Liquid crystal glass melting furnace liquid level detection device
By using a closed-structure liquid level detection device, thermocouples and a heating controller are used to detect the liquid level height in real time, the problems of liquid level measurement error and contamination in liquid crystal glass melting furnaces are solved, and high-precision liquid level monitoring is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- RAINBOW (HEFEI) LIQUID CRYSTAL GLASS CO LTD
- Filing Date
- 2025-04-29
- Publication Date
- 2026-06-02
AI Technical Summary
Existing liquid level detection devices in liquid crystal glass melting furnaces are easily affected by the external environment, resulting in large measurement errors and condensation of volatiles at the liquid level port, causing glass melt contamination, which affects measurement accuracy and product quality.
The system employs a combination of thermocouples, a data processor, a level tube, a sealing plate, a fixed tube, and a buffer shell to form a closed, insulated environment. The liquid level is detected in real time by the temperature difference between the upper and lower parts of the liquid level line in the level tube, and the temperature is kept stable by a heating controller to reduce external interference.
It achieves accurate measurement of liquid level, reduces measurement errors and glass melt contamination, and improves measurement accuracy and the device's resistance to environmental interference.
Smart Images
Figure CN224313409U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of glass substrate processing and manufacturing technology, specifically to a liquid level detection device for liquid crystal glass melting furnace. Background Technology
[0002] In the production of LCD substrate glass, liquid level, furnace pressure, and temperature are the three main factors in the melting furnace. The liquid level detection system is a crucial component of the melting process, typically installed on the upper surface of the channel, which connects the furnace and the liquid level pipe. In actual production, powder enters the furnace via a feeding system. The balance between the powder's input rate and output maintains a stable liquid level. Since the liquid level changes after the powder is added to the furnace, the input rate needs to be adjusted based on the liquid level detection results. This requires continuous liquid level measurement and adjustment of the feeding machine frequency. However, common liquid level measurement devices use mechanical moving probes. Because continuous measurement is required, the liquid level port is open, leading to a lower temperature at the port. This can cause the probe to stick to the molten glass and is also susceptible to environmental changes, resulting in measurement errors. Furthermore, the low temperature causes volatiles at the port to condense, which can contaminate the molten glass and affect the quality of the glass. Utility Model Content
[0003] To overcome the shortcomings of the existing technology, a liquid level detection device for liquid crystal glass melting furnace is provided to solve the problems mentioned in the background technology.
[0004] To achieve the above objectives, a liquid level detection device for a liquid crystal glass melting furnace is provided, comprising: a heat preservation plate, both the heat preservation plate and the liquid level tube being fixedly connected to the upper surface of a channel; a data processor and a heating controller being fixedly connected to the outer side of the heat preservation plate; symmetrical guide grooves being opened on the inner side of the heat preservation plate; a guide plate being slidably connected within the guide grooves; a heat preservation component being fixedly connected to the guide plate; a fixing plate being fixedly connected to the upper surface of the heat preservation plate; a through hole being opened in the middle of the fixing plate; a fixing pipe being fixedly connected to the upper surface of the liquid level tube; a buffer shell being fixedly connected to the upper end of the fixing pipe; an adjusting pipe being connected to the upper surface of the buffer shell corresponding to the position of the through hole; a thermocouple being fixedly connected to the outer side of the liquid level tube; a sleeve being fixedly connected to the surface of the thermocouple; and a main screw being screwed into the inner cavity of the sleeve.
[0005] Preferably, the insulation board has a cylindrical structure, and a fixing plate is fixedly connected to the upper surface of the insulation board by a buckle. The fixing plate has a circular structure, and multiple sets of guide grooves are opened at equal intervals around the inner side of the insulation board. At the same time, the multiple sets of guide grooves are all elongated structures.
[0006] Preferably, the liquid level tube has a cylindrical structure and is located inside the insulation plate. The sealing plate fixedly connected to the upper surface of the liquid level tube has a circular structure, and the opening in the middle of the sealing plate is connected to the inner cavity of the buffer shell through the inner cavity of the fixed tube.
[0007] Preferably, the fixed tube has a cylindrical structure, while the buffer shell has a spherical structure, and the buffer shell and the fixed tube are combined to form a convex structure, while the inner cavity of the buffer shell is connected to the inner cavity of the regulating tube.
[0008] Preferably, there are two sets of thermocouples, and a set of sleeves is fixedly connected to the surface of each set of thermocouples. Both sets of sleeves are cylindrical in shape, and the inner cavity of the sleeves is threaded. At the same time, the two sets of sleeves are screwed to both ends of the same set of main screws.
[0009] Preferably, a set of thermocouples is fixedly connected to the liquid level tube at 10mm intervals along the axial direction of the liquid level tube, and the liquid level tube is made of a thermally conductive material.
[0010] Preferably, the heat insulation component consists of a heat-conducting plate, a heating wire, and a heat insulation plate. Both the heat-conducting plate and the heat insulation plate are cylindrical in shape, and the inner side of the heat insulation plate has an installation groove. The axial section of the heat insulation plate is U-shaped. Meanwhile, the heating wire is spirally arranged in the installation groove, and temperature sensors are symmetrically connected to the surface of the heat-conducting plate.
[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: Through the cooperation of thermocouples, data processors, liquid level tubes, sealing plates, fixing tubes, and buffer shells, the device can obtain liquid level height data in a timely and accurate manner by measuring the temperature difference between the upper and lower ends of the liquid level line in the liquid level tube. Moreover, the upper end of the liquid level tube is sealed, which can reduce the rate of heat loss inside the liquid level tube and reduce the problem of excessively low temperature at the upper end of the liquid level tube. This avoids the measurement inaccuracy caused by glass melt adhesion and also avoids the glass contamination problem caused by the cooling and condensation of volatiles. At the same time, through the cooperation of insulation plates, fixing plates, insulation components, and heating controllers, the temperature inside the insulation plate can be kept in a stable state, reducing the probability of interference from changes in the external environment on the measurement data. Attached Figure Description
[0012] Figure 1 This is a front view schematic diagram of an embodiment of the present utility model.
[0013] Figure 2 This is a top view of an embodiment of the present utility model.
[0014] Figure 3 This is an embodiment of the present utility model. Figure 1 Enlarged diagram of point A.
[0015] Figure 4 This is an embodiment of the present utility model. Figure 1 Enlarged diagram of point B.
[0016] In the diagram: 1. Channel; 2. Insulation plate; 3. Liquid level pipe; 4. Insulation component; 5. Temperature sensor; 6. Sealing plate; 7. Fixing pipe; 8. Thermocouple; 9. Buffer shell; 10. Adjusting pipe; 11. Fixing plate; 12. Data processor; 13. Heating controller; 14. Main lead screw; 15. Sleeve; 16. Guide plate; 17. Heat conducting plate; 18. Heating wire; 19. Insulation plate. Detailed Implementation
[0017] Reference Figures 1 to 4 As shown, this utility model provides a liquid level detection device for a liquid crystal glass melting furnace, including: a heat preservation plate 2, the heat preservation plate 2 and the liquid level pipe 3 are both fixedly connected to the upper surface of the channel 1, and the outer side of the heat preservation plate 2 is fixedly connected to a data processor 12 and a heating controller 13, respectively. The inner side of the heat preservation plate 2 is symmetrically provided with guide grooves, and a guide plate 16 is slidably connected in the guide grooves. The guide plate 16 is fixedly connected to a heat preservation component 4, and a fixing plate 11 is fixedly connected to the upper surface of the heat preservation plate 2. A through hole is provided in the middle of the fixing plate 11, and a fixing pipe 7 is fixedly connected to the upper surface of the liquid level pipe 3. A buffer shell 9 is fixedly connected to the upper end of the fixing pipe 7, and an adjusting pipe 10 is connected to the upper surface of the buffer shell 9 at the position corresponding to the through hole. At the same time, a thermocouple 8 is fixedly connected to the outer side of the liquid level pipe 3, and a sleeve 15 is fixedly connected to the surface of the thermocouple 8. A main screw 14 is screwed into the inner cavity of the sleeve 15.
[0018] In this embodiment, the channel 1 allows the kiln to connect with the level tube 3, ensuring that the liquid level inside the kiln remains consistent with the level tube 3. Therefore, when the liquid level inside the kiln changes, the liquid level inside the level tube 3 also changes accordingly. As the liquid level rises and falls, the relative position of the liquid level line inside the level tube 3 between the two sets of thermocouples 8 changes, causing a corresponding change in the data detected by the two sets of thermocouples 8. The two sets of thermocouples 8 can transmit the detected data to the electrically connected data processor 12, which is equipped with temperature difference calculation and liquid level height... The system corresponds to the temperature, so it can quickly calculate the change in liquid level based on the difference between the two sets of thermocouple 8 data. This facilitates the overall control system (not shown in the figure) to adjust the feeding frequency of the feeding system and regulate the liquid level in the kiln. At the same time, when using this device, the insulation component 4 is first started by the heating controller 13. The insulation component 4 can heat the inside of the insulation plate 2 and perform corresponding insulation treatment through the temperature sensor 5, so that the thermocouple 8 and the liquid level tube 3 can be in a relatively stable temperature environment. This can help improve the accuracy of the thermocouple 8 data measurement and reduce the interference effect of external environmental changes.
[0019] As a preferred embodiment, the insulation board 2 has a cylindrical structure. The upper surface of the insulation board 2 is fixedly connected to the fixing plate 11 by a buckle, and the fixing plate 11 has a circular structure. Multiple sets of guide grooves are opened at equal intervals around the inner side of the insulation board 2, and all sets of guide grooves have a long strip structure.
[0020] In this embodiment, as Figure 1 , Figure 2 and Figure 4 The installation of the insulation plate 2 and the fixing plate 11 allows the liquid level pipe 3 and the thermocouple 8 to be in a relatively closed environment, thereby helping to reduce the degree of interference from the external environment.
[0021] As a preferred embodiment, the liquid level tube 3 has a cylindrical structure and is located inside the insulation plate 2. The sealing plate 6 fixedly connected to the upper surface of the liquid level tube 3 has a circular structure, and the opening in the middle of the sealing plate 6 is connected to the inner cavity of the buffer shell 9 through the inner cavity of the fixed tube 7.
[0022] In this embodiment, as Figure 1 and Figure 2 The structure of the level tube 3, the fixed tube 7, and the buffer shell 9 can effectively reduce the interference caused by the change in air pressure inside the level tube 3 when the liquid level inside the level tube 3 changes, ensuring that the liquid level inside the level tube 3 can be kept at the same height as the liquid level inside the kiln.
[0023] In a preferred embodiment, the fixed tube 7 has a cylindrical structure, while the buffer shell 9 has a spherical structure. The buffer shell 9 and the fixed tube 7 are combined to form a convex structure, and the inner cavity of the buffer shell 9 is connected to the inner cavity of the regulating tube 10.
[0024] In this embodiment, as Figure 1 and Figure 2 The buffer shell 9 effectively increases the total amount of gas inside the liquid level tube 3, thereby helping to improve the tolerance range of gas pressure changes and reducing the probability of inaccurate liquid level due to excessively high or low gas pressure inside the liquid level tube 3. At the same time, the regulating tube 10 facilitates the adjustment of the gas pressure inside the buffer shell 9, ensuring that the gas pressure inside the buffer shell 9 and the liquid level tube 3 can be maintained within a suitable range under different temperature conditions.
[0025] In a preferred embodiment, there are two sets of thermocouples 8. Each set of thermocouples 8 has a set of sleeves 15 fixedly connected to its surface. Both sets of sleeves 15 are cylindrical in shape and have threaded structures inside. The two sets of sleeves 15 are screwed to both ends of the same set of main screws 14.
[0026] In this embodiment, as Figure 1 and Figure 3The main screw 14 and sleeve 15 allow for convenient adjustment of the spacing between the two sets of thermocouples 8. During installation, only one installation position needs to be found on the outer side of the liquid level tube 3 to quickly and easily install the two sets of thermocouples 8 simultaneously, thereby improving the loading and unloading efficiency of the device.
[0027] In a preferred embodiment, a set of thermocouples 8 are fixedly connected to the liquid level inside the liquid level tube 3 at 10mm intervals along the axial direction, and the liquid level tube 3 is made of a thermally conductive material.
[0028] In this embodiment, as Figure 1 The liquid level tube 3 is made of thermally conductive material, and the thermocouple 8 can perform non-contact measurement of the liquid level, which can improve the convenience of measurement and reduce the probability of the liquid level tube 3 having an excessively low temperature.
[0029] In a preferred embodiment, the heat insulation component 4 is composed of a heat-conducting plate 17, a heating wire 18, and a heat insulation plate 19. Both the heat-conducting plate 17 and the heat insulation plate 19 have a cylindrical structure. The inner side of the heat insulation plate 19 has an installation groove, and the axial section of the heat insulation plate 19 has a U-shaped structure. Meanwhile, the heating wire 18 is spirally arranged in the installation groove, and the temperature sensor 5 is symmetrically connected to the surface of the heat-conducting plate 17.
[0030] In this embodiment, as Figure 1 , Figure 2 and Figure 4 The insulation component 4 enables the insulation board 2 to form a relatively stable and enclosed space, thereby reducing the interference of the external environment on the thermocouple 8 and ensuring the accuracy of the thermocouple 8 measurement data.
[0031] The liquid level detection device for liquid crystal glass melting furnace of this utility model, through the cooperation of thermocouple 8, data processor 12, sleeve 15, main screw 14, sealing plate 6, fixing tube 7 and buffer shell 9, enables the device to perform non-contact continuous measurement of liquid level, thereby helping to improve the accuracy of liquid level measurement data. At the same time, both data processor 12 and heating controller 13 can be common brand models on the market.
Claims
1. A liquid level detection device for a liquid crystal glass melting furnace, comprising: The insulation board (2) and the liquid level pipe (3) are fixedly connected to the upper surface of the channel (1), and the data processor (12) and the heating controller (13) are fixedly connected to the outer side of the insulation board (2), respectively. The insulation board (2) has symmetrical guide grooves on its inner side, and guide plates (16) are slidably connected in the guide grooves. The guide plates (16) are fixedly connected to the insulation components (4), and the upper surface of the insulation board (2) is fixedly connected to the fixing plate (11). The middle part of the fixing plate (11) has a through hole, and the upper surface of the liquid level pipe (3) is fixedly connected to the fixing pipe (7). The upper end of the fixing pipe (7) is fixedly connected to the buffer shell (9), and the position of the upper surface of the buffer shell (9) relative to the through hole is connected to the regulating pipe (10). At the same time, the outer side of the liquid level pipe (3) is fixedly connected to the thermocouple (8), and the surface of the thermocouple (8) is fixedly connected to the sleeve (15). The inner cavity of the sleeve (15) is screwed with the main screw (14).
2. The liquid level detection device for a liquid crystal glass melting furnace according to claim 1, characterized in that, The insulation board (2) has a cylindrical structure. The upper surface of the insulation board (2) is fixedly connected to the fixing plate (11) by a buckle. The fixing plate (11) has a circular structure. Multiple sets of guide grooves are opened at equal intervals around the inner side of the insulation board (2). All sets of guide grooves have a long strip structure.
3. The liquid level detection device for a liquid crystal glass melting furnace according to claim 1, characterized in that, The liquid level tube (3) has a cylindrical structure and is located inside the insulation plate (2). The sealing plate (6) fixedly connected to the upper surface of the liquid level tube (3) has a circular structure. At the same time, the opening in the middle of the sealing plate (6) is connected to the inner cavity of the buffer shell (9) through the inner cavity of the fixed tube (7).
4. The liquid level detection device for a liquid crystal glass melting furnace according to claim 1, characterized in that, The fixed tube (7) has a cylindrical structure, while the buffer shell (9) has a spherical structure. The buffer shell (9) and the fixed tube (7) are combined to form a convex structure. At the same time, the inner cavity of the buffer shell (9) is connected to the inner cavity of the regulating tube (10).
5. The liquid level detection device for a liquid crystal glass melting furnace according to claim 1, characterized in that, The thermocouples (8) consist of two sets. Each set of thermocouples (8) is fixedly connected to a set of sleeves (15). Both sets of sleeves (15) are cylindrical in shape. The inner cavity of the sleeves (15) is threaded. The two sets of sleeves (15) are screwed to both ends of the same set of main screws (14).
6. The liquid level detection device for a liquid crystal glass melting furnace according to claim 1, characterized in that, A set of thermocouples (8) are fixedly connected to the liquid level tube (3) at 10mm intervals along the axial direction of the liquid level inside the tube (3), and the liquid level tube (3) is made of thermally conductive material.
7. The liquid level detection device for a liquid crystal glass melting furnace according to claim 1, characterized in that, The heat insulation component (4) consists of a heat-conducting plate (17), a heating wire (18), and a heat insulation plate (19). Both the heat-conducting plate (17) and the heat insulation plate (19) are cylindrical. An installation groove is opened on the inner side of the heat insulation plate (19). The axial section of the heat insulation plate (19) is U-shaped. The heating wire (18) is spirally arranged in the installation groove. Temperature sensors (5) are symmetrically connected to the surface of the heat-conducting plate (17).