Gearbox oil circulation system

Abstract

The invention relates to the technical field of gearbox testing, in particular to a gearbox oil circulation system which comprises a clean oil tank, a dirty oil tank and multiple sets of gearbox testing columns, each gearbox testing column comprises a gearbox, one end of each gearbox is connected with an oil pumping pipeline, the other end of each gearbox is connected with an oil filling pipeline, and an oil pumping pump connected with the gearbox is arranged on each oil pumping pipeline; oil pumping pipelines of the multiple sets of gearbox testing columns are all converged into a main oil pumping pipeline, the main oil pumping pipeline is communicated with a dirty oil tank, the dirty oil tank is communicated with a clean oil tank, multiple sets of filters are arranged between the dirty oil tank and the clean oil tank, and the clean oil tank is communicated with the oil filling pipelines of the multiple sets of gearbox testing columns. Oil circulation filtration and performance testing of multiple gearboxes can be completed at the same time, and the equipment compactness and the production efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gearbox testing, and more particularly to a gearbox oil circulation system. Background Art

[0002] Most gearboxes require online calibration or performance testing after assembly. During the gearbox test, due to the meshing and operation of components such as gears, clutches, motors, and control valves, friction will produce a small amount of particulate matter. There may also be a small amount of dust, debris and other particulate matter that falls into the gearbox during processing and assembly and is washed away by the gearbox oil. These particles will remain in the gearbox oil. When the gearbox is installed, these suspended particles will become a hidden danger that causes the filter service life to fail to reach the expected, the valve body to become stuck, and the moving parts to wear abnormally. The metal dust and other foreign matter generated by the initial operation of the gearbox is much more than that generated by the fully run-in gearbox in the same period of time. Therefore, for gearbox production, it becomes more important to clean the inside of the gearbox during the initial test of the gearbox performance.

[0003] In the prior art, for example, Chinese patent CN117072657A discloses a gearbox oil pumping and refueling system, comprising a dirty oil tank, a clean oil tank and a gearbox; the inlet of the clean oil tank is connected to a clean oil replenishing pipe, on which a first pump, a first solenoid valve and a plurality of filters are provided; the clean oil tank is provided with a first outlet, a second outlet and a third outlet, the first outlet is connected to the dirty oil tank through a clean oil circulation pipe, the outlet of the dirty oil tank is connected to the clean oil replenishing pipe through a second solenoid valve, and the clean oil circulation pipe is also provided with a third solenoid valve and a second pump; the second outlet is connected to an oil drain pipe, on which a third pump is provided, and when the oil temperature in the clean oil tank is too high, the high-temperature oil is discharged to a waste oil treatment system via the oil drain pipe; the third outlet is connected to the inlet of the gearbox through a fifth solenoid valve and a fourth pump, and the outlet of the gearbox is connected to the clean oil circulation pipe, so that circulation filtration of the lubricating oil can be realized, but the system is only applicable to configuring an oil circulation filtration function for a single gearbox test bench, and cannot realize multiplex control and circulation filtration of multiple gearbox test benches. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiency of the prior art that it cannot realize the multiplex control and circulation filtration of multiple gearbox test benches, and to provide a gearbox oil circulation system that can simultaneously complete the oil circulation filtration and performance testing of multiple gearboxes, thereby improving the compactness of the equipment and the production efficiency.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A gearbox oil circulation system is provided, comprising a clean oil tank, a dirty oil tank and a plurality of gearbox test trains, the gearbox test train comprising a gearbox, one end of the gearbox being connected to an oil extraction pipeline, and the other end being connected to a refueling pipeline, the oil extraction pipeline being provided with an oil extraction pump connected to the gearbox, the refueling pipeline being provided with a refueling pump connected to the gearbox, the dirty oil tank being provided with a main oil extraction pipeline connected thereto, the oil extraction pipelines of the plurality of gearbox test trains all merge into the main oil extraction pipeline, the dirty oil tank being connected to the clean oil tank, a transfer pump and a plurality of filters connected to the transfer pump being provided between the dirty oil tank and the clean oil tank, and the clean oil tank being respectively connected to the refueling pipelines of the plurality of gearbox test trains.

[0007] The gearbox oil circulation system of the present invention first pumps the oil in the gearbox into the oil extraction pipeline through the oil extraction pump. The oil extraction pipelines on each gearbox test train are all collected into the main oil extraction pipeline, and enter the dirty oil tank through the main oil extraction pipeline. The transfer pump extracts the oil in the dirty oil tank, and enters the clean oil tank after filtering through multiple groups of filters. The refueling pipelines of each gearbox test train connect the clean oil tank and the gearbox. The refueling pump on the refueling pipeline pumps the oil in the clean oil tank into the gearbox to complete the gearbox oil circulation filtration. The gearbox oil circulation system of the present invention provides a unified oil circulation filtration system for multiple gearbox test benches, which can simultaneously complete the oil circulation filtration and gearbox performance testing of multiple gearboxes, thereby improving the compactness of the equipment and production efficiency.

[0008] Furthermore, the gearbox test train also includes a transfer oil tank, which is connected to the gearbox, the refueling pipeline is connected to the transfer oil tank, and the refueling pump is arranged between the transfer oil tank and the gearbox. The purpose of setting the transfer oil tank is to provide a buffer for the oil that is about to enter the gearbox. Due to the different distances from the clean oil tank, the oil temperature and flow rate in each refueling pipeline are also different. The transfer oil tank controls the temperature and flow rate of the gearbox oil in each pipeline to the same state, ensuring the stability of the flow rate and oil temperature control during the test.

[0009] Furthermore, the gearbox oil circulation system includes a PLC control system for monitoring real-time flow and cumulative flow, the oil extraction pipeline also includes an oil extraction flowmeter, the oil extraction flowmeter is connected to the oil extraction pump, a refueling flowmeter is provided between the refueling pump and the gearbox, and the PLC control system is connected to the refueling pump, the oil extraction pump, the oil extraction flowmeter and the refueling flowmeter signal. The real-time refueling volume of the refueling flowmeter will be recorded by the PLC control system and compared with the real-time oil extraction volume of the oil extraction flowmeter, and the working state of the refueling pump will be controlled by the PLC control system, thereby regulating the oil volume during the gearbox performance test.

[0010] Furthermore, the dirty oil tank is provided with a first liquid level gauge, the clean oil tank is provided with a second liquid level gauge, and the transfer oil tank is provided with a third liquid level gauge, and the first liquid level gauge, the second liquid level gauge, and the third liquid level gauge are all connected to the PLC control system by signal. The first liquid level gauge, the second liquid level gauge, and the third liquid level gauge can timely feed back the real-time oil volume in the dirty oil tank, the clean oil tank, and the transfer oil tank to the PLC control system, which, on the one hand, facilitates the PLC control system to realize automatic oil and liquid transportation between the oil tanks and realize intelligent circulation, and on the other hand, can timely issue a warning to the staff when the oil volume in a certain oil tank is abnormal.

[0011] Furthermore, the dirty oil tank, clean oil tank and transfer oil tank are all provided with a first liquid level and a second liquid level, and the first liquid level is higher than the second liquid level; when the first liquid level gauge detects that the dirty oil tank liquid level is at the first liquid level, and the second liquid level gauge detects that the clean oil tank liquid level is at the second liquid level, the dirty oil tank is controlled to add oil to the clean oil tank; when the third liquid level gauge detects that the transfer oil tank liquid level is at the second liquid level, the clean oil tank is controlled to transfer oil to the transfer oil tank until the transfer oil tank liquid level returns to the first liquid level. The first liquid level gauge cooperates with the second liquid level gauge to realize the first liquid level control of the clean oil tank liquid level, that is, when the clean oil tank liquid level is not at the first liquid level and the dirty oil tank is not at the second liquid level, the dirty oil tank will add oil to the clean oil tank. The third liquid level gauge realizes the first liquid level control in the transfer oil tank, that is, when the transfer oil tank liquid level is not at the first liquid level, the clean oil tank is controlled to transfer oil until the oil level is the first liquid level.

[0012] Furthermore, the filter includes a first filter, a second filter, a third filter, a fourth filter, a fifth filter, a sixth filter and a seventh filter; the first filter and the second filter are connected in sequence between the gearbox and the oil pump, the third filter is arranged between the oil pumping flow meter and the main oil pumping pipeline, the fourth filter, the fifth filter and the sixth filter are connected in sequence between the transfer pump and the clean oil tank, and the seventh filter is arranged between the transfer oil tank and the refueling pump. The first filter and the second filter provide a primary filtration for the oil in the gearbox, and the oil in the dirty oil tank passes through the fourth filter, the fifth filter and the sixth filter in sequence before entering the clean oil tank for secondary fine filtration to screen out the newly generated particulate matter during the test, and then enter the clean oil tank. After the oil flows out of the transfer oil tank, it enters the seventh filter for a third-level final filtration to ensure that dust and foreign matter in the gearbox will not enter the gearbox again, thereby avoiding affecting the service life of the gearbox.

[0013] Furthermore, a differential pressure sensor is provided on the third filter, and an air control valve is provided between the oil pumping flow meter and the third filter. The third filter and the air control valve are provided in multiple groups and are independent of each other. The third filter is equipped with a differential pressure sensor. When the filter element is blocked, an alarm will be sounded and the staff will be prompted to replace it. Multiple groups of independent third filters and air control valves maintain a parallel structure. When the filter element on a branch is blocked, it is only necessary to close the air control valve on the corresponding branch and open the air control valves on other branches. There is no need to stop the machine to replace the filter element, thereby improving the test efficiency.

[0014] Furthermore, a circulating oil pump for driving the self-circulation of the clean oil tank is provided between the clean oil tank and the fourth filter. When the gearbox test train is idle, the circulating oil pump is started to realize the circulation and self-cleaning of the clean oil tank. The circulating oil pump is used for the self-circulation of the clean oil tank. When the gearbox test train is idle, it is started to circulate and self-clean the gearbox oil in the clean oil tank. The oil circuit in the gearbox test process is shared. The frequency and duration of starting the self-circulation can be set to clean the gearbox oil and extend the service life of the equipment.

[0015] Furthermore, a magnetic rod is provided in the dirty oil tank for separating the impurities in the dirty oil. The magnetic rod is configured in the dirty oil tank for further separating the iron particles in the dirty oil, so as to avoid these suspended iron particles causing the service life of the filter to fail to reach the expected value, the valve body to become stuck, or the moving parts to wear abnormally.

[0016] Furthermore, a cooler is provided between the dirty oil tank and the clean oil tank, and a first temperature sensor is provided in the cooler. A heater and a second temperature sensor are provided in the dirty oil tank, the clean oil tank and the transfer oil tank. The first temperature sensor is provided with a first temperature threshold, and the second temperature sensor is provided with a second temperature threshold. When the detection value of the first temperature sensor is greater than the first temperature threshold, the cooler is started; when the detection value of the second temperature sensor is less than the second temperature threshold, the heater is started. The first temperature threshold is the highest temperature of the oil during the transmission oil circulation test. When the first temperature sensor detects that the oil temperature exceeds the first temperature threshold, the cooler is started to adjust the oil temperature and reduce the oil temperature. The second temperature threshold is the lowest temperature of the oil during the transmission oil circulation test. The test requires the control of the transmission oil temperature. As the transportation distance increases, the temperature in the pipeline will gradually decrease, resulting in a large difference in the oil temperature in the multiple-train equipment. By providing heaters in the dirty oil tank, the clean oil tank and the transfer oil tank, the oil temperature in each transmission test train is ensured to be the same.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. It realizes the multiple-column control of multiple gearbox test benches, and can complete the oil circulation filtration and performance test of multiple gearboxes at the same time, improving the compactness of the equipment;

[0019] 2. Through real-time monitoring and frequency conversion control of the inlet and outlet oil flows, the oil volume of the gearbox can be kept stable during operation;

[0020] 3. Improve the cleanliness of the transmission oil during the test and ensure that the transmission oil always meets the temperature requirements for the transmission's rated operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the gearbox oil circulation system;

[0022] Figure 2 It is a schematic diagram of the structure of the gearbox test train;

[0023] Figure 3 It is a structural schematic diagram of the clean oil tank;

[0024] Figure 4 This is a schematic diagram of the structure of the dirty oil tank.

[0025] In the attached figure: 100, clean oil tank; 110, second liquid level gauge; 200, dirty oil tank; 210, first liquid level gauge; 220, magnetic rod; 310, gearbox; 320, oil extraction pipeline; 321, oil extraction pump; 322, oil-gas separator; 323, oil extraction flow meter; 324, first filter; 325, second filter; 326, third filter; 327, air control valve; 330, refueling pipeline; 331, refueling pump ; 332, refueling flow meter; 333, the seventh filter; 340, the main oil pumping pipeline; 350, the transfer oil tank; 351, the third liquid level meter; 410, the fourth filter; 420, the fifth filter; 430, the sixth filter; 500, the circulating oil pump; 600, the cooler; 700, the heater; 710, the second temperature sensor; 800, the transfer pump; 910, the refueling machine; 920; the oil pump; 930, the oil drum. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with specific implementation methods. The accompanying drawings are only used for exemplary descriptions and are only schematic diagrams, not actual drawings, and cannot be understood as limiting this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0027] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] Embodiment 1

[0029] This embodiment is the first embodiment of the gearbox oil circulation system, including a clean oil tank 100, a dirty oil tank 200 and a plurality of gearbox test trains, the gearbox test train including a gearbox 310, one end of the gearbox 310 is connected to an oil extraction pipeline 320, and the other end is connected to a refueling pipeline 330, the oil extraction pipeline 320 is provided with an oil extraction pump 321 connected to the gearbox 310, the refueling pipeline 330 is provided with a refueling pump 331 connected to the gearbox 310, the dirty oil tank 200 is provided with a main oil extraction pipeline 340 connected thereto, the oil extraction pipelines 320 of the plurality of gearbox test trains are all merged into the main oil extraction pipeline 340, the dirty oil tank 200 is connected to the clean oil tank 100, a transfer pump 800 and a plurality of filters connected to the transfer pump 800 are provided between the dirty oil tank 200 and the clean oil tank 100, and the clean oil tank 100 is respectively connected to the refueling pipelines 330 of the plurality of gearbox test trains. Figure 1 As shown, the gearbox oil circulation system in this embodiment first pumps the oil in the gearbox 310 into the oil extraction pipeline 320 through the oil extraction pump 321, and the oil extraction pipelines 320 on each gearbox test train are all collected into the main oil extraction pipeline 340, and enter the dirty oil tank 200 through the main oil extraction pipeline 340, and the transfer pump 800 extracts the oil in the dirty oil tank 200, and enters the clean oil tank 100 after being filtered by multiple groups of filters, and the refueling pipeline 330 of each gearbox test train connects the clean oil tank 100 and the gearbox 310, and the refueling pump 331 on the refueling pipeline 330 pumps the oil in the clean oil tank 100 into the gearbox 310, completing the oil circulation filtration of the gearbox 310.

[0030] The gearbox test train further includes a transfer tank 350, the transfer tank 350 is connected to the gearbox 310, the refueling pipeline 330 is connected to the transfer tank 350, and the refueling pump 331 is arranged between the transfer tank 350 and the gearbox 310. Figure 2As shown, in this embodiment, multiple gearboxes 310 need to be re-controlled. During the test, there is air in the pipeline. If the circulation is carried out only by the clean oil tank 100, the flow detection value will be inaccurate, resulting in too much or too little oil during the test of the gearbox 310, which will damage the gearbox 310; the distances between the gearbox 310 and the clean oil tank 100 are different. If the oil is transported only by the clean oil tank 100, the amount of oil obtained by the equipment at a closer distance and the equipment at a farther distance will be different; the test process requires the control of the oil temperature of the gearbox 310. As the transportation distance increases, the temperature in the pipeline will gradually decrease, resulting in a large difference in the oil temperature in the re-trained equipment. In order to avoid the above problems, a transfer oil tank 350 is provided in the gearbox test column. The transfer oil tank 350 provides a buffer for the oil that is about to enter the gearbox 310. Due to the different distances from the clean oil tank 100, the oil temperature and flow rate in each refueling pipeline 330 are also different. The transfer oil tank 350 controls the temperature and flow rate of the gearbox 310 oil in each pipeline to the same state, thereby ensuring the stability of the flow rate and oil temperature control during the test.

[0031] The gearbox oil circulation system also includes a PLC control system for monitoring real-time flow and cumulative flow. The oil extraction pipeline 320 also includes an oil-gas separator 322 and an oil extraction flow meter 323. The oil-gas separator 322 is connected to the oil extraction pump 321, and the oil extraction flow meter 323 is connected to the oil-gas separator 322. A refueling flow meter 332 is provided between the refueling pump 331 and the gearbox 310. The PLC control system is connected to the refueling pump 331, the oil extraction pump 321, the oil-gas separator 322, the oil extraction flow meter 323 and the refueling flow meter 332. The oil-gas separator 322 has a built-in tuning fork switch and a piston pressurizing device. When there is gas in the oil, the piston will be used to pressurize the oil to squeeze out the air in the oil, and send a signal to the PLC control system through the tuning fork switch. The PLC control system controls the solenoid valve to open and discharge the floating gas, thereby ensuring that the flow value collected by the oil extraction flow meter 323 is accurate. The PLC control system can set various parameters, including controlling the step frequency, flow difference, etc. The PLC control system polls the real-time flow of all oil tanks. Under the action of the oil-gas separator 322, the flow meter reading can be approximated to the actual oil flow. The PLC control system calculates the difference between the oil pumping flow meter 323 and the refueling flow meter 332, and controls the oil volume in the gearbox 310 to be within the normal range according to the flow difference. The PLC control system can monitor the real-time flow and the accumulated flow at the same time. When the accumulated flow deviates and exceeds the set threshold, the flow regulation will also be triggered to ensure the flow stability over a longer working cycle.

[0032] The refueling pump 331 in this embodiment can be equipped with a frequency converter to adjust the refueling flow rate, thereby adjusting the flow rate in real time. The real-time refueling volume of the refueling flow meter 332 will be recorded by the PLC control system and compared with the real-time oil extraction volume of the oil extraction flow meter 323. During the cycle, the frequency converter frequency of the refueling pump 331 defaults to the set value. When the difference between the reading of the oil extraction flow meter 323 and the reading of the refueling flow meter 332 is greater than the preset threshold, the PLC control system will control the frequency converter of the refueling pump 331, and increase or decrease the frequency of the refueling motor in the refueling pump 331 according to the size of the difference, thereby changing the refueling flow rate. The maximum adjustment range of the frequency converter is 0Hz to 50Hz, and the lowest and highest frequencies can be set to change the adjustment range. The frequency conversion control of the pump is step-by-step. When the motor frequency is increased and the flow rate is increased, if the speed of change of the difference between the oil extraction flow rate and the refueling flow rate does not decrease or increase as expected, the PLC will continue to convert the frequency of the refueling motor until it reaches the expected value. The interval time of each frequency conversion operation is 30ms, which can ensure that the oil volume control process is stable and rapid.

[0033] like Figure 1 , Figure 3 , Figure 4 As shown, in this example, the dirty oil tank 200 is provided with a first liquid level gauge 210, the clean oil tank 100 is provided with a second liquid level gauge 110, and the transfer oil tank 350 is provided with a third liquid level gauge 351. The first liquid level gauge 210, the second liquid level gauge 110 and the third liquid level gauge 351 are all connected to the PLC control system signal. The first liquid level gauge 210, the second liquid level gauge 110 and the third liquid level gauge 351 can timely feed back the real-time oil volume in the dirty oil tank 200, the clean oil tank 100 and the transfer oil tank 350 to the PLC control system, which is convenient for the PLC control system to realize automatic oil and liquid transportation between the oil tanks and realize intelligent circulation, and can also issue a warning to the staff in time when the oil volume in a certain oil tank is abnormal.

[0034] In this embodiment, the dirty oil tank 200, the clean oil tank 100 and the transfer oil tank 350 are all provided with a first liquid level and a second liquid level, and the first liquid level is higher than the second liquid level; when the first liquid level gauge 210 detects that the liquid level of the dirty oil tank 200 is at the first liquid level, and the second liquid level gauge 110 detects that the liquid level of the clean oil tank 100 is at the second liquid level, the dirty oil tank 200 is controlled to add oil to the clean oil tank 100; when the third liquid level gauge 351 detects that the liquid level of the transfer oil tank 350 is at the second liquid level, the clean oil tank 100 is controlled to transfer oil to the transfer oil tank 350 until the liquid level of the transfer oil tank 350 returns to the first liquid level, and the first liquid level is higher than the second liquid level. The first liquid level gauge 210 cooperates with the second liquid level gauge 110 to realize the first liquid level control of the liquid level of the clean oil tank 100, that is, when the liquid level of the clean oil tank 100 is not at the first liquid level and the dirty oil tank 200 is not at the second liquid level, the dirty oil tank 200 will add oil to the clean oil tank 100. The third liquid level meter 351 realizes the first liquid level control in the transfer oil tank 350, that is, when the liquid level of the transfer oil tank 350 is not at the first liquid level, the clean oil tank 100 is made to transport oil until the oil level reaches the first liquid level.

[0035] like Figure 1 As shown, the gearbox oil circulation system in this embodiment has good ductility, and the gearbox 310 oil of the entire system can be circulated together by connecting an external oiler 910 and an oil pump 920. When the total oil volume is insufficient, the gearbox 310 oil will be automatically replenished from an oil barrel 930 or other oil storage device.

[0036] The working principle of the gearbox oil circulation system in this embodiment is as follows: the gearbox oil circulation system in this embodiment firstly pumps the oil in the gearbox 310 into the oil pumping pipeline 320 through the oil pumping pump 321, and the oil pumping pipelines 320 on each gearbox test train are all collected into the main oil pumping pipeline 340, and enter the dirty oil tank 200 through the main oil pumping pipeline 340, and the transfer pump 800 pumps the oil in the dirty oil tank 200, and enters the clean oil tank 100 after being filtered by multiple groups of filters, and the refueling pipeline 330 of each gearbox test train connects the clean oil tank 100 and the gearbox 310, and the refueling pump 331 on the refueling pipeline 330 pumps the oil in the clean oil tank 100 into the gearbox 310, completing the oil circulation filtration of the gearbox 310. The gearbox test train also includes a transfer oil tank 350 connected to the gearbox 310 and the refueling pipeline 330. During the circulation process, the PLC control system collects data from the oil extraction flow meter 323 and the refueling flow meter 332, thereby adjusting the working state of the refueling pump 331 to keep the oil amount in the transmission oil circulation system stable.

[0037] Embodiment 2

[0038] This embodiment is the second embodiment of the gearbox oil circulation system. This embodiment is similar to the first embodiment, except that the filters include a first filter 324, a second filter 325, a third filter 326, a fourth filter 410, a fifth filter 420, a sixth filter 430 and a seventh filter 333; the first filter 324 and the second filter 325 are connected in sequence between the gearbox 310 and the oil pump 321, the third filter 326 is arranged between the oil flow meter 323 and the main oil pumping pipeline 340, the fourth filter 410, the fifth filter 420 and the sixth filter 430 are connected in sequence between the transfer pump 800 and the clean oil tank 100, and the seventh filter 333 is arranged between the transfer oil tank 350 and the refueling pump 331. Figure 2 As shown, the first filter 324 and the second filter 325 provide a primary filtration for the oil in the gearbox 310. Before the oil in the dirty oil tank 200 enters the clean oil tank 100, it first passes through the fourth filter 410, the fifth filter 420 and the sixth filter 430 for secondary fine filtration, and removes the newly generated particulate matter during the test, and then enters the clean oil tank 100. After the oil flows out of the transfer tank 350, it enters the seventh filter 333 for a third-level final filtration to ensure that the metal dust generated by the initial operation of the gearbox 310 will not enter the gearbox 310, so as to avoid affecting the service life of the gearbox 310. The second filter 325 in this embodiment can be selected as a magnetic filter to adsorb various magnetic impurities in the oil.

[0039] A pressure differential sensor is provided on the third filter 326, and an air control valve 327 is provided between the oil pumping flow meter 323 and the third filter 326. There are multiple sets of third filters 326 and air control valves 327 that are independent of each other. The third filter 326 is equipped with a pressure differential sensor. When the filter element is clogged, an alarm will be sounded to prompt the staff to replace it. Multiple sets of independent third filters 326 and air control valves 327 maintain a parallel structure. When the filter element on one branch is clogged, it is only necessary to close the air control valve 327 on the corresponding branch and open the air control valves 327 on other branches. There is no need to stop the machine to replace the filter element, thereby improving the test efficiency.

[0040] like Figure 1 As shown, the oil circuit composed of the fourth filter 410, the fifth filter 420, and the sixth filter 430 in this embodiment can also be set as two oil circuits connected in parallel. The two oil circuits are provided with the fourth filter 410, the fifth filter 420, and the sixth filter 430, one for use and the other for backup. When the filter element is clogged, the backup oil circuit can be used directly without stopping the machine.

[0041] A circulating oil pump 500 is provided between the clean oil tank 100 and the fourth filter 410 for driving the clean oil tank 100 to self-circulate. When the gearbox test train is idle, the circulating oil pump 500 is started to realize the circulating self-cleaning of the clean oil tank 100. The circulating oil pump 500 is used for the self-circulation of the clean oil tank 100. When the gearbox test train is idle, the circulating oil pump 500 is started to extract the oil in the clean oil tank 100, and then returns to the clean oil tank 100 through the fourth filter 410, the fifth filter 420, and the sixth filter 430, so as to realize the circulating self-cleaning of the gearbox 310 oil in the clean oil tank 100. The frequency and duration of starting the self-circulation can be set to realize the cleaning of the gearbox 310 oil and the extension of the service life of the equipment.

[0042] like Figure 3 , Figure 4 As shown, in this embodiment, both the clean oil tank 100 and the dirty oil tank 200 can be equipped with a magnetic rod 220 for further separating the iron particles in the dirty oil to prevent these suspended iron particles from causing the filter to have a service life that cannot reach the expected level, the valve body to become stuck, or the moving parts to wear abnormally.

[0043] The working principle of the gearbox oil circulation system of this embodiment is as follows: the first filter 324 and the second filter 325 provide a primary filtration for the oil in the gearbox 310. Before the oil in the dirty oil tank 200 enters the clean oil tank 100, it first passes through the fourth filter 410, the fifth filter 420 and the sixth filter 430 in sequence for secondary fine filtration to screen out and reduce the newly generated particulate matter during the test, and then enters the clean oil tank 100. After the oil flows out of the transfer oil tank 350, it enters the seventh filter 333 for a third-level final filtration.

[0044] Embodiment 3

[0045] This embodiment is the third embodiment of the gearbox oil circulation system. This embodiment is similar to the first embodiment, except that a cooler 600 is provided between the dirty oil tank 200 and the clean oil tank 100, and a first temperature sensor is provided in the cooler 600. A heater 700 and a second temperature sensor 710 are provided in the dirty oil tank 200, the clean oil tank 100 and the transfer oil tank 350. The first temperature sensor is provided with a first temperature threshold, and the second temperature sensor 710 is provided with a second temperature threshold. When the detection value of the first temperature sensor is greater than the first temperature threshold, the cooler 600 is activated; when the detection value of the second temperature sensor 710 is less than the second temperature threshold, the heater 700 is activated. Figure 3 , Figure 4As shown, before the gearbox 310 is tested, it is necessary to add gearbox 310 oil to the gearbox 310 and control the oil temperature to meet the test requirements. If the oil temperature does not meet the standard, the test and calibration results of the gearbox 310 will produce errors, thereby affecting the quality judgment and subsequent use. The first temperature threshold in this embodiment is the highest temperature of the oil during the gearbox 310 oil circulation test. When the first temperature sensor detects that the oil temperature exceeds the first temperature threshold, the cooler 600 is started to adjust the oil temperature and reduce the oil temperature; the second temperature threshold is the lowest temperature of the oil during the gearbox 310 oil circulation test. The test requires the control of the gearbox 310 oil temperature. As the transportation distance increases, the temperature in the pipeline will gradually decrease, resulting in a large difference in the oil temperature in the multiplex equipment. By setting a heater 700 in the dirty oil tank 200, the clean oil tank 100 and the transfer oil tank 350, the oil temperature in each gearbox test column is ensured to be the same.

[0046] The working principle of the gearbox oil circulation system of this embodiment is as follows: the first temperature threshold is the highest temperature of the oil during the oil circulation test of the gearbox 310. When the first temperature sensor detects that the oil temperature exceeds the first temperature threshold, the cooler 600 is started to adjust the oil temperature and reduce the oil temperature; the second temperature threshold is the lowest temperature of the oil during the oil circulation test of the gearbox 310. When the second temperature sensor 710 detects that the oil temperature is lower than the second temperature threshold, the heater 700 is started to increase the oil temperature to ensure that the oil temperature is always maintained in an appropriate range during the test.

[0047] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A gearbox oil circulation system, characterized in that: The invention comprises a clean oil tank (100), a dirty oil tank (200) and a plurality of gearbox test trains, wherein the gearbox test train comprises a gearbox (310), one end of the gearbox (310) is connected to an oil extraction pipeline (320), and the other end is connected to a refueling pipeline (330), the oil extraction pipeline (320) is provided with an oil extraction pump (321) connected to the gearbox (310), the refueling pipeline (330) is provided with a refueling pump (331) connected to the gearbox (310), and the dirty oil tank (200) is provided with a refueling pump (331) connected to the gearbox (310). 0) is provided with a main oil extraction pipeline (340) in communication therewith, and multiple groups of oil extraction pipelines (320) of the gearbox test trains are all merged into the main oil extraction pipeline (340), the dirty oil tank (200) is in communication with the clean oil tank (100), a transfer pump (800) and multiple groups of filters connected to the transfer pump (800) are provided between the dirty oil tank (200) and the clean oil tank (100), and the clean oil tank (100) is respectively in communication with multiple groups of refueling pipelines (330) of the gearbox test trains.

2. The transmission oil circulation system according to claim 1, characterized in that: The gearbox test train further comprises a transfer oil tank (350), the transfer oil tank (350) is in communication with the gearbox (310), the refueling pipeline (330) is in communication with the transfer oil tank (350), and the refueling pump (331) is arranged between the transfer oil tank (350) and the gearbox (310).

3. The transmission oil circulation system according to claim 2, characterized in that: The gearbox oil circulation system further comprises a PLC control system for monitoring real-time flow and accumulated flow. The oil extraction pipeline (320) further comprises an oil extraction flow meter (323). The oil extraction flow meter (323) is connected to the oil extraction pump (321). A refueling flow meter (332) is provided between the refueling pump (331) and the gearbox (310). The PLC control system is signal-connected to the refueling pump (331), the oil extraction pump (321), the oil extraction flow meter (323) and the refueling flow meter (332).

4. The transmission oil circulation system according to claim 3, characterized in that: The dirty oil tank (200) is provided with a first liquid level gauge (210), the clean oil tank (100) is provided with a second liquid level gauge (110), and the transfer oil tank (350) is provided with a third liquid level gauge (351); the first liquid level gauge (210), the second liquid level gauge (110) and the third liquid level gauge (351) are all connected to the PLC control system signal.

5. The transmission oil circulation system according to claim 4, characterized in that: The dirty oil tank (200), the clean oil tank (100) and the transfer oil tank (350) are all provided with a first liquid level and a second liquid level, wherein the first liquid level is higher than the second liquid level; when the first liquid level meter (210) detects that the liquid level of the dirty oil tank (200) is at the first liquid level and the second liquid level meter (110) detects that the liquid level of the clean oil tank (100) is at the second liquid level, the dirty oil tank (200) is controlled to replenish oil to the clean oil tank (100); when the third liquid level meter (351) detects that the liquid level of the transfer oil tank (350) is at the second liquid level, the clean oil tank (100) is controlled to transfer oil to the transfer oil tank (350) until the liquid level of the transfer oil tank (350) returns to the first liquid level.

6. The transmission oil circulation system according to any one of claims 3 to 5, characterized in that: The filter comprises a first filter (324), a second filter (325), a third filter (326), a fourth filter (410), a fifth filter (420), a sixth filter (430) and a seventh filter (333); the first filter (324) and the second filter (325) are connected in sequence between the gearbox (310) and the oil pump (321); the third filter (326) is arranged between the oil pumping flow meter (323) and the main oil pumping pipeline (340); the fourth filter (410), the fifth filter (420) and the sixth filter (430) are connected in sequence between the transfer pump (800) and the clean oil tank (100); and the seventh filter (333) is arranged between the transfer oil tank (350) and the refueling pump (331).

7. The transmission oil circulation system according to claim 6, characterized in that: A differential pressure sensor is provided on the third filter (326), an air control valve (327) is provided between the oil pumping flow meter (323) and the third filter (326), and the third filter (326) and the air control valve (327) are provided in multiple groups and are independent of each other.

8. The transmission oil circulation system according to claim 6, characterized in that: A circulating oil pump (500) for driving the clean oil tank (100) to self-circulate is provided between the clean oil tank (100) and the fourth filter (410); when the gearbox test train is idle, the circulating oil pump (500) is started to achieve circulating self-purification of the clean oil tank (100).

9. The transmission oil circulation system according to claim 1, characterized in that: The dirty oil tank (200) is provided with a magnetic rod (220) for separating dirty oil impurities.

10. The transmission oil circulation system according to claim 1, characterized in that: A cooler (600) is provided between the dirty oil tank (200) and the clean oil tank (100), and a first temperature sensor is provided in the cooler (600). A heater (700) and a second temperature sensor (710) are provided in the dirty oil tank (200), the clean oil tank (100) and the transfer oil tank (350); the first temperature sensor is provided with a first temperature threshold, and the second temperature sensor (710) is provided with a second temperature threshold. When the detection value of the first temperature sensor is greater than the first temperature threshold, the cooler (600) is started; when the detection value of the second temperature sensor (710) is less than the second temperature threshold, the heater (700) is started.

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