Temperature control structure for crystalline region of glass ceramic roller kiln

Abstract

The utility model discloses a temperature control structure for a crystallization area of a glass ceramic roller kiln, which is characterized in that a heat exchange tube is arranged in the crystallization area of the roller kiln, and two ends of the heat exchange tube extend out of the roller kiln and are used for introducing and discharging cooling gas; during use, when a glass workpiece reaches a crystallization temperature in a crystallization area and begins to crystallize and release heat, cooling gas is introduced into the heat exchange tube from the gas inlet end and is discharged from the gas outlet end, so that cooling gas flow is formed in the heat exchange tube, and the heat exchange tube is kept at a lower temperature than the crystallization area; heat in the crystallization area is transferred to the cooling airflow through the heat exchange pipe and is taken away from the roller kiln; the temperature and the flow speed of cooling airflow can be adjusted according to production conditions, so that the temperature control structure exerts a proper temperature control effect, absorbs redundant heat generated by crystallization heat release, enables the temperature of a crystallization area to be maintained for crystallization, and can effectively solve the problem that the crystallization area of an existing roller kiln is easy to overheat. And the quality stability and yield of the microcrystalline glass product can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of special devices for heating kilns, and in particular relates to a temperature control structure for a crystallization zone of a glass-ceramic roller kiln. Background Art

[0002] Glass-ceramics is a basic glass composed of specific components. Crystallization is an important step in the production of glass-ceramics. This step involves performing crystallization heat treatment under a certain temperature regime to uniformly precipitate a large number of tiny crystals in the glass, forming a dense multiphase complex of microcrystalline phase and glass phase and releasing heat.

[0003] Microcrystalline glass production requires the use of kilns as heat treatment equipment. Roller kilns are one of the most common heat treatment equipment for microcrystalline glass production. They can be divided into multiple temperature zones, including preheating zone, crystallization zone and cooling zone. Both the preheating zone and the crystallization zone are equipped with heating elements to heat the glass workpieces passing through. However, if Figure 1 As shown, since the glass workpiece releases a lot of heat when it crystallizes to form crystals at the crystallization temperature, even if the heating element in the crystallization zone heats the glass workpiece to the temperature required for crystallization and stops heating in time, it is easy for the kiln itself to dissipate heat slowly, causing the temperature of the crystallization zone to be higher than the temperature required for crystallization for a certain period of time, especially when the heat release is huge in batch production; the fluctuation of the crystallization temperature during the production of microcrystalline glass will seriously affect the stability and yield of the quality of microcrystalline glass products. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present utility model is to provide a temperature control structure for the crystallization zone of a microcrystalline glass roller kiln, so as to solve the technical problem that the crystallization zone of the existing roller kiln is prone to overheating, and to achieve the effect of improving the quality stability and yield of microcrystalline glass products.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A temperature control structure for the crystallization zone of a microcrystalline glass roller kiln includes a heat exchange tube arranged in the crystallization zone of the roller kiln, with both ends of the heat exchange tube extending out of the roller kiln respectively. One end of the heat exchange tube is an air inlet end for introducing cooling gas, and the other end of the heat exchange tube is an air outlet end for discharging the cooling gas after absorbing heat.

[0007] Furthermore, the air inlet end or the air outlet end of the heat exchange tube is connected to a fan.

[0008] Furthermore, a fan is provided at the air outlet end of the heat exchange tube.

[0009] Furthermore, a pressure stabilizing valve is provided on the heat exchange tube near the gas outlet end.

[0010] Furthermore, there are multiple heat exchange tubes and the air outlet ends of the heat exchange tubes are commonly connected to a hot air collecting tube, and the fan is arranged on the hot air collecting tube.

[0011] Furthermore, there are multiple heat exchange tubes and the air inlet ends of the heat exchange tubes are commonly connected to an air intake collecting pipe.

[0012] Furthermore, an upper heating element and a lower heating element are provided in the crystallization zone of the roller kiln, and the upper heating element and the lower heating element are respectively arranged above and below the driving roller of the roller kiln.

[0013] Furthermore, the heat exchange tube is horizontally arranged between the upper heating element and the driving roller of the roller kiln.

[0014] Furthermore, the temperature control structure also includes a thermocouple, and the detection end of the thermocouple is located in the crystallization zone of the roller kiln.

[0015] Furthermore, the temperature control structure also includes a controller, which is electrically connected to the fan, the upper heating element, the lower heating element and the thermocouple respectively.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The crystallization zone of the microcrystalline glass roller kiln described in the utility model uses a temperature control structure, and a heat exchange tube is arranged in the crystallization zone of the roller kiln. The two ends of the heat exchange tube extend out of the roller kiln and are used to pass and discharge cooling gas; the temperature and flow rate of the cooling air flow can be adjusted according to production conditions, so that the temperature control structure can play a suitable temperature control effect, absorb the excess heat generated by crystallization exothermicity, and maintain the temperature of the crystallization zone required for crystallization. It can effectively solve the problem that the crystallization zone of the existing roller kiln is prone to overheating, which is beneficial to improving the stability and yield of the quality of microcrystalline glass products.

[0018] 2. The temperature control structure used in the crystallization zone of the microcrystalline glass roller kiln described in the present invention is a fan that is arranged at the air inlet or outlet end of the heat exchange tube. Not only can the flow rate of the cooling air flow be adjusted by controlling the fan speed, thereby adjusting the temperature control effect of the temperature control structure, but the fan can also increase the flow rate of the cooling air flow in the heat exchange tube, which is beneficial to improving the temperature control ability of the temperature control structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of differential thermal analysis of glass-ceramics;

[0020] Figure 2 Schematic top view of the temperature control structure for the crystallization zone of the glass-ceramics roller kiln described in the embodiment;

[0021] Figure 3 Schematic side view of the temperature control structure (some components are hidden) used in the crystallization zone of the glass-ceramics roller furnace described in the embodiment;

[0022] Among them, there are crystallization zone 1, heat exchange tube 2, air inlet end 3, air outlet end 4, fan 5, pressure regulating valve 6, hot air collecting pipe 7, air inlet collecting pipe 8, upper heating element 9, lower heating element 10, transmission roller 11, glass workpiece 12, thermocouple 13, roller kiln 14. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0024] Example:

[0025] See Figure 2 A temperature control structure for the crystallization zone of a microcrystalline glass roller kiln includes a heat exchange tube 2 arranged in the crystallization zone 1 of the roller kiln 14. In this embodiment, the heat exchange tube 2 is a silicon carbide heat exchange tube 2; both ends of the heat exchange tube 2 extend out of the roller kiln 14, one end of the heat exchange tube 2 is an air inlet end 3 for introducing cooling gas, and the other end of the heat exchange tube 2 is an air outlet end 4 for discharging the cooling gas after absorbing heat.

[0026] The temperature control structure of the crystallization zone of the microcrystalline glass roller kiln described in the present invention is that a heat exchange tube 2 is set in the crystallization zone 1 of the roller kiln 14, and both ends of the heat exchange tube 2 extend out of the roller kiln 14 and are used for passing and discharging cooling gas; when in use, when the glass workpiece 12 reaches the crystallization temperature in the crystallization zone 1 and starts to release heat through crystallization, cooling gas is passed into the heat exchange tube 2 from the air inlet end 3 and discharged from the air outlet end 4, so that a cooling airflow is formed in the heat exchange tube 2, so that the heat exchange tube 2 maintains a lower temperature than that of the crystallization zone 1, and the heat in the crystallization zone 1 is transferred to the cooling airflow through the heat exchange tube 2 and taken away from the roller kiln 14; the temperature and flow rate of the cooling airflow can be adjusted according to production conditions, so that the temperature control structure can play an appropriate temperature control effect, absorb the excess heat generated by the crystallization heat release, and maintain the temperature of the crystallization zone 1 required for crystallization, which can effectively solve the problem that the crystallization zone 1 of the existing roller kiln is prone to overheating, which is beneficial to improving the stability and yield of the quality of microcrystalline glass products.

[0027] See Figure 2The air inlet end 3 or the air outlet end 4 of the heat exchange tube 2 is connected to the fan 5; in this way, the fan 5 is set at the air inlet end 3 or the air outlet end 4 of the heat exchange tube 2, which can not only adjust the flow rate of the cooling air flow by controlling the speed of the fan 5, thereby adjusting the temperature control effect of the temperature control structure, but also the fan 5 can increase the flow rate of the cooling air flow in the heat exchange tube 2, which is beneficial to improving the temperature control ability of the temperature control structure. Specifically in this embodiment, the fan 5 is arranged at the air outlet end 4 of the heat exchange tube 2; in this way, the fan 5 is arranged at the air outlet end 4 of the heat exchange tube 2, and the cooling gas is directly drawn away by the fan 5 after passing through the heat exchange tube 2. Compared with setting the fan 5 at the air inlet end 3, the resistance to be overcome is smaller, which is beneficial to reducing energy consumption; in addition, if the fan 5 is set at the air inlet end 3, the cooling gas may be affected by the fan 5 before entering the heat exchange tube 2, generating eddy currents or uneven flow fields, thereby affecting the heat exchange efficiency, while setting the fan 5 at the air outlet end 4 can reduce this influence, so that the cooling gas can pass through the heat exchange tube 2 more smoothly, which is beneficial to improving the heat exchange effect.

[0028] See Figure 2 A pressure-stabilizing valve 6 is provided on the heat exchange tube 2 near the air outlet end 4. In this way, providing the pressure-stabilizing valve 6 in front of the fan 5 is conducive to maintaining pressure stability, ensuring that the fan 5 can operate within a suitable pressure range, avoiding damage to the fan 5 due to excessive pressure, and helping to improve the working efficiency and service life of the fan 5.

[0029] See Figure 2 There are multiple heat exchange tubes 2 and the air outlet ends 4 of each heat exchange tube 2 are commonly connected to the hot air collecting pipe 7, and the fan 5 is arranged on the hot air collecting pipe 7; in this embodiment, the hot air collecting pipe 7 is made of S304 stainless steel; in this way, the provision of multiple heat exchange tubes 2 is conducive to improving the temperature control ability and efficiency of the temperature control structure, and each heat exchange tube 2 is commonly connected to the hot air collecting pipe 7 to facilitate unified processing or recovery of the cooling gas after heat absorption. Each heat exchange tube 2 shares a fan 5 through the hot air collecting pipe 7, which is conducive to improving the utilization rate of the fan 5.

[0030] See Figure 2 There are multiple heat exchange tubes 2 and the air inlet ends 3 of each heat exchange tube 2 are commonly connected to the air inlet collecting pipe 8; in this way, each heat exchange tube 2 is commonly connected to the air inlet collecting pipe 8 to facilitate the unified introduction of cooling gas, and the cooling gas enters each heat exchange tube 2 through the air inlet collecting pipe 8, so that the air intake of each heat exchange tube 2 is more uniform and stable, and the cooling gas passes through the heat exchange tube 2 more smoothly, which is beneficial to improving the heat exchange effect.

[0031] See Figure 3An upper heating element 9 and a lower heating element 10 are provided in the crystallization zone 1 of the roller kiln 14, and the upper heating element 9 and the lower heating element 10 are respectively provided above and below the drive roller 11 of the roller kiln 14; in this way, a heating element is provided in the crystallization zone 1 to heat the glass workpiece 12 in the crystallization zone 1 to the crystallization temperature and maintain it, and the temperature of the crystallization zone 1 can be flexibly adjusted in conjunction with the heat exchange tube 2 to meet production needs; the upper heating element 9 and the lower heating element 10 are respectively provided above and below the drive roller 11, which not only makes the glass workpiece 12 heated more evenly, which is beneficial to improving the crystallization quality, but also the double-sided heating can increase the heating speed and the temperature rise response is faster, which is beneficial to meeting more production needs.

[0032] See Figure 3 The heat exchange tube 2 is horizontally arranged between the upper heating element 9 and the drive roller 11 of the roller kiln 14; in this way, unlike the heating element heating the glass workpiece 12 by thermal radiation, the heat exchange tube 2 absorbs the heat of the crystallization zone 1 mainly by contact with the high-temperature gas to achieve heat exchange; the heat exchange tube 2 is horizontally arranged between the heating element and the drive roller 11, so that its entirety is closer to the glass workpiece 12, which is conducive to quickly reducing the temperature around the glass workpiece 12, so as to control the temperature of the glass workpiece 12 to maintain the temperature required for crystallization.

[0033] See Figure 3 The temperature control structure also includes a thermocouple 13, and the detection end of the thermocouple 13 is located in the crystallization zone 1 of the roller kiln 14. In this way, during production, the temperature of the crystallization zone 1 can be obtained in real time through the thermocouple 13, so that after reaching the crystallization temperature, the upper heating element 9 and the lower heating element 10 can be promptly controlled to stop heating, and the fan 5 can be controlled to work and cooperate with the heat exchange tube 2 to absorb the excess heat generated by crystallization in the crystallization zone 1, so that the temperature of the crystallization zone 1 is maintained stable, which is conducive to improving the practicality of the temperature control structure.

[0034] In addition, the temperature control structure also includes a controller (not shown in the figure), which is electrically connected to the fan 5, the upper heating element 9, the lower heating element 10 and the thermocouple 13 respectively; in this way, when in use, the temperature data can be preset in the controller, so that the controller can automatically control the start and stop of the upper heating element 9, the lower heating element 10 and the fan 5 as well as the power according to the temperature electrically fed back by the thermocouple 13, replacing manual operation, making the temperature of the crystallization heat treatment more stable and uniform, which is beneficial to improving the stability and yield of the quality of the microcrystalline glass products.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Ordinary technicians in this field should understand that those modifications or equivalent replacements of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A temperature control structure for the crystallization zone of a glass-ceramic roller kiln, characterized by: It includes a heat exchange tube arranged in the crystallization zone of the roller kiln. Both ends of the heat exchange tube extend out of the roller kiln respectively. One end of the heat exchange tube is the air inlet end for introducing cooling gas, and the other end of the heat exchange tube is the air outlet end for discharging the cooling gas after absorbing heat.

2. The temperature control structure for the crystallization zone of a glass-ceramics roller kiln according to claim 1, characterized in that: The air inlet end or the air outlet end of the heat exchange tube is connected to a fan.

3. The temperature control structure for the crystallization zone of a glass-ceramics roller kiln according to claim 2, characterized in that: The fan is arranged at the air outlet end of the heat exchange tube.

4. The temperature control structure for the crystallization zone of a glass-ceramics roller kiln according to claim 3, characterized in that: A pressure stabilizing valve is provided on the heat exchange tube near the gas outlet end.

5. The temperature control structure for the crystallization zone of a glass-ceramics roller kiln according to claim 2, characterized in that: There are multiple heat exchange tubes and the air outlet ends of the heat exchange tubes are commonly connected to a hot air collecting tube, and the fan is arranged on the hot air collecting tube.

6. The temperature control structure for the crystallization zone of a glass-ceramics roller furnace according to claim 2, characterized in that: There are multiple heat exchange tubes and the air inlet ends of the heat exchange tubes are commonly connected to an air inlet collecting pipe.

7. The temperature control structure for the crystallization zone of a glass-ceramics roller kiln according to claim 2, characterized in that: An upper heating element and a lower heating element are provided in the crystallization zone of the roller kiln. The upper heating element and the lower heating element are respectively arranged above and below the driving roller of the roller kiln.

8. The temperature control structure for the crystallization zone of a glass-ceramics roller furnace according to claim 7, characterized in that: The heat exchange tubes are arranged horizontally between the upper heating element and the driving roller of the roller kiln.

9. The temperature control structure for the crystallization zone of a glass-ceramics roller furnace according to claim 7, characterized in that: The temperature control structure further comprises a thermocouple, and the detection end of the thermocouple is located in the crystallization zone of the roller kiln.

10. The temperature control structure for the crystallization zone of a glass-ceramics roller furnace according to claim 9, characterized in that: The temperature control structure further includes a controller, which is electrically connected to the fan, the upper heating element, the lower heating element and the thermocouple respectively.

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