Rapid checking and online cleaning method for roller way of plate glass annealing kiln

Abstract

The invention relates to a method for quickly checking and online cleaning a roller way of a plate glass annealing kiln, which comprises the following steps: (1) off-line sampling a glass sample at the tail end of the roller way, and positioning the transverse position of the defective roller way; (2) carrying out one-by-one visual inspection on the roller ways at the transverse position by using an observation device, and locking a problem roller way; (3) carrying out under-plate print verification on the roller way with the locking problem in the step (2) by adopting a jacking device; (4) judging the position of a problem roller way according to the verification result of the under-board imprint in the step (3); and (5) an online cleaning device is adopted for cleaning the defective roller way in the step (4), rapid troubleshooting is conducted, and online cleaning is finished. According to the method, off-line analysis positioning and on-line verification processing are combined, the original time-consuming and blind one-by-one trial and error process is converted into an accurate and rapid closed-loop process capable of being completed on line, the troubleshooting efficiency is remarkably improved, and the risk of production interruption is reduced.

Description

Technical Field

[0001] This invention relates to the field of roller conveyor defect inspection equipment, and in particular to a method for rapid inspection and online cleaning of roller conveyors in flat glass annealing kilns. Background Technology

[0002] Under-glass imprints are a typical surface quality defect in the production of ultra-thin flat glass, directly hindering product quality improvement. The root cause of under-glass imprints lies in the accumulation of contaminants on the surface of the annealing furnace rollers (which are typically made of ceramic, ceramic-coated, steel, or asbestos rollers). When these rollers come into contact with the underside of the glass, the glass, under its own weight, experiences relative displacement and friction with the contaminated rollers, ultimately transferring the contamination from the rollers onto the glass, forming a visible imprint.

[0003] Because annealing furnaces are complex, continuously operating systems with a large number of rollers, and because defects can occur instantaneously and covertly, locating specific problematic rollers becomes extremely difficult. Therefore, quickly and accurately identifying and cleaning contaminated rollers to reduce or even eliminate under-plate marks at the source has become a crucial step in improving the production quality of ultra-thin glass.

[0004] Currently, the technology for detecting and treating under-plate markings is significantly lagging and limited, facing two major technical challenges. The primary challenge is the inefficiency and limited effectiveness of existing detection methods. The industry-standard "reducing roller height method" involves lowering the height of each roller one by one to reduce contact with the glass plate, observing whether the markings disappear to infer the problem roller. However, under-plate marking detection relies mainly on manual offline inspection, with a trial-and-error cycle lasting 2 to 3 hours. For annealing furnaces with nearly a hundred rollers, a complete inspection is extremely time-consuming, severely impacting production continuity. More importantly, this method often fails to completely detach the glass plate from the rollers, resulting in insensitivity to minor markings and failing to achieve the desired detection results.

[0005] The roller conveyor defect inspection tool disclosed in CN219456147U utilizes a flexible separator to physically separate the glass plate from the roller conveyor. Although it theoretically achieves complete isolation, the tool itself introduces new uncertainties: the flexible material between the plate and the roller may have unknown effects on the lower surface of the glass, its inspection accuracy is limited to obvious defects, and the movement of the tool on the roller conveyor poses a risk of secondary contamination or mechanical damage to the roller conveyor surface.

[0006] CN208960419U discloses a glass substrate defect detection and recycling system, including a horizontally arranged first roller conveyor and a second roller conveyor. A tiltable roller conveyor is provided between the first and second roller conveyors. Above the tiltable roller conveyor are a photoelectric detector for sensing the arrival of the glass substrate and a detection device for detecting defects in the glass substrate. One side of the mounting frame of the tiltable roller conveyor is hinged to the top of a support rod, and the other side of the mounting frame is hinged to the top of an electric telescopic rod. A third roller conveyor is obliquely arranged below the second roller conveyor. A crushing device is provided at the conveying end of the third roller conveyor, and a conveyor belt is provided below the discharge port of the crushing device. This system relies solely on the detection device to detect defects in the glass substrate, which cannot accurately detect defects in glass substrates on multiple roller conveyors, resulting in low detection accuracy.

[0007] In conclusion, current technologies cannot meet the demand for fast, accurate, and risk-free online screening. There is an urgent need to develop more advanced online screening and cleanup technologies to fundamentally overcome this bottleneck. Summary of the Invention

[0008] To address the aforementioned technical problems, this invention provides a method for rapid inspection and online cleaning of the roller conveyor in a flat glass annealing furnace. This method is a complete process for identifying and handling defects under the plate, enabling online inspection and cleaning of the roller conveyor, shortening inspection and cleaning time, and improving defect inspection and handling efficiency.

[0009] To achieve this objective, the present invention adopts the following technical solution:

[0010] The present invention provides a method for rapid inspection and online cleaning of roller conveyors in flat glass annealing furnaces. The method includes: (1) taking offline samples of glass at the end of the roller conveyor to locate the transverse position of the problematic roller conveyor;

[0011] (2) Use an observation device to visually inspect each roller in the lateral position to identify the problematic roller;

[0012] (3) Use a lifting device to verify the under-plate imprint of the locking problem roller conveyor mentioned in step (2);

[0013] (4) Based on the results of the under-plate imprint verification described in step (3), determine the location of the problematic roller conveyor;

[0014] (5) Use an online cleaning device to clean the problematic roller conveyor described in step (4), and quickly investigate and clean online.

[0015] The method of this invention combines an observation device and a lifting device to quickly identify and locate contamination on the roller conveyor of a flat glass annealing furnace using visual and physical isolation methods. This improves the efficiency of the inspection and reduces the impact of the process on the quality of the sheet. Combined with an online cleaning device, it achieves precise and efficient online cleaning of the roller conveyor, thereby improving product quality. By combining "offline analysis and positioning" with "online verification and processing," the original time-consuming and blind trial-and-error process is transformed into a precise, fast, and online closed-loop process, which significantly improves the efficiency of the inspection and reduces the risk of production interruption.

[0016] As a preferred technical solution of the present invention, the lateral position of the problem roller in step (1) is perpendicular to the pulling direction of the glass sample.

[0017] As a preferred technical solution of the present invention, the offline sampling in step (1) includes: cutting the glass sample at the end of the roller conveyor into easily observable sizes in sequence, splicing and restoring it after inspection, and determining the precise position of the imprint under the plate in the width direction of the glass sample.

[0018] This invention uses end-point sampling to determine the lateral position of the problematic area on the roller, narrowing the problem area from the entire roller conveyor to a specific section. By measuring the distance between the imprint and the edge of the glass, and combining this with the width correspondence between the roller conveyor and the glass plate, the lateral position of the contaminant on the roller conveyor can be calculated in reverse, providing a basis for subsequent precise observation and locking of the target area.

[0019] As a preferred embodiment of the present invention, the width direction of the glass sample is perpendicular to the pulling direction of the glass sample.

[0020] As a preferred technical solution of the present invention, the observation device in step (2) includes a high-temperature camera device.

[0021] As a preferred technical solution of the present invention, the lens insertion depth of the high-temperature camera device is the lateral position of the problem roller in step (1).

[0022] The high-temperature imaging device described in this invention includes a high-temperature resistant endoscope; using the high-temperature resistant endoscope, the surface of the roller is observed visually to identify key targets for investigation; after determining the lateral location of the contamination, a preliminary online investigation is conducted using the high-temperature resistant endoscope; the lens of the high-temperature resistant endoscope is directly aimed at the suspicious area, and the presence of contaminants (such as dust accumulation, nodules, etc.) on the surface of the roller conveyor is directly observed to identify the target roller conveyor for investigation, thereby minimizing the number of roller conveyors to be inspected.

[0023] As a preferred technical solution of the present invention, the lifting device in step (3) includes an extension rod and a spiral lifting rod disposed at one end of the extension rod; a support plate is disposed on the spiral lifting rod; support rods are disposed at both ends of the support plate; and a high-temperature resistant roller is disposed at the top end of the support rod.

[0024] In this invention, the roller conveyor is inspected one by one by a lifting device. Visual observation alone cannot confirm whether the contaminant will actually cause visible marks on the plate. The lifting device can slightly lift the glass plate in the annealing furnace in a very short time, so as to physically isolate it from the target roller conveyor.

[0025] As a preferred technical solution of the present invention, the verification of the imprint on the plate includes: using a lifting device to lift the glass sample on the roller conveyor to physically isolate it from the problematic roller conveyor, and marking the glass sample before and after lifting.

[0026] As a preferred technical solution of the present invention, the determination of the location of the problematic roller in step (4) includes: if an imprint appears under the plate after the glass sample is isolated from the roller using a lifting device, the roller is determined to be without problems; if no imprint appears under the plate after the glass sample is isolated from the roller using a lifting device, the roller is determined to be a problematic roller.

[0027] In this invention, by comparing the time of the marks made on the glass sample by the lifting device with the appearance and disappearance of the marks on the end sample glass, it is possible to accurately determine which (or which rollers) caused the marks on the plate. The results of online operation and offline detection are directly linked to form a closed-loop verification, thereby finally identifying the problematic rollers that need to be addressed.

[0028] As a preferred technical solution of the present invention, the online cleaning device in step (5) includes an extension rod and a wiping end set at one end of the extension rod; the wiping end is connected to the extension rod through an end base; a reinforcing rib is provided between the end base and the extension rod; the wiping end is movably connected to the end base; the wiping end includes a box body and graphite material or high-temperature resistant flexible material disposed inside the box body.

[0029] In this invention, an online cleaning device is used to wipe problematic roller conveyors. After accurately locating the problematic roller conveyor, the online cleaning device can be used to wipe it online without stopping production, directly removing contaminants from its surface. The wiping end of the online cleaning device is made of graphite material or high-temperature resistant flexible material, which can achieve non-destructive cleaning of the roller conveyor. The online cleaning device can improve its strength by setting reinforcing ribs. The extension rod has a certain strength and is resistant to high temperatures. The end base supports and fixes the wiping end. The wiping end is movably connected to the end base, so that the wiping end remains parallel to the roller conveyor.

[0030] In this invention, the online cleaning device enters from the detachable side seal below the annealing kiln and precisely cleans and wipes the contaminated roller conveyor according to the length calculation. This directly eliminates the cause of the imprints on the plate from the source, achieving a fundamental solution to the problem and maximizing the continuity of production and the stability of product quality.

[0031] Compared with the prior art, the present invention has at least the following beneficial effects:

[0032] The method of this invention combines an observation device and a lifting device to quickly identify and locate contamination on the roller conveyor of a flat glass annealing furnace using visual and physical isolation methods. This improves the efficiency of the inspection and reduces the impact of the process on the quality of the sheet. Combined with an online cleaning device, it achieves precise and efficient online cleaning of the roller conveyor, thereby improving product quality. By combining "offline analysis and positioning" with "online verification and processing," the original time-consuming and blind trial-and-error process is transformed into a precise, fast, and online closed-loop process, which significantly improves the efficiency of the inspection and reduces the risk of production interruption. Attached Figure Description

[0033] Figure 1 This is a flowchart of a method for rapid inspection and online cleaning of the roller conveyor of a flat glass annealing furnace provided by the present invention.

[0034] Figure 2 This is a schematic diagram of step (1) of the method provided by the present invention, which is to locate the lateral position of the problem roller.

[0035] Among them, 110 is the running glass belt, 120 is the contaminant on the roller conveyor, 130 is the imprint under the glass plate, and S140 is the roller conveyor.

[0036] Figure 3 This is a schematic diagram of step (2) of the method provided by the present invention for calibrating the insertion position of the observation device.

[0037] Among them, 210 is the endoscope connection line and cooling water pipe, 220 is the endoscope protective water jacket, 230 is the endoscope camera, 240 is the roller conveyor contaminant, and 250 is the roller conveyor.

[0038] Figure 4 This is a schematic diagram of the insertion position of the observation device in step (2) of the method provided by the present invention.

[0039] Among them, 310 is a glass belt, 320 is a detachable side seal at the bottom of the annealing furnace, 330 is a high-temperature resistant sight glass, 340 is a roller conveyor, and 350 is the breast wall of the annealing furnace.

[0040] Figure 5 This is a schematic diagram of the lifting device in step (3) of the method provided by the present invention.

[0041] Among them, 410 is the support rod, 420 is the support plate, 430 is the extension rod, 440 is the spiral lifting rod, and 450 is the high-temperature resistant roller.

[0042] Figure 6 This is a schematic diagram of the insertion position of the lifting device in step (3) of the method provided by the present invention.

[0043] Among them, 510 is the glass belt, 520 is the detachable side seal at the bottom of the annealing furnace, 530 is the lifting device, 540 is the roller conveyor, and 550 is the breast wall of the annealing furnace.

[0044] Figure 7 This is a schematic diagram of the online cleaning device in step (5) of the method provided by the present invention.

[0045] Among them, 610 is the wiping end, 620 is the reinforcing rib, 630 is the extension rod, 640 is the end base, and 650 is the movable connection.

[0046] Figure 8 This is a schematic diagram of the insertion position of the online cleaning device in step (5) of the method provided by the present invention.

[0047] Among them, 710 is the glass belt, 720 is the detachable side seal at the bottom of the annealing furnace, 730 is the online cleaning device, 740 is the roller conveyor, and 750 is the breast wall of the annealing furnace. Detailed Implementation

[0048] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, the following examples are merely simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention is determined by the claims.

[0049] Example 1

[0050] This embodiment provides a method for rapid inspection and online cleaning of the roller conveyor of a flat glass annealing furnace, the method comprising:

[0051] (1) Offline sampling of the glass sample at the end of the roller conveyor to locate the lateral position of the problematic roller conveyor; the lateral position of the problematic roller conveyor is perpendicular to the pulling direction of the glass sample; the offline sampling includes: cutting the glass sample at the end of the roller conveyor into easily observable sizes in sequence, splicing and restoring it after inspection, and determining the precise position of the imprint under the plate in the width direction of the glass sample; the width direction of the glass sample is perpendicular to the pulling direction of the glass sample;

[0052] (2) Use an observation device to visually inspect each roller in the lateral position to identify the problematic roller; the observation device includes a high-temperature camera; the insertion depth of the lens of the high-temperature camera is equal to the lateral position of the problematic roller in step (1);

[0053] (3) Use a lifting device to verify the under-plate imprint of the locked problem roller in step (2); the lifting device includes an extension rod 430 and a spiral lifting rod 440 set at one end of the extension rod; a support plate 420 is provided on the spiral lifting rod 440; support rods 410 are provided at both ends of the support plate 420; a high-temperature resistant roller 450 is provided at the top of the support rod 410; the under-plate imprint verification includes: using the lifting device to lift the glass sample on the roller to physically isolate it from the problem roller, and marking the glass sample before and after lifting;

[0054] (4) Based on the results of the under-plate imprint verification in step (3), determine the location of the problematic roller conveyor; the determination of the location of the problematic roller conveyor includes: if the under-plate imprint appears after using the lifting device to isolate the glass sample from the roller conveyor, then the roller conveyor is determined to be without problems; if the under-plate imprint does not appear after using the lifting device to isolate the glass sample from the roller conveyor, then the roller conveyor is determined to be a problematic roller conveyor.

[0055] (5) The problem roller conveyor described in step (4) is cleaned using an online cleaning device, and the quick investigation and online cleaning are completed; the online cleaning device includes an extension rod 630 and a wiping end 610 disposed at one end of the extension rod 630; the wiping end 610 is connected to the extension rod 630 through an end base 640; a reinforcing rib 620 is provided between the end base 640 and the extension rod 630; the wiping end 610 is movably connected to the end base 640 650; the wiping end 610 includes a box body and graphite material or high-temperature resistant flexible material disposed inside the box body.

[0056] In summary, this invention provides a method for rapid inspection and online cleaning of the roller conveyor of a flat glass annealing furnace. This method combines an observation device and a lifting device, utilizing visual and physical isolation methods to rapidly inspect and locate contamination on the roller conveyor of the flat glass annealing furnace, improving inspection efficiency and reducing the impact of the process on the surface quality. Furthermore, by incorporating an online cleaning device, it achieves precise and efficient online cleaning of the roller conveyor, improving product quality. By combining "offline analysis and positioning" with "online verification and processing," the previously time-consuming and blind trial-and-error process is transformed into a precise, rapid, and online closed-loop process, significantly improving inspection efficiency and reducing the risk of production interruption.

[0057] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A method for rapid inspection and online cleaning of the roller conveyor of a flat glass annealing furnace, characterized in that, The method includes: (1) Take offline samples of the glass at the end of the roller conveyor to locate the lateral position of the problematic roller conveyor; (2) Use an observation device to visually inspect each roller in the lateral position to identify the problematic roller; (3) Use a lifting device to verify the under-plate imprint of the locking problem roller conveyor mentioned in step (2); (4) Based on the results of the under-plate imprint verification described in step (3), determine the location of the problematic roller conveyor; (5) Use an online cleaning device to clean the problematic roller conveyor described in step (4), and quickly investigate and clean online.

2. The method according to claim 1, characterized in that, In step (1), the lateral position of the problem roller is perpendicular to the pulling direction of the glass sample.

3. The method according to claim 1 or 2, characterized in that, The offline sampling in step (1) includes: cutting the glass sample at the end of the roller conveyor into easily observable sizes in sequence, splicing and restoring it after inspection, and determining the precise position of the imprint under the plate in the width direction of the glass sample.

4. The method according to any one of claims 1-3, characterized in that, The width direction of the glass sample is perpendicular to the pulling direction of the glass sample.

5. The method according to any one of claims 1-4, characterized in that, The observation device in step (2) includes a high-temperature camera.

6. The method according to any one of claims 1-5, characterized in that, The lens insertion depth of the high-temperature camera device is the lateral position of the problem roller in step (1).

7. The method according to any one of claims 1-6, characterized in that, The lifting device in step (3) includes an extension rod and a spiral lifting rod disposed at one end of the extension rod; a support plate is disposed on the spiral lifting rod; support rods are disposed at both ends of the support plate; and a high-temperature resistant roller is disposed at the top end of the support rod.

8. The method according to any one of claims 1-7, characterized in that, The verification of the imprint on the plate includes: using a lifting device to lift the glass sample on the roller conveyor to physically isolate it from the problematic roller conveyor, and marking the glass sample before and after lifting.

9. The method according to any one of claims 1-8, characterized in that, Step (4) involves determining the location of the problematic roller conveyor: if an imprint appears under the plate after using a lifting device to isolate the glass sample from the roller conveyor, then the roller conveyor is determined to be without problems; if an imprint does not appear under the plate after using a lifting device to isolate the glass sample from the roller conveyor, then the roller conveyor is determined to be a problematic roller conveyor.

10. The method according to any one of claims 1-9, characterized in that, The online cleaning device in step (5) includes an extension rod and a wiping end set at one end of the extension rod; the wiping end is connected to the extension rod through an end base; a reinforcing rib is provided between the end base and the extension rod; the wiping end is movably connected to the end base; the wiping end includes a box body and graphite material or high-temperature resistant flexible material set inside the box body.

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