Hydraulic oil pollution detection device

Abstract

The invention relates to the technical field of hydraulic oil detection, and particularly discloses a hydraulic oil pollution detection device which comprises a pipeline oil pipe directly connected with a hydraulic oil conveying pipeline, the outer side of the pipeline oil pipe is connected with an oil inlet tank used for intercepting oil, and the bottom of the oil inlet tank communicates with a recycling tank. Detection mechanisms arranged in parallel are arranged between the oil inlet tank and the recovery tank; the oil inlet tank is communicated with the pipeline oil pipe through an oil inlet pipe arranged on the end face of the oil inlet tank, the side of the oil inlet tank is communicated with the recycling box through a communicating pipe, a pressure and speed relieving mechanism is arranged in the oil inlet tank, and the head end and the tail end of a detection mechanism are communicated with the oil inlet tank and the recycling box respectively. The hydraulic oil pollution detection device can be directly installed on a hydraulic oil conveying pipeline, oil property detection can be carried out after oil extraction is carried out quantitatively, meanwhile, sample reserving can be carried out, cleaning is convenient, and rapid circulation can be carried out for detection and use.

Description

Technical Field

[0001] This invention relates to the field of hydraulic oil testing technology, and more specifically to a hydraulic oil contamination detection device. Background Technology

[0002] Hydraulic oil is a hydraulic medium that plays a role in energy transmission, anti-wear, system lubrication, corrosion prevention, rust prevention, and cooling. It should meet the viscosity requirements of the hydraulic device at both operating and starting temperatures. Since the viscosity change of lubricating oil is directly related to hydraulic action, transmission efficiency, and transmission accuracy, hydraulic oil should be tested for its performance before use. For example, patent CN 215066663 U discloses an online detection device for hydraulic oil contamination, belonging to the field of hydraulic transmission technology. It includes a housing installed inside an oil tank; an oil port connecting the housing to the oil tank is located at the bottom of the housing; a pressure sensor and a sliding resistance level sensor are installed at the bottom of the housing; the measuring starting point of the sliding resistance level sensor is flush with that of the pressure sensor; a thermistor temperature sensor is also installed inside the housing; the pressure sensor, sliding resistance level sensor, and thermistor temperature sensor are connected to a central processing unit (CPU) via an A / D conversion module, and the CPU is connected to a display. This invention transmits data from the pressure sensor and the sliding resistance level sensor to the CPU for processing, real-time detection of the hydraulic oil density, thereby determining the hydraulic oil contamination level; this allows users to promptly know the oil contamination level, enabling timely replacement of the hydraulic oil and reducing system failures caused by hydraulic oil contamination. For example, patent CN 215066663 U discloses an explosion-proof online oil detection system, including a housing, a detection group, an analysis group, and an explosion-proof surface. The detection group is partially housed within the housing and partially extends out of it; similarly, the analysis group is partially housed within the housing and partially extends out of it. The explosion-proof surface is fixedly installed within the housing and separates the detection group and analysis group located within the housing. This explosion-proof online oil detection system, by using an explosion-proof surface to separate the detection group and analysis group, facilitates the orderly arrangement of wiring, enhances explosion protection, reduces safety hazards, and increases the safety factor for workers operating in coal mines and oil wells. However, current hydraulic oil testing methods still have certain drawbacks. For example, during testing, extraction devices (such as syringes) are generally used to extract hydraulic oil for testing. However, this method increases the risk of hydraulic oil exposure and affects the accuracy of hydraulic oil testing. Therefore, we propose a hydraulic oil contamination detection device to solve the problems mentioned above. Summary of the Invention

[0003] The purpose of this invention is to provide a hydraulic oil contamination detection device to solve the problem mentioned in the background art that current hydraulic oil contamination detection devices require oil extraction and external testing, which exposes the oil to the outside environment and affects the accuracy of hydraulic oil detection.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic oil contamination detection device, comprising a pipeline directly connected to a hydraulic oil pipeline, an oil inlet tank for oil interception connected to the outside of the pipeline, a recovery tank connected to the bottom of the oil inlet tank, and a detection mechanism arranged in parallel between the oil inlet tank and the recovery tank. The oil inlet tank is connected to the pipeline oil pipe through an oil inlet pipe provided on its end face. The side of the oil inlet tank is connected to the recovery tank through a connecting pipe. The oil inlet tank is equipped with a pressure-reducing and speed-reducing mechanism. The detection mechanism is connected to the oil inlet tank and the recovery tank at both ends, respectively. The recovery tank is equipped with a sample container for sample retention on its side, and an oil pump for hydraulic oil return is connected to the inside of the recovery tank. The oil inlet tank is connected to an air pipe and a cleaning water pipe at the front and rear sides of the end near the top of the oil pipe. The bottom end of the air pipe is connected to the recovery tank to form an airflow circulation. The end of the cleaning water pipe is connected to a water tank. A cleaning agent tank that can supply cleaning fluid to the cleaning water pipe is provided on the outside of the water tank.

[0005] Furthermore: a fixing frame is provided above the oil pipeline, the top of the fixing frame is fixedly connected to the oil inlet tank, a water tank is fixed to the bottom outer side of the fixing frame, a connecting plate is integrally fixed to the bottom of the fixing frame, the recovery box is fixedly installed on the outside of the connecting plate, and the fixing frame and the recovery box are fixedly connected to the oil pipeline.

[0006] Furthermore: the pressure-reducing and speed-reducing mechanism is composed of a fixed plate and a stacked plate. The fixed plate is integrally fixedly installed inside the oil inlet tank. The bottom width of the fixed plate is the same as the internal width of the oil inlet tank. The outer side of the fixed plate is integrally provided with a stacked plate. The width of the stacked plate is smaller than the internal width of the oil inlet tank.

[0007] Furthermore, a temperature sensor is fixedly installed on the side of the oil inlet tank, and a temperature compensator is installed on one side of the oil inlet tank.

[0008] Furthermore: an air pump is connected to one side of the top surface of the recycling bin, and the output end of the air pump is connected to an air pipe through a three-way valve, while the other end of the three-way valve is directly connected to air.

[0009] Furthermore: the testing institution includes: The connector is provided on both the bottom surface of the oil inlet tank and the top surface of the recovery tank; A thin tube, the two ends of which are connected to the oil inlet tank and the recovery tank respectively via connectors, and a detection element connected to the internal oil circuit is fixed on the outside of the thin tube.

[0010] Furthermore: the outer side of the connector is threaded with a sleeve, the inner side of the connector is threaded with a plug, the connection between the connector and the thin tube is a threaded connection, and the plug is also threadedly connected to the thin tube.

[0011] Furthermore, the side of the recycling bin is integrally connected with a sample retention port, and the bottom of the sample retention port is threadedly connected to a sample container.

[0012] Furthermore: the bottom end of the cleaning water pipe extends through the detergent tank to the bottom surface of the water tank, and a branch pipe is integrally provided in the middle of the cleaning water pipe, located inside the detergent tank, with the bottom end of the branch pipe having a conical structure inside the detergent tank.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects: the hydraulic oil contamination detection device can be directly installed on the hydraulic oil delivery pipeline, can quantitatively extract oil and then detect the properties of the oil, can retain samples, is easy to clean, and can be used for rapid and cyclic detection. 1. This solution includes a fixed frame, an oil inlet tank, a connecting plate, and a recovery box, which are fixedly installed on the outside of the pipeline oil pipe. After connecting the pipeline oil pipe with the oil delivery pipeline, the fixedly installed oil inlet tank and oil inlet pipe facilitate the extraction of oil for testing purposes. 2. This solution includes a fixed plate and a stacked plate. The fixed plate can buffer the high-pressure, high-speed hydraulic oil entering the oil tank, and the stacked plate can reduce eddies and impacts, thereby reducing the impact on the detection element. 3. This solution is equipped with an air pump and an air pipe. The air pump can draw out the air inside the recovery tank, and the air pipe can deliver the air to the top of the oil pipeline. The airflow impact facilitates the entry of hydraulic oil from the inlet pipe into the oil tank. The air pump uses a three-way valve to discharge the air inside the recovery tank, which can create a negative pressure inside the recovery tank, facilitating the downward flow of the oil inside the oil tank for detection. 4. This solution includes a connector, a thin tube, and a detection element. The thin tube is connected to the connector via a thread, allowing oil to enter the interior of the thin tube. The detection end of the detection element is connected inside the thin tube, facilitating detection. Furthermore, the parallel arrangement of multiple thin tubes ensures that various detection results do not interfere with each other, guaranteeing detection accuracy. 5. This solution includes an oil pump and a sewage pipe. The oil pump is connected to the oil pipeline via a three-way valve, which facilitates the transfer of the oil inside the oil pipeline to the inside of the oil pipeline for return. The oil pump can also discharge the internal oil or cleaning fluid through the sewage pipe. 6. This solution includes a sample container and a sample retention port. The sample container is threaded to the bottom of the sample retention port, allowing for sample retention for testing and facilitating sample traceability. 7. This solution includes a water tank, a detergent tank, and a cleaning water pipe. The connection between the cleaning water pipe and the water tank facilitates the creation of negative pressure inside the recovery tank, allowing the water inside the recovery tank to be transported to the oil inlet pipe for cleaning. A branch pipe is installed in the middle of the cleaning water pipe, and the connection between the branch pipe and the detergent tank facilitates the simultaneous transport of water through the cleaning water pipe and the input of cleaning solution into the oil inlet pipe. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the overall left front axonometric structure of the present invention; Figure 2 This is a schematic diagram of the overall right-side rear axial structure of the present invention; Figure 3 This is a schematic diagram of the bottom right axial structure of the present invention; Figure 4 This is a schematic diagram of the interconnected structure of the oil system of the present invention; Figure 5 This is a schematic diagram of the overall disassembled structure of the present invention; Figure 6 This is a schematic diagram of the overall side cross-sectional structure of the present invention; Figure 7 This is a schematic diagram of the overall structure of the fixing plate and the laminated plate of the present invention; Figure 8 This is a schematic diagram of the overall frontal cross-section of the present invention; Figure 9 For the present invention Figure 8 Enlarged structural diagram at point A in the middle; Figure 10 This is a schematic diagram of the arrangement structure of the cleaning water pipe of the present invention.

[0015] In the diagram: 1. Oil pipeline; 2. Oil inlet tank; 3. Oil inlet pipe; 4. Fixing bracket; 5. Recovery box; 6. Connecting plate; 7. Connecting pipe; 8. Fixing plate; 9. Stacked plate; 10. Temperature sensor; 11. Temperature compensator; 12. Air pump; 13. Air pipe; 14. Connector; 15. Sleeve; 16. Plug; 17. Thin tube; 18. Detection element; 19. Battery; 20. Photovoltaic module; 21. Oil pump; 22. Sewage pipe; 23. Sample container; 24. Sample retention port; 25. Water tank; 26. Detergent tank; 27. Cleaning water pipe; 28. Branch pipe; 29. ​​Liquid injection port. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0017] Please see Figures 1-10 The present invention provides the following technical solution: A hydraulic oil contamination detection device includes: a pipeline oil pipe 1, an oil inlet tank 2, an oil inlet pipe 3, a fixing frame 4, a recovery box 5, a connecting plate 6, a connecting pipe 7, a fixing plate 8, a stacked plate 9, a temperature sensor 10, a temperature compensator 11, an air pump 12, an air pipe 13, a connector 14, a sleeve 15, a plug 16, a thin tube 17, a detection element 18, a storage battery 19, a photovoltaic module 20, an oil pump 21, a sewage pipe 22, a sample container 23, a sample retention port 24, a water tank 25, a cleaning agent tank 26, a cleaning water pipe 27, a branch pipe 28, and an injection port 29; Among them: such as Figure 1 , Figure 5 and Figure 7 In the middle, the outside of the oil pipe 1 is connected to the oil inlet tank 2 for oil interception, the bottom of the oil inlet tank 2 is connected to the recovery tank 5, the oil inlet tank 2 is connected to the oil pipe 1 through the oil inlet pipe 3 set on its end face, the side of the oil inlet tank 2 is connected to the recovery tank 5 through the connecting pipe 7, and a detection mechanism is arranged in parallel between the oil inlet tank 2 and the recovery tank 5. In specific application scenarios, valves are installed at the connection ends between the oil pipeline 1 and the oil inlet pipe 3, and between the oil inlet tank 2 and the connecting pipe 7. When in use, the oil pipeline 1 is installed into the oil pipeline. When in use, the valve between the oil pipeline 1 and the oil inlet pipe 3 is opened, allowing the oil inside the oil pipeline 1 to enter the oil inlet pipe 3. The oil then enters the oil inlet tank 2 through the oil inlet pipe 3. The oil is sent to the detection mechanism set between the oil inlet tank 2 and the recovery tank 5 for oil property detection. Excess oil can enter the recovery tank 5 through the connecting pipe 7.

[0018] The above technical solution is adopted: after the oil pipeline 1 is directly connected to the oil pipeline, the oil can be extracted at irregular intervals and in quantitative quantities through the oil inlet pipe 3. Furthermore, by utilizing the detection mechanism arranged in parallel between the oil inlet tank 2 and the recovery tank 5, multiple oil properties can be detected simultaneously, avoiding mutual interference and ensuring detection accuracy.

[0019] Among them, such as Figure 5 , Figure 6 , Figure 7 and Figure 8 In the middle, the inside of the oil inlet tank 2 is equipped with a pressure-reducing and speed-reducing mechanism. The pressure-reducing and speed-reducing mechanism is composed of a fixed plate 8 and a stacked plate 9. The fixed plate 8 is integrally fixedly installed inside the oil inlet tank 2. The bottom width of the fixed plate 8 is the same as the internal width of the oil inlet tank 2. The outer side of the fixed plate 8 is integrally equipped with a stacked plate 9. The width of the stacked plate 9 is smaller than the internal width of the oil inlet tank 2. In specific application scenarios, the oil enters directly from the oil supply pipeline, carrying high pressure and high speed impact. After entering the oil inlet tank 2, it directly contacts the fixed plate 8, which can buffer the oil. Furthermore, the stacked plates 9 inside the oil inlet tank 2 can prevent the oil from generating eddies, making it easier for the oil to enter the testing mechanism for testing.

[0020] Among them, such as Figure 1 and Figure 2 In the middle, a temperature sensor 10 is fixedly installed on the side of the oil inlet tank 2, and a temperature compensator 11 is installed on one side of the oil inlet tank 2. In specific application scenarios, the temperature sensor 10 can detect the temperature of the incoming oil, and the temperature compensator 11 can compensate for the temperature of the oil to ensure rapid detection.

[0021] Among them, such as Figure 1 , Figure 4 , Figure 5 , Figure 8 and Figure 9 The detection mechanism includes a connector 14 and a thin tube 17. The connector 14 is provided on the bottom surface of the oil inlet tank 2 and the top surface of the recovery tank 5. The two ends of the thin tube 17 are respectively connected to the oil inlet tank 2 and the recovery tank 5 through the connector 14. The outer side of the thin tube 17 is fixed with a detection element 18 connected to its internal oil circuit. The two ends of the detection mechanism are respectively connected to the oil inlet tank 2 and the recovery tank 5. The outer side of the connector 14 is threaded with a sleeve 15, and the inner side of the connector 14 is threaded with a plug 16. The connection between the connector 14 and the thin tube 17 is a threaded connection, and the plug 16 is also threaded with the thin tube 17. In specific application scenarios, both ends of the thin tube 17 are threaded, which facilitates the connection between the thin tube 17 and the connector 14. By rotating the plug 16 connected to the outside of the connector 14, the plug 16 can be connected to the thin tube 17 to ensure a sealed connection. The connector 14 is equipped with a valve. By opening the valve inside the connector 14 connected to the bottom of the oil inlet tank 2, oil can enter the interior of the thin tube 17 through the connector 14, so that the detection element 18 can be inserted into the detection end inside the thin tube 17 for online detection. The thin tubes 17 are arranged in parallel, and their detection does not affect each other, thereby improving detection accuracy. The connector 14 is provided with multiple sets, and the plug 16 can be connected inside, allowing selective connection of the thin tubes 17 to adjust the detection range.

[0022] Among them, such as Figure 1 and Figure 5 In the middle, the side of the recycling box 5 is integrated with a sample retention port 24, and the bottom of the sample retention port 24 is threadedly connected to a sample container 23; In specific application scenarios, after each test is completed, the oil inside the oil tank 2 flows into the oil tank 5 by opening the valve inside the connector 14 at the top of the recovery tank 5 and the valve at the top of the connecting pipe 7, so as to facilitate recovery. The recovery tank 5 is connected to the sample container 23 through the sample retention port 24. After opening the valve inside the sample container 23, some oil inside the recovery tank 5 can be input into the sample retention port 24 for sample retention, so as to facilitate the backtracking of test data.

[0023] Among them, such as Figure 1 , Figure 4 and Figure 5 In the middle, the front and rear sides of the oil inlet tank 2 near the top of the oil pipe 1 are respectively connected to the air pipe 13 and the cleaning water pipe 27. The bottom end of the air pipe 13 is connected to the recovery tank 5 to form an airflow circulation. The top side of the recovery tank 5 is connected to the air pump 12. The output end of the air pump 12 is connected to the air pipe 13 through a three-way valve, and the other end of the three-way valve is directly connected to the air. In specific application scenarios, the air pump 12 can suck out the inside of the recovery box 5 and send air into the top of the oil inlet pipe 3 through the air pipe 13 to form an air circulation, which facilitates the downward flow of oil and makes it easier to air dry after cleaning inside. At the same time, the air pump 12 can discharge the air inside the recovery box 5 through the three-way valve, so that the inside of the recovery box 5 forms a negative pressure, which facilitates the downward flow of oil inside the oil inlet tank 2.

[0024] Among them: such as Figure 3 , Figure 4 and Figure 5 In the middle, the inner side of the recovery tank 5 is connected to an oil pump 21 for hydraulic oil return; In specific application scenarios, the oil pump 21 can pump the tested oil from inside the recovery tank 5 into the oil pipe 1 through the pipeline for backflow. At the same time, the output end of the oil pump 21 is connected to the sewage pipe 22 through a three-way valve, so that oil and water can be discharged and collected during cleaning.

[0025] Among them: such as Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 10 In the middle, a fixing frame 4 is installed above the oil pipe 1. The top of the fixing frame 4 is fixedly connected to the oil inlet tank 2. A water tank 25 is fixed to the outside of the bottom of the fixing frame 4. A connecting plate 6 is integrally fixed to the bottom of the fixing frame 4. A recovery box 5 is fixedly installed on the outside of the connecting plate 6. The fixing frame 4 and the recovery box 5 are fixedly connected to the oil pipe 1. The end of the cleaning water pipe 27 is connected to the water tank 25. A cleaning agent tank 26 that can supply cleaning fluid to the cleaning water pipe 27 is installed on the outside of the water tank 25. The bottom end of the cleaning water pipe 27 passes through the cleaning agent tank 26 to the bottom surface of the water tank 25. A branch pipe 28 located inside the cleaning agent tank 26 is integrally installed in the middle of the cleaning water pipe 27. The bottom end of the branch pipe 28 is tapered and installed inside the cleaning agent tank 26. In specific application scenarios, after the oil is returned after oil testing, the air pump 12 creates negative pressure inside the recovery tank 5. The valve at the top of the cleaning water pipe 27 and the valve at the bottom of the branch pipe 28 are opened. Through the negative pressure inside the recovery tank 5, water from the water tank 25 is drawn into the oil inlet pipe 3 via the cleaning water pipe 27. Then, the water flows into the oil inlet tank 2, connecting pipe 7, thin pipe 17, and recovery tank 5 for rinsing. Through the connection between the cleaning water pipe 27 and the branch pipe 28, the water flow can draw in the cleaning solution from the cleaning agent tank 26 for cleaning. After cleaning, the wastewater is discharged through the wastewater pipe 22 via the oil pump 21. After cleaning, the internal parts are dried through air circulation between the recovery tank 5, air pump 12, air pipe 13, oil inlet pipe 3, and oil inlet tank 2 for the next test.

[0026] The above technical solution allows for the direct introduction of cleaning solution after testing, facilitating rapid cleaning and drying, and ensuring its effectiveness for the next test.

[0027] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention; the contents not described in detail in this specification belong to the prior art known to those skilled in the art; in addition, the directional terms such as up, down, left, right, front, and back in the text only represent their relative positions and not absolute positions.

[0028] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0029] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydraulic oil contamination detection device, comprising a pipeline (1) directly connected to a hydraulic oil pipeline, an oil inlet tank (2) for oil interception connected to the outside of the pipeline (1), a recovery tank (5) connected to the bottom of the oil inlet tank (2), and a detection mechanism arranged in parallel between the oil inlet tank (2) and the recovery tank (5). Its features are: The oil inlet tank (2) is connected to the pipeline oil pipe (1) through the oil inlet pipe (3) provided on its end face. The side of the oil inlet tank (2) is connected to the recovery tank (5) through the connecting pipe (7). The oil inlet tank (2) is provided with a pressure-reducing and speed-reducing mechanism inside. The detection mechanism is connected to the oil inlet tank (2) and the recovery tank (5) at both ends respectively. The recovery tank (5) is provided with a sample container (23) for sample retention on the side and an oil pump (21) for hydraulic oil return is connected to the inside of the recovery tank (5). The oil inlet tank (2) is connected to an air pipe (13) and a cleaning water pipe (27) on the front and rear sides of one end near the top surface of the oil pipe (1). The bottom end of the air pipe (13) is connected to the recovery tank (5) to form an airflow circulation. The end of the cleaning water pipe (27) is connected to a water tank (25). A cleaning agent tank (26) is provided on the outside of the water tank (25) to supply cleaning fluid to the cleaning water pipe (27).

2. The hydraulic oil contamination detection device according to claim 1, characterized in that: A fixing frame (4) is provided above the oil pipe (1). The top of the fixing frame (4) is fixedly connected to the oil inlet tank (2). A water tank (25) is fixed to the bottom outside of the fixing frame (4). A connecting plate (6) is integrally fixed to the bottom of the fixing frame (4). The recovery box (5) is fixedly installed on the outside of the connecting plate (6). The fixing frame (4) and the recovery box (5) are fixedly connected to the oil pipe (1).

3. The hydraulic oil contamination detection device according to claim 1, characterized in that: The pressure-reducing and speed-reducing mechanism is composed of a fixed plate (8) and a stacked plate (9). The fixed plate (8) is integrally fixed inside the oil inlet tank (2). The bottom width of the fixed plate (8) is the same as the internal width of the oil inlet tank (2). The outer side of the fixed plate (8) is integrally provided with a stacked plate (9). The width of the stacked plate (9) is smaller than the internal width of the oil inlet tank (2).

4. The hydraulic oil contamination detection device according to claim 1, characterized in that: A temperature sensor (10) is fixedly installed on the side of the oil inlet tank (2), and a temperature compensator (11) is installed on one side of the oil inlet tank (2).

5. The hydraulic oil contamination detection device according to claim 1, characterized in that: The top surface of the recycling box (5) is connected to an air pump (12). The output end of the air pump (12) is connected to the air pipe (13) through a three-way valve, and the other end of the three-way valve is directly connected to the air.

6. The hydraulic oil contamination detection device according to claim 1, characterized in that: The testing institutions include: Connector (14), which is provided on the bottom surface of the oil inlet tank (2) and the top surface of the recovery tank (5); The thin tube (17) has its two ends connected to the oil inlet tank (2) and the recovery tank (5) respectively via connectors (14). The outer side of the thin tube (17) is fixed with a detection element (18) connected to its internal oil circuit.

7. A hydraulic oil contamination detection device according to claim 6, characterized in that: The outer side of the connector (14) is threaded with a sleeve (15), and the inner side of the connector (14) is threaded with a plug (16). The connection between the connector (14) and the thin tube (17) is a threaded connection, and the plug (16) is also threaded with the thin tube (17).

8. The hydraulic oil contamination detection device according to claim 1, characterized in that: The side of the recycling box (5) is integrated with a sample retention port (24), and the bottom of the sample retention port (24) is threadedly connected to a sample container (23).

9. A hydraulic oil contamination detection device according to claim 1, characterized in that: The bottom end of the cleaning water pipe (27) extends through the detergent tank (26) to the bottom surface of the water tank (25). A branch pipe (28) is integrally provided in the middle of the cleaning water pipe (27) and located inside the detergent tank (26). The bottom end of the branch pipe (28) is tapered and located inside the detergent tank (26).

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