Gearbox off-line maintenance and oil pump testing device

Abstract

The application discloses a kind of gear box offline maintenance and oil pump test device, gear box includes gear box body and is located on the auxiliary pump oil supply port and oil return port of gear box body, gear box offline maintenance and oil pump test device include: first connecting pipeline, second connecting pipeline, first branch pipeline and second branch pipeline, the first end of first connecting pipeline is connected auxiliary pump oil supply port, the second end of second connecting pipeline is connected the oil return port, first branch pipeline and second branch pipeline are connected in parallel, and the second end of parallel after being connected with the first end of first connecting pipeline, the first end of parallel after being connected with the first end of second connecting pipeline, electric auxiliary pump assembly is equipped on first branch pipeline, mechanical main pump assembly is equipped on second branch pipeline.The gear box offline maintenance and oil pump test device can ensure the gear and bearing bush inside the gear box lubrication and meshing state, greatly guarantee its usability, and also can realize mechanical oil pump and electric auxiliary oil pump independent maintenance and save maintenance cost.

Description

Technical Field

[0001] The invention relates to the technical field of gear box lubrication, in particular to a gear box offline maintenance and oil pump testing device. Background Art

[0002] To ensure the safe and reliable operation of the units, Fangchenggang Nuclear Power Plant Phase I purchased a CRF circulating water pump gearbox strategic spare part. The CRF circulating water pump is the final power source of the three circuits of the nuclear power plant. If a single unit is unavailable, the unit needs to reduce power to 50%. Therefore, daily maintenance of this strategic spare part of the gearbox needs to be strengthened to ensure that it does not lose its availability due to improper maintenance.

[0003] This gearbox acts as a transmission between the motor and the pump, reducing the motor's speed from 745 rpm to the pump's speed of 179 rpm and transmitting torque, thereby achieving the pump's work. The gearbox primarily consists of a sun gear, planetary gears, a planetary carrier, a thrust shaft, an output shaft, and a combined bearing. Key components, such as gears and bearings, require regular (1M) oil spray lubrication to prevent rust. Gears and thrust bearings require regular (3M) cranking to maintain good lubrication and meshing of the planetary gears and prevent seizure or adhesion. Cranking the gearbox requires jacking up the rotor; otherwise, manual cranking is impossible. The gearbox has dimensions of φ2720mm*3240mm, lubricant viscosity is ISO VG100, and oil consumption is nearly 1600L. It is routinely stored in a dedicated spare parts warehouse. Fangchenggang, located on the coast and subject to high humidity, requires particular attention to the maintenance of critical spare parts.

[0004] In addition, the mechanical main oil pump and auxiliary oil pump of the Fangchenggang Phase I CGR gearbox supporting oil system are both imported spare parts. Replacing a mechanical main oil pump and auxiliary oil pump is very costly. Therefore, the power station carries out independent maintenance. The oil pumps after maintenance need to be re-identified, and a set of test equipment needs to be developed.

[0005] For newly purchased mechanical main oil pumps and drive motors, electric auxiliary oil pumps and drive motors, and high-pressure oil pumps and drive motors, professional engineers in power plants are usually unable to test them and can only accept them based on the documents provided by the manufacturer. This has a certain degree of uncertainty. Once the performance of the above spare parts fails to meet the on-site requirements, it will affect the operation of on-site equipment. At the same time, the best window for contacting the manufacturer will be missed, and a black box situation will exist for the guarantee of important spare parts for power plants.

[0006] After investigating other nuclear power plants in China, it was found that there is no such gearbox offline maintenance and oil pump test equipment, and there is no mature experience for reference. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a gearbox offline maintenance and oil pump testing device.

[0008] The technical solution adopted by the present invention to solve its technical problem is: constructing a gearbox offline maintenance and oil pump test device, the gearbox including a gearbox body and an auxiliary pump oil supply port and an oil return port provided on the gearbox body, the gearbox offline maintenance and oil pump test device including: a first connecting pipeline, a second connecting pipeline, a first branch pipeline and a second branch pipeline, the first end of the first connecting pipeline being connected to the auxiliary pump oil supply port, the second end of the second connecting pipeline being connected to the oil return port;

[0009] The first branch line and the second branch line are arranged in parallel, and the first end of the parallel connection is connected to the second end of the first connecting line, and the second end of the parallel connection is connected to the first end of the second connecting line;

[0010] The first branch pipeline is provided with an electric auxiliary pump assembly;

[0011] The second branch pipeline is provided with a mechanical main pump assembly.

[0012] In some embodiments, a first control valve is further provided on the first connecting pipeline;

[0013] The second connecting pipeline is provided with a first filter, a first pressure gauge, a flow meter and a second control valve;

[0014] The first branch line is also provided with a first one-way valve and a second pressure gauge;

[0015] The second branch line is also provided with a third control valve and a second one-way valve.

[0016] In some embodiments, the electric auxiliary pump assembly includes an electric auxiliary oil pump and a first drive motor connected to the electric auxiliary oil pump;

[0017] The electric auxiliary pump assembly further includes a first safety valve connected in parallel at both ends of the electric auxiliary oil pump.

[0018] In some embodiments, the mechanical main pump assembly includes a mechanical main oil pump and a second drive motor connected to the mechanical main oil pump;

[0019] The second drive motor is provided with a frequency converter.

[0020] In some embodiments, the gearbox offline maintenance and oil pump test device further comprises a third connecting pipeline, wherein a first end of the third connecting pipeline is connected to the first filter, and a second end of the third connecting pipeline is connected to a high-pressure interface provided on the gearbox;

[0021] The third connecting pipeline is provided with a fourth control valve, a high-pressure pump assembly, a third one-way valve, a second filter, a fifth control valve and a third pressure gauge;

[0022] The high-pressure pump assembly includes a high-pressure pump and a third drive motor connected to the high-pressure pump.

[0023] In some embodiments, the gearbox offline maintenance and oil pump test device further includes a fourth connecting pipeline and an oil tank, and the fourth connecting pipeline includes a third branch pipeline and a fourth branch pipeline;

[0024] The first end of the third branch line is connected to the first filter, and the second end is connected to the oil tank. The third branch line is also provided with a second safety valve;

[0025] The first end of the fourth branch line is connected to a section of the third connecting line between the third one-way valve and the second filter, and the second end is connected to the oil tank. A third safety valve is also provided on the fourth branch line.

[0026] In some embodiments, the fuel tank is provided with a liquid level gauge and an air filter.

[0027] In some embodiments, the gearbox offline maintenance and oil pump test device further comprises a fifth connecting line, a first end of the fifth connecting line being connected to a section of the third connecting line between the first filter and the flow meter;

[0028] An oil drain ball valve is provided on the fifth connecting pipeline.

[0029] In some embodiments, the electric auxiliary oil pump is a repaired and refurbished electric auxiliary oil pump;

[0030] And / or, the mechanical main oil pump is a repaired and refurbished mechanical main oil pump.

[0031] In some embodiments, the electric auxiliary pump assembly includes an electric auxiliary oil pump and a first drive motor connected to the electric auxiliary oil pump;

[0032] The electric auxiliary pump assembly further includes a first safety valve connected in parallel at both ends of the electric auxiliary oil pump.

[0033] The implementation of the present invention has the following beneficial effects: the gearbox, as a strategic spare part, is of great significance for ensuring the safe, stable operation and economy of the power station. The design of the gearbox offline maintenance and oil pump test device can ensure the lubrication and meshing status of the gears and bearings inside the gearbox, greatly ensuring its availability. In addition, in order to achieve independent maintenance of the mechanical oil pump and the electric auxiliary oil pump and save maintenance costs, the designed gearbox offline maintenance and oil pump test device can test the refurbished oil pump to ensure that both can be used on site at any time. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solution of the present invention, the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can derive other relevant drawings based on these drawings without inventive effort. In the drawings:

[0035] Figure 1 is a schematic diagram of a main pipeline of a gearbox offline maintenance and oil pump test device in some embodiments of the present invention;

[0036] Figure 2 is a schematic diagram of a lubrication circuit in some embodiments of the present invention;

[0037] Figure 3 is a schematic diagram of a high-voltage circuit in some embodiments of the present invention;

[0038] Figure 4 is a schematic diagram of a fourth pipeline of a gearbox offline maintenance and oil pump test device in some embodiments of the present invention;

[0039] Figure 5 It is a schematic diagram of the three-dimensional structure of the gearbox offline maintenance and oil pump test device in some embodiments of the present invention. DETAILED DESCRIPTION

[0040] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings and are constructed and operated in specific directions. They are only for the convenience of describing the technical solution and do not indicate that the devices or components referred to must have specific directions. Therefore, they should not be understood as limiting the present invention.

[0041] It should also be noted that, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected", "fixed", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intervening elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0042] See also Figures 1 to 5 , is a gearbox offline maintenance and oil pump test device in some embodiments of the present invention. The gearbox 1 includes a gearbox body 11 and an auxiliary pump oil supply port 12 and an oil return port 13 provided on the gearbox body 11. Furthermore, the gearbox 1 is mainly composed of components such as a sun gear, planetary gears, a planetary carrier, a thrust shaft, an output shaft and a combined bearing.

[0043] The gearbox offline maintenance and oil pump test device includes: a first connecting pipeline 2, a second connecting pipeline 3, a first branch pipeline 4 and a second branch pipeline 5. The first end of the first connecting pipeline 2 is connected to the auxiliary pump oil supply port 12, and the second end of the second connecting pipeline 3 is connected to the oil return port 13.

[0044] The first branch pipeline 4 and the second branch pipeline 5 are arranged in parallel, and the first end after parallel connection is connected to the second end of the first connecting pipeline 2, and the second end after parallel connection is connected to the first end of the second connecting pipeline 3. The first branch pipeline 4 is provided with an electric auxiliary pump assembly 41, and the second branch pipeline 5 is provided with a mechanical main pump assembly 51.

[0045] As can be understood, the first connecting line 2, the second connecting line 3, the first branch line 4, and the second branch line 5 collectively form a lubrication circuit for lubricating the gearbox 1. The lubricating oil returns to the oil distributor of the gearbox 1 through this lubrication circuit. The oil distributor then sprays the lubricating oil onto components such as the gears and guide bushes, maintaining good lubrication and meshing of the planetary gears. The first branch line 4 can be used for requalification testing of the electric auxiliary oil pump 411, and the second branch line 5 can be used for requalification testing of the mechanical main oil pump 511.

[0046] In some embodiments, the first connecting pipeline 2 is further provided with a first control valve 21, the second connecting pipeline 3 is provided with a first filter 31, a first pressure gauge 32, a flow meter 33 and a second control valve 34, the first branch line 4 is further provided with a first one-way valve 42 and a second pressure gauge 43, and the second branch line 5 is further provided with a third control valve 52 and a second one-way valve 53.

[0047] It can be understood that the first control valve 21 can be a DN80PN16 hydraulic ball valve, which is used to control the pressure and flow of the first connecting pipeline 2.

[0048] The first filter 31 can be a duplex filter, and the specifications of the duplex filter are preferably 1300 L / min, 25 μm. The duplex filter is used to intercept various impurities such as abrasive particles generated by the hydraulic components on the first connecting pipeline 2, the first branch pipeline 4 and the second branch pipeline 5 during operation. In some other embodiments, the first filter 31 can also be a single-cylinder filter or other forms of filters, which are not specifically limited here.

[0049] The first pressure gauge 32 is used to measure the flow pressure on the second connecting pipeline 3 , and the first pressure gauge 32 may be a 1.6-level 100-1 MPa pressure gauge.

[0050] The flowmeter 33 can be a turbine flowmeter 33, preferably a digital DN80 turbine flowmeter, and is used to measure the flow rate in the second connecting pipeline 3. In other embodiments, the flowmeter 33 can also be an ultrasonic flowmeter, a differential pressure flowmeter, a rotor flowmeter, or a throttling flowmeter, which are not specifically limited here. The second control valve 34 can be a DN80PN16 hydraulic ball valve, which is used to control the pressure and flow of the second connecting pipeline 3.

[0051] Furthermore, the first check valve 42 can be a DN80 check valve, which allows lubricating oil to flow through the first branch line 4 only in the direction toward the first filter 31. The second pressure gauge 43 can be a 1.6-level 100-1 MPa pressure gauge, which is used to measure the flow pressure in the first branch line 4. The third control valve 52 can be a DN80PN16 hydraulic ball valve, which is used to control the pressure and flow of the second branch line 5. The second check valve 53 can be a DN80 check valve, which allows lubricating oil to flow through the second branch line 5 only in the direction toward the first filter 31.

[0052] In some embodiments, the electric auxiliary pump assembly 41 includes an electric auxiliary oil pump 411 and a first drive motor 412 connected to the electric auxiliary oil pump 411 . The electric auxiliary pump assembly 41 also includes a first safety valve 413 connected in parallel at both ends of the electric auxiliary oil pump 411 .

[0053] It is understood that the electric auxiliary oil pump 411 can be an original component fixed to the side of the gearbox. The electric auxiliary oil pump 411 may be equipped with a pressure relief valve to protect the electric auxiliary oil pump 411. The electric auxiliary oil pump 411 is used to provide pressurized oil for offline maintenance of the gearbox and oil pump testing equipment when the unit or main oil pump fails. The design flow rate of the electric auxiliary oil pump 411 is preferably 350L / min. Furthermore, the first drive motor 412 is connected to the electric auxiliary oil pump 411 via an elastic coupling and is used to provide power to the electric auxiliary oil pump 411. The specifications of the first drive motor 412 are preferably 11kW, AC380V, and 1450r / min. The first safety valve 413 is used to provide safety protection for the electric auxiliary oil pump 411. The electric auxiliary oil pump 411 can be a brand new electric auxiliary oil pump 411 or a refurbished electric auxiliary oil pump 411 , that is, the refurbished electric auxiliary oil pump 411 is installed on the first branch pipeline 4 to detect whether the refurbished electric auxiliary oil pump 411 meets the requirements.

[0054] In some embodiments, the mechanical main pump assembly 51 includes a mechanical main oil pump 511 and a second drive motor 512 connected to the mechanical main oil pump 511. The second drive motor 512 is equipped with a frequency converter. It is understood that the mechanical main oil pump 511 has the characteristics of high flow rate, low outlet pressure head, and stable oil pressure, ensuring stable oil supply to the gearbox offline maintenance and oil pump testing device under different operating conditions. The design flow rate of the mechanical main oil pump 511 can preferably be 400 L / min. Furthermore, the inlet pipe of the mechanical main oil pump 511 can be DN100, and the outlet pipe can be DN80. The mechanical main oil pump 511 and the inlet and outlet pipes can be welded or flanged. The second drive motor 512 is connected to the mechanical main oil pump 511 via an elastic coupling, which is used to provide power to the mechanical main oil pump 511. The specifications of the second drive motor 512 are preferably 7.5kW, AC380V, and 1450r / min. Preferably, since the mechanical main oil pump 511 is driven by gear meshing and its speed is not a normal motor speed, the second drive motor 512 can be equipped with a frequency converter, and the specification of the frequency converter is preferably 11kW.

[0055] The electric auxiliary oil pump 411 is a refurbished electric auxiliary oil pump 411, and / or the mechanical main oil pump 511 is a refurbished mechanical main oil pump 511. It is understood that both the electric auxiliary oil pump 411 and the mechanical main oil pump 511 are drawn from the gearbox oil pump oil supply port. The mechanical main oil pump 511 can be a brand new mechanical main oil pump 511 or a refurbished mechanical main oil pump 511. That is, the refurbished mechanical main oil pump 511 is installed on the second branch pipeline 5 to test whether the refurbished mechanical main oil pump 511 meets the requirements.

[0056] See also Figure 3 In some embodiments, the gearbox offline maintenance and oil pump test device further includes a high-pressure circuit.

[0057] The first end of the third connecting line 6 is connected to the first filter 31, and the second end is connected to the high-pressure port 14 on the gearbox. The third connecting line 6 is equipped with a fourth control valve 61, a high-pressure pump assembly 62, a third one-way valve 63, a second filter 64, a fifth control valve 65, and a third pressure gauge 66. The high-pressure pump assembly 62 includes a high-pressure pump 621 and a third drive motor 622 connected to the high-pressure pump 621. It can be understood that the third connecting line 6, together with the first connecting line 2, the first branch line 4, and the second branch line 5, forms the high-pressure circuit described above, which is used to supply oil to the gearbox thrust washer, thereby achieving the function of jacking up the gearbox rotor. Preferably, the third connecting line uses a 12mm DN10 stainless steel 316 pipe ferrule for connection, a 28mm steel pipe for connection to the other connecting lines, and a 3 / 8 high-pressure hose for connection to the high-pressure port 14.

[0058] Among them, the fourth control valve 61 can be a DN20 hydraulic ball valve, which is used to control the pressure and flow of the third connecting pipeline 6. The third one-way valve 63 can be a DN10 one-way valve, which allows the lubricating oil on the third branch line 71 to flow only in the direction toward the high-pressure interface 14. The second filter 64 is used to intercept various impurities such as abrasive particles generated during the operation of the hydraulic components on the third connecting pipeline 6. The specifications of the second filter 64 can preferably be 40L / min, 10μm. The fifth control valve 65 can be a DN20 hydraulic ball valve, which is used to control the pressure and flow of the third connecting pipeline 6. The third pressure gauge 66 can be a 1.6-level 60-25MPa pressure gauge, which is used to measure the flow pressure on the third connecting pipeline 6.

[0059] The high-pressure pump 621 is used to increase the pressure of the lubricating oil to a value sufficient to lift the gearbox rotor. The design flow rate of the high-pressure pump 621 is preferably 10 L / min. The third drive motor 622 is connected to the high-pressure pump 621 via an elastic coupling and is used to provide power to the high-pressure pump 621. The specifications of the third drive motor 622 are preferably 11 kW, AC380V, and 1450 r / min.

[0060] See also Figure 4 In some embodiments, the gearbox offline maintenance and oil pump test device also includes a fourth connecting pipeline 7 and an oil tank 8. The fourth connecting pipeline 7 includes a third branch pipeline 71 and a fourth branch pipeline 72. The first end of the third branch pipeline 71 is connected to the first filter 31, and the second end is connected to the oil tank 8. The third branch pipeline 71 is also provided with a second safety valve 711. The first end of the fourth branch pipeline 72 is connected to a section of the third connecting pipeline 6 between the third one-way valve 63 and the second filter 64, and the second end is connected to the oil tank 8. The fourth branch pipeline 72 is also provided with a third safety valve 721.

[0061] It can be understood that the fourth connecting line 7 is used to drain the lubricating oil discharged from the first filter 31 and the high-pressure pump 621 into the oil tank 8. The oil tank 8 is used to recover the lubricating oil passing through the fourth connecting line 7. The specification of the oil tank 8 can preferably be 100L. Furthermore, the oil tank 8 can be made of 2.5mm thick 304 stainless steel plate by bending and welding, and is fixed to the base with screws, which greatly enhances the rigidity and strength of the oil tank 8, allowing it to operate stably.

[0062] The second safety valve 711 may preferably have a pressure of 0.45 MPa, which is used to provide safety protection for the third branch pipeline 71 . The third safety valve 721 may preferably have a pressure of 20 MPa, which is used to provide safety protection for the fourth branch pipeline 72 .

[0063] In some embodiments, the fuel tank 8 is provided with a level gauge 81 and an air filter 82. The level gauge 81 is used to measure the level of the lubricating oil in the fuel tank, and the air filter 82 filters out particles and impurities in the air entering the fuel tank 8 to ensure that the air entering the fuel tank 8 is clean.

[0064] In some embodiments, the gearbox offline maintenance and oil pump test device further includes a fifth connecting line 9 . The first end of the fifth connecting line 9 is connected to a section of the third connecting line 6 between the first filter 31 and the flowmeter 33 . A drain ball valve 91 is provided on the fifth connecting line 9 . As will be appreciated, the fifth connecting line 9 is used to drain a portion of the lubricating oil discharged from the first filter 31 out of the gearbox offline maintenance and oil pump test device. The drain ball valve 91 , which may be a DN80PN16 hydraulic ball valve, is used to control the pressure and flow rate of the fifth connecting line 9 .

[0065] See also Figure 5 In some embodiments, the gearbox offline maintenance and oil pump test device further includes a frame 10, on which an oil receiving pan 101 is provided. Preferably, the frame 10 is welded using 10# channel steel to enhance the stability, rigidity, and strength of the gearbox offline maintenance and oil pump test device. The oil receiving pan 101 is used to store lubricating oil leaked from components to prevent hydraulic oil leakage and environmental pollution. The oil receiving pan 101 can be made of 2mm thick cold-rolled sheet metal by bending and welding, and the surface is rust-removed and painted blue, which enhances the strength and rigidity of the oil receiving pan 101, and has rust and corrosion-resistant functions, thereby increasing the service life of the oil receiving pan 101.

[0066] In some embodiments, the gearbox offline maintenance and oil pump test device further includes a control box 102, which can control the start and stop of the first drive motor 412, the second drive motor 512, and the third drive motor 622. Furthermore, the control box 102 can also control a heating device within the gearbox 1 to heat the gearbox 1. The gearbox offline maintenance and oil pump test device also includes a sensor that matches the power of the heating device. In other embodiments, the heating device and sensor may not be included if the ambient temperature is not too low.

[0067] As can be understood, gearbox 1, as a strategic spare part, is of great significance for ensuring the safe, stable operation and economic efficiency of the power plant. The design of this gearbox offline maintenance and oil pump test device ensures the lubrication and meshing of the gears and bearings within the gearbox, greatly ensuring its availability. Furthermore, to enable independent maintenance of the mechanical oil pump and electric auxiliary oil pump and save maintenance costs, the designed gearbox offline maintenance and oil pump test device can test refurbished oil pumps (the replacement cost of a single pump is 400,000 yuan, while the cost of the spare part after independent repair is only 20,000 yuan), ensuring that both are ready for on-site use at any time. Furthermore, this gearbox offline maintenance and oil pump test device, as a maintenance strategy for critical spare parts, can be extended to Fangchenggang Phase II and other power plants.

[0068] It can be understood that the above embodiments only express the preferred implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A gearbox offline maintenance and oil pump test device, wherein the gearbox (1) comprises a gearbox body (11) and an auxiliary pump oil supply port (12) and an oil return port (13) provided on the gearbox body (11), characterized in that: The gearbox offline maintenance and oil pump test device comprises: a first connecting pipeline (2), a second connecting pipeline (3), a first branch pipeline (4) and a second branch pipeline (5), wherein the first end of the first connecting pipeline (2) is connected to the auxiliary pump oil supply port (12), and the second end of the second connecting pipeline (3) is connected to the oil return port (13); The first branch line (4) and the second branch line (5) are arranged in parallel, and the first end of the parallel connection is connected to the second end of the first connecting line (2), and the second end of the parallel connection is connected to the first end of the second connecting line (3); The first branch pipeline (4) is provided with an electric auxiliary pump assembly (41); The second branch pipeline (5) is provided with a mechanical main pump assembly (51); The second connecting pipeline (3) is provided with a first filter (31); The gearbox offline maintenance and oil pump test device further comprises a third connecting pipeline (6), a first end of the third connecting pipeline (6) being connected to the first filter (31) and a second end being connected to a high-pressure interface (14) provided on the gearbox (1).

2. The gearbox offline maintenance and oil pump testing device according to claim 1, characterized in that: The first connecting pipeline (2) is further provided with a first control valve (21); The second connecting pipeline (3) is provided with a first pressure gauge (32), a flow meter (33) and a second control valve (34); The first branch line (4) is further provided with a first one-way valve (42) and a second pressure gauge (43); The second branch pipeline (5) is also provided with a third control valve (52) and a second one-way valve (53).

3. The gearbox offline maintenance and oil pump testing device according to claim 2, characterized in that: The electric auxiliary pump assembly (41) comprises an electric auxiliary oil pump (411) and a first drive motor (412) connected to the electric auxiliary oil pump (411); The electric auxiliary pump assembly (41) further includes a first safety valve (413) connected in parallel to both ends of the electric auxiliary oil pump (411).

4. The gearbox offline maintenance and oil pump testing device according to claim 3, characterized in that: The mechanical main pump assembly (51) comprises a mechanical main oil pump (511) and a second drive motor (512) connected to the mechanical main oil pump (511); The second drive motor (512) is provided with a frequency converter.

5. The gearbox offline maintenance and oil pump testing device according to claim 4, characterized in that: The third connecting pipeline (6) is provided with a fourth control valve (61), a high-pressure pump assembly (62), a third one-way valve (63), a second filter (64), a fifth control valve (65), and a third pressure gauge (66); The high-pressure pump assembly (62) comprises a high-pressure pump (621) and a third drive motor (622) connected to the high-pressure pump (621).

6. The gearbox offline maintenance and oil pump testing device according to claim 5, characterized in that: The gearbox offline maintenance and oil pump test device further comprises a fourth connecting pipeline (7) and an oil tank (8), wherein the fourth connecting pipeline (7) comprises a third branch pipeline (71) and a fourth branch pipeline (72); The first end of the third branch line (71) is connected to the first filter (31), and the second end is connected to the oil tank (8). The third branch line (71) is also provided with a second safety valve (711); The first end of the fourth branch line (72) is connected to a section of the third connecting line (6) between the third one-way valve (63) and the second filter (64), and the second end is connected to the oil tank (8). The fourth branch line (72) is also provided with a third safety valve (721).

7. The gearbox offline maintenance and oil pump testing device according to claim 6, characterized in that: The oil tank (8) is provided with a liquid level gauge (81) and an air filter (82).

8. The gearbox offline maintenance and oil pump testing device according to claim 7, characterized in that: The gearbox offline maintenance and oil pump test device further comprises a fifth connecting pipeline (9), a first end of the fifth connecting pipeline (9) being connected to a section of the third connecting pipeline (6) located between the first filter (31) and the flow meter (33); The fifth connecting pipeline (9) is provided with an oil drain ball valve (91).

9. The gearbox offline maintenance and oil pump testing device according to claim 4, characterized in that: The electric auxiliary oil pump (411) is a repaired and refurbished electric auxiliary oil pump (411); And / or, the mechanical main oil pump (511) is a repaired and refurbished mechanical main oil pump (511).

10. The gearbox offline maintenance and oil pump testing device according to any one of claims 1 to 9, characterized in that: The gearbox offline maintenance and oil pump test device further comprises a frame (10), on which an oil receiving pan (101) is provided.

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