A kind of on-line oil content detection device for carbon hydrogen cleaning solution of cleaning machine

Abstract

The application discloses a kind of online oil content detection devices for carbon hydrogen cleaning fluid of cleaning machine, it is related to the technical field of oil detection, including separator, detection straight pipe and temperature control component, separator is hollow inside, separator includes straight cylinder section and inner diameter tapering cone cylinder section from top to bottom in sequence, straight cylinder section top outer wall is communicated with liquid inlet pipe along the tangent direction of itself, cone cylinder section side wall is communicated with liquid outlet pipe, and cone cylinder section is used to separate metal residue and bubble in the cleaning fluid to be measured;Detection straight pipe is coaxially placed in separator, and the top end of detection straight pipe is located in the middle region of separator, for sampling oil-containing cleaning fluid after separation, detection straight pipe bottom end is set with detection module and passes through the bottom of separator, for detecting the sampling cleaning fluid;Temperature control component is set in detection straight pipe, for real-time sensing the temperature of cleaning fluid in separator, to control the opening and closing of internal passage of detection straight pipe.The application has the effect of improving the accuracy of cleaning fluid oil content detection.

Description

Technical Field

[0001] This application relates to the technical field of oil detection, and in particular to an online oil content detection device for hydrocarbon cleaning fluid used in cleaning machines. Background Technology

[0002] Industrial cleaning machines are indispensable core equipment in modern machining, automobile manufacturing and other industries. They are mainly used for surface treatment of machined parts, welded components or precision components. They are mainly used to remove cutting oil, rust-preventive oil, stamping and drawing oil, as well as attached metal burrs and dust that remain on the surface of the workpiece during the previous processing, thereby ensuring an extremely high degree of cleanliness of the workpiece surface to meet the strict surface quality requirements of subsequent assembly, welding, painting or electroplating processes.

[0003] During the cleaning process, the cleaning machine heats a specialized hydrocarbon cleaning solution to a working temperature of 60-80℃, and then applies it to the workpiece surface via high-pressure spraying or a combination of ultrasonic vibration. The oil content in the cleaning solution gradually increases during the cleaning process, necessitating real-time monitoring. Currently, common online oil content detection methods involve connecting an optical detection instrument to the circulation pipeline of the cleaning machine. This instrument utilizes the changes in refractive index or transmittance produced when a light beam passes through a cleaning solution containing different concentrations of grease, and an electronic system calculates and outputs real-time oil content data.

[0004] Although optical detection methods can achieve real-time online monitoring of oil content in water, the cleaning fluid inevitably generates a large number of tiny bubbles during high-speed pumping and ultrasonic oscillation, and contains metal residues, which can lead to a decrease in the accuracy of the detection data. High-hardness metal residues can even directly scratch the precision optical lens. At the same time, the cleaning fluid at high temperature washing the optical detection lens for a long time can easily cause severe thermal drift of the optical components and accelerate the thermal aging and failure of the lens sealing assembly, ultimately leading to irreversible damage to the optical detection equipment. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides an online oil content detection device for hydrocarbon cleaning fluid used in cleaning machines.

[0006] This application provides an online oil content detection device for hydrocarbon cleaning fluid used in cleaning machines, which adopts the following technical solution: An online oil content detection device for hydrocarbon cleaning fluid used in cleaning machines, comprising: The separator is hollow inside and consists of a straight section and a tapered section with a gradually decreasing inner diameter from top to bottom. The top outer wall of the straight section is connected to the liquid inlet pipe along its own tangential direction, and the side wall of the tapered section is connected to the liquid outlet pipe. The tapered section is used to separate metal residues and bubbles in the cleaning solution to be tested. The detection straight tube is coaxially placed inside the separator, with its top end located in the middle area of ​​the separator. It is used to sample the oily cleaning fluid after separation. The bottom end of the detection straight tube extends out of the bottom of the separator and is equipped with a detection module, which is used to detect the sampled cleaning fluid through optical means. The temperature control component is located inside the detection straight tube and is used to sense the temperature of the cleaning fluid inside the separator in real time in order to control the opening and closing of the internal channels of the detection straight tube.

[0007] Optionally, the detection straight tube includes a sampling section, a mixing section and a detection section from top to bottom. The sampling section is used to sample the separated oily cleaning fluid, the mixing section is used to introduce external cleaning fluid to mix and cool the sampled cleaning fluid, and the detection module is set in the detection section.

[0008] Optionally, a sampling tube is provided on the top sidewall of the sampling section. Multiple sampling tubes are provided and are distributed circumferentially around the detection straight tube. The height of the end of each sampling tube away from the detection straight tube is higher than the end closer to the detection straight tube. The inlet end of the sampling tube is located below the liquid inlet tube.

[0009] Optionally, the temperature control component includes a first temperature control element and a first sealing block. The first sealing block slides vertically and is sealed to the inner wall of the sampling section. During the vertical sliding process, the first sealing block can open and close one end of the outlet of all the sampling tubes. The top end of the first temperature control element is connected to the inner wall of the sampling section, and the bottom end is connected to the top of the first sealing block. The first temperature control element is used to be placed in the cleaning solution and to sense the temperature of the cleaning solution in real time. The first temperature control element is configured to contract when heated and drive the first sealing block to open the sampling tube.

[0010] Optionally, the mixing section includes, from top to bottom, interconnected mixing inlet, mixing throat, and mixing outlet. The inner diameter of the mixing throat is smaller than the inner diameters of the mixing inlet and mixing outlet. The mixing section also includes an external mixing pipe, one end of which is connected to the mixing throat, and the other end of which is used to connect to a low-temperature or room-temperature cleaning solution.

[0011] Optionally, the temperature control component includes a second temperature control element and a second sealing block. The second sealing block is vertically slidably connected inside the detection straight tube. The second temperature control element is placed in the inner cavity of the mixing section below the second sealing block. The top end of the second temperature control element is connected to the second sealing block, and the bottom end is connected to the inner wall of the mixing section. The second temperature control element is configured to shrink when heated and drive the second sealing block to seal the mixing inlet of the mixing section, so as to block the cleaning fluid from entering the mixing section.

[0012] Optionally, both the first and second temperature control components are made of shape memory alloy, so that the first and second temperature control components can shrink themselves after being heated, and the phase transition temperature of the second temperature control component is lower than that of the first temperature control component.

[0013] Optionally, a rectifier section is further provided between the mixing section and the detection section. The rectifier section connects the mixing section and the detection section. A rectifier plate is hinged in the rectifier section. A linkage rod is coaxially provided in the detection straight tube. The linkage rod passes through the detection section and the mixing section. The top of the linkage rod is connected to the bottom of the first sealing block. The bottom of the linkage rod passes downward coaxially and is slidably connected to the second sealing block. The bottom end of the linkage rod is connected to the rectifier plate through a linkage pull rope. When the first sealing block slides upward, the linkage rod pulls the rectifier plate to rotate to conduct the rectifier section, so as to rectify the mixed cleaning liquid.

[0014] In summary, this application includes at least one of the following beneficial effects: 1. By designing the separator as a straight cylindrical section and a conical section from top to bottom, the inner diameter of the conical section gradually narrows from top to bottom. A liquid inlet pipe is tangentially connected to the outer wall of the top of the straight section. After cleaning the parts, the high-temperature cleaning fluid enters the straight section along the wall of the tangential liquid inlet pipe. The high-temperature cleaning fluid enters the separator and spirals down along the inner wall of the separator. Due to the gradual narrowing of the inner diameter of the conical section, the liquid flow velocity gradually increases, and the centrifugal force is further enhanced. This more efficiently throws the impurity particles carried in the cleaning fluid to the area close to the inner wall of the conical section, forming an outer ring of impurities. At the same time, lighter bubbles gather and float to the center area, forming a bubble column in the center area. The ring between the outer ring of impurities and the central bubble column becomes the main flow of cleaning fluid with the highest purity. The sampling tube on the side wall of the straight cylinder is used to sample and test the oily cleaning fluid in this area in real time, ensuring that the sampled cleaning fluid has the most representative purity and effectively avoiding the interference of metal impurities and bubble disturbance on the test results. 2. Since the temperature of the cleaning fluid entering the separator is still relatively high, and the first temperature control unit is directly placed in the high-temperature cleaning fluid, it can sense the temperature of the cleaning fluid in real time. The phase change temperature of the first temperature control unit is set to the ideal working temperature threshold range of the cleaning fluid, so that under normal conditions, the first temperature control unit can be heated and deformed. After the first temperature control unit contracts, it will pull the first sealing block upward, causing the first sealing block to move upward as well, thereby opening one end of the sampling tube outlet, allowing the cleaning fluid to flow smoothly into the detection straight tube through the sampling tube. When the cleaning fluid flows through the mixing section, due to the existence of the mixing throat with the smallest inner diameter, the cleaning fluid flows through the mixing section... The sudden increase in flow rate in the throat causes a significant decrease in pressure at the mixing throat, creating a negative pressure zone. This negative pressure allows the external mixing tube to draw in a cooler cleaning solution from the outside into the mixing section. The cooler cleaning solution then mixes thoroughly with the originally hot cleaning solution, effectively cooling it down. The cooled cleaning solution then enters the detection section for accurate oil content detection. This significantly reduces the impact of temperature fluctuations on detection accuracy and effectively prevents thermal damage to optical detection components or lenses from the hot cleaning solution, thereby extending the service life of the detection equipment. 3. When the temperature of the cleaning fluid entering the mixing section rises to the phase change temperature of the second temperature control, the second temperature control shrinks and deforms due to heat. The shrinking second temperature control pulls down the second sealing block, so that the second sealing block seals the mixing inlet of the mixing section. At this time, the high-temperature cleaning fluid in the sampling section cannot enter the detection section through the mixing section, and the detection operation is automatically suspended, thereby preventing the cleaning fluid with a temperature exceeding the preset value from entering the detection section and damaging the detection module. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram illustrating the installation position of the separator according to an embodiment of this application; Figure 2 This is a structural schematic diagram illustrating the appearance of the separator according to an embodiment of this application; Figure 3 This is a schematic diagram illustrating the detection of a straight tube according to an embodiment of this application; Figure 4 This is a cross-sectional schematic diagram illustrating the internal structure of the separator according to an embodiment of this application; Figure 5 yes Figure 4 An enlarged view at point A; Figure 6 yes Figure 4 Enlarged diagram at point B.

[0016] Explanation of reference numerals in the attached diagram: 1. Separator; 11. Straight section; 111. Exhaust valve; 112. Exhaust pipe; 12. Conical section; 13. Inlet pipe; 14. Outlet pipe; 2. Detection module; 3. Cleaning machine; 4. Inspection straight tube; 41. Sampling tube; 42. Mixing inlet; 43. Mixing throat; 44. Mixing outlet; 45. External mixing tube; 5. Temperature control assembly; 51. First temperature control element; 52. First sealing block; 521. First reset element; 53. Second temperature control element; 54. Second sealing block; 541. Second reset element; 542. Connecting ring; 543. Connecting sleeve; 55. Rectifier plate; 551. Linkage pull rope; 56. Linkage rod. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0018] This application discloses an online oil content detection device for hydrocarbon cleaning fluid used in cleaning machines, see below. Figure 1and Figure 2 The online oil content detection device for hydrocarbon cleaning fluid in a cleaning machine includes a separator 1 and a detection module 2. The separator 1 can be installed on the cleaning fluid circulation pipeline of the cleaning machine 3, extracting a portion of the cleaning fluid from the circulating fluid in real time. The detection module 2 then performs online oil content detection. Alternatively, the separator 1 can be directly installed on the outer casing of the cleaning machine 3, with a dedicated pump directly extracting cleaning fluid from the cleaning fluid recovery tank for testing, ensuring representative sampling. The detection module 2 is located at the bottom of the separator 1 and preferably employs a high-precision optical sensor, such as a high-precision oil-in-water sensor. The sensor's detection principle is based on the absorption characteristics of oil substances to specific wavelengths of light, accurately calculating the oil concentration by measuring the change in the ratio of emitted to received light intensity. The core optical components within the detection module 2 undergo special coating treatment to improve resistance to hydrocarbon solvent corrosion.

[0019] For example, refer to Figure 2 and Figure 3 The separator 1 is vertically placed and hollow inside. From top to bottom, the separator 1 consists of a straight cylindrical section 11 and a tapered section 12 with a gradually decreasing inner diameter. The maximum inner diameters of the straight cylindrical section 11 and the tapered section 12 are equal and smoothly transition. In the vertical direction, the length of the straight cylindrical section 11 is less than the length of the tapered section 12. Near the top outer wall of the straight cylindrical section 11, an inlet pipe 13 is connected along its own tangential direction. The inlet pipe 13 is placed horizontally. At the inner wall of the straight cylindrical section 11 corresponding to the connection point, a guide slope is provided. The guide slope forms a 30° angle with the axis of the inlet pipe 13 and is inclined downwards, which can guide the cleaning fluid to enter the separator 1 at high speed along the tangential direction and then flow downwards in a spiral to form a stable vortex.

[0020] In some embodiments, the guide slope is formed by a partial inward protrusion of the inner wall of the straight section 11 or by wall thickness cutting. The starting end of the guide slope smoothly connects to the lower edge of the inner wall of the inlet pipe 13, and the end of the guide slope extends circumferentially along the straight section 11 to cover a range of 90° to 180°. The radial protrusion height of the guide slope relative to the inner wall of the straight section 11 is 1 / 10 to 1 / 5 of the inner diameter of the inlet pipe 13. The guide slope may also have a tangential guiding surface and an axial inclined surface. The angle between the tangential guiding surface and the axis of the inlet pipe 13 is preferably 30° ± 5°, which is used to efficiently convert the tangential momentum of the cleaning fluid into circumferential rotational momentum. The axial inclined surface is inclined downward at 10° to 20° relative to the horizontal surface, which is used to guide the cleaning fluid to spiral downward while rotating. In addition, the surface roughness Ra of the guide slope is not greater than 1.6 μm to reduce flow resistance. The flow rate of the cleaning fluid in the inlet pipe 13 should be no less than 2 m / s to ensure that a stable vortex with a centrifugal acceleration of no less than 5 g is formed in the straight section 11.

[0021] After the cleaning fluid forming a vortex enters the conical section 12, it rotates faster due to the gradually decreasing cross-sectional area of ​​the conical section 12, thereby increasing the centrifugal force. In other embodiments of this application, in order to extend the flow path of the cleaning fluid in the separator 1 and thus further improve the separation effect, a spiral guide groove can be fixed on the inner wall of the conical section 12 to guide the cleaning fluid to continuously flow downward along the spiral path. At the same time, the axial length of the conical section 12 can also be appropriately extended to allow impurities and bubbles in the cleaning fluid more time to be separated under the action of centrifugal force.

[0022] Understandably, since the cleaning fluid also contains metal residues and tiny bubbles, with the metal residues having a higher density than the cleaning fluid and the bubbles having a lower density than the cleaning fluid, the strong centrifugal force after the cleaning fluid forms a vortex causes the densest metal residues to rotate at high speed, adhering closely to the inner wall of the conical section 12, gradually forming a spiral settling zone adhering closely to the inner wall of the conical section 12. Meanwhile, the least dense bubbles are pushed towards the center of the vortex by the radial centrifugal force and gather upward to form gas nuclei. This achieves effective separation between the metal residues, the cleaning fluid, and the bubbles, which is beneficial for the subsequent accurate detection of the oil content in the cleaning fluid.

[0023] In some embodiments, a liquid outlet pipe 14 is connected to the bottom side wall of the conical section 12. The liquid outlet pipe 14 is connected to the internal cavity of the conical section 12, which can export excess cleaning liquid that has not been tested in the separator 1 back to the circulation system to avoid resource waste. At the same time, in order to control the discharge volume of cleaning liquid, a solenoid valve can be fixed on the liquid outlet pipe 14. The opening of the solenoid valve is dynamically adjusted by an external main control unit, so that the cleaning liquid to be tested in the separator 1 always maintains a constant liquid level and a stable flow rate. In addition, in order to discharge the gas nucleus concentrated in the center of the top of the straight section 11 in a timely manner, an exhaust valve 111 and an exhaust pipe 112 are connected to the center of the top of the straight section 11. When the volume of the gas nucleus reaches a preset threshold, the exhaust valve 111 automatically opens and the air bubbles are discharged through the exhaust pipe 112, ensuring that the separated air bubbles are discharged in a timely manner.

[0024] For example, refer to Figures 3 to 6 To accurately extract the cleaning fluid to be tested from the separator 1, a detection straight tube 4 is provided inside the separator 1. The detection straight tube 4 is vertical and coaxially fixed inside the separator 1. The outer diameter of the detection straight tube 4 is smaller than the inner diameter of the conical section 12, and the top end of the detection straight tube 4 is located in the middle region of the separator 1. In this embodiment, the top end of the detection straight tube 4 is located in the middle position of the conical section 12. After the cleaning fluid has passed through the spiral flow of the straight section 11 and the conical section 12, it has been separated. At this time, the liquid in the detection straight tube 4 is highly pure, containing only the cleaning fluid to be tested, without bubble interference or metal residue mixing in. Therefore, this section is selected as the sampling area to ensure that the test results truly reflect the essential characteristics of the oil content of the cleaning fluid, and to reduce the influence on the spiral travel path of the eddy cleaning fluid.

[0025] Furthermore, a sampling tube 41 is fixed to and connected to the top side wall of the detection straight tube 4. Multiple sampling tubes 41 are arranged circumferentially around the detection straight tube 4, with the length of each sampling tube 41 not exceeding the diameter of the detection straight tube 4. The outer diameter of each sampling tube 41 is 1 / 4 to 1 / 5 of the outer diameter of the detection straight tube 4, ensuring minimal sampling disturbance. The inlet port of each sampling tube 41 is located on its side wall, allowing for better guidance of the cleaning fluid into the tube. The end of each sampling tube 41 furthest from the detection straight tube 4 is higher than the end closest to it, resulting in an upward-sloping posture. The inlet end of each sampling tube 41 is located below the inlet pipe 13, allowing the cleaning fluid to naturally flow into the sampling tube 41 by means of the liquid level difference and gravity.

[0026] In some embodiments, to regulate the sampling process based on the temperature of the cleaning fluid, a temperature control component 5 is installed inside the detection straight tube 4. This component senses the temperature of the cleaning fluid inside the separator 1 in real time, thereby controlling the opening and closing of the internal channels of the detection straight tube 4. Specifically, the temperature control component 5 includes a first temperature control element 51 and a first sealing block 52. The first sealing block 52 slides vertically inside the detection straight tube 4 and is sealed to the inner wall of the detection straight tube 4 by a sealing rubber ring, preventing the cleaning fluid from seeping into the detection straight tube 4 from between the first sealing block 52 and the inner wall of the detection straight tube 4. The first temperature control element 51 is located above the first sealing block 52. The first temperature control element 51 is preferably made of a nickel-titanium alloy shape memory alloy component. The phase transition temperature of the first temperature control element 51 matches the ideal operating temperature threshold range of the cleaning fluid, i.e., within the range of 60-80℃. The phase transition temperature threshold of the first temperature control element 51 can be precisely controlled by finely adjusting the atomic ratio of nickel and titanium.

[0027] The first temperature control unit 51 is configured to retract itself when a preset phase change temperature is reached. The top of the first temperature control unit 51 is fixed to the inner wall of the detection straight tube 4 by a fixing rod. In this embodiment, to fix the first temperature control unit 51, a fixing ring with a through hole is fixed to the top of the detection straight tube 4. The top of the first temperature control unit 51 is fixed to the bottom of the fixing ring, and the liquid in the separator 1 can contact the first temperature control unit 51 through the through hole. At the same time, the bottom of the first temperature control unit 51 is fixed to the top of the first sealing block 52, so that the first sealing block 52 can rise when the first temperature control unit 51 retracts. In order to enable the first sealing block 52 to return to its initial position when not in use, a first reset member 521 is provided at the bottom of the first sealing block 52. The first reset member 521 is preferably a tension spring. One end of the first reset member 521 is fixed to the bottom of the first sealing block 52, and the other end is fixed to the inner wall of the detection straight tube 4. The tension of the first reset member 521 is configured to be less than the deformation force when the first temperature control unit 51 retracts.

[0028] Understandably, since the temperature of the cleaning fluid entering the separator 1 is still relatively high, and the first temperature control unit 51 is directly placed in the high-temperature cleaning fluid, it can sense the temperature of the cleaning fluid in real time. In the initial state, the first sealing block 52 seals the outlet end of the sampling tube 41, preventing the cleaning fluid from flowing into the sampling tube 41. When the cleaning fluid enters the separator 1, under normal temperature conditions, the first temperature control unit 51 can be heated and deformed. After the first temperature control unit 51 contracts, it will pull the first sealing block 52 upward, causing the first sealing block 52 to move upward as well, thereby opening the outlet end of the sampling tube 41, allowing the cleaning fluid to flow smoothly into the detection straight tube 4 through the sampling tube 41 for subsequent detection. When all the cleaning fluid in the separator 1 is discharged through the outlet tube 14, the first temperature control unit 51 cools down and gradually returns to its initial state. At this time, the tension generated by the first reset member 521 due to stretching will return the first sealing block 52 to its initial position, and the first sealing block 52 will reseal the sampling tube 41.

[0029] For example, the detection straight tube 4 has, from top to bottom, interconnected mixing inlet 42, mixing throat 43, and mixing outlet 44 arranged in the internal cavity below the sampling tube 41. The inner diameter of the mixing throat 43 is smaller than the inner diameters of the mixing inlet 42 and the mixing outlet 44, so that the mixing inlet 42, mixing throat 43, and mixing outlet 44 together form a Venturi structure. When the cleaning fluid flows from the mixing inlet 42 through the mixing throat 43, the flow rate of the cleaning fluid increases sharply due to the contraction of the inner diameter, and the pressure at the mixing throat 43 drops sharply. An external mixing tube 45 is fixed to the outer wall of the detection straight tube 4 corresponding to the mixing throat 43. The inner diameter of the external mixing tube 45 is smaller than the inner diameter of the mixing throat 43. One end of the external mixing tube 45 is connected to the mixing throat 43 in the detection straight tube 4, and the other end can be connected to a container containing low-temperature or room-temperature cleaning fluid. To reduce the temperature interference caused by the cleaning fluid in separator 1 to the cleaning fluid flowing in from the external mixing pipe, the external mixing pipe 45 is directly installed on the detection straight pipe 4 outside the separator 1. The bottom of the detection straight pipe 4 extends directly downward through the separator 1 housing, and the detection module 2 is fixed at the part of the detection straight pipe 4 that extends out of the separator 1 housing.

[0030] Understandably, when the cleaning fluid flows through the mixing section, due to the presence of the mixing throat 43 with the smallest inner diameter, the flow velocity of the cleaning fluid increases sharply when it enters the mixing throat 43 from the mixing inlet 42, causing a significant decrease in pressure at the mixing throat 43. This creates a negative pressure zone at the mixing throat 43. The negative pressure can draw the externally cooler cleaning fluid into the detection straight tube 4 through the external mixing pipe 45. At this time, the cooler cleaning fluid mixes thoroughly with the originally high-temperature cleaning fluid in the mixing section, effectively cooling the originally high-temperature cleaning fluid. The cooled cleaning fluid can significantly reduce the impact of temperature fluctuations on detection accuracy, and can also effectively avoid thermal damage to optical detection elements or lenses by the high-temperature cleaning fluid, thereby extending the service life of the detection equipment. Furthermore, the externally cool or room-temperature cleaning fluid drawn into the detection straight tube 4 has a certain kinetic energy and can actively mix thoroughly with the sampled high-temperature cleaning fluid without the need for additional stirring components.

[0031] In some embodiments, the temperature control component 5 further includes a second temperature control element 53 and a second sealing block 54. The second sealing block 54 is vertically slidably connected inside the detection straight tube 4 and is located at the mixing inlet 42 of the detection straight tube 4. In the initial state, the second sealing block 54 opens the mixing inlet 42, at which time the cleaning fluid can smoothly enter the mixing throat 43. A second reset element 541 and a connecting ring 542 are also provided in the detection straight tube 4 at the position corresponding to the second temperature control element 53. The connecting ring 542 and the second sealing block 54 are fixedly connected as one unit by the connecting sleeve 543. The second reset element 541 can preferably be a tension spring. One end of the second reset element 541 is fixed to the inner wall of the detection straight tube 4, and the other end is fixed to the top of the connecting ring 542. The second reset element 541 can pull the second sealing block 54 upward in the initial state of the second temperature control element 53 being extended, thereby keeping the mixing inlet 42 in the open state. The outer diameter of the second sealing block 54 is smaller than the inner diameter of the detection straight tube 4, so that an annular channel is formed between the second sealing block 54 and the detection straight tube 4, which allows the cleaning fluid to flow.

[0032] Furthermore, the second temperature control 53 is placed inside the detection straight tube 4 below the second sealing block 54. Specifically, the second temperature control 53 is located in the mixing outlet 44 region of the detection straight tube 4. Similarly, the second temperature control 53 is preferably made of a shape memory alloy component made of nickel-titanium alloy. However, unlike the first temperature control 51, the phase change temperature of the second temperature control 53 is set to be lower than the normal operating temperature of the cleaning fluid. In this embodiment, the phase change temperature of the second temperature control 53 is set in the range of 40-50°C. If the temperature of the mixed cleaning fluid is lower than this range, the second temperature control 53 maintains its initial elongated state. The top end of the second temperature control 53 is fixedly connected to the connecting ring 542, and the bottom end is fixedly connected to the inner wall of the detection straight tube 4. When the temperature of the mixed cleaning fluid rises to its own phase change temperature range, the second temperature control 53 contracts due to heat and pulls the second sealing block 54 down through the connecting ring 542, ultimately actively sealing the mixing inlet 42. In addition, the second temperature control 53 can preferably be made of a shape memory alloy material with thermal hysteresis characteristics, thereby appropriately increasing the phase change temperature range of the second temperature control 53, avoiding frequent opening and closing of the second sealing block 54 due to small temperature fluctuations, improving the system response stability. When the cleaning fluid temperature completely drops back to the lower limit of the phase change range, the second temperature control 53 slowly recovers its elongated state, thereby driving the second sealing block 54 to reset.

[0033] Understandably, when the temperature of the mixed cleaning fluid still rises to the phase change temperature of the second temperature control 53, it indicates that the detection temperature of the cleaning fluid is abnormal. At this time, the second temperature control 53 shrinks and deforms due to heat, pulling down the second sealing block 54, so that the second sealing block 54 seals the mixing inlet 42. At this time, the high-temperature cleaning fluid that has entered the detection straight pipe 4 cannot flow to the detection device for detection, realizing automatic suspension of detection operation, thereby preventing the cleaning fluid with a temperature exceeding the preset value from entering the detection section and damaging the detection module 2.

[0034] In some embodiments, to enhance the mixing effect of the hot and cold cleaning fluids in the mixing section of the detection straight pipe 4, an active mixing component (not shown) can be added at the mixing outlet 44 of the mixing section. For example, a spiral porous guide plate can be preferably provided, which can forcibly change the flow path of the cleaning fluid in the detection straight pipe 4, thereby promoting heat exchange between the high and low temperature cleaning fluids. This ensures that the cleaning fluid used for subsequent oil content detection can maintain a uniform and stable temperature. At the same time, it can further extend the mixing path of the cleaning fluid in the detection straight pipe 4, effectively eliminating the temperature stratification phenomenon of the cleaning fluid after mixing. Of course, the length of the mixing section of the detection straight pipe 4 can also be appropriately extended as needed to provide sufficient installation space for the internal mixing components.

[0035] In some embodiments, a rectifier 55 is further provided between the second temperature control unit 53 and the detection module 2. The rectifier 55 is used to rectify the flow field of the mixed cleaning fluid, eliminate eddies and turbulence disturbances, and ensure that the cleaning fluid flows through the optical detection area in a more stable state. The rectifier 55 has a V-shaped structure symmetrical along the axis of the detection straight tube 4. Multiple rectifiers 55 are provided and distributed at intervals along the axis of the detection straight tube 4. Each rectifier 55 includes two symmetrical and hinged blades. The two blades belonging to the same rectifier 55 are connected by an elastic hinge. Both sides of the blades are inserted and slidably connected to the inner wall of the detection straight tube 4 by sliding rods. All rectifiers 55 are connected in series by a flexible linkage rope 551. When the linkage rope 551 is pulled, all rectifiers 55 rotate synchronously around their corresponding elastic hinges, which increases or decreases the angle between the two blades. This causes the rectifier section of the detection straight pipe 4 corresponding to the rectifier 55 to contract or expand, thereby dynamically adjusting the flow rate and pressure distribution of the cleaning fluid.

[0036] Furthermore, a linkage rod 56 is coaxially arranged inside the detection straight tube 4. The top of the linkage rod 56 passes upward through the second sealing block 54 and is fixed to the bottom of the first sealing block 52. The bottom end of the linkage rod 56 passes downward coaxially through and slides between the second sealing block 54 and the connecting sleeve 543. After passing through the connecting ring 542, it is fixed to one end of the linkage pull rope 551. When the first sealing block 52 slides upward, the linkage rod 56 pulls all the rectifier vanes 55 to rotate. At this time, the vanes corresponding to all the rectifier vanes 55 contract and the included angle decreases, thereby opening the inner cavity corresponding to the detection straight tube 4. The mixed cleaning fluid can then flow through the rectifier vanes 55 for rectification.

[0037] The implementation principle of the online oil content detection device for hydrocarbon cleaning fluid in a cleaning machine according to an embodiment of this application is as follows: The separator 1 performs vortex separation on the incoming high-temperature cleaning fluid, using centrifugal force to separate the internal metal residues and bubbles from the main body of the cleaning fluid. Then, the sampling tube 41 can accurately extract the separated clean cleaning fluid for detection. The first temperature control 51 contracts when heated, thereby opening the first sealing block 52. At the same time, the wing plate corresponding to the rectifier 55 can be opened. The clean cleaning fluid flows into the detection straight tube 4 through the sampling tube 41, and then flows through the mixing throat 43. When flowing through the mixing throat 43, the venturi effect generates negative pressure. The external low-temperature cleaning fluid is drawn in through the external mixing tube 45 and fully mixed with the high-temperature cleaning fluid, so that the temperature of the cleaning fluid drops rapidly to below the preset safety threshold, avoiding damage to optical instruments such as optical lenses or interference with the detection results caused by high temperature. After the mixed cleaning fluid is stabilized by the rectifier 55, it enters the optical detection area for detection.

[0038] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0039] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0040] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. An online oil content detection device for hydrocarbon cleaning fluid used in cleaning machines, characterized in that: include The separator (1) is hollow inside. The separator (1) consists of a straight section (11) and a tapered section (12) with a gradually decreasing inner diameter from top to bottom. The top outer wall of the straight section (11) is connected to the liquid inlet pipe (13) along its own tangential direction. The side wall of the tapered section (12) is connected to the liquid outlet pipe (14). The tapered section (12) is used to separate metal residues and bubbles in the cleaning liquid to be tested. The detection straight tube (4) is coaxially placed inside the separator (1). The top of the detection straight tube (4) is located in the middle area of ​​the separator (1) and is used to sample the oily cleaning liquid after separation. The bottom of the detection straight tube (4) extends out of the bottom of the separator (1) and is equipped with a detection module (2) for detecting the sampled cleaning liquid by optical means. Temperature control component (5) is installed inside detection straight tube (4) to sense the temperature of cleaning fluid in separator (1) in real time, so as to control the opening and closing of the internal channel of detection straight tube (4).

2. The online oil content detection device for hydrocarbon cleaning fluid in a cleaning machine according to claim 1, characterized in that: The detection straight tube (4) includes a sampling section, a mixing section and a detection section from top to bottom. The sampling section is used to sample the separated oily cleaning liquid. The mixing section is used to introduce external cleaning liquid to mix and cool the sampled cleaning liquid. The detection module (2) is located in the detection section.

3. The online oil content detection device for hydrocarbon cleaning fluid in a cleaning machine according to claim 2, characterized in that: The top sidewall of the sampling section is provided with a sampling tube (41). There are multiple sampling tubes (41) and they are distributed circumferentially around the detection straight tube (4). The height of the end of each sampling tube (41) away from the detection straight tube (4) is higher than the end near the detection straight tube (4). The inlet end of the sampling tube (41) is located below the liquid inlet tube (13).

4. The online oil content detection device for hydrocarbon cleaning fluid in a cleaning machine according to claim 2, characterized in that: The temperature control component (5) includes a first temperature control element (51) and a first sealing block (52). The first sealing block (52) slides vertically and is sealed to the inner wall of the sampling section. During the vertical sliding process, the first sealing block (52) can open and close one end of the outlet of all the sampling tubes (41). The top end of the first temperature control element (51) is connected to the inner wall of the sampling section, and the bottom end is connected to the top of the first sealing block (52). The first temperature control element (51) is used to be placed in the cleaning fluid and sense the temperature of the cleaning fluid in real time. The first temperature control element (51) is configured to contract after being heated and drive the first sealing block (52) to open the sampling tube (41).

5. The online oil content detection device for hydrocarbon cleaning fluid in a cleaning machine according to claim 4, characterized in that: The mixing section includes, from top to bottom, a mixing inlet (42), a mixing throat (43), and a mixing outlet (44) that are interconnected. The inner diameter of the mixing throat (43) is smaller than the inner diameter of the mixing inlet (42) and the mixing outlet (44). The mixing section also includes an external mixing pipe (45). One end of the external mixing pipe (45) is connected to the mixing throat (43), and the other end is used to connect to a low-temperature or room-temperature cleaning fluid.

6. The online oil content detection device for hydrocarbon cleaning fluid in a cleaning machine according to claim 5, characterized in that: The temperature control component (5) includes a second temperature control element (53) and a second sealing block (54). The second sealing block (54) is vertically slidably connected inside the detection straight tube (4). The second temperature control element (53) is placed in the inner cavity of the mixing section below the second sealing block (54). The top end of the second temperature control element (53) is connected to the second sealing block (54), and the bottom end is connected to the inner wall of the mixing section. The second temperature control element (53) is configured to shrink when heated and drive the second sealing block (54) to seal the mixing inlet (42) of the mixing section to block the cleaning fluid from entering the mixing section.

7. The online oil content detection device for hydrocarbon cleaning fluid in a cleaning machine according to claim 6, characterized in that: Both the first temperature control (51) and the second temperature control (53) are made of shape memory alloy so that the first temperature control (51) and the second temperature control (53) can shrink themselves after being heated. The phase change temperature of the second temperature control (53) is lower than that of the first temperature control (51).

8. The online oil content detection device for hydrocarbon cleaning fluid in a cleaning machine according to claim 6, characterized in that: A rectifier section is also provided between the mixing section and the detection section. The rectifier section connects the mixing section and the detection section. A rectifier plate (55) is hinged in the rectifier section. A linkage rod (56) is coaxially provided in the detection straight tube (4). The linkage rod (56) passes through the detection section and the mixing section. The top of the linkage rod (56) is connected to the bottom of the first sealing block (52). The bottom of the linkage rod (56) is coaxially inserted downward and slidably connected to the second sealing block (54). The bottom of the linkage rod (56) is connected to the rectifier plate (55) through a linkage pull rope (551). When the first sealing block (52) slides upward, the linkage rod (56) pulls the rectifier plate (55) to rotate to conduct the rectifier section so as to rectify the mixed cleaning liquid.

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