A liquid level gauge, a method of calibrating a liquid level gauge and a program product

Abstract

The application discloses a liquid level meter, a calibration method, device and program product thereof. The liquid level meter comprises a connecting line, a positioning device, a guide device and a winding device. The connecting line is in a flat strip structure. The first end of the connecting line is wound on the winding device. The second end of the connecting line is hung on the positioning device. The connecting line passes through the guide device. The wide surface of the connecting line is limitedly attached to the guide device. Under the guidance of the guide device, the winding device releases the connecting line so that the positioning device reaches the liquid surface. The released length of the connecting line is used to indicate the liquid level of the liquid surface. In this way, the flat strip structure and the guidance and limitation of the guide device make the connecting line have high torsional stiffness, eliminate the self-rotation, kinking and winding problems of the traditional thin line structure, and improve the accuracy. In addition, the flat strip structure increases the effective bearing cross-sectional area, avoids mechanical extension over time, and improves the measurement accuracy and long-term stability of the liquid level meter.

Description

Technical Field

[0001] This application relates to the field of metrology, and in particular to a level gauge, a calibration method for the level gauge, and a procedure product. Background Technology

[0002] A level gauge is a measuring instrument used to measure the position of the liquid surface inside a container. It is widely used in various industrial scenarios such as chemical manufacturing, water treatment, and energy storage to collect physical parameters such as liquid level height.

[0003] During liquid level measurement, the connecting wire in the liquid level gauge is continuously released, causing the positioning device suspended at one end of the wire to move down to approach the liquid surface. When the positioning device touches the liquid surface, the specific location of the liquid level can be determined by the length of the released connecting wire.

[0004] However, the aforementioned connecting wires are usually made of steel wire rope, which can easily lead to problems such as wire tangling and decreased measurement accuracy over time in practical applications, which urgently need to be addressed. Summary of the Invention

[0005] This application provides a level gauge and a corresponding calibration method for the level gauge to improve the calibration accuracy of the level gauge. Furthermore, this application also provides corresponding apparatus, devices, computer-readable storage media, and computer program products.

[0006] In a first aspect, embodiments of this application provide a level gauge, which includes a connecting wire, a positioning device, a guiding device, and a winding device. The connecting wire has a flat strip structure, with its first end wound around the winding device and its second end suspended from the positioning device. The connecting wire passes through the guiding device, and its wide surface is in contact with the guiding device. Under the guidance of the guiding device, the winding device releases the connecting wire so that when the positioning device reaches the liquid surface, the released length of the connecting wire is used to indicate the liquid level.

[0007] In one possible implementation, the level gauge further includes a limiting device, which includes a limiting gap for the connecting wire to pass through, the maximum dimension supported by the limiting gap being smaller than the dimension of the positioning device; during the winding process of the connecting wire being retracted by the winding device, when the positioning device abuts against the limiting device, the limiting device is used to stop the positioning device to limit the zero point position of the positioning device, and the first actual release length of the connecting wire when the positioning device is at the zero point position is the measurement zero point.

[0008] In one possible implementation, the level gauge further includes a force sensor for measuring tension on the connecting line to determine whether the positioning device abuts against the limiting device; and / or, the limiting device includes a micro switch for determining whether the positioning device abuts against the limiting device.

[0009] In one possible implementation, the level gauge further includes a first encoder connected to a winding device, the first encoder measuring the rotation of the winding device to determine the release length of the connecting wire; and / or, the level gauge further includes a second encoder and a timing pulley, the wide surface of the connecting wire having a plurality of positioning holes spaced apart along the winding direction, the outer circumferential surface of the timing pulley having meshing protrusions adapted to the plurality of positioning holes, the connecting wire winding around the timing pulley and meshing with the timing pulley, the second encoder connected to the timing pulley measuring the rotation of the timing pulley to determine the release length of the connecting wire.

[0010] In one possible implementation, the level gauge includes a second encoder and a synchronizing wheel, and the level gauge also includes a clamping device for clamping the connecting wire to the outer peripheral surface of the synchronizing wheel for engagement.

[0011] Secondly, embodiments of this application provide a calibration method for a level gauge. The level gauge includes a connecting wire, a positioning device, a winding device, and a limiting device. A first end of the connecting wire is wound around the winding device, and a second end of the connecting wire is suspended from the positioning device. The winding device releases the connecting wire so that when the positioning device reaches the liquid surface, the release length of the connecting wire is used to indicate the liquid level. The limiting device includes a limiting gap through which the connecting wire passes, and the maximum dimension supported by the limiting gap is smaller than the dimension of the positioning device. The method includes: controlling the winding device to retract the connecting wire; during the process of the winding device retracting the connecting wire, when the positioning device abuts against the limiting device, determining that the positioning device is at a zero position under the stopping action of the limiting device; when the positioning device is at the zero position, determining a first actual release length of the connecting wire; and calibrating the first actual release length of the connecting wire as the measurement zero point.

[0012] In one possible implementation, after calibrating the actual release length of the connecting wire to the metering zero point, the method further includes: determining a second actual release length of the connecting wire when the winding device releases the connecting wire so that the positioning device reaches the liquid surface; and determining the liquid level based on the second actual release length, the first actual release length, and the reference release length of the connecting wire when the positioning device is initially in the zero point position.

[0013] In one possible implementation, after determining the first actual release length of the connecting wire, the method further includes: controlling the winding device to release the connecting wire so that the positioning device does not abut against the limiting device.

[0014] In one possible implementation, the method further includes reporting fault information if the difference between the first actual release length and the reference release length does not meet the safe range.

[0015] Thirdly, this application also provides a calibration device for a level gauge, the device comprising: a control module for controlling a winding device to retract a connecting wire; a determination module for determining that, during the winding process, when a positioning device abuts against a limiting device, the positioning device is at a zero position under the stop action of the limiting device; and determining a first actual release length of the connecting wire when the positioning device is at a zero position; and a calibration module for calibrating the first actual release length of the connecting wire to a measurement zero point.

[0016] In one possible implementation, after the calibration module calibrates the actual release length of the connecting wire to the metering zero point, the determining module is further configured to determine the second actual release length of the connecting wire when the winding device releases the connecting wire so that the positioning device reaches the liquid surface; and determine the liquid level based on the second actual release length, the first actual release length, and the reference release length of the connecting wire when the positioning device is initially in the zero point position.

[0017] In one possible implementation, after the determining module determines the first actual release length of the connecting line, the control module is also used to control the winding device to release the connecting line so that the positioning device does not abut against the limiting device.

[0018] In one possible implementation, the device further includes a reporting module for reporting fault information when the difference between the first actual release length and the reference release length does not meet the safe range.

[0019] Fourthly, embodiments of this application also provide a computing device, which may include a processor and a memory: the memory is used to store a computer program; the processor is used to execute the method described in the second aspect and any one of the embodiments in the second aspect according to the computer program.

[0020] Fifthly, embodiments of this application also provide a computer-readable storage medium for storing a computer program for performing the methods described in the second aspect and any one of the embodiments in the second aspect.

[0021] In a sixth aspect, embodiments of this application also provide a computer program product including instructions that, when run on a computing device, cause the computing device to perform the methods described in the second aspect and any one of the embodiments of the second aspect.

[0022] In the above implementation of this application embodiment, by using a flat, strip-shaped connecting line and combining it with a guiding device to ensure that the wide surface of the connecting line fits snugly against the guiding device, significant beneficial effects are achieved. On the one hand, the flat, strip-shaped structure combined with the guiding and limiting function of the guiding device gives the connecting line extremely high torsional stiffness, effectively eliminating the spin, kinking, and entanglement problems that are prone to occur in traditional thin-line structures. This not only ensures that the descent trajectory of the positioning device is controllable but also ensures that the connecting line can be wound smoothly and evenly on the winding device in a regular manner, avoiding abnormal winding radius caused by tangled wires, thereby effectively improving the accuracy of determining the liquid level based on the release length. On the other hand, the flat, strip-shaped structure increases the effective load-bearing cross-sectional area of ​​the connecting line, dispersing axial tensile stress, allowing the connecting line to maintain stable length properties under long-term suspended stress, avoiding liquid level measurement deviations caused by mechanical elongation over time, and significantly improving the measurement accuracy and long-term stability of the liquid level gauge. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0024] Figure 1 This is a schematic diagram of the architecture of a data processing system according to an embodiment of this application;

[0025] Figures 2a to 2d This is a schematic diagram of the architecture of several level gauges in the embodiments of this application;

[0026] Figure 3 This is a flowchart illustrating a calibration method for a level gauge according to an embodiment of this application.

[0027] Figure 4 This is a schematic diagram of the structure of a calibration device for a level gauge according to an embodiment of this application;

[0028] Figure 5 This is a schematic diagram of the hardware structure of a computing device according to an embodiment of this application. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, various non-limiting embodiments of the present application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0030] See Figure 1 This is a schematic diagram of a data processing system provided in this application. Figure 1 As shown, the data processing system 10 includes a processor 100 and a memory 200.

[0031] The processor 100 refers to a device with data processing and control capabilities. For example, the processor 100 may be a central processing unit (CPU), a graphics processing unit (GPU), or an application-specific integrated circuit (ASIC), etc., and there is no limitation on this.

[0032] The memory 200 refers to a device with data and file storage capabilities, such as semiconductor memory, magnetic memory, random access memory (RAM), or read-only memory (ROM), etc., without limitation. Furthermore, the memory 200 may store databases or instruction codes for data management, data retrieval, and to support processor operations.

[0033] The processor 100 and the memory 200 can be connected via a bus, such as a peripheral component interconnect express (PCIe) bus. Alternatively, the processor 100 and the memory 200 can be connected via a network, such as a local area network (LAN) or a wide area network (WAN), and in terms of connection method, such as a wired network or a wireless network.

[0034] Understandable Figure 1 The architecture of the data processing system 10 shown is merely an example provided in this application embodiment and does not limit the number, connection method, etc. For example, the data processing system 10 may also include a greater number of processors or memories.

[0035] exist Figure 1 In this system, the data processing system 10 is connected to the level gauge 30 to control the level gauge 30 and process related data. Below, we will first refer to the attached... Figure 2a The level gauge 30 is described by way of example.

[0036] In the appendix Figure 2a In this design, the level gauge 30 is deployed in the upper region of a container structure containing the liquid to be measured, and is used to obtain the vertical height parameter of the interface between two phases (i.e., the liquid level) inside the container. The liquid level can refer to either a gas-liquid interface or an interface between different liquids, such as an oil-water interface; there is no limitation on this.

[0037] The level gauge 30 may include a winding device 301, a connecting line 302, and a positioning device 303.

[0038] The winding device 301 refers to a device capable of receiving, winding, and releasing flexible cables. The winding device 301 can be, for example, a drum. For instance, a drum is a cylindrical mechanical rotating body on which the connecting cable 302 is physically secured and wound, thereby enabling the release or retraction of the connecting cable 302 by rotating the drum.

[0039] Here, connecting wire 302 refers to a flexible transmission device with certain axial tensile strength and low physical elongation. For example, connecting wire 302 can be a steel wire rope, braided fiber rope, or cable.

[0040] The positioning device 303 refers to a mechanical detection device with a certain counterweight used to sense the liquid level. For example, the positioning device 303 can be a float or a counterweight with a regular shape. It is understood that the positioning device 303 usually has a certain weight to ensure that it can tighten the connecting line 302 in the suspended state, overcoming the inherent bending stress of the connecting line 302 itself and the horizontal drift caused by crosswinds, gas or liquid disturbances inside the container.

[0041] Optional, Figure 2a The level gauge 30 shown may also include a servo motor 305 (not shown in the figure), which can be a servo level gauge. The servo motor 305 refers to a device capable of power-driven control of a mechanical system. For example, the servo motor 305 can receive control signals to output stable and continuous rotational kinetic energy.

[0042] Optional, Figure 2a The level gauge 30 shown may also include an encoder 319 (not shown in the figure). The encoder 319 is a device capable of measuring the rotation angle of a mechanical rotating component. For example, the encoder 319 may be an incremental photoelectric rotary encoder, an absolute photoelectric encoder, or a magnetic encoder.

[0043] Optional, Figure 2aThe level gauge 30 shown may also include a force sensor 3010 (not shown in the figure). The force sensor 3010 refers to a device capable of converting physical forces into a measurable electrical signal output. For example, the force sensor 3010 may be a load cell, a piezoelectric tension sensor, or a piezoelectric force sensor. It is understood that the sensing element of the force sensor 3010 can capture force fluctuations, and through its internally integrated measurement circuitry, this mechanical force signal is converted into an electrical signal to characterize the real-time force value on the monitored mechanical component.

[0044] The connection relationship of each component in the level gauge 30 is described below as an example.

[0045] First, for clarity, the two ends of the connecting wire 302 are referred to as the first end and the second end, respectively. The first end of the connecting wire 302 is wound around the aforementioned winding device 301, which is, for example, a drum. The first end of the connecting wire 302 can be securely wound around the cylindrical outer surface of the drum. The second end of the connecting wire 302 hangs naturally in the internal space of the container under the influence of gravity. This second end is suspended and connected to the aforementioned positioning device 303, causing the positioning device 303 to experience a vertical upward pulling force from the connecting wire 302.

[0046] Optionally, the servo motor 305 is connected to the winding device 301. For example, the power output shaft of the servo motor 305 can be mechanically linked to the central spindle of the winding device 301 through a rigid coupling, a gear reducer, or a synchronous belt drive mechanism to drive the winding device 301 to rotate.

[0047] Optionally, the encoder 319 is connected to the winding device 301. For example, the detection shaft of the encoder 319 is directly coaxially connected to the central spindle of the winding device 301. The encoder 319 can measure the rotation (total rotation angle) of the winding device 301 during operation to determine the winding and unwinding length of the connecting line 302. It is understood that since the connecting line 302 is wound around the winding device 301, the linear displacement of the winding device 301 during rotation is the winding and unwinding length of the connecting line 302, which is also the displacement of the positioning device 303. For example, based on the outer diameter of the winding device 301, the winding circumference of the winding device 301 can be determined, which is the linear displacement of a single turn of the winding device 301. Further, by performing geometric conversion on the aforementioned rotation and winding circumference, the winding and unwinding length of the connecting line 302 can be determined.

[0048] Below, using the exemplary structure of the liquid level gauge 30 described above as an example, the liquid level measurement process of the data processing system 10 will be introduced. The liquid level measurement process described below is primarily based on the mechanical sensor 3010, and this application does not limit the sensing method.

[0049] Before the data processing system 10 performs the liquid level measurement task, the release length of the connecting line 302 is maintained at the measurement zero point. At this time, the positioning device 303 is suspended at the initial position on the top of the container, which is in the gas phase space (air). At this time, the tension parameter continuously acquired by the force sensor 3010 presents a stable reference value, which is equal to the absolute scalar sum of the weight of the connecting line 302 suspended in the air and the weight of the positioning device 303 itself.

[0050] After the liquid level measurement task begins, the data processing system 10 controls the winding device 301 to rotate at a constant speed to release the connecting line 302, so that the positioning device 303, under the traction of gravity, moves at a constant physical speed from its initial position towards the lower liquid surface. This process can be driven by the servo motor 305 based on the control commands of the data processing system 10. During the descent of the positioning device 303, the encoder 319 can update the rotation of the winding device 301 in real time and dynamically determine the current release length of the connecting line 302. At the same time, the force sensor 3010 continuously measures the tension parameter on the connecting line 302 in real time. During the descent phase when the positioning device 303 is completely in the gas medium and is basically in uniform linear motion (without acceleration), the tension parameter is basically maintained near the aforementioned reference value.

[0051] As the connecting line 302 continues to release, the tension value acquired by the force sensor 3010 changes when the positioning device 303 touches and gradually submerges into the internal space of the liquid. According to Archimedes' principle, the volume of liquid displaced by the positioning device 303 will generate a vertically upward buoyant force on it. The direction of this buoyant force is opposite to the direction of gravity of the positioning device 303, causing the downward pull exerted by the positioning device 303 on the connecting line 302 to decrease after the buoyant force acts on the positioning device 303. The force sensor 3010 senses this dynamic force change in real time, thereby instructing the data processing system 10 that the positioning device 303 has reached the liquid surface. This dynamic tension change can be, for example, when the difference between the real-time tension value measured by the force sensor 3010 and the aforementioned reference value is greater than a tension threshold. This tension threshold can be obtained, for example, through multiple tests in a laboratory environment based on the same scenario (same liquid medium, etc.) and stored in the memory 200 of the data processing system 10.

[0052] After the data processing system 10 determines that the positioning device 303 has reached the liquid surface, the data processing system 10 can control the winding device 301 to stop rotating. The data processing system 10 can obtain the release length of the connecting line 302, which can be determined, for example, based on the encoder 319. It is understood that the release length of the connecting line 302 can be used to characterize the liquid level value. This liquid level value can, for example, be equal to the release length of the connecting line 302, that is, the distance between the liquid surface and the initial metering zero point; or, the liquid level value can, for example, be the vertical height between the liquid surface and the bottom of the container. The data processing system 10 can determine the value of this vertical height based on the vertical distance from the metering zero point to the bottom plate of the container, combined with the release length.

[0053] Optionally, after determining the liquid level value, the data processing system 10 can control the winding device 301 to reverse and retract the connecting line 302, so that the positioning device 303 returns to its initial position hovering at the top of the container, thereby completing a complete liquid level measurement process.

[0054] It should be noted that the above exemplary implementation process is used to illustrate the determination of the liquid level at the gas-liquid interface. In practical applications, a similar method can be used to determine the interface position of different liquids.

[0055] However, the above-mentioned liquid level measurement method may have problems.

[0056] In practical applications, the aforementioned connecting line 302 typically employs a thin steel wire rope structure. Due to the radial symmetry of the thin steel wire rope and the lack of structural torsional restraint, it is highly prone to self-spinning during natural descent. Especially when the winding device 301 frequently performs winding and unwinding operations, the residual stress inside the steel wire rope may be released, leading to kinking or tangling of the connecting line 302 itself. Understandably, once the connecting line 302 becomes tangled, it will not only hinder the smooth lifting and lowering of the positioning device 303, causing the descent trajectory of the positioning device 303 inside the container to deviate from the vertical direction, but it will also cause irregular overlap and tangled strands when the connecting line 302 is wound on the winding device 301. This irregular winding will change the actual winding outer diameter of the winding device 301, resulting in a significant nonlinear deviation between the release length calculated based on the rotation of the winding device 301 and the actual release length, thus severely affecting the accuracy of liquid level measurement.

[0057] In addition, due to its thin shape and small cross-sectional area, the connecting wire 302 needs to continuously withstand the axial tensile stress generated by the weight of the positioning device 303 during the long-term operation of the level gauge 30. Because of its small cross-sectional area, this tensile stress is often at a high level inside the thin wire rope, easily leading to unavoidable mechanical elongation of the material. Especially under prolonged gravity loads and alternating environmental temperature cycles, this connecting wire 302, based on a thin linear structure, will exhibit significant plastic deformation and creep elongation. It should be noted that this irreversible elongation accumulated over time will directly disrupt the initial length calibration of the connecting wire 302. This will inevitably lead to a systematic deviation in the liquid level determined based on the release length of the connecting wire 302, reducing the reliability and long-term measurement stability of the level gauge 30.

[0058] Therefore, in order to solve the above problems, this application provides an improved level gauge 30, in... Figure 2a Based on the level gauge 30 shown, the structure of the connecting line 302 and related transmission components are redesigned to overcome the entanglement and extension defects caused by the thin connecting line.

[0059] Specifically, see Figure 2b As shown, the connecting line 302 in this embodiment has a flat strip structure. This is similar to the structure described above. Figure 2a Similar to the description, the first end of the connecting line 302 is wound around the surface of the winding device 301, and the second end of the connecting line 302 is suspended and connected to the positioning device 303.

[0060] In addition, on the mechanical transmission path of the connecting line 302 extending from the winding device 301 to the positioning device 303, the connecting line 302 passes around the guide device 304, and the wide surface of the connecting line 302 maintains a limited fit with the surface of the guide device 304.

[0061] The aforementioned flat strip structure refers to the connecting wire 302 having a significant difference in width and thickness in its cross-section; that is, its width is much greater than its thickness. This means that, compared to traditional thin steel wire ropes with a circular cross-section, this flat strip structure gives the connecting wire 302 extremely high torsional resistance when twisted around its longitudinal axis. In other words, the flat strip structure inherently possesses strong torsional resistance, effectively suppressing the self-spinning of the connecting wire 302 in a suspended state, fundamentally avoiding the problems of kinking or tangling of the connecting wire 302 and the resulting decrease in accuracy. Furthermore, by increasing the width of the cross-section, this flat strip structure significantly increases the overall cross-sectional area of ​​the connecting wire 302 without significantly increasing the thickness to maintain its good bending flexibility. This structural feature significantly reduces the tensile stress level generated inside the connecting line 302 by the gravity of the positioning device 303, thereby enabling the connecting line 302 to withstand greater load-bearing capacity and greatly reducing mechanical elongation over time, ensuring long-term stability in the length dimension and effectively avoiding the problem of decreased accuracy.

[0062] For example, the flat, ribbon-like connecting wire 302 can be a flat webbing made of high-strength polymer fibers or other materials. Alternatively, the connecting wire 302 can be a flat cable structure. For instance, the core of the connecting wire 302 can be made of metals such as copper or steel to provide axial mechanical strength. Furthermore, the outer sheath of the connecting wire 302 can be made of materials with corrosion resistance and high-temperature resistance, including polyetheretherketone (PEEK) or polytetrafluoroethylene (PTFE), to adapt to different container internal environments.

[0063] Optionally, the connecting line 302 may contain a built-in conductor. This conductor can extend along the axial direction of the connecting line 302 to establish an electrical signal path between the data processing system 10 and the positioning device 303. It is understood that through this electrical signal path, real-time measurement data at the positioning device 303 can be collected, or bidirectional signal transmission between the data processing system 10 and the positioning device 303 can be achieved. Alternatively, the data information collected by the positioning device 303 can be transmitted to the data processing system 10 through a wireless communication component in the positioning device 303; this is not limited.

[0064] Optionally, the positioning device 303 may further include multiple sensors, or it may integrate a multifunctional sensor capable of measuring various physical parameters. For example, the multiple sensors may include a temperature sensor for measuring the temperature of the medium and a density sensor for measuring the density of the medium. For instance, during the process of the positioning device 303 immersing itself in a liquid or moving within the container, the multiple sensors in the positioning device 303 can dynamically acquire multi-dimensional data such as temperature and density parameters at its current location, and transmit this multi-dimensional data to the data processing system 10 via the wires built into the connecting line 302, so that the processor 100 can determine the physical characteristics of the medium inside the container.

[0065] The aforementioned guiding device 304 refers to a mechanical device capable of changing the direction of movement of the flexible transmission component and constraining its position. For example, the guiding device 304 can be a guide wheel or a guide pin. In this embodiment, the guiding device 304 is described as a guide wheel. The guide wheel can rotate freely around its central axis, and its outer circumferential surface forms a guiding surface that physically contacts the connecting line 302. After being released by the winding device 301, the connecting line 302 passes through the guiding surface of the guiding device 304 and then extends vertically downward to the positioning device 303 inside the container.

[0066] It should be noted that the aforementioned contact between the wide surface of the connecting line 302 and the guide device 304 means that the wider surface of the flat, strip-shaped connecting line 302 is directly laid flat and tightly adhered to the guide surface of the guide device 304. Through this surface contact and adherence between the wide surface and the guide device 304, the guide device 304 provides a clear geometric constraint plane for the connecting line 302. This contact method ensures that the connecting line 302 can only bend along its thickness direction when passing through the guide device 304, further strengthening the restriction on the torsional freedom of the connecting line 302, ensuring that the connecting line 302 always remains on the preset transmission trajectory, and preventing the connecting line 302 from deviating during the retraction and extension process.

[0067] For example, taking the data processing system 10 performing a liquid level measurement task based on the mechanical sensor 3010 as an example, under the guidance of the aforementioned guiding device 304, the winding device 301 releases the connecting line 302, which has a flat, ribbon-like structure. During the release of the connecting line 302, the positioning device 303 moves downward due to gravity. When the positioning device 303 touches and gradually submerges into the liquid surface, the mechanical sensor 3010 senses the tension change caused by buoyancy and converts it into an electrical signal. Based on this, the data processing system 10 determines that the positioning device 303 has reached the liquid surface and controls the winding device 301 to stop the release action. At this time, the data processing system 10 obtains the release length of the connecting line 302, which can be used to accurately indicate the liquid level in the container.

[0068] Thus, by employing a flat, ribbon-like connecting line 302 and combining it with a guide device 304 to ensure the wide surface of the connecting line 302 fits snugly against the guide device 304, significant benefits are achieved. Firstly, the flat, ribbon-like structure combined with the guiding and limiting function of the guide device 304 gives the connecting line 302 extremely high torsional stiffness, effectively eliminating the spin, kinking, and entanglement problems easily caused by traditional thin-wire structures. This not only ensures the controllable descent trajectory of the positioning device 303 but also ensures that the connecting line 302 can be wound smoothly and evenly on the winding device 301 in a regular manner, avoiding abnormal winding radius caused by tangled wires, thereby effectively improving the accuracy of determining the liquid level based on the release length. Secondly, the flat, ribbon-like structure increases the effective load-bearing cross-sectional area of ​​the connecting line 302, dispersing axial tensile stress. This allows the connecting line 302 to maintain stable length properties under long-term suspended stress, avoiding liquid level measurement deviations caused by mechanical elongation over time, and significantly improving the measurement accuracy and long-term stability of the level gauge 30.

[0069] Based on the above Figure 2a The description illustrates an implementation method for determining the release length of the connecting wire based on the encoder 319 connected to the winding device 301. This implementation method can also be applied to... Figure 2b The structure of the liquid level gauge 30 shown will not be described in detail here.

[0070] In addition to the encoder 319 connected to the winding device 301 above determining the release length of the connecting wire, the level gauge 30 can also be based on other implementation methods, or exist simultaneously with the implementation methods described below.

[0071] As one implementation, the level gauge 30 also includes an encoder 329 and a timing pulley 307.

[0072] The synchronous pulley 307 refers to a mechanical rotating device that transmits motion or power through the interrelationship between structures. For example, the synchronous pulley 307 can be a convex synchronous pulley, a pin-tooth drive pulley, or a specially designed pulley. The synchronous pulley 307 has specific external geometric features and can convert the linear translational displacement of the connecting line 302 into its own rotational angular displacement with high precision.

[0073] Encoder 329 is similar to encoder 319 mentioned above, and will not be described in detail here.

[0074] In terms of mechanical connection, encoder 329 is connected to synchronous pulley 307. For example, the detection shaft of encoder 329 can be directly and coaxially fastened to the central rotating shaft of synchronous pulley 307. Encoder 329 is used to measure the amount of rotation of synchronous pulley 307 during operation, so that data processing system 10 can determine the release length of connection line 302 based on the real-time rotation amount.

[0075] The following is in conjunction with the appendix Figure 2c The mechanical fit and transmission logic between the connecting line 302 and the aforementioned synchronous pulley 307 are described exemplarily. The synchronous pulley 307 can be a convex synchronous pulley. For example... Figure 2c As shown, the wide surface of the connecting line 302 is provided with multiple positioning holes spaced apart along the extension / retraction direction. Specifically, the connecting line 302 has a flat, strip-like structure, and on its wide surface, along the longitudinal axis of the connecting line 302 (i.e., the physical extension / retraction direction during the liquid level measurement process), a series of geometrically regular through-hole or blind-hole positioning holes are formed. Correspondingly, the outer circumferential surface of the synchronous pulley 307 is provided with meshing protrusions that are adapted to the multiple positioning holes. This outer circumferential surface is the cylindrical working surface of the synchronous pulley 307, and on this cylindrical working surface, multiple outwardly radially protruding solid mechanical structures, namely the aforementioned meshing protrusions, are evenly distributed along the circumferential direction. It should be noted that the circumferential arc length pitch of the aforementioned meshing protrusions matches the linear pitch of the positioning holes on the connecting line 302 numerically, so that they are precisely coupled. Based on this, the connecting line 302 wraps around the synchronous pulley 307, and the connecting line 302 meshes with the synchronous pulley 307 for transmission. This allows the downward movement of the connecting line 302 to be transmitted to the synchronous pulley 307 through its interaction with the synchronous pulley 307. Consequently, the encoder 329 connected to the synchronous pulley 307 can measure the release length of the connecting line 302. It can be understood that under the action of meshing transmission, the linear displacement of the connecting line 302 is the same as the length of the arc trajectory traversed by the meshing protrusion on the outer circumference of the synchronous pulley 307.

[0076] Understandably, the above implementation method, through the interference relationship between the positioning hole and the engaging protrusion, avoids the possibility of relative slippage between the connecting line 302 and the synchronous pulley 307 from the perspective of physical transmission principle, ensuring a low slip rate in kinematic displacement transmission and effectively improving the absolute accuracy of the raw data for release length detection. Secondly, in current practical applications, if the release length is calculated solely based on the rotation of the winding device 301, the actual winding radius of the winding device 301 will dynamically change due to the possible multi-layer superposition and winding of the connecting line 302 on the surface of the winding device 301, resulting in measurement errors. The measurement method based on the synchronous pulley 307 provided in this application can effectively alleviate the above error problems, making the release length accuracy of the connecting line 302 higher and the liquid level measurement more accurate.

[0077] Optionally, further, based on the release length measurement performed in cooperation with the encoder 329 and the synchronizer 307 described above, the level gauge 30 also includes a clamping device 308. Specifically, the clamping device 308 is deployed in the adjacent space of the synchronizer 307, and is used to firmly clamp the wide surface of the connecting line 302 onto the outer peripheral surface of the synchronizer 307 to ensure that the positioning hole and the engagement protrusion maintain a reliable mechanical engagement state under any operating conditions.

[0078] The aforementioned clamping device 308 refers to a mechanical component capable of applying a continuous normal force to a flexible cable in motion. For example, the clamping device 308 may be a floating pressure roller mechanism.

[0079] In actual assembly and operation, the connecting wire 302 can, for example, pass through the transmission gap formed between the synchronous pulley 307 and the clamping device 308 (e.g. Figure 2b As shown, the cylindrical smooth outer circumferential surface of the clamping device 308 directly contacts the connecting line 302. Under elastic force, the clamping device 308 can apply continuous and constant positive physical pressure to the connecting line 302, forcing the connecting line 302 to engage with the meshing protrusion of the synchronous pulley 307.

[0080] Understandably, when the positioning device 303 just touches the surface of a high-density liquid, causing a sudden change in the tension of the connecting wire, or under complex conditions such as airflow disturbances or mechanical equipment vibrations inside the container, the connecting wire 302 is prone to longitudinal slack or lateral vibration. The constant normal force provided by the clamping device 308 acts as mechanical damping, preventing the connecting wire 302 from bouncing radially and partially detaching from the outer circumference of the synchronous pulley 307. This fundamentally eliminates the occurrence of skipped or dislodged teeth from the physical structure, ensuring the absolute continuity of the transmission relationship between the positioning hole and the meshing protrusion, and guaranteeing the uninterrupted and accurate measurement data under harsh conditions.

[0081] Furthermore, in order to further improve the measurement accuracy over a long period of time and eliminate the systematic accumulated errors caused by changes in ambient temperature and long-term stress, the level gauge 30 also includes a limiting device 306.

[0082] Combined with appendix Figure 2d As shown, the limiting device 306 refers to a rigid mechanical structure disposed below the level gauge 30 for physically constraining the extreme spatial position of the moving component. The limiting device 306 may, for example, include a limiting gap 306a through which the connecting line 302 passes.

[0083] The limiting gap 306a can be a central through-hole or a lateral opening slot penetrating the body of the limiting device 306. It should be noted that the maximum physical dimension supported by the limiting gap 306a is smaller than the external contour dimension of the positioning device 303. During the operation of the winding device 301 to retract the connecting line 302, due to the geometric interference of physical dimensions, when the positioning device 303 is pulled upwards to the area of ​​the limiting device 306, its upper end face will abut against the lower surface of the limiting device 306. The limiting device 306 is used to physically stop the continued upward movement of the positioning device 303, thereby defining the initial absolute spatial position of the positioning device 303, i.e., the zero-point position. Under this constrained state, the first actual release length of the connecting line 302 when the positioning device 303 is in the zero-point position is defined as the metering zero point of the level gauge 30.

[0084] It is understandable that the aforementioned contact refers to a mechanical engagement state in which two mechanical components with rigidity characteristics make direct surface contact in space and generate mutual normal forces, thereby forcibly restricting one of the components from continuing to make linear displacement along a predetermined direction of motion.

[0085] As one implementation, the level gauge 30 also includes the aforementioned mechanical sensor 3010. The mechanical sensor 3010 is used to measure the longitudinal tension parameter borne on the connecting line 302 in real time and continuously, so that the data processing system 10 can determine whether the positioning device 303 is in contact with the limiting device 306 based on the dynamic changes in this tension parameter. Specifically, when the positioning device 303 is in a free-hanging state inside the container space, the tension parameter is mainly composed of the constant gravity of the positioning device 303 itself and the gravity of the released portion of the connecting line 302. Once the positioning device 303 rises and contacts the limiting device 306, the rigid surface of the limiting device 306 will cause a change in the load tension originally acting on the connecting line 302. When the processor 100 of the data processing system 10 detects that the tension parameter rises rapidly and exceeds a preset tension threshold, it can determine that the aforementioned physical contact event has occurred.

[0086] As another implementation method, or in conjunction with the above-mentioned mechanical detection method, the limiting device 306 may also include a micro switch 306b.

[0087] Among them, the micro switch 306b refers to a contact-type electrical switching device with a small contact interval and a fast-acting mechanical mechanism, capable of switching actions using a specified mechanical physical stroke and a specified contact thrust. For example... Figure 2dAs shown, the micro switch 306b can be deployed, for example, on the lower surface of the limiting device 306 and close to the force-bearing area of ​​the limiting gap 306a. When the positioning device 303 rises and abuts against the limiting device 306, its outer mechanical housing will directly and physically contact and press upward against the mechanical actuating contact of the micro switch 306b. This pressing action causes the electrical contact state inside the micro switch 306b to flip and switch, for example, from a normally open state to a closed conducting state, thereby outputting a transient level trigger signal to the data processing system 10. After receiving the level trigger signal, the processor 100 can determine that the positioning device 303 has abutted against the limiting device 306.

[0088] It should be noted that the above-mentioned different ways of implementing the deterministic abutment function are merely illustrative examples and are not intended to limit the scope of the invention.

[0089] Understandably, the introduction of the mechanism based on the physical stop and status detection of the limit device 306 brings significant benefits. As the level gauge 30 operates long-term in industrial settings, the connecting cable 302 inevitably experiences material fatigue, plastic deformation, or creep, and the winding device 301 and transmission components may accumulate minor backlash errors. By periodically controlling the positioning device 303 to return and forcibly engage with the limit device 306, the data processing system 10 can physically re-establish the system's mechanical measurement origin. This method of calibration by resetting the zero point effectively eliminates the static displacement offset that accumulates over time, ensuring high-precision automated maintenance capabilities throughout the equipment's service life without relying on manual intervention, and effectively improving the accuracy of level measurement.

[0090] The calibration method for the liquid level gauge provided in this application will now be described in detail by way of example.

[0091] See Figure 3 , Figure 3 This paper illustrates a flowchart of a calibration method for a level gauge according to an embodiment of this application. This method can be applied to... Figure 1 The data processing system 10 shown and Figure 2b The level gauge 30 shown can be applied to other suitable systems or level gauges. The following describes its application... Figure 1 The data processing system 10 and the level gauge 30 shown are used as examples for explanation. Figure 3 As shown, the method may specifically include the following steps.

[0092] S301: Processor 100 controls winding device 301 to retract connecting line 302.

[0093] S302: During the process of the winding device 301 retracting the connecting wire 302, when the positioning device 303 abuts against the limiting device 306, the processor 100 determines that the positioning device 303 is at the zero point position under the stop action of the limiting device 306.

[0094] It should be noted that the mechanical drive and state feedback logic for steps S301 and S302 has been described in detail above and will not be repeated here.

[0095] S303: When the positioning device 303 is at the zero position, the processor 100 determines the first actual release length of the connecting line 302.

[0096] For example, when the processor 100 confirms that the positioning device 303 is at the physical limit position (i.e., the aforementioned zero point position) by analyzing the tension signal of the force sensor 3010 or the level signal of the micro switch 306b, the processor 100 can simultaneously read the cumulative rotation data of the measuring component (e.g., the first encoder 319 or the second encoder 329) at the current moment. Based on this current cumulative rotation data and combined with the geometric parameters of the transmission mechanism, the processor 100 calculates the length of the connecting line 302 released by the winding device 301 at this moment, and this value is recorded as the first actual release length.

[0097] Understandably, if the connecting wire 302 undergoes irreversible physical extension due to long-term stress, the first actual release length will no longer be the theoretical absolute zero value or the factory default value in the numerical representation within the system, but will include a deviation increment.

[0098] S304: The processor 100 calibrates the first actual release length of the connection line 302 to the metering zero point.

[0099] For example, the processor 100 can overwrite the value of the first actual release length obtained in step S303 as the new relative coordinate system origin, i.e., the aforementioned measurement zero point. It is understood that by defining the count value of the connecting line 302, which may have undergone minor geometric deformation, at a specific physical boundary (zero point position) as the new measurement zero point, the data processing system 10 can, in its software operation logic, shield the accumulated absolute physical length changes of the connecting line 302. All subsequent release measurement actions can be performed based on this new measurement zero point to calculate relative differences, thereby offsetting the previously generated mechanical extension length in the mathematical model as much as possible. This achieves adaptive software compensation of the measurement system and effectively improves measurement accuracy.

[0100] After calibrating the actual release length of the connecting line 302 to the measurement zero point, the level gauge 30 can then enter the formal level measurement process.

[0101] For example, the processor 100 can determine a second actual release length of the connecting line 302 when the winding device 301 releases the connecting line 302 so that the positioning device 303 reaches the liquid surface. The specific details of the processor 100 determining the second actual release length can be found in step S303 above, and will not be repeated here. Furthermore, the processor 100 can determine the liquid level based on the second actual release length, the first actual release length, and the reference release length of the connecting line 302 when the positioning device 303 is initially in the zero position.

[0102] It should be noted that the aforementioned reference release length refers to the standardized release length value of the connecting line 302 recorded by the system when the level gauge 30 is in its initial factory calibration state, or in its brand new initial state before the connecting line 302 has been stretched under any gravitational load, and the positioning device 303 is at the origin when it abuts the limiting device 306. This reference release length can be permanently stored in the memory 200 as an immutable constant.

[0103] The specific logic for determining the liquid level based on multidimensional length data can, for example, include several different implementation methods.

[0104] In the first implementation, since the first actual release length has been established as the absolute measurement zero point by the system, the processor 100 can determine the second actual release length when the positioning device 303 is lowered to touch the liquid surface to be measured. The processor 100 can calculate the relative mathematical difference between the second actual release length and the first actual release length. This difference can be used to characterize the relative physical distance of the positioning device 303 falling purely from below the limiting device 306, and this displacement can be directly mapped to the liquid level value inside the container.

[0105] In the second implementation, considering the elastic extension of the connecting line 302, the processor 100 first calculates the algebraic difference between the first actual release length and the aforementioned reference release length to determine the total extension of the connecting line 302 during the current service cycle. Subsequently, when calculating the liquid level, the processor 100 further incorporates the extension of the connecting line 302 during the current release process as a compensation parameter, beyond the base difference between the second and first actual release lengths, to calculate a more accurate liquid level value. For example, this liquid level value can be the sum of the difference between the second and first actual release lengths and the extension offset. The aforementioned extension offset is the quantified value of the extension of the connecting line 302 during the current release process.

[0106] In addition, after determining the first actual release length of the connecting line 302, the processor 100 can also control the winding device 301 to release the connecting line 302, so that the positioning device 303 does not abut against the limiting device 306. This control link can be regarded as an overshoot protection and stress relief mechanism for the equipment hardware. It is understandable that if the positioning device 303 is always kept in a rigid compression state with the limiting device 306 after the zero-point calibration is completed, this long-term local physical stress may cause signal drift of the multi-functional sensor integrated inside the positioning device 303, or may cause fatigue cracking and structural damage to vulnerable parts such as the mechanical limiting body and the micro switch 306b. Therefore, after detecting the zero-point trigger and successfully acquiring the calibration data, the processor 100 controls the winding device 301 to stop the winding action (e.g., based on the servo motor 305) and instructs the winding device 301 to rotate in the opposite direction by a preset safety backtracking step. This safety backtracking step can, for example, correspond to a small displacement of about 2 to 5 millimeters downwards for the connecting line 302 on a physical scale.

[0107] During the retraction process, the processor 100 can continuously monitor the real-time readings of the mechanical sensor 3010. When the tension parameter smoothly recovers to the normal range corresponding to the current total weight of the suspension, the processor 100 verifies that the mechanical retraction disengagement action is successful and the equipment enters a stress-free safe standby state.

[0108] Optionally, to minimize random interference, the process of obtaining the first actual release length via the contact limiting device 306 can be implemented using a multiple-cycle measurement strategy. By controlling the level gauge 30 to execute steps S301 to S304 multiple times, multiple zero-point calibration data samples are obtained. The processor 100 processes the dataset based on a statistical algorithm to provide the most representative and accurate first actual release length. In the verification phase, the processor 100 evaluates the discrete error of the multiple measurement data. This error must not be too large to verify the rigidity and tightness of the entire mechanical transmission link, avoiding the introduction of systematic false calibration benchmarks due to microscopic slippage of the connecting line 302 on the surface of the synchronous pulley 307 or the winding device 301.

[0109] Optionally, after step S304, if the difference between the first actual release length and the reference release length does not meet the safe range, the processor 100 may report fault information. It is understood that this difference data objectively reflects the overall structural health of the connector 302. If this difference continues to increase and exceeds the upper limit of the pre-stored safe range, it indicates that the connector 302 has undergone extremely severe overstretching, and its material may be nearing the end of its service life. In the event of such a critical situation, the processor 100 immediately generates and reports fault information. This fault information may, for example, instruct the stopping of the liquid level measurement process, or alert technicians through other interactive components to intervene in maintenance and replacement, thereby reducing safety hazards.

[0110] Furthermore, this application also provides a calibration device for a level gauge. The level gauge includes a connecting wire, a positioning device, a winding device, and a limiting device. A first end of the connecting wire is wound around the winding device, and a second end of the connecting wire suspends the positioning device. The winding device releases the connecting wire so that when the positioning device reaches the liquid surface, the released length of the connecting wire indicates the liquid level. The limiting device includes a limiting gap through which the connecting wire passes, and the maximum dimension supported by the limiting gap is smaller than the dimension of the positioning device. (See also...) Figure 4 , Figure 4 This paper shows a schematic diagram of the structure of a calibration device for a level gauge according to an embodiment of this application. Figure 4 The calibration device 400 for the level gauge shown includes:

[0111] Control module 401 is used to control the winding device to retract the connecting line;

[0112] The determining module 402 is used to determine that the positioning device is at the zero position under the stop action of the limiting device when the positioning device abuts against the limiting device during the winding process of the connecting wire being retracted by the winding device; and to determine the first actual release length of the connecting wire when the positioning device is at the zero position.

[0113] The calibration module 403 is used to calibrate the first actual release length of the connecting wire to the measurement zero point.

[0114] In one possible implementation, after the calibration module 403 calibrates the actual release length of the connecting wire to the measurement zero point, the determining module 402 is further configured to determine the second actual release length of the connecting wire when the winding device releases the connecting wire so that the positioning device reaches the liquid surface; and determine the liquid level based on the second actual release length, the first actual release length, and the reference release length of the connecting wire when the positioning device is initially in the zero point position.

[0115] In one possible implementation, after the determining module 402 determines the first actual release length of the connecting line, the control module 401 is further configured to control the winding device to release the connecting line so that the positioning device does not abut against the limiting device.

[0116] In one possible implementation, the above-described device further includes a reporting module 404, which is used to report fault information when the difference between the first actual release length and the reference release length does not meet the safe range.

[0117] It should be noted that the information interaction and execution process between the modules and units of the above-mentioned device are based on the same concept as the method embodiment in this application, and the resulting technical effects are the same as those in the method embodiment in this application. For details, please refer to the description in the method embodiment shown above in this application, and it will not be repeated here.

[0118] Furthermore, embodiments of this application also provide a computing device. See also... Figure 5 , Figure 5 A schematic diagram of the hardware structure of a computing device according to an embodiment of this application is shown. Figure 5 As shown, computing device 500 may include processor 501 and memory 502.

[0119] The memory 502 is used to store computer programs;

[0120] The processor 501 is configured to execute the calibration method for the level gauge described in the above method embodiments according to the computer program.

[0121] In addition, this application embodiment also provides a computer-readable storage medium for storing a computer program for executing the level gauge calibration method described in the above method embodiment.

[0122] In addition, this application also provides a computer program product containing instructions that, when run on a computing device, causes the computing device to perform the level gauge calibration method described in the above method embodiments.

[0123] In the embodiments of this application, the "first" in names such as "first end" is only used for name identification and does not represent the first in order. This rule also applies to "second," "third," etc.

[0124] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the methods of the above embodiments can be implemented by means of software plus a general-purpose hardware platform. Based on this understanding, the technical solution of this application can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as a read-only memory (ROM) / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network communication device such as a router) to execute the methods described in various embodiments or some parts of the embodiments of this application.

[0125] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the device embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. The device embodiments described above are merely illustrative. Modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0126] The above description is merely an exemplary implementation of this application and is not intended to limit the scope of protection of this application.

Claims

1. A level gauge, characterized in that, The level gauge includes a connecting line, a positioning device, a guiding device, and a winding device. The connecting line has a flat strip structure. The first end of the connecting line is wound around the winding device, the second end of the connecting line is suspended from the positioning device, the connecting line is wound around the guiding device, and the wide surface of the connecting line is limited and fitted to the guiding device. Under the guidance of the guiding device, the winding device releases the connecting line so that when the positioning device reaches the liquid surface, the release length of the connecting line is used to indicate the liquid level of the liquid surface.

2. The level gauge according to claim 1, characterized in that, The level gauge also includes a limiting device, which includes a limiting gap for the connecting wire to pass through, and the maximum dimension that the limiting gap supports is smaller than the dimension of the positioning device. During the winding process of the connecting wire being retracted, when the positioning device abuts against the limiting device, the limiting device is used to stop the positioning device to limit the zero point position of the positioning device. When the positioning device is at the zero point position, the first actual release length of the connecting wire is the measurement zero point.

3. The level gauge according to claim 2, characterized in that, The level gauge also includes a mechanical sensor for measuring the tension on the connecting line to determine whether the positioning device abuts against the limiting device. And / or, The limiting device includes a micro switch, which is used to determine whether the positioning device abuts against the limiting device.

4. The level gauge according to any one of claims 1-3, characterized in that, The level gauge also includes a first encoder, which is connected to the winding device. The first encoder is used to measure the rotation of the winding device to determine the release length of the connecting wire. And / or, The level gauge also includes a second encoder and a synchronous pulley. The wide surface of the connecting wire is provided with a plurality of positioning holes spaced apart along the retraction direction. The outer circumferential surface of the synchronous pulley is provided with engagement protrusions that are adapted to the plurality of positioning holes. The connecting wire passes around the synchronous pulley and engages with the synchronous pulley for transmission. The second encoder is connected to the synchronous pulley and is used to measure the rotation of the synchronous pulley to determine the release length of the connecting wire.

5. The level gauge according to claim 4, characterized in that, The level gauge includes the second encoder and the synchronous pulley. The level gauge also includes a clamping device for clamping the connecting wire to the outer circumferential surface of the synchronous pulley for engagement.

6. A calibration method for a liquid level gauge, characterized in that, The level gauge includes a connecting wire, a positioning device, a winding device, and a limiting device. A first end of the connecting wire is wound around the winding device, and a second end of the connecting wire is suspended from the positioning device. The winding device releases the connecting wire so that when the positioning device reaches the liquid surface, the release length of the connecting wire is used to indicate the liquid level. The limiting device includes a limiting gap through which the connecting wire passes, and the maximum dimension that the limiting gap supports is smaller than the dimension of the positioning device. The method includes: The winding device is controlled to retract the connecting wire; During the process of the winding device retracting the connecting wire, when the positioning device abuts against the limiting device, it is determined that the positioning device is at the zero position under the stop action of the limiting device. When the positioning device is at the zero point position, determine the first actual release length of the connecting line; The first actual release length of the connecting line is calibrated to the measurement zero point.

7. The method according to claim 6, characterized in that, After calibrating the actual release length of the connecting wire to the metering zero point, the method further includes: Determine the second actual release length of the connecting line when the winding device releases the connecting line so that the positioning device reaches the liquid surface; The liquid level is determined based on the second actual release length, the first actual release length, and the reference release length of the connecting line when the positioning device is initially at the zero point position.

8. The method according to claim 6 or 7, characterized in that, After determining the first actual release length of the connector, the method further includes: Control the winding device to release the connecting line so that the positioning device does not abut against the limiting device.

9. The method according to claim 7, characterized in that, The method further includes: If the difference between the first actual release length and the reference release length does not meet the safe range, a fault information is reported.

10. A computer program product containing instructions, characterized in that, When it is run on a computing device, it causes the computing device to perform the method as described in any one of claims 6 to 9.

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