Method and device for monitoring tobacco shred material distribution and air pressure fluctuation in fluidized bed based on laser back scattering technology, electronic equipment and storage medium

Abstract

The invention relates to the technical field of tobacco shred material conveying, in particular to a method and device for monitoring tobacco shred material distribution and air pressure fluctuation in a fluidized bed based on a laser back scattering technology, electronic equipment and a storage medium. Preprocessing the laser signal passing through the tobacco shred material in the fluidized bed; constructing a fluidized bed internal tobacco shred material distribution form calculation model and a fluidized bed internal air pressure fluctuation calculation model, and respectively inputting the preprocessed laser digital signals into the fluidized bed internal tobacco shred material distribution form calculation model and the fluidized bed internal air pressure fluctuation calculation model; judging whether the tobacco shred material form distribution in the fluidized bed or the air pressure fluctuation value in the fluidized bed is normal or not based on the fluidized bed tobacco shred material distribution form or the air pressure fluctuation value in the fluidized bed; the problems that due to the fact that an existing monitoring device for air pressure fluctuation in the fluidized bed is greatly influenced by environmental factors, the accuracy of a monitored result is low indirectly, and due to the fact that an existing monitoring device for the distribution form of tobacco shred materials in the fluidized bed is not monitored, the real-time distribution form of the tobacco shred materials in the fluidized bed cannot be mastered indirectly are solved.

Description

Technical Field

[0001] This invention relates to the field of tobacco conveying technology, and in particular to a method, electronic equipment and storage medium for monitoring the distribution and pressure fluctuation of tobacco materials in a fluidized bed based on laser backscattering technology. Background Technology

[0002] As a key piece of equipment for tobacco conveying, the stability of tobacco movement within the fluidized bed directly affects production efficiency and product quality. Currently, in the tobacco cigarette manufacturing process, under the coordination of positive and negative pressure gases within the fluidized bed, the tobacco material is flexibly conveyed upwards along the arc-shaped bed body. For details on the tobacco material conveying process within the fluidized bed, please refer to the attached diagram in the instruction manual. Figure 5 .like Figure 5 As shown, the tobacco material 2 in the fluidized bed of the cigarette making unit is picked up by the needle roller and then moved along the fluidized bed body 1 in the direction shown by arrow 3 under the action of gravity. When the tobacco material moves to the position of the gas 5 in the fluidized bed, the gas blown out by the gas 5 will cause the lighter tobacco material to move forward in the fluidized bed (the pressure of the gas 5 is measured by pressure gauge P1), while the heavier stems will separate downward in the direction shown by 6, completing the first stem separation in the fluidized bed. Then, as the tobacco continues to move forward in the fluidized bed, the negative pressure gas 4 above the fluidized bed has an upward adsorption effect on the forward-conveyed tobacco. The gas pressure is measured by pressure sensor P2. At the bottom of the fluidized bed, there is positive pressure gas 7 that pushes the forward-conveyed tobacco upward (the pressure of positive pressure gas 7 is measured by pressure sensor P4). In the vertical part of the fluidized bed, negative pressure gas 5 in the suction chamber adsorbs the tobacco onto the suction belt (the magnitude of negative pressure gas is measured by pressure sensor P3). The combined effect of these gases causes the tobacco material in the fluidized bed to be flexibly conveyed upward along the fluidized bed. It is evident that the four gases 5, 4, and 7 in the fluidized bed affect the gas pressure inside the fluidized bed, so monitoring the gas pressure fluctuations inside the fluidized bed is very important.

[0003] Currently, pressure fluctuations within a fluidized bed are primarily detected indirectly by conventional pressure sensors such as P1, P2, P3, and P4. While this method can indirectly monitor pressure fluctuations within the fluidized bed, it has the following drawbacks in practical applications: Because the pressure sensors are installed far from the fluidized bed on pipes used to supply gas into or exhaust it, the actual pressure fluctuations detected indirectly by these sensors have a certain margin of error. Furthermore, when using conventional pressure sensors such as P1, P2, P3, and P4 to monitor pressure within the fluidized bed, due to… Conventional pressure sensors such as P1, P2, P3, and P4 are susceptible to interference from environmental factors such as high temperature, high pressure, and tobacco materials, which can affect the accuracy of monitoring results, resulting in lower monitoring accuracy. Furthermore, in addition to these existing drawbacks, the pressure fluctuations of the positive and negative pressure gases within the fluidized bed during tobacco material transport can easily lead to uneven transport and changes in the tobacco material's morphology. This can easily cause tobacco blockage at the air chamber at the fluidized bed outlet, indirectly resulting in unstable cigarette rolling quality. If this occurs, it is necessary to stop the machine to clean the tobacco in the air chamber or frequently adjust the cigarette weight, both of which lead to reduced equipment efficiency and waste of tobacco materials. Therefore, real-time monitoring of the distribution morphology of tobacco materials within the fluidized bed is crucial for improving product quality. Currently, a suitable device for monitoring the distribution morphology of tobacco materials transported in a fluidized bed has not yet been found.

[0004] Therefore, it is necessary to improve and design the monitoring equipment for monitoring air pressure fluctuations and the distribution morphology of tobacco materials in fluidized beds. This is to address the problems that existing monitoring equipment for air pressure fluctuations in fluidized beds is greatly affected by environmental factors, indirectly leading to low accuracy of the monitored results. Additionally, the lack of existing equipment for monitoring the distribution morphology of tobacco materials in fluidized beds indirectly results in the inability to accurately determine the real-time distribution morphology of tobacco materials within the fluidized bed. Summary of the Invention

[0005] The purpose of this invention is to propose a method, electronic device, and storage medium for monitoring the distribution and pressure fluctuations of tobacco materials in a fluidized bed based on laser backscattering technology. Therefore, it is necessary to improve and design monitoring equipment for monitoring pressure fluctuations and the distribution morphology of tobacco materials in a fluidized bed. This addresses the problems of low accuracy in monitoring pressure fluctuations and the lack of equipment specifically designed to monitor the distribution morphology of tobacco materials in a fluidized bed, which are often affected by environmental factors. Furthermore, the current lack of such equipment makes it impossible to accurately determine the real-time distribution morphology of tobacco materials within the fluidized bed.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] This application proposes a method for monitoring the distribution and pressure fluctuation of tobacco materials in a fluidized bed based on laser backscattering technology, comprising the following steps:

[0008] The laser signal after absorption / scattering through the tobacco shreds in the fluidized bed is acquired, and the laser signal after passing through the tobacco shreds in the fluidized bed is preprocessed to obtain the preprocessed laser digital signal.

[0009] A calculation model for the distribution pattern of tobacco materials in a fluidized bed and a calculation model for the air pressure fluctuation in a fluidized bed are constructed. The pre-processed laser digital signal is input into the calculation model for the distribution pattern of tobacco materials in a fluidized bed and the calculation model for the air pressure fluctuation in a fluidized bed, respectively, to obtain the distribution pattern of tobacco materials in a fluidized bed and the values ​​of the air pressure fluctuation in a fluidized bed.

[0010] Based on the distribution pattern of tobacco shreds in the fluidized bed, determine whether the distribution pattern of tobacco shreds in the fluidized bed is normal; if the distribution pattern of tobacco shreds in the fluidized bed is abnormal, issue a warning to the operator while adjusting the rotation speed of the needle roller component that feeds the tobacco shreds into the fluidized bed via the industrial control computer.

[0011] Based on the pressure fluctuation values ​​within the fluidized bed, determine whether the pressure fluctuations within the fluidized bed are normal; if the pressure fluctuations within the fluidized bed are abnormal, issue a warning to the operator while simultaneously adjusting the negative and positive pressure gases on the fluidized bed via the industrial control computer.

[0012] Prior to this, the step of acquiring the laser signal after absorption / scattering by the tobacco shreds within the fluidized bed, and preprocessing the laser signal after it passes through the tobacco material within the fluidized bed to obtain a preprocessed digital laser signal, includes the following steps:

[0013] A laser emitter is installed on the side wall of the conveying zone within the fluidized bed, emitting a laser beam into the tobacco material being conveyed within the fluidized bed. After passing through the tobacco material, the laser beam is received by a laser receiver installed on the other side wall of the conveying zone within the fluidized bed. The laser emitter and laser receiver are symmetrically arranged, with the fluidized bed conveying zone located between them.

[0014] The laser signal after passing through the tobacco material is obtained from the laser receiver that has already received the laser.

[0015] The laser signal after passing through the tobacco material is processed using A / D conversion technology to obtain a preprocessed digital laser signal.

[0016] Prior to this, the construction of the calculation model for the distribution morphology of tobacco materials in the fluidized bed and the calculation model for the air pressure fluctuation in the fluidized bed, by inputting the preprocessed laser digital signal into the calculation models for the distribution morphology of tobacco materials in the fluidized bed and the calculation models for the air pressure fluctuation in the fluidized bed respectively, to obtain the numerical values ​​of the distribution morphology of tobacco materials in the fluidized bed and the air pressure fluctuation in the fluidized bed, includes the following steps:

[0017] The preprocessed laser digital signal is input into the constructed calculation model of tobacco material distribution in the fluidized bed to obtain the distribution pattern of tobacco material in the fluidized bed. The expression of the calculation model of tobacco material distribution pattern in the fluidized bed is as follows:

[0018]

[0019] Where Q represents the flow distribution pattern of tobacco material in the fluidized bed; A represents the cross-sectional area of ​​the fluidized bed; V represents the average velocity of the tobacco material; ρ represents the average concentration of the tobacco material; L represents the propagation path length of the laser in the fluidized bed, which is generally the width of the fluidized bed; α(ρ) represents the absorption coefficient related to the concentration ρ of the tobacco material; β(ρ) represents the scattering coefficient of the laser as it passes through the tobacco material in the fluidized bed; γ(ρ) represents the scattering coefficient of the laser as it passes through the tobacco material in the fluidized bed.

[0020] The preprocessed laser digital signal is input into the constructed fluidized bed pressure fluctuation calculation model to obtain the pressure fluctuation value within the fluidized bed. The expression of the fluidized bed pressure fluctuation calculation model is as follows:

[0021]

[0022] Where I is the intensity of the laser digital signal after passing through the fluidized bed tobacco material; I0 is the initial intensity of the laser digital signal, that is, the initial intensity before the laser passes through the tobacco material; σ is the extinction coefficient; P is the air pressure in the fluidized bed; P0 is the air pressure at room temperature; ρ0 is the density of the tobacco material at room temperature; and L is the propagation path length of the laser in the fluidized bed, which is generally the width of the fluidized bed.

[0023] Prioritizes determining whether the distribution of tobacco shreds in the fluidized bed is normal based on the distribution morphology of the tobacco shreds in the fluidized bed; if the distribution morphology of the tobacco shreds in the fluidized bed is abnormal, an early warning is issued to the operator, and the rotation speed of the needle roller component that feeds the tobacco shreds into the fluidized bed is adjusted accordingly via the industrial control computer, including the following steps:

[0024] The distribution pattern of tobacco shreds in fluidized bed was compared with that of normal tobacco shreds; the distribution pattern of normal tobacco shreds is that the tobacco shreds are evenly distributed in the fluidized bed conveying zone.

[0025] If the distribution pattern of tobacco shreds in the fluidized bed matches the normal distribution pattern of tobacco shreds, then the distribution pattern of tobacco shreds in the fluidized bed is normal.

[0026] If the distribution pattern of tobacco shreds in the fluidized bed is denser or more sparser than the normal distribution pattern, then the distribution pattern of tobacco shreds in the fluidized bed is abnormal.

[0027] If the distribution pattern of tobacco shreds in the fluidized bed is abnormal, the system will simultaneously issue a warning to the operator via the display and show the abnormal distribution pattern of the tobacco shreds, while the industrial control computer will adjust the rotation speed of the needle roller component used to feed the tobacco shreds into the fluidized bed accordingly.

[0028] When the distribution of tobacco shreds in the fluidized bed is normal, the display shows the operator the normal distribution of tobacco shreds at this time, but does not adjust the rotation speed of the needle roller component used to feed the tobacco shreds into the fluidized bed.

[0029] Prioritize that, in the event of an abnormal distribution of tobacco material within the fluidized bed, the system simultaneously issues a warning to the operator via a display and shows the current abnormal distribution pattern of the tobacco material. Simultaneously, the industrial control computer adjusts the rotational speed of the needle roller component used to feed the tobacco material into the fluidized bed, including the following steps:

[0030] If the distribution of tobacco shreds in the fluidized bed is deemed abnormal due to its denser distribution compared to the normal distribution, the system will simultaneously warn and display the abnormal distribution of tobacco shreds to the operator, and reduce the speed of the needle roller component that feeds the tobacco shreds into the fluidized bed via the industrial control computer to control the amount of tobacco shreds input into the fluidized bed.

[0031] If the distribution of tobacco shreds in the fluidized bed is deemed abnormal due to its more dispersed shape compared to the normal distribution, the system will simultaneously issue a warning to the operator and display the abnormal distribution pattern of the tobacco shreds. At the same time, the speed of the needle roller component that feeds the tobacco shreds into the fluidized bed will be increased via the industrial control computer to control the amount of tobacco shreds input into the fluidized bed.

[0032] Prioritizes determining whether the pressure fluctuation within the fluidized bed is normal based on the pressure fluctuation value within the fluidized bed; if the pressure fluctuation within the fluidized bed is abnormal, a warning is issued to the operator while the negative pressure gas and positive pressure gas on the fluidized bed are adjusted accordingly via the industrial control computer, including the following steps:

[0033] Compare the air pressure fluctuation value in the fluidized bed with the preset air pressure fluctuation range threshold;

[0034] If the air pressure fluctuation value in the fluidized bed is within the preset air pressure fluctuation range threshold, then the air pressure fluctuation in the fluidized bed is normal.

[0035] If the air pressure fluctuation value in the fluidized bed is not within the preset air pressure fluctuation range threshold, then the air pressure fluctuation in the fluidized bed is abnormal.

[0036] When the gas pressure fluctuation in the fluidized bed is abnormal, the system will simultaneously issue a warning to the operator and display the abnormal gas pressure fluctuation value on the monitor, while the industrial control computer will make corresponding adjustments to the negative and positive pressure gas in the fluidized bed.

[0037] When the gas pressure fluctuation in the fluidized bed is normal, the system will simultaneously issue warnings to the operators via the display and show the normal distribution of tobacco materials, while the industrial control computer will make corresponding adjustments to the negative and positive pressure gases in the fluidized bed.

[0038] Prioritize that, in the event of abnormal gas pressure fluctuations within the fluidized bed, the system simultaneously issues a warning to the operator via a display and shows the abnormal gas pressure fluctuation value, while simultaneously adjusting the negative and positive pressure gases within the fluidized bed via an industrial control computer, including the following steps:

[0039] If the air pressure fluctuation in the fluidized bed is judged to be abnormal because it exceeds the air pressure fluctuation range threshold, the operator will be alerted and the abnormal air pressure fluctuation value will be displayed on the monitor. At the same time, the solenoid valve on the air pipe that inputs air into the fluidized bed and another solenoid valve on another air pipe that inputs air into the fluidized bed will be controlled by the industrial control computer to perform corresponding actions, thereby indirectly adjusting the air pressure fluctuation in the fluidized bed to within the preset air pressure fluctuation range threshold.

[0040] If the air pressure fluctuation in the fluidized bed is judged to be abnormal because it is less than the air pressure fluctuation range threshold, the operator will be alerted and the abnormal air pressure fluctuation value will be displayed on the monitor. At the same time, the solenoid valve on the air pipe that inputs air into the fluidized bed and another solenoid valve on another air pipe that outputs air into the fluidized bed will be controlled by the industrial control computer to make corresponding adjustment actions, thereby indirectly adjusting the air pressure fluctuation in the fluidized bed to within the preset air pressure fluctuation range threshold.

[0041] This application proposes a device for monitoring the distribution of tobacco materials and pressure fluctuations in a fluidized bed based on laser backscattering technology in a second aspect, comprising:

[0042] The laser signal acquisition / preprocessing module is used to acquire the laser signal after it is absorbed / scattered by the tobacco shreds passing through the fluidized bed, and to preprocess the laser signal after it passes through the tobacco shreds in the fluidized bed to obtain the preprocessed laser digital signal.

[0043] The module for calculating the distribution pattern of tobacco materials in a fluidized bed and the numerical calculation of air pressure fluctuations in a fluidized bed is used to construct calculation models for the distribution pattern of tobacco materials in a fluidized bed and the numerical calculation models for air pressure fluctuations in a fluidized bed. The pre-processed laser digital signal is input into the calculation models for the distribution pattern of tobacco materials in a fluidized bed and the numerical calculation models for air pressure fluctuations in a fluidized bed, respectively, to obtain the numerical values ​​for the distribution pattern of tobacco materials in a fluidized bed and the numerical values ​​for air pressure fluctuations in a fluidized bed.

[0044] The fluidized bed tobacco material distribution morphology judgment module is used to determine whether the tobacco material distribution morphology in the fluidized bed is normal based on the distribution morphology of the tobacco material in the fluidized bed; if the tobacco material distribution morphology in the fluidized bed is abnormal, it will issue a warning to the operator and adjust the speed of the needle roller component that feeds the tobacco material into the fluidized bed accordingly through the industrial control computer.

[0045] The fluidized bed gas pressure fluctuation judgment module is used to determine whether the gas pressure fluctuation in the fluidized bed is normal based on the gas pressure fluctuation value in the fluidized bed; if the gas pressure fluctuation in the fluidized bed is abnormal, it will issue a warning to the operator and make corresponding adjustments to the negative pressure gas and positive pressure gas in the fluidized bed through the industrial control computer.

[0046] This application proposes an electronic device in a third aspect, including...

[0047] One or more processors;

[0048] A memory for storing one or more programs; when one or more programs are executed by one or more processors, the one or more processors implement a method for monitoring the distribution of tobacco materials and air pressure fluctuations in a fluidized bed based on laser backscattering technology.

[0049] In its fourth aspect, this application proposes a computer-readable storage medium storing computer instructions for causing a processor to execute a method for monitoring the distribution of tobacco materials and air pressure fluctuations in a fluidized bed based on laser backscattering technology.

[0050] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0051] 1. The method for monitoring the distribution and pressure fluctuation of tobacco materials in a fluidized bed based on laser backscattering technology in this invention first acquires the laser signal after absorption / scattering through the tobacco materials in the fluidized bed. The laser signal after passing through the tobacco materials in the fluidized bed is preprocessed to obtain a preprocessed digital laser signal. Then, a calculation model for the distribution morphology of the tobacco materials in the fluidized bed and a calculation model for pressure fluctuations in the fluidized bed are constructed. The preprocessed digital laser signal is input into these two models respectively to obtain the distribution morphology of the tobacco materials in the fluidized bed and the numerical values ​​of pressure fluctuations in the fluidized bed. Next, based on the distribution morphology of the tobacco materials in the fluidized bed, it is determined whether the morphology distribution is normal. If the distribution morphology is abnormal, an early warning is issued to the operator, and the rotation speed of the needle roller component that feeds the tobacco materials into the fluidized bed is adjusted accordingly via the industrial control computer. Finally, based on the pressure fluctuations in the fluidized bed... The system uses dynamic values ​​to determine whether the air pressure fluctuations within the fluidized bed are normal. If the air pressure fluctuations are abnormal, it simultaneously alerts the operator and adjusts the negative and positive pressure gases on the fluidized bed via the industrial control computer. This allows for real-time and accurate monitoring of the morphological distribution of tobacco materials and air pressure fluctuations within the fluidized bed. It also provides timely warnings and adjustments when the morphological distribution or air pressure fluctuations are abnormal, ensuring efficient and stable flexible conveying of tobacco materials within the fluidized bed. This indirectly improves the quality and consistency of rolled products, addressing the problems of low accuracy in monitoring air pressure fluctuations and the lack of monitoring equipment for the real-time distribution of tobacco materials within the fluidized bed.

[0052] 2. The method for monitoring the distribution of tobacco materials and pressure fluctuations in a fluidized bed based on laser backscattering technology in this invention uses laser technology that is non-contact with the tobacco materials. This technology is not only applicable to monitoring tobacco materials in fluidized beds of different types and sizes, but also has higher precision and avoids interference from factors such as high temperature, high pressure and tobacco materials, thereby indirectly improving the accuracy of monitoring results. Attached Figure Description

[0053] Figure 1 This is a flowchart of the method for monitoring the distribution of tobacco materials and air pressure fluctuations in a fluidized bed based on laser backscattering technology in this invention.

[0054] Figure 2 This is a schematic diagram of the installation of the laser emitter, laser receiver, and fluidized bed in this invention.

[0055] Figure 3This is a schematic diagram of the structure of the monitoring device for the distribution of tobacco materials and air pressure fluctuations in a fluidized bed based on laser backscattering technology in this invention.

[0056] Figure 4 This is a schematic diagram of the structure of an electronic device according to the present invention.

[0057] Figure 5 This is a schematic diagram showing the installation of the fluidized bed and the device for monitoring air pressure fluctuations within the fluidized bed in this invention. Detailed Implementation

[0058] like Figure 1-5 As shown, to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0059] Example 1

[0060] Figure 1 A flowchart of a method for monitoring the distribution and pressure fluctuations of tobacco materials in a fluidized bed based on laser backscattering technology is provided for Embodiment 1 of the present invention. This embodiment is applicable to real-time monitoring of pressure fluctuations and the distribution morphology of tobacco materials in a fluidized bed during the conveying process of tobacco materials. This method can be executed by a device for monitoring the distribution and pressure fluctuations of tobacco materials in a fluidized bed based on laser backscattering technology. This device can be implemented in hardware and / or software and can be configured in an electronic device with data processing capabilities. Figure 1 As shown, the method includes:

[0061] S110. Acquire the laser signal after absorption / scattering by the tobacco shreds passing through the fluidized bed. Preprocess the laser signal after passing through the tobacco shreds in the fluidized bed to obtain a preprocessed digital laser signal, as follows:

[0062] (1) A laser is emitted into the tobacco material conveyed in the fluidized bed by a laser emitter located on the side wall of the conveying zone. After passing through the tobacco material, the laser is received by a laser receiver located on the other side wall of the conveying zone. The laser emitter and the laser receiver are symmetrically arranged (see [reference]). Figure 2 The area between the laser emitter and the laser receiver is a fluidized bed transport zone;

[0063] The working principle of tobacco material being transported in a fluidized bed is as follows: Figure 5As shown, the tobacco material 2 in the fluidized bed of the cigarette making unit is picked up by the needle roller and then moved along the fluidized bed body 1 in the direction shown by arrow 3 under the action of gravity. When the tobacco material moves to the position of the gas 5 in the fluidized bed, the gas blown out by the gas 5 will cause the lighter tobacco material to move forward in the fluidized bed (the pressure of the gas 5 is measured by pressure gauge P1), while the heavier stems are separated downward in the direction shown by 6, completing the first stem separation in the fluidized bed. Then, as the tobacco continues to move forward in the fluidized bed, there is a negative pressure gas 4 above the fluidized bed that has an upward adsorption effect on the forward-conveyed tobacco (the gas pressure is measured by pressure sensor P2). There is a positive pressure gas 7 at the bottom of the fluidized bed that has an upward effect on the forward-conveyed tobacco (the gas pressure of the positive pressure gas 7 is measured by pressure sensor P4). In the vertical part of the fluidized bed, the tobacco is adsorbed onto the suction belt by the negative pressure gas 5 in the suction chamber (the negative pressure gas is measured by pressure sensor P3). The combined action of the above gases makes the tobacco material in the fluidized bed flexibly conveyed upward along the fluidized bed.

[0064] The laser emitter and laser receiver are both existing technologies, and no improvements or designs have been made to them. Therefore, their structures will not be described in detail.

[0065] (2) Obtain the laser signal after passing through the tobacco material from the laser receiver that has received the laser;

[0066] The laser signal passing through the tobacco material can be understood as the laser passing through the tobacco material being transported in the fluidized bed conveying zone.

[0067] (3) The laser signal after passing through the tobacco material is processed by A / D conversion technology to obtain the pre-processed laser digital signal.

[0068] Among them, A / D conversion technology is an existing technology. It converts the laser signal after passing through the tobacco material into a digital laser signal so that the subsequent calculation model of the distribution pattern of the tobacco material in the fluidized bed and the calculation model of the air pressure fluctuation in the fluidized bed can perform calculations on the digital laser signal.

[0069] This technical solution acquires the laser signal after it has been absorbed / scattered by the tobacco shreds in the fluidized bed, and then preprocesses the laser signal after it has passed through the tobacco material in the fluidized bed to obtain a preprocessed digital laser signal. In this way, the non-contact laser technology is not only applicable to the monitoring of tobacco materials in fluidized beds of different types and sizes, but also has higher accuracy and avoids the influence of factors such as high temperature, high pressure and tobacco material, thus indirectly improving the accuracy of the monitoring results.

[0070] S120. Construct calculation models for the distribution morphology of tobacco materials in the fluidized bed and the pressure fluctuation in the fluidized bed. Input the preprocessed laser digital signal into the calculation models for the distribution morphology of tobacco materials in the fluidized bed and the pressure fluctuation in the fluidized bed, respectively, to obtain the values ​​of the distribution morphology of tobacco materials in the fluidized bed and the pressure fluctuation in the fluidized bed, as detailed below:

[0071] (1) Input the preprocessed laser digital signal into the constructed calculation model of tobacco material distribution in the fluidized bed to obtain the distribution pattern of tobacco material in the fluidized bed. The expression of the calculation model of tobacco material distribution pattern in the fluidized bed is as follows:

[0072]

[0073] Where Q represents the flow distribution pattern of tobacco material in the fluidized bed; A represents the cross-sectional area of ​​the fluidized bed; V represents the average velocity of the tobacco material; ρ represents the average concentration of the tobacco material; L represents the propagation path length of the laser in the fluidized bed, which is generally the width of the fluidized bed; α(ρ) represents the absorption coefficient related to the concentration ρ of the tobacco material; β(ρ) represents the scattering coefficient of the laser as it passes through the tobacco material in the fluidized bed; γ(ρ) represents the scattering coefficient of the laser as it passes through the tobacco material in the fluidized bed.

[0074] (2) Input the preprocessed laser digital signal into the constructed fluidized bed pressure fluctuation calculation model to obtain the pressure fluctuation value in the fluidized bed. The expression of the fluidized bed pressure fluctuation calculation model is as follows:

[0075]

[0076] Where I is the intensity of the laser digital signal after passing through the fluidized bed tobacco material; I0 is the initial intensity of the laser digital signal, that is, the initial intensity before the laser passes through the tobacco material; σ is the extinction coefficient; P is the air pressure in the fluidized bed; P0 is the air pressure at room temperature; ρ0 is the density of the tobacco material at room temperature; and L is the propagation path length of the laser in the fluidized bed, which is generally the width of the fluidized bed.

[0077] This technical solution constructs a calculation model for the distribution morphology of tobacco materials in a fluidized bed and a calculation model for air pressure fluctuations in a fluidized bed. The converted laser digital signal can be input into these two models respectively to obtain the distribution morphology of tobacco materials in the fluidized bed and the values ​​of air pressure fluctuations in the fluidized bed. This provides data support for subsequent judgments on whether the distribution morphology of tobacco materials in the fluidized bed and the values ​​of air pressure fluctuations in the fluidized bed are normal.

[0078] S130. Based on the distribution morphology of the tobacco shreds in the fluidized bed, determine whether the morphology distribution of the tobacco shreds in the fluidized bed is normal; if the morphology distribution of the tobacco shreds in the fluidized bed is abnormal, while simultaneously issuing a warning to the operator, the industrial control computer will adjust the rotation speed of the needle roller component that feeds the tobacco shreds into the fluidized bed accordingly, as follows:

[0079] (1) Compare the distribution pattern of fluidized bed tobacco with that of normal tobacco.

[0080] The normal distribution pattern of tobacco shreds can be understood as the uniform distribution of tobacco shreds in the fluidized bed conveying zone;

[0081] (2) If the distribution pattern of tobacco shreds in the fluidized bed matches the normal distribution pattern of tobacco shreds, then the distribution pattern of tobacco shreds in the fluidized bed is normal.

[0082] The fact that the distribution pattern of tobacco shreds in the fluidized bed matches the distribution pattern of normal tobacco shreds can be understood as the current distribution pattern of tobacco shreds in the fluidized bed being similar to the distribution pattern of normal tobacco shreds; the distribution pattern of normal tobacco shreds can be understood as the tobacco shreds being distributed very evenly in the conveying zone of the fluidized bed.

[0083] (3) If the distribution pattern of tobacco shreds in the fluidized bed is denser or more sparser than the normal distribution pattern of tobacco shreds, then the distribution pattern of tobacco shreds in the fluidized bed is abnormal.

[0084] (4) If the distribution pattern of tobacco shreds in the fluidized bed is abnormal, the system will issue a warning to the operator and display the abnormal distribution pattern of tobacco shreds on the display screen, while adjusting the rotation speed of the needle roller component used to feed tobacco shreds into the fluidized bed through the industrial control computer.

[0085] In cases where the distribution of tobacco shreds within the fluidized bed is abnormal, a warning is simultaneously issued to the operator via a display showing the abnormal distribution. Simultaneously, the industrial control computer adjusts the rotation speed of the needle roller component (located at the fluidized bed inlet, primarily used to feed tobacco shreds from the storage bin into the fluidized bed) to control the entry of tobacco shreds into fluidized bed 1. Input quantity; wherein, the needle roller component includes a feeding shaft, feeding columns, and a motor; the feeding shaft is located at the outlet of the tobacco storage box and the fluidized bed inlet, and both ends of the feeding shaft are rotatably connected to the side walls of the fluidized bed inlet. Feeding columns are spaced out on the outer wall of the feeding shaft, and one end of the feeding shaft extends out of the side wall of the fluidized bed inlet and is connected to the motor. The speed of the needle roller component is reduced to control the amount of tobacco material input into the fluidized bed; if the distribution of tobacco material in the fluidized bed is judged to be abnormal due to its sparser distribution compared to the normal distribution, the operator is alerted and the abnormal distribution of tobacco material is displayed. At the same time, the speed of the needle roller component feeding tobacco material into the fluidized bed is increased by the industrial control computer to control the amount of tobacco material input into the fluidized bed.

[0086] This technical solution determines whether the distribution of tobacco shreds in the fluidized bed is normal based on the distribution pattern of the tobacco shreds. If the distribution pattern is abnormal, an alert is sent to the operator, and the rotation speed of the needle roller component that feeds the tobacco shreds into the fluidized bed is adjusted accordingly via the industrial control computer. This allows for real-time and accurate monitoring of the tobacco shred distribution pattern in the fluidized bed. It also provides alerts and adjustments when the distribution pattern is abnormal, ensuring efficient and stable flexible conveying of the tobacco shreds in the fluidized bed, thereby indirectly improving the quality and consistency of the rolled products.

[0087] (5) When the distribution of tobacco shreds in the fluidized bed is normal, the display will show the operator the distribution of normal tobacco shreds at this time, but the rotation speed of the needle roller component used to feed tobacco shreds into the fluidized bed will not be adjusted accordingly.

[0088] The display is existing technology and has not been improved or designed, so its structure will not be described in detail.

[0089] S140. Based on the pressure fluctuation values ​​within the fluidized bed, determine whether the pressure fluctuations are normal. If the pressure fluctuations are abnormal, issue a warning to the operator while simultaneously adjusting the negative and positive pressure gases on the fluidized bed via the industrial control computer, as follows:

[0090] (1) Compare the gas pressure fluctuation value in the fluidized bed with the preset gas pressure fluctuation range threshold;

[0091] The preset air pressure fluctuation range threshold can be understood as ensuring that the tobacco material in the fluidized bed can be transported stably and maintain a uniform transport posture during the transport process.

[0092] (2) If the gas pressure fluctuation value in the fluidized bed is within the preset gas pressure fluctuation range threshold, then the gas pressure fluctuation in the fluidized bed is normal.

[0093] Among them, the pressure fluctuation value in the fluidized bed within the preset pressure fluctuation range threshold can be understood as the pressure fluctuation in the fluidized bed falling within the preset pressure fluctuation range threshold.

[0094] (3) If the pressure fluctuation value in the fluidized bed is not within the preset pressure fluctuation range threshold, then the pressure fluctuation in the fluidized bed is abnormal.

[0095] Among them, the pressure fluctuation value in the fluidized bed not being within the preset pressure fluctuation range threshold can be understood as the pressure fluctuation value in the fluidized bed being greater than the preset pressure fluctuation range threshold and the pressure fluctuation value in the fluidized bed being less than the preset pressure fluctuation range threshold.

[0096] (4) When the gas pressure fluctuation in the fluidized bed is abnormal, the system will issue a warning to the operator and display the abnormal gas pressure fluctuation value on the display, while the system will adjust the negative pressure gas and positive pressure gas in the fluidized bed accordingly through the industrial control computer.

[0097] In cases where the air pressure fluctuation within the fluidized bed is abnormal, the system simultaneously alerts the operator via a display and shows the abnormal pressure fluctuation value. Simultaneously, the industrial control computer adjusts the negative and positive pressure gases within the fluidized bed accordingly. Specifically, if the air pressure fluctuation within the fluidized bed exceeds the pressure fluctuation range threshold and is deemed abnormal, the system simultaneously alerts the operator via a display and shows the abnormal pressure fluctuation value. Simultaneously, the industrial control computer controls the solenoid valve on the air pipe that supplies air to the fluidized bed and controls another gas pipe used for supplying air to the fluidized bed. Another solenoid valve on the pipe operates accordingly, indirectly adjusting the air pressure fluctuation within the fluidized bed to within a preset air pressure fluctuation range threshold. If the air pressure fluctuation within the fluidized bed is judged to be abnormal because it is less than the air pressure fluctuation range threshold, a warning is issued to the operator via the display screen, showing the abnormal air pressure fluctuation value. Simultaneously, the industrial control computer controls the solenoid valve on the air pipe that inputs air into the fluidized bed and another solenoid valve on the other air pipe that outputs air into the fluidized bed to perform corresponding adjustment actions, indirectly adjusting the air pressure fluctuation within the fluidized bed to within the preset air pressure fluctuation range threshold. It should be noted that both the air pipe that inputs air into the fluidized bed and the other air pipe that outputs air into the fluidized bed are embedded in the fluidized bed, with their outlet ends located within the fluidized bed. The air pipe that inputs air into the fluidized bed is connected to the air compressor's delivery end; the other air pipe that outputs air into the fluidized bed is connected to the air compressor's output end.

[0098] (6) When the gas pressure fluctuation in the fluidized bed is normal, the system will issue a warning to the operator and display the normal distribution of tobacco material on the display screen, while adjusting the negative pressure gas and positive pressure gas in the fluidized bed through the industrial control computer.

[0099] The monitor and industrial computer are existing technologies, and no improvements or designs have been made to them. Therefore, their structures will not be described in detail.

[0100] This technical solution determines whether the air pressure fluctuations within the fluidized bed are normal based on the numerical values ​​of the air pressure fluctuations. If the air pressure fluctuations are abnormal, an early warning is issued to the operator, and the negative and positive pressure gases on the fluidized bed are adjusted accordingly via the industrial control computer. In this way, not only can the air pressure fluctuations within the fluidized bed be monitored accurately in real time, but also timely warnings and adjustments can be made when the air pressure fluctuations are abnormal, thereby ensuring the efficient and stable flexible conveying of tobacco materials within the fluidized bed, indirectly improving the quality and consistency of the rolled products.

[0101] The technical solution of this application embodiment first acquires the laser signal after absorption / scattering of tobacco shreds passing through the fluidized bed. The laser signal after passing through the tobacco material in the fluidized bed is preprocessed to obtain a preprocessed digital laser signal. Then, a calculation model for the distribution morphology of the tobacco material in the fluidized bed and a calculation model for air pressure fluctuations in the fluidized bed are constructed. The preprocessed digital laser signal is input into these two models respectively to obtain the distribution morphology of the tobacco material in the fluidized bed and the values ​​of air pressure fluctuations. Next, based on the distribution morphology of the tobacco material in the fluidized bed, it is determined whether the morphology distribution is normal. If the morphology distribution is abnormal, a warning is issued to the operator, and the rotation speed of the needle roller component that feeds the tobacco material into the fluidized bed is adjusted accordingly via the industrial control computer. Finally, based on the values ​​of air pressure fluctuations in the fluidized bed, the air pressure fluctuations in the fluidized bed are determined. The system monitors whether the fluidized bed is functioning normally. If the air pressure fluctuations within the fluidized bed are abnormal, it simultaneously alerts the operator and adjusts the negative and positive pressure gases on the fluidized bed via the industrial control computer. This allows for real-time and accurate monitoring of the distribution of tobacco materials and air pressure fluctuations within the fluidized bed. It also provides timely warnings and adjustments when the distribution of tobacco materials or air pressure fluctuations within the fluidized bed is abnormal, ensuring efficient and stable flexible conveying of the tobacco materials. This indirectly improves the quality and consistency of rolled products, addressing the issues of low accuracy in monitoring air pressure fluctuations and the lack of monitoring equipment for the distribution of tobacco materials within the fluidized bed.

[0102] Example 2

[0103] Figure 3 This invention provides a structural block diagram of a device for monitoring the distribution and pressure fluctuations of tobacco materials in a fluidized bed based on laser backscattering technology. This embodiment is applicable to situations where it is necessary to monitor the normality of pressure fluctuations and the normality of tobacco material distribution within the fluidized bed during the conveying process of tobacco materials. This device for monitoring the distribution and pressure fluctuations of tobacco materials in a fluidized bed based on laser backscattering technology can be implemented in hardware and / or software, and can be configured in an electronic device with data processing capabilities. Figure 3As shown, the fluidized bed tobacco material distribution and pressure fluctuation monitoring device based on laser backscattering technology in this embodiment may include: 210, a laser signal acquisition / preprocessing module; 220, a fluidized bed tobacco material distribution morphology and fluidized bed pressure fluctuation numerical calculation module; 230, a fluidized bed tobacco material distribution morphology judgment module; and 240, a fluidized bed pressure fluctuation judgment module.

[0104] Among them, 210, the laser signal acquisition / preprocessing module, is used to acquire the laser signal after it is absorbed / scattered by the tobacco shreds in the fluidized bed, and to preprocess the laser signal after it passes through the tobacco shreds in the fluidized bed to obtain the preprocessed laser digital signal;

[0105] 220. Module for calculating the distribution pattern of tobacco materials in a fluidized bed and the numerical calculation model of air pressure fluctuation in a fluidized bed. The pre-processed laser digital signal is input into the calculation model of the distribution pattern of tobacco materials in a fluidized bed and the numerical calculation model of air pressure fluctuation in a fluidized bed to obtain the distribution pattern of tobacco materials in a fluidized bed and the numerical value of air pressure fluctuation in a fluidized bed.

[0106] 230. Fluidized bed tobacco material distribution morphology judgment module, used to judge whether the tobacco material distribution morphology in the fluidized bed is normal based on the distribution morphology of the tobacco material in the fluidized bed; if the tobacco material distribution morphology in the fluidized bed is abnormal, it will issue a warning to the operator and adjust the speed of the needle roller component that feeds the tobacco material into the fluidized bed accordingly through the industrial control computer.

[0107] 240. Fluidized bed gas pressure fluctuation judgment module, used to judge whether the gas pressure fluctuation in the fluidized bed is normal based on the gas pressure fluctuation value in the fluidized bed; if the gas pressure fluctuation in the fluidized bed is abnormal, it will issue a warning to the operator and make corresponding adjustments to the negative pressure gas and positive pressure gas in the fluidized bed through the industrial control computer.

[0108] The technical solution of this application embodiment acquires the laser signal after absorption / scattering by the tobacco shreds passing through the fluidized bed through a laser signal acquisition / preprocessing module. The laser signal after passing through the tobacco material in the fluidized bed is preprocessed to obtain a preprocessed digital laser signal. Then, a calculation model for the distribution morphology of the tobacco material in the fluidized bed and a calculation model for the pressure fluctuation within the fluidized bed are constructed through a calculation module for the distribution morphology of the tobacco material in the fluidized bed and the pressure fluctuation within the fluidized bed. The preprocessed digital laser signal is input into these two models respectively to obtain the distribution morphology of the tobacco material in the fluidized bed and the numerical values ​​of the pressure fluctuation within the fluidized bed. Next, a judgment module for the distribution morphology of the tobacco material in the fluidized bed determines whether the morphology distribution of the tobacco material in the fluidized bed is normal. If the morphology distribution is abnormal, a warning is issued to the operator, and the rotation speed of the needle roller component that feeds the tobacco material into the fluidized bed is monitored by the industrial control computer. Adjustments are made accordingly, and finally, based on the fluctuation value of the air pressure in the fluidized bed, it is determined whether the air pressure fluctuation in the fluidized bed is normal. If the air pressure fluctuation in the fluidized bed is abnormal, an early warning is issued to the operator, and the negative pressure gas and positive pressure gas in the fluidized bed are adjusted accordingly through the industrial control computer. In this way, not only can the distribution of tobacco material morphology and air pressure fluctuation in the fluidized bed be monitored in real time and accurately, but also timely warnings and adjustments can be made when the distribution of tobacco material morphology or the air pressure fluctuation in the fluidized bed is abnormal. This ensures efficient and stable flexible conveying of tobacco material in the fluidized bed, indirectly improving the quality and consistency of rolled products. This solves the problems of low accuracy of existing air pressure fluctuation monitoring equipment due to the large influence of environmental factors, and the inability to grasp the real-time distribution of tobacco material in the fluidized bed due to the lack of existing equipment for monitoring the distribution of tobacco material in the fluidized bed.

[0109] Based on the above embodiments, optionally, the 210 laser signal acquisition / preprocessing module is specifically used for:

[0110] A laser emitter is installed on the side wall of the conveying zone within the fluidized bed, emitting a laser beam into the tobacco material being conveyed within the fluidized bed. After passing through the tobacco material, the laser beam is received by a laser receiver installed on the other side wall of the conveying zone within the fluidized bed. The laser emitter and laser receiver are symmetrically arranged, with the fluidized bed conveying zone located between them.

[0111] The laser signal after passing through the tobacco material is obtained from the laser receiver that has already received the laser.

[0112] The laser signal after passing through the tobacco material is processed using A / D conversion technology to obtain a preprocessed digital laser signal.

[0113] Based on the above embodiments, optionally, the module 220, which calculates the distribution pattern of tobacco materials in the fluidized bed and the numerical calculation of air pressure fluctuations in the fluidized bed, is specifically used for:

[0114] The preprocessed laser digital signal is input into the constructed calculation model of tobacco material distribution in the fluidized bed to obtain the distribution pattern of tobacco material in the fluidized bed. The expression of the calculation model of tobacco material distribution pattern in the fluidized bed is as follows:

[0115]

[0116] Where Q represents the flow distribution pattern of tobacco material in the fluidized bed; A represents the cross-sectional area of ​​the fluidized bed; V represents the average velocity of the tobacco material; ρ represents the average concentration of the tobacco material; L represents the propagation path length of the laser in the fluidized bed, which is generally the width of the fluidized bed; α(ρ) represents the absorption coefficient related to the concentration ρ of the tobacco material; β(ρ) represents the scattering coefficient of the laser as it passes through the tobacco material in the fluidized bed; γ(ρ) represents the scattering coefficient of the laser as it passes through the tobacco material in the fluidized bed.

[0117] The preprocessed laser digital signal is input into the constructed fluidized bed pressure fluctuation calculation model to obtain the pressure fluctuation value within the fluidized bed. The expression of the fluidized bed pressure fluctuation calculation model is as follows:

[0118]

[0119] Where I is the intensity of the laser digital signal after passing through the fluidized bed tobacco material; I0 is the initial intensity of the laser digital signal, that is, the initial intensity before the laser passes through the tobacco material; σ is the extinction coefficient; P is the air pressure in the fluidized bed; P0 is the air pressure at room temperature; ρ0 is the density of the tobacco material at room temperature; and L is the propagation path length of the laser in the fluidized bed, which is generally the width of the fluidized bed.

[0120] Based on the above embodiments, optionally, the 230, the fluidized bed tobacco material distribution morphology judgment module, is specifically used for:

[0121] The distribution pattern of tobacco shreds in fluidized bed was compared with that of normal tobacco shreds; the distribution pattern of normal tobacco shreds is that the tobacco shreds are evenly distributed in the fluidized bed conveying zone.

[0122] If the distribution pattern of tobacco shreds in the fluidized bed matches the normal distribution pattern of tobacco shreds, then the distribution pattern of tobacco shreds in the fluidized bed is normal.

[0123] If the distribution pattern of tobacco shreds in the fluidized bed is denser or more sparser than the normal distribution pattern, then the distribution pattern of tobacco shreds in the fluidized bed is abnormal.

[0124] If the distribution pattern of tobacco shreds in the fluidized bed is abnormal, the system will simultaneously issue a warning to the operator via the display and show the abnormal distribution pattern of the tobacco shreds, while the industrial control computer will adjust the rotation speed of the needle roller component used to feed the tobacco shreds into the fluidized bed accordingly.

[0125] When the distribution of tobacco shreds in the fluidized bed is normal, the display shows the operator the normal distribution of tobacco shreds at this time, but does not adjust the rotation speed of the needle roller component used to feed the tobacco shreds into the fluidized bed.

[0126] Based on the above embodiments, optionally, when the distribution pattern of tobacco shreds in the fluidized bed is abnormal, a warning is simultaneously issued to the operator via a display screen, showing the current abnormal distribution pattern of the tobacco shreds. At the same time, the rotational speed of the needle roller component used to feed the tobacco shreds into the fluidized bed is adjusted accordingly via an industrial control computer. Specifically, this is used for:

[0127] If the distribution of tobacco shreds in the fluidized bed is deemed abnormal due to its denser distribution compared to the normal distribution, the system will simultaneously warn and display the abnormal distribution of tobacco shreds to the operator, and reduce the speed of the needle roller component that feeds the tobacco shreds into the fluidized bed via the industrial control computer to control the amount of tobacco shreds input into the fluidized bed.

[0128] If the distribution of tobacco shreds in the fluidized bed is deemed abnormal due to its more dispersed shape compared to the normal distribution, the system will simultaneously issue a warning to the operator and display the abnormal distribution pattern of the tobacco shreds. At the same time, the speed of the needle roller component that feeds the tobacco shreds into the fluidized bed will be increased via the industrial control computer to control the amount of tobacco shreds input into the fluidized bed.

[0129] Based on the above embodiments, optionally, the 240 fluidized bed gas pressure fluctuation judgment module is specifically used for:

[0130] Compare the air pressure fluctuation value in the fluidized bed with the preset air pressure fluctuation range threshold;

[0131] If the air pressure fluctuation value in the fluidized bed is within the preset air pressure fluctuation range threshold, then the air pressure fluctuation in the fluidized bed is normal.

[0132] If the air pressure fluctuation value in the fluidized bed is not within the preset air pressure fluctuation range threshold, then the air pressure fluctuation in the fluidized bed is abnormal.

[0133] When the gas pressure fluctuation in the fluidized bed is abnormal, the system will simultaneously issue a warning to the operator and display the abnormal gas pressure fluctuation value on the monitor, while the industrial control computer will make corresponding adjustments to the negative and positive pressure gas in the fluidized bed.

[0134] When the gas pressure fluctuation in the fluidized bed is normal, the system will simultaneously issue warnings to the operators via the display and show the normal distribution of tobacco materials, while the industrial control computer will make corresponding adjustments to the negative and positive pressure gases in the fluidized bed.

[0135] Based on the above embodiments, optionally, when the gas pressure fluctuation in the fluidized bed is abnormal, a warning is simultaneously issued to the operator via a display screen, showing the current abnormal gas pressure fluctuation value, while the industrial control computer makes corresponding adjustments to the negative and positive pressure gases in the fluidized bed. Specifically, this is used for:

[0136] If the air pressure fluctuation in the fluidized bed is judged to be abnormal because it exceeds the air pressure fluctuation range threshold, the operator will be alerted and the abnormal air pressure fluctuation value will be displayed on the monitor. At the same time, the solenoid valve on the air pipe that inputs air into the fluidized bed and another solenoid valve on another air pipe that inputs air into the fluidized bed will be controlled by the industrial control computer to perform corresponding actions, thereby indirectly adjusting the air pressure fluctuation in the fluidized bed to within the preset air pressure fluctuation range threshold.

[0137] If the air pressure fluctuation in the fluidized bed is judged to be abnormal because it is less than the air pressure fluctuation range threshold, the operator will be alerted and the abnormal air pressure fluctuation value will be displayed on the monitor. At the same time, the solenoid valve on the air pipe that supplies air into the fluidized bed and another solenoid valve on another air pipe that supplies air into the fluidized bed will be controlled by the industrial control computer to make corresponding adjustment actions, so as to indirectly adjust the air pressure fluctuation in the fluidized bed to within the preset air pressure fluctuation range threshold.

[0138] The device for monitoring the distribution of tobacco materials and pressure fluctuations in a fluidized bed based on laser backscattering technology provided in this embodiment of the invention can execute the method for monitoring the distribution of tobacco materials and pressure fluctuations in a fluidized bed based on laser backscattering technology provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the method.

[0139] Example 3

[0140] Figure 4 A schematic diagram of an electronic device 10 that can be used to implement embodiments of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0141] like Figure 4 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 may also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0142] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0143] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, central processing unit (CPU), graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, digital signal processors (DSPs), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as the method for monitoring the distribution of tobacco materials and pressure fluctuations in a fluidized bed based on laser backscattering technology.

[0144] In some embodiments, the method for monitoring the distribution of tobacco materials and pressure fluctuations in a fluidized bed based on laser backscattering technology can be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the method for monitoring the distribution of tobacco materials and pressure fluctuations in a fluidized bed based on laser backscattering technology described above can be performed. Alternatively, in other embodiments, processor 11 can be configured to perform the method for monitoring the distribution of tobacco materials and pressure fluctuations in a fluidized bed based on laser backscattering technology by any other suitable means (e.g., by means of firmware).

[0145] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0146] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0147] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0148] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0149] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0150] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0151] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0152] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

[0153] Although the invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter arrangement within the scope of the disclosure, drawings, and claims. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A method for monitoring the distribution and pressure fluctuation of tobacco materials in a fluidized bed based on laser backscattering technology, characterized in that: Includes the following steps: The laser signal after absorption / scattering through the tobacco shreds in the fluidized bed is acquired, and the laser signal after passing through the tobacco shreds in the fluidized bed is preprocessed to obtain the preprocessed laser digital signal. A calculation model for the distribution pattern of tobacco materials in a fluidized bed and a calculation model for the air pressure fluctuation in a fluidized bed are constructed. The pre-processed laser digital signal is input into the calculation model for the distribution pattern of tobacco materials in a fluidized bed and the calculation model for the air pressure fluctuation in a fluidized bed, respectively, to obtain the distribution pattern of tobacco materials in a fluidized bed and the values ​​of the air pressure fluctuation in a fluidized bed. Based on the distribution pattern of tobacco shreds in the fluidized bed, determine whether the distribution pattern of tobacco shreds in the fluidized bed is normal; if the distribution pattern of tobacco shreds in the fluidized bed is abnormal, issue a warning to the operator while adjusting the rotation speed of the needle roller component that feeds the tobacco shreds into the fluidized bed via the industrial control computer. Based on the value of gas pressure fluctuation in the fluidized bed, determine whether the gas pressure fluctuation in the fluidized bed is normal; If the air pressure fluctuation in the fluidized bed is abnormal, an early warning will be issued to the operator, and the negative and positive airflow in the fluidized bed will be adjusted accordingly via the industrial control computer.

2. The method for monitoring the distribution and pressure fluctuation of tobacco materials in a fluidized bed based on laser backscattering technology according to claim 1, characterized in that: The process of acquiring the laser signal after absorption / scattering by the tobacco shreds within the fluidized bed, and preprocessing the laser signal after it passes through the tobacco material in the fluidized bed to obtain a preprocessed digital laser signal, includes the following steps: A laser emitter is installed on the side wall of the conveying zone within the fluidized bed, emitting a laser beam into the tobacco material being conveyed within the fluidized bed. After passing through the tobacco material, the laser beam is received by a laser receiver installed on the other side wall of the conveying zone within the fluidized bed. The laser emitter and laser receiver are symmetrically arranged, with the fluidized bed conveying zone located between them. The laser signal after passing through the tobacco material is obtained from the laser receiver that has already received the laser. The laser signal after passing through the tobacco material is processed using A / D conversion technology to obtain a preprocessed digital laser signal.

3. The method for monitoring the distribution and pressure fluctuation of tobacco materials in a fluidized bed based on laser backscattering technology according to claim 1, characterized in that: The construction of the calculation model for the distribution morphology of tobacco materials in the fluidized bed and the calculation model for air pressure fluctuations in the fluidized bed involves inputting the preprocessed laser digital signal into the calculation models for the distribution morphology of tobacco materials in the fluidized bed and the calculation models for air pressure fluctuations in the fluidized bed, respectively, to obtain the numerical values ​​of the distribution morphology of tobacco materials in the fluidized bed and the air pressure fluctuations in the fluidized bed. This includes the following steps: The preprocessed laser digital signal is input into the constructed calculation model of tobacco material distribution in the fluidized bed to obtain the distribution pattern of tobacco material in the fluidized bed. The expression of the calculation model of tobacco material distribution pattern in the fluidized bed is as follows: Where Q represents the flow distribution pattern of tobacco material in the fluidized bed; A represents the cross-sectional area of ​​the fluidized bed; V represents the average velocity of the tobacco material; ρ represents the average concentration of the tobacco material; L represents the propagation path length of the laser in the fluidized bed, which is generally the width of the fluidized bed; α(ρ) represents the absorption coefficient related to the concentration ρ of the tobacco material; β(ρ) represents the scattering coefficient of the laser as it passes through the tobacco material in the fluidized bed; γ(ρ) represents the scattering coefficient of the laser as it passes through the tobacco material in the fluidized bed. The preprocessed laser digital signal is input into the constructed fluidized bed pressure fluctuation calculation model to obtain the pressure fluctuation value within the fluidized bed. The expression of the fluidized bed pressure fluctuation calculation model is as follows: Where I is the intensity of the laser digital signal after passing through the fluidized bed tobacco material; I0 is the initial intensity of the laser digital signal, that is, the initial intensity before the laser passes through the tobacco material; σ is the extinction coefficient; P is the air pressure in the fluidized bed; P0 is the air pressure at room temperature; ρ0 is the density of the tobacco material at room temperature; and L is the propagation path length of the laser in the fluidized bed, which is generally the width of the fluidized bed.

4. The method for monitoring the distribution and pressure fluctuation of tobacco materials in a fluidized bed based on laser backscattering technology according to claim 1, characterized in that: The method involves determining whether the distribution of tobacco shreds in the fluidized bed is normal based on the distribution morphology of the tobacco shreds. If the distribution morphology is abnormal, an early warning is issued to the operator, and the rotation speed of the needle roller component that feeds the tobacco shreds into the fluidized bed is adjusted accordingly via the industrial control computer. This includes the following steps: The distribution pattern of tobacco shreds in fluidized bed was compared with that of normal tobacco shreds; the distribution pattern of normal tobacco shreds is that the tobacco shreds are evenly distributed in the fluidized bed conveying zone. If the distribution pattern of tobacco shreds in the fluidized bed matches the normal distribution pattern of tobacco shreds, then the distribution pattern of tobacco shreds in the fluidized bed is normal. If the distribution pattern of tobacco shreds in the fluidized bed is denser or more sparser than the normal distribution pattern, then the distribution pattern of tobacco shreds in the fluidized bed is abnormal. If the distribution pattern of tobacco shreds in the fluidized bed is abnormal, the system will simultaneously issue a warning to the operator via the display and show the abnormal distribution pattern of the tobacco shreds, while the industrial control computer will adjust the rotation speed of the needle roller component used to feed the tobacco shreds into the fluidized bed accordingly. When the distribution of tobacco shreds in the fluidized bed is normal, the display shows the operator the normal distribution of tobacco shreds at this time, but does not adjust the rotation speed of the needle roller component used to feed the tobacco shreds into the fluidized bed.

5. The method for monitoring the distribution and pressure fluctuation of tobacco materials in a fluidized bed based on laser backscattering technology according to claim 4, characterized in that: When the distribution of tobacco shreds in the fluidized bed is abnormal, the system simultaneously issues a warning to the operator via a display showing the abnormal distribution pattern, and adjusts the rotation speed of the needle roller component used to feed the tobacco shreds into the fluidized bed via an industrial control computer. This includes the following steps: If the distribution of tobacco shreds in the fluidized bed is deemed abnormal due to its denser distribution compared to the normal distribution, the system will simultaneously warn and display the abnormal distribution of tobacco shreds to the operator, and reduce the speed of the needle roller component that feeds the tobacco shreds into the fluidized bed via the industrial control computer to control the amount of tobacco shreds input into the fluidized bed. If the distribution of tobacco shreds in the fluidized bed is deemed abnormal due to its more dispersed shape compared to the normal distribution, the system will simultaneously issue a warning to the operator and display the abnormal distribution pattern of the tobacco shreds. At the same time, the speed of the needle roller component that feeds the tobacco shreds into the fluidized bed will be increased via the industrial control computer to control the amount of tobacco shreds input into the fluidized bed.

6. The method for monitoring the distribution and pressure fluctuation of tobacco materials in a fluidized bed based on laser backscattering technology according to claim 1, characterized in that: The method is to determine whether the pressure fluctuation within the fluidized bed is normal based on the pressure fluctuation value within the fluidized bed. If the air pressure fluctuation inside the fluidized bed is abnormal, an early warning will be issued to the operator, and the negative and positive airflow in the fluidized bed will be adjusted accordingly via the industrial control computer, including the following steps: Compare the air pressure fluctuation value in the fluidized bed with the preset air pressure fluctuation range threshold; If the air pressure fluctuation value in the fluidized bed is within the preset air pressure fluctuation range threshold, then the air pressure fluctuation in the fluidized bed is normal. If the air pressure fluctuation value in the fluidized bed is not within the preset air pressure fluctuation range threshold, then the air pressure fluctuation in the fluidized bed is abnormal. When the air pressure fluctuation in the fluidized bed is abnormal, the system will simultaneously issue a warning to the operator and display the abnormal air pressure fluctuation value on the monitor, while the industrial control computer will make corresponding adjustments to the negative pressure airflow and positive pressure airflow in the fluidized bed. When the air pressure fluctuation in the fluidized bed is normal, the system will simultaneously issue warnings to the operators via the display and show the normal distribution of tobacco materials, while the industrial control computer will make corresponding adjustments to the negative and positive pressure airflow in the fluidized bed.

7. The method for monitoring the distribution of tobacco materials and pressure fluctuations in a fluidized bed based on laser backscattering technology according to claim 6, characterized in that: In the event of abnormal air pressure fluctuations within the fluidized bed, the system simultaneously issues a warning to the operator via a display and shows the abnormal air pressure fluctuation value. Simultaneously, the industrial control computer adjusts the negative and positive pressure airflow within the fluidized bed accordingly, including the following steps: If the air pressure fluctuation in the fluidized bed is judged to be abnormal because it exceeds the air pressure fluctuation range threshold, the operator will be alerted and the abnormal air pressure fluctuation value will be displayed on the monitor. At the same time, the solenoid valve on the air pipe that inputs air into the fluidized bed and another solenoid valve on another air pipe that outputs air into the fluidized bed will be controlled by the industrial control computer to perform corresponding actions, thereby indirectly adjusting the air pressure fluctuation in the fluidized bed to within the preset air pressure fluctuation range threshold. If the air pressure fluctuation in the fluidized bed is judged to be abnormal because it is less than the air pressure fluctuation range threshold, the operator will be alerted and the abnormal air pressure fluctuation value will be displayed on the monitor. At the same time, the solenoid valve on the air pipe that supplies air into the fluidized bed and another solenoid valve on another air pipe that supplies air into the fluidized bed will be controlled by the industrial control computer to make corresponding adjustment actions, so as to indirectly adjust the air pressure fluctuation in the fluidized bed to within the preset air pressure fluctuation range threshold.

8. A device for monitoring the distribution of tobacco materials and pressure fluctuations in a fluidized bed based on laser backscattering technology, characterized in that, include: The laser signal acquisition / preprocessing module is used to acquire the laser signal after it is absorbed / scattered by the tobacco shreds passing through the fluidized bed, and to preprocess the laser signal after it passes through the tobacco shreds in the fluidized bed to obtain the preprocessed laser digital signal. The module for calculating the distribution pattern of tobacco materials in a fluidized bed and the numerical calculation of air pressure fluctuations in a fluidized bed is used to construct calculation models for the distribution pattern of tobacco materials in a fluidized bed and the numerical calculation models for air pressure fluctuations in a fluidized bed. The pre-processed laser digital signal is input into the calculation models for the distribution pattern of tobacco materials in a fluidized bed and the numerical calculation models for air pressure fluctuations in a fluidized bed, respectively, to obtain the numerical values ​​for the distribution pattern of tobacco materials in a fluidized bed and the numerical values ​​for air pressure fluctuations in a fluidized bed. The fluidized bed tobacco material distribution morphology judgment module is used to determine whether the tobacco material distribution morphology in the fluidized bed is normal based on the distribution morphology of the tobacco material in the fluidized bed; if the tobacco material distribution morphology in the fluidized bed is abnormal, it will issue a warning to the operator and adjust the speed of the needle roller component that feeds the tobacco material into the fluidized bed accordingly through the industrial control computer. The fluidized bed air pressure fluctuation judgment module is used to determine whether the air pressure fluctuation in the fluidized bed is normal based on the air pressure fluctuation value in the fluidized bed. If the air pressure fluctuation in the fluidized bed is abnormal, the operator will be alerted and the negative and positive airflow in the fluidized bed will be adjusted accordingly via the industrial control computer.

9. An electronic device, characterized in that, The electronic device includes: One or more processors; A memory for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement the method for monitoring the distribution of tobacco materials and air pressure fluctuations in a fluidized bed based on laser backscattering technology as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the method for monitoring the distribution of tobacco materials and air pressure fluctuations in a fluidized bed based on laser backscattering technology, as described in any one of claims 1-7.

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