Edge water control methods when resizing MiniLED backplate glass

Abstract

The application discloses a method for controlling edge water when a Mini LED backplane glass is changed in specification, 1) when the thickness of the glass plate is adjusted, three edge waters are moved, the three edge waters are connected, the third edge water felt edge part exceeds the edge of the glass plate, and the water flow of the third edge water is adjusted; 2) when the width of the glass plate is adjusted to be wider, the positions of the three edge waters are adjusted, the felt edge part of the third edge water exceeds the edge of the glass plate, the water marks of the felt of the three edge waters on the glass plate are connected along the width direction of the glass plate, and the water flow of the three edge waters is increased; 3) when the width of the glass plate is adjusted to be narrower, the positions of the three edge waters are adjusted, the felt edge part of the third edge water is located at the edge of the glass plate, the water marks of the felt of the three edge waters on the glass plate are connected but not overlapped along the width direction of the glass plate, and the water flow of the three edge waters is decreased. According to the application, different edge water parameters are adjusted according to different plate changing conditions, so that the production loss caused by the change in the specification of the glass is reduced.

Description

Technical Field

[0001] This invention relates to the field of glass production technology, specifically to a method for controlling edge water when modifying the specifications of Mini LED backplate glass. Background Technology

[0002] In the production process of Mini LED backplane glass, the production specifications of the glass need to be adjusted to meet the different size requirements of various customers. When adjusting the cold end specifications, it is necessary to monitor the glass operation in real time to avoid glass loss due to fluctuations during the modification, and to change the parameters of the cross and slitting machines at the appropriate time to complete the modification operation.

[0003] The specification modification process in glass production begins in the tin bath. Tin bath operators adjust the edge-pulling machine and main drive parameters according to the target specifications. Subsequently, annealing furnace operators adjust the annealing parameters. Once the adjusted glass strip reaches the cold end, cold end operators change the cutting parameters and adjust the cutting conditions to obtain the desired glass specifications. The glass strips adjusted in the tin bath are narrow and have complex thickness variations, accompanied by rapid changes in the main drive speed. Simultaneously, operators must adjust cutting parameters, communicate with stacking and gripping processes, continuously measure glass sheet thickness, and adjust for cutting defects. After specification modification, timely measurement of glass sheet dimensions is crucial to minimize glass loss. This process requires frequent communication with each section, making it impossible to continuously monitor the cold end glass cutting status. Therefore, it is necessary to adjust the edge temperature of the glass sheet specifically according to different specification adjustments to reduce production losses caused by glass specification modification. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method for controlling edge water when modifying the specifications of Mini LED backplate glass. For the cutting section in the glass forming process, different edge water parameters are adjusted according to different modification situations to reduce the production losses caused by the modification of glass specifications.

[0005] The technical solution of this invention is as follows:

[0006] When modifying the specifications of Mini LED backplate glass, the edge water control method is as follows: between the outlet of the annealing furnace and the longitudinal cutting knife, three edge water channels are symmetrically set on both sides of the glass plate. These three edge water channels are the first edge water channel, the second edge water channel, and the third edge water channel in sequence along the moving direction of the glass plate.

[0007] 1) When adjusting the thickness of the glass plate

[0008] Calculate the time it takes for the glass plate with adjusted thickness to reach the cold end. When it reaches the cold end, move the three side water channels so that they connect and the felt edge of the third side water channel extends beyond the edge of the glass plate. Adjust the water flow rate of the third side water channel. When the thickness of the glass plate decreases, the water flow rate of the third side water channel needs to be reduced, and vice versa when the thickness increases.

[0009] 2) When adjusting the width of the glass plate to increase

[0010] Calculate the time it takes for the glass plate to reach the cold end after the width adjustment. When it reaches the cold end, adjust the position of the three side water channels so that the edge of the felt of the third side water channel extends beyond the edge of the glass plate, and the water marks of the felt of the three side water channels on the glass plate are connected along the width direction of the glass plate; at the same time, increase the water flow rate of the three side water channels.

[0011] 3) When adjusting the width of the glass plate to become narrower

[0012] Calculate the time it takes for the glass plate to reach the cold end after the width adjustment. When it reaches the cold end, adjust the position of the three edge water channels so that the edge of the felt of the third edge water channel is located at the edge of the glass plate, and the water marks of the felt of the three edge water channels on the glass plate are connected along the width direction of the glass plate but do not overlap; at the same time, reduce the water flow rate of the three edge water channels.

[0013] Preferably, in steps 1), 2), and 3), the calculation formula for the time for the glass plate to reach the cold end is as follows: Time to reach the cold end (min) = 60 × 2 × Distance from the end of the tin bath to the first roller of the cold end (m) ÷ [Main drive speed before adjustment (m / h) + Main drive speed after adjustment (m / h)] - 3 (min).

[0014] Preferably, in step 1), when it reaches the cold end, the third edge water is moved so that the edge of the felt extends 10-15mm beyond the edge of the glass plate.

[0015] Preferably, in step 1), the adjustment amount of the water flow rate of the third side water (mL / min) = the original water flow rate (mL / min) × [the main drive speed before adjustment (m / h) ÷ the main drive speed after adjustment (m / h) - 1] × 0.5.

[0016] Preferably, in step 2), when it reaches the cold end, the position of the three edge water channels is adjusted so that the felt edge of the third edge water channel extends 20-30mm beyond the edge of the glass plate.

[0017] Preferably, in steps 2) and 3), the water flow rate adjustment for the three side water channels is as follows:

[0018] First side water flow rate adjustment (mL / min) = Original water flow rate (mL / min) × First side water movement amount (mm) ÷ 105;

[0019] Second side water flow rate adjustment (mL / min) = Original water flow rate (mL / min) × Second side water movement amount (mm) ÷ 100;

[0020] The adjustment amount of the third side water flow (mL / min) = the original water flow (mL / min) × the movement amount of the third side water (mm) ÷ 100.

[0021] Preferably, in steps 2) and 3), after the glass plate width is adjusted to be qualified, the positions of the three edge water channels are adjusted so that the inner side of the felt of the first edge water channel is located 75mm outside the extension line of the knife path, the inner side of the felt of the second edge water channel is located 110mm outside the extension line of the knife path, and the outer side of the felt of the third edge water channel coincides with the edge of the glass plate; and the water flow rate of the three edge water channels is adjusted to the original water flow rate.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] This invention targets the cutting section in the glass forming process, adjusting different edge water parameters according to different plate modification situations, effectively controlling the impact of glass specification modification on glass cutting, and reducing production losses caused by glass specification modification. Attached Figure Description

[0024] Figure 1 This is a schematic diagram showing the positions of the three side water features of the present invention.

[0025] In the diagram, 1. First edge water; 2. Second edge water; 3. Third edge water; 4. Edge of glass plate; 5. Support; 6. Water pipe; 7. Felt. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of this invention will be clearly and completely described below in conjunction with the embodiments of this invention.

[0027] After the Mini LED back panel glass is annealed in an annealing furnace, it needs to be longitudinally cut. Before this, such as Figure 1As shown, three symmetrical cooling water channels are installed on both sides of the glass plate between the outlet of the annealing furnace and the slitting knife. The spacing between adjacent cooling water channels is 5m. For ease of explanation, the three cooling water channels are named sequentially as the first cooling water channel 1, the second cooling water channel 2, and the third cooling water channel 3 along the direction of glass plate movement. The cooling water channel is a commonly used device in the production of Mini LED backplane glass. Its structure is as follows: three supports 5 are installed on both sides of the glass plate edge 4. Each support 5 is equipped with a water pipe 6. The outlet of the water pipe 6 is 8cm away from the upper surface of the glass plate. The water pipe 6 is equipped with a flow meter and a valve for monitoring and adjusting the water flow rate of the cooling water. A 5cm wide felt 7 is installed at the outlet of the water pipe 6. The felt 7 is placed on the glass plate edge 4 to evenly coat the water on the glass plate edge 4.

[0028] Example 1

[0029] When producing Mini LED backplane glass, if the glass thickness needs to be adjusted, since it doesn't involve modifying the glass cutting dimensions, there's no need to adjust the dimensional parameters. Only the cutting progress and glass thickness need to be monitored. When the solder bath specifications are changed, the cold-end cutting section is notified. Cold-end personnel calculate the time it takes for the adjusted glass to reach the cold end using the following formula:

[0030] Time to reach the cold end (min) = 60 × 2 × Distance from the end of the tin bath to the cold end roller 1 (m) ÷ [Main drive speed before adjustment (m / h) + Main drive speed after adjustment (m / h)] - 3 (min).

[0031] In this embodiment, the distance from the end of the tin bath to the edge-pulling machine to the No. 1 roller conveyor at the cold end is 120m. The main drive speed before adjustment is 300m / h, and the main drive speed after adjustment is 450m / h. Therefore, in this embodiment, the time for the glass plate after thickness adjustment to reach the cold end is 16.2min.

[0032] When the glass plate with adjusted thickness reaches the cold end, the cold end personnel will adjust the edge water flow appropriately so that the three edge water flows meet and the edge of the felt 7 of the third edge water flow 3 extends 10-15mm beyond the edge of the glass plate. This facilitates operation and minimizes other impacts. The water flow rate of the third edge water flow 3 will be adjusted to minimize cutting losses. The adjustment amount of the water flow rate of the third edge water flow 3 is calculated using the following formula:

[0033] The adjustment amount of the water flow rate of the third side water 3 (mL / min) = the original water flow rate (mL / min) × [the main drive speed before adjustment (m / h) ÷ the main drive speed after adjustment (m / h) - 1] × 0.5.

[0034] In this embodiment, the original water flow rate is 1 mL / min, the main drive speed before adjustment is 300 m / h, and the main drive speed after adjustment is 450 m / h. Therefore, in this embodiment, the water flow rate adjustment of the third side water 3 is 1.25 mL / min.

[0035] Once the adjusted glass plate reaches the cold end, the tracking personnel should promptly measure the thickness at various points on the glass plate. If the thickness is not up to standard, the plate should be dropped. During the dropping process, the cutting personnel do not need to make fine adjustments to the cutting. Fine adjustments can be made when the thickness approaches the target thickness. When the glass plate reaches the target thickness and the main drive is in position, the cutting personnel can go to measure and confirm the dimensions.

[0036] When only the length of the plate is changed, only the cross-cutting parameters need to be adjusted; there is no need to adjust the edge water level. However, when the width of the plate is changed, unlike ordinary float glass which can maintain a relatively stable thickness, the thickness of the Mini LED backplate glass is difficult to maintain during the width change process. Therefore, the thickness will change along with the width change.

[0037] Example 2

[0038] When the glass plate width needs to be adjusted, the cold-end cutting section is notified, and the cold-end personnel calculate the time it will take for the glass plate with the adjusted width to reach the cold end using the following formula:

[0039] Time to reach the cold end (min) = 60 × 2 × Distance from the end of the tin bath to the cold end roller 1 (m) ÷ [Main drive speed before adjustment (m / h) + Main drive speed after adjustment (m / h)] - 3 (min).

[0040] In this embodiment, the distance from the end of the tin bath to the edge-pulling machine to the No. 1 roller conveyor at the cold end is 120m. The main drive speed before adjustment is 450m / h, and the main drive speed after adjustment is 300m / h. Therefore, in this embodiment, the time for the glass plate after width adjustment to reach the cold end is 16.2min.

[0041] Before the glass plate, after its width adjustment, reaches the cold end, the cutting personnel are responsible for modifying the cutting parameters of the spare blade to the target parameters. When the glass plate, after its width adjustment, reaches the cold end, the cold end personnel will appropriately move the edge water jets so that the edge of the felt 7 of the third edge water jet 3 extends 20-30mm beyond the edge of the glass plate, and the watermarks of the felt 7 of the three edge water jets on the glass plate meet along the width direction of the glass plate; at the same time, the water flow rate of the three edge water jets will be increased, and the water flow rate adjustment amount will be calculated according to the following formula:

[0042] The adjustment amount of the first side water flow (mL / min) = the original water flow (mL / min) × the movement amount of the first side water flow (mm) ÷ 105;

[0043] The adjustment amount of the flow rate of the second side water 2 (mL / min) = the original water flow rate (mL / min) × the movement amount of the second side water 2 (mm) ÷ 100;

[0044] The adjustment amount of the flow rate of the third side water 3 (mL / min) = the original water flow rate (mL / min) × the movement amount of the third side water 3 (mm) ÷ 100.

[0045] In this embodiment, the raw water flow rate is 1 mL / min, the movement of the first side water 1 is 50 mm, the movement of the second side water 2 is 40 mm, and the movement of the third side water 3 is 35 mm. Therefore, in this embodiment, the water flow rate adjustment of the first side water 1 is 0.47 mL / min, the water flow rate adjustment of the second side water 2 is 0.4 mL / min, and the water flow rate adjustment of the third side water 3 is 0.35 mL / min.

[0046] Once the adjusted glass plate reaches the cold end, the tracking personnel should promptly measure the thickness of the glass plate at various points. If the thickness is not up to standard, the plate should be dropped. During the dropping process, the cutting personnel do not need to make fine adjustments to the cutting; fine adjustments can be made when the thickness approaches the target thickness.

[0047] When the glass plate reaches the target thickness and width, the cold-end cutting operator moves the three edge water jets outwards sequentially, adjusts the water flow rate of each jet to the original flow rate, lowers the spare blade, changes the cutting dimensions, and quickly measures the actual dimensions of the glass plate. During adjustment, the inner side of the felt 7 of the first edge water jet 1 is located 75mm outside the extended blade path, the inner side of the felt 7 of the second edge water jet 2 is located 110mm outside the extended blade path, and the outer side of the felt 7 of the third edge water jet 3 coincides with the edge of the glass plate.

[0048] Example 3

[0049] When the glass plate width needs to be adjusted to be narrower, the cold end cutting section is notified, and the cold end personnel calculate the time it will take for the glass plate with the adjusted width to reach the cold end using the following formula:

[0050] Time to reach the cold end (min) = 60 × 2 × Distance from the end of the tin bath to the cold end roller 1 (m) ÷ [Main drive speed before adjustment (m / h) + Main drive speed after adjustment (m / h)] - 3 (min).

[0051] In this embodiment, the distance from the end of the tin bath to the edge-pulling machine to the No. 1 roller conveyor at the cold end is 120m. The main drive speed before adjustment is 300m / h, and the main drive speed after adjustment is 450m / h. Therefore, in this embodiment, the time for the glass plate after width adjustment to reach the cold end is 16.2min.

[0052] Before the glass plate, after its width adjustment, reaches the cold end, the cutting personnel are responsible for modifying the cutting parameters of the spare blade to the target parameters. When the glass plate, after its width adjustment, reaches the cold end, the cold end personnel will appropriately move the edge water jets so that the edge of the felt 7 of the third edge water jet 3 is located at the edge of the glass plate, and the watermarks of the felt 7 of the three edge water jets on the glass plate are connected along the width direction of the glass plate but do not overlap; at the same time, the water flow rate of the three edge water jets will be reduced, and the water flow rate adjustment amount will be calculated according to the following formula:

[0053] The adjustment amount of the first side water flow (mL / min) = the original water flow (mL / min) × the movement amount of the first side water flow (mm) ÷ 105;

[0054] The adjustment amount of the flow rate of the second side water 2 (mL / min) = the original water flow rate (mL / min) × the movement amount of the second side water 2 (mm) ÷ 100;

[0055] The adjustment amount of the flow rate of the third side water 3 (mL / min) = the original water flow rate (mL / min) × the movement amount of the third side water 3 (mm) ÷ 100.

[0056] In this embodiment, the raw water flow rate is 1 mL / min, the movement of the first side water 1 is 50 mm, the movement of the second side water 2 is 40 mm, and the movement of the third side water 3 is 35 mm. Therefore, in this embodiment, the water flow rate adjustment of the first side water 1 is 0.47 mL / min, the water flow rate adjustment of the second side water 2 is 0.40 mL / min, and the water flow rate adjustment of the third side water 3 is 0.35 mL / min.

[0057] Once the adjusted glass plate reaches the cold end, the tracking personnel should promptly measure the thickness of the glass plate at various points. If the thickness is unqualified or the internal tooth pitch is insufficient, the plate should be lowered. When the glass plate reaches the target thickness and the required width, the cold end cutting personnel will move the three edge water jets inward sequentially, adjust the water flow rate of the three edge water jets to the original flow rate, lower the spare blade, change the cutting dimensions, and quickly measure the actual dimensions of the glass plate. During adjustment, the inner side of the felt 7 of the first edge water jet 1 should be 75mm outside the extended blade path line, the inner side of the felt 7 of the second edge water jet 2 should be 110mm outside the extended blade path line, and the outer side of the felt 7 of the third edge water jet 3 should coincide with the edge of the glass plate.

Claims

1. A method for controlling edge water flow when modifying the specifications of Mini LED backplate glass, characterized in that, Between the outlet of the annealing furnace and the longitudinal cutting knife, there are three symmetrical edge water channels on both sides of the glass plate. These three edge water channels are the first edge water channel (1), the second edge water channel (2), and the third edge water channel (3) in sequence along the moving direction of the glass plate. 1) When adjusting the thickness of the glass plate Calculate the time it takes for the glass plate with adjusted thickness to reach the cold end. When it reaches the cold end, move the three side water channels so that the three side water channels are connected and the edge of the felt (7) of the third side water channel (3) extends beyond the edge of the glass plate. Adjust the water flow rate of the third side water channel (3). 2) When adjusting the width of the glass plate to increase Calculate the time it takes for the glass plate to reach the cold end after the width is adjusted. When it reaches the cold end, adjust the position of the three side water channels so that the edge of the felt (7) of the third side water channel (3) extends beyond the edge of the glass plate, and the water marks of the felt (7) of the three side water channels on the glass plate are connected along the width direction of the glass plate; at the same time, increase the water flow rate of the three side water channels. 3) When adjusting the width of the glass plate to become narrower Calculate the time it takes for the glass plate to reach the cold end after the width is adjusted. When it reaches the cold end, adjust the position of the three side water channels so that the edge of the felt (7) of the third side water channel (3) is located at the edge of the glass plate, and the water marks of the felt (7) of the three side water channels on the glass plate are connected along the width direction of the glass plate but do not overlap; at the same time, reduce the water flow rate of the three side water channels.

2. The edge water control method for Mini LED backplate glass when changing specifications as described in claim 1, characterized in that, In steps 1), 2), and 3), the formula for calculating the time for the glass plate to reach the cold end is as follows: Time to reach the cold end (min) = 60 × 2 × Distance from the end of the tin bath to the cold end roller 1 (m) ÷ [Main drive speed before adjustment (m / h) + Main drive speed after adjustment (m / h)] - 3 (min).

3. The edge water control method for Mini LED backplate glass when changing specifications as described in claim 1, characterized in that, In step 1), when it reaches the cold end, move the third edge water (3) so that the edge of its felt (7) extends 10-15mm beyond the edge of the glass plate.

4. The edge water control method for Mini LED backplate glass when changing specifications as described in claim 1, characterized in that, In step 1), the water flow rate adjustment amount (mL / min) of the third side water (3) = the original water flow rate (mL / min) × [the main drive speed before adjustment (m / h) ÷ the main drive speed after adjustment (m / h) - 1] × 0.

5.

5. The edge water control method for Mini LED backplate glass when changing specifications as described in claim 1, characterized in that, In step 2), when it reaches the cold end, adjust the position of the three edge water channels so that the edge of the felt (7) of the third edge water channel (3) extends 20-30mm beyond the edge of the glass plate.

6. The edge water control method for Mini LED backplate glass when changing specifications as described in claim 1, characterized in that, In steps 2) and 3), the water flow rate adjustments for the three side water channels are as follows: The adjustment amount of the first side water (1) flow rate (mL / min) = the original water flow rate (mL / min) × the movement amount of the first side water (1) (mm) ÷ 105; The flow rate adjustment amount of the second side water (2) (mL / min) = the original water flow rate (mL / min) × the movement amount of the second side water (2) (mm) ÷ 100; The flow rate adjustment amount (mL / min) of the third side water (3) = the original water flow rate (mL / min) × the movement amount (mm) of the third side water (3) ÷ 100.

7. The edge water control method for MiniLED backplate glass when changing specifications as described in claim 1, characterized in that, In steps 2) and 3), after the glass plate width is adjusted to be qualified, adjust the position of the three edge water channels so that the inner side of the felt (7) of the first edge water channel (1) is located 75mm outside the extension line of the knife path, the inner side of the felt (7) of the second edge water channel (2) is located 110mm outside the extension line of the knife path, and the outer side of the felt (7) of the third edge water channel (3) coincides with the edge of the glass plate; and adjust the water flow rate of the three edge water channels to the original water flow rate.

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