Oil extraction interface conversion device, control method of oil extraction interface conversion device, oil extraction device, oil extraction system and control method of oil extraction system

Abstract

The invention discloses an oil extraction interface conversion device, a control method of the oil extraction interface conversion device, an oil extraction device, an oil extraction system and a control method of the oil extraction system. According to the technical scheme provided by the embodiment of the invention, the oil taking port of the transformer body is converted into two ports from one port through the oil taking port conversion device, so that the oil taking container can be connected in series in the oil taking device, and the oil taking port conversion device can drive the piston through the motor of the electric cylinder; according to the oil extraction device, residual oil in the pipeline in the previous oil extraction process is extracted, so that the pipeline residual oil collected in the oil extraction container of the oil extraction device is reduced, the representativeness of a collected oil sample is improved, and the accuracy of an oil quality analysis result is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of transformer oil extraction, and in particular relates to an oil extraction interface conversion device and a control method thereof, an oil extraction device, an oil extraction system and a control method thereof. Background Art

[0002] Transformers are key equipment within substations, and their operating status is directly related to power grid security. Oil extraction and dissolved gas analysis under power conditions are crucial for identifying transformer operating conditions. Dissolved gas analysis can be performed in two modes: on-site online monitoring and offline laboratory analysis. Online monitoring offers high timeliness but limited reliability, with high rates of false alarms and missed alarms, making it a poor substitute for laboratory analysis when equipment anomalies are suspected. Offline laboratory analysis offers high accuracy, but currently relies primarily on manual sampling at the transformer's oil drain valve. This requires a high level of skill, makes it difficult to ensure sample representativeness, and poses certain safety risks. Therefore, to improve the safety and efficiency of oil extraction operations and ensure the authenticity of oil samples, various robots with oil extraction capabilities have been developed to automatically extract oil. However, the complex piping structure of these automated oil extraction robots can easily lead to the oil being extracted from the oil container containing residual oil samples from the piping. Summary of the Invention

[0003] The purpose of this application is to at least solve the problem in the related art that the oil extraction device easily causes the oil extracted from the oil extraction container to contain oil samples remaining in the pipeline. This purpose is achieved through the following technical solutions:

[0004] A first aspect of the present application provides an oil extraction interface conversion device, characterized in that it includes: a first pipeline, a second pipeline, an electric cylinder, a first electrically controlled valve, a second electrically controlled valve, a third electrically controlled valve, a first interface, and a second interface;

[0005] The first end of the first pipeline is connected to the oil outlet of the transformer, and the second end of the first pipeline is provided with the first interface;

[0006] The first electrically controlled valve is used to adjust the connection between the first pipeline and the oil outlet of the transformer according to a first control signal;

[0007] The electric cylinder includes a motor and a piston. The motor is configured to drive the piston according to a second control signal to change the volume of an inner cavity of the electric cylinder. The inner cavity of the electric cylinder is connected to the first pipeline via a first branch point on the first pipeline. The inner cavity of the electric cylinder is also connected to the second interface via a second pipeline.

[0008] The second electrically controlled valve is used to adjust the connection between the inner cavity of the electric cylinder and the first pipeline according to a third control signal;

[0009] The third electrically controlled valve is used to adjust the connection between the inner cavity of the electric cylinder and the second pipeline according to the fourth control signal;

[0010] The first interface is used to connect with the third interface of the oil extraction device, and the second interface is used to connect with the fourth interface of the oil extraction device. The oil extraction device is used to collect oil samples from the transformer using an oil extraction container arranged in series between the third interface and the fourth interface.

[0011] In some embodiments, the oil extraction interface conversion device further includes at least one of the following component combinations:

[0012] A first component assembly includes: a fuel tank and a fourth electrically controlled valve, wherein an inner cavity of the fuel tank is connected to the first pipeline via a second branch point on the first pipeline, and the second branch point is between the first electrically controlled valve and the first branch point, and the fourth electrically controlled valve is used to adjust the connection between the first pipeline and the fuel tank according to a fifth control signal;

[0013] The second component assembly includes: an electrically controlled three-way valve, a third pipeline, a manual oil extraction interface, and a fifth electrically controlled valve, wherein a first end of the electrically controlled three-way valve is connected to the oil extraction port of the transformer, a second end of the electrically controlled three-way valve is connected to the first end of the first pipeline, a third end of the electrically controlled three-way valve is connected to the first end of the third pipeline, and the second end of the third pipeline is provided with the manual oil extraction interface; the electrically controlled three-way valve is used to guide the oil extraction port of the transformer to connect to the first pipeline or the third pipeline according to a sixth control signal, and the fifth electrically controlled valve is used to adjust the on / off state of the third pipeline according to a seventh control signal;

[0014] a third component assembly comprising: a circulation pump and an oil flow monitoring module disposed in the second pipeline, the circulation pump being configured to push the oil in the second pipeline to flow from the second interface to the electric cylinder in response to an eighth control signal, and the oil flow monitoring module being configured to monitor oil flow circulation parameters in the second pipeline;

[0015] The fourth component combination includes: a vacuum pump and a pressure monitoring module arranged in the first pipeline, the vacuum pump is used to vacuum the first pipeline according to the ninth control signal, and the pressure monitoring module is used to measure the pressure value in the first pipeline.

[0016] In some embodiments, the oil extraction interface conversion device further includes:

[0017] The first control module is connected to each electrically controlled valve in the oil extraction interface conversion device and is used to send a control signal corresponding to each electrically controlled valve in the oil extraction interface conversion device.

[0018] A second aspect of the present application provides an oil extraction device, comprising: a third interface, a fourth interface, a fourth pipeline, and an oil extraction container;

[0019] The two ends of the fourth pipeline are connected to the third interface and the fourth interface respectively; the third interface is used to connect to the first interface of the oil extraction interface conversion device described in any technical solution of the embodiment of the present application, and the fourth interface is used to connect to the second interface of the oil extraction interface conversion device;

[0020] Both ends of the oil collection container are connected to the third interface and the fourth interface respectively, and are used to collect oil samples from the transformer.

[0021] In some embodiments, the oil extraction device further comprises:

[0022] a sixth electrically controlled valve, provided between the third interface and the oil extraction container, for regulating the connection between the third interface and the oil extraction container according to a tenth control signal;

[0023] a fifth pipeline arranged in parallel with the fourth pipeline;

[0024] The seventh electrically controlled valve is provided in the fifth pipeline and is used for regulating the on-off of the fifth pipeline according to the eleventh control signal.

[0025] In some embodiments, the oil extraction device further comprises:

[0026] The second control module is connected to each electrically controlled valve in the oil extraction device and is used to send a control signal corresponding to each electrically controlled valve in the oil extraction device.

[0027] The third aspect of the present application provides an oil extraction system, comprising:

[0028] The oil extraction interface conversion device according to any technical solution of the embodiment of the present application is used to convert the oil extraction port of the transformer into a first interface and a second interface;

[0029] An oil extraction robot includes a robotic arm and the oil extraction device described in any technical solution of the embodiments of the present application, wherein the oil extraction device is mounted on the robotic arm, and the oil extraction robot is used to control the movement of the robotic arm to dock the third interface of the oil extraction device with the first interface, and to dock the fourth interface of the oil extraction device with the second interface.

[0030] A fourth aspect of the present application provides a control method for an oil extraction interface conversion device, which is applied to the oil extraction interface conversion device described in any technical solution of the embodiments of the present application, comprising:

[0031] receiving a docking signal from an oil extraction device, wherein the docking signal indicates that the oil extraction device has been docked with the oil extraction interface conversion device;

[0032] Controlling the first electrically controlled valve, the second electrically controlled valve and the third electrically controlled valve of the oil extraction interface conversion device to open;

[0033] The motor of the electric cylinder of the oil extraction interface conversion device is controlled to pull the piston to the first position.

[0034] In some embodiments, after controlling the motor of the electric cylinder of the oil extraction interface conversion device to pull the piston to a preset position, the method further includes:

[0035] If it is determined that the oil extraction stop condition is met, the first electronically controlled valve is controlled to close;

[0036] controlling the motor to pull the piston to a second position; when the piston is in the second position, the inner cavity volume of the electric cylinder is greater than the inner cavity volume of the electric cylinder when the piston is in the first position;

[0037] controlling the third electrically controlled valve to close, and controlling the first electrically controlled valve to open;

[0038] The motor is controlled to push the piston to a third position; when the piston is at the third position, the inner cavity volume of the electric cylinder is less than or equal to the inner cavity volume of the electric cylinder when the piston is at the first position.

[0039] A fifth aspect of the present application provides a control method for an oil extraction system, which is applied to the oil extraction system described in any technical solution of the embodiments of the present application. The oil extraction system includes an oil extraction interface conversion device and an oil extraction robot. The method includes:

[0040] The oil extraction robot controls the movement of the mechanical arm to dock the third interface of the oil extraction device with the first interface of the oil extraction interface conversion device, and dock the fourth interface of the oil extraction device with the second interface of the oil extraction interface conversion device;

[0041] The oil extraction device sends a docking signal to the oil extraction interface conversion device, wherein the docking signal indicates that the oil extraction device has been docked with the oil extraction interface conversion device;

[0042] The oil extraction interface conversion device receives the docking signal;

[0043] The oil extraction interface conversion device controls the first electrically controlled valve, the second electrically controlled valve and the third electrically controlled valve to open;

[0044] The oil extraction interface conversion device controls the motor of the electric cylinder to pull the piston to the first position.

[0045] The oil extraction interface conversion device and its control method, the oil extraction device, the oil extraction system and its control method described in any technical solution of the embodiments of the present application convert the oil extraction port of the transformer body from one interface to two interfaces through the oil extraction interface conversion device, so that the oil extraction container can be connected in series in the oil extraction device, and the oil extraction interface conversion device can drive the piston through the motor of the electric cylinder to extract the oil remaining in the pipeline during the previous oil extraction process, thereby reducing the residual oil in the pipeline collected in the oil extraction container of the oil extraction device, improving the representativeness of the collected oil sample, and thereby improving the accuracy of the oil quality analysis results. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0047] Figure 1 This is a structural diagram of an oil extraction device and an oil extraction interface conversion device provided in an embodiment of the present application;

[0048] Figure 2 This is a structural diagram of another oil extraction device and oil extraction interface conversion device provided in an embodiment of the present application;

[0049] Figure 3 This is a flow chart of a control method for an oil extraction interface conversion device provided in an embodiment of the present application;

[0050] Figure 4 It is a flow chart of a control method of an oil extraction system provided in an embodiment of the present application.

[0051] Some of the reference numerals are as follows:

[0052] 1. Transformer, 2. Oil extraction interface conversion device, 3. Oil extraction device, 4. Oil drain valve, 5. Oil impurity filter, 6. Three-way electric control valve, 7. First electric control valve, 8. Fourth electric control valve, 9. Oil tank, 10. Liquid level sensor, 11. Second electric control valve, 12. Third electric control valve, 13. Electric cylinder, 14. Motor, 15. Pressure monitoring module, 16. Vacuum pump, 17. Oil pressure monitoring module, 18. Circulation pump, 19. Fifth electric control valve, 20. Manual oil extraction interface, 21. First interface, 22. Second interface, 23. Third interface, 24. Fourth interface, 25. Seventh electric control valve, 26. Sixth electric control valve, 27. Oil extraction container, 301. First oil port, 302. Second oil port. DETAILED DESCRIPTION

[0053] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0054] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0055] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0056] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "below" another element or feature would then be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein are interpreted accordingly.

[0057] like Figure 1 As shown, according to an embodiment of the present application, an oil extraction interface conversion device 2 is proposed, comprising: a first pipeline 101, a second pipeline 102, an electric cylinder 13, a first electrically controlled valve 7, a second electrically controlled valve 11, a third electrically controlled valve 12, a first interface 21, and a second interface 22. The first interface 21 is configured to interface with the third interface 23 of the oil extraction device 3, and the second interface 22 is configured to interface with the fourth interface 24 of the oil extraction device 3. The oil extraction device 3 is configured to collect oil samples from the transformer 1 using an oil extraction container 27 connected in series between the third interface 23 and the fourth interface 24. It should be noted that any of the electrically controlled valves described in the embodiments of the present application may alternatively be a solenoid valve.

[0058] refer to Figure 1 The first end of the first pipeline 101 is connected to the oil inlet of the transformer 1, and the second end of the first pipeline 101 is provided with a first interface 21. The first electrically controlled valve 7 is used to adjust the flow between the first pipeline 101 and the oil inlet of the transformer 1 according to a first control signal. The electric cylinder 13 includes a motor 14 and a piston. The motor 14 is used to drive the piston according to a second control signal to change the volume of the inner cavity of the electric cylinder 13. The inner cavity of the electric cylinder 13 is connected to the first pipeline 101 via a first branch point 1011 on the first pipeline 101. The inner cavity of the electric cylinder 13 is also connected to the second interface 22 via a second pipeline 102. The second electrically controlled valve 11 is used to adjust the flow between the inner cavity of the electric cylinder 13 and the first pipeline 101 according to a third control signal. The third electrically controlled valve 12 is used to adjust the flow between the inner cavity of the electric cylinder 13 and the second pipeline 102 according to a fourth control signal.

[0059] The oil extraction interface conversion device described in any technical solution of the embodiments of the present application converts the oil extraction port of the transformer body from one interface to two interfaces through the oil extraction interface conversion device, so that the oil extraction container can be connected in series in the oil extraction device. In addition, the oil extraction interface conversion device can drive the piston through the motor of the electric cylinder to extract the oil remaining in the pipeline from the previous oil extraction process, thereby reducing the residual oil in the pipeline collected in the oil extraction container of the oil extraction device, improving the representativeness of the collected oil sample, and thereby improving the accuracy of the oil quality analysis results.

[0060] refer to Figure 2 In some embodiments, the oil extraction interface conversion device 2 may further include at least one of the following component combinations:

[0061] The first component combination includes: an oil tank 9 and a fourth electrically controlled valve 8. The inner cavity of the oil tank 9 is connected to the first pipeline 101 through the second branch point 1012 on the first pipeline 101, and the second branch point 1012 is between the first electrically controlled valve 7 and the first branch point 1011. The fourth electrically controlled valve 8 is used to adjust the on-off between the first pipeline 101 and the oil tank 9 according to the fifth control signal.

[0062] The oil tank 9 in the first component assembly can be used to store the oil in the electric cylinder 13, specifically, residual oil from a previous operation. Specifically, before performing the current oil sampling, the piston can be pulled to draw residual oil from the pipeline into the electric cylinder 13. The first and third electrically controlled valves 7 and 12 are then closed, and the piston is pushed to drain the residual oil drawn from the electric cylinder 13 into the oil tank 9. This allows the oil tank 9 to collect waste oil, reducing the internal volume required by the electric cylinder 13 and minimizing the amount of waste oil involved in subsequent oil sampling cycles.

[0063] The second component assembly includes an electrically controlled three-way valve 6, a third pipeline 103, a manual oil extraction interface 20, and a fifth electrically controlled valve 19. The first end of the electrically controlled three-way valve 6 is connected to the oil extraction port of the transformer 1, the second end of the electrically controlled three-way valve 6 is connected to the first end of the first pipeline 101, and the third end of the electrically controlled three-way valve 6 is connected to the first end of the third pipeline 103. The second end of the third pipeline 103 is provided with the manual oil extraction interface 20. The electrically controlled three-way valve 6 is used to direct the oil extraction port of the transformer 1 to connect to the first pipeline 101 or the third pipeline 103 based on a sixth control signal. The fifth electrically controlled valve 19 is used to adjust the on / off state of the third pipeline 103 based on a seventh control signal.

[0064] The second component combination transforms the oil extraction port of the transformer 1 into two types of ports through the manual oil extraction interface 20, which allows both manual and automatic oil extraction, thereby improving the flexibility of the oil extraction method.

[0065] The third component combination includes: a circulation pump 18 and an oil flow monitoring module 17 arranged in the second pipeline 102, the circulation pump 18 is used to push the oil in the second pipeline 102 from the second interface 22 to the electric cylinder 13 according to the eighth control signal, and the oil flow monitoring module 17 is used to monitor the oil flow circulation parameters in the second pipeline 102.

[0066] The circulation pump 18 of the third component combination is used to increase the circulation power of the oil flow in the pipeline, which helps to discharge the residual oil. It can also increase the circulation speed during the oil extraction process and speed up the sampling process. Combined with the monitoring results of the oil flow monitoring module 17, it can assist in the control of the circulation pump 18, and control whether the circulation pump 18 is turned on and the power set after it is turned on according to the oil flow circulation parameters.

[0067] The fourth component combination includes: a vacuum pump 16 and a pressure monitoring module 15 arranged in the first pipeline 101, the vacuum pump 16 is used to vacuum the first pipeline 101 according to the ninth control signal, and the pressure monitoring module 15 is used to measure the pressure value in the first pipeline 101, which can specifically be a vacuum gauge.

[0068] The fourth component assembly allows for an oil line air-tightness check after successful docking and before any oil extraction operations are performed to verify the tightness of the pipeline connection. Specifically, after the vacuum pump 16 evacuates the system, the pressure monitoring module 15 monitors the pressure within the pipeline. If the pressure remains unchanged for a period of time, the oil line air-tightness check is considered passed, and subsequent steps can be continued. This prevents oil sample leakage caused by loose pipeline connections, thereby improving sampling safety.

[0069] In some embodiments, the oil extraction interface conversion device may further include a first control module. Specific implementations of the first control module include, but are not limited to, a central processing unit (CPU), an embedded chip, a system-on-chip (SOC), and the like. The first control module is connected to each electronically controlled valve in the oil extraction interface conversion device, using either a wired or wireless communication connection, to issue corresponding control signals to each electronically controlled valve. Optionally, the first control module may implement the control method for the oil extraction interface conversion device provided in any of the technical solutions of the embodiments of this application.

[0070] The control method of the oil extraction interface conversion device provided in the embodiment of the present application can be applied to the oil extraction interface conversion device provided in any technical solution of the embodiment of the present application. Figure 3 , the method comprises the following steps:

[0071] Step 31: Receive a docking signal from the oil extraction device.

[0072] Step 32, controlling the first electrically controlled valve, the second electrically controlled valve, and the third electrically controlled valve of the oil extraction interface conversion device to open;

[0073] Step 33: Control the motor of the electric cylinder of the oil extraction interface conversion device to pull the piston to the first position.

[0074] The docking signal indicates that the oil extraction device has docked with the oil extraction interface conversion device. The oil extraction device can utilize a robotic arm, a combination of a robotic arm and a fixed platform / mobile platform, or a mobile robotic arm to dock the interface in the oil extraction device with the interface in the oil extraction interface conversion device, thereby establishing a loop connection between the oil extraction interface conversion device and the pipeline in the oil extraction device. The oil extraction device can send a docking signal to the oil extraction interface conversion device to inform the oil extraction interface conversion device that the oil extraction device and the oil extraction interface conversion device have been docked. To achieve oil extraction, the first, second and third electrically controlled valves of the oil extraction interface conversion device can be controlled to open, and then the motor of the electric cylinder of the oil extraction interface conversion device can be controlled to pull the piston to the first position. Under the action of oil pressure, the oil in the transformer body enters the electric cylinder through the first pipeline, the third pipeline and the second pipeline, thereby pumping the residual oil in the pipeline and valve during the previous oil extraction process into the oil cylinder, reducing the amount of residual oil in the oil extraction container connected in series in the third pipeline, ensuring that fresh oil samples are obtained from the transformer body, improving the representativeness of the collected oil samples, and thereby improving the accuracy of the oil quality analysis results.

[0075] In some embodiments, reference Figure 3 After executing step 33 to control the motor of the electric cylinder of the oil extraction interface conversion device to pull the piston to a preset position, the method further includes executing the following steps:

[0076] Step 34: If it is determined that the oil extraction stop condition is met, the first electronically controlled valve is controlled to close;

[0077] Step 35, controlling the motor to pull the piston to the second position;

[0078] Step 36, controlling the third electrically controlled valve to close, and controlling the first electrically controlled valve to open;

[0079] Step 37: Control the motor to push the piston to the third position.

[0080] Conditions for stopping oil extraction include, but are not limited to, reaching a preset fixed duration; or, based on real-time monitored oil flow circulation parameters in the pipeline, determining whether the oil flow circulation condition has reached the oil flow condition for stopping oil extraction; or, based on the monitored oil flow circulation parameters in the pipeline, estimating the time required to stop oil extraction, and determining that the oil extraction condition has been met after the calculated estimated time has been reached. After determining that the oil extraction condition has been met, the first electronically controlled valve is controlled to close, stopping oil circulation in the pipeline.

[0081] When the piston is in the second position, the internal volume of the electric cylinder is greater than when it is in the first position. Pulling the piston to the second position, where the cylinder volume is larger, increases the oil pressure, drawing any remaining oil in the pipeline into the internal volume of the electric cylinder, thereby reducing the amount of residual oil in the pipeline from this oil extraction. Next, the third electrically controlled valve is controlled to close, while the first electrically controlled valve is controlled to open. The motor is then controlled to push the piston to the third position. When the piston is in the third position, the internal volume of the electric cylinder is equal to or less than when the piston is in the first position. This operation pushes any relatively fresh oil remaining in the pipeline and valves during this oil extraction process back into the transformer, preventing an excessive reduction in the transformer's oil volume, reducing waste, and minimizing the impact of oil sampling on the transformer's normal operation.

[0082] refer to Figure 1 The embodiment of the present application further provides an oil extraction device 3 , comprising: a third interface 23 , a fourth interface 24 , a fourth pipeline 104 , and an oil extraction container 27 .

[0083] The two ends of the fourth pipeline 104 are respectively connected to the third interface 23 and the fourth interface 24. The third interface 23 is used to dock with the first interface 21 of the oil extraction interface conversion device 2 provided by any technical solution of the embodiment of the present application. The fourth interface 24 is used to dock with the second interface 22 of the oil extraction interface conversion device 2. The two ends of the oil extraction container 27 are respectively connected to the third interface 23 and the fourth interface 24 for collecting oil samples of the transformer 1.

[0084] The oil extraction device provided in the embodiment of the present application has a simple structure. A loop is formed through two interfaces and an oil extraction interface conversion device. The oil extraction container is connected in series in the loop, so that the oil extraction container can participate in the loop circulation. The residual oil in the pipeline that flows into the oil extraction container first is pushed out by the fresh oil sample that flows in later, reducing the amount of residual oil in the pipeline collected in the oil extraction container, improving the representativeness of the collected oil sample, and thereby improving the accuracy of the oil quality analysis results.

[0085] In some embodiments, reference Figure 3 The oil extraction device 3 further includes: a sixth electrically controlled valve 26 , a fifth pipeline 105 and a seventh electrically controlled valve 25 .

[0086] a sixth electrically controlled valve 26, provided between the third interface 23 and the oil extraction container 27, for regulating the connection between the third interface 23 and the oil extraction container 27 according to the tenth control signal;

[0087] a fifth pipeline 105 arranged in parallel with the fourth pipeline 104;

[0088] The seventh electrically controlled valve 25 is provided in the fifth pipeline 105 and is used for regulating the on-off of the fifth pipeline 105 according to the eleventh control signal.

[0089] It is understood that the fourth pipeline 104 and the fifth pipeline 105 are connected in parallel. Optionally, more pipelines can be set in parallel with the fourth pipeline 104 and the fifth pipeline 105, and the parallel pipelines are the same as the fourth pipeline 104, so that more oil collection containers can be set in the oil collection device 3. By controlling the electric control valve, oil samples of different transformers can be collected in different oil collection containers, which is convenient for operation. In some embodiments, each oil collection container is detachable. Figure 2 The oil collection container 27 is detachably connected to the fourth pipeline 104 through the first oil port 301 and the second oil port 302. In this way, after oil sampling, the oil collection container can be directly disassembled for subsequent oil chromatography detection, without the need to re-introduce the oil sample in the oil collection container into another detection container, thereby improving the convenience of oil sample transfer and detection operations, and making it easy to replace different oil collection containers. There is no need to clean and empty the oil collection container in the oil collection device, which simplifies the oil collection process while ensuring high representativeness of the oil sample and improves the oil collection efficiency.

[0090] In some embodiments, the oil extraction device may further include a second control module, which is connected to each electrically controlled valve in the oil extraction device and is configured to send corresponding control signals to each electrically controlled valve in the oil extraction device.

[0091] The present application also provides an oil extraction system, including:

[0092] The oil extraction interface conversion device provided by any technical solution of the embodiment of the present application is used to convert the oil extraction port of the transformer into a first interface and a second interface;

[0093] An oil extraction robot includes a robotic arm and an oil extraction device provided by any technical solution of the embodiments of the present application. The oil extraction device is mounted on the robotic arm. The oil extraction robot is used to control the movement of the robotic arm to dock the third interface of the oil extraction device with the first interface, and to dock the fourth interface of the oil extraction device with the second interface.

[0094] Accordingly, an embodiment of the present application further provides a control method for an oil extraction system, which is applied to the oil extraction system provided in an embodiment of the present application. The oil extraction system includes an oil extraction interface conversion device and an oil extraction robot. The method includes the following steps:

[0095] Step 401: The oil extraction robot controls the movement of the mechanical arm to dock the third interface of the oil extraction device with the first interface of the oil extraction interface conversion device, and dock the fourth interface of the oil extraction device with the second interface of the oil extraction interface conversion device;

[0096] Step 402: The oil extraction device sends a docking signal to the oil extraction interface conversion device, where the docking signal indicates that the oil extraction device has been docked with the oil extraction interface conversion device.

[0097] Step 403: The oil extraction interface conversion device receives a docking signal;

[0098] Step 404: the oil extraction interface conversion device controls the first electrically controlled valve, the second electrically controlled valve, and the third electrically controlled valve to open;

[0099] Step 405: The oil extraction interface conversion device controls the motor of the electric cylinder to pull the piston to the first position.

[0100] It can be understood that the specific implementation methods and beneficial effects of the oil extraction system and the control method of the oil extraction system provided in the embodiments of the present application can be referred to the relevant descriptions of the oil extraction device, the oil extraction interface conversion device and the control method thereof provided in the embodiments of the present application, and will not be repeated here.

[0101] To provide a more detailed implementation, the following Figure 2 The oil extraction interface conversion device 2 and the oil extraction device 3 shown are used to specifically illustrate the technical solution provided in the embodiment of the present application.

[0102] There is an oil extraction robot in the prior art. Although it can replace manual labor and fully automate oil extraction operations, it still has the following shortcomings: ① When modifying the transformer's oil extraction port, a manual oil extraction port is not installed, which does not facilitate manual oil extraction operations; ② The ease of transferring the oil sample after oil extraction is completed is not considered, which is not conducive to subsequent oil chromatography testing; ③ The oil circuit system on the robot is relatively complex, the operation process is cumbersome, increasing the risk of leakage and oil extraction failure, and requiring a high load capacity for the robot. ④ After completing an oil extraction operation, the robot usually needs to replace the oil extraction container or empty the oil sample in the container before it can perform the next task, which reduces the efficiency of the robot's oil extraction operation. Therefore, a more convenient, reliable, and efficient transformer oil sampling device and method suitable for automated oil sampling operations by robots is needed. To address the problems of inconsistent oil extraction ports on existing transformers, complex operation of automatic oil extraction devices, easily contaminated and non-representative oil samples, and excessive oil loss in the transformer body caused by oil extraction operations, the following specific implementation is provided.

[0103] refer to Figure 2 The oil sampling interface conversion device 2 is used to draw out the oil sample from the transformer 1 body. It is worth noting that, as one of the outstanding substantive features of this application, by modifying the oil sampling ports of the transformer 1 of different sizes, different valves and different positions, standardized docking interfaces are provided for automatic oil sampling by robots and manual oil sampling respectively.

[0104] The oil extraction interface conversion device 2 comprises a first oil circuit system, a first control module, a first communication module, and a monitoring module. The first oil circuit system of the oil extraction interface conversion device 2 connects to the oil extraction port of the transformer 1 via the transformer's oil drain valve 4 and oil impurity filter 5. This system is used to extract oil samples from the transformer 1, providing a standardized interface for both automatic and manual oil extraction. The first control module controls the first oil circuit system to coordinate with the oil extraction robot to complete the oil extraction operation. The first communication module establishes a communication connection with the second communication module of the oil extraction device 3, enabling information exchange between the two devices. It can also establish a communication connection with a backend server to transmit operational status data of the oil extraction interface conversion device 2 to the server. Specific implementations of the first communication module may include, but are not limited to, Wi-Fi, Bluetooth, Zigbee, 4G, and 5G modules. The monitoring module monitors the oil circuit's air pressure and oil circulation. The monitoring module may include a pressure monitoring module 15 and an oil flow monitoring module 17. The monitoring module monitors changes in the oil circuit's vacuum level and the oil circulation status.

[0105] The oil extraction device 3 is used to automatically dock with the oil extraction interface conversion device 2 to obtain fresh oil samples from the transformer 1 body. The oil extraction device 3 in the embodiment of the present application can be mounted on an oil extraction robot, and the specific structural form of the oil extraction robot is a multi-legged robot. The oil extraction device 3 includes: a second oil circuit system, a second control module, and a second communication module. The second oil circuit system is connected to the first oil circuit system in the oil extraction interface conversion device 2, and is used to obtain fresh oil samples from the transformer 1 body, so as to facilitate the subsequent detection of dissolved gas in the oil. The second control module is used to control the oil extraction device 3 to reach the vicinity of the oil extraction interface conversion device 2 to complete the docking operation, and to control the second oil circuit system to complete the oil extraction operation. The second communication module establishes a communication connection with the first communication module, is used to exchange information between the oil extraction interface conversion device 2 and the oil extraction device 3, and establishes a communication connection with the background server, is used to receive oil extraction tasks and send the completion status of the oil extraction operation.

[0106] Specifically, the first oil circuit system includes a first pipeline 101 (automatic oil extraction pipeline), a second pipeline 102 (return oil pipeline), a third pipeline 103 (manual oil extraction pipeline), an oil tank 9 (waste oil chamber), an electric cylinder 13 (oil cylinder), a first interface 21, a second interface 22 and a manual oil extraction interface 20.

[0107] The first pipeline 101 is provided with: a three-way electrically controlled valve 6, a first electrically controlled valve 7, a pressure monitoring module 15 (vacuum gauge), and a vacuum pump 16. The first end of the three-way electrically controlled valve 6 is connected to the impurity filter 5, and the second end of the three-way electrically controlled valve 6 is connected in series with the first electrically controlled valve 7, the pressure monitoring module 15, and the vacuum pump 26. The other end of the vacuum pump 16 is connected to the first interface 21. The second pipeline 102 is provided with: an oil flow monitoring module 17 (oil flow monitoring relay) and a circulation pump 18. The first end of the oil flow monitoring relay 17 is connected to the electric cylinder 13 through the third electrically controlled valve 12, and the other end is connected to the circulation pump 18 and the second interface 22 in sequence. The third pipeline 103 is provided with: a fifth electrically controlled valve 19; the first end of the fifth electrically controlled valve 19 is connected to the third end of the three-way electrically controlled valve 6, and the other end is connected to the manual oil extraction interface 20.

[0108] The waste oil chamber is a waste oil barrel, which may be provided with a liquid level sensor 10 and connected to the first pipeline 101 through the fourth electronically controlled valve 8 .

[0109] The electric cylinder 13 is connected to the first pipeline 101 through the second electronically controlled valve 11, and is connected to the second pipeline 102 through the third electronically controlled valve 12; a piston is provided inside the electric cylinder 13, which fits tightly inside the cylinder and is also connected to a piston rod, the other end of which is connected to the motor 14, which can control the movement of the piston and adjust the volume of the internal cavity of the cylinder; a displacement sensor is also provided inside the cylinder for accurately obtaining the position information of the piston in the cylinder.

[0110] The manual oil extraction interface 20 is used to extract the oil sample from the transformer 1 when manually extracting the oil sample, and is connected to the manual oil extraction device through a pipeline.

[0111] The first control module may include a microprocessor chip and a motor control chip. The first control module is connected to the three-way electrically controlled valve 6, the first electrically controlled valve 7, the fourth electrically controlled valve 8, the second electrically controlled valve 11, the third electrically controlled valve 12, and the fifth electrically controlled valve 19 within the first oil circuit system, and is used to control the on / off states of the first and second pipelines 101, 102. The first control module is also connected to the drive for the vacuum pump 16, the drive for the circulating pump 18, and the drive for the motor 14, and is used to control the start and stop of the vacuum pump 16, the start and stop of the circulating pump 18, and the rotation direction and start and stop of the motor 14. The first control module is connected to the first communication module for information exchange with the oil extraction device 3. The first control module is also connected to the monitoring module to receive information on the air pressure and oil circulation status within the oil circuit.

[0112] The second oil circuit system includes a fifth pipeline 105, a fourth pipeline 104, a third port 23, and a fourth port 24. The fifth pipeline 105 is equipped with a seventh electrically controlled valve 25, whose first end is connected to the third port 23 and whose second end is connected to the fourth port 24. The fourth pipeline 104 is equipped with a sixth electrically controlled valve 26, a first oil port 301, a second oil port 302, and a detachable oil collection container 27. The first end of the seventh electrically controlled valve 25 is connected to the third port 23, and its second end is connected, in that order, to the first oil port 301, the detachable oil collection container 27, the second oil port 302, and the fourth port 24.

[0113] It is worth noting that the use of a detachable oil collection container 27 is one of the outstanding substantive features of this application. The use of a detachable oil collection container 27 can facilitate the transfer of oil samples and avoid contamination of the oil samples. In a preferred but non-restrictive embodiment of this application, the detachable oil collection container 27 adopts a plunger structure, with an oil inlet (first oil port 301) and an oil outlet (second oil port 302). The oil of the transformer 1 flows through the oil inlet under its own weight and is injected into the container, pushing the plunger to move to the oil outlet. The oil sample flows out of the oil outlet and is injected into the oil cylinder through the second pipeline 102. When the oil sample in the oil collection container 27 is completely a fresh oil sample in the transformer 1 body, the sampling is completed. The oil collection container 27 can be directly disassembled for subsequent oil chromatography testing, which improves the convenience of oil sample transfer, simplifies the oil collection process while ensuring high representativeness of the oil sample, and improves the oil collection efficiency.

[0114] It is worth noting that, as one of the outstanding substantive features of this application, without changing the oil extraction operation process, e.g. Figure 2 As shown, multiple detachable oil collection containers are connected in parallel, and after completing multiple oil collection tasks, they can return to a safe area to transfer oil samples, thereby improving the efficiency of automatic oil collection operations.

[0115] The second control module may include a microprocessor chip and a motor control chip. The second control module is connected to the seventh electrically controlled valve 25 and the sixth electrically controlled valve 26 in the second oil circuit system to control the on / off status of the fifth pipeline 105 and the fourth pipeline 104. Specific implementations of the second communication module may include, but are not limited to, a Wi-Fi module, a Bluetooth module, a ZigBee module, a 4G module, and a 5G module.

[0116] refer to Figure 4 The present invention provides a method for controlling an oil sampling system for automatically sampling oil, comprising the following steps:

[0117] Step 1: Connect the oil extraction interface conversion device 2 to the oil drain valve 4 on the transformer body 1 through the oil impurity filter 5, and the oil drain valve 4 is in a normally open state.

[0118] In step 2, the oil extraction device 3 is connected to the first interface 21 and second interface 22 of the oil extraction interface conversion device via the third interface 23 and the fourth interface 24. After successful connection, the oil extraction interface conversion device 2 performs an oil circuit air tightness test to confirm whether the test is successful. If the test is successful, the oil extraction interface conversion device 2 sends an air tightness test success signal to the oil extraction device 3, and the process continues to step 3. If the air tightness test is unsuccessful, the oil extraction interface conversion device 2 sends an alarm signal to the oil extraction device 3, and the oil extraction device 3 attempts to reconnect until the air tightness test is successful.

[0119] Specifically, before the oil extraction device 3 and the oil extraction interface conversion device 2 are successfully docked, the three-way electrically controlled valve 6 in the oil extraction interface conversion device 2 is in a state that connects the oil drain valve 4 of the transformer 1 body with the third pipeline 103 of the oil extraction interface conversion device 2, and controls the first electrically controlled valve 7, the fourth electrically controlled valve 8, the second electrically controlled valve 11, the third electrically controlled valve 12 and the fifth electrically controlled valve 19 to be in a closed state.

[0120] After the oil extraction device 3 completes the docking operation, it opens the seventh electrically controlled valve 25 and sends a docking completion signal to the oil extraction interface conversion device 2. Next, the vacuum pump 16 within the oil extraction interface conversion device 2 evacuates the first pipeline 101, the second pipeline 102, and the fifth pipeline 105. The monitoring module obtains the pressure value detected by the pressure monitoring module 15 (vacuum gauge). If the pressure value falls below a preset value, the vacuum pump 16 is turned off. If the vacuum gauge pressure value does not change within one minute, the airtightness test of the oil extraction device 3 and the oil extraction interface conversion device 2 has been successful, and step three can be continued.

[0121] In step three, after draining the residual oil from the first oil circuit system and the second oil circuit system, the oil extraction device 3 obtains a representative oil sample from the transformer 1 body through the oil extraction interface conversion device 2 to prevent the oil sample retained in the detachable oil extraction container 27 from containing the oil sample remaining in the pipeline and valve during the previous sampling process.

[0122] First, the second, third, and seventh electrically controlled valves 11, 12, and 25 are controlled to open, and the motor 14 is controlled to pull the piston in the electric cylinder 13 to the first position. The remaining oil sample from the previous sampling in the pipeline enters the cylinder. After the first control module receives a signal from the cylinder stroke sensor and confirms that the first position has been reached, it shuts down the motor 14. Then, the second control module controls the closing of the seventh electrically controlled valve 25, the closing of the third electrically controlled valve 12, and the opening of the fourth electrically controlled valve 8. The motor 14 then drives the piston to discharge all the oil sample in the cylinder into the waste oil chamber. The liquid level sensor 10 monitors whether the waste oil chamber is full and sends an alarm signal to the backend server via the first communication module, alerting the backend server of this situation. After the first control module receives a signal from the cylinder stroke sensor and confirms that the cylinder has been drained, it shuts down the motor 14, closes the fourth and third electrically controlled valves 8, and completes the discharge of the remaining oil sample from the previous sampling.

[0123] Then, the second control module controls the opening of the sixth electrically controlled valve 26. The first control module sequentially performs the following controls: It controls the three-way electrically controlled valve 6 to switch the path, connecting the oil drain valve 4 of the transformer 1 with the first pipeline 101. It drives the motor 14 to pull the oil cylinder piston to the second position, opening the third electrically controlled valve 12 and the first electrically controlled valve 7. Under the action of oil pressure, the oil in the transformer 1 flows through the first pipeline 101, the first port 21, and the third port 23 into the detachable oil collection container 27, and then into the oil cylinder through the second pipeline 102. The oil flow monitoring module 17 in the monitoring module monitors the oil circulation in the pipeline. After a preset time, the "dead oil" remaining in the pipeline and valve circulates into the oil cylinder, and the detachable oil collection container 27 obtains a fresh oil sample from the transformer 1.

[0124] Step 4: After the oil extraction is completed, the oil sample in the pipeline of the oil extraction interface conversion device 2 and the oil extraction device 3 is returned to the transformer 1 body.

[0125] First, the second control module closes the sixth electrically controlled valve 26 to cut off the fourth pipeline 104, opens the seventh electrically controlled valve 25 to open the fifth pipeline 105, and the first control module closes the first electrically controlled valve 7, opens the third electrically controlled valve 12, drives the motor 14 to pull the piston of the electric cylinder 13 to the third position, and starts the circulation pump 18. After a certain period of time, all the oil samples remaining in the oil circuit and valve during this oil extraction process can be circulated and discharged to the electric cylinder 13.

[0126] Then, the second control module closes the seventh electrically controlled valve 25, the first control module closes the third electrically controlled valve 12, opens the first electrically controlled valve 7 and the second electrically controlled valve 11, and drives the motor 14 to push the oil cylinder piston to return the oil sample to the transformer 1 body, avoiding waste of oil sample and reduction of oil volume during the oil extraction process.

[0127] Finally, the first control module closes the first electrically controlled valve 7 and the second electrically controlled valve 11, and switches the three-way electrically controlled valve 6 to a state where the oil drain valve 4 of the transformer 1 body and the third pipeline 103 of the oil extraction interface conversion device 2 are in conduction, facilitating manual sampling operations.

[0128] Step 5: The oil sampling robot equipped with the oil sampling device 3 moves to a safe area and delivers the oil sample. The staff removes the detachable oil sampling container 27 and places a new container. The automatic oil sampling step is completed.

[0129] The embodiment of the present application transforms and unifies the transformer oil outlet with an oil extraction interface conversion device 2, which can realize flexible switching between automatic oil extraction and manual oil extraction modes, simplify the difficulty of automatic oil extraction operation, ensure that the automatic oil extraction oil sample is representative, and reduce the oil loss of the transformer 1 body due to the automatic oil extraction operation.

[0130] The above are merely preferred embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. An oil extraction interface conversion device, characterized in that: include: A first pipeline, a second pipeline, an electric cylinder, a first electrically controlled valve, a second electrically controlled valve, a third electrically controlled valve, a first interface, and a second interface; The first end of the first pipeline is connected to the oil inlet of the transformer, and the second end of the first pipeline is provided with the first interface; The first electrically controlled valve is used to adjust the connection between the first pipeline and the oil inlet of the transformer according to the first control signal; The electric cylinder comprises: a motor and a piston, wherein the motor is used to drive the piston according to a second control signal to change the volume of the inner cavity of the electric cylinder, the inner cavity of the electric cylinder is connected to the first pipeline through a first branch point on the first pipeline, and the inner cavity of the electric cylinder is also connected to the second interface through the second pipeline; The second electrically controlled valve is used to adjust the connection and disconnection between the inner cavity of the electric cylinder and the first pipeline according to a third control signal; The third electrically controlled valve is used to adjust the connection and disconnection between the inner cavity of the electric cylinder and the second pipeline according to a fourth control signal; The first interface is used to connect with the third interface of the oil extraction device, and the second interface is used to connect with the fourth interface of the oil extraction device. The oil extraction device is used to collect the oil sample of the transformer using an oil extraction container arranged in series between the third interface and the fourth interface.

2. The oil extraction interface conversion device according to claim 1, characterized in that: Also includes at least one of the following component combinations: A first component combination includes: an oil tank and a fourth electrically controlled valve, wherein an inner cavity of the oil tank is connected to the first pipeline through a second branch point on the first pipeline, and the second branch point is between the first electrically controlled valve and the first branch point, and the fourth electrically controlled valve is used to adjust the connection and disconnection between the first pipeline and the oil tank according to a fifth control signal; The second component combination includes: an electrically controlled three-way valve, a third pipeline, an artificial oil extraction interface and a fifth electrically controlled valve, wherein the first end of the electrically controlled three-way valve is connected to the oil extraction port of the transformer, the second end of the electrically controlled three-way valve is connected to the first end of the first pipeline, the third end of the electrically controlled three-way valve is connected to the first end of the third pipeline, and the second end of the third pipeline is provided with the artificial oil extraction interface; the electrically controlled three-way valve is used to guide the oil extraction port of the transformer to connect to the first pipeline or the third pipeline according to a sixth control signal, and the fifth electrically controlled valve is used to adjust the on-off of the third pipeline according to a seventh control signal; A third component combination includes: a circulation pump and an oil flow monitoring module arranged in the second pipeline, wherein the circulation pump is used to push the oil in the second pipeline to flow from the second interface to the electric cylinder according to an eighth control signal, and the oil flow monitoring module is used to monitor the oil flow circulation parameters in the second pipeline; The fourth component combination includes: a vacuum pump and a pressure monitoring module arranged in the first pipeline, the vacuum pump is used to evacuate the first pipeline according to a ninth control signal, and the pressure monitoring module is used to measure the pressure value in the first pipeline.

3. The oil extraction interface conversion device according to claim 1 or 2, characterized in that: Also includes: The first control module is connected to each electric control valve in the oil extraction interface conversion device and is used to send control signals corresponding to each electric control valve in the oil extraction interface conversion device.

4. An oil extraction device, characterized in that: include: A third interface, a fourth interface, a fourth pipeline, and an oil extraction container; Two ends of the fourth pipeline are connected to the third interface and the fourth interface respectively; The third interface is used to connect with the first interface of the oil extraction interface conversion device according to any one of claims 1 to 3, and the fourth interface is used to connect with the second interface of the oil extraction interface conversion device; Two ends of the oil collection container are respectively connected to the third interface and the fourth interface for collecting oil samples of the transformer.

5. The oil extraction device according to claim 4, characterized in that: Also includes: a sixth electrically controlled valve, disposed between the third interface and the oil extraction container, and used for regulating the connection and disconnection between the third interface and the oil extraction container according to a tenth control signal; a fifth pipeline arranged in parallel with the fourth pipeline; The seventh electrically controlled valve is arranged in the fifth pipeline, and is used for adjusting the on-off of the fifth pipeline according to the eleventh control signal.

6. The oil extraction device according to claim 4 or 5, characterized in that: Also includes: The second control module is connected to each of the electric control valves in the oil extraction device and is used to send control signals corresponding to each of the electric control valves in the oil extraction device.

7. An oil extraction system, characterized in that: include: The oil extraction interface conversion device according to any one of claims 1 to 3, wherein the oil extraction interface conversion device is used to convert the oil extraction port of the transformer into a first interface and a second interface; An oil extraction robot comprises a robotic arm and the oil extraction device according to any one of claims 4 to 6, wherein the oil extraction device is mounted on the robotic arm, and the oil extraction robot is used to control the movement of the robotic arm to dock the third interface of the oil extraction device with the first interface, and to dock the fourth interface of the oil extraction device with the second interface.

8. A control method for an oil extraction interface conversion device, characterized in that: The oil extraction interface conversion device applied to any one of claims 1 to 3 comprises: receiving a docking signal from an oil extraction device, wherein the docking signal indicates that the oil extraction device has been docked with the oil extraction interface conversion device; Control the first electrically controlled valve, the second electrically controlled valve and the third electrically controlled valve of the oil extraction interface conversion device to open; The motor of the electric cylinder of the oil extraction interface conversion device is controlled to pull the piston to the first position.

9. The control method according to claim 8, characterized in that: After controlling the motor of the electric cylinder of the oil extraction interface conversion device to pull the piston to a preset position, the method further includes: If it is determined that the oil extraction stopping condition is met, the first electronically controlled valve is controlled to close; Controlling the motor to pull the piston to a second position; when the piston is at the second position, the inner cavity volume of the electric cylinder is greater than the inner cavity volume of the electric cylinder when the piston is at the first position; Controlling the third electrically controlled valve to close, and controlling the first electrically controlled valve to open; The motor is controlled to push the piston to a third position; when the piston is at the third position, the inner cavity volume of the electric cylinder is less than or equal to the inner cavity volume of the electric cylinder when the piston is at the first position.

10. A control method for an oil extraction system, characterized in that: Applied to the oil extraction system of claim 7, the oil extraction system comprises an oil extraction interface conversion device and an oil extraction robot, and the method comprises: The oil extraction robot controls the mechanical arm to move so as to dock the third interface of the oil extraction device with the first interface of the oil extraction interface conversion device, and dock the fourth interface of the oil extraction device with the second interface of the oil extraction interface conversion device; The oil extraction device sends a docking signal to the oil extraction interface conversion device, wherein the docking signal indicates that the oil extraction device has been docked with the oil extraction interface conversion device; The oil extraction interface conversion device receives the docking signal; The oil extraction interface conversion device controls the first electrically controlled valve, the second electrically controlled valve and the third electrically controlled valve to open; The oil extraction interface conversion device controls the motor of the electric cylinder to pull the piston to the first position.

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