KR102326488B1 - Stirring device and method for measuring viscosity of solution - Google Patents

Abstract

In the method for measuring the viscosity of a solution by a stirring device for measuring the viscosity of the solution according to an embodiment of the present invention, the stirring device includes a memory, the memory includes: type data related to a plurality of impellers and containers; For the plurality of impellers and containers, the first function data for the rotation speed and torque calculated by stirring the solutions of the first solution and the second solution with known viscosities while increasing or decreasing the rotation speed of the impeller; And with respect to the plurality of impellers and containers, the rotational speed measured while increasing or decreasing the voltage supplied to the motor in the no-load state and the rotational speed measured while increasing or decreasing the voltage supplied to the motor to which an arbitrary load is applied The second function data for voltage and torque calculated based on identifying based on constructing a calculation formula for calculating the viscosity of the solution based on the first function data and the second function data corresponding to at least one of the identified impeller and the container; Calculating the rotation speed and voltage value of the impeller by stirring the solution composed of the calculation formula; and calculating the viscosity of the solution by substituting the calculated rotational speed and voltage value in the calculation formula.

Description

A stirring device for measuring the viscosity of a solution and a method for measuring viscosity

A solution viscosity measuring stirring device and method according to the present invention relates to a stirring device and a viscosity measuring method capable of measuring viscosity while stirring a solution.

In general, a stirrer is a generic term for a device or device that stirs and mixes gas, liquid, and solid (including particulate) phase objects and substances in chemical experiments and manufacturing chemical industries. exist.

In particular, the stirrer used in the laboratory is mainly small and is mainly used for the purpose of mixing liquids. Since the force required varies according to the size of the volume and viscosity of the liquid to be mixed, there are various types of structures and various types of stirrers based on the principle.

A stirring blade rotary stirrer, which is a typical stirrer, is widely used in industry, and an overhead stirrer equipped with an actuator is mainly used in the laboratory. The overhead stirrer is located on the upper part of the object to be stirred and agitates the object by rotating the stirring blade with the actuator, and various impellers (stirring blades) can be used depending on the object to be stirred.

If the viscosity of the stirred solution is known, it can be usefully used and a stirrer capable of measuring the viscosity of the solution is provided. Because many parts are used, the price of the stirrer itself is expensive.

US Patent Publication No. 2005-0087002 (Title of the invention: Viscosity-change-detecting apparatus and stirring rotor, published on April 28, 2005)

A solution viscosity measuring stirring device and a method according to an embodiment of the present invention are intended to enable the measurement of the viscosity of a solution without a torque sensor.

The solution viscosity measurement stirring device according to an embodiment of the present invention is intended to enable measurement of the viscosity of a solution that is differentiated according to the identified impeller and/or vessel.

In the method for measuring the viscosity of a solution by a stirring device for measuring the viscosity of the solution according to an embodiment of the present invention, the stirring device includes a memory, the memory includes: type data related to a plurality of impellers and containers; For each of the plurality of impellers and containers, the first function data representing the relationship between the rotational speed and the torque with respect to the viscosity obtained by stirring two or more solutions of known viscosity while increasing or decreasing the rotational speed of the impeller, respectively; And for each of the plurality of impellers and containers, the rotation speed measured while increasing or decreasing the voltage supplied to the motor in a no-load state and the rotation measured while increasing or decreasing the voltage supplied to the motor to which an arbitrary load is applied The second function data representing the relationship between the rotational speed and the voltage with respect to the torque obtained based on the speed is stored, and at least one of the impeller stirring the solution, which is the object of viscosity measurement, and the container for accommodating the solution is stored in the memory. identifying based on type data related to the impeller and the vessel; constructing a calculation formula for calculating the viscosity of the solution based on the first function data and the second function data corresponding to at least one of the identified impeller and the container; Measuring the rotational speed and voltage value of the impeller by stirring the solution composed of the calculation formula; and calculating the viscosity of the solution by substituting the measured rotational speed and voltage value in the calculation formula.

In this embodiment, the motor may provide a solution viscosity measurement method for controlling the output with a duty ratio using a PWM (Pulse Width Modulation) method.

In the stirring device for measuring the viscosity of a solution using an impeller according to an embodiment of the present invention, a motor for rotating the impeller; a control unit for controlling the driving of the motor; and a memory, wherein the memory includes: type data related to a plurality of impellers and containers; For each of the plurality of impellers and containers, the first function data representing the relationship between the rotational speed and the torque with respect to the viscosity obtained by stirring the first and second solutions of known viscosity while increasing or decreasing the rotational speed of the impeller, respectively ; And for each of the plurality of impellers and containers, the rotation speed measured while increasing or decreasing the voltage supplied to the motor in a no-load state and the rotation measured while increasing or decreasing the voltage supplied to the motor to which an arbitrary load is applied An object of the present invention is to provide a solution viscosity measuring stirring device in which second function data for rotation speed and voltage for torque obtained based on the speed are stored.

In this embodiment, the container is combined with a container identification mark so as to identify the type of the container, and the stirring device recognizes the container identification mark to identify the type of the container. A viscosity measuring stirring device may be provided.

In this embodiment, the container identification mark is an RFID tag, and the container identification identification unit is a reader that reads information stored in the RFID tag, it is possible to provide a solution viscosity measuring stirring device.

Solution viscosity measurement stirring device according to an embodiment of the present invention is intended to enable the measurement of the viscosity of the solution without a torque sensor.

The solution viscosity measurement stirring device according to an embodiment of the present invention is intended to enable the measurement of the viscosity of the solution, which is differentiated according to the type of the impeller, the type of the container, and the amount of the solution.

1 is a view showing a solution viscosity measuring stirring device according to an embodiment of the present invention.
2 is a view showing a stirring device, various types of impellers and containers according to an embodiment of the present invention.
3 is a flowchart showing a method of configuring data for measuring the viscosity of a mixed solution in the stirring device for measuring the viscosity of a solution according to an embodiment of the present invention.
4 is a view showing a graph showing a change in torque with respect to the rotational speed according to the viscosity of the solution.
5 is a view showing a rotation speed change graph with respect to a duty ratio in a no-load state of the motor according to an embodiment of the present invention.
6 is a view showing a rotational speed change graph with respect to a duty ratio in a constant load state of the motor according to an embodiment of the present invention.
7 is a flowchart illustrating a method for measuring solution viscosity according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily carry out the present invention. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. And, in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is "connected" to another part, this includes not only the case of being "directly connected" but also the case of being "electrically connected" with another element interposed therebetween. . In addition, when a part "includes" a certain component, this means that other components may be further included, rather than excluding other components, unless otherwise stated.

Hereinafter, a solution viscosity measuring stirring device according to an embodiment of the present invention will be described in detail.

1 is a view showing a solution viscosity measuring stirring device according to an embodiment of the present invention. 2 is a view showing a stirring device, various types of impellers and containers according to an embodiment of the present invention.

1 and 2, the viscosity measuring stirring device according to the present invention is a motor 110 through a chuck unit 200 in the stirring device body 100 and the stirring device body 100 to which the motor 110 is mounted. ) and a rotating impeller 300, a support 400 connected to the stirring apparatus main body 100 to support the stirring apparatus main body 100, and a support 600 connected to the lower end of the support 400 and , is provided in the stirring device body 100, the motor 110 and the controller and the impeller 300 for controlling various operations of the viscosity measuring stirring device according to the present invention are accommodated, the mixture is mixed, the support portion 600 upper It may include a container 500 placed on the.

Here, the motor 110 may be any type of actuator capable of transmitting rotational force, such as an AC motor or a DC motor, and may also be directly driven or indirectly driven such as a belt gear.

In addition, the chuck unit 200 may be configured to be detachably attached to the stirring device body 100 , or may be configured as an integral body. When the chuck unit 200 is integrally configured, the impeller 300 may be detachably coupled to the chuck unit 200 , but may be viewed as coupled to the stirring device body 100 .

The impeller 300 is coupled to one end of the stirring blade 310 for stirring the mixture accommodated in the container 500. Referring to FIG. 2 , various types of impellers 300 can be seen.

In addition, an impeller identification means (not shown) is coupled to one side of the impeller 300 so that the control unit 120 can identify the type of the impeller 300 , and the impeller identification is on one side of the stirring device body 100 . and a discrimination unit (not shown) for impeller identification for recognizing the means to identify the type of the impeller 300 .

The discrimination unit for identification of the impeller may recognize the means for identification of the impeller in a non-contact manner, and may use an optical method or a magnetic field method as that method.

The means for identifying the impeller according to an embodiment of the present invention is a magnet part attached to the impeller 300 to identify the type of the impeller, and the discrimination unit for impeller identification is the impeller 300 is the stirring device body 100 or chuck It may include a magnetic field detection sensor (not shown) for detecting a change in the magnetic field generated by the magnet unit attached to the impeller 300 when coupled to or separated from the unit 200 . Here, the magnet unit may be any one of all materials capable of causing a change in a magnetic field, such as a permanent magnet, an electromagnet, a ferromagnetic material, and the magnetic field sensor may be any one of all types of sensors capable of measuring a change in the magnetic field. The identification unit for impeller identification can identify the type of the impeller 300 by a change in the magnetic field, and the configuration except for the identification unit for impeller identification at this time is the change in the magnetic field generated by the identification unit for impeller identification from the impeller identification means. It is desirable to be designed so that there is no difficulty in measuring .

In addition, a mark 510 for container identification is coupled to the lower end of the container 500 to identify the type of container 500 , and the container 500 is placed on the base 600 where the container identification mark 510 . and a determination unit 610 for container identification that recognizes and identifies the type of container 500 .

For example, the label 510 for container identification according to the present invention is an RFID tag, and the identification unit 610 for container identification may include a reader (not shown) that reads information stored in the RFID tag. However, the present invention is not limited thereto, and it is of course possible to identify the type of the container by using an optical or magnetic field change.

The controller 120 may measure the viscosity of the mixture accommodated in the container 500 by receiving the information of the motor 110 , the information of the impeller 300 , and the information of the container 500 , as will be described later.

At this time, the information of the motor 110 is the characteristic (rotational speed-duty ratio) of the motor 110 , the information of the impeller 300 is the type of the impeller 300 , and the physical quantity information of the container 500 is the container 500 . ) can be the diameter.

Meanwhile, the controller 120 may include a memory (not shown) and a processor (not shown). The memory may be a storage medium in which a program for measuring solution viscosity and experimental coefficient data are recorded. Specifically, the memory is a plurality of impellers and containers related to the type data, for the plurality of impellers and containers, the solutions of the first solution and the second solution having known respective viscosities are stirred while increasing or decreasing the rotational speed of the impeller. With respect to the first function data representing the relationship between the rotation speed and the torque for the obtained viscosity, and the plurality of impellers and containers, the measured rotation speed and any The second function data representing the relationship between the rotation speed and the voltage with respect to the torque obtained based on the rotation speed measured while increasing or decreasing the voltage supplied to the motor to which the load is applied may be stored.

The memory may perform a function of temporarily or permanently storing data processed by the processor. Here, the memory may include a volatile storage medium or a non-volatile storage medium, but the scope of the present invention is not limited thereto.

Here, the processor may include all kinds of devices capable of processing data, such as a processor. Here, the 'processor' may refer to a data processing device embedded in hardware, for example, having a physically structured circuit to perform a function expressed as a code or an instruction included in a program. As an example of the data processing device embedded in the hardware as described above, a microprocessor, a central processing unit (CPU), a processor core, a multiprocessor, an application-specific integrated (ASIC) circuit) and a processing device such as a field programmable gate array (FPGA), but the scope of the present invention is not limited thereto.

The stirring device body 100 may further include a screen output means 130 and a sound output means 140 for displaying various operations and states of the viscosity measuring stirring device according to the present invention.

According to the type of the impeller 300 identified by the control unit 120, the type of the container 500, the information of the identified impeller 300 set or stored in advance, the information of the container 500, the screen output means 130 or It may notify the user through the sound output means 140 . Here, the screen output means 130 may be any means capable of displaying information graphically to the user, such as an LCD panel, a TFT panel, and a touch screen, and the sound output means 140 may output a sound or voice such as a speaker. All means are possible.

Here, the screen output means 130 displays the viscosity of the mixture according to the type of the impeller 300 and the type of the container 500 , and the torque of the motor 110 for mixing the mixture according to the viscosity of the mixture etc. may also be displayed.

In addition, the sound output means 140 may output the type of the impeller 300, the type of the container 500, and the viscosity of the usable mixture through voice, and if necessary, a horn sound (in case of danger) or A notification sound (operation time and completion time, etc.) may be output, and the type of the container 500 may be displayed according to the type of notification sound.

Hereinafter, a method for measuring solution viscosity using a solution viscosity measuring stirring device according to an embodiment of the present invention will be described in detail.

3 is a flowchart showing a method of configuring data for measuring solution viscosity in a solution viscosity measuring stirring device according to an embodiment of the present invention. 4 is a view showing a graph showing a change in torque with respect to the rotational speed according to the viscosity of the solution.

3 and 4, first, the memory of the stirring device for measuring the viscosity of the solution according to an embodiment of the present invention is a plurality of impellers and containers related type data, first function data and second function data are stored it could be

Specifically, in the method of preparing the first function data and the second function data, the first solution and the second solution, each having a known viscosity, are stirred while increasing or decreasing the rotational speed of the impeller 300 respectively to increase the viscosity. A step ( S310 ) of obtaining first function data representing the relationship between the rotation speed and the torque may be performed.

Here, the data on the viscosity need not be two types of solutions, and it is possible to secure data on the viscosity of more types of solutions, but it is possible to obtain data on the viscosity of two types of solutions with sufficiently high accuracy through interpolation of the data on the viscosity of the two types of solutions. Viscosity calculations for any solution are possible. To this end, experimental coefficient data distinguished according to at least one of the type of the impeller 300 , the diameter of the container containing the solution, and the amount of the solution are stored in advance in the stirring device, and the viscosity of the solution is based on the experimental coefficient data It may be calculated by

The solution is stirred using the selected container, solution, and the impeller 300 , but the rotation speed of the impeller 300 is started from 0 and the torque can be measured while gradually increasing it. The actual measured data can be seen in FIG. 4 , and it can be seen that as the rotational speed N increases, the magnitude of the torque T acting on the impeller 300 also increases. In this experimental example, when looking at the aspect of the torque change according to the rotation speed, it is expressed as a second-order polynomial. In [Equation 1] below, it is expressed as a polynomial, but another function that can express the change in torque may be used. Calculating the first function data to calculate the viscosity of the solution may be performed through the following [Equation 1].

γ: viscosity

T _γ (N), T: torque

N: rotation speed

γ ₁ : Viscosity of the first solution

γ ₂ : Viscosity of the second solution

a ₁ , b ₁ , c ₁ : Experimental coefficient of the first solution

a ₂ , b ₂ , c ₂ : Experimental coefficient of the second solution

4 and [Equation 1], the coefficients f(γ), g(γ), and h(γ) of the polynomial are arbitrary functions, that is, coefficients that vary depending on the viscosity. For different γ values (in this case, γ ₁ >γ ₂ ), T _γ (N) can be expressed as a curve showing different trends. Here, if the coefficients f(γ), g(γ), and h(γ) of the polynomials that vary depending on the viscosity γ can be obtained, it is possible to derive the equation for calculating the viscosity inversely through the rotational speed and torque data for any viscosity. thing becomes possible

[Equation 1] is that if the relationship between the rotational speed (N) and the torque (T) of the first and second solutions of which the viscosity is known can be known through an experiment, the rotational speed (N) and It shows that the viscosity of a solution can be calculated based on the torque (T). In [Equation 1], the coefficients will vary depending on the impeller 300, the type of the container, and the amount of the solution, so an experiment is conducted for each case, and the coefficients obtained through this are stored in memory in advance. there is a need Here, the first solution experimental coefficient and the second solution experimental coefficient may be included in the first function data.

After the step S310, a step S320 of obtaining second function data representing the relationship between the rotation speed and the voltage with respect to the torque based on the rotation speed and the voltage supplied to the motor may be performed.

In general, since the stirring device is equipped with a rotary encoder, there is no problem in obtaining information about the rotational speed. However, for information on torque, a dedicated torque sensor must be installed, but the sensor that measures the torque while it is rotating is very expensive, so it is impossible to employ it in a general stirring device.

Therefore, it is intended to present a method for obtaining the torque required to calculate the viscosity of the solution through calculation. The relationship between the torque, rotational speed, and voltage applied to the current motor of a general DC motor (BLDC motors have similar characteristics) is as shown in [Equation 2] below.

N: rotation speed

T: torque of the motor

D: duty ratio

l, m, n: solution experimental coefficients

Here, the solution experiment coefficient may be included as the second function data.

In the case of the stirring device, the drive shaft of the motor is connected to the drive shaft of the impeller 300 through a reduction mechanism such as a timing belt, and there is also a loss due to a friction mechanism such as a bearing in the process. However, since it can be seen that the linear relationship between the voltage supplied to the motor, the speed of the driving shaft of the impeller 300 and the load torque of the impeller 300 is maintained, [Equation 2] can be applied. Here, the solution experiment coefficient may be included in the second function data.

Meanwhile, the controller may control the motor with a duty ratio using a pulse width modulation (PWM) method.

Specifically, calculating the torque is performed through [Equation 2], and based on the experimental coefficients obtained by increasing or decreasing the duty ratio in a state where the motor is no load, m and n, which are the experimental coefficients of the solution, are calculated and , may include calculating l based on an experimental coefficient obtained by increasing or decreasing the duty ratio in a state where an arbitrary load is applied to the motor. Here, the solution experiment coefficient may be included as the second function data.

Step (S320) Next, on the basis of the first function data and the second function data, a calculation formula for calculating the viscosity of an arbitrary solution is constructed, and the rotation speed and voltage value of the arbitrary solution are measured to calculate the viscosity (S330) ) can be performed.

5 is a view showing a rotation speed change graph with respect to a duty ratio in a no-load state of the motor according to an embodiment of the present invention. 6 is a view showing a rotational speed change graph with respect to a duty ratio in a constant load state of the motor according to an embodiment of the present invention.

5 to 6 , the step of acquiring the second function data (S320) includes the steps of measuring the rotational speed while increasing or decreasing the voltage supplied to the motor in a no load state and an arbitrary load. It may include measuring the rotation speed while increasing or decreasing the voltage supplied to the motor. Next, a step of acquiring second function data representing the relationship between the rotation speed and the voltage with respect to the torque may be performed.

Measure the rotation speed while changing the duty ratio supplied to the motor from the minimum value (0) to the maximum value (100%) in the no load state. Since there is no load, the expression N=lT+mD+n is transformed as N=mD+n.

Referring to FIG. 5 , a trend line of the measured rotational speed and the data can be seen while changing the duty ratio actually supplied to the motor from the minimum (0%) to the maximum (100%). According to this trend line, it can be seen that m = 14.321 and n = 18.579. In order to obtain the coefficient l of the torque term, additional measurement data is required, and in this case, it should be measured after applying an arbitrary load.

Referring to FIG. 6 , the relationship between the duty ratio and the rotation speed measured in a state in which a load of 7 kgf·cm is applied to the stirring device and a trend line thereof can be seen. By substituting an arbitrary point on this data into N=lT+mD+n, it is possible to obtain l.

In conclusion, when the controller controls the motor in the PWM (Pulse Width Modulation) method and the voltage is output as a duty ratio, calculating the viscosity of the solution can be performed using the following [Equation 3]. can

γ: viscosity

N: rotation speed

T: torque of the motor

D: duty ratio

l, m, n: solution experimental coefficients

γ ₁ : Viscosity of the first solution

γ ₂ : Viscosity of the second solution

a ₁ , b ₁ , c ₁ : Experimental coefficient of the first solution

a ₂ , b ₂ , c ₂ : Experimental coefficient of the second solution

Here, _{the coefficient values of a 1} , b ₁ , c ₁ and a ₂ , b ₂ , and c ₂ may have different values depending on the type of the impeller, the type of the container, and the amount of the solution.

Hereinafter, a method for measuring the viscosity of a solution using Equation 3 will be described in detail.

In the method of measuring the viscosity of the solution, first, the step of identifying at least any one of the impeller for stirring the solution and the container for accommodating the solution based on the type data related to the plurality of impellers and the container stored in the memory (S810) may be performed. .

Step (S810) Next, the step (S820) of constructing a calculation formula for calculating the viscosity of the solution based on the first function data and the second function data corresponding to at least one of the identified impeller and the container (S820) can be performed. have.

Step (S820) Next, a step (S830) of calculating the rotational speed and voltage value of the impeller by stirring the solution in which the formula is composed may be performed.

Step (S830) Next, a step (S840) of calculating the viscosity of the solution by substituting the rotation speed and voltage value into the calculation formula may be performed.

The above-described method for measuring the viscosity of a solution using a solution stirring device according to an embodiment of the present invention has an effect that the viscosity of the solution can be easily measured by measuring only the duty ratio according to the rotational speed and voltage value of the solution.

The above description is merely illustrative of the technical idea of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: agitator body
110: motor
120: control unit
130: screen output means
140: sound output means
200: chuck unit
300: impeller
310: blade for stirring
400: support
500: courage
510: mark for container identification
600: support
610: determination unit for container identification

Claims (8)

In the method of measuring the viscosity of a solution by a stirring device for measuring the viscosity of the solution,
The stirring device includes a memory,
The memory may include type data related to a plurality of impellers and containers;
For each of the plurality of impellers and containers, the first function data representing the relationship between the rotational speed and the torque with respect to the viscosity obtained by stirring two or more solutions of known viscosity while increasing or decreasing the rotational speed of the impeller, respectively; and
For each of the plurality of impellers and containers, increase or decrease the voltage supplied to the motor for driving the impeller in the no-load state while increasing or decreasing the measured rotational speed and the voltage supplied to the motor to which an arbitrary load is applied. The second function data representing the relationship between the rotation speed and the voltage with respect to the torque obtained based on the rotation speed measured while decreasing is stored,
identifying at least one of an impeller for stirring a solution subject to viscosity measurement and a container for accommodating the solution based on type data related to a plurality of impellers and containers stored in the memory;
constructing a calculation formula for calculating the viscosity of the solution based on the first function data and the second function data corresponding to at least one of the identified impeller and the container;
measuring the rotation speed and voltage value of the impeller by stirring the solution comprising the formula; and
Comprising the step of calculating the viscosity of the solution by substituting the measured rotation speed and voltage value in the calculation formula, the solution viscosity measuring method. According to claim 1,
The first function data is a solution viscosity measuring method including the first solution experimental coefficient and the second solution experimental coefficient calculated through the following [Equation 1].
[Equation 1]

γ: viscosity
T _γ (N), T: torque
N: rotation speed
γ ₁ : Viscosity of the first solution
γ ₂ : Viscosity of the second solution
a ₁ , b ₁ , c ₁ : Experimental coefficient of the first solution
a ₂ , b ₂ , c ₂ : Experimental coefficient of the second solution According to claim 1,
The motor is a method of measuring the viscosity of a solution, the output is controlled by a duty ratio (Duty Ratio) using a PWM (Pulse Width Modulation) method. According to claim 1,
The second function data will include the experimental coefficient calculated through the following [Equation 2], the solution viscosity measuring method.
[Equation 2]

N: rotation speed
T: torque of the motor
D: duty ratio
l, m, n: solution experimental coefficients 5. The method of claim 4,
Calculating the viscosity of the solution is to be performed using the following [Equation 3], the solution viscosity measuring method.
[Equation 3]

γ: viscosity
N: rotation speed
T: torque of the motor
D: duty ratio
l, m, n: solution experimental coefficients
γ ₁ : Viscosity of the first solution
γ ₂ : Viscosity of the second solution
a ₁ , b ₁ , c ₁ : Experimental coefficient of the first solution
a ₂ , b ₂ , c ₂ : Experimental coefficient of the second solution In the stirring device for measuring the viscosity of a solution using an impeller,
a motor for rotating the impeller;
a control unit for controlling driving of the motor; and
including memory,
The memory may include type data related to a plurality of impellers and containers;
For each of the plurality of impellers and containers, a first function representing the relationship between rotational speed and torque for viscosity obtained by stirring the first and second solutions of known viscosity while increasing or decreasing the rotational speed of the impeller, respectively data; and
For each of the plurality of impellers and containers, the rotation speed measured while increasing or decreasing the voltage supplied to the motor in a no-load state and the rotation measured while increasing or decreasing the voltage supplied to the motor to which an arbitrary load is applied The second function data representing the relationship between the rotational speed and the voltage with respect to the torque obtained based on the speed is stored, the solution viscosity measuring stirring device. 7. The method of claim 6,
The container is coupled with a mark for container identification so as to identify the type of the container,
The stirring device includes a container identification discrimination unit for recognizing the container identification mark to identify the type of the container, the solution viscosity measuring stirring device. 8. The method of claim 7,
The mark for identifying the container is an RFID tag,
The determination unit for container identification is a reader for reading information stored in the RFID tag, a solution viscosity measuring and stirring device.

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