A method and device for online determination of dryness of a blasting bead

Abstract

The application discloses a kind of online drying determination methods of blasting bead, for judging whether the blasting bead in revolving cage reaches dry end, revolving cage is used to dry blasting bead, near infrared spectrometer is provided on revolving cage, and near infrared spectrometer can rotate with revolving cage;Online drying determination method of blasting bead includes: using near infrared spectrometer to collect the spectrum of blasting bead in revolving cage;The collected spectrum is handled using moving block standard deviation method, and the average standard deviation of absorbance of each wavelength point in the continuous number of moving block windows is obtained;When the average standard deviation of continuous setting number reaches moving block standard deviation threshold value, then determine that blasting bead reaches dry end.The technical scheme of the application can accurately determine the dry end of blasting bead in time online during the process of drying blasting bead in revolving cage, and ensure the stable quality of blasting bead.The application also provides an online drying determination device of blasting bead.

Description

Technical Field

[0001] This invention relates to the field of popping bead processing, and in particular to a method and apparatus for determining the online drying of popping beads. Background Technology

[0002] In recent years, to enhance the smoking experience of cigarette smokers, capsule cigarette products have seen rapid development. A capsule is a small liquid bead embedded inside the tobacco filter. The capsule contains liquid flavorings of various types, which smokers can pop during smoking, releasing the liquid into the filter fibers. This increases the humidity of the smoke and improves the filter's ability to retain aroma, resulting in a richer, smoother flavor and a more comfortable smoking experience.

[0003] Currently, rotary drying is commonly used in the processing of flavor capsules. While drying, the rotary drying process also shapes the capsules, improving their form and processability. Rotary drying is only the first step, conducted under conditions of specific temperature and humidity and vigorous movement. After drying, the capsules undergo a drying process. During rotary drying, the moisture content of the capsules needs to reach a relatively balanced state, achieving a balance of hardness and toughness for subsequent processing and cigarette production. Insufficient drying increases the burden on the subsequent drying process; over-drying can cause the capsules to burst or crack, affecting further processing.

[0004] Therefore, the rotary drying of capsules is a dynamic process. Relying solely on manual experience or offline moisture detectors cannot provide timely and accurate feedback on the true drying status of the capsules. This can lead to over-drying or under-drying of the capsules, resulting in quality risks after rotary drying and ultimately affecting the quality of capsule cigarettes. Summary of the Invention

[0005] The purpose of this invention is to solve the problem of the inability to provide timely and accurate feedback on the drying status of burst beads during the current rotary drying process, which leads to quality risks. This invention provides an online drying determination method for burst beads, which can accurately and promptly determine the drying endpoint of the burst beads online during the rotary drying process, ensuring stable quality.

[0006] To address the aforementioned technical problems, embodiments of the present invention disclose an online drying determination method for popping beads, used to determine whether popping beads in a rotating drum have reached the drying endpoint. The rotating drum is used to dry the popping beads, and a near-infrared spectrometer is installed on the drum, which rotates with the drum. The online drying determination method for popping beads includes:

[0007] The spectra of the popping beads inside the rotating cage were collected using a near-infrared spectrometer;

[0008] The collected spectra were processed using the moving block standard deviation method to obtain the average standard deviation of absorbance at each wavelength point within a continuous number of moving block windows.

[0009] When the average standard deviation of the continuously set quantity reaches the standard deviation threshold of the moving block, the popping beads are determined to have reached the drying endpoint.

[0010] By employing the above technical solution, a near-infrared spectrometer that rotates with the drum can be installed on the drum to achieve online spectral detection of the popping beads. A moving block standard algorithm is used to calculate the average standard deviation of the continuous moving block window in real time. This continuous average standard deviation is then compared with a set threshold. When the average standard deviation over a sustained period is less than the set threshold, the popping beads are considered to have reached the drying endpoint, and the drum can stop drying. This allows for automatic online judgment of the degree of drying of the popping beads during the drum drying process. The judgment criteria are based on real-time data, ensuring objectivity and accuracy, and guaranteeing the stability of the quality of each batch of popping beads. Simultaneously, timely feedback can prevent over-drying and breakage of the popping beads. Therefore, this embodiment of the technical solution saves manpower and resources while improving the intelligence level of the popping beads in the drum drying process and enhancing the quality of the dried popping beads.

[0011] As a specific implementation of this embodiment, the average standard deviation of the absorbance at each wavelength point within a continuous number of moving block windows is obtained by:

[0012] Set the number of continuous spectra included in the moving block window;

[0013] Calculate the standard deviation of absorbance at each set wavelength point within a moving block window, and the average of the standard deviations of all wavelength points within the moving block window. Use the average of these two values ​​as the average standard deviation of the moving block window.

[0014] Repeat the above process to obtain the average standard deviation of all moving block windows.

[0015] As a specific implementation of this embodiment, when the near-infrared spectrometer is rotated to the first position, it begins to collect the burst bead spectrum; when the near-infrared spectrometer is rotated to the second position, it stops collecting the burst bead spectrum.

[0016] Among them, when the line connecting the center of the measurement window of the near-infrared spectrometer and the center point of the rotating cage is perpendicular to the horizontal direction, the position where the line is offset by a central angle of 45° in the opposite direction of the rotation of the rotating cage is the first position; the position where the line is offset by a central angle of 45° in the opposite direction of the rotation of the rotating cage is the second position.

[0017] By adopting the above technical solution, the effective acquisition time of spectra can be increased, and the amount of spectral data acquired can be guaranteed.

[0018] As a specific implementation of this embodiment, the online drying determination method for popping beads further includes:

[0019] When the rotating drum reaches the set position, the photoelectric switch is triggered to send a collection signal to the near-infrared spectrometer. Based on the collection signal, the near-infrared spectrometer begins to collect the spectrum of the popping beads.

[0020] As a specific implementation of this embodiment, the set position is located in the first position.

[0021] As a specific implementation of this embodiment, the near-infrared spectrometer receives the acquisition signal and begins to acquire the spectrum of the popping beads after a set time interval.

[0022] By adopting the above technical solution, setting an interval between the triggering of the near-infrared spectrometer and the start of detection can make the start detection range more accurate, thus ensuring sufficient acquisition time.

[0023] As a specific implementation of this embodiment, the set position is located within the area from the second position to the first position along the rotation direction of the rotating cage.

[0024] As a specific implementation of this embodiment, the spectral range of the near-infrared spectrometer is 900nm-1700nm.

[0025] As a specific implementation of this embodiment, the light emitted by the near-infrared spectrometer can penetrate to a depth of 10mm-15mm into the popping beads accumulated inside the rotating cage.

[0026] Accordingly, this application also discloses an online drying determination device for popping beads, wherein the popping beads are dried using a rotary drum, and the online drying determination device for popping beads includes:

[0027] The near-infrared spectrometer is mounted on the rotating drum and can rotate with the drum; the near-infrared spectrometer is used to collect the spectrum of the popping beads.

[0028] The processing module is electrically connected to the near-infrared spectrometer and is used to process the spectrum acquired by the near-infrared spectrometer using the moving block standard deviation method to obtain the average standard deviation of the absorbance at each wavelength point within a continuous number of moving block windows.

[0029] The judgment module, electrically connected to the processing module, is used to receive the average standard deviation of each moving block window and compare the average standard deviation with the set drying endpoint judgment parameter to determine whether the popping bead has reached the drying endpoint; wherein, when the average standard deviation of a continuously set number of windows reaches the moving block standard deviation threshold, it is determined that the popping bead has reached the drying endpoint.

[0030] As a specific implementation of this embodiment, the processing module includes:

[0031] The setting unit is used to set the number of continuous spectra included in a moving block window;

[0032] The evaluation unit is used to calculate the standard deviation of absorbance at each set wavelength point within each moving block window, as well as the average of the standard deviations of all wavelength points within the moving block window, and to use the average as the average standard deviation of the moving block window.

[0033] The data transmission unit, connected to the judgment module, is used to send the average standard deviation calculated by the evaluation unit to the judgment module.

[0034] As a specific implementation of this embodiment, when the near-infrared spectrometer is rotated to the first position, it begins to collect the burst bead spectrum; when the near-infrared spectrometer is rotated to the second position, it stops collecting the burst bead spectrum.

[0035] When the line connecting the measurement window of the near-infrared spectrometer to the center point of the rotating drum is perpendicular to the horizontal direction, the position offset by a central angle of 45° relative to the line connecting the two points in the opposite direction of the rotation of the drum is the first position; the position offset by a central angle of 45° relative to the line connecting the two points in the opposite direction of the rotation of the drum is the second position.

[0036] As a specific implementation of this embodiment, a photoelectric switch is also included. The photoelectric switch is electrically connected to the near-infrared spectrometer. When the near-infrared spectrometer rotates to a set position, the photoelectric switch is triggered to send a collection signal to the near-infrared spectrometer. The near-infrared spectrometer can receive the collection signal to start collecting the burst bead spectrum.

[0037] As a specific implementation of this embodiment, the rotating cage is equipped with a slip ring device, which is connected to the near-infrared spectrometer and is used to power the near-infrared spectrometer.

[0038] As a specific implementation of this embodiment, the slip ring device is also provided with a USB interface, which is used to connect to the near-infrared spectrometer for data exchange. Attached Figure Description

[0039] Figure 1 This diagram shows a flowchart of the online drying and determination method for popping beads according to an embodiment of the present invention;

[0040] Figure 2 This diagram illustrates the range of spectra acquired by the near-infrared spectrometer.

[0041] Figure 3 An example graph of the mean standard deviation of Example 1 is shown;

[0042] Figure 4 An example graph of the mean standard deviation of Example 2 is shown;

[0043] Figure 5A schematic diagram showing the relative positions of the near-infrared spectrometer and the photoelectric switch in the online drying determination device for popping beads according to an embodiment of the present invention is shown.

[0044] In the diagram: 100 - rotating cage, 200 - near-infrared spectrometer, 300 - photoelectric switch, 400 - reflector. Detailed Implementation

[0045] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention is presented in conjunction with preferred embodiments, this does not mean that the features of the invention are limited to these embodiments. On the contrary, the purpose of describing the invention in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of the present invention. To provide a deep understanding of the invention, many specific details will be included in the following description. The invention may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of the invention, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0046] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0047] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in during use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0048] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0049] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0050] This invention discloses an online drying and determination method for popping beads, wherein a rotating drum is used to dry the popping beads, and a near-infrared spectrometer is installed on the drum, which rotates with the drum. The near-infrared spectrometer used in this embodiment can be a commercially available mature near-infrared spectrometer, such as a Fourier transform near-infrared spectrometer. Alternatively, it can be a customized instrument utilizing the near-infrared spectroscopy principle, such as a detection device specifically customized for its dimensions, weight, spot size, and spot penetration depth; this embodiment does not impose any limitations. Specifically, the detection window of the near-infrared spectrometer is embedded in the side wall of the rotating drum, and the detection window is flush with the side wall of the installation position on the drum without gaps, ensuring the accuracy of the spectral detection of the popping beads while avoiding bead jamming or sticking.

[0051] Reference Figure 1 The online drying determination method for popping beads includes the following steps:

[0052] S1: Step for collecting the spectrum of popping beads: Use a near-infrared spectrometer to collect the spectrum of popping beads inside the rotating cage.

[0053] For example, refer to Figure 2 In this embodiment, when the near-infrared spectrometer rotates to the first position, it begins to collect the burst bead spectrum; when the near-infrared spectrometer rotates to the second position, it stops collecting the burst bead spectrum. When the line connecting the measurement window of the near-infrared spectrometer and the center point of the rotating drum is perpendicular to the horizontal direction, the position where the line is offset by a central angle of 45° in the opposite direction of the drum's rotation is the first position; the position where the line is offset by a central angle of 45° in the direction of the drum's rotation is the second position. That is, the first position is the vertical line connecting the detection window and the center point, rotated 45 degrees in the opposite direction of the drum's rotation with the center of the drum as the center; the second position is the line rotated 45 degrees in the direction of the drum's rotation. Figure 2 Assuming the rotating cage rotates in the direction of F, the first position is point A1 and the second position is point A2.

[0054] That is, the area where the near-infrared spectrometer rotates to the bottom of the rotating drum, and the area extending 45 degrees forward and backward along the direction of rotation from the bottom (i.e., Figure 2 Spectra are collected within the area covered by region A (shown in the diagram). During processing, this area has the highest accumulation of popping beads due to gravity, making it convenient for the near-infrared spectrometer to collect effective spectral information during the drying process of the popping beads, i.e., enough spectral information to reflect the actual drying conditions. During collection, the near-infrared spectrometer rotates along the F direction with the rotating drum. When the near-infrared spectrometer rotates with the drum to the first position (i.e., point A1), the detection and collection of popping bead spectra begins; when it rotates to the second position (i.e., point A2), the spectral collection stops. The collection area setting in this embodiment can ensure a certain collection time and collect a sufficient amount of popping bead spectra, ensuring the quality of the collected spectral data.

[0055] Furthermore, the near-infrared spectrometer has a spectral range of 900nm-1700nm, which can improve the efficiency of burst bead spectral acquisition within a limited acquisition time.

[0056] S2: The spectral data processing step uses the moving block standard deviation method to process the acquired spectrum and obtain the average standard deviation of the absorbance at each wavelength point within a continuous number of moving block windows.

[0057] Specifically, processing spectral data includes:

[0058] S21: Set the number of continuous spectra included in the moving block window; that is, determine the number of continuous spectra used to calculate the average standard deviation, which is the window width. For example, in this embodiment, n continuous spectra are set as one moving block window, and the value of n is 3 to 5, which can reflect both the overall process and the differences between spectra.

[0059] S22: Calculate the standard deviation of absorbance at each set wavelength point within a moving block window, and the average of the standard deviations of all wavelength points within the moving block window. Use this average as the average standard deviation of the moving block window. The set wavelength points are the wavelengths corresponding to the characteristic peaks primarily used to characterize the drying changes of the burst beads. For example, the absorbance of the moisture peak within a set wavelength range is used to characterize the degree of drying of the burst beads. It should be noted that the specific range of characteristic peaks can vary depending on the actual product characteristics, and this application embodiment does not impose any limitations.

[0060] S23: Move the window to the next position over time to obtain a new window, repeat the above process, and calculate the average standard deviation of all windows in turn.

[0061] Specifically, the mean standard deviation is calculated as follows:

[0062]

[0063] MBSD is the average of the standard deviations of the absorbance at each of the selected m wavelengths; m is the total number of wavelengths selected; i represents the i-th wavelength point, i∈(1,m); SD i To select n continuous spectra, the standard deviation of absorbance at each wavelength is given. Where SD i The calculation method is as follows:

[0064]

[0065] In the above formula, j represents the j-th spectrum, j∈(1,n); A ij Let i be the absorbance of the j-th spectrum at wavelength i. is the average absorbance of all spectra within the moving block window at wavelength point i; n is the number of spectra contained in a moving block window.

[0066] Furthermore, the spectrum can be preprocessed before spectral processing. Preprocessing methods include smoothing, differentiation, standard normal transformation (SNV), vector normalization, etc.

[0067] S3: Judgment Step: When the average standard deviation of a continuously set number of samples reaches the standard deviation threshold, it indicates that the drying endpoint has been reached. Through the above steps of processing spectral data, the average standard deviation of the spectrum over a continuous period of time can be calculated. When the average standard deviation remains below a certain standard deviation threshold for a specified period, it is determined that the popping bead drying has reached its endpoint. The standard deviation threshold is determined based on the minimum average standard deviation used to indicate that the sample has reached the drying endpoint, as determined by near-infrared online detection during the material drying process. Reaching the standard deviation threshold and maintaining it for a certain period indicates that the popping beads have reached a set equilibrium drying state, and the near-infrared spectrometer can issue a discharge signal.

[0068] The technical solution of this embodiment utilizes a near-infrared spectrometer that rotates with the drum to achieve online spectral detection of the popping beads. A moving block standard algorithm is employed to calculate the average standard deviation of the continuous moving block window in real time. This average standard deviation is then compared to a set threshold. When the average standard deviation remains below the threshold for a sustained period, the popping beads are considered to have reached the drying endpoint, and the drum stops drying. This method enables automatic online judgment of the popping bead drying status during the drum drying process, improving the intelligence of the process. Furthermore, the judgment criteria are based on real-time data, ensuring the stability of the quality of each batch of popping beads. Timely feedback prevents over-drying and breakage of the popping beads, replacing manual experience-based judgment and providing objective, accurate, and timely results.

[0069] The drying time varies depending on the type of capsule, washing method, and equipment performance. Generally, relying on experience and estimating the time, the quality of the dried capsules is inconsistent. Furthermore, in mass production of capsules, multiple rotary drum machines exist, making it impossible to guarantee consistent performance across all machines. The online drying determination method for capsules described in this application provides timely and accurate online judgment of drying time, avoiding inconsistencies in capsule drying quality caused by different equipment—that is, avoiding inter-machine differences due to subjective factors. This ensures the stability of the capsules, achieving the effect of saving manpower and resources while improving the quality of the dried capsules.

[0070] The online drying determination method for popping beads also includes:

[0071] S4: Output discharge signal step. When the near-infrared spectrometer detects that the drying endpoint of the popping beads has been reached, the near-infrared spectrometer can send a signal indicating that the drying endpoint has been reached. This signal is transmitted to the control device of the rotating drum via wired or wireless means, controlling the rotating drum to discharge the material and opening the discharge switch in the rotating drum discharge mechanism to discharge the dried popping beads.

[0072] Furthermore, in this embodiment, when collecting the burst bead spectrum, the light from the near-infrared spectrometer can penetrate longitudinally to a depth of 10mm-15mm into the burst bead material accumulated inside the rotating drum. This ensures that the light spot of the near-infrared spectrometer can extend to a certain depth within the burst bead material, enabling the collection of information from the burst beads located inside the material. In other words, the near-infrared spectrometer can collect the spectra of burst beads at different locations from the sidewall of the rotating drum, from the outer edge to the center, ensuring the comprehensiveness of the burst bead spectral data.

[0073] Meanwhile, the light from a near-infrared spectrometer can penetrate about 1 mm into the wall of the popping bead. The wall material thickness of a typical popping bead is generally less than 1 mm. Therefore, using a near-infrared spectrometer to collect the spectrum can both penetrate the popping bead wall material to collect wall material drying information and not penetrate the entire popping bead, thereby reducing the interference of the core material on the wall material drying information and ensuring the accuracy of the information collected on the drying status of the popping bead.

[0074] Furthermore, the online drying determination method for popping beads also includes: when the rotating drum rotates to a set position, a photoelectric switch is triggered to send a collection signal to the near-infrared spectrometer, which then begins collecting the spectra of the popping beads based on the collection signal. That is, the near-infrared spectrometer is activated by a photoelectric switch. Specifically, when the near-infrared spectrometer rotates to the first position along the direction of drum rotation, the photoelectric switch is triggered, sending a detection signal to the near-infrared spectrometer.

[0075] In one specific implementation, the near-infrared spectrometer receives the acquisition signal and, after a set interval, begins scanning and acquiring the spectrum of the popping bead; that is, there is a trigger delay. The trigger delay is the time interval from when the photoelectric switch triggers the near-infrared spectrometer until the popping bead completely covers the detection window of the near-infrared spectrometer, at which point the near-infrared spectrometer begins scanning and acquiring the spectrum. By setting the interval between the near-infrared spectrometer being triggered and the start of detection, the timing of the near-infrared spectrometer's start of acquisition can be made more accurate, ensuring complete coverage of the entire acquisition area and sufficient acquisition time.

[0076] In this method, the set position for the photoelectric switch to send the detection signal is located within the area from the second position to the first position along the rotation direction of the rotating drum, that is, when the near-infrared spectrometer rotates to... Figure 2When the sampled area is outside region A, the photoelectric switch is triggered, sending a sampling signal to the near-infrared spectrometer. The near-infrared spectrometer begins sampling the spectrum after a set interval. During this interval, the near-infrared spectrometer rotates to the first position A1 within sampling region A. Simultaneously, at position A1, the popping beads begin to completely cover the detection window of the near-infrared spectrometer. That is, after receiving the sampling signal, the near-infrared spectrometer waits until enough popping beads have accumulated to cover its detection window before starting to sample the spectra of the popping beads.

[0077] The above technical solution is illustrated by two specific embodiments:

[0078] Set the acquisition parameters of the near-infrared spectrometer to a spectral range of 900nm-1700nm. Measurements are triggered once per revolution of the photoelectric switch, with each revolution taking approximately 4 seconds, resulting in about 15 measurements per minute. The integration time for each measurement is 100ms, and the number of repetitions is 5 (an integration time of 200ms and 2 repetitions, or other parameters, can also be selected, depending on the performance of the near-infrared spectrometer and the actual acquisition conditions).

[0079] Example 1:

[0080] Spectral preprocessing method: first derivative + smoothing.

[0081] Spectral calculation parameters: Select the calculation spectral region 950-1650nm, and the window width is 3 (i.e., one moving block window includes every 3 consecutive spectra).

[0082] Drying endpoint determination: The drying endpoint is defined as a drying time of at least 5 consecutive minutes with a mean standard deviation less than the threshold of 0.00008 (i.e., at least 75 consecutive minutes with a mean standard deviation less than the threshold of 0.00008). The determination process data is as follows: Figure 3 As shown.

[0083] Example 2:

[0084] Spectral preprocessing method: Standard Normal Variable Transform (SNV).

[0085] Spectral calculation parameters: Select the calculation spectral region 950-1650nm, and the window width is 5 (i.e., one moving block window includes 5 continuous spectra).

[0086] Drying endpoint determination: The drying endpoint is defined as a continuous drying time of at least 5 minutes with a mean standard deviation less than the threshold of 0.005 (i.e., at least 75 consecutive times with a mean standard deviation less than the threshold of 0.005). The determination process data is as follows: Figure 4 As shown.

[0087] Accordingly, this invention also discloses an online drying and determining device for popping beads, wherein a rotating drum is used to dry the popping beads. The online drying and determining device for popping beads includes:

[0088] The near-infrared spectrometer 200 is mounted on the rotating drum 100 and can rotate with the drum to collect the spectrum of the popping beads.

[0089] The processing module, electrically connected to the near-infrared spectrometer 200, is used to process the spectra acquired by the near-infrared spectrometer using the moving block standard deviation method to obtain the average standard deviation of the absorbance at each wavelength point within a continuous number of moving block windows.

[0090] The judgment module, electrically connected to the processing module, is used to receive the average standard deviation of each moving block window and compare the average standard deviation with the set drying endpoint judgment parameter to determine whether the popping bead has reached the drying endpoint; wherein, when the average standard deviation of a continuously set number of windows reaches the moving block standard deviation threshold, it is determined that the popping bead has reached the drying endpoint.

[0091] Furthermore, the judgment module is electrically connected to the control device of the rotating drum. When the judgment module determines that the popping beads have reached the drying endpoint, it sends a discharge signal to the control device of the rotating drum.

[0092] Specifically, the processing module includes:

[0093] The setting unit is used to set the number of continuous spectra included in a moving block window.

[0094] The evaluation unit is used to calculate the standard deviation of absorbance at each set wavelength point within each moving block window, as well as the average of the standard deviations of all wavelength points within the moving block window, and to use the average value as the average standard deviation of the moving block window.

[0095] The data transmission unit, connected to the judgment module, is used to send the average standard deviation calculated by the evaluation unit to the judgment module.

[0096] Furthermore, to adapt to the installation conditions of the rotating drum 100, the near-infrared spectrometer 200 in this embodiment is small in size and light in weight, so that it can rotate with the rotating drum 100 to quickly acquire the rapid bursting bead spectrum, and is easy to install. For example, the near-infrared spectrometer 200 has dimensions of 120mm (H) × 210mm (W) × 160mm (D) and weighs less than 4kg.

[0097] For example, the near-infrared spectrometer 200 can be installed at the popping bead discharge end of the rotating drum 100. It can rotate synchronously with the rotating drum 100, ensuring the timeliness and accuracy of collecting the popping bead spectrum, without affecting the feeding and discharging of the popping beads. Specifically, the discharge baffle of the rotating drum 100 has a hollow groove matching the size of the measurement window (i.e., the light source emission position) of the near-infrared spectrometer 200. The near-infrared spectrometer 200 is snapped onto the discharge baffle. The measurement window is flush with the side wall of the discharge baffle of the rotating drum 100 and has no slits, ensuring the accuracy of detecting the spectrum of the popping bead material while avoiding bead jamming or sticking.

[0098] Furthermore, the lens material of the measuring window is sapphire. Sapphire has good light transmittance, low refractive index, and low background noise, while also having a low coefficient of friction to prevent beads from sticking together.

[0099] Furthermore, during the drying process of the popping beads, the near-infrared spectrometer 200 rotates continuously with the rotating drum. When the near-infrared spectrometer 200 rotates to the first position, it begins to collect the spectra of the popping beads; when the near-infrared spectrometer 200 rotates to the second position, it stops collecting the spectra of the popping beads. Specifically, when the line connecting the center point of the near-infrared spectrometer 200 and the center point of the rotating drum 100 is perpendicular to the horizontal direction, the measurement window is aligned with the direction of rotation of the rotating drum 100 (i.e.,...). Figure 2 The first position is located at a central angle 45° off from the line connecting the two points in the opposite direction (F direction). Figure 2 The second position is located at point A1; the position is 45° off the central angle relative to the connecting line along the rotation direction of the rotating cage 100. Figure 2 (At point A2 in the middle). Within this range, the near-infrared spectrometer 200 can collect effective burst bead spectra.

[0100] Furthermore, the online drying determination device for the popping beads also includes a photoelectric switch 300, which is electrically connected to a near-infrared spectrometer 200. When the near-infrared spectrometer 200 rotates to a set position, the photoelectric switch 300 is triggered, sending a collection signal to the near-infrared spectrometer 200, causing the near-infrared spectrometer 200 to begin collecting the spectrum of the popping beads. Furthermore, the photoelectric switch can be a diffuse reflection photoelectric switch, a through-beam photoelectric switch, a slotted photoelectric switch, a fiber optic photoelectric switch, etc.

[0101] like Figure 5As shown, exemplarily, the photoelectric switch 300 diffusely reflects light. The photoelectric switch 300 is fixedly mounted on a frame on one side of the rotating cage 100, and a reflector 400 is mounted on the rotating cage 100. When the reflector 400 rotates with the rotating cage 100 to a set position, the reflector 400 reflects the light from the photoelectric switch 300, thereby triggering the photoelectric switch 300. Upon triggering, the photoelectric switch 300 sends a collection signal to the near-infrared spectrometer 200. The set position for the photoelectric switch 300 to trigger the near-infrared spectrometer 200 is when the near-infrared spectrometer 200 is in a first position.

[0102] Furthermore, the near-infrared spectrometer 200 can set its own acquisition time. After the acquisition is completed, the near-infrared spectrometer 200 will automatically stop acquiring data and wait for the next acquisition to start.

[0103] Alternatively, after receiving the acquisition signal from the photoelectric switch 300, the near-infrared spectrometer 200 begins acquiring spectra after a certain interval, i.e., there is a trigger delay. By adjusting the length of the interval, the start time of acquisition by the near-infrared spectrometer 200 can be made more accurate. In practice, the time interval from when the near-infrared spectrometer 200 receives the acquisition signal from the photoelectric switch 300 to when the popping bead covers the detection window, and when the near-infrared spectrometer 200 begins detection, can also include the signal transmission time of the photoelectric switch 300 and the reaction time of the near-infrared spectrometer 200. For example, the reflector 400 is installed at a position opposite to the near-infrared spectrometer 200 to facilitate the setting of the time interval.

[0104] Furthermore, the rotating cage 100 is equipped with a slip ring device (not shown in the figure) for powering the near-infrared spectrometer 200.

[0105] Specifically, a slip ring is an electrical component that connects and transmits energy and signals to rotating bodies. Based on the transmission medium, slip rings are classified into electrical slip rings, fluid slip rings, and smooth slip rings, and can also be commonly referred to as "rotational connectors" or "rotational connections." Slip rings can be used in any electromechanical system that continuously transmits power and data signals in a 360° rotating manner. They are often called conductive slip rings, brushes, adapters, slip rings, current collectors, rotary joints, current collectors, return rings, commutators, etc. Their principle is to achieve precision transmission of current, data signals, or images and power between two relatively rotating mechanisms.

[0106] Slip rings are typically installed at the center of rotation of equipment and mainly consist of two parts: a rotating part and a stationary part. The rotating part connects to the rotating structure of the equipment and rotates with it, and is called the "rotor." The stationary part connects to the power source of the fixed structure of the equipment and is called the "stator." In this embodiment, the rotor of the electric slip ring is mounted on the rotating cage 100 and connected to the near-infrared spectrometer 200. The stator is connected to the power supply, and the electric slip ring supplies power to the near-infrared spectrometer 200, which rotates with the rotating cage 100.

[0107] Specifically, the slip ring mainly includes a brush and a conductive ring. The brush is made of precious metal alloy material and has a certain elasticity. The brush is in "II" shape and makes symmetrical double contact with the "V" or "concave" groove of the conductive ring. The elastic pressure of the brush and the sliding contact with the groove of the conductive ring are used to transmit signals and current.

[0108] Furthermore, in one specific embodiment of this example, the slip ring device is also provided with a USB interface for transmitting data to the control systems of the near-infrared spectrometer 200 and the rotating cage 100. This avoids the near-infrared spectrometer 200 and the rotating cage control system from becoming entangled during rotation, so as to realize data transmission during rotation. Moreover, by integrating the data transmission function and the power supply function on the slip ring through the USB interface, the device can be simplified and the cost reduced.

[0109] While the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the invention to these descriptions. Various changes in form and detail can be made by those skilled in the art, including several simple deductions or substitutions, without departing from the spirit and scope of the invention.

Claims

1. A method for determining whether popping beads have reached the drying endpoint in an online drying process, wherein the rotating drum is used to dry the popping beads, characterized in that, The rotating cage is equipped with a near-infrared spectrometer and a slip ring device, and the near-infrared spectrometer can rotate with the rotating cage. The slip ring device is connected to the near-infrared spectrometer and is used to power the near-infrared spectrometer. The online drying determination method for the popping beads includes: During the rotation of the rotating cage, the spectrum of the popping beads inside the rotating cage is collected using the near-infrared spectrometer; The collected spectra were processed using the moving block standard deviation method to obtain the average standard deviation of absorbance at each wavelength point within a continuous number of moving block windows. When the average standard deviation of a continuously set number of such beads reaches the moving block standard deviation threshold, it is determined that the popping beads have reached the drying endpoint.

2. The method as described in claim 1, characterized in that, The average standard deviation of absorbance at each wavelength point within a consecutive number of moving block windows includes: Set the number of continuous spectra included in the moving block window; Calculate the standard deviation of absorbance at each set wavelength point within a moving block window, and the average of the standard deviations at all wavelength points within the moving block window, and use the average as the average standard deviation of the moving block window; Repeat the above process to obtain the average standard deviation of all the moving block windows.

3. The method as described in claim 2, characterized in that, When the near-infrared spectrometer is rotated to the first position, it begins to collect the spectrum of the popping beads; when the near-infrared spectrometer is rotated to the second position, it stops collecting the spectrum of the popping beads. Wherein, when the line connecting the center of the measurement window of the near-infrared spectrometer and the center point of the rotating cage is perpendicular to the horizontal direction, the position at which the central angle is offset by 45° relative to the connecting line along the direction of rotation of the rotating cage is the first position; the position at which the central angle is offset by 45° relative to the connecting line along the direction of rotation of the rotating cage is the second position.

4. The method as described in claim 3, characterized in that, The online drying determination method for popping beads also includes: When the near-infrared spectrometer rotates to the set position, the photoelectric switch is triggered to send a collection signal to the near-infrared spectrometer, and the near-infrared spectrometer begins to collect the burst bead spectrum according to the collection signal.

5. The method as described in claim 4, characterized in that, The set position is the first position.

6. The method as described in claim 4, characterized in that, After receiving the acquisition signal, the near-infrared spectrometer begins to acquire the spectrum of the popping bead after a set time interval.

7. The method as described in claim 6, characterized in that, The set position is located within the area from the second position to the first position along the rotation direction of the rotating cage.

8. The method as described in claim 1, characterized in that, The near-infrared spectrometer has a spectral range of 900nm-1700nm.

9. The method as described in claim 1, characterized in that, The light emitted by the near-infrared spectrometer can penetrate the popping beads accumulated inside the rotating cage to a depth of 10mm-15mm.

10. An online drying and determining device for popping beads, wherein the popping beads are dried using a rotary drum, characterized in that, The online drying and determination device for popping beads includes: A near-infrared spectrometer is mounted on the rotating drum and can rotate with the drum; during the rotation of the drum, the near-infrared spectrometer collects the spectrum of the popping beads; The processing module is electrically connected to the near-infrared spectrometer and is used to process the spectrum acquired by the near-infrared spectrometer using the moving block standard deviation method to obtain the average standard deviation of the absorbance at each wavelength point within a continuous number of moving block windows. The judgment module, electrically connected to the processing module, is used to receive the average standard deviation of each moving block window and compare the average standard deviation with the set drying endpoint judgment parameter to determine whether the popping bead has reached the drying endpoint. A slip ring device, which is connected to the near-infrared spectrometer and is used to power the near-infrared spectrometer; When the average standard deviation of a continuously set number of these values ​​reaches the standard deviation threshold of the moving block, it is determined that the popping beads have reached the drying endpoint.

11. The apparatus as claimed in claim 10, characterized in that, The processing module includes: A setting unit is used to set the number of consecutive spectra included in a moving block window; The evaluation unit is used to calculate the standard deviation of absorbance at each set wavelength point within each moving block window, and the average of the standard deviations of all wavelength points in the moving block window, and to use the average value as the average standard deviation of the moving block window. A data transmission unit, connected to the judgment module, is used to send the average standard deviation calculated by the evaluation unit to the judgment module.

12. The apparatus as claimed in claim 11, characterized in that, It also includes a photoelectric switch, which is electrically connected to the near-infrared spectrometer. When the near-infrared spectrometer rotates to a set position, the photoelectric switch is triggered to send a collection signal to the near-infrared spectrometer. The near-infrared spectrometer can receive the collection signal to start collecting the burst bead spectrum.

13. The apparatus as claimed in claim 12, characterized in that, The slip ring device is also provided with a USB interface, which is used to connect to the near-infrared spectrometer for data exchange.

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