Drilling machine hydraulic double-driving-force driving system and working method

Abstract

The invention discloses a drilling machine hydraulic double-driving-force driving system and a working method. The system comprises a diesel power station, a motor power station, a hydraulic pump, a hydraulic control one-way valve, a sequence valve, a two-way refueling pump, a liquid level sensor, a controller and the like. A diesel engine or a motor is selected to start to drive a hydraulic pump to operate according to working condition requirements, high-pressure oil is output as a pilot oil source to open a hydraulic control one-way valve, and a sequence valve is arranged on an oil inlet path to ensure that the hydraulic control one-way valve is opened firstly to avoid return oil pressure building; and meanwhile, the two-way refueling pump and the liquid level sensor are matched with the controller to realize automatic adjustment of the liquid levels of the two oil tanks. Flexible switching between the two power sources of the diesel engine and the motor can be achieved, the adaptability and working efficiency of the drilling machine hydraulic system are improved, and stable operation of the system is guaranteed.

Description

Technical Field

[0001] This invention belongs to the technical field of drilling rig hydraulic systems, and relates to a dual-power drive and method for a drilling rig hydraulic system. Background Technology

[0002] In the conventional design of drilling rig hydraulic systems, a power unit is typically used to drive the hydraulic pump to provide a high-pressure oil source. Common power sources are diesel engines and electric motors.

[0003] Diesel engine drives offer advantages such as eliminating the need for external cables and providing flexible driving methods, making them particularly advantageous in situations requiring high mobility and where power access is inconvenient. However, when drilling rigs operate in enclosed or semi-enclosed environments such as mine tunnels and pits, diesel engine exhaust generates severe pollution problems. Simultaneously, the engine releases a large amount of heat during operation, causing a sharp rise in ambient temperature. This not only affects the lifespan and performance of the equipment but also poses a threat to the health of operators.

[0004] Electric motor drives are favored for their high efficiency, energy saving, and environmental friendliness. They can reduce energy consumption and environmental pollution, meeting the requirements of modern industry for sustainable development. However, in some special working conditions, such as when drilling rigs need to travel long distances, electric motor drives need to drag cables, which not only increases the complexity and difficulty of operation but may also cause safety hazards due to cable entanglement and pulling.

[0005] Therefore, the existing hydraulic system power drive method of drilling rig has obvious limitations and cannot meet the needs of different working conditions at the same time. There is an urgent need for a dual power drive solution that can take into account the advantages of diesel engines and electric motors. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a hydraulic dual-drive system and operating method for drilling rigs. This system overcomes the limitations of existing hydraulic systems driven by a single power source, enabling flexible switching between diesel engines and electric motors. This improves the adaptability and efficiency of the hydraulic system, while preventing oil blockage in the return oil circuit or oil level imbalance in the tank due to leakage, thus ensuring stable system operation.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A hydraulic dual-drive force drive system for drilling rigs, comprising: A diesel power station, including a diesel engine and its associated control devices, is used to drive a hydraulic pump; The motor power unit, including the motor and frequency converter, is used to drive the hydraulic pump; A hydraulic pump is the power component of a hydraulic system; A hydraulically controlled check valve is installed on the return oil line to control the direction of hydraulic oil return. A sequence valve is installed on each oil inlet line to control the opening sequence of the oil circuit; the opening pressure of the sequence valve is set to be slightly higher than the opening pressure of the hydraulic check valve. A two-way fuel pump connects the fuel tanks of a diesel power station and an electric motor power station, and is used to transfer fuel between the two tanks. Liquid level sensors are installed in the fuel tanks of the diesel power station and the electric motor power station, respectively, to monitor the liquid level in the fuel tanks in real time; The controller receives the liquid level signal transmitted by the liquid level sensor and sends operation commands to the bidirectional refueling pump according to the preset upper and lower liquid level limits. Hydraulic cylinders and hydraulic motors, as actuators, convert hydraulic energy into mechanical energy to drive the various moving parts of the drilling rig.

[0009] The power source selection and starting method of the hydraulic dual-drive system of the drilling rig includes: selecting to start the diesel power station or the electric motor power station according to the actual working conditions. Start the diesel power station: Press the start button of the diesel engine. After the diesel engine starts, it drives the hydraulic pump to start running. The hydraulic pump outputs high-pressure oil. A portion of the high-pressure oil is used as a pilot oil source and transmitted to the control port of the hydraulic control check valve corresponding to the diesel power station to open the hydraulic control check valve. Start the motor power station: send a start signal to the frequency converter, and the frequency converter gradually increases the output frequency and voltage according to the preset start curve, driving the motor to start rotating; the motor drives the hydraulic pump to run, the hydraulic pump outputs high-pressure oil, forming a pilot oil source and opening the corresponding hydraulic control check valve.

[0010] The oil flow control method for the hydraulic dual-drive system of the drilling rig includes: Oil inlet control: In the initial stage of oil inlet, the sequence valve is in the closed state. When the pump pressure gradually increases and reaches the opening pressure of the hydraulic control check valve, the hydraulic control check valve opens first. As the pressure further increases and reaches the opening pressure of the sequence valve, the sequence valve opens and the system enters the normal working state. The oil inlet flow rate is adjusted according to the load requirements by adjusting the displacement of the hydraulic pump or the pressure regulating valve of the system. Oil return and drain control: Hydraulic oil flowing from the hydraulic cylinder and hydraulic motor returns to the corresponding oil tank through the open hydraulic control check valve; since the hydraulic control check valve is already open when the pump starts, it avoids back pressure caused by the delayed opening of the hydraulic control check valve in the oil return circuit, and prevents the drain line from being damaged by back pressure.

[0011] The method for adjusting the fluid level and handling cross-contamination in the hydraulic dual-drive system of the drilling rig includes: Liquid level monitoring: The liquid level sensor monitors the liquid level in the fuel tanks of the diesel power station and the electric motor power station in real time and transmits the liquid level signal to the controller; Liquid level judgment and control: The controller uses a PID algorithm to process the received liquid level signal and compare it with the preset upper and lower liquid level limits; If the fuel level in the diesel power station tank reaches the preset upper limit and the fuel level in the electric motor power station tank reaches the preset lower limit, the controller sends a forward operation command to the bidirectional refueling pump. The bidirectional refueling pump pumps fuel from the diesel power station tank to the electric motor power station tank, lowering the fuel level in the diesel power station tank and raising the fuel level in the electric motor power station tank. If the oil level in the motor power station tank reaches the preset upper limit and the oil level in the diesel power station tank reaches the preset lower limit, the controller sends a reverse operation command to the bidirectional refueling pump, which then pumps oil from the motor power station tank to the diesel power station tank. When the liquid levels in both tanks are within the normal range, the bidirectional refueling pump stops operating.

[0012] The operation and monitoring method of the drilling rig hydraulic dual-drive system includes: during system operation, monitoring various system parameters in real time through the control panel, including the pressure and flow rate of the hydraulic pump and the oil level in the tank; at the same time, the system is equipped with overload protection and overheat protection, and when the system malfunctions, it can issue an alarm in time and take corresponding protective measures to ensure the safe operation of the system.

[0013] Compared with the prior art, the present invention has the following technical effects: This invention offers flexible power switching: switching between different power sources is achieved through hydraulic locks and pilot oil source logic control. It allows for flexible selection of diesel engine or electric motor drive based on actual working conditions, fully leveraging the advantages of both drive methods. This solves the pollution and high-temperature problems of diesel engine drive while overcoming the inconvenience of electric motor drive during long-distance travel.

[0014] The system of this invention has high stability: a sequence valve is added to each oil inlet line to ensure that the hydraulic control check valve opens before the sequence valve when the pump pressure rises. This effectively avoids the problem of pressure buildup in the return oil caused by the delayed opening of the hydraulic control check valve in the return oil line, protects the drain line and motor, and improves the reliability and safety of the system.

[0015] This invention features automatic liquid level balancing: by using a bidirectional oil pump and a liquid level sensor in conjunction with a controller's PID algorithm, the liquid levels in the two hydraulic tanks are automatically adjusted, ensuring the normal operation of the hydraulic system and reducing manual intervention and maintenance costs. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the overall structure of the dual-power drive system of the drilling rig's hydraulic system.

[0017] Figure 2 This is an enlarged schematic diagram of the sequence valve and hydraulic control check valve of the dual-power drive system of the drilling rig hydraulic system.

[0018] Figure 3 This is an enlarged schematic diagram of the sequence valve and hydraulic control check valve of the dual-power drive system of the drilling rig hydraulic system after they are opened.

[0019] Figure 4 The diagram shows the direction of hydraulic oil flow when the dual-power drive system supplies oil to the drilling rig hydraulic system (when powered by an electric motor).

[0020] Figure 5 This is a schematic diagram of the hydraulic oil flow direction when the dual-power drive system of the drilling rig returns oil to the system (when powered by a motor).

[0021] The meanings of the labels in the diagram are as follows: 1. Diesel power station, 2. Electric motor power station, 3. Hydraulic pump, 4. Hydraulic check valve, 5. Sequence valve, 6. Two-way refueling pump, 7. Liquid level sensor, 8. Hydraulic cylinder, 9. Hydraulic motor. Detailed Implementation

[0022] This invention provides a hydraulic dual-drive force drive system for drilling rigs, comprising: Diesel power station 1 includes a diesel engine and its supporting control device, used to drive hydraulic pump 3; The motor power station 2 includes a motor and a frequency converter, which is used to drive the hydraulic pump 3; Hydraulic pump 3 is the power component of the hydraulic system; The hydraulic control check valve 4 is installed on the return oil line to control the return direction of the hydraulic oil and ensure that the hydraulic oil can smoothly return to the corresponding oil tank. Sequence valve 5 is installed in each oil inlet line to control the opening sequence of the oil circuit, ensuring that when the pump pressure increases, the hydraulic control check valve opens before the sequence valve; the opening pressure of sequence valve 5 is set to be slightly higher than the opening pressure of hydraulic control check valve 4. The two-way fuel pump 6 connects the fuel tanks of the diesel power station 1 and the electric motor power station 2, and is used to transfer fuel between the two fuel tanks to regulate the liquid level. The liquid level sensor 7 is installed in the fuel tanks of the diesel power station 1 and the electric motor power station 2 respectively, and is used to monitor the liquid level in the fuel tanks in real time. The controller receives the liquid level signal transmitted by the liquid level sensor 7 and sends an operation command to the bidirectional refueling pump 6 according to the preset upper and lower liquid level limits. Hydraulic cylinder 8 and hydraulic motor 9, as actuators, convert hydraulic energy into mechanical energy to drive the various moving parts of the drilling rig.

[0023] The present invention provides a method for selecting and starting the power source of the hydraulic dual-drive system for drilling rigs, comprising: the operator selecting to start the diesel power station or the electric motor power station through the control panel or corresponding operating device according to the actual working conditions; Starting the diesel power station: The operator presses the start button of the diesel engine. After the diesel engine starts, it drives the hydraulic pump to start running. The hydraulic pump outputs high-pressure oil. A portion of the high-pressure oil is used as a pilot oil source and transmitted to the control port of the hydraulic control check valve (hydraulic lock) corresponding to the diesel power station. The pressure of the pilot oil source acts on the control piston of the hydraulic control check valve, overcoming the spring force and opening the hydraulic control check valve. Starting the motor power station: The operator sends a start signal to the frequency converter through the start button on the control cabinet. The frequency converter gradually increases the output frequency and voltage according to the preset start curve, driving the motor to start rotating. The motor drives the hydraulic pump to run, and the hydraulic pump outputs high-pressure oil to form a pilot oil source and open the corresponding hydraulic control check valve (hydraulic lock).

[0024] The present invention provides a method for controlling the oil flow in a hydraulic dual-drive system for drilling rigs, comprising: Oil inlet control: by Figure 2 As shown, in the initial stage of oil inlet, the sequence valve is in the closed state. As the pump pressure gradually increases and reaches the opening pressure of the hydraulic check valve, the sequence valve is opened. Figure 3 As shown, the hydraulic check valve opens first, ensuring that hydraulic oil can smoothly enter the inlet chamber of the actuator, protecting the critical components of the hydraulic system. As the pressure further increases, when it reaches the opening pressure of the sequence valve, the sequence valve opens, and the system enters normal operation. The oil flow rate is adjusted according to the load demand by regulating the displacement of the hydraulic pump or the system's pressure regulating valve. The direction of oil flow is from... Figure 4 As shown (when powered by a motor); Oil return and drain control: by Figure 5 As shown (when powered by the motor), the hydraulic oil flowing out from the hydraulic cylinder and hydraulic motor returns to the corresponding oil tank through the open hydraulic control check valve. Since the hydraulic control check valve is already open when the pump starts, the problem of pressure buildup in the return oil circuit caused by the delayed opening of the hydraulic control check valve is avoided, and the motor is prevented from being damaged by pressure buildup in the drain line.

[0025] Since both hydraulic stations can provide oil supply and return / discharge for the drilling rig, oil leakage may occur during operation through the valve body. Although the leakage flow is small, to prevent hydraulic oil from overflowing into a tank or being too low and affecting the normal operation of the system, a bidirectional refueling pump between the diesel power station and the electric motor power station is installed in the pump station. The present invention provides a method for level regulation and leakage handling in the hydraulic dual-drive system of the drilling rig, comprising: Liquid level monitoring: The liquid level sensor monitors the liquid level in the fuel tanks of the diesel power station and the electric motor power station in real time and transmits the liquid level signal to the controller; Liquid level judgment and control: The controller uses a PID algorithm to process the received liquid level signal and compare it with the preset upper and lower liquid level limits; If the liquid level reaches the preset upper or lower limit, the controller will send an operation command to the bidirectional refueling pump to drain or replenish oil as needed, thereby automatically adjusting the liquid levels in the two tanks to maintain balance. Specifically: If the fuel level in the diesel power station tank reaches the preset upper limit and the fuel level in the electric motor power station tank reaches the preset lower limit, the controller sends a forward operation command to the bidirectional refueling pump. The bidirectional refueling pump pumps fuel from the diesel power station tank to the electric motor power station tank, lowering the fuel level in the diesel power station tank and raising the fuel level in the electric motor power station tank. If the oil level in the motor power station tank reaches the preset upper limit and the oil level in the diesel power station tank reaches the preset lower limit, the controller sends a reverse operation command to the bidirectional refueling pump, which then pumps oil from the motor power station tank to the diesel power station tank. When the liquid levels in both tanks are within the normal range, the bidirectional refueling pump stops operating.

[0026] The present invention provides a method for operating and monitoring a hydraulic dual-drive system for drilling rigs, comprising: during system operation, operators can monitor various system parameters in real time through the control panel, including the pressure and flow rate of the hydraulic pump, and the liquid level in the oil tank; at the same time, the system is equipped with safety devices such as overload protection and overheat protection, and can issue alarms and take corresponding protective measures in a timely manner when abnormal conditions occur in the system, so as to ensure the safe operation of the system.

[0027] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0028] Example 1: This embodiment is applied in the practical application of dual-power drive switching and liquid level regulation in a mining tunnel operation scenario, including: (1) Equipment composition and initial state: In this embodiment, the drilling rig's hydraulic system is equipped with a 200kW explosion-proof three-phase asynchronous motor and a 220kW diesel engine as dual power sources. The hydraulic pump is an axial piston pump with a rated flow rate of 300L / min and a rated pressure of 35MPa. The system has two independent hydraulic oil tanks: one for the electric motor power station and one for the diesel power station, each with a capacity of 800L. In the inlet pipeline, the hydraulically controlled check valve is a Rexroth LC10A10E7X model, and the sequence valve is a Rexroth DZ10DP2-5X / 210XYM model. The bidirectional oil pump is a gear pump with a rated flow rate of 20L / min, controlled by a Siemens S7-1200 PLC controller. Each of the two oil tanks is equipped with an E+H FMP40 hydrostatic level sensor with a measurement accuracy of ±1mm. Initially, both the electric motor and diesel engine are stopped, and the hydraulic check valve is closed to prevent hydraulic oil backflow. Both oil tanks are at the neutral level (400L). The PLC controller has preset upper limit for the hydraulic level of 600L and lower limit of 200L. (2) Motor-driven start-up process: When the drilling rig needs to perform short-distance, fixed-position operations within the mine tunnels, the operator starts the motor via the control cabinet. After starting, the motor drives the hydraulic pump, which then outputs high-pressure oil. Part of this high-pressure oil serves as the working fluid, driving the hydraulic cylinders and motor. The other part acts as a pilot oil source, entering the control port of the hydraulically controlled check valve. When the pilot oil pressure reaches the opening pressure of the hydraulically controlled check valve (5 MPa in this embodiment), the check valve opens rapidly, providing a pathway for the return and discharge of oil from the hydraulic cylinders and motor, allowing the hydraulic oil flowing from them to smoothly return to the motor power station's oil tank. In the oil inlet line, because the set pressure of the sequence valve (8MPa in this embodiment) is higher than the opening pressure of the hydraulic control check valve, when the hydraulic pump pressure increases, the hydraulic control check valve opens first, avoiding the problem of back pressure buildup and effectively protecting the hydraulic motor and other hydraulic components. At this time, the drilling rig's hydraulic system operates stably with the help of the motor, driving the drill bit to perform drilling operations. (3) The process of switching from electric motor power to diesel power: When the drilling rig needs to move long distances within the mine tunnels, the inconvenience of dragging cables due to the need for motor drive necessitates switching to diesel power. The operator first stops the motor via the control cabinet. After the motor stops, the hydraulic pump ceases outputting high-pressure oil, the hydraulic check valve closes, and the oil circuit connection between the motor power station's oil tank and the hydraulic system is severed. Subsequently, the operator started the diesel engine, which drove the hydraulic pump to output high-pressure oil. Similarly, a portion of this high-pressure oil served as a pilot oil source, opening the corresponding hydraulic check valve of the diesel power station, allowing the return and drain oil from the hydraulic system to flow back to the diesel power station's fuel tank. Simultaneously, a sequence valve in the inlet line ensured that the hydraulic check valve opened first, preventing back pressure buildup. Throughout the entire switching process, due to the use of a hydraulic lock and pilot oil source logic control, manual oil circuit switching was unnecessary, resulting in a rapid and stable switching process that ensured the continuity of drilling operations. (4) Liquid level adjustment process: During drilling rig operation, oil leakage may occur between the two hydraulic stations through the valve bodies. Assuming that during diesel power operation, the level sensor in the electric motor power station's oil tank detects a rise in the oil level to 600L (reaching the preset upper limit), the sensor transmits the signal to the PLC controller. Upon receiving the signal, the PLC controller immediately sends a command to the bidirectional refueling pump, starting it to transfer excess hydraulic oil from the electric motor power station's tank to the diesel power station's tank. When the oil level in the electric motor power station's tank drops to 550L, the PLC controller sends a stop command to the bidirectional refueling pump, causing it to stop operating. Conversely, if the level sensor in the diesel power station's fuel tank detects that the fuel level has dropped to 200L (reaching the preset lower limit), the PLC controller will also control the bidirectional refueling pump to start, replenishing the hydraulic oil from the motor power station's fuel tank to the diesel power station's fuel tank, until the fuel level in the diesel power station's fuel tank rises to 250L and then stops. This achieves automatic adjustment of the fuel levels in both tanks, ensuring the normal and stable operation of the hydraulic system.

[0029] Example 2: This embodiment is applied in the practical application of dual-power drive and liquid level regulation optimization in tunnel construction scenarios, including: (1) Equipment configuration adjustment: In tunnel construction scenarios, considering the high requirements for noise and environmental protection within the tunnel, a variable frequency motor with a rated power of 180kW and a low-noise diesel engine with a rated power of 200kW were selected. The hydraulic pump is a variable vane pump with a maximum flow rate of 250L / min and a working pressure range of 5-30MPa. The two hydraulic oil tanks are adjusted to 600L in volume. The pilot-operated check valve is a SUN LCFC-XDN model, and the sequence valve is a SUN RDBA-XAN model. The bidirectional refueling pump is a screw pump with a rated flow rate of 15L / min. The PLC controller was upgraded to a Siemens S7-1500, and the level sensor is an Endress+Hauser FTL51 tuning fork level switch, which features high reliability and stability.

[0030] (2) Dual-power coordinated operation and switching: In the initial stage of tunnel construction, the drilling rig operates from a fixed position, prioritizing the start of the variable frequency motor. The variable frequency motor adjusts its speed via a frequency converter, and the hydraulic pump's output flow and pressure are adjusted in real-time according to the drilling load, achieving energy-saving operation. Once the hydraulically controlled check valve opens under the action of the pilot oil, the hydraulic system operates normally.

[0031] As tunnel construction progresses, when the drilling rig needs to be moved, the operator uses a switching button on the control cabinet to first reduce the speed of the variable frequency motor, gradually lowering the hydraulic system pressure, and then stopping the motor. Next, the diesel engine is started, driving the hydraulic pump to build up pressure and open the corresponding hydraulic check valve, completing the power switch. During the switching process, the sequence valve ensures that the hydraulic check valve opens first, guaranteeing smooth oil return. (3) Intelligent liquid level regulation: A more refined liquid level control strategy is set in the PLC controller. In addition to the preset upper limit of 500L and lower limit of 150L, ​​a warning liquid level is also set. When the liquid level reaches 450L (approaching the upper limit warning) or 180L (approaching the lower limit warning), the PLC controller will remind the operator through an audible and visual alarm device. When the actual liquid level reaches the upper or lower limit, the bidirectional refueling pump starts to regulate the liquid level. Simultaneously, the PLC controller predicts future liquid level changes based on the liquid level trends in both tanks, adjusting the operating frequency and timing of the bidirectional refueling pump in advance to achieve more precise liquid level control. This further improves the stability and reliability of the hydraulic system, meeting the high stability requirements of the drilling rig's hydraulic system during tunnel construction.

[0032] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0033] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0034] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A hydraulic dual-drive force drive system for drilling rigs, characterized in that, include: The diesel power station (1) includes a diesel engine and its supporting control device for driving the hydraulic pump (3). The motor power station (2) includes a motor and a frequency converter, which is used to drive the hydraulic pump (3). The hydraulic pump (3) is the power component of the hydraulic system; A hydraulic control check valve (4) is installed on the return oil line to control the return direction of hydraulic oil. Sequence valve (5) is installed on each oil inlet line to control the opening sequence of the oil circuit; the opening pressure of sequence valve (5) is set to be slightly higher than the opening pressure of hydraulic control check valve (4); A two-way fuel pump (6) is connected to the fuel tanks of the diesel power station (1) and the electric motor power station (2) for transferring fuel between the two fuel tanks; The liquid level sensor (7) is installed in the oil tanks of the diesel power station (1) and the electric motor power station (2) respectively, and is used to monitor the liquid level in the oil tank in real time; The controller receives the liquid level signal transmitted by the liquid level sensor (7) and sends an operation command to the bidirectional refueling pump (6) according to the preset upper and lower limits of the liquid level. Hydraulic cylinders (8) and hydraulic motors (9), as actuators, convert hydraulic energy into mechanical energy to drive the various moving parts of the drilling rig.

2. The method for selecting and starting the power source of the hydraulic dual-drive system for drilling rigs as described in claim 1, characterized in that, include: Choose to start the diesel power station or the electric motor power station according to the actual working conditions. Start the diesel power station: Press the start button of the diesel engine. After the diesel engine starts, it drives the hydraulic pump to start running. The hydraulic pump outputs high-pressure oil. A portion of the high-pressure oil is used as a pilot oil source and transmitted to the control port of the hydraulic control check valve corresponding to the diesel power station to open the hydraulic control check valve. Start the motor power station: send a start signal to the frequency converter, and the frequency converter gradually increases the output frequency and voltage according to the preset start curve, driving the motor to start rotating; the motor drives the hydraulic pump to run, the hydraulic pump outputs high-pressure oil, forming a pilot oil source and opening the corresponding hydraulic control check valve.

3. The oil flow control method for the hydraulic dual-drive force drive system of the drilling rig as described in claim 1, characterized in that, include: Oil inlet control: In the initial stage of oil inlet, the sequence valve is in the closed state. When the pump pressure gradually increases and reaches the opening pressure of the hydraulic control check valve, the hydraulic control check valve opens first. As the pressure further increases and reaches the opening pressure of the sequence valve, the sequence valve opens and the system enters the normal working state. The oil inlet flow rate is adjusted according to the load requirements by adjusting the displacement of the hydraulic pump or the pressure regulating valve of the system. Oil return and drain control: Hydraulic oil flowing from the hydraulic cylinder and hydraulic motor returns to the corresponding oil tank through the open hydraulic control check valve; since the hydraulic control check valve is already open when the pump starts, it avoids back pressure caused by the delayed opening of the hydraulic control check valve in the oil return circuit, and prevents the drain line from being damaged by back pressure.

4. The method for level adjustment and oil leakage treatment of the hydraulic dual-drive system for drilling rigs as described in claim 1, characterized in that, include: Liquid level monitoring: The liquid level sensor monitors the liquid level in the fuel tanks of the diesel power station and the electric motor power station in real time and transmits the liquid level signal to the controller; Liquid level judgment and control: The controller uses a PID algorithm to process the received liquid level signal and compare it with the preset upper and lower liquid level limits; If the fuel level in the diesel power station tank reaches the preset upper limit and the fuel level in the electric motor power station tank reaches the preset lower limit, the controller sends a forward operation command to the bidirectional refueling pump. The bidirectional refueling pump pumps fuel from the diesel power station tank to the electric motor power station tank, lowering the fuel level in the diesel power station tank and raising the fuel level in the electric motor power station tank. If the oil level in the motor power station tank reaches the preset upper limit and the oil level in the diesel power station tank reaches the preset lower limit, the controller sends a reverse operation command to the bidirectional refueling pump, which then pumps oil from the motor power station tank to the diesel power station tank. When the liquid levels in both tanks are within the normal range, the bidirectional refueling pump stops operating.

5. The method for operating and monitoring the hydraulic dual-drive force drive system of the drilling rig as described in claim 1, characterized in that, include: During system operation, various system parameters, including hydraulic pump pressure and flow rate, and oil tank level, are monitored in real time via the control panel. The system is also equipped with overload and overheat protection. In case of any abnormalities, the system will issue an alarm and take appropriate protective measures to ensure safe operation.

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