Suspension type viscosity and density on-line measuring device

Abstract

The utility model discloses a suspension type viscosity and density on-line measuring device. The device comprises a cavity, a rotating part, a reference rotor, a suspension rotor, a torsional elastic piece and a distance measuring sensor, the rotating part is fixedly connected to the cavity; the reference rotor is fixedly connected to the outer wall of the rotating shaft, synchronously moves along with the rotating shaft and is higher than the liquid level of measured liquid; a suspension detection end is arranged at the upper end of a suspension body of the suspension rotor, the suspension body is connected with the rotating shaft through a torsion elastic piece, the suspension body suspends in detected liquid, the suspension detection end is exposed out of the detected liquid, and the suspension rotor is driven by the rotating shaft to rotate; the distance measuring sensor fixed in the cavity measures the rotating speed of the reference rotor, the axial displacement of the suspension detection end and the phase difference between the reference rotor and the suspension rotor so as to calculate the viscosity and density of the liquid to be measured. The device has the effects of measuring the density and the viscosity of liquid in real time and being high in measurement precision.

Description

Technical Field

[0001] The utility model relates to the field of industrial measurement, in particular to a suspension type viscosity density online measuring device. Background Art

[0002] Online measurement and control of fluid viscosity and density are in great demand in the petrochemical and new energy industries, especially given the rapid growth of the lithium battery industry in recent years. Measuring the viscosity of lithium battery slurries is crucial to the quality of these products. Rotational viscometers are the industry's most important viscosity measurement devices, but they have several drawbacks: First, their complex structure leads to numerous interference factors during measurement. Furthermore, when used for online viscosity measurement, they suffer from sealing issues, which affect measurement accuracy and make them unsuitable for online viscosity measurement. Second, they cannot simultaneously measure the density of the liquid, making it difficult to eliminate interference from density changes in the measured liquid. Utility Model Content

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

[0004] According to one aspect of the present invention, a suspension type viscosity density online measuring device comprises: a cavity, a rotating part, a reference rotor, a suspension rotor, a torsional elastic member and a distance measuring sensor; the cavity channel of the cavity can allow the measured liquid to flow through;

[0005] The rotating part is fixedly connected to the cavity;

[0006] The reference rotor is fixedly connected to the outer wall of the rotating shaft, the reference rotor is higher than the liquid level of the measured liquid, and the reference rotor rotates synchronously with the rotating shaft;

[0007] The upper end of the hollow suspension body of the suspension rotor is provided with a suspension detection end. The upper end of the suspension body is connected to the rotating shaft through a torsional elastic member, so that the suspension body is suspended in the measured liquid and the suspension detection end is exposed to the measured liquid. The suspension rotor is driven to rotate by the rotating shaft.

[0008] The distance sensor is fixedly connected to the cavity. The distance sensor measures the rotation speed of the reference rotor, the axial displacement of the suspended detection end, and the phase difference between the reference rotor and the suspended rotor to calculate the viscosity and density of the liquid to be measured.

[0009] The invention relates to a suspension-type online viscosity and density measurement device, which obtains liquid density by axial displacement of a suspension detection end, obtains liquid viscosity by measuring the phase difference change of a suspension rotor relative to a reference rotor, and corrects the viscosity using the density value, thereby accurately obtaining the viscosity and density of the liquid. The device has the following beneficial effects: first, the device adopts a suspension rotor structure, which can independently suspend in the measured liquid and remain stable during rotation. The suspension rotor and the rotating part are connected only by a torsional elastic member. Therefore, the viscosity and density measurement is not affected by friction and debris blockage of other structures. The structure is simple, there are fewer interference factors during measurement, there is no sealing problem, and the measurement accuracy is greatly improved. Second, the device can measure the density and viscosity of the liquid in real time, and can correct the viscosity value using the density, effectively eliminating the interference of the measured liquid density change on the viscosity measurement. Third, the use of a suspension rotor can avoid the tensile deformation of the torsional elastic member caused by the long-term downward gravity of the rotor, thereby improving the service life and measurement accuracy of the measurement device. Fourth, a distance sensor is used to simultaneously measure the rotation parameters of the reference suspension rotor and the reference rotor. The device has a simple structure and high reliability, and can be applied to different measurement environments with and without magnetic field interference.

[0010] In some embodiments, the measurement and control unit disposed outside the cavity is electrically connected to the distance measuring sensor and the rotating part;

[0011] Or it also includes a temperature sensor electrically connected to the measurement and control unit, the temperature sensor is installed inside the cavity and in contact with the liquid to be measured.

[0012] In some embodiments, the suspended rotor is a metal thin-walled inverted conical shell, which includes a hollow suspended body with a cylindrical shell at the upper end and a cone with the cone tip facing downward at the lower end. The lower stud of the cone can be detachably connected to the counterweight block, and the support member and the cylindrical shell can be detachably connected by a threaded connection or a plurality of radial threaded members in a circumferential array.

[0013] In some embodiments, the lower connecting end of the support member is sleeved on the inner wall of the cylindrical shell, the positioning shoulder of the support member is fitted and connected to the upper wall of the cylindrical shell, and the lower connecting end and the cylindrical shell are connected by a circumferential thread or a radial thread.

[0014] In some embodiments, the rotating part includes a first motor, an external driving magnet, an internal driving magnet, a rotating shaft seat and a rotating shaft; the rotating shaft seat is fixedly connected to the upper wall of the cavity, the middle of the rotating shaft is rotatably connected to the rotating shaft seat, the internal driving magnet is installed on the upper end of the rotating shaft, the internal driving magnet is facing the external driving magnet outside the cavity, and the external driving magnet is installed on the motor shaft of the first motor.

[0015] In some embodiments, the rotating part includes a stepper motor and a rotating shaft. The motor shaft of the stepper motor is the rotating shaft. The stepper motor is fixed outside the upper cover of the cavity. The middle shaft sleeve of the rotating shaft is a sealing ring in the upper through hole of the upper cover.

[0016] In some embodiments, the torsion elastic member is a helical spring hairspring, the outer portion of the hairspring is mounted on the inner side of the support member and the inner portion thereof is mounted on the rotating shaft via a sleeve;

[0017] Or the reference rotor is a narrow strip of metal.

[0018] In some embodiments, the cavity is provided with a liquid inlet and a liquid outlet, the height of the liquid inlet is lower than the height of the liquid outlet, and the height of the reference rotor is higher than the height of the liquid outlet.

[0019] In some embodiments, the distance measuring sensor is at least one optical distance measuring sensor, the support member is a circular ring member, and the suspension detection end is a radial protrusion in the middle of the support member;

[0020] In some embodiments, the distance measuring sensor is at least one magnetic sensor, the suspension detection end is a first magnetic member disposed on the support member, and the reference rotor is mounted with a second magnetic member. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of a suspension-type online viscosity and density measuring device according to a first embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of a suspension-type online viscosity and density measuring device according to a second embodiment of the present invention;

[0023] Figure 3 for Figure 2 Schematic diagram of the suspended rotor shown;

[0024] Figure 4 for Figure 3 A schematic cross-sectional view of the suspended rotor shown;

[0025] Cavity 1, upper cover 11, sealing ring 12, liquid inlet 13, liquid outlet 14;

[0026] Rotating part 2, rotating shaft 20, first motor 21, outer driving magnet 22, inner driving magnet 23, rotating shaft seat 24, stepping motor 25, shaft sleeve 26;

[0027] Reference rotor 3;

[0028] Suspended rotor 4, suspension body 40, cylindrical shell 401, truncated cone 402, lower stud 403, radial through hole 404, support member 41, lower connecting end 410, radial threaded hole 411, positioning shoulder 412, counterweight 42, radial threaded member 43, suspension detection end 44; torsional elastic member 5,

[0029] Distance sensor 6, first magnetic member 61, second magnetic member 62, optical distance sensor 63, radial protrusion 64;

[0030] Measurement and control unit 7; temperature sensor 8. DETAILED DESCRIPTION

[0031] The present invention will be described in further detail below with reference to the accompanying drawings. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inward" and "outward" refer to directions toward or away from the geometric center of a particular component, respectively.

[0032] Figures 1 to 4 The figure schematically shows a suspension type online viscosity and density measurement device according to an embodiment of the present invention. As shown in the figure, the suspension type online viscosity and density measurement device comprises: a cavity 1, a rotating part 2, a reference rotor 3, a suspension rotor 4, a torsional elastic member 5, and a distance sensor 6;

[0033] The cavity 1 can allow the liquid to flow through. Preferably, the cavity 1 is provided with a liquid inlet 13 and a liquid outlet 14, the height of the liquid inlet 13 is lower than the height of the liquid outlet 14, and the height of the reference rotor 3 is higher than the height of the liquid outlet 14.

[0034] The rotating part 2 is fixedly connected to the cavity 1, wherein the vertical rotating shaft 20 of the rotating part 2 is coaxially preferably arranged directly above the suspension rotor 4;

[0035] The reference rotor 3 is fixedly connected to the outer wall of the rotating shaft 20. The reference rotor 3 is preferably a narrow metal strip. The reference rotor 3 is higher than the liquid level of the measured liquid and rotates synchronously with the rotating shaft 20.

[0036] A suspension detection end 44 is provided at the upper end of the hollow suspension body 40 inside the suspension rotor 4. The upper end of the suspension body 40 is connected to the rotating shaft 20 through a torsional elastic member 5, so that the suspension body 40 is suspended in the liquid to be measured and the suspension detection end 44 is exposed to the liquid to be measured. The suspension rotor 4 is driven to rotate by the rotating shaft 20. The suspension body 40 is preferably configured as a cylinder or a sphere; preferably, the torsional elastic member 5 is a spiral spring hairspring, the outer portion of which is mounted on the inner side of the support member 41 and the inner portion is mounted on the rotating shaft 20 through the shaft sleeve 26.

[0037] The distance sensor 6 is fixedly connected to the cavity 1. The distance sensor 6 can also be preferably a magnetic sensor or an optical distance sensor. The distance sensor 6 measures the rotation speed of the reference rotor 3, the axial displacement of the suspension detection end 44, and the phase difference between the reference rotor 3 and the suspension rotor 4 to calculate the viscosity and density of the liquid to be measured.

[0038] The device is a suspension-type online viscosity and density measurement device that obtains liquid density by axial displacement of a suspension detection end 44, obtains liquid viscosity by measuring the phase difference change between the suspension rotor and the reference rotor, and corrects the viscosity using the density value, thereby accurately obtaining the viscosity and density of the liquid. Its beneficial effects are as follows: First, the device adopts a suspension rotor structure, which can independently suspend in the measured liquid and remain stable during rotation. The suspension rotor and the rotating part are connected only by a torsional elastic member 5. Therefore, the viscosity and density measurement is not affected by friction and debris blockage of other structures. The structure is simple, there are fewer interference factors during measurement, and there are no sealing problems, which greatly improves measurement accuracy. Second, the device can measure the density and viscosity of the liquid in real time, and can correct the viscosity value using the density, effectively eliminating interference from changes in the density of the measured liquid on the measured viscosity. Third, due to the use of a suspension rotor, the tensile deformation of the torsional elastic member 5 caused by the long-term downward gravity of the rotor can be avoided, thereby improving the service life and measurement accuracy of the measurement device. Fourth, the distance sensor 6 is used to simultaneously measure the rotation parameters of the reference suspension rotor and the reference rotor. The device has a simple structure and high reliability, and can be applied to different measurement environments with and without magnetic field interference.

[0039] Furthermore, the device includes a measurement and control unit 7, which is located outside the cavity 1 and electrically connected to the distance sensor 6 and the rotating part 2. The measurement and control unit 7 calculates the viscosity and density of the liquid to be measured based on the measurement data of the distance sensor 6. This advantageous effect is that the measurement and control unit 7 obtains real-time parameters and adjusts the measurement parameters, enabling automated measurement.

[0040] Preferably, a temperature sensor 8 electrically connected to the measurement and control unit 7 is further included. The temperature sensor 8 is installed inside the cavity 1 and in contact with the liquid being measured. This has the beneficial effect of obtaining the real-time temperature of the liquid, and performing temperature compensation on the viscosity and density calculations of the liquid through the measurement and control unit 7 to obtain accurate measurement results.

[0041] Furthermore, the suspension rotor 4 is a thin-walled metal inverted conical shell. It includes a hollow suspension body 40, a support member 41, and a counterweight 42. The upper end of the suspension body 40 is a cylindrical shell 401, and the lower end is a frustum 402 with a downwardly tapered tip. A lower stud 403 integrally formed on the lower surface of the frustum 402 is removably connected to the threaded hole of the counterweight 42. The support member 41 is a circular member, and its circumferential wall is removably connected to the upper end of the cylindrical shell 401 via a circumferential thread or a plurality of radial threads 43 arranged in a circumferential array. The following are the advantages of the suspension rotor 4: first, the removable counterweight 42 at the bottom of the suspension rotor 4 not only ensures the suspension stability of the suspension rotor 4, but also allows the mass of the counterweight 42 to be adjusted for density measurements of liquids with different density ranges; second, the counterweight 42 is connected via vertical threads 43, making replacement quick and easy; and third, the support member 41 enables the suspension body 41 to maintain its shape and size, preventing deformation during long-term measurements.

[0042] Preferably, the frustum 402 is a frustum shell, the upper end of which is open and the lower end is sealed and connected integrally via a circular cover; the upper end circular wall of the frustum 402 and the lower end circular wall of the cylindrical shell 401 have the same diameter and are welded into one.

[0043] Preferably, a positioning shoulder 412 is provided at the lower end of support member 41. A lower connecting end 410 of support member 41 is axially sleeved onto the inner wall of cylindrical shell 401. Positioning shoulder 412 of support member 41 is in close contact with the upper wall of cylindrical shell 401. Lower connecting end 410 is provided with a circumferential array of radial threaded holes 411. A plurality of radial through holes 404 are provided in a circumferential array at the upper end of cylindrical shell 401. Radial threads pass through radial through holes 404 and are threadedly connected to radial threaded holes 411. This advantageous effect is that the provision of positioning shoulder 412 and lower connecting end 410 can improve installation accuracy, facilitating accurate viscosity measurement.

[0044] Preferably, a positioning shoulder 412 is provided at the lower end of the support member 41. The lower connecting end 410 of the support member 41 is sleeved with an equal diameter on the inner wall of the cylindrical shell 401. The positioning shoulder 412 of the support member 41 is closely connected to the upper wall of the cylindrical shell 401. The outer wall of the lower connecting end 410 is provided with a circumferential external thread, and the inner wall of the upper end of the cylindrical shell 401 is provided with a circumferential internal thread. The two are connected to form an integral body by rotation. This advantageous effect is that the connection structure is simple and easy to install.

[0045] In the first embodiment, the rotating part 2 includes a first motor 21, an outer driving magnet 22, an inner driving magnet 23, a rotating shaft seat 24 and a rotating shaft 20;

[0046] The shaft seat 24 is fixedly connected to the upper wall of the cavity 1, and the middle of the shaft 20 is rotatably connected to the shaft seat 24. The upper end of the shaft 20 is installed with an internal driving magnet 23, and the internal driving magnet 23 is facing the external driving magnet 22 outside the cavity 1. The external driving magnet 22 is installed on the motor shaft of the first motor 21.

[0047] In embodiment two, the rotating part 2 includes a stepper motor 25 and a rotating shaft 20. The motor shaft of the stepper motor 25 is the rotating shaft 20. The stepper motor 25 is fixed outside the upper cover 11 of the cavity 10. The upper end of the rotating shaft 20 passes through the upper through hole of the upper cover 11. A sealing ring 12 is provided in the upper through hole to connect the rotating shaft 20 to the shaft sleeve.

[0048] In the above two embodiments, the distance sensor 6 can preferably be at least one optical distance sensor 63, the support member 41 is a circular ring member, and the suspension detection end 44 is a radial protrusion 64 in the middle of the support member 41, so that the upper optical distance sensor 63 can measure the phase change of the suspended rotor 4.

[0049] Distance sensor 6 can also preferably be at least one magnetic sensor. The suspension detection end 44 is a first magnetic member 61 mounted on the support member 41, and the reference rotor 3 is mounted with a second magnetic member 62. This magnetic distance sensor measures the rotational speed and axial displacement of the suspended rotor, as well as the phase difference between the reference and suspended rotors. Advantageously, this system utilizes a magnetic sensor or an optical distance sensor to simultaneously measure the rotational parameters of both the reference and suspended rotors. This system has a simple structure, high reliability, and is applicable to both non-magnetic interference and interference-free measurement environments.

[0050] Preferably, in an application scenario requiring high-precision measurement, in order to increase measurement accuracy, the suspended rotor 4 and the reference rotor 3 each require an optical distance measuring sensor 63 for independent measurement or a magnetic sensor for independent measurement.

[0051] A measurement method using the above-mentioned suspension viscosity density online measurement device comprises the following steps:

[0052] S1. Select and configure an appropriate counterweight 42 according to the density range of the measured liquid and install it under the frustum 402 of the suspension rotor 4 so that the suspension rotor 4 can be suspended in the measured liquid and the upper end of its cylindrical shell 401 is higher than the upper surface of the measured liquid;

[0053] S2: The measured liquid enters the chamber from the inlet and reaches the height of the outlet. The suspended rotor 4 moves upward under the buoyancy of the measured liquid to achieve suspension. The rotating part 2 drives the reference rotor 3 and the suspended rotor 4 to rotate at a set speed. The torsional elastic member 5 connected to the suspended rotor 4 undergoes torsional deformation, resulting in a rotational phase difference between the suspended rotor 4 and the reference rotor 3.

[0054] S3, the distance measuring sensor 6 is a magnetic sensor, the first magnetic member 61 is a first magnet block, and the second magnetic member 62 is a second magnet block. The magnetic sensor measures the change in the magnetic field caused by the rotation of the first magnet block and the second magnet block. When the two magnet blocks are closest to the magnetic sensor, the maximum magnetic field strength value output by the magnetic sensor is recorded: the first magnet block B1(n) and the second magnet block B2(n), and the time when the maximum magnetic field strength value of the magnetic sensor appears: the first magnet block T1(n) and the second magnet block T2(n), where n is an integer greater than 0;

[0055] S4. Calculate the period of the maximum magnetic field strength value of the second magnet block: T2(n+1)-T2(n), and obtain the viscosity measurement speed 1 / (T2(n+1)-T2(n));

[0056] After calibration, S5 and B1(n) can be used to measure the axial displacement of the suspended rotor 4, and thus the density of the liquid being measured. When the liquid density changes, the depth to which the suspended rotor is immersed in the liquid also changes (because the buoyancy of the liquid and the weight of the suspended rotor are equal). Since the liquid outlet is fixed, the liquid level in the cavity is consistent. Therefore, different depths of immersion of the suspended rotor in the liquid result in different heights above the liquid surface, resulting in axial displacement. Liquids of different densities are injected into the cavity, and the axial position values ​​are measured. A curve relationship between liquids of different densities and axial position is fitted. When the axial displacement value of an unknown density is measured, the density value can be calculated using the fitted curve relationship.

[0057] S6. Calculate T2(n)-T1(n) to obtain the phase difference between the suspended rotor 4 and the reference rotor 3. This phase difference can be used to calculate the viscosity of the measured liquid through calibration fitting and corrected by the density value. Preferably, for most liquids, this phase difference is linearly related to the viscosity value of the measured liquid, that is, viscosity = k*(T2(n)-T1(n))+c (k and c are constants). Therefore, the viscosity of the measured liquid can be calculated through calibration fitting and corrected by the density value.

[0058] S7, measuring the temperature P of the liquid to be measured, and performing temperature compensation on the calculated viscosity and density values. Another measurement method of the above-mentioned suspension type viscosity and density online measuring device comprises the following steps:

[0059] S1. Select and configure an appropriate counterweight 42 according to the density range of the measured liquid and install it under the frustum 402 of the suspension rotor 4 so that the suspension rotor 4 can be suspended in the measured liquid and the upper end of its cylindrical shell 401 is higher than the upper surface of the measured liquid;

[0060] S2: The measured liquid enters the chamber from the inlet and reaches the height of the outlet. The suspended rotor 4 moves upward under the buoyancy of the measured liquid to achieve suspension. The rotating part 2 drives the reference rotor 3 and the suspended rotor 4 to rotate at a set speed. The torsional elastic member 5 connected to the suspended rotor 4 undergoes torsional deformation, resulting in a rotational phase difference between the suspended rotor 4 and the reference rotor 3.

[0061] S3, the distance sensor 6 is an optical distance sensor 63, and the reference rotor 3 is a narrow strip. When the radial protrusion 64 in the middle of the support member 41 and the reference rotor 3 rotate to the position directly below the optical distance sensor 63, the output of the optical distance sensor 63 will have two corresponding distance peaks. The distance peak corresponding to the radial protrusion 64 is H1(n), and the peak time is T1(n); the peak corresponding to the reference rotor 3 is H2(n), and the peak time is T2(n), where n is an integer greater than 0;

[0062] S4. Calculate T2(n+1)-T2(n) to obtain the viscosity measurement speed 1 / (T2(n+1)-T2(n))

[0063] After calibration, S5 and H1(n) can be used to measure the axial displacement of the suspended rotor 4, and thus the density of the liquid being measured. When the liquid density changes, the depth to which the suspended rotor is immersed in the liquid also changes (because the buoyancy of the liquid and the weight of the suspended rotor are equal). Since the liquid outlet is fixed, the liquid level in the cavity is consistent. Therefore, different depths of immersion of the suspended rotor in the liquid result in different heights above the liquid surface, resulting in axial displacement. Liquids of varying densities are injected into the cavity, and the axial position values ​​are measured. A curve is then fitted to determine the relationship between the different densities and the axial position values. When the axial displacement value of an unknown density is measured, the density value can be calculated using the fitted curve.

[0064] S6. Calculate T2(n)-T1(n) to obtain the phase difference between the suspended rotor 4 and the reference rotor 3. This phase difference can be used to calculate the viscosity of the measured liquid through calibration fitting and corrected by the density value. Preferably, for most liquids, this phase difference is linearly related to the viscosity value of the measured liquid, that is, viscosity = k*(T2(n)-T1(n))+c (k and c are constants). Therefore, the viscosity of the measured liquid can be calculated through calibration fitting and corrected by the density value.

[0065] S7. Measure the temperature P of the liquid being measured and perform temperature compensation on the calculated viscosity and density values.

[0066] The beneficial effect of the above method is that it can simultaneously measure the density, temperature and viscosity of the measured liquid, and use the density value and temperature value to correct the viscosity value, so as to obtain the accurate viscosity value of the measured liquid.

[0067] Preferably, in the above two methods, temperature compensation is usually performed by fitting experimental data. For example, by measuring the difference in readings of the same viscosity liquid at different temperatures, a curve relationship between temperature and liquid viscosity and density can be fitted, and then the measured system temperature is brought into the curve relationship to remove the temperature characteristics of the system itself.

[0068] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A suspension viscosity density online measuring device, characterized in that: include: A cavity (1), a rotating part (2), a reference rotor (3), a suspended rotor (4), a torsional elastic member (5) and a distance measuring sensor (6); the cavity (1) is capable of allowing a liquid to flow through the cavity; The rotating part (2) is fixedly connected to the cavity (1); The reference rotor (3) is fixedly connected to the outer wall of the rotating shaft (20), the reference rotor (3) is higher than the liquid level of the measured liquid, and the reference rotor (3) rotates synchronously with the rotating shaft (20); A suspended detection end (44) is provided at the upper end of the hollow suspended body (40) inside the suspended rotor (4). The upper end of the suspended body (40) is connected to the rotating shaft (20) through a torsional elastic member (5), so that the suspended body (40) is suspended in the liquid to be measured and the suspended detection end (44) is exposed to the liquid to be measured. The suspended rotor (4) is driven to rotate by the rotating shaft (20). The distance sensor (6) is fixedly connected in the cavity (1). The distance sensor (6) measures the rotation speed of the reference rotor (3), the axial displacement of the suspension detection end (44), and the phase difference between the reference rotor (3) and the suspension rotor (4), so as to calculate the viscosity and density of the liquid to be measured.

2. The suspension viscosity density online measuring device according to claim 1, characterized in that: A measurement and control unit (7) disposed outside the cavity (1) is electrically connected to the distance sensor (6) and the rotating part (2); Alternatively, it further includes a temperature sensor (8) electrically connected to the measurement and control unit (7), wherein the temperature sensor (8) is installed inside the cavity (1) and is in contact with the liquid to be measured.

3. The suspension viscosity density online measuring device according to claim 1, characterized in that: The suspension rotor (4) is a metal thin-walled inverted conical shell. The suspension rotor (4) comprises a suspension body (40) with a hollow interior, a cylindrical shell (401) at the upper end, and a truncated cone (402) with a downwardly pointed cone at the lower end. The lower stud (403) of the truncated cone (402) is detachably connected to a counterweight (42). The support member (41) and the cylindrical shell (401) are detachably connected via a threaded connection or a plurality of radial threaded members (43) in a circumferential array.

4. The suspension viscosity density online measuring device according to claim 3, characterized in that: The lower connecting end (410) of the support member (41) is sleeved with an equal diameter on the inner wall of the cylindrical shell (401), the positioning shoulder (412) of the support member (41) is fitted and connected to the upper wall of the cylindrical shell (401), and the lower connecting end (410) and the cylindrical shell (401) are connected via a circumferential thread or a radial thread member (43).

5. The suspension viscosity density online measuring device according to claim 1, characterized in that: The rotating part (2) comprises a first motor (21), an external driving magnet (22), an internal driving magnet (23), a rotating shaft seat (24) and the rotating shaft (20); the rotating shaft seat (24) is fixedly connected to the upper wall of the cavity (1); the middle of the rotating shaft (20) is rotatably connected to the rotating shaft seat (24); the upper end of the rotating shaft (20) is installed with the internal driving magnet (23); the internal driving magnet (23) faces the external driving magnet (22) outside the cavity (1); and the external driving magnet (22) is installed on the motor shaft of the first motor (21).

6. The suspension viscosity density online measuring device according to claim 1, characterized in that: The rotating part (2) includes a stepper motor (25) and a rotating shaft (20), wherein the motor shaft of the stepper motor (25) is the rotating shaft (20), and the stepper motor (25) is fixed outside the upper cover (11) of the cavity (1), and the middle shaft of the rotating shaft (20) is sleeved with a sealing ring (12) in the upper through hole of the upper cover (11).

7. The suspension viscosity density online measuring device according to claim 3, characterized in that: The torsion elastic member (5) is a spiral spring hairspring, the outer portion of the hairspring is mounted on the inner side of the support member (41) and the inner portion is mounted on the rotating shaft (20) via a sleeve (26); Alternatively, the reference rotor (3) is a narrow metal strip.

8. The suspension viscosity density online measuring device according to claim 1, characterized in that: The cavity (1) is provided with a liquid inlet (13) and a liquid outlet (14); the height of the liquid inlet (13) is lower than the height of the liquid outlet (14); and the height of the reference rotor (3) is higher than the height of the liquid outlet (14).

9. The suspension viscosity density online measuring device according to claim 3, characterized in that: The distance measuring sensor (6) is at least one optical distance measuring sensor (63), the support member (41) is a circular ring member, and the suspension detection end (44) is a radial protrusion (64) in the middle of the support member (41).

10. The suspension viscosity and density online measuring device according to claim 3, characterized in that: The distance measuring sensor (6) is at least one magnetic sensor, the suspension detection end (44) is a first magnetic member (61) arranged on the support member (41), and the reference rotor (3) is equipped with a second magnetic member (62).

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