A rotary drilling rig main winch and power head control hydraulic system and rotary drilling rig

Abstract

The utility model provides a kind of rotary drilling rig main winch and power head control hydraulic system, when hoist motor is promoted, liquid control valve disconnects the reverse pilot oil path of reverse hand pilot valve to first valve core, the reverse pilot oil path of reverse hand pilot valve to second valve core keeps passage, hoist hand pilot valve to hoist distribution valve core's hoist pilot oil path keeps passage;Second working pump is used to deliver working oil to second valve core, and second valve core exports working oil to power head motor;First working pump and second working pump all deliver working oil to hoist distribution valve core, and hoist distribution valve core exports working oil to hoist motor.The utility model hydraulic system, by additionally adding liquid control valve, it is realized when hoist is promoted, control the number of valve core that working oil is supplied to power head, avoid too much working oil to enter power head, to solve the problem that the drill pipe is mentioned in background art and promoted slowly even powerless.

Description

Technical Field

[0001] This utility model belongs to the field of rotary drilling rig technology, specifically relating to a main winch and power head control hydraulic system for a rotary drilling rig and the rotary drilling rig itself. Background Technology

[0002] Rotary drilling rigs are engineering machines that efficiently and effectively drill large, deep, and straight cylindrical holes in the ground. Compared with traditional circulating drilling rigs, rotary drilling rigs have significant advantages such as faster hole-forming speed, better hole-forming quality, less environmental pollution, and greater mobility.

[0003] When a rotary drilling rig is working, if the drill rod is heavily sludge-adsorbed when the main winch lifts it upwards after one drilling stroke, it will be unable to lift directly. In this case, it is necessary to rotate (reverse) the power head while lifting the drill rod. In traditional rotary drilling rigs, when the main winch and the power head move at the same time, the power head has low resistance while the main winch has high lifting resistance. As a result, the working oil flow delivered by the distribution valve will mainly supply the power head, causing the drill rod to lift slowly or even weakly. Utility Model Content

[0004] One of the objectives of this utility model is to provide a hydraulic control system for the main winch and power head of a rotary drilling rig. By adding a hydraulic control valve, the number of valve cores supplying working oil to the power head can be controlled during winch lifting, thus preventing excessive working oil from entering the power head and solving the problem of slow or even weak drill rod lifting mentioned in the background art.

[0005] The second objective of this utility model is to provide a rotary drilling rig that uses the aforementioned main winch and power head control hydraulic system, enabling the rotary drilling rig to quickly lift the drill bit when performing winch lifting tasks.

[0006] To achieve the above objectives, this utility model discloses a hydraulic control system for the main winch and power head of a rotary drilling rig, including a return oil tank, an oil tank, a pilot pump, a first working pump, a second working pump, a manual pilot valve, a distribution valve, a power head motor, a winch motor, and a hydraulic control valve; the inlet of the pilot pump, the inlet of the first working pump, and the inlet of the second working pump are all connected to the oil tank;

[0007] The distribution valve includes a power head distribution valve core and a hoist distribution valve core; the power head distribution valve core includes at least a first valve core and a second valve core, the first working pump is used to deliver working oil to the first valve core, the first valve core outputs working oil to the power head motor, the second working pump is used to deliver working oil to the second valve core, and the second valve core outputs working oil to the power head motor.

[0008] The manual pilot valve is connected to the outlet of the pilot pump, and the manual pilot valve includes a reverse manual pilot valve; the reverse manual pilot valve is configured to control the on / off of the reverse pilot oil passage from the pilot pump to the power head distribution valve core;

[0009] The manual pilot valve also includes a lifting manual pilot valve; the lifting manual pilot valve is configured to control the on / off of the lifting pilot oil passage from the pilot pump to the winch distribution valve core;

[0010] The hydraulic control valve is located in the reverse pilot oil circuit of the first valve core and is used to control the opening and closing of the reverse manual pilot valve to the reverse pilot oil circuit of the first valve core.

[0011] When the hoist motor is lifting, the hydraulic control valve disconnects the reverse pilot oil circuit from the reverse hand pilot valve to the first valve core, while the reverse pilot oil circuit from the reverse hand pilot valve to the second valve core remains open.

[0012] As an optional implementation, the hydraulic control valve is connected to the hoisting hand pilot valve. When the hoisting motor lifts, part of the pilot oil output by the hoisting hand pilot valve enters the hydraulic control valve. When the hydraulic control valve is closed, the reverse pilot oil circuit from the reverse hand pilot valve to the first valve core is disconnected, and part of the pilot oil output by the hoisting hand pilot valve enters the hoisting distribution valve core.

[0013] As an optional implementation, a throttle valve is also included, the throttle valve comprising a full-load passage and a throttling passage; the second valve core is connected to the outlet of the second working pump through the throttle valve;

[0014] The pilot oil port of the throttle valve is connected to the hoisting hand pilot valve. When the hoisting motor performs the hoisting action, part of the pilot oil output by the hoisting hand pilot valve enters the throttle valve and controls the throttle valve to operate in a throttle path.

[0015] As an optional implementation, the manual pilot valve further includes a forward manual pilot valve; the forward manual pilot valve is configured to control the on / off state of the forward pilot oil circuit from the pilot pump to the power head distribution valve spool.

[0016] As an optional implementation, the manual pilot valve further includes a descent manual pilot valve; the descent manual pilot valve is configured to control the opening and closing of the descent pilot oil passage from the pilot pump to the winch valve core.

[0017] As an optional implementation, the hoisting distribution valve core includes a fourth valve core and a fifth valve core, wherein the first working pump is used to deliver working oil to the fifth valve core, and the second working pump is used to deliver working oil to the fourth valve core.

[0018] As an optional implementation, the working oil output from both the fourth valve core and the fifth valve core directly enters the hoist motor.

[0019] As an optional implementation, when the power head motor performs rotary drilling, the working oil output from the first valve core and the working oil output from the second valve core are combined in the distribution valve and then output to the power head motor.

[0020] As an optional implementation, the power head distribution valve core further includes a third valve core, wherein when the power head motor performs rotary drilling, the working oil output by the third valve core directly enters the power head motor.

[0021] A rotary drilling rig includes a power head, a winch, and the aforementioned main winch and power head control hydraulic system; the power head motor drives the power head to rotate, and the winch motor drives the winch to lift.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] 1. By adding a hydraulic control valve, when the winch is being lifted, the hydraulic control valve controls the partial power head distribution valve core to close, reducing the number of power head distribution valve cores that supply working oil to the power head motor. Even if all the hydraulic oil supplied by the first working pump enters the winch motor through the winch distribution valve core, the working oil flow rate distributed to the winch motor by the distribution valve is greater than the working oil flow rate distributed to the power head motor, ensuring the power of the winch motor and ensuring smooth winch lifting.

[0024] 2. The rotary drilling rig of this utility model adopts the aforementioned main winch and power head control hydraulic system of the rotary drilling rig, which makes the rotary drilling rig have the advantages of high working efficiency, precise rotary drilling stroke and fast rotary drilling. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is an example diagram of a hydraulic system for controlling the main winch and power head of a rotary drilling rig.

[0027] Figure 2 for Figure 1 A magnified view of a portion of the image.

[0028] Figure 3 This is a diagram of one embodiment of a distribution valve.

[0029] Figure 4 Diagram showing the working status of the main winch and power head control hydraulic system of the rotary drilling rig when the power head is rotating forward.

[0030] Figure 5 This diagram shows the working status of the main winch and the hydraulic control system of the rotary drilling rig when the power head reverses.

[0031] Figure 6 Diagram showing the working status of the main winch and power head control hydraulic system of the rotary drilling rig during hoisting.

[0032] Figure 7 Diagram showing the working status of the main winch and power head control hydraulic system of the rotary drilling rig during winch descent.

[0033] Explanation of key figure labels:

[0034] 1. Power head manual pilot valve; 2. Winch manual pilot valve; 3. Second working pump; 4. First working pump; 5. Pilot pump; 6. Third valve core; 7. Fifth valve core; 8. First valve core; 9. Winch motor; 10. Power head motor; 11. Throttle valve; 12. Second valve core; 13. Hydraulic control valve; 14. Fourth valve core; 15. Oil tank; 16. Return oil tank; 17. Manual pilot valve. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0037] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0038] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0039] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0040] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0041] Please see Figures 1 to 7 As shown in the embodiment of this application, a hydraulic system for controlling the main winch and power head of a rotary drilling rig is provided.

[0042] See Figure 1 and Figure 2 In one embodiment, the hydraulic system for controlling the main winch and power head of the rotary drilling rig includes a return oil tank 16, an oil tank 15, a pilot pump 5, a first working pump 4, a second working pump 3, a manual pilot valve 17, a distribution valve, a power head motor 10, a winch motor 9, and a hydraulic control valve 13.

[0043] The inlet of the pilot pump 5, the inlet of the first working pump 4, and the inlet of the second working pump 3 are all connected to the oil tank 15.

[0044] The distribution valve includes a power head distribution valve core and a hoist distribution valve core. The power head distribution valve core includes at least a first valve core 8 and a second valve core 12. A first working pump 4 is used to supply working oil to the first valve core 8, and the first valve core 8 outputs working oil to the power head motor 10. A second working pump 3 is used to supply working oil to the second valve core 12, and the second valve core 12 outputs working oil to the power head motor 10.

[0045] The manual pilot valve 17 is connected to the outlet of the pilot pump 5, and the manual pilot valve includes a reverse manual pilot valve; the reverse manual pilot valve is configured to control the on / off of the reverse pilot oil circuit from the pilot pump 5 to the power head distribution valve spool.

[0046] The manual pilot valve 17 also includes a lifting manual pilot valve; the lifting manual pilot valve is configured to control the opening and closing of the lifting pilot oil passage from the pilot pump 5 to the winch valve core.

[0047] The hydraulic control valve 13 is located in the reverse pilot oil circuit of the first valve core 8 and is used to control the opening and closing of the reverse pilot valve to the reverse pilot oil circuit of the first valve core 8.

[0048] When the hoist motor 9 is lifting, the hydraulic control valve 13 disconnects the reverse pilot oil circuit from the reverse hand pilot valve to the first valve core 8, while the reverse pilot oil circuit from the reverse hand pilot valve to the second valve core 12 remains open.

[0049] When the hoist motor 9 is lifting, after the hydraulic control valve 13 disconnects the reverse pilot oil circuit from the reverse hand pilot valve to the first valve core 8, and the reverse pilot oil circuit from the reverse hand pilot valve to the second valve core 12 remains open, the lifting pilot oil circuit from the lifting hand pilot valve to the hoist distribution valve core remains open; the second working pump 3 is used to supply working oil to the second valve core 12, and the second valve core 12 outputs working oil to the power head motor 10; both the first working pump 4 and the second working pump 3 supply working oil to the hoist distribution valve core, and the hoist distribution valve core outputs working oil to the hoist motor 9.

[0050] When the hoist motor 9 is lifting, the hydraulic control valve closes, meaning it cuts off the pilot oil circuit from the pilot pump to the first valve core of the power head distribution valve. Part of the pilot oil delivered by the pilot pump 5 passes through the lifting manual pilot valve of the manual pilot valve, and then is output to the hoist distribution valve core, controlling it to be in the lifting working position. Part of the pilot oil delivered by the pilot pump 5 passes through the reversing manual pilot valve of the manual pilot valve, and then is output to the second valve core of the power head distribution valve, controlling it to be in the reversing working position. At this time, all the working oil output by the first working pump enters the hoist distribution valve core and supplies the hoist motor. Part of the working oil output by the second working pump enters the hoist distribution valve core to supply the hoist motor, and the other part enters the second valve core to supply the power head motor, while the first valve core has no working oil output.

[0051] In summary, when the winch motor 9 is lifting, the pilot oil circuit of the first valve core of the power head distribution valve is cut off by the hydraulic control valve. This prevents the working oil from the first working pump from being supplied to the power head motor through the first valve core. Only a portion of the working oil delivered by the second working pump is supplied to the power head motor through the second valve core, while all the working oil delivered by the first working pump is supplied to the winch distribution valve core. Additionally, a portion of the working oil output by the second working pump is also supplied to the winch motor through the winch distribution valve core. By adding the hydraulic control valve, the working oil flow within the distribution valve is distributed during the lifting of the winch motor 9, actively reducing the working oil flow allocated to the power head motor and ensuring the working oil flow supplied to the winch motor. This ensures the lifting power of the winch motor and also ensures that the power head motor reverses when the winch motor is lifting, thus guaranteeing the lifting power of the winch motor.

[0052] Only by additionally arranging a hydraulic control valve, when the hoisting motor 9 is lifting, the hydraulic control valve is used to control the cutting-off of the reversing pilot oil path of the first valve spool, so that the control of the working oil flow distributed by the distributing valve can be realized, which enables the hydraulic system for controlling the main hoist and the power head of the rotary drilling rig to have low cost and wide adaptability.

[0053] In some embodiments, the hydraulic control valve 13 is connected with the lifting manual pilot valve, when the hoisting motor 9 is lifting, part of the pilot oil output by the lifting manual pilot valve enters the hydraulic control valve 13 to control the hydraulic control valve 13 to close, and disconnects the reversing pilot oil path from the reversing manual pilot valve to the first valve spool 8, and part of the pilot oil output by the lifting manual pilot valve enters the hoisting distributing valve spool.

[0054] The pilot oil is controlled by the lifting manual pilot valve to enter the hydraulic control valve 13, so as to control and close the hydraulic control valve, that is, cut off the reversing pilot oil path from the reversing manual pilot valve to the first valve spool, so as to control that when the hoisting motor 9 is lifting, the first valve spool does not deliver hydraulic oil to the power head motor. Through the hydraulic oil delivered by the lifting manual pilot valve, linkage control of the hydraulic control valve is realized, the hydraulic system for controlling the main hoist and the power head of the rotary drilling rig is simplified, the cost is reduced, and the control process is simplified.

[0055] In some embodiments, the hydraulic system for controlling the main hoist and the power head of the rotary drilling rig further comprises a throttle valve 11, the throttle valve 11 comprises a full-load passage and a throttling passage; the second valve spool 12 is connected with the outlet of the second working pump 3 through the throttle valve. The pilot port of the throttle valve 11 is connected with the lifting manual pilot valve, and when the hoisting motor 9 performs a lifting action, part of the pilot oil output by the lifting manual pilot valve enters the throttle valve and controls the throttle valve to work via the throttling passage.

[0056] By arranging the throttle valve 11, when the hoisting motor 9 is lifting, the throttle valve 11 further controls the flow of working oil delivered by the second working pump to the second valve spool, reduces the amount of working oil entering the power head motor, that is, indirectly increases the flow of working oil entering the hoisting motor, so as to ensure the lifting power of the hoisting motor.

[0057] In some embodiments, the manual pilot valve further comprises a forward rotation manual pilot valve; the forward rotation manual pilot valve is configured to control the on-off of the forward rotation pilot oil path from the pilot pump 5 to the power head distributing valve spool. The on-off of the forward rotation pilot oil path and the reversing pilot oil path are respectively controlled by the forward rotation manual pilot valve and the reversing manual pilot valve, the control logic is simple, and the failure rate is low during the working process of the control system.

[0058] Refer to Figure 1 and Figure 2 , in some embodiments, the manual pilot valve 17 comprises a hoisting manual pilot valve 2, and the hoisting manual pilot valve 2 comprises a lifting manual pilot valve and a lowering manual pilot valve. The lifting manual pilot valve is configured to control the on-off of the lifting pilot oil path from the pilot pump 5 to the distributing valve. The lowering manual pilot valve is configured to control the on-off of the lowering pilot oil path from the pilot pump 5 to the distributing valve.

[0059] When the lifting pilot valve is activated as needed, the pilot pump 5 delivers pilot oil into the distribution valve, controlling the distribution valve to deliver working oil to the lifting port of the winch motor 9. When the lowering pilot valve is activated as needed, the pilot pump 5 delivers pilot oil into the distribution valve, controlling the distribution valve to deliver working oil to the lowering port of the winch motor 9.

[0060] The lowering pilot valve is configured to control the on / off state of the lowering pilot oil circuit from the pilot pump 5 to the winch valve core. The lowering pilot valve and the lifting pilot valve control the lowering pilot oil circuit and the lifting pilot oil circuit of the winch valve core, respectively, simplifying the control logic.

[0061] In some embodiments, the winch distribution valve core includes a fourth valve core 14 and a fifth valve core 7. A first working pump 4 supplies working oil to the fifth valve core 7, and a second working pump 3 supplies working oil to the fourth valve core 14. The fourth valve core 14 and the fifth valve core 7 respectively supply hydraulic oil output from the second working pump and the first working pump, ensuring that when the winch motor is lifting, all the working oil output from the first working pump can enter the winch motor through the fifth valve core, ensuring the lifting power of the winch motor.

[0062] See Figure 2 In one embodiment, the distribution valve further includes a fourth valve core 14 and a fifth valve core 7. A second working pump 3 supplies working oil to the fourth valve core 14. A first working pump 4 supplies working oil to the fifth valve core 7. Both the fourth valve core 14 and the fifth valve core 7 directly output working oil from the distribution valve and directly into the hoist motor 9.

[0063] Both the fourth valve core 14 and the fifth valve core 7 directly output the working oil to the distribution valve and directly enter the winch motor 9 to drive the winch to lift or lower, ensuring the winch's lifting capacity.

[0064] The working oil output from the fourth valve core 14 and the fifth valve core 7 directly enters the winch motor 9. This increases the inner diameter of the hydraulic system pipeline controlling the main winch and power head of the rotary drilling rig, reduces the flow velocity, reduces pressure loss, saves energy, and improves the efficiency of the hydraulic system.

[0065] In some embodiments, when the power head motor 10 performs rotary drilling, the working oil output by the first valve core 8 and the working oil output by the second valve core 12 merge in the distribution valve and are then output to the power head motor 10.

[0066] Both the first valve core 8 and the second valve core 12 are located inside the distribution valve, reducing the volume of the distribution valve and facilitating the installation and control of the first valve core 8 and the second valve core 12.

[0067] The first valve core 8 and the second valve core 12 output working oil and merge in the distribution valve, and then enter the power head motor 10, which facilitates the setting and control of the working oil circuit and simplifies the oil circuit.

[0068] In some embodiments, the power head distribution valve core further includes a third valve core 6, and when the power head motor 10 performs rotary drilling, the working oil output by the third valve core 6 directly enters the power head motor 10.

[0069] The hydraulic oil output from the first distribution valve does not merge with other oil circuits within the distribution valve. Instead, it is directly output from the distribution valve and then directly enters the power head motor 10, causing the motor to rotate. This effectively avoids the working oil pressure loss caused by the merging of the working oil output from the third valve core 6 within the distribution valve.

[0070] The working oil flows together within the distribution valve. Due to the limited size of the internal oil passages in the distribution valve, coupled with the long overall hydraulic pipeline of the rotary drilling rig and the excessively high flow rate, the working oil experiences significant pressure loss along the flow path. In the hydraulic system controlling the main winch and power head of the rotary drilling rig, a third valve core 6 is added within the distribution valve. The working oil output from the third valve core 6 is directly discharged from the distribution valve and then directly enters the power head motor 10, driving the power head motor 10 to rotate. In other words, the working oil does not flow together but directly drives the power head, thus solving the problem of insufficient power for the power head's rotation. Furthermore, the working oil delivered by the third valve core 6 achieves external flow merging outside the distribution valve, increasing the pipeline inner diameter and reducing the flow rate, thereby reducing pressure loss, saving energy, and improving the efficiency of the hydraulic system.

[0071] See Figures 1 to 3 An example of the hydraulic system for controlling the main winch and power head of a rotary drilling rig is presented below, and the main control process of this system is described below.

[0072] When the power head motor 10 rotates forward, the main control process of the main winch and power head control hydraulic system of this rotary drilling rig is as follows.

[0073] See Figure 4 Pilot pump 5, first working pump 4 and second working pump 3 are started. At the same time, the forward hand pilot valve is opened, while the reverse hand pilot valve, lifting hand pilot valve and lowering hand pilot valve are all closed.

[0074] The working oil delivered by the pilot pump 5 enters the hydraulic control valve 13 through the forward-rotating pilot valve, and then, through the forward-rotating hydraulic control valve of the hydraulic control valve 13, enters the third valve core 6 and the first valve core 8, driving the third valve core 6 to operate in the right position and pushing the first valve core 8 to operate in the left position. The fourth valve core 14 and the fifth valve core 7 are both in the neutral position. At the same time, some of the pilot oil passing through the forward-rotating pilot valve directly enters the second valve core 12 before passing through the hydraulic control valve 13, pushing the second valve core 12 to operate in the left position.

[0075] The working oil delivered by the first working pump 4 passes through check valve V1 and check valve V2 in sequence and enters the third valve core 6. The third valve core 6 outputs working oil and enters the power head motor 10 through the forward rotation oil port of the power head motor 10, driving the power head motor 10 to rotate forward.

[0076] Meanwhile, the remaining portion of the working oil delivered by the first working pump 4 passes through check valve V1 and check valve V4 in sequence and enters the first valve core 8. The first valve core 8 outputs working oil, which then enters the power head motor 10 through the forward rotation port of the power head motor 10, driving the power head motor 10 to rotate forward.

[0077] Meanwhile, the working oil delivered by the second working pump 3 passes through the middle position of the fourth valve core 14 to the check valve C6, and then enters the second valve core 12 through the check valve C6. After being output by the second valve core 12 and merging with the working oil output by the first valve core 8, it enters the power head motor 10 through the forward rotation port of the power head motor 10, driving the power head motor 10 to rotate forward.

[0078] Meanwhile, the remaining portion of the working oil delivered by the first working pump 4 passes through the check valve C2, the full-load passage of the throttle valve 11 and the check valve C5 in sequence, enters the second valve core 12, and after being output by the second valve core 12 and merged with the working oil output by the first valve core 8, it enters the power head motor 10 through the forward rotation port of the power head motor 10, driving the power head motor 10 to rotate forward.

[0079] When the power head motor 10 reverses, the main control process of the main winch and power head control hydraulic system of this rotary drilling rig is as follows.

[0080] See Figure 5 Pilot pump 5, first working pump 4 and second working pump 3 are started. At the same time, the reverse hand pilot valve is opened, while the forward hand pilot valve, lifting hand pilot valve and lowering hand pilot valve are all closed.

[0081] The working oil delivered by the pilot pump 5 enters the hydraulic control valve 13 through the reverse pilot valve, and then, through the reverse hydraulic control valve of the hydraulic control valve 13, enters the third valve core 6 and the first valve core 8, driving the third valve core 6 to operate in the left position and pushing the first valve core 8 to operate in the right position. The fourth valve core 14 and the fifth valve core 7 are both in the neutral position. At the same time, some of the pilot oil that has passed through the reverse pilot valve enters the second valve core 12 directly before passing through the hydraulic control valve 13, pushing the second valve core 12 to operate in the right position.

[0082] The working oil delivered by the first working pump 4 passes through check valve V1 and check valve V2 in sequence and enters the third valve core 6. The third valve core 6 outputs working oil and enters the power head motor 10 through the reverse oil port of the power head motor 10, driving the power head motor 10 to reverse.

[0083] Meanwhile, the remaining portion of the working oil delivered by the first working pump 4 passes through check valve V1 and check valve V4 in sequence and enters the first valve core 8. The first valve core 8 outputs working oil and enters the power head motor 10 through the reverse oil port of the power head motor 10, driving the power head motor 10 to reverse.

[0084] Meanwhile, the working oil delivered by the second working pump 3 passes through the middle position of the fourth valve core 14 to the check valve C6, and then enters the second valve core 12 through the check valve C6. After being output by the second valve core 12 and merging with the working oil output by the first valve core 8, it enters the power head motor 10 through the reverse oil port of the power head motor 10, driving the power head motor 10 to reverse.

[0085] Meanwhile, the remaining portion of the working oil delivered by the first working pump 4 passes through the one-way valve C2, the full-load passage of the throttle valve 11 and the one-way valve C5 in sequence, enters the second valve core 12, and after being output by the second valve core 12 and merged with the working oil output by the first valve core 8, it enters the power head motor 10 through the reverse oil port of the power head motor 10, driving the power head motor 10 to reverse.

[0086] When the winch motor 9 is lifting, the main control process of the hydraulic system controlling the main winch and power head of this rotary drilling rig is as follows.

[0087] See Figure 6 Pilot pump 5, first working pump 4 and second working pump 3 are started. At the same time, the lifting pilot valve and the reversing pilot valve are opened, while the forward and lowering pilot valves are closed.

[0088] The pilot oil delivered by pilot pump 5 passes through the lifting hand pilot valve. A portion of the pilot oil passing through the lifting hand pilot valve enters the hydraulic control valve 13 and drives it to open, causing the third valve core 6 and the second distribution valve to be in the neutral position. A portion of the pilot oil passing through the lifting hand pilot valve also enters the fourth valve core 14 and the fifth valve core 7, driving the fourth valve core 14 to operate in the left position and the fifth valve core 7 to operate in the right position, respectively. The remaining pilot oil passing through the lifting hand pilot valve enters the throttle valve 11, driving the overflow passage of the throttle valve 11 to open.

[0089] The pilot oil delivered by the pilot pump 5 passes through the reverse hand pilot valve and then directly enters the second valve core 12, pushing the second valve core 12 to work in the right position.

[0090] The working oil delivered by the first working pump 4 passes through the check valve V1 and the check valve V3 in sequence, and then all enters the fifth valve core 7. The working oil output from the fifth valve core 7 enters the hoisting motor 9 through the lifting port of the hoisting motor 9, driving the hoisting motor 9 to lift the drill rod.

[0091] The working oil delivered by the first working pump 4 partially passes through check valves C2 and C3 in sequence and enters the fourth valve core 14. The working oil output from the fourth valve core 14 enters the hoisting motor 9 through the lifting port of the hoisting motor 9, driving the hoisting motor 9 to lift the drill rod.

[0092] The working oil delivered by the first working pump 4, the remaining part of which passes through the overflow channel of the one-way valve C2, the one-way valve 11 and the one-way valve C5, enters the second valve core 12. The working oil output by the second valve core 12 enters the power head motor 10 through the reverse oil port of the power head motor 10, driving the power head motor 10 to reverse.

[0093] When the winch motor 9 descends, the main control process of the hydraulic system controlling the main winch and power head of this rotary drilling rig is as follows.

[0094] See Figure 7 Pilot pump 5, first working pump 4, and second working pump 3 start, and simultaneously the lowering pilot valve opens, while the forward, reverse, and lifting pilot valves are all closed. The third valve core 6, first valve core 8, and second valve core 12 are all in the neutral position because no pilot oil enters them.

[0095] The pilot oil delivered by the pilot pump 5 passes through the reverse hand pilot valve and then directly enters the fourth valve core 14 and the fifth valve core 7, pushing the fourth valve core 14 to work in the right position and pushing the fifth valve core 7 to work in the left position.

[0096] The working oil delivered by the first working pump 4 passes through the check valve V1 and the check valve V3 in sequence, and then all enters the fifth valve core 7. The working oil output from the fifth valve core 7 enters the winch motor 9 through the lowering oil port, driving the winch motor 9 to lower the drill rod.

[0097] The working oil delivered by the first working pump 4 passes through check valves C2 and C3 in sequence and enters the fourth valve core 14. The working oil output from the fourth valve core 14 enters the winch motor 9 through the lowering oil port of the winch motor 9, driving the winch motor 9 to lower the drill rod.

[0098] See Figure 3 In one embodiment, the third valve core 6 includes a pilot cavity D0 and a pilot cavity D9. The pilot cavity D0 is connected to the reverse pilot oil circuit of the power head motor 10, and the pilot cavity D9 is connected to the forward pilot oil circuit of the power head motor 10.

[0099] It is understood that, in one embodiment, the pilot oil in the reverse pilot oil circuit of the power head motor 10 enters the pilot chamber D0 of the third valve core 6. At this time, the working oil output by the third valve core 6 enters the power head motor 10 through the reverse oil port of the power head motor 10, driving the power head motor 10 to reverse.

[0100] In one embodiment, the pilot oil in the forward rotation pilot oil circuit of the power head motor 10 enters the pilot chamber D9 of the third valve core 6. At this time, the working oil output by the third valve core 6 enters the power head motor 10 through the forward rotation oil port of the power head motor 10, driving the power head motor 10 to rotate forward.

[0101] See Figure 3In one embodiment, the third valve core 6 has a first working position, a second working position, and a neutral position. The first valve core includes oil ports D1, D3, D5, D7, D2, D4, D6, and D8. Oil port D3 is connected to the outlet of the second working pump 3, oil port D5 is connected to the outlet of the second working pump 3 through check valves V1 and V2, and oil port D5 is connected to the return oil tank 16.

[0102] When the third valve core 6 is in the neutral position, oil port D3 is connected to oil port D4.

[0103] See Figure 5 When the pilot oil in the reverse pilot oil circuit enters the pilot chamber D0 of the third valve core 6, driving the third valve core 6 to the first working position, that is, as Figure 3 When the third valve core 6 is in the left position, oil ports D5 and D6 are connected to supply working oil to the reverse oil port of the power head motor 10, and oil ports D7 and D8 are connected to realize the return oil of the power head motor 10.

[0104] See Figure 4 When the pilot oil in the forward pilot oil circuit enters the pilot chamber D9 of the third valve core 6, it drives the third valve core 6 to the second working position, i.e. Figure 3 When the third valve core 6 is in the right position, oil port D5 and oil port D8 are connected to supply working oil to the reverse oil port of the power head motor 10, and oil port D7 and oil port D6 are connected to realize the return oil of the power head motor 10.

[0105] The working oil output from port D6 or port D8 of the third valve core 6 is directly discharged from the distribution valve and then directly enters the reverse rotation port or the forward rotation port of the power head motor 10, thereby driving the power head motor 10 to rotate in reverse or forward. At this time, the working oil output from port D6 or port D8 of the third valve core 6 will not merge with the working oil output from other valve cores of the distribution valve, shortening the oil path of the working oil output from the third valve core 6 and avoiding pressure loss along the path. By increasing the working oil delivered by the third valve core 6, the inner diameter of the hydraulic system pipeline for the main winch and power head control of the rotary drilling rig is increased to reduce the flow velocity, thereby reducing pressure loss, saving energy, and improving the efficiency of the hydraulic system.

[0106] See Figure 1 and Figure 2 In one embodiment, the first valve core 8 and the second valve core 12 are both disposed inside the distribution valve, reducing the volume of the distribution valve and facilitating the installation and control of the first valve core 8 and the second valve core 12.

[0107] The first valve core 8 and the second valve core 12 output working oil and merge in the distribution valve, and then enter the power head motor 10, which facilitates the setting and control of the working oil circuit and simplifies the oil circuit.

[0108] See Figure 3In one embodiment, the first valve core 8 includes a pilot chamber F0 and a pilot chamber F9. The pilot chamber F0 is connected to the forward rotation pilot oil circuit of the power head motor 10. The pilot chamber F9 is connected to the reverse rotation pilot oil circuit of the power head motor 10.

[0109] See Figure 3 In one embodiment, the first valve core 8 has a first working position, a second working position, and a neutral position, and the second valve core includes oil ports F1, F3, F5, F2, F4, and F6. Oil port F5 is connected to the return oil tank 16, and oil port F3 is connected to the outlet of the second working pump 3 through a one-way valve V4.

[0110] When the first valve core 8 is in the neutral position, oil port F1 is connected to oil port F2.

[0111] In the forward rotation pilot oil circuit, pilot oil enters the pilot chamber F0, pushing the first valve core 8 to operate in the first working position, i.e. Figure 4 When the first valve core 8 is in the left position, oil port F3 and oil port F4 are connected to supply working oil to the forward rotation oil port of the power head motor 10; oil port F5 and oil port F6 are connected to realize the return oil of the power head motor 10.

[0112] When the pilot oil in the reverse pilot oil circuit enters the pilot chamber F9, it pushes the first valve core 8 to operate in the second working position, i.e. Figure 5 When the first valve core 8 is in the right position, oil port F3 and oil port F6 are connected to supply working oil to the reverse oil port of the power head motor 10; oil port F5 and oil port F4 are connected to realize the return oil of the power head motor 10.

[0113] See Figure 3 In one embodiment, the second valve core 12 includes a pilot chamber B0 and a pilot chamber B9. The pilot chamber B0 is connected to the forward rotation pilot oil circuit of the power head motor 10, and the pilot chamber B9 is connected to the reverse rotation pilot oil circuit of the power head motor 10.

[0114] See Figure 3 In one embodiment, the second valve core 12 has a first working position, a second working position, and a neutral position. The third valve core includes oil ports B1, B3, B5, B7, B2, B4, B6, and B8. Oil port B1 is connected to the return oil tank 16. Oil port B3 is connected to oil port A6 of the fourth valve core 14 via a check valve C6. Oil port B5 is connected to oil port A6 of the fourth valve core 14. Oil port B3 is connected to the outlet of the second working pump 3 in sequence via check valve C5, throttle valve 11, and check valve C2.

[0115] When the second valve core 12 is in the neutral position, oil port B5 is connected to oil port B6.

[0116] Pilot oil enters the pilot chamber B0 in the forward pilot oil circuit, pushing the second valve core 12 to operate in the first working position, i.e. Figure 4 When the second valve core 12 is in the left position, oil port B1 is connected to oil port B2 to realize the return oil of the power head motor 10; oil port B3 is connected to oil port B4 to deliver working oil to the forward rotation oil port of the power head motor 10.

[0117] When the pilot oil in the reverse pilot oil circuit enters the pilot chamber B9, it pushes the second valve core 12 to operate in the second working position, i.e. Figure 5 The second valve core 12 operates in the right position. At this time, oil port B1 is connected to oil port B4 to realize the return oil of the power head motor 10; oil port B3 is connected to oil port B2 to deliver working oil to the reverse oil port of the power head motor 10.

[0118] The working oil output from port B2 of the second valve core 12 and port F6 of the first valve core 8 converges in the distribution valve and is then discharged from the valve port of the distribution valve. Finally, it enters the reverse oil port of the power head motor, driving the power head motor 10 to reverse.

[0119] The working oil output from port B4 of the second valve core 12 and port F4 of the first valve core 8 converges in the distribution valve and is then discharged from the valve port of the distribution valve. Finally, it enters the forward rotation port of the power head motor, driving the power head motor 10 to rotate forward.

[0120] See Figure 3 In one embodiment, the fourth valve core 14 includes a pilot cavity A0 and a pilot cavity A9. The pilot cavity A0 is connected to the lifting pilot oil circuit of the hoisting motor 9, and the pilot cavity A9 is connected to the lowering pilot oil circuit of the hoisting motor 9.

[0121] See Figure 3 In one embodiment, the fourth valve core 14 includes a first working position, a second working position, and a neutral position. The fourth valve core 14 also includes oil ports A1, A3, A5, A7, A2, A4, A6, and A8. Oil port A1 is connected to the return oil tank 16. Oil port A3 is connected to the outlet of the second working pump 3 via check valves C3 and C2. Oil port A5 is directly connected to the outlet of the second working pump 3. Oil port A2 is connected to the lowering port of the hoisting motor 9. Oil port A4 is connected to the lifting port of the hoisting motor 9. Oil port A6 is directly connected to the oil port B5 of the second valve core 12, and is connected to the oil port B5 of the second valve core 12 via check valve C6.

[0122] When the fourth valve core 14 is in the neutral position, oil port A5 is connected to oil port A6.

[0123] See Figure 6 The pilot oil in the pilot oil circuit is raised to enter the pilot chamber A0 of the fourth valve core 14, pushing the fourth valve core 14 to work in the first working position, that is, as Figure 6The fourth valve core 14 is in the left position. At this time, the oil port A3 of the fourth valve core 14 is connected to the oil port A4 to deliver working oil to the lifting oil port of the hoisting motor 9. The oil port A1 is connected to the oil port A2 to realize the return oil of the hoisting motor 9.

[0124] See Figure 7 The pilot oil in the lowering pilot oil circuit enters the pilot chamber A9 of the fourth valve core 14, pushing the fourth valve core 14 to operate in the second working position, that is, as... Figure 7 The fourth valve core 14 is in the right position. At this time, the oil port A3 of the fourth valve core 14 is connected to the oil port A2 to supply working oil to the lowering oil port of the hoisting motor 9. The oil port A1 is connected to the oil port A4 to realize the return oil of the hoisting motor 9.

[0125] See Figure 3 In one embodiment, the fifth valve core 7 includes a pilot cavity E0 and a pilot cavity E9. The pilot cavity E0 is connected to the lowering pilot oil circuit of the hoisting motor 9, and the pilot cavity E9 is connected to the lifting pilot oil circuit of the hoisting motor 9.

[0126] See Figure 3 In one embodiment, the fifth valve core 7 includes a first working position, a second working position, and a neutral position. The fifth valve core 7 also includes oil ports E1, E3, E5, E7, E2, E4, E6, and E8. Oil port E7 is connected to the return oil tank 16; oil port E3 is directly connected to oil port D4 of the third valve core 6; oil port E5 is connected to the outlet of the second working pump 3 via a one-way valve V3; oil port E4 is directly connected to oil port F1 of the first valve core 8; oil port E6 is connected to the lowering oil port of the hoisting motor 9; and oil port E8 is connected to the lifting oil port of the hoisting motor 9.

[0127] When the fifth valve core 7 is in the neutral position, oil port E7, oil port E6, and oil port E8 are all connected, and oil port E3 and oil port E4 are connected.

[0128] See Figure 6 In one embodiment, pilot oil in the pilot oil circuit is raised and enters the pilot chamber E9 of the fifth valve core 7, pushing the fifth valve core 7 to operate in the second working position, i.e. Figure 6 The fifth valve core 7 is in the right-hand working state. At this time, the oil port E5 of the fifth valve core 7 is connected to the oil port E8 to deliver working oil to the lifting oil port of the hoisting motor 9. The oil port E7 is connected to the oil port E6 to realize the return oil of the hoisting motor 9.

[0129] See Figure 7 In one embodiment, pilot oil in the descending pilot oil path enters the pilot chamber E0 of the fifth valve core 7, pushing the fifth valve core 7 to operate in the first working position, i.e. Figure 7The fifth valve core 7 is in the left position. At this time, the oil port E5 of the fifth valve core 7 is connected to the oil port E6 to supply working oil to the lowering oil port of the hoisting motor 9. The oil port E7 is connected to the oil port E8 to realize the return oil of the hoisting motor 9.

[0130] However, during rotary drilling, when the drill rod completes one drilling stroke and the winch lifts it upwards, if the drill rod is heavily coated with mud, the winch may not be able to lift it properly. In this case, it is necessary to simultaneously lift the drill rod and rotate the power head (reverse power head). When the winch and power head operate simultaneously, due to the lower resistance of the power head and the higher lifting resistance of the winch, the hydraulic oil will primarily supply the power head, resulting in slow or even weak drill rod lifting. To solve this problem, a hydraulic control valve 13 is installed in the hydraulic control system of the main winch and power head of the rotary drilling rig. When the winch motor 9 lifts the drill rod, the hydraulic control valve 13 controls the number of valve cores involved in the operation of the distribution valve, specifically the number of valve cores supplying hydraulic oil to the power head motor 10. This prevents excessive hydraulic oil from entering the power head motor 10 and avoids insufficient hydraulic oil flow into the winch motor 9, which would result in insufficient lifting power from the winch motor 9.

[0131] See Figure 1 and Figure 2 In one embodiment, the hydraulic control valve 13 includes a forward hydraulic control valve and a reverse hydraulic control valve.

[0132] The forward rotation hydraulic control valve is installed in the forward rotation pilot oil circuit and is used to control the opening and closing of the forward rotation pilot oil circuit from the forward rotation manual pilot valve to the third valve core 6 and the first valve core 8.

[0133] The reverse hydraulic control valve is installed in the reverse pilot oil circuit and is used to control the opening and closing of the reverse pilot oil circuit from the reverse manual pilot valve to the third valve core 6 and the first valve core 8.

[0134] Both the forward and reverse hydraulic control valves are connected to the lifting pilot valve. Pilot oil in the lifting pilot oil circuit enters the forward and reverse hydraulic control valves. The forward hydraulic control valve cuts off the forward pilot oil circuit from the forward pilot valve to the third valve core 6 and the first valve core 8, and the reverse hydraulic control valve cuts off the reverse pilot oil circuit from the reverse pilot valve to the third valve core 6 and the first valve core 8.

[0135] By raising the pilot oil in the pilot oil circuit to enter the forward hydraulic control valve and the reverse hydraulic control valve, the forward hydraulic control valve and the reverse hydraulic control valve can be cut off simultaneously. That is, the forward pilot oil circuit passing through the forward hydraulic control valve and the reverse pilot oil circuit passing through the reverse hydraulic control valve are cut off simultaneously.

[0136] Pilot oil passing through the forward-rotating hydraulic control valve enters the pilot chamber D9 of the third valve core 6 and the pilot chamber F0 of the first valve core 8. The forward-rotating hydraulic control valve is disconnected, meaning that pilot oil does not enter the pilot chamber D9 of the third valve core 6 and the pilot chamber F0 of the first valve core 8.

[0137] When the pilot oil of the reverse hydraulic control valve enters the pilot chamber D0 of the third valve core 6 and the pilot chamber F0 of the first valve core 8, the reverse hydraulic control valve is disconnected, that is, the pilot chamber D0 of the third valve core 6 and the pilot chamber F9 of the first valve core 8 do not enter the pilot oil.

[0138] After both the forward and reverse hydraulic control valves are simultaneously disconnected, no pilot oil enters either the third valve core 6 or the first valve core 8, and both valve cores remain in the neutral position. That is, neither valve core 6 nor the first valve core 8 supplies working oil to the power head motor 10, allowing the hydraulic oil supplied by the first working pump 4 and the second working pump 3 to primarily enter the winch motor 9, ensuring the lifting power of the winch motor 9 and ensuring the drill pipe is smoothly lifted.

[0139] In this embodiment, it is necessary to ensure that the second valve core 12 includes pilot chamber B0 and pilot chamber B9. Pilot chamber B0 is directly connected to the outlet of the forward manual pilot valve, and pilot chamber B9 is directly connected to the outlet of the reverse manual pilot valve. The second valve core 12 is directly connected to the forward and reverse manual pilot valves, meaning that the pilot oil from the forward and reverse manual pilot valves can directly enter the second valve core 12, controlling the second valve core 12 to supply working oil to the power head motor 10. The pilot oil controlling the operation of the second valve core 12 does not pass through the hydraulic control valve 13. That is, when the winch motor 9 performs lifting, the reverse manual pilot valve can be operated synchronously to ensure that the drill pipe has an appropriate reverse speed during lifting. This ensures the smooth lifting of the drill pipe, avoids the problem of the drill pipe being difficult to lift due to mud and sand, and also avoids the excessive working oil flow rate distributed to the power head motor 10 during drill pipe lifting, which affects the lifting capacity of the winch motor 9.

[0140] See Figure 1 and Figure 2 In one embodiment, the hydraulic control valve 13 can achieve the control that the first valve core and the third valve core do not participate in the operation when the hoisting motor is lifting, even with only one passage. That is, the hydraulic control valve is set in the reverse pilot oil circuit of the first valve core and the third valve core, and when the hoisting motor is lifting, it controls the reverse hand pilot valve to disconnect the reverse pilot oil circuit of the first valve core and the third valve core, so that the first valve core and the third valve core will not deliver the working oil output by the first working pump to the power head motor.

[0141] A rotary drilling rig includes a power head, a winch, and the aforementioned main winch and power head control hydraulic system. The power head motor 10 drives the power head to rotate, and the winch motor 9 drives the winch to lift and lower. This ensures that the winch motor 9 provides sufficient lifting power to quickly raise the drill bit during drill bit lifting. This rotary drilling rig offers advantages such as high working efficiency, precise rotary drilling stroke, and rapid rotary drilling.

[0142] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A hydraulic control system for the main winch and power head of a rotary drilling rig, characterized in that, It includes a return oil tank, an oil tank, a pilot pump, a first working pump, a second working pump, a manual pilot valve, a distribution valve, a power head motor, a winch motor, and a hydraulic control valve; the inlet of the pilot pump, the inlet of the first working pump, and the inlet of the second working pump are all connected to the oil tank; The distribution valve includes a power head distribution valve core and a hoist distribution valve core; the power head distribution valve core includes at least a first valve core and a second valve core, the first working pump is used to deliver working oil to the first valve core, the first valve core outputs working oil to the power head motor, the second working pump is used to deliver working oil to the second valve core, and the second valve core outputs working oil to the power head motor. The manual pilot valve is connected to the outlet of the pilot pump, and the manual pilot valve includes a reverse manual pilot valve; the reverse manual pilot valve is configured to control the on / off of the reverse pilot oil passage from the pilot pump to the power head distribution valve core; The manual pilot valve also includes a lifting manual pilot valve; the lifting manual pilot valve is configured to control the on / off of the lifting pilot oil passage from the pilot pump to the winch distribution valve core; The hydraulic control valve is located in the reverse pilot oil circuit of the first valve core and is used to control the opening and closing of the reverse manual pilot valve to the reverse pilot oil circuit of the first valve core. When the hoist motor is lifting, the hydraulic control valve disconnects the reverse pilot oil circuit from the reverse hand pilot valve to the first valve core, while the reverse pilot oil circuit from the reverse hand pilot valve to the second valve core remains open.

2. The hydraulic system for controlling the main winch and power head of the rotary drilling rig according to claim 1, characterized in that, The hydraulic control valve is connected to the hoisting hand pilot valve. When the hoisting motor lifts, part of the pilot oil output by the hoisting hand pilot valve enters the hydraulic control valve. When the hydraulic control valve closes, the reverse pilot oil circuit from the reverse hand pilot valve to the first valve core is disconnected, and part of the pilot oil output by the hoisting hand pilot valve enters the hoisting distribution valve core.

3. The hydraulic system for controlling the main winch and power head of the rotary drilling rig according to claim 1 or 2, characterized in that, It also includes a throttle valve, which includes a full-load passage and a throttling passage; the second valve core is connected to the outlet of the second working pump through the throttle valve; The pilot oil port of the throttle valve is connected to the hoisting hand pilot valve. When the hoisting motor performs the hoisting action, part of the pilot oil output by the hoisting hand pilot valve enters the throttle valve and controls the throttle valve to operate in a throttle path.

4. The hydraulic system for controlling the main winch and power head of the rotary drilling rig according to claim 1, characterized in that, The manual pilot valve also includes a forward manual pilot valve; the forward manual pilot valve is configured to control the on / off of the forward pilot oil circuit from the pilot pump to the power head distribution valve core.

5. The hydraulic system for controlling the main winch and power head of the rotary drilling rig according to claim 1, characterized in that, The manual pilot valve also includes a descent manual pilot valve; the descent manual pilot valve is configured to control the on / off of the descent pilot oil passage from the pilot pump to the winch distribution valve core.

6. The hydraulic system for controlling the main winch and power head of the rotary drilling rig according to claim 1, characterized in that, The hoisting distribution valve core includes a fourth valve core and a fifth valve core. The first working pump is used to deliver working oil to the fifth valve core, and the second working pump is used to deliver working oil to the fourth valve core.

7. The hydraulic system for controlling the main winch and power head of the rotary drilling rig according to claim 6, characterized in that, The working oil output from the fourth valve core and the fifth valve core both directly enter the hoist motor.

8. The hydraulic system for controlling the main winch and power head of the rotary drilling rig according to claim 1, characterized in that, When the power head motor performs rotary drilling, the working oil output from the first valve core and the working oil output from the second valve core are combined in the distribution valve and then output to the power head motor.

9. The hydraulic system for controlling the main winch and power head of the rotary drilling rig according to claim 1, characterized in that, The power head distribution valve core also includes a third valve core, and when the power head motor performs rotary drilling, the working oil output by the third valve core directly enters the power head motor.

10. A rotary drilling rig, characterized in that, It includes a power head, a winch, and a main winch and power head control hydraulic system for a rotary drilling rig as described in any one of claims 1 to 9; the power head motor drives the power head to rotate, and the winch motor drives the winch to lift.

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