A polar drilling rig hydraulic system and control method thereof

Abstract

The present invention relates to a polar drilling rig hydraulic system and a control method thereof, wherein the hydraulic system comprises a hydraulic pump station, a load-sensitive multi-way valve, a two-position two-way reversing valve, a low-pressure relief valve, and a power head motor; the hydraulic pump station comprises a load-sensitive pump and an oil tank, the oil outlet of the load-sensitive pump is connected to the oil inlet of the load-sensitive multi-way valve, the load-sensitive multi-way valve comprises a first working joint, and the first working joint is connected to the power head motor; the LS port of the load-sensitive multi-way valve is divided into two branches, one branch is connected to the control oil port of the load-sensitive pump, and the other branch is connected to the first working oil port of the two-position two-way reversing valve, the second working oil port of the two-position two-way reversing valve is connected to the oil inlet of the low-pressure relief valve, and the return oil port of the low-pressure relief valve is connected to the oil tank. The beneficial effect is that the polar drilling rig hydraulic system adopts a load-sensitive pump and a load-sensitive multi-way valve to form a load-sensitive system, which can respond to load changes in real time, reduce system energy consumption, and improve system stability.

Description

Technical Field

[0001] The present invention relates to the technical field of polar drilling rigs, and in particular to a polar drilling rig hydraulic system and a control method thereof. Background Art

[0002] Polar drill rigs are specialized drilling equipment designed specifically for extremely cold environments. They must operate under extreme conditions, including temperatures ranging from -50°C to -60°C, strong winds, and ice and snow cover. They primarily serve the fields of resource exploration and scientific exploration. Their core functions include ice penetration, bedrock sampling, and oil and gas development, making them key tools for polar resource development and Earth science research. Due to the extreme cold in polar regions, the labor intensity is extremely high, so the drilling process is designed to be automated, lightweight, and efficient. For example, the drill pipe can be constructed with an aluminum alloy body and steel joints, reducing weight while ensuring strength. Furthermore, to accommodate wireline coring techniques, wireline coring drill pipe is also included.

[0003] Chinese patent document CN105350907A discloses a hydraulic multifunctional drilling rig, comprising a fuselage platform, a mast arranged on the surface of the fuselage platform, a mast bracket for supporting one end of the mast, and a mast support rod for driving the other end of the mast to rotate. A power head for driving the movement of the drilling tool is slidably arranged on the mast, and a clamp for circumferentially fixing the drilling tool is arranged at one end of the mast. A power head bracket for supporting itself is arranged at the bottom of the power head, and a slide rail is arranged on the surface of the mast along its own length, and the power head bracket is slidably arranged on the slide rail. A chuck for clamping the drilling tool is provided at the outlet of the power head, and the chuck is coaxial with the clamp.

[0004] Chinese patent document CN118997661A discloses an integrated above-ground and underground kilometer-long directional drilling rig, comprising: a mast for supporting the drill rod and drill bit of the drilling rig; a power head assembly mounted on the mast for driving the drill rod and drill bit for drilling operations; a chassis assembly mounted below the mast; a clamp mounting base mounted on the mast for mounting an above-ground angle adjustment cylinder or an underground angle adjustment cylinder; the clamp mounting base comprising a clamp mounting plate for mounting a drill rod clamping structure and a connecting plate fixedly connected to the clamp mounting plate; a feed cylinder mounting base for mounting the power head assembly disposed below the connecting plate; and a connecting plate for underground drilling disposed on the side of the feed cylinder away from the connecting plate. The power head assembly comprises: a feed mechanism mounted inside the mast; a power head support base mounted on the barrel of the feed cylinder of the feed mechanism; and a power head mounted on the power head support base. The feed mechanism consists of a feed cylinder and a feed mechanism connection seat mounted on the chassis assembly. When the feed mechanism is operating, the feed cylinder's barrel expands and contracts, driving the power head support seat and the power head on it to move synchronously. The drilling rig also includes a wire rope mounted on the mast; a traveling block connected to one end of the wire rope and the upper end of the drill pipe, respectively, for raising and lowering the drill pipe during drilling; and a winch connected to the other end of the wire rope to control the raising and lowering of the traveling block.

[0005] Chinese patent document CN118148524A discloses a drill rod grabbing manipulator for a drilling rig, comprising a mounting frame, a horizontal moving device, a flipping device and a manipulator; the horizontal moving device is arranged on the mounting frame, the fixed end of the flipping device is arranged on the horizontal moving device, the movable end of the flipping device is hinged to the first connection point of the manipulator, the second connection point of the manipulator is hinged to one side of the horizontal moving device, the flipping device pushes the first connection point of the manipulator to rotate around the second connection point so that the clamping axis of the manipulator is parallel to the axis of the drill rod; the manipulator clamps and drives the drill rod to move along its axial direction so that the drill rod moves away from or close to the ground, and the horizontal moving device drives the drill rod to the placement area of ​​the drill rod placement rack through the manipulator.

[0006] The defects and shortcomings of traditional hydraulic multifunctional drilling rigs are as follows: (1) A high-pressure relief valve is set for the rotation of the power head of the traditional drilling rig, but the polar drilling process is complicated. When coring with a rope, a rope coring drill rod is required. However, the rope coring drill rod is a small-diameter, thin-walled drill rod with low joint strength. If the rope coring drill rod is unhooked according to the set maximum pressure, the thread of the rope coring drill rod will be damaged; (2) The tool winch of the traditional drilling rig will not move with the power head, so when adding or removing the drill rod, the faucet and the active drill rod need to be manually removed and hung on the side of the mast, and then connected to the drill rod during drilling, which increases the labor intensity of the personnel. Summary of the Invention

[0007] (1) Technical issues to be resolved

[0008] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a polar drilling rig hydraulic system and a control method thereof, which solves the technical problem that when using a small-diameter, thin-walled drill rod for drilling during the rope coring process, the maximum rotation pressure of the existing drilling rig power head cannot be limited by secondary pressure, resulting in damage to the thread during the make-up and break-out.

[0009] (2) Technical solution

[0010] In order to achieve the above objectives, the main technical solutions adopted by the present invention include:

[0011] In a first aspect, an embodiment of the present invention provides a polar drilling rig hydraulic system, comprising a hydraulic pump station, a load-sensing multi-way valve, a two-position two-way reversing valve, a low-pressure relief valve, and an actuator, wherein the actuator comprises a power head motor;

[0012] The hydraulic pump station includes a load-sensing pump, a constant pressure pump, and an oil tank. The oil outlet of the oil tank is connected to the oil inlet of the load-sensing pump, the oil outlet of the load-sensing pump is connected to the oil inlet of the load-sensing multi-way valve, and the oil return port of the load-sensing multi-way valve is connected to the oil tank. The load-sensing multi-way valve includes a first working joint, which is connected to the power head motor to control the rotation direction and rotation speed of the power head motor.

[0013] The LS port of the load-sensing multi-way valve is divided into two branches. One branch is connected to the control oil port of the load-sensing pump, and the other branch is connected to the first working oil port of the two-position two-way reversing valve. The second working oil port of the two-position two-way reversing valve is connected to the oil inlet of the low-pressure relief valve, and the oil return port of the low-pressure relief valve is connected to the oil tank.

[0014] The actuator also includes a tool winch and a first shuttle valve;

[0015] The load-sensing multi-way valve further includes a third working link, which is connected to the tool winch and is used to control the rotation direction and rotation speed of the tool winch. The tool winch is provided with a brake, and a first shuttle valve is provided in the control circuit of the tool winch. The oil outlet of the first shuttle valve is connected to the brake. The first shuttle valve can output high-pressure oil in the working circuit of the tool winch to open the brake and release the brake on the tool winch.

[0016] The polar drilling rig hydraulic system also includes a second pressure reducing valve, a two-position four-way reversing valve and a second shuttle valve;

[0017] The oil outlet of the oil tank is connected to the oil inlet of the constant pressure pump, the oil outlet of the constant pressure pump is connected to the oil inlet of the second pressure reducing valve, the oil outlet of the second pressure reducing valve is connected to the first working oil port of the two-position four-way reversing valve, the oil drain port of the second pressure reducing valve and the second working oil port of the two-position four-way reversing valve are both connected to the oil tank; the third working oil port of the two-position four-way reversing valve is closed, the fourth working oil port of the two-position four-way reversing valve is connected to the first oil inlet of the second shuttle valve, the second oil inlet of the second shuttle valve is connected to the oil outlet of the first shuttle valve, and the oil outlet of the second shuttle valve is connected to the brake;

[0018] When the valve core of the two-position four-way reversing valve is in the first position, the first working oil port of the two-position four-way reversing valve is connected with the closed third working oil port, and the second working oil port of the two-position four-way reversing valve is connected with the fourth working oil port; when the valve core of the two-position four-way reversing valve is in the second position, the first working oil port of the two-position four-way reversing valve is connected with the fourth working oil port, and the second working oil port of the two-position four-way reversing valve is connected with the closed third working oil port.

[0019] Optionally, it further comprises a first pressure reducing valve, and the power head motor is a variable displacement hydraulic motor;

[0020] The oil outlet of the constant pressure pump is connected to the oil inlet of the first pressure reducing valve, the oil drain port of the first pressure reducing valve is connected to the oil tank, and the oil outlet of the first pressure reducing valve is connected to the control oil port of the power head motor;

[0021] The constant pressure pump can pump high-pressure oil to the first pressure reducing valve, and the oil outlet of the first pressure reducing valve can output the reduced-pressure low-pressure oil to the control oil port of the power head motor, thereby controlling the displacement of the power head motor.

[0022] Optionally, the actuator further comprises a salvage winch;

[0023] The load-sensing multi-way valve further includes a second working link, which is connected to the salvage winch and is used to control the rotation direction and rotation speed of the salvage winch;

[0024] A first two-way balancing valve is provided on the pipeline between the second working joint and the salvage winch. The first two-way balancing valve is used to control the salvage winch to be lowered smoothly and maintained at a set position.

[0025] Optionally, the actuator further includes a feed cylinder;

[0026] The load-sensing multi-way valve further includes a fourth working link, which is communicated with the feed oil cylinder and is used to control the movement direction and movement speed of the feed oil cylinder.

[0027] Optionally, an electric proportional multi-way valve is also included, and the actuator further includes: a left and right translation cylinder, a front and back translation cylinder, a gripper clamping cylinder, a rod feeding motor and a gripper tilting cylinder;

[0028] The oil outlet and return oil port of the hydraulic pump station are respectively connected to the corresponding oil ports of the electric proportional multi-way valve. The electric proportional multi-way valve includes the fifth working joint, the sixth working joint, the seventh working joint, the eighth working joint and the ninth working joint. The fifth working joint is connected to the left and right translation cylinders, the sixth working joint is connected to the front and rear translation cylinders, the seventh working joint is connected to the clamping cylinder of the clamp, the eighth working joint is connected to the feed rod motor, and the ninth working joint is connected to the clamp tilt cylinder.

[0029] Optionally, a hydraulic lock is provided on the pipeline between the seventh working link and the clamping cylinder, a second two-way balancing valve is provided on the pipeline between the eighth working link and the rod feeding motor, and a third two-way balancing valve is provided on the pipeline between the ninth working link and the clamping tilting cylinder.

[0030] In a second aspect, an embodiment of the present invention provides a control method for the above-mentioned polar drilling rig hydraulic system, comprising the following steps:

[0031] When the polar drilling rig is drilling drill rods other than rope coring drill rods, the two-position two-way reversing valve cuts off the pipeline between the LS port of the load-sensing multi-way valve and the low-pressure relief valve. The load-sensing pump pumps the hydraulic oil from the oil tank to the load-sensing multi-way valve. The hydraulic oil flowing out of the LS port of the load-sensing multi-way valve completely flows to the control oil port of the load-sensing pump. The pump outlet pressure of the load-sensing pump is adjusted according to the following formula:

[0032] ;

[0033] Among them, P 泵出口 is the pump outlet pressure of the load sensing pump;

[0034] P LS1 LS port pressure of the load sensing multi-way valve;

[0035] ΔP is a fixed pressure difference, ranging from 1.4 to 2.2 MPa;

[0036] When the polar drilling rig is drilling a rope coring drill pipe, the two-position two-way reversing valve connects the pipeline between the LS port of the load-sensing multi-way valve and the low-pressure relief valve. The load-sensing pump pumps the hydraulic oil from the oil tank to the load-sensing multi-way valve. Part of the hydraulic oil flowing out of the LS port of the load-sensing multi-way valve flows to the control oil port of the load-sensing pump, and the other part flows to the low-pressure relief valve. At this time, the pump outlet pressure of the load-sensing pump is adjusted according to the following formula:

[0037] ;

[0038] Among them, P 泵出口 is the pump outlet pressure of the load sensing pump;

[0039] P LS2is the LS port pressure of the load sensing multi-way valve, and P LS2 Less than or equal to the set pressure P of the low-pressure relief valve 设定 ;

[0040] ΔP is a fixed pressure difference, which is 1.4-2.2MPa.

[0041] Optionally, the method further includes the following steps:

[0042] When the tool winch needs to follow the power head motor, the valve core of the two-position four-way reversing valve is switched to the second position, so that the first working oil port of the two-position four-way reversing valve is connected to the fourth working oil port, and the constant pressure pump supplies high-pressure oil to the second pressure reducing valve. The oil drain port of the second pressure reducing valve returns the excess oil to the oil tank, and the oil outlet of the second pressure reducing valve outputs the reduced-pressure low-pressure oil, which enters the brake after passing through the two-position four-way reversing valve and the second shuttle valve in sequence, driving the brake to release the brake on the tool winch.

[0043] (3) Beneficial effects

[0044] The beneficial effects of the present invention are as follows: the polar drilling rig hydraulic system of the present invention includes a hydraulic pump station, a load-sensitive multi-way valve, a two-position two-way reversing valve, a low-pressure relief valve and an actuator, the actuator includes a power head motor; the hydraulic pump station includes a load-sensitive pump and an oil tank, the oil outlet of the oil tank is connected to the oil inlet of the load-sensitive pump, the oil outlet of the load-sensitive pump is connected to the oil inlet of the load-sensitive multi-way valve, the oil return port of the load-sensitive multi-way valve is connected to the oil tank, the load-sensitive multi-way valve includes a first working joint, the first working joint is connected to the power head motor, and is used to control the rotation direction and rotation speed of the power head motor; the LS port of the load-sensitive multi-way valve is divided into two branches, one branch is connected to the control oil port of the load-sensitive pump, and the other branch is connected to the first working oil port of the two-position two-way reversing valve, the second working oil port of the two-position two-way reversing valve is connected to the oil inlet of the low-pressure relief valve, and the oil return port of the low-pressure relief valve is connected to the oil tank. Compared to existing polar drilling rig hydraulic systems, the polar drilling rig hydraulic system of the present invention utilizes a load-sensing pump and load-sensing valve to form a load-sensing system, enabling precise matching of pressure and flow with load requirements, ensuring system efficiency and energy conservation. Furthermore, the polar drilling rig hydraulic system of the present invention utilizes a two-position, two-way reversing valve and a low-pressure relief valve in parallel at the LS port of the load-sensing valve. Consequently, when driving the power head to make or break out the rope coring drill pipe, the two-position, two-way reversing valve opens, connecting the pipeline between the LS port of the load-sensing multi-way valve and the low-pressure relief valve. This reduces the maximum swing pressure of the power head to the set value of the low-pressure relief valve, preventing thread damage.

[0045] The polar drilling rig hydraulic system of the present invention delivers pilot control oil to the power head motor through a constant pressure pump and a first pressure reducing valve. The pilot control oil pushes the servo valve core of the power head motor to move to control the displacement of the power head motor, thereby dynamically adjusting the output torque and speed of the power head motor to optimize system efficiency and adapt to complex working conditions.

[0046] The polar drilling rig hydraulic system of the present invention also includes a tool winch, a first shuttle valve, a second pressure reducing valve, a two-position four-way reversing valve and a second shuttle valve. The oil outlet of the constant pressure pump is connected to the oil inlet of the second pressure reducing valve, the oil outlet of the second pressure reducing valve is connected to the first working oil port of the two-position four-way reversing valve, the oil drain port of the second pressure reducing valve and the second working oil port of the two-position four-way reversing valve are both connected to the oil tank; the third working oil port of the two-position four-way reversing valve is closed, the fourth working oil port of the two-position four-way reversing valve is connected to the first oil inlet of the second shuttle valve, the second oil inlet of the second shuttle valve is connected to the oil outlet of the first shuttle valve, and the oil outlet of the second shuttle valve is connected to the brake. Compared with the existing polar drilling rig hydraulic system, the polar drilling rig hydraulic system of the present invention can switch the valve core of the two-position four-way reversing valve to the second position, so that the first working oil port of the two-position four-way reversing valve is connected to the fourth working oil port, and the constant pressure pump supplies high-pressure oil to the second pressure reducing valve, and the oil drain port of the second pressure reducing valve returns the excess oil to the oil tank. The oil outlet of the second pressure reducing valve outputs the reduced-pressure oil, which enters the brake after passing through the two-position four-way reversing valve and the second shuttle valve in turn, driving the brake to release the brake on the tool winch, thereby enabling the tool winch to move with the power head motor, that is, the tool winch can follow the power head and descend synchronously during drilling. Therefore, the tool winch of the present invention can always hang the faucet and the active drill rod regardless of drilling or adding or subtracting drill rods, which avoids frequent disassembly and assembly of the tool winch, the faucet and the active drill rod, thereby significantly reducing manual labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a schematic structural diagram of Example 1 of the polar drilling rig hydraulic system of the present invention;

[0048] Figure 2 This is a structural diagram of Example 3 of the polar drilling rig hydraulic system of the present invention.

[0049] [Description of Reference Numerals]

[0050] 1: Hydraulic pump station; 101: Load sensing pump; 102: Oil tank; 103: Constant pressure pump;

[0051] 2: Load-sensing multi-way valve; 3: Power head motor; 4: Salvage winch; 5: Tool winch; 6: Feed cylinder; 7: Two-position two-way reversing valve; 8: Low-pressure relief valve; 9: First pressure-reducing valve; 10: Second pressure-reducing valve; 11: Two-position four-way reversing valve; 12: Brake; 13: First shuttle valve; 14: Second shuttle valve; 15: First two-way balancing valve;

[0052] 16: Electric proportional multi-way valve; 17: Left and right translation cylinder; 18: Forward and backward translation cylinder; 19: Gripper clamping cylinder; 20: Gripper tilting cylinder; 21: Rod feeding motor; 22: Hydraulic lock; 23: Second two-way balancing valve; 24: Third two-way balancing valve. DETAILED DESCRIPTION

[0053] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0054] Example 1:

[0055] Reference Figure 1 This embodiment provides a hydraulic system for an arctic drilling rig, comprising a hydraulic pump station 1, a load-sensing multi-way valve 2, a two-position, two-way reversing valve 7, a low-pressure relief valve 8, and an actuator. The actuator comprises a power head motor 3, a salvage winch 4, a tool winch 5, and a feed cylinder 6. It should be noted that the power head motor 3 transmits power to the drill pipe and drill bit, driving the drill bit to break rock or formations; the salvage winch 4 is used to drive the salvage tool up and down to capture downhole objects or core barrels; the tool winch 5 is connected to the drill tool via a wire rope and is used to raise and lower the drill tool, casing, downhole tools, and assist in tasks such as making and breaking out and hoisting equipment; and the feed cylinder 6 is used to control the axial feed motion of the drill tool (drill pipe, drill bit) to achieve precise adjustment of the bit pressure, raise and lower the drill tool, and meet the drilling requirements of complex formations.

[0056] The hydraulic pump station 1 includes a load-sensing pump 101 and an oil tank 102. The oil outlet of the oil tank 102 is connected to the oil inlet of the load-sensing pump 101. The oil outlet of the load-sensing pump 101 is connected to the oil inlet of the load-sensing multi-way valve 2. The oil return port of the load-sensing multi-way valve 2 is connected to the oil tank 102. The load-sensing multi-way valve 2 includes a first working joint, which is connected to the power head motor 3 to control the rotation direction and rotation speed of the power head motor 3.

[0057] The LS port of the load-sensing multi-way valve 2 is divided into two branches, one branch is connected to the control oil port of the load-sensing pump 101, and the other branch is connected to the first working oil port of the two-position two-way reversing valve 7. The second working oil port of the two-position two-way reversing valve 7 is connected to the oil inlet of the low-pressure relief valve 8, and the return oil port of the low-pressure relief valve 8 is connected to the oil tank 102.

[0058] It should be noted that the LS port of the load-sensing multi-way valve 2 is a load-sensing port. The load-sensing multi-way valve 2 can monitor the load pressure of each actuator in the hydraulic system in real time and feed back the highest load pressure to the load-sensing pump 101 to form a closed-loop control. The load-sensing pump 101 can adjust the pump displacement (such as the swash plate angle or plunger stroke) according to the feedback signal of the load-sensing multi-way valve 2 to match the required flow rate of the system in real time and avoid the generation of excess flow. The pump outlet pressure P of the load-sensing pump 101 is 泵出口 The pressure is always a fixed differential pressure ΔP higher than the system's maximum load pressure. The two-position, two-way directional valve 7 is a basic hydraulic control component with two operating positions and two pathways. It is primarily used to control the flow of hydraulic oil, connecting or disconnecting the pipeline. The low-pressure relief valve 8 is a pressure control valve primarily used to control oil pressure in hydraulic systems to prevent the system pressure from exceeding the set value.

[0059] The operating process of the polar drilling rig hydraulic system of this embodiment is as follows: When the power head motor 3 rotates normally to drive drill rods other than the rope coring drill rod for drilling operations, the two-position two-way reversing valve 7 cuts off the pipeline between the LS port of the load-sensing multi-way valve 2 and the low-pressure relief valve 8, allowing the hydraulic oil flowing out of the LS port of the load-sensing multi-way valve 2 to flow entirely to the control oil port of the load-sensing pump 101. The pump outlet pressure of the load-sensing pump 101 is adjusted according to the following formula:

[0060] ;

[0061] Among them, P 泵出口 is the pump outlet pressure of the load sensing pump 101;

[0062] P LS1 The LS port pressure of load sensing multi-way valve 2;

[0063] ΔP is a fixed pressure difference, which is 1.4-2.2MPa.

[0064] It should be noted that drill pipe other than wireline coring drill pipe can be made of an aluminum alloy body with steel joints. Due to the high strength of the steel joints, they can withstand the maximum pressure of the hydraulic system. At this point, the oil line between the low-pressure relief valve 8 and the LS port of the load-sensing multi-way valve 2 is cut off by the two-position, two-way reversing valve 7. The pump outlet pressure of the load-sensing pump 101 is output according to the maximum load pressure of the actuator.

[0065] When the power head motor 3 of this embodiment is drilling the rope coring drill pipe, due to the low strength of the joint of the rope coring drill pipe, the rotary pressure during the make-up and break-out will reach the maximum pressure of the system, thereby damaging the thread of the rope coring drill pipe. In order to solve the above problem, the load sensing pump 101 needs to reduce the pump outlet pressure P 泵出口At this time, the two-position two-way reversing valve 7 connects the pipeline between the LS port of the load-sensing multi-way valve 2 and the low-pressure relief valve 8. At this time, part of the hydraulic oil flowing out of the LS port of the load-sensing multi-way valve 2 flows to the control oil port of the load-sensing pump 101, and the other part flows to the low-pressure relief valve 8. The set pressure of the low-pressure relief valve 8 is P 设定 , when the oil inlet pressure of the low pressure relief valve 8 is greater than P 设定 When , the valve core opens, and the excess oil flows back to the oil tank 102 to maintain the system pressure constant. At this time, the pump outlet pressure of the load sensing pump 101 is adjusted according to the following formula:

[0066] ;

[0067] Among them, P 泵出口 is the pump outlet pressure of the load sensing pump 101;

[0068] P LS2 is the LS port pressure of load sensing multi-way valve 2, and P LS2 Less than or equal to the set pressure P of the low-pressure relief valve 8 设定 ;

[0069] ΔP is a fixed pressure difference, which is 1.4-2.2MPa.

[0070] The polar drilling rig hydraulic system of this embodiment connects the low-pressure relief valve 8 to the LS oil circuit of the load-sensing multi-way valve 2 via a two-position, two-way reversing valve. This reduces the maximum pump outlet pressure of the load-sensing pump 101 to the set value of the low-pressure relief valve 8, thereby reducing the rotary torque and protecting the threads of the rope coring drill pipe.

[0071] Furthermore, the polar drilling rig hydraulic system of this embodiment also includes a first pressure reducing valve 9, the hydraulic pump station 1 also includes a constant pressure pump 103, and the power head motor 3 is a variable displacement hydraulic motor. The oil outlet of the oil tank 102 is connected to the oil inlet of the constant pressure pump 103, the oil outlet of the constant pressure pump 103 is connected to the oil inlet of the first pressure reducing valve 9, the oil drain port of the first pressure reducing valve 9 is connected to the oil tank 102, and the oil outlet of the first pressure reducing valve 9 is connected to the control oil port of the power head motor 3. The constant pressure pump 103 can pump high-pressure oil to the first pressure reducing valve 9, and the oil outlet of the first pressure reducing valve 9 can output the reduced-pressure low-pressure oil to the control oil port of the power head motor 3, thereby controlling the displacement of the power head motor 3. The oil drain port of the first pressure reducing valve 9 returns excess oil to the oil tank 102 to ensure pressure stability.

[0072] The polar drilling rig hydraulic system of this embodiment delivers pilot control oil to the power head motor 3 through the constant pressure pump 103 and the first pressure reducing valve 9. The pilot control oil drives the servo valve core of the power head motor 3 to move to control the displacement of the power head motor 3, thereby dynamically adjusting the output torque and speed of the power head motor 3 to optimize system efficiency and adapt to complex working conditions.

[0073] In this embodiment, the load-sensing multi-way valve 2 also includes a second working connection, which is connected to the salvage winch 4 and is used to control the rotation direction and speed of the salvage winch 4. A first two-way balancing valve 15 is installed in the pipeline between the second working connection and the salvage winch 4. The first two-way balancing valve 15 is used to control the smooth lowering of the salvage winch 4 and maintain it in the set position.

[0074] It should be noted that the first two-way balancing valve 15 is provided in the control circuit of the salvage winch 4 to balance the pressure and control the flow of the fluid circuit so that the salvage winch 4 can be lowered smoothly and maintained at the set position, thereby ensuring the stability of the salvage winch 4 in the standby state.

[0075] In this embodiment, the polar drilling rig hydraulic system also includes a first shuttle valve 13. The load-sensing multi-way valve 2 also includes a third working connection, which is connected to the tool winch 5 to control the rotation direction and speed of the tool winch 5. The tool winch 5 is equipped with a brake 12. The first shuttle valve 13 is installed in the control circuit of the tool winch 5. The oil outlet of the first shuttle valve 13 is connected to the brake 12. The first shuttle valve 13 can discharge the high-pressure oil in the working circuit of the tool winch 5, which is used to open the brake 12 and release the brake on the tool winch 5.

[0076] It should be noted that when the third working link is operating to supply oil to the tool winch 5, the two oil inlets of the first shuttle valve 13 receive input pressure from two different oil circuits. The oil outlet of the first shuttle valve 13 outputs the higher pressure of the two oil inlets while simultaneously closing the other oil inlet. This activates the brake 12 to release the brake on the tool winch 5, allowing the tool winch 5 to operate normally. When the third working link is not operating, the pressure in the control circuit of the tool winch 5 is balanced, and the first shuttle valve 13 cannot supply high-pressure oil. At this time, the brake 12 brakes the tool winch 5.

[0077] Furthermore, the polar drilling rig hydraulic system of this embodiment also includes a second pressure-reducing valve 10, a two-position, four-way reversing valve 11, and a second shuttle valve 14. The oil outlet of the constant pressure pump 103 is connected to the oil inlet of the second pressure-reducing valve 10, which is in turn connected to the first operating oil port of the two-position, four-way reversing valve 11. The oil drain port of the second pressure-reducing valve 10 and the second operating oil port of the two-position, four-way reversing valve 11 are both connected to the oil tank 102. The third operating oil port of the two-position, four-way reversing valve 11 is sealed, while the fourth operating oil port of the two-position, four-way reversing valve 11 is connected to the first oil inlet of the second shuttle valve 14. The second oil inlet of the second shuttle valve 14 is connected to the oil outlet of the first shuttle valve 13, and the oil outlet of the second shuttle valve 14 is connected to the brake 12.

[0078] When the valve core of the two-position four-way reversing valve 11 is in the first position, the first working oil port of the two-position four-way reversing valve 11 is connected with the closed third working oil port, and the second working oil port of the two-position four-way reversing valve 11 is connected with the fourth working oil port; when the valve core of the two-position four-way reversing valve 11 is in the second position, the first working oil port of the two-position four-way reversing valve 11 is connected with the fourth working oil port, and the second working oil port of the two-position four-way reversing valve 11 is connected with the closed third working oil port.

[0079] It should be noted that when the valve core of the two-position four-way reversing valve 11 is in the first position, the second working oil port of the two-position four-way reversing valve 11 is connected to the fourth working oil port, causing the first oil inlet of the second shuttle valve 14 to be connected to the oil tank 102. That is, the pressure at the first oil inlet of the second shuttle valve 14 is zero. In this case, if the third working link is operating and supplying oil to the tool winch 5, the first shuttle valve 13 draws high-pressure oil from the control circuit of the tool winch 5 and enters the brake 12 through the second shuttle valve 14, driving the brake 12 to release the brake on the tool winch 5. If the third working link is not operating, the pressure in the control circuit of the tool winch 5 is balanced, and the first shuttle valve 13 cannot draw high-pressure oil. That is, the pressure at the second oil inlet of the second shuttle valve 14 is zero. At this time, the second shuttle valve 14 is also unable to draw high-pressure oil, and the brake 12 brakes the tool winch 5.

[0080] When the valve core of the two-position four-way reversing valve 11 is in the second position and the constant pressure pump 103 supplies high-pressure oil to the second pressure reducing valve 10, the first working oil port of the two-position four-way reversing valve 11 is connected to the fourth working oil port, and the oil outlet of the second pressure reducing valve 10 outputs the reduced-pressure low-pressure oil, which enters the brake 12 after passing through the two-position four-way reversing valve 11 and the second shuttle valve 14 in sequence, driving the brake 12 to release the brake on the tool winch 5, and the oil drain port of the second pressure reducing valve 10 returns the excess oil to the oil tank 102 to ensure pressure stability. When the third working joint is not working, the constant pressure pump 103 can also drive the brake 12 on the tool winch 5, so that the brake 12 releases the brake on the tool winch 5, thereby allowing the tool winch 5 to follow together with the power head motor 3.

[0081] The advantage of the tool winch 5 being able to move with the power head motor 3 is that it eliminates the need for frequent handling of the faucet and active drill rod, significantly reducing labor intensity. Specifically, when adding or removing drill rods from the drilling rig, the central channel of the power head must be cleared. During this process, the tool winch must hold the faucet and active drill rod, and the operator then supports the faucet and active drill rod and swings them to the side of the mast to hook them. After adding or removing drill rods, the faucet and active drill rod must be connected to the power head for downward drilling. During this process, the tool winch of a conventional drilling rig does not hold the faucet and active drill rod. Each time a drill rod is added or removed, the operator must constantly move and hang them between the central channel of the power head and the side of the mast, which is labor-intensive. In contrast, the tool winch 5 of this embodiment can move downward synchronously with the power head during drilling. Therefore, the tool winch 5 of this embodiment can always hold the faucet and active drill rod, regardless of drilling or adding or removing drill rods. This avoids the need for frequent handling of the faucet and active drill rod, significantly reducing labor intensity.

[0082] In this embodiment, the load-sensing multi-way valve 2 further includes a fourth working link, which is connected to the feed cylinder 6 and is used to control the movement direction and movement speed of the feed cylinder 6 .

[0083] Furthermore, a first pressure gauge is provided on the pipeline between the fourth working joint and the rod chamber of the feed cylinder 6, and a second pressure gauge is provided on the pipeline between the fourth working joint and the rodless chamber of the feed cylinder 6. It should be noted that the first and second pressure gauges are low-temperature resistant pressure gauges.

[0084] The polar drilling rig of this embodiment can be equipped with a 3-meter drill rod to reduce the frequency of make-up and break-out and improve drilling efficiency.

[0085] Furthermore, electric heating devices can be installed on the pipes between the various components of the polar drilling rig hydraulic system. This electric heating device can dissipate a certain amount of heat, replenishing the loss of the heated pipes through direct or indirect heat exchange, thereby achieving normal operating requirements of heating, heat preservation or anti-freezing.

[0086] Example 2:

[0087] This embodiment provides a control method for the polar drilling rig hydraulic system described in Example 1, comprising the following steps:

[0088] When the polar drilling rig is drilling drill rods other than the rope coring drill rod, the two-position two-way reversing valve 7 cuts off the pipeline between the LS port of the load-sensing multi-way valve 2 and the low-pressure relief valve 8. The load-sensing pump 101 pumps the hydraulic oil from the oil tank 102 to the load-sensing multi-way valve 2. The hydraulic oil flowing out of the LS port of the load-sensing multi-way valve 2 completely flows to the control oil port of the load-sensing pump 101. The pump outlet pressure of the load-sensing pump 101 is adjusted according to the following formula:

[0089] ;

[0090] Among them, P 泵出口 is the pump outlet pressure of the load sensing pump 101;

[0091] P LS1 The LS port pressure of load sensing multi-way valve 2;

[0092] ΔP is a fixed pressure difference, ranging from 1.4 to 2.2 MPa;

[0093] When the polar drilling rig is drilling a rope coring drill pipe, the two-position two-way reversing valve 7 connects the pipeline between the LS port of the load-sensing multi-way valve 2 and the low-pressure relief valve 8. The load-sensing pump 101 pumps the hydraulic oil from the oil tank 102 to the load-sensing multi-way valve 2. Part of the hydraulic oil flowing out of the LS port of the load-sensing multi-way valve 2 flows to the control oil port of the load-sensing pump 101, and the other part flows to the low-pressure relief valve 8. At this time, the pump outlet pressure of the load-sensing pump 101 is adjusted according to the following formula:

[0094] ;

[0095] Among them, P 泵出口 is the pump outlet pressure of the load sensing pump 101;

[0096] P LS2 is the LS port pressure of load sensing multi-way valve 2, and P LS2 Less than or equal to the set pressure P of the low-pressure relief valve 8 设定 ;

[0097] ΔP is a fixed pressure difference, which is 1.4-2.2MPa.

[0098] The rest of the details that are the same as those in Example 1 will not be repeated here.

[0099] Example 3:

[0100] The polar drilling rig of this embodiment can be equipped with an automated drill pipe manipulator, which not only reduces the labor intensity of personnel during the drilling process, but also improves the operating efficiency.

[0101] See also Figure 2 This embodiment provides another polar drilling rig hydraulic system, further comprising an electric proportional multi-way valve 16. The actuators also include: a left-right translation cylinder 17, a fore-and-aft translation cylinder 18, a gripper holding cylinder 19, a rod feed motor 21, and a gripper tilting cylinder 20. It should be noted that the left-right translation cylinder 17, the fore-and-aft translation cylinder 18, the gripper holding cylinder 19, the rod feed motor 21, and the gripper tilting cylinder 20 serve as the actuators for the drill rod gripping manipulator used in the drilling rig. The gripper holding cylinder 19 is used to drive the manipulator's gripper to grip the drill rod; the left-right translation cylinder 17 is used to drive the manipulator to carry the drill rod for left-right translation; the fore-and-aft translation cylinder 18 is used to drive the manipulator to carry the drill rod for fore-and-aft translation; the gripper tilting cylinder 20 is used to drive the manipulator to tilt the drill rod to adjust its posture; and the rod feed motor 21 is used to drive the drill rod to move along its axis.

[0102] The oil outlet of the constant pressure pump 103 and the oil return port of the oil tank 102 are respectively connected to the corresponding oil ports of the electric proportional multi-way valve 16. The electric proportional multi-way valve 16 includes a fifth working joint, a sixth working joint, a seventh working joint, an eighth working joint and a ninth working joint. The fifth working joint is connected to the left and right translation cylinder 17, the sixth working joint is connected to the front and rear translation cylinder 18, the seventh working joint is connected to the clamping cylinder 19, the eighth working joint is connected to the feeding rod motor 21, and the ninth working joint is connected to the clamping cylinder 20.

[0103] Furthermore, a hydraulic lock 22 is installed on the pipeline between the seventh working link and the gripper clamping cylinder 19; a second two-way balancing valve 23 is installed on the pipeline between the eighth working link and the rod feed motor 21; and a third two-way balancing valve 24 is installed on the pipeline between the ninth working link and the gripper tilting cylinder 20. It should be noted that the hydraulic lock 22 can seal the cylinder oil, keeping the cylinder in a static state for a longer period of time. The hydraulic lock 22 ensures smooth operation of the actuator and locks it when it stops.

[0104] The rest of the details that are the same as those in Example 1 will not be repeated here.

[0105] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0106] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0107] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0108] In the description of this specification, the terms "one embodiment", "some embodiments", "embodiments", "examples", "specific examples" or "some examples" refer to the specific features, structures, materials or characteristics described in conjunction with the embodiment or example and included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples, unless they are mutually inconsistent.

[0109] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A polar drilling rig hydraulic system, characterized in that: It includes a hydraulic pump station (1), a load-sensing multi-way valve (2), a two-position two-way reversing valve (7), a low-pressure relief valve (8) and an actuator, wherein the actuator includes a power head motor (3); The hydraulic pump station (1) includes a load-sensitive pump (101), a constant pressure pump (103) and an oil tank (102); the oil outlet of the oil tank (102) is connected to the oil inlet of the load-sensitive pump (101); the oil outlet of the load-sensitive pump (101) is connected to the oil inlet of the load-sensitive multi-way valve (2); the oil return port of the load-sensitive multi-way valve (2) is connected to the oil tank (102); the load-sensitive multi-way valve (2) includes a first working joint, and the first working joint is connected to the power head motor (3) to control the rotation direction and rotation speed of the power head motor (3); The LS port of the load-sensing multi-way valve (2) is divided into two branches, one branch is connected to the control oil port of the load-sensing pump (101), and the other branch is connected to the first working oil port of the two-position two-way reversing valve (7). The second working oil port of the two-position two-way reversing valve (7) is connected to the oil inlet of the low-pressure relief valve (8), and the return oil port of the low-pressure relief valve (8) is connected to the oil tank (102). The actuator also includes a tool winch (5) and a first shuttle valve (13); The load-sensing multi-way valve (2) further includes a third working link, which is connected to the tool winch (5) and is used to control the rotation direction and rotation speed of the tool winch (5); a brake (12) is provided on the tool winch (5), and a first shuttle valve (13) is provided in the control circuit of the tool winch (5); the oil outlet of the first shuttle valve (13) is connected to the brake (12), and the first shuttle valve (13) can output high-pressure oil in the working circuit of the tool winch (5) to open the brake (12) and release the brake on the tool winch (5); The polar drilling rig hydraulic system further includes a second pressure reducing valve (10), a two-position four-way reversing valve (11) and a second shuttle valve (14); The oil outlet of the oil tank (102) is connected to the oil inlet of the constant pressure pump (103), the oil outlet of the constant pressure pump (103) is connected to the oil inlet of the second pressure reducing valve (10), the oil outlet of the second pressure reducing valve (10) is connected to the first working oil port of the two-position four-way reversing valve (11), the oil drain port of the second pressure reducing valve (10) and the second working oil port of the two-position four-way reversing valve (11) are both connected to the oil tank (102); the third working oil port of the two-position four-way reversing valve (11) is closed, the fourth working oil port of the two-position four-way reversing valve (11) is connected to the first oil inlet of the second shuttle valve (14), the second oil inlet of the second shuttle valve (14) is connected to the oil outlet of the first shuttle valve (13), and the oil outlet of the second shuttle valve (14) is connected to the brake (12); When the valve core of the two-position four-way reversing valve (11) is located in the first position, the first working oil port of the two-position four-way reversing valve (11) is communicated with the closed third working oil port, and the second working oil port of the two-position four-way reversing valve (11) is communicated with the fourth working oil port; when the valve core of the two-position four-way reversing valve (11) is located in the second position, the first working oil port of the two-position four-way reversing valve (11) is communicated with the fourth working oil port, and the second working oil port of the two-position four-way reversing valve (11) is communicated with the closed third working oil port.

2. The polar drilling rig hydraulic system according to claim 1, characterized in that: It also includes a first pressure reducing valve (9), and the power head motor (3) is a variable displacement hydraulic motor; The oil outlet of the constant pressure pump (103) is connected to the oil inlet of the first pressure reducing valve (9), the oil drain port of the first pressure reducing valve (9) is connected to the oil tank (102), and the oil outlet of the first pressure reducing valve (9) is connected to the control oil port of the power head motor (3); The constant pressure pump (103) can pump high-pressure oil to the first pressure reducing valve (9), and the oil outlet of the first pressure reducing valve (9) can output the reduced-pressure low-pressure oil to the control oil outlet of the power head motor (3), thereby controlling the displacement of the power head motor (3).

3. The polar drilling rig hydraulic system according to claim 1, characterized in that: The actuator also includes a salvage winch (4); The load-sensitive multi-way valve (2) further includes a second working link, which is connected to the salvage winch (4) and is used to control the rotation direction and rotation speed of the salvage winch (4); A first two-way balancing valve (15) is provided on the pipeline between the second working joint and the salvage winch (4). The first two-way balancing valve (15) is used to control the salvage winch (4) to be lowered smoothly and maintained at a set position.

4. The polar drilling rig hydraulic system according to claim 1, characterized in that: The actuator also includes a feed cylinder (6); The load-sensing multi-way valve (2) further comprises a fourth working link, which is connected to the feed oil cylinder (6) and is used to control the movement direction and movement speed of the feed oil cylinder (6).

5. The polar drilling rig hydraulic system according to claim 1, characterized in that: It also includes an electric proportional multi-way valve (16), and the actuator also includes: a left and right translation cylinder (17), a front and rear translation cylinder (18), a clamping claw holding cylinder (19), a rod feeding motor (21) and a clamping claw tilting cylinder (20); The oil outlet and return oil port of the hydraulic pump station (1) are respectively connected to the corresponding oil ports of the electric proportional multi-way valve (16) in a one-to-one correspondence. The electric proportional multi-way valve (16) includes a fifth working link, a sixth working link, a seventh working link, an eighth working link and a ninth working link. The fifth working link is connected to the left and right translation cylinder (17), the sixth working link is connected to the front and rear translation cylinder (18), the seventh working link is connected to the clamping cylinder (19), the eighth working link is connected to the rod feeding motor (21), and the ninth working link is connected to the clamping cylinder (20).

6. The polar drilling rig hydraulic system according to claim 5, characterized in that: A hydraulic lock (22) is provided on the pipeline between the seventh working link and the clamping oil cylinder (19), a second two-way balancing valve (23) is provided on the pipeline between the eighth working link and the rod feeding motor (21), and a third two-way balancing valve (24) is provided on the pipeline between the ninth working link and the clamping oil cylinder (20).

7. A method for controlling a hydraulic system of an arctic drilling rig according to any one of claims 1 to 6, characterized in that: The following steps are involved: When the polar drilling rig is drilling drill rods other than the rope coring drill rod, the two-position two-way reversing valve (7) cuts off the pipeline between the LS port of the load sensing multi-way valve (2) and the low-pressure relief valve (8), and the load sensing pump (101) pumps the hydraulic oil from the oil tank (102) to the load sensing multi-way valve (2). The hydraulic oil flowing out of the LS port of the load sensing multi-way valve (2) completely flows to the control oil port of the load sensing pump (101). The pump outlet pressure of the load sensing pump (101) is adjusted according to the following formula: ； Among them, P 泵出口 is the pump outlet pressure of the load sensing pump (101); P LS1 is the LS port pressure of the load sensing multi-way valve (2); ΔP is a fixed pressure difference, ranging from 1.4 to 2.2 MPa; When the polar drilling rig is drilling a rope coring drill pipe, the two-position two-way reversing valve (7) connects the pipeline between the LS port of the load-sensing multi-way valve (2) and the low-pressure relief valve (8). The load-sensing pump (101) pumps the hydraulic oil from the oil tank (102) to the load-sensing multi-way valve (2). Part of the hydraulic oil flowing out of the LS port of the load-sensing multi-way valve (2) flows to the control oil port of the load-sensing pump (101), and the other part flows to the low-pressure relief valve (8). At this time, the pump outlet pressure of the load-sensing pump (101) is adjusted according to the following formula: ； Among them, P 泵出口 is the pump outlet pressure of the load sensing pump (101); P LS2 is the LS port pressure of the load sensing multi-way valve (2), and P LS2 Less than or equal to the set pressure P of the low-pressure relief valve (8) 设定 ; ΔP is a fixed pressure difference, which is 1.4-2.2MPa.

8. The control method of the polar drilling rig hydraulic system according to claim 7, characterized in that: The following steps are also included: When the tool winch (5) needs to follow the power head motor (3), the valve core of the two-position four-way reversing valve (11) is switched to the second position, so that the first working oil port of the two-position four-way reversing valve (11) is connected to the fourth working oil port, and the constant pressure pump (103) supplies high-pressure oil to the second pressure reducing valve (10). The oil drain port of the second pressure reducing valve (10) returns the excess oil to the oil tank (102), and the oil outlet of the second pressure reducing valve (10) outputs the reduced-pressure low-pressure oil, which enters the brake (12) after passing through the two-position four-way reversing valve (11) and the second shuttle valve (14) in sequence, and drives the brake (12) to release the brake on the tool winch (5).

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