Hydraulic travel motor oil port connecting piece, oil pumping and injecting system and oil pumping and injecting method

Abstract

The invention belongs to the field of hydraulic travel motor testing, and particularly discloses a hydraulic travel motor oil port connecting piece, an oil pumping and injecting system and an oil pumping and injecting method.The hydraulic travel motor oil port connecting piece comprises a first connector, a second connector, a third connector and an internal connecting pipe, and an independent gas channel and an independent oil channel are formed; the functions of exhausting during oil injection and air inlet during oil pumping are achieved through the double-oil-port design, and the oil pumping and injection efficiency is improved. The oil pumping and injecting system comprises an oil tank, an oil source, a gas source, a gas triple piece, a vacuum generator, an oil collecting tank, a filter, a flow meter, a program control unit and the like, and efficient and accurate oil pumping and injecting of an inner cavity of the hydraulic walking motor are achieved through automatic control. According to the oil pumping and injecting method, automatic operation of oil injection and oil pumping is achieved through control signals of the program control unit, manual intervention is reduced, and the test process is optimized. The problems that in the prior art, a single-leakage oil port of a hydraulic walking motor is low in oil pumping and injecting efficiency and poor in reliability are solved, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of hydraulic travel motor testing, and in particular to an oil port connector, an oil extraction and injection system and an oil extraction and injection method for a hydraulic travel motor. Background Art

[0002] A hydraulic travel motor is a device that converts the liquid pressure energy provided by a hydraulic pump into mechanical energy (torque and speed). Its main components include a housing, a swash plate, a plunger, a friction plate, a bearing and an output shaft. This type of mechanism design makes full use of the principles of fluid mechanics to achieve efficient energy conversion.

[0003] In order to ensure the product quality of hydraulic travel motors, strict factory tests must be carried out before delivery. However, due to the hydraulic motor plunger clearance and lubrication requirements, oil needs to be added to the hydraulic motor through the oil filling port or leakage port before the test, and the oil in the hydraulic motor cavity needs to be discharged after the test. The internal cavity of the hydraulic travel motor is connected to the external environment only through a single leakage port, which makes the cavity relatively closed during the oil extraction process, and it is difficult for the oil to flow naturally. Therefore, air needs to be discharged when filling the oil, and air needs to be injected when pumping the oil to ensure smooth flow of the oil.

[0004] At present, the conventional vacuum oil filling method is: before the test, manually add oil to the leaking oil port; after the test, control the oil of the hydraulic travel motor. However, this method has many problems: the time for oil filling and oil draining is long, the operation process is complicated, the work efficiency is low, and the overall test rhythm is seriously affected.

[0005] In view of the above problems, the existing technical solutions have obvious limitations and are difficult to meet the needs of efficient and convenient testing. Therefore, there is an urgent need for a new technical solution that can realize an automatic and quantitative oil filling process and is equipped with corresponding oil port connectors to replace the traditional single leakage oil port motor oil extraction solution, thereby improving work efficiency and optimizing the test process. Summary of the invention

[0006] The purpose of the present invention is to provide a hydraulic travel motor oil port connector, an oil extraction and injection system and an oil extraction and injection method to solve the technical problems of low efficiency and poor reliability of oil extraction and injection of a single leakage oil port in the inner cavity of a hydraulic travel motor in the prior art.

[0007] To achieve the above-mentioned purpose, in one aspect, the present invention provides a hydraulic travel motor oil port connector, including a first connector, a second connector, a third connector and an internal connecting pipe; the first connector is connected to the second connector to form a gas channel, the internal connecting pipe runs through the first connector and the second connector, and is connected to the third connector to form an oil channel, an air port of the gas channel and an oil port of the oil channel are both arranged at one end of the second connector, for connecting to the leakage oil port of the hydraulic travel motor.

[0008] Optionally, one end of the first connector is a nut end for connecting to an external ventilation pipe, and the other end is provided with an annular groove, and the interior is hollow to form a hollow cavity as a part of the gas channel; one end of the second connector is a nut end for connecting to the leakage oil port of the hydraulic travel motor under test, and the other end is provided with an annular groove, which is aligned with and connected to the annular groove of the first connector, and the interior is hollow to form a circular ring cavity between the internal connecting pipe as a part of the gas channel; one end of the third connector is a nut end for connecting to the oil extraction and injection system, and the other end is connected to the internal connecting pipe.

[0009] Optionally, the first connecting head and the second connecting head are connected by welding.

[0010] Optionally, one end of the internal connecting tube is connected to the third connecting head, and the other end penetrates into the second connecting head and extends in the same direction until it protrudes from the nut end of the second connecting head.

[0011] Optionally, the length of the internal connecting tube extending out of the nut end of the second connecting head is ≥20 mm.

[0012] Optionally, the internal connecting pipe enters vertically from a welding position of the first connecting head and the second connecting head.

[0013] In another aspect, the present invention further provides an oil extraction and injection system, using any of the above-mentioned hydraulic travel motor oil port connectors, the oil extraction and injection system comprising:

[0014] The oil tank stores oil and is equipped with a level and temperature gauge, an oil drain ball valve, a temperature sensor, an air filter and a level sensor;

[0015] The oil source and the gas source provide oil and compressed air respectively;

[0016] Gas triplex, regulating gas source pressure and filtering impurities;

[0017] A vacuum generator, which is discharged into the atmosphere through a muffler, is used for vacuuming operations;

[0018] The oil collecting tank is connected to the oil tank through a one-way valve to receive the oil under the pumping condition and compress the air to drive the oil to flow back when discharging the oil;

[0019] Flow meter, to monitor the oil injection flow;

[0020] Several angle seat valves and reversing valves to control the on / off and flow direction of oil and gas;

[0021] Program control unit.

[0022] Optionally, the oil tank is connected to double air pipes, and the two air pipes respectively have an air pipe connecting end 1 and an air pipe connecting end 2; the oil tank is connected to double oil pipes, and the two oil pipes respectively have an oil pipe connecting end 1 and an oil pipe connecting end 2.

[0023] Optionally, the program control unit includes a vacuum control module, a vacuum oil extraction control module, an oil injection control module and an oil collection tank oil discharge control module.

[0024] On the other hand, the present invention further provides an oil extraction and injection method, using the oil extraction and injection system described in any one of the above items, the oil extraction and injection method includes an oil injection operation and an oil extraction operation; the oil injection operation includes: before the hydraulic travel motor test, the program control unit generates a first control signal to start the oil filling operation on the hydraulic travel motor cavity, an oil port is used to discharge the air in the hydraulic travel motor cavity, when the flow rate of the filling oil reaches a predetermined value, the program control unit generates a second control signal to stop the oil filling operation; the oil extraction operation includes: after the hydraulic travel motor test is completed, the program control unit generates a third control signal to ensure that the oil collecting tank produces a vacuum environment, when the vacuum degree of the oil collecting tank reaches a preset value, the program control unit generates a fourth control signal to start the oil extraction operation through the oil port connector, after the oil extraction is completed, the program control unit generates a fifth control signal to introduce compressed air into the oil collecting tank, so that the oil in the oil collecting tank is discharged into the oil tank, when the pressure value of the oil collecting tank reaches a preset value, the program control unit generates a sixth control signal to end the oil discharge operation of the oil collecting tank.

[0025] Compared with the prior art, the present invention at least discloses the following beneficial effects:

[0026] The technical solution of the present invention can expand the single leakage oil port of the hydraulic travel motor into a double oil port, solving the problem that gas cannot be discharged when the single leakage oil port is used for hydraulic oil injection and air cannot be taken in when the single leakage oil port is used for oil discharge, reducing manual operation and oil discharge time, and improving the efficiency of oil extraction and injection in the inner cavity of the hydraulic travel motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is a schematic structural diagram of a hydraulic travel motor oil port connector according to Embodiment 1 of the present invention;

[0029] Figure 2 It is a cross-sectional view of the oil port connector of the hydraulic travel motor according to Embodiment 1 of the present invention;

[0030] Figure 3 The structure and principle diagram of the oil extraction and injection system of Example 2 of the present invention;

[0031] Figure 4 This is a functional block diagram of a program control unit in the oil extraction and injection system of Example 2 of the present invention.

[0032] In the figure: 1. first connector; 2. second connector; 3. third connector; 4. internal connecting pipe; 5. oil channel; 6. oil port 1; 7. oil port 2; 8. gas channel; 9. gas port 1; 10. gas port 2; 11. oil tank; 12. liquid level and temperature gauge; 13. oil drain ball valve; 14. temperature sensor; 15. air filter; 16. liquid level sensor; 17. oil source; 18. gas source; 19. gas triplex; 20. vacuum generator; 21. muffler; 22. vacuum detector; 23. refueling valve; 24. one-way valve; 25. oil collecting tank; 26. filter; 27. flow Meter; 28, program control unit; 29, vacuum control module; 30, vacuum oil extraction control module; 31, oil injection control module; 32, oil collection tank oil discharge control module; 201, angle seat valve one; 202, angle seat valve two; 203, angle seat valve three; 204, angle seat valve four; 205, angle seat valve five; 206, angle seat valve six; 207, angle seat valve seven; 208, angle seat valve eight; 209, angle seat valve nine; 210, angle seat valve ten; 211, angle seat valve eleven; 301, oil pipe connection end one; 302, oil pipe connection end two; 401, air pipe connection end one; 402, air pipe connection end two. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Embodiment 1:

[0036] Reference Figure 1 and Figure 2 As shown, embodiment 1 of the present invention provides a hydraulic travel motor oil port connector, including a first connector 1, a second connector 2, a third connector 3 and an internal connecting pipe 4.

[0037] Specifically, one end of the first joint is a nut end for connecting to an external ventilation pipe, and the other end is provided with an annular groove. The interior of the first joint is hollow to form a hollow cavity as a part of the gas channel 8.

[0038] One end of the second connector is a nut end, which is used to connect the leakage oil port of the tested hydraulic travel motor, and the other end is also provided with an annular groove, which is aligned with the annular groove of the first connector 1. The second connector is hollow inside and an internal connecting pipe 4 coaxial with it is inserted in the hollow cavity, and a circular ring cavity is formed between the second connector and the internal connecting pipe 4 for ventilation. The circular ring cavity also serves as a part of the gas channel 8.

[0039] The first connector 1 and the second connector 2 are welded together at one end with an annular groove, one end of the gas channel 8 is arranged at the nut end of the first connector 1 to form a gas port 1 9, and the other end of the gas channel 8 is arranged at the nut end of the second connector 2 to form a gas port 2 10. The gas port 1 9 is connected to an external ventilation pipe, and a stop valve can be arranged on the external ventilation pipe.

[0040] One end of the internal connecting tube 4 extends from the nut end of the second connector 2, that is, from the gas port 2 10, and the extension length is ≥ 20 mm, and the other end of the internal connecting tube 4 extends vertically from the welding position of the first connector 1 and the second connector 2, and is connected to the third connector 3 at the extended end. It should be understood that the internal connecting tube 4 can also be understood as vertically entering from the welding position of the first connector 1 and the second connector 2 and bending to one side of the second connector 2, and being concentrically arranged with the second connector 2.

[0041] The third connector 3 is hollow inside, one end of which is connected to the internal connecting pipe 4, and is connected with the inner cavity of the internal connecting pipe 4 to form an oil channel 5 for conveying hydraulic oil. The other end of the third connector 3 is a nut end, which is used to connect the oil extraction and injection system. One end of the oil channel 5 is arranged at the nut end of the third connector 3, forming an oil port 1 6, and the other end is arranged at one end of the internal connecting pipe 4 extending out of the nut end of the second connector 2, forming an oil port 2 7.

[0042] The internal connecting tube 4 is an L-shaped or quasi-L-shaped bent tube, which passes through the first connector 1 and the second connector 2 and is connected to the third connector 3. One end of the internal connecting tube 4 extends about 20 mm outside the nut end of the second connector 2, and the other end is welded to the third connector 3. The bent portion is welded and fixed to the annular groove.

[0043] The hydraulic travel motor oil port connector of the above structure includes a gas channel 8 and an oil channel 5, and one port of the gas channel 8 and the oil channel 5 are both arranged at the nut end of the second connector 2, which can be simultaneously connected to the leakage oil port of the tested hydraulic travel motor.

[0044] When the hydraulic travel motor oil port connector of this embodiment is in use, the nut end of the second connector 2 is screwed into the leakage oil port of the tested hydraulic travel motor, the nut end of the first connector 1 is connected to the external ventilation pipe, and is connected to the oil tank 11 through the external ventilation pipe, which is used to return the gas in the inner cavity of the tested hydraulic travel motor to the oil tank 11 through the external ventilation pipe, and the nut end of the third connector 3 is connected to the oil extraction and injection system. Taking oil injection as an example, the hydraulic oil enters the inner cavity of the internal connecting pipe 4 through the third connector 3, and is transported to the target oil port through the oil channel 5; at the same time, the gas enters the gas channel 8 through the gas port 10 at the nut end of the second connector 2, and is discharged or circulated through the gas channel 8. The two channels operate independently without interfering with each other, ensuring that the gas channel 8 is physically isolated from the oil channel 5, avoiding medium mixing, and effectively ensuring system reliability.

[0045] In the embodiment, during the process of pumping and filling oil, the flow of oil in the oil port connector of the hydraulic travel motor is divided into an oil filling condition and an oil pumping condition.

[0046] Oil filling conditions:

[0047] During oil filling, the oil enters the cavity of the hydraulic travel motor through an oil port (specifically the third connector 3) of the hydraulic travel motor oil port connector. At this time, the air in the cavity of the hydraulic travel motor needs to be discharged to avoid the formation of a dead cavity in the cavity of the hydraulic travel motor, which affects the oil filling effect. The air is discharged through the gas channel 8 of the oil port connector (specifically the inner cavity of the first connector 1 and the second connector 2). This process is achieved by utilizing the pressure of the oil and the natural flow characteristics of the air. When the oil enters the internal cavity of the hydraulic travel motor, it will gradually compress the air in the cavity and push it toward the exhaust port, and finally be discharged through the exhaust port.

[0048] Specifically, the air exhaust path is: the air in the hydraulic travel motor cavity enters the annular cavity formed by the second connector 2 and the internal connecting tube 4, then enters the inner cavity of the first connector 1 from the annular cavity, and then is exhausted into the atmosphere through the nut end of the first connector 1. This design ensures that the air in the hydraulic travel motor cavity can be discharged smoothly during the oil filling process, avoiding the problem of insufficient oil filling or difficulty in oil filling due to residual air.

[0049] Pumping conditions:

[0050] When pumping oil, in order to smoothly pump out the oil in the cavity, a certain negative pressure needs to be formed in the cavity. At the same time, in order to avoid the formation of a vacuum in the cavity that makes it difficult to pump oil, air needs to be introduced through the oil port. The air enters the cavity of the hydraulic travel motor through the gas channel 8 of the hydraulic travel motor oil port connector, providing the necessary pressure difference for the extraction of oil. This process is achieved through the coordinated work of the hydraulic travel motor oil port connector and the oil pumping system.

[0051] Specifically, the air enters the annular cavity formed by the second connector 2 and the internal connecting tube 4 from the first connector 1, and then enters the cavity of the hydraulic travel motor from the annular cavity. This design ensures that during the oil pumping process, the hydraulic travel motor cavity can be replenished with air in time to maintain an appropriate pressure difference, thereby achieving efficient oil pumping.

[0052] The hydraulic travel motor oil port connector of Example 1 of the present invention expands the single leakage oil port of the hydraulic travel motor into double oil ports, thereby realizing the functions of one oil port for oil intake and the other oil port for exhaust during oil filling, and one oil port for oil extraction and the other oil port for air intake during oil pumping, thereby improving the efficiency of oil extraction and injection and reducing manual operations.

[0053] It should be understood that, in actual applications, the first connector 1 and the second connector 2 do not necessarily have to be connected by welding, but can be integrally formed; the third connector 3 and the internal connecting tube 4 do not necessarily have to be connected by welding, but can also adopt a detachable connection method, such as a threaded connection, and a rubber sealing ring is provided at the connection to facilitate disassembly and cleaning.

[0054] It should also be understood that, in actual use, the end of the internal connecting pipe 4 extending out of the second connecting head 2 can be connected to other oil pumping pipes as needed.

[0055] Embodiment 2:

[0056] Reference Figure 3 and Figure 4As shown, Embodiment 2 of the present invention provides an oil extraction system for efficient extraction of oil from the inner cavity of a hydraulic travel motor, and its core structure includes an oil tank 11, an oil source 17, an air source 18, a gas triplet 19, a vacuum generator 20, an oil collecting tank 25, a filter 26, a flow meter 27, a program control unit 28, and a plurality of angle seat valves and other key components. The system stores oil through the oil tank 11, and uses a liquid level and temperature gauge 12, an oil drain ball valve 13, a temperature sensor 14, an air filter 15, and a liquid level sensor 16 to monitor the state of the oil tank 11. The gas provided by the air source 18 is processed by the gas triplet 19, and one path is connected to the vacuum generator 20 for vacuum operation, and the other path is connected to the angle seat valve 202 for introducing compressed air when the oil collecting tank 25 is drained. The oil provided by the oil source 17 enters the inner cavity of the hydraulic travel motor through the angle seat valve 204 or the angle seat valve 205 after switching through the reversing valve under the oil filling condition, and the gas in the cavity is discharged into the oil tank 11 through the angle seat valve 10 or the angle seat valve 11 211. The oil enters the flow meter 27 to monitor the flow after being filtered by the filter 26. The oil collecting tank 25 receives the oil in the inner cavity of the hydraulic travel motor under the oil pumping condition, and the oil in the inner cavity of the hydraulic travel motor enters the oil collecting tank 25 through the angle seat valve 6 206 or the angle seat valve 7 207, and the air enters the cavity of the hydraulic travel motor through the angle seat valve 8 208 to the angle seat valve 9 209. The oil in the oil collecting tank 25 flows back to the oil tank 11 through the check valve 24 under the oil discharge condition. The program control unit 28, as the core of the system control, obtains the vacuum degree of the oil collecting tank 25 and the signal of the flow meter 27, controls the switch of the angle seat valve and the switching of the reversing valve, and realizes the automatic operation of vacuum pumping, vacuum oil extraction, oil filling and oil discharge from the oil collecting tank 25. The whole system realizes the efficient and accurate extraction and injection of the oil in the inner cavity of the hydraulic travel motor through the reasonable connection of various components and the precise control of the program control unit 28, while ensuring the stable operation of the system and the cleanliness of the oil.

[0057] The oil tank 11 serves as a storage container for oil. The liquid level and temperature of the oil tank 11 can be observed through a liquid level and liquid thermometer 12. The drain ball valve 13 is used for draining the oil in the oil tank 11. The temperature sensor 14 monitors the temperature in the oil tank 11. The air filter 15 balances the air pressure in the oil tank 11. The liquid level sensor 16 monitors the liquid level in the oil tank 11.

[0058] The oil tank 11 is connected to two air pipes, and the two air pipes have an air pipe connection end 1 401 and an air pipe connection end 2 402 respectively; the oil collecting tank 25 is connected to two oil pipes, and the two oil pipes have an oil pipe connection end 1 301 and an oil pipe connection end 2 302 respectively. The two oil pipes and the two air pipes can provide two connection positions to improve the efficiency of the oil pumping and injection operation. When in use, the oil pipe connection end 1 301 or the oil pipe connection end 2 302 is connected to the oil port 1 6 of the hydraulic travel motor oil port connector, and the air pipe connection end 1 401 or the air pipe connection end 2 402 is connected to the air port 1 9 of the hydraulic travel motor oil port connector.

[0059] The gas provided by the gas source 18 is processed by the gas triplet 19 and connected to the vacuum generator 20 on one path. The vacuum generator 20 is connected to the oil circuit of the angle seat valve 3 203 and discharged into the atmosphere through the muffler 21 for vacuum operation; the other path is connected to the angle seat valve 202 and is used to introduce compressed gas into the oil collecting tank 25 when the oil collecting tank 25 is discharging oil, so that the oil flows back to the oil tank 11 through the one-way valve 24.

[0060] The oil provided by the oil source 17 enters the inner cavity of the tested hydraulic travel motor of station one or station two through the angle seat valve four 204 or the angle seat valve five 205 under the oil filling condition after the reversing valve is switched to the corresponding position. The gas in the cavity is discharged into the oil tank 11 through the angle seat valve ten 210 or the angle seat valve eleven 211. The oil enters the flow meter 27 after being filtered by the filter 26. The flow meter 27 monitors the oil flow to determine whether the oil filling is completed.

[0061] The oil collecting tank 25 receives the oil in the inner cavity of the tested hydraulic travel motor under the oil pumping condition, and at the same time, the air enters the cavity of the tested hydraulic travel motor through angle seat valve six 206, angle seat valve seven 207, angle seat valve eight 208 or angle seat valve nine 209, and the oil in the oil collecting tank 25 flows back to the oil tank 11 through the one-way valve 24 under the oil discharge condition.

[0062] The program control unit 28 serves as the control core of the system. By obtaining the vacuum degree of the oil collecting tank 25 and the flow signal of the oil filling system flow meter 27, it controls the switching of the angle seat valve and the switching of the reversing valve, thereby realizing the automatic control of the vacuum operation, vacuum oil extraction operation, oil filling operation and oil discharge operation of the oil collecting tank 25.

[0063] In a specific embodiment, the program control unit 28 includes a vacuum control module 29 , a vacuum oil extraction control module 30 , an oil injection control module 31 , and an oil collection tank oil discharge control module 32 .

[0064] The vacuum control module 29 is used to perform vacuum operation on the oil collecting tank 25, the vacuum oil extraction control module 30 is used to perform vacuum oil extraction operation on the inner cavity of the hydraulic travel motor, the oil injection control module 31 is used to perform oil injection operation on the inner cavity of the hydraulic travel motor, and the oil collecting tank oil discharge control module 32 is used to discharge oil from the oil tank to the oil tank.

[0065] The entire oil extraction and injection system realizes efficient and accurate extraction and injection of oil from the inner cavity of the hydraulic travel motor through the reasonable connection of the above-mentioned components and the precise control of the program control unit 28, while ensuring the stable operation of the system and the cleanliness of the oil.

[0066] Embodiment 3:

[0067] Embodiment 3 of the present invention provides an oil extraction and injection method, using the oil extraction and injection system described in Embodiment 2, the oil extraction and injection method includes an oil injection operation and an oil extraction operation;

[0068] The oil injection operation comprises the following steps:

[0069] S1. Before the test of the hydraulic travel motor, a first control signal is generated. Under the action of the first control signal, the cavity of the hydraulic travel motor begins to be filled with oil, and the oil port of the oil port connector exhausts air. After the oil filling flow reaches a predetermined value, a second control signal is generated;

[0070] S2, under the action of the second control signal, ending refueling;

[0071] The oil pumping operation comprises the following steps:

[0072] S3, after the hydraulic travel motor test is completed, a third control signal is generated, under the action of the third control signal, a vacuum environment is ensured in the oil collecting tank 25, and a fourth control signal is generated after the vacuum degree of the oil collecting tank 25 reaches a preset value;

[0073] S4, pumping oil through the oil port connector under the action of the fourth control signal, and generating a fifth control signal after the oil pumping is completed;

[0074] S5. Under the action of the fifth control signal, compressed air is introduced into the oil collecting tank 25. Under the action of the compressed air, the oil in the oil collecting tank 25 is discharged into the oil tank 11. After the pressure value of the oil collecting tank 25 reaches a preset value, a sixth control signal is generated;

[0075] S6. Under the action of the sixth control signal, the oil discharge from the oil collecting tank 25 is terminated.

[0076] The oil extraction and injection method of Example 3 of the present invention realizes the automatic operation of oil injection and oil extraction through the control signal of the program control unit 28, reduces manual intervention, and improves the efficiency of oil extraction and injection.

[0077] The embodiment of the present invention effectively combines various functional units through mechanical, hydraulic and pneumatic, electrical, and control principles to achieve automated oil extraction and injection operations, shorten the oil placement and control time, improve the efficiency of vacuum oil extraction and oil injection in the inner cavity of the hydraulic travel motor, and reduce manual operation steps.

[0078] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to 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.

[0079] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A hydraulic travel motor oil port connector, characterized in that: The invention comprises a first connector (1), a second connector (2), a third connector (3) and an internal connecting pipe (4); the first connector (1) is connected to the second connector (2) to form a gas channel (8); the internal connecting pipe (4) passes through the first connector (1) and the second connector (2) and is connected to the third connector (3) to form an oil channel (5); an air port of the gas channel (8) and an oil port of the oil channel (5) are both arranged at one end of the second connector (2) and are used to be connected to the leakage oil port of the hydraulic travel motor.

2. The hydraulic travel motor oil port connector according to claim 1, characterized in that: One end of the first connector (1) is a nut end for connecting to an external ventilation pipe, and the other end is provided with an annular groove, the interior of which is hollow to form a hollow cavity, which serves as a part of the gas channel (8); one end of the second connector (2) is a nut end for connecting to the leakage oil port of the tested hydraulic travel motor, and the other end is provided with an annular groove, which is aligned with and connected to the annular groove of the first connector (1), the interior is hollow and forms a circular ring cavity with the internal connecting pipe (4), which serves as a part of the gas channel (8); one end of the third connector (3) is a nut end for connecting to the oil extraction and injection system, and the other end is connected to the internal connecting pipe (4).

3. The hydraulic travel motor oil port connector according to claim 2, characterized in that: The first connecting head (1) and the second connecting head (2) are connected by welding.

4. The hydraulic travel motor oil port connector according to claim 2, characterized in that: One end of the internal connecting tube (4) is connected to the third connecting head (3), and the other end penetrates into the second connecting head (2) and extends in the same direction until it protrudes from the nut end of the second connecting head (2).

5. The hydraulic travel motor oil port connector according to claim 4, characterized in that: The length of the internal connecting tube (4) extending out of the nut end of the second connecting head (2) is ≥20 mm.

6. The hydraulic travel motor oil port connector according to claim 5, characterized in that: The internal connecting pipe (4) vertically enters from the welding position of the first connecting head (1) and the second connecting head (2).

7. An oil pumping and injection system, using the hydraulic travel motor oil port connector according to any one of claims 1 to 6, characterized in that: include: An oil tank (11) stores oil and is equipped with a liquid level and temperature gauge (12), an oil drain ball valve (13), a temperature sensor (14), an air filter (15) and a liquid level sensor (16); An oil source (17) and an air source (18) provide oil and compressed air respectively; A gas triplex (19) for regulating the pressure of the gas source (18) and filtering impurities; A vacuum generator (20) is discharged into the atmosphere through a muffler (21) for vacuuming operation; The oil collecting tank (25) is connected to the oil tank (11) through a one-way valve (24), receives the oil under the oil pumping condition, and compresses the air to drive the oil to flow back when the oil is discharged; A flow meter (27) for monitoring the oil injection flow rate; Several angle seat valves and reversing valves to control the on / off and flow direction of oil and gas; Program control unit (28).

8. The oil extraction and injection system according to claim 7, characterized in that: The oil tank (11) is connected to two air pipes, and the two air pipes respectively have an air pipe connecting end 1 (401) and an air pipe connecting end 2 (402); the oil tank (11) is connected to two oil pipes, and the two oil pipes respectively have an oil pipe connecting end 1 (301) and an oil pipe connecting end 2 (302).

9. The oil extraction and injection system according to claim 7, characterized in that: The program control unit (28) comprises a vacuum extraction control module (29), a vacuum oil extraction control module (30), an oil injection control module (31) and an oil collection tank oil discharge control module (32).

10. An oil extraction method, using the oil extraction system according to claim 8 or 9, characterized in that: The invention comprises an oil filling operation and an oil pumping operation; the oil filling operation comprises: before the hydraulic travel motor test, the program control unit (28) generates a first control signal to start the oil filling operation for the hydraulic travel motor cavity; an oil port is used to discharge the air in the hydraulic travel motor cavity; when the flow rate of the filled oil reaches a predetermined value, the program control unit (28) generates a second control signal to stop the oil filling operation; the oil pumping operation comprises: after the hydraulic travel motor test is completed, the program control unit (28) generates a third control signal to ensure that the oil collecting tank (25) generates a vacuum environment; when the vacuum degree of the oil collecting tank (25) reaches a predetermined value, the program control unit (28) generates a fourth control signal to start the oil pumping operation through the oil port connector; after the oil pumping is completed, the program control unit (28) generates a fifth control signal to introduce compressed air into the oil collecting tank (25) so that the oil in the oil collecting tank (25) is discharged into the oil tank (11); when the pressure value of the oil collecting tank (25) reaches a predetermined value, the program control unit (28) generates a sixth control signal to end the oil discharge operation of the oil collecting tank (25).

Images