A roll-bond web on-line missing punch detector

Abstract

The utility model discloses a kind of online leak punch detectors of rolling material belt, including rack, conveying device, camera sensor component and backlight assembly. Backlight assembly includes crossbeam, U-shaped support, white light background lamp and light transmission color plate;Camera sensor component lens is equipped with the narrow band pass filter matched with light transmission color plate, and its outside cover has the anti-interference box with magnetic attraction hinge door. The utility model passes through the optical filtering system formed by light transmission color plate and narrow band pass filter, effectively filters out the reflection interference on the surface of metal material belt, significantly reduces false alarm rate;Its backlight assembly adopts modular design, light transmission color plate is accurately positioned by limiting post, convenient to replace maintenance, overall structure improves detection reliability while ensuring use convenience.

Description

Technical Field

[0001] This utility model relates to the field of rolling strip processing technology, and in particular to an online punching hole detector for rolling strip. Background Technology

[0002] Rolled strip is a type of metal strip that has been flattened, straightened, or shaped through a rolling process. It has wide applications in industries such as aerospace and automobile manufacturing.

[0003] Currently, online image recognition systems are commonly used to inspect rolled material strips for missing punches. An existing online image recognition system includes a frame, a conveyor, a camera sensor positioned above the rolled material strip, and a white backlight positioned below the strip. When the system detects a missing punch, it automatically stops and waits for further processing.

[0004] However, due to the highly reflective properties of the metal rolling strip surface, external light sources such as overhead fluorescent lights in the workshop environment easily create bright spots and stray light reflections on its surface, causing interference. These reflected lights interfere with the background light passing through the holes during imaging, severely hindering the camera's accurate capture and identification of hole features, leading to a significant increase in the system's false alarm rate. This problem not only affects the reliability of the detection results, but the frequent false alarms and shutdowns also severely restrict the continuity and overall efficiency of the production line. Utility Model Content

[0005] The purpose of this invention is to provide an online punching detector for rolled strips to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An online punching detector for rolled material strip includes a frame, a conveying device for conveying the rolled material strip, a camera sensor assembly disposed above the rolled material strip, and a backlight assembly disposed below the rolled material strip and matched in position with the camera sensor assembly. The backlight assembly includes: The crossbeam has two end faces that are detachably threaded to the inside of the frame; The U-shaped bracket includes a base plate and side plates extending vertically upward from both sides of the base plate in the width direction. The base plate is detachably threaded to the crossbeam, and the top surface of the side plates extends outward in the horizontal direction with a mounting plate. A white backlight is detachably threaded into the U-shaped groove of the U-shaped bracket, and the height of the white backlight is less than the depth of the U-shaped groove. A light-transmitting color plate is positioned and abuts against the mounting plate.

[0007] Preferably, the lens of the camera sensor assembly is provided with a narrow bandpass filter that matches the light-transmitting color plate.

[0008] Preferably, the camera sensor assembly is covered by an anti-interference box, which is mounted on the frame and has a completely open bottom surface.

[0009] Preferably, the bottom of the anti-interference box is provided with a snap-fit ​​groove that abuts against the top surface of the frame, and a connecting plate that is threadedly connected to the side of the frame.

[0010] Preferably, the anti-interference box is provided with hinged doors on the front and rear sides.

[0011] Preferably, the hinge door is connected to the anti-interference box body via a magnetic attraction component, allowing it to be opened and closed.

[0012] Preferably, the magnetic attraction assembly includes a magnet fixedly disposed inside the anti-interference box and a magnetic attractor that matches the magnet fixedly disposed inside the hinge door.

[0013] Preferably, the top surface of the mounting plate of the U-shaped bracket has an array of several limiting posts, and the light-transmitting color plate is provided with through holes that match the limiting posts. When connected, the through holes are fitted with the limiting posts for limiting.

[0014] Preferably, the limiting post is a screw stud, and the screw is threadedly connected to the mounting plate.

[0015] Compared with the prior art, the online punching detection device for rolled strip of this application has the following advantages: 1. Effectively suppresses ambient light interference and significantly improves detection reliability: The core improvement of this invention lies in constructing a controlled optical detection environment. The light-transmitting color plate first converts the full spectrum of the white background light into a specific color of "quasi-monochromatic light," initially filtering out unnecessary spectral components. The narrow-band pass filter then, based on this, only allows light in a narrow band that highly matches the center wavelength of this quasi-monochromatic light to pass through, thus effectively filtering out reflected bright spots and stray light formed on the surface of the metal rolling strip by ambient light such as fluorescent lights from the workshop ceiling. This results in the image captured by the camera showing a darker and cleaner strip body area, while the signal light transmitted through the holes is clear and bright, fundamentally solving the problem of false identification caused by reflective interference and significantly reducing the system's false alarm rate.

[0016] 2. Enhanced image signal-to-noise ratio and contrast, improving recognition accuracy: The aforementioned optical filtering system significantly improves the image's signal-to-noise ratio. The contrast between the hole features (signal light) and the material strip background (ambient reflected light) is enhanced. The camera sensor can more accurately and stably capture the features of each hole, thereby ensuring the accuracy and stability of the punch hole recognition algorithm and providing a guarantee for reliable production quality control.

[0017] 3. The structure is stable and easy to maintain, improving the practicality of the equipment: (1) Modular design of backlight assembly: The backlight assembly is mounted on the frame via a crossbeam and a U-shaped bracket, and the white backlight and the light-transmitting color plate are detachable. This modular design is not only convenient to install and accurate in positioning, but also makes maintenance simple and efficient when different colors of light-transmitting color plates need to be replaced, reducing equipment downtime.

[0018] (2) Precise positioning of the light-transmitting color plate: The limiting sleeve structure of the limiting post and the through hole ensures that the position of the light-transmitting color plate on the mounting plate is fixed, avoiding uneven light source or reduced filtering effect due to position offset, and ensuring the consistency of detection conditions.

[0019] (3) Camera sensor protection and maintenance convenience: The anti-interference box provides a physical shielding layer for the camera sensor assembly, further blocking interference from ambient light and providing a certain degree of dust protection. At the same time, its magnetic hinge door ensures the airtightness of the box and makes opening and closing extremely convenient, facilitating daily cleaning, debugging and maintenance of the camera sensor.

[0020] In summary, this utility model, through targeted optical system design and user-friendly mechanical structure design, improves detection accuracy and reliability while ensuring continuous equipment operation and ease of maintenance, thereby enhancing the overall automation level and production efficiency of the production line. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the backlight assembly in an embodiment of the present invention; Figure 3 This is an exploded view of the backlight assembly in an embodiment of this utility model; Figure 4 This is a schematic diagram of the installation structure of the anti-interference box in an embodiment of this utility model; Figure 5 This is a schematic diagram of the anti-interference box in an embodiment of the present invention; Figure 6This is a schematic diagram of the anti-interference box when the hinge door is opened in an embodiment of this utility model; Figure 7 This is a diagram showing the working state of the anti-interference box when the hinge door is opened in an embodiment of this utility model. Figure 8 This is a schematic diagram of the narrow bandpass filter structure in an embodiment of the present invention.

[0022] Reference numerals: 100, frame; 200, conveyor; 300, camera sensor assembly; 310, narrow bandpass filter; 320, anti-interference box; 321, snap-fit ​​slot; 322, connecting plate; 330, hinge door; 341, magnet; 342, magnetic suction; 400, backlight assembly; 410, crossbeam; 420, U-shaped bracket; 421, base plate; 422, side plate; 423, mounting plate; 424, limiting post; 430, white backlight; 440, light-transmitting color plate; 441, through hole. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Example

[0024] like Figure 1-8 As shown, this embodiment provides an online missing punch detector for rolled metal strips, mainly used to detect whether punches are missing on highly reflective rolled metal strips. The detector includes a frame 100, a conveying device 200 for conveying the rolled metal strip, a camera sensor assembly 300 disposed above the rolled metal strip, and a backlight assembly 400 disposed below the rolled metal strip and positioned directly opposite the camera sensor assembly 300.

[0025] The frame 100 provides support for the entire detection system. The backlight assembly 400 includes a crossbeam 410, a U-shaped bracket 420, a white backlight 430, and a light-transmitting color plate 440.

[0026] Specifically, the two end faces of the crossbeam 410 are detachably fixed to the mounting positions inside the frame 100 by bolts. The U-shaped bracket 420 includes a base plate 421 and side plates 422 extending vertically upward integrally from both sides of the base plate 421 in the width direction. The base plate 421 is detachably fixed to the top surface of the crossbeam 410 by bolts. The top surfaces of both side plates 422 extend outward in the horizontal direction to form mounting plates 423.

[0027] The white backlight 430 is mounted on the base plate 421 of the U-shaped bracket 420 by screws and is located within the U-shaped groove formed by the base plate 421 and the two side plates 422. The height of the emitting surface of the white backlight 430 is lower than the top of the side plate 422, that is, its height is less than the depth of the U-shaped groove. The light-transmitting color plate 440 is placed horizontally, and its edges are positioned to abut against the mounting plates 423 on both sides of the U-shaped bracket 420.

[0028] In a preferred embodiment, to achieve rapid and accurate positioning and replacement of the light-transmitting color plate 440, the top surface of the mounting plate 423 of the U-shaped bracket 420 is arrayed with several limiting posts 424. Correspondingly, the light-transmitting color plate 440 has through holes 441 corresponding to these limiting posts 424. During installation, the through holes 441 of the light-transmitting color plate 440 are aligned and the limiting posts 424 are inserted to achieve accurate positioning and prevent displacement during operation. Furthermore, the limiting posts 424 are the stud portion of screws, formed by screwing screws into pre-drilled threaded holes on the mounting plate 423, resulting in a simple structure and low manufacturing cost.

[0029] As a key improvement in this embodiment, the light-transmitting color plate 440 is preferably a red light-transmitting color plate. This red color plate is made of red acrylic sheet with high light transmittance and high color saturation. Its function is that when the full-spectrum white light emitted by the white backlight 430 passes through it, the color plate absorbs most of the blue and green light bands, mainly transmitting red light with a center wavelength around 630nm, thereby creating a uniform red backlight environment below the rolled material strip. This is a preliminary, coarse-grained optical filtering.

[0030] Accordingly, a narrow-bandpass filter 310 matching the red light-transmitting color plate 440 is mounted on the front end of the lens of the camera sensor assembly 300. This narrow-bandpass filter 310 has a center transmission wavelength of 630 nm and a bandwidth of ±30 nm. Its function is to perform a second step of fine optical filtering, allowing only red light in a narrow band around 630 nm (i.e., 600 nm to 660 nm) to pass through, while strongly blocking all other wavelengths of light outside this range.

[0031] The principle and effect of this optical system working together are as follows: the light emitted by the white background lamp 430 is filtered by the red light-transmitting plate 440 to form "quasi-monochromatic" red light. This red light passes through the holes on the rolled strip, and most of its main energy falls within the transmission range of the narrow bandpass filter 310, allowing it to enter the camera smoothly and form bright hole features in the image. Meanwhile, stray light from overhead fluorescent lights and other sources in the workshop environment shines on the surface of the metal strip and is reflected. However, most of this reflected light (such as green light around 550nm) is effectively blocked because its wavelength is outside the passband of the filter and cannot reach the camera sensor. Ultimately, in the image captured by the camera, the rolled strip body area appears very dark and clean due to the filtering out of reflected light, forming a very high contrast with the bright red light spots at the holes, thus completely eliminating reflective interference and enabling the system to stably and accurately identify punching defects. Since the addition of color plates and filters will result in the loss of some light energy, in practice, the brightness of the white backlight 430 can be appropriately increased and the exposure time of the camera sensor assembly 300 can be increased accordingly to compensate for this loss.

[0032] To protect the camera sensor assembly 300 and further isolate it from environmental interference, an anti-interference box 320 is provided as its outer cover. The anti-interference box 320 is positioned by abutting against the top edge of the frame 100 through a snap-fit ​​groove 321 at its bottom, and is also fixed to the side of the frame 100 with bolts through a connecting plate 322 on its side, ensuring a stable installation. The bottom surface of the anti-interference box 320 is completely open to ensure an unobstructed view of the camera. Hinged doors 330 are installed on both the front and rear sides of the anti-interference box 320 via hinges. The hinged doors 330 are connected to the box body by a magnetic attraction assembly; the magnetic attraction assembly includes a magnet 341 fixed to the inside of the anti-interference box 320 and a magnetic suction element 342 (such as an iron sheet) fixed to the inside of the hinged door 330. When the door is closed, it is tightly closed by magnetic attraction, and when the door is opened, only a certain pulling force is required to open it, which facilitates the daily cleaning, adjustment and maintenance of the camera sensor assembly 300.

[0033] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An online punching defect detector for rolled strip, characterized in that: It includes a frame, a conveying device for conveying the rolling material belt, a camera sensor assembly positioned above the rolling material belt, and a backlight assembly positioned below the rolling material belt and matching the position of the camera sensor assembly; The backlight assembly includes: The crossbeam has two end faces that are detachably threaded to the inside of the frame; The U-shaped bracket includes a base plate and side plates extending vertically upward from both sides of the base plate in the width direction. The base plate is detachably threaded to the crossbeam, and the top surface of the side plates extends outward in the horizontal direction with a mounting plate. A white backlight is detachably threaded into the U-shaped groove of the U-shaped bracket, and the height of the white backlight is less than the depth of the U-shaped groove. A light-transmitting color plate is positioned and abuts against the mounting plate.

2. The online punching defect detector for rolled strip according to claim 1, characterized in that: The lens of the camera sensor assembly is equipped with a narrow bandpass filter that matches the light-transmitting color plate.

3. The online punching defect detector for rolled strip according to claim 1, characterized in that: The camera sensor assembly is covered by an anti-interference box, which is mounted on the frame and has a completely open bottom surface.

4. The online punching defect detector for rolled strip according to claim 3, characterized in that: The bottom of the anti-interference box is provided with a snap-fit ​​groove that abuts against the top surface of the frame, and a connecting plate that is threadedly connected to the side of the frame.

5. The online punching defect detector for rolled strip according to claim 3, characterized in that: The anti-interference box is equipped with hinged doors on its front and rear sides.

6. The online punching defect detector for rolled strip according to claim 5, characterized in that: The hinge door is connected to the anti-interference box body via a magnetic attraction component, allowing it to be opened and closed.

7. The online punching defect detector for rolled strip according to claim 6, characterized in that: The magnetic attraction assembly includes a magnet fixedly disposed inside the anti-interference box and a magnetic attraction component that matches the magnet fixedly disposed inside the hinge door.

8. The online punching defect detector for rolled strip according to claim 1, characterized in that: The mounting plate of the U-shaped bracket has a number of limiting posts on its top surface, and the light-transmitting color plate has through holes that match the limiting posts. When connected, the through holes are fitted with the limiting posts for limiting.

9. The online punching defect detector for rolled strip according to claim 8, characterized in that: The limiting post is a stud of a screw, and the screw is threadedly connected to the mounting plate.

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