Rotary drilling rig power head system and control method therefor, and rotary drilling rig

Abstract

A rotary drilling rig power head system, comprising: a power head case (8); a first power assembly comprising a motor (5), a clutch (6), and a first on-off valve (3), wherein the motor is in power connection with the power head case by means of the clutch, and the first on-off valve is connected to a control oil port of the clutch and used for controlling the on / off of the clutch; a second power assembly comprising a hydraulic motor (10), a floating solenoid valve (11), and a second on-off valve (12), wherein the hydraulic motor is in power connection with the power head case, the hydraulic motor has a first working oil port (A) and a second working oil port (B) which are connected by means of the floating solenoid valve, and the second on-off valve is connected to a displacement control oil port of the hydraulic motor and used for controlling the working pressure of the displacement control oil port; and a controller (2) used for controlling the working states of the first on-off valve, the second on-off valve, and the floating solenoid valve on the basis of the working requirements of the power head case, so that the power head case can selectively work in a first driving mode, a second driving mode, or a third driving mode. Further disclosed are a control method for the rotary drilling rig power head system, and a rotary drilling rig comprising the rotary drilling rig power head system.

Description

Power head system of rotary drilling rig, control method thereof and rotary drilling rig

[0001] Cross-reference to related applications

[0002] The present disclosure is based on and claims priority to Chinese application No. 202410591861.5, filed on May 13, 2024, the disclosure of which is hereby incorporated by reference in its entirety into the present disclosure. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of engineering machinery, and in particular to a power head system of a rotary drilling rig, a control method thereof and the rotary drilling rig. BACKGROUND

[0004] The rotary drilling rig is a pile construction type hole forming device, and the power head is a main working component thereof. When rotary drilling is performed, the power head rotates to drive the drill rod and drill tool to perform drilling and soil dumping.

[0005] With the progress of science and technology, engineering machinery is gradually electrified, and the power head gradually adopts a motor direct drive mode. When the rotary drilling rig is operated, the motor direct drive power head mode improves the drilling efficiency, but due to the large size and weight of the motor, the motor direct drive power head has poor soil throwing performance, which seriously affects the construction efficiency, especially in the construction of clayey strata, the construction efficiency is lower than that of the current hydraulic motor drive technology, which seriously affects the development of the rotary drilling rig electrification.

[0006] SUMMARY

[0007] The present disclosure provides a power head system of a rotary drilling rig, a control method thereof and the rotary drilling rig, which can make the construction of the rotary drilling rig safer and more efficient.

[0008] The first aspect of the present disclosure provides a power head system of a rotary drilling rig, comprising:

[0009] a power head box body;

[0010] a first power assembly comprising a motor, a clutch and a first on-off valve, the motor being power connected to the power head box body through the clutch, the first on-off valve being connected to a control oil port of the clutch and being configured to control the on-off of the clutch;

[0011] a second power assembly comprising a hydraulic motor, a floating solenoid valve and a second on-off valve, the hydraulic motor being power connected to the power head box body, the hydraulic motor having a first working oil port and a second working oil port, the first working oil port and the second working oil port being connected through the floating solenoid valve, the second on-off valve being in communication with a displacement control oil port of the hydraulic motor and being configured to control the working pressure of the displacement control oil port of the hydraulic motor; and

[0012] a controller configured to control working states of the first on-off valve, the second on-off valve and the floating solenoid valve according to working requirements of the power head box, so that the power head box is selectively operated in the first driving mode, the second driving mode or the third driving mode.

[0013] In some embodiments, the rotary drilling rig power head system further comprises a mode selection button configured to respond to external operation and send a signal to the controller to select the first driving mode, the second driving mode or the third driving mode; wherein in the first driving mode, the motor drives the power head box alone, in the second driving mode, the hydraulic motor drives the power head box alone, and in the third driving mode, the motor and the hydraulic motor drive the power head box synchronously.

[0014] In some embodiments, in the first driving mode, the first on-off valve is in the off state, the control oil port of the clutch has no pressure oil, and the clutch is in the connected state; the second on-off valve is in the on state, the floating solenoid valve is powered on, the first working oil port and the second working oil port are connected, and the hydraulic motor is in the floating state.

[0015] In some embodiments, in the second driving mode, the first on-off valve is in the on state, the control oil port of the clutch obtains pressure oil, and the clutch is in the disconnected state; the second on-off valve is in the off state, the floating solenoid valve is powered off, the first working oil port and the second working oil port are not connected, and the hydraulic motor is in the working state.

[0016] In some embodiments, in the third driving mode, the first on-off valve is in the off state, the control oil port of the clutch has no pressure oil, and the clutch is in the connected state; and the second on-off valve is in the off state, the floating solenoid valve is powered off, the first working oil port and the second working oil port are not connected, and the hydraulic motor is in the working state.

[0017] In some embodiments, the rotary drilling rig power head system further comprises:

[0018] a first pressure sensor configured to detect the pressure of the control oil port of the clutch;

[0019] wherein the controller is configured to determine whether the clutch is in the connected state or the disconnected state according to the detection value of the first pressure sensor.

[0020] In some embodiments, the rotary drilling rig power head system further comprises:

[0021] a second pressure sensor configured to detect the pressure of the displacement control oil port of the hydraulic motor;

[0022] wherein the controller is configured to determine whether the hydraulic motor is in the floating state or the working state according to the detection value of the second pressure sensor.

[0023] In some embodiments, the first power assembly further comprises a first speed reducer connected between the clutch and the power head box; and / or the second power assembly further comprises a second speed reducer connected between the hydraulic motor and the power head box.

[0024] The second aspect of the present disclosure provides a rotary drilling rig comprising the rotary drilling rig power head system of the above embodiments.

[0025] The third aspect of the present disclosure provides a control method of a rotary drilling rig power head system, comprising:

[0026] controlling the working states of the first on-off valve, the second on-off valve and the floating electromagnetic valve according to the working requirements of the power head box;

[0027] making the power head box work in the first driving mode, the second driving mode or the third driving mode selectively.

[0028] In some embodiments, the control method further comprises:

[0029] receiving the pressure of the clutch control oil port detected by the first pressure sensor;

[0030] determining whether the detection value of the first pressure sensor is less than the first threshold value, if yes, determining that the clutch is in the connected state, otherwise in the disconnected state; and / or

[0031] receiving the pressure of the hydraulic motor displacement control oil port detected by the second pressure sensor;

[0032] determining whether the detection value of the second pressure sensor is less than the second threshold value, if yes, determining that the hydraulic motor is in the working state, otherwise in the floating state.

[0033] The rotary drilling rig power head system of the embodiments of the present disclosure can control the working states of the first on-off valve, the second on-off valve and the floating electromagnetic valve according to the actual working requirements of the power head box, select the driving mode matching the working requirements, realize the safe switching of the driving mode, and make the construction of the rotary drilling rig power head more energy-saving and efficient. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0035] FIG. 1 is a schematic diagram of the module composition of some embodiments of the rotary drilling rig power head system of the present disclosure.

[0036] FIG. 2 is a flowchart of some embodiments of a control method for a power head system of a rotary drilling rig according to the present disclosure. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only some of the embodiments of the present disclosure, not all the embodiments. The following description of at least one exemplary embodiment is merely illustrative and in no way constitutes any limitation on the present disclosure and its applications or uses. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without carrying out creative work are within the scope of protection of the present disclosure.

[0038] Techniques, methods, and equipment known to those of ordinary skill in the relevant art can not be discussed in detail, but where appropriate, the techniques, methods, and equipment should be considered as part of the specification.

[0039] In the description of the present disclosure, it should be understood that the terms "center", "transverse", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular positional relationship.

[0040] As shown in FIG. 1, the present disclosure provides a rotary drilling rig power head system, the rotary drilling rig power head as the main working component of the rotary drilling rig, plays a key role in transmitting torque and pressurizing the drill rod. Among them, the power head system includes:

[0041] a power head box 8;

[0042] a first power assembly including a motor 5, a clutch 6, and a first on-off valve 3, the motor 5 being power connected to the power head box 8 through the clutch 6, the first on-off valve 3 being connected to the control oil port of the clutch 6 and being configured to control the on-off of the clutch 6;

[0043] a second power assembly including a hydraulic motor 10, a floating solenoid valve 11, and a second on-off valve 12, the hydraulic motor 10 being power connected to the power head box 8, the hydraulic motor 10 having a first working oil port A and a second working oil port B, the first working oil port A and the second working oil port B being connected through the floating solenoid valve 11, the second on-off valve 12 being in communication with the displacement control oil port of the hydraulic motor 10 and being configured to control the working pressure of the displacement control oil port of the hydraulic motor 10; and

[0044] The controller 2 is configured to control the working states of the first on-off valve 3, the second on-off valve 12 and the floating electromagnetic valve 11 according to the working requirements of the power head box 8, so that the power head box 8 can be selectively operated in the first driving mode, the second driving mode or the third driving mode.

[0045] The motor 5 has high driving efficiency, and is mechanically connected with the clutch 6. The clutch 6 is controlled to realize hydraulic connection and disconnection through the first on-off valve 3. When the control oil is connected, the clutch 6 is in the connected state, and the power of the motor 5 can be transmitted to the power head box 8 through the clutch 6. When the control oil is disconnected, the clutch 6 is in the disconnected state, and the transmission path of the power of the motor 5 to the power head box 8 is disconnected. For example, the first on-off valve 3 can be an electromagnetic valve. The first on-off valve 3 is connected with the control oil port of the clutch 6 through a hose joint.

[0046] The hydraulic motor 10 is used to realize hydraulic driving to achieve better soil throwing performance. For example, the second on-off valve 12 can be an electromagnetic valve, and the second electromagnetic valve 12 is connected with the displacement control oil port of the hydraulic motor 10 through a hose joint. The floating electromagnetic valve 11 and the second on-off valve 12 cooperate to realize whether the hydraulic motor 10 is in the working state. When the second on-off valve 12 is in the disconnected state (power off), and the floating electromagnetic valve 11 loses power, the displacement control oil port of the hydraulic motor 10 is not connected with the hydraulic oil, the first working oil port A and the second working oil port B are not connected, and the hydraulic motor 10 is in the working state. When the second on-off valve 12 is in the connected state (power on), and the floating electromagnetic valve 11 is powered, the displacement control oil port of the hydraulic motor 10 is connected with the hydraulic oil, the first working oil port A and the second working oil port B are connected, and the hydraulic motor 10 is in the floating state.

[0047] The motor 5 and the hydraulic motor 10 can also provide power at the same time to achieve greater working torque. The driving mode can be selected according to the requirements of driving efficiency, soil throwing performance and working torque.

[0048] The embodiment can control the working states of the first on-off valve 3, the second on-off valve 12 and the floating electromagnetic valve 11 according to the actual working requirements of the power head box 8, select the driving mode matched with the working requirements, realize safe switching of the driving mode, and make the construction of the rotary drilling rig power head more energy-saving and efficient.

[0049] In some embodiments, the rotary drilling rig power head system further comprises a mode selection button 1 configured to respond to external operation and send a signal to the controller 2 to select the first driving mode, the second driving mode or the third driving mode; wherein in the first driving mode, the motor 5 drives the power head box 8 alone, in the second driving mode, the hydraulic motor 10 drives the power head box 8 alone, and in the third driving mode, the motor 5 and the hydraulic motor 10 drive the power head box 8 synchronously.

[0050] Specifically, the first driving mode is selected when drilling in a general formation with normal hardness; the second driving mode is selected when rapid soil throwing is required; and the third driving mode is selected when drilling in a hard formation.

[0051] The mode selection button 1 is electrically connected to the controller 2 and can receive an operation of an operator to select different driving modes and send a corresponding driving mode signal to the controller, and the controller 2 controls the working states of the first on-off valve 3, the second on-off valve 12, and the floating electromagnetic valve 11.

[0052] This embodiment can enable the rotary drilling rig power head to be safely and quickly switched between the efficient motor driving, the hydraulic driving with better soil throwing performance, the synchronous driving of the motor and the hydraulic motor with large torque, and other power modes, so that the rotary drilling rig construction is more energy-efficient.

[0053] In some embodiments, in the first driving mode, the first on-off valve 3 is in the off state, the control oil port of the clutch 6 has no pressure oil, and the clutch 6 is in the engaged state; the second on-off valve 12 is in the on state, the floating electromagnetic valve 11 is powered, the first working oil port A and the second working oil port B are connected, and the hydraulic motor 10 is in the floating state.

[0054] This embodiment enables the clutch 6 to be in the engaged state, the power of the motor 5 to be transmitted to the power head box 8 through the clutch 6, and the hydraulic motor 10 to be in the floating state without providing torque output, so that the rotary drilling rig power head can work in the efficient motor driving mode, is suitable for the case where the working resistance of the power head is small, can directly convert electrical energy into mechanical energy, reduces the loss of intermediate energy conversion, the precise motor control can better meet the power demand of different working conditions, and realizes stepless speed regulation in a large range, thereby improving the construction efficiency of the rotary drilling rig.

[0055] In some embodiments, in the second driving mode, the first on-off valve 3 is in the on state, the control oil port of the clutch 6 obtains pressure oil, the clutch 6 is in the disengaged state; the second on-off valve 12 is in the off state, the floating electromagnetic valve 11 is de-energized, the first working oil port A and the second working oil port B are not connected, and the hydraulic motor 10 is in the working state.

[0056] This embodiment enables the clutch 6 to be in the disengaged state, disconnects the passage through which the power of the motor 5 is transmitted to the power head box 8 through the clutch 6, and enables the hydraulic motor 10 to be in the working state to provide torque output to the power head box 8, so that the rotary drilling rig power head can work in the hydraulic driving mode with better soil throwing performance, can provide large torque to help overcome large resistance when drilling and throwing soil, can effectively reduce manual operation during construction, reduce manual labor, and improve construction efficiency. In particular, in drilling construction and other operations that require a lot of time-consuming operations, the efficiency can be better reflected.

[0057] In some embodiments, in the third driving mode, the first on-off valve 3 is in the off state, the control oil port of the clutch 6 has no pressure oil, the clutch 6 is in the engaged state; and the second on-off valve 12 is in the off state, the floating solenoid valve 11 is de-energized, the first working oil port A and the second working oil port B are not connected, and the hydraulic motor 10 is in the working state.

[0058] This embodiment can make the clutch 6 in the engaged state, transmit the power of the motor 5 to the power head box 8 through the clutch 6, and make the hydraulic motor 10 in the working state to provide torque output to the power head box 8, so that greater working torque can be achieved through synchronous driving of the motor 5 and the hydraulic motor 10, the driving force of the power head of the rotary drilling rig is further improved, hard stratum drilling can be met, hard rock stratum can be broken more powerfully, drilling speed is improved, and greater depth drilling can be realized, sufficient power support is ensured when operating in a deeper hole, heavy load operation can be realized, such as in the case of complex geological conditions and greater resistance, the operation efficiency can still be maintained, in addition, fast construction requirements can be met, and some situations with high requirements for construction progress can be met, and construction efficiency is improved.

[0059] In some embodiments, the rotary drilling rig power head system further comprises a first pressure sensor 4 configured to detect the pressure of the control oil port of the clutch 6; and the controller 2 is configured to determine whether the clutch 6 is in the engaged state or the disengaged state according to the detection value of the first pressure sensor 4.

[0060] Specifically, the controller 2 is configured to determine whether the detection value of the first pressure sensor 4 is less than a first threshold value, if yes, it indicates that the control oil port of the clutch 6 has no control oil liquid, and it is determined that the clutch 6 is in the engaged state, otherwise, it indicates that the control oil port of the clutch 6 has control oil liquid, and it is determined that the clutch 6 is in the disengaged state. The first pressure sensor 4 is connected to the control oil port of the clutch 6 through a hose joint.

[0061] This embodiment can determine whether the first on-off valve 3 is in the correct working state through the detection value of the first pressure sensor 4 after the driving mode is selected and the working state of the first on-off valve 3 is controlled, so as to ensure that the driving state of the motor is consistent with the pre-selected driving mode.

[0062] In some embodiments, the rotary drilling rig power head system further comprises a second pressure sensor 13 configured to detect the pressure of the displacement control oil port of the hydraulic motor 10; and the controller 2 is configured to determine whether the hydraulic motor 10 is in the floating state or the working state according to the detection value of the second pressure sensor 13.

[0063] Specifically, the controller 2 is configured to determine whether the detection value of the second pressure sensor 13 is less than a second threshold value. If yes, it indicates that the displacement control oil port of the hydraulic motor 10 is not connected with the control oil, and it is determined that the clutch 6 is in the working state. Otherwise, it indicates that the displacement control oil port of the hydraulic motor 10 is connected with the control oil, and it is determined that the clutch 6 is in the floating state. The second pressure sensor 13 is connected with the displacement control oil port of the hydraulic motor 10 through a hose joint.

[0064] The embodiment can determine whether the second on-off valve 12 is in the correct working state through the detection value of the second pressure sensor 13 after the working state of the second on-off valve 12 is selected and controlled in the driving mode, so as to ensure that the driving state of the hydraulic motor 10 is consistent with the pre-selected driving mode.

[0065] In some embodiments, the first power assembly further comprises a first speed reducer 7 connected between the clutch 6 and the power head box 8, and the first speed reducer 7 is mechanically connected with the power head box 8; and / or the second power assembly further comprises a second speed reducer 9 connected between the hydraulic motor 10 and the power head box 8, and the hydraulic motor 10 is mechanically connected with the power head box 8 through the second speed reducer 9. The first speed reducer 7 can adjust the rotating speed of the motor 5 to the required rotating speed range of the power head through a first preset transmission ratio, and the second speed reducer 9 can adjust the rotating speed of the hydraulic motor 10 to the required rotating speed range of the power head through a second preset transmission ratio.

[0066] Secondly, the present disclosure provides a rotary drilling rig comprising the rotary drilling rig power head system of the above-mentioned embodiments.

[0067] The rotary drilling rig of the embodiment can flexibly select the matched driving mode according to the actual working requirement of the power head, and realize the safe switching of the driving mode, so as to make the construction of the rotary drilling rig more energy-efficient, and adapt to the requirements of different drilling conditions.

[0068] In addition, the present disclosure also provides a control method based on the rotary drilling rig power head system of the above-mentioned embodiments. In some embodiments, the control method comprises:

[0069] controlling the working states of the first on-off valve 3, the second on-off valve 12 and the floating electromagnetic valve 11 according to the working requirement of the power head box 8;

[0070] making the power head box 8 work in the first driving mode, the second driving mode or the third driving mode selectively.

[0071] The embodiment can control the working states of the first on-off valve 3, the second on-off valve 12 and the floating electromagnetic valve 11 according to the actual working requirement of the power head box 8, so as to select the driving mode matched with the working requirement and realize the safe switching of the driving mode, which can make the construction of the rotary drilling rig power head more energy-efficient.

[0072] In some embodiments, the control method further comprises:

[0073] receiving the pressure detected by the first pressure sensor 4 at the clutch 6 control port;

[0074] determining whether the detected value of the first pressure sensor 4 is less than a first threshold value, and if so, determining that the clutch 6 is in the engaged state, otherwise in the disengaged state; and / or

[0075] receiving the pressure detected by the second pressure sensor 13 at the hydraulic motor 10 displacement control port;

[0076] determining whether the detected value of the second pressure sensor 13 is less than a second threshold value, and if so, determining that the hydraulic motor 10 is in the working state, otherwise in the floating state.

[0077] This embodiment can determine whether the first on-off valve 3 is in the correct working state through the detected value of the first pressure sensor 4 after the drive mode is selected and the working state of the first on-off valve 3 is controlled, thereby ensuring that the drive state of the motor is consistent with the pre-selected drive mode; and / or determine whether the second on-off valve 12 is in the correct working state through the detected value of the second pressure sensor 13 after the drive mode is selected and the working state of the second on-off valve 12 is controlled, thereby ensuring that the drive state of the hydraulic motor 10 is consistent with the pre-selected drive mode.

[0078] In some specific embodiments, as shown in FIG. 2, the first on-off valve 3 and the second on-off valve 12 are both solenoid valves, and the mode selection button 1 has three working modes of motor drive mode, hydraulic motor drive mode and motor and motor synchronous drive. First, adjust the mode selection button to the desired position.

[0079] When the mode selection button 1 is in the motor drive mode, the controller 2 outputs a control signal to energize the second on-off valve 12 and the floating solenoid valve 11, so that the hydraulic motor 10 is in a zero displacement or near zero displacement state, and the first working oil port A and the second working oil port B of the hydraulic motor 10 are communicated, and the hydraulic motor 10 is in a floating state; the first on-off valve 3 is not energized, the clutch 6 control port has no pressure oil, and the clutch 6 is in the engaged state; the controller 2 confirms that the clutch 6 is in the engaged state by reading the pressure value detected by the first pressure sensor 4, confirms that the hydraulic motor 10 is in the floating state by reading the pressure value detected by the second pressure sensor 13, and outputs a control signal to the motor 5, thereby realizing independent drive of the power head box 8 by the motor 5.

[0080] When the mode selection button 1 is in the hydraulic motor 10 driving mode, the controller 2 outputs a control signal to energize the first on-off valve 3, pressure oil enters the clutch 6 control port to make it in the disengaged state, at this time the motor 5 is disengaged from the power head box 8; the controller 2 outputs a control signal to de-energize the second on-off valve 12 and the floating electromagnetic valve 11, so that the hydraulic motor 10 is in the large displacement state, and the first working oil port A and the second working oil port B of the hydraulic motor 10 are not connected; the controller 2 confirms that the clutch 6 is in the disengaged state by reading the pressure value detected by the first pressure sensor 4, and confirms that the hydraulic motor 10 is in the large displacement state by reading the pressure value detected by the second pressure sensor 13, and outputs a control signal to the hydraulic motor 10 to realize independent driving of the power head box 8 by the hydraulic motor 10.

[0081] When the mode selection button is in the motor 5 and hydraulic motor 10 synchronous driving mode, the controller 2 outputs a control signal to de-energize the first on-off valve 3, the clutch 6 control port has no pressure oil, the clutch 6 is in the connected state, at this time the motor 5 is connected with the power head box 8; the controller 2 outputs a control signal to de-energize the second on-off valve 12 and the floating electromagnetic valve 11, so that the hydraulic motor 10 is in the large displacement state, and the first working oil port A and the second working oil port B of the hydraulic motor 10 are not connected; the controller 2 confirms that the clutch 6 is in the connected state by reading the pressure value detected by the first pressure sensor 4, and confirms that the hydraulic motor 10 is in the large displacement state by reading the pressure value detected by the second pressure sensor 13, and outputs a control signal to the motor 5 and the hydraulic motor 10 to realize common driving of the power head box 8 by the motor 5 and the hydraulic motor 10.

[0082] In this embodiment, by controlling the de-energization and energization of the first on-off valve 3, the working pressure of the clutch 6 control port can be controlled, so that the clutch 6 can be in the connected state or the disengaged state, and then the connection and disconnection of the motor 5 and the first speed reducer 7 can be controlled, to realize the driving and separation of the motor 5 and the power head box 8.

[0083] By controlling the de-energization and energization of the second on-off valve 12, the working pressure of the hydraulic motor 10 displacement control port can be controlled, so that the hydraulic motor 10 can be in the large displacement state or the zero displacement or near zero displacement state; when the hydraulic motor 10 is in the large displacement state, the floating electromagnetic valve 11 is de-energized to cut off the connection between the first working oil port A and the second working oil port B of the hydraulic motor 10, and the hydraulic motor 10 can drive the power head box 8 through the second speed reducer 9; when the hydraulic motor 10 is in the zero displacement or near zero displacement state, the floating electromagnetic valve 11 is in the energized state, the first working oil port A and the second working oil port B of the hydraulic motor 10 are connected through the floating electromagnetic valve 11, and the hydraulic motor 10 is in the floating state.

[0084] The pressure of the clutch 6 control oil port is detected by the first pressure sensor 4 to determine the working state of the clutch 6, and the hydraulic motor 10 displacement control oil port pressure is detected by the second pressure sensor 13 to determine the working state of the hydraulic motor 10, and the controller 2 is matched with the working mode of the mode selection button 1 to realize the safe switching of multiple working modes.

[0085] The above is only an exemplary embodiment of the present disclosure, and is not intended to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A rotary drilling rig power head system, comprising: a power head housing (8) ; a first power assembly comprising a motor (5), a clutch (6) and a first on-off valve (3), the motor (5) being power connected with the power head housing (8) through the clutch (6), the first on-off valve (3) being connected with a control oil port of the clutch (6) and being configured to control the on-off of the clutch (6) ; a second power assembly comprising a hydraulic motor (10), a floating solenoid valve (11) and a second on-off valve (12), the hydraulic motor (10) being power connected with the power head housing (8), the hydraulic motor (10) having a first working oil port (A) and a second working oil port (B), the first working oil port (A) and the second working oil port (B) being connected through the floating solenoid valve (11), the second on-off valve (12) being communicated with a displacement control oil port of the hydraulic motor (10) and being configured to control the working pressure of the displacement control oil port of the hydraulic motor (10) ; and a controller (2) configured to control the working states of the first on-off valve (3), the second on-off valve (12) and the floating solenoid valve (11) according to the working requirements of the power head housing (8), so that the power head housing (8) is selectively operated in a first driving mode, a second driving mode or a third driving mode.

2. The rotary drilling rig powerhead system of claim 1, further comprising a mode selection button (1) configured to be responsive to an external operation and to send a signal to the controller (2) selecting the first drive mode, the second drive mode, or the third drive mode; wherein, In the first driving mode, the motor (5) drives the power head housing (8) alone, in the second driving mode, the hydraulic motor (10) drives the power head housing (8) alone, and in the third driving mode, the motor (5) and the hydraulic motor (10) synchronously drive the power head housing (8).

3. The rotary drilling rig powerhead system of claim 1 or 2, wherein, In the first driving mode, the first on-off valve (3) is in an off state, the control oil port of the clutch (6) has no pressure oil, the clutch (6) is in a connected state; the second on-off valve (12) is in an on state, the floating solenoid valve (11) is powered, the first working oil port (A) and the second working oil port (B) are communicated, and the hydraulic motor (10) is in a floating state.

4. The rotary drilling rig powerhead system of any one of claims 1-3, wherein, In the second driving mode, the first on-off valve (3) is in an on state, the control oil port of the clutch (6) obtains pressure oil, the clutch (6) is in a disconnected state; the second on-off valve (12) is in an off state, the floating solenoid valve (11) is powered off, the first working oil port (A) and the second working oil port (B) are not communicated, and the hydraulic motor (10) is in a working state.

5. The rotary drilling rig powerhead system of any one of claims 1-4, wherein, In the third driving mode, the first on-off valve (3) is in an off state, the control oil port of the clutch (6) has no pressure oil, the clutch (6) is in a connected state; and the second on-off valve (12) is in an off state, the floating solenoid valve (11) is powered off, the first working oil port (A) and the second working oil port (B) are not communicated, and the hydraulic motor (10) is in a working state. 6.The rotary drilling rig power head system according to any one of claims 1-5, further comprising: a first pressure sensor (4) configured to detect a pressure of a control oil port of the clutch (6); wherein the controller (2) is configured to determine whether the clutch (6) is in a linked state or a disengaged state according to a detection value of the first pressure sensor (4).

7. The rotary drilling rig power head system according to any one of claims 1-6, further comprising: a second pressure sensor (13) configured to detect a pressure of a displacement control oil port of the hydraulic motor (10); wherein the controller (2) is configured to determine whether the hydraulic motor (10) is in a floating state or a working state according to a detection value of the second pressure sensor (13).

8. The rotary drilling rig powerhead system of any one of claims 1-7, wherein, The first power assembly further comprises a first speed reducer (7) connected between the clutch (6) and the power head housing (8); and / or the second power assembly further comprises a second speed reducer (9) connected between the hydraulic motor (10) and the power head housing (8).

9. An auger drill rig comprising: The rotary drilling rig power head system according to any one of claims 1-8.

10. A control method based on the rotary drilling rig power head system according to any one of claims 1-8, comprising: controlling working states of the first on-off valve (3), the second on-off valve (12) and the floating solenoid valve (11) according to working requirements of the power head housing (8); making the power head housing (8) work in a first driving mode, a second driving mode or a third driving mode selectively.

11. The control method according to claim 10, further comprising: receiving a pressure of the control oil port of the clutch (6) detected by the first pressure sensor (4); determining whether the detection value of the first pressure sensor (4) is less than a first threshold value, if yes, determining that the clutch (6) is in the linked state, otherwise, in the disengaged state; and / or receiving a pressure of the displacement control oil port of the hydraulic motor (10) detected by the second pressure sensor (13); determining whether the detection value of the second pressure sensor (13) is less than a second threshold value, if yes, determining that the hydraulic motor (10) is in the working state, otherwise, in the floating state.

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