KR20090002928A - System for liquid density measurement - Google Patents

Abstract

A system for liquid density measurement is provided to perform measurement task effectively and increase the level of accuracy of density measurement standard. A system for liquid density measurement comprises a hydrometer main body(10) in which the liquid of the predetermined amount is poured; a motor(11) installed on the top of the hydrometer main body; a screw shaft(13a) extended vertically to inner bottom of the hydrometer main body; a globe support plate(15) performing ascending and descending movement, and adjusting the height; and a pan weighing a silicon globe, supported by a weighing rod(16), placed inside of the hydrometer main body.

Description

Liquid density measurement device {System for liquid density measurement}

1 is a perspective view showing a liquid density measuring apparatus according to an embodiment of the present invention

Figure 2 is a front view showing the state before the sphere weighing the liquid density measuring apparatus according to an embodiment of the present invention

Figure 3 is a front view showing a state after the old wewing of the liquid density measuring apparatus according to an embodiment of the present invention

4 is a front view showing various states of use of the liquid density measuring apparatus according to an embodiment of the present invention;

5 is a schematic view showing a conventional liquid density measuring apparatus

<Description of the symbols for the main parts of the drawings>

10: liquid meter body 11: motor

12: main shaft 13a, 13b: screw shaft

14a, 14b: guide bar 15: old support plate

16: weighing rod 17: fan

18: sub axis 19: sensor plate

20: sensor 21: sensor bracket

22: base 23a, 23b: old seating surface

24: Old seating ring 25: Motor frame

26: liquid-liquid cap 27: liquid inlet

28: liquid outlet

The present invention relates to an apparatus for measuring liquid density, and more particularly, by implementing a new system having a means for raising and lowering a silicon sphere in a liquid-liquid system, it is possible to efficiently perform the density measurement operation by height between all liquid-liquid systems. And, ultimately, to a level of accuracy of the density measurement standard and to establish a standard for density measurement.

In general, in order to improve the accuracy level of density measurement standards, researches on the calibration of the liquid liquor using silicon spheres are being actively conducted by measurement research institutes in developed countries.

In general, density measurement for reference liquids is dependent on the manual operation of the operator, which reduces the accuracy of data and the efficiency of the measurement work, and the level of accuracy of density measurement due to problems such as difficulty in maintaining the optimal environment for density measurement. This is lower than the international level.

In the case of the liquid-liquid meter, which is the standard when measuring the density of the current standard liquid, it is necessary to properly compensate for errors caused by environmental changes such as height variation, time lapse, temperature, pressure, and humidity. Until now, the density measurement of the reference liquid has been disadvantageous in that it is inefficient in terms of workability and accurate measurement data cannot be obtained due to the total dependence on manual labor or the use of rather complicated equipment and methods.

For example, as shown in FIG. 5, the conventional liquid density measurement method uses a plurality of supporters 110 having different heights in the liquid liquor system 100 filled with liquid to form the silicon spheres 120 by height. After weighing, it is a method of measuring the density of a liquid by a well-known calculation formula with the mass value of the silicon sphere obtained at this time, and the density of the silicon sphere known previously.

Here, reference numeral 130 denotes a fan extending from the upper scale (not shown) for mass measurement.

However, the conventional liquid density measurement method described above is inefficient in density measurement, such that each supporter must be installed in the liquid liquor system in order to measure the silicon spheres according to the height of the liquid liquor. In the process of raising and lowering the system, it is difficult to secure the accuracy of density measurement due to the balance drift error due to the shaking of the liquid surface and the error caused by the change in the height of the water surface.

Therefore, the present invention has been devised in view of the above, and the new density measurement applying the method of measuring the silicon spheres by height while varying the height of the silicon spheres in the liquid liquor system without excluding a method of changing the height of the liquid liquor system itself. By implementing the system, it is possible to eliminate the balance drift error due to the shaking of the liquid surface and to efficiently measure the density by height throughout the whole part of the liquid liquor system. It is an object of the present invention to provide a liquid density measuring apparatus that can ultimately increase the level of accuracy of density measurement standards and at the same time establish a standard for density measurement.

The present invention for achieving the above object is a liquid-containing body filled with a certain amount of liquid, a motor installed on the upper portion of the liquid-liquid body and connected to the main shaft of the motor and rotatable to the inner bottom of the liquid-liquid system body A vertically extending screw shaft, a support plate which is supported by both guide bars parallel to the screw shaft and screw-driven in combination with the screw shaft, and capable of raising and lowering operation and height adjustment, and a wading rod extending vertically from the electronic balance. It is characterized in that it comprises a fan that is supported by and positioned inside the liquid-liquid system body for wewing the silicon spheres.

In addition, a sensor plate coupled to the screw shaft directly connected to the sub-axis of the motor and capable of raising and lowering operation and supported by at least three guide bars, and installed on one side of the sensor plate, It further comprises a sensor means for controlling the operation of the support plate consisting of a sensor for sensing the upper and lower position and the sensor bracket for supporting it.

In addition, the sphere support plate is characterized in that it is to support the silicon sphere in a three-point support method by using three pedestals of a predetermined height disposed at 180 ° intervals.

In addition, the fan is characterized in that it comprises a sphere seating ring having at least two sphere seating surfaces of different curvature.

In addition, the sphere seating ring having the fan is characterized in that coupled to the removable structure from the fan body.

Hereinafter, a liquid density measuring apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing a liquid density measuring apparatus according to an embodiment of the present invention.

As shown in Fig. 1, the liquid density measuring apparatus has a liquid-liquid system main body 10 and a liquid-liquid height for filling a liquid to be largely measured for density, with the main feature of a system for loading and measuring spheres in a liquid. Motor 11, which is a driving means capable of moving the position (height) of the silicon sphere for star density measurement, a sphere support plate 15 supporting the silicon sphere while being linked with the motor 11, and a weighing for measuring the weight of the silicon sphere A fan 17, a scale (not shown), and the like.

The liquid-liquid main body 10 is formed in the form of a long transparent cylindrical container, and is provided with an upper liquid inlet 27 and a lower liquid outlet 28 for inputting and discharging liquid, and having an open upper end. Is also provided with a ring-shaped liquid-liquid cap 26 of the annular center is to be able to install a bracket for supporting the motor and the like.

In addition, although not shown, the liquid-liquid system main body 10 may include a temperature sensor for measuring the temperature of the liquid, a CCD camera for sensing the surface of the liquid, and the like.

The motor 11 is a means for raising or lowering the sphere support plate 17 supporting the silicon sphere.

That is, during webbing, it can operate up and down briefly to place the silicon spheres on the pan or float from the pan, and when measuring the density for each height, the sphere support plate 17 including the silicon spheres up to the required height is operated by long operation up and down. After this, the waing can be made at this position.

To this end, the motor 11 is installed in a structure that is supported on the motor frame 25 on one side of the liquid-liquid cap 26 mounted on the upper end of the liquid-liquid system main body 10.

At this time, the motor frame 25 is composed of three plates arranged up and down at a predetermined interval and a plurality of pillars erected therebetween, and the lower plate is fastened and fixed to the side of the liquid-liquid cap 26. It is installed in such a way that the whole is supported while partially extending, the motor is vertically installed on the middle plate, and the sensor bracket and the like described later are installed on the upper plate.

The motor 11 has a form having each of the upper and lower shafts, for example, the lower main shaft 12 and the upper sub-shaft 18, so that each shaft can be operated simultaneously when the motor is driven.

The screw shaft 13a is connected to the main shaft 12 of the motor 11 via a coupling, and the screw shaft 13a extends vertically to the inner bottom of the liquid-liquid system main body 10 at this time. It is arranged to be rotated together when the motor is driven.

In addition, two guide bars 14a parallel to the side of the screw shaft 13a are vertically disposed on both sides of the screw shaft 13a. In the case of the guide bar 14a at this time, the upper end is fixed on the motor frame 25, and the lower end is Is supported by a structure that is fixed together with the lower end of the screw shaft (13a) on a separate bracket.

The screw shaft 13a and the guide bar 14a installed in this way serve to raise and lower the sphere support plate 15 supporting the silicon sphere and to guide the rise and fall of the sphere support plate 15.

The sphere support plate 15 on which the silicon sphere is placed is horizontally installed in such a manner that one side is coupled to the screw shaft 13a in a screw-transmissible structure and simultaneously coupled to the guide bar 14a in a slide-binding structure.

The sphere support plate 15 is provided with a hole for interference with the sphere, and three pedestals 22 having a predetermined height are disposed around the hole at intervals of 180 °. It can be supported by a stable form of support.

As a means for weighing the silicon sphere, the fan 17 is installed in the form adjacent to the sphere support plate 15 in the side of the liquid-liquid main body 10 in parallel with this.

This fan 17 is supported in the form of being suspended from a weighing rod 16 extending vertically from a scale (not shown) and is capable of weighing the weight of the silicon spheres that are placed over it.

To this end, the fan 17 is provided with a sphere seating ring 24 having a hole of a smaller diameter than the diameter of the silicon sphere, so that the silicon sphere can be wewed therein.

In addition, the sphere seating ring 24 is formed along the hole edge at least two sphere seating surfaces 23a, 23b having different curvatures to extinguish at least two silicon spheres with one sphere seating ring. It is supposed to be.

In particular, the sphere seating ring at this time is coupled to the removable structure from the fan body, and thus can be actively coped with the situation change by simply replacing the sphere seating ring when the application of the silicon spheres of different diameters.

On the other hand, the scale may be separately installed on the upper portion of the frame structure (not shown) in which the liquid-liquid meter body 10 is installed, and the hook (not shown) on the scale side is installed on the upper end of the wading rod 16. Hanging the hooks will prepare you for wading.

The present invention provides a sensor means for controlling the support plate as a means for paying more attention to the operation control associated with the stroke of the sphere support plate 15 when wewing the silicon sphere.

To this end, a screw shaft 13b is directly connected to the sub-shaft 18 of the motor 11, and the sensor plate 19 has a structure capable of screwing the screw shaft 13b in such a manner that its center penetrates through the screw shaft 13b. At the same time, the sensor plate 19 is supported by a structure that can be guided by at least three guide bars 14b standing on the motor frame 25, while the side of the sensor plate 19 is supported. The upper and lower two sensors 20 are installed by using one side of the sensor bracket 21 vertically installed on the motor frame 25.

At this time, the sensor 20 is a sensor for detecting the upper and lower upper and lower positions of the sensor plate 19, a sensor that detects the presence or absence of interference with the sensor plate 19, for example, including a light emitting unit and a light receiving unit Photo sensor and the like can be used.

The sensor 20 may be installed through the slot of the sensor bracket 21, and thus the up and down distance between the sensors may be adjusted so that the up and down operating range of the sensor plate 19 is operated with a stroke proportional thereto. The operating range of the sphere support plate 15 can be adjusted as needed.

As a result, the old support plate 15 and the sensor plate 19, which are coupled to the upper and lower screw shafts 13a and 13b having the same pitch when the motor is driven by the screw-movable structure, are raised or lowered simultaneously. When the sensor 20 detects the upper and lower limit positions of the sensor plate 19, the operation of the motor 11 is controlled by the output control of the controller (not shown) which is used as an input value to the detection signal. Stroke) can also be controlled.

Here, the method of controlling the operation of the motor through the output control of the controller using the sensing signal of the sensor as an input value can be adopted without particular limitation as long as it is a method commonly known in the art.

Figure 2 is a front view showing a state before the old measuring of the liquid density measuring apparatus according to an embodiment of the present invention, Figure 3 is a front view showing a state after the old measuring of the liquid density measuring apparatus according to an embodiment of the present invention.

As shown in FIG. 2, the silicon sphere 120 is placed on the three pedestals 22 of the sphere support plate 15 at a predetermined height in the liquid-liquid main body 10 filled with the liquid for density measurement. In addition, the fan 17 is disposed in parallel with the sphere support plate 15.

At this time, the silicon sphere 120 and the fan 17 are in a state where they do not interfere with each other.

As shown in FIG. 3, when the motor 11 is driven, the screw shaft 13a, which is integrally connected to the main shaft 12, rotates, and at the same time, the old support plate 15 which is screw-transferred with the screw shaft 13a. ) Is lowered while being guided by both guide bars 14a, so that the silicon sphere 120 in the sphere support plate 15 is placed on the sphere seating ring 24 of the fan 17. Weighing is made for 120).

After weaving the silicon sphere, the sphere support is raised by the reverse driving of the motor, and the silicon sphere webbing process is completed by supporting the silicon sphere again.

At this time, when the up and down movement of the old support plate 15, the stroke can be controlled by using the sensor 20 for detecting the upper and lower positions of the sensor plate 19 moving up and down in proportion to this.

4 is a front view showing various states of use of the liquid density measuring apparatus according to an embodiment of the present invention.

As shown in FIG. 4, the density measurement state for each height of the liquid-liquid range is shown here, that is, a state in which the density can be measured at an arbitrary height over the entire height section of the liquid-liquid body.

For example, the height of the sphere support plate 15 including the silicon sphere 120 can be moved using the drive of the motor 11, and unlike the conventional method of using a conventional supporter having a predetermined number of heights, At height, that is to say, the density measurement can be carried out at various locations in the buoyancy system where different buoyancy acts.

Of course, if the height in the liquid-liquid system to perform the density measurement is determined, it is necessary to set the height of the fan or the sensor means accordingly.

Therefore, the process of measuring the density of the liquid using the liquid density measuring apparatus of the present invention will be briefly described as follows.

First, the mass value is obtained by weighing a silicon sphere (density reference material) having a known density in advance using a pan in a liquid-liquid system, and then using a known calculation formula based on the obtained mass value of the silicon sphere and the density value of the known silicon sphere. Find the density of the liquid through

Here, although the value which can be measured substantially using a density measuring apparatus is a mass value, finally, the density value of a liquid can be calculated | required through a calculation formula.

As described above, the present invention implements a new system for measuring the density of liquids by means of raising and lowering the silicon spheres in the liquid-liquid system, thereby efficiently performing the density-specific work of measuring the height of the liquid-liquid system throughout the entire range. There is an advantage to perform, and furthermore, it is possible to increase the level of accuracy of the density measurement standard and to establish a standard for density measurement.

Claims (5)

In the liquid density measuring device, The liquid-liquid meter is connected to the liquid-liquid main body 10 filled with a predetermined amount of liquid, the motor 11 installed on the upper part of the liquid-liquid system main body 10, and the main shaft 12 of the motor 11 and is rotatable. The screw shaft 13a, which is vertically extended to the inner bottom of the main body 10, is supported by both guide bars 14a parallel to the screw shaft 13a, and the screw shaft 13a is screwably combined with the screw shaft 13a. The fan is placed in the liquid-liquid system main body 10 and supported by a sphere support plate 15 capable of raising and lowering operations and heights, and a webbing rod 16 vertically extending from the electronic balance. 17) Liquid density measuring apparatus comprising a. The method according to claim 1, wherein the screw is coupled to the screw shaft 13b directly connected to the sub-axis 18 of the motor 11, which is supported by at least three guide bars 14b while being capable of raising and lowering. Supporting plate sensor for controlling the operation of the base plate is composed of a sensor plate 19, the sensor 20 is installed on one side of the sensor plate 19 to detect the upper limit position and the lower limit position of the sensor plate and the sensor bracket 21 for supporting it. And a means for measuring liquid density further. The liquid density measuring apparatus according to claim 1, wherein the sphere support plate (15) supports the silicon sphere in a three-point support manner by using three pedestals (22) of constant height arranged at intervals of 180 degrees. The liquid density measuring apparatus according to claim 1, wherein the fan (17) comprises a spherical seating ring (24) having at least two spherical seating surfaces (23a, 23b) having different curvatures. The liquid density measuring apparatus according to claim 1 or 4, wherein the spherical seating ring (24) of the fan (17) is coupled in a structure detachable from the fan body.

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