Method for avoiding blockage of glass plate during high-temperature flushing or high-temperature wetting of muffle furnace overflow bricks

Abstract

The present invention discloses a method for avoiding blockage of glass plates during high-temperature flushing or high-temperature wetting of the overflow bricks of a muffle furnace, which relates to the technical field of glass production. The technical solution is as follows: Insert a cooling water pipe into area B2 of the shaping furnace, so that the temperature of area B1 of the shaping furnace is 1080 ± 20 °C, the temperature of area B2 is 980 ± 20 °C, the temperature of area C1 of the annealing furnace is 900 ± 20 °C, and the temperature of area C2 is 800 ± 20 °C. During the high-temperature wetting or high-temperature flushing process of forming, the present invention can well avoid the blockage phenomenon caused by the rotation of the traction rollers in the annealing furnace winding glass by inserting a cooling water pipe into area B2 of the shaping furnace, adjusting the temperatures of different areas of the shaping furnace and the annealing furnace, and adjusting the parameters of the traction rollers of the annealing furnace.

Description

Technical Field

[0001] The present invention relates to the technical field of glass production, and particularly relates to a method for avoiding blockage of glass plates during high-temperature flushing or high-temperature wetting of the muffle furnace overflow bricks. Background Art

[0002] During the production process of liquid crystal glass substrate forming equipment, in order to address some defects, such as addressing crystallization of the bus bar, addressing platinum needles, addressing silicon zirconium stones, etc., a high-temperature flushing method is often adopted to achieve the purpose of addressing the above defects. High-temperature flushing means raising the temperature inside the muffle furnace, and the temperature inside the furnace can reach above 1275°C. Through the erosion and flushing of the flowing glass liquid at a higher temperature on the bus bar and the overflow bricks, the above defects can be eliminated. However, when the high-temperature flushing method is adopted, it is very easy to cause blockage. Because after raising the temperature of the muffle furnace, the temperature of the glass liquid inside the muffle furnace is also very high, reaching above 1275°C. The glass liquid flows down from the bottom of the overflow brick. Since the temperature of the glass plate is very high and the viscosity is low, the traction rollers in the annealing furnace cannot hold it. When the glass plate flows down from the bottom of the overflow brick, the flow rate is very fast. When the glass plate flows through positions such as the shaping furnace and the annealing furnace, it flows freely by gravity. If no better method is adopted, the glass plate is very likely to be folded and stacked in the furnace, resulting in blockage in the shaping furnace and the annealing furnace. If not handled in time, more and more hot glass will accumulate in the furnace, quickly causing blockage. The hot glass will fill the annealing furnace completely. If not handled in time, the hot glass will continue to accumulate to the shaping furnace and even into the muffle furnace, causing great losses. Once blockage occurs, the following problems will arise: 1) The kiln feeder stops feeding; 2) The platinum channel must discharge from the stirring tank and stop supplying materials to the forming equipment; 3) After the forming stops flowing, when dealing with the broken glass at the blockage point, since the hot glass accumulates together to form spherical glass balls, it is not easy to handle and needs to be shoveled little by little for a long time. After the treatment is completed, the forming equipment still has to be re-wetted, resulting in at least a one-week loss. Therefore, once blockage occurs, it will seriously affect normal production and cause significant economic losses. Therefore, there is an urgent need to provide a method for avoiding blockage of glass plates during high-temperature flushing or high-temperature wetting of the muffle furnace overflow bricks to solve the above problems. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art and provide a method for avoiding blockage of glass plates during high-temperature flushing or high-temperature wetting of the muffle furnace overflow bricks, which can not only ensure the expected effects of high-temperature wetting and high-temperature flushing during high-temperature wetting and high-temperature flushing, but also avoid the occurrence of blockage caused by the traction rollers winding the glass.

[0004] When forming high-temperature wetting or high-temperature flushing overflow bricks, the glass temperature on the overflow bricks is above 1275 °C, and the glass liquid flows down from the tip of the overflow brick. The temperature of the brick tip is above 1235 °C, and it enters the shaping furnace to form a glass ribbon. Since there is no edge puller installed in the muffle furnace at high temperature, the glass ribbon is not clamped by the edge puller and flows vertically and freely downward by its own gravity, then flows to the traction rollers at the annealing furnace, then to the outlet of the annealing furnace, and finally enters the broken glass tank. Among them, during the downward process of the glass ribbon, it passes through the B1 area and B2 area of the shaping furnace, and then flows through the installation traction roller areas of the C1 area and C2 area of the annealing furnace, and finally passes through the C3-C9 areas of the annealing furnace to the outlet of the annealing furnace and enters the broken glass tank. If the temperature of the glass ribbon is not well controlled, the glass ribbon is prone to phenomena such as intermediate folding, bending, breaking, and winding into balls, thus forming blockage of materials.

[0005] Based on the above situation, the technical solution of the present invention is as follows:

[0006] A method for avoiding blockage of the glass plate during high-temperature flushing or high-temperature wetting of the muffle furnace overflow bricks. Cooling water pipes are inserted into the B2 area of the shaping furnace, so that the temperature of the B1 area of the shaping furnace is 1080 ± 20 °C, the temperature of the B2 area is 980 ± 20 °C, the temperature of the C1 area of the annealing furnace is 900 ± 20 °C, and the temperature of the C2 area is 800 ± 20 °C.

[0007] If the temperature of the above areas is too high, when the glass ribbon flows to equipment such as the annealing furnace, it is easy to wind around the traction rollers and adhere to other equipment, etc., forming blockage of materials; at the same time, due to the too high temperature, after the glass ribbon reaches the outlet of the annealing furnace, under the action of water, the glass ribbon is either not broken or is at the broken glass opening, and it is easy to hinder the flow, push the glass ribbon upward, and the upper glass ribbon is prone to folding, resulting in blockage of materials. When the temperature of the above areas is too low, the glass ribbon is prone to breakage in the annealing furnace area, and the middle of the glass ribbon is prone to fracture. Once the middle of the glass ribbon breaks, there is no stable downward gravity, and the glass is pulled downward and flows downward not smoothly and unstably. The glass ribbon will float in the shaping furnace and the annealing furnace. When encountering interference, the glass ribbon will fold, and the glass in the shaping furnace will adhere to the silicon carbide plate, and blockage of materials will form in the annealing furnace.

[0008] Preferably, the cooling water pipes span across the B2 area of the shaping furnace.

[0009] Preferably, the diameter of the cooling water pipes is 20-25 mm.

[0010] Preferably, during high-temperature flushing or high-temperature wetting, the traction rollers on both sides of the annealing furnace are supported, so that the distance between the two traction rollers is 10-15 mm, and the supporting height of the rocker arm outside the traction rollers is 15-25 mm.

[0011] The purpose of such operation is as follows: 1) If the gap between the traction rollers is too small or there is no gap, a clamping force will be formed on the glass belt. When the force is transmitted to the glass belt, since the temperature of the glass belt here is still very high, a clamping and holding force will be formed on the glass belt. This force will cause a force on the glass belt in the rotation direction of the traction rollers, making the glass belt wind around the traction rollers along the rotation direction of the traction rollers. Once it winds and is not processed in time, it will cause material blockage and serious consequences; 2) If the gap between the traction rollers is too large, the traction rollers will not play a traction role. When the gap is too large, the air flow turns up, resulting in instability when the glass belt flows downward, and it is easy to fold. The flow of the glass belt is disturbed, causing material blockage.

[0012] Preferably, the rotational speed of the traction rollers is 5000 - 8000 mm / min.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. During the high-temperature wetting or high-temperature flushing process of forming in the present invention, by inserting cooling water pipes in the B2 area of the shaping furnace, adjusting the temperatures of different areas of the shaping furnace and the annealing furnace, and adjusting the parameters of the traction rollers of the annealing furnace, it is possible to well avoid the phenomenon of material blockage caused by the rotation of the traction rollers at the annealing furnace winding the glass.

[0015] 2. The method of the present invention can solve the problem of material blockage caused by the traction rollers winding the glass, thus avoiding the occurrence of material blockage, enabling the high-temperature wetting or high-temperature flushing process to proceed normally and smoothly, achieving the purpose of counteracting defects through high-temperature flushing, enabling normal production, improving production efficiency, and creating economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the shaping furnace and the annealing furnace of the present invention.

[0017] In the figure, 1, muffle furnace; 2, shaping furnace; 201, B1 area; 202, B2 area; 3, cooling water pipe; 4, annealing furnace; 401, C1 area; 402, C2 area; 5, traction rollers. DETAILED DESCRIPTION OF THE INVENTION

[0018] In order to enable those skilled in the art of the present technology to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments of the present invention.

[0019] Such as Figure 1As shown in the figure, the present invention provides a method for avoiding blockage of glass plates during high-temperature flushing or high-temperature wetting of the muffle furnace overflow bricks. A cooling water pipe 3 with a diameter of 20-25 cm is inserted into the B2 area 202 of the shaping furnace 2. The cooling water pipe 3 spans across the B2 area 202 of the shaping furnace 2, so that the temperature of the B1 area 201 of the shaping furnace 2 is 1080±20°C, the temperature of the B2 area 202 is 980±20°C, the temperature of the C1 area 401 of the annealing furnace 4 is 900±20°C, and the temperature of the C2 area 402 is 800±20°C.

[0020] At the same time, during high-temperature flushing or high-temperature wetting, the traction rollers 5 on both sides of the annealing furnace 4 are supported, so that the distance between the two traction rollers 5 is 10-15 mm, the supporting height of the rocker outside the traction roller 5 is 15-25 mm, and the rotation speed of the traction roller 5 is 5000-8000 mm / min.

[0021] Example 1

[0022] When producing G6-generation liquid crystal glass substrates in this example, due to excessive crystallization at the confluence of the two ends of the overflow bricks and poor confluence state, the glass plate bait seriously affected normal production. Therefore, it was decided to perform high-temperature flushing on the overflow bricks of the muffle furnace 1. During high-temperature flushing, the conditions were set as follows: the temperature of area A of the muffle furnace 1 was about 1275°C, the temperature of the tip of the overflow brick was about 1235°C, the diameter of the cooling water pipe 3 inserted into the B2 area 202 of the shaping furnace 2 was 20 mm, the temperature of the B1 area 201 of the shaping furnace 2 was set at 1060°C, the temperature of the B2 area 202 was 960°C, the temperature of the C1 area 401 of the annealing furnace 4 was 880°C, and the temperature of the C2 area 402 was 780°C. At the same time, the traction rollers 5 on both sides of the annealing furnace 4 were supported, so that the distance between the two traction rollers 5 was 10 mm, the supporting height of the rocker outside the traction roller 5 was 15 mm, and the rotation speed of the traction roller 5 was 5000 mm / min.

[0023] After this high-temperature flushing was completed, during normal production of the formed guide plate, the effect was very good. The crystallization on the confluence plates at both ends of the overflow brick was basically washed away, the production was very stable, and the yield was significantly improved.

[0024] Comparative Example 1

[0025] When producing G6-generation liquid crystal glass substrates in Comparative Example 1, due to excessive crystallization at the confluence of the two ends of the overflow bricks and poor confluence condition, there were bubble bands in the bait, often causing plate breakage, which seriously affected normal production. Therefore, it was decided to perform high-temperature flushing on the overflow bricks of the muffle furnace 1. During high-temperature flushing, the temperature of area A of the muffle furnace 1 was about 1270°C, the temperature of the tip of the overflow brick was about 1230°C, the diameter of the cooling water pipe 3 inserted into the B2 area 202 of the shaping furnace 2 was 30 mm, the temperature of the B1 area 201 of the shaping furnace 2 was 1055°C, the temperature of the B2 area 202 was 955°C, the temperature of the C1 area 401 of the annealing furnace 4 was 855°C, and the temperature of the C2 area 402 was 775°C.

[0026] During this high-temperature rinsing process, the glass plates often broke in the annealing furnace 4, resulting in broken glass plates. Workers had to clean up the broken glass manually, and the high-temperature rinsing could not maintain continuity. After the rinsing was completed and the forming lead plate was produced, the crystallization of the bus bar decreased to some extent, but there was no obvious improvement. During the production process, not long after, the state before the high-temperature rinsing appeared again, and the high-temperature rinsing had to be carried out again. Analyzing the reasons, the temperature of the high-temperature rinsing did not reach the predetermined temperature. Coupled with frequent handling of broken plates and cleaning the broken glass through the window, the temperature in the furnace would drop, resulting in the inability to carry out continuous high-temperature rinsing.

[0027] Example 2

[0028] When producing G5 liquid crystal glass substrates in this example, due to the platinum needle defects in the glass plates that persisted for a long time without improvement, seriously affecting the quality and yield, the overflow bricks of the muffle furnace 1 were rinsed at high temperature. The rinsing set parameters were as follows: the diameter of the cooling water pipe 3 inserted into the 202 area of the B2 area of the shaping furnace 2 was 25 mm, the temperature of the 201 area of the B1 area of the shaping furnace 2 was 1100 °C, the temperature of the 202 area of the B2 area of the shaping furnace 2 was 1000 °C, the temperature of the 401 area of the C1 area of the annealing furnace 4 was 920 °C, and the temperature of the 402 area of the C2 area of the annealing furnace 4 was 820 °C. At the same time, the traction rollers 5 on both the left and right sides of the annealing furnace 4 were supported, the distance between the two traction rollers 5 was 15 mm, the support height of the rocker outside the traction roller 5 was 25 mm, and the rotation speed of the traction roller 5 was 8000 mm / min.

[0029] After this high-temperature rinsing and the normal production of the forming lead plate, the platinum needle defects in the glass plates basically disappeared, and the yield was greatly improved.

[0030] Comparative Example 2

[0031] When producing G5 liquid crystal glass substrates in Comparative Example 2, due to the platinum needle defects in the glass plates, the overflow bricks were rinsed at high temperature. The set parameters were as follows: the diameter of the cooling water pipe 3 inserted into the 202 area of the B2 area of the shaping furnace 2 was 18 mm, the temperature of the 201 area of the B1 area of the shaping furnace 2 was 1105 °C, the temperature of the 202 area of the B2 area of the shaping furnace 2 was 1005 °C, the temperature of the 401 area of the C1 area of the annealing furnace 4 was 930 °C, and the temperature of the 402 area of the C2 area of the annealing furnace 4 was 830 °C. The traction roller 5 in the 402 area of the C2 area of the annealing furnace 4 was not supported and clamped the glass.

[0032] During this high-temperature flushing process, a serious material blockage accident occurred. Due to the excessively high temperature of the glass ribbon, at the 402 traction roller 5 in the 4C2 area of the annealing furnace 4, the glass ribbon wound around the traction roller 5, and the glass ribbon accumulated and blocked the annealing furnace 4. Coupled with the untimely handling by personnel, the glass piled up more and more. The 4C1 area 401 of the annealing furnace 4 and the 2B area of the shaping furnace were all filled with glass, and the situation was very dangerous. The kiln was ordered to stop feeding, and the platinum channel discharged materials from the stirring tank and no longer fed materials to the forming section. Then the forming section was cooled down, and the glass in the shaping furnace 2 and the annealing furnace 4 was processed. It took nearly a shift to clean up the broken glass, and then it was reheated and the high-temperature flushing operation was continued. This high-temperature flushing process was very dangerous.

[0033] Example 3

[0034] In this example, G8.5 generation liquid crystal substrates are produced. During the high-temperature wetting overflow brick process, the set parameters are as follows: the diameter of the cooling water pipe 3 inserted in the 202 area of the 2B2 area of the shaping furnace 2 is 22 mm, the temperature of the 201 area of the B1 area of the shaping furnace 2 is 1080 °C, the temperature of the 202 area of the B2 area of the shaping furnace 2 is 1000 °C, the temperature of the 401 area of the C1 area of the annealing furnace 4 is 900 °C, and the temperature of the 402 area of the C2 area of the annealing furnace 4 is 800 °C. At the same time, the traction rollers 5 on both the left and right sides of the annealing furnace 4 are supported, the distance between the two traction rollers 5 is 13 mm, the support height of the rocker outside the traction roller 5 is 20 mm, and the rotation speed of the traction roller 5 is 6500 mm / min.

[0035] After this high-temperature wetting overflow brick is completed, the forming lead plate is produced normally, and it is found that the forming quality is very stable, no other quality defects occur, and the yield rate is quickly improved.

[0036] Comparative Example 3

[0037] In Comparative Example 3, G8.5 generation liquid crystal substrates are produced. The difference from Example 3 during the high-temperature wetting overflow brick process is that the diameter of the cooling water pipe 3 inserted in the 202 area of the 2B2 area of the shaping furnace 2 is 27 mm, the temperature of the 201 area of the B1 area of the shaping furnace 2 is 1050 °C, the temperature of the 202 area of the B2 area of the shaping furnace 2 is 950 °C, the temperature of the 401 area of the C1 area of the annealing furnace 4 is 850 °C, and the temperature of the 402 area of the C2 area of the annealing furnace 4 is 760 °C.

[0038] After this wetting is completed, after the forming lead plate is produced, it is found that there are several bright and dark stripes on the surface of the glass plate. These bright and dark stripes seriously affect the quality of the glass plate. Some are within the specifications, and one bright and dark stripe cannot be judged as good. Then it took a long time to take forming countermeasures before it was judged as good.

[0039] As can be seen from the above embodiments, whether it is high-temperature flushing or high-temperature wetting operation of the overflow bricks, the parameters are set as follows: insert a cooling water pipe 3 with a diameter of Ф20-25mm into the B2 area 202 of the shaping furnace 2, so that the temperature of the B1 area 201 of the shaping furnace 2 is 1080±20°C, the temperature of the B2 area 202 is 980±20°C, the temperature of the C1 area 401 of the annealing furnace 4 is 900±20°C, and the temperature of the C2 area 402 is 800±20°C; for the traction rollers 5, it is set that the distance between the two traction rollers 5 is 10-15mm, and the height of the rocker arm support outside the traction rollers 5 is 15-25mm; the rotation speed of the traction rollers 5 is 5000-8000mm / min. By setting the above parameters, the flushing effect of the overflow bricks can be achieved, without causing blockage in the annealing furnace 4, nor will there be any defects that affect the quality of the glass plate. From the above comparative examples, it can be seen that if the parameters exceed the above range, many problems will occur. Seriously, there will be blockage, the flushing will not achieve the effect, and it has to be flushed again. Moreover, new defects that affect the quality of the glass plate will appear, which seriously affects normal production and the improvement of the yield rate of the glass plate.

Claims

1. A method for preventing glass plate blocking during high-temperature washing or high-temperature wetting of muffle furnace overflow bricks, characterized in that: The shaping furnace (2) is divided into a B1 zone (201) and a B2 zone (202) from top to bottom in the vertical direction. The annealing furnace (4) is located below the shaping furnace (2) and is divided into a C1 zone (401) and a C2 zone (402) from top to bottom in the vertical direction. A cooling water pipe (3) is inserted into the B2 zone (202) of the shaping furnace (2), so that the temperature of the B1 zone (201) of the shaping furnace (2) is 1080±20°C, the temperature of the B2 zone (202) is 980±20°C, the temperature of the C1 zone (401) of the annealing furnace (4) is 900±20°C, and the temperature of the C2 zone (402) is 800±20°C.

2. The method for preventing glass plate blocking during high temperature washing or high temperature wetting of muffle furnace overflow bricks according to claim 1, characterized in that: The cooling water pipe (3) spans across the B2 zone (202) of the shaping furnace (2).

3. The method for avoiding glass plate blocking during high temperature washing or high temperature wetting of muffle furnace overflow bricks according to claim 1, characterized in that: The diameter of the cooling water pipe (3) is 20-25 mm.

4. The method for preventing glass plate blocking during high temperature washing or high temperature wetting of muffle furnace overflow bricks according to claim 1, characterized in that: During high-temperature flushing or high-temperature wetting, the traction rollers (5) on the left and right sides of the annealing furnace (4) are supported so that the distance between the two traction rollers (5) is 10-15 mm.

5. The method for preventing glass plate blocking during high temperature washing or high temperature wetting of muffle furnace overflow bricks according to claim 4, characterized in that: The rotation speed of the traction roller (5) is 5000-8000 mm / min.

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