Liquid unloading control method and device for pump tank truck, pump tank truck and storage medium

Abstract

The application provides a liquid unloading control method and device for a pump tank truck, the pump tank truck and a storage medium. The liquid unloading control method comprises the following steps: determining the liquid filling authority of a liquid storage tank; controlling the liquid unloading of the pump tank truck when the liquid filling authority is available; monitoring the liquid unloading amount of the pump tank truck and the liquid level in the liquid storage tank in real time during the liquid unloading process, and determining whether the liquid unloading is abnormal according to the liquid unloading amount of the pump tank truck and the liquid level change in the liquid storage tank; if the determination result is normal, the pump tank truck continues to unload liquid; if the determination result is abnormal, the pump tank truck stops unloading liquid. The liquid unloading control method provided in the application embodiment can monitor the liquid unloading amount of the pump tank truck and the liquid level in the liquid storage tank in real time during the liquid unloading process, then compare the liquid unloading amount of the pump tank truck and the liquid level change in the liquid storage tank to determine whether the liquid unloading is abnormal, and interrupt the liquid unloading when it is abnormal, thereby effectively maintaining the liquid unloading safety of the pump tank truck and preventing illegal liquid unloading.

Description

Technical Field

[0001] This application relates to the field of liquid unloading control method, control device, pumped tanker truck and storage medium. Background Technology

[0002] In existing technologies, liquid media such as liquid oxygen, liquid nitrogen, and liquefied natural gas are typically transported to unloading points using vehicles, such as tank trucks equipped with pumps, and then unloaded into authorized storage tanks. These unloading points are often located in remote areas. During the unloading process, if the media in the tank truck does not flow to the matched storage tank but instead flows into an unauthorized, illegal storage tank, it can lead to theft of liquid from the tank truck, posing a significant safety hazard. Therefore, plugging these unloading loopholes, preventing illegal unloading, and ensuring the safe operation of tank trucks equipped with pumps is a pressing technical problem that needs to be solved. Summary of the Invention

[0003] This application provides a liquid unloading control method, control device, pumped tanker truck, and storage medium. The control method of this application monitors the unloading volume of the pumped tanker truck and the liquid level change in the storage tank in real time, and stops unloading immediately when the liquid level change in the storage tank is abnormal, effectively preventing the liquid from being illegally unloaded.

[0004] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0005] In one technical solution of this application, a method for controlling the unloading of liquid from a tanker truck equipped with a pump is proposed, the method comprising:

[0006] Determine the authority to fill the storage tank;

[0007] With the authority to fill the tanker, control the unloading of the pumped tanker.

[0008] During the unloading process, the unloading volume of the pumped tanker and the liquid level in the storage tank are monitored in real time. The unloading is judged to be abnormal based on the changes in the unloading volume of the pumped tanker and the liquid level in the storage tank.

[0009] If the determination result is normal, the pumped tanker truck will continue unloading; if the determination result is abnormal, the pumped tanker truck will stop unloading.

[0010] In one technical solution of this application, the unloading volume of the pumped tanker truck and the liquid level in the storage tank are monitored in real time, and the unloading is judged to be abnormal based on the changes in the unloading volume of the pumped tanker truck and the liquid level in the storage tank. Specifically, this includes:

[0011] Obtain the initial liquid level in the storage tank;

[0012] If the initial liquid level in the storage tank is greater than or equal to the first preset threshold and less than the second preset threshold, the total unloading volume of the pumped tanker and the liquid level in the storage tank are monitored in real time, and it is determined whether the liquid level in the storage tank at the moment when the total unloading volume reaches the preset volume is greater than or equal to the upper limit of the preset range. If yes, the result is normal; if no, the result is abnormal.

[0013] If the initial liquid level in the storage tank is greater than or equal to the second preset threshold and less than the third preset threshold, then the actual unloading volume of the pumped tanker and the actual liquid level increment of the storage tank within the preset time period are monitored. The theoretical liquid level increment is determined based on the actual unloading volume, and it is determined whether the deviation between the theoretical liquid level increment and the actual liquid level increment is less than or equal to a preset value. If yes, the result is normal; otherwise, the result is abnormal.

[0014] In one technical solution of this application, after the step of real-time monitoring of the total unloading volume of the pumped tanker and the liquid level in the storage tank, and determining that the liquid level in the storage tank at the moment when the total unloading volume reaches a preset volume is greater than or equal to the upper limit of the preset range, if the initial liquid level in the storage tank is greater than or equal to a first preset threshold and less than a second preset threshold, the method further includes:

[0015] Determine whether the current liquid level in the storage tank exceeds a fourth preset threshold, wherein the fourth preset threshold is between the second preset threshold and the third preset threshold. If not, proceed with the following steps:

[0016] The actual unloading volume of the pumped tanker truck and the actual liquid level increment of the storage tank within the first preset time period are collected.

[0017] The first theoretical liquid level increment is determined based on the actual unloading volume within the first preset time period, and it is determined whether the deviation between the first theoretical liquid level increment and the actual liquid level increment within the first preset time period is less than or equal to the first preset value. If yes, the result is normal; otherwise, the result is abnormal.

[0018] The actual unloading volume of the pumped tanker truck and the actual liquid level increment of the storage tank within the second preset time period are collected.

[0019] The second theoretical liquid level increment is determined based on the actual unloading volume within the second preset time period, and it is determined whether the deviation between the second theoretical liquid level increment and the actual liquid level increment within the second preset time period is less than or equal to the second preset value. If yes, the result is normal; otherwise, the result is abnormal.

[0020] If so, perform the following steps:

[0021] The actual unloading volume of the pumped tanker truck and the actual liquid level increment of the storage tank within the third preset time period are collected.

[0022] The third theoretical liquid level increment is determined based on the actual unloading volume within the third preset time period, and it is determined whether the deviation between the third theoretical liquid level increment and the actual liquid level increment within the third preset time period is less than or equal to the third preset value. If yes, the result is normal; otherwise, the result is abnormal.

[0023] Wherein, the first preset duration is greater than the second preset duration, and the first preset duration is less than or equal to the third preset duration.

[0024] In one technical solution of this application, if the initial liquid level in the storage tank is greater than or equal to a second preset threshold and less than a third preset threshold, then the steps of monitoring the actual unloading volume of the pumped tanker truck within a preset time period and the actual liquid level increment of the storage tank within the preset time period, determining the theoretical liquid level increment based on the actual unloading volume, and determining that the deviation between the theoretical liquid level increment and the actual liquid level increment is less than or equal to a preset value specifically include:

[0025] If the initial liquid level in the storage tank is greater than or equal to the second preset threshold and less than the fourth preset threshold, then the actual unloading volume of the pumped tanker and the actual liquid level increment of the storage tank within the first preset time period are collected.

[0026] The first theoretical liquid level increment is determined based on the actual unloading volume within the first preset time period, and it is determined whether the deviation between the first theoretical liquid level increment and the actual liquid level increment within the first preset time period is less than or equal to the first preset value. If yes, the result is normal; otherwise, the result is abnormal.

[0027] The actual unloading volume of the pumped tanker truck and the actual liquid level increment of the storage tank within the second preset time period are collected.

[0028] The second theoretical liquid level increment is determined based on the actual unloading volume within the second preset time period, and it is determined whether the deviation between the second theoretical liquid level increment and the actual liquid level increment within the second preset time period is less than or equal to the second preset value. If yes, the result is normal; otherwise, the result is abnormal.

[0029] If the initial liquid level in the storage tank is greater than or equal to the fourth preset threshold and less than the third preset threshold, then the actual unloading volume of the pumped tanker and the actual liquid level increment of the storage tank within the third preset time period are collected.

[0030] The third theoretical liquid level increment is determined based on the actual unloading volume within the third preset time period, and it is determined whether the deviation between the third theoretical liquid level increment and the actual liquid level increment within the third preset time period is less than or equal to the third preset value. If yes, the result is normal; otherwise, the result is abnormal.

[0031] Wherein, the fourth preset threshold is between the second preset threshold and the third preset threshold, the first preset duration is greater than the second preset duration, and the first preset duration is less than or equal to the third preset duration.

[0032] In one technical solution of this application, the liquid storage tank is equipped with a float-type liquid level gauge, which includes a float;

[0033] When the liquid level in the storage tank is lower than the second preset threshold, the float remains at the preset lowest position, and the float-type level gauge sends a signal that the liquid level is zero.

[0034] When the liquid level in the storage tank is higher than or equal to the second preset threshold, the float rises away from the preset minimum position, and the float-type liquid level gauge sends a corresponding liquid level signal in response to the position height of the float.

[0035] In one technical solution of this application, monitoring the actual unloading volume of the pumped tanker truck within a preset time period specifically includes:

[0036] Monitor the flow rate at the unloading end of the tanker truck equipped with a pump;

[0037] Calculate the product of the flow rate value and the preset duration, and use the product as the actual unloading volume.

[0038] In one technical solution of this application, the unloading control method further includes:

[0039] Obtain the initial liquid level in the storage tank;

[0040] Based on the initial liquid level, a judgment scheme is established to determine whether the unloading is abnormal. The judgment scheme specifically includes:

[0041] If the initial liquid level in the storage tank is greater than or equal to the first preset threshold and less than the second preset threshold, the total unloading volume of the pumped tanker and the liquid level in the storage tank are monitored in real time, and it is determined whether the liquid level in the storage tank at the moment when the total unloading volume reaches the preset volume is greater than or equal to the upper limit of the preset range. If yes, the result is normal; if no, the result is abnormal.

[0042] If the initial liquid level in the storage tank is greater than or equal to the second preset threshold and less than the third preset threshold, then the actual unloading volume of the pumped tanker and the actual liquid level increment of the storage tank within the preset time period are monitored. The theoretical liquid level increment is determined based on the actual unloading volume, and it is determined whether the deviation between the theoretical liquid level increment and the actual liquid level increment is less than or equal to a preset value. If yes, the result is normal; otherwise, the result is abnormal.

[0043] In one technical solution of this application, the step of determining the filling authority for the storage tank specifically includes:

[0044] Obtain the equipment identifier of the storage tank;

[0045] Based on the device identifier, a matching request is sent to the liquid storage device;

[0046] If the match is successful, it is determined that the tanker truck with pump has the authority to fill the storage tank.

[0047] In another technical solution of this application, this application provides a liquid unloading control device with a pump truck, the liquid unloading control device comprising:

[0048] A memory, on which programs or instructions are stored;

[0049] A processor that executes the program or instructions to implement the steps of the unloading control method as described in any of the preceding claims.

[0050] In another technical solution of this application, this application provides a pump truck, comprising:

[0051] Vehicle body;

[0052] A tank body, mounted on the vehicle body, is provided with a discharge end for discharging liquid, and the discharge end is equipped with a flow monitoring device; and

[0053] The control device described above is communicatively connected to the tank and the storage tank.

[0054] In another technical solution of this application, this application provides a computer-readable storage medium having a program or instructions stored thereon, which, when executed by a processor, implement the steps of the unloading control method as described above.

[0055] The beneficial effects of this application are:

[0056] The unloading control method, control device, pumped tanker, and storage medium provided in this application embodiment monitor the unloading volume of the pumped tanker and the liquid level in the storage tank in real time during the unloading process. Then, the changes in the unloading volume of the pumped tanker and the liquid level in the storage tank are compared to determine whether the unloading is abnormal. If an abnormality occurs, the unloading is interrupted, which effectively maintains the unloading safety of the pumped tanker and prevents illegal unloading.

[0057] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0058] The above and other objectives, features and advantages of this application will become more apparent from a detailed description of exemplary embodiments thereof with reference to the accompanying drawings.

[0059] Figure 1 This is a schematic flowchart of an embodiment of the liquid unloading control method of this application.

[0060] Figure 2 This is a schematic diagram of a process for determining whether unloading is abnormal based on the unloading volume of the pumped tanker truck and the change in liquid level in the storage tank, according to one embodiment of this application.

[0061] Figure 3 This is a schematic diagram of a process for controlling unloading based on the current liquid level in the storage tank according to one embodiment of this application.

[0062] Figure 4 This is a structural block diagram of a liquid unloading control device according to an embodiment of this application. Detailed Implementation

[0063] Although this application can be readily embodied in various forms of implementation, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. It is understood that this specification should be regarded as an exemplary illustration of the principles of this application and is not intended to limit the application to what is described herein.

[0064] Therefore, a feature described in this specification is used to illustrate one feature of one embodiment of this application, and does not imply that every embodiment of this application must have the described feature. Furthermore, it should be noted that this specification describes many features. While certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0065] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, inside, outside, left, right, front, back, etc.) used to explain the structure and movement of the various components of this application are relative rather than absolute. These descriptions are appropriate when these components are in the positions shown in the drawings. If the description of the positions of these components changes, these directional indications also change accordingly.

[0066] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided to make the description of this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The drawings are merely illustrative of this application and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0067] The preferred embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0068] In this application, a pump-equipped tanker truck is used to transport liquid media such as liquid oxygen, liquid nitrogen, and liquefied natural gas, and to transfer the transported liquid media to a storage tank at the unloading point. The storage tank is used to store liquid media such as liquid oxygen, liquid nitrogen, and liquefied natural gas. To ensure the safety and legality of the use of these liquid media, the storage tank must meet relevant usage requirements and be certified or authorized for storing these liquid media; such storage tanks can be referred to as legal storage tanks.

[0069] If, during the unloading process of a tanker truck with a pump, the liquid being unloaded does not flow into a legal storage tank but instead flows into an unauthorized, illegal storage tank—for example, if the inlet of the storage tank is illegally equipped with a bypass structure, causing the liquid unloaded from the tanker truck to actually enter the storage tank but instead flow into an illegal storage tank through the bypass structure; or if the storage tank has an illegally installed outlet, causing the liquid unloaded from the tanker truck to enter the storage tank but then be transferred through the storage tank to an illegal storage tank—this illegal unloading and theft of liquid is difficult to detect because unloading points are usually located in remote areas, causing not only property damage but also significant safety hazards.

[0070] Based on this, this application proposes a liquid unloading control method, control device, pumped tanker truck and storage medium to effectively prevent illegal liquid unloading.

[0071] Figure 1This is a flowchart illustrating a liquid unloading control method for a pumped tanker truck according to an exemplary embodiment. The liquid unloading method for the pumped tanker truck can be specifically executed by a controller for the pumped tanker truck. This controller can be implemented by a programmable logic controller (PLC), a central processing unit (CPU), or other chips such as microprocessors or single-chip microcomputers. In this embodiment, the liquid unloading method for the pumped tanker truck includes at least the following steps S101 to S105.

[0072] S101: Determine the filling authority for the storage tank.

[0073] As an example, taking data communication between a pump-equipped tanker and a storage tank via Long Range Radio (LoRa) technology as an example, the pump-equipped tanker can be equipped with an electronic identification device, and the storage tank can be equipped with an equipment identifier. In this way, when the pump-equipped tanker travels to a set range, the electronic identification device uses a designated frequency band to connect with the storage equipment, obtains the equipment identifier of the storage tank, and sends a matching request to the storage tank based on the equipment identifier. If the pump-equipped tanker receives a successful matching response from the storage tanker, it means that the two are successfully matched, and it is determined that the pump-equipped tanker has the authority to fill the storage tank.

[0074] Having the authority to fill liquid means that the storage tank is a storage tank that has the conditions for unloading liquid, meets the safety precautions, meets the safety standards, and has been declared and certified. Liquids from tank trucks with pumps can be unloaded and stored in the storage tank.

[0075] S102: If the liquid filling authority is available, control the unloading of the pumped tanker truck.

[0076] For example, a tanker truck with a pump has a discharge end for discharging liquid. With filling authority, the discharge end of the tanker truck can be connected to the inlet of a storage tank via, for example, a discharge pipeline or discharge gun, to deliver liquid into the storage tank. As an example, a discharge pump is provided at the discharge end. After the controller of the tanker truck receives a successful matching response from the storage tank, the tanker truck can generate an instruction to open the discharge pump based on the authorization information indicating filling authority. The discharge pump then starts, unloading liquid from the tanker truck and delivering it into the storage tank.

[0077] S103: During the unloading process, the unloading volume of the pumped tanker and the liquid level in the storage tank are monitored in real time, and the unloading is judged to be abnormal based on the changes in the unloading volume of the pumped tanker and the liquid level in the storage tank.

[0078] S104: If the determination result is normal, control the tanker truck with pump to continue unloading liquid;

[0079] S105: If the judgment result is abnormal, control the pumped tanker to stop unloading liquid.

[0080] For example, a flow monitoring device can be installed at the unloading end of the pumped tanker truck to obtain the unloading volume based on the liquid flow rate. A liquid level monitoring device is installed in the storage tank to obtain the liquid level in the storage tank in real time. Based on the unloading volume and liquid level changes, it is determined whether the amount of liquid flowing out of the pumped tanker truck matches the amount of liquid flowing into the storage tank, thereby determining whether the unloading is abnormal. If the amount of liquid flowing out of the pumped tanker truck and the amount of liquid flowing into the storage tank do not match, for example, if the amount of liquid flowing into the storage tank is less than the amount of liquid flowing out of the pumped tanker truck, i.e., the unloading is abnormal, the pumped tanker truck can generate a command to shut down the unloading pump through the controller. The unloading pump is shut down and locked, stopping the unloading. If the amount of liquid flowing into the storage tank is equal to the amount of liquid flowing out of the pumped tanker truck, i.e., the unloading is normal, and unloading continues.

[0081] It should be noted that the amount of liquid flowing into the storage tank equals the amount of liquid flowing out of the pumped tanker does not simply mean that the inflow and outflow are exactly equal. Due to the influence of monitoring errors of the flow monitoring device and liquid level monitoring device, a certain preset deviation is allowed between the two. If the amount of liquid flowing into the storage tank is less than the amount of liquid flowing out of the pumped tanker, and the difference between the two is within the allowable preset deviation, then the unloading is considered normal.

[0082] In the method of the above embodiments, the controller may have an alarm module to alert when there is an abnormality in the unloading process, thereby indicating the existence of illegal unloading behavior and effectively preventing theft of liquid. Alternatively, the alarm may be implemented through an alarm device. When an abnormal situation occurs, the controller sends an alarm signal to the alarm device according to the abnormal situation. The alarm device receives the alarm signal sent by the controller and alarms. The alarm device may include an audible and visual alarm, an SMS alarm, or a video surveillance alarm.

[0083] In one technical solution of this application, such as Figure 2 As shown, the system monitors the unloading volume of the pumped tanker truck and the liquid level in the storage tank in real time. Based on changes in the unloading volume and liquid level in the storage tank, it determines whether the unloading is abnormal. Specifically, this includes:

[0084] S201: Obtain the initial liquid level in the storage tank;

[0085] S202: If the initial liquid level in the storage tank is greater than or equal to the first preset threshold and less than the second preset threshold, then the total unloading volume of the pumped tanker and the liquid level in the storage tank are monitored in real time, and it is determined whether the liquid level in the storage tank at the moment when the total unloading volume reaches the preset volume is greater than or equal to the upper limit of the preset range. If yes, the result is normal; if no, the result is abnormal.

[0086] S203: If the initial liquid level in the storage tank is greater than or equal to the second preset threshold and less than the third preset threshold, then monitor the actual unloading volume of the pumped tanker truck within a preset time period and the actual liquid level increment of the storage tank within the preset time period. Determine the theoretical liquid level increment based on the actual unloading volume, and determine whether the deviation between the theoretical liquid level increment and the actual liquid level increment is less than or equal to a preset value. If yes, the result is normal; if no, the result is abnormal.

[0087] For example, before the pumped tanker truck unloads liquid into the storage tank, the initial liquid level in the storage tank is first obtained. If the initial liquid level is greater than or equal to a first preset threshold but less than a second preset threshold, the liquid level in the storage tank at the moment when the total unloading volume of the pumped tanker truck reaches a preset volume is determined to be greater than or equal to the second preset threshold. If so, the unloading is determined to be normal, and the pumped tanker truck is controlled to continue unloading. Otherwise, the unloading is determined to be abnormal, and the pumped tanker truck is controlled to stop unloading. If the initial liquid level in the storage tank is greater than or equal to the second preset threshold but less than a third preset threshold, the actual unloading volume of the pumped tanker truck and the actual liquid level increment of the storage tank within a preset time period are monitored. The theoretical liquid level increment is determined based on the actual unloading volume, and it is determined whether the deviation between the theoretical liquid level increment and the actual liquid level increment is less than or equal to a preset value. If so, the unloading is determined to be normal, and the pumped tanker truck is controlled to continue unloading. Otherwise, the unloading is determined to be abnormal, and the pumped tanker truck is controlled to stop unloading.

[0088] The first preset threshold, second preset threshold, third preset threshold, preset volume, preset duration, and preset value can be preset based on the upper and lower monitoring limits and equipment parameter information (volume, shape, and size) of the liquid level monitoring device of the storage tank. The actual liquid level increment in the storage tank can be the difference between the current liquid level and its initial liquid level at the preset time point when the pump truck has unloaded the liquid, or it can be the difference between the current percentage of the liquid level and the initial percentage of the liquid level. The theoretical liquid level increment in the storage tank can be obtained based on the actual unloading volume and the shape and size of the storage tank.

[0089] In one example of this application, the first preset threshold corresponds to the lowest liquid level in the storage tank, and its value can be zero, meaning there is no liquid in the storage tank and its liquid level is zero. The third preset threshold corresponds to the highest liquid level in the storage tank. The second preset threshold is determined based on the measurement blind zone of the liquid level monitoring device, that is, the second preset threshold corresponds to the minimum measurement value of the liquid level monitoring device. Due to its own structural limitations, the liquid level monitoring device has a portion of unidentifiable area, i.e., a minimum measurement value. When the liquid level in the storage tank is within the measurement blind zone of the liquid level monitoring device, i.e., when the liquid level in the storage tank is lower than the minimum measurement value of the liquid level monitoring device, the liquid level monitoring device cannot read the actual liquid level in the storage tank and will maintain a zero-level signal output. For example, for an ultrasonic level gauge, there is a small unidentifiable area between the ultrasonic transducer transmitting and receiving ultrasonic pulses. For example, for a float-type level gauge, its float has a preset lowest position, and the liquid level below the preset lowest position of the float is the measurement blind zone of the float-type level gauge.

[0090] In a specific example, the liquid level in the storage tank is expressed as a percentage of height, ranging from 0-100%. The liquid level in the storage tank is measured using a float-type level gauge, which includes a float and has a value range of 0-100%. A first preset threshold is set to 0, a second preset threshold is set to a%, a% corresponds to the minimum measured value of the float-type level gauge, and a third preset threshold is set to 100%. If the initial liquid level in the storage tank is greater than or equal to 0 and less than a%, the minimum liquid volume required to reach the minimum measured value of the float-type level gauge is determined based on the minimum measured value. Based on this, the total unloading volume of the pumped tanker and the liquid level in the storage tank are monitored in real time. It is then determined whether the liquid level in the storage tank at the moment when the total unloading volume reaches or exceeds the minimum liquid volume is greater than or equal to a%. If yes, the result is considered normal; otherwise, the result is considered abnormal. For example, if 12% is the minimum measurement value of the float-type level gauge, and assuming that the minimum liquid volume required to bring the liquid level in the storage tank to its minimum measurement value is determined to be 120L based on the minimum measurement value of the float-type level gauge, then the total unloading volume of the tanker truck with pump and the liquid level in the storage tank are monitored in real time, and it is determined whether the liquid level in the storage tank at the moment when the total unloading volume reaches or exceeds 120L (e.g., 120L, 130L, or 140L) is greater than or equal to 12%. If yes, the result is considered normal; if no, the result is considered abnormal.

[0091] Furthermore, if the initial liquid level in the storage tank is greater than or equal to a% and less than 100%, the level gauge can accurately measure the liquid level in the storage tank, thus monitoring the actual unloading volume of the pumped tanker truck and the actual liquid level increment of the storage tank within each preset time interval. As the unloading process proceeds, the liquid volume in the storage tank increases. Therefore, the actual liquid level increment can be calculated based on the liquid level data obtained from two consecutive times. That is, the actual liquid level increment is the difference in liquid level in the storage tank from the start of the preset time interval to the current time. The actual liquid level increment reflects the change in liquid volume in the storage tank. Furthermore, the theoretical liquid level increment can be determined based on the actual unloading volume. By judging whether the deviation between the theoretical liquid level increment and the actual liquid level increment is less than or equal to a preset value, it is determined whether the unloading is normal. That is, every set time interval, it is judged whether the amount of liquid flowing into the storage tank and the amount of liquid flowing out of the pumped tanker truck match, so as to detect illegal unloading in a timely manner. This is done to improve the sensitivity of safety monitoring and facilitate the timely detection of illegal unloading. The sampling period should not be too long, and can be on the order of seconds. For example, the preset duration can be 5-30 seconds, such as 5 seconds, 10 seconds, 15 seconds, 20 seconds, or 30 seconds, which can be set according to specific circumstances.

[0092] The control method of this embodiment uses two different discrimination methods to determine whether the unloading is normal based on the initial liquid level range in the storage tank. It takes into account the measurement blind zone of the liquid level monitoring device, which improves the accuracy of liquid level monitoring and the accuracy of illegal unloading detection, so as to provide timely and accurate early warning of illegal unloading.

[0093] In one technical solution of this application, such as Figure 3 As shown, after the step of monitoring the total unloading volume of the pumped tanker truck and the liquid level in the storage tank in real time, and determining that the liquid level in the storage tank at the moment when the total unloading volume reaches the preset volume is greater than or equal to the upper limit of the preset range, if the initial liquid level in the storage tank is greater than or equal to the first preset threshold and less than the second preset threshold, the method further includes:

[0094] S301: Determine whether the current liquid level in the storage tank exceeds a fourth preset threshold, wherein the fourth preset threshold is between the second preset threshold and the third preset threshold. If not, proceed with the following steps:

[0095] S302: Collect the actual unloading volume of the pumped tanker truck and the actual liquid level increment of the storage tank within the first preset time period;

[0096] S303: Determine the first theoretical liquid level increment based on the actual unloading volume within the first preset time period, and determine whether the deviation between the first theoretical liquid level increment and the actual liquid level increment within the first preset time period is less than or equal to the first preset value. If yes, the determination result is normal; otherwise, the determination result is abnormal.

[0097] S304: Collect the actual unloading volume of the pumped tanker truck and the actual liquid level increment of the storage tank within the second preset time period;

[0098] S305: Determine the second theoretical liquid level increment based on the actual unloading volume within the second preset time period, and determine whether the deviation between the second theoretical liquid level increment and the actual liquid level increment within the second preset time period is less than or equal to the second preset value. If yes, the result is normal; otherwise, the result is abnormal.

[0099] If so, perform the following steps:

[0100] S306: Collect the actual unloading volume of the pumped tanker truck within a third preset time period and the actual liquid level increment of the storage tank within the third preset time period;

[0101] S307: Determine the third theoretical liquid level increment based on the actual unloading volume within the third preset time period, and determine whether the deviation between the third theoretical liquid level increment and the actual liquid level increment within the third preset time period is less than or equal to the third preset value. If yes, the result is normal; otherwise, the result is abnormal.

[0102] Wherein, the first preset duration is greater than the second preset duration, and the first preset duration is less than or equal to the third preset duration.

[0103] For example, before the pumped tanker truck unloads liquid into the storage tank, the initial liquid level in the storage tank is first obtained. If the initial liquid level is greater than or equal to a first preset threshold and less than a second preset threshold, the liquid level in the storage tank at the moment when the total unloading volume of the pumped tanker truck reaches a preset volume is determined to be greater than or equal to the second preset threshold. If so, the unloading is determined to be normal, and the pumped tanker truck is controlled to continue unloading.

[0104] After the liquid is unloaded by the pump truck and the current liquid level in the storage tank is greater than or equal to the second preset threshold, even if the current liquid level in the storage tank is equal to or equal to the liquid level height corresponding to the minimum measurement value of the liquid level monitoring device, it is necessary to further determine whether the current liquid level in the storage tank exceeds the fourth preset threshold.

[0105] If it is determined that the current liquid level in the storage tank does not exceed the fourth preset threshold (i.e., the current liquid level in the storage tank is greater than or equal to the second preset threshold and less than the fourth preset threshold), then firstly, the actual unloading volume of the pumped tanker truck and the actual liquid level increment of the storage tank within the first preset time interval are collected. Based on the actual unloading volume within the first preset time interval, a first theoretical liquid level increment is determined, and it is determined whether the deviation between the first theoretical liquid level increment and the actual liquid level increment within the first preset time interval is less than or equal to a first preset value. Then, the actual unloading volume of the pumped tanker truck and the actual liquid level increment of the storage tank within the second preset time interval are collected, and a second theoretical liquid level increment is determined based on the actual unloading volume within the second preset time interval. It is then determined whether the deviation between the second theoretical liquid level increment and the actual liquid level increment within the second preset time interval is less than or equal to a second preset value.

[0106] The first preset duration is set to be longer than the second preset duration. This is because once the liquid level in the storage tank exceeds the second preset threshold and enters the monitoring range of the liquid level monitoring device, the distance between the pump truck and the storage tank causes instability and lag in the device's ability to read the actual liquid level data and transmit it to the pump truck's controller. Therefore, data is initially collected every first preset duration. After data monitoring and transmission stabilize, data is collected every second preset duration to improve the stability and accuracy of the monitoring. An example of the first preset duration is 10-30 seconds, and an example of the second preset duration is 5-10 seconds.

[0107] If it is determined that the current liquid level in the storage tank exceeds the fourth preset threshold, that is, the current liquid level in the storage tank is greater than or equal to the fourth preset threshold and less than the third preset threshold, then the actual unloading volume of the pumped tanker and the actual liquid level increment of the storage tank within the third preset time period are collected; the third theoretical liquid level increment is determined based on the actual unloading volume within the third preset time period, and it is determined whether the deviation between the third theoretical liquid level increment and the actual liquid level increment within the third preset time period is less than or equal to the third preset value.

[0108] For example, in the above process, the fourth preset threshold is between the second and third preset thresholds. The fourth preset threshold is set according to the monitoring sensitivity of the liquid level monitoring device. For example, the fourth preset threshold is set to b%, which corresponds to the position where the sensitivity of the liquid level monitoring device decreases. That is, the monitoring sensitivity of the liquid level monitoring device decreases significantly when the liquid level in the storage tank is higher than b%. At this time, data is collected every third preset time interval to improve the monitoring accuracy. The third preset time interval is set to be greater than or equal to the first preset time interval. An example of the third preset time interval can be 10-30 seconds.

[0109] The first, second, and third preset values ​​are set according to the actual situation, and they can be the same or different.

[0110] The control method of this embodiment, after the current liquid level in the storage tank exceeds the second preset threshold, collects liquid level data at different preset time intervals within different liquid level ranges based on the monitoring sensitivity of the liquid level monitoring device and the stability of the liquid level monitoring data, so as to achieve more accurate early warning of illegal unloading.

[0111] In one technical solution of this application, if the initial liquid level in the storage tank is greater than or equal to a second preset threshold and less than a third preset threshold, then the steps of monitoring the actual unloading volume of the pumped tanker truck within a preset time period and the actual liquid level increment of the storage tank within the preset time period, determining the theoretical liquid level increment based on the actual unloading volume, and determining that the deviation between the theoretical liquid level increment and the actual liquid level increment is less than or equal to a preset value specifically include:

[0112] S401: If the initial liquid level in the storage tank is greater than or equal to the second preset threshold and less than the fourth preset threshold, then collect the actual unloading volume of the pumped tanker within the first preset time period and the actual liquid level increment of the storage tank within the first preset time period.

[0113] S402: Determine the first theoretical liquid level increment based on the actual unloading volume within the first preset time period, and determine whether the deviation between the first theoretical liquid level increment and the actual liquid level increment within the first preset time period is less than or equal to the first preset value. If yes, the determination result is normal; if no, the determination result is abnormal.

[0114] S403: Collect the actual unloading volume of the pumped tanker truck and the actual liquid level increment of the storage tank within the second preset time period;

[0115] S404: Determine the second theoretical liquid level increment based on the actual unloading volume within the second preset time period, and determine whether the deviation between the second theoretical liquid level increment and the actual liquid level increment within the second preset time period is less than or equal to the second preset value. If yes, the result is normal; otherwise, the result is abnormal.

[0116] S405: If the initial liquid level in the storage tank is greater than or equal to the fourth preset threshold and less than the third preset threshold, then collect the actual unloading volume of the pumped tanker truck within the third preset time period and the actual liquid level increment of the storage tank within the third preset time period.

[0117] S406: Determine the third theoretical liquid level increment based on the actual unloading volume within the third preset time period, and determine whether the deviation between the third theoretical liquid level increment and the actual liquid level increment within the third preset time period is less than or equal to the third preset value. If yes, the result is normal; otherwise, the result is abnormal.

[0118] Wherein, the fourth preset threshold is between the second preset threshold and the third preset threshold, the first preset duration is greater than the second preset duration, and the first preset duration is less than or equal to the third preset duration.

[0119] The control method of this embodiment, when the initial liquid level in the storage tank is greater than or equal to a second preset threshold and less than a third preset threshold, collects liquid level data at different preset time intervals within different liquid level ranges based on the monitoring sensitivity of the liquid level monitoring device and the stability of the liquid level monitoring data, in order to achieve more accurate early warning of illegal unloading. For a detailed explanation of steps S401 to S406, please refer to steps S301 to S307 above, and they will not be described in detail here.

[0120] In one technical solution of this application, the liquid storage tank is equipped with a float-type liquid level gauge, which includes a float;

[0121] When the liquid level in the storage tank is lower than the second preset threshold, the float remains at the preset lowest position, and the float-type level gauge sends a signal that the liquid level is zero.

[0122] When the liquid level in the storage tank is higher than or equal to the second preset threshold, the float rises away from the preset minimum position, and the float-type liquid level gauge sends a corresponding liquid level signal in response to the position height of the float.

[0123] For example, when the liquid level in the storage tank is lower than the second preset threshold, the liquid level in the storage tank is within the monitoring blind zone of the float-type level gauge. At this time, the float remains at the preset lowest position and cannot contact the liquid surface, that is, it cannot read the actual liquid level in the storage tank and sends a signal that the liquid level is zero. When the liquid level in the storage tank is higher than or equal to the second preset threshold, the float floats up and leaves the preset lowest position. The float-type level gauge sends a corresponding liquid level signal according to the position height of the float to measure the actual liquid level in the storage tank in real time.

[0124] In one technical solution of this application, monitoring the actual unloading volume of the pumped tanker truck within a preset time period specifically includes:

[0125] Monitor the flow rate at the unloading end of the tanker truck equipped with a pump;

[0126] Calculate the product of the flow rate value and the preset duration, and use the product as the actual unloading volume.

[0127] For example, a flow monitoring device is provided at the unloading end of the pumped tanker truck. This flow monitoring device can monitor the flow rate of the liquid flowing out of the unloading end of the pumped tanker truck in real time. Based on the flow rate and a preset time, the volume of the liquid unloaded by the pumped tanker truck within the preset time can be obtained.

[0128] In one technical solution of this application, the unloading control method further includes:

[0129] Obtain the initial liquid level in the storage tank;

[0130] Based on the initial liquid level, a judgment scheme is established to determine whether the unloading is abnormal. The judgment scheme specifically includes:

[0131] If the initial liquid level in the storage tank is greater than or equal to the first preset threshold and less than the second preset threshold, the total unloading volume of the pumped tanker and the liquid level in the storage tank are monitored in real time, and it is determined whether the liquid level in the storage tank at the moment when the total unloading volume reaches the preset volume is greater than or equal to the upper limit of the preset range. If yes, the result is normal; if no, the result is abnormal.

[0132] If the initial liquid level in the storage tank is greater than or equal to the second preset threshold and less than the third preset threshold, then the actual unloading volume of the pumped tanker and the actual liquid level increment of the storage tank within the preset time period are monitored. The theoretical liquid level increment is determined based on the actual unloading volume, and it is determined whether the deviation between the theoretical liquid level increment and the actual liquid level increment is less than or equal to a preset value. If yes, the result is normal; otherwise, the result is abnormal.

[0133] For example, in this embodiment, before unloading liquid from the pump truck, the initial liquid level in the storage tank is first obtained. A specific judgment method is determined based on the range of the initial liquid level, thereby improving the accuracy of determining whether the unloading is normal and achieving precise early warning. The specific control methods for when the initial liquid level is greater than or equal to a first preset threshold but less than a second preset threshold, and when it is greater than or equal to a second preset threshold but less than a third preset threshold, are described above and will not be repeated here.

[0134] In one technical solution of this application, the step of determining the filling authority for the storage tank specifically includes:

[0135] Obtain the equipment identifier of the storage tank;

[0136] Based on the device identifier, a matching request is sent to the liquid storage device;

[0137] If the match is successful, it is determined that the tanker truck with pump has the authority to fill the storage tank.

[0138] For example, an electronic identification device is installed in the on-board controller of the pump-tank truck, and an equipment identifier is affixed to the liquid storage tank. This equipment identifier is a unique identifier for the liquid storage equipment, facilitating its identification and management. When the pump-tank truck stops at an unloading point near a legitimate liquid storage tank, the operator can switch the controller to unloading mode, thereby activating the electronic identification device to obtain the equipment identifier of the liquid storage equipment. This identification can be based on LoRa technology, or the operator can manually input the equipment identifier of the liquid storage tank into the electronic identification device, thus identifying the specific liquid storage tank.

[0139] Then, the storage tank and the pump truck can be pre-paired through the management platform. The pre-paired storage tank and the pump truck can be interconnected when specific conditions such as distance are met. Thus, when the pump truck sends a matching request to the storage tank and receives a successful matching response from the storage tank, enabling the storage tank and the pump truck to communicate and interconnect, the pump truck can determine its filling authority for the storage tank.

[0140] The controller for the pump-equipped tanker truck includes at least an electronic identification device, a data processing module, a radio frequency communication module, a communication control module, and an alarm module. The electronic identification device acquires the equipment identifier of the storage tank. Based on the equipment identifier acquired by the electronic identification device, the data processing module determines the filling permission for the storage tank via the radio frequency communication module. If the filling permission is granted, the controller will control the pump-equipped tanker truck to unload the liquid. The communication control module can be used to control communication with the storage tank, illustratively controlling the sending of matching requests, and determining whether a match is successful based on the response to the received matching request. The alarm control module provides an alarm notification in case of abnormal unloading. The flow monitoring device at the unloading end of the pump-equipped tanker truck has a remote transmission function; it is communicatively connected to the controller and can transmit the flow rate value to the controller in real time.

[0141] The storage tank includes at least a tank body, a liquid level monitoring device, and onboard equipment. The onboard equipment, mounted on the tank body, includes at least a storage unit and a communication unit. The storage unit stores a device identifier; the communication unit communicates with the pump-equipped tanker truck based on the device identifier, enabling the truck to determine its filling authority for the storage tank. The liquid level monitoring device is communicatively connected to the onboard equipment, transmitting liquid level data in real time to the onboard equipment and then to the controller of the pump-equipped tanker truck.

[0142] In one technical solution of this application, the control method further includes the step of obtaining equipment parameter information of the liquid storage tank, specifically including: obtaining equipment parameter information of the liquid storage tank when having filling authority.

[0143] In one embodiment, the equipment parameter information includes the volume, shape, or size information of the storage tank. The storage tank is equipped with liquid level monitoring devices of different ranges according to its equipment parameter information. Different liquid level monitoring devices have different measurement blind zones, thus resulting in different settings for parameters such as the first preset threshold, second preset threshold, third preset threshold, fourth preset threshold, and preset duration in the aforementioned control method. In a specific embodiment, the storage tank has a 1m... 3 and 2m 3 Two models are available, each with different preset thresholds, including a first, second, third, and fourth preset thresholds, and a preset duration, set according to different volumes. With filling authority, the system first acquires the equipment parameter information of the storage tank and the initial liquid level within the tank, determines the corresponding anomaly detection method, and then controls the pumped tanker truck to unload. During unloading, the unloading volume of the pumped tanker truck and the liquid level in the storage tank are monitored in real time. Based on the changes in the unloading volume and liquid level in the storage tank, the system determines whether the unloading is abnormal, enabling more accurate unloading control of the pumped tanker truck.

[0144] Based on the same inventive concept, this application provides an unloading control device with a pump truck. Figure 4 This is a schematic diagram of the unloading control device 1 in the embodiments of this application. See also: Figure 4 As shown, the unloading control device 1 includes a memory 10 and a processor 11. The processor 11 and the memory 10 communicate with each other via a bus. The memory 10 stores programs or instructions, and the processor 11 executes the programs or instructions to implement the steps of the unloading control method as described above.

[0145] The control device 1 includes all the beneficial effects of the unloading control method provided in any of the above technical solutions, and will not be repeated here to avoid repetition.

[0146] Based on the same inventive concept, this application provides a tanker truck with a pump. The tanker truck with a pump includes a vehicle body, a tank, and a control device 1 as described above. The tank is mounted on the vehicle body and has a discharge end for discharging liquid. The discharge end is equipped with a flow monitoring device, and the control device is communicatively connected to the tank and the storage tank.

[0147] The pump-equipped tanker truck includes all the beneficial effects of the unloading control method provided in any of the above technical solutions, and will not be repeated here to avoid duplication.

[0148] Based on the same inventive concept, embodiments of this application provide a computer-readable storage medium. This computer-readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the unloading control method described above.

[0149] According to embodiments of this application, the computer-readable storage medium can be a non-volatile computer-readable storage medium. Examples include, but are not limited to: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this disclosure, the computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0150] It should be noted that the descriptions of the above embodiments of the unloading control device, the pumped tanker truck, and the computer-readable storage medium are similar to the descriptions of the above method embodiments. For technical details not disclosed in the embodiments of the control device, the pumped tanker truck, and the computer-readable storage medium of this application, please refer to the descriptions of the method embodiments of this application for understanding.

[0151] Although this application has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Because this application can be embodied in many forms without departing from the spirit or essence of the embodiments, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A method for controlling the unloading of liquid from a tanker truck equipped with a pump, characterized in that, include: Determine the filling permission for the storage tank; if the filling permission is granted, control the unloading of the pumped tanker truck; during the unloading process, monitor the unloading volume of the pumped tanker truck and the liquid level in the storage tank in real time. The unloading process is assessed based on the unloading volume of the pumped tanker and the liquid level changes in the storage tank to determine if the unloading is abnormal. If the assessment result is normal, the pumped tanker continues unloading; if the assessment result is abnormal, then... Control the tanker truck with pump to stop unloading liquid; The system monitors the unloading volume of the pumped tanker truck and the liquid level in the storage tank in real time. Based on these changes, it determines whether the unloading is abnormal. Specifically, this includes: obtaining the initial liquid level in the storage tank; if the initial liquid level in the storage tank is greater than or equal to a first preset threshold but less than a second preset threshold, then the system monitors the total unloading volume of the pumped tanker truck and the liquid level in the storage tank in real time, and determines whether the liquid level in the storage tank at the moment the total unloading volume reaches a preset volume is greater than or equal to the upper limit of a preset range. If yes, the result is considered normal; otherwise, the result is considered abnormal. If the initial liquid level in the storage tank is greater than or equal to a second preset threshold but less than a third preset threshold, then the system monitors the actual unloading volume of the pumped tanker truck within a preset time period and the actual liquid level increment in the storage tank within the preset time period. Based on the actual unloading volume, the system determines the theoretical liquid level increment, and determines whether the deviation between the theoretical liquid level increment and the actual liquid level increment is less than or equal to a preset value. If yes, the result is considered normal; otherwise, the result is considered abnormal. The storage tank is equipped with a float-type level gauge, which includes a float. When the liquid level in the storage tank is lower than the second preset threshold, the float remains at the preset minimum position, and the float-type level gauge sends a signal indicating a zero liquid level. When the liquid level in the storage tank is higher than or equal to the second preset threshold, the float rises away from the preset minimum position, and the float-type level gauge sends a corresponding liquid level signal in response to the position height of the float.

2. The unloading control method according to claim 1, characterized in that, If the initial liquid level in the storage tank is greater than or equal to a first preset threshold but less than a second preset threshold, then after the step of real-time monitoring of the total unloading volume of the pumped tanker and the liquid level in the storage tank, and determining that the liquid level in the storage tank at the moment when the total unloading volume reaches a preset volume is greater than or equal to the upper limit of the preset range, the method further includes: determining whether the current liquid level in the storage tank exceeds a fourth preset threshold, wherein the fourth preset threshold is between the second preset threshold and the third preset threshold; if not, then the following steps are performed: collecting the actual unloading volume of the pumped tanker within a first preset time period and the actual liquid level increment of the storage tank within the first preset time period; determining the first theoretical liquid level increment based on the actual unloading volume within the first preset time period, and determining whether the deviation between the first theoretical liquid level increment and the actual liquid level increment within the first preset time period is less than or equal to a first preset value; if yes, the result is normal; if no, the result is abnormal; collecting the liquid level of the pumped tanker within a second preset time period... The system assumes the actual unloading volume within a given time period and the actual liquid level increment of the storage tank within a second preset time period. Based on the actual unloading volume within the second preset time period, a second theoretical liquid level increment is determined. The system then determines whether the deviation between the second theoretical liquid level increment and the actual liquid level increment within the second preset time period is less than or equal to a second preset value. If yes, the result is considered normal; otherwise, the result is considered abnormal. If yes, the following steps are performed: The system collects the actual unloading volume of the pump truck within a third preset time period and the actual liquid level increment of the storage tank within the third preset time period. Based on the actual unloading volume within the third preset time period, a third theoretical liquid level increment is determined. The system then determines whether the deviation between the third theoretical liquid level increment and the actual liquid level increment within the third preset time period is less than or equal to a third preset value. If yes, the result is considered normal; otherwise, the result is considered abnormal. Wherein, the first preset time period is longer than the second preset time period, and the first preset time period is less than or equal to the third preset time period.

3. The unloading control method according to claim 1, characterized in that, If the initial liquid level in the storage tank is greater than or equal to the second preset threshold but less than the third preset threshold, then The steps of monitoring the actual unloading volume of the pumped tanker truck and the actual liquid level increment of the storage tank within a preset time period, determining the theoretical liquid level increment based on the actual unloading volume, and determining that the deviation between the theoretical liquid level increment and the actual liquid level increment is less than or equal to a preset value specifically include: if the initial liquid level in the storage tank is greater than or equal to a second preset threshold and less than a fourth preset threshold, then collecting the actual unloading volume of the pumped tanker truck within a first preset time period and the actual liquid level increment of the storage tank within the first preset time period; determining the first theoretical liquid level increment based on the actual unloading volume within the first preset time period, and determining whether the deviation between the first theoretical liquid level increment and the actual liquid level increment within the first preset time period is less than or equal to a first preset value; if yes, the result is normal; if no, the result is abnormal; collecting the actual unloading volume of the pumped tanker truck within a second preset time period and the actual liquid level increment of the storage tank within the second preset time period; determining the theoretical liquid level increment based on the actual unloading volume within the second preset time period... The actual unloading volume determines the second theoretical liquid level increment, and it is determined whether the deviation between the second theoretical liquid level increment and the actual liquid level increment within the second preset time period is less than or equal to the second preset value. If yes, the result is considered normal; otherwise, the result is considered abnormal. If the initial liquid level in the storage tank is greater than or equal to the fourth preset threshold and less than the third preset threshold, the actual unloading volume of the pumped tanker truck within the third preset time period and the actual liquid level increment of the storage tank within the third preset time period are collected. The third theoretical liquid level increment is determined based on the actual unloading volume within the third preset time period, and it is determined whether the deviation between the third theoretical liquid level increment and the actual liquid level increment within the third preset time period is less than or equal to the third preset value. If yes, the result is considered normal; otherwise, the result is considered abnormal. Wherein, the fourth preset threshold is between the second preset threshold and the third preset threshold, the first preset time period is greater than the second preset time period, and the first preset time period is less than or equal to the third preset time period.

4. The unloading control method according to claim 1, characterized in that, Monitoring the actual unloading volume of the pumped tanker within a preset time period specifically includes: monitoring the flow rate at the unloading end of the pumped tanker; calculating the product of the flow rate and the preset time period, and using the product as the actual unloading volume.

5. A liquid unloading control device with a pump truck, characterized in that, include: A memory, on which programs or instructions are stored; A processor that executes the program or instructions to implement the steps of the unloading control method as described in any one of claims 1 to 4.

6. A pump truck, characterized in that, include: Vehicle body; A tank body is mounted on the vehicle body, and the tank body is provided with a liquid discharge end for discharging liquid, and the liquid discharge end is provided with a flow monitoring device; And the control device as described in claim 5, wherein the control device is communicatively connected to the tank body and the storage tank.

7. A computer-readable storage medium having a program or instructions stored thereon, characterized in that, When the program or instructions are executed by the processor, they implement the steps of the unloading control method as described in any one of claims 1 to 4.

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