A top drive hydraulic power supply system

Abstract

This invention proposes a top-drive hydraulic power source system, belonging to the field of hydraulic power source technology. It includes a hydraulic oil tank and a T-port quick-connect coupling. The outlet of the hydraulic oil tank is connected sequentially to a suction filter, a gear pump, a throttle valve, a flow meter, and a P-port quick-connect coupling via a first pipe. The gear pump is connected to a motor drive. The motor is electrically connected to a frequency converter. The T-port quick-connect coupling is connected sequentially to a return oil filter and the inlet of the hydraulic oil tank via a pipe. The L-port quick-connect coupling is connected to the inlet of the hydraulic oil tank via a pipe. The hydraulic oil inlet of the top-drive hydraulic actuator is connected to the P-port quick-connect coupling, and the outlet is connected to either the T-port quick-connect coupling or the L-port quick-connect coupling. By controlling the motor with the frequency converter, variable speed operation is achieved, enabling the top-drive equipment to operate at low speeds when the equipment is not under load. This reduces oil leakage, minimizes overheating and gear pump wear, extends service life, and saves energy.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic power source technology, and specifically relates to a top drive hydraulic power source system. Background Technology

[0002] The top drive, short for the top-drive drilling unit of an oil drilling rig, consists of a power swivel and tubing handling device. It drives the drill string to rotate and tightens or loosens drill string joints, moving up and down along guide rails to complete drilling operations. The top drive is a highly integrated electromechanical-hydraulic-information product capable of operating at any height on the derrick. It significantly increases drilling speed, improves wellbore quality, reduces tripping time, effectively prevents blowouts and stuck pipe accidents, and reduces worker workload. Besides the main rotary motion driven by the main motor, all auxiliary movements of the top drive are completed through a hydraulic system, including a balancing system, back tongs system, tilting system, floating system, locking system, IBOP system, braking system, and slewing system. The top drive hydraulic power source provides power to the hydraulic system and is generally installed on the top drive body. Its high integration makes the structure more compact and facilitates transportation.

[0003] The working process of a top-drive hydraulic system is actually a process of energy conversion and transfer. Various losses are inevitable in the process of energy conversion and transfer, and it can be said that most of the energy consumption is lost in the process of energy conversion.

[0004] For example, a top drive hydraulic control system disclosed in CN108757608B relates to the field of oil and gas drilling equipment technology, and particularly to a top drive hydraulic control system that uses a hydraulic motor, pressure sensor, and hydraulic disc brake device to achieve top drive spindle braking, real-time monitoring of oil circuit pressure, and full / half displacement control of the hydraulic motor. This top drive hydraulic control system includes a top drive body, a top drive spindle, a hydraulic motor, a hydraulic disc brake device, and a hydraulic motor control system fixedly connected to the top drive body, and a pump source control system flexibly connected to the hydraulic motor control system. The hydraulic motor includes two sub-motors, namely hydraulic motor one and hydraulic motor two. The hydraulic disc brake device consists of a brake disc and a brake caliper. The brake disc is fixedly connected to the top drive spindle, and the brake caliper is fixedly connected to the top drive body. The brake disc is placed in the brake caliper. Using this hydraulic control system for the top drive saves floor space, reduces the weight of the entire hydraulic motor control system, reduces the risk of severe heating in the hydraulic system, enables the top drive spindle to rotate even without a power source, and allows real-time monitoring of the hydraulic motor's working pressure, reducing the risk of wellbore disengagement.

[0005] Through research and practical application, it was found that the current control method of the motor in the top drive hydraulic system is constant speed operation. Constant speed operation causes the hydraulic pump to wear out significantly, has a short lifespan, and wastes a lot of energy. Therefore, a hydraulic system that can adjust the motor speed of the top drive hydraulic system is needed. Summary of the Invention

[0006] To address the above problems, this invention proposes a top-drive hydraulic power source system, including a hydraulic oil tank and a T-port quick-connect coupling.

[0007] The hydraulic oil tank outlet is connected in sequence to the suction filter, gear pump, throttle valve, flow meter and P-port quick connector via the first pipe; the gear pump is connected to the motor drive; the motor is electrically connected to the frequency converter;

[0008] The T-port quick-connect fitting is connected to the return oil filter and the hydraulic oil tank inlet in sequence via pipes; the L-port quick-connect fitting is connected to the hydraulic oil tank inlet via pipes.

[0009] The hydraulic oil inlet of the top-drive hydraulic actuator is connected to the P-port quick-connect connector, and the outlet is connected to either the T-port quick-connect connector or the L-port quick-connect connector.

[0010] Furthermore, a heat exchanger is installed on the pipeline between the L-port quick-connect fitting and the hydraulic oil tank.

[0011] Furthermore, the system also includes an accumulator, which is connected to the inlet of the hydraulic oil tank via a second pipe, and a normally open shut-off valve and an overflow valve are sequentially installed on the second pipe;

[0012] The first pipe between the gear pump and the throttle valve is connected to the second pipe between the overflow valve and the normally open shut-off valve via a fourth pipe.

[0013] Furthermore, it also includes a third pipeline, one end of which is connected to the second pipeline between the accumulator and the normally open shut-off valve, and the other end of which is connected to the second pipeline between the relief valve and the hydraulic oil tank. A normally closed shut-off valve is installed on the third pipeline.

[0014] Furthermore, a pressure testing connector is connected to the connection end between the fourth pipe and the second pipe.

[0015] Furthermore, the system also includes a controller, which is electrically connected to the flow meter and the frequency converter, respectively.

[0016] Furthermore, the system also includes a pressure sensor and a temperature sensor electrically connected to the controller. The pressure sensor is connected to a first pipe between the gear pump and the throttle valve via a pipe, and the temperature sensor is disposed on the outer surface of the hydraulic oil tank.

[0017] Furthermore, the system also includes a pressure gauge, which is connected to a first pipe between the gear pump and the throttle valve via a pipe, and a pressure gauge ball valve is connected to the pipe between the pressure gauge and the first pipe.

[0018] Furthermore, an air filter is installed on the hydraulic oil tank.

[0019] Furthermore, a level gauge is installed on the hydraulic oil tank.

[0020] Beneficial effects:

[0021] 1. This invention achieves variable speed operation of the top drive equipment by setting up a frequency converter, which controls the motor. This allows the top drive equipment to operate at low speeds when the equipment is not under load, thereby reducing oil leakage, reducing the overheating of the hydraulic system and the wear of the gear pump, improving service life, and saving energy. At the same time, the frequency converter control allows the motor to run at a higher speed in a shorter time, thereby increasing the response speed of the top drive equipment. The hydraulic oil of the top drive hydraulic actuator can be connected to either an L-port quick-connect connector or a T-port quick-connect connector as needed. The connection to the L-port quick-connect connector allows for rapid oil leakage when the motor is rotating at high speed, improving the circulation of hydraulic oil. The connection to the T-port quick-connect connector allows for secondary filtration of the hydraulic oil, reducing impurities in the hydraulic oil.

[0022] 2. The present invention has a pressure gauge ball valve provided on the side surface of the valve block, and a pressure gauge is connected to the outlet of the pressure gauge ball valve. The pressure gauge is used to facilitate workers to check the pressure.

[0023] 3. This invention includes an electrical control box; the electrical control box contains a controller, which is electrically connected to a flow meter, a pressure sensor mounted on the valve block, a frequency converter, and a temperature sensor mounted in the hydraulic oil tank. By receiving signals from the flow meter, pressure sensor, and temperature sensor, the controller controls the frequency converter to operate, thereby precisely regulating the motor's operation.

[0024] 4. The present invention is equipped with an accumulator, which is connected to the output end of the gear pump through a normally open shut-off valve. The accumulator can store a certain amount of hydraulic energy, which can be used as an auxiliary power source. It can also absorb hydraulic shock, eliminate pulsation, reduce noise, and compensate for leakage in the hydraulic system, thereby ensuring the stability of the hydraulic system.

[0025] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 The hydraulic schematic diagram of the top drive hydraulic power source system is shown.

[0028] Figure 2 The diagram shows the installation positions of the hydraulic oil tank and the main pump unit of the top drive hydraulic power source in an embodiment of the present invention.

[0029] Figure 3 A schematic diagram showing the installation positions of the accumulator and electrical control box of the top drive hydraulic power source in an embodiment of the present invention is shown.

[0030] Figure 4 It shows Figure 3 The front view.

[0031] Figure 5 A schematic diagram showing the connection between the motor and gear pump of the top drive hydraulic power source in an embodiment of the present invention is shown.

[0032] Figure 6 This diagram illustrates the connection of the motor and gear pump of the top-drive hydraulic power source from another angle in an embodiment of the present invention.

[0033] In the diagram, 1. Motor; 2. Bell jar; 3. Coupling; 4. Pressure sensor; 5. Gear pump; 6. Valve block; 7. Relief valve; 8. Compression fitting one; 9. Throttle valve; 10. Compression fitting two; 11. Pressure gauge ball valve; 12. Pressure gauge; 13. Frequency converter; 14. Controller; 15. Flow meter; 16. P-port quick-connect fitting; 17. T-port quick-connect fitting; 18. L-port quick-connect fitting; 19. Return oil filter; 20. Heat exchanger; 21. Suction oil filter; 22. Temperature sensor; 23. Air filter; 4. Level gauge; 25. Hydraulic oil tank; 26. Drain ball valve; 27. Normally open shut-off valve; 28. Accumulator; 29. ​​Normally closed shut-off valve; 30. Pressure test connector; 31. Electrical control box; 32. Electrical control box bracket; 33. Hydraulic power source mounting bracket; 34. Lifting eye screw; 35. Observation window; 36. Welded ear plate; 37. End straight connector; 38. Oil tank protective cover; 39. Accumulator valve block; 40. Valve block base plate; 41. Accumulator support frame; 42. Hydraulic power source main pump set; 43. Main pump set mounting plate; 44. Main pump set base plate;

[0034] 100. First pipeline; 110. Second pipeline; 120. Third pipeline; 130. Fourth pipeline. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] like Figure 1 As shown, Figure 1 A hydraulic schematic diagram of the top drive hydraulic power source system is shown. (Reference) Figure 1 A top-drive hydraulic power source system includes a hydraulic oil tank 25 and a T-port quick-connect fitting 17. The outlet of the hydraulic oil tank 25 is connected to a suction filter 21, a gear pump 5, a throttle valve 9, a flow meter 15, and a P-port quick-connect fitting 16 in sequence via a first pipe 100. The gear pump 5 is connected to a motor 1 for transmission. The motor 1 is electrically connected to a frequency converter 13. The T-port quick-connect fitting 17 is connected to a return oil filter 19 and the inlet of the hydraulic oil tank 25 in sequence via a pipe. The hydraulic oil inlet of the top-drive hydraulic actuator is connected to the P-port quick-connect fitting 16, and the outlet is connected to either the T-port quick-connect fitting 17 or the L-port quick-connect fitting 18. The hydraulic oil of the top-drive hydraulic actuator is connected to either the L-port quick-connect fitting or the T-port quick-connect fitting as needed. The connection to the L-port quick-connect fitting allows for rapid oil discharge when the motor is rotating at high speed, improving the circulation of the hydraulic oil. The connection to the T-port quick-connect fitting allows for further filtration of the hydraulic oil, reducing impurities in the hydraulic oil.

[0037] Specifically, the system also includes an L-port quick-connect fitting 18 and a heat exchanger 20. The L-port quick-connect fitting 18 is connected to the heat exchanger 20 and the inlet of the hydraulic oil tank 25 via pipes. The heat exchanger 20 cools the hydraulic oil, thereby reducing its temperature. The system also includes an accumulator 28, which is connected to the inlet of the hydraulic oil tank 25 via a second pipe 110. A normally open shut-off valve 27 and a relief valve 7 are sequentially installed on the second pipe 110. The first pipe 100 between the gear pump 5 and the throttle valve 9 is connected to the second pipe 110 between the relief valve 7 and the normally open shut-off valve 27 via a fourth pipe 130. The accumulator 28 is connected to the output end of the gear pump 5 via the normally open shut-off valve 27 (through the second pipe 110 and the fourth pipe 130). The accumulator 28 can store a certain amount of hydraulic energy for use as an auxiliary power source. It can also absorb hydraulic shocks, eliminate pulsations, reduce noise, and compensate for leakage in the hydraulic system, thereby ensuring the stability of the hydraulic system. It also includes a third pipe 120, one end of which is connected to the second pipe 110 between the accumulator 28 and the normally open shut-off valve 27, and the other end is connected to the second pipe 110 between the relief valve 7 and the hydraulic oil tank 25. A normally closed shut-off valve 29 is installed on the third pipe 120. The relief valve 7 is also designed as a safety valve, preventing excessive output pressure of the hydraulic system by setting a certain pressure. The normally closed shut-off valve 29 remains closed under normal use, and can be opened to relieve pressure in the hydraulic system when necessary. A pressure testing connector 30 is connected to the connection end of the fourth pipe 130 and the second pipe 110. This is used to connect an external pressure testing device for convenient pressure testing by workers.

[0038] The system also includes a controller 14, which is a PLC, electrically connected to a flow meter 15, a frequency converter 13, and a temperature sensor 22 connected to a hydraulic oil tank 25. Specifically, the system also includes a pressure sensor 4 and a temperature sensor 22 electrically connected to the controller 14. The pressure sensor 4 is connected to a first pipe 100 between the gear pump 5 and the throttle valve 9 via a pipe, and the temperature sensor 22 is disposed on the outer surface of the hydraulic oil tank 25.

[0039] To facilitate workers' observation of pressure and comparison with the pressure value of pressure sensor 4, a pressure gauge 12 is provided. The pressure gauge 12 is connected to the first pipe 100 between the gear pump 5 and the throttle valve 9 through a pipe, and a pressure gauge ball valve 11 is connected to the pipe between the pressure gauge 12 and the first pipe 100.

[0040] like Figure 2 As shown, Figure 2 This diagram illustrates the installation positions of the hydraulic oil tank and the main pump unit of the top-drive hydraulic power source in an embodiment of the present invention. (Reference) Figure 2This includes a hydraulic power source mounting bracket 33 connected to the top drive body. A hydraulic oil tank 25 and a hydraulic power source main pump assembly 42 are sequentially fixed to the side surface of the hydraulic power source mounting bracket 33. The hydraulic power source mounting bracket 33 is an L-shaped plate, inside which the hydraulic oil tank 25 and the hydraulic power source main pump assembly 42 are sequentially installed from top to bottom (e.g., ...). Figure 2 As shown, the hydraulic power source main pump unit 42 is fixedly connected to the main pump unit mounting plate 43 by bolts. The main pump unit mounting plate 43 and the main pump unit base plate 44 are connected by their respective dovetail groove structures and are limited and fixed by bolts. The main pump unit base plate 44 is mounted on the hydraulic power source mounting bracket 33 by bolts and washers. The hydraulic oil tank 25 is mounted on the hydraulic power source mounting bracket 33 by bolts at its bottom and top. The return oil filter 19, suction oil filter 21, temperature sensor 22, air filter 23, level gauge 24 and drain ball valve 26 are all installed on the hydraulic oil tank 25 by threaded connection. The hydraulic oil tank 25 is also equipped with an observation window 35. Four lifting eye screws 34 are installed on the upper surface of the hydraulic oil tank 25 for lifting the hydraulic oil tank 25.

[0041] Specifically, the hydraulic power source main pump unit 42 includes a motor 1 and a gear pump 5. The motor 1 and gear pump 5 are connected by a drive connection. The output shaft of the motor 1 and the gear pump 5 are connected together by a coupling 3. The bell housing 2 is installed and fixed on the flange face of the motor 1 by bolts and nuts to protect the coupling 3. The gear pump 5 is equipped with a valve block 6 and a frequency converter 13, which is electrically connected to the gear pump 5. The side surface of the valve block 6 is equipped with a compression fitting 8 and a throttle valve 9. The valve block 6 is connected to the gear pump 5 by bolts. The throttle valve 9 is connected to the flow meter 15 and the P-port quick connector 16 in sequence through the first pipe 100. The compression fitting 8 is connected to the hydraulic oil tank 25 through a pipe. The hydraulic oil tank 25 is connected to a T-port quick connector 17. The P-port quick connector 16 and the T-port quick connector 17 are respectively connected to the inlet and outlet of the top drive hydraulic actuator of the top drive body. The gear pump 5 driven by motor 1 delivers the hydraulic oil in the hydraulic oil tank 25 to the top drive hydraulic actuator through the P-port quick connector 16. Then, the top drive hydraulic actuator returns the hydraulic oil to the hydraulic oil tank 25 through the T-port quick connector 17, completing the circulation of the hydraulic oil.

[0042] In the above embodiments, an alternative implementation may be provided, in which an overflow valve 7 is provided on the valve block 6, located on the side of the valve block 6 away from the gear pump 5. The overflow valve 7 is used to relieve pressure and prevent excessive pressure from rupturing the first pipe 100 and the second pipe 110. A compression fitting 10 is provided on the valve block 6, located on one side of the valve block 6, and connected to the hydraulic oil tank 25 through a drain pipe. A pressure sensor 4 is provided on the valve block 6, located on the side of the valve block 6 away from the throttle valve 9, and is used to detect the pressure of the hydraulic oil at the outlet of the gear pump 5.

[0043] refer to Figure 6 A pressure gauge ball valve 11 is provided on the side surface of the valve block 6. The pressure gauge ball valve 11 is located on the side of the valve block 6 away from the compression fitting 10. A pressure gauge 12 is connected to the outlet of the pressure gauge ball valve 11. The pressure gauge 12 is used for workers to check the pressure. A return oil filter 19 is provided on the side of the hydraulic oil tank 25 away from the motor 1. The return oil filter 19 is connected to the T-port quick connector 17.

[0044] Specifically, a suction filter 21 is installed on the side of the hydraulic oil tank 25. The outlet end of the suction filter 21 is connected to the drain ball valve 26, which is connected through a pipe and a compression fitting 8. An accumulator 28 is installed on the side of the hydraulic power source mounting bracket 33 away from the hydraulic oil tank 25. An accumulator valve block 39 is installed on the accumulator 28. The accumulator valve block 39 is fixedly connected to the hydraulic power source mounting bracket 33 through a valve block base plate 40. A normally closed shut-off valve 29 is installed on the side of the accumulator valve block 39 away from the hydraulic power source mounting bracket 33. The normally closed shut-off valve 29 is connected to the inlet of the hydraulic oil tank 25. Specifically, a normally open shut-off valve 27 is installed on the accumulator valve block 39, which is connected to the outlet of the gear pump 5 via the second pipe 110. A pressure testing connector 30 is installed on the normally closed shut-off valve 29, symmetrical to the normally open shut-off valve 27, and is used to connect an external pressure testing device. A welded lug 36 is installed on the side of the hydraulic power source mounting bracket 33 away from the hydraulic oil tank 25, and is connected to the top drive body via the welded lug 36. An oil tank protective cover 38 is installed on the hydraulic power source mounting bracket 33 to prevent sludge and impurities from falling onto the hydraulic oil tank 25. The valve block base plate 40 and the accumulator support frame 41 are welded to the hydraulic power source mounting frame 33. The accumulator valve block 39 is fixed to the valve block base plate 40 by bolts. The normally open stop valve 27, normally closed stop valve 29, pressure test connector 30, and end straight connector 37 are all installed on the accumulator valve block 39. At the same time, the bottom of the accumulator 28 is connected to the accumulator valve block 39 by a threaded connection. The upper part of the accumulator 28 is fixed by the accumulator support frame 41 to prevent the accumulator 28 from loosening.

[0045] In this invention, an electrical control box 31 is installed on the side of the hydraulic power source mounting bracket 33 away from the hydraulic oil tank 25. The electrical control box 31 houses a controller 14, which is electrically connected to a flow meter 15, a pressure sensor 4 mounted on the valve block 6, a frequency converter 13, and a temperature sensor 22 mounted on the hydraulic oil tank 25. By receiving signals from the flow meter 15, pressure sensor 4, and temperature sensor 22, the controller controls the frequency converter 13 to operate. The electrical control box 31 is mounted on an electrical control box bracket 32 ​​using bolts and nuts, and the electrical control box bracket 32 ​​is mounted on the hydraulic power source mounting bracket 33 using bolts and nuts.

[0046] Working principle of this invention:

[0047] The hydraulic oil tank 25 stores the hydraulic oil, the medium of the hydraulic system. The hydraulic oil tank 25 is equipped with a suction filter 21, a temperature sensor 22, an air filter 23, a level gauge 24, and a drain ball valve 26. The drain ball valve 26 is used to drain the hydraulic oil from the hydraulic oil tank 25. The air filter 23 connects the inside and outside of the hydraulic oil tank 25. The level gauge 24 measures the amount of hydraulic oil in the hydraulic oil tank 25. The motor 1 drives the gear pump 5 to rotate, thereby drawing the hydraulic oil from the hydraulic oil tank 25 through the suction filter 21 into the gear pump 5, and outputting high-pressure hydraulic oil through the outlet of the gear pump 5. A pressure sensor 4 is designed to detect the pressure of the high-pressure hydraulic oil at the outlet of the gear pump 5. A pressure gauge ball valve 11 and a pressure gauge 12 are also designed, allowing the reading on the pressure gauge 12 to be compared with the data from the pressure sensor 4 to ensure the accuracy of the outlet pressure reading.

[0048] An accumulator 28 is designed and connected to the output end of the gear pump 5 via a normally open shut-off valve 27 (achieved through the second pipe 110 and the fourth pipe 130). The accumulator 28 can store a certain amount of hydraulic energy, which can be used as an auxiliary power source. It can also absorb hydraulic shock, eliminate pulsation, reduce noise, and compensate for leakage in the hydraulic system, thereby ensuring the stability of the hydraulic system. The pressure test connector 30 can be connected to an external pressure gauge to detect the outlet pressure of the hydraulic oil in the gear pump 5. An overflow valve 7 is also designed as a safety valve, which prevents the output pressure of the hydraulic system from becoming too high by setting a certain pressure. The normally closed shut-off valve 29 is kept closed during normal use, and the pressure in the hydraulic system can be relieved by opening the normally closed shut-off valve 29 when necessary. The high-pressure hydraulic oil from the gear pump 5 is output to the hydraulic actuator in sequence through the throttle valve 9, the flow meter 15, and the P-port quick-connect connector 16. The frequency converter 13 controls the speed of the motor 1 by changing the frequency. The controller 14 is placed in the electrical control box 31 and simultaneously collects data from the flow meter 15, pressure sensor 4, and temperature sensor 22. The controller 14 analyzes this data and adjusts and optimizes the output pressure and flow of the gear pump 5 through the frequency converter 13, thereby achieving closed-loop control. In addition to the high-pressure hydraulic oil outlet P, the hydraulic power system is also designed with a return oil port T. The hydraulic oil of the hydraulic actuator returns to the hydraulic oil tank 25 through the T-port quick-connect fitting 17 and the return oil filter 19. In addition, the drain line of the hydraulic actuator can return to the hydraulic oil tank 25 through the L-port quick-connect fitting 18 and the heat exchanger 20. The hydraulic oil temperature in the drain line is relatively high, and the heat exchanger 20 reduces the temperature of the hydraulic oil to a certain extent.

[0049] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A top drive hydraulic power source system, comprising: Includes a hydraulic oil tank (25), a T-port quick-connect fitting (17), and an L-port quick-connect fitting (18). The outlet of the hydraulic oil tank (25) is connected in sequence to the suction filter (21), gear pump (5), throttle valve (9), flow meter (15) and P-port quick connector (16) through the first pipe (100); the gear pump (5) is driven by the motor (1); the motor (1) is electrically connected to the frequency converter (13); The T-port quick connector (17) is connected to the return oil filter (19) and the inlet of the hydraulic oil tank (25) in sequence through a pipe; the L-port quick connector (18) is connected to the inlet of the hydraulic oil tank (25) through a pipe; The hydraulic oil inlet of the top-drive hydraulic actuator is connected to the P-port quick-connect connector (16), and the outlet is connected to the T-port quick-connect connector (17) or the L-port quick-connect connector (18).

2. The top drive hydraulic power supply system of claim 1, wherein, A heat exchanger (20) is installed on the pipeline between the L-port quick-connect fitting (18) and the hydraulic oil tank (25).

3. The top-drive hydraulic power source system according to claim 1, characterized in that, The system also includes an accumulator (28), which is connected to the inlet of the hydraulic oil tank (25) through a second pipe (110). A normally open shut-off valve (27) and an overflow valve (7) are sequentially provided on the second pipe (110). The first pipe (100) between the gear pump (5) and the throttle valve (9) is connected to the second pipe (110) between the relief valve (7) and the normally open shut-off valve (27) via the fourth pipe (130).

4. The top-drive hydraulic power source system according to claim 3, characterized in that, It also includes a third pipe (120), one end of which is connected to the second pipe (110) between the accumulator (28) and the normally open shut-off valve (27), and the other end is connected to the second pipe (110) between the overflow valve (7) and the hydraulic oil tank (25). A normally closed shut-off valve (29) is provided on the third pipe (120).

5. A top-drive hydraulic power source system according to claim 3, characterized in that, A pressure testing connector (30) is connected at the connection end between the fourth pipe (130) and the second pipe (110).

6. The top-drive hydraulic power source system according to claim 1, characterized in that, The system also includes a controller (14), which is electrically connected to the flow meter (15) and the frequency converter (13).

7. A top-drive hydraulic power source system according to claim 6, characterized in that, The system also includes a pressure sensor (4) and a temperature sensor (22) electrically connected to the controller (14). The pressure sensor (4) is connected to a first pipe (100) between the gear pump (5) and the throttle valve (9) via a pipe. The temperature sensor (22) is disposed on the outer surface of the hydraulic tank (25).

8. A top-drive hydraulic power source system according to claim 6, characterized in that, The system also includes a pressure gauge (12), which is connected to a first pipe (100) between the gear pump (5) and the throttle valve (9) via a pipe, and a pressure gauge ball valve (11) is connected to the pipe between the pressure gauge (12) and the first pipe (100).

9. A top-drive hydraulic power source system according to claim 1, characterized in that, An air filter (23) is provided on the hydraulic oil tank (25).

10. A top-drive hydraulic power source system according to claim 1, characterized in that, The hydraulic oil tank (25) is equipped with a level gauge (24).

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