Hydraulic system of polar region drilling machine

Abstract

The utility model relates to a polar region drilling machine hydraulic system which comprises a hydraulic pump station, a multi-way reversing valve and an executing mechanism, and the executing mechanism comprises a tool winch, a first shuttle valve, a second shuttle valve and a tool winch follow-up valve. An oil outlet and an oil return port of the hydraulic pump station are communicated with corresponding oil ports of the multi-way reversing valve, the multi-way reversing valve comprises a first working unit, the first working unit is communicated with the tool winch, a brake is arranged on the tool winch, and a first shuttle valve is arranged in a control loop of the tool winch; an oil outlet of the hydraulic pump station is communicated with a first oil inlet of the second shuttle valve through the tool winch follow-up valve, an oil outlet of the first shuttle valve is communicated with a second oil inlet of the second shuttle valve, and an oil outlet of the second shuttle valve is communicated with the brake. According to the hydraulic system of the polar region drilling machine, the brake can be opened when the tool winch stops working, so that the tool winch can move along with the power head of the drilling machine, frequent carrying of the tool winch, a faucet and a driving drill rod is avoided, and the labor intensity of workers is remarkably reduced.

Description

Technical Field

[0001] This utility model relates to the field of polar drilling rig technology, and in particular to a hydraulic system for polar drilling rigs. Background Technology

[0002] Polar drilling rigs are specialized drilling equipment designed for extremely cold environments. They operate under extreme conditions such as temperatures ranging from -50°C to -60°C, strong winds, and snow cover, primarily serving the fields of resource exploration and scientific research. Their core functions include ice penetration, bedrock sampling, and oil and gas development, making them crucial tools for polar resource development and Earth science research. Due to the extreme cold of the polar environment, the labor intensity for personnel is very high, so drilling processes are designed to be as automated, lightweight, and efficient as possible. For example, drill rods can be made of aluminum alloy with steel joints, reducing weight while ensuring strength. Additionally, wireline coring drill rods are provided to accommodate wireline coring techniques.

[0003] Chinese patent document CN105350907A discloses a hydraulic multi-functional drilling rig, including a body platform, a mast mounted on the surface of the body platform, a mast bracket for supporting one end of the mast, and a mast strut for driving the other end of the mast to rotate. A power head for driving the drill bit is slidably mounted on the mast, and a clamp for circumferentially fixing the drill bit is provided at one end of the mast. A power head bracket for supporting itself is provided at the bottom of the power head, and a slide rail is provided on the surface of the mast along its length, with the power head bracket slidably mounted on the slide rail. A chuck for clamping the drill bit 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 aboveground and underground kilometer-long directional drilling rig, comprising: a mast for providing support for the drill rod and drill bit; 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; and a clamping device mounting base mounted on the mast for mounting an aboveground angle-adjusting cylinder or a downhole angle-adjusting cylinder. The clamping device mounting base includes a clamping device mounting plate for mounting a drill rod clamping structure and a connecting plate fixedly connected to the clamping device mounting plate. A feed cylinder mounting base for mounting the power head assembly is located below the connecting plate. A downhole drilling connecting plate is located on the side of the feed cylinder mounting base away from the connecting plate. The power head assembly includes: a feed mechanism located inside the mast; a power head support base mounted on the cylinder barrel of the feed cylinder of the feed mechanism; and a power head mounted on the power head support base. The feeding mechanism includes a feeding cylinder and a feeding mechanism connecting seat mounted on the chassis assembly. When the feeding mechanism is working, the cylinder of the feeding cylinder extends and retracts, causing the power head support seat and the power head 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 for raising and lowering the drill pipe during drilling; and a winch connected to the other end of the wire rope for controlling the raising and lowering of the traveling block.

[0005] Chinese patent document CN118148524A discloses a drill rod gripping robot for a drilling rig, including a mounting frame, a horizontal moving device, a flipping device, and a robot arm. The horizontal moving device is mounted on the mounting frame, and the fixed end of the flipping device is mounted on the horizontal moving device. The movable end of the flipping device is hinged to a first connection point of the robot arm, and a second connection point of the robot arm is hinged to one side of the horizontal moving device. The flipping device pushes the first connection point of the robot arm to rotate around the second connection point so that the gripping axis of the robot arm is parallel to the axis of the drill rod. The robot arm grips and drives the drill rod to move along its axial direction so that the drill rod moves away from or towards the ground. The horizontal moving device, through the robot arm, moves the drill rod to the placement area of ​​the drill rod placement rack.

[0006] The defects and shortcomings of traditional hydraulic multi-functional drilling rigs are as follows: (1) The tool winch of the traditional drilling rig does not move with the power head. Therefore, when adding or removing drill rods, the water tap and active drill rod need to be manually removed and hung on the side of the mast. They are then connected to the drill rod when drilling, which increases the labor intensity of personnel. (2) The power head of the traditional drilling rig is equipped with a high-pressure overflow valve. However, the polar drilling process is complex. When coring with wire ropes, a wire rope coring drill rod is required. However, the wire rope coring drill rod is a small-diameter thin-walled drill rod with low joint strength. If the wire rope is uncoupled according to the set maximum pressure, the threads of the wire rope coring drill rod will be damaged. Utility Model Content

[0007] (a) Technical problems to be solved

[0008] In view of the above-mentioned shortcomings and deficiencies of the prior art, this utility model provides a hydraulic system for polar drilling rigs, which solves the technical problem of the traditional drilling rig's tool winch not being able to move with the power head, so that when adding or removing drill rods, the water tap and active drill rod need to be manually removed and hung on the side of the mast, and then reconnected to the drill rod when drilling, resulting in increased labor intensity for personnel.

[0009] (II) Technical Solution

[0010] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0011] This utility model provides a hydraulic system for a polar drilling rig, including a hydraulic pump station, a multi-way directional valve, and an actuator. The actuator includes a tool winch, a first shuttle valve, a second shuttle valve, and a tool winch follow-up valve.

[0012] The oil outlet and return port of the hydraulic pump station are connected to the corresponding oil ports of the multi-way directional valve. The multi-way directional valve includes a first working link, which is connected to the tool winch to control the movement of the tool winch. The tool winch is equipped with a brake, and a first shuttle valve is installed in the control circuit of the tool winch.

[0013] The oil outlet of the hydraulic pump station is connected to the first oil inlet of the second shuttle valve through the tool winch follower valve. The oil outlet of the first shuttle valve is connected to the second oil inlet of the second shuttle valve. The oil outlet of the second shuttle valve is connected to the brake. When the first working connection is connected to the pipeline between the oil tank of the hydraulic pump station and the tool winch, the tool winch follower valve can output control oil to control the brake to open and release the brake on the tool winch.

[0014] Optionally, the hydraulic pump station may also include a main pump and an auxiliary pump;

[0015] The inlets of the main pump and the auxiliary pump are connected to the outlet of the oil tank, the outlet of the main pump is connected to the inlet of the multi-way directional valve, the return port of the multi-way directional valve is connected to the oil tank, and the outlet of the auxiliary pump is connected to the inlet of the tool winch follower valve.

[0016] Optionally, the tool winch follower valve includes a first pressure reducing valve and a two-position four-way directional valve;

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

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

[0019] Optionally, the main pump is a load-sensitive pump, and the multi-way directional valve is a load-sensitive multi-way valve.

[0020] Optionally, it also includes a two-position two-way directional valve and a low-pressure relief valve, and the actuator also includes a power head motor;

[0021] The load-sensitive multi-way valve also includes a second working link, which is connected to the power head motor to control the rotation direction and rotation speed of the power head motor.

[0022] 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 directional valve. The second working oil port of the two-position two-way directional valve is connected to the inlet of the low-pressure relief valve, and the return oil port of the low-pressure relief valve is connected to the oil tank.

[0023] Optionally, the actuator may also include a salvage winch;

[0024] The load-sensitive multi-way valve also includes a third working link, which is connected to the salvage winch to control the slewing direction and speed of the salvage winch.

[0025] A first bidirectional balancing valve is installed on the pipeline between the third working link and the salvage winch. The first bidirectional balancing valve is used to control the salvage winch to be lowered smoothly and kept in the set position.

[0026] Optionally, the actuator may also include a feed cylinder;

[0027] The load-sensitive multi-way valve also includes a fourth working link, which is connected to the feed cylinder to control the direction and speed of the feed cylinder's movement.

[0028] Optionally, the auxiliary pump is a constant pressure pump.

[0029] Optionally, it also includes a proportional multi-way valve, and the actuator also includes: a left and right translation cylinder, a front and rear translation cylinder, a gripper holding cylinder, a rod feeding motor and a gripper tilting cylinder;

[0030] The outlet of the constant pressure pump is connected to the inlet of the proportional multi-way valve, and the return port of the proportional multi-way valve is connected to the oil tank. The proportional multi-way valve 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 cylinders, the sixth working link is connected to the front and rear translation cylinders, the seventh working link is connected to the gripper holding cylinder, the eighth working link is connected to the rod feeding motor, and the ninth working link is connected to the gripper tilting cylinder.

[0031] Optionally, a hydraulic lock is installed on the pipeline between the seventh working link and the gripper holding cylinder, a second bidirectional balance valve is installed on the pipeline between the eighth working link and the rod feeding motor, and a third bidirectional balance valve is installed on the pipeline between the ninth working link and the gripper tilting cylinder.

[0032] (III) Beneficial Effects

[0033] The beneficial effects of this utility model are as follows: The polar drilling rig hydraulic system of this utility model includes a hydraulic pump station, a multi-way directional valve, and an actuator. The actuator includes a tool winch, a first shuttle valve, a second shuttle valve, and a tool winch follower valve. The oil outlet and return port of the hydraulic pump station are connected to the corresponding oil ports of the multi-way directional valve. The multi-way directional valve includes a first working link, which is connected to the tool winch to control the movement of the tool winch. The tool winch is equipped with a brake, and the first shuttle valve is installed in the control circuit of the tool winch. The oil outlet of the hydraulic pump station is connected to the first oil inlet of the second shuttle valve through the tool winch follower valve. The oil outlet of the first shuttle valve is connected to the second oil inlet of the second shuttle valve. The oil outlet of the second shuttle valve is connected to the brake. When the first working link is connected to the pipeline between the oil tank of the hydraulic pump station and the tool winch, the tool winch follower valve can output control oil to control the brake to open and release the braking of the tool winch. Compared to existing polar drilling rigs, the hydraulic system of this invention connects the oil tank and the tool winch via a first working connection. The first and second working oil ports of the tool winch are directly connected to the oil tank. Hydraulic oil is then supplied to the tool winch's follow-up valve via a hydraulic pump station. This valve outputs control oil, which in turn releases the brake, allowing the tool winch to move synchronously with the power head motor. In other words, the tool winch moves in sync with the power head during drilling. Therefore, the tool winch of this invention can always suspend the swivel and active drill rod, whether drilling or adding / removing drill rods. This avoids frequent handling of the tool winch, swivel, and active drill rod, significantly reducing manual labor intensity.

[0034] This utility model discloses a hydraulic system for a polar drilling rig, comprising a hydraulic pump station, a load-sensitive multi-way valve, a two-position two-way directional 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, and the oil outlet of the load-sensitive pump is connected to the oil inlet of the load-sensitive multi-way valve. The return port of the load-sensitive multi-way valve is connected to the oil tank. The load-sensitive multi-way valve includes a second working link, which is connected to the power head motor to control the rotation direction and 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 port of the load-sensitive pump, and the other branch is connected to the first working port of the two-position two-way directional valve. The second working port of the two-position two-way directional valve is connected to the oil inlet of the low-pressure relief valve, and the 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 this invention employs a load-sensitive pump and a load-sensitive valve to form a load-sensitive system, enabling precise matching of pressure and flow rate with load requirements, ensuring system efficiency and energy saving. Furthermore, the polar drilling rig hydraulic system of this invention has a two-position two-way directional valve and a low-pressure relief valve connected in parallel at the Ls port of the load-sensitive valve. Therefore, when the power head is engaged or disengaged on the wireline coring drill rod, the two-position two-way directional valve can be opened, connecting the pipeline between the LS port of the load-sensitive multi-way valve and the low-pressure relief valve. This reduces the maximum pressure during power head rotation to the set value of the low-pressure relief valve, preventing damage to the threads. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the polar drilling rig hydraulic system of this utility model;

[0036] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the polar drilling rig hydraulic system of this utility model;

[0037] Figure 3 This is a schematic diagram of the structure of Embodiment 4 of the hydraulic system for polar drilling rigs of this utility model.

[0038] [Explanation of Labels in the Attached Image]

[0039] 1: Hydraulic pump station; 101: Load-sensitive pump; 102: Oil tank; 103: Constant pressure pump;

[0040] 2: Load-sensitive multi-way valve; 3: Power head motor; 4: Salvage winch; 5: Tool winch; 6: Feed cylinder; 7: Two-position two-way directional valve; 8: Low-pressure relief valve; 9: Second pressure reducing valve; 10: First pressure reducing valve; 11: Two-position four-way directional valve; 12: Brake; 13: First shuttle valve; 14: Second shuttle valve; 15: First bidirectional balance valve;

[0041] 16: Proportional multi-way valve; 17: Left and right translation cylinder; 18: Front and rear translation cylinder; 19: Gripper holding cylinder; 20: Gripper tilting cylinder; 21: Rod feeding motor; 22: Hydraulic lock; 23: Second bidirectional balance valve; 24: Third bidirectional balance valve; 25: Tool winch follow-up valve. Detailed Implementation

[0042] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] Example 1:

[0044] Reference Figure 1 This embodiment provides a hydraulic system for a polar drilling rig, including a hydraulic pump station 1, a multi-way directional valve and an actuator. The actuator includes a tool winch 5, a first shuttle valve 13, a second shuttle valve 14 and a tool winch follow-up valve 25.

[0045] The oil outlet and return port of the hydraulic pump station 1 are connected to the corresponding oil ports of the multi-way directional valve. The multi-way directional valve includes a first working link, which is connected to the tool winch 5 to control the movement of the tool winch 5. The tool winch 5 is equipped with a brake 12, and a first shuttle valve 13 is provided in the control circuit of the tool winch 5.

[0046] The oil outlet of the hydraulic pump station 1 is connected to the first oil inlet of the second shuttle valve 14 through the follow-up valve of the tool winch 5. The oil outlet of the first shuttle valve 13 is connected to the second oil inlet of the second shuttle valve 14. The oil outlet of the second shuttle valve 14 is connected to the brake 12. When the first working connection is connected to the pipeline between the oil tank 102 of the hydraulic pump station 1 and the tool winch 5, the follow-up valve of the tool winch 5 can output control oil to control the brake 12 to open and release the brake on the tool winch 5.

[0047] The hydraulic system of the polar drilling rig in this embodiment, due to the above-mentioned structure, can connect the oil tank 102 and the tool winch 5 through the pipeline between the first working connection and the oil tank 102. The first working oil port and the second working oil port of the tool winch 5 are directly connected to the oil tank 102. Then, the hydraulic pump station 1 supplies hydraulic oil to the tool winch follower valve 25, so that the tool winch follower valve 25 outputs control oil to control the brake 12 to open and release the brake on the tool winch 5. This allows the tool winch 5 to move together with the power head motor. That is, the tool winch 5 can follow the power head and descend synchronously when drilling. Therefore, the tool winch 5 in this embodiment can always suspend the water tap and the active drill rod when drilling or adding or removing drill rods. This avoids the frequent handling of the tool winch 5, water tap and active drill rod, thereby significantly reducing the intensity of manual labor.

[0048] Furthermore, the hydraulic pump station 1 in this embodiment also includes a main pump and an auxiliary pump. The oil inlets of the main pump and the auxiliary pump are respectively connected to the oil outlet of the oil tank 102. The oil outlet of the main pump is connected to the oil inlet of the multi-way directional valve. The oil return port of the multi-way directional valve is connected to the oil tank 102. The oil outlet of the auxiliary pump is connected to the oil inlet of the tool winch follower valve 5.

[0049] Furthermore, the tool winch follower valve 25 includes a first pressure reducing valve 10 and a two-position four-way directional valve 11. The outlet of the auxiliary pump is connected to the inlet of the first pressure reducing valve 10, and the outlet of the first pressure reducing valve 10 is connected to the first working port of the two-position four-way directional valve 11. The drain port of the first pressure reducing valve 10 and the second working port of the two-position four-way directional valve 11 are both connected to the oil tank 102. The third working port of the two-position four-way directional valve 11 is closed, and the fourth working port of the two-position four-way directional valve 11 is connected to the first inlet of the second shuttle valve 14.

[0050] When the valve core of the two-position four-way directional valve 11 is in the first position, the first working port of the two-position four-way directional valve 11 is connected to the closed third working port, and the second working port of the two-position four-way directional valve 11 is connected to the fourth working port; when the valve core of the two-position four-way directional valve 11 is in the second position, the first working port of the two-position four-way directional valve 11 is connected to the fourth working port, and the second working port of the two-position four-way directional valve 11 is connected to the closed third working port.

[0051] It should be noted that when the first working link is working and supplying oil to the tool winch 5, the two inlets of the first shuttle valve 13 receive input pressure from two different oil circuits respectively. The outlet of the first shuttle valve 13 outputs the oil from the circuit with the higher pressure of the two inlets, while simultaneously closing the other circuit. This drives the brake 12 to release the brake on the tool winch 5, allowing the tool winch 5 to operate normally. When the first working link is not working, the pressure in the control circuit of the tool winch 5 is balanced, and the first shuttle valve 13 cannot draw high-pressure oil. At this time, the brake 12 applies the brake to the tool winch 5.

[0052] When the valve core of the two-position four-way directional valve 11 is in the first position, the second working port of the two-position four-way directional valve 11 is connected to the fourth working port, so that the first inlet of the second shuttle valve 14 is connected to the oil tank 102, that is, the pressure at the first inlet of the second shuttle valve 14 is 0. In this case, if the first working link is working and oil is supplied to the tool winch 5, the first shuttle valve 13 leads out the high-pressure oil in 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 first working link is not working, the pressure in the control circuit of the tool winch 5 is balanced, the first shuttle valve 13 cannot draw high-pressure oil, that is, the pressure at the second inlet of the second shuttle valve 14 is 0, at this time the second shuttle valve 14 cannot lead out high-pressure oil, so the brake 12 brakes the tool winch 5. It should be noted that when the first working connection is not working, it means that the pipeline between the first working oil port and the second working oil port of the tool winch 5 and the oil tank 102 is connected, so that the pressure on both sides of the tool winch 5 is 0.

[0053] When the valve core of the two-position four-way directional valve 11 is in the second position and the auxiliary pump supplies high-pressure oil to the first pressure reducing valve 10, the first working port of the two-position four-way directional valve 11 is connected to the fourth working port. The outlet of the first pressure reducing valve 10 outputs low-pressure oil after pressure reduction, which then passes through the two-position four-way directional valve 11 and the second shuttle valve 14 before entering the brake 12, driving the brake 12 to release the brake on the tool winch 5. The drain port of the first pressure reducing valve 10 then returns excess oil to the oil tank 102 to ensure stable pressure. When the first working connection is not in operation, the constant pressure pump 103 can also drive the brake 12 on the tool winch 5, causing the brake 12 to release the brake on the tool winch 5, thereby allowing the tool winch 5 to move together with the power head.

[0054] The advantage of the tool winch 5 moving in tandem with the power head motor 3 is that it eliminates the need for frequent movement of the swivel and active drill rod, significantly reducing manual labor intensity. Specifically, during drill rod addition and subtraction, the drill rig needs to clear the center channel of the power head. At this time, the tool winch 5 needs to suspend the swivel and active drill rod, while the operator holds them and swings them to the side of the mast for attachment. After drill rod addition and subtraction, during drilling, the swivel and active drill rod need to be connected to the power head and driven downwards. In traditional drilling rigs, the tool winch does not suspend the swivel and active drill rod. Each time drill rod is added or subtracted, the operator needs to constantly move and suspend them between the center channel of the power head and the side of the mast, resulting in high manual labor intensity. In contrast, the tool winch 5 in this embodiment can move down synchronously with the power head during drilling. Therefore, the tool winch 5 in this embodiment can always hold the water tap and the active drill rod, whether drilling or adding or removing drill rods. This avoids the need to frequently move the water tap and the active drill rod, thereby significantly reducing the intensity of manual labor.

[0055] It should be noted that the multi-way directional valve can be any type of directional valve assembly, and the main pump and auxiliary pump can be any type of working pump.

[0056] Furthermore, a heat tracing cable is installed around the pipeline between the hydraulic pump station 1 and the multi-way directional valve. The heat tracing cable uses electrical energy to replenish the heat lost from the pipeline, thereby maintaining the normal temperature of the hydraulic oil in the pipeline.

[0057] Example 2:

[0058] Reference Figure 2 This embodiment provides another polar drilling rig hydraulic system. Based on embodiment 1, the multi-way directional valve in this embodiment is preferably a load-sensitive multi-way valve 2, the main pump is preferably a load-sensitive pump 101, and the auxiliary pump is preferably a constant pressure pump 103. The polar drilling rig hydraulic system in this embodiment also includes a two-position two-way directional valve 7 and a low-pressure relief valve 8. The actuators also include a power head motor 3, a retrieval 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 to drive the drill bit to break rocks or formations; the retrieval winch 4 is mainly used for lowering and retrieving the inner core tube; the tool winch 5 is mainly used to assist drilling operations, including lifting and lowering various tools and equipment. The feed cylinder 6 is used to control the axial feed movement of the drill string (drill pipe, drill bit) to achieve precise adjustment of drilling pressure, raising and lowering of the drill string, and to meet the drilling needs of complex formations.

[0059] 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, and 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 second working link, which is connected to the power head motor 3 to control the rotation direction and rotation speed of the power head motor 3.

[0060] The LS port of the load-sensitive multi-way valve 2 is divided into two branches. One branch is connected to the control oil port of the load-sensitive pump 101, and the other branch is connected to the first working oil port of the two-position two-way directional valve 7. The second working oil port of the two-position two-way directional valve 7 is connected to the oil inlet of the low-pressure relief valve 8, and the oil return port of the low-pressure relief valve 8 is connected to the oil tank 102.

[0061] It should be noted that the LS port of the load-sensitive multi-way valve 2 is the load-sensitive port. The load-sensitive multi-way valve 2 can monitor the load pressure of each actuator in the hydraulic system in real time and transmit the highest load pressure P. LS Feedback is sent to the load-sensitive pump 101, forming a closed-loop control. The load-sensitive pump 101 can respond to the P feedback from the load-sensitive multi-way valve 2. LS The signal, by adjusting the pump displacement (such as swashplate angle or plunger stroke), matches the system's required flow rate in real time, avoiding the generation of excess flow. The pump outlet pressure P of the load-sensitive pump 101... 泵出口 Always higher than the system's highest load pressure P LS The pressure difference is higher than a fixed differential pressure ΔP. A two-position, two-way directional valve 7 is a basic hydraulic control element with two working positions and two passages, mainly used to control the flow of hydraulic oil, thus connecting or disconnecting pipelines. A low-pressure relief valve 8 is a pressure control valve, mainly used in hydraulic systems to control oil pressure and prevent system pressure from exceeding the set value.

[0062] The working process of the polar drilling rig hydraulic system in this embodiment is as follows: When the power head motor 3 rotates normally to drive other drill rods besides the wireline coring drill rod to perform drilling operations, the two-position two-way directional valve 7 cuts off the pipeline between the LS port of the load-sensitive multi-way valve 2 and the low-pressure relief valve 8, so that the hydraulic oil flowing out of the LS port of the load-sensitive multi-way valve 2 flows completely to the control port of the load-sensitive pump 101. The pump outlet pressure of the load-sensitive pump 101 is adjusted according to the following formula:

[0063] P 泵出口 =P LS1 +ΔP

[0064] Among them, P 泵出口 The outlet pressure of the load-sensitive pump 101;

[0065] P LS1 The pressure at the LS port of the load-sensitive multi-way valve 2;

[0066] ΔP is a fixed pressure difference, ranging from 1.4 to 2.2 MPa.

[0067] It should be noted that drill pipes other than wireline coring drill pipes can be drill pipes with aluminum alloy bodies and steel joints. Due to the high strength of the steel joints, they can withstand the highest pressure of the hydraulic system; at this time, the oil circuit between the low-pressure relief valve 8 and the Ls port of the load-sensitive multi-way valve 2 is cut off by the two-position two-way directional valve 7, and the pump outlet pressure of the load-sensitive pump 101 is output according to the highest load pressure of the actuator.

[0068] When the power head motor 3 of this embodiment drills the wireline coring drill rod, due to the low strength of the joint of the wireline coring drill rod, the rotational pressure during threading and unthreading will reach the system's maximum pressure, thereby damaging the threads of the wireline coring drill rod. To solve the above problem, the load-sensitive pump 101 needs to reduce the pump outlet pressure P. 泵出口 At this time, the two-position two-way directional valve 7 connects the pipeline between the LS port of the load-sensitive multi-way valve 2 and the low-pressure relief valve 8. Part of the hydraulic oil flowing from the LS port of the load-sensitive multi-way valve 2 flows to the control port of the load-sensitive 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 At this time, the outlet pressure of the load-sensitive pump 101 is adjusted according to the following formula:

[0069] P 泵出口 =P LS2 +ΔP

[0070] Among them, P 泵出口 The outlet pressure of the load-sensitive pump 101;

[0071] P LS2 The pressure at the LS port of the load-sensitive multi-way valve 2, and P LS2 The set pressure P of the low-pressure relief valve 8 is less than or equal to the set pressure. 设定 ;

[0072] ΔP is a fixed pressure difference, ranging from 1.4 to 2.2 MPa.

[0073] In this embodiment, the hydraulic system of the polar drilling rig connects the low-pressure relief valve 8 to the Ls oil circuit of the load-sensitive multi-way valve 2 through a two-position two-way reversing valve. This reduces the maximum pump outlet pressure of the load-sensitive pump 101 to the set value of the low-pressure relief valve 8, thereby reducing the rotation torque and protecting the threads of the wireline coring drill rod.

[0074] Furthermore, the polar drilling rig hydraulic system of this embodiment also includes a second pressure reducing valve 9. 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 second pressure reducing valve 9, the oil drain port of the second pressure reducing valve 9 is connected to the oil tank 102, and the oil outlet of the second 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 second pressure reducing valve 9, the oil outlet of the second pressure reducing valve 9 can output low-pressure oil after pressure reduction to the control oil port of the power head motor 3, thereby controlling the displacement of the power head motor 3, and the oil drain port of the second pressure reducing valve 9 returns excess oil to the oil tank 102 to ensure pressure stability.

[0075] In this embodiment, the hydraulic system of the polar drilling rig delivers control oil to the power head motor 3 through the constant pressure pump 103 and the second pressure reducing valve 9. The control oil drives the servo valve core of the power head motor 3 to move, thereby controlling the displacement of the power head motor 3. This allows for dynamic adjustment of the output torque and speed of the power head motor 3, optimizing system efficiency and adapting to complex working conditions.

[0076] In this embodiment, the load-sensitive multi-way valve 2 also includes a third working link, which is connected to the salvage winch 4 and used to control the rotation direction and speed of the salvage winch 4. A first bidirectional balancing valve 15 is installed on the pipeline between the third working link and the salvage winch 4. The first bidirectional balancing valve 15 is used to control the salvage winch 4 to be lowered smoothly and held in a set position.

[0077] It should be noted that the first bidirectional balance valve 15 is installed in the control circuit of the salvage winch 4 to balance the pressure and control the flow of the liquid circuit, so that the salvage winch 4 is lowered smoothly and the salvage winch 4 remains in the set position when it stops.

[0078] In this embodiment, the load-sensitive multi-way valve 2 also includes a fourth working link, which is connected to the feed cylinder 6 to control the direction and speed of the feed cylinder 6.

[0079] Furthermore, a pipeline is installed between the fourth working link and the rod chamber of the feed cylinder 6.

[0080] A first pressure gauge and a second pressure gauge are installed on the pipeline between the fourth working link and the rodless chamber of the feed cylinder 6. It should be noted that both the first and second pressure gauges are low-temperature resistant pressure gauges.

[0081] The polar drilling rig in this embodiment can be equipped with a 3-meter drill rod to reduce the frequency of attaching and detaching the drill rod and improve drilling efficiency.

[0082] The remaining parts that are the same as in Example 1 will not be repeated here.

[0083] Example 3:

[0084] This embodiment provides a control method for the hydraulic system of the polar drilling rig described in Embodiment 2, including the following steps:

[0085] When the polar drilling rig is drilling other drill rods besides the wireline coring drill rod, the two-position two-way directional valve 7 cuts off the pipeline between the LS port of the load-sensitive multi-way valve 2 and the low-pressure relief valve 8. The load-sensitive pump 101 pumps the hydraulic oil from the oil tank 102 to the load-sensitive multi-way valve 2. The hydraulic oil flowing out of the LS port of the load-sensitive multi-way valve 2 flows completely to the control port of the load-sensitive pump 101. The pump outlet pressure of the load-sensitive pump 101 is adjusted according to the following formula:

[0086] P 泵出口 =P LS1 +ΔP

[0087] Among them, P 泵出口 The outlet pressure of the load-sensitive pump 101;

[0088] P LS1 The pressure at the LS port of the load-sensitive multi-way valve 2;

[0089] ΔP is a fixed pressure difference, ranging from 1.4 to 2.2 MPa;

[0090] When the polar drilling rig is drilling the wireline coring drill rod, the two-position two-way directional valve 7 connects the pipeline between the LS port of the load-sensitive multi-way valve 2 and the low-pressure relief valve 8. The load-sensitive pump 101 pumps the hydraulic oil from the oil tank 102 to the load-sensitive multi-way valve 2. Part of the hydraulic oil flowing out of the LS port of the load-sensitive multi-way valve 2 flows to the control port of the load-sensitive pump 101, and the other part flows to the low-pressure relief valve 8. At this time, the pump outlet pressure of the load-sensitive pump 101 is adjusted according to the following formula:

[0091] P 泵出口 =P LS2 +ΔP

[0092] Among them, P 泵出口 The outlet pressure of the load-sensitive pump 101;

[0093] P LS2 The pressure at the LS port of the load-sensitive multi-way valve 2, and P LS2 The set pressure P of the low-pressure relief valve 8 is less than or equal to the set pressure. 设定 ;

[0094] ΔP is a fixed pressure difference, ranging from 1.4 to 2.2 MPa.

[0095] The remaining parts that are the same as in Example 2 will not be repeated here.

[0096] Example 4:

[0097] The polar drilling rig in this embodiment can be equipped with an automated drill rod manipulator, which reduces the labor intensity of personnel during the drilling process and improves work efficiency.

[0098] See Figure 3 This embodiment provides another polar drilling rig hydraulic system, which also includes a proportional multi-way valve 16. The actuators also include: a left-right translation cylinder 17, a front-back translation cylinder 18, a gripper 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 front-back translation cylinder 18, the gripper cylinder 19, the rod feed motor 21, and the gripper tilting cylinder 20 serve as the actuators for the drill rod gripping manipulator of the drilling rig. The gripper cylinder 19 drives the manipulator's grippers to grip the drill rod; the left-right translation cylinder 17 drives the manipulator to move left and right carrying the drill rod; the front-back translation cylinder 18 drives the manipulator to move front and back carrying the drill rod; the gripper tilting cylinder 20 drives the manipulator to tilt carrying the drill rod to adjust the drill rod's posture; and the rod feed motor 21 drives the drill rod to move along its axial direction.

[0099] 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 proportional multi-way valve 16. The 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 gripper holding cylinder 19, the eighth working link is connected to the rod feeding motor 21, and the ninth working link is connected to the gripper tilting cylinder 20.

[0100] Furthermore, a hydraulic lock 22 is installed on the pipeline between the seventh working link and the gripper cylinder 19; a second two-way balance valve 23 is installed on the pipeline between the eighth working link and the rod feed motor 21; and a third two-way balance 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 hydraulic fluid in the cylinder, keeping the cylinder stationary for a longer period. The hydraulic lock 22 ensures smooth operation of the actuator and locks it when stopped.

[0101] The remaining parts that are the same as in Example 2 will not be repeated here.

[0102] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0103] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0104] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0105] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0106] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A polar rig hydraulic system characterized by: The hydraulic pump station (1), the multi-way directional valve and the actuator, the actuator includes a tool winch (5), a first shuttle valve (13), a second shuttle valve (14) and a tool winch follow-up valve (25); The oil outlet and the oil return of the hydraulic pump station (1) are communicated with the corresponding oil ports of the multi-way directional valve, the multi-way directional valve includes a first working connection, the first working connection is communicated with the tool winch (5) to control the action of the tool winch (5), the tool winch (5) is provided with a brake (12), and the control circuit of the tool winch (5) is provided with the first shuttle valve (13); The oil outlet of the hydraulic pump station (1) is communicated with the first oil inlet of the second shuttle valve (14) through the tool winch follow-up valve (25), the oil outlet of the first shuttle valve (13) is communicated with the second oil inlet of the second shuttle valve (14), and the oil outlet of the second shuttle valve (14) is communicated with the brake (12); when the first working connection communicates the pipeline between the oil tank (102) of the hydraulic pump station (1) and the tool winch (5), the tool winch (5) follow-up valve can output control oil to control the brake (12) to open and release the brake of the tool winch (5).

2. The polar rig hydraulic system of claim 1, wherein: The hydraulic pump station (1) further includes a main pump and an auxiliary pump; The oil inlets of the main pump and the auxiliary pump are respectively communicated with the oil outlet of the oil tank (102), the oil outlet of the main pump is communicated with the oil inlet of the multi-way directional valve, the oil return of the multi-way directional valve is communicated with the oil tank (102), and the oil outlet of the auxiliary pump is communicated with the oil inlet of the tool winch follow-up valve (25).

3. The polar rig hydraulic system of claim 2, wherein: The tool winch follow-up valve (25) includes a first pressure reducing valve (10) and a two-position four-way directional valve (11); The oil outlet of the auxiliary pump is communicated with the oil inlet of the first pressure reducing valve (10), the oil outlet of the first pressure reducing valve (10) is communicated with the first working oil port of the two-position four-way directional valve (11), the oil drain port of the first pressure reducing valve (10) and the second working oil port of the two-position four-way directional valve (11) are both communicated with the oil tank (102); the third working oil port of the two-position four-way directional valve (11) is closed, and the fourth working oil port of the two-position four-way directional valve (11) is communicated with the first oil inlet of the second shuttle valve (14); When the spool of the two-position four-way directional valve (11) is located at the first position, the first working oil port of the two-position four-way directional valve (11) is communicated with the closed third working oil port, and the second working oil port of the two-position four-way directional valve (11) is communicated with the fourth working oil port; when the spool of the two-position four-way directional valve (11) is located at the second position, the first working oil port of the two-position four-way directional valve (11) is communicated with the fourth working oil port, and the second working oil port of the two-position four-way directional valve (11) is communicated with the closed third working oil port.

4. The polar rig hydraulic system of claim 2, wherein: The main pump is a load sensing pump (101), and the multi-way directional valve is a load sensing multi-way valve (2).

5. The polar rig hydraulic system of claim 4, wherein: Further including a two-position two-way directional valve (7) and a low-pressure overflow valve (8), and the actuator further includes a power head motor (3); The load sensing multi-way valve (2) further includes a second working connection, the second working connection is communicated with the power head motor (3) to control the rotation direction and rotation speed of the power head motor (3); The load sensing multi-way valve (2) further includes a second working connection, the second working connection is communicated with 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 of which is in communication with the control oil port of the load-sensing pump (101), and the other is in communication with 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 in communication with the oil inlet of the low-pressure overflow valve (8), and the oil return port of the low-pressure overflow valve (8) is in communication with the oil tank (102).

6. The polar rig hydraulic system of claim 4, wherein: The actuator further comprises a fishing winch (4); The load-sensing multi-way valve (2) further comprises a third working connection, which is in communication with the fishing winch (4) and is used to control the rotation direction and rotation speed of the fishing winch (4); A first bidirectional balance valve (15) is arranged on the pipeline between the third working connection and the fishing winch (4), and the first bidirectional balance valve (15) is used to control the fishing winch (4) to be lowered smoothly and kept at a set position.

7. The polar rig hydraulic system of claim 4, wherein: The actuator further comprises a feeding oil cylinder (6); The load-sensing multi-way valve (2) further comprises a fourth working connection, which is in communication with the feeding oil cylinder (6) and is used to control the action direction and action speed of the feeding oil cylinder (6).

8. The polar rig hydraulic system of claim 2, wherein: The auxiliary pump is a constant pressure pump (103).

9. The polar rig hydraulic system of claim 8, wherein: Further comprising a proportional multi-way valve (16), the actuator further comprises: left and right translation oil cylinders (17), front and rear translation oil cylinders (18), jaw clamping oil cylinders (19), rod feeding motors (21) and jaw tilting oil cylinders (20); The oil outlet of the constant pressure pump (103) is in communication with the oil inlet of the proportional multi-way valve (16), the oil return port of the proportional multi-way valve (16) is in communication with the oil tank (102), the proportional multi-way valve (16) comprises a fifth working connection, a sixth working connection, a seventh working connection, an eighth working connection and a ninth working connection, the fifth working connection is in communication with the left and right translation oil cylinders (17), the sixth working connection is in communication with the front and rear translation oil cylinders (18), the seventh working connection is in communication with the jaw clamping oil cylinders (19), the eighth working connection is in communication with the rod feeding motor (21), and the ninth working connection is in communication with the jaw tilting oil cylinder (20).

10. The polar rig hydraulic system of claim 9, wherein: A hydraulic lock (22) is arranged on the pipeline between the seventh working connection and the jaw clamping oil cylinder (19), a second bidirectional balance valve (23) is arranged on the pipeline between the eighth working connection and the rod feeding motor (21), and a third bidirectional balance valve (24) is arranged on the pipeline between the ninth working connection and the jaw tilting oil cylinder (20).

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