A device and method for detecting cigarette density distribution based on microwave technology

Abstract

The application provides a kind of online comprehensive test platform cigarette density distribution detection device and method based on microwave technology, it is related to tobacco production detection technical field, the device includes test platform, microwave detection unit, propeller device and data processing unit, test platform is provided with the propeller device, propeller device is provided with microwave detection unit, microwave detection unit and propeller device are connected data processing unit, the method includes obtaining the density curve of cigarette and moisture detection, obtains a certain amount of density curve, calculates average density distribution curve, calculates the compaction end position and compaction amount of cigarette based on average density distribution curve, calculates the deviation between electrical cut position and mechanical cut position, adjusts cigarette making machine equipment based on deviation value.The application solves the problem of long-term dependence on manual observation or offline debugging, has higher precision and real-time performance, helps to establish a full-automatic closed-loop adjustment system, improves product consistency and process response efficiency.

Description

Technical Field

[0001] This invention relates to the field of tobacco production testing technology, and in particular to an online integrated testing platform for detecting cigarette density distribution based on microwave technology, as well as a method thereof. Background Technology

[0002] In current cigarette production processes, to ensure product quality, it is typically necessary to monitor indicators such as cigarette density and moisture content in real time. Traditional testing methods mostly employ mechanical measurement or offline manual sampling, which suffers from low measurement accuracy, poor efficiency, and the inability to provide real-time guidance for production adjustments. Furthermore, the detection of deviations in the compaction end position, compaction amount, and the position of the electrical cut versus the mechanical cut has long relied on rough calculations made manually or through other offline methods, resulting in poor accuracy and cumbersome operations. Therefore, a real-time, accurate testing method and device that can guide equipment parameter adjustments is needed.

[0003] During the cigarette rolling process, the microwave detector obtains the clock pulse synchronization signal (PSCUT) and clock pulse increment signal (PSINC) from the weight control system of the cigarette rolling machine. The clock pulse synchronization signal indicates the start and end positions of each double-length cigarette segment. Based on this signal, the microwave detector then distributes the continuously detected density and moisture values ​​to different cigarettes according to the pulse increment signal, and obtains the average density and moisture of each cigarette, as well as the density and moisture distribution curve.

[0004] The aforementioned clock synchronization pulse signal is sent from the weight control system to the microwave detector, which is synchronized with the shaft encoder and related to the machine speed. The microwave receives one PSCUT signal for every two cigarettes, and the PSINC signal provides 250 pulses between the two PSCUT pulses (=250 pulses for two cigarettes).

[0005] The cigarette machine's weight control system generates the aforementioned clock synchronization pulse signals PSCUT and PSINC based on the cigarette production speed. A PSCUT signal is emitted every two cigarettes. The rising edge of the PSCUT pulse signal indicates the starting position of the first cigarette in a pair, and the rising edge of the next PSCUT signal indicates the ending position of the second cigarette in that pair, and also the starting position of the first cigarette in the next pair. The PSINC signal provides 250 pulses between two PSCUT pulses.

[0006] The cigarettes are continuously cut from the tobacco strip into individual cigarettes by a cutting mechanism. The microwave detector relies on the clock synchronization pulse signal (PSCUT) and incremental pulse signal (PSINC) emitted by the weight control system of the cigarette rolling machine to calibrate the detection data. The rising edge of the PSCUT signal represents the starting position of each pair of cigarettes, while the PSINC signal provides position increment information at a fixed resolution (usually 250 pulses for 2 cigarettes). Therefore, based on the PSCUT and PSINC signals, the microwave detector can accurately allocate the continuously collected density and moisture data to the corresponding cigarettes, thereby forming the density and moisture curves for each cigarette.

[0007] However, because the actual mechanical position of the cigarette cutter (i.e., the actual physical cut of the cigarette) may differ from the logical position represented by the PSCUT signal, the "starting position of each cigarette" determined by the microwave detector deviates from the actual physical starting position of the cigarette. This deviation is the "deviation between the electrical cut position and the mechanical cut position." Once this deviation exists, it will cause an overall shift in the mapping of the detection data onto the cigarette, resulting in the following problems: 1. The characteristic points of the cigarette density curve (such as the location of the compacted end) do not match the actual physical location; 2. The calculation of the weight and moisture content of a single cigarette is inaccurate; 3. The superposition of density curves of multiple cigarettes results in distortion, affecting the subsequent algorithm's judgment of indicators such as compaction amount and average density.

[0008] To address the aforementioned problems, the core of this invention lies in establishing a precise physical position reference for the tested cigarettes, independent of the cigarette machine's clock signal, within an offline or online integrated testing platform, thereby achieving accurate calibration of the "electromechanical" cut deviation. To this end, this invention introduces a distance sensor into the pusher device. Utilizing its precise sensing of physical displacement, a physical position reference independent of the cigarette machine's clock signal is established for the cigarette density curve detected by the integrated testing platform, providing a high-precision physical position reference for subsequent curve comparison and deviation calculation.

[0009] In summary, it is essential to design an online integrated testing platform for detecting cigarette density distribution based on microwave technology. Summary of the Invention

[0010] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide an online integrated testing platform for cigarette density distribution detection device and method based on microwave technology.

[0011] To achieve the above objectives, the present invention provides the following solution: This invention provides an online integrated testing platform for cigarette density distribution detection based on microwave technology, comprising: a testing platform, a microwave detection unit, a thruster device, and a data processing unit. The thruster device is mounted on the testing platform, the microwave detection unit is mounted on the thruster device, and the microwave detection unit and the thruster device are connected to the data processing unit. The propulsion device includes a drive module, a screw mechanism, a nut block, a push rod, a guide pipe, and a distance sensor. The guide pipe is connected to the microwave detection unit. The drive module drives the screw mechanism. The nut block is mounted on the screw mechanism and connected to the push rod. The push rod extends into the interior of the guide pipe. The drive module drives the screw mechanism to rotate, thereby causing the nut block to move along the screw mechanism. The push rod pushes the tail of the cigarette through the microwave detection unit. The distance sensor is fixedly mounted on the guide pipe or integrated on the push rod and is connected to the data processing unit. The distance sensor is used to sense and record the axial displacement of the cigarette as it is pushed in the guide pipe in real time, providing precise position data for each detection point of the cigarette. The microwave detection unit is used to detect the density curve and moisture content of cigarettes passing through it. The data processing unit is used to process the density curve, specifically as follows: A certain number of density curves are obtained and superimposed to obtain the average density distribution curve of the cigarettes produced by the cigarette rolling machine. By superimposing a certain number of density curves, the coordinates of the point with the highest density in the superimposed curves are calculated, i.e., the location of the compaction end. Determine the point of highest density on the superimposed curve, calculate the ratio of this highest density value to the average density of the entire density curve, subtract 1, and then convert it to a percentage value to obtain the compaction amount; The data processing unit synchronizes the precise location data with the density data scanned by the microwave detection unit to form a density curve to be measured with a precise location reference. The unit then performs correlation analysis between the density curve to be measured and the density curve scanned by the detector built into the cigarette machine. Based on the curve similarity algorithm, the horizontal offset distance between the two curves is determined, which is the deviation between the electrical cut position and the mechanical cut position.

[0012] Furthermore, the drive module is a drive motor, and the distance sensor is one of an optical grating ruler, a magnetic grating ruler, a wire encoder, or a laser displacement sensor.

[0013] This invention also provides a method for detecting the cigarette density distribution on an online integrated testing platform based on microwave technology, applied to the aforementioned device for detecting the cigarette density distribution on an online integrated testing platform based on microwave technology, comprising: Step 1: Detect the density curve and moisture content of cigarettes using an online integrated testing platform cigarette density distribution detection device; Step 2: Obtain a certain number of density curves and calculate the average density distribution curve based on them; Step 3: Calculate the compaction end position and compaction amount of the cigarette based on the average density distribution curve; Step 4: Calculate the deviation between the electrical cut position and the mechanical cut position; Step 5: Adjust the cigarette machine equipment based on the deviation value.

[0014] Further, in step 1, the density curve and moisture content of the cigarettes are detected using an online integrated testing platform cigarette density distribution detection device, specifically as follows: The device is installed near the exit of the cigarette machine production line. A robotic arm or manual labor is used to automatically collect a single cigarette from the production line exit and place it into a guide pipe. The drive module drives the screw mechanism to rotate, which in turn drives the nut block to move along the screw mechanism. The push rod pushes the tail of the cigarette so that it passes through the microwave detection unit. While the push rod propels the cigarette forward, the distance sensor continuously senses the axial displacement of the cigarette and sends the displacement signal to the data processing unit in real time. The microwave detection unit performs density curve and moisture detection on the cigarettes passing through it.

[0015] Further, in step 2, a certain number of density curves are obtained, and the average density distribution curve is calculated based on them, specifically as follows: A certain number of density curves are obtained and superimposed to obtain the average density distribution curve of the cigarettes produced by the cigarette rolling machine.

[0016] Furthermore, in step 3, the method for calculating the position of the compaction end is as follows: By superimposing a certain number of density curves, the coordinates of the point with the highest density in the superimposed curves are calculated, i.e., the location of the compaction end.

[0017] Furthermore, in step 3, the method for calculating the compaction amount is as follows: Determine the point of highest density on the superimposed curve, calculate the ratio of this highest density value to the average density of the entire density curve, subtract 1, and then convert it to a percentage value to obtain the compaction amount.

[0018] Further, in step 4, the deviation between the electrical cut position and the mechanical cut position is calculated, specifically as follows: Based on the precise position data sensed by the distance sensor, the data processing unit performs position reference calibration on the density curve scanned by the microwave detection unit to form a density curve to be measured with precise physical position mapping. The correlation analysis is performed between the density curve to be measured with a precise physical location mapping and the density curve scanned by the detector built into the cigarette machine equipment. Based on the curve similarity algorithm, the horizontal offset distance between the two curves is determined, which is the deviation between the electrical cut position and the mechanical cut position.

[0019] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects: This invention provides an online integrated testing platform for cigarette density distribution detection and a method based on microwave technology. The method includes detecting the density curve and moisture content of cigarettes using the online integrated testing platform's cigarette density distribution detection device, obtaining a certain number of density curves, calculating an average density distribution curve based on these curves, calculating the compaction end position and compaction amount of the cigarettes based on the average density distribution curve, establishing an independent and precise physical position benchmark for curve comparison by introducing a distance sensor, performing similarity analysis between the average density distribution curve and the average density curve scanned by the detector built into the cigarette rolling machine, and accurately calculating the deviation between the electrical and mechanical cut positions, adjusting the cigarette rolling machine based on the deviation value. The device includes a testing platform, a microwave detection unit, a pusher device, and a data processing unit. The pusher device is mounted on the testing platform, the microwave detection unit is mounted on the pusher device, and the microwave detection unit and the pusher device are connected to the data processing unit. This invention utilizes microwave technology to achieve real-time and accurate detection of cigarette density and moisture profiles, improving production testing efficiency and accuracy. By superimposing density profiles, the compaction end position and compaction amount can be accurately calculated, providing real-time guidance for production adjustments. Through the integration of a distance sensor and a microwave detection unit, precise detection of the deviation between the electrical and mechanical cut positions is achieved, completely eliminating reliance on the cigarette machine's own pulse signals. This facilitates intuitive adjustment of equipment parameters, effectively improving the stability of cigarette production quality and solving the problem of long-term reliance on manual observation or offline debugging. It possesses higher precision and real-time performance, contributing to the establishment of a fully automated closed-loop adjustment system and greatly improving product consistency and process response efficiency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments 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.

[0021] Figure 1 This is a schematic diagram of the device structure of the present invention; Figure 2 This is a schematic diagram of the method flow of the present invention.

[0022] Reference numerals in the attached diagram: 1. Drive module; 2. Screw mechanism; 3. Nut block; 4. Push rod; 5. Guide pipe; 6. Microwave detection unit. Detailed Implementation

[0023] 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, and 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.

[0024] The purpose of this invention is to provide an online integrated testing platform for cigarette density distribution detection device and method based on microwave technology, which solves the problem of long-term reliance on manual observation or offline debugging, has higher accuracy and real-time performance, helps to establish a fully automatic closed-loop adjustment system, and improves product consistency and process response efficiency.

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 As shown, the present invention provides an online integrated testing platform for cigarette density distribution detection based on microwave technology, comprising: a testing platform, a microwave detection unit 6, a thruster device, and a data processing unit. The thruster device is disposed on the testing platform, and the microwave detection unit 6 is disposed on the thruster device. The microwave detection unit 6 and the thruster device are connected to the data processing unit. The propulsion device includes a drive module 1, a screw mechanism 2, a nut block 3, a push rod 4, and a guide pipe 5. The guide pipe 5 is connected to the microwave detection unit 6. The drive module 1 consists of a DC motor with a motor driver and a pulley reduction mechanism. Its output shaft drives the screw mechanism 2 to rotate via a synchronous belt. The screw mechanism 2 is a precision lead screw assembly, with both ends fixedly supported by bearing seats, providing good rotational stability and positioning rigidity. The nut block 3 is mounted on the lead screw thread and fixedly connected to the push rod 4, and can reciprocate linearly in the direction of lead screw rotation. One end of the push rod 4 is connected to the nut block 3, and the other end passes into the guide pipe and abuts against the tail end of the cigarette. When the drive module 1 rotates, it drives the screw mechanism 2 to rotate, thereby driving the nut block 3 to move linearly, and thus pushing the cigarette to smoothly pass through the microwave detection cavity along the guide channel at a constant linear velocity, completing the entire process density / moisture curve scan.

[0027] The propeller device also includes a distance sensor (integrated inside the push rod 4 or fixed to the guide pipe 5), which is electrically connected to the data processing unit. In this embodiment, the distance sensor is preferably a high-precision magnetic scale, with its reading head mounted on the nut block 3 and the magnetic strip attached to the outer wall of the guide pipe 5 along the movement direction of the push rod 4. When the drive module 1 drives the push rod 4 to move the cigarette, the magnetic scale reads the axial displacement of the nut block 3, i.e., the tail end of the cigarette, in real time and sends the precise physical position of the cigarette to the data processing unit in the form of a digital signal, thereby providing an absolute position coordinate independent of the cigarette machine clock for each frame of microwave density data.

[0028] The pusher device uses push rod 4 to push the cigarette along the guide channel through the microwave detection cavity. The push rod 4 is made of a low dielectric constant material (preferably PEEK material), which enables the acquisition of density data of each cigarette without interfering with the detection field strength distribution.

[0029] The microwave detection unit 6 is used to detect the density curve and moisture content of the cigarettes passing through it. A conventional microwave detection device can be used, such as a microwave generating module, a detector module and a resonant cavity. The data processing unit is used to process the density curves. It can be an industrial control computer commonly used in the industrial field. It is connected to the microwave detection unit 6 through a data communication cable, receives and stores the density curves of a certain number of cigarettes, and calculates the average density distribution curve of the cigarettes produced by the machine by superposition calculation. Then, it calculates the position and compaction amount of the cigarette compaction end. The data processing unit also receives the precise position signal output by the distance sensor, and converts the density-time curve collected by the microwave detection unit 6 into a density-precise physical position curve. This is used as the test curve with an absolute physical position reference. The unit compares the cigarette density curve scanned by the online integrated testing platform with the cigarette density curve scanned by the microwave detector on the cigarette machine on the production line, calculates and outputs the horizontal position deviation value between the electrical cut position and the mechanical cut position.

[0030] The drive module 1 is a drive motor.

[0031] like Figure 2 As shown, the present invention also provides a method for detecting the density distribution of cigarettes on an online integrated testing platform based on microwave technology, applied to the aforementioned device for detecting the density distribution of cigarettes on an online integrated testing platform based on microwave technology, comprising: Step 1: Detect the density curve and moisture content of cigarettes using an online integrated testing platform cigarette density distribution detection device; Step 2: Obtain a certain number of density curves and calculate the average density distribution curve based on them; Step 3: Calculate the compaction end position and compaction amount of the cigarette based on the average density distribution curve; Step 4: Calculate the deviation between the electrical cut position and the mechanical cut position; Step 5: Adjust the cigarette machine equipment based on the deviation value.

[0032] In step 1, the density curve and moisture content of the cigarettes are detected using the online integrated testing platform's cigarette density distribution detection device. Specifically: Cigarette samples are obtained from the exit of the cigarette machine production line by manual sampling or automatic sampling by a robotic arm. They are placed in the cigarette inlet of the comprehensive testing platform to enter the cigarette testing channel. The drive module drives the screw mechanism to rotate, which in turn drives the nut block to move along the screw mechanism. The push rod pushes the tail of the cigarette to pass through the microwave detection unit. During the process of the push rod propelling the cigarette forward, the distance sensor senses the axial displacement of the cigarette tail in real time and sends the displacement data to the data processing unit; The microwave detection unit performs density curve and moisture detection on the cigarettes passing through it.

[0033] In step 2, a certain number of density curves are obtained, and the average density distribution curve is calculated based on them, specifically as follows: A certain number of density curves are obtained and superimposed to obtain the average density distribution curve of the cigarettes produced by the cigarette rolling machine.

[0034] In step 3, the method for calculating the position of the compaction end is as follows: By superimposing a certain number of density curves, the coordinates of the point with the highest density in the superimposed curves are calculated, i.e., the location of the compaction end.

[0035] In step 3, the method for calculating the compaction amount is as follows: Determine the point of highest density on the density curve, calculate the ratio of this highest density to the average density of the entire density curve, subtract 1, and then convert it to a percentage value to obtain the compaction amount.

[0036] The compaction end position and compaction amount are two important production process parameters in cigarette production. Each cigarette brand has certain requirements for these two process parameters. The two data calculated in step 3 can be used to verify the compaction end position and compaction amount detected in real time on the cigarette production equipment.

[0037] In step 4, the deviation between the electrical cut position and the mechanical cut position is calculated, specifically as follows: The data processing unit calibrates the position of the density curve scanned by the microwave detection unit based on the precise displacement data sensed by the distance sensor, forming a density curve to be measured with precise physical position mapping. The density curve to be measured with precise physical location mapping is then compared with the density curve scanned by the detector on the cigarette machine. Based on the curve similarity algorithm, the horizontal offset distance between the two curves is determined, which is the deviation between the electrical cut position and the mechanical cut position. It is explained in detail, including: 1. The density curve scanned by the online integrated test bench and calibrated by the distance sensor position is recorded as follows: The density curve scanned by the built-in microwave detector of the cigarette rolling machine is denoted as... First, the B curve is adjusted to match the amplitude of the A curve using a scaling algorithm. The formula is as follows: ; 2. Adjust the The curve is gradually shifted along the horizontal axis by k steps (axis-coded pulse steps, PSINC), and calculations are performed for each shift. and The Euclidean distance between them is calculated using the following formula: (when When the curve shifts in the negative direction of the horizontal axis); (when When the curve shifts in the positive direction of the horizontal axis); 3. Find the location within the predetermined translation range. Get the minimum value The value is the deviation of the cut position.

[0038] This deviation value is based on the actual physical distance provided by the distance sensor and can be directly used to guide operators to quantitatively adjust the electrical cut position parameters on the cigarette machine equipment, so that the electrical and mechanical cut positions are precisely aligned.

[0039] In step 5, the cigarette machine equipment is adjusted based on the deviation value, specifically as follows: The deviation value is provided to the operator to visually adjust the electrical cut position parameters on the cigarette machine equipment, so that the electrical and mechanical cut positions are aligned.

[0040] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0041] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A microwave-based online integrated testing platform for detecting cigarette density distribution, characterized in that, include: The test stand, microwave detection unit, thruster device, and data processing unit are provided. The thruster device is installed on the test stand, the microwave detection unit is installed on the thruster device, and the microwave detection unit and the thruster device are connected to the data processing unit. The propulsion device includes a drive module, a screw mechanism, a nut block, a push rod, a guide pipe, and a distance sensor. The guide pipe is connected to the microwave detection unit. The drive module drives the screw mechanism. The nut block is mounted on the screw mechanism and connected to the push rod. The push rod extends into the interior of the guide pipe. The drive module drives the screw mechanism to rotate, thereby causing the nut block to move along the screw mechanism. The push rod pushes the tail of the cigarette through the microwave detection unit. The distance sensor is fixedly mounted on the guide pipe or integrated on the push rod and is connected to the data processing unit. The distance sensor is used to sense and record the axial displacement of the cigarette as it is pushed in the guide pipe in real time, providing precise position data for each detection point of the cigarette. The microwave detection unit is used to detect the density curve and moisture content of cigarettes passing through it. The data processing unit is used to process the density curve, specifically as follows: A certain number of density curves are obtained and superimposed to obtain the average density distribution curve of the cigarettes produced by the cigarette rolling machine. By superimposing a certain number of density curves, the coordinates of the point with the highest density in the superimposed curves are calculated, i.e., the location of the compaction end. Determine the point of highest density on the superimposed curve, calculate the ratio of this highest density value to the average density of the entire density curve, subtract 1, and then convert it to a percentage value to obtain the compaction amount; The data processing unit synchronizes the precise location data with the density data scanned by the microwave detection unit to form a density curve to be measured with a precise location reference. The unit then performs correlation analysis between the density curve to be measured and the density curve scanned by the detector built into the cigarette machine. Based on the curve similarity algorithm, the horizontal offset distance between the two curves is determined, which is the deviation between the electrical cut position and the mechanical cut position.

2. The apparatus according to claim 1, characterized in that, The drive module is a drive motor, and the distance sensor is one of an optical grating ruler, a magnetic grating ruler, a wire encoder, or a laser displacement sensor.

3. A method for detecting cigarette density distribution on an online integrated testing platform based on microwave technology, applied to the cigarette density distribution detection device on an online integrated testing platform based on microwave technology as described in any one of claims 1-2, characterized in that, include: Step 1: Detect the density curve and moisture content of cigarettes using an online integrated testing platform cigarette density distribution detection device; Step 2: Obtain a certain number of density curves and calculate the average density distribution curve based on them; Step 3: Calculate the compaction end position and compaction amount of the cigarette based on the average density distribution curve; Step 4: Calculate the deviation between the electrical cut position and the mechanical cut position; Step 5: Adjust the cigarette machine equipment based on the deviation value.

4. The method according to claim 3, characterized in that, In step 1, the density curve and moisture content of the cigarettes are detected using the online integrated testing platform's cigarette density distribution detection device. Specifically: The device is installed near the exit of the cigarette machine production line. A robotic arm or manual labor is used to automatically collect a single cigarette from the production line exit and place it into a guide pipe. The drive module drives the screw mechanism to rotate, which in turn drives the nut block to move along the screw mechanism. The push rod pushes the tail of the cigarette so that it passes through the microwave detection unit. While the push rod propels the cigarette forward, the distance sensor continuously senses the axial displacement of the cigarette and sends the displacement signal to the data processing unit in real time. The microwave detection unit performs density curve and moisture detection on the cigarettes passing through it.

5. The method according to claim 4, characterized in that, In step 2, a certain number of density curves are obtained, and the average density distribution curve is calculated based on them, specifically as follows: A certain number of density curves are obtained and superimposed to obtain the average density distribution curve of the cigarettes produced by the cigarette rolling machine.

6. The method according to claim 5, characterized in that, In step 3, the method for calculating the position of the compaction end is as follows: By superimposing a certain number of density curves, the coordinates of the point with the highest density in the superimposed curves are calculated, i.e., the location of the compaction end.

7. The method according to claim 6, characterized in that, In step 3, the method for calculating the compaction amount is as follows: Determine the point of highest density on the superimposed curve, calculate the ratio of this highest density value to the average density of the entire density curve, subtract 1, and then convert it to a percentage value to obtain the compaction amount.

8. The method according to claim 7, characterized in that, In step 4, the deviation between the electrical cut position and the mechanical cut position is calculated, specifically as follows: Based on the precise position data sensed by the distance sensor, the data processing unit performs position reference calibration on the density curve scanned by the microwave detection unit to form a density curve to be measured with precise physical position mapping. The correlation analysis is performed between the density curve to be measured with a precise physical location mapping and the density curve scanned by the detector built into the cigarette machine equipment. Based on the curve similarity algorithm, the horizontal offset distance between the two curves is determined, which is the deviation between the electrical cut position and the mechanical cut position.

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