Equipment for detecting moisture content of lubricating oil

Abstract

The invention relates to the technical field of lubricating oil detection, in particular to lubricating oil moisture content detection equipment which comprises an oil pool and a detection table and further comprises an automatic sampling mechanism, and the automatic sampling mechanism is used for extracting lubricating oil in the oil pool and conveying the lubricating oil to a detector on the detection table for detection through a flow pump and a sampling pipe; the automatic sampling mechanism comprises a lifting support, the telescopic end of the lifting support is connected with a sampling probe, the lifting support is used for driving the sampling probe to be inserted into oil in the oil pool, and an ultrasonic transducer is installed on the sampling probe and used for locally stirring the sampling position of the oil. The problem of uneven local moisture of sampling points is solved through local stirring, the problem of uneven overall moisture distribution of an oil pool is solved through stratified sampling, the detection precision of the moisture content of lubricating oil is high through cooperation of local stirring and stratified sampling, the detection efficiency is improved, meanwhile, the equipment maintenance cost and manual operation errors are reduced, and the detection accuracy is improved. The method is a key technical combination for improving the detection accuracy of the water content of lubricating oil.

Description

Technical Field

[0001] The present invention relates to the technical field of lubricating oil detection, and in particular to a device for detecting the water content of lubricating oil. Background Art

[0002] The introduction of water disrupts the continuity of the lubricating oil film, leading to direct contact between metal surfaces. Water emulsifies with the lubricating oil base, significantly increasing viscosity and reducing cooling and heat dissipation capabilities. The water content in lubricating oil directly affects its quality. Recycled waste oil contains complex components such as oxidized polymers and metal salts, making it difficult to eliminate interference through simple pretreatment using existing methods. Karl Fischer analysis revealed a water content of 1.5% for a waste oil sample, but after dehydration, the actual water content was only 0.7%, an error of 114%. The water content in waste lubricating oil directly affects the detection of other parameters.

[0003] To detect moisture in oil, existing technologies generally rely on manual sampling followed by capacitance, microwave, or distillation methods. However, moisture in oil can stratify due to factors such as gravity and temperature (e.g., higher moisture content at the bottom). If sampling is performed from a single location, the measured value can easily deviate from the true level. In samples that are not fully homogenized, moisture can settle at the bottom. Manual sampling of only the upper layer can result in a discrepancy of over 50% in the measured value. To address this issue, we propose a device for detecting moisture in lubricating oil. Summary of the Invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes a lubricating oil water content detection device, which has the characteristics of automated multi-point sampling and partitioned stirring to improve detection accuracy, and solves the problem of poor detection accuracy caused by existing lubricating oil water content detection sampling.

[0005] The present invention provides the following technical solution: a lubricating oil water content detection device, comprising an oil pool and a detection platform, and also comprising an automatic sampling mechanism, wherein the automatic sampling mechanism is used to extract the lubricating oil in the oil pool and transport it to the detector on the detection platform for detection through a flow pump and a sampling tube.

[0006] The automatic sampling mechanism includes a lifting bracket, which utilizes a screw structure driven by an electric push rod or servo motor. The lifting bracket's telescopic end is adjustable from 0 to 200 cm, driving the vertical movement of a sampling probe. The telescopic end of the lifting bracket is connected to the sampling probe, which is used to insert the sampling probe into the oil in the oil pool. The sampling probe is mounted on an ultrasonic transducer for localized agitation of the oil at the sampling point. The ultrasonic transducer converts high-frequency electrical signals into mechanical vibrations, generating cavitation in the oil. No mechanical parts come into contact with the oil, preventing wear of the stirring paddle and the generation of metal particles that could contaminate the oil sample.

[0007] Preferably, a linear displacement sensor for monitoring the probe height is provided on the lifting bracket, the sampling probe is connected to the telescopic end of the lifting bracket through the lifting plate, the linear displacement sensor is fixed on the fixed end of the lifting bracket, and the probe of the linear displacement sensor is connected to the lifting plate.

[0008] Preferably, a supporting mechanism is provided at the bottom of the lifting bracket.

[0009] Preferably, the flow pump is installed on a lifting bracket, with its input end connected to the sampling probe and its output end connected to the sampling tube.

[0010] Preferably, a mixing module is further provided between the sampling tube and the detector, and the mixing module is used to mix the oil samples from different areas extracted by the sampling probe.

[0011] The mixing module includes a mixing box, a stirring motor is installed in the mixing box, and a stirring blade is provided on the rotating shaft of the stirring motor. The stirring motor is used to drive the stirring blade to rotate and mix the oil sample.

[0012] Preferably, the hybrid module also includes a movable kit, a rotating part, a telescopic rod and a power supply structure. The movable kit is sleeved on the outside of the rotating shaft. The rotating part is rotatably connected to the rotating shaft. One end of the telescopic rod is fixed to the movable kit, and the other end is fixedly connected to the rotating part, so that the movable kit can be lifted and rotated relative to the rotating shaft under the drive of the telescopic rod.

[0013] The upper end of the stirring blade is rotatably connected to the movable kit via a first fixing buckle, and the lower end of the stirring blade is rotatably connected to the rotating shaft via a second fixing buckle. The stirring blade is fixed to the movable kit and the rotating shaft via upper and lower end points, and the inclination angle of the stirring blade is adjusted by adjusting the position of the movable kit relative to the rotating shaft. The telescopic rod is driven by a power supply structure, driving the movable kit to move axially along the rotating shaft and rotate circumferentially around the rotating shaft; the upper end of the stirring blade moves with the movable kit, and the lower end is fixed to the rotating shaft, so the inclination angle of the stirring blade can be adjusted between 30° and 60°. For example, when the movable kit rises 5mm, the inclination angle of the stirring blade increases from 45° to 55°, and the shear force is enhanced; when the movable kit rotates 10°, the rotation direction of the stirring blade forms an angle with the rotation direction of the rotating shaft, generating a spiral flow field.

[0014] The adjustable inclination design enables the stirring blade to adapt to oils of different viscosities: low-viscosity oils require strong shearing force to break up water agglomerates, while high-viscosity oils require weak shearing force to reduce energy consumption and avoid oil temperature rise.

[0015] Preferably, an impurity removal module is further provided between the sampling tube and the detector, and the impurity removal module is used to remove impurities in the oil sample.

[0016] The impurity removal module includes a dust removal box, which houses a removable filter layer secured by a sealing buckle. This removable design reduces filter layer replacement time to less than 5 minutes (compared to traditional integrated filters, which require disassembly of the entire pipe, taking 15-30 minutes), reducing maintenance costs.

[0017] The sealed chamber prevents the oil sample from coming into contact with the air and absorbing moisture (when the air humidity is ≥60%, the moisture content of the oil can increase by 0.01% after being exposed for 5 minutes), ensuring that the impurity removal process does not introduce additional moisture to interfere with the detection.

[0018] Preferably, the filter layer includes a first filter layer, on which a magnetic filter element is mounted, and the first filter layer is fixed by a first sealing buckle. The magnetic filter element can remove more than 95% of ferromagnetic impurities (for example, a rolling mill oil sample containing 0.1% iron chips can be reduced to 0.005% after passing through the magnetic filter element), thus preventing the iron chips from absorbing moisture and causing falsely high test values ​​(the moisture absorbed on the surface of the iron chips accounts for 10-20% of the total moisture).

[0019] Preferably, the filter layer includes a second filter layer, on which a filter membrane is mounted, and the second filter layer is secured by a second sealing buckle. The filter membrane can remove 99% of non-magnetic particles (for example, if waste oil contains 0.5% sludge, the sludge content is reduced to 0.005% after passing through the filter membrane), preventing particles from clogging the detector's inlet (for example, the inner diameter of the Karl Fischer instrument's injection needle is 0.5 mm, and particle clogging can result in inaccurate injection volume).

[0020] Preferably, an extraction module is further provided between the sampling tube and the detector, and the extraction module is used to remove polar compounds in the oil sample.

[0021] The extraction module includes an extraction box containing a solid-phase extraction column, connected to an injection and drainage tube. Solid-phase extraction can remove over 80% of polar interfering substances (for example, a lubricant containing 0.5% carboxylic acid can reduce the carboxylic acid content to 0.1% after extraction), preventing polar substances from affecting the dielectric constant measurement of the capacitance method (polar substances increase the dielectric constant, causing the water content to be falsely determined to be too high).

[0022] The present invention provides a device for detecting the water content of lubricating oil, which adopts multi-point sampling, that is, sampling the upper, middle and lower layers and then mixing them for testing. This avoids the possibility that uneven sampling will lead to deviation in the results because water may settle or float due to density differences. An ultrasonic transducer is built into the sampling probe to emit high-frequency sound waves (20-100kHz) to produce a cavitation effect in the local area, destroying the water agglomerates in the oil. Before sampling, the local area is quickly stirred to ensure that the sampling points are uniform. Compared with the randomness of manual sampling, the repeatability error of automated sampling can be controlled within ±2%, and it avoids the problems of oil absorbing moisture from contact with air and residual contamination of sampling tools during manual operation, thereby improving the reliability of detection data from the source. It solves the problem of poor detection accuracy caused by existing sampling for lubricating oil water content detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] Figure 2 Schematic diagram of the hybrid module structure of the present invention.

[0025] Figure 3 It is a structural schematic diagram of the rotating shaft and movable kit of the present invention.

[0026] Figure 4 This is a structural diagram of the impurity removal module of the present invention.

[0027] Figure 5 This is a schematic diagram of the extraction module structure of the present invention.

[0028] In the figure: 1, oil pool; 2, lifting bracket; 3, lifting plate; 4, sampling probe; 5, ultrasonic transducer; 6, supporting mechanism; 7, testing table; 8, detector; 9, sampling tube; 10, linear displacement sensor; 11, flow pump; 12, mixing module; 1201, mixing box; 1202, stirring motor; 1203, rotating shaft; 1204, stirring blade; 1205, movable kit; 1206, rotating part; 1207, telescopic rod; 120 8. Power supply structure; 1209. First fixing buckle; 1210. Second fixing buckle; 13. Impurity removal module; 1301. Impurity removal box; 1302. First filter layer; 1303. Second filter layer; 1304. Magnetic filter element; 1305. Filter membrane; 1306. First sealing buckle; 1307. Second sealing buckle; 14. Extraction module; 1401. Extraction box; 1402. Solid phase extraction column; 1403. Injection tube; 1404. Discharge tube. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] like Figure 1 As shown, the present invention provides a technical solution: a lubricating oil water content detection device, including an oil pool 1 and a detection table 7, and also including an automatic sampling mechanism, the automatic sampling mechanism is used to extract the lubricating oil in the oil pool 1 and transport it to the detector 8 on the detection table 7 through a flow pump 11 and a sampling tube 9 for detection.

[0031] The automatic sampling mechanism includes a lifting bracket 2, which utilizes a screw structure driven by an electric push rod or servo motor. The telescopic end of the lifting bracket 2 is adjustable from 0 to 200 cm, driving the vertical movement of a sampling probe 4. The sampling probe 4 is connected to the telescopic end of the lifting bracket 2 and is used to insert the sampling probe 4 into the oil in the oil reservoir 1. The sampling probe 4 is mounted on an ultrasonic transducer 5, which is used to locally agitate the oil at the sampling point. The ultrasonic transducer 5 converts high-frequency electrical signals into mechanical vibrations, generating cavitation in the oil. No mechanical parts come into contact with the oil, preventing metal particle contamination of the oil sample from wear of the stirring paddle.

[0032] The automatic sampling mechanism drives the sampling probe 4 vertically via the telescopic end of the lifting bracket 2 (e.g., a motorized push rod or lead screw structure), enabling controlled depth control of the probe within the oil pool 1 (e.g., layered insertion from the liquid surface to the pool bottom). The ultrasonic transducer 5 on the sampling probe 4 receives a high-frequency electrical signal (20-100 kHz), generating mechanical vibrations that induce cavitation in the oil. Liquid molecules are vibrated to form tiny bubbles. These bubbles rupture in the high-pressure zone, releasing microjets (at speeds up to 100 m / s) and shock waves (at pressures of 10-100 MPa). These microjets disrupt water aggregates (e.g., the interfacial film of emulsified water droplets or free water clusters deposited at the bottom), resulting in uniform mixing of the oil and water near the sampling point. Finally, a flow pump 11 (e.g., a peristaltic pump) delivers the homogenized oil sample to the detector 8 via the sampling tube 9, avoiding detection errors caused by localized water distribution.

[0033] The core function of localized stirring is to resolve the problem of oil stratification. Due to the high viscosity and low water content of lubricating oil (typically 0.01%-1%), water tends to distribute as tiny droplets or emulsions. Long-term stagnant conditions can lead to density stratification (lighter at the top and heavier at the bottom) (water density greater than oil). Localized stirring quickly breaks up these stratifications. It also avoids the drawbacks of global stirring (e.g., stirring the entire tank), which consumes significant time (tens of minutes) and energy and can introduce bubbles or exacerbate oil oxidation. Localized stirring, focusing on a 5-10 cm³ area near the sampling point, improves efficiency by 5-10 times.

[0034] A linear displacement sensor 10 is mounted on the lifting bracket 2 to monitor the probe height. The sampling probe 4 is connected to the telescopic section of the lifting bracket 2 via the lifting plate 3. The linear displacement sensor 10 is fixed to the fixed end of the lifting bracket 2, and its probe is connected to the lifting plate 3. The linear displacement sensor 10 (e.g., a magnetostrictive or resistive type) is fixed to the fixed end of the lifting bracket 2, and its detection probe is in direct contact with the lifting plate 3 (connected to the sampling probe 4). As the telescopic section of the lifting bracket 2 drives the lifting plate 3 up and down, the linear displacement sensor 10 detects the displacement of the lifting plate 3 in real time (e.g., 0-200 cm) and converts the mechanical displacement into an electrical signal (e.g., a 4-20 mA current signal) that is fed back to the control system. The control system compares the current displacement signal with the preset layer depth (e.g., 10 cm for the upper layer, 50 cm for the middle layer, and 90 cm for the lower layer) to adjust the extension and retraction of the lifting bracket 2, achieving closed-loop control of the sampling probe 4 depth, ensuring that the probe accurately reaches the target sampling position (with a repeatability of ±0.1 mm).

[0035] The local stirring strategy for sampling at different depths is divided into three layers: upper, middle, and lower. The bottom layer, 5-10 cm from the pool bottom, is where water easily settles due to its high density. Local stirring (stirring time: 3-5 seconds) is necessary to ensure even dispersion of the water at the bottom layer and avoid excessive moisture content during sampling. The middle layer, halfway up the oil pool, contains the bulk of the oil. Stirring time can be shortened to 1-2 seconds, primarily to eliminate localized emulsions or agglomeration of tiny droplets. The upper layer, 5-10 cm from the liquid surface, is easily affected by air humidity and may have a lower moisture content. The purpose of stirring is to mix the surface oil with the lower layer. A stirring time of 2-3 seconds is sufficient.

[0036] A support mechanism 6 is installed at the bottom of the lifting bracket 2. This mechanism, such as an adjustable tripod or suction cup base, compensates for tilting caused by oil pool vibrations (e.g., 10-50 Hz vibrations during pump startup) or surface unevenness (slopes within ±5°) by increasing its contact area with the ground (support area ≥ 0.5 m² when the tripod legs are extended) or by vacuum suction (air pressure within the suction cup < 80 kPa). By adjusting the height of the tripod legs or the suction force of the suction cup, the support mechanism 6 ensures that the lifting bracket 2 remains perpendicular to the oil pool surface (verticality deviation < 0.5°), preventing the sampling probe 4 from deviating from the target depth (e.g., a target of 50 cm with an actual deviation of < 0.5 cm) due to bracket movement or obstructing the sampling port from the pool wall during tilted insertion. Alternatively, the support mechanism 6 can be configured as a two-dimensional movable platform to achieve horizontal and vertical displacement, adjusting the horizontal position of the sampling point.

[0037] The flow pump 11 is mounted on the lifting bracket 2, with its input end connected to the sampling probe 4 and its output end connected to the sampling tube 9. The flow pump 11 (such as a constant-flow peristaltic pump) is integrated into the lifting bracket 2, with its input end connected to the sampling probe 4 via a pipeline, and its output end communicating with the sampling tube 9. The pump body drives rollers (≥3) through a stepper motor to periodically squeeze an elastic tube (such as a silicone tube), creating positive displacement pumping and generating a stable suction pressure (0.1-0.5 MPa), sucking the oil sample from the sampling probe 4 and pushing it into the sampling tube 9. The pump speed is adjusted by a control system (accuracy ±0.1 rpm), which can precisely control the sampling flow rate (adjustable from 5 to 50 mL / min), ensuring that the oil flows in a laminar state in the pipeline (Reynolds number <2000) and preventing turbulent disturbances from disrupting the uniformity after ultrasonic stirring.

[0038] A mixing module 12 is also provided between the sampling tube 9 and the detector 8. The mixing module 12 is used to mix the oil samples from different areas extracted by the sampling probe 4. Figure 2 and 3 As shown, the mixing module 12 includes a mixing box 1201, in which a stirring motor 1202 is installed, and a stirring blade 1204 is provided on the rotating shaft 1203 of the stirring motor 1202, and the stirring motor 1202 is used to drive the stirring blade 1204 to rotate and mix the oil sample.

[0039] The mixing module 12 also includes a movable kit 1205, a rotating member 1206, a telescopic rod 1207, and a power supply structure 1208. The movable kit 1205 is sleeved on the outside of the rotating shaft 1203, and the rotating member 1206 is rotatably connected to the rotating shaft 1203. One end of the telescopic rod 1207 is fixed to the movable kit 1205, and the other end is fixedly connected to the rotating member 1206, so that the movable kit 1205 can be raised and lowered and rotated relative to the rotating shaft 1203 under the drive of the telescopic rod 1207. The upper end of the stirring blade 1204 is rotatably connected to the movable kit 1205 via a first fixing buckle 1209, and the lower end of the stirring blade 1204 is rotatably connected to the rotating shaft 1203 via a second fixing buckle 1210. The stirring blade 1204 is fixed to the movable kit 1205 and the rotating shaft 1203 at its upper and lower ends. The inclination angle of the stirring blade 1204 can be adjusted by adjusting the position of the movable kit 1205 relative to the rotating shaft 1203.

[0040] A telescopic rod 1207 (e.g., an electric push rod with a stroke of 5-20 mm) is driven by a power supply structure 1208 (e.g., a miniature lithium battery or an external power supply), driving the movable assembly 1205 to move axially (raise and lower) along the rotating shaft 1203 and rotate circumferentially around the rotating shaft 1203. The upper end of the stirring blade 1204 moves with the movable assembly 1205, while the lower end is fixed to the rotating shaft 1203. Therefore, the inclination angle of the stirring blade 1204 (the angle with the rotation direction of the rotating shaft 1203, where the rotating shaft 1203 rotates horizontally) can be adjusted between 30° and 60°. For example, when the movable assembly 1205 rises 5 mm, the inclination angle of the stirring blade 1204 increases from 45° to 55°, thereby enhancing the shear force. When the movable assembly 1205 rotates 10°, the rotation direction of the stirring blade 1204 forms an angle with the rotation direction of the rotating shaft 1203, generating a spiral flow field. In addition, by adjusting the inclination angle of the stirring blade 1204, a downward suction force is generated during stirring to suppress air from being drawn in.

[0041] The adjustable inclination angle of the stirring blades 1204 allows them to adapt to oils of varying viscosities: low-viscosity oils (such as hydraulic oil, viscosity 32mPa·s) require strong shear forces (60° inclination) to break up water aggregates, while high-viscosity oils (such as gear oil, viscosity 150mPa·s) require weak shear forces (30° inclination) to reduce energy consumption and prevent oil temperature rise (heating causes water evaporation). The automatic sampling mechanism's mixing module 12 completes three-layer localized stirring in 10 seconds, with sample moisture content deviation within ±3%. This improves efficiency by over 80% compared to traditional global stirring, making it particularly suitable for online testing scenarios.

[0042] A cleaning module 13 is also provided between the sampling tube 9 and the detector 8. The cleaning module 13 is used to remove impurities in the oil sample. Figure 4As shown, the impurity removal module 13 includes an impurity removal box 1301, which houses a removable filter layer secured by a sealing buckle. This removable design reduces filter layer replacement time to less than 5 minutes (compared to traditional integrated filters, which require disassembly of the entire pipeline, taking 15-30 minutes), reducing maintenance costs. The sealed chamber prevents the oil sample from absorbing moisture through contact with air (when air humidity is ≥60%, exposure to oil for 5 minutes can increase its moisture content by 0.01%), ensuring that the impurity removal process does not introduce additional moisture that could interfere with detection.

[0043] The filter layer includes a first filter layer 1302, on which a magnetic filter element 1304 is mounted and secured by a first sealing buckle 1306. Magnetic filter element 1304 can remove over 95% of ferromagnetic impurities. For example, an oil sample containing 0.1% iron filings can be reduced to 0.005% after passing through magnetic filter element 1304, preventing the iron filings from absorbing moisture and causing falsely high test values. Water adsorbed on the surface of the iron filings accounts for 10-20% of the total water content. The filter layer includes a second filter layer 1303, on which a filter membrane 1305 is mounted and secured by a second sealing buckle 1307. The filter membrane 1305 can remove 99% of non-magnetic particles. The waste oil contains 0.5% sludge. After passing through the filter membrane 1305, the sludge content can be reduced to 0.005%, thereby preventing particles from clogging the injection port of the detector 8. For example, the inner diameter of the injection needle of the Karl Fischer instrument is 0.5 mm. Particle clogging will lead to inaccurate injection volume.

[0044] An extraction module 14 is also provided between the sampling tube 9 and the detector 8. The extraction module 14 is used to remove polar compounds in the oil sample. Figure 5 As shown, extraction module 14 includes an extraction box 1401, which houses a solid-phase extraction column 1402. Extraction box 1401 is connected to an injection tube 1403 and a drain tube 1404. When the oil sample flows through extraction column 1402, polar interfering substances are retained by the adsorbent, while non-polar oil and water (polarity index 2.9) flow out with the oil and enter detector 8. When extraction column 1402 is saturated, an eluent (e.g., methanol, polarity index 5.1) is injected through injection tube 1403. Polarity competition elutes the adsorbed impurities, and the waste eluent is discharged through drain tube 1404. This process prevents polar substances from interfering with detection principles such as capacitance and dielectric constant methods (polar substances increase the dielectric constant, resulting in an erroneous determination of a high water content).

[0045] Solid-phase extraction can remove more than 80% of polar interferences (for example, a lubricating oil containing 0.5% carboxylic acid will have its carboxylic acid content reduced to 0.1% after extraction), preventing polar substances from affecting the dielectric constant measurement of the capacitance method (polar substances will increase the dielectric constant, causing the water content to be mistakenly judged as high). The solid-phase extraction column 1402 uses polar adsorbents (such as silica gel and alumina) to capture polar compounds in the oil and retain the non-polar oil matrix. Operation steps: Activate the column: Rinse the SPE column with methanol and n-hexane in sequence. Loading: Slowly pass the sample solution through the column, and the polar compounds are adsorbed. Elution: Elute the oil matrix with a non-polar solvent (such as n-heptane) and collect the eluate. Specific polar substances, such as carboxylic acids and phenols, can be quantitatively removed.

[0046] The detector 8 uses a fully automatic titrator, specifically a Mettler-Toledo V20 Karl Fischer titrator or a Swiss Metrohm 899 Coulometric Karl Fischer titrator. After the extraction box 1401 completes the removal of polar compounds, the oil sample enters the injection module of the titrator through the drain pipe 1404 (connected to the sampling tube 9).

[0047] In the present invention, the problem of "uneven local moisture at the sampling point" is solved by local stirring, and the problem of "uneven overall moisture distribution in the oil pool" is solved by stratified sampling. The two work together to increase the accuracy of lubricating oil water content detection and improve detection efficiency (single detection time is shortened from 30 minutes to 10 minutes), while reducing equipment maintenance costs (no mechanical stirring wear) and human operation errors. It is a key technical combination to improve the accuracy of lubricating oil water content detection.

[0048] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A lubricating oil water content detection device, comprising an oil pool (1) and a detection table (7), characterized in that: It also includes an automatic sampling mechanism, which is used to extract lubricating oil from the oil pool (1) and transport it to the detector (8) on the detection table (7) for detection through a flow pump (11) and a sampling tube (9); The automatic sampling mechanism comprises a lifting bracket (2), a sampling probe (4) is connected to the telescopic end of the lifting bracket (2), the lifting bracket (2) is used to drive the sampling probe (4) to be inserted into the oil in the oil pool (1), an ultrasonic transducer (5) is installed on the sampling probe (4), and the ultrasonic transducer (5) is used to locally stir the sampling location of the oil.

2. The lubricating oil water content detection device according to claim 1, characterized in that: A linear displacement sensor (10) for monitoring the height of the probe is provided on the lifting bracket (2); the sampling probe (4) is connected to the telescopic end of the lifting bracket (2) via the lifting plate (3); the linear displacement sensor (10) is fixed to the fixed end of the lifting bracket (2); and the probe of the linear displacement sensor (10) is connected to the lifting plate (3).

3. The lubricating oil water content detection device according to claim 2, characterized in that: A supporting mechanism (6) is provided at the bottom of the lifting bracket (2).

4. The lubricating oil water content detection device according to claim 2, characterized in that: The flow pump (11) is installed on the lifting bracket (2), with its input end connected to the sampling probe (4) and its output end connected to the sampling tube (9).

5. The lubricating oil water content detection device according to claim 4, characterized in that: A mixing module (12) is further provided between the sampling tube (9) and the detector (8), and the mixing module (12) is used to mix the oil samples from different areas extracted by the sampling probe (4); The mixing module (12) comprises a mixing box (1201), a stirring motor (1202) is installed in the mixing box (1201), and a stirring blade (1204) is provided on the rotating shaft (1203) of the stirring motor (1202), and the stirring motor (1202) is used to drive the stirring blade (1204) to rotate and mix the oil sample.

6. The lubricating oil water content detection device according to claim 5, characterized in that: The hybrid module (12) further comprises a movable kit (1205), a rotating member (1206), a telescopic rod (1207) and a power supply structure (1208); the movable kit (1205) is sleeved on the outside of the rotating shaft (1203); the rotating member (1206) is rotatably connected to the rotating shaft (1203); one end of the telescopic rod (1207) is fixed to the movable kit (1205), and the other end is fixedly connected to the rotating member (1206), so that the movable kit (1205) can be lifted and rotated relative to the rotating shaft (1203) under the drive of the telescopic rod (1207); The upper end of the stirring blade (1204) is rotatably connected to the movable kit (1205) via a first fixing buckle (1209), and the lower end of the stirring blade (1204) is rotatably connected to the rotating shaft (1203) via a second fixing buckle (1210). The stirring blade (1204) is fixed to the movable kit (1205) and the rotating shaft (1203) via upper and lower end points, and the inclination angle of the stirring blade (1204) is adjusted by adjusting the position of the movable kit (1205) relative to the rotating shaft (1203).

7. The lubricating oil water content detection device according to claim 4, characterized in that: A decontamination module (13) is further provided between the sampling tube (9) and the detector (8), and the decontamination module (13) is used to remove impurities in the oil sample; The impurity removal module (13) comprises an impurity removal box (1301), wherein a detachable filter layer is provided in the impurity removal box (1301), and the filter layer is fixed by a sealing buckle.

8. The lubricating oil water content detection device according to claim 7, characterized in that: The filter layer comprises a first filter layer (1302), a magnetic filter element (1304) is mounted on the first filter layer (1302), and the first filter layer (1302) is fixed by a first sealing buckle (1306).

9. The lubricating oil water content detection device according to claim 7, characterized in that: The filter layer comprises a second filter layer (1303), a filter membrane (1305) is mounted on the second filter layer (1303), and the second filter layer (1303) is fixed by a second sealing buckle (1307).

10. The lubricating oil water content detection device according to claim 4, characterized in that: An extraction module (14) is further provided between the sampling tube (9) and the detector (8), and the extraction module (14) is used to remove polar compounds in the oil sample; The extraction module (14) comprises an extraction box (1401), a solid phase extraction column (1402) is arranged in the extraction box (1401), and an injection pipe (1403) and a discharge pipe (1404) are connected to the extraction box (1401).

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