Rotary drilling rig power head soil throwing control device and method

Abstract

A rotary drilling rig power head soil throwing control device and method, the rotary drilling rig power head soil throwing control device includes a main pump module, a main valve, a power head motor and a power head, the main pump module is used for supplying oil to the power head motor through the main valve; the main valve includes first and second oil ports, the power head motor includes first and second motor oil ports, the first and second oil ports are connected to the first and second motor oil ports respectively, a first control valve is provided between the first oil port and the first motor oil port, a second control valve is provided between the second oil port and the second motor oil port, when the first oil port and the first motor oil port or the second oil port and the second motor oil port are disconnected, the first and second motor oil ports are communicated with an oil tank through a first throttle valve or a second throttle valve. By setting the first and second control valves, the pressure oil in the power head motor can be directly and quickly returned to the oil tank through the first or second throttle valve, the kinetic energy of the power head is converted into heat energy, the rapid reversing of the power head is realized, and the soil throwing efficiency of the power head is improved.

Description

Technical Field

[0001] This invention relates to the field of rotary drilling rig technology, and in particular to a control device and method for controlling the soil ejection of a rotary drilling rig's power head. Background Technology

[0002] Rotary drilling rigs are construction machines suitable for hole-forming operations in building foundation engineering. They are mainly suitable for construction in soil layers such as sand, cohesive soil, and silty soil. They are widely used in various foundation constructions such as cast-in-place piles, continuous walls, and foundation reinforcement. They generally adopt hydraulic crawler telescopic chassis, self-lifting foldable drill mast, telescopic drill rod, automatic vertical detection and adjustment, and digital display of hole depth. The whole machine is generally operated by hydraulic pilot control and load sensing, and features easy and comfortable operation.

[0003] In pile foundation construction, pressurized drilling and soil unloading by rotary drilling rigs are crucial links in the work cycle, and drilling efficiency and soil unloading efficiency directly affect work efficiency. Rotary drilling rigs operate in complex geological formations, and even within the same pile hole, the geological strata vary greatly from the ground surface to the bottom of the hole. A single drilling mode cannot adapt to all geological formations, affecting the maximum efficiency of the machine. Furthermore, commonly used drilling tools for rotary drilling rigs present difficulties in soil unloading, especially in clay layers and small-diameter piles, where soil unloading remains a significant challenge.

[0004] The rapid soil-throwing mechanism of the power head relies on the motor's rapid forward and reverse rotation. The higher the motor speed and the shorter the switching time, the higher the soil-throwing efficiency. However, the contradiction lies in the fact that a short switching time results in a short motor acceleration time, leading to a low motor speed and low soil-throwing efficiency; conversely, a long switching time results in a long motor acceleration time, a high motor speed, and low soil-throwing efficiency. Please refer to... Figure 1 A soil-throwing control device for a rotary drilling rig's power head includes a pump 91, a main valve 93, a power head motor 95, and a power head 97. The main valve 93 can switch between an upper and lower position to cause the power head motor 95 to rotate forward or reverse, thus enabling the power head 97 to throw soil. However, during the forward / reverse switching of the power head motor 95, the main valve 93 undergoes two mid-position reversals. During these reversals, the inertia generated by the power head during the forward / reverse switching must be overcome, resulting in low soil-throwing efficiency.

[0005] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Summary of the Invention

[0006] The purpose of this invention is to provide a control device and method for controlling the soil ejection of a rotary drilling rig power head with high soil ejection efficiency.

[0007] This invention provides a soil-throwing control device for a rotary drilling rig's power head, comprising a main pump module, a main valve, a power head motor, and a power head. The main pump module is connected to the main valve, the main valve is connected to the power head motor, and the power head is connected to the power head motor. The main pump module supplies oil to the power head motor through the main valve to drive the power head motor to rotate forward or in reverse. The main valve includes a first oil port and a second oil port, and the power head motor includes a first motor oil port and a second motor oil port. The first oil port is connected to the first motor oil port, and the second oil port is connected to the second motor oil port. A first control valve is provided between the first oil port and the first motor oil port to connect or disconnect the first oil port and the first motor oil port. A second control valve is provided between the second oil port and the second motor oil port to connect or disconnect the second oil port and the second motor oil port. When the first oil port and the first motor oil port are disconnected, the first motor oil port is connected to the oil tank through a first throttle valve. When the second oil port and the second motor oil port are disconnected, the second motor oil port is connected to the oil tank through a second throttle valve.

[0008] In one embodiment, the rotary drilling rig power head soil-throwing control device further includes a third control valve. The main pump module is a constant power negative flow pump. The feedback port of the main pump module is connected to the pressure port. The pressure port and the output oil port of the main pump module are connected or disconnected according to the state of the main valve. The third control valve is connected to the oil line between the feedback port and the pressure port to connect or disconnect the feedback port and the pressure port. When the feedback port is disconnected from the pressure port, the feedback port is connected to the oil tank.

[0009] In one embodiment, the third control valve, the first control valve, and the second control valve are electromagnetic directional valves. When not energized, the third control valve connects the feedback port and the pressure port. When energized, the third control valve disconnects the feedback port and the pressure port, and the feedback port connects to the oil tank. When not energized, the first control valve connects the first oil port and the first motor oil port, and the second control valve connects the second oil port and the second motor oil port. When energized, the first control valve disconnects the first oil port and the first motor oil port, and the first motor oil port connects to the oil tank. The second control valve disconnects the second oil port and the second motor oil port, and the second motor oil port connects to the oil tank.

[0010] In one embodiment, the main valve further includes a third port, a fourth port, a fifth port, and a sixth port. The third port is the pressure port. The fourth and fifth ports are connected to the output ports of the main pump module. The sixth port is connected to the oil tank. The main valve has a third position, a fourth position, and a fifth position. In the third position, the fourth and fifth ports are interconnected. In the fourth position, the first and sixth ports are interconnected, and the second and fourth ports are interconnected. In the fifth position, the first and fourth ports are interconnected, and the second and sixth ports are interconnected.

[0011] In one embodiment, the rotary drilling rig power head soil-throwing control device further includes a control module connected to the third control valve. The control module is used to acquire the working mode of the rotary drilling rig and to send a control signal to the third control valve when the rotary drilling rig is in soil-throwing mode, so that the third control valve switches to a state of disconnecting the feedback port and the pressure port. It is also used to send a control signal to the third control valve when the rotary drilling rig is not in soil-throwing mode, so that the third control valve switches to a state of connecting the feedback port and the pressure port.

[0012] In one embodiment, the control module is used to detect whether the time interval between the two most recent adjacent switching times of the soil-throwing handle of the rotary drilling rig is less than a first preset time. The control module is also used to determine that the rotary drilling rig is in soil-throwing mode when the switching time interval is less than the first preset time, and otherwise determine that the rotary drilling rig is not in soil-throwing mode.

[0013] In one embodiment, the rotary drilling rig power head soil-throwing control device further includes a timer, the control module is connected to the timer, the timer is connected to the third control valve, the control module is used to determine whether to connect the timer according to the working mode of the rotary drilling rig, and the timer is used to keep the third control valve in its original state when the rotary drilling rig is in soil-throwing mode for a second preset time.

[0014] In one embodiment, the control module is further configured to determine whether the power head motor is in a forward / reverse switching process when the rotary drilling rig is in the soil-throwing mode. The control module is further configured to provide control signals to the first control valve or the second control valve when the rotary drilling rig is in the soil-throwing mode and the power head motor is in a forward / reverse switching process, so that during the forward-to-reverse switching process, the second control valve is switched to a state where the second oil port and the second motor oil port are disconnected during the forward rotation to the middle position stage, and during the middle position to the reverse rotation stage, the second control valve is switched to a state where the second oil port and the second motor oil port are connected. During the reverse-to-forward switching process, the first control valve is switched to a state where the first oil port and the first motor oil port are disconnected during the reverse rotation to the middle position stage, and during the middle position to the forward rotation stage, the first control valve is switched to a state where the first oil port and the first motor oil port are connected. The control module is also configured to provide control signals to the first control valve and the second control valve when the power head motor is in forward / reverse rotation, so that the first control valve is switched to a state where the first oil port and the first motor oil port are connected, and the second control valve is switched to a state where the second oil port and the second motor oil port are connected.

[0015] The present invention also provides a method for controlling the soil-throwing control device of the rotary drilling rig power head, wherein the method includes:

[0016] Obtain the operating mode of the rotary drilling rig;

[0017] When the rotary drilling rig is in soil-throwing mode, it determines whether the power head motor is in a forward / reverse switching process. When the power head motor is in the middle position of the reverse-to-forward switching process, the first control valve is controlled to disconnect the first oil port and the first motor oil port. When the power head motor is in the middle position to the forward rotation stage, the first control valve is controlled to connect the first oil port and the first motor oil port. When the power head motor is in the middle position of the forward-to-reverse switching process, the second control valve is controlled to disconnect the second oil port and the second motor oil port. When the power head motor is in the middle position to the reverse rotation stage, the second control valve is controlled to connect the second oil port and the second motor oil port. When the power head motor is not in a forward / reverse switching process, the first control valve is controlled to connect the first oil port and the first motor oil port, and the second control valve is controlled to connect the second oil port and the second motor oil port.

[0018] In one embodiment, the rotary drilling rig power head soil-throwing control device further includes a third control valve. The main pump module is a constant power negative flow pump. The feedback port of the main pump module is connected to the pressure port. The pressure port and the output oil port of the main pump module are connected or disconnected according to the state of the main valve. The third control valve is connected to the oil line between the feedback port and the pressure port to connect or disconnect the feedback port and the pressure port. When the feedback port and the pressure port are disconnected, the feedback port is connected to the oil tank via the third control valve. The rotary drilling rig power head soil-throwing control method further includes: when the rotary drilling rig is in soil-throwing mode, controlling the third control valve to switch to the state of disconnecting the feedback port and the pressure port; when the rotary drilling rig is not in soil-throwing mode, controlling the third control valve to switch to the state of connecting the feedback port and the pressure port.

[0019] In the rotary drilling rig power head soil-throwing control device and method provided by the present invention, by setting a second control valve and a third control valve, the pressure oil in the power head motor can be directly and quickly returned to the oil tank through the first throttle valve or the second throttle valve, so that the kinetic energy of the power head is converted into heat energy, which can realize the rapid reversal of the power head and improve the soil-throwing efficiency of the power head. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a soil-throwing control device for a rotary drilling rig's power head.

[0021] Figure 2 This is a partial structural schematic diagram of a rotary drilling rig power head soil-throwing control device according to an embodiment of the present invention.

[0022] Figure 3 for Figure 2 This is a schematic diagram of another part of the soil-throwing control device for the power head of the rotary drilling rig.

[0023] Figure 4 This is a flowchart illustrating a method for controlling soil ejection from the power head of a rotary drilling rig according to an embodiment of the present invention.

[0024] Figure 5 for Figure 4 The detailed process of step S13 in the flowchart of the soil-throwing control method of the rotary drilling rig power head is shown. Detailed Implementation

[0025] To further illustrate the technical methods and effects of the present invention in order to achieve the intended purpose, the specific implementation methods, structure, features and effects of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0026] To further illustrate the technical methods and effects of the present invention in order to achieve the intended purpose, the specific implementation methods, structure, features and effects of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0027] Please refer to Figure 2 An embodiment of the rotary drilling rig power head soil-throwing control device of the present invention includes a main pump module 11, a main valve 13, a power head motor 15, and a power head 17. The main pump module 11 is connected to the main valve 13, the main valve 13 is connected to the power head motor 15, and the power head 17 is connected to the power head motor 15. The main pump module 11 is used to supply oil to the power head motor 15 through the main valve 13 to drive the power head motor 15 to rotate forward or in reverse. The main valve 13 includes a first oil port 131 and a second oil port 133. The power head motor 15 includes a first motor oil port 151 and a second motor oil port 153. The first oil port 131 is connected to the first motor oil port 151, and the second oil port 133 is connected to the second motor oil port 153. A first control valve 19 is provided between the first oil port 131 and the first motor oil port 151 to connect or disconnect the two ports. A second control valve 21 is provided between the second oil port 133 and the second motor oil port 153 to connect or disconnect the two ports. When the first oil port 131 and the first motor oil port 151 are disconnected, the first motor oil port 151 is connected to the oil tank through the first throttle valve 192. When the second oil port 133 and the second motor oil port 153 are disconnected, the second motor oil port 153 is connected to the oil tank through the second throttle valve 212. By setting the first control valve 19 and the second control valve 21, the pressurized oil in the power head motor 15 can flow directly and quickly back to the oil tank through the first throttle valve 192 or the second throttle valve 212, so that the kinetic energy of the power head is converted into heat energy, which can realize the rapid reversal of the power head and improve the soil throwing efficiency of the power head.

[0028] Specifically, the first control valve 19 and the second control valve 21 can be solenoid directional valves. When de-energized, the first control valve 19 connects the first oil port 131 and the first motor oil port 151, and the second control valve 21 connects the second oil port 133 and the second motor oil port 153. When energized, the first control valve 19 disconnects the first oil port 131 and the first motor oil port 151, and the first motor oil port 151 is connected to the oil tank; the second control valve 21 disconnects the second oil port 133 and the second motor oil port 153, and the second motor oil port 153 is connected to the oil tank. Specifically, the first control valve 19 and the second control valve 21 are two-position two-way valves. The first control valve 19 is in the first position (i.e.,...) Figure 2 In the middle left position, the first oil port 131 and the first motor oil port 151 are connected; in the second position (i.e. Figure 2 When in the middle right position, the first oil port 131 and the first motor oil port 151 are disconnected, and the first motor oil port 151 is connected to the oil tank. The second control valve 21 is in the first position (i.e.,...). Figure 2When in the middle left position, the second oil port 133 and the second motor oil port 153 are connected; in the second position (i.e. Figure 2 When in the middle right position, the second oil port 133 and the second motor oil port 153 are disconnected, and the second motor oil port 153 is connected to the oil tank. More specifically, the first control valve 19 includes a first port, a second port, and a third port. The first port is connected to the first motor oil port 151, the second port is connected to the main valve 13, and the third port is connected to the oil tank. The first throttle valve 192 is located between the first port and the third port. The second control valve 21 includes a fourth port, a fifth port, and a sixth port. The fourth port is connected to the second motor oil port 153, the fifth port is connected to the main valve 13, and the sixth port is connected to the oil tank. The second throttle valve 212 is located between the fourth port and the sixth port.

[0029] In this embodiment, the main pump module 11 is a constant power negative flow pump. The rotary drilling rig power head soil-throwing control device also includes a third control valve 23. The feedback port of the main pump module 11 is connected to the pressure port. The pressure port and the output oil port of the main pump module 11 are connected or disconnected according to the state of the main valve 13. The third control valve 23 is connected to the oil line between the feedback port and the pressure port to connect or disconnect the feedback port and the pressure port. When the feedback port is disconnected from the pressure port, the feedback port is connected to the oil tank. The third control valve 23 can connect the feedback port of the main pump module 11 to the oil tank instead of the pressure port, so that the feedback pressure received by the main pump module 11 is always zero. This ensures that the main pump module 11 can always be at maximum displacement when the valve core of the main valve 13 is switching positions, thereby increasing the motor acceleration and improving the soil-throwing efficiency of the power head while ensuring the number of forward and reverse switching times per unit time.

[0030] Specifically, the third control valve 23 can be a solenoid directional valve. When de-energized, the third control valve 23 connects the feedback port and the pressure port; when energized, the third control valve 23 disconnects the feedback port and the pressure port, and the feedback port is connected to the oil tank. Specifically, the third control valve 23 is a two-position two-way valve, in the first position (i.e. Figure 2 In the middle right position, the feedback port and the pressure port are connected; in the second position (i.e. Figure 2 When in the middle left position, the feedback port and pressure port are disconnected, and the feedback port is connected to the oil tank.

[0031] In this embodiment, the main pump module 11 includes a main pump 112, a servo cylinder 113, a constant power valve 114, and a plunger 115. The servo cylinder 113 is connected to the swashplate of the main pump 112, the constant power valve 114 is connected to the servo cylinder 113, and the plunger 115 is connected to the control end of the constant power valve 114. The plunger 115 is connected to the feedback port and is used to adjust its position according to the pressure of the system feedback port to drive the constant power valve 114 to reverse, thereby driving the servo cylinder 113 to move, so as to drive the swashplate of the main pump 112 to swing, thereby realizing the adjustment of the displacement of the main pump 112. Specifically, the constant power valve 114 includes a first valve port, a second valve port, and a third valve port. The first valve port is connected to the oil tank, the second valve port is connected to the output oil port of the main pump 112, and the third valve port is connected to the oil chamber of the servo cylinder 113. The constant power valve 114 switches positions to connect the first valve port and the third valve port so that the oil in the oil chamber of the servo cylinder 113 flows back to the oil tank, or connects the second valve port and the third valve port so that the pressure oil from the output oil port of the main pump 112 enters the oil chamber of the servo cylinder 113, or disconnects the first valve port, the second valve port, and the third valve port.

[0032] In this embodiment, the main valve 13 further includes a third oil port 134, a fourth oil port 135, a fifth oil port 136, and a sixth oil port 137. The third oil port 134 is a pressure port, the fourth oil port 135 and the fifth oil port 136 are connected to the output ports of the main pump 112 of the main pump module 11, and the sixth oil port 137 is connected to the oil tank. The main valve 13 includes a third position (i.e.,...) Figure 2 The median), the fourth position (i.e. Figure 2 The upper position) and the fifth position (i.e. Figure 2 (The lower position in the middle). In the third position, the third oil port 134 and the fifth oil port 136 are connected, and the remaining oil ports are disconnected from other oil ports; in the fourth position, the first oil port 131 and the sixth oil port 137 are connected, and the second oil port 133 and the fourth oil port 135 are connected; in the fifth position, the first oil port 131 and the fourth oil port 135 are connected, and the second oil port 133 and the sixth oil port 137 are connected.

[0033] Specifically, the main valve 13 can be a hydraulically controlled valve, and its position is controlled by whether or not pilot oil is supplied to both ends of the main valve 13. Specifically, the operator can control the flow of pilot oil to port a or port b through the operating handle, thereby controlling the switching of the main valve 13.

[0034] In this embodiment, please refer to Figure 3The rotary drilling rig power head soil-throwing control device also includes a control module 31, which is connected to the third control valve 23. The control module 31 is used to obtain the working mode of the rotary drilling rig and to give a control signal to the third control valve 23 when the rotary drilling rig is in the soil-throwing mode, so that the third control valve 23 switches to the state of disconnecting the feedback port and the pressure port. It is also used to give a control signal to the third control valve 23 when the rotary drilling rig is not in the soil-throwing mode, so that the third control valve 23 switches to the state of connecting the feedback port and the pressure port. At this time, the discharge of the main pump module 11 depends on the system working condition, that is, the discharge of the main pump module 11 is adjusted according to the system pressure feedback.

[0035] Specifically, the control module 31 is used to detect whether the time interval T between the two most recent adjacent switching times of the soil-throwing handle of the rotary drilling rig is less than the first preset time T0. The control module 31 is also used to determine that the rotary drilling rig is in soil-throwing mode when the switching time interval T is less than the first preset time T0, otherwise it is determined that the rotary drilling rig is not in soil-throwing mode.

[0036] Specifically, the rotary drilling rig's power head soil-throwing control device also includes a timer 33. A control module 31 is connected to the timer 33, which is connected to the third control valve 23. The control module 31 determines whether to connect the timer 33 based on the rotary drilling rig's operating mode. The timer 33 keeps the third control valve 23 in its original state when the rotary drilling rig is in soil-throwing mode for a second preset time period. Specifically, the timer 33 can be a time-delay relay. By setting the timer 33, the state of the third control valve 23 can be prevented from switching arbitrarily during periods when the soil-throwing handle is not operated.

[0037] In this embodiment, the control module 31 is further configured to determine whether the power head motor 15 is in a forward / reverse switching process when the rotary drilling rig is in the soil-throwing mode. The control module 31 is also configured to send a control signal to the first control valve 19 or the second control valve 21 when the rotary drilling rig is in the soil-throwing mode and the power head motor 15 is in a forward / reverse switching process. This is to switch the second control valve 21 to a state where the second oil port 133 and the second motor oil port 153 are disconnected during the forward rotation to reverse rotation phase, and to switch the second control valve 21 to a state where the second oil port 133 and the second motor oil port 153 are connected during the phase from the intermediate position to the reverse rotation phase. The rotary drilling rig's power head soil-throwing control device includes a displacement detection element. During the reverse-to-forward rotation process, in the intermediate position phase, the first control valve 19 is switched to a state where the first oil port 131 and the first motor oil port 151 are disconnected. In the transition from the intermediate position to forward rotation, the first control valve 19 is switched to a state where the first oil port 131 and the first motor oil port 151 are connected. This control signal is also used to provide control signals to the first control valve 19 and the second control valve 21 during the forward and reverse rotation of the power head motor 15, causing the first control valve 19 to switch to a state where the first oil port 131 and the first motor oil port 151 are connected, and causing the second control valve 21 to switch to a state where the second oil port 133 and the second motor oil port 153 are connected. Specifically, the rotary drilling rig's power head soil-throwing control device also includes a displacement detection element, which is used to detect the position of the valve core of the main valve 13. The control module 31 is specifically used to detect whether the time interval T between the two most recent adjacent switching times of the rotary drilling rig's soil-throwing handle is less than a first preset time T0. The control module 31 is also used to determine that the rotary drilling rig is in soil-throwing mode when the switching time interval T is less than the first preset time T0; otherwise, it determines that the rotary drilling rig is not in soil-throwing mode. The control module 31 is also used to determine, based on the detection results of the displacement detection element, whether the main valve 13 has moved from the lower position to the middle position, or from the upper position to the middle position, when the rotary drilling rig is in soil-throwing mode. When the main valve 13 moves from the lower position to the middle position, it indicates that the power head motor 15 is switching from forward to reverse rotation. At this time, the control module 31 controls the second control valve 21 to the right position, disconnecting the second oil port 133 and the second motor oil port 153. The second motor oil port 153 is directly connected to the oil tank. When the main valve 13 moves from the lower position to the middle position, the control module 31 controls the second control valve 21 to the left position, connecting the second oil port 133 and the second motor oil port 153. When the main valve 13 moves from the upper position to the middle position, it indicates that the power head motor... When 15 is in the process of switching from reverse to forward rotation, the control module 31 controls the first control valve 19 to be in the right position, disconnecting the first oil port 131 and the first motor oil port 151. The first motor oil port 151 is directly connected to the oil tank. When the main valve 13 moves from the upper position to the middle position, the control module 31 controls the first control valve 19 to be in the left position, connecting the first oil port 131 and the first motor oil port 151. When the main valve 13 is neither moved from the lower position to the middle position nor from the upper position to the middle position, both the first control valve 19 and the second control valve 21 are in the left position.

[0038] The following combination Figure 2 The working process of the soil-throwing control device of the rotary drilling rig's power head is explained.

[0039] When the main pump module 11 is not activated, the constant power valve 114 is in the right position, and the main valve 13 is in the neutral position. When the main pump module 11 is activated, and the rotary drilling rig is not in the soil-throwing mode, the first control valve 19 and the second control valve 21 are de-energized and are in the left position, and the third control valve 23 is de-energized and is in the right position. The pressurized oil is output from the output port of the main pump 112, sequentially reaching the fifth port 136 and the third port 134 of the main valve 13, and then through the third control valve 23 to the plunger 115, pushing the valve core of the constant power valve 114 to the left, so that the constant power valve 114 is in the left position. At this time, the pressure output by the main pump 112 is... The oil also passes through the constant power valve 114 to the left chamber of the servo cylinder 113, pushing the servo cylinder 113 to move to the right, reducing the displacement of the main pump 112. When the rotary drilling rig is in the soil-throwing mode, the first control valve 19 or the second control valve 21 is energized and in the right position, and the third control valve 23 is energized and in the left position. The feedback port is connected to the oil tank, and the oil in the plunger 115 flows back to the oil tank. The movement of the plunger 115 drives the valve core of the constant power valve 114 to move to the right, so that the constant power valve 114 is in the right position. At this time, the main pump 112... The output pressure oil cannot pass through the constant power valve 114, and the hydraulic oil in the left chamber of the servo cylinder 113 flows back to the oil tank. The servo cylinder 113 moves to the left under the action of the spring or the oil, and the displacement of the main pump 112 increases to the maximum. This enables the rotary drilling rig's power head soil-throwing control device to achieve constant power control in non-soil-throwing mode. In soil-throwing mode, it can ensure that the main pump module 11 can always be at the maximum displacement when the main valve 13 is in the middle position (i.e., during the forward and reverse switching of the power head motor), thereby increasing the motor acceleration and improving the soil-throwing efficiency of the power head while ensuring the number of forward and reverse switching times per unit time. At the same time, when the power head motor 15 switches from forward to reverse, the second control valve 21 is energized and located in the right position. The pressure oil in the power head motor 15 flows directly and quickly back to the oil tank through the second control valve 21. When the power head motor 15 switches from reverse to forward, the first control valve 19 is energized and located in the right position. The pressure oil in the power head motor 15 flows directly and quickly back to the oil tank through the first control valve 19.

[0040] When the power head motor 15 rotates forward, the first control valve 19 and the second control valve 21 are not in the left position, the main valve 13 is in the lower position, and the pressure oil is output from the output port of the main pump 112, and sequentially reaches the fourth port 135 and the first port 131 of the main valve 13. Then, it reaches the first motor port 151 of the power head motor 15 through the first control valve 19, driving the power head motor 15 to rotate forward. The return oil from the second motor port 153 passes through the second control valve 21 to the second port 133 and the sixth port 137 of the main valve 13, and then flows back to the oil tank. When the power head motor 15 reverses, the first control valve 19 and the second control valve 21 are not in the left position, the main valve 13 is in the upper position, and the pressure oil is output from the output port of the main pump 112, sequentially reaching the sixth port 137 and the second port 133 of the main valve 13, and then reaching the second motor port 153 of the power head motor 15 through the second control valve 21, driving the power head motor 15 to reverse. The return oil from the first motor port 151 passes through the first control valve 19 to the first port 131 and the fourth port 135 of the main valve 13, and then flows back to the oil tank.

[0041] The present invention also provides a method for controlling the soil-throwing control device of the rotary drilling rig power head, the method comprising:

[0042] S11, obtain the working mode of the rotary drilling rig;

[0043] S13, when the rotary drilling rig is in the soil-throwing mode, determine whether the power head motor 15 is in the forward / reverse switching process. When the power head motor 15 is in the reverse to the middle position stage of the process of switching from reverse to forward rotation, control the first control valve 19 to switch to the state of disconnecting the first oil port 131 and the first motor oil port 151. When the power head motor 15 is in the middle position to the forward rotation stage, control the first control valve 19 to switch to the state of connecting the first oil port 131 and the first motor oil port 151. When the power head motor 15 is in the forward to the middle position stage of the process of switching from forward to reverse rotation, control the first control valve 19 to switch to the state of connecting the first oil port 131 and the first motor oil port 151. During the intermediate position phase, the second control valve 21 is switched to disconnect the second oil port 133 and the second motor oil port 153. When the power head motor 15 is in the intermediate position to the reverse phase, the second control valve 21 is switched to connect the second oil port 133 and the second motor oil port 153. When the power head motor 15 is not in the forward and reverse switching process, the first control valve 19 is switched to connect the first oil port 131 and the first motor oil port 151, and the second control valve 21 is switched to connect the second oil port 133 and the second motor oil port 153.

[0044] Specifically, please refer to Figure 5 Step S13 specifically includes:

[0045] S132, detect the valve core position of main valve 13.

[0046] S134, when the rotary drilling rig is in the soil-throwing mode, determine whether the main valve 13 has moved from the lower position to the middle position and whether it has moved from the upper position to the middle position; when the main valve 13 is moving from the lower position to the middle position, proceed to step S136; when the main valve 13 is moving from the upper position to the middle position, proceed to step S140; when the main valve 13 is neither moving from the lower position to the middle position nor moving from the lower position to the middle position, proceed to step S144.

[0047] S136, control the second control valve 21 to switch to the right position, disconnect the second oil port 133 and the second motor oil port 153, and the second motor oil port 153 is directly connected to the oil tank.

[0048] S137, when the second control valve 21 is in the right position, determine whether the main valve 13 has reached the neutral position. If so, proceed to step S138.

[0049] S138 controls the second control valve 21 to switch to the left position, connecting the second oil port 133 and the second motor oil port 153.

[0050] S140, control the first control valve 19 to the right position, disconnect the first oil port 131 and the first motor oil port 151, and the first motor oil port 151 is directly connected to the oil tank.

[0051] S141, when the first control valve 19 is in the right position, determine whether the main valve 13 has reached the neutral position. If so, proceed to step S142.

[0052] S142, control the first control valve 19 to switch to the left position, connecting the first oil port 131 and the first motor oil port 151.

[0053] S144, control the first control valve 19 and the second control valve 21 to the left position. Step S11 specifically includes: detecting whether the time interval T between the two most recent adjacent switching times of the rotary drilling rig's soil-throwing handle is less than a first preset time T0. When the switching time interval T is less than the first preset time T0, it is determined that the rotary drilling rig is in soil-throwing mode; otherwise, it is determined that the rotary drilling rig is not in soil-throwing mode.

[0054] Step S13 further includes: when the rotary drilling rig is in the soil-throwing mode, controlling the third control valve 23 to switch to the state of disconnecting the feedback port and the pressure port; when the rotary drilling rig is not in the soil-throwing mode, controlling the third control valve 23 to switch to the state of connecting the feedback port and the pressure port.

[0055] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A soil-throwing control device for a rotary drilling rig's power head, characterized in that, The system includes a main pump module (11), a main valve (13), a power head motor (15), a power head (17), a third control valve (23), and a control module (31). The main pump module (11) is connected to the main valve (13), the main valve (13) is connected to the power head motor (15), and the power head (17) is connected to the power head motor (15). The main pump module (11) supplies oil to the power head motor (15) through the main valve (13) to drive the power head motor (15) to rotate forward or reverse. The main valve (13) includes a first oil port (131) and a second oil port (133). The power head motor (15) includes a first motor oil port (151) and a second motor oil port (153). The first oil port (131) is connected to the first motor oil port (151), and the second oil port (133) is connected to the second motor oil port (153). 133) Connected to the second motor oil port (153), a first control valve (19) is provided between the first oil port (131) and the first motor oil port (151) to connect or disconnect the first oil port (131) and the first motor oil port (151), a second control valve (21) is provided between the second oil port (133) and the second motor oil port (153) to connect or disconnect the second oil port (133) and the second motor oil port (153), and when the first oil port (131) and the first motor oil port (151) are disconnected, the first motor oil port (151) is connected to the oil tank through the first throttle valve (192), and when the second oil port (133) and the second motor oil port (153) are disconnected, the second motor oil port (153) is connected to the oil tank through the second throttle valve (212);The control module (31) is connected to the third control valve (23). The control module (31) is used to determine whether the power head motor (15) is in the forward / reverse switching process when the rotary drilling rig is in the soil-throwing mode. The control module (31) is also used to give a control signal to the first control valve (19) or the second control valve (21) when the rotary drilling rig is in the soil-throwing mode and the power head motor (15) is in the forward / reverse switching process, so that during the forward-to-reverse switching process, the second control valve (21) is switched to the state of disconnecting the second oil port (133) and the second motor oil port (153) in the middle position stage of the forward rotation to reverse rotation process, and during the middle position to reverse rotation stage, the second control valve (21) is switched to the state of connecting the second oil port (133) and the second motor oil port (153). In the reverse-to-forward rotation process, during the intermediate position phase, the first control valve (19) is switched to a state where the first oil port (131) and the first motor oil port (151) are disconnected. During the intermediate position to forward rotation phase, the first control valve (19) is switched to a state where the first oil port (131) and the first motor oil port (151) are connected. This is used to provide control signals to the first control valve (19) and the second control valve (21) when the power head motor (15) rotates forward and backward, so that the first control valve (19) switches to a state where the first oil port (131) and the first motor oil port (151) are connected, and the second control valve (21) switches to a state where the second oil port (133) and the second motor oil port (153) are connected.

2. The rotary drilling rig power head soil-throwing control device as described in claim 1, characterized in that, The main pump module (11) is a constant power negative flow pump. The feedback port of the main pump module (11) is connected to the pressure port. The pressure port and the output oil port of the main pump module (11) are connected or disconnected according to the state of the main valve (13). The third control valve (23) is connected to the oil line between the feedback port and the pressure port to connect or disconnect the feedback port and the pressure port. When the feedback port is disconnected from the pressure port, the feedback port is connected to the oil tank.

3. The rotary drilling rig power head soil-throwing control device as described in claim 2, characterized in that, The third control valve (23), the first control valve (19), and the second control valve (21) are electromagnetic directional valves. When not energized, the third control valve (23) connects the feedback port and the pressure port. When energized, the third control valve (23) disconnects the feedback port and the pressure port, and the feedback port is connected to the oil tank. When not energized, the first control valve (19) connects the first oil port (131) and the first motor oil port (151), and the second control valve (21) connects the second oil port (133) and the second motor oil port (153). When energized, the first control valve (19) disconnects the first oil port (131) and the first motor oil port (151), and the first motor oil port (151) is connected to the oil tank. The second control valve (21) disconnects the second oil port (133) and the second motor oil port (153), and the second motor oil port (153) is connected to the oil tank.

4. The rotary drilling rig power head soil-throwing control device as described in claim 2, characterized in that, The main valve (13) further includes a third oil port (134), a fourth oil port (135), a fifth oil port (136), and a sixth oil port (137). The third oil port (134) is the pressure port. The fourth oil port (135) and the fifth oil port (136) are connected to the output oil port of the main pump module (11). The sixth oil port (137) is connected to the oil tank. The main valve (13) includes a third position, a fourth position, and a fifth position. In the third position, the fourth oil port (135) and the fifth oil port (136) are interconnected. In the fourth position, the first oil port (131) and the sixth oil port (137) are interconnected, and the second oil port (133) and the fourth oil port (135) are interconnected. In the fifth position, the first oil port (131) and the fourth oil port (135) are interconnected, and the second oil port (133) and the sixth oil port (137) are interconnected.

5. The rotary drilling rig power head soil-throwing control device as described in claim 2, characterized in that, The control module (31) is used to acquire the working mode of the rotary drilling rig, and to give a control signal to the third control valve (23) when the rotary drilling rig is in the soil-throwing mode, so that the third control valve (23) switches to the state of disconnecting the feedback port and the pressure port, and to give a control signal to the third control valve (23) when the rotary drilling rig is not in the soil-throwing mode, so that the third control valve (23) switches to the state of connecting the feedback port and the pressure port.

6. The rotary drilling rig power head soil-throwing control device as described in claim 5, characterized in that, The control module (31) is used to detect whether the time interval (T) between the two most recent adjacent switching times of the soil-throwing handle of the rotary drilling rig is less than a first preset time (T0). The control module (31) is also used to determine that the rotary drilling rig is in soil-throwing mode when the switching time interval (T) is less than the first preset time (T0), otherwise it is determined that the rotary drilling rig is not in soil-throwing mode.

7. The rotary drilling rig power head soil-throwing control device as described in claim 5, characterized in that, The rotary drilling rig power head soil-throwing control device also includes a timer (33), the control module (31) is connected to the timer (33), the timer (33) is connected to the third control valve (23), the control module (31) is used to determine whether to connect the timer (33) according to the working mode of the rotary drilling rig, and the timer (33) is used to keep the third control valve (23) in its original state when the rotary drilling rig is in soil-throwing mode within a second preset time.

8. A method for controlling the soil-throwing control device of a rotary drilling rig power head as described in any one of claims 1-7, characterized in that, The method for controlling soil ejection from the power head of the rotary drilling rig includes: Obtain the operating mode of the rotary drilling rig; When the rotary drilling rig is in the soil-throwing mode, it is determined whether the power head motor (15) is in the forward / reverse switching process. When the power head motor (15) is in the middle position stage of the reverse to forward switching process, the first control valve (19) is controlled to switch to the state of disconnecting the first oil port (131) and the first motor oil port (151). When the power head motor (15) is in the middle position to forward rotation stage, the first control valve (19) is controlled to switch to the state of connecting the first oil port (131) and the first motor oil port (151). When the power head motor (15) is in the middle position stage of the forward to reverse switching process, the control valve (19) is controlled to switch to the state of connecting the first oil port (131) and the first motor oil port (151). The second control valve (21) is switched to a state where the second oil port (133) and the second motor oil port (153) are disconnected. When the power head motor (15) is in the intermediate position to the reverse stage, the second control valve (21) is switched to a state where the second oil port (133) and the second motor oil port (153) are connected. When the power head motor (15) is not in the forward and reverse switching process, the first control valve (19) is switched to a state where the first oil port (131) and the first motor oil port (151) are connected, and the second control valve (21) is switched to a state where the second oil port (133) and the second motor oil port (153) are connected.

9. The method for controlling soil ejection from the power head of a rotary drilling rig as described in claim 8, characterized in that, The main pump module (11) is a constant power negative flow pump. The feedback port of the main pump module (11) is connected to the pressure port. The pressure port and the output oil port of the main pump module (11) are connected or disconnected according to the state of the main valve (13). The third control valve (23) is connected to the oil line between the feedback port and the pressure port to connect or disconnect the feedback port and the pressure port. When the feedback port and the pressure port are disconnected, the feedback port and the oil tank are connected to the third control valve (23). The rotary drilling rig power head soil-throwing control method also includes: when the rotary drilling rig is in soil-throwing mode, the third control valve (23) is controlled to switch to the state of disconnecting the feedback port and the pressure port. When the rotary drilling rig is not in soil-throwing mode, the third control valve (23) is controlled to switch to the state of connecting the feedback port and the pressure port.

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