Aluminum foil sheet missing detection device

Abstract

This invention relates to the field of cigarette packaging quality inspection technology, and particularly to a device for detecting missing aluminum foil pull tabs. The device includes: a detection frame with a detection space, the detection space being a frame structure that allows cigarette packs with aluminum foil pull tabs to stop or pass through; a first detection unit including a first sensor and a first detection head connected to the first sensor, the first detection head being disposed on the detection frame and used to detect aluminum foil pull tabs on the side of the cigarette pack; a second detection unit including a second sensor and a second detection head connected to the second sensor, the second detection head being disposed on the detection frame and used to detect aluminum foil pull tabs at the bottom of the cigarette pack; and a power supply module connected to both the first and second sensors, providing them with operating voltage; the signal output terminals of the first and second sensors are connected in series via a signal line, and the series-connected signal output terminal is connected to a packaging machine. This solution is used to achieve accurate detection of missing aluminum foil pull tabs, improving the quality control level of cigarette packaging.

Description

Technical Field

[0001] This invention relates to the field of cigarette packaging quality inspection technology, and in particular to a device for detecting missing aluminum foil paper strips. Background Technology

[0002] In the cigarette manufacturing industry, hard-pack packaging equipment is a crucial link in ensuring product quality and production efficiency. The ZB45 hard-pack packaging unit, widely used in the Chinese tobacco industry, achieves a production capacity of 400 packs per minute based on the MICRO-II electronic control system, providing vital support for the large-scale production of flip-top hard-pack cigarettes. With the development of the tobacco industry, the market demand for specialty cigarettes such as slim and medium-sized cigarettes is increasing. Various cigarette factories have modified the ZB45 standard cigarette packaging unit to create specialized units adapted to different specifications, thus meeting diverse production needs.

[0003] However, with the continuous upgrading of raw and auxiliary materials and design innovation, the materials and patterns of aluminum foil used in cigarette packaging are showing a diversified development trend. Traditional aluminum foil pull tab detection devices are designed based on the reflective properties of bright, solid-color aluminum foil. They detect the position of the pull tab through a photoelectric tube. The working principle is to utilize the sealed structure formed by folding the aluminum foil. When the pull tab is missing or the inner lining paper is not folded properly, the device triggers a shutdown alarm by identifying the exposed state of the cigarette filter tip.

[0004] However, for ultra-slim cigarette packs, the altered arrangement of the cigarettes increases the area covered by the aluminum foil, allowing the foil to still wrap the cigarettes even if the pull tab is missing, thus rendering the detection system ineffective. This problem directly leads to substandard products entering the market, harming not only consumer interests but also negatively impacting economic benefits. Summary of the Invention

[0005] This invention provides an aluminum foil pull tab missing detection device to solve the defects of existing detection systems for ultra-fine cigarette packs, which are prone to false detection, missed detection, and even detection failure due to the increased coverage area of ​​aluminum foil. The device enables accurate detection of missing aluminum foil pull tabs and improves the quality control level of cigarette packaging.

[0006] This invention provides a device for detecting missing aluminum foil pull tabs, comprising: a detection frame with a detection space, the detection space being a frame structure that allows cigarette packs with aluminum foil pull tabs to stop or pass through; a first detection unit including a first sensor and a first detection head signal-connected to the first sensor, the first detection head being disposed on the detection frame for detecting aluminum foil pull tabs on the side of the cigarette pack; a second detection unit including a second sensor and a second detection head signal-connected to the second sensor, the second detection head being disposed on the detection frame for detecting aluminum foil pull tabs at the bottom of the cigarette pack; and a power supply module connected to the first sensor and the second sensor respectively, providing them with operating voltage; the signal output terminals of the first sensor and the second sensor are connected in series via signal lines, and the series-connected signal output terminals are connected to a packaging machine.

[0007] According to one embodiment of the present invention, the detection frame includes a plurality of detachable frame modules; wherein at least one of the frame modules is provided with a detection hole for inserting the first detection head and / or the second detection head.

[0008] According to one embodiment of the present invention, a stepped positioning surface is provided between the frame modules; the stepped positioning surface is provided with assembly holes for fixed connection between the frame modules.

[0009] According to one embodiment of the present invention, the two detection holes for the first detection head and the second detection head are arranged adjacently and are respectively located on two mutually perpendicular structural surfaces of the detection frame to correspond to the side and bottom detection directions of the cigarette pack.

[0010] According to one embodiment of the present invention, both the first detection head and the second detection head are fiber optic sensing heads, and the detection end of the fiber optic sensing head is provided with a dustproof cover.

[0011] According to one embodiment of the present invention, both the first sensor and the second sensor are proximity sensors, and an adjustment knob is provided on the housing of the proximity sensor for changing the detection sensitivity of the sensor.

[0012] According to one embodiment of the present invention, the signal output terminal of the first sensor is connected to the negative terminal of the second sensor via a wire, and the signal output terminal of the second sensor is connected to the signal input point of the control board of the packaging machine via a wire, forming a series detection circuit.

[0013] According to one embodiment of the present invention, the power supply module is a 24V DC power supply; the positive output terminal of the power supply module is connected to the positive terminals of the first sensor and the second sensor respectively through wires; the negative output terminal of the power supply module is connected to the negative terminals of the first sensor and the second sensor respectively through wires, forming a parallel power supply circuit.

[0014] According to one embodiment of the present invention, both the first sensor and the second sensor have built-in infrared modulation light source and digital filtering circuit; the wavelength of the infrared modulation light source is 940nm, and the digital filtering circuit is connected to the signal output terminal of the corresponding sensor.

[0015] According to one embodiment of the present invention, the series-connected signal output terminal is connected to the control board of the packaging machine; the control board is provided with a wiring terminal corresponding to the signal output terminal; the wiring terminal is connected to the control circuit of the packaging machine.

[0016] The aluminum foil pull tab missing detection device provided by this invention provides a suitable detection environment for the passage or stop of cigarette packs by setting up a detection frame with a detection space; it is equipped with a first detection unit and a second detection unit to detect the aluminum foil pull tabs on the side and bottom of the cigarette pack respectively. A power supply module supplies power to the two detection units, and the signal output terminals of the first and second sensors are connected in series to the packaging machine. When either detection unit fails to detect a pull tab, the series circuit is broken, and the packaging machine can be stopped and the defective cigarette packs are rejected. Thus, through a multi-position, series-connected detection design, the limitations of a single detection position are effectively avoided, improving the accuracy and reliability of pull tab missing detection. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is one of the structural schematic diagrams of the aluminum foil paper strip missing detection device provided by the present invention.

[0019] Figure 2 yes Figure 1 A schematic diagram of the central explosion structure.

[0020] Figure 3 The second schematic diagram of the aluminum foil sheet missing detection device provided by the present invention.

[0021] Figure 4 yes Figure 3 A schematic diagram of the central explosion structure.

[0022] Figure 5 This is a schematic diagram of the circuit principle of the aluminum foil sheet missing detection device provided by the present invention.

[0023] Figure label: 10. Inspection frame; 11. First inspection head; 12. Second inspection head; 13. Step positioning surface; 14. Inspection hole; 15. Assembly hole. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0025] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. It should also be noted that in the description of the present invention, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0026] The following is combined Figures 1-5 This invention describes a specific embodiment of the aluminum foil sheet missing detection device.

[0027] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, the present invention provides an aluminum foil pull tab missing detection device, comprising: a detection frame 10, having a detection space, the detection space being a frame structure that allows cigarette packs with aluminum foil pull tabs to stop or pass through; a first detection unit, including a first sensor and a first detection head 11 signal-connected to the first sensor, the first detection head 11 being disposed on the detection frame 10 for detecting aluminum foil pull tabs on the side of the cigarette pack; a second detection unit, including a second sensor and a second detection head 12 signal-connected to the second sensor, the second detection head 12 being disposed on the detection frame 10 for detecting aluminum foil pull tabs at the bottom of the cigarette pack; a power supply module, the power supply module being connected to the first sensor and the second sensor respectively, providing them with operating voltage; the signal output terminals of the first sensor and the second sensor being connected in series via a signal line, the series-connected signal output terminal being connected to a packaging machine.

[0028] Specifically, this aluminum foil pull tab missing detection device achieves accurate identification of missing pull tabs through multi-dimensional collaborative detection. The detection frame 10 serves as the basic support structure, its internal detection space adapted to the cigarette pack conveying path, ensuring the cigarette pack is in the optimal detection position when passing through or briefly stopping. The first and second detection units form a spatially complementary detection combination: the first detection head 11 faces the side of the cigarette pack, focusing on the aluminum foil area corresponding to the lower row of cigarettes, while the second detection head 12 probes upwards from the bottom of the cigarette pack, identifying the aluminum foil coverage status of the cardboard edge. The power supply module provides a stable operating voltage to the two detection units, ensuring their synchronous operation. The series design of the first and second sensors ensures that a complete signal is formed and transmitted to the packaging machine only when both detection units detect the presence of the pull tab; if either detection unit fails to detect the pull tab (e.g., a missing side pull tab or exposed cigarettes at the bottom due to a missing pull tab), the series circuit breaks, triggering the packaging machine's abnormal response mechanism. This avoids the limitations of a single detection angle and improves the reliability of the detection.

[0029] In practical applications, this aluminum foil pull tab missing detection device is deeply integrated with the cigarette pack conveying process of cigarette packaging machines (such as the GDX2 type packaging machine). When the cigarette pack enters the detection area after being folded, the spatial constraint of the detection frame 10 keeps the sides and bottom of the cigarette pack at a preset distance from the detection head. At this time, the first detection head 11 detects the aluminum foil pull tab at the lower cigarette position on the side of the cigarette pack, while the second detection head 12 uses the exposed area of ​​the bottom cardboard edge of the cigarette pack as a reference to identify the presence of aluminum foil at that position. If the pull tab is intact, both detection units output valid signals, the series circuit is connected, the packaging machine determines that the cigarette pack is qualified and continues to convey it; if the pull tab is missing, it may result in no pull tab reflective signal in the side detection area, or an abnormal signal at the bottom due to the cigarette not being completely wrapped. At this time, the series circuit is interrupted, the packaging machine immediately receives the abnormal signal, triggers a shutdown alarm and starts the rejection mechanism to separate the unqualified cigarette pack from the production flow.

[0030] Furthermore, based on the preferred embodiment of this scheme, in terms of hardware configuration, the first detection head 11 and the second detection head 12 preferably adopt fiber optic sensing heads with strong anti-interference capabilities (such as the EH-305 type), which are suitable for the dusty and smoke-filled environment of a cigarette factory and can reduce signal fluctuations caused by environmental interference; the first sensor and the second sensor are proximity sensors (such as the ES-M1 type), whose infrared modulated light source can penetrate smoke and dust, and whose built-in digital filtering algorithm can suppress the influence of ambient light, ensuring stable recognition of dark-colored pull tabs and patterned pull tabs. In terms of structural design, the installation position of the detection frame 10 has been adapted and adjusted, so that the illumination point of the first detection head 11 is accurately positioned to the area corresponding to the cigarettes under the cigarette pack, and the second detection head 12 is aligned with the junction of the cardboard edge and the aluminum foil, using the physical boundary of the cardboard to establish a stable detection reference surface. In addition, the power supply module can reuse the original DC power supply system of the packaging machine (such as the output power distribution system of the YB45 component), reducing the impact of the modification on the original structure of the equipment. At the same time, the signal output terminal of the series line can be directly connected to key nodes such as the N12 board of the packaging machine's electrical control system, achieving seamless integration with the original shutdown and rejection logic of the equipment.

[0031] According to the present invention, an aluminum foil strip missing detection device includes a detection frame 10 comprising multiple detachable frame modules; wherein at least one frame module is provided with detection holes 14 for inserting a first detection head 11 and / or a second detection head 12. The detection frame 10 adopts a modular design, composed of multiple independently detachable frame modules, allowing the overall structure of the detection frame 10 to be flexibly adjusted according to the size characteristics of different cigarette packs (such as slim, medium, and standard cigarettes). By replacing modules of different sizes, it adapts to changes in parameters such as the width and height of the cigarette pack. At least one frame module has pre-drilled detection holes 14, the diameter of which matches the outer diameter of the first detection head 11 and the second detection head 12, allowing for direct insertion and fixing of the detection heads. The position of the detection holes 14 is precisely calculated to ensure that the inserted detection head is directly aligned with the target detection area on the side or bottom of the cigarette pack, ensuring the stability of the detection head installation and facilitating adjustment of the angle and depth of the detection head according to actual detection needs, thus improving the versatility and adaptability of the device.

[0032] Furthermore, according to the aluminum foil sheet missing detection device of the present invention, a stepped positioning surface 13 is provided between the frame modules; the stepped positioning surface 13 is provided with assembly holes 15 for fixed connection between the frame modules. The frame modules achieve rapid docking and precise positioning through the stepped positioning surface 13. The stepped positioning surface 13 is formed by a concave right-angle structure. When two adjacent frame modules are connected, the edge of one module forms a mechanical limit with the right-angle structure of the adjacent module, ensuring the relative positional accuracy between the modules in the horizontal direction. Simultaneously, the stepped positioning surface 13 is machined with assembly holes 15, through which bolts, clips, and other connecting parts are inserted to securely connect adjacent frame modules into a whole. This structural design simplifies the assembly process of the detection frame 10 and ensures the stability of the overall structure, providing a reliable installation reference for the detection head.

[0033] Furthermore, according to the aluminum foil pull tab missing detection device of the present invention, two detection holes 14 for the first detection head 11 and the second detection head 12 are arranged adjacently and respectively located on two mutually perpendicular structural surfaces of the detection frame 10, corresponding to the detection directions of the side and bottom of the cigarette pack. The two detection holes 14 for mounting the first detection head 11 and the second detection head 12 are spatially adjacent and respectively opened on two mutually perpendicular structural surfaces of the detection frame 10 (for example, one is located on the side upright plate of the detection frame 10, and the other is located on the bottom horizontal plate of the detection frame 10). This arrangement makes the detection direction of the first detection head 11 perpendicular to the side of the cigarette pack, which can accurately detect the aluminum foil pull tab area corresponding to the lower row of cigarettes on the side; the detection direction of the second detection head 12 is perpendicular to the bottom of the cigarette pack, directly facing the junction of the cardboard edge and the aluminum foil. The two detection directions are mutually perpendicular, forming a three-dimensional detection perspective, which can simultaneously cover the key detection areas of the side and bottom of the cigarette pack, effectively avoiding blind spots that may exist in single-direction detection, and further improving the accuracy of pull tab missing detection.

[0034] According to the present invention, a device for detecting missing aluminum foil strips is provided, wherein the first detection head 11 and the second detection head 12 are both fiber optic sensing heads, and the detection end of the fiber optic sensing head is provided with a dustproof cover. Specifically, the first detection head 11 and the second detection head 12 are both fiber optic sensing heads (such as the EH-305 type fiber optic sensing head), and their detection ends are equipped with dustproof covers. The dustproof cover is made of a wear-resistant and highly transparent material (such as high-hardness acrylic or quartz glass), and is tightly fitted to the detection end face of the fiber optic sensing head. In the cigarette production environment, a large amount of smoke, dust, and raw material debris are generated during the cigarette pack transportation process. The dustproof cover can effectively prevent these contaminants from directly adhering to the surface of the detection end, avoiding signal attenuation or misjudgment caused by optical element contamination. At the same time, the design of the cover does not affect the optical path transmission of the fiber optic sensing head, ensuring that infrared light or visible light can normally penetrate the cover to reach the cigarette pack detection area and stably feed back the reflected signal to the sensor.

[0035] According to the present invention, an aluminum foil pull tab missing detection device includes a first sensor and a second sensor, both of which are proximity sensors. An adjustment knob is provided on the housing of the proximity sensor to change the sensor's detection sensitivity. Specifically, both the first and second sensors are preferably proximity sensors (such as the ES-M1 type), and the adjustment knob can be integrated into the surface of their housings. This adjustment knob is associated with the signal processing module inside the sensor. Rotating the knob changes the detection sensitivity parameter: for example, when the knob is rotated clockwise, the detection sensitivity increases, and the sensor's recognition threshold for reflective signals or contour changes of the aluminum foil pull tab decreases, enabling the capture of weaker effective signals. This is suitable for detection scenarios involving dark-colored pull tabs or complex patterns resulting in low reflectivity. When the knob is rotated counterclockwise, the detection sensitivity decreases, reducing stray signals caused by ambient light interference, smoke reflection, etc., and avoiding false triggering of bright solid-color areas or areas without pull tabs. This adjustable design allows the sensor to flexibly adapt to different aluminum foil materials (such as bright solid colors and dark colors), pattern complexity, and dust concentration in the production environment, ensuring stable recognition accuracy when detecting aluminum foil sheets of different specifications such as fine and medium sizes, further reducing the probability of false detection and missed detection.

[0036] According to a device for detecting missing aluminum foil pull tabs based on the present invention, the signal output terminal of the first sensor is connected to the negative terminal of the second sensor via a wire, and the signal output terminal of the second sensor is connected to the signal input point of the control board of the packaging machine via a wire, forming a series detection loop. Specifically, the first sensor and the second sensor are connected in series to construct the detection loop. The signal output terminal of the first sensor is directly connected to the negative terminal of the second sensor via a wire, forming a series path for signal transmission; the signal output terminal of the second sensor is connected to a specific signal input point of the control board of the packaging machine via a wire. When the first detection head 11 detects the presence of a pull tab on the side of the cigarette pack, the first sensor outputs a valid signal, which is transmitted to the negative terminal of the second sensor, providing a prerequisite for the signal output of the second sensor; if the second detection head 12 simultaneously detects the presence of a pull tab at the bottom of the cigarette pack, the second sensor will output a valid signal and transmit it to the signal input point of the control board, the entire series loop is activated, the packaging machine determines that the cigarette pack is qualified and operates normally. If the first detection head 11 fails to detect the side pull tab, the first sensor will not output a signal, and the negative terminal of the second sensor will not be effectively triggered. Even if the second detection head 12 detects the pull tab, the second sensor will not be able to output a signal to the control board. Similarly, if the second detection head 12 fails to detect the bottom pull tab, even if the first sensor outputs a signal, the second sensor will still not output a signal to the control board. Both of these situations will cause the series circuit to be interrupted, the control board will not receive a valid signal, and thus trigger the packaging machine to stop alarm and reject the unqualified cigarette packs at the corresponding positions. This series design realizes the logical judgment of the two detection units through the logical connection of the electrical circuit, ensuring that the product is only judged as qualified when both detections pass, thus ensuring the rigor of the detection at the circuit level.

[0037] According to the present invention, an aluminum foil sheet missing detection device uses a 24V DC power supply module. The positive output terminal of the power supply module is connected to the positive terminals of the first and second sensors via wires. The negative output terminal of the power supply module is connected to the negative terminals of the first and second sensors via wires, forming a parallel power supply circuit. Specifically, the power supply module preferably uses a 24V DC power supply, compatible with the existing power distribution system of the packaging machine, ensuring power supply stability and equipment compatibility. Its positive output terminal is connected to the positive terminals of the first and second sensors via wires, and its negative output terminal is similarly connected to the negative terminals of the two sensors via wires, forming an independent parallel power supply circuit. The first and second sensors can simultaneously obtain 24V operating voltage from the power supply module, and their power supply circuits are independent of each other. The power supply status of one sensor will not affect the power supply of the other sensor. Even if one sensor experiences a power supply abnormality due to a fault (such as loose wiring or component damage), the other sensor can still maintain normal power supply and basic detection function, avoiding complete failure of the entire detection system due to a single power supply interruption. Meanwhile, the parallel circuit ensures that both sensors receive a stable voltage input, guaranteeing the normal operation of their internal circuits (such as the signal processing module and the light source driving module). This provides a reliable power foundation for accurately detecting the aluminum foil sheet pulling state and complements the signal logic of the series detection circuit, further enhancing the operational stability of the device.

[0038] According to the present invention, an aluminum foil pull tab missing detection device includes a first sensor and a second sensor, both of which incorporate an infrared modulation light source and a digital filtering circuit. The wavelength of the infrared modulation light source is preferably 940nm, and the digital filtering circuit is connected to the signal output terminal of the corresponding sensor. The 940nm infrared modulation light source built into the first and second sensors has strong penetrability, making it particularly suitable for the complex environment of cigarette packaging production with abundant smoke and dust. Infrared light of this wavelength is not easily absorbed by dark-colored aluminum foil pull tabs. Even when facing pull tabs and surface patterns in dark solid-color areas of new products, it can still stably reflect and form a recognizable light signal, effectively compensating for the shortcomings of traditional detection methods in identifying low-reflectivity pull tabs. Simultaneously, the digital filtering circuit built into the sensor is directly connected to the signal output terminal, processing the received reflected light signal and filtering out noise signals caused by ambient light, dust scattering, and other interference factors, retaining only the effective signal related to the presence state of the aluminum foil pull tab. This embodiment addresses both the light source characteristics and signal processing aspects, ensuring accurate identification of patterned pull tabs and dark-colored pull tabs, reducing false detections and missed detections caused by signal fluctuations.

[0039] Furthermore, according to the present invention, a non-defective aluminum foil sheet pull tab detection device has a series-connected signal output terminal connected to the control board of the packaging machine; the control board is provided with a terminal block corresponding to the signal output terminal; the terminal block is connected to the control circuit of the packaging machine. The series-connected signal output terminal is connected to the corresponding terminal block on the control board of the packaging machine via a wire, which provides a standardized interface for the input of detection signals. The terminal block is directly connected to the control circuit of the packaging machine (such as the logic control circuit of the MICRO-Ⅱ electronic control system) to form a complete signal transmission path. When the series detection loop is conducting, the effective signal is transmitted to the control circuit through the terminal block, and the control circuit determines that the cigarette pack is qualified and maintains the normal operation of the equipment; when the series loop is interrupted (no pull tab is detected by any sensor), no signal is transmitted to the control circuit, and the control circuit immediately triggers the preset shutdown program, displays the "missing pull tab" information on the host operation screen, and drives the rejection mechanism to separate the unqualified cigarette pack from the production flow at the corresponding position. This connection method realizes seamless integration between the detection device and the original control system of the packaging machine, without the need for major modifications to the core control logic of the equipment, and can rely on the original circuit to complete the identification and processing of unqualified cigarette packs.

[0040] According to a preferred embodiment of the aluminum foil sheet missing detection device of this application, such as Figure 5 As shown, a DC power supply circuit consisting of 24VDC and 0VDC is used. The device includes two ES-M1 type proximity sensors for side pull tab detection and bottom pull tab detection, respectively.

[0041] For the ES-M1 sensor with side-mounted pull tab detection: its brown terminal is connected to 24VDC, and its blue terminal is connected to 0VDC, forming the power supply path for the sensor's main circuit; the black terminal is the control output terminal, and the orange-red terminal is the disconnection alarm output power terminal. Both are marked with a maximum load limit of 100mA, and the black and orange-red terminals are respectively connected to subsequent circuits through lines to participate in signal transmission and monitoring.

[0042] For the ES-M1 sensor with bottom pull tab detection: the brown terminal is connected to 24VDC and the blue terminal is connected to 0VDC for power supply; the black and orange terminals also correspond to the maximum 100mA load limit, and the black terminal forms a signal path with the relevant circuit of the side pull tab detection sensor and the N12 board 09 input point through the circuit.

[0043] The two sensors form a series detection circuit through the above wiring. The black terminal of the ES-M1 sensor for bottom pull tab detection is finally connected to the 09 input point of the N12 board, transmitting the detection signal to the packaging machine control board. This enables the detection of whether the aluminum foil pull tab is missing. If there is an abnormality such as a missing pull tab, the circuit can trigger corresponding actions such as shutdown, alarm, and rejection to ensure product quality.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "method," "specific method," or "some methods," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or method is included in at least one embodiment or method of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or method. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or methods. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or methods described in this specification, as well as the features of different embodiments or methods.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for detecting missing aluminum foil sheets, characterized in that, include: The testing frame (10) is provided with a testing space, which is a frame structure that allows cigarette packs with aluminum foil pull tabs to stay or pass through; The first detection unit includes a first sensor and a first detection head (11) connected to the first sensor signal. The first detection head (11) is disposed on the detection frame (10) and is used to detect the aluminum foil paper pull tab on the side of the cigarette pack. The second detection unit includes a second sensor and a second detection head (12) connected to the second sensor signal. The second detection head (12) is disposed on the detection frame (10) and is used to detect the aluminum foil paper pull tab at the bottom of the cigarette pack. A power supply module is connected to the first sensor and the second sensor respectively, providing them with operating voltage; The signal output terminals of the first sensor and the second sensor are connected in series via a signal line, and the connected signal output terminals are connected to the packaging machine.

2. The aluminum foil sheet missing detection device according to claim 1, characterized in that, The testing frame (10) includes multiple detachable frame modules; At least one of the frame modules is provided with a detection hole (14) for inserting the first detection head (11) and / or the second detection head (12).

3. The aluminum foil sheet missing detection device according to claim 2, characterized in that, Step positioning surfaces (13) are provided between the frame modules. The step positioning surface (13) is provided with assembly holes (15) for fixed connection between frame modules.

4. The aluminum foil sheet missing detection device according to claim 2, characterized in that, The two detection holes (14) for the first detection head (11) and the second detection head (12) are arranged adjacently and are located on two mutually perpendicular structural surfaces of the detection frame (10) to correspond to the side and bottom detection directions of the cigarette pack.

5. The aluminum foil sheet missing detection device according to any one of claims 1 to 4, characterized in that, Both the first detection head (11) and the second detection head (12) are fiber optic sensing heads, and the detection end of the fiber optic sensing head is provided with a dustproof cover.

6. The aluminum foil sheet missing detection device according to any one of claims 1 to 4, characterized in that, Both the first sensor and the second sensor are proximity sensors. The housing of the proximity sensor is provided with an adjustment knob, which is used to change the detection sensitivity of the sensor.

7. The aluminum foil sheet missing detection device according to any one of claims 1 to 4, characterized in that, The signal output terminal of the first sensor is connected to the negative terminal of the second sensor via a wire, and the signal output terminal of the second sensor is connected to the signal input point of the control board of the packaging machine via a wire, forming a series detection loop.

8. The aluminum foil sheet missing detection device according to any one of claims 1 to 4, characterized in that, The power supply module is a 24V DC power supply; The positive output terminal of the power supply module is connected to the positive terminals of the first sensor and the second sensor respectively via wires; The negative output terminal of the power supply module is connected to the negative terminals of the first sensor and the second sensor respectively through wires, forming a parallel power supply circuit.

9. The aluminum foil sheet missing detection device according to any one of claims 1 to 4, characterized in that, Both the first sensor and the second sensor have built-in infrared modulation light sources and digital filtering circuits; The wavelength of the infrared modulation light source is 940nm, and the digital filtering circuit is connected to the signal output terminal of the corresponding sensor.

10. The aluminum foil sheet missing detection device according to claim 9, characterized in that, The connected signal output terminal is connected to the control board of the packaging machine. The control board is provided with wiring terminals corresponding to the signal output terminals; The terminal block is connected to the control circuit of the packaging machine.

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