Muffle furnace capable of reducing overflow method glass crystallization

Abstract

The utility model discloses a muffle furnace capable of reducing overflow method glass crystallization. Relates to the field of glass manufacturing, a side plate of a furnace body is connected with a heating device in a sliding mode in the horizontal direction, the heating device slides to move to the position below an overflow brick, and the heating device is further provided with a limiting assembly used for limiting sliding of the heating device; two movable baffles are further arranged in the furnace body, the two movable baffles are connected to a shell of the furnace body in a sliding mode in the horizontal direction, and the two movable baffles are arranged in the horizontal direction and slide to abut against the heating device to form a shielding layer; through the arrangement of the sliding shell, the position of the heating source can be changed, so that molten glass at the platinum baffle can be well heated under the condition that the power is not increased; the sliding shell and the movable baffle are matched for use, so that a shielding layer is formed, the influence of cold air flow is reduced, the temperature at the platinum baffle is ensured, and glass crystallization is reduced; and meanwhile, the heating influence of the furnace body is reduced.

Description

Technical Field

[0001] The present application relates to the field of glass manufacturing, and in particular to a muffle furnace capable of reducing overflow glass crystallization. Background Art

[0002] Overflow down-drawing is the main method for producing ultra-thin electronic glass for the display industry. The forming method is as follows: the high-temperature molten glass in the muffle furnace flows into the overflow trough of the overflow brick, and then overflows from both sides of the overflow trough. The overflowed glass flows down along the two side walls of the overflow brick and converges at the root of the overflow brick to form a glass strip. Finally, ultra-thin flat glass is formed under the action of the edge drawing machine and traction roller. Platinum baffles are set at both ends of the overflow brick to guide the high-temperature glass liquid to flow downward. Below the platinum baffle is an edge drawing machine to clamp and pull the glass.

[0003] Due to factors such as process temperature, the glass liquid is prone to crystallization under the platinum baffles on both sides. As the crystallization increases, it will eventually change the flow state of the glass liquid, affecting the quality of glass molding. In severe cases, it will cause a significant drop in the yield rate and even lead to production interruption.

[0004] The traditional solution is to insert a special heater from both ends of the furnace body, close to the platinum baffle, heat the baffle and increase its temperature. Due to the limitation of the equipment space, the heating efficiency of the designed heater is relatively low. If the heating power is increased blindly, an unreasonable temperature field will be formed, resulting in the reduction of the life of nearby metal parts. Therefore, crystallization will still occur. When the crystallization accumulates to a certain extent and affects production, the production process will generally be suspended, and a temporary, higher-power heater will be placed near the platinum baffle to increase the temperature of this area for sintering and crystallization. After the operation is completed, the high-power heater will be removed and the normal production process will be gradually restored. The operation is complicated, consumes a lot of manpower and material resources, and has a great impact on normal production operations. Utility Model Content

[0005] In order to effectively reduce glass crystallization while avoiding affecting the furnace structure, the present application provides a muffle furnace that can reduce overflow glass crystallization.

[0006] The present application provides a muffle furnace capable of reducing overflow glass crystallization, which adopts the following technical solution:

[0007] A muffle furnace capable of reducing overflow glass crystallization, wherein heating devices are slidably connected to the side plates at both ends of the furnace body in a horizontal direction, the heating devices slide to move below a platinum baffle, and the heating devices are also provided with a limit assembly for limiting their own sliding; two movable baffles are also provided in the furnace body, the two movable baffles are slidably connected to the outer shell of the furnace body in a horizontal direction, the two movable baffles are arranged in a horizontal direction and slide to approach the heating devices.

[0008] By adopting the above technical solution, when producing glass plates, the position and power of the heating device are adjusted according to the required temperature, so that the platinum baffle reaches a suitable temperature and the crystallization of the glass liquid is reduced. At the same time, in order to reduce the impact on the platinum baffle, the two movable baffles are then moved close to the heating device, thereby dividing the furnace body into two insulating spaces, eliminating the impact of the chimney effect cold air flow on the platinum baffle of the furnace body.

[0009] Optionally, the heating device includes a fixed shell, a sliding shell and a heating element, the fixed shell is fixedly connected to the side plate of the furnace body, and the sliding shell is slidably connected to the fixed shell in a horizontal direction; the sliding shell slides to move below the platinum baffle, and the heating element is arranged on the sliding shell.

[0010] By adopting the above technical solution, the sliding shell slides to change the position of the heating element.

[0011] Optionally, the sliding housing is also provided with a notch for the glass plate to pass through.

[0012] By adopting the above technical solution, the heating element can be brought closer to the platinum baffle.

[0013] Optionally, the limiting assembly includes a long screw and an adjusting nut, one end of the long screw is fixedly connected to the sliding shell, and the other end of the long screw passes through the fixed shell in a horizontal direction and is threadedly connected to the adjusting nut.

[0014] By adopting the above technical solution, when the position of the sliding shell needs to be changed, the adjusting nut is screwed so that it no longer abuts against the side plate of the furnace body, and then the position of the sliding shell can be adjusted to be closer to the glass plate.

[0015] Optionally, a heat insulating layer and a furnace plate are provided in the sliding shell, and the heat insulating layer, the furnace plate and the heating element are arranged in sequence from bottom to top.

[0016] By adopting the above technical solution, the thermal insulation layer isolates the heat transfer above and below the heating device, thereby avoiding affecting the platinum plate below.

[0017] Optionally, the heating element is a heating resistor, which passes through the fixed shell into the sliding shell and then passes through the fixed shell again after winding, and the heating resistors are evenly distributed on the side walls of the notch.

[0018] Optionally, the heating resistor is centrally coiled at one end of the sliding housing away from the fixed housing.

[0019] Optionally, the heating resistors are all provided with porcelain sleeves at the fixed shell.

[0020] By adopting the above technical solution, the heating resistors are concentrated and coiled at one end of the sliding shell, so that the side plate of the furnace body is as far away from the heat source as possible to avoid being affected.

[0021] In summary, this application includes the following beneficial technical effects:

[0022] The present application changes the position of the heat source by setting a sliding shell and a movable baffle, forming a shielding layer to reduce the influence of cold airflow, so that the glass liquid at the platinum baffle can be well heated without increasing the power, thereby reducing glass crystallization; at the same time, it also reduces the influence of heat on the furnace body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a side view of the overall structure of a muffle furnace capable of reducing crystallization of overflow-process flat glass in the present application;

[0024] Figure 2 yes Figure 1 The overall structure front view in FIG.

[0025] Figure 3 yes Figure 1 A top view of the structure of the heating device;

[0026] Figure 4 yes Figure 1 Structural axonometric diagram of the heating device.

[0027] Description of reference numerals:

[0028] 1. Furnace body; 11. Overflow brick; 12. Platinum baffle; 13. Pull edge wheel; 2. Heating device; 21. Fixed shell; 22. Sliding shell; 23. Insulation layer; 24. Furnace plate; 25. Heating element; 26. Long screw; 27. Adjusting nut; 28. Porcelain sleeve; 29. ​​Movable baffle; 3. Glass plate. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-4 This application is described in further detail.

[0030] The embodiment of the present application discloses a muffle furnace capable of reducing overflow glass crystallization. The furnace body comprises a heating device 2 capable of adjusting the lateral position and two movable baffles 29 . The heating device 2 and the movable baffles are both arranged between the edge drawing wheel 13 and the platinum baffle 12 .

[0031] refer to Figure 3 and Figure 4The heating device 2 includes a fixed shell 21, a sliding shell 22 and a heating element 25. The fixed shell 21 is fixedly connected to the side plate of the furnace body 1, and the sliding shell 22 is slidably connected to the fixed shell 21 in the form of a slide rail. A limit assembly for limiting the sliding of the sliding shell 22 is also provided between the fixed shell 21 and the sliding shell 22; the heating element 25 is a heating resistor, which passes through the sliding shell 22 from the fixed shell 21, is coiled in the sliding shell 22, and then passes through the fixed shell 21 again. At the same time, a power supply for supplying power to the heating resistor is provided outside.

[0032] At the same time, a notch is provided on the sliding shell 22 for the glass plate 3 to pass through, and heating resistors are coiled on the side walls of the notch, so that the heating resistors are as close as possible to the bottom of the platinum baffle (12) to obtain a larger heat radiation area; in order to keep the heat source as far away from the shell of the furnace body as possible, the heating resistors are concentrated and coiled on the end of the sliding shell 22 away from the fixed shell 21.

[0033] In this embodiment, the limiting assembly includes an adjusting nut 27 and a long screw 26, one end of the long screw 26 is fixedly connected to the sliding shell 22, and the other end passes through the fixed shell 21 and is threadedly connected to the adjusting nut 27; when the position of the sliding shell 22 needs to be changed, the adjusting nut 27 is rotated so that it no longer abuts against the fixed shell 21, so as to drive the sliding shell 22 to slide, thereby making it go deeper.

[0034] In order to increase the service life of the heating device 2, an insulating layer 23 and a furnace plate 24 are also provided in the sliding shell 22. The insulating layer 23, the furnace plate 24 and the heating element 25 are arranged in sequence from bottom to top. At the same time, a porcelain sleeve 28 is provided at the connection between the heating resistor and the fixed shell 21 for thermal insulation.

[0035] The two movable baffles 29 are arranged in a horizontal direction, and the two movable baffles 29 slide to approach or move away from the heating device 2; when the two movable baffles 29 abut the heating device 2, the furnace body 1 is divided into two parts, the upper part and the lower part; the temperature in the space is relatively high, and the temperature in the lower part is relatively low. In this case, due to the chimney effect, the cold air flows upward. Under the platinum baffle 12, the heating device 2 and the movable baffles 29 on both sides together form a shielding layer, which prevents the cold air from rising and eliminates the influence of the cold air on the temperature of the platinum baffle 12 area.

[0036] Generally, the edge pulley 13 is provided with cooling, and the temperature near it is relatively low. This relatively low temperature field will also bring a cooling effect to the platinum baffle 12 above; and there is a heat insulation layer 23 below the heating device 2, and the movable baffles 29 on both sides are also filled with heat insulation materials, which have relatively low thermal conductivity coefficients, and can effectively prevent the conduction of temperature above and below, forming a mutually isolated temperature field, and minimizing the influence of the low temperature field below on the temperature of the platinum baffle 12 area.

[0037] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A muffle furnace capable of reducing overflow glass crystallization, characterized in that: A heating device (2) is slidably connected to the side plates at both ends of the furnace body (1) in a horizontal direction, and the heating device (2) slides to move below the platinum baffle plate. The heating device is also provided with a limit assembly for limiting its own sliding. The furnace body (1) is also provided with two movable baffle plates (29), and the two movable baffle plates (29) are slidably connected to the outer shell of the furnace body (1) in a horizontal direction. The two movable baffle plates (29) are arranged in a horizontal direction and slide to approach the heating device (2).

2. A muffle furnace capable of reducing overflow glass crystallization according to claim 1, characterized in that: The heating device comprises a fixed shell (21), a sliding shell (22) and a heating element (25); the fixed shell (21) is fixedly connected to a side plate of a furnace body (1); the sliding shell (22) is slidably connected to the fixed shell (21) in a horizontal direction; the sliding shell (22) slides to move below a platinum baffle (12); and the heating element (25) is arranged on the sliding shell (22).

3. A muffle furnace capable of reducing overflow glass crystallization according to claim 2, characterized in that: The sliding housing (22) is also provided with a notch for the glass plate to pass through.

4. A muffle furnace capable of reducing overflow glass crystallization according to claim 2, characterized in that: The limiting assembly comprises a long screw rod (26) and an adjusting nut (27), one end of the long screw rod (26) is fixedly connected to the sliding housing (22), and the other end of the long screw rod (26) passes through the fixed housing (21) in a horizontal direction and is threadedly connected to the adjusting nut (27).

5. A muffle furnace capable of reducing overflow glass crystallization according to claim 2, characterized in that: A heat insulating layer (23) and a furnace plate (24) are provided in the sliding shell (22), and the heat insulating layer (23), the furnace plate (24) and the heating element (25) are arranged in sequence from bottom to top.

6. A muffle furnace capable of reducing overflow glass crystallization according to claim 3, characterized in that: The heating element (25) is a heating resistor, which passes through the fixed shell (21) into the sliding shell (22), is coiled, and then passes through the fixed shell (21) again. The side walls of the notch are evenly distributed with heating resistors.

7. A muffle furnace capable of reducing overflow glass crystallization according to claim 6, characterized in that: The heating resistor is centrally coiled at one end of the sliding housing (22) away from the fixed housing (21).

8. A muffle furnace capable of reducing overflow glass crystallization according to claim 6, characterized in that: The heating resistors are all sleeved with porcelain sleeves (28) at the fixed housing.

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