Hydraulic system of drilling rig and drilling rig

Abstract

The present invention provides a hydraulic system of a drilling rig and the drilling rig, comprising an electric motor, a first hydraulic pump, a second hydraulic pump, a drilling system, a walking system, a posture adjustment system, a pump-motor control valve group and a conversion valve; the oil outlet of the first hydraulic pump is connected with the oil inlet of the posture adjustment system and the oil inlet of the drilling system; the oil outlet of the second hydraulic pump is connected with the oil inlet of the walking system and the drilling system; the feedback oil port of the second hydraulic pump is connected with the feedback oil port of the walking system, the external feedback oil port of the walking system and the feedback oil port of the drilling system in sequence; the pump-motor control valve group is respectively connected with the conversion valve, the drilling system, the walking system and the posture adjustment system; the pump-motor control valve group is used for adjusting the oil inlet pressure of the drilling system, the walking system and the posture adjustment system; the conversion valve is used for controlling the working state of the drilling system, the walking system and the posture adjustment system; it can be achieved that when the drilling system is working, the walking system and the posture adjustment system are not working, so as to prevent accidents caused by misoperation.

Description

Technical Field

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

[0002] Hydraulic drilling rigs are widely used production equipment in coal mine gas extraction operations. The hydraulic system of the drilling rig uses a hydraulic pump to convert mechanical energy into liquid pressure energy, and converts the liquid pressure energy into mechanical energy through various control valves, pipelines and hydraulic components to drive the working mechanism to achieve linear reciprocating motion or rotary motion; the design of the hydraulic system of the drilling rig plays a decisive role in the overall performance of the hydraulic drilling rig.

[0003] In the existing design, the drilling rig includes a walking system, a drilling system and a posture adjustment system. When the drilling system is working, if the operator makes an error in operation so that the walking system and / or the posture adjustment system also operate at the same time as the drilling system, this is a very dangerous situation and is prone to safety accidents. Summary of the invention

[0004] The purpose of the present invention is to provide a hydraulic system and a drilling rig for a drilling rig, aiming to solve the problem in the prior art that when the drilling system of the drilling rig is working, if the operator makes an error in operation so that the walking system and / or the posture adjustment system also operate simultaneously with the drilling system, this is a very dangerous situation and is prone to safety accidents.

[0005] In order to solve the above technical problems, the present invention provides a hydraulic system for a drilling rig, comprising:

[0006] An electric motor (1), a first hydraulic pump (2), a second hydraulic pump (3), a drilling system, a walking system, a posture adjustment system, a pump motor control valve group (8) and a conversion valve (9);

[0007] The oil outlet of the first hydraulic pump (2) is connected to the oil inlet (P″′) of the posture adjustment system and the oil inlet (P2) of the drilling system;

[0008] The oil outlet (B) of the second hydraulic pump (3) is connected to the oil inlet (P1) of the traveling system and the drilling system; the feedback oil port (X) of the second hydraulic pump (3) is connected in sequence to the feedback oil port (LS2) of the traveling system, the external feedback oil port (LS1) of the traveling system, and the feedback oil port (LS) of the drilling system;

[0009] The pump motor control valve group (8) is respectively connected to the conversion valve (9), the drilling system, the walking system, and the posture adjustment system;

[0010] The pump motor control valve group (8) is used to adjust the oil inlet pressure of the drilling system, the walking system and the posture adjustment system;

[0011] The conversion valve (9) is used to control the working states of the drilling system, the walking system and the posture adjustment system.

[0012] Optionally, the drilling system comprises a drilling multi-way valve group (12), and a drilling pilot valve (6) and a drilling actuator respectively connected to the drilling multi-way valve group (12); the drilling pilot valve (6) controls the operation of the drilling multi-way valve group (12), thereby controlling the operation of the drilling actuator;

[0013] The walking system comprises a walking multi-way valve group (10), and a walking pilot valve (7) and a walking actuator respectively connected to the walking multi-way valve group (10); the walking pilot valve (7) controls the operation of the walking multi-way valve group (10), thereby controlling the operation of the walking actuator;

[0014] The attitude adjustment system comprises an attitude adjustment multi-way valve group (11), and an attitude adjustment pilot valve (5) and an attitude adjustment actuator respectively connected to the attitude adjustment multi-way valve group (11); the attitude adjustment pilot valve (5) controls the operation of the attitude adjustment multi-way valve group (11), thereby controlling the operation of the attitude adjustment actuator.

[0015] Optionally, the drilling multi-way valve group (12) includes six control oil ports (z1, z2, z3, y1, y2, y3); the oil port of the drilling pilot valve (6) includes six working oil ports (a1, a2, a3, b1, b2, b3); the drilling multi-way valve group (12) includes a first hydraulically controlled reversing valve (121), a second hydraulically controlled reversing valve (122), and a third hydraulically controlled reversing valve (123); the six control oil ports (z1, z2, z3, y1, y2, y3) respectively serve as control oil ports of the first hydraulically controlled reversing valve (121), the second hydraulically controlled reversing valve (122), and the third hydraulically controlled reversing valve (123); the six control oil ports (z1, z2, z3, y1, y2, y3) are respectively connected to the six working oil ports (a1, a2, a3, b1, b2, b3);

[0016] The travel multi-way valve group (10) comprises four control oil ports (x1, x2, w1, w2); the oil port of the travel pilot valve (7) comprises four working oil ports (Xa1, Xa2, Xb1, Xb2); the travel multi-way valve group (10) comprises two fourth hydraulically controlled reversing valves (102); the four control oil ports (x1, x2, w1, w2) respectively serve as the control oil ports of the two fourth hydraulically controlled reversing valves (102); the four control oil ports (x1, x2, w1, w2) are respectively connected to the four working oil ports (Xa1, Xa2, Xb1, Xb2);

[0017] The attitude adjustment multi-way valve group (11) comprises twenty control oil ports (v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, u1, u2, u3, u4, u5, u6, u7, u8, u9, u10); the oil ports of the attitude adjustment pilot valve (5) comprise twenty working oil ports (Ta1, Ta2, Ta3, Ta4, Ta5, Ta6, Ta7, Ta8, Ta9, Ta10, Tb1, Tb2, Tb3, Tb4, Tb5, Tb6, Tb7, Tb8, Tb9, Tb10); the attitude adjustment multi-way valve group (11) comprises ten fifth hydraulically controlled reversing valves (112); the twenty control oil ports (v1, v2, v3, v4, v5 , v6, v7, v8, v9, v10, u1, u2, u3, u4, u5, u6, u7, u8, u9, u10) are respectively used as the control oil ports of the ten fifth hydraulically controlled reversing valves (112); the twenty control oil ports (v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, u1, u2, u3, u4, u5, u6, u7, u8, u9, u10) are respectively connected to the twenty working oil ports (Ta1, Ta2, Ta3, Ta4, Ta5, Ta6, Ta7, Ta8, Ta9, Ta10, Tb1, Tb2, Tb3, Tb4, Tb5, Tb6, Tb7, Tb8, Tb9, Tb10).

[0018] Optionally, the drilling actuator comprises a hydraulic motor (23), a feed cylinder (24), an anti-drilling valve group (13), a clamp (25) and a chuck (26); and / or the walking actuator comprises a left walking motor (27) and a right walking motor (28); and / or the posture adjustment actuator comprises a front upper support device (14), a lifting device (15), an upper rotating device (16), a lower rotating device (17), a rear upper support device (18), a left front lower support device (19), a right front lower support device (20), a left rear lower support device (21), a right rear lower support device (22) and a runway compensation device (27).

[0019] Optionally, the pump-motor control valve group (8) includes a first pressure regulating valve (81), a second pressure regulating valve (82) and a throttle valve (83); the oil inlet (P) of the pump-motor control valve group (8) is connected to the drilling actuator after passing through the first pressure regulating valve (81) and the throttle valve (83); the oil inlet (P) of the pump-motor control valve group (8) is connected to the oil inlet (P9) of the conversion valve (9), the drilling pilot valve (6), the walking pilot valve (7), and the posture adjustment pilot valve (5) respectively through the second pressure regulating valve (82).

[0020] Optionally, the oil ports of the conversion valve (9) include an oil inlet (P9), an oil return port (T), and two working oil ports (a0, b0); the posture adjustment multi-way valve group (11) includes a second combination valve group (111), the second combination valve group (111) includes a control oil port (S0), and the control oil port (S0) is connected to the working oil port (a0); the travel multi-way valve group (10) includes a first combination valve group (101), the first combination valve group (101) includes a control oil port (S1), and the control oil port (S1) is connected to the working oil port (b0);

[0021] When the conversion valve (9) is in the front position, the oil inlet (P9) is connected to the oil return port (T), and the two working oil ports (a0, b0) are connected to the oil return port (T);

[0022] When the conversion valve (9) is in the middle position, the oil inlet (P9) is disconnected, and the two working oil ports (a0, b0) are connected to the oil return port (T);

[0023] When the conversion valve (9) is in the rear position, the oil inlet (P9) is connected to the two working oil ports (a0, b0).

[0024] Optionally, the conversion valve (9) is a three-position five-way valve, and the oil ports of the conversion valve (9) include an oil inlet (P9), an oil return port (T), and three working oil ports (M1, M2, M3); the posture adjustment multi-way valve group (11) includes a second combination valve group (111), and the second combination valve group (111) includes a control oil port (S0); the travel multi-way valve group (10) includes a first combination valve group (101), and the first combination valve group (101) includes a control oil port (S1); the working oil port (M1) is respectively connected to the oil inlet (P7) of the travel pilot valve and the control oil port (S1), the working oil port (M2) is connected to the oil inlet (P6) of the drilling pilot valve, and the working oil port (M3) is respectively connected to the oil inlet (P5) of the posture adjustment pilot valve and the control oil port (S0);

[0025] When the conversion valve (9) is in the front position, the oil inlet (P9) is connected to the working oil port (M2), and the two working oil ports (M1, M3) are connected to the oil return port (T);

[0026] When the conversion valve (9) is in the middle position, the oil inlet (P9) is connected to the working oil port (M1), and the two working oil ports (M2, M3) are connected to the oil return port (T);

[0027] When the conversion valve (9) is in the rear position, the oil inlet (P9) is connected to the working oil port (M3), and the two working oil ports (M1, M2) are connected to the oil return port (T).

[0028] Optionally, the pump motor control valve assembly (8) further comprises a pressure measuring port (C2) for monitoring pressure.

[0029] Optionally, the second hydraulic pump (3) is a load sensing pump.

[0030] In order to solve the above technical problems, the present invention also provides a drilling rig, comprising the hydraulic system of the drilling rig described in any one of the above items.

[0031] Beneficial Effects

[0032] The present invention provides a hydraulic system of a drilling rig and a drilling rig, the hydraulic system comprising: an electric motor (1), a first hydraulic pump (2), a second hydraulic pump (3), a drilling system, a walking system, a posture adjustment system, a pump motor control valve group (8) and a conversion valve (9);

[0033] The oil outlet of the first hydraulic pump (2) is connected to the oil inlet (P″′) of the posture adjustment system and the oil inlet (P2) of the drilling system;

[0034] The oil outlet (B) of the second hydraulic pump (3) is connected to the oil inlet (P1) of the traveling system and the drilling system; the feedback oil port (X) of the second hydraulic pump (3) is connected in sequence to the feedback oil port (LS2) of the traveling system, the external feedback oil port (LS1) of the traveling system, and the feedback oil port (LS) of the drilling system;

[0035] The pump motor control valve group (8) is respectively connected to the conversion valve (9), the drilling system, the walking system, and the posture adjustment system;

[0036] The pump motor control valve group (8) is used to adjust the oil inlet pressure of the drilling system, the walking system and the posture adjustment system;

[0037] The conversion valve (9) is used to control the working status of the drilling system, the walking system and the posture adjustment system;

[0038] Through the above-mentioned hydraulic system, the working states of the drilling system, the walking system and the posture adjustment system can be controlled. When the drilling system is working, the walking system and the posture adjustment system are not working, so as to prevent accidents caused by misoperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained like these drawings without paying creative work.

[0040] Figure 1A schematic diagram of a hydraulic system of a drilling rig provided by an embodiment of the present invention;

[0041] Figure 2 A schematic diagram of a conversion valve (9) provided in an embodiment of the present invention;

[0042] Figure 3 A schematic diagram of another conversion valve (9) provided in an embodiment of the present invention;

[0043] Figure 4 A schematic diagram of another conversion valve (9) provided in an embodiment of the present invention;

[0044] Figure 5 A schematic diagram of a first combined valve group (101) provided in an embodiment of the present invention;

[0045] Figure 6 A schematic diagram of a second combined valve group (111) provided in an embodiment of the present invention;

[0046] Figure 7 A schematic diagram of another conversion valve (9) provided in an embodiment of the present invention;

[0047] The reference numerals and components involved in the drawings are as follows:

[0048] An electric motor (1), a first hydraulic pump (2), a second hydraulic pump (3), a pump motor control valve group (8), a conversion valve (9), an oil inlet (P″′) of a posture adjustment system, an oil inlet (P2) of a drilling system, an oil inlet (P) of the pump motor control valve group (8), an oil inlet (P9) of the conversion valve (9),

[0049] The oil outlet (B) of the second hydraulic pump (3), the oil inlet (P1) of the travel system, the two oil inlets (P′, P″) of the drilling system, the feedback oil port (X) of the second hydraulic pump (3), the feedback oil port (LS2) of the travel system, the external feedback oil port (LS1) of the travel system, the feedback oil port (LS) of the drilling system,

[0050] Drilling multi-way valve group (12), drilling pilot valve (6), travel multi-way valve group (10), travel pilot valve (7), posture adjustment multi-way valve group (11), posture adjustment pilot valve (5),

[0051] six control oil ports (z1, z2, z3, y1, y2, y3) of the drilling multi-way valve group (12), six working oil ports (a1, a2, a3, b1, b2, b3) of the drilling pilot valve (6), a first hydraulically controlled reversing valve (121), a second hydraulically controlled reversing valve (122), a third hydraulically controlled reversing valve (123),

[0052] The four control oil ports (x1, x2, w1, w2) of the travel multi-way valve group (10), the four working oil ports (Xa1, Xa2, Xb1, Xb2) of the travel pilot valve (7), the fourth hydraulically controlled reversing valve (102),

[0053] twenty control oil ports (v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, u1, u2, u3, u4, u5, u6, u7, u8, u9, u10) of the attitude adjustment multi-way valve group (11), twenty working oil ports (Ta1, Ta2, Ta3, Ta4, Ta5, Ta6, Ta7, Ta8, Ta9, Ta10, Tb1, Tb2, Tb3, Tb4, Tb5, Tb6, Tb7, Tb8, Tb9, Tb10) of the attitude adjustment pilot valve (5), a fifth hydraulically controlled reversing valve (112),

[0054] A hydraulic motor (23), a feed cylinder (24), an anti-drilling valve group (13), a clamp (25), a chuck (26), a left travel motor (27), a right travel motor (28), a front upper support device (14), a lifting device (15), an upper slewing device (16), a lower slewing device (17), a rear upper support device (18), a left front lower support device (19), a right front lower support device (20), a left rear lower support device (21), a right rear lower support device (22), a runway compensation device (27), a first pressure regulating valve (81), a second pressure regulating valve (82), a throttle valve (83), a pressure measuring port (C2) of the pump motor control valve group (8),

[0055] The oil return port (T) of the conversion valve (9), the oil inlet port (P7) of the travel pilot valve, the oil inlet port (P6) of the drilling pilot valve, the oil inlet port (P5) of the attitude adjustment pilot valve, the first combined valve group (101), the second combined valve group (111),

[0056] Figure 1-Figure 3 :The two working oil ports (a0, b0) of the conversion valve (9),

[0057] Figure 4-Figure 6 : three working oil ports (L1, L2, L3) of the conversion valve (9), the return oil port (T5), the oil outlet port (A5), the working oil port (A5′), and the two control oil ports (j1, j2) of the second combined valve group (111), the oil inlet port (P1), the return oil port (T6), the oil outlet port (A6), the working oil port (A6′), and the two control oil ports (i1, i2) of the first combined valve group 101,

[0058] Figure 7 : three working oil ports (M1, M2, M3) of the conversion valve (9), the control oil port (S0) of the second combined valve group (111); and the control oil port (S1) of the first combined valve group (101). DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] This embodiment will provide a hydraulic system for a drilling rig, see Figure 1 , Figure 1 A schematic diagram of a hydraulic system of a drilling rig provided in this embodiment, the hydraulic system of the drilling rig includes:

[0061] An electric motor (1), a first hydraulic pump (2), a second hydraulic pump (3), a drilling system, a walking system, a posture adjustment system, a pump motor control valve group (8) and a conversion valve (9);

[0062] The oil outlet of the first hydraulic pump (2) is connected to the oil inlet (P″′) of the posture adjustment system and the oil inlet (P2) of the drilling system;

[0063] The oil outlet (B) of the second hydraulic pump (3) is connected to the oil inlet (P1) of the walking system and the drilling system; the feedback oil port (X) of the second hydraulic pump (3) is connected to the feedback oil port (LS2) of the walking system, the external feedback oil port (LS1) of the walking system, and the feedback oil port (LS) of the drilling system in sequence; optionally, the oil outlet (B) of the second hydraulic pump (3) is connected to the two oil inlets (P′, P″) of the drilling system;

[0064] The pump motor control valve group (8) is respectively connected to the conversion valve (9), the drilling system, the walking system, and the posture adjustment system;

[0065] The pump motor control valve group (8) is used to adjust the oil inlet pressure of the drilling system, the walking system and the posture adjustment system;

[0066] The switching valve (9) is used to control the working states of the drilling system, the walking system and the posture adjustment system; that is, the switching valve (9) is used to control whether the drilling system is working, whether the walking system is working and whether the posture adjustment system is working;

[0067] Through the above-mentioned hydraulic system, the working states of the drilling system, the walking system and the posture adjustment system can be controlled. When the drilling system is working, the walking system and the posture adjustment system are not working, so as to prevent accidents caused by misoperation.

[0068] The pump motor control valve group (8) can be supplied with oil by the second hydraulic pump (3) or the third hydraulic pump;

[0069] The pump motor control valve group (8) is used to adjust the displacement of the hydraulic motor (23), adjust the oil inlet (P9) of the conversion valve (9) and the working pressure of the pilot system, and adjust the working pressure of the pilot system, that is, adjust the oil inlet pressure of the oil inlet (P5) of the attitude adjustment pilot valve (5), the oil inlet (P6) of the drilling pilot valve (6), and the oil inlet (P7) of the travel pilot valve (7).

[0070] Optionally, in this embodiment, the drilling system comprises a drilling multi-way valve group (12), and a drilling pilot valve (6) and a drilling actuator respectively connected to the drilling multi-way valve group (12); the drilling pilot valve (6) controls the operation of the drilling multi-way valve group (12), thereby controlling the operation of the drilling actuator;

[0071] The walking system comprises a walking multi-way valve group (10), and a walking pilot valve (7) and a walking actuator respectively connected to the walking multi-way valve group (10); the walking pilot valve (7) controls the operation of the walking multi-way valve group (10), thereby controlling the operation of the walking actuator;

[0072] The attitude adjustment system comprises an attitude adjustment multi-way valve group (11), an attitude adjustment pilot valve (5) and an attitude adjustment actuator respectively connected to the attitude adjustment multi-way valve group (11); the attitude adjustment pilot valve (5) controls the operation of the attitude adjustment multi-way valve group (11), thereby controlling the operation of the attitude adjustment actuator.

[0073] Optionally, in this embodiment, the drilling multi-way valve group (12) includes six control oil ports (z1, z2, z3, y1, y2, y3); the oil port of the drilling pilot valve (6) includes six working oil ports (a1, a2, a3, b1, b2, b3); the drilling multi-way valve group (12) includes a first hydraulically controlled reversing valve (121), a second hydraulically controlled reversing valve (122), and a third hydraulically controlled reversing valve (123); the six control oil ports (z1, z2, z3, y1, y2, y3) respectively serve as control oil ports of the first hydraulically controlled reversing valve (121), the second hydraulically controlled reversing valve (122), and the third hydraulically controlled reversing valve (123); the six control oil ports (z1, z2, z3, y1, y2, y3) are respectively connected to the six working oil ports (a1, a2, a3, b1, b2, b3);

[0074] The travel multi-way valve group (10) comprises four control oil ports (x1, x2, w1, w2); the oil port of the travel pilot valve (7) comprises four working oil ports (Xa1, Xa2, Xb1, Xb2); the travel multi-way valve group (10) comprises two fourth hydraulically controlled reversing valves (102); the four control oil ports (x1, x2, w1, w2) respectively serve as the control oil ports of the two fourth hydraulically controlled reversing valves (102), and the four control oil ports (x1, x2, w1, w2) are respectively connected to the four working oil ports (Xa1, Xa2, Xb1, Xb2);

[0075] The attitude adjustment multi-way valve group (11) comprises twenty control oil ports (v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, u1, u2, u3, u4, u5, u6, u7, u8, u9, u10); the oil ports of the attitude adjustment pilot valve (5) comprise twenty working oil ports (Ta1, Ta2, Ta3, Ta4, Ta5, Ta6, Ta7, Ta8, Ta9, Ta10, Tb1, Tb2, Tb3, Tb4, Tb5, Tb6, Tb7, Tb8, Tb9, Tb10); the attitude adjustment multi-way valve group (11) comprises ten fifth hydraulically controlled reversing valves (112); the twenty control oil ports (v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, u1, u2, u3, u4, u5, u6, u7, u8, u9, u10) are respectively used as control oil ports of ten fifth hydraulically controlled reversing valves (112), and the twenty control oil ports (v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, u1, u2, u3, u4, u5, u6, u7, u8, u9, u10) are respectively connected to the twenty working oil ports (Ta1, Ta2, Ta3, Ta4, Ta5, Ta6, Ta7, Ta8, Ta9, Ta10, Tb1, Tb2, Tb3, Tb4, Tb5, Tb6, Tb7, Tb8, Tb9, Tb10).

[0076] Optionally, in the present embodiment, the drilling actuator comprises a hydraulic motor (23), a feed cylinder (24), an anti-drilling valve group (13), a clamp (25) and a chuck (26); and / or the walking actuator comprises a left walking motor (27) and a right walking motor (28); and / or the posture adjustment actuator comprises a front upper support device (14), a lifting device (15), an upper rotating device (16), a lower rotating device (17), a rear upper support device (18), a left front lower support device (19), a right front lower support device (20), a left rear lower support device (21), a right rear lower support device (22) and a runway compensation device (27).

[0077] Optionally, in this embodiment, the pump motor control valve group (8) includes a first pressure regulating valve (81), a second pressure regulating valve (82) and a throttle valve (83); the oil inlet (P) of the pump motor control valve group (8) is connected to the drilling actuator after passing through the first pressure regulating valve (81) and the throttle valve (83); optionally, the oil inlet (P) of the pump motor control valve group (8) is connected to the control oil port of the hydraulic motor (23) after passing through the first pressure regulating valve (81) and the throttle valve (83); the control oil adjusts the opening of the hydraulic motor (23), that is, controls the flow of the hydraulic motor (23), that is, controls the output speed of the hydraulic motor (23); the oil inlet (P) of the pump motor control valve group (8) is connected to the oil inlet (P9) of the conversion valve (9), the drilling pilot valve (6), the walking pilot valve (7), and the posture adjustment pilot valve (5) respectively through the second pressure regulating valve (82).

[0078] The function of the first pressure regulating valve (81) is to reduce the pressure of the oil (used for the propulsion and posture adjustment system of the drilling system, usually set at about 15 MPa) of the first hydraulic pump (2) (6.9-41.4 bar, 1 bar = 0.1 MPa; the use of high-pressure oil will cause the rear end throttle valve (83) to heat up, and will also make the throttle valve (83) difficult to adjust, that is, the pressure is too high and requires a lot of force to adjust); the throttle valve (83) is an adjustable throttle valve, which is used to adjust the flow rate, but it will also cause the pressure to drop. We use its pressure reduction to achieve this (if only the pressure reducing valve is used, it can also be adjusted, but because its pressure changes too quickly, it is not easy to adjust accurately).

[0079] In actual operation, the value of the first pressure regulating valve (81) is first set, and the throttle valve (83) is adjusted to change the opening of the hydraulic motor (23), so as to adjust the rotation speed of the hydraulic motor (23), that is, the rotation speed of the drilling rig.

[0080] The second pressure regulating valve (82) may also be called a pressure reducing valve, and has the same function as the first pressure regulating valve (81), except that it does not need to be adjustable (because the pilot valve generally has a working pressure of 3.5 MPa).

[0081] Optionally, in this embodiment, the pump motor control valve group (8) further comprises a pressure measuring port (C2) for monitoring pressure. The pressure measuring port (C2) can be connected to a pressure measuring device to monitor the pressure therein, such as a pressure gauge, a pressure measuring instrument, a pressure sensor, etc.

[0082] Optionally, in one embodiment, the oil port of the conversion valve (9) includes an oil inlet (P9), an oil return port (T), and two working oil ports (a0, b0); the posture adjustment multi-way valve group (11) includes a second combination valve group (111), the second combination valve group (111) includes a control oil port (S0), and the control oil port (S0) is connected to the working oil port (a0); the travel multi-way valve group (10) includes a first combination valve group (101), the first combination valve group (101) includes a control oil port (S1), and the control oil port (S1) is connected to the working oil port (b0);

[0083] When the conversion valve (9) is in the front position, the oil inlet (P9) is connected to the oil return port (T), and the two working oil ports (a0, b0) are connected to the oil return port (T);

[0084] When the conversion valve (9) is in the middle position, the oil inlet (P9) is disconnected, and the two working oil ports (a0, b0) are connected to the return oil port (T);

[0085] When the conversion valve (9) is in the rear position, the oil inlet (P9) is connected to the two working oil ports (a0, b0).

[0086] Optionally, when the switching valve (9) is in the front position, see Figure 1 , the oil inlet (P9) of the conversion valve (9) is connected to the oil return port (T), and the working oil ports (a0, b0) are connected to the oil return port (T); or refer to Figure 2 , when the conversion valve (9) is in the front position, the working oil port (a0) is connected to the working oil port (b0); or refer to Figure 3 When the conversion valve (9) is in the front position, the working oil port (a0) and the working oil port (b0) are disconnected; the drilling system, the walking system, and the posture adjustment system are not working;

[0087] When the conversion valve (9) is in the middle position, the working oil ports (a0, b0) are connected to the oil return port (T), and the oil inlet (P9) of the conversion valve (9) is blocked; when the drilling system is working, the working oil port (a0) is blocked, and the oil of the first hydraulic pump (2) reaches the oil inlet (P2) of the drilling system through the first connection of the posture adjustment system; when the walking system and the posture adjustment system are not working, the working oil port (b0) is blocked, and the oil of the second hydraulic pump (3) reaches the drilling system through the first connection of the walking system, and the control oil of the second hydraulic pump (3) reaches the feedback oil port (LS) of the drilling system in sequence through the feedback oil port (X) and the first connection of the walking system;

[0088] When the conversion valve (9) is in the rear position, the oil inlet (P9) of the conversion valve (9) is connected to the working oil ports (a0, b0); the walking system and the posture adjustment system are working, and the drilling system is not working; when the working oil port (a0) is connected to the oil, the oil of the first hydraulic pump (2) enters the posture adjustment system; when the working oil port (b0) is connected to the oil, the oil of the second hydraulic pump (3) enters the walking system.

[0089] This arrangement ensures that the posture adjustment and walking cannot be performed during drilling; drilling cannot be performed during posture adjustment and walking, in order to prevent accidents caused by misoperation. Walking is usually set at the rear end of the drilling rig, and is not in the same place as the drilling pilot valve (6) and the posture adjustment pilot valve (5), so misoperation generally does not occur. The posture adjustment and walking are set together because the walking operation and the posture adjustment operation are set in different places, and the chance of misoperation is very small; at the same time, a working condition in which all functions are closed can be set.

[0090] Alternatively, in another embodiment, see Figure 4 The conversion valve (9) is a three-position five-way valve. The oil ports of the conversion valve (9) include an oil inlet port (P9), an oil return port (T), and three working oil ports (L1, L2, and L3); see Figure 5 The multi-way valve group (10) includes a first combination valve group (101), see Figure 6 , the posture adjustment multi-way valve group (11) includes a second combined valve group (111);

[0091] The oil ports of the second combined valve group (111) include an oil inlet (P″′), an oil return port (T5), an oil outlet (A5), a working oil port (A5′), and two control oil ports (j1, j2); the working oil port (A5′) is connected to ten fifth hydraulically controlled reversing valves (112);

[0092] The oil ports of the first combined valve group 101 include an oil inlet (P1), an oil return port (T6), an oil outlet (A6), a working oil port (A6′), a feedback oil port (LS2), an external feedback oil port (LS1), and two control oil ports (i1, i2); the oil outlet (A6) is connected to two oil inlets (P′, P″) of the drilling system, that is, the oil outlet (A6) is connected to the drilling system, and the working oil port (A6′) is connected to two fourth hydraulically controlled reversing valves (102);

[0093] The working oil port (L1) is connected to the control oil port (i1) and the control oil port (j1) respectively, the working oil port (L2) is connected to the control oil port (j2), and the working oil port (L3) is connected to the control oil port (i2);

[0094] When the conversion valve (9) is in the front position, the oil inlet (P9) of the conversion valve (9) is connected to the working oil port (L1), the first combination valve group (101) and the second combination valve group (111) are both in the front position, the oil inlet (P1) of the first combination valve group 101 is connected to the oil outlet (A6), and the oil of the second hydraulic pump (3) is sent to the drilling system; the oil inlet (P″′) of the second combination valve group (111) is connected to the oil outlet (A5), and the oil of the second hydraulic pump (3) is sent to the drilling system; the drilling system is working, and the posture adjustment system and the walking system are not working;

[0095] When the conversion valve (9) is in the middle position, the oil inlet (P9) of the conversion valve (9) is connected to the working oil port (L2), the second combination valve group (111) is in the rear position, the oil of the second hydraulic pump (3) goes to the attitude adjustment multi-way valve group (11), the first combination valve group (101) is in the middle position, the oil inlet (P1) of the first combination valve group (101) is connected to the oil return port (T6), the oil of the second hydraulic pump (3) directly returns to the oil tank, the attitude adjustment system works, and the drilling system and the travel system do not work;

[0096] When the conversion valve (9) is in the rear position, the oil inlet (P9) of the conversion valve (9) is connected to the working oil port (L3), the first combination valve group (101) is in the rear position, at this time, the oil of the second hydraulic pump (3) goes to the walking multi-way valve group (10), the second combination valve group (111) is in the middle position, the oil inlet (P″′) of the second combination valve group 111 is connected to the oil return port (T5), and the oil of the first hydraulic pump (2) directly returns to the oil tank. At this time, the walking system is working, and the posture adjustment system and the drilling system are not working.

[0097] That is, drilling in the front position, adjusting posture in the middle position, and walking in the back position.

[0098] Alternatively, in yet another embodiment, see Figure 7 The conversion valve (9) is a three-position five-way valve, and the oil ports of the conversion valve (9) include an oil inlet (P9), an oil return port (T), and three working oil ports (M1, M2, M3); the posture adjustment multi-way valve group (11) includes a second combination valve group (111), and the second combination valve group (111) includes a control oil port (S0); the travel multi-way valve group (10) includes a first combination valve group (101), and the first combination valve group (101) includes a control oil port (S1); the working oil port (M1) is respectively connected to the oil inlet (P7) and the control oil port (S1) of the travel pilot valve, the working oil port (M2) is connected to the oil inlet (P6) of the drilling pilot valve, and the working oil port (M3) is respectively connected to the oil inlet (P5) and the control oil port (S0) of the posture adjustment pilot valve;

[0099] When the conversion valve (9) is in the front position, the oil inlet (P9) is connected to the working oil port (M2), and the two working oil ports (M1, M3) are connected to the return oil port (T);

[0100] When the conversion valve (9) is in the middle position, the oil inlet (P9) is connected to the working oil port (M1), and the two working oil ports (M2, M3) are connected to the return oil port (T);

[0101] When the conversion valve (9) is in the rear position, the oil inlet (P9) is connected to the working oil port (M3), and the two working oil ports (M1, M2) are connected to the return oil port (T).

[0102] Optionally, when the conversion valve (9) is in the front position, the oil inlet (P9) of the conversion valve (9) is connected to (P6), the oil inlet (P7) of the travel pilot valve, the oil inlet (P5) of the attitude adjustment pilot valve, the control oil port (S1), and the control oil port (S0) are all connected to the oil return port (T); the drilling pilot valve (6) is oiled, the drilling system works, the attitude adjustment pilot valve (5) and the travel pilot valve (7) cannot move, the attitude adjustment system and the travel system do not work, and the oil of the first hydraulic pump (2) and the second hydraulic pump (3) enters the drilling system;

[0103] When the conversion valve (9) is in the middle position, the oil inlet (P9) of the conversion valve (9) is connected with the oil inlet (P7) of the travel pilot valve and the control oil port (S1); the oil inlet (P5) of the attitude adjustment pilot valve, the control oil port (S0), and the oil inlet (P6) of the drilling pilot valve are connected with the oil return port (T); the travel pilot valve (7) is oiled, and the oil of the first hydraulic pump (2) enters the travel system, the travel system works, and the attitude adjustment system and the drilling system do not work;

[0104] When the conversion valve (9) is in the rear position, the oil inlet (P9) of the conversion valve (9) is connected with the oil inlet (P5) of the attitude adjustment pilot valve and the control oil port (S0); the oil inlet (P6) of the drilling pilot valve, the control oil port (S1), and the oil inlet (P7) of the travel pilot valve are connected with the oil return port (T); the attitude adjustment pilot valve is passed with oil, and the oil of the second hydraulic pump (3) enters the attitude adjustment system, while the travel system and the drilling system do not work.

[0105] With this arrangement, the travel system, drilling system and posture adjustment system are all set to interlock mode to prevent danger from improper operation.

[0106] Optionally, Figure 1 As shown, the oil outlet of the first hydraulic pump (2) is connected to the oil inlet (P″′) of the posture adjustment system, and then to the oil inlet (P2) of the drilling system through the second combination valve group (111), that is, there is a second combination valve group (111) between (P″′) and (P2);

[0107] Optionally, Figure 1 As shown, the oil outlet (B) of the second hydraulic pump (3) is connected to the oil inlet (P1) of the walking system and then to the drilling system via the first combination valve group (101), that is, there is a first combination valve group (101) between (P1) and the drilling system.

[0108] Optionally, in this embodiment, the second hydraulic pump (3) is a load-sensitive pump, and its rated flow rate is generally greater than that of the first hydraulic pump (2).

[0109] In order to solve the above technical problems, the present invention also provides a drilling rig, comprising the hydraulic system of any one of the above drilling rigs.

[0110] The above are only preferred embodiments of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the principles of the present invention. These improvements and supplements should also be regarded as the scope of protection of the present invention.

Claims

1. A hydraulic system for a drilling rig, characterized in that: include: An electric motor (1), a first hydraulic pump (2), a second hydraulic pump (3), a drilling system, a walking system, a posture adjustment system, a pump motor control valve group (8) and a conversion valve (9); the walking system includes a walking multi-way valve group (10); the posture adjustment system includes a posture adjustment multi-way valve group (11); The oil outlet of the first hydraulic pump (2) is connected to the oil inlet (P″′) of the posture adjustment system and the oil inlet (P2) of the drilling system; The oil outlet (B) of the second hydraulic pump (3) is connected to the oil inlet (P1) of the traveling system and the drilling system; the feedback oil port (X) of the second hydraulic pump (3) is connected in sequence to the feedback oil port (LS2) of the traveling system, the external feedback oil port (LS1) of the traveling system, and the feedback oil port (LS) of the drilling system; The pump motor control valve group (8) is respectively connected to the conversion valve (9), the drilling system, the walking system, and the posture adjustment system; The pump motor control valve group (8) is used to adjust the oil inlet pressure of the drilling system, the walking system and the posture adjustment system; The conversion valve (9) is used to control the working states of the drilling system, the walking system and the posture adjustment system; The oil ports of the conversion valve (9) include an oil inlet (P9), an oil return port (T), and two working oil ports a0 and b0; the posture adjustment multi-way valve group (11) includes a second combination valve group (111), the second combination valve group (111) includes a control oil port S0, and the control oil port S0 is connected to the working oil port a0; the travel multi-way valve group (10) includes a first combination valve group (101), the first combination valve group (101) includes a control oil port S1, and the control oil port S1 is connected to the working oil port b0; When the conversion valve (9) is in the front position, the oil inlet (P9) is connected to the oil return port (T), and the two working oil ports a0 and b0 are connected to the oil return port (T); When the conversion valve (9) is in the middle position, the oil inlet (P9) is disconnected, and the two working oil ports a0 and b0 are connected to the oil return port (T); When the conversion valve (9) is in the rear position, the oil inlet (P9) is connected to the two working oil ports a0 and b0; When the conversion valve (9) is in the middle position, the working oil ports a0 and b0 are connected to the oil return port (T), and the oil inlet (P9) of the conversion valve (9) is blocked; when the drilling system is working, the working oil port a0 is blocked, and the oil of the first hydraulic pump (2) reaches the oil inlet (P2) of the drilling system through the first connection of the posture adjustment system; when the walking system and the posture adjustment system are not working, the working oil port b0 is blocked, and the oil of the second hydraulic pump (3) reaches the drilling system through the first connection of the walking system, and the control oil of the second hydraulic pump (3) reaches the feedback oil port (LS) of the drilling system through the feedback oil port (X) of the second hydraulic pump (3) and the first connection of the walking system in sequence; When the conversion valve (9) is in the rear position, the oil inlet (P9) of the conversion valve (9) is connected to the working oil ports a0 and b0; the walking system and the posture adjustment system are working, and the drilling system is not working; when the working oil port a0 is connected to the oil, the oil of the first hydraulic pump (2) enters the posture adjustment system; when the working oil port b0 is connected to the oil, the oil of the second hydraulic pump (3) enters the walking system.

2. The hydraulic system according to claim 1, characterized in that: The drilling system comprises a drilling multi-way valve group (12), and a drilling pilot valve (6) and a drilling actuator respectively connected to the drilling multi-way valve group (12); the drilling pilot valve (6) controls the operation of the drilling multi-way valve group (12), thereby controlling the operation of the drilling actuator; The walking system further comprises a walking pilot valve (7) and a walking actuator respectively connected to the walking multi-way valve group (10); the walking pilot valve (7) controls the operation of the walking multi-way valve group (10), thereby controlling the operation of the walking actuator; The attitude adjustment system further comprises an attitude adjustment pilot valve (5) and an attitude adjustment actuator respectively connected to the attitude adjustment multi-way valve group (11); the attitude adjustment pilot valve (5) controls the operation of the attitude adjustment multi-way valve group (11), thereby controlling the operation of the attitude adjustment actuator.

3. The hydraulic system according to claim 2, characterized in that: The drilling multi-way valve group (12) comprises six control oil ports (z1, z2, z3, y1, y2, y3); the oil port of the drilling pilot valve (6) comprises six working oil ports (a1, a2, a3, b1, b2, b3); the drilling multi-way valve group (12) comprises a first hydraulically controlled reversing valve (121), a second hydraulically controlled reversing valve (122), and a third hydraulically controlled reversing valve (123); the six control oil ports (z1, z2, z3, y1, y2, y3) respectively serve as control oil ports of the first hydraulically controlled reversing valve (121), the second hydraulically controlled reversing valve (122), and the third hydraulically controlled reversing valve (123); the six control oil ports (z1, z2, z3, y1, y2, y3) are respectively connected to the six working oil ports (a1, a2, a3, b1, b2, b3); The travel multi-way valve group (10) comprises four control oil ports (x1, x2, w1, w2); the oil port of the travel pilot valve (7) comprises four working oil ports (Xa1, Xa2, Xb1, Xb2); the travel multi-way valve group (10) comprises two fourth hydraulically controlled reversing valves (102); the four control oil ports (x1, x2, w1, w2) respectively serve as the control oil ports of the two fourth hydraulically controlled reversing valves (102); the four control oil ports (x1, x2, w1, w2) are respectively connected to the four working oil ports (Xa1, Xa2, Xb1, Xb2); The attitude adjustment multi-way valve group (11) comprises twenty control oil ports (v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, u1, u2, u3, u4, u5, u6, u7, u8, u9, u10); the oil ports of the attitude adjustment pilot valve (5) comprise twenty working oil ports (Ta1, Ta2, Ta3, Ta4, Ta5, Ta6, Ta7, Ta8, Ta9, Ta10, Tb1, Tb2, Tb3, Tb4, Tb5, Tb6, Tb7, Tb8, Tb9, Tb10); the attitude adjustment multi-way valve group (11) comprises ten fifth hydraulically controlled reversing valves (112); the twenty control oil ports (v1, v2, v3, v4, v5 , v6, v7, v8, v9, v10, u1, u2, u3, u4, u5, u6, u7, u8, u9, u10) are respectively used as the control oil ports of the ten fifth hydraulically controlled reversing valves (112); the twenty control oil ports (v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, u1, u2, u3, u4, u5, u6, u7, u8, u9, u10) are respectively connected to the twenty working oil ports (Ta1, Ta2, Ta3, Ta4, Ta5, Ta6, Ta7, Ta8, Ta9, Ta10, Tb1, Tb2, Tb3, Tb4, Tb5, Tb6, Tb7, Tb8, Tb9, Tb10).

4. The hydraulic system according to claim 2, characterized in that: The drilling actuator comprises a hydraulic motor (23), a feed cylinder (24), an anti-drilling valve group (13), a clamp (25) and a chuck (26); and / or the walking actuator comprises a left walking motor (27) and a right walking motor (28); and / or the posture adjustment actuator comprises a front upper support device (14), a lifting device (15), an upper rotating device (16), a lower rotating device (17), a rear upper support device (18), a left front lower support device (19), a right front lower support device (20), a left rear lower support device (21), a right rear lower support device (22) and a runway compensation device.

5. The hydraulic system according to claim 2, characterized in that: The pump-motor control valve group (8) comprises a first pressure regulating valve (81), a second pressure regulating valve (82) and a throttle valve (83); the oil inlet (P) of the pump-motor control valve group (8) is connected to the drilling actuator after passing through the first pressure regulating valve (81) and the throttle valve (83); the oil inlet (P) of the pump-motor control valve group (8) is connected to the oil inlet (P9) of the conversion valve (9), the drilling pilot valve (6), the walking pilot valve (7) and the posture adjustment pilot valve (5) respectively through the second pressure regulating valve (82).

6. The hydraulic system according to any one of claims 1 to 5, characterized in that: The pump motor control valve assembly (8) also includes a pressure measuring port (C2) for monitoring pressure.

7. The hydraulic system according to any one of claims 1 to 5, characterized in that: The second hydraulic pump (3) is a load sensing pump.

8. A drilling rig, characterized in that: A hydraulic system comprising a drilling rig as claimed in any one of claims 1 to 7.

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