A detachable side-entry ultrasonic liquid level monitoring system and method

Abstract

The application discloses a detachable side-in type ultrasonic liquid level monitoring system and method, which comprises a liquid level detection box, an ultrasonic monitoring box and a remote client; the liquid level detection box is used for being connected with a container to be detected to form a communicating vessel structure; the ultrasonic monitoring box is provided with two groups of ultrasonic probes for positioning and height measurement of a monitored liquid level, and is used for monitoring the liquid level in the liquid level detection box to obtain monitoring data; the remote client with built-in software is used for displaying the liquid level monitoring data of the ultrasonic monitoring box in real time, sorting the monitoring data and generating a regular report. The two groups of ultrasonic probes work cooperatively, the strong stability and high precision of the measurement process are ensured, the real-time monitoring function is provided, the two groups of ultrasonic probes emit sound wave signals outward every interval time given by a user, the liquid level position is determined again every interval time when the ultrasonic positioning probe group is positioned to the monitored liquid surface, manual regular inspection of the liquid surface position is not needed, and the manual work amount is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of liquid level measurement technology, and in particular to a detachable side-entry ultrasonic liquid level monitoring system and method. Background Technology

[0002] In specialized production sectors such as petroleum, chemical, and aerospace, the monitoring and control of liquid levels in closed containers is crucial for industrial automation and safe production. In these fields, the containers often store flammable, explosive, highly volatile, and highly corrosive gaseous or liquid media, rendering conventional contact-based liquid level monitoring methods unsuitable. Therefore, finding an alternative measurement method is of significant practical importance for achieving safe and efficient industrial production and accurate measurement.

[0003] Liquid level measurement methods can generally be divided into two types: direct monitoring and indirect monitoring. Indirect monitoring involves converting the liquid level signal into other relevant signals for measurement. Since the containers being measured often contain flammable, explosive, and highly corrosive media, non-contact indirect monitoring technology is becoming increasingly popular.

[0004] Ultrasonic level monitoring, as a non-contact indirect monitoring technology, has promising applications in the field of level measurement due to its high measurement accuracy and low production cost. The ultrasonic method utilizes the physical properties of ultrasound waves, such as reflection, transmission, and refraction, to measure level. This method effectively preserves the physical structure and integrity of the measured container. The level gauge provides a clear, blind-spot-free measurement throughout the entire process and offers excellent measurement advantages for flammable, explosive, highly corrosive, and highly volatile containers.

[0005] In current applications, liquid level changes are mainly monitored by on-site testing personnel, followed by liquid level measurement. This not only significantly increases the labor intensity for workers but also fails to provide real-time monitoring of the liquid level, posing safety hazards such as sudden rises or falls in the liquid level or reaching critical values. Furthermore, the accuracy and stability of ultrasonic liquid level monitoring technology need to be further improved for container conditions that are more demanding. Summary of the Invention

[0006] This invention provides a detachable side-entry ultrasonic liquid level monitoring system and method to solve the above-mentioned problems.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] A detachable side-entry ultrasonic liquid level monitoring system includes a liquid level detection box, an ultrasonic monitoring box, and a remote transmission client.

[0009] The liquid level detection box is used to connect with the container to be tested to form a communicating vessel structure;

[0010] The ultrasonic monitoring box uses two sets of ultrasonic probes installed inside the box for positioning and height measurement to monitor the liquid level in the liquid level detection box, so as to obtain monitoring data, including liquid level height data and liquid level rise and fall speed data.

[0011] The built-in software remote client is used to display the liquid level monitoring data of the ultrasonic monitoring box in real time, and to organize the monitoring data and generate periodic reports.

[0012] Furthermore, the ultrasonic monitoring box can be detachably installed on one side of the liquid level detection box;

[0013] The ultrasonic monitoring box is equipped with a mobile monitoring device. Two sets of ultrasonic probes with both transceiver and receiver are installed on the outer frame of the mobile monitoring device. The mobile monitoring device moves up and down inside the ultrasonic monitoring box via a lifting mechanism to monitor the liquid level in the liquid level detection box.

[0014] A scale positioning track is provided on the outer wall of the frame plate on the side of the outer frame support near the liquid level detection tank; the two sets of ultrasonic probes include a set of ultrasonic positioning probes and a set of ultrasonic ranging probes; the two ultrasonic positioning probes are respectively set up vertically and are slidably mounted on the scale positioning track via the base; the two ultrasonic ranging probes are respectively installed on the outer surface of the upper frame plate and the outer surface of the lower frame plate of the outer frame support of the mobile monitoring device, and the two ultrasonic ranging probes are located in the same vertical plane;

[0015] The ultrasonic monitoring box is equipped with sound wave reflecting baffles at both the top and bottom ends, which are set horizontally to reflect sound waves.

[0016] Furthermore, a temperature sensor is provided at the center of the side plate of the outer frame support near the liquid level detection box, a set of ultrasonic positioning probes are symmetrically arranged at both ends of the temperature sensor, and a heat insulation block is installed on the side of the ultrasonic positioning probes and the temperature sensor near the liquid level detection box.

[0017] Furthermore, a display panel is fixedly installed on the outer surface of the side plate of the outer frame bracket of the mobile monitoring device. The display panel is equipped with a data display screen, a control key area, and an alarm device.

[0018] Furthermore, the lifting mechanism includes a power unit and a set of ball screws arranged vertically and in parallel inside the ultrasonic monitoring box.

[0019] The lifting support nut of the ball screw is fixed to the outer surface of the base plate of the outer frame bracket; the power unit drives the ball screw to move the mobile monitoring device up and down along the two screws to monitor the liquid level in the ultrasonic monitoring box.

[0020] Furthermore, the liquid level detection box is provided with a slide rail on the side away from the container being measured, and the ultrasonic monitoring box is provided with a groove on the side close to the liquid level detection box. The ultrasonic monitoring box is installed on the slide rail through the groove, and the upper and lower ends of the ultrasonic monitoring box are fixed on the slide rail by fixing pins.

[0021] Furthermore, the upper part of the liquid level detection box is connected to the upper part of the container being tested via a gas connection pipe, and the lower part of the liquid level detection box is connected to the lower part of the container being tested via a liquid connection pipe; the top of the liquid level detection box is provided with a flushing pipe, and the bottom is provided with a drain pipe.

[0022] Furthermore, the ultrasonic monitoring box includes a main control module and a functional module capable of transmitting data to each other. The main control module is used to control the functional module to perform corresponding actions and to perform calculations on the acquired monitoring data. The calculations include calculating the monitoring pressure drop value and the distance information between the two positioning probes based on the echo sound pressure curves obtained by the two ultrasonic probes, and calculating the liquid level height data and the liquid level rise / fall speed data based on the time interval between the first ultrasonic ranging probe and the second ultrasonic ranging probe emitting and receiving their respective first reflection signals and the time interval between the two ultrasonic ranging probes emitting sound wave signals.

[0023] The functional modules include a hazard alarm module, an ultrasonic transmitting and receiving module, a data remote transmission module, a temperature module, a data display module, a motor control module, a button control module, and a power supply module.

[0024] The hazard alarm module is used to issue an alarm when the liquid level rises or falls at an abnormal rate and when the ultrasonic probe experiences an abnormal temperature. The ultrasonic transmitting and receiving module is used to transmit detection signals and receive the echo signals generated by the transmitted detection signals. The data remote transmission module is used for information transmission between the main control module and the remote transmission client.

[0025] The temperature module is used to monitor the temperature of the ultrasonic positioning probe; the data display module is used to display liquid level monitoring data; the motor control module is used to control the motor in the power unit; the button control module is used to input the monitoring parameters required by the system; and the power supply module is used to provide power to the various modules in the ultrasonic monitoring box.

[0026] The present invention also includes a monitoring method for the aforementioned detachable side-entry ultrasonic liquid level monitoring system, comprising the following steps:

[0027] The process includes an initial commissioning phase and a liquid level monitoring phase:

[0028] The initial debugging phase includes:

[0029] S1: Equipment pre-adjustment: The temperature sensor measures the working temperature of the probe. The two ultrasonic positioning probes operate independently to obtain the echo sound pressure time history curve. Based on the echo sound pressure time history curve, the monitoring pressure drop value and ultrasonic positioning probe spacing information that need to be set can be obtained. The pressure drop monitoring threshold is set and the ultrasonic positioning probe spacing is adjusted.

[0030] S2: Ultrasonic positioning: Based on the set echo sound pressure drop information, the main control module controls the power unit to drive the mobile monitoring equipment, so that a set of ultrasonic positioning probes are positioned at the gas-liquid interface and track the rise and fall of the liquid level in real time.

[0031] The liquid level monitoring stage: Once the mobile monitoring device can stably track the rise and fall of the liquid level, it begins to execute the ranging and alarm monitoring steps;

[0032] S3: Ultrasonic ranging: The ultrasonic ranging probe transmits and receives sound wave signals to calculate the liquid level height and the rate of rise and fall;

[0033] S4: Alarm Monitoring: Monitors liquid level height, liquid level rise / fall rate and probe operating temperature information, and issues an alarm on the software and display panel built into the remote computer client based on whether the alarm threshold is exceeded.

[0034] S5: The software generates various monitoring curves, reports, and detailed logs based on the monitoring data.

[0035] Compared with existing ultrasonic level monitors, the advantages of this invention are:

[0036] (1) The detachable side-entry ultrasonic liquid level monitoring system disclosed in this invention utilizes the principle of communicating vessels to obtain a stable and accurate liquid level position, ensuring a stable and accurate monitoring process.

[0037] (2) The detachable side-entry ultrasonic liquid level monitoring system disclosed in this invention firstly obtains pressure drop information by receiving sound wave signals transmitted and reflected from gas and liquid media in a set of ultrasonic positioning probes in the ultrasonic monitoring box. The pressure drop information with a certain threshold is tracked to calibrate the liquid level and locate the liquid surface. Then, the ultrasonic ranging probes at the upper and lower ends transmit and receive sound waves. The liquid level height information can be directly calculated by the time difference between the transmission and reception of the sound signals by the two ranging probes. It does not involve the influence of sound velocity information that is significantly affected by external environmental factors, making the measurement and calculation of the liquid level height more accurate and reliable. The two sets of ultrasonic probes work together with clear division of labor, are not easily affected by the external environment, have strong robustness, and can ensure strong stability and high precision in the measurement process.

[0038] (3) This system has a real-time monitoring function. The two sets of ultrasonic probes emit sound wave signals at intervals given by the user. When the ultrasonic positioning probe locates the monitored liquid surface, the liquid level position is determined again at intervals. The liquid level information monitoring is highly real-time and there is no need for manual periodic checks of the liquid surface position, which greatly reduces the amount of manual work.

[0039] (4) The computer client software can display monitoring data in real time, collect data from multiple containers in multiple threads, and organize the liquid level information of the customized stage into periodic reports, so that users can monitor, query and analyze the liquid level status of multiple containers at the same time. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the structure of a detachable side-entry ultrasonic liquid level monitoring system disclosed in an embodiment of the present invention;

[0042] Figure 2 This is a front sectional view of the ultrasonic monitoring box of a detachable side-entry ultrasonic liquid level monitoring system disclosed in an embodiment of the present invention.

[0043] Figure 3 This is a top view of a detachable side-entry ultrasonic liquid level monitoring system mobile monitoring device disclosed in an embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram of the display panel structure of a detachable side-entry ultrasonic liquid level monitoring system disclosed in an embodiment of the present invention;

[0045] Figure 5 This is a right view of a detachable side-entry ultrasonic liquid level monitoring system mobile monitoring device disclosed in an embodiment of the present invention;

[0046] Figure 6 This is a schematic diagram of the built-in module of the ultrasonic monitoring box of a detachable side-entry ultrasonic liquid level monitoring system disclosed in an embodiment of the present invention.

[0047] Figure 7 This is a schematic diagram of the real-time monitoring interface of the remote computer client software for a detachable side-entry ultrasonic liquid level monitoring system disclosed in an embodiment of the present invention. Figure 1 ;

[0048] Figure 8This is a schematic diagram of the real-time monitoring interface of the remote computer client software for a detachable side-entry ultrasonic liquid level monitoring system disclosed in an embodiment of the present invention. Figure 2 ;

[0049] Figure 9 This is a schematic diagram of the real-time monitoring interface of the remote computer client software for a detachable side-entry ultrasonic liquid level monitoring system disclosed in an embodiment of the present invention. Figure 3 ;

[0050] Figure 10 This is a schematic diagram of the report interface of the remote computer client software for a detachable side-entry ultrasonic liquid level monitoring system disclosed in an embodiment of the present invention.

[0051] Figure 11 This is a schematic diagram of the alarm and positioning interface of the remote computer client software of a detachable side-entry ultrasonic liquid level monitoring system disclosed in an embodiment of the present invention.

[0052] Figure 12 This is a schematic diagram of the settings interface of the remote computer client software for a detachable side-entry ultrasonic liquid level monitoring system disclosed in an embodiment of the present invention. Figure 1 ;

[0053] Figure 13 This is a schematic diagram of the settings interface of the remote computer client software for a detachable side-entry ultrasonic liquid level monitoring system disclosed in an embodiment of the present invention. Figure 2 ;

[0054] Figure 14 This is a schematic diagram of the settings interface of the remote computer client software for a detachable side-entry ultrasonic liquid level monitoring system disclosed in an embodiment of the present invention. Figure 3 ;

[0055] Figure 15 This is a schematic diagram of the calculation parameters of a detachable side-entry ultrasonic liquid level monitoring system disclosed in an embodiment of the present invention;

[0056] Figure 16 This is a schematic flowchart of a detachable side-entry ultrasonic liquid level monitoring system monitoring method disclosed in an embodiment of the present invention.

[0057] Figure 17 This is a flowchart illustrating the real-time liquid level positioning process of the ultrasonic positioning probe in a detachable side-entry ultrasonic liquid level monitoring system disclosed in an embodiment of the present invention.

[0058] In the diagram: 1. Liquid level detection box; 2. Ultrasonic monitoring box; 3. Container under test; 4. Gas connection pipe; 5. Liquid connection pipe; 6. Mobile monitoring equipment; 7. Outer frame support; 8. Scale positioning track; 9. Ultrasonic positioning probe; 901. First ultrasonic positioning probe; 902. Second ultrasonic positioning probe; 10. Ultrasonic ranging probe; 101. First ultrasonic ranging probe; 102. Second ultrasonic ranging probe; 11. Main control chip; 12. Temperature sensor; 13. Heat insulation block; 14. Heat insulation block fixing clip; 15. Sound wave reflecting baffle; 16. Software; 17. Power unit; 171. Servo motor; 172. Coupling; 173. Reduction gear. 18. Lifting support nut; 19. Lead screw; 20. Slide rail; 21. Fixing pin; 22. Display panel; 221. Temperature display screen; 222. Liquid level display screen; 223. Control key area; 224. Warning horn; 225. WIFI display screen; 226. Warning light; 227. USB data transmission interface; 228. Power supply; 23. Flushing pipeline; 24. Drainage pipeline; 25. Buzzer; 26. WIFI network card; 27. Buffer pad; 28. First ball valve; 29. ​​Second ball valve; 30. Third ball valve; 31. Fourth ball valve; 32. Single-disc flange bend; 33. Single-disc flange straight pipe; 34. Gas; 35. Liquid. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] like Figure 1 The image shows a detachable side-entry ultrasonic liquid level monitoring system provided in this embodiment, including a liquid level detection box 1, an ultrasonic monitoring box 2, and a remote transmission client.

[0061] The liquid level detection box 1 is used to connect with the container to be tested to form a communicating vessel structure;

[0062] The ultrasonic monitoring box 2 monitors the liquid level in the liquid level detection box 1 through two sets of ultrasonic probes installed inside the box for positioning and height measurement, so as to obtain monitoring data, including liquid level height data and liquid level rise and fall speed data.

[0063] The remote client of the built-in software 16 is used to display the liquid level monitoring data of the ultrasonic monitoring box 2 in real time, and to organize the monitoring data and generate periodic reports.

[0064] According to the principle of communicating vessels, in a closed container environment, the liquid level in the level detection tank 1 is consistent with the liquid level in the measured container 3, and the liquid surface is more stable. The level detection tank 1 is smaller than the measured container 3, with thinner walls, a more controllable and regular shape, and less prone to impurity accumulation, resulting in more accurate and stable measurement results. Furthermore, the smaller and more controllable box-shaped container makes the ultrasonic monitoring device easier to install and maintain. The level detection tank, connected to the container under test based on the principle of communicating vessels, not only obtains a more stable liquid level but also simplifies the structure of the ultrasonic monitoring device and saves costs due to controllable tank parameters.

[0065] The detachable side-entry ultrasonic liquid level monitoring system and method disclosed in this invention utilizes the principle of communicating vessels to obtain a stable and accurate liquid level position, ensuring a stable and accurate monitoring process.

[0066] The ultrasonic monitoring box contains a set of ultrasonic positioning probes that receive pressure drop information from sound wave signals projected and reflected from gaseous and liquid media. By tracking pressure drop information with a certain threshold, the liquid level is calibrated and the liquid surface is located. Then, through ultrasonic ranging probes at both ends transmitting and receiving sound waves, the liquid level height information can be directly calculated from the time difference between the transmitted and received sound signals of the two ranging probes. This eliminates the influence of sound velocity information, which is significantly affected by external environmental factors, making the measurement and calculation of the liquid level height more accurate and reliable. The two sets of ultrasonic probes work collaboratively with a clear division of labor, making them less susceptible to external environmental influences. The system is robust, ensuring strong stability and high precision in the measurement process. It features real-time monitoring; two sets of ultrasonic probes emit sound signals at user-defined intervals. When the ultrasonic positioning probe locates the monitored liquid surface, the liquid level is re-established at intervals, providing real-time liquid level monitoring and eliminating the need for regular manual checks, significantly reducing manual workload. The computer client software displays monitoring data in real-time, performs multi-threaded data acquisition from multiple containers, and compiles liquid level information from customized stages into periodic reports, facilitating simultaneous monitoring, querying, and analysis of liquid levels in multiple containers.

[0067] In a specific embodiment, the ultrasonic monitoring box 2 can be detachably installed on one side of the liquid level detection box 1;

[0068] like Figure 1 , Figure 2 As shown, the ultrasonic monitoring box 2 is equipped with a mobile monitoring device 6 inside. Two sets of ultrasonic transceiver probes are installed on the outer frame support 7 of the mobile monitoring device 6. The mobile monitoring device 6 moves up and down inside the ultrasonic monitoring box 2 through a lifting mechanism to monitor the liquid level in the liquid level detection box 1.

[0069] A scale positioning track 8 is provided on the outer wall of the frame plate on the side of the outer frame support 7 near the liquid level detection box 1; the two sets of ultrasonic probes include a set of ultrasonic positioning probes 9 and a set of ultrasonic ranging probes 10; the two ultrasonic positioning probes 9 are respectively set up vertically and are slidably mounted on the scale positioning track 8 through the base; the two ultrasonic ranging probes 10 are respectively installed on the outer surface of the upper frame plate and the outer surface of the lower frame plate of the outer frame support 7 of the mobile monitoring device 6, and the two ultrasonic ranging probes are set in the same vertical plane for measuring the liquid level height at a certain time point;

[0070] The ultrasonic monitoring box 2 has horizontally arranged sound wave reflecting baffles 15 at both the upper and lower ends to reflect sound waves, ensuring accurate measurement of the liquid level. The sound wave reflecting baffles 15 have second pin holes through which fixing pins 21 for fixing the ultrasonic monitoring box 2 to the liquid level detection box 1 pass, ensuring the structural rigidity of the system during operation.

[0071] In this embodiment, the base is equipped with a pre-tightening spring to provide pre-tightening force for the ultrasonic positioning probe, so as to ensure that the ultrasonic positioning probe is tightly attached to the external heat insulation block 13 through the coupling agent.

[0072] The side-entry ultrasonic monitoring box locates the liquid level by receiving two sets of sound pressure differences obtained from the transmitted and reflected sound wave signals from the gas and liquid media, respectively, using a first ultrasonic positioning probe 901 and a second ultrasonic positioning probe 902. In the liquid medium with higher impedance, the echo sound pressure received by the probe is much smaller than the echo sound pressure transmitted and reflected by the gas medium. Therefore, when the moving monitoring device appears at the liquid surface, there is a stable and obvious pressure drop value. Tracking the pressure drop information with a certain threshold can calibrate the liquid level. In reality, the gas and liquid impedances differ greatly, so this measurement method provides a clearer and more accurate definition of the liquid level. The ultrasonic ranging probe group is set at the upper and lower ends of the monitoring device, transmitting and receiving sound signals into the air. Because the reflection and transmission of sound waves are relatively simple, and the liquid level height information can be directly obtained by a simple formula of the time difference between the transmitted and received sound signals of the two ranging probes, without involving sound velocity information that is significantly affected by environmental factors, the measurement and calculation of the liquid level height value is more accurate and reliable, and less affected by the environment.

[0073] In a specific embodiment, a temperature sensor 12 is provided at the center of the side plate of the outer frame bracket 7 near the liquid level detection tank 1. A set of ultrasonic positioning probes 9 are symmetrically arranged at both ends of the temperature sensor 12, and a heat insulation block 13 is installed on the side of the set of ultrasonic positioning probes 9 and the temperature sensor 12 near the liquid level detection tank 1. Figure 3 , Figure 4As shown, the outer wall of the side plate of the outer frame bracket near the liquid level detection box is provided with a heat insulation block fixing clip 14 arranged vertically, and the heat insulation block 13 is installed in the heat insulation block fixing clip 14; in this embodiment, both sides of the heat insulation block 13, namely the side in contact with the ultrasonic positioning probe 9 and the side near the liquid level detection box 1, are coated with coupling agent. The heat insulation block 13 has an arc protruding towards the liquid level detection box 1 to ensure that the heat insulation block 13 and the liquid level detection box 1 are in close contact through the coupling agent; the heat insulation block 13 is made of mica gasket. The heat insulation block 13 is used to protect the ultrasonic positioning probe 9 from high temperature damage, and the temperature of the heat insulation block is monitored in real time by the temperature sensor 12 to ensure that it is replaced before failure; Figure 5 As shown, two ultrasonic positioning probes 9 are symmetrically arranged in the scale positioning rails on both sides of the temperature sensor 12, and can be moved up and down as needed to avoid mutual interference between the acoustic signals emitted and received by the two ultrasonic positioning probes 9. At the same time, it also has better adaptability to different gas and liquid media conditions, container conditions and different models of liquid level detection boxes.

[0074] Specifically, in this embodiment, the liquid level height measurement range of this monitoring system is 0-1500mm; the permissible operating temperature of the equipment is 0-350℃, and the temperature monitoring range, i.e., the temperature limit of the heat insulation block, is 0-60℃; the input voltage of the ultrasonic monitoring box 2 is DC24V / AC220V, and the output form is 4-20mA superimposed HART.

[0075] In a specific embodiment, such as Figure 4 As shown, a display panel 22 is fixedly installed on the outer surface of the side plate of the outer frame bracket 7 of the mobile monitoring device 6. The display panel is equipped with a data display screen, a control key area, and an alarm device. The alarm device includes an alarm light and an alarm horn for alarming and displaying dangerous water levels and critical temperatures. The data display screen includes a temperature display screen 221 for displaying the probe temperature at the previous time point, a liquid level display screen 222, and a WIFI display screen 225 for displaying the network connection status of the device. The control key area 223 is used by the operator to set parameters such as the initial height of the device and the monitored pressure drop, as well as to control the network connection and the opening and closing status of the ultrasonic probe group. The USB data transmission interface 227 on the display panel 22 is used to provide wired data transmission for the ultrasonic monitoring box 2.

[0076] Specifically, in this embodiment, the mobile monitoring device 6 is also equipped with a buzzer 25 and a WIFI network card 26 connected to the main control module. The buzzer 25 is used to provide a buzzing alarm in dangerous situations, and the WIFI network card 26 is used to realize the remote transmission function of monitoring data.

[0077] In a specific embodiment, the lifting mechanism includes a power unit 17 and a set of ball screws arranged vertically inside the ultrasonic monitoring box 2 and arranged in parallel.

[0078] The lifting support nut 18 of the ball screw is fixed to the outer surface of the base plate of the outer frame bracket 7; the power unit 17 drives the ball screw to move the mobile monitoring device 6 up and down along the two screws 19 to monitor the liquid level in the ultrasonic monitoring box 2.

[0079] Specifically, in this embodiment, the power unit 17 is located at the bottom of the ultrasonic liquid level detection box; the power unit 17 includes a servo motor 171, a coupling 172, and a reducer 173; the bottom of the lead screw 19 is connected in sequence along the horizontal direction to the reducer 173, the coupling 172, and the servo motor 171; a set of ball screws can bring better stability when the mobile monitoring device 6 moves up and down; the servo motor 171 receives the command from the main control chip 11 to rotate forward or reverse, and drives the mobile detection device 6 to rise or fall along the lead screw 19 through the coupling 172 and the reducer 173, ensuring that the mobile monitoring device 6 tracks and positions the liquid level; the upper and lower ends of the two lead screws 19 of the ball screw are equipped with shock-absorbing buffer pads 27 and bearing parts for support, which can bring stability to the rotation of the lead screw 19 structure and effectively prevent the mobile monitoring device 6 from being damaged by impact due to sudden power cut-off and excessively rapid liquid level rise and fall.

[0080] Since both sets of ball screws are located on the side of the ultrasonic monitoring box 2 away from the liquid level detection box 1, the monitoring end of the mobile monitoring device 6, which is the end with the ultrasonic positioning probe 9, forms a cantilever beam structure with the ball screw assembly. To prevent wear of the screw mechanism caused by long-term operation of the equipment, in this embodiment, a counterweight of a certain weight is set at one end of the display panel 22 of the mobile detection device 6 to ensure the weight balance at both ends and improve the service life of the equipment.

[0081] In a specific embodiment, the liquid level detection box 1 is provided with a slide rail 20 on the side away from the container 3 being measured, and the ultrasonic monitoring box 2 is provided with a groove on the side close to the liquid level detection box 1. The ultrasonic monitoring box 2 is mounted on the slide rail 20 through the groove. The slide rail 20 has a positioning groove at its end. The upper and lower ends of the ultrasonic monitoring box 2 are provided with first pin holes. Fixing pins 21 pass through the first pin holes at the upper and lower ends of the box and extend into the positioning groove, fixing the upper and lower ends of the ultrasonic monitoring box 2 onto the slide rail 20. This ensures that the side-entry ultrasonic monitoring box 2 can fit tightly against the side wall of the liquid level detection box 1 and operate stably. The groove and slide rail 20 also make the ultrasonic monitoring box 2 easy to install and disassemble, so as to adapt to being installed on different liquid level detection boxes for liquid level detection. It also facilitates the maintenance and replacement of the ultrasonic monitoring box 2.

[0082] In a specific embodiment, the upper part of the liquid level detection box 1 is connected to the inspection port at the upper end of the container to be tested 3 via a gas connecting pipe 4, a first ball valve 28, and a single-flange elbow 32. The lower part of the liquid level detection box 1 is connected to the inspection port at the lower end of the container to be tested 3 via a liquid connecting pipe 5, a second ball valve 29, and a single-flange straight pipe 33. Specifically, in this embodiment, the liquid level detection box 1 is a cylindrical container, and the valve is a stainless steel ball valve. The flushing pipe 23, the drain pipe 24, the gas connecting pipe 4, and the liquid connecting pipe 5 are all single-ended external threaded pipes or single-ended internal threaded pipes made of low-alloy heat-resistant steel. The unthreaded end of the flushing pipe 23 is welded to the liquid level detection box 1, and the other end of the flushing pipe 23 is connected to the third ball valve 30 via an external threaded interface or an internal threaded interface. The unthreaded end of the drain pipe 24 is welded to the liquid level detection box 1, and the other end of the drain pipe 24 is connected via an external threaded interface. The interface or internal thread interface is connected to the fourth ball valve 31; the unthreaded end of the gas connection pipe 4 is welded and fixed to the side panel of the liquid level detection box 1, and the other end of the gas connection pipe 4 is connected to one end of the first ball valve 28 through an external thread interface or internal thread interface; the unthreaded end of the liquid connection pipe 5 is welded and fixed to the side panel of the liquid level detection box 1, and the other end of the liquid connection pipe 5 is connected to the second ball valve 29 through an external thread interface or internal thread interface; the single flange bend 32 and the single flange straight pipe 33 are also made of low alloy heat-resistant steel. The flangeless end of the single flange bend 32 is connected to the first ball valve 28 through an external thread interface or internal thread interface, and the flange end of the single flange bend 32 is connected to the upper inspection port flange end of the container to be tested 3; the flangeless end of the single flange straight pipe 33 is connected to the second ball valve 29 through an external thread interface or internal thread interface, and the flange end of the single flange straight pipe 33 is connected to the lower inspection port flange end of the container to be tested 3.

[0083] The liquid level detection box 1 is equipped with a flushing pipe 23 at the top and a drain pipe 24 at the bottom, which makes it easier to clean the impurities deposited inside the liquid level detection box 1. Removing the impurities can reduce the error during detection.

[0084] In a specific embodiment, the ultrasonic monitoring box 2 includes a main control module and functional modules capable of transmitting data to each other. The main control module is used to control the functional modules to perform corresponding actions and to perform calculations on the acquired monitoring data. The calculations include calculating the monitoring pressure drop value and the distance information between the two positioning probes based on the echo sound pressure curves obtained from the two ultrasonic probes, and calculating the liquid level height data and the liquid level rise / fall speed data based on the time interval between the first ultrasonic ranging probe 101 and the second ultrasonic ranging probe 102 transmitting and receiving their respective first reflected signals and the time interval between the two ultrasonic ranging probes 10 transmitting sound wave signals. The functional modules include a hazard alarm module, an ultrasonic transmitting and receiving module, a data remote transmission module, a temperature module, a data display module, a motor control module, a button control module, and a power supply module.

[0085] The hazard alarm module is used to issue alarms when the liquid level rises or falls abnormally and when the ultrasonic probe experiences abnormal temperature. The ultrasonic transmitting and receiving module is used to transmit detection signals and receive the echo signals generated by the transmitted detection signals. The data transmission module is used for information transmission between the main control module and the software 16 built into the remote transmission client. The data transmission module can be a WiFi wireless transmission device or a wired transmission device. The temperature module is used to monitor the temperature of the ultrasonic positioning probe. The data display module is used to display the liquid level monitoring data. The motor control module is used to control the motor in the power unit. The button control module is used to input the monitoring parameters required by the system. The monitoring parameters include: the distance between the base of the chamber and the bottom boundary of the container under test, the monitoring alarm threshold, and the echo sound pressure drop information used for monitoring. The power supply module is used to provide power to the various modules in the ultrasonic monitoring chamber.

[0086] Specifically, in this embodiment, data is transmitted using a WiFi wireless transmission device, but wired data transmission can also be used; the main control module is an STM32 series main control chip 11;

[0087] The software 16 built into the remote transmission computer client can be installed on any computer terminal with data remote transmission and storage capabilities, enabling multi-threaded real-time monitoring of liquid level data from multiple containers. The software interface can be divided into function areas and data areas according to its purpose; users can perform relevant data queries and function settings by clicking function buttons on the designated areas. Figure 7As shown, the function area includes five operation functions: user login, real-time monitoring, reporting, alarm and location, and settings; the data area can display monitoring content including local time, liquid level in the container under test, liquid level in the container under test time history curve, liquid level rise and fall rate in the container under test, liquid level rise and fall rate time history curve in the container under test, probe operating temperature, probe operating temperature time history curve, monitoring data feedback and report details log, etc.

[0088] The real-time monitoring function of the software built into the remote computer client, such as... Figure 7-9 As shown, it can track and display the monitoring data and time-history curves of the liquid level height, liquid level rise and fall rate and probe temperature inside the container for the user-specified container in real time, and give feedback on abnormal monitoring data in real time.

[0089] The reporting function of the software 16 built into the remote computer client, such as... Figure 10 It can organize monitoring data within a specified time period and generate reports in three formats: daily, monthly, and annual reports, and provide monitoring details logs for the relevant reports. Users can change and set the time range of the pre-generated reports. The system's default report generation time range is from the start time to the end time of the target report, such as 0:00 to 24:00 on the target date for a daily report. In addition, users can also export the required reports as needed.

[0090] The remote computer client has built-in software 16 with alarm and location functions, such as... Figure 11 It provides intuitive feedback on monitoring information from multiple containers, allowing users to simultaneously observe the monitoring status of each container, including probe temperature, liquid level, liquid level rise / fall rate, and alarm information, quickly identifying hazardous containers. Furthermore, users can replace currently designated monitoring containers and add new monitoring containers on this interface.

[0091] The settings functions of the built-in software 16 in the remote computer client, such as... Figure 12-14 As shown, the system includes three modules: time / WIFI settings, parameter settings, and accuracy calibration. In parameter settings, users can specify the initial monitoring height and alarm threshold for the monitored quantity. In accuracy calibration, users can set the pre-monitoring pressure drop information, set the sound pressure threshold, and obtain the inter-probe spacing information based on the echo sound pressure curves of the two ultrasonic positioning probes. This system has the function of wired or wireless network data transmission. The monitoring data is accurately fed back to the terminal software interface after processing. It has strong real-time performance and can realize multi-threaded monitoring. It can integrate monitoring data, which is convenient for later processing and summarization, and simplifies the tedious and monotonous work process of the staff.

[0092] The present invention also includes a monitoring method for the detachable side-entry ultrasonic liquid level monitoring system described above, the flowchart of which is shown below. Figure 16As shown, it includes the following steps:

[0093] The process includes an initial commissioning phase and a liquid level monitoring phase:

[0094] Phase 1: Initial Equipment Commissioning: During the initial installation phase, personnel need to input the required monitoring parameters for the system onto the software 16 built into the remote computer client or the display panel 22 of the side-entry ultrasonic monitoring box. These parameters include: the distance between the box base and the bottom boundary of the container under test, the monitoring alarm threshold, and the echo sound pressure drop information used for monitoring. The stability of the equipment will also be verified. This phase can be further divided into two steps: pre-adjustment and ultrasonic positioning. The specific operations are as follows:

[0095] S1: Pre-adjustment: Set the initial height Δh, liquid level, lifting rate alarm threshold, and probe operating temperature alarm threshold on the parameter setting interface of the side-entry ultrasonic monitoring box display panel 22 or the software 16 built into the remote computer client. Then, connect the liquid level detection box to the container under test to obtain a stable gas-liquid interface. The temperature sensor 12 measures the temperature of the heat insulation block 13, which is the operating temperature of the ultrasonic positioning probe 9. If the temperature exceeds the temperature limit range of the heat insulation block 13, the display panel 22 or the software 16 built into the remote computer client will send a temperature alarm reminder message to the operator.

[0096] Then, the ultrasonic positioning probe 9 is controlled to operate independently via the display panel 22, allowing the mobile monitoring device 6 to slide up and down on one side of the liquid level detection box slide rail to detect the liquid level, obtaining the echo sound pressure curve 1 of the ultrasonic positioning probe 901; the ultrasonic positioning probe 901 is then turned off, and the ultrasonic positioning probe 902 is controlled to perform the same operation, obtaining the echo sound pressure curve 2 of the ultrasonic positioning probe 902. Based on the two sets of echo sound pressure curves, the required monitoring pressure drop value and probe spacing information can be obtained, such as... Figure 14 As shown, the data processing is as follows:

[0097] a) The formula for calculating the pressure drop ΔP is: ΔP=dc or (d′-c′), theoretically dc=d′-c′;

[0098] b) The recommended distance s between ultrasonic positioning probe groups is calculated using the formula: s = ab or (a′-b′), theoretically ab = a′-b′.

[0099] Where: a is the maximum height of the first ultrasonic positioning probe 901 from the bottom surface while keeping the echo sound pressure value of the probe constant in a pure liquid environment; b is the minimum height of the ultrasonic positioning probe 901 from the bottom surface while keeping the echo sound pressure value of the probe constant in a pure gas environment; a′ and b′ are the relevant heights of the second ultrasonic positioning probe 902; c and c′ are the echo sound pressure values ​​obtained by the ultrasonic positioning probe at heights a and a′, respectively; and d and d′ are the echo sound pressure values ​​obtained by the ultrasonic positioning probe at heights b and b′, ​​respectively.

[0100] Based on the calculated values ​​of the monitored pressure drop and inter-group distance, the settings are made on the software 16 built into the remote computer client or on the display panel 22, and the distance between the symmetrically arranged ultrasonic positioning probes 9 on the mobile monitoring device 6 is manually adjusted. During this process, the staff can set the required pressure drop monitoring threshold according to the specific usage situation. Finally, the device is pre-executed to ensure that a stable and correct measurement value can be obtained. The pre-adjustment operation of stage one is completed.

[0101] S2: Ultrasonic Positioning: The detachable side-entry ultrasonic liquid level monitoring system begins its initial operation. The first ultrasonic positioning probe group 901 and the first ultrasonic positioning probe group 902 obtain the echo sound pressure curves at the current position. The main control chip 11 compares the processed sound pressure information with the monitored pressure drop value. If the pressure drop value does not reach the monitored pressure drop and both sets of echo sound pressure values ​​are within a small range, the main control chip 11 drives the servo motor 171 to rotate, causing the mobile monitoring device 6 to move upward. Conversely, it drives the servo motor 171 to reverse, causing the device to move downward until it is positioned at the liquid level. Finally, the mobile monitoring device 6 tracks the changes in the liquid level, and the ultrasonic positioning operation of stage one is completed.

[0102] Phase Two: Liquid Level Monitoring: Once the initial commissioning phase of the equipment is completed, if the detachable side-entry ultrasonic liquid level monitoring system disclosed in this invention can stably complete real-time liquid level positioning independently, then the subsequent Phase Two process begins. During this process, the equipment begins to convert liquid level information and perform monitoring and early warning functions. This phase can be further divided into two steps: ultrasonic ranging and alarm monitoring.

[0103] like Figure 17 As shown, the real-time liquid level positioning process of the ultrasonic probe is as follows:

[0104] The first ultrasonic positioning probe 901 and the second ultrasonic positioning probe 902 transmit and receive acoustic signals to the liquid level detection tank 1 at intervals t′ to obtain the echo sound pressure information at the current time node. If the obtained echo sound pressure value changes and the pressure drop between the probes exceeds a certain threshold monitoring pressure drop, it proves that the liquid level has changed. When the two sets of echo sound pressure values ​​obtained by the probe group are small, it proves that the liquid level has moved upward. Then, the main control chip 11 drives the servo motor 171 to make the mobile monitoring device 6 track the liquid level upward, and vice versa. When the pressure drop value returns to the permissible monitoring pressure drop range, it indicates that the mobile monitoring device 6 has repositioned itself at the liquid level. This process is repeated in real time to track and monitor the liquid level. t′ represents the time interval between each transmission of acoustic signals by the first ultrasonic positioning probe 901 and the second ultrasonic positioning probe 902, which can be set on the display panel 22 or the remote computer client software 16 interface.

[0105] It should be noted that the above-mentioned "small echo sound pressure values ​​of the two sets" means that at this time point, the echo sound pressure values ​​of the positioning probe are not within the monitoring echo sound pressure values ​​of the gas medium, and vice versa.

[0106] S3: Ultrasonic ranging: When the mobile monitoring device 6 tracks the liquid surface position at a certain height, the first ultrasonic ranging probe 101 at the top of the device and the second ultrasonic ranging probe 102 at the bottom emit sound wave signals upward and downward simultaneously, and start timing synchronously. After receiving the echo signal from the reflective baffle 15, the time difference t1 and t2 of each probe are recorded and stored through the autocorrelation calculation of the program.

[0107] The time interval between each transmission of sound wave signals by the first ultrasonic ranging probe 101 and the second ultrasonic ranging probe 102 is Δt, which can be set by the display panel 22 or the software 16 built into the remote computer client. Thus, the actual height and rate of rise and fall of the liquid level are obtained, and the data processing is as follows:

[0108] a) The actual liquid level height H at a certain signal transmission and reception time j The calculation formula is:

[0109] b) The actual rate of rise and fall of the liquid level at a certain signal transmission and reception time, V j The calculation formula is: V j =(H j -H j-1 ) / Δt.

[0110] In the formula: H is the actual liquid level height, h3 is the interval between the probe surfaces of the ultrasonic ranging probe group, and h0 is the distance between the upper and lower reflective baffles (e.g., Figure 15As shown, h0 = h1 + h2 + h3), where h1 is the distance from the ultrasonic ranging probe 1 to the upper reflective baffle, and h2 is the distance from the ultrasonic probe 2 to the lower reflective baffle; H j V is the actual height of the liquid level at a pre-calculated signal transmission / reception moment, i.e., the specific height value that determines the liquid surface position at that moment. j H represents the real-time rate of rise and fall of the liquid level at the moment of signal transmission and reception. j-1 For H j The actual liquid level height at the time of the previous signal transmission and reception.

[0111] S4: Alarm Monitoring: After the above signal processing, all data on the liquid level height information have been obtained. When the monitored liquid level height and liquid level rise / fall rate exceed the alarm threshold set in the pre-adjustment step, the system will issue an audible and visual alarm on the display panel 22 of the side-entry ultrasonic liquid level monitoring box and provide alarm feedback on the real-time monitoring, alarm, and positioning interface of the software 16 built into the remote computer client. The probe temperature monitoring begins after the temperature alarm threshold is set and continues throughout the initial adjustment and formal operation of the equipment. When the probe operating temperature alarm is triggered, it indicates that the function of the heat insulation block has failed, and personnel need to replace it to ensure the safety of the equipment from thermal damage. When there is no data displayed on the display panel 22 and the software 16 interface built into the remote computer client, personnel should first check whether the equipment power is connected and determine whether the positioning probe—heat insulation block—liquid level tank is well coupled through the coupling agent. If the above tests are all normal, it indicates that the equipment is damaged and needs to be returned to the factory for repair.

[0112] S5: Finally, the system organizes the monitoring data to generate various monitoring curves, reports, and feedback logs.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A detachable side-entry ultrasonic liquid level monitoring system, characterized in that, It includes a liquid level detection box (1), an ultrasonic monitoring box (2), and a remote transmission client; The liquid level detection box (1) is used to connect with the container being measured (3) to form a communicating vessel structure; The ultrasonic monitoring box (2) monitors the liquid level in the liquid level detection box (1) through two sets of ultrasonic probes installed inside the box for positioning and height measurement, so as to obtain monitoring data, including liquid level height data and liquid level rise and fall speed data; The remote client of the built-in software (16) is used to display the liquid level monitoring data of the ultrasonic monitoring box (2) in real time and to organize and generate periodic reports on the monitoring data; the ultrasonic monitoring box (2) can be detachably installed on one side of the liquid level detection box (1). The ultrasonic monitoring box (2) is equipped with a mobile monitoring device (6) inside. Two sets of ultrasonic probes with combined transmitting and receiving are installed on the outer frame bracket (7) of the mobile monitoring device (6). The mobile monitoring device (6) moves up and down inside the ultrasonic monitoring box (2) through a lifting mechanism to monitor the liquid level in the liquid level detection box (1). The outer frame support (7) is provided with a scale positioning track (8) on the outer wall of the frame plate on the side close to the liquid level detection box (1); the two sets of ultrasonic probes include a set of ultrasonic positioning probes (9) and a set of ultrasonic ranging probes (10); the two ultrasonic positioning probes (9) are respectively set up vertically and are slidably installed on the scale positioning track (8) through the base; the two ultrasonic ranging probes (10) are respectively installed on the outer surface of the upper frame plate and the outer surface of the lower frame plate of the outer frame support (7) of the mobile monitoring device (6), and the two ultrasonic ranging probes are located in the same vertical plane; The ultrasonic monitoring box (2) has sound wave reflecting baffles (15) set in the horizontal direction at both the upper and lower ends.

2. The detachable side-entry ultrasonic liquid level monitoring system according to claim 1, characterized in that, A temperature sensor (12) is provided at the center of the side plate of the outer frame bracket (7) near the liquid level detection box (1). A set of ultrasonic positioning probes (9) are symmetrically arranged at both ends of the temperature sensor (12), and a heat insulation block (13) is installed on the side of the set of ultrasonic positioning probes (9) and the temperature sensor (12) near the liquid level detection box (1).

3. The detachable side-entry ultrasonic liquid level monitoring system according to claim 2, characterized in that, The outer surface of the side plate of the outer frame bracket (7) of the mobile monitoring device (6) is fixedly installed with a display panel (22), which is provided with a data display screen, a control key area and an alarm device.

4. A detachable side-entry ultrasonic liquid level monitoring system according to claim 3, characterized in that, The lifting mechanism includes a power unit (17) and a set of ball screws arranged vertically inside the ultrasonic monitoring box (2) and arranged in parallel. The lifting support nut (18) of the ball screw is fixed on the outer surface of the base plate of the outer frame bracket (7); the power device (17) drives the ball screw to move the mobile monitoring device (6) up and down along the two screws (19) to monitor the liquid level in the ultrasonic monitoring box (2).

5. A detachable side-entry ultrasonic liquid level monitoring system according to claim 4, characterized in that, The liquid level detection box (1) is provided with a slide rail (20) on the side away from the container (3) being measured. The ultrasonic monitoring box (2) is provided with a groove on the side close to the liquid level detection box (1). The ultrasonic monitoring box (2) is installed on the slide rail (20) through the groove, and the upper and lower ends of the ultrasonic monitoring box (2) are fixed on the slide rail (20) by fixing pins (21).

6. A detachable side-entry ultrasonic liquid level monitoring system according to claim 5, characterized in that, The upper part of the liquid level detection box (1) is connected to the upper part of the container under test (3) through a gas connection pipe (4), and the lower part of the liquid level detection box (1) is connected to the lower part of the container under test (3) through a liquid connection pipe (5); the top of the liquid level detection box (1) is provided with a flushing pipe (23), and the bottom is provided with a sewage discharge pipe (24).

7. A detachable side-entry ultrasonic liquid level monitoring system according to claim 6, characterized in that, The ultrasonic monitoring box (2) includes a main control module and a functional module that can transmit data to each other. The main control module is used to control the functional module to perform corresponding actions and to calculate and process the obtained monitoring data. The calculation and processing includes calculating the monitoring pressure drop value and the distance information between the two positioning probes based on the echo sound pressure curves obtained by the two ultrasonic probes, and calculating the liquid level height data and the liquid level rise and fall speed data based on the time interval between the first ultrasonic ranging probe (101) and the second ultrasonic ranging probe (102) transmitting and receiving their respective first reflection signals and the time interval between the two ultrasonic ranging probes (10) transmitting sound wave signals. The functional modules include a hazard alarm module, an ultrasonic transmitting and receiving module, a data remote transmission module, a temperature module, a data display module, a motor control module, a button control module, and a power supply module. The hazard alarm module is used to issue an alarm when the liquid level rises or falls at an abnormal rate and when the ultrasonic probe experiences an abnormal temperature. The ultrasonic transmitting and receiving module is used to transmit detection signals and receive the echo signals generated by the transmitted detection signals. The data remote transmission module is used for information transmission between the main control module and the remote transmission client. The temperature module is used to monitor the temperature of the ultrasonic positioning probe; the data display module is used to display liquid level monitoring data; the motor control module is used to control the motor in the power unit; the button control module is used to input the monitoring parameters required by the system; and the power supply module is used to provide power to the various modules in the ultrasonic monitoring box.

8. The monitoring method of the detachable side-entry ultrasonic liquid level monitoring system according to claim 7, characterized in that, Includes the following steps: The process includes an initial commissioning phase and a liquid level monitoring phase: The initial debugging phase includes: S1: Equipment pre-adjustment: The temperature sensor (12) measures the working temperature of the probe. The two ultrasonic positioning probes (9) operate separately to obtain the echo sound pressure time history curve. According to the echo sound pressure time history curve, the monitoring pressure drop value and the ultrasonic positioning probe (9) spacing information that need to be set can be obtained. The pressure drop monitoring threshold is set and the ultrasonic positioning probe (9) spacing is adjusted. S2: Ultrasonic positioning: According to the set echo sound pressure drop information, the main control module (11) controls the power unit (17) to drive the mobile monitoring device (6) so that a set of ultrasonic positioning probes (9) are positioned at the gas-liquid interface and track the rise and fall of the liquid level in real time. The liquid level monitoring stage: after the mobile monitoring device (6) can stably track the changes in the liquid level, it begins to perform the distance measurement and alarm monitoring steps; S3: Ultrasonic ranging: The ultrasonic ranging probe (10) transmits and receives sound wave signals and calculates the liquid level height and the rate of rise and fall. S4: Alarm monitoring: Monitor liquid level height, liquid level rise and fall rate and probe operating temperature information, and issue an alarm in the software (16) and display panel (22) built into the remote computer client based on whether the alarm threshold is exceeded; S5: The software (16) generates various monitoring curves, reports and detailed logs based on the monitoring data.

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