Control method of rotary drilling rig

Abstract

The present application provides a rotary drilling rig power system, the rotary drilling rig power system includes an execution unit, a fuel power unit, a battery power unit and an external power interface, the fuel power unit, the battery power unit and the external power interface are all electrically connected to the execution unit, and are used to selectively provide power to the execution unit. The present application also provides a rotary drilling rig control method for the rotary drilling rig power system, and a rotary drilling rig including the rotary drilling rig power system.

Description

Technical Field

[0001] The invention relates to the field of mechanical control, and in particular to a rotary drilling rig control method. Background Art

[0002] A rotary drilling rig is a commonly used type of engineering machinery. In a traditional rotary drilling rig, the following power system structure is usually adopted: a fuel engine is used as a power source, the output end flywheel of the fuel engine is connected to the input end of the transfer case, the first output shaft of the transfer case is connected to the input end of the hydraulic main pump, the second output shaft of the transfer case is connected to the input end of the hydraulic auxiliary pump, the hydraulic main pump and the hydraulic auxiliary pump are connected to the corresponding hydraulic valves, hydraulic cylinders and hydraulic motors through hydraulic pipelines, and the hydraulic pump controller is connected to the hydraulic valve controller through hydraulic pipelines or circuits.

[0003] The control method of the above power system is usually as follows: after the driver inputs the instruction containing his needs, the hydraulic valve controller adjusts the switches of each hydraulic valve and the flow of each hydraulic pump according to the instruction, and changes the flow direction and flow of the hydraulic oil circuit according to the needs. At the same time, after the hydraulic pipeline is connected, the oil pressure required by the hydraulic oil can be determined according to the load size, and the required oil pressure can be fed back to the hydraulic pump; the flow and pressure required by the hydraulic pump can be determined according to the required oil pressure, and then the torque and power required by the power system can be determined; the required torque and power are fed back to the transfer case, and then fed back to the engine by the transfer case, so as to control the engine to adjust the injection amount according to the required torque and power to achieve appropriate energy output.

[0004] In the above rotary drilling rig power system, the fuel injection amount and speed of the engine will change with the actual working conditions. It can be seen from the universal curve of the engine that the overall thermal efficiency will be maintained at a high level only when the engine speed and fuel injection amount are within the ideal range. Under other working conditions, the overall thermal efficiency will be at a low level, and the engine cannot be maintained at the highest point of fuel economy, which will lead to increased fuel consumption and increased emissions of pollutants such as carbon dioxide.

[0005] Therefore, it is necessary to provide a more novel rotary drilling rig power system, a rotary drilling rig control method and a rotary drilling rig to effectively solve the problems of high fuel consumption and high pollutant emissions of traditional rotary drilling rigs. Summary of the invention

[0006] In view of this, an object of the present invention is to provide a rotary drilling rig control method which has higher energy utilization, is safer and more environmentally friendly than the prior art.

[0007] A preferred embodiment of the present application provides a rotary drilling rig control method for a rotary drilling rig power system, wherein the rotary drilling rig power system includes an executive unit, a fuel power unit, a battery power unit and an external power supply interface, and the fuel power unit, the battery power unit and the external power supply interface are all electrically connected to the executive unit; the battery power unit includes a power battery pack; the fuel power unit includes a fuel tank, an engine range extender and a generator, the engine range extender is connected to the fuel tank, and the generator is transmission-connected to the engine range extender; the rotary drilling rig control method includes the following steps: S1, starting the rotary drilling rig power system; S2, determining the power source of the executive unit of the rotary drilling rig power system from the fuel power unit, the battery power unit and the external power supply interface of the rotary drilling rig power system; S3, controlling the determined power source to provide power to the executive unit of the rotary drilling rig power system.

[0008] In some embodiments, the battery power unit includes a power battery pack, and the fuel power unit includes an engine range extender; the step S2 includes: if it is determined that the external power interface is connected to an external power supply, determining that the external power interface is a power source; if it is determined that the external power interface is not connected to an external power supply, detecting the power level of the power battery pack, and if the power level of the power battery pack is not lower than a preset power supply threshold, determining that the power battery pack is a power source; if the power level of the power battery pack is lower than a preset power supply threshold, determining that the engine range extender is a power source.

[0009] In some embodiments, step S2 also includes: when determining that the external power supply interface is a power source, further determining whether the power provided by the external power supply through the external power supply interface is greater than the power required by the execution unit; if so, using the remaining power portion of the power provided by the external power supply through the external power supply interface that is greater than the power required by the execution unit to charge the power battery pack.

[0010] In some embodiments, step S3 includes: defining four working conditions of the rotary drilling rig including the power system of the rotary drilling rig, namely, walking, rotation, pressurization, and extraction, as representative working conditions, and defining the required power of the four representative working conditions as P 行走 , P 回转 , P 加压 , P 起拔 When it is determined that the engine range extender is the power source, the speed and power of the engine range extender are set to constant values, so that the engine range extender maintains a stable operation at the working point with the highest efficiency to drive the generator to generate electricity and provide power for the execution unit, and the power generation power of the generator at this time is defined as P 发电机 By adjusting the speed and power of the engine range extender, the power generation power P of the generator发电机 Adjust to P 回转＜ P 发电机 <P 行走 .

[0011] In some embodiments, the step S3 further includes: when the rotary drilling rig is in any of the three working conditions of rotation, pressurization, and extraction, the power generation power P of the generator is 发电机 The excess power of the rotary drilling rig that exceeds the power consumed by the rotary drilling rig is used to charge the power battery pack; when the rotary drilling rig is in a walking condition, the power battery pack is used to provide power to supplement the power generation power P of the generator. 发电机 The difference between the power consumed by the rotary drilling rig.

[0012] In some embodiments, the rotary drilling rig control method further includes the following steps: when the rotary drilling rig including the rotary drilling rig power system is braked or decelerated, power supply to the actuator is stopped, and the battery power unit is charged using the actuator.

[0013] Compared with the prior art, the rotary drilling rig control system and the corresponding rotary drilling rig control method provided by the above preferred embodiment of the present invention can use the electricity provided by an external power source directly as power, can also use its own power battery pack to provide power, and can also use fuel-fired power generation as power through an engine range extender. When using an external power source or a power battery pack to provide power, the engine does not need to work; and when using fuel-fired power generation as power, the corresponding operations in the above rotary drilling rig control method can keep the engine working at the best working point with the highest efficiency to supply power. In this way, the engine can be set to either not work or always work at high efficiency. Compared with the prior art, it can effectively improve fuel economy, reduce fuel consumption, and reduce the emission of pollutants such as carbon dioxide. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 A functional module block diagram of a rotary drilling rig power system provided as a preferred embodiment of the present application.

[0016] Figure 2 A flowchart of a rotary drilling rig control method provided as a preferred embodiment of the present application. DETAILED DESCRIPTION

[0017] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the description of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1 A preferred embodiment of the present application provides a rotary drilling rig power system. The rotary drilling rig power system includes an executive unit 10, a fuel power unit 20, a battery power unit 30 and an external power interface 40. The fuel power unit 20, the battery power unit 30 and the external power interface 40 are all electrically connected to the executive unit 10, and are used to respectively provide power to the executive unit 10 to drive the executive unit 10 to perform rotary drilling work. In this embodiment, the fuel power unit 20, the battery power unit 30 and the external power interface 40 are preferably configured to selectively provide power to the executive unit 10, that is, when any one of the three is selected to provide power to the executive unit 10, the other two will not be used to provide power to the executive unit 10.

[0019] Specifically, the execution unit 10 may include a power distribution unit (PDU) 11, a first power converter 12, a motor 13 and an actuator 14. The PDU 11 may be, for example, a vehicle power controller on an engineering vehicle, which is electrically connected to the fuel power unit 20 and the battery power unit 30, respectively, and can receive power supply voltages from the fuel power unit 20 and the battery power unit 30 separately or simultaneously as a power source for the rotary drilling rig. The first power converter 12 is preferably a direct current / alternating current (DC / AC) controller in this embodiment, which is electrically connected to the PDU 11 and is used to convert the power supply voltage received by the PDU 11 from a direct current voltage to an alternating current voltage. The motor 13 is preferably a permanent magnet synchronous motor in this embodiment, which is electrically connected to the first power converter 12, and the alternating current voltage generated by the first power converter 12 can be provided to the motor 13 to drive its operation. The actuator 14 may be an existing rotary drilling rig actuator, such as a drill bit and its transmission mechanism, which is transmission-connected to the output shaft of the motor 13, and can perform rotary drilling work under the drive of the motor 13.

[0020] The fuel power unit 20 may include a fuel tank 21, an engine range extender 22, a generator 23, and a second power converter 24. The fuel tank 21 is used to contain fuel, and the fuel inlet and the oil return port of the engine range extender 22 are connected to the fuel tank 21, and are used to obtain fuel from the fuel tank 21 and burn the fuel to generate power. In this embodiment, the generator 23 is preferably a permanent magnet synchronous generator, which is drivingly connected to the output shaft of the engine range extender 22, and can generate electricity by obtaining power from the engine range extender 22. In this embodiment, the second power converter 24 is preferably an AC / DC controller, which is electrically connected between the generator 23 and the PDU11, and is used to convert the AC voltage generated by the generator 23 into a DC voltage, and provide it to the PDU11 as the power supply voltage provided by the fuel power unit 20.

[0021] The battery power unit 30 may include a power battery pack 31. The power battery pack 31 is electrically connected to the PDU 11, and is used to provide a DC voltage to the PDU 11 as a power supply voltage provided by the battery power unit 30. The battery power unit 30 may also include a third power converter 32 and a battery 33. The third power converter 32 is preferably a DC / DC controller in this embodiment, which is electrically connected between the power battery pack 31 and the battery 33, and can be used to adjust the voltage of the power battery pack 31 to a required range and then charge the battery 33 when the power of the power battery pack 31 exceeds the working demand. The battery 33 is preferably a low-voltage battery, which can be used to provide working power to an engineering vehicle equipped with a rotary drilling rig.

[0022] The external power interface 40 is electrically connected to the PDU 11. The external power interface 40 can be used to connect an external power source such as an existing power supply grid, especially a high-voltage cable, and after obtaining the external power supply voltage, it is converted into a working voltage suitable for the execution unit 10 through, for example, an existing AC-DC conversion method, and provided to the PDU 11 as power.

[0023] See also Figure 2 Another preferred embodiment of the present application provides a rotary drilling rig control method, which can be implemented by the rotary drilling rig power system described above. Specifically, the rotary drilling rig power method may include the following steps.

[0024] S1, starting the power system of the rotary drilling rig.

[0025] The step S1 may specifically include the following operations: starting the entire engineering vehicle equipped with the rotary drilling rig, connecting the circuits of various components in the power system of the rotary drilling rig, and collecting and summarizing initialization information signals of various components. These operations can be performed according to existing methods and need not be described in detail here.

[0026] S2, determining a power source of an execution part of the rotary drilling rig power system from a fuel power part, a battery power part and an external power supply interface of the rotary drilling rig power system.

[0027] This step S2 may specifically include the following operations: the operator inputs a work instruction to the power system of the rotary drilling rig according to usage requirements, such as the electric power requirements of the rotary drilling rig; the work instruction is transmitted to PDU11, and PDU11 detects a power signal, such as an external power signal or a battery power signal, and then selects a power source for powering the rotary drilling rig according to the detection result, that is, determines whether the rotary drilling rig is powered by the fuel power unit 20, the battery power unit 30 or the external power interface 40. Specifically in the present embodiment, the above-mentioned detection and selection operation steps are preferably: first, the external power supply signal is detected to determine whether the external power supply interface 40 is connected to an external power supply. If it can be determined according to the detection result that the external power supply interface 40 is connected to an external power supply such as a high-voltage cable, it is determined to use the external power supply interface 40 as a power source for power supply; if it is determined that the external power supply interface 40 is not connected to an external power supply, the power level of the power battery pack 31 is detected. If it can be determined according to the detection result that the power level of the power battery pack 31 is not lower than the preset power supply threshold, it is determined to use the power battery pack 31 in the battery power unit 30 as the power source for power supply; if it is determined that the power level of the power battery pack 31 is already lower than the preset power supply threshold, it is determined to use the engine range extender 22 in the fuel power unit 20 as the power source for power supply.

[0028] Preferably, in step S2, when it is determined that the external power interface 40 is used as a power source for power supply, the following operations may be further performed: determining whether the power provided by the external power supply through the external power interface 40 is greater than the power required by the execution unit 10; if so, simultaneously using the remaining power portion of the power provided by the external power supply through the external power interface 40 that is greater than the power required by the execution unit 10 to charge the power battery pack 31, so as to further improve energy utilization. When charging the power battery pack 31 in this case, the charging current path may be selected to convert the working voltage obtained from the external power interface 40 into a charging voltage through the PDU 11 and provide it to the power battery pack 31.

[0029] S3, controlling the determined power source to provide power to the actuator of the rotary drilling rig power system.

[0030] After the power source is selected, the selected power source can be controlled to supply power to the execution part to provide power. This step can specifically include the following operations.

[0031] As described above, when the external power interface 40 is not connected to an external power source and the power level of the power battery pack 31 is not lower than the power supply threshold, the power battery pack 31 is selected to supply power, and the engine range extender 22 is controlled to stop working. Specifically, the power battery pack 31 can be controlled by the PDU 11 to supply power. For example, the PDU 11 can judge the execution condition and the actual required power of the whole machine according to the operator's instructions and the running load of the motor 13, and feed back the required power to the battery management system (Battery Managementy System, BMS) of the power battery pack 31. The BMS can monitor and adjust the power supply parameters such as the discharge current, voltage, discharge depth, and battery temperature of the power battery pack 31 according to the fed-back power data, and supply power according to the power demand while maintaining the consistency between the single cells in the power battery pack 31.

[0032] When the external power interface 40 is not connected to an external power source and the power level of the power battery pack 31 is lower than the power supply threshold, the engine range extender 22 is selected to supply power.

[0033] In a further preferred embodiment, when the engine range extender 22 is selected for power supply, the following operations can be further performed to ensure power supply and improve energy utilization.

[0034] First, we define four common working conditions of rotary drilling rigs: walking, rotating, pressurizing, and pulling out as representative working conditions, and define the required power under these four representative working conditions as P 行走 , P 回转 , P 加压 , P 起拔 , the working time is defined as T 行走 , T 回转 , T 加压 , T 起拔 According to the statistical data known in the art, it can be known that in most cases P 行走 ≈3*P 回转 ≈5*P 起拔 ≈40*P 加压 ,

[0035] Based on the above rules, in this embodiment, when the engine range extender 22 is selected for power supply, the speed and power of the engine range extender 22 are preferably set to constant values, so that the engine range extender 22 maintains stable operation at the optimal working point where the engine has the highest efficiency, and drives the generator 23 to generate electricity. In this case, the generator 23 will also generate electricity at the corresponding constant power. At this time, the constant power generation of the generator 23 is defined as P 发电机 .

[0036] Afterwards, the constant power generation power P of the generator 23 is adjusted by adjusting the speed and power of the engine range extender 22. 发电机 Adjust to P 回转＜ P 发电机＜ P 行走 Thus, when the rotary drilling rig is in any of the three working conditions of rotation, pressurization, and extraction, the power generation power P of the generator 23 is 发电机 It will be higher than the power consumed by the rotary drilling rig, ensuring that the rotary drilling rig gets sufficient power supply during operation.

[0037] Based on the above operations, in a further preferred embodiment, the following operations may also be included: when the rotary drilling rig is in any of the three working conditions of rotation, pressurization, and extraction, the power generation power P of the generator is increased. 发电机 The excess power of the rotary drilling rig over the power consumed by the rotary drilling rig is used to charge the power battery pack 31; and when the rotary drilling rig is in the walking condition, the power generation power P of the generator 23 发电机 The power consumed by the rotary drilling rig is lower than that of the rotary drilling rig. At this time, the power battery pack 31 is used to supplement the power generated by the generator 23. 发电机 The difference between the power consumed by the rotary drilling rig and the power consumed by the rotary drilling rig. In actual operation, the time when the rotary drilling rig is in the walking state usually accounts for only about 5% of the total working time, so generally only a short period of power replenishment is required, which will not cause excessive additional power consumption of the power battery pack 31. Through these operations, the power supply of the rotary drilling rig can be better guaranteed and the energy utilization rate can be improved.

[0038] As described above, the rotary drilling rig control system and the corresponding rotary drilling rig control method provided by the embodiment of the present application can use the electricity provided by an external power source directly as power, can also use its own power battery pack to provide power, and can also use fuel-fired power generation as power through an engine range extender. When using an external power source or a power battery pack to provide power, the engine does not need to work; and when using fuel-fired power generation as power, the corresponding operations in the above-mentioned rotary drilling rig control method can keep the engine working at the optimal working point with the highest efficiency to supply power. In this way, the engine can be set to either not work or always work at high efficiency. Compared with the prior art, it can effectively improve fuel economy, reduce fuel consumption, and reduce the emission of pollutants such as carbon dioxide.

[0039] In a further preferred embodiment, the above-mentioned rotary drilling rig control method may further include the following steps: when the rotary drilling rig is braked or decelerated, the fuel power unit 20, the battery power unit 30 or the external power supply interface 40 is controlled to stop supplying power to the actuator 10, and at the same time, the actuator 14 is used to drive the rotor of the motor 13 to rotate, so as to generate magnetic flux lines cutting on the stator coil of the motor 13, generate induced electromotive force, and reversely charge the power battery pack 31 through the PDU11 to achieve partial energy recovery and save energy.

[0040] A preferred embodiment of another aspect of the present application also provides a rotary drilling rig, which includes the rotary drilling rig power system provided by the aforementioned preferred embodiment, and is preferably used on an engineering vehicle.

[0041] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A rotary drilling rig control method, used for a rotary drilling rig power system, wherein the rotary drilling rig power system comprises an executive unit, a fuel power unit, a battery power unit and an external power interface, wherein the fuel power unit, the battery power unit and the external power interface are all electrically connected to the executive unit; the battery power unit comprises a power battery pack; the fuel power unit comprises a fuel tank, an engine range extender and a generator, wherein the engine range extender is connected to the fuel tank, and the generator is connected to the engine range extender by transmission; characterized in that The rotary drilling rig control method comprises the following steps: S1, starting the rotary drilling rig power system; S2, determining the power source of the execution unit from the fuel power unit, the battery power unit, and the external power interface, including: If the external power interface is connected to an external power source, the external power interface is used as a power source; If the external power interface is not connected to an external power source, the power level of the power battery pack is detected; if the power level of the power battery pack is not lower than a preset power supply threshold, the power battery pack is used as a power source; if the power level of the power battery pack is lower than a preset power supply threshold, the engine range extender is used as a power source; S3, controlling the determined power source to provide power to the actuator of the rotary drilling rig power system, including: The required power of the rotary drilling rig under the walking, rotating, pulling and pressurizing conditions including the rotary drilling rig power system is defined as P 行走 , P 回转 , P 起拔 , P 加压 , where P 行走 >P 回转 >P 起拔 >P 加压 ; When it is determined that the engine range extender is the power source, the speed and power of the engine range extender are set to constant values, so that the engine range extender drives the generator to generate electricity with the corresponding constant power to provide power for the execution unit, and the constant power of the generator at this time is defined as P 发电机 ; By adjusting the speed and power of the engine range extender, P 发电机 Adjust to P 回转＜ P 发电机＜ P 行走 .

2. The rotary drilling rig control method according to claim 1, characterized in that: The step S2 further comprises: When it is determined that the external power supply interface is the power source, it is further determined whether the power provided by the external power supply through the external power supply interface is greater than the power required by the execution unit; if so, the power battery pack is charged using the remaining power portion of the power provided by the external power supply through the external power supply interface that is greater than the power required by the execution unit.

3. The rotary drilling rig control method according to claim 2, characterized in that: The step S3 further comprises: When the rotary drilling rig including the rotary drilling rig power system is in any of the three working conditions of rotation, pressurization and extraction, the power generation power P of the generator is 发电机 The excess power of the rotary drilling rig that exceeds the power consumed by the rotary drilling rig is used to charge the power battery pack; when the rotary drilling rig is in a walking condition, the power battery pack is used to provide power to supplement the power generation power P of the generator. 发电机 The difference between the power consumed by the rotary drilling rig.

4. The rotary drilling rig control method according to claim 2, characterized in that: The rotary drilling rig control method further comprises the following steps: When the rotary drilling machine including the rotary drilling machine power system is braked or decelerated, the power supply to the execution part is stopped, and the battery power part is charged by the execution part.

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