CN114112790A - Densimeter and method for testing density of battery slurry - Google Patents
Densimeter and method for testing density of battery slurry Download PDFInfo
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- CN114112790A CN114112790A CN202111183671.2A CN202111183671A CN114112790A CN 114112790 A CN114112790 A CN 114112790A CN 202111183671 A CN202111183671 A CN 202111183671A CN 114112790 A CN114112790 A CN 114112790A
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- 239000002002 slurry Substances 0.000 title claims abstract description 66
- 238000012360 testing method Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000007789 sealing Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 27
- 229910052744 lithium Inorganic materials 0.000 abstract description 27
- 238000003756 stirring Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 description 23
- 238000005259 measurement Methods 0.000 description 8
- 239000012530 fluid Substances 0.000 description 6
- 238000007654 immersion Methods 0.000 description 5
- 230000003068 static effect Effects 0.000 description 5
- 239000006257 cathode slurry Substances 0.000 description 4
- 239000011267 electrode slurry Substances 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 239000006256 anode slurry Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000012066 reaction slurry Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 208000019206 urinary tract infection Diseases 0.000 description 1
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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
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Abstract
The invention relates to a densimeter, comprising: top cap, buret, counter weight, location strip, buret upper end is equipped with the opening, and buret is packed into from the opening to the counter weight, and buret bottom is the cone structure, and the top cap is located buret upper end and is used for sealed opening, and buret one side is equipped with the scale mark, and the one side that buret was equipped with the scale mark is located to the location strip, and the top cap is equipped with the slotted hole, and the slotted hole runs through the top cap. The densimeter is used for measuring whether the density of the lithium battery slurry with higher viscosity is uniform or not, is convenient for judging the stirring effect of the slurry and adjusting and optimizing parameters of a stirring process, is simple and convenient to sample when in use, has high measuring speed and small error and is high in accuracy, and is suitable for quickly obtaining the density data of the high-viscosity slurry in real time. The invention also relates to a method for testing the density of the battery slurry.
Description
Technical Field
The invention relates to the field of lithium battery slurry, in particular to a densimeter and a method for testing the density of the battery slurry.
Background
The pole piece manufacturing process is the core content of the whole lithium ion battery manufacturing, and is related to the electrochemical performance of the battery, and the property of the slurry directly influences the performance of the lithium ion battery. The lithium ion battery slurry is a non-Newtonian fluid, and the slurry is a highly suspended system formed by mixing and dispersing solid powder and liquid, and has the typical characteristics of the non-Newtonian fluid.
The density of the slurry is an important parameter for the consistency of the reaction slurry, the dispersion effect of the slurry can be verified by testing the density of the slurry at different positions, and when the slurry is well dispersed, the density of the slurry at each position is uniform. The density meter is usually used in a float type, static pressure type, vibration type, radioisotope type, etc. The measurement principle of the float-type densimeter is the Archimedes principle, the structure is simplest, the floats with different measuring ranges are often used in a matched manner during measurement, and the defect is that a plurality of floats are troublesome to replace during use; the densimeter utilizing the principle also comprises a digital display balance densimeter, and the density of the liquid to be measured is converted by measuring the difference value of the gravity of the standard block in the air and the liquid to be measured through a balance; the static pressure type and vibration type liquid densitometers are respectively manufactured by utilizing the principle that the pressure intensity and the vibration characteristic of liquid are related to the density of the liquid, but the error is larger when high-viscosity liquid is tested, particularly high-viscosity lithium battery slurry with bubbles; the radioactive isotope type densimeter has a great hidden danger to the safety of human body because of having radioactive source. The density of high viscosity lithium battery slurry can not be simply, rapidly and accurately measured by the existing densimeter, and when the density of different positions of the high viscosity lithium battery slurry is tested to verify the slurry dispersion effect, the floater or the standard part needs to be adjusted for many times, so that the operation flow is complicated.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the densimeter and the test method of the density of the battery slurry, the densimeter is used for measuring whether the density of the lithium battery slurry with higher viscosity is uniform or not, and the judgment on the slurry stirring effect and the parameter adjustment and optimization on the stirring process are facilitated. The densimeter is simple and convenient to operate when in use, high in measuring speed and small in measuring error, and is suitable for rapidly acquiring density data of high-viscosity slurry in real time.
In one aspect, the present invention provides a densitometer comprising: top cap, buret, counterweight, location strip, buret upper end is equipped with the opening, the counterweight is followed the opening is put in buret, the buret bottom is the cone structure, the top cap is located buret upper end is used for sealing the opening, buret one side is equipped with the scale mark, the location strip is located buret is equipped with one side of scale mark, the top cap is equipped with the slotted hole, the slotted hole runs through the top cap.
Further, one side, where the measuring tube is provided with the scale marks, is longitudinally provided with a groove, the positioning strip is arranged in the groove, and the counterweight and the positioning strip are separated by the groove, so that the counterweight and the positioning strip are ensured not to interfere with each other.
Further, the bottom end of the groove is aligned with the scale mark at the lowest position, and the arrangement is such that the lower limit of the positioning bar coincides with the scale mark at the lowest position.
Furthermore, the position of the groove corresponds to the shape of the slotted hole, the shape of the slotted hole corresponds to the shape of the top end of the positioning strip, and the positioning strip can move longitudinally by the arrangement, so that the positioning strip can be positioned on the scale mark.
Further, the positioning strip is of a cylinder structure, preferably, the positioning strip is any one of a cylindrical cylinder and a polygonal cylinder, and the positioning strip is simple in structure and convenient to machine and form.
Further, the location strip longitudinal sliding, location strip bottom location is in on the scale mark, location strip top is passed the slotted hole is located the top cap top, the setting up of slotted hole not only does benefit to the slip of location strip is fixed a position, still is favorable to the taking out and the change of location strip.
Furthermore, the scale marks are arranged on the pipe wall of the measuring pipe between the opening of the measuring pipe and the cone structure, and the position of the scale marks is convenient for an operator to read scale values.
Further, the top cover is provided with a thread structure, and the thread structure is beneficial to enhancing the sealing effect of the top cover.
In another aspect, the present invention provides a method for testing the density of battery paste, using the densitometer, comprising the steps of:
s1: the scale marks have corresponding scale values, a corresponding relation table of the scale values and the density value of the battery slurry is established, and the number of the counter weights and the scale value range are determined;
s2: loading the weight into the burette according to the battery slurry composition characteristic to be measured, positioning the positioning bar at a highest graduation line;
s3: placing the densitometer in the battery slurry, and reading the scale value after the densitometer is stationary;
s4: searching the density value of the battery slurry corresponding to the scale value to obtain the density value of the battery slurry;
s5: and positioning the positioning strip to the scale value, placing the densimeter at different positions of the battery slurry, and judging the density uniformity of the battery slurry through the positioning strip.
Compared with the prior art, the invention has at least the following beneficial effects:
1. the operation is simple and convenient, and the measuring speed is high. The design of toper structure can make the densimeter get into high viscosity lithium cell thick liquids fast in, the densimeter can use simple operation in placing the thick liquids that await measuring.
2. And rapidly acquiring the density data of the high-viscosity slurry in real time. The setting of location strip can be judged fast whether the density of lithium cell thick liquids different positions is unanimous, the homogeneity of quick judgement lithium cell thick liquids density, and then makes the judgement and makes parameter adjustment and optimization to the stirring technology to thick liquids stirring effect.
3. The error is little, and measurement accuracy is high. In the density test of the battery slurry, firstly, a corresponding relation table of scale values and density is established, the relation among the number of the counter weights, the scale values and the density is established in the relation table, the number of the counter weights is determined, and then the test range of the densimeter is also determined, namely, the measurement range of the densimeter can be accurately regulated and controlled by adjusting the number of the counter weights, so that the test range of the densimeter meets the actual test requirement, the test accuracy of the densimeter is improved, and in the test process, the accurate density value can be obtained through the relation table after the scale values are read.
Drawings
The figures further illustrate the invention, but the examples in the figures do not constitute any limitation of the invention.
FIG. 1 is a schematic structural view of a densitometer provided by the present invention;
FIG. 2 is a schematic diagram of a densitometer top cover structure provided by the present invention;
FIG. 3 is a schematic view of a densitometer tube structure provided by the present invention.
Wherein the reference numerals are: a top cover-1, a slot-11, a burette-2, a groove-21, a counterweight-3 and a positioning strip-4.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 to 3, an embodiment of the present invention provides a densitometer including: top cap 1, buret 2, counter weight 3, location strip 4, buret 2 upper end is equipped with the opening, and buret 2 is loaded into from the opening to counter weight 3, and 2 bottoms of buret are the cone structure, and top cap 1 is located 2 upper ends of buret and is used for sealed opening, and buret 2 one side is equipped with the scale mark, and one side that buret 2 was equipped with the scale mark is located to location strip 4, and top cap 1 is equipped with slotted hole 11, and slotted hole 11 runs through top cap 1.
The bottom of the measuring tube 2 is a cone, the design of the cone can reduce the resistance of the densimeter when the densimeter enters the high-viscosity lithium battery slurry, the speed of the densimeter entering the high-viscosity lithium battery slurry is favorably improved, and the time required by the density test is reduced. The top cap 1 is used for sealing the opening of buret 2 upper end, and top cap 1 is the helicitic texture, and the leakproofness between top cap 1 and buret 2 has been strengthened to the design of helicitic texture, avoids the densimeter to arouse in the use that counter weight 3 breaks away from buret 2 because of top cap 1 drops.
The density of the counterweight 3 is large, so that the gravity center of the densimeter is more stable, the densimeter is in a floating state and can be erected in water, and the reading is convenient.
The pipe wall between the opening of the measuring pipe 2 and the cone is provided with scale marks, and the position arrangement of the scale marks is beneficial for an operator to read scale values. The scale value close to one end of the cone is small, the scale value close to one end of the opening is large, namely the scale value is large at the upper part and small at the lower part, the scale mark with the largest scale value is the highest-order scale mark, and the scale mark with the smallest scale value is the lowest-order scale mark. Be equipped with the recess 21 corresponding with location strip 4 in one side of buret 2 scale mark, location strip 4 sets up in recess 21, and the setting of recess 21 not only is convenient for fix location strip 4, can also separate counter weight 3 and location strip 4, has guaranteed counter weight 3 and location strip 4 mutual noninterference. The bottom end of the groove 21 is aligned with the lowermost scale line, which enables the lower limit of positioning of the positioning bar 4 to coincide with the lowermost scale line. The location strip 4 is the cuboid in this embodiment, and the cuboid simple structure makes things convenient for the machine-shaping. The shape of the slotted hole 11 of the top cover 1 is square corresponding to the shape of the top end of the positioning strip 4, the position of the slotted hole 11 corresponds to the groove 21, the positioning strip 4 can move in the longitudinal direction, the bottom end of the positioning strip 4 plays a role in positioning, when the positioning strip 4 moves, the bottom end of the positioning strip 4 is positioned between the lowest position scale mark and the highest position scale mark, and the top end of the positioning strip 4 penetrates through the slotted hole 11 on the top cover 1 and is positioned above the top cover 1. The groove 21 and the slot 11 are designed such that the positioning range of the positioning bar 4 is between the lowest order graduation line and the highest order graduation line.
The materials used for manufacturing the densitometer component in the invention comprise metal, plastic and glass.
The densimeter provided by the invention can be used after being placed in the slurry to be tested, and is simple to operate; the setting of location strip can be judged fast whether the density of lithium cell thick liquids different positions is unanimous, the homogeneity of quick judgement lithium cell thick liquids density, and then makes the judgement and makes parameter adjustment and optimization to the stirring technology to thick liquids stirring effect.
A method for testing the density of battery slurry comprises the following steps of using the densimeter:
s1: the scale marks have corresponding scale values, a corresponding relation table of the scale values and the density value of the battery slurry is established, and the number of the counter weights and the scale value range are determined;
the measurement principle of the densitometer of the invention is the Archimedes principle, i.e. the body immersed in a stationary fluid (gas or liquid) is subjected to a buoyancy force equal in magnitude to the bodyThe weight of the fluid displaced by the body is directed vertically upwards and through the centroid of the displaced fluid, i.e. FFloating body＝GLiquid drainage＝mLiquid drainageg＝gVRow boardρLiquid for treating urinary tract infection(VRow boardThe volume of liquid displaced by the object). In this example, m1Mass (g) of the top cover 1, s: cross-sectional area (cm) of tip of burette 22)，m2: mass (g), d) of burette 21: outer diameter (cm), m of burette 23: mass (g) of the counterweight 3. h is1: distance (cm), h from the highest position scale line to the top end of the burette2: distance (cm), h from the highest to the lowest scale mark3: distance (cm), h from the lowest scale line to the top of the cone4: height (cm) of the cone. V0: volume of cone (cm)3)，d2: the width (cm) of the positioning strip 4, h is the immersion depth (cm) of the densitometer when immersed in the fluid at rest, n is the number of counterweights, then (m)1+m2+nm3)g＝ρg(hs+V0-(h-h3)d2 2) I.e. the density value versus immersion depth is:
and obtaining the density value corresponding to the scale value through calculation.
In this embodiment, the immersion depth h is a scale value, which is large at the top and small at the bottom. When m is1＝2g，m2＝10g，m3＝5g，d1＝1.5cm，d2＝0.2cm，h4＝1cm，h3＝3cm，h1When n is 1, 2 and 3, the relationship between scale value and density value is shown in table 1.
TABLE 1 corresponding table of scale values and densities
The scale range can be adjusted by adding the balance weight in the densimeter, so that the test range of the density can be adjusted, and according to the data in the table 1, the scale value of h is between 3 and 9, the unit scale value is 0.1, 9 is the scale value of the highest scale mark, and 3 is the scale value of the lowest scale mark. When a counterweight is put into the densimeter, the measurable range of the corresponding density value is about 1.0-2.9; the measurable range of density values for two weights is about 1.4-3.7, and the measurable range of density values for three weights is about 1.7-4.6. The density of the lithium battery slurry ranges from 1 to 4.5g/cm3The density test ranges in table 1 above have included the density ranges for lithium battery slurries. In densitometers, m1、m2、d1、d2、h3、h4Is fixed, and n and m3The value of (b) can be adjusted correspondingly according to the nature of the actual sample to be measured, namely the immersion depth h is influenced by the quality and the quantity of the weights, and the immersion depth h can be adjusted by the weights.
S2: according to the battery slurry component characteristics to be measured, a counterweight is loaded into the burette, and the positioning bar is positioned at the position of the highest scale mark;
and according to the corresponding relation table of the scale value and the density, the density of the lithium battery slurry can be tested after the number of the counter weights and the scale value range are determined.
In the density test of the lithium battery cathode slurry, a top cover with a threaded structure is unscrewed, a weight with the mass of 5g is loaded into a burette, the scale value is 3-9, the unit scale value is 0.1, the scale value is large in the upper part and small in the lower part, the bottom end of a positioning strip is moved to a scale mark with the scale value of 9, and the test range of a densimeter is about 1.0-2.9 at the moment.
In the density test of the lithium battery anode slurry, because the anode slurry has higher density and the density difference among different formulas is also larger, therefore, when the density is measured, the number of the counterweight balls needs to be adjusted, the top cover with the threaded structure is unscrewed, two counterweights with the mass of 5g are firstly loaded into the densimeter, the scale value is 3-9, the unit scale value is 0.1, the scale value is large and small, the bottom end of the positioning strip is moved to the scale mark with the scale value of 9, the testing range of the densimeter is about 1.4-3.7, at the moment, if the slurry liquid level is found to be below the lowest scale mark after the densimeter is static, the situation that the added counterweights are insufficient is shown, so that the densimeter is not in the proper measuring range, then taking out the densimeter and adding a weight with the mass of 5g to increase the density testing range, wherein 3 weight balls are added into the densimeter, and the testing range of the densimeter is about 1.7-4.6.
S3: placing the densimeter in the battery slurry, and reading a scale value after the densimeter is static;
the density meter is placed into lithium battery slurry to test the density of the lithium battery slurry, the density of the counterweight is high, the density meter is in a floating state due to the counterweight ball added into the density meter and can be erected in water, the density meter can read when stopping moving up and down and being in a static state, and during reading, the sight line is kept horizontal with the slurry liquid level to read scale values.
S4: searching the density value of the battery slurry corresponding to the scale value to obtain the density value of the battery slurry;
after the scale value is read, the corresponding density value is searched in the table 1 according to the scale value and the number of the counter weights added into the densimeter, and the density value of the battery slurry can be obtained.
In the density test of the lithium battery negative electrode slurry, a weight with the mass of 5g is added into a densimeter, when the read scale value is 3, the density value of the lithium battery negative electrode slurry is 2.887473, when the read scale value is 6.9, the corresponding density value is 1.347081, and when the read scale value is 9, the corresponding density value is 1.046476.
In the density test of the lithium battery negative electrode slurry, two counter weights with the mass of 5g are added into a densimeter, when the read scale value is 3, the density value of the lithium battery negative electrode slurry is 3.73673, when the read scale value is 3.8, the corresponding density value is 3.026759, and when the read scale value is 9, the corresponding density value is 1.354263; the densimeter is added with three counter weights with the mass of 5g, when the read scale value is 3, the density value of the lithium battery cathode slurry is 4.585987, when the read scale value is 5.1, the corresponding density value is 2.838333, and when the read scale value is 9, the corresponding density value is 1.66205.
S5: and positioning the positioning strips to scale values, placing the densimeter at different positions of the battery slurry, and judging the uniformity of the density of the battery slurry through the positioning strips.
After the density value of the anode slurry or the cathode slurry of the lithium battery is measured, the densimeter is taken out, the bottom end of the positioning strip is moved down to a reading position, the surface slurry of the densimeter is wiped clean, the densimeter is placed at different positions in the slurry, and whether the density of each position of the cathode slurry of the lithium battery is the same or not can be judged quickly by observing the position relation of the liquid level of the slurry and the scale mark at the bottom end of the positioning strip.
The invention provides a method for testing density of battery slurry, which comprises the steps of firstly establishing a corresponding relation table of scale values and density in the battery slurry density test, already establishing the relation among the number of counter weights, the scale values and the density in the relation table, and determining the test range of a densimeter when the number of the counter weights is determined, namely, the measurement range of the densimeter can be accurately regulated and controlled by adjusting the number of the counter weights, so that the test range of the densimeter meets the actual test requirement, the test accuracy of the densimeter is improved, and the accurate density value can be obtained through the relation table after the scale values are read in the test process. The method has small measurement error and high measurement accuracy.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A densitometer characterized by: including top cap, buret, counterweight, location strip, buret upper end is equipped with the opening, the counterweight is followed the opening is put in buret, buret bottom is the cone structure, the top cap is located buret upper end is used for sealing the opening, buret one side is equipped with the scale mark, the location strip is located buret is equipped with one side of scale mark, the top cap is equipped with the slotted hole, the slotted hole runs through the top cap.
2. The densitometer of claim 1, wherein: one side of the burette, which is provided with the scale marks, is longitudinally provided with a groove, and the positioning strip is arranged in the groove.
3. The densitometer of claim 2, wherein: the bottom end of the groove is aligned with the scale mark at the lowest position.
4. The densitometer of claim 2, wherein: the position of the groove corresponds to the groove hole, and the shape of the groove hole corresponds to the shape of the top end of the positioning strip.
5. The densitometer of claim 1, wherein: the positioning strip is of a cylinder structure.
6. The densitometer of claim 1, wherein: the positioning strip slides longitudinally, the bottom end of the positioning strip is positioned on the scale mark, and the top end of the positioning strip penetrates through the slotted hole and is positioned above the top cover.
7. The densitometer of claim 1, wherein: the scale marks are arranged on the pipe wall of the measuring pipe between the opening of the measuring pipe and the cone structure.
8. The densitometer of claim 1, wherein: the top cover is provided with a thread structure.
9. A method for testing the density of battery slurry is characterized in that: the test is carried out using the densitometer of any of claims 1-8.
10. The method for testing the density of the battery slurry according to claim 9, wherein: the method comprises the following steps:
s1: the scale marks have corresponding scale values, a corresponding relation table of the scale values and the density value of the battery slurry is established, and the number of the counter weights and the scale value range are determined;
s2: loading the weight into the burette according to the battery slurry composition characteristic to be measured, positioning the positioning bar at a highest graduation line;
s3: placing the densitometer in the battery slurry, and reading the scale value after the densitometer is stationary;
s4: searching the density value of the battery slurry corresponding to the scale value to obtain the density value of the battery slurry;
s5: and positioning the positioning strip to the scale value, placing the densimeter at different positions of the battery slurry, and judging the density uniformity of the battery slurry through the positioning strip.
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| CN108169065A (en) * | 2017-12-18 | 2018-06-15 | 中国航发贵州黎阳航空动力有限公司 | A kind of densitometer and measuring method for being used to measure fluid density |
| CN211148342U (en) * | 2019-11-25 | 2020-07-31 | 上海宝冶市政工程有限公司 | Mud ratio weight meter |
| CN111855486A (en) * | 2020-06-29 | 2020-10-30 | 广西壮族自治区森林资源与生态环境监测中心 | Device and method for automatically measuring liquid density |
| CN213714989U (en) * | 2020-12-21 | 2021-07-16 | 许可 | Densimeter with adjustable balance weight |
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