Distributed zero-position tank liquid level automatic control method and system

Abstract

The invention belongs to the technical field of liquid asphalt storage equipment, and particularly relates to a distributed zero-position groove liquid level automatic control method and system, liquid level data is collected in real time and compared with an alarm threshold value, an over-limit zero-position groove is marked as a risk groove, and the over-limit zero-position groove is marked as an input groove or an output groove according to the liquid level change trend of the risk groove; aiming at the input tank, determining an adjusting liquid level value to screen and adjust the exchange tank, and cooperatively supplementing asphalt to the input tank; according to the method, automatic accurate classification of liquid level abnormity is achieved, a stable liquid level balance mechanism is constructed through multi-tank cooperation and safety check, and by means of critical liquid level check and directional supplement, the operation reliability and the resource allocation efficiency are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of liquid asphalt storage equipment, and in particular relates to a distributed zero-level tank liquid level automatic control method and system. Background Art

[0002] Asphalt is an indispensable key material in fields such as highway construction and waterproofing projects. Its physical properties play a decisive role in project quality and construction efficiency. To ensure that the asphalt has good fluidity and adhesion, it is usually necessary to heat it to a liquid state and maintain it in a specific temperature range.

[0003] Existing asphalt heating and level control technologies suffer from numerous inherent flaws, making them incapable of meeting the demands of modern, intelligent production. Traditional methods often employ simple upper-limit level alarm mechanisms, which are inherently passive and delayed, relying heavily on timely operator response and manual intervention. If personnel fail to promptly address these issues, the gases generated by continued heating can accumulate due to excessively high levels, potentially leading to excessive pressure within the sealed container and posing a serious explosion risk, threatening personnel and equipment safety. Regarding equipment maintenance and operational efficiency, existing control logic is overly simplistic. When asphalt cannot be promptly discharged and the level remains elevated, the lack of an automatic adjustment mechanism can lead to localized overheating, resulting in coking and deterioration of the asphalt, impacting product quality. Asphalt can also adhere to heating equipment surfaces, reducing heat transfer efficiency, shortening equipment life, and increasing energy consumption and maintenance costs. Furthermore, existing technologies lack intelligent closed-loop control capabilities, preventing coordinated regulation of level, temperature, and feed and discharge rates. Consequently, the overall system suffers from poor robustness and struggles to adapt to dynamic changes under varying operating conditions, impacting the efficiency and stability of the production process. Summary of the Invention

[0004] The present invention provides a distributed zero-level tank liquid level automatic control method to solve the problem in the prior art that liquid asphalt cannot be adjusted quickly, thus posing certain safety hazards.

[0005] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows: A distributed zero tank liquid level automatic control method comprises the following steps: Obtain the number of multiple distributed zero-level slots, configure the liquid level detection system, and collect liquid level data in real time; According to the real-time liquid level data, the zero-level slot is marked as a risk slot, and the real-time liquid level change trend of the risk slot is determined. When the real-time liquid level change trend is a liquid level increase, the risk slot is calibrated as an input slot. When the real-time liquid level change trend is a liquid level decrease, the risk slot is calibrated as an output slot. When an input slot exists, its real-time liquid level fluctuation within a preset time period is analyzed, and the maximum variation range of the real-time liquid level fluctuation is determined. Based on the maximum variation range, the adjustment tolerance is determined. Based on the current liquid level data of the input slot and the adjustment tolerance, the adjustment level value is calculated and set. Collect the current liquid level data of the remaining zero-level tanks except the input tank, compare the current liquid level data of the remaining zero-level tanks with the adjusted liquid level value, and when the current liquid level data of a certain zero-level tank is less than the adjusted liquid level value, set the zero-level tank as an adjusted exchange tank, calculate the total amount of liquid asphalt required for the input tank to recover to the target liquid level, distribute the total amount of liquid asphalt equally to each adjusted exchange tank, and control the adjusted exchange tank to replenish liquid asphalt to the input tank; when the risk tank is calibrated as an output tank, identify the tank to be replaced that needs to be stopped and replenished, control the output tank, and transport the liquid asphalt in it to the tank to be replaced.

[0006] Preferably, a unique number is assigned to each zero position slot, and a liquid level detection system is used to detect and record the initial liquid level, and an alarm threshold is set for each zero position slot based on the preset operating parameters of the zero position slot; The real-time liquid level data is compared with the alarm threshold corresponding to the zero-level slot. When the real-time liquid level data is greater than the alarm threshold, the zero-level slot is marked as a risk slot.

[0007] Preferably, the liquid level detection system includes a hydraulic sensor, and further includes using the hydraulic sensor to detect and record the liquid level pressure information in each zero position tank, and converting the real-time liquid level data based on the liquid level pressure information and the pre-stored structural parameters of the zero position tank.

[0008] Preferably, the step of determining the real-time liquid level change trend of the risk tank includes collecting liquid level data of the risk tank at multiple consecutive time points to form a liquid level data sequence, and calculating the liquid level change slope on the time series based on the liquid level data sequence. When the liquid level change slope is a positive value, the real-time liquid level change trend is determined to be a rising liquid level; when the liquid level change slope is a negative value, the real-time liquid level change trend is determined to be a falling liquid level.

[0009] Preferably, before judging the real-time liquid level change trend, the process also includes a step of obtaining the preset critical liquid level of the risk tank and judging whether the real-time liquid level data of the risk tank is greater than the critical liquid level. If so, the step of judging the real-time liquid level change trend is executed. If not, an alarm signal is triggered and the transportation of liquid asphalt to the remaining zero-level tanks is stopped.

[0010] Preferably, the step of setting the adjusted liquid level value includes subtracting the adjustment tolerance from the current liquid level data of the input tank to obtain the adjusted liquid level value.

[0011] Preferably, before controlling the regulating exchange tank to replenish liquid asphalt to the input tank, it also includes obtaining the safety reserve capacity of each regulating exchange tank, and judging whether the replenishment task equally distributed to each regulating exchange tank will cause the liquid level of the regulating exchange tank to be lower than its safety reserve capacity. If so, the replenishment task is reallocated to the remaining regulating exchange tanks that meet the safety reserve capacity.

[0012] Preferably, the tank to be replaced is marked as a consumable tank, the liquid asphalt consumption of the consumable tank in a unit time period is counted, a preset rated safety period is obtained, and it is determined whether the cumulative operating time of the consumable tank reaches the rated safety period; If not, the mark of the consumption tank is maintained and the liquid asphalt replenishment operation of the consumption tank is delayed; If it is reached, the mark of the consumption tank is reset to restore it to a zero-level tank that can participate in liquid level control.

[0013] The present invention also provides a distributed zero tank liquid level automatic control system for implementing the above-mentioned distributed zero tank liquid level automatic control method, comprising: A configuration module assigns a unique number to each of the multiple distributed zero position slots, records the initial liquid level of each zero position slot, and is configured in a liquid level detection system for each zero position slot; A threshold setting module sets an alarm threshold for each zero position slot according to the preset operating parameters of the zero position slot; The risk identification module uses the liquid level detection system to collect the real-time liquid level data of each zero-level slot in real time, compares the real-time liquid level data with the alarm threshold corresponding to the zero-level slot, and marks the zero-level slot as a risk slot when the real-time liquid level data is greater than the alarm threshold; The direction calibration module determines the real-time liquid level change trend of the risk tank. When the real-time liquid level change trend is rising, the risk tank is calibrated as an input tank. When the real-time liquid level change trend is falling, the risk tank is calibrated as an output tank. The exchange tank identification module determines the adjustment tolerance and sets the adjustment liquid level value for the input tank, collects the current liquid level data of the zero-level tanks other than the input tank, and sets the zero-level tank whose current liquid level data is less than the adjustment liquid level value as the adjustment exchange tank; The control execution module calculates the total amount of liquid asphalt required to restore the input tank to the target liquid level, distributes the total amount of liquid asphalt equally to each regulating exchange tank, and controls the regulating exchange tank to replenish liquid asphalt to the input tank; The output switching module, when the risk tank is marked as the output tank, identifies the tank to be replaced that needs to be stopped and replenished, and controls the output tank to transport the liquid asphalt in it to the tank to be replaced. Beneficial effects

[0014] The present invention identifies risk slots by comparing real-time monitoring of liquid levels with alarm thresholds, and determines their changing trends based on the slope of change calculated based on the liquid level data sequence, thereby accurately calibrating the risk slots as "input slots" (liquid level rising) or "output slots" (liquid level falling). The present invention realizes the automated classification of liquid level anomalies, identifies the specific type of risk, and provides an accurate basis for subsequent targeted regulation. Compared with traditional single alarms, the present invention improves the intelligent level of autonomous response and processing.

[0015] The present invention determines the adjustment tolerance for the input tank based on real-time liquid level fluctuations, and screens multiple adjustment exchange tanks. When performing replenishment, the tasks are evenly distributed, and the safety reserve capacity of each adjustment exchange tank is pre-checked to prevent its liquid level from excessively decreasing. The present invention constructs a dynamic and coordinated liquid level balance mechanism, which disperses the adjustment load through multi-tank collaboration and prevents secondary risks through safety capacity checks, thereby overcoming the defect that single-point adjustment is prone to cause chain fluctuations and ensuring the stability of regulation.

[0016] The present invention adds a safety check before regulation, that is, it determines whether the liquid level in the risk tank is greater than the preset critical liquid level. If not, it will immediately alarm and terminate the operation. When processing the output tank, by identifying the tank to be replaced, the targeted replenishment of the specific tank body is realized, thereby enhancing the operational reliability. The critical liquid level check serves as a key safety line to prevent the incorrect handling of serious abnormalities, and the targeted replenishment logic ensures that the asphalt resources are accurately transported to the designated tank body, avoiding resource mismatch and improving operational efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flow chart of the distributed zero tank liquid level automatic control method of the present invention; DETAILED DESCRIPTION

[0018] Example 1

[0019] This embodiment provides a distributed zero tank liquid level automatic control method, including the following steps: Obtain the number of multiple distributed zero-position slots and assign a unique number to each zero-position slot, thereby establishing a complete zero-position slot identification and addressing system, configuring a liquid level detection system for each zero-position slot, and using the liquid level detection system to detect and record the initial liquid level of each zero-position slot as a benchmark for subsequent calculations of dynamic liquid level changes; a distributed zero-position slot refers to a network consisting of multiple interconnected liquid asphalt storage tanks, each of which can operate independently and work together under a unified control system to achieve dynamic balance of the liquid level of the entire system. The zero-position slot identification and addressing system refers to a mechanism that assigns a unique identity code to each distributed zero-position slot in the system. The system ensures that the central control system can accurately identify, monitor and instruct each independent slot.

[0020] The liquid level detection system preferably uses a hydraulic sensor. The technical advantage of using a hydraulic sensor is that it can be installed on the bottom or outside the side wall of the zero position tank without direct contact with high-temperature, high-viscosity liquid asphalt. It has the characteristics of high reliability, long life and maintenance-free, and is particularly suitable for harsh industrial environments. The method specifically includes: using a hydraulic sensor to detect and record the liquid level pressure information in each zero position tank; pre-storing the structural parameters of each zero position tank, such as the cross-sectional area inside the tank body, the design geometry, etc.; based on the measured liquid level pressure information and the pre-stored structural parameters, and combined with the density value of the liquid asphalt at the current working temperature, the real-time liquid level data is converted through the principles of fluid statics.

[0021] Based on the preset operating parameters of each zero-level tank, an alarm threshold is set for the zero-level tank. The alarm threshold is a key early warning trigger value. When the liquid level exceeds this threshold, it indicates that the liquid level of the zero-level tank has entered an abnormal state, and there may be an overflow risk or it indicates that unplanned asphalt injection is received, and the intervention procedure needs to be initiated. The preset operating parameters refer to a set of key data pre-configured for each zero-level tank, including its design capacity, safe operating range, etc. The alarm threshold and other operating benchmarks are set based on these parameters.

[0022] Through the liquid level detection system, the real-time liquid level data of each zero position slot is collected at a preset frequency. The collected data is continuously compared with the alarm threshold corresponding to the zero position slot. When the real-time liquid level data of a zero position slot is monitored to be greater than its set alarm threshold, the zero position slot is marked as a risk slot, and subsequent analysis and control logic is initiated. A risk slot refers to a zero position slot that is specially marked by the system because its real-time liquid level data has exceeded the preset alarm threshold, indicating that there is a potential operational risk in the slot body and the intervention procedure is initiated.

[0023] For the zero-level tank that has been marked as a risk tank, determine the root cause of its liquid level change. Before judging the change trend, first perform the key safety pre-check step: obtain the preset critical liquid level of the risk tank. The preset critical liquid level is a higher-level safety limit independent of the alarm threshold, representing the maximum capacity of the physical structure of the tank or the safety red line that should never be exceeded. Determine whether the real-time liquid level data of the risk tank is greater than the preset critical liquid level; if so, it indicates that the situation is urgent and overflow may be about to occur or has occurred. An alarm signal will be triggered immediately, such as an audible and visual alarm, and an emergency shutdown command will be sent to the central control room. At the same time, all liquid asphalt transportation activities between other zero-level tanks will be forced to stop to isolate the fault point and prevent the situation from escalating; if not, that is, the real-time liquid level exceeds the alarm threshold but is still below the critical liquid level, the situation is considered controllable, and the next step of real-time liquid level change trend judgment will be executed.

[0024] In order to judge the real-time liquid level change trend, the liquid level data of the risk tank is collected at multiple consecutive time points to form a liquid level data sequence. Based on the liquid level data sequence, the liquid level change slope on the time series is calculated to quantify its change trend; for example, the least squares method can be used to perform linear fitting on the data sequence to obtain the slope; when the calculated liquid level change slope is a positive value, the real-time liquid level change trend is determined to be a rising liquid level, indicating that the risk tank is receiving liquid asphalt, and the risk tank is calibrated as an input tank. When the liquid level change slope is a negative value, the real-time liquid level change trend is determined to be a falling liquid level, indicating that the risk tank is transporting liquid asphalt outward, but its initial liquid level is too high, and there is a management risk, so it is calibrated as an output tank.

[0025] Specifically, the liquid level change slope refers to a computational model used to quantify the rate and direction of liquid level change over time.

[0026] Input: In time period A series of discrete liquid level data points collected in the liquid level data sequence is expressed as a liquid level data sequence .

[0027] Output: Liquid level change slope , which represents the linear trend of liquid level change.

[0028] Mathematical formula:

[0029] This formula is a linear regression model based on the method of least squares and is used to calculate the slope of the line that fits the data points.

[0030] Where, (Liquid level change slope): Indicates the average change in liquid level per unit time. A positive value indicates a rising liquid level, a negative value indicates a falling liquid level, and a zero value indicates a stable liquid level. (number of data points): the total number of level data samples used to calculate the slope; (Timestamp): The acquisition time of each liquid level data point; (Instantaneous liquid level): at time Measured liquid level height.

[0031] When an input tank exists, in order to achieve accurate and stable liquid level regulation and avoid frequent starts and stops or overshoot during the regulation process, it is necessary to determine a reasonable regulation target, analyze the real-time liquid level fluctuations of the input tank within a preset time period, and determine the maximum variation caused by process disturbances under normal operating conditions. Based on the maximum variation, the regulation tolerance is determined, and a dynamic buffer area around the current liquid level is established to ensure that the regulation action is triggered only when the liquid level deviates significantly. When the maximum variation cannot be determined due to insufficient data or the system has just started, the regulation tolerance is set to 5% of the current liquid level data of the input tank as a reliable empirical default value.

[0032] Based on the current liquid level data of the input tank and the determined adjustment tolerance, the adjustment liquid level value is calculated and set. The specific setting steps are: subtract the adjustment tolerance from the current liquid level data of the input tank to obtain the adjustment liquid level value. This adjustment liquid level value constitutes the qualification line for the remaining zero-level tanks to participate in collaborative adjustment. The current liquid level data of all zero-level tanks except the input tank are collected, and these data are compared with the aforementioned adjustment liquid level value. When the current liquid level data of a zero-level tank is less than the adjustment liquid level value, it indicates that the liquid level of the tank is low and there is sufficient capacity to safely output asphalt without putting itself at risk of low liquid level. Therefore, the zero-level tank is set as the adjustment exchange tank.

[0033] After identifying the regulating exchange tank, the specific replenishment execution stage begins. The total amount of liquid asphalt required to restore the input tank to the target liquid level is calculated, and the total amount of liquid asphalt is evenly distributed to each regulating exchange tank as a replenishment task. The regulating exchange tank is controlled to replenish liquid asphalt to the input tank through the pipeline and valve system.

[0034] Before issuing a replenishment control instruction, a pre-check is performed to obtain the safety reserve capacity of each regulating exchange tank. This safety reserve capacity is the minimum amount of asphalt that must be retained to ensure the safe operation of the regulating exchange tank itself. The system pre-calculates whether the replenishment tasks equally distributed to each regulating exchange tank will cause the liquid level of the regulating exchange tank to fall below its safety reserve capacity. If so, the regulating exchange tank is unable to handle the currently assigned task and is removed from the current task. The replenishment task it originally assumed is then proportionally reallocated to other regulating exchange tanks that meet the safety reserve capacity requirements. When a risk tank is designated as an output tank, indicating that its liquid level has abnormally increased but is trending downward, or when its liquid level continues to rise and is designated as an input tank, it returns to normal and serves as an output source. The system identifies the tanks to be replaced that need to be stopped and replenished. These tanks require replenishment due to planned maintenance or because their liquid level has dropped to the lower limit of normal operation. The system then controls the output tanks, switches the liquid asphalt within them through pipelines, and transfers it to the tanks to be replaced, achieving efficient resource scheduling.

[0035] A consumption status mark is introduced. When the tank to be replaced is selected and starts to receive asphalt, the tank to be replaced will be marked as a consumption tank. The liquid asphalt consumption of the consumption tank in a unit time period will be counted, and its cumulative operating time as a consumption tank will be recorded to obtain the preset rated safety cycle. This cycle counts the reasonable operating time of the tank body as the main consumption unit to determine whether the cumulative operating time of the consumption tank has reached the rated safety cycle. If it has not reached the rated safety cycle, the mark of the consumption tank will be maintained, and any new liquid asphalt replenishment operation for the consumption tank will be actively delayed to avoid frequent small-dose replenishment and improve operating efficiency. When the cumulative operating time reaches the rated safety cycle, the mark of the consumption tank will be reset to restore it to the zero-level tank state that can participate in liquid level control.

[0036] Through the above method, not only can the remaining zero-level tanks be used for supplementary regulation before the liquid level in the zero-level tank reaches the alarm threshold, but the liquid flow path can also be dynamically allocated or replaced. Combined with the liquid level fluctuation law, the safety and efficiency of the entire liquid asphalt storage system at high temperature can be ensured, and the risk of overpressure, leakage or explosion caused by single-point liquid level abnormalities can be effectively prevented.

[0037] Example 2 This embodiment provides a distributed zero tank liquid level automatic control system for implementing the aforementioned distributed zero tank liquid level automatic control method, which mainly includes the following modules: A configuration module assigns a unique number to each of the multiple distributed zero position slots and records the initial liquid level of each zero position slot. Its main function is to assign an independent identifier to each distributed zero position slot and bind it to the liquid level detection system, so that all subsequent liquid level data can be accurately traced based on the number. In a preferred embodiment, this module can use hydraulic, ultrasonic, or optical sensors to build a liquid level detection system. Through periodic scanning and sampling, combined with analog and digital conversion, it can realize the recording of initial liquid level and real-time liquid level data; The threshold setting module sets the alarm threshold for each zero position tank based on its preset operating parameters. The preset operating parameters may include structural parameters such as tank size, liner structure, installation height, as well as the stress distribution, thermal expansion phenomenon and range fluctuation of asphalt under different heating cycles. The module then sets the alarm threshold that is both safe and does not affect the exchange efficiency. The risk identification module uses the liquid level detection system to collect the real-time liquid level data of each zero-level slot in real time, compares the real-time liquid level data with the alarm threshold corresponding to the zero-level slot, and marks the zero-level slot as a risk slot when the real-time liquid level data is greater than the alarm threshold; The direction calibration module determines the real-time liquid level change trend of the risk tank. When the real-time liquid level change trend is rising, the risk tank is calibrated as an input tank. When the real-time liquid level change trend is falling, the risk tank is calibrated as an output tank. This module combines the recent liquid level data snapshots with the calculated trend value and can use the moving average method or the differential method to quickly determine the trend. It also supports manual correction to improve the system's redundancy and fault tolerance. The exchange tank identification module determines the adjustment tolerance and sets the adjustment level value for the input tank. It collects the current level data of all zero-level tanks other than the input tank and designates the zero-level tank with a current level less than the adjustment level as the adjustment exchange tank. This module preferably supports logic based on reference, offset, and equalization, and through the interaction of measurement and simulation, it is not limited by traditional static volume ratios.

[0038] The control execution module calculates the total amount of liquid asphalt required to restore the input tank to the target liquid level, distributes the total amount of liquid asphalt evenly to each regulating exchange tank, and controls the regulating exchange tank to replenish liquid asphalt to the input tank. The required replenishment amount of the input tank is matched with the available capacity of the regulating exchange tank, and tanks with relatively high carrying capacity are given priority to avoid the regulating exchange tank from becoming a risk tank due to excessive replenishment. This module can use one-way valve control, electromagnetic flow regulation, or proportional execution instructions to distribute the replenishment amount to ensure smooth regulation operations. The output switching module, when the risk tank is marked as an output tank, identifies the tank to be replaced that needs to be stopped and replenished, and controls the output tank to transport the liquid asphalt inside it to the tank to be replaced. It supports the introduction of delay judgment during the switching process to determine whether it is within the rated tolerance time range, thereby controlling the safety of the switching process.

[0039] In summary, through the joint scheduling and logical processing of the above-mentioned configuration module, threshold setting module, risk identification module, direction calibration module, exchange tank identification module, control execution module and output switching module, this embodiment can monitor in real time, provide early warning, quickly adjust and efficiently allocate liquid resources during the asphalt storage and heating operation process, improve equipment safety and effectively reduce the delay risk and operational uncertainty caused by manual intervention, and ensure the continuity and reliability of the liquid asphalt storage and control process.

[0040] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A distributed zero tank liquid level automatic control method, characterized in that: The following steps are involved: Obtain the number of multiple distributed zero-level slots, configure the liquid level detection system, and collect liquid level data in real time; According to the real-time liquid level data, the zero-level slot is marked as a risk slot, and the real-time liquid level change trend of the risk slot is determined. If the real-time liquid level change trend is a liquid level increase, the risk slot is calibrated as an input slot. If the real-time liquid level change trend is a liquid level decrease, the risk slot is calibrated as an output slot. When an input slot exists, its real-time liquid level fluctuation within a preset time period is analyzed, and the maximum variation range of the real-time liquid level fluctuation is determined. Based on the maximum variation range, the adjustment tolerance is determined. Based on the current liquid level data of the input slot and the adjustment tolerance, the adjustment level value is calculated and set. Collect the current liquid level data of the remaining zero-level tanks except the input tank, compare the current liquid level data of the remaining zero-level tanks with the adjusted liquid level value, and when the current liquid level data of a certain zero-level tank is less than the adjusted liquid level value, set the zero-level tank as an adjusted exchange tank, calculate the total amount of liquid asphalt required for the input tank to recover to the target liquid level, distribute the total amount of liquid asphalt equally to each adjusted exchange tank, and control the adjusted exchange tank to replenish liquid asphalt to the input tank; when the risk tank is calibrated as an output tank, identify the tank to be replaced that needs to be stopped and replenished, control the output tank, and transport the liquid asphalt in it to the tank to be replaced.

2. A distributed zero tank liquid level automatic control method according to claim 1, characterized in that: Assign a unique number to the zero position slot, use the liquid level detection system to detect and record the initial liquid level, and set the alarm threshold for each zero position slot based on the preset operating parameters of the zero position slot; The real-time liquid level data is compared with the alarm threshold corresponding to the zero-level slot. When the real-time liquid level data is greater than the alarm threshold, the zero-level slot is marked as a risk slot.

3. A distributed zero tank liquid level automatic control method according to claim 2, characterized in that: The liquid level detection system includes a hydraulic sensor, and also uses the hydraulic sensor to detect and record the liquid level pressure information in each zero position tank, and converts the real-time liquid level data based on the liquid level pressure information and the pre-stored structural parameters of the zero position tank.

4. A distributed zero tank liquid level automatic control method according to claim 2, characterized in that: The step of determining the real-time liquid level change trend of the risk tank includes collecting the liquid level data of the risk tank at multiple consecutive time points to form a liquid level data sequence, and calculating the liquid level change slope on the time series based on the liquid level data sequence. If the liquid level change slope is a positive value, the real-time liquid level change trend is determined to be a rising liquid level; if the liquid level change slope is a negative value, the real-time liquid level change trend is determined to be a falling liquid level.

5. A distributed zero tank liquid level automatic control method according to claim 2, characterized in that: Before judging the real-time liquid level change trend, it also includes the steps of obtaining the preset critical liquid level of the risk tank and judging whether the real-time liquid level data of the risk tank is greater than the critical liquid level. If so, the step of judging the real-time liquid level change trend is executed. If not, an alarm signal is triggered and the liquid asphalt transportation to the remaining zero-level tanks is stopped.

6. A distributed zero tank liquid level automatic control method according to claim 2, characterized in that: The step of setting the adjusted liquid level value includes subtracting the adjustment tolerance from the current liquid level data of the input tank to obtain the adjusted liquid level value.

7. A distributed zero tank liquid level automatic control method according to claim 2, characterized in that: Before controlling the regulating exchange tank to replenish liquid asphalt to the input tank, it also includes obtaining the safety reserve capacity of each regulating exchange tank, and judging whether the replenishment task equally distributed to each regulating exchange tank will cause the liquid level of the regulating exchange tank to be lower than its safety reserve capacity. If so, the replenishment task is reallocated to the remaining regulating exchange tanks that meet the safety reserve capacity.

8. A distributed zero tank liquid level automatic control method according to claim 2, characterized in that: Mark the tank to be replaced as a consumable tank, count the liquid asphalt consumption of the consumable tank in a unit time period, obtain the preset rated safety period, and determine whether the cumulative operating time of the consumable tank has reached the rated safety period; If not, the mark of the consumption tank is maintained and the liquid asphalt replenishment operation of the consumption tank is delayed; If it is reached, the mark of the consumption tank is reset to restore it to a zero-level tank that can participate in liquid level control.

9. A distributed zero tank liquid level automatic control system, used to implement a distributed zero tank liquid level automatic control method according to any one of claims 1 to 8, characterized in that: include: A configuration module assigns a unique number to each of the multiple distributed zero position slots, records the initial liquid level of each zero position slot, and is configured in a liquid level detection system for each zero position slot; A threshold setting module sets an alarm threshold for each zero position slot according to the preset operating parameters of the zero position slot; The risk identification module uses the liquid level detection system to collect the real-time liquid level data of each zero-level slot in real time, compares the real-time liquid level data with the alarm threshold corresponding to the zero-level slot, and marks the zero-level slot as a risk slot when the real-time liquid level data is greater than the alarm threshold; The direction calibration module determines the real-time liquid level change trend of the risk tank. When the real-time liquid level change trend is rising, the risk tank is calibrated as an input tank. When the real-time liquid level change trend is falling, the risk tank is calibrated as an output tank. The exchange tank identification module determines the adjustment tolerance and sets the adjustment liquid level value for the input tank, collects the current liquid level data of the zero-level tanks other than the input tank, and sets the zero-level tank whose current liquid level data is less than the adjustment liquid level value as the adjustment exchange tank; The control execution module calculates the total amount of liquid asphalt required to restore the input tank to the target liquid level, distributes the total amount of liquid asphalt equally to each regulating exchange tank, and controls the regulating exchange tank to replenish liquid asphalt to the input tank; The output switching module, when the risk tank is marked as the output tank, identifies the tank to be replaced that needs to be stopped and replenished, and controls the output tank to transport the liquid asphalt in it to the tank to be replaced.

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