Viscosity testing device and method

Abstract

The invention provides a viscosity testing device and method. The testing device comprises a branch pipeline system, a testing unit, a pumping unit and a control unit, the branch pipeline system comprises a first branch pipeline, a second branch pipeline and a third branch pipeline which are communicated in sequence; the testing unit comprises a testing ball and a limiting piece, and the third branch pipeline comprises a transparent testing pipe; the pumping unit is arranged on the second branch pipeline and is used for pumping the to-be-tested liquid in the to-be-tested liquid conveying pipeline to the branch pipeline system and enabling the test ball to move at a constant speed within a preset distance; the control unit is used for determining the viscosity of the to-be-tested liquid according to the uniform motion speed of the test ball within the preset distance. The testing device provided by the invention can realize automatic testing of the viscosity of the to-be-tested liquid, reduces errors caused by manual operation, improves the testing efficiency and accuracy, and can be suitable for online real-time monitoring.

Description

Technical Field

[0001] This disclosure relates to the field of viscosity testing technology, and in particular to a viscosity testing apparatus and method. Background Technology

[0002] In the production process of polyacrylonitrile fiber, the viscosity of the dosing solution is a core parameter for controlling the degree of polymerization and spinning quality. Accurate and real-time viscosity detection is of great significance for ensuring product quality and optimizing production processes. Summary of the Invention

[0003] To address the problems existing in related technologies, this disclosure provides a viscosity testing device and method.

[0004] According to a first aspect of the present disclosure, a viscosity testing apparatus is provided, the testing apparatus comprising: A branch pipeline system, comprising a first branch pipeline, a second branch pipeline, and a third branch pipeline connected in sequence; the first branch pipeline and the third branch pipeline are respectively connected to a test liquid delivery pipeline, and the first branch pipeline and the third branch pipeline are respectively perpendicular to the test liquid delivery pipeline; The testing unit includes a test ball and a limiting component. The third branch pipeline includes a transparent test tube. The test ball is disposed inside the transparent test tube. The limiting component is disposed at both ends inside the transparent test tube to prevent the test ball from detaching from the transparent test tube. The transparent test tube is provided with a 0 mark and an end mark. The distance between the 0 mark and the end mark is a preset distance. A pumping unit is provided in the second branch pipeline. The pumping unit is used to pump the test liquid in the test liquid delivery pipeline to the branch pipeline system and make the test ball move at a constant speed within the preset distance. A control unit is used to determine the viscosity of the test liquid based on the speed at which the test ball moves at a constant speed within a preset distance.

[0005] In some embodiments of this disclosure, the testing device further includes a timing and position sensing unit, which includes at least two sets of non-contact sensors. The non-contact sensors are disposed on the outside of the transparent testing tube and correspond to the 0 mark and the endpoint mark. The timing and position sensing unit is used to detect the time taken for the test ball to travel the preset distance and to determine the speed at which the test ball moves at a constant speed within the preset distance. In some embodiments of this disclosure, the control unit includes a controller connected to the pumping unit and the timing and position sensing unit; the controller is used to determine the driving frequency coefficient of the metering pump in the pumping unit based on the movement speed, and to determine the viscosity of the liquid to be tested based on the driving frequency coefficient.

[0006] In some embodiments of this disclosure, the testing apparatus further includes a temperature control unit disposed between the pumping unit and the testing unit, and the temperature control unit is used to control the temperature of the test liquid flowing through the testing unit.

[0007] In some embodiments of this disclosure, the limiting member includes a hollow bracket, the diameter of which is smaller than the diameter of the test ball.

[0008] According to a second aspect of the present disclosure, a viscosity testing method is provided, the testing method being applied to the viscosity testing apparatus as described above, the testing method comprising: The control pumping unit pumps the test liquid in the test liquid delivery pipeline to the branch pipeline system, and makes the test ball move at a constant speed within a preset distance in the transparent test tube. The control unit determines the viscosity of the test liquid based on the speed at which the test ball moves at a constant speed within the preset distance.

[0009] In some embodiments of this disclosure, the control unit determines the viscosity of the test liquid based on the velocity of the test ball moving at a constant speed within the preset distance, including: The driving frequency coefficient of the metering pump in the pumping unit is determined by the movement speed. The viscosity of the test liquid is determined based on the mapping relationship between viscosity and driving frequency coefficient.

[0010] In some embodiments of this disclosure, the testing method further includes: Obtain the sample velocity of the test ball moving at a constant speed within the preset distance; Based on the sample velocity, determine the corresponding sample driving frequency coefficient; A mapping relationship between the viscosity and the driving frequency coefficient is established based on the sample velocity and the sample driving frequency coefficient.

[0011] In some embodiments of this disclosure, the testing method further includes: The accuracy of the determined viscosity of the test liquid is verified by comparing the motion speed of the test ball with the standard curve.

[0012] In some embodiments of this disclosure, the testing method further includes: Using the ball-dropping method, a variety of standard solutions with known viscosities are used to calculate the speed of the test ball based on the time required for the test ball to travel the preset distance, and a standard curve of the viscosity and the speed of movement is established.

[0013] The beneficial effects of this disclosure include, but are not limited to: the viscosity testing device provided by this disclosure directly tests the viscosity of the test liquid based on the classical falling ball method physical law. The test result is an absolute dynamic viscosity, independent of the material composition and flow rate of the test liquid, and does not rely on empirical formulas for correlation, resulting in strong comparability of test results. Furthermore, no electronic probe is immersed in the fluid during the testing process, completely eliminating probe contamination and fatigue, preventing material fatigue or signal drift problems, and ensuring long-term measurement stability. This testing device enables automated testing of the viscosity of the test liquid, reducing errors from manual operation, improving testing efficiency and accuracy, and is suitable for online real-time monitoring.

[0014] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of these embodiments. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the present disclosure, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without inventive effort.

[0016] Figure 1 This is a schematic diagram of a viscosity testing apparatus according to an exemplary embodiment of the present disclosure; Figure 2 This is a schematic diagram of a viscosity testing method according to an exemplary embodiment of the present disclosure; Figure 3 This is a schematic diagram of a viscosity testing method flow according to another exemplary embodiment of the present disclosure; Figure 4 This is a schematic diagram of a viscosity testing method flow according to another exemplary embodiment of the present disclosure; Figure 5 This is a schematic diagram of the standard curve in Embodiment 1 of this disclosure; Figure 6 This is a schematic diagram of the standard curve in Embodiment 3 of this disclosure. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions of this disclosure will be clearly and completely described below in conjunction with the embodiments of this disclosure. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this disclosure can be arbitrarily combined with each other.

[0018] In related technologies, the viscosity determination of polyacrylonitrile (PA) fiber production mainly relies on offline sampling laboratory analysis or online vibratory viscometers. Both methods have significant shortcomings: Inherent defects of online vibratory viscometers (such as metal rod vibratory viscometers): ① Probe contamination and film formation: PA solutions easily gel and scale on the probe surface, leading to severe drift in the measurement signal, requiring frequent shutdowns for cleaning, affecting production continuity; ② High temperature sensitivity: Vibration frequency is greatly affected by fluid temperature, and existing compensation models cannot fully correct for this, especially with significant deviations during temperature fluctuations; ③ Sensor fatigue and wear: Metal probes subjected to high-frequency vibration for extended periods are prone to material fatigue and performance degradation, requiring periodic replacement. Disadvantages of offline laboratory analysis: ① Severe lag: Sampling, delivery, and analysis are time-consuming, making real-time control of the production process impossible; ② Cumbersome and dangerous operation: PA solutions typically use strong solvents (such as N,N-dimethylformamide and dimethyl sulfoxide), posing safety and health risks with manual sampling and operation; ③ Poor sample representativeness: Point sampling cannot fully represent the continuous and homogeneous material state within the pipeline.

[0019] Based on this, this disclosure provides a viscosity testing device that directly tests the viscosity of the test liquid based on the classical falling ball method. The test result is an absolute dynamic viscosity, independent of the material composition and flow rate of the test liquid, and does not rely on empirical formulas, ensuring strong comparability of the test results. Furthermore, the testing process does not involve any electronic probe immersing in the fluid, completely eliminating probe contamination and fatigue, preventing material fatigue or signal drift issues, and ensuring long-term measurement stability. This testing device enables automated testing of the viscosity of the test liquid, reducing errors from manual operation, improving testing efficiency and accuracy, and is suitable for online real-time monitoring.

[0020] An exemplary embodiment of this disclosure provides a viscosity testing apparatus, such as... Figure 1As shown, the testing device 100 includes: a branch pipeline system 10, a testing unit 20, a pumping unit 30, and a control unit (not shown in the figure). The branch pipeline system 10 includes a first branch pipeline 11, a second branch pipeline 12, and a third branch pipeline 13 connected in sequence. The first branch pipeline 11 and the third branch pipeline 13 are respectively connected to the test liquid delivery pipeline 40, and are perpendicular to the test liquid delivery pipeline 40. The testing device 100 is equipped with a branch pipeline system 10 connected to the test liquid delivery pipeline 40. When the viscosity of the test liquid is to be tested, the test liquid enters the first branch pipeline 11 from the test liquid delivery pipeline 40, and then flows through the second branch pipeline 12 and the third branch pipeline 13 in sequence. After the test is completed, it returns to the test liquid delivery pipeline 40 through the third branch pipeline 13. This creates a bypass for the viscosity testing of the test liquid (such as the polyacrylonitrile raw material in the production process of polyacrylonitrile fiber). It can realize the real-time viscosity testing of the test liquid in the test liquid delivery pipeline 40 without interrupting the delivery of the test liquid in the test liquid delivery pipeline 40. Moreover, the test liquid after the test in the branch pipeline system 10 can still be delivered to the test liquid delivery pipeline 40 to continue to participate in the subsequent delivery and process flow, improving the real-time performance of the test liquid viscosity test without affecting the ongoing process flow.

[0021] The testing unit 20 includes a test ball 21 and limiting components. The third branch pipeline 13 includes a transparent test tube 23. The test ball 21 is disposed inside the transparent test tube 23, and the limiting components are disposed at both ends inside the transparent test tube 23 to prevent the test ball 21 from detaching from the transparent test tube 23. The transparent test tube 23 is provided with a 0 mark 24 and an end mark 25, and the distance between the 0 mark 24 and the end mark 25 is a preset distance. It should be noted that the test ball 21 can be a smooth, high-precision stainless steel ball or ceramic ball with a density greater than that of the liquid to be tested.

[0022] The movement range of the test ball 21 is restricted within the transparent test tube 23 by limiting components, preventing the test ball 21 from being washed away or entering the test liquid delivery pipeline 40. After the test, the test ball 21 can return to its initial position under the action of gravity. For example, the limiting components may include a first limiting component 221 located at the bottom of the transparent test tube 23 and a second limiting component 222 located at the top of the transparent test tube 23. The test ball 21 moves within the transparent test tube 23, which can be made of high-temperature resistant sapphire or high borosilicate glass. The inner wall of the transparent test tube 23 has a fully polished surface to minimize the impact of tube wall friction resistance on the test. The transparent test tube 23 is transparent and visible, allowing the movement state of the test ball 21 to be clearly observed. By observing the movement of the test ball 21 within the transparent test tube 23, such as whether the test ball 21 moves at a constant speed over a preset distance between the 0 mark 24 and the end mark 25, the viscosity of the test liquid can be tested based on the classic falling ball method physical principle.

[0023] A pumping unit 20 is installed in the second branch pipeline 12. The pumping unit 20 pumps the test liquid from the test liquid delivery pipeline 40 to the branch pipeline system 10, ensuring the test ball 21 moves at a constant speed within a preset distance. Traditional drop ball methods rely on gravity to drop the ball to test the viscosity of the test liquid. For high-viscosity test liquids, the ball falls slowly, resulting in a long testing time. For low-viscosity test liquids, a longer pipeline is required to ensure the ball moves at a constant speed for viscosity testing. In this embodiment, by installing a pumping unit 20 on the second branch pipeline 12, the flow rate of the test liquid in the branch pipeline system 10 is actively controlled, thereby controlling the test ball 21 to move at a constant speed within a preset distance, thus achieving the viscosity test of the test liquid. This also allows the testing device 100 to be applicable to testing a wide range of viscosity. The pumping unit 20 can be, for example, a metering pump, where the volumetric flow rate Q and the driving frequency coefficient f have a definite functional relationship: Q=q. f is a precision pump, where q is the displacement of the metering pump, which can be a high-precision gear pump or a plunger pump.

[0024] The control unit determines the viscosity of the test liquid based on the speed of the test ball 21 moving at a constant speed within a preset distance. This enables the testing device 100 to automate the viscosity testing of the test liquid, reducing errors from manual operation and improving testing efficiency and accuracy. It is suitable for online real-time monitoring. Furthermore, the control unit may also include a display for outputting and showing the viscosity value.

[0025] The viscosity testing device 100 provided in this embodiment directly tests the viscosity of the test liquid based on the classic falling ball method physical law. The test result is an absolute dynamic viscosity, which is independent of the material composition and flow rate of the test liquid and does not rely on empirical formulas, resulting in strong comparability of test results. Furthermore, no electronic probe is immersed in the fluid during the testing process, completely eliminating probe contamination and fatigue, preventing material fatigue or signal drift issues, and ensuring long-term measurement stability. This testing device 100 enables automated testing of the viscosity of the test liquid, reducing errors from manual operation, improving testing efficiency and accuracy, and is suitable for online real-time monitoring.

[0026] In one exemplary embodiment, such as Figure 1 As shown, the testing device 100 also includes a timing and position sensing unit, which includes at least two sets of non-contact sensors. The non-contact sensors are disposed on the outside of the transparent test tube 23 and correspond to the 0 mark 24 and the end mark 25. The timing and position sensing unit is used to detect the time taken for the test ball 21 to travel a preset distance and to determine the speed of the test ball moving at a constant speed within the preset distance. For example, the non-contact sensor can be a laser beam sensor or a photoelectric sensor. For instance, the timing and position sensing unit includes a first set of non-contact sensors 261 corresponding to the 0 mark and a second set of non-contact sensors 262 corresponding to the end mark. Furthermore, the timing and position sensing unit may also include a third set of non-contact sensors 263 corresponding to the position of the first limiting member 221 (which can serve as the initial mark). It should be noted that the markings for the initial mark, the 0 mark 24, and the end mark 25 in the exemplary embodiments of this disclosure can be wear-resistant markings etched or printed on the inner wall of the transparent test tube 23.

[0027] During the viscosity test, the test liquid is pumped by the pumping unit 20 and flows from the pumping unit to the third branch pipe 13. The test ball 21 is driven by the test liquid and accelerates freely from the initial scale to the 0 scale 24, reaching a uniform speed at the 0 scale 24. It then continues to move towards the final scale 25. Within the preset distance between the 0 scale 24 and the final scale 25, the resistance, buoyancy, and gravity acting on the test ball 21 reach equilibrium, allowing the test ball 21 to maintain a uniform speed. For example, the distance between the initial scale and the 0 scale 24 can be 15~30cm, and the preset distance between the 0 scale 24 and the final scale 25 can be 15~25cm. In this embodiment, non-contact sensors are respectively set on the outside of the transparent test tube 23 at the 0 mark 24 and the end mark 25. Without interfering with the movement of the test ball 21 or contaminating the test liquid, the time points when the test ball 21 reaches the 0 mark and the end mark can be accurately captured. The time taken for the test ball 21 to travel a preset distance can be detected, thereby determining the speed of the test ball 21 moving at a constant speed within the preset distance. This is more accurate than manual visual timing, thus ensuring the effectiveness and accuracy of the viscosity test of the test liquid.

[0028] In one exemplary embodiment, the control unit includes a controller connected to a pumping unit and a timing and position sensing unit. The controller is used to determine the drive frequency coefficient of the metering pump in the pumping unit based on the movement speed, and to determine the viscosity of the liquid to be tested based on the drive frequency coefficient.

[0029] After the timing and position sensing unit on the outside of the transparent test tube determines the speed of the test ball as it moves at a constant speed within a preset distance, the timing and position sensing unit transmits the signal to the controller. The controller then uses the formula V=(qf) / (πR) to... 2 Determine the driving frequency coefficient of the metering pump in the pumping unit, where V is the velocity of the test ball moving at a constant speed within a preset distance, in m / s, and q is the unidirectional displacement of the metering pump in the pumping unit, in m³ / s. 3 / rev, f is the driving frequency coefficient of the metering pump in the pumping unit, in Hz, and R is the diameter of the transparent test tube, in meters.

[0030] In this method, a falling ball method can be used with various standard liquids of known viscosity. The uniform velocity of the test ball is calculated based on the time required for the test ball to travel a preset distance, and a standard curve is established between viscosity μ and velocity V, i.e., a mapping relationship (μ, V) is established between viscosity μ and velocity V. The controller can determine the driving frequency coefficient f of the metering pump in the pumping unit based on formula V, thus establishing a mapping relationship (V, f) between velocity V and driving frequency coefficient f. Therefore, based on the mapping relationships (μ, V) and (V, f), a mapping relationship (f, μ) between driving frequency coefficient f and viscosity μ can be established. Therefore, during the viscosity test of the test liquid, the viscosity μ of the test liquid can be directly determined based on the driving frequency coefficient f. In the testing device of this embodiment, the viscosity μ of the test liquid can be directly determined based on the driving frequency coefficient f that enables the test ball to move uniformly within a preset distance, making the test simpler and faster, and suitable for online real-time monitoring of the test liquid.

[0031] In one exemplary embodiment, such as Figure 1 As shown, the testing device 100 also includes a temperature control unit 50, which is disposed between the pumping unit 30 and the testing unit 20. The temperature control unit 50 is used to control the temperature of the test liquid flowing through the testing unit 20. For example, the temperature control unit 50 may include a static mixer 501 and a heating jacket 502. The heating jacket 502 is filled with a constant temperature medium (such as heat transfer oil) to mix and heat the test liquid flowing through the testing unit 20, so that the test liquid is maintained at the set value of the test temperature. For example, it can be ±0.1℃, ±0.2℃, or ±0.3℃ of the set value of the test temperature, to avoid temperature changes in the test liquid after it enters the branch pipeline system 10 from the test liquid delivery pipe 40, which would affect the test results of the viscosity of the test liquid. The set value of the test temperature can be 30~80℃. The temperature control unit 50 may also include a temperature sensor 503 (such as Pt100) and a temperature controller 504. For example, when the temperature sensor detects that the temperature of the liquid to be tested exceeds the set value (or exceeds the error range of the set value), it transmits a signal to the temperature controller 504. The temperature controller 504 controls the static mixer 501 and the heating jacket 502 to work or stop working, adjusting the temperature of the liquid to be tested until the temperature sensor 503 detects that the temperature of the liquid to be tested has returned to the set value of the test temperature (or returned to the error range of the set value). The testing device 100 provided in this embodiment can eliminate the influence of temperature fluctuations on the test results during the viscosity test of the liquid to be tested, ensuring the reliability and comparability of the test results.

[0032] In one exemplary embodiment, the limiting member includes a hollow bracket, the diameter of which is smaller than the diameter of the test ball.

[0033] In this embodiment, as Figure 1 As shown, a perforated bracket is used as a limiting element, specifically serving as a first limiting element 221 located at the bottom of the transparent test tube 23 and a second limiting element 222 located at the top of the transparent test tube 23. Furthermore, the aperture of the perforated bracket is set smaller than the diameter of the test ball 21, which restricts the movement range of the test ball 21 within the transparent test tube 23, preventing the test ball 21 from being washed away or entering the test liquid delivery pipe 40. In addition, the perforated structure of the perforated bracket allows the test liquid to pass through the transparent test tube 23, thereby enabling viscosity testing of the test liquid.

[0034] In one exemplary embodiment, such as Figure 1 As shown, the testing device 100 may further include a pump inlet valve 31 for controlling whether the test liquid in the test liquid delivery pipeline 40 flows to the branch pipeline system 10. For example, the pump inlet valve 31 can be opened and closed at regular intervals according to the testing frequency of the test liquid viscosity. When the test liquid viscosity needs to be tested, the pump inlet valve 31 is opened, allowing the test liquid in the test liquid delivery pipeline 40 to flow to the branch pipeline system 10. When the test liquid viscosity does not need to be tested, the pump inlet valve 31 is closed.

[0035] An exemplary embodiment of this disclosure provides a viscosity testing method applied to a viscosity testing apparatus as described above. Figures 1 to 2 As shown, the test method includes: S100, the control pumping unit pumps the test liquid in the test liquid delivery pipeline to the branch pipeline system, and makes the test ball move at a constant speed within a preset distance in the transparent test tube.

[0036] The viscosity testing method provided in this embodiment is based on the classic falling ball method. The traditional falling ball method relies on gravity to drop a small ball to test the viscosity of the test liquid. For high-viscosity test liquids, the falling speed of the ball is slow, resulting in a long testing time. For low-viscosity test liquids, a longer pipeline is required to ensure the ball moves at a constant speed for viscosity testing. In step S100 of this embodiment, the pumping unit pumps the test liquid from the test liquid delivery pipeline to the branch pipeline system and actively controls the flow rate of the test liquid in the branch pipeline system 10. This allows the test ball 21 to move at a constant speed within a preset distance, thereby achieving the viscosity test of the test liquid.

[0037] S200: The control unit determines the viscosity of the liquid to be tested based on the speed at which the test ball moves at a constant speed within a preset distance.

[0038] In this step, the control unit determines the viscosity of the liquid to be tested based on the speed of the test ball 21 moving at a constant speed within a preset distance, thereby realizing the automated testing of the viscosity of the liquid to be tested, reducing errors from manual operation, improving testing efficiency and accuracy, and making it suitable for online real-time monitoring.

[0039] The viscosity testing method provided in this embodiment is directly based on the classical falling ball method physical law to test the viscosity of the test liquid. The test result is an absolute dynamic viscosity, which is independent of the material composition and flow rate of the test liquid and does not rely on empirical formulas. The test results are highly comparable. This testing method can realize the automated testing of the viscosity of the test liquid, reduce the error of manual operation, improve the testing efficiency and accuracy, and is suitable for online real-time monitoring.

[0040] In one exemplary embodiment, such as Figure 3 As shown, in step S200, the control unit determines the viscosity of the test liquid based on the speed of the test ball moving at a constant speed within a preset distance, including: S210. Determine the driving frequency coefficient of the metering pump in the pumping unit by measuring the speed of motion.

[0041] In this step, the time taken for the test ball to travel a preset distance can be detected first by the timing and position sensing unit, and the speed of the test ball moving at a constant speed within the preset distance can be determined. The control unit then uses the formula V=(qf) / (πR) 2 Determine the driving frequency coefficient of the metering pump in the pumping unit, where V is the velocity of the test ball moving at a constant speed within a preset distance, in m / s, and q is the unidirectional displacement of the metering pump in the pumping unit, in m³ / s. 3 / rev, f is the driving frequency coefficient of the metering pump in the pumping unit, in Hz, and R is the diameter of the transparent test tube, in meters.

[0042] S220. Determine the viscosity of the test liquid based on the mapping relationship between viscosity and driving frequency coefficient.

[0043] If the driving frequency coefficient of the metering pump in the pumping unit is determined in step S210, then in step S220, the viscosity of the test liquid can be determined based on the driving frequency coefficient of the metering pump and the mapping relationship between viscosity and driving frequency coefficient, making the test simpler and faster, and suitable for online real-time monitoring of the test liquid.

[0044] In one exemplary embodiment, such as Figure 4 As shown, the viscosity testing method also includes: S300: Obtain the sample velocity of the test ball moving at a constant speed within a preset distance.

[0045] In this step, the time taken for the test ball to travel a preset distance is detected by a timing and position sensing unit. The length of the preset distance can be determined based on the position of the 0 mark and the position of the 25 mark at the end point. The ratio of the length of the preset distance to the time taken for the test ball to travel the preset distance can be determined as the velocity of the test ball moving at a constant speed within the preset distance. The sample velocity can have multiple values; that is, the velocity of the test ball moving at a constant speed within the preset distance can be acquired multiple times, such as 3 times, 5 times, or 10 times, and each acquired velocity is used as a sample velocity.

[0046] S400. Determine the corresponding sample driving frequency coefficient based on the sample velocity.

[0047] Based on the sample velocity and the formula V=(qf) / (πR) 2 This allows us to determine the sample drive frequency coefficient corresponding to each sample velocity, where V is the velocity of the test ball moving at a constant speed within a preset distance, in m / s, and q is the unidirectional displacement of the metering pump in the pumping unit, in m³ / s. 3 / rev, f is the driving frequency coefficient of the metering pump in the pumping unit, in Hz, and R is the diameter of the transparent test tube, in meters.

[0048] S500: Based on the sample velocity and the sample driving frequency coefficient, establish a mapping relationship between viscosity and driving frequency coefficient.

[0049] Based on the sample velocity and the sample driving frequency coefficient, a mapping relationship (V, f) between the motion velocity V and the driving frequency coefficient f can be established. Furthermore, using the falling ball method with various standard liquids of known viscosity, the uniform motion velocity of the test ball can be calculated based on the time required for the test ball to travel a preset distance, and a standard curve between viscosity μ and motion velocity V can be established, i.e., a mapping relationship (μ, V) between viscosity μ and motion velocity V can be established. Therefore, based on the mapping relationships (μ, V) and (V, f), a mapping relationship (f, μ) between the driving frequency coefficient f and viscosity μ can be established. Thus, during the viscosity testing of the test liquid, the viscosity μ of the test liquid can be directly determined based on the driving frequency coefficient f.

[0050] The testing method provided in this embodiment establishes a mapping relationship between viscosity μ and driving frequency coefficient f. The viscosity μ of the test liquid can be directly determined based on the driving frequency coefficient f that enables the test ball to move at a constant speed within a preset distance, making the test simpler and faster, and suitable for online real-time monitoring of the test liquid.

[0051] In one exemplary embodiment, the testing method further includes: verifying the accuracy of the determined viscosity of the test liquid based on the motion speed of the test ball and a standard curve.

[0052] In this embodiment, the driving frequency coefficient f of the metering pump can be determined based on the velocity V of the test ball. The viscosity μ of the test liquid can be determined based on the driving frequency coefficient f and the mapping relationship (f, μ) between f and viscosity μ. Furthermore, the standard viscosity μ can be determined based on the standard curve of the test ball's velocity V versus viscosity and velocity. 标 Compare the viscosity μ of the test liquid with the standard viscosity μ. 标 The accuracy of the determined viscosity of the test liquid is verified by checking whether there is any deviation between the viscosity and the standard viscosity μ. During the viscosity test, the accuracy of the determined viscosity can be verified at fixed intervals using the method described above. For example, the accuracy can be verified at fixed time intervals or at fixed intervals of measurement. If the viscosity μ of the test liquid deviates from the standard viscosity μ... 标 If there is a deviation or the deviation is too large, an alarm can be issued to prompt the user to check the testing device.

[0053] In one exemplary embodiment, the testing method further includes: using a ball-dropping method, employing a variety of standard liquids with known viscosities, calculating the speed of the test ball based on the time required for the test ball to travel a preset distance, and establishing a standard curve of viscosity and speed.

[0054] In this embodiment, under constant temperature conditions (the temperature of which is the same as the constant temperature for the viscosity test of the liquid to be tested), the falling ball method is used, employing multiple standard liquids of known viscosity, such as 3 to 12 standard liquids of known viscosity. The speed of the test ball is calculated based on the time required for the test ball to travel a preset distance, and a standard curve of viscosity and speed is established, i.e., a mapping relationship between viscosity and speed is established, to verify the accuracy of the determined viscosity of the liquid to be tested and ensure the reliability of the viscosity test results.

[0055] To more clearly explain the technical solutions provided by the exemplary embodiments of this disclosure, reference is made to... Figure 1 The viscosity testing apparatus shown is illustrated below, and a specific example of the viscosity testing method provided in this disclosure is given below.

[0056] Example 1: At a constant temperature Ts=45℃, various known viscosities μ were used by the falling ball method. 标 The standard solution, based on the time t taken for a standard test ball (identical to test ball 21) to travel a distance of 25 cm. 标 Calculated linear velocity V 标 , formulate (μ 标 V 标 Standard curve, such as Figure 5As shown, the standard curve is stored in the control unit. The pump inlet valve 31 is opened, and the pumping unit 20 is started, driving the polyacrylonitrile stock solution (known viscosity 100.5s) in the test liquid delivery pipeline 40 to be delivered to the branch pipeline system 10. Simultaneously, the static mixer 501, the heating jacket 502, the temperature sensor 503, and the temperature controller 504 are started to heat the polyacrylonitrile stock solution in the branch pipeline system 10, stabilizing the temperature of the polyacrylonitrile stock solution at T=45℃. Polyacrylonitrile stock solution continuously flows through transparent test tube 23. Test ball 21 undergoes free acceleration under the influence of gravity, buoyancy, and resistance within the initial scale to 0 scale 24 of the transparent test tube 23. When test ball 21 reaches 0 scale 24, the gravity, buoyancy, and resistance it experiences reach equilibrium, and test ball 21 enters a state of uniform motion. The time t for test ball 21 to move from 0 scale 24 to the end scale 25 is recorded by the first set of non-contact sensors 261 at 0 scale 24 and the second set of non-contact sensors 262 at the corresponding end scale 25. Based on the preset distance between 0 scale 24 and the end scale 25, the velocity V of test ball 21 is calculated. The control unit adjusts the driving frequency coefficient f of the metering pump based on V, which enables test ball 21 to pass through the end scale 25 at a uniform speed, and establishes a mapping relationship (V, f) between the motion velocity V and the driving frequency coefficient f. The control unit then queries a pre-stored standard curve (μ) based on the calculated velocity V. 标 V 标 ), based on (V, f) and (μ) 标 V 标 The (f, μ) relationship was obtained. When f = 0.312, the viscosity of the polyacrylonitrile stock solution detected online was μ = 100.4 s, verifying the high accuracy of the online detection results.

[0057] Example 2: At a constant temperature Ts=45℃, various known viscosities μ were used by the falling ball method. 标 The standard solution, based on the time t taken for a standard test ball (identical to test ball 21) to travel a distance of 25 cm. 标 Calculated linear velocity V 标 , formulate (μ 标 V 标The standard curve is generated and stored in the control unit. The inlet valve 31 is opened to start the metering pump, driving the polyacrylonitrile stock solution (known viscosity 110.5s) in the test liquid delivery pipeline 40 to be delivered to the branch pipeline system 10. Simultaneously, the static mixer 501, the heating jacket 502, the temperature sensor 503, and the temperature controller 504 are activated to heat the polyacrylonitrile stock solution in the branch pipeline system 10, stabilizing its temperature at T=45℃. Polyacrylonitrile stock solution continuously flows through transparent test tube 23. Test ball 21 undergoes free acceleration under the influence of gravity, buoyancy, and resistance within the initial scale to 0 scale 24 of the transparent test tube 23. When test ball 21 reaches 0 scale 24, the gravity, buoyancy, and resistance it experiences reach equilibrium, and test ball 21 enters a state of uniform motion. The time t for test ball 21 to move from 0 scale 24 to the end scale 25 is recorded by the first set of non-contact sensors 261 at 0 scale 24 and the second set of non-contact sensors 262 at the corresponding end scale 25. Based on the preset distance between 0 scale 24 and the end scale 25, the velocity V of test ball 21 is calculated. The control unit adjusts the driving frequency coefficient f of the metering pump based on V, which enables test ball 21 to pass through the end scale 25 at a uniform speed, and establishes a mapping relationship (V, f) between the motion velocity V and the driving frequency coefficient f. The control unit then queries a pre-stored standard curve (μ) based on the calculated velocity V. 标 V 标 ), based on (V, f) and (μ) 标 V 标 The (f, μ) relationship was obtained. When f = 0.284, the viscosity of the polyacrylonitrile stock solution detected online was μ = 110.4 s, verifying the high accuracy of the online detection results.

[0058] Example 3: At a constant temperature Ts = 80℃, various known viscosities μ were used by the falling ball method. 标 The standard solution, based on the time t taken for a standard test ball (identical to test ball 21) to travel a distance of 25 cm. 标 Calculated linear velocity V 标 , formulate (μ 标 V 标 Standard curve, such as Figure 6As shown, the standard curve is stored in the control unit. The pump inlet valve 31 is opened, and the pumping unit 20 is started, driving the polyacrylonitrile stock solution (known viscosity 105.0s) in the test liquid delivery pipeline 40 to be delivered to the branch pipeline system 10. Simultaneously, the static mixer 501, the heating jacket 502, the temperature sensor 503, and the temperature controller 504 are started to heat the polyacrylonitrile stock solution in the branch pipeline system 10, stabilizing the temperature of the polyacrylonitrile stock solution at T=80℃. Polyacrylonitrile stock solution continuously flows through transparent test tube 23. Test ball 21 undergoes free acceleration under the influence of gravity, buoyancy, and resistance within the initial scale to 0 scale 24 of the transparent test tube 23. When test ball 21 reaches 0 scale 24, the gravity, buoyancy, and resistance it experiences reach equilibrium, and test ball 21 enters a state of uniform motion. The time t for test ball 21 to move from 0 scale 24 to the end scale 25 is recorded by the first set of non-contact sensors 261 at 0 scale 24 and the second set of non-contact sensors 262 at the corresponding end scale 25. Based on the preset distance between 0 scale 24 and the end scale 25, the velocity V of test ball 21 is calculated. The control unit adjusts the driving frequency coefficient f of the metering pump based on V, which enables test ball 21 to pass through the end scale 25 at a uniform speed, and establishes a mapping relationship (V, f) between the motion velocity V and the driving frequency coefficient f. The control unit then queries a pre-stored standard curve (μ) based on the calculated velocity V. 标 V 标 ), based on (V, f) and (μ) 标 V 标 The (f, μ) relationship was obtained. When f = 0.300, the viscosity of the polyacrylonitrile stock solution detected online was μ = 104.9 s, verifying the high accuracy of the online detection results.

[0059] Example 4: At a constant temperature Ts = 80℃, various known viscosities μ were used by the falling ball method. 标 The standard solution, based on the time t taken for a standard test ball (identical to test ball 21) to travel a distance of 25 cm. 标 Calculated linear velocity V 标 , formulate (μ 标 V 标The standard curve is generated and stored in the control unit. The pump inlet valve 31 is opened, and the pumping unit 20 is started, driving the polyacrylonitrile stock solution (known viscosity 120.0s) in the test liquid delivery pipeline 40 to be delivered to the branch pipeline system 10. Simultaneously, the static mixer 501, the heating jacket 502, the temperature sensor 503, and the temperature controller 504 are started to heat the polyacrylonitrile stock solution in the branch pipeline system 10, stabilizing the temperature of the polyacrylonitrile stock solution at T=80℃. Polyacrylonitrile stock solution continuously flows through transparent test tube 23. Test ball 21 undergoes free acceleration under the influence of gravity, buoyancy, and resistance within the initial scale to 0 scale 24 of the transparent test tube 23. When test ball 21 reaches 0 scale 24, the gravity, buoyancy, and resistance it experiences reach equilibrium, and test ball 21 enters a state of uniform motion. The time t for test ball 21 to move from 0 scale 24 to the end scale 25 is recorded by the first set of non-contact sensors 261 at 0 scale 24 and the second set of non-contact sensors 262 at the corresponding end scale 25. Based on the preset distance between 0 scale 24 and the end scale 25, the velocity V of test ball 21 is calculated. The control unit adjusts the driving frequency coefficient f of the metering pump based on V, which enables test ball 21 to pass through the end scale 25 at a uniform speed, and establishes a mapping relationship (V, f) between the motion velocity V and the driving frequency coefficient f. The control unit then queries a pre-stored standard curve (μ) based on the calculated velocity V. 标 V 标 ), based on (V, f) and (μ) 标 V 标 The (f, μ) relationship was obtained. When f = 0.262, the viscosity of the polyacrylonitrile stock solution detected online was μ = 120.2 s, verifying the high accuracy of the online detection results.

[0060] Example 5: At a constant temperature Ts = 80℃, various known viscosities μ were used by the falling ball method. 标 The standard solution, based on the time t taken for a standard test ball (identical to test ball 21) to travel a distance of 25 cm. 标 Calculated linear velocity V 标 , formulate (μ 标 V 标The standard curve is generated and stored in the control unit. The pump inlet valve 31 is opened, and the pumping unit 20 is started, driving the polyacrylonitrile stock solution (known viscosity 115.0s) in the test liquid delivery pipeline 40 to be delivered to the branch pipeline system 10. Simultaneously, the static mixer 501, the heating jacket 502, the temperature sensor 503, and the temperature controller 504 are started to heat the polyacrylonitrile stock solution in the branch pipeline system 10, stabilizing the temperature of the polyacrylonitrile stock solution at T=80℃. Polyacrylonitrile stock solution continuously flows through transparent test tube 23. Test ball 21 undergoes free acceleration under the influence of gravity, buoyancy, and resistance within the initial scale to 0 scale 24 of the transparent test tube 23. When test ball 21 reaches 0 scale 24, the gravity, buoyancy, and resistance it experiences reach equilibrium, and test ball 21 enters a state of uniform motion. The time t for test ball 21 to move from 0 scale 24 to the end scale 25 is recorded by the first set of non-contact sensors 261 at 0 scale 24 and the second set of non-contact sensors 262 at the corresponding end scale 25. Based on the preset distance between 0 scale 24 and the end scale 25, the velocity V of test ball 21 is calculated. The control unit adjusts the driving frequency coefficient f of the metering pump based on V, which enables test ball 21 to pass through the end scale 25 at a uniform speed, and establishes a mapping relationship (V, f) between the motion velocity V and the driving frequency coefficient f. The control unit then queries a pre-stored standard curve (μ) based on the calculated velocity V. 标 V 标 ), based on (V, f) and (μ) 标 V 标 The (f, μ) relationship was obtained. When f = 0.292, the viscosity of the polyacrylonitrile stock solution detected online was μ = 115.1 s, verifying the high accuracy of the online detection results.

[0061] Example 6: At a constant temperature Ts = 80℃, various known viscosities μ were used by the falling ball method. 标 The standard solution, based on the time t taken for a standard test ball (identical to test ball 21) to travel a distance of 15 cm, was used. 标 Calculated linear velocity V 标 , formulate (μ 标 V 标The standard curve is generated and stored in the control unit. The pump inlet valve 31 is opened, and the pumping unit 20 is started, driving the polyacrylonitrile stock solution (known viscosity 115.0s) in the test liquid delivery pipeline 40 to be delivered to the branch pipeline system 10. Simultaneously, the static mixer 501, the heating jacket 502, the temperature sensor 503, and the temperature controller 504 are started to heat the polyacrylonitrile stock solution in the branch pipeline system 10, stabilizing the temperature of the polyacrylonitrile stock solution at T=80℃. Polyacrylonitrile stock solution continuously flows through transparent test tube 23. Test ball 21 undergoes free acceleration under the influence of gravity, buoyancy, and resistance within the initial scale to 0 scale 24 of the transparent test tube 23. When test ball 21 reaches 0 scale 24, the gravity, buoyancy, and resistance it experiences reach equilibrium, and test ball 21 enters a state of uniform motion. The time t for test ball 21 to move from 0 scale 24 to the end scale 25 is recorded by the first set of non-contact sensors 261 at 0 scale 24 and the second set of non-contact sensors 262 at the corresponding end scale 25. Based on the preset distance between 0 scale 24 and the end scale 25, the velocity V of test ball 21 is calculated. The control unit adjusts the driving frequency coefficient f of the metering pump based on V, which enables test ball 21 to pass through the end scale 25 at a uniform speed, and establishes a mapping relationship (V, f) between the motion velocity V and the driving frequency coefficient f. The control unit then queries a pre-stored standard curve (μ) based on the calculated velocity V. 标 V 标 ), based on (V, f) and (μ) 标 V 标 The (f, μ) relationship was obtained. When f = 0.292, the viscosity of the polyacrylonitrile stock solution detected online was μ = 114.9 s, verifying the high accuracy of the online detection results.

[0062] Comparative Example 1: At a constant temperature Ts=45℃, various known viscosities μ were used by the falling ball method. 标 The standard solution, based on the time t taken for a standard test ball (identical to test ball 21) to travel a distance of 25 cm. 标 Calculated linear velocity V 标 , formulate (μ 标 V 标The standard curve is generated and stored in the control unit. The pump inlet valve 31 is opened, and the pumping unit 20 is started, driving the polyacrylonitrile stock solution (known viscosity 100.5s) in the test liquid delivery pipeline 40 to be delivered to the branch pipeline system 10. Simultaneously, the static mixer 501, the heating jacket 502, the temperature sensor 503, and the temperature controller 504 are started to heat the polyacrylonitrile stock solution in the branch pipeline system 10, stabilizing the temperature of the polyacrylonitrile stock solution at T=30℃. Polyacrylonitrile stock solution continuously flows through transparent test tube 23. Test ball 21 undergoes free acceleration under the influence of gravity, buoyancy, and resistance within the initial scale to 0 scale 24 of the transparent test tube 23. When test ball 21 reaches 0 scale 24, the gravity, buoyancy, and resistance it experiences reach equilibrium, and test ball 21 enters a state of uniform motion. The time t for test ball 21 to move from 0 scale 24 to the end scale 25 is recorded by the first set of non-contact sensors 261 at 0 scale 24 and the second set of non-contact sensors 262 at the corresponding end scale 25. Based on the preset distance between 0 scale 24 and the end scale 25, the velocity V of test ball 21 is calculated. The control unit adjusts the driving frequency coefficient f of the metering pump based on V, which enables test ball 21 to pass through the end scale 25 at a uniform speed, and establishes a mapping relationship (V, f) between the motion velocity V and the driving frequency coefficient f. The control unit then queries a pre-stored standard curve (μ) based on the calculated velocity V. 标 V 标 ), based on (V, f) and (μ) 标 V 标 The (f, μ) relationship was obtained. When f = 0.390, the viscosity μ of the polyacrylonitrile stock solution detected online was 80.3s, verifying the low accuracy of the online detection results.

[0063] Comparative Example 2: At a constant temperature Ts=45℃, various known viscosities μ were used by the falling ball method. 标 The standard solution, based on the time t taken for a standard test ball (identical to test ball 21) to travel a distance of 25 cm. 标 Calculated linear velocity V 标 , formulate (μ 标 V 标A standard curve is generated and stored in the control unit. The pump inlet valve 31 is opened, and the pumping unit 20 is started, driving the polyacrylonitrile stock solution (known viscosity 110.5s) in the test liquid delivery pipeline 40 to be delivered to the branch pipeline system 10. Simultaneously, the static mixer 501, heating jacket 502, temperature sensor 503, and temperature controller 504 are started to heat the polyacrylonitrile stock solution in the branch pipeline system 10, stabilizing its temperature at T=45℃. The polyacrylonitrile stock solution continuously flows through the transparent test tube 23. The test ball 21 moves freely and accelerates within the transparent test tube 23. The first set of non-contact sensors 261 at the 0 mark 24 and the second set of non-contact sensors 262 at the corresponding endpoint mark 25 record the time t for each segment of the test ball 21's movement from the 0 mark 24 to the endpoint mark 25. It is determined that the test ball 21 has not entered a uniform velocity state, therefore the accurate viscosity μ of the polyacrylonitrile stock solution cannot be obtained.

[0064] Comparative Example 3: At a constant temperature Ts = 80℃, various known viscosities μ were used by the falling ball method. 标 The standard solution is used to measure the time t taken for a standard test ball (of the same volume as the stainless steel test ball 21) to travel a distance of 25 cm. 标 Calculated linear velocity V 标 , formulate (μ 标 V 标 The standard curve is generated and stored in the control unit. The pump inlet valve 31 is opened, and the pumping unit 20 is started, driving the polyacrylonitrile stock solution (known viscosity 105.0s) in the test liquid delivery pipeline 40 to be delivered to the branch pipeline system 10. Simultaneously, the static mixer 501, the heating jacket 502, the temperature sensor 503, and the temperature controller 504 are started to heat the polyacrylonitrile stock solution in the branch pipeline system 10, stabilizing the temperature of the polyacrylonitrile stock solution at T=80℃. Polyacrylonitrile stock solution continuously flows through transparent test tube 23. Test ball 21 undergoes free acceleration under the influence of gravity, buoyancy, and resistance within the initial scale to 0 scale 24 of the transparent test tube 23. When test ball 21 reaches 0 scale 24, the gravity, buoyancy, and resistance it experiences reach equilibrium, and test ball 21 enters a state of uniform motion. The time t for test ball 21 to move from 0 scale 24 to the end scale 25 is recorded by the first set of non-contact sensors 261 at 0 scale 24 and the second set of non-contact sensors 262 at the corresponding end scale 25. Based on the preset distance between 0 scale 24 and the end scale 25, the velocity V of test ball 21 is calculated. The control unit adjusts the driving frequency coefficient f of the metering pump based on V, which enables test ball 21 to pass through the end scale 25 at a uniform speed, and establishes a mapping relationship (V, f) between the motion velocity V and the driving frequency coefficient f. The control unit then queries a pre-stored standard curve (μ) based on the calculated velocity V. 标V 标 ), based on (V, f) and (μ) 标 V 标 The (f, μ) relationship was obtained. When f = 0.240, the viscosity of the polyacrylonitrile stock solution detected online was μ = 130.1s, verifying the high accuracy of the online detection results.

[0065] Table 1 below lists the other test parameters for Examples 1-6 and Comparative Examples 1-3: Table 1

[0066] As can be seen from Examples 1-6, Comparative Examples 1-3, and the data in Table 1 above, this disclosure establishes (μ 标 V 标 When setting the standard curve and conducting viscosity tests on the test liquid, strict control of parameter consistency is essential to ensure high accuracy of online viscosity detection results. Furthermore, the viscosity testing method provided in this disclosure enables automated testing of the test liquid's viscosity, reducing human error, improving testing efficiency and accuracy, and making it suitable for online real-time monitoring.

[0067] The above-described contents can be implemented individually or in various combinations, and all such variations are within the scope of this disclosure.

[0068] Finally, it should be noted that in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0069] The above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A viscosity testing device, characterized in that, The testing apparatus includes: A branch pipeline system, comprising a first branch pipeline, a second branch pipeline, and a third branch pipeline connected in sequence; the first branch pipeline and the third branch pipeline are respectively connected to a test liquid delivery pipeline, and the first branch pipeline and the third branch pipeline are respectively perpendicular to the test liquid delivery pipeline; The testing unit includes a test ball and a limiting component. The third branch pipeline includes a transparent test tube. The test ball is disposed inside the transparent test tube. The limiting component is disposed at both ends inside the transparent test tube to prevent the test ball from detaching from the transparent test tube. The transparent test tube is provided with a 0 mark and an end mark. The distance between the 0 mark and the end mark is a preset distance. A pumping unit is provided in the second branch pipeline. The pumping unit is used to pump the test liquid in the test liquid delivery pipeline to the branch pipeline system and make the test ball move at a constant speed within the preset distance. A control unit is used to determine the viscosity of the test liquid based on the speed at which the test ball moves at a constant speed within a preset distance.

2. The viscosity testing device according to claim 1, characterized in that, The testing device further includes a timing and position sensing unit, which includes at least two sets of non-contact sensors. The non-contact sensors are disposed on the outside of the transparent testing tube and correspond to the 0 mark and the endpoint mark. The timing and position sensing unit is used to detect the time taken for the test ball to travel the preset distance and to determine the speed of the test ball moving at a constant speed within the preset distance.

3. The viscosity testing device according to claim 2, characterized in that, The control unit includes a controller connected to the pumping unit and the timing and position sensing unit; the controller is used to determine the driving frequency coefficient of the metering pump in the pumping unit according to the movement speed, and to determine the viscosity of the liquid to be tested according to the driving frequency coefficient.

4. The viscosity testing device according to claim 1, characterized in that, The testing device also includes a temperature control unit, which is disposed between the pumping unit and the testing unit. The temperature control unit is used to control the temperature of the test liquid flowing through the testing unit.

5. The viscosity testing device according to claim 1, characterized in that, The limiting component includes a hollow bracket, the diameter of which is smaller than the diameter of the test ball.

6. A viscosity testing method, characterized in that, The test method is applied to the viscosity testing apparatus as described in any one of claims 1 to 5, and the test method includes: The control pumping unit pumps the test liquid in the test liquid delivery pipeline to the branch pipeline system, and makes the test ball move at a constant speed within a preset distance in the transparent test tube. The control unit determines the viscosity of the test liquid based on the speed at which the test ball moves at a constant speed within the preset distance.

7. The viscosity testing method according to claim 6, characterized in that, The control unit determines the viscosity of the test liquid based on the speed at which the test ball moves at a constant speed within the preset distance, including: The driving frequency coefficient of the metering pump in the pumping unit is determined by the movement speed. The viscosity of the test liquid is determined based on the mapping relationship between viscosity and driving frequency coefficient.

8. The viscosity testing method according to claim 7, characterized in that, The testing method also includes: Obtain the sample velocity of the test ball moving at a constant speed within the preset distance; Based on the sample velocity, determine the corresponding sample driving frequency coefficient; A mapping relationship between the viscosity and the driving frequency coefficient is established based on the sample velocity and the sample driving frequency coefficient.

9. The viscosity testing method according to claim 7, characterized in that, The testing method also includes: The accuracy of the determined viscosity of the test liquid is verified by comparing the motion speed of the test ball with the standard curve.

10. The viscosity testing method according to claim 9, characterized in that, The testing method also includes: Using the ball-dropping method, a variety of standard solutions with known viscosities are used to calculate the speed of the test ball based on the time required for the test ball to travel the preset distance, and a standard curve of the viscosity and the speed of movement is established.

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