A crystallization furnace for producing microcrystalline glass

Abstract

The utility model belongs to the field of microcrystalline glass production technology, disclose a kind of crystallization furnace for microcrystalline glass production, including furnace body, heating system, control system and the load trolley for carrying glass product, multiple independent heating zones are evenly separated in furnace body inner cavity along horizontal direction, and the top and bottom of each heating zone are provided with independent heating unit and temperature sensor;Load trolley includes frame, refractory load-bearing plate and multilayer flow guide cover installed on frame;The bottom of furnace body is equipped with air distribution cavity, and the top of furnace body is equipped with air collection cavity, and outside centrifugal fan is connected by air pipe with air collection cavity and air distribution cavity, and constitutes forced hot air circulation mechanism.The utility model is through multiple independent heating zone, furnace door auxiliary heating, flow guide cover forced circulation and closed air path design, realize the high uniformity of temperature field inside hearth, and can improve the precision of temperature difference control, can guarantee the consistency of microcrystalline glass crystallization process simultaneously, to improve yield.

Description

Technical Field

[0001] This utility model relates to the field of microcrystalline glass production technology, and in particular to a crystallization furnace for microcrystalline glass production. Background Technology

[0002] Glass-ceramics are high-performance materials produced by controlled crystallization of glass with a specific composition. The production process mainly includes steps such as melting, forming, nucleation and crystallization. Among them, crystallization heat treatment is the key process that determines the final properties of glass-ceramics (such as strength, heat resistance, transparency, etc.).

[0003] Most existing crystallization furnaces adopt traditional box-type or tunnel-type resistance furnaces. Their working principle is to heat the entire furnace chamber through heating elements so that the glass products placed inside reach and maintain the crystallization temperature. However, these traditional crystallization furnaces have the following problems: 1) Poor temperature uniformity: There is an unavoidable temperature gradient in the furnace chamber, which leads to uneven crystallization degree in different parts of the same batch or even the same workpiece, which seriously affects the consistency of products and yield; 2) High energy consumption: In order to maintain the high temperature environment of the entire furnace chamber, a large amount of energy needs to be continuously consumed, resulting in low thermal efficiency. Therefore, we propose a crystallization furnace for the production of microcrystalline glass. Utility Model Content

[0004] In view of the problems of poor temperature uniformity and high energy consumption in the existing crystallization furnaces, this utility model is proposed.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A crystallization furnace for producing microcrystalline glass includes a furnace body, a heating system, a control system, and a carrying trolley for carrying glass products. The inner cavity of the furnace body is evenly divided into multiple independent heating zones along the horizontal direction, and each heating zone is provided with an independent heating unit and a temperature sensor at its top and bottom.

[0007] The carrying trolley includes a frame, a fire-resistant load-bearing plate mounted on the frame, and a multi-layered flow guide that vertically penetrates the fire-resistant load-bearing plate;

[0008] The bottom of the furnace body is equipped with an air distribution chamber, and the top of the furnace body is equipped with an air collection chamber. An external centrifugal fan connects the air collection chamber and the air distribution chamber through an air duct, forming a forced hot air circulation mechanism.

[0009] As a technical solution for a crystallization furnace for producing microcrystalline glass according to the present invention, the furnace door on the furnace body is also equipped with a heating unit and a temperature sensor corresponding to the internal structure of the furnace chamber.

[0010] As a technical solution for a crystallization furnace for microcrystalline glass production according to the present invention, the heating unit is a resistance heating rod, and the power of the heating unit is independently adjusted by the control system according to the feedback of the corresponding temperature sensor.

[0011] As a technical solution for a crystallization furnace for microcrystalline glass production according to the present invention, the flow guide is a honeycomb cylindrical structure that runs vertically through the top and bottom, and an independent airflow channel is formed inside the flow guide.

[0012] As a technical solution for a crystallization furnace for microcrystalline glass production according to the present invention, the upper port of the flow guide hood is opposite to the lower surface of the air collecting chamber, and the lower port of the flow guide hood is opposite to the upper surface of the air distribution chamber, so that hot air, driven by the external centrifugal fan, flows sequentially through the air collecting chamber, the airflow channel, the workpiece gap on the carrying trolley, and the air distribution chamber, and then returns to the air collecting chamber through the air duct, forming a closed loop mechanism.

[0013] As a technical solution for a crystallization furnace for microcrystalline glass production according to the present invention, the upper surface of the refractory load-bearing plate is provided with a pad for positioning glass products, and the pad is made of refractory material.

[0014] As a technical solution for a crystallization furnace for microcrystalline glass production according to the present invention, the air duct is externally covered with a heat insulation layer.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] 1. This utility model achieves a highly uniform temperature field inside the furnace by using multiple independent heating zones, auxiliary heating at the furnace door, forced circulation through the guide hood, and a closed air path design. It also improves the accuracy of temperature difference control and ensures the consistency of the microcrystalline glass crystallization process, thereby increasing the yield.

[0017] 2. This utility model, through the forced hot air circulation mechanism combined with the design of zoned dynamic temperature control and insulation layer, can improve the utilization rate of thermal energy and significantly reduce energy consumption compared with traditional crystallization furnaces, so as to meet the requirements of green manufacturing. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0019] Figure 1This is a schematic diagram of the main structure of this utility model.

[0020] Figure 2 This is a side view of the structure of this utility model.

[0021] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] In the diagram: 1. Furnace body; 2. Furnace door; 3. Heating unit; 4. Temperature sensor; 501. Frame; 502. Refractory load-bearing plate; 503. Draft hood; 504. Airflow channel; 505. Pad; 6. Air distribution chamber; 7. Air collection chamber; 8. Air duct; 801. Insulation layer. Detailed Implementation

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0025] Reference Figures 1-3 A crystallization furnace for producing microcrystalline glass is provided. This crystallization furnace for producing microcrystalline glass includes a furnace body 1, a heating system, a control system (using a PLC integrated temperature control module to receive data from temperature sensors 4 in each heating zone in real time, dynamically adjust the power of the corresponding heating unit 3, and control the accuracy within ±1℃), and a carrying trolley for carrying glass products. The inner cavity of the furnace body 1 is evenly divided into multiple independent heating zones (such as 5 independent heating zones, namely a preheating zone, a nucleation zone, and a crystallization zone), and each heating zone is provided with an independent heating unit 3 and a temperature sensor 4 (such as a thermocouple sensor) at the top and bottom.

[0026] The trolley includes a frame 501, a fire-resistant load-bearing plate 502 mounted on the frame 501, and a multi-layered flow guide 503 that vertically penetrates the fire-resistant load-bearing plate 502.

[0027] The bottom of the furnace body 1 is equipped with an air distribution chamber 6, and the top of the furnace body 1 is equipped with an air collection chamber 7. An external centrifugal fan connects the air collection chamber 7 and the air distribution chamber 6 through an air duct 8, forming a forced hot air circulation mechanism. The external centrifugal fan is a variable frequency fan, and its speed is controlled by the control system according to different stages of the crystallization process curve. In application, through the design of multiple independent heating zones in the inner cavity of the furnace body 1, combined with the independent heating units 3 at the top and bottom and the temperature sensors 4, precise temperature control by zone is achieved. At the same time, the forced hot air circulation mechanism (linkage of air distribution chamber 6, air collection chamber 7, and external centrifugal fan) enhances the hot air convection efficiency, reduces the temperature gradient, and reduces energy consumption.

[0028] Reference Figure 1 and Figure 3The furnace door 2 on the furnace body 1 is also equipped with a heating unit 3 and a temperature sensor 4 corresponding to the internal structure of the furnace chamber. In application, the addition of heating unit 3 and temperature sensor 4 to the furnace door 2 makes up for the defect of low temperature in the furnace door area of ​​traditional crystallization furnace, and can further improve the overall temperature uniformity of the furnace chamber.

[0029] Reference Figure 1 and Figure 3 The heating unit 3 is a resistance heating rod, and the power of the heating unit 3 is independently adjusted by the control system according to the feedback of the corresponding temperature sensor 4. In application, the resistance heating rod combined with independent power adjustment can dynamically adjust the heating intensity according to the real-time temperature feedback, avoid local overheating or underheating, ensure crystallization stability, and reduce ineffective energy consumption.

[0030] Reference Figure 3 The air guide shroud 503 is a honeycomb cylindrical structure that runs vertically through the interior, and an independent airflow channel 504 is formed inside the air guide shroud 503. The upper port of the air guide shroud 503 is opposite to the lower surface of the air collecting chamber 7, and the lower port of the air guide shroud 503 is opposite to the upper surface of the air distribution chamber 6. This allows the hot air to flow sequentially through the air collecting chamber 7, the airflow channel 504, the gap between the workpieces on the carrying trolley, and the air distribution chamber 6 under the drive of the external centrifugal fan, and then return to the air collecting chamber 7 through the air duct 8, forming a closed loop mechanism. In application, the honeycomb air guide shroud 503 and the closed loop path design allow the hot air to penetrate the gaps in the glass products evenly, eliminate airflow dead zones, significantly improve crystallization uniformity, and at the same time reuse heat energy through the circulation mechanism to reduce heat loss.

[0031] Reference Figure 3 The upper surface of the fire-resistant load-bearing plate 502 is provided with a pad 505 for positioning glass products, and the pad 505 is made of fire-resistant material. In application, the fire-resistant positioning pad 505 can reduce heat conduction loss and ensure the stability of the workpiece spacing, avoiding the impact of improper stacking on airflow distribution.

[0032] Reference Figure 2 The outside of the air duct 8 is covered with an insulation layer 801. In application, the insulation layer 801 on the outside of the air duct 8 can effectively reduce heat loss and improve thermal efficiency.

[0033] The working principle of this utility model is as follows: Loading stage operation: First, place the microcrystalline glass blank on the refractory pad 505 of the carrying trolley to ensure that there is a uniform gap between the workpieces. Then, push the carrying trolley into the furnace chamber of the furnace body 1, close the furnace door 2, and start the heating unit 3.

[0034] Heating and crystallization stage:

[0035] Preheating stage: The control system starts the first heating zone (preheating zone) and heats up to 450℃ at a rate of 5℃ / min;

[0036] Nucleation stage: The second and third heating zones are heated to 680℃ (nucleation temperature) and held at that temperature for a period of time (e.g., 1 hour).

[0037] Crystallization stage: The fourth and fifth heating zones are heated to 950℃ (crystallization peak) and kept at that temperature for a period of time (e.g., 2 hours), while the external centrifugal fan is simultaneously started to force hot air circulation;

[0038] Cooling and unloading operations: First, shut down the heating system, and let the external centrifugal fan continue to run until the furnace temperature drops below 300°C. Then, open furnace door 2, remove the carrying trolley, and take out the finished microcrystalline glass.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A crystallization furnace for producing microcrystalline glass, comprising a furnace body (1), a heating system, a control system, and a carrying trolley for carrying glass products, characterized in that: The furnace body (1) has multiple independent heating zones evenly divided in the horizontal direction, and each heating zone is provided with an independent heating unit (3) and a temperature sensor (4) at the top and bottom. The carrying trolley includes a frame (501), a fire-resistant load-bearing plate (502) mounted on the frame (501), and a multi-layer flow guide (503) that vertically penetrates the fire-resistant load-bearing plate (502). The bottom of the furnace body (1) is equipped with an air distribution chamber (6), and the top of the furnace body (1) is equipped with an air collection chamber (7). An external centrifugal fan connects the air collection chamber (7) and the air distribution chamber (6) through an air duct (8) to form a forced hot air circulation mechanism.

2. The crystallization furnace for producing microcrystalline glass according to claim 1, characterized in that: The furnace door (2) on the furnace body (1) is also equipped with a heating unit (3) and a temperature sensor (4) corresponding to the internal structure of the furnace chamber.

3. The crystallization furnace for producing microcrystalline glass according to claim 1, characterized in that: The heating unit (3) is a resistance heating rod, and the power of the heating unit (3) is independently adjusted by the control system according to the feedback of the corresponding temperature sensor (4).

4. The crystallization furnace for producing microcrystalline glass according to claim 1, characterized in that: The air guide (503) is a honeycomb cylindrical structure that runs vertically through the air guide (503), and an independent airflow channel (504) is formed inside the air guide (503).

5. The crystallization furnace for producing microcrystalline glass according to claim 4, characterized in that: The upper port of the air guide hood (503) is opposite to the lower surface of the air collecting chamber (7), and the lower port of the air guide hood (503) is opposite to the upper surface of the air distribution chamber (6), so that the hot air, driven by the external centrifugal fan, flows sequentially through the air collecting chamber (7), the airflow channel (504), the workpiece gap on the carrying trolley, and the air distribution chamber (6), and then returns to the air collecting chamber (7) through the air duct (8), forming a closed loop mechanism.

6. The crystallization furnace for producing microcrystalline glass according to claim 1, characterized in that: The upper surface of the fire-resistant load-bearing plate (502) is provided with a pad (505) for positioning glass products, and the pad (505) is made of fire-resistant material.

7. The crystallization furnace for producing microcrystalline glass according to claim 1, characterized in that: The air duct (8) is covered with an insulation layer (801).

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