A hydraulic control system for a drilling rig and a rescue drilling rig

Abstract

The present invention discloses a hydraulic control system for a drilling rig and a rescue drilling rig, which relates to the technical field of hydraulics. The hydraulic control system for the drilling rig includes: a propulsion cylinder; a slewing motor; a fast-push oil circuit that supplies hydraulic oil to the propulsion cylinder; a working-push oil circuit that supplies hydraulic oil to the propulsion cylinder; a slewing oil circuit connected to the slewing motor; a power assembly that extracts hydraulic oil from an oil tank to the slewing oil circuit, the working-push oil circuit, and the fast-push oil circuit; and a first hydraulic control directional valve. During the operation of the hydraulic control system for the drilling rig of the present invention, in the fast-push working condition, the slewing oil circuit is locked by the first hydraulic control directional valve to avoid misoperation of slewing during fast-pushing, which can effectively avoid potential safety hazards when fast-pushing and slewing are carried out simultaneously, and improve the safety during the operation process.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulics, and more specifically, to a hydraulic control system for a drilling rig. In addition, the present invention also relates to a rescue drilling rig including the above-mentioned hydraulic control system for a drilling rig. Background Art

[0002] The large-diameter rescue drilling rig can form holes quickly and safely, and at the same time can avoid secondary cave-ins. The propulsion cylinder of the large-diameter rescue drilling rig uses a large cylinder diameter, and there is a large difference in the flow rates between the working push and the fast push.

[0003] In the prior art, the working states of the large-diameter rescue drilling rig include rotation, fast push, and working feed and working retraction. During the specific use process, in order to ensure the fast push speed and the safety during the operation process, the rotation action needs to be avoided during the fast push. If the relevant valve body is manually controlled to avoid the simultaneous occurrence of fast push and rotation, it will be affected by the operation proficiency and fatigue degree, and it is easy to have misoperations, affecting the drilling rig efficiency.

[0004] In summary, how to improve the safety of the hydraulic control system for a drilling rig is an urgent problem to be solved by those skilled in the art at present. Summary of the Invention

[0005] In view of this, an object of the present invention is to provide a hydraulic control system for a drilling rig, which can ensure that the drilling rig will not rotate during the fast push condition during the use process, avoid the simultaneous operation of fast push and rotation, and improve the safety of the hydraulic control system for a drilling rig.

[0006] Another object of the present invention is to provide a rescue drilling rig including the above-mentioned hydraulic control system for a drilling rig.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A hydraulic control system for a drilling rig, comprising:

[0009] A propulsion cylinder;

[0010] A rotary motor;

[0011] A fast push oil circuit, connected to the propulsion cylinder, providing hydraulic oil for the propulsion cylinder to make the propulsion cylinder fast forward or fast backward;

[0012] A working push oil circuit, connected to the propulsion cylinder, providing hydraulic oil for the propulsion cylinder to make the propulsion cylinder work forward or work backward;

[0013] A rotation oil circuit, connected to the rotary motor, providing hydraulic oil for the rotary motor to make the rotary motor rotate;

[0014] The power assembly is connected to the slewing oil circuit, the working pushing oil circuit, and the quick pushing oil circuit, and draws hydraulic oil from the fuel tank to the slewing oil circuit, the working pushing oil circuit, and the quick pushing oil circuit.

[0015] The first hydraulic control directional valve has an inlet connected to the power assembly and outlets connected to the quick pushing oil circuit and the slewing oil circuit; and at most only one of the quick pushing oil circuit and the slewing oil circuit can obtain hydraulic oil from the fuel tank at the same time.

[0016] Optionally, the quick pushing oil circuit includes a second hydraulic control directional valve and a first directional valve connected to the second hydraulic control directional valve. The first directional valve is connected to the outlet of the power assembly, and the second hydraulic control directional valve is connected to the first hydraulic control directional valve.

[0017] The second hydraulic control directional valve is connected to the propulsion cylinder and is used to control the switching of the propulsion cylinder between quick pushing and quick advancing. The first directional valve is used to control the commutation of the second hydraulic control directional valve.

[0018] Optionally, the slewing oil circuit includes a third hydraulic control directional valve and a second directional valve connected to the third hydraulic control directional valve. The second directional valve is connected to the outlet of the power assembly, and the third hydraulic control directional valve is connected to the first hydraulic control directional valve.

[0019] The third hydraulic control directional valve is connected to the slewing motor and is used to control the slewing motor to switch the rotation direction. The second directional valve is used to control the commutation of the third hydraulic control directional valve.

[0020] Optionally, a speed control valve is provided between the third hydraulic control directional valve and the first hydraulic control directional valve.

[0021] Optionally, a first check valve is provided between the outlet of the power assembly and the first hydraulic control directional valve.

[0022] Optionally, the working pushing oil circuit includes a third directional valve. The inlet of the third directional valve is connected to the power assembly, and the outlet of the third directional valve is connected to the propulsion cylinder.

[0023] Optionally, an overflow pressure reducing valve and a second check valve connected in parallel with the overflow pressure reducing valve are provided between the third directional valve and the propulsion cylinder. The inlet of the second check valve is connected to the rodless cavity of the propulsion cylinder, and the outlet of the second check valve is connected to the third directional valve.

[0024] Optionally, the first directional valve, the second directional valve, and the third directional valve are integrally provided on the same operating console.

[0025] Optionally, the power assembly includes a first oil pump and a second oil pump. The oil outlet of the first oil pump is connected to the first hydraulic control directional valve, and the oil outlet of the second oil pump is connected to the working propulsion oil circuit.

[0026] A rescue drill includes the drill hydraulic control system described in any one of the above.

[0027] During the use of the drill hydraulic control system provided by the present invention, in the fast propulsion condition, control the power assembly to supply oil to the first hydraulic control directional valve, and make the hydraulic oil flowing out of the first hydraulic control directional valve enter the fast propulsion oil circuit to control the fast retraction or fast advancement of the propulsion cylinder; in the slewing condition, control the power assembly to supply oil to the first hydraulic control directional valve, and make the hydraulic oil flowing out of the first hydraulic control directional valve enter the slewing oil circuit to control the forward or reverse slewing of the slewing motor; in the working propulsion condition, control the power assembly to supply oil to the working propulsion oil circuit to control the slewing of the slewing motor.

[0028] Compared with the prior art, during the operation of the drill hydraulic control system in the present invention, in the fast propulsion condition, the slewing oil circuit is locked by the first hydraulic control directional valve to avoid the simultaneous occurrence of fast propulsion and slewing, effectively avoiding potential safety hazards when fast propulsion and slewing occur simultaneously, and improving the safety during the operation process.

[0029] In addition, the present invention also provides a rescue drill including the above drill hydraulic control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0031] Figure 1 It is a schematic structural diagram of a specific embodiment of the drill hydraulic control system provided by the present invention;

[0032] Figure 2 It is a logic control diagram of a specific embodiment of the drill hydraulic control system provided by the present invention.

[0033] Figure 1-2 In which:

[0034] 1 is the first oil pump, 2 is the second oil pump, 3 is the third overflow valve, 4 is the second overflow valve, 5 is the first check valve, 6 is the third check valve, 7 is the first overflow valve, 8 is the third reversing valve, 9 is the first reversing valve, 10 is the second reversing valve, 11 is the fourth overflow valve, 12 is the first pilot-operated reversing valve, 13 is the throttle valve, 14 is the third pilot-operated reversing valve, 15 is the second pilot-operated reversing valve, 16 is the second check valve, 17 is the overflow pressure reducing valve, 18 is the slewing motor, 19 is the propulsion cylinder. Detailed implementation mode

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0036] The core of the present invention is to provide a hydraulic control system for a drilling rig, which can ensure that only one of the fast-pushing working condition and the slewing working condition is turned on during use, avoid the simultaneous operation of fast-pushing and slewing, and improve the safety of the hydraulic control system of the drilling rig.

[0037] Another core of the present invention is to provide a rescue drilling rig including the above-mentioned hydraulic control system for a drilling rig.

[0038] Please refer to Figure 1 and Figure 2 。

[0039] This specific embodiment discloses a hydraulic control system for a drilling rig, including: a propulsion cylinder 19; a slewing motor 18; a fast-pushing oil circuit connected to the propulsion cylinder 19 to provide hydraulic oil for the propulsion cylinder 19 to make the propulsion cylinder 19 advance or retreat quickly; a working-pushing oil circuit connected to the propulsion cylinder 19 to provide hydraulic oil for the propulsion cylinder 19 to make the propulsion cylinder 19 advance or retreat during normal operation; a slewing oil circuit connected to the slewing motor 18 to provide hydraulic oil for the slewing motor 18 to make the slewing motor 18 slew; a power assembly connected to the slewing oil circuit, the working-pushing oil circuit, and the fast-pushing oil circuit, and extracting hydraulic oil from the fuel tank to the slewing oil circuit, the working-pushing oil circuit, and the fast-pushing oil circuit; a first pilot-operated reversing valve 12, with an oil inlet connected to the power assembly and an oil outlet connected to the fast-pushing oil circuit and the slewing oil circuit; and at most only one of the fast-pushing oil circuit and the slewing oil circuit can obtain hydraulic oil from the fuel tank at the same time.

[0040] Specifically, as Figure 1As shown, when the first hydraulic control reversing valve 12 is in the parallel position, the oil outlet of the first hydraulic control reversing valve 12 is connected to the slewing oil circuit, and only the slewing motor 18 can be controlled to slewing; when the first hydraulic control reversing valve 12 is in the crossover position, the oil outlet of the first hydraulic control reversing valve 12 is connected to the fast push oil circuit, and only the propulsion cylinder 19 can be controlled to retract or extend quickly.

[0041] During the use of the drilling rig hydraulic control system provided by this specific embodiment, in the fast push working condition, the power assembly is controlled to supply oil to the first hydraulic control reversing valve 12, and the hydraulic oil flowing out of the first hydraulic control reversing valve 12 enters the fast push oil circuit to control the propulsion cylinder 19 to retract or extend quickly; in the slewing working condition, the power assembly is controlled to supply oil to the first hydraulic control reversing valve 12, and the hydraulic oil flowing out of the first hydraulic control reversing valve 12 enters the slewing oil circuit to control the slewing motor 18 to rotate forward or backward; in the working push working condition, the power assembly is controlled to supply oil to the working push oil circuit to control the slewing motor 18 to slewing.

[0042] Compared with the prior art, during the operation of the drilling rig hydraulic control system in this specific embodiment, in the fast push working condition, the slewing oil circuit is locked by the first hydraulic control reversing valve 12, avoiding the simultaneous fast push and slewing, effectively avoiding potential safety hazards during the simultaneous fast push and slewing, and improving the safety during the operation process.

[0043] As Figure 1 shown, in a specific embodiment, the fast push oil circuit includes a second hydraulic control reversing valve 15 and a first reversing valve 9 connected to the second hydraulic control reversing valve 15. The first reversing valve 9 is connected to the oil outlet of the power assembly, and the second hydraulic control reversing valve 15 is connected to the first hydraulic control reversing valve 12; the second hydraulic control reversing valve 15 is connected to the propulsion cylinder 19 and is used to control the switching of the propulsion cylinder 19 between fast push and fast forward, and the first reversing valve 9 is used to control the reversing of the second hydraulic control reversing valve 15.

[0044] As Figure 1 shown, when the first reversing valve 9 is in the neutral position, the hydraulic oil pumped out by the first oil pump 1 is blocked by the first reversing valve 9 after passing through the first check valve 5 and cannot enter the fast push oil circuit; when the first reversing valve 9 is in the parallel position, the pilot oil flowing out of the first reversing valve 9 acts on the first hydraulic control reversing valve 12 and at the same time acts on the right side of the second hydraulic control reversing valve 15. The hydraulic oil flows through the first oil pump 1, the first check valve 5, the first hydraulic control reversing valve 12, the second hydraulic control reversing valve 15, and the rodless cavity of the propulsion cylinder 19 in sequence, causing the piston rod of the propulsion cylinder 19 to extend and realizing the fast forward operation; operating the first reversing valve 9 to the crossover position, the pilot oil flowing out of the first reversing valve 9 acts on the first hydraulic control reversing valve 12 and at the same time acts on the left side of the second hydraulic control reversing valve 15. The hydraulic oil flows through the first oil pump 1, the first check valve 5, the first hydraulic control reversing valve 12, the second hydraulic control reversing valve 15, and the rod cavity of the propulsion cylinder 19 in sequence, causing the piston rod of the propulsion cylinder 19 to retract and realizing the fast retraction operation.

[0045] Figure 1 The setting of the first one-way valve 5 can prevent the hydraulic oil from flowing back to the first oil pump 1. At the same time, a third overflow valve 3 is provided at the oil outlet of the first oil pump 1, which can effectively prevent the pressure at the oil outlet of the first oil pump 1 from being too high and ensure that the pressure at the oil outlet of the first oil pump 1 meets the requirements.

[0046] In a specific embodiment, the slewing oil circuit includes a third pilot-operated directional valve 14 and a second directional valve 10 connected to the third pilot-operated directional valve 14. The second directional valve 10 is connected to the oil outlet of the power assembly, and the third pilot-operated directional valve 14 is connected to the first pilot-operated directional valve 12; the third pilot-operated directional valve 14 is connected to the slewing motor 18 and is used to control the slewing motor 18 to switch the rotation direction, and the second directional valve 10 is used to control the third pilot-operated directional valve 14 to change the direction.

[0047] A speed control valve 13 is provided between the third pilot-operated directional valve 14 and the first pilot-operated directional valve 12. The setting of the speed control valve 13 can control the flow rate of the hydraulic oil flowing into the third pilot-operated directional valve 14 and can be used to adjust the rotational speed of the slewing motor 18.

[0048] During the specific use process, operate the second directional valve 10 to the parallel position to make the pilot oil act on the left side of the third pilot-operated directional valve 14. The hydraulic oil of the first oil pump 1 flows through the first one-way valve 5, the first pilot-operated directional valve 12, the speed control valve 13, the third pilot-operated directional valve 14, and the slewing motor 18 in sequence to realize the clockwise rotation of the slewing motor 18; operate the second directional valve 10 to the cross position to make the pilot oil act on the right side of the third pilot-operated directional valve 14. The hydraulic oil of the first oil pump 1 flows through the first one-way valve 5, the first pilot-operated directional valve 12, the speed control valve 13, the third pilot-operated directional valve 14, and the slewing motor 18 in sequence to realize the counterclockwise rotation of the slewing motor 18.

[0049] As Figure 1 shown, it further includes a fourth overflow valve 11. By adjusting the fourth overflow valve 11, the load feedback pressure can be remotely restricted to achieve two-way slewing pressure control.

[0050] In a specific embodiment, the work pushing oil circuit includes a third directional valve 8. The oil inlet of the third directional valve 8 is connected to the power assembly, and the oil outlet of the third directional valve 8 is connected to the pushing cylinder 19.

[0051] An overflow type pressure reducing valve 17 and a second one-way valve 16 connected in parallel with the overflow type pressure reducing valve 17 are provided between the third directional valve 8 and the pushing cylinder 19. The oil inlet of the second one-way valve 16 is connected to the rodless cavity of the pushing cylinder 19, and the oil outlet of the second one-way valve 16 is connected to the third directional valve 8.

[0052] During the specific operation process, operate the third hydraulic control reversing valve 14 to the parallel position. The pressure oil of the second oil pump 2 flows through the third check valve 6, the third hydraulic control reversing valve 14, and the overflow type pressure reducing valve 17 in sequence and acts on the rodless cavity of the propulsion cylinder 19 to realize the working feed operation. Operate the third hydraulic control reversing valve 14 to the crossover position. The pressure oil of the second oil pump 2 flows through the third check valve 6 and the third hydraulic control reversing valve 14 in sequence and acts on the rod end cavity of the propulsion cylinder 19 to realize the forward pushing operation. The hydraulic oil in the rodless cavity of the propulsion cylinder 19 flows back to the fuel tank through the second check valve 16 and the third hydraulic control reversing valve 14.

[0053] As shown in the figure, a first relief valve 7 is provided. By adjusting the relief valve, the pressure of the overflow type pressure reducing valve 17 can be remotely controlled to realize the propulsion pressure control.

[0054] A second relief valve 4 is provided between the oil outlet of the second oil pump 2 and the third check valve 6, which can effectively prevent the pressure at the oil outlet of the second oil pump 2 from being too high and ensure that the pressure at the oil outlet of the second oil pump 2 meets the requirements.

[0055] In a specific embodiment, the power assembly includes a first oil pump 1 and a second oil pump 2. The oil outlet of the first oil pump 1 is connected to the first hydraulic control reversing valve 12, and the oil outlet of the second oil pump 2 is connected to the forward pushing oil circuit. In Figure 1 the shown specific embodiment, due to the large difference in flow rate between the forward pushing oil circuit and the fast forward pushing oil circuit, two different specifications of flow valves are used for the forward pushing oil circuit and the fast forward pushing oil circuit, and different oil pumps are used to enable both the forward pushing and fast forward pushing working conditions to proceed stably.

[0056] For convenient operation, the first reversing valve 9, the second reversing valve 10, and the third reversing valve 8 can be integrally arranged on the same operating table; or the first reversing valve 9, the second reversing valve 10, the third reversing valve 8, the first relief valve 7, and the fourth relief valve 11 can be integrated on the same workbench, which is convenient for on-site layout, simple to operate, and has a low system cost.

[0057] Such as Figure 2As shown, when the third reversing valve 8 is not in the neutral position, the first reversing valve 9 is in the neutral position, and the second reversing valve 10 is not in the neutral position, the drilling rig hydraulic control system is in the working feed rotation or working return rotation state at this time; when the third reversing valve 8 is in the neutral position and the first reversing valve 9 is not in the neutral position, the drilling rig hydraulic control system is in the fast forward or fast reverse state at this time; when the third reversing valve 8 is in the neutral position and the first reversing valve 9 is in the neutral position, the drilling rig hydraulic control system is in the stop state at this time; when the third reversing valve 8 is not in the neutral position and the first reversing valve 9 is not in the neutral position, if the function positions of the first reversing valve 9 and the third reversing valve are the same, both in the parallel position or both in the cross position, the drilling rig hydraulic control system is in the fast forward or fast reverse state at this time, and if the function positions of the first reversing valve 9 and the third reversing valve are different, the drilling rig hydraulic control system is in the stop state; if the second reversing valve 10 is in the neutral position, the drilling rig hydraulic control system is in the stop rotation state.

[0058] In addition to the above drilling rig hydraulic control system, the present invention also provides a rescue drilling rig including the drilling rig hydraulic control system disclosed in the above embodiment. For the structures of other parts of the rescue drilling rig, reference may be made to the prior art and will not be elaborated herein.

[0059] The "first", "second", "third", and "fourth" in the first oil pump 1, second oil pump 2, first overflow valve 7, second overflow valve 4, third overflow valve 3, and fourth overflow valve 11, first reversing valve 9, second reversing valve 10, and third reversing valve 8, first hydraulic control reversing valve 12, second hydraulic control reversing valve 15, and third hydraulic control reversing valve 14, first check valve 5, second check valve 16, and third check valve 6 mentioned in this application document are only used to distinguish different positions and do not have a sequence order.

[0060] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. Any combination of all the embodiments provided by the present invention is within the protection scope of this invention and will not be elaborated herein.

[0061] The above has introduced the drilling rig hydraulic control system and the rescue drilling rig provided by the present invention in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A hydraulic control system for a drilling rig, characterized in that, Comprising: A propulsion oil cylinder (19); A slewing motor (18); A fast-push oil circuit, connected to the propulsion oil cylinder (19), providing hydraulic oil to the propulsion oil cylinder (19) to enable the propulsion oil cylinder (19) to fast forward or fast reverse; A working-push oil circuit, connected to the propulsion oil cylinder (19), providing hydraulic oil to the propulsion oil cylinder (19) to enable the propulsion oil cylinder (19) to work forward or work reverse; A slewing oil circuit, connected to the slewing motor (18), providing hydraulic oil to the slewing motor (18) to enable the slewing motor (18) to slew; A power assembly, connected to the slewing oil circuit, the working-push oil circuit, and the fast-push oil circuit, and extracting hydraulic oil from the fuel tank to the slewing oil circuit, the working-push oil circuit, and the fast-push oil circuit; A first hydraulic control reversing valve (12), with its inlet connected to the power assembly and its outlet connected to the fast-push oil circuit and the slewing oil circuit; and at the same time, at most only one of the fast-push oil circuit and the slewing oil circuit can obtain hydraulic oil from the fuel tank; The fast-push oil circuit includes a second hydraulic control reversing valve (15) and a first reversing valve (9) connected to two pilot oil ports of the second hydraulic control reversing valve (15). The first reversing valve (9) is connected to the outlet of the power assembly, and the high-pressure inlet of the second hydraulic control reversing valve (15) is connected to the second high-pressure outlet of the first hydraulic control reversing valve (12); The second hydraulic control reversing valve (15) is connected to the propulsion oil cylinder (19) and is used to control the switching of the propulsion oil cylinder (19) between fast reverse and fast forward. The first reversing valve (9) is used to control the reversing of the second hydraulic control reversing valve (15); The slewing oil circuit includes a third hydraulic control reversing valve (14) and a second reversing valve (10) connected to two pilot oil ports of the third hydraulic control reversing valve (14). The second reversing valve (10) is connected to the outlet of the power assembly, and the high-pressure inlet of the third hydraulic control reversing valve (14) is connected to the first high-pressure outlet of the first hydraulic control reversing valve (12); The third hydraulic control reversing valve (14) is connected to the slewing motor (18) and is used to control the switching of the slewing direction of the slewing motor (18). The second reversing valve (10) is used to control the reversing of the third hydraulic control reversing valve (14).

2. The hydraulic control system of the drilling rig according to claim 1, characterized in that A speed control valve (13) is provided between the third hydraulic control reversing valve (14) and the first hydraulic control reversing valve (12).

3. The hydraulic control system of the drill rig according to claim 1, characterized in that, A first check valve (5) is provided between the outlet of the power assembly and the first hydraulic control reversing valve (12).

4. The hydraulic control system of the drilling rig according to any one of claims 1-3, characterized in that The working-push oil circuit includes a third reversing valve (8). The inlet of the third reversing valve (8) is connected to the power assembly, and the outlet of the third reversing valve (8) is connected to the propulsion oil cylinder (19).

5. The hydraulic control system of the drill rig according to claim 4, wherein An overflow pressure reducing valve (17) and a second check valve (16) connected in parallel with the overflow pressure reducing valve (17) are provided between the third reversing valve (8) and the propulsion oil cylinder (19). An oil inlet of the second check valve (16) is connected to a rodless cavity of the propulsion oil cylinder (19), and an oil outlet of the second check valve (16) is connected to the third reversing valve (8).

6. The hydraulic control system of the drilling rig according to claim 4, characterized in that, The first reversing valve (9), the second reversing valve (10) and the third reversing valve (8) are integrally arranged on the same operating table.

7. The hydraulic control system of a drilling rig according to any one of claims 1-3, characterized in that, The power assembly includes a first oil pump (1) and a second oil pump (2). An oil outlet of the first oil pump (1) is connected to the first hydraulically controlled reversing valve (12), and an oil outlet of the second oil pump (2) is connected to the working propulsion oil circuit.

8. A rescue drill, characterized in that, It includes the drilling rig hydraulic control system according to any one of claims 1-7.

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