Hydraulic control system for rapid pressurization and extraction of the rotary drilling rig's power head

Abstract

The present invention discloses a quick pressurization and pulling hydraulic control system for the power head of a rotary drilling rig, which includes a first hydraulic pump, a first multi-way directional control valve, and a first motor connected through pipelines, and a second hydraulic pump, a second multi-way directional control valve, and a second motor connected through pipelines. The pilot oil port a1 of the first multi-way directional control valve and the pilot oil port a2 of the second multi-way directional control valve are connected through a first pilot oil circuit X1, and the pilot oil port b1 of the first multi-way directional control valve and the pilot oil port b2 of the second multi-way directional control valve are connected through a second pilot oil circuit X2. A first solenoid valve is arranged on the first pilot oil circuit X1, a second solenoid valve is arranged on the second pilot oil circuit X2, and a switching valve is arranged between the second multi-way directional control valve and the second motor. The quick pressurization and pulling hydraulic control system for the power head of the present invention increases the input flow rate of the hydraulic oil in the pressurization circuit, improves the working efficiency of the pressurization circuit, and speeds up the pressurization and pulling speed of the power head.

Description

Technical Field

[0001] The present invention relates to the technical field of rotary drilling rigs, and particularly to a hydraulic control system for rapid pressurization and pulling out of the power head of a rotary drilling rig. Background Art

[0002] A rotary drilling rig is a hole-forming machine used for the construction of cast-in-place piles in foundation engineering. Due to its high efficiency, low pollution, and multiple functions, it is widely used in the construction of foundation engineering such as roads, bridges, and docks.

[0003] The hydraulic system of a rotary drilling rig is composed of an energy device (hydraulic pump), an actuator (hydraulic cylinder and hydraulic motor), a control and regulating device (various hydraulic valves for controlling the flow and direction of fluids), auxiliary devices (oil tank, filter, accumulator, etc.), and a transmission medium using hydraulic pipelines in a certain manner. Using hydraulic oil as a medium, the mechanical energy of the engine is converted into easily transferable hydraulic energy to achieve various actions. The main actions include: expanding the shoe and traveling, mast adjustment, drilling process, lifting process, and unloading. The hydraulic system can be divided into: pump control circuit, power head rotation circuit, pressurization circuit, main and auxiliary winch circuits, luffing circuit, upper carriage rotation circuit, and traveling circuit. Among them, the main functions of the pressurization circuit of the power head are: after the pile hole positioning is completed, lower the power head so that the drill bucket reaches the foundation surface; provide downward pressure during the rotation drilling process of the power head to ensure an effective pile hole; cooperate with the main winch during the lifting process to lift the drill bucket above the water level for easy soil unloading.

[0004] In the prior art, the hydraulic control circuit for the pressurization and pulling out actions of the power head pressurization circuit is shown in Figure 1 : When the power head needs pressurization and pulling out actions, operate the pilot control oil to enter port a or port b of the first multi-way directional control valve 02 to control the commutation of the first multi-way directional control valve 02. When the pilot control oil enters port a of the first multi-way directional control valve 02, the first multi-way directional control valve 02 commutes, and the hydraulic oil in the first hydraulic pump 03 enters port A of the first motor 01. The hydraulic oil coming out of port B of the first motor 01 returns to the oil tank through the first multi-way directional control valve 02 to complete the lowering action and provide downward pressure during the downward drilling process of the power head.

[0005] When the pilot control oil enters port b of the first multi-way directional control valve 02, the first multi-way directional control valve 02 commutes, and the hydraulic oil in the first hydraulic pump 03 enters port B of the first motor 01. The hydraulic oil coming out of port B of the first motor 01 returns to the oil tank through the first multi-way directional control valve 02 to complete the lifting action.

[0006] The hydraulic control circuit for the pressurization and pulling out actions of the auxiliary winch circuit is shown in Figure 2: When the auxiliary hoist needs to perform lifting and lowering operations, an operation is carried out to make the pilot control oil enter the aL2 or bL2 oil port of the second multi-way directional control valve 05. When the pilot control oil enters the aL2 port of the second multi-way directional control valve 05, the second multi-way directional control valve 05 changes its direction, and the hydraulic oil in the second hydraulic pump 06 enters the A port of the second motor 04. The hydraulic oil coming out from the B port of the second motor 04 returns to the fuel tank through the second multi-way directional control valve 05, completing the lowering operation. When the pilot control oil enters the bL2 port of the second multi-way directional control valve 05, the second multi-way directional control valve 05 changes its direction, and the hydraulic oil in the second hydraulic pump 06 enters the B port of the second motor 04. The hydraulic oil coming out from the A port of the second motor 04 returns to the fuel tank through the second multi-way directional control valve 05, completing the lifting operation.

[0007] From the above analysis, it can be seen that the auxiliary hoist circuit and the power head pressurization circuit of the current hydraulic system of the rotary drilling rig are independent hydraulic control circuits, and there is no intersection between them. The first motor 01 for pressurization and extraction in the pressurization circuit of the power head is controlled by a single valve of the first multi-way directional control valve 02. The flow rate of the single valve is small and cannot meet the speed requirements for rapid pressurization and extraction of the power head. Summary of the Invention

[0008] In view of this, the present invention provides a hydraulic control system for rapid pressurization and extraction of the power head of a rotary drilling rig, which increases the input flow rate of the hydraulic oil in the pressurization circuit, improves the working efficiency of the pressurization circuit, and speeds up the pressurization and extraction speed of the power head.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A hydraulic control system for rapid pressurization and extraction of the power head of a rotary drilling rig, comprising a first hydraulic pump, a first multi-way directional control valve and a first motor connected through pipelines, a second hydraulic pump, a second multi-way directional control valve and a second motor connected through pipelines. The pilot oil port a1 of the first multi-way directional control valve and the pilot oil port a2 of the second multi-way directional control valve are connected through a first pilot oil circuit X1, and the pilot oil port b1 of the first multi-way directional control valve and the pilot oil port b2 of the second multi-way directional control valve are connected through a second pilot oil circuit X2;

[0011] A first solenoid valve is provided on the first pilot oil circuit X1, a second solenoid valve is provided on the second pilot oil circuit X2, and a switching valve is provided between the second multi-way directional control valve and the second motor. When the switching valve switches to the first position, the oil port of the switching valve is connected to the first motor through a pipeline. When the switching valve switches to the second position, the oil port of the switching valve is connected to the second motor through a pipeline.

[0012] Optionally, the switching valve includes a first hydraulically controlled directional sub-valve, a second hydraulically controlled directional sub-valve, and a third solenoid valve. The third solenoid valve is used to control a third pilot oil circuit X3, and the third pilot oil circuit X3 is communicated with a pilot oil port a3 of the first hydraulically controlled directional sub-valve and a pilot oil port a4 of the second hydraulically controlled directional sub-valve.

[0013] Optionally, a P3 port of the first hydraulically controlled directional sub-valve is communicated with an A2 port of the second multi-way directional valve, a P4 port of the second hydraulically controlled directional sub-valve is communicated with a B2 port of the second multi-way directional valve, and a T3 port of the first hydraulically controlled directional sub-valve and a T4 port of the second hydraulically controlled directional sub-valve are both communicated with an oil tank.

[0014] Optionally, a connecting pipeline between an A3 port of the first hydraulically controlled directional sub-valve and an A1 port of the first multi-way directional valve is communicated, and a connecting pipeline between an A4 port of the second hydraulically controlled directional sub-valve and a B1 port of the first multi-way directional valve is communicated; a B3 port of the first hydraulically controlled directional sub-valve is communicated with an A port of the second motor, and a B4 port of the second hydraulically controlled directional sub-valve is communicated with a B port of the second motor.

[0015] Optionally, when the third solenoid valve is energized, the switching valve switches to the first position, the second hydraulic pump supplies hydraulic oil to the first motor, and the second hydraulic pump and the first hydraulic pump supply hydraulic oil to the pressurizing circuit at the same time; when the third solenoid valve is de-energized, the switching valve returns to the second position, the second hydraulic pump supplies hydraulic oil to the second motor, and the second hydraulic pump supplies hydraulic oil to the auxiliary hoist circuit.

[0016] Optionally, it further includes an auxiliary hoist pilot lifting oil circuit X4 and an auxiliary hoist pilot lowering oil circuit X5; the auxiliary hoist pilot lifting oil circuit X4 is communicated with the second multi-way directional valve through a first solenoid valve, and the auxiliary hoist pilot lowering oil circuit X5 is communicated with the second multi-way directional valve through a second solenoid valve; when the first solenoid valve is energized, the first pilot oil circuit X1 is communicated with a pilot oil port a2 of the second multi-way directional valve, and when the first solenoid valve is de-energized, the auxiliary hoist pilot lifting oil circuit X4 is communicated with the pilot oil port a2 of the second multi-way directional valve; when the second solenoid valve is energized, the second pilot oil circuit X2 is communicated with a pilot oil port b2 of the second multi-way directional valve, and when the second solenoid valve is de-energized, the auxiliary hoist pilot lowering oil circuit X5 is communicated with the pilot oil port b2 of the second multi-way directional valve.

[0017] Optionally, the switching valve includes a first hydraulically controlled reversing sub-valve, a second hydraulically controlled reversing sub-valve, a fourth solenoid valve, a fifth solenoid valve, and a shuttle valve. The fourth solenoid valve is connected to the first pilot oil circuit X1, the fifth solenoid valve is connected to the second pilot oil circuit X2, and the first pilot oil circuit X1 and the second pilot oil circuit X2 are communicated through a sixth pilot oil circuit X6. The communication position between the first pilot oil circuit X1 and the sixth pilot oil circuit X6 is arranged between the fourth solenoid valve and the first solenoid valve, and the communication position between the second pilot oil circuit X2 and the sixth pilot oil circuit X6 is arranged between the fifth solenoid valve and the second solenoid valve. A shuttle valve is arranged on the sixth pilot oil circuit X6, and the pilot oil ports of the first hydraulically controlled reversing sub-valve and the second hydraulically controlled reversing sub-valve are communicated with the oil outlet of the shuttle valve.

[0018] Optionally, the first oil inlet of the shuttle valve is communicated with the first pilot oil circuit X1, and the second oil inlet of the shuttle valve is communicated with the second pilot oil circuit X2.

[0019] As can be seen from the above technical solutions, for the quick pressurization and pulling hydraulic control system of the power head of the rotary drilling rig provided by the present invention, without changing the hydraulic system functions of the original pressurization circuit and the auxiliary hoist circuit, by adding a first solenoid valve and a second solenoid valve in the pilot oil circuit of the hydraulic control system, it is convenient to control the pilot oil introduced into the second multi-way reversing valve. By setting the switching valve, it is convenient to control whether the hydraulic oil at the rear end of the second multi-way reversing valve flows to the first motor or the second motor. When the hydraulic oil at the rear end of the second multi-way reversing valve flows to the first motor, the second multi-way reversing valve and the first multi-way reversing valve supply oil to the first motor together, thereby increasing the input flow rate of the hydraulic oil of the first motor in the pressurization circuit, improving the working efficiency of the first motor in the pressurization circuit, and thus accelerating the pressurization and pulling speed of the power head to meet the speed requirements of the quick pressurization and pulling of the power head. Description of the Drawings

[0020] 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 some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic diagram of the hydraulic control of the power head pressurization circuit in the prior art;

[0022] Figure 2 It is a schematic diagram of the hydraulic control of the auxiliary hoist circuit in the prior art;

[0023] Figure 3Schematic diagram of the hydraulic control system for rapid pressurization and pulling of the rotary head of a rotary drilling rig in an embodiment of the present invention;

[0024] Figure 4 Schematic diagram of the hydraulic control system for rapid pressurization and pulling of the rotary head of a rotary drilling rig in another embodiment of the present invention.

[0025] Wherein:

[0026] 01, first motor; 02, first multi-way directional control valve; 03, first hydraulic pump; 04, second motor; 05, second multi-way directional control valve; 06, second hydraulic pump.

[0027] 1, first motor; 2, first multi-way directional control valve; 3, first hydraulic pump; 4, first solenoid valve; 5, second motor; 6, switching valve; 601, first pilot-operated directional control sub-valve; 602, second pilot-operated directional control sub-valve; 603, third solenoid valve; 604, fourth solenoid valve; 605, shuttle valve; 606, fifth solenoid valve; 7, second multi-way directional control valve; 8, second solenoid valve; 9, second hydraulic pump. Specific embodiments

[0028] The present invention discloses a hydraulic control system for rapid pressurization and pulling of the rotary head of a rotary drilling rig, which increases the input flow rate of the hydraulic oil in the pressurization circuit, improves the working efficiency of the pressurization circuit, and speeds up the pressurization and pulling speeds of the rotary head.

[0029] 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 of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] Please refer to Figure 3 and Figure 4 , the hydraulic control system for rapid pressurization and pulling of the rotary head of the rotary drilling rig of the present invention includes a first hydraulic pump 3, a first multi-way directional control valve 2 and a first motor 1 connected in series through pipelines, and also includes a second hydraulic pump 9, a second multi-way directional control valve 7 and a second motor 5 connected through pipelines. The first hydraulic pump 3, the first multi-way directional control valve 2 and the first motor 1 connected through pipelines form a pressurization circuit for controlling the pressurization or pulling of the rotary head. The second hydraulic pump 9, the second multi-way directional control valve 7 and the second motor 5 connected through pipelines form a secondary hoist circuit.

[0031] The pilot oil port a1 of the first multi-way directional control valve 2 and the pilot oil port a2 of the second multi-way directional control valve 7 are connected through the first pilot oil circuit X1, and the pilot oil port b1 of the first multi-way directional control valve 2 and the pilot oil port b2 of the second multi-way directional control valve 7 are connected through the second pilot oil circuit X2. By setting it like this, the pilot oil port a1 of the first multi-way directional control valve 2 and the pilot oil port a2 of the second multi-way directional control valve 7 can simultaneously receive oil, and the pilot oil port b1 of the first multi-way directional control valve 2 and the pilot oil port b2 of the second multi-way directional control valve 7 can simultaneously receive oil, so as to facilitate controlling the first multi-way directional control valve 2 and the second multi-way directional control valve 7 to change directions simultaneously, realizing that two hydraulic circuits simultaneously supply hydraulic oil to the first motor 1 to achieve pressurization or extraction.

[0032] A first solenoid valve 4 is provided on the first pilot oil circuit X1, a second solenoid valve 8 is provided on the second pilot oil circuit X2, and a switching valve 6 is provided between the second multi-way directional control valve 7 and the second motor 5. When the switching valve 6 is switched to the first position, the oil port of the switching valve 6 is connected to the first motor 1 through a pipeline to supplement hydraulic oil to the power head pressurization circuit. When the switching valve 6 is switched to the second position, the oil port of the switching valve 6 is connected to the second motor 5 through a pipeline. At this time, the second multi-way directional control valve 7 is used to control the commutation of the hydraulic oil in the auxiliary hoist circuit. The first solenoid valve 4 is used to control whether the pilot oil port a2 of the second multi-way directional control valve 7 is connected to the first pilot oil circuit X1, and the second solenoid valve 8 is used to control whether the pilot oil port b2 of the second multi-way directional control valve 7 is connected to the second pilot oil circuit X2.

[0033] Among them, a relief valve is provided between the A port and the B port of the first motor 1, and the relief valve is the same as the relief valve in the pressurization circuit in the prior art, which will not be elaborated here. A relief valve is provided between the A port and the B port of the second motor 5, and the relief valve is the same as the relief valve in the auxiliary hoist circuit in the prior art, which will not be elaborated here. The pressurization circuit is used to lift and lower the power head and transmit downward pressure during the process of the power head drilling down. A motor is a device that converts hydraulic energy into rotational output mechanical energy. The first motor 1 is used to lift and lower the power head. The second motor 5 is an auxiliary lifting device, which will not be used during normal construction. Therefore, during normal construction, the second multi-way directional control valve 7 is commutated to switch to the pipeline direction for supplying hydraulic oil to the first motor 1, and together with the first multi-way directional control valve 2, supply oil to the first motor 1 in the pressurization circuit, thereby increasing the input flow rate of the first motor 1 and improving work efficiency.

[0034] The quick pressurization and pulling hydraulic control system of the rotary drilling rig of the present invention, without changing the hydraulic system functions of the original pressurization circuit and the auxiliary hoist circuit, by adding a first solenoid valve 4 and a second solenoid valve 8 in the pilot oil circuit of the hydraulic control system, facilitates the control of the pilot oil flowing into the second multi-way directional control valve 7. By setting a switching valve 6, it is convenient to control whether the hydraulic oil at the rear end of the second multi-way directional control valve 7 flows to the first motor 1 or the second motor 5. When the hydraulic oil at the rear end of the second multi-way directional control valve 7 flows to the first motor 1, the second multi-way directional control valve 7 and the first multi-way directional control valve 2 supply oil to the first motor 1 together, thereby increasing the input flow rate of the hydraulic oil of the first motor 1 in the pressurization circuit, improving the working efficiency of the first motor 1 in the pressurization circuit, and thus accelerating the pressurization and pulling speed of the power head to meet the speed requirements of the quick pressurization and pulling of the power head.

[0035] In an embodiment, the switching valve 6 includes a first hydraulic control reversing sub-valve 601, a second hydraulic control reversing sub-valve 602 and a third solenoid valve 603. The third solenoid valve 603 is used to control a third pilot oil circuit X3. The third pilot oil circuit X3 is communicated with a pilot oil port a3 of the first hydraulic control reversing sub-valve 601 and a pilot oil port a4 of the second hydraulic control reversing sub-valve 602. When the third solenoid valve 603 is energized, the third pilot oil circuit X3 flows into the pilot oil port a3 and the pilot oil port a4, and the first hydraulic control reversing sub-valve 601 and the second hydraulic control reversing sub-valve 602 are reversed. The oil ports of the two are communicated with the first motor 1, and the second hydraulic pump 9 provides hydraulic oil for the first motor 1, that is, provides hydraulic oil for the pressurization circuit. At this time, the second hydraulic pump 9 and the first hydraulic pump 3 simultaneously provide hydraulic oil for the pressurization circuit. When the third solenoid valve 603 is de-energized, the first hydraulic control reversing sub-valve 601 and the second hydraulic control reversing sub-valve 602 return to their original positions, and the second hydraulic pump 9 provides hydraulic oil for the second motor 5, that is, provides hydraulic oil for the auxiliary hoist circuit, and the first hydraulic pump 3 alone provides hydraulic oil for the pressurization circuit.

[0036] Specifically, the P3 port of the first hydraulic control reversing sub-valve 601 is communicated with the A2 port of the second multi-way directional control valve 7, and the P4 port of the second hydraulic control reversing sub-valve 602 is communicated with the B2 port of the second multi-way directional control valve 7. The T3 port of the first hydraulic control reversing sub-valve 601 and the T4 port of the second hydraulic control reversing sub-valve 602 are both communicated with the fuel tank. The A3 port of the first hydraulic control reversing sub-valve 601 is communicated with the connecting pipeline of the A1 port of the first multi-way directional control valve 2, and the A4 port of the second hydraulic control reversing sub-valve 602 is communicated with the connecting pipeline of the B1 port of the first multi-way directional control valve 2. The B3 port of the first hydraulic control reversing sub-valve 601 is communicated with the A port of the second motor 5, and the B4 port of the second hydraulic control reversing sub-valve 602 is communicated with the B port of the second motor 5.

[0037] The quick pressurization and pulling hydraulic control system of the rotary drilling rig of the present invention further includes a secondary hoist pilot lift oil circuit X4 and a secondary hoist pilot lower oil circuit X5. The secondary hoist pilot lift oil circuit X4 is connected to the second multi-way directional control valve 7 through a first solenoid valve 4. The first solenoid valve 4 is used to control the switching of the pilot oil circuit entering the a2 port of the second multi-way directional control valve 7. The pilot oil circuit entering the a2 port of the second multi-way directional control valve 7 includes the secondary hoist pilot lift oil circuit X4 and the first pilot oil circuit X1. The secondary hoist pilot lower oil circuit X5 is connected to the second multi-way directional control valve 7 through a second solenoid valve 8. The second solenoid valve 8 is used to control the switching of the pilot oil circuit entering the b2 port of the second multi-way directional control valve 7. The pilot oil circuit entering the b2 port of the second multi-way directional control valve 7 includes the secondary hoist pilot lower oil circuit X5 and the second pilot oil circuit X2.

[0038] Specifically, when the first solenoid valve 4 is energized, the first pilot oil circuit X1 is communicated with the pilot oil port a2 of the second multi-way directional control valve 7. When the first solenoid valve 4 is de-energized, the secondary hoist pilot lift oil circuit X4 is communicated with the pilot oil port a2 of the second multi-way directional control valve 7. When the second solenoid valve 8 is energized, the second pilot oil circuit X2 is communicated with the pilot oil port b2 of the second multi-way directional control valve 7. When the second solenoid valve 8 is de-energized, the secondary hoist pilot lower oil circuit X5 is communicated with the pilot oil port b2 of the second multi-way directional control valve 7.

[0039] When the rotary drilling rig power head of this embodiment performs quick pressurization work: the first solenoid valve 4 and the third solenoid valve 603 are energized. After the first solenoid valve 4 is energized, the pilot control oil of the first pilot oil circuit X1 simultaneously enters the pilot oil port a1 of the first multi-way directional control valve 2 and the pilot oil port a2 of the second multi-way directional control valve 7, and the first multi-way directional control valve 2 and the second multi-way directional control valve 7 are commutated. When the third solenoid valve 603 is energized, the pilot control oil of the third pilot oil circuit X3 simultaneously enters the pilot oil port a3 of the first hydraulic control directional control valve 601 and the pilot oil port a4 of the second hydraulic control directional control valve 602, and the first hydraulic control directional control valve 601 and the second hydraulic control directional control valve 602 are commutated. The hydraulic oil output by the first hydraulic pump 3 and the hydraulic oil output by the second hydraulic pump 9 are combined after passing through the first multi-way directional control valve 2 and the second multi-way directional control valve 7 respectively, and then enter the A port of the first motor 1. The hydraulic oil coming out of the B port of the first motor 1 returns to the fuel tank through the first multi-way directional control valve 2 and the second multi-way directional control valve 7 respectively, completing the lowering action and providing downward pressure during the process of the power head drilling down.

[0040] When the power head of the rotary drilling rig in this embodiment performs rapid pulling: the second solenoid valve 8 and the third solenoid valve 603 are energized. When the second solenoid valve 8 is energized, the pilot control oil of the second pilot oil circuit X2 simultaneously enters the pilot oil port b1 of the first multi-way directional control valve 2 and the pilot oil port b2 of the second multi-way directional control valve 7, and the first multi-way directional control valve 2 and the second multi-way directional control valve 7 change their positions. When the third solenoid valve 603 is energized, the pilot control oil of the third pilot oil circuit X3 simultaneously enters the pilot oil port a3 of the first pilot-operated directional control sub-valve 601 and the pilot oil port a4 of the second pilot-operated directional control sub-valve 602, and the first pilot-operated directional control sub-valve 601 and the second pilot-operated directional control sub-valve 602 change their positions. The hydraulic oil output by the first hydraulic pump 3 and the hydraulic oil output by the second hydraulic pump 9 merge after passing through the first multi-way directional control valve 2 and the second multi-way directional control valve 7 respectively, and then enter the B port of the first motor 1. The hydraulic oil coming out of the A port of the first motor 1 returns to the fuel tank through the first multi-way directional control valve 2 and the second multi-way directional control valve 7 respectively, completing the rapid lifting action.

[0041] It can be understood that the first solenoid valve 4 and the second solenoid valve 8 cooperate with the switching valve 6. When the power head of the rotary drilling rig needs rapid pressurization and pulling, the relevant solenoid valves are energized, so that the pilot oil controlling the first multi-way directional control valve 2 can also control the second multi-way directional control valve 7 at the same time.

[0042] Auxiliary winch operation: The first solenoid valve 4, the second solenoid valve 8 and the third solenoid valve 603 are all not energized, and the first pilot-operated directional control sub-valve 601 and the second pilot-operated directional control sub-valve 602 do not change their positions. The pilot control oil enters the a2 oil port of the second multi-way directional control valve 7 through the auxiliary winch pilot lift oil circuit X4, and the hydraulic oil output by the second hydraulic pump 9 reaches the second motor 5 through the second multi-way directional control valve 7 and the switching valve 6, thus realizing the auxiliary winch lifting action. The pilot control oil enters the b2 oil port of the second multi-way directional control valve 7 through the auxiliary winch pilot lower oil circuit X5, and the hydraulic oil output by the second hydraulic pump 9 reaches the second motor 5 through the second multi-way directional control valve 7 and the switching valve 6, thus realizing the auxiliary winch lowering action.

[0043] In another embodiment, as Figure 4 shown, the switching valve 6 includes a first pilot-operated directional control sub-valve 601, a second pilot-operated directional control sub-valve 602, a fourth solenoid valve 604, a fifth solenoid valve 606 and a shuttle valve 605. The fourth solenoid valve 604 is connected to the first pilot oil circuit X1, the fifth solenoid valve 606 is connected to the second pilot oil circuit X2, and the first pilot oil circuit X1 and the second pilot oil circuit X2 are connected through a sixth pilot oil circuit X6.

[0044] Among them, the front end position of the first pilot oil circuit X1 near the fourth solenoid valve 604 is communicated with the pilot oil port a1 of the first multi-way directional control valve 2, and the front end position of the second pilot oil circuit X2 near the fifth solenoid valve 606 is communicated with the pilot oil port b1 of the first multi-way directional control valve 2. The front end position here refers to the position where the hydraulic oil arrives first when flowing, that is, the end of the fourth solenoid valve 604 away from the first solenoid valve 4, or the end of the fifth solenoid valve 606 away from the second solenoid valve 8. The connection position between the first pilot oil circuit X1 and the sixth pilot oil circuit X6 is set between the fourth solenoid valve 604 and the first solenoid valve 4, and the connection position between the second pilot oil circuit X2 and the sixth pilot oil circuit X6 is set between the fifth solenoid valve 606 and the second solenoid valve 8.

[0045] In order to prevent the hydraulic oil flowing from the first pilot oil circuit X1 into the sixth pilot oil circuit X6 from interfering with the hydraulic oil flowing from the second pilot oil circuit X2 into the sixth pilot oil circuit X6, a shuttle valve 605 is provided on the sixth pilot oil circuit X6. The first inlet of the shuttle valve 605 is communicated with the first pilot oil circuit X1, and the second inlet of the shuttle valve 605 is communicated with the second pilot oil circuit X2. When the first inlet of the shuttle valve 605 is communicated with the outlet, the second inlet of the shuttle valve 605 is disconnected from the outlet; when the second inlet of the shuttle valve 605 is communicated with the outlet, the first inlet of the shuttle valve 605 is disconnected from the outlet. The pilot oil ports of the first hydraulic control directional control sub-valve 601 and the second hydraulic control directional control sub-valve 602 are communicated with the outlet of the shuttle valve 605. In this embodiment, other structures refer to the above embodiment and will not be elaborated here.

[0046] When the power head of the rotary drilling rig in this embodiment performs rapid pressurization: the first solenoid valve 4 and the fourth solenoid valve 604 are energized. After the first solenoid valve 4 and the fourth solenoid valve 604 are energized, the pilot control oil of the first pilot oil circuit X1 simultaneously enters the pilot oil port a1 of the first multi-way directional control valve 2 and the pilot oil port a2 of the second multi-way directional control valve 7, and the first multi-way directional control valve 2 and the second multi-way directional control valve 7 are commutated. At the same time, since the hydraulic oil of the first pilot oil circuit X1 flows into the sixth pilot oil circuit X6, the first inlet of the shuttle valve 605 is communicated with the outlet, and the pilot control oil of the sixth pilot oil circuit X6 simultaneously enters the pilot oil port a3 of the first hydraulic control directional control sub-valve 601 and the pilot oil port a4 of the second hydraulic control directional control sub-valve 602, and the first hydraulic control directional control sub-valve 601 and the second hydraulic control directional control sub-valve 602 are commutated. The hydraulic oil output by the first hydraulic pump 3 passes through the first multi-way directional control valve 2 and merges with the hydraulic oil output by the second hydraulic pump 9 passing through the second multi-way directional control valve 7, and then enters port A of the first motor 1. The hydraulic oil coming out from port B of the first motor 1 returns to the fuel tank through the first multi-way directional control valve 2 and the second multi-way directional control valve 7 respectively, completing the lowering action and providing downward pressure during the process of the power head drilling down.

[0047] When the power head of the rotary drilling rig in this embodiment performs rapid pulling: the second solenoid valve 8 and the fifth solenoid valve 606 are energized. After the second solenoid valve 8 and the fifth solenoid valve 606 are energized, the pilot control oil of the second pilot oil circuit X2 simultaneously enters the pilot oil port b1 of the first multi-way directional control valve 2 and the pilot oil port b2 of the second multi-way directional control valve 7, and the first multi-way directional control valve 2 and the second multi-way directional control valve 7 change their positions. At the same time, since the hydraulic oil of the second pilot oil circuit X2 flows into the sixth pilot oil circuit X6, the second oil inlet of the shuttle valve 605 is communicated with the oil outlet, and the pilot control oil of the sixth pilot oil circuit X6 simultaneously enters the pilot oil port a3 of the first hydraulic control multi-way valve 601 and the pilot oil port a4 of the second hydraulic control multi-way valve 602, and the first hydraulic control multi-way valve 601 and the second hydraulic control multi-way valve 602 change their positions. The hydraulic oil output by the first hydraulic pump 3 passes through the first multi-way directional control valve 2 and merges with the hydraulic oil output by the second hydraulic pump 9 passing through the second multi-way directional control valve 7, and then enters the B port of the first motor 1. The hydraulic oil flowing out from the A port of the first motor 1 returns to the fuel tank through the first multi-way directional control valve 2 and the second multi-way directional control valve 7 respectively, completing the rapid lifting action.

[0048] In the description of this solution, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this solution.

[0049] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this solution, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0050] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0051] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydraulic control system for rapid pressurization and extraction of the power head of a rotary drilling rig, comprising a first hydraulic pump (3), a first multi-way directional control valve (2) and a first motor (1) connected through pipelines, and a second hydraulic pump (9), a second multi-way directional control valve (7) and a second motor (5) connected through pipelines, characterized in that, The pilot oil port a1 of the first multi-way directional control valve (2) and the pilot oil port a2 of the second multi-way directional control valve (7) are connected through a first pilot oil circuit X1, and the pilot oil port b1 of the first multi-way directional control valve (2) and the pilot oil port b2 of the second multi-way directional control valve (7) are connected through a second pilot oil circuit X2; A first solenoid valve (4) is provided on the first pilot oil circuit X1, a second solenoid valve (8) is provided on the second pilot oil circuit X2, and a switching valve (6) is provided between the second multi-way directional control valve (7) and the second motor (5). When the switching valve (6) is switched to the first position, the oil port of the switching valve (6) is connected to the first motor (1) through a pipeline. When the switching valve (6) is switched to the second position, the oil port of the switching valve (6) is connected to the second motor (5) through a pipeline; A relief valve is provided between the A port and the B port of the first motor (1).

2. The quick pressurization and extraction hydraulic control system for the power head of a rotary drilling rig according to claim 1, characterized in that, The switching valve (6) includes a first hydraulically controlled directional control sub-valve (601), a second hydraulically controlled directional control sub-valve (602) and a third solenoid valve (603). The third solenoid valve (603) is used to control a third pilot oil circuit X3, and the third pilot oil circuit X3 is connected to the pilot oil port a3 of the first hydraulically controlled directional control sub-valve (601) and the pilot oil port a4 of the second hydraulically controlled directional control sub-valve (602).

3. The quick pressurization and pulling hydraulic control system for the power head of a rotary drilling rig according to claim 2, characterized in that, The P3 port of the first hydraulically controlled directional control sub-valve (601) is connected to the A2 port of the second multi-way directional control valve (7), the P4 port of the second hydraulically controlled directional control sub-valve (602) is connected to the B2 port of the second multi-way directional control valve (7), and the T3 port of the first hydraulically controlled directional control sub-valve (601) and the T4 port of the second hydraulically controlled directional control sub-valve (602) are both connected to the oil tank.

4. The quick pressurization and pulling hydraulic control system for the power head of a rotary drilling rig according to claim 2, wherein, The A3 port of the first hydraulically controlled directional control sub-valve (601) is connected to the connecting pipeline of the A1 port of the first multi-way directional control valve (2), and the A4 port of the second hydraulically controlled directional control sub-valve (602) is connected to the connecting pipeline of the B1 port of the first multi-way directional control valve (2); The B3 port of the first hydraulically controlled directional control sub-valve (601) is connected to the A port of the second motor (5), and the B4 port of the second hydraulically controlled directional control sub-valve (602) is connected to the B port of the second motor (5).

5. The quick pressurization and pulling hydraulic control system for the power head of a rotary drilling rig according to claim 2, wherein When the third solenoid valve (603) is energized, the switching valve (6) is switched to the first position, the second hydraulic pump (9) provides hydraulic oil for the first motor (1), and the second hydraulic pump (9) and the first hydraulic pump (3) simultaneously provide hydraulic oil for the pressurizing circuit. When the third solenoid valve (603) is de-energized, the switching valve (6) returns to the second position, the second hydraulic pump (9) provides hydraulic oil for the second motor (5), and the second hydraulic pump (9) provides hydraulic oil for the auxiliary hoist circuit.

6. The quick pressurization and extraction hydraulic control system for the power head of a rotary drilling rig according to claim 1, characterized in that, It also includes an auxiliary hoist pilot lift oil circuit X4 and an auxiliary hoist pilot lower oil circuit X5; the auxiliary hoist pilot lift oil circuit X4 is connected to the second multi-way directional control valve (7) through the first solenoid valve (4), and the auxiliary hoist pilot lower oil circuit X5 is connected to the second multi-way directional control valve (7) through the second solenoid valve (8); When the first solenoid valve (4) is energized, the first pilot oil passage X1 communicates with the pilot oil port a2 of the second multi-way directional control valve (7). When the first solenoid valve (4) is de-energized, the auxiliary hoist pilot lift oil passage X4 communicates with the pilot oil port a2 of the second multi-way directional control valve (7). When the second solenoid valve (8) is energized, the second pilot oil passage X2 communicates with the pilot oil port b2 of the second multi-way directional control valve (7). When the second solenoid valve (8) is de-energized, the auxiliary hoist pilot lower oil passage X5 communicates with the pilot oil port b2 of the second multi-way directional control valve (7).

7. The quick pressurization and pulling hydraulic control system for the power head of a rotary drilling rig according to claim 1, characterized in that, The switching valve (6) includes a first hydraulically controlled directional control sub-valve (601), a second hydraulically controlled directional control sub-valve (602), a fourth solenoid valve (604), a fifth solenoid valve (606) and a shuttle valve (605). The fourth solenoid valve (604) is connected to the first pilot oil passage X1, the fifth solenoid valve (606) is connected to the second pilot oil passage X2, and the first pilot oil passage X1 and the second pilot oil passage X2 are communicated through a sixth pilot oil passage X6. The connection position between the first pilot oil passage X1 and the sixth pilot oil passage X6 is arranged between the fourth solenoid valve (604) and the first solenoid valve (4), and the connection position between the second pilot oil passage X2 and the sixth pilot oil passage X6 is arranged between the fifth solenoid valve (606) and the second solenoid valve (8). A shuttle valve (605) is arranged on the sixth pilot oil passage X6, and the pilot oil ports of the first hydraulically controlled directional control sub-valve (601) and the second hydraulically controlled directional control sub-valve (602) are communicated with the oil outlet of the shuttle valve (605).

8. The quick pressurization and pulling hydraulic control system for the power head of a rotary drilling rig according to claim 7, characterized in that, The first oil inlet of the shuttle valve (605) communicates with the first pilot oil passage X1, and the second oil inlet of the shuttle valve (605) communicates with the second pilot oil passage X2.

Images