JP2876377B2 - Calibration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a calibration device, and is suitably applied to, for example, a calibration device for a rotational viscometer.

[0002]

2. Description of the Related Art Conventionally, there is a viscometer for measuring the viscosity of a liquid as shown in FIG. That is, FIG.
1, the rotational viscometer 1 includes a viscometer main body 2 and a rotor 3. In the viscometer main body 2,
It has a rotating shaft 4 projecting vertically downward from the lower surface, and a semi-annular screw 4A is provided at a lower end of the rotating shaft 4.

In the rotor portion 3, a cylindrical rotor 3B is attached to the lower end of a rod-shaped rotor support member 3A, and a hook-shaped engagement member 3C is provided at the upper end of the rotor support member 3A. And the engagement member 3C
Is attached to the viscometer main body 2 by hooking it on a screw 4A of the viscometer main body 2. Accordingly, the rotation of the rotation shaft 4 of the viscometer main body 2 causes the rotor 3 to rotate integrally with the rotation shaft 4. Thus, the rotor 3 of the rotary viscometer 1 is immersed in the liquid to be measured, and the rotary shaft 4 of the rotary viscometer main body 2 is driven to rotate, whereby the viscous resistance of the liquid applied to the rotor 3 rotates to the rotary shaft 4 as it is. Add as resistance. Therefore, by measuring the rotation resistance in the viscometer main body 2, the viscosity of the liquid can be measured based on the resistance value.

Here, in the rotational viscometer 1, it is necessary to execute calibration in an inspection process or the like at the time of product shipment in order to correctly measure the viscosity of the liquid to be measured from the resistance value applied to the rotating shaft 4. In this case, a calibration device 10 is used as an auxiliary device. The calibration device 10 has a cup 12 disposed in a thermostatic chamber 11.
In addition, water 13 is stored between the cups 12, and a calibration liquid 14 having a known viscosity characteristic with respect to temperature, such as a viscometer calibration standard liquid, is injected into the cup 12 for use.

[0005] As a result, in the calibration device 10, the water 13
Is maintained at a predetermined temperature, the calibration liquid 14 can be brought to the predetermined temperature. As a result, the calibration liquid 14
Can be set to a desired viscosity. Therefore, in the calibration work of the rotational viscometer 1, the rotational viscometer 1
Is immersed in the calibration liquid 14 maintained at a predetermined temperature, and the rotor 3 is rotated in this state. At this time, the meter (not shown) of the rotational viscometer 1
The adjustment is performed so as to show a viscosity corresponding to the temperature at that time of No. 4.

[0006]

However, in the viscosity calibration operation using such a calibration device 10, it takes about three hours for the temperature of the calibration liquid 14 injected into the cup 12 of the thermostat 11 to stabilize. When necessary, and when calibrating one rotational viscometer 1 using a plurality of types of calibration liquids, it is necessary to replace the rotor unit 3 each time so as to prevent the calibration liquid 14 from being mixed. As a result, there is a problem that the calibration work takes time. In the viscosity calibration operation using such a calibration device 10, since the viscosity of the standard solution for the calibration of the viscometer with respect to the temperature of 1 ° C. varies from 1.7 to 11.2 [%] depending on the type, the temperature of the thermostatic bath is changed. 11
It is difficult to set and control the temperature of the sample, and it is necessary to periodically exchange the solution because the standard solution for calibrating the viscometer changes with time.

Further, in the viscosity calibration work using such a calibration device 10, water and foreign substances in the thermostatic chamber 11 are liable to be mixed into the standard solution for viscometer calibration at the time of use. Since the installation place of the calibration device 10 is limited near the water place, there is a problem that the movement is difficult.

[0008] The present invention has been made in view of the above points, and an object of the present invention is to propose a remarkably user-friendly calibration device.

[0009]

According to the present invention, when the rotor 3 attached to the rotating shaft 4 is rotated in a liquid whose viscosity is to be measured, the rotor 3 receives the liquid from the liquid. A calibrating device used for calibrating a rotational viscometer 1 for measuring the viscosity of a liquid based on power, comprising a rotating body made of a conductive material that is engaged with a rotating shaft 4 of the rotating viscometer 1 and rotates integrally with the rotating shaft 4. 37, and magnetic field generating means 22, 62, 72A, 72B for generating a DC magnetic field intersecting with the rotating body 37.

[0010]

[0011]

According to the present invention, the DC magnetic field generated by the magnetic field generating means 22, 62, 72A, 72B causes the rotational shaft 4 of the rotational viscometer 1 to receive from the calibration liquid based on the viscosity resistance of the calibration liquid. The same braking force as the power can be applied, and thus the calibration of the rotational viscometer can be performed without using the calibration liquid. This eliminates the need for a calibration liquid and a storage facility for the calibration liquid, and saves unnecessary time associated with calibration work using the calibration liquid, thereby shortening the time required for the calibration work of the rotational viscometer. can do.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

(1) First Embodiment In FIG. 1 in which parts corresponding to those in FIG. 11 are assigned the same reference numerals, reference numeral 20 denotes a calibration device for a rotational viscometer as a whole, and a rotating unit 21 and a DC magnetic flux generating unit 22. It is composed of
In the rotating portion 21, a bearing plate support column 30 formed in a column shape is implanted on one end side of a plate-like base member 31, and protrudes horizontally at an upper end portion and a central portion of the bearing plate support column 30. Brim-shaped bearing support plates 32A and 32B
Are attached.

A rod-shaped shaft member 34 is rotatably supported by the bearing support plates 32A and 32B via bearings 33A and 33B, respectively, and the shaft member 34 is supported by rotating plate collars 35A and 35B. A disk-shaped rotary plate 37 made of a conductive material is fitted and fixed, whereby the rotary plate 37 rotates integrally with the shaft member 34. A hook 34 is provided at the upper end of the shaft member 34.
A is formed, and the hook 34A is engaged with the screw 4A of the rotating shaft 4 of the viscometer main body 2 so that the shaft member 34 and the rotating plate 37 are rotated when the rotating shaft 4 is rotated. Can be integrally rotated about the center.

On the other hand, in the DC magnetic flux generating section 22, a yoke 40 made of an iron material and having a U-shaped cross section is provided with a base member 31.
Is mounted on the other end side. The upper side 40 of this yoke 40
A and the lower side portion 40B have a cylindrical iron core 41, respectively.
A and 41B are coaxial, and the lower surface of the iron core 41A and the upper surface of the
It is mounted using nuts 42A and 42B so as to face.

A conductive wire is wound around each of the iron cores 41A and 41B to form coils 43A and 43B, and a current variable DC power supply 44 is electrically connected to each of the coils 43A and 43B. Iron core 4
A magnetic field having a strength corresponding to the amount of current supplied from the variable current type DC power supply 44 to the coils 43A and 43B can be generated between 1A and 41B. When the rotating plate 37 is rotated in this state, an eddy current is generated in the rotating plate 37, and a force (braking force) for braking the rotating plate 37 is generated. Accordingly, if this braking force acts as a load on the rotating shaft 4 of the viscometer main body 2, by adjusting the amount of current supplied to the coils 43A and 43B,
A desired braking force can be applied to the rotating shaft 4 of the viscometer main body 2.

FIG. 2 shows the configuration of a variable current type DC power supply 44, and a transformer 51 has a commercial power supply 50 of AC 100V.
A and the power output of 50B are received by the primary coil 51A, which is transformed in the secondary coil 51B.
Output to The rectifier 52 converts the AC output from the transformer 51 into DC and outputs the DC output to the regulator 53.
The regulator 53 sends the DC power output from the first output terminal to the switch circuit 54. The switch circuit 54 has three switching output terminals 54A, 54B and 54C, and the fixed output resistors 54A to 54C are respectively connected to semi-fixed resistors R1, R2 and R3 having different resistance values.

Accordingly, by switching the switch circuit 54, the DC power output from the regulator 53 is supplied to the coil 43B via the semi-fixed resistor R1, R2 or R3.
And 43A. A part of the output of the regulator 53 is directly input to the coil 43B, so that the current flowing through the coils 43B and 43A can be stabilized. Coil 4
3A and 43B are connected in series, respectively, and can generate a magnetic field according to the amount of current supplied to the coils 43B and 43A. Therefore, by switching the switch circuit 54 to any one of the three switching output terminals 54A to 54C, the current value of the DC power supply output to the coils 43A and 43B can be switched, and the resulting coils 43A and 43B are switched. Thus, the intensity of the magnetic field generated can be switched.

Thus, by switching the intensity of the magnetic field generated by the coils 43A and 43B, the braking force applied to the rotating plate 37 (FIG. 1) can be switched. According to the actual experiment, as shown in FIG. 3, the current I shown on the horizontal axis is changed by the coils 43A and 43B.
In this case, a braking force having substantially the same magnitude as when the rotor 3 was rotated in the calibration standard solution having the viscosity shown on the vertical axis could be applied to the rotating shaft 4 of the viscometer main body 2.

In the case of the embodiment, the conductive wire has a core diameter of 0.36.
[Mm] polyurethane-coated copper wire, and the polyurethane-coated copper wire is wound around each of the iron cores 41A and 41B having a diameter of 20 [mm] 3,000 times in layers to form a coil 4.
3A and 43B are formed. At this time, iron core 41A
And 41B are respectively attached to the yoke 40 so as to face each other with a gap of 2 [mm] therebetween.
7 is made of aluminum having a diameter of 100 [mm] and a thickness of 1 [mm].

In the above configuration, the operator previously measures the braking force applied to the rotating plate 37 when the switch circuit 54 of the variable current type DC power supply 44 is switched to select the semi-fixed resistor R1, R2 or R3. The rotational viscometer 1 (FIG. 11) is calibrated using the measured known load data. That is, when the rotational viscometer 1 is calibrated using the calibrating device 20, the rotational axis 4 of the viscometer main body 2 to be calibrated is used.
The engaging portion 34A formed on the shaft member 34 of the calibrating device 20 is engaged with the screw 4A formed on the rotating device 37 so that the braking force applied to the rotating plate 37 is transmitted to the rotating shaft 4.

In this state, the operator switches the switch circuit 54 (FIG. 2) of the variable current type DC power supply 44 to select the braking force applied to the rotating plate 37 and to change the rotating shaft 4 of the viscometer main body 2. Rotate. At this time, the rotational viscometer 1 is rotated to rotate the rotational viscometer 1 so that the load data (that is, the viscosity data) measured by the rotational viscometer 1 matches the known load data. Calibrate. Here, the intensity of the magnetic field generated between the iron cores 41A and 41B (FIG. 1) around which the coils 43A and 43B are wound changes immediately when the operator switches the switch circuit 54, thereby switching the switch circuit 54. Immediately after that, the calibration work can be started.

When the first calibration is completed, the operator switches the switch circuit 54 to select the second semi-fixed resistor. At this time, the value of the current flowing through the coils 43A and 43B changes, so that the braking force applied to the rotating plate 37 changes. At this time, the braking force applied to the rotating plate 37 is also measured in advance in the same manner as in the above case.
The rotational viscometer 1 is calibrated so that the result measured by the rotational viscometer 1 matches known load data. When the second calibration is completed, the operator operates the switch circuit 5
4 to select the third semi-fixed resistor. At this time, the value of the current flowing through the coils 43A and 43B changes, so that the braking force applied to the rotating plate 37 changes. At this time, since the braking force applied to the rotating plate 37 is also measured in advance in the same manner as described above, the rotating viscometer 1 is controlled so that the result measured by the rotating viscometer 1 matches the known load data. Calibrate.

As described above, the operator operates the switch circuit 54.
The braking force applied to the rotating plate 37 can be changed to a known value that has been set in advance simply by switching. Therefore, the work of calibrating the rotational viscometer 1 by applying various loads to the rotating shaft 4 of the rotational viscometer 1 requires complicated work such as replacing the calibration liquid having various viscosities. This can be further simplified as compared with the conventional case.

According to the above configuration, the rotary plate 37 that engages with the rotary shaft 4 of the rotary viscometer 1 and the DC magnetic flux generator 22 that generates a magnetic field crossing the rotary plate 37 are provided. By changing the magnitude of the magnetic field generated by the DC magnetic flux generating section 22, the rotational viscometer 1
Thus, it is possible to provide a calibrating device that can apply a braking force of a desired magnitude to the rotating shaft of the present invention and thus can greatly simplify the calibration work.

In the calibration device 20, the calibration liquid 1
The cost of the calibration device can be reduced by eliminating the equipment and the like necessary for the management of the thermostat 4, and the thermostat 11 (FIG. 11)
Thus, the time required for the temperature of the standard solution for calibration of the viscometer to stabilize and the time for replacing the rotor 3 become unnecessary, so that the time required for the calibration work can be shortened.

Furthermore, there is no risk of a measurement error occurring due to outflow of the viscometer calibration standard solution or mixing of water with the viscometer calibration standard solution. It is possible to realize a significantly more convenient calibration device, such as easy installation.

(2) Second Embodiment FIGS. 4 and 5 showing parts corresponding to those in FIG.
Shows a calibration device 60 according to a second embodiment of the present invention, in which an eddy current is generated in the rotating plate 37 using a permanent magnet. That is, in the calibration device 60, the rotating portion 21 is disposed at the center of the base member 61 formed in a plate shape, and the magnet support member formed in the column shape of the magnetic flux generation portion 62 at one end of the base member 61. A mounting base 63 is provided.

In the magnet support member mounting base 63,
A screw hole 63A is formed in the upper surface.
A screw 65 is screwed to A through a magnet support member 64 made of an iron material having a U-shaped cross section so that the magnet support member 64 can be attached in a fixed state. In this case, the upper side 64A and the lower side 64B of the magnet support member 64
Are provided with disc-shaped magnets 66A and 66B, respectively, so as to face the upper or lower surface of the rotating plate 37 with a gap therebetween.

Therefore, in the calibration device 60, the magnet 66A
From the magnet 66B to the magnet 66B or from the magnet 66B to the magnet 6B.
6A, a magnetic field is generated in the direction toward
When the rotor rotates, an eddy current is generated in the rotating plate 37 to apply a magnetic force to the magnets 66A and 66B and a braking force according to the mounting position.

In the above configuration, when calibrating the rotational viscometer 1 using the calibrating device 60, the engaging portion 34A of the shaft member 34 is hooked on the screw 4A of the rotating shaft 4 of the rotational viscometer 1. After setting the rotational viscometer 1 to be calibrated, the rotational plate 37 is rotated by rotating the rotary shaft 4 of the rotational viscometer 1 in the measurement mode. In this case, an eddy current having a magnitude corresponding to the magnitude of the magnetic force and the mounting position (moment) of the magnets 66A and 66B is generated on the rotating plate 37 from the magnetic field formed by the magnets 66A and 66B. A braking force corresponding to the magnitude of the eddy current is applied to the rotating plate 37.

Accordingly, in the calibration device 60, a braking force of a desired magnitude is applied to the rotating shaft 4 of the rotational viscometer 1 by selecting the magnetic force and the mounting position of the magnets 66A and 66B. Accordingly, the viscosity of the rotational viscometer 1 can be calibrated based on the braking force.

According to the above configuration, the eddy current is generated in the rotary plate 37 of the rotary unit 21 using the permanent magnets 66A and 66B, so that the rotation of the calibration target is performed via the rotary plate 37 and the shaft member 34. By applying a braking force to the viscometer 1, the calibration device can be constructed with a cheaper and simpler configuration than the calibration device 20 of the first embodiment.

(3) Third Embodiment FIGS. 6 and 7 show parts corresponding to those in FIGS. 4 and 5 with the same reference numerals appended with a suffix X or Y. FIGS.
0, the rotating portion 21 is provided at the center of the base member 71 formed in a plate shape. At both ends of the base member 71, columnar magnet support member mounting bases 73A and 73B of the magnetic field generators 72A and 72B are provided. Screw holes 73AX, 73AY, and 73AZ are sequentially formed in the upper surface of the magnet support member mounting base 73A in a direction from the center of the base member 71 to the outside, and similarly to the upper surface of the magnet support member mounting base 73B. Screw holes 73BX, 73BY, 73BZ are sequentially formed in the direction from the center of the base member 71 to the outside.

In the above configuration, in the calibration device 70, the screw holes 73AX through 73X into which the screws 65X or 65Y are screwed.
By changing 73AZ or 73BX to 73BZ, the moment of the braking force applied to the rotating plate 37 by the magnets 66AX and 66BX or 66AY and 66BY can be changed, whereby the braking force in 9 (3 × 3) steps as a whole is obtained. Can be given to the rotating shaft 4 of the rotational viscometer 1 to be calibrated.

According to the above-described structure, the magnetic field generating parts 72A and 72B are provided on both ends of the base member 71, respectively, and the upper surfaces of the magnet support member mounting bases 73A and 73B constituting the magnetic field generating parts 72A and 72B are provided. 7 screw holes
3AX-73AZ or 73BX-73BZ
By forming them one by one, 9
Calibration of the rotational viscometer 1 more accurately than in the second embodiment because a stepwise braking force can be applied to the rotating shaft 4 of the rotational viscometer 1 and thus can be calibrated based on a plurality of braking forces. A calibration device capable of performing the above can be realized.

(4) Other Embodiments In the first, second and third embodiments, the rotating plate 37 is made of aluminum having a diameter of 100 [mm] and a thickness of 1 [mm]. Although the case has been described, the present invention is not limited to this, and various other sizes and materials can be applied as long as the rotating plate 37 is formed of a conductive material.

In the first embodiment, a polyurethane-coated copper wire having a core diameter of 0.36 [mm] is used as the conductive wire, and the polyurethane-coated copper wire is attached to each of the iron cores 41A and 41B having a diameter of 20 [mm]. Although the case where the coils 43A and 43B are formed by winding 3,000 times in layers is described, the present invention is not limited to this, and the conductive wires formed of other various materials may be used. Applicable, and the core diameter of the conducting wire and the iron cores 41A and 41
As the diameter of B, various other values can be applied.

Further, in the first embodiment described above, the case where the DC constant current power supply 44 is configured as shown in FIG. 2 has been described. However, the present invention is not limited to this. As long as the amount can be changed in a plurality of stages, the DC constant current power supply 44 may have another configuration.

Further, in the above-described second embodiment, a case has been described in which only one screw hole 63A is formed on the upper surface of the magnet support member mounting base 63. However, the present invention is not limited to this. Screw hole 63A as in the third embodiment
May be formed two or more.

Further, in the above-described second embodiment, a case has been described in which the calibration device 60 is formed by using only one set of the magnetic flux generator 62. However, the present invention is not limited to this, and for example, Two sets of the magnetic flux generators 62 as in the third embodiment,
Alternatively, a calibration device may be formed using more than that.

Further, in the third embodiment, the screw holes 7 are formed on the upper surfaces of the magnet support member mounting bases 73A and 73B.
3AX-73AZ or 73BX-73BZ
Although the case where the holes are drilled one by one has been described, the present invention is not limited to this, and the screw holes 73AX to 73AZ or 73
The number of BX to 73BZ may be another value.

Further, in the third embodiment described above, the case where the calibration device 70 is formed by using the magnetic flux generating units 72A and 72B has been described. However, the present invention is not limited to this, and for example, the second embodiment As in the embodiment, a calibration device may be formed by using one set of the magnetic flux generating units 72A or 72B, or a calibration device may be formed by using three or more magnetic flux generating units 72A and 72B. .

Further, in the above-described second and third embodiments, the case where the disk-shaped magnets 66A and 66B are used has been described. However, the present invention is not limited to this, and the magnets 66A and 66B may be used. Other shapes may be used. In this case, for example, as shown in FIG.
A magnet having a magnet as a pole integrally attached thereto may be used. Alternatively, for example, as shown in FIG. 9, a magnet support member and a magnet may be integrally formed. Further, in this case, as shown in FIG.
A magnet with separate poles may be used.

[0045]

Further, in the above-described first to third embodiments, the case where the rotating plate 37 is formed in a disk shape has been described. However, the present invention is not limited to this, and other shapes are applicable. Is also good.

[0047]

As described above, according to the present invention, in a calibrating apparatus used for calibrating a rotational viscometer, when a rotor attached to a rotating shaft is rotated in a liquid to be measured for viscosity, the rotor is moved to the above-mentioned position. A calibration device used for calibrating a rotational viscometer that measures the viscosity of a liquid based on a braking force received from the liquid. And a magnetic field generating means for generating a DC magnetic field intersecting with the rotating body, so that a desired magnitude of braking force can be applied to the rotating shaft of the rotational viscometer. In this way, the calibration work of the rotational viscometer can be performed without using the calibration liquid, and thus a significantly more convenient calibration apparatus can be realized.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an overall configuration of a calibration device according to a first embodiment.

FIG. 2 is a block diagram showing a variable current type DC power supply.

FIG. 3 is a characteristic diagram showing a relationship between a braking force generated by a current flowing through a coil and a braking force generated by the viscosity of a standard solution for viscometer calibration.

FIG. 4 is a top view showing the overall configuration of a calibration device according to a second embodiment.

FIG. 5 is a partial cross-sectional view illustrating an entire configuration of a calibration device according to a second embodiment.

FIG. 6 is a top view showing the overall configuration of a calibration device according to a third embodiment.

FIG. 7 is a partial cross-sectional view showing the entire configuration of a calibration device according to a third embodiment.

FIG. 8 is a side view showing another embodiment.

FIG. 9 is a side view showing another embodiment.

FIG. 10 is a side view showing another embodiment.

FIG. 11 is a side view showing a partial cross section of a conventional calibration device.

[Explanation of symbols]

1 ... rotational viscometer, 2 ... viscometer main body, 3 ... rotor, 4 ... rotating shaft, 4A ... screw, 10, 20, 60,
70 calibration device, 11 thermostatic bath, 14 calibration liquid, 21 rotating unit, 22 braking means (DC magnetic flux generating unit), 34 shaft member, 34A engagement unit, 37 rotating members (rotating plates), 41A, 41B magnetic field generating means (iron core), 43A, 43B magnetic field generating means (coils), 44 magnetic field generating means (variable current type DC power supply),
62, 72A, 72B ... braking means (magnetic flux generating part), 6
3, 73A, 73B ... magnet support member mounting base, 63
A, 73AX to 73AZ, 73BX to 73BZ ... screw holes, 64, 64X, 64Y ... magnet support members, 71A to
71C: Screw hole, 65: Screw, 66A, 66B, 6
6AX, 66AY, 66BX, 66BY ... Magnetic field generating means (magnet).

Claims (1)

(57) [Claims] 1. A method for calibrating a rotational viscometer for measuring a viscosity of a liquid based on a braking force received from the liquid when the rotor attached to the rotating shaft is rotated in the liquid whose viscosity is to be measured. In the calibration device used, the rotating viscometer is engaged with the rotating shaft, and
A rotating body made of a conductive material that rotates on a body, and a magnetic field that generates a DC magnetic field that crosses the rotating body.
Calibration apparatus characterized by comprising a generating means.