Device and method for detecting leakage rate in hydraulic cylinder in real time

Abstract

The invention discloses a real-time detection device for the leakage rate in a hydraulic cylinder, and relates to the technical field of hydraulic cylinders. Comprising a hydraulic cylinder, and a first oil inlet and outlet and a second oil inlet and outlet are formed in the two ends of the hydraulic cylinder. The power oil source is connected with the first oil inlet and outlet through a first oil way, connected with the second oil inlet and outlet through a second oil way and used for conveying hydraulic oil to the hydraulic cylinder and obtaining the hydraulic oil conveyed from the hydraulic cylinder. The device further comprises a first accumulative flow meter arranged in the first oil way and a second accumulative flow meter arranged in the second oil way. And the first accumulative flowmeter and the second accumulative flowmeter are electrically connected to the PLC. According to the device, the accumulated flow value of the introduced hydraulic oil is obtained through the first accumulated flow meter. And a second accumulative flow meter theoretical flow value is obtained through calculation. And the leakage amount of the hydraulic cylinder is calculated by comparing the difference value between the actual flow value obtained in the second accumulative flow meter and the theoretical flow value.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic cylinders, and in particular to a real-time detection device and method for leakage in a hydraulic cylinder. Background Art

[0002] Internal leakage is a common indicator of hydraulic cylinders, and excessive internal leakage is also a common fault of hydraulic cylinders. Internal leakage mainly refers to the leakage of oil inside the hydraulic cylinder from the high-pressure area to the low-pressure area, causing the rod chamber and the rodless chamber of the hydraulic cylinder to communicate, reducing the output force of the hydraulic cylinder. When the internal leakage exceeds the standard, it will cause the hydraulic cylinder to not work normally. The main manifestations are: the hydraulic cylinder cannot be locked, the hydraulic cylinder sinks slightly, and the hydraulic cylinder retracts slowly. There are two situations for the detection of internal leakage in hydraulic cylinders, factory testing during production and data monitoring during use; for internal leakage during factory testing, the internal leakage of single-acting and double-acting hydraulic cylinders is specified in GB / T15622-2005, and the internal leakage test method is specified as follows: let the working chamber of the tested cylinder be filled with oil, pressurized to the rated pressure or the user-specified pressure, and measure the leakage through the piston to the unpressurized chamber. The current methods for detecting internal leakage in hydraulic cylinders are: 1. Open the low-pressure chamber oil port, and count the number of drops of hydraulic oil after the leakage amount stabilizes, with each drop being 0.05 mL; 2. Open the low-pressure chamber oil port, and use a measuring cup to measure the internal leakage within a certain period of time after the leakage amount stabilizes.

[0003] In the actual application of construction machinery, the internal leakage detection of hydraulic cylinders currently mainly relies on observing indirect indicators such as vibration, noise and temperature changes of the cylinder. However, these indicators are easily interfered by many other factors, resulting in limited reliability of the detection results. In order to improve the detection accuracy, a more intuitive method is: in the shutdown state, extend the cylinder to the limit position and disconnect the oil pipe with the rod chamber. Then, pressurize the cylinder through operation and observe whether there is oil leakage from the oil port of the rod chamber. If oil outflow is observed, it directly indicates that there is an internal leakage. However, this method has obvious defects. It cannot be detected under the normal working state of the hydraulic cylinder, and often when the leakage is confirmed, the sealing system of the hydraulic cylinder has been seriously damaged, resulting in the possibility that the entire cylinder needs to be scrapped, and may even cause a host accident.

[0004] In summary, in the prior art, it is impossible to detect the leakage in the hydraulic cylinder in real time by observing the oil cylinder or stopping the machine for pressurization. Summary of the invention

[0005] The purpose of the present application is to provide a real-time detection device and method for the leakage in a hydraulic cylinder, so as to solve the problem that the leakage in the hydraulic cylinder cannot be monitored in real time in the prior art.

[0006] In order to achieve the above objectives / solve the above technical problems, this application is implemented by adopting the following technical solutions:

[0007] In one aspect, the present invention provides a real-time detection device for leakage in a hydraulic cylinder, comprising:

[0008] A hydraulic cylinder, wherein the first cavity is provided with a first oil inlet and an outlet, and the second cavity is provided with a second oil inlet and an outlet;

[0009] A power oil source, connected to the first oil inlet and outlet through a first oil circuit, and connected to the second oil inlet and outlet through a second oil circuit, for delivering hydraulic oil to the hydraulic cylinder and obtaining hydraulic oil delivered from the hydraulic cylinder;

[0010] A first cumulative flow meter is disposed in the first oil circuit;

[0011] A second cumulative flow meter is disposed in the second oil circuit;

[0012] The PLC controller is signal-connected to the first integrating flow meter and the second integrating flow meter.

[0013] In the device, the hydraulic rod is a piston hydraulic cylinder, which can be a single piston rod hydraulic cylinder or a double piston hydraulic cylinder. The hydraulic cylinder is used as the detection object, and the first inlet and outlet oil ports and the second inlet and outlet oil ports are respectively provided at both ends of the hydraulic cylinder. The two oil ports are the channels for the hydraulic oil to enter and exit the hydraulic cylinder. The power oil source is used to provide a stable supply of hydraulic oil to the hydraulic cylinder and receive the hydraulic oil returned from the hydraulic cylinder. Thereby ensuring the circulation of hydraulic oil in the hydraulic cylinder during normal operation. The first cumulative flow meter is arranged in the first oil circuit, which is responsible for measuring the cumulative flow of hydraulic oil flowing from the power oil source to the hydraulic cylinder. The second cumulative flow meter is located in the second oil circuit, which is responsible for measuring the cumulative flow of hydraulic oil returning from the hydraulic cylinder to the power oil source. It should be noted that the flow direction of the hydraulic oil in the first oil circuit and the second oil circuit here is not unique. By changing the flow direction of the hydraulic oil, the leakage of the hydraulic cylinder in the opposite direction can be detected. In order to monitor the leakage of the hydraulic cylinder in real time, the present invention uses a PLC controller as the brain of the device, which is electrically connected to the first cumulative flow meter and the second cumulative flow meter. It can not only receive and process the flow data from the two flow meters in real time, but also calculate the internal leakage of the hydraulic cylinder according to the preset algorithm and program. In addition, the PLC controller also has powerful data processing and storage capabilities, and can record and analyze historical data, providing strong support for equipment maintenance and optimization.

[0014] Optionally, the PLC controller has a hydraulic cylinder parameter editing function, and the editable hydraulic cylinder parameters include: cylinder diameter and rod diameter. Through the hydraulic cylinder parameter editing function, accurate measurement and real-time monitoring of the internal leakage of hydraulic cylinders of different types and models can be achieved. Specifically, the PLC controller in the present invention calculates the internal leakage of the hydraulic cylinder through a specific algorithm and program. In practical applications, there are often differences in the cylinder diameter and rod diameter of hydraulic cylinders of different specifications and models. These differences will directly affect the flow characteristics and leakage calculation of the hydraulic cylinder during operation. In order to accurately measure and calculate the internal leakage of various types of hydraulic cylinders, the PLC controller provides a parameter editing function, allowing the user to make precise settings according to the actual parameters of the hydraulic cylinder. Through this design, the user can flexibly edit and input the key parameters of the hydraulic cylinder according to actual needs. Accurate measurement and real-time monitoring of the internal leakage of hydraulic cylinders of different types and models are achieved.

[0015] Optionally, the first oil circuit and the second oil circuit are connected to a power oil source via a reversing valve.

[0016] As a hydraulic control element, the reversing valve can connect or disconnect the first oil circuit and the second oil circuit with the power oil source as needed, and can switch the flow direction of the oil between the two oil circuits. As a result, the hydraulic cylinder can receive hydraulic oil from the power oil source as needed, or return the hydraulic oil to the power oil source, thereby realizing the expansion and contraction of the hydraulic cylinder and the circulation of the oil. Through this design, the oil circuit can be flexibly switched. Thus, the leakage of the hydraulic cylinder in the opposite direction can be effectively detected. By detecting the leakage of the hydraulic cylinder in different directions, it can be judged that the hydraulic cylinder has internal damage or aging of the seal. It is crucial to timely discover and solve problems in the hydraulic system.

[0017] Optionally, the first oil circuit is connected to the first oil inlet and outlet via a first interface;

[0018] The second oil circuit is connected to the second oil inlet and outlet through a second interface.

[0019] For hydraulic cylinders of different types and models, the first oil inlet and outlet and the second oil inlet and outlet may have different sizes. The present invention is adapted to different hydraulic cylinders through the first interface and the second interface.

[0020] In practical applications, when different types of hydraulic cylinders need to be tested, users only need to select or adjust the appropriate first interface and second interface according to the size of the hydraulic cylinder's oil inlet and outlet. In this way, real-time monitoring of the internal leakage of different types of hydraulic cylinders can be easily achieved without complex modification or adjustment of the detection device. In addition, the sealing materials used in the first interface and the second interface ensure that no leakage occurs at the interface during high-pressure and high-speed oil flow.

[0021] On the other hand, the present invention provides a method for real-time detection of leakage in a hydraulic cylinder, which is applied to a real-time detection device for leakage in a hydraulic cylinder, and is characterized in that it comprises the following steps:

[0022] Step 1: Connect the first oil circuit and the second oil circuit to the first oil inlet and the second oil inlet and the second oil inlet of the hydraulic cylinder to be tested respectively;

[0023] Step 2: Input the hydraulic cylinder parameters through the PLC controller;

[0024] That is: the cylinder diameter D of the hydraulic cylinder, the piston rod diameter d1 on the first oil inlet and outlet side, and the piston rod diameter d2 on the second oil inlet and outlet side. If there is no piston rod on this side, the rod diameter is 0;

[0025] Step 3: The hydraulic oil is delivered to one side of the hydraulic cylinder through the power oil source, thereby pushing the piston of the hydraulic cylinder to move;

[0026] Step 4: The PLC controller calculates the hydraulic cylinder leakage through a preset program. The calculation method is as follows:

[0027] Obtain the cumulative flow value V of the first cumulative flow meter, the cylinder diameter D of the hydraulic cylinder, and the piston rod diameter d1, and calculate the cumulative displacement value L of the piston;

[0028] According to the piston cumulative displacement value L, the hydraulic cylinder diameter D and the piston rod diameter d2, the theoretical cumulative flow value B on the second inlet and outlet side is calculated;

[0029] The actual cumulative flow value B1 in the second cumulative flow meter is obtained, and the difference between the actual cumulative flow value B1 and the theoretical cumulative flow value B is the leakage of the hydraulic cylinder.

[0030] This method can accurately calculate the leakage of the hydraulic cylinder through a high-precision flow meter and PLC controller, as well as a scientific calculation method, and can achieve real-time monitoring of the internal leakage of the hydraulic cylinder, and timely discover the internal leakage fault of the hydraulic cylinder.

[0031] In practical applications, this device can not only temporarily detect leakage in the hydraulic cylinder. The power oil source in this device can meet the working needs of the hydraulic cylinder. This device can be combined with the daily operation of the hydraulic system to achieve real-time leakage detection in the actual operation of the hydraulic cylinder.

[0032] Optionally, the PLC controller has an alarm function, and when the leakage of the hydraulic cylinder exceeds a preset range, the PLC controller may sound an alarm.

[0033] By monitoring the leakage of the hydraulic cylinder in real time and comparing it with the preset threshold, the PLC controller can immediately issue an alarm when the leakage exceeds the normal range. This helps operators to detect the failure or wear of the hydraulic cylinder in time to avoid further deterioration of the failure.

[0034] Compared with the prior art, the beneficial effects achieved by the present application are as follows: the present device can collect the flow data of the hydraulic cylinder inlet and outlet in real time through the first cumulative flow meter and the second cumulative flow meter, and can calculate the leakage amount in real time based on the collected flow data and hydraulic cylinder parameters through the algorithm built into the PLC controller, and compare it with the preset threshold value to achieve accurate monitoring and early warning.

[0035] Secondly, this device not only has the ability of temporary detection, but its power oil source can also supply oil for the daily operation of the hydraulic system. During the normal operation of the hydraulic cylinder, this device can continuously and in real time monitor the leakage without interrupting the operation of the system. This long-term and continuous monitoring capability enables operators to timely understand the wear and performance trend of the hydraulic cylinder, providing strong data support for subsequent maintenance and upgrades. In addition, the PLC controller of this device has the function of editing the hydraulic cylinder parameters. Through the editing function of the hydraulic cylinder parameters, it can realize the accurate measurement and real-time monitoring of the leakage in hydraulic cylinders of different types and models.

[0036] In addition, the structure design of the device is simple and compact, and it is easy to install, disassemble and replace. This design not only reduces the complexity of installation, but also reduces maintenance costs and time. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 It is a schematic diagram of the structure of some embodiments provided by this application;

[0039] Description of reference numerals:

[0040] 1. Hydraulic cylinder; 2. Power oil source; 3. First oil circuit; 4. Second oil circuit; 5. First cumulative flow meter; 6. Second cumulative flow meter; 7. Reversing valve; 8. PLC controller; 11. First oil inlet and outlet; 12. Second oil inlet and outlet; 31. First interface; 41. Second interface. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present disclosure / application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use.

[0042] Embodiment 1

[0043] This embodiment introduces a real-time detection device for leakage in a hydraulic cylinder. Figure 1 The real-time detection device for the leakage in the hydraulic cylinder in this embodiment comprises: a hydraulic cylinder 1, which is provided with a first oil inlet and outlet 11 and a second oil inlet and outlet 12 at both ends. A power oil source 2 is connected to the first oil inlet and outlet 11 through a first oil circuit 3, and is connected to the second oil inlet and outlet 12 through a second oil circuit 4, and is used to deliver hydraulic oil to the hydraulic cylinder 1, and to obtain the hydraulic oil delivered from the hydraulic cylinder 1. This embodiment also includes a first cumulative flow meter 5 arranged in the first oil circuit 3 and a second cumulative flow meter 6 arranged in the second oil circuit 4. The signals of the first cumulative flow meter 5 and the second cumulative flow meter 6 are connected to the PLC controller 8. In this device, the hydraulic rod is a piston hydraulic cylinder 1, which can be a single piston rod hydraulic cylinder 1 or a double piston hydraulic cylinder 1. The hydraulic cylinder 1 is used as the detection object, and the first oil inlet and outlet 11 and the second oil inlet and outlet 12 are respectively provided at both ends. These two oil ports are the channels for the hydraulic oil to enter and exit the hydraulic cylinder 1. The power oil source 2 is used to provide a stable supply of hydraulic oil to the hydraulic cylinder 1 and receive the hydraulic oil returned from the hydraulic cylinder 1. Thereby, the circulation of hydraulic oil in the hydraulic cylinder 1 during normal operation is ensured. The first cumulative flow meter 5 is arranged in the first oil circuit 3, and is responsible for measuring the cumulative flow of hydraulic oil flowing from the power oil source 2 to the hydraulic cylinder 1. The second cumulative flow meter 6 is located in the second oil circuit 4, and is responsible for measuring the cumulative flow of hydraulic oil returning from the hydraulic cylinder 1 to the power oil source 2. It should be noted that the flow direction of the hydraulic oil in the first oil circuit 3 and the second oil circuit 4 here is not unique. By changing the flow direction of the hydraulic oil, the leakage of the hydraulic cylinder 1 in the opposite direction can be detected. In order to monitor the leakage of the hydraulic cylinder 1 in real time, the present invention is electrically connected to the first cumulative flow meter 5 and the second cumulative flow meter 6 through the PLC controller 8. It can not only receive and process the flow data from the two flow meters in real time, but also calculate the internal leakage of the hydraulic cylinder 1 according to the preset algorithm and program. In addition, the PLC controller 8 also has powerful data processing and storage capabilities, and can record and analyze historical data, providing strong support for equipment maintenance and optimization.

[0044] In this embodiment, the power oil source 2 introduces the hydraulic oil into one side of the hydraulic cylinder 1 through the first oil circuit 3 and pushes the piston to move. The cumulative flow value of the introduced hydraulic oil can be obtained through the first cumulative flowmeter 5. The cumulative displacement value of the piston of the hydraulic cylinder 1 can be calculated based on the cumulative flow value combined with parameter information such as the cylinder diameter of the hydraulic cylinder 1 and the piston rod diameter. Then, the theoretical cumulative flow value on the side of the second oil inlet and outlet 12 can be calculated through the cumulative displacement value of the piston and the piston rod diameter. The difference between the actual cumulative flow value B1 obtained by the second cumulative flowmeter 6 and the theoretical cumulative flow value B is the leakage amount of the hydraulic cylinder 1.

[0045] During the use of this embodiment, first, the power oil source 2 introduces the hydraulic oil into one side of the hydraulic cylinder 1 through the first oil circuit 3, and pushes the piston to move. In this process, the first cumulative flowmeter 5 records the cumulative flow value of the introduced hydraulic oil. Next, the cumulative displacement value of the piston of the hydraulic cylinder 1 is calculated based on the cumulative flow value and parameters such as the cylinder diameter of the hydraulic cylinder 1 and the piston rod diameter. Further, the theoretical cumulative flow value on one side of the second oil inlet and outlet 12 can be obtained by calculation. It indicates the flow that should pass through the second oil inlet and outlet 12 in the absence of leakage. However, in the actual system, due to the existence of leakage. The leakage of the hydraulic cylinder 1 can be calculated by comparing the difference between the actual cumulative flow value obtained in the second cumulative flowmeter 6 and the theoretical cumulative flow value.

[0046] Embodiment 2:

[0047] Based on the same inventive concept as in Example 1, refer to Figure 1 The real-time detection device for leakage in a hydraulic cylinder in this embodiment comprises: a hydraulic cylinder 1, with a first oil inlet and outlet 11 and a second oil inlet and outlet 12 at both ends. In this embodiment, the power oil source 2 is connected to the first oil circuit 3 and the second oil circuit 4 through a reversing valve 7. Among them, the first oil circuit 3 is connected to the first oil inlet and outlet 11 through a first interface 31, and the second oil circuit 4 is connected to the second oil inlet and outlet 12 through a second interface 41. The power source is used to deliver hydraulic oil to the hydraulic cylinder 1 and obtain the hydraulic oil delivered from the hydraulic cylinder 1.

[0048] The reversing valve 7 is a hydraulic control element. The first oil circuit 3 and the second oil circuit 4 can be connected or disconnected with the power oil source 2 as needed, and the flow direction of the oil can be switched between the two oil circuits. As a result, the hydraulic cylinder 1 can receive hydraulic oil from the power oil source 2 as needed, or return the hydraulic oil to the power oil source 2, thereby realizing the expansion and contraction of the hydraulic cylinder 1 and the circulation of the oil. Through this design, flexible switching of the oil circuit is achieved. Thus, the leakage of the hydraulic cylinder 1 in the opposite direction can be effectively detected. By detecting the leakage amount of the hydraulic cylinder 1 in different directions. It can be judged that the hydraulic cylinder 1 has internal damage or aging of the seals and other problems. It is very important to timely discover and solve problems in the hydraulic system. For hydraulic cylinders 1 of different types and models, the size of the first inlet and outlet oil ports 11 and the second inlet and outlet oil ports 12 may be different. This embodiment adapts different hydraulic cylinders 1 through the first interface 31 and the second interface 41.

[0049] This embodiment further includes a first cumulative flow meter 5 disposed in the first oil circuit 3 and a second cumulative flow meter 6 disposed in the second oil circuit 4. The signals of the first cumulative flow meter 5 and the second cumulative flow meter 6 are connected to the PLC controller 8. The hydraulic rod in this device is a piston hydraulic cylinder 1, which can be a single piston rod hydraulic cylinder 1 or a double piston hydraulic cylinder 1.

[0050] In this embodiment, the PLC controller 8 has a parameter editing function for the hydraulic cylinder 1. Specifically, the editable parameters of the hydraulic cylinder 1 include: cylinder diameter and rod diameter. Through the parameter editing function of the hydraulic cylinder 1, accurate measurement and real-time monitoring of the internal leakage of hydraulic cylinders of different types and models can be achieved. In this embodiment, the PLC controller 8 calculates the internal leakage of the hydraulic cylinder 1 through a specific algorithm and program. In practical applications, there are often differences in the cylinder diameter and rod diameter of hydraulic cylinders 1 of different specifications and models. These differences will directly affect the flow characteristics and leakage calculation of the hydraulic cylinder 1 during operation. In order to accurately measure and calculate the internal leakage of various types of hydraulic cylinders 1, the PLC controller 8 provides a parameter editing function, allowing the user to make precise settings according to the actual parameters of the hydraulic cylinder 1. Through this design, the user can flexibly edit and input the key parameters of the hydraulic cylinder 1 according to actual needs. Accurate measurement and real-time monitoring of the internal leakage of hydraulic cylinders of different types and models are achieved.

[0051] The present invention is electrically connected to the first cumulative flow meter 5 and the second cumulative flow meter 6 through the PLC controller 8. It can not only receive and process the flow data from the two flow meters in real time, but also calculate the internal leakage of the hydraulic cylinder 1 according to the preset algorithm and program. In this embodiment, the PLC controller 8 also has an alarm function. When the leakage of the hydraulic cylinder 1 exceeds the preset range, the PLC controller 8 can issue an alarm.

[0052] By monitoring the leakage of the hydraulic cylinder 1 in real time and comparing it with a preset threshold, the PLC controller 8 can immediately issue an alarm when the leakage exceeds the normal range. This helps the operator to promptly detect the failure or wear of the hydraulic cylinder 1 and avoid further deterioration of the failure.

[0053] Embodiment three:

[0054] This embodiment provides a method for real-time detection of leakage in a hydraulic cylinder, which is applied to a real-time detection device for leakage in a hydraulic cylinder. The method comprises the following steps:

[0055] Step A, connecting the first oil circuit 3 and the second oil circuit 4 to the first oil inlet and outlet 11 and the second oil inlet and outlet 12 of the hydraulic cylinder 1 to be tested respectively;

[0056] Step B, inputting the parameters of the hydraulic cylinder 1 through the PLC controller 8;

[0057] That is: the cylinder diameter D of the hydraulic cylinder 1, the piston rod diameter d1 on the first oil inlet and outlet 11 side, and the piston rod diameter d2 on the second oil inlet and outlet 12 side. If there is no piston rod on this side, the rod diameter is 0;

[0058] Step C, delivering hydraulic oil to one side of the hydraulic cylinder 1 through the power oil source 2, thereby pushing the hydraulic cylinder piston to move;

[0059] Step D, the PLC controller 8 calculates the leakage of the hydraulic cylinder 1 through a preset program, and the calculation method is as follows:

[0060] Obtain the cumulative flow value V of the first cumulative flow meter 5, the cylinder diameter D of the hydraulic cylinder 1, the piston rod diameter d1, and the cumulative displacement value L=V / (π(D²-d1²) / 4), and the piston cumulative displacement value L can be obtained;

[0061] According to the piston cumulative displacement value L, the hydraulic cylinder diameter D and the piston rod diameter d2, according to the theoretical cumulative flow value B=(π(D²-d2²) / 4)*L, the theoretical cumulative flow value B on the second inlet and outlet 12 side can be obtained;

[0062] The actual accumulated flow value B1 in the second accumulated flow meter 6 is obtained, and the difference between the actual accumulated flow value B1 and the theoretical accumulated flow value B is the leakage amount of the hydraulic cylinder 1.

[0063] The method can accurately calculate the leakage of the hydraulic cylinder 1 through a high-precision flow meter and a PLC controller 8, as well as a scientific calculation method, and can realize real-time monitoring of the internal leakage of the hydraulic cylinder 1, and can timely discover the internal leakage fault of the hydraulic cylinder.

[0064] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present disclosure / application, and these improvements and modifications should also be regarded as the scope of protection of the present disclosure / application.

Claims

1. A real-time detection device for leakage in a hydraulic cylinder, characterized in that: include A hydraulic cylinder (1), wherein the first cavity is provided with a first oil inlet and outlet (11), and the second cavity is provided with a second oil inlet and outlet (12); A power oil source (2) connected to the first oil inlet and outlet (11) via a first oil circuit (3), and connected to the second oil inlet and outlet (12) via a second oil circuit (4), for delivering hydraulic oil to the hydraulic cylinder (1) and obtaining hydraulic oil delivered from the hydraulic cylinder (1); A first cumulative flow meter (5) is arranged in the first oil circuit (3); A second cumulative flow meter (6) is arranged in the second oil circuit (4); The PLC controller (8) is signal-connected to the first integrating flow meter (5) and the second integrating flow meter (6).

2. The real-time detection device for leakage in a hydraulic cylinder according to claim 1, characterized in that: The PLC controller (8) has a hydraulic cylinder parameter editing function.

3. The real-time detection device for leakage in a hydraulic cylinder according to claim 2, characterized in that: The hydraulic cylinder parameters editable by the PLC controller (8) include: the hydraulic cylinder diameter and the piston rod diameter.

4. The real-time detection device for leakage in a hydraulic cylinder according to claim 1, characterized in that: The first oil circuit (3) and the second oil circuit (4) are connected to the power oil source (2) via a reversing valve (7).

5. The real-time detection device for leakage in a hydraulic cylinder according to claim 1, characterized in that: The first oil circuit (3) is connected to the first oil inlet and outlet (11) via a first interface (31); The second oil circuit (4) is connected to the second oil inlet and outlet (12) via a second interface (41).

6. The real-time detection device for leakage in a hydraulic cylinder according to claim 1, characterized in that: The PLC controller (8) has an alarm function, and when the leakage amount of the hydraulic cylinder (1) exceeds a preset range, the PLC controller (8) can issue an alarm.

7. The real-time detection device for leakage in a hydraulic cylinder according to claim 1, characterized in that: The hydraulic cylinder is a single-piston rod hydraulic cylinder (1).

8. The real-time detection device for leakage in a hydraulic cylinder according to claim 1, characterized in that: The hydraulic cylinder is a double-piston rod hydraulic cylinder (1).

9. A method for real-time detection of leakage in a hydraulic cylinder, applied to the real-time detection device for leakage in a hydraulic cylinder according to claim 2, characterized in that: The steps include: Step A, connecting the first oil circuit (3) and the second oil circuit (4) to the first oil inlet and outlet (11) and the second oil inlet and outlet (12) of the hydraulic cylinder (1) to be tested respectively; Step B, inputting the hydraulic cylinder parameters through the PLC controller (8); The hydraulic cylinder parameters include: the cylinder diameter D of the hydraulic cylinder (1), the piston rod diameter d1 on the first oil inlet and outlet (11) side, and the piston rod diameter d2 on the second oil inlet and outlet (12) side. If there is no piston rod on this side, the rod diameter is 0; Step C, delivering hydraulic oil to one side of the hydraulic cylinder through the power oil source (2), thereby pushing the piston of the hydraulic cylinder to move; Step D, the PLC controller (8) calculates the hydraulic cylinder leakage through a preset program, and the calculation method is as follows: Obtain the cumulative flow value V of the first cumulative flow meter (5), the cylinder diameter D of the hydraulic cylinder, and the piston rod diameter d1, and calculate the cumulative displacement value L of the piston; According to the piston cumulative displacement value L, the hydraulic cylinder diameter D and the piston rod diameter d2, a theoretical cumulative flow value B on one side of the second oil inlet and outlet (12) is calculated; The actual accumulated flow value B1 in the second accumulated flow meter (6) is obtained, and the difference between the actual accumulated flow value B1 and the theoretical accumulated flow value B is the leakage of the hydraulic cylinder.

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