A distributed zero-position tank liquid level automatic control method and system

Abstract

The present application belongs to the technical field of liquid asphalt storage equipment, and particularly relates to a distributed zero-position tank liquid level automatic control method and system, which compares real-time collected liquid level data with alarm threshold values, marks the zero-position tank exceeding the limit as a risk tank, and labels it as an input tank or an output tank according to its liquid level change trend; for the input tank, the adjusted liquid level value is determined to screen and adjust the exchange tank, and asphalt is supplemented to the input tank; for the output tank, the tank to be replaced is identified and asphalt is delivered to it; the present application realizes automatic and accurate classification of liquid level abnormalities, builds a stable liquid level balance mechanism through multi-tank cooperation and safety check, and improves the reliability of operation and resource allocation efficiency with the help of critical liquid level check and directional replenishment.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of liquid asphalt storage equipment, and particularly relates to a distributed zero-position tank liquid level automatic control method and system. BACKGROUND

[0002] Asphalt is an indispensable key material in the fields of highway construction, waterproof engineering, etc., and its physical properties play a decisive role in engineering quality and construction efficiency. In order to ensure that the asphalt has good fluidity and adhesion, it is usually heated to a liquid state and maintained in a specific temperature range.

[0003] The existing asphalt heating and liquid level control technology generally has many inherent defects, and it is difficult to meet the needs of modern and intelligent production. In terms of safety, the traditional method usually adopts a simple upper limit liquid level alarm mechanism. This method is essentially a passive and lagging alarm, which highly depends on the timely response and manual intervention of the operating personnel. Once the personnel fail to handle it quickly, the gas produced by continuous heating will be accumulated due to the high liquid level, which is easy to form an ultra-high pressure in the closed container, posing a serious explosion risk and threatening the safety of personnel and equipment. In terms of equipment maintenance and operation efficiency, the existing control logic is too simple. When the asphalt cannot be discharged in time and the liquid level is continuously high, there is a lack of automatic adjustment mechanism, which may cause the local material to be overheated, resulting in asphalt coking and deterioration, affecting product quality, and also adhering to the surface of the heating equipment, reducing the heat transfer efficiency, shortening the service life of the equipment, and increasing the energy consumption and operation cost. In terms of automation, the existing technology lacks intelligent closed-loop control capability and cannot realize the coordinated adjustment among the liquid level, temperature and feeding and discharging rate. The whole system has poor robustness and is difficult to adapt to the dynamic changes under different working conditions, affecting the efficiency and stability of the production process. SUMMARY

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

[0005] To achieve the above-mentioned application purposes, the technical solutions adopted by the application are as follows:

[0006] A distributed zero-position tank liquid level automatic control method, comprising the following steps:

[0007] Obtaining the number of multiple distributed zero-position tanks, configuring a liquid level detection system, and collecting liquid level data in real time;

[0008] According to the real-time liquid level data, the zero-position tank is marked as a risk tank, the real-time liquid level change trend of the risk tank is judged, when the real-time liquid level change trend is liquid level rising, the risk tank is marked as an input tank, when the real-time liquid level change trend is liquid level falling, the risk tank is marked as an output tank; when there is an input tank, the real-time liquid level fluctuation of the input tank in a preset time period is analyzed, the maximum change amplitude of the real-time liquid level fluctuation is determined, based on the maximum change amplitude, an adjustment tolerance is determined, based on the current liquid level data of the input tank and the adjustment tolerance, an adjusted liquid level value is calculated and set;

[0009] The current liquid level data of the rest of the zero-position tanks except the input tank is collected, the current liquid level data of the rest of the zero-position tanks is compared with the adjusted liquid level value, when the current liquid level data of a certain zero-position tank is less than the adjusted liquid level value, the zero-position tank is set as an adjustment exchange tank, the total amount of liquid asphalt required for the input tank to recover to the target liquid level is calculated, the total amount of liquid asphalt is equally distributed to each adjustment exchange tank, and the adjustment exchange tank is controlled to supplement liquid asphalt to the input tank; when the risk tank is marked as an output tank, the tank to be replaced which needs to stop running and be supplemented is identified, the output tank is controlled to transport the liquid asphalt in the output tank to the tank to be replaced.

[0010] Preferably, the zero-position tank is assigned a unique number, the initial liquid level is detected and recorded by using a liquid level detection system, and an alarm threshold is set for the zero-position tank according to the preset running parameters of each zero-position tank;

[0011] The real-time liquid level data is compared with the alarm threshold corresponding to the zero-position tank, when the real-time liquid level data is greater than the alarm threshold, the zero-position tank is marked as a risk tank.

[0012] Preferably, the liquid level detection system comprises a hydraulic sensor, and further comprises detecting and recording the liquid surface pressure information in each zero-position tank by using the hydraulic sensor, and converting the real-time liquid level data based on the liquid surface pressure information and the pre-stored structure parameters of the zero-position tank.

[0013] Preferably, the step of judging the real-time liquid level change trend of the risk tank comprises collecting the liquid level data of the risk tank at a plurality of continuous time points to form a liquid level data sequence, and calculating the liquid level change slope on the time sequence based on the liquid level data sequence, when the liquid level change slope is positive, it is determined that the real-time liquid level change trend is liquid level rising, and when the liquid level change slope is negative, it is determined that the real-time liquid level change trend is liquid level falling.

[0014] Preferably, before judging the real-time liquid level change trend, the step of obtaining a preset critical liquid level of the risk tank is further included, whether the real-time liquid level data of the risk tank is greater than the critical liquid level is judged, when yes, the step of judging the real-time liquid level change trend is executed, and when no, an alarm signal is triggered and the liquid asphalt is stopped from being delivered to the rest of the zero-position tanks.

[0015] Preferably, the step of setting the adjusted liquid level value comprises subtracting the adjustment tolerance from the current liquid level data of the input tank to obtain the adjusted liquid level value.

[0016] Preferably, before the step of controlling the adjusted exchange tank to supplement the liquid asphalt to the input tank, the method further comprises obtaining the safety reserve capacity of each adjusted exchange tank, determining whether the equal distribution of the supplement task to each adjusted exchange tank will cause the liquid level of the adjusted exchange tank to be lower than the safety reserve capacity of the adjusted exchange tank, and if so, re-distributing the supplement task to the remaining adjusted exchange tanks that meet the safety reserve capacity.

[0017] Preferably, the tank to be replaced is marked as a consumption tank, the consumption of liquid asphalt of the consumption tank in a unit time period is counted, a preset rated safety period is obtained, and it is determined whether the cumulative running time of the consumption tank reaches the rated safety period.

[0018] If not, the mark of the consumption tank is maintained, and the supplement operation of liquid asphalt to the consumption tank is delayed.

[0019] If so, the mark of the consumption tank is reset, so that the consumption tank returns to the zero tank that can participate in the liquid level control.

[0020] The application 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:

[0021] A configuration module is configured to assign a unique number to each of the plurality of distributed zero tanks, record the initial liquid level of each zero tank, and configure a liquid level detection system in each zero tank.

[0022] A threshold setting module is configured to set an alarm threshold for each zero tank according to preset operating parameters of the zero tank.

[0023] A risk identification module is configured to collect real-time liquid level data of each zero tank in real time by using the liquid level detection system, compare the real-time liquid level data with the alarm threshold corresponding to the zero tank, and mark the zero tank as a risk tank when the real-time liquid level data is greater than the alarm threshold.

[0024] A direction calibration module is configured to determine the real-time liquid level change trend of the risk tank, mark the risk tank as an input tank when the real-time liquid level change trend is a liquid level rise, and mark the risk tank as an output tank when the real-time liquid level change trend is a liquid level drop.

[0025] An exchange tank identification module is configured to determine an adjustment tolerance and set an adjusted liquid level value for the input tank, collect current liquid level data of the remaining zero tanks except the input tank, and set the zero tank with the current liquid level data less than the adjusted liquid level value as an adjusted exchange tank.

[0026] The regulating execution module calculates the total amount of liquid asphalt required for the input tank to recover to the target liquid level, allocates the total amount of liquid asphalt equally to each regulating exchange tank, and controls the regulating exchange tank to supplement the liquid asphalt to the input tank;

[0027] The output switching module identifies the to-be-replaced tank that needs to be stopped and supplemented when the risk tank is designated as the output tank, and controls the output tank to deliver the liquid asphalt in the output tank to the to-be-replaced tank. Advantages

[0028] The present application identifies the risk tank by comparing the liquid level with the alarm threshold in real time, judges the change trend based on the change slope calculated based on the liquid level data sequence, and accurately designates the risk tank as an "input tank" (liquid level rises) or an "output tank" (liquid level falls). The present application realizes automatic classification of liquid level abnormalities, identifies the specific type of risk, and provides accurate basis for subsequent targeted regulation. Compared with traditional single alarm, the intelligent level of autonomous response and processing is improved.

[0029] The present application determines the regulating tolerance based on real-time liquid level fluctuation for the input tank, selects multiple regulating exchange tanks, equally allocates tasks when performing supplementation, and pre-checks the safety reserve capacity of each regulating exchange tank to prevent excessive reduction of the liquid level. The present application constructs a dynamic cooperative liquid level balancing mechanism. The mechanism disperses the regulating load through multi-tank cooperation and prevents secondary risks through safety capacity inspection, overcomes the defect that single-point regulation easily causes chain fluctuation, and ensures the stability of regulation.

[0030] The present application adds a safety check before regulation, i.e., judges whether the liquid level of the risk tank is greater than the preset critical liquid level. If not, an alarm is immediately given and the operation is stopped. When processing the output tank, directional supplementation to the specific tank is realized by identifying the to-be-replaced tank, which enhances the operation reliability. The critical liquid level inspection serves as a key safety line to prevent false processing of serious abnormalities, and the directional supplementation logic ensures that the asphalt resources are accurately delivered to the specified tank, avoiding resource misallocation and improving operation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a flowchart of the distributed zero-position tank liquid level automatic control method of the present application; DETAILED DESCRIPTION

[0032] Embodiment One

[0033] The present embodiment provides a distributed zero-position tank liquid level automatic control method, comprising the following steps:

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] For the zero-position tank that has been marked as a risk tank, determine the root cause of the change in the liquid level. Before making the change trend judgment, 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 limit capacity of the tank body physical structure or the absolute 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 yes, it indicates that the situation is urgent and an overflow may occur or has occurred. An alarm signal such as an audible and visual alarm will be triggered immediately, and an emergency shutdown instruction will be sent to the central control room. At the same time, all liquid asphalt delivery activities between other zero-position tanks are forcibly stopped to isolate the fault point and prevent the situation from getting worse. If no, that is, the real-time liquid level exceeds the alarm threshold but is below the critical liquid level, it is considered that the situation is controllable, and the next step of real-time liquid level change trend judgment is continued.

[0039] To determine the real-time liquid level change trend, collect the liquid level data of the risk tank at multiple consecutive time points to form a liquid level data sequence. Based on the liquid level data sequence, the change trend is quantified by calculating the liquid level change slope on the time sequence. For example, the least squares method can be used to linearly fit the data sequence to obtain the slope. When the calculated liquid level change slope is positive, it is determined that the real-time liquid level change trend is rising, indicating that the risk tank is receiving liquid asphalt. The risk tank is marked as an input tank. When the liquid level change slope is negative, it is determined that the real-time liquid level change trend is falling, indicating that the risk tank is delivering liquid asphalt outward, but its initial liquid level is too high, which poses a management risk. It is marked as an output tank.

[0040] Specifically, the liquid level change slope refers to a calculation model for quantifying the rate and direction of liquid level change over time.

[0041] Input: A series of discrete liquid level data points collected within a time period, represented as a liquid level data sequence .

[0042] Output: Liquid level change slope , which represents the linear trend of the liquid level change.

[0043] Mathematical formula:

[0044]

[0045] The formula is a linear regression model based on the least squares method, used to calculate the slope of the straight line fitting the data points.

[0046] In the formula,

[0047] ​(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.

[0048] (number of data points): the total number of level data samples used to calculate the slope;

[0049] (Timestamp): The acquisition time of each liquid level data point;

[0050] (Instantaneous liquid level): at time Measured liquid level height.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] Before issuing the replenishment control instruction, a safety check is performed in advance to obtain the safety reserve capacity of each regulating exchange tank, which is the minimum amount of asphalt that must be reserved to ensure the safe operation of the regulating exchange tank. The replenishment task allocated to each regulating exchange tank is calculated in advance, and it is determined whether the liquid level of the regulating exchange tank will be lower than its safety reserve capacity if the replenishment task is allocated. If so, it indicates that the regulating exchange tank cannot bear the current allocated task amount, and it is excluded from this task, and the replenishment task originally undertaken by it is proportionally reallocated to the remaining regulating exchange tanks that meet the safety reserve capacity condition. When the risk tank is designated as an output tank, it indicates that its liquid level is abnormally high but is decreasing, or it is designated as an input tank and then resumes normal operation as an output source. The tank to be replaced is identified, which needs to stop running and be replenished due to planned maintenance or its liquid level has fallen below the lower limit of normal operation. The output tank is controlled to switch the liquid asphalt in it to the tank to be replaced through the pipeline, completing efficient resource scheduling.

[0055] A label of consumption state is introduced. When the tank to be replaced is selected and starts receiving asphalt, the tank to be replaced is labeled as a consumption tank. The consumption of liquid asphalt by the consumption tank in a unit time period is counted, and the cumulative running time of the consumption tank as a consumption tank is recorded. A preset rated safety period is obtained, which counts the reasonable running time of the tank as a main consumption unit. It is determined whether the cumulative running time of the consumption tank reaches the rated safety period. When it does not reach, the label of the consumption tank is maintained, and any new replenishment of liquid asphalt to the consumption tank is actively delayed to avoid frequent small-dose replenishment and improve operation efficiency. When the cumulative running time reaches the rated safety period, the label of the consumption tank is reset to restore it to the zero tank state that can participate in liquid level control.

[0056] Through the above method, not only can the remaining zero tanks replenish and control before the liquid level of the zero tank reaches the alarm threshold, but also the liquid flow path can be dynamically allocated or replaced. Combined with the liquid level fluctuation law, the safety and efficiency of the entire liquid asphalt storage system operating at high temperature are ensured, and the risk of overpressure, leakage or explosion caused by abnormal liquid level at a single point is effectively prevented.

[0057] Embodiment Two

[0058] The embodiment provides a distributed zero tank liquid level automatic control system for implementing the distributed zero tank liquid level automatic control method described above, mainly comprising the following modules:

[0059] 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;

[0060] 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.

[0061] 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;

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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 the adjustment exchange tank, calculate the total amount of liquid asphalt required to restore the input tank to the target liquid level, distribute the total amount of liquid asphalt equally to each adjustment exchange tank, and control the adjustment exchange tank to replenish liquid asphalt to the input tank; when the risk tank is marked as the 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; Among them, a unique number is assigned to the zero position slot, and the liquid level detection system is used to detect and record the initial liquid level. The 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 position slot. When the real-time liquid level data is greater than the alarm threshold, the zero position slot is marked as a risk slot.

2. A distributed zero tank liquid level automatic control method according to claim 1, 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.

3. 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. 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 7, 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.

Images