Appearance detection system for medium-branch moisture retention bag

Abstract

The utility model discloses an appearance detection system for a middle-branch moisture-retaining bag, which has the main design conception that six cameras aiming at the appearance of a small bag are configured, and two belts with an interval are used for horizontally conveying the cigarette bag, so that the bottom of the cigarette bag is exposed to the maximum extent, and six-surface detection of the small bag is realized; through multi-angle dome illumination light supplement, uniform light supplement for the moisture retention bag is realized, and the detection accuracy of fine defects is improved; in addition, the rotating speed of the sub-packaging device and the sub-packaging motor can be adjusted so as to adapt to different requirements and production speeds, it can be effectively guaranteed that only a single packaged cigarette is shot each time, and the sub-packaging device can evenly sub-package the cigarette packets while it is guaranteed that the cigarette packets are not excessively extruded. Therefore, the effects of flat cigarette packet conveying and six-surface visual reliable imaging detection are achieved.

Description

Technical Field

[0001] The utility model relates to the field of cigarette manufacturing, in particular to an appearance detection system for medium-sized moisturizing packs. Background Art

[0002] In recent years, visual inspection technology has been widely used in cigarette manufacturing to improve product process control capabilities and further promote high-quality manufacturing. This is particularly true for inspecting finished small cigarette packs. Small pack appearance inspection devices are typically installed at the exit channel of small pack packaging machines, utilizing the original machine's cigarette pack transport channel.

[0003] To elaborate, the existing visual imaging inspection of finished cigarettes, collectively referred to as small package appearance inspection in the industry, mainly involves photographing and inspecting finished small packages that have been packaged in small boxes with trademark paper. The specific method is to install an imaging inspection system on the cigarette package conveyor channel at the exit of the small box packaging machine. When the equipment is running, the cigarette packages stand on their side on the conveyor belt, which conveys the cigarette packages sideways through friction. The Baorun Pack appearance inspection takes photos of the upper side, front large surface, back large surface, left bottom surface, and right bottom surface of the small box cigarette packages conveyed sideways (the lower side is in contact with the conveyor belt and cannot be inspected). That is, the existing technology mainly inspects cigarette packs standing on their sides, and the inspection surfaces are five sides. There is no solution for the appearance inspection of all six sides of the moisturizing packs. Furthermore, in the currently used visual inspection solutions, the lighting mechanism that improves the clarity of the photos will lead to uneven exposure, and thus the ideal imaging effect cannot be obtained. In addition, before the cigarette packs enter the inspection device, they are usually divided into packages by clamping the cigarette packs with two upright conveyor belts. Since the packaging material of the moisturizing packs is relatively soft, this method of using belts to clamp and convey may cause the cigarette packs to deform, affecting product quality.

[0004] The summary is as follows:

[0005] (1) The existing appearance inspection of moisturizing packs only inspects five sides. The width of the conveyor belt is greater than the width of the cigarette pack, and the lower side is in contact with the conveyor belt. If quality defects occur on the lower side of the cigarette pack, the existing appearance inspection scheme for moisturizing packs cannot reliably detect them.

[0006] (2) The existing appearance inspection of moisturizing packs uses a strip light source for lighting, and the LED light source irradiates from the same direction, which often causes part of the collected cigarette pack image to be overexposed and the other part to be underexposed, thereby affecting the detection accuracy.

[0007] (3) Before the cigarette packs enter the detection device, they are divided into packages by clamping them with a vertical conveyor belt, which will deform the cigarette packs and affect product quality. Utility Model Content

[0008] In view of the above, the present invention aims to provide a system for inspecting the appearance of medium-sized lubricant bags to solve the aforementioned technical problems.

[0009] The technical solutions adopted in this utility model are as follows:

[0010] The utility model provides a system for inspecting the appearance of a medium-sized lubricant bag, which includes:

[0011] Subcontracting trigger optical fiber, photo trigger optical fiber, rejection trigger optical fiber, outlet blockage detection optical fiber, subcontracting device, subcontracting motor, front fill light device, front detection camera, rear fill light device, rear detection camera, upper fill light device, upper detection camera, lower fill light device, lower detection camera, upper left detection camera, upper right detection camera, rejection device and conveyor belt;

[0012] The conveyor belt is composed of two belts arranged horizontally and in parallel, used to horizontally support the largest side of the cigarette pack, and the two belts have a preset distance;

[0013] The subpackaging trigger optical fiber, the photographing trigger optical fiber, the rejection trigger optical fiber, and the outlet blockage detection optical fiber are arranged in sequence according to the conveying direction and are installed in the middle channel of the two belts through a fixed bracket in an up-down beaming mode;

[0014] The subpackaging motor is connected to the subpackaging device via a pulley and a toothed belt to provide subpackaging power for the subpackaging device, and the subpackaging device is used to separate adjacent cigarette packs being transported by a predetermined distance;

[0015] The front fill light device, the rear fill light device, the upper fill light device, and the lower fill light device correspond to the four sides of the cigarette pack, respectively, and are installed around the conveyor belt behind the subpackaging device according to the conveying direction;

[0016] The six detection cameras are respectively arranged corresponding to the six sides of the cigarette pack, and the front detection camera, the rear detection camera, the upper detection camera, and the lower detection camera are respectively connected to the front fill light device, the rear fill light device, the upper fill light device, and the lower fill light device;

[0017] The rejection device is installed behind the detection camera according to the conveying direction;

[0018] The subpackaging trigger optical fiber, the photographing trigger optical fiber, the rejection trigger optical fiber and the outlet blockage detection optical fiber are respectively associated with the electrical signals of each fill light device, each detection camera, the subpackaging motor and the rejection device.

[0019] In at least one possible implementation, each fill light device has a bowl-shaped semicircular structure, specifically comprising: a circular fill light cover and a ring-shaped LED light facing the inner wall of the circular fill light cover;

[0020] The inner wall surface of the circular fill light cover is set to a white frosted rough surface, which is used to form diffuse reflection inside the entire fill light device.

[0021] In at least one possible implementation, the distance between the center axes of the two conveyor belts is equal to half the length of the long side of the cigarette pack.

[0022] In at least one possible implementation, the cigarette packing motor has a variable speed and / or direction function, which is used to change the passing speed of the cigarette packs.

[0023] In at least one possible implementation, the detection system further includes a trigger board, and the subcontracting trigger optical fiber, the photographing trigger optical fiber, the rejection trigger optical fiber, and the outlet blockage detection optical fiber are respectively signal-connected to the trigger board;

[0024] The trigger board has at least three signal transmission paths:

[0025] The first path is connected to each detection camera and each fill light device;

[0026] The second channel is connected to the host computer signal through the I / O interface board;

[0027] The third route is connected to the PLC and is used to control the actions of the conveyor belt, the rejecting device, and the subcontracting motor.

[0028] In at least one possible implementation manner, the host computer is electrically connected to the PLC and each detection camera respectively.

[0029] In at least one possible implementation, the reject device includes a reject solenoid valve, a reject cylinder, and a reject nozzle, and the reject solenoid valve is connected to the PLC electrical signal.

[0030] In at least one possible implementation manner, strip-shaped fill lights are respectively provided below the upper left detection camera and the upper right detection camera.

[0031] In at least one possible implementation, the detection system further includes two semi-arc-shaped mounting brackets, each of which is used to mount three detection cameras.

[0032] Compared with the existing technology, the main design concept of this utility model is that it is equipped with six cameras tailored to the appearance of small packages, and uses two belts with spacing to convey cigarette packages horizontally, maximizing the exposure of the bottom of the cigarette packages and achieving six-sided inspection of the small packages. In addition, through multi-angle dome lighting, uniform fill light is achieved for the moisturizing packages, which is conducive to improving the accuracy of detecting subtle defects. In addition, the provided sub-packaging device and sub-packaging motor can adjust the speed to adapt to different needs and production speeds, which can effectively ensure that only a single cigarette package is photographed at a time. The sub-packaging device can ensure that the cigarette packages are not over-squeezed while also evenly packing the cigarette packages. As a result, the utility model achieves the effect of flat-pack conveying cigarette packages and completing six-sided visual reliable imaging inspection.

[0033] Furthermore, the present invention uses a trigger board to realize multi-path branching of the control signal, and the signal is not processed by the PLC, which can minimize the trigger delay and provide more sufficient time for defect identification and shift elimination processing.

[0034] Furthermore, the I / O interface board of the present invention can convert the 24V control signal sent by the trigger board into a 5V or 12V signal that can be recognized by the host computer, thereby realizing effective information interaction between the control system and the host computer IO signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0036] Figure 1 A hardware diagram of the appearance inspection system for medium-sized moisturizing bags provided by an embodiment of the present invention;

[0037] Figure 2 This is an electrical block diagram of the appearance inspection system for the medium-sized lubricant bag provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0038] The following describes in detail embodiments of the present invention. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0039] The present invention proposes an embodiment of a system for inspecting the appearance of a medium-sized lubricant bag. Specifically, Figure 1As shown, it includes: a subcontracting trigger optical fiber 1, a photo triggering optical fiber 2, a rejection triggering optical fiber 3, an outlet blockage detection optical fiber 4, a subcontracting device 5, a subcontracting motor 6, a front fill light device 7, a front detection camera 8, a rear fill light device 9, a rear detection camera 10, an upper fill light device 11, an upper detection camera 12, a lower fill light device 13, a lower detection camera 14, an upper left detection camera 15, an upper right detection camera 16, a rejection device 18 and a conveyor belt 19;

[0040] The conveyor belt 19 can be composed of two 10mm wide rubber belts arranged horizontally and parallel to each other, used to horizontally support the largest side of the cigarette pack, with the two belts having a predetermined spacing. Preferably, the spacing between the two belts is adjustable. For example, the two belts respectively contact the left and right quarters of the lower side of the cigarette pack. This ensures stable conveyance of the cigarette pack while allowing the corners and most of the lower side of the cigarette pack to escape, thereby minimizing the obstruction of the lower side of the cigarette pack by the belts.

[0041] The subpackaging trigger optical fiber 1, the photographing trigger optical fiber 2, the rejection trigger optical fiber 3, and the outlet blockage detection optical fiber 4 are arranged in sequence according to the conveying direction shown in the figure. Specifically, the subpackaging trigger optical fiber 1 can be arranged at a preset distance in front of the subpackaging device 5, the photographing trigger optical fiber 2 can be arranged behind the subpackaging device 5 and close to the camera area, the rejection trigger optical fiber 3 can be arranged at the conveying channel behind the photographing area (the established rejection position), and the outlet blockage detection optical fiber 4 can be arranged at the end outlet of the conveyor belt 19. In actual operation, the above four groups of optical fibers can be installed in the middle channel of the two conveyor belts 19 by fixing brackets, and adopt an up-and-down shooting mode. More preferably, a convex lens is installed on the optical fiber probe to focus the infrared light emitted by the optical fiber to a spot diameter of less than 6mm, so that the position deviation of the cigarette package is less than 2mm each time it is triggered.

[0042] Next, the sub-packaging device 5 is installed on the moisturizing pack appearance inspection base (not shown in the figure). When the moisturizing pack reaches the sub-packaging device 5, the sub-packaging device will separate the continuously transported cigarette packs by a predetermined distance, thereby ensuring that only a single pack of cigarettes is photographed each time during subsequent photo inspection, avoiding interference caused by the front and rear cigarette packs.

[0043] The subpackaging motor 6 is connected to the subpackaging device through a pulley and a toothed belt, providing subpackaging power to the subpackaging device 5 and regulating the subpackaging effect through the motor speed. Specifically, the subpackaging device 5 may include a clamping mechanism, and through the speed and steering control of the subpackaging motor 6, the effects of relaxed clamping and rapid release can be achieved, which not only avoids damage to the cigarette packs, but also ensures the efficiency of continuous detection. In other embodiments, as shown in the figure, the subpackaging device 5 can be a roller group located on the side of the conveyed cigarette packs. The roller group driven by the subpackaging motor is in frictional contact with multiple side surfaces of the cigarette packs to achieve the effect of changing the conveying speed of the cigarette packs, so as to achieve the purpose of separating adjacent cigarette packs at a certain distance. For example, the rotation speed of the roller group is significantly lower than the speed of the conveying belt, so that the cigarette packs passing therethrough are decelerated.

[0044] Continuing from the above, the front fill light device 7, the rear fill light device 9, the upper fill light device 11, and the lower fill light device 13 correspond to the front, rear, upper, and lower sides of the cigarette pack, respectively, and are installed on the conveyor belt 19 behind the subpackaging device 5 according to the conveying direction;

[0045] The above-mentioned fill light device has a bowl-shaped semicircular structure, and may specifically include a circular fill light cover and a circular LED light facing the circular fill light cover. The light emitted by the LED does not directly illuminate the cigarette pack, but illuminates the circular fill light cover and is reflected back through the fill light cover. More preferably, the inner reflective surface of the circular fill light cover is a white frosted rough surface, and the light is irradiated on it to form diffuse reflection, and uniform light is spread throughout the interior of the fill light device, thereby uniformly filling light on the entire plane of the cigarette pack.

[0046] The front detection camera 8, the rear detection camera 10, the upper detection camera 12, the lower detection camera 14, the upper left detection camera 15, and the upper right detection camera 16 are respectively arranged corresponding to the six sides of the cigarette pack, and the front detection camera 8, the rear detection camera 10, the upper detection camera 12, and the lower detection camera 14 are respectively connected to the front fill light device 7, the rear fill light device 9, the upper fill light device 11, and the lower fill light device 13. For example, a camera passage hole is provided at the top of the bowl-shaped semicircular fill light cover, which is not limited by the present invention. It can be explained that since the upper left detection camera 15 and the upper right detection camera 16 are located on the detection channel and it is inconvenient to install the aforementioned fill light device in space, in other preferred embodiments of the present invention, strip-shaped fill lights can be added to the lower parts of the two cameras of the upper left detection camera and the upper right detection camera according to the needs of on-site imaging, so as to realize fill light for the left front and right front sides of the cigarette pack.

[0047] It can also be explained that the installation method of the aforementioned cameras can be achieved through a semi-arc-shaped mounting bracket 17. For example, the mounting bracket 17 can be fixed to the small package appearance inspection base (not shown in the figure) through a screw, and as shown in the figure, three cameras can be installed on each mounting bracket 17 (the other mounting bracket 17 is not shown).

[0048] The rejection device 18 is installed behind the camera according to the conveying direction. Specifically, it can be composed of a rejection solenoid valve, a rejection cylinder, and a rejection nozzle. When the cigarette package is judged to be defective and reaches the rejection position, the rejection device 18 is triggered to reject the defective cigarette package on the channel.

[0049] The subpackaging trigger optical fiber 1, the photographing trigger optical fiber 2, the rejection trigger optical fiber 3 and the outlet blockage detection optical fiber 4 are respectively associated with the electrical signals of each fill light device, each detection camera, the subpackaging motor and the rejection device.

[0050] Here we provide Figure 2 The following is an example of an electrical connection block diagram of a medium-sized lubricant bag appearance inspection system (illustrative of one implementation only, not limiting). The signals detected by trigger fiber 1, photo trigger fiber 2, rejection trigger fiber 3, and outlet blockage detection fiber 4 are transmitted to a trigger board (which can be understood as a signal conversion and distribution circuit module), which then divides the signals into three paths:

[0051] The first channel directly transmits power to all cameras and fill-light devices. While controlling the fill-light devices to receive power, it also triggers the cameras to take photos, thus reducing the trigger delay between taking photos and fill-light, ensuring that fill-light and taking photos are synchronized. The trigger signal for taking photos is converted to 12V by the trigger board, while the voltage for the fill-light is 24V.

[0052] In the second path, the trigger board forwards the signal to the I / O interface board, which processes the signal into a 5V or 12V signal that can be received by the host computer and transmits it to the host computer. The host computer completes the trigger counting, fault detection and other processing.

[0053] The third path is that the trigger board transmits the signal directly to the PLC (such as Beckhoff) for controlling the conveyor belt, rejection device, and subcontracting motor.

[0054] Moreover, in the above Figure 2 Based on the schematic electrical framework, the host computer can be connected to the PLC and the electrical signals of each detection camera respectively. In actual operation, the detection camera and the host computer can be connected via Ethernet, and the PLC and the host computer can be connected via TwinCAT3 network cable.

[0055] Based on this electrical framework, functions such as parameter downloading and photo uploading can be realized between the detection camera and the host computer. For example, the detection camera can take a photo of the cigarette package and transmit the cigarette package image to the host computer. The host computer performs defect detection through a preset appearance image detection algorithm. When defects are detected in the current cigarette package image, an NG signal can be sent to the PLC through the network cable; after receiving the cigarette package defect signal, the PLC can control the rejection solenoid valve to be energized, and then control the action of the rejection cylinder to reject the corresponding cigarette package.

[0056] In summary, the main design concept of this utility model is to configure six cameras for the appearance of small packages, and use two belts with a certain distance between them to convey cigarette packages horizontally, so as to expose the bottom of the cigarette packages to the maximum extent and realize six-sided inspection of small packages; and through multi-angle dome lighting fill light, uniform fill light is achieved for the moisturizing packages, which is conducive to improving the accuracy of detection of subtle defects; in addition, the provided sub-packaging device and sub-packaging motor can adjust the speed to adapt to different needs and production speeds, which can effectively ensure that only a single cigarette package is photographed each time, and the sub-packaging device can ensure that the cigarette packages are not over-squeezed while being able to evenly pack the cigarette packages. As a result, the utility model achieves the effect of flat-pack conveying cigarette packages and completing six-sided visual reliable imaging inspection.

[0057] If the expressions of direction are mentioned in the embodiments of the present invention, they are relative concepts based on the embodiments. In addition, "at least one" refers to one or more, and "more" refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can represent: a, b, c, a and b, a and c, b and c or a, b and c, where a, b, c can be single or multiple.

[0058] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings, but the above is only a preferred embodiment of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred methods can be reasonably combined and matched into a variety of equivalent schemes by those skilled in the art without departing from or changing the design ideas and technical effects of the present invention; therefore, the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present invention.

Claims

1. A system for inspecting the appearance of a medium-sized lubricant bag, characterized in that: include: Subcontracting trigger optical fiber, photo trigger optical fiber, rejection trigger optical fiber, outlet blockage detection optical fiber, subcontracting device, subcontracting motor, front fill light device, front detection camera, rear fill light device, rear detection camera, upper fill light device, upper detection camera, lower fill light device, lower detection camera, upper left detection camera, upper right detection camera, rejection device and conveyor belt; The conveyor belt is composed of two belts arranged horizontally and in parallel, used to horizontally support the largest side of the cigarette pack, and the two belts have a preset distance; The subpackaging trigger optical fiber, the photographing trigger optical fiber, the rejection trigger optical fiber, and the outlet blockage detection optical fiber are arranged in sequence according to the conveying direction and are installed in the middle channel of the two belts through a fixed bracket in an up-down beaming mode; The subpackaging motor is connected to the subpackaging device via a pulley and a toothed belt to provide subpackaging power for the subpackaging device, and the subpackaging device is used to separate adjacent cigarette packs being transported by a predetermined distance; The front fill light device, the rear fill light device, the upper fill light device, and the lower fill light device correspond to the four sides of the cigarette pack, respectively, and are installed around the conveyor belt behind the subpackaging device according to the conveying direction; The six detection cameras are respectively arranged corresponding to the six sides of the cigarette pack, and the front detection camera, the rear detection camera, the upper detection camera, and the lower detection camera are respectively connected to the front fill light device, the rear fill light device, the upper fill light device, and the lower fill light device; The rejection device is installed behind the detection camera according to the conveying direction; The subpackaging trigger optical fiber, the photographing trigger optical fiber, the rejection trigger optical fiber and the outlet blockage detection optical fiber are respectively associated with the electrical signals of each fill light device, each detection camera, the subpackaging motor and the rejection device.

2. The appearance inspection system for Zhongzhi Baoluan according to claim 1 is characterized in that: Each fill light device has a bowl-shaped semicircular structure, specifically comprising: a circular fill light cover and a ring-shaped LED light facing the inner wall of the circular fill light cover; The inner wall surface of the circular fill light cover is set to a white frosted rough surface, which is used to form diffuse reflection inside the entire fill light device.

3. The appearance inspection system for Zhongzhi Baoluan according to claim 1 is characterized in that: The distance between the two belt center axes of the conveyor belt is equal to half the length of the long side of the cigarette pack.

4. The appearance inspection system for Zhongzhi Baoluan according to claim 1 is characterized in that: The cigarette packing motor has a variable speed and / or direction function, which is used to change the passing speed of the cigarette packs.

5. The appearance inspection system for Zhongzhi Baoluan according to claim 1 is characterized in that: The detection system further includes a trigger board, and the subpackaging trigger optical fiber, the photographing trigger optical fiber, the rejection trigger optical fiber, and the outlet blockage detection optical fiber are respectively connected to the trigger board by signal; The trigger board has at least three signal transmission paths: The first path is connected to each detection camera and each fill light device; The second channel is connected to the host computer signal through the I / O interface board; The third route is connected to the PLC and is used to control the actions of the conveyor belt, the rejecting device, and the subcontracting motor.

6. The appearance inspection system for Zhongzhi Baoluan according to claim 5 is characterized in that: The host computer is respectively connected to the PLC and each detection camera by electrical signals.

7. The appearance inspection system for Zhongzhi Baoluan according to claim 5 is characterized in that: The rejecting device includes a rejecting solenoid valve, a rejecting cylinder and a rejecting nozzle, and the rejecting solenoid valve is connected to the PLC electrical signal.

8. The appearance inspection system for Zhongzhi moisturizing bag according to any one of claims 1 to 7, characterized in that: Strip-shaped fill lights are respectively provided at the lower parts of the upper left detection camera and the upper right detection camera.

9. The appearance inspection system for Zhongzhi moisturizing bag according to any one of claims 1 to 7, characterized in that: The detection system further comprises two semi-arc-shaped mounting brackets, each of which is used to mount three detection cameras.

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