CN113504150B - Dynamic detector for specific gravity of liquid and dynamic detection method - Google Patents
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- 239000007788 liquid Substances 0.000 title claims abstract description 118
- 238000001514 detection method Methods 0.000 title claims abstract description 46
- 230000005484 gravity Effects 0.000 title claims abstract description 33
- 238000005303 weighing Methods 0.000 claims abstract description 24
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
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- 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 the technical field of liquid specific gravity meters, in particular to a liquid specific gravity dynamic detector and a dynamic detection method, wherein the liquid specific gravity dynamic detector comprises a weighing sensor, a measuring block, a connecting piece and a container, wherein a distance adjusting device is arranged towards the container by the weighing sensor; meanwhile, dynamic measurement is carried out in a mode based on the density of the measuring block, the density of the connecting piece and the accuracy of the cross section, so that the production difficulty of the measuring block and the connecting piece serving as reference pieces is effectively solved, and the generation of errors caused by the change of the height of the liquid level is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of liquid specific gravity meters, and particularly relates to a liquid specific gravity dynamic detector and a dynamic detection method.
Background
The specific gravity of the measured liquid is generally obtained by dividing the measured buoyancy (weight difference) by the displaced volume according to archimedes' principle by using a buoyancy method and a displacement method.
In some dynamic measurement of the specific gravity of low-velocity flowing liquid (such as urine specific gravity), the change of the specific gravity of the liquid can be dynamically detected in real time as the liquid continuously flows in at a low velocity and the liquid in the container is continuously replaced. Therefore, in the dynamic measurement of the specific gravity of the liquid, the existing high-precision weighing sensor can easily obtain the accurate mass value of the replaced liquid, and the replaced volume can only depend on the accurate control of the volume of the replaced weight, and the volume of the suspended weight connecting rod or the suspended rope immersed in the liquid is reduced so as to improve the accuracy of the replaced volume value.
In addition, in practical applications, the liquid does not directly overflow the container rim smoothly, and the liquid can obviously raise the whole liquid level due to surface tension. With the inflow of the liquid, after the liquid level is accumulated to a certain degree above the edge, the balance of force is broken, the liquid flows out from the edge of the container, potential energy is accumulated again, and the liquid level is repeatedly circulated, so that the liquid level continuously fluctuates greatly, and the accuracy of calculating the specific gravity of the liquid is reduced.
In some dynamic measurement of liquid specific gravity, the weight and the container are often used as consumable materials, namely, the weight is recovered or discarded after the use is completed, so that the volume precision of the weight is improved, and the cost of the consumable materials is greatly improved by avoiding fluctuation of the liquid level of the container through a complex structure.
Therefore, there is an urgent need for a method of dynamically observing the specific gravity of a liquid and an apparatus therefor, which can improve the measurement accuracy and reduce the production cost of consumables.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to solve the problem of realizing a method for a dynamic liquid densitometer based on low-cost consumable materials.
2. Technical proposal
In order to achieve the above purpose, the technical scheme provided by the invention is as follows: the utility model provides a liquid proportion dynamic detector, includes weighing sensor, measuring block, connecting piece and container, its characterized in that: one end of the connecting piece is connected with a weighing sensor, and the other end of the connecting piece is connected with the measuring block;
the measuring block extends into the container to be suspended;
the load cell is provided with a distance adjusting device towards the container.
The edge of the container is provided with a concave liquid guide port, the liquid guide port is used for overflowing liquid in the container, the side edge of the liquid guide port extends outwards from the container to be provided with a guide plate, and the drainage surface of the guide plate is connected with the inner wall of the container above the bottom edge of the liquid guide port in a direction and extends to the outer wall of the container below the bottom edge of the liquid guide port.
Preferably, the side wall of the container is arranged in a curved surface, and the drainage surface of the guide plate is tangential to the inner wall of the container.
Preferably, the liquid guiding ports are provided with a plurality of liquid guiding ports, and different liquid guiding ports are provided with one or two guide plates for guiding.
The dynamic measuring method of the dynamic detector for the specific gravity of the liquid comprises the following steps:
s1, taking density as rho 1 Is provided with a measuring block;
s2, taking density as rho 2 And said connector having a cross-sectional area R;
s3, hanging the connecting piece and the measuring block on the weighing sensorSensor for reading weight M 1 ；
S4, continuously inputting the liquid to be measured into the container until the liquid submerges the measuring block, and slowly flowing out of the liquid guide port, and reading the dynamic weight M at the moment 2 ；
S5, setting the length L of the immersion liquid level of the connecting piece;
s6, according to the dynamic weight M 2 And the length L is used for measuring the dynamic specific gravity value W of the liquid to be measured in real time.
Preferably, the density in the step S1 is ρ 1 The measurement block is obtained as follows:
s1.1, taking a section bar with uniform density;
s1.2, a plurality of detection points are taken from the profile, and the detection points are uniformly distributed on the profile;
s1.3, sampling at a plurality of detection points, and respectively calculating the densities of the samples at the plurality of detection points;
s1.4, if the error of the density of the sample at the detection points is within a set value range, processing the profile into a plurality of measurement blocks, wherein the densities ρ of the measurement blocks are measured 1 Is the average of the densities of the samples at several of the detection points.
Preferably, the density in the step S2 is ρ 2 And the connection piece with the cross-sectional area R is obtained in the following way:
s2.1, taking a rod material with uniform density;
s2.2, processing the rod material into a cylindrical rod with uniform thickness
S2.3, a plurality of detection points are taken from the cylindrical rod, and the detection points are uniformly distributed on the cylindrical rod;
s2.4, sampling at a plurality of detection points, and respectively calculating the density rho of the sample at the plurality of detection points 2 And a cross-sectional area R;
s2.5, the density rho of the sample at a plurality of detection points 2 And the error of the cross-sectional area R is in the range of the set value, the cylindrical rod is processed into a plurality of connecting pieces,the density ρ of a plurality of the connectors 2 An average value of the densities of the samples at a plurality of the detection points; the cross-sectional area R of the plurality of connectors is the average value of the cross-sectional areas of the samples at the plurality of detection points.
Preferably, the calculating manner of the length L in the step S5 includes:
s5.1, adjusting the distance l from one end of the connecting piece, which is close to the measuring block, to the weighing sensor through the distance adjusting device 1 ；
S5.2, setting the distance from the weighing sensor to the bottom surface of the container to be l 2 ；
S5.3, setting the distance from the bottom edge of the liquid guide port to the bottom surface of the container as l 3 ；
S5.4, resulting in a length l=l 1 -(l 2 -l 3 )。
Preferably, the distance adjusting device is a laser distance measuring device;
the calculating manner of the length L in the step S5 includes:
s5.01, measuring the distance L from one end of the connecting piece connected with the measuring block to the distance adjusting device through the distance adjusting device 1 An included angle alpha with the horizontal plane;
s5.02, measuring the dynamic distance L from the liquid level to the distance adjusting device in real time by the distance adjusting device in the direction of an included angle alpha with the horizontal plane 2 ；
S5.02, calculating length L= (L) 1 -L 2 )*sinα。
Preferably, in the step S7, the calculation formula of the dynamic gravity value ρ is:
ρ＝(M 1 -M 2 )/((M 1 -R*l 1 *ρ 2 )/ρ 1 +R*L)＝(M 1 -M 2 )/(M 1 /ρ 1 +R*(L-l 1 *ρ 2 /ρ 1 ))；
when ρ is 2 ＝ρ 1 Then is ρ= (M) 1 -M 2 )/(M 1 /ρ 1 +R*(L-l 1 ))。
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
the invention relates to a dynamic detector for liquid specific gravity, which comprises a weighing sensor, a measuring block, a connecting piece and a container, wherein a distance adjusting device is arranged towards the container, a concave liquid guide opening is arranged at the edge of the container, a guide plate is arranged at the side edge of the liquid guide opening in an extending way towards the outside of the container, a drainage surface of the guide plate is connected with the inner wall of the container above the bottom edge of the liquid guide opening in a facing way, and liquid can flow into a flat and smooth drainage surface under the action of tension, so that the liquid is drained to the outside of the container, and the fluctuation of the liquid level caused by the tension is smaller and more stable; meanwhile, dynamic measurement is carried out in a mode based on the density of the measuring block, the density of the connecting piece and the accuracy of the cross section, so that the production difficulty of the measuring block and the connecting piece serving as reference pieces is effectively solved, and the error is greatly reduced.
Drawings
FIG. 1 is a schematic view of the weighing section of the present invention;
FIG. 2 is a schematic perspective view of the core of the container of the present invention;
fig. 3 is a top view of the structure of the core of the container of the present invention.
Reference numerals in the schematic drawings illustrate:
100. a weighing sensor; 200. a measuring block; 300. a connecting piece; 400. a container; 500. distance adjusting means; 410. a liquid guide port; 420. a deflector; 421. and a drainage surface.
Detailed Description
In order that the invention may be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, in which, however, the invention may be embodied in many different forms and are not limited to the embodiments described herein, but are instead provided for the purpose of providing a more thorough and complete disclosure of the invention.
It is noted that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present; the terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Example 1
Referring to fig. 1-3, the present embodiment provides a technical solution: the dynamic detector for the specific gravity of the liquid and the dynamic detection method thereof comprise a weighing sensor 100, a measuring block 200, a connecting piece 300 and a container 400, wherein one end of the connecting piece 300 is connected with the weighing sensor 100, and the other end is connected with the measuring block 200;
the measuring block 200 extends into the container 400 to be suspended; the container 400 is prevented from touching the measuring block 200, thereby affecting the weighing accuracy of the load cell 100.
The weighing sensor 100 is provided with a distance adjusting device 500 towards the container 400, and the distance adjusting device 500 adopts a laser range finder and has the advantage of high precision.
The edge of the container 400 is provided with a concave liquid guiding opening 410, the liquid guiding opening 410 is used for overflowing the liquid in the container 400, a guide plate 420 is arranged outside the container 400 from the side edge of the liquid guiding opening 410, and a drainage surface 421 of the guide plate 420 is connected with the inner wall of the container 400 above the bottom edge of the liquid guiding opening 410 in a direction and extends to the outer wall of the container 400 below the bottom edge of the liquid guiding opening 410. By utilizing the tension of the liquid and the wettability of the container 400, when the liquid level reaches the height of the liquid guide opening 410, the liquid lifted by the tension flows into the flat smooth drainage surface 421 under the action of the tension, so that the liquid can smoothly flow out of the drainage surface 421 of the guide plate 420 to the outside of the container 400, the lifting of the liquid level is obviously reduced, and the balance of the liquid in the accumulation process is broken as soon as possible through the drainage surface 421 of the guide plate 420, so that the liquid level fluctuation is smaller and more stable.
In a preferred embodiment, the container 400 is cylindrical, and the drainage surface 421 of the deflector 420 is tangential to the inner wall of the container 400. The liquid level in the container 400 is smoother to be connected with the drainage surface 421 of the deflector 420, so that the liquid can flow out of the container 400 as soon as possible, and the liquid level variation is smaller and more stable.
In a preferred embodiment, a plurality of liquid guiding ports 410 are provided, and one or two of the guiding plates 420 are provided for guiding the liquid from different liquid guiding ports 410. When the flow rate of the liquid is fast, the single liquid guiding port 410 may cause the drainage speed to be slow, so that the fluctuation of the liquid level is increased, therefore, a plurality of liquid guiding ports 410 are provided, and each liquid guiding port 410 is provided with one or two guide plates 420 for drainage, so that the drainage speed is improved, the stability of liquid drainage is ensured, and the liquid level fluctuation is smaller and more stable.
A dynamic measurement method of a dynamic detector for liquid specific gravity comprises the following steps:
s1, taking density as rho 1 Is provided with a measuring block 200;
s2, taking density as rho 2 And said connector 300 having a cross-sectional area R;
s3, hanging the connecting piece 300 and the measuring block 200 on the weighing sensor 100, and reading the weight M 1 ；
S4, continuously inputting the liquid to be measured into the container 400 until the liquid submerges the measuring block 200, and slowly flowing out of the liquid guide port 410, and reading the dynamic weight M at the moment 2 ；
S5, setting the length L of the immersion liquid level of the connecting piece 300;
s6, according to the dynamic weight M 2 And the length L is used for measuring the dynamic specific gravity value W of the liquid to be measured in real time.
By measuring the dynamic liquid specific gravity in the above manner, the defect that the conventional specific gravity meter needs to precisely control the volume of the measuring block 200 and the error caused by the fact that the connecting piece 300 in the conventional specific gravity meter stretches into the liquid level are overcome. As can be seen from the above method, the factors affecting the measurement accuracy of the present invention include the density ρ of the measurement block 200 1 Density ρ of the connector 300 2 And the accuracy of the cross-sectional area R, the length L, and the measurement accuracy of the load cell 100.
In a preferred embodiment, the density in step S1 is ρ 1 The measurement block 200 is obtained as follows:
s1.1, taking a section bar with uniform density;
s1.2, a plurality of detection points are taken from the profile, and the detection points are uniformly distributed on the profile;
s1.3, sampling at a plurality of detection points, and respectively calculating the densities of the samples at the plurality of detection points;
s1.4, if the error of the density of the sample at the detection points is within the set value range, processing the profile into a plurality of measurement blocks 200, wherein the density ρ of the measurement blocks 200 is that 1 Is the average of the densities of the samples at several of the detection points.
Compared with the control of the volume precision of a single measuring block 200, the measuring block 200 can be manufactured and processed in the mode, the density of a plurality of measuring blocks 200 in the same batch can be precisely controlled at the same time, the production difficulty of the measuring block 200 serving as consumable materials is greatly simplified, the production speed of the measuring block 200 is greatly accelerated while the density precision of the measuring block 200 is guaranteed, and the production cost of the measuring block 200 serving as a high-precision measuring reference is reduced.
In a preferred embodiment, the density in step S2 is ρ 2 And the connection 300 having the cross-sectional area R is obtained as follows:
s2.1, taking a rod material with uniform density;
s2.3, processing the rod material into a cylindrical rod with uniform thickness;
s2.3, a plurality of detection points are taken from the cylindrical rod, and the detection points are uniformly distributed on the cylindrical rod;
s2.4, sampling at a plurality of detection points, and respectively calculating the density rho of the sample at the plurality of detection points 2 And a cross-sectional area R; the calculation formula of the cross-sectional area R of the sample at the detection point is as follows:
R＝πd 2 4; the d is the diameter of the sample at the point of detection.
S2.5, the density rho of the sample at a plurality of detection points 2 And the error of the cross-sectional area R is within the set value range, the cylindrical rod is processed into a plurality of connecting pieces 300, and the density ρ of the plurality of connecting pieces 300 is obtained 2 An average value of the densities of the samples at a plurality of the detection points; the cross-sectional area R of the plurality of connectors 300 is an average of the cross-sectional areas of the samples at the plurality of inspection points.
By the above-mentioned method, the production cost of the connector 300 can be greatly reduced while the density accuracy of the connector 300 is ensured, in the same way as the production and processing of the measuring block 200; and meanwhile, the cylindrical rod-shaped arrangement is adopted, namely, the calculation of the cross-sectional area R is facilitated, and meanwhile, when the cross-sectional area R is smaller, the volume change caused by the change of the height of the liquid level immersed in the connecting piece 300 is smaller, so that the error caused by the fluctuation of the liquid level is smaller.
In a preferred embodiment, the setting of the length L in the step S5 includes:
s5.1, adjusting the distance l from one end of the connecting piece 300, which is close to the measuring block 200, to the weighing sensor 100 through the distance adjusting device 500 1 ；
S5.2, setting the distance from the weighing sensor 100 to the bottom surface of the container 400 to be l 2 ；
S5.3, setting the distance from the bottom edge of the liquid guiding opening 410 to the bottom surface of the container 400 to be l 3 ；
S5.4, calculated length l=l 1 -(l 2 -l 3 )。
When the dimensions of the container 400 and the connecting piece 300 are controlled through the production link, the installation positions of the weighing sensor 100 and the container 400 can be controlled within a certain error, so that after the length L is determined, the length L can be calculated as a constant value, and the influence on the detection efficiency due to the fact that the dimension is repeatedly measured in multiple measurements is avoided.
In a preferred embodiment, the distance adjusting device 500 is configured as a laser distance measuring device;
the setting manner of the length L in the step S5 includes:
s5.01, measuring the distance L from the end, connected with the measuring block 200, of the connecting piece 300 to the distance adjusting device 500 through the distance adjusting device 500 1 An included angle alpha with the horizontal plane;
s5.02, measuring the dynamic distance L from the liquid level to the distance adjusting device 500 in real time by the distance adjusting device 500 in the direction of an included angle alpha with the horizontal plane 2 ；
S5.02, calculated length l= (L) 1 -L 2 )*sinα。
The length L is calculated by means of a direct and precise measurement of the distance adjusting device 500, avoiding calculation deviations due to adjustment of the mounting errors of the connecting piece 300 or the length errors of the connecting piece 300 itself.
In a preferred embodiment, the dynamic specific gravity value ρ in step S6 is calculated by the formula:
ρ＝(M 1 -M 2 )/((M 1 -R*l 1 *ρ 2 )/ρ 1 +R*L)＝(M 1 -M 2 )/(M 1 /ρ 1 +R*(L-l 1 *ρ 2 /ρ 1 ))；
when ρ is 2 ＝ρ 1 Then is ρ= (M) 1 -M 2 )/(M 1 /ρ 1 +R*(L-l 1 ))；
The same batch of profiles is used for the connector 300 and the measuring block 200, so that ρ 2 ＝ρ 1 The method has the advantage of simplifying calculation, thereby improving the accuracy of measurement.
The M is 1 -M 2 The R x L is the volume of the connector 300 submerged below the liquid level, which is the weight of the liquid being drained.
The foregoing examples merely illustrate certain embodiments of the invention and are described in more detail and are not to be construed as limiting the scope of the invention; it should be noted that it is possible for a person skilled in the art to make several variants and modifications without departing from the concept of the invention, all of which fall within the scope of protection of the invention; accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (4)
1. The dynamic measuring method of the dynamic detector of the specific gravity of liquid is characterized in that the dynamic detector of the specific gravity of liquid comprises a weighing sensor (100), a measuring block (200), a connecting piece (300) and a container (400);
one end of the connecting piece (300) is connected with a weighing sensor (100), and the other end of the connecting piece is connected with the measuring block (200);
the measuring block (200) extends into the container (400) to be arranged in a suspending manner;
the load cell (100) is provided with a distance adjusting device (500) towards the container (400);
the edge of the container (400) is provided with a concave liquid guide port (410), and the liquid guide port (410) is used for overflowing liquid in the container (400);
the dynamic measurement method comprises the following steps:
s1, taking density as rho 1 Is provided with a measuring block (200);
s2, taking density as rho 2 And said connecting member (300) having a cross-sectional area R;
s3, hanging the connecting piece (300) and the measuring block (200) on the weighing sensor (100), and reading the weight M1;
s4, continuously inputting liquid to be measured into the container (400) until the liquid submerges the measuring block (200), and slowly flowing out of the liquid guide port (410), and reading the dynamic weight M2 at the moment;
s5, setting the length L of the immersion liquid level of the connecting piece (300);
the calculating manner of the length L in the step S5 includes:
s5.1, adjusting the distance l from one end of the connecting piece (300) close to the measuring block (200) to the weighing sensor (100) through the distance adjusting device (500) 1 ；
S5.2, setting the distance from the weighing sensor (100) to the bottom surface of the container (400) to be l 2 ；
S5.3, setting the distance from the bottom edge of the liquid guide port (410) to the bottom surface of the container (400) to be l 3 ；
S5.4, resulting in a length l=l 1 -(l 2 -l 3 )；
Alternatively, the calculating method of the length L in the step S5 includes:
s5.01, measuring the distance L from the end, connected with the measuring block (200), of the connecting piece (300) to the distance adjusting device (500) through the distance adjusting device (500) 1 An included angle alpha with the horizontal plane; wherein the distance adjusting device (500) is arranged as a laser ranging device;
s5.02 measuring the dynamic distance L from the liquid level to the distance adjusting device (500) in real time by the distance adjusting device (500) in the direction of an included angle alpha with the horizontal plane 2 ；
S5.03, calculating the length；
S6, measuring a dynamic specific gravity value W of the liquid to be measured in real time according to the dynamic weight M2 and the length L;
the calculation formula of the dynamic specific gravity value W in the step S6 is as follows:
；
when ρ is 2 ＝ρ 1 When then。
2. The dynamic measurement method of a dynamic detector for liquid specific gravity according to claim 1, wherein a baffle (420) is arranged outside a container (400) from the side edge of the liquid guiding port (410), and a drainage surface (421) of the baffle (420) is connected with the inner wall of the container (400) above the bottom edge of the liquid guiding port (410) in an opposite direction and extends to the outer wall of the container (400) below the bottom edge of the liquid guiding port (410);
the side wall of the container (400) is arranged in a curved surface, and a drainage surface (421) of the guide plate (420) is tangential to the inner wall of the container (400);
the liquid guide ports (410) are provided with a plurality of liquid guide ports, and different liquid guide ports (410) are provided with one or two guide plates (420) for guiding.
3. The dynamic measurement method of a dynamic detector for liquid specific gravity according to claim 1, wherein:
the density in the step S1 is ρ 1 The measurement block (200) is obtained in the following manner:
s1.1, taking a section bar with uniform density;
s1.2, a plurality of detection points are taken from the profile, and the detection points are uniformly distributed on the profile;
s1.3, sampling at a plurality of detection points, and respectively calculating the densities of the samples at the plurality of detection points;
s1.4, if the error of the density of the sample at the detection points is within a set value range, processing the profile into a plurality of measurement blocks (200), wherein the density ρ of the measurement blocks (200) is higher than that of the profile 1 Is the average of the densities of the samples at several of the detection points.
4. The dynamic measurement method of a dynamic detector for liquid specific gravity according to claim 1, wherein:
the density in the step S2 is ρ 2 And acquisition of said connection (300) with cross-sectional area RThe method is as follows:
s2.1, taking a rod material with uniform density;
s2.2, processing the rod material into a cylindrical rod with uniform thickness;
s2.3, a plurality of detection points are taken from the cylindrical rod, and the detection points are uniformly distributed on the cylindrical rod;
s2.4, sampling at a plurality of detection points, and respectively calculating the density rho of the sample at the plurality of detection points 2 And a cross-sectional area R;
s2.5, the density rho of the sample at a plurality of detection points 2 And the error of the cross-sectional area R is within the set value range, the cylindrical rod is processed into a plurality of connecting pieces (300), and the density ρ of the connecting pieces (300) is that 2 An average value of the densities of the samples at a plurality of the detection points; the cross-sectional area R of the plurality of connectors (300) is the average value of the cross-sectional areas of the samples at the plurality of detection points.
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| CN102213666A (en) * | 2010-04-13 | 2011-10-12 | 万丰奥特控股集团有限公司 | High-precision portable density measuring system and method |
| CN206431926U (en) * | 2017-01-21 | 2017-08-22 | 唐志远 | Physics floating force experimental provision |
| CN107560974A (en) * | 2017-08-15 | 2018-01-09 | 宜宾学院 | The detection method of intelligent densitometer |
| CN108627422A (en) * | 2018-06-05 | 2018-10-09 | 江苏海基新能源股份有限公司 | A kind of multi-functional density measurement device and application |
| CN112304805A (en) * | 2020-11-27 | 2021-02-02 | 大连海事大学 | Slurry density measuring device and density measuring method |
| CN113075085A (en) * | 2021-02-23 | 2021-07-06 | 湖南临风医疗器械有限公司 | Automatic monitor for urine specific gravity |
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