Online cigarette pack inner frame paper detection device based on high-frequency magnetic field detection principle

Abstract

This invention provides an online cigarette pack inner frame paper detection device based on the high-frequency magnetic field detection principle, belonging to the technical field of cigarette pack inner frame paper detection. This online cigarette pack inner frame paper detection device includes a signal detection unit, a detection signal processing unit, a secondary driving unit for the cigarette pack, and a cigarette pack rejection unit. The signal detection unit is used to detect the inner frame paper inside the cigarette pack to be detected; the detection signal processing unit is used to process the signal of the inner frame paper detected by the signal detection unit to distinguish between qualified and unqualified cigarette packs; the secondary driving unit for the cigarette pack is used to push qualified cigarette packs in the moving direction; and the cigarette pack rejection unit is used to reject unqualified cigarette packs. This invention provides an online cigarette pack inner frame paper detection device based on the high-frequency magnetic field detection principle, which can solve the problem of low detection and resolution capability of existing monitoring devices for inner frame paper, leading to an increased monitoring misjudgment rate.

Description

Technical Field

[0001] This invention belongs to the field of cigarette pack inner frame paper detection technology, specifically, it relates to an online cigarette pack inner frame paper detection device based on the principle of high-frequency magnetic field detection. Background Technology

[0002] The inner frame paper of a cigarette pack refers to the cardboard inside the cigarette box used to wrap and secure the cigarettes. Located inside the cigarette box, it serves to protect and hold the cigarettes in place. The inner frame paper is typically made of pulp, possessing a certain degree of rigidity and strength to ensure the cigarettes are not damaged during transportation and storage. The inner frame paper plays a crucial role in the cigarette pack manufacturing process. First, the inner frame paper is cut to the appropriate shape and size and then placed inside the cigarette pack. The cigarettes are placed on the inner frame paper and then secured in the cigarette box with lining paper or foil. The presence of the inner frame paper allows the cigarette box to tightly wrap the cigarettes, providing a protective and insulating layer that maintains the shape and quality of the cigarettes.

[0003] Due to the high speed of packaging equipment, the loss of inner frame paper in cigarette packs is inevitable in actual production. To solve this problem, Chinese Patent No. CN212710163U (Application No. CN202021500507.0) discloses a five-wheel imaging intelligent detection device, which uses imaging principles to perform imaging detection at five stations of the packaging machine during the cigarette pack packaging process.

[0004] However, the imaging detection of the above-mentioned device has low resolution for detecting the inner frame paper, which leads to an increase in the false judgment rate. At the same time, the device performs the detection before the cigarette pack is fully packaged, so logically there is still a possibility that the inner frame paper will be missing after the detection. Summary of the Invention

[0005] In view of this, the present invention provides an online cigarette pack inner frame paper detection device based on the high-frequency magnetic field detection principle, which can solve the problem that the existing monitoring devices have low detection and resolution capabilities for inner frame paper, leading to an increased monitoring misjudgment rate.

[0006] This invention is implemented as follows:

[0007] This invention provides an online cigarette pack inner frame paper detection device based on the principle of high-frequency magnetic field detection, comprising a signal detection unit, a detection signal processing unit, a cigarette pack secondary driving unit, and a cigarette pack rejection unit.

[0008] The signal detection unit is used to detect the inner frame paper inside the cigarette pack to be tested;

[0009] The detection signal processing unit is used to process the signal of the inner frame paper inside the cigarette pack to be tested detected by the signal detection unit, and to distinguish between cigarette packs that pass the test and cigarette packs that fail the test.

[0010] The secondary drive unit for the cigarette pack is used to push the qualified cigarette pack in the moving direction;

[0011] The cigarette pack rejection unit is used to reject cigarette packs that fail the inspection in the direction in which the cigarette packs are moving.

[0012] The technical advantages of the online cigarette pack inner frame paper detection device based on the high-frequency magnetic field detection principle provided by this invention are as follows: By setting up a signal detection unit, the inner frame paper inside the cigarette pack to be detected can be detected, which can solve the problem of low detection and resolution of inner frame paper by existing monitoring devices, leading to an increased false judgment rate; by setting up a detection signal processing unit, the signal of the inner frame paper inside the cigarette pack to be detected detected by the signal detection unit is processed to distinguish between qualified and unqualified cigarette packs; by setting up a secondary cigarette pack driving unit, the qualified cigarette packs are pushed in the moving direction; by setting up a cigarette pack rejection unit, the unqualified cigarette packs are rejected in the moving direction of the cigarette packs.

[0013] Based on the above technical solution, the online cigarette pack inner frame paper detection device based on the high-frequency magnetic field detection principle of the present invention can be further improved as follows:

[0014] The cigarette pack to be tested moves in the moving direction on a cigarette pack conveyor belt, which is located on one side of the cigarette pack production device and is fixedly connected to the cigarette pack production device to drive the cigarette pack to be tested in the moving direction; the cigarette pack inner paper detection device is located on both sides of the cigarette pack conveyor belt to detect the inner frame paper inside the cigarette pack to be tested.

[0015] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting up a cigarette pack conveyor belt, the cigarette packs to be tested are transported from the cigarette pack production device to the online cigarette pack inner frame paper testing device for testing.

[0016] Furthermore, the signal detection unit includes a high-frequency magnetic field detection probe, a detection guide wheel, and a detection positioning optical fiber. The high-frequency magnetic field detection probe and the detection guide wheel are respectively fixedly installed on both sides of the cigarette pack conveyor belt, with a gap between them. The thickness of the control is equal to that of the cigarette pack to be tested. The high-frequency magnetic field detection probe is used to detect the position of the inner frame paper inside the cigarette pack to be tested, and the detection guide wheel is used to drive the cigarette pack to be tested to move in the direction of the cigarette pack conveyor belt. The detection positioning optical fiber is located near the high-frequency magnetic field detection probe and the detection guide wheel.

[0017] The beneficial effects of adopting the above-mentioned improved scheme are as follows: by setting up a high-frequency magnetic field detection probe, a detection guide wheel, and a detection positioning optical fiber, the inner frame paper inside the cigarette pack to be tested can be detected, which can solve the problem that the existing monitoring device has low detection resolution for the inner frame paper, resulting in an increased monitoring misjudgment rate.

[0018] Furthermore, the detection signal processing unit includes a high-frequency synchronous analog acquisition unit, a five-point moving average filtering processing unit, and a data comparison and judgment algorithm unit. The high-frequency synchronous analog acquisition unit is a detection signal processor used to collect the signal of the inner frame paper inside the cigarette pack to be tested detected by the high-frequency magnetic field detection probe, and simultaneously transmit the signal to the five-point moving average filtering processing unit. The five-point moving average filtering processing unit processes the signal of the inner frame paper inside the cigarette pack to be tested detected by the high-frequency magnetic field detection probe using a five-point moving average filter, and transmits the processed data to the data comparison and judgment algorithm unit for comparison, distinguishing between qualified and unqualified cigarette packs.

[0019] The beneficial effects of adopting the above-mentioned improved scheme are as follows: by setting up a high-frequency synchronous analog acquisition unit, a five-point moving average filtering processing unit, and a data comparison and judgment algorithm unit, the signal of the inner frame paper inside the cigarette pack to be tested detected by the signal detection unit is processed to distinguish between qualified and unqualified cigarette packs.

[0020] Furthermore, the secondary drive unit for the cigarette pack includes a first secondary drive wheel and a second secondary drive wheel. The first secondary drive wheel and the second secondary drive wheel are respectively arranged on both sides of the cigarette pack conveyor belt. The first secondary drive wheel and the second secondary drive wheel are synchronously set to rotate in opposite directions with the same speed, so as to drive the qualified cigarette packs to move in the direction of the cigarette pack to be tested.

[0021] Furthermore, the cigarette pack rejection unit includes an air-blowing rejection valve, a rejection cigarette pack collection box, and a rejection positioning optical fiber. The air-blowing rejection valve is located near the drive detection guide wheel of the cigarette pack to be tested. The rejection cigarette pack collection box is located opposite the air-blowing rejection valve. The air-blowing rejection valve is used to blow the unqualified cigarette packs off the cigarette pack conveyor belt. The rejection cigarette pack collection box is used to collect the unqualified cigarette packs. The rejection positioning optical fiber is located near the air-blowing rejection valve.

[0022] Furthermore, the high-frequency magnetic field detection probe includes a housing, a magnetic induction element, a connection interface, a sealing layer, an insulating layer, and a support assembly. The support assembly is positioned on one side of the cigarette pack conveyor belt, and its height from the ground is lower than the height of the surface of the cigarette pack conveyor belt from the ground. The housing is fixed to the support assembly on the side near the cigarette pack conveyor belt. The magnetic induction element is disposed inside the housing, and the insulating layer is provided between the housing and the magnetic induction element to prevent leakage current. The connection interface is used to connect the probe through the housing to the magnetic induction element, and the sealing layer is provided between the connection interface and the probe to improve the insulation performance of the probe.

[0023] Furthermore, the magnetic induction element is a magnetic induction coil, which is wound around an insulator, and its two ends are connected to a power source to provide a magnetic field.

[0024] Furthermore, the air-blowing rejection valve is sealed to the high-pressure air gun, which is vertically positioned to the cigarette pack conveyor belt to quickly blow the defective cigarette packs off the conveyor belt; the air-blowing rejection valve is electrically connected to the detection signal processor.

[0025] Furthermore, the rejected cigarette pack collection box is fixedly connected to the bottom of the cigarette pack conveyor belt to facilitate the continuous conveying of the cigarette packs to be tested by the cigarette pack conveyor belt.

[0026] Compared with existing technologies, the online cigarette pack inner frame paper detection device based on the high-frequency magnetic field detection principle provided by this invention has the following advantages: By setting up a signal detection unit, the inner frame paper inside the cigarette pack to be detected can be detected, which can solve the problem that the imaging detection of existing monitoring devices has low detection and resolution capabilities for inner frame paper, leading to an increased monitoring false judgment rate; by setting up a detection signal processing unit, the signal of the inner frame paper inside the cigarette pack to be detected detected by the signal detection unit is processed to distinguish between qualified and unqualified cigarette packs; by setting up a secondary cigarette pack driving unit, the qualified cigarette packs are pushed in the moving direction; by setting up a cigarette pack rejection unit, the unqualified cigarette packs are rejected in the moving direction of the cigarette packs. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1This is a schematic diagram of an online cigarette pack inner frame paper detection device based on the high-frequency magnetic field detection principle.

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 1. Cigarette pack conveyor belt; 10. Rejection fiber optic cable; 11. Detection fiber optic cable; 2. Cigarette pack to be inspected; 3. High-frequency magnetic field detection probe; 4. Detection signal processor; 5. Detection guide wheel; 6. Secondary drive wheel for the first cigarette pack; 7. Secondary drive wheel for the second cigarette pack; 8. Air-blowing rejection valve; 9. Rejection cigarette pack collection box. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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 this invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] like Figure 1 The figure shows a schematic diagram of the online cigarette pack inner frame paper detection device based on the high-frequency magnetic field detection principle provided by the present invention. The device includes a signal detection unit, a detection signal processing unit, a cigarette pack secondary driving unit, and a cigarette pack rejection unit.

[0037] The signal detection unit is used to detect the inner frame paper inside the cigarette pack 2 to be tested;

[0038] The detection signal processing unit is used to process the signal of the inner frame paper inside the cigarette pack 2 to be detected by the signal detection unit, and to distinguish between cigarette packs that pass the detection and those that fail the detection.

[0039] The secondary drive unit for the cigarette pack is used to push the qualified cigarette packs in the moving direction;

[0040] The cigarette pack rejection unit is used to reject cigarette packs that fail the inspection in the direction of cigarette pack movement.

[0041] The detection signal processing unit processes the signal of the inner frame paper inside the cigarette pack 2 detected by the signal detection unit, and the specific steps for distinguishing between qualified and unqualified cigarette packs include:

[0042] Synchronized with the detection fiber 11, the appearance of the inner frame paper in the passing cigarette pack is converted into an electrical signal by the high-frequency magnetic field detection probe 3. When the cigarette pack passes through the detection probe, it generates an electrical signal waveform. The detection signal processor 4 then performs high-speed analog-to-digital conversion on this electrical signal to sample it into a set of data. This set of data is then filtered by a five-point moving average and compared with the stored template data of the inner frame paper of the confirmed qualified cigarette pack. The similarity between the measured inner frame paper waveform data and the qualified template waveform data is calculated. The more similar the two are, the higher the value of the template waveform data (similarity ranges from 00 to 99). When the measured similarity value is less than the set threshold, the cigarette pack is considered unqualified; otherwise, it is considered qualified.

[0043] In the above technical solution, the cigarette pack 2 to be tested moves in the moving direction on the cigarette pack conveyor belt 1. The cigarette pack conveyor belt 1 is set on one side of the cigarette pack production device and is fixedly connected to the cigarette pack production device to drive the cigarette pack 2 to be tested to move in the moving direction. The inner paper detection device of the cigarette pack is set on both sides of the cigarette pack conveyor belt 1 to detect the inner frame paper inside the cigarette pack 2 to be tested.

[0044] Furthermore, in the above technical solution, the signal detection unit includes a high-frequency magnetic field detection probe 3, a detection guide wheel 5, and a detection positioning optical fiber 11. The high-frequency magnetic field detection probe 3 and the detection guide wheel 5 are respectively fixedly installed on both sides of the cigarette pack conveyor belt 1. A gap is provided between the high-frequency magnetic field detection probe 3 and the detection guide wheel 5 to control the thickness to be equal to that of the cigarette pack 2 to be tested. The high-frequency magnetic field detection probe 3 is used to detect the position of the inner frame paper inside the cigarette pack 2 to be tested. The detection guide wheel 5 is used to drive the cigarette pack 2 to be tested to move in the direction of the cigarette pack conveyor belt 1. The detection positioning optical fiber 11 is located near the high-frequency magnetic field detection probe 3 and the detection guide wheel 5.

[0045] Furthermore, in the above technical solution, the detection signal processing unit includes a high-frequency synchronous analog acquisition unit, a five-point moving average filtering processing unit, and a data comparison and judgment algorithm unit. The high-frequency synchronous analog acquisition unit includes a detection signal processor 4, which is used to collect the signal of the inner frame paper inside the cigarette pack 2 to be tested detected by the high-frequency magnetic field detection probe 3, and transmit the signal to the five-point moving average filtering processing unit. The five-point moving average filtering processing unit processes the signal of the inner frame paper inside the cigarette pack 2 to be tested detected by the high-frequency magnetic field detection probe 3 using five-point moving average filtering, and transmits the processed data to the data comparison and judgment algorithm unit for comparison, distinguishing between qualified and unqualified cigarette packs.

[0046] Furthermore, in the above technical solution, the secondary drive unit for cigarette packs includes a first secondary drive wheel 6 and a second secondary drive wheel 7. The first secondary drive wheel 6 and the second secondary drive wheel 7 are respectively arranged on both sides of the cigarette pack conveyor belt 1. The first secondary drive wheel 6 and the second secondary drive wheel 7 are synchronously set to rotate in opposite directions with the same speed, so as to drive the qualified cigarette packs to move in the direction of the cigarette packs to be tested 2.

[0047] Furthermore, in the above technical solution, the cigarette pack rejection unit includes an air-blowing rejection valve 8, a rejection cigarette pack collection box 9, and a rejection positioning optical fiber 10. The air-blowing rejection valve 8 is located near the drive detection guide wheel 5 of the cigarette pack 2 to be tested. The rejection cigarette pack collection box 9 is located opposite the cigarette pack 2 to be tested and the air-blowing rejection valve 8. The air-blowing rejection valve 8 is used to blow the unqualified cigarette packs off the cigarette pack conveyor belt 1. The rejection cigarette pack collection box 9 is used to collect the unqualified cigarette packs. The rejection positioning optical fiber 10 is located near the air-blowing rejection valve 8.

[0048] Furthermore, in the above technical solution, the high-frequency magnetic field detection probe 3 includes a shell, a magnetic induction element, a connection interface, a sealing layer, an insulating layer, and a support assembly. The support assembly is located on one side of the cigarette pack conveyor belt 1, and the height of the support assembly from the ground is lower than the height of the surface of the cigarette pack conveyor belt 1 from the ground. The shell is fixed to the side of the support assembly near the cigarette pack conveyor belt 1. The magnetic induction element is located inside the shell, and an insulating layer is provided between the shell and the magnetic induction element to prevent leakage. The connection interface is used to connect the probe through the shell to the magnetic induction element, and a sealing layer is provided between the connection interface and the probe to improve the insulation performance of the probe.

[0049] Furthermore, in the above technical solution, the magnetic induction element is a magnetic induction coil, which is wound on an insulator. The two ends of the magnetic induction coil are connected to a power source to provide a magnetic field.

[0050] Furthermore, in the above technical solution, the air-blowing rejection valve 8 is sealed to the high-pressure air gun, and the high-pressure air gun is set vertically to the cigarette pack conveyor belt 1 to quickly blow unqualified cigarette packs off the cigarette pack conveyor belt 1; the air-blowing rejection valve 8 is electrically connected to the detection signal processor 4.

[0051] The high-frequency magnetic field detection probe 3 is responsible for converting the appearance of the inner frame paper in the cigarette pack into an electrical signal. The detection signal processor 4, with a high-speed single-chip microcomputer STC15W408AS at its core, is responsible for high-speed analog-to-digital conversion, sampling, processing, calculation, and comparison of the electrical signal transmitted from the high-frequency magnetic field detection probe 3 to draw conclusions. Furthermore, in the above technical solution, the fixed connection between the cigarette pack collection box 9 and the bottom of the cigarette pack conveyor belt 1 is eliminated to facilitate the continuous conveying of the cigarette packs 2 to be tested by the cigarette pack conveyor belt 1.

[0052] The five-point moving average filter is a general-purpose filtering algorithm used to smooth signals and reduce the impact of noise. This algorithm can be implemented in a microcontroller. Below is a basic pseudocode example of a five-point moving average filter:

[0053] The first step is to define an array buffer of length 5 to store the five most recent sampled values.

[0054] The second step is to initialize the buffer to 0.

[0055] The third step is to continuously acquire and filter the signals:

[0056] The new sampled value is read into the variable newValue.

[0057] Add newValue to the last position in the buffer.

[0058] Remove the value at the first position in the buffer.

[0059] Step 4: Calculate the average value:

[0060] Define a variable sum, with an initial value of 0.

[0061] Iterate through the buffer and add each value to the sum.

[0062] Divide sum by 5 to get the average.

[0063] The data comparison and judgment algorithm combines two algorithms to calculate the similarity between two sets of waveform data:

[0064] Pearson correlation coefficient: Used to measure the linear correlation between two datasets. It can be calculated by taking the sample covariance and standard deviation of the two datasets.

[0065]

[0066]

[0067]

[0068] Euclidean distance: Used to measure the distance between two datasets. It involves calculating the difference between the two datasets at each time point, squared the differences, summing them, and then taking the square root.

[0069]

[0070]

[0071] In use, the cigarette pack conveyor belt 1 moves the cigarette pack 2 to be tested from the cigarette pack production equipment to the online cigarette pack inner frame paper detection device based on the high-frequency magnetic field detection principle. The high-frequency magnetic field detection probe 3 detects the inner frame paper inside the cigarette pack 2 and transmits the data to the detection signal processor 4. At the same time, the cigarette pack 2 to be tested is continuously moved in the direction of the cigarette pack conveyor belt 1 by the detection guide wheel 5. After processing, the detection signal processor 4 distinguishes between qualified and unqualified cigarette packs. The unqualified cigarette packs are rejected by the air rejection valve 8 and placed into the rejection cigarette pack collection box 9. The qualified cigarette packs are continuously moved in the direction of the cigarette pack conveyor belt 1 by the action of the first secondary drive wheel 6 and the second secondary drive wheel 7.

[0072] Specifically, the principle of this invention is as follows: the cigarette pack conveyor belt 1 moves the cigarette pack 2 to be tested from the cigarette pack production equipment to the online cigarette pack inner frame paper detection device based on the high-frequency magnetic field detection principle. The high-frequency magnetic field detection probe 3 detects the inner frame paper inside the cigarette pack 2 and transmits the data to the detection signal processor 4. At the same time, the cigarette pack 2 to be tested is continuously moved in the direction of the cigarette pack conveyor belt 1 by the detection guide wheel 5. After processing, the detection signal processor 4 distinguishes between qualified and unqualified cigarette packs. The unqualified cigarette packs are rejected by the air rejection valve 8 and placed into the rejection cigarette pack collection box 9. The qualified cigarette packs are continuously moved in the direction of the cigarette pack conveyor belt 1 by the action of the first secondary drive wheel 6 and the second secondary drive wheel 7.

[0073] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An online cigarette pack inner frame paper detection device based on the principle of high-frequency magnetic field detection, characterized in that, It has a signal detection unit, a detection signal processing unit, a secondary driving unit for cigarette packs, and a cigarette pack rejection unit. The signal detection unit is used to detect the inner frame paper inside the cigarette pack (2) to be tested; The detection signal processing unit is used to process the signal of the inner frame paper inside the cigarette pack (2) to be tested detected by the signal detection unit, and to distinguish between cigarette packs that pass the test and cigarette packs that fail the test. The secondary drive unit for the cigarette pack is used to push the qualified cigarette packs in the moving direction; The cigarette pack rejection unit is used to reject unqualified cigarette packs in the cigarette pack moving direction; The signal detection unit includes a high-frequency magnetic field detection probe (3), a detection guide wheel (5), and a detection positioning optical fiber (11). The high-frequency magnetic field detection probe (3) and the detection guide wheel (5) are respectively fixedly installed on both sides of the cigarette pack conveyor belt (1). A gap is provided between the high-frequency magnetic field detection probe (3) and the detection guide wheel (5). The gap is equal to the thickness of the cigarette pack (2) to be tested. The high-frequency magnetic field detection probe (3) is used to detect the position of the inner frame paper inside the cigarette pack (2) to be tested. The detection guide wheel (5) is used to drive the cigarette pack (2) to be tested to move in the direction of the cigarette pack conveyor belt (1). The detection positioning optical fiber (11) is located near the high-frequency magnetic field detection probe (3) and the detection guide wheel (5). The detection signal processing unit includes a high-frequency synchronous analog acquisition unit, a five-point moving average filtering processing unit, and a data comparison and judgment algorithm unit. The high-frequency synchronous analog acquisition unit includes a detection signal processor (4), which is used to collect the signal of the inner frame paper inside the cigarette pack (2) to be tested detected by the high-frequency magnetic field detection probe (3), and transmit the signal of the inner frame paper inside the cigarette pack (2) to be tested to the five-point moving average filtering processing unit. The five-point moving average filtering processing unit processes the signal of the inner frame paper inside the cigarette pack (2) to be tested detected by the high-frequency magnetic field detection probe (3) using five-point moving average filtering, and transmits the processed data to the data comparison and judgment algorithm unit for comparison, and distinguishes between qualified and unqualified cigarette packs.

2. The online cigarette pack inner frame paper detection device based on the high-frequency magnetic field detection principle according to claim 1, characterized in that, The cigarette pack (2) to be tested moves in the moving direction on the cigarette pack conveyor belt (1). The cigarette pack conveyor belt (1) is located on one side of the cigarette pack production device and is fixedly connected to the cigarette pack production device to drive the cigarette pack (2) to be tested to move in the moving direction. The cigarette pack inner paper detection device is located on both sides of the cigarette pack conveyor belt (1) to detect the inner frame paper inside the cigarette pack (2) to be tested.

3. The online cigarette pack inner frame paper detection device based on the high-frequency magnetic field detection principle according to claim 2, characterized in that, The secondary drive unit for the cigarette pack includes a first secondary drive wheel (6) and a second secondary drive wheel (7). The first secondary drive wheel (6) and the second secondary drive wheel (7) are respectively arranged on both sides of the cigarette pack conveyor belt (1). The first secondary drive wheel (6) and the second secondary drive wheel (7) are synchronously arranged to rotate in opposite directions with the same speed, so as to drive the qualified cigarette packs to move in the direction of the cigarette pack to be tested (2).

4. The online cigarette pack inner frame paper detection device based on the high-frequency magnetic field detection principle according to claim 3, characterized in that, The cigarette pack rejection unit includes an air-blowing rejection valve (8), a rejection cigarette pack collection box (9), and a rejection positioning optical fiber (10). The air-blowing rejection valve (8) is located near the drive detection guide wheel (5) of the cigarette pack (2) to be tested. The rejection cigarette pack collection box (9) is located opposite the air-blowing rejection valve (8) of the cigarette pack (2) to be tested. The air-blowing rejection valve (8) is used to blow the unqualified cigarette packs off the cigarette pack conveyor belt (1). The rejection cigarette pack collection box (9) is used to collect the unqualified cigarette packs. The rejection positioning optical fiber (10) is located near the air-blowing rejection valve (8).

5. The online cigarette pack inner frame paper detection device based on the high-frequency magnetic field detection principle according to claim 4, characterized in that, The high-frequency magnetic field detection probe (3) includes a shell, a magnetic induction element, a connection interface, a sealing layer, an insulating layer, and a support assembly. The support assembly is located on one side of the cigarette pack conveyor belt (1), and the height of the support assembly from the ground is lower than the height of the surface of the cigarette pack conveyor belt (1) from the ground. The shell is fixed to the side of the support assembly near the cigarette pack conveyor belt (1). The magnetic induction element is located inside the shell. The insulating layer is provided between the shell and the magnetic induction element to prevent leakage. The connection interface is used to connect the probe through the shell to the magnetic induction element. The sealing layer is provided between the connection interface and the probe to improve the insulation performance of the probe.

6. The online cigarette pack inner frame paper detection device based on the high-frequency magnetic field detection principle according to claim 5, characterized in that, The magnetic induction element is a magnetic induction coil, which is wound on an insulator. The two ends of the magnetic induction coil are connected to a power source to provide a magnetic field.

7. The online cigarette pack inner frame paper detection device based on the high-frequency magnetic field detection principle according to claim 6, characterized in that, The air-blowing rejection valve (8) is sealed to the high-pressure air gun, which is set vertically to the cigarette pack conveyor belt (1) to quickly blow the unqualified cigarette packs off the cigarette pack conveyor belt (1); the air-blowing rejection valve (8) is electrically connected to the detection signal processor (4).

8. The online cigarette pack inner frame paper detection device based on the high-frequency magnetic field detection principle according to claim 7, characterized in that, The rejected cigarette pack collection box (9) is fixedly connected to the bottom of the cigarette pack conveyor belt (1) to facilitate the continuous conveying of the cigarette packs (2) to be tested by the cigarette pack conveyor belt (1).

Images