A full hydraulic load-sensitive constant power control drilling rig hydraulic system

Abstract

The present application relates to a kind of full hydraulic load-sensitive constant power control rig hydraulic system, including hydraulic pump station, load-sensitive multi-way valve and actuator, hydraulic pump station includes load-sensitive constant power pump and oil tank, the oil outlet of oil tank is communicated with the oil inlet of load-sensitive constant power pump, the oil outlet of load-sensitive constant power pump is communicated with the oil inlet of load-sensitive multi-way valve, the oil return port of load-sensitive multi-way valve is communicated with oil tank, the LS port of load-sensitive multi-way valve is communicated with the control oil port of load-sensitive constant power pump, load-sensitive multi-way valve is communicated with actuator, so that the hydraulic oil output by hydraulic pump station is regulated after entering actuator by load-sensitive multi-way valve, to control the action of actuator.The rig hydraulic system of the present application, the actual load pressure of actuator is fed back to load-sensitive constant power pump by load-sensitive multi-way valve, load-sensitive constant power pump can respond to load change in real time, reduce energy waste, improve system energy efficiency and stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drilling rig equipment, and particularly relates to a full-hydraulic load-sensitive constant-power control drilling rig hydraulic system. BACKGROUND

[0002] The drilling rig is a mechanical equipment for driving a drilling tool to drill into the ground and obtaining physical geological data in the exploration and development of mineral resources. The main function is to drive the drilling tool to break the rock at the bottom of the hole and to lower or raise the drilling tool in the hole. With the continuous development of geological drilling construction, the requirements for drilling equipment are becoming higher and higher, including the reliability, energy consumption, efficiency, system simplification and mobility of the drilling rig.

[0003] Chinese patent document CN118997661A discloses a ground-underground integrated kilometer directional drilling rig, comprising: a mast for providing support for a drill rod and a drill bit of the drilling rig; a power head assembly arranged on the mast for driving the drill rod and the drill bit to perform drilling operation; and a chassis assembly arranged below the mast. The power head assembly comprises: a feeding mechanism arranged inside the mast; a power head support seat arranged on a feeding oil cylinder barrel of the feeding mechanism; and a power head arranged on the power head support seat. The feeding mechanism comprises the feeding oil cylinder and a feeding mechanism connecting seat arranged on the chassis assembly. When the feeding mechanism works, the cylinder barrel of the feeding oil cylinder extends and retracts, driving the power head support seat and the power head thereon to move synchronously. The drilling rig further comprises: a steel wire rope arranged on the mast; a traveling block for lifting and lowering the drill rod during drilling, connected with one end of the steel wire rope and an upper end of the drill rod respectively; and a winch connected with the other end of the steel wire rope for controlling the lifting and lowering of the traveling block.

[0004] Chinese patent document CN119664240A discloses a directional drilling hydraulic system of a kilometer directional drilling rig, comprising a hydraulic pump station, a walking unit, a drilling main unit, a drilling auxiliary unit and a stabilizing unit. The hydraulic pump station is used for outputting high-pressure oil to provide power for the entire hydraulic system. The walking unit is used for controlling the track vehicle body of the drilling rig to complete the walking action of the drilling rig. The drilling main unit is used for providing the drilling rig to complete the drilling rotation and feeding actions. The drilling auxiliary unit is used for controlling the gripper, the hydraulic chuck and the brake device to complete the clamping or loosening of the hydraulic chuck, the clamping or loosening of the gripper and the drilling auxiliary action of the brake device. The stabilizing unit is used for controlling the oil cylinder to complete the stabilizing and angle adjusting actions of the drilling rig.

[0005] The hydraulic system of the conventional drilling machine has the following disadvantages and defects: (1) the conventional drilling machine adopts a constant quantity system or a constant pressure variable system, which causes the power to be not matched with the actual working condition of the drilling machine, and power is wasted; (2) the hydraulic system of the conventional drilling machine is provided with multiple oil pumps, and the actions without composite requirements are controlled, so that the hydraulic system is complex and large; (3) the conventional drilling machine is manually controlled, the operation table is heavy and large in size, the maneuverability is poor, the degree of automation is low, and the operation comfort is low; and (4) the conventional drilling machine lacks hydraulic interlocking, so that the clamp cannot keep the pressure, and the drill pipe slipping accident occurs.

[0006] Therefore, it is urgent to provide a drilling machine hydraulic system with high power utilization rate, high energy saving and efficiency, simple system, high degree of automation and high reliability. SUMMARY

[0007] (I) Technical problems to be solved

[0008] In view of the above disadvantages and defects of the prior art, the present application provides a drilling machine hydraulic system with full hydraulic load sensing constant power control, which solves the technical problems of low operation comfort, low reliability of the conventional drilling machine, and the power being not matched with the actual working condition of the drilling machine caused by the constant quantity system or the constant pressure variable system, thereby causing power waste.

[0009] (II) Technical solutions

[0010] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the present application include:

[0011] The present application provides a drilling machine hydraulic system with full hydraulic load sensing constant power control, which includes a hydraulic pump station, a load sensing multi-way valve and an actuator.

[0012] The hydraulic pump station includes a load sensing constant power pump and an oil tank, the oil outlet of the oil tank is communicated with the oil inlet of the load sensing constant power pump, the oil outlet of the load sensing constant power pump is communicated with the oil inlet of the load sensing multi-way valve, the oil return port of the load sensing multi-way valve is communicated with the oil tank, the LS port of the load sensing multi-way valve is communicated with the control oil port of the load sensing constant power pump, and the load sensing multi-way valve is communicated with the actuator, so that the hydraulic oil output by the hydraulic pump station enters the actuator after being regulated and controlled by the load sensing multi-way valve, to control the action of the actuator.

[0013] Optionally, the actuator includes a feeding oil cylinder.

[0014] The load sensing multi-way valve includes a first working link, the first working link has a first working port and a second working port, the first working port is communicated with the rod cavity of the feeding oil cylinder, and the second working port is communicated with the rodless cavity of the feeding oil cylinder.

[0015] Optionally, the drilling rig hydraulic system further comprises a clamping multi-way valve and a slow drilling reversing valve, the actuator further comprises a clamping cylinder, and the hydraulic pump station further comprises a constant pressure pump;

[0016] The oil inlet of the constant pressure pump is communicated with the oil tank, the oil outlet of the constant pressure pump is communicated with the oil inlet of the clamping multi-way valve, the clamping multi-way valve has a third working port and a fourth working port, the third working port is communicated with the rodless cavity of the clamping cylinder, and the fourth working port is communicated with the rod cavity of the clamping cylinder;

[0017] The HPCO port of the clamping multi-way valve is communicated with the oil inlet of the slow drilling reversing valve, the oil return ports of the clamping multi-way valve and the slow drilling reversing valve are communicated with the oil tank, the slow drilling reversing valve has a fifth working port and a sixth working port, the fifth working port is communicated with the rod cavity of the feeding cylinder, and the sixth working port is communicated with the rodless cavity of the feeding cylinder.

[0018] Optionally, the drilling rig hydraulic system further comprises a first reversing valve, a first manual proportional pressure reducing overflow valve and a first electric proportional pressure reducing overflow valve;

[0019] The parallel manual proportional pressure reducing overflow valve and the electric proportional pressure reducing overflow valve are arranged on the pipeline between the sixth working port of the slow drilling reversing valve and the rodless cavity of the feeding cylinder, and the second working port of the first working connection is communicated with the oil outlets of the manual proportional pressure reducing overflow valve and the electric proportional pressure reducing overflow valve.

[0020] Optionally, the clamping multi-way valve has three working positions:

[0021] When the clamping multi-way valve is switched to the first position, the oil inlet of the clamping multi-way valve is communicated with the third working port of the clamping multi-way valve, the oil return port of the clamping multi-way valve is communicated with the fourth working port of the clamping multi-way valve, so that the hydraulic oil enters the rodless cavity of the clamping cylinder, the piston rod of the clamping cylinder is driven to extend, and the drilling tool is clamped;

[0022] When the clamping multi-way valve is switched to the second position, the third working port and the fourth working port of the clamping multi-way valve are both communicated with the oil return port of the clamping multi-way valve, the oil inlet of the clamping multi-way valve is communicated with the HPCO port of the clamping multi-way valve, so that the hydraulic oil enters the slow drilling reversing valve, and the action of the feeding cylinder is controlled after being regulated by the slow drilling reversing valve;

[0023] When the clamping multi-way valve is switched to the third position, the oil inlet of the clamping multi-way valve is communicated with the fourth working port of the clamping multi-way valve, and the oil return port of the clamping multi-way valve is communicated with the third working port of the clamping multi-way valve, so that the hydraulic oil enters the rod cavity of the clamping cylinder, the piston rod of the clamping cylinder is driven to retract, and the drilling tool is loosened.

[0024] Optionally, the drilling rig hydraulic system further comprises a first reversing valve, a first manual proportional pressure reducing overflow valve and a first electric proportional pressure reducing overflow valve;

[0025] The HPCO port of the clamping multi-way valve is communicated with the oil inlet ports of the first manual proportional pressure reducing overflow valve and the first electric proportional pressure reducing overflow valve, the oil outlet ports of the first manual proportional pressure reducing overflow valve and the first electric proportional pressure reducing overflow valve are communicated with the oil tank, the oil outlet port of the first manual proportional pressure reducing overflow valve is communicated with the first working oil port of the first directional valve, the oil outlet port of the first electric proportional pressure reducing overflow valve is communicated with the second working oil port of the first directional valve, and the third working oil port of the first directional valve is communicated with the oil inlet port of the slow drilling directional valve.

[0026] Optionally, the slow drilling directional valve comprises a three-position four-way directional valve.

[0027] The first working oil port of the three-position four-way directional valve is communicated with the oil inlet port of the slow drilling directional valve, the second working oil port of the three-position four-way directional valve is communicated with the oil return port of the slow drilling directional valve, the third working oil port of the three-position four-way directional valve is communicated with the fifth working port of the slow drilling directional valve, and the fourth working oil port of the three-position four-way directional valve is communicated with the sixth working port of the slow drilling directional valve.

[0028] When the three-position four-way directional valve is switched to the first position, the first working oil port and the third working oil port of the three-position four-way directional valve are communicated, and the second working oil port and the fourth working oil port of the three-position four-way directional valve are communicated, so that the hydraulic oil enters the rod cavity of the feeding cylinder.

[0029] When the three-position four-way directional valve is switched to the second position, the first working oil port, the second working oil port, the third working oil port and the fourth working oil port of the three-position four-way directional valve are disconnected with each other, so that the feeding cylinder stops working.

[0030] When the three-position four-way directional valve is switched to the third position, the first working oil port and the fourth working oil port of the three-position four-way directional valve are communicated, and the second working oil port and the third working oil port of the three-position four-way directional valve are communicated, so that the hydraulic oil enters the rodless cavity of the feeding cylinder.

[0031] Optionally, the slow drilling directional valve further comprises a two-position four-way directional valve arranged in parallel with the three-position four-way directional valve.

[0032] The first working oil port and the second working oil port of the two-position four-way directional valve are both communicated with the oil return port of the slow drilling directional valve, the third working oil port of the two-position four-way directional valve is communicated with the fifth working port of the slow drilling directional valve, and the fourth working oil port of the two-position four-way directional valve is communicated with the sixth working port of the slow drilling directional valve.

[0033] When the two-position four-way directional valve is switched to the first position, the first working oil port, the second working oil port, the third working oil port and the fourth working oil port of the two-position four-way directional valve are disconnected with each other.

[0034] When the two-position four-way directional valve is switched to the second position, the first working port of the two-position four-way directional valve is connected to the third working port, and the second working port of the two-position four-way directional valve is connected to the fourth working port, so that both the rod chamber and the rodless chamber of the feed cylinder are connected to the oil tank to achieve floating.

[0035] Optionally, the actuator may also include a mud pump, a rope winch, and a power head rotary motor;

[0036] The load-sensitive multi-way valve also includes a second working link, a third working link, and a fourth working link. The second working link is connected to the mud pump, the third working link is connected to the rope winch, and the fourth working link is connected to the power head rotary motor.

[0037] Optionally, the drilling rig hydraulic system also includes a second directional valve, a second manual proportional pressure reducing relief valve, and a second electric proportional pressure reducing relief valve;

[0038] P of load-sensitive multi-way valve P The ports are respectively connected to the oil inlets of the second manual proportional pressure reducing relief valve and the second electric proportional pressure reducing relief valve, and the oil drain ports of the second manual proportional pressure reducing relief valve and the second electric proportional pressure reducing relief valve are connected to the oil tank.

[0039] The oil outlet of the second manual proportional pressure reducing relief valve is connected to the first working oil port of the second directional valve, and the oil outlet of the second electric proportional pressure reducing relief valve is connected to the second working oil port of the second directional valve.

[0040] The second working link has a control port and a seventh working port. The third working port of the second directional valve is connected to the control port of the second working link, the seventh working port is connected to the first working port of the mud pump, and the second working port of the mud pump is connected to the oil tank.

[0041] (III) Beneficial Effects

[0042] The beneficial effects of this invention are as follows: The fully hydraulic load-sensitive constant power control drilling rig hydraulic system of this invention includes a hydraulic pump station, a load-sensitive multi-way valve, and an actuator. The hydraulic pump station includes a load-sensitive constant power pump and an oil tank. The oil outlet of the oil tank is connected to the oil inlet of the load-sensitive constant power pump, the oil outlet of the load-sensitive constant power 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 LS port of the load-sensitive multi-way valve is connected to the control port of the load-sensitive constant power pump, and the load-sensitive multi-way valve is connected to the actuator. This allows the hydraulic oil output from the hydraulic pump station to enter the actuator after being regulated by the load-sensitive multi-way valve, thereby controlling the actuator's movement. Compared to existing drilling rig hydraulic systems, this system uses a load-sensitive constant power pump and a load-sensitive multi-way valve to form a load-sensitive system. The load-sensitive multi-way valve has an LS port for feeding back the actual load pressure of the actuator to the load-sensitive constant power pump. The load-sensitive constant power pump can respond to load changes in real time, reducing energy waste and improving system energy efficiency and stability. Specifically, when the load pressure is lower than the power set point, the system supplies oil according to the required flow rate and pressure of the load, realizing a load-sensitive system that is energy-saving and efficient; when the load pressure reaches the power set point, the system still supplies oil according to the load pressure, but reduces the flow rate, and the system outputs at a constant power value to prevent power stalling, thereby adapting to the high-speed, low-torque and low-speed, high-torque working conditions of the drilling rig and making full use of the engine power. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the drilling rig hydraulic system with full hydraulic load-sensitive constant power control according to the present invention;

[0044] Figure 2 for Figure 1 An enlarged schematic diagram of the hydraulic system of the drilling rig at the clamping multi-way valve and the slow drilling directional valve;

[0045] Figure 3 for Figure 1 An enlarged schematic diagram of the hydraulic system of the drilling rig, including the load-sensitive multi-way valve, the power head rotary motor, the cable winch, and the mud pump.

[0046] [Explanation of Labels in the Attached Image]

[0047] 1: hydraulic pump station; 101: load-sensitive constant-power pump; 102: oil tank; 103: constant-pressure pump; 2: load-sensitive multi-way valve; 3: power head rotary motor; 4: rope winch; 5: mud pump; 6: feeding oil cylinder; 7: clamping oil cylinder; 8: clamping multi-way valve; 9: slow drilling reversing valve; 10: first reversing valve; 11: first manual proportional pressure-reducing overflow valve; 12: first electric proportional pressure-reducing overflow valve; 13: hydraulic lock; 14: second reversing valve; 15: second manual proportional pressure-reducing overflow valve; 16: second electric proportional pressure-reducing overflow valve; 17: brake; 18: shuttle valve; 19: balance valve; 21: two-position four-way reversing valve; 22: three-position four-way reversing valve; 23: manual speed regulating valve; 24: electric proportional speed regulating valve. DETAILED DESCRIPTION

[0048] In order to better explain the present application, so as to be understood, the present application is described in detail below by specific embodiments in combination with the drawings.

[0049] Embodiment 1

[0050] With reference to Figure 1 , Figure 2 and Figure 3 , the present embodiment provides a full-hydraulic load-sensitive constant-power controlled drilling rig hydraulic system, comprising a hydraulic pump station 1, a load-sensitive multi-way valve 2 and an actuator.

[0051] The hydraulic pump station 1 comprises a load-sensitive constant-power pump 101 and an oil tank 102, the oil outlet of the oil tank 102 is in communication with the oil inlet of the load-sensitive constant-power pump 101, the oil outlet of the load-sensitive constant-power pump 101 is in communication with the oil inlet of the load-sensitive multi-way valve 2, the oil return port of the load-sensitive multi-way valve 2 is in communication with the oil tank 102, the LS port of the load-sensitive multi-way valve 2 is in communication with the control oil port of the load-sensitive constant-power pump 101, and the load-sensitive multi-way valve 2 is in communication with the actuator, so that the hydraulic oil output by the hydraulic pump station 1 enters the actuator after being regulated by the load-sensitive multi-way valve 2, to control the action of the actuator.

[0052] The full-hydraulic load-sensitive constant-power controlled drilling rig hydraulic system of the present embodiment adopts a load-sensitive system composed of a load-sensitive constant-power pump 101 and a load-sensitive multi-way valve 2, and the load-sensitive multi-way valve 2 is provided with an LS port (load-sensitive port) for feeding back the actual load pressure of the actuator to the load-sensitive constant-power pump 101, so that the load-sensitive constant-power pump 101 can respond to the load change in real time, reduce energy waste, and improve the energy efficiency and stability of the system. Specifically, the load-sensitive constant-power pump 101 of the present embodiment has the following two functions:

[0053] First, pressure-flow matching: the load-sensitive constant-power pump 101 receives the load pressure P L, the output flow and pressure of the pump are adjusted to ensure that the output pressure of the pump is only higher than the load pressure P L by a set pressure difference, usually 20 bar, so that the output flow pressure of the pump is matched with the load.

[0054] Second, constant power regulation: the constant power control module built in the load-sensitive constant power pump 101 monitors P L × Q in real time, and when the load pressure P L rises, the pump keeps the power P L × Q from exceeding a set limit A by reducing the flow Q. That is, when P L reaches the set maximum power of the load-sensitive constant power pump 101, the load-sensitive constant power pump 101 of the embodiment enters the constant power mode:

[0055]

[0056] When the load pressure P L rises, the flow Q is automatically reduced to avoid overloading of the drive motor; if the load pressure P L rises to the cut-off pressure of the load-sensitive constant power pump 101, the swash plate angle of the load-sensitive constant power pump 101 is substantially zero, and the output flow is only maintained at the set maximum pressure to prevent system overpressure.

[0057] The main pump of the full-hydraulic load-sensitive constant power control drilling rig hydraulic system of the embodiment adopts the load-sensitive constant power pump 101, which forms a load-sensitive constant power system with the load-sensitive multi-way valve 2. The system can control the rotary head, the fast feed oil cylinder, the mud pump, and the drawworks. When the load pressure is lower than the power setting point, the system supplies oil according to the load required flow pressure to realize the load-sensitive system and save energy; when the load pressure reaches the power setting point, the system still supplies oil according to the load pressure, but reduces the flow, and the system outputs according to the constant power value to prevent power failure, so as to adapt to the high-speed small-torque and low-speed large-torque working conditions of the drilling rig and make full use of the engine power.

[0058] In the embodiment, the actuator includes the feed oil cylinder 6. The load-sensitive multi-way valve 2 includes a first working connection having a first working port and a second working port, the first working port being in communication with the rod cavity of the feed oil cylinder 6, and the second working port being in communication with the rodless cavity of the feed oil cylinder 6 to control the action direction of the feed oil cylinder 6.

[0059] In the embodiment, the full-hydraulic load-sensitive constant power control drilling rig hydraulic system further includes a clamping multi-way valve 8 and a slow drilling reversing valve 9, and the actuator further includes a clamping oil cylinder 7, and the hydraulic pump station 1 further includes a constant pressure pump 103. It should be noted that the clamping oil cylinder 7 is the execution part of the clamp to drive the clamp to clamp the drilling tool.

[0060] The oil inlet of the constant pressure pump 103 is communicated with the oil tank 102, the oil outlet of the constant pressure pump 103 is communicated with the oil inlet of the clamping multi-way valve 8, the clamping multi-way valve 8 has a third working port and a fourth working port, the third working port is communicated with the rodless cavity of the clamping oil cylinder 7, the fourth working port is communicated with the rod cavity of the clamping oil cylinder 7, and the third working port and the fourth working port are used to control the action direction of the clamping oil cylinder 7. In addition, the hydraulic lock 13 is arranged in the control circuit of the clamping oil cylinder 7, the hydraulic lock 13 can seal the oil of the clamping oil cylinder 7, and the clamping oil cylinder 7 can be kept in a static state for a long time.

[0061] The HPCO port (transition connection port) of the clamping multi-way valve 8 is communicated with the oil inlet of the slow drilling reversing valve 9, the oil return ports of the clamping multi-way valve 8 and the slow drilling reversing valve 9 are communicated with the oil tank 102, the slow drilling reversing valve 9 has a fifth working port and a sixth working port, the fifth working port is communicated with the rod cavity of the feeding oil cylinder 6, and the sixth working port is communicated with the rodless cavity of the feeding oil cylinder 6, so as to control the action direction of the feeding oil cylinder 6.

[0062] It should be noted that the clamping multi-way valve 8 and the slow drilling reversing valve 9 can be adjusted in a manual or electric control mode.

[0063] Further, the manual speed regulating valve 23 and the electric proportional speed regulating valve 24 are further included. The parallel connection of the manual speed regulating valve 23 and the electric proportional speed regulating valve 24 is arranged on the pipeline between the sixth working port of the slow drilling reversing valve 9 and the rodless cavity of the feeding oil cylinder 6, and the second working port of the first working connection is communicated with the oil outlet of the manual speed regulating valve 23 and the electric proportional speed regulating valve 24. The purpose of such arrangement is that the drilling hydraulic system of the embodiment has two operation modes of manual and electric control, and can be flexibly switched according to needs. During drilling, the feeding speed of the feeding oil cylinder 6 can be adjusted in real time by adjusting the opening degree of the manual speed regulating valve 23 or the electric proportional speed regulating valve 24, so that the drill bit can always maintain a set speed during drilling, thereby improving the drilling efficiency and stability.

[0064] In the embodiment, the clamping multi-way valve 8 has three working positions:

[0065] When the clamping multi-way valve 8 is switched to the first position, the oil inlet of the clamping multi-way valve 8 is communicated with the third working port of the clamping multi-way valve 8, and the oil return port of the clamping multi-way valve 8 is communicated with the fourth working port of the clamping multi-way valve 8, so that the hydraulic oil enters the rodless cavity of the clamping oil cylinder 7, the piston rod of the clamping oil cylinder 7 is driven to extend, and the drill tool is clamped;

[0066] When the clamping multi-way valve 8 is switched to the second position, the third working port and the fourth working port of the clamping multi-way valve 8 are both communicated with the oil return port of the clamping multi-way valve 8, and the oil inlet of the clamping multi-way valve 8 is communicated with the HPCO port of the clamping multi-way valve 8, so that the hydraulic oil enters the slow drilling reversing valve 9, and the action of the feeding oil cylinder 6 is controlled after being regulated by the slow drilling reversing valve 9.

[0067] When the clamping multi-way valve 8 is switched to the third position, the oil inlet of the clamping multi-way valve 8 is communicated with the fourth working port of the clamping multi-way valve 8, and the oil return port of the clamping multi-way valve 8 is communicated with the third working port of the clamping multi-way valve 8, so that the hydraulic oil enters the rod cavity of the clamping oil cylinder 7, and the piston rod of the clamping oil cylinder 7 is driven to retract, so as to loosen the drilling tool.

[0068] The clamping multi-way valve 8 of the embodiment can interlock the clamp and the slow drilling, ensure the priority of the clamp, and prevent the drill slipping accident. Specifically, the constant pressure pump 103 supplies oil to the clamping multi-way valve 8 and the slow drilling reversing valve 9, and the clamping multi-way valve 8 and the slow drilling reversing valve 9 adopt a series connection form. The HPCO port of the clamping multi-way valve 8 is connected to the oil inlet of the slow drilling reversing valve 9. When the clamping multi-way valve 8 controls the action of the clamping oil cylinder 7, even if the slow drilling reversing valve 9 is misoperated, the pressure oil of the constant pressure pump 103 will not reach the HPCO port of the clamping multi-way valve 8, so the feed oil cylinder 6 will not act. The hydraulic interlocking ensures that the clamp action is given priority, and avoids the drill slipping accident caused by misoperation of the slow drilling valve 9.

[0069] It should be noted that the clamping multi-way valve 8 is a standard multi-way valve group, that is, it can be controlled by electricity or manually.

[0070] Further, the drilling rig hydraulic system of the embodiment further comprises a first reversing valve 10, a first manual proportional pressure reducing overflow valve 11 and a first electric proportional pressure reducing overflow valve 12. The HPCO port of the clamping multi-way valve 8 is communicated with the oil inlets of the first manual proportional pressure reducing overflow valve 11 and the first electric proportional pressure reducing overflow valve 12, the oil outlets of the first manual proportional pressure reducing overflow valve 11 and the first electric proportional pressure reducing overflow valve 12 are communicated with the oil tank 102, the oil outlet of the first manual proportional pressure reducing overflow valve 11 is communicated with the first working oil port of the first reversing valve 10, the oil outlet of the first electric proportional pressure reducing overflow valve 12 is communicated with the second working oil port of the first reversing valve 10, and the third working oil port of the first reversing valve 10 is communicated with the oil inlet of the slow drilling reversing valve 9.

[0071] The purpose of setting the parallel first manual proportional pressure reducing overflow valve 11 and the first electric proportional pressure reducing overflow valve 12 is to make the drilling rig hydraulic system of the embodiment have two operation modes of manual and electric control, which can be flexibly switched as needed, and the pressure of the hydraulic oil at the inlet of the slow drilling reversing valve 9 is adjusted by manual or electric control, thereby realizing the control of the drilling pressure of the feeding cylinder 6 during slow drilling. Direct parallel connection of the first manual proportional pressure reducing overflow valve 11 and the first electric proportional pressure reducing overflow valve 12 will cause the two pressures to affect each other, so the first reversing valve 10 needs to be set at the outlet of the first manual proportional pressure reducing overflow valve 11 and the first electric proportional pressure reducing overflow valve 12: when the first manual proportional pressure reducing overflow valve 11 is operated, the first reversing valve 10 is switched to the first position, and the slow drilling pressure is controlled by the first manual proportional pressure reducing overflow valve 11; when the first electric proportional pressure reducing overflow valve 12 is operated, the first reversing valve 10 is switched to the second position, and the slow drilling pressure is controlled by the first electric proportional pressure reducing overflow valve 12. That is, the first reversing valve 10 can automatically isolate the non-operated pressure reducing overflow valve, avoiding the mutual influence of the two.

[0072] Further, the slow drilling reversing valve 9 comprises a three-position four-way reversing valve 22. The first working oil port of the three-position four-way reversing valve 22 is communicated with the inlet of the slow drilling reversing valve 9, the second working oil port of the three-position four-way reversing valve 22 is communicated with the return port of the slow drilling reversing valve 9, the third working oil port of the three-position four-way reversing valve 22 is communicated with the fifth working port of the slow drilling reversing valve 9, and the fourth working oil port of the three-position four-way reversing valve 22 is communicated with the sixth working port of the slow drilling reversing valve 9.

[0073] When the three-position four-way reversing valve 22 is switched to the first position, the first working oil port and the third working oil port of the three-position four-way reversing valve 22 are communicated, and the second working oil port and the fourth working oil port of the three-position four-way reversing valve 22 are communicated, so that the hydraulic oil enters the rod cavity of the feeding cylinder 6;

[0074] When the three-position four-way reversing valve 22 is switched to the second position, the first working oil port, the second working oil port, the third working oil port and the fourth working oil port of the three-position four-way reversing valve 22 are disconnected with each other, so that the feeding cylinder 6 stops working;

[0075] When the three-position four-way reversing valve 22 is switched to the third position, the first working oil port and the fourth working oil port of the three-position four-way reversing valve 22 are communicated, and the second working oil port and the third working oil port of the three-position four-way reversing valve 22 are communicated, so that the hydraulic oil enters the rodless cavity of the feeding cylinder 6.

[0076] Further, the slow drilling reversing valve 9 further comprises a two-position four-way reversing valve 21 arranged in parallel with the three-position four-way reversing valve 22.

[0077] The first working oil port and the second working oil port of the two-position four-way directional valve 21 are communicated with the oil return port of the slow drilling directional valve 9, the third working oil port of the two-position four-way directional valve 21 is communicated with the fifth working port of the slow drilling directional valve 9, and the fourth working oil port of the two-position four-way directional valve 21 is communicated with the sixth working port of the slow drilling directional valve 9;

[0078] When the two-position four-way directional valve 21 is switched to the first position, the first working oil port, the second working oil port, the third working oil port and the fourth working oil port of the two-position four-way directional valve 21 are disconnected with each other;

[0079] When the two-position four-way directional valve 21 is switched to the second position, the first working oil port and the third working oil port of the two-position four-way directional valve 21 are communicated, and the second working oil port and the fourth working oil port of the two-position four-way directional valve 21 are communicated, so that the rod cavity and the rodless cavity of the feeding cylinder 6 are communicated with the oil tank 102, to realize floating.

[0080] In the embodiment, the actuator further includes a mud pump 5, and the load-sensitive multi-way valve 2 further includes a second working link communicated with the mud pump 5 to control the working of the mud pump 5. It should be noted that in the field of geological exploration, the main function of the mud pump 5 is to press the mud into the space between the drilling tool and the well wall to maintain the stability of the well wall, cool the drill bit, and bring the rock cuttings back to the ground.

[0081] In the embodiment, the actuator further includes a rope winch 4. The load-sensitive multi-way valve 2 further includes a third working link having an eighth working port and a ninth working port, the eighth working port is communicated with the first working oil port of the rope winch 4, and the ninth working port is communicated with the second working oil port of the rope winch 4 to control the rotation direction and rotation speed of the rope winch 4. It should be noted that in the rope coring drilling, the rope winch 4 is used to lower the fishing tool to fish the inner core tube.

[0082] Further, the rope winch 4 is provided with a brake 17, and a shuttle valve 18 is arranged in the control circuit of the rope winch 4, the oil outlet of the shuttle valve 18 is communicated with the brake 17, the shuttle valve 18 can output the hydraulic oil in the control circuit of the rope winch 4 to open the brake 17 to release the brake of the rope winch 4. In addition, the oil outlet of the rope winch 4 is communicated with the oil tank 102 to discharge the hydraulic oil leaked inside the hydraulic motor of the rope winch 4 to prevent the pressure of the winch shell from being too high.

[0083] It should be noted that when the third working connection works to supply oil to the rope winch 4, the two oil inlets of the shuttle valve 18 receive input pressure from two different oil paths respectively, the oil outlet of the shuttle valve 18 outputs the higher pressure of the two oil inlets, and at the same time closes the other one, thereby driving the brake 17 to release the restriction on the rope winch 4, so that the rope winch 4 can normally operate. When the third working connection is not working, the control circuit of the rope winch 4 is connected to the oil tank 102, and the shuttle valve 18 outputs oil pressure of 0, at which time the brake 17 brakes the rope winch 4.

[0084] Further, the control circuit of the rope winch 4 is also provided with a balance valve 19. The balance valve 19 plays a role of load holding and controlling the speed of load descent. On the one hand, when the rope winch 4 needs to keep the heavy object at a certain height, the balance valve 19 prevents the heavy object from sliding down due to gravity by blocking the oil return path of the rope winch 4 and maintaining the system pressure. On the other hand, when the rope winch 4 is lowering the heavy object, the balance valve 19 controls the descent rate by limiting the oil return speed, thereby avoiding uncontrolled acceleration caused by gravity.

[0085] In the present embodiment, the actuator also includes a power head rotary motor 3. The load-sensitive multi-way valve 2 also includes a fourth working connection, which is connected to the power head rotary motor 3 to control the rotation direction and rotation speed of the power head rotary motor 3. It should be noted that the power head rotary motor 3 is used to transmit power to the drill pipe and drill bit to drive the drill bit to break rocks or formations.

[0086] In the present embodiment, the first working connection, the third working connection and the fourth working connection are adjusted in an electric control manner, and the second working connection is adjusted in a hydraulic control manner.

[0087] Specifically, the full-hydraulic load-sensitive constant-power control drilling rig hydraulic system of the present embodiment further includes a second reversing valve 14, a second manual proportional pressure-reducing overflow valve 15 and a second electric proportional pressure-reducing overflow valve 16.

[0088] The P P The oil inlets of the second manual proportional pressure-reducing overflow valve 15 and the second electric proportional pressure-reducing overflow valve 16 are connected to the oil tank 102. It should be noted that the P P The P

[0089] The oil outlet of the second manual proportional pressure-reducing overflow valve 15 is connected to the first working oil port of the second reversing valve 14, and the oil outlet of the second electric proportional pressure-reducing overflow valve 16 is connected to the second working oil port of the second reversing valve 14.

[0090] The second working connection has a control oil port and a seventh working port, the third working oil port of the second reversing valve 14 is communicated with the control oil port of the second working connection, the seventh working port is communicated with the first working oil port of the mud pump 5, and the second working oil port and the oil drain port of the mud pump 5 are communicated with the oil tank 102.

[0091] It should be noted that the P P The pilot oil output by the load-sensitive multi-way valve 2 is supplied to the second manual proportional pressure-reducing overflow valve 15 and the second electric proportional pressure-reducing overflow valve 16 arranged in parallel, wherein the direct parallel arrangement of the second manual proportional pressure-reducing overflow valve 15 and the second electric proportional pressure-reducing overflow valve 16 causes the two pressures to affect each other, and therefore the second reversing valve 14 is arranged at the outlet of the second manual proportional pressure-reducing overflow valve 15 and the second electric proportional pressure-reducing overflow valve 16 to automatically isolate the non-operated pressure-reducing overflow valve and avoid the mutual influence. Specifically, when the second manual proportional pressure-reducing overflow valve 15 is operated, the second reversing valve 14 is switched to the first position to control the pressure of the pilot oil of the second working connection by the second manual proportional pressure-reducing overflow valve 15; when the second electric proportional pressure-reducing overflow valve 16 is operated, the second reversing valve 14 is switched to the second position to control the pressure of the pilot oil of the second working connection by the second electric proportional pressure-reducing overflow valve 16, so that the operation of the mud pump 5 can be realized in two operation modes of manual operation and electric control, which facilitates the operation of workers and improves the work efficiency.

[0092] The power head rotary motor 3 and the mud pump 5 of the embodiment share one hydraulic pump, and the load-sensitive multi-way valve 2 is used to realize proportional distribution of flow according to the valve core opening degree, thereby simplifying the number of hydraulic pumps. Specifically, in the conventional drilling rig system, the power head rotary motor and the mud pump are respectively supplied with oil by two hydraulic pumps without affecting each other. However, in order to simplify components and reduce costs, the drilling rig hydraulic system of the embodiment is supplied with oil by one main pump through the load-sensitive multi-way valve 2 to the power head rotary motor 3 and the mud pump 5. Since the load-sensitive multi-way valve 2 is provided with a flow compensation valve for each connection, and the compensation is performed after the valve, even in the case of unsaturated system flow, the valve group will proportionally distribute the required flow of each valve according to the valve core opening degree of each valve, and the distribution is not affected by the load, thereby ensuring that the power head rotary motor 3 and the mud pump 5 do not affect each other. Moreover, since the speed of the mud pump 5 is adjusted by a hand wheel, the hand wheel has a larger adjustment range and is more in line with the operation habit of the drilling rig workers, so the second working connection of the load-sensitive multi-way valve 2 adopts a hydraulic control form, the pressure of the pilot oil is controlled by the proportional pressure-reducing overflow valve, and the opening degree of the valve core of the main valve of the second working connection is controlled to realize proportional control of the flow of the mud pump 5.

[0093] The drilling rig hydraulic system with full-hydraulic load-sensitive constant-power control provided by the embodiment can realize the following functions:

[0094] First, floating function. When the drill pipe is being connected or disconnected, the two-position four-way valve 21 is switched to the second position, so that the rod cavity and the rodless cavity of the feeding cylinder 6 are both connected to the tank 102, and the power head is floated to protect the drill pipe thread.

[0095] Second, constant pressure drilling function. During drilling, the drilling pressure is adjusted in real time by the first manual proportional pressure reducing overflow valve 11 or the first electric proportional pressure reducing overflow valve 12, so that the drill bit always maintains the set pressure value during drilling, thereby improving drilling efficiency and drill bit life.

[0096] Third, constant speed drilling function. During drilling, the feeding speed of the feeding cylinder 6 is adjusted in real time by adjusting the opening degree of the manual speed regulating valve 23 or the electric proportional speed regulating valve 24, so that the drill bit always maintains the set speed during drilling, thereby improving drilling efficiency and stability.

[0097] Fourth, pressurized drilling function. When the drilling tool gravity is less than the required drilling pressure, the rod cavity pressure of the feeding cylinder 6 is adjusted by the first manual proportional pressure reducing overflow valve 11 or the first electric proportional pressure reducing overflow valve 12, so that additional downward force is applied to the drilling tool to increase the drilling pressure.

[0098] Fifth, pressure reducing drilling function. When the drilling tool gravity is greater than the required drilling pressure, the rodless cavity pressure of the feeding cylinder 6 is adjusted by the pressure reducing overflow valve, so that additional upward force is applied to the drilling tool to reduce the drilling pressure.

[0099] Example 2:

[0100] Referring to Figure 2 , this embodiment provides another full hydraulic load-sensitive constant power control drilling rig hydraulic system. Based on the first embodiment 1, the first reversing valve 10 and the second reversing valve 14 of this embodiment can be two-position four-way reversing valves, two-position three-way reversing valves, or two two-position two-way reversing valves, and the movement of the valve core can be adjusted by liquid control, electric control, or manual form.

[0101] Further, the full hydraulic load-sensitive constant power control drilling rig hydraulic system of this embodiment can be locally provided with a manual operating table to control the above-mentioned manual valves, and remotely provided with an electric control operating table to control the above-mentioned electric control valves.

[0102] The full hydraulic load-sensitive constant power control drilling rig hydraulic system of this embodiment has a manual and electric control operating table, is flexible and maneuverable, and the manual and electric proportional pressure reducing overflow valves are automatically isolated to realize manual and electric control pressure regulation.

[0103] The rest is the same as in the first embodiment, which will not be repeated here.

[0104] In the description of the application, it should be understood that the terms "first", "second" are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0105] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0106] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature, can be the first feature directly above or obliquely above the second feature, or only indicate that the first feature is higher than the second feature in horizontal height. The first feature "below", "under" and "under" the second feature, can be the first feature directly below or obliquely below the second feature, or only indicate that the first feature is lower than the second feature in horizontal height.

[0107] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples, without contradiction.

[0108] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be construed as limiting the present application, and those skilled in the art can modify, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A drilling rig hydraulic system with fully hydraulic load-sensitive constant power control, characterized in that, It includes a hydraulic pump station (1), a load-sensitive multi-way valve (2), and an actuator; The hydraulic pump station (1) includes a load-sensitive constant power pump (101) and an oil tank (102). The oil outlet of the oil tank (102) is connected to the oil inlet of the load-sensitive constant power pump (101). The oil outlet of the load-sensitive constant power 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 LS port of the load-sensitive multi-way valve (2) is connected to the control port of the load-sensitive constant power pump (101). The load-sensitive multi-way valve (2) is connected to the actuator, so that the hydraulic oil output by the hydraulic pump station (1) enters the actuator after being regulated by the load-sensitive multi-way valve (2) to control the action of the actuator. The actuator includes the feed cylinder (6); The load-sensitive multi-way valve (2) includes a first working link, which has a first working port and a second working port. The first working port is connected to the rod chamber of the feed cylinder (6), and the second working port is connected to the rodless chamber of the feed cylinder (6). The drilling rig hydraulic system also includes a clamping multi-way valve (8) and a slow drilling directional valve (9), the actuator also includes a clamping cylinder (7), and the hydraulic pump station (1) also includes a constant pressure pump (103). The oil inlet of the constant pressure pump (103) is connected to the oil tank (102), and the oil outlet of the constant pressure pump (103) is connected to the oil inlet of the clamping multi-way valve (8). The clamping multi-way valve (8) has a third working port and a fourth working port. The third working port is connected to the rodless chamber of the clamping cylinder (7), and the fourth working port is connected to the rod chamber of the clamping cylinder (7). The HPCO port of the clamping multi-way valve (8) is connected to the oil inlet of the slow drilling directional valve (9), and the oil return ports of the clamping multi-way valve (8) and the slow drilling directional valve (9) are connected to the oil tank (102). The slow drilling directional valve (9) has a fifth working port and a sixth working port. The fifth working port is connected to the rod chamber of the feed cylinder (6), and the sixth working port is connected to the rodless chamber of the feed cylinder (6). The clamping multi-way valve (8) has three working positions: When the clamping multi-way valve (8) is switched to the first position, the oil inlet of the clamping multi-way valve (8) is connected to the third working port of the clamping multi-way valve (8), and the oil return port of the clamping multi-way valve (8) is connected to the fourth working port of the clamping multi-way valve (8), so that the hydraulic oil enters the rodless chamber of the clamping cylinder (7) and drives the piston rod of the clamping cylinder (7) to extend and clamp the drill bit. When the clamping multi-way valve (8) is switched to the second position, the third working port and the fourth working port of the clamping multi-way valve (8) are connected to the return port of the clamping multi-way valve (8), and the inlet port of the clamping multi-way valve (8) is connected to the HPCO port of the clamping multi-way valve (8), so that the hydraulic oil enters the slow drilling directional valve (9), and after being regulated by the slow drilling directional valve (9), the action of the feed cylinder (6) is controlled. When the clamping multi-way valve (8) is switched to the third position, the oil inlet of the clamping multi-way valve (8) is connected to the fourth working port of the clamping multi-way valve (8), and the oil return port of the clamping multi-way valve (8) is connected to the third working port of the clamping multi-way valve (8), so that the hydraulic oil enters the rod chamber of the clamping cylinder (7) and drives the piston rod of the clamping cylinder (7) to retract, thereby releasing the drill bit; The LS port is a load-sensitive port, and the HPCO port is a transitional connection port.

2. The drilling rig hydraulic system as described in claim 1, characterized in that: It also includes a manual speed control valve (23) and an electric proportional speed control valve (24); A manual speed control valve (23) and an electric proportional speed control valve (24) are installed in parallel on the pipeline between the sixth working port of the slow drilling reversing valve (9) and the rodless chamber of the feed cylinder (6). The second working port of the first working link is connected to the oil outlet of the manual speed control valve (23) and the electric proportional speed control valve (24).

3. The drilling rig hydraulic system as described in claim 1, characterized in that: The drilling rig hydraulic system also includes a first directional valve (10), a first manual proportional pressure reducing relief valve (11), and a first electric proportional pressure reducing relief valve (12). The HPCO port of the clamping multi-way valve (8) is connected to the oil inlet of the first manual proportional pressure relief valve (11) and the first electric proportional pressure relief valve (12). The oil drain ports of the first manual proportional pressure relief valve (11) and the first electric proportional pressure relief valve (12) are connected to the oil tank (102). The oil outlet of the first manual proportional pressure relief valve (11) is connected to the first working oil port of the first directional valve (10). The oil outlet of the first electric proportional pressure relief valve (12) is connected to the second working oil port of the first directional valve (10). The third working oil port of the first directional valve (10) is connected to the oil inlet of the slow drilling directional valve (9).

4. The drilling rig hydraulic system as described in claim 1, characterized in that: The slow drilling directional valve (9) includes a three-position four-way directional valve (22). The first working port of the three-position four-way directional valve (22) is connected to the inlet port of the slow drilling directional valve (9), the second working port of the three-position four-way directional valve (22) is connected to the return port of the slow drilling directional valve (9), the third working port of the three-position four-way directional valve (22) is connected to the fifth working port of the slow drilling directional valve (9), and the fourth working port of the three-position four-way directional valve (22) is connected to the sixth working port of the slow drilling directional valve (9). When the three-position four-way directional valve (22) is switched to the first position, the first working port of the three-position four-way directional valve (22) is connected to the third working port, and the second working port of the three-position four-way directional valve (22) is connected to the fourth working port, so that the hydraulic oil enters the rod chamber of the feed cylinder (6); When the three-position four-way directional valve (22) is switched to the second position, the first working port, the second working port, the third working port and the fourth working port of the three-position four-way directional valve (22) are disconnected from each other, so that the feed cylinder (6) stops operating. When the three-position four-way directional valve (22) is switched to the third position, the first working port of the three-position four-way directional valve (22) is connected to the fourth working port, and the second working port of the three-position four-way directional valve (22) is connected to the third working port, so that the hydraulic oil enters the rodless chamber of the feed cylinder (6).

5. The drilling rig hydraulic system as described in claim 4, characterized in that: The slow drilling directional valve (9) also includes a two-position four-way directional valve (21) connected in parallel with the three-position four-way directional valve (22). The first and second working ports of the two-position four-way directional valve (21) are connected to the return port of the slow drilling directional valve (9), the third working port of the two-position four-way directional valve (21) is connected to the fifth working port of the slow drilling directional valve (9), and the fourth working port of the two-position four-way directional valve (21) is connected to the sixth working port of the slow drilling directional valve (9). When the two-position four-way directional valve (21) is switched to the first position, the first working port, the second working port, the third working port and the fourth working port of the two-position four-way directional valve (21) are disconnected from each other; When the two-position four-way directional valve (21) is switched to the second position, the first working port of the two-position four-way directional valve (21) is connected to the third working port, and the second working port of the two-position four-way directional valve (21) is connected to the fourth working port, so that the rod chamber and the rodless chamber of the feed cylinder (6) are connected to the oil tank (102) to achieve floating.

6. The drilling rig hydraulic system as described in claim 1, characterized in that: The actuators also include a mud pump (5), a rope winch (4), and a power head rotary motor (3). The load-sensitive multi-way valve (2) also includes a second working link, a third working link and a fourth working link. The second working link is connected to the mud pump (5), the third working link is connected to the rope winch (4), and the fourth working link is connected to the power head rotary motor (3).

7. The drilling rig hydraulic system as described in claim 6, characterized in that: The drilling rig hydraulic system also includes a second directional valve (14), a second manual proportional pressure reducing relief valve (15), and a second electric proportional pressure reducing relief valve (16). P of the load-sensitive multi-way valve (2) P The ports are respectively connected to the inlets of the second manual proportional pressure reducing relief valve (15) and the second electric proportional pressure reducing relief valve (16), and the drain ports of the second manual proportional pressure reducing relief valve (15) and the second electric proportional pressure reducing relief valve (16) are connected to the oil tank (102). P The port is the pilot oil source port inside the load-sensitive multi-way valve (2); The oil outlet of the second manual proportional pressure reducing relief valve (15) is connected to the first working oil port of the second reversing valve (14), and the oil outlet of the second electric proportional pressure reducing relief valve (16) is connected to the second working oil port of the second reversing valve (14). The second working link has a control port and a seventh working port. The third working port of the second reversing valve (14) is connected to the control port of the second working link. The seventh working port is connected to the first working port of the mud pump (5). The second working port of the mud pump (5) is connected to the oil tank (102).

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