KR102339944B1 - Precise Hydrometer Calibration Apparatus using Solid Density Standard - Google Patents

Abstract

The present invention relates to a device which measures the density of a reference liquid for calibration of a hydrometer, which is a measuring instrument for measuring the specific gravity of a liquid, and uses the density to calibrate the hydrometer. The present invention implements a complex calibration system with a new form obtained by combining: a reference liquid elevating device for loading, unloading, and elevating a vessel containing the reference liquid; a weighing device for weighing the hydrometer; a vision device for calibrating the hydrometer; and a liquid density device for density measurement of the reference liquid. Therefore, the present invention provides the precise hydrometer calibration apparatus using solid density standards, which ensures use convenience and efficiency and high precision during a hydrometer calibration operation, thereby increasing calibration quality and reliability.

Description

Precise Hydrometer Calibration Apparatus using Solid Density Standard

The present invention relates to an apparatus for measuring the density of a reference liquid for calibration of a hydrometer, which is a measuring instrument for measuring the specific gravity of a liquid, and calibrating the hydrometer using this.

In general, a hydrometer is a measuring instrument that measures the specific gravity of a liquid by balancing the mass of a weight in a liquid and the buoyancy acting on it. It is mainly used to measure alcohol, milk, sucrose, and salinity.

For example, the density of the analysis liquid is estimated by comparing the density of pure water at 15.5°C, and it can be conveniently used when it is necessary to check the salinity of water by collecting a seawater sample.

In order to prevent such errors of the hydrometer, correcting the precision is "calibration", and in order to use the hydrometer properly within the tolerance range, regular maintenance or calibration is required.

Generally, in the case of a hydrometer, measurement accuracy can be secured only by appropriately compensating for errors caused by environmental changes such as height deviation, passage of time, temperature, pressure, and humidity.

And, for accurate calibration of the hydrometer, the density of the reference liquid is measured, and the buoyancy corresponding to the measurement scale of the hydrometer submerged in the reference liquid is measured using the measured density value of the reference liquid and the scale value of the scale. , the method of correcting the error by measuring the actual value of the hydrometer scale at this time is mainly used.

Accordingly, the present invention provides a reference liquid density measurement device and a hydrometer calibration device that enables the density measurement and hydrometer calibration of the reference liquid to be performed in one stage to ensure convenience, speed, and accuracy of calibration work. The combination of

Laid-Open Patent Publication No. 10-2009-0002928 Laid-Open Patent Publication No. 10-2001-0074139

Therefore, the present invention has been devised in consideration of this point, and the reference liquid elevating device for loading and unloading, and elevating and lowering of the vessel containing the reference liquid, the weighing device for measuring the hydrometer, and the scale measurement of the hydrometer By implementing a new type of complex calibration system that combines a vision device for measuring the density of a reference liquid and a liquid density device for measuring the density of a reference liquid, convenience, efficiency, and high precision can be ensured when calibrating the hydrometer, and calibration quality and An object of the present invention is to provide a precision hydrometer calibration device using a solid density reference material that can increase reliability.

In order to achieve the above object, a precision hydrometer calibration device using a solid density reference material provided in the present invention has the following characteristics.

The precision hydrometer calibration device using the solid density reference material includes a main body that can be moved and fixed in position, an X-axis linear motion that is installed on the inner lower part of the main body and can move in the X-axis direction, and a Y that can move in the Y-axis direction. A reference liquid lifting device including a lifting plate that supports a vessel at the same time capable of ascending and descending by axial linear motion and Y-axis linear motion, and installed on the inner upper part of the main body to hold the object to be calibrated before and after weighing A weighing device comprising a hanger plate for placing a still object, a step motor for raising or lowering the hanger plate for measurement, a screw driving part, and a scale for weighing an object to be calibrated while having a weing hook, and a reference in the inner lower part of the body A vision device including a CCD camera installed on one side of the liquid lifting device and capable of ascending and descending together and reading the scale of an object to be calibrated, and a linear scale for distance movement of the CCD camera, and a reference liquid from the inner lower part of the body A support plate installed on the vessel of the lifting device, holding the solid density reference object before and after weighing, and placing the solid density reference object during weighing, and a step motor and screw driving unit that raise or lower the support plate for weighing, and the solid density reference It consists of a structure comprising a liquid density device including a weighing pan for hanging water on the weighing hook side of the scale.

Therefore, the precision hydrometer calibration device using the solid density reference material has a feature that enables precise measurement as well as convenience in use, such as linking the density measurement operation of the reference liquid and the hydrometer calibration operation in one facility. have.

Here, the weighing device can be seated or separated in a mounting hole formed in a rhombic shape with a hole in the front formed in the hanger plate, and at the same time, the upper end can be hung on the weighing hook of the scale, and the lower end is the weighing where the object to be calibrated is suspended It may further include a hook for a hanger on which a rod can be hung, and accordingly, depending on whether the hook for the hanger is seated, the object to be calibrated can be measured by holding the object to be calibrated before and after measurement and releasing the object to be calibrated during measurement.

In addition, the linear scale of the vision device includes a lower base block on which a rack gear is mounted, an upper slide block capable of moving forward and backward along the lower base block, and a rack gear rotatably coupled to the upper slide block and It may include an operation lever having a meshing pinion gear, and at least one fixed lever rotatably coupled to the upper slide block and contactable to the lower base block side through a front end.

The vision device includes an upper camera block and a lower camera block that are vertically coupled by an arc-shaped slide coupling part while supporting the CCD camera as a means for adjusting the vertical angle of the CCD camera, and a bottom surface of the upper camera block. It may include a camera angle adjusting device composed of a half-moon-shaped worm wheel coupled to the unit, and an angle operation lever having a worm gear that is coupled while being inserted into the lower camera block and capable of meshing transmission with the worm wheel.

In particular, the liquid density device is installed in a structure supported on the vessel of the reference liquid elevating device using a ring-shaped device support frame coupled in a detachable structure along the upper edge of the vessel, and the liquid density device thus installed. By aligning the center of the support plate with the center axis of the weing hook extending vertically downward from the scale, it is desirable to make it possible to use one scale in common when measuring reference liquid density and calibrating the hydrometer.

The precision hydrometer calibration device using the solid density reference provided by the present invention has the following effects.

First, loading and unloading of a vessel containing a reference liquid, and a reference liquid lifting device for lifting and lowering, a weighing device for weighing a hydrometer, a vision device for calibrating a hydrometer, and liquid density for measuring the density of the reference liquid By applying a new hydrometer calibration device that combines devices, etc., there is an effect of improving calibration quality and reliability, such as ensuring high precision as well as convenience of calibration work.

Second, by linking the density measurement of the reference liquid and the calibration of the hydrometer in one device, it is possible to improve the efficiency and accuracy of the calibration work, such as making the calibration work quickly and precisely measuring it. there is an effect

Third, since it is a structure in which each device is integrated in a body that can be moved and fixed in position, it is possible to efficiently and economically operate the entire facility, such as having the advantage of easy handling as well as maintenance and A/S of the facility. can have an effect.

Fourth, in addition to hydrometer calibration, there is an effect that can be used for various purposes in a wide range of fields, such as being designed to measure the density of a solid density reference material and a standard weight, which is a standard material for mass measurement.

1 is a front view showing a precision hydrometer calibration device using a solid density reference material according to an embodiment of the present invention;
2 is a plan view showing a precision hydrometer calibration device using a solid density reference material according to an embodiment of the present invention;
3 is a side view showing a precision hydrometer calibration device using a solid density reference material according to an embodiment of the present invention;
4 to 6 are a front view, a plan view, and a side view showing a metering device in a precision hydrometer calibration apparatus using a solid density reference according to an embodiment of the present invention;
7 to 9 are a front view, a plan view, and a side view showing a vision device in a precision hydrometer calibration apparatus using a solid density reference according to an embodiment of the present invention;
10 to 12 are a front view, a plan view and a side view showing a liquid density device in a precision hydrometer calibration apparatus using a solid density reference according to an embodiment of the present invention;

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 are a front view, a plan view, and a side view showing a precision hydrometer calibration device using a solid density reference according to an embodiment of the present invention.

1 to 3, the precision hydrometer calibration device using the solid density reference includes a main body 10 capable of moving and positioning.

The main body 10 is a rectangular box-shaped structure, and wheels 44 and a stopper 45 are installed at the lower end of the main body 10, so that the main body 10 can be easily moved to a desired place and location and measured. It can be fixed so that it does not wobble.

And, an air tight 46 that blocks draft or external force is formed at the upper end of the body 10, and the scale 19 can be installed inside the air tight 46 thus formed.

Accordingly, more precise and accurate weighing can be achieved such that the sensitive scale 19 is not affected by drafts or the like.

In addition, the reference liquid density measuring device and the hydrometer calibration device are installed and the reference liquid is raised and lowered by means of loading and unloading the vessel 100 made of a transparent glass container to contain the reference liquid, as well as raising or lowering it to a predetermined height. device 14 .

The reference liquid elevating device 14 is installed in the lower inner portion of the body 10 and uses the X-axis linear motion 11 and the Y-axis linear motion 12 to move the vessel 100 in the X-axis direction (front-back direction of the body). and the Y-axis direction (up and down direction of the body).

To this end, the X-axis linear motion 11 is horizontally installed in parallel along the X-axis direction at the bottom of the main body 10, and on the X-axis linear motion 11 installed in this way, an integral combination of a horizontal plate and a vertical plate The base frame 47 made of is installed, and the Y-axis linear motion 12 is vertically installed in parallel along the Y-axis direction on one side of the vertical plate of the base frame 47 at this time.

Here, the X-axis linear motion 11 may be applied to a type in which an operator can operate the base frame 47 by pushing or pulling without a separate power, and the Y-axis linear motion 12 is a base frame The motor (12a) installed on the bottom surface of the horizontal plate of (47) and the screw shaft (12b) connected to the motor shaft while being installed in a structure supported on one side of the vertical plate, and disposed in parallel on both sides of the screw shaft (12b) It is composed of a slide block/rail (12c) installed on one side of the vertical plate, and a type that raises or lowers the lifting plate 13 by motor power and screw transmission can be applied.

In addition, the reference liquid lifting device 14 includes a lifting plate 13 supporting the vessel 100 , wherein the lifting plate 13 is a slide block/rail 12c of the Y-axis linear motion 12 . It is horizontally installed in a structure supported on the As a result, the vessel 100 placed on the lifting plate 13 can also be raised and lowered.

Accordingly, the vessel 100 is placed on the lifting plate 13 in a state in which the base frame 47 is pulled out toward the lower rear of the main body 10 , and the base frame continues along the X-axis linear motion 11 . When the motor 12a of the Y-axis linear motor 12 is operated in a state where the 47 is positioned in the lower front of the main body 10, the entire vessel 100 including the lifting plate 13 is corrected. It is raised to a height made or lowered after the corrective operation to be able to return to the lower part of the main body 10 .

In addition, the precision hydrometer calibration apparatus using the solid density reference material includes a weighing device 20 as a means for measuring the object to be calibrated (hydrometer) and the solid density reference object using the scale 19 .

4 to 6, the metering device 20 is installed on the inner upper portion of the body 10 to measure the mass of the object to be calibrated 110 in the reference liquid, or to measure the mass of the object to be calibrated in the reference liquid, or the solid density reference object in the general liquid It serves to measure the mass of (120).

To this end, the weighing device 20 includes a scale 19 for actual mass measurement, a hanger plate 15 for holding or releasing an object to be calibrated, and a step motor 16a for controlling the vertical height of the hanger plate 15. ) and a screw driving unit 17a and the like.

The scale (reference numeral 19 in FIGS. 1 to 3 ) is a measuring means for measuring buoyancy (measured value of the scale), and the air tight (reference numeral 46 in FIGS. 1 to 3 ) installed at the upper end of the main body 10 . ), and the scale 19 installed in this way is provided with a weing hook 18 in the form of a wire having a hook at the end while vertically extending downward.

Accordingly, if a hydrometer or a solid density reference object is hung on the weing hook 18, the mass thereof can be measured.

The step motor 16a is installed on a horizontal plate of the motor base 48 formed of a combination of a horizontal plate and a vertical plate installed on the upper end of the main body 10 .

The screw drive unit 17a is composed of a screw shaft 17a-1 and a nut block 17a-2, and the screw shaft 17a-1 at this time is a screw block installed in front of the vertical plate of the motor base 48. While passing through 49, it is coupled to the shaft of the step motor 16a through its upper end, and the nut block 17a-2 is a slide of the LM guide 50 installed in front of the vertical plate of the motor base 48. It is coupled to the block to receive guidance during up-and-down operation, and is coupled to the screw shaft 17a-1 and the screw rotationally.

The hanger plate 15 serves to hold the object to be calibrated before and after weighing and to release the object to be calibrated during measurement. The hanger plate 15 takes a horizontal posture and passes through the rear end of the nut block of the screw drive unit 17a ( It is installed in a structure coupled to 17a-2).

In addition, the front end of the hanger plate 15 is formed with a rhombic mounting hole 27 having a hole in the front. there will be

Accordingly, when the step motor 16a operates, the screw shaft 17a-1 rotates and at the same time the nut block 17a-2 moves up and down by screw transmission, and eventually the nut block 17a- The hanger plate 15 coupled to 2) also moves up and down.

In particular, the weighing device 20 is interposed between the weighing hook 18 side of the scale 19 and the weighing rod 28 side of the object to be calibrated or the ring side of the weighing pan 25, so that the accuracy and convenience of the weighing operation , It includes a hook 29 for a hanger that can ensure the compatibility of the weeing water.

The hanger ring 29 is formed in a form in which two triangular shapes of different sizes are connected symmetrically to each other, for example, in a form in which the vertices of two triangles are connected to each other, at this time the hanger ring 29 ) at the upper end and lower end, respectively, the concave portion is bent.

Here, the upper concave portion of the hook 29 for hanger can be hung on the weing hook 18 of the scale 19, and the lower concave portion is the upper ring portion of the weing rod 28 in which the object to be calibrated is suspended or The upper ring portion of the weing pan 25 on which the solid density reference rests may be hung.

This hanger ring 29 is hung on the side of the hanger plate 15 according to the rising position or the falling position of the hanger plate 15 while being positioned inside the mounting hole 27 formed in the hanger plate 15 . supported or detachable from the hanger plate 15 .

For example, when the hanger plate 15 rises, the hanger ring 29 at this time rises together while being placed on the mounting hole 27 of the hanger plate 15 (in this case, the object to be corrected and the waying) As the rod becomes suspended depending on the hanger plate, the mass of the object to be calibrated is not transmitted to the scale), and when the hanger plate 15 is lowered, the hanger ring 29 at this time is the hanger plate 15 As the state is relatively out of the mounting hole 27, at this time, the object to be calibrated and the weing rod are suspended depending on the weighing hook 18 on the scale side, so that the object to be calibrated is measured on the scale.

In this way, when measuring using the scale 19, the method of weighing the object to be calibrated or the solid density reference object is directly hung on the weing hook 18 by the operator or separated from the weing hook 18 by hand, and the hanger ring 29 ) by using the weighing device 20 including There is, in particular, the advantage of being able to measure various objects to be calibrated because it hangs using the hanger ring 29 as an intermediate medium.

In addition, the precision hydrometer calibration apparatus using the solid density reference material includes a vision device 23 as a means for measuring the actual value of the hydrometer scale when measuring buoyancy.

7 to 9 , the vision device 23 includes a CCD camera 21 that reads the scale of an object to be calibrated, a linear scale 22 for distance movement of the CCD camera 21, and the like, and the main body The scale of the object to be calibrated is measured while the object to be calibrated is immersed in the reference liquid while being installed on one side of the reference liquid lifting device 14 in the lower inner part of (10), and the measured value at this time is measured on the controller (not shown) side plays a role in providing

To this end, the vision device 23 includes a flat plate-shaped fixed plate 51 and a “L”-shaped movable plate 52 serving as a support.

The fixing plate 51 is installed in a structure coupled to one end of the lifting plate 13 while being positioned side by side in a vertical posture opposite the vertical plate of the base frame 47 of the reference liquid lifting device 14 .

The movable plate 52 is installed in a vertically movable structure while being supported by the nut block 53d of the screw driving device 53 installed on the fixed plate 51 .

For example, the screw driving device 53 includes a motor 53a installed at the lower end of the fixing plate 51 and a screw shaft 53b installed on one side of the fixing plate 51 and connected to the motor shaft, and It consists of a slide block/rail 53c installed on one side of the fixing plate 51 while being arranged side by side on both sides of the screw shaft 53b, and the screw shaft 53b and the slide of the screw driving device 53 The block/rail 53c can be installed in a structure in which the lower end of the moving plate 52 is fixed to the nut block 53d, which is coupled to be screwed and supported while being guided by the slide.

Accordingly, the moving plate 52 can go up or down by screw transmission with the screw shaft 53b when the motor 53a is operated, and eventually the CCD supported on the moving plate 52 . The camera 21 can also be raised and lowered.

In addition, the linear scale 22 is bound so as not to be separated in the vertical direction, and the lower base block 31 and the upper slide block 32 are slidably coupled in the left and right directions, and an operation lever for position movement operation. (34) and a plurality of fixing levers (35) for position fixing operation.

The lower base block 31 is installed parallel to the left and right at the upper end of the moving plate 52 , and the rack gear 30 parallel to the block is mounted on the upper surface of the lower base block 31 installed in this way.

The upper slide block 32 is coupled to the upper portion of the lower base block 31 to be able to slide in the left and right directions along the lower base block 31 .

The operation lever 34 is installed in a structure rotatable in place while being penetrated and inserted in the front and rear direction in the upper blythe block 32, and the axis of the operation lever 34 at this time is composed of a pinion gear 33, so that the lower base block ( 31) can be meshed with the rack gear 30.

Accordingly, when the operation lever 34 is turned, the upper slide block 32 can move forward and backward in the left and right directions through gear transmission between the rack gear 30 and the pinion gear 33 .

The plurality of fixing levers 35 , for example, the two fixing levers 35 , are respectively disposed on both sides of the operation lever 34 and are installed on the upper slide block 32 in a rotatable structure in place.

At this time, the fixing lever 35 is installed on the upper slide block 32 in a screw fastening structure, and the end of the fixing lever 35 installed in this way can come into contact with the lower base block 31 side.

Accordingly, when the fixing lever 35 is tightly locked, the end of the fixing lever 35 is pressed to the lower base block 31 side, and eventually the upper slide block by the clamping action of the fixing lever 35 . The position of 32, that is, the position of the CCD camera 21, can be precisely aligned in place.

Of course, when the fixing lever 35 is released, the entire CCD camera 21 including the upper slide block 32 can be moved, so that the position of the CCD camera 21 can be adjusted to a desired position.

In particular, the vision device 23 includes a camera angle adjusting device 42 capable of adjusting the vertical angle of the CCD camera 21 .

The camera angle adjusting device 42 is bound so as not to be separated in the vertical direction by the slide coupling part 36 in the shape of a gentle arc, and the upper camera block 37 is vertically coupled to be slidable in the left and right directions. and a lower camera block 38 .

At this time, the upper camera block 37 moves left and right along the arc-shaped trajectory so that its front part can be lifted up or lowered down (as if moving while drawing a similar trajectory such as the trajectory of the movement of the clock pendulum) As a result, the CCD camera 21 supported on the upper camera block 37 can also take an upward or downward posture depending on the position of the upper camera block 37 , so that the CCD camera 21 is The angle can be adjusted.

In order to move the upper camera block 37 in an arc-shaped trajectory, a half-moon-shaped worm wheel 39 is coupled to the bottom of the upper camera block 37, and the lower camera block 38 An angle operation lever 41 having a worm gear 40 coupled to the worm wheel 39 to enable meshing transmission while being inserted into the block is installed.

Accordingly, when the angle operation lever 41 is turned, the upper camera block 37 moves along an arc-shaped trajectory by the meshing transmission between the worm gear 40 and the worm wheel 39 , and eventually Corresponding to this movement, the angle of the CCD camera 21 can be adjusted upward or downward.

In addition, the CCD camera 21 serves to photograph the scale of a hydrometer, for example, a hydrometer, submerged in the reference liquid at a position horizontal to the water surface of the reference liquid filled in the vessel 100 .

The CCD camera 21 is installed in a structure supported by the camera bracket 54 installed on the upper camera block 38 of the camera angle adjusting device 42, and the CCD camera 21 installed in this way is vertically adjustable. Of course, it is possible to adjust the left and right distances and angles in the vertical direction, so that the hydrometer scale on the reference liquid surface can be photographed accurately and precisely and in various conditions without distortion.

In addition, the precision hydrometer calibration apparatus using the solid density reference material includes a liquid density device 26 as a means for measuring the density of the reference liquid.

10 to 12, the liquid density device 26 immerses the solid density reference material 120 in the reference liquid to measure the buoyancy of the solid density reference material. At the time of calibration of the buoyancy hydrometer It serves to measure the density of the reference liquid to be used, and by using the step motor 16b and the screw drive unit 17b to vertically operate the support plate 24 on which the solid density reference object is placed, the buoyancy of the solid density reference object will measure

To this end, the liquid density device 26 includes a ring-shaped device support frame 43 coupled in a detachable structure along the upper edge of the vessel 100, and the device support frame 43 at this time has three locations. Through the screw fastening and releasing structure to a certain extent, it is possible to attach and detach the vessel 100 side.

A motor frame 55 composed of an upper plate, a lower plate, and a post is installed on one side of the upper surface of the device support frame 43 , and a step motor 16b is installed on the upper plate of the motor frame 55 installed in this way and the lower plate is installed at the same time The upper ends of the two guide bars 56 vertically arranged in parallel with each other on both sides are fixed, and the lower ends of both guide bars 56 at this time are integrally bound by the bar fixing plate 57 .

The screw drive unit 17b is vertically disposed in parallel between the guide bars 56 on both sides, and the upper end of the screw shaft is fixed to the shaft of the step motor 16b and the lower end is fixed to the bar fixing plate 47 through a bearing. It is composed of a (17b-1) and a nut (17b-2) coupled to the screw shaft (17b-1) so as to be screw-rotated while being supported through and guided by the guide bars (56) on both sides.

In addition, the support plate 24 serves to hold the solid density reference material before and after weighing and release the solid density reference material during measurement, and while one side is supported by the nut 17b-2, both guide bars 56 It is installed in a structure to be fitted together, and the support plate 24 installed in this way can be operated up and down together with the nut 17b-2 when the step motor 16b is operated.

At the same time that a hole is formed in the support plate 24, at least three support pins 58 are formed around the hole, and a solid density reference material can be placed on the support pins 58 at this time.

In addition, the liquid density device 26 includes a weighing pan 25 for hanging the solid density reference on the weighing hook 18 side of the scale 19, wherein the weighing pan 25 extends upward. It is possible to hang on the weing hook 18 of the scale 19 by using the hook at the end of the formed rod part, and in this way, the weighing pan 25 is hung on the weing hook 18 and is positioned above the weighing. The center axis of the support plate 24 positioned below the center of the fan 25, that is, the center axis of the hole formed on the support plate 24 can be positioned on the same line.

Such a weing pan 25 can selectively hold or release a solid density reference object according to a raised position or a lowered position of the support plate 24 .

For example, as the support plate 24 rises before and after measuring the buoyancy, the solid density reference material at this time is placed on the support pin 58 of the support plate 24, and when measuring the buoyancy, the support plate 24 is When descending, the solid density reference object at this time is naturally placed on the weing pan 25. At this time, the weing pan 25 on which the solid density reference object is placed is suspended depending on the weighing hook 18 on the scale side. Therefore, the weight of the solid density reference material is performed on the scale 19 .

In particular, the liquid density device 26 is installed in a structure supported on the vessel 100 of the reference liquid lifting device 14 using the device support frame 43 , and the liquid density device 26 thus installed The center of the backing plate 24 (center of the hole) coincides with the central axis of the weing hook 18 extending vertically downward from the scale 19 , while also the mounting of the lifting plate 13 of the weighing device 20 . The hole 27 also coincides with the central axis of the weing hook 18 extending vertically downward from the scale 19, so it is one at the time of reference liquid density measurement using the liquid density device 26 as well as the hydrometer calibration. The scale 19 of It is possible to secure the accuracy and precision of the calibration and to increase the reliability of the calibration quality.

Therefore, the state of use of the precision hydrometer calibration device using the solid density reference material configured in this way is as follows.

The hydrometer calibration method is a method of calculating the density of a reference liquid using a solid density reference material, and then calibrating the hydrometer using the obtained reference liquid and a scale.

1) The method of measuring the density of the reference liquid is obtained by measuring the buoyancy of the solid density reference by immersing the solid density reference in the reference liquid (liquid to be used for calibrating the hydrometer).

In other words, buoyancy (measured on a scale) is the product of the volume of a solid density reference object (known value) and the density of the reference liquid (unknown value) and is based on the Archimedes principle.

2) The method of calibrating the hydrometer is to measure the buoyancy corresponding to the scale of the hydrometer submerged in the reference liquid using a scale and a reference liquid (reference liquid whose density is known through the reference liquid density measurement method), and then measure the hydrometer. It is obtained by measuring the actual value of the scale.

This will be described in more detail as follows.

1) Measure the density of the reference liquid using the liquid density device 26 .

In a state where a solid density reference object 120 such as a silicon square block or silicon sphere of known density is placed on the support plate 24 in the vessel 100 containing the reference liquid, by the operation of the stepper motor 16b When the support plate 24 is lowered, the solid density reference material 120 at this time is naturally placed on the weighing pan 25 suspended on the scale 19 side, and the solid density reference material 120 is weighed. .

The density of the reference liquid is obtained through a known formula using the mass value of the solid density reference material 120 obtained in this way and the previously known density value of the solid density reference material 120 .

2) Calibrate the hydrometer, for example the liquid hydrometer 110 , using the reference liquid lifting device 14 , the metering device 20 and the vision device 23 .

As a preparatory work, hang the hanger hook 29 on the weighing hook 18 of the scale 19, and move the vessel 100 backward by operating the adjustment lever 34 to measure the air mass of the liquid hydrometer. to secure

Using the clamp 130, the liquid hydrometer 110 is hung on the hanger ring 29 to measure the mass M1 in the air of the liquid hydrometer 110, and the liquid hydrometer 110 is removed.

Next, by operating the adjustment lever 34 to move the vessel 100 forward and fix it, the hydrometer 110 is mounted on the clamp 130 .

Then, the vessel 100 is raised through the operation of the reference liquid lifting device 14 so that the liquid hydrometer 110 is immersed in the reference liquid.

At this time, while checking the image of the CCD camera 21 of the vision device 23, the vessel 100 is raised so that the measurement scale of the liquid hydrometer 110 coincides with the water level of the reference liquid.

When the liquid hydrometer 110 is immersed in the reference liquid up to the measurement scale to be calibrated, the mass M2 in the reference liquid of the liquid hydrometer 110 at this time is measured.

Repeat the above process, but while continuously raising and lowering the reference liquid elevating device 14, measure the mass M2 of the reference liquid of the liquid hydrometer 110 at the lower, middle, and upper positions of the liquid hydrometer measurement scale. measure times

In this way, a known calculation formula using the reference liquid mass (M2), the density of the reference liquid, and the air mass (M1) of the liquid hydrometer 110 obtained from the lower, middle, and upper portions of the measurement scale of the liquid hydrometer 110 Calibrate the liquid hydrometer 110 through.

As such, in the present invention, by providing a new reference liquid density measuring device and hydrometer calibrating device in the form of a combination of a reference liquid elevating device, a metering device, a vision device, and a liquid density device, convenience in use and It is possible to secure efficiency and high precision, as well as increase the quality of the calibration and the reliability of the calibration product.

10: body
11: X-axis linear motion
12: Y-axis linear motion
13: lifting plate
14: reference liquid elevating device
15: hanger plate
16a, 16b: stepper motor
17a, 17b: screw drive unit
18 : Waying Hook
19 : scale
20: weighing device
21: CCD camera
22: linear scale
23: vision device
24: support plate
25 : Wei Ying Fan
26: liquid density device
27: mounting hole
28 : Waying Road
29: hook for hanger
30: rack gear
31: lower base block
32: upper slide block
33 : pinion gear
34: operation lever
35: fixed lever
36: slide coupling part
37: upper camera block
38: lower camera block
39: worm wheel
40: worm gear
41: angle operation lever
42: camera angle adjustment device
43: device support frame
44 : wheel
45: stopper
46 : Air tight
47: base frame
48: motor base
49: screw block
50: LM guide
51: fixed plate
52: moving plate
53: screw drive device
54: camera bracket
55: motor frame
56: guide bar
57: plate for fixing the bar
58: pin for support

Claims (5)

a body 10 capable of moving and positioning;
The X-axis linear motion 11 that is installed on the lower inner side of the main body 10 and is movable in the X-axis direction, the Y-axis linear motion 12 that is movable in the Y-axis direction, and the Y-axis linear motion 12 a reference liquid elevating device 14 including an elevating plate 13 for supporting the vessel 100 while being capable of raising and lowering by means of an elevating device;
A hanger plate 15 installed on the inner upper part of the main body to hold the object to be calibrated before and after weighing and to place the object to be calibrated when weighing, and a step motor 16a and a screw for lifting or lowering the hanger plate 15 for weighing a weighing device 20 including a scale 19 for weighing an object to be calibrated while having a driving unit 17a and a weing hook 18;
The distance movement of the CCD camera 21 and the CCD camera 21 that is installed on one side of the reference liquid elevating device 14 in the lower inner part of the main body 10 so that it can rise and fall together and read the scale of the object to be calibrated a vision device 23 comprising a linear scale 22 for
A support plate 24 installed on the vessel 100 of the reference liquid elevating device 14 in the lower inner portion of the body 10 and holding the solid density reference before and after weighing and placing the solid density reference during weighing and weighing For this purpose, a step motor 16b and a screw drive unit 17b for raising or lowering the support plate 24, and a weighing pan 25 for hanging a solid density reference object on the weighing hook 18 side of the scale 19 a liquid density device 26 comprising a;
It includes, and a precision hydrometer calibration device using a solid density reference, characterized in that it can be done together by linking the density measurement of the reference liquid and the calibration of the hydrometer.
The method according to claim 1,
The metering device 20 can be seated or separated in a mounting hole 27 formed in a rhombic shape with a hole in the front formed in the hanger plate 15, and at the same time, the upper end of the weighing hook 18 of the scale 19 is attached to it. It can be hung, and the lower end further includes a hook for a hanger on which the weing rod 28 on which the object to be calibrated is hung can be hung, and depending on whether the hook for the hanger (29) is seated, it holds the object to be calibrated before and after measurement. A precision hydrometer calibration device using a solid density reference, characterized in that it is possible to release the object to be calibrated when weighing.
The method according to claim 1,
The linear scale 22 of the vision device 23 includes a lower base block 31 to which the rack gear 30 is mounted, and an upper slide block 32 capable of moving forward and backward along the lower base block 31 . and an operation lever 34 rotatably coupled to the upper slide block 32 and having a pinion gear 33 meshed with the rack gear 30 , and rotatably coupled to the upper slide block 32 . A precision hydrometer calibration device using a solid density reference, characterized in that it includes at least one fixed lever (35) that can be in contact with the lower base block (31) side through the front end.
4. The method according to claim 1 or 3,
The vision device 23 includes an upper camera block 37 and a lower camera block 38 that are vertically coupled by an arc-shaped slide coupling part 36 while supporting the CCD camera 21, and the upper A half-moon-shaped worm wheel 39 coupled to the bottom of the camera block 37, and a worm gear 40 that is coupled while being inserted into the lower camera block 38 and capable of meshing transmission with the worm wheel 39 ), including an angle operation lever 41 having a, and a precision hydrometer calibration device using a solid density reference, characterized in that it includes a camera angle adjustment device 42 capable of adjusting the vertical angle of the CCD camera 21. .
The method according to claim 1,
The liquid density device 26 is supported on the vessel 100 of the reference liquid elevating device 14 using a ring-shaped device support frame 43 coupled in a detachable structure along the upper edge of the vessel 100 . The center of the support plate 24 of the liquid density device 26 installed in this way is installed in a structure that is A precision hydrometer calibration device using a solid density reference, characterized in that one scale (19) can be used in common when calibrating time and hydrometer.

Images