A liquid density measuring device

Abstract

The utility model discloses a liquid density measuring device, including the drive device for providing controllable drive output and setting in the density detection body of measured liquid, still include tension detection device, it is connected between drive device and density detection body, for real -time detection density detection body in liquid the tension that suffers, still include processing module. Through drive device, density detection body, tension detection device and processing module's cooperation and cooperation, realized the high accuracy automation measurement of liquid density. The device utilizes drive device to drive density detection body to move in liquid with preset step -by -step mode, combines tension detection device real -time acquisition its tension data in liquid, and through processing module is based on dynamics principle automatic calculation liquid density, effectively overcomeed the shortcoming that traditional manual sampling operation was complicated, low efficiency, was vulnerable to environmental interference, and the accuracy and reliability of measurement were improved significantly.

Description

Technical Field

[0001] This utility model relates to the field of liquid density measurement technology, specifically a liquid density measuring device. Background Technology

[0002] In industries such as coal coking and chemicals, measuring the liquid density of large oil storage tanks is a critical technical requirement. However, due to the complex and opaque internal environment of these tanks, traditional density measurement methods face numerous challenges. For example, the specific gravity method requires manual sampling, which is not only cumbersome and inefficient but also difficult to maintain constant temperature during sampling, leading to significant errors in the measurement results. Furthermore, the float method, based on Archimedes' principle, calculates density by measuring the buoyancy of a float in the liquid, but this method also has significant shortcomings in practical applications. Especially in coking plant tanks, where the liquid contains components such as ammonia, stratification often occurs, making it difficult to accurately determine the oil-water interface using only float density measurements, thus affecting the accuracy and reliability of the measurement.

[0003] Existing measurement devices and methods also have other limitations. For example, the traditional float method is easily affected by liquid flow velocity, lateral force, and float movement path deviation during the measurement process, leading to unstable measurement data. Furthermore, existing control systems typically lack dynamic measurement and real-time feedback capabilities, making continuous monitoring and analysis of liquid density distribution impossible. These problems make high-precision, high-efficiency liquid density measurement under complex working conditions particularly difficult. Therefore, developing a device and method that can overcome these shortcomings and achieve dynamic measurement and high-precision density detection has become a pressing technical challenge in this field.

[0004] This invention aims to achieve accurate measurement of liquid density by using a servo motor to drive the object under test to move dynamically in a liquid according to a preset step distance, and combining this with a tension sensor to collect data in real time. Simultaneously, the design of a flow stabilizing shroud reduces the interference of liquid flow velocity on the measurement, and a density-displacement curve is plotted using a data processing unit to visually reflect the liquid stratification interface and density distribution. This provides an efficient and reliable solution for measuring liquid density in large oil storage tanks. Utility Model Content

[0005] This invention addresses the problem of inconvenient sampling in existing technologies for measuring the density of liquids inside large oil tanks by proposing a dynamic liquid density measurement device based on a servo motor. The servo motor drives a float to move in the liquid at preset step distances, and a tension sensor collects the tension data of the float in real time. The liquid density is then calculated based on the dynamic equation.

[0006] The technical solution of this utility model is implemented as follows: A liquid density measuring device includes a drive device for providing a controllable drive output and a density detector disposed in the liquid being measured. It also includes a tensile testing device, which is connected between the driving device and the density testing body. The tensile testing device and the driving device are electrically connected. The driving device drives the density testing body to move in the liquid in a preset stepping manner, which is used to detect the tensile force on the density testing body in the liquid in real time.

[0007] Furthermore, the driving device is a servo motor, which receives motion commands from the processing module and provides feedback on its operating status via a communication interface.

[0008] Furthermore, the output end of the servo motor is equipped with a coupling, and the other end of the coupling is connected to the tension detection device to ensure the coaxiality between the two.

[0009] Furthermore, the tensile force detection device is a tensile force sensor, the end of which is away from the coupling is connected to the density detection body through a flexible connector.

[0010] Furthermore, the flexible connector is made of steel wire.

[0011] Furthermore, the steel wire is connected to the tension sensor via a universal connector to eliminate the influence of lateral force on the measurement.

[0012] Furthermore, the density detector is a float with a density greater than that of the liquid being measured, and its shape is an inverted cone to reduce the influence of adhering substances.

[0013] Furthermore, it also includes a flow stabilizing structure, which is placed around the density detection body to reduce the interference of liquid flow on the measurement.

[0014] Furthermore, the flow stabilizing structure is a cylindrical cover with several through holes on its sidewalls to ensure that the liquid composition inside and outside the cover is consistent.

[0015] Furthermore, it also includes a mounting structure for securing the entire device to the top of the container and keeping the entire device vertical.

[0016] The beneficial effects of the technical solution provided in this application are as follows: 1. This application achieves high-precision automated measurement of liquid density through the coordinated operation of a driving device, a density detector, a tensile testing device, and a processing module. The device utilizes a driving device to move the density detector in a preset stepping pattern within the liquid, combined with a tensile testing device to collect real-time data on the tensile force acting on the detector within the liquid. The processing module then automatically calculates the liquid density based on dynamic principles. This effectively overcomes the shortcomings of traditional manual sampling methods, such as cumbersome operation, low efficiency, and susceptibility to environmental interference, significantly improving the accuracy and reliability of the measurement. 2. This application possesses excellent dynamic measurement and real-time feedback capabilities, enabling continuous acquisition of density distribution data in opaque or stratified liquid environments without the need for multiple sampling or additional isothermal treatment. This significantly improves applicability and operational efficiency in complex industrial settings. Its overall structure is simple, its control logic is clear, and it is easily integrated into existing storage tank systems, providing the petroleum, chemical, and other industries with an efficient, stable, and easy-to-implement liquid density measurement solution. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the liquid density measuring device of this utility model; Figure 2 This is a force-displacement diagram of the present invention; Figure 3 This is the density-displacement diagram of this utility model.

[0019] In the diagram: 1. Servo motor; 2. Tension sensor; 3. Float; 4. Flow stabilizer; 5. Processing module; 6. Fixed flange; 7. Steel wire; 8. Coupling; 9. Universal connector. Detailed Implementation

[0020] The technical solution of this utility model will be clearly and completely described below with reference to its embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] This utility model provides a liquid density measuring device, combined with an attached... Figure 1 To be continued Figure 3 The specific implementation of this device is described in detail below. In this embodiment, the core components of the device include a servo motor 1, a tension sensor 2, a float 3, a flow stabilizer 4, a data processing unit 5, a fixed flange 6, a steel wire 7, a coupling 8, and a universal joint 9. These components work together to achieve dynamic and accurate measurement of liquid density, and solve the problems of inconvenient sampling, cumbersome operation, and low measurement accuracy in the prior art.

[0022] In this embodiment, the servo motor 1 serves as the driving device, and its output end is connected to the tension sensor 2 via a coupling 8. The design of the coupling 8 ensures the coaxiality between the servo motor 1 and the tension sensor 2, avoiding measurement errors caused by mechanical deviations. The servo motor 1 communicates with the data processing unit 5 through a communication interface, receiving motion commands from the data processing unit 5 and providing real-time feedback on its operating status. The stepper drive characteristics of the servo motor 1 enable it to precisely control the trajectory of the float 3 in the liquid. This precise control capability is the foundation for achieving high-precision density measurement.

[0023] One end of the tension sensor 2 is connected to the servo motor 1 via a coupling 8, and the other end is connected to the steel wire 7 via a universal joint 9. The other end of the steel wire 7 is connected to the float 3, thereby transmitting the force on the float 3 to the tension sensor 2. The design of the universal joint 9 eliminates the influence of lateral forces on the measurement, ensuring high accuracy of the data collected by the tension sensor 2. The tension sensor 2 is communicatively connected to the data processing unit 5 via a signal line, transmitting the collected tension data in real time. In practical applications, the range and accuracy of the tension sensor 2 need to be selected according to the density range of the liquid being measured to meet the measurement requirements under different working conditions.

[0024] Float 3, serving as the density detection element, is designed in an inverted cone shape with a density greater than that of the liquid being measured. This inverted cone design not only reduces the influence of substances adhering to the liquid on the measurement but also minimizes interference from liquid flow on the float 3's trajectory. The surface of float 3 undergoes special treatment, exhibiting excellent corrosion resistance and smoothness, making it suitable for long-term use in various liquid environments. The mass and volume of float 3 are rigorously calibrated during manufacturing to ensure accurate incorporation into the kinetic equations in subsequent calculations.

[0025] A flow stabilizer 4 is positioned around the float 3 to reduce interference from liquid flow on the measurement. The flow stabilizer 4 is a cylindrical cover with several evenly distributed through-holes on its sidewalls. These through-holes ensure the consistency of liquid composition inside and outside the cover while also buffering the liquid flow. The flow stabilizer 4 is made of corrosion-resistant metal, and its thickness has been precisely calculated to ensure strength while reducing overall weight. The installation position of the flow stabilizer 4 is optimized to cover the range of motion of the float 3 without obstructing its movement.

[0026] The fixed flange 6 serves as the mounting structure, used to secure the entire device to the top of the container and maintain its verticality. The fixed flange 6 is preferably an adjustable flange, connected to the top of the container by bolts. A leveling device is located at the bottom of the flange, allowing for precise vertical positioning of the device via a fine-tuning screw. During actual installation, operators adjust the angle and position of the fixed flange 6 to ensure the device is in its ideal working state. This precise positioning method avoids measurement errors caused by tilting.

[0027] Data processing unit 5 is an STM32 controller, which is communicatively connected to servo motor 1 and tension sensor 2. Data processing unit 5 measures liquid density through the following steps: S1, servo motor 1 receives motion commands from data processing unit 5, driving float 3 to move downwards at a preset step distance; S2, pauses after each step, waiting for the data collected by tension sensor 2 to stabilize; S3, records the current displacement and tension value, and transmits them to data processing unit 5; S4, data processing unit 5 calculates the liquid density according to the dynamic equation ρ=(Mg-F) / (Vg), and stores the displacement-density data; S5, repeats the above steps until float 3 reaches the set measurement depth. In this embodiment, the parameter M in the dynamic equation is the mass of float 3, g is the gravitational acceleration, F is the measured tension, and V is the volume of float 3. The liquid density value calculated by this equation has high accuracy.

[0028] Before each measurement, the data processing unit 5 performs a weight calibration operation on the float 3. Specifically, the float 3 is suspended in the air, its gravity data is collected and stored as a reference value. Subsequently, the data processing unit 5 performs a zero-point displacement calibration operation. The float 3 is placed near the liquid surface, the initial displacement value is recorded, and this value is defined as the zero point. These calibration operations significantly improve the accuracy of the measurement results.

[0029] Combined with appendix Figure 1 The overall structure of the device is clearly visible. Servo motor 1 is connected to tension sensor 2 via coupling 8. Tension sensor 2 is connected to steel wire 7 via universal joint 9. The other end of steel wire 7 is connected to float 3. Float 3 is located inside flow stabilizer 4, which is fixed to the container by a bracket. The entire device is mounted on top of the container via fixing flange 6, ensuring the device is vertical. (Attached) Figure 2 The force-displacement curve is shown, reflecting the change in force as displacement occurs when float 3 moves in the liquid. (Appendix) Figure 3 The density-displacement curves are displayed, which intuitively reflect the liquid stratification interface and density distribution.

[0030] In practical applications, this device is suitable for density measurement in large oil tanks in industries such as coal coking and chemicals. For example, in oil tanks at coking plants, the liquid often separates into layers due to the presence of components such as ammonia. The density-displacement curve of this device allows for a direct determination of the oil-water interface, providing reliable data support for the production process. Furthermore, this device can also be applied to other applications requiring high-precision density measurement, such as food processing and pharmaceuticals.

[0031] The technical advantages of this device are reflected in the following aspects: By driving the float 3 dynamically in the liquid using a servo motor 1 and combining this with real-time data acquisition by the tension sensor 2, high-precision single-measurement is achieved. The data processing unit 5 plots density-displacement curves based on the collected displacement-density data, enabling a direct assessment of the approximate height and interface position of different liquids within the tank, solving the problem of traditional methods' difficulty in dynamically monitoring liquid interfaces. The design of the flow stabilizer 4 effectively reduces the interference of liquid flow on the measurement, improving the stability and reliability of the measurement. Finally, this device is suitable for high-precision, high-efficiency measurement needs under various complex working conditions.

[0032] In summary, this invention provides an efficient and reliable liquid density measurement solution through the synergistic action of the servo motor 1, the tension sensor 2, the flow stabilizer 4, and the data processing unit 5. This solution not only solves the problems existing in the prior art but also provides new technical ideas for the field of liquid density measurement.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A liquid density measuring device, characterized in that, It includes a drive device (1) for providing controllable drive output and a density detector (3) disposed in the liquid being tested. It also includes a tensile testing device (2), which is connected between the driving device (1) and the density testing body (3). The tensile testing device (2) and the driving device (1) are electrically connected. The driving device (1) drives the density testing body (3) to move in the liquid in a preset stepping manner, which is used to detect the tensile force on the density testing body (3) in the liquid in real time.

2. The liquid density measuring device as described in claim 1, characterized in that, The driving device (1) is a servo motor.

3. The liquid density measuring device as described in claim 2, characterized in that, The output end of the servo motor is equipped with a coupling (8), and the other end of the coupling (8) is connected to the tension detection device (2) to ensure the coaxiality between the two.

4. The liquid density measuring device as described in claim 3, characterized in that, The tensile testing device (2) is a tensile sensor, and its end away from the coupling (8) is connected to the density testing body (3) through a flexible connector (7).

5. The liquid density measuring device as described in claim 4, characterized in that, The flexible connector (7) is a steel wire.

6. The liquid density measuring device as described in claim 5, characterized in that, The steel wire is connected to the tension sensor via a universal connector (9) to eliminate the influence of lateral force on the measurement.

7. The liquid density measuring device as described in claim 6, characterized in that, The density detector (3) is a float with a density greater than that of the liquid being measured, and its shape is an inverted cone to reduce the influence of adhering substances.

8. The liquid density measuring device as described in claim 1, characterized in that, It also includes a flow stabilizing structure (4), which is placed around the density detector (3) to reduce the interference of liquid flow on the measurement.

9. The liquid density measuring device as described in claim 1, characterized in that, The flow stabilizing structure (4) is a cylindrical cover with several through holes on its side wall to ensure that the liquid composition inside and outside the cover is consistent.

10. The liquid density measuring device as described in claim 1, characterized in that, It also includes an installation structure (6) for securing the entire device to the top of the container and keeping the entire device vertical.

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