Non-invasive liquid level detection device and gas detection apparatus

Abstract

The utility model relates to non -invasive liquid level position detection device and special gas equipment, and liquid level position detection device includes rigid installation module, longitudinal movement module, constant force pre -tension module, multi -axial adjustment module and ultrasonic module. Its advantage lies in, realized the absolute stability of measurement reference, the accuracy and repeatability get the qualitative promotion, rooted out the medium interference source, guaranteed the pure reliable of measurement signal, guaranteed the best acoustics coupling, improved the signal quality and success rate, realized the unmanned, automation monitoring, greatly promoted the detection efficiency, realized real -time response, expanded the applicable scope of device, is not limited by the container surface condition, improved the security and long -term reliability of equipment.

Description

Technical Field

[0001] This utility model relates to the field of liquid detection technology for liquid storage containers, and to a non-invasive liquid level detection device and special gas equipment. Background Technology

[0002] In industrial production, energy storage, and chemical preparation, liquid level measurement is a crucial step in ensuring the safe operation of equipment and precise process control. Ultrasonic liquid level measurement technology has become one of the mainstream measurement solutions due to its advantages such as non-contact measurement, fast response speed, and wide applicability to a wide range of media.

[0003] Chinese utility model patent CN2229655Y discloses a liquid-isolated ultrasonic level measuring device. Its innovation lies in "indirect measurement + media isolation," using multi-stage liquid pressure transmission to avoid direct contact between the ultrasonic transducer and the measured liquid, thus solving the problem of interference from corrosive and turbid liquids on the measuring element. The system consists of a test container, an isolation medium tank, a working medium tank, a measuring tube, and an ultrasonic transducer. The workflow is divided into four steps: 1) Initial pressure transmission: Under static pressure, the liquid at the bottom of the test container flows into the isolation medium tank through the connecting pipe, completing the initial pressure transmission; 2) Medium isolation and protection: The isolation medium tank is filled with an isolation medium that is immiscible with the test liquid and has a lower density (such as gasoline separating diesel). The test liquid squeezes the isolation medium to form a physical isolation layer, preventing contamination of subsequent processes; 3) Secondary pressure transmission: The pressurized isolation medium flows into the working medium tank through the top pipe, further squeezing the working medium (such as brine) in the tank, realizing secondary pressure transmission; 4) Final ultrasonic measurement: The working medium is pressurized and enters the vertical measuring tube. The ultrasonic transducer at the bottom of the tube emits sound waves. The liquid level of the working medium is calculated by detecting the reflection time, and the liquid level of the test liquid is inferred from the reflection time. Furthermore, it claims the following advantages: 1) High-precision indirect measurement: Media isolation physically isolates the transducer from the measured liquid, avoiding interference from liquid corrosivity and turbidity on ultrasonic wave propagation; 2) Weight conversion function: Based on the principle of static pressure balance, combined with the working medium density and the cross-sectional area of ​​the measured container, the weight of the measured liquid can be accurately calculated; 3) Low cost and easy installation: The structure mainly uses conventional tanks and pipes, without complex precision parts, resulting in low manufacturing costs and simple installation, meeting the needs of continuous measurement. However, in practical applications, the following defects exist: 1) Cross-contamination of multiple media, leading to systematic measurement errors: The system relies on the fact that the measured medium, isolation medium, and working medium are completely immiscible and have a clear interface. However, temperature fluctuations, equipment vibrations, and pressure changes in industrial scenarios can disrupt interface stability, leading to trace amounts of mutual solubility, penetration, or emulsification of the media. For example, diesel and gasoline are miscible, and gasoline seeps into salt water, which changes the working medium density and sound velocity. Since the measurement results are highly dependent on the working medium density, the deviation will produce systematic and irreversible errors, which accumulate over time and are difficult to calibrate. 2) Multiple temperature effects cause measurement drift: The densities of all three liquids change with temperature; as temperature increases, density decreases and static pressure decreases, and vice versa. This sensitivity is amplified through multiple stages of transmission. For every 5°C change in ambient temperature, the liquid level in the measuring tube may drift by 1%-3%. In high-precision scenarios such as chemical reaction tanks, this can easily affect the accuracy of process parameters and pose safety risks. 3) Fluid inertia causes response delay, making it unsuitable for dynamic measurement scenarios: Liquid level changes require physical flow transmission through "measured liquid → isolation medium → working medium → measuring tube." Fluid inertia and viscosity cause a time delay in flow. When the liquid level in the measured container changes rapidly (such as rapid oil filling in an oil tank), the response lag can reach 5-10 seconds, failing to meet the dynamic monitoring needs such as emergency warnings. It is only suitable for static scenarios with slow liquid level changes.4) Complex structure leads to difficult installation and maintenance, increasing the risk of leakage: The system requires the installation of multiple tanks and pipelines, and the height difference between the tanks must be strictly calibrated. The installation and commissioning cycle is long and the accuracy requirements are high. Pipe interfaces and valves are potential leakage points. Media leakage will cause measurement failure and may also pollute the environment or cause safety accidents. The maintenance work of regularly replenishing and replacing the three media is cumbersome and increases operating costs.

[0004] Chinese utility model patent CN220960239U discloses an ultrasonic liquid level measuring device. Aiming to solve the problem of "temporary portable installation" of ultrasonic liquid level gauges, its key innovation is a "vacuum adsorption fixing device," which allows for quick fixing without the need for container openings or welding. The structure includes a measuring body, a fixing frame with four legs, a rubber adsorption chamber (suction cup), a negative pressure pump, and a solenoid valve. The working process is as follows: 1) Fixing frame positioning: The operator places the device's legs against the measuring position on the outer wall of the container, ensuring close contact between the rubber adsorption chamber and the container surface; 2) Negative pressure generation and adsorption: The built-in negative pressure pump is activated, drawing air from the adsorption chamber through internal pipes to create a vacuum; 3) Atmospheric pressure fixing: The pressure difference between the external atmospheric pressure and the vacuum in the adsorption chamber firmly fixes the device to the container surface; 4) Energy-saving vacuum maintenance: After adsorption is complete, the solenoid valve is closed, locking the vacuum state and stopping the negative pressure pump to reduce energy consumption. Furthermore, it claims the following advantages: 1) Portability and versatility: No container modification is required; it can be quickly installed on different container surfaces, adapting to multiple scenarios; 2) Stable measurement accuracy: Vacuum adsorption avoids manual support and shaking, improving measurement stability; 3) Energy-saving design: The combination of "negative pressure pump vacuuming + solenoid valve locking" eliminates the need for continuous pump operation, reducing energy consumption; 4) Intelligent data transmission: An integrated intelligent push system can send measurement data to the user terminal in real time, enabling remote monitoring. However, in practical applications, the following drawbacks exist: 1) Stringent requirements for container surface conditions, limiting versatility: Vacuum adsorption relies on the adsorption chamber and the container surface to form a sealed vacuum cavity, requiring a smooth, clean, non-porous, and flat surface. However, industrial containers (such as steel oil tanks and concrete tanks) commonly have rust, oil stains, and uneven surfaces; some containers (such as liquefied gas cylinders) have curved surfaces, all of which compromise the seal, making it impossible to fix the device securely. The device's compatibility with common industrial containers is less than 30%, and its "versatility" is limited to ideal laboratory environments. 2) Vacuum leakage leads to adsorption failure and poses safety risks: There is no absolutely sealed structure at the physical level. Gaps may appear at the edges of the rubber adsorption chamber due to aging and wear. The solenoid valve core may become stuck due to impurities, causing slow vacuum leakage. After 24-48 hours of installation, the adsorption force may drop to less than 50% of its initial value. This can lead to device displacement and damage to the measurement benchmark, or even device detachment and equipment damage. If the container is located at a high altitude (such as the top of a reaction tower), it may also cause a fall accident. 3) Non-rigid fixation results in poor vibration resistance and insufficient measurement stability: The device is connected to the container via a flexible rubber suction cup. Vibrations from motors, equipment start-up and shutdown, and material conveying in industrial environments can cause relative displacement or shaking between the device and the container surface. Ultrasonic measurements require extremely high probe position stability; a probe offset of 0.5mm can increase the error by 5%-8%. In high-vibration environments such as oil refineries and pump rooms, measurement data fluctuates drastically, and may even fail to produce valid results.4) Reliance on manual operation, unable to achieve unmanned long-term monitoring: The "portability" of this technology is essentially a cycle of "manual installation-measurement-disassembly," which cannot achieve long-term continuous measurement at a fixed location. If 24 / 7 monitoring of the tank level is required, manual checks of the adsorption status and re-fixing of the offset device are necessary, increasing labor costs and potentially causing measurement interruptions due to missed inspections. In addition, the device relies on batteries or temporary wiring for power, which cannot meet the long-term power supply needs of industrial sites, limiting its application in unmanned scenarios such as remote oil storage stations.

[0005] As can be seen from the above, current ultrasonic liquid level measuring devices have the following core problems: 1) Insufficient accuracy and stability: CN2229655Y suffers from errors due to multi-media contamination and temperature drift, while CN220960239U suffers from accuracy issues due to fixed offset and vibration interference. Neither of them can maintain high-precision measurement for a long time. 2) Limited applicability: CN2229655Y is only suitable for static, low-temperature fluctuation scenarios, and CN220960239U is only suitable for ideal surface containers. Neither can cover complex industrial environments. 3) Safety and maintenance risks: CN2229655Y has the risk of media leakage, and CN220960239U has the risk of device detachment. In addition, the maintenance process of both is complicated or relies on manual labor, which increases operating costs. 4) Lack of dynamic and unmanned adaptation: The response delay of CN2229655Y cannot adapt to dynamic scenarios, and CN220960239U relies on manual operation and cannot achieve long-term unmanned monitoring. Both are difficult to meet the intelligent and automated needs of modern industry. Therefore, developing an ultrasonic liquid level measuring device that combines high precision, high stability, wide applicability, and adaptability to dynamic measurement and unmanned monitoring has become a key direction for solving the pain points of industrial liquid level measurement, and is of great significance for improving production efficiency and ensuring operational safety.

[0006] In summary, no effective solution has yet been proposed to address the existing problems of poor accuracy and stability, limited applicability, and security risks. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing a non-invasive liquid level detection device and special gas equipment, thereby solving problems such as poor accuracy and stability, limited applicability, and safety risks in related technologies.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows: In a first aspect, a non-invasive liquid level detection device is provided for detecting the liquid level position of a cylindrical container, comprising: Rigidly installed module; A longitudinally moving module, wherein the longitudinally moving module is disposed on the rigid mounting module; A constant force preload module is disposed on the longitudinal moving module and is used to reciprocate in the vertical direction under the action of the longitudinal moving module; A multi-axial adjustment module is provided on the constant force preload module and is used to follow the constant force preload module in reciprocating motion in the vertical direction and in moving in the horizontal direction under the action of the constant force preload module. An ultrasonic module is disposed on the multi-axial adjustment module and is used to follow the multi-axial adjustment module to move in the vertical and / or horizontal direction, move in three-dimensional space under the action of the multi-axial adjustment module, and emit and receive ultrasonic signals. In this process, under the combined action of the constant force pre-tightening module and the multi-axial adjustment module, the ultrasonic module is in close contact with the outer wall of the cylindrical container to be tested.

[0009] In some embodiments, the longitudinal movement module includes: A first rotating seat element is disposed at the first end of the rigid mounting module; The second rotating seat element is disposed at the second end of the rigid mounting module; A motor component, wherein the motor component is disposed at the end of the rigid mounting module; A lead screw element is connected to the motor element and rotatably connected to the first rotating seat element and the second rotating seat element, respectively, for rotating under the action of the motor element; At least one lead screw nut element, which is connected to the lead screw element for reciprocating motion along the lead screw element under the action of the lead screw element; At least one fixed plate element is connected to the lead screw and nut element and is used to follow the lead screw and nut element in reciprocating motion along the lead screw element; A connecting plate element is connected to the fixed plate element and the constant force preload module respectively, and is used to follow the fixed plate element to drive the constant force preload module to reciprocate along the lead screw element.

[0010] In some embodiments, the longitudinal movement module further includes: At least one sliding rail element is disposed in the rigid mounting module and located between the first rotating seat element and the second rotating seat element; At least one sliding block element is provided, which is connected to the corresponding fixed plate element and slidably connected to the corresponding sliding track element, for assisting the fixed plate element in reciprocating motion along the lead screw element.

[0011] In some embodiments, the longitudinal movement module further includes: At least one first buffer block element is disposed on the first rotating seat element to buffer the fixed plate element and prevent the fixed plate element from contacting the first rotating seat element.

[0012] In some embodiments, the longitudinal movement module further includes: At least one second buffer block element is disposed on the second rotating seat element to buffer the fixed plate element and prevent the fixed plate element from contacting the second rotating seat element.

[0013] In some embodiments, the longitudinal movement module further includes: A coupling element is disposed between the motor element and the lead screw element, and is connected to both the motor element and the lead screw element, for driving the lead screw element to rotate under the action of the motor element.

[0014] In some embodiments, the longitudinal movement module further includes: At least one first bearing element is disposed on the first rotating seat element and rotatably connected to the lead screw element to assist the lead screw element in rotation.

[0015] In some embodiments, the longitudinal movement module further includes: At least one second bearing element is disposed on the second rotating seat element and rotatably connected to the lead screw element to assist the lead screw element in rotation.

[0016] In some embodiments, the longitudinal movement module further includes: At least one padding element is disposed at the end of the lead screw element; At least one locking nut element is connected to the lead screw element and abuts against the gasket element.

[0017] In some embodiments, the longitudinal movement module further includes: The mounting bracket element is disposed at the end of the rigid mounting module and connected to the motor element.

[0018] In some embodiments, the constant force preload module includes: Mounting base element, the mounting base element is disposed on the longitudinal moving module, and is used to reciprocate in the vertical direction under the action of the longitudinal moving module; A push rod element is movably disposed on the side of the mounting base element and connected to the multi-axial adjustment module; A guide cylinder element, which is connected to the mounting base element and movably connected to the push rod element, is used to allow the push rod element to move along the guide cylinder element; A spring element is disposed between the push rod element and the guide cylinder element to define the relative position of the push rod element and the guide cylinder element; The first universal ball joint element is disposed at the end of the push rod element and is movably connected to the multi-axial adjustment module.

[0019] In some embodiments, the push rod element includes: The first top rod is movably disposed on the side of the mounting base element and movably connected to the guide cylinder element; The second top rod is disposed at the end of the first top rod. The end of the second top rod is provided with the first universal ball joint element and is movably connected to the guide cylinder element. The outer diameter of the second top rod is smaller than the outer diameter of the first top rod.

[0020] In some embodiments, the first universal ball joint element includes: A first support rod is disposed at the end of the top rod element; The first ball joint is disposed at the end of the first support rod and is movably connected to the multi-axial adjustment module.

[0021] In some embodiments, the multi-axial adjustment module includes: Universal base element, wherein the universal base element is disposed between the constant force preload module and the ultrasonic module; The first universal ball joint element is disposed at the first end of the universal base element and is movably connected to the constant force preload module. The second universal ball joint element is disposed at the second end of the universal base element and is movably connected to the ultrasonic module.

[0022] In some embodiments, the ultrasonic module includes: Fixed base components; An ultrasonic transmitting element, wherein the ultrasonic transmitting element and the fixed base element are used to follow the fixed base element in three-dimensional space and to emit ultrasonic signals; An ultrasonic receiving element is disposed on the fixed base element and is used to follow the fixed base element in three-dimensional space and to receive ultrasonic signals. A protective cover element, which is connected to the fixed base element; A coupling cover element, wherein the coupling cover element is disposed on the protective cover element; The second universal ball joint element is disposed on the side of the fixed base element and is movably connected to the multi-axial adjustment module. It is used to follow the multi-axial adjustment module to drive the fixed base element to move in the vertical and / or horizontal direction, and to drive the fixed base element to move in three-dimensional space under the action of the multi-axial adjustment module.

[0023] In some embodiments, the second omnidirectional ball joint element includes: The second support rod is disposed on the side of the fixed base element; The second ball joint is disposed at the end of the second support rod and is movably connected to the multi-axial adjustment module.

[0024] In some of these embodiments, it also includes: The main control module is communicatively connected to the longitudinal movement module and the ultrasonic module.

[0025] Secondly, a special gas device is provided, comprising: Main framework; The liquid level detection device as described in the first aspect is mounted on the main frame.

[0026] The present invention adopts the above technical solution and has the following technical effects compared with the prior art: 1) Absolute stability of the measurement benchmark is achieved, and the accuracy and repeatability are significantly improved: Through the "hard connection" between the high-rigidity structure and the main frame of the equipment, the benchmark displacement caused by vibration, impact or temporary loose fixing (such as the vacuum suction cup of the existing technology) is completely eliminated; it ensures that each scan is performed in the exact same coordinate system, thus guaranteeing the high consistency and repeatability of the measurement results. 2) Eliminating the source of media interference ensures the purity and reliability of the measurement signal: The non-invasive direct measurement method avoids the cross-contamination, emulsification and complex temperature drift problems that may occur due to the transmission of multiple liquid media in the existing technology. This makes the physical interpretation model of the measurement signal simpler and purer, and ensures the reliability of the data from the source. 3) It ensures optimal acoustic coupling and improves signal quality and success rate: The unique "adaptive acoustic coupling sensor head" structure, through the cooperation of constant force pre-tightening module and multi-axial adjustment module, solves the problem of ultrasonic measurement on curved and imperfectly flat surfaces, ensuring that high-quality acoustic signals can be obtained every time, and greatly improving the success rate and stability of measurement. 4) It achieves unmanned and automated monitoring: Once installed, the device can perform fully automatic periodic scanning and data reporting according to PLC or host computer instructions; this completely replaces all manual intervention steps in the original ultrasonic measurement work (such as moving equipment, manual positioning, and reading data), freeing maintenance personnel from repetitive and tedious on-site measurement work.

[0027] 5) Significantly improves detection efficiency and enables real-time response: Automated scanning and near-instantaneous electronic response shorten the complete measurement cycle of a gas cylinder to tens of seconds; this high efficiency allows for higher frequency monitoring, which can reflect the consumption of materials in the process in real time, providing a basis for immediate adjustment and decision-making.

[0028] 6) Expands the applicability of the device, no longer limited by the surface conditions of the container: The rigid fixed installation method allows it to be applied to various industrial containers with uneven surfaces, rust, non-magnetic surfaces (such as stainless steel), etc., completely solving the problem of narrow applicability caused by the reliance on vacuum suction cups in existing technologies; 7) Improved equipment safety and long-term reliability: Permanent rigid fixation eliminates the risk of accidental equipment detachment. Meanwhile, the modular design (such as replaceable protective covers for ultrasonic modules and separate main control modules) greatly simplifies maintenance procedures and reduces long-term costs. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a liquid level detection device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the longitudinal movement module according to an embodiment of the present utility model; Figure 3 This is a cross-sectional view of the longitudinal moving module according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of the incomplete assembly of the constant force preload module according to an embodiment of the present utility model; Figure 5 This is a schematic diagram of the incomplete assembly of the constant force preload module according to an embodiment of the present utility model; Figure 6 This is a schematic diagram of a multi-axial adjustment module according to an embodiment of the present invention; Figure 7 This is a cross-sectional view of a multi-axial adjustment module according to an embodiment of the present invention; Figure 8 This is a schematic diagram of an ultrasonic module according to an embodiment of the present invention; Figure 9 This is a cross-sectional view of an ultrasonic module according to an embodiment of the present invention.

[0030] The attached figures are labeled as follows: 100, rigid mounting module; 200. Longitudinal movement module; 201. First rotating seat element; 202. Second rotating seat element; 203. Motor element; 204. Lead screw element; 205. Lead screw nut element; 206. Fixed plate element; 207. Connecting plate element; 208. Sliding rail element; 209. Sliding block element; 210. First buffer block element; 211. Second buffer block element; 212. Coupling element; 213. First bearing element; 214. Second bearing element; 215. Shim element; 216. Locking nut element; 217. Mounting bracket element; 300. Constant force preload module; 301. Mounting base component; 302. Push rod component; 303. Guide cylinder component; 304. Spring component; 305. First universal ball joint component; 400. Multi-axis adjustment module; 401. Universal base element; 402. First universal ball joint element; 403. Second universal ball joint element; 500. Ultrasonic module; 501. Fixed base component; 502. Ultrasonic transmitting component; 503. Ultrasonic receiving component; 504. Protective cover component; 505. Coupling cover component; 506. Second universal ball joint component. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0034] An illustrative embodiment of this utility model, such as Figure 1 As shown, a non-invasive liquid level detection device for detecting the liquid level in a cylindrical container includes a rigid mounting module 100, a longitudinal movement module 200, a constant force pre-tightening module 300, a multi-axial adjustment module 400, and an ultrasonic module 500. The longitudinal movement module 200 is mounted on the rigid mounting module 100; the constant force pre-tightening module 300 is mounted on the longitudinal movement module 200 and is used for reciprocating vertically under the action of the longitudinal movement module 200; the multi-axial adjustment module 400 is mounted on the constant force pre-tightening module 300 and is used to follow the reciprocating vertical movement of the constant force pre-tightening module 300 and to move horizontally under the action of the constant force pre-tightening module 300; the ultrasonic module 500 is mounted on the multi-axial adjustment module 400 and is used to follow the multi-axial adjustment module 400 in vertical and / or horizontal directions, move in three-dimensional space under the action of the multi-axial adjustment module 400, and emit and receive ultrasonic signals.

[0035] In this process, under the combined action of the constant force pre-tightening module 300 and the multi-axial adjustment module 400, the ultrasonic module 500 is in close contact with the outer wall of the cylindrical container to be tested.

[0036] In this invention, cylindrical containers include, but are not limited to, steel cylinders, such as 47L steel cylinders.

[0037] In this invention, the solutions stored in the cylindrical container include, but are not limited to, high-purity fluids and special fluids, such as process gases used in semiconductor processes, for example, liquid ammonia.

[0038] In this invention, the connection between the modules (components) can be a fixed connection or a detachable connection, such as welding, bolting, snap-fitting, or plugging. These connection methods are all conventional techniques in the field and will not be elaborated further here.

[0039] In this invention, the rigid mounting module 100 has a plate-like structure. Generally, the rigid mounting module 100 is mounted on the structural frame of the main equipment (such as a special gas holder) to provide a stable reference platform.

[0040] Generally, the rigid mounting module 100 is connected to the main frame of the main equipment (such as special gas equipment) by bolts.

[0041] Generally, the rigid mounting module 100 is a high-rigidity structure.

[0042] In some of these embodiments, the rigid mounting module 100 includes, but is not limited to, a mounting base plate.

[0043] like Figures 2-3 As shown, the longitudinal movement module 200 includes a first rotating seat element 201, a second rotating seat element 202, a motor element 203, a lead screw element 204, at least one lead screw nut element 205, at least one fixed plate element 206, and a connecting plate element 207. The first rotating seat element 201 is disposed at the first end of the rigid mounting module 100; the second rotating seat element 202 is disposed at the second end of the rigid mounting module 100; the motor element 203 is disposed at the end of the rigid mounting module 100; the lead screw element 204 is connected to the motor element 203 and is rotatably connected to the first rotating seat element 201 and the second rotating seat element 202 respectively, for rotating under the action of the motor element 203; the lead screw nut element 205 is drivenly connected to the lead screw element 204, for reciprocating along the lead screw element 204 under the action of the lead screw element 204; the fixed plate element 206 is connected to the lead screw nut element 205, for following the lead screw nut element 205 in reciprocating along the lead screw element 204; the connecting plate element 207 is connected to the fixed plate element 206 and the constant force preload module 300 respectively, for following the fixed plate element 206 to drive the constant force preload module 300 in reciprocating along the lead screw element 204.

[0044] In this invention, the longitudinal movement module 200 converts rotational motion into linear motion, which can improve motion stability and motion accuracy.

[0045] The first rotating seat element 201 is detachably connected to the rigid mounting module 100, including but not limited to bolt connections.

[0046] Generally, the first rotating seat element 201 has a hollow structure. Specifically, the first rotating seat element 201 includes a first rotating seat member and a first through slot member. The first rotating seat member is disposed on the rigid mounting module 100; the first through slot member is disposed through the first rotating seat member for allowing the lead screw element 204 to rotate.

[0047] In some of these embodiments, the first rotating seat includes, but is not limited to, a mounting bracket.

[0048] In some of these embodiments, the first through-hole includes, but is not limited to, a through hole or a through groove.

[0049] The second rotating seat element 202 is detachably connected to the rigid mounting module 100, including but not limited to bolt connections.

[0050] Generally, the second rotating seat element 202 has a hollow structure. Specifically, the second rotating seat element 202 includes a second rotating seat member and a second through slot member. The second rotating seat member is disposed in the rigid mounting module 100; the second through slot member is disposed through the second rotating seat member for allowing the lead screw element 204 to rotate.

[0051] In some of these embodiments, the second rotating seat includes, but is not limited to, a mounting bracket.

[0052] In some of these embodiments, the second through-hole includes, but is not limited to, a through hole or a through groove.

[0053] The motor component 203 can be directly connected to the rigid mounting module 100 (e.g., by bolts) or indirectly connected through other structures (e.g., mounting brackets, mounting bases).

[0054] The motor element 203 is mounted at one end of the rigid mounting module 100 (either the first or the second end). Since the rigid mounting module 100 is vertically mounted, the motor element 203 is generally mounted at the top of the rigid mounting module 100 (usually the first end).

[0055] In some of these embodiments, the motor element 203 includes, but is not limited to, a stepper motor.

[0056] The lead screw element 204 is connected to the output end of the motor element 203, that is, it rotates under the action of the motor element 203.

[0057] The rotational connection between the lead screw element 204 and the first rotating seat element 201 and the second rotating seat element 202 can be a direct rotational connection or an indirect rotational connection (such as through other auxiliary rotational structures, such as bearings).

[0058] In some embodiments, the lead screw element 204 includes, but is not limited to, a transmission lead screw. For example, the lead screw element 204 includes a rod, a first threaded component, a first rotating shaft, and a second rotating shaft. The rod passes through the first rotating seat element 201 and the second rotating seat element 202, and one end of the rod is connected to the motor element 203 for rotation under the action of the motor element 203. The first threaded component is disposed on the outer edge surface of the rod and is threadedly connected to the lead screw nut element 205, for reciprocating motion of the lead screw nut element 205 along the rod. The first rotating shaft is disposed at the first end of the rod and is rotatably connected to the first rotating seat element 201. The second rotating shaft is disposed at the second end of the rod and is rotatably connected to the second rotating seat element 202. That is, the first and second ends of the lead screw element 204 are smooth rotating shafts, and a lead screw thread is provided between the first and second ends of the lead screw element 204.

[0059] It should be noted that the structure and manufacturing method of the transmission lead screw are conventional techniques in this field and will not be described in detail here.

[0060] The lead screw nut element 205 is threadedly connected to the lead screw element 204. When the lead screw element 204 rotates, the lead screw nut element 205 reciprocates along the axial direction of the lead screw element 204.

[0061] In some embodiments, there are multiple lead screw and nut elements 205. These multiple lead screw and nut elements 205 are spaced apart along the lead screw element 204 and are threadedly connected to the lead screw element 204, for moving simultaneously in the same direction under the action of the lead screw element 204.

[0062] In some embodiments, the lead screw nut element 205 has a T-shaped cross-section. Specifically, the lead screw nut element 205 includes a longitudinal connector, a transverse connector, and a second threaded component. The longitudinal connector is disposed on the fixed plate element 206; the transverse connector is disposed at the end of the longitudinal connector and connected to the fixed plate element 206 (e.g., by bolts); the second threaded component is disposed on the inner edge surface of the longitudinal connector and the inner edge surface of the transverse connector, and is threadedly connected to the lead screw element 204.

[0063] In some of these embodiments, the lead screw nut element 205 includes, but is not limited to, a lead screw nut.

[0064] It should be noted that the structure and manufacturing method of the lead screw nut are conventional techniques in this field and will not be described in detail here.

[0065] The fixed plate element 206 is detachably connected to the lead screw nut element 205, including but not limited to bolt connection.

[0066] The number of fixing plate components 206 matches the number of lead screw and nut components 205. Generally, the number of fixing plate components 206 is equal to the number of lead screw and nut components 205, that is, there is a one-to-one correspondence between the fixing plate components 206 and the lead screw and nut components 205.

[0067] In some embodiments, there are multiple fixing plate elements 206. The multiple fixing plate elements 206 are spaced apart along the length direction of the lead screw element 204.

[0068] In some embodiments, the fixing plate element 206 includes a fixing plate and a third through slot. The fixing plate is connected to the connecting plate element 207; the third through slot extends through the fixing plate and is connected to the lead screw and nut element 205. For example, the longitudinal connecting member of the lead screw and nut element 205 is fitted into the third through slot, and the transverse connecting member of the lead screw and nut element 205 is connected to the fixing plate.

[0069] In some of these embodiments, the fixing plate element 206 includes, but is not limited to, a fixing plate.

[0070] The connecting plate element 207 and the fixing plate element 206 are detachably connected, including but not limited to bolt connection.

[0071] In some embodiments, the end of the connecting plate element 207 protrudes beyond the end of the fixing plate element 206.

[0072] Furthermore, the end of the connecting plate element 207 protrudes from the end of the lead screw nut element 205 mounted on the fixing plate element 206.

[0073] In some embodiments, when the connecting plate element 207 moves to the starting position or the ending position, the bottom end of the connecting plate element 207 does not contact the top end of the first rotating seat element 201 or the top end of the second rotating seat element 202, i.e., a gap is left, so that the first rotating seat element 201 or the second rotating seat element 202 will not interfere with the connecting plate element 207.

[0074] In some embodiments, the connecting plate element 207 includes, but is not limited to, a connecting plate.

[0075] Furthermore, the longitudinal movement module 200 also includes at least one sliding track element 208 and at least one sliding block element 209. The sliding track element 208 is disposed in the rigid mounting module 100 and located between the first rotating seat element 201 and the second rotating seat element 202; the sliding block element 209 is connected to the corresponding fixed plate element 206 and slidably connected to the corresponding sliding track element 208, assisting the fixed plate element 206 in reciprocating motion along the lead screw element 204.

[0076] The sliding track element 208 is detachably connected to the rigid mounting module 100, including but not limited to bolt connections.

[0077] The two ends of the sliding track element 208 abut against the first rotating seat element 201 and the second rotating seat element 202, respectively.

[0078] In addition, the two ends of the sliding track element 208 can be detachably connected to the first rotating seat element 201 and the second rotating seat element 202 respectively, including but not limited to bolt connections.

[0079] Generally, the sliding track element 208 is arranged parallel to the lead screw element 204.

[0080] In some embodiments, there are multiple sliding track elements 208. These multiple sliding track elements 208 are symmetrically arranged on both sides of the lead screw element 204.

[0081] Preferably, there are two sliding track elements 208. That is, a sliding track element 208 is provided on the first side of the lead screw element 204, and a sliding track element 208 is provided on the second side of the lead screw element 204. The first side and the second side are opposite sides of the lead screw element 204.

[0082] In some embodiments, the cross-section of the sliding track element 208 is convex, I-shaped, or similar, thereby improving sliding stability.

[0083] In some of these embodiments, the sliding track element 208 includes, but is not limited to, a sliding track.

[0084] The sliding block element 209 is detachably connected to the fixed plate element 206, including but not limited to bolt connection.

[0085] Generally, the shape of the slider element 209 matches the shape of the slider track element 208.

[0086] The number of sliding block elements 209 matches the number of sliding track elements 208. Generally, the number of sliding block elements 209 is an integer multiple of the number of sliding track elements 208, that is, each sliding track element 208 is provided with at least one sliding block element 209. When each sliding track element 208 is provided with a plurality of sliding block elements 209, the plurality of sliding block elements 209 are spaced apart along the length direction of the sliding track element 208.

[0087] The number of sliding block elements 209 matches the number of fixed plate elements 206. Generally, the number of sliding block elements 209 is an integer multiple of the number of fixed plate elements 206, that is, each fixed plate element 206 is provided with at least one sliding block element 209. When a plurality of sliding block elements 209 are provided in each fixed plate element 206, the plurality of sliding block elements 209 are spaced apart along the length direction of the fixed plate element 206.

[0088] In one specific embodiment of this utility model, considering stability and cost, two fixed plate elements 206, two sliding track elements 208, and four sliding block elements 209 are provided. Each fixed plate element 206 has a sliding block element 209 at each of its two ends.

[0089] In some embodiments, the two ends of the sliding block element 209 protrude from the fixing plate element 206. The purpose of this arrangement is that when the ends of the sliding block element 209 contact the first rotating seat element 201 or the second rotating seat element 202, the fixing plate element 206 does not contact the first rotating seat element 201 or the second rotating seat element 202.

[0090] In some embodiments, the end of the sliding block element 209 does not protrude beyond the end of the connecting plate element 207.

[0091] In some of these embodiments, the slider element 209 includes, but is not limited to, a slider.

[0092] Furthermore, the longitudinal movement module 200 also includes at least one first buffer block element 210. The first buffer block element 210 is disposed on the first rotating seat element 201 and is used to buffer the fixed plate element 206 to prevent the fixed plate element 206 from contacting the first rotating seat element 201.

[0093] The first buffer block element 210 is detachably connected to the first rotating seat element 201, including but not limited to bolt connection.

[0094] In some embodiments, there are multiple first buffer block elements 210. The multiple first buffer block elements 210 are spaced apart along the length and / or height direction of the first rotating seat element 201.

[0095] Preferably, there are two first buffer block elements 210. The two first buffer block elements 210 are symmetrically arranged on both sides of the first through groove of the first rotating seat element 201.

[0096] In some of these embodiments, the first buffer element 210 is made of a buffer material, including but not limited to rubber, silicone, PU, ​​etc.

[0097] In some of these embodiments, the first buffer block element 210 includes, but is not limited to, a buffer pad, a buffer post, etc.

[0098] Furthermore, the longitudinal movement module 200 also includes at least one second buffer block element 211. The second buffer block element 211 is disposed on the second rotating seat element 202 and is used to buffer the fixed plate element 206 to prevent the fixed plate element 206 from contacting the second rotating seat element 202.

[0099] The second buffer block element 211 is detachably connected to the second rotating seat element 202, including but not limited to bolt connection.

[0100] In some embodiments, there are multiple second buffer block elements 211. The multiple second buffer block elements 211 are spaced apart along the length and / or height direction of the second rotating seat element 202.

[0101] Preferably, there are two second buffer block elements 211. The two second buffer block elements 211 are symmetrically arranged on both sides of the second through groove of the second rotating seat element 202.

[0102] In some of these embodiments, the second buffer element 211 is made of a buffer material, including but not limited to rubber, silicone, PU, ​​etc.

[0103] In some of these embodiments, the second buffer block element 211 includes, but is not limited to, a buffer pad, a buffer post, etc.

[0104] Furthermore, the longitudinal movement module 200 also includes a coupling element 212. The coupling element 212 is disposed between the motor element 203 and the lead screw element 204, and is connected to both the motor element 203 and the lead screw element 204, respectively, for driving the lead screw element 204 to rotate under the action of the motor element 203.

[0105] The coupling element 212 is detachably connected to the motor element 203 and the lead screw element 204, including but not limited to bolt connections.

[0106] In some of these embodiments, coupling element 212 includes, but is not limited to, a coupling.

[0107] Furthermore, the longitudinal movement module 200 also includes at least one first bearing element 213. The first bearing element 213 is disposed on the first rotating seat element 201 and rotatably connected to the lead screw element 204 to assist the lead screw element 204 in rotation.

[0108] In this invention, the purpose of providing the first bearing element 213 is to reduce the frictional force during the rotation of the lead screw element 204.

[0109] The first bearing element 213 is detachably connected to the first rotating seat element 201, including but not limited to bolt connection.

[0110] In some embodiments, there are multiple first bearing elements 213. The multiple first bearing elements 213 are spaced apart along the width direction of the first rotating seat element 201.

[0111] In some of these embodiments, the first bearing element 213 includes, but is not limited to, a bearing.

[0112] Furthermore, the longitudinal movement module 200 also includes at least one second bearing element 214. The second bearing element 214 is disposed on the second rotating seat element 202 and rotatably connected to the lead screw element 204 to assist the lead screw element 204 in rotation.

[0113] In this invention, the purpose of providing the second bearing element 214 is to reduce the frictional force during the rotation of the lead screw element 204.

[0114] The second bearing element 214 is detachably connected to the second rotating seat element 202, including but not limited to bolt connection.

[0115] In some embodiments, there are multiple second bearing elements 214. A plurality of first bearing elements 213 are spaced apart along the width direction of the second rotating seat element 202.

[0116] In some of these embodiments, the second bearing element 214 includes, but is not limited to, a bearing.

[0117] Furthermore, the longitudinal movement module 200 also includes at least one pad element 215 and at least one locking nut element 216. The pad element 215 is disposed at the end of the lead screw element 204; the locking nut element 216 is connected to the lead screw element 204 and abuts against the pad element 215.

[0118] The padding element 215 is fitted onto the lead screw element 204 and abuts against the first bearing element 213 or the second bearing element 214.

[0119] In some embodiments, there are two pad elements 215. One pad element 215 is disposed at the first end (first rotating shaft) of the lead screw element 204 and abuts against the first bearing element 213; the other pad element 215 is disposed at the second end (second rotating shaft) of the lead screw element 204 and abuts against the second bearing element 214.

[0120] In some of these embodiments, the padding element 215 includes, but is not limited to, a pad.

[0121] The locking nut element 216 is detachably connected to the lead screw element 204, including but not limited to bolt connection. Specifically, the locking nut element 216 is sleeved on the lead screw element 204 and then fixed by bolts.

[0122] The number of locking nut elements 216 matches the number of shim elements 215. Generally, the number of locking nut elements 216 is equal to the number of shim elements 215. That is, there is a one-to-one correspondence between locking nut elements 216 and shim elements 215.

[0123] In some embodiments, there are two locking nut elements 216. One locking nut element 216 is disposed at the first end (first rotating shaft) of the lead screw element 204; the other locking nut element 216 is disposed at the second end (second rotating shaft) of the lead screw element 204.

[0124] In some of these embodiments, the locking nut element 216 includes, but is not limited to, a locking nut.

[0125] Furthermore, the longitudinal movement module 200 also includes a mounting bracket element 217. The mounting bracket element 217 is disposed at the end of the rigid mounting module 100 and is connected to the motor element 203.

[0126] Mounting bracket element 217 is detachably connected to rigid mounting module 100 and motor element 203, including but not limited to bolt connection.

[0127] In some of these embodiments, mounting bracket element 217 includes, but is not limited to, mounting brackets.

[0128] like Figures 4-5 As shown, the constant force preload module 300 includes a mounting base element 301, a push rod element 302, a guide cylinder element 303, a spring element 304, and a first universal ball joint element 305. The mounting base element 301 is disposed on the longitudinal movement module 200 and is used for reciprocating motion in the vertical direction under the action of the longitudinal movement module 200. The push rod element 302 is movably disposed on the side of the mounting base element 301 and connected to the multi-axial adjustment module 400. The guide cylinder element 303 is connected to the mounting base element 301 and movably connected to the push rod element 302, allowing the push rod element 302 to move along the guide cylinder element 303. The spring element 304 is disposed between the push rod element 302 and the guide cylinder element 303, defining the relative position of the push rod element 302 and the guide cylinder element 303. The first universal ball joint element 305 is disposed at the end of the push rod element 302 and is movably connected to the multi-axial adjustment module 400.

[0129] Specifically, the mounting base element 301 is disposed on the connecting plate element 207 and is used to follow the connecting plate element 207 in reciprocating motion in the vertical direction.

[0130] In this utility model, the mounting base element 301 has a plate-like structure.

[0131] Generally, the mounting base element 301 is detachably connected to the connecting plate element 207, including but not limited to bolt connections.

[0132] Generally, the mounting base element 301 is a high-rigidity structure.

[0133] Generally, the end of the mounting base element 301 does not protrude from the connecting plate element 207.

[0134] In some embodiments, the mounting base element 301 includes a mounting base member, a fourth through groove member, and a third threaded member. The mounting base member is disposed on the connecting plate element 207; the fourth through groove member is disposed on the side of the mounting base member to accommodate the end of the push rod element 302; and the third threaded member is disposed on the inner wall of the fourth through groove member and is threadedly connected to the end of the guide cylinder element 303.

[0135] In some of these embodiments, the mounting base element 301 includes, but is not limited to, a mounting base plate.

[0136] The first end of the push rod element 302 is disposed inside the fourth through groove of the mounting base element 301, and the second end of the push rod element 302 is disposed outside the mounting base element 301.

[0137] In some embodiments, the cross-section of the push rod element 302 is convex. Specifically, the push rod element 302 includes a first push rod and a second push rod. The first end of the first push rod is disposed inside the fourth through groove of the mounting base element 301, and the second end of the first push rod is disposed outside the mounting base element 301 and connected to one end of the spring element 304, and slidably connected to the guide cylinder element 303. The second push rod is disposed at the second end of the first push rod, and the spring element 304 is sleeved on the second push rod. The second end of the second push rod protrudes from the guide cylinder element 303 and is provided with a first universal ball joint element 305, which is slidably connected to the guide cylinder element 303.

[0138] Generally, the outer diameter of the second top member is smaller than the outer diameter of the first top member.

[0139] In some of these embodiments, the push rod element 302 includes, but is not limited to, a push rod.

[0140] The guide cylinder element 303 is threadedly connected to the mounting base element 301.

[0141] In some embodiments, the guide cylinder element 303 includes a guide cylinder, a first sliding groove, a second sliding groove, and a fourth threaded element. The guide cylinder is fitted with a push rod element 302; the first sliding groove is disposed inside the guide cylinder and slidably connected to the first push rod of the push rod element 302; the second sliding groove is disposed at the end of the guide cylinder, communicates with the first sliding groove, and slidably connects to the second push rod of the push rod element 302; the fourth threaded element is disposed on the outer edge of the first end of the guide cylinder and is threadedly connected to the third threaded element of the mounting base element 301.

[0142] In some of these embodiments, the guide tube element 303 includes, but is not limited to, a guide tube.

[0143] Spring element 304 is disposed inside guide cylinder element 303 and is connected to push rod element 302 and guide cylinder element 303 respectively.

[0144] The spring element 304 can be connected to the push rod element 302 and the guide cylinder element 303 by welding or by abutment. These connection methods are conventional techniques in the field and will not be described in detail here.

[0145] In this invention, in the initial state, the spring element 304 is in a compressed state, at which time the first end of the push rod element 302 does not contact the end wall of the fourth through groove of the mounting base element 301; under the action of external force, the push rod element 302 moves, at which time the spring element 304 is stretched, and under the action of the return elastic force of the spring element 304, the push rod element 302 maintains a relatively opposite force to resist the external force, so that the ultrasonic module 500 can be tightly attached to the outer wall of the container. Under this condition, the first end of the push rod element 302 still does not contact the end wall of the fourth through groove of the mounting base element 301.

[0146] In some of these embodiments, the spring element 304 includes, but is not limited to, a spring.

[0147] The first universal ball joint element 305 is fixedly connected to the push rod element 302, including but not limited to welding, integral molding, etc.

[0148] In some embodiments, the first universal ball joint element 305 includes a first support rod and a first ball joint. The first support rod is disposed at the end of the top rod element 302; the first ball joint is disposed at the end of the first support rod and is movably connected to the multi-axial adjustment module 400.

[0149] In some of these embodiments, the first universal ball joint element 305 includes, but is not limited to, a universal ball joint.

[0150] like Figures 6-7 As shown, the multi-axial adjustment module 400 includes a universal base element 401, a first universal ball joint element 402, and a second universal ball joint element 403. The universal base element 401 is disposed between the constant force preload module 300 and the ultrasonic module 500; the first universal ball joint element 402 is disposed at the first end of the universal base element 401 and is movably connected to the constant force preload module 300; the second universal ball joint element 403 is disposed at the second end of the universal base element 401 and is movably connected to the ultrasonic module 500.

[0151] Specifically, the first universal ball joint element 402 is movably connected to the first universal ball joint element 305.

[0152] In some of these embodiments, the cross-section of the universal base element 401 is spindle-shaped.

[0153] In some of these embodiments, the universal base element 401 includes, but is not limited to, a universal base.

[0154] In some of these embodiments, the first universal ball joint element 402 includes, but is not limited to, a universal ball joint.

[0155] In some of these embodiments, the second universal ball joint element 403 includes, but is not limited to, a universal ball joint.

[0156] In this invention, the multi-axial adjustment module 400 allows for a swing angle of 30°.

[0157] like Figures 8-9 As shown, the ultrasonic module 500 includes a fixed base element 501, an ultrasonic transmitting element 502, an ultrasonic receiving element 503, a protective cover element 504, a coupling cover element 505, and a second universal ball joint element 506. The ultrasonic transmitting element 502 is fixed to the base element 501 and is used to follow the fixed base element 501 in three-dimensional space and to transmit ultrasonic signals. The ultrasonic receiving element 503 is disposed on the fixed base element 501 and is used to follow the fixed base element 501 in three-dimensional space and to receive ultrasonic signals. The protective cover element 504 is connected to the fixed base element 501. The coupling cover element 505 is disposed on the protective cover element 504. The second universal ball joint element 506 is disposed on the side of the fixed base element 501 and is movably connected to the multi-axial adjustment module 400, used to follow the multi-axial adjustment module 400 to drive the fixed base element 501 to move in the vertical and / or horizontal directions, and to drive the fixed base element 501 to move in three-dimensional space under the action of the multi-axial adjustment module 400.

[0158] Specifically, the second universal ball joint element 506 is movably connected to the second universal ball seat element 403.

[0159] In some of these embodiments, the fixed base element 501 includes, but is not limited to, a mounting base.

[0160] In some of these embodiments, the mounting base element 501 is made of abrasion-resistant materials, including but not limited to PEEK engineering plastics.

[0161] The ultrasonic transmitting element 502 is detachably connected to the fixed base element 501, including but not limited to bolt connection, adhesive connection, etc. Preferably, the ultrasonic transmitting element 502 is fixed inside the fixed base element 501 using acoustic epoxy resin.

[0162] In some embodiments, the ultrasonic emitting element 502 includes, but is not limited to, an ultrasonic transmitter.

[0163] The ultrasonic receiving element 503 is detachably connected to the fixed base element 501, including but not limited to bolt connection, adhesive connection, etc. Preferably, the ultrasonic receiving element 503 is fixed inside the fixed base element 501 using acoustic epoxy resin.

[0164] In some embodiments, the ultrasonic receiving element 503 includes, but is not limited to, an ultrasonic receiver.

[0165] In this invention, the ultrasonic transmitting element 502 and the ultrasonic receiving element 503 constitute an ultrasonic transducer. The protective cover element 504 is detachably connected to the fixed base element 501, including but not limited to threaded connection, adhesive connection, etc.

[0166] In some of these embodiments, the protective cover element 504 includes, but is not limited to, a protective cover.

[0167] In some of these embodiments, the protective cover element 504 is made of abrasion-resistant materials, including but not limited to PEek engineering plastics.

[0168] The coupling cover element 505 is disposed at the end of the protective cover element 504 to assist in the efficient and accurate transmission of ultrasonic waves.

[0169] In some of these embodiments, the coupling cap element 505 is made of a coupling material.

[0170] In some of these embodiments, the coupling cap element 505 is an end cap containing a coupling agent.

[0171] The second universal ball joint element 506 is fixedly connected to the fixed base element 501, including but not limited to welding, integral molding, etc.

[0172] In some embodiments, the second universal ball joint element 506 includes a second support rod and a second ball joint. The second support rod is disposed on the side of the fixed base element 501; the second ball joint is disposed at the end of the second support rod and is movably connected to the second universal ball joint element 403.

[0173] In some of these embodiments, the second universal joint element 506 includes, but is not limited to, a universal joint.

[0174] Furthermore, the liquid level detection device also includes a main control module. This main control module is communicatively connected to the longitudinal movement module 200 and the ultrasonic module 500.

[0175] Specifically, the main control module is communicatively connected to the motor component 203, the ultrasonic transmitting component 502, and the ultrasonic receiving component 503.

[0176] In some embodiments, the main control module includes a main controller, a drive circuit, a power supply module, and a data interface. The main controller integrates a microcontroller (MCU); the drive circuit includes a driver for controlling the motor element 203 and pulse and amplification circuits for controlling the ultrasonic transmitting element 502 and the ultrasonic receiving element 503; the power supply module receives external power and converts it into the different voltages required by each component; and the data interface provides an industrial bus interface for communication with external systems (such as a PLC).

[0177] The pulse and amplification circuit is used to transmit and receive ultrasonic signals.

[0178] In this utility model, the structure of the main control module and the connection method with each unit (component) are common technical means in this field, and will not be described in detail here.

[0179] The method of using this utility model is as follows: The main control module receives instructions from the host computer (PLC), parses the instructions, and obtains the pre-scan area; The motor component 203 drives the lead screw component 204 to rotate, which in turn moves the ultrasonic module 500 to a designated position (generally moving downwards vertically, which is usually the starting point of the pre-scanning area) through the lead screw nut component 205, the fixed plate component 206, the connecting plate component 207, the mounting base component 301, the push rod component 302, and the multi-axial adjustment module 400. (In this step, the motor component 203 has a relatively high output power, the lead screw component 204 rotates at a relatively fast speed, and the ultrasonic module 500 moves at a relatively fast speed.) When the ultrasonic module 500 moves to the designated position, the motor component 203 continues to operate, causing the ultrasonic module 500 to continue moving from the designated position along a preset direction (generally, moving downwards vertically). The ultrasonic transmitting element 502 emits ultrasonic signals, and the ultrasonic receiving element 503 receives the returned ultrasonic signals. (In this step, the output power of the motor component 203 is moderate, the rotation speed of the lead screw component 204 is moderate, and the moving speed of the ultrasonic module 500 is moderate.) (In this step, the emission frequency of the ultrasonic transmitting element 502 is low.) The main control module analyzes the received ultrasonic signal transmitted by the ultrasonic receiving element 503 to determine whether the detection location is a liquid phase (or whether the detection location is a liquid surface). If the detection location is in the gas phase, repeat the above steps; When the detection location is in the liquid phase, the main control module generates a verification area based on the detection location. Generally, the verification area is the coordinates of the detection location ± a preset distance value, that is, [the coordinates of the detection location - the preset distance value, the coordinates of the detection location + the preset distance value]. The motor component 203 operates to move the ultrasonic module 500 from the starting point of the verification area (i.e., the coordinates of the detection position minus a preset distance value) to the ending point of the verification area (i.e., the coordinates of the detection position plus a preset distance value). The ultrasonic transmitting element 502 emits and receives ultrasonic signals. The main control module analyzes the received ultrasonic signals transmitted by the ultrasonic receiving element 503 to obtain the first coordinate information for switching from the "gas phase" to the "liquid phase". (In this step, the output power of the motor component 203 is relatively low, the rotation speed of the lead screw component 204 is relatively slow, and the movement speed of the ultrasonic module 500 is relatively slow.) (In this step, the emission frequency of the ultrasonic transmitting element 502 is relatively high.) The motor component 203 operates to move the ultrasonic module 500 from the end point of the verification area to the beginning point of the verification area. The ultrasonic transmitting element 502 transmits and receives ultrasonic signals. The main control module analyzes the received ultrasonic signals transmitted by the ultrasonic receiving element 503 to obtain the second coordinate information for switching from the "liquid phase" to the "gas phase". (In this step, the output power of the motor component 203 is relatively low, the rotation speed of the lead screw component 204 is relatively slow, and the movement speed of the ultrasonic module 500 is relatively slow.) (In this step, the transmission frequency of the ultrasonic transmitting element 502 is relatively high.) The main control module calculates the average of the first coordinate information and the second coordinate information to obtain high-precision liquid surface coordinate information. Generally, the liquid surface coordinate information = (first coordinate information + second coordinate information) / 2. The main control module converts the liquid level coordinate information into the remaining mass and percentage of the liquid based on the internally preset association table. After completing the above steps, the motor component 203 stops working, or the motor component 203 works, driving the ultrasonic module 500 to move to the initial position or default position (such as the zero point position) through the lead screw nut component 205, the fixing plate component 206, the connecting plate component 207, the mounting base component 301, the push rod component 302, and the multi-axial adjustment module 400.

[0180] In this invention, the initial position or default position (such as the zero point position) is located at the top, meaning the coordinate information increases from top to bottom. Correspondingly, the remaining mass of the liquid decreases as the coordinate information increases.

[0181] The technical effects of this utility model are as follows: 1) Absolute stability of the measurement benchmark is achieved, and the accuracy and repeatability are significantly improved: Through the "hard connection" between the high-rigidity structure and the main frame of the equipment, the benchmark displacement caused by vibration, impact or temporary loose fixing (such as the vacuum suction cup of the existing technology) is completely eliminated; it ensures that each scan is performed in the exact same coordinate system, thus guaranteeing the high consistency and repeatability of the measurement results. 2) Eliminating the source of media interference ensures the purity and reliability of the measurement signal: The non-invasive direct measurement method avoids the cross-contamination, emulsification and complex temperature drift problems that may occur due to the transmission of multiple liquid media in the existing technology. This makes the physical interpretation model of the measurement signal simpler and purer, and ensures the reliability of the data from the source. 3) It ensures optimal acoustic coupling and improves signal quality and success rate: The unique "adaptive acoustic coupling sensor head" structure, through the cooperation of constant force pre-tightening module and multi-axial adjustment module, solves the problem of ultrasonic measurement on curved and imperfectly flat surfaces, ensuring that high-quality acoustic signals can be obtained every time, and greatly improving the success rate and stability of measurement. 4) It achieves unmanned and automated monitoring: Once installed, the device can perform fully automatic periodic scanning and data reporting according to PLC or host computer instructions; this completely replaces all manual intervention steps in the original ultrasonic measurement work (such as moving equipment, manual positioning, and reading data), freeing maintenance personnel from repetitive and tedious on-site measurement work.

[0182] 5) Significantly improves detection efficiency and enables real-time response: Automated scanning and near-instantaneous electronic response shorten the complete measurement cycle of a gas cylinder to tens of seconds; this high efficiency allows for higher frequency monitoring, which can reflect the consumption of materials in the process in real time, providing a basis for immediate adjustment and decision-making.

[0183] 6) Expands the applicability of the device, no longer limited by the surface conditions of the container: The rigid fixed installation method allows it to be applied to various industrial containers with uneven surfaces, rust, non-magnetic surfaces (such as stainless steel), etc., completely solving the problem of narrow applicability caused by the reliance on vacuum suction cups in existing technologies; 7) Improved equipment safety and long-term reliability: Permanent rigid fixation eliminates the risk of accidental equipment detachment. Meanwhile, the modular design (such as replaceable protective covers for ultrasonic modules and separate main control modules) greatly simplifies maintenance procedures and reduces long-term costs.

[0184] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A non-invasive liquid level detection device for detecting the liquid level position of a cylindrical vessel, characterized in that, include: Rigidly installed module; A longitudinally moving module, wherein the longitudinally moving module is disposed on the rigid mounting module; A constant force preload module is disposed on the longitudinal moving module and is used to reciprocate in the vertical direction under the action of the longitudinal moving module; A multi-axial adjustment module is provided on the constant force preload module and is used to follow the constant force preload module in reciprocating motion in the vertical direction and in moving in the horizontal direction under the action of the constant force preload module. An ultrasonic module is disposed on the multi-axial adjustment module and is used to follow the multi-axial adjustment module to move in the vertical and / or horizontal direction, move in three-dimensional space under the action of the multi-axial adjustment module, and emit and receive ultrasonic signals. In this process, under the combined action of the constant force pre-tightening module and the multi-axial adjustment module, the ultrasonic module is in close contact with the outer wall of the cylindrical container to be tested.

2. The liquid level detecting device according to claim 1, wherein The longitudinal movement module includes: A first rotating seat element is disposed at the first end of the rigid mounting module; The second rotating seat element is disposed at the second end of the rigid mounting module; A motor component, wherein the motor component is disposed at the end of the rigid mounting module; A lead screw element is connected to the motor element and rotatably connected to the first rotating seat element and the second rotating seat element, respectively, for rotating under the action of the motor element; At least one lead screw nut element, which is connected to the lead screw element for reciprocating motion along the lead screw element under the action of the lead screw element; At least one fixed plate element is connected to the lead screw and nut element and is used to follow the lead screw and nut element in reciprocating motion along the lead screw element; A connecting plate element is connected to the fixed plate element and the constant force preload module respectively, and is used to follow the fixed plate element to drive the constant force preload module to reciprocate along the lead screw element.

3. The liquid level detecting device according to claim 2, wherein The longitudinal movement module also includes: At least one sliding rail element is disposed in the rigid mounting module and located between the first rotating seat element and the second rotating seat element; At least one sliding block element, the sliding block element being connected to a corresponding fixed plate element and slidably connected to a corresponding sliding track element, for assisting the fixed plate element in reciprocating motion along the lead screw element; and / or At least one first buffer block element, disposed on the first rotating seat element, is used to buffer the fixed plate element to prevent the fixed plate element from contacting the first rotating seat element; and / or At least one second buffer block element, disposed on the second rotating seat element, is used to buffer the fixed plate element to prevent the fixed plate element from contacting the second rotating seat element; and / or A coupling element, wherein the coupling element is disposed between the motor element and the lead screw element, and is connected to both the motor element and the lead screw element, for driving the lead screw element to rotate under the action of the motor element; and / or At least one first bearing element, the first bearing element being disposed on the first rotating seat element and rotatably connected to the lead screw element, for assisting the rotation of the lead screw element; and / or At least one second bearing element, the second bearing element being disposed on the second rotating seat element and rotatably connected to the lead screw element, for assisting the rotation of the lead screw element; and / or At least one padding element is disposed at the end of the lead screw element; At least one locking nut element, the locking nut element being connected to the lead screw element and abutting against the gasket element; and / or The mounting bracket element is disposed at the end of the rigid mounting module and connected to the motor element.

4. The liquid level detection device according to claim 1, characterized in that, The constant force preload module includes: Mounting base element, the mounting base element is disposed on the longitudinal moving module, and is used to reciprocate in the vertical direction under the action of the longitudinal moving module; A push rod element is movably disposed on the side of the mounting base element and connected to the multi-axial adjustment module; A guide cylinder element, which is connected to the mounting base element and movably connected to the push rod element, is used to allow the push rod element to move along the guide cylinder element; A spring element is disposed between the push rod element and the guide cylinder element to define the relative position of the push rod element and the guide cylinder element; The first universal ball joint element is disposed at the end of the push rod element and is movably connected to the multi-axial adjustment module.

5. The liquid level detecting apparatus according to claim 4, wherein The push rod element includes: The first top rod is movably disposed on the side of the mounting base element and movably connected to the guide cylinder element; A second push rod is disposed at the end of the first push rod. The end of the second push rod is provided with the first universal ball joint element and is movably connected to the guide cylinder element. The outer diameter of the second push rod is smaller than the outer diameter of the first push rod; and / or The first universal ball joint component includes: A first support rod is disposed at the end of the top rod element; The first ball joint is disposed at the end of the first support rod and is movably connected to the multi-axial adjustment module.

6. The liquid level detecting apparatus according to claim 1, wherein The multi-axial adjustment module includes: Universal base element, wherein the universal base element is disposed between the constant force preload module and the ultrasonic module; The first universal ball joint element is disposed at the first end of the universal base element and is movably connected to the constant force preload module. The second universal ball joint element is disposed at the second end of the universal base element and is movably connected to the ultrasonic module.

7. The liquid level detecting apparatus according to claim 1, wherein The ultrasonic module includes: Fixed base components; An ultrasonic transmitting element, wherein the ultrasonic transmitting element and the fixed base element are used to follow the fixed base element in three-dimensional space and to emit ultrasonic signals; An ultrasonic receiving element is disposed on the fixed base element and is used to follow the fixed base element in three-dimensional space and to receive ultrasonic signals. A protective cover element, which is connected to the fixed base element; A coupling cover element, wherein the coupling cover element is disposed on the protective cover element; The second universal ball joint element is disposed on the side of the fixed base element and is movably connected to the multi-axial adjustment module. It is used to follow the multi-axial adjustment module to drive the fixed base element to move in the vertical and / or horizontal direction, and to drive the fixed base element to move in three-dimensional space under the action of the multi-axial adjustment module.

8. The liquid level detecting apparatus according to claim 7, wherein The second universal ball joint component includes: The second support rod is disposed on the side of the fixed base element; The second ball joint is disposed at the end of the second support rod and is movably connected to the multi-axial adjustment module.

9. The liquid level detection device according to any one of claims 1 to 8, characterized in that, Also includes: The main control module is communicatively connected to the longitudinal movement module and the ultrasonic module.

10. A gas special apparatus characterized by, include: Main framework; The liquid level detection device as described in any one of claims 1 to 9, wherein the liquid level detection device is mounted on the main frame.

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