Material viscosity online measurement method and system for mixing and stirring equipment

Abstract

The invention relates to the technical field of viscosity measurement, and discloses a material viscosity online measurement method and system for mixing and stirring equipment, the system comprises a kneading pot and a stirring paddle, the stirring paddle is arranged in the kneading pot, and a shearing gap is formed between the bottom of the stirring paddle and the bottom of the kneading pot; the reduction gearbox is arranged at the top of the kneading pot, the output end of the reduction gearbox is connected with the stirring paddle, and the reduction gearbox is used for driving the stirring paddle; the top of the viscosity sensor is embedded in the bottom of the kneading pot; one end of the first communication cable is connected with the viscosity sensor; one end of the data acquisition unit is connected with one end, far away from the viscosity sensor, of the first communication cable, and the data acquisition unit is used for acquiring viscosity sensor data; one end of the second communication cable is connected with the output end of the data collector; and the data processing module is connected with one end, far away from the data collector, of the second communication cable. According to the invention, on-line viscosity measurement of the material is realized.

Description

Technical Field

[0001] This invention relates to the field of viscosity measurement technology, and more specifically, to a method and system for online measurement of material viscosity in mixing and stirring equipment. Background Technology

[0002] Vertical kneaders are key equipment for the research and production of solid propellants and explosives. Energetic materials generate huge viscous resistance during mixing, and the viscosity of the materials and its changes have a significant impact on the safety and performance of the mixing equipment.

[0003] Energetic materials (such as AP and RDX) are subjected to high shear forces during mixing, and sudden viscosity changes may cause abnormal fluctuations in equipment torque. Online viscosity monitoring can capture viscosity change trends in real time, and automatically trigger shutdown protection when the detected torque exceeds the safety threshold, effectively preventing combustion and explosion accidents caused by local overheating or friction. Online monitoring can effectively ensure the safety of the mixing process.

[0004] Online monitoring can optimize mixing and improve uniformity. The viscosity of non-Newtonian fluids (such as high-solids-content slurries) varies power-lawly with shear rate. Online measurement can dynamically provide feedback on differences in viscosity distribution, guiding adjustments to impeller speed (typically controlled at 20-60 rpm) and clearance (<5 mm) to ensure micron-level dispersion of solid particles in the liquid matrix. High-viscosity materials can cause a sharp increase in mixing torque. Online monitoring combined with variable frequency speed control technology can automatically reduce speed when viscosity suddenly increases, avoiding motor overload. Traditional offline monitoring suffers from hysteresis, while online measurement can achieve millisecond-level response, preventing equipment overload damage.

[0005] In summary, online viscosity measurement is a core technological guarantee for the safe and efficient operation of vertical kneaders, directly affecting the reliability and technological advancement of energetic material preparation. Viscosity data, linked with parameters such as temperature and shear rate, provides data support for process optimization, promoting intelligent production and digital process control.

[0006] Currently, there is a lack of synchronous measurement methods for material viscosity parameters in mixing equipment. Traditional viscosity sensors generally measure material viscosity by actively rotating or vibrating the rotor components. However, the safety of the testing method and the adaptability of the installation structure make it difficult to apply to kneading pots.

[0007] Patent CN202510863390 discloses a portable viscosity detection device and viscosity detection method, which uses a motor to drive the rotor to rotate, adds the liquid to be tested into the accommodating cavity, and uses a pressure sensor and magnetic grating plate technology to realize viscosity measurement, thus achieving high-precision offline viscosity measurement.

[0008] Patent CN202311371804 discloses an online viscosity detection device for flowable solid particulate explosives in the field of explosives. This device uses a positioning slider and a sliding plate on a material conveyor belt to trigger a force-sensing fork in a linkage detection mechanism, enabling the detection of viscosity for flowable particulate explosives produced in large quantities. Unlike this invention, this device uses a force sensor to detect the viscosity of solid particles, and requires a larger device size.

[0009] Patent CN202210011987 discloses a real-time viscosity detection device for kneading machine products. This device uses a viscosity conversion mechanism installed on the kneading pot, driven by a motor, to establish the action and reaction force relationship between the conversion mechanism and the stirring rod of the kneading pot, thus achieving online viscosity measurement. Its disadvantages are twofold: firstly, the device has a complex structure and requires a motor drive; secondly, the original kneading pot structure needs to be modified to accommodate the viscosity testing device.

[0010] Patent CN202021196486 discloses a vibration-type online viscosity detection device. This device inserts an energy transmission rod equipped with a vibration sensor into a container. By applying active vibration excitation to the energy rod, it measures the damping attenuation under the viscous resistance of the material, obtains a feedback signal, and calculates the material viscosity value. This device requires active vibration excitation and the probe needs to protrude into the material, making it unsuitable for kneading and mixing devices.

[0011] Patent CN201711469713 discloses a fluid viscosity measuring device and testing method. Based on the rotational method for measuring fluid resistance torque, a motor drives a rotor to rotate in the fluid under test via a coupling and gear set. The torque value is measured through a torque coupler, and the viscosity is calculated by measuring the torque difference under no-load and load conditions. Its disadvantage is that the gear transmission and multiple couplings during active drive introduce additional errors, affecting accuracy.

[0012] Therefore, it is necessary to provide a method and system for online measurement of material viscosity in mixing equipment to solve the problem that current vertical kneaders cannot obtain the material viscosity in real time during the mixing of energetic materials. Summary of the Invention

[0013] In view of this, the present invention proposes an online measurement method and system for material viscosity in mixing equipment, aiming to solve the problem that current vertical kneaders cannot obtain the material viscosity in real time during the mixing of energetic materials.

[0014] On one hand, this invention proposes an online material viscosity measurement system for mixing and stirring equipment, comprising: A kneading pot and a stirring paddle, wherein the stirring paddle is disposed inside the kneading pot and a shearing gap is provided between the bottom of the stirring paddle and the bottom of the kneading pot, and the kneading pot and the stirring paddle are used to mix and stir materials. A speed reduction gearbox is located at the top of the kneading pot, and the output end of the speed reduction gearbox is connected to the stirring paddle. The speed reduction gearbox is used to drive the stirring paddle. A viscosity sensor is embedded at the bottom of the kneading pot, and the viscosity sensor is installed at a distance R from the center of rotation of the bottom of the kneading pot. A first communication cable is connected at one end to the viscosity sensor. A data acquisition device is connected at one end to the end of the first communication cable away from the viscosity sensor, and the data acquisition device is used to acquire viscosity sensor data. The second communication cable is connected at one end to the output end of the data acquisition unit. A data processing module is connected to the end of the second communication cable away from the data acquisition device, wherein the data processing module is used to obtain the dynamic viscosity value of the material based on the viscosity sensor data.

[0015] Furthermore, the stirring paddle includes: The input end of the propeller is connected to the output end of the gearbox; The telecentric propeller has its input end connected to the output end of the gearbox, and the telecentric propeller is located on the upper part of the top of the viscosity sensor.

[0016] Furthermore, when the data processing module obtains the dynamic viscosity value of the material based on the viscosity sensor data, it includes: The distance h between the stirring paddle and the bottom of the pot, the shear torque M experienced by the viscosity sensor, the rotational speed n of the telecentric paddle, and the rotational radius R of the telecentric paddle are obtained. The dynamic viscosity value is calculated using the following formula: ; In the above formula, μ represents the dynamic viscosity value, in Pa·s; The calibration coefficient is obtained using a standard viscosity liquid, in Pa·s / Nm*(r / min); n is the rotational speed of the telecentric propeller, in r / min; R is the radius of rotation of the telecentric propeller, in m; M is the shear torque on the viscosity sensor, in N·m; h is the shear gap, in m.

[0017] Furthermore, the viscosity sensor includes: A measuring disc and a strain gauge support are provided. The measuring disc is fixed to the top of the strain gauge support and is embedded in the bottom of the kneading pot. The measuring disc and the strain gauge support are used to measure torque signals and pressure. A height adjustment disc is fixed to the bottom of the strain gauge bracket; The sensor housing is fitted over the outside of the strain gauge and the height adjustment disc; The device includes a locking disc, a locking nut, and a fixing bolt. The locking disc is located outside the height adjustment disc and is also located at the lower part of the sensor housing. The fixing bolt passes through the sensor housing, with one end of the fixing bolt extending into the bottom of the kneading pot and the other end of the fixing bolt abutting against the top of the locking disc. The locking nut is located on the fixing bolt, with the top of the locking nut fitting against the bottom of the sensor housing. An aviation plug socket is located at the bottom of the strain support.

[0018] Furthermore, the viscosity sensor also includes: A temperature sensor is embedded in the upper part of the strain gauge and is also located in the middle of the measuring plate.

[0019] Furthermore, the viscosity sensor also includes: A Y-shaped sealing ring is provided at the connection between the upper part of the measuring plate and the upper part of the bottom of the kneading pot; An O-ring is provided at the connection between the lower part of the measuring plate and the lower part of the bottom of the kneading pot.

[0020] Furthermore, the measuring disc has a cylindrical structure and is made of ultra-hard aluminum or stainless steel. The surface in contact with the material has intersecting grooves with a height of 1 mm to increase the friction between the material and the measuring disc.

[0021] Furthermore, the viscosity sensor is used to measure the torque signal generated by the material on the measuring disk during the stirring process, and obtain the shear viscosity after passing through the transmitter; it measures the pressure of the material on the measuring disk, obtains the pressure signal after passing through the transmitter, and then calculates the pressure through the area of ​​the measuring disk; it measures the PT100 platinum resistance and converts it into a temperature signal through the transmitter.

[0022] Furthermore, the data processing module is also used to display and plot curves in real time, including actual viscosity curves, calculated viscosity curves, dynamic viscosity curves, pressure curves, and temperature curves; automatically store data, including the original sampling points of all data and the dynamic viscosity values ​​after analysis and calculation; and perform viscosity calibration, including using a standard dynamic viscosity liquid to perform shear viscosity tests on the viscosity sensor at multiple rotational speeds, and calculating the shear viscosity and dynamic viscosity values.

[0023] Compared with existing technologies, the advantages of this invention are as follows: This invention uses a viscosity sensor installed at the bottom of the kneading pot, enabling online viscosity testing without active components; it eliminates the need for active components such as motors, utilizing the existing stirring paddle to generate force for viscosity testing; and it achieves high-precision online testing without multi-stage transmission components. This invention utilizes the shear force generated by the stirring fluid on the sensor's measuring plate to obtain a quantitative relationship between viscosity, torque, and angular velocity. Then, a standard viscosity liquid is used for viscosity coefficient calibration and correction, thereby obtaining the dynamic viscosity value of the material under its current state. The method and system proposed in this invention achieve viscosity measurement by utilizing the self-movement of the material being stirred in the kneading pot, with almost no change to the original kneading device structure. Simultaneously, it can integrate parameters such as pressure and temperature for real-time testing at the same location, solving the problem of online monitoring of energetic materials in the kneading pot. Specifically, this invention utilizes the periodic motion of the centrifugal impeller in a mixing device to create a Coeternal fluid motion of the material between the bottom of the impeller and the viscosity sensor at the bottom of the pot. The viscosity is then measured using Newton's fluid constitutive equation, enabling online testing without the need for actively moving parts and improving testing safety. The viscosity sensor body incorporates temperature and pressure measuring points in the sensor's measuring disk and strain gauge, allowing for simultaneous measurement of multiple parameters—viscosity, pressure, and temperature—at the same location. The obtained parameters can be effectively used to study the overall state of energetic materials during kneading and to monitor mixing effects. This invention achieves a direct conversion from measured torque to dynamic viscosity, simplifying the calculation process, avoiding the influence of structural parameters, and providing convenient and reliable dynamic viscosity results. This invention can be powered by a computer USB to achieve measurement and data processing, which improves safety; and aviation quick-connect plugs are used between the data acquisition unit and the viscosity sensor, and between the data acquisition unit and the data processing module, which facilitates disassembly and can meet the needs of frequent movement of the material pot; the viscosity sensor proposed in this invention is sealed between the measuring plate and the kneading pot through Y-type and O-type rubber sealing rings, which prevents material leakage at the edge of the sensor and also prevents pressure leakage during vacuuming.

[0024] On the other hand, this application also provides a method for online measurement of material viscosity for mixing and stirring equipment, including: The shear torque experienced by the viscosity sensor during the stirring process is measured, and the shear viscosity is obtained after passing through the transmitter. The pressure of the material on the measuring disc is measured, and the pressure signal is obtained after passing through the transmitter. The pressure is then calculated by the area of ​​the measuring disc. The PT100 platinum resistance thermometer is measured and converted into a temperature signal by a transmitter. Obtain the distance h between the stirring paddle and the bottom of the pot, the shear torque M experienced by the viscosity sensor, the rotational speed n and the radius of rotation R of the telecentric paddle, and calculate the dynamic viscosity value using the following formula: ; In the above formula, μ represents the dynamic viscosity value, in Pa·s; The calibration coefficient is obtained using a standard viscosity liquid, in Pa·s / Nm*(r / min); n is the rotational speed of the telecentric propeller, in r / min; R is the radius of rotation of the telecentric propeller, in m; M is the shear torque on the viscosity sensor, in N·m; h is the shear gap, in m. It displays and plots curves in real time, including the actual viscosity curve, calculated viscosity curve, dynamic viscosity curve, pressure curve, and temperature curve of the material; Data is automatically stored, including all original sampling points and the dynamic viscosity values ​​after analysis and calculation; Viscosity calibration includes performing shear viscosity tests on the viscosity sensor at multiple rotational speeds using a standard dynamic viscosity liquid, and calculating the shear viscosity and dynamic viscosity.

[0025] It is understood that the online material viscosity measurement method and system for mixing equipment provided in this application have the same beneficial effects, and will not be described in detail here. Attached Figure Description

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a structural diagram of an online material viscosity measurement system for mixing and stirring equipment provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a viscosity sensor provided in an embodiment of the present invention; Figure 3 A top view of a viscosity sensor provided in an embodiment of the present invention; Figure 4 The data processing module provided in this embodiment of the invention provides data results and graphs; Figure 5 A flowchart illustrating an online method for measuring the viscosity of materials in a mixing and stirring equipment, provided in an embodiment of the present invention.

[0027] In the diagram: 1. Gearbox; 2. Kneading pot; 3. Proximal propeller; 4. Telecentric propeller; 41. Telecentric propeller rotation speed n; 42. Telecentric propeller rotation radius R; 43. Shear torque M experienced by the viscosity sensor; 44. Shear gap h; 5. Viscosity sensor; 51. Temperature sensor; 52. Measuring disc; 53. Y-ring seal; 54. O-ring seal; 55. Bottom of the kneading pot; 56. Fixing bolt; 57. Sensor housing; 58. Strain gauge bracket; 59. Locking nut; 510. Locking disc; 511. Altitude adjustment disc; 512. Aviation connector; 6. First communication cable; 7. Data acquisition unit; 8. Second communication cable; 9. Data processing module; 91. Temperature curve; 92. Dynamic viscosity curve; 93. Calculated viscosity curve; 94. Actual viscosity curve; 95. Pressure curve; 96. Telecentric propeller period. Detailed Implementation

[0028] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey its scope to those skilled in the art. It should be noted that, unless otherwise specified, embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] In some embodiments of this application, see Figure 1 As shown, this embodiment provides an online material viscosity measurement system for mixing and stirring equipment, including: The kneading pot 2 and the stirring paddle are arranged inside the kneading pot 2. A shear gap is provided between the bottom of the stirring paddle and the bottom of the kneading pot 2. The kneading pot 2 and the stirring paddle are used to mix and stir materials. A reduction gearbox 1 is disposed on the top of the kneading pot 2. The output end of the reduction gearbox 1 is connected to the stirring paddle. The reduction gearbox 1 is used to drive the stirring paddle. The viscosity sensor 5 is embedded at the bottom of the kneading pot 2, and the viscosity sensor 5 is installed at the bottom of the kneading pot 2 at a distance of radius R from the center of rotation. The first communication cable 6 is connected at one end to the viscosity sensor 5; The data acquisition unit 7 is connected at one end to the end of the first communication cable 6 away from the viscosity sensor 5, and the data acquisition unit 7 is used to acquire data from the viscosity sensor 5. The second communication cable 8 is connected at one end to the output end of the data acquisition device 7; The data processing module 9 is connected to the end of the second communication cable 8 away from the data acquisition device 7, wherein the data processing module 9 is used to obtain the dynamic viscosity value of the material based on the viscosity sensor data.

[0030] It is understood that in this invention, the viscosity sensor 5 is installed at the bottom 55 of the kneading pot, enabling online viscosity testing without active components. This invention eliminates the need for active components such as motors, instead utilizing the existing stirring paddle to generate force for viscosity testing. Furthermore, this invention achieves high-precision online testing without multi-stage transmission components. This invention utilizes the shear force generated by the stirring fluid on the sensor measuring disk 52 to obtain a quantitative relationship between viscosity, torque, and angular velocity. Then, a standard viscosity liquid is used for viscosity coefficient calibration and correction, thereby obtaining the dynamic viscosity value of the material under the current state. The method and system proposed in this invention achieve viscosity measurement by utilizing the self-movement of the kneading pot 2 to stir the material, with almost no change to the original kneading device structure. Simultaneously, it can integrate parameters such as pressure and temperature for real-time testing at the same location, solving the problem of online monitoring of energetic materials in the kneading pot 2. Specifically, this invention utilizes the periodic 96-second motion of the centrifuge in a mixing device to create a Coeternal fluid motion of the material between the bottom of the impeller and the viscosity sensor 5 at the bottom of the pot. The viscosity is then measured using Newton's fluid constitutive equation, enabling online testing without the need for actively moving parts and improving testing safety. The viscosity sensor 5 incorporates temperature and pressure measuring points in the sensor measuring disk 52 and strain gauge 58, allowing for simultaneous measurement of multiple parameters (viscosity, pressure, and temperature) at the same location. The obtained parameters can be effectively used to study the overall state of energetic materials during the kneading process and monitor the mixing effect. This invention achieves a direct conversion from measured torque to dynamic viscosity, simplifying the calculation process, avoiding the influence of structural parameters, and providing convenient and reliable dynamic viscosity results. This invention can be powered by a computer USB to achieve measurement and data processing, which improves safety; and aviation quick-connect plugs are used between the data acquisition unit 7 and the viscosity sensor 5, and between the data acquisition unit 7 and the data processing module 9, which facilitates disassembly and can meet the needs of frequent movement of the material pot; the viscosity sensor 5 and the kneading pot 2 proposed in this invention are sealed between the measuring plate 52 and the pot body of the kneading pot 2 by Y-type and O-type rubber sealing rings, which prevents material leakage at the edge of the sensor and also prevents pressure leakage during vacuuming.

[0031] In some embodiments of this application, the stirring paddle includes: The input end of the propeller 3 is connected to the output end of the gearbox 1; The telecentric propeller 4 has its input end connected to the output end of the gearbox 1, and the telecentric propeller 4 is located on the upper part of the top of the viscosity sensor 5.

[0032] In some embodiments of this application, when the data processing module 9 obtains the dynamic viscosity value of the material based on the data from the viscosity sensor 5, it includes: The distance h between the stirring paddle and the bottom of the pot (i.e., the shear gap h44), the shear torque M43 experienced by the viscosity sensor, the rotational speed n41 of the telecentric paddle, and the rotational radius R42 of the telecentric paddle are obtained. The dynamic viscosity value is calculated using the following formula: ; In the above formula, μ represents the dynamic viscosity value, in Pa·s; The calibration coefficient is obtained using a standard viscosity liquid, in Pa·s / Nm*(r / min); n is the rotational speed of the telecentric propeller 4, in r / min; R is the rotational radius of the telecentric propeller 4, in m; M is the shear torque experienced by the viscosity sensor 5, in N·m; h is the shear gap, in m.

[0033] Specifically, the derivation process of the dynamic viscosity value is as follows: ; In the above formula, μ represents the dynamic viscosity value, in Pa·s; Shear stress, unit N / m 2 ; This represents the shear rate, expressed in units of 1 / s. ; In the above formula, Shear torque is expressed in N·m. Indicates the radius of action of the torque, in meters (m). Represents the shear area, in meters (m²). 2 ; ; In the above formula, Represents angular velocity, in units of 1 / s; The distance from the agitator to the center of the sensor measuring disk 52 is represented by the radius of rotation of the centroidal impeller 4, in meters; h represents the shear gap, in meters. Based on the above formula and testing principle, by removing the fixed size of the viscosity sensor 5 and introducing a calibration coefficient, the relationship between dynamic viscosity and measurement data is obtained as follows: ; In the above formula, μ represents the dynamic viscosity value, in Pa·s; The calibration coefficient is obtained using a standard viscosity liquid, in Pa·s / Nm*(r / min); n is the rotational speed of the telecentric propeller 4, in r / min; R is the rotational radius of the telecentric propeller 4, in m; M is the shear torque experienced by the viscosity sensor 5, in N·m; h is the shear gap, in m.

[0034] See Figure 2-3 As shown, in some embodiments of this application, the viscosity sensor 5 includes: The measuring disc 52 and the strain support 58 are used to measure torque signals and pressure. The measuring disc 52 is fixed to the top of the strain support 58 and is embedded in the bottom 55 of the kneading pot. The height adjustment disc 511 is fixed to the bottom of the strain bracket 58; The sensor housing 57 is fitted over the outside of the strain bracket 58 and the height adjustment disc 511; The device includes a locking disc 510, a locking nut 59, and a fixing bolt 56. The locking disc 510 is located outside the height adjustment disc 511 and is also located at the lower part of the sensor housing 57. The fixing bolt 56 passes through the sensor housing 57, with one end of the fixing bolt 56 extending into the bottom 55 of the kneading pot and the other end of the fixing bolt 56 abutting against the top of the locking disc 510. The locking nut 59 is located on the fixing bolt 56, and the top of the locking nut 59 is in contact with the bottom of the sensor housing 57. An aviation plug socket 512 is disposed at the bottom of the strain bracket 58.

[0035] Specifically, the viscosity sensor 5 is positioned by a height adjustment disc 511, and is 1 mm above the measuring surface at the measuring position. The cable of the viscosity sensor 5 uses an aviation connector 512, which is embedded at the bottom of the viscosity sensor 5 and is used for power supply and signal transmission.

[0036] In some embodiments of this application, the viscosity sensor 5 further includes: Temperature sensor 51 is embedded in the upper part of the strain bracket 58, and temperature sensor 51 is also located in the middle of the measuring plate 52.

[0037] In some embodiments of this application, the viscosity sensor 5 further includes: Y-shaped sealing ring 53 is disposed at the connection between the upper part of the measuring plate 52 and the upper part of the bottom 55 of the kneading pot; An O-ring 54 is disposed at the connection between the lower part of the measuring plate 52 and the lower part of the bottom 55 of the kneading pot.

[0038] In some embodiments of this application, the measuring disk 52 has a cylindrical structure and is made of ultra-hard aluminum or stainless steel. The surface in contact with the material is provided with cross-shaped grooves with a height of 1 mm to increase the friction between the material and the measuring disk 52.

[0039] In some embodiments of this application, the viscosity sensor 5 is used to measure the torque signal generated by the material on the measuring disk 52 during the stirring process, and obtain the shear viscosity after passing through a transmitter; measure the pressure of the material on the measuring disk 52, obtain the pressure signal after passing through a transmitter, and then calculate the pressure through the area of ​​the measuring disk 52; and measure the PT100 platinum resistance, and convert it into a temperature signal through a transmitter.

[0040] In some embodiments of this application, the data processing module 9 is also used to display and plot curves in real time, including actual viscosity curve 94, calculated viscosity curve 93, dynamic viscosity curve 92, pressure curve 95, and temperature curve 91; automatic data storage, including the original sampling points of all data and the dynamic viscosity values ​​after analysis and calculation; viscosity calibration, including using a standard dynamic viscosity liquid to perform shear viscosity tests on the viscosity sensor 5 at multiple rotational speeds, and calculating the shear viscosity and dynamic viscosity values.

[0041] On the other hand, see Figure 5 As shown, this application also provides an online material viscosity measurement method for mixing and stirring equipment, applied to the above-mentioned online material viscosity measurement system for mixing and stirring equipment, comprising the following steps: S100: Measure the shear torque experienced by the viscosity sensor during the stirring process of the material, and obtain the shear viscosity after passing through the transmitter; S200: The pressure of the material on the measuring disc is measured, and the pressure signal is obtained after passing through the transmitter. The pressure is then calculated by the area of ​​the measuring disc. S300 measures a PT100 platinum resistance thermometer, which converts the signal into a temperature signal via a transmitter. S400: Obtain the distance h between the stirring paddle and the bottom of the pot, the shear torque M on the viscosity sensor, the rotational speed n and the rotational radius R of the telecentric paddle, and calculate the dynamic viscosity value. The dynamic viscosity value is calculated using the following formula: ; In the above formula, μ represents the dynamic viscosity value, in Pa·s; The calibration coefficient is obtained using a standard viscosity liquid, in Pa·s / Nm*(r / min); n is the rotational speed of the telecentric propeller, in r / min; R is the radius of rotation of the telecentric propeller, in m; M is the shear torque on the viscosity sensor, in N·m; h is the shear gap, in m. S500 displays and plots curves in real time, including the actual viscosity curve, calculated viscosity curve, dynamic viscosity curve, pressure curve, and temperature curve of the material. S600, automatic data storage, including all original sampling points and dynamic viscosity values ​​after analysis and calculation; S700 viscosity calibration includes using a standard dynamic viscosity liquid to perform shear viscosity tests on the viscosity sensor at multiple rotational speeds, and calculating the shear viscosity and dynamic viscosity.

[0042] Preferably, the workflow of the present invention is as follows: First, the sensor is installed. A through hole and a threaded hole for installing the sensor are machined in the bottom of the kneading pot. A through hole of Φ20.5mm±0.05mm is machined on the circumference of the center trajectory of the stirring paddle (in the case of a dual paddle, select the position of the distal paddle). Using this as the center, three M6 threaded holes are machined on a circumference of Φ44mm±0.1mm to fix the viscosity sensor. The viscosity sensor is fixed by three fixing bolts and positioning brackets. The height of the viscosity sensor relative to the bottom of the pot is adjusted so that it protrudes 1mm from the bottom of the pot, and then the nut is tightened.

[0043] Next, the dynamic viscosity coefficient was calculated. A viscosity sensor was connected to a data acquisition unit and testing software. The real-time viscosity data was zeroed, and then a standard viscosity material of 8 Pa·s to 20 Pa·s was injected. The material was stirred at 6 rpm and 10 rpm respectively, and the results were measured. Figure 4 The real-time data curve shown; the peak-to-peak value of the real-time viscosity is taken as the shear torque of the current material, and there is a difference between it and the standard viscosity. The relationship is represented by calculating the dynamic viscosity coefficient based on data from multiple rotational speed tests and taking the average value, thus obtaining... .

[0044] Thirdly, for viscosity testing of actual materials, open the testing software, input the estimated cycle, error and test time, select the cycle calculation method and display range, check the viscosity coefficient, pressure calibration coefficient and temperature calibration coefficient on the calibration interface; clear the viscosity data to zero, then press the "Start" button to start the formal test, and press the "Stop" button when finished.

[0045] Furthermore, this invention provides a viscosity sensor with a measuring disc structure that enables simultaneous measurement of three parameters: viscosity, pressure, and temperature. A dedicated software system allows for real-time monitoring of the process. Compared to existing technologies, it offers advantages such as requiring no equipment modification, high measurement accuracy (viscosity resolution of 0.015 N·m), and automatic data recording.

[0046] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program goods. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program goods embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0047] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program goods according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0048] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0049] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0050] 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 it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An online viscosity measurement system for materials used in mixing and stirring equipment, characterized in that, include: A kneading pot and a stirring paddle, wherein the stirring paddle is disposed inside the kneading pot and a shearing gap is provided between the bottom of the stirring paddle and the bottom of the kneading pot, and the kneading pot and the stirring paddle are used to mix and stir materials. A speed reduction gearbox is located at the top of the kneading pot, and the output end of the speed reduction gearbox is connected to the stirring paddle. The speed reduction gearbox is used to drive the stirring paddle. A viscosity sensor is embedded at the bottom of the kneading pot, and the viscosity sensor is installed at a distance R from the center of rotation of the bottom of the kneading pot. A first communication cable is connected at one end to the viscosity sensor. A data acquisition device is connected at one end to the end of the first communication cable away from the viscosity sensor, and the data acquisition device is used to acquire viscosity sensor data. The second communication cable is connected at one end to the output end of the data acquisition unit. A data processing module is connected to the end of the second communication cable away from the data acquisition device, wherein the data processing module is used to obtain the dynamic viscosity value of the material based on the viscosity sensor data.

2. The online material viscosity measurement system for mixing and stirring equipment according to claim 1, characterized in that, The stirring paddle includes: The input end of the propeller is connected to the output end of the gearbox; The telecentric propeller has its input end connected to the output end of the gearbox, and the telecentric propeller is located on the upper part of the top of the viscosity sensor.

3. The online material viscosity measurement system for mixing and stirring equipment according to claim 2, characterized in that, When the data processing module obtains the dynamic viscosity value of the material based on the viscosity sensor data, it includes: The distance h between the stirring paddle and the bottom of the pot, the shear torque M experienced by the viscosity sensor, the rotational speed n of the telecentric paddle, and the rotational radius R of the telecentric paddle are obtained. The dynamic viscosity value is calculated using the following formula: ； In the above formula, μ represents the dynamic viscosity value, in Pa·s; The calibration coefficient is obtained using a standard viscosity liquid, in Pa·s / Nm*(r / min); n is the rotational speed of the telecentric propeller, in r / min; R is the radius of rotation of the telecentric propeller, in m; M is the shear torque on the viscosity sensor, in N·m; h is the shear gap, in m.

4. The online material viscosity measurement system for mixing and stirring equipment according to claim 1, characterized in that, The viscosity sensor includes: A measuring disc and a strain gauge support are provided. The measuring disc is fixed to the top of the strain gauge support and is embedded in the bottom of the kneading pot. The measuring disc and the strain gauge support are used to measure torque signals and pressure. A height adjustment disc is fixed to the bottom of the strain gauge bracket; The sensor housing is fitted over the outside of the strain gauge and the height adjustment disc; The device includes a locking disc, a locking nut, and a fixing bolt. The locking disc is located outside the height adjustment disc and is also located at the lower part of the sensor housing. The fixing bolt passes through the sensor housing, with one end of the fixing bolt extending into the bottom of the kneading pot and the other end of the fixing bolt abutting against the top of the locking disc. The locking nut is located on the fixing bolt, with the top of the locking nut fitting against the bottom of the sensor housing. An aviation plug socket is located at the bottom of the strain support.

5. The online material viscosity measurement system for mixing and stirring equipment according to claim 4, characterized in that, The viscosity sensor also includes: A temperature sensor is embedded in the upper part of the strain gauge and is also located in the middle of the measuring plate.

6. The online material viscosity measurement system for mixing and stirring equipment according to claim 5, characterized in that, The viscosity sensor also includes: A Y-shaped sealing ring is provided at the connection between the upper part of the measuring plate and the upper part of the bottom of the kneading pot; An O-ring is provided at the connection between the lower part of the measuring plate and the lower part of the bottom of the kneading pot.

7. The online material viscosity measurement system for mixing and stirring equipment according to claim 6, characterized in that, The measuring disc has a cylindrical structure and is made of ultra-hard aluminum or stainless steel. The surface that contacts the material has cross-shaped grooves with a height of 1 mm to increase the friction between the material and the measuring disc.

8. The online material viscosity measurement system for mixing and stirring equipment according to claim 7, characterized in that, The viscosity sensor is used to measure the torque signal generated by the material on the measuring plate during the stirring process, and obtains the shear viscosity after being transmitted by a transmitter; it measures the pressure of the material on the measuring plate, obtains the pressure signal after being transmitted by a transmitter, and then calculates the pressure by the area of ​​the measuring plate; it measures the PT100 platinum resistance and converts it into a temperature signal after being transmitted by a transmitter.

9. The online material viscosity measurement system for mixing and stirring equipment according to claim 8, characterized in that, The data processing module is also used to display and plot curves in real time, including actual viscosity curves, calculated viscosity curves, dynamic viscosity curves, pressure curves, and temperature curves; automatically store data, including the original sampling points of all data and the dynamic viscosity values ​​after analysis and calculation; and perform viscosity calibration, including using a standard dynamic viscosity liquid to perform shear viscosity tests on the viscosity sensor at multiple rotational speeds, and calculating the shear viscosity and dynamic viscosity values.

10. A method for online measurement of material viscosity in mixing and stirring equipment, applied to the online material viscosity measurement system for mixing and stirring equipment as described in any one of claims 1-9, characterized in that, include: The shear torque experienced by the viscosity sensor during the stirring process is measured, and the shear viscosity is obtained after passing through the transmitter. The pressure of the material on the measuring disc is measured, and the pressure signal is obtained after passing through the transmitter. The pressure is then calculated by the area of ​​the measuring disc. The PT100 platinum resistance thermometer is measured and converted into a temperature signal by a transmitter. Obtain the distance h between the stirring paddle and the bottom of the pot, the shear torque M experienced by the viscosity sensor, the rotational speed n and the radius of rotation R of the telecentric paddle, and calculate the dynamic viscosity value using the following formula: ； In the above formula, μ represents the dynamic viscosity value, in Pa·s; The calibration coefficient is obtained using a standard viscosity liquid, in Pa·s / Nm*(r / min); n is the rotational speed of the telecentric propeller, in r / min; R is the radius of rotation of the telecentric propeller, in m; M is the shear torque on the viscosity sensor, in N·m; h is the shear gap, in m. It displays and plots curves in real time, including the actual viscosity curve, calculated viscosity curve, dynamic viscosity curve, pressure curve, and temperature curve of the material; Data is automatically stored, including all original sampling points and the dynamic viscosity values ​​after analysis and calculation; Viscosity calibration includes performing shear viscosity tests on the viscosity sensor at multiple rotational speeds using a standard dynamic viscosity liquid, and calculating the shear viscosity and dynamic viscosity.

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