Splice adhesive application amount detection method based on ultrasonic flowmeter and cigarette making unit

Abstract

The application discloses a kind of based on ultrasonic flowmeter's mouthpiece glue application amount detection method and cigarette machine group, the conception is in based on given condition, at detection starting moment, the first cumulative flow value of the ultrasonic flowmeter clamped in glue liquid pipeline and the cigarette paper disc size value at this time are acquired;When detection ends, the second cumulative flow value of the ultrasonic flowmeter and the cigarette paper disc size value at this time are acquired;According to first, second cumulative flow value, mouthpiece glue density value, and the paper disc size value or given production parameter that is respectively acquired at detection starting and ending time is combined, the application amount of cigarette paper mouthpiece glue is measured.This application does not affect normal production rhythm, can satisfy the demand of on-line real-time detection to mouthpiece glue application amount, facilitate dynamic adjustment in production process, in addition, it also improves the detection precision of mouthpiece glue application amount, avoids the shortcoming of estimated total number of cigarettes, simultaneously, without changing original cigarette machine group hardware, greatly improves the detection efficiency of mouthpiece glue application amount.

Description

Technical Field

[0001] This invention relates to the field of cigarette manufacturing, and in particular to a method for detecting the amount of adhesive applied to the joint based on an ultrasonic flow meter, and a cigarette making machine. Background Technology

[0002] The adhesive used in cigarette paper sealing is applied to the longitudinal joint of the cigarette, with a width of about 1mm. The amount of adhesive applied is small, and the application area on the cigarette rolling machine is also small, making detection difficult. However, the amount of adhesive applied significantly affects the physical quality, smoking quality, and safety parameters of the cigarette, as well as its appearance, raw material consumption rate, and equipment operating efficiency. Unfortunately, there are no national or industry standards for detecting the amount of adhesive applied in cigarette paper sealing. Previously, cigarette rolling machine operators relied mainly on experience to judge the amount of adhesive applied, such as by observing the adhesive flow rate. This often resulted in significant differences in the actual amount applied across different machines and shifts.

[0003] Currently, the tobacco industry primarily uses the following mechanisms to detect the amount of adhesive applied to the cigarette sealing area: simulating the machine's operation by applying adhesive and weighing it directly, then calculating the amount of adhesive applied based on the cigarette rolling machine's speed; or extrapolating the amount of adhesive applied based on cigarette production volume and adhesive usage. Other methods include accurately weighing the dried coated and uncoated cigarette paper and the solid content of the adhesive to estimate the amount of adhesive applied to the sealing area; adding markers to the sealing adhesive and then rolling cigarettes containing these markers, then estimating the amount of adhesive applied by detecting the amount of markers in the cigarette paper; and some studies have proposed methods that calculate the amount of adhesive applied by measuring the width of the sealing adhesive mark and by using a near-infrared probe to determine the moisture content at the sealing adhesive application point.

[0004] After practical verification and in-depth analysis, the aforementioned methods have at least the following problems: (1) Calculating the amount of adhesive applied to the cigarette seam by measuring the cigarette production and adhesive usage (weighing method) is inaccurate due to reasons such as cigarette pack running and residual cigarette removal, and can only roughly measure the average amount of adhesive applied to the seam; (2) Calculating the amount of adhesive applied to the cigarette seam by accurately weighing the dried coated cigarette paper, uncoated cigarette paper, and the solid content of the adhesive (drying method) is difficult because the basis weight of the cigarette paper and the solid content of the adhesive fluctuate and are not constant values. Accurate measurement of the amount of adhesive applied to the sizing area can only roughly measure the average amount of adhesive applied to the sizing area of ​​a certain length of cigarette paper. In addition, the sample preparation process requires drying and other operations, which is complicated, time-consuming and inefficient. (3) Calculating the amount of adhesive applied by measuring the width of the adhesive residue of the sizing area cannot determine the actual thickness of the coating due to wetting and other effects. Furthermore, it cannot be accurately measured due to the influence of coating uniformity. (4) Calculating the amount of adhesive applied by detecting the moisture content of the coating area with an infrared probe also has the problem of not being able to determine the actual coating thickness. The thickness of the glue and the solid content of the glue fluctuate, making accurate measurement impossible; (5) By adding markers to the glue and then rolling cigarettes with the glue containing the markers, the amount of glue applied to the cigarette is estimated by detecting the amount of markers in the cigarette paper (marker measurement method). This method is complicated and has a long testing cycle, and is only suitable for equipment inspection, instrument calibration and test testing; (6) Simulate the start-up state, apply glue and weigh it directly, and then calculate the amount of glue applied according to the speed of the cigarette machine. Since the glue application needs to reach a certain time before it can be relatively accurate, it can only measure the average amount of glue applied to a single cigarette within a certain time period, and cannot measure the amount of glue applied to a single cigarette. Moreover, the glue is applied directly, and the glue nozzle is not blocked or moved by the cigarette paper. However, in the actual production process, the glue application nozzle of the glue is in close contact with the high-speed moving cigarette paper. The cigarette paper will generate a certain interaction force on the glue self-flowing process in the nozzle. This force does not exist in the glue self-flowing process, so it is different from the actual glue application process and there is a certain measurement error.

[0005] In summary, this invention analyzes existing methods and research on adhesive application rate detection in the industry and finds that they generally suffer from problems such as the need for offline analysis, complex operation, large errors in detection results, and low detection efficiency. They cannot effectively solve the problem of rapid and accurate measurement of adhesive application rate, nor can they meet the need for real-time adjustment of this parameter during the production process based on the detection results. Consequently, they are also unable to meet the requirements of high efficiency, high precision, and high reliability in industrial production. Summary of the Invention

[0006] In view of the above, the present invention aims to provide a method for detecting the amount of adhesive applied to the joint of cigarette making machine based on an ultrasonic flow meter, so as to solve the aforementioned technical problems.

[0007] The technical solution adopted in this invention is as follows:

[0008] In a first aspect, the present invention provides a method for detecting the amount of adhesive applied to the joint of a sealant based on an ultrasonic flow meter, comprising:

[0009] Based on the given conditions, at the start of the detection, the first cumulative flow value of the ultrasonic flow meter clamped in the adhesive pipeline is obtained, and the current cigarette paper tray size value is obtained.

[0010] When the cigarette making machine unit reaches the preset detection end time, the second cumulative flow value of the ultrasonic flow meter is obtained, and the current cigarette paper tray size value is obtained.

[0011] The amount of adhesive applied to the cigarette paper is measured based on the first cumulative flow value, the second cumulative flow value, the pre-obtained adhesive density value, and the cigarette paper tray size value obtained at the start and end times of the detection, or in combination with predetermined production parameters.

[0012] In at least one of the possible implementations, the method for calculating the amount of adhesive applied in conjunction with the cigarette paper tray size includes:

[0013] The total amount of adhesive consumed during the detection period is calculated using the first cumulative flow value and the second cumulative flow value.

[0014] Using the cigarette paper tray size values ​​obtained at the start and end of the detection, the change in cigarette paper tray size used to obtain the total number of cigarettes during the detection period is calculated.

[0015] Based on the total amount of adhesive consumed, the change in the size of the cigarette paper tray, the density of the lip glue, and the preset characteristic parameters of the cigarette paper, the amount of lip glue applied to the lip glue of a single cigarette is calculated. The characteristic parameters of the cigarette paper include: the thickness of the cigarette paper and the length of the cigarette paper used in a single cigarette.

[0016] In at least one of the possible implementations, the method for calculating the amount of adhesive applied in conjunction with predetermined production parameters includes:

[0017] The total amount of adhesive consumed during the detection period is calculated using the first cumulative flow value and the second cumulative flow value.

[0018] Based on the total amount of adhesive consumed, the density value of the sealing adhesive, and the production parameters, the amount of sealing adhesive applied to the sealing adhesive of a single cigarette is calculated, wherein the production parameters include: the duration of the detection period and the speed of the cigarette rolling machine.

[0019] In at least one of the possible implementations, the predetermined conditions include: the speed of the cigarette rolling machine is within a preset speed range, and the cigarette paper tray has not been replaced.

[0020] Secondly, the present invention provides a cigarette making unit for performing the aforementioned detection method, comprising: an ultrasonic flow meter externally clamped in a pipeline between the glue supply nozzle and the glue pump transmission mechanism of the cigarette making unit.

[0021] In at least one possible implementation, the ultrasonic flow meter is electrically connected to the original controller of the cigarette production unit or a separately configured computing terminal.

[0022] Compared with existing technologies, the main design concept of this invention lies in acquiring, based on predetermined conditions, the first cumulative flow value of the ultrasonic flow meter clamped in the adhesive pipeline at the start of detection, and the current cigarette paper tray size value; when the cigarette machine unit reaches the preset end of detection, the second cumulative flow value of the ultrasonic flow meter is acquired, and the current cigarette paper tray size value is also acquired; based on the first cumulative flow value, the second cumulative flow value, the pre-acquired adhesive density value, and combined with the cigarette paper tray size values ​​acquired at the start and end of detection, or combined with predetermined production parameters, the amount of adhesive applied to the cigarette paper adhesive is measured. This invention allows for unrestricted detection timing and does not affect normal production rhythm, meeting the need for online real-time detection of adhesive application amount, facilitating dynamic adjustment during production, improving the detection accuracy of adhesive application amount, avoiding the shortcomings of estimating the total number of cigarettes, and better reflecting actual working conditions. Furthermore, it requires no modification to the original cigarette machine unit hardware, significantly improving the detection efficiency of adhesive application amount. Attached Figure Description

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described below with reference to the accompanying drawings, wherein:

[0024] Figure 1 This is a flowchart illustrating the method for detecting the amount of adhesive applied to the joint based on an ultrasonic flow meter, as provided in an embodiment of the present invention.

[0025] Figure 2 This is an assembly diagram of an ultrasonic flow meter provided in an embodiment of the present invention. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] This invention proposes an embodiment of a method for detecting the amount of adhesive applied to the joint of a sealant based on an ultrasonic flow meter. Specifically, as follows: Figure 1 As shown, it includes:

[0028] Step S1: Based on the given conditions, at the start of the detection, obtain the first cumulative flow value of the ultrasonic flow meter clamped in the adhesive pipeline, and obtain the current cigarette paper tray size value.

[0029] Step S2: When the cigarette machine unit reaches the preset detection end time, obtain the second cumulative flow value of the ultrasonic flow meter and obtain the current cigarette paper tray size value.

[0030] Step S3: Based on the first cumulative flow value, the second cumulative flow value, the pre-obtained adhesive density value (which can be measured using a densitometer), and combined with the cigarette paper tray size values ​​obtained at the start and end of the detection, or combined with predetermined production parameters, the amount of adhesive applied to the cigarette paper adhesive is measured.

[0031] The following is a reference example for calculating the amount of adhesive applied in conjunction with the size of the cigarette paper roll:

[0032] Step S31: Calculate the total amount of adhesive consumed during the detection period using the first cumulative flow value and the second cumulative flow value;

[0033] Step S32: Using the cigarette paper tray size values ​​obtained at the start and end times of the detection, calculate the change value of the cigarette paper tray size during the detection period;

[0034] Step S33: Based on the total amount of adhesive consumed, the change in the size of the cigarette paper tray, the density of the lip glue, and the preset characteristic parameters of the cigarette paper, calculate the amount of lip glue applied to the lip glue of a single cigarette. The characteristic parameters of the cigarette paper include: the thickness of the cigarette paper (which can be measured by a paper thickness gauge) and the length of the cigarette paper used in a single cigarette (which can be determined from the process settings).

[0035] Specifically, under normal production conditions of the cigarette machine unit, the first cumulative flow rate V1 of the ultrasonic flow meter at the start of the detection is collected (this flow rate value can be equivalent to the cumulative glue supply volume / capacity value, the same below), and the first indication d1 of the displacement sensor pre-installed at the cigarette paper feeding roller is collected (the displacement sensor can be calibrated to detect the diameter of the cigarette paper tray, that is, in this embodiment, the size of the cigarette paper tray is the diameter, but it is not limited to this); when the end of the detection is reached, the second cumulative flow rate V2 of the ultrasonic flow meter at this time, and the second indication d2 of the aforementioned displacement sensor are obtained. The amount of adhesive consumed during this detection period is V = V2 - V1, and is calculated according to the formula G = 4000ρVhl / (πd1) 2 -πd2 2The amount of adhesive applied to the cigarette paper's edge is calculated as described above. The density ρ of the edge adhesive is measured by a densitometer, the thickness h of the cigarette paper is measured by a paper thickness gauge, and the length l of the cigarette paper used for a single cigarette is a set value (e.g., 59 mm for regular cigarettes, 50 mm for short cigarettes, etc.).

[0036] The derivation process of the formula used in the above embodiments can be referred to as follows: Set the bottom area S of the cigarette paper tray consumed during the detection period as π[(d1 / 2)] 2 -(d2 / 2) 2 The total length of cigarette paper consumed during this period is L = S / h; therefore, the total number of cigarettes produced during this period is M = L / l = S / hl = π[(d1 / 2)] 2 -(d2 / 2) 2 ] / hl; and immediately, the total adhesive mass of a single cigarette during this testing period is G=1000ρV / M, where G is the amount of adhesive applied to the cigarette paper edge of a single cigarette, in mg / cigarette; ρ is the density value of the cigarette paper edge adhesive, in g / ml; V is the volume of edge adhesive consumed during the testing period, in ml; M is the total number of cigarettes produced during the testing period, in cigarettes; 1000 is a unit conversion constant.

[0037] Therefore, we can obtain the aforementioned formula G = 4000ρVhl / (πd1) 2 -πd2 2 ).

[0038] The following is a reference example for calculating the amount of adhesive applied based on given production parameters:

[0039] Step S310: Calculate the total amount of adhesive consumed during the detection period using the first cumulative flow value and the second cumulative flow value;

[0040] Step S320: Based on the total amount of adhesive consumed, the density value of the lip glue, and the production parameters, calculate the amount of lip glue applied to the cigarette paper of a single cigarette, wherein the production parameters include: the duration of the detection period and the speed of the cigarette rolling machine.

[0041] Specifically, at the start of the detection of the adhesive application amount, the first cumulative flow rate V1 of the clamp-on ultrasonic flow meter is collected; at the end of the detection, the second cumulative flow rate V2 of the clamp-on ultrasonic flow meter is collected. The adhesive application amount of the cigarette paper is calculated according to the formula G = 1000ρ(V2-V1) / TN, where G is the adhesive application amount of the cigarette paper (mg / cigarette); ρ is the density of the cigarette paper adhesive (g / ml); V1 is the cumulative flow rate of the clamp-on ultrasonic flow meter at the start of the detection (ml); V2 is the cumulative flow rate of the clamp-on ultrasonic flow meter at the end of the detection (ml); T is the detection duration (min); N is the cigarette machine speed (cigarettes / min); and 1000 is a unit conversion constant. In other words, TN represents the total number of cigarettes produced during the detection period.

[0042] Specifically, the aforementioned conditions can refer to the following: during the testing period, the cigarette making machine maintains normal production status, the speed of the cigarette making machine is stable within the preset speed range, and in addition to abnormal conditions such as non-cigarette strip slippage, conveyor belt speed loss, and paper strip breakage, the condition must also be met without replacing the cigarette paper tray.

[0043] Finally, it should also be noted that the present invention also provides a cigarette making machine that performs the above-described detection method. In the actual implementation of the above embodiments, as follows... Figure 2 As shown, based on the characteristics of the cigarette making machine, the external clamp-on ultrasonic flow meter 4 can be installed on a section of glue tube 2 between the glue pump transmission mechanism 1 (simplified diagram in the figure) and the glue supply nozzle 3. The ultrasonic flow meter is electrically connected to the original controller of the cigarette making machine or an independently configured computing terminal. This implementation method does not require hardware modification of the cigarette making machine, and further improves the convenience and efficiency of detection.

[0044] In summary, the main design concept of this invention is as follows: based on predetermined conditions, at the start of detection, the first cumulative flow value of the ultrasonic flow meter clamped in the adhesive pipeline is obtained, and the current cigarette paper tray size value is also obtained; when the cigarette machine unit reaches the preset end of detection, the second cumulative flow value of the ultrasonic flow meter is obtained, and the current cigarette paper tray size value is also obtained; based on the first cumulative flow value, the second cumulative flow value, the pre-obtained adhesive density value, and combined with the cigarette paper tray size values ​​obtained at the start and end of detection respectively, or combined with predetermined production parameters, the amount of adhesive applied to the cigarette paper adhesive is measured. This invention allows for unrestricted detection timing and does not affect the normal production rhythm, meeting the need for online real-time detection of adhesive application amount, facilitating dynamic adjustment during production, improving the detection accuracy of adhesive application amount, avoiding the shortcomings of estimating the total number of cigarettes, and better reflecting actual working conditions. Furthermore, it requires no modification to the original cigarette machine unit hardware, significantly improving the detection efficiency of adhesive application amount.

[0045] In this embodiment of the invention, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, A and B simultaneously, or B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.

[0046] The above description of the structure, features, and effects of the present invention is based on the embodiments shown in the figures. However, the above are only preferred embodiments of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred methods can be reasonably combined and matched by those skilled in the art to form a variety of equivalent solutions without departing from or changing the design concept and technical effects of the present invention. Therefore, the present invention is not limited to the scope of implementation shown in the figures. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and figures, should be within the protection scope of the present invention.

Claims

1. A method for detecting the amount of adhesive applied to the joint of a joint based on an ultrasonic flow meter, characterized in that, include: During the inspection period, the cigarette making machine maintained normal production status, the speed of the cigarette making machine was stable within the preset speed range, and the cigarette paper tray was not replaced. At the start of the detection, the first cumulative flow value of the ultrasonic flow meter clamped in the adhesive pipeline is obtained, and the current cigarette paper tray size value is obtained. When the cigarette making machine unit reaches the preset detection end time, the second cumulative flow value of the ultrasonic flow meter is obtained, and the current cigarette paper tray size value is obtained. Based on the first cumulative flow value, the second cumulative flow value, the pre-acquired adhesive density value, and the cigarette paper tray size values ​​obtained at the start and end times of the detection, the amount of adhesive applied to the cigarette paper adhesive is measured, specifically including: The first cumulative flow rate V1 of the ultrasonic flow meter at the start of the detection is collected, along with the first reading d1 of the displacement sensor pre-installed at the cigarette paper feed roller. When the detection ends, the second cumulative flow rate V2 of the ultrasonic flow meter and the second reading d2 of the displacement sensor are obtained. The amount of adhesive consumed during this detection period is V = V2 - V1. According to the formula G = 4000ρVhl / (πd1) 2 -πd2 2 The amount of adhesive applied to the cigarette paper overlap is calculated, where the overlap density ρ is measured by a densitometer, the cigarette paper thickness h is measured by a paper thickness gauge, and the length l of cigarette paper used per cigarette is a set value; the displacement sensor is calibrated to detect the diameter of the cigarette paper tray, and the cigarette paper tray size value is the diameter of the cigarette paper tray.

2. A cigarette making machine unit that performs the detection method according to claim 1, characterized in that, include: An ultrasonic flow meter is externally clamped in the pipeline between the glue supply nozzle and the glue pump drive mechanism of the cigarette making unit.

3. The cigarette making machine unit according to claim 2, characterized in that, The ultrasonic flow meter is electrically connected to the original controller of the cigarette machine unit or an independently configured computing terminal.

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