Triacetin online measurement method, device, system, and readable storage medium

Abstract

This invention discloses an online measurement method, device, system, and readable storage medium for triacetin. The method includes: starting a filter rod forming machine, stopping the spraying of triacetin, and collecting the near-infrared spectrum of the dry rod as a reference spectrum; adjusting the filter rod forming machine to a normal spraying state to spray triacetin onto the sample, and collecting the near-infrared spectrum of the sample in real time; using the near-infrared spectrum of triacetin as the target component, and the collected reference spectrum and the near-infrared spectrum of the forming paper (also known as the forming paper) used to wrap the filter rod as background components, calculating the component of the near-infrared spectrum of triacetin in the sample near-infrared spectrum collected under spraying state using a spatial angle measurement method; and calculating the real-time triacetin content by calling a pre-established component-triacetin content relationship model based on the component. This invention can quickly, efficiently, and in real time obtain and calculate the triacetin content in the filter rod.

Description

Technical Field

[0001] This invention relates to the field of filter rod testing, and more particularly to an online method, apparatus, system, and readable storage medium for measuring triacetin. Background Technology

[0002] During filter rod production, a certain amount of triacetin needs to be uniformly added to the cellulose acetate tow to form a network structure between the loosened tows, thus ensuring sufficient hardness after the filter rod cures. In normal production, the target amount of triacetin is generally 6%-10%. Its content in the filter rod directly affects its hardness, pressure drop, and thus its filtration efficiency and the smoking quality of the cigarette. The triacetin content is an important indicator in triacetin quality control. To ensure that the triacetin content in the filter rod meets the process standard requirements, it is necessary to test the triacetin content.

[0003] Currently, the methods for determining the triacetin content in filter rods mainly include offline detection methods such as dry and wet rod weighing, saponification, gas chromatography, and near-infrared (NIR) spectroscopy. These methods require manual offline sampling followed by offline equipment testing, which cannot meet the requirements for real-time online detection in a workshop environment. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an online method, device, system and readable storage medium for measuring triacetylglycerol content in filter rods, which is inefficient due to the need for manual offline sampling in the existing technology.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] On the one hand, an online measurement method for triacetin is constructed, the method comprising:

[0007] Start the filter rod forming machine, turn off the triacetylglycerol spraying, and collect the near-infrared spectrum of the dry rod as a sample as the reference spectrum.

[0008] Adjust the filter rod forming machine to the normal spraying state and spray triacetyl ester into the sample, and collect the near-infrared spectrum of the sample in real time.

[0009] Using the near-infrared spectrum of triacetylglycerol as the target component and the near-infrared spectrum of the collected reference spectrum and the near-infrared spectrum of the forming paper used to wrap the filter rod as the background components, the near-infrared component of triacetylglycerol in the near-infrared spectrum of the sample collected under spraying conditions was calculated by the spatial angle measurement method.

[0010] Based on the component, the real-time triacetylglycerol content is calculated by calling a pre-established component-triacetylglycerol content relationship model.

[0011] Preferably, the method further includes the process of establishing the component-triacetin content relationship model as follows:

[0012] The near-infrared spectrum of the triacetylglycerol and the near-infrared spectral matrix of the forming paper used to wrap the filter rod were measured.

[0013] Start the filter rod forming machine, turn off the triacetylglycerol spraying, and collect the near-infrared spectrum of the dry rod as a sample as the reference spectrum.

[0014] The spraying amount of triacetylglycerol was adjusted at certain intervals between the minimum and maximum spraying amounts. Near-infrared spectral matrices of samples corresponding to different spraying amounts were collected. The triacetylglycerol content matrix of the samples corresponding to the near-infrared spectral matrices was then measured in the laboratory using standard methods.

[0015] Using the near-infrared spectrum of triacetylglycerol as the target component and the near-infrared spectrum of the reference spectrum and the forming paper used to wrap the filter rod as the background components, the component matrix of the near-infrared spectrum of triacetylglycerol in the near-infrared spectrum matrix of the sample collected under spraying conditions was calculated by the spatial angle measurement method.

[0016] Based on the component matrix and the triacetin content matrix measured in the laboratory, a component-triacetin content relationship model was regressed.

[0017] Preferably, the near-infrared spectrum of the forming paper is specifically the near-infrared spectrum obtained by measuring near-infrared light after it passes through two layers of forming paper.

[0018] Preferably, the spatial angle measurement method includes:

[0019] Step 1: Standardize the near-infrared spectral data of the sample collected under spraying conditions to obtain sample data, and set the initial value of the number of cycles to zero;

[0020] Step 2: Subtract the target component from the sample data, multiply by the ratio of the number of cycles to the angle threshold to obtain intermediate data. After superimposing the background component on the intermediate data, calculate the spatial angle with the target component and proceed to Step 3.

[0021] Step 3: If the spatial angle exceeds the angle threshold, the value of the component is determined to be the value of the loop count; if the spatial angle does not exceed the angle threshold, it is determined whether the loop count has reached the upper limit. If it has reached the upper limit, the value of the component is determined to be zero. If it has not reached the upper limit, the loop count is incremented by one and Step 2 is executed again.

[0022] Secondly, an online measurement device for triacetylglycerol is constructed, comprising:

[0023] The data acquisition module is used to acquire the reference spectrum and the near-infrared spectrum of the sample collected in real time when the filter rod forming machine is in normal spraying state. The reference spectrum is the near-infrared spectrum collected with a dry rod as the sample when the filter rod forming machine is started and the triacetyl ester spraying is turned off.

[0024] The component calculation module is used to calculate the near-infrared spectrum component of triacetylglycerol in the near-infrared spectrum of the sample collected under spraying conditions, with the near-infrared spectrum of triacetylglycerol as the target component and the near-infrared spectrum of the collected reference spectrum and the near-infrared spectrum of the forming paper used to wrap the filter rod as the background component, by means of spatial angle measurement.

[0025] The triacetin content calculation module is used to calculate the real-time triacetin content based on the component and by calling a pre-established component-triacetin content relationship model.

[0026] In three aspects, an online triacetylglycerol measuring device is constructed, including a processor and a memory. The memory stores a computer program, which, when executed by the processor, performs the following steps:

[0027] The reference spectrum and the near-infrared spectrum of the sample were collected in real time when the filter rod forming machine was in normal spraying state. The reference spectrum was the near-infrared spectrum of the dry rod as the sample when the filter rod forming machine was started and the triacetyl glycerol spraying was turned off.

[0028] Using the near-infrared spectrum of triacetylglycerol as the target component and the near-infrared spectrum of the collected reference spectrum and the near-infrared spectrum of the forming paper used to wrap the filter rod as the background components, the near-infrared component of triacetylglycerol in the near-infrared spectrum of the sample collected under spraying conditions was calculated by the spatial angle measurement method.

[0029] Based on the component, the real-time triacetylglycerol content is calculated by calling a pre-established component-triacetylglycerol content relationship model.

[0030] In four aspects, a triacetylglycerol measurement system is constructed, including a filter rod forming machine, a near-infrared spectroscopy online measurement device, and the triacetylglycerol online measurement device as described above.

[0031] Five aspects are addressed by constructing a readable storage medium storing a computer program, which, when executed by a processor, performs the following steps:

[0032] The reference spectrum and the near-infrared spectrum of the sample were collected in real time when the filter rod forming machine was in normal spraying state. The reference spectrum was the near-infrared spectrum of the dry rod as the sample when the filter rod forming machine was started and the triacetyl glycerol spraying was turned off.

[0033] Using the near-infrared spectrum of triacetylglycerol as the target component and the near-infrared spectrum of the collected reference spectrum and the near-infrared spectrum of the forming paper used to wrap the filter rod as the background components, the near-infrared component of triacetylglycerol in the near-infrared spectrum of the sample collected under spraying conditions was calculated by the spatial angle measurement method.

[0034] Based on the component, the real-time triacetylglycerol content is calculated by calling a pre-established component-triacetylglycerol content relationship model.

[0035] The online measurement method, apparatus, system, and readable storage medium for triacetin of the present invention have the following beneficial effects: In the filter rod production process, the present invention measures the near-infrared spectrum of the sample in real time online. Based on the online measured spectrum, with the near-infrared spectrum of triacetin as the target component and the near-infrared spectrum of the collected reference spectrum and the forming paper used to wrap the filter rod as the background component, the near-infrared component of triacetin in the near-infrared spectrum of the sample collected under spraying conditions is calculated by spatial angle measurement method. Based on the component, the real-time triacetin content is calculated by calling the pre-established component-triacetin content relationship model. In this way, the triacetin content in the filter rod can be obtained quickly, efficiently, and in real time. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort:

[0037] Figure 1 This is a flowchart of the online measurement method for triacetin in Embodiment 1 of the present invention;

[0038] Figure 2 This is a flowchart of the spatial angle measurement method. Detailed Implementation

[0039] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Typical embodiments of the invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete. It should be understood that the embodiments of the present invention and the specific features thereof are detailed descriptions of the technical solutions of this application, and not limitations thereof. Where there is no conflict, the embodiments of the present invention and the technical features thereof can be combined with each other.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0041] Example 1

[0042] refer to Figure 1 The online measurement method for triacetin of the present invention includes:

[0043] S101: Start the filter rod forming machine, turn off the triacetyl ester spraying, and use a dry rod (a dry rod is a filter rod without triacetyl ester added, that is, a state of towed forming paper) as a sample to collect its near-infrared spectrum as the reference spectrum Bi.

[0044] To improve measurement efficiency, multiple dry rods can be measured simultaneously to obtain multiple reference spectral matrices (B0, B1, B2, ..., Bm). Subsequent steps are performed for each sample. For now, we will only illustrate these steps using the i-th sample as an example. The near-infrared spectrum of the two overlapping layers of the forming paper involved in the i-th sample is denoted as Pi, and the i-th reference spectrum is denoted as Bi. Existing online near-infrared spectroscopy measurement devices can be used to measure the spectrum, performing white and dark reference acquisition, adjusting the appropriate integration time, and obtaining the real-time near-infrared spectrum of the sample. For details, please refer to patent application CN110006843A.

[0045] S102: Adjust the filter rod forming machine to the normal spraying state. Spray triacetin onto the sample and collect the near-infrared spectrum of the sample in real time.

[0046] S103: Using the near-infrared spectrum G of triacetyl ester as the target component, and the near-infrared spectrum Bi of the collected reference spectrum and Pi of the forming paper used to wrap the filter rod as the background components, the near-infrared spectrum component Ki of triacetyl ester in the near-infrared spectrum of the sample collected under spraying conditions is calculated by the spatial angle measurement method.

[0047] refer to Figure 2 The aforementioned spatial angle measurement method includes:

[0048] Step Sa) Standardize the near-infrared spectrum data of the sample collected under spraying conditions to obtain sample data S, and set the initial value of the number of cycles I to zero;

[0049] Step Sb): Subtract the target component from the sample data S, multiply by the ratio of the number of cycles I to the included angle threshold MaxR, to obtain the intermediate data S', i.e., S' = (SG) * I / MaxR;

[0050] Among them, the included angle threshold MaxR is a relatively small value that can be preset, for example, included angle threshold MaxR = -1*e 10 .

[0051] Step Sc): After superimposing the background component on the intermediate data S', calculate the spatial angle R between it and the target component. That is, first calculate S' + Bi + Pi = T, and then calculate the spatial angle R between T and G.

[0052] Step Sd): Determine if the spatial angle R exceeds the angle threshold MaxR. If yes, proceed to step Se; otherwise, proceed to step Sf.

[0053] Step Se): Determine the value of component Ki as the value of the loop count I, then end;

[0054] Step Sf): Determine whether the number of loops I has reached the upper limit N. If it has reached the upper limit, determine that the value of component Ki is zero. If it has not reached the upper limit N, increment the number of loops I by one (i.e., I = I + 1) and then execute step Sb again.

[0055] S104: Based on the component Ki, the real-time triacetylglycerol content is calculated by calling the pre-established component-triacetylglycerol content relationship model C=f(K).

[0056] The component-triacetin content relationship model was established beforehand through experiments, and the specific establishment steps included:

[0057] 1) Measure the near-infrared spectrum G of the triacetin and the near-infrared spectral matrix P of the forming paper used to wrap the filter rod;

[0058] 2) Start the filter rod forming machine, turn off the spraying of triacetylglycerol, and use the dry rod as a sample to collect its near-infrared spectrum as the reference spectrum B0;

[0059] 3) The spraying amount of triacetin was adjusted at certain intervals between the minimum and maximum spraying amounts. Near-infrared spectral matrices A (A1, A2, ..., An) of samples corresponding to different spraying amounts were collected. The triacetin content matrix C (C1, C2, ..., Cn) of the samples corresponding to the near-infrared spectral matrices was then measured in the laboratory using standard methods. In this invention, the triacetin content is based on laboratory measurements. The so-called standard methods refer to various offline methods for measuring triacetin that have been previously used in this field.

[0060] 4) Using the near-infrared spectrum G of triacetyl ester as the target component and the near-infrared spectral matrix P of the reference spectrum B0 and the forming paper used to wrap the filter rod as the background components, the component matrix K (K1, K2, ..., Kn) of the near-infrared spectrum of triacetyl ester in the near-infrared spectral matrix of the sample collected under spraying conditions was calculated by the spatial angle measurement method.

[0061] 5) Based on the component matrix K (K1, K2, ..., Kn) and the triacetin content matrix C (C1, C2, ..., Cn) measured in the laboratory, the component-triacetin content relationship model C = f(K) is regressed.

[0062] After obtaining the component-triacetin content relationship model C=f(K), the real-time triacetin content C=f(Ki) can be calculated based on the component Ki.

[0063] In this embodiment, the near-infrared spectrum of the forming paper is specifically the near-infrared spectrum obtained by passing near-infrared light through two layers of forming paper. For example, the forming paper can be wound into a loop before measurement, or the forming paper can be directly folded into two layers. In other embodiments, the near-infrared spectrum can be obtained by measuring a single layer of forming paper, or by measuring the near-infrared spectrum of more than one layer of forming paper, depending on the actual needs.

[0064] In addition, the near-infrared spectrum mentioned in this embodiment is specifically the near-infrared absorption spectrum.

[0065] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0066] Example 2

[0067] This embodiment discloses an online triacetylglycerol measuring device, comprising:

[0068] The data acquisition module is used to acquire the reference spectrum and the near-infrared spectrum of the sample collected in real time when the filter rod forming machine is in normal spraying state. The reference spectrum is the near-infrared spectrum collected with a dry rod as the sample when the filter rod forming machine is started and the triacetyl ester spraying is turned off.

[0069] The component calculation module is used to calculate the near-infrared spectrum component of triacetylglycerol in the near-infrared spectrum of the sample collected under spraying conditions, with the near-infrared spectrum of triacetylglycerol as the target component and the near-infrared spectrum of the collected reference spectrum and the near-infrared spectrum of the forming paper used to wrap the filter rod as the background component, by means of spatial angle measurement.

[0070] The triacetin content calculation module is used to calculate the real-time triacetin content based on the component and by calling a pre-established component-triacetin content relationship model.

[0071] The functions of each functional module of the device described in the embodiments of the present invention can be specifically implemented according to the methods in the above method embodiments. The specific implementation process can be referred to the relevant descriptions in the above method embodiments, which will not be repeated here.

[0072] The foregoing description relates to various modules. These modules typically include hardware and / or combinations of hardware and software. These modules may also include a computer-readable medium containing instructions (e.g., software instructions) that, when executed by a processor, enable the various functional features of the invention to be performed. Accordingly, unless explicitly required, the scope of the invention is not limited to the specific hardware and / or software features of the modules explicitly mentioned in the embodiments. As a non-limiting example, the invention in embodiments may have its software instructions executed by one or more processors. It should be noted that the various modules described above are divided into these modules for clarity. However, in actual implementation, the boundaries between the various modules may be blurred. For example, any or all functional modules herein may share various hardware and / or software elements. As another example, any and / or all functional modules herein may be wholly or partially implemented by a shared processor executing software instructions. Furthermore, various software sub-modules executed by one or more processors may be shared among the various software modules. Accordingly, unless explicitly required, the scope of the invention is not limited by mandatory boundaries between various hardware and / or software elements.

[0073] Example 3

[0074] This embodiment discloses an online triacetylglycerol measuring device, including a processor and a memory. The memory stores a computer program, which, when executed by the processor, performs the following steps:

[0075] The reference spectrum and the near-infrared spectrum of the sample were collected in real time when the filter rod forming machine was in normal spraying state. The reference spectrum was the near-infrared spectrum of the dry rod as the sample when the filter rod forming machine was started and the triacetyl glycerol spraying was turned off.

[0076] Using the near-infrared spectrum of triacetylglycerol as the target component and the near-infrared spectrum of the collected reference spectrum and the near-infrared spectrum of the forming paper used to wrap the filter rod as the background components, the near-infrared component of triacetylglycerol in the near-infrared spectrum of the sample collected under spraying conditions was calculated by the spatial angle measurement method.

[0077] Based on the component, the real-time triacetylglycerol content is calculated by calling a pre-established component-triacetylglycerol content relationship model.

[0078] The specific implementation process of each step can be referred to the relevant descriptions in the above method embodiments, and will not be repeated here.

[0079] Example 4

[0080] This embodiment discloses a triacetylglycerol measurement system, including a filter rod forming machine, a near-infrared spectroscopy online measurement device, and a triacetylglycerol online measurement device as described in Embodiment 2 or 3.

[0081] Example 5

[0082] This embodiment discloses a readable storage medium storing a computer program, which, when executed by a processor, performs the following steps:

[0083] The reference spectrum and the near-infrared spectrum of the sample were collected in real time when the filter rod forming machine was in normal spraying state. The reference spectrum was the near-infrared spectrum of the dry rod as the sample when the filter rod forming machine was started and the triacetyl glycerol spraying was turned off.

[0084] Using the near-infrared spectrum of triacetylglycerol as the target component and the near-infrared spectrum of the collected reference spectrum and the near-infrared spectrum of the forming paper used to wrap the filter rod as the background components, the near-infrared component of triacetylglycerol in the near-infrared spectrum of the sample collected under spraying conditions was calculated by the spatial angle measurement method.

[0085] Based on the component, the real-time triacetylglycerol content is calculated by calling a pre-established component-triacetylglycerol content relationship model.

[0086] The specific implementation process of each step can be referred to the relevant descriptions in the above method embodiments, and will not be repeated here.

[0087] In summary, the online measurement method, apparatus, system, and readable storage medium for triacetin of the present invention have the following beneficial effects: During the filter rod production process, the present invention measures the near-infrared spectrum of the sample in real time. Based on the online measured spectrum, using the near-infrared spectrum of triacetin as the target component and the near-infrared spectrum of the collected reference spectrum and the forming paper used to wrap the filter rod as the background component, the near-infrared component of triacetin in the near-infrared spectrum of the sample collected under spraying conditions is calculated using a spatial angle measurement method. Based on the component, a pre-established component-triacetin content relationship model is called to calculate the real-time triacetin content. Thus, the triacetin content in the filter rod can be obtained quickly, efficiently, and in real time.

[0088] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A method for online measurement of triacetin, characterized in that, The method includes: Start the filter rod forming machine, turn off the triacetylglycerol spraying, and collect the near-infrared spectrum of the dry rod as a sample as the reference spectrum. Adjust the filter rod forming machine to the normal spraying state and spray triacetyl ester into the sample, and collect the near-infrared spectrum of the sample in real time. Using the near-infrared spectrum of triacetylglycerol as the target component and the near-infrared spectrum of the collected reference spectrum and the near-infrared spectrum of the forming paper used to wrap the filter rod as the background components, the near-infrared component of triacetylglycerol in the near-infrared spectrum of the sample collected under spraying conditions was calculated by the spatial angle measurement method. Based on the component, the real-time triacetylglycerol content is calculated by calling a pre-established component-triacetylglycerol content relationship model; The spatial angle measurement method includes: Step 1: Standardize the near-infrared spectral data of the sample collected under spraying conditions to obtain sample data, and set the initial value of the number of cycles to zero; Step 2: Subtract the target component from the sample data, multiply by the ratio of the number of cycles to the angle threshold to obtain intermediate data. After superimposing the background component on the intermediate data, calculate the spatial angle with the target component and proceed to Step 3. Step 3: If the spatial angle exceeds the angle threshold, the value of the component is determined to be the value of the loop count; if the spatial angle does not exceed the angle threshold, it is determined whether the loop count has reached the upper limit. If it has reached the upper limit, the value of the component is determined to be zero. If it has not reached the upper limit, the loop count is incremented by one and Step 2 is executed again.

2. The online measurement method for triacetin according to claim 1, characterized in that, The method further includes the following process for establishing the component-triacetylglycerol content relationship model: The near-infrared spectrum of the triacetylglycerol and the near-infrared spectral matrix of the forming paper used to wrap the filter rod were measured. Start the filter rod forming machine, turn off the triacetylglycerol spraying, and collect the near-infrared spectrum of the dry rod as a sample as the reference spectrum. The spraying amount of triacetylglycerol was adjusted at certain intervals between the minimum and maximum spraying amounts. Near-infrared spectral matrices of samples corresponding to different spraying amounts were collected. The triacetylglycerol content matrix of the samples corresponding to the near-infrared spectral matrices was then measured in the laboratory using standard methods. Using the near-infrared spectrum of triacetylglycerol as the target component and the near-infrared spectrum of the reference spectrum and the forming paper used to wrap the filter rod as the background components, the component matrix of the near-infrared spectrum of triacetylglycerol in the near-infrared spectrum matrix of the sample collected under spraying conditions was calculated by the spatial angle measurement method. Based on the component matrix and the triacetin content matrix measured in the laboratory, a component-triacetin content relationship model was regressed.

3. The online measurement method for triacetin according to claim 2, characterized in that, The method further includes: the near-infrared spectrum of the forming paper, specifically the near-infrared spectrum obtained by measuring near-infrared light after passing through two layers of forming paper.

4. The online measurement method for triacetin according to claim 1, characterized in that, The near-infrared spectrum specifically refers to the near-infrared absorption spectrum.

5. An online measuring device for triacetin, characterized in that, include: The data acquisition module is used to acquire the reference spectrum and the near-infrared spectrum of the sample collected in real time when the filter rod forming machine is in normal spraying state. The reference spectrum is the near-infrared spectrum collected with a dry rod as the sample when the filter rod forming machine is started and the triacetyl ester spraying is turned off. The component calculation module is used to calculate the near-infrared spectrum component of triacetylglycerol in the near-infrared spectrum of the sample collected under spraying conditions, with the near-infrared spectrum of triacetylglycerol as the target component and the near-infrared spectrum of the collected reference spectrum and the near-infrared spectrum of the forming paper used to wrap the filter rod as the background component, by means of spatial angle measurement. The triacetylglycerol content calculation module is used to calculate the real-time triacetylglycerol content based on the component and by calling a pre-established component-triacetylglycerol content relationship model. The spatial angle measurement method includes: Step 1: Standardize the near-infrared spectral data of the sample collected under spraying conditions to obtain sample data, and set the initial value of the number of cycles to zero; Step 2: Subtract the target component from the sample data, multiply by the ratio of the number of cycles to the angle threshold to obtain intermediate data. After superimposing the background component on the intermediate data, calculate the spatial angle with the target component and proceed to Step 3. Step 3: If the spatial angle exceeds the angle threshold, the value of the component is determined to be the value of the loop count; if the spatial angle does not exceed the angle threshold, it is determined whether the loop count has reached the upper limit. If it has reached the upper limit, the value of the component is determined to be zero. If it has not reached the upper limit, the loop count is incremented by one and Step 2 is executed again.

6. An online measuring device for triacetin, characterized in that, It includes a processor and a memory, the memory storing a computer program that, when executed by the processor, performs the following steps: The reference spectrum and the near-infrared spectrum of the sample were collected in real time when the filter rod forming machine was in normal spraying state. The reference spectrum was the near-infrared spectrum of the dry rod as the sample when the filter rod forming machine was started and the triacetyl glycerol spraying was turned off. Using the near-infrared spectrum of triacetylglycerol as the target component and the near-infrared spectrum of the collected reference spectrum and the near-infrared spectrum of the forming paper used to wrap the filter rod as the background components, the near-infrared component of triacetylglycerol in the near-infrared spectrum of the sample collected under spraying conditions was calculated by the spatial angle measurement method. Based on the component, the real-time triacetylglycerol content is calculated by calling a pre-established component-triacetylglycerol content relationship model; The spatial angle measurement method includes: Step 1: Standardize the near-infrared spectral data of the sample collected under spraying conditions to obtain sample data, and set the initial value of the number of cycles to zero; Step 2: Subtract the target component from the sample data, multiply by the ratio of the number of cycles to the angle threshold to obtain intermediate data. After superimposing the background component on the intermediate data, calculate the spatial angle with the target component and proceed to Step 3. Step 3: If the spatial angle exceeds the angle threshold, the value of the component is determined to be the value of the loop count; if the spatial angle does not exceed the angle threshold, it is determined whether the loop count has reached the upper limit. If it has reached the upper limit, the value of the component is determined to be zero. If it has not reached the upper limit, the loop count is incremented by one and Step 2 is executed again.

7. A triacetin ester measuring system, characterized in that, It includes a filter rod forming machine, a near-infrared spectroscopy online measuring device, and a triacetylglycerol online measuring device as described in claim 5 or 6.

8. A readable storage medium, characterized in that, The system contains a computer program that, when executed by a processor, performs the following steps: The reference spectrum and the near-infrared spectrum of the sample were collected in real time when the filter rod forming machine was in normal spraying state. The reference spectrum was the near-infrared spectrum of the dry rod as the sample when the filter rod forming machine was started and the triacetyl glycerol spraying was turned off. Using the near-infrared spectrum of triacetylglycerol as the target component and the near-infrared spectrum of the collected reference spectrum and the near-infrared spectrum of the forming paper used to wrap the filter rod as the background components, the near-infrared component of triacetylglycerol in the near-infrared spectrum of the sample collected under spraying conditions was calculated by the spatial angle measurement method. Based on the component, the real-time triacetylglycerol content is calculated by calling a pre-established component-triacetylglycerol content relationship model; The spatial angle measurement method includes: Step 1: Standardize the near-infrared spectral data of the sample collected under spraying conditions to obtain sample data, and set the initial value of the number of cycles to zero; Step 2: Subtract the target component from the sample data, multiply by the ratio of the number of cycles to the angle threshold to obtain intermediate data. After superimposing the background component on the intermediate data, calculate the spatial angle with the target component and proceed to Step 3. Step 3: If the spatial angle exceeds the angle threshold, the value of the component is determined to be the value of the loop count; if the spatial angle does not exceed the angle threshold, it is determined whether the loop count has reached the upper limit. If it has reached the upper limit, the value of the component is determined to be zero. If it has not reached the upper limit, the loop count is incremented by one and Step 2 is executed again.

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