Hydraulic system based on CFA working condition, operation method of hydraulic system and rotary drilling rig

Abstract

The invention provides a hydraulic system based on a CFA working condition and an operation method thereof.The hydraulic system comprises a pilot pump, a control valve, a first electromagnetic reversing valve, a second electromagnetic reversing valve, a first hydraulic control proportional valve and a second hydraulic control proportional valve; the other end of the control valve is connected with a first electromagnetic directional valve and a second electromagnetic directional valve, the first electromagnetic directional valve is connected with a first hydraulic control proportional valve through a first pipeline, and the second electromagnetic directional valve is connected with a second hydraulic control proportional valve through a second pipeline. The first pipeline and the second pipeline are respectively communicated with the control valve, and pilot oil passing through the control valve can simultaneously control the first hydraulic control proportional valve and the second hydraulic control proportional valve. The hydraulic system is simple in program, the drill rod and the power head can synchronously ascend through a common hydraulic valve, feedback control is prevented from being added, the hydraulic system is simple and reliable, and the operation difficulty is reduced. The invention further relates to the rotary drilling rig.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation construction equipment, and in particular to a hydraulic system based on a CFA working condition, an operating method thereof, and a rotary drilling rig. Background Art

[0002] When the existing rotary drilling rig is carrying out the CFA process (long spiral bored pile construction process), the drill rod and the power head are connected together and need to move synchronously. Therefore, displacement sensors and speed sensors are usually installed to detect the displacement and speed of the main winch and the power head. At the same time, a large-flow electric-controlled proportional valve is used, and the synchronization of the drill rod and the power head is controlled by a program. The large-flow electric-controlled proportional valve is controlled by input current to control the displacement of the pump, and the flow is adjusted in real time to match the speed and position of the drill rod and the power head. When the power head rises, the drill rod winch motor floats, and the inlet and outlet of the drill rod winch motor are interconnected, so that the drill rod winch motor can rotate automatically. Therefore, when the power head rises, it can drive the drill rod to rise. The above rotary drilling rig has the following disadvantages: (1) The additional displacement sensor, speed sensor and large flow electronic proportional valve need to be synchronized through program control, which is complex and requires high reliability of components. Therefore, they are greatly affected by the performance of the displacement sensor, speed sensor and large flow electronic proportional valve; (2) The power head drives the drill rod to rise, and the drill rod winch motor is forced to rotate, which will generate a lot of heat, causing the system to heat up and affecting the life of the drill rod winch motor. In addition, since the power head adds additional load, some models need to increase the specifications of the power head winch components, that is, increase the pump valve motor. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a hydraulic system based on CFA working conditions. The hydraulic system has a simple program and can make the drill rod and the power head rise synchronously through an ordinary hydraulic valve, avoiding the addition of feedback control. It is simple and reliable and reduces the difficulty of operation.

[0004] The present invention provides a hydraulic system based on CFA working conditions, including a pilot pump, a control valve, a first electromagnetic reversing valve, a second electromagnetic reversing valve, a first hydraulically controlled proportional valve and a second hydraulically controlled proportional valve, one end of the control valve is connected to the pilot pump, and the other end of the control valve is respectively connected to the first electromagnetic reversing valve and the second electromagnetic reversing valve, the first electromagnetic reversing valve is connected to the first hydraulically controlled proportional valve through a first pipeline, the first hydraulically controlled proportional valve is used to control the forward and reverse rotation of a drill rod hoisting motor, the second electromagnetic reversing valve is connected to the second hydraulically controlled proportional valve through a second pipeline, the second hydraulically controlled proportional valve is used to control the forward and reverse rotation of a power head hoisting motor, when the first electromagnetic reversing valve and the second electromagnetic reversing valve are respectively energized, the first pipeline and the second pipeline are respectively connected to the control valve, and the pilot oil passing through the control valve can simultaneously control the first hydraulically controlled proportional valve and the second hydraulically controlled proportional valve to achieve synchronous opening of the drill rod hoisting motor and the power head hoisting motor.

[0005] In one embodiment, the hydraulic system includes a first oil circuit, a second oil circuit, a third oil circuit, a fourth oil circuit and a fifth oil circuit. The first oil circuit and the second oil circuit are respectively connected between the drill rod hoisting motor and the first hydraulically controlled proportional valve. When oil flows into the first oil circuit, the drill rod hoisting motor controls the drill rod to rise; the third oil circuit and the fourth oil circuit are respectively connected between the power head hoisting motor and the second hydraulically controlled proportional valve. When oil flows into the third oil circuit, the power head hoisting motor controls the power head to rise. The fifth oil circuit is connected between the first oil circuit and the third oil circuit. A switch valve is provided on the fifth oil circuit for connecting or disconnecting the first oil circuit and the third oil circuit.

[0006] In one embodiment, the control valve is an electric proportional pressure reducing valve or a proportional relief valve.

[0007] In one embodiment, the hydraulic system further includes a controller and an operating handle, wherein the operating handle is electrically connected to the controller, and the controller is electrically connected to the control valve. When the operating handle is operated, the controller sends a signal to the control valve, so that the control valve can simultaneously control the first hydraulically controlled proportional valve and the second hydraulically controlled proportional valve.

[0008] In one embodiment, the hydraulic system further includes a controller and an operation panel, wherein the operation panel is electrically connected to the controller, and the controller is electrically connected to the control valve. The operation panel is provided with a one-touch pull-out button and a speed adjustment button, and the one-touch pull-out button enables the controller to send a signal to the control valve so that the control valve can simultaneously control the first hydraulically controlled proportional valve and the second hydraulically controlled proportional valve; the speed adjustment button can control the output pressure of the control valve to control the opening of the first hydraulically controlled proportional valve and the second hydraulically controlled proportional valve, thereby controlling the rising speed of the drill rod and the power head.

[0009] In one embodiment, the hydraulic system also includes a third solenoid reversing valve connected to the pilot pump, the third solenoid reversing valve is connected to the first hydraulically controlled proportional valve through a third pipeline, and the third solenoid reversing valve is connected to the first solenoid reversing valve through a fourth pipeline. When the first solenoid reversing valve, the second solenoid reversing valve and the control valve are respectively powered off and the third solenoid reversing valve is in a neutral position, the first pipeline is connected to the fourth pipeline, the first oil circuit and the second oil circuit are respectively connected to the first oil tank, the third pipeline and the fourth pipeline are respectively connected to the second oil tank, and the drill rod winch motor is in a pressure relief state and remains stationary.

[0010] In one embodiment, the hydraulic system also includes a fourth solenoid reversing valve connected to the pilot pump, the fourth solenoid reversing valve is connected to the second hydraulically controlled proportional valve through a fifth pipeline, and the fourth solenoid reversing valve is connected to the second solenoid reversing valve through a sixth pipeline. When the first solenoid reversing valve, the second solenoid reversing valve and the control valve are respectively powered off and the fourth solenoid reversing valve is in a neutral position, the second pipeline is connected to the sixth pipeline, the third oil circuit and the fourth oil circuit are respectively connected to the fourth oil tank, the fifth pipeline and the sixth pipeline are respectively connected to the third oil tank, and the power head winch motor is in a pressure relief state and remains stationary.

[0011] In one embodiment, when the control valve, the first electromagnetic reversing valve, the second electromagnetic reversing valve and the switch valve are respectively powered off, the drill rod hoisting motor and the power head hoisting motor work independently.

[0012] The present invention also relates to a control method for the above-mentioned hydraulic system based on the CFA working condition, characterized in that the control method includes: energizing the first solenoid reversing valve and the second solenoid reversing valve respectively, the first pipeline is connected to the control valve through the first solenoid reversing valve, and the second pipeline is connected to the control valve through the second solenoid reversing valve; operating the one-touch pull-out button on the operating handle or the operating panel, the controller sends a signal to the control valve, and the control valve simultaneously controls the opening of the first hydraulically controlled proportional valve and the second hydraulically controlled proportional valve; controlling the switch valve to be energized, the first oil circuit and the third oil circuit are connected, so that the pressure of the first oil circuit is the same as the pressure of the third oil circuit, so as to achieve speed synchronization of the drill rod and the power head.

[0013] The present invention also relates to a rotary drilling rig, comprising the above-mentioned hydraulic system based on the CFA working condition.

[0014] The hydraulic system of the present invention detects the pilot pressure and uses the control valve to control the first hydraulic proportional valve and the second hydraulic proportional valve to realize the simultaneous opening of the drill rod winch motor and the power head winch motor. The first oil circuit and the third oil circuit are made the same by the switch valve, so that the rising speed of the drill rod and the rising speed of the power head are the same. In this embodiment, all hydraulic components are ordinary hydraulic valves with simple and reliable structure and simple procedures, which avoids adding feedback control and reduces the difficulty of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a control principle diagram of a control valve in a hydraulic system of the present invention.

[0017] Figure 2 It is a control principle diagram of powering up the control valve in the hydraulic system of the present invention.

[0018] Figure 3 It is a structural schematic diagram of a control panel of the present invention.

[0019] Description of the reference numerals: pilot pump 111; drill pipe hoist motor 112; power head hoist motor 113; first electromagnetic reversing valve 121; second electromagnetic reversing valve 122; first hydraulically controlled proportional valve 123; second hydraulically controlled proportional valve 124; third electromagnetic reversing valve 125; fourth electromagnetic reversing valve 126; control valve 127; switch valve 128; first pipeline 131; second pipeline 132; third pipeline 133; 33; fourth pipeline-134; fifth pipeline-135; sixth pipeline-136; first oil circuit-141; second oil circuit-142; third oil circuit-143; fourth oil circuit-144; fifth oil circuit-145; first oil tank-151; second oil tank-152; third oil tank-153; fourth oil tank-154; fifth oil tank-155; control panel-16; one-touch pull-out button-161; speed adjustment button-162.

[0020] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the description 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.

[0022] In the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0023] The directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front”, “back”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0024] The terms "first", "second", "third", etc. are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0025] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0026] like Figure 1 and Figure 2 As shown, the hydraulic system based on the CFA working condition can adapt to both the CAF working condition and the conventional working condition. The hydraulic system includes a pilot pump 111, a control valve 127, a first electromagnetic reversing valve 121, a second electromagnetic reversing valve 122, a first hydraulically controlled proportional valve 123, and a second hydraulically controlled proportional valve 124. One end of the control valve 127 is connected to the pilot pump 111, and the other end of the control valve 127 is connected to the first electromagnetic reversing valve 121 and the second electromagnetic reversing valve 122 respectively. The first electromagnetic reversing valve 121 is connected to the first hydraulically controlled proportional valve 123 through a first pipeline 131. The first hydraulically controlled proportional valve 123 is used to control the forward and reverse rotation of the drill pipe hoist motor 112. The second electromagnetic reversing valve 122 is connected to the second hydraulically controlled proportional valve 123 through a second pipeline 132. The first hydraulic proportional valve 123, the second hydraulic proportional valve 124, and the second hydraulic proportional valve 124 are used to control the forward and reverse rotation of the power head winch motor 113. When the first electromagnetic reversing valve 121 and the second electromagnetic reversing valve 122 are energized, the first pipeline 131 and the second pipeline 132 are connected to the control valve 127 respectively. The pilot oil passing through the control valve 127 can simultaneously control the first hydraulic proportional valve 123 and the second hydraulic proportional valve 124 to achieve synchronous opening of the drill rod winch motor 112 and the power head winch motor 113, and the drill rod winch motor 112 can control the rise and fall of the drill rod, and the power head winch motor 113 can control the rise and fall of the power head. Therefore, the synchronous rise of the drill rod and the power head can be achieved through the control valve 127. The first hydraulic proportional valve 123, the second hydraulic proportional valve 124 and the control valve 127 in this embodiment are all ordinary hydraulic valves.

[0027] Preferably, the control valve 127 is an electric proportional pressure reducing valve or a proportional relief valve. When the control valve 127 is an electric proportional pressure reducing valve, the electric proportional pressure reducing valve includes a first oil port, a second oil port and a third oil port. The pilot oil of the pilot pump 111 enters the electric proportional pressure reducing valve through the second oil port at a constant pressure. The electric proportional pressure reducing valve reduces the pressure of the pilot oil and then outputs it to the first solenoid reversing valve 121 and the second solenoid reversing valve 122 through the first oil port. The hydraulic system also includes a fifth oil tank 155, which is connected to the third oil port. When the electric proportional pressure reducing valve is not working, the first oil port is connected to the third oil port, and the pressure of the electric proportional pressure reducing valve is 0. When the control valve 127 is a proportional relief valve, its function is the same as that of the electric proportional pressure reducing valve. The output pressure of the proportional relief valve is set. When the pressure of the pilot oil is greater than the set output pressure, part of the pilot oil flows to the fifth oil tank 155 through the third oil port, and the first oil port outputs oil at the set output pressure.

[0028] Preferably, the hydraulic system includes a first oil circuit 141, a second oil circuit 142, a third oil circuit 143, a fourth oil circuit 144 and a fifth oil circuit 145. The first oil circuit 141 and the second oil circuit 142 are respectively connected between the drill rod hoisting motor 112 and the first hydraulic proportional valve 123. When the first oil circuit 141 is filled with oil, the drill rod hoisting motor 112 controls the drill rod to rise. When the second oil circuit 142 is filled with oil, the drill rod hoisting motor 112 controls the drill rod to fall. The third oil circuit 143 and the fourth oil circuit 144 are respectively connected between the power head hoisting motor 113 and the second hydraulic proportional valve 124. When the third oil circuit 143 is filled with oil, the power head hoisting motor 113 controls the power head to rise. When the fourth oil circuit 144 is filled with oil, the power head hoisting motor 113 controls The braking head is lowered; under the CFA working condition, although the control valve 127 can simultaneously control the synchronous opening of the first hydraulic proportional valve 123 and the second hydraulic proportional valve 124, due to the difference in actuators and loads, there will be a speed difference between the rise of the drill pipe and the rise of the power head. Therefore, the fifth oil circuit 145 is connected between the first oil circuit 141 and the third oil circuit 143. The fifth oil circuit 145 is provided with a switch valve 128, which is used to connect or disconnect the first oil circuit 141 and the third oil circuit 143. When the switch valve 128 is energized, the first oil circuit 141 and the third oil circuit 143 are connected. According to the Pascal principle, the pressure of the first oil circuit 141 is the same as the pressure of the third oil circuit 143, so as to achieve the synchronization of the rising speed of the drill pipe and the power head. Among them, the switch valve 128 can also be replaced by a two-position four-way valve, which has the same function as the switch valve 128 and is used to connect or disconnect the first oil circuit 141 and the third oil circuit 143.

[0029] Preferably, the hydraulic system also includes a controller and an operating handle, the operating handle is electrically connected to the controller, and the controller is electrically connected to the control valve 127. When the operating handle is operated to raise the drill rod, the controller sends a signal to the control valve 127, so that the control valve 127 can simultaneously control the first hydraulically controlled proportional valve 123 and the second hydraulically controlled proportional valve 124.

[0030] like Figure 3As shown, the hydraulic system also includes a controller and an operation panel 16. The operation panel 16 is electrically connected to the controller, and the controller is electrically connected to the control valve 127. The operation panel 16 is provided with a one-touch pull-up button 161 and a speed adjustment button 162. The one-touch pull-up button 161 causes the controller to send a signal to the control valve 127, so that the control valve 127 can simultaneously control the first hydraulic proportional valve 123 and the second hydraulic proportional valve 124. When the one-touch pull-up function is used, there is no need to operate the operating handle. Only the one-touch pull-up button 161 needs to be clicked on the operation panel 16 to output a signal to the control valve 127, so as to simultaneously control the rise of the drill rod and the power head, thereby simplifying the operation and reducing the difficulty of operation. The output pressure of the control valve 127 can be controlled by the speed adjustment button 162 to control the opening of the first hydraulic proportional valve 123 and the second hydraulic proportional valve 124, thereby controlling the rise speed of the drill rod and the power head.

[0031] Preferably, under normal operating conditions, Figure 1 As shown, the control valve 127, the first electromagnetic reversing valve 121, the second electromagnetic reversing valve 122 and the switch valve 128 are not energized, and the drill pipe hoisting motor 112 and the power head hoisting motor 113 work independently.

[0032] Preferably, the hydraulic system also includes a third solenoid reversing valve 125 connected to the pilot pump 111, the third solenoid reversing valve 125 is connected to the first hydraulically controlled proportional valve 123 through a third pipeline 133, and the third solenoid reversing valve 125 is connected to the first solenoid reversing valve 121 through a fourth pipeline 134. When the first solenoid reversing valve 121, the second solenoid reversing valve 122 and the control valve 127 are respectively powered off, and the third solenoid reversing valve 125 is in the middle position, the first pipeline 131 is connected to the fourth pipeline 134, the first oil circuit 141 and the second oil circuit 142 are respectively connected to the first oil tank 151, the third pipeline 133 and the fourth pipeline 134 are respectively connected to the second oil tank 152, the drill rod winch motor 112 is in a pressure relief state and remains stationary, and at this time the fourth solenoid reversing valve 126 is not powered on in the middle position.

[0033] Preferably, the hydraulic system also includes a fourth solenoid reversing valve 126 connected to the pilot pump 111, the fourth solenoid reversing valve 126 is connected to the second hydraulically controlled proportional valve 124 through a fifth pipeline 135, and the fourth solenoid reversing valve 126 is connected to the second solenoid reversing valve 122 through a sixth pipeline 136. When the first solenoid reversing valve 121, the second solenoid reversing valve 122 and the control valve 127 are respectively powered off, and the fourth solenoid reversing valve 126 is in the middle position, the second pipeline 132 is connected to the sixth pipeline 136, the third oil circuit 143 and the fourth oil circuit 144 are respectively connected to the fourth oil tank 154, the fifth pipeline 135 and the sixth pipeline 136 are respectively connected to the third oil tank 153, and the power head winch motor 113 is in a pressure relief state and remains stationary. At this time, the third solenoid reversing valve 125 is not powered on in the middle position.

[0034] The present invention also relates to a control method for the above-mentioned hydraulic system based on the CFA working condition, the control method comprising: The first electromagnetic reversing valve 121 and the second electromagnetic reversing valve 122 are energized respectively, the first pipeline 131 is connected to the control valve 127 through the first electromagnetic reversing valve 121, and the second pipeline 132 is connected to the control valve 127 through the second electromagnetic reversing valve 122; The one-touch extraction button 161 of the operating handle or the operating panel 16 is operated, and the controller sends a signal to the control valve 127, and the control valve 127 controls the opening of the first hydraulically controlled proportional valve 123 and the second hydraulically controlled proportional valve 124 at the same time; The control switch valve 128 is energized, the first oil circuit 141 and the third oil circuit 143 are connected, and the pressure of the first oil circuit 141 and the pressure of the third oil circuit 143 are made the same by using Pascal's principle to achieve synchronization of the rising speeds of the drill pipe and the power head.

[0035] The present invention also relates to a rotary drilling rig, comprising the above-mentioned hydraulic system based on the CFA working condition.

[0036] The hydraulic system of the present invention detects the pilot pressure and uses the control valve 127 to control the first hydraulic proportional valve 123 and the second hydraulic proportional valve 124 to realize the simultaneous opening of the drill rod hoisting motor 112 and the power head hoisting motor 113. The first oil circuit 141 and the third oil circuit 143 are made the same through the switch valve 128, so that the rising speed of the drill rod and the rising speed of the power head are the same. In this embodiment, all hydraulic components are ordinary hydraulic valves with simple and reliable structure and simple procedures, which avoids adding feedback control and reduces the difficulty of operation.

[0037] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A hydraulic system based on CFA working condition, characterized in that: The invention comprises a pilot pump (111), a control valve (127), a first electromagnetic reversing valve (121), a second electromagnetic reversing valve (122), a first hydraulically controlled proportional valve (123) and a second hydraulically controlled proportional valve (124), wherein one end of the control valve (127) is connected to the pilot pump (111), and the other end of the control valve (127) is connected to the first electromagnetic reversing valve (121) and the second electromagnetic reversing valve (122), respectively; the first electromagnetic reversing valve (121) is connected to the first hydraulically controlled proportional valve (123) through a first pipeline (131); the first hydraulically controlled proportional valve (123) is used to control the forward and reverse rotation of the drill pipe hoist motor (112); the second electromagnetic reversing valve (124) is used to control the forward and reverse rotation of the drill pipe hoist motor (112); and the second hydraulically controlled proportional valve (124) is used to control the forward and reverse rotation of the drill pipe hoist motor (112). The valve (122) is connected to the second hydraulically controlled proportional valve (124) through a second pipeline (132). The second hydraulically controlled proportional valve (124) is used to control the forward and reverse rotation of the power head hoisting motor (113). When the first electromagnetic reversing valve (121) and the second electromagnetic reversing valve (122) are respectively energized, the first pipeline (131) and the second pipeline (132) are respectively connected to the control valve (127). The pilot oil passing through the control valve (127) can simultaneously control the first hydraulically controlled proportional valve (123) and the second hydraulically controlled proportional valve (124), so as to achieve synchronous opening of the drill rod hoisting motor (112) and the power head hoisting motor (113).

2. The hydraulic system based on CFA working condition according to claim 1, characterized in that: The hydraulic system comprises a first oil circuit (141), a second oil circuit (142), a third oil circuit (143), a fourth oil circuit (144) and a fifth oil circuit (145). The first oil circuit (141) and the second oil circuit (142) are respectively connected between the drill rod hoisting motor (112) and the first hydraulically controlled proportional valve (123). When oil flows into the first oil circuit (141), the drill rod hoisting motor (112) controls the drill rod to rise. The third oil circuit (143) and the fourth oil circuit ( 144) are respectively connected between the power head hoisting motor (113) and the second hydraulic proportional valve (124). When oil is fed into the third oil circuit (143), the power head hoisting motor (113) controls the power head to rise. The fifth oil circuit (145) is connected between the first oil circuit (141) and the third oil circuit (143). A switch valve (128) is provided on the fifth oil circuit (145) for connecting or disconnecting the first oil circuit (141) and the third oil circuit (143).

3. The hydraulic system based on CFA working condition according to claim 1, characterized in that: The control valve (127) is an electric proportional pressure reducing valve or a proportional overflow valve.

4. The hydraulic system based on CFA working condition according to claim 2, characterized in that: The hydraulic system further comprises a controller and an operating handle, wherein the operating handle is electrically connected to the controller, and the controller is electrically connected to the control valve (127). When the operating handle is operated, the controller sends a signal to the control valve (127), so that the control valve (127) can simultaneously control the first hydraulically controlled proportional valve (123) and the second hydraulically controlled proportional valve (124).

5. The hydraulic system based on CFA working condition according to claim 2, characterized in that: The hydraulic system further comprises a controller and an operation panel (16), wherein the operation panel (16) is electrically connected to the controller, and the controller is electrically connected to the control valve (127), and the operation panel (16) is provided with a one-touch pull-out button (161) and a speed adjustment button (162), wherein the one-touch pull-out button (161) causes the controller to send a signal to the control valve (127), so that the control valve (127) can simultaneously control the first hydraulically controlled proportional valve (123) and the second hydraulically controlled proportional valve (124); The output pressure of the control valve (127) can be controlled by the speed adjustment button (162) to control the opening of the first hydraulically controlled proportional valve (123) and the second hydraulically controlled proportional valve (124), thereby controlling the rising speed of the drill rod and the power head.

6. The hydraulic system based on CFA working condition according to claim 2, characterized in that: The hydraulic system further includes a third electromagnetic reversing valve (125) connected to the pilot pump (111). The third electromagnetic reversing valve (125) is connected to the first hydraulic proportional valve (123) through a third pipeline (133). The third electromagnetic reversing valve (125) is connected to the first electromagnetic reversing valve (121) through a fourth pipeline (134). When the first electromagnetic reversing valve (121), the second electromagnetic reversing valve (122) and the control valve (127) are respectively de-energized and the third electromagnetic reversing valve (125) is in a neutral position, the first pipeline (131) is connected to the fourth pipeline (134), the first oil circuit (141) and the second oil circuit (142) are respectively connected to the first oil tank (151), the third pipeline (133) and the fourth pipeline (134) are respectively connected to the second oil tank (152), and the drill pipe hoist motor (112) is in a pressure relief state and remains stationary.

7. The hydraulic system based on CFA working condition according to claim 2, characterized in that: The hydraulic system also includes a fourth electromagnetic reversing valve (126) connected to the pilot pump (111), the fourth electromagnetic reversing valve (126) is connected to the second hydraulic proportional valve (124) through a fifth pipeline (135), and the fourth electromagnetic reversing valve (126) is connected to the second electromagnetic reversing valve (122) through a sixth pipeline (136). When the first electromagnetic reversing valve (121), the second electromagnetic reversing valve (122) and the control valve (127) are respectively de-energized and the fourth electromagnetic reversing valve (126) is in a neutral position, the second pipeline (132) is connected to the sixth pipeline (136), the third oil circuit (143) and the fourth oil circuit (144) are respectively connected to the fourth oil tank (154), the fifth pipeline (135) and the sixth pipeline (136) are respectively connected to the third oil tank (153), and the power head winch motor (113) is in a pressure relief state and remains stationary.

8. The hydraulic system based on CFA working condition according to claim 6 or 7, characterized in that: When the control valve (127), the first electromagnetic reversing valve (121), the second electromagnetic reversing valve (122) and the switch valve (128) are not powered, the drill rod hoisting motor (112) and the power head hoisting motor (113) work independently.

9. A control method for a hydraulic system based on a CFA working condition according to any one of claims 1 to 8, characterized in that: The control method includes: The first electromagnetic reversing valve (121) and the second electromagnetic reversing valve (122) are respectively energized, the first pipeline (131) is communicated with the control valve (127) through the first electromagnetic reversing valve (121), and the second pipeline (132) is communicated with the control valve (127) through the second electromagnetic reversing valve (122); By operating the one-touch extraction button (161) on the operating handle or the operating panel (16), the controller sends a signal to the control valve (127), and the control valve (127) simultaneously controls the opening of the first hydraulically controlled proportional valve (123) and the second hydraulically controlled proportional valve (124); The control switch valve (128) is energized, and the first oil circuit (141) and the third oil circuit (143) are connected, so that the pressure of the first oil circuit (141) and the pressure of the third oil circuit (143) are the same, so as to achieve speed synchronization between the drill pipe and the power head.

10. A rotary drilling rig, characterized in that: A hydraulic system based on the CFA working condition comprising any one of claims 1 to 8.

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