Ultrathin electronic glass slag box pressure control device and use method

Abstract

The invention discloses an ultrathin electronic glass slag box pressure control device and a using method, the ultrathin electronic glass slag box pressure control device comprises a nitrogen pipeline connected with a slag box, the output end of the nitrogen pipeline is sequentially connected with a U-shaped heating pipe and an output pipe, the output pipe is connected with a branch pipe in parallel, and the branch pipe extends to a lower cavity of the slag box through a cylindrical exhaust head; the nitrogen pipeline is provided with an electric butterfly valve, the input end of the heating pipe is provided with a flowmeter, the lower cavity of the slag box is provided with a pressure tapping pipe and a pressure gauge, and the output pipe and the branch pipe are wrapped by composite insulating layers. Through cooperative control of the electric butterfly valve, the flowmeter and the pressure gauge, the micro-positive pressure of the lower cavity of the slag box is maintained so as to block external invasion, nitrogen is heated and heat preservation is performed by means of tin bath waste heat, the process consistency is guaranteed, the quality of the lower surface of glass is remarkably improved, the requirements of TP grade judgment and the like are met, and the device is suitable for ultrathin electronic glass production scenes.

Description

Technical Field

[0001] This invention relates to the field of slag box pressure control technology, and in particular to an ultra-thin electronic glass slag box pressure control device and its usage method. Background Technology

[0002] The ultra-thin electronic glass traditional slag box has no slag box bottom negative pressure control device. The upper space controls the airflow through the curtain. The upper space is blocked by the glass plate. The tin bath exhaust gas passes directly through, which is a positive pressure system. The lower space only controls the airflow by installing graphite strips or silicon wire bricks in the U-shaped groove. There is no effective negative pressure monitoring and precise control measures for the lower price control pressure.

[0003] The lower part of the annealing furnace is under negative pressure, allowing external oxygen and water molecules to enter the lower space of the slag box through poor sealing. The H2 combustion in the slag box produces water molecules that react with Sn and SnO on the transition roller surface, contaminating the roller surface and causing the quality issues shown in the table below. Simultaneously, SO2 in the slag box is oxidized to produce SO3. SO3, SO2, and O2 escape through the outlet end into the tin bath, contaminating the molten tin and further exacerbating the contamination at the outlet end. Summary of the Invention

[0004] The technical problem to be solved by this invention is that the traditional slag box for ultra-thin electronic glass lacks a negative pressure control and monitoring device at the bottom and has poor airflow blocking effect, which leads to the intrusion of external oxygen and water molecules, causing roller surface contamination, SO2 oxidation to generate SO3 contamination of molten tin, and thus causing quality defects on the lower surface of the glass.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an ultra-thin electronic glass slag box pressure control device, including a nitrogen pipeline connected to the slag box, the output end of the nitrogen pipeline being connected in sequence to a heating pipe and an output pipe, the output pipe being connected to a branch pipe, and the output end of the branch pipe being arranged in the lower cavity of the slag box below the glass strip inside the slag box.

[0006] Preferably, the lower cavity of the slag box is continuously distributed within the slag box, and the branch pipe is connected in parallel to the output pipe.

[0007] Preferably, the outer walls of the output pipe and the branch pipe are wrapped with a composite insulation layer of insulation cotton and silicone cloth.

[0008] Preferably, a slag box pressure tapping pipe is connected to the lower cavity of the slag box, a slag box pressure gauge is connected to the slag box pressure tapping pipe, and a flow meter is connected to the input end of the heating pipe.

[0009] Preferably, an electric butterfly valve is connected to the nitrogen pipeline, and the flow meter signal is connected to the control unit of the electric butterfly valve.

[0010] Preferably, the heating tube is U-shaped and fixed to the tin bath sealing edge inside the slag box, with the top of the heating tube closely attached to the tin bath breast wall brick at the top of the tin bath sealing edge.

[0011] Preferably, the output end of the branch pipe is connected to an exhaust head, which is cylindrical and has exhaust holes evenly distributed on its outer side wall.

[0012] A method for using a pressure control device for an ultra-thin electronic glass slag box includes the following steps: Step 1: Open the electric butterfly valve. External nitrogen gas enters the heating tube after being metered by the flow meter, and the nitrogen gas in the heating tube is heated by the tin bath wall bricks. Step 2: The heated nitrogen gas is distributed to each branch pipe through the output pipe and then transported to the corresponding slag box lower cavity through the branch pipe; Step 3: Monitor the pressure value in the lower cavity of the slag box in real time through the pressure tapping pipe and pressure gauge of the slag box. Adjust the opening of the electric butterfly valve according to the pressure feedback value and the flow meter to control the flow rate of nitrogen and maintain the lower cavity of the slag box in a slightly positive pressure state.

[0013] Preferably, in step one, the temperature of the nitrogen gas after being heated by the heating tube is matched with the temperature at the outlet of the tin bath.

[0014] Preferably, in step one, a high-temperature resistant and high-heat-resistant gasket is attached between the branch pipe and the tin bath breast wall brick.

[0015] This invention provides a pressure control device and method for using an ultra-thin electronic glass slag box, which has the following beneficial effects.

[0016] 1. Through the coordinated operation of electric butterfly valve, flow meter and real-time digital display pressure gauge, the lower cavity of the slag box can be precisely maintained in a slightly positive pressure state, effectively blocking external oxygen and water molecules from entering from the shaft head seal, poorly sealed areas and the open area between rollers 3 and 4 of the slag box; at the same time, it inhibits the H2 combustion water production reaction in the slag box exhaust gas, avoids defects such as tin imprint and scratches on the lower surface caused by the reaction of water molecules with Sn and SnO on the transition roller surface, reduces SO2 oxidation to SO3, and prevents SO3 from escaping into the tin bath with O2 and SO2 to contaminate the tin liquid, significantly improves the tin adhesion problem on the lower surface of the glass, improves the product grade, and reduces the tin imprint grade on the lower surface of the glass to sporadic point / cluster A / B grade, meeting the TP grade judgment requirements.

[0017] 2. U-shaped heating pipes are arranged close to the brickwork of the tin bath breast wall, using the residual heat of the tin bath to heat pure nitrogen. The output pipes and branch pipes are wrapped with a composite insulation layer of insulation cotton and silica cloth, and high-temperature resistant thermally conductive pads are used to improve heat transfer efficiency. This allows the nitrogen temperature to match the temperature at the tin bath outlet, preventing the introduction of low-temperature nitrogen from disrupting the temperature field of the lower cavity of the slag box and ensuring the consistency of the glass production process. At the same time, the cylindrical exhaust head and evenly distributed exhaust holes at the output end of the branch pipes can evenly diffuse the heated nitrogen into the lower cavity of the slag box, avoiding local airflow turbulence and further improving the stability of pressure control. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0019] In the diagram: 1. Tin bath breast wall bricks; 2. Tin bath side seal; 3. Electric butterfly valve; 4. Flow meter; 5. Heating tube; 6. Output tube; 7. Glass belt; 8. Transition roller; 9. Lower cavity of slag box; 10. Branch pipe; 11. Slag box pressure tapping pipe; 12. Slag box pressure gauge; 13. Slag box. Detailed Implementation

[0020] like Figure 1 As shown, the present invention provides a pressure control device for an ultra-thin electronic glass slag box, including a nitrogen pipeline connected to the slag box 5. The output end of the nitrogen pipeline is connected in sequence to a heating pipe 5 and an output pipe 6. The output pipe 6 is connected to a branch pipe 10. The output end of the branch pipe 10 is arranged in the lower cavity 9 of the slag box 13 below the glass strip 7.

[0021] First, nitrogen is supplied to the heating tube 5 through the nitrogen pipeline. When the nitrogen passes through the heating tube 5, it is heated to a temperature that matches the temperature at the outlet of the tin bath in the slag box 5. Then, the nitrogen enters the output pipe 6, passes through the branch pipe 10, and is supplied to the lower cavity 9 of the slag box as a protective gas for the lower cavity 9 of the slag box.

[0022] like Figure 1 As shown. The lower chambers 9 of the slag box are continuously distributed within the slag box 13, and the branch pipe 10 is connected to the output pipe 6. Nitrogen is supplied to each lower chamber 9 of the slag box through one output pipe 6 in conjunction with the branch pipe 10.

[0023] In a preferred embodiment of the present invention, to avoid the nitrogen temperature dropping during the nitrogen transport process and becoming incompatible with the temperature at the tin bath outlet in the slag box 5, the outer walls of the output pipe 6 and the branch pipe 10 are wrapped with a composite insulation layer of insulation cotton and silica cloth.

[0024] like Figure 1 As shown, the internal air pressure of the lower cavity 9 of the slag box is detected by the slag box pressure tapping pipe 11 in conjunction with the slag box pressure gauge 12, and the nitrogen supply is adjusted according to the pressure. The lower cavity 9 of the slag box is connected to the slag box pressure tapping pipe 11, and the slag box pressure gauge 12 is connected to the slag box pressure tapping pipe 11. The input end of the heating pipe 5 is connected to the flow meter 4.

[0025] like Figure 1 As shown, the opening of the electric butterfly valve 3 is adjusted according to the detected internal air pressure of the lower cavity 9 of the slag box to maintain the stable operating condition of the slag box 5. The electric butterfly valve 3 is connected to the nitrogen pipeline, and the flow meter 4 is connected to the control unit of the electric butterfly valve 3.

[0026] like Figure 1 As shown. The heating tube 5 is U-shaped and fixed to the tin bath sealing edge 2 inside the slag box 13. The top of the heating tube 5 is arranged close to the tin bath breast wall brick 1 at the top of the tin bath sealing edge 2. The nitrogen gas inside the heating tube 5 is heated by the tin bath breast wall brick 1, so that the nitrogen gas temperature is matched with the internal temperature of the lower cavity 9 of the slag box.

[0027] In a preferred embodiment of the present invention, to avoid turbulent airflow inside the lower cavity 9 of the slag box during nitrogen output, the gas is made to flow out uniformly. The output end of the branch pipe 10 is connected to an exhaust head, which is cylindrical and has exhaust holes evenly arranged on its outer side wall.

[0028] A method for using a pressure control device for an ultra-thin electronic glass slag box includes the following steps: Step 1: Open the electric butterfly valve 3. External nitrogen gas enters the heating tube 5 after being measured by the flow meter 4. The nitrogen gas in the heating tube 5 is heated by the tin bath wall bricks 1. Step 2: The heated nitrogen gas is distributed through the output pipe 6 to each branch pipe 10, and then transported through the branch pipe 10 to the corresponding slag box lower cavity 9. Step 3: Monitor the pressure value in the lower cavity 9 of the slag box in real time through the pressure tapping pipe 11 and the pressure gauge 12 of the slag box. Adjust the opening of the electric butterfly valve 3 according to the pressure feedback value and the flow meter 4 to control the flow rate of nitrogen gas and maintain the lower cavity 9 of the slag box in a slightly positive pressure state.

[0029] In a preferred embodiment of the present invention, to improve the connection stability between the branch pipe 10 and the tin bath chest wall brick 1 and achieve efficient heat conduction, a high-temperature resistant and high-heat-resistant gasket is attached between the branch pipe 10 and the tin bath chest wall brick 1 in step one.

[0030] Before using this device, the lower surface of the glass plate had banded and striped C / D grade tin marks. After using this device, the tin mark grade was reduced to sporadic dotted / clumped A / B grade, and the quality of the lower surface was significantly improved.

[0031] As can be seen from the quality of the 0.33mm product in the table above after 5 cycles, the quality of the product in the table has been greatly improved after the use of this device. The glass plate grade has been improved from failing to meet the TP grade on three sides to meeting the TP grade on three sides.

[0032] Case 2: Before using this device, the solder adhesion on the lower surface increased rapidly, edge cleaning was frequent, and the amount of solder penetration was high. After using this device, the solder adhesion on the lower surface increased slowly, edge cleaning was significantly reduced, and the amount of solder penetration decreased.

[0033] After using this device, the tin adhesion under the glass plate is effectively improved, and the contamination of the tin bath is effectively controlled.

Claims

1. A pressure control device for an ultra-thin electronic glass slag box, characterized in that: The nitrogen pipeline is connected to the slag box (5). The output end of the nitrogen pipeline is connected to the heating pipe (5) and the output pipe (6) in sequence. The output pipe (6) is connected to the branch pipe (10). The output end of the branch pipe (10) is arranged in the lower cavity (9) of the slag box (13) below the glass strip (7).

2. The pressure control device for an ultra-thin electronic glass slag box according to claim 1, characterized in that: The lower cavity (9) of the slag box is continuously distributed in the slag box (13), and the branch pipe (10) is connected to the output pipe (6).

3. The pressure control device for an ultra-thin electronic glass slag box according to claim 2, characterized in that: The outer walls of the output pipe (6) and the branch pipe (10) are both wrapped with a composite insulation layer of insulation cotton and silicone cloth.

4. The pressure control device for an ultra-thin electronic glass slag box according to claim 1, characterized in that: The lower cavity (9) of the slag box is connected to a slag box pressure tapping pipe (11), and a slag box pressure gauge (12) is connected to the slag box pressure tapping pipe (11). The input end of the heating pipe (5) is connected to a flow meter (4).

5. The pressure control device for an ultra-thin electronic glass slag box according to claim 4, characterized in that: An electric butterfly valve (3) is connected to the nitrogen pipeline, and the flow meter (4) is connected to the control unit of the electric butterfly valve (3).

6. The pressure control device for an ultra-thin electronic glass slag box according to claim 1, characterized in that: The heating tube (5) is U-shaped and is fixed to the tin bath sealing edge (2) inside the slag box (13). The top of the heating tube (5) is arranged close to the tin bath breast wall brick (1) at the top of the tin bath sealing edge (2).

7. The pressure control device for an ultra-thin electronic glass slag box according to claim 1, characterized in that: The output end of the branch pipe (10) is connected to an exhaust head, which is cylindrical and has exhaust holes evenly arranged on its outer side wall.

8. The method of using the pressure control device for an ultra-thin electronic glass slag box as described in any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Open the electric butterfly valve (3). After being metered by the flow meter (4), the external nitrogen gas enters the heating tube (5) and is heated by the tin bath wall bricks (1). Step 2: The heated nitrogen gas is distributed through the output pipe (6) to each branch pipe (10), and then transported through the branch pipe (10) to the corresponding slag box lower cavity (9); Step 3: Monitor the pressure value in the lower cavity (9) of the slag box in real time through the pressure tapping pipe (11) and the pressure gauge (12). Adjust the opening of the electric butterfly valve (3) according to the pressure feedback value and the flow meter (4) to control the flow rate of nitrogen gas and maintain the lower cavity (9) of the slag box in a slightly positive pressure state.

9. The method of using the pressure control device for an ultra-thin electronic glass slag box according to claim 8, characterized in that: In step one, the temperature of nitrogen gas after being heated by the heating tube (5) is matched with the temperature at the outlet of the tin bath.

10. The method of using the pressure control device for an ultra-thin electronic glass slag box according to claim 8, characterized in that: In step one, a high-temperature resistant and high-heat resistant gasket is attached between the branch pipe (10) and the tin bath breast wall brick (1).

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