Oil duct anomaly detection method and device

Abstract

The invention discloses an oil duct anomaly detection method and device, and relates to the technical field of oil duct detection. Gas with a preset volume is injected from the oil duct main path, and then the oil duct main path is blocked; detecting the pressure values of the oil duct main path and each oil duct branch path, and obtaining the pressure ratio of each oil duct branch path to the oil duct main path based on all the pressure values; and according to the pressure ratio between each oil duct branch and the oil duct main path, determining the penetration and penetration conditions of each oil duct branch. The pressure values of the oil duct main path and the oil duct branches are detected respectively, the pressure ratio of the oil duct branches to the oil duct main path is obtained through the pressure values, and then the communication and penetration conditions of the oil duct branches are further determined according to the pressure ratio of the oil duct branches to the oil duct main path, so that whether the oil duct branches are communicated or not is effectively distinguished; and moreover, the oil duct branch with the penetrating defect is accurately positioned, and the anomaly detection efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of oil channel detection, and in particular to a method and device for detecting oil channel abnormality. Background Art

[0002] Oil channels are widely used in electric drive housings and play an important role as cooling devices for electric drives. Since electric drive housings need to be lightweight and have a certain strength, high-pressure die-casting is widely used in the industry. However, during the die-casting process, due to the limitations of the high-pressure casting process itself, it is impossible to avoid the formation of pores inside the product, which may cause oil channel penetration in severe cases. Therefore, abnormal detection and positioning of oil channels is extremely important.

[0003] In the related art, pressure detection utilizes the fluidity of gas in the oil channel to detect whether there is a through-hole defect in the oil channel through the change of the overall pressure of the oil channel.

[0004] However, conventional pressure testing can usually only detect whether there is a through defect inside the oil channel. Water testing is required to further locate which branch the through defect is in. It is also difficult to distinguish between a branch that has not been penetrated and a branch that has a through defect, which seriously slows down the efficiency of abnormality detection. Summary of the invention

[0005] The present application provides an oil channel abnormality detection method and device, which can distinguish between a non-through branch and a branch with a through defect in the oil channel, and accurately locate the oil channel branch with a through defect.

[0006] In a first aspect, an embodiment of the present application provides a method for detecting oil channel abnormality, the method comprising:

[0007] Block each branch of the oil channel;

[0008] A preset volume of gas is injected from the main oil passage, and then the main oil passage is blocked;

[0009] Detecting the pressure values ​​of the main oil channel and each branch oil channel, and obtaining the pressure ratio of each branch oil channel to the main oil channel based on all the pressure values;

[0010] The penetration and through-going conditions of each oil channel branch are determined according to the pressure ratio between each oil channel branch and the oil channel main channel.

[0011] The method detects the pressure values ​​of the main oil channel and each oil channel branch respectively, and obtains the pressure ratio of each oil channel branch to the main oil channel through the pressure values, and then further determines the penetration and through-state of each oil channel branch according to the pressure ratio between each oil channel branch and the main oil channel, effectively distinguishes whether the oil channel branch is through-connected, and accurately locates the oil channel branch with a penetration defect, thereby improving the efficiency of abnormality detection.

[0012] In combination with the first aspect, in one implementation, blocking each oil channel branch includes:

[0013] Seal off the oil channel branches that need to be connected in the design.

[0014] In combination with the first aspect, in one embodiment, injecting a preset volume of gas from the main oil channel includes:

[0015] Inject a preset volume of gas from the main oil channel through an airtightness tester or an air pump.

[0016] In combination with the first aspect, in one implementation, the detecting the pressure values ​​of the main oil channel and each branch oil channel includes:

[0017] Pressure sensors are provided at the blocking positions of the main oil channel and each branch oil channel;

[0018] The pressure signal of the pressure sensor is converted into the pressure values ​​of the main oil channel and each oil channel branch.

[0019] In combination with the first aspect, in one implementation, converting the pressure signal of the pressure sensor into pressure values ​​of the main oil channel and each branch oil channel includes:

[0020] If a plurality of pressure sensors are respectively arranged at the blocking positions of the main oil channel and each branch oil channel, a pressure signal of the pressure sensor is obtained and converted into a first pressure value;

[0021] The average of all first pressure values ​​corresponding to the main oil channel and each branch oil channel is used as the pressure value of the main oil channel and each branch oil channel.

[0022] In combination with the first aspect, in one implementation, obtaining the pressure ratio of each oil channel branch and the oil channel main channel based on all pressure values ​​includes:

[0023] The pressure values ​​of each branch oil channel are divided by the pressure value of the main oil channel to obtain the pressure ratio of each branch oil channel to the main oil channel.

[0024] In combination with the first aspect, in one implementation, determining the connection and penetration status of each oil channel branch according to the pressure ratio between each oil channel branch and the oil channel main channel includes:

[0025] According to the pressure ratio between each branch oil channel and the main oil channel, it is determined whether each branch oil channel is connected, and then it is determined whether each connected branch oil channel has a penetration.

[0026] In combination with the first aspect, in one implementation, judging whether each branch oil channel is connected according to the pressure ratio between each branch oil channel and the main oil channel includes:

[0027] Determining whether the current pressure ratio between the branch oil channel and the main oil channel is less than a first pressure ratio threshold;

[0028] If yes, the oil channel branch is not connected; if no, the oil channel branch is connected.

[0029] In combination with the first aspect, in one implementation, it is determined whether each of the connected oil channel branches has a penetration according to the pressure ratio between each of the oil channel branches and the oil channel main road:

[0030] Determine whether the current pressure ratio between the branch oil channel and the main oil channel is greater than a second pressure ratio threshold; and the first pressure ratio threshold is less than the second pressure ratio threshold;

[0031] If so, the oil channel branch is normal; if not, and the pressure ratio between the oil channel branch and the oil channel main line is greater than or equal to the first pressure ratio threshold, then the oil channel branch has a penetration.

[0032] In a second aspect, an embodiment of the present application provides an oil passage abnormality detection device, the device comprising:

[0033] A plugging module is used to plug each oil channel branch and the main oil channel;

[0034] A charging module, used to inject a preset volume of gas from the main oil channel;

[0035] A detection module, used to detect the pressure values ​​of the main oil channel and each branch oil channel, and obtain the pressure ratio of each branch oil channel to the main oil channel based on all the pressure values;

[0036] The judgment module is used to determine the connection and penetration status of each oil channel branch according to the pressure ratio between each oil channel branch and the oil channel main channel.

[0037] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0038] The present application detects the pressure values ​​of the main oil channel and each oil channel branch respectively, and obtains the pressure ratio of each oil channel branch and the main oil channel through the pressure values, and then further determines the penetration and through-state of each oil channel branch according to the pressure ratio between each oil channel branch and the main oil channel, effectively distinguishes whether the oil channel branch is through-connected, and accurately locates the oil channel branch with a penetration defect, thereby improving the efficiency of abnormality detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a flow chart of the oil channel abnormality detection method according to an embodiment of the present application;

[0040] Figure 2 Schematic diagram of the structure of the oil channel abnormality detection device according to an embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] First, some technical terms in the present application are explained to facilitate those skilled in the art to understand the present application.

[0043] Oil channels: Oil channels are widely used in various mechanical equipment, especially in equipment that requires high precision, high load and long life. Its main function is to provide a circulation path for lubricating oil, ensuring that the lubricating oil can smoothly reach the surface of the parts that need lubrication to reduce the heat generated by friction.

[0044] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0045] First, please refer to Figure 1 , Figure 1 The oil channel abnormality detection method provided in the embodiment of the present application comprises the following steps:

[0046] Step S1: Block each oil channel branch.

[0047] Step S2: injecting a preset volume of gas from the main oil channel, and then blocking the main oil channel.

[0048] Step S3: Detect the pressure values ​​of the main oil channel and each branch oil channel, and obtain the pressure ratio of each branch oil channel to the main oil channel based on all the pressure values.

[0049] Step S4: Determine the penetration and through-state of each branch oil channel according to the pressure ratio between each branch oil channel and the main oil channel.

[0050] In the prior art, the methods for testing thick-walled pipes include ultrasonic testing, X-ray testing, conventional eddy current testing, pulsed eddy current testing, magnetic flux leakage testing and pressure testing. Ultrasonic testing uses electromagnetic ultrasonic transducers to excite various types of ultrasound for testing; X-ray testing uses radioactive rays to irradiate the pipe for testing; conventional eddy current testing uses the principle of electromagnetic induction to non-destructively evaluate the performance of conductive materials and their workpieces by detecting changes in induced eddy currents in the workpiece being tested; pulsed eddy current testing has a rich spectrum that can extract the difference characteristics of defects inside and outside the pipe; in magnetic flux leakage testing, there are more methods for detecting internal and external defects.

[0051] However, ultrasonic testing requires coupling agents during the testing process; X-ray testing requires high testing costs and is harmful to the human body, so it is generally not used for steel pipe testing; conventional eddy current and magnetic flux leakage testing are limited by sensors and cannot scan and locate complex internal surfaces. Therefore, pressure testing is usually used to test oil channels.

[0052] The method detects the pressure values ​​of the main oil channel and each oil channel branch respectively, and obtains the pressure ratio of each oil channel branch to the main oil channel through the pressure values. Then, according to the pressure ratio between each oil channel branch and the main oil channel, the penetration and through-state of each oil channel branch is further determined, which effectively distinguishes whether the oil channel branch is through-connected, and accurately locates the oil channel branch with through-defects, thereby improving the efficiency of abnormality detection.

[0053] In some embodiments, in the above step S1, blocking each oil channel branch includes the following steps:

[0054] Seal off the oil channel branches that need to be connected in the design.

[0055] It should be noted that, when designing the oil channel, some oil channel branches are set to be connected, while some oil channel branches are set not to be connected. These designs are based on the functional requirements of the oil channel. Therefore, before the pressure test, it is necessary to determine which oil channel branches need to be tested for continuity according to the design drawings or maintenance manual of the oil channel, and block the oil channel branches that need to be tested for continuity.

[0056] Since air is circulating in the oil pipeline under normal circumstances, it is necessary to use sealing tools such as plugs and each oil branch, and then inject a preset volume of air from the main oil channel to perform pressure testing on each oil branch.

[0057] In some embodiments, in the above step S2, injecting a preset volume of gas from the main oil channel includes the following steps:

[0058] Inject a preset volume of gas from the main oil channel through an airtightness tester or an air pump.

[0059] It should be noted that the volume of injected gas is not a fixed value, but is set according to the specific parameters of the oil channel. The diameter, length, and curvature of the oil channel will affect the gas volume. The diameter and length of the oil channel directly affect the total volume of the gas. The curved part of the oil channel may cause the gas flow direction to change. If the gas is injected too fast, eddy currents or backflows may occur, affecting the local gas density. Therefore, when injecting gas, it is necessary to adjust the volume and speed of the injected gas based on the above factors to ensure that the injected gas can evenly cover the entire oil channel.

[0060] In addition, when setting the volume of the injected gas, the material strength of the oil channel wall must also be considered to avoid leakage of the oil channel wall due to excessive injection of gas. The injected gas here can be air or other inert gas that will not damage the oil channel.

[0061] In some embodiments, in the above step S3, detecting the pressure values ​​of the main oil channel and each branch oil channel includes the following steps:

[0062] First, a pressure sensor is arranged at the blocking position of the main oil channel and each branch oil channel, and then the pressure signal of the pressure sensor is converted into the pressure value of the main oil channel and each branch oil channel.

[0063] It should be noted that the pressure signal collected by the pressure sensor is usually multiple continuous values. The maximum pressure value, minimum pressure value, average pressure value and pressure change curve of the main oil channel and each oil channel branch are usually recorded. Then, the average pressure value corresponding to the main oil channel and each oil channel branch is used as the pressure value of the main oil channel and each oil channel branch.

[0064] In some embodiments, in the above step S3, converting the pressure signal of the pressure sensor into the pressure values ​​of the main oil channel and each branch oil channel includes the following steps:

[0065] If a plurality of pressure sensors are respectively arranged at the blocking positions of the main oil channel and each branch oil channel, pressure signals of the pressure sensors are acquired and converted into the first pressure value.

[0066] Afterwards, the average of all first pressure values ​​corresponding to the main oil channel and each branch oil channel is used as the pressure value of the main oil channel and each branch oil channel.

[0067] It should be noted that during the oil channel detection process, it may be affected by various factors (such as sensor factors, actual working conditions of the oil channel, etc.), and the measurement results of a single pressure sensor may have certain errors. Therefore, by setting up multiple pressure sensors and calculating the average of the measured pressure values, the error can be reduced to a certain extent, thereby obtaining the pressure value closest to the true value.

[0068] Preferably, the pressure signal collected by the pressure sensor may be filtered and then converted into pressure values ​​of the main oil channel and each branch oil channel.

[0069] When the sensor collects pressure signals, it is often affected by various factors, such as environmental noise, electromagnetic interference, and the instability of the device itself. These factors will cause the collected data to contain certain noise and interference signals. If these noise and interference signals are not processed, the accuracy and reliability of the pressure signal will be affected, and then the subsequent steps will be affected. Therefore, by filtering the pressure signal collected by the pressure sensor, the noise and interference signals in the pressure signal can be effectively removed, and the quality of the pressure signal can be improved.

[0070] In some embodiments, in the above step S3, the pressure ratio of each oil channel branch and the oil channel main channel is obtained based on all pressure values, including the following steps:

[0071] The pressure values ​​of each branch oil channel are divided by the pressure value of the main oil channel to obtain the pressure ratio of each branch oil channel to the main oil channel.

[0072] In a more specific embodiment, the oil channel has three branches, namely oil channel branch 1, oil channel branch 2 and oil channel branch 3. The pressure ratio calculation formula of each oil channel branch and the main oil channel is as follows:

[0073]

[0074] In formula (1), P1 is the pressure value of oil channel branch 1, P 主 is the pressure value of the main oil channel, K1 is the pressure ratio of the oil channel branch 1 to the main oil channel; in formula (2), P2 is the pressure value of the oil channel branch 2, P 主 is the pressure value of the main oil channel, K2 is the pressure ratio of the oil channel branch 2 to the main oil channel; in formula (3), P3 is the pressure value of the oil channel branch 3, P 主 is the pressure value of the main oil channel, and K3 is the pressure ratio of oil channel branch line 3 to the main oil channel.

[0075] In some embodiments, in the above step S4, determining the connection and penetration status of each oil channel branch according to the pressure ratio between each oil channel branch and the oil channel main channel includes the following steps:

[0076] According to the pressure ratio between each branch oil channel and the main oil channel, it is determined whether each branch oil channel is connected, and then it is determined whether each connected branch oil channel has a penetration.

[0077] It should be noted that the oil channel branch is connected, which means that the fluid can flow smoothly in the oil channel branch without obvious obstruction. The oil channel branch is penetrated, which means that there are holes on the wall of the oil channel branch that allow the fluid to leak out.

[0078] In some embodiments, in the above steps, judging whether each oil channel branch is connected according to the pressure ratio between each oil channel branch and the oil channel main channel includes:

[0079] It is determined whether the current pressure ratio between the branch oil channel and the main oil channel is less than a first pressure ratio threshold.

[0080] If yes, the oil channel branch is not connected; if no, the oil channel branch is connected.

[0081] It should be noted that if the current pressure ratio between the branch oil channel and the main oil channel is less than the first pressure ratio threshold, it means that the pressure in the branch oil channel is very low relative to the main oil channel, which may be due to the blockage of the branch oil channel, resulting in obstruction of air flow. Therefore, it can be determined that the branch oil channel is not connected.

[0082] If the current pressure ratio between the oil channel branch and the oil channel main channel is greater than the first pressure ratio threshold, the pressure in the oil channel branch is sufficiently high relative to the oil channel main channel, and the air flows smoothly in the oil channel branch without obvious obstruction. Therefore, it can be judged that the oil channel branch is connected.

[0083] In some embodiments, in the above steps, it is determined whether each of the connected oil channel branches has a penetration according to the pressure ratio between each oil channel branch and the oil channel main line:

[0084] It is determined whether the current pressure ratio between the branch oil channel and the main oil channel is greater than a second pressure ratio threshold, and the first pressure ratio threshold is less than the second pressure ratio threshold.

[0085] If so, the oil channel branch is normal; if not, and the pressure ratio between the oil channel branch and the oil channel main line is greater than or equal to the first pressure ratio threshold, then the oil channel branch has a penetration.

[0086] It should be noted that under normal conditions, the pressure of each oil channel branch should be consistent with the pressure of the oil channel main channel. When there is a through-defect in the oil channel branch, due to the large outflow of air from the through-hole, the pressure of the oil channel branch will be lower than the pressure of the oil channel main channel, and the pressure ratio between the oil channel branch and the oil channel main channel will also decrease accordingly.

[0087] The first pressure ratio threshold and the second pressure ratio threshold can be determined by test data, and can be adjusted accordingly according to the structure and material of the oil passage during actual testing. In this embodiment, the first pressure ratio threshold is preferably set to 0.1, and the second pressure ratio threshold is preferably set to 0.95.

[0088] Second, please refer to Figure 2 , Figure 2The oil passage abnormality detection device provided in the embodiment of the present application comprises a blocking module, an inflation module, a detection module and a judgment module.

[0089] The blocking module is used to block each oil channel branch and the main oil channel.

[0090] The above-mentioned inflation module is used to inject a preset volume of gas from the main oil channel.

[0091] The detection module is used to detect the pressure values ​​of the main oil channel and each branch oil channel, and then obtain the pressure ratio of each branch oil channel to the main oil channel based on all the pressure values.

[0092] The above-mentioned judgment module is used to determine the connection and penetration status of each oil channel branch according to the pressure ratio between each oil channel branch and the oil channel main line.

[0093] The device blocks each oil channel branch and the main oil channel through a blocking module, and then injects a preset volume of gas from the main oil channel through an inflation module, and respectively detects the pressure values ​​of the main oil channel and each oil channel branch through a detection module, and obtains the pressure ratio of each oil channel branch and the main oil channel based on all pressure values, and further determines the penetration and through-state of each oil channel branch according to the pressure ratio between each oil channel branch and the main oil channel through a judgment module, thereby effectively distinguishing whether the oil channel branch is through-connected, and accurately locating the oil channel branch with a through-defect, thereby improving the efficiency of abnormality detection.

[0094] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0095] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit "first", "second" and "third" to different types.

[0096] In the description of the embodiments of the present application, "exemplary", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[0097] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0098] In some processes described in the embodiments of the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0099] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0100] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for detecting oil channel abnormality, characterized in that: The method comprises: Block each branch of the oil channel; A preset volume of gas is injected from the main oil passage, and then the main oil passage is blocked; Detecting the pressure values ​​of the main oil channel and each branch oil channel, and obtaining the pressure ratio of each branch oil channel to the main oil channel based on all the pressure values; The penetration and through-going conditions of each oil channel branch are determined according to the pressure ratio between each oil channel branch and the oil channel main channel.

2. The oil channel abnormality detection method according to claim 1, characterized in that: The blocking of each oil channel branch comprises: Seal off the oil channel branches that need to be connected in the design.

3. The oil channel abnormality detection method according to claim 1, characterized in that: The step of injecting a preset volume of gas from the main oil channel comprises: Inject a preset volume of gas from the main oil channel through an airtightness tester or an air pump.

4. The oil passage abnormality detection method according to claim 1, characterized in that: The detection of the pressure values ​​of the main oil channel and each branch oil channel includes: Pressure sensors are provided at the blocking positions of the main oil channel and each branch oil channel; The pressure signal of the pressure sensor is converted into the pressure values ​​of the main oil channel and each oil channel branch.

5. The oil channel abnormality detection method according to claim 4, characterized in that: The step of converting the pressure signal of the pressure sensor into the pressure values ​​of the main oil channel and each branch oil channel comprises: If a plurality of pressure sensors are respectively arranged at the blocking positions of the main oil channel and each branch oil channel, a pressure signal of the pressure sensor is obtained and converted into a first pressure value; The average of all first pressure values ​​corresponding to the main oil channel and each branch oil channel is used as the pressure value of the main oil channel and each branch oil channel.

6. The oil passage abnormality detection method according to claim 1, characterized in that: The pressure ratio of each branch oil channel and the main oil channel obtained based on all pressure values ​​includes: The pressure values ​​of each branch oil channel are divided by the pressure value of the main oil channel to obtain the pressure ratio of each branch oil channel to the main oil channel.

7. The oil passage abnormality detection method according to claim 1, characterized in that: Determining the connection and penetration status of each oil channel branch according to the pressure ratio between each oil channel branch and the oil channel main road includes: According to the pressure ratio between each branch oil channel and the main oil channel, it is determined whether each branch oil channel is connected, and then it is determined whether each connected branch oil channel has a penetration.

8. The oil passage abnormality detection method according to claim 7, characterized in that: Judging whether each branch oil channel is connected according to the pressure ratio between each branch oil channel and the main oil channel includes: Determining whether the current pressure ratio between the branch oil channel and the main oil channel is less than a first pressure ratio threshold; If yes, the oil channel branch is not connected; if no, the oil channel branch is connected.

9. The oil passage abnormality detection method according to claim 8, characterized in that: According to the pressure ratio between each branch oil channel and the main oil channel, it is judged whether each branch oil channel has penetration: Determine whether the current pressure ratio between the branch oil channel and the main oil channel is greater than a second pressure ratio threshold; and the first pressure ratio threshold is less than the second pressure ratio threshold; If so, the oil channel branch is normal; if not, and the pressure ratio between the oil channel branch and the oil channel main line is greater than or equal to the first pressure ratio threshold, then the oil channel branch has a penetration.

10. An oil passage abnormality detection device based on the method according to any one of claims 1 to 9, characterized in that: The device comprises: A plugging module is used to plug each oil channel branch and the main oil channel; A charging module, used to inject a preset volume of gas from the main oil channel; A detection module, used to detect the pressure values ​​of the main oil channel and each branch oil channel, and obtain the pressure ratio of each branch oil channel to the main oil channel based on all the pressure values; The judgment module is used to determine the connection and penetration status of each oil channel branch according to the pressure ratio between each oil channel branch and the oil channel main channel.

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