Automobile engine oil ntc temperature sensor detection device and method

Abstract

The application discloses a kind of automobile machine oil NTC temperature sensor detection device and method, it is related to machine oil detection technical field, machine oil in the process of long-term use its inside will be doped with part impurity, because internal doped impurity is more, the specific heat capacity of each substance is also not same, leading to internal temperature difference, there will be some deviation when temperature detection, this will lead to the abnormality of output resistance value, the present application in the process of machine oil detection, by machine oil in internal circulation, extract part machine oil for detection in the process of circulation, take machine oil detection can avoid the influence of local heat level of machine oil, in addition, by screening to its internal impurity, after screening, detection can avoid the influence of impurity on detection result, finally after removing impurity, the capacity of machine oil in will change, in order to make machine oil still can maintain relatively constant capacity, it is replenished, ensure that machine oil liquid level reaches ideal state.

Description

Technical Field

[0001] This invention relates to the field of engine oil testing technology, specifically to an automotive engine oil NTC temperature sensor testing device and method. Background Technology

[0002] An engine oil temperature sensor is one of the most important sensors used to monitor engine oil temperature. An NTC (Non-Temperature Coefficient) is a common type of thermistor whose resistance changes with temperature. This sensor helps the engine management system monitor and control the engine's operating temperature by measuring the oil temperature, ensuring optimal performance and combustion efficiency.

[0003] In modern engine oil temperature testing, engine oil will contain some impurities during long-term use. For example, the viscosity of some engine oils that have been used for a long time will be relatively high. When passing the temperature test, due to the large number of impurities and the different specific heat capacities of the various substances, there will be differences in the internal temperature, which will cause some deviations in the temperature test. This will lead to abnormal output resistance values.

[0004] To address the aforementioned issues, a device and method for detecting automotive engine oil NTC temperature sensor are proposed. Summary of the Invention

[0005] The purpose of this invention is to provide an automotive engine oil NTC temperature sensor detection device and method, which solves the problem of deviation in engine oil temperature detection in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an automotive engine oil NTC temperature sensor detection device, comprising a circulation pipe, a detection chamber connected to the top surface of the circulation pipe, and a fixing frame fixedly connected to one side of the front of the detection chamber;

[0007] An extraction assembly is provided on both the left and right sides of the detection chamber. The extraction assembly includes an inlet pipe that is embedded inside the detection chamber. An inlet chamber is fixedly connected to the top of the inner wall of the right side of the circulation pipe. An inlet is provided on the inlet chamber and is connected to the inlet pipe. A heat-conducting plate is fixedly connected to the back side of the detection chamber. A cooling fan is fixedly connected to the surface of the heat-conducting plate. A detection probe is embedded in the top of the detection chamber. An outlet is provided on the inner wall of the circulation pipe on the side away from the inlet chamber.

[0008] The detection chamber is internally embedded with a capacity detection component, which includes a liquid volume detector. The liquid volume detector is embedded on the left side of the detection chamber and a liquid volume detector is embedded on the right side. A data processor is connected between the liquid volume detector and the liquid volume detector. A replenishment chamber is connected to the top surface of the detection chamber. A storage chamber is connected to the top of the replenishment chamber. A supply pipe is embedded between the replenishment chamber and the storage chamber. A delivery pipe is also embedded inside the replenishment chamber and extends into the circulation pipe. Two sets of partitions are embedded inside the replenishment chamber. A metering wheel is embedded between the two sets of partitions. A wrapping sheet is fixedly connected to the inner wall of the replenishment chamber. The wrapping sheet is included on the outer surface of the metering wheel.

[0009] Both liquid volume detector one and liquid volume detector two are equipped with a metering wheel, a separator, and a wrapping sheet inside.

[0010] Preferably, the right side of the circulation pipe is the inlet and the left side is the outlet. The liquid inlet chamber is suspended at the top of the inner wall of the circulation pipe, and the width of the liquid inlet chamber is half the inner width of the circulation pipe.

[0011] Preferably, the inlet is inclined upward and opened on the inner wall of the circulation pipe and connected to the inlet pipe. The oil introduced into the detection chamber through the inlet pipe first passes through the liquid level detection device 2 and then through the liquid level detection device 1, and is discharged into the circulation pipe from another set of inlet pipes.

[0012] Preferably, the detection chamber is equipped with a filter assembly, which includes a support frame. The top of the support frame is located on both sides of the inner wall of the detection chamber, and the support frame is positioned between the detection probe and the liquid volume detector.

[0013] Preferably, a filter belt is provided on the outer surface of the support frame, and soft scrapers are also uniformly provided on the outer surface of the filter belt.

[0014] Preferably, a sludge collection bin is also provided on one side of the support frame, the side wall of the sludge collection bin abuts against the scraper, and the top surface of the sludge collection bin is inclined.

[0015] Preferably, the package is divided into a connecting part and an arc-shaped part. The connecting part is fixedly connected to the inner wall of the supply compartment, and the arc-shaped part is wrapped around the metering wheel.

[0016] Preferably, the connecting part on the package sheet is obliquely fixed to the inner wall of the supply compartment, and the upper and lower inner walls of the supply compartment are provided with package sheets, and the two sets of connecting parts are combined to form a trumpet-shaped opening.

[0017] Preferably, the metering wheel and the filter assembly are rotatably connected, and the surface of the metering wheel is provided with three sets of inwardly recessed arc-shaped grooves. The number of rotations of the metering wheel is transmitted to the inside of the data processor.

[0018] An application method of an automotive engine oil NTC temperature sensor detection device:

[0019] Extraction: The engine oil circulates inside the circulation pipe, and some of the engine oil is poured into the liquid inlet chamber, and then transported to the testing chamber through the liquid inlet and liquid inlet pipe.

[0020] In one measurement, the engine oil enters the interior of the detection chamber. When it passes through the second liquid level detector, it drives the measuring wheel inside the second liquid level detector to rotate. The rotation of the measuring wheel uploads the number of rotations to the internal data processor.

[0021] Filtration: The oil that has passed through the liquid level detector passes through the filter belt. Impurities cannot pass through the filter holes on the filter belt. The motor on the support frame drives the filter belt to rotate. The impurities adhere to the surface of the filter belt. The impurities are supported by the scraper. Then the impurities are poured into the inside of the sludge collection bin for collection. The impurities are mixed with oil.

[0022] Temperature detection: The oil passing through the filter belt is tested by a detection probe to measure the temperature, and the measured value is displayed as a resistance value and uploaded to the computer terminal.

[0023] Secondary metering: After temperature detection, the engine oil flows into the inlet pipe through the liquid level sensor and eventually returns to the circulation pipe. The oil level sensor drives the internal metering wheel to rotate, and the number of rotations is uploaded to the data processor.

[0024] During replenishment, when the number of rotations of the metering wheel inside liquid level detector 1 is less than the number of rotations of the metering wheel inside liquid level detector 2, the data processor calculates the difference. The difference is sent to the metering wheel inside the replenishment chamber, causing the metering wheel to rotate. The number of rotations equals the number of rotations of the difference. The oil inside the storage chamber enters the interior of the supply pipe and is finally transported to the interior of the circulation pipe through the delivery pipe.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. The present invention provides an NTC temperature sensor detection device and method for automotive engine oil. In the process of engine oil detection, the engine oil circulates internally, and a portion of the engine oil is extracted for detection during the circulation process. This method avoids the influence of local heat fluctuations in the engine oil. In addition, by screening internal impurities before detection, the impurities can be prevented from affecting the detection results. Finally, after the impurities are removed, the volume of the engine oil will change. In order to maintain a relatively constant volume of engine oil, it is replenished to ensure that the engine oil level reaches the ideal state. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the liquid inlet chamber and liquid inlet of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of the supply bin and storage bin of the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of liquid volume detection device 2 and liquid volume detection device 1 of the present invention;

[0031] Figure 5 This is a schematic diagram of the liquid inlet chamber and detection probe of the present invention;

[0032] Figure 6 This is a schematic diagram of the metering wheel and conveying pipe of the present invention;

[0033] Figure 7 This is a schematic diagram of the structure of the wrapping sheet and the separator sheet of the present invention;

[0034] Figure 8 This is a schematic diagram of the support frame and scraper of the present invention;

[0035] Figure 9 This is a schematic diagram of the liquid volume detection device and data processor of the present invention.

[0036] In the diagram: 11. Circulation pipe; 12. Detection chamber; 13. Fixing frame; 2. Extraction assembly; 21. Inlet pipe; 22. Inlet chamber; 23. Inlet port; 24. Heat-conducting plate; 25. Cooling fan; 26. Detection probe; 27. Outlet port; 3. Volume detection assembly; 31. Volume detection one; 32. Volume detection two; 33. Data processor; 34. Replenishment chamber; 35. Storage chamber; 36. Delivery pipe; 37. Supply pipe; 38. Metering wheel; 4. Filter assembly; 41. Support frame; 42. Filter belt; 43. Dirt collection chamber; 44. Drain pipe; 45. Scraper; 5. Wrapping sheet; 6. Separator. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings.

[0039] Combination Figures 1-9The present invention provides an automotive engine oil NTC temperature sensor detection device, comprising a circulation pipe 11, a detection chamber 12 connected to the top surface of the circulation pipe 11, and a fixing frame 13 fixedly connected to one side of the front of the detection chamber 12.

[0040] Extraction components 2 are provided on both the left and right sides of the detection chamber 12. Each extraction component 2 includes an inlet pipe 21, which is embedded inside the detection chamber 12. An inlet chamber 22 is fixedly connected to the top of the inner wall of the right side of the circulation pipe 11. The right side of the circulation pipe 11 is the inlet, and the left side is the outlet. The inlet chamber 22 is suspended from the top of the inner wall of the circulation pipe 11. The width of the inlet chamber 22 is half the internal width of the circulation pipe 11. An inlet port 23 is provided on the inlet chamber 22, and the inlet port 23 is inclined upwards inside the circulation pipe 11. The oil is connected to the inlet pipe 21 and is introduced into the detection chamber 12 through the inlet pipe 21. The oil first passes through the liquid level detector 22 and then through the liquid level detector 11, and is discharged into the circulation pipe 11 through another set of inlet pipes 21. The inlet port 23 is connected to the inlet pipe 21. A heat conduction plate 24 is fixedly connected to one side of the back of the detection chamber 12. A cooling fan 25 is fixedly connected to the surface of the heat conduction plate 24. A detection probe 26 is embedded in the top of the detection chamber 12. An outlet port 27 is opened on the inner wall of the circulation pipe 11 on the side away from the inlet chamber 22.

[0041] When testing the temperature of automotive engine oil, the oil is first extracted. To prevent uneven internal temperature from causing deviations in the test results, the oil is extracted to obtain a portion for testing. This provides a better indication of the average current oil temperature. During extraction, the oil circulates within the circulation pipe 11. During this circulation, some oil enters the inlet chamber 22 and is then pumped into the inlet port 23. As the oil passes through the inlet port 23 and the first set of inlet pipes 21, it is delivered to the testing chamber 12. This completes the oil extraction. The extracted oil in the testing chamber 12 needs to be measured by the volume detector 32 to determine the amount extracted for subsequent operations. The specific operation is as follows:

[0042] The detection chamber 12 is internally embedded with a capacity detection component 3, which includes a liquid level detector 31. The liquid level detector 31 is embedded on the left side of the inner side of the detection chamber 12, and a liquid level detector 32 is embedded on the right side. A data processor 33 connects the liquid level detector 31 and the liquid level detector 32. A replenishment chamber 34 is connected to the top surface of the detection chamber 12, and a storage chamber 35 is connected to the top of the replenishment chamber 34. A supply pipe 37 is embedded between the replenishment chamber 34 and the storage chamber 35. The replenishment chamber 34 also contains... A conveying pipe 36 is embedded, extending into the interior of the circulation pipe 11. A separator 6 is embedded inside the supply chamber 34. Two sets of separators 6 are provided, and a metering wheel 38 is embedded between the two sets of separators 6. A wrapping sheet 5 is fixedly connected to the inner wall of the supply chamber 34. The wrapping sheet 5 is included on the outer surface of the metering wheel 38. The metering wheel 38 is rotatably connected to the filter assembly 4. The surface of the metering wheel 38 is provided with three sets of inwardly recessed arc grooves. The number of rotations of the metering wheel 38 is transmitted to the interior of the data processor 33.

[0043] Both liquid level detector 31 and liquid level detector 32 are equipped with a metering wheel 38, a separator 6, and a wrapping plate 5. The wrapping plate 5 is divided into a connecting part and an arc-shaped part. The connecting part is fixedly connected to the inner wall of the supply chamber 34, and the arc-shaped part wraps around the metering wheel 38. The connecting part on the wrapping plate 5 is inclinedly fixed to the inner wall of the supply chamber 34. Both the upper and lower inner walls of the supply chamber 34 are equipped with wrapping plates 5. The two sets of connecting parts combine to form a trumpet-shaped opening. When the liquid level detector 32 extracts the oil, the oil will drive the metering wheel 38 to rotate as it passes through the interior of the liquid level detector 32. The inwardly recessed arc-shaped groove on the metering wheel 38 has a consistent capacity. The metering wheel 38 also serves as a left and right separator for the liquid level detector 32. The oil is transported to the other side of the liquid level detector 32 as the metering wheel 38 rotates. The volume of oil extracted can be calculated based on the number of rotations, and this volume is uploaded and recorded.

[0044] After recording is completed, the extracted engine oil is processed, and the filtration process is as follows:

[0045] The detection chamber 12 is equipped with a filter assembly 4. The filter assembly 4 includes a support frame 41. The top of the support frame 41 is on both sides of the inner wall of the detection chamber 12. The support frame 41 is positioned between the detection probe 26 and the liquid volume detector 32. A filter belt 42 is provided on the outer surface of the support frame 41. Soft scraper strips 45 are also evenly distributed on the outer surface of the filter belt 42. A sludge collection chamber 43 is also provided on one side of the support frame 41. One side wall of the sludge collection chamber 43 abuts against the scraper strips 45. The top surface of the sludge collection chamber 43 is inclined.

[0046] Engine oil contains a large number of impurities, including metal shavings, dust, dried and clumped engine oil, and high-viscosity engine oil. These impurities can be removed by the filter on the filter belt 42. The impurities cannot pass through the filter holes on the filter belt 42, thus filtering out clean engine oil. The filtered impurities will adhere to the surface of the filter belt 42. When the filter belt 42 is rotated by the motor, the impurities are poured into the inside of the sludge collection bin 43 for collection. Then, they are discharged through the drain pipe 44. In order to better pick up the impurities, a scraper 45 is provided to facilitate the collection of impurities.

[0047] The engine oil after being filtered by filter belt 42 is tested by immersing the detection probe 26 in the engine oil to detect the temperature of the engine oil, and then the detected temperature is fed back to the computer terminal.

[0048] Finally, during the process of removing impurities from the engine oil, some oil will be consumed, reducing the overall oil volume. To prevent the oil level from dropping due to insufficient oil volume, the oil needs to be replenished to the appropriate level. The specific steps are as follows:

[0049] First, when the oil passes through the second fluid level detector 32 and drives the metering wheel 38 to rotate, the volume of oil entering the detection chamber 12 is calculated. Then, the volume of oil flowing out of the detection chamber 12 is calculated by the rotation of the metering wheel 38 inside the first fluid level detector 31. The difference between the two is the amount of oil lost, and the lost amount is replenished.

[0050] For example, if 3L of engine oil enters the detection chamber 12 and 2.5L of engine oil flows out of the detection chamber 12, a loss of 0.5L will occur. At this time, the engine oil in the storage chamber 35 will be transported to the replenishment chamber 34 through the supply pipe 37. The rotation of the metering wheel 38 in the replenishment chamber 34 will transport 0.5L of engine oil into the circulation pipe 11. Finally, it will be transported into the circulation pipe 11 through the delivery pipe 36, thus ensuring the original amount of engine oil is maintained.

[0051] An application method of an automotive engine oil NTC temperature sensor detection device:

[0052] Extraction: The engine oil circulates inside the circulation pipe 11, and some engine oil is poured into the liquid inlet chamber 22, and then transported to the detection chamber 12 through the liquid inlet 23 and the liquid inlet pipe 21.

[0053] In one measurement, the oil enters the interior of the detection chamber 12. When it passes through the liquid level detector 32, it drives the metering wheel 38 inside the liquid level detector 32 to rotate. The rotation of the metering wheel 38 uploads the number of rotations to the interior of the data processor 33.

[0054] Filtration: The oil passing through the liquid level detector 32 passes through the filter belt 42. Impurities cannot pass through the filter holes on the filter belt 42. The motor on the support frame 41 drives the filter belt 42 to rotate. Impurities adhere to the surface of the filter belt 42. The impurities are supported by the scraper 45. Then the impurities are poured into the inside of the sludge collection bin 43 for collection. The impurities are mixed with oil.

[0055] Temperature detection: The oil passing through the filter belt 42 is measured by the detection probe 26, and the measured value is displayed as a resistance value and uploaded to the computer terminal.

[0056] Secondary metering: After temperature detection, the oil flows into the inlet pipe 21 through the liquid level detector 31 and eventually returns to the circulation pipe 11. The oil level detector 31 drives the internal metering wheel 38 to rotate, and the number of rotations is uploaded to the data processor 33.

[0057] During replenishment, when the number of rotations of the metering wheel 38 inside the liquid level detector 31 is less than the number of rotations of the metering wheel 38 inside the liquid level detector 32, the data processor 33 calculates the difference. The difference is then sent to the metering wheel 38 inside the replenishment chamber 34, causing the metering wheel 38 to rotate. The number of rotations is equal to the number of rotations of the difference. The oil inside the storage chamber 35 enters the interior of the supply pipe 37 and is finally transported to the interior of the circulation pipe 11 through the delivery pipe 36.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the NTC temperature of automotive engine oil, comprising a circulation tube (11), characterized in that: The top surface of the circulation pipe (11) is connected to the detection chamber (12), and a fixing frame (13) is fixedly connected to one side of the front of the detection chamber (12). An extraction assembly (2) is provided on both the left and right sides of the detection chamber (12). The extraction assembly (2) includes an inlet pipe (21) which is embedded inside the detection chamber (12). An inlet chamber (22) is fixedly connected to the top of the inner wall of the right side of the circulation pipe (11). An inlet port (23) is provided on the inlet chamber (22). The inlet port (23) is connected to the inlet pipe (21). A heat-conducting plate (24) is fixedly connected to the back side of the detection chamber (12). A cooling fan (25) is fixedly connected to the surface of the heat-conducting plate (24). A detection probe (26) is embedded at the top of the detection chamber (12). An outlet port (27) is provided on the inner wall of the circulation pipe (11) away from the inlet chamber (22). The detection chamber (12) is internally embedded with a capacity detection component (3), which includes a liquid volume detection unit (31). The liquid volume detection unit (31) is embedded on the left side of the inner side of the detection chamber (12), and a liquid volume detection unit (32) is embedded on the right side. A data processor (33) connects the liquid volume detection unit (31) and the liquid volume detection unit (32). A replenishment chamber (34) is connected to the top surface of the detection chamber (12), and a storage chamber (35) is connected to the top of the replenishment chamber (34). A supply pipe (37) is embedded between the supply bin (34) and the storage bin (35). A conveying pipe (36) is also embedded inside the supply bin (34). The conveying pipe (36) extends into the inside of the circulation pipe (11). A partition plate (6) is embedded inside the supply bin (34). Two sets of partition plates (6) are provided. A metering wheel (38) is embedded between the two sets of partition plates (6). A wrapping plate (5) is fixedly connected to the inner wall of the supply bin (34). The wrapping plate (5) is included on the outer surface of the metering wheel (38). The engine oil introduced into the detection chamber (12) through the inlet pipe (21) first passes through the liquid level detection second (32) and then through the liquid level detection first (31) before being discharged into the circulation pipe (11) through another set of inlet pipes (21). The liquid level detection first (31) and liquid level detection second (32) are both equipped with a metering wheel (38), a separator (6) and a wrapping sheet (5). The detection chamber (12) is equipped with a filter assembly (4), which is located between the detection probe (26) and the liquid volume detection device (32). The filter assembly (4) includes a support frame (41), the top of which is located on both sides of the inner wall of the detection chamber (12). The support frame (41) is located between the detection probe (26) and the liquid volume detection device (32). A filter belt (42) is provided on the outer surface of the support frame (41); the oil passing through the filter belt (42) is temperature measured by the detection probe (26), and the measured value is displayed as a resistance value and uploaded to the computer terminal.

2. The automotive engine oil NTC temperature sensor detection device according to claim 1, characterized in that: The right side of the circulation pipe (11) is the inlet and the left side is the outlet. The liquid inlet chamber (22) is suspended at the top of the inner wall of the circulation pipe (11). The width of the liquid inlet chamber (22) is half the width of the inside of the circulation pipe (11).

3. The automotive engine oil NTC temperature sensor detection device according to claim 1, characterized in that: The inlet (23) is inclined upward on the inner wall of the circulation pipe (11) and is connected to the inlet pipe (21).

4. The automotive engine oil NTC temperature sensor detection device according to claim 1, characterized in that: The outer surface of the filter belt (42) is also uniformly provided with soft scraper strips (45).

5. The automotive engine oil NTC temperature sensor detection device according to claim 1, characterized in that: A sludge collection chamber (43) is also provided on one side of the support frame (41). One side wall of the sludge collection chamber (43) abuts against the scraper (45), and the top surface of the sludge collection chamber (43) is inclined.

6. The automotive engine oil NTC temperature sensor detection device according to claim 1, characterized in that: The package (5) is divided into a connecting part and an arc-shaped part. The connecting part is fixedly connected to the inner wall of the supply compartment (34), and the arc-shaped part is wrapped around the metering wheel (38).

7. The automotive engine oil NTC temperature sensor detection device according to claim 6, characterized in that: The connecting part on the package (5) is inclined and fixed on the inner wall of the supply compartment (34). The upper and lower inner walls of the supply compartment (34) are provided with package (5), and the two sets of connecting parts are combined to form a trumpet-shaped opening.

8. The automotive engine oil NTC temperature sensor detection device according to claim 7, characterized in that: The metering wheel (38) and the filter assembly (4) are rotatably connected. The surface of the metering wheel (38) is provided with three sets of inwardly recessed arc grooves. The number of rotations of the metering wheel (38) is uploaded to the inside of the data processor (33).

9. The application method of the automotive engine oil NTC temperature sensor detection device according to any one of claims 1-8, characterized in that: Extraction: The engine oil circulates inside the circulation pipe (11), and some engine oil is poured into the liquid inlet chamber (22), and then transported to the detection chamber (12) through the liquid inlet (23) and the liquid inlet pipe (21); In one measurement, the oil enters the interior of the detection chamber (12). When it passes through the liquid level detection device (32), it drives the metering wheel (38) inside the liquid level detection device (32) to rotate. The rotation of the metering wheel (38) uploads the number of rotations to the interior of the data processor (33). After filtration, the oil passing through the liquid level detector (32) passes through the filter belt (42), and impurities cannot pass through the filter holes on the filter belt (42). The motor on the support frame (41) drives the filter belt (42) to rotate, and the impurities adhere to the surface of the filter belt (42). The impurities are supported by the scraper (45), and then the impurities are poured into the inside of the sludge collection bin (43) for collection. The impurities are mixed with oil. Temperature detection: The oil passing through the filter belt (42) is measured by the detection probe (26), and the measured value is displayed as a resistance value and uploaded to the computer terminal. After secondary measurement, the oil flows into the inlet pipe (21) through the liquid level detector (31) after temperature detection, and finally returns to the inside of the circulation pipe (11). The oil drives the internal metering wheel (38) to rotate through the liquid level detector (31), and the number of rotations is uploaded to the data processor (33). When the number of rotations of the metering wheel (38) inside the liquid level detector (31) is less than the number of rotations of the metering wheel (38) inside the liquid level detector (32), the data processor (33) calculates the difference. The difference is sent to the metering wheel (38) inside the replenishment chamber (34), which drives the metering wheel (38) to rotate. The number of rotations is equal to the number of rotations of the difference. The oil inside the storage chamber (35) enters the interior of the supply pipe (37) and is finally transported to the interior of the circulation pipe (11) through the delivery pipe (36).

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