Glass tube defect inspection equipment

Abstract

The utility model provides glass tube defect inspection equipment, which comprises a conveying assembly, a glass tube to be inspected is arranged on the conveying assembly, the conveying assembly comprises a first conveying structure and a second conveying structure, and the first conveying structure and the second conveying structure are arranged at an interval; and the appearance inspection assembly is located between the first conveying structure and the second conveying structure, the appearance inspection assembly comprises a mounting frame structure and a plurality of shooting structures, and the multiple shooting structures are connected with the mounting frame structure and all face the to-be-inspected glass tube. According to the technical scheme, the problem that in the prior art, in the glass tube appearance inspection process, products are unqualified due to missing inspection is effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of glass inspection, and in particular to a glass tube defect inspection device. BACKGROUND

[0002] As an intermediate product of pharmaceutical packaging materials, medium borosilicate glass tubes are often processed into vials, ampoules, cartons and pre-filled containers. Due to their good stability, the end products are widely used. The product quality of glass tubes is crucial, in addition to dimensional defects, there are also appearance defects such as stripes, air lines, stones, nodules and crystallization.

[0003] Generally, in the production process, a camera for shooting is usually arranged above the conveying belt, and an image is obtained by shooting the glass tube. By comparing the shot image with the defect image, it is determined whether the appearance of the glass tube meets the standard.

[0004] In the prior art, the camera is arranged above the conveying belt, and the shooting angle is limited, and there is a shooting dead angle, so that part of the appearance defects are missed, which affects the quality of the subsequent products, such as CN107008669A. UTILITY MODEL CONTENT

[0005] One of the technical problems to be solved by the present application is that in the glass tube appearance inspection process, there is a problem of product unqualification caused by missing detection.

[0006] To solve the above technical problems, the present application provides a glass tube defect inspection device.

[0007] The glass tube defect inspection device provided by the present application comprises: a conveying assembly, the glass tube to be inspected is arranged on the conveying assembly, the conveying assembly comprises a first conveying structure and a second conveying structure, the first conveying structure and the second conveying structure are arranged at intervals; an appearance inspection assembly, the appearance inspection assembly is located between the first conveying structure and the second conveying structure, the appearance inspection assembly comprises a mounting rack structure and a plurality of shooting structures, the plurality of shooting structures are connected with the mounting rack structure and are arranged towards the glass tube to be inspected.

[0008] In some embodiments, the distance between the first conveying structure and the second conveying structure is less than half the length of the glass tube to be inspected.

[0009] In some embodiments, the mounting rack structure comprises a mounting rack and a supporting part, the supporting part is connected with the mounting rack, the plurality of shooting structures are connected with the mounting rack, the mounting rack is annular, and the glass tube to be inspected is arranged in the mounting rack.

[0010] In some embodiments, the mounting rack structure further comprises an adjusting part, the adjusting part has a threaded segment, the supporting part has a threaded hole, and the threaded segment cooperates with the threaded hole.

[0011] In some embodiments, the plurality of shooting structures are movably connected with the mounting frame.

[0012] In some embodiments, the mounting frame has an elongated hole, the plurality of shooting structures include a mounting seat and a bolt, the bolt is arranged in the elongated hole and the mounting seat, and the bolt is matched with a nut.

[0013] In some embodiments, the shooting structure further includes a linear driving part and a camera, the linear driving part is connected with the mounting seat, a driving direction of the linear driving part is parallel to a plane where the mounting frame is located, and the camera is connected with the linear driving part.

[0014] In some embodiments, the camera is rotatably connected with the linear driving part.

[0015] In some embodiments, the glass tube defect inspection device further includes a position inspection assembly, the position inspection assembly is connected with the mounting frame structure.

[0016] In some embodiments, the glass tube defect inspection device further includes a limiting assembly, the limiting assembly is arranged on both sides of the conveying assembly.

[0017] Through the above technical solution, the glass tube defect inspection device provided by the present application is provided, both ends of the glass tube to be inspected are located on the first conveying structure and the second conveying structure respectively, and the first conveying structure and the second conveying structure are arranged at intervals, so that the glass tube to be inspected is partially suspended, the plurality of shooting structures are located between the first conveying structure and the second conveying structure and are arranged towards the glass tube to be inspected, so that the suspended part of the glass tube to be inspected is not blocked, the plurality of shooting structures shoot photos of the glass tube from multiple angles, and the shooting dead angle is avoided. The technical solution of the present application effectively solves the problem of product unqualification caused by missed inspection in the glass tube appearance inspection process in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0019] Figure 1 A left view structural schematic diagram of an appearance inspection assembly of a glass tube defect inspection device disclosed by Embodiment One of the present application is shown;

[0020] Figure 2 A front view structural schematic diagram of the glass tube defect inspection device of Figure 1 is shown;

[0021] Figure 3Fig. 2 shows a left view structural schematic diagram of the appearance inspection assembly of the glass tube defect inspection equipment disclosed in Embodiment Two of the present application;

[0022] Figure 4 Fig. 3 shows a top view structural schematic diagram of the glass tube defect inspection equipment of Figure 3

[0023] BRIEF DESCRIPTION OF DRAWINGS

[0024] 10, conveying assembly; 11, first conveying structure; 12, second conveying structure; 20, appearance inspection assembly; 21, mounting rack structure; 211, mounting rack; 212, support part; 213, adjusting part; 22, shooting structure; 221, mounting seat; 222, bolt; 223, linear driving part; 30, position inspection assembly; 40, limiting assembly; 41, horizontal driving structure; 42, limiting baffle. DETAILED DESCRIPTION

[0025] The embodiments of the present application will be further described below in conjunction with the drawings and examples. The following detailed description of the examples and drawings are intended to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, and the present application can be implemented in many different forms, and is not limited to the specific examples of the present application, but includes all technical solutions falling within the scope of the claims.

[0026] The present application provides these examples in order to make the present application thorough and complete, and fully express the scope of the present application to those skilled in the art. It should be noted that: unless otherwise specified, the relative arrangement of components and steps, the composition of materials, numerical expressions and values set forth in these examples should be interpreted as merely exemplary, and not as a limitation.

[0027] It should be noted that, in the description of the present application, unless otherwise specified, the meaning of "a plurality of" is greater than or equal to two; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] ​Furthermore, the terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well.

[0029] It should also be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0030] All terms used in this application have the same meaning as understood by one of ordinary skill in the art to which this application pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0031] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0032] like Figure 1 and Figure 2 As shown, the glass tube defect inspection equipment disclosed in Embodiment 1 of this application includes: a conveying assembly 10 and an appearance inspection assembly 20. The glass tube to be inspected is disposed on the conveying assembly 10. The conveying assembly 10 includes a first conveying structure 11 and a second conveying structure 12, which are arranged at intervals. The appearance inspection assembly 20 is located between the first conveying structure 11 and the second conveying structure 12. The appearance inspection assembly 20 includes a mounting frame structure 21 and a plurality of imaging structures 22. The plurality of imaging structures 22 are connected to the mounting frame structure 21 and are all oriented toward the glass tube to be inspected.

[0033] The technical scheme of the application embodiment one is applied to the situation that the two ends of the glass tube to be inspected are respectively located on the first conveying structure 11 and the second conveying structure 12. Since the first conveying structure 11 and the second conveying structure 12 are arranged at intervals, the glass tube to be inspected is partially suspended. The plurality of shooting structures 22 are located between the first conveying structure 11 and the second conveying structure 12 and are arranged towards the glass tube to be inspected. Therefore, the suspended part of the glass tube to be inspected is not blocked. The plurality of shooting structures 22 shoot the glass tube from multiple angles to avoid the occurrence of shooting dead angles. The technical scheme of the embodiment one effectively solves the problem of product unqualification caused by missed inspection in the process of glass tube appearance inspection in the prior art.

[0034] As shown in Figure 1 and Figure 2 , in the technical scheme of the embodiment one, the interval between the first conveying structure 11 and the second conveying structure 12 is less than half the length of the glass tube to be inspected. In the technical scheme of the embodiment one, the glass tube is conveyed along the first conveying structure 11 towards the second conveying structure 12. If the interval between the first conveying structure 11 and the second conveying structure 12 is greater than half the length of the glass tube to be inspected, the area below more than half of the glass tube will have no support in the conveying process, which causes one end of the glass tube to be inclined downward and to fall from the interval between the first conveying structure 11 and the second conveying structure 12. Not only the appearance inspection of the glass tube cannot be completed, but also the glass tube will be damaged, which leads to a low product qualification rate.

[0035] As shown in Figure 1 and Figure 2 , in the technical scheme of the embodiment one, the mounting rack structure 21 includes a mounting rack 211 and a support part 212. The support part 212 is connected with the mounting rack 211. The plurality of shooting structures 22 are connected with the mounting rack 211. The mounting rack 211 is annular. The glass tube to be inspected is arranged in the mounting rack 211. The center of the annular mounting rack 211 is located on the same straight line as the axis of the glass tube to be inspected. This ensures that the intervals between the shooting structures 22 and the glass tube are all the same, which facilitates the subsequent processing of the pictures obtained by shooting. In the technical scheme of the embodiment one, three groups of shooting structures 22 are arranged. The three groups of shooting structures 22 are uniformly distributed on the annular mounting rack 211. That is, the central angles of the positions of any two shooting structures 22 on the mounting rack 211 are 120°. The arrangement of the three groups of shooting structures 22 can obtain the appearance image of the glass tube in one round without any shooting dead angle. At the same time, the number of the shooting structures 22 is small, and the cost is low. The appearance inspection assembly 20 further includes a light source structure. The light source structure is selected to be a strip light source and is arranged parallel to the glass tube to be inspected. This avoids the uneven change of light on the surface of the glass tube, which affects the subsequent image observation. The strip light source is connected with the inner wall of the mounting rack 211, which avoids the mounting rack 211 from blocking the light emitted by the strip light source from irradiating the surface of the glass tube, so that part of the surface of the glass tube is not illuminated.

[0036] As Figure 3 and Figure 4 shown, the technical scheme of embodiment two is different from that of embodiment one in that the mounting rack structure 21 further comprises an adjusting part 213, the adjusting part 213 has a threaded section, the supporting part 212 has a threaded hole, and the threaded section cooperates with the threaded hole. Turning the adjusting part 213, the height of the supporting part 212 in the vertical direction changes under the action of threaded transmission, driving the mounting rack 211 to move in the vertical direction, facilitating the alignment of the center of the annular mounting rack 211 with the glass tube to be inspected, and further ensuring that the distances between the shooting structures 22 and the glass tube to be inspected are the same, facilitating subsequent image processing.

[0037] As Figure 3 and Figure 4 shown, in the technical scheme of embodiment two, the plurality of shooting structures 22 are movably connected with the mounting rack 211. Moving the shooting structures 22 changes the positions of the shooting structures 22 on the mounting rack 211, thereby changing the shooting angles and further avoiding the occurrence of shooting dead angles.

[0038] As Figure 3 and Figure 4 shown, in the technical scheme of embodiment two, the mounting rack 211 has a long hole, the plurality of shooting structures 22 comprise mounting seats 221 and bolts 222, the bolts 222 are arranged in the long hole and the mounting seats 221, and the bolts 222 cooperate with nuts. The long hole is an arc-shaped hole, the arc surface of the arc-shaped hole is parallel to the inner and outer wall surfaces of the mounting rack 211, loosening the nuts can disassemble the mounting seats 221, changing the mounting positions of the mounting seats 221; inserting the bolts 222 into the long hole and tightening the nuts can fix the mounting seats. The arrangement of this structure facilitates the staff to set the number of shooting structures 22 and the distances between adjacent shooting structures 22 according to the needs, so as to comprehensively inspect the appearance of the glass tube.

[0039] As Figure 3 and Figure 4As shown in the technical scheme of the second embodiment, the photographing structure 22 further comprises a linear driving part 223 and a camera, the linear driving part 223 is connected with the mounting seat 221, the driving direction of the linear driving part 223 is parallel to the plane where the mounting frame 211 is located, and the camera is connected with the linear driving part 223. The linear driving part 223 comprises a sliding rail and a sliding block, the sliding block is movably connected with the sliding rail, the sliding rail is arranged along the radial direction of the mounting frame 211, the camera is connected with the sliding block, and the linear driving part 223 drives the camera to approach or move away from the glass tube to be inspected, so as to change the distance between the camera and the glass tube to be inspected, so as to be suitable for inspecting glass tubes with different diameters and have stronger versatility. The camera is connected with a signal line, image information obtained by photographing is transmitted to the control terminal, the control terminal is internally provided with a glass tube product defect library, and whether the quality of the glass tube meets the standard is judged by comparing the image obtained by photographing with the image in the library. The camera is selected to have a timing photographing function, and the photographing time interval is greater than the distance between the first conveying structure 1 and the second conveying structure 12 divided by the conveying speed of the two, so as to ensure that each section of the glass tube is photographed during the conveying process without omission, and the missed detection phenomenon is avoided.

[0040] As shown in the technical scheme of the second embodiment, Figure 3 and Figure 4 As shown in the technical scheme of the second embodiment, the camera is rotatably connected with the linear driving part 223. The camera and the sliding block are connected by a spherical hinge, and the structure can change the included angle between the camera irradiation angle and the glass tube, so as to photograph the glass tube to be inspected from more angles, and the appearance inspection is more complete.

[0041] As shown in the technical scheme of the second embodiment, Figure 3 and Figure 4 As shown in the technical scheme of the second embodiment, the glass tube defect inspection equipment further comprises a position inspection assembly 30, and the position inspection assembly 30 is connected with the mounting frame structure 21. The position inspection assembly 30 is selected to be an infrared detector, and the position inspection assembly 30 is used to inspect the relative position relationship between the glass tube and the conveying assembly, and judge whether the axis of the glass tube to be inspected is parallel to the conveying direction. If the axis of the glass tube is not parallel to the conveying direction, a photographing dead angle is also easily generated during photographing, which affects the subsequent appearance inspection. The position inspection assembly 30 is arranged to facilitate the staff to timely find the position deviation of the glass tube, so as to timely adjust.

[0042] As shown in the technical scheme of the second embodiment, Figure 3 and Figure 4As shown, in the technical scheme of the embodiment two, the glass tube defect inspection equipment further comprises a limiting assembly 40 arranged on both sides of the conveying assembly 10. The limiting assembly 40 comprises a horizontal driving structure 41 and a limiting baffle 42 connected to the output end of the horizontal driving structure 41. The limiting baffle 42 is arranged parallel to the conveying direction of the conveying assembly 10, and the horizontal driving structure 41 is arranged perpendicular to the conveying direction of the conveying assembly 10. Under the action of the horizontal driving structure 41, the limiting baffle 42 moves close to or away from the glass tube to be inspected. The limiting assembly 40 is provided with two groups, and the two groups of limiting assemblies 40 are arranged on both sides of the glass tube. When the position inspection assembly 30 detects that the glass tube is inclined, the two horizontal driving structures 41 drive the two limiting baffles 42 to move close to each other to clamp the glass tube. Under the action of the limiting baffle 42, the glass tube moves to the axis parallel to the conveying direction, and then the two horizontal driving structures 41 drive the two limiting baffles 42 to move away from the glass tube to avoid the limiting baffle 42 from shielding the shooting structure 22, thereby affecting the shooting of the shooting structure 22 on the glass tube to be inspected.

[0043] From the above, it can be seen that a product defect library is established: through artificial quality inspection, product defect pictures are obtained and stored in a PC; according to the company's quality standards, qualified product pictures and unqualified product pictures are distinguished; through continuous verification, a standard product defect library is obtained. A bar light source (light source structure) is used to provide light, and then three linear array cameras are respectively set around the glass tube and uniformly distributed, that is, the included angle of each camera to the glass tube is 120°. When the three cameras take pictures, they take pictures at the same time and transmit data information to the PC, and the PC performs image stitching. The stitched image is preprocessed: grayscale: convert the color image to a grayscale image to simplify the processing process; filter denoising: use methods such as median filtering and Gaussian filtering to remove noise in the image and improve image quality; contrast enhancement: enhance the contrast of the image through histogram equalization and other methods to make the outlines of the crystals and stones more clear. Feature extraction: texture features: use methods such as gray level co-occurrence matrix (GLCM) and local binary pattern (LBP) to extract texture features of the image, which are helpful for identifying crystals and stones in the glass; shape features: extract shape features of the stone or crystal region, such as aspect ratio, circularity, area, etc., to distinguish different types of defects; gray level features: analyze the gray level distribution of the stone or crystal region, such as mean gray level and variance, to further distinguish them from normal glass regions. Image segmentation: threshold segmentation: set a threshold according to the gray level or texture features of the image to segment the image into stone / crystal regions and normal glass regions; edge detection: use edge detection algorithms such as Canny and Sobel to extract the edge contours of the stone / crystal regions; region growing: start from a known stone / crystal seed point and grow regions based on the similarity (such as gray level, texture, etc.) between pixels to segment out complete stone / crystal regions. Post-processing and recognition: morphological processing: use morphological operations such as erosion, dilation, opening, and closing to further process the segmented stone / crystal regions to remove noise and thin out the contours; classification and recognition: input the extracted features into a classifier (such as a support vector machine or a neural network) for training and learning to achieve automatic recognition of stones / crystals. The image detection of crystals and stones in glass requires the combination of multiple image processing techniques and methods, which can use image processing libraries and algorithms such as OpenCV and MATLAB to achieve the required image processing tasks, and compare with the product defect pictures in the gallery, and pass the information that exceeds the quality requirements to the sorting machine for scrap processing after the glass tube is cut.

[0044] Thus far, the embodiments of the present application have been described in detail. In order to avoid obscuring the concept of the present application, some details known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions of the present application according to the above description.

[0045] Although some specific embodiments of the present application have been described in detail by way of examples, one skilled in the art should understand that the above examples are only for the purpose of illustration, but not for the purpose of limiting the scope of the present application. One skilled in the art should understand that the above embodiments can be modified or equivalent replacements can be made to some technical features without departing from the scope and spirit of the present application. In particular, each technical feature mentioned in each embodiment can be combined in any manner as long as there is no structural conflict.

Claims

1. A glass tube defect inspection device, characterized in that, include: A conveying assembly (10) is provided on which the glass tube to be inspected is disposed. The conveying assembly (10) includes a first conveying structure (11) and a second conveying structure (12), which are arranged alternately. The appearance inspection component (20) is located between the first conveying structure (11) and the second conveying structure (12). The appearance inspection component (20) includes a mounting frame structure (21) and multiple shooting structures (22). The multiple shooting structures (22) are connected to the mounting frame structure (21) and are all oriented toward the glass tube to be inspected.

2. The glass tube defect inspection equipment according to claim 1, characterized in that, The distance between the first conveying structure (11) and the second conveying structure (12) is less than half the length of the glass tube to be inspected.

3. The glass tube defect inspection equipment according to claim 1, characterized in that, The mounting frame structure (21) includes a mounting frame (211) and a support part (212). The support part (212) is connected to the mounting frame (211). Multiple shooting structures (22) are connected to the mounting frame (211). The mounting frame (211) is annular. The glass tube to be inspected passes through the mounting frame (211).

4. The glass tube defect inspection equipment according to claim 3, characterized in that, The mounting bracket structure (21) further includes an adjustment section (213), which has a threaded section, and the support section (212) has a threaded hole, wherein the threaded section and the threaded hole cooperate with each other.

5. The glass tube defect inspection equipment according to claim 3, characterized in that, The multiple shooting structures (22) are movably connected to the mounting bracket (211).

6. The glass tube defect inspection equipment according to claim 5, characterized in that, The mounting bracket (211) has an elongated hole, and the plurality of shooting structures (22) include a mounting base (221) and a bolt (222), the bolt (222) passing through the elongated hole and the mounting base (221), the bolt (222) cooperating with a nut.

7. The glass tube defect inspection equipment according to claim 6, characterized in that, The shooting structure (22) further includes a linear drive unit (223) and a camera. The linear drive unit (223) is connected to the mounting base (221). The driving direction of the linear drive unit (223) is parallel to the plane of the mounting bracket (211). The camera is connected to the linear drive unit (223).

8. The glass tube defect inspection equipment according to claim 7, characterized in that, The camera is rotatably connected to the linear drive unit (223).

9. The glass tube defect inspection equipment according to any one of claims 1 to 8, characterized in that, The glass tube defect inspection equipment also includes a position inspection component (30), which is connected to the mounting frame structure (21).

10. The glass tube defect inspection equipment according to claim 9, characterized in that, The glass tube defect inspection equipment also includes a limiting component (40), which is disposed on both sides of the conveying component (10).

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