CN111443010A - Liquid specific gravity measuring device - Google Patents
Liquid specific gravity measuring device Download PDFInfo
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- CN111443010A CN111443010A CN202010315272.6A CN202010315272A CN111443010A CN 111443010 A CN111443010 A CN 111443010A CN 202010315272 A CN202010315272 A CN 202010315272A CN 111443010 A CN111443010 A CN 111443010A
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- Prior art keywords
- measuring rod
- measuring
- displacement sensor
- hole
- specific gravity
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- 239000007788 liquid Substances 0.000 title claims abstract description 56
- 230000005484 gravity Effects 0.000 title claims abstract description 27
- 238000006073 displacement reaction Methods 0.000 claims abstract description 54
- 239000011521 glass Substances 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 9
- 208000019206 urinary tract infection Diseases 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 210000001635 urinary tract Anatomy 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/10—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by observing bodies wholly or partially immersed in fluid materials
- G01N9/12—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by observing bodies wholly or partially immersed in fluid materials by observing the depth of immersion of the bodies, e.g. hydrometers
- G01N9/18—Special adaptations for indicating, recording, or control
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention discloses a liquid specific gravity measuring device which comprises a measuring platform fixed on the side wall of a container, wherein a first through hole and a second through hole are formed in the measuring platform, a first measuring rod and a second measuring rod which are identical in length and cross section respectively extend into the measured liquid from top to bottom through the first through hole and the second through hole and are freely suspended in the measured liquid, a first displacement sensor and a second displacement sensor which are used for detecting up and down movement are respectively arranged beside the first through hole and the second through hole, the weight of the first measuring rod is 1.5-3 times of that of the second measuring rod, the first displacement sensor and the second displacement sensor are in signal connection with a P L C control module, and the P L C control module comprises a data acquisition unit, a central processing unit, a storage unit, a power supply unit and a display input unit.
Description
Technical Field
The present invention relates to a specific gravity measuring apparatus, and more particularly, to an apparatus for measuring the specific gravity of a liquid in real time.
Background
In the chemical industry, it is often necessary to accurately measure the specific gravity of a mixed liquid in a reaction tank to determine reaction conditions. Most of devices for accurately measuring the specific gravity of the liquid in the prior art are expensive, cannot display the specific gravity in real time, and are complex to operate.
CN105372152 discloses an alcohol specific gravity measuring instrument, which comprises a glass specific gravity meter, a grating ruler sensor and a measuring and controlling system. However, in this scheme, zero adjustment is required before measurement, and the system efficiency is low.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
In order to achieve the objects and other advantages according to the present invention, there is provided a liquid specific gravity measuring apparatus, comprising a measuring platform fixed on a side wall of a container, the measuring platform being parallel to an upper surface of a measured liquid, the measuring platform being provided with a first through hole and a second through hole, a first measuring rod and a second measuring rod having the same length and cross section and extending into the measured liquid from top to bottom through the first through hole and the second through hole respectively and being suspended freely in the measured liquid, a first displacement sensor for detecting up and down movement of the first measuring rod being provided beside the first through hole, a second displacement sensor for detecting up and down movement of the second measuring rod being provided beside the second through hole, the weight of the first measuring rod being 1.5 to 3 times the weight of the second measuring rod, the first displacement sensor and the second displacement sensor being signal-connected to a P L C control module, the P L C control module comprising a data acquisition unit, a central processing unit, a storage unit, a power supply unit and a display input unit.
Preferably, the first displacement sensor is a first grating ruler displacement sensor, scale gratings of the first grating ruler displacement sensor are vertically distributed on the first measuring rod, and a grating reading head of the first grating ruler displacement sensor is arranged beside the first through hole; the second displacement sensor is a second grating ruler displacement sensor, scale gratings of the second grating ruler displacement sensor are vertically distributed on the second measuring rod, and a grating reading head of the second grating ruler displacement sensor is arranged beside the second through hole
Preferably, the first measuring rod and the second measuring rod are the same cylinder or a polygon prism.
Preferably, the material of the first measuring rod and the second measuring rod is polytetrafluoroethylene or glass.
Preferably, the first measuring rod and the second measuring rod are hollow inside.
Preferably, the topmost ends of the first measuring rod and the second measuring rod are provided with stoppers.
Preferably, wherein the weight of the first measuring stick is 2 times the weight of the second measuring stick.
Preferably, the display input unit is a handwriting display screen.
The invention at least has the following beneficial effects that as the displacement sensors are adopted to accurately measure the displacement of the first measuring rod and the second measuring rod, and the P L C system is used for data acquisition and operation, the real-time accurate measurement of the specific gravity of the liquid can be realized, and the working efficiency is greatly improved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic structural diagram of one embodiment of the present invention;
FIG. 2 is a schematic view of a measurement rod displacement measurement scheme in accordance with an embodiment of the present invention;
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
FIG. 1 shows an implementation form of the present invention, which includes a measuring platform 2 fixed on a sidewall of a container 1, wherein the measuring platform 2 is parallel to an upper surface of a measured liquid, the measuring platform 2 is provided with a first through hole 3 and a second through hole 4, a first measuring rod 5 and a second measuring rod 6 with the same length and cross section respectively extend into the measured liquid from top to bottom through the first through hole 3 and the second through hole 4 and freely suspend in the measured liquid, a first displacement sensor 7 for detecting the up-and-down movement of the first measuring rod 5 is arranged beside the first through hole 3, a second displacement sensor 8 for detecting the up-and-down movement of the second measuring rod 6 is arranged beside the second through hole 4, the weight of the first measuring rod 5 is 1.5-3 times of the weight of the second measuring rod 6, the first displacement sensor 7 and the second displacement sensor 8 are in signal connection with a P L C control module, and the P L C control module includes a data acquisition unit, a central processing unit, a storage unit, a power supply unit and a display unit.
According to the technical scheme, the device comprises the following steps that as shown in fig. 1, liquid to be measured is placed in a container 1, a first measuring rod 5 and a second measuring rod 6 respectively extend into the liquid to be measured from top to bottom through a first through hole 3 and a second through hole 4 and freely suspend in the liquid to be measured, a first displacement sensor 7 detects the upward displacement of the first measuring rod 5 in real time and transmits the upward displacement to a data acquisition unit of a P L C control module, a second displacement sensor 8 detects the upward displacement of the second measuring rod 6 in real time and transmits the upward displacement to a data acquisition unit of a P L C control module, a storage unit of the P L C control module stores data acquired by the data acquisition unit, and a central processing unit calculates the displacements of the first measuring rod 5 and the second measuring rod 6 and outputs liquid specific gravity values to a display input unit for display.
The specific operation formula is as follows:
according to archimedes' law: the buoyancy of an object immersed in a stationary liquid under the action of the liquid is equal to the gravity of the liquid displaced by the object, with the direction of the buoyancy being vertically upward.
Namely: fFloating body＝G＝ρLiquid for treating urinary tract infection·g·VRow boardThe following can be obtained: vRow board＝G/(ρLiquid for treating urinary tract infection·g)
The volume of liquid displaced by the cylinder or column in the liquid may also be the floor area multiplied by the height of immersion in the liquid: vRow board＝S·h
VRow board＝S·h＝G/(ρLiquid for treating urinary tract infectionG) available: h is G/(ρ)Liquid for treating urinary tract infection·g·S)
The first and second measuring bars have the same length L and cross-section S, but the weight G of the first measuring bar1Is a second measuring rod G21.5 to 3 times of the weight of the liquid, so that the first measuring rod and the second measuring rod are immersed in the liquid to a height h1、h2And also different.
The following can be obtained: h is1-h2＝(G1-G2)/(ρLiquid for treating urinary tract infection·g·S)
Then: rhoLiquid for treating urinary tract infectionThe specific gravity of the liquid can be determined by Δ G/(Δ h · G · S), that is, the difference in weight between the first measurement bar and the second measurement bar, the height difference of the liquid immersed in the liquid, and the bottom area.
As shown in fig. 2, because the first and second measuring rods have the same length L, the difference in height of the first and second measuring rods immersed in the liquid can be obtained by measuring the difference in the amount of upward displacement of the first and second measuring rods suspended in the liquid.
Δh＝h1-h2＝(L-h11)-(L-h21)＝h21-h11
In another example, the first displacement sensor 7 is a first grating ruler displacement sensor, scale gratings of the first grating ruler displacement sensor 7 are vertically distributed on the first measuring rod 5, and a grating reading head of the first grating ruler displacement sensor 7 is arranged beside the first through hole 3;
the second displacement sensor 8 is a second grating ruler displacement sensor, the scale grating of the second grating ruler displacement sensor 8 is vertically distributed on the second measuring rod 6, and the grating reading head of the second grating ruler displacement sensor 8 is arranged beside the second through hole 4. Also, this manner is merely an illustration of a preferred example, but not limited thereto. When the invention is implemented, other displacement sensor implementation modes can be selected according to the requirements of a user.
One implementation manner of the first measuring rod 5 and the second measuring rod 6 in the above scheme is as follows: the first measuring rod 5 and the second measuring rod 6 are the same cylinder or polygon prism. By adopting the scheme, the measuring rod can be simply processed and finished, and the production cost is reduced.
One implementation manner of the first measuring rod 5 and the second measuring rod 6 in the above scheme is as follows: the first measuring rod 5 and the second measuring rod 6 are made of polytetrafluoroethylene or glass. By adopting the scheme, the measuring rod has stronger chemical stability, is not easy to react with the measured liquid, and avoids polluting the measured liquid.
One implementation manner of the first measuring rod 5 and the second measuring rod 6 in the above scheme is as follows: the first measuring rod 5 and the second measuring rod 6 are hollow inside. By adopting the scheme, the first measuring rod 5 and the second measuring rod 6 can add balance weights into the hollow inner part, so that the self weight can be adjusted according to the measurement requirements of liquids with different specific gravities, and the measurement range is further expanded.
One implementation manner of the first measuring rod 5 and the second measuring rod 6 in the above scheme is as follows: and the topmost ends of the first measuring rod 5 and the second measuring rod 6 are provided with a limiting stopper 9. With this solution, the first measuring stick 5 and the second measuring stick 6 can be protected from touching the bottom of the container 1 in case of low liquid levels.
One implementation manner of the first measuring rod 5 and the second measuring rod 6 in the above scheme is as follows: the weight of the first measuring rod is 2 times of that of the second measuring rod. By adopting the scheme, the processing of the measuring rod and the calculation of the specific gravity are simpler and more convenient.
One implementation manner of the display input unit in the above scheme is as follows: the display input unit is a handwriting display screen. By adopting the scheme, the specific gravity of the liquid can be simply and reliably displayed in real time, and the weight and the bottom area of the measuring rod are arranged through the handwriting display screen.
As described above, according to the present invention, since the displacement sensors are used to accurately measure the displacement of the first measuring rod and the second measuring rod, and the P L C system is used to perform data acquisition and calculation, the real-time accurate measurement of the specific gravity of the liquid can be realized, and the working efficiency is greatly improved.
While embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.
Claims (8)
1. A liquid specific gravity measuring device is characterized by comprising a measuring platform fixed on the side wall of a container, wherein the measuring platform is parallel to the upper surface of a measured liquid, a first through hole and a second through hole are formed in the measuring platform, a first measuring rod and a second measuring rod which are identical in length and cross section respectively extend into the measured liquid from top to bottom through the first through hole and the second through hole and are freely suspended in the measured liquid, a first displacement sensor used for detecting the up-and-down movement of the first measuring rod is arranged beside the first through hole, a second displacement sensor used for detecting the up-and-down movement of the second measuring rod is arranged beside the second through hole, the weight of the first measuring rod is 1.5-3 times of that of the second measuring rod, the first displacement sensor and the second displacement sensor are in signal connection with a P L C control module, and the P L C control module comprises a data acquisition unit, a central processing unit, a storage unit, a power supply unit and a display input unit.
2. The liquid specific gravity measuring device according to claim 1, wherein the first displacement sensor is a first grating scale displacement sensor, a scale grating of the first grating scale displacement sensor is vertically distributed on the first measuring rod, and a grating reading head of the first grating scale displacement sensor is arranged beside the first through hole;
the second displacement sensor is a second grating ruler displacement sensor, scale gratings of the second grating ruler displacement sensor are vertically distributed on the second measuring rod, and a grating reading head of the second grating ruler displacement sensor is arranged beside the second through hole.
3. The liquid specific gravity measuring device according to claim 1, wherein the first measuring rod and the second measuring rod are the same cylinder or a polygonal prism.
4. The liquid specific gravity measuring device according to claim 1, wherein the first measuring rod and the second measuring rod are made of polytetrafluoroethylene or glass.
5. The liquid specific gravity measuring device according to claim 4, wherein the first measuring rod and the second measuring rod are hollow inside.
6. The liquid specific gravity measuring device according to claim 1, wherein the first measuring rod and the second measuring rod are provided at the uppermost ends thereof with stoppers.
7. The liquid specific gravity measuring device according to claim 1, wherein the weight of the first measuring stick is 2 times the weight of the second measuring stick.
8. The liquid specific gravity measuring device according to claim 1, wherein the display input unit is a handwriting display screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010315272.6A CN111443010A (en) | 2020-04-21 | 2020-04-21 | Liquid specific gravity measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010315272.6A CN111443010A (en) | 2020-04-21 | 2020-04-21 | Liquid specific gravity measuring device |
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| Publication Number | Publication Date |
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| CN111443010A true CN111443010A (en) | 2020-07-24 |
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| CN202010315272.6A Pending CN111443010A (en) | 2020-04-21 | 2020-04-21 | Liquid specific gravity measuring device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5791187A (en) * | 1995-07-10 | 1998-08-11 | Changmin Co., Ltd. | Level measurement method using measurements of water column pressure therefor |
| CN105372152A (en) * | 2015-12-09 | 2016-03-02 | 曲阜师范大学 | Alcohol specific gravity measuring device |
| CN105675437A (en) * | 2015-12-29 | 2016-06-15 | 长沙学院 | Displacement difference solution density measuring equipment and measuring equipment thereof |
| CN206469934U (en) * | 2017-02-08 | 2017-09-05 | 深圳市宏电技术股份有限公司 | A kind of device of on-line measurement fluid density and liquid level |
| CN212206984U (en) * | 2020-04-21 | 2020-12-22 | 杭州开宇环保科技有限公司 | Liquid specific gravity measuring device |
-
2020
- 2020-04-21 CN CN202010315272.6A patent/CN111443010A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5791187A (en) * | 1995-07-10 | 1998-08-11 | Changmin Co., Ltd. | Level measurement method using measurements of water column pressure therefor |
| CN105372152A (en) * | 2015-12-09 | 2016-03-02 | 曲阜师范大学 | Alcohol specific gravity measuring device |
| CN105675437A (en) * | 2015-12-29 | 2016-06-15 | 长沙学院 | Displacement difference solution density measuring equipment and measuring equipment thereof |
| CN206469934U (en) * | 2017-02-08 | 2017-09-05 | 深圳市宏电技术股份有限公司 | A kind of device of on-line measurement fluid density and liquid level |
| CN212206984U (en) * | 2020-04-21 | 2020-12-22 | 杭州开宇环保科技有限公司 | Liquid specific gravity measuring device |
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