KR200275532Y1 - A rotary type viscometer using rotating torque - Google Patents

Abstract

The present invention measures the contact resistance generated when rotating a sample under test in a liquid or semi-solid state with a rotating rod, and converts the measured torque value into a viscosity to measure the viscosity of the sample under test. It relates to a rotary viscometer.

The rotary viscometer using the rotary torque of the present invention includes a drive motor 3 for generating a rotational driving force, a support bracket 5 for supporting the motor 3 on a container 10 containing a sample 11 to be measured, and In the rotary viscometer (1) consisting of a rotating rod (9) connected to the rotating shaft (13) and the coupling (15) of the drive motor (3) so as to rotate in a locked state to the sample to be measured (11). Is installed between the drive motor (3) and the support bracket (5) is to detect the relative amount of rotation of the motor (3) relative to the bracket (5) to measure the torque applied to the rotating rod (9) A torque cell 51 is provided.

Therefore, according to the rotary viscometer using the rotational torque of the present invention, the viscosity of the sample is measured by measuring the strain value applied to the torsion bar of the torque cell with the drive motor due to the contact resistance of the sample to be measured on the rotational axis of the drive motor. Therefore, it is possible to use at low volume, and it is possible to make precise viscosity measurement at any time according to the temperature change.

Description

A rotary type viscometer using rotating torque

The present invention relates to a rotary viscometer, and more particularly, to measure the contact resistance generated when rotating a sample in a container with a rotating rod in order to measure the viscosity of an object in a liquid or semi-solid state, and converts the measured torque value into a viscosity. It relates to a rotary viscometer using a rotating torque to be converted.

Until now, a technique of measuring the viscosity of a sample by a rotary viscometer has been described in which the motor 105 rotates using the flow sensor 103 as shown in FIG. 1 to detect the torque according to the contact resistance of the rotating rod. When the motor 205 rotates by measuring the electromotive force which varies according to the magnitude of the contact resistance between the rotating rod 103 and the sample 109 to be measured or by using a torque meter 203 as shown in FIG. The torque change value has been used in terms of the measured viscosity according to the contact resistance magnitude between 207 and the sample 209 to be measured.

That is, in the case of the viscometer 101 illustrated in FIG. 1, when the motor 105 is rotated and driven, the coupling 107 is also rotated to rotate the rotating rod 111 connected to the coupling 107, and the container 113 is rotated. Contact resistance occurs due to friction between the sample 109 and the circumferential surface of the rotating rod 111 contained therein. According to the magnitude of the contact resistance, the change in the electromotive force of the motor is detected by the Hall sensor 103 and detected as a DC microvoltage signal, and the amplifier and the A / D converter 115 amplify and convert the microanalog signal into a digital signal, and then By the calculation of the computer 117, it displays on the digital display window 119 as a viscosity value. At this time, the rotational speed of the motor 105 is adjusted using a volume or digital motor controller 121, and the speed at the time of adjustment can be monitored on the digital display window 119.

In the case of the viscometer 201 shown in FIG. 2, when the motor 205 is rotated, the torque meter 203 connected to the coupling 211 and the rotating rod 207 connected by another coupling 213 to the lower portion thereof are connected. As a result, contact resistance is applied to the rotating rod 207 due to friction between the sample 209 and the rotating rod 207 circumferential surface contained in the container 215. At this time, the contact resistance is detected as the magnitude of the torque in the torque meter 203, and the small voltage signal detected by the torque meter 203 is amplified by the amplifier and the A / D converter 215 and converted into a digital signal. Calculated by the microcomputer 217 and displayed as a viscosity value through the display window 219, at this time, the rotational speed of the motor 205 is made by the motor controller 221 like the viscometer 101 of FIG.

However, since the conventional viscometer 101 as shown in FIG. 1 is configured to detect the electromotive force change of the motor 105 by the hall sensor 103, the temperature of the motor 105 or the surrounding environment such as supply power or humidity. Not only a large number of measurement errors occur depending on the rotational speed of the motor 105, but also the feedback control is not accurate control has been a problem. In addition, in the case of the viscometer 201 shown in FIG. 2, it is difficult to manufacture the torque meter 203 in low capacity due to its structure, and thus it is impossible to use the low capacity, and the apparatus becomes large in size, and therefore, there is a problem in that the price is high.

Therefore, the present invention has been proposed to solve the problems of the conventional viscometer, and measures the strain value applied to the torsion bar by the strain gauge attached to the torsion bar side of the torque cell mounted between the motor and the bracket, By measuring the viscosity of the sample under measurement using this value, the viscosity of the sample can be measured regardless of the capacity from the high capacity to the low capacity, and the motor that changes in the viscosity measurement due to the heating state, the ambient humidity, the fluctuation of the main power, etc. The purpose is to enable accurate viscosity measurement by avoiding the electromotive force of.

1 is a longitudinal sectional view schematically showing a conventional rotary viscometer.

Figure 2 is a longitudinal sectional view schematically showing another conventional rotary viscometer.

Figure 3 is a longitudinal sectional view schematically showing a rotary viscometer according to the present invention.

4 is a detailed longitudinal cross-sectional view of the torque cell shown in FIG. 3 along line BB of FIG. 5;

5 is a cross-sectional view taken along line AA of FIG. 4.

6 is a circuit diagram showing a configuration of a Wheatstone bridge for detecting the output voltage of the strain gauge.

* Explanation of Signs of Major Parts of Drawings *

1: rotary viscometer 3: servo motor

5: support bracket 7: control unit

9: rotating rod 11: sample to be measured

13: rotating shaft 15: coupling

17: mounting plate 19: temperature sensor

21: friction plate 23: support bearing

25: through opening 31-38: strain gauge

51: torque cell 53,55: upper and lower ring body

57: torsion bar

In order to achieve the above object, the present invention provides a drive motor for generating a rotational drive force, a support bracket for supporting the drive motor on a container containing a sample to be measured, and a sample to be measured connected through a coupling with a rotation shaft of the drive motor. A rotary viscometer consisting of a rotating rod configured to rotate in a locked state, comprising: a torque cell provided between a drive motor and a support bracket to detect a relative rotational amount of a motor relative to a bracket to measure torque applied to the rotating rod. It provides a rotary viscometer using a rotating torque.

Hereinafter, a rotary viscometer using a rotary torque according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The rotary viscometer of the present invention, as shown by reference numeral 1 in FIG. 3, is basically the same as the general rotary viscometer for the driving servo motor 3, that is, the driving motor 3, the rotating rod 9, and the support bracket ( 5) and the like, and in particular, a torque cell 51 as shown in FIGS. 4 and 5 is mounted between the drive motor 3 and the support bracket 5.

Here, the drive motor 3 is fixed to the torque cell 51 via the mounting plate 17, and the mounting plate 17 is circumferentially to the upper flange portion 54 of the upper ring body 53 of the torque cell 51. It is fixed on the upper ring body 53 by bolts 59 coupled to a plurality of threaded holes 61 formed therethrough, the rotational speed is controlled by the drive motor controller 73 of the control unit 7, the adjacent encoder The number of rotations encoded by 20 is transmitted to the encoder counter 75 of the control unit 7.

The rotary rod 9, which is integrally coupled to the lower end of the rotation shaft 13 of the driving motor 3 penetrating the center of the mounting plate 17 through the coupling 15, is supported by the support bracket 23 through the support bracket 5. ) Is rotated by the rotational driving force of the drive motor (3) in a state of being inserted into the penetrating member and locked to the sample to be measured 11 inside the container (10) located below the support bracket (5). 11) The friction plate 21 is attached to the part which is immersed in the inside to maintain the contact resistance with the sample 11 above a predetermined value.

In this way, the torque cell 51 configured to measure the torque applied between the rotation rod 9 and the support bracket 5 between the drive motor 3 and the support bracket 5 may control the measured torque value of the analog type. 7) and then amplified by the amplifier 77, and then converted to a digital value by the A / D converter 79 to be processed by the microcomputer 71, as shown in Figure 3, the support bracket ( It is fixed to the support bracket 5 by the bolt 65 inserted into the flange part 56 of the lower ring body 55 through the screw hole 63 in the state inserted in 5).

As described above, the torque cell 51 installed on the support bracket 5 includes a plurality of torsion bars connected between the upper and lower ring bodies 53 and 55 and the upper and lower ring bodies 53 and 55. (57) and a plurality of strain gauges (31, 32, 33, 34, 35, 36, 37, 38) attached to the side of the torsion bar (57), wherein the upper and lower ring bodies (53) are shown As shown, the flange portions 54 and 56 are protruded from the outer circumferential surface, respectively, and the plurality of threaded holes 61 and 63 for fastening the bolts 59 and 65 to each of the flange portions 54 and 56 pass through, respectively. In particular, in the case of the lower ring body 53, the seating protrusion 67 protrudes from the flange portion 56 by the thickness of the support bracket 5 to the through opening 25 formed in the support bracket 5. It is supposed to fit.

The plurality of torsion bars 57 connecting the upper and lower ring bodies 53 and 55 in the middle are integrally formed so as to have axis symmetry between the two ring bodies 53 and 55, and as illustrated, a plurality of strain gauges ( 31, 32, 33, 34, 35, 36, 37, 38, each gauge is attached to the upper and lower sides of the torsion bar 57, for example, as shown in Figure 4 to the upper with respect to the lower ring body 55 When the ring body 53 rotates in the counterclockwise direction, the upper gauges 31, 33, 35, and 37 as shown in Fig. 4 tension the torsion bar 57, and the lower gauges 32, 34, 36, 38 as shown in FIG. Are each configured to sense the compression of the torsion bar 57. Each gauge is also connected with a Wheatstone bridge as shown in FIG. 6 to detect the output voltage as a resistance change with respect to the input voltage. The Wheatstone bridge circuit is configured such that the gauges in the diagonal direction are connected in series.

In addition, the temperature sensor 19 immersed in the sample 11 in the container 10 to measure the temperature of the sample 11 to be measured, as shown in FIG. The temperature value transmitted to the control unit 7 is amplified by the amplifier 80 of the control unit 7, and then converted to a digital value through the A / D converter 81, and then to the microcomputer 71 Is processed by

In addition, the control unit 7 is connected to the digital display window 83 or the PC 85 through the microcomputer 71 as shown in FIG. 3, the printer 86 or the monitor ( 87) is connected.

Now, the operation of the rotary viscometer 1 using the rotary torque according to the embodiment of the present invention configured as described above is as follows.

The rotary viscometer 1 of the present invention has a lower ring body 55 of the torque cell 51 fixed to the support bracket 5 when a rotating load is applied to the rotating shaft 13 of the drive motor 3 through the rotating rod 9. ) And a viscometer using the principle that the torsion bar 57 attached between the upper ring body 53 holding the driving motor 3 to rotate relative to the lower ring body 55 is rotated. The viscosity of the sample 11 is measured by measuring the torque corresponding to the frictional resistance of the sample 11 causing contact resistance.

Therefore, in order to measure the viscosity of the sample 11 by the rotary viscometer 1, the drive motor 3 is first operated in the state which installed the viscometer 1 as shown in FIG. Accordingly, the rotational driving force generated by the driving motor 3 is transmitted to the rotating rod 9 sequentially through the motor rotating shaft 13 and the coupling 15. At this time, if the rotating rod 9 is no load, the bracket 5 is applied. No reaction force is applied to the torque cell 51 which is fixed at the same. However, when the motor 3 is operated while the rotating rod 9 is immersed in the sample 11 contained in the container 10, the sample to be measured ( A frictional resistance is generated between 11) and the friction plate 21 of the rotating rod 9, and this frictional resistance becomes a reaction force and is detected by the torque cell 51 as a small voltage signal. At this time, when the eccentric load acts on the torque cell 51, the Wheatstone bridge of FIG. 6 detects the voltage deviation generated by each gauge due to the unbalanced load and corrects it through the controller 7.

The analog micro-signals detected in this way are fast amplified by the amplifier 77, converted into digital signals by the A / D converter 79, and transmitted to the microcomputer 71, which are transmitted to the microcomputer 71. The digital voltage signal value can be displayed through the monitor 87 or the printer 86 through the PC 85 as an interface or output as written data, and can be permanently preserved. Can be used.

On the other hand, in the viscosity measurement by the viscometer (1) is accompanied by the rotational speed control, once the speed (rpm) commanded from the motor controller 73, the drive motor (3) is operated to rotate the rotating shaft (13) at the speed Rotated). At this time, the rotational speed value can be obtained through the encoder counter 75 of the encoder 20 and the control unit 7, and the constant speed can be maintained by comparing the speed value initially commanded by the microcomputer 71 with PID control. Will be.

In addition, since the temperature of the sample 11 under test is also an important factor of viscosity measurement, the micro-analog temperature signal value of the sample under test in the container 10 measured by the temperature sensor 19 is amplified by the amplifier 80. And converted to a digital value by the A / D converter 81, and then transmitted to the microcomputer 71 of the controller 7. The transmitted temperature value can be displayed as a graph indicating the relationship between temperature and viscosity through the monitor () or printer () via the PC (85) to the microcomputer (71) or permanently preserved as written data. 85 may be stored and analyzed.

According to the rotary viscometer using the rotary torque according to the present invention as described above, it is possible to accurately measure the viscosity of physical properties in the fields of petrochemical, food, medicine, polymer, etc., and to store and analyze the measured viscosity value data In addition, it is possible to monitor, as well as to measure the viscosity during the product manufacturing process or post-production inspection process, particularly convenient for measuring the viscosity of high viscosity products.

Claims (3)

A drive motor 3 for generating a rotational drive force, a support bracket 5 for supporting the motor 3 on a container 10 containing a sample 11 to be measured, and a rotation shaft 13 of the drive motor 3; And a rotating rod (9) connected to the coupling rod (15) so as to rotate in a locked state to the sample to be measured (11) and the driving motor (3), and the torque value measured through the rotating rod (9). In the rotary viscometer (1) consisting of a control unit 7 for processing the Torque installed between the drive motor (3) and the support bracket (5) to detect the relative amount of rotation of the motor (3) relative to the bracket (5) to measure the torque applied to the rotating rod (9) Rotary viscometer using a rotary torque, characterized in that the cell 51 is provided. According to claim 1, The torque cell 51 has an upper ring body 53 to which the motor 3 is fixed through the mounting plate 17, and a lower ring body fixed to the support bracket 5 so as to correspond to the upper ring body 53. 55), a plurality of torsion bars 57 axially attached between the upper ring body 53 and the lower ring body 55, and the torsion bar 57 side to measure the torsional deformation of the torsion bar 57. A rotary viscometer using a rotating torque, characterized in that it comprises a plurality of strain gauges (31, 32, 33, 34, 35, 36, 37, 38) attached thereto. According to claim 1, A temperature sensor which is immersed in the sample 11 in the container 10 while connected to the control unit 7 to measure the temperature of the sample 11 and transmits the measured temperature value to the control unit 7 ( Rotary viscometer using a rotary torque, characterized in that it further comprises 19).