uniform temperature tube and a first heating tube, a uniform temperature zone is formed, so that this part has a certain elongation rate V under load. 测 The second heating element heats both ends of the glass product under test along the vertical direction to form a temperature control zone. During the heating process, the temperature of the uniform temperature zone is kept higher than the temperature of the temperature control zone by a first preset value. This prevents the glass product under test in the temperature control zone from elongating along the vertical direction at both ends, ensuring that the part in the temperature control zone always has a stable structure, thus ensuring the accuracy of the final measurement result. At the same time, it achieves a smooth temperature transition between the uniform temperature zone and the temperature control zone, preventing the glass product under test from breaking due to sudden temperature changes, ensuring its structural integrity, and ensuring the continuity of the measurement process.

[0049] like Figure 1 and Figure 2 As shown, this application provides a measuring device for glass strain point and annealing point, comprising:

[0050] Furnace body 1 has a heating chamber;

[0051] The temperature equalization tube 2 is located inside the heating chamber and connected to the furnace body 1. The length direction of the temperature equalization tube 2 is consistent with the vertical direction.

[0052] The first heating element 3 is connected to the outer wall of the heat exchanger 2 and is used to heat the heat exchanger 2 to form a uniform temperature zone inside the heat exchanger 2.

[0053] Temperature sensor 4 is connected to the inner wall of the heat exchanger 2 and is used to measure the temperature of the heat exchanger 2;

[0054] Two second heating elements 5 are located inside the heating chamber and connected to the furnace body 1. The two second heating elements 5 are respectively located at both ends of the heat equalization tube 2. The heating of the two second heating elements 5 can form two temperature control zones adjacent to the heat equalization zone. The temperature of the heat equalization zone can be maintained higher than the first preset temperature value of each temperature control zone during the heating process, so that the two ends of the glass product A under test always have a stable structure.

[0055] Specifically, furnace body 1 is the core outer shell of the entire measuring device, which provides the heating environment to form a temperature field. Furnace body 1 can be made of insulating material, such as aluminum silicate fiber or microporous calcium silicate board. Furnace body 1 has an opening communicating with the heating chamber, which is used to retrieve the glass product A to be tested.

[0056] When heated, the heat spreader 2 can form a uniform temperature zone inside. A groove matching the shape of the heat spreader 2 can be provided on the inner wall of the furnace body 1, through which the heat spreader 2 can be embedded into the furnace body 1.

[0057] The temperature distribution tube 2 has a preset dimension L in the vertical direction, which is 0.08-0.12m, to ensure the accuracy of the final measurement results. The temperature distribution tube 2 can be made of a material with good thermal conductivity. The material of the temperature distribution tube 2 can be controlled according to the upper limit of the temperature required for the measurement. For example, when the upper limit temperature of the temperature distribution zone needs to reach 1000℃, a copper-based alloy can be used to reduce production costs while ensuring the upper limit temperature; when the upper limit temperature of the temperature distribution zone needs to reach 1500℃, a platinum-based alloy can be used.

[0058] The first heating element 3 is used to heat the heat spreader 2. The first heating element 3 may include multiple silicon carbide rods, the length direction of which is the same as the length direction of the heat spreader 2. The multiple silicon carbide rods are evenly spaced along a circumferential trajectory on the outer wall of the heat spreader 2. High-temperature resistant clamps or fixtures can be used to connect the multiple silicon carbide rods to the outer wall of the heat spreader 2. The high-temperature resistant clamps or fixtures can be made of stainless steel or ceramic materials to ensure a stable connection in a high-temperature environment. In this case, the grooves of the furnace body 1 need to be compatible with the size of the multiple silicon carbide rods. Alternatively, multiple grooves can be evenly spaced along a circumferential trajectory on the outer wall of the heat spreader 2. The length direction of the grooves is the same as the vertical direction. Each silicon carbide rod is embedded into the heat spreader 2 through a groove and fixed and sealed with high-temperature resistant materials (such as ceramic fibers, mica sheets, etc.) to ensure its stable position and not affect heat transfer, reduce heat loss and improve heat conduction efficiency.

[0059] The furnace body 1 has wiring holes. The measuring device may also include a plug and a multi-core cable. The multi-core cable passes through the wiring holes and is sealed to the furnace body 1 to ensure no heat leakage and that external gases cannot enter the heating chamber. Each silicon carbide rod can be electrically connected to the first end of an alumina ceramic terminal of the multi-core cable; the second ends of multiple alumina ceramic terminals of the multi-core cable are all connected to the plug, which enables connection to an external power source, allowing simultaneous heating of multiple silicon carbide rods, ensuring temperature uniformity in the uniform temperature zone, and guaranteeing the accuracy of the final measurement results.

[0060] Temperature sensor 4 is used to measure the temperature of the temperature homogenization zone. Temperature sensor 4 can be a thermocouple or a fiber optic temperature sensor, with a thermocouple being preferred to reduce production costs. The thermocouple can be connected to the inner wall of the temperature homogenization tube 2 by welding or embedding to ensure the accuracy of temperature measurement in the temperature homogenization zone. Temperature sensor 4 may include one or more thermocouples. When there are multiple thermocouples, they can be arranged at equal intervals along the length of the inner wall of the temperature homogenization tube 2 to comprehensively monitor the temperature distribution within the temperature homogenization zone. The measuring device may include a signal acquisition system, and the thermocouples can be connected to the signal acquisition system through alumina ceramic terminals.

[0061] The second heating element 5 is used to provide heat to the temperature control zones at both ends of the heat exchanger 2, forming a region adjacent to the heat exchanger zone but with a lower temperature. The connection method of the second heating element 5 can refer to that of the first heating element 3, and the selection method of the second heating element 5 can refer to that of the first heating element 3.

[0062] During the measurement process, a known weight can be used as the load 10. Through holes along the thickness direction can be provided at both the upper and lower ends of the glass product A to be tested. The load 10 can be hung on the lower end of the glass product A through these through holes. A metal or ceramic rod can be passed through the through hole at the upper end of the glass product A and mounted on the outer wall of the furnace body 1 to suspend the glass product A. During suspension, the distance between the glass product A and the inner wall of the heat exchanger 2 must be maintained at all points to ensure uniform heating. An external speed sensor can be used to measure the speed.

[0063] Compared to existing technologies, the glass strain point and annealing point measuring device provided in this application provides a uniform temperature zone for the glass product A to be tested by connecting the first heating element 3 to the outer wall of the uniform temperature tube 2. The heating of this uniform temperature zone changes the elongation rate of the glass product A to be tested. By connecting the temperature sensor 4 to the inner wall of the uniform temperature tube 2, the accuracy of the temperature measurement of the uniform temperature zone is ensured. By setting two second heating elements 5 at both ends of the uniform temperature tube 2, a region adjacent to the uniform temperature zone but with a lower temperature is formed, ensuring that the glass product A to be tested in the temperature control zone always has a stable structure, ensuring the accuracy of the final measurement result. At the same time, a smooth temperature transition between the uniform temperature zone and the temperature control zone is achieved, avoiding the glass product A to be tested from breaking due to sudden temperature changes, ensuring its structural integrity, and ensuring the continuity of the measurement process.

[0064] The glass strain point and annealing point measuring device of this application breaks through the technical barrier of the prior art that cannot directly measure finished glass products, and realizes the direct measurement of finished glass products. Since there is no need to perform secondary heat treatment on the finished glass products during the measurement process, it not only improves the measurement efficiency, but also ensures the accuracy of the measurement results.

[0065] like Figure 1 and Figure 2 As shown, in some embodiments, the first heating element 3 includes:

[0066] A first heating wire is wound around the outer wall of the heat exchanger 2 to form multiple first heating coils, with adjacent first heating coils in contact with each other; the multiple first heating coils extend continuously from one end of the heat exchanger 2 to the other end.

[0067] Specifically, multiple first heating coils are formed by continuously winding first heating wires, extending from one end of the heat spreader 2 to the other. Each heating coil is closely adjacent and in contact with each other to ensure that heat is evenly distributed along the entire heat spreader 2. The grooves in the furnace body 1 need to be compatible with the dimensions of the multiple first heating coils. The first heating wires can be connected to an external power source via mineral-insulated cables to ensure reliable and safe current transmission. The mineral-insulated cables can be sealed to the wiring holes in the furnace body 1 to maintain the stability and safety of the heating environment. The first heating wires can be nickel-chromium alloy heating wires or iron-chromium-aluminum alloy heating wires, etc.

[0068] By employing multiple continuous and adjacent heating coils formed by winding a first heating wire, efficient energy transfer is achieved while ensuring temperature uniformity and stability within the uniform temperature zone, providing strong support for the accurate measurement of glass strain point and annealing point.

[0069] like Figure 1 and Figure 2 As shown, in some embodiments, it also includes:

[0070] The heat insulation pipe 6 is located inside the heating chamber and connected to the furnace body 1. The first heating element 3 is located between the heat insulation pipe 6 and the heat equalization pipe 2. The heat insulation pipe 6 and the heat equalization pipe 2 are coaxial.

[0071] Specifically, the heat insulation pipe 6 is used to provide additional heat insulation protection for the heat equalization pipe 2 in the heating chamber, ensuring that heat is concentrated in the heat equalization zone, reducing heat conduction to the outside, ensuring the uniformity of temperature in the heat equalization zone, thereby improving the accuracy and efficiency of temperature control.

[0072] The heat insulation tube 6 can be embedded in the inner wall of the furnace body 1 to ensure a stable connection under high-temperature conditions. The heat insulation tube 6 can be made of high-efficiency heat insulation materials, such as ceramics or alumina, to ensure long-term stability and reliability. The length of the heat insulation tube 6 can be the same as the length of the heat spreader tube 2, and the entire heat spreader tube 2 is located inside the heat insulation tube 6 to ensure the temperature uniformity of the heat spreader zone inside the heat spreader tube 2.

[0073] like Figure 3 As shown, in some embodiments, it also includes:

[0074] Multiple suspension components 7, the first end of each of the multiple suspension components 7 being connected to the furnace body 1;

[0075] The end face of the first end of the heat exchanger 2 is provided with a plurality of lifting parts 21, and the plurality of lifting parts 21 are arranged at equal intervals along a circumferential trajectory. The second end of each suspension member 7 is connected to one of the lifting parts 21.

[0076] Specifically, the second end of the suspension member 7 is used to cooperate with the hoisting part 21 to hoist the heat exchanger tube 2. The suspension member 7 is strip-shaped. The first end of the suspension member 7 can be located inside the heating cavity 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 cavity 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 snap-fit. The first ends of multiple suspension members 7 can be arranged along a circumferential trajectory.

[0077] The second end of the suspension component 7 can be equipped with a pin, and the lifting part 21 can be a pin hole adapted to the pin. By inserting the pin into the pin hole and fixing it with a pin, a stable connection between the suspension component 7 and the lifting part 21 is ensured. Alternatively, the second end of the suspension component 7 can be equipped with a hook, and the lifting part 21 can be a ring adapted to the hook, to facilitate subsequent maintenance and repair of the heat exchanger 2. The suspension component 7 can be made of stainless steel chain, steel wire rope, or ceramic fiber rope, etc.

[0078] In some embodiments, it also includes:

[0079] Two heat insulation rings (not shown in the figure) are provided at both ends of the heat-equalizing pipe 2. The two heat insulation rings are connected to the end faces of both ends of the heat-equalizing pipe 2 through the fixed parts. The heat insulation rings are connected to the inner wall of the heat-equalizing pipe 6.

[0080] The first heating element 3 is spaced apart from the heat insulation pipe 6, and the heat insulation ring has an expansion joint.

[0081] Specifically, the heat insulation ring is used to connect the heat spreader 2 and the furnace body 1. The heat insulation ring not only provides additional thermal insulation protection but also enhances the stability of the connection to the heat spreader 2. The material selection for the heat insulation ring can refer to that for the heat insulation pipe 6.

[0082] The two end faces of the heat exchanger 2 can be provided with embedding grooves, through which the heat insulation ring can be embedded into the end face of the heat exchanger 2, and the embedding grooves form a fixing part; or, the two end faces of the heat exchanger 2 can be provided with threaded holes, and the heat insulation ring can be threadedly connected to the threaded holes by bolts, and the threaded holes form a fixing part. The heat insulation ring can be connected to the inner wall of the heat insulation pipe 6 by bolts; or, a graphite gasket can be provided on the outside of the heat insulation ring, and the heat insulation ring is interference-fitted with the heat insulation pipe 6 through the graphite gasket.

[0083] The expansion joint is used to compensate for the thermal expansion of the heat exchanger 2 during heating, preventing the insulation ring from applying unnecessary mechanical stress to the heat exchanger 2 due to temperature changes, thereby protecting the heat exchanger 2 and its internal components. The expansion joint can be V-shaped or serrated to ensure that the insulation ring can freely expand and contract to accommodate the thermal expansion of the heat exchanger 2.

[0084] The first heating element 3 is spaced apart from the heat insulation pipe 6 to avoid heat loss caused by direct contact, thus concentrating heat in the uniform temperature zone and improving heating efficiency and temperature control accuracy. This provides additional thermal insulation protection to the temperature control zone, reducing heat conduction to the outside and improving the accuracy and efficiency of temperature control in the temperature control zone.

[0085] like Figure 1 and Figure 2 As shown, in some embodiments, the second heating element 5 includes:

[0086] The second heating wire is wrapped around the inner wall of the heat insulation tube 6 to form multiple second heating coils. Adjacent second heating coils are spaced apart from each other, and the distance between adjacent second heating coils gradually increases in the direction away from the heat equalization tube 2.

[0087] Specifically, the length of the heat insulation pipe 6 can be the sum of the lengths of the temperature equalization pipe 2 and the two temperature control zones. In this case, both ends of the heat insulation pipe 6 can be connected to the furnace body via flanges. The temperature equalization zone is located in the middle of the heat insulation pipe 6 along the vertical direction, and the heat insulation pipe 6 provides thermal insulation protection for the two temperature control zones. Simultaneously, this arrangement helps maintain a stable high-temperature environment within the temperature equalization zone, while gradually cooling through the temperature control zones reduces the impact of temperature gradient changes on the finished glass product, further preventing breakage of the tested glass product A due to a sudden temperature drop and ensuring its structural integrity.

[0088] The second heating wire and the first heating wire can be two independent heating wires to achieve more precise temperature control; alternatively, the second heating wire and the first heating wire can be a single continuous heating wire to reduce system complexity and cost. A slot adapted to the shape of the second heating wire can be configured on the inner wall of the heat insulation tube 6, and the second heating wire can be snapped into the inner wall of the heat insulation tube 6; alternatively, the second heating wire can be embedded in the inner wall of the heat insulation tube 6.

[0089] 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 be the same as that of the first heating wire; the selection of the second heating wire can be the same as that of the first heating wire.

[0090] like Figure 1 As shown, in some embodiments, the furnace body 1 includes:

[0091] The furnace cover 11 has a mounting part 111. The upper part of the glass product A to be tested can be located in the temperature control zone, and the upper part of the other part of the glass product A to be tested can extend out of the heating chamber and be detachably connected to the mounting part 111.

[0092] The furnace wall 12 has the heating chamber, and the furnace cover 11 is movably and sealingly connected to the furnace wall 12.

[0093] Specifically, the furnace wall 12 can be recessed vertically to form a heating chamber, and the furnace cover 11 can cooperate with the furnace wall 12 to form a sealed space within the heating chamber, preventing a sudden drop in temperature at the top of the glass to be tested. A radiant heating zone is formed between the temperature control zone and the furnace cover 11. The furnace cover 11 can be equipped with hooks, and the upper part of the glass product A to be tested can be provided with through holes along the thickness direction. The glass product A to be tested is connected to the furnace cover 11 through the through holes and hooks, at which point the hooks form a mounting part 111; or,

[0094] The mounting part 111 may include an adjusting rod and two opposing clamping plates. The two clamping plates can be slidably connected to the furnace cover 11. The adjusting rod has a first threaded section and a second threaded section with opposite threads. The first threaded section is threadedly connected to one clamping plate, and the second threaded section is threadedly connected to the other clamping plate. By rotating the adjusting rod, the two clamping plates can be moved closer or further apart, thereby clamping or releasing the glass product A to be tested.

[0095] A sealing ring can be fitted onto the outside of the furnace cover 11, and the furnace cover 11 can be rotatably connected to the furnace wall 12; or, the furnace cover 11 can be threadedly connected to the furnace wall 12. When this application includes multiple hanging members 7, the first ends of the multiple hanging members 7 can all be connected to the furnace cover 11, and the mounting part 111 is located inside the multiple hanging members 7.

[0096] like Figure 1 As shown, in some embodiments, the furnace body 1 further includes:

[0097] The base 13 is sealed to the furnace wall 12;

[0098] The base 13 has a receiving space, and the lower end of a portion of the glass product A to be tested can be located in the temperature control zone, while the lower end of another portion of the glass product A to be tested can extend into the receiving space through the heating cavity.

[0099] Specifically, the furnace wall 12 can extend vertically to form a heating chamber. The vertical dimension of the heat insulation pipe 6 can be the same as the vertical dimension of the heating chamber. The base 13 and the furnace wall 12 can be sealed together by a flange and a sealing ring; or, to ensure a good seal, the base 13 and the furnace wall 12 can be integrally formed, in which case the accommodating space forms a radiant heating zone to prevent a sudden drop in temperature at the lower end of the glass product A to be tested.

[0100] The base 13 can be configured with an observation area, and the load 10 has a certain size to allow for visual observation of the structural integrity of the glass product A under test and the movement of the load 10 throughout the measurement process. High-temperature resistant glass can be mounted on the base 13 to form the observation area. At this time, the movement speed of the load 10 on the glass product A under test can be monitored by a camera, with the camera lens facing the observation area.

[0101] like Figure 1 As shown, in some embodiments, it also includes:

[0102] The connector 8 has a connecting end, which is used to detachably connect to the lower end of the glass product A to be tested;

[0103] Speed ​​sensor 9 is connected to connector 8;

[0104] Load 10 is connected to the connector 8.

[0105] Specifically, the connector 8 can be strip-shaped, with connecting ends at both ends to connect with the line segment of the glass product A to be tested and the load 10, ensuring the convenience and flexibility of loading and unloading the load 10. The specific structure of the connecting ends can be referenced from the fixing part. The load 10 can be manufactured by casting or machining.

[0106] The speed sensor 9 can be located at the middle of the connector 8 along its length. The speed sensor 9 can be connected to the connector 8 by adhesive bonding or bolts. The speed sensor 9 can be a photoelectric encoder or a Hall effect sensor, etc.

[0107] By directly integrating the speed sensor 9 and the load 10 into the measuring device, management and monitoring can be achieved through a unified control system, reducing the communication complexity between different devices and improving the system's coordination and stability.

[0108] like Figure 1 As shown, in some embodiments, it also includes:

[0109] The controller 20 is connected to the first heating element 3, the second heating element 5 and the temperature sensor 4 respectively.

[0110] Specifically, controller 20 can be connected to speed sensor 9. Controller 20 is used to monitor and regulate the operating status of the entire system, ensuring that parameters such as temperature and speed remain within set ranges during the experiment. Controller 20 can be a programmable logic controller or an embedded controller, etc.

[0111] The method for measuring the glass strain point and annealing point in this application includes:

[0112] The load is connected to the lower end of the glass product to be tested, which is suspended vertically.

[0113] Specifically, before testing, the surface of the glass product to be tested can be cleaned to ensure it is clean and dust-free, thus guaranteeing the accuracy of the measurement results. The glass product to be tested is rectangular and can be either ultra-thin or ordinary glass. When the glass product is ultra-thin, its thickness is 0.2-1.1 mm; and / or, its length is 120-250 mm; and / or, its width is 8-30 mm.

[0114] The upper end of the glass sample to be tested can be suspended from a stable point, such as using a clamp or a special hook, to ensure a secure suspension. Suspending the glass sample vertically ensures it is in a natural, vertical position, avoiding any tilting or bending, thus guaranteeing the reliability and accuracy of the measurement results. To reduce lateral stress and ensure uniform elongation along the length of the glass sample, it can be suspended along its length. The load can be connected to the lower end of the glass sample via a wire or a special hook.

[0115] The glass product to be tested is placed in a temperature field, such that both ends of the glass product to be tested are located in the temperature control zone along the vertical direction, and the middle part of the glass product to be tested is located in the uniform temperature zone adjacent to the temperature control zone along the vertical direction. The uniform temperature zone has a preset size L along the vertical direction.

[0116] Specifically, the temperature field, vertically from top to bottom, can include a temperature control zone, a uniform temperature zone, and a temperature regulation zone. The suspended sample can be placed into the temperature field device; alternatively, the glass product to be tested can be placed in the temperature field first, and then the glass sample can be suspended. The position is adjusted so that both ends of the glass product to be tested are within the temperature control zone, and the middle part is within 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 glass product to be tested.

[0117] The preset dimensions determine the degree of heating uniformity of the glass product under test within the uniform temperature zone, thus affecting its Vt. 测 And elongation. L can be set within the range of 0.08-0.12m to ensure that the glass product under test is under optimal temperature uniformity and stability conditions during the test, thereby ensuring consistent elongation behavior and accuracy of measurement results, and enhancing the scientific nature and reliability of the measurement.

[0118] In some embodiments, the method of placing the glass product under test in a temperature field such that both ends of the glass product under test are located in the temperature control zone along the vertical direction includes:

[0119] The glass product to be tested and the temperature field are placed in the same sealed space, such that both ends of the glass product to be tested are partially located in the temperature control zone along the vertical direction, and the other part extends into the radiation heating zone.

[0120] The temperature of the radiant heating zone is formed by the combined thermal radiation from the uniform temperature zone and the temperature control zone.

[0121] Specifically, the temperature field, vertically from top to bottom, can include a radiant heating zone, a temperature control zone, a uniform temperature zone, and another radiant heating zone. The radiant heating zone, located at the top and bottom of the temperature field, provides additional heat through thermal radiation, reducing energy consumption. This multi-layered temperature field structure ensures a smooth temperature transition during testing, avoiding stress concentration or breakage risks caused by sudden temperature changes in the tested glass product, thus guaranteeing its structural integrity.

[0122] The temperature T of the uniform temperature zone and the temperature of the temperature control zone are gradually increased. During the heating process, the temperature of the uniform temperature zone is kept higher than the temperature of the temperature control zone by a first preset value, so that the two ends of the glass product under test always have a stable structure.

[0123] Specifically, during the heating process, the temperature of the uniform temperature zone can be increased first. After a preset interval, the temperature of the temperature control zone can be increased. This process is repeated gradually for both zones, ensuring that the temperature of the uniform temperature zone remains higher than the temperature of the temperature control zone by a first preset value throughout the heating process. A proportional-integral-derivative (PID) controller can be used to precisely control the temperature, ensuring that the temperature of the temperature control zone does not exceed the first preset value of the uniform temperature zone.

[0124] The first preset value can be 50-110℃, so that when the uniform temperature zone is at the annealing point T 退 At that time, the temperature in the temperature control zone was always lower than the strain point T. 应 This method maintains a stable structure at both ends of the glass sample being tested, thus ensuring the accuracy of the measurement results. Furthermore, this heating method allows for a smooth temperature transition between the homogenization zone and the temperature control zone, preventing sample breakage due to sudden temperature changes.

[0125] The upper limit of the temperature in the homogenization zone can be 1000-1500℃ to cover a wider range of testing needs for glass materials, ensuring that the glass product under test can accurately reflect its strain point T during the testing process. 应 and annealing point T 退 This improves the comprehensiveness and accuracy of the test, while ensuring that the finished glass product remains intact throughout the testing process.

[0126] The temperature control zone can be a region with uniform temperature, that is, a region that maintains a uniform temperature distribution. Alternatively, in some embodiments, the method of maintaining the temperature of the uniform temperature zone higher than a first preset value of the temperature control zone during the heating process includes:

[0127] The temperature control zone is located further away from the uniform temperature zone on its first side in the vertical direction relative to the second side;

[0128] During the heating process, the temperature of the uniform temperature zone is kept higher than the temperature of the second side of the temperature control zone by the first preset value, and the temperature of the temperature control zone gradually increases from the first side to the second side.

[0129] Specifically, the temperature control zone can be a region with a temperature gradient, where the temperature gradually decreases from the second side near the uniform temperature zone to the first side far away from the uniform temperature zone, further achieving a smooth temperature transition, avoiding the influence of the surrounding temperature on the finished glass product under test, and enhancing the integrity of the finished glass product under test.

[0130] Obtain the elongation rate V of the glass product under test. 测 , obtain the T.

[0131] Specifically, V can be simultaneously acquired in real time when the temperature rises in the uniform temperature zone. 测 To improve measurement reliability, temperature (T) can be acquired simultaneously during the temperature rise in the uniform temperature zone. Once T reaches a preset temperature, such as 300℃, 350℃, or 400℃, temperature (V) can then be acquired in real time. 测 V 测 T can be obtained through a speed sensor or video measurement system, while T can be obtained through a thermocouple or resistance temperature detector.

[0132] Based on the mass M of the load, the L, and the V 测 And T, the strain point T of the glass product to be tested is obtained. 应 and annealing point T 退 .

[0133] Based on the V 测 And T, the strain point T of the glass product to be tested is obtained. 应 and annealing point T 退 The methods include:

[0134] The viscosity and mechanical elongation rate V of the glass product to be tested are constructed. 机 Relation E:

[0135]

[0136] Wherein, η is the viscosity of the glass product to be tested, Pa·s;

[0137] M is the mass of the load, in kg;

[0138] g is the acceleration due to gravity, m / s² 2 ;

[0139] L is the preset size, in meters;

[0140] V 机 The mechanical elongation rate of the glass product under test is given in m / s.

[0141] S is the cross-sectional area of ​​the glass product to be tested, m 2 ;

[0142] The elongation velocity V corresponding to the strain point is calculated based on the aforementioned relationship E. 应 When V 测 =V 应 When, the corresponding temperature is T. 应 ;

[0143] The elongation rate V corresponding to the annealing point is calculated based on the aforementioned relationship E. 退 When V 测 =V 退 When, the corresponding temperature is T. 退 .

[0144] Specifically, the weight of the load is crucial during testing: if the load is too light, it may not generate sufficient 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 validity and safety of the experiment. Before formal measurement, a pre-loading test can be conducted to verify whether the selected load weight is appropriate; alternatively, to ensure the controllability of measurement conditions and the reliability of results, the mechanical elongation rate V of the glass sample under test can be controlled. 机 By combining the dependent variable with the actual application conditions, the measurement accuracy can be improved and standardized measurement can be achieved. The required load mass M can be calculated before measurement.

[0145] The formula for calculating the mass M of the load is:

[0146] M = kS

[0147] Where k is the load factor per unit area, and its value ranges from 2.5 to 4 kg / m². 2 ;

[0148] The length direction of the glass product to be tested is the same as the vertical direction, and the formula for calculating S is:

[0149] S = DW

[0150] Where D is the thickness of the glass product to be tested, in meters (m);

[0151] W represents the width of the glass product to be tested, in meters (m).

[0152] To ensure the accuracy of the load weight and the final measurement result, 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.

[0153] The viscosity value corresponding to the annealing point is 10. 13.5 Substituting the viscosity value corresponding to the annealing point and the aforementioned M into the relation E, we obtain:

[0154]

[0155] Where g can be approximated as 9.81 m / s 2 V can be calculated by substituting the k and L values ​​into the actual measurement conditions. 退 .

[0156] The viscosity value at the strain point is 10. 12 Pa·s. Substituting the viscosity value corresponding to the strain point and the given M into the relation E, we can obtain:

[0157]

[0158] Where g can be approximated as 9.81 m / s 2 V can be calculated by substituting the k and L values ​​into the actual measurement conditions. 应 .

[0159] In the above calculation, V 应 For strain point T 应 The corresponding V 机 V 退 Annealing point T 退 The corresponding V 机 .

[0160] Due to the actual elongation speed V in the measurement 测 Including mechanical elongation rate V 机 Expansion rate V in the uniform temperature zone 均 and the expansion rate V of the temperature control zone 控 ,Right now:

[0161] V 测 =V 机 +V 均 +V 控

[0162] To eliminate the influence of the expansion of the glass product under test during the measurement process on the results, the V value can be corrected. 退 and V 应 .

[0163] The T 退 The corresponding corrected elongation rate V 退 The formula for calculating ′ is:

[0164] V′ 退 =V 退 +V 均 +V 控

[0165] Among them, V 退 ′ is the corrected T 退 The corresponding elongation rate, in m / s;

[0166] V 均 The expansion rate corresponding to the current temperature of the uniform temperature zone, in m / s;

[0167] V 控 The expansion rate corresponding to the current temperature of the temperature control zone, in m / s;

[0168] That is, when V 测 =V 退 At time ′, the corresponding temperature is T. 退 .

[0169] The T 应 The corresponding corrected elongation rate V 应 The formula for calculating ′ is:

[0170] V 应 ′=V 应 +V 均 +V 控

[0171] Among them, V 应 ′ is the corrected T 应 The corresponding elongation rate, in m / s.

[0172] That is, when V 测 =V 应 At time ′, the corresponding temperature is T. 应 .

[0173] Specifically, V 均 It can be calculated using the following formula:

[0174]

[0175] Where, α 均 The coefficient of thermal expansion of the glass product under test corresponding to the current temperature of the uniform temperature zone is 1 / ℃;

[0176] The rate of change of temperature in the uniform temperature zone over time is expressed in °C / s.

[0177] α 均 The value can be obtained by consulting the material handbook or by experimental determination; It can be measured in real time by a temperature sensor, or set according to the heating program.

[0178] When V 控 In a region with uniform temperature, V 控 It can be calculated using the following formula:

[0179]

[0180] Among them, L 控 The dimension of the glass product to be tested within the temperature control zone is in meters (m).

[0181] α 控 The coefficient of thermal expansion of the glass product under test corresponding to the current temperature of the temperature control zone is 1 / ℃;

[0182] The rate of change of temperature in the temperature control zone over time is expressed in °C / s.

[0183] α 控 The value can be obtained by consulting the material handbook or by experimental determination; It can be measured in real time by a temperature sensor, or set according to the heating program.

[0184] When V 控 When the region has a temperature gradient, the temperature control zone can be divided into n segments along the vertical direction. The expansion velocity V of the i-th segment is then... 控，i It can be calculated using the following formula:

[0185]

[0186] Among them, L 控,i The dimension (m) of the finished glass product to be tested in the i-th segment of the temperature control zone;

[0187] α 控,i The coefficient of thermal expansion of the glass product under test corresponding to the current temperature of the i-th segment of the temperature control zone is 1 / ℃;

[0188] Let be the rate of change of temperature over time in the i-th segment of the temperature control zone, expressed in °C / s.

[0189] α 控,i The value can be obtained by consulting the material handbook or by experimental determination; It can be measured in real time by a temperature sensor, or set according to the heating program.

[0190] Total expansion velocity V 控The following formula can be used for calculation:

[0191]

[0192] In some embodiments, in order to improve measurement accuracy and ensure the reliability of experimental results, the same measurement method as the measurement method of the glass product under test can be used to obtain the strain point and annealing point of the standard sample.

[0193] The following formula is used to correct T 应 :

[0194]

[0195] Among them, T 标测1 The strain point temperature of the standard sample measured is given in °C.

[0196] T 标实1 The actual strain point temperature of the known standard sample is given in °C.

[0197] T 应 ′ represents the corrected strain point temperature of the glass product under test, in °C;

[0198] The annealing point T of the glass product under test is corrected using the following formula. 退 :

[0199]

[0200] Among them, T 标测2 The annealing point temperature of the standard sample was measured, in °C.

[0201] T 标实2 The actual annealing temperature of the known standard sample is given in °C.

[0202] T 退 ′ represents the corrected annealing temperature of the glass product under test, in °C.

[0203] Specifically, standard samples can be obtained through market procurement. By incorporating actual data from standard samples for calibration, the strain point T of the glass product under test can be determined more accurately. 应 and annealing point T 退 .

[0204] Compared to existing technologies, the method for measuring glass strain point and annealing point provided in this application provides a constant tensile force to the glass sample under test by applying a load, ensuring that the glass sample has a sufficient elongation rate V during the heating process. 测 To conduct effective measurements; by utilizing a uniform temperature zone to change the viscosity of the middle part of the glass product under test along the vertical direction, this part will have a certain elongation rate V. 测Because the temperature in the temperature control zone is lower than the first preset temperature in the uniform temperature zone, it not only consistently prevents the vertical elongation of the glass product under test in the temperature control zone, ensuring a stable structure in this part and guaranteeing the accuracy of the final measurement results, but also achieves a smooth temperature transition between the uniform temperature zone and the temperature control zone, preventing the glass product under test from breaking due to sudden temperature changes, ensuring its structural integrity, and guaranteeing the continuity of the measurement process; the elongation rate V of the glass product under test is obtained through this process. 测 And T, determine the strain point T 应 and annealing point T 退 .

[0205] The method for measuring the strain point and annealing point of glass in this application breaks through the technical barrier that prevents direct measurement of finished glass products in the prior art, and realizes the measurement of finished glass products. Since there is no need to perform secondary heat treatment on the finished glass products during the measurement process, it not only improves the measurement efficiency, but also ensures the accuracy of the measurement results.

[0206] Example 1

[0207] The standard sample with a thickness of 0.5 mm, a length of 150 mm, and a width of 20 mm was purchased as the glass product to be tested. The known strain point of the standard sample is 520℃, and the known annealing point of the standard sample is 565℃.

[0208] The glass product to be tested is suspended vertically, with the length direction of the glass product to be tested aligned with the vertical direction.

[0209] The value of k is selected as 2.5 kg / m. 2 Load it and suspend it from the bottom of the finished glass product to be tested;

[0210] The glass product to be tested is placed in a temperature field, with both ends of the glass product to be tested located in the temperature control zone along the vertical direction, and the middle part of the glass product to be tested located in the uniform temperature zone adjacent to the temperature control zone along the vertical direction. The upper limit of the temperature of the uniform temperature zone is 1000℃, and the uniform temperature zone is 0.08m along the vertical direction.

[0211] Calculate V using relation E 应 and V 退 ;

[0212] Gradually increase the temperature T of the uniform temperature zone and the temperature of the temperature control zone, and keep the temperature of the uniform temperature zone 50°C higher than the temperature of the temperature control zone during the heating process;

[0213] Real-time acquisition of the elongation rate V of the glass product under test 测 Obtain the T;

[0214] Obtain the strain point T of the finished glass product to be tested.应 and annealing point T 退 ;

[0215] Record the time t required for the entire measurement process.

[0216] Example 2

[0217] The difference between Example 2 and Example 1 is that the value of k is selected as 3.0 kg / m³. 2 load.

[0218] Example 3

[0219] The difference between Example 3 and Example 1 is that the value of k is selected as 4 kg / m³. 2 load.

[0220] Example 4

[0221] The difference between Example 4 and Example 1 is that the temperature uniformity zone is 0.1m in the vertical direction.

[0222] Example 5

[0223] The difference between Example 5 and Example 1 is that the temperature uniformity zone is 0.12m in the vertical direction.

[0224] Example 6

[0225] The difference between Example 6 and Example 1 is that the temperature of the uniform temperature zone is kept 70°C higher than the temperature of the temperature control zone during the heating process.

[0226] Example 7

[0227] The difference between Example 7 and Example 1 is that the temperature of the uniform temperature zone is kept 110°C higher than the temperature of the temperature control zone during the heating process.

[0228] Example 8

[0229] The difference between Example 8 and Example 1 is that: V 应 Revised to V 应 ′;V 退 Revised to V 退 ′.

[0230] Comparative Example 1

[0231] The difference between Comparative Example 1 and Example 1 is that the traditional fiber load elongation method was used for measurement.

[0232] Comparative Example 2

[0233] The difference between Comparative Example 2 and Example 1 is that the traditional bending beam method was used for measurement.

[0234] Table 1. Measurement data of Examples 1-7 and Comparative Examples 1-2

[0235] 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

[0236] Through Examples 1-7 and Comparative Examples 1-2, it can be concluded that the method for measuring the annealing point and strain point of the glass in this application, and the measured T... 应 The absolute error is ±5℃, and the measured T 退 The absolute error is ±12℃, which is more accurate than that of Comparative Examples 1-2. Furthermore, the entire measurement process of the method in this application is expected to take 2.2-3.3 hours, which is much shorter than the measurement time of Comparative Examples 1-2, greatly improving the measurement efficiency.

[0237] Examples 1-7 show that if the load value k is too large or too small, it will affect the accuracy of the final measurement. Therefore, the load value k needs to be controlled within a reasonable range. If the preset size L is too large or too small, it will affect the accuracy of the final measurement. Therefore, L needs to be controlled within a reasonable range. If the first preset value is too large or too small, it will affect the accuracy of the final measurement. Therefore, L needs to be controlled within a reasonable range.

[0238] From Examples 1-8, it can be concluded that V 应 Revised to V 应 ′, V 退 Revised to V 退 This can improve the accuracy of the measurement method in this application.

[0239] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

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

2. The measuring device for glass strain point and annealing point according to claim 1, characterized in that, The first heating element includes: A first heating wire is wound around the outer wall of the heat exchanger to form multiple first heating coils, with adjacent first heating coils in contact with each other; the multiple first heating coils extend continuously from one end of the heat exchanger to the other end.

3. The measuring device for glass strain point and annealing point according to claim 1, characterized in that, Also includes: A heat insulation tube is located inside the heating chamber and connected to the furnace body. The first heating element is located between the heat insulation tube and the heat equalization tube. The heat insulation tube and the heat equalization tube are coaxial.

4. The measuring device for glass strain point and annealing point according to claim 3, characterized in that, Also includes: Multiple suspension components, the first end of each of the multiple suspension components being connected to the furnace body; The end face of the first end of the heat exchanger is provided with multiple lifting parts, which are arranged at equal intervals along a circumferential trajectory. The second end of each suspension component is connected to one of the lifting parts.

5. The measuring device for glass strain point and annealing point according to claim 3, characterized in that, Also includes: Two heat insulation rings are provided, and fixed parts are provided at both ends of the heat-equalizing tube. The two heat insulation rings are respectively connected to the end faces of both ends of the heat-equalizing tube through the fixed parts. The heat insulation rings are connected to the inner wall of the heat insulation tube. The first heating element is spaced apart from the heat insulation tube, and the heat insulation ring has an expansion joint.

6. The measuring device for glass strain point and annealing point according to claim 3, characterized in that, The second heating element includes: The second heating wire is wrapped around the inner wall of the heat insulation tube to form multiple second heating coils. Adjacent second heating coils are spaced apart from each other, and the distance between adjacent second heating coils gradually increases in the direction away from the heat equalization tube.

7. The measuring device for glass strain point and annealing point according to claim 1, characterized in that, The furnace body includes: The furnace cover has a mounting part, and the upper part of a portion of the glass product to be tested can be located in the temperature control zone, while the upper part of the other portion of the glass product to be tested can extend out of the heating chamber and be detachably connected to the mounting part. The furnace wall has the heating chamber, and the furnace cover is movably and sealingly connected to the furnace wall.

8. The measuring device for glass strain point and annealing point according to claim 7, characterized in that, The furnace body also includes: The base is sealed to the furnace wall; The base has a receiving space, and the lower part of the glass product to be tested can be located in the temperature control zone, while the lower part of the other part of the glass product to be tested can extend into the receiving space through the heating cavity.

9. The measuring device for glass strain point and annealing point according to claim 1, characterized in that, Also includes: A connector having a connecting end for detachably connecting to the lower end of the finished glass product to be tested; A speed sensor is connected to the connector. The load is connected to the connector.

10. The measuring device for glass strain point and annealing point according to claim 1, characterized in that, Also includes: The controller is connected to the first heating element, the second heating element, and the temperature sensor, respectively.

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