A cigarette weight ultra-precision detection method and device and a cigarette making machine

Abstract

The application discloses a cigarette weight ultra-precision detection method, device and cigarette making machine. The cigarette weight ultra-precision detection method comprises the following steps: receiving the density and radius of a plurality of sampling points on a double-length cigarette, wherein the double-length cigarette comprises a front cigarette and a rear cigarette connected with each other, and the sampling point width of each sampling point is the same; and calculating the first weight of the front cigarette and the second weight of the rear cigarette according to the density, the sampling point width and the radius of all the sampling points. The application sets a plurality of sampling points on the double-length cigarette, calculates the weight of the cigarette by using the density, the radius and the sampling point width of all the sampling points, avoids the online measurement error caused by taking the radius as a constant, and thus reduces the calibration error.

Description

Technical Field

[0001] This application relates to the field of detection technology, and more specifically, to an ultra-precision detection method, apparatus, and cigarette rolling machine for cigarette weight. Background Technology

[0002] Cigarette weight is one of the most important physical indicators of cigarettes, and how to accurately control the weight online has always been a key research focus for the tobacco industry both domestically and internationally. After years of technological development, the existing weight control system in the tobacco industry uses microwave density sensors to detect the weight of cigarettes, feeds the actual weight signal back to the control system, compares it with a given weight, and controls the actuator to adjust the leveling device up and down, thereby controlling the weight of the cigarettes.

[0003] Therefore, microwave density sensors are among the most important quality inspection sensors in cigarette making machines and are a core component of cigarette weight control systems. Cigarette weight control systems built upon this detection system have greatly promoted the advancement of cigarette manufacturing technology, changing the manufacturing mode where weight control relied solely on manual adjustment. Microwave density sensors can perform online weight detection, enabling not only control but also the elimination of overall and localized weight anomalies. Therefore, improving the accuracy of online detection is of great significance for enhancing cigarette quality. In recent years, with the demands for cost reduction, efficiency improvement, and digital design, we need to further expand the mining of underlying manufacturing data. The most crucial aspect of cigarette making equipment and processes is ensuring that the detection data within the cigarette sticks is more accurate.

[0004] The principle of cigarette weight detection based on microwave is as follows: Figure 3 As shown, the signal processing system performs 128 density samples on a double-length tobacco stick (referred to as the front tobacco stick and the rear tobacco stick respectively on the tobacco machine) between two positioning pulses of the shaft encoder. The system measures the positioning pulses and incremental pulses generated by the shaft encoder and uses these two sets of pulses to calculate the density of the tobacco stick.

[0005] As shown above, the density of each cigarette stick (both the first and second batches) is sampled at 64 points. By weighted summing of the sampling results, the weight of a single cigarette stick can be calculated. Generally, offline comparative sampling is used to calibrate the online detection values ​​to ensure that the online detection quality of the microwave sensor is consistent with that of the offline instrument.

[0006] However, when calculating the weight of the cigarette pack based on the sampling results, the circumference of the cigarette pack is treated as a constant, meaning the radius at each sampling point is the same. The weight of the cigarette pack is obtained by combining this constant with the length of the cigarette pack. But the actual circumference of the cigarette pack is a constantly changing quantity, and it needs to be continuously controlled during the production process to fluctuate around the center value. Therefore, the existing calculation method inevitably leads to a large online measurement error, resulting in a large calibration error during calibration.

[0007] Furthermore, when calculating the weight of the cigarette pack based on sampling results, the cigarette length is treated as a constant, meaning the lengths of the first and second cigarette packs are the same. However, the actual lengths after cutting have a certain margin of error, which can cause online measurement errors. For example, taking a 54 mm unit length cigarette pack and a 650 mg cigarette specification as an example, it can be approximated that each millimeter corresponds to 12 mg of weight (although the distribution of tobacco inside the cigarette is uneven). The first cut of the cigarette machine is to cut the cigarette pack into double-length cigarette packs (including the first and second packs). If there is an error in the length of the first and second packs after cutting, assuming the first pack is 1 mm longer (55 mm) and the second pack is 1 mm shorter (53 mm), the difference between the calculated and actual weights will reach 24 mg. Online measurement errors can lead to significant calibration errors during calibration. Summary of the Invention

[0008] This application provides an ultra-precision method, apparatus, and cigarette rolling machine for detecting the weight of cigarettes. Multiple sampling points are set on a double-length cigarette stick, and the weight of the cigarette stick is calculated using the density, radius, and sampling point width detected at all sampling points. This avoids the online measurement error caused by treating the radius as a constant, thereby reducing calibration error.

[0009] This application provides an ultra-precise method for detecting the weight of cigarettes, including:

[0010] The density and radius of multiple sampling points on a double-length smoke bar are received. The double-length smoke bar contains interconnected front and rear smoke bars, and the sampling point width of each sampling point is the same.

[0011] The first weight of the preceding tobacco bar and the second weight of the following tobacco bar are calculated based on the density, width, and radius of all sampling points.

[0012] Preferably, calculating the first weight of the preceding tobacco stick and the second weight of the following tobacco stick specifically includes:

[0013] The first half of all sampling points is used as the sampling points of the front cigarette bar, and the second half of all sampling points is used as the sampling points of the back cigarette bar, so that the lengths of the front and back cigarette bars are equal.

[0014] The first weight is calculated based on the sampling points of the preceding cigarette pack and their corresponding sampling point width, density, and radius; the second weight is calculated based on the sampling points of the following cigarette pack and their corresponding sampling point width, density, and radius.

[0015] Preferably, the ultra-precision detection method further includes:

[0016] After receiving a double-length tobacco stick, which is cut into a front tobacco stick and a rear tobacco stick, the second length of the front tobacco stick and the rear tobacco stick is taken as the actual length of the front tobacco stick and the rear tobacco stick.

[0017] Furthermore, the first weight is calculated based on the sampling points corresponding to the actual length of the preceding tobacco stick, as well as their corresponding density and radius; the second weight is calculated based on the sampling points corresponding to the actual length of the following tobacco stick, as well as their corresponding density and radius.

[0018] Preferably, the ultra-precision detection method further includes:

[0019] The cigarette weight detection system is calibrated based on the first and second weights determined by the actual lengths of the front and rear cigarette sticks.

[0020] Preferably, the cigarette weight detection system includes a density detection sensor and a circumference detection sensor installed at the first cutting station, which are used to detect the density and radius of each sampling point, respectively;

[0021] The first cutting station is used to cut out double-length cigarette strips.

[0022] Preferably, the cigarette weight detection system also includes a length sensor at the primary slitting station for detecting the second length of the preceding and following cigarette sticks;

[0023] The first slitting station is used to cut double-length tobacco strips into front tobacco strips and back tobacco strips.

[0024] This application also provides an ultra-precision detection device for cigarette weight, including a first receiving module and a calculation module;

[0025] The first receiving module is used to receive the density and radius of multiple sampling points on the double-length smoke bar. The double-length smoke bar includes a front smoke bar and a rear smoke bar that are connected to each other. The sampling point width of each sampling point is the same.

[0026] The calculation module is used to calculate the first weight of the front smoke bar and the second weight of the rear smoke bar based on the density, width and radius of all sampling points.

[0027] Preferably, the calculation module includes a partitioning module and a first weight calculation module;

[0028] The partitioning module is used to take the first half of all sampling points as the sampling points of the front cigarette bar and the second half of all sampling points as the sampling points of the back cigarette bar, so that the lengths of the front and back cigarette bars are equal.

[0029] The first weight calculation module is used to calculate the first weight based on the sampling points of the preceding tobacco stick and their corresponding sampling point width, density and radius, and to calculate the second weight based on the sampling points of the following tobacco stick and their corresponding sampling point width, density and radius.

[0030] Preferably, the ultra-precision detection device further includes a second receiving module, which is used to receive the second length of the front and rear tobacco strips after the double-length tobacco strip is cut into front and rear tobacco strips, as the actual length of the front and rear tobacco strips;

[0031] Furthermore, the calculation module includes a second weight calculation module, which is used to calculate the first weight based on the sampling points corresponding to the actual length of the preceding tobacco stick and their corresponding density and radius, and to calculate the second weight based on the sampling points corresponding to the actual length of the following tobacco stick and their corresponding density and radius.

[0032] This application also provides a cigarette rolling machine, including a cigarette weight detection system, which is used to perform the above-described ultra-precision detection method.

[0033] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0034] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0035] Figure 1 A flowchart of the ultra-precision method for detecting the weight of cigarettes provided in this application;

[0036] Figure 2 A structural diagram of a preferred embodiment of the cigarette weight detection system provided in this application;

[0037] Figure 3 This is a block diagram illustrating the principle of a density detection sensor.

[0038] Figure 4 The image shows the cavity of the density detection sensor and the resonance curves at different densities.

[0039] Figure 5 This is a schematic diagram illustrating the segmented calculation principle in density detection provided in this application.

[0040] Figure 6 A structural diagram of the ultra-precision cigarette weight detection device provided in this application. Detailed Implementation

[0041] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0042] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0043] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0044] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0045] This application provides an ultra-precision method, apparatus, and cigarette rolling machine for detecting the weight of cigarettes. Multiple sampling points are set on a double-length cigarette stick. The weight of the cigarette stick is calculated using the density, radius, and sampling point width detected at all sampling points, avoiding online measurement errors caused by treating the radius as a constant, thereby reducing calibration errors. Furthermore, this application calculates the weight of the preceding and following cigarette sticks based on their actual lengths after cutting, avoiding online measurement errors caused by treating the radii and lengths of the preceding and following cigarette sticks as constants, thereby reducing calibration errors.

[0046] Example 1

[0047] like Figure 1 As shown, the ultra-precision method for detecting the weight of cigarettes provided in this application includes:

[0048] S110: Receives the density and radius of multiple sampling points on a double-length smoke bar, which includes interconnected front and rear smoke bars, and the sampling point width of each sampling point is the same.

[0049] S120: Calculate the first weight of the front flue and the second weight of the rear flue based on the density, width and radius of all sampling points.

[0050] First Embodiment

[0051] As one embodiment, in this application, the cigarette weight detection system includes a host computer (e.g., an industrial computer, used to execute S110 and S120) and a shaft encoder installed on the first cutting station (see reference). Figure 2 Mark 1 in the text), density detection sensor (please refer to...) Figure 2 Mark 2 in the diagram) and the circumference detection sensor (please refer to...) Figure 2 Marker 3 in the diagram is used to detect the density and radius of each sampling point. The first cutting station is used to cut out double-length cigarette strips. Figure 2In the diagram, 4 represents the cutting device, 6 represents the double-length cigarette obtained after cutting at the first cutting station, and 7 represents the single-length front and rear cigarette sticks obtained after cutting at a single slitting station. In this embodiment, the first and second weights are calculated based on the density, radius, and width of each sampling point.

[0052] Density detection sensors use microwaves to detect density. For example... Figure 3 As shown, the microwave signal is generated by a microwave signal generator and sent to the resonant cavity assembly via a transmission line. When the cigarette stick being tested passes through the resonant cavity, different densities and moisture contents of the cigarette stick will cause varying degrees of change in the microwave electromagnetic field energy parameters. By detecting, analyzing, and processing the changes in energy parameters, the density signal of the cigarette stick is obtained and output to the cigarette weight calculation module to realize the detection of cigarette weight. The resonant curve in the frequency domain is obtained by the detector. This resonant curve reflects the electromagnetic characteristics of the current cavity. The vertex of the resonant curve is the point of highest energy, and the corresponding frequency is the resonant frequency in that state.

[0053] When the tobacco stick passes through the microwave resonant cavity, tobacco stick segments with different densities and moisture contents will have different dielectric constants. The real part of the dielectric constant causes a frequency shift (e.g., Figure 4 As shown on the horizontal axis), the imaginary part causes a change in the loaded quality factor (Q value) (e.g., Figure 4 (As shown on the vertical axis). By measuring the changes in resonant frequency and quality factor before and after the resonant cavity is empty and filled, the complex permittivity of the medium can be approximately estimated. The higher the density and humidity, the higher the complex permittivity, the lower the resonance curve (the lower the Q value), and the greater the resonant frequency shift.

[0054] The microwave scanning head obtains sampling data through AD sampling, and the relationship between the sampling data and the tobacco density is expressed as follows:

[0055] (1)

[0056] ρ i Indicates the density of tobacco shreds; w i This represents the sampling data of AD; K and Q are the matching coefficients. The density of the tobacco can be calculated using the above formula.

[0057] The host computer performs density sampling on a double-length tobacco stick (including interconnected front and rear tobacco sticks) a preset number of times (e.g., 256 times, 128 times, etc.) between two positioning pulses from the shaft encoder. This involves dividing the double-length tobacco stick into a preset number of sampling points (n) for segmentation. Each sampling point has the same width. Figure 5 As shown.

[0058] Based on the above, in S110, the density detection sensor and the circumference detection sensor use the positioning pulses and incremental pulses generated by the shaft encoder to collect the density and radius at each sampling point.

[0059] The host computer synchronizes and matches all the densities and radii collected by the density detection sensor and the circumference detection sensor through the synchronization bus 8, that is, it matches the density and radius of the same sampling point.

[0060] In this embodiment, the lengths of the front and rear tobacco sticks are equal. Therefore, in S120, calculating the first weight of the front tobacco stick and the second weight of the rear tobacco stick specifically includes:

[0061] P1: The first half of all sampling points (from point 1 to point 2) The sampling point (the first sampling point) is used as the sampling point for the previous cigarette bar, and the latter half of all sampling points (the second sampling point) is used as the sampling point for the previous cigarette bar. (+1 to n sampling points) are used as sampling points for the subsequent smoke bar, so that the lengths of the preceding and subsequent smoke bars are equal.

[0062] P2: Calculate the first weight based on the sampling points of the previous cigarette pack and their corresponding sampling point width, density, and radius. The second weight is calculated based on the sampling points of the subsequent cigarette pack and their corresponding sampling point width, density, and radius. ,Right now

[0063] (2)

[0064] (3)

[0065] It can also calculate the total weight of a double-length cigarette pack. :

[0066] (4)

[0067] Second Embodiment

[0068] In a preferred embodiment, based on the above, the cigarette weight detection system further includes a length sensor 5 at the primary slitting station, used to detect the second lengths of the preceding and following cigarette sticks obtained after the double-length cigarette sticks are cut, as the actual lengths l1 and l2 of the preceding and following cigarette sticks, respectively. Figure 2 As shown in the diagram. The primary slitting station is used to cut double-length tobacco strips into front and rear tobacco strips.

[0069] As one example, the length sensor system includes an industrial camera and an LED light source. The LED light source illuminates the cut front and rear smoke bars, and the industrial camera takes pictures. The length information is obtained after machine vision analysis.

[0070] In this preferred embodiment, the ultra-precise method for detecting the weight of cigarettes further includes:

[0071] The host computer receives the double-length cigarette stick, which is then cut into a front cigarette stick and a rear cigarette stick. The second length of the front and rear cigarette sticks is taken as their actual length. Furthermore, in step S120, the first weight is calculated based on the sampling points corresponding to the actual length of the front cigarette stick, along with their corresponding density and radius. The second weight is calculated based on the sampling points corresponding to the actual length of the rear cigarette stick, along with their corresponding density and radius.

[0072] (5)

[0073] (6)

[0074] This embodiment takes into account cutting losses. Taking a preset quantity n of 128 and a sampling point width of 1 mm for each segment as an example, if the cutting occurs at the midpoint of segment 64, the first 0.5 mm of segment 64 belongs to the preceding tobacco stick, and the last 0.5 mm of segment 64 belongs to the following tobacco stick. Therefore, for the entire double-length tobacco stick, the weight of the preceding tobacco stick is the weight of segments 1-63 and the first 0.5 mm of segment 64, and the weight of the following tobacco stick is the weight of the last 0.5 mm of segment 64 and segments 65-128. This improves the accuracy of weight detection, further enhances control performance, and reduces tobacco consumption.

[0075] Preferably, the cigarette weight detection system is calibrated based on the first weight and the second weight determined according to the actual lengths of the front and rear cigarette sticks in this preferred embodiment, so as to minimize the calibration error as much as possible.

[0076] The following are examples of two implementation methods:

[0077] Taking the ZJ17E cigarette rolling machine as an example, the preset weight of the product is 666 mg, the production speed is 7000 cigarettes / minute, which is approximately 112 cigarettes / second, and the standard circumference of the cigarette stick is 24.2 mm, or about 7.7 mm in diameter. For ease of understanding and calculation, each double-length cigarette stick is measured in 128 segments, that is, each single-length cigarette stick is measured in 64 segments. The standard length of a single-length cigarette stick is set at 64 mm, meaning that the length measured at each sampling point is 1 mm.

[0078] Tables 1 and 2 show the detection data of the front and rear flue sticks obtained by the detection methods of the first embodiment and the prior art, respectively:

[0079] Table 1: Front-end cigarette stick test data

[0080]

[0081] Table 2: Post-processing cigarette pack testing data

[0082]

[0083] According to the first embodiment:

[0084] (7)

[0085] (8)

[0086] (9)

[0087] According to existing technology, the total weight of a double-length cigarette pack is 1341.83 mg, with the first cigarette pack weighing approximately 672.08 mg and the second cigarette pack weighing approximately 669.75 mg.

[0088] According to the second embodiment, if the length l1 of the pre-cut tobacco strip obtained in one slitting station is 63.5 mm and the length l2 of the post-cut tobacco strip is 64.5 mm, then it can be known that the cut was made at the midpoint of segment 64. Therefore, the first 0.5 mm portion of segment 64 belongs to the pre-cut tobacco strip, and the last 0.5 mm portion of segment 64 belongs to the post-cut tobacco strip. For the entire double-length tobacco strip, the weight of the pre-cut tobacco strip is the weight of segments 1-63 and the first 0.5 mm portion of segment 64, and the weight of the post-cut tobacco strip is the weight of the last 0.5 mm portion of segment 64 and segments 65-128. Therefore:

[0089] (10)

[0090] (11)

[0091] During the calibration process, if the offline measurement result is W 前道取样 =662.1 mg, W 后道取样 =674.2 mg.

[0092] As can be seen from the above, the gap between the online detection results and offline measurement results of the prior art is greater than the gap between the online detection results and offline measurement results of the first embodiment, and the gap between the online detection results and offline measurement results of the first embodiment is greater than the gap between the online detection results and offline measurement results of the second embodiment. Compared with the prior art, the online detection results of the first embodiment are more accurate; compared with the first embodiment, the online measurement results of the second embodiment can not only detect the problem of cigarette length, but also more accurately calibrate the cigarette weight detection system.

[0093] To verify the effect of the second embodiment, a sample of cigarettes of a preset weight was taken for verification (this is a basic function of the ZJ17E cigarette making machine). Specifically, 100 cigarettes were sampled, and the following were calculated: 1) the deviation between the average value and the preset weight value; 2) the standard deviation.

[0094] Table 3 shows the accuracy achieved using the second embodiment and the prior art. As can be seen from Table 3, compared to the prior art, the second embodiment shows a significant reduction in both mean deviation and standard deviation, with reductions of 32.6% and 12.6%, respectively.

[0095] Table 3

[0096]

[0097] Example 2

[0098] Based on the aforementioned ultra-precision detection method, this application also provides an ultra-precision detection device for cigarette weight. For example... Figure 6 As shown, the ultra-precision detection device includes a first receiving module 610 and a calculation module 620.

[0099] The first receiving module 610 is used to receive the density and radius of multiple sampling points on a double-length smoke bar. The double-length smoke bar includes a front smoke bar and a rear smoke bar that are connected to each other, and the sampling point width of each sampling point is the same.

[0100] The calculation module 620 is used to calculate the first weight of the front smoke bar and the second weight of the rear smoke bar based on the density, width and radius of all sampling points.

[0101] Preferably, the calculation module 620 includes a division module 6201 and a first weight calculation module 6202.

[0102] The partitioning module 6201 is used to take the first half of all sampling points as the sampling points of the front smoke bar and the second half of all sampling points as the sampling points of the back smoke bar, so that the lengths of the front smoke bar and the back smoke bar are equal.

[0103] The first weight calculation module 6202 is used to calculate the first weight based on the sampling points of the preceding tobacco stick and their corresponding sampling point width, density and radius, and to calculate the second weight based on the sampling points of the following tobacco stick and their corresponding sampling point width, density and radius.

[0104] Preferably, the ultra-precision detection device further includes a second receiving module 630, which is used to receive the second length of the front and rear tobacco strips after the double-length tobacco strip is cut into front and rear tobacco strips, as the actual length of the front and rear tobacco strips.

[0105] Furthermore, the calculation module 620 includes a second weight calculation module 6203, which is used to calculate the first weight based on the sampling points corresponding to the actual length of the preceding tobacco stick and their corresponding density and radius, and to calculate the second weight based on the sampling points corresponding to the actual length of the following tobacco stick and their corresponding density and radius.

[0106] Example 3

[0107] Based on the above, this application also provides a cigarette rolling machine, which includes a cigarette weight detection system for performing the above-mentioned ultra-precision detection method.

[0108] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A method for ultra-precise detection of cigarette weight, characterized in that, include: The system receives the density and radius of multiple sampling points on a double-length cigarette stick, which includes interconnected front and rear cigarette sticks, and the sampling point width of each sampling point is the same. The cigarette weight detection system includes a density detection sensor and a circumference detection sensor installed on a first cutting station, which are used to detect the density and radius of each sampling point, respectively. The first cutting station is used to cut out double-length cigarette sticks. The first weight of the front cigarette bar and the second weight of the rear cigarette bar are calculated based on the density, width and radius of all sampling points. Specifically, the first half of all sampling points are used as sampling points for the front cigarette bar, and the second half of all sampling points are used as sampling points for the rear cigarette bar, so that the lengths of the front and rear cigarette bars are equal. The first weight is calculated based on the sampling points of the preceding tobacco stick and their corresponding sampling point width, density, and radius; the second weight is calculated based on the sampling points of the following tobacco stick and their corresponding sampling point width, density, and radius.

2. The ultra-precision method for detecting the weight of cigarettes according to claim 1, characterized in that, Also includes: After the double-length tobacco stick is cut into a front tobacco stick and a rear tobacco stick, the second length of the front tobacco stick and the rear tobacco stick is taken as the actual length of the front tobacco stick and the rear tobacco stick. Furthermore, the first weight is calculated based on the sampling points corresponding to the actual length of the preceding tobacco stick, as well as their corresponding density and radius, and the second weight is calculated based on the sampling points corresponding to the actual length of the following tobacco stick, as well as their corresponding density and radius.

3. The ultra-precision method for detecting the weight of cigarettes according to claim 2, characterized in that, Also includes: The cigarette weight detection system is calibrated based on the first and second weights determined according to the actual lengths of the front and rear cigarette sticks.

4. The ultra-precision method for detecting the weight of cigarettes according to claim 3, characterized in that, The cigarette weight detection system also includes a length sensor at the primary slitting station, used to detect the second length of the preceding and following cigarette sticks; The first slitting station is used to cut double-length cigarette bars into front cigarette bars and rear cigarette bars.

5. A high-precision device for detecting the weight of cigarettes, characterized in that, It includes a first receiving module and a computing module; The first receiving module is used to receive the density and radius of multiple sampling points on a double-length cigarette bar, wherein the double-length cigarette bar includes a front cigarette bar and a rear cigarette bar connected to each other, and the sampling point width of each sampling point is the same; The calculation module is used to calculate the first weight of the front tobacco bar and the second weight of the rear tobacco bar based on the density, width and radius of all sampling points; The calculation module specifically includes a partitioning module and a first weight calculation module; The division module is used to take the first half of all sampling points as the sampling points of the front cigarette bar and the second half of all sampling points as the sampling points of the back cigarette bar, so that the lengths of the front and back cigarette bars are equal. The first weight calculation module is used to calculate the first weight based on the sampling points of the preceding cigarette pack and their corresponding sampling point width, density and radius, and to calculate the second weight based on the sampling points of the following cigarette pack and their corresponding sampling point width, density and radius.

6. The ultra-precision cigarette weight detection device according to claim 5, characterized in that, It also includes a second receiving module, which is used to receive the second length of the front and rear tobacco sticks after the double-length tobacco stick is cut into front and rear tobacco sticks, as the actual length of the front and rear tobacco sticks; Furthermore, the calculation module includes a second weight calculation module, which is used to calculate the first weight based on the sampling points corresponding to the actual length of the preceding tobacco stick and their corresponding density and radius, and to calculate the second weight based on the sampling points corresponding to the actual length of the following tobacco stick and their corresponding density and radius.

7. A cigarette rolling machine, characterized in that, The invention includes a cigarette weight detection system, which is used to perform the ultra-precision detection method according to any one of claims 1-4.

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