Rotary drilling rig hoist hydraulic system and control method and storage medium

Abstract

The application discloses a rotary drilling rig hoist hydraulic system, a rotary drilling rig hoist control method and a storage medium, and the rotary drilling rig hoist hydraulic system comprises a main pump, a main valve, a hoist motor, an oil tank, a first main oil path, a second main oil path and a pilot oil path, the pilot oil path comprises a pilot pump, a pilot oil supply oil path, a pilot oil return oil path, a pilot valve group and a pilot control oil path, a first reversing valve is arranged on the pilot oil supply oil path to adjust the flow rate of the pilot oil supply oil path flowing into the pilot valve group, and a second reversing valve is arranged on the pilot oil return oil path to adjust the flow rate of the pilot valve group returning oil through the pilot oil return oil path. In the rotary drilling rig hoist hydraulic system, the rotary drilling rig hoist control method and the storage medium, the valve core of the main valve can be slowly opened and closed, the opening and closing impact is reduced, the hoist motor is started and stopped stably, the flow rate can be restored to normal when soil is thrown, and the normal function of soil throwing is ensured.

Description

Technical Field

[0001] This application relates to the field of basic construction technology, and in particular to a rotary drilling rig winch hydraulic system, a rotary drilling rig winch control method, and a storage medium. Background Technology

[0002] Rotary drilling rigs are construction machines suitable for hole-forming operations in building foundation engineering. They are mainly suitable for construction in soil layers such as sand, cohesive soil, and silty soil. They are widely used in various foundation constructions such as cast-in-place piles, continuous walls, and foundation reinforcement. They generally adopt hydraulic crawler telescopic chassis, self-lifting foldable drill mast, telescopic drill rod, automatic vertical detection and adjustment, and digital display of hole depth. The whole machine is generally operated by hydraulic pilot control and load sensing, and features easy and comfortable operation.

[0003] The rapid soil-throwing mechanism of the power head relies on the quick forward and reverse switching of the winch motor. The higher the winch motor speed and the shorter the switching time, the higher the soil-throwing efficiency. The pressure oil supplied by the main pump drives the winch motor, which in turn drives the winch to lift and lower the drill rod. However, during start-up and shutdown, if the valve core reversing speed is too fast, the winch motor experiences pressure shock, affecting the smoothness of drill rod start-up and shutdown, and consequently impacting the overall operability of the machine. Conversely, if the valve core reversing speed is too slow, it will affect the main unit's soil-throwing function. Therefore, in the existing system, improving the smoothness of drill rod start-up and shutdown and enhancing the main unit's soil-throwing function are contradictory. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a rotary drilling rig winch hydraulic system, a rotary drilling rig winch control method and storage medium, which can ensure the smooth start and stop of the winch motor without weakening the soil shaking function of the main unit.

[0005] To achieve the above objectives, this application provides a rotary drilling rig winch hydraulic system, including a main pump, a main valve, a winch motor, an oil tank, a first main oil circuit, a second main oil circuit, and a pilot oil circuit. The main pump supplies oil to the winch motor through the main valve, which is connected to the first and second main oil circuits. The pilot oil circuit controls the state of the main valve to control the main pump to supply oil to the winch motor through either the first or second main oil circuit. The pilot oil circuit includes a pilot pump, a pilot oil supply circuit, and a pilot return circuit. The system includes an oil circuit, a pilot valve assembly, and a pilot control oil circuit. The pilot pump is connected to the pilot valve assembly via the pilot supply oil circuit. The pilot valve assembly is connected to the oil tank via the pilot return oil circuit. The pilot control oil circuit is connected between the pilot valve assembly and the control terminal of the main valve to control the state of the main valve. A first directional valve is provided on the pilot supply oil circuit to regulate the flow rate of the pilot supply oil flowing into the pilot valve assembly. A second directional valve is provided on the pilot return oil circuit to regulate the flow rate of the pilot valve assembly returning oil through the pilot return oil circuit.

[0006] Optionally, the control terminal of the main valve includes a first control terminal and a second control terminal, both of which are connected to the pilot valve assembly. The pilot pump is used to supply oil to the first control terminal and the second control terminal of the main valve through the pilot valve assembly to control the switching state of the main valve.

[0007] Optionally, the pilot valve assembly includes a first pilot valve and a second pilot valve. Both the first pilot valve and the second pilot valve include a first pilot port, a second pilot port, and a third pilot port. The first pilot port is selectively connected to either the second pilot port or the third pilot port. The pilot oil supply circuit is connected to the second pilot port of the first pilot valve and the second pilot valve. The pilot oil return circuit is connected to the third pilot port of the first pilot valve and the second pilot valve. The pilot control circuit includes a first pilot control circuit and a second pilot control circuit. The first pilot control circuit is used to connect the first pilot port of the first pilot valve to the first control terminal of the main valve. The second pilot control circuit is used to connect the first pilot port of the second pilot valve to the second control terminal of the main valve.

[0008] Optionally, the main valve includes a first main valve port, a second main valve port, a third main valve port, and a fourth main valve port. The first main valve port is connected to the main pump, the second main valve port is connected to the oil tank, the third main valve port is connected to the first end of the winch motor via the first main oil circuit, and the fourth main valve port is connected to the second end of the winch motor via the second main oil circuit. The main valve also includes a first position, a second position, and a third position. In the first position, the first main valve port, the second main valve port, the third main valve port, and the fourth main valve port are disconnected from each other. In the second position, the first main valve port and the fourth main valve port are connected, and the second main valve port and the third main valve port are connected. In the third position, the first main valve port and the third main valve port are connected, and the second main valve port and the fourth main valve port are connected. The pilot valve group is used to control the main valve to switch between the first position, the second position, and the third position.

[0009] Optionally, the first directional valve can switch between two states: directly connecting the pilot oil supply circuit and connecting the pilot oil supply circuit through a throttle port; the second directional valve can switch between two states: directly connecting the pilot return oil circuit and connecting the pilot return oil circuit through a throttle port.

[0010] Optionally, both the first and second directional control valves are solenoid valves; both the first and second directional control valves include a first reversing port and a second reversing port, and both the first and second directional control valves include a fourth position and a fifth position. In the fourth position, the first and second reversing ports are directly connected, and in the fifth position, the first and second reversing ports are connected through a throttle port. The switching between the fourth and fifth positions is achieved by energizing or de-energizing the first or second directional control valve.

[0011] Optionally, the pilot oil circuit further includes an overflow valve, one end of which is connected to the pilot oil supply circuit and the other end of which is connected to the oil tank.

[0012] This application also provides a rotary drilling rig winch control method for controlling a rotary drilling rig having the above-mentioned rotary drilling rig winch hydraulic system, the rotary drilling rig winch control method comprising:

[0013] The control handle begins to operate;

[0014] Determine whether the valve core of the pilot valve group has a displacement change. If so, determine whether the time between two adjacent displacement reversals of the valve core of the pilot valve group is less than or equal to a preset time threshold. If not, control the first reversing valve and the second reversing valve to switch to a state with a smaller flow rate.

[0015] When the time between two adjacent displacement switching of the valve core of the pilot valve group is less than or equal to a preset time threshold, the first switching valve and the second switching valve are controlled to switch to a state with a larger flow rate. When the time between two adjacent displacement switching of the valve core of the pilot valve group is greater than the preset time threshold, it is determined whether the valve core of the pilot valve group moves to the initial position.

[0016] When the valve core of the pilot valve assembly moves to the initial position, the first and second directional valves are controlled to switch to a lower flow rate. When the valve core of the pilot valve assembly does not move to the initial position, the first directional valve is controlled to switch to a lower flow rate, and the second directional valve is controlled to switch to a higher flow rate.

[0017] Optionally, when the valve core of the pilot valve assembly does not move to the initial position, the second directional valve is controlled to switch to a state with a larger flow rate and a preset time is recorded, and then the second directional valve is controlled to switch to a state with a smaller flow rate.

[0018] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of any of the methods described above.

[0019] As described above, in the rotary drilling rig winch hydraulic system, rotary drilling rig winch control method and storage medium of this application, the flow rate in the pilot oil circuit can be adjusted by setting a first reversing valve and a second reversing valve. During normal operation, the flow rate output from the pilot valve to the main valve control end can be reduced, thereby allowing the valve core of the main valve to open and close slowly, reducing the opening and closing impact, achieving smooth start and stop of the winch motor, and at the same time, restoring the flow rate to normal during soil dumping, ensuring the normal operation of the soil dumping function. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a rotary drilling rig winch hydraulic system provided in an embodiment of this application.

[0022] Figure 2 This diagram illustrates the comparison of the time required for the main valve spool to achieve the same displacement when the first and second directional valves are in different states.

[0023] Figure 3 This is a flowchart illustrating a rotary drilling rig winch control method according to an embodiment of this application. Detailed Implementation

[0024] The specific embodiments of this application will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of this application. Based on the description of this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0025] In the description of this application, unless otherwise expressly specified and limited, the terms "set," "install," "connect," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms based on the specific circumstances.

[0026] The terms “first,” “second,” “third,” etc., are used merely to distinguish numerical values ​​or elements with similar properties, and do not indicate or imply relative importance or a specific order.

[0027] The terms “include,” “comprising,” or any other variation thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0028] Figure 1 This is a schematic diagram of the structure of a rotary drilling rig winch hydraulic system provided in one embodiment of this application. Figure 1 As shown, one embodiment of the rotary drilling rig's winch hydraulic system includes a main pump 11, a main valve 13, a winch motor 15, an oil tank 17, a first main oil circuit 19, a second main oil circuit 21, and a pilot oil circuit. The main pump 11 supplies oil to the winch motor 15 through the main valve 13. The main valve 13 is connected to the first main oil circuit 19 and the second main oil circuit 21. The pilot oil circuit controls the state of the main valve 13 to control the main pump 11 to supply oil to the winch motor 15 through the first main oil circuit 19 or the second main oil circuit 21. The pilot oil circuit includes a pilot pump 23, a pilot oil supply circuit 25, a pilot oil return circuit 27, a pilot valve assembly 29, and a pilot control circuit. The pilot pump 23 is connected to the pilot valve assembly 29 via the pilot oil supply circuit 25. The pilot valve assembly 29 is connected to the oil tank 17 via the pilot oil return circuit 27. The pilot control circuit is connected between the pilot valve assembly 29 and the control terminal of the main valve 13 to control the state of the main valve 13. A first directional valve 31 is provided on the pilot oil supply circuit 25 to regulate the flow rate of oil flowing from the pilot oil supply circuit 25 into the pilot valve assembly 29. A second directional valve 33 is provided on the pilot oil return circuit 27 to regulate the flow rate of oil returning from the pilot valve assembly 29 through the pilot oil return circuit 27.

[0029] In the rotary drilling rig winch hydraulic system of this embodiment, the flow rate in the pilot oil circuit can be adjusted by setting a first reversing valve and a second reversing valve. During normal operation, the flow rate output from the pilot valve to the main valve control end can be reduced, thereby allowing the valve core of the main valve to open and close slowly, reducing the impact of opening and closing, and realizing smooth start and stop of the winch motor. At the same time, it can restore the flow rate to normal when throwing soil, ensuring the normal operation of the soil shaking function.

[0030] In this embodiment, the main valve 13 includes a first main valve port 131, a second main valve port 132, a third main valve port 133, and a fourth main valve port 134. The first main valve port 131 is connected to the main pump 11, the second main valve port 132 is connected to the oil tank 17, the third main valve port 133 is connected to the first end of the winch motor 15 through the first main oil passage 19, and the fourth main valve port 134 is connected to the second end of the winch motor 15 through the second main oil passage 21. The main valve 13 also includes a first (i.e., Figure 1 The median), the second (i.e.) Figure 1 The left position) and the third position (i.e. Figure 1 (Right position). In the first position, the first main valve port 131, the second main valve port 132, the third main valve port 133, and the fourth main valve port 134 are disconnected from each other; in the second position, the first main valve port 131 and the fourth main valve port 134 are connected, and the second main valve port 132 and the third main valve port 133 are connected; in the third position, the first main valve port 131 and the third main valve port 133 are connected, and the second main valve port 132 and the fourth main valve port 134 are connected. During operation, the main pump 11 starts to supply pressurized oil. When the main valve 13 is in the first position, the pressurized oil cannot enter the winch motor 15, and the winch motor 15 does not work. When the main valve 13 is in the second position, the pressurized oil supplied by the main pump 11 passes through the first main valve port 131, the fourth main valve port 134, and the second main oil passage 21 to reach the second end of the winch motor 15, allowing the winch motor 15 to lower the drill pipe. Simultaneously, after passing through the winch motor 15, the oil flows from the first end through the first main oil passage 19 and the third main valve port 15. Oil flows back to the oil tank 17 via port 133 and port 132 of the second main valve, achieving oil return. When the main valve 13 is in the third position, the pressurized oil provided by the main pump 11 passes through port 131 of the first main valve, port 133 of the third main valve, and the first main oil passage 19 to the first end of the winch motor 15. The winch motor 15 can lift the drill pipe, and at the same time, the oil flows back to the oil tank 17 from the second end of the winch motor 15 via the second main oil passage 21, port 133 of the fourth main valve, and port 132 of the second main valve, achieving oil return. It can be understood that it can also be set so that when the pressurized oil flows from the first end to the second end of the winch motor 15, it is lowering the drill pipe, and when the pressurized oil flows from the second end to the first end of the winch motor 15, it is lifting the drill pipe.

[0031] Specifically, the control terminals of the main valve 13 include a first control terminal and a second control terminal, both of which are connected to the pilot valve assembly 29. When the oil output from the pilot valve assembly 29 reaches the first control terminal, the valve core of the main valve 13 can move to the right, switching the main valve 13 to the second position (or the first position). When the oil output from the pilot valve assembly 29 reaches the second control terminal, the valve core of the main valve 13 can move to the left, switching the main valve 13 to the third position (or the first position).

[0032] In this embodiment, the pilot valve assembly 29 includes a first pilot valve 291 and a second pilot valve 292. Both the first pilot valve 291 and the second pilot valve 292 include a first pilot port 294, a second pilot port 295, and a third pilot port 296. The first pilot port 294 is selectively connected to either the second pilot port 295 or the third pilot port 296. The pilot oil supply passage 25 is connected to the second pilot port 295 of the first pilot valve 291 and the second pilot valve 292. The pilot oil return passage 27 is connected to the third pilot port 296 of the first pilot valve 291 and the second pilot valve 292. The pilot control oil circuit includes a first pilot control oil circuit 351 and a second pilot control oil circuit 353. The first pilot control oil circuit 351 is used to connect the first pilot port 294 of the first pilot valve 291 and the first control terminal of the main valve 13. The second pilot control oil circuit 353 is used to connect the first pilot port 294 of the second pilot valve 292 and the second control terminal of the main valve 13. In the initial state, i.e., when the operating handle 51 is not operated, the first pilot port 294 and the third pilot port 296 are connected, and the pressure oil provided by the pilot pump 23 will not be output to the control end of the main valve 13 through the pilot valve assembly 29, and the main valve 13 does not operate; when the operating handle 51 is operated, taking the operation of the first pilot valve 291 as an example, pressing the left side of the operating handle 51 switches the state of the first pilot valve 291, connecting the first pilot port 294 and the second pilot port 295, and the hydraulic oil provided by the pilot pump 23 passes through the pilot oil supply circuit 25, the first directional valve 31, the second pilot port 295, and the first pilot valve 296. The pilot valve 294 and the first pilot control oil circuit 351 reach the first control end of the main valve 13, causing the valve core of the main valve 13 to move to the right, and the main valve 13 can switch to the second position. When the operating handle 51 is released, the first pilot valve 291 returns to its initial state, connecting the first pilot port 294 and the third pilot port 296. The oil at the first control end of the main valve 13 can flow back to the oil tank 17 through the first pilot control oil circuit 351, the first pilot port 294, the third pilot port 296, the pilot return oil circuit 27, and the second directional valve 33, realizing oil return. At this time, the main valve 13 can switch to the first position depending on whether oil is entering the second control end. Similarly, when the second pilot valve 292 is operated, the main valve 13 can switch to the third position.

[0033] In this embodiment, the first directional valve 31 can switch between two states: directly connecting the pilot oil supply line 25 and connecting the pilot oil supply line 25 through a throttle orifice; the second directional valve 33 can switch between two states: directly connecting the pilot return oil line 27 and connecting the pilot return oil line 27 through a throttle orifice. The throttle orifice allows some oil to overflow.

[0034] Specifically, both the first reversing valve 31 and the second reversing valve 33 can be solenoid valves. Both the first reversing valve 31 and the second reversing valve 33 include a first reversing port 311 and a second reversing port 312, and both the first reversing valve 31 and the second reversing valve 33 include a fourth position (i.e., Figure 1 The leftmost position and the fifth position (i.e.) Figure 1 In the fourth position (rightmost position), the first reversing port 311 and the second reversing port 312 are directly connected; in the fifth position, the first reversing port 311 and the second reversing port 312 are connected through a throttling port. The first reversing valve 31 or the second reversing valve 33 can be switched between the fourth and fifth positions by energizing or de-energizing it. Specifically, in this embodiment, the first reversing valve 31 or the second reversing valve 33 is in the fifth position when it is de-energized, and in the fourth position when it is energized.

[0035] Specifically, when the first reversing valve 31 and the second reversing valve 33 are in the fourth position, the flow rate entering the control end of the main valve 13 through the pilot valve assembly 29 and the return oil flow rate through the pilot valve assembly 29 are relatively large, enabling the soil-shaking function; when in the fifth position, the flow rate entering the control end of the main valve 13 through the pilot valve assembly 29 and the return oil flow rate through the pilot valve assembly 29 decrease, allowing the valve core of the main valve 13 to open and close slowly, achieving smooth start and stop of the hoisting motor. Please refer to... Figure 2 The diagram shows a comparison of the time required for the main valve 13 to move the same displacement when the first reversing valve 31 and the second reversing valve 33 are in different states. In the fourth position, the main valve 13 needs time t2 to move a displacement of x1. In the fifth position, the main valve 13 needs time t1 to move a displacement of x1. Since t1>t2, it indicates that the main valve 13 needs less time to move the same displacement in the fourth position compared to the fifth position.

[0036] In this embodiment, the pilot oil circuit also includes a relief valve 37. One end of the relief valve 37 is connected to the pilot oil supply circuit 25, and the other end is connected to the oil tank 17 to achieve overflow. In particular, when the first directional valve 31 is in the fifth position, the portion of oil reduced by the throttling of the first directional valve 31 will overflow through the relief valve 37.

[0037] This application also provides a winch control method for a rotary drilling rig, used to control a rotary drilling rig equipped with the aforementioned winch hydraulic system. Please refer to [reference needed]. Figure 3 One embodiment of the rotary drilling rig winch control method includes:

[0038] S11, the control handle begins to operate.

[0039] S13, determine whether there is a displacement change in the valve core of the pilot valve assembly 29. If yes, proceed to step S15; otherwise, proceed to step S17. Specifically, when the operating handle is operated, the displacement change of the valve core of the pilot valve assembly 29 can be detected.

[0040] S15: Determine whether the time between two adjacent displacement reversals of the pilot valve assembly 29 is less than or equal to a preset time threshold △T. If yes, proceed to step S19; otherwise, proceed to step S21. Specifically, valve core displacement reversal refers to the time consumed by the valve core in the previous direction of movement when the valve core displacement changes from one direction to another. If the time between two adjacent displacement reversals of the valve core is less than or equal to the time threshold △T, it indicates that the operator is performing a soil-shaking action. At this time, the first reversing valve 31 and the second reversing valve 33 can be switched to the fourth position, so that the pilot oil supply circuit 25 and the pilot oil return circuit 27 are directly connected, allowing the main valve 13 to quickly reverse and realize the soil-shaking function. If the time between two adjacent displacement reversals of the valve core is greater than the time threshold △T, it indicates that the operator is not performing a soil-shaking action.

[0041] S17, control the first reversing valve 31 and the second reversing valve 33 to the fifth position, that is, control the first reversing valve 31 and the second reversing valve 33 to switch to the state with a smaller flow rate.

[0042] S19, control the first reversing valve 31 and the second reversing valve 33 to the fourth position, that is, control the first reversing valve 31 and the second reversing valve 33 to switch to the state with a larger flow rate.

[0043] S21, determine whether the valve core of the pilot valve group 29 has moved to the initial position, that is, determine whether the main valve 13 has disconnected the main pump 11 from the hoisting motor 15, and the oil tank 17 from the hoisting motor 15. If yes, proceed to step S17; if no, proceed to step S23. Specifically, if the valve core of the pilot valve group 29 moves to the initial position, it indicates that the operator is about to stop the hoisting action. At this time, the first reversing valve 31 and the second reversing valve 33 switch to the fifth position. At this time, the oil at the first control end and the second control end of the main valve 13 will pass through the pilot valve group 29, the second reversing valve 33 or flow back to the oil tank 17. The pilot return oil circuit 27 is opened through the throttle port, so that the oil at the control end slowly flows back to the oil tank 17, thereby causing the main valve 13 to slowly return to the neutral position and the hoisting motor 15 to stop smoothly. If the valve core of pilot valve assembly 29 does not move to its initial position, it indicates that the operator needs to raise or lower the winch. In this case, the first directional valve 31 can be switched to position five, and the second directional valve 33 to position four. Pilot oil supply circuit 25 is opened through the throttle port, and pilot oil return circuit 27 is directly opened, causing the main valve 13 to slowly reverse, allowing the winch motor 15 to smoothly raise or lower the drill rod. Furthermore, the oil at one control end of the main valve 13 flows quickly back to the oil tank 17, preventing pressure buildup and obstruction of the main valve 13's reversal. The initial position of the valve core of pilot valve assembly 29 refers to the position of the valve cores of the first pilot valve 291 and the second pilot valve 292 of pilot valve assembly 29 when the operating handle is not operated.

[0044] S23, control the first directional valve 31 to the fifth position and control the second directional valve 33 to the fourth position, and start timing.

[0045] S25, after the preset time T is reached, the first directional valve 31 is controlled to the fourth position. Specifically, the length of time T can be preset as needed.

[0046] This application also provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the method described above.

[0047] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the appended claims.

Claims

1. A winch hydraulic system for a rotary drilling rig, characterized in that, The system includes a main pump (11), a main valve (13), a hoisting motor (15), an oil tank (17), a first main oil circuit (19), a second main oil circuit (21), and a pilot oil circuit. The main pump (11) supplies oil to the hoisting motor (15) through the main valve (13). The main valve (13) is connected to the first main oil circuit (19) and the second main oil circuit (21). The pilot oil circuit controls the state of the main valve (13) to control the main pump (11) to supply oil to the hoisting motor (15) through the first main oil circuit (19) or the second main oil circuit (21). The pilot oil circuit includes a pilot pump (23), a pilot oil supply circuit (25), a pilot oil return circuit (27), and a pilot valve assembly (28). 9) and pilot control oil circuit, the pilot pump (23) is connected to the pilot valve group (29) through the pilot oil supply oil circuit (25), the pilot valve group (29) is connected to the oil tank (17) through the pilot oil return oil circuit (27), the pilot control oil circuit is connected between the pilot valve group (29) and the control end of the main valve (13) to control the state of the main valve (13), the pilot oil supply oil circuit (25) is provided with a first reversing valve (31) to adjust the flow rate of the pilot oil supply oil circuit (25) into the pilot valve group (29), the pilot oil return oil circuit (27) is provided with a second reversing valve (33) to adjust the flow rate of the pilot valve group (29) returning oil through the pilot oil return oil circuit (27); The control terminals of the main valve (13) include a first control terminal and a second control terminal. Both the first control terminal and the second control terminal are connected to the pilot valve group (29). The pilot pump (23) is used to supply oil to the first control terminal and the second control terminal of the main valve (13) through the pilot valve group (29) to control the switching state of the main valve (13). The pilot valve assembly (29) includes a first pilot valve (291) and a second pilot valve (292). Both the first pilot valve (291) and the second pilot valve (292) include a first pilot port (294), a second pilot port (295), and a third pilot port (296). The first pilot port (294) is selectively connected to either the second pilot port (295) or the third pilot port (296). The pilot oil supply circuit (25) is connected to the second pilot port (295) of both the first pilot valve (291) and the second pilot valve (292). The pilot oil return circuit (25) is... 7) The third pilot port (296) connected to the first pilot valve (291) and the second pilot valve (292) is a pilot control oil circuit including a first pilot control oil circuit (351) and a second pilot control oil circuit (353). The first pilot control oil circuit (351) is used to connect the first pilot port (294) of the first pilot valve (291) and the first control terminal of the main valve (13). The second pilot control oil circuit (353) is used to connect the first pilot port (294) of the second pilot valve (292) and the second control terminal of the main valve (13). The first reversing valve (31) can switch between two states: directly connecting the pilot oil supply line (25) and connecting the pilot oil supply line (25) through a throttle port; the second reversing valve (33) can switch between two states: directly connecting the pilot return oil line (27) and connecting the pilot return oil line (27) through a throttle port.

2. The rotary drilling rig winch hydraulic system as described in claim 1, characterized in that, The main valve (13) includes a first main valve port (131), a second main valve port (132), a third main valve port (133), and a fourth main valve port (134). The first main valve port (131) is connected to the main pump (11), the second main valve port (132) is connected to the oil tank (17), the third main valve port (133) is connected to the first end of the hoisting motor (15) through the first main oil passage (19), and the fourth main valve port (134) is connected to the second end of the hoisting motor (15) through the second main oil passage (21). The main valve (13) also includes a first position, a second position, and a third position. In the first position, the first main valve... The oil port (131), the second main valve oil port (132), the third main valve oil port (133), and the fourth main valve oil port (134) are disconnected from each other; in the second position, the first main valve oil port (131) and the fourth main valve oil port (134) are connected, and the second main valve oil port (132) and the third main valve oil port (133) are connected; in the third position, the first main valve oil port (131) and the third main valve oil port (133) are connected, and the second main valve oil port (132) and the fourth main valve oil port (134) are connected. The pilot valve group (29) is used to control the main valve (13) to switch between the first position, the second position, and the third position.

3. The rotary drilling rig winch hydraulic system as described in claim 1, characterized in that, Both the first reversing valve (31) and the second reversing valve (33) are solenoid valves; both the first reversing valve (31) and the second reversing valve (33) include a first reversing port (311) and a second reversing port (312), and both the first reversing valve (31) and the second reversing valve (33) include a fourth position and a fifth position. In the fourth position, the first reversing port (311) and the second reversing port (312) are directly connected. In the fifth position, the first reversing port (311) and the second reversing port (312) are connected through a throttle port. The valve switches between the fourth position and the fifth position by energizing or de-energizing the first reversing valve (31) or the second reversing valve (33).

4. The rotary drilling rig winch hydraulic system as described in claim 1, characterized in that, The pilot oil circuit also includes an overflow valve (37), one end of which is connected to the pilot oil supply circuit (25), and the other end is connected to the oil tank (17).

5. A method for controlling the winch of a rotary drilling rig, used to control a rotary drilling rig having a winch hydraulic system as described in any one of claims 1-4, characterized in that, The rotary drilling rig winch control method includes: The control handle begins to operate; Determine whether the valve core of the pilot valve group (29) has a displacement change. If so, determine whether the time between two adjacent displacement reversals of the valve core of the pilot valve group (29) is less than or equal to a preset time threshold (△T). If not, control the first reversing valve (31) and the second reversing valve (33) to switch to a state with a smaller flow rate. When the valve core of the pilot valve group (29) has two adjacent displacement switching times less than or equal to a preset time threshold (△T), the first switching valve (31) and the second switching valve (33) are controlled to switch to a state with a larger flow rate. When the valve core of the pilot valve group (29) has two adjacent displacement switching times greater than the preset time threshold (△T), it is determined whether the valve core of the pilot valve group (29) moves to the initial position. When the valve core of the pilot valve assembly (29) moves to the initial position, the first directional valve (31) and the second directional valve (33) are controlled to switch to a state with a smaller flow rate. When the valve core of the pilot valve assembly (29) does not move to the initial position, the first directional valve (31) is controlled to switch to a state with a smaller flow rate, and the second directional valve (33) is controlled to switch to a state with a larger flow rate.

6. The rotary drilling rig winch control method as described in claim 5, characterized in that, When the valve core of the pilot valve assembly (29) does not move to the initial position, the second directional valve (33) is controlled to switch to the state with a larger flow rate and a preset time (T) is recorded, and then the second directional valve (33) is controlled to switch to the state with a smaller flow rate.

7. A computer-readable storage medium, characterized in that, A computer program is stored on the computer-readable storage medium, which, when executed by a processor, implements the steps of the method as described in claim 5 or 6.

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