KR101898607B1 - Absoulute viscometer of asphalt - Google Patents

Abstract

The present invention relates to an absolute viscometer of asphalt, and specifically relates to the absolute viscometer of asphalt, comprising: a case forming an outer appearance and formed with an inner space; an isothermal oil tank arranged in the inner space of the case and accommodating a temperature maintaining medium; a capillary tube shaped viscometer arranged to be partially immersed into the temperature maintaining medium of the isothermal oil tank, and having an asphalt specimen flowing in a direction opposite from the gravity by vacuum supplied from one side thereof; and a vacuum supplying portion supplying the vacuum to the capillary tube shaped viscometer, thereby capable of remarkably improving a reliability in measurement.

Description

Asphalt absolute viscometer {ABSOULUTE VISCOMETER OF ASPHALT}

The present invention relates to an asphalt absolute viscometer, and more particularly, to an asphalt absolute viscometer capable of improving the reliability of measurement.

In general, methods and apparatuses for measuring the viscosity or viscosity of a fluid are well known.

For example, in the case of an apparatus or method for measuring the viscosity of a Newtonian fluid in which the relationship between the shear stress and strain of a fluid satisfies Newton's law, viscosity measurement is not complicated and can be measured using various methods and apparatuses .

In addition, many non-Newtonian fluids have been proposed that can measure viscosity easily and easily even if the relationship between shear stress and strain is not constant.

There are many kinds of viscometers for measuring fluids and colloids, and the Ostwald viscometer, which is used as the simplest principle, is widely used.

This Ostwald viscometer measures the viscosity of a sample solution under the influence of gravity by measuring the time when the sample solution flows through two points through a vertical capillary.

That is, after a predetermined amount of sample solution is injected into a vertically erected capillary, and the sample solution in the viscometer tube is maintained at a predetermined temperature, the time of the sample solution dropping between two points of the viscometer tube is measured, And the relative viscosity of the sample solution is determined by comparing the time of inhalation of the solvent measured under the same conditions as that of the dropping time.

The absolute viscosity and the intrinsic viscosity of the sample solution are determined based on the relative viscosity thus obtained and the concentration of the sample solution.

However, since the prior art relative viscometer is a method of performing viscosity measurement through a plurality of processes, a considerable skill is required for viscosity measurement, and on the other hand, it is disadvantageous in terms of cost because of its complicated structure. Under the influence of gravity There is a problem in that the reliability of the measurement deteriorates due to the fact that the measurement value varies depending on the measurement environment in that the absolute viscosity is derived after measuring the relative viscosity.

Korean Patent No. 10-0747605 (2007.08.08. Announcement)

Disclosure of the Invention The present invention has been conceived to solve the above-described problems, and it is an object of the present invention to provide a method of measuring asphalt absolute viscosity through a single process so as to improve the reliability of measurement, And an object of the present invention is to provide an asphalt absolute viscometer capable of improving the durability by protecting the vacuum supply portion.

An asphalt absolute viscometer according to an embodiment of the present invention includes a case having an outer space and formed with an inner space, a thermostatic chamber disposed in an inner space of the case and containing a temperature maintaining medium, A capillary viscometer disposed so as to be submerged and adapted to flow the asphalt sample in a direction opposite to the gravitational direction by a vacuum supplied from one side, and a vacuum supply unit for supplying the vacuum to the capillary viscometer.

Here, the heater may further include at least one sheath heater arranged inside the thermostatic oil bath and heating the temperature maintaining medium.

The apparatus may further include at least one temperature sensor for measuring a temperature of the temperature-maintaining medium in the thermostatic oil bath, and a water level sensor for sensing a water level of the temperature-maintaining medium in the thermostatic oil bath.

In addition, the at least one temperature sensor may be installed at a predetermined position inside the thermostatic oil tank, and may be located at 1/3 and 2/3 of the height of the thermostatic oil tank.

Further, an agitator for agitating the temperature-maintaining medium of the thermostatic oil bath; As shown in FIG.

The capillary viscometer, a plurality of vacuum connection pipes connected to the vacuum supply unit to supply a vacuum to the capillary viscometer, and a temperature sensor, an installation of the level sensor and the stirrer, An upper frame may be provided.

The vacuum supply unit may include a vacuum tank provided on the lower side of the thermostatic oil tank in the inner space of the case, a diaphragm provided on one side of the thermostatic oil tank in the inner space of the case, A vacuum connection pipe connecting the pump, the vacuum tank and the capillary viscometer, and an air discharge pipe connected to the operation of the diaphragm pump for discharging air in the vacuum tank and an air supply pipe for sucking air into the vacuum tank .

The vacuum supply unit may further include a toggle valve provided on the vacuum connection pipe and interrupting an air flow of the vacuum connection pipe for supplying vacuum to the capillary viscometer.

The vacuum supply unit may further include a vacuum filter provided on the vacuum connection pipe to filter foreign substances in the air flowing from the capillary viscometer.

Also, the thermostatic oil bath may be made of a transparent tempered glass material whose inside is observed from the outside.

The fixing case is fixed to the inner space of the case, and is fixed to the outer side and the outer side of the fixing case. The fixing case is provided with a predetermined light toward the thermostat, And may further include a pair of LED modules to be examined.

The apparatus may further include an opening / closing door provided at a front portion of the case and opening / closing the front of the opening of the fixing case.

According to the embodiment of the asphalt absolute viscometer according to the present invention, the absolute viscosity of the asphalt sample can be more accurately measured by keeping the temperature of the temperature-maintaining medium in the thermostatic oil tank constant at all times, and the foreign matter in the air, So that the durability of the vacuum supply part can be improved.

1 is a perspective view showing an embodiment of an asphalt absolute viscometer according to the present invention,
FIG. 2 is an exploded perspective view of the structure of FIG. 1,
FIG. 3A and FIG. 3B are a downward perspective view and an upward perspective view showing a vacuum supply unit and a stirrer provided on the upper portion of the constant temperature oil tank of FIG. 1,
FIG. 4 is a side view showing a vacuum supply unit provided at one side of the constant temperature oil tank in the configuration of FIG. 1,
5 is a side cross-sectional view showing an agitator in the configuration of FIG. 1,
FIG. 6 is a perspective view of the stirrer of FIG. 5,
FIG. 7 is a partially cutaway perspective view taken along line AA in FIG. 1,
FIG. 8 is a side view showing a capillary-type viscometer in the configuration of FIG. 1; FIG.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals even though they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. Also, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

Throughout the specification, when an element is referred to as being "comprising" or "comprising", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise .

FIG. 1 is a perspective view showing an embodiment of an asphalt absolute viscometer according to the present invention, FIG. 2 is an exploded perspective view of the structure of FIG. 1 except for the outer case, FIG. 4 is a side view showing a vacuum supply unit provided at one side of the constant temperature oil tank in the configuration of FIG. 1; FIG. 4 is a perspective view of the vacuum supply unit and the stirrer of FIG.

1 to 4, an asphalt absolute viscometer 1 according to an embodiment of the present invention includes a case 10 having an outer space and an inner space formed therein, And a capillary tube (5) which is disposed so as to be partially submerged in the temperature maintenance medium of the thermostatic oil bath (5) and in which the asphalt sample flows in a direction opposite to the direction of gravity by a vacuum supplied from one side Type viscometer 40 and a vacuum supply unit 60 for supplying a vacuum to the capillary viscometer 40. [

The case 10 is formed in a substantially rectangular parallelepiped shape and an internal space in which the thermostat oil bath 5 and the vacuum supply unit 60 are provided may be formed therein.

A vacuum tank 61 may be provided below the inner space of the case 10 and a thermostatic bath 5 may be provided above the vacuum tank 61. The thermostatic oil bath 5 can be stably installed in the inner space of the case 10 via the fixed case 11 provided on the upper side of the vacuum tank 61.

2, the stationary case 11 includes a stationary portion 12 on which the thermostatic oil tank 5 is seated, a stationary wall portion 13 arranged vertically and vertically along the rim of the stationary portion 12, ). The fixed case 11 can be formed by the fixed wall 13 so that the front and the top are opened as a whole. Hereinafter, for convenience of explanation, a portion opened frontward of the open portion of the fixed case 11 will be referred to as a 'front opening portion,' and a portion opened to the upper one of the opened portions of the fixed case 11 will be referred to as' Quot;

On the other hand, inside the thermostatic oil bath 5, a temperature-maintaining medium can be accommodated. The temperature maintenance medium serves to supply a predetermined heat to the capillary viscometer 40 so that the asphalt sample in the mucilage state to be measured can maintain a constant temperature.

The temperature-maintaining medium can be adopted as a silicon oil having a relatively low degree of polymerization, which is a silicon resin having a low freezing point and a small viscosity change with temperature. However, the temperature-maintaining medium is not limited to the silicone oil, and any material can be adopted as long as it is a medium of a material having little change due to heat provided from the sieve heater 100, which will be described later.

On the other hand, the front portion of the case 10 is formed so as to open forward as in the case of the front opening portion of the fixed case 11 described above, and the front end portion of the case 10, The opening / closing door 15 may be provided.

Here, the thermostatic oil bath 5 may be formed of a transparent tempered glass so that the inside can be observed from the outside. Therefore, after the case 10 is opened by using the above-described opening and closing door 15, the tester can measure the absolute viscosity through the capillary viscometer 40 provided so as to be partially immersed in the thermostatic bath 5 Can be visually confirmed.

A pair of LED modules 110 for irradiating a predetermined light toward the thermostatic bath 5 may be provided on the outer side and the outer side of the fixed wall 13 of the fixed case 11.

The pair of LED modules 110 are connected to a thermostat bath 5 in which light is placed inside the stationary case 11 through a guide slot 14 formed in a bar shape, As shown in FIG. Therefore, it is possible to more clearly confirm the process of measuring the absolute viscosity of the asphalt sample in the thermostatic oil reservoir 5 by the test person.

2 to 3B, the asphalt absolute viscometer according to one embodiment (1) of the present invention includes a medium heating unit disposed inside the thermostatic oil bath 5 for heating the temperature maintaining medium .

The medium heating unit may include a sheath heater 100 and may include a pair of sheath heaters 100 provided in a U-shape so that a lower end of the sheath heater 100 extends into the thermostatic oil bath 5. The medium heating unit serves to keep the temperature maintaining medium at a predetermined temperature by applying a predetermined heat to the temperature maintaining medium accommodated in the thermostatic oil tank 5.

To this end, one embodiment (1) of the asphalt absolute viscometer according to the present invention comprises at least one temperature sensor 90 for measuring the temperature of the temperature-maintaining medium in the thermostatic bath 5, As shown in FIG.

At least one temperature sensor 90 is provided at a predetermined position inside the thermostatic oil bath 5 so as to more accurately and reliably measure the temperature of the temperature maintaining medium in the thermostatic oil bath 5, (See reference numeral 90a in FIG. 3B) and 2/3 point (refer to 90b in FIG. 3B) with respect to the height of the thermostatic oil tank 5, as shown in FIG.

In the embodiment (1) of the present invention, two temperature sensors 90 are provided. However, the present invention is not limited to this, and the temperature of the temperature holding medium in the thermostatic oil bath 5 can be detected at various positions It is possible to provide three or more.

On the other hand, a control unit 30 may be provided on one side of the case 10. The control unit 30 includes a control panel 31 provided on one side of the front side of the case 10 and a plurality of operation buttons 32 and a plurality of operation buttons 32 provided on the control panel 31, And a display unit 33 for displaying an operating state of the asphalt absolute viscometer 1 according to an embodiment of the present invention. Various electric parts (not shown) may be installed on the rear portion of the control panel 31.

One embodiment (1) of the asphalt absolute viscometer according to the present invention may further comprise a level sensor 80 for sensing the level of the temperature maintenance medium in the thermostatic bath 5, as shown in FIG. 3A . The level level sensor 80 may be formed so that a portion for measuring the water level is extended downward so as to be immersed in the temperature holding medium in the thermostatic oil bath 5,

In addition, one embodiment (1) of the asphalt absolute viscometer according to the present invention may further include an agitator 50 for agitating the temperature-maintaining medium of the thermostatic oil bath 5. The stirrer 50 serves to stir the temperature-maintaining medium in the thermostatic bath 5 to uniformize the temperature of the temperature-maintaining medium throughout the thermostatic bath 5, thereby minimizing the spatial temperature deviation.

FIG. 5 is a side sectional view showing an agitator in the constitution of FIG. 1, and FIG. 6 is a perspective view showing the agitator of FIG.

5 and 6, the agitator 50 includes a drive motor 51 electrically driven to rotate, a drive motor 51 extending in the axial direction of the rotation shaft of the drive motor 51, And an impeller 53 provided at an end portion of the bar frame 52 to flow the temperature-maintaining medium.

The impeller 53 is positioned so as to be close to the center portion of the thermostatic oil bath 5 and rotated by the rotational force of the driving motor 51 so that the temperature maintaining medium can be circulated evenly throughout the thermostatic oil bath 5.

The capillary viscometer 40 described above, a plurality of vacuum connection pipes 65 described later, and the temperature sensor (not shown) are provided on the upper side of the thermostatic oil bath 5 to close the upper opening of the fixed case 11, 90, an upper frame 20 that mediates installation of the level sensor 80 and the stirrer 50 may be installed.

1, the upper frame 20 includes a front end frame provided at the front end of the side where the opening and closing door 15 is provided and constituting a part of the upper surface of the case 10, And a rear frame that is provided at the rear side and is hidden by the motor cases 57 and 10 described later. The front end frame is provided to be exposed to the outside, and may be made of an insulating material.

At least one viscometer mounting hole 25 for inserting the capillary viscometer 40 having at least one capillary viscometer 40 downward is provided in the upper frame 20 and a temperature sensor mounting hole A water level sensor installation hole (not shown) in which a water level sensor 80 is installed, a stirrer 50 installation hole 26 in which a stirrer 50 is installed, and a heater installation hole (27) may be respectively formed.

The capillary-type viscometer 40 is provided so that the lower end portion of the capillary-type viscometer 40, through which the sample whose absolute viscosity is to be measured, is immersed in the temperature-maintaining medium of the thermostat bath 5 through the viscometer mounting hole 25, (25) by means of a viscometer lid (41).

2 to 4, the vacuum supply unit 60 includes a vacuum tank 61 provided below the constant temperature oil tank 5 in the internal space of the case 10, A diaphragm pump 62 provided at one side of the constant temperature oil bath 5 for sucking and discharging the air in the vacuum tank 61 and a vacuum connection for connecting the vacuum tank 61 and the capillary viscometer 40 An air discharge pipe 64 for discharging the air in the vacuum tank 61 and an air suction pipe 63 for sucking air in the vacuum tank 61 in connection with the operation of the diaphragm pump 62 can do.

The vacuum supply unit 60 serves to generate and supply a vacuum through one side 40 of the capillary viscometer 40 partially immersed in the thermostatic bath 5. Accordingly, the vacuum connection pipe 65 may be provided to connect the capillary viscometer 40 with a vacuum tank 61 provided to substantially generate a vacuum.

Further, the vacuum tank 61 may be disposed below the inner space of the case 10, as shown in Figs. Such a vacuum tank 61 has a volume relatively larger than that of the capillary viscometer 40 which measures the absolute viscosity of the asphalt sample while substantially forming a vacuum. The volume of the capillary viscometer 40 is controlled by a capillary viscometer It is possible to prevent a sudden change in pressure when the vacuum is supplied to the vacuum chamber 40.

The vacuum tank 61 is connected to the diaphragm pump 62 by the air suction pipe 63 so that the air in the vacuum tank 61 is forcedly supplied to the diaphragm pump 62 during operation of the diaphragm pump 62, A vacuum can be formed inside the vacuum tank 61 at a predetermined pressure.

The air in the vacuum tank 61 sucked into the diaphragm pump 62 is connected to the diaphragm pump 62 again and discharged to the outside through the air discharge pipe 64, .

On the upper side of the vacuum tank 61, a pressure sensor for measuring the pressure inside the vacuum tank 61 may be provided. A solenoid valve 67 may be provided on the air suction pipe 63 for controlling the suction amount of air sucked from the vacuum tank 61 to the diaphragm pump 62 side.

The amount of opening of the solenoid valve 67 is automatically adjusted based on the pressure inside the vacuum tank 61 measured by the pressure sensor 69 so that the viscosity of the vacuum supplied to the capillary viscometer 40 for measuring the absolute viscosity of the asphalt sample Pressure can be maintained or adjusted.

On the other hand, the vacuum supply unit 60 is provided on the vacuum connection pipe 65, as shown in Figs. 2 and 3A, and is provided with a vacuum connection pipe 65 for supplying vacuum to the capillary viscometer 40 And a toggle valve 66 for interrupting the flow.

The vacuum supply unit 60 may further include a vacuum filter 68 provided on the vacuum connection pipe 65 for filtering foreign substances in the air flowing from the capillary viscometer 40.

The vacuum filter 68 serves to protect the vacuum supply unit 60 by preventing foreign substances from flowing into the vacuum tank 61 or the diaphragm pump 62 for forming the vacuum.

Therefore, the durability can be improved through the protection of the vacuum supply part 60 for forming a vacuum, and the reliability of the absolute viscosity measurement can be further improved.

FIG. 7 is a partially cutaway perspective view taken along line A-A of FIG. 1, and FIG. 8 is a side view of a capillary viscometer of the configuration of FIG.

A process of measuring the absolute viscosity of an asphalt sample using the asphalt absolute viscometer according to an embodiment (1) of the present invention will be briefly described below with reference to the accompanying drawings.

1 to 8, a predetermined amount of the asphalt sample to be measured is inserted into the capillary viscometer 40, and then the diaphragm pump 62 is operated so that air in the vacuum tank 61 To the diaphragm side through the air suction pipe (63), so that the vacuum tank (61) can form a predetermined vacuum.

The vacuum formed in the vacuum tank 61 is supplied to the capillary viscometer 40 by the operation of the toggle valve 66 provided on the vacuum connection pipe 65 and is supplied to the vacuum tank 68 through the vacuum filter 68, (61) or the diaphragm pump (62) is filtered. At this time, it is natural that the pump pressure of the solenoid valve 67 and the diaphragm pump 62 can be adjusted so that a predetermined vacuum pressure necessary for measuring the absolute viscosity of the asphalt sample can be formed by using the solenoid valve 67.

After the measuring operation, the tester opens the opening / closing door 15 provided in front of the case 10 to open the inside of the thermostat bath 5 where the absolute viscosity is measured by the capillary viscometer 40 to the LED module 110 So that it can be confirmed more clearly.

The capillary-type viscometer 40 may be formed in a substantially U-shape, as shown in Figs. 7 and 8. Here, when vacuum is supplied to one side 40a of the capillary viscometer 40, the asphalt sample inserted therein is moved to the other side 40b by a predetermined vacuum flow regardless of the gravity direction, The absolute viscosity of the asphalt sample can be measured immediately.

Therefore, it is possible to omit the process of measuring the relative viscosity measured to be influenced by the gravity, and to minimize the influence of the external temperature, which is advantageous in that a more reliable measurement result can be derived.

As described above, one embodiment of the asphalt absolute viscometer according to the present invention has been described in detail with reference to the accompanying drawings. However, it is to be understood that the embodiments of the present invention are not necessarily limited to the above-described embodiments, and that various modifications and equivalents may be made by those skilled in the art to which the present invention pertains will be. Therefore, the true scope of the present invention should be determined by the following claims.

1: Asphalt absolute viscometer 5: Constant temperature oil bath
10: Case 11: Fixed case
15: opening / closing door 20: upper frame
25: Viscometer mounting hole 30:
31: Control panel 32: Operation button
33: display part 40: capillary viscometer
41: viscometer lid 50: stirrer
60: Vacuum supply part 61: Vacuum tank
62: diaphragm pump 63: air suction pipe
64: air discharge pipe 65: vacuum connection pipe
66: toggle valve 67: solenoid valve
68: Vacuum filter 69: Pressure sensor
80: water level sensor 90: temperature sensor
100: Sheath heater 110: LED module

Claims (12)

A case having an outer space and formed with an inner space;
A thermostat disposed in an inner space of the case and containing a temperature maintaining medium;
A capillary viscometer which is partially immersed in the temperature maintenance medium of the thermostatic oil bath and in which the asphalt sample flows in a direction opposite to the direction of gravity by a vacuum supplied from one side;
A vacuum supply unit for supplying the vacuum to the capillary viscometer;
At least one temperature sensor for measuring the temperature of the temperature-maintaining medium in the thermostatic oil bath; And
A level sensor for sensing a level of the temperature-maintaining medium in the thermostatic oil bath; Asphalt absolute viscometer. The method according to claim 1,
At least one sheath heater disposed inside the thermostatic oil bath and heating the temperature maintaining medium; Further comprising: an asphalt absolute viscometer. delete The method according to claim 1,
Wherein the at least one temperature sensor comprises:
An asphalt absolute viscometer fixed at a predetermined position inside the thermostatic oil bath and positioned at 1/3 and 2/3 of the height of the thermostatic oil bath. The method according to claim 1,
A stirrer for stirring the temperature holding medium of the thermostatic oil bath; Further comprising: an asphalt absolute viscometer. The method according to claim 1,
A capillary viscometer, a plurality of vacuum connection pipes connected to the vacuum supply unit to supply a vacuum to the capillary viscometer, a temperature sensor, a level sensor, a temperature sensor, Temperature maintenance Asphalt absolute viscometer equipped with an upper frame that mediates the installation of a stirrer to agitate the medium. The method according to claim 1,
The vacuum supply unit includes:
A vacuum tank provided on the lower side of the thermostatic oil bath in an inner space of the case;
A diaphragm pump provided at one side of the thermostatic oil tank and sucking and discharging air in the vacuum tank;
A vacuum connection pipe connecting the vacuum tank and the capillary viscometer; And
An air discharge pipe connected to the operation of the diaphragm pump for discharging air in the vacuum tank and an air supply pipe for sucking air into the vacuum tank; Asphalt absolute viscometer. The method of claim 7,
The vacuum supply unit includes:
A toggle valve provided on the vacuum connection pipe for interrupting the air flow of the vacuum connection pipe for supplying vacuum to the capillary viscometer; Further comprising: an asphalt absolute viscometer. The method of claim 7,
The vacuum supply unit includes:
A vacuum filter provided on the vacuum connection pipe for filtering foreign substances in the air flowing from the capillary viscometer; Further comprising: an asphalt absolute viscometer. The method according to claim 1,
The aseptic absolute viscometer is made of a transparent tempered glass material whose inside is observed from the outside. The method of claim 10,
A stationary case provided to fix the thermostat oil reservoir in an inner space of the case and configured to open at an upper portion and a front portion; And
A pair of LED modules fixed to one side and the other side of the outside of the fixing case and irradiating predetermined light toward the thermostatic oven; Further comprising: an asphalt absolute viscometer. The method of claim 11,
An opening / closing door provided at a front portion of the case and opening / closing the front of the opening of the fixing case; Further comprising: an asphalt absolute viscometer.

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