Power head system and rotary drilling rig

Abstract

The present invention provides a power head system and a rotary drilling rig, which relate to the technical field of engineering machinery. The power head system includes a power box, a reducer, a first liquid pump and a filter. The power box is provided with a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet of the power box are connected to the reducer through pipes respectively. The first liquid pump is arranged on the pipe between the power box and the reducer. The filter is installed on the pipe between the liquid outlet of the power box and the reducer. The rotary drilling rig includes the above-mentioned power head system. The present invention alleviates the technical problem in the prior art that the gears in the reducer in the power head system of the rotary drilling rig are often in a high-speed operation state, which not only generates a large amount of heat due to friction with the bearings, but also drives impurities such as iron filings in the gear oil to move rapidly, thereby aggravating the wear of the gears, and thus greatly affecting the service life of the reducer.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, in particular to a power head system and a rotary drilling rig. Background Art

[0002] The power head system is a key component of a rotary drilling rig. It consists of a power head motor, a speed reducer, and a power box, which are connected in sequence. The power box is connected to the drill pipe of the rotary drilling rig. The power head motor converts hydraulic energy into mechanical energy and outputs speed and torque. The speed reducer and power box are used to reduce the speed output by the power head motor and increase the torque. The reduced speed and increased torque are then transmitted to the drill pipe, driving the drill pipe's rotation.

[0003] The reducer in the power head system of a rotary drilling rig is equipped with gears for reducing transmission and gear oil for protecting the above gears. Since rotary drilling rigs are often used in construction processes with complex working conditions, the gears in their reducers are often in a high-speed operation state.

[0004] Gears running at high speed will not only generate a lot of heat due to friction with the bearings, but will also drive impurities such as iron filings in the gear oil to move rapidly, thereby increasing gear wear, which will greatly affect the service life of the reducer. Summary of the Invention

[0005] The purpose of the present invention is to provide a power head system and a rotary drilling rig to alleviate the technical problem in the prior art that the gears in the reducer of the rotary drilling rig power head system are often in a high-speed operation state, which not only generates a large amount of heat due to friction between the bearings, but also drives impurities such as iron filings in the gear oil to move rapidly, thereby aggravating the wear of the gears, and thus greatly affecting the service life of the reducer.

[0006] The power head system provided by the present invention includes a power box, a reducer, a first liquid pump and a filter;

[0007] The power box is provided with a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet of the power box are connected to the reducer through pipelines respectively;

[0008] The first liquid pump is arranged on the pipeline between the power box and the reducer;

[0009] The filter is installed on the pipe between the liquid outlet of the power box and the reducer.

[0010] Furthermore, along the height direction of the reducer, the reducer is provided with a first liquid inlet, a second liquid inlet and a liquid return port in sequence, and relative to the bottom surface of the reducer, the heights of the first liquid inlet, the liquid return port and the second liquid inlet of the reducer increase in sequence;

[0011] The first liquid inlet and the second liquid inlet are both connected to the liquid return port on the power box through a pipeline; the liquid return port of the reducer is connected to the liquid inlet on the power box through a pipeline.

[0012] Furthermore, the power head system further includes a first branch pipeline and a first overflow valve;

[0013] The first branch pipeline is connected between the power box and the first liquid pump, and the first overflow valve is installed on the first branch pipeline.

[0014] Furthermore, the first liquid pump is a gear pump, and the power head system also includes a motor, which is connected to the first liquid pump and is used to drive the first liquid pump to work.

[0015] Furthermore, the motor is a hydraulic motor, and the power head system further includes a second liquid pump and a liquid medium source;

[0016] The hydraulic motor includes an inlet and an outlet, both of which are connected to a liquid medium source through a pipeline, and the second liquid pump is connected to the pipeline between the hydraulic motor and the liquid medium source.

[0017] Furthermore, the pipeline between the liquid medium source and the inlet of the hydraulic motor is the liquid inlet pipeline, and the pipeline between the outlet of the hydraulic motor and the liquid medium source is the liquid outlet pipeline; the second liquid pump is connected to the liquid inlet pipeline;

[0018] The power head system further includes a reversing valve, which is connected to the liquid inlet pipeline at a position between the second liquid pump and the inlet of the hydraulic motor, and the reversing valve is connected to the liquid outlet pipeline;

[0019] The reversing valve includes two stations, one of which is used to connect the liquid inlet pipe and the liquid outlet pipe respectively to form a circulation loop between the liquid medium source and the hydraulic motor; the other station is used to connect the liquid inlet pipe and the liquid outlet pipe.

[0020] Furthermore, the power head system also includes a speed regulating valve, which is connected to a pipeline between the inlet of the hydraulic motor and the liquid medium source.

[0021] Furthermore, the power head system further includes a second branch pipe and a second overflow valve;

[0022] The second liquid pump includes an inlet and an outlet, and the second branch pipe is connected between the outlet of the second liquid pump and the liquid medium source;

[0023] The second overflow valve is installed on the second branch pipeline.

[0024] Furthermore, the second liquid pump is a gear pump, and the power head system also includes an engine, which is connected to the second liquid pump and is used to drive the second liquid pump to work.

[0025] The rotary drilling rig provided by the present invention includes the power head system described in any one of the above technical solutions.

[0026] The internal drilling system and rotary drilling rig provided by the present invention can produce the following beneficial effects:

[0027] The powerhead system provided by the present invention includes a power box, a reducer, a first liquid pump, and a filter. The power box's liquid inlet and liquid outlet are connected to the reducer via pipes. The first liquid pump is located on the pipe between the power box and the reducer. The filter is installed on the pipe between the power box's liquid outlet and the reducer. When the first liquid pump begins operating, it drives the gear oil in the reducer out of the reducer, through the power box's liquid inlet, and into the power box. Once in the power box, the gear oil continues to flow through the power box under the action of the first liquid pump and out of the power box's liquid outlet. It then passes through the filter between the power box's liquid outlet and the reducer before returning to the reducer. During this flow process, the gear oil in the reducer dissipates heat from the reducer into the power box. The power box is an integral component of the powerhead system and is typically larger than the reducer. Therefore, the power box increases the heat dissipation area, thereby effectively dissipating heat from the gear oil in the reducer and extending the service life of the reducer. The power box is also filled with gear oil to protect the gears within the power box. The gear oil within the reducer and the gear oil within the power box can circulate in the pipeline, and the reducer can always be filled with gear oil. In addition, when the gear oil in the reducer flows through the filter during the above-mentioned flow process, impurities such as iron filings in the gear oil can be intercepted by the filter and, under the action of the first liquid pump, can be retained on the side of the filter facing away from the reducer. At this time, the iron filings and other impurities in the gear oil can only be removed from the reducer by the action of the first liquid pump, and cannot return to the reducer due to the combined action of the filter and the first liquid pump. This can reduce the wear of the gears in the reducer caused by impurities such as iron filings in the gear oil, thereby extending the service life of the reducer.

[0028] It can be seen that compared with the prior art, the power head system provided by the present invention utilizes the combined use of the first liquid pump and the power box to increase the heat dissipation area of the gear oil in the reducer, thereby achieving the effect of dissipating heat from the reducer. The combined use of the first liquid pump and the filter can continuously remove impurities such as iron filings from the gear oil in the reducer and prevent these impurities from returning to the reducer, thereby reducing wear on the gears in the reducer. By improving the heat dissipation effect in the reducer and reducing the impurity content in the gear oil in the reducer, the service life of the reducer can be extended.

[0029] The rotary drilling rig provided by the present invention includes the above-mentioned power head system, and thus the rotary drilling rig provided by the present invention has the same beneficial effects as the above-mentioned power head system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 This is a schematic diagram of the working principle of the power head system provided in Example 1 of the present invention.

[0032] Icon: 1-power box; 10-liquid inlet; 11-liquid outlet; 2-reducer; 20-first liquid inlet; 21-second liquid inlet; 22-return liquid outlet; 3-first liquid pump; 30-motor; 4-filter; 5-first branch pipe; 50-first overflow valve; 6-second liquid pump; 60-engine; 7-liquid medium source; 8-reversing valve; 80-liquid inlet pipe; 800-speed regulating valve; 81-liquid outlet pipe; 9-second branch pipe; 90-second overflow valve. DETAILED DESCRIPTION

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

[0034] Example 1:

[0035] like Figure 1 As shown, the power head system provided in this embodiment includes a power box 1, a reducer 2, a first liquid pump 3 and a filter 4. The power box 1 is provided with a liquid inlet 10 and a liquid outlet 11, and the liquid inlet 10 and the liquid outlet 11 of the power box 1 are connected to the reducer 2 through pipes respectively. The first liquid pump 3 is arranged on the pipe between the power box 1 and the reducer 2. The filter 4 is installed on the pipe between the liquid outlet 11 of the power box 1 and the reducer 2.

[0036] When the first liquid pump 3 begins operating, it drives the gear oil in the reducer 2 out of the reducer 2, through the liquid inlet 10 of the power box 1, and into the power box 1. Once in the power box 1, the gear oil continues to flow through the power box 1 under the action of the first liquid pump 3, out of the liquid outlet 11 of the power box 1, and then through the filter 4 between the liquid outlet 11 of the power box 1 and the reducer 2, returning to the reducer 2. During this flow, the gear oil in the reducer 2 dissipates heat from the reducer 2 into the power box 1. The power box 1 is an integral part of the powerhead system, and its volume is typically larger than that of the reducer 2. Therefore, the power box 1 increases the heat dissipation area, effectively dissipating heat from the gear oil in the reducer 2 and extending the service life of the reducer 2. The power box 1 is also filled with gear oil to protect the gears within the power box 1. The gear oil in the reducer 2 and the gear oil in the power box 1 can circulate in the pipeline, ensuring that the reducer 2 always has gear oil.

[0037] Furthermore, when the gear oil in the reducer 2 flows through the filter 4 during the aforementioned flow process, impurities such as iron filings in the gear oil are intercepted by the filter 4 and retained on the side of the filter 4 facing away from the reducer 2 by the action of the first liquid pump 3. At this point, the iron filings and other impurities in the gear oil can only be carried out of the reducer 2 by the action of the first liquid pump 3, and cannot return to the reducer 2 due to the combined action of the filter 4 and the first liquid pump 3. This reduces wear on the gears in the reducer 2 caused by impurities such as iron filings in the gear oil, thereby extending the service life of the reducer 2.

[0038] It can be seen that compared with the prior art, the power head system provided in this embodiment can increase the heat dissipation area of the gear oil in the reducer 2 by using the first liquid pump 3 and the power box 1 in combination, thereby achieving the effect of dissipating heat from the reducer 2. The use of the first liquid pump 3 and the filter 4 in combination can continuously remove impurities such as iron filings in the gear oil in the reducer 2 and prevent the above-mentioned impurities such as iron filings from returning to the reducer 2, thereby reducing the wear on the gears in the reducer 2. After the heat dissipation effect of the reducer 2 is improved and the impurity content in the gear oil in the reducer 2 is reduced, the service life of the reducer 2 can be extended.

[0039] Therefore, the power head system provided in this embodiment alleviates the technical problem in the prior art that the gears in the reducer in the rotary drilling rig power head system are often in a high-speed operation state, which not only generates a large amount of heat due to friction with the bearings, but also drives impurities such as iron filings in the gear oil to move rapidly, thereby aggravating the wear of the gears, and thus greatly affecting the service life of the reducer.

[0040] There is no limit to the number of reducers 2. When there are multiple reducers 2 in the power head system provided in the embodiment, the multiple reducers 2 can be connected in parallel through pipelines.

[0041] like Figure 1 As shown, along the height direction of the reducer 2, the reducer 2 is provided with a first liquid inlet 20, a second liquid inlet 21, and a liquid return port 22. The heights of the first liquid inlet 20, the liquid return port 22, and the second liquid inlet 21 of the reducer 2 increase in sequence relative to the bottom surface of the reducer 2. The first liquid inlet 20 and the second liquid inlet 21 are both connected to the liquid return port 22 on the power box 1 through a pipe, and the liquid return port 22 of the reducer 2 is connected to the liquid inlet 10 on the power box 1 through a pipe.

[0042] The first liquid pump 3 can extract the gear oil in the reducer 2 from the return liquid port 22 located at a height between the first liquid inlet 20 and the second liquid inlet 21, and simultaneously send the gear oil that has been cooled and filtered into the reducer 2 through the first liquid inlet 20 and the second liquid inlet 21.

[0043] Since the heights of the first liquid inlet 20, the return liquid port 22, and the second liquid inlet 21 of the reducer 2 increase in sequence relative to the bottom surface of the reducer 2, the hydraulic pressure of the gear oil inside the reducer 2 will be maintained at the height of the return liquid port 22. The gear transmission structure in the reducer 2 usually includes a high-speed running part located at the top and a part located at the bottom where the speed decreases after transmission. At this time, the height of the return liquid port 22 is between the above-mentioned two parts of the gear transmission structure. The high-speed running part of the gear transmission structure located above the return liquid port 22 can be cooled by the gear oil sprayed from the second liquid inlet 21, while the part located below the return liquid port 22 where the speed decreases after transmission can be soaked by the heat-dissipated gear oil coming in from the first liquid inlet 20. The gear oil coming in from the first liquid inlet 20 can not only cool the part of the gear transmission structure where the speed decreases after transmission, but also ensure the travel of the oil film between its gears, thereby playing a good lubrication and protection role.

[0044] Further, such as Figure 1 As shown, the first liquid inlet 20 and the second liquid inlet 21 are arranged on the same vertical side wall of the reducer 2, while the return liquid port 22 is arranged on the vertical side wall of the reducer 2 opposite to the vertical side wall where the first liquid inlet 20 is located. In this case, the first liquid inlet 20 and the second liquid inlet 21 are respectively spaced relatively far apart from the first liquid inlet 20, thereby achieving a large-area heat dissipation and cooling effect on the gear transmission structure in the reducer 2.

[0045] like Figure 1As shown, the power head system provided in this embodiment also includes a first branch pipe 5 and a first overflow valve 50 . The first branch pipe 5 is connected between the power box 1 and the first liquid pump 3 , and the first overflow valve 50 is installed on the first branch pipe 5 .

[0046] The first overflow valve 50 is used to provide safety protection to prevent accidents caused by excessive pressure in the pipeline between the power box 1 , the reducer 2 and the first liquid pump 3 .

[0047] In this embodiment, the first liquid pump 3 is preferably a gear pump, and the power head system further includes a motor 30 , which is connected to the first liquid pump 3 and is used to drive the first liquid pump 3 to work.

[0048] The motor 30 is used to provide source power for the first liquid pump 3 to enable the first liquid pump 3 to work, and then drive the gear oil in the reducer 2 to flow to the filter 4 and the power box 1 in sequence and then return to the reducer 2.

[0049] Furthermore, the motor 30 is a hydraulic motor 30, such as Figure 1 As shown, the power head system provided in this embodiment also includes a second liquid pump 6 and a liquid medium source 7. The hydraulic motor 30 includes an inlet and an outlet, both of which are connected to the liquid medium source 7 through pipelines, and the second liquid pump 6 is connected to the pipeline between the hydraulic motor 30 and the liquid medium source 7.

[0050] The liquid medium source 7 and the second liquid pump 6 are used to provide source power for the hydraulic motor 30 so that the hydraulic motor 30 can output torque, thereby driving the first liquid pump 3 to work.

[0051] In this embodiment, the liquid medium source 7 is preferably a hydraulic oil tank in the chassis of the rotary drilling rig where the power head system is located. In this case, not only is it not necessary to provide an additional liquid medium source 7 for the power head system, but the first liquid pump 3 can still be driven to work when the power box 1 and the reducer 2 in the power head system are not working, thereby still being able to dissipate heat and filter the gear oil in the reducer 2.

[0052] Furthermore, the reducer 2 and the power box 1 in the power head system of this embodiment are both installed at the original location of the rotary drilling rig, and the filter 4, the first liquid pump 3, and the hydraulic motor 30 can be installed near the power box 1. The liquid medium source 7 and the second liquid pump 6 can both be installed at a location away from the power box 1, such as on the chassis of the rotary drilling rig.

[0053] like Figure 1As shown, the pipeline between the liquid medium source 7 and the inlet of the hydraulic motor 30 is the liquid inlet pipeline 80, and the pipeline between the outlet of the hydraulic motor 30 and the liquid medium source 7 is the liquid outlet pipeline 81. The second liquid pump 6 is connected to the liquid inlet pipeline 80. The power head system also includes a reversing valve 8, which is connected to the liquid inlet pipeline 80 at a position between the second liquid pump 6 and the inlet of the hydraulic motor 30, and the reversing valve 8 is connected to the liquid outlet pipeline 81.

[0054] The reversing valve 8 includes two stations, one of which is used to connect the liquid inlet pipe 80 and the liquid outlet pipe 81 respectively, so as to form a circulation loop between the liquid medium source 7 and the hydraulic motor 30. The other station is used to connect the liquid inlet pipe 80 and the liquid outlet pipe 81.

[0055] When the reversing valve 8 is in the position for connecting the liquid inlet pipe 80 and the liquid outlet pipe 81 respectively, a circulation loop can be formed between the liquid medium source 7 and the hydraulic motor 30. At this time, the second liquid pump 6 can transport the liquid medium in the liquid medium source 7 to the hydraulic motor 30, thereby driving the hydraulic motor 30 to work.

[0056] When the reversing valve 8 is in the position for connecting the liquid inlet pipe 80 and the liquid outlet pipe 81, the circuit between the liquid medium source 7 and the hydraulic motor 30 is blocked. At this time, a circulation loop can be formed between the liquid inlet pipe 80, the liquid outlet pipe 81, the second liquid pump 6 and the liquid medium source 7. The liquid medium in the liquid medium source 7 can only flow out of the liquid medium source 7 under the action of the second liquid pump 6 and then return to the liquid medium source 7, thereby preventing the second liquid pump 6 from being damaged because the liquid medium it pumps cannot flow in the circulation loop.

[0057] When the reversing valve 8 is in the position for connecting the liquid inlet pipe 80 and the liquid outlet pipe 81, the hydraulic motor 30 cannot obtain the liquid medium and thus cannot drive the first liquid pump 3 to work. At this time, the gear oil in the circulation loop between the reducer 2 and the power box 1 cannot circulate, making it convenient to remove the filter 4 from the circulation loop to clean the impurities such as iron filings filtered and intercepted by the filter 4.

[0058] It can be seen that the two positions of the reversing valve 8 are respectively used to control the opening and closing of the hydraulic motor 30, and further control whether the gear oil in the circulation loop between the reducer 2 and the power box 1 can circulate, thereby improving the flexibility of use of the power head system.

[0059] In this embodiment, the reversing valve 8 may be an electromagnetic reversing valve 8 or a hydraulically controlled reversing valve 8 .

[0060] like Figure 1As shown, the power head system provided in this embodiment further includes a speed regulating valve 800 , which is connected to a pipeline between the inlet of the hydraulic motor 30 and the liquid medium source 7 .

[0061] The speed regulating valve 800 is used to adjust the flow of the liquid medium entering the hydraulic motor 30, thereby controlling the rotation speed of the hydraulic motor 30 and the output flow of the first liquid pump 3, thereby flexibly adjusting the filtering effect and the heat dissipation effect.

[0062] like Figure 1 As shown, the power head system provided in this embodiment further includes a second branch pipe 9 and a second overflow valve 90. The second liquid pump 6 includes an inlet and an outlet. The second branch pipe 9 is connected between the outlet of the second liquid pump 6 and the liquid medium source 7. The second overflow valve 90 is installed on the second branch pipe 9.

[0063] The second overflow valve 90 is also used to play a safety protection role to prevent accidents caused by excessive pressure in the liquid inlet pipe 80 and the liquid outlet pipe 81.

[0064] In this embodiment, the second liquid pump 6 is a gear pump. Figure 1 As shown, the power head system provided in this embodiment further includes an engine 60 , which is connected to the second liquid pump 6 for driving the second liquid pump 6 to operate.

[0065] The engine 60 is used to provide power to the second liquid pump 6 so that the second liquid pump 6 can work, and further drive the liquid medium in the liquid medium source 7 to flow to the hydraulic motor 30 .

[0066] Example 2:

[0067] The rotary drilling rig provided in this embodiment includes the power head system in the first embodiment, and thus the rotary drilling rig provided in this embodiment can solve the same technical problems and achieve the same technical effects as the power head system in the first embodiment.

[0068] Therefore, the rotary drilling rig provided in this embodiment can also alleviate the technical problem in the prior art that the gears in the reducer in the power head system of the rotary drilling rig are often in a high-speed operation state, which not only generates a large amount of heat due to friction between the bearings, but also drives impurities such as iron filings in the gear oil to move rapidly, thereby aggravating the wear of the gears, and thus greatly affecting the service life of the reducer.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power head system, characterized in that: The power head system comprises a power box (1), a reducer (2), a first liquid pump (3) and a filter (4); The power box (1) is provided with a liquid inlet (10) and a liquid outlet (11), and the liquid inlet (10) and the liquid outlet (11) of the power box (1) are respectively connected to the reducer (2) through pipelines; The first liquid pump (3) is arranged on a pipeline between the power box (1) and the reducer (2); The filter (4) is installed on the pipeline between the liquid outlet (11) of the power box (1) and the reducer (2); The reducer (2) is provided with a first liquid inlet (20), a second liquid inlet (21) and a liquid return port (22) in sequence, and relative to the bottom surface of the reducer (2), the heights of the first liquid inlet (20), the liquid return port (22) and the second liquid inlet (21) of the reducer (2) increase in sequence; The first liquid inlet (20) and the second liquid inlet (21) are both connected to the liquid outlet (11) on the power box (1) through a pipeline; the liquid return port (22) of the reducer (2) is connected to the liquid inlet (10) on the power box (1) through a pipeline; The gear transmission structure in the reducer includes a high-speed running part located at the top and a part located at the bottom whose speed becomes slower after transmission. The height of the return liquid port is located between the above two parts of the gear transmission structure.

2. The power head system according to claim 1, characterized in that: The power head system further includes a first branch pipeline (5) and a first overflow valve (50); The first branch pipe (5) is connected between the power box (1) and the first liquid pump (3), and the first overflow valve (50) is installed on the first branch pipe (5).

3. The power head system according to claim 1 or 2, characterized in that: The first liquid pump (3) is a gear pump, and the power head system further comprises a motor (30). The motor (30) is connected to the first liquid pump (3) and is used to drive the first liquid pump (3) to work.

4. The power head system according to claim 3, characterized in that: The motor (30) is a hydraulic motor (30), and the power head system further comprises a second liquid pump (6) and a liquid medium source (7); The hydraulic motor (30) includes an inlet and an outlet, both of which are connected to the liquid medium source (7) through a pipeline, and the second liquid pump (6) is connected to the pipeline between the hydraulic motor (30) and the liquid medium source (7).

5. The power head system according to claim 4, characterized in that: The pipeline between the liquid medium source (7) and the inlet of the hydraulic motor (30) is a liquid inlet pipeline (80), and the pipeline between the outlet of the hydraulic motor (30) and the liquid medium source (7) is a liquid outlet pipeline (81); the second liquid pump (6) is connected to the liquid inlet pipeline (80); The power head system further comprises a reversing valve (8), the reversing valve (8) being connected to a position of the liquid inlet pipe (80) between the second liquid pump (6) and the inlet of the hydraulic motor (30), and the reversing valve (8) being connected to the liquid outlet pipe (81); The reversing valve (8) includes two workstations, one of which is used to connect the liquid inlet pipe (80) and the liquid outlet pipe (81) respectively, so as to form a circulation loop between the liquid medium source (7) and the hydraulic motor (30); and the other workstation is used to connect the liquid inlet pipe (80) and the liquid outlet pipe (81).

6. The power head system according to claim 4, characterized in that: The power head system further comprises a speed regulating valve (800), wherein the speed regulating valve (800) is connected to a pipeline between the inlet of the hydraulic motor (30) and the liquid medium source (7).

7. The power head system according to claim 4, characterized in that: The power head system further includes a second branch pipeline (9) and a second overflow valve (90); The second liquid pump (6) comprises an inlet and an outlet, and the second branch pipe (9) is connected between the outlet of the second liquid pump (6) and the liquid medium source (7); The second overflow valve (90) is installed on the second branch pipe (9).

8. The power head system according to claim 4, characterized in that: The second liquid pump (6) is a gear pump, and the power head system further comprises an engine (60), which is connected to the second liquid pump (6) and is used to drive the second liquid pump (6) to work.

9. A rotary drilling rig, characterized in that: The rotary drilling rig comprises the power head system according to any one of claims 1-8.

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