Flow type liquid viscosity measuring device and measuring method

Abstract

The invention discloses a flowing type liquid viscosity measuring device and a measuring method. The measuring device comprises a cup body, an inner container, a weighing sensor, a liquid level sensor and a measuring circuit, the section of the inner container is in a cylinder or inverted frustum shape, the inner container is coaxially installed in the cup body, outflow holes are formed in the bottom of the cup body and the bottom of the inner container, and the inner container outflow hole is located in the upper portion of the cup body outflow hole. The weighing sensor is installed at the bottom of the cup body, and the inner container is installed on the weighing sensor directly or through a tray. The weighing sensor and the liquid level sensor are both electrically connected with the measuring circuit, the weighing sensor measures the mass of the liquid to be measured in the inner container in real time, and the measured value is recorded through the measuring circuit. The device and the method have the effects of realizing on-line measurement of the low-shear kinematic viscosity and density of the liquid, and being fast in response, high in precision and high in reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial automation, and particularly relates to a flow-type liquid viscosity measuring device and a measuring method. Background Art

[0002] In industrial automation applications, online viscosity sensors are widely used to measure real-time parameters of fluids, such as lubricating oil condition monitoring, lithium-ion battery slurry, and chemical product production. Currently, online viscosity measurement mainly adopts vibration or torsional vibration measurement techniques to measure the dynamic viscosity of liquids under high shear. The kinematic viscosity of liquids under low shear is usually measured by capillary tubes in the laboratory and by viscosity cups in the field. However, for the flow-type viscosity measurement using a viscosity cup, there are two problems: Firstly, the current operation mode is manual, which has high requirements for operation skills, long measurement time, and low accuracy, and is currently mainly used for on-site sampling screening detection; Secondly, although the industry has tried to improve the automation of flow-type viscosity measurement, there are generally problems such as complex structure, low accuracy, and long measurement response time, making it difficult to be applied in actual online measurement. Summary of the Invention

[0003] In order to solve one or more of the above problems, the present invention provides a flow-type liquid viscosity measuring device and a measuring method.

[0004] According to one aspect of the present invention, a flow-type liquid viscosity measuring device includes: a cup body, an inner container, a weighing sensor, and a measuring circuit;

[0005] The cross-section of the inner container is in the shape of a cylinder or an inverted frustum, and it is coaxially installed inside the cup body. The bottom of both the cup body and the inner container is provided with an outflow hole, and the outflow hole of the inner container is located above the outflow hole of the cup body;

[0006] The weighing sensor is installed at the bottom of the cup body, and the inner container is directly or installed on the weighing sensor through a tray; the weighing sensor is electrically connected to the measuring circuit, and the weighing sensor measures the mass of the liquid to be measured in the inner container in real time and records the measured value through the measuring circuit.

[0007] In some embodiments, it further includes a liquid level sensor and a temperature sensor, both of which are electrically connected to the measuring circuit. The liquid level sensor and the temperature sensor are both installed on the bottom surface of the inner container. The liquid level sensor includes electrode columns, and a capacitance sensor is formed between the two electrode columns or between the electrode column and the inner container wall to measure the liquid level height of the liquid to be measured in the inner container in real time;

[0008] Or the weighing sensor is a parallel beam weighing sensor or an annular force sensor;

[0009] Or the electrode column is a stainless steel column body coated with a polymer film.

[0010] In some embodiments, a liquid accumulation cup is provided below the cup body, and the liquid accumulation cup is movably connected to the cup body.

[0011] In some embodiments, a diversion tube is provided on the outflow hole of the inner liner. The length of the diversion tube is adapted to the viscosity range of the liquid to be measured. A diversion ring with a trapezoidal cross-section is provided at the top of the cup body, and the diversion ring is used to gather the liquid to be measured into the inner liner.

[0012] In some embodiments, the inner liner is a standard viscosity measuring cup, which is movably installed on a cylindrical tray;

[0013] An outflow hole is provided at the bottom of the cylindrical tray and coincides with the axes of the outflow hole of the inner liner and the outflow hole of the cup body;

[0014] A handle is provided on the outer side of the cup body, and a measurement start button is provided on the handle.

[0015] In some embodiments, it further includes: a top cover, a liquid inlet pipe, a liquid outlet pipe, a bypass pipe, a three-way valve, and a liquid pump; wherein the liquid inlet pipe is installed on the top cover, the liquid outlet pipe is installed at the bottom of the cup body and is connected to the outflow hole of the cup body; the bypass pipe is installed between the liquid inlet pipe and the liquid outlet pipe, and a three-way valve is provided at the connection between the bypass pipe and the liquid inlet pipe.

[0016] In some embodiments, the liquid inlet pipe, the diversion tube, and the outflow hole of the cup body are arranged in sequence from top to bottom. The inner diameter of the liquid inlet pipe is larger than the diameter of the diversion tube. Both the three-way valve and the liquid pump are electrically connected to the measurement circuit.

[0017] The present invention also provides a method for measuring the viscosity of a flowing liquid, using the above-mentioned device for measuring the viscosity of a flowing liquid, including:

[0018] S1. The measuring device is installed in a pipeline for conveying the liquid to be measured, and the axis of the cup body is kept perpendicular to the ground;

[0019] S2. At the start of the measurement, the three-way valve closes the liquid inlet pipe, opens the bypass pipe, and the liquid pump is started. The original liquid to be measured flows out from the bypass pipe to update the liquid to be measured in the pipeline;

[0020] S3. After the measurement circuit times for a period of time t0, it controls the three-way valve to close the bypass pipe and open the liquid inlet pipe. The liquid to be measured quickly flows into the inner liner through the liquid inlet pipe, and the speed of the liquid flowing into the inner liner is much higher than the speed of flowing out through the outflow hole of the inner liner;

[0021] S4. The electrode column 31 measures the real-time height of the liquid to be measured, and the weighing sensor measures the real-time mass of the liquid to be measured. When the liquid height reaches the preset value h0, the liquid mass m0 is recorded, then the liquid inlet pipe is closed, the bypass pipe is opened, and the liquid pump stops working;

[0022] The density ρ of the liquid to be measured is calculated from m0, h0, and the cross-sectional area of the inner liner;

[0023] S5. The measuring circuit records in real time the mass of the liquid under test changing with time until the change in mass per unit time is less than m1, where m1 < 5 g;

[0024] S6. Calculate the absolute value k of the change rate of the mass of the liquid under test between a × m0 and b × m0, where: 1 > a > 0.3, 0.5 > a - b > 0;

[0025] S7. Calculate the value of k / ρ, and obtain the viscosity value of the liquid based on the calibration between k / ρ and the liquid viscosity.

[0026] The present invention also provides another method for measuring the viscosity of a flowing liquid, which is used to measure the viscosity of a liquid with little change in density. The measuring device is adopted, including:

[0027] S1. Hold the handle to keep the axis of the cup body perpendicular to the ground;

[0028] S2. Open the measurement start button, and the liquid under test quickly flows into the inner container until the height of the liquid in the inner container exceeds 2 / 3 of the height of the inner container;

[0029] S3. Keep the measuring device horizontal until all the liquid under test flows out of the inner container;

[0030] S4. The measuring circuit records in real time the mass of the liquid under test changing with time until the change in mass per unit time is less than m1, where m1 < 5 g;

[0031] S5. Calculate the absolute value k of the change rate of the mass of the liquid under test between a × M0 and b × M0, where M0 is the maximum mass value of the liquid under test in the inner container measured by the weighing sensor, 1 > a > 0.3, 0.5 > a - b > 0;

[0032] S6. The value of k is related to the viscosity of the liquid under test, and the viscosity value of the liquid can be obtained through calibration.

[0033] In some embodiments, the above two measuring methods further include a temperature measurement step for temperature compensation of the calculated viscosity or density value. Description of the Drawings

[0034] Figure 1 It is a schematic cross-sectional view of a portable fluid viscosity measuring device according to Embodiment 1 of the present invention;

[0035] Figure 2 is Figure 1 a schematic top view of the shown portable fluid viscosity measuring device;

[0036] Figure 3 It is a schematic diagram of a fluid viscosity measuring device with a conical table-shaped measuring cup according to Embodiment 2 of the present invention;

[0037] Figure 4 Schematic diagram of a fluid viscosity measurement device with a standard measuring cup according to the present invention;

[0038] Figure 5 Schematic diagram of an on-line measurement fluid viscosity and density measurement device according to Embodiment 3 of the present invention;

[0039] Cup body 10, cup body outflow hole 11, diversion tube 12, cylindrical tray 13, handle 14, measurement start button 15, liquid accumulation cup 16;

[0040] Inner liner 20, inner liner outflow hole 21, diversion ring 22, standard viscosity measuring cup 23;

[0041] Load cell 30, electrode post 31, temperature sensor 32, parallel beam load cell 33, annular force measuring sensor 34;

[0042] Measurement circuit 40;

[0043] Top cover 50, liquid inlet pipe 51, liquid outlet pipe 52, bypass pipe 53, three-way valve 54, liquid pump 55. Detailed implementation manners

[0044] The present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component respectively.

[0045] Figures 1 to 5 Schematically shows a flow-type liquid viscosity measurement device according to the present invention, which can be applied to industrial fluids such as lithium-ion battery slurries, paints and latexes at the production site, where the kinematic viscosity of industrial fluids needs to be frequently checked. The flow-type liquid viscosity measurement device directly replaces the existing viscosity measuring cup and timer manual inspection method, realizes the measurement of kinematic viscosity during the sampling process, and then takes down the liquid accumulation cup and sends it to the laboratory for comparison measurement and verification, which will greatly save on-site manpower and measurement time.

[0046] Embodiment 1

[0047] As Figure 1 shown, a flow-type liquid viscosity measurement device, which is presented as a portable automatic measuring cup, includes: a cup body 10, an inner liner 20, a load cell 30 and a measurement circuit 40;

[0048] Among them, the cross-section of the inner liner 20 is cylindrical. As Figure 1 shown in or 2, the inner liner 20 is coaxially installed inside the cup body 10. Outflow holes are provided at the bottoms of both the cup body 10 and the inner liner 20, and the inner liner outflow hole 21 is located above the cup body outflow hole 11;

[0049] The load cell 30 is installed at the bottom of the cup body 10, and the inner container 20 is directly or installed on the load cell 30 through a tray; the load cell 30 is electrically connected to the measurement circuit 40. The load cell 30 measures the mass of the liquid to be measured in the inner container 20 in real time and records the measured value through the measurement circuit 40. The load cell 30 is preferably a parallel beam load cell 33, a ring force sensor 34, etc.

[0050] Preferably, it further includes a liquid level sensor. The liquid level sensor is electrically connected to the measurement circuit 40. The liquid level sensor usually adopts an electrode post 31, and the electrode post 31 is installed on the bottom surface of the inner container 20. The electrode post 31 is preferably a stainless steel column coated with a polymer film on its surface. The liquid level sensor can be a single electrode post type liquid level sensor or a double electrode post type liquid level sensor. When a single electrode post type liquid level sensor is adopted, a capacitance sensor is formed between the electrode post 31 and the inner wall of the inner container 20, and thus the liquid level height of the liquid to be measured in the inner container 20 can be measured in real time; when a double electrode post type liquid level sensor is adopted, as Figure 2 shown, a capacitance sensor is formed between the two electrode posts 31, and thus the liquid level height of the liquid to be measured in the inner container 20 can be measured in real time. Of course, the specific type of the liquid level sensor is not limited to the electrode post structure, and other types of liquid level sensors can also be adopted.

[0051] This flow-type liquid viscosity measuring device adopts the method that the speed of the liquid to be measured flowing into the inner container is greater than the outflow speed, and simultaneously measures the mass change during the liquid inflow and outflow processes. By selecting the mass change slope at a special stage during the liquid outflow process, the kinematic viscosity of the liquid to be measured is obtained. Compared with the traditional method of blocking the outflow hole of the viscosity cup to measure the time for the liquid to be measured to flow out of the viscosity cup, its beneficial effects are as follows: First, this measuring device realizes the online measurement of the low-shear kinematic viscosity of the liquid, has a fast response time for viscosity measurement, and also improves the accuracy of viscosity measurement; Second, the viscosity measuring cup design integrated with a capacitance sensor can not only measure the viscosity of the liquid to be measured, but also measure the density of the liquid to be measured simultaneously, and can realize the simultaneous online measurement of the viscosity and density of the liquid to be measured; Third, and it has a simple structure, high reliability, and great practical value.

[0052] Preferably, as Figures 1 to 2 shown, it further includes a temperature sensor 32. The temperature sensor 32 is electrically connected to the measurement circuit 40. The temperature sensor 32 is installed on the bottom surface of the inner container 20 and is used to measure the temperature of the liquid to be measured in real time. Because the viscosity of the liquid is usually affected by temperature, therefore, the real-time measurement of the temperature of the liquid can be used for the compensation of the liquid viscosity.

[0053] Preferably, since the liquid to be measured flows into the inner container 20 and then flows out through the outflow hole 21 of the inner container and the outflow hole 11 of the cup body, in order to collect the outflow liquid, a liquid collecting cup 16 can be provided below the cup body 10. The liquid collecting cup 16 is movably connected to the cup body 10. Common movable connection methods can be threaded connection, snap connection, etc.

[0054] To further facilitate the diversion of the liquid to be measured, a diversion tube 12 is provided on the outflow hole 21 of the inner container. The diversion tube 12 extends into the outflow hole 11 of the cup body. The length of the diversion tube 12 is adapted to the viscosity range of the liquid to be measured. A diversion ring 22 with a trapezoidal cross-section is provided at the top of the cup body 10. The diversion ring 22 is used to gather the liquid to be measured into the inner container 20. The diversion ring 22 is usually detachably connected to the cup body 10, and the inner diameter of the small-diameter end of the diversion ring 22 is smaller than the inner diameter of the inlet of the inner container 20.

[0055] Preferably, as the inner container 20 of the measuring cup, a standard viscosity measuring cup 23 can be used, such as the Zahn cup, Ford cup, ISO viscosity cup, DIN viscosity cup, etc. commonly used in the industry. It is movably installed on the cylindrical tray 13. An outflow hole is provided at the bottom of the tray 13 and coincides with the axes of the outflow hole 21 of the inner container and the outflow hole 11 of the cup body; a handle 14 is provided on the outside of the cup body 10, and a measurement start button 15 is provided on the handle 14.

[0056] The flow-type liquid viscosity measuring device in Embodiment 1 is usually used to measure liquids with little change in density. The steps of measuring the liquid viscosity using the flow-type liquid viscosity measuring device are as follows:

[0057] S1. Hold the handle 14 to keep the axis of the cup body 10 perpendicular to the ground; among them, it is preferable to clean and dry the measuring cup before measurement.

[0058] S2. Turn on the measurement start button 15, and the liquid to be measured quickly flows into the inner container 20 until the height of the liquid in the inner container 20 exceeds 2 / 3 of the height of the inner container 20.

[0059] S3. Keep the measuring device horizontal until all the liquid to be measured flows out of the inner container 20.

[0060] S4. The measurement circuit 40 records the mass of the liquid to be measured changing with time in real time until the change amount of the mass per unit time is less than m1, where m1 < 5g.

[0061] S5. Calculate the absolute value k of the change rate of the mass of the liquid to be measured between a×M0 and b×M0, where M0 is the maximum mass value of the liquid to be measured in the inner container 20 measured by the weighing sensor 30, 1 > a > 0.3, and 0.5 > a - b > 0.

[0062] S6. The value of k is related to the viscosity of the liquid to be measured, and the viscosity value of the liquid can be obtained through calibration.

[0063] S7. Measure the temperature of the liquid to be measured for temperature compensation of the calculated viscosity or density value.

[0064] For step S5, since the value of k gradually decreases as the amount of liquid in the viscosity cup decreases, it is necessary to select the value of k under the same conditions to obtain the kinematic viscosity of the liquid, and the measurement will be relatively accurate. Therefore, according to a large number of experiments, the present invention defines this condition as the absolute value k of the change rate of the mass of the liquid to be measured between a×M0 and b×M0, where M0 is the maximum mass value of the liquid to be measured in the inner container measured by the weighing sensor, 1 > a > 0.3, and 0.5 > a - b > 0.

[0065] Currently, the method of measuring kinematic viscosity using a viscosity cup in the art is to measure the time for a certain volume of fluid to flow out through the small hole at the bottom of the cup, and then the kinematic viscosity of the liquid can be converted proportionally. This measurement method is cumbersome and time-consuming. The present invention uses the method of measuring the mass of the liquid flowing out per unit time, that is, the slope k of the mass change with time, to replace the above method of measuring the outflow time. For liquids with the same or similar density, this method is faster and more accurate because the force sensor has high precision in measuring mass changes and a fast response time.

[0066] Example 2

[0067] Different from Example 1, as Figure 3 shown, the cross-section of the inner container 20 is an inverted frustum of a cone, with its large-diameter end facing upward and its small-diameter end facing downward. Such a setting method is more conducive to measuring the flow of the liquid.

[0068] Example 3

[0069] Different from Example 1 and Example 2, the on-line measuring device further includes: a top cover 50, a liquid inlet pipe 51, a liquid outlet pipe 52, a bypass pipe 53, a three-way valve 54, and a liquid pump 55; wherein the liquid inlet pipe 51 is installed on the top cover 50, the liquid outlet pipe 52 is installed at the bottom of the cup body 10 and connected to the cup body outflow hole 11; the bypass pipe 53 is installed between the liquid inlet pipe 51 and the liquid outlet pipe 52, a three-way valve 54 is provided at the connection between the bypass pipe 54 and the liquid inlet pipe 51, the liquid inlet pipe 51, the diversion pipe 12, and the cup body outflow hole 11 are arranged in sequence from top to bottom, the inner diameter of the liquid inlet pipe 51 is larger than the inner diameter of the diversion pipe 12, both the three-way valve 53 and the liquid pump 55 are electrically connected to the measuring circuit 40, and the liquid inlet pipe 51 is used to connect to the pipeline for transporting the liquid to be measured. The beneficial effect is that this structure realizes the on-line measurement of kinematic viscosity and density, with a simple structure, high reliability, and high practicability.

[0070] The on-line measuring device of the present invention is usually used to measure liquids with different densities. The specific measurement method is as follows:

[0071] S1. The measuring device is installed in the pipeline for conveying the liquid to be measured, and the axis of the cup body 10 is kept perpendicular to the ground;

[0072] S2. At the start of measurement, the three-way valve 54 closes the liquid inlet pipe 51, opens the bypass pipe 53, the liquid pump 55 is started, and the original liquid to be measured flows out from the bypass pipe 53 to update the liquid to be measured in the pipeline;

[0073] S3. After the measuring circuit 40 times for a period of time t0, it controls the three-way valve 54 to close the bypass pipe 53, open the liquid inlet pipe 51, and the liquid to be measured quickly flows into the inner tank 20 through the liquid inlet pipe 51, and the flow rate of the liquid flowing into the inner tank 20 is much higher than the flow rate through the outflow hole 21 of the inner tank;

[0074] S4. The electrode column 31 measures the real-time height of the liquid to be measured, the weighing sensor 30 measures the real-time mass of the liquid to be measured. When the liquid height reaches the preset value h0, the liquid mass m0 is recorded, then the liquid inlet pipe 51 is closed, the bypass pipe 53 is opened, and the liquid pump 55 stops working;

[0075] The density ρ of the liquid to be measured is calculated from m0, h0 and the cross-sectional area of the inner tank 20;

[0076] S5. The measuring circuit 40 records the mass of the liquid to be measured changing with time in real time until the mass change per unit time is less than m1, where m1 < 5 g;

[0077] S6. Calculate the absolute value k of the change rate of the mass of the liquid to be measured between a×m0 and b×m0, where: 1 > a > 0.3, 0.5 > a - b > 0;

[0078] S7. Calculate the value of k / ρ, and obtain the viscosity value of the liquid based on the calibration between k / ρ and the liquid viscosity;

[0079] S8. Measure the temperature of the liquid to be measured for temperature compensation of the calculated viscosity or density value.

[0080] Among them, for step S6, since the value of k will gradually decrease as the amount of liquid in the viscosity cup decreases, it is necessary to select the value of k under the same conditions to obtain the kinematic viscosity of the liquid. According to a large number of experiments, the present invention sets this condition as: calculate the absolute value k of the change rate of the mass of the liquid to be measured between a*m0 and b*m0, where 1 > a > 0.3, 0.5 > a - b > 0.

[0081] For step S7, due to the different densities of the liquid to be measured, it is necessary to first measure the density ρ of the liquid, and then divide the mass change k per unit time by the density of the liquid to obtain the volume change k / ρ of the liquid per unit time. The volume change per unit time is inversely proportional to the outflow time of the liquid, so the kinematic viscosity of the liquid can be obtained. In the present invention, the liquid level sensor can measure the liquid level height h0 of the liquid, and multiplying it by the cross-sectional area of the viscosity cup can obtain the volume v0 of the liquid. Since the mass of the liquid is measured by the weighing sensor to obtain m0, the density ρ of the liquid can be calculated.

[0082] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A flow type liquid viscosity measuring device, characterized in that: It comprises: a cup body (10), an inner liner (20), a weighing sensor (30) and a measuring circuit (40); The inner container (20) has a cross-section in the shape of a cylinder or an inverted cone and is coaxially mounted inside the cup body (10). Outflow holes are provided at the bottom of the cup body (10) and the inner container (20), and the inner container outflow hole (21) is located above the cup body outflow hole (11). The weighing sensor (30) is mounted on the bottom of the cup body (10), and the inner liner (20) is mounted on the weighing sensor (30) directly or through a tray; the weighing sensor (30) is electrically connected to a measuring circuit (40), and the weighing sensor (30) measures the mass of the liquid to be measured in the inner liner (20) in real time, and records the measured value through the measuring circuit (40).

2. The flow type liquid viscosity measuring device according to claim 1, characterized in that: It also includes a liquid level sensor and a temperature sensor (32), both of which are electrically connected to the measurement circuit (40), the liquid level sensor and the temperature sensor (32) are both installed on the bottom surface of the inner container (20), and the liquid level sensor includes an electrode column (31), and a capacitance sensor is formed between two electrode columns (31) or between the electrode column (31) and the cavity wall of the inner container (20), so as to measure the liquid level of the measured liquid in the inner container (20) in real time; Or the weighing sensor (30) is a parallel beam weighing sensor (33) or an annular force sensor (34); Or the electrode column (31) is a stainless steel column with a polymer film coated on its surface.

3. The flow type liquid viscosity measuring device according to claim 1, characterized in that: A liquid accumulation cup (16) is arranged below the cup body (10), and the liquid accumulation cup (16) is movably connected to the cup body (10).

4. The flow type liquid viscosity measuring device according to claim 1, characterized in that: A flow guide tube (12) is arranged on the inner container outlet hole (21), and the length of the flow guide tube (12) is adapted to the viscosity range of the liquid to be measured. A flow guide ring (22) with a trapezoidal cross section is arranged on the top of the cup body (10), and the flow guide ring (22) is used to gather the liquid to be measured into the inner container (20).

5. The flow type liquid viscosity measuring device according to claim 1, characterized in that: The inner container (20) is a standard viscosity measuring cup (23), which is movably mounted on the cylindrical tray (13); The bottom of the cylindrical tray (13) is provided with an outflow hole which coincides with the axis of the inner container outflow hole (21) and the cup body outflow hole (11); A handle (14) is arranged outside the cup body (10), and a measurement start button (15) is arranged on the handle (14).

6. The flow-type liquid viscosity measuring device according to any one of claims 1 to 5, characterized in that: The invention also comprises: a top cover (50), a liquid inlet pipe (51), a liquid outlet pipe (52), a bypass pipe (53), a three-way valve (54) and a liquid pump (55); wherein the liquid inlet pipe (51) is mounted on the top cover (50), the liquid outlet pipe (52) is mounted on the bottom of the cup body (10) and connected to the outlet hole (11) of the cup body; the bypass pipe (53) is mounted between the liquid inlet pipe (51) and the liquid outlet pipe (52), and a three-way valve (54) is arranged at the connection between the bypass pipe (53) and the liquid inlet pipe (51).

7. The flow type liquid viscosity measuring device according to claim 6, characterized in that: The liquid inlet pipe (51), the flow guide pipe (12) and the cup body outlet hole (11) are arranged in sequence from top to bottom, the inner diameter of the liquid inlet pipe (51) is larger than the diameter of the flow guide pipe (12), and the three-way valve (54) and the liquid pump (55) are both electrically connected to the measuring circuit (40).

8. A method for measuring the viscosity of a flowing liquid, using the device for measuring the viscosity of a flowing liquid according to any one of claims 6 to 7, characterized in that: include: S1. The measuring device is installed in a pipeline conveying the measured liquid, and the axis of the cup body (10) is kept perpendicular to the ground; S2, measurement starts, the three-way valve (54) closes the liquid inlet pipe (51), opens the bypass pipe (53), and the liquid pump (55) starts to flow out from the bypass pipe (53) to update the measured liquid in the pipeline; S3, after the measuring circuit (40) times a period of time t0, the three-way valve (54) is controlled to close the bypass pipe (53) and open the liquid inlet pipe (51), so that the liquid to be measured quickly flows into the inner container (20) through the liquid inlet pipe (51), and the speed at which the liquid flows into the inner container (20) is much higher than the speed at which the liquid flows out through the inner container outlet hole (21); S4, the electrode column (31) measures the real-time height of the measured liquid, and the weighing sensor (30) measures the real-time mass of the measured liquid. When the liquid height reaches a preset value h0, the liquid mass m0 is recorded, and then the liquid inlet pipe (51) is closed, the bypass pipe (53) is opened, and the liquid pump (55) stops working; The density ρ of the liquid to be measured is calculated from m0 and h0 and the cross-sectional area of ​​the inner container (20); S5, the measuring circuit (40) records the mass of the measured liquid changing with time in real time until the mass change per unit time is less than m1, where m1<5g; S6. Calculate the absolute value k of the rate of change of the mass of the measured liquid between a×m0 and b×m0, where: 1>a>0.3, 0.5>ab>0; S7. Calculate and obtain the value of k / ρ, and obtain the viscosity value of the liquid based on the calibration between k / ρ and the viscosity of the liquid.

9. A method for measuring the viscosity of a flowing liquid, used to measure the viscosity of a liquid with little density change, characterized in that: The measuring device according to any one of claims 1 to 5 comprises: S1. Hold the handle (14) to keep the axis of the cup body (10) perpendicular to the ground; S2, the measurement start button (15) is turned on, and the measured liquid quickly flows into the inner container (20) until the height of the liquid in the inner container (20) exceeds 2 / 3 of the height of the inner container (20); S3, keeping the measuring device horizontal until the measured liquid completely flows out of the inner container (20); S4, the measuring circuit (40) records the mass of the measured liquid changing with time in real time until the mass change per unit time is less than m1, where m1<5g; S5, calculating the absolute value k of the rate of change of the mass of the measured liquid between a×M0 and b×M0, where M0 is the maximum mass value of the measured liquid in the liner (20) measured by the weighing sensor (30), 1>a>0.3, 0.5>ab>0; The S6 and k values ​​are related to the viscosity of the liquid being measured, and the viscosity value of the liquid can be obtained through calibration.

10. The measuring method according to claim 8 or 9, characterized in that: A temperature measurement step is also included to provide temperature compensation for the calculated viscosity or density value.

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