Oiling device for off-line test of gearbox rack

Abstract

The utility model discloses a refueling device for a gearbox rack offline test, which comprises a base, a clean oil tank and a dirty oil tank are arranged on the base, and a filter assembly is connected between an oil inlet of the clean oil tank and an oil outlet of the dirty oil tank; an oil outlet of the clean oil tank and an oil inlet of the dirty oil tank are connected with a first reversing valve through oil pipes respectively, the first reversing valve is connected with a second oil pump through an oil pipe, the second oil pump is connected with a second reversing valve, and the second reversing valve is connected with an oil filling pipe and an oil pumping pipe respectively. The oil pumping pipe is used for connecting an oil outlet of a gearbox. According to the device, a worker only needs to control the first reversing valve, the second reversing valve and the second oil pump to work, oil adding and oil pumping work of the gearbox can be completed, the workload of the worker is reduced, meanwhile, the clean oil tank and the dirty oil tank are both fixed to the base, when the device is collided, oil cannot be spilled out, and the safety of the device is improved. And the environment of a test platform before delivery of the gearbox is protected.

Description

Technical Field

[0001] The utility model belongs to the technical field of refueling equipment, and in particular relates to a refueling device used for off-line testing of a gearbox bench. Background Art

[0002] After the gearbox is assembled, it needs to be tested on a bench before leaving the factory to ensure that the gearbox is qualified. During the gearbox bench test, an oil filter trolley is generally used to transport oil to the gearbox.

[0003] At present, the common oil filter cart includes a filter cartridge, an oil pump and an oil suction pipe are arranged on the filter cartridge, and the oil pump is connected with a filling pipe and a motor. When in use, the oil suction pipe is inserted into the oil barrel, the filling pipe is put into the filling funnel, the filling funnel is inserted into the filling port of the gearbox, the motor is started to drive the oil pump, and oil is filled into the gearbox. After the oil is filled, the filling funnel and the filling pipe are removed, and the screw plug at the filling port of the gearbox is tightened to complete the refueling operation. After the gearbox has completed the bench off-line test, open the screw plug at the bottom of the gearbox oil pan, then put the oil in the gearbox into a separately prepared oil box, put the oil suction pipe of the oil filter trolley into the oil box, and then put the oil filling pipe of the oil filter trolley into the equipped first oil barrel, start the oil filter trolley to suck all the oil in the oil box into the first oil barrel, and then use the oil filter trolley again to pump the oil in the first oil barrel into the second oil tank, and filter the oil by reciprocating the oil filter trolley between the first oil barrel and the second oil barrel. During the test of the gearbox before leaving the factory, although the oil filter trolley can add oil to the gearbox and filter the tested oil in the gearbox, When using the oil filter cart, multiple oil drums need to be prepared for assistance, which is inconvenient and time-consuming, thereby making the gearbox test efficiency low before delivery. At the same time, the placement of multiple oil drums requires a large area, so that the platform used for the test of a single gearbox before delivery occupies a large space in the workshop, and the oil drum used for filtering needs to have its cover removed when in use. During use, due to staff errors, the oil drum is prone to tipping over, causing the oil to spill on the ground, damaging the test environment of the gearbox before delivery, and the spilled oil will make the ground around the gearbox test platform before delivery slippery, which can easily cause staff to fall here and cause safety accidents. Utility Model Content

[0004] In order to solve the problems that the existing oil filter cart needs to prepare an oil barrel to assist in the factory test of the gearbox, which is inconvenient to use and the oil barrel is easily spilled due to the open setting, the utility model provides a refueling device for the gearbox bench offline test.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A refueling device for off-line testing of a gearbox bench comprises a base, a clean oil tank and a dirty oil tank are arranged on the base, and a filter assembly is connected between an oil inlet of the clean oil tank and an oil outlet of the dirty oil tank;

[0007] The oil outlet of the clean oil tank and the oil inlet of the dirty oil tank are respectively connected to a first reversing valve through an oil pipe, the first reversing valve is connected to a second oil pump through an oil pipe, the second oil pump is connected to a second reversing valve, the second reversing valve is respectively connected to a refueling pipe and an oil extraction pipe, the refueling pipe is used to connect to the refueling port of the gearbox, and the oil extraction pipe is used to connect to the oil drain port of the gearbox;

[0008] When adding oil into the gearbox, the first reversing valve connects the oil circuit of the clean oil tank with the second oil pump, and the second reversing valve connects the oil filling pipe with the oil circuit of the second oil pump, so that oil is added to the gearbox through the second oil pump; when extracting oil from the gearbox, the first reversing valve is switched to connect the oil circuit of the dirty oil tank with the second oil pump, and the second reversing valve is switched to connect the oil extraction pipe with the oil circuit of the second oil pump, so that oil in the gearbox is extracted through the second oil pump.

[0009] Preferably, the filter assembly includes an installation box, which is installed on the base, and a first oil pump is installed in the installation box, the oil outlet of the first oil pump is connected to the oil inlet of the clean oil tank, the oil inlet of the first oil pump is connected to the oil outlet of the filter unit, and the oil inlet of the filter unit is connected to the oil outlet of the dirty oil tank.

[0010] Preferably, the filter unit comprises a mounting sleeve, one end port of the mounting sleeve is connected to the oil inlet of the first oil pump, and the other end port of the mounting sleeve is connected to the oil outlet of the dirty oil tank;

[0011] A plurality of filter plates are arranged in the installation sleeve along its axial direction, and the filtering accuracy of the plurality of filter plates gradually increases from the end connected to the dirty oil tank to the end connected to the second oil pump.

[0012] Preferably, the filtering accuracy of the filter plate is 0.1 to 5 microns.

[0013] Preferably, a filter screen is provided in the dirty oil tank at the position of the oil outlet.

[0014] Preferably, the filtering accuracy of the filter is 10 to 12 microns.

[0015] Preferably, threaded joints are provided on the ends of the refueling pipe and the oil extraction pipe away from the second reversing valve, the threaded joint connected to the refueling pipe is used to connect to the refueling port of the gearbox, and the threaded joint connected to the oil extraction pipe is used to connect to the oil drain port of the gearbox.

[0016] Preferably, the first reversing valve and the second reversing valve are both two-position three-way electromagnetic reversing valves.

[0017] Preferably, the second oil pump is connected to a second motor, and the second motor is a bidirectional motor.

[0018] Preferably, the dirty oil tank and the clean oil tank are both provided with a liquid level alarm assembly, the liquid level alarm assembly comprises a warning light and a limiter, and the limiter is connected to the warning light signal.

[0019] Compared with the prior art, the utility model has the following beneficial technical effects:

[0020] The oil pump of this invention is connected with the oil pump of second oil pump through oil pipe, and the oil circuit of second oil pump is connected with the oil pump of second oil pump through oil pipe, so as to form the oil circuit for filling oil into gearbox and the oil circuit for extracting oil from gearbox, and the switching between the two oil circuits is realized by the switching of the first reversing valve and the second reversing valve, so that the oil pump of this invention does not need to place the oil barrel and the oil box for assisting in the process of filling oil into gearbox and extracting oil, thereby improving the convenience of filling oil and extracting oil in the process of gearbox before delivery test, and saving The time for the gearbox test before delivery is shortened, and during the use of the device, the staff only needs to control the first reversing valve, the second reversing valve and the second oil pump to complete the refueling and oil extraction work of the gearbox, which reduces the need for the staff to constantly exchange the two oil pipe positions on the oil filter trolley when using the oil filter trolley, thereby avoiding the spillage of oil and keeping the gearbox factory test platform clean and tidy; at the same time, the clean oil tank and the dirty oil tank in the device are both fixed on the base, and the clean oil tank and the dirty oil tank are sealed at the top, so that when the device is collided, the oil in the clean oil tank and the dirty oil tank will not spill, thereby protecting the environment of the platform where the gearbox is tested before delivery.

[0021] Furthermore, the device is provided with a filtering assembly between the clean oil tank and the dirty oil tank. The first oil pump is driven by the first motor in the filtering assembly to suck the oil in the dirty oil tank into the filtering part for filtration, and then the filtered clean oil is input into the clean oil tank for waiting for use, thereby realizing the filtration of the oil. The filtration is convenient, and no external factors will affect the oil during the filtration process, thereby ensuring the cleanliness of the oil.

[0022] Furthermore, the filtering part in the present device includes a mounting sleeve, in which a plurality of filter plates are arranged, through which the oil is filtered layer by layer, thereby ensuring the cleanliness of the oil filtration; and the filtering accuracy of the filter plate is 0.1 to 5 microns, thereby ensuring the filtering accuracy of the oil filtration, so that the filtered oil meets the cleanliness requirements for oil use.

[0023] Furthermore, in the device, a filter is provided at the oil outlet in the dirty oil tank. The filtering accuracy of the filter is 10 to 12 microns. The oil in the dirty oil tank is initially filtered to filter out large particles in the oil, so that particles smaller than 10 microns in the oil enter the filter assembly for filtration, thereby preventing large particles from pouring into the filter section, which would make the filter section easily clogged.

[0024] Furthermore, in the present device, threaded joints are provided on the end heads of the filling pipe and the oil extraction pipe, through which the filling pipe and the oil extraction pipe can be stably fixed at corresponding positions on the gearbox to prevent them from falling off during the gearbox test and causing the oil in the gearbox to spill.

[0025] Furthermore, in this device, liquid level alarm components are provided on the dirty oil tank and the clean oil tank. The height of the oil in the dirty oil tank and the clean oil tank is detected by the limiter in the alarm component. When the height of the oil in the dirty oil tank and the clean oil tank exceeds the limit, a warning light is used to warn, thereby protecting the stability and safety of the operation of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural schematic diagram of a refueling device for off-line testing of a gearbox bench provided by the utility model;

[0027] Figure 2 This is a structural schematic diagram of a filter unit in a refueling device for off-line testing of a gearbox bench provided by the utility model;

[0028] Figure 3 The utility model provides a hydraulic principle diagram of a refueling device for off-line testing of a gearbox bench.

[0029] In the attached drawings: 1. clean oil tank; 2. filter assembly; 20. installation box; 21. first oil pump; 22. filter unit; 220. installation sleeve; 221. filter plate; 23. first motor; 3. dirty oil tank; 4. first reversing valve; 5. second oil pump; 6. second reversing valve; 7. oil extraction pipe; 8. oil drain port; 9. refueling port; 10. refueling pipe; 11. second motor; 12. threaded joint; 13. oil pipe; 14. base; 15. liquid level alarm assembly; 150. warning light; 151. limiter. DETAILED DESCRIPTION

[0030] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly stipulated and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0036] See 1- Figure 3The utility model provides a refueling device for off-line testing of a gearbox bench, the device comprises a base 14, a clean oil tank 1 and a dirty oil tank 3 are arranged on the upper end surface of the base 14 near one end thereof, the oil inlet of the clean oil tank 1 and the oil outlet of the dirty oil tank 3 are respectively connected to one end of an oil pipe 13, and a filter assembly 2 is commonly connected to the other end ports of the two oil pipes 13, the filter assembly 2 is used for filtering the oil between the dirty oil tank 3 and the clean oil tank 1, so that the oil in the dirty oil tank 3 is filtered by the filter assembly 2 and then input into the clean oil tank 1 to wait for use.

[0037] See also Figure 1The oil outlet of the clean oil tank 1 and the oil inlet of the dirty oil tank 3 are respectively connected to the first reversing valve 4 through the oil pipe 13. The first reversing valve 4 is installed on the base 14 and is located at the side of the clean oil tank 1 and the dirty oil tank 3. The first reversing valve 4 is provided with three oil ports, one of which is connected to the oil outlet of the clean oil tank 1 through the oil pipe 13, and one of the remaining two oil ports is connected to the oil inlet of the dirty oil tank 3 through the oil pipe 13. The remaining oil port of the first reversing valve 4 is connected to an oil port of the second oil pump 5 through the oil pipe 13. The second oil pump 5 is installed on the base 14, and the other oil port of the second oil pump 5 is connected to the oil inlet of the dirty oil tank 3 through the oil pipe 13. A second reversing valve 6 is connected, and the second reversing valve 6 is located on the base 14 at the side of the second oil pump 5. The second reversing valve 6 is also provided with three oil ports, one of which is connected to an oil port on the second oil pump 5 through an oil pipe 13, and one of the remaining two oil ports is connected to one end of a refueling pipe 10, and the other end of the refueling pipe 10 is connected to the refueling port 9 of the gearbox, and the other oil port is connected to one end of an oil extraction pipe 7, and the other end of the oil extraction pipe 7 is connected to the oil drain port 8 of the gearbox; when the gearbox is ready for factory testing, it is necessary to add oil to the gearbox, start The device is activated, the oil outlet of the clean oil tank 1 is connected to one oil port of the second oil pump 5 through the first reversing valve 4, the other oil port of the second oil pump 5 is connected to the filling pipe 10 through the second reversing valve 6, and then the second oil pump 5 is started, so that the oil in the clean oil tank 1 is discharged, flows through the first reversing valve 4, the second oil pump 5 and the second reversing valve 6 through the oil pipe 13, and then is transported to the gearbox through the filling pipe 10. After adding appropriate oil to the gearbox, the second oil pump 5 is stopped, and the gearbox refueling process of the device is realized, and the factory test of the gearbox is started; after the gearbox test is completed, the oil in the gearbox is extracted When the oil in the gearbox is turned off, the first reversing valve 4 is controlled to be reversed, and the oil inlet of the dirty oil tank 3 is connected with one oil port of the second oil pump 5. The second reversing valve 6 is controlled to be reversed, and the oil extraction pipe 7 is connected with the other oil port of the second oil pump 5. At the same time, the driving direction of the second motor 11 is switched, and the oil extraction direction of the second oil pump 5 is switched. The second oil pump 5 is started to extract the oil in the gearbox. The oil in the gearbox is extracted through the oil extraction pipe 7, passes through the second reversing valve 6, the second oil pump 5 and the first reversing valve 4 in sequence, and is gathered in the dirty oil tank 3. After the oil in the gearbox is extracted, the second oil pump 5 is stopped, so that the device extracts the oil in the gearbox;In the process of refueling and pumping oil for the gearbox, the device does not need to move the oil tank or equip additional oil barrels, thereby reducing the space occupied by the platform used for the gearbox test before leaving the factory. In addition, all parts in the device are fixed on the base 14, and the oil is always exchanged between the device and the gearbox. The oil will not be exposed to the outside, thereby ensuring that small particles in the workshop environment will not enter the oil, ensuring the safe operation of all components in the device and parts in the gearbox. At the same time, during the use of the device, the staff only needs to connect the refueling pipe 10 and the oil pumping pipe 7 to the corresponding positions on the gearbox, and control the first reversing valve 4, the second reversing valve 6 and the second oil pump 5. The oil filling and oil extraction work of the gearbox can be completed by simply using the oil filter trolley, which reduces the work of the staff to constantly exchange the two oil pipe positions on the oil filter trolley when using the oil filter trolley, thereby avoiding the spillage of oil during the oil treatment process using the oil filter trolley, and keeping the platform used for the gearbox test before delivery clean and tidy; at the same time, the clean oil tank 1 and the dirty oil tank 3 of the device are sealed as a whole. Although the clean oil tank 1 and the dirty oil tank 3 are provided with ventilation holes at the top, a breathing valve is provided in the ventilation hole for the exchange of gas inside and outside the clean oil tank 1 and the dirty oil tank 3, so that when the device is hit, the oil in the clean oil tank 1 and the dirty oil tank 3 will not spill, protecting the environment of the platform used for the gearbox test before delivery. ;

[0038] Preferably, the first reversing valve 4 and the second reversing valve 6 are both two-position three-way electromagnetic reversing valves; the second oil pump 5 is connected to a second motor 11, and the second motor 11 is a bidirectional motor. The bidirectional motor drives the second 5 to transport oil in both directions, that is, the oil in the clean oil tank 1 can be transported to the gearbox in the forward direction, and the oil in the gearbox can be pumped out to the dirty oil tank 3 in the reverse direction.

[0039] See also Figure 2 The filter assembly 2 includes an installation box 20, which is installed on the base 14. A first oil pump 21 is installed in the installation box 20. A first motor 23 is connected to the first oil pump 21. The first motor 23 is used to drive the first oil pump 21 to work. In this embodiment, the first oil pump 21 adopts a one-way oil pump. The oil outlet of the first oil pump 21 is connected to the oil inlet of the clean oil tank 1. The oil inlet of the first oil pump 21 is connected to the oil outlet of the filter part 22. The oil inlet of the filter part 22 is connected to the oil outlet of the dirty oil tank 3. The first motor 23 drives the first oil pump 21 to work, and the oil in the dirty oil tank 3 is sucked into the filter part 22 for filtering, and then the filtered oil is input into the clean oil tank 1 to wait for use, so as to achieve the filtration of the oil. The filtration is convenient, and there is no external factor affecting the oil during the filtration process, so the cleanliness of the oil is guaranteed.

[0040] See also Figure 2The filter part 22 includes a mounting sleeve 220, which is vertically mounted in the mounting box 20, and the upper end port of the mounting sleeve 220 is connected to the oil inlet of the first oil pump 21, and the lower end port of the mounting sleeve 220 is connected to the oil outlet of the dirty oil tank 3. The oil in the dirty oil tank 3 is pumped into it from the port at the lower end of the mounting sleeve 220 through the first oil pump 21, and then pumped out from the port at the upper end thereof.

[0041] A plurality of filter plates 221 are arranged along the axial direction of the mounting sleeve 220. The plurality of filter plates 221 are arranged horizontally in the mounting sleeve 220 and arranged vertically in a row. The oil entering the bottom of the mounting sleeve 220 is filtered from low to high in multiple layers. The filtering accuracy of the plurality of filter plates 221 in the mounting sleeve 220 is gradually improved from the end connected to the dirty oil tank 3 to the end connected to the first oil pump 21, thereby filtering the oil layer by layer to ensure the cleanliness of the oil input into the clean oil tank 1. Among them, the filtering accuracy of the filter plates 221 is 0.1 to 5 microns, and the filtering accuracy of the filter plates 221 arranged from low to high along the axial direction of the mounting sleeve 220 is selected as 5 microns, 2 microns, 1 micron, 0.4 microns, and 0.1 microns in sequence. Through the layer-by-layer filtering of the filter plates 221, the filtering accuracy of the oil filtration is ensured, so that the filtered oil meets the cleanliness requirements for oil use.

[0042] Preferably, a filter is provided at the oil outlet of the dirty oil tank 3, and the filter is used to preliminarily filter the oil in the dirty oil tank 3, filter out large particles in the oil, and prevent the large particles from flowing into the filter 22, which makes the filter 22 easy to be blocked. The filtering accuracy of the filter is 10 to 12 microns, and 10 microns is preferred in order to filter out most of the large particles.

[0043] See also Figure 1 , threaded joints 12 are provided on the ports of the filling pipe 10 and the oil extraction pipe 7 away from the second reversing valve 6. The filling pipe 10 can stably fix its end port away from the second reversing valve 6 to the filling port 9 of the gearbox through the threaded joint 12, and the oil extraction pipe 7 can stably fix its end port away from the second reversing valve 6 to the oil drain port 8 of the gearbox through the threaded joint 12, so as to avoid falling off during the gearbox test and affecting the gearbox test; at the same time, during the test of the gearbox before leaving the factory, after the device is connected, there is no need to disassemble the filling pipe 10 and the oil extraction pipe 7, and they can be disassembled after the gearbox test is completed.

[0044] Preferably, both the dirty oil tank 3 and the clean oil tank 1 are provided with a liquid level alarm assembly 15, which includes a warning light 150 and a limiter 151, the limiter 151 is connected to the warning light 150 signal, the limiter 151 is used to detect the height of the oil in the dirty oil tank 3 and the clean oil tank 1, when the oil in the dirty oil tank 3 and the clean oil tank 1 exceeds the specified height, the limiter 151 transmits a warning signal to the warning light 150, and the warning light 150 lights up to warn the staff to avoid the oil overflowing during the process of adding oil to the clean oil tank 1, causing oil waste. The filter assembly 2 may filter the oil in the clean oil tank 1 to its limit, and the oil may cause a pressure difference between the first oil pump 21 and the second oil pump 21, thereby damaging the first oil pump 21. At the same time, when the second oil pump 5 is transporting the oil in the gearbox to the dirty oil tank 3, the oil in the dirty oil tank 3 reaches its limit, prompting the staff to start the filter assembly 2, filter the oil in the dirty oil tank 3 and then transport it to the clean oil tank 1. The oil may cause a pressure difference between the second oil pump 5 and the second oil pump 5, thereby damaging the second oil pump 5 and protecting the safety of the operation of the device.

[0045] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0046] In addition, it should be understood that although this specification is described in accordance with the implementation methods, not every implementation method contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should take the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the utility model, and cannot be used to limit the protection scope of the utility model. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the utility model shall fall within the protection scope of the claims of the utility model.

Claims

1. A refueling device for off-line testing of a gearbox bench, characterized in that: It comprises a base (14), on which a clean oil tank (1) and a dirty oil tank (3) are arranged, and a filter assembly (2) is connected between an oil inlet of the clean oil tank (1) and an oil outlet of the dirty oil tank (3); The oil outlet of the clean oil tank (1) and the oil inlet of the dirty oil tank (3) are respectively connected to a first reversing valve (4) via an oil pipe (13); the first reversing valve (4) is connected to a second oil pump (5) via an oil pipe (13); the second oil pump (5) is connected to a second reversing valve (6); the second reversing valve (6) is respectively connected to a refueling pipe (10) and an oil extraction pipe (7); the refueling pipe (10) is used to connect to a refueling port (9) of a gearbox; the oil extraction pipe (7) is used to connect to an oil drain port (8) of a gearbox; When adding oil to the gearbox, the first reversing valve (4) conducts the oil path between the clean oil tank (1) and the second oil pump (5), and the second reversing valve (6) conducts the oil path between the filling pipe (10) and the second oil pump (5), so that oil is added to the gearbox through the second oil pump (5); when extracting oil from the gearbox, the first reversing valve (4) switches direction to conduct the oil path between the dirty oil tank (3) and the second oil pump (5), and the second reversing valve (6) switches direction to conduct the oil extraction pipe (7) and the oil path between the second oil pump (5), so that oil is extracted from the gearbox through the second oil pump (5).

2. A refueling device for gearbox off-line testing according to claim 1, characterized in that: The filter assembly (2) comprises a mounting box (20), the mounting box (20) being mounted on the base (14), a first oil pump (21) being mounted in the mounting box (20), an oil outlet of the first oil pump (21) being connected to an oil inlet of the clean oil tank (1), an oil outlet of a filter unit (22) being connected to the oil inlet of the first oil pump (21), and an oil inlet of the filter unit (22) being connected to an oil outlet of the dirty oil tank (3).

3. The refueling device for gearbox off-line test according to claim 2, characterized in that: The filter portion (22) comprises a mounting sleeve (220), one end port of the mounting sleeve (220) being connected to the oil inlet of the first oil pump (21), and the other end port of the mounting sleeve (220) being connected to the oil outlet of the dirty oil tank (3); A plurality of filter plates (221) are arranged in the installation sleeve (220) along its axial direction, and the filtering accuracy of the plurality of filter plates (221) gradually increases from the end connected to the dirty oil tank (3) to the end connected to the second oil pump (5).

4. The refueling device for gearbox off-line test according to claim 3, characterized in that: The filtering accuracy of the filter plate (221) is 0.1-5 microns.

5. The refueling device for gearbox off-line test according to claim 1, characterized in that: A filter screen is provided in the dirty oil tank (3) at the oil outlet.

6. The refueling device for gearbox off-line test according to claim 5, characterized in that: The filtering accuracy of the filter is 10-12 microns.

7. The refueling device for gearbox off-line test according to claim 1, characterized in that: A threaded joint (12) is provided on the ends of the filling pipe (10) and the oil extraction pipe (7) away from the second reversing valve (6); the threaded joint (12) connected to the filling pipe (10) is used to connect to the filling port (9) of the gearbox, and the threaded joint (12) connected to the oil extraction pipe (7) is used to connect to the oil drain port (8) of the gearbox.

8. The refueling device for gearbox off-line test according to claim 1, characterized in that: The first reversing valve (4) and the second reversing valve (6) are both two-position three-way electromagnetic reversing valves.

9. The refueling device for gearbox off-line test according to claim 1, characterized in that: The second oil pump (5) is connected to a second motor (11), and the second motor (11) is a bidirectional motor.

10. The refueling device for gearbox off-line test according to claim 1, characterized in that: The dirty oil tank (3) and the clean oil tank (1) are both provided with a liquid level alarm component (15), the liquid level alarm component (15) comprising a warning light (150) and a limiter (151), the limiter (151) being signal-connected to the warning light (150).

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