A device and method for correcting wear on substrate glass clamping rollers.

Abstract

This invention discloses a device and method for correcting wear on substrate glass clamping rollers, belonging to the field of liquid crystal glass substrate manufacturing processes. It includes a clamping roller group arranged symmetrically on both sides at multiple heights inside an annealing furnace. Each clamping roller group consists of two clamping rollers. A glass ribbon is pulled downwards between the two clamping rollers in the same clamping roller group. The glass ribbon divides the clamping rollers on both sides into fixed-side clamping rollers and floating-side clamping rollers. The roller coating material of the clamping rollers contains a dye. When the clamping rollers pull the glass ribbon downwards, the dye-filled clamping rollers create indentations on the glass ribbon. Each clamping roller is equipped with an external power supply and a servo motor connected to it. This invention can monitor the change in the diameter of the clamping rollers in real time, thereby correcting the motor speed and controlling the clamping rollers to operate more precisely, improving product quality and yield.

Description

Technical Field

[0001] This invention relates to the field of liquid crystal glass substrate manufacturing and molding processes, specifically to a device and method for correcting wear on substrate glass clamping rollers. Background Technology

[0002] Currently, domestic LCD glass substrates are mainly produced using the overflow method and the pull-down method. In the multi-roller clamping technology, the paired clamping rollers contact and clamp the glass strip, and the drive unit drives the two rollers to rotate in opposite directions. The two clamping rollers rotating in opposite directions exert a certain traction force on the glass strip through friction, thereby enabling the glass plate to reach the predetermined thickness.

[0003] In actual production, the gripping roller boss is made of a mixture of asbestos and refractory materials, which is pressed and sintered. During use, the boss will experience a certain degree of wear. The degree of wear is determined by physical factors such as usage time, gripping force, and high temperature environment. Since each gripping roller is driven by a separate drive unit with a servo motor as the drive source, when the process personnel actually control the gripping roller's traction effect on the glass strip, they will calculate the surface linear velocity of the boss by using the angular velocity provided by the drive unit and the boss radius. Although the initial intention of the production process is to control the gripping roller's traction effect on the glass strip by the surface linear velocity of the boss.

[0004] However, the continuous rotation of the clamping roller inside the glass furnace causes wear and tear, resulting in a change and reduction in the diameter of the clamping roller. Since the actual diameter of the clamping roller cannot be measured inside the furnace, the actual traction speed of the glass is less than the given traction speed when the short roller wears out and the actual controlled motor speed remains unchanged.

[0005] The traditional method involves cutting a piece of glass that flows down within a unit of time, measuring the length of the glass, and adjusting the diameter parameters based on the changes in the length. However, since the actual value of the roller is unknown, the adjustment is inaccurate, resulting in a lag in the adjustment of process parameters. Process personnel cannot compensate for the relevant process parameters in a timely manner, which in turn affects the process quality and yield.

[0006] Therefore, in order to enable the process parameters to be adjusted in a timely manner according to the state of the materials produced on site, it is necessary for those skilled in the art to provide a correction device and method for wear of substrate glass clamping rollers. Summary of the Invention

[0007] The purpose of this invention is to provide a device and method for correcting wear on substrate glass clamping rollers, which effectively solves the problem that existing clamping rollers are gradually worn during the liquid crystal glass pulling process, and personnel can only correct the diameter of the clamping rollers based on experience, resulting in a lag in process parameter adjustment and affecting process quality and yield.

[0008] The technical solution of the present invention is as follows:

[0009] A device and method for correcting wear on substrate glass clamping rollers includes clamping roller groups arranged symmetrically on both sides in multiple layers inside an annealing furnace. Each clamping roller group consists of two clamping rollers. A glass ribbon is pulled downward between the two clamping rollers in the same clamping roller group. The roller covering material of the clamping rollers contains a dye. When the clamping rollers pull the glass ribbon downward, the clamping rollers filled with dye will create indentations on the glass ribbon. An image measuring instrument is provided below the bottom clamping roller group for capturing images of the indentations created by the clamping rollers on the glass ribbon. An anti-deviation correction component is provided on one side of the glass ribbon, and the anti-deviation correction component drives the clamping rollers to achieve displacement.

[0010] Preferably, an overflow brick is provided above the topmost clamping roller assembly, which is installed on the top of the annealing furnace. The molten glass flows out from the overflow brick and flows downward to form a glass ribbon.

[0011] Preferably, the glass belt divides the clamping rollers on both sides into fixed-side clamping rollers and floating-side clamping rollers. The anti-deviation correction component is connected to the bottom of the fixed-side clamping rollers, and each clamping roller is equipped with a servo motor connected to an external power supply.

[0012] Preferably, the clamping roller group has no less than two layers, and in the initial state, the gap between each clamping roller group is consistent and in the same vertical direction.

[0013] Preferably, the working surface width of the upper clamping roller is smaller than that of the lower clamping roller, and the dyeing agent inside each clamping roller is inconsistent.

[0014] Preferably, the image measuring instrument is installed at the outlet of the furnace, and there are two image measuring instruments on one side of the glass strip, with the image measuring instruments located directly below the working surface of the clamping roller.

[0015] Preferably, the bottom of the servo motor is provided with a sliding plate, and a slider is symmetrically provided at the bottom of the sliding plate. The vertical cross-section of the slider is concave downwards, and a mounting plate is provided below the sliding plate.

[0016] Preferably, the mounting plate is mounted on the outside of the annealing furnace by means of a frame, and guide plates are symmetrically provided on the top of the mounting plate, with the slider slidably connected to the guide plates.

[0017] Preferably, the anti-deviation correction assembly includes a positioning plate, a second servo motor, a ball screw, and a moving plate. The positioning plate is connected to the side wall of the mounting plate and is located near the fixed-side clamping roller. The vertical cross-section of the positioning plate is L-shaped. The second servo motor is connected to the positioning plate and is connected to the ball screw via a coupling. The ball screw extends to the bottom of the sliding plate on the fixed-side clamping roller. The moving plate is fixedly connected to the bottom of the sliding plate on the fixed-side clamping roller, and the ball screw passes through the moving plate and is rotatably connected to it.

[0018] A method for correcting wear on substrate glass clamping rollers includes the following specific steps:

[0019] S1: First, adjust the gap size of each set of clamping rollers to keep it consistent in the initial state. After the molten glass enters the overflow brick, it flows down from the overflow brick. The fixed side clamping roller is limited by the anti-deviation correction component. The clamping roller on this side does not move left and right with the glass strip during operation. The floating side clamping roller on the other side moves slightly left and right along the slider. When the diameter of the fixed side clamping roller is worn, the glass strip pulled down by the center of the overflow brick deviates towards the fixed clamping roller side, thereby deviating from the original geometric position center of the equipment.

[0020] S2: After the diameter of the fixed-side clamping roller is reduced, the floating-side clamping roller will press the glass away from the geometric center of the original flow direction. After adjusting the speed of servo motor one, servo motor two is started. Servo motor two will drive the ball screw to rotate, causing the moving plate to move. The moving plate and the sliding plate cooperate with each other, so that the fixed-side clamping roller moves towards the direction of the glass strip, so that the glass liquid is always kept in the center position between the two clamping rollers.

[0021] S3: In the initial state, the working surface width of the clamping roller is measured as D, and the initial diameter is R. The working surface of the clamping roller is photographed using the image measuring instrument, and the actual working surface width of the clamping roller after wear during operation is accurately measured as d, which is equivalent to the length of the indentation produced by the clamping roller on the glass belt. We can obtain the instantaneous diameter R1 of the clamping roller at this time using the following calculation formula:

[0022] Once the value of R1 is calculated, the formula for the glass pull-down speed is:

[0023] Glass pull-down speed (mm / min) = Actual motor speed ( )*60(S)* *

[0024] The traction speed is a given input value from the process, and its value is a baseline setpoint. The speed of the servo motor is adjusted in a timely manner according to the real-time width of the clamping rollers, so that the clamping rollers on both sides of the glass belt maintain different speeds, but the glass belt can still be tractioned at a uniform speed.

[0025] The advantages of this invention are:

[0026] 1. This invention revolutionizes the traditional method of adjusting the downward traction of the glass strip. The traditional process basically involves cutting a piece of glass that flows down in a unit of time, measuring the length of the glass strip, and adjusting the diameter parameters according to the change in the length of the strip.

[0027] This invention is completely different: unlike traditional methods, this invention adopts a reverse approach. By adding a dye inside the clamping roller, the dye forms an indentation on the glass plate as it is pulled down. After wear, the indentation decreases. By reverse-engineering the shrinkage of the indentation, the required rotational speed of the servo motor is derived, thereby changing the glass pulling speed. This allows for real-time monitoring of changes in the clamping roller diameter and correction of the motor speed, enabling process parameters to be adjusted instantly based on the condition of the materials being produced on-site. This ensures that the glass pulling speed remains consistent even after changes in the clamping roller diameter, allowing for precise control of the clamping roller's operation and improving product yield.

[0028] This invention installs a second servo motor on the fixed side of the clamping roller. The second servo motor drives the ball screw to rotate. When the wear of the clamping roller is known, the second servo motor can drive the ball screw to move the clamping roller on the fixed side to the center position, so that the glass strip in contact with the clamping roller is always at the center line of the equipment, and the glass strip pulled down through the center of the overflow brick is always at the center line of the equipment, without any deviation in the pull-down position.

[0029] 3. When precise speed control of multiple clamping rollers is required simultaneously, the working surface width of the clamping rollers decreases layer by layer from top to bottom. Different dyes are added during the clamping roller coating process to color the clamping rollers. As a result, each layer of clamping rollers will leave a corresponding color band after clamping the glass ribbon. Furthermore, the imprint of the lower layer of clamping rollers will not completely cover the imprint of the upper layer of clamping rollers. This makes it easy for the subsequent image measuring instrument to distinguish and measure the corresponding imprint width value, thus clearly knowing the consumption of each layer of clamping rollers.

[0030] 4. This invention can be connected to the on-site production servo motor control system through the control process, and can automatically complete the correction of the clamping roller position and diameter in real time according to the signal fed back by the image measuring instrument, thereby improving the automation level of the device. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the clamping roller and glass belt components of the present invention;

[0032] Figure 2 This is an enlarged view of part of the clamping roller mechanism of the present invention;

[0033] Figure 3 This is a schematic diagram of the relationship between the working surface width of the clamping roller of the present invention;

[0034] Figure 4 This is a flowchart illustrating the usage method of the clamping roller correction device of the present invention.

[0035] Reference numerals in the attached diagram: 1. Clamping roller; 2. Glass belt; 3. Image measuring instrument; 4. Overflow brick; 1-1. Fixed side clamping roller; 1-2. Floating side clamping roller; 5. Servo motor one; 6. Sliding plate; 7. Slider; 8. Mounting plate; 9. Guide plate; 10. Positioning plate; 11. Servo motor two; 12. Ball screw; 13. Moving plate. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0037] like Figures 1 to 4 As shown, the present invention provides a device and method for correcting wear of substrate glass clamping rollers, comprising a clamping roller group arranged symmetrically on both sides in multiple layers inside an annealing furnace. Each clamping roller group consists of two clamping rollers 1. The glass strip 2 is pulled downward between the two clamping rollers 1 in the same clamping roller group. The roller covering material of the clamping roller 1 contains a dye. When the clamping roller 1 pulls the glass strip 2 downward, the clamping roller 1 filled with dye will create an indentation on the glass strip 2. An image measuring instrument 3 is provided below the bottom clamping roller group for capturing images of the indentations created by the clamping roller 1 on the glass strip 2. An anti-deviation correction component is provided on one side of the glass strip 2, which drives the clamping roller 1 to achieve displacement.

[0038] Unlike traditional methods, this invention adopts a reverse approach. By adding a dye inside the clamping roller 1, the dye forms an indentation on the glass plate as it is pulled down. After wear, the indentation decreases. By reverse-engineering the shrinkage of the indentation, the required speed of the servo motor 5 is determined, thereby changing the glass pulling speed. This allows for real-time monitoring of the diameter change of the clamping roller 1 and correction of the motor speed, enabling process parameters to be adjusted instantly according to the condition of the materials produced on-site. This precise control of the clamping roller 1's operation improves product yield.

[0039] Preferably, an overflow brick 4 is installed above the topmost clamping roller group, and the molten glass flows out from the overflow brick 4 and flows downward to form a glass ribbon 2.

[0040] Preferably, the glass strip 2 divides the clamping rollers 1 on both sides into a fixed side clamping roller 1-1 and a floating side clamping roller 1-2. The anti-deviation correction component is connected to the bottom of the fixed side clamping roller 1-1. Each clamping roller 1 is equipped with a servo motor 5 connected to an external power supply.

[0041] It should be noted that the fixed side clamping roller 1-1 serves to support and limit the spatial position of the glass plate. By default, this side clamping roller 1 does not move left or right with the glass strip 2 during operation. The other side clamping roller 1 is a floating side clamping roller 1-2, which moves left and right along the guide plate 9 at the top of the mounting plate 8 in real time according to the thickness change and swing of the glass strip 2.

[0042] When the diameter of the fixed-side clamping roller 1-1 wears down, the glass strip 2 pulled down by the center of the overflow brick 4 will deviate towards the fixed clamping roller 1 side, thus deviating from the original geometric center of the equipment. At this time, the wear amount of the diameter of the fixed-side clamping roller 1-1 can be measured by the method of the present invention, and the position of the fixed-side clamping roller 1-1 can be adjusted by the position control servo motor 11 of the clamping roller 1, so that the glass strip 2 pulled down by the center of the overflow brick 4 is always at the center line of the equipment, avoiding the situation where the position of the glass strip 2 deviates during the pulling down process.

[0043] Preferably, the number of layers of the clamping roller group is not less than two, and in the initial state, the gap between each clamping roller group is consistent and in the same vertical direction.

[0044] By using multiple layers of clamping rollers, the glass belt 2 can be pulled down repeatedly, and the clamping rollers 1 of each group can be set to be consistent in the initial state. This ensures that the glass belt 2 pulled down by the center of the overflow brick 4 is always in a vertical state, and keeps the glass belt 2 under uniform force during the pulling process.

[0045] Preferably, the working surface width of the upper clamping roller 1 is smaller than that of the lower clamping roller 1, and the dyeing agent inside each clamping roller 1 is inconsistent.

[0046] It should be noted that each layer of clamping roller 1 will leave a corresponding color band after pulling the glass strip 2, and the imprint of the lower layer of clamping roller 1 will not completely cover the imprint of the upper layer of clamping roller 1. This makes it convenient for the subsequent image measuring instrument 3 to distinguish and measure the corresponding imprint width value, so as to clearly know the consumption of each layer of clamping roller 1.

[0047] Preferably, the image measuring instrument 3 is installed at the outlet of the furnace, and there are two image measuring instruments 3 on one side of the glass strip 2, and the image measuring instruments 3 are located directly below the working surface of the clamping roller 1.

[0048] It should be noted that the image measuring instrument 3 can record the indentations left by the clamping roller 1 on the glass strip 2, thereby knowing the consumption of the clamping roller 1. Based on the above method, the motor speed can be flexibly adjusted to control the pull-down speed of the glass strip 2.

[0049] Preferably, the bottom of the servo motor 5 is provided with a sliding plate 6, and a slider 7 is symmetrically provided at the bottom of the sliding plate 6. The vertical cross section of the slider 7 is concave downwards, and a mounting plate 8 is provided below the sliding plate 6.

[0050] Preferably, the mounting plate 8 is mounted on the outside of the annealing furnace by means of a frame, and the top of the mounting plate 8 is symmetrically provided with guide plates 9, and the slider 7 is slidably connected to the guide plates 9.

[0051] It should be noted that the sliding plate 6 and the slider 7 are fixedly connected. The guide plate 9 on the top of the mounting plate 8 cooperates with the slider 7, so that the floating side clamping rollers 1-2 can be adjusted according to the width of the glass strip 2. At the same time, because the hardness of the clamping roller 1 is greater than that of the glass strip 2, it is designed to float, which can effectively prevent the glass strip 2 from being pinched during the downward pulling process, thus playing a role in protecting the glass strip 2.

[0052] Preferably, the anti-deviation correction assembly includes a positioning plate 10, a second servo motor 11, a ball screw 12, and a moving plate 13. The positioning plate 10 is connected to the side wall of the mounting plate 8 and is located near the fixed-side clamping roller 1-1. The vertical cross-section of the positioning plate 10 is L-shaped. The second servo motor 11 is connected to the positioning plate 10 and is connected to the ball screw 12 via a coupling. The ball screw 12 extends to the bottom of the sliding plate 6 on the fixed-side clamping roller 1-1. The moving plate 13 is fixedly connected to the bottom of the sliding plate 6 on the fixed-side clamping roller 1-1, and the ball screw 12 passes through the moving plate 13 and is rotatably connected to it.

[0053] It should be noted that by installing a servo motor 11 on the fixed side of the clamping roller 1, the servo motor 11 drives the ball screw 12 to rotate. When the wear of the clamping roller 1 is known, the servo motor 11 can drive the ball screw 12 to move the fixed-side clamping roller 1-1 to the middle position, so that the glass strip 2 in contact with the clamping roller 1 is always in the center line position of the equipment, and the glass strip 2 pulled down by the center of the overflow brick 4 is always in the center line position of the equipment, keeping the glass strip 2 in a vertical position and preventing the pull-down position from shifting.

[0054] Detailed usage and function of the above embodiments:

[0055] The clamping roller 1 is installed inside the annealing furnace. After processing, the initial working surface width and diameter of the clamping roller 1 are the same. Its initial working surface width is D and its diameter is R. After the glass liquid flows through the overflow brick 4, it will be pulled downward between the two clamping rollers 1. In the default state, the position of the fixed side clamping roller 1-1 will not change, and the position of the floating side clamping roller 1-2 is sliding, thereby avoiding the situation of pinching the glass strip 2. Under long-term traction, because the position of the fixed side clamping roller 1 will not change, the clamping roller 1 will wear, and its working surface width will decrease. Servo motor 11 is started. Servo motor 11 cooperates with the ball screw. The inside of the moving plate 13 has a ball nut that cooperates with the ball screw, thereby driving the slider 7 to move on the guide plate 9. The sliding plate 6 will move towards the glass strip 2, so that even after the diameter decreases, the position of the glass strip 2 will still not deviate.

[0056] Meanwhile, an image measuring instrument 3 is installed at the outlet of the annealing furnace. The image measuring instrument 3 monitors the indentation left by the clamping roller 1 on the glass belt 2 in real time. When the length of the indentation decreases, the image measuring instrument 3 measures the actual working surface width d of the clamping roller 1 after wear. Through the above calculation formula, we can obtain the actual diameter R1 of the clamping roller 1 after wear. Then, based on the formula, we can deduce the actual speed of the motor that needs to be adjusted, realizing the reverse derivation. This allows the glass pulling speed to be reversed by knowing the wear of the clamping roller 1 without changing the speed of glass pulling, thus ensuring the uniformity of the glass belt 2 pulling and improving the product yield.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A correction device for substrate glass pinch roll wear, characterized by, The application relates to a glass ribbon drawing device, which comprises a plurality of clamping roller groups arranged at different heights in the annealing furnace and symmetrically arranged left and right, each clamping roller group is composed of two clamping rollers (1), a glass ribbon (2) is drawn downward between the two clamping rollers (1) in the same clamping roller group, the roller cover material of the clamping roller (1) is mixed with a dyeing agent, when the glass ribbon (2) is drawn downward, the clamping roller (1) filled with the dyeing agent can produce a pressure mark on the glass ribbon (2), an image measuring instrument (3) is arranged below the lowest clamping roller group and used for shooting the pressure mark of the clamping roller (1) on the glass ribbon (2), a deviation prevention and correction assembly is arranged on one side of the glass ribbon (2), and the deviation prevention and correction assembly drives the clamping roller (1) to realize displacement.

2. The apparatus for correcting wear of a substrate glass pinch roll according to claim 1, wherein An overflow brick (4) is arranged above the uppermost clamping roller group and mounted on the top of the annealing furnace, and glass liquid flows out from the overflow brick (4) and forms the glass ribbon (2).

3. The apparatus for correcting wear of a substrate glass pinch roll according to claim 1, wherein The glass ribbon (2) divides the clamping rollers (1) on both sides into fixed side clamping rollers (1-1) and floating side clamping rollers (1-2), the deviation prevention and correction assembly is connected to the bottom of the fixed side clamping roller (1-1), and a servo motor (5) connected with an external power supply is arranged on each clamping roller (1).

4. The apparatus for correcting wear of a substrate glass pinch roll according to claim 1, wherein The number of layers of the clamping roller group is not less than two, the gaps between the clamping roller groups are consistent and in the same vertical direction in an initial state.

5. The apparatus for correcting wear of a substrate glass pinch roll according to claim 4, wherein The working face width of the clamping roller (1) in the upper layer is smaller than that of the clamping roller (1) in the lower layer, and the dyeing agents in the clamping rollers (1) in each layer are inconsistent.

6. The apparatus for correcting wear of a substrate glass pinch roll according to claim 1, wherein The image measuring instrument (3) is arranged at the outlet position of the annealing furnace, the number of the image measuring instruments (3) on one side of the glass ribbon (2) is two, and the image measuring instruments (3) are located directly below the working faces of the clamping rollers (1).

7. The apparatus for correcting wear of a substrate glass pinch roll according to claim 3, wherein The bottom of the servo motor (5) is provided with a sliding plate (6), the bottom of one sliding plate (6) is symmetrically provided with a sliding block (7), the vertical section of the sliding block (7) is a downward concave shape, and the bottom of the sliding plate (6) is provided with a mounting plate (8).

8. The apparatus for correcting wear of a substrate glass pinch roll according to claim 7, wherein The mounting plate (8) is mounted on the outside of the annealing furnace through a rack, the top of the mounting plate (8) is symmetrically provided with a guide plate (9), and the sliding block (7) is slidably connected to the guide plate (9).

9. The apparatus for correcting wear of a substrate glass pinch roll according to claim 7, wherein The deviation prevention correction assembly comprises a positioning plate (10), a servo motor two (11), a ball screw (12) and a moving plate (13), the positioning plate (10) is connected to the side wall of the mounting plate (8) and is located on the side close to the fixed side clamping roller (1-1), the vertical section of the positioning plate (10) is L-shaped, the servo motor two (11) is connected to the positioning plate (10), the servo motor two (11) is connected to the ball screw (12) through a shaft coupling, the ball screw (12) extends below the sliding plate (6) on the fixed side clamping roller (1-1), the moving plate (13) is fixedly connected to the bottom of the sliding plate (6) on the fixed side clamping roller (1-1), and the ball screw (12) penetrates through the moving plate (13) and is rotationally connected thereto.

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