Feed liquid mixing and stirring device and method applicable to tobacco processing sugar spice kitchen

Abstract

The invention provides a feed liquid mixing and stirring device applicable to a tobacco processing sugar spice kitchen, comprising: a stirrer, the stirrer comprising a central shaft and a plurality of independently operating stirring units arranged on the central shaft from bottom to top; and the platform terminal system is used for acquiring particle distribution, density distribution and refractive index distribution of the feed liquid container, determining a feed liquid risk mode based on the particle distribution, the density distribution and the refractive index distribution, and controlling at least one stirring unit of the stirrer to work according to the feed liquid risk mode.

Description

Technical Field

[0001] The present invention relates to the field of flavor and fragrance detection in tobacco processing. Specifically, it relates to a liquid material mixing and stirring device and method applicable to the sugar and spice kitchen in tobacco processing. Background Art

[0002] In cigarette production, sugar and spice are necessary auxiliary materials to ensure the realization of product flavor. Its liquid material is usually mixed with multiple components and has characteristics such as high viscosity and easy crystallization, which will also cause stratification or precipitation during temporary storage. This phenomenon will affect the quality of the sugar solution and even more affect the quality of cigarette products. If the liquid material is not stirred for a long time, large particles or sediments will be generated, resulting in blockage of the output pipeline, affecting the time to transfer to the next process and prolonging the production cycle, and to a certain extent increasing the maintenance cost of production equipment.

[0003] In tobacco factories, the stirring of sugar and spice raw materials mainly relies on pneumatic stirring devices or directly blowing away the deposits in the pipeline by force. Pneumatic stirring is not comprehensive and uniform enough for the stirring treatment of sugar and spice raw materials, which will affect the subsequent cigarette processing efficiency. And the method of directly blowing away the deposits not only loses the liquid material but also cannot effectively solve the problem of liquid material stratification. In view of the above problems, it is necessary to manufacture a stirring device and method for a comprehensive quality test bench for the mixing quality of liquid materials applicable to the sugar and spice kitchen in tobacco processing.

[0004] The patent application document with the publication number CN218485812U discloses a pneumatic stirring device for the tank body of the sugar and spice kitchen in a cigarette factory. This device mainly stirs the liquid based on the pneumatic motor at the top of the tank body and the transmission rod in the tank body. The above device optimizes the pneumatic stirring device but does not solve the problem of the deposition of particles in the sugar and spice liquid in the tank during the temporary storage time in real time.

[0005] In the prior art, there is no solution to the problems of large particles, sediments and stratification generated by the sugar and spice liquid during temporary storage in the workshop. However, these problems will directly affect the progress of the subsequent cigarette processing process. The present invention is proposed for the above problems. The uniformity of the sugar and spice liquid material during the temporary storage time in the workshop is crucial. Through real-time monitoring and stirring, its uniformity can be guaranteed and the continuity of each process can be ensured.

[0006] In order to solve the above existing problems, people have been seeking an ideal technical solution. Summary of the Invention

[0007] Based on this, in view of the above technical problems, it is necessary to provide a liquid material mixing and stirring device and method applicable to the sugar and spice kitchen in tobacco processing.

[0008] To achieve the above object, the first aspect of the present invention provides a liquid material mixing and stirring device applicable to the sugar and spice kitchen in tobacco processing, including: A stirrer, the stirrer includes a central shaft and a plurality of independently operating stirring units arranged on the central shaft from bottom to top; A platform terminal system, configured to obtain the particle distribution, density stratification distribution, and refractive index stratification distribution of a liquid material container, determine a liquid material risk mode based on the particle distribution, density stratification distribution, and refractive index stratification distribution, and control at least one stirring unit of the stirrer to operate according to the liquid material risk mode, and execute different stirring modes.

[0009] In a possible embodiment, the first stirring unit is arranged at the bottom and includes a five-blade propeller and a first driving unit; the second stirring unit is arranged in the middle and includes a three-blade skew-cut paddle and a second driving unit; the third stirring unit is arranged at the top and includes a two-blade flat paddle and a third driving unit; The driving shafts of the first driving unit, the second driving unit, and the third driving unit are sleeved outside the central shaft from bottom to top to drive the corresponding paddles to rotate.

[0010] In a possible embodiment, the liquid material risk mode includes a global precipitation high risk, a local precipitation high risk, a multi-layer density high risk, a refractive index high risk, and a single-layer density high risk; Among them, the global precipitation high risk > the local precipitation high risk > the multi-layer density high risk > the refractive index high risk > the single-layer density high risk; If there are multiple liquid material risk modes at the same time, control at least one stirring unit of the stirrer to operate according to the liquid material risk mode with a higher priority.

[0011] In a possible embodiment, controlling at least one stirring unit of the stirrer to operate according to the liquid material risk type and the dynamic risk level includes: When the liquid material risk mode is a local precipitation high risk, control the stirring unit in the area where the local precipitation high risk is located to perform local stirring according to the first stirring mode; When the liquid material risk mode is a global precipitation high risk, control all stirring units to perform global stirring according to the second stirring mode; When the liquid material risk mode is a single-layer density high risk, control the stirring unit in the area where the single-layer density high risk is located to perform local stirring according to the third stirring mode; When the liquid material risk mode is a multi-layer density high risk, control the stirring units in the area where the multi-layer density high risk is located to perform coordinated stirring according to the fourth stirring mode; When the liquid material risk mode is a refractive index high risk, control the stirring units in the area where the refractive index high risk is located to perform coordinated stirring according to the fifth stirring mode.

[0012] Specifically, the liquid material mixing and stirring device further includes a detection module, and the detection module includes: An optical fiber industrial endoscope unit for performing a three-dimensional grid scanning on the liquid in a liquid container and obtaining the grid partition particle distribution of the liquid in the liquid container based on the scanned image; A density measurement unit for obtaining the density stratification distribution of the liquid in the liquid container; A refractive index measurement unit for obtaining the refractive index stratification distribution of the liquid in the liquid container; Wherein, the initial detection sequence is: the optical fiber industrial endoscope unit, the density measurement unit, and the refractive index measurement unit.

[0013] To achieve the above object, a second aspect of the present invention provides a method for mixing and stirring a liquid applicable to a tobacco processing sugar and spice kitchen, including the following steps: Obtain the particle distribution, density stratification distribution, and refractive index stratification distribution of the liquid container, and determine the liquid risk mode based on the particle distribution, density stratification distribution, and refractive index stratification distribution; Control at least one stirring unit of the stirrer to work according to the liquid risk mode and execute different stirring modes.

[0014] In a possible embodiment, determining the liquid risk mode based on the particle distribution, density stratification distribution, and refractive index stratification distribution includes the following steps: For the particle distribution data, judge whether there are abnormal particles or abnormal distribution densities in each grid partition based on the preset particle size classification standard and particle distribution density classification standard, and mark the particle distribution status; Wherein, if it is judged that the particles in the grid partition satisfy the particle density ≥ particle density threshold, or it is judged that there are particles with particle size > particle size threshold in the grid partition, then it is determined that the grid partition is a high-risk area for local precipitation; If at least three adjacent grid partitions are all high-risk areas for local precipitation, and the particle density difference between any two adjacent grid partitions > the preset particle density difference threshold, then the entire liquid solution is marked as a high-risk area for global precipitation; For the density stratification distribution, calculate the average density of two adjacent height stratifications respectively and calculate the maximum density difference, and perform density inversion detection, and judge density abnormality based on the maximum density difference and the density inversion detection result; If the maximum density difference ≥ density abnormality threshold, then mark the corresponding height stratification as a high-risk area for single-layer density; If at least three adjacent height stratifications all have density inversion and the duration is greater than the preset time, then mark the corresponding height stratification as a high-risk area for multi-layer density; For the refractive index stratification distribution data, calculate the average refractive index of two adjacent height stratifications respectively and calculate the maximum refractive index difference, and perform refractive index inversion detection, and judge refractive index abnormality based on the maximum refractive index difference and the refractive index inversion detection result; Among them, if the maximum refractive index difference ≥ the abnormal refractive index threshold, or refractive index inversion exists in at least three adjacent height stratifications, the corresponding height stratification is marked as a high refractive index risk.

[0015] In a possible embodiment, after at least one stirring unit of the stirrer is controlled to work, the rotation speed of the stirring unit is adjusted according to the viscosity of the liquid material. Among them, when the viscosity of the liquid material is greater than or equal to the viscosity threshold, according to the high-viscosity fluid algorithm, the rotation speed of the stirring unit is dynamically adjusted in combination with the viscosity of the liquid material, and the formula is as follows: N real =N0×(500 / μ) 0.5 , In the formula, N0 is the initially set rotation speed; μ is the viscosity of the liquid material, and the unit is cP. When the viscosity of the liquid material is less than the viscosity threshold, the rotation speed of the stirring unit is dynamically adjusted by using the progressive acceleration formula, and the formula is as follows: N (t) =N0×(1 + 0.05t) In the formula, N (t) is the target rotation speed at time t, and N set is the initially set rotation speed.

[0016] The present invention has outstanding substantive features and remarkable progress. Specifically, a plurality of independently operating stirring units arranged on the central axis from bottom to top of the present invention can control at least one stirring unit to work according to the current liquid material risk mode of the liquid material container, such as large particles, sediments, and stratification risks, so as to accurately realize the mixing of the sugar and spice liquid materials in the liquid material container; Furthermore, a detection module is provided to cooperate with the stirring module for control, which can realize all-dimensional real-time monitoring of the quality of the sugar and spice liquid, and realize the automatic setting of the stirring device, improve production efficiency, and ensure the uniformity of the sugar and spice liquid materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a diagram of the liquid material mixing and stirring device according to Embodiment 1 of the present invention; Figure 2 is a schematic structural diagram of a vertical three-propeller blade adaptive stirring system; Figure 3 is a schematic diagram of the liquid material mixing and stirring method according to Embodiment 3 of the present invention; In the figure: A1. Five-blade propeller, A2. Three-blade oblique-cut propeller, A3. Two-blade straight propeller. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The technical solutions of the present invention will be further described in detail below through specific embodiments.

[0019] Example 1 This embodiment provides a liquid mixing and stirring device applicable to a tobacco processing sugar and spice kitchen, as Figure 1 shown, which is characterized by including: A stirrer, which includes a central shaft and a plurality of independently operating stirring units arranged on the central shaft from bottom to top; A platform terminal system for obtaining the particle distribution, density stratification distribution, and refractive index stratification distribution of a liquid container, determining a liquid risk mode based on the particle distribution, density stratification distribution, and refractive index stratification distribution, and controlling at least one stirring unit of the stirrer to operate according to the liquid risk mode and execute different stirring modes.

[0020] Specifically, as Figure 2 shown, the first stirring unit is arranged at the bottom and includes a five-blade propeller A1 and a first driving unit; the second stirring unit is arranged in the middle and includes a three-blade oblique cutting paddle A2 and a second driving unit; the third stirring unit is arranged at the top and includes a two-blade flat paddle A3 and a third driving unit; The drive shafts of the first driving unit, the second driving unit, and the third driving unit are sleeved outside the central shaft from bottom to top to drive the corresponding paddles to rotate.

[0021] In a possible embodiment, the driving unit corresponding to the five-blade propeller A1 is a 3kW permanent magnet synchronous servo motor + planetary reducer (1:30), the driving unit corresponding to the three-blade oblique cutting paddle A2 is a 2.2kW permanent magnet synchronous servo motor + harmonic reducer (1:50), and the driving unit corresponding to the two-blade flat paddle A3 is a 1.5kW permanent magnet synchronous servo motor + worm and worm gear (1:20).

[0022] It can be understood that the central shaft is a hollow structure with a therCAT bus built therein to control the three driving units; and the drive shafts of the three driving units are mechanically linked through the hollow central shaft, and the central shaft adopts a double-lip fluororubber seal + nitrogen purge shaft seal to prevent the sugar and spice liquid from seeping in; the motor control signals of the three driving units are separated and can be started, stopped, or variable speed individually; in addition, all three driving units are equipped with fiber Bragg grating strain sensors to monitor torque / vibration in real time.

[0023] In another embodiment, the liquid mixing and stirring device further includes a detection module, and the detection module includes: An optical fiber industrial endoscope unit for performing three-dimensional grid scanning on the liquid in the liquid container and obtaining the grid partition particle distribution of the liquid in the liquid container based on the scanned image; A density measurement unit for obtaining the density stratification distribution of the liquid in the liquid container; A refractive index measurement unit for obtaining the refractive index stratification distribution of the liquid in the liquid container; Among them, the initial detection sequence is: the fiber optic industrial endoscope unit, the density measurement unit, and the refractive index measurement unit.

[0024] Furthermore, when re-inspecting after stirring, the re-inspection sequence is: the density measurement unit, the refractive index measurement unit, and the fiber optic industrial endoscope unit.

[0025] Specifically, the fiber optic industrial endoscope unit mainly consists of a head end portion, a bending portion, a fiber optic probe, a main hose (insertion portion), an operation portion, and a light guide hose. Among them, The fiber optic bundle of the fiber optic probe is made of glass, and is sequentially coated with polyvinyl chloride material, fiber, and polytetrafluoroethylene high-strength material on the outside, so as to withstand the acidity and alkalinity (pH 2-10) of the sugar flavor liquid; a non-adhesive coating is also provided on the outermost surface layer of the fiber optic probe, and the non-adhesive coating is mirror-polished (Ra≤0.8μm), so as to reduce sugar liquid residue and avoid misjudgment of particulate matter.

[0026] The light source system of the fiber optic industrial endoscope unit uses a multi-angle LED ring light source, integrated with temperature feedback control (wavelength range: 850nm±10nm), and the wavelength is adjustable, so as to adapt to the liquid light transmittance. The light source can be transmitted to the front-end lighting part through the fiber optic bundle.

[0027] The shape of the fiber optic probe is circular (diameter≤8mm) and can rotate 360°. It can be understood that the fiber optic probe includes a rotation drive motor (stepper motor, ±0.5° accuracy, pausing once every 360 / N degrees of rotation, so as to divide the liquid material container into N horizontally independent detection ranges), a CCD micro camera (2 million pixels, can focus macroscopically, and can transmit clear image data), and a linear drive motor (vertical movement, pausing once every certain distance of movement, so as to divide each horizontally independent detection range into M grid partitions in the vertical direction). In addition, a micro thermocouple is closely arranged beside the CCD micro camera to compensate for thermal noise points in real time.

[0028] During use, the fiber optic probe of the fiber optic industrial endoscope unit is vertically inserted into the liquid material container. After ensuring that the end of the probe reaches the bottom of the liquid material container (positioning accuracy ±2mm), perform light source intensity adaptive calibration (brightness range 100-1000 Lux), and start the multi-angle LED ring light source to illuminate the positioning area.

[0029] The housing of the fiber optic probe is coated with a high-strength plastic coating and a waterproof coating, and is corrosion-resistant.

[0030] During use, the liquid material container is evenly divided into N×M grid partitions, and the optical fiber probe is controlled to collect images of each grid partition respectively; where N is the number of grid partitions on the horizontal plane, and M is the number of grid partitions on the vertical plane; specifically, in the initial state, the linear drive motor is controlled to move vertically upward to collect images of M grid partitions in the vertical direction respectively; then the rotary drive motor is controlled to step once, rotating an angle of 360 / N, and the linear drive motor is controlled to move vertically downward again to collect images of M grid partitions in the vertical direction at this angle respectively; then the rotary drive motor is controlled to step once again, rotating an angle of 360 / N, and the linear drive motor is controlled to move vertically upward again to collect images of M grid partitions in the vertical direction at this angle respectively; repeat the above steps until images of N×M grid partitions are collected.

[0031] It can be understood that the specific values of M and N can be set according to the size of the liquid material container and the acquisition requirements; for example, if the liquid material container is large, M and N can be designed as relatively large values accordingly; in addition, when the acquisition requirement is fine acquisition, M and N can also be designed as relatively large values.

[0032] In a possible embodiment, N = 9 and M = 3; then the optical fiber probe divides the liquid material container into 27 grid partitions, and images of the 27 grid partitions are collected by partition. The collected images of each grid partition are subjected to gray normalization processing, the Canny edge detection algorithm is used to extract the particle contours in the collected images, and the particle contours are compared with the sugar crystal contours in the sugar crystal morphology verification library to distinguish sugar crystal particles from impurity particles; the number and distribution density of sugar crystal particles in each collected image are counted, and the particle size of each sugar crystal particle is calculated, so as to obtain the particle distribution in the liquid material container.

[0033] In addition, sugar crystal liquid is generally made from raw materials such as sugarcane or beets. During the sugar-making process, if the raw material fiber impurities are not completely removed, there will be fiber impurities in the sugar crystal liquid, and the fiber impurities mostly show an elongated shape; while sugar crystals tend to be spherical after processing, and their roundness is higher than that of fiber impurities. Therefore, in this embodiment, before the gray normalization processing of the collected images of each grid partition, fiber impurities are excluded based on a set roundness threshold. For example, particles with a roundness less than the roundness threshold in the grid partition are filtered out. Among them, in a possible embodiment, the roundness threshold is set to 0.8.

[0034] Specifically, the density measurement unit as a whole is a directly installable and insertable-into-tank density measurement unit, and there are m measurement sites equidistantly arranged along the length direction of the density measurement unit. In this embodiment, the total length of the densitometer is 90 cm, and there are 5 heights (spacing 22.5 cm) equidistantly along the length direction, covering the range from the bottom of the tank to 15 cm below the liquid level. The part in contact with the liquid is made of 316L stainless steel, and the sealing component is a fluororubber O-ring (temperature resistance range: 20°C - 200°C). The top of the installation interface is a DN50 sanitary quick-install flange 6; the pressure sensor 7 has a range of 0 - 5 bar, an accuracy of ±0.1% FS, and its surface is coated with a polytetrafluoroethylene anti-corrosion layer, being corrosion-resistant; the temperature sensor is a PT100 platinum resistance temperature sensor (measurement range: -20°C - 150°C, accuracy: ±0.1°C).

[0035] During use, insert the probe of the densitometer vertically into the liquid container of the material to obtain the densities at 5 heights equidistantly arranged along the length direction of the densitometer. Among them, the 5 heights are arranged from bottom to top.

[0036] The five-layer pressure sensors at the measurement points with a spacing of 22.5 cm are started simultaneously to measure the static pressure values at each point. At the same time, the temperature sensor will collect the temperature data of each layer; Perform density conversion on the density of each site according to the static pressure method to obtain the density stratified distribution data.

[0037] The static pressure method formula is as follows: (n = 1, 2, 3, 4) Among them, Pn is the pressure value at the nth site (Pa), h is the spacing between adjacent sites (0.225 m), and g is the acceleration due to gravity (9.8 m / s²). Specifically, the fifth site measures the ambient air pressure by the top sensor.

[0038] Introduce a temperature-viscosity coupling compensation algorithm to correct the density: - α is the sugar solution expansion coefficient, β is the viscosity correction factor, T is the current temperature, Tref is the standard temperature; μ is...

[0039] In a possible embodiment, α = 0.0002 / °C, β = 0.15.

[0040] Specifically, the refractive index measurement unit includes: a transparent conveying pipeline with an inner diameter of 4 mm, made of ethylene tetrafluoroethylene copolymer, resistant to sugar solution crystallization adhesion, and with a temperature resistance range of -40°C to 150°C; a liftable sampling probe composed of L independent flexible pipelines (in this embodiment, taking 5 independent flexible pipelines L1-L5 as an example), made of ethylene tetrafluoroethylene copolymer, corrosion-resistant; a peristaltic pump is a pulsation-free peristaltic pump with a flow rate range of 0.1-10 mL / s and an accuracy of ±0.5%, which can be used for sugar spice solutions with a viscosity ≤ 1200 cP; a refractometer has a measurement range of 1.3000-1.7000 nD and a resolution of 0.0001 nD.

[0041] During use, lower the L1-L5 liftable sampling probes to different heights in the liquid material container in sequence, extract the liquids from different liquid layers into the refractometer sample cell, measure the refractive index based on the principle of the dual-wavelength critical angle method, and perform temperature compensation on the refractive index.

[0042] According to the critical angle method to measure the refractive index and perform temperature compensation (non-linear characteristics of sugar spice solutions), the formula used is: n real =n k +0.0001(T - 25 - 0.0000008(T - 25) 3 where T is the current temperature, 25 is the set standard temperature, n k is the refractive index measured based on the principle of the dual-wavelength critical angle method, and n real is the refractive index obtained after temperature compensation.

[0043] After the above steps, the densities at 5 measurement sites are obtained ρ 1 、 ρ 2 、 ρ 3 、 ρ 4 、 ρ 5 。

[0044] Specifically, after obtaining the particle distribution, density stratification distribution, and refractive index stratification distribution of the liquid material container, align the time stamps of the particle distribution, density stratification distribution, and refractive index stratification distribution, and then determine the liquid material risk mode, such as precipitation risk or stratification risk (density / refractive index) according to the aligned particle distribution, density stratification distribution, and refractive index stratification distribution; then automatically match the stirring mode according to the pre-set risk rules, and control at least one stirring unit of the stirrer to work. It can be understood that the priority of the precipitation risk is greater than that of the stratification risk.

[0045] In this application, the liquid material risk modes include high risk of global precipitation, high risk of local precipitation, high risk of multi-layer density, high risk of refractive index, and high risk of single-layer density; Among them, high risk of global precipitation > high risk of local precipitation > high risk of multi-layer density > high risk of refractive index > high risk of single-layer density; If multiple liquid material risk modes exist simultaneously, at least one stirring unit of the stirrer is controlled to operate according to the liquid material risk mode with a higher priority.

[0046] Specifically, at least one stirring unit of the stirrer is controlled to operate according to the liquid material risk type and the dynamic risk level, and different stirring modes are executed, including: When the liquid material risk mode is high risk of local precipitation, the stirring unit in the area with high risk of local precipitation is controlled to perform local stirring according to the first stirring mode; When the liquid material risk mode is high risk of global precipitation, all stirring units are controlled to perform global stirring according to the second stirring mode; When the liquid material risk mode is high risk of single-layer density, the stirring unit in the area with high risk of single-layer density is controlled to perform local stirring according to the third stirring mode; When the liquid material risk mode is high risk of multi-layer density, the stirring unit in the area with high risk of multi-layer density is controlled to perform cooperative stirring according to the fourth stirring mode; When the liquid material risk mode is high risk of refractive index, the stirring unit in the area with high risk of refractive index is controlled to perform cooperative stirring according to the fifth stirring mode.

[0047] For easy understanding, possible examples with specific values are given in this embodiment: When the liquid material risk mode is high risk of local precipitation (for example, the particle density ≥ 30 particles / cm³ or there are particles with a particle size > 200 μm), the stirring unit in the area with high risk of local precipitation is controlled to perform local stirring according to the first stirring mode; Preferably, the first stirring mode is 300 - 400 RPM, and the stirring duration is 30 seconds × 3 times; When the liquid material risk mode is high risk of global precipitation (for example, the difference in particle density between adjacent 3 grid partitions > 15 particles / cm³), all stirring units are controlled to perform global stirring according to the second stirring mode; Preferably, the second stirring mode is a rotational speed range of 500 - 600 RPM, and the stirring duration is 3 minutes; When the liquid material risk mode is high risk of single-layer density (for example, ∆ρmax ≥ 25 kg / m^3 or there is an abnormal density inversion), the stirring unit in the area with high risk of single-layer density is controlled to perform local stirring according to the third stirring mode; Preferably, the third stirring mode is 200 - 250 RPM, and the stirring duration is 15 seconds; When the feed liquid risk mode is multi-layer density high risk (for example, abnormal density differences occur in three adjacent regions and last for at least 4 minutes), control the stirring units in the region of multi-layer density high risk to perform cooperative stirring according to the fourth stirring mode; for example, the stirring units corresponding to the region of multi-layer density high risk are A i and A i+1 , then the fourth stirring mode is A i and A i+1 for cooperative stirring, with the rotation speed range of 1500 RPM + 450 RPM and the stirring duration of 2 minutes; When the feed liquid risk mode is refractive index high risk (for example, ∆n_max ≥ 0.0030 or continuous abnormal detection of refractive index inversion), control the stirring units in the region of refractive index high risk to perform cooperative stirring according to the fifth stirring mode; for example, the stirring units corresponding to the region of refractive index high risk are A i and A i+1 , then the fifth stirring mode is A i and A i+1 for cooperative stirring, with the rotation speed range of 300 RPM + 280 RPM and the stirring duration of 1 minute.

[0048] Specifically, before stirring, the platform terminal system transmits instructions (including the execution area, rotation speed, direction, duration) to the stirrer according to the actual situation of the risks in each area and checks the safety limits (torque / vibration / temperature).

[0049] It can be understood that since the sugar flavoring is a high-viscosity feed liquid, after controlling at least one stirring unit of the stirrer to work, adjust the rotation speed of the stirring unit according to the viscosity of the feed liquid; Among them, when the viscosity of the feed liquid is greater than or equal to the viscosity threshold, according to the high-viscosity fluid algorithm, dynamically adjust the rotation speed of the stirring unit in combination with the viscosity of the feed liquid, and the formula is as follows: N real = N0 × (500 / μ) 0.5 , In the formula, N0 is the initially set rotation speed; μ is the viscosity of the feed liquid, and the unit is cP; When the viscosity decreases with the stirring time due to shear thinning and the viscosity of the feed liquid is less than the viscosity threshold, use the progressive acceleration formula to dynamically adjust the rotation speed of the stirring unit, and the formula is as follows: N (t) = N0 × (1 + 0.05t) In the formula, N (t) is the target rotation speed at time t, and N set is the initially set rotation speed.

[0050] In this embodiment, a plurality of independently operating stirring units of the present invention are arranged on the central axis from bottom to top, and at least one stirring unit can be controlled to work according to the current liquid risk mode of the liquid container, such as large particles, sediment, and stratification risk, so as to accurately realize the mixing of the sugar and spice liquid in the liquid container; Furthermore, a detection module and a stirring module are cooperatively controlled, which can realize the full-dimensional real-time monitoring of the quality of the sugar and spice liquid, and realize the automatic setting of the stirring device, improve the production efficiency, solve the problem of stratification or precipitation of the sugar and spice liquid during the temporary storage time, reduce the raw materials lost by violently stirring the liquid or blowing away the precipitated particles, ensure the uniformity of the sugar and spice liquid, and provide a guarantee for the subsequent processes.

[0051] Embodiment 2 The difference between this embodiment and Embodiment 1 is that during the stirring process, cross-region compensation is also carried out for local stirring. The platform system has a self-adjusting compensation algorithm, namely the computational fluid dynamics prediction model algorithm: Among them, Fmixer is the force field generated by each paddle blade, which can predict the cross-region influence of single-region stirring, and dynamically adjust the stirring parameters of adjacent regions according to the model output, v is the rotation speed; p is the pressure.

[0052] Specifically, the actual compensation scenarios include: ① Only the first stirring unit A1 at the bottom operates, and the high-viscosity sugar liquid causes a delay in vortex transfer, exacerbating the stratification in the A2 area; ② Only the second stirring unit A2 in the middle operates, causing fluctuations in the refractive index sampling of the upper layer.

[0053] Therefore, after controlling at least one stirring unit of the stirrer to work, if the stirring unit performs local stirring according to the first stirring mode or the third stirring mode, it is necessary to control other stirring units to rotate for mechanical field compensation; Among them, if only the first stirring unit A1 at the bottom operates, the liquid is monitored in real time based on the densitometer. When the average density of any two adjacent height-stratified layers is greater than the density threshold (for example, Δ >15 kg / m³), the second stirring unit A2 in the middle is started to operate in a low-speed (50 RPM) reverse mode to balance the pressure gradient; If only the second stirring unit A2 in the middle operates, the third stirring unit A3 at the top is started to operate in a low-speed (100 RPM) forward mode to stabilize the liquid surface.

[0054] Embodiment 3 This embodiment provides a liquid mixing and stirring method applicable to the sugar and spice kitchen in tobacco processing, as Figure 3 shown, including the following steps: Obtain the particle distribution, density stratification distribution, and refractive index stratification distribution of the feed liquid container, and determine the feed liquid risk mode based on the particle distribution, density stratification distribution, and refractive index stratification distribution; Control at least one stirring unit of the stirrer to work according to the feed liquid risk mode, and execute different stirring modes.

[0055] Specifically, determining the feed liquid risk mode based on the particle distribution, density stratification distribution, and refractive index stratification distribution includes the following steps: For the particle distribution data, judge whether there are abnormal particles or abnormal distribution density in each grid partition based on the preset particle size classification standard and particle distribution density classification standard, and mark the particle distribution status; Among them, if it is judged that the particles in the grid partition satisfy the particle density ≥ particle density threshold (for example, particle density ≥ 30 particles / cm³), or it is judged that there are particles with particle size > particle size threshold in the grid partition (for example, particle size > 200 μm), then it is determined that the grid partition is a high-risk area for local precipitation; If at least three adjacent grid partitions are all high-risk areas for local precipitation, and the particle density difference between any two adjacent grid partitions > preset particle density difference threshold (for example, particle density difference > 15 particles / cm³), then mark the entire feed liquid solution as a high-risk area for global precipitation; For the density stratification distribution, calculate the average density of two adjacent height stratifications respectively and calculate the maximum density difference, and perform density inversion detection, and judge density abnormality based on the maximum density difference and the density inversion detection result; If the maximum density difference ≥ density difference abnormality threshold (for example, maximum density difference ∆ρ max ≥ 25 kg / m 3 ), then mark the corresponding height stratification as a high-risk area for single-layer density; If at least three adjacent height stratifications all have density inversion and the duration is greater than the preset time (lasting 4 minutes), then mark the corresponding height stratification as a high-risk area for multi-layer density; For the refractive index stratification distribution data, calculate the average refractive index of two adjacent height stratifications respectively and calculate the maximum refractive index difference, and perform refractive index inversion detection, and judge refractive index abnormality based on the maximum refractive index difference and the refractive index inversion detection result; Among them, if the maximum refractive index difference ≥ refractive index difference abnormality threshold (for example, maximum refractive index difference ∆n max ≥ 0.0030), or at least three adjacent height stratifications all have refractive index inversion, then mark the corresponding height stratification as a high-risk area for refractive index.

[0056] It is understandable that the dynamic risk score of the liquid mixture quality can also be calculated based on the particle distribution, density stratification distribution, and refractive index stratification distribution after alignment. The risk model adopted is: S (t) =a × particle density / k + b × ∆ρ / l + c × ∆n / m Where a, b, and c are risk weights respectively, a + b + c = 1, k is the abnormal threshold of particle density; l is the abnormal threshold of density difference, and m is the abnormal threshold of light shielding rate difference.

[0057] Before use, the risk weights are allocated according to user requirements. For example, if the precipitation risk is at the highest level, the risk weight of particle density is set higher.

[0058] It should be noted that for multiple data conflicts, a fusion and resolution mechanism is adopted: ① When there is a conflict between the endoscope and the density measurement unit (such as the endoscope shows precipitation but the density is normal), cross-validation is started (that is, the endoscope repeats scanning the abnormal area 3 times and takes the median value; the density measurement unit encrypts the sampling for 30 seconds); ② Dynamic weight adjustment (when the detected viscosity > 1000 cP, since high viscosity is more likely to cause precipitation, the weight of the endoscope is increased to 60%, and when rapid stratification is detected, that is, the change rate > 10 kg / m³ / min, the weight of the density measurement unit is increased to 40%); During stirring, the platform monitors the entire working process in real time and synchronizes the data to each module in real time for issuing accurate instructions.

[0059] Furthermore, after obtaining the dynamic risk score, the risk level is divided according to the dynamic risk score. When the risk score is in the first interval, it is marked as high risk and a red alert report is generated; when the risk score is in the second interval, it is marked as medium risk, prompting manual inspection and shortening the detection cycle to 2 h; when the risk score is in the third interval, it is marked as low risk, only recording the data and maintaining the default cycle; Among them, the first interval is greater than the second interval which is greater than the third interval.

[0060] For example, the first interval is set to 0.7 - 1.0, the second interval is 0.4 - 0.69, and the third interval is 0 - 0.39. Then when the risk score is 0.7 - 1.0, it is marked as "high risk"; when the risk score is 0.4 - 0.69, it is marked as "medium risk"; when the risk score < 0.4, it is marked as "low risk".

[0061] Furthermore, while the platform terminal system calculates the dynamic risk score based on the measurement data of each measurement unit and the risk model, it also synchronizes and correlates the measurement data of each measurement unit to the three-dimensional coordinate model of the tank body for marking the abnormal spatial position.

[0062] It can be understood that the liquid material risk modes include high global precipitation risk, high local precipitation risk, high multi-layer density risk, high refractive index risk, and high single-layer density risk; Among them, high global precipitation risk > high local precipitation risk > high multi-layer density risk > high refractive index risk > high single-layer density risk; If multiple liquid material risk modes exist simultaneously, at least one stirring unit of the stirrer is controlled to work according to the liquid material risk mode with a higher priority.

[0063] Specifically, at least one stirring unit of the stirrer is controlled to work according to the liquid material risk type and the dynamic risk level. For implementing different stirring modes, the steps described in Embodiment 1 can be referred to and will not be elaborated here.

[0064] Furthermore, while the platform terminal system calculates the dynamic risk score of the liquid material mixing quality, it also synchronously correlates the aligned partition particle distribution and stratification distribution to the three-dimensional coordinate model of the tank body and marks the abnormal areas, so as to facilitate the staff to intuitively obtain the mixing quality of the liquid material in the liquid material container.

[0065] Embodiment 4 The difference between this embodiment and Embodiment 3 is that after the liquid material mixing and stirring work, a re-inspection is carried out after standing for a specific time.

[0066] Specifically, the particle distribution, density distribution, and refractive index distribution in the liquid material container are re-inspected in the order of the density measurement unit, the refractive index measurement unit, and the fiber optic industrial endoscope unit, and the improvement rate R is calculated; R = (initial value - re-inspection value) / initial value × 100% If the improvement rate is less than the first threshold, the stirring unit in the area with high local precipitation risk is controlled to perform local stirring according to the sixth stirring mode, or the stirring unit in the area with high stratification anomaly risk is controlled to perform local stirring according to the seventh stirring mode; If the improvement rate is less than the second threshold, where the second threshold is less than the first threshold, the refractive index measurement unit is triggered to accurately position and aspirate particles; For example, when R < 30%, if the precipitation is not eliminated, the sixth stirring mode is that the rotation speed is increased by 20% and the duration is extended by 50%; if the stratification anomaly is not eliminated, the seventh stirring mode is a high-low speed alternating mode (i.e., 500 RPM / 30 seconds + 300 RPM / 15 seconds); when R < 10%, the refractometer is automatically triggered to accurately position and aspirate particles.

[0067] If the re-inspection fails twice in a row, an alarm is triggered and the manual mode is switched to, allowing manual remote adjustment of the stirring parameters.

[0068] In addition, record the entire data adjustment process after stirring. For successful cases, the parameter combinations are stored in the platform system library; use the LSTM model to predict the risk trend, and adjust the detection frequency and stirring parameters 12 minutes in advance; when the improvement rate is > 85% for three consecutive times, automatically optimize the detection process.

[0069] It should be understood that although the steps in the flowcharts involved in the above embodiments are shown in sequence according to the arrows, these steps do not necessarily have to be executed in the order indicated by the arrows. Unless there is a clear indication in this article, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, at least some of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages. These steps or stages do not necessarily have to be executed at the same time, but can be executed at different times. The execution order of these steps or stages does not necessarily have to be sequential, but can be executed alternately or in turn with at least some of the steps or stages in other steps or other steps.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific implementation manners of the present invention or perform equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A liquid material mixing and stirring device applicable to a tobacco processing sugar spice kitchen, characterized in that, Comprising: A stirrer, the stirrer including a central shaft and a plurality of independently operating stirring units arranged on the central shaft from bottom to top; A platform terminal system, configured to obtain the particle distribution, density stratification distribution, and refractive index stratification distribution of a liquid material container, determine a liquid material risk mode based on the particle distribution, density stratification distribution, and refractive index stratification distribution, and control at least one stirring unit of the stirrer to operate according to the liquid material risk mode, performing different stirring modes.

2. The liquid material mixing and stirring device applicable to a tobacco processing sugar flavor kitchen according to claim 1, wherein: The first stirring unit is arranged at the bottom and includes a five-blade propeller and a first driving unit; the second stirring unit is arranged in the middle and includes a three-blade oblique cutting paddle and a second driving unit; the third stirring unit is arranged at the top and includes a two-blade flat paddle and a third driving unit; The drive shafts of the first driving unit, the second driving unit, and the third driving unit are sleeved outside the central shaft from bottom to top to drive the corresponding paddles to rotate.

3. A liquid material mixing and stirring device applicable to a tobacco processing sugar flavor kitchen according to claim 1 or 2, characterized in that, The liquid material risk modes include high global precipitation risk, high local precipitation risk, high multi-layer density risk, high refractive index risk, and high single-layer density risk; Among them, high global precipitation risk > high local precipitation risk > high multi-layer density risk > high refractive index risk > high single-layer density risk; If multiple liquid material risk modes exist simultaneously, control at least one stirring unit of the stirrer to operate according to the liquid material risk mode with a higher priority.

4. A liquid material mixing and stirring device applicable to a tobacco processing sugar spice kitchen, characterized in that, Control at least one stirring unit of the stirrer to operate according to the liquid material risk type and dynamic risk level, performing different stirring modes, including: When the liquid material risk mode is high local precipitation risk, control the stirring unit in the area where the high local precipitation risk is located to perform local stirring according to the first stirring mode; When the liquid material risk mode is high global precipitation risk, control all stirring units to perform global stirring according to the second stirring mode; When the liquid material risk mode is high single-layer density risk, control the stirring unit in the area where the high single-layer density risk is located to perform local stirring according to the third stirring mode; When the liquid material risk mode is high multi-layer density risk, control the stirring unit in the area where the high multi-layer density risk is located to perform coordinated stirring according to the fourth stirring mode; When the liquid material risk mode is high refractive index risk, control the stirring unit in the area where the high refractive index risk is located to perform coordinated stirring according to the fifth stirring mode.

5. A liquid material mixing and stirring device applicable to a tobacco processing sugar flavor kitchen, according to claim 1 or 2 or 4, characterized in that, It further includes a detection module, and the detection module includes: An optical fiber industrial endoscope unit, configured to perform three-dimensional grid scanning on the liquid material in the liquid material container, and obtain the grid partition particle distribution of the liquid material in the liquid material container based on the scanned image; A density measurement unit, configured to obtain the density stratification distribution of the liquid material in the liquid material container; A refractive index measurement unit, configured to obtain the refractive index stratification distribution of the liquid material in the liquid material container; Among them, the initial detection sequence is: the optical fiber industrial endoscope unit, the density measurement unit, and the refractive index measurement unit.

6. A method for mixing and stirring a liquid material suitable for a tobacco processing sugar spice kitchen, based on the liquid material mixing and stirring device according to any one of claims 1-5, characterized in that, Including the following steps: Obtain the particle distribution, density stratification distribution, and refractive index stratification distribution of the liquid material container, and determine the liquid material risk mode based on the particle distribution, density stratification distribution, and refractive index stratification distribution; Control at least one stirring unit of the stirrer to operate according to the liquid material risk mode, performing different stirring modes.

7. The liquid material mixing and stirring device applicable to a tobacco processing sugar spice kitchen according to claim 6, characterized in that, Determine the risk mode of the liquid material based on particle distribution, density stratification distribution, and refractive index stratification distribution, including the following steps: For the particle distribution data, judge whether there are abnormal particles or abnormal distribution density in each grid partition based on the preset particle size classification standard and particle distribution density classification standard, and mark the particle distribution status; Among them, if it is judged that the particles in the grid partition satisfy the particle density ≥ particle density threshold, or it is judged that there are particles with particle size > particle size threshold in the grid partition, then it is determined that the grid partition is a high-risk area for local precipitation; If at least three adjacent grid partitions are all high-risk areas for local precipitation, and the particle density difference between any two adjacent grid partitions > preset particle density difference threshold, then mark the entire liquid material solution as a high-risk area for global precipitation; For the density stratification distribution, calculate the average density of two adjacent height stratifications respectively and calculate the maximum density difference, and perform density inversion detection, and judge density abnormality based on the maximum density difference and the density inversion detection result; If the maximum density difference ≥ density difference abnormality threshold, then mark the corresponding height stratification as a high-risk for single-layer density; If at least three adjacent height stratifications all have density inversion and the duration is greater than the preset time, then mark the corresponding height stratification as a high-risk for multi-layer density; For the refractive index stratification distribution data, calculate the average refractive index of two adjacent height stratifications respectively and calculate the maximum refractive index difference, and perform refractive index inversion detection, and judge refractive index abnormality based on the maximum refractive index difference and the refractive index inversion detection result; Among them, if the maximum refractive index difference ≥ refractive index difference abnormality threshold, or at least three adjacent height stratifications all have refractive index inversion, then mark the corresponding height stratification as a high-risk for refractive index; 8. A liquid material mixing and stirring device applicable to a tobacco processing sugar spice kitchen, characterized in that After controlling at least one stirring unit of the stirrer to work, adjust the rotation speed of the stirring unit according to the viscosity of the liquid material; Among them, when the viscosity of the liquid material is greater than or equal to the viscosity threshold, according to the high-viscosity fluid algorithm, dynamically adjust the rotation speed of the stirring unit in combination with the viscosity of the liquid material, and the formula is as follows: N real = N0 × (500 / μ) 0.5 , In the formula, N0 is the initially set rotation speed; μ is the viscosity of the liquid material, and the unit is cP; When the viscosity of the liquid material is less than the viscosity threshold, use the progressive acceleration formula to dynamically adjust the rotation speed of the stirring unit, and the formula is as follows: N (t) = N0 × (1 + 0.05t) where N (t) is the target rotational speed at time t, and N set is the initially set rotational speed.

9. The liquid material mixing and stirring device applicable to a tobacco processing sugar spice kitchen according to claim 6, wherein After controlling at least one stirring unit of the stirrer to work, if the stirring unit performs local stirring according to the first stirring mode or the third stirring mode, it is necessary to control other stirring units to rotate to perform compensation for the mechanical field; Among them, if only the first stirring unit at the bottom is running, monitor the liquid material in real time based on the densitometer. When the average density of any two adjacent height stratifications is greater than the density threshold, start the second stirring unit in the middle to run in a low-speed reverse mode; If only the second stirring unit in the middle is running, start the third stirring unit at the top to run in a low-speed forward mode.

10. A liquid material mixing and stirring device applicable to a tobacco processing sugar flavor kitchen, characterized in that After the liquid material is mixed and stirred, after standing for a specific time, re-inspect the particle distribution, density stratification distribution, and refractive index stratification distribution in the liquid material container in the order of the density measurement unit, refractive index measurement unit, and fiber optic industrial endoscope unit, and calculate the improvement rate; If the improvement rate is less than the first threshold, control the stirring unit in the area with high risk of local precipitation to perform local stirring according to the sixth stirring mode, or control the stirring unit in the area with high risk of stratification anomaly to perform local stirring according to the seventh stirring mode; If the improvement rate is less than the second threshold, where the second threshold is less than the first threshold, trigger the refractive index measurement unit to accurately locate and aspirate particles; If the re-inspection fails twice in a row, trigger an alarm and switch to the manual mode, allowing manual remote adjustment of the stirring parameters.

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