CN115142784A - Electro-hydraulic hybrid driving method and system, power head and rotary drilling rig - Google Patents
Electro-hydraulic hybrid driving method and system, power head and rotary drilling rig Download PDFInfo
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- CN115142784A CN115142784A CN202210824320.3A CN202210824320A CN115142784A CN 115142784 A CN115142784 A CN 115142784A CN 202210824320 A CN202210824320 A CN 202210824320A CN 115142784 A CN115142784 A CN 115142784A
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- 238000005553 drilling Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000005540 biological transmission Effects 0.000 claims abstract description 51
- 239000002689 soil Substances 0.000 claims abstract description 44
- 230000002708 enhancing effect Effects 0.000 claims description 14
- 230000009471 action Effects 0.000 claims description 13
- 239000003638 chemical reducing agent Substances 0.000 claims description 10
- 230000004044 response Effects 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 2
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B3/00—Rotary drilling
- E21B3/02—Surface drives for rotary drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses an electro-hydraulic hybrid driving method, an electro-hydraulic hybrid driving system, a power head and a rotary drilling rig, wherein the system comprises the following components: the motor driving unit and the hydraulic motor driving unit are respectively and mechanically connected with the power head transmission box, the motor driving unit and the motor floating control unit are connected through wires, and the hydraulic motor driving unit and the hydraulic motor floating control unit are connected through hydraulic pipelines. Generally, only the hydraulic motor drive unit is in a floating state, and the power head transmission case is independently driven by the motor drive unit; when the power head is required to output larger torque, the floating states of the two driving units are released, and a power head transmission box is compositely driven by a motor driving unit and a hydraulic motor driving unit; when the power head is required to throw soil, only the motor driving unit is in a floating state, and the power head transmission case is independently driven by the hydraulic motor driving unit. The system enables the power head to have the characteristics of high efficiency of motor driving, large torque of hybrid driving and good soil throwing performance of hydraulic driving.
Description
Technical Field
The invention belongs to the field of engineering machinery, and particularly relates to an electro-hydraulic hybrid driving method, an electro-hydraulic hybrid driving system, a power head and a rotary drilling rig.
Background
The rotary drilling rig is piling type hole forming operation equipment, and a drilling tool is driven to rotate by the rotation of a power head to perform drilling operation. The driving technology adopted by the current power head is mainly hydraulic motor driving, and the hydraulic motor driving has the advantages of small volume, high power, quick response, convenient arrangement and the like, but because the hydraulic motor has internal leakage, the higher the pressure is, the larger the leakage is, and certain power loss is caused.
Along with the progress of science and technology, the electromotion of engineering machinery is gradually raised, a motor driving mode is gradually generated on the power head in the prior art, the motor driving has the advantages of high transmission efficiency, high allowable rotating speed and the like, but the defects of low starting and stopping response speed and the like exist, the power head is required to be quickly started and stopped when the rotary drilling rig throws earth, and the defects of the motor driving are gradually exposed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an electro-hydraulic hybrid driving method, an electro-hydraulic hybrid driving system, a power head and a rotary drilling rig, so that the power head of the rotary drilling rig has the characteristics of high efficiency, large torque and good soil throwing performance.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
in a first aspect, the invention provides an electro-hydraulic hybrid driving method, which is based on an electro-hydraulic hybrid driving system, wherein the system comprises a motor driving unit, a hydraulic motor driving unit and a power head transmission case; the motor driving unit and the hydraulic motor driving unit are respectively and mechanically connected with the power head transmission case to provide driving power for the power head transmission case;
the method comprises the following steps:
when the power head is not required to output larger torque and throw soil, only the hydraulic motor driving unit is in a floating state, and the power head transmission box is independently driven by the motor driving unit;
when the power head is required to output larger torque, the floating states of the motor driving unit and the hydraulic motor driving unit are released, and the power head transmission box is driven by the motor driving unit and the hydraulic motor driving unit in a composite mode;
when the power head is required to throw soil, only the motor driving unit is in a floating state, and the power head transmission case is independently driven by the hydraulic motor driving unit.
In a second aspect, the invention provides an electro-hydraulic hybrid drive system, which comprises a motor drive unit, a hydraulic motor drive unit, a control module and a power head transmission case;
the motor driving unit and the hydraulic motor driving unit are respectively and mechanically connected with the power head transmission box to provide driving power for the power head transmission box;
the power head transmission case is used for outputting rotary power to drive the drilling tool to rotate for drilling operation;
the control module comprises a motor floating control unit and a hydraulic motor floating control unit;
the motor floating control unit is electrically connected with the motor driving unit to control whether the motor driving unit is in a floating state;
the hydraulic motor floating control unit is hydraulically connected with the hydraulic motor driving unit through a pipeline so as to control whether the hydraulic motor driving unit is in a floating state or not.
Further, the hydraulic motor driving unit comprises a motor and a speed reducer; the motor is connected with the speed reducer and the hydraulic motor floating control unit, and the speed reducer is connected with the power head transmission case.
Further, the system further comprises a torque enhancement button and a soil dumping mode button;
the torque enhancing button and the soil throwing mode button are respectively in signal connection with the motor floating control unit and the hydraulic motor floating control unit;
the torque boost button is capable of sending a torque boost signal to the control module in response to a typing action; the soil throwing mode button can respond to a keying action and send a soil throwing signal to the control module;
when the torque enhancing signal and the soil throwing signal are not received, the hydraulic motor floating control unit enables the hydraulic motor driving unit to be in a floating state, the motor floating control unit enables the motor driving unit to be in a floating state, and the power head transmission box is independently driven by the motor driving unit;
when a torque enhancement signal is received, the hydraulic motor floating control unit enables the hydraulic motor driving unit to be in a floating state, the motor floating control unit enables the motor driving unit to be in a floating state, and the power head transmission box is driven by the motor driving unit and the hydraulic motor driving unit in a combined mode;
when a soil throwing signal is received, the hydraulic motor floating control unit enables the hydraulic motor driving unit to be in a floating state, the motor floating control unit enables the motor driving unit to be in a floating state, and the power head transmission case is independently driven by the hydraulic motor driving unit.
Further, the hydraulic motor floating control unit comprises an electromagnetic valve which is respectively connected with a torque enhancing button and a soil throwing mode button; the electromagnetic valve is a two-position two-way electromagnetic valve;
the ports 1 and 2 of the electromagnetic valve are respectively connected with the ports A and B of the hydraulic motor through pipelines, when the motor drives the power head to rotate, if the torque enhancing button and the soil throwing mode button are not pressed down, the electromagnetic valve is not electrified, the cavities A and B of the motors are conducted, and the motors are in a floating state; if one of the torque enhancing button or the soil throwing mode button is pressed down, the electromagnetic valve is electrified, the two cavities of the motors A and B are not conducted, the floating state of the motors is relieved, and the motors drive the power head to rotate under the action of the working oil source.
Further, the motor driving unit includes a motor and a motor controller; the motor is connected with the power head transmission case; the motor is electrically connected with the motor controller.
Further, the motor floating control unit is connected in the motor controller, is respectively connected with the torque enhancement button and the soil throwing mode button, and is used for controlling whether the motor controller outputs current to the motor or not so as to control whether the motor floats or not;
when the soil throwing mode button is pressed down, the motor floating control unit controls the motor controller not to output current, and the motor floats; when the soil throwing mode button is not pressed down, the motor controller controls normal output current, and the motor does not float.
Further, an emergency stop module is arranged in the control module;
the emergency stop module is also connected with an emergency stop button;
the emergency stop module can respond to the key-in action of the emergency stop button, so that the control module emergently stops the hydraulic motor driving unit and the motor driving unit.
In a third aspect, the invention provides a power head comprising any one of the electro-hydraulic hybrid drive systems of the second aspect.
In a fourth aspect, the invention provides a rotary drilling rig, which comprises any one of the electro-hydraulic hybrid driving systems in the second aspect or the power head in the third aspect.
Compared with the prior art, the invention has the following beneficial effects:
1. the motor drive replaces the traditional hydraulic motor drive, and the transmission efficiency and the maximum rotating speed of the motor are higher than those of the hydraulic motor, so that the transmission efficiency and the working rotating speed of the power head can be improved.
2. When the power head is in a heavy-load working condition, the motor and the hydraulic motor can drive the power head to rotate at the same time, so that the effect of increasing the torque of the power head is achieved, and the power is stronger.
3. The quick start-stop characteristic of the hydraulic motor is utilized, so that the impact force generated when the drilling tool rotates left and right and stops is stronger, and the power head is more favorable for throwing soil.
Drawings
Fig. 1 is a schematic diagram of the framework of the present invention.
FIG. 2 is a control diagram of the operation of the present invention.
Fig. 3 is a hydraulic motor float control unit embodiment of the present invention.
In the figure: 3-1, a motor; 4-1, an electromagnetic valve; 3-2 and a speed reducer.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present embodiment, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the indicated orientation or positional relationship thereof is based on the orientation or positional relationship shown in the drawings, and is only for convenience of describing the present embodiment and simplifying the description, but does not indicate or imply that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be construed as being limited to the present embodiment.
The first embodiment is as follows:
the embodiment provides an electro-hydraulic hybrid driving method, which is based on a driving system, and the system comprises: the device comprises a motor driving unit, a motor floating control unit, a hydraulic motor driving unit, a hydraulic motor floating control unit and a power head transmission case;
the motor driving unit and the hydraulic motor driving unit are respectively and mechanically connected with the power head transmission box, the motor driving unit and the motor floating control unit are connected through a wire, and the hydraulic motor driving unit and the hydraulic motor floating control unit are connected through a hydraulic pipeline.
An electro-hydraulic hybrid driving method of the present embodiment, as shown in fig. 2, includes:
normally, only the hydraulic motor drive unit is in a floating state, and the power head transmission case is independently driven by the motor drive unit;
when the power head is required to output larger torque, the floating states of the two driving units are released, and a power head transmission box is compositely driven by a motor driving unit and a hydraulic motor driving unit;
when the power head is required to throw soil, only the motor driving unit is in a floating state, and the power head transmission case is independently driven by the hydraulic motor driving unit.
Example two:
the embodiment provides an electro-hydraulic hybrid drive system, as shown in fig. 1, the system includes a motor drive unit, a hydraulic motor drive unit, a control module and a power head transmission case;
the motor driving unit and the hydraulic motor driving unit are respectively and mechanically connected with the power head transmission case to provide driving power for the power head transmission case;
the power head transmission case is used for outputting rotary power to drive the drilling tool to rotate for drilling operation;
the control module comprises a motor floating control unit and a hydraulic motor floating control unit;
the motor floating control unit is electrically connected with the motor driving unit to control whether the motor driving unit is in a floating state;
the hydraulic motor floating control unit is hydraulically connected with the hydraulic motor driving unit through a pipeline to control whether the hydraulic motor driving unit is in a floating state.
Specifically, the hydraulic motor driving unit comprises a motor 3-1 and a speed reducer 3-2; the motor 3-1 is connected with the speed reducer 3-2 and the hydraulic motor floating control unit, and the speed reducer 3-2 is connected with the power head transmission box.
Specifically, the system further comprises a torque enhancement button and a soil throwing mode button; the torque boost button and the earth-throwing mode button can only be pressed one at a time.
The torque enhancing button and the soil throwing mode button are respectively in signal connection with the motor floating control unit and the hydraulic motor floating control unit;
the torque boost button is capable of sending a torque boost signal to the control module in response to a typing action; the soil throwing mode button can respond to a keying action and send a soil throwing signal to the control module;
as shown in fig. 2:
when the torque enhancing signal and the soil throwing signal are not received, the hydraulic motor floating control unit enables the driving unit of the hydraulic motor 3-1 to be in a floating state, the motor floating control unit enables the motor driving unit to be in a floating state, and the power head transmission box is independently driven by the motor driving unit;
when a torque enhancement signal is received, the hydraulic motor floating control unit enables the hydraulic motor driving unit to be in a floating state, the motor floating control unit enables the motor driving unit to be in a floating state, and the power head transmission box is driven by the motor driving unit and the hydraulic motor driving unit in a combined mode;
when a soil throwing signal is received, the hydraulic motor floating control unit enables the hydraulic motor driving unit to be in a floating state, the motor floating control unit enables the motor driving unit to be in a floating state, and the power head transmission case is independently driven by the hydraulic motor driving unit.
Specifically, the hydraulic motor floating control unit comprises an electromagnetic valve 4-1 which is respectively connected with a torque enhancing button and a soil throwing mode button; the electromagnetic valve 4-1 is a two-position two-way electromagnetic valve;
FIG. 3 is an embodiment of a hydraulic motor floating control unit, wherein ports 1 and 2 of an electromagnetic valve 4-1 are respectively connected with ports A and B of a hydraulic motor 3-1 through pipelines, when a motor drives a power head to rotate, if a torque enhancement button and a soil throwing mode button are not pressed down, the electromagnetic valve 4-1 is not electrified, two cavities A and B of the motor 3-1 are conducted, and the motor 3-1 is in a floating state; if one of the torque enhancing button or the soil throwing mode button is pressed down, the electromagnetic valve 4-1 is electrified, the cavities A and B of the motor 3-1 are not conducted, the floating state of the motor 3-1 is relieved, and the motor 3-1 drives the power head to rotate under the action of the working oil source.
Ports 1 and 2 of the electromagnetic valve 4-1 are respectively connected with ports A and B of the hydraulic motor through pipelines, when the electromagnetic valve 4-1 is not electrified in the process of driving the power head to rotate by the motor, the cavities A and B of the motor 3-1 are conducted, and the motor 3-1 is in a floating state; when the electromagnetic valve 4-1 is electrified, the cavities A and B of the motor 3-1 are not conducted, the floating state of the motor 3-1 is relieved, and the motor 3-1 drives the power head to rotate under the action of the working oil source.
Specifically, the motor driving unit comprises a motor and a motor controller; the motor is connected with a power head transmission case; the motor is electrically connected with the motor controller.
Specifically, the motor floating control unit is connected in the motor controller, is respectively connected with the torque enhancing button and the soil throwing mode button, and is used for controlling whether the motor controller outputs current to the motor or not so as to control whether the motor floats or not;
when the soil throwing mode button is pressed down, the motor floating control unit controls the motor controller not to output current, and the motor floats; when the soil throwing mode button is not pressed down, the motor controller controls normal output current, and the motor does not float.
In addition, in order to protect the safety of the driving unit, an emergency stop module is also arranged in the control module; the emergency stop module is also connected with an emergency stop button; the emergency stop module can respond to the key-in action of the emergency stop button, so that the control module emergently stops the hydraulic motor driving unit and the motor driving unit.
When an emergency occurs, an operator can press the emergency stop button to stop the whole machine, so that accidents are prevented.
Example three:
the embodiment provides a power head, which comprises the electro-hydraulic hybrid drive system of the second embodiment.
Example four:
the embodiment provides a rotary drilling rig, which comprises any one of the electro-hydraulic hybrid driving systems or the power head in the third embodiment.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of the invention, "plurality" means two or more unless explicitly specifically defined otherwise.
In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.
In the description herein, reference to the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (10)
1. The electro-hydraulic hybrid driving method is characterized in that the method is based on an electro-hydraulic hybrid driving system, and the system comprises a motor driving unit, a hydraulic motor driving unit and a power head transmission case; the motor driving unit and the hydraulic motor driving unit are respectively and mechanically connected with the power head transmission case to provide driving power for the power head transmission case;
the method comprises the following steps:
when the power head is not required to output larger torque and throw soil, only the hydraulic motor driving unit is in a floating state, and the power head transmission box is independently driven by the motor driving unit;
when the power head is required to output larger torque, the floating states of the motor driving unit and the hydraulic motor driving unit are all released, and the power head transmission box is driven by the motor driving unit and the hydraulic motor driving unit in a composite mode;
when the power head is required to throw soil, only the motor driving unit is in a floating state, and the power head transmission case is independently driven by the hydraulic motor driving unit.
2. The electro-hydraulic hybrid driving system is characterized by comprising a motor driving unit, a hydraulic motor driving unit, a control module and a power head transmission case;
the motor driving unit and the hydraulic motor driving unit are respectively and mechanically connected with the power head transmission case to provide driving power for the power head transmission case;
the power head transmission case is used for outputting rotary power to drive the drilling tool to rotate for drilling operation;
the control module comprises a motor floating control unit and a hydraulic motor floating control unit;
the motor floating control unit is electrically connected with the motor driving unit to control whether the motor driving unit is in a floating state;
the hydraulic motor floating control unit is hydraulically connected with the hydraulic motor driving unit through a pipeline so as to control whether the hydraulic motor driving unit is in a floating state or not.
3. The electro-hydraulic hybrid drive system of claim 2, wherein the hydraulic motor drive unit includes a motor and a speed reducer; the motor is connected with the speed reducer and the hydraulic motor floating control unit, and the speed reducer is connected with the power head transmission case.
4. The electro-hydraulic hybrid drive system of claim 2, further comprising a torque boost button and a soil dump mode button;
the torque enhancing button and the soil throwing mode button are respectively in signal connection with the motor floating control unit and the hydraulic motor floating control unit;
the torque boost button is capable of sending a torque boost signal to the control module in response to a typing action; the soil throwing mode button can respond to a keying action and send a soil throwing signal to the control module;
when the torque enhancing signal and the soil throwing signal are not received, the hydraulic motor floating control unit enables the hydraulic motor driving unit to be in a floating state, the motor floating control unit enables the motor driving unit to be in a floating state, and the power head transmission box is independently driven by the motor driving unit;
when a torque enhancement signal is received, the hydraulic motor floating control unit enables the hydraulic motor driving unit to be in a floating state, the motor floating control unit enables the motor driving unit to be in a floating state, and the power head transmission box is driven by the motor driving unit and the hydraulic motor driving unit in a combined mode;
when a soil throwing signal is received, the hydraulic motor floating control unit enables the hydraulic motor driving unit to be in a floating state, the motor floating control unit enables the motor driving unit to be in a floating state, and the power head transmission case is independently driven by the hydraulic motor driving unit.
5. The electro-hydraulic hybrid drive system of claim 4, wherein the hydraulic motor float control unit comprises solenoid valves connected to a torque boost button and a soil dump mode button, respectively; the electromagnetic valve is a two-position two-way electromagnetic valve;
the ports 1 and 2 of the electromagnetic valve are respectively connected with the ports A and B of the hydraulic motor through pipelines, when the motor drives the power head to rotate, if the torque enhancing button and the soil throwing mode button are not pressed down, the electromagnetic valve is not electrified, the cavities A and B of the motors are conducted, and the motors are in a floating state; if one of the torque enhancing button or the soil throwing mode button is pressed down, the electromagnetic valve is electrified, the two cavities of the motors A and B are not conducted, the floating state of the motors is relieved, and the motors drive the power head to rotate under the action of the working oil source.
6. The electro-hydraulic hybrid drive system of claim 2, wherein the motor drive unit includes a motor and a motor controller; the motor is connected with the power head transmission case; the motor is electrically connected with the motor controller.
7. The electro-hydraulic hybrid driving system according to claim 6, wherein the motor floating control unit is connected with the motor controller, and is respectively connected with the earth throwing mode button for controlling whether the motor controller outputs current to the motor so as to control whether the motor floats;
when the soil throwing mode button is pressed down, the motor floating control unit controls the motor controller not to output current, and the motor floats; when the soil throwing mode button is not pressed down, the motor controller controls normal output current, and the motor does not float.
8. The electro-hydraulic hybrid drive system as claimed in claim 2, wherein an emergency stop module is further provided in the control module;
the emergency stop module is also connected with an emergency stop button;
the emergency stop module can respond to the keying action of the emergency stop button to enable the control module to emergently stop the hydraulic motor driving unit and the motor driving unit.
9. A power head comprising an electro-hydraulic hybrid drive system according to any one of claims 2 to 8.
10. A rotary drilling rig comprising an electro-hydraulic hybrid drive system according to any one of claims 2 to 8 or a power head according to any one of claims 2 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210824320.3A CN115142784A (en) | 2022-07-14 | 2022-07-14 | Electro-hydraulic hybrid driving method and system, power head and rotary drilling rig |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210824320.3A CN115142784A (en) | 2022-07-14 | 2022-07-14 | Electro-hydraulic hybrid driving method and system, power head and rotary drilling rig |
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| Publication Number | Publication Date |
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| CN115142784A true CN115142784A (en) | 2022-10-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210824320.3A Pending CN115142784A (en) | 2022-07-14 | 2022-07-14 | Electro-hydraulic hybrid driving method and system, power head and rotary drilling rig |
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| Country | Link |
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| CN (1) | CN115142784A (en) |
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- 2022-07-14 CN CN202210824320.3A patent/CN115142784A/en active Pending
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