Rod changing control system and drilling rig

Abstract

The present invention discloses a rod-changing control system, comprising a main valve assembly, a pilot valve assembly, and a control component. The main valve assembly includes a main valve 1, which is connected to an oil inlet P and is connected to both a left oil cylinder and a right oil cylinder. The piston rods of the left and right oil cylinders are both connected to a power head. The pilot valve assembly includes a solenoid valve 2 and a solenoid valve 3 for controlling the direction of the main valve 1. The solenoid valve 2 is connected to port a of the main valve 1, and the solenoid valve 3 is connected to port b of the main valve 1. A solenoid valve 4 is connected between the solenoid valve 2 and the oil inlet P, and a solenoid valve 5 is connected between the solenoid valve 3 and the oil inlet P. The control component includes a controller, which is configured to control the direction of the solenoid valves 4 and 5 according to a received electrical signal. This system design ensures that the power head can be raised and lowered, that is, the power head can be connected to or removed from the drill pipe.

Description

Technical Field

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

[0002] Deep well drilling rigs are special equipment for shallow resource exploitation. They are mainly used for drilling and exploiting resources such as coalbed methane, shale gas, shallow oil, geothermal energy, and groundwater. They have the advantages of large hole diameter and high drilling efficiency. They are also used in special occasions such as mine rescue and gas extraction.

[0003] At present, the lifting and lowering of the power head of deep well drilling rigs are basically controlled by hydraulic manual control, and most of them have only one lifting and lowering speed. Some have no floating function or the floating effect is very slow, or the power head floats to a certain position and stagnates. At this time, the power head has run to the top of the drilling tower, and the drill rod has not returned to the vertical downward position. It is necessary to manually press the drill rod downward with external force until it is vertically downward in order to dock with the drill rod below. This not only affects the rod changing speed of the drilling rig, but also is prone to dangerous accidents due to its close proximity to the wellhead. Summary of the Invention

[0004] The object of the present invention is to provide a rod changing control system and a drilling rig, so as to solve the problem in the prior art that manual control of the lifting and lowering of the power head is poor and inconvenient.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0006] A rod change control system, comprising:

[0007] The main valve assembly includes a main valve 1, the main valve 1 is connected to the oil inlet P, the first working oil port of the main valve 1 is connected to the rod chamber of the left oil cylinder and the rod chamber of the right oil cylinder, and the second working oil port of the main valve 1 is connected to the rodless chamber of the left oil cylinder and the rodless chamber of the right oil cylinder; the piston rods of the left oil cylinder and the right oil cylinder are both connected to the power head;

[0008] The pilot valve assembly includes a solenoid valve 2 and a solenoid valve 3 for controlling the reversing of the main valve 1. The solenoid valve 2 is connected to the port a of the main valve 1, and the solenoid valve 3 is connected to the port b of the main valve 1. The solenoid valve 4 is connected between the solenoid valve 2 and the oil inlet P, and the solenoid valve 5 is connected between the solenoid valve 3 and the oil inlet P.

[0009] The control component includes a controller, which is configured to control the reversing of the solenoid valve four and the solenoid valve five according to the received electrical signal.

[0010] Furthermore, the main valve assembly further includes a main valve 2 connected to the oil inlet P, a port a of the main valve 2 is connected to the solenoid valve 2, and a port b of the main valve 2 is connected to the solenoid valve 3;

[0011] A left throttle valve is provided between the first working oil port of the main valve 2 and the rod chamber of the left oil cylinder and the rod chamber of the right oil cylinder, and a right throttle valve is provided between the second working oil port of the main valve 2 and the rodless chamber of the left oil cylinder and the rodless chamber of the right oil cylinder;

[0012] The controller is configured to control the reversing of the second solenoid valve and the third solenoid valve according to the received electrical signal.

[0013] Control the reversing of solenoid valve 2 and solenoid valve 3, and control the reversing of solenoid valve 4 to open. The pilot oil flows in from port P, passes through solenoid valve 4, and then flows into main valve 2 through solenoid valve 2. The reversing of main valve 2 is controlled. The working oil flows to main valve 2 through port P, and enters the rodless chamber through the second working oil port of main valve 2 and the right throttle valve, driving the extension of the piston rod to achieve the tilting of the power head; control the reversing of solenoid valve 5 to open. The pilot oil flows in from port P, passes through solenoid valve 5, and then controls the reversing of main valve 2 through solenoid valve 3. The working oil flows to main valve 2 through port P, and enters the rod chamber through the first working oil port of main valve 2 and the left throttle valve, driving the retraction of the piston rod to achieve the retraction of the power head; the left throttle valve and the right throttle valve are designed in the scheme to adjust the speed of the power head tilting and falling, effectively ensuring the stability of the power head rod changing;

[0014] Furthermore, the pilot valve assembly further comprises a solenoid valve 1 connected between the oil inlet P and the port a of the main valve 1;

[0015] The controller is configured to control the reversing of the solenoid valve 1 according to the received electrical signal so that the oil inlet P2 of the main valve 1 is connected to the oil return port T of the main valve 1.

[0016] Control solenoid valve 1 to switch and open, pilot oil flows in from port P, enters main valve 1 through solenoid valve 1 to control the switching of main valve 1, and working oil enters main valve 1 through port P. At this time, port P is connected with port T of main valve 1, and the oil in the rod chamber and rodless chamber of the left and right cylinders is connected. The power head is in a floating state. The floating design protects the internal thread of the power head and the external thread of the newly connected drill pipe.

[0017] Furthermore, the rod chamber and the rodless chamber of the left oil cylinder and the rod chamber and the rodless chamber of the right oil cylinder are all connected to the oil return port T.

[0018] Furthermore, it also includes a control handle connected to the controller signal and a second button with an enabling function;

[0019] The controller is configured to control the size of the reversing openings of solenoid valve four and solenoid valve five according to the signal of button two and the rotation angle of the control handle; the greater the angle at which the control handle rotates forward, the larger the reversing opening of solenoid valve four controlled by the controller, and the greater the angle at which the control handle rotates backward, the larger the reversing opening of solenoid valve five controlled by the controller.

[0020] This design can control the size of the reversing opening of solenoid valve four and solenoid valve five according to the rotation angle of the control handle, thereby realizing the flow direction control of the pilot oil, and allowing the pilot oil to enter solenoid valve two or solenoid valve three; through the design of button two with an enabling function, incorrect operation can be prevented, thereby ensuring the operational safety of the operating handle.

[0021] Furthermore, it also includes a selection switch connected to the controller, and the controller is configured to control the reversing of the solenoid valve 2 and the solenoid valve 3 according to the signal of the selection switch.

[0022] This design can control the reversing of solenoid valve 2 and solenoid valve 3 according to the selection switch to realize the control of the reversing of main valve 1 and main valve 2.

[0023] Furthermore, it also includes a control handle, button 1 and button 2 with an enabling function connected to the controller signal. The controller is configured to control the reversing of solenoid valve 1 according to the signal of button 1, the signal of button 2 and the rotation angle of the control handle.

[0024] This design can effectively control the floating of the power head according to the reversing of the solenoid valve 1 and the reversing of the main valve 1.

[0025] Furthermore, the main valve 1 is a four-position six-way reversing valve.

[0026] Furthermore, the second main valve is a three-position six-way reversing valve.

[0027] The present application also discloses a drilling rig, comprising any one of the rod change control systems described above.

[0028] According to the above technical scheme, the embodiments of the present invention have at least the following effects: the present application controls the solenoid valve four to be switched open, the pilot oil flows in from the P port, passes through the solenoid valve four, and then controls the main valve one to be switched through the solenoid valve two, the working oil flows to the main valve one through the P port, and enters the rodless chamber through the second working oil port of the main valve one, driving the extension of the piston rod to realize the tilting of the power head, and then controls the solenoid valve five to be switched open, the pilot oil flows in from the P port, passes through the solenoid valve five, and then controls the main valve one to be switched through the solenoid valve three, the working oil flows to the main valve one through the P port, and enters the rod chamber through the first working oil port of the main valve one, driving the retraction of the piston rod to realize the falling back of the power head; the design of this system conveniently realizes the lifting and falling back of the power head and can ensure the lifting and falling back effect, thereby ensuring the effect of the power head connecting or disassembling the drill rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the hydraulic control principle of a specific embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the electrical control principle of a specific embodiment of the present invention;

[0031] Figure 3 It is a structural schematic diagram of the power head in a specific embodiment of the present invention.

[0032] Among them: 1. Solenoid valve 1; 2. Solenoid valve 2; 3. Main valve 1; 4. Left oil cylinder; 5. Right oil cylinder; 6. Left throttle valve; 7. Right throttle valve; 8. Main valve 2; 9. Solenoid valve 3; 10. Solenoid valve 4; 11. Solenoid valve 5; 12. Fuel tank; 13. Main valve assembly; 14. Pilot valve assembly; 15. Controller; 16. Control handle; 17. Button 1; 18. Button 2; 19. Selector switch; 20. Power head. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0034] It should be noted that, in the description of the present invention, the terms "front," "rear," "left," "right," "up," "down," "inside," and "outside" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are intended solely to facilitate the description of the present invention and do not require that the present invention be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. The terms "front," "rear," "left," "right," "up," and "down" used in the description of the present invention refer to directions in the accompanying drawings, and the terms "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0035] A deep-well drilling rig primarily consists of a traveling chassis, working devices (including a derrick, top drive unit, tool winch, shackle, and mud manifold), as well as power, hydraulic, and electrical systems. Because drilling rigs drill deep holes (typically hundreds to thousands of meters), to ensure verticality, the ground beneath the rig chassis must be leveled and compacted before work begins. The front, rear, left, and right outriggers on each side of the rig chassis must then be raised. If the ground cannot be leveled, the rig can be leveled using the front, rear, left, and right outriggers to ensure secure contact with the ground. The derrick, or working device, is then raised vertically to the ground using a handle. The derrick has one outrigger on each side, and the extension and retraction of the left and right hydraulic cylinders control the extension and retraction of the outriggers, ensuring reliable and stable contact with the ground and ensuring the stability of the rig and derrick during drilling. This technical solution not only ensures that the top drive unit can reliably connect to or disconnect the drill pipe, but also effectively protects the threads of the top drive unit and drill pipe, thereby extending the service life of the power unit and drill pipe.

[0036] like Figures 1 to 3 As shown, a power head rod change control system includes a pilot valve assembly 14, including solenoid valve 1, solenoid valve 2, solenoid valve 3, solenoid valve 9, solenoid valve 4, 10, and solenoid valve 5, 11; solenoid valve 1 is used to realize the floating of the power head 20, and solenoid valve 2, solenoid valve 3, solenoid valve 9, solenoid valve 4, 10, and solenoid valve 5 are used to control the valve core reversing of the main valve assembly 13, so as to realize the simultaneous extension or retraction of the left cylinder 4 and the right cylinder 5 of the power head 20, thereby realizing the lifting or falling of the power head 20 when changing the rod.

[0037] The main valve assembly 1 includes main valve 1 3 and main valve 2 8. Control of main valve 1 3 enables rapid lifting or lowering of the power head 20. Specifically, pilot oil flows from port P1 into the pilot valve assembly 14, then flows out through port a1 or port b1 to port a3 or port b3 of the main valve assembly 13, achieving direction switching of the main valve 1 3 oil port. Working oil flows into the main valve assembly 13 through port P2, then flows out through port A5 or port B5 to the rod chamber or rodless chamber of the left and right cylinders 4 and 5, respectively, enabling floating, rapid lifting or lowering of the power head 20.

[0038] The power head 20 is slowly tilted up or down by controlling the main valve 28. The pilot oil flows from the P1 port into the pilot valve assembly 14, and flows out through the a2 port or the b2 port to the a4 port or the b4 port of the main valve assembly 13, thereby realizing the reversal of the oil port of the main valve 28. The working oil flows into the main valve assembly 13 through the P2 port, flows out through A6 or B6, and then flows through the left throttle valve 6 or the right throttle valve 7 to the rod chamber or the rodless chamber of the left cylinder 4 and the right cylinder 5, thereby realizing the slow tilting up or down of the power head 20. The T port of the pilot valve assembly 14 and the main valve assembly 13 is connected to the oil tank through an oil pipe.

[0039] The electrical control part includes a controller 15, a control handle 16, a button 17, a button 2 18, and a selector switch 19, which are used to control the reversing of the pilot valve assembly 14; the positive pole of the DC 24V power supply is connected to the 3, 4, 5, 119, 120, and 121 terminals of the controller 15 and the 8, 8, and 3 terminals of the button 17, the button 2 18, and the selector switch 19 through a wire, and the 79, 38, 73 and 44, 45, and 28 terminals of the controller 15 are connected to the 6 terminals of the control handle 16 respectively. , 4, 1 ends and button 17, button 2 18, 9, 10, 2 ends of selection switch 19, 7, 11, 13, 10, 12 ends of controller 15 are respectively connected to the positive pole of solenoid valve 1, solenoid valve 2, solenoid valve 3, solenoid valve 4, 10, and solenoid valve 5, 11, and the negative pole of solenoid valve 1, solenoid valve 2, solenoid valve 3, solenoid valve 4, 10, and solenoid valve 5, 11 and ends 1, 2, 116, 117, 118 of controller 15 are respectively connected to the negative pole of the power supply.

[0040] The direction of the pilot valve assembly 14 is switched by the controller 15, button 17, button 2 18 and selection switch 19 to control the power head 20 to quickly rise, quickly fall, slowly rise, slowly fall and float.

[0041] The following is a detailed description of the working process: Since the drilling tower of a large deep well drilling rig is high (usually more than ten meters), heavy, and the borehole is deep (usually more than 1,000 meters), in order to ensure the stability of the drilling rig and the verticality of the borehole during operation, before work, the ground under the drilling rig chassis must be leveled and compacted, and then the front, rear, left and right legs on the four sides of the drilling rig chassis must be raised. If the ground cannot be guaranteed to be flat, the drilling rig must be leveled using the front, rear, left and right legs to ensure that it touches the ground reliably. Then, the drilling rig's working device, the drilling tower, must be erected using the handle, perpendicular to the ground. The drilling tower has an outrigger on each side, and the extension and retraction of the left and right legs are controlled by the extension and retraction of the left and right oil cylinders to ensure that the left and right legs are in stable contact with the ground.

[0042] The rig primarily consists of inner and outer rigs, a pulley frame, a back carriage, and a workbench. The inner and outer rigs slide relative to each other under the action of a feed cylinder. The inner rig houses a slideway for the power head, and the feed cylinder provides lifting and lowering force for the power head via a top pulley and wire rope. The workbench serves as the drilling platform, while the back carriage guides the rig's overall vertical movement. Driven by the back slide cylinder, the rig slides up and down along the back carriage, controlling the workbench's height above the ground.

[0043] The process of rapid lifting and lowering is as follows: When the drilling rig starts working, first, the power head must be raised to the top of the drilling tower, and the button 2 18 must be pressed, and the control handle 16 must be pushed forward. At this time, the 38 end of the controller 15 can receive a voltage change of 2.5V-5V, and the 10 end of the controller 15 outputs a changing current (200ma-700ma) to the positive pole of the solenoid valve 4 10. The greater the angle of pushing the control handle forward, the greater the voltage value received by the 38 end of the controller 15 (2.5V-5V), and the greater the current value output by the 10 end of the controller 15 (200ma-700 After the solenoid valve 4 10 is switched, the larger the opening, the pilot oil flows in from the P1 port, flows in through the solenoid valve 4 10, and then flows out from the a1 port of the pilot valve assembly 14 through the solenoid valve 2 2, and flows into the a3 port of the main valve 13 through the pipeline. The main valve 13 is switched, and the working oil flows into the main valve assembly 13 through the P2 port. After the main valve 13 is switched, it flows from the B5 port of the main valve assembly 13 to the rodless chambers of the left oil cylinder 4 and the right oil cylinder 5. The oil in the rod chambers of the left oil cylinder 4 and the right oil cylinder 5 flows into the A5 of the main valve assembly 13 and flows to the oil tank 12 through the T port. At this time, the pistons of the left oil cylinder 4 and the right oil cylinder 5 The rods are extended at the same time. After the upper end of the power head is subjected to force, the bottom is connected to the drill pipe end and gradually tilts upward from a downward vertical position (the maximum tilting angle is 85°). At this time, the winch device on the side of the drilling tower is used to lift the drill pipe fixed with a wire rope (the internal thread end is on top), or one end of the drill pipe bracket is raised to tilt the internal thread end of the drill pipe, and move the drill pipe until the tilting angle of the power head 20 is consistent with the inclination angle of the drill pipe. While moving the drill pipe, push the control handle 16 forward, and the drill collar at the front end of the power head 20 rotates clockwise until the internal thread of the drill collar is completely connected with the external thread of the drill pipe.

[0044] Continue to press button 2 18 and operate the control handle 16 backward. At this time, terminal 38 of the controller 15 can receive the voltage change of 2.5V-0V. Terminal 12 of the controller 15 outputs the changing current (200ma-700ma) to the positive pole of the solenoid valve 5 11. The greater the angle of pushing the control handle backward, the smaller the voltage value received by terminal 38 of the controller 15 (2.5V-0V), and the larger the current value output by terminal 12 of the controller 15 (200ma-700 After the solenoid valve 5 11 is switched, the larger the opening, the pilot oil flows in from the P1 port, flows in through the solenoid valve 5 11, then flows through the solenoid valve 3 9, flows out from the b1 port of the pilot valve assembly 14, and flows into the b3 port of the main valve 13 through the pipeline. The main valve 13 is switched, and the working oil flows into the main valve assembly 13 through the P2 port. After the switching, it flows from the A5 port of the main valve assembly 13 to the rod chambers of the left cylinder 4 and the right cylinder 5. The oil in the rodless chambers of the left cylinder 4 and the right cylinder 5 flows in from the B5 port of the main valve assembly 13 and flows to the oil tank 12 through the T port. At this time, the piston rods of the left cylinder 4 and the right cylinder 5 are retracted at the same time, and the power head 20 returns to the vertical state from the tilted state, realizing the rapid fall of the power head 20 until the newly connected drill pipe is vertically downward. The power head is moved downward so that the internal thread at the lower end of the drill pipe is aligned with the external thread of the drill pipe already under the ground. The newly connected drill pipe is tightened by rotating the drill collar of the power head 20 clockwise, and the power head continues to rotate clockwise while drilling downward.

[0045] If you want to achieve slow lifting or lowering of the power head 20, turn the selection switch 19 to the left, and the 28th terminal of the controller 15 receives a 24V voltage signal through the 2nd terminal of the selection switch 19. The 11th and 13th terminals of the controller 15 simultaneously output electrical signals to the positive poles of the solenoid valve 2 and the solenoid valve 3 9. The valve cores of the solenoid valve 2 and the solenoid valve 3 9 are simultaneously reversed. At this time, the power head 20 is raised to the top of the drilling tower, and the button 2 18 is pressed. The control handle 16 is pushed forward. At this time, the 38th terminal of the controller 15 can receive a voltage change of 2.5V-5V. The 10th terminal of the controller 15 outputs a changing current (200ma-700ma) to the positive pole of the solenoid valve 4 10. The greater the angle of pushing the control handle forward, the greater the voltage value received by the 38th terminal of the controller 15 (2.5V-5V), and the greater the current value output by the 10th terminal of the controller 15 (200ma-700ma). ma), the larger the opening of the solenoid valve 4 10 is after reversing, the pilot oil flows in from the P1 port of the pilot valve group 14, passes through the solenoid valve 4 10, and then through the reversing of the solenoid valve 2 2, flows out from the a2 port of the pilot valve assembly 14, and flows into the a4 port of the main valve assembly 13 through the pipeline. The main valve 2 8 is reversed, and the working oil flows into the main valve assembly 13 through the P2 port. After the main valve 2 8 is reversed, it flows from the B6 port of the main valve assembly 13 through the right throttle valve 7 into the rodless chamber of the left cylinder 4 and the right cylinder 5. The oil in the rod chamber of the left cylinder 4 and the right cylinder 5 flows through the left throttle valve 6 and the A6 of the main valve assembly 13, and flows into the oil tank 12 through the T port. At this time, the piston rods of the left cylinder 4 and the right cylinder 5 extend at the same time. Due to the left throttle valve 6 and the right throttle valve 7 can linearly adjust the flow rate of the hydraulic pipeline. Therefore, the speed at which the piston rods of the left cylinder 4 and the right cylinder 5 are extended simultaneously can be adjusted. After the upper end of the power head 20 is subjected to force, the bottom of the power head 20 is connected to the drill pipe end, and it gradually tilts upward from a downward vertical position (the maximum tilting angle is 85°). Use the hoisting device on the side of the drilling tower to lift the drill pipe fixed with a wire rope (the internal thread end is on top), or raise one end of the drill pipe bracket to tilt the internal thread end of the drill pipe, and move the drill pipe until the tilting angle of the power head 20 is consistent with the inclination angle of the drill pipe. While moving the drill pipe, push the control handle 16 forward, and the drill collar at the front end of the power head 20 rotates clockwise until the drill collar is completely connected to the drill pipe.

[0046] Continue to press button 2 18 and operate the control handle 16 backward. At this time, terminal 38 of the controller 15 can receive the voltage change of 2.5V-0V, and terminal 12 of the controller 15 outputs the changing current (200ma-700ma) to the solenoid valve 5 11. The greater the angle of pushing the control handle 16 backward, the smaller the voltage value received by terminal 38 of the controller 15 (2.5V-0V), and the larger the current value output by terminal 12 of the controller 15 (200ma-700 After the solenoid valve 5 11 is switched, the larger the opening, the more pilot oil flows in from the P1 port of the pilot valve assembly 14, flows in through the solenoid valve 5 11, then switches through the solenoid valve 3 9, flows out from the b2 port of the pilot valve assembly 14, and flows into the b4 port of the main valve 13 through the pipeline. The main valve 2 8 switches, and the working oil flows into the main valve assembly 13 through the P2 port. After the main valve 2 8 switches, it flows out from the A6 port of the main valve assembly 13, and then flows into the rod chambers of the left cylinder 4 and the right cylinder 5 through the left throttle valve 6. The oil in the rodless chambers of the left cylinder 4 and the right cylinder 5 flows through the right throttle valve 7, flows into the B6 port of the main valve assembly 13, and flows to the oil tank 12 through the T port. At this time, the piston rods of the left cylinder 4 and the right cylinder 5 are retracted at the same time. Since the left throttle valve 6 and the right throttle valve 7 can linearly adjust the flow rate of the hydraulic pipeline, the retraction speed of the piston rods of the left cylinder 4 and the right cylinder 5 can be adjusted at the same time. The power head 20 returns to the vertical state from the tilted state, realizing the slow fall of the power head 20. The internal thread at the lower end of the newly connected drill pipe is aligned with the external thread of the drill pipe already under the ground. The newly connected drill pipe is tightened by rotating the drill collar of the power head 20 clockwise, and the power head continues to rotate clockwise while drilling downward.

[0047] The floating process of the power head is as follows: when the external thread of the newly connected drill pipe is connected to the internal thread of the power head 20, the internal thread end of the newly connected drill pipe is still in contact with the ground. At this time, the tilted power head 20 is connected to the newly connected drill pipe while being slowly lifted upward. In order to protect the internal thread of the power head 20 and the external thread of the newly connected drill pipe, the oil in the rod chamber of the left oil cylinder 4 and the right oil cylinder 5 needs to be connected to the oil in the rodless chamber to keep the power head 20 in a floating state. At this time, operate the control handle 16 forward or backward, press button 1 17 and button 2 18 at the same time, and the 44 end of the controller 15 After receiving the electrical signal, terminal 7 outputs the electrical signal to the positive electrode of the solenoid valve 1, and the pilot oil flows in from the P1 port of the pilot valve assembly 14. After the solenoid valve 1 is reversed, it flows out from the a1 port of the pilot valve assembly 14 to the a3 port of the main valve 3. The valve core of the main valve 3 is reversed, and the working oil flows into the main valve 3 through the P2 port. At this time, the working oil of P2 is connected to the T port of the main valve 3, and the oil in the rod cavity and the rodless cavity of the left cylinder 4 and the right cylinder 5 is connected. The power head 20 is in a floating state during the upward operation, which effectively protects the external thread of the newly connected drill pipe and the internal thread of the power head 20.

[0048] As can be seen from the above structure, the present invention effectively ensures that the top driving head can reliably and flexibly connect or remove the drill pipe through electrical and hydraulic control of the machinery, while also effectively protecting the top driving head and the drill pipe threads, thereby extending the service life of the power head and the drill pipe.

[0049] The present application also discloses a drilling rig, which includes any one of the rod changing control systems described above.

[0050] It is understood from common technical knowledge that the present invention may be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the embodiments disclosed above are, in all respects, merely illustrative and not exclusive. All modifications within the scope of the present invention or equivalent to the scope of the present invention are intended to be encompassed by the present invention.

Claims

1. A rod change control system, characterized in that: include: The main valve assembly (13) includes a main valve (3), wherein the main valve (3) is connected to the oil inlet P2, the first working oil port of the main valve (3) is connected to the rod chamber of the left oil cylinder (4) and the rod chamber of the right oil cylinder (5), and the second working oil port of the main valve (3) is connected to the rodless chamber of the left oil cylinder (4) and the rodless chamber of the right oil cylinder (5); the piston rods of the left oil cylinder (4) and the right oil cylinder (5) are both connected to the power head (20); The pilot valve assembly (14) comprises a solenoid valve 2 (2) and a solenoid valve 3 (9) for controlling the switching of the main valve 1 (3), wherein the solenoid valve 2 (2) is connected to the a3 port of the main valve 1 (3), and the solenoid valve 3 (9) is connected to the b3 port of the main valve 1 (3); a solenoid valve 4 (10) is connected between the solenoid valve 2 (2) and the oil inlet P1, and a solenoid valve 5 (11) is connected between the solenoid valve 3 (9) and the oil inlet P1; The control component includes a controller (15), wherein the controller (15) is configured to control the reversing of the solenoid valve 4 (10) and the solenoid valve 5 (11) according to the received electrical signal; The main valve assembly (13) further includes a main valve 2 (8) connected to the oil inlet P2, a port a4 of the main valve 2 (8) connected to the solenoid valve 2 (2), and a port b4 of the main valve 2 (8) connected to the solenoid valve 3 (9); A left throttle valve (6) is provided between the first working oil port of the second main valve (8) and the rod chamber of the left oil cylinder (4) and the rod chamber of the right oil cylinder (5); a right throttle valve (7) is provided between the second working oil port of the second main valve (8) and the rodless chamber of the left oil cylinder (4) and the rodless chamber of the right oil cylinder (5); The controller (15) is configured to control the switching of the second solenoid valve (2) and the third solenoid valve (9) according to the received electrical signal.

2. The lever change control system according to claim 1, characterized in that: The pilot valve assembly (14) further includes a solenoid valve 1 (1) connected between the oil inlet P1 and the port a3 of the main valve 1 (3); The controller (15) is configured to control the reversing of the solenoid valve (1) according to the received electrical signal so that the oil inlet P2 is connected to the oil return port T of the main valve (3), thereby connecting the rod chamber and the rodless chamber of the left cylinder (4) and the right cylinder (5) to each other, thereby realizing floating control of the power head.

3. The lever change control system according to any one of claims 1 to 2, characterized in that: The rod chamber and the rodless chamber of the left oil cylinder (4) and the rod chamber and the rodless chamber of the right oil cylinder (5) are all connected to the oil return port T.

4. The lever change control system according to claim 1, characterized in that: It also includes a control handle (16) connected to the controller (15) by signal and a second button (18) having an enabling function; The controller (15) is configured to control the size of the reversing openings of the solenoid valve four (10) and the solenoid valve five (11) according to the signal of the button two (18) and the rotation angle of the control handle (16); the greater the angle of the forward rotation of the control handle (16), the larger the reversing opening of the solenoid valve four (10) controlled by the controller (15); and the greater the angle of the backward rotation of the control handle (16), the larger the reversing opening of the solenoid valve five (11) controlled by the controller (15).

5. The lever change control system according to claim 1, characterized in that: It also includes a selection switch (19) connected to the controller (15), and the controller (15) is configured to control the switching of the solenoid valve 2 (2) and the solenoid valve 3 (9) according to the signal of the selection switch (19).

6. The lever change control system according to claim 2, characterized in that: The invention also includes a control handle (16), a button 1 (17), and a button 2 (18) having an enabling function, which are connected to the controller (15) signal. The controller (15) is configured to control the reversing of the solenoid valve 1 (1) according to the signal of the button 1 (17), the signal of the button 2 (18), and the rotation angle of the control handle (16).

7. The lever change control system according to claim 1, characterized in that: The main valve 1 (3) is a four-position six-way reversing valve.

8. The lever change control system according to claim 1, characterized in that: The main valve 2 (8) is a three-position six-way reversing valve.

9. A drilling rig, characterized in that: The invention comprises the rod change control system according to any one of claims 1 to 8.

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