Device for measuring liquid level and temperature gradient in liquid nitrogen biological container

Abstract

The utility model relates to the technical field of device calibration, in particular to a liquid level and temperature gradient measuring device for a liquid nitrogen biological container, which is provided with a measuring device positioned in an inner cavity of the liquid nitrogen biological container, a host positioned at the top end and a computer in wireless communication connection with the host, a measuring device comprising an ultralow-temperature steel outer shell is vertically placed in an inner cavity of the liquid nitrogen biological container, an adjusting support is vertically installed in the inner cavity of the outer shell, a plurality of temperature sensors are adjusted to be evenly distributed at preset positions along the adjusting support through an adjusting and controlling device, and temperature data of a temperature sensor array in the container can be accurately collected; an intelligent power management module, an Internet of Things communication module, a self-calibration and fault diagnosis module and an edge calculation data processing module are arranged in a host, wherein the edge calculation data processing module is used for accurately calculating the liquid level height in the liquid nitrogen biological container through a temperature gradient calculated in real time; high-precision measurement, intelligent analysis and remote monitoring of the temperature and the liquid level in the liquid nitrogen biological container can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of medical equipment calibration technology, and in particular to a liquid nitrogen biological container liquid level and temperature gradient measuring device. Background Technology

[0002] Life science and medical research cannot be separated from biological samples, and liquid nitrogen biocontainers are an important carrier for the preservation of biological resources. They are institutions that collect, process, store, and manage various biological samples, such as human organs, tissues, cells, blood, body fluids, secretions, excretions, and their biological macromolecular derivatives, as well as information on the clinical diagnosis, treatment, and follow-up of biological sample donors in a standardized manner.

[0003] With the increasing awareness of biosafety in my country, the market demand and usage of liquid nitrogen bioreactors have grown rapidly. Liquid nitrogen bioreactors use liquid nitrogen as a cold source and require sufficient storage to ensure that the temperature distribution of the internal gas phase cryopreservation section meets the requirements for sample cryopreservation. Generally, these devices are equipped with liquid level monitoring devices to monitor the liquid nitrogen level. However, with use and long-term performance drift under low-temperature conditions, the monitoring results may have significant deviations. Traditional liquid nitrogen measurement methods mainly use liquid level gauges, which have large errors and cannot be accurately calibrated. In order to meet the increasing complexity and accuracy requirements of biological resources in application fields, while ensuring the integrity and validity of biological samples, there is an urgent need for a high-precision measurement device for the internal temperature and liquid level of liquid nitrogen bioreactors. Utility Model Content

[0004] This utility model discloses a liquid level and temperature gradient measuring device in a liquid nitrogen biological container, which aims to solve the technical problems existing in the prior art.

[0005] The present invention adopts the following technical solution:

[0006] A liquid nitrogen bioreactor measuring device for measuring liquid level and temperature gradient includes a measuring device connected to the inner cavity of the liquid nitrogen bioreactor, a main unit located at the top of the liquid nitrogen bioreactor, and an external control device connected to the main unit via Internet of Things (IoT) communication; wherein,

[0007] The measuring device includes an adjustment bracket vertically installed in the inner cavity of the liquid nitrogen biological container, a plurality of measuring units evenly distributed on the adjustment bracket, and a control device for adjusting the measuring units to a preset position.

[0008] The host includes a control unit for controlling the measuring device to execute instructions, and the control unit is connected to the external control device.

[0009] In some embodiments, the measuring device further includes an outer shell made of cryogenic steel, the outer shell having an inner cavity for housing the adjusting bracket, the measuring unit and the control device, the inner cavity having an upper opening at the top, the upper opening being located at the upper opening of the liquid nitrogen biological container.

[0010] In some embodiments, the adjustment bracket is provided with a bracket that stands upright in the inner cavity of the housing, and a spatial channel in the middle of the bracket is provided with a plurality of evenly distributed measuring units inserted therein. Both sides of the spatial channel are provided with soft layers, so that when an external force is applied, the measuring units can move up and down along the spatial channel.

[0011] In some embodiments, the measuring unit includes a clamping element and a temperature sensor that are fixedly inserted into each other and have their central axes coincident; the clamping element includes a polygonal cap end and a clamping part, the polygonal cap end is attached to the vertical plane of the bracket, the clamping part passes horizontally through the spatial channel, and the temperature sensor located at the end contacts the outer shell to form a longitudinal array of temperature sensors.

[0012] In some embodiments, the control device includes a ceramic track placed vertically alongside the bracket, an adjustment element that matches and engages with the measuring unit, and a miniature electric push rod that pushes the adjustment element to slide along the track to move the measuring unit to a preset position.

[0013] In some embodiments, the adjusting element includes a sliding block, a movable slider that can slide horizontally along a tactile paving chamber provided within the sliding block, and a spring connecting the movable slider to the sliding block. The spring is electrically connected to a power module provided in the main unit, such that when power is applied, the spring contracts to pull the movable slider into the tactile paving chamber, and when power is de-energized, the spring resets and moves the movable slider to a preset position.

[0014] In some embodiments, the movable slider has an adapter port on the side facing the measuring unit, and the adapter port is clearance-fitted with the polygonal cap end shape.

[0015] In some embodiments, the miniature electric actuator includes a motor and an actuator, the end of the actuator being fixedly connected to the sliding block, and the motor being mounted on top of the liquid nitrogen biological container.

[0016] In some embodiments, the control unit is installed in the inner cavity of the main unit housing. The control unit includes an intelligent power management module with a lithium battery pack, an IoT communication module that uploads measurement data to the external control device in real time, a self-calibration and fault diagnosis module that automatically calibrates the temperature sensor periodically, and an edge computing data processing module that accurately calculates the liquid level in the liquid nitrogen biological container based on the real-time calculated temperature gradient. The external control device includes a computer.

[0017] In some embodiments, the lithium battery pack is connected to each of the temperature sensors and the motor via cables; the motor and the edge computing data processing module are both connected to the external control device via the Internet of Things communication module.

[0018] Beneficial effects:

[0019] This utility model discloses a device for measuring liquid level and temperature gradient inside a liquid nitrogen biological container. Compared with the prior art, this utility model has the following advantages:

[0020] A liquid nitrogen bioreactor's internal liquid level and temperature gradient measuring device comprises a measuring device located within the inner cavity of the liquid nitrogen bioreactor, a host computer located at the top of the liquid nitrogen bioreactor, and a computer wirelessly connected to the host computer. The measuring device, with an ultra-low temperature steel outer shell, is vertically placed within the inner cavity of the liquid nitrogen bioreactor. The measuring device includes an adjustment bracket vertically installed within the inner cavity of the outer shell and a control device for adjusting several temperature sensors to preset positions along the adjustment bracket. This allows for precise acquisition of temperature data at different heights within the container. The host computer contains a control unit that controls the measuring device according to instructions. This control unit includes an intelligent power management module, an IoT communication module, a self-calibration and fault diagnosis module, and an edge computing data processing module that accurately calculates the liquid level height within the liquid nitrogen bioreactor based on the real-time calculated temperature gradient. This enables high-precision measurement, intelligent analysis, and remote monitoring of the internal temperature and liquid level of the liquid nitrogen bioreactor. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below, constituting a part of this utility model. The illustrative embodiments of this utility model and their descriptions explain this utility model and do not constitute an improper limitation of this utility model; in the drawings:

[0022] Figure 1 This is a schematic diagram of the technical solution of the liquid level and temperature gradient measuring device in the liquid nitrogen biological container disclosed in this utility model embodiment;

[0023] Figure 2 A schematic diagram of the technical solution for connecting the host and the measuring device;

[0024] Figure 3 for Figure 2 View from direction B;

[0025] Figure 4 for Figure 2 EE cross-sectional view (when the adapter port matches and engages with the polygonal cap end);

[0026] Figure 5 A schematic diagram of the technical solution for matching and engaging the adapter port of the movable slider with the polygonal cap end of the clamping element;

[0027] Figure 6 for Figure 5 AA section view;

[0028] Figure 7 This is a schematic diagram of the technical structure of the measurement unit;

[0029] Figure 8 for Figure 7 M-direction view;

[0030] Figure 9 This is a schematic diagram of the technical solution structure of the control unit.

[0031] In the diagram: Main unit 1; Main unit housing 11; Control unit 12; Intelligent power management module 121; Lithium battery pack 1211; Plug 1212; Internet of Things communication module 123; Self-calibration and fault diagnosis module 124; Edge computing data processing module 125; Measuring device 2; Outer housing 21; Inner cavity of housing 211; Top opening 212; Bottom wall 213; Measuring unit 22; Temperature sensor 221; Clamping element 222; Polygonal cap end 2221; Clamping part 2222; Inner cavity 2 223; Through hole 2224; Adjustable bracket 23; Bracket 231; Spatial channel 232; Rubber soft layer 233; Control device 24; Miniature electric push rod 241; Motor 2411; Push rod 2412; Adjustable element 242; Sliding block 2421; Tactile paving chamber 2422; Spring 2423; Movable slider 2424; Adapter port 24241; Track 243; Liquid nitrogen biological container 3; Inner chamber 31; Upper port 32; Top partition 33; Liquid nitrogen 4; Computer 5; Cable 6. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. In the description of this utility model, it should be noted that the term "comprising" mentioned in the specification and claims is an open-ended term and should therefore be interpreted as "including but not limited to".

[0033] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments; based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] like Figures 1-9 As shown, the technical solution disclosed in this utility model is as follows:

[0036] A liquid nitrogen bioreactor's liquid level and temperature gradient measuring device includes a measuring device 2 connected to the inner chamber 31 of the liquid nitrogen bioreactor 3, a main unit 1 located at the top of the liquid nitrogen bioreactor 3, and an external control device connected to the main unit 1 via Internet of Things (IoT) communication.

[0037] The measuring device 2 includes an adjustment bracket 23 vertically installed in the inner chamber 31 of the liquid nitrogen biological container 3, a plurality of measuring units 22 evenly distributed on the adjustment bracket 23, and a control device 24 for adjusting the measuring units 22 to a preset position.

[0038] The host 1 includes a control unit 12 for controlling the measuring device 22 to execute instructions. The control unit 12 is connected to the external control device, which includes a computer 5.

[0039] like Figures 1-9 As shown, the preferred embodiment of this utility model is as follows:

[0040] A liquid nitrogen biological container liquid level and temperature gradient measuring device includes a measuring device 2 connected to the inner chamber 31 of the liquid nitrogen biological container 3, a host 1 located at the top of the liquid nitrogen biological container 3, and an external control device connected to the host 1 via Internet of Things communication. The external control device includes a computer, a smartphone, etc. In this embodiment, a computer 5 is selected.

[0041] The measuring device 2 includes an outer shell 21 made of ultra-low temperature steel, which can realize measurement in an ultra-low temperature environment of -196℃; the outer shell 21 has an inner cavity 211 and an upper opening 212 at the upper end; an adjusting bracket 23 is vertically installed in the inner cavity 211, a number of measuring units 22 are evenly distributed on the adjusting bracket 23, and a control device 24 for adjusting the measuring units 22 to a preset position. The bottom of the adjusting bracket 23 and the track 243 are firmly abutted against the bottom wall 213 of the outer shell 21, and the bottom wall 213 of the measuring device 2 is firmly abutted against the bottom wall of the liquid nitrogen biological container 3.

[0042] The adjusting bracket 23 is provided with a bracket 231 that stands upright in the inner cavity 211 of the housing. A vertical spatial channel 232 is provided in the middle of the bracket 231. Both sides of the spatial channel 232 are wrapped with a soft layer. In this embodiment, the soft layer is a rubber soft layer 233. The spacing S of the spatial channels 232 is smaller than the outer diameter of the matching measuring unit 22, so that several measuring units 22 are horizontally and evenly distributed in the spatial channels 232, i.e., the measuring units 22 are arranged vertically in an array. Under the action of external force, the measuring units 22 can move up and down along the spatial channel 232. When the external force is removed, the measuring units 22 are in a stationary state. Figure 3 As shown.

[0043] The measuring unit 22 includes a clamping element 222 and a temperature sensor 221 that are fixedly inserted into each other and have their central axes coincident. The clamping element 222 includes a polygonal cap end 2221 and a clamping part 2222. An inner cavity 2223 is provided on the central axis of the clamping part 2222. A temperature probe is inserted into the inner cavity 2223. The temperature sensor 221 of the temperature probe is located at the outer end and is in contact with the metal outer shell 21. It is used to measure the temperature in the inner chamber 31 of the liquid nitrogen biological container 3. The end face of the polygonal cap end 2221 is attached to the plane of the support 231. The clamping part 2222 passes horizontally through the space channel 232 to form a longitudinal array of temperature sensors 221. The outer periphery of the polygonal cap end 2221 can be set with polygons as needed. In this embodiment, the polygonal cap end 2221 is a quadrilateral cap end. In this embodiment, a low-temperature resistant platinum resistance temperature sensor is selected. The platinum resistance temperature sensor has the characteristics of high accuracy and high stability in the temperature range of -196℃ to 0℃ and can accurately collect temperature data at different height positions inside the container. The surface of the temperature sensor array is coated with a superhydrophobic, low thermal conductivity nano-coating to reduce the interference of liquid nitrogen 4 on the temperature sensor 221 and further improve the measurement accuracy. In addition, each platinum resistance temperature sensor 221 is equipped with an independent temperature compensation circuit, which compensates and corrects the measurement data by monitoring the sensor's own temperature in real time, eliminating measurement errors caused by factors such as the sensor's own heating.

[0044] The clamping element 222 also has a through hole 2224 on its central axis. The through hole 2224 is connected to the inner cavity 2223. All the temperature sensors 221 are electrically connected to the host 1 via the through hole 2224 by cables 6. Figure 2 , Figure 7 , Figure 8 As shown.

[0045] The control device 24 includes a ceramic track 243 placed vertically alongside the bracket 231, an adjustment element 242 that matches and engages with the measuring unit 22, and a miniature electric push rod 241 that pushes the adjustment element 242 to slide along the track 243 to move the measuring unit 22 to a preset position.

[0046] The adjusting element 242 includes a sliding block 2421, a movable slider 2424 that can slide horizontally along a tactile paving chamber 2422 provided within the sliding block 2421, and a spring 2423 connecting the movable slider 2424 to the sliding block 2421. The spring 2423 is electrically connected to an intelligent power management module 121 provided in the host unit 1 via a cable 6. The movable slider 2424 has an adapter port 24241 on the side facing the measuring unit 22. The adapter port 24241 matches the outer peripheral shape of the polygonal cap end 2221 and is in clearance fit, allowing the polygonal cap end 2221 to slide horizontally within the adapter port 24241. Figures 4-8 As shown.

[0047] When energized, the spring 2423 contracts, pulling the movable slider 2424 into the tactile paving chamber 2422. At this time, the movable slider 2424 disengages from the polygonal cap end 2221 of the clamping element 222. Figure 5 As shown; when the power is off, the spring 2423 resets, causing the movable slider 2424 to pop out and move to a preset position. At this time, the adapter port 24241 of the movable slider 2424 extends into the preset position outside the polygonal cap end 2221, that is, when the horizontal length of the movable slider 2424 inside the tactile paving chamber 2422 is H, in this embodiment, H is selected as 1 / 2 of the horizontal length L of the movable slider 2424. When the miniature electric push rod 241 pushes, the sliding block 2421 drives all the movable sliders 2424 to move up and down one by one. At the same time, the movable sliders 2424 also drive the clamping element 222 to move up and down to the preset position, so that the spacing layout of the temperature sensor 221 is adapted to liquid nitrogen biological containers 3 of different specifications to meet diverse measurement accuracy requirements, such as Figure 2 , Figure 4 As shown.

[0048] The miniature electric actuator 241 includes a motor 2411 and a actuator 2412 made of 304 stainless steel. The 304 stainless steel material ensures corrosion resistance and mechanical strength in low-temperature environments. The internal transmission components are made of ceramic material, which has a low coefficient of friction, high hardness, and good low-temperature resistance. The motor 2411 is connected to the computer 5 through the Internet of Things communication module 123, receives and executes the instructions transmitted by the computer 5, and controls the displacement of the actuator 2412 to ensure that the actuator 2412 stably and accurately adjusts the spacing of the temperature sensor 221.

[0049] The motor 2411 is mounted on the top of the liquid nitrogen biological container 3. The end of the push rod 2412 is fixedly connected to the sliding block 2421, and the sliding block 2421 slides up and down along the track 243. Figure 2 As shown.

[0050] The host 1 includes a control unit 12 for controlling the measuring device 22 to execute instructions. The control unit 12 is installed in the inner cavity of the host housing 11. The control unit 12 includes an intelligent power management module 121, an Internet of Things communication module 123, a self-calibration and fault diagnosis module 124, and an edge computing data processing module 125.

[0051] The liquid nitrogen biological container 3 has an inner chamber 31, which contains liquid nitrogen 4. An upper port 32 is located at the top of the upper port 32, and a top partition 33 is placed on top of the upper port 32. The main housing 11 is mounted on the top partition 33. The intelligent power management module 121, the IoT communication module 123, the self-calibration and fault diagnosis module 124, and the edge computing data processing module 125 are electrically connected to each temperature sensor 221 via cables 6. Figure 1 , Figure 9 As shown.

[0052] The intelligent power management module 121 is powered by a lithium battery pack 1211 with excellent low-temperature performance. A power cord and plug 1212 are fixed at the top, allowing for both plug-in and charging operation. This combination of lithium battery pack and direct power supply ensures stable power supply, while a low-power mode guarantees continuous operation under special circumstances. The intelligent power management module 121 monitors the lithium battery pack 1211's charge, voltage, and temperature in real time. By optimizing charging strategies and power distribution algorithms, it extends the battery pack 1211's lifespan and automatically switches to a low-power mode when the charge is low, ensuring the normal operation of critical functions. The lithium battery pack 1211 is powered via cable 6 to the IoT communication module 123, the self-calibration and fault diagnosis module 124, the edge computing data processing module 125, the motor 2411, and all temperature sensors 221.

[0053] The IoT communication module 123 integrates 5G and Bluetooth communication modules, allowing for the selection of appropriate communication methods based on the usage scenario. It can upload measurement data to the computer 5 in real time, enabling managers to remotely view the temperature and liquid level data of the liquid nitrogen biological container 3 via the computer 5 or a mobile APP management platform, and perform operations such as data analysis, early warning settings, and historical data queries. The multiple communication methods and remote management functions of the IoT communication module 123 enable managers to obtain information about the liquid nitrogen biological container anytime, anywhere, achieving remote monitoring and intelligent management. At the same time, the IoT communication module 123 supports remote firmware upgrades, facilitating convenient updates and optimizations of the device's software.

[0054] The self-calibration and fault diagnosis module 124 is equipped with a self-calibration system and a fault diagnosis system, connected to the temperature sensors 221. It periodically performs automatic calibration on all temperature sensors 221. The self-calibration system automatically adjusts the measurement parameters of the temperature sensors by comparing them with a built-in high-precision standard temperature source, ensuring measurement accuracy. In addition, the device also has a fault diagnosis function. By monitoring the working status of each component and data transmission in real time, when problems such as temperature sensor 221 malfunction, communication abnormalities, or power failures are detected, it automatically locates the fault and issues an alarm. The fault information is then uploaded to the computer 5 via the IoT communication module 123 for display, facilitating timely handling by maintenance personnel. This ensures the long-term accuracy of the temperature sensors 221 and the stable operation of the device, reducing manual maintenance costs and equipment failure risks.

[0055] The edge computing data processing module 125 adopts a high-performance edge computing chip and has a built-in deep learning algorithm model. This module is connected to the temperature sensor array through a low-loss, anti-interference coaxial cable 6 and is used to receive temperature data collected by the temperature sensor 221.

[0056] The edge computing data processing module 125 first performs noise reduction and filtering preprocessing on the raw temperature data, and then uses deep learning algorithms to extract and analyze the features of the temperature distribution data to quickly calculate the temperature distribution gradient. Through the established temperature-liquid level relationship model based on neural networks, combined with historical data and real-time temperature gradient, the liquid level height in the liquid nitrogen biological container 3 is accurately calculated, and the data is uploaded to the computer 5 via the IoT communication module 123. In addition, the edge computing data processing module 125 also has data caching and local analysis functions, which can still process and store data when the network is interrupted, and automatically upload the data after the network is restored. Since this part is existing technology, it will not be described in detail here.

[0057] The edge computing data processing module 125 utilizes deep learning algorithms, which can process temperature data more quickly and accurately than traditional algorithms, calculate temperature gradients and liquid level heights, and also has local processing and data caching functions, enhancing the reliability and independence of the device.

[0058] Implementation process:

[0059] Based on the specifications and measurement requirements of the liquid nitrogen biocontainer 3, the spacing and layout of the temperature sensor array 221 on the adjustment bracket 23 are adjusted by the control device 24, fixing it vertically inside the liquid nitrogen biocontainer 3. The intelligent power management module 121 supplies power to all components. The temperature sensor array begins to collect temperature data at different heights inside the liquid nitrogen biocontainer 3 in real time and transmits the data to the edge computing data processing module 125 via the coaxial cable 6. The data is preprocessed and analyzed using deep learning to calculate the temperature distribution gradient and liquid level. The IoT communication module 123 uploads the measurement data to the computer 5, allowing administrators to remotely view the data via the computer 5 management platform or a mobile app. During operation, the self-calibration system of the self-calibration and fault diagnosis module 124 automatically calibrates the temperature sensors 221 periodically, and the fault diagnosis module monitors the working status of each component in real time to ensure the normal operation of the device.

[0060] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A device for measuring liquid level and temperature gradient in a liquid nitrogen biological container, characterized in that: It includes a measuring device located inside the liquid nitrogen biocontainer, a main unit located at the top of the liquid nitrogen biocontainer, and an external control device connected to the main unit via Internet of Things (IoT) communication; wherein, The measuring device includes an adjustment bracket vertically installed in the inner cavity of the liquid nitrogen biological container, a plurality of measuring units evenly distributed on the adjustment bracket, and a control device for adjusting the measuring units to a preset position. The host includes a control unit for controlling the measuring device to execute instructions, and the control unit is connected to the external control device.

2. The liquid level and temperature gradient measuring device in a liquid nitrogen biological container according to claim 1, characterized in that: The measuring device also includes an outer shell made of ultra-low temperature steel. The outer shell has an inner cavity for housing the adjustment bracket, the measuring unit and the control device. The top of the inner cavity has an upper opening, which is located at the upper opening of the liquid nitrogen biological container.

3. The liquid level and temperature gradient measuring device in a liquid nitrogen biological container according to claim 2, characterized in that: The adjustment bracket is provided with a support that stands upright in the inner cavity of the housing. The middle of the support is provided with a spatial channel in which several evenly distributed measuring units are inserted. Both sides of the spatial channel are provided with soft layers so that when an external force is applied, the measuring units can move up and down along the spatial channel.

4. The liquid level and temperature gradient measuring device in a liquid nitrogen biological container according to claim 3, characterized in that: The measuring unit includes a clamping element and a temperature sensor that are fixedly inserted into each other and have their central axes coincident; the clamping element includes a polygonal cap end and a clamping part, the polygonal cap end is attached to the vertical plane of the bracket, the clamping part passes horizontally through the spatial channel, and the temperature sensor located at the end contacts the outer shell to form a longitudinal array of temperature sensors.

5. The liquid level and temperature gradient measuring device in a liquid nitrogen biological container according to claim 4, characterized in that: The control device includes a ceramic track placed vertically alongside the bracket, an adjustment element that matches and engages with the measuring unit, and a miniature electric push rod that pushes the adjustment element to slide along the track to move the measuring unit to a preset position.

6. The liquid level and temperature gradient measuring device in a liquid nitrogen biological container according to claim 5, characterized in that: The adjusting element includes a sliding block, a movable slider that can slide horizontally along a tactile paving chamber provided inside the sliding block, and a spring connecting the movable slider to the sliding block. The spring is electrically connected to a power module provided in the main unit, so that when power is applied, the spring contracts to pull the movable slider into the tactile paving chamber, and when power is de-energized, the spring resets and moves the movable slider to a preset position.

7. The liquid level and temperature gradient measuring device in a liquid nitrogen biological container according to claim 6, characterized in that: The movable slider has an adapter port on the side facing the measuring unit, and the adapter port is clearance-fitted with the polygonal cap end.

8. The liquid level and temperature gradient measuring device in a liquid nitrogen biological container according to claim 6, characterized in that: The miniature electric actuator includes a motor and an actuator, the end of which is fixedly connected to the sliding block, and the motor is mounted on the top of the liquid nitrogen biological container.

9. The liquid level and temperature gradient measuring device in a liquid nitrogen biological container according to claim 8, characterized in that: The control unit is installed in the inner cavity of the main unit housing. The control unit includes an intelligent power management module with a lithium battery pack, an Internet of Things communication module that uploads measurement data to the external control device in real time, a self-calibration and fault diagnosis module that automatically calibrates the temperature sensor periodically, and an edge computing data processing module that accurately calculates the liquid level in the liquid nitrogen biological container based on the real-time calculated temperature gradient. The external control device includes a computer.

10. The liquid level and temperature gradient measuring device in a liquid nitrogen biological container according to claim 9, characterized in that: The lithium battery pack is connected to each of the temperature sensors and the motor via cables; the motor and the edge computing data processing module are both connected to the external control device via the Internet of Things communication module.

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