Auxiliary oil return control system and method and drilling machine

Abstract

The invention discloses an auxiliary oil return control system, an auxiliary oil return control method and a drilling machine in the technical field of engineering machinery, and aims to solve the problems that in the prior art, the pressure building phenomenon often occurs, danger is brought to work of the drilling machine, and the safety of the system is affected. The hydraulic system comprises a main valve and a pump, a port A of the main valve is connected with a rod cavity of a first oil cylinder and a rod cavity of a second oil cylinder at the same time, and a port B of the main valve is connected with a rodless cavity of the first oil cylinder and a rodless cavity of the second oil cylinder at the same time; the control assembly comprises a port P2, a port A1 and a port B, a port P of the pump is connected with the port P2, and a rodless cavity of the first oil cylinder and a rodless cavity of the second oil cylinder are both connected with the port A1; the port A1 and the port B of the control assembly can be communicated, so that part of oil in the rodless cavity of the first oil cylinder and the rodless cavity of the second oil cylinder flows into the oil tank through the control assembly, it is guaranteed that the oil flows out stably, the pressure building condition is prevented, and the stability and safety of the hydraulic system during working are guaranteed.

Description

Technical Field

[0001] This invention relates to an auxiliary oil return control system, method, and drilling rig, belonging to the field of engineering machinery technology. Background Technology

[0002] Deep well drilling rigs are specialized equipment for shallow resource extraction, primarily used for drilling and extracting resources such as coalbed methane, shale gas, shallow oil, geothermal energy, and groundwater. They offer advantages such as large borehole diameter and high drilling efficiency, and are also used in special applications such as mine rescue and gas extraction. The drilling rig mainly consists of inner and outer drilling towers, a pulley frame, and a back slide. Under the action of the feed cylinder, the inner and outer drilling towers slide relative to each other. The inner drilling tower has a movement track for the power head. The feed cylinder provides lifting and downward pressure to the power head through the top pulley and wire rope. The back slide serves as the guiding mechanism for the overall vertical movement of the drilling rig. While the top drive head moves up and down on the drilling rig under the action of hydraulic cylinders and wire ropes, the hydraulic motor drives the top drive head to rotate the drill bit, drill rod, and other drilling tools, cutting and breaking the rock strata to achieve rock drilling and hole formation. An air compressor or mud pump, connected to the air / mud manifold, uses pressure to expel rock cuttings from the well to the surface. Drilling depths range from several hundred meters to over 3000 meters. The applicant's research has found the following problems with the current drilling rig during construction: In existing control systems, after drilling a well is completed, the drill pipe needs to be removed from the well. To improve work efficiency, the power head needs to move rapidly downwards from the top of the drilling rig to connect to the downhole drill pipe. At this time, oil enters the rod chamber (small chamber) of the drilling rig cylinder and returns oil to the rodless chamber (large chamber). When the power head is lowered, especially rapidly, pressure buildup often occurs. Even if the feed handle has returned to the neutral position, the power head will still move upwards for a distance after stopping, which poses a danger to the drilling rig and affects the safety of the system. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an auxiliary oil return control system, method and drilling rig. Through the cooperation of pump and control component, when oil enters the rod chamber of cylinder one and cylinder two and oil returns from the rodless chamber, port A1 and port B of the control component can be connected, so that part of the oil in the rodless chamber of cylinder one and cylinder two flows into the oil tank through the control component, ensuring the smooth flow of oil, preventing pressure buildup, and ensuring the stability and safety of the application during operation.

[0004] To solve the above-mentioned technical problems, the present invention is implemented using the following technical solution: In a first aspect, the present invention provides an auxiliary oil return control system, including a main valve and a pump, wherein port A of the main valve is simultaneously connected to the rod chamber of cylinder one and the rod chamber of cylinder two, and port B of the main valve is simultaneously connected to the rodless chamber of cylinder one and the rodless chamber of cylinder two. The control component includes port P2, port A1, and port B. The P port of the pump is connected to the P2 port. The rodless chambers of cylinder one and cylinder two are both connected to port A1. Port B is connected to the oil tank. The pump is used to control the on / off state of ports A1 and B.

[0005] Furthermore, the control assembly also includes a solenoid valve, a hydraulic directional valve, and a t-port. The t-port is connected to the oil tank. The first port of the hydraulic directional valve is connected to the A1 port. The second port of the hydraulic directional valve is connected to the B port. The first port of the solenoid valve is connected to the P2 port. The second port of the solenoid valve is connected to the t-port. The third port of the solenoid valve is connected to the control port of the hydraulic directional valve. The return port of the solenoid valve is connected to the t-port.

[0006] Furthermore, the pump's P port is connected to the P2 port via a pressure reducing valve.

[0007] Furthermore, both the rodless chamber of the first hydraulic cylinder and the rodless chamber of the second hydraulic cylinder are connected to the sensor.

[0008] Furthermore, it also includes an electrical control system, which includes a controller and a handle, both of which are electrically connected to the controller.

[0009] Furthermore, the solenoid valve is provided with a coil for controlling the swivel of the solenoid valve core, and the coil is electrically connected to the controller.

[0010] Furthermore, the handle is provided with a first button and a second button, both of which are electrically connected to the controller.

[0011] In a second aspect, the present invention provides an auxiliary oil return control method, based on the auxiliary oil return control system described in the first aspect, including uplift control; The rise control includes: The staff member pushed the handle forward; The main valve outputs oil to the rodless chamber of cylinder one and the rodless chamber of cylinder two. The oil in the rod chamber of cylinder one and the rod chamber of cylinder two flows into the main valve, completing the lifting control.

[0012] Furthermore, this also includes descent control; The descent control includes: The staff member pushed the handle backward; The main valve outputs oil to the rod chamber of cylinder one and the rod chamber of cylinder two; The controller controls the switching of the solenoid valve spool; The oil output from the pump flows through the solenoid valve into the control port of the hydraulic directional valve, connecting port A1 with port B. A portion of the oil in the rodless chamber of cylinder one and cylinder two flows into the main valve, while another portion of the oil in the rodless chambers of cylinder one and cylinder two flows into the oil tank through ports A1 and B, thus completing the descent control.

[0013] Thirdly, the present invention provides a drilling rig including the auxiliary oil return control system described in the first aspect.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: This auxiliary oil return control system, through the cooperation of a pump and a control component, connects port A1 and port B of the control component when oil enters the rod chamber of cylinder one and cylinder two and oil returns from the rodless chamber. This allows a portion of the oil in the rodless chamber of cylinder one and cylinder two to flow into the oil tank through the control component, ensuring a smooth flow of oil, preventing pressure buildup, and guaranteeing the stability and safety of the application during operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an auxiliary oil return control system according to an embodiment of the present invention; Figure 2 This is a system schematic diagram of an electrical control system provided according to an embodiment of the present invention.

[0016] In the diagram: 1. Controller; 2. Sensor; 3. Handle; 4. Button 1; 5. Button 2; 6. Coil; 7. Oil tank; 8. Pump; 9. Pressure reducing valve; 10. Main valve; 11. Cylinder 1; 12. Cylinder 2; 13. Solenoid valve; 14. Hydraulic directional valve. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances. Example 1:

[0020] like Figures 1-2 As shown, the present invention provides an auxiliary oil return control system, including a main valve 10 and a pump 8. The A port of the main valve 10 is connected to the rod chamber of both cylinder 11 and cylinder 12, and the B port of the main valve 10 is connected to the rodless chamber of both cylinder 11 and cylinder 12. The control component includes a P2 port, an A1 port, and a B port. The P port of the pump 8 is connected to the P2 port, the rodless chambers of both cylinder 11 and cylinder 12 are connected to the A1 port, and the B port is connected to the oil tank 7. The pump 8 is used to control the on / off state of the A1 port and the B port.

[0021] In some possible embodiments, the drilling rig mainly consists of a traveling chassis, working devices (including a drilling tower, top drive head, tool winch, unhooking device, and mud manifold), power, hydraulic, and electrical systems. The drilling tower mainly consists of inner and outer drilling towers, pulley frames, and a back slide. Under the action of the feed cylinder, the inner and outer drilling towers slide relative to each other. The inner drilling tower has a movement slide for the power head. The feed cylinder provides lifting and downward pressure to the power head through the top pulley and wire rope. The back slide is a guide mechanism for the overall up-and-down movement of the drilling tower. Under the action of the hydraulic cylinder and wire rope, the top drive head moves up and down in the drilling tower. At the same time, the hydraulic motor drives the top drive head to rotate the drill bit, drill rod, and other drilling tools to cut and break the rock formation, thereby achieving rock drilling and hole formation. The air / mud manifold is externally connected to an air compressor or mud pump to discharge the rock cuttings from the well to the surface through pressure.

[0022] Specifically, during operation, when the drilling rig is controlled to ascend, the main valve 10 operates, supplying oil through its port B into the rodless chambers of cylinder 11 and cylinder 12. The oil in the rod chambers of cylinder 11 and 12 returns to the main valve 10 through its port A. Since the rodless chamber (larger chamber) receives oil and the rod chamber (smaller chamber) receives oil, the oil flow is smooth, completing the ascent control. When the drilling rig needs to be controlled to descend, the main valve 10 supplies oil through its port A into the rod chambers of cylinder 11 and 12. The oil in the rodless chambers of cylinder 11 and 12 returns to the main valve 10 through its port B. In the main valve 10, oil enters through the rod chamber (small chamber) and returns through the rodless chamber (large chamber). Since the cross-sectional area of ​​the rod chamber is smaller than that of the rodless chamber, a large amount of oil flows back to port B of the main valve 10 from cylinders 11 and 12, causing pressure buildup. At this time, the control pump 8 starts working and inputs oil into port P2 of the control component, thereby connecting port A1 and port B of the control component. At this time, some oil in the rodless chambers of cylinders 11 and 12 can flow into the oil tank 7 through ports A1 and B, achieving a smooth flow of oil from the rodless chambers of cylinders 11 and 12, preventing pressure buildup, and ensuring the stability and safety of the application during operation.

[0023] This application, through the cooperation of pump 8 and control component, allows oil to enter the rod chamber of cylinder 11 and cylinder 22 and return oil to the rodless chamber. This enables the A1 port and B port of the control component to be connected, allowing a portion of the oil in the rodless chamber of cylinder 11 and cylinder 22 to flow into the oil tank 7 through the control component. This ensures a smooth flow of oil, prevents pressure buildup, and guarantees the stability and safety of this application during operation.

[0024] In this embodiment, the control component further includes a solenoid valve 13, a hydraulic directional valve 14, and a t-port. The t-port is connected to the oil tank 7. The first port of the hydraulic directional valve 14 is connected to the A1 port, the second port of the hydraulic directional valve 14 is connected to the B port, the first port of the solenoid valve 13 is connected to the P2 port, the second port of the solenoid valve 13 is connected to the t-port, the third port of the solenoid valve 13 is connected to the control port of the hydraulic directional valve 14, and the return port of the solenoid valve 13 is connected to the t-port. The P-port of the pump 8 is connected to the P2 port through a pressure reducing valve 9.

[0025] Specifically, when it is necessary to control the on / off state of ports A1 and B of the control component, pump 8 starts working, inputting oil into the first port of solenoid valve 13. The operator controls solenoid valve 13 to switch according to actual work needs, so that the first port of solenoid valve 13 is connected to the third port. At this time, the oil output by pump 8 can flow through solenoid valve 13 to the control port of hydraulic directional valve 14, thereby controlling hydraulic directional valve 14 to switch, so that ports A1 and B of the control component are connected. Optionally, port P of pump 8 is connected to port P2 through pressure reducing valve 9, and the pressure of the oil circuit can be adjusted by pressure reducing valve 9 to ensure the stability of the operation of this application.

[0026] In this embodiment, the rodless chamber of cylinder 11 and the rodless chamber of cylinder 2 are both connected to sensor 2, and the oil pressure flowing out of the rodless chamber of cylinder 11 and cylinder 2 can be detected by sensor 2.

[0027] In this embodiment, an electrical control system is also included. The electrical control system includes a controller 1 and a handle 3. The sensor 2 and the handle 3 are both electrically connected to the controller 1. The solenoid valve 13 is provided with a coil 6 for controlling the switching of the valve core of the solenoid valve 13. The coil 6 is electrically connected to the controller 1. The handle 3 is provided with a first button 4 and a second button 5. Both the first button 4 and the second button 5 are electrically connected to the controller 1.

[0028] Specifically, the different working states of the drilling rig can be switched by the combination of handle 3, button 4, and button 5, and coil 6 is used to control the reversing of the valve core of solenoid valve 13.

[0029] In some possible embodiments, Figure 1P3 is the third port of solenoid valve 13, and P4 is the control port of hydraulic directional valve 14. This application realizes the lifting and feeding of the drilling rig power head by extending or retracting the rods of cylinder 11 and cylinder 2. Controller 1 receives input signals and outputs control signals to electrical components. Controller 1 is a commercially available Wika T4775D controller. Handle 3 is used to lift and lower the power head. Button 1 4 and Button 2 5 are used to realize the safe lifting, lowering and rapid operation of the power head. Button 1 4 and Button 2 5 are integrated on the side and top of handle 3, respectively. Coil 6 is the coil inside solenoid valve 13. According to the energization or de-energization of coil 6, the valve core inside solenoid valve 13 is switched, thereby realizing the switching of oil. The positive terminal of the DC24V power supply is connected via wires to terminals 201, 202, 203, 204, 205, 206, and 227 of controller 1 and the positive terminal of sensor 2. Terminals 101, 102, 103, 116, 224, 225, and 226 of controller 1 are connected to the negative terminal of the power supply. Terminal S of sensor 2 is connected to terminal 134 of controller 1. The positive terminals of handle 3, button 1 4, and button 2 5 are connected via wires to terminal 104 of controller 1. Terminal S1 and the negative terminal of handle 3 are connected to terminals 138 and 159 of controller 1. Terminal a of button 1 4 and terminal b of button 2 5 are connected to terminals 221 and 222 of controller 1. Terminal 228 of controller 1 is connected to the positive terminal of coil 6, and the negative terminal of coil 6 is connected to the negative terminal of the power supply.

[0030] Specifically, when the operator presses button 4 and pushes handle 3 forward, the B port of the main valve 10 outputs pressurized oil to the rodless chambers and A1 port of cylinders 11 and 12, and the detection port of sensor 2. Oil from the rod chambers of cylinders 11 and 12 flows into the A port of the main valve 10, causing the rods of cylinders 11 and 12 to extend. Since oil enters through the rodless chambers and returns through the rod chambers, the oil flow is smooth, and the top drive head moves upward until it reaches the top of the inner drilling rig. The greater the angle at which handle 3 is pushed forward, the faster the top drive head moves upward. At this time, the tool winch, unlatcher, and power head... Rotate and connect drill rods and other drilling tools; at this time, press button 4 and push handle 3 backward, while simultaneously operating the rotating handle. The top driving head rotates and moves downward. The greater the angle of pushing handle 3 backward, the faster the top driving head moves downward, until the connected drill rod is drilled into the ground. At this time, the A port of the main valve 10 outputs pressurized oil to the rod chamber of cylinder 11 and cylinder 22. The oil in the rodless chamber of cylinder 11 and cylinder 22 flows into the B port of the main valve 10, and the rods of cylinder 11 and cylinder 22 retract. Since oil enters the rod chamber of cylinder 11 and cylinder 22 and oil returns from the rodless chamber, the cross-sectional area of ​​the rod chamber is smaller than that of the rodless chamber. When the oil flowing back to port B of the main valve 10 from cylinders 11 and 12 is excessive and pressurized, the controller 1 outputs an electrical signal to the positive terminal of coil 6 at terminal 228. The solenoid valve 13 then reverses direction, allowing the oil output from pump 8 to flow through port P to port P1 of pressure reducing valve 9, then through port A to port P2, and finally through the third port of solenoid valve 13 to the control port of hydraulic directional valve 14. The hydraulic directional valve 14 then becomes internally conductive, allowing some oil from the rodless chambers of cylinders 11 and 12 to flow into the oil tank 7 through port B. The oil from the rodless chambers of cylinders 11 and 12 then flows out smoothly, enabling the power head to drill downwards smoothly. Since pressure reducing valve 9 can adjust the oil flow... The pressure of the road is such that the conduction pressure of the hydraulic directional valve 14 can be adjusted as needed. Since the oil flowing out of the rodless chamber of cylinder 11 and cylinder 212 has a certain pressure, the pressure detected by sensor 2 can be displayed on the screen. For example, when the return oil pressure is greater than 200Pa, the 228 terminal of controller 1 outputs an electrical signal to coil 6 to realize the switching of solenoid valve 13, thereby realizing that part of the oil in the rodless chamber of cylinder 11 and cylinder 212 flows to oil tank 7, preventing cylinder 11 and cylinder 212 from moving upward due to poor return oil flow after the handle 3 suddenly stops. Repeat the above work to continue connecting new drill pipes for drilling until drilling is completed.

[0031] After drilling is completed, the drill pipes need to be lifted and removed from the well one by one. When button 4 is pressed and handle 3 is pushed forward, the B port of the main valve 10 outputs pressurized oil to the rodless chambers and A1 port of cylinders 11 and 12, as well as the detection port of sensor 2. The oil in the rod chambers of cylinders 11 and 12 flows back to the A port of the main valve 10, and the rods of cylinders 11 and 12 extend. Since oil enters from the rodless chambers of cylinders 11 and 12 and returns from the rod chambers, the oil flow is smooth, and the top drive head moves upward until it reaches the top of the inner drilling rig. The greater the angle of pushing handle 3 forward, the stronger the top drive head becomes. The faster the power head moves upward, the more the upper and lower clamps of the uncoupling device grip the upper and lower connected drill pipes. Through the rotation of the uncoupling cylinder and the power head, the threads connecting the two drill pipes and the drill pipes to the power head collar are unscrewed. Then, the disassembled drill pipes are hoisted to an open area for later use by a winch. Because the wellhead is relatively deep, usually several hundred to several thousand meters, there are about 200 to 400 drill pipes downhole. The height of the drill tower cylinder after it is fully extended is about ten meters. Therefore, the power head moves downward to a height of about ten meters. In order to save time and improve work efficiency, the unloaded power head at a high position needs to be lowered quickly.

[0032] At this point, press button 4 and button 5, and push handle 3 backward. The top drive head will move downward quickly. The greater the angle of pushing handle 3 backward, the faster the top drive head will move downward until it reaches the bottom of the drill tower and connects to the drill rod below. At this time, the A port of the main valve 10 outputs pressurized oil to the rod chambers of cylinder 11 and cylinder 12. The oil in the rodless chambers of cylinder 11 and cylinder 12 flows into the B port of the main valve 10. The rods of cylinder 11 and cylinder 12 retract. Since it is cylinder 11... Oil enters the rod chamber of cylinder 11 and cylinder 212, and returns oil to the rodless chamber. The cross-sectional area of ​​the rod chamber is smaller than that of the rodless chamber. A large amount of oil flows back to port B of the main valve 10 from cylinders 11 and 12, causing pressure buildup. At this time, the controller 1 outputs an electrical signal from terminal 228 to the positive terminal of coil 6, causing solenoid valve 13 to switch. The oil output from pump 8 flows through port P to port P1 of pressure reducing valve 9, then through port A to port P2, and finally through solenoid valve 13 to port P4 of hydraulic directional valve 14, thus opening the hydraulic directional valve 14 internally. Part of the oil in the rodless chambers of cylinders 11 and 12 flows into the oil tank 7 through port A1 of the hydraulic directional valve 14 and then through port B. The oil in the rodless chambers of cylinders 11 and 12 flows out smoothly, thus enabling the power head to drill downwards smoothly. Since the pressure reducing valve 9 can adjust the oil pressure, and the oil flowing out of the rodless chambers of cylinders 11 and 12 has a certain pressure, the conduction pressure of the hydraulic directional valve 14 can be adjusted as needed. The oil flowing out of the cavity has a certain pressure. Therefore, the pressure detected by sensor 2 can be displayed on the screen. For example, when the return oil pressure is greater than 200Pa, the 228 terminal of controller 1 outputs an electrical signal to coil 6 to realize the switching of solenoid valve 13. This allows part of the oil in the rodless chamber of cylinder 11 and cylinder 2 to flow to oil tank 7, preventing the power head from moving upwards due to poor return oil flow when handle 3 suddenly stops. Repeat the above operation until all drill pipes downhole are removed. Example 2:

[0033] This invention provides an auxiliary oil return control method, based on the auxiliary oil return control system described in Embodiment 1, including rise control; The rise control includes: The staff member pushes handle 3 forward; The main valve 10 outputs oil to the rodless chamber of cylinder 11 and cylinder 2 12. The oil in the rod chamber of cylinder 11 and cylinder 2 12 flows into the main valve 10, completing the lifting control.

[0034] It also includes descent control; The descent control includes: The staff member pushed the handle 3 backward; The main valve 10 outputs oil to the rod chamber of cylinder 11 and the rod chamber of cylinder 2; Controller 1 controls the switching of the valve core of solenoid valve 13; The oil output from pump 8 flows into the control port of hydraulic directional valve 14 through solenoid valve 13, so that port A1 is connected to port B. A portion of the oil in the rodless chamber of cylinder 11 and cylinder 12 flows into the main valve 10, while the remaining portion of the oil in the rodless chambers of cylinder 11 and cylinder 12 flows into the oil tank 7 through ports A1 and B, thus completing the descent control. Example 3:

[0035] The present invention provides a drilling rig, including the auxiliary oil return control system described in Embodiment 1.

[0036] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An auxiliary oil return control system, characterized in that, Includes a main valve (10) and a pump (8). The A port of the main valve (10) is connected to the rod chamber of cylinder one (11) and the rod chamber of cylinder two (12) at the same time. The B port of the main valve (10) is connected to the rodless chamber of cylinder one (11) and the rodless chamber of cylinder two (12) at the same time. The control component includes port P2, port A1 and port B. Port P of the pump (8) is connected to port P2. The rodless chamber of cylinder one (11) and the rodless chamber of cylinder two (12) are both connected to port A1. Port B is connected to the oil tank (7). The pump (8) is used to control the on / off state of port A1 and port B.

2. The auxiliary oil return control system according to claim 1, characterized in that, The control assembly also includes a solenoid valve (13), a hydraulic directional valve (14), and a t port. The t port is connected to the oil tank (7). The first port of the hydraulic directional valve (14) is connected to the A1 port. The second port of the hydraulic directional valve (14) is connected to the B port. The first port of the solenoid valve (13) is connected to the P2 port. The second port of the solenoid valve (13) is connected to the t port. The third port of the solenoid valve (13) is connected to the control port of the hydraulic directional valve (14). The return port of the solenoid valve (13) is connected to the t port.

3. The auxiliary oil return control system according to claim 1, characterized in that, The P port of the pump (8) is connected to the P2 port through a pressure reducing valve (9).

4. The auxiliary oil return control system according to claim 2, characterized in that, The rodless chamber of the first cylinder (11) and the rodless chamber of the second cylinder (12) are both connected to the sensor (2).

5. The auxiliary oil return control system according to claim 4, characterized in that, It also includes an electrical control system, which includes a controller (1) and a handle (3), and the sensor (2) and the handle (3) are both electrically connected to the controller (1).

6. The auxiliary oil return control system according to claim 5, characterized in that, The solenoid valve (13) is provided with a coil (6) for controlling the switching of the valve core of the solenoid valve (13), and the coil (6) is electrically connected to the controller (1).

7. The auxiliary oil return control system according to claim 5, characterized in that, The handle (3) is provided with a first button (4) and a second button (5), both of which are electrically connected to the controller (1).

8. An auxiliary oil return control method, based on the auxiliary oil return control system according to any one of claims 5 to 7, characterized in that, Including upward control; The rise control includes: The staff member pushes the handle forward (3); The main valve (10) outputs oil to the rodless chamber of cylinder one (11) and the rodless chamber of cylinder two (12). The oil in the rod chamber of cylinder one (11) and the rod chamber of cylinder two (12) flows into the main valve (10) to complete the lifting control.

9. The auxiliary oil return control method according to claim 8, characterized in that, It also includes descent control; The descent control includes: The staff pushed the handle backward (3); The main valve (10) outputs oil to the rod chamber of cylinder one (11) and the rod chamber of cylinder two (12); The controller (1) controls the valve core reversal of the solenoid valve (13); The oil output by pump (8) flows into the control port of hydraulic directional valve (14) through solenoid valve (13), so that port A1 is connected to port B; A portion of the oil in the rodless chamber of cylinder 1 (11) and cylinder 2 (12) flows into the main valve (10), while another portion of the oil in the rodless chamber of cylinder 1 (11) and cylinder 2 (12) flows into the oil tank (7) through port A1 and port B, thus completing the descent control.

10. A drilling rig, characterized in that, Includes the auxiliary oil return control system as described in any one of claims 1 to 7.

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