A high-precision buoyancy density meter and a method for measuring liquid density

Abstract

The present invention discloses a high-precision buoyancy densitometer and a method for measuring liquid density, which aims to solve the problem that in the prior art, when measuring liquid, the liquid must be still, so that the liquid is stratified and thus cannot reflect the true density of the liquid. The present invention solves the above technical problems through the following technical solutions: a weighing device; a weighing switching platform; a main container for holding samples is arranged on the weighing switching platform, and a stirring container and an output container connected to the main container are arranged on both sides of the main container; a magnetic stirrer corresponds to the position of the stirring container; a weighing base provided with a weighing sensor, which is arranged on the weighing device, and the weighing switching platform is suspended on the weighing base; the weighing base is connected to a support frame, and the top of the support frame is connected to a buoyancy measurement block through a pull rope.

Description

Technical Field

[0001] The present invention relates to the technical field of density meters, and more specifically, to a high-precision buoyancy density meter and a method for measuring liquid density. Background Art

[0002] Density detection is an essential test parameter for the research and development of mixed fluids and new materials, and plays a very important role in the experimental process and results. The current front-end density detection device mainly uses a small measuring cylinder to take samples, introduces the sample into a glass tube density meter, and manually reads the value on the liquid plane line.

[0003] When workers take samples, they must first let the liquid stand before reading the density value. However, the liquid is often stratified and cannot truly reflect the actual density of the fluid, so it cannot meet the needs of industrial online testing. In addition, due to the low accuracy of the glass tube scale itself (the highest control is within one thousandth), manual operation and reading numerical errors further reduce the accuracy, making it impossible to achieve automatic measurement and control, and it is difficult to meet the needs of scientific research and technological development. Summary of the invention

[0004] The present invention overcomes the shortcomings of the prior art that when measuring liquid, the liquid must be still, causing the liquid to be stratified and thus unable to reflect the true density of the liquid. A high-precision buoyancy densitometer is provided, which can simulate the normal flow state of the liquid and measure the true density of the liquid; at the same time, it can reduce the error of liquid density measurement and improve the accuracy of liquid density.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: a high-precision buoyancy density meter, comprising:

[0006] Weighing switching platform; a main container for holding samples is arranged on the weighing switching platform, and a stirring container and an output container connected to the main container are arranged on both sides of the main container;

[0007] A magnetic stirrer, corresponding to the position of the stirring vessel;

[0008] A weighing base is provided with a weighing sensor, and a weighing switching platform is suspended on the weighing base; the weighing base is connected to a supporting frame, and a detachably connected buoyancy measuring block is provided on the top of the supporting frame.

[0009] In the present invention, when in use, the liquid to be tested can be injected into the stirring container through the conveying device, and pumped out from the liquid output container at the same time, so that the liquid reaches the output container after passing through the main container from the stirring container, and the appropriate flow rate through the main container is controlled, so that the buoyancy measuring block is in a static measurement environment; the magnetic stirrer drives the rotor pre-placed in the main container or the stirring container to rotate to ensure uniform stirring. The difference between the mass of the buoyancy measuring block in the air and the mass of the buoyancy measuring block after being submerged in the liquid to be tested can be used to preliminarily obtain the density of the liquid to be tested. Not only is the measurement process fully automated and does not require human operation, but it can also simulate the normal flow state of the liquid and measure the true density of the liquid; in addition, according to the real-time temperature of the liquid and the weight of the buoyancy measuring block set in the program, compensation calculations can be performed to calculate the precise density value of the liquid at the expected temperature, which can reduce the error in liquid density measurement and improve the accuracy of liquid density.

[0010] Preferably, the support frame includes a plurality of support rods arranged in the circumferential direction of the weighing base, the support rods include a horizontal rod, a vertical rod and an inclined rod connected to the weighing base; the vertical rod is vertically arranged and the lower end is fixedly connected to the horizontal rod, the inclined rod is connected to the top of the vertical rod, the tops of the plurality of inclined rods are interconnected to form a top fulcrum, the top fulcrum is connected with a pull rope, and the bottom end of the pull rope is connected to the buoyancy measuring block.

[0011] The gravity of the buoyancy measuring block is evenly transmitted to the periphery of the weighing base through a plurality of support frames, so that the force on the periphery of the weighing base is more evenly applied, thereby improving the measurement accuracy of the weighing sensor on the weighing base.

[0012] Preferably, a bottom groove cooperating with the weighing base is provided at the center of the bottom of the weighing switching platform, and a plurality of deep grooves and shallow grooves matching with the horizontal rod are provided in the circumferential direction of the bottom groove; when the horizontal rod is located in the deep groove, the weighing switching platform is suspended on the weighing base; when the horizontal rod is located in the shallow groove, the weighing switching platform is directly supported on the horizontal rod through the shallow groove.

[0013] When in use, the horizontal rod can be switched to be located in the deep groove or the shallow groove as needed, realizing the function of switching between the normal weighing mode (the horizontal rod is located in the shallow groove) and the density measurement mode (the horizontal rod is located in the deep groove). In the normal weighing mode, the sample placed in the main container can be weighed.

[0014] Preferably, a temperature sensor for measuring the temperature of the liquid is provided on the weighing switching platform.

[0015] According to the real-time temperature of the liquid and the weight of the buoyancy measuring block set in the program, compensation operation is performed to calculate the precise density value of the liquid at the expected temperature, which can reduce the error of liquid density measurement.

[0016] Preferably, it further comprises a weighing device, on which a load-bearing platform is arranged, and a weighing switching platform and a weighing base are both arranged on the weighing platform.

[0017] The weighing device can be used as an operating platform, and the weighing switching platform and the weighing base are both arranged on the weighing platform; the weighing device can also be a weighing balance, so that when the horizontal rod is located in the shallow groove, the sample can also be weighed, and heavier samples can be weighed, which plays a protective role on the weighing sensor.

[0018] Preferably, a stirring through hole is provided through the side wall of the main container close to the stirring container; an output through hole is provided through the side wall of the main container close to the output container.

[0019] The stirring perforations are evenly distributed in the area where the stirring container overlaps with the main container; and the output perforations are evenly distributed in the area where the output container overlaps with the main container.

[0020] Preferably, the magnetic stirrer is connected to a slider, and the slider moves along an elliptical trajectory.

[0021] The slider can move along an elliptical trajectory, so that the rotor can fully stir the liquid to be measured, so that the density of the liquid to be measured remains uniform, thereby improving the measurement accuracy.

[0022] The present application also provides a method for measuring liquid density, comprising the above-mentioned high-precision buoyancy density meter, and further comprising the following steps:

[0023] S01, pouring liquid into a stirring container, and starting a magnetic stirrer to stir the liquid in the stirring container;

[0024] S02, pumping the liquid out of the output container and pumping it into the stirring container;

[0025] S03, when the liquid flows stably in the main container, immerse the buoyancy measuring block in the liquid container, and the weight sensor records the weight change of the buoyancy measuring block before and after immersion in the liquid;

[0026] S04. Calculate the density of the liquid according to the density measurement formula.

[0027] The above measurement process can realize dynamic measurement of liquid density, so as to more truly reflect the density of the liquid to be measured. At the same time, it can reduce the error of liquid density measurement and improve the accuracy of liquid density.

[0028] Preferably, the force exerted by the liquid to be measured on the standard buoyancy ball is related to the flow rate of the liquid to be measured and is taken into account in the density measurement formula.

[0029] By taking the influence of the flow rate of the liquid on the buoyancy measuring block into consideration in the calculation formula, the density of the liquid can be measured more accurately.

[0030] Preferably, the density measurement formula is combined with the temperature change of the liquid volume to draw a curve of the relationship between density and temperature.

[0031] In this embodiment, the effect of temperature on liquid volume is taken into account in the calculation formula for measuring liquid density, so that more accurate measurement can be achieved.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) The liquid to be tested can be injected into the stirring container through the conveying device and pumped out from the liquid output container at the same time, so that the liquid passes through the main container from the stirring container to the output container, and the appropriate flow rate through the main container is controlled to place the buoyancy measuring block in a static measurement environment; the magnetic stirrer drives the rotor pre-placed in the main container or the stirring container to rotate to ensure uniform stirring. The difference in mass between the buoyancy measuring block in the air and after being submerged in the liquid to be tested can be used to preliminarily obtain the density of the liquid to be tested. Not only is the measurement process fully automated and does not require human operation, but it can also simulate the normal flow state of the liquid to measure the true density of the liquid;

[0034] (2) Based on the real-time temperature of the liquid and the weight of the buoyancy measuring block set in the program, a compensation operation is performed to calculate the precise density value of the liquid at the expected temperature, which can reduce the error of liquid density measurement and improve the accuracy of liquid density;

[0035] (3) The device has an integrated design and multiple measurement modes. It can switch between the normal weighing mode (the horizontal rod is located in a shallow groove) and the density measurement mode (the horizontal rod is located in a deep groove) by adjusting the angle of the weighing switching platform. It can also perform online dynamic measurement or offline static measurement of the liquid to be tested by using a stirring container, thus meeting the density measurement needs under various conditions. It takes up little space and reduces the overall cost of scientific research. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a three-dimensional structural diagram of the present invention.

[0037] Figure 2 It is a three-dimensional structural diagram from another angle of the present invention.

[0038] Figure 3 It is a three-dimensional structural diagram of the main container of the present invention.

[0039] Figure 4 It is a schematic diagram of the weighing base and its related structures of the present invention.

[0040] Figure 5 It is a structural schematic diagram of the bottom of the weighing switching platform of the present invention.

[0041] In the figure: 1, weighing device, 11, weighing platform;

[0042] 2. main container, 21. stirring container, 211. stirring perforation, 22. output container, 221. output perforation;

[0043] 3. Magnetic stirrer, 31. Slider, 32. Track;

[0044] 4. weighing base, 41. pull rope, 42. buoyancy measuring block, 43. horizontal rod, 44. vertical rod, 45. tilt rod, 46. top fulcrum;

[0045] 5. Weighing switching platform, 51. bottom trough, 52. deep trough, 53. shallow trough. DETAILED DESCRIPTION

[0046] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0047] Example 1: Reference Figures 1 to 4 As shown, a high-precision buoyancy density meter comprises:

[0048] A weighing switching platform 5; a main container 2 for containing a sample is disposed on the weighing switching platform 5, and a stirring container 21 and an output container 22 are disposed on both sides of the main container 2 and are both connected thereto;

[0049] A magnetic stirrer 3, corresponding to the position of the stirring container 21;

[0050] A weighing base 4 provided with a weighing sensor is arranged on the weighing device 1, and a weighing switching platform 5 is suspended on the weighing base 4; the weighing base 4 is connected to a support frame, and the top of the support frame is connected to a buoyancy measuring block 42 through a pull rope 41.

[0051] The device also includes a weighing device 1. The weighing device 1 in this embodiment is a weighing balance. A weighing platform 11 is provided on the weighing balance. An object is placed on the weighing platform 11 to weigh the object. The weighing balance has the characteristics of high precision and convenient use.

[0052] The weighing base 4 is arranged on the weighing platform 11. The load-bearing base in this embodiment is a cylindrical base arranged on the weighing platform 11, and a weighing sensor is arranged on the cylindrical base, and the weighing sensor is used to measure the weight of the heavy object carried on the weighing base 4. The weighing switching platform 5 is suspended above the weighing base 4, that is, when a heavy object is placed on the weighing switching platform 5, the weighing base 4 will not be affected by the heavy object on the weighing switching platform 5.

[0053] A main container 2 for holding samples is arranged on the weighing switching platform 5, and a stirring container 21 and an output container 22 are arranged on both sides of the main container 2, both of which are connected thereto. The main container 2, the stirring container 21 and the output container 22 are all made of quartz material. The stirring container 21 and the output container 22 are arranged on both sides of the main container 2, and a stirring through hole 211 is penetrated through the side wall of the main container 2 close to the stirring container 21, and the stirring through hole 211 is evenly distributed in the area where the stirring container 21 and the main container 2 overlap; and an output through hole 221 is penetrated through the side wall of the main container 2 close to the output container 22, and the output through hole 221 is evenly distributed in the area where the output container 22 and the main container 2 overlap.

[0054] In one embodiment, the support frame includes a plurality of support rods arranged in the circumferential direction of the weighing base 4, and the plurality of support rods are arranged in the circumferential direction of the weighing base 4, so that the support frame forms a structure similar to a birdcage. The support rods in this embodiment include a horizontal rod 43, a vertical rod 44 and an inclined rod 45 connected to the weighing base 4; the vertical rod 44 is arranged vertically and the lower end is fixedly connected to the horizontal rod 43, the inclined rod 45 is connected to the top of the vertical rod 44, and the tops of the plurality of inclined rods 45 are connected to each other to form a top fulcrum 46, and the upper end of the pull rope 41 is connected to the top fulcrum 46.

[0055] The pull rope 41 is connected with a buoyancy measuring block 42, and the buoyancy measuring block 42 in this embodiment is a spherical structure. The buoyancy measuring block 42 in this embodiment is connected to the top fulcrum 46 through the pull rope 41, and the gravity of the buoyancy measuring block 42 is evenly transmitted to the surroundings of the weighing base 4 through a plurality of support frames, so that the force around the weighing base 4 is more evenly applied, thereby improving the measurement accuracy of the weighing sensor on the weighing base 4. In this embodiment, there are 4 support rods, and the 4 support rods are evenly distributed in the circumferential direction of the weighing base 4.

[0056] In this embodiment, a temperature sensor for measuring the temperature of the liquid is also provided on the weighing switching platform 5 for measuring the temperature of the liquid in real time.

[0057] It should be noted that the data measured by the load-bearing device, the weighing sensor, and the temperature sensor in this embodiment are all transmitted to the computer, and the density of the liquid can be automatically calculated by the computer, thereby realizing online measurement of the density of the liquid.

[0058] The force measuring stirrer cooperates with a rotor placed in the liquid to be measured, so that the rotor rotates in the liquid to be measured, so that the liquid to be measured is stirred more evenly and the density of the liquid to be measured is uniform.

[0059] In one of the embodiments, in order to stir the liquid to be tested more evenly, the force measuring stirrer is connected to the slider 31, and the slider 31 slides along the track 32, so that the slider 31 can move along an elliptical trajectory (the track 32 can be set to an elliptical shape, and the slider 31 slides in the elliptical track), so that the rotor can fully stir the liquid to be tested, so that the density of the liquid to be tested remains uniform, thereby improving the measurement accuracy.

[0060] The working principle of this embodiment is as follows. This embodiment is divided into static measurement and dynamic measurement.

[0061] During static measurement: the liquid to be tested can be directly poured into the main container 2; the measurement function is started, the magnetic stirrer 3 is driven to swing, and the rotor in the main container 2 is driven to stir the liquid to be tested; after 60 seconds of uniform operation, the liquid is in a uniform state, and the stirring is stopped at this time, and the temperature of the liquid in the main container 2 is detected in real time; then the weighing base 4 measures the weight of the buoyancy measuring block 42 after being submerged by the liquid to be tested, and after 5 seconds of stable data input, the weight value with an accuracy of no more than one ten-thousandth is obtained according to the calculation program; the device control program gives the density value of the measured liquid sample through logical operations.

[0062] During dynamic measurement: the liquid to be measured can be injected into the stirring container 21 through the conveying device, and pumped out from the liquid output container 22 at the same time, so that the liquid reaches the output container 22 after passing through the main container 2 from the stirring container 21, and the appropriate flow rate through the main container 2 is controlled, so that the buoyancy measurement block 42 is in a static measurement environment; the slider 31 drives the magnetic stirrer 3 to swing along the elliptical track, so that the magnetic stirrer 3 drives the rotor pre-placed in the main container 2 or the stirring container 21 to rotate while elliptical motion to ensure uniform stirring. The buoyancy measurement block 42 is suspended on the top of the support frame. The difference in mass between the buoyancy measurement block 42 in the air and the mass after being submerged in the liquid to be measured can be used to preliminarily obtain the density of the liquid to be measured; the temperature of the liquid in the main container 2 is measured in real time by the built-in temperature sensor of the weighing switching platform 5, and then the compensation operation is performed according to the real-time temperature of the liquid and the weight of the buoyancy measurement block set in the program to calculate the precise density value of the liquid at the expected temperature. The measurement process is fully automated and no human operation is required.

[0063] The principle of measuring the liquid density by the buoyancy measuring block 42 in this embodiment is as follows: assuming that the weight of the buoyancy measuring block 42 in the air is m 0 , the weight in the liquid to be tested is m 1 , the volume of the buoyancy measuring block 42 is V 球 , the mass of the liquid to be measured is m 液 , the temperature of the liquid to be measured is T, the volume of the liquid to be measured is a function V(T) related to the temperature, the flow rate of the liquid to be measured is u, and the force exerted by the liquid to be measured on the buoyancy measurement block 42 is a function F(u) related to the flow rate; let the density of the liquid to be measured be ρ液 ,have , where g is the acceleration due to gravity. The density of the liquid to be tested at the current temperature can be obtained by solving , and draw a curve of density versus temperature.

[0064] In this embodiment, according to the calculation formula, the density range used is ρ>1.0g / cm 3 And the volume range is V>10cm 3 An isotropic buoyancy measuring block 42, a suspension rope 41 with a diameter range of Ф<5mm, a specially designed sample pool and a high-precision four-digit weighing device 1 are used to control the flow rate and direction of the liquid to be measured, improve the measurement accuracy and stability, meet the needs of online dynamic measurement and static measurement, and actually improve the accuracy of the existing buoyancy density meter from one ten-thousandth to one ten-thousandth. By adding a stirring module and a temperature measurement module, the interference of the unevenness of the liquid to be measured and the temperature on the liquid density measurement is avoided, and a density-temperature relationship curve is drawn to obtain a more stable and reliable density measurement result.

[0065] The device has an integrated design and multiple measurement modes. It can switch between the normal weighing mode (the horizontal rod 43 is located in the shallow groove 53) and the density measurement mode (the horizontal rod 43 is located in the deep groove 52) by adjusting the angle of the weighing switching platform 5. It can perform online dynamic measurement or offline static measurement of the liquid to be measured by whether to use the stirring container 21, thereby meeting the density measurement needs under various conditions. It takes little space and reduces the comprehensive cost of scientific research.

[0066] Example 2: Reference Figures 1 to 4 As shown, a high-precision buoyancy density meter comprises:

[0067] A weighing switching platform 5; a main container 2 for containing a sample is disposed on the weighing switching platform 5, and a stirring container 21 and an output container 22 are disposed on both sides of the main container 2 and are both connected thereto;

[0068] A magnetic stirrer 3, corresponding to the position of the stirring container 21;

[0069] A weighing base 4 provided with a weighing sensor is arranged on the weighing device 1, and a weighing switching platform 5 is suspended on the weighing base 4; the weighing base 4 is connected to a support frame, and the top of the support frame is connected to a buoyancy measuring block 42 through a pull rope 41.

[0070] The device also includes a weighing device 1. The weighing device 1 in this embodiment is a weighing balance. A weighing platform 11 is provided on the weighing balance. An object is placed on the weighing platform 11 to weigh the object. The weighing balance has the characteristics of high precision and convenient use.

[0071] The weighing base 4 is arranged on the weighing platform 11. The load-bearing base in this embodiment is a cylindrical base arranged on the weighing platform 11, and a weighing sensor is arranged on the cylindrical base, and the weighing sensor is used to measure the weight of the heavy object carried on the weighing base 4. The weighing switching platform 5 is suspended above the weighing base 4, that is, when a heavy object is placed on the weighing switching platform 5, the weighing base 4 will not be affected by the heavy object on the weighing switching platform 5.

[0072] A main container 2 for holding samples is arranged on the weighing switching platform 5, and a stirring container 21 and an output container 22 are arranged on both sides of the main container 2, both of which are connected thereto. The main container 2, the stirring container 21 and the output container 22 are all made of quartz material. The stirring container 21 and the output container 22 are arranged on both sides of the main container 2, and a stirring through hole 211 is penetrated through the side wall of the main container 2 close to the stirring container 21, and the stirring through hole 211 is evenly distributed in the area where the stirring container 21 and the main container 2 overlap; and an output through hole 221 is penetrated through the side wall of the main container 2 close to the output container 22, and the output through hole 221 is evenly distributed in the area where the output container 22 and the main container 2 overlap.

[0073] In one embodiment, the support frame includes a plurality of support rods arranged in the circumferential direction of the weighing base 4, and the plurality of support rods are arranged in the circumferential direction of the weighing base 4, so that the support frame forms a structure similar to a birdcage. The support rods in this embodiment include a horizontal rod 43, a vertical rod 44 and an inclined rod 45 connected to the weighing base 4; the vertical rod 44 is arranged vertically and the lower end is fixedly connected to the horizontal rod 43, the inclined rod 45 is connected to the top of the vertical rod 44, and the tops of the plurality of inclined rods 45 are connected to each other to form a top fulcrum 46, and the upper end of the pull rope 41 is connected to the top fulcrum 46.

[0074] The pull rope 41 is connected with a buoyancy measuring block 42, and the buoyancy measuring block 42 in this embodiment is a spherical structure. The buoyancy measuring block 42 in this embodiment is connected to the top fulcrum 46 through the pull rope 41, and the gravity of the buoyancy measuring block 42 is evenly transmitted to the surroundings of the weighing base 4 through a plurality of support frames, so that the force around the weighing base 4 is more evenly applied, thereby improving the measurement accuracy of the weighing sensor on the weighing base 4. In this embodiment, there are 4 support rods, and the 4 support rods are evenly distributed in the circumferential direction of the weighing base 4.

[0075] In this embodiment, a temperature sensor for measuring the temperature of the liquid is also provided on the weighing switching platform 5 for measuring the temperature of the liquid in real time.

[0076] It should be noted that the data measured by the load-bearing device, the weighing sensor, and the temperature sensor in this embodiment are all transmitted to the computer, and the density of the liquid can be automatically calculated by the computer, thereby realizing online measurement of the density of the liquid.

[0077] The force measuring stirrer cooperates with a rotor placed in the liquid to be measured, so that the rotor rotates in the liquid to be measured, so that the liquid to be measured is stirred more evenly and the density of the liquid to be measured is uniform.

[0078] In one of the embodiments, in order to stir the liquid to be tested more evenly, the force measuring stirrer is connected to the slider 31, and the slider 31 slides along the track 32, so that the slider 31 can move along an elliptical trajectory (the track 32 can be set to an elliptical shape, and the slider 31 slides in the elliptical track), so that the rotor can fully stir the liquid to be tested, so that the density of the liquid to be tested remains uniform, thereby improving the measurement accuracy.

[0079] The structure of this embodiment is similar to that of Embodiment 1, except that a bottom groove 51 cooperating with the weighing base 4 is provided at the center of the bottom of the weighing switching platform 5, and a plurality of deep grooves 52 and shallow grooves 53 matching the horizontal rod 43 are provided in the circumferential direction of the bottom groove 51; when the horizontal rod 43 is located in the deep groove 52, the weighing switching platform 5 is directly made on the weighing device 1; when the horizontal rod 43 is located in the shallow groove 53, the weighing switching platform 5 is directly supported on the horizontal rod 43 through the shallow groove 53.

[0080] The number of shallow grooves 53 and deep grooves 52 in this embodiment corresponds to the number of support rods. In this embodiment, there are 4 support rods, and correspondingly, there are 4 deep grooves 52 and 4 shallow grooves 53. Since the side weight sensor on the weighing base 4 has high precision, when in use, the horizontal rod 43 can be switched to be located in the deep groove 52 or the shallow groove 53 as needed, so as to protect the weighing sensor on the weighing base 4. Specifically, when it is necessary to measure the density or the general liquid weight, the weighing switching platform 5 can be rotated so that the position of the horizontal rod 43 corresponds to the position of the deep groove 52, so that the weighing switching platform 5 is directly supported on the weighing platform 11, and will not affect the weighing sensor on the weighing base 4. When it is necessary to measure the weight of the liquid with high precision, the weighing base 4 can be rotated so that the position of the horizontal rod 43 corresponds to the position of the shallow groove 53, so that the weighing switching platform 5 is directly supported on the horizontal rod 43 through the shallow groove 53, and then the weight of the liquid is measured with high precision through the weighing sensor.

[0081] The working principle of this embodiment is as follows. This embodiment is divided into static measurement and dynamic measurement.

[0082] During static measurement: the liquid to be tested can be directly poured into the main container 2; the measurement function is started, the magnetic stirrer 3 is driven to swing, and the rotor in the main container 2 is driven to stir the liquid to be tested; after 60 seconds of uniform operation, the liquid is in a uniform state, and the stirring is stopped at this time, and the temperature of the liquid in the main container 2 is detected in real time; then the weighing base 4 measures the weight of the buoyancy measuring block 42 after being submerged by the liquid to be tested, and after 5 seconds of stable data input, the weight value with an accuracy of no more than one ten-thousandth is obtained according to the calculation program; the device control program gives the density value of the measured liquid sample through logical operations.

[0083] During dynamic measurement: the liquid to be measured can be injected into the stirring container 21 through the conveying device, and pumped out from the liquid output container 22 at the same time, so that the liquid reaches the output container 22 after passing through the main container 2 from the stirring container 21, and the appropriate flow rate through the main container 2 is controlled, so that the buoyancy measurement block 42 is in a static measurement environment; the slider 31 drives the magnetic stirrer 3 to swing along the elliptical track, so that the magnetic stirrer 3 drives the rotor pre-placed in the main container 2 or the stirring container 21 to rotate while elliptical motion to ensure uniform stirring. The buoyancy measurement block 42 is suspended on the top of the support frame. The difference in mass between the buoyancy measurement block 42 in the air and the mass after being submerged in the liquid to be measured can be used to preliminarily obtain the density of the liquid to be measured; the temperature of the liquid in the main container 2 is measured in real time by the built-in temperature sensor of the weighing switching platform 5, and then the compensation operation is performed according to the real-time temperature of the liquid and the weight of the buoyancy measurement block set in the program to calculate the precise density value of the liquid at the expected temperature. The measurement process is fully automated and no human operation is required.

[0084] The principle of measuring the liquid density by the buoyancy measuring block 42 in this embodiment is as follows: assuming that the weight of the buoyancy measuring block 42 in the air is m 0 , the weight in the liquid to be tested is m 1 , the volume of the buoyancy measuring block 42 is V 球 , the mass of the liquid to be measured is m 液 , the temperature of the liquid to be measured is T, the volume of the liquid to be measured is a function V(T) related to the temperature, the flow rate of the liquid to be measured is u, and the force exerted by the liquid to be measured on the buoyancy measurement block 42 is a function F(u) related to the flow rate; let the density of the liquid to be measured be ρ 液 ,have , where g is the acceleration due to gravity. The density of the liquid to be tested at the current temperature can be obtained by solving , and draw a curve of density versus temperature.

[0085] In this embodiment, according to the calculation formula, the density range used is ρ>1.0g / cm 3 And the volume range is V>10cm 3An isotropic buoyancy measuring block 42, a suspension rope 41 with a diameter range of Ф<5mm, a specially designed sample pool and a high-precision four-digit weighing device 1 are used to control the flow rate and direction of the liquid to be measured, improve the measurement accuracy and stability, meet the needs of online dynamic measurement and static measurement, and actually improve the accuracy of the existing buoyancy density meter from one ten-thousandth to one ten-thousandth. By adding a stirring module and a temperature measurement module, the interference of the unevenness of the liquid to be measured and the temperature on the liquid density measurement is avoided, and a density-temperature relationship curve is drawn to obtain a more stable and reliable density measurement result.

[0086] The device has an integrated design and multiple measurement modes. It can switch between the normal weighing mode (the horizontal rod 43 is located in the shallow groove 53) and the density measurement mode (the horizontal rod 43 is located in the deep groove 52) by adjusting the angle of the weighing switching platform 5. It can perform online dynamic measurement or offline static measurement of the liquid to be measured by whether to use the stirring container 21, thereby meeting the density measurement needs under various conditions. It takes little space and reduces the comprehensive cost of scientific research.

[0087] Embodiment 3: This embodiment is similar in structure to Embodiment 2 or Embodiment 3, except that the stirring container 21 is located below the output container 22, so that when performing dynamic measurement, the water flows from bottom to top.

[0088] Embodiment 4: A method for measuring liquid density, comprising the high-precision buoyancy density meter in Embodiment 2 and Embodiment 3, further comprising the following steps:

[0089] S01, pouring liquid into the stirring container 21, and starting the magnetic stirrer 3 to stir the liquid in the stirring container 21;

[0090] S02, pumping the liquid out of the output container 22 and pumping it into the stirring container 21;

[0091] S03, when the liquid flows stably in the main container 2, the buoyancy measuring block 42 is immersed in the liquid container, and the weight sensor records the weight change of the buoyancy measuring block 42 before and after being immersed in the liquid;

[0092] S04. Calculate the density of the liquid according to the density measurement formula.

[0093] Through the above measurement process, the density of the liquid can be dynamically measured, so that the density of the liquid to be measured can be more realistically reflected, and the error of the liquid density measurement can be reduced, thereby improving the accuracy of the liquid density.

[0094] In one embodiment, the force applied by the liquid to be tested on the standard buoyancy ball is related to the flow rate of the liquid to be tested, and is considered to be combined with the density measurement formula. Specifically, the density measurement formula is: ; The weight of the buoyancy measuring block 42 in the air is m 0 , the weight in the liquid to be tested is m 1 , the volume of the standard buoyancy ball is V 球 , the mass of the liquid to be measured is m 液 ; The flow rate of the liquid to be tested is u, and the force exerted by the liquid to be tested on the standard buoyancy ball is a function F (u) related to the flow rate.

[0095] By taking the influence of the flow rate of the liquid on the buoyancy measuring block 42 into consideration in the calculation formula, the density of the liquid can be measured more accurately.

[0096] In one embodiment, the density measurement formula and the temperature change of the liquid volume are combined to draw a density-temperature relationship curve. Specifically, the density measurement formula and Draw a curve showing the relationship between density and temperature.

[0097] In this embodiment, the effect of temperature on liquid volume is taken into account in the calculation formula for measuring liquid density, so that more accurate measurement can be achieved.

[0098] In this embodiment, according to the calculation formula, the density range used is ρ>1.0g / cm 3 And the volume range is V>10cm 3 An isotropic buoyancy measuring block 42, a suspension rope 41 with a diameter range of Ф<5mm, a specially designed sample pool and a high-precision four-digit weighing device 1 are used to control the flow rate and direction of the liquid to be measured, improve the measurement accuracy and stability, meet the needs of online dynamic measurement and static measurement, and actually improve the accuracy of the existing buoyancy density meter from one ten-thousandth to one ten-thousandth. By adding a stirring module and a temperature measurement module, the interference of unevenness of the liquid to be measured and temperature on the liquid density measurement is avoided, and a density-temperature relationship curve is drawn to obtain a more stable and reliable density measurement result.

[0099] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A high-precision buoyancy density meter, characterized in that: include: A weighing switching platform; a main container for holding samples is arranged on the weighing switching platform, and a stirring container and an output container connected to the main container are arranged on both sides of the main container; A magnetic stirrer, corresponding to the position of the stirring vessel; A weighing base is provided with a weighing sensor, and a weighing switching platform is suspended on the weighing base; the weighing base is connected to a support frame, and a detachably connected buoyancy measuring block is provided on the top of the support frame; The support frame includes a plurality of support rods arranged in the circumferential direction of the weighing base, and the support rods include horizontal rods connected to the weighing base; A bottom groove matching the weighing base is arranged at the center of the bottom of the weighing switching platform, and a plurality of deep grooves and shallow grooves matching the horizontal rod are arranged in the circumferential direction of the bottom groove; when the horizontal rod is located in the deep groove, the weighing switching platform is suspended on the weighing base; when the horizontal rod is located in the shallow groove, the weighing switching platform is directly supported on the horizontal rod through the shallow groove.

2. The high-precision buoyancy density meter according to claim 1 is characterized in that: The support frame also includes a vertical rod and an inclined rod; the vertical rod is vertically arranged and the lower end is fixedly connected to the horizontal rod, the inclined rod is connected to the top of the vertical rod, the tops of several inclined rods are interconnected to form a top fulcrum, the top fulcrum is connected to a pull rope, and the bottom end of the pull rope is connected to the buoyancy measuring block.

3. The high-precision buoyancy density meter according to claim 1 or 2, characterized in that: A temperature sensor for measuring the temperature of the liquid is arranged on the weighing switching platform.

4. The high-precision buoyancy density meter according to claim 1 or 2, characterized in that: The weighing device is also included. A weighing platform is arranged on the weighing device. A weighing switching platform and a weighing base are both arranged on the weighing platform.

5. The high-precision buoyancy density meter according to claim 1 or 2, characterized in that: A stirring through hole is provided through the side wall of the container close to the stirring container; an output through hole is provided through the side wall of the main container close to the output container.

6. The high-precision buoyancy density meter according to claim 1 or 2, characterized in that: The magnetic stirrer is connected with a slider, and the slider moves along an elliptical trajectory.

7. A method for measuring liquid density, characterized in that: The high-precision buoyancy density meter according to any one of claims 1 to 6 further comprises the following steps: S01, pouring liquid into a stirring container, and starting a magnetic stirrer to stir the liquid in the stirring container; S02, pumping the liquid out of the output container and pumping it into the stirring container; S03, when the liquid flows stably in the main container, immerse the buoyancy measuring block in the liquid container, and the weight sensor records the weight change of the buoyancy measuring block before and after immersion in the liquid; S04. Calculate the density of the liquid according to the density measurement formula.

8. The method for measuring liquid density according to claim 7, characterized in that: The force applied by the liquid to be tested to the standard buoyancy ball is related to the flow rate of the liquid to be tested. This force is taken into account in the density measurement formula to calculate the density of the liquid.

9. The method for measuring liquid density according to claim 7, wherein the density The measurement formula is combined with the change in the volume of the liquid due to temperature to draw a curve showing the relationship between density and temperature.

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