Device and method for liquid level measurement and data collection

Abstract

The invention discloses a liquid level measurement and data collection device and method, and relates to the technical field of liquid level detection, the device comprises a shell, a contact measurement point part, a signal collection and control part, an electromagnetic telescopic part and a wire wheel part, the electromagnetic telescopic part and the wire wheel part are arranged in the shell, and the contact measurement point part is electrically connected with the signal collection and control part through an electrified wire; the electromagnetic telescopic part comprises a mounting fixing rod, an iron core, a spring coil and a shunt; the line wheel part comprises a driving line wheel take-up and pay-off device and a steering line wheel; the contact measuring point part comprises a wiring branch port, a central measuring point and an inner ring measuring point. The liquid level sensor can adapt to dynamic change measurement of different liquid level heights, effectively reduces influences of interference factors such as liquid level suspended solids and foam through an up-and-down repeated movement mechanism of the contact measuring point part, achieves stable and reliable liquid level detection, is suitable for complex working conditions containing crystal substances or floating impurities, and is good in anti-interference capacity and high in reliability. And the device can be applied to various equipment facilities.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid level detection, and in particular to a liquid level measurement and data collection device and method. BACKGROUND

[0002] Liquid level meters are industrial instruments for measuring liquid height, which are core monitoring equipment of industrial process parameters (liquid level, temperature, pressure, flow). They convert liquid level changes into readable signals through physical principles and are widely used in chemical industry, energy, storage and transportation, etc.

[0003] Existing liquid level measurement technologies mainly include bypass type glass tube liquid level meters, potential point type liquid level meters, radar type and ultrasonic type, each type of liquid level meter has its own suitable conditions and usage. In actual use, different types of liquid level meters are selected according to different material requirements and installation conditions. However, for dynamic liquid level measurement in a container, for example, using a bypass type glass tube liquid level meter or a potential point type liquid level meter, it is easy to damage and has poor precision, especially when there is foam and suspended crystalline material, there will be some differences between the actual liquid composition in the bypass tube and the container, causing inaccurate measurement. Although the radar type liquid level meter has high precision, it is easily disturbed by liquid surface foam, and the equipment cost is high. The ultrasonic type liquid level meter is easily disturbed by suspended matter and bubbles in the liquid, causing inaccurate measurement. Therefore, there is an urgent need for a low-cost, high-precision and strong anti-interference liquid level measurement and data collection device and method to solve the above technical problems. SUMMARY

[0004] The purpose of the present application is to design a low-cost and high-precision liquid level detection method and device that can adapt to dynamic changes in liquid level and reduce the interference of foam and suspended matter in the measured liquid, and can output liquid surface data and change data in digital-analog form to facilitate connection to other data interfaces.

[0005] The present application provides the following technical scheme: a liquid level measurement and data collection device, comprising a housing, a contact measurement point part, a signal collection and control part, and an electromagnetic telescopic part and a wire wheel part arranged in the housing, the contact measurement point part being electrically connected to the signal collection and control part through a power supply wire; The electromagnetic telescopic part comprises a fixed mounting rod, a core, a spring coil and a shunt, the upper part of the core is fixed with the fixed mounting rod, the upper part of the shunt is connected with the spring coil through an insulating material, and the lower part is connected with the wire wheel part, and the upper end of the spring coil is fixedly connected with the housing; The wire wheel part comprises a driving wire wheel collector and a steering wire wheel, the driving wire wheel collector is fixedly arranged in the housing, and the driving wire wheel collector is driven to rotate by a motor, the motor is electrically connected with the signal collection and control part through a motor power supply wire, and the steering wire wheel is connected with the shunt through a connecting piece. The contact point part comprises a branch, a center point and an inner ring point, the center point is in contact with the measured liquid and forms a current path with the inner ring point in the measured liquid, and the inner ring point is arranged around the center point.

[0006] As a preferred scheme of the liquid level measurement and data collection device, the installation fixing rod is fixedly embedded on the shell and a hole is formed in the center of the shell, and the power supply wire and the motor power supply wire pass through the hole.

[0007] As a preferred scheme of the liquid level measurement and data collection device, the spring coil is made of copper wire and has a certain elasticity and extension amount, and after the contact point part circuit is connected, the spring coil generates a current path and shrinks under the action of a magnetic field, and pulls the shunt upward.

[0008] As a preferred scheme of the liquid level measurement and data collection device, the turning wire wheel is fixedly arranged at the bottom of the shell and is used to change the extension direction of the power supply wire, so that the contact point part vertically sinks to the liquid surface.

[0009] As a preferred scheme of the liquid level measurement and data collection device, the signal collection and control part comprises a power supply module and a signal collection and processing module.

[0010] As a preferred scheme of the liquid level measurement and data collection device, the power supply module adopts a low-voltage direct-current power supply and is used to provide power for the power supply wire and the active wire wheel collector.

[0011] As a preferred scheme of the liquid level measurement and data collection device, the signal collection and processing module is used to collect the current signal of the power supply wire, transmit and use for data analysis and digital-analog conversion.

[0012] As a preferred scheme of the liquid level measurement and data collection device, the signal collection and control part is provided with a power-on circuit time switch, and the power-on current time is used to judge the large-range change of the liquid level.

[0013] As a preferred scheme of the liquid level measurement and data collection device, the center point and the inner ring point are made of conductive materials and are used to generate an electric signal when contacting the liquid surface and transmit the electric signal to the signal collection and control part through the power supply wire, so as to realize real-time detection of the liquid level position.

[0014] A liquid level measurement and data collection method comprises the following steps: S1: the start signal collection and control unit provides power to the motor through the power module, drives the active wire reel to rotate, releases the energized wire, and makes the steering wire reel guide the contact probe to sink vertically to the surface of the measured liquid; S2: when the contact probe contacts the surface of the measured liquid, the center probe and the inner ring probe form a current path under the action of the liquid medium, generate a current signal, and transmit it to the signal collection and control unit through the energized wire; S3: the signal collection and processing module of the signal collection and control unit receives and analyzes the current signal, calculates the travel distance of the contact probe according to the energizing time, and obtains the liquid level height of the measured liquid. At this time, the liquid level height is the liquid level rough data; S4: after the spring coil is energized, an electromagnetic effect is generated, which makes it shrink under the action of the magnetic field, pulls the shunt upward, and synchronously pulls the energized wire and the contact probe upward. When the center probe and the inner ring probe are pulled out of the measured liquid, the original energized circuit is disconnected to form an open circuit. S5: after the open circuit, the spring coil loses the electromagnetic effect and moves downward under the action of the gravity of the contact probe. Thus, it drives the connected components to move downward again, and after entering the measured liquid again, it moves upward again due to the closed circuit. Finally, the contact probe repeatedly moves up and down on the surface layer of the measured liquid. Through the time difference between energizing and disconnecting, the error between the actual liquid level and the liquid level rough data obtained by the active wire reel during the release of the wire can be accurately calculated again. After correction using this data, more accurate liquid level position is obtained, and liquid level information is output. S6: repeat steps S1 to S5 to realize real-time monitoring of the liquid level and continuous collection of data.

[0015] Advantages of the present application: 1. The present application can adapt to the dynamic change measurement of different liquid level heights, and effectively reduce the influence of interference factors such as liquid surface suspended matter and foam through the up-and-down repeated movement mechanism of the contact probe, realize stable and reliable liquid level detection, and is suitable for complex working conditions containing crystalline substances or floating impurities. 2. Compared with the traditional fixed-point liquid level measurement method, the present application can calculate more accurate liquid level data through the closing and opening time and frequency of the current circuit, and improve the measurement accuracy. 3. The present application uses current signal as the core collection medium, and its measurement, collection and digital-to-analog conversion are more convenient than other sound and light signals, which is more conducive to low-cost expansion and application. Moreover, it can be connected to other systems for monitoring and control through digital-to-analog conversion to realize seamless data monitoring and feedback. 4. The present application has good anti-interference ability, can be applied in various equipment and facilities, has good universality and long-term stability, and significantly improves the overall efficiency of industrial process parameter monitoring. BRIEF DESCRIPTION OF DRAWINGS

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the structure of a liquid level measurement and data collection device according to the present invention.

[0017] Figure 2 This is a schematic diagram illustrating the working principle of the liquid level measurement and data collection device of the present invention during startup.

[0018] Figure 3 This is a schematic diagram illustrating the working principle of the liquid level measurement and data collection device of the present invention.

[0019] Figure 4 This is a schematic diagram illustrating the working principle of the liquid level measurement and data collection device of the present invention during stable calculation.

[0020] Figure 5 For the present invention Figure 3 A magnified structural diagram of point A in the middle.

[0021] Figure descriptions: 101, Electromagnetic telescopic part; 101a, Mounting rod; 101b, Iron core; 101c, Spring coil; 101d, Diverter; 102, Wire reel part; 102a, Active wire reel take-up / retractor; 102b, Steering wire reel; 102c, Motor power cable; 103, Contact measuring point part; 103a, Wiring port; 103b, Center measuring point; 103c, Inner ring measuring point; 104, Signal collection and control part; 105, Housing; 106, Power-carrying wire. Detailed Implementation

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0025] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0026] Example 1 Reference Figures 1 to 5 This is the first embodiment of the present invention. This embodiment provides a liquid level measurement and data collection device, which includes: a housing 105, a contact measuring point part 103, a signal collection and control part 104, and an electromagnetic telescopic part 101 and a reel part 102 disposed in the housing 105.

[0027] The electromagnetic telescopic part 101 includes a mounting rod 101a, an iron core 101b, a spring coil 101c, and a splitter 101d. The iron core 101b and the splitter 101d are fixedly installed inside the housing 105, and the spring coil 101c is sleeved on the iron core 101b. The mounting rod 101a is a rigid mounting rod. Its upper part can extend out of the housing 105 of the device under test and be fixed on the outside of the device. Its lower part is connected to the iron core 101b, and its middle part is connected and fixed to the housing 105. The mounting rod 101a has an external channel at its center for leading the power conductor 106 out of the housing 105 of the device under test. The mounting rod 101a can be connected by thread or welding depending on the site conditions. Among them, the iron core 101b is a steel metal cylinder, and its upper part is fixed to the mounting rod 101a. The function of the iron core 101b is to stabilize and strengthen the magnetic field during operation. Among them, the spring coil 101c is a metal coil with a certain elasticity and stretching capacity. The material is preferably an electromagnetic metal, such as steel wire or copper wire. It is connected to the housing 105 and the circuit breaker 101d through an insulating connector. Its function is that when the contact measuring point 103 connects the circuit, the current in the spring coil 101c is generated. Under the action of the current, a magnetic field is generated and the spring coil 101c begins to contract. During the contraction process, the circuit breaker 101d is pulled upward at the same time. The splitter 101d is an insulating component. Its upper part is connected to the spring coil 101c through insulating material, and its lower part is connected to the reel 102. The energized wire is split into two paths in the splitter 101d and then connected to other components. The function of the splitter 101d is to split the energized wire 106 into two paths and drive the reel 102 to move synchronously when the spring coil 101c moves up and down.

[0028] The reel section 102 includes an active reel take-up and take-down device 102a and a deflector reel 102b disposed in the housing 105. The active reel take-up and take-down device 102a is driven to rotate by a motor, and the motor is electrically connected to the signal collection and control unit 104 through the motor power line 102c. Among them, the active reel take-up and release device 102a is a rotating reel driven by a motor. When not in operation, the motor drives the reel to retract the energized wire 106. When in operation, the motor can be used to release the energized wire 106. The active reel take-up and release device 102a is fixedly installed in the housing 105. The motor has a power cord, which, together with the energized wire 106, passes through the hole of the mounting rod 101a. Among them, the steering pulley 102b is a steering fixed pulley, which is connected to the splitter 101d through a connector. Its function is to support the drooping energized wire 106 and limit its movement, and reduce the wear caused by excessive friction when the energized wire 106 moves up and down. At the same time, when the splitter 101d moves up and down, the steering pulley 102b can drive the energized wire 106 below it to move up and down synchronously.

[0029] The contact measuring point 103 includes a wiring port 103a, a center measuring point 103b, and an inner ring measuring point 103c; Among them, the wiring port 103a is a device that separates two wires in the energized conductor 106 and connects them to two conductive paths respectively; Among them, the central measuring point 103b is a conductive exposed point exposed at the center of the contact measuring point. It is in contact with the liquid being measured and forms a current path in the liquid being measured with the inner measuring point 103c. Among them, the inner ring measuring point 103c is a conductive exposed point exposed to the contact measuring point. The inner ring measuring point 103c is arranged around the central measuring point 103b. It is in contact with the liquid being tested and forms a current path with the central measuring point 103b in the liquid being tested. After the entire contact measuring point part is assembled, the overall density can be adjusted through the hollow part of the housing 105 (less than the density of the liquid being tested) to ensure that it will not sink into the liquid being tested.

[0030] The signal collection and control unit 104 includes a power supply module and a signal collection and processing module. The motor power line and the energized wire 106 of the active reel take-up and take-off unit 102a are both connected to the signal collection and control unit 104. The signal collection and processing module controls the power supply of the active reel take-up and take-off unit 102a through the current signal provided by the energized wire 106, and at the same time transmits the current signal of the energized wire 106 for data analysis or digital-to-analog conversion. The power supply module uses a low-voltage DC power supply to provide power to the energized wire 106 and the active reel take-up and take-off unit 102a. The power supply can be rectified and charged using a rechargeable battery or an external power supply.

[0031] Preferably, the housing 105 is made of corrosion-resistant material and has a certain rigidity, used to install and fix the various internal components and to provide them with protection.

[0032] The implementation method of this embodiment is as follows: Before operation, install it in a suitable detection position and ensure that there are no obstacles on the path of the contact measuring point 103 moving up and down. At the same time, check whether the circuit system is unobstructed and without faults. After completing the power supply test, turn on the device. During operation, the power supply first supplies power to the motor of the active reel take-up and take-down device 102a. As the motor drives the reel to rotate, the contact measuring point 103 will descend vertically under its own gravity. When it reaches the liquid surface to be measured, as the center measuring point 103b and the inner ring measuring point 103c both enter the liquid to be measured, a DC current path is completed by closing the measuring point, the liquid to be measured, the spring coil 101c, and the power supply. At the same time, the signal collection and control unit 104 receives the electrical signal that the spring coil 101c has been closed and stops supplying power to the active reel take-up and take-down device 102a. Based on the energizing time, the travel distance of the contact measuring point 103 is calculated to obtain the liquid level height of the liquid to be measured. The liquid level obtained from this data is coarse data. When the spring coil 101c is energized, it generates an electromagnetic effect. Under the electromagnetic action, the spring coil 101c generates a contraction force that causes it to contract. Since the upper part of the spring coil 101c is fixedly connected to the housing 105, the spring coil 101c can only contract upwards. At the same time, it drives the splitter 101d and the steering wheel 102b to move upwards together. This pulls the energized wire 106 and the contact measuring point 103 to move upwards simultaneously. When the center measuring point 103b and the inner ring measuring point 103c are pulled out of the liquid being measured, the original energized circuit is broken, forming an open circuit. After the circuit is broken, the spring coil 101c loses its electromagnetic effect and will move downwards under the gravity of the contact measuring point 103. This will drive the various components connected to it to move downwards again. After re-entering the liquid being measured, it will move upwards again because the circuit is closed. Finally, the contact measuring point 103 will move up and down repeatedly on the surface of the liquid being measured. For a relatively stationary liquid surface, the signal collection and control unit 104 can take advantage of the time difference between energizing and de-energizing when the contact measuring point 103 moves up and down steadily. This allows for a more accurate calculation of the error between the actual liquid level and the coarse liquid level data obtained when the active reel reel 102a releases the line. After correcting with this data, a more accurate liquid surface position is obtained, and the liquid level information is output. When there are crystals, floating foams or other interferences on the liquid surface, the 103 contact measuring point uses its own up-and-down repeated movement to break the interference and obtain a relatively stable liquid surface current signal. After the signal collection and control unit 104 corrects the data, it obtains a more accurate liquid surface position and outputs the liquid level information.

[0033] Example 2 In a second embodiment of the present invention, based on the above embodiments, the signal collection and control unit 104 is provided with an energized circuit time switch, which uses the energized current time to determine the large-range change in liquid level. An example is: When the liquid level rises rapidly, the spring coil 101c reaches its upper limit and can no longer contract. The energizing time will be extended to the set time. Then, the motor of the active reel take-up and release device 102a is started to tighten the energized wire and record the stroke. This drives the contact measuring point 103 to rise. When it rises above the liquid level, the signal collection and control unit 104 receives the current disconnection signal. After a certain set rising stroke (half the compression of the spring coil 101c), the motor of the active reel take-up and release device 102a is turned off, and the liquid level is measured and new liquid level data is given to the outside world. Similarly, if the liquid level drops rapidly, the spring coil 101c will reach its lower limit and cannot extend further. The power-off time will be extended to the set point time. The motor of the active reel take-up and take-off device 102a will be started to release the energized wire 106 and record the stroke, driving the contact measuring point 103 to rise. When it rises above the liquid level, the signal collection and control unit 104 will obtain the current path signal. After a certain descent set stroke (half the compression of the spring coil 101c), the motor of the active reel take-up and take-off device 102a will be turned off, and the liquid level will be measured and new liquid level data will be given to the outside world.

[0034] After obtaining the liquid level data, the device is shut down. When shutting down, the system will supply power to the motor of the active reel take-up and take-down device 102a and tighten the conductive coil before shutting down.

[0035] When the contact measuring point 103 is retracted, its height can be manually controlled. If the measured liquid level reaches this height, the current path will send a signal to the signal collection and control unit 104 to achieve the liquid level alarm function.

[0036] It should be noted that the conductive liquids to which this invention is applicable include, but are not limited to, water and water-based solutions, such as industrial cooling water and washing water; however, it is not applicable to insulating liquids with extremely low or no conductivity, such as mineral oil, insulating oil, pure alcohol, pure acetone, and liquid hydrocarbons.

[0037] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., the size, dimensions, structure, shape, and proportions of various elements), as well as parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, the use of materials, colors, orientations, etc.), without substantially departing from the novel teachings and advantages of the subject matter described in this application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise changed, and the nature or number or position of discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0038] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A device for measuring and collecting liquid level data, characterized in that, include: The housing (105), the contact measuring point (103), the signal collection and control unit (104), and the electromagnetic telescopic part (101) and the reel part (102) disposed in the housing (105) are provided. The contact measuring point (103) is electrically connected to the signal collection and control unit (104) through a energized wire (106). The electromagnetic telescopic part (101) includes a mounting rod (101a), an iron core (101b), a spring coil (101c), and a splitter (101d). The upper part of the iron core (101b) is fixed to the mounting rod (101a). The upper part of the splitter (101d) is connected to the spring coil (101c) through insulating material, and the lower part is connected to the reel part (102). The upper end of the spring coil (101c) is fixedly connected to the housing (105). The spool section (102) includes an active spool take-up and take-down device (102a) and a steering spool (102b). The active spool take-up and take-down device (102a) is fixedly installed inside the housing (105), and the active spool take-up and take-down device (102a) is driven to rotate by a motor. The motor is electrically connected to the signal collection and control unit (104) through a motor power line (102c). The steering spool (102b) is connected to the splitter (101d) through a connector. The contact measuring point (103) includes a wiring port (103a), a center measuring point (103b), and an inner ring measuring point (103c). The center measuring point (103b) is in contact with the liquid being measured and forms a current path in the liquid being measured with the inner ring measuring point (103c). The inner ring measuring point (103c) is arranged around the center measuring point (103b).

2. The apparatus for liquid level measurement and data collection according to claim 1, characterized in that: The mounting rod (101a) is fixedly embedded in the housing (105) and has an external hole at its center. The power conductor (106) and the motor power line (102c) pass through the hole.

3. The apparatus for liquid level measurement and data collection according to claim 1, characterized in that: The spring coil (101c) is made of copper wire and has a certain elasticity and stretching capacity. After the circuit of the contact measuring point (103) is connected, the spring coil (101c) generates a current path and contracts under the action of the magnetic field, while pulling the shunt (101d) upward.

4. The apparatus for liquid level measurement and data collection according to claim 1, characterized in that: The steering wheel (102b) is fixedly installed at the bottom of the housing (105) to change the extension direction of the energized wire (106) so that the contact measuring point (103) sinks vertically to the liquid surface.

5. The apparatus for liquid level measurement and data collection according to claim 1, characterized in that: The signal collection and control unit (104) includes a power supply module and a signal collection and processing module.

6. The apparatus for liquid level measurement and data collection according to claim 5, characterized in that: The power module uses a low-voltage DC power supply to provide power to the energized conductor (106) and the active reel take-up / retractor (102a).

7. The apparatus for liquid level measurement and data collection according to claim 5, characterized in that: The signal collection and processing module is used to collect the current signal of the energized conductor (106), transmit it out and use it for data analysis and digital-to-analog conversion.

8. The apparatus for liquid level measurement and data collection according to claim 1, characterized in that: The signal collection and control unit (104) is equipped with an energized circuit time switch, which uses the energized current time to determine the large range of liquid level changes.

9. The apparatus for liquid level measurement and data collection according to claim 1, characterized in that: The central measuring point (103b) and the inner ring measuring point (103c) are made of conductive material and are used to generate electrical signals when in contact with the liquid surface and transmit them to the signal collection and control unit (104) through the energized wire (106) to realize real-time detection of liquid level position.

10. A method for measuring and collecting liquid level data, employing the apparatus for measuring and collecting liquid level data according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1: Start the signal collection and control unit (104), provide power to the motor through the power module, drive the active reel take-up and take-down device (102a) to rotate, release the energized wire (106), and cause the guide reel (102b) to guide the contact measuring point (103) to sink vertically to the surface of the liquid being measured; S2: When the contact measuring point (103) contacts the surface of the liquid being measured, the central measuring point (103b) and the inner ring measuring point (103c) form a current path under the action of the liquid medium, generating a current signal and transmitting it to the signal collection and control unit (104) through the energized wire (106). S3: The signal collection and processing module of the signal collection and control unit (104) receives and analyzes the current signal, calculates the travel distance of the contact measuring point (103) based on the energizing time, and obtains the liquid level height of the liquid being measured. At this time, the liquid level height is the coarse liquid level data. S4: When the spring coil (101c) is energized, it generates an electromagnetic effect, causing it to contract under the action of a magnetic field, pulling the shunt (101d) upward, and simultaneously pulling the energized wire (106) and the contact measuring point (103) upward. When the center measuring point (103b) and the inner ring measuring point (103c) are pulled out of the liquid being measured, the original energized circuit is broken, forming an open circuit. S5: After the circuit is broken, the spring coil (101c) loses its electromagnetic effect and moves downward under the gravity of the contact measuring point (103). This causes the connected components to move downward again and then move upward again after entering the liquid being measured due to the closed circuit. Finally, the contact measuring point (103) will move up and down repeatedly on the surface of the liquid being measured. By taking advantage of the time difference between energizing and disconnecting, the error between the actual liquid level and the coarse liquid level data obtained when the active reel reel (102a) releases the line can be accurately calculated again. After correcting with this data, a more accurate liquid level position is obtained and the liquid level information is output. S6: Repeat steps S1 to S5 to achieve real-time liquid level monitoring and continuous data collection.

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